* [PATCH] btrfs-progs: fix a wrong return value for write_and_map_eb()
@ 2022-04-18 1:54 Qu Wenruo
2022-04-25 17:13 ` David Sterba
0 siblings, 1 reply; 2+ messages in thread
From: Qu Wenruo @ 2022-04-18 1:54 UTC (permalink / raw)
To: linux-btrfs
[BUG]
With commit "btrfs-progs: use write_data_to_disk() to replace
write_extent_to_disk()", "mkfs.btrfs -m raid5" will always fail:
kernel-shared/transaction.c:155: __commit_transaction: BUG_ON `ret` triggered, value 65536
./mkfs.btrfs(+0x57dd2)[0x557e610addd2]
./mkfs.btrfs(+0x57e70)[0x557e610ade70]
./mkfs.btrfs(__commit_transaction+0x139)[0x557e610ae4d4]
./mkfs.btrfs(btrfs_commit_transaction+0x214)[0x557e610ae746]
./mkfs.btrfs(main+0x19d9)[0x557e61066d34]
/usr/lib/libc.so.6(+0x2d310)[0x7f2bf222d310]
/usr/lib/libc.so.6(__libc_start_main+0x81)[0x7f2bf222d3c1]
./mkfs.btrfs(_start+0x25)[0x557e61062925]
Aborted (core dumped)
[CAUSE]
Commit "btrfs-progs: use write_data_to_disk() to replace
write_extent_to_disk()" refactor write_and_map_eb() very slightly, but
it changed the return value on successful writeback for RAID56.
Previously we return 0, but now we return the stripe length, causing
btrfs_commit_transaction() to freak out.
[FIX]
Fix it by just reseting ret to 0 if nothing wrong happened for RAID56.
Please fold this fix into commit "btrfs-progs: use write_data_to_disk()
to replace write_extent_to_disk()".
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
kernel-shared/disk-io.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel-shared/disk-io.c b/kernel-shared/disk-io.c
index 4aae7a35768c..26b1c9aa192a 100644
--- a/kernel-shared/disk-io.c
+++ b/kernel-shared/disk-io.c
@@ -477,6 +477,8 @@ int write_and_map_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb)
error(
"failed to write raid56 stripe for bytenr %llu length %llu: %m",
eb->start, length);
+ } else {
+ ret = 0;
}
goto out;
}
--
2.35.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] btrfs-progs: fix a wrong return value for write_and_map_eb()
2022-04-18 1:54 [PATCH] btrfs-progs: fix a wrong return value for write_and_map_eb() Qu Wenruo
@ 2022-04-25 17:13 ` David Sterba
0 siblings, 0 replies; 2+ messages in thread
From: David Sterba @ 2022-04-25 17:13 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs
On Mon, Apr 18, 2022 at 09:54:24AM +0800, Qu Wenruo wrote:
> [BUG]
> With commit "btrfs-progs: use write_data_to_disk() to replace
> write_extent_to_disk()", "mkfs.btrfs -m raid5" will always fail:
>
> kernel-shared/transaction.c:155: __commit_transaction: BUG_ON `ret` triggered, value 65536
> ./mkfs.btrfs(+0x57dd2)[0x557e610addd2]
> ./mkfs.btrfs(+0x57e70)[0x557e610ade70]
> ./mkfs.btrfs(__commit_transaction+0x139)[0x557e610ae4d4]
> ./mkfs.btrfs(btrfs_commit_transaction+0x214)[0x557e610ae746]
> ./mkfs.btrfs(main+0x19d9)[0x557e61066d34]
> /usr/lib/libc.so.6(+0x2d310)[0x7f2bf222d310]
> /usr/lib/libc.so.6(__libc_start_main+0x81)[0x7f2bf222d3c1]
> ./mkfs.btrfs(_start+0x25)[0x557e61062925]
> Aborted (core dumped)
>
> [CAUSE]
> Commit "btrfs-progs: use write_data_to_disk() to replace
> write_extent_to_disk()" refactor write_and_map_eb() very slightly, but
> it changed the return value on successful writeback for RAID56.
>
> Previously we return 0, but now we return the stripe length, causing
> btrfs_commit_transaction() to freak out.
>
> [FIX]
> Fix it by just reseting ret to 0 if nothing wrong happened for RAID56.
>
> Please fold this fix into commit "btrfs-progs: use write_data_to_disk()
> to replace write_extent_to_disk()".
Now folded and the original series with raid56 repair added to devel
again, thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-04-18 1:54 [PATCH] btrfs-progs: fix a wrong return value for write_and_map_eb() Qu Wenruo
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