This is a note to let you know that I've just added the patch titled
btrfs: zoned: fix critical section of relocation inode writeback
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-zoned-fix-critical-section-of-relocation-inode-writeback.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 19ab78ca86981e0e1e73036fb73a508731a7c078 Mon Sep 17 00:00:00 2001
From: Naohiro Aota <naohiro.aota@xxxxxxx>
Date: Tue, 7 Jun 2022 16:08:30 +0900
Subject: btrfs: zoned: fix critical section of relocation inode writeback
From: Naohiro Aota <naohiro.aota@xxxxxxx>
commit 19ab78ca86981e0e1e73036fb73a508731a7c078 upstream.
We use btrfs_zoned_data_reloc_{lock,unlock} to allow only one process to
write out to the relocation inode. That critical section must include all
the IO submission for the inode. However, flush_write_bio() in
extent_writepages() is out of the critical section, causing an IO
submission outside of the lock. This leads to an out of the order IO
submission and fail the relocation process.
Fix it by extending the critical section.
Fixes: 35156d852762 ("btrfs: zoned: only allow one process to add pages to a relocation inode")
CC: stable@xxxxxxxxxxxxxxx # 5.16+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/extent_io.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -5152,13 +5152,14 @@ int extent_writepages(struct address_spa
*/
btrfs_zoned_data_reloc_lock(BTRFS_I(inode));
ret = extent_write_cache_pages(mapping, wbc, &epd);
- btrfs_zoned_data_reloc_unlock(BTRFS_I(inode));
ASSERT(ret <= 0);
if (ret < 0) {
+ btrfs_zoned_data_reloc_unlock(BTRFS_I(inode));
end_write_bio(&epd, ret);
return ret;
}
ret = flush_write_bio(&epd);
+ btrfs_zoned_data_reloc_unlock(BTRFS_I(inode));
return ret;
}
Patches currently in stable-queue which might be from naohiro.aota@xxxxxxx are
queue-5.15/btrfs-zoned-fix-critical-section-of-relocation-inode-writeback.patch
queue-5.15/btrfs-zoned-prevent-allocation-from-previous-data-relocation-bg.patch
