[merged mm-nonmm-stable] ocfs2-reject-fitrim-ranges-shorter-than-a-cluster.patch removed from -mm tree

[merged mm-nonmm-stable] ocfs2-reject-fitrim-ranges-shorter-than-a-cluster.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: ocfs2: reject FITRIM ranges shorter than a cluster
has been removed from the -mm tree.  Its filename was
     ocfs2-reject-fitrim-ranges-shorter-than-a-cluster.patch

This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Zhang Cen <rollkingzzc@gmail.com>
Subject: ocfs2: reject FITRIM ranges shorter than a cluster
Date: Thu, 28 May 2026 23:12:47 +0800

ocfs2_trim_mainbm() trims the global bitmap in cluster units, but its
too-short range validation only checks sb->s_blocksize.

On filesystems with a cluster size larger than the block size, a FITRIM
range that is at least one block but shorter than one cluster is accepted
and shifted down to len == 0.  The later start + len - 1 and len -= ... 
arithmetic then underflows and can drive trimming past the requested
range.

Reject ranges shorter than s_clustersize instead.  That preserves the
existing -EINVAL behavior for requests that cannot discard even one
allocation unit and keeps zero-cluster trims out of the group walk.

Link: https://lore.kernel.org/20260528151247.361854-1-rollkingzzc@gmail.com
Fixes: aa89762c5480 ("ocfs2: return EINVAL if the given range to discard is less than block size")
Assisted-by: Codex:gpt-5.5
Signed-off-by: Zhang Cen <rollkingzzc@gmail.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Heming Zhao <heming.zhao@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ocfs2/alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ocfs2/alloc.c~ocfs2-reject-fitrim-ranges-shorter-than-a-cluster
+++ a/fs/ocfs2/alloc.c
@@ -7576,7 +7576,7 @@ int ocfs2_trim_mainbm(struct super_block
 	len = range->len >> osb->s_clustersize_bits;
 	minlen = range->minlen >> osb->s_clustersize_bits;
 
-	if (minlen >= osb->bitmap_cpg || range->len < sb->s_blocksize)
+	if (minlen >= osb->bitmap_cpg || range->len < osb->s_clustersize)
 		return -EINVAL;
 
 	trace_ocfs2_trim_mainbm(start, len, minlen);
_

Patches currently in -mm which might be from rollkingzzc@gmail.com are