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xfs: bugfixes for 3.7-rc7

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- fix attr tree double split corruption
 - fix broken error handling in xfs_vm_writepage
 - drop buffer io reference when a bad bio is built
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Merge tag 'for-linus-v3.7-rc7' of git://oss.sgi.com/xfs/xfs

Pull xfs bugfixes from Ben Myers:

 - fix attr tree double split corruption

 - fix broken error handling in xfs_vm_writepage

 - drop buffer io reference when a bad bio is built

* tag 'for-linus-v3.7-rc7' of git://oss.sgi.com/xfs/xfs:
  xfs: drop buffer io reference when a bad bio is built
  xfs: fix broken error handling in xfs_vm_writepage
  xfs: fix attr tree double split corruption
This commit is contained in:
Linus Torvalds 2012-11-18 08:29:34 -10:00
commit d28d3730fd
3 changed files with 69 additions and 19 deletions
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54
fs/xfs/xfs_aops.c
View File

@ -481,11 +481,17 @@ static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh)
*
* The fix is two passes across the ioend list - one to start writeback on the
* buffer_heads, and then submit them for I/O on the second pass.
*
* If @fail is non-zero, it means that we have a situation where some part of
* the submission process has failed after we have marked paged for writeback
* and unlocked them. In this situation, we need to fail the ioend chain rather
* than submit it to IO. This typically only happens on a filesystem shutdown.
*/
STATIC void
xfs_submit_ioend(
struct writeback_control *wbc,
xfs_ioend_t *ioend)
xfs_ioend_t *ioend,
int fail)
{
xfs_ioend_t *head = ioend;
xfs_ioend_t *next;
@ -506,6 +512,18 @@ xfs_submit_ioend(
next = ioend->io_list;
bio = NULL;
/*
* If we are failing the IO now, just mark the ioend with an
* error and finish it. This will run IO completion immediately
* as there is only one reference to the ioend at this point in
* time.
*/
if (fail) {
ioend->io_error = -fail;
xfs_finish_ioend(ioend);
continue;
}
for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) {
if (!bio) {
@ -1060,7 +1078,18 @@ xfs_vm_writepage(
xfs_start_page_writeback(page, 1, count);
if (ioend && imap_valid) {
/* if there is no IO to be submitted for this page, we are done */
if (!ioend)
return 0;
ASSERT(iohead);
/*
* Any errors from this point onwards need tobe reported through the IO
* completion path as we have marked the initial page as under writeback
* and unlocked it.
*/
if (imap_valid) {
xfs_off_t end_index;
end_index = imap.br_startoff + imap.br_blockcount;
@ -1079,20 +1108,15 @@ xfs_vm_writepage(
wbc, end_index);
}
if (iohead) {
/*
* Reserve log space if we might write beyond the on-disk
* inode size.
*/
if (ioend->io_type != XFS_IO_UNWRITTEN &&
xfs_ioend_is_append(ioend)) {
err = xfs_setfilesize_trans_alloc(ioend);
if (err)
goto error;
}
xfs_submit_ioend(wbc, iohead);
}
/*
* Reserve log space if we might write beyond the on-disk inode size.
*/
err = 0;
if (ioend->io_type != XFS_IO_UNWRITTEN && xfs_ioend_is_append(ioend))
err = xfs_setfilesize_trans_alloc(ioend);
xfs_submit_ioend(wbc, iohead, err);
return 0;

20
fs/xfs/xfs_attr_leaf.c
View File

@ -1291,6 +1291,7 @@ xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
leaf2 = blk2->bp->b_addr;
ASSERT(leaf1->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
ASSERT(leaf2->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
ASSERT(leaf2->hdr.count == 0);
args = state->args;
trace_xfs_attr_leaf_rebalance(args);
@ -1361,6 +1362,7 @@ xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
* I assert that since all callers pass in an empty
* second buffer, this code should never execute.
*/
ASSERT(0);
/*
* Figure the total bytes to be added to the destination leaf.
@ -1422,10 +1424,24 @@ xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
args->index2 = 0;
args->blkno2 = blk2->blkno;
} else {
/*
* On a double leaf split, the original attr location
* is already stored in blkno2/index2, so don't
* overwrite it overwise we corrupt the tree.
*/
blk2->index = blk1->index
- be16_to_cpu(leaf1->hdr.count);
args->index = args->index2 = blk2->index;
args->blkno = args->blkno2 = blk2->blkno;
args->index = blk2->index;
args->blkno = blk2->blkno;
if (!state->extravalid) {
/*
* set the new attr location to match the old
* one and let the higher level split code
* decide where in the leaf to place it.
*/
args->index2 = blk2->index;
args->blkno2 = blk2->blkno;
}
}
} else {
ASSERT(state->inleaf == 1);

14
fs/xfs/xfs_buf.c
View File

@ -1197,9 +1197,14 @@ xfs_buf_bio_end_io(
{
xfs_buf_t *bp = (xfs_buf_t *)bio->bi_private;
xfs_buf_ioerror(bp, -error);
/*
* don't overwrite existing errors - otherwise we can lose errors on
* buffers that require multiple bios to complete.
*/
if (!bp->b_error)
xfs_buf_ioerror(bp, -error);
if (!error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ))
if (!bp->b_error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ))
invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp));
_xfs_buf_ioend(bp, 1);
@ -1279,6 +1284,11 @@ next_chunk:
if (size)
goto next_chunk;
} else {
/*
* This is guaranteed not to be the last io reference count
* because the caller (xfs_buf_iorequest) holds a count itself.
*/
atomic_dec(&bp->b_io_remaining);
xfs_buf_ioerror(bp, EIO);
bio_put(bio);
}