From 2b952eea813b1f7e7d4b9782271acd91625b9bb9 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Wed, 20 Mar 2019 14:27:43 +0800 Subject: [PATCH] btrfs: extent_io: Handle errors better in btree_write_cache_pages() In btree_write_cache_pages(), we can only get @ret <= 0. Add an ASSERT() for it just in case. Then instead of submitting the write bio even 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 9d52f3b..8399fc4 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3748,7 +3748,6 @@ int btree_write_cache_pages(struct address_space *mapping, .sync_io = wbc->sync_mode == WB_SYNC_ALL, }; int ret = 0; - int flush_ret; int done = 0; int nr_to_write_done = 0; struct pagevec pvec; @@ -3848,8 +3847,12 @@ retry: index = 0; goto retry; } - 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; } -- 2.7.4