[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>

3 files changed, 9 insertions, 3 deletions

diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index f78bc2215764..69c98cf32336 100644
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -780,7 +780,6 @@ xfs_setup_inode(
         inode->i_ino = ip->i_ino;
         inode->i_state = I_NEW|I_LOCK;
         inode_add_to_lists(ip->i_mount->m_super, inode);
-        ASSERT(atomic_read(&inode->i_count) == 1);
 
         inode->i_mode   = ip->i_d.di_mode;
         inode->i_nlink  = ip->i_d.di_nlink;
diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index fb5cca3df840..d12d31b86fa0 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -117,8 +117,9 @@ xfs_sync_inodes_ag(
                 }
                 read_unlock(&pag->pag_ici_lock);
 
-                /* bad inodes are dealt with elsewhere */
-                if (is_bad_inode(inode)) {
+                /* avoid new or bad inodes */
+                if (is_bad_inode(inode) ||
+                    xfs_iflags_test(ip, XFS_INEW)) {
                         IRELE(ip);
                         continue;
                 }
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);