This is a note to let you know that I've just added the patch titled
btrfs: don't warn if discard range is not aligned to sector
to the 4.19-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-don-t-warn-if-discard-range-is-not-aligned-to-sector.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a208b3f132b48e1f94f620024e66fea635925877 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@xxxxxxxx>
Date: Mon, 15 Jan 2024 20:30:26 +0100
Subject: btrfs: don't warn if discard range is not aligned to sector
From: David Sterba <dsterba@xxxxxxxx>
commit a208b3f132b48e1f94f620024e66fea635925877 upstream.
There's a warning in btrfs_issue_discard() when the range is not aligned
to 512 bytes, originally added in 4d89d377bbb0 ("btrfs:
btrfs_issue_discard ensure offset/length are aligned to sector
boundaries"). We can't do sub-sector writes anyway so the adjustment is
the only thing that we can do and the warning is unnecessary.
CC: stable@xxxxxxxxxxxxxxx # 4.19+
Reported-by: syzbot+4a4f1eba14eb5c3417d1@xxxxxxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: Anand Jain <anand.jain@xxxxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/extent-tree.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1899,7 +1899,8 @@ static int btrfs_issue_discard(struct bl
u64 bytes_left, end;
u64 aligned_start = ALIGN(start, 1 << 9);
- if (WARN_ON(start != aligned_start)) {
+ /* Adjust the range to be aligned to 512B sectors if necessary. */
+ if (start != aligned_start) {
len -= aligned_start - start;
len = round_down(len, 1 << 9);
start = aligned_start;
Patches currently in stable-queue which might be from dsterba@xxxxxxxx are
queue-4.19/btrfs-defrag-reject-unknown-flags-of-btrfs_ioctl_defrag_range_args.patch
queue-4.19/btrfs-don-t-warn-if-discard-range-is-not-aligned-to-sector.patch
