On 31/10/2024 14:44, Johannes Thumshirn wrote:
From: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Now that bio_split() can return errors, add error handling for it in
btrfs_split_bio() and ultimately btrfs_submit_chunk().
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
---
This is based on top of John Garry's series "bio_split() error handling
rework" explicitly on the patch titled "block: Rework bio_split() return
value", which are as of now (Tue Oct 29 10:02:16 2024) not yet merged into
any tree.
Changes to v1:
- convert ERR_PTR to blk_status_t
- correctly fail already split bbios
---
fs/btrfs/bio.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c
index 1f216d07eff6..d2cfef5e4d4a 100644
--- a/fs/btrfs/bio.c
+++ b/fs/btrfs/bio.c
@@ -81,6 +81,9 @@ static struct btrfs_bio *btrfs_split_bio(struct btrfs_fs_info *fs_info,
bio = bio_split(&orig_bbio->bio, map_length >> SECTOR_SHIFT, GFP_NOFS,
&btrfs_clone_bioset);
+ if (IS_ERR(bio))
+ return ERR_CAST(bio);
+
bbio = btrfs_bio(bio);
btrfs_bio_init(bbio, fs_info, NULL, orig_bbio);
bbio->inode = orig_bbio->inode;
@@ -687,6 +690,10 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
if (map_length < length) {
bbio = btrfs_split_bio(fs_info, bbio, map_length);
+ if (IS_ERR(bbio)) {
+ ret = errno_to_blk_status(PTR_ERR(bbio));
btrfs_split_bio() does splitting, but error means "goto fail". However
other failure points "goto fail_split". I find that label naming odd.
Furthermore, at "fail", we call btrfs_bio_end_io() and that function
dereferences bbio (which is -EINVAL or something like that)
Thanks,
John
+ goto fail;
+ }
bio = &bbio->bio;
}
@@ -698,7 +705,7 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
bbio->saved_iter = bio->bi_iter;
ret = btrfs_lookup_bio_sums(bbio);
if (ret)
- goto fail;
+ goto fail_split;
}
if (btrfs_op(bio) == BTRFS_MAP_WRITE) {
@@ -732,13 +739,13 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
ret = btrfs_bio_csum(bbio);
if (ret)
- goto fail;
+ goto fail_split;
} else if (use_append ||
(btrfs_is_zoned(fs_info) && inode &&
inode->flags & BTRFS_INODE_NODATASUM)) {
ret = btrfs_alloc_dummy_sum(bbio);
if (ret)
- goto fail;
+ goto fail_split;
}
}
@@ -746,7 +753,7 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
done:
return map_length == length;
-fail:
+fail_split:
btrfs_bio_counter_dec(fs_info);
/*
* We have split the original bbio, now we have to end both the current
@@ -760,6 +767,7 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
btrfs_bio_end_io(remaining, ret);
}
+fail:
btrfs_bio_end_io(bbio, ret);
/* Do not submit another chunk */
return true;
