From: Zqiang <[email protected]>
The superblock is freed through call_rcu() and schedule_work(),
these two steps can be replaced by queue_rcu_work().
Signed-off-by: Zqiang <[email protected]>
---
fs/super.c | 15 +++++----------
include/linux/fs.h | 3 +--
2 files changed, 6 insertions(+), 12 deletions(-)
diff --git a/fs/super.c b/fs/super.c
index 11b7e7213fd1..6b796bbc5ba3 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -156,8 +156,8 @@ static unsigned long super_cache_count(struct shrinker *shrink,
static void destroy_super_work(struct work_struct *work)
{
- struct super_block *s = container_of(work, struct super_block,
- destroy_work);
+ struct super_block *s = container_of(to_rcu_work(work), struct super_block,
+ rcu_work);
int i;
for (i = 0; i < SB_FREEZE_LEVELS; i++)
@@ -165,12 +165,6 @@ static void destroy_super_work(struct work_struct *work)
kfree(s);
}
-static void destroy_super_rcu(struct rcu_head *head)
-{
- struct super_block *s = container_of(head, struct super_block, rcu);
- INIT_WORK(&s->destroy_work, destroy_super_work);
- schedule_work(&s->destroy_work);
-}
/* Free a superblock that has never been seen by anyone */
static void destroy_unused_super(struct super_block *s)
@@ -185,7 +179,7 @@ static void destroy_unused_super(struct super_block *s)
kfree(s->s_subtype);
free_prealloced_shrinker(&s->s_shrink);
/* no delays needed */
- destroy_super_work(&s->destroy_work);
+ destroy_super_work(&s->rcu_work.work);
}
/**
@@ -249,6 +243,7 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags,
spin_lock_init(&s->s_inode_list_lock);
INIT_LIST_HEAD(&s->s_inodes_wb);
spin_lock_init(&s->s_inode_wblist_lock);
+ INIT_RCU_WORK(&s->rcu_work, destroy_super_work);
s->s_count = 1;
atomic_set(&s->s_active, 1);
@@ -296,7 +291,7 @@ static void __put_super(struct super_block *s)
fscrypt_sb_free(s);
put_user_ns(s->s_user_ns);
kfree(s->s_subtype);
- call_rcu(&s->rcu, destroy_super_rcu);
+ queue_rcu_work(system_wq, &s->rcu_work);
}
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c3c88fdb9b2a..2fe2b4d67af2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1534,8 +1534,7 @@ struct super_block {
*/
struct list_lru s_dentry_lru;
struct list_lru s_inode_lru;
- struct rcu_head rcu;
- struct work_struct destroy_work;
+ struct rcu_work rcu_work;
struct mutex s_sync_lock; /* sync serialisation lock */
--
2.17.1
Hello AI Viro
Can you review this patch?
Thanks
Qiang
________________________________________
From: Zhang, Qiang <[email protected]>
Sent: Tuesday, 25 May 2021 14:55
To: [email protected]; [email protected]
Cc: [email protected]; [email protected]
Subject: [PATCH] fs/super: simplify superblock destroy action
From: Zqiang <[email protected]>
The superblock is freed through call_rcu() and schedule_work(),
these two steps can be replaced by queue_rcu_work().
Signed-off-by: Zqiang <[email protected]>
---
fs/super.c | 15 +++++----------
include/linux/fs.h | 3 +--
2 files changed, 6 insertions(+), 12 deletions(-)
diff --git a/fs/super.c b/fs/super.c
index 11b7e7213fd1..6b796bbc5ba3 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -156,8 +156,8 @@ static unsigned long super_cache_count(struct shrinker *shrink,
static void destroy_super_work(struct work_struct *work)
{
- struct super_block *s = container_of(work, struct super_block,
- destroy_work);
+ struct super_block *s = container_of(to_rcu_work(work), struct super_block,
+ rcu_work);
int i;
for (i = 0; i < SB_FREEZE_LEVELS; i++)
@@ -165,12 +165,6 @@ static void destroy_super_work(struct work_struct *work)
kfree(s);
}
-static void destroy_super_rcu(struct rcu_head *head)
-{
- struct super_block *s = container_of(head, struct super_block, rcu);
- INIT_WORK(&s->destroy_work, destroy_super_work);
- schedule_work(&s->destroy_work);
-}
/* Free a superblock that has never been seen by anyone */
static void destroy_unused_super(struct super_block *s)
@@ -185,7 +179,7 @@ static void destroy_unused_super(struct super_block *s)
kfree(s->s_subtype);
free_prealloced_shrinker(&s->s_shrink);
/* no delays needed */
- destroy_super_work(&s->destroy_work);
+ destroy_super_work(&s->rcu_work.work);
}
/**
@@ -249,6 +243,7 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags,
spin_lock_init(&s->s_inode_list_lock);
INIT_LIST_HEAD(&s->s_inodes_wb);
spin_lock_init(&s->s_inode_wblist_lock);
+ INIT_RCU_WORK(&s->rcu_work, destroy_super_work);
s->s_count = 1;
atomic_set(&s->s_active, 1);
@@ -296,7 +291,7 @@ static void __put_super(struct super_block *s)
fscrypt_sb_free(s);
put_user_ns(s->s_user_ns);
kfree(s->s_subtype);
- call_rcu(&s->rcu, destroy_super_rcu);
+ queue_rcu_work(system_wq, &s->rcu_work);
}
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c3c88fdb9b2a..2fe2b4d67af2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1534,8 +1534,7 @@ struct super_block {
*/
struct list_lru s_dentry_lru;
struct list_lru s_inode_lru;
- struct rcu_head rcu;
- struct work_struct destroy_work;
+ struct rcu_work rcu_work;
struct mutex s_sync_lock; /* sync serialisation lock */
--
2.17.1