nohz: Fix stale jiffies update in tick_nohz_restart()

[linux-flexiantxendom0-3.2.10.git] / kernel / acct.c

diff --git a/kernel/acct.c b/kernel/acct.c
index 9e53bb2..02e6167 100644 (file)
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -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)
@@ -112,23 +102,23 @@ 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);
 
        /* May block */
-       if (vfs_statfs(file->f_path.dentry, &sbuf))
+       if (vfs_statfs(&file->f_path, &sbuf))
                return res;
        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);
@@ -334,7 +315,7 @@ void acct_auto_close(struct super_block *sb)
        spin_lock(&acct_lock);
 restart:
        list_for_each_entry(acct, &acct_list, list)
-               if (acct->file && acct->file->f_path.mnt->mnt_sb == sb) {
+               if (acct->file && acct->file->f_path.dentry->d_sb == sb) {
                        acct_file_reopen(acct, NULL, NULL);
                        goto restart;
                }
@@ -343,17 +324,17 @@ restart:
 
 void acct_exit_ns(struct pid_namespace *ns)
 {
-       struct bsd_acct_struct *acct;
+       struct bsd_acct_struct *acct = ns->bacct;
 
-       spin_lock(&acct_lock);
-       acct = ns->bacct;
-       if (acct != NULL) {
-               if (acct->file != NULL)
-                       acct_file_reopen(acct, NULL, NULL);
+       if (acct == NULL)
+               return;
 
-               kfree(acct);
-       }
+       spin_lock(&acct_lock);
+       if (acct->file != NULL)
+               acct_file_reopen(acct, NULL, NULL);
        spin_unlock(&acct_lock);
+
+       kfree(acct);
 }
 
 /*
@@ -497,7 +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));
@@ -612,8 +593,8 @@ void acct_collect(long exitcode, int group_dead)
                pacct->ac_flag |= ACORE;
        if (current->flags & PF_SIGNALED)
                pacct->ac_flag |= AXSIG;
-       pacct->ac_utime = cputime_add(pacct->ac_utime, current->utime);
-       pacct->ac_stime = cputime_add(pacct->ac_stime, current->stime);
+       pacct->ac_utime += current->utime;
+       pacct->ac_stime += current->stime;
        pacct->ac_minflt += current->min_flt;
        pacct->ac_majflt += current->maj_flt;
        spin_unlock_irq(&current->sighand->siglock);