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_aops.c | |
| parent | 8e8ad8a57c75f3bda2d03a4c4396a9a7024ad275 (diff) | |
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_aops.c')
| -rw-r--r-- | fs/xfs/xfs_aops.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 8dad722c004..daa42383ebd 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -124,6 +124,12 @@ xfs_setfilesize_trans_alloc( ioend->io_append_trans = tp; /* + * We will pass freeze protection with a transaction. So tell lockdep + * we released it. + */ + rwsem_release(&ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], + 1, _THIS_IP_); + /* * We hand off the transaction to the completion thread now, so * clear the flag here. */ @@ -199,6 +205,15 @@ xfs_end_io( struct xfs_inode *ip = XFS_I(ioend->io_inode); int error = 0; + if (ioend->io_append_trans) { + /* + * We've got freeze protection passed with the transaction. + * Tell lockdep about it. + */ + rwsem_acquire_read( + &ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], + 0, 1, _THIS_IP_); + } if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { ioend->io_error = -EIO; goto done; @@ -1410,6 +1425,9 @@ out_trans_cancel: if (ioend->io_append_trans) { current_set_flags_nested(&ioend->io_append_trans->t_pflags, PF_FSTRANS); + rwsem_acquire_read( + &inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], + 0, 1, _THIS_IP_); xfs_trans_cancel(ioend->io_append_trans, 0); } out_destroy_ioend: |