[PATCH v17 04/11] xfs: Add helper xfs_attr_set_fmt

Allison Henderson
2021-04-16T09:21:07Z

This patch adds a helper function xfs_attr_set_fmt. This will help
isolate the code that will require state management from the portions
that do not. xfs_attr_set_fmt returns 0 when the attr has been set and
no further action is needed. It returns -EAGAIN when shortform has been
transformed to leaf, and the calling function should proceed the set the
attr in leaf form.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
---
fs/xfs/libxfs/xfs_attr.c | 79 ++++++++++++++++++++++++++++--------------------
1 file changed, 46 insertions(+), 33 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 6987ee5..fff1c6f 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -216,6 +216,48 @@ xfs_attr_is_shortform(
ip->i_afp->if_nextents == 0);
}

+STATIC int
+xfs_attr_set_fmt(
+ struct xfs_da_args *args)
+{
+ struct xfs_buf *leaf_bp = NULL;
+ struct xfs_inode *dp = args->dp;
+ int error2, error = 0;
+
+ /*
+ * Try to add the attr to the attribute list in the inode.
+ */
+ error = xfs_attr_try_sf_addname(dp, args);
+ if (error != -ENOSPC) {
+ error2 = xfs_trans_commit(args->trans);
+ args->trans = NULL;
+ return error ? error : error2;
+ }
+
+ /*
+ * It won't fit in the shortform, transform to a leaf block.
+ * GROT: another possible req'mt for a double-split btree op.
+ */
+ error = xfs_attr_shortform_to_leaf(args, &leaf_bp);
+ if (error)
+ return error;
+
+ /*
+ * Prevent the leaf buffer from being unlocked so that a
+ * concurrent AIL push cannot grab the half-baked leaf buffer
+ * and run into problems with the write verifier.
+ */
+ xfs_trans_bhold(args->trans, leaf_bp);
+ error = xfs_defer_finish(&args->trans);
+ xfs_trans_bhold_release(args->trans, leaf_bp);
+ if (error) {
+ xfs_trans_brelse(args->trans, leaf_bp);
+ return error;
+ }
+
+ return -EAGAIN;
+}
+
/*
* Set the attribute specified in @args.
*/
@@ -224,8 +266,7 @@ xfs_attr_set_args(
struct xfs_da_args *args)
{
struct xfs_inode *dp = args->dp;
- struct xfs_buf *leaf_bp = NULL;
- int error2, error = 0;
+ int error;

/*
* If the attribute list is already in leaf format, jump straight to
@@ -234,36 +275,9 @@ xfs_attr_set_args(
* again.
*/
if (xfs_attr_is_shortform(dp)) {
- /*
- * Try to add the attr to the attribute list in the inode.
- */
- error = xfs_attr_try_sf_addname(dp, args);
- if (error != -ENOSPC) {
- error2 = xfs_trans_commit(args->trans);
- args->trans = NULL;
- return error ? error : error2;
- }
-
- /*
- * It won't fit in the shortform, transform to a leaf block.
- * GROT: another possible req'mt for a double-split btree op.
- */
- error = xfs_attr_shortform_to_leaf(args, &leaf_bp);
- if (error)
- return error;
-
- /*
- * Prevent the leaf buffer from being unlocked so that a
- * concurrent AIL push cannot grab the half-baked leaf buffer
- * and run into problems with the write verifier.
- */
- xfs_trans_bhold(args->trans, leaf_bp);
- error = xfs_defer_finish(&args->trans);
- xfs_trans_bhold_release(args->trans, leaf_bp);
- if (error) {
- xfs_trans_brelse(args->trans, leaf_bp);
+ error = xfs_attr_set_fmt(args);
+ if (error != -EAGAIN)
return error;
- }
}

if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
@@ -297,8 +311,7 @@ xfs_attr_set_args(
return error;
}

- error = xfs_attr_node_addname(args);
- return error;
+ return xfs_attr_node_addname(args);
}

/*
--
2.7.4