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> |
Paul McQuade | 7153e40 | 2014-06-06 14:37:37 -0700 | [diff] [blame] | 58 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 62 | #include <../fs/mount.h> /* will go away when we refactor */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | /* |
| 65 | * These constants control the amount of freespace that suspend and |
| 66 | * resume the process accounting system, and the time delay between |
| 67 | * each check. |
| 68 | * Turned into sysctl-controllable parameters. AV, 12/11/98 |
| 69 | */ |
| 70 | |
| 71 | int acct_parm[3] = {4, 2, 30}; |
| 72 | #define RESUME (acct_parm[0]) /* >foo% free space - resume */ |
| 73 | #define SUSPEND (acct_parm[1]) /* <foo% free space - suspend */ |
| 74 | #define ACCT_TIMEOUT (acct_parm[2]) /* foo second timeout between checks */ |
| 75 | |
| 76 | /* |
| 77 | * External references and all of the globals. |
| 78 | */ |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 79 | static void do_acct_process(struct bsd_acct_struct *acct); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Pavel Emelyanov | 081e4c8 | 2008-07-25 01:48:42 -0700 | [diff] [blame] | 81 | struct bsd_acct_struct { |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 82 | atomic_long_t count; |
| 83 | union { |
| 84 | struct { |
| 85 | struct hlist_node s_list; |
| 86 | struct hlist_node m_list; |
| 87 | }; |
| 88 | struct rcu_head rcu; |
| 89 | }; |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 90 | struct mutex lock; |
Al Viro | 32dc730 | 2011-12-08 20:08:42 -0500 | [diff] [blame] | 91 | int active; |
| 92 | unsigned long needcheck; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | struct file *file; |
Pavel Emelyanov | 5f7b703 | 2008-03-24 12:29:53 -0700 | [diff] [blame] | 94 | struct pid_namespace *ns; |
Al Viro | 17c0a5a | 2014-08-07 07:35:19 -0400 | [diff] [blame^] | 95 | struct work_struct work; |
| 96 | struct completion done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | }; |
| 98 | |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 99 | static void acct_free_rcu(struct rcu_head *head) |
| 100 | { |
| 101 | kfree(container_of(head, struct bsd_acct_struct, rcu)); |
| 102 | } |
| 103 | |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 104 | static DEFINE_SPINLOCK(acct_lock); |
| 105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | * Check the amount of free space and suspend/resume accordingly. |
| 108 | */ |
Al Viro | 54a4d58 | 2014-04-19 14:24:18 -0400 | [diff] [blame] | 109 | static int check_free_space(struct bsd_acct_struct *acct) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | { |
| 111 | struct kstatfs sbuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Al Viro | 54a4d58 | 2014-04-19 14:24:18 -0400 | [diff] [blame] | 113 | if (time_is_before_jiffies(acct->needcheck)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
| 116 | /* May block */ |
Al Viro | 54a4d58 | 2014-04-19 14:24:18 -0400 | [diff] [blame] | 117 | if (vfs_statfs(&acct->file->f_path, &sbuf)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 120 | if (acct->active) { |
Al Viro | 54a4d58 | 2014-04-19 14:24:18 -0400 | [diff] [blame] | 121 | u64 suspend = sbuf.f_blocks * SUSPEND; |
| 122 | do_div(suspend, 100); |
| 123 | if (sbuf.f_bavail <= suspend) { |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 124 | acct->active = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | printk(KERN_INFO "Process accounting paused\n"); |
| 126 | } |
| 127 | } else { |
Al Viro | 54a4d58 | 2014-04-19 14:24:18 -0400 | [diff] [blame] | 128 | u64 resume = sbuf.f_blocks * RESUME; |
| 129 | do_div(resume, 100); |
| 130 | if (sbuf.f_bavail >= resume) { |
Pavel Emelyanov | 6248b1b | 2008-07-25 01:48:46 -0700 | [diff] [blame] | 131 | acct->active = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | printk(KERN_INFO "Process accounting resumed\n"); |
| 133 | } |
| 134 | } |
| 135 | |
Al Viro | 32dc730 | 2011-12-08 20:08:42 -0500 | [diff] [blame] | 136 | acct->needcheck = jiffies + ACCT_TIMEOUT*HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | out: |
Al Viro | 54a4d58 | 2014-04-19 14:24:18 -0400 | [diff] [blame] | 138 | return acct->active; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 141 | static void acct_put(struct bsd_acct_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 143 | if (atomic_long_dec_and_test(&p->count)) |
| 144 | call_rcu(&p->rcu, acct_free_rcu); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 145 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 147 | static struct bsd_acct_struct *__acct_get(struct bsd_acct_struct *res) |
| 148 | { |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 149 | if (!atomic_long_inc_not_zero(&res->count)) { |
| 150 | rcu_read_unlock(); |
| 151 | cpu_relax(); |
| 152 | return NULL; |
| 153 | } |
| 154 | rcu_read_unlock(); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 155 | mutex_lock(&res->lock); |
| 156 | if (!res->ns) { |
| 157 | mutex_unlock(&res->lock); |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 158 | acct_put(res); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 159 | return NULL; |
| 160 | } |
| 161 | return res; |
| 162 | } |
| 163 | |
| 164 | static struct bsd_acct_struct *acct_get(struct pid_namespace *ns) |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 165 | { |
| 166 | struct bsd_acct_struct *res; |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 167 | again: |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 168 | smp_rmb(); |
| 169 | rcu_read_lock(); |
| 170 | res = ACCESS_ONCE(ns->bacct); |
| 171 | if (!res) { |
| 172 | rcu_read_unlock(); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 173 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 175 | res = __acct_get(res); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 176 | if (!res) |
| 177 | goto again; |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 178 | return res; |
| 179 | } |
| 180 | |
Al Viro | 17c0a5a | 2014-08-07 07:35:19 -0400 | [diff] [blame^] | 181 | static void close_work(struct work_struct *work) |
| 182 | { |
| 183 | struct bsd_acct_struct *acct = container_of(work, struct bsd_acct_struct, work); |
| 184 | struct file *file = acct->file; |
| 185 | mnt_unpin(file->f_path.mnt); |
| 186 | if (file->f_op->flush) |
| 187 | file->f_op->flush(file, NULL); |
| 188 | __fput_sync(file); |
| 189 | complete(&acct->done); |
| 190 | } |
| 191 | |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 192 | static void acct_kill(struct bsd_acct_struct *acct, |
| 193 | struct bsd_acct_struct *new) |
| 194 | { |
| 195 | if (acct) { |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 196 | struct pid_namespace *ns = acct->ns; |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 197 | do_acct_process(acct); |
Al Viro | 17c0a5a | 2014-08-07 07:35:19 -0400 | [diff] [blame^] | 198 | INIT_WORK(&acct->work, close_work); |
| 199 | init_completion(&acct->done); |
| 200 | schedule_work(&acct->work); |
| 201 | wait_for_completion(&acct->done); |
Pavel Emelyanov | a75d979 | 2008-07-25 01:48:45 -0700 | [diff] [blame] | 202 | spin_lock(&acct_lock); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 203 | hlist_del(&acct->m_list); |
| 204 | hlist_del(&acct->s_list); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 205 | spin_unlock(&acct_lock); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 206 | ns->bacct = new; |
| 207 | if (new) { |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 208 | struct vfsmount *m = new->file->f_path.mnt; |
| 209 | mnt_pin(m); |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 210 | spin_lock(&acct_lock); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 211 | hlist_add_head(&new->s_list, &m->mnt_sb->s_pins); |
| 212 | hlist_add_head(&new->m_list, &real_mount(m)->mnt_pins); |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 213 | spin_unlock(&acct_lock); |
| 214 | mutex_unlock(&new->lock); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 215 | } |
| 216 | acct->ns = NULL; |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 217 | atomic_long_dec(&acct->count); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 218 | mutex_unlock(&acct->lock); |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 219 | acct_put(acct); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
| 221 | } |
| 222 | |
Jeff Layton | 669abf4 | 2012-10-10 16:43:10 -0400 | [diff] [blame] | 223 | static int acct_on(struct filename *pathname) |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 224 | { |
| 225 | struct file *file; |
Renaud Lottiaux | df279ca | 2009-06-30 11:41:34 -0700 | [diff] [blame] | 226 | struct vfsmount *mnt; |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 227 | struct pid_namespace *ns = task_active_pid_ns(current); |
| 228 | struct bsd_acct_struct *acct, *old; |
| 229 | |
| 230 | acct = kzalloc(sizeof(struct bsd_acct_struct), GFP_KERNEL); |
| 231 | if (!acct) |
| 232 | return -ENOMEM; |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 233 | |
| 234 | /* Difference from BSD - they don't do O_APPEND */ |
Jeff Layton | 669abf4 | 2012-10-10 16:43:10 -0400 | [diff] [blame] | 235 | file = file_open_name(pathname, O_WRONLY|O_APPEND|O_LARGEFILE, 0); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 236 | if (IS_ERR(file)) { |
| 237 | kfree(acct); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 238 | return PTR_ERR(file); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 239 | } |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 240 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 241 | if (!S_ISREG(file_inode(file)->i_mode)) { |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 242 | kfree(acct); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 243 | filp_close(file, NULL); |
| 244 | return -EACCES; |
| 245 | } |
| 246 | |
| 247 | if (!file->f_op->write) { |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 248 | kfree(acct); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 249 | filp_close(file, NULL); |
| 250 | return -EIO; |
| 251 | } |
| 252 | |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 253 | atomic_long_set(&acct->count, 1); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 254 | acct->file = file; |
| 255 | acct->needcheck = jiffies; |
| 256 | acct->ns = ns; |
| 257 | mutex_init(&acct->lock); |
Renaud Lottiaux | df279ca | 2009-06-30 11:41:34 -0700 | [diff] [blame] | 258 | mnt = file->f_path.mnt; |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 259 | |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 260 | old = acct_get(ns); |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 261 | mutex_lock_nested(&acct->lock, 1); /* nobody has seen it yet */ |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 262 | if (old) { |
| 263 | acct_kill(old, acct); |
| 264 | } else { |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 265 | ns->bacct = acct; |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 266 | spin_lock(&acct_lock); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 267 | mnt_pin(mnt); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 268 | hlist_add_head(&acct->s_list, &mnt->mnt_sb->s_pins); |
| 269 | hlist_add_head(&acct->m_list, &real_mount(mnt)->mnt_pins); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 270 | spin_unlock(&acct_lock); |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 271 | mutex_unlock(&acct->lock); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 272 | } |
Renaud Lottiaux | df279ca | 2009-06-30 11:41:34 -0700 | [diff] [blame] | 273 | mntput(mnt); /* it's pinned, now give up active reference */ |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 274 | return 0; |
| 275 | } |
| 276 | |
Al Viro | 9df7fa1 | 2014-05-15 06:49:45 -0400 | [diff] [blame] | 277 | static DEFINE_MUTEX(acct_on_mutex); |
| 278 | |
Randy Dunlap | 417ef53 | 2005-09-10 00:26:39 -0700 | [diff] [blame] | 279 | /** |
| 280 | * sys_acct - enable/disable process accounting |
| 281 | * @name: file name for accounting records or NULL to shutdown accounting |
| 282 | * |
| 283 | * Returns 0 for success or negative errno values for failure. |
| 284 | * |
| 285 | * sys_acct() is the only system call needed to implement process |
| 286 | * accounting. It takes the name of the file where accounting records |
| 287 | * should be written. If the filename is NULL, accounting will be |
| 288 | * shutdown. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | */ |
Heiko Carstens | b290ebe | 2009-01-14 14:14:06 +0100 | [diff] [blame] | 290 | SYSCALL_DEFINE1(acct, const char __user *, name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | { |
Eric Paris | 05b9049 | 2010-04-07 15:15:25 -0400 | [diff] [blame] | 292 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | if (!capable(CAP_SYS_PACCT)) |
| 295 | return -EPERM; |
| 296 | |
| 297 | if (name) { |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 298 | struct filename *tmp = getname(name); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 299 | if (IS_ERR(tmp)) |
Paul McQuade | 46c0a8c | 2014-06-06 14:37:37 -0700 | [diff] [blame] | 300 | return PTR_ERR(tmp); |
Al Viro | 9df7fa1 | 2014-05-15 06:49:45 -0400 | [diff] [blame] | 301 | mutex_lock(&acct_on_mutex); |
Jeff Layton | 669abf4 | 2012-10-10 16:43:10 -0400 | [diff] [blame] | 302 | error = acct_on(tmp); |
Al Viro | 9df7fa1 | 2014-05-15 06:49:45 -0400 | [diff] [blame] | 303 | mutex_unlock(&acct_on_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | putname(tmp); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 305 | } else { |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 306 | acct_kill(acct_get(task_active_pid_ns(current)), NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
Eric Paris | 05b9049 | 2010-04-07 15:15:25 -0400 | [diff] [blame] | 308 | |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 309 | return error; |
| 310 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 312 | void acct_auto_close_mnt(struct hlist_head *list) |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 313 | { |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 314 | rcu_read_lock(); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 315 | while (1) { |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 316 | struct hlist_node *p = ACCESS_ONCE(list->first); |
| 317 | if (!p) |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 318 | break; |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 319 | acct_kill(__acct_get(hlist_entry(p, |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 320 | struct bsd_acct_struct, |
| 321 | m_list)), NULL); |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 322 | rcu_read_lock(); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 323 | } |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 324 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
| 326 | |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 327 | void acct_auto_close(struct hlist_head *list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 329 | rcu_read_lock(); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 330 | while (1) { |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 331 | struct hlist_node *p = ACCESS_ONCE(list->first); |
| 332 | if (!p) |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 333 | break; |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 334 | acct_kill(__acct_get(hlist_entry(p, |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 335 | struct bsd_acct_struct, |
| 336 | s_list)), NULL); |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 337 | rcu_read_lock(); |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 338 | } |
Al Viro | 2798d4c | 2014-08-07 07:04:28 -0400 | [diff] [blame] | 339 | rcu_read_unlock(); |
Pavel Emelyanov | 0b6b030 | 2008-07-25 01:48:47 -0700 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | void acct_exit_ns(struct pid_namespace *ns) |
| 343 | { |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 344 | acct_kill(acct_get(ns), NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /* |
| 348 | * encode an unsigned long into a comp_t |
| 349 | * |
| 350 | * This routine has been adopted from the encode_comp_t() function in |
| 351 | * the kern_acct.c file of the FreeBSD operating system. The encoding |
| 352 | * is a 13-bit fraction with a 3-bit (base 8) exponent. |
| 353 | */ |
| 354 | |
| 355 | #define MANTSIZE 13 /* 13 bit mantissa. */ |
| 356 | #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ |
| 357 | #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ |
| 358 | |
| 359 | static comp_t encode_comp_t(unsigned long value) |
| 360 | { |
| 361 | int exp, rnd; |
| 362 | |
| 363 | exp = rnd = 0; |
| 364 | while (value > MAXFRACT) { |
| 365 | rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */ |
| 366 | value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ |
| 367 | exp++; |
| 368 | } |
| 369 | |
| 370 | /* |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 371 | * If we need to round up, do it (and handle overflow correctly). |
| 372 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | if (rnd && (++value > MAXFRACT)) { |
| 374 | value >>= EXPSIZE; |
| 375 | exp++; |
| 376 | } |
| 377 | |
| 378 | /* |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 379 | * Clean it up and polish it off. |
| 380 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | exp <<= MANTSIZE; /* Shift the exponent into place */ |
| 382 | exp += value; /* and add on the mantissa. */ |
| 383 | return exp; |
| 384 | } |
| 385 | |
| 386 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
| 387 | /* |
| 388 | * encode an u64 into a comp2_t (24 bits) |
| 389 | * |
| 390 | * Format: 5 bit base 2 exponent, 20 bits mantissa. |
| 391 | * The leading bit of the mantissa is not stored, but implied for |
| 392 | * non-zero exponents. |
| 393 | * Largest encodable value is 50 bits. |
| 394 | */ |
| 395 | |
| 396 | #define MANTSIZE2 20 /* 20 bit mantissa. */ |
| 397 | #define EXPSIZE2 5 /* 5 bit base 2 exponent. */ |
| 398 | #define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */ |
| 399 | #define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */ |
| 400 | |
| 401 | static comp2_t encode_comp2_t(u64 value) |
| 402 | { |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 403 | int exp, rnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 405 | exp = (value > (MAXFRACT2>>1)); |
| 406 | rnd = 0; |
| 407 | while (value > MAXFRACT2) { |
| 408 | rnd = value & 1; |
| 409 | value >>= 1; |
| 410 | exp++; |
| 411 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 413 | /* |
| 414 | * If we need to round up, do it (and handle overflow correctly). |
| 415 | */ |
| 416 | if (rnd && (++value > MAXFRACT2)) { |
| 417 | value >>= 1; |
| 418 | exp++; |
| 419 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
Daniel Walker | 6ae965c | 2007-10-18 03:06:04 -0700 | [diff] [blame] | 421 | if (exp > MAXEXP2) { |
| 422 | /* Overflow. Return largest representable number instead. */ |
| 423 | return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1; |
| 424 | } else { |
| 425 | return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1)); |
| 426 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } |
| 428 | #endif |
| 429 | |
| 430 | #if ACCT_VERSION==3 |
| 431 | /* |
| 432 | * encode an u64 into a 32 bit IEEE float |
| 433 | */ |
| 434 | static u32 encode_float(u64 value) |
| 435 | { |
| 436 | unsigned exp = 190; |
| 437 | unsigned u; |
| 438 | |
| 439 | if (value==0) return 0; |
| 440 | while ((s64)value > 0){ |
| 441 | value <<= 1; |
| 442 | exp--; |
| 443 | } |
| 444 | u = (u32)(value >> 40) & 0x7fffffu; |
| 445 | return u | (exp << 23); |
| 446 | } |
| 447 | #endif |
| 448 | |
| 449 | /* |
| 450 | * Write an accounting entry for an exiting process |
| 451 | * |
| 452 | * The acct_process() call is the workhorse of the process |
| 453 | * accounting system. The struct acct is built here and then written |
| 454 | * into the accounting file. This function should only be called from |
Ingo Molnar | bcbe4a0 | 2007-11-26 21:21:49 +0100 | [diff] [blame] | 455 | * do_exit() or when switching to a different output file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | */ |
| 457 | |
Al Viro | cdd37e2 | 2014-04-26 23:45:53 -0400 | [diff] [blame] | 458 | static void fill_ac(acct_t *ac) |
| 459 | { |
| 460 | struct pacct_struct *pacct = ¤t->signal->pacct; |
| 461 | u64 elapsed, run_time; |
| 462 | struct tty_struct *tty; |
| 463 | |
| 464 | /* |
| 465 | * Fill the accounting struct with the needed info as recorded |
| 466 | * by the different kernel functions. |
| 467 | */ |
| 468 | memset(ac, 0, sizeof(acct_t)); |
| 469 | |
| 470 | ac->ac_version = ACCT_VERSION | ACCT_BYTEORDER; |
| 471 | strlcpy(ac->ac_comm, current->comm, sizeof(ac->ac_comm)); |
| 472 | |
| 473 | /* calculate run_time in nsec*/ |
| 474 | run_time = ktime_get_ns(); |
| 475 | run_time -= current->group_leader->start_time; |
| 476 | /* convert nsec -> AHZ */ |
| 477 | elapsed = nsec_to_AHZ(run_time); |
| 478 | #if ACCT_VERSION==3 |
| 479 | ac->ac_etime = encode_float(elapsed); |
| 480 | #else |
| 481 | ac->ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ? |
| 482 | (unsigned long) elapsed : (unsigned long) -1l); |
| 483 | #endif |
| 484 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
| 485 | { |
| 486 | /* new enlarged etime field */ |
| 487 | comp2_t etime = encode_comp2_t(elapsed); |
| 488 | ac->ac_etime_hi = etime >> 16; |
| 489 | ac->ac_etime_lo = (u16) etime; |
| 490 | } |
| 491 | #endif |
| 492 | do_div(elapsed, AHZ); |
| 493 | ac->ac_btime = get_seconds() - elapsed; |
| 494 | #if ACCT_VERSION==2 |
| 495 | ac->ac_ahz = AHZ; |
| 496 | #endif |
| 497 | |
| 498 | spin_lock_irq(¤t->sighand->siglock); |
| 499 | tty = current->signal->tty; /* Safe as we hold the siglock */ |
| 500 | ac->ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0; |
| 501 | ac->ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); |
| 502 | ac->ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime))); |
| 503 | ac->ac_flag = pacct->ac_flag; |
| 504 | ac->ac_mem = encode_comp_t(pacct->ac_mem); |
| 505 | ac->ac_minflt = encode_comp_t(pacct->ac_minflt); |
| 506 | ac->ac_majflt = encode_comp_t(pacct->ac_majflt); |
| 507 | ac->ac_exitcode = pacct->ac_exitcode; |
| 508 | spin_unlock_irq(¤t->sighand->siglock); |
| 509 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | /* |
| 511 | * do_acct_process does all actual work. Caller holds the reference to file. |
| 512 | */ |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 513 | static void do_acct_process(struct bsd_acct_struct *acct) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | { |
| 515 | acct_t ac; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | unsigned long flim; |
Michal Schmidt | d8e180d | 2009-08-20 14:39:52 -0700 | [diff] [blame] | 517 | const struct cred *orig_cred; |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 518 | struct pid_namespace *ns = acct->ns; |
| 519 | struct file *file = acct->file; |
Michal Schmidt | d8e180d | 2009-08-20 14:39:52 -0700 | [diff] [blame] | 520 | |
Al Viro | ed44724 | 2014-04-19 14:37:20 -0400 | [diff] [blame] | 521 | /* |
| 522 | * Accounting records are not subject to resource limits. |
| 523 | */ |
| 524 | flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
| 525 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; |
Michal Schmidt | d8e180d | 2009-08-20 14:39:52 -0700 | [diff] [blame] | 526 | /* Perform file operations on behalf of whoever enabled accounting */ |
| 527 | orig_cred = override_creds(file->f_cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
| 529 | /* |
| 530 | * First check to see if there is enough free_space to continue |
| 531 | * the process accounting system. |
| 532 | */ |
Al Viro | 54a4d58 | 2014-04-19 14:24:18 -0400 | [diff] [blame] | 533 | if (!check_free_space(acct)) |
Michal Schmidt | d8e180d | 2009-08-20 14:39:52 -0700 | [diff] [blame] | 534 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
Al Viro | cdd37e2 | 2014-04-26 23:45:53 -0400 | [diff] [blame] | 536 | fill_ac(&ac); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | /* we really need to bite the bullet and change layout */ |
Eric W. Biederman | f8f3d4d | 2012-02-07 16:54:50 -0800 | [diff] [blame] | 538 | ac.ac_uid = from_kuid_munged(file->f_cred->user_ns, orig_cred->uid); |
| 539 | ac.ac_gid = from_kgid_munged(file->f_cred->user_ns, orig_cred->gid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
| 541 | /* backward-compatible 16 bit fields */ |
David Howells | 76aac0e | 2008-11-14 10:39:12 +1100 | [diff] [blame] | 542 | ac.ac_uid16 = ac.ac_uid; |
| 543 | ac.ac_gid16 = ac.ac_gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | #endif |
| 545 | #if ACCT_VERSION==3 |
Pavel Emelyanov | 5f7b703 | 2008-03-24 12:29:53 -0700 | [diff] [blame] | 546 | ac.ac_pid = task_tgid_nr_ns(current, ns); |
Pavel Emelyanov | a846a19 | 2008-03-24 12:29:52 -0700 | [diff] [blame] | 547 | rcu_read_lock(); |
Pavel Emelyanov | 5f7b703 | 2008-03-24 12:29:53 -0700 | [diff] [blame] | 548 | 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] | 549 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | /* |
Jan Kara | 5ae98f1 | 2013-05-04 00:11:23 +0200 | [diff] [blame] | 552 | * Get freeze protection. If the fs is frozen, just skip the write |
| 553 | * as we could deadlock the system otherwise. |
| 554 | */ |
Al Viro | ed44724 | 2014-04-19 14:37:20 -0400 | [diff] [blame] | 555 | if (file_start_write_trylock(file)) { |
| 556 | /* it's been opened O_APPEND, so position is irrelevant */ |
| 557 | loff_t pos = 0; |
| 558 | __kernel_write(file, (char *)&ac, sizeof(acct_t), &pos); |
| 559 | file_end_write(file); |
| 560 | } |
Michal Schmidt | d8e180d | 2009-08-20 14:39:52 -0700 | [diff] [blame] | 561 | out: |
Al Viro | ed44724 | 2014-04-19 14:37:20 -0400 | [diff] [blame] | 562 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim; |
Michal Schmidt | d8e180d | 2009-08-20 14:39:52 -0700 | [diff] [blame] | 563 | revert_creds(orig_cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } |
| 565 | |
Randy Dunlap | 417ef53 | 2005-09-10 00:26:39 -0700 | [diff] [blame] | 566 | /** |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 567 | * acct_collect - collect accounting information into pacct_struct |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 568 | * @exitcode: task exit code |
| 569 | * @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] | 570 | */ |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 571 | void acct_collect(long exitcode, int group_dead) |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 572 | { |
| 573 | struct pacct_struct *pacct = ¤t->signal->pacct; |
Frederic Weisbecker | 6fac482 | 2012-11-13 14:20:55 +0100 | [diff] [blame] | 574 | cputime_t utime, stime; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 575 | unsigned long vsize = 0; |
| 576 | |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 577 | if (group_dead && current->mm) { |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 578 | struct vm_area_struct *vma; |
| 579 | down_read(¤t->mm->mmap_sem); |
| 580 | vma = current->mm->mmap; |
| 581 | while (vma) { |
| 582 | vsize += vma->vm_end - vma->vm_start; |
| 583 | vma = vma->vm_next; |
| 584 | } |
| 585 | up_read(¤t->mm->mmap_sem); |
| 586 | } |
| 587 | |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 588 | spin_lock_irq(¤t->sighand->siglock); |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 589 | if (group_dead) |
| 590 | pacct->ac_mem = vsize / 1024; |
| 591 | if (thread_group_leader(current)) { |
| 592 | pacct->ac_exitcode = exitcode; |
| 593 | if (current->flags & PF_FORKNOEXEC) |
| 594 | pacct->ac_flag |= AFORK; |
| 595 | } |
| 596 | if (current->flags & PF_SUPERPRIV) |
| 597 | pacct->ac_flag |= ASU; |
| 598 | if (current->flags & PF_DUMPCORE) |
| 599 | pacct->ac_flag |= ACORE; |
| 600 | if (current->flags & PF_SIGNALED) |
| 601 | pacct->ac_flag |= AXSIG; |
Frederic Weisbecker | 6fac482 | 2012-11-13 14:20:55 +0100 | [diff] [blame] | 602 | task_cputime(current, &utime, &stime); |
| 603 | pacct->ac_utime += utime; |
| 604 | pacct->ac_stime += stime; |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 605 | pacct->ac_minflt += current->min_flt; |
| 606 | pacct->ac_majflt += current->maj_flt; |
| 607 | spin_unlock_irq(¤t->sighand->siglock); |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Al Viro | e25ff11 | 2014-05-07 05:12:09 -0400 | [diff] [blame] | 610 | static void slow_acct_process(struct pid_namespace *ns) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | { |
Al Viro | e25ff11 | 2014-05-07 05:12:09 -0400 | [diff] [blame] | 612 | for ( ; ns; ns = ns->parent) { |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 613 | struct bsd_acct_struct *acct = acct_get(ns); |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 614 | if (acct) { |
| 615 | do_acct_process(acct); |
| 616 | mutex_unlock(&acct->lock); |
| 617 | acct_put(acct); |
Al Viro | e25ff11 | 2014-05-07 05:12:09 -0400 | [diff] [blame] | 618 | } |
Al Viro | e25ff11 | 2014-05-07 05:12:09 -0400 | [diff] [blame] | 619 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | } |
Pavel Emelyanov | 7d1e135 | 2008-07-25 01:48:48 -0700 | [diff] [blame] | 621 | |
| 622 | /** |
Al Viro | e25ff11 | 2014-05-07 05:12:09 -0400 | [diff] [blame] | 623 | * acct_process |
Pavel Emelyanov | 7d1e135 | 2008-07-25 01:48:48 -0700 | [diff] [blame] | 624 | * |
| 625 | * handles process accounting for an exiting task |
| 626 | */ |
| 627 | void acct_process(void) |
| 628 | { |
| 629 | struct pid_namespace *ns; |
| 630 | |
Pavel Emelyanov | 0c18d7a | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 631 | /* |
| 632 | * This loop is safe lockless, since current is still |
| 633 | * alive and holds its namespace, which in turn holds |
| 634 | * its parent. |
| 635 | */ |
Al Viro | e25ff11 | 2014-05-07 05:12:09 -0400 | [diff] [blame] | 636 | for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent) { |
Al Viro | b8f00e6 | 2014-08-07 07:51:03 -0400 | [diff] [blame] | 637 | if (ns->bacct) |
Al Viro | e25ff11 | 2014-05-07 05:12:09 -0400 | [diff] [blame] | 638 | break; |
| 639 | } |
| 640 | if (unlikely(ns)) |
| 641 | slow_acct_process(ns); |
Pavel Emelyanov | 7d1e135 | 2008-07-25 01:48:48 -0700 | [diff] [blame] | 642 | } |