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Btrfs: deal with bad mappings in btrfs_map_block

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Martin Steigerwald reported a BUG_ON() in btrfs_map_block where we didn't find
a chunk for a particular block we were trying to map.  This happened because the
block was bogus.  We shouldn't be BUG_ON()'ing in this case, just print a
message and return an error.  This came from reada_add_block and it appears to
deal with an error fine so we should be good there.  Thanks,

Reported-by: Martin Steigerwald <Martin@lichtvoll.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-04-19 23:45:33 -04:00
parent d4c7ca86b5
commit 9bb91873e3
1 changed files with 8 additions and 2 deletions
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10
fs/btrfs/volumes.c
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@ -4406,10 +4406,16 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
btrfs_crit(fs_info, "unable to find logical %llu len %llu",
(unsigned long long)logical,
(unsigned long long)*length);
BUG();
return -EINVAL;
}
if (em->start > logical || em->start + em->len < logical) {
btrfs_crit(fs_info, "found a bad mapping, wanted %Lu, "
"found %Lu-%Lu\n", logical, em->start,
em->start + em->len);
return -EINVAL;
}
BUG_ON(em->start > logical || em->start + em->len < logical);
map = (struct map_lookup *)em->bdev;
offset = logical - em->start;