common/xfs: add _require_scratch_xfs_shrink helper

In order to detect whether the current kernel supports XFS shrinking.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

diff --git a/common/xfs b/common/xfs
index 5cd7b35c9ec9a468c9ee31294bb0f69cd8849b61..0ec5b03ccc487a5315a5b305951441f12d0ae99d 100644 (file)
--- a/common/xfs
+++ b/common/xfs
@@ -786,6 +786,26 @@ _require_xfs_mkfs_without_validation()
        fi
 }
 
+_require_scratch_xfs_shrink()
+{
+       _require_scratch
+       _require_command "$XFS_GROWFS_PROG" xfs_growfs
+
+       _scratch_mkfs_xfs | _filter_mkfs 2>$tmp.mkfs >/dev/null
+       . $tmp.mkfs
+       _scratch_mount
+       # here just to check if kernel supports, no need do more extra work
+       local errmsg=$($XFS_GROWFS_PROG -D$((dblocks-1)) "$SCRATCH_MNT" 2>&1)
+       if [ "$?" -ne 0 ]; then
+               echo "$errmsg" | grep 'XFS_IOC_FSGROWFSDATA xfsctl failed: Invalid argument' > /dev/null && \
+                       _notrun "kernel does not support shrinking"
+               echo "$errmsg" | grep 'data size .* too small, old size is ' > /dev/null && \
+                       _notrun "xfsprogs does not support shrinking"
+               _fail "$XFS_GROWFS_PROG failed unexpectedly: $errmsg"
+       fi
+       _scratch_unmount
+}
+
 # XFS ability to change UUIDs on V5/CRC filesystems
 #
 _require_meta_uuid()