Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/acct.c |
| 3 | * |
| 4 | * BSD Process Accounting for Linux |
| 5 | * |
| 6 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
| 7 | * |
| 8 | * Some code based on ideas and code from: |
| 9 | * Thomas K. Dyas <tdyas@eden.rutgers.edu> |
| 10 | * |
| 11 | * This file implements BSD-style process accounting. Whenever any |
| 12 | * process exits, an accounting record of type "struct acct" is |
| 13 | * written to the file specified with the acct() system call. It is |
| 14 | * up to user-level programs to do useful things with the accounting |
| 15 | * log. The kernel just provides the raw accounting information. |
| 16 | * |
| 17 | * (C) Copyright 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V. |
| 18 | * |
| 19 | * Plugged two leaks. 1) It didn't return acct_file into the free_filps if |
| 20 | * the file happened to be read-only. 2) If the accounting was suspended |
| 21 | * due to the lack of space it happily allowed to reopen it and completely |
| 22 | * lost the old acct_file. 3/10/98, Al Viro. |
| 23 | * |
| 24 | * Now we silently close acct_file on attempt to reopen. Cleaned sys_acct(). |
| 25 | * XTerms and EMACS are manifestations of pure evil. 21/10/98, AV. |
| 26 | * |
| 27 | * Fixed a nasty interaction with with sys_umount(). If the accointing |
| 28 | * was suspeneded we failed to stop it on umount(). Messy. |
| 29 | * Another one: remount to readonly didn't stop accounting. |
| 30 | * Question: what should we do if we have CAP_SYS_ADMIN but not |
| 31 | * CAP_SYS_PACCT? Current code does the following: umount returns -EBUSY |
| 32 | * unless we are messing with the root. In that case we are getting a |
| 33 | * real mess with do_remount_sb(). 9/11/98, AV. |
| 34 | * |
| 35 | * Fixed a bunch of races (and pair of leaks). Probably not the best way, |
| 36 | * but this one obviously doesn't introduce deadlocks. Later. BTW, found |
| 37 | * one race (and leak) in BSD implementation. |
| 38 | * OK, that's better. ANOTHER race and leak in BSD variant. There always |
| 39 | * is one more bug... 10/11/98, AV. |
| 40 | * |
| 41 | * Oh, fsck... Oopsable SMP race in do_process_acct() - we must hold |
| 42 | * ->mmap_sem to walk the vma list of current->mm. Nasty, since it leaks |
| 43 | * a struct file opened for write. Fixed. 2/6/2000, AV. |
| 44 | */ |
| 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/mm.h> |
| 47 | #include <linux/slab.h> |
| 48 | #include <linux/acct.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 49 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/file.h> |
| 51 | #include <linux/tty.h> |
| 52 | #include <linux/security.h> |
| 53 | #include <linux/vfs.h> |
| 54 | #include <linux/jiffies.h> |
| 55 | #include <linux/times.h> |
| 56 | #include <linux/syscalls.h> |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 57 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <asm/uaccess.h> |
| 59 | #include <asm/div64.h> |
| 60 | #include <linux/blkdev.h> /* sector_div */ |
Pavel Emelyanov | 5f7b703 | 2008-03-24 12:29:53 -0700 | [diff] [blame] | 61 | #include <linux/pid_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | /* |
| 64 | * These constants control the amount of freespace that suspend and |
| 65 | * resume the process accounting system, and the time delay between |
| 66 | * each check. |
| 67 | * Turned into sysctl-controllable parameters. AV, 12/11/98 |
| 68 | */ |
| 69 | |
| 70 | int acct_parm[3] = {4, 2, 30}; |
| 71 | #define RESUME (acct_parm[0]) /* >foo% free space - resume */ |
| 72 | #define SUSPEND (acct_parm[1]) /* <foo% free space - suspend */ |
| 73 | #define ACCT_TIMEOUT (acct_parm[2]) /* foo second timeout between checks */ |
| 74 | |
| 75 | /* |
| 76 | * External references and all of the globals. |
| 77 | */ |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 78 | static void do_acct_process(struct bsd_acct_struct *acct, |
| 79 | struct pid_namespace *ns, struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | /* |
| 82 | * This structure is used so that all the data protected by lock |
| 83 | * can be placed in the same cache line as the lock. This primes |
| 84 | * the cache line to have the data after getting the lock. |
| 85 | */ |
Pavel Emelyanov | 081e4c8 | 2008-07-25 01:48:42 -0700 | [diff] [blame] | 86 | struct bsd_acct_struct { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | volatile int active; |
| 88 | volatile int needcheck; |
| 89 | struct file *file; |
Pavel Emelyanov | 5f7b703 | 2008-03-24 12:29:53 -0700 | [diff] [blame] | 90 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | struct timer_list timer; |
Pavel Emelyanov | b5a7174 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 92 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | }; |
| 94 | |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 95 | static DEFINE_SPINLOCK(acct_lock); |
Pavel Emelyanov | b5a7174 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 96 | static LIST_HEAD(acct_list); |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | /* |
| 99 | * Called whenever the timer says to check the free space. |
| 100 | */ |
Pavel Emelyanov | e59a04a | 2008-07-25 01:48:44 -0700 | [diff] [blame] | 101 | static void acct_timeout(unsigned long x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Pavel Emelyanov | e59a04a | 2008-07-25 01:48:44 -0700 | [diff] [blame] | 103 | struct bsd_acct_struct *acct = (struct bsd_acct_struct *)x; |
| 104 | acct->needcheck = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | /* |
| 108 | * Check the amount of free space and suspend/resume accordingly. |
| 109 | */ |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 110 | static int check_free_space(struct bsd_acct_struct *acct, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
| 112 | struct kstatfs sbuf; |
| 113 | int res; |
| 114 | int act; |
| 115 | sector_t resume; |
| 116 | sector_t suspend; |
| 117 | |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 118 | spin_lock(&acct_lock); |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 119 | res = acct->active; |
| 120 | if (!file || !acct->needcheck) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | goto out; |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 122 | spin_unlock(&acct_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | /* May block */ |
Christoph Hellwig | ebabe9a | 2010-07-07 18:53:11 +0200 | [diff] [blame] | 125 | if (vfs_statfs(&file->f_path, &sbuf)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | return res; |
| 127 | suspend = sbuf.f_blocks * SUSPEND; |
| 128 | resume = sbuf.f_blocks * RESUME; |
| 129 | |
| 130 | sector_div(suspend, 100); |
| 131 | sector_div(resume, 100); |
| 132 | |
| 133 | if (sbuf.f_bavail <= suspend) |
| 134 | act = -1; |
| 135 | else if (sbuf.f_bavail >= resume) |
| 136 | act = 1; |
| 137 | else |
| 138 | act = 0; |
| 139 | |
| 140 | /* |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 141 | * If some joker switched acct->file under us we'ld better be |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | * silent and _not_ touch anything. |
| 143 | */ |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 144 | spin_lock(&acct_lock); |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 145 | if (file != acct->file) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | if (act) |
| 147 | res = act>0; |
| 148 | goto out; |
| 149 | } |
| 150 | |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 151 | if (acct->active) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | if (act < 0) { |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 153 | acct->active = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | printk(KERN_INFO "Process accounting paused\n"); |
| 155 | } |
| 156 | } else { |
| 157 | if (act > 0) { |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 158 | acct->active = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | printk(KERN_INFO "Process accounting resumed\n"); |
| 160 | } |
| 161 | } |
| 162 | |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 163 | del_timer(&acct->timer); |
| 164 | acct->needcheck = 0; |
| 165 | acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ; |
| 166 | add_timer(&acct->timer); |
| 167 | res = acct->active; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | out: |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 169 | spin_unlock(&acct_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | return res; |
| 171 | } |
| 172 | |
| 173 | /* |
Randy Dunlap | 417ef53 | 2005-09-10 00:26:39 -0700 | [diff] [blame] | 174 | * Close the old accounting file (if currently open) and then replace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | * it with file (if non-NULL). |
| 176 | * |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 177 | * NOTE: acct_lock MUST be held on entry and exit. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | */ |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 179 | static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file, |
| 180 | struct pid_namespace *ns) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | { |
| 182 | struct file *old_acct = NULL; |
Pavel Emelyanov | 5f7b703 | 2008-03-24 12:29:53 -0700 | [diff] [blame] | 183 | struct pid_namespace *old_ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 185 | if (acct->file) { |
| 186 | old_acct = acct->file; |
| 187 | old_ns = acct->ns; |
| 188 | del_timer(&acct->timer); |
| 189 | acct->active = 0; |
| 190 | acct->needcheck = 0; |
| 191 | acct->file = NULL; |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 192 | acct->ns = NULL; |
Pavel Emelyanov | b5a7174 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 193 | list_del(&acct->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | if (file) { |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 196 | acct->file = file; |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 197 | acct->ns = ns; |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 198 | acct->needcheck = 0; |
| 199 | acct->active = 1; |
Pavel Emelyanov | b5a7174 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 200 | list_add(&acct->list, &acct_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | /* It's been deleted if it was used before so this is safe */ |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 202 | setup_timer(&acct->timer, acct_timeout, (unsigned long)acct); |
| 203 | acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ; |
| 204 | add_timer(&acct->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
| 206 | if (old_acct) { |
Josef "Jeff" Sipek | f3a43f3 | 2006-12-08 02:36:43 -0800 | [diff] [blame] | 207 | mnt_unpin(old_acct->f_path.mnt); |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 208 | spin_unlock(&acct_lock); |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 209 | do_acct_process(acct, old_ns, old_acct); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | filp_close(old_acct, NULL); |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 211 | spin_lock(&acct_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | } |
| 214 | |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 215 | static int acct_on(char *name) |
| 216 | { |
| 217 | struct file *file; |
Renaud Lottiaux | df279ca | 2009-06-30 11:41:34 -0700 | [diff] [blame] | 218 | struct vfsmount *mnt; |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 219 | struct pid_namespace *ns; |
| 220 | struct bsd_acct_struct *acct = NULL; |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 221 | |
| 222 | /* Difference from BSD - they don't do O_APPEND */ |
| 223 | file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0); |
| 224 | if (IS_ERR(file)) |
| 225 | return PTR_ERR(file); |
| 226 | |
Josef "Jeff" Sipek | f3a43f3 | 2006-12-08 02:36:43 -0800 | [diff] [blame] | 227 | if (!S_ISREG(file->f_path.dentry->d_inode->i_mode)) { |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 228 | filp_close(file, NULL); |
| 229 | return -EACCES; |
| 230 | } |
| 231 | |
| 232 | if (!file->f_op->write) { |
| 233 | filp_close(file, NULL); |
| 234 | return -EIO; |
| 235 | } |
| 236 | |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 237 | ns = task_active_pid_ns(current); |
| 238 | if (ns->bacct == NULL) { |
| 239 | acct = kzalloc(sizeof(struct bsd_acct_struct), GFP_KERNEL); |
| 240 | if (acct == NULL) { |
| 241 | filp_close(file, NULL); |
| 242 | return -ENOMEM; |
| 243 | } |
| 244 | } |
| 245 | |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 246 | spin_lock(&acct_lock); |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 247 | if (ns->bacct == NULL) { |
| 248 | ns->bacct = acct; |
| 249 | acct = NULL; |
| 250 | } |
| 251 | |
Renaud Lottiaux | df279ca | 2009-06-30 11:41:34 -0700 | [diff] [blame] | 252 | mnt = file->f_path.mnt; |
| 253 | mnt_pin(mnt); |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 254 | acct_file_reopen(ns->bacct, file, ns); |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 255 | spin_unlock(&acct_lock); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 256 | |
Renaud Lottiaux | df279ca | 2009-06-30 11:41:34 -0700 | [diff] [blame] | 257 | mntput(mnt); /* it's pinned, now give up active reference */ |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 258 | kfree(acct); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
Randy Dunlap | 417ef53 | 2005-09-10 00:26:39 -0700 | [diff] [blame] | 263 | /** |
| 264 | * sys_acct - enable/disable process accounting |
| 265 | * @name: file name for accounting records or NULL to shutdown accounting |
| 266 | * |
| 267 | * Returns 0 for success or negative errno values for failure. |
| 268 | * |
| 269 | * sys_acct() is the only system call needed to implement process |
| 270 | * accounting. It takes the name of the file where accounting records |
| 271 | * should be written. If the filename is NULL, accounting will be |
| 272 | * shutdown. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | */ |
Heiko Carstens | b290ebe | 2009-01-14 14:14:06 +0100 | [diff] [blame] | 274 | SYSCALL_DEFINE1(acct, const char __user *, name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
Eric Paris | 05b9049 | 2010-04-07 15:15:25 -0400 | [diff] [blame] | 276 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
| 278 | if (!capable(CAP_SYS_PACCT)) |
| 279 | return -EPERM; |
| 280 | |
| 281 | if (name) { |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 282 | char *tmp = getname(name); |
| 283 | if (IS_ERR(tmp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | return (PTR_ERR(tmp)); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 285 | error = acct_on(tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | putname(tmp); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 287 | } else { |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 288 | struct bsd_acct_struct *acct; |
| 289 | |
| 290 | acct = task_active_pid_ns(current)->bacct; |
| 291 | if (acct == NULL) |
| 292 | return 0; |
| 293 | |
Eric Paris | 05b9049 | 2010-04-07 15:15:25 -0400 | [diff] [blame] | 294 | spin_lock(&acct_lock); |
| 295 | acct_file_reopen(acct, NULL, NULL); |
| 296 | spin_unlock(&acct_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | } |
Eric Paris | 05b9049 | 2010-04-07 15:15:25 -0400 | [diff] [blame] | 298 | |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 299 | return error; |
| 300 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 302 | /** |
| 303 | * acct_auto_close - turn off a filesystem's accounting if it is on |
| 304 | * @m: vfsmount being shut down |
| 305 | * |
| 306 | * If the accounting is turned on for a file in the subtree pointed to |
| 307 | * to by m, turn accounting off. Done when m is about to die. |
| 308 | */ |
| 309 | void acct_auto_close_mnt(struct vfsmount *m) |
| 310 | { |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 311 | struct bsd_acct_struct *acct; |
| 312 | |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 313 | spin_lock(&acct_lock); |
Pavel Emelyanov | b5a7174 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 314 | restart: |
| 315 | list_for_each_entry(acct, &acct_list, list) |
| 316 | if (acct->file && acct->file->f_path.mnt == m) { |
| 317 | acct_file_reopen(acct, NULL, NULL); |
| 318 | goto restart; |
| 319 | } |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 320 | spin_unlock(&acct_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | |
Randy Dunlap | 417ef53 | 2005-09-10 00:26:39 -0700 | [diff] [blame] | 323 | /** |
| 324 | * acct_auto_close - turn off a filesystem's accounting if it is on |
| 325 | * @sb: super block for the filesystem |
| 326 | * |
| 327 | * If the accounting is turned on for a file in the filesystem pointed |
| 328 | * to by sb, turn accounting off. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | */ |
| 330 | void acct_auto_close(struct super_block *sb) |
| 331 | { |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 332 | struct bsd_acct_struct *acct; |
| 333 | |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 334 | spin_lock(&acct_lock); |
Pavel Emelyanov | b5a7174 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 335 | restart: |
| 336 | list_for_each_entry(acct, &acct_list, list) |
| 337 | if (acct->file && acct->file->f_path.mnt->mnt_sb == sb) { |
| 338 | acct_file_reopen(acct, NULL, NULL); |
| 339 | goto restart; |
| 340 | } |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 341 | spin_unlock(&acct_lock); |
| 342 | } |
| 343 | |
| 344 | void acct_exit_ns(struct pid_namespace *ns) |
| 345 | { |
Vitaliy Gusev | 11cad32 | 2010-05-11 14:06:56 -0700 | [diff] [blame] | 346 | struct bsd_acct_struct *acct = ns->bacct; |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 347 | |
Vitaliy Gusev | 11cad32 | 2010-05-11 14:06:56 -0700 | [diff] [blame] | 348 | if (acct == NULL) |
| 349 | return; |
| 350 | |
| 351 | del_timer_sync(&acct->timer); |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 352 | spin_lock(&acct_lock); |
Vitaliy Gusev | 11cad32 | 2010-05-11 14:06:56 -0700 | [diff] [blame] | 353 | if (acct->file != NULL) |
| 354 | acct_file_reopen(acct, NULL, NULL); |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 355 | spin_unlock(&acct_lock); |
Vitaliy Gusev | 11cad32 | 2010-05-11 14:06:56 -0700 | [diff] [blame] | 356 | |
| 357 | kfree(acct); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | /* |
| 361 | * encode an unsigned long into a comp_t |
| 362 | * |
| 363 | * This routine has been adopted from the encode_comp_t() function in |
| 364 | * the kern_acct.c file of the FreeBSD operating system. The encoding |
| 365 | * is a 13-bit fraction with a 3-bit (base 8) exponent. |
| 366 | */ |
| 367 | |
| 368 | #define MANTSIZE 13 /* 13 bit mantissa. */ |
| 369 | #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ |
| 370 | #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ |
| 371 | |
| 372 | static comp_t encode_comp_t(unsigned long value) |
| 373 | { |
| 374 | int exp, rnd; |
| 375 | |
| 376 | exp = rnd = 0; |
| 377 | while (value > MAXFRACT) { |
| 378 | rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */ |
| 379 | value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ |
| 380 | exp++; |
| 381 | } |
| 382 | |
| 383 | /* |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 384 | * If we need to round up, do it (and handle overflow correctly). |
| 385 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | if (rnd && (++value > MAXFRACT)) { |
| 387 | value >>= EXPSIZE; |
| 388 | exp++; |
| 389 | } |
| 390 | |
| 391 | /* |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 392 | * Clean it up and polish it off. |
| 393 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | exp <<= MANTSIZE; /* Shift the exponent into place */ |
| 395 | exp += value; /* and add on the mantissa. */ |
| 396 | return exp; |
| 397 | } |
| 398 | |
| 399 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
| 400 | /* |
| 401 | * encode an u64 into a comp2_t (24 bits) |
| 402 | * |
| 403 | * Format: 5 bit base 2 exponent, 20 bits mantissa. |
| 404 | * The leading bit of the mantissa is not stored, but implied for |
| 405 | * non-zero exponents. |
| 406 | * Largest encodable value is 50 bits. |
| 407 | */ |
| 408 | |
| 409 | #define MANTSIZE2 20 /* 20 bit mantissa. */ |
| 410 | #define EXPSIZE2 5 /* 5 bit base 2 exponent. */ |
| 411 | #define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */ |
| 412 | #define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */ |
| 413 | |
| 414 | static comp2_t encode_comp2_t(u64 value) |
| 415 | { |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 416 | int exp, rnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 418 | exp = (value > (MAXFRACT2>>1)); |
| 419 | rnd = 0; |
| 420 | while (value > MAXFRACT2) { |
| 421 | rnd = value & 1; |
| 422 | value >>= 1; |
| 423 | exp++; |
| 424 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 426 | /* |
| 427 | * If we need to round up, do it (and handle overflow correctly). |
| 428 | */ |
| 429 | if (rnd && (++value > MAXFRACT2)) { |
| 430 | value >>= 1; |
| 431 | exp++; |
| 432 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 434 | if (exp > MAXEXP2) { |
| 435 | /* Overflow. Return largest representable number instead. */ |
| 436 | return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1; |
| 437 | } else { |
| 438 | return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1)); |
| 439 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
| 441 | #endif |
| 442 | |
| 443 | #if ACCT_VERSION==3 |
| 444 | /* |
| 445 | * encode an u64 into a 32 bit IEEE float |
| 446 | */ |
| 447 | static u32 encode_float(u64 value) |
| 448 | { |
| 449 | unsigned exp = 190; |
| 450 | unsigned u; |
| 451 | |
| 452 | if (value==0) return 0; |
| 453 | while ((s64)value > 0){ |
| 454 | value <<= 1; |
| 455 | exp--; |
| 456 | } |
| 457 | u = (u32)(value >> 40) & 0x7fffffu; |
| 458 | return u | (exp << 23); |
| 459 | } |
| 460 | #endif |
| 461 | |
| 462 | /* |
| 463 | * Write an accounting entry for an exiting process |
| 464 | * |
| 465 | * The acct_process() call is the workhorse of the process |
| 466 | * accounting system. The struct acct is built here and then written |
| 467 | * into the accounting file. This function should only be called from |
Ingo Molnar | bcbe4a0 | 2007-11-26 21:21:49 +0100 | [diff] [blame] | 468 | * do_exit() or when switching to a different output file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | */ |
| 470 | |
| 471 | /* |
| 472 | * do_acct_process does all actual work. Caller holds the reference to file. |
| 473 | */ |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 474 | static void do_acct_process(struct bsd_acct_struct *acct, |
| 475 | struct pid_namespace *ns, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | { |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 477 | struct pacct_struct *pacct = ¤t->signal->pacct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | acct_t ac; |
| 479 | mm_segment_t fs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | unsigned long flim; |
| 481 | u64 elapsed; |
| 482 | u64 run_time; |
| 483 | struct timespec uptime; |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 484 | struct tty_struct *tty; |
Michal Schmidt | d8e180d | 2009-08-20 14:39:52 -0700 | [diff] [blame] | 485 | const struct cred *orig_cred; |
| 486 | |
| 487 | /* Perform file operations on behalf of whoever enabled accounting */ |
| 488 | orig_cred = override_creds(file->f_cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | /* |
| 491 | * First check to see if there is enough free_space to continue |
| 492 | * the process accounting system. |
| 493 | */ |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 494 | if (!check_free_space(acct, file)) |
Michal Schmidt | d8e180d | 2009-08-20 14:39:52 -0700 | [diff] [blame] | 495 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
| 497 | /* |
| 498 | * Fill the accounting struct with the needed info as recorded |
| 499 | * by the different kernel functions. |
| 500 | */ |
| 501 | memset((caddr_t)&ac, 0, sizeof(acct_t)); |
| 502 | |
| 503 | ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER; |
| 504 | strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm)); |
| 505 | |
| 506 | /* calculate run_time in nsec*/ |
| 507 | do_posix_clock_monotonic_gettime(&uptime); |
| 508 | run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec; |
KaiGai Kohei | bb231fe | 2006-03-31 02:30:45 -0800 | [diff] [blame] | 509 | run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC |
| 510 | + current->group_leader->start_time.tv_nsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* convert nsec -> AHZ */ |
| 512 | elapsed = nsec_to_AHZ(run_time); |
| 513 | #if ACCT_VERSION==3 |
| 514 | ac.ac_etime = encode_float(elapsed); |
| 515 | #else |
| 516 | ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ? |
| 517 | (unsigned long) elapsed : (unsigned long) -1l); |
| 518 | #endif |
| 519 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
| 520 | { |
| 521 | /* new enlarged etime field */ |
| 522 | comp2_t etime = encode_comp2_t(elapsed); |
| 523 | ac.ac_etime_hi = etime >> 16; |
| 524 | ac.ac_etime_lo = (u16) etime; |
| 525 | } |
| 526 | #endif |
| 527 | do_div(elapsed, AHZ); |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 528 | ac.ac_btime = get_seconds() - elapsed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | /* we really need to bite the bullet and change layout */ |
Alexey Dobriyan | 4b731d5 | 2009-12-14 17:57:34 -0800 | [diff] [blame] | 530 | ac.ac_uid = orig_cred->uid; |
| 531 | ac.ac_gid = orig_cred->gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | #if ACCT_VERSION==2 |
| 533 | ac.ac_ahz = AHZ; |
| 534 | #endif |
| 535 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
| 536 | /* backward-compatible 16 bit fields */ |
David Howells | 76aac0e | 2008-11-14 10:39:12 +1100 | [diff] [blame] | 537 | ac.ac_uid16 = ac.ac_uid; |
| 538 | ac.ac_gid16 = ac.ac_gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | #endif |
| 540 | #if ACCT_VERSION==3 |
Pavel Emelyanov | 5f7b703 | 2008-03-24 12:29:53 -0700 | [diff] [blame] | 541 | ac.ac_pid = task_tgid_nr_ns(current, ns); |
Pavel Emelyanov | a846a19 | 2008-03-24 12:29:52 -0700 | [diff] [blame] | 542 | rcu_read_lock(); |
Pavel Emelyanov | 5f7b703 | 2008-03-24 12:29:53 -0700 | [diff] [blame] | 543 | ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns); |
Pavel Emelyanov | a846a19 | 2008-03-24 12:29:52 -0700 | [diff] [blame] | 544 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | #endif |
| 546 | |
OGAWA Hirofumi | a4afee0 | 2006-07-14 00:24:18 -0700 | [diff] [blame] | 547 | spin_lock_irq(¤t->sighand->siglock); |
Alan Cox | dbda4c0 | 2008-10-13 10:40:53 +0100 | [diff] [blame] | 548 | tty = current->signal->tty; /* Safe as we hold the siglock */ |
Oleg Nesterov | 7bcfa95 | 2006-12-08 02:36:07 -0800 | [diff] [blame] | 549 | ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0; |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 550 | ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); |
| 551 | ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime))); |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 552 | ac.ac_flag = pacct->ac_flag; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 553 | ac.ac_mem = encode_comp_t(pacct->ac_mem); |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 554 | ac.ac_minflt = encode_comp_t(pacct->ac_minflt); |
| 555 | ac.ac_majflt = encode_comp_t(pacct->ac_majflt); |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 556 | ac.ac_exitcode = pacct->ac_exitcode; |
OGAWA Hirofumi | a4afee0 | 2006-07-14 00:24:18 -0700 | [diff] [blame] | 557 | spin_unlock_irq(¤t->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */ |
| 559 | ac.ac_rw = encode_comp_t(ac.ac_io / 1024); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | ac.ac_swaps = encode_comp_t(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | /* |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 563 | * Kernel segment override to datasegment and write it |
| 564 | * to the accounting file. |
| 565 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | fs = get_fs(); |
| 567 | set_fs(KERNEL_DS); |
| 568 | /* |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 569 | * Accounting records are not subject to resource limits. |
| 570 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
| 572 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; |
| 573 | file->f_op->write(file, (char *)&ac, |
| 574 | sizeof(acct_t), &file->f_pos); |
| 575 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim; |
| 576 | set_fs(fs); |
Michal Schmidt | d8e180d | 2009-08-20 14:39:52 -0700 | [diff] [blame] | 577 | out: |
| 578 | revert_creds(orig_cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | } |
| 580 | |
Randy Dunlap | 417ef53 | 2005-09-10 00:26:39 -0700 | [diff] [blame] | 581 | /** |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 582 | * acct_collect - collect accounting information into pacct_struct |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 583 | * @exitcode: task exit code |
| 584 | * @group_dead: not 0, if this thread is the last one in the process. |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 585 | */ |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 586 | void acct_collect(long exitcode, int group_dead) |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 587 | { |
| 588 | struct pacct_struct *pacct = ¤t->signal->pacct; |
| 589 | unsigned long vsize = 0; |
| 590 | |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 591 | if (group_dead && current->mm) { |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 592 | struct vm_area_struct *vma; |
| 593 | down_read(¤t->mm->mmap_sem); |
| 594 | vma = current->mm->mmap; |
| 595 | while (vma) { |
| 596 | vsize += vma->vm_end - vma->vm_start; |
| 597 | vma = vma->vm_next; |
| 598 | } |
| 599 | up_read(¤t->mm->mmap_sem); |
| 600 | } |
| 601 | |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 602 | spin_lock_irq(¤t->sighand->siglock); |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 603 | if (group_dead) |
| 604 | pacct->ac_mem = vsize / 1024; |
| 605 | if (thread_group_leader(current)) { |
| 606 | pacct->ac_exitcode = exitcode; |
| 607 | if (current->flags & PF_FORKNOEXEC) |
| 608 | pacct->ac_flag |= AFORK; |
| 609 | } |
| 610 | if (current->flags & PF_SUPERPRIV) |
| 611 | pacct->ac_flag |= ASU; |
| 612 | if (current->flags & PF_DUMPCORE) |
| 613 | pacct->ac_flag |= ACORE; |
| 614 | if (current->flags & PF_SIGNALED) |
| 615 | pacct->ac_flag |= AXSIG; |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 616 | pacct->ac_utime = cputime_add(pacct->ac_utime, current->utime); |
| 617 | pacct->ac_stime = cputime_add(pacct->ac_stime, current->stime); |
| 618 | pacct->ac_minflt += current->min_flt; |
| 619 | pacct->ac_majflt += current->maj_flt; |
| 620 | spin_unlock_irq(¤t->sighand->siglock); |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 621 | } |
| 622 | |
Pavel Emelyanov | 7d1e135 | 2008-07-25 01:48:48 -0700 | [diff] [blame] | 623 | static void acct_process_in_ns(struct pid_namespace *ns) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | { |
| 625 | struct file *file = NULL; |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 626 | struct bsd_acct_struct *acct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 628 | acct = ns->bacct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | /* |
| 630 | * accelerate the common fastpath: |
| 631 | */ |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 632 | if (!acct || !acct->file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | return; |
| 634 | |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 635 | spin_lock(&acct_lock); |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 636 | file = acct->file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | if (unlikely(!file)) { |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 638 | spin_unlock(&acct_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | return; |
| 640 | } |
| 641 | get_file(file); |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 642 | spin_unlock(&acct_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 644 | do_acct_process(acct, ns, file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | fput(file); |
| 646 | } |
Pavel Emelyanov | 7d1e135 | 2008-07-25 01:48:48 -0700 | [diff] [blame] | 647 | |
| 648 | /** |
Pavel Emelyanov | 0c18d7a | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 649 | * acct_process - now just a wrapper around acct_process_in_ns, |
| 650 | * which in turn is a wrapper around do_acct_process. |
Pavel Emelyanov | 7d1e135 | 2008-07-25 01:48:48 -0700 | [diff] [blame] | 651 | * |
| 652 | * handles process accounting for an exiting task |
| 653 | */ |
| 654 | void acct_process(void) |
| 655 | { |
| 656 | struct pid_namespace *ns; |
| 657 | |
Pavel Emelyanov | 0c18d7a | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 658 | /* |
| 659 | * This loop is safe lockless, since current is still |
| 660 | * alive and holds its namespace, which in turn holds |
| 661 | * its parent. |
| 662 | */ |
Pavel Emelyanov | 7d1e135 | 2008-07-25 01:48:48 -0700 | [diff] [blame] | 663 | for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent) |
| 664 | acct_process_in_ns(ns); |
| 665 | } |