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mount.2: Clearly distinguish per-mount-point vs per-superblock mount flags 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2018-08-20 16:24:20 +02:00
parent 2008f97d6f
commit 63b0b1a341
1 changed files with 33 additions and 8 deletions
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41
man2/mount.2
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@ -281,21 +281,46 @@ flag to
.BR open (2)
was specified for all file opens to this filesystem).
.PP
From Linux 2.4 onward, the
From Linux 2.4 onward, some of the above flags are
settable on a per-mount basis,
while others apply to the superblock of the mounted filesystem,
meaning that all mounts of the same filesystem share those flags.
(Previously, all of the flags were per-superblock.)
.PP
The per-mount-point flags are as follows:
.IP * 3
Since Linux 2.4:
.BR MS_NODEV ", " MS_NOEXEC ", and " MS_NOSUID
flags are settable on a per-mount-point basis.
From kernel 2.6.16 onward,
.IP *
Since Linux 2.6.16:
.B MS_NOATIME
and
.B MS_NODIRATIME
are also settable on a per-mount-point basis.
The
.B MS_RELATIME
flag is also settable on a per-mount-point basis.
.BR MS_NODIRATIME .
.IP *
Since Linux 2.6.20:
.BR MS_RELATIME .
.PP
The following flags are per-superblock:
.BR MS_DIRSYNC ,
.BR MS_LAZYTIME ,
.BR MS_MANDLOCK ,
.BR MS_MS_SILENT ,
and
.BR MS_SYNCHRONOUS .
.\" And MS_I_VERSION?
The inital settings of these flags are determined on the first
mount of the filesystem, and will be shared by all subsequent mounts
of the same filesystem.
Subsequently, the settings of the flags can be changed
via a remount operation (see below).
Such changes will be visible via all mount points associated
with the filesystem.
.PP
Since Linux 2.6.16,
.B MS_RDONLY
can be set or cleared on a per-mount-point basis as well as on
the underlying filesystem.
the underlying filesystem superblock.
The mounted filesystem will be writable only if neither the filesystem
nor the mountpoint are flagged as read-only.
.\"