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authorAl Viro <viro@zeniv.linux.org.uk>2014-08-07 08:00:52 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-08-07 14:40:08 -0400
commit1629d0eb3ead0e0c49e4402049ec7b5b31b81cd7 (patch)
treef080a4025e9c9b6d2bea11da4c8aa49b3ea54869 /kernel/acct.c
parent215748e67d893169de9e62c3416e9e035e9e9c5f (diff)
downloadop-kernel-dev-1629d0eb3ead0e0c49e4402049ec7b5b31b81cd7.zip
op-kernel-dev-1629d0eb3ead0e0c49e4402049ec7b5b31b81cd7.tar.gz
start carving bsd_acct_struct up
pull generic parts into struct fs_pin. Eventually we want those to replace mnt_pin()/mnt_unpin() mess; that stuff will move to fs/*. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel/acct.c')
-rw-r--r--kernel/acct.c42
1 files changed, 23 insertions, 19 deletions
diff --git a/kernel/acct.c b/kernel/acct.c
index 2d9e04d..afeaaa6 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -78,7 +78,7 @@ int acct_parm[3] = {4, 2, 30};
*/
static void do_acct_process(struct bsd_acct_struct *acct);
-struct bsd_acct_struct {
+struct fs_pin {
atomic_long_t count;
union {
struct {
@@ -87,6 +87,10 @@ struct bsd_acct_struct {
};
struct rcu_head rcu;
};
+};
+
+struct bsd_acct_struct {
+ struct fs_pin pin;
struct mutex lock;
int active;
unsigned long needcheck;
@@ -96,9 +100,9 @@ struct bsd_acct_struct {
struct completion done;
};
-static void acct_free_rcu(struct rcu_head *head)
+static void pin_free_rcu(struct rcu_head *head)
{
- kfree(container_of(head, struct bsd_acct_struct, rcu));
+ kfree(container_of(head, struct fs_pin, rcu));
}
static DEFINE_SPINLOCK(acct_lock);
@@ -138,15 +142,15 @@ out:
return acct->active;
}
-static void acct_put(struct bsd_acct_struct *p)
+static void pin_put(struct fs_pin *p)
{
if (atomic_long_dec_and_test(&p->count))
- call_rcu(&p->rcu, acct_free_rcu);
+ call_rcu(&p->rcu, pin_free_rcu);
}
static struct bsd_acct_struct *__acct_get(struct bsd_acct_struct *res)
{
- if (!atomic_long_inc_not_zero(&res->count)) {
+ if (!atomic_long_inc_not_zero(&res->pin.count)) {
rcu_read_unlock();
cpu_relax();
return NULL;
@@ -155,7 +159,7 @@ static struct bsd_acct_struct *__acct_get(struct bsd_acct_struct *res)
mutex_lock(&res->lock);
if (!res->ns) {
mutex_unlock(&res->lock);
- acct_put(res);
+ pin_put(&res->pin);
return NULL;
}
return res;
@@ -200,22 +204,22 @@ static void acct_kill(struct bsd_acct_struct *acct,
schedule_work(&acct->work);
wait_for_completion(&acct->done);
spin_lock(&acct_lock);
- hlist_del(&acct->m_list);
- hlist_del(&acct->s_list);
+ hlist_del(&acct->pin.m_list);
+ hlist_del(&acct->pin.s_list);
spin_unlock(&acct_lock);
ns->bacct = new;
if (new) {
struct vfsmount *m = new->file->f_path.mnt;
spin_lock(&acct_lock);
- hlist_add_head(&new->s_list, &m->mnt_sb->s_pins);
- hlist_add_head(&new->m_list, &real_mount(m)->mnt_pins);
+ hlist_add_head(&new->pin.s_list, &m->mnt_sb->s_pins);
+ hlist_add_head(&new->pin.m_list, &real_mount(m)->mnt_pins);
spin_unlock(&acct_lock);
mutex_unlock(&new->lock);
}
acct->ns = NULL;
- atomic_long_dec(&acct->count);
+ atomic_long_dec(&acct->pin.count);
mutex_unlock(&acct->lock);
- acct_put(acct);
+ pin_put(&acct->pin);
}
}
@@ -249,7 +253,7 @@ static int acct_on(struct filename *pathname)
return -EIO;
}
- atomic_long_set(&acct->count, 1);
+ atomic_long_set(&acct->pin.count, 1);
acct->file = file;
acct->needcheck = jiffies;
acct->ns = ns;
@@ -264,8 +268,8 @@ static int acct_on(struct filename *pathname)
} else {
ns->bacct = acct;
spin_lock(&acct_lock);
- hlist_add_head(&acct->s_list, &mnt->mnt_sb->s_pins);
- hlist_add_head(&acct->m_list, &real_mount(mnt)->mnt_pins);
+ hlist_add_head(&acct->pin.s_list, &mnt->mnt_sb->s_pins);
+ hlist_add_head(&acct->pin.m_list, &real_mount(mnt)->mnt_pins);
spin_unlock(&acct_lock);
mutex_unlock(&acct->lock);
}
@@ -317,7 +321,7 @@ void acct_auto_close_mnt(struct hlist_head *list)
break;
acct_kill(__acct_get(hlist_entry(p,
struct bsd_acct_struct,
- m_list)), NULL);
+ pin.m_list)), NULL);
rcu_read_lock();
}
rcu_read_unlock();
@@ -332,7 +336,7 @@ void acct_auto_close(struct hlist_head *list)
break;
acct_kill(__acct_get(hlist_entry(p,
struct bsd_acct_struct,
- s_list)), NULL);
+ pin.s_list)), NULL);
rcu_read_lock();
}
rcu_read_unlock();
@@ -613,7 +617,7 @@ static void slow_acct_process(struct pid_namespace *ns)
if (acct) {
do_acct_process(acct);
mutex_unlock(&acct->lock);
- acct_put(acct);
+ pin_put(&acct->pin);
}
}
}
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