[PATCH 1/9] common: extract rt extent size for _get_file_block_size

Darrick J. Wong
2020-10-27T19:03:40Z

From: Darrick J. Wong <darrick.wong@oracle.com>

_get_file_block_size is intended to return the size (in bytes) of the
fundamental allocation unit for a file. This is required for remapping
operations like fallocate and reflink, which can only operate on
allocation units. Since the XFS realtime volume can be configure for
allocation units larger than 1 fs block, we need to factor that in here.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
common/rc | 13 ++++++++++---
common/xfs | 20 ++++++++++++++++++++
2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/common/rc b/common/rc
index 27a27ea3..41f93047 100644
--- a/common/rc
+++ b/common/rc
@@ -3974,11 +3974,18 @@ _get_file_block_size()
echo "Missing mount point argument for _get_file_block_size"
exit 1
fi
- if [ "$FSTYP" = "ocfs2" ]; then
+
+ case "$FSTYP" in
+ "ocfs2")
stat -c '%o' $1
- else
+ ;;
+ "xfs")
+ _xfs_get_file_block_size $1
+ ;;
+ *)
_get_block_size $1
- fi
+ ;;
+ esac
}

# Get the minimum block size of an fs.
diff --git a/common/xfs b/common/xfs
index 79dab058..3f5c14ba 100644
--- a/common/xfs
+++ b/common/xfs
@@ -174,6 +174,26 @@ _scratch_mkfs_xfs()
return $mkfs_status
}

+# Get the size of an allocation unit of a file. Normally this is just the
+# block size of the file, but for realtime files, this is the realtime extent
+# size.
+_xfs_get_file_block_size()
+{
+ local path="$1"
+
+ if ! ($XFS_IO_PROG -c "stat -v" "$path" 2>&1 | egrep -q '(rt-inherit|realtime)'); then
+ _get_block_size "$path"
+ return
+ fi
+
+ # Otherwise, call xfs_info until we find a mount point or the root.
+ path="$(readlink -m "$path")"
+ while ! $XFS_INFO_PROG "$path" &>/dev/null && [ "$path" != "/" ]; do
+ path="$(dirname "$path")"
+ done
+ $XFS_INFO_PROG "$path" | grep realtime | sed -e 's/^.*extsz=\([0-9]*\).*$/\1/g'
+}
+
# xfs_check script is planned to be deprecated. But, we want to
# be able to invoke "xfs_check" behavior in xfstests in order to
# maintain the current verification levels.