[XFS] Fix remount,readonly path to flush everything correctly.
The remount readonly path can fail to writeback properly because we still have active transactions after calling xfs_quiesce_fs(). Further investigation shows that this path is broken in the same ways that the xfs freeze path was broken so fix it the same way. SGI-PV: 964464 SGI-Modid: xfs-linux-melb:xfs-kern:28869a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Tim Shimmin <tes@sgi.com>
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@ -664,7 +664,7 @@ xfs_fs_sync_super(
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* occur here so don't bother flushing the buftarg (i.e
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* SYNC_QUIESCE) because it'll just get dirty again.
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*/
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flags = SYNC_FSDATA | SYNC_DELWRI | SYNC_WAIT | SYNC_IOWAIT;
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flags = SYNC_DATA_QUIESCE;
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} else
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flags = SYNC_FSDATA | (wait ? SYNC_WAIT : 0);
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@ -94,6 +94,20 @@ typedef enum {
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#define SYNC_IOWAIT 0x0100 /* wait for all I/O to complete */
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#define SYNC_SUPER 0x0200 /* flush superblock to disk */
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/*
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* When remounting a filesystem read-only or freezing the filesystem,
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* we have two phases to execute. This first phase is syncing the data
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* before we quiesce the fielsystem, and the second is flushing all the
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* inodes out after we've waited for all the transactions created by
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* the first phase to complete. The second phase uses SYNC_INODE_QUIESCE
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* to ensure that the inodes are written to their location on disk
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* rather than just existing in transactions in the log. This means
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* after a quiesce there is no log replay required to write the inodes
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* to disk (this is the main difference between a sync and a quiesce).
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*/
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#define SYNC_DATA_QUIESCE (SYNC_DELWRI|SYNC_FSDATA|SYNC_WAIT|SYNC_IOWAIT)
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#define SYNC_INODE_QUIESCE (SYNC_REMOUNT|SYNC_ATTR|SYNC_WAIT)
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#define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
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#define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
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#define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
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@ -640,7 +640,7 @@ xfs_quiesce_fs(
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* we can write the unmount record.
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*/
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do {
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xfs_syncsub(mp, SYNC_REMOUNT|SYNC_ATTR|SYNC_WAIT, NULL);
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xfs_syncsub(mp, SYNC_INODE_QUIESCE, NULL);
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pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
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if (!pincount) {
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delay(50);
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@ -651,6 +651,30 @@ xfs_quiesce_fs(
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return 0;
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}
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/*
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* Second stage of a quiesce. The data is already synced, now we have to take
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* care of the metadata. New transactions are already blocked, so we need to
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* wait for any remaining transactions to drain out before proceding.
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*/
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STATIC void
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xfs_attr_quiesce(
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xfs_mount_t *mp)
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{
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/* wait for all modifications to complete */
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while (atomic_read(&mp->m_active_trans) > 0)
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delay(100);
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/* flush inodes and push all remaining buffers out to disk */
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xfs_quiesce_fs(mp);
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ASSERT_ALWAYS(atomic_read(&mp->m_active_trans) == 0);
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/* Push the superblock and write an unmount record */
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xfs_log_sbcount(mp, 1);
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xfs_log_unmount_write(mp);
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xfs_unmountfs_writesb(mp);
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}
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STATIC int
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xfs_mntupdate(
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bhv_desc_t *bdp,
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@ -670,11 +694,8 @@ xfs_mntupdate(
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mp->m_flags &= ~XFS_MOUNT_BARRIER;
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}
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} else if (!(vfsp->vfs_flag & VFS_RDONLY)) { /* rw -> ro */
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bhv_vfs_sync(vfsp, SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR, NULL);
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xfs_quiesce_fs(mp);
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xfs_log_sbcount(mp, 1);
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xfs_log_unmount_write(mp);
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xfs_unmountfs_writesb(mp);
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bhv_vfs_sync(vfsp, SYNC_DATA_QUIESCE, NULL);
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xfs_attr_quiesce(mp);
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vfsp->vfs_flag |= VFS_RDONLY;
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}
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return 0;
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@ -1952,9 +1973,9 @@ xfs_showargs(
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}
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/*
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* Second stage of a freeze. The data is already frozen, now we have to take
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* care of the metadata. New transactions are already blocked, so we need to
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* wait for any remaining transactions to drain out before proceding.
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* Second stage of a freeze. The data is already frozen so we only
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* need to take care of themetadata. Once that's done write a dummy
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* record to dirty the log in case of a crash while frozen.
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*/
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STATIC void
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xfs_freeze(
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@ -1962,19 +1983,7 @@ xfs_freeze(
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{
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xfs_mount_t *mp = XFS_BHVTOM(bdp);
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/* wait for all modifications to complete */
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while (atomic_read(&mp->m_active_trans) > 0)
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delay(100);
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/* flush inodes and push all remaining buffers out to disk */
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xfs_quiesce_fs(mp);
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ASSERT_ALWAYS(atomic_read(&mp->m_active_trans) == 0);
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/* Push the superblock and write an unmount record */
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xfs_log_sbcount(mp, 1);
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xfs_log_unmount_write(mp);
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xfs_unmountfs_writesb(mp);
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xfs_attr_quiesce(mp);
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xfs_fs_log_dummy(mp);
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}
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