xfs: force summary counter recalc at next mount

Use the "bad summary count" mount flag from the previous patch to skip
writing the unmount record to force log recovery at the next mount,
which will recalculate the summary counters for us.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h
index b9974e7..66077a1 100644 (file)
--- a/fs/xfs/libxfs/xfs_errortag.h
+++ b/fs/xfs/libxfs/xfs_errortag.h
@@ -53,7 +53,8 @@
 #define XFS_ERRTAG_LOG_ITEM_PIN                                30
 #define XFS_ERRTAG_BUF_LRU_REF                         31
 #define XFS_ERRTAG_FORCE_SCRUB_REPAIR                  32
-#define XFS_ERRTAG_MAX                                 33
+#define XFS_ERRTAG_FORCE_SUMMARY_RECALC                        33
+#define XFS_ERRTAG_MAX                                 34
 
 /*
  * Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -91,5 +92,6 @@
 #define XFS_RANDOM_LOG_ITEM_PIN                                1
 #define XFS_RANDOM_BUF_LRU_REF                         2
 #define XFS_RANDOM_FORCE_SCRUB_REPAIR                  1
+#define XFS_RANDOM_FORCE_SUMMARY_RECALC                        1
 
 #endif /* __XFS_ERRORTAG_H_ */

diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index 0470114..9866f54 100644 (file)
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -50,6 +50,7 @@ static unsigned int xfs_errortag_random_default[] = {
        XFS_RANDOM_LOG_ITEM_PIN,
        XFS_RANDOM_BUF_LRU_REF,
        XFS_RANDOM_FORCE_SCRUB_REPAIR,
+       XFS_RANDOM_FORCE_SUMMARY_RECALC,
 };
 
 struct xfs_errortag_attr {
@@ -157,6 +158,7 @@ XFS_ERRORTAG_ATTR_RW(log_bad_crc,   XFS_ERRTAG_LOG_BAD_CRC);
 XFS_ERRORTAG_ATTR_RW(log_item_pin,     XFS_ERRTAG_LOG_ITEM_PIN);
 XFS_ERRORTAG_ATTR_RW(buf_lru_ref,      XFS_ERRTAG_BUF_LRU_REF);
 XFS_ERRORTAG_ATTR_RW(force_repair,     XFS_ERRTAG_FORCE_SCRUB_REPAIR);
+XFS_ERRORTAG_ATTR_RW(bad_summary,      XFS_ERRTAG_FORCE_SUMMARY_RECALC);
 
 static struct attribute *xfs_errortag_attrs[] = {
        XFS_ERRORTAG_ATTR_LIST(noerror),
@@ -192,6 +194,7 @@ static struct attribute *xfs_errortag_attrs[] = {
        XFS_ERRORTAG_ATTR_LIST(log_item_pin),
        XFS_ERRORTAG_ATTR_LIST(buf_lru_ref),
        XFS_ERRORTAG_ATTR_LIST(force_repair),
+       XFS_ERRORTAG_ATTR_LIST(bad_summary),
        NULL,
 };
 

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index bac586c..fd10b14 100644 (file)
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -848,16 +848,30 @@ xfs_log_write_unmount_record(
        struct xlog_in_core     *iclog;
        struct xlog_ticket      *tic = NULL;
        xfs_lsn_t               lsn;
+       uint                    flags = XLOG_UNMOUNT_TRANS;
        int                     error;
 
        error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0);
        if (error)
                goto out_err;
 
+       /*
+        * If we think the summary counters are bad, clear the unmount header
+        * flag in the unmount record so that the summary counters will be
+        * recalculated during log recovery at next mount.  Refer to
+        * xlog_check_unmount_rec for more details.
+        */
+       if (XFS_TEST_ERROR((mp->m_flags & XFS_MOUNT_BAD_SUMMARY), mp,
+                       XFS_ERRTAG_FORCE_SUMMARY_RECALC)) {
+               xfs_alert(mp, "%s: will fix summary counters at next mount",
+                               __func__);
+               flags &= ~XLOG_UNMOUNT_TRANS;
+       }
+
        /* remove inited flag, and account for space used */
        tic->t_flags = 0;
        tic->t_curr_res -= sizeof(magic);
-       error = xlog_write(log, &vec, tic, &lsn, NULL, XLOG_UNMOUNT_TRANS);
+       error = xlog_write(log, &vec, tic, &lsn, NULL, flags);
        /*
         * At this point, we're umounting anyway, so there's no point in
         * transitioning log state to IOERROR. Just continue...

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 60462c3..4fb361c 100644 (file)
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1423,3 +1423,16 @@ xfs_dev_is_read_only(
        }
        return 0;
 }
+
+/* Force the summary counters to be recalculated at next mount. */
+void
+xfs_force_summary_recalc(
+       struct xfs_mount        *mp)
+{
+       if (!xfs_sb_version_haslazysbcount(&mp->m_sb))
+               return;
+
+       spin_lock(&mp->m_sb_lock);
+       mp->m_flags |= XFS_MOUNT_BAD_SUMMARY;
+       spin_unlock(&mp->m_sb_lock);
+}

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index f08907d..540353a 100644 (file)
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -435,5 +435,6 @@ int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
 
 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
                int error_class, int error);
+void xfs_force_summary_recalc(struct xfs_mount *mp);
 
 #endif /* __XFS_MOUNT_H__ */