The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From d63c00ea435a5352f486c259665a4ced60399421 Mon Sep 17 00:00:00 2001 From: Dmitry Monakhov dmtrmonakhov@yandex-team.ru Date: Sun, 17 Apr 2022 20:03:15 +0300 Subject: [PATCH] ext4: mark group as trimmed only if it was fully scanned
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@yandex-team.ru Link: https://lore.kernel.org/r/1650214995-860245-1-git-send-email-dmtrmonakhov@ya... Signed-off-by: Theodore Ts'o tytso@mit.edu Cc: stable@kernel.org
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 3e715b837e70..bc90635b757c 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -6395,6 +6395,7 @@ __releases(ext4_group_lock_ptr(sb, e4b->bd_group)) * @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 block bitmap searching for free * extents. When the free extent is found, mark it as used in group buddy @@ -6404,7 +6405,7 @@ __releases(ext4_group_lock_ptr(sb, e4b->bd_group)) 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; @@ -6423,7 +6424,7 @@ 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; @@ -6460,6 +6461,7 @@ 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; @@ -6478,8 +6480,10 @@ 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) @@ -6493,6 +6497,7 @@ 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); @@ -6509,12 +6514,13 @@ 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;