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authorDave Chinner <dchinner@redhat.com>2015-01-22 09:10:31 +1100
committerDave Chinner <david@fromorbit.com>2015-01-22 09:10:31 +1100
commit61e63ecb577f9b56bfb3182f1215b64e37a12c38 (patch)
treec2d45b022243adaf26b886232536307e02bc90ce /fs/xfs/xfs_log.c
parent4d11a40239405e531fc0e9dcd07921f00b965931 (diff)
xfs: consolidate superblock logging functions
We now have several superblock loggin functions that are identical except for the transaction reservation and whether it shoul dbe a synchronous transaction or not. Consolidate these all into a single function, a single reserveration and a sync flag and call it xfs_sync_sb(). Also, xfs_mod_sb() is not really a modification function - it's the operation of logging the superblock buffer. hence change the name of it to reflect this. Note that we have to change the mp->m_update_flags that are passed around at mount time to a boolean simply to indicate a superblock update is needed. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_log.c')
-rw-r--r--fs/xfs/xfs_log.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index e408bf5a3ff7..2b8dcf2b3dd1 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -33,6 +33,7 @@
#include "xfs_fsops.h"
#include "xfs_cksum.h"
#include "xfs_sysfs.h"
+#include "xfs_sb.h"
kmem_zone_t *xfs_log_ticket_zone;
@@ -1290,9 +1291,20 @@ xfs_log_worker(
struct xfs_mount *mp = log->l_mp;
/* dgc: errors ignored - not fatal and nowhere to report them */
- if (xfs_log_need_covered(mp))
- xfs_fs_log_dummy(mp);
- else
+ if (xfs_log_need_covered(mp)) {
+ /*
+ * Dump a transaction into the log that contains no real change.
+ * This is needed to stamp the current tail LSN into the log
+ * during the covering operation.
+ *
+ * We cannot use an inode here for this - that will push dirty
+ * state back up into the VFS and then periodic inode flushing
+ * will prevent log covering from making progress. Hence we
+ * synchronously log the superblock instead to ensure the
+ * superblock is immediately unpinned and can be written back.
+ */
+ xfs_sync_sb(mp, true);
+ } else
xfs_log_force(mp, 0);
/* start pushing all the metadata that is currently dirty */