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mount.2: Enhancements to MS_LAZYTIME description 

Cowritten-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-02-27 08:59:18 +01:00
parent 42a8e396cf
commit 9cdabfa62a
1 changed files with 19 additions and 3 deletions
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22
man2/mount.2
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@ -173,9 +173,25 @@ an undeleted inode is evicted from memory; or
more than 24 hours have passed since the inode was written to disk.
.RE
.IP
This mount option significantly reduces writes to the inode table
for some workloads
(e.g., when performing frequent random writes to preallocated files).
This mount significantly reduces writes
needed to update the inode's timestamps, especially mtime and atime.
However, in the event of a system crash, the atime and mtime fields
on disk might be out of date by up to 24 hours.
Examples of workloads where this option could be of significant benefit
include frequent random writes to preallocated files,
as well as cases where the
.B MS_STRICTATIME
mount option is also enabled.
(The advantage of
.I "(MS_STRICTATIME\ | MS_LAZYTIME)"
is that
.BR stat (2)
will return the correctly updated atime, but the atime updates
will be flushed to disk only when (1) the inode needs to be
updated for filesystem / data consistency reasons or (2) the
inode is pushed out of memory, or (3) the filesystem is
unmounted.)
.TP
.B MS_MANDLOCK
Permit mandatory locking on files in this filesystem.