[PATCH] ntfs: fix FITRIM range alignment

[Jacopo Labardi <jacopolabardi@gmail.com>]

ntfs_trim_fs() aligns the start of a free extent up to the device discard
granularity, but derives the discard length by aligning the original extent
length down. When the free extent start is not discard-aligned, adding that
length to the aligned start can extend the discard past the free extent and
into allocated clusters.

For example, with 4 KiB clusters and 32 KiB discard granularity, the free
extent [4 KiB, 36 KiB) becomes the discard range [32 KiB, 64 KiB), so
28 KiB beyond the free extent may be discarded.

Align the absolute end of the free extent down and derive the length from
the two aligned endpoints. Skip extents that contain no full discard unit.

Reproduced with a 4 KiB-cluster NTFS filesystem on scsi_debug configured
for 32 KiB discard granularity and read-zero-after-trim. Before this
change, FITRIM zeroed seven allocated 4 KiB clusters following an unaligned
32 KiB hole. With this change, the same data remains intact across FITRIM
and remount.

Fixes: 11ccc9107dc4 ("ntfs: update runlist handling and cluster allocator")
Cc: stable@vger.kernel.org
Assisted-by: OpenAI Codex:GPT-5.6 Sol Max
Signed-off-by: Jacopo Labardi <jacopolabardi@gmail.com>
---
 fs/ntfs/bitmap.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/ntfs/bitmap.c b/fs/ntfs/bitmap.c
index b1436b3151b98..1840b7d84c628 100644
--- a/fs/ntfs/bitmap.c
+++ b/fs/ntfs/bitmap.c
@@ -64,7 +64,7 @@ int ntfs_trim_fs(struct ntfs_volume *vol, struct fstrim_range *range)
 
 		end = start_buf;
 		while (end < end_buf) {
-			u64 aligned_start, aligned_count;
+			u64 aligned_start, aligned_end, aligned_count;
 			u64 start = find_next_zero_bit(bitmap, end_buf - start_buf,
 					end - start_buf) + start_buf;
 			if (start >= end_buf)
@@ -74,8 +74,10 @@ int ntfs_trim_fs(struct ntfs_volume *vol, struct fstrim_range *range)
 					start - start_buf) + start_buf;
 
 			aligned_start = ALIGN(ntfs_cluster_to_bytes(vol, start), dq);
-			aligned_count =
-				ALIGN_DOWN(ntfs_cluster_to_bytes(vol, end - start), dq);
+			aligned_end = ALIGN_DOWN(ntfs_cluster_to_bytes(vol, end), dq);
+			if (aligned_start >= aligned_end)
+				continue;
+			aligned_count = aligned_end - aligned_start;
 			if (aligned_count >= range->minlen) {
 				ret = blkdev_issue_discard(vol->sb->s_bdev, aligned_start >> 9,
 						aligned_count >> 9, GFP_NOFS);

base-commit: ac727d86fb84bdc9626ba9c756c26767459f3083
-- 
2.55.0