[PATCH 6.1.y 1/4] ext4: factor out ext4_percpu_param_init() and ext4_percpu_param_destroy()

Sasha Levin
2026-04-02T16:31:17Z

[ Upstream commit 1f79467c8a6be64940a699de1bd43338a6dd9fdd ]

Factor out ext4_percpu_param_init() and ext4_percpu_param_destroy(). And
also use ext4_percpu_param_destroy() in ext4_put_super() to avoid
duplicated code. No functional change.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20230323140517.1070239-3-yanaijie@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Stable-dep-of: 496bb99b7e66 ("ext4: fix the might_sleep() warnings in kvfree()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ext4/super.c | 85 ++++++++++++++++++++++++++-----------------------
1 file changed, 46 insertions(+), 39 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index fa5642838c79c..31d7df1560158 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1193,6 +1193,49 @@ static inline void ext4_quota_off_umount(struct super_block *sb)
}
#endif

+static int ext4_percpu_param_init(struct ext4_sb_info *sbi)
+{
+ ext4_fsblk_t block;
+ int err;
+
+ block = ext4_count_free_clusters(sbi->s_sb);
+ ext4_free_blocks_count_set(sbi->s_es, EXT4_C2B(sbi, block));
+ err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
+ GFP_KERNEL);
+ if (!err) {
+ unsigned long freei = ext4_count_free_inodes(sbi->s_sb);
+ sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
+ err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
+ GFP_KERNEL);
+ }
+ if (!err)
+ err = percpu_counter_init(&sbi->s_dirs_counter,
+ ext4_count_dirs(sbi->s_sb), GFP_KERNEL);
+ if (!err)
+ err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
+ GFP_KERNEL);
+ if (!err)
+ err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0,
+ GFP_KERNEL);
+ if (!err)
+ err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
+
+ if (err)
+ ext4_msg(sbi->s_sb, KERN_ERR, "insufficient memory");
+
+ return err;
+}
+
+static void ext4_percpu_param_destroy(struct ext4_sb_info *sbi)
+{
+ percpu_counter_destroy(&sbi->s_freeclusters_counter);
+ percpu_counter_destroy(&sbi->s_freeinodes_counter);
+ percpu_counter_destroy(&sbi->s_dirs_counter);
+ percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
+ percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
+ percpu_free_rwsem(&sbi->s_writepages_rwsem);
+}
+
static void ext4_put_super(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
@@ -1259,12 +1302,7 @@ static void ext4_put_super(struct super_block *sb)
kvfree(flex_groups);
}
rcu_read_unlock();
- percpu_counter_destroy(&sbi->s_freeclusters_counter);
- percpu_counter_destroy(&sbi->s_freeinodes_counter);
- percpu_counter_destroy(&sbi->s_dirs_counter);
- percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
- percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
- percpu_free_rwsem(&sbi->s_writepages_rwsem);
+ ext4_percpu_param_destroy(sbi);
#ifdef CONFIG_QUOTA
for (i = 0; i < EXT4_MAXQUOTAS; i++)
kfree(get_qf_name(sb, sbi, i));
@@ -5081,7 +5119,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
struct ext4_super_block *es = NULL;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct flex_groups **flex_groups;
- ext4_fsblk_t block;
ext4_fsblk_t logical_sb_block;
struct inode *root;
int ret = -ENOMEM;
@@ -5488,33 +5525,8 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
sbi->s_journal->j_commit_callback =
ext4_journal_commit_callback;

- block = ext4_count_free_clusters(sb);
- ext4_free_blocks_count_set(sbi->s_es,
- EXT4_C2B(sbi, block));
- err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
- GFP_KERNEL);
- if (!err) {
- unsigned long freei = ext4_count_free_inodes(sb);
- sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
- err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
- GFP_KERNEL);
- }
- if (!err)
- err = percpu_counter_init(&sbi->s_dirs_counter,
- ext4_count_dirs(sb), GFP_KERNEL);
- if (!err)
- err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
- GFP_KERNEL);
- if (!err)
- err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0,
- GFP_KERNEL);
- if (!err)
- err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
-
- if (err) {
- ext4_msg(sb, KERN_ERR, "insufficient memory");
+ if (ext4_percpu_param_init(sbi))
goto failed_mount6;
- }

if (ext4_has_feature_flex_bg(sb))
if (!ext4_fill_flex_info(sb)) {
@@ -5605,12 +5617,7 @@ failed_mount9: __maybe_unused
kvfree(flex_groups);
}
rcu_read_unlock();
- percpu_counter_destroy(&sbi->s_freeclusters_counter);
- percpu_counter_destroy(&sbi->s_freeinodes_counter);
- percpu_counter_destroy(&sbi->s_dirs_counter);
- percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
- percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
- percpu_free_rwsem(&sbi->s_writepages_rwsem);
+ ext4_percpu_param_destroy(sbi);
failed_mount5:
ext4_ext_release(sb);
ext4_release_system_zone(sb);
--
2.53.0