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common: add helper to count number of exclusive extents in a file

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Add a new helper that is similar to _count_extents() except that
extents that are shared several times by the file with itself
(reflinked at different file offsets) are accounted 1 time only,
instead of N times.

This is motivated by a subsequent test for btrfs that will use this
new helper, to verify that send streams are issuing reflink
operations.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Filipe Manana
2019-11-05 14:56:40 +00:00
committed by Eryu Guan
parent e1670cce6a
commit 6fb111ab60
1 changed files with 9 additions and 0 deletions
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common/rc
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@@ -3202,6 +3202,15 @@ _count_extents()
$XFS_IO_PROG -r -c "fiemap" $1 | tail -n +2 | grep -v hole | wc -l
}
# Similar to _count_extents() but if any extent is shared multiples times in
# the file (reflinked to different file offsets), it is accounted as 1 extent
# instead of N extents.
_count_exclusive_extents()
{
$XFS_IO_PROG -r -c "fiemap" $1 | tail -n +2 | grep -v hole | \
cut -d ' ' -f 3 | sort | uniq | wc -l
}
_count_holes()
{
$XFS_IO_PROG -r -c "fiemap" $1 | tail -n +2 | grep hole | wc -l