4.19-stable review patch. If anyone has any objections, please let me know.
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From: David Sterba dsterba@suse.com
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@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 --- 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;