diff options
| author | Jan Kara <jack@suse.cz> | 2012-06-12 16:20:39 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-07-31 09:45:48 +0400 |
| commit | d9457dc056249913a7abe8b71dc09e427e590e35 (patch) | |
| tree | 8f0c6681d4c5802a6f5a124111b9d3958f0b281b /fs/xfs/xfs_trans.c | |
| parent | 8e8ad8a57c75f3bda2d03a4c4396a9a7024ad275 (diff) | |
| download | lwn-d9457dc056249913a7abe8b71dc09e427e590e35.tar.gz lwn-d9457dc056249913a7abe8b71dc09e427e590e35.zip | |
xfs: Convert to new freezing code
Generic code now blocks all writers from standard write paths. So we add
blocking of all writers coming from ioctl (we get a protection of ioctl against
racing remount read-only as a bonus) and convert xfs_file_aio_write() to a
non-racy freeze protection. We also keep freeze protection on transaction
start to block internal filesystem writes such as removal of preallocated
blocks.
CC: Ben Myers <bpm@sgi.com>
CC: Alex Elder <elder@kernel.org>
CC: xfs@oss.sgi.com
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/xfs/xfs_trans.c')
| -rw-r--r-- | fs/xfs/xfs_trans.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c index fdf324508c5e..06ed520a767f 100644 --- a/fs/xfs/xfs_trans.c +++ b/fs/xfs/xfs_trans.c @@ -576,8 +576,12 @@ xfs_trans_alloc( xfs_mount_t *mp, uint type) { - xfs_wait_for_freeze(mp, SB_FREEZE_TRANS); - return _xfs_trans_alloc(mp, type, KM_SLEEP); + xfs_trans_t *tp; + + sb_start_intwrite(mp->m_super); + tp = _xfs_trans_alloc(mp, type, KM_SLEEP); + tp->t_flags |= XFS_TRANS_FREEZE_PROT; + return tp; } xfs_trans_t * @@ -588,6 +592,7 @@ _xfs_trans_alloc( { xfs_trans_t *tp; + WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE); atomic_inc(&mp->m_active_trans); tp = kmem_zone_zalloc(xfs_trans_zone, memflags); @@ -611,6 +616,8 @@ xfs_trans_free( xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false); atomic_dec(&tp->t_mountp->m_active_trans); + if (tp->t_flags & XFS_TRANS_FREEZE_PROT) + sb_end_intwrite(tp->t_mountp->m_super); xfs_trans_free_dqinfo(tp); kmem_zone_free(xfs_trans_zone, tp); } @@ -643,7 +650,11 @@ xfs_trans_dup( ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); ASSERT(tp->t_ticket != NULL); - ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE); + ntp->t_flags = XFS_TRANS_PERM_LOG_RES | + (tp->t_flags & XFS_TRANS_RESERVE) | + (tp->t_flags & XFS_TRANS_FREEZE_PROT); + /* We gave our writer reference to the new transaction */ + tp->t_flags &= ~XFS_TRANS_FREEZE_PROT; ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket); ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used; tp->t_blk_res = tp->t_blk_res_used; |