When checksumming the encrypted bio on writes we need to know which
logical address this checksum is for. At the point where we get the
encrypted bio the bi_sector is the physical location on the target disk,
so we need to save the original logical offset in the btrfs_bio. Then
we can use this when csum'ing the bio instead of the
bio->iter.bi_sector.
Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
---
fs/btrfs/bio.c | 10 ++++++++++
fs/btrfs/bio.h | 3 +++
fs/btrfs/file-item.c | 2 +-
3 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c
index 90e4d4709fa3..52f027877aaa 100644
--- a/fs/btrfs/bio.c
+++ b/fs/btrfs/bio.c
@@ -96,6 +96,8 @@ static struct btrfs_bio *btrfs_split_bio(struct btrfs_fs_info *fs_info,
if (bbio_has_ordered_extent(bbio)) {
refcount_inc(&orig_bbio->ordered->refs);
bbio->ordered = orig_bbio->ordered;
+ bbio->orig_logical = orig_bbio->orig_logical;
+ orig_bbio->orig_logical += map_length;
}
atomic_inc(&orig_bbio->pending_ios);
return bbio;
@@ -674,6 +676,14 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
goto fail;
}
+ /*
+ * For fscrypt writes we will get the encrypted bio after we've remapped
+ * our bio to the physical disk location, so we need to save the
+ * original bytenr so we know what we're checksumming.
+ */
+ if (bio_op(bio) == REQ_OP_WRITE && is_data_bbio(bbio))
+ bbio->orig_logical = logical;
+
map_length = min(map_length, length);
if (use_append)
map_length = min(map_length, fs_info->max_zone_append_size);
diff --git a/fs/btrfs/bio.h b/fs/btrfs/bio.h
index ca79decee060..5d3f53dcd6d5 100644
--- a/fs/btrfs/bio.h
+++ b/fs/btrfs/bio.h
@@ -54,11 +54,14 @@ struct btrfs_bio {
* - pointer to the checksums for this bio
* - original physical address from the allocator
* (for zone append only)
+ * - original logical address, used for checksumming fscrypt
+ * bios.
*/
struct {
struct btrfs_ordered_extent *ordered;
struct btrfs_ordered_sum *sums;
u64 orig_physical;
+ u64 orig_logical;
};
/* For metadata reads: parentness verification. */
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index d925d6d98bf4..26e3bc602655 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -756,7 +756,7 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_bio *bbio, struct bio *bio)
sums->len = bio->bi_iter.bi_size;
INIT_LIST_HEAD(&sums->list);
- sums->logical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
+ sums->logical = bbio->orig_logical;
index = 0;
shash->tfm = fs_info->csum_shash;
--
2.41.0
