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fstrim: document kernel return minlen explicitly 

Filesystem will modify @minlen according to its
block size etc, and will return actual unit
to userspace, document it into manpage.

Cc: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Wang Shilong 2019-04-23 23:58:28 +09:00 committed by Karel Zak
parent 19bc8ef897
commit ce3d198d7c
1 changed files with 5 additions and 4 deletions
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9
sys-utils/fstrim.8
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@ -76,10 +76,11 @@ the end of the filesystem.
.IP "\fB\-m, \-\-minimum\fP \fIminimum-size\fP"
Minimum contiguous free range to discard, in bytes. (This value is internally
rounded up to a multiple of the filesystem block size.) Free ranges smaller
than this will be ignored. By increasing this value, the fstrim operation
will complete more quickly for filesystems with badly fragmented freespace,
although not all blocks will be discarded. The default value is zero,
discarding every free block.
than this will be ignored and fstrim will adjust the minimum if it's smaller than
the device's minimum, and report that (fstrim_range.minlen) back to userspace.
By increasing this value, the fstrim operation will complete more quickly for
filesystems with badly fragmented freespace, although not all blocks will be
discarded. The default value is zero, discarding every free block.
.IP "\fB\-v, \-\-verbose\fP"
Verbose execution. With this option
.B fstrim