Re: [PATCH v2] fstrim: document kernel return minlen explicitly

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Tue, Apr 23, 2019 at 11:58:28PM +0900, Wang Shilong wrote:
> From: Wang Shilong <wshilong@ddn.com>
> 
> 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>

Looks ok to me,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> ---
> v1->v2:
> better explain as darrick suggestion..
> ---
>  sys-utils/fstrim.8 | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/sys-utils/fstrim.8 b/sys-utils/fstrim.8
> index f7e7aa9ef..c6ecca706 100644
> --- a/sys-utils/fstrim.8
> +++ b/sys-utils/fstrim.8
> @@ -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
> -- 
> 2.21.0
>