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btrfs: don't warn if discard range is not aligned to sector

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commit a208b3f132 upstream.

There's a warning in btrfs_issue_discard() when the range is not aligned
to 512 bytes, originally added in 4d89d377bb ("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@vger.kernel.org # 4.19+
Reported-by: syzbot+4a4f1eba14eb5c3417d1@syzkaller.appspotmail.com
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Sterba 2024-01-15 20:30:26 +01:00 • committed by Greg Kroah-Hartman
commit 86aff7c5f7
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/extent-tree.c
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@ -1209,7 +1209,8 @@ static int btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len,
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;