4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * proc base directory handling functions
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
50 #include <asm/uaccess.h>
52 #include <linux/errno.h>
53 #include <linux/time.h>
54 #include <linux/proc_fs.h>
55 #include <linux/stat.h>
56 #include <linux/task_io_accounting_ops.h>
57 #include <linux/init.h>
58 #include <linux/capability.h>
59 #include <linux/file.h>
60 #include <linux/fdtable.h>
61 #include <linux/string.h>
62 #include <linux/seq_file.h>
63 #include <linux/namei.h>
64 #include <linux/mnt_namespace.h>
66 #include <linux/rcupdate.h>
67 #include <linux/kallsyms.h>
68 #include <linux/resource.h>
69 #include <linux/module.h>
70 #include <linux/mount.h>
71 #include <linux/security.h>
72 #include <linux/ptrace.h>
73 #include <linux/tracehook.h>
74 #include <linux/cgroup.h>
75 #include <linux/cpuset.h>
76 #include <linux/audit.h>
77 #include <linux/poll.h>
78 #include <linux/nsproxy.h>
79 #include <linux/oom.h>
80 #include <linux/elf.h>
81 #include <linux/pid_namespace.h>
85 * Implementing inode permission operations in /proc is almost
86 * certainly an error. Permission checks need to happen during
87 * each system call not at open time. The reason is that most of
88 * what we wish to check for permissions in /proc varies at runtime.
90 * The classic example of a problem is opening file descriptors
91 * in /proc for a task before it execs a suid executable.
98 const struct inode_operations *iop;
99 const struct file_operations *fop;
103 #define NOD(NAME, MODE, IOP, FOP, OP) { \
105 .len = sizeof(NAME) - 1, \
112 #define DIR(NAME, MODE, OTYPE) \
113 NOD(NAME, (S_IFDIR|(MODE)), \
114 &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \
116 #define LNK(NAME, OTYPE) \
117 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
118 &proc_pid_link_inode_operations, NULL, \
119 { .proc_get_link = &proc_##OTYPE##_link } )
120 #define REG(NAME, MODE, OTYPE) \
121 NOD(NAME, (S_IFREG|(MODE)), NULL, \
122 &proc_##OTYPE##_operations, {})
123 #define INF(NAME, MODE, OTYPE) \
124 NOD(NAME, (S_IFREG|(MODE)), \
125 NULL, &proc_info_file_operations, \
126 { .proc_read = &proc_##OTYPE } )
127 #define ONE(NAME, MODE, OTYPE) \
128 NOD(NAME, (S_IFREG|(MODE)), \
129 NULL, &proc_single_file_operations, \
130 { .proc_show = &proc_##OTYPE } )
133 * Count the number of hardlinks for the pid_entry table, excluding the .
136 static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
143 for (i = 0; i < n; ++i) {
144 if (S_ISDIR(entries[i].mode))
151 static struct fs_struct *get_fs_struct(struct task_struct *task)
153 struct fs_struct *fs;
157 atomic_inc(&fs->count);
162 static int get_nr_threads(struct task_struct *tsk)
167 if (lock_task_sighand(tsk, &flags)) {
168 count = atomic_read(&tsk->signal->count);
169 unlock_task_sighand(tsk, &flags);
174 static int proc_cwd_link(struct inode *inode, struct path *path)
176 struct task_struct *task = get_proc_task(inode);
177 struct fs_struct *fs = NULL;
178 int result = -ENOENT;
181 fs = get_fs_struct(task);
182 put_task_struct(task);
185 read_lock(&fs->lock);
188 read_unlock(&fs->lock);
195 static int proc_root_link(struct inode *inode, struct path *path)
197 struct task_struct *task = get_proc_task(inode);
198 struct fs_struct *fs = NULL;
199 int result = -ENOENT;
202 fs = get_fs_struct(task);
203 put_task_struct(task);
206 read_lock(&fs->lock);
209 read_unlock(&fs->lock);
217 * Return zero if current may access user memory in @task, -error if not.
219 static int check_mem_permission(struct task_struct *task)
222 * A task can always look at itself, in case it chooses
223 * to use system calls instead of load instructions.
229 * If current is actively ptrace'ing, and would also be
230 * permitted to freshly attach with ptrace now, permit it.
232 if (task_is_stopped_or_traced(task)) {
235 match = (tracehook_tracer_task(task) == current);
237 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
242 * Noone else is allowed.
247 struct mm_struct *mm_for_maps(struct task_struct *task)
249 struct mm_struct *mm = get_task_mm(task);
252 down_read(&mm->mmap_sem);
256 if (task->mm != current->mm &&
257 __ptrace_may_access(task, PTRACE_MODE_READ) < 0)
263 up_read(&mm->mmap_sem);
268 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
272 struct mm_struct *mm = get_task_mm(task);
276 goto out_mm; /* Shh! No looking before we're done */
278 len = mm->arg_end - mm->arg_start;
283 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
285 // If the nul at the end of args has been overwritten, then
286 // assume application is using setproctitle(3).
287 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
288 len = strnlen(buffer, res);
292 len = mm->env_end - mm->env_start;
293 if (len > PAGE_SIZE - res)
294 len = PAGE_SIZE - res;
295 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
296 res = strnlen(buffer, res);
305 static int proc_pid_auxv(struct task_struct *task, char *buffer)
308 struct mm_struct *mm = get_task_mm(task);
310 unsigned int nwords = 0;
313 while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
314 res = nwords * sizeof(mm->saved_auxv[0]);
317 memcpy(buffer, mm->saved_auxv, res);
324 #ifdef CONFIG_KALLSYMS
326 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
327 * Returns the resolved symbol. If that fails, simply return the address.
329 static int proc_pid_wchan(struct task_struct *task, char *buffer)
332 char symname[KSYM_NAME_LEN];
334 wchan = get_wchan(task);
336 if (lookup_symbol_name(wchan, symname) < 0)
337 return sprintf(buffer, "%lu", wchan);
339 return sprintf(buffer, "%s", symname);
341 #endif /* CONFIG_KALLSYMS */
343 #ifdef CONFIG_SCHEDSTATS
345 * Provides /proc/PID/schedstat
347 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
349 return sprintf(buffer, "%llu %llu %lu\n",
350 (unsigned long long)task->se.sum_exec_runtime,
351 (unsigned long long)task->sched_info.run_delay,
352 task->sched_info.pcount);
356 #ifdef CONFIG_LATENCYTOP
357 static int lstats_show_proc(struct seq_file *m, void *v)
360 struct inode *inode = m->private;
361 struct task_struct *task = get_proc_task(inode);
365 seq_puts(m, "Latency Top version : v0.1\n");
366 for (i = 0; i < 32; i++) {
367 if (task->latency_record[i].backtrace[0]) {
369 seq_printf(m, "%i %li %li ",
370 task->latency_record[i].count,
371 task->latency_record[i].time,
372 task->latency_record[i].max);
373 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
374 char sym[KSYM_SYMBOL_LEN];
376 if (!task->latency_record[i].backtrace[q])
378 if (task->latency_record[i].backtrace[q] == ULONG_MAX)
380 sprint_symbol(sym, task->latency_record[i].backtrace[q]);
381 c = strchr(sym, '+');
384 seq_printf(m, "%s ", sym);
390 put_task_struct(task);
394 static int lstats_open(struct inode *inode, struct file *file)
396 return single_open(file, lstats_show_proc, inode);
399 static ssize_t lstats_write(struct file *file, const char __user *buf,
400 size_t count, loff_t *offs)
402 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
406 clear_all_latency_tracing(task);
407 put_task_struct(task);
412 static const struct file_operations proc_lstats_operations = {
415 .write = lstats_write,
417 .release = single_release,
422 /* The badness from the OOM killer */
423 unsigned long badness(struct task_struct *p, unsigned long uptime);
424 static int proc_oom_score(struct task_struct *task, char *buffer)
426 unsigned long points;
427 struct timespec uptime;
429 do_posix_clock_monotonic_gettime(&uptime);
430 read_lock(&tasklist_lock);
431 points = badness(task, uptime.tv_sec);
432 read_unlock(&tasklist_lock);
433 return sprintf(buffer, "%lu\n", points);
441 static const struct limit_names lnames[RLIM_NLIMITS] = {
442 [RLIMIT_CPU] = {"Max cpu time", "ms"},
443 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
444 [RLIMIT_DATA] = {"Max data size", "bytes"},
445 [RLIMIT_STACK] = {"Max stack size", "bytes"},
446 [RLIMIT_CORE] = {"Max core file size", "bytes"},
447 [RLIMIT_RSS] = {"Max resident set", "bytes"},
448 [RLIMIT_NPROC] = {"Max processes", "processes"},
449 [RLIMIT_NOFILE] = {"Max open files", "files"},
450 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
451 [RLIMIT_AS] = {"Max address space", "bytes"},
452 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
453 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
454 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
455 [RLIMIT_NICE] = {"Max nice priority", NULL},
456 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
457 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
460 /* Display limits for a process */
461 static int proc_pid_limits(struct task_struct *task, char *buffer)
466 char *bufptr = buffer;
468 struct rlimit rlim[RLIM_NLIMITS];
470 if (!lock_task_sighand(task, &flags))
472 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
473 unlock_task_sighand(task, &flags);
476 * print the file header
478 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
479 "Limit", "Soft Limit", "Hard Limit", "Units");
481 for (i = 0; i < RLIM_NLIMITS; i++) {
482 if (rlim[i].rlim_cur == RLIM_INFINITY)
483 count += sprintf(&bufptr[count], "%-25s %-20s ",
484 lnames[i].name, "unlimited");
486 count += sprintf(&bufptr[count], "%-25s %-20lu ",
487 lnames[i].name, rlim[i].rlim_cur);
489 if (rlim[i].rlim_max == RLIM_INFINITY)
490 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
492 count += sprintf(&bufptr[count], "%-20lu ",
496 count += sprintf(&bufptr[count], "%-10s\n",
499 count += sprintf(&bufptr[count], "\n");
505 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
506 static int proc_pid_syscall(struct task_struct *task, char *buffer)
509 unsigned long args[6], sp, pc;
511 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
512 return sprintf(buffer, "running\n");
515 return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
517 return sprintf(buffer,
518 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
520 args[0], args[1], args[2], args[3], args[4], args[5],
523 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
525 /************************************************************************/
526 /* Here the fs part begins */
527 /************************************************************************/
529 /* permission checks */
530 static int proc_fd_access_allowed(struct inode *inode)
532 struct task_struct *task;
534 /* Allow access to a task's file descriptors if it is us or we
535 * may use ptrace attach to the process and find out that
538 task = get_proc_task(inode);
540 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
541 put_task_struct(task);
546 static int proc_setattr(struct dentry *dentry, struct iattr *attr)
549 struct inode *inode = dentry->d_inode;
551 if (attr->ia_valid & ATTR_MODE)
554 error = inode_change_ok(inode, attr);
556 error = inode_setattr(inode, attr);
560 static const struct inode_operations proc_def_inode_operations = {
561 .setattr = proc_setattr,
564 static int mounts_open_common(struct inode *inode, struct file *file,
565 const struct seq_operations *op)
567 struct task_struct *task = get_proc_task(inode);
569 struct mnt_namespace *ns = NULL;
570 struct fs_struct *fs = NULL;
572 struct proc_mounts *p;
577 nsp = task_nsproxy(task);
585 fs = get_fs_struct(task);
586 put_task_struct(task);
594 read_lock(&fs->lock);
597 read_unlock(&fs->lock);
601 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
605 file->private_data = &p->m;
606 ret = seq_open(file, op);
613 p->event = ns->event;
627 static int mounts_release(struct inode *inode, struct file *file)
629 struct proc_mounts *p = file->private_data;
632 return seq_release(inode, file);
635 static unsigned mounts_poll(struct file *file, poll_table *wait)
637 struct proc_mounts *p = file->private_data;
638 struct mnt_namespace *ns = p->ns;
641 poll_wait(file, &ns->poll, wait);
643 spin_lock(&vfsmount_lock);
644 if (p->event != ns->event) {
645 p->event = ns->event;
648 spin_unlock(&vfsmount_lock);
653 static int mounts_open(struct inode *inode, struct file *file)
655 return mounts_open_common(inode, file, &mounts_op);
658 static const struct file_operations proc_mounts_operations = {
662 .release = mounts_release,
666 static int mountinfo_open(struct inode *inode, struct file *file)
668 return mounts_open_common(inode, file, &mountinfo_op);
671 static const struct file_operations proc_mountinfo_operations = {
672 .open = mountinfo_open,
675 .release = mounts_release,
679 static int mountstats_open(struct inode *inode, struct file *file)
681 return mounts_open_common(inode, file, &mountstats_op);
684 static const struct file_operations proc_mountstats_operations = {
685 .open = mountstats_open,
688 .release = mounts_release,
691 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
693 static ssize_t proc_info_read(struct file * file, char __user * buf,
694 size_t count, loff_t *ppos)
696 struct inode * inode = file->f_path.dentry->d_inode;
699 struct task_struct *task = get_proc_task(inode);
705 if (count > PROC_BLOCK_SIZE)
706 count = PROC_BLOCK_SIZE;
709 if (!(page = __get_free_page(GFP_TEMPORARY)))
712 length = PROC_I(inode)->op.proc_read(task, (char*)page);
715 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
718 put_task_struct(task);
723 static const struct file_operations proc_info_file_operations = {
724 .read = proc_info_read,
727 static int proc_single_show(struct seq_file *m, void *v)
729 struct inode *inode = m->private;
730 struct pid_namespace *ns;
732 struct task_struct *task;
735 ns = inode->i_sb->s_fs_info;
736 pid = proc_pid(inode);
737 task = get_pid_task(pid, PIDTYPE_PID);
741 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
743 put_task_struct(task);
747 static int proc_single_open(struct inode *inode, struct file *filp)
750 ret = single_open(filp, proc_single_show, NULL);
752 struct seq_file *m = filp->private_data;
759 static const struct file_operations proc_single_file_operations = {
760 .open = proc_single_open,
763 .release = single_release,
766 static int mem_open(struct inode* inode, struct file* file)
768 file->private_data = (void*)((long)current->self_exec_id);
772 static ssize_t mem_read(struct file * file, char __user * buf,
773 size_t count, loff_t *ppos)
775 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
777 unsigned long src = *ppos;
779 struct mm_struct *mm;
784 if (check_mem_permission(task))
788 page = (char *)__get_free_page(GFP_TEMPORARY);
794 mm = get_task_mm(task);
800 if (file->private_data != (void*)((long)current->self_exec_id))
806 int this_len, retval;
808 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
809 retval = access_process_vm(task, src, page, this_len, 0);
810 if (!retval || check_mem_permission(task)) {
816 if (copy_to_user(buf, page, retval)) {
831 free_page((unsigned long) page);
833 put_task_struct(task);
838 #define mem_write NULL
841 /* This is a security hazard */
842 static ssize_t mem_write(struct file * file, const char __user *buf,
843 size_t count, loff_t *ppos)
847 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
848 unsigned long dst = *ppos;
854 if (check_mem_permission(task))
858 page = (char *)__get_free_page(GFP_TEMPORARY);
864 int this_len, retval;
866 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
867 if (copy_from_user(page, buf, this_len)) {
871 retval = access_process_vm(task, dst, page, this_len, 1);
883 free_page((unsigned long) page);
885 put_task_struct(task);
891 loff_t mem_lseek(struct file *file, loff_t offset, int orig)
895 file->f_pos = offset;
898 file->f_pos += offset;
903 force_successful_syscall_return();
907 static const struct file_operations proc_mem_operations = {
914 static ssize_t environ_read(struct file *file, char __user *buf,
915 size_t count, loff_t *ppos)
917 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
919 unsigned long src = *ppos;
921 struct mm_struct *mm;
926 if (!ptrace_may_access(task, PTRACE_MODE_READ))
930 page = (char *)__get_free_page(GFP_TEMPORARY);
936 mm = get_task_mm(task);
941 int this_len, retval, max_len;
943 this_len = mm->env_end - (mm->env_start + src);
948 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
949 this_len = (this_len > max_len) ? max_len : this_len;
951 retval = access_process_vm(task, (mm->env_start + src),
959 if (copy_to_user(buf, page, retval)) {
973 free_page((unsigned long) page);
975 put_task_struct(task);
980 static const struct file_operations proc_environ_operations = {
981 .read = environ_read,
984 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
985 size_t count, loff_t *ppos)
987 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
988 char buffer[PROC_NUMBUF];
994 oom_adjust = task->oomkilladj;
995 put_task_struct(task);
997 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
999 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1002 static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
1003 size_t count, loff_t *ppos)
1005 struct task_struct *task;
1006 char buffer[PROC_NUMBUF], *end;
1009 memset(buffer, 0, sizeof(buffer));
1010 if (count > sizeof(buffer) - 1)
1011 count = sizeof(buffer) - 1;
1012 if (copy_from_user(buffer, buf, count))
1014 oom_adjust = simple_strtol(buffer, &end, 0);
1015 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
1016 oom_adjust != OOM_DISABLE)
1020 task = get_proc_task(file->f_path.dentry->d_inode);
1023 if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) {
1024 put_task_struct(task);
1027 task->oomkilladj = oom_adjust;
1028 put_task_struct(task);
1029 if (end - buffer == 0)
1031 return end - buffer;
1034 static const struct file_operations proc_oom_adjust_operations = {
1035 .read = oom_adjust_read,
1036 .write = oom_adjust_write,
1039 #ifdef CONFIG_AUDITSYSCALL
1040 #define TMPBUFLEN 21
1041 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1042 size_t count, loff_t *ppos)
1044 struct inode * inode = file->f_path.dentry->d_inode;
1045 struct task_struct *task = get_proc_task(inode);
1047 char tmpbuf[TMPBUFLEN];
1051 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1052 audit_get_loginuid(task));
1053 put_task_struct(task);
1054 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1057 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1058 size_t count, loff_t *ppos)
1060 struct inode * inode = file->f_path.dentry->d_inode;
1065 if (!capable(CAP_AUDIT_CONTROL))
1068 if (current != pid_task(proc_pid(inode), PIDTYPE_PID))
1071 if (count >= PAGE_SIZE)
1072 count = PAGE_SIZE - 1;
1075 /* No partial writes. */
1078 page = (char*)__get_free_page(GFP_TEMPORARY);
1082 if (copy_from_user(page, buf, count))
1086 loginuid = simple_strtoul(page, &tmp, 10);
1092 length = audit_set_loginuid(current, loginuid);
1093 if (likely(length == 0))
1097 free_page((unsigned long) page);
1101 static const struct file_operations proc_loginuid_operations = {
1102 .read = proc_loginuid_read,
1103 .write = proc_loginuid_write,
1106 static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1107 size_t count, loff_t *ppos)
1109 struct inode * inode = file->f_path.dentry->d_inode;
1110 struct task_struct *task = get_proc_task(inode);
1112 char tmpbuf[TMPBUFLEN];
1116 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1117 audit_get_sessionid(task));
1118 put_task_struct(task);
1119 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1122 static const struct file_operations proc_sessionid_operations = {
1123 .read = proc_sessionid_read,
1127 #ifdef CONFIG_FAULT_INJECTION
1128 static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1129 size_t count, loff_t *ppos)
1131 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1132 char buffer[PROC_NUMBUF];
1138 make_it_fail = task->make_it_fail;
1139 put_task_struct(task);
1141 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
1143 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1146 static ssize_t proc_fault_inject_write(struct file * file,
1147 const char __user * buf, size_t count, loff_t *ppos)
1149 struct task_struct *task;
1150 char buffer[PROC_NUMBUF], *end;
1153 if (!capable(CAP_SYS_RESOURCE))
1155 memset(buffer, 0, sizeof(buffer));
1156 if (count > sizeof(buffer) - 1)
1157 count = sizeof(buffer) - 1;
1158 if (copy_from_user(buffer, buf, count))
1160 make_it_fail = simple_strtol(buffer, &end, 0);
1163 task = get_proc_task(file->f_dentry->d_inode);
1166 task->make_it_fail = make_it_fail;
1167 put_task_struct(task);
1168 if (end - buffer == 0)
1170 return end - buffer;
1173 static const struct file_operations proc_fault_inject_operations = {
1174 .read = proc_fault_inject_read,
1175 .write = proc_fault_inject_write,
1180 #ifdef CONFIG_SCHED_DEBUG
1182 * Print out various scheduling related per-task fields:
1184 static int sched_show(struct seq_file *m, void *v)
1186 struct inode *inode = m->private;
1187 struct task_struct *p;
1191 p = get_proc_task(inode);
1194 proc_sched_show_task(p, m);
1202 sched_write(struct file *file, const char __user *buf,
1203 size_t count, loff_t *offset)
1205 struct inode *inode = file->f_path.dentry->d_inode;
1206 struct task_struct *p;
1210 p = get_proc_task(inode);
1213 proc_sched_set_task(p);
1220 static int sched_open(struct inode *inode, struct file *filp)
1224 ret = single_open(filp, sched_show, NULL);
1226 struct seq_file *m = filp->private_data;
1233 static const struct file_operations proc_pid_sched_operations = {
1236 .write = sched_write,
1237 .llseek = seq_lseek,
1238 .release = single_release,
1244 * We added or removed a vma mapping the executable. The vmas are only mapped
1245 * during exec and are not mapped with the mmap system call.
1246 * Callers must hold down_write() on the mm's mmap_sem for these
1248 void added_exe_file_vma(struct mm_struct *mm)
1250 mm->num_exe_file_vmas++;
1253 void removed_exe_file_vma(struct mm_struct *mm)
1255 mm->num_exe_file_vmas--;
1256 if ((mm->num_exe_file_vmas == 0) && mm->exe_file){
1258 mm->exe_file = NULL;
1263 void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
1266 get_file(new_exe_file);
1269 mm->exe_file = new_exe_file;
1270 mm->num_exe_file_vmas = 0;
1273 struct file *get_mm_exe_file(struct mm_struct *mm)
1275 struct file *exe_file;
1277 /* We need mmap_sem to protect against races with removal of
1278 * VM_EXECUTABLE vmas */
1279 down_read(&mm->mmap_sem);
1280 exe_file = mm->exe_file;
1283 up_read(&mm->mmap_sem);
1287 void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm)
1289 /* It's safe to write the exe_file pointer without exe_file_lock because
1290 * this is called during fork when the task is not yet in /proc */
1291 newmm->exe_file = get_mm_exe_file(oldmm);
1294 static int proc_exe_link(struct inode *inode, struct path *exe_path)
1296 struct task_struct *task;
1297 struct mm_struct *mm;
1298 struct file *exe_file;
1300 task = get_proc_task(inode);
1303 mm = get_task_mm(task);
1304 put_task_struct(task);
1307 exe_file = get_mm_exe_file(mm);
1310 *exe_path = exe_file->f_path;
1311 path_get(&exe_file->f_path);
1318 static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1320 struct inode *inode = dentry->d_inode;
1321 int error = -EACCES;
1323 /* We don't need a base pointer in the /proc filesystem */
1324 path_put(&nd->path);
1326 /* Are we allowed to snoop on the tasks file descriptors? */
1327 if (!proc_fd_access_allowed(inode))
1330 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
1331 nd->last_type = LAST_BIND;
1333 return ERR_PTR(error);
1336 static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1338 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
1345 pathname = d_path(path, tmp, PAGE_SIZE);
1346 len = PTR_ERR(pathname);
1347 if (IS_ERR(pathname))
1349 len = tmp + PAGE_SIZE - 1 - pathname;
1353 if (copy_to_user(buffer, pathname, len))
1356 free_page((unsigned long)tmp);
1360 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1362 int error = -EACCES;
1363 struct inode *inode = dentry->d_inode;
1366 /* Are we allowed to snoop on the tasks file descriptors? */
1367 if (!proc_fd_access_allowed(inode))
1370 error = PROC_I(inode)->op.proc_get_link(inode, &path);
1374 error = do_proc_readlink(&path, buffer, buflen);
1380 static const struct inode_operations proc_pid_link_inode_operations = {
1381 .readlink = proc_pid_readlink,
1382 .follow_link = proc_pid_follow_link,
1383 .setattr = proc_setattr,
1387 /* building an inode */
1389 static int task_dumpable(struct task_struct *task)
1392 struct mm_struct *mm;
1397 dumpable = get_dumpable(mm);
1405 static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
1407 struct inode * inode;
1408 struct proc_inode *ei;
1409 const struct cred *cred;
1411 /* We need a new inode */
1413 inode = new_inode(sb);
1419 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1420 inode->i_op = &proc_def_inode_operations;
1423 * grab the reference to task.
1425 ei->pid = get_task_pid(task, PIDTYPE_PID);
1429 if (task_dumpable(task)) {
1431 cred = __task_cred(task);
1432 inode->i_uid = cred->euid;
1433 inode->i_gid = cred->egid;
1436 security_task_to_inode(task, inode);
1446 static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1448 struct inode *inode = dentry->d_inode;
1449 struct task_struct *task;
1450 const struct cred *cred;
1452 generic_fillattr(inode, stat);
1457 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1459 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1460 task_dumpable(task)) {
1461 cred = __task_cred(task);
1462 stat->uid = cred->euid;
1463 stat->gid = cred->egid;
1473 * Exceptional case: normally we are not allowed to unhash a busy
1474 * directory. In this case, however, we can do it - no aliasing problems
1475 * due to the way we treat inodes.
1477 * Rewrite the inode's ownerships here because the owning task may have
1478 * performed a setuid(), etc.
1480 * Before the /proc/pid/status file was created the only way to read
1481 * the effective uid of a /process was to stat /proc/pid. Reading
1482 * /proc/pid/status is slow enough that procps and other packages
1483 * kept stating /proc/pid. To keep the rules in /proc simple I have
1484 * made this apply to all per process world readable and executable
1487 static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1489 struct inode *inode = dentry->d_inode;
1490 struct task_struct *task = get_proc_task(inode);
1491 const struct cred *cred;
1494 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1495 task_dumpable(task)) {
1497 cred = __task_cred(task);
1498 inode->i_uid = cred->euid;
1499 inode->i_gid = cred->egid;
1505 inode->i_mode &= ~(S_ISUID | S_ISGID);
1506 security_task_to_inode(task, inode);
1507 put_task_struct(task);
1514 static int pid_delete_dentry(struct dentry * dentry)
1516 /* Is the task we represent dead?
1517 * If so, then don't put the dentry on the lru list,
1518 * kill it immediately.
1520 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1523 static struct dentry_operations pid_dentry_operations =
1525 .d_revalidate = pid_revalidate,
1526 .d_delete = pid_delete_dentry,
1531 typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
1532 struct task_struct *, const void *);
1535 * Fill a directory entry.
1537 * If possible create the dcache entry and derive our inode number and
1538 * file type from dcache entry.
1540 * Since all of the proc inode numbers are dynamically generated, the inode
1541 * numbers do not exist until the inode is cache. This means creating the
1542 * the dcache entry in readdir is necessary to keep the inode numbers
1543 * reported by readdir in sync with the inode numbers reported
1546 static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1547 char *name, int len,
1548 instantiate_t instantiate, struct task_struct *task, const void *ptr)
1550 struct dentry *child, *dir = filp->f_path.dentry;
1551 struct inode *inode;
1554 unsigned type = DT_UNKNOWN;
1558 qname.hash = full_name_hash(name, len);
1560 child = d_lookup(dir, &qname);
1563 new = d_alloc(dir, &qname);
1565 child = instantiate(dir->d_inode, new, task, ptr);
1572 if (!child || IS_ERR(child) || !child->d_inode)
1573 goto end_instantiate;
1574 inode = child->d_inode;
1577 type = inode->i_mode >> 12;
1582 ino = find_inode_number(dir, &qname);
1585 return filldir(dirent, name, len, filp->f_pos, ino, type);
1588 static unsigned name_to_int(struct dentry *dentry)
1590 const char *name = dentry->d_name.name;
1591 int len = dentry->d_name.len;
1594 if (len > 1 && *name == '0')
1597 unsigned c = *name++ - '0';
1600 if (n >= (~0U-9)/10)
1610 #define PROC_FDINFO_MAX 64
1612 static int proc_fd_info(struct inode *inode, struct path *path, char *info)
1614 struct task_struct *task = get_proc_task(inode);
1615 struct files_struct *files = NULL;
1617 int fd = proc_fd(inode);
1620 files = get_files_struct(task);
1621 put_task_struct(task);
1625 * We are not taking a ref to the file structure, so we must
1628 spin_lock(&files->file_lock);
1629 file = fcheck_files(files, fd);
1632 *path = file->f_path;
1633 path_get(&file->f_path);
1636 snprintf(info, PROC_FDINFO_MAX,
1639 (long long) file->f_pos,
1641 spin_unlock(&files->file_lock);
1642 put_files_struct(files);
1645 spin_unlock(&files->file_lock);
1646 put_files_struct(files);
1651 static int proc_fd_link(struct inode *inode, struct path *path)
1653 return proc_fd_info(inode, path, NULL);
1656 static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1658 struct inode *inode = dentry->d_inode;
1659 struct task_struct *task = get_proc_task(inode);
1660 int fd = proc_fd(inode);
1661 struct files_struct *files;
1662 const struct cred *cred;
1665 files = get_files_struct(task);
1668 if (fcheck_files(files, fd)) {
1670 put_files_struct(files);
1671 if (task_dumpable(task)) {
1673 cred = __task_cred(task);
1674 inode->i_uid = cred->euid;
1675 inode->i_gid = cred->egid;
1681 inode->i_mode &= ~(S_ISUID | S_ISGID);
1682 security_task_to_inode(task, inode);
1683 put_task_struct(task);
1687 put_files_struct(files);
1689 put_task_struct(task);
1695 static struct dentry_operations tid_fd_dentry_operations =
1697 .d_revalidate = tid_fd_revalidate,
1698 .d_delete = pid_delete_dentry,
1701 static struct dentry *proc_fd_instantiate(struct inode *dir,
1702 struct dentry *dentry, struct task_struct *task, const void *ptr)
1704 unsigned fd = *(const unsigned *)ptr;
1706 struct files_struct *files;
1707 struct inode *inode;
1708 struct proc_inode *ei;
1709 struct dentry *error = ERR_PTR(-ENOENT);
1711 inode = proc_pid_make_inode(dir->i_sb, task);
1716 files = get_files_struct(task);
1719 inode->i_mode = S_IFLNK;
1722 * We are not taking a ref to the file structure, so we must
1725 spin_lock(&files->file_lock);
1726 file = fcheck_files(files, fd);
1729 if (file->f_mode & FMODE_READ)
1730 inode->i_mode |= S_IRUSR | S_IXUSR;
1731 if (file->f_mode & FMODE_WRITE)
1732 inode->i_mode |= S_IWUSR | S_IXUSR;
1733 spin_unlock(&files->file_lock);
1734 put_files_struct(files);
1736 inode->i_op = &proc_pid_link_inode_operations;
1738 ei->op.proc_get_link = proc_fd_link;
1739 dentry->d_op = &tid_fd_dentry_operations;
1740 d_add(dentry, inode);
1741 /* Close the race of the process dying before we return the dentry */
1742 if (tid_fd_revalidate(dentry, NULL))
1748 spin_unlock(&files->file_lock);
1749 put_files_struct(files);
1755 static struct dentry *proc_lookupfd_common(struct inode *dir,
1756 struct dentry *dentry,
1757 instantiate_t instantiate)
1759 struct task_struct *task = get_proc_task(dir);
1760 unsigned fd = name_to_int(dentry);
1761 struct dentry *result = ERR_PTR(-ENOENT);
1768 result = instantiate(dir, dentry, task, &fd);
1770 put_task_struct(task);
1775 static int proc_readfd_common(struct file * filp, void * dirent,
1776 filldir_t filldir, instantiate_t instantiate)
1778 struct dentry *dentry = filp->f_path.dentry;
1779 struct inode *inode = dentry->d_inode;
1780 struct task_struct *p = get_proc_task(inode);
1781 unsigned int fd, ino;
1783 struct files_struct * files;
1793 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1797 ino = parent_ino(dentry);
1798 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1802 files = get_files_struct(p);
1806 for (fd = filp->f_pos-2;
1807 fd < files_fdtable(files)->max_fds;
1808 fd++, filp->f_pos++) {
1809 char name[PROC_NUMBUF];
1812 if (!fcheck_files(files, fd))
1816 len = snprintf(name, sizeof(name), "%d", fd);
1817 if (proc_fill_cache(filp, dirent, filldir,
1818 name, len, instantiate,
1826 put_files_struct(files);
1834 static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
1835 struct nameidata *nd)
1837 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
1840 static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
1842 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
1845 static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
1846 size_t len, loff_t *ppos)
1848 char tmp[PROC_FDINFO_MAX];
1849 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
1851 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
1855 static const struct file_operations proc_fdinfo_file_operations = {
1856 .open = nonseekable_open,
1857 .read = proc_fdinfo_read,
1860 static const struct file_operations proc_fd_operations = {
1861 .read = generic_read_dir,
1862 .readdir = proc_readfd,
1866 * /proc/pid/fd needs a special permission handler so that a process can still
1867 * access /proc/self/fd after it has executed a setuid().
1869 static int proc_fd_permission(struct inode *inode, int mask)
1873 rv = generic_permission(inode, mask, NULL);
1876 if (task_pid(current) == proc_pid(inode))
1882 * proc directories can do almost nothing..
1884 static const struct inode_operations proc_fd_inode_operations = {
1885 .lookup = proc_lookupfd,
1886 .permission = proc_fd_permission,
1887 .setattr = proc_setattr,
1890 static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
1891 struct dentry *dentry, struct task_struct *task, const void *ptr)
1893 unsigned fd = *(unsigned *)ptr;
1894 struct inode *inode;
1895 struct proc_inode *ei;
1896 struct dentry *error = ERR_PTR(-ENOENT);
1898 inode = proc_pid_make_inode(dir->i_sb, task);
1903 inode->i_mode = S_IFREG | S_IRUSR;
1904 inode->i_fop = &proc_fdinfo_file_operations;
1905 dentry->d_op = &tid_fd_dentry_operations;
1906 d_add(dentry, inode);
1907 /* Close the race of the process dying before we return the dentry */
1908 if (tid_fd_revalidate(dentry, NULL))
1915 static struct dentry *proc_lookupfdinfo(struct inode *dir,
1916 struct dentry *dentry,
1917 struct nameidata *nd)
1919 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
1922 static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
1924 return proc_readfd_common(filp, dirent, filldir,
1925 proc_fdinfo_instantiate);
1928 static const struct file_operations proc_fdinfo_operations = {
1929 .read = generic_read_dir,
1930 .readdir = proc_readfdinfo,
1934 * proc directories can do almost nothing..
1936 static const struct inode_operations proc_fdinfo_inode_operations = {
1937 .lookup = proc_lookupfdinfo,
1938 .setattr = proc_setattr,
1942 static struct dentry *proc_pident_instantiate(struct inode *dir,
1943 struct dentry *dentry, struct task_struct *task, const void *ptr)
1945 const struct pid_entry *p = ptr;
1946 struct inode *inode;
1947 struct proc_inode *ei;
1948 struct dentry *error = ERR_PTR(-EINVAL);
1950 inode = proc_pid_make_inode(dir->i_sb, task);
1955 inode->i_mode = p->mode;
1956 if (S_ISDIR(inode->i_mode))
1957 inode->i_nlink = 2; /* Use getattr to fix if necessary */
1959 inode->i_op = p->iop;
1961 inode->i_fop = p->fop;
1963 dentry->d_op = &pid_dentry_operations;
1964 d_add(dentry, inode);
1965 /* Close the race of the process dying before we return the dentry */
1966 if (pid_revalidate(dentry, NULL))
1972 static struct dentry *proc_pident_lookup(struct inode *dir,
1973 struct dentry *dentry,
1974 const struct pid_entry *ents,
1977 struct inode *inode;
1978 struct dentry *error;
1979 struct task_struct *task = get_proc_task(dir);
1980 const struct pid_entry *p, *last;
1982 error = ERR_PTR(-ENOENT);
1989 * Yes, it does not scale. And it should not. Don't add
1990 * new entries into /proc/<tgid>/ without very good reasons.
1992 last = &ents[nents - 1];
1993 for (p = ents; p <= last; p++) {
1994 if (p->len != dentry->d_name.len)
1996 if (!memcmp(dentry->d_name.name, p->name, p->len))
2002 error = proc_pident_instantiate(dir, dentry, task, p);
2004 put_task_struct(task);
2009 static int proc_pident_fill_cache(struct file *filp, void *dirent,
2010 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2012 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2013 proc_pident_instantiate, task, p);
2016 static int proc_pident_readdir(struct file *filp,
2017 void *dirent, filldir_t filldir,
2018 const struct pid_entry *ents, unsigned int nents)
2021 struct dentry *dentry = filp->f_path.dentry;
2022 struct inode *inode = dentry->d_inode;
2023 struct task_struct *task = get_proc_task(inode);
2024 const struct pid_entry *p, *last;
2037 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2043 ino = parent_ino(dentry);
2044 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2056 last = &ents[nents - 1];
2058 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
2067 put_task_struct(task);
2072 #ifdef CONFIG_SECURITY
2073 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2074 size_t count, loff_t *ppos)
2076 struct inode * inode = file->f_path.dentry->d_inode;
2079 struct task_struct *task = get_proc_task(inode);
2084 length = security_getprocattr(task,
2085 (char*)file->f_path.dentry->d_name.name,
2087 put_task_struct(task);
2089 length = simple_read_from_buffer(buf, count, ppos, p, length);
2094 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2095 size_t count, loff_t *ppos)
2097 struct inode * inode = file->f_path.dentry->d_inode;
2100 struct task_struct *task = get_proc_task(inode);
2105 if (count > PAGE_SIZE)
2108 /* No partial writes. */
2114 page = (char*)__get_free_page(GFP_TEMPORARY);
2119 if (copy_from_user(page, buf, count))
2122 length = security_setprocattr(task,
2123 (char*)file->f_path.dentry->d_name.name,
2124 (void*)page, count);
2126 free_page((unsigned long) page);
2128 put_task_struct(task);
2133 static const struct file_operations proc_pid_attr_operations = {
2134 .read = proc_pid_attr_read,
2135 .write = proc_pid_attr_write,
2138 static const struct pid_entry attr_dir_stuff[] = {
2139 REG("current", S_IRUGO|S_IWUGO, pid_attr),
2140 REG("prev", S_IRUGO, pid_attr),
2141 REG("exec", S_IRUGO|S_IWUGO, pid_attr),
2142 REG("fscreate", S_IRUGO|S_IWUGO, pid_attr),
2143 REG("keycreate", S_IRUGO|S_IWUGO, pid_attr),
2144 REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr),
2147 static int proc_attr_dir_readdir(struct file * filp,
2148 void * dirent, filldir_t filldir)
2150 return proc_pident_readdir(filp,dirent,filldir,
2151 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
2154 static const struct file_operations proc_attr_dir_operations = {
2155 .read = generic_read_dir,
2156 .readdir = proc_attr_dir_readdir,
2159 static struct dentry *proc_attr_dir_lookup(struct inode *dir,
2160 struct dentry *dentry, struct nameidata *nd)
2162 return proc_pident_lookup(dir, dentry,
2163 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
2166 static const struct inode_operations proc_attr_dir_inode_operations = {
2167 .lookup = proc_attr_dir_lookup,
2168 .getattr = pid_getattr,
2169 .setattr = proc_setattr,
2174 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
2175 static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2176 size_t count, loff_t *ppos)
2178 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2179 struct mm_struct *mm;
2180 char buffer[PROC_NUMBUF];
2188 mm = get_task_mm(task);
2190 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2191 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2192 MMF_DUMP_FILTER_SHIFT));
2194 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2197 put_task_struct(task);
2202 static ssize_t proc_coredump_filter_write(struct file *file,
2203 const char __user *buf,
2207 struct task_struct *task;
2208 struct mm_struct *mm;
2209 char buffer[PROC_NUMBUF], *end;
2216 memset(buffer, 0, sizeof(buffer));
2217 if (count > sizeof(buffer) - 1)
2218 count = sizeof(buffer) - 1;
2219 if (copy_from_user(buffer, buf, count))
2223 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2226 if (end - buffer == 0)
2230 task = get_proc_task(file->f_dentry->d_inode);
2235 mm = get_task_mm(task);
2239 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2241 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2243 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2248 put_task_struct(task);
2253 static const struct file_operations proc_coredump_filter_operations = {
2254 .read = proc_coredump_filter_read,
2255 .write = proc_coredump_filter_write,
2262 static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2265 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2266 pid_t tgid = task_tgid_nr_ns(current, ns);
2267 char tmp[PROC_NUMBUF];
2270 sprintf(tmp, "%d", tgid);
2271 return vfs_readlink(dentry,buffer,buflen,tmp);
2274 static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2276 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2277 pid_t tgid = task_tgid_nr_ns(current, ns);
2278 char tmp[PROC_NUMBUF];
2280 return ERR_PTR(-ENOENT);
2281 sprintf(tmp, "%d", task_tgid_nr_ns(current, ns));
2282 return ERR_PTR(vfs_follow_link(nd,tmp));
2285 static const struct inode_operations proc_self_inode_operations = {
2286 .readlink = proc_self_readlink,
2287 .follow_link = proc_self_follow_link,
2293 * These are the directory entries in the root directory of /proc
2294 * that properly belong to the /proc filesystem, as they describe
2295 * describe something that is process related.
2297 static const struct pid_entry proc_base_stuff[] = {
2298 NOD("self", S_IFLNK|S_IRWXUGO,
2299 &proc_self_inode_operations, NULL, {}),
2303 * Exceptional case: normally we are not allowed to unhash a busy
2304 * directory. In this case, however, we can do it - no aliasing problems
2305 * due to the way we treat inodes.
2307 static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd)
2309 struct inode *inode = dentry->d_inode;
2310 struct task_struct *task = get_proc_task(inode);
2312 put_task_struct(task);
2319 static struct dentry_operations proc_base_dentry_operations =
2321 .d_revalidate = proc_base_revalidate,
2322 .d_delete = pid_delete_dentry,
2325 static struct dentry *proc_base_instantiate(struct inode *dir,
2326 struct dentry *dentry, struct task_struct *task, const void *ptr)
2328 const struct pid_entry *p = ptr;
2329 struct inode *inode;
2330 struct proc_inode *ei;
2331 struct dentry *error = ERR_PTR(-EINVAL);
2333 /* Allocate the inode */
2334 error = ERR_PTR(-ENOMEM);
2335 inode = new_inode(dir->i_sb);
2339 /* Initialize the inode */
2341 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
2344 * grab the reference to the task.
2346 ei->pid = get_task_pid(task, PIDTYPE_PID);
2350 inode->i_mode = p->mode;
2351 if (S_ISDIR(inode->i_mode))
2353 if (S_ISLNK(inode->i_mode))
2356 inode->i_op = p->iop;
2358 inode->i_fop = p->fop;
2360 dentry->d_op = &proc_base_dentry_operations;
2361 d_add(dentry, inode);
2370 static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2372 struct dentry *error;
2373 struct task_struct *task = get_proc_task(dir);
2374 const struct pid_entry *p, *last;
2376 error = ERR_PTR(-ENOENT);
2381 /* Lookup the directory entry */
2382 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2383 for (p = proc_base_stuff; p <= last; p++) {
2384 if (p->len != dentry->d_name.len)
2386 if (!memcmp(dentry->d_name.name, p->name, p->len))
2392 error = proc_base_instantiate(dir, dentry, task, p);
2395 put_task_struct(task);
2400 static int proc_base_fill_cache(struct file *filp, void *dirent,
2401 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2403 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2404 proc_base_instantiate, task, p);
2407 #ifdef CONFIG_TASK_IO_ACCOUNTING
2408 static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2410 struct task_io_accounting acct = task->ioac;
2411 unsigned long flags;
2413 if (whole && lock_task_sighand(task, &flags)) {
2414 struct task_struct *t = task;
2416 task_io_accounting_add(&acct, &task->signal->ioac);
2417 while_each_thread(task, t)
2418 task_io_accounting_add(&acct, &t->ioac);
2420 unlock_task_sighand(task, &flags);
2422 return sprintf(buffer,
2427 "read_bytes: %llu\n"
2428 "write_bytes: %llu\n"
2429 "cancelled_write_bytes: %llu\n",
2430 (unsigned long long)acct.rchar,
2431 (unsigned long long)acct.wchar,
2432 (unsigned long long)acct.syscr,
2433 (unsigned long long)acct.syscw,
2434 (unsigned long long)acct.read_bytes,
2435 (unsigned long long)acct.write_bytes,
2436 (unsigned long long)acct.cancelled_write_bytes);
2439 static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2441 return do_io_accounting(task, buffer, 0);
2444 static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2446 return do_io_accounting(task, buffer, 1);
2448 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2450 static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2451 struct pid *pid, struct task_struct *task)
2453 seq_printf(m, "%08x\n", task->personality);
2460 static const struct file_operations proc_task_operations;
2461 static const struct inode_operations proc_task_inode_operations;
2463 static const struct pid_entry tgid_base_stuff[] = {
2464 DIR("task", S_IRUGO|S_IXUGO, task),
2465 DIR("fd", S_IRUSR|S_IXUSR, fd),
2466 DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo),
2468 DIR("net", S_IRUGO|S_IXUGO, net),
2470 REG("environ", S_IRUSR, environ),
2471 INF("auxv", S_IRUSR, pid_auxv),
2472 ONE("status", S_IRUGO, pid_status),
2473 ONE("personality", S_IRUSR, pid_personality),
2474 INF("limits", S_IRUSR, pid_limits),
2475 #ifdef CONFIG_SCHED_DEBUG
2476 REG("sched", S_IRUGO|S_IWUSR, pid_sched),
2478 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2479 INF("syscall", S_IRUSR, pid_syscall),
2481 INF("cmdline", S_IRUGO, pid_cmdline),
2482 ONE("stat", S_IRUGO, tgid_stat),
2483 ONE("statm", S_IRUGO, pid_statm),
2484 REG("maps", S_IRUGO, maps),
2486 REG("numa_maps", S_IRUGO, numa_maps),
2488 REG("mem", S_IRUSR|S_IWUSR, mem),
2492 REG("mounts", S_IRUGO, mounts),
2493 REG("mountinfo", S_IRUGO, mountinfo),
2494 REG("mountstats", S_IRUSR, mountstats),
2495 #ifdef CONFIG_PROC_PAGE_MONITOR
2496 REG("clear_refs", S_IWUSR, clear_refs),
2497 REG("smaps", S_IRUGO, smaps),
2498 REG("pagemap", S_IRUSR, pagemap),
2500 #ifdef CONFIG_SECURITY
2501 DIR("attr", S_IRUGO|S_IXUGO, attr_dir),
2503 #ifdef CONFIG_KALLSYMS
2504 INF("wchan", S_IRUGO, pid_wchan),
2506 #ifdef CONFIG_SCHEDSTATS
2507 INF("schedstat", S_IRUGO, pid_schedstat),
2509 #ifdef CONFIG_LATENCYTOP
2510 REG("latency", S_IRUGO, lstats),
2512 #ifdef CONFIG_PROC_PID_CPUSET
2513 REG("cpuset", S_IRUGO, cpuset),
2515 #ifdef CONFIG_CGROUPS
2516 REG("cgroup", S_IRUGO, cgroup),
2518 INF("oom_score", S_IRUGO, oom_score),
2519 REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust),
2520 #ifdef CONFIG_AUDITSYSCALL
2521 REG("loginuid", S_IWUSR|S_IRUGO, loginuid),
2522 REG("sessionid", S_IRUGO, sessionid),
2524 #ifdef CONFIG_FAULT_INJECTION
2525 REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject),
2527 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
2528 REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter),
2530 #ifdef CONFIG_TASK_IO_ACCOUNTING
2531 INF("io", S_IRUGO, tgid_io_accounting),
2535 static int proc_tgid_base_readdir(struct file * filp,
2536 void * dirent, filldir_t filldir)
2538 return proc_pident_readdir(filp,dirent,filldir,
2539 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
2542 static const struct file_operations proc_tgid_base_operations = {
2543 .read = generic_read_dir,
2544 .readdir = proc_tgid_base_readdir,
2547 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
2548 return proc_pident_lookup(dir, dentry,
2549 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
2552 static const struct inode_operations proc_tgid_base_inode_operations = {
2553 .lookup = proc_tgid_base_lookup,
2554 .getattr = pid_getattr,
2555 .setattr = proc_setattr,
2558 static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
2560 struct dentry *dentry, *leader, *dir;
2561 char buf[PROC_NUMBUF];
2565 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2566 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
2568 if (!(current->flags & PF_EXITING))
2569 shrink_dcache_parent(dentry);
2578 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2579 leader = d_hash_and_lookup(mnt->mnt_root, &name);
2584 name.len = strlen(name.name);
2585 dir = d_hash_and_lookup(leader, &name);
2587 goto out_put_leader;
2590 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2591 dentry = d_hash_and_lookup(dir, &name);
2593 shrink_dcache_parent(dentry);
2606 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2607 * @task: task that should be flushed.
2609 * When flushing dentries from proc, one needs to flush them from global
2610 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2611 * in. This call is supposed to do all of this job.
2613 * Looks in the dcache for
2615 * /proc/@tgid/task/@pid
2616 * if either directory is present flushes it and all of it'ts children
2619 * It is safe and reasonable to cache /proc entries for a task until
2620 * that task exits. After that they just clog up the dcache with
2621 * useless entries, possibly causing useful dcache entries to be
2622 * flushed instead. This routine is proved to flush those useless
2623 * dcache entries at process exit time.
2625 * NOTE: This routine is just an optimization so it does not guarantee
2626 * that no dcache entries will exist at process exit time it
2627 * just makes it very unlikely that any will persist.
2630 void proc_flush_task(struct task_struct *task)
2633 struct pid *pid, *tgid = NULL;
2636 pid = task_pid(task);
2637 if (thread_group_leader(task))
2638 tgid = task_tgid(task);
2640 for (i = 0; i <= pid->level; i++) {
2641 upid = &pid->numbers[i];
2642 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
2643 tgid ? tgid->numbers[i].nr : 0);
2646 upid = &pid->numbers[pid->level];
2648 pid_ns_release_proc(upid->ns);
2651 static struct dentry *proc_pid_instantiate(struct inode *dir,
2652 struct dentry * dentry,
2653 struct task_struct *task, const void *ptr)
2655 struct dentry *error = ERR_PTR(-ENOENT);
2656 struct inode *inode;
2658 inode = proc_pid_make_inode(dir->i_sb, task);
2662 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2663 inode->i_op = &proc_tgid_base_inode_operations;
2664 inode->i_fop = &proc_tgid_base_operations;
2665 inode->i_flags|=S_IMMUTABLE;
2667 inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
2668 ARRAY_SIZE(tgid_base_stuff));
2670 dentry->d_op = &pid_dentry_operations;
2672 d_add(dentry, inode);
2673 /* Close the race of the process dying before we return the dentry */
2674 if (pid_revalidate(dentry, NULL))
2680 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2682 struct dentry *result = ERR_PTR(-ENOENT);
2683 struct task_struct *task;
2685 struct pid_namespace *ns;
2687 result = proc_base_lookup(dir, dentry);
2688 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
2691 tgid = name_to_int(dentry);
2695 ns = dentry->d_sb->s_fs_info;
2697 task = find_task_by_pid_ns(tgid, ns);
2699 get_task_struct(task);
2704 result = proc_pid_instantiate(dir, dentry, task, NULL);
2705 put_task_struct(task);
2711 * Find the first task with tgid >= tgid
2716 struct task_struct *task;
2718 static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
2723 put_task_struct(iter.task);
2727 pid = find_ge_pid(iter.tgid, ns);
2729 iter.tgid = pid_nr_ns(pid, ns);
2730 iter.task = pid_task(pid, PIDTYPE_PID);
2731 /* What we to know is if the pid we have find is the
2732 * pid of a thread_group_leader. Testing for task
2733 * being a thread_group_leader is the obvious thing
2734 * todo but there is a window when it fails, due to
2735 * the pid transfer logic in de_thread.
2737 * So we perform the straight forward test of seeing
2738 * if the pid we have found is the pid of a thread
2739 * group leader, and don't worry if the task we have
2740 * found doesn't happen to be a thread group leader.
2741 * As we don't care in the case of readdir.
2743 if (!iter.task || !has_group_leader_pid(iter.task)) {
2747 get_task_struct(iter.task);
2753 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
2755 static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
2756 struct tgid_iter iter)
2758 char name[PROC_NUMBUF];
2759 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
2760 return proc_fill_cache(filp, dirent, filldir, name, len,
2761 proc_pid_instantiate, iter.task, NULL);
2764 /* for the /proc/ directory itself, after non-process stuff has been done */
2765 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2767 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
2768 struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode);
2769 struct tgid_iter iter;
2770 struct pid_namespace *ns;
2775 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
2776 const struct pid_entry *p = &proc_base_stuff[nr];
2777 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
2781 ns = filp->f_dentry->d_sb->s_fs_info;
2783 iter.tgid = filp->f_pos - TGID_OFFSET;
2784 for (iter = next_tgid(ns, iter);
2786 iter.tgid += 1, iter = next_tgid(ns, iter)) {
2787 filp->f_pos = iter.tgid + TGID_OFFSET;
2788 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
2789 put_task_struct(iter.task);
2793 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
2795 put_task_struct(reaper);
2803 static const struct pid_entry tid_base_stuff[] = {
2804 DIR("fd", S_IRUSR|S_IXUSR, fd),
2805 DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo),
2806 REG("environ", S_IRUSR, environ),
2807 INF("auxv", S_IRUSR, pid_auxv),
2808 ONE("status", S_IRUGO, pid_status),
2809 ONE("personality", S_IRUSR, pid_personality),
2810 INF("limits", S_IRUSR, pid_limits),
2811 #ifdef CONFIG_SCHED_DEBUG
2812 REG("sched", S_IRUGO|S_IWUSR, pid_sched),
2814 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2815 INF("syscall", S_IRUSR, pid_syscall),
2817 INF("cmdline", S_IRUGO, pid_cmdline),
2818 ONE("stat", S_IRUGO, tid_stat),
2819 ONE("statm", S_IRUGO, pid_statm),
2820 REG("maps", S_IRUGO, maps),
2822 REG("numa_maps", S_IRUGO, numa_maps),
2824 REG("mem", S_IRUSR|S_IWUSR, mem),
2828 REG("mounts", S_IRUGO, mounts),
2829 REG("mountinfo", S_IRUGO, mountinfo),
2830 #ifdef CONFIG_PROC_PAGE_MONITOR
2831 REG("clear_refs", S_IWUSR, clear_refs),
2832 REG("smaps", S_IRUGO, smaps),
2833 REG("pagemap", S_IRUSR, pagemap),
2835 #ifdef CONFIG_SECURITY
2836 DIR("attr", S_IRUGO|S_IXUGO, attr_dir),
2838 #ifdef CONFIG_KALLSYMS
2839 INF("wchan", S_IRUGO, pid_wchan),
2841 #ifdef CONFIG_SCHEDSTATS
2842 INF("schedstat", S_IRUGO, pid_schedstat),
2844 #ifdef CONFIG_LATENCYTOP
2845 REG("latency", S_IRUGO, lstats),
2847 #ifdef CONFIG_PROC_PID_CPUSET
2848 REG("cpuset", S_IRUGO, cpuset),
2850 #ifdef CONFIG_CGROUPS
2851 REG("cgroup", S_IRUGO, cgroup),
2853 INF("oom_score", S_IRUGO, oom_score),
2854 REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust),
2855 #ifdef CONFIG_AUDITSYSCALL
2856 REG("loginuid", S_IWUSR|S_IRUGO, loginuid),
2857 REG("sessionid", S_IRUSR, sessionid),
2859 #ifdef CONFIG_FAULT_INJECTION
2860 REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject),
2862 #ifdef CONFIG_TASK_IO_ACCOUNTING
2863 INF("io", S_IRUGO, tid_io_accounting),
2867 static int proc_tid_base_readdir(struct file * filp,
2868 void * dirent, filldir_t filldir)
2870 return proc_pident_readdir(filp,dirent,filldir,
2871 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
2874 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
2875 return proc_pident_lookup(dir, dentry,
2876 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
2879 static const struct file_operations proc_tid_base_operations = {
2880 .read = generic_read_dir,
2881 .readdir = proc_tid_base_readdir,
2884 static const struct inode_operations proc_tid_base_inode_operations = {
2885 .lookup = proc_tid_base_lookup,
2886 .getattr = pid_getattr,
2887 .setattr = proc_setattr,
2890 static struct dentry *proc_task_instantiate(struct inode *dir,
2891 struct dentry *dentry, struct task_struct *task, const void *ptr)
2893 struct dentry *error = ERR_PTR(-ENOENT);
2894 struct inode *inode;
2895 inode = proc_pid_make_inode(dir->i_sb, task);
2899 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2900 inode->i_op = &proc_tid_base_inode_operations;
2901 inode->i_fop = &proc_tid_base_operations;
2902 inode->i_flags|=S_IMMUTABLE;
2904 inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
2905 ARRAY_SIZE(tid_base_stuff));
2907 dentry->d_op = &pid_dentry_operations;
2909 d_add(dentry, inode);
2910 /* Close the race of the process dying before we return the dentry */
2911 if (pid_revalidate(dentry, NULL))
2917 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2919 struct dentry *result = ERR_PTR(-ENOENT);
2920 struct task_struct *task;
2921 struct task_struct *leader = get_proc_task(dir);
2923 struct pid_namespace *ns;
2928 tid = name_to_int(dentry);
2932 ns = dentry->d_sb->s_fs_info;
2934 task = find_task_by_pid_ns(tid, ns);
2936 get_task_struct(task);
2940 if (!same_thread_group(leader, task))
2943 result = proc_task_instantiate(dir, dentry, task, NULL);
2945 put_task_struct(task);
2947 put_task_struct(leader);
2953 * Find the first tid of a thread group to return to user space.
2955 * Usually this is just the thread group leader, but if the users
2956 * buffer was too small or there was a seek into the middle of the
2957 * directory we have more work todo.
2959 * In the case of a short read we start with find_task_by_pid.
2961 * In the case of a seek we start with the leader and walk nr
2964 static struct task_struct *first_tid(struct task_struct *leader,
2965 int tid, int nr, struct pid_namespace *ns)
2967 struct task_struct *pos;
2970 /* Attempt to start with the pid of a thread */
2971 if (tid && (nr > 0)) {
2972 pos = find_task_by_pid_ns(tid, ns);
2973 if (pos && (pos->group_leader == leader))
2977 /* If nr exceeds the number of threads there is nothing todo */
2979 if (nr && nr >= get_nr_threads(leader))
2982 /* If we haven't found our starting place yet start
2983 * with the leader and walk nr threads forward.
2985 for (pos = leader; nr > 0; --nr) {
2986 pos = next_thread(pos);
2987 if (pos == leader) {
2993 get_task_struct(pos);
3000 * Find the next thread in the thread list.
3001 * Return NULL if there is an error or no next thread.
3003 * The reference to the input task_struct is released.
3005 static struct task_struct *next_tid(struct task_struct *start)
3007 struct task_struct *pos = NULL;
3009 if (pid_alive(start)) {
3010 pos = next_thread(start);
3011 if (thread_group_leader(pos))
3014 get_task_struct(pos);
3017 put_task_struct(start);
3021 static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3022 struct task_struct *task, int tid)
3024 char name[PROC_NUMBUF];
3025 int len = snprintf(name, sizeof(name), "%d", tid);
3026 return proc_fill_cache(filp, dirent, filldir, name, len,
3027 proc_task_instantiate, task, NULL);
3030 /* for the /proc/TGID/task/ directories */
3031 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3033 struct dentry *dentry = filp->f_path.dentry;
3034 struct inode *inode = dentry->d_inode;
3035 struct task_struct *leader = NULL;
3036 struct task_struct *task;
3037 int retval = -ENOENT;
3040 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
3041 struct pid_namespace *ns;
3043 task = get_proc_task(inode);
3047 if (pid_alive(task)) {
3048 leader = task->group_leader;
3049 get_task_struct(leader);
3052 put_task_struct(task);
3060 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
3065 ino = parent_ino(dentry);
3066 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
3072 /* f_version caches the tgid value that the last readdir call couldn't
3073 * return. lseek aka telldir automagically resets f_version to 0.
3075 ns = filp->f_dentry->d_sb->s_fs_info;
3076 tid = (int)filp->f_version;
3077 filp->f_version = 0;
3078 for (task = first_tid(leader, tid, pos - 2, ns);
3080 task = next_tid(task), pos++) {
3081 tid = task_pid_nr_ns(task, ns);
3082 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
3083 /* returning this tgid failed, save it as the first
3084 * pid for the next readir call */
3085 filp->f_version = (u64)tid;
3086 put_task_struct(task);
3092 put_task_struct(leader);
3097 static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3099 struct inode *inode = dentry->d_inode;
3100 struct task_struct *p = get_proc_task(inode);
3101 generic_fillattr(inode, stat);
3104 stat->nlink += get_nr_threads(p);
3111 static const struct inode_operations proc_task_inode_operations = {
3112 .lookup = proc_task_lookup,
3113 .getattr = proc_task_getattr,
3114 .setattr = proc_setattr,
3117 static const struct file_operations proc_task_operations = {
3118 .read = generic_read_dir,
3119 .readdir = proc_task_readdir,