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| author | Josef Bacik <jbacik@fusionio.com> | 2013-04-19 23:45:33 -0400 |
|---|---|---|
| committer | Josef Bacik <jbacik@fusionio.com> | 2013-05-06 15:55:02 -0400 |
| commit | 9bb91873e32af6305a1c5239024674e4a5a97e92 (patch) | |
| tree | e31655e36122970005ac8790aa3eaeb5fc82e992 | |
| parent | d4c7ca86b59400cdab645b9a974a6ca4ec2f9f62 (diff) | |
| download | linux-3.10-9bb91873e32af6305a1c5239024674e4a5a97e92.tar.gz linux-3.10-9bb91873e32af6305a1c5239024674e4a5a97e92.tar.bz2 linux-3.10-9bb91873e32af6305a1c5239024674e4a5a97e92.zip | |
Btrfs: deal with bad mappings in btrfs_map_block
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>
| -rw-r--r-- | fs/btrfs/volumes.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 76ded9eb77a..c8a315d4b86 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -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; |