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statfs.2: Document the 'f_flags' field added in Linux 2.6.36 

Reported-by: Jan Chaloupka <jchaloup@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-02-04 12:33:29 +01:00
parent 22795e81bb
commit 1d6523633e
1 changed files with 44 additions and 0 deletions
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man2/statfs.2
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@ -65,6 +65,8 @@ struct statfs {
fsid_t f_fsid; /* Filesystem ID */
__SWORD_TYPE f_namelen; /* Maximum length of filenames */
__SWORD_TYPE f_frsize; /* Fragment size (since Linux 2.6) */
__SWORD_TYPE f_flags; /* Mount flags of filesystem
(since Linux 2.6.36) */
/* Plus additional padding bytes reserved for future use */
};
@ -145,6 +147,48 @@ Filesystem types:
Most of these MAGIC constants are defined in
.IR /usr/include/linux/magic.h ,
and some are hardcoded in kernel sources.
The
.IR f_flags
is a bit mask indicating mount options for the file system.
It contains zero or more of the following bits:
.\" XXX Keep this list in sync with statvfs(3)
.TP
.B ST_MANDLOCK
Mandatory locking is permitted on the filesystem (see
.BR fcntl (2)).
.TP
.B ST_NOATIME
Do not update access times; see
.BR mount (2).
.TP
.B ST_NODEV
Disallow access to device special files on this filesystem.
.TP
.B ST_NODIRATIME
Do not update directory access times; see
.BR mount (2).
.TP
.B ST_NOEXEC
Execution of programs is disallowed on this filesystem.
.TP
.B ST_NOSUID
The set-user-ID and set-group-ID bits are ignored by
.BR exec (3)
for executable files on this filesystem
.TP
.B ST_RDONLY
This filesystem is mounted read-only.
.TP
.B ST_RELATIME
Update atime relative to mtime/ctime; see
.BR mount (2).
.TP
.B ST_SYNCHRONOUS
Writes are synched to the filesystem immediately (see the description of
.B O_SYNC
in
.BR open (2)).
.PP
Nobody knows what
.I f_fsid