This is a note to let you know that I've just added the patch titled
btrfs: set correct ram_bytes when splitting ordered extent
to the 6.6-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-set-correct-ram_bytes-when-splitting-ordered-extent.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 63a6ce5a1a6261e4c70bad2b55c4e0de8da4762e Mon Sep 17 00:00:00 2001
From: Qu Wenruo <wqu@xxxxxxxx>
Date: Tue, 16 Apr 2024 08:07:00 +0930
Subject: btrfs: set correct ram_bytes when splitting ordered extent
From: Qu Wenruo <wqu@xxxxxxxx>
commit 63a6ce5a1a6261e4c70bad2b55c4e0de8da4762e upstream.
[BUG]
When running generic/287, the following file extent items can be
generated:
item 16 key (258 EXTENT_DATA 2682880) itemoff 15305 itemsize 53
generation 9 type 1 (regular)
extent data disk byte 1378414592 nr 462848
extent data offset 0 nr 462848 ram 2097152
extent compression 0 (none)
Note that file extent item is not a compressed one, but its ram_bytes is
way larger than its disk_num_bytes.
According to btrfs on-disk scheme, ram_bytes should match disk_num_bytes
if it's not a compressed one.
[CAUSE]
Since commit b73a6fd1b1ef ("btrfs: split partial dio bios before
submit"), for partial dio writes, we would split the ordered extent.
However the function btrfs_split_ordered_extent() doesn't update the
ram_bytes even it has already shrunk the disk_num_bytes.
Originally the function btrfs_split_ordered_extent() is only introduced
for zoned devices in commit d22002fd37bd ("btrfs: zoned: split ordered
extent when bio is sent"), but later commit b73a6fd1b1ef ("btrfs: split
partial dio bios before submit") makes non-zoned btrfs affected.
Thankfully for un-compressed file extent, we do not really utilize the
ram_bytes member, thus it won't cause any real problem.
[FIX]
Also update btrfs_ordered_extent::ram_bytes inside
btrfs_split_ordered_extent().
Fixes: d22002fd37bd ("btrfs: zoned: split ordered extent when bio is sent")
CC: stable@xxxxxxxxxxxxxxx # 5.15+
Reviewed-by: Filipe Manana <fdmanana@xxxxxxxx>
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/ordered-data.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -1202,6 +1202,7 @@ struct btrfs_ordered_extent *btrfs_split
ordered->disk_bytenr += len;
ordered->num_bytes -= len;
ordered->disk_num_bytes -= len;
+ ordered->ram_bytes -= len;
if (test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags)) {
ASSERT(ordered->bytes_left == 0);
Patches currently in stable-queue which might be from wqu@xxxxxxxx are
queue-6.6/btrfs-set-correct-ram_bytes-when-splitting-ordered-extent.patch
queue-6.6/btrfs-always-clear-pertrans-metadata-during-commit.patch
queue-6.6/btrfs-make-btrfs_clear_delalloc_extent-free-delalloc.patch
