Merge branch 'master' into for-2.6.35

Conflicts:
	fs/block_dev.c

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

3 files changed, 44 insertions, 20 deletions

diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index 05cd85317f6f..fd9698215759 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -820,10 +820,10 @@ xfs_reclaim_inode(
          * call into reclaim to find it in a clean state instead of waiting for
          * it now. We also don't return errors here - if the error is transient
          * then the next reclaim pass will flush the inode, and if the error
-         * is permanent then the next sync reclaim will relcaim the inode and
+         * is permanent then the next sync reclaim will reclaim the inode and
          * pass on the error.
          */
-        if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount)) {
+        if (error && error != EAGAIN && !XFS_FORCED_SHUTDOWN(ip->i_mount)) {
                 xfs_fs_cmn_err(CE_WARN, ip->i_mount,
                         "inode 0x%llx background reclaim flush failed with %d",
                         (long long)ip->i_ino, error);
diff --git a/fs/xfs/xfs_dfrag.c b/fs/xfs/xfs_dfrag.c
index cd27c9d6c71f..5bba29a07812 100644
--- a/fs/xfs/xfs_dfrag.c
+++ b/fs/xfs/xfs_dfrag.c
@@ -177,16 +177,26 @@ xfs_swap_extents_check_format(
             XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) > tip->i_df.if_ext_max)
                 return EINVAL;
 
-        /* Check root block of temp in btree form to max in target */
+        /*
+         * If we are in a btree format, check that the temp root block will fit
+         * in the target and that it has enough extents to be in btree format
+         * in the target.
+         *
+         * Note that we have to be careful to allow btree->extent conversions
+         * (a common defrag case) which will occur when the temp inode is in
+         * extent format...
+         */
         if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE &&
-            XFS_IFORK_BOFF(ip) &&
-            tip->i_df.if_broot_bytes > XFS_IFORK_BOFF(ip))
+            ((XFS_IFORK_BOFF(ip) &&
+              tip->i_df.if_broot_bytes > XFS_IFORK_BOFF(ip)) ||
+             XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <= ip->i_df.if_ext_max))
                 return EINVAL;
 
-        /* Check root block of target in btree form to max in temp */
+        /* Reciprocal target->temp btree format checks */
         if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE &&
-            XFS_IFORK_BOFF(tip) &&
-            ip->i_df.if_broot_bytes > XFS_IFORK_BOFF(tip))
+            ((XFS_IFORK_BOFF(tip) &&
+              ip->i_df.if_broot_bytes > XFS_IFORK_BOFF(tip)) ||
+             XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <= tip->i_df.if_ext_max))
                 return EINVAL;
 
         return 0;
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index e8fba92d7cd9..2be019136287 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -745,9 +745,16 @@ xfs_log_move_tail(xfs_mount_t	*mp,
 
 /*
  * Determine if we have a transaction that has gone to disk
- * that needs to be covered. Log activity needs to be idle (no AIL and
- * nothing in the iclogs). And, we need to be in the right state indicating
- * something has gone out.
+ * that needs to be covered. To begin the transition to the idle state
+ * firstly the log needs to be idle (no AIL and nothing in the iclogs).
+ * If we are then in a state where covering is needed, the caller is informed
+ * that dummy transactions are required to move the log into the idle state.
+ *
+ * Because this is called as part of the sync process, we should also indicate
+ * that dummy transactions should be issued in anything but the covered or
+ * idle states. This ensures that the log tail is accurately reflected in
+ * the log at the end of the sync, hence if a crash occurrs avoids replay
+ * of transactions where the metadata is already on disk.
  */
 int
 xfs_log_need_covered(xfs_mount_t *mp)
@@ -759,17 +766,24 @@ xfs_log_need_covered(xfs_mount_t *mp)
                 return 0;
 
         spin_lock(&log->l_icloglock);
-        if (((log->l_covered_state == XLOG_STATE_COVER_NEED) ||
-                (log->l_covered_state == XLOG_STATE_COVER_NEED2))
-                        && !xfs_trans_ail_tail(log->l_ailp)
-                        && xlog_iclogs_empty(log)) {
-                if (log->l_covered_state == XLOG_STATE_COVER_NEED)
-                        log->l_covered_state = XLOG_STATE_COVER_DONE;
-                else {
-                        ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2);
-                        log->l_covered_state = XLOG_STATE_COVER_DONE2;
+        switch (log->l_covered_state) {
+        case XLOG_STATE_COVER_DONE:
+        case XLOG_STATE_COVER_DONE2:
+        case XLOG_STATE_COVER_IDLE:
+                break;
+        case XLOG_STATE_COVER_NEED:
+        case XLOG_STATE_COVER_NEED2:
+                if (!xfs_trans_ail_tail(log->l_ailp) &&
+                    xlog_iclogs_empty(log)) {
+                        if (log->l_covered_state == XLOG_STATE_COVER_NEED)
+                                log->l_covered_state = XLOG_STATE_COVER_DONE;
+                        else
+                                log->l_covered_state = XLOG_STATE_COVER_DONE2;
                 }
+                /* FALLTHRU */
+        default:
                 needed = 1;
+                break;
         }
         spin_unlock(&log->l_icloglock);
         return needed;