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kernel/acct.c
15.4 KB
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/* * linux/kernel/acct.c * * BSD Process Accounting for Linux * * Author: Marco van Wieringen <mvw@planets.elm.net> * * Some code based on ideas and code from: * Thomas K. Dyas <tdyas@eden.rutgers.edu> * * This file implements BSD-style process accounting. Whenever any * process exits, an accounting record of type "struct acct" is * written to the file specified with the acct() system call. It is * up to user-level programs to do useful things with the accounting * log. The kernel just provides the raw accounting information. * * (C) Copyright 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V. * * Plugged two leaks. 1) It didn't return acct_file into the free_filps if * the file happened to be read-only. 2) If the accounting was suspended * due to the lack of space it happily allowed to reopen it and completely * lost the old acct_file. 3/10/98, Al Viro. * * Now we silently close acct_file on attempt to reopen. Cleaned sys_acct(). * XTerms and EMACS are manifestations of pure evil. 21/10/98, AV. * * Fixed a nasty interaction with with sys_umount(). If the accointing * was suspeneded we failed to stop it on umount(). Messy. * Another one: remount to readonly didn't stop accounting. * Question: what should we do if we have CAP_SYS_ADMIN but not * CAP_SYS_PACCT? Current code does the following: umount returns -EBUSY * unless we are messing with the root. In that case we are getting a * real mess with do_remount_sb(). 9/11/98, AV. * * Fixed a bunch of races (and pair of leaks). Probably not the best way, * but this one obviously doesn't introduce deadlocks. Later. BTW, found * one race (and leak) in BSD implementation. * OK, that's better. ANOTHER race and leak in BSD variant. There always * is one more bug... 10/11/98, AV. * * Oh, fsck... Oopsable SMP race in do_process_acct() - we must hold * ->mmap_sem to walk the vma list of current->mm. Nasty, since it leaks * a struct file opened for write. Fixed. 2/6/2000, AV. */ |
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#include <linux/mm.h> #include <linux/slab.h> #include <linux/acct.h> |
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#include <linux/capability.h> |
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#include <linux/file.h> #include <linux/tty.h> #include <linux/security.h> #include <linux/vfs.h> #include <linux/jiffies.h> #include <linux/times.h> #include <linux/syscalls.h> |
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#include <linux/mount.h> |
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#include <linux/uaccess.h> |
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#include <asm/div64.h> #include <linux/blkdev.h> /* sector_div */ |
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#include <linux/pid_namespace.h> |
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#include <linux/fs_pin.h> |
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/* * These constants control the amount of freespace that suspend and * resume the process accounting system, and the time delay between * each check. * Turned into sysctl-controllable parameters. AV, 12/11/98 */ int acct_parm[3] = {4, 2, 30}; #define RESUME (acct_parm[0]) /* >foo% free space - resume */ #define SUSPEND (acct_parm[1]) /* <foo% free space - suspend */ #define ACCT_TIMEOUT (acct_parm[2]) /* foo second timeout between checks */ /* * External references and all of the globals. */ |
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|
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struct bsd_acct_struct { struct fs_pin pin; |
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atomic_long_t count; struct rcu_head rcu; |
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struct mutex lock; |
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int active; unsigned long needcheck; |
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struct file *file; |
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struct pid_namespace *ns; |
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struct work_struct work; struct completion done; |
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}; |
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static void do_acct_process(struct bsd_acct_struct *acct); |
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/* |
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* Check the amount of free space and suspend/resume accordingly. */ |
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static int check_free_space(struct bsd_acct_struct *acct) |
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{ struct kstatfs sbuf; |
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|
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if (time_is_before_jiffies(acct->needcheck)) |
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goto out; |
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/* May block */ |
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if (vfs_statfs(&acct->file->f_path, &sbuf)) |
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goto out; |
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|
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if (acct->active) { |
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u64 suspend = sbuf.f_blocks * SUSPEND; do_div(suspend, 100); if (sbuf.f_bavail <= suspend) { |
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acct->active = 0; |
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pr_info("Process accounting paused "); |
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} } else { |
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u64 resume = sbuf.f_blocks * RESUME; do_div(resume, 100); if (sbuf.f_bavail >= resume) { |
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acct->active = 1; |
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pr_info("Process accounting resumed "); |
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} } |
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acct->needcheck = jiffies + ACCT_TIMEOUT*HZ; |
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out: |
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return acct->active; |
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} |
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static void acct_put(struct bsd_acct_struct *p) { |
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if (atomic_long_dec_and_test(&p->count)) kfree_rcu(p, rcu); |
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} |
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static inline struct bsd_acct_struct *to_acct(struct fs_pin *p) { return p ? container_of(p, struct bsd_acct_struct, pin) : NULL; } |
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static struct bsd_acct_struct *acct_get(struct pid_namespace *ns) |
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{ struct bsd_acct_struct *res; |
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again: |
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smp_rmb(); rcu_read_lock(); |
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res = to_acct(ACCESS_ONCE(ns->bacct)); |
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if (!res) { rcu_read_unlock(); |
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return NULL; |
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} |
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if (!atomic_long_inc_not_zero(&res->count)) { |
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rcu_read_unlock(); cpu_relax(); |
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goto again; |
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} rcu_read_unlock(); mutex_lock(&res->lock); |
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if (res != to_acct(ACCESS_ONCE(ns->bacct))) { |
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mutex_unlock(&res->lock); |
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acct_put(res); |
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goto again; } |
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return res; } |
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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); } |
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static void close_work(struct work_struct *work) { struct bsd_acct_struct *acct = container_of(work, struct bsd_acct_struct, work); struct file *file = acct->file; |
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if (file->f_op->flush) file->f_op->flush(file, NULL); __fput_sync(file); complete(&acct->done); } |
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static int acct_on(struct filename *pathname) |
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{ struct file *file; |
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struct vfsmount *mnt, *internal; |
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struct pid_namespace *ns = task_active_pid_ns(current); |
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struct bsd_acct_struct *acct; struct fs_pin *old; |
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int err; |
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acct = kzalloc(sizeof(struct bsd_acct_struct), GFP_KERNEL); if (!acct) return -ENOMEM; |
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/* Difference from BSD - they don't do O_APPEND */ |
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file = file_open_name(pathname, O_WRONLY|O_APPEND|O_LARGEFILE, 0); |
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if (IS_ERR(file)) { kfree(acct); |
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return PTR_ERR(file); |
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} |
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|
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if (!S_ISREG(file_inode(file)->i_mode)) { |
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kfree(acct); |
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filp_close(file, NULL); return -EACCES; } |
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if (!(file->f_mode & FMODE_CAN_WRITE)) { |
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kfree(acct); |
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filp_close(file, NULL); return -EIO; } |
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internal = mnt_clone_internal(&file->f_path); if (IS_ERR(internal)) { kfree(acct); filp_close(file, NULL); return PTR_ERR(internal); } err = mnt_want_write(internal); if (err) { mntput(internal); kfree(acct); filp_close(file, NULL); return err; } mnt = file->f_path.mnt; file->f_path.mnt = internal; |
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|
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atomic_long_set(&acct->count, 1); |
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init_fs_pin(&acct->pin, acct_pin_kill); |
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acct->file = file; acct->needcheck = jiffies; acct->ns = ns; mutex_init(&acct->lock); |
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INIT_WORK(&acct->work, close_work); init_completion(&acct->done); |
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mutex_lock_nested(&acct->lock, 1); /* nobody has seen it yet */ pin_insert(&acct->pin, mnt); |
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|
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rcu_read_lock(); old = xchg(&ns->bacct, &acct->pin); |
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mutex_unlock(&acct->lock); |
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pin_kill(old); |
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mnt_drop_write(mnt); mntput(mnt); |
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return 0; } |
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static DEFINE_MUTEX(acct_on_mutex); |
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/** * sys_acct - enable/disable process accounting * @name: file name for accounting records or NULL to shutdown accounting * * Returns 0 for success or negative errno values for failure. * * 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. |
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*/ |
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SYSCALL_DEFINE1(acct, const char __user *, name) |
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{ |
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int error = 0; |
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if (!capable(CAP_SYS_PACCT)) return -EPERM; if (name) { |
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struct filename *tmp = getname(name); |
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|
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if (IS_ERR(tmp)) |
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return PTR_ERR(tmp); |
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mutex_lock(&acct_on_mutex); |
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error = acct_on(tmp); |
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mutex_unlock(&acct_on_mutex); |
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putname(tmp); |
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} else { |
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rcu_read_lock(); pin_kill(task_active_pid_ns(current)->bacct); |
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} |
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|
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return error; } |
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|
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void acct_exit_ns(struct pid_namespace *ns) { |
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rcu_read_lock(); pin_kill(ns->bacct); |
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} /* * encode an unsigned long into a comp_t * * This routine has been adopted from the encode_comp_t() function in * the kern_acct.c file of the FreeBSD operating system. The encoding * is a 13-bit fraction with a 3-bit (base 8) exponent. */ #define MANTSIZE 13 /* 13 bit mantissa. */ #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ static comp_t encode_comp_t(unsigned long value) { int exp, rnd; exp = rnd = 0; while (value > MAXFRACT) { rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */ value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ exp++; } /* |
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* If we need to round up, do it (and handle overflow correctly). */ |
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if (rnd && (++value > MAXFRACT)) { value >>= EXPSIZE; exp++; } /* |
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* Clean it up and polish it off. */ |
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exp <<= MANTSIZE; /* Shift the exponent into place */ exp += value; /* and add on the mantissa. */ return exp; } |
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#if ACCT_VERSION == 1 || ACCT_VERSION == 2 |
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/* * encode an u64 into a comp2_t (24 bits) * * Format: 5 bit base 2 exponent, 20 bits mantissa. * The leading bit of the mantissa is not stored, but implied for * non-zero exponents. * Largest encodable value is 50 bits. */ #define MANTSIZE2 20 /* 20 bit mantissa. */ #define EXPSIZE2 5 /* 5 bit base 2 exponent. */ #define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */ |
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#define MAXEXP2 ((1 << EXPSIZE2) - 1) /* Maximum exponent. */ |
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static comp2_t encode_comp2_t(u64 value) { |
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int exp, rnd; exp = (value > (MAXFRACT2>>1)); rnd = 0; while (value > MAXFRACT2) { rnd = value & 1; value >>= 1; exp++; } /* * If we need to round up, do it (and handle overflow correctly). */ if (rnd && (++value > MAXFRACT2)) { value >>= 1; exp++; } if (exp > MAXEXP2) { /* Overflow. Return largest representable number instead. */ return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1; } else { return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1)); } |
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} #endif |
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#if ACCT_VERSION == 3 |
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/* * encode an u64 into a 32 bit IEEE float */ static u32 encode_float(u64 value) { unsigned exp = 190; unsigned u; |
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if (value == 0) return 0; while ((s64)value > 0) { |
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value <<= 1; exp--; } u = (u32)(value >> 40) & 0x7fffffu; return u | (exp << 23); } #endif /* * Write an accounting entry for an exiting process * * The acct_process() call is the workhorse of the process * accounting system. The struct acct is built here and then written * into the accounting file. This function should only be called from |
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* do_exit() or when switching to a different output file. |
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*/ |
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static void fill_ac(acct_t *ac) |
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{ |
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struct pacct_struct *pacct = ¤t->signal->pacct; |
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u64 elapsed, run_time; |
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struct tty_struct *tty; |
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/* * Fill the accounting struct with the needed info as recorded * by the different kernel functions. */ |
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memset(ac, 0, sizeof(acct_t)); |
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|
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ac->ac_version = ACCT_VERSION | ACCT_BYTEORDER; strlcpy(ac->ac_comm, current->comm, sizeof(ac->ac_comm)); |
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/* calculate run_time in nsec*/ |
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run_time = ktime_get_ns(); run_time -= current->group_leader->start_time; |
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/* convert nsec -> AHZ */ elapsed = nsec_to_AHZ(run_time); |
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#if ACCT_VERSION == 3 |
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ac->ac_etime = encode_float(elapsed); |
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#else |
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ac->ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ? |
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(unsigned long) elapsed : (unsigned long) -1l); |
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#endif |
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#if ACCT_VERSION == 1 || ACCT_VERSION == 2 |
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{ /* new enlarged etime field */ comp2_t etime = encode_comp2_t(elapsed); |
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|
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ac->ac_etime_hi = etime >> 16; ac->ac_etime_lo = (u16) etime; |
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} #endif do_div(elapsed, AHZ); |
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ac->ac_btime = get_seconds() - elapsed; #if ACCT_VERSION==2 ac->ac_ahz = AHZ; #endif spin_lock_irq(¤t->sighand->siglock); tty = current->signal->tty; /* Safe as we hold the siglock */ ac->ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0; ac->ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); ac->ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime))); ac->ac_flag = pacct->ac_flag; ac->ac_mem = encode_comp_t(pacct->ac_mem); ac->ac_minflt = encode_comp_t(pacct->ac_minflt); ac->ac_majflt = encode_comp_t(pacct->ac_majflt); ac->ac_exitcode = pacct->ac_exitcode; spin_unlock_irq(¤t->sighand->siglock); } /* * do_acct_process does all actual work. Caller holds the reference to file. */ |
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static void do_acct_process(struct bsd_acct_struct *acct) |
cdd37e230 separate namespac... |
454 455 456 457 |
{ acct_t ac; unsigned long flim; const struct cred *orig_cred; |
b8f00e6be acct: new lifetim... |
458 |
struct file *file = acct->file; |
cdd37e230 separate namespac... |
459 460 461 462 463 464 465 466 467 468 469 470 471 |
/* * Accounting records are not subject to resource limits. */ flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; /* Perform file operations on behalf of whoever enabled accounting */ orig_cred = override_creds(file->f_cred); /* * First check to see if there is enough free_space to continue * the process accounting system. */ |
54a4d58a6 acct: simplify ch... |
472 |
if (!check_free_space(acct)) |
cdd37e230 separate namespac... |
473 474 475 |
goto out; fill_ac(&ac); |
1da177e4c Linux-2.6.12-rc2 |
476 |
/* we really need to bite the bullet and change layout */ |
f8f3d4de2 userns: Convert b... |
477 478 |
ac.ac_uid = from_kuid_munged(file->f_cred->user_ns, orig_cred->uid); ac.ac_gid = from_kgid_munged(file->f_cred->user_ns, orig_cred->gid); |
2577d92eb kernel/acct.c: fi... |
479 |
#if ACCT_VERSION == 1 || ACCT_VERSION == 2 |
1da177e4c Linux-2.6.12-rc2 |
480 |
/* backward-compatible 16 bit fields */ |
76aac0e9a CRED: Wrap task c... |
481 482 |
ac.ac_uid16 = ac.ac_uid; ac.ac_gid16 = ac.ac_gid; |
1da177e4c Linux-2.6.12-rc2 |
483 |
#endif |
2577d92eb kernel/acct.c: fi... |
484 |
#if ACCT_VERSION == 3 |
067b722fa acct: eliminate c... |
485 486 487 488 489 490 491 492 493 |
{ struct pid_namespace *ns = acct->ns; ac.ac_pid = task_tgid_nr_ns(current, ns); rcu_read_lock(); ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns); rcu_read_unlock(); } |
1da177e4c Linux-2.6.12-rc2 |
494 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
495 |
/* |
5ae98f158 fs: Fix hang with... |
496 497 498 |
* Get freeze protection. If the fs is frozen, just skip the write * as we could deadlock the system otherwise. */ |
ed44724b7 acct: switch to _... |
499 500 501 502 503 504 |
if (file_start_write_trylock(file)) { /* it's been opened O_APPEND, so position is irrelevant */ loff_t pos = 0; __kernel_write(file, (char *)&ac, sizeof(acct_t), &pos); file_end_write(file); } |
d8e180dcd bsdacct: switch c... |
505 |
out: |
ed44724b7 acct: switch to _... |
506 |
current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim; |
d8e180dcd bsdacct: switch c... |
507 |
revert_creds(orig_cred); |
1da177e4c Linux-2.6.12-rc2 |
508 |
} |
417ef5314 [PATCH] kernel/ac... |
509 |
/** |
0e4648141 [PATCH] pacct: ad... |
510 |
* acct_collect - collect accounting information into pacct_struct |
f6ec29a42 [PATCH] pacct: av... |
511 512 |
* @exitcode: task exit code * @group_dead: not 0, if this thread is the last one in the process. |
0e4648141 [PATCH] pacct: ad... |
513 |
*/ |
f6ec29a42 [PATCH] pacct: av... |
514 |
void acct_collect(long exitcode, int group_dead) |
0e4648141 [PATCH] pacct: ad... |
515 516 |
{ struct pacct_struct *pacct = ¤t->signal->pacct; |
6fac4829c cputime: Use acce... |
517 |
cputime_t utime, stime; |
0e4648141 [PATCH] pacct: ad... |
518 |
unsigned long vsize = 0; |
f6ec29a42 [PATCH] pacct: av... |
519 |
if (group_dead && current->mm) { |
0e4648141 [PATCH] pacct: ad... |
520 |
struct vm_area_struct *vma; |
2577d92eb kernel/acct.c: fi... |
521 |
|
0e4648141 [PATCH] pacct: ad... |
522 523 524 525 526 527 528 529 |
down_read(¤t->mm->mmap_sem); vma = current->mm->mmap; while (vma) { vsize += vma->vm_end - vma->vm_start; vma = vma->vm_next; } up_read(¤t->mm->mmap_sem); } |
77787bfb4 [PATCH] pacct: no... |
530 |
spin_lock_irq(¤t->sighand->siglock); |
f6ec29a42 [PATCH] pacct: av... |
531 532 533 534 535 536 537 538 539 540 541 542 543 |
if (group_dead) pacct->ac_mem = vsize / 1024; if (thread_group_leader(current)) { pacct->ac_exitcode = exitcode; if (current->flags & PF_FORKNOEXEC) pacct->ac_flag |= AFORK; } if (current->flags & PF_SUPERPRIV) pacct->ac_flag |= ASU; if (current->flags & PF_DUMPCORE) pacct->ac_flag |= ACORE; if (current->flags & PF_SIGNALED) pacct->ac_flag |= AXSIG; |
6fac4829c cputime: Use acce... |
544 545 546 |
task_cputime(current, &utime, &stime); pacct->ac_utime += utime; pacct->ac_stime += stime; |
77787bfb4 [PATCH] pacct: no... |
547 548 549 |
pacct->ac_minflt += current->min_flt; pacct->ac_majflt += current->maj_flt; spin_unlock_irq(¤t->sighand->siglock); |
0e4648141 [PATCH] pacct: ad... |
550 |
} |
e25ff11ff split the slow pa... |
551 |
static void slow_acct_process(struct pid_namespace *ns) |
1da177e4c Linux-2.6.12-rc2 |
552 |
{ |
e25ff11ff split the slow pa... |
553 |
for ( ; ns; ns = ns->parent) { |
215752fce acct: get rid of ... |
554 |
struct bsd_acct_struct *acct = acct_get(ns); |
b8f00e6be acct: new lifetim... |
555 556 557 |
if (acct) { do_acct_process(acct); mutex_unlock(&acct->lock); |
9e251d020 kill pin_put() |
558 |
acct_put(acct); |
e25ff11ff split the slow pa... |
559 |
} |
e25ff11ff split the slow pa... |
560 |
} |
1da177e4c Linux-2.6.12-rc2 |
561 |
} |
7d1e13505 bsdacct: account ... |
562 563 |
/** |
e25ff11ff split the slow pa... |
564 |
* acct_process |
7d1e13505 bsdacct: account ... |
565 566 567 568 569 570 |
* * handles process accounting for an exiting task */ void acct_process(void) { struct pid_namespace *ns; |
0c18d7a5d bsdacct: fix and ... |
571 572 573 574 575 |
/* * This loop is safe lockless, since current is still * alive and holds its namespace, which in turn holds * its parent. */ |
e25ff11ff split the slow pa... |
576 |
for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent) { |
b8f00e6be acct: new lifetim... |
577 |
if (ns->bacct) |
e25ff11ff split the slow pa... |
578 579 580 581 |
break; } if (unlikely(ns)) slow_acct_process(ns); |
7d1e13505 bsdacct: account ... |
582 |
} |