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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 <boris@bur.io>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2022-02-18 10:03:28 -05:00 committed by David Sterba
parent f9f15de85d
commit 510671d2d8
1 changed files with 9 additions and 0 deletions
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9
fs/btrfs/extent_io.c
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@ -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.