diff options
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_super.c | 14 | ||||
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_vfs.h | 1 | ||||
| -rw-r--r-- | fs/xfs/xfs_vfsops.c | 26 |
3 files changed, 34 insertions, 7 deletions
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c index dab5d38..003e5f2 100644 --- a/fs/xfs/linux-2.6/xfs_super.c +++ b/fs/xfs/linux-2.6/xfs_super.c @@ -659,9 +659,17 @@ xfs_fs_sync_super( int error; int flags; - if (unlikely(sb->s_frozen == SB_FREEZE_WRITE)) - flags = SYNC_QUIESCE; - else + if (unlikely(sb->s_frozen == SB_FREEZE_WRITE)) { + /* + * First stage of freeze - no more writers will make progress + * now we are here, so we flush delwri and delalloc buffers + * here, then wait for all I/O to complete. Data is frozen at + * that point. Metadata is not frozen, transactions can still + * occur here so don't bother flushing the buftarg (i.e + * SYNC_QUIESCE) because it'll just get dirty again. + */ + flags = SYNC_FSDATA | SYNC_DELWRI | SYNC_WAIT | SYNC_DIO_WAIT; + } else flags = SYNC_FSDATA | (wait ? SYNC_WAIT : 0); error = bhv_vfs_sync(vfsp, flags, NULL); diff --git a/fs/xfs/linux-2.6/xfs_vfs.h b/fs/xfs/linux-2.6/xfs_vfs.h index da255bd..558823a 100644 --- a/fs/xfs/linux-2.6/xfs_vfs.h +++ b/fs/xfs/linux-2.6/xfs_vfs.h @@ -92,6 +92,7 @@ typedef enum { #define SYNC_REFCACHE 0x0040 /* prune some of the nfs ref cache */ #define SYNC_REMOUNT 0x0080 /* remount readonly, no dummy LRs */ #define SYNC_QUIESCE 0x0100 /* quiesce fileystem for a snapshot */ +#define SYNC_DIO_WAIT 0x0200 /* wait for direct I/O to complete */ #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */ #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */ diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c index f5ea74b..c2a6eab 100644 --- a/fs/xfs/xfs_vfsops.c +++ b/fs/xfs/xfs_vfsops.c @@ -872,6 +872,10 @@ xfs_statvfs( * this by simply making sure the log gets flushed * if SYNC_BDFLUSH is set, and by actually writing it * out otherwise. + * SYNC_DIO_WAIT - The caller wants us to wait for all direct I/Os + * as well to ensure all data I/O completes before we + * return. Forms the drain side of the write barrier needed + * to safely quiesce the filesystem. * */ /*ARGSUSED*/ @@ -883,10 +887,7 @@ xfs_sync( { xfs_mount_t *mp = XFS_BHVTOM(bdp); - if (unlikely(flags == SYNC_QUIESCE)) - return xfs_quiesce_fs(mp); - else - return xfs_syncsub(mp, flags, NULL); + return xfs_syncsub(mp, flags, NULL); } /* @@ -1172,6 +1173,12 @@ xfs_sync_inodes( } } + /* + * When freezing, we need to wait ensure direct I/O is complete + * as well to ensure all data modification is complete here + */ + if (flags & SYNC_DIO_WAIT) + vn_iowait(vp); if (flags & SYNC_BDFLUSH) { if ((flags & SYNC_ATTR) && @@ -1950,15 +1957,26 @@ xfs_showargs( return 0; } +/* + * Second stage of a freeze. The data is already frozen, now we have to take + * care of the metadata. New transactions are already blocked, so we need to + * wait for any remaining transactions to drain out before proceding. + */ STATIC void xfs_freeze( bhv_desc_t *bdp) { xfs_mount_t *mp = XFS_BHVTOM(bdp); + /* wait for all modifications to complete */ while (atomic_read(&mp->m_active_trans) > 0) delay(100); + /* flush inodes and push all remaining buffers out to disk */ + xfs_quiesce_fs(mp); + + BUG_ON(atomic_read(&mp->m_active_trans) > 0); + /* Push the superblock and write an unmount record */ xfs_log_unmount_write(mp); xfs_unmountfs_writesb(mp); |