Commit 760de791 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: avoid deadlock in f2fs_shrink_extent_tree



While handling extent trees, we can enter into a reclaiming path anytime.
If it tries to release some extent nodes in the same extent tree,
write_lock(&et->lock) would be hanged.
In order to avoid the deadlock, we can just skip it.

Note that, if it is an unreferenced tree, we should get write_lock(&et->lock)
successfully and release all of therein nodes.
Reviewed-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 57b62d29
......@@ -615,9 +615,10 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)
for (i = 0; i < found; i++) {
struct extent_tree *et = treevec[i];
write_lock(&et->lock);
node_cnt += __free_extent_tree(sbi, et, false);
write_unlock(&et->lock);
if (write_trylock(&et->lock)) {
node_cnt += __free_extent_tree(sbi, et, false);
write_unlock(&et->lock);
}
if (node_cnt + tree_cnt >= nr_shrink)
goto unlock_out;
......
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