| 1 | |
| 2 | * linux/kernel/acct.c
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| 3 | *
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| 4 | * BSD Process Accounting for Linux
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| 5 | *
|
| 6 | * Author: Marco van Wieringen <[email protected]>
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| 7 | *
|
| 8 | * Some code based on ideas and code from:
|
| 9 | * Thomas K. Dyas <[email protected]>
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| 10 | *
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| 11 | * This file implements BSD-style process accounting. Whenever any
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| 12 | * process exits, an accounting record of type "struct acct" is
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| 13 | * written to the file specified with the acct() system call. It is
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| 14 | * up to user-level programs to do useful things with the accounting
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| 15 | * log. The kernel just provides the raw accounting information.
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| 16 | *
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| 17 | * (C) Copyright 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
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| 18 | *
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| 19 | * Plugged two leaks. 1) It didn't return acct_file into the free_filps if
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| 20 | * the file happened to be read-only. 2) If the accounting was suspended
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| 21 | * due to the lack of space it happily allowed to reopen it and completely
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| 22 | * lost the old acct_file. 3/10/98, Al Viro.
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| 23 | *
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| 24 | * Now we silently close acct_file on attempt to reopen. Cleaned sys_acct().
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| 25 | * XTerms and EMACS are manifestations of pure evil. 21/10/98, AV.
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| 26 | *
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| 27 | * Fixed a nasty interaction with with sys_umount(). If the accointing
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| 28 | * was suspeneded we failed to stop it on umount(). Messy.
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| 29 | * Another one: remount to readonly didn't stop accounting.
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| 30 | * Question: what should we do if we have CAP_SYS_ADMIN but not
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| 31 | * CAP_SYS_PACCT? Current code does the following: umount returns -EBUSY
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| 32 | * unless we are messing with the root. In that case we are getting a
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| 33 | * real mess with do_remount_sb(). 9/11/98, AV.
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| 34 | *
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| 35 | * Fixed a bunch of races (and pair of leaks). Probably not the best way,
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| 36 | * but this one obviously doesn't introduce deadlocks. Later. BTW, found
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| 37 | * one race (and leak) in BSD implementation.
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| 38 | * OK, that's better. ANOTHER race and leak in BSD variant. There always
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| 39 | * is one more bug... 10/11/98, AV.
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| 40 | *
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| 41 | * Oh, fsck... Oopsable SMP race in do_process_acct() - we must hold
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| 42 | * ->mmap_sem to walk the vma list of current->mm. Nasty, since it leaks
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| 43 | * a struct file opened for write. Fixed. 2/6/2000, AV.
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| 44 |
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| 45 |
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| 46 | #include <linux/config.h>
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| 47 | #include <linux/mm.h>
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| 48 | #include <linux/slab.h>
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| 49 | #include <linux/acct.h>
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| 50 | #include <linux/file.h>
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| 51 | #include <linux/tty.h>
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| 52 | #include <linux/security.h>
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| 53 | #include <linux/vfs.h>
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| 54 | #include <linux/jiffies.h>
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| 55 | #include <linux/times.h>
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| 56 | #include <linux/syscalls.h>
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| 57 | #include <asm/uaccess.h>
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| 58 | #include <asm/div64.h>
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| 59 | #include <linux/blkdev.h>
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| 60 |
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| 61 | |
| 62 | * These constants control the amount of freespace that suspend and
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| 63 | * resume the process accounting system, and the time delay between
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| 64 | * each check.
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| 65 | * Turned into sysctl-controllable parameters. AV, 12/11/98
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| 66 |
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| 67 |
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| 68 | int acct_parm[3] = {4, 2, 30};
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| 69 | #define RESUME (acct_parm[0])
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| 70 | #define SUSPEND (acct_parm[1])
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| 71 | #define ACCT_TIMEOUT (acct_parm[2])
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| 72 |
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| 73 | |
| 74 | * External references and all of the globals.
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| 75 |
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| 76 | static void do_acct_process(long, struct file *);
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| 77 |
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| 78 | |
| 79 | * This structure is used so that all the data protected by lock
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| 80 | * can be placed in the same cache line as the lock. This primes
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| 81 | * the cache line to have the data after getting the lock.
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| 82 |
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| 83 | struct acct_glbs {
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| 84 | spinlock_t lock;
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| 85 | volatile int active;
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| 86 | volatile int needcheck;
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| 87 | struct file *file;
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| 88 | struct timer_list timer;
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| 89 | };
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| 90 |
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| 91 | static struct acct_glbs acct_globals __cacheline_aligned = {SPIN_LOCK_UNLOCKED};
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| 92 |
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| 93 | |
| 94 | * Called whenever the timer says to check the free space.
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| 95 |
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| 96 | static void acct_timeout(unsigned long unused)
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| 97 | {
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| 98 | acct_globals.needcheck = 1;
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| 99 | }
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| 100 |
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| 101 | |
| 102 | * Check the amount of free space and suspend/resume accordingly.
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| 103 |
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| 104 | static int check_free_space(struct file *file)
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| 105 | {
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| 106 | struct kstatfs sbuf;
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| 107 | int res;
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| 108 | int act;
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| 109 | sector_t resume;
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| 110 | sector_t suspend;
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| 111 |
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| 112 | spin_lock(&acct_globals.lock);
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| 113 | res = acct_globals.active;
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| 114 | if (!file || !acct_globals.needcheck)
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| 115 | goto out;
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| 116 | spin_unlock(&acct_globals.lock);
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| 117 |
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| 118 |
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| 119 | if (vfs_statfs(file->f_dentry->d_inode->i_sb, &sbuf))
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| 120 | return res;
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| 121 | suspend = sbuf.f_blocks * SUSPEND;
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| 122 | resume = sbuf.f_blocks * RESUME;
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| 123 |
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| 124 | sector_div(suspend, 100);
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| 125 | sector_div(resume, 100);
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| 126 |
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| 127 | if (sbuf.f_bavail <= suspend)
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| 128 | act = -1;
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| 129 | else if (sbuf.f_bavail >= resume)
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| 130 | act = 1;
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| 131 | else
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| 132 | act = 0;
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| 133 |
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| 134 | |
| 135 | * If some joker switched acct_globals.file under us we'ld better be
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| 136 | * silent and _not_ touch anything.
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| 137 |
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| 138 | spin_lock(&acct_globals.lock);
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| 139 | if (file != acct_globals.file) {
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| 140 | if (act)
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| 141 | res = act>0;
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| 142 | goto out;
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| 143 | }
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| 144 |
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| 145 | if (acct_globals.active) {
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| 146 | if (act < 0) {
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| 147 | acct_globals.active = 0;
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| 148 | printk(KERN_INFO "Process accounting paused\n");
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| 149 | }
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| 150 | } else {
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| 151 | if (act > 0) {
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| 152 | acct_globals.active = 1;
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| 153 | printk(KERN_INFO "Process accounting resumed\n");
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| 154 | }
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| 155 | }
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| 156 |
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| 157 | del_timer(&acct_globals.timer);
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| 158 | acct_globals.needcheck = 0;
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| 159 | acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ;
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| 160 | add_timer(&acct_globals.timer);
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| 161 | res = acct_globals.active;
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| 162 | out:
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| 163 | spin_unlock(&acct_globals.lock);
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| 164 | return res;
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| 165 | }
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| 166 |
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| 167 | |
| 168 | * Close the old accouting file (if currently open) and then replace
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| 169 | * it with file (if non-NULL).
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| 170 | *
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| 171 | * NOTE: acct_globals.lock MUST be held on entry and exit.
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| 172 |
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| 173 | static void acct_file_reopen(struct file *file)
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| 174 | {
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| 175 | struct file *old_acct = NULL;
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| 176 |
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| 177 | if (acct_globals.file) {
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| 178 | old_acct = acct_globals.file;
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| 179 | del_timer(&acct_globals.timer);
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| 180 | acct_globals.active = 0;
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| 181 | acct_globals.needcheck = 0;
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| 182 | acct_globals.file = NULL;
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| 183 | }
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| 184 | if (file) {
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| 185 | acct_globals.file = file;
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| 186 | acct_globals.needcheck = 0;
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| 187 | acct_globals.active = 1;
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| 188 |
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| 189 | init_timer(&acct_globals.timer);
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| 190 | acct_globals.timer.function = acct_timeout;
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| 191 | acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ;
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| 192 | add_timer(&acct_globals.timer);
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| 193 | }
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| 194 | if (old_acct) {
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| 195 | spin_unlock(&acct_globals.lock);
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| 196 | do_acct_process(0, old_acct);
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| 197 | filp_close(old_acct, NULL);
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| 198 | spin_lock(&acct_globals.lock);
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| 199 | }
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| 200 | }
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| 201 |
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| 202 | |
| 203 | * sys_acct() is the only system call needed to implement process
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| 204 | * accounting. It takes the name of the file where accounting records
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| 205 | * should be written. If the filename is NULL, accounting will be
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| 206 | * shutdown.
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| 207 |
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| 208 | asmlinkage long sys_acct(const char __user *name)
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| 209 | {
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| 210 | struct file *file = NULL;
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| 211 | char *tmp;
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| 212 | int error;
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| 213 |
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| 214 | if (!capable(CAP_SYS_PACCT))
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| 215 | return -EPERM;
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| 216 |
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| 217 | if (name) {
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| 218 | tmp = getname(name);
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| 219 | if (IS_ERR(tmp)) {
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| 220 | return (PTR_ERR(tmp));
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| 221 | }
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| 222 |
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| 223 | file = filp_open(tmp, O_WRONLY|O_APPEND, 0);
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| 224 | putname(tmp);
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| 225 | if (IS_ERR(file)) {
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| 226 | return (PTR_ERR(file));
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| 227 | }
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| 228 | if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
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| 229 | filp_close(file, NULL);
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| 230 | return (-EACCES);
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| 231 | }
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| 232 |
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| 233 | if (!file->f_op->write) {
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| 234 | filp_close(file, NULL);
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| 235 | return (-EIO);
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| 236 | }
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| 237 | }
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| 238 |
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| 239 | error = security_acct(file);
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| 240 | if (error) {
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| 241 | if (file)
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| 242 | filp_close(file, NULL);
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| 243 | return error;
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| 244 | }
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| 245 |
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| 246 | spin_lock(&acct_globals.lock);
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| 247 | acct_file_reopen(file);
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| 248 | spin_unlock(&acct_globals.lock);
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| 249 |
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| 250 | return (0);
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| 251 | }
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| 252 |
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| 253 | |
| 254 | * If the accouting is turned on for a file in the filesystem pointed
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| 255 | * to by sb, turn accouting off.
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| 256 |
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| 257 | void acct_auto_close(struct super_block *sb)
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| 258 | {
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| 259 | spin_lock(&acct_globals.lock);
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| 260 | if (acct_globals.file &&
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| 261 | acct_globals.file->f_dentry->d_inode->i_sb == sb) {
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| 262 | acct_file_reopen((struct file *)NULL);
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| 263 | }
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| 264 | spin_unlock(&acct_globals.lock);
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| 265 | }
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| 266 |
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| 267 | |
| 268 | * encode an unsigned long into a comp_t
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| 269 | *
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| 270 | * This routine has been adopted from the encode_comp_t() function in
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| 271 | * the kern_acct.c file of the FreeBSD operating system. The encoding
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| 272 | * is a 13-bit fraction with a 3-bit (base 8) exponent.
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| 273 |
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| 274 |
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| 275 | #define MANTSIZE 13
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| 276 | #define EXPSIZE 3
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| 277 | #define MAXFRACT ((1 << MANTSIZE) - 1)
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| 278 |
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| 279 | static comp_t encode_comp_t(unsigned long value)
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| 280 | {
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| 281 | int exp, rnd;
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| 282 |
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| 283 | exp = rnd = 0;
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| 284 | while (value > MAXFRACT) {
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| 285 | rnd = value & (1 << (EXPSIZE - 1));
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| 286 | value >>= EXPSIZE;
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| 287 | exp++;
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| 288 | }
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| 289 |
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| 290 | |
| 291 | * If we need to round up, do it (and handle overflow correctly).
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| 292 |
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| 293 | if (rnd && (++value > MAXFRACT)) {
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| 294 | value >>= EXPSIZE;
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| 295 | exp++;
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| 296 | }
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| 297 |
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| 298 | |
| 299 | * Clean it up and polish it off.
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| 300 |
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| 301 | exp <<= MANTSIZE;
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| 302 | exp += value;
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| 303 | return exp;
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| 304 | }
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| 305 |
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| 306 | #if ACCT_VERSION==1 || ACCT_VERSION==2
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| 307 | |
| 308 | * encode an u64 into a comp2_t (24 bits)
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| 309 | *
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| 310 | * Format: 5 bit base 2 exponent, 20 bits mantissa.
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| 311 | * The leading bit of the mantissa is not stored, but implied for
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| 312 | * non-zero exponents.
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| 313 | * Largest encodable value is 50 bits.
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| 314 |
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| 315 |
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| 316 | #define MANTSIZE2 20
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| 317 | #define EXPSIZE2 5
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| 318 | #define MAXFRACT2 ((1ul << MANTSIZE2) - 1)
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| 319 | #define MAXEXP2 ((1 <<EXPSIZE2) - 1)
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| 320 |
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| 321 | static comp2_t encode_comp2_t(u64 value)
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| 322 | {
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| 323 | int exp, rnd;
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| 324 |
|
| 325 | exp = (value > (MAXFRACT2>>1));
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| 326 | rnd = 0;
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| 327 | while (value > MAXFRACT2) {
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| 328 | rnd = value & 1;
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| 329 | value >>= 1;
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| 330 | exp++;
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| 331 | }
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| 332 |
|
| 333 | |
| 334 | * If we need to round up, do it (and handle overflow correctly).
|
| 335 |
|
| 336 | if (rnd && (++value > MAXFRACT2)) {
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| 337 | value >>= 1;
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| 338 | exp++;
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| 339 | }
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| 340 |
|
| 341 | if (exp > MAXEXP2) {
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| 342 |
|
| 343 | return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1;
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| 344 | } else {
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| 345 | return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1));
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| 346 | }
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| 347 | }
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| 348 | #endif
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| 349 |
|
| 350 | #if ACCT_VERSION==3
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| 351 | |
| 352 | * encode an u64 into a 32 bit IEEE float
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| 353 |
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| 354 | static u32 encode_float(u64 value)
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| 355 | {
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| 356 | unsigned exp = 190;
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| 357 | unsigned u;
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| 358 |
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| 359 | if (value==0) return 0;
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| 360 | while ((s64)value > 0){
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| 361 | value <<= 1;
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| 362 | exp--;
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| 363 | }
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| 364 | u = (u32)(value >> 40) & 0x7fffffu;
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| 365 | return u | (exp << 23);
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| 366 | }
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| 367 | #endif
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| 368 |
|
| 369 | |
| 370 | * Write an accounting entry for an exiting process
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| 371 | *
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| 372 | * The acct_process() call is the workhorse of the process
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| 373 | * accounting system. The struct acct is built here and then written
|
| 374 | * into the accounting file. This function should only be called from
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| 375 | * do_exit().
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| 376 |
|
| 377 |
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| 378 | |
| 379 | * do_acct_process does all actual work. Caller holds the reference to file.
|
| 380 |
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| 381 | static void do_acct_process(long exitcode, struct file *file)
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| 382 | {
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| 383 | acct_t ac;
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| 384 | mm_segment_t fs;
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| 385 | unsigned long vsize;
|
| 386 | unsigned long flim;
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| 387 | u64 elapsed;
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| 388 | u64 run_time;
|
| 389 | struct timespec uptime;
|
| 390 |
|
| 391 | |
| 392 | * First check to see if there is enough free_space to continue
|
| 393 | * the process accounting system.
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| 394 |
|
| 395 | if (!check_free_space(file))
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| 396 | return;
|
| 397 |
|
| 398 | |
| 399 | * Fill the accounting struct with the needed info as recorded
|
| 400 | * by the different kernel functions.
|
| 401 |
|
| 402 | memset((caddr_t)&ac, 0, sizeof(acct_t));
|
| 403 |
|
| 404 | ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER;
|
| 405 | strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm));
|
| 406 |
|
| 407 |
|
| 408 | do_posix_clock_monotonic_gettime(&uptime);
|
| 409 | run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec;
|
| 410 | run_time -= (u64)current->start_time.tv_sec*NSEC_PER_SEC
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| 411 | + current->start_time.tv_nsec;
|
| 412 |
|
| 413 | elapsed = nsec_to_AHZ(run_time);
|
| 414 | #if ACCT_VERSION==3
|
| 415 | ac.ac_etime = encode_float(elapsed);
|
| 416 | #else
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| 417 | ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ?
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| 418 | (unsigned long) elapsed : (unsigned long) -1l);
|
| 419 | #endif
|
| 420 | #if ACCT_VERSION==1 || ACCT_VERSION==2
|
| 421 | {
|
| 422 |
|
| 423 | comp2_t etime = encode_comp2_t(elapsed);
|
| 424 | ac.ac_etime_hi = etime >> 16;
|
| 425 | ac.ac_etime_lo = (u16) etime;
|
| 426 | }
|
| 427 | #endif
|
| 428 | do_div(elapsed, AHZ);
|
| 429 | ac.ac_btime = xtime.tv_sec - elapsed;
|
| 430 | ac.ac_utime = encode_comp_t(jiffies_to_AHZ(
|
| 431 | current->signal->utime +
|
| 432 | current->group_leader->utime));
|
| 433 | ac.ac_stime = encode_comp_t(jiffies_to_AHZ(
|
| 434 | current->signal->stime +
|
| 435 | current->group_leader->stime));
|
| 436 |
|
| 437 | ac.ac_uid = current->uid;
|
| 438 | ac.ac_gid = current->gid;
|
| 439 | #if ACCT_VERSION==2
|
| 440 | ac.ac_ahz = AHZ;
|
| 441 | #endif
|
| 442 | #if ACCT_VERSION==1 || ACCT_VERSION==2
|
| 443 |
|
| 444 | ac.ac_uid16 = current->uid;
|
| 445 | ac.ac_gid16 = current->gid;
|
| 446 | #endif
|
| 447 | #if ACCT_VERSION==3
|
| 448 | ac.ac_pid = current->tgid;
|
| 449 | ac.ac_ppid = current->parent->tgid;
|
| 450 | #endif
|
| 451 |
|
| 452 | read_lock(&tasklist_lock);
|
| 453 | ac.ac_tty = current->signal->tty ?
|
| 454 | old_encode_dev(tty_devnum(current->signal->tty)) : 0;
|
| 455 | read_unlock(&tasklist_lock);
|
| 456 |
|
| 457 | ac.ac_flag = 0;
|
| 458 | if (current->flags & PF_FORKNOEXEC)
|
| 459 | ac.ac_flag |= AFORK;
|
| 460 | if (current->flags & PF_SUPERPRIV)
|
| 461 | ac.ac_flag |= ASU;
|
| 462 | if (current->flags & PF_DUMPCORE)
|
| 463 | ac.ac_flag |= ACORE;
|
| 464 | if (current->flags & PF_SIGNALED)
|
| 465 | ac.ac_flag |= AXSIG;
|
| 466 |
|
| 467 | vsize = 0;
|
| 468 | if (current->mm) {
|
| 469 | struct vm_area_struct *vma;
|
| 470 | down_read(¤t->mm->mmap_sem);
|
| 471 | vma = current->mm->mmap;
|
| 472 | while (vma) {
|
| 473 | vsize += vma->vm_end - vma->vm_start;
|
| 474 | vma = vma->vm_next;
|
| 475 | }
|
| 476 | up_read(¤t->mm->mmap_sem);
|
| 477 | }
|
| 478 | vsize = vsize / 1024;
|
| 479 | ac.ac_mem = encode_comp_t(vsize);
|
| 480 | ac.ac_io = encode_comp_t(0 );
|
| 481 | ac.ac_rw = encode_comp_t(ac.ac_io / 1024);
|
| 482 | ac.ac_minflt = encode_comp_t(current->signal->min_flt +
|
| 483 | current->group_leader->min_flt);
|
| 484 | ac.ac_majflt = encode_comp_t(current->signal->maj_flt +
|
| 485 | current->group_leader->maj_flt);
|
| 486 | ac.ac_swaps = encode_comp_t(0);
|
| 487 | ac.ac_exitcode = exitcode;
|
| 488 |
|
| 489 | |
| 490 | * Kernel segment override to datasegment and write it
|
| 491 | * to the accounting file.
|
| 492 |
|
| 493 | fs = get_fs();
|
| 494 | set_fs(KERNEL_DS);
|
| 495 | |
| 496 | * Accounting records are not subject to resource limits.
|
| 497 |
|
| 498 | flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
|
| 499 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
|
| 500 | file->f_op->write(file, (char *)&ac,
|
| 501 | sizeof(acct_t), &file->f_pos);
|
| 502 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim;
|
| 503 | set_fs(fs);
|
| 504 | }
|
| 505 |
|
| 506 | |
| 507 | * acct_process - now just a wrapper around do_acct_process
|
| 508 |
|
| 509 | void acct_process(long exitcode)
|
| 510 | {
|
| 511 | struct file *file = NULL;
|
| 512 |
|
| 513 | |
| 514 | * accelerate the common fastpath:
|
| 515 |
|
| 516 | if (!acct_globals.file)
|
| 517 | return;
|
| 518 |
|
| 519 | spin_lock(&acct_globals.lock);
|
| 520 | file = acct_globals.file;
|
| 521 | if (unlikely(!file)) {
|
| 522 | spin_unlock(&acct_globals.lock);
|
| 523 | return;
|
| 524 | }
|
| 525 | get_file(file);
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| 526 | spin_unlock(&acct_globals.lock);
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| 527 |
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| 528 | do_acct_process(exitcode, file);
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| 529 | fput(file);
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| 530 | }
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| 531 |
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| 532 |
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| 533 | |
| 534 | * acct_update_integrals
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| 535 | * - update mm integral fields in task_struct
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| 536 |
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| 537 | void acct_update_integrals(struct task_struct *tsk)
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| 538 | {
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| 539 | if (likely(tsk->mm)) {
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| 540 | long delta = tsk->stime - tsk->acct_stimexpd;
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| 541 |
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| 542 | if (delta == 0)
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| 543 | return;
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| 544 | tsk->acct_stimexpd = tsk->stime;
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| 545 | tsk->acct_rss_mem1 += delta * get_mm_counter(tsk->mm, rss);
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| 546 | tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
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| 547 | }
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| 548 | }
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| 549 |
|
| 550 | |
| 551 | * acct_clear_integrals
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| 552 | * - clear the mm integral fields in task_struct
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| 553 |
|
| 554 | void acct_clear_integrals(struct task_struct *tsk)
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| 555 | {
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| 556 | if (tsk) {
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| 557 | tsk->acct_stimexpd = 0;
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| 558 | tsk->acct_rss_mem1 = 0;
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| 559 | tsk->acct_vm_mem1 = 0;
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| 560 | }
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| 561 | }
|