From: Naohiro Aota Date: Fri, 1 Sep 2017 08:59:07 +0000 (+0900) Subject: btrfs: finish ordered extent cleaning if no progress is found X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=67c003f90fd68062d92a7ffade36f9b2a9098bd8;p=openwrt%2Fstaging%2Fblogic.git btrfs: finish ordered extent cleaning if no progress is found __endio_write_update_ordered() repeats the search until it reaches the end of the specified range. This works well with direct IO path, because before the function is called, it's ensured that there are ordered extents filling whole the range. It's not the case, however, when it's called from run_delalloc_range(): it is possible to have error in the midle of the loop in e.g. run_delalloc_nocow(), so that there exisits the range not covered by any ordered extents. By cleaning such "uncomplete" range, __endio_write_update_ordered() stucks at offset where there're no ordered extents. Since the ordered extents are created from head to tail, we can stop the search if there are no offset progress. Fixes: 524272607e88 ("btrfs: Handle delalloc error correctly to avoid ordered extent hang") Cc: # 4.12 Signed-off-by: Naohiro Aota Reviewed-by: Qu Wenruo Reviewed-by: Josef Bacik Signed-off-by: David Sterba --- diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 455c0f22fe2d..f78c5640c6dc 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -8396,6 +8396,7 @@ static void __endio_write_update_ordered(struct inode *inode, btrfs_work_func_t func; u64 ordered_offset = offset; u64 ordered_bytes = bytes; + u64 last_offset; int ret; if (btrfs_is_free_space_inode(BTRFS_I(inode))) { @@ -8407,6 +8408,7 @@ static void __endio_write_update_ordered(struct inode *inode, } again: + last_offset = ordered_offset; ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, &ordered_offset, ordered_bytes, @@ -8417,6 +8419,12 @@ again: btrfs_init_work(&ordered->work, func, finish_ordered_fn, NULL, NULL); btrfs_queue_work(wq, &ordered->work); out_test: + /* + * If btrfs_dec_test_ordered_pending does not find any ordered extent + * in the range, we can exit. + */ + if (ordered_offset == last_offset) + return; /* * our bio might span multiple ordered extents. If we haven't * completed the accounting for the whole dio, go back and try again