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| author | Johannes Thumshirn <jthumshirn@suse.de> | 2019-02-25 16:24:16 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-04-29 20:02:17 +0300 |
| commit | c53839fc3217085c210e1a62022016f199ae7b5a (patch) | |
| tree | 9db7937e709abce92c0c4c92dbe13d34c4086e3f /fs/btrfs/disk-io.c | |
| parent | 2996e1f8bcadf0436cc67b63af01523f6cf5d43f (diff) | |
| download | linux-c53839fc3217085c210e1a62022016f199ae7b5a.tar.xz | |
btrfs: warn if extent buffer mapping crosses a page boundary in csum_tree_block
Since commit d2e174d5d3ee ("btrfs: document extent mapping assumptions in
checksum") we have a comment in place why map_private_extent_buffer()
can't return 1 in the csum_tree_block() case.
Make this a bit more explicit and WARN_ON() in case this this assumption
breaks.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 4f11a83304ae..c4404e1e9cfb 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -285,7 +285,7 @@ static int csum_tree_block(struct extent_buffer *buf, u8 *result) */ err = map_private_extent_buffer(buf, offset, 32, &kaddr, &map_start, &map_len); - if (err) + if (WARN_ON(err)) return err; cur_len = min(len, map_len - (offset - map_start)); crc = btrfs_csum_data(kaddr + offset - map_start, |