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Date: Thu, 15 May 2008 15:07:04 +0400
From: Pavel Emelyanov <xemul@...nvz.org>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Oleg Nesterov <oleg@...sign.ru>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 7/10] Bsdacct: make internal code work with passed bsd_acct_struct,
not global
This adds the appropriate pointer to all the internal (i.e. static)
functions that work with global acct instance. API calls pass a global
instance to them (while we still have such).
Mostly this is a s/acct_globals./acct->/ over the file.
Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
---
kernel/acct.c | 77 +++++++++++++++++++++++++++++----------------------------
1 files changed, 39 insertions(+), 38 deletions(-)
diff --git a/kernel/acct.c b/kernel/acct.c
index fc71c13..72d4760 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -75,7 +75,8 @@ int acct_parm[3] = {4, 2, 30};
/*
* External references and all of the globals.
*/
-static void do_acct_process(struct pid_namespace *ns, struct file *);
+static void do_acct_process(struct bsd_acct_struct *acct,
+ struct pid_namespace *ns, struct file *);
/*
* This structure is used so that all the data protected by lock
@@ -106,7 +107,7 @@ static void acct_timeout(unsigned long x)
/*
* Check the amount of free space and suspend/resume accordingly.
*/
-static int check_free_space(struct file *file)
+static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
{
struct kstatfs sbuf;
int res;
@@ -115,8 +116,8 @@ static int check_free_space(struct file *file)
sector_t suspend;
spin_lock(&acct_lock);
- res = acct_globals.active;
- if (!file || !acct_globals.needcheck)
+ res = acct->active;
+ if (!file || !acct->needcheck)
goto out;
spin_unlock(&acct_lock);
@@ -137,33 +138,33 @@ static int check_free_space(struct file *file)
act = 0;
/*
- * If some joker switched acct_globals.file under us we'ld better be
+ * If some joker switched acct->file under us we'ld better be
* silent and _not_ touch anything.
*/
spin_lock(&acct_lock);
- if (file != acct_globals.file) {
+ if (file != acct->file) {
if (act)
res = act>0;
goto out;
}
- if (acct_globals.active) {
+ if (acct->active) {
if (act < 0) {
- acct_globals.active = 0;
+ acct->active = 0;
printk(KERN_INFO "Process accounting paused\n");
}
} else {
if (act > 0) {
- acct_globals.active = 1;
+ acct->active = 1;
printk(KERN_INFO "Process accounting resumed\n");
}
}
- del_timer(&acct_globals.timer);
- acct_globals.needcheck = 0;
- acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ;
- add_timer(&acct_globals.timer);
- res = acct_globals.active;
+ del_timer(&acct->timer);
+ acct->needcheck = 0;
+ acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ;
+ add_timer(&acct->timer);
+ res = acct->active;
out:
spin_unlock(&acct_lock);
return res;
@@ -175,34 +176,33 @@ out:
*
* NOTE: acct_lock MUST be held on entry and exit.
*/
-static void acct_file_reopen(struct file *file)
+static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file)
{
struct file *old_acct = NULL;
struct pid_namespace *old_ns = NULL;
- if (acct_globals.file) {
- old_acct = acct_globals.file;
- old_ns = acct_globals.ns;
- del_timer(&acct_globals.timer);
- acct_globals.active = 0;
- acct_globals.needcheck = 0;
- acct_globals.file = NULL;
+ if (acct->file) {
+ old_acct = acct->file;
+ old_ns = acct->ns;
+ del_timer(&acct->timer);
+ acct->active = 0;
+ acct->needcheck = 0;
+ acct->file = NULL;
}
if (file) {
- acct_globals.file = file;
- acct_globals.ns = get_pid_ns(task_active_pid_ns(current));
- acct_globals.needcheck = 0;
- acct_globals.active = 1;
+ acct->file = file;
+ acct->ns = get_pid_ns(task_active_pid_ns(current));
+ acct->needcheck = 0;
+ acct->active = 1;
/* It's been deleted if it was used before so this is safe */
- setup_timer(&acct_globals.timer, acct_timeout,
- (unsigned long)&acct_globals);
- acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ;
- add_timer(&acct_globals.timer);
+ 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);
spin_unlock(&acct_lock);
- do_acct_process(old_ns, old_acct);
+ do_acct_process(acct, old_ns, old_acct);
filp_close(old_acct, NULL);
put_pid_ns(old_ns);
spin_lock(&acct_lock);
@@ -237,7 +237,7 @@ static int acct_on(char *name)
spin_lock(&acct_lock);
mnt_pin(file->f_path.mnt);
- acct_file_reopen(file);
+ acct_file_reopen(&acct_globals, file);
spin_unlock(&acct_lock);
mntput(file->f_path.mnt); /* it's pinned, now give up active reference */
@@ -273,7 +273,7 @@ asmlinkage long sys_acct(const char __user *name)
error = security_acct(NULL);
if (!error) {
spin_lock(&acct_lock);
- acct_file_reopen(NULL);
+ acct_file_reopen(&acct_globals, NULL);
spin_unlock(&acct_lock);
}
}
@@ -291,7 +291,7 @@ void acct_auto_close_mnt(struct vfsmount *m)
{
spin_lock(&acct_lock);
if (acct_globals.file && acct_globals.file->f_path.mnt == m)
- acct_file_reopen(NULL);
+ acct_file_reopen(&acct_globals, NULL);
spin_unlock(&acct_lock);
}
@@ -307,7 +307,7 @@ void acct_auto_close(struct super_block *sb)
spin_lock(&acct_lock);
if (acct_globals.file &&
acct_globals.file->f_path.mnt->mnt_sb == sb) {
- acct_file_reopen(NULL);
+ acct_file_reopen(&acct_globals, NULL);
}
spin_unlock(&acct_lock);
}
@@ -426,7 +426,8 @@ static u32 encode_float(u64 value)
/*
* do_acct_process does all actual work. Caller holds the reference to file.
*/
-static void do_acct_process(struct pid_namespace *ns, struct file *file)
+static void do_acct_process(struct bsd_acct_struct *acct,
+ struct pid_namespace *ns, struct file *file)
{
struct pacct_struct *pacct = ¤t->signal->pacct;
acct_t ac;
@@ -441,7 +442,7 @@ static void do_acct_process(struct pid_namespace *ns, struct file *file)
* First check to see if there is enough free_space to continue
* the process accounting system.
*/
- if (!check_free_space(file))
+ if (!check_free_space(acct, file))
return;
/*
@@ -604,7 +605,7 @@ void acct_process(void)
ns = get_pid_ns(acct_globals.ns);
spin_unlock(&acct_lock);
- do_acct_process(ns, file);
+ do_acct_process(&acct_globals, ns, file);
fput(file);
put_pid_ns(ns);
}
--
1.5.3.4
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