[PATCH v22 04/16] xfs: Return from xfs_attr_set_iter if there are no more rmtblks to process

Allison Henderson
2021-07-27T06:21:17Z

During an attr rename operation, blocks are saved for later removal
as rmtblkno2. The rmtblkno is used in the case of needing to alloc
more blocks if not enough were available. However, in the case
that neither rmtblkno or rmtblkno2 are set, we can return as soon
as xfs_attr_node_addname completes, rather than rolling the transaction
with an -EAGAIN return. This extra loop does not hurt anything right
now, but it will be a problem later when we get into log items because
we end up with an empty log transaction. So, add a simple check to
cut out the unneeded iteration.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
fs/xfs/libxfs/xfs_attr.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index d9d7d51..5040fc1 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -409,6 +409,13 @@ xfs_attr_set_iter(
if (error)
return error;

+ /*
+ * If addname was successful, and we dont need to alloc
+ * or remove anymore blks, we're done.
+ */
+ if (!args->rmtblkno && !args->rmtblkno2)
+ return 0;
+
dac->dela_state = XFS_DAS_FOUND_NBLK;
}
return -EAGAIN;
--
2.7.4