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| author | Lachlan McIlroy <lachlan@sgi.com> | 2006-09-07 14:27:05 +1000 |
|---|---|---|
| committer | David Chatterton <chatz@sgi.com> | 2006-09-07 14:27:05 +1000 |
| commit | 721259bce2851893155c6cb88a3f8ecb106b348c (patch) | |
| tree | 0db37f80a7ef0b701b313e9ba28f8c0d3950e533 /fs/xfs/linux-2.6 | |
| parent | 4be536debe3f7b0c62283e77fd6bd8bdb9f83c6f (diff) | |
| download | linux-721259bce2851893155c6cb88a3f8ecb106b348c.tar.gz linux-721259bce2851893155c6cb88a3f8ecb106b348c.tar.bz2 linux-721259bce2851893155c6cb88a3f8ecb106b348c.zip | |
[XFS] Fix ABBA deadlock between i_mutex and iolock. Avoid calling
__blockdev_direct_IO for the DIO_OWN_LOCKING case for direct I/O reads
since it drops and reacquires the i_mutex while holding the iolock and
this violates the locking order.
SGI-PV: 955696
SGI-Modid: xfs-linux-melb:xfs-kern:26898a
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: David Chatterton <chatz@sgi.com>
Diffstat (limited to 'fs/xfs/linux-2.6')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_aops.c | 18 | ||||
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_lrw.c | 11 |
2 files changed, 19 insertions, 10 deletions
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c index c40f81ba9b13..34dcb43a7837 100644 --- a/fs/xfs/linux-2.6/xfs_aops.c +++ b/fs/xfs/linux-2.6/xfs_aops.c @@ -1390,11 +1390,19 @@ xfs_vm_direct_IO( iocb->private = xfs_alloc_ioend(inode, IOMAP_UNWRITTEN); - ret = blockdev_direct_IO_own_locking(rw, iocb, inode, - iomap.iomap_target->bt_bdev, - iov, offset, nr_segs, - xfs_get_blocks_direct, - xfs_end_io_direct); + if (rw == WRITE) { + ret = blockdev_direct_IO_own_locking(rw, iocb, inode, + iomap.iomap_target->bt_bdev, + iov, offset, nr_segs, + xfs_get_blocks_direct, + xfs_end_io_direct); + } else { + ret = blockdev_direct_IO_no_locking(rw, iocb, inode, + iomap.iomap_target->bt_bdev, + iov, offset, nr_segs, + xfs_get_blocks_direct, + xfs_end_io_direct); + } if (unlikely(ret <= 0 && iocb->private)) xfs_destroy_ioend(iocb->private); diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c index 5d9cfd91ad08..110c038910ff 100644 --- a/fs/xfs/linux-2.6/xfs_lrw.c +++ b/fs/xfs/linux-2.6/xfs_lrw.c @@ -264,7 +264,9 @@ xfs_read( dmflags, &locktype); if (ret) { xfs_iunlock(ip, XFS_IOLOCK_SHARED); - goto unlock_mutex; + if (unlikely(ioflags & IO_ISDIRECT)) + mutex_unlock(&inode->i_mutex); + return ret; } } @@ -272,6 +274,9 @@ xfs_read( bhv_vop_flushinval_pages(vp, ctooff(offtoct(*offset)), -1, FI_REMAPF_LOCKED); + if (unlikely(ioflags & IO_ISDIRECT)) + mutex_unlock(&inode->i_mutex); + xfs_rw_enter_trace(XFS_READ_ENTER, &ip->i_iocore, (void *)iovp, segs, *offset, ioflags); ret = __generic_file_aio_read(iocb, iovp, segs, offset); @@ -281,10 +286,6 @@ xfs_read( XFS_STATS_ADD(xs_read_bytes, ret); xfs_iunlock(ip, XFS_IOLOCK_SHARED); - -unlock_mutex: - if (unlikely(ioflags & IO_ISDIRECT)) - mutex_unlock(&inode->i_mutex); return ret; } |