From fce2a4e6b2da1bcc03837aff53b5bcb02bee4cee Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Mon, 6 Oct 2014 22:14:23 +0100 Subject: [PATCH] Btrfs: fix hang on compressed write error In inode.c:submit_compressed_extents(), before calling btrfs_submit_compressed_write() we start writeback for all pages, clear their dirty flag, unlock them, etc, but if btrfs_submit_compressed_write() fails (at the moment it can only fail with -ENOMEM), we never end the writeback on the pages, so any filemap_fdatawait_range() call will hang forever. We were also not calling the writepage end io hook, which means the corresponding ordered extent will never complete and all its waiters will block forever, such as a full fsync (via btrfs_wait_ordered_range()). Signed-off-by: Filipe Manana Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index fcb9a38..ec68eaef 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -814,6 +814,20 @@ retry: ins.objectid, ins.offset, async_extent->pages, async_extent->nr_pages); + if (ret) { + struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; + struct page *p = async_extent->pages[0]; + const u64 start = async_extent->start; + const u64 end = start + async_extent->ram_size - 1; + + p->mapping = inode->i_mapping; + tree->ops->writepage_end_io_hook(p, start, end, + NULL, 0); + p->mapping = NULL; + extent_clear_unlock_delalloc(inode, start, end, NULL, 0, + PAGE_END_WRITEBACK | + PAGE_SET_ERROR); + } alloc_hint = ins.objectid + ins.offset; kfree(async_extent); if (ret) -- 2.7.4