AcoSail/kernel_optimize_test
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Btrfs: fix deadlock in run_delalloc_nocow

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@cur_offset is not set back to what it should be (@cow_start) if
btrfs_next_leaf() returns something wrong, and the range [cow_start,
cur_offset) remains locked forever.

cc: <stable@vger.kernel.org>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2018-01-25 11:02:50 -07:00 committed by David Sterba
parent 3acbcbfc8f
commit e89166990f
1 changed files with 4 additions and 1 deletions
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5
fs/btrfs/inode.c
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@ -1334,8 +1334,11 @@ static noinline int run_delalloc_nocow(struct inode *inode,
leaf = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
if (ret < 0) {
if (cow_start != (u64)-1)
cur_offset = cow_start;
goto error;
}
if (ret > 0)
break;
leaf = path->nodes[0];