From: Dmitry Monakhov dmtrmonakhov@yandex-team.ru
commit d63c00ea435a5352f486c259665a4ced60399421 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ext4/mballoc.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-)
--- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -6378,6 +6378,7 @@ __releases(ext4_group_lock_ptr(sb, e4b-> * @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 @@ -6387,7 +6388,7 @@ __releases(ext4_group_lock_ptr(sb, e4b-> 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; @@ -6406,7 +6407,7 @@ ext4_trim_all_free(struct super_block *s if (!EXT4_MB_GRP_WAS_TRIMMED(e4b.bd_info) || minblocks < atomic_read(&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; @@ -6443,6 +6444,7 @@ int ext4_trim_fs(struct super_block *sb, 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; @@ -6461,8 +6463,10 @@ int ext4_trim_fs(struct super_block *sb, 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) @@ -6476,6 +6480,7 @@ int ext4_trim_fs(struct super_block *sb,
/* 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); @@ -6492,12 +6497,13 @@ int ext4_trim_fs(struct super_block *sb, * 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;