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-rw-r--r--fs/mount.h1
-rw-r--r--fs/namespace.c2
-rw-r--r--fs/super.c2
-rw-r--r--include/linux/acct.h6
-rw-r--r--include/linux/fs.h1
-rw-r--r--kernel/acct.c135
6 files changed, 62 insertions, 85 deletions
diff --git a/fs/mount.h b/fs/mount.h
index d55297f2fa05..0a2d1458681f 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -56,6 +56,7 @@ struct mount {
int mnt_group_id; /* peer group identifier */
int mnt_expiry_mark; /* true if marked for expiry */
int mnt_pinned;
+ struct hlist_head mnt_pins;
struct path mnt_ex_mountpoint;
};
diff --git a/fs/namespace.c b/fs/namespace.c
index 182bc41cd887..22e530addfaf 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -956,7 +956,7 @@ put_again:
mnt->mnt_pinned = 0;
rcu_read_unlock();
unlock_mount_hash();
- acct_auto_close_mnt(&mnt->mnt);
+ acct_auto_close_mnt(&mnt->mnt_pins);
goto put_again;
}
if (unlikely(mnt->mnt.mnt_flags & MNT_DOOMED)) {
diff --git a/fs/super.c b/fs/super.c
index d20d5b11dedf..52ed93eb63df 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -703,7 +703,7 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
#endif
if (flags & MS_RDONLY)
- acct_auto_close(sb);
+ acct_auto_close(&sb->s_pins);
shrink_dcache_sb(sb);
remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY);
diff --git a/include/linux/acct.h b/include/linux/acct.h
index 4a5b7cb56079..65a4f889182e 100644
--- a/include/linux/acct.h
+++ b/include/linux/acct.h
@@ -24,14 +24,14 @@ struct super_block;
struct pacct_struct;
struct pid_namespace;
extern int acct_parm[]; /* for sysctl */
-extern void acct_auto_close_mnt(struct vfsmount *m);
-extern void acct_auto_close(struct super_block *sb);
+extern void acct_auto_close(struct hlist_head *);
+extern void acct_auto_close_mnt(struct hlist_head *);
extern void acct_collect(long exitcode, int group_dead);
extern void acct_process(void);
extern void acct_exit_ns(struct pid_namespace *);
#else
-#define acct_auto_close_mnt(x) do { } while (0)
#define acct_auto_close(x) do { } while (0)
+#define acct_auto_close_mnt(x) do { } while (0)
#define acct_collect(x,y) do { } while (0)
#define acct_process() do { } while (0)
#define acct_exit_ns(ns) do { } while (0)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4b7d57cf7863..17f70872a4a5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1250,6 +1250,7 @@ struct super_block {
/* AIO completions deferred from interrupt context */
struct workqueue_struct *s_dio_done_wq;
+ struct hlist_head s_pins;
/*
* Keep the lru lists last in the structure so they always sit on their
diff --git a/kernel/acct.c b/kernel/acct.c
index 019f012a3c6f..21fbb3c27c2a 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -59,6 +59,7 @@
#include <asm/div64.h>
#include <linux/blkdev.h> /* sector_div */
#include <linux/pid_namespace.h>
+#include <../fs/mount.h> /* will go away when we refactor */
/*
* These constants control the amount of freespace that suspend and
@@ -79,16 +80,16 @@ static void do_acct_process(struct bsd_acct_struct *acct);
struct bsd_acct_struct {
long count;
+ struct hlist_node s_list;
+ struct hlist_node m_list;
struct mutex lock;
int active;
unsigned long needcheck;
struct file *file;
struct pid_namespace *ns;
- struct list_head list;
};
static DEFINE_SPINLOCK(acct_lock);
-static LIST_HEAD(acct_list);
/*
* Check the amount of free space and suspend/resume accordingly.
@@ -133,25 +134,33 @@ static void acct_put(struct bsd_acct_struct *p)
spin_unlock(&acct_lock);
}
-static struct bsd_acct_struct *acct_get(struct bsd_acct_struct **p)
+static struct bsd_acct_struct *__acct_get(struct bsd_acct_struct *res)
+{
+ res->count++;
+ spin_unlock(&acct_lock);
+ mutex_lock(&res->lock);
+ if (!res->ns) {
+ mutex_unlock(&res->lock);
+ spin_lock(&acct_lock);
+ if (!--res->count)
+ kfree(res);
+ return NULL;
+ }
+ return res;
+}
+
+static struct bsd_acct_struct *acct_get(struct pid_namespace *ns)
{
struct bsd_acct_struct *res;
spin_lock(&acct_lock);
again:
- res = *p;
- if (res)
- res->count++;
- spin_unlock(&acct_lock);
- if (res) {
- mutex_lock(&res->lock);
- if (!res->ns) {
- mutex_unlock(&res->lock);
- spin_lock(&acct_lock);
- if (!--res->count)
- kfree(res);
- goto again;
- }
+ if (!ns->bacct) {
+ spin_unlock(&acct_lock);
+ return NULL;
}
+ res = __acct_get(ns->bacct);
+ if (!res)
+ goto again;
return res;
}
@@ -162,7 +171,8 @@ static void acct_kill(struct bsd_acct_struct *acct,
struct file *file = acct->file;
struct pid_namespace *ns = acct->ns;
spin_lock(&acct_lock);
- list_del(&acct->list);
+ hlist_del(&acct->m_list);
+ hlist_del(&acct->s_list);
mnt_unpin(file->f_path.mnt);
spin_unlock(&acct_lock);
do_acct_process(acct);
@@ -170,8 +180,10 @@ static void acct_kill(struct bsd_acct_struct *acct,
spin_lock(&acct_lock);
ns->bacct = new;
if (new) {
- mnt_pin(new->file->f_path.mnt);
- list_add(&new->list, &acct_list);
+ struct vfsmount *m = new->file->f_path.mnt;
+ mnt_pin(m);
+ hlist_add_head(&new->s_list, &m->mnt_sb->s_pins);
+ hlist_add_head(&new->m_list, &real_mount(m)->mnt_pins);
}
acct->ns = NULL;
mutex_unlock(&acct->lock);
@@ -218,14 +230,15 @@ static int acct_on(struct filename *pathname)
mutex_init(&acct->lock);
mnt = file->f_path.mnt;
- old = acct_get(&ns->bacct);
+ old = acct_get(ns);
if (old) {
acct_kill(old, acct);
} else {
spin_lock(&acct_lock);
ns->bacct = acct;
mnt_pin(mnt);
- list_add(&acct->list, &acct_list);
+ hlist_add_head(&acct->s_list, &mnt->mnt_sb->s_pins);
+ hlist_add_head(&acct->m_list, &real_mount(mnt)->mnt_pins);
spin_unlock(&acct_lock);
}
mntput(mnt); /* it's pinned, now give up active reference */
@@ -261,79 +274,41 @@ SYSCALL_DEFINE1(acct, const char __user *, name)
mutex_unlock(&acct_on_mutex);
putname(tmp);
} else {
- acct_kill(acct_get(&task_active_pid_ns(current)->bacct), NULL);
+ acct_kill(acct_get(task_active_pid_ns(current)), NULL);
}
return error;
}
-/**
- * acct_auto_close - turn off a filesystem's accounting if it is on
- * @m: vfsmount being shut down
- *
- * If the accounting is turned on for a file in the subtree pointed to
- * to by m, turn accounting off. Done when m is about to die.
- */
-void acct_auto_close_mnt(struct vfsmount *m)
+void acct_auto_close_mnt(struct hlist_head *list)
{
- struct bsd_acct_struct *acct;
-
- spin_lock(&acct_lock);
-restart:
- list_for_each_entry(acct, &acct_list, list)
- if (acct->file->f_path.mnt == m) {
- acct->count++;
- spin_unlock(&acct_lock);
- mutex_lock(&acct->lock);
- if (!acct->ns) {
- mutex_unlock(&acct->lock);
- spin_lock(&acct_lock);
- if (!--acct->count)
- kfree(acct);
- goto restart;
- }
- acct_kill(acct, NULL);
- spin_lock(&acct_lock);
- goto restart;
- }
+ while (1) {
+ spin_lock(&acct_lock);
+ if (!list->first)
+ break;
+ acct_kill(__acct_get(hlist_entry(list->first,
+ struct bsd_acct_struct,
+ m_list)), NULL);
+ }
spin_unlock(&acct_lock);
}
-/**
- * acct_auto_close - turn off a filesystem's accounting if it is on
- * @sb: super block for the filesystem
- *
- * If the accounting is turned on for a file in the filesystem pointed
- * to by sb, turn accounting off.
- */
-void acct_auto_close(struct super_block *sb)
+void acct_auto_close(struct hlist_head *list)
{
- struct bsd_acct_struct *acct;
-
- spin_lock(&acct_lock);
-restart:
- list_for_each_entry(acct, &acct_list, list)
- if (acct->file->f_path.dentry->d_sb == sb) {
- acct->count++;
- spin_unlock(&acct_lock);
- mutex_lock(&acct->lock);
- if (!acct->ns) {
- mutex_unlock(&acct->lock);
- spin_lock(&acct_lock);
- if (!--acct->count)
- kfree(acct);
- goto restart;
- }
- acct_kill(acct, NULL);
- spin_lock(&acct_lock);
- goto restart;
- }
+ while (1) {
+ spin_lock(&acct_lock);
+ if (!list->first)
+ break;
+ acct_kill(__acct_get(hlist_entry(list->first,
+ struct bsd_acct_struct,
+ s_list)), NULL);
+ }
spin_unlock(&acct_lock);
}
void acct_exit_ns(struct pid_namespace *ns)
{
- acct_kill(acct_get(&ns->bacct), NULL);
+ acct_kill(acct_get(ns), NULL);
}
/*
@@ -602,7 +577,7 @@ void acct_collect(long exitcode, int group_dead)
static void slow_acct_process(struct pid_namespace *ns)
{
for ( ; ns; ns = ns->parent) {
- struct bsd_acct_struct *acct = acct_get(&ns->bacct);
+ struct bsd_acct_struct *acct = acct_get(ns);
if (acct) {
do_acct_process(acct);
mutex_unlock(&acct->lock);
generated by cgit v1.2.3 (git 2.39.1) at 2025-11-04 03:43:03 +0000