2021-08-08 08:41:30 +00:00
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.\" Copyright (c) 2021 by Christian Brauner <christian.brauner@ubuntu.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.TH MOUNT_SETATTR 2 2021-03-22 "Linux" "Linux Programmer's Manual"
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.SH NAME
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2021-08-10 19:54:42 +00:00
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mount_setattr \- change properties of a mount or mount tree
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2021-08-08 08:41:30 +00:00
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.SH SYNOPSIS
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.nf
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.PP
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.BR "#include <linux/fcntl.h>" " /* Definition of " AT_* " constants */"
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
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.BR "#include <linux/mount.h>" " /* Definition of " MOUNT_ATTR_* " constants */"
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2021-08-08 08:41:30 +00:00
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.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */"
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.B #include <unistd.h>
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.PP
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2021-08-12 01:27:01 +00:00
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.BI "int syscall(SYS_mount_setattr, int " dirfd ", const char *" pathname ,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
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.BI " unsigned int " flags ", struct mount_attr *" attr \
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", size_t " size );
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2021-08-08 08:41:30 +00:00
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.fi
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.PP
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.IR Note :
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glibc provides no wrapper for
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.BR mount_setattr (),
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necessitating the use of
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.BR syscall (2).
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.SH DESCRIPTION
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The
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
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.BR mount_setattr ()
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2021-08-09 04:48:14 +00:00
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system call changes the mount properties of a mount or an entire mount tree.
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2021-08-08 08:41:30 +00:00
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If
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2021-08-12 01:27:01 +00:00
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.I pathname
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2021-08-08 08:41:30 +00:00
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is a relative pathname,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
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then it is interpreted relative to
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the directory referred to by the file descriptor
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2021-08-09 21:29:42 +00:00
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.IR dirfd .
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2021-08-08 08:41:30 +00:00
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If
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2021-08-09 21:29:42 +00:00
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.I dirfd
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2021-08-08 08:41:30 +00:00
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is the special value
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2021-08-09 04:48:14 +00:00
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.BR AT_FDCWD ,
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2021-08-08 08:41:30 +00:00
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then
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2021-08-12 01:27:01 +00:00
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.I pathname
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
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is interpreted relative to
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the current working directory of the calling process.
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2021-08-08 08:41:30 +00:00
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If
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2021-08-12 01:27:01 +00:00
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.I pathname
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2021-08-08 08:41:30 +00:00
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is the empty string and
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
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.B AT_EMPTY_PATH
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2021-08-08 08:41:30 +00:00
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is specified in
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
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|
.IR flags ,
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2021-08-08 08:41:30 +00:00
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then the mount properties of the mount identified by
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2021-08-09 21:29:42 +00:00
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.I dirfd
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2021-08-08 08:41:30 +00:00
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are changed.
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2021-08-12 03:01:00 +00:00
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(See
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.BR openat (2)
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for an explanation of why the
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.I dirfd
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argument is useful.)
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2021-08-08 08:41:30 +00:00
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.PP
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|
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|
The
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR mount_setattr ()
|
2021-08-08 08:41:30 +00:00
|
|
|
system call uses an extensible structure
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.RI ( "struct mount_attr" )
|
2021-08-08 08:41:30 +00:00
|
|
|
to allow for future extensions.
|
|
|
|
Any non-flag extensions to
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR mount_setattr ()
|
2021-08-09 04:48:14 +00:00
|
|
|
will be implemented as new fields appended to the this structure,
|
2021-08-08 08:41:30 +00:00
|
|
|
with a zero value in a new field resulting in the kernel behaving
|
|
|
|
as though that extension field was not present.
|
|
|
|
Therefore,
|
|
|
|
the caller
|
|
|
|
.I must
|
|
|
|
zero-fill this structure on initialization.
|
2021-08-09 04:48:14 +00:00
|
|
|
See the "Extensibility" subsection under
|
2021-08-08 08:41:30 +00:00
|
|
|
.B NOTES
|
|
|
|
for more details.
|
|
|
|
.PP
|
|
|
|
The
|
|
|
|
.I size
|
|
|
|
argument should usually be specified as
|
|
|
|
.IR "sizeof(struct mount_attr)" .
|
2021-08-10 19:54:42 +00:00
|
|
|
However, if the caller is using a kernel that supports an extended
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR "struct mount_attr" ,
|
2021-08-10 19:54:42 +00:00
|
|
|
but the caller does not intend to make use of these features,
|
2021-08-10 22:28:43 +00:00
|
|
|
it is possible to pass the size of an earlier
|
2021-08-10 19:54:42 +00:00
|
|
|
version of the structure together with the extended structure.
|
2021-08-10 22:28:43 +00:00
|
|
|
This allows the kernel to not copy later parts of the structure
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
that aren't used anyway.
|
2021-08-08 08:41:30 +00:00
|
|
|
With each extension that changes the size of
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR "struct mount_attr" ,
|
|
|
|
the kernel will expose a definition of the form
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BI MOUNT_ATTR_SIZE_VER number\c
|
|
|
|
\&.
|
2021-08-09 04:48:14 +00:00
|
|
|
For example, the macro for the size of the initial version of
|
2021-08-08 08:41:30 +00:00
|
|
|
.I struct mount_attr
|
|
|
|
is
|
|
|
|
.BR MOUNT_ATTR_SIZE_VER0 .
|
|
|
|
.PP
|
|
|
|
The
|
|
|
|
.I flags
|
2021-08-12 01:27:01 +00:00
|
|
|
argument can be used to alter the pathname resolution behavior.
|
2021-08-08 08:41:30 +00:00
|
|
|
The supported values are:
|
|
|
|
.TP
|
|
|
|
.B AT_EMPTY_PATH
|
|
|
|
If
|
2021-08-12 01:27:01 +00:00
|
|
|
.I pathname
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
is the empty string,
|
|
|
|
change the mount properties on
|
2021-08-09 21:29:42 +00:00
|
|
|
.I dirfd
|
2021-08-08 08:41:30 +00:00
|
|
|
itself.
|
|
|
|
.TP
|
|
|
|
.B AT_RECURSIVE
|
|
|
|
Change the mount properties of the entire mount tree.
|
|
|
|
.TP
|
|
|
|
.B AT_SYMLINK_NOFOLLOW
|
2021-08-09 04:48:14 +00:00
|
|
|
Don't follow trailing symbolic links.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B AT_NO_AUTOMOUNT
|
|
|
|
Don't trigger automounts.
|
|
|
|
.PP
|
|
|
|
The
|
|
|
|
.I attr
|
|
|
|
argument of
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR mount_setattr ()
|
2021-08-08 08:41:30 +00:00
|
|
|
is a structure of the following form:
|
|
|
|
.PP
|
|
|
|
.in +4n
|
|
|
|
.EX
|
|
|
|
struct mount_attr {
|
2021-08-09 04:48:14 +00:00
|
|
|
__u64 attr_set; /* Mount properties to set */
|
|
|
|
__u64 attr_clr; /* Mount properties to clear */
|
|
|
|
__u64 propagation; /* Mount propagation type */
|
|
|
|
__u64 userns_fd; /* User namespace file descriptor */
|
2021-08-08 08:41:30 +00:00
|
|
|
};
|
|
|
|
.EE
|
|
|
|
.in
|
|
|
|
.PP
|
|
|
|
The
|
|
|
|
.I attr_set
|
|
|
|
and
|
|
|
|
.I attr_clr
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
members are used to specify the mount properties that
|
|
|
|
are supposed to be set or cleared for a mount or mount tree.
|
2021-08-08 08:41:30 +00:00
|
|
|
Flags set in
|
|
|
|
.I attr_set
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
enable a property on a mount or mount tree,
|
|
|
|
and flags set in
|
2021-08-08 08:41:30 +00:00
|
|
|
.I attr_clr
|
|
|
|
remove a property from a mount or mount tree.
|
|
|
|
.PP
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
When changing mount properties,
|
|
|
|
the kernel will first clear the flags specified
|
2021-08-08 08:41:30 +00:00
|
|
|
in the
|
|
|
|
.I attr_clr
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
field,
|
|
|
|
and then set the flags specified in the
|
2021-08-08 08:41:30 +00:00
|
|
|
.I attr_set
|
2021-08-10 19:54:42 +00:00
|
|
|
field.
|
|
|
|
For example, these settings:
|
2021-08-08 08:41:30 +00:00
|
|
|
.PP
|
|
|
|
.in +4n
|
|
|
|
.EX
|
|
|
|
struct mount_attr attr = {
|
|
|
|
.attr_clr = MOUNT_ATTR_NOEXEC | MOUNT_ATTR_NODEV,
|
|
|
|
.attr_set = MOUNT_ATTR_RDONLY | MOUNT_ATTR_NOSUID,
|
|
|
|
};
|
2021-08-10 19:54:42 +00:00
|
|
|
.EE
|
|
|
|
.in
|
|
|
|
.PP
|
|
|
|
are equivalent to the following steps:
|
|
|
|
.PP
|
|
|
|
.in +4n
|
|
|
|
.EX
|
2021-08-08 08:41:30 +00:00
|
|
|
unsigned int current_mnt_flags = mnt->mnt_flags;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Clear all flags set in .attr_clr,
|
|
|
|
* clearing MOUNT_ATTR_NOEXEC and MOUNT_ATTR_NODEV.
|
|
|
|
*/
|
|
|
|
current_mnt_flags &= ~attr->attr_clr;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now set all flags set in .attr_set,
|
|
|
|
* applying MOUNT_ATTR_RDONLY and MOUNT_ATTR_NOSUID.
|
|
|
|
*/
|
|
|
|
current_mnt_flags |= attr->attr_set;
|
|
|
|
|
|
|
|
mnt->mnt_flags = current_mnt_flags;
|
|
|
|
.EE
|
|
|
|
.in
|
|
|
|
.PP
|
2021-08-10 19:54:42 +00:00
|
|
|
As a result of this change, the mount or mount tree (a) is read-only;
|
2021-08-09 04:48:14 +00:00
|
|
|
(b) blocks the execution of set-user-ID and set-group-ID programs;
|
|
|
|
(c) allows execution of programs; and (d) allows access to devices.
|
|
|
|
.PP
|
2021-08-08 08:41:30 +00:00
|
|
|
Multiple changes with the same set of flags requested
|
|
|
|
in
|
|
|
|
.I attr_clr
|
|
|
|
and
|
|
|
|
.I attr_set
|
|
|
|
are guaranteed to be idempotent after the changes have been applied.
|
|
|
|
.PP
|
|
|
|
The following mount attributes can be specified in the
|
|
|
|
.I attr_set
|
|
|
|
or
|
|
|
|
.I attr_clr
|
|
|
|
fields:
|
|
|
|
.TP
|
|
|
|
.B MOUNT_ATTR_RDONLY
|
|
|
|
If set in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR attr_set ,
|
|
|
|
makes the mount read-only.
|
|
|
|
If set in
|
|
|
|
.IR attr_clr ,
|
2021-08-08 08:41:30 +00:00
|
|
|
removes the read-only setting if set on the mount.
|
|
|
|
.TP
|
|
|
|
.B MOUNT_ATTR_NOSUID
|
|
|
|
If set in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR attr_set ,
|
|
|
|
causes the mount not to honor the set-user-ID and set-group-ID mode bits and
|
|
|
|
file capabilities when executing programs.
|
2021-08-08 08:41:30 +00:00
|
|
|
If set in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR attr_clr ,
|
2021-08-08 08:41:30 +00:00
|
|
|
clears the set-user-ID, set-group-ID,
|
|
|
|
and file capability restriction if set on this mount.
|
|
|
|
.TP
|
|
|
|
.B MOUNT_ATTR_NODEV
|
|
|
|
If set in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR attr_set ,
|
|
|
|
prevents access to devices on this mount.
|
|
|
|
If set in
|
|
|
|
.IR attr_clr ,
|
|
|
|
removes the restriction that prevented accessing devices on this mount.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_NOEXEC
|
2021-08-08 08:41:30 +00:00
|
|
|
If set in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR attr_set ,
|
|
|
|
prevents executing programs on this mount.
|
|
|
|
If set in
|
|
|
|
.IR attr_clr ,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
removes the restriction that prevented executing programs on this mount.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_NOSYMFOLLOW
|
2021-08-08 08:41:30 +00:00
|
|
|
If set in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR attr_set ,
|
|
|
|
prevents following symbolic links on this mount.
|
|
|
|
If set in
|
|
|
|
.IR attr_clr ,
|
|
|
|
removes the restriction that prevented following symbolic links on this mount.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B MOUNT_ATTR_NODIRATIME
|
|
|
|
If set in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR attr_set ,
|
|
|
|
prevents updating access time for directories on this mount.
|
|
|
|
If set in
|
|
|
|
.IR attr_clr ,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
removes the restriction that prevented updating access time for directories.
|
2021-08-08 08:41:30 +00:00
|
|
|
Note that
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_NODIRATIME
|
2021-08-09 04:48:14 +00:00
|
|
|
can be combined with other access-time settings
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
and is implied by the noatime setting.
|
2021-08-09 04:48:14 +00:00
|
|
|
All other access-time settings are mutually exclusive.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
2021-08-09 04:48:14 +00:00
|
|
|
.BR MOUNT_ATTR__ATIME " - changing access-time settings"
|
2021-08-10 08:41:05 +00:00
|
|
|
The access-time values listed below are an enumeration that
|
|
|
|
includes the value zero, expressed in the bits defined by the mask
|
|
|
|
.BR MOUNT_ATTR__ATIME .
|
|
|
|
Even though these bits are an enumeration
|
|
|
|
(in contrast to the other mount flags such as
|
2021-08-09 04:48:14 +00:00
|
|
|
.BR MOUNT_ATTR_NOEXEC ),
|
2021-08-08 08:41:30 +00:00
|
|
|
they are nonetheless passed in
|
|
|
|
.I attr_set
|
|
|
|
and
|
|
|
|
.I attr_clr
|
|
|
|
for consistency with
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR fsmount (2),
|
2021-08-08 08:41:30 +00:00
|
|
|
which introduced this behavior.
|
|
|
|
.IP
|
2021-08-09 04:48:14 +00:00
|
|
|
Note that,
|
2021-08-10 08:41:05 +00:00
|
|
|
since the access-time values are an enumeration rather than bit values,
|
|
|
|
a caller wanting to transition to a different access-time setting
|
|
|
|
cannot simply specify the access-time setting in
|
|
|
|
.IR attr_set ,
|
|
|
|
but must also include
|
2021-08-08 08:41:30 +00:00
|
|
|
.B MOUNT_ATTR__ATIME
|
|
|
|
in the
|
|
|
|
.I attr_clr
|
|
|
|
field.
|
|
|
|
The kernel will verify that
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR__ATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
isn't partially set in
|
2021-08-10 08:41:05 +00:00
|
|
|
.IR attr_clr
|
|
|
|
(i.e., either all bits in the
|
|
|
|
.B MOUNT_ATTR__ATIME
|
|
|
|
bit field are either set or clear), and that
|
2021-08-08 08:41:30 +00:00
|
|
|
.I attr_set
|
2021-08-09 04:48:14 +00:00
|
|
|
doesn't have any access-time bits set if
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR__ATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
isn't set in
|
|
|
|
.IR attr_clr .
|
|
|
|
.RS
|
|
|
|
.TP
|
|
|
|
.B MOUNT_ATTR_RELATIME
|
|
|
|
When a file is accessed via this mount,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
update the file's last access time (atime)
|
|
|
|
only if the current value of atime is less than or equal to
|
|
|
|
the file's last modification time (mtime) or last status change time (ctime).
|
2021-08-08 08:41:30 +00:00
|
|
|
.IP
|
2021-08-09 04:48:14 +00:00
|
|
|
To enable this access-time setting on a mount or mount tree,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_RELATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
must be set in
|
|
|
|
.I attr_set
|
|
|
|
and
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR__ATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
must be set in the
|
|
|
|
.I attr_clr
|
|
|
|
field.
|
|
|
|
.TP
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_NOATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
Do not update access times for (all types of) files on this mount.
|
|
|
|
.IP
|
2021-08-09 04:48:14 +00:00
|
|
|
To enable this access-time setting on a mount or mount tree,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_NOATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
must be set in
|
|
|
|
.I attr_set
|
|
|
|
and
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR__ATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
must be set in the
|
|
|
|
.I attr_clr
|
|
|
|
field.
|
|
|
|
.TP
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_STRICTATIME
|
|
|
|
Always update the last access time (atime)
|
|
|
|
when files are accessed on this mount.
|
2021-08-08 08:41:30 +00:00
|
|
|
.IP
|
2021-08-09 04:48:14 +00:00
|
|
|
To enable this access-time setting on a mount or mount tree,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_STRICTATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
must be set in
|
|
|
|
.I attr_set
|
|
|
|
and
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR__ATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
must be set in the
|
|
|
|
.I attr_clr
|
|
|
|
field.
|
|
|
|
.RE
|
|
|
|
.TP
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_IDMAP
|
2021-08-08 08:41:30 +00:00
|
|
|
If set in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR attr_set ,
|
2021-08-09 04:40:41 +00:00
|
|
|
creates an ID-mapped mount.
|
2021-08-09 04:48:14 +00:00
|
|
|
The ID mapping is taken from the user namespace specified in
|
|
|
|
.I userns_fd
|
|
|
|
and attached to the mount.
|
|
|
|
.IP
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
Since it is not supported to
|
2021-08-09 04:40:41 +00:00
|
|
|
change the ID mapping of a mount after it has been ID mapped,
|
2021-08-08 08:41:30 +00:00
|
|
|
it is invalid to specify
|
|
|
|
.B MOUNT_ATTR_IDMAP
|
|
|
|
in
|
|
|
|
.IR attr_clr .
|
|
|
|
.IP
|
2021-08-10 00:08:49 +00:00
|
|
|
For further details, see the subsection "ID-mapped mounts" under NOTES.
|
2021-08-08 08:41:30 +00:00
|
|
|
.PP
|
|
|
|
The
|
|
|
|
.I propagation
|
|
|
|
field is used to specify the propagation type of the mount or mount tree.
|
2021-08-10 07:13:56 +00:00
|
|
|
This field either has the value zero,
|
|
|
|
meaning leave the propagation type unchanged, or it has one of
|
|
|
|
the following values:
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B MS_PRIVATE
|
|
|
|
Turn all mounts into private mounts.
|
|
|
|
.TP
|
|
|
|
.B MS_SHARED
|
|
|
|
Turn all mounts into shared mounts.
|
|
|
|
.TP
|
|
|
|
.B MS_SLAVE
|
|
|
|
Turn all mounts into dependent mounts.
|
|
|
|
.TP
|
|
|
|
.B MS_UNBINDABLE
|
2021-08-10 07:23:08 +00:00
|
|
|
Turn all mounts into unbindable mounts.
|
2021-08-09 23:58:21 +00:00
|
|
|
.PP
|
2021-08-10 07:23:08 +00:00
|
|
|
For further details on the above propagation types, see
|
2021-08-09 23:58:21 +00:00
|
|
|
.BR mount_namespaces (7).
|
2021-08-08 08:41:30 +00:00
|
|
|
.SH RETURN VALUE
|
|
|
|
On success,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR mount_setattr ()
|
2021-08-08 08:41:30 +00:00
|
|
|
returns zero.
|
|
|
|
On error,
|
|
|
|
\-1 is returned and
|
|
|
|
.I errno
|
|
|
|
is set to indicate the cause of the error.
|
|
|
|
.SH ERRORS
|
|
|
|
.TP
|
|
|
|
.B EBADF
|
access.2, chmod.2, chown.2, execveat.2, futimesat.2, link.2, mkdir.2, mknod.2, mount_setattr.2, open.2, open_by_handle_at.2, readlink.2, rename.2, stat.2, statx.2, symlink.2, unlink.2, utimensat.2, mkfifo.3, scandir.3: Fix EBADF error description
Make the description of the EBADF error for invalid 'dirfd' more
uniform. In particular, note that the error only occurs when the
pathname is relative, and that it occurs when the 'dirfd' is
neither valid *nor* has the value AT_FDCWD.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-12 02:05:59 +00:00
|
|
|
.I pathname
|
|
|
|
is relative but
|
2021-08-09 21:29:42 +00:00
|
|
|
.I dirfd
|
access.2, chmod.2, chown.2, execveat.2, futimesat.2, link.2, mkdir.2, mknod.2, mount_setattr.2, open.2, open_by_handle_at.2, readlink.2, rename.2, stat.2, statx.2, symlink.2, unlink.2, utimensat.2, mkfifo.3, scandir.3: Fix EBADF error description
Make the description of the EBADF error for invalid 'dirfd' more
uniform. In particular, note that the error only occurs when the
pathname is relative, and that it occurs when the 'dirfd' is
neither valid *nor* has the value AT_FDCWD.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-12 02:05:59 +00:00
|
|
|
is neither
|
|
|
|
.B AT_FDCWD
|
|
|
|
nor a valid file descriptor.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B EBADF
|
|
|
|
.I userns_fd
|
|
|
|
is not a valid file descriptor.
|
|
|
|
.TP
|
|
|
|
.B EBUSY
|
|
|
|
The caller tried to change the mount to
|
2021-08-09 04:48:14 +00:00
|
|
|
.BR MOUNT_ATTR_RDONLY ,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
but the mount still holds files open for writing.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B EINVAL
|
2021-08-12 01:27:01 +00:00
|
|
|
The pathname specified via the
|
2021-08-09 21:29:42 +00:00
|
|
|
.I dirfd
|
2021-08-08 08:41:30 +00:00
|
|
|
and
|
2021-08-12 01:27:01 +00:00
|
|
|
.I pathname
|
2021-08-08 08:41:30 +00:00
|
|
|
arguments to
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR mount_setattr ()
|
2021-08-09 04:48:14 +00:00
|
|
|
isn't a mount point.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B EINVAL
|
|
|
|
An unsupported value was set in
|
2021-08-10 22:28:43 +00:00
|
|
|
.IR flags .
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B EINVAL
|
|
|
|
An unsupported value was specified in the
|
|
|
|
.I attr_set
|
|
|
|
field of
|
|
|
|
.IR mount_attr .
|
|
|
|
.TP
|
|
|
|
.B EINVAL
|
|
|
|
An unsupported value was specified in the
|
|
|
|
.I attr_clr
|
|
|
|
field of
|
|
|
|
.IR mount_attr .
|
|
|
|
.TP
|
|
|
|
.B EINVAL
|
|
|
|
An unsupported value was specified in the
|
|
|
|
.I propagation
|
|
|
|
field of
|
|
|
|
.IR mount_attr .
|
|
|
|
.TP
|
|
|
|
.B EINVAL
|
|
|
|
More than one of
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR MS_SHARED ,
|
|
|
|
.BR MS_SLAVE ,
|
|
|
|
.BR MS_PRIVATE ,
|
2021-08-08 08:41:30 +00:00
|
|
|
or
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MS_UNBINDABLE
|
2021-08-09 20:56:47 +00:00
|
|
|
was set in the
|
2021-08-08 08:41:30 +00:00
|
|
|
.I propagation
|
|
|
|
field of
|
|
|
|
.IR mount_attr .
|
|
|
|
.TP
|
|
|
|
.B EINVAL
|
2021-08-09 04:48:14 +00:00
|
|
|
An access-time setting was specified in the
|
2021-08-08 08:41:30 +00:00
|
|
|
.I attr_set
|
|
|
|
field without
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR__ATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
being set in the
|
|
|
|
.I attr_clr
|
|
|
|
field.
|
|
|
|
.TP
|
|
|
|
.B EINVAL
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_IDMAP
|
2021-08-08 08:41:30 +00:00
|
|
|
was specified in
|
|
|
|
.IR attr_clr .
|
|
|
|
.TP
|
|
|
|
.B EINVAL
|
|
|
|
A file descriptor value was specified in
|
|
|
|
.I userns_fd
|
|
|
|
which exceeds
|
|
|
|
.BR INT_MAX .
|
|
|
|
.TP
|
|
|
|
.B EINVAL
|
|
|
|
A valid file descriptor value was specified in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR userns_fd ,
|
2021-08-10 19:54:42 +00:00
|
|
|
but the file descriptor did not refer to a user namespace.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B EINVAL
|
2021-08-09 04:40:41 +00:00
|
|
|
The underlying filesystem does not support ID-mapped mounts.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B EINVAL
|
2021-08-10 19:54:42 +00:00
|
|
|
The mount that is to be ID mapped is not a detached mount;
|
2021-08-09 04:48:14 +00:00
|
|
|
that is, the mount is already visible in the filesystem.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B EINVAL
|
2021-08-09 04:48:14 +00:00
|
|
|
A partial access-time setting was specified in
|
2021-08-08 08:41:30 +00:00
|
|
|
.I attr_clr
|
|
|
|
instead of
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR__ATIME
|
2021-08-08 08:41:30 +00:00
|
|
|
being set.
|
|
|
|
.TP
|
|
|
|
.B EINVAL
|
|
|
|
The mount is located outside the caller's mount namespace.
|
|
|
|
.TP
|
|
|
|
.B EINVAL
|
|
|
|
The underlying filesystem is mounted in a user namespace.
|
|
|
|
.TP
|
|
|
|
.B ENOENT
|
|
|
|
A pathname was empty or had a nonexistent component.
|
|
|
|
.TP
|
|
|
|
.B ENOMEM
|
|
|
|
When changing mount propagation to
|
2021-08-09 04:48:14 +00:00
|
|
|
.BR MS_SHARED ,
|
|
|
|
a new peer group ID needs to be allocated for all mounts without a peer group
|
|
|
|
ID set.
|
|
|
|
Allocation of this peer group ID has failed.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B ENOSPC
|
|
|
|
When changing mount propagation to
|
2021-08-09 04:48:14 +00:00
|
|
|
.BR MS_SHARED ,
|
|
|
|
a new peer group ID needs to be allocated for all mounts without a peer group
|
|
|
|
ID set.
|
|
|
|
Allocation of this peer group ID can fail.
|
2021-08-08 08:41:30 +00:00
|
|
|
Note that technically further error codes are possible that are specific to the
|
2021-08-09 04:48:14 +00:00
|
|
|
ID allocation implementation used.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B EPERM
|
|
|
|
One of the mounts had at least one of
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR MOUNT_ATTR_NOATIME ,
|
|
|
|
.BR MOUNT_ATTR_NODEV ,
|
|
|
|
.BR MOUNT_ATTR_NODIRATIME ,
|
|
|
|
.BR MOUNT_ATTR_NOEXEC ,
|
|
|
|
.BR MOUNT_ATTR_NOSUID ,
|
2021-08-08 08:41:30 +00:00
|
|
|
or
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B MOUNT_ATTR_RDONLY
|
2021-08-08 08:41:30 +00:00
|
|
|
set and the flag is locked.
|
|
|
|
Mount attributes become locked on a mount if:
|
|
|
|
.RS
|
2021-08-09 04:33:03 +00:00
|
|
|
.IP \(bu 3
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
A new mount or mount tree is created causing mount propagation across user
|
2021-08-08 08:41:30 +00:00
|
|
|
namespaces.
|
|
|
|
The kernel will lock the aforementioned flags to protect these sensitive
|
|
|
|
properties from being altered.
|
|
|
|
.IP \(bu
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
A new mount and user namespace pair is created.
|
2021-08-08 08:41:30 +00:00
|
|
|
This happens for example when specifying
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.B CLONE_NEWUSER | CLONE_NEWNS
|
2021-08-08 08:41:30 +00:00
|
|
|
in
|
|
|
|
.BR unshare (2),
|
|
|
|
.BR clone (2),
|
|
|
|
or
|
2021-08-09 04:33:03 +00:00
|
|
|
.BR clone3 (2).
|
2021-08-09 04:48:14 +00:00
|
|
|
The aforementioned flags become locked to protect user namespaces from altering
|
2021-08-08 08:41:30 +00:00
|
|
|
sensitive mount properties.
|
|
|
|
.RE
|
|
|
|
.TP
|
|
|
|
.B EPERM
|
|
|
|
A valid file descriptor value was specified in
|
2021-08-09 04:48:14 +00:00
|
|
|
.IR userns_fd ,
|
2021-08-08 08:41:30 +00:00
|
|
|
but the file descriptor refers to the initial user namespace.
|
|
|
|
.TP
|
|
|
|
.B EPERM
|
2021-08-10 19:54:42 +00:00
|
|
|
An attempt was made to add an ID mapping to a mount that is already ID mapped.
|
2021-08-08 08:41:30 +00:00
|
|
|
.TP
|
|
|
|
.B EPERM
|
|
|
|
The caller does not have
|
2021-08-09 04:48:14 +00:00
|
|
|
.B CAP_SYS_ADMIN
|
2021-08-08 08:41:30 +00:00
|
|
|
in the initial user namespace.
|
|
|
|
.SH VERSIONS
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR mount_setattr ()
|
2021-08-08 08:41:30 +00:00
|
|
|
first appeared in Linux 5.12.
|
|
|
|
.\" commit 7d6beb71da3cc033649d641e1e608713b8220290
|
|
|
|
.\" commit 2a1867219c7b27f928e2545782b86daaf9ad50bd
|
|
|
|
.\" commit 9caccd41541a6f7d6279928d9f971f6642c361af
|
|
|
|
.SH CONFORMING TO
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR mount_setattr ()
|
|
|
|
is Linux-specific.
|
2021-08-08 08:41:30 +00:00
|
|
|
.SH NOTES
|
2021-08-10 00:08:49 +00:00
|
|
|
.SS ID-mapped mounts
|
|
|
|
Creating an ID-mapped mount makes it possible to
|
|
|
|
change the ownership of all files located under a mount.
|
|
|
|
Thus, ID-mapped mounts make it possible to
|
|
|
|
change ownership in a temporary and localized way.
|
2021-08-10 19:54:42 +00:00
|
|
|
It is a localized change because the ownership changes are
|
|
|
|
visible only via a specific mount.
|
2021-08-10 00:08:49 +00:00
|
|
|
All other users and locations where the filesystem is exposed are unaffected.
|
2021-08-10 22:28:43 +00:00
|
|
|
It is a temporary change because
|
|
|
|
the ownership changes are tied to the lifetime of the mount.
|
2021-08-10 00:08:49 +00:00
|
|
|
.PP
|
|
|
|
Whenever callers interact with the filesystem through an ID-mapped mount,
|
|
|
|
the ID mapping of the mount will be applied to
|
|
|
|
user and group IDs associated with filesystem objects.
|
|
|
|
This encompasses the user and group IDs associated with inodes
|
|
|
|
and also the following
|
|
|
|
.BR xattr (7)
|
|
|
|
keys:
|
|
|
|
.IP \(bu 3
|
|
|
|
.IR security.capability ,
|
|
|
|
whenever filesystem capabilities
|
|
|
|
are stored or returned in the
|
|
|
|
.B VFS_CAP_REVISION_3
|
|
|
|
format,
|
|
|
|
which stores a root user ID alongside the capabilities
|
|
|
|
(see
|
|
|
|
.BR capabilities (7)).
|
|
|
|
.IP \(bu
|
|
|
|
.I system.posix_acl_access
|
|
|
|
and
|
|
|
|
.IR system.posix_acl_default ,
|
|
|
|
whenever user IDs or group IDs are stored in
|
|
|
|
.B ACL_USER
|
|
|
|
or
|
|
|
|
.B ACL_GROUP
|
|
|
|
entries.
|
|
|
|
.PP
|
|
|
|
The following conditions must be met in order to create an ID-mapped mount:
|
|
|
|
.IP \(bu 3
|
|
|
|
The caller must have the
|
|
|
|
.B CAP_SYS_ADMIN
|
|
|
|
capability in the initial user namespace.
|
|
|
|
.IP \(bu
|
2021-08-10 19:54:42 +00:00
|
|
|
The filesystem must be mounted in a mount namespace
|
|
|
|
that is owned by the initial user namespace.
|
2021-08-10 00:08:49 +00:00
|
|
|
.IP \(bu
|
|
|
|
The underlying filesystem must support ID-mapped mounts.
|
2021-08-10 00:13:42 +00:00
|
|
|
Currently, the
|
2021-08-10 00:08:49 +00:00
|
|
|
.BR xfs (5),
|
|
|
|
.BR ext4 (5),
|
|
|
|
and
|
|
|
|
.B FAT
|
|
|
|
filesystems support ID-mapped mounts
|
|
|
|
with more filesystems being actively worked on.
|
|
|
|
.IP \(bu
|
|
|
|
The mount must not already be ID-mapped.
|
|
|
|
This also implies that the ID mapping of a mount cannot be altered.
|
|
|
|
.IP \(bu
|
2021-08-10 19:54:42 +00:00
|
|
|
The mount must be a detached mount;
|
2021-08-10 00:08:49 +00:00
|
|
|
that is,
|
|
|
|
it must have been created by calling
|
|
|
|
.BR open_tree (2)
|
|
|
|
with the
|
|
|
|
.B OPEN_TREE_CLONE
|
|
|
|
flag and it must not already have been visible in the filesystem.
|
|
|
|
.PP
|
|
|
|
ID mappings can be created for user IDs, group IDs, and project IDs.
|
|
|
|
An ID mapping is essentially a mapping of a range of user or group IDs into
|
|
|
|
another or the same range of user or group IDs.
|
2021-08-10 19:54:42 +00:00
|
|
|
ID mappings are written to map files as three numbers
|
|
|
|
separated by white space.
|
2021-08-10 00:08:49 +00:00
|
|
|
The first two numbers specify the starting user or group ID
|
|
|
|
in each of the two user namespaces.
|
|
|
|
The third number specifies the range of the ID mapping.
|
2021-08-10 19:54:42 +00:00
|
|
|
For example,
|
|
|
|
a mapping for user IDs such as "1000\ 1001\ 1" would indicate that
|
2021-08-10 00:08:49 +00:00
|
|
|
user ID 1000 in the caller's user namespace is mapped to
|
|
|
|
user ID 1001 in its ancestor user namespace.
|
|
|
|
Since the map range is 1,
|
|
|
|
only user ID 1000 is mapped.
|
|
|
|
.PP
|
|
|
|
It is possible to specify up to 340 ID mappings for each ID mapping type.
|
|
|
|
If any user IDs or group IDs are not mapped,
|
|
|
|
all files owned by that unmapped user or group ID will appear as
|
|
|
|
being owned by the overflow user ID or overflow group ID respectively.
|
|
|
|
.PP
|
2021-08-10 22:28:43 +00:00
|
|
|
Further details on setting up ID mappings can be found in
|
|
|
|
.BR user_namespaces (7).
|
2021-08-10 00:08:49 +00:00
|
|
|
.PP
|
|
|
|
In the common case, the user namespace passed in
|
|
|
|
.I userns_fd
|
2021-08-10 22:28:43 +00:00
|
|
|
(together with
|
2021-08-10 00:08:49 +00:00
|
|
|
.B MOUNT_ATTR_IDMAP
|
|
|
|
in
|
2021-08-10 22:28:43 +00:00
|
|
|
.IR attr_set )
|
2021-08-10 00:08:49 +00:00
|
|
|
to create an ID-mapped mount will be the user namespace of a container.
|
|
|
|
In other scenarios it will be a dedicated user namespace associated with
|
|
|
|
a user's login session as is the case for portable home directories in
|
|
|
|
.BR systemd-homed.service (8)).
|
|
|
|
It is also perfectly fine to create a dedicated user namespace
|
|
|
|
for the sake of ID mapping a mount.
|
|
|
|
.PP
|
|
|
|
ID-mapped mounts can be useful in the following
|
|
|
|
and a variety of other scenarios:
|
|
|
|
.IP \(bu 3
|
2021-08-10 19:54:42 +00:00
|
|
|
Sharing files or filesystems
|
|
|
|
between multiple users or multiple machines,
|
2021-08-10 00:08:49 +00:00
|
|
|
especially in complex scenarios.
|
|
|
|
For example,
|
|
|
|
ID-mapped mounts are used to implement portable home directories in
|
|
|
|
.BR systemd-homed.service (8),
|
|
|
|
where they allow users to move their home directory
|
|
|
|
to an external storage device
|
|
|
|
and use it on multiple computers
|
|
|
|
where they are assigned different user IDs and group IDs.
|
|
|
|
This effectively makes it possible to
|
|
|
|
assign random user IDs and group IDs at login time.
|
|
|
|
.IP \(bu
|
2021-08-10 19:54:42 +00:00
|
|
|
Sharing files or filesystems
|
|
|
|
from the host with unprivileged containers.
|
2021-08-10 00:08:49 +00:00
|
|
|
This allows a user to avoid having to change ownership permanently through
|
|
|
|
.BR chown (2).
|
|
|
|
.IP \(bu
|
|
|
|
ID mapping a container's root filesystem.
|
|
|
|
Users don't need to change ownership permanently through
|
|
|
|
.BR chown (2).
|
|
|
|
Especially for large root filesystems, using
|
|
|
|
.BR chown (2)
|
|
|
|
can be prohibitively expensive.
|
|
|
|
.IP \(bu
|
2021-08-10 19:54:42 +00:00
|
|
|
Sharing files or filesystems
|
|
|
|
between containers with non-overlapping ID mappings.
|
2021-08-10 00:08:49 +00:00
|
|
|
.IP \(bu
|
|
|
|
Implementing discretionary access (DAC) permission checking
|
|
|
|
for filesystems lacking a concept of ownership.
|
|
|
|
.IP \(bu
|
|
|
|
Efficiently changing ownership on a per-mount basis.
|
|
|
|
In contrast to
|
|
|
|
.BR chown (2),
|
|
|
|
changing ownership of large sets of files is instantaneous with
|
|
|
|
ID-mapped mounts.
|
|
|
|
This is especially useful when ownership of
|
|
|
|
an entire root filesystem of a virtual machine or container
|
|
|
|
is to be changed as mentioned above.
|
|
|
|
With ID-mapped mounts,
|
|
|
|
a single
|
|
|
|
.BR mount_setattr ()
|
|
|
|
system call will be sufficient to change the ownership of all files.
|
|
|
|
.IP \(bu
|
|
|
|
Taking the current ownership into account.
|
|
|
|
ID mappings specify precisely
|
|
|
|
what a user or group ID is supposed to be mapped to.
|
|
|
|
This contrasts with the
|
|
|
|
.BR chown (2)
|
|
|
|
system call which cannot by itself
|
|
|
|
take the current ownership of the files it changes into account.
|
|
|
|
It simply changes the ownership to the specified user ID and group ID.
|
|
|
|
.IP \(bu
|
|
|
|
Locally and temporarily restricted ownership changes.
|
|
|
|
ID-mapped mounts make it possible to change ownership locally,
|
2021-08-10 19:54:42 +00:00
|
|
|
restricting the ownership changes to specific mounts,
|
2021-08-10 00:08:49 +00:00
|
|
|
and temporarily as the ownership changes only apply as long as the mount exists.
|
|
|
|
By contrast,
|
|
|
|
changing ownership via the
|
|
|
|
.BR chown (2)
|
|
|
|
system call changes the ownership globally and permanently.
|
|
|
|
.\"
|
2021-08-08 08:41:30 +00:00
|
|
|
.SS Extensibility
|
|
|
|
In order to allow for future extensibility,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR mount_setattr ()
|
2021-08-08 08:41:30 +00:00
|
|
|
requires the user-space application to specify the size of the
|
|
|
|
.I mount_attr
|
|
|
|
structure that it is passing.
|
|
|
|
By providing this information, it is possible for
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.BR mount_setattr ()
|
2021-08-08 08:41:30 +00:00
|
|
|
to provide both forwards- and backwards-compatibility, with
|
|
|
|
.I size
|
|
|
|
acting as an implicit version number.
|
|
|
|
(Because new extension fields will always
|
|
|
|
be appended, the structure size will always increase.)
|
|
|
|
This extensibility design is very similar to other system calls such as
|
|
|
|
.BR perf_setattr (2),
|
|
|
|
.BR perf_event_open (2),
|
|
|
|
.BR clone3 (2)
|
|
|
|
and
|
2021-08-09 04:33:03 +00:00
|
|
|
.BR openat2 (2).
|
2021-08-08 08:41:30 +00:00
|
|
|
.PP
|
|
|
|
Let
|
|
|
|
.I usize
|
|
|
|
be the size of the structure as specified by the user-space application,
|
|
|
|
and let
|
|
|
|
.I ksize
|
|
|
|
be the size of the structure which the kernel supports,
|
|
|
|
then there are three cases to consider:
|
2021-08-09 04:33:03 +00:00
|
|
|
.IP \(bu 3
|
2021-08-08 08:41:30 +00:00
|
|
|
If
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.I ksize
|
2021-08-08 08:41:30 +00:00
|
|
|
equals
|
|
|
|
.IR usize ,
|
|
|
|
then there is no version mismatch and
|
|
|
|
.I attr
|
|
|
|
can be used verbatim.
|
|
|
|
.IP \(bu
|
|
|
|
If
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.I ksize
|
2021-08-08 08:41:30 +00:00
|
|
|
is larger than
|
|
|
|
.IR usize ,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
then there are some extension fields that the kernel supports
|
|
|
|
which the user-space application is unaware of.
|
2021-08-08 08:41:30 +00:00
|
|
|
Because a zero value in any added extension field signifies a no-op,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
the kernel treats all of the extension fields
|
|
|
|
not provided by the user-space application
|
|
|
|
as having zero values.
|
2021-08-08 08:41:30 +00:00
|
|
|
This provides backwards-compatibility.
|
|
|
|
.IP \(bu
|
|
|
|
If
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.I ksize
|
2021-08-08 08:41:30 +00:00
|
|
|
is smaller than
|
|
|
|
.IR usize ,
|
|
|
|
then there are some extension fields which the user-space application is aware
|
|
|
|
of but which the kernel does not support.
|
|
|
|
Because any extension field must have its zero values signify a no-op,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
the kernel can safely ignore the unsupported extension fields
|
|
|
|
if they are all zero.
|
|
|
|
If any unsupported extension fields are non-zero,
|
|
|
|
then \-1 is returned and
|
2021-08-08 08:41:30 +00:00
|
|
|
.I errno
|
|
|
|
is set to
|
|
|
|
.BR E2BIG .
|
|
|
|
This provides forwards-compatibility.
|
|
|
|
.PP
|
|
|
|
Because the definition of
|
|
|
|
.I struct mount_attr
|
|
|
|
may change in the future
|
|
|
|
(with new fields being added when system headers are updated),
|
|
|
|
user-space applications should zero-fill
|
|
|
|
.I struct mount_attr
|
|
|
|
to ensure that recompiling the program with new headers will not result in
|
|
|
|
spurious errors at runtime.
|
|
|
|
The simplest way is to use a designated initializer:
|
|
|
|
.PP
|
|
|
|
.in +4n
|
|
|
|
.EX
|
|
|
|
struct mount_attr attr = {
|
|
|
|
.attr_set = MOUNT_ATTR_RDONLY,
|
|
|
|
.attr_clr = MOUNT_ATTR_NODEV
|
|
|
|
};
|
|
|
|
.EE
|
|
|
|
.in
|
|
|
|
.PP
|
2021-08-09 04:48:14 +00:00
|
|
|
Alternatively, the structure can be zero-filled using
|
2021-08-08 08:41:30 +00:00
|
|
|
.BR memset (3)
|
|
|
|
or similar functions:
|
|
|
|
.PP
|
|
|
|
.in +4n
|
|
|
|
.EX
|
|
|
|
struct mount_attr attr;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
|
|
attr.attr_set = MOUNT_ATTR_RDONLY;
|
|
|
|
attr.attr_clr = MOUNT_ATTR_NODEV;
|
|
|
|
.EE
|
|
|
|
.in
|
|
|
|
.PP
|
|
|
|
A user-space application that wishes to determine which extensions the running
|
|
|
|
kernel supports can do so by conducting a binary search on
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
.I size
|
2021-08-08 08:41:30 +00:00
|
|
|
with a structure which has every byte nonzero
|
|
|
|
(to find the largest value which doesn't produce an error of
|
2021-08-09 04:33:03 +00:00
|
|
|
.BR E2BIG ).
|
2021-08-08 08:41:30 +00:00
|
|
|
.SH EXAMPLES
|
|
|
|
.EX
|
|
|
|
/*
|
2021-08-09 04:48:14 +00:00
|
|
|
* This program allows the caller to create a new detached mount
|
|
|
|
* and set various properties on it.
|
2021-08-08 08:41:30 +00:00
|
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
#include <errno.h>
|
|
|
|
#include <fcntl.h>
|
|
|
|
#include <getopt.h>
|
|
|
|
#include <linux/mount.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <stdbool.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <sys/syscall.h>
|
|
|
|
#include <unistd.h>
|
|
|
|
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
static inline int
|
2021-08-12 01:27:01 +00:00
|
|
|
mount_setattr(int dirfd, const char *pathname, unsigned int flags,
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
struct mount_attr *attr, size_t size)
|
2021-08-08 08:41:30 +00:00
|
|
|
{
|
2021-08-12 01:27:01 +00:00
|
|
|
return syscall(SYS_mount_setattr, dirfd, pathname, flags, attr, size);
|
2021-08-08 08:41:30 +00:00
|
|
|
}
|
|
|
|
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
static inline int
|
2021-08-09 21:29:42 +00:00
|
|
|
open_tree(int dirfd, const char *filename, unsigned int flags)
|
2021-08-08 08:41:30 +00:00
|
|
|
{
|
2021-08-09 21:29:42 +00:00
|
|
|
return syscall(SYS_open_tree, dirfd, filename, flags);
|
2021-08-08 08:41:30 +00:00
|
|
|
}
|
|
|
|
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
static inline int
|
2021-08-09 21:29:42 +00:00
|
|
|
move_mount(int from_dirfd, const char *from_pathname,
|
|
|
|
int to_dirfd, const char *to_pathname, unsigned int flags)
|
2021-08-08 08:41:30 +00:00
|
|
|
{
|
2021-08-09 21:29:42 +00:00
|
|
|
return syscall(SYS_move_mount, from_dirfd, from_pathname,
|
|
|
|
to_dirfd, to_pathname, flags);
|
2021-08-08 08:41:30 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static const struct option longopts[] = {
|
2021-08-09 20:56:47 +00:00
|
|
|
{"map\-mount", required_argument, NULL, 'a'},
|
2021-08-08 08:41:30 +00:00
|
|
|
{"recursive", no_argument, NULL, 'b'},
|
2021-08-09 20:56:47 +00:00
|
|
|
{"read\-only", no_argument, NULL, 'c'},
|
|
|
|
{"block\-setid", no_argument, NULL, 'd'},
|
|
|
|
{"block\-devices", no_argument, NULL, 'e'},
|
|
|
|
{"block\-exec", no_argument, NULL, 'f'},
|
|
|
|
{"no\-access\-time", no_argument, NULL, 'g'},
|
2021-08-08 08:41:30 +00:00
|
|
|
{ NULL, 0, NULL, 0 },
|
|
|
|
};
|
|
|
|
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
#define exit_log(format, ...) do \e
|
|
|
|
{ \e
|
|
|
|
fprintf(stderr, format, ##__VA_ARGS__); \e
|
|
|
|
exit(EXIT_FAILURE); \e
|
|
|
|
} while (0)
|
2021-08-08 08:41:30 +00:00
|
|
|
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
int
|
|
|
|
main(int argc, char *argv[])
|
2021-08-08 08:41:30 +00:00
|
|
|
{
|
2021-08-09 20:56:47 +00:00
|
|
|
struct mount_attr *attr = &(struct mount_attr){};
|
2021-08-10 19:54:42 +00:00
|
|
|
int fd_userns = \-1;
|
2021-08-08 08:41:30 +00:00
|
|
|
bool recursive = false;
|
2021-08-09 20:56:47 +00:00
|
|
|
int index = 0;
|
|
|
|
int ret;
|
2021-08-08 08:41:30 +00:00
|
|
|
|
|
|
|
while ((ret = getopt_long_only(argc, argv, "",
|
mount_setattr.2: Minor tweaks to Christian's patch
- Fix SYNOPSIS to fit in 78 columns
Also, we don't show when an include is included for a specific type,
unless that header is included _only_ for the type,
or there might be confusion (e.g., termios).
Instead, that type should be documented in system_data_types(7),
with a link page mount_attr-struct(3).
- Fix references to mount_setattr(). See man-pages(7):
Any reference to the subject of the current manual page should be writ‐
ten with the name in bold followed by a pair of parentheses in Roman
(normal) font. For example, in the fcntl(2) man page, references to
the subject of the page would be written as: fcntl(). The preferred
way to write this in the source file is:
.BR fcntl ()
- Fix line breaks according to semantic newline rules (and add some commas)
- Fix wrong usage of .IR when .RI should have been used
- Fix formatting of variable part in FOO<number>:
- Make italic the variable part (as groff_man(7) recommends)
- Remove <>
- Use syntax recommended by G. Branden Robinson (groff)
- Fix unnecessary uses of .BR or .IR when .B or .I would suffice
- Fix formatting of punctuation
In some cases, it was in italics or bold, and it should always be in roman.
- Use uppercase to begin text, even in bullet points, since those were
multi-sentence.
- Simplify usage of .RS/.RE in combination with .IP
- s/fat/FAT/ as fs(7) does
- Slightly reword some sentences for consistency
- Use Linux-specific for consistency with other pages (in VERSIONS)
- EXAMPLES: Place the return type in a line of its own (as in other pages)
- Fix alignment of code
- Replace unnecessary use of the GNU extension ({}) by do {} while (0)
In that case, there was no return value (moreover, it's a noreturn).
- Break complex declaration lines into a line for each variable
The variables were being initialized, some to non-zero values,
so for clarity, a line for each one seems more appropriate.
- Add const to pointers when possible
- s/\\/\e/
- Remove unmatched groff commands
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2021-08-08 08:41:31 +00:00
|
|
|
longopts, &index)) != \-1) {
|
2021-08-08 08:41:30 +00:00
|
|
|
switch (ret) {
|
|
|
|
case 'a':
|
|
|
|
fd_userns = open(optarg, O_RDONLY | O_CLOEXEC);
|
|
|
|
if (fd_userns == \-1)
|
2021-08-09 04:48:14 +00:00
|
|
|
exit_log("%m \- Failed top open %s\en", optarg);
|
2021-08-08 08:41:30 +00:00
|
|
|
break;
|
|
|
|
case 'b':
|
|
|
|
recursive = true;
|
|
|
|
break;
|
|
|
|
case 'c':
|
2021-08-09 20:56:47 +00:00
|
|
|
attr\->attr_set |= MOUNT_ATTR_RDONLY;
|
2021-08-08 08:41:30 +00:00
|
|
|
break;
|
|
|
|
case 'd':
|
2021-08-09 20:56:47 +00:00
|
|
|
attr\->attr_set |= MOUNT_ATTR_NOSUID;
|
2021-08-08 08:41:30 +00:00
|
|
|
break;
|
|
|
|
case 'e':
|
2021-08-09 20:56:47 +00:00
|
|
|
attr\->attr_set |= MOUNT_ATTR_NODEV;
|
2021-08-08 08:41:30 +00:00
|
|
|
break;
|
|
|
|
case 'f':
|
2021-08-09 20:56:47 +00:00
|
|
|
attr\->attr_set |= MOUNT_ATTR_NOEXEC;
|
2021-08-08 08:41:30 +00:00
|
|
|
break;
|
|
|
|
case 'g':
|
2021-08-09 20:56:47 +00:00
|
|
|
attr\->attr_set |= MOUNT_ATTR_NOATIME;
|
|
|
|
attr\->attr_clr |= MOUNT_ATTR__ATIME;
|
2021-08-08 08:41:30 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
exit_log("Invalid argument specified");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-08-09 21:17:41 +00:00
|
|
|
if ((argc \- optind) < 2)
|
2021-08-09 04:48:14 +00:00
|
|
|
exit_log("Missing source or target mount point\en");
|
2021-08-08 08:41:30 +00:00
|
|
|
|
2021-08-09 21:17:41 +00:00
|
|
|
const char *source = argv[optind];
|
|
|
|
const char *target = argv[optind + 1];
|
2021-08-09 20:56:47 +00:00
|
|
|
|
2021-08-12 03:16:42 +00:00
|
|
|
/* In the following, \-1 as the \(aqdirfd\(aq argument ensures that
|
|
|
|
open_tree() fails if \(aqsource\(aq is not an absolute pathname. */
|
|
|
|
|
|
|
|
int fd_tree = open_tree(\-1, source,
|
2021-08-09 20:56:47 +00:00
|
|
|
OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC |
|
|
|
|
AT_EMPTY_PATH | (recursive ? AT_RECURSIVE : 0));
|
2021-08-08 08:41:30 +00:00
|
|
|
if (fd_tree == \-1)
|
2021-08-09 04:48:14 +00:00
|
|
|
exit_log("%m \- Failed to open %s\en", source);
|
2021-08-08 08:41:30 +00:00
|
|
|
|
|
|
|
if (fd_userns >= 0) {
|
2021-08-09 20:56:47 +00:00
|
|
|
attr\->attr_set |= MOUNT_ATTR_IDMAP;
|
|
|
|
attr\->userns_fd = fd_userns;
|
2021-08-08 08:41:30 +00:00
|
|
|
}
|
2021-08-09 20:56:47 +00:00
|
|
|
|
2021-08-08 08:41:30 +00:00
|
|
|
ret = mount_setattr(fd_tree, "",
|
2021-08-09 20:56:47 +00:00
|
|
|
AT_EMPTY_PATH | (recursive ? AT_RECURSIVE : 0),
|
2021-08-08 08:41:30 +00:00
|
|
|
attr, sizeof(struct mount_attr));
|
|
|
|
if (ret == \-1)
|
2021-08-09 20:56:47 +00:00
|
|
|
exit_log("%m \- Failed to change mount attributes\en");
|
|
|
|
|
2021-08-08 08:41:30 +00:00
|
|
|
close(fd_userns);
|
|
|
|
|
2021-08-12 03:16:42 +00:00
|
|
|
/* In the following, \-1 as the \(aqto_dirfd\(aq argument ensures that
|
|
|
|
open_tree() fails if \(aqtarget\(aq is not an absolute pathname. */
|
|
|
|
|
|
|
|
ret = move_mount(fd_tree, "", \-1, target,
|
2021-08-08 08:41:30 +00:00
|
|
|
MOVE_MOUNT_F_EMPTY_PATH);
|
|
|
|
if (ret == \-1)
|
2021-08-09 04:33:03 +00:00
|
|
|
exit_log("%m \- Failed to attach mount to %s\en", target);
|
2021-08-09 20:56:47 +00:00
|
|
|
|
2021-08-08 08:41:30 +00:00
|
|
|
close(fd_tree);
|
|
|
|
|
|
|
|
exit(EXIT_SUCCESS);
|
|
|
|
}
|
|
|
|
.EE
|
|
|
|
.SH SEE ALSO
|
|
|
|
.BR newuidmap (1),
|
|
|
|
.BR newgidmap (1),
|
2021-08-09 20:44:33 +00:00
|
|
|
.BR clone (2),
|
|
|
|
.BR mount (2),
|
2021-08-08 08:41:30 +00:00
|
|
|
.BR unshare (2),
|
2021-08-09 20:44:33 +00:00
|
|
|
.BR proc (5),
|
|
|
|
.BR mount_namespaces (7),
|
|
|
|
.BR capabilities (7),
|
2021-08-08 08:41:30 +00:00
|
|
|
.BR user_namespaces (7),
|
2021-08-09 20:42:43 +00:00
|
|
|
.BR xattr (7)
|