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xfs: Convert to new freezing code

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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>
This commit is contained in:
Jan Kara
2012-06-12 16:20:39 +02:00
committed by Al Viro
parent 8e8ad8a57c
commit d9457dc056
10 changed files with 109 additions and 16 deletions
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10
fs/xfs/xfs_file.c
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@@ -781,10 +781,12 @@ xfs_file_aio_write(
if (ocount == 0)
return 0;
xfs_wait_for_freeze(ip->i_mount, SB_FREEZE_WRITE);
sb_start_write(inode->i_sb);
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return -EIO;
if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
ret = -EIO;
goto out;
}
if (unlikely(file->f_flags & O_DIRECT))
ret = xfs_file_dio_aio_write(iocb, iovp, nr_segs, pos, ocount);
@@ -803,6 +805,8 @@ xfs_file_aio_write(
ret = err;
}
out:
sb_end_write(inode->i_sb);
return ret;
}