[PATCH v25 05/14] xfsprogs: Return from xfs_attr_set_iter if there are no more rmtblks to process

[Allison Henderson <allison.henderson@oracle.com>]

Source kernel commit: df21062113850c5aaeaa38b5194ee4c64767fb7a

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 no further blocks need to be added or removed, 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>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 libxfs/xfs_attr.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index 2957fd030423..53f4d546ed6e 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -412,6 +412,14 @@ 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->op_flags & XFS_DA_OP_RENAME))
+				return 0;
+
 			dac->dela_state = XFS_DAS_FOUND_NBLK;
 		}
 		trace_xfs_attr_set_iter_return(dac->dela_state,	args->dp);
-- 
2.25.1