From a2a72fbd1110323b2008dcb3ed14494957341dfe Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Wed, 20 Mar 2019 14:27:48 +0800 Subject: [PATCH] btrfs: extent_io: Handle errors better in extent_writepages() We can only get <=0 from extent_write_cache_pages, add an ASSERT() for it just in case. Then instead of submitting the write bio even if we got some error, check the return value first. If we have already hit some error, just clean up the corrupted or half-baked bio, and return error. If there is no error so far, then call flush_write_bio() and return the result. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/extent_io.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 38dcac0a152e..e304d5f50c5a 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4104,7 +4104,6 @@ int extent_writepages(struct address_space *mapping, struct writeback_control *wbc) { int ret = 0; - int flush_ret; struct extent_page_data epd = { .bio = NULL, .tree = &BTRFS_I(mapping->host)->io_tree, @@ -4113,8 +4112,12 @@ int extent_writepages(struct address_space *mapping, }; ret = extent_write_cache_pages(mapping, wbc, &epd); - flush_ret = flush_write_bio(&epd); - BUG_ON(flush_ret < 0); + ASSERT(ret <= 0); + if (ret < 0) { + end_write_bio(&epd, ret); + return ret; + } + ret = flush_write_bio(&epd); return ret; } -- 2.11.0