4.19-stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara jack@suse.cz
[ Upstream commit 45e4ab320c9b5fa67b1fc3b6a9b381cfcc0c8488 ]
Currently we set the group's trimmed bit in ext4_trim_all_free() based on return value of ext4_try_to_trim_range(). However when we will want to abort trimming because of suspend attempt, we want to return success from ext4_try_to_trim_range() but not set the trimmed bit. Instead implementing awkward propagation of this information, just move setting of trimmed bit into ext4_try_to_trim_range() when the whole group is trimmed.
Cc: stable@kernel.org Signed-off-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20230913150504.9054-1-jack@suse.cz Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ext4/mballoc.c | 46 +++++++++++++++++++++++++--------------------- 1 file changed, 25 insertions(+), 21 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 22da6b1143e5d..94b3bf8173e20 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -5184,14 +5184,27 @@ __acquires(bitlock) return ret; }
+static ext4_grpblk_t ext4_last_grp_cluster(struct super_block *sb, + ext4_group_t grp) +{ + if (grp < ext4_get_groups_count(sb)) + return EXT4_CLUSTERS_PER_GROUP(sb) - 1; + return (ext4_blocks_count(EXT4_SB(sb)->s_es) - + ext4_group_first_block_no(sb, grp) - 1) >> + EXT4_CLUSTER_BITS(sb); +} + static int ext4_try_to_trim_range(struct super_block *sb, struct ext4_buddy *e4b, ext4_grpblk_t start, ext4_grpblk_t max, ext4_grpblk_t minblocks) { ext4_grpblk_t next, count, free_count; + bool set_trimmed = false; void *bitmap;
bitmap = e4b->bd_bitmap; + if (start == 0 && max >= ext4_last_grp_cluster(sb, e4b->bd_group)) + set_trimmed = true; start = max(e4b->bd_info->bb_first_free, start); count = 0; free_count = 0; @@ -5206,16 +5219,14 @@ static int ext4_try_to_trim_range(struct super_block *sb, int ret = ext4_trim_extent(sb, start, next - start, e4b);
if (ret && ret != -EOPNOTSUPP) - break; + return count; count += next - start; } free_count += next - start; start = next + 1;
- if (fatal_signal_pending(current)) { - count = -ERESTARTSYS; - break; - } + if (fatal_signal_pending(current)) + return -ERESTARTSYS;
if (need_resched()) { ext4_unlock_group(sb, e4b->bd_group); @@ -5227,6 +5238,9 @@ static int ext4_try_to_trim_range(struct super_block *sb, break; }
+ if (set_trimmed) + EXT4_MB_GRP_SET_TRIMMED(e4b->bd_info); + return count; }
@@ -5237,7 +5251,6 @@ 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 @@ -5252,7 +5265,7 @@ 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, bool set_trimmed) + ext4_grpblk_t minblocks) { struct ext4_buddy e4b; int ret; @@ -5269,13 +5282,10 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group, ext4_lock_group(sb, group);
if (!EXT4_MB_GRP_WAS_TRIMMED(e4b.bd_info) || - minblocks < EXT4_SB(sb)->s_last_trim_minblks) { + minblocks < EXT4_SB(sb)->s_last_trim_minblks) ret = ext4_try_to_trim_range(sb, &e4b, start, max, minblocks); - if (ret >= 0 && set_trimmed) - EXT4_MB_GRP_SET_TRIMMED(e4b.bd_info); - } else { + else ret = 0; - }
ext4_unlock_group(sb, group); ext4_mb_unload_buddy(&e4b); @@ -5308,7 +5318,6 @@ 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; @@ -5327,10 +5336,8 @@ 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 - 1) { + if (end >= max_blks - 1) end = max_blks - 1; - eof = true; - } if (end <= first_data_blk) goto out; if (start < first_data_blk) @@ -5344,7 +5351,6 @@ 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); @@ -5361,13 +5367,11 @@ 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, whole_group); + end, minlen); if (cnt < 0) { ret = cnt; break;