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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: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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1 changed files with 4 additions and 3 deletions
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@ -615,9 +615,10 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)
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for (i = 0; i < found; i++) {
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struct extent_tree *et = treevec[i];
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write_lock(&et->lock);
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node_cnt += __free_extent_tree(sbi, et, false);
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write_unlock(&et->lock);
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if (write_trylock(&et->lock)) {
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node_cnt += __free_extent_tree(sbi, et, false);
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write_unlock(&et->lock);
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}
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if (node_cnt + tree_cnt >= nr_shrink)
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goto unlock_out;
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