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xfs: use ->t_dfops in cancel cow blocks operation

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Use ->t_dfops of the transaction from the caller. Reset it before we
return to avoid leaks of local stack memory.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Brian Foster 2018-07-11 22:26:18 -07:00 committed by Darrick J. Wong
parent 7a7943c7e0
commit 27356a063a
1 changed files with 8 additions and 6 deletions
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14
fs/xfs/xfs_reflink.c
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@ -490,6 +490,7 @@ xfs_reflink_cancel_cow_blocks(
struct xfs_iext_cursor icur;
xfs_fsblock_t firstfsb;
struct xfs_defer_ops dfops;
struct xfs_defer_ops *odfops = (*tpp)->t_dfops;
int error = 0;
if (!xfs_is_reflink_inode(ip))
@ -517,23 +518,24 @@ xfs_reflink_cancel_cow_blocks(
break;
} else if (del.br_state == XFS_EXT_UNWRITTEN || cancel_real) {
xfs_defer_init(&dfops, &firstfsb);
(*tpp)->t_dfops = &dfops;
/* Free the CoW orphan record. */
error = xfs_refcount_free_cow_extent(ip->i_mount,
&dfops, del.br_startblock,
(*tpp)->t_dfops, del.br_startblock,
del.br_blockcount);
if (error)
break;
xfs_bmap_add_free(ip->i_mount, &dfops,
xfs_bmap_add_free(ip->i_mount, (*tpp)->t_dfops,
del.br_startblock, del.br_blockcount,
NULL);
/* Roll the transaction */
xfs_defer_ijoin(&dfops, ip);
error = xfs_defer_finish(tpp, &dfops);
xfs_defer_ijoin((*tpp)->t_dfops, ip);
error = xfs_defer_finish(tpp, (*tpp)->t_dfops);
if (error) {
xfs_defer_cancel(&dfops);
xfs_defer_cancel((*tpp)->t_dfops);
break;
}
@ -558,7 +560,7 @@ next_extent:
/* clear tag if cow fork is emptied */
if (!ifp->if_bytes)
xfs_inode_clear_cowblocks_tag(ip);
(*tpp)->t_dfops = odfops;
return error;
}