get rid of timer in kern/acct.c
Al Viro [Fri, 9 Dec 2011 01:08:42 +0000 (20:08 -0500)]
... and clean it up a bit, while we are at it

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

kernel/acct.c

index fa7eb3d..8cba124 100644 (file)
@@ -84,11 +84,10 @@ static void do_acct_process(struct bsd_acct_struct *acct,
  * the cache line to have the data after getting the lock.
  */
 struct bsd_acct_struct {
-       volatile int            active;
-       volatile int            needcheck;
+       int                     active;
+       unsigned long           needcheck;
        struct file             *file;
        struct pid_namespace    *ns;
-       struct timer_list       timer;
        struct list_head        list;
 };
 
@@ -96,15 +95,6 @@ static DEFINE_SPINLOCK(acct_lock);
 static LIST_HEAD(acct_list);
 
 /*
- * Called whenever the timer says to check the free space.
- */
-static void acct_timeout(unsigned long x)
-{
-       struct bsd_acct_struct *acct = (struct bsd_acct_struct *)x;
-       acct->needcheck = 1;
-}
-
-/*
  * Check the amount of free space and suspend/resume accordingly.
  */
 static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
@@ -112,12 +102,12 @@ static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
        struct kstatfs sbuf;
        int res;
        int act;
-       sector_t resume;
-       sector_t suspend;
+       u64 resume;
+       u64 suspend;
 
        spin_lock(&acct_lock);
        res = acct->active;
-       if (!file || !acct->needcheck)
+       if (!file || time_is_before_jiffies(acct->needcheck))
                goto out;
        spin_unlock(&acct_lock);
 
@@ -127,8 +117,8 @@ static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
        suspend = sbuf.f_blocks * SUSPEND;
        resume = sbuf.f_blocks * RESUME;
 
-       sector_div(suspend, 100);
-       sector_div(resume, 100);
+       do_div(suspend, 100);
+       do_div(resume, 100);
 
        if (sbuf.f_bavail <= suspend)
                act = -1;
@@ -160,10 +150,7 @@ static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
                }
        }
 
-       del_timer(&acct->timer);
-       acct->needcheck = 0;
-       acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ;
-       add_timer(&acct->timer);
+       acct->needcheck = jiffies + ACCT_TIMEOUT*HZ;
        res = acct->active;
 out:
        spin_unlock(&acct_lock);
@@ -185,9 +172,7 @@ static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
        if (acct->file) {
                old_acct = acct->file;
                old_ns = acct->ns;
-               del_timer(&acct->timer);
                acct->active = 0;
-               acct->needcheck = 0;
                acct->file = NULL;
                acct->ns = NULL;
                list_del(&acct->list);
@@ -195,13 +180,9 @@ static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
        if (file) {
                acct->file = file;
                acct->ns = ns;
-               acct->needcheck = 0;
+               acct->needcheck = jiffies + ACCT_TIMEOUT*HZ;
                acct->active = 1;
                list_add(&acct->list, &acct_list);
-               /* It's been deleted if it was used before so this is safe */
-               setup_timer(&acct->timer, acct_timeout, (unsigned long)acct);
-               acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ;
-               add_timer(&acct->timer);
        }
        if (old_acct) {
                mnt_unpin(old_acct->f_path.mnt);
@@ -348,7 +329,6 @@ void acct_exit_ns(struct pid_namespace *ns)
        if (acct == NULL)
                return;
 
-       del_timer_sync(&acct->timer);
        spin_lock(&acct_lock);
        if (acct->file != NULL)
                acct_file_reopen(acct, NULL, NULL);
@@ -498,7 +478,7 @@ static void do_acct_process(struct bsd_acct_struct *acct,
         * Fill the accounting struct with the needed info as recorded
         * by the different kernel functions.
         */
-       memset((caddr_t)&ac, 0, sizeof(acct_t));
+       memset(&ac, 0, sizeof(acct_t));
 
        ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER;
        strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm));