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 <quwen...@cn.fujitsu.com>
---
common/reflink | 44 ++++++++++++++++++++++++++++++++++++++++++++
tests/generic/372 | 1 +
2 files changed, 45 insertions(+)
diff --git a/common/reflink b/common/reflink
index 8b34046..9ada2e8 100644
--- a/common/reflink
+++ b/common/reflink
@@ -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
+ _reflink_range $SCRATCH_MNT/file1 0 $SCRATCH_MNT/file2 0 64k
+
+ _scratch_cycle_mount
+
+ nr_extents=$(_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()
{
diff --git a/tests/generic/372 b/tests/generic/372
index 31dff20..51a3eca 100755
--- a/tests/generic/372
+++ b/tests/generic/372
@@ -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
--
2.7.4
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