Patch "ext4: mark group as trimmed only if it was fully scanned" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

    ext4: mark group as trimmed only if it was fully scanned

to the 5.4-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:
     ext4-mark-group-as-trimmed-only-if-it-was-fully-scan.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e8cd80fe901e4991c8fdd9fdc9d391c8c5ca1dc9
Author: Dmitry Monakhov <dmtrmonakhov@xxxxxxxxxxxxxx>
Date:   Sun Apr 17 20:03:15 2022 +0300

    ext4: mark group as trimmed only if it was fully scanned
    
    [ Upstream commit d63c00ea435a5352f486c259665a4ced60399421 ]
    
    Otherwise nonaligned fstrim calls will works inconveniently for iterative
    scanners, for example:
    
    // trim [0,16MB] for group-1, but mark full group as trimmed
    fstrim  -o $((1024*1024*128)) -l $((1024*1024*16)) ./m
    // handle [16MB,16MB] for group-1, do nothing because group already has the flag.
    fstrim  -o $((1024*1024*144)) -l $((1024*1024*16)) ./m
    
    [ Update function documentation for ext4_trim_all_free -- TYT ]
    
    Signed-off-by: Dmitry Monakhov <dmtrmonakhov@xxxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/1650214995-860245-1-git-send-email-dmtrmonakhov@xxxxxxxxxxxxxx
    Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
    Cc: stable@xxxxxxxxxx
    Stable-dep-of: 45e4ab320c9b ("ext4: move setting of trimmed bit into ext4_try_to_trim_range()")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index db6bc24936479..7cd2f2c07858f 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -5248,6 +5248,7 @@ static int ext4_try_to_trim_range(struct super_block *sb,
  * @start:		first group block to examine
  * @max:		last group block to examine
  * @minblocks:		minimum extent block count
+ * @set_trimmed:	set the trimmed flag if at least one block is trimmed
  *
  * ext4_trim_all_free walks through group's buddy bitmap searching for free
  * extents. When the free block is found, ext4_trim_extent is called to TRIM
@@ -5262,7 +5263,7 @@ static int ext4_try_to_trim_range(struct super_block *sb,
 static ext4_grpblk_t
 ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
 		   ext4_grpblk_t start, ext4_grpblk_t max,
-		   ext4_grpblk_t minblocks)
+		   ext4_grpblk_t minblocks, bool set_trimmed)
 {
 	struct ext4_buddy e4b;
 	int ret;
@@ -5281,7 +5282,7 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
 	if (!EXT4_MB_GRP_WAS_TRIMMED(e4b.bd_info) ||
 	    minblocks < EXT4_SB(sb)->s_last_trim_minblks) {
 		ret = ext4_try_to_trim_range(sb, &e4b, start, max, minblocks);
-		if (ret >= 0)
+		if (ret >= 0 && set_trimmed)
 			EXT4_MB_GRP_SET_TRIMMED(e4b.bd_info);
 	} else {
 		ret = 0;
@@ -5318,6 +5319,7 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
 	ext4_fsblk_t first_data_blk =
 			le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 	ext4_fsblk_t max_blks = ext4_blocks_count(EXT4_SB(sb)->s_es);
+	bool whole_group, eof = false;
 	int ret = 0;
 
 	start = range->start >> sb->s_blocksize_bits;
@@ -5336,8 +5338,10 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
 		if (minlen > EXT4_CLUSTERS_PER_GROUP(sb))
 			goto out;
 	}
-	if (end >= max_blks)
+	if (end >= max_blks - 1) {
 		end = max_blks - 1;
+		eof = true;
+	}
 	if (end <= first_data_blk)
 		goto out;
 	if (start < first_data_blk)
@@ -5351,6 +5355,7 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
 
 	/* end now represents the last cluster to discard in this group */
 	end = EXT4_CLUSTERS_PER_GROUP(sb) - 1;
+	whole_group = true;
 
 	for (group = first_group; group <= last_group; group++) {
 		grp = ext4_get_group_info(sb, group);
@@ -5367,12 +5372,13 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
 		 * change it for the last group, note that last_cluster is
 		 * already computed earlier by ext4_get_group_no_and_offset()
 		 */
-		if (group == last_group)
+		if (group == last_group) {
 			end = last_cluster;
-
+			whole_group = eof ? true : end == EXT4_CLUSTERS_PER_GROUP(sb) - 1;
+		}
 		if (grp->bb_free >= minlen) {
 			cnt = ext4_trim_all_free(sb, group, first_cluster,
-						end, minlen);
+						 end, minlen, whole_group);
 			if (cnt < 0) {
 				ret = cnt;
 				break;



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