4.19-stable review patch. If anyone has any objections, please let me know.
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From: yangerkun yangerkun@huawei.com
[ Upstream commit 20cee68f5b44fdc2942d20f3172a262ec247b117 ]
Commit 3d56b8d2c74c ("ext4: Speed up FITRIM by recording flags in ext4_group_info") speed up fstrim by skipping trim trimmed group. We also has the chance to clear trimmed once there exists some block free for this group(mount without discard), and the next trim for this group will work well too.
For mount with discard, we will issue dicard when we free blocks, so leave trimmed flag keep alive to skip useless trim trigger from userspace seems reasonable. But for some case like ext4 build on dm-thinpool(ext4 blocksize 4K, pool blocksize 128K), discard from ext4 maybe unaligned for dm thinpool, and thinpool will just finish this discard(see process_discard_bio when begein equals to end) without actually process discard. For this case, trim from userspace can really help us to free some thinpool block.
So convert to clear trimmed flag for all case no matter mounted with discard or not.
Fixes: 3d56b8d2c74c ("ext4: Speed up FITRIM by recording flags in ext4_group_info") Signed-off-by: yangerkun yangerkun@huawei.com Reviewed-by: Jan Kara jack@suse.cz Link: https://patch.msgid.link/20240817085510.2084444-1-yangerkun@huaweicloud.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ext4/mballoc.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 75dbe40ed8f72..329b3cf105742 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2834,11 +2834,8 @@ static void ext4_free_data_in_buddy(struct super_block *sb, /* * Clear the trimmed flag for the group so that the next * ext4_trim_fs can trim it. - * If the volume is mounted with -o discard, online discard - * is supported and the free blocks will be trimmed online. */ - if (!test_opt(sb, DISCARD)) - EXT4_MB_GRP_CLEAR_TRIMMED(db); + EXT4_MB_GRP_CLEAR_TRIMMED(db);
if (!db->bb_free_root.rb_node) { /* No more items in the per group rb tree @@ -4962,8 +4959,9 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode, " group:%d block:%d count:%lu failed" " with %d", block_group, bit, count, err); - } else - EXT4_MB_GRP_CLEAR_TRIMMED(e4b.bd_info); + } + + EXT4_MB_GRP_CLEAR_TRIMMED(e4b.bd_info);
ext4_lock_group(sb, block_group); mb_clear_bits(bitmap_bh->b_data, bit, count_clusters);