fs/btrfs/bio.c | 7 +++++++ 1 file changed, 7 insertions(+)
From: Johannes Thumshirn <johannes.thumshirn@wdc.com>
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@wdc.com>
---
John,
in case you have to send a v3, can you please include this one in your series?
fs/btrfs/bio.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c
index 1f216d07eff6..96cacd5c03a5 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 = PTR_ERR(bbio);
+ goto fail;
+ }
bio = &bbio->bio;
}
--
2.43.0Hi Johannes,
kernel test robot noticed the following build warnings:
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Johannes-Thumshirn/btrfs-handle-bio_split-error/20241029-171227
base: https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
patch link: https://lore.kernel.org/r/20241029091121.16281-1-jth%40kernel.org
patch subject: [PATCH] btrfs: handle bio_split() error
config: openrisc-randconfig-r072-20241030 (https://download.01.org/0day-ci/archive/20241031/202410310231.WMcRwBhG-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 14.1.0
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
| Closes: https://lore.kernel.org/r/202410310231.WMcRwBhG-lkp@intel.com/
smatch warnings:
fs/btrfs/bio.c:763 btrfs_submit_chunk() error: 'bbio' dereferencing possible ERR_PTR()
vim +/bbio +763 fs/btrfs/bio.c
ae42a154ca8972 Christoph Hellwig 2023-03-07 660 static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
103c19723c80bf Christoph Hellwig 2022-11-15 661 {
d5e4377d505189 Christoph Hellwig 2023-01-21 662 struct btrfs_inode *inode = bbio->inode;
4317ff0056bedf Qu Wenruo 2023-03-23 663 struct btrfs_fs_info *fs_info = bbio->fs_info;
ae42a154ca8972 Christoph Hellwig 2023-03-07 664 struct bio *bio = &bbio->bio;
adbe7e388e4239 Anand Jain 2023-04-15 665 u64 logical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
103c19723c80bf Christoph Hellwig 2022-11-15 666 u64 length = bio->bi_iter.bi_size;
103c19723c80bf Christoph Hellwig 2022-11-15 667 u64 map_length = length;
921603c76246a7 Christoph Hellwig 2022-12-12 668 bool use_append = btrfs_use_zone_append(bbio);
103c19723c80bf Christoph Hellwig 2022-11-15 669 struct btrfs_io_context *bioc = NULL;
103c19723c80bf Christoph Hellwig 2022-11-15 670 struct btrfs_io_stripe smap;
9ba0004bd95e05 Christoph Hellwig 2023-01-21 671 blk_status_t ret;
9ba0004bd95e05 Christoph Hellwig 2023-01-21 672 int error;
103c19723c80bf Christoph Hellwig 2022-11-15 673
f4d39cf1cebfb8 Johannes Thumshirn 2024-07-31 674 if (!bbio->inode || btrfs_is_data_reloc_root(inode->root))
f4d39cf1cebfb8 Johannes Thumshirn 2024-07-31 675 smap.rst_search_commit_root = true;
f4d39cf1cebfb8 Johannes Thumshirn 2024-07-31 676 else
f4d39cf1cebfb8 Johannes Thumshirn 2024-07-31 677 smap.rst_search_commit_root = false;
9acaa64187f9b4 Johannes Thumshirn 2023-09-14 678
103c19723c80bf Christoph Hellwig 2022-11-15 679 btrfs_bio_counter_inc_blocked(fs_info);
cd4efd210edfb3 Christoph Hellwig 2023-05-31 680 error = btrfs_map_block(fs_info, btrfs_op(bio), logical, &map_length,
9fb2acc2fe07f1 Qu Wenruo 2023-09-17 681 &bioc, &smap, &mirror_num);
9ba0004bd95e05 Christoph Hellwig 2023-01-21 682 if (error) {
9ba0004bd95e05 Christoph Hellwig 2023-01-21 683 ret = errno_to_blk_status(error);
9ba0004bd95e05 Christoph Hellwig 2023-01-21 684 goto fail;
103c19723c80bf Christoph Hellwig 2022-11-15 685 }
103c19723c80bf Christoph Hellwig 2022-11-15 686
852eee62d31abd Christoph Hellwig 2023-01-21 687 map_length = min(map_length, length);
d5e4377d505189 Christoph Hellwig 2023-01-21 688 if (use_append)
b35243a447b9fe Christoph Hellwig 2024-08-26 689 map_length = btrfs_append_map_length(bbio, map_length);
d5e4377d505189 Christoph Hellwig 2023-01-21 690
103c19723c80bf Christoph Hellwig 2022-11-15 691 if (map_length < length) {
b35243a447b9fe Christoph Hellwig 2024-08-26 692 bbio = btrfs_split_bio(fs_info, bbio, map_length);
28c02a018d50ae Johannes Thumshirn 2024-10-29 693 if (IS_ERR(bbio)) {
28c02a018d50ae Johannes Thumshirn 2024-10-29 694 ret = PTR_ERR(bbio);
28c02a018d50ae Johannes Thumshirn 2024-10-29 695 goto fail;
We hit this goto. We know from the if statement that map_length < length.
28c02a018d50ae Johannes Thumshirn 2024-10-29 696 }
2cef0c79bb81d8 Christoph Hellwig 2023-03-07 697 bio = &bbio->bio;
103c19723c80bf Christoph Hellwig 2022-11-15 698 }
103c19723c80bf Christoph Hellwig 2022-11-15 699
1c2b3ee3b0ec4b Christoph Hellwig 2023-01-21 700 /*
1c2b3ee3b0ec4b Christoph Hellwig 2023-01-21 701 * Save the iter for the end_io handler and preload the checksums for
1c2b3ee3b0ec4b Christoph Hellwig 2023-01-21 702 * data reads.
1c2b3ee3b0ec4b Christoph Hellwig 2023-01-21 703 */
fbe960877b6f43 Christoph Hellwig 2023-05-31 704 if (bio_op(bio) == REQ_OP_READ && is_data_bbio(bbio)) {
0d3acb25e70d5f Christoph Hellwig 2023-01-21 705 bbio->saved_iter = bio->bi_iter;
1c2b3ee3b0ec4b Christoph Hellwig 2023-01-21 706 ret = btrfs_lookup_bio_sums(bbio);
1c2b3ee3b0ec4b Christoph Hellwig 2023-01-21 707 if (ret)
10d9d8c3512f16 Qu Wenruo 2024-08-17 708 goto fail;
1c2b3ee3b0ec4b Christoph Hellwig 2023-01-21 709 }
7276aa7d38255b Christoph Hellwig 2023-01-21 710
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 711 if (btrfs_op(bio) == BTRFS_MAP_WRITE) {
d5e4377d505189 Christoph Hellwig 2023-01-21 712 if (use_append) {
d5e4377d505189 Christoph Hellwig 2023-01-21 713 bio->bi_opf &= ~REQ_OP_WRITE;
d5e4377d505189 Christoph Hellwig 2023-01-21 714 bio->bi_opf |= REQ_OP_ZONE_APPEND;
69ccf3f4244abc Christoph Hellwig 2023-01-21 715 }
69ccf3f4244abc Christoph Hellwig 2023-01-21 716
02c372e1f016e5 Johannes Thumshirn 2023-09-14 717 if (is_data_bbio(bbio) && bioc &&
02c372e1f016e5 Johannes Thumshirn 2023-09-14 718 btrfs_need_stripe_tree_update(bioc->fs_info, bioc->map_type)) {
02c372e1f016e5 Johannes Thumshirn 2023-09-14 719 /*
02c372e1f016e5 Johannes Thumshirn 2023-09-14 720 * No locking for the list update, as we only add to
02c372e1f016e5 Johannes Thumshirn 2023-09-14 721 * the list in the I/O submission path, and list
02c372e1f016e5 Johannes Thumshirn 2023-09-14 722 * iteration only happens in the completion path, which
02c372e1f016e5 Johannes Thumshirn 2023-09-14 723 * can't happen until after the last submission.
02c372e1f016e5 Johannes Thumshirn 2023-09-14 724 */
02c372e1f016e5 Johannes Thumshirn 2023-09-14 725 btrfs_get_bioc(bioc);
02c372e1f016e5 Johannes Thumshirn 2023-09-14 726 list_add_tail(&bioc->rst_ordered_entry, &bbio->ordered->bioc_list);
02c372e1f016e5 Johannes Thumshirn 2023-09-14 727 }
02c372e1f016e5 Johannes Thumshirn 2023-09-14 728
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 729 /*
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 730 * Csum items for reloc roots have already been cloned at this
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 731 * point, so they are handled as part of the no-checksum case.
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 732 */
4317ff0056bedf Qu Wenruo 2023-03-23 733 if (inode && !(inode->flags & BTRFS_INODE_NODATASUM) &&
169aaaf2e0be61 Qu Wenruo 2024-06-14 734 !test_bit(BTRFS_FS_STATE_NO_DATA_CSUMS, &fs_info->fs_state) &&
d5e4377d505189 Christoph Hellwig 2023-01-21 735 !btrfs_is_data_reloc_root(inode->root)) {
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 736 if (should_async_write(bbio) &&
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 737 btrfs_wq_submit_bio(bbio, bioc, &smap, mirror_num))
852eee62d31abd Christoph Hellwig 2023-01-21 738 goto done;
103c19723c80bf Christoph Hellwig 2022-11-15 739
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 740 ret = btrfs_bio_csum(bbio);
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 741 if (ret)
10d9d8c3512f16 Qu Wenruo 2024-08-17 742 goto fail;
cebae292e0c32a Johannes Thumshirn 2024-06-07 743 } else if (use_append ||
cebae292e0c32a Johannes Thumshirn 2024-06-07 744 (btrfs_is_zoned(fs_info) && inode &&
cebae292e0c32a Johannes Thumshirn 2024-06-07 745 inode->flags & BTRFS_INODE_NODATASUM)) {
cbfce4c7fbde23 Christoph Hellwig 2023-05-24 746 ret = btrfs_alloc_dummy_sum(bbio);
cbfce4c7fbde23 Christoph Hellwig 2023-05-24 747 if (ret)
10d9d8c3512f16 Qu Wenruo 2024-08-17 748 goto fail;
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 749 }
103c19723c80bf Christoph Hellwig 2022-11-15 750 }
f8a53bb58ec7e2 Christoph Hellwig 2023-01-21 751
22b4ef50dc1d11 David Sterba 2024-08-27 752 btrfs_submit_bio(bio, bioc, &smap, mirror_num);
852eee62d31abd Christoph Hellwig 2023-01-21 753 done:
852eee62d31abd Christoph Hellwig 2023-01-21 754 return map_length == length;
9ba0004bd95e05 Christoph Hellwig 2023-01-21 755
9ba0004bd95e05 Christoph Hellwig 2023-01-21 756 fail:
9ba0004bd95e05 Christoph Hellwig 2023-01-21 757 btrfs_bio_counter_dec(fs_info);
10d9d8c3512f16 Qu Wenruo 2024-08-17 758 /*
10d9d8c3512f16 Qu Wenruo 2024-08-17 759 * We have split the original bbio, now we have to end both the current
10d9d8c3512f16 Qu Wenruo 2024-08-17 760 * @bbio and remaining one, as the remaining one will never be submitted.
10d9d8c3512f16 Qu Wenruo 2024-08-17 761 */
10d9d8c3512f16 Qu Wenruo 2024-08-17 762 if (map_length < length) {
10d9d8c3512f16 Qu Wenruo 2024-08-17 @763 struct btrfs_bio *remaining = bbio->private;
^^^^^^^^^^^^^
Error pointer dereference
10d9d8c3512f16 Qu Wenruo 2024-08-17 764
10d9d8c3512f16 Qu Wenruo 2024-08-17 765 ASSERT(bbio->bio.bi_pool == &btrfs_clone_bioset);
10d9d8c3512f16 Qu Wenruo 2024-08-17 766 ASSERT(remaining);
10d9d8c3512f16 Qu Wenruo 2024-08-17 767
9ca0e58cb752b0 Qu Wenruo 2024-08-24 768 btrfs_bio_end_io(remaining, ret);
10d9d8c3512f16 Qu Wenruo 2024-08-17 769 }
9ca0e58cb752b0 Qu Wenruo 2024-08-24 770 btrfs_bio_end_io(bbio, ret);
852eee62d31abd Christoph Hellwig 2023-01-21 771 /* Do not submit another chunk */
852eee62d31abd Christoph Hellwig 2023-01-21 772 return true;
852eee62d31abd Christoph Hellwig 2023-01-21 773 }
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
> 852eee62d31abd Christoph Hellwig 2023-01-21 687 map_length = min(map_length, length);
> d5e4377d505189 Christoph Hellwig 2023-01-21 688 if (use_append)
> b35243a447b9fe Christoph Hellwig 2024-08-26 689 map_length = btrfs_append_map_length(bbio, map_length);
> d5e4377d505189 Christoph Hellwig 2023-01-21 690
> 103c19723c80bf Christoph Hellwig 2022-11-15 691 if (map_length < length) {
> b35243a447b9fe Christoph Hellwig 2024-08-26 692 bbio = btrfs_split_bio(fs_info, bbio, map_length);
> 28c02a018d50ae Johannes Thumshirn 2024-10-29 693 if (IS_ERR(bbio)) {
> 28c02a018d50ae Johannes Thumshirn 2024-10-29 694 ret = PTR_ERR(bbio);
> 28c02a018d50ae Johannes Thumshirn 2024-10-29 695 goto fail;
>
> We hit this goto. We know from the if statement that map_length < length.
>
> 28c02a018d50ae Johannes Thumshirn 2024-10-29 696 }
> 2cef0c79bb81d8 Christoph Hellwig 2023-03-07 697 bio = &bbio->bio;
> 103c19723c80bf Christoph Hellwig 2022-11-15 698 }
> 103c19723c80bf Christoph Hellwig 2022-11-15 699
...
> 852eee62d31abd Christoph Hellwig 2023-01-21 753 done:
> 852eee62d31abd Christoph Hellwig 2023-01-21 754 return map_length == length;
> 9ba0004bd95e05 Christoph Hellwig 2023-01-21 755
> 9ba0004bd95e05 Christoph Hellwig 2023-01-21 756 fail:
> 9ba0004bd95e05 Christoph Hellwig 2023-01-21 757 btrfs_bio_counter_dec(fs_info);
> 10d9d8c3512f16 Qu Wenruo 2024-08-17 758 /*
> 10d9d8c3512f16 Qu Wenruo 2024-08-17 759 * We have split the original bbio, now we have to end both the current
> 10d9d8c3512f16 Qu Wenruo 2024-08-17 760 * @bbio and remaining one, as the remaining one will never be submitted.
> 10d9d8c3512f16 Qu Wenruo 2024-08-17 761 */
> 10d9d8c3512f16 Qu Wenruo 2024-08-17 762 if (map_length < length) {
> 10d9d8c3512f16 Qu Wenruo 2024-08-17 @763 struct btrfs_bio *remaining = bbio->private;
> ^^^^^^^^^^^^^
> Error pointer dereference
This analysis looks correct.
I want to send a new version of the bio_split() rework series this
morning, so I will not pick up this change for now.
John
Hi Johannes,
kernel test robot noticed the following build warnings:
[auto build test WARNING on kdave/for-next]
[also build test WARNING on linus/master v6.12-rc5 next-20241030]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Johannes-Thumshirn/btrfs-handle-bio_split-error/20241029-171227
base: https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
patch link: https://lore.kernel.org/r/20241029091121.16281-1-jth%40kernel.org
patch subject: [PATCH] btrfs: handle bio_split() error
config: x86_64-randconfig-121-20241030 (https://download.01.org/0day-ci/archive/20241030/202410302118.6igPxwWv-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241030/202410302118.6igPxwWv-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410302118.6igPxwWv-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
>> fs/btrfs/bio.c:694:29: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted blk_status_t [assigned] [usertype] ret @@ got long @@
fs/btrfs/bio.c:694:29: sparse: expected restricted blk_status_t [assigned] [usertype] ret
fs/btrfs/bio.c:694:29: sparse: got long
fs/btrfs/bio.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/xarray.h, ...):
include/linux/page-flags.h:237:46: sparse: sparse: self-comparison always evaluates to false
include/linux/page-flags.h:237:46: sparse: sparse: self-comparison always evaluates to false
vim +694 fs/btrfs/bio.c
659
660 static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
661 {
662 struct btrfs_inode *inode = bbio->inode;
663 struct btrfs_fs_info *fs_info = bbio->fs_info;
664 struct bio *bio = &bbio->bio;
665 u64 logical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
666 u64 length = bio->bi_iter.bi_size;
667 u64 map_length = length;
668 bool use_append = btrfs_use_zone_append(bbio);
669 struct btrfs_io_context *bioc = NULL;
670 struct btrfs_io_stripe smap;
671 blk_status_t ret;
672 int error;
673
674 if (!bbio->inode || btrfs_is_data_reloc_root(inode->root))
675 smap.rst_search_commit_root = true;
676 else
677 smap.rst_search_commit_root = false;
678
679 btrfs_bio_counter_inc_blocked(fs_info);
680 error = btrfs_map_block(fs_info, btrfs_op(bio), logical, &map_length,
681 &bioc, &smap, &mirror_num);
682 if (error) {
683 ret = errno_to_blk_status(error);
684 goto fail;
685 }
686
687 map_length = min(map_length, length);
688 if (use_append)
689 map_length = btrfs_append_map_length(bbio, map_length);
690
691 if (map_length < length) {
692 bbio = btrfs_split_bio(fs_info, bbio, map_length);
693 if (IS_ERR(bbio)) {
> 694 ret = PTR_ERR(bbio);
695 goto fail;
696 }
697 bio = &bbio->bio;
698 }
699
700 /*
701 * Save the iter for the end_io handler and preload the checksums for
702 * data reads.
703 */
704 if (bio_op(bio) == REQ_OP_READ && is_data_bbio(bbio)) {
705 bbio->saved_iter = bio->bi_iter;
706 ret = btrfs_lookup_bio_sums(bbio);
707 if (ret)
708 goto fail;
709 }
710
711 if (btrfs_op(bio) == BTRFS_MAP_WRITE) {
712 if (use_append) {
713 bio->bi_opf &= ~REQ_OP_WRITE;
714 bio->bi_opf |= REQ_OP_ZONE_APPEND;
715 }
716
717 if (is_data_bbio(bbio) && bioc &&
718 btrfs_need_stripe_tree_update(bioc->fs_info, bioc->map_type)) {
719 /*
720 * No locking for the list update, as we only add to
721 * the list in the I/O submission path, and list
722 * iteration only happens in the completion path, which
723 * can't happen until after the last submission.
724 */
725 btrfs_get_bioc(bioc);
726 list_add_tail(&bioc->rst_ordered_entry, &bbio->ordered->bioc_list);
727 }
728
729 /*
730 * Csum items for reloc roots have already been cloned at this
731 * point, so they are handled as part of the no-checksum case.
732 */
733 if (inode && !(inode->flags & BTRFS_INODE_NODATASUM) &&
734 !test_bit(BTRFS_FS_STATE_NO_DATA_CSUMS, &fs_info->fs_state) &&
735 !btrfs_is_data_reloc_root(inode->root)) {
736 if (should_async_write(bbio) &&
737 btrfs_wq_submit_bio(bbio, bioc, &smap, mirror_num))
738 goto done;
739
740 ret = btrfs_bio_csum(bbio);
741 if (ret)
742 goto fail;
743 } else if (use_append ||
744 (btrfs_is_zoned(fs_info) && inode &&
745 inode->flags & BTRFS_INODE_NODATASUM)) {
746 ret = btrfs_alloc_dummy_sum(bbio);
747 if (ret)
748 goto fail;
749 }
750 }
751
752 btrfs_submit_bio(bio, bioc, &smap, mirror_num);
753 done:
754 return map_length == length;
755
756 fail:
757 btrfs_bio_counter_dec(fs_info);
758 /*
759 * We have split the original bbio, now we have to end both the current
760 * @bbio and remaining one, as the remaining one will never be submitted.
761 */
762 if (map_length < length) {
763 struct btrfs_bio *remaining = bbio->private;
764
765 ASSERT(bbio->bio.bi_pool == &btrfs_clone_bioset);
766 ASSERT(remaining);
767
768 btrfs_bio_end_io(remaining, ret);
769 }
770 btrfs_bio_end_io(bbio, ret);
771 /* Do not submit another chunk */
772 return true;
773 }
774
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
On 30.10.24 15:01, kernel test robot wrote:
> sparse warnings: (new ones prefixed by >>)
>>> fs/btrfs/bio.c:694:29: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted blk_status_t [assigned] [usertype] ret @@ got long @@
Yep that definitively needs to be:
diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c
index 96cacd5c03a5..847af28ecff9 100644
--- a/fs/btrfs/bio.c
+++ b/fs/btrfs/bio.c
@@ -691,7 +691,7 @@ 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 = PTR_ERR(bbio);
+ ret = errno_to_blk_status(PTR_ERR(bbio));
goto fail;
}
bio = &bbio->bio;
Can you fold that in John or do you want me to send a new version?
On 30/10/2024 14:06, Johannes Thumshirn wrote:
>>>> ret @@ got long @@
> Yep that definitively needs to be:
>
> diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c
> index 96cacd5c03a5..847af28ecff9 100644
> --- a/fs/btrfs/bio.c
> +++ b/fs/btrfs/bio.c
> @@ -691,7 +691,7 @@ 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 = PTR_ERR(bbio);
> + ret = errno_to_blk_status(PTR_ERR(bbio));
> goto fail;
> }
> bio = &bbio->bio;
>
> Can you fold that in John or do you want me to send a new version?
Sure, no problem.
But I would have suggested to not use variable name "ret" for holding a
blk_status_t in original code, especially when it is mixed with
PTR_ERR() usage ...
Thanks,
John
On 30.10.24 15:21, John Garry wrote:
> On 30/10/2024 14:06, Johannes Thumshirn wrote:
>>>>> ret @@ got long @@
>> Yep that definitively needs to be:
>>
>> diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c
>> index 96cacd5c03a5..847af28ecff9 100644
>> --- a/fs/btrfs/bio.c
>> +++ b/fs/btrfs/bio.c
>> @@ -691,7 +691,7 @@ 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 = PTR_ERR(bbio);
>> + ret = errno_to_blk_status(PTR_ERR(bbio));
>> goto fail;
>> }
>> bio = &bbio->bio;
>>
>> Can you fold that in John or do you want me to send a new version?
>
> Sure, no problem.
>
> But I would have suggested to not use variable name "ret" for holding a
> blk_status_t in original code, especially when it is mixed with
> PTR_ERR() usage ...
Yeah but the original code is using "blk_status_t ret", otherwise it
would be sth. like:
error = PTR_ERR(bbio);
ret = errno_to_blk_status(error);
goto fail;
[...]
fail:
btrfs_bio_end_io(bbio, ret);
Or changing the original code, which we could do but there's way more
urgent problems :)
On 29/10/2024 09:11, Johannes Thumshirn wrote:
> From: Johannes Thumshirn <johannes.thumshirn@wdc.com>
>
> 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@wdc.com>
> ---
>
> John,
> in case you have to send a v3, can you please include this one in your series?
sure, and I think that I will be sending a v3
Cheers
>
> fs/btrfs/bio.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c
> index 1f216d07eff6..96cacd5c03a5 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 = PTR_ERR(bbio);
> + goto fail;
> + }
> bio = &bbio->bio;
> }
>
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