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fstests: Introduce check for explicit SHARED extent flag reporting

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For fs support reflink, some of them (OK, btrfs again) doesn't split
SHARED flag for extent fiemap reporting.

For example:
  0         4K         8K
   / File1: Extent 0  \
  /                    \
  |<- On disk Extent-->|
  |        /
  | File2 /
    Extent: 0

Fs supports explicit SHARED extent reporting should report fiemap like:
File1: 2 extents
Extent 0-4K: SHARED
Extent 4-8K:
File2: 1 extents
Extent 0-4K: SHARED

Fs doesn't support explicit reporting will report fiemap like:
File1: 1 extent
Extent 0-8K: SHARED
File2: 1 extent
Extent 0-4K: SHARED

Test case like generic/372 require explicit reporting will cause
false alert on btrfs.

Add such runtime check for that requirememt.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Qu Wenruo
2016-11-17 10:06:48 +08:00
committed by Eryu Guan
parent 21616145d2
commit 083ff5827b
2 changed files with 45 additions and 0 deletions
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common/reflink
+44
View File
@@ -78,6 +78,50 @@ _require_scratch_reflink()
_scratch_unmount
}
# this test requires scratch fs to report explicit SHARED flag
# e.g.
# 0 4K 8K
# / File1: Extent 0 \
# / \
# |<- On disk Extent-->|
# | /
# | File2 /
# Extent: 0
# Fs supports explicit SHARED extent reporting should report fiemap like:
# File1: 2 extents
# Extent 0-4K: SHARED
# Extent 4-8K:
# File2: 1 extents
# Extent 0-4K: SHARED
#
# Fs doesn't support explicit reporting will report fiemap like:
# File1: 1 extent
# Extent 0-8K: SHARED
# File2: 1 extent
# Extent 0-4K: SHARED
_require_scratch_explicit_shared_extents()
{
_require_scratch
_require_fiemap
_require_scratch_reflink
_require_xfs_io_command "reflink"
local nr_extents
_scratch_mkfs > /dev/null
_scratch_mount
_pwrite_byte 0x61 0 128k $SCRATCH_MNT/file1 >/dev/null
_reflink_range $SCRATCH_MNT/file1 0 $SCRATCH_MNT/file2 0 64k >/dev/null
_scratch_cycle_mount
nr_extents=$(_count_extents $SCRATCH_MNT/file1)
if [ $nr_extents -eq 1 ]; then
_notrun "Explicit SHARED flag reporting not support by filesystem type: $FSTYP"
fi
_scratch_unmount
}
# this test requires the test fs support dedupe...
_require_test_dedupe()
{
tests/generic/372
+1
View File
@@ -47,6 +47,7 @@ _supported_os Linux
_supported_fs generic
_require_scratch_reflink
_require_fiemap
_require_scratch_explicit_shared_extents
echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1