[XFS] Avoid using inodes that haven't been completely initialised

The radix tree walks in xfs_sync_inodes_ag and xfs_qm_dqrele_all_inodes()
can find inodes that are still undergoing initialisation. Avoid
them by checking for the the XFS_INEW() flag once we have a reference
on the inode. This flag is cleared once the inode is properly initialised.

SGI-PV: 987246

Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/xfs/quota/xfs_qm_syscalls.c b/fs/xfs/quota/xfs_qm_syscalls.c
index 2c57a6eaff36..68139b38aede 100644
--- a/fs/xfs/quota/xfs_qm_syscalls.c
+++ b/fs/xfs/quota/xfs_qm_syscalls.c
@@ -1080,6 +1080,12 @@ xfs_qm_dqrele_inodes_ag(
                 }
                 read_unlock(&pag->pag_ici_lock);
 
+                /* avoid new inodes though we shouldn't find any here */
+                if (xfs_iflags_test(ip, XFS_INEW)) {
+                        IRELE(ip);
+                        continue;
+                }
+
                 xfs_ilock(ip, XFS_ILOCK_EXCL);
                 if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
                         xfs_qm_dqrele(ip->i_udquot);