[PATCH V5 1/2] common/xfs: Add a helper to export inode core size

[Ziyang Zhang <ZiyangZhang@linux.alibaba.com>]

Some xfs test cases need the number of bytes reserved for only the inode
record, excluding the immediate fork areas. Now the value is hard-coded
and it is not a good chioce. Add a helper in common/xfs to export the
inode core size.

Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Ziyang Zhang <ZiyangZhang@linux.alibaba.com>
---
 common/xfs    | 15 +++++++++++++++
 tests/xfs/335 |  3 ++-
 tests/xfs/336 |  3 ++-
 tests/xfs/337 |  3 ++-
 tests/xfs/341 |  3 ++-
 tests/xfs/342 |  3 ++-
 6 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/common/xfs b/common/xfs
index 8ac1964e..674384a9 100644
--- a/common/xfs
+++ b/common/xfs
@@ -1486,3 +1486,18 @@ _require_xfsrestore_xflag()
 	$XFSRESTORE_PROG -h 2>&1 | grep -q -e '-x' || \
 			_notrun 'xfsrestore does not support -x flag.'
 }
+
+# Number of bytes reserved for only the inode record, excluding the
+# immediate fork areas.
+_xfs_get_inode_core_bytes()
+{
+	local dir="$1"
+	
+	if _xfs_has_feature "$dir" crc; then
+		# v5 filesystems
+		echo 176
+	else
+		# v4 filesystems
+		echo 96
+	fi
+}
diff --git a/tests/xfs/335 b/tests/xfs/335
index ccc508e7..3f5223ee 100755
--- a/tests/xfs/335
+++ b/tests/xfs/335
@@ -31,7 +31,8 @@ blksz="$(_get_block_size $SCRATCH_MNT)"
 echo "Create a three-level rtrmapbt"
 # inode core size is at least 176 bytes; btree header is 56 bytes;
 # rtrmap record is 32 bytes; and rtrmap key/pointer are 56 bytes.
-i_ptrs=$(( (isize - 176) / 56 ))
+i_core_size="$(_xfs_get_inode_core_bytes $SCRATCH_MNT)"
+i_ptrs=$(( (isize - i_core_size) / 56 ))
 bt_ptrs=$(( (blksz - 56) / 56 ))
 bt_recs=$(( (blksz - 56) / 32 ))
 
diff --git a/tests/xfs/336 b/tests/xfs/336
index b1de8e5f..a686fab4 100755
--- a/tests/xfs/336
+++ b/tests/xfs/336
@@ -42,7 +42,8 @@ rm -rf $metadump_file
 echo "Create a three-level rtrmapbt"
 # inode core size is at least 176 bytes; btree header is 56 bytes;
 # rtrmap record is 32 bytes; and rtrmap key/pointer are 56 bytes.
-i_ptrs=$(( (isize - 176) / 56 ))
+i_core_size="$(_xfs_get_inode_core_bytes $SCRATCH_MNT)"
+i_ptrs=$(( (isize - i_core_size) / 56 ))
 bt_ptrs=$(( (blksz - 56) / 56 ))
 bt_recs=$(( (blksz - 56) / 32 ))
 
diff --git a/tests/xfs/337 b/tests/xfs/337
index a2515e36..3bdef4e3 100755
--- a/tests/xfs/337
+++ b/tests/xfs/337
@@ -33,7 +33,8 @@ blksz="$(_get_block_size $SCRATCH_MNT)"
 
 # inode core size is at least 176 bytes; btree header is 56 bytes;
 # rtrmap record is 32 bytes; and rtrmap key/pointer are 56 bytes.
-i_ptrs=$(( (isize - 176) / 56 ))
+i_core_size="$(_xfs_get_inode_core_bytes $SCRATCH_MNT)"
+i_ptrs=$(( (isize - i_core_size) / 56 ))
 bt_ptrs=$(( (blksz - 56) / 56 ))
 bt_recs=$(( (blksz - 56) / 32 ))
 
diff --git a/tests/xfs/341 b/tests/xfs/341
index f026aa37..72f75318 100755
--- a/tests/xfs/341
+++ b/tests/xfs/341
@@ -33,7 +33,8 @@ rtextsz_blks=$((rtextsz / blksz))
 
 # inode core size is at least 176 bytes; btree header is 56 bytes;
 # rtrmap record is 32 bytes; and rtrmap key/pointer are 56 bytes.
-i_ptrs=$(( (isize - 176) / 56 ))
+i_core_size="$(_xfs_get_inode_core_bytes $SCRATCH_MNT)"
+i_ptrs=$(( (isize - i_core_size) / 56 ))
 bt_recs=$(( (blksz - 56) / 32 ))
 
 blocks=$((i_ptrs * bt_recs + 1))
diff --git a/tests/xfs/342 b/tests/xfs/342
index 1ae414eb..0b3b136c 100755
--- a/tests/xfs/342
+++ b/tests/xfs/342
@@ -30,7 +30,8 @@ blksz="$(_get_block_size $SCRATCH_MNT)"
 
 # inode core size is at least 176 bytes; btree header is 56 bytes;
 # rtrmap record is 32 bytes; and rtrmap key/pointer are 56 bytes.
-i_ptrs=$(( (isize - 176) / 56 ))
+i_core_size="$(_xfs_get_inode_core_bytes $SCRATCH_MNT)"
+i_ptrs=$(( (isize - i_core_size) / 56 ))
 bt_recs=$(( (blksz - 56) / 32 ))
 
 blocks=$((i_ptrs * bt_recs + 1))
-- 
2.18.4