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[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>
This commit is contained in:
Lachlan McIlroy 2006-09-07 14:27:05 +10:00 committed by David Chatterton
parent 4be536debe
commit 721259bce2
2 changed files with 19 additions and 10 deletions
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18
fs/xfs/linux-2.6/xfs_aops.c
View File

@ -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);

11
fs/xfs/linux-2.6/xfs_lrw.c
View File

@ -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;
}