From 510671d2d83668b76c08baec5faa2319ceaffd62 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 18 Feb 2022 10:03:28 -0500 Subject: btrfs: do not try to repair bio that has no mirror set If we fail to submit a bio for whatever reason, we may not have setup a mirror_num for that bio. This means we shouldn't try to do the repair workflow, if we do we'll hit an BUG_ON(!failrec->this_mirror) in clean_io_failure. Instead simply skip the repair workflow if we have no mirror set, and add an assert to btrfs_check_repairable() to make it easier to catch what is happening in the future. Reviewed-by: Boris Burkov Signed-off-by: Josef Bacik Signed-off-by: David Sterba --- fs/btrfs/extent_io.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'fs/btrfs') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 13155e57e8c2..6a095e996221 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2610,6 +2610,7 @@ static bool btrfs_check_repairable(struct inode *inode, * a good copy of the failed sector and if we succeed, we have setup * everything for repair_io_failure to do the rest for us. */ + ASSERT(failed_mirror); failrec->failed_mirror = failed_mirror; failrec->this_mirror++; if (failrec->this_mirror == failed_mirror) @@ -3067,6 +3068,14 @@ static void end_bio_extent_readpage(struct bio *bio) goto readpage_ok; if (is_data_inode(inode)) { + /* + * If we failed to submit the IO at all we'll have a + * mirror_num == 0, in which case we need to just mark + * the page with an error and unlock it and carry on. + */ + if (mirror == 0) + goto readpage_ok; + /* * btrfs_submit_read_repair() will handle all the good * and bad sectors, we just continue to the next bvec. -- cgit v1.2.3