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get rid of timer in kern/acct.c

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... and clean it up a bit, while we are at it

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-12-08 20:08:42 -05:00
parent 84b92d39f9
commit 32dc730860
1 changed files with 10 additions and 30 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

40
kernel/acct.c
View file

@ -84,26 +84,16 @@ static void do_acct_process(struct bsd_acct_struct *acct,
* the cache line to have the data after getting the lock. * the cache line to have the data after getting the lock.
*/ */
struct bsd_acct_struct { struct bsd_acct_struct {
volatile int active; int active;
volatile int needcheck; unsigned long needcheck;
struct file *file; struct file *file;
struct pid_namespace *ns; struct pid_namespace *ns;
struct timer_list timer;
struct list_head list; struct list_head list;
}; };
static DEFINE_SPINLOCK(acct_lock); static DEFINE_SPINLOCK(acct_lock);
static LIST_HEAD(acct_list); 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. * Check the amount of free space and suspend/resume accordingly.
*/ */
@ -112,12 +102,12 @@ static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
struct kstatfs sbuf; struct kstatfs sbuf;
int res; int res;
int act; int act;
sector_t resume; u64 resume;
sector_t suspend; u64 suspend;
spin_lock(&acct_lock); spin_lock(&acct_lock);
res = acct->active; res = acct->active;
if (!file || !acct->needcheck) if (!file || time_is_before_jiffies(acct->needcheck))
goto out; goto out;
spin_unlock(&acct_lock); 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; suspend = sbuf.f_blocks * SUSPEND;
resume = sbuf.f_blocks * RESUME; resume = sbuf.f_blocks * RESUME;
sector_div(suspend, 100); do_div(suspend, 100);
sector_div(resume, 100); do_div(resume, 100);
if (sbuf.f_bavail <= suspend) if (sbuf.f_bavail <= suspend)
act = -1; 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 = jiffies + ACCT_TIMEOUT*HZ;
acct->needcheck = 0;
acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ;
add_timer(&acct->timer);
res = acct->active; res = acct->active;
out: out:
spin_unlock(&acct_lock); spin_unlock(&acct_lock);
@ -185,9 +172,7 @@ static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
if (acct->file) { if (acct->file) {
old_acct = acct->file; old_acct = acct->file;
old_ns = acct->ns; old_ns = acct->ns;
del_timer(&acct->timer);
acct->active = 0; acct->active = 0;
acct->needcheck = 0;
acct->file = NULL; acct->file = NULL;
acct->ns = NULL; acct->ns = NULL;
list_del(&acct->list); list_del(&acct->list);
@ -195,13 +180,9 @@ static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
if (file) { if (file) {
acct->file = file; acct->file = file;
acct->ns = ns; acct->ns = ns;
acct->needcheck = 0; acct->needcheck = jiffies + ACCT_TIMEOUT*HZ;
acct->active = 1; acct->active = 1;
list_add(&acct->list, &acct_list); 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) { if (old_acct) {
mnt_unpin(old_acct->f_path.mnt); mnt_unpin(old_acct->f_path.mnt);
@ -348,7 +329,6 @@ void acct_exit_ns(struct pid_namespace *ns)
if (acct == NULL) if (acct == NULL)
return; return;
del_timer_sync(&acct->timer);
spin_lock(&acct_lock); spin_lock(&acct_lock);
if (acct->file != NULL) if (acct->file != NULL)
acct_file_reopen(acct, NULL, 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 * Fill the accounting struct with the needed info as recorded
* by the different kernel functions. * 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; ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER;
strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm)); strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm));