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take count and rcu_head out of fs_pin

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-01-10 12:47:38 -05:00
parent 360f54796e
commit 34cece2e8a
2 changed files with 10 additions and 14 deletions
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10
include/linux/fs_pin.h
View file

@ -1,14 +1,8 @@
#include <linux/fs.h> #include <linux/fs.h>
struct fs_pin { struct fs_pin {
atomic_long_t count; struct hlist_node s_list;
union { struct hlist_node m_list;
struct {
struct hlist_node s_list;
struct hlist_node m_list;
};
struct rcu_head rcu;
};
void (*kill)(struct fs_pin *); void (*kill)(struct fs_pin *);
}; };

14
kernel/acct.c
View file

@ -80,6 +80,8 @@ static void do_acct_process(struct bsd_acct_struct *acct);
struct bsd_acct_struct { struct bsd_acct_struct {
struct fs_pin pin; struct fs_pin pin;
atomic_long_t count;
struct rcu_head rcu;
struct mutex lock; struct mutex lock;
int active; int active;
unsigned long needcheck; unsigned long needcheck;
@ -126,8 +128,8 @@ static int check_free_space(struct bsd_acct_struct *acct)
static void acct_put(struct bsd_acct_struct *p) static void acct_put(struct bsd_acct_struct *p)
{ {
if (atomic_long_dec_and_test(&p->pin.count)) if (atomic_long_dec_and_test(&p->count))
kfree_rcu(p, pin.rcu); kfree_rcu(p, rcu);
} }
static struct bsd_acct_struct *acct_get(struct pid_namespace *ns) static struct bsd_acct_struct *acct_get(struct pid_namespace *ns)
@ -141,7 +143,7 @@ static struct bsd_acct_struct *acct_get(struct pid_namespace *ns)
rcu_read_unlock(); rcu_read_unlock();
return NULL; return NULL;
} }
if (!atomic_long_inc_not_zero(&res->pin.count)) { if (!atomic_long_inc_not_zero(&res->count)) {
rcu_read_unlock(); rcu_read_unlock();
cpu_relax(); cpu_relax();
goto again; goto again;
@ -179,7 +181,7 @@ static void acct_kill(struct bsd_acct_struct *acct,
pin_remove(&acct->pin); pin_remove(&acct->pin);
ns->bacct = new; ns->bacct = new;
acct->ns = NULL; acct->ns = NULL;
atomic_long_dec(&acct->pin.count); atomic_long_dec(&acct->count);
mutex_unlock(&acct->lock); mutex_unlock(&acct->lock);
acct_put(acct); acct_put(acct);
} }
@ -189,7 +191,7 @@ static void acct_pin_kill(struct fs_pin *pin)
{ {
struct bsd_acct_struct *acct; struct bsd_acct_struct *acct;
acct = container_of(pin, struct bsd_acct_struct, pin); acct = container_of(pin, struct bsd_acct_struct, pin);
if (!atomic_long_inc_not_zero(&pin->count)) { if (!atomic_long_inc_not_zero(&acct->count)) {
rcu_read_unlock(); rcu_read_unlock();
cpu_relax(); cpu_relax();
return; return;
@ -250,7 +252,7 @@ static int acct_on(struct filename *pathname)
mnt = file->f_path.mnt; mnt = file->f_path.mnt;
file->f_path.mnt = internal; file->f_path.mnt = internal;
atomic_long_set(&acct->pin.count, 1); atomic_long_set(&acct->count, 1);
acct->pin.kill = acct_pin_kill; acct->pin.kill = acct_pin_kill;
acct->file = file; acct->file = file;
acct->needcheck = jiffies; acct->needcheck = jiffies;