/*
* Close the old accouting file (if currently open) and then replace
* it with file (if non-NULL).
*
* NOTE: acct_globals.lock MUST be held on entry and exit.
*/
static void acct_file_reopen(struct file *file)
{
struct file *old_acct = NULL;
if (acct_globals.file) {
old_acct = acct_globals.file;
del_timer(&acct_globals.timer);
acct_globals.active = 0;
acct_globals.needcheck = 0;
acct_globals.file = NULL;
}
if (file) {
acct_globals.file = file;
acct_globals.needcheck = 0;
acct_globals.active = 1;
/* It's been deleted if it was used before so this is safe */
init_timer(&acct_globals.timer);
acct_globals.timer.function = acct_timeout;
acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ;
add_timer(&acct_globals.timer);
}
if (old_acct) {
spin_unlock(&acct_globals.lock);
do_acct_process(0, old_acct);
filp_close(old_acct, NULL);
spin_lock(&acct_globals.lock);
}
}
/*
* Close the old accounting file (if currently open) and then replace
* it with file (if non-NULL).
*
* NOTE: acct_lock MUST be held on entry and exit.
*/
static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
struct pid_namespace *ns)
{
struct file *old_acct = NULL;
struct pid_namespace *old_ns = 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;
acct->ns = NULL;
list_del(&acct->list);
}
if (file) {
acct->file = file;
acct->ns = ns;
acct->needcheck = 0;
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);
spin_unlock(&acct_lock);
do_acct_process(acct, old_ns, old_acct);
filp_close(old_acct, NULL);
spin_lock(&acct_lock);
}
}
/*
* Close the old accounting file (if currently open) and then replace
* it with file (if non-NULL).
*
* NOTE: acct_lock MUST be held on entry and exit.
*/
static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
struct pid_namespace *ns)
{
struct file *old_acct = NULL;
struct pid_namespace *old_ns = NULL;
if (acct->file) {
old_acct = acct->file;
old_ns = acct->ns;
acct->active = 0;
acct->file = NULL;
acct->ns = NULL;
list_del(&acct->list);
}
if (file) {
acct->file = file;
acct->ns = ns;
acct->needcheck = jiffies + ACCT_TIMEOUT*HZ;
acct->active = 1;
list_add(&acct->list, &acct_list);
}
if (old_acct) {
mnt_unpin(old_acct->f_path.mnt);
spin_unlock(&acct_lock);
do_acct_process(acct, old_ns, old_acct);
filp_close(old_acct, NULL);
spin_lock(&acct_lock);
}
}
/*
* sys_acct() is the only system call needed to implement process
* accounting. It takes the name of the file where accounting records
* should be written. If the filename is NULL, accounting will be
* shutdown.
*/
asmlinkage long sys_acct(const char *name)
{
struct file *file = NULL, *old_acct = NULL;
char *tmp;
int error;
if (!capable(CAP_SYS_PACCT))
return -EPERM;
if (name) {
tmp = getname(name);
error = PTR_ERR(tmp);
if (IS_ERR(tmp))
goto out;
/* Difference from BSD - they don't do O_APPEND */
file = filp_open(tmp, O_WRONLY|O_APPEND, 0);
putname(tmp);
if (IS_ERR(file)) {
error = PTR_ERR(file);
goto out;
}
error = -EACCES;
if (!S_ISREG(file->f_dentry->d_inode->i_mode))
goto out_err;
error = -EIO;
if (!file->f_op->write)
goto out_err;
}
error = 0;
lock_kernel();
if (acct_file) {
old_acct = acct_file;
del_timer(&acct_timer);
acct_active = 0;
acct_needcheck = 0;
acct_file = NULL;
}
if (name) {
acct_file = file;
acct_needcheck = 0;
acct_active = 1;
/* It's been deleted if it was used before so this is safe */
init_timer(&acct_timer);
acct_timer.function = acct_timeout;
acct_timer.expires = jiffies + ACCT_TIMEOUT*HZ;
add_timer(&acct_timer);
}
unlock_kernel();
if (old_acct) {
do_acct_process(0,old_acct);
filp_close(old_acct, NULL);
}
out:
return error;
out_err:
filp_close(file, NULL);
goto out;
}
/*
* Close the old accounting file (if currently open) and then replace
* it with file (if non-NULL).
*
* NOTE: acct_globals.lock MUST be held on entry and exit.
*/
static void acct_file_reopen(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 (file) {
acct_globals.file = file;
acct_globals.ns = get_pid_ns(task_active_pid_ns(current));
acct_globals.needcheck = 0;
acct_globals.active = 1;
/* It's been deleted if it was used before so this is safe */
init_timer(&acct_globals.timer);
acct_globals.timer.function = acct_timeout;
acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ;
add_timer(&acct_globals.timer);
}
if (old_acct) {
mnt_unpin(old_acct->f_path.mnt);
spin_unlock(&acct_globals.lock);
do_acct_process(old_ns, old_acct);
filp_close(old_acct, NULL);
put_pid_ns(old_ns);
spin_lock(&acct_globals.lock);
}
}
/*
* sys_acct() is the only system call needed to implement process
* accounting. It takes the name of the file where accounting records
* should be written. If the filename is NULL, accounting will be
* shutdown.
*/
asmlinkage int sys_acct(const char *name)
{
struct file *file = NULL, *old_acct = NULL;
char *tmp;
int error = -EPERM;
lock_kernel();
if (!capable(CAP_SYS_PACCT))
goto out;
if (name) {
tmp = getname(name);
error = PTR_ERR(tmp);
if (IS_ERR(tmp))
goto out;
/* Difference from BSD - they don't do O_APPEND */
file = filp_open(tmp, O_WRONLY|O_APPEND, 0);
putname(tmp);
if (IS_ERR(file)) {
error = PTR_ERR(file);
goto out;
}
error = -EACCES;
if (!S_ISREG(file->f_dentry->d_inode->i_mode))
goto out_err;
error = -EIO;
if (!file->f_op->write)
goto out_err;
}
error = 0;
if (acct_file) {
old_acct = acct_file;
del_timer(&acct_timer);
acct_active = 0;
acct_needcheck = 0;
acct_file = NULL;
}
if (name) {
acct_file = file;
acct_needcheck = 0;
acct_active = 1;
acct_timer.expires = jiffies + ACCT_TIMEOUT*HZ;
add_timer(&acct_timer);
}
if (old_acct) {
do_acct_process(0,old_acct);
fput(old_acct);
}
out:
unlock_kernel();
return error;
out_err:
fput(file);
goto out;
}
static void acct_pin_kill(struct fs_pin *pin)
{
struct bsd_acct_struct *acct = to_acct(pin);
mutex_lock(&acct->lock);
do_acct_process(acct);
schedule_work(&acct->work);
wait_for_completion(&acct->done);
cmpxchg(&acct->ns->bacct, pin, NULL);
mutex_unlock(&acct->lock);
pin_remove(pin);
acct_put(acct);
}
