diff options
Diffstat (limited to 'kernel/acct.c')
-rw-r--r-- | kernel/acct.c | 94 |
1 files changed, 63 insertions, 31 deletions
diff --git a/kernel/acct.c b/kernel/acct.c index b756f527497..6312d6bd43e 100644 --- a/kernel/acct.c +++ b/kernel/acct.c @@ -54,6 +54,7 @@ #include <linux/jiffies.h> #include <linux/times.h> #include <linux/syscalls.h> +#include <linux/mount.h> #include <asm/uaccess.h> #include <asm/div64.h> #include <linux/blkdev.h> /* sector_div */ @@ -192,6 +193,7 @@ static void acct_file_reopen(struct file *file) add_timer(&acct_globals.timer); } if (old_acct) { + mnt_unpin(old_acct->f_vfsmnt); spin_unlock(&acct_globals.lock); do_acct_process(0, old_acct); filp_close(old_acct, NULL); @@ -199,6 +201,42 @@ static void acct_file_reopen(struct file *file) } } +static int acct_on(char *name) +{ + struct file *file; + int error; + + /* Difference from BSD - they don't do O_APPEND */ + file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0); + if (IS_ERR(file)) + return PTR_ERR(file); + + if (!S_ISREG(file->f_dentry->d_inode->i_mode)) { + filp_close(file, NULL); + return -EACCES; + } + + if (!file->f_op->write) { + filp_close(file, NULL); + return -EIO; + } + + error = security_acct(file); + if (error) { + filp_close(file, NULL); + return error; + } + + spin_lock(&acct_globals.lock); + mnt_pin(file->f_vfsmnt); + acct_file_reopen(file); + spin_unlock(&acct_globals.lock); + + mntput(file->f_vfsmnt); /* it's pinned, now give up active reference */ + + return 0; +} + /** * sys_acct - enable/disable process accounting * @name: file name for accounting records or NULL to shutdown accounting @@ -212,47 +250,41 @@ static void acct_file_reopen(struct file *file) */ asmlinkage long sys_acct(const char __user *name) { - struct file *file = NULL; - char *tmp; int error; if (!capable(CAP_SYS_PACCT)) return -EPERM; if (name) { - tmp = getname(name); - if (IS_ERR(tmp)) { + char *tmp = getname(name); + if (IS_ERR(tmp)) return (PTR_ERR(tmp)); - } - /* Difference from BSD - they don't do O_APPEND */ - file = filp_open(tmp, O_WRONLY|O_APPEND|O_LARGEFILE, 0); + error = acct_on(tmp); putname(tmp); - if (IS_ERR(file)) { - return (PTR_ERR(file)); - } - if (!S_ISREG(file->f_dentry->d_inode->i_mode)) { - filp_close(file, NULL); - return (-EACCES); - } - - if (!file->f_op->write) { - filp_close(file, NULL); - return (-EIO); + } else { + error = security_acct(NULL); + if (!error) { + spin_lock(&acct_globals.lock); + acct_file_reopen(NULL); + spin_unlock(&acct_globals.lock); } } + return error; +} - error = security_acct(file); - if (error) { - if (file) - filp_close(file, NULL); - return error; - } - +/** + * acct_auto_close - turn off a filesystem's accounting if it is on + * @m: vfsmount being shut down + * + * If the accounting is turned on for a file in the subtree pointed to + * to by m, turn accounting off. Done when m is about to die. + */ +void acct_auto_close_mnt(struct vfsmount *m) +{ spin_lock(&acct_globals.lock); - acct_file_reopen(file); + if (acct_globals.file && acct_globals.file->f_vfsmnt == m) + acct_file_reopen(NULL); spin_unlock(&acct_globals.lock); - - return (0); } /** @@ -266,8 +298,8 @@ void acct_auto_close(struct super_block *sb) { spin_lock(&acct_globals.lock); if (acct_globals.file && - acct_globals.file->f_dentry->d_inode->i_sb == sb) { - acct_file_reopen((struct file *)NULL); + acct_globals.file->f_vfsmnt->mnt_sb == sb) { + acct_file_reopen(NULL); } spin_unlock(&acct_globals.lock); } @@ -553,7 +585,7 @@ void acct_update_integrals(struct task_struct *tsk) if (delta == 0) return; tsk->acct_stimexpd = tsk->stime; - tsk->acct_rss_mem1 += delta * get_mm_counter(tsk->mm, rss); + tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; } } |