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/init.h>
57 #include <linux/capability.h>
58 #include <linux/file.h>
59 #include <linux/string.h>
60 #include <linux/seq_file.h>
61 #include <linux/namei.h>
62 #include <linux/mnt_namespace.h>
64 #include <linux/rcupdate.h>
65 #include <linux/kallsyms.h>
66 #include <linux/resource.h>
67 #include <linux/module.h>
68 #include <linux/mount.h>
69 #include <linux/security.h>
70 #include <linux/ptrace.h>
71 #include <linux/cgroup.h>
72 #include <linux/cpuset.h>
73 #include <linux/audit.h>
74 #include <linux/poll.h>
75 #include <linux/nsproxy.h>
76 #include <linux/oom.h>
77 #include <linux/elf.h>
78 #include <linux/pid_namespace.h>
82 * Implementing inode permission operations in /proc is almost
83 * certainly an error. Permission checks need to happen during
84 * each system call not at open time. The reason is that most of
85 * what we wish to check for permissions in /proc varies at runtime.
87 * The classic example of a problem is opening file descriptors
88 * in /proc for a task before it execs a suid executable.
95 const struct inode_operations
*iop
;
96 const struct file_operations
*fop
;
100 #define NOD(NAME, MODE, IOP, FOP, OP) { \
102 .len = sizeof(NAME) - 1, \
109 #define DIR(NAME, MODE, OTYPE) \
110 NOD(NAME, (S_IFDIR|(MODE)), \
111 &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \
113 #define LNK(NAME, OTYPE) \
114 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
115 &proc_pid_link_inode_operations, NULL, \
116 { .proc_get_link = &proc_##OTYPE##_link } )
117 #define REG(NAME, MODE, OTYPE) \
118 NOD(NAME, (S_IFREG|(MODE)), NULL, \
119 &proc_##OTYPE##_operations, {})
120 #define INF(NAME, MODE, OTYPE) \
121 NOD(NAME, (S_IFREG|(MODE)), \
122 NULL, &proc_info_file_operations, \
123 { .proc_read = &proc_##OTYPE } )
124 #define ONE(NAME, MODE, OTYPE) \
125 NOD(NAME, (S_IFREG|(MODE)), \
126 NULL, &proc_single_file_operations, \
127 { .proc_show = &proc_##OTYPE } )
130 EXPORT_SYMBOL(maps_protect
);
132 static struct fs_struct
*get_fs_struct(struct task_struct
*task
)
134 struct fs_struct
*fs
;
138 atomic_inc(&fs
->count
);
143 static int get_nr_threads(struct task_struct
*tsk
)
145 /* Must be called with the rcu_read_lock held */
149 if (lock_task_sighand(tsk
, &flags
)) {
150 count
= atomic_read(&tsk
->signal
->count
);
151 unlock_task_sighand(tsk
, &flags
);
156 static int proc_cwd_link(struct inode
*inode
, struct path
*path
)
158 struct task_struct
*task
= get_proc_task(inode
);
159 struct fs_struct
*fs
= NULL
;
160 int result
= -ENOENT
;
163 fs
= get_fs_struct(task
);
164 put_task_struct(task
);
167 read_lock(&fs
->lock
);
170 read_unlock(&fs
->lock
);
177 static int proc_root_link(struct inode
*inode
, struct path
*path
)
179 struct task_struct
*task
= get_proc_task(inode
);
180 struct fs_struct
*fs
= NULL
;
181 int result
= -ENOENT
;
184 fs
= get_fs_struct(task
);
185 put_task_struct(task
);
188 read_lock(&fs
->lock
);
191 read_unlock(&fs
->lock
);
198 #define MAY_PTRACE(task) \
199 (task == current || \
200 (task->parent == current && \
201 (task->ptrace & PT_PTRACED) && \
202 (task_is_stopped_or_traced(task)) && \
203 security_ptrace(current,task) == 0))
205 struct mm_struct
*mm_for_maps(struct task_struct
*task
)
207 struct mm_struct
*mm
= get_task_mm(task
);
210 down_read(&mm
->mmap_sem
);
214 if (task
->mm
!= current
->mm
&& __ptrace_may_attach(task
) < 0)
220 up_read(&mm
->mmap_sem
);
225 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
229 struct mm_struct
*mm
= get_task_mm(task
);
233 goto out_mm
; /* Shh! No looking before we're done */
235 len
= mm
->arg_end
- mm
->arg_start
;
240 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
242 // If the nul at the end of args has been overwritten, then
243 // assume application is using setproctitle(3).
244 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
245 len
= strnlen(buffer
, res
);
249 len
= mm
->env_end
- mm
->env_start
;
250 if (len
> PAGE_SIZE
- res
)
251 len
= PAGE_SIZE
- res
;
252 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
253 res
= strnlen(buffer
, res
);
262 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
265 struct mm_struct
*mm
= get_task_mm(task
);
267 unsigned int nwords
= 0;
270 while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
271 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
274 memcpy(buffer
, mm
->saved_auxv
, res
);
281 #ifdef CONFIG_KALLSYMS
283 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
284 * Returns the resolved symbol. If that fails, simply return the address.
286 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
289 char symname
[KSYM_NAME_LEN
];
291 wchan
= get_wchan(task
);
293 if (lookup_symbol_name(wchan
, symname
) < 0)
294 return sprintf(buffer
, "%lu", wchan
);
296 return sprintf(buffer
, "%s", symname
);
298 #endif /* CONFIG_KALLSYMS */
300 #ifdef CONFIG_SCHEDSTATS
302 * Provides /proc/PID/schedstat
304 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
306 return sprintf(buffer
, "%llu %llu %lu\n",
307 task
->sched_info
.cpu_time
,
308 task
->sched_info
.run_delay
,
309 task
->sched_info
.pcount
);
313 #ifdef CONFIG_LATENCYTOP
314 static int lstats_show_proc(struct seq_file
*m
, void *v
)
317 struct task_struct
*task
= m
->private;
318 seq_puts(m
, "Latency Top version : v0.1\n");
320 for (i
= 0; i
< 32; i
++) {
321 if (task
->latency_record
[i
].backtrace
[0]) {
323 seq_printf(m
, "%i %li %li ",
324 task
->latency_record
[i
].count
,
325 task
->latency_record
[i
].time
,
326 task
->latency_record
[i
].max
);
327 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
328 char sym
[KSYM_NAME_LEN
];
330 if (!task
->latency_record
[i
].backtrace
[q
])
332 if (task
->latency_record
[i
].backtrace
[q
] == ULONG_MAX
)
334 sprint_symbol(sym
, task
->latency_record
[i
].backtrace
[q
]);
335 c
= strchr(sym
, '+');
338 seq_printf(m
, "%s ", sym
);
347 static int lstats_open(struct inode
*inode
, struct file
*file
)
351 struct task_struct
*task
= get_proc_task(inode
);
353 ret
= single_open(file
, lstats_show_proc
, NULL
);
355 m
= file
->private_data
;
361 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
362 size_t count
, loff_t
*offs
)
365 struct task_struct
*task
;
367 m
= file
->private_data
;
369 clear_all_latency_tracing(task
);
374 static const struct file_operations proc_lstats_operations
= {
377 .write
= lstats_write
,
379 .release
= single_release
,
384 /* The badness from the OOM killer */
385 unsigned long badness(struct task_struct
*p
, unsigned long uptime
);
386 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
388 unsigned long points
;
389 struct timespec uptime
;
391 do_posix_clock_monotonic_gettime(&uptime
);
392 read_lock(&tasklist_lock
);
393 points
= badness(task
, uptime
.tv_sec
);
394 read_unlock(&tasklist_lock
);
395 return sprintf(buffer
, "%lu\n", points
);
403 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
404 [RLIMIT_CPU
] = {"Max cpu time", "ms"},
405 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
406 [RLIMIT_DATA
] = {"Max data size", "bytes"},
407 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
408 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
409 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
410 [RLIMIT_NPROC
] = {"Max processes", "processes"},
411 [RLIMIT_NOFILE
] = {"Max open files", "files"},
412 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
413 [RLIMIT_AS
] = {"Max address space", "bytes"},
414 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
415 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
416 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
417 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
418 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
419 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
422 /* Display limits for a process */
423 static int proc_pid_limits(struct task_struct
*task
, char *buffer
)
428 char *bufptr
= buffer
;
430 struct rlimit rlim
[RLIM_NLIMITS
];
433 if (!lock_task_sighand(task
,&flags
)) {
437 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
438 unlock_task_sighand(task
, &flags
);
442 * print the file header
444 count
+= sprintf(&bufptr
[count
], "%-25s %-20s %-20s %-10s\n",
445 "Limit", "Soft Limit", "Hard Limit", "Units");
447 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
448 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
449 count
+= sprintf(&bufptr
[count
], "%-25s %-20s ",
450 lnames
[i
].name
, "unlimited");
452 count
+= sprintf(&bufptr
[count
], "%-25s %-20lu ",
453 lnames
[i
].name
, rlim
[i
].rlim_cur
);
455 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
456 count
+= sprintf(&bufptr
[count
], "%-20s ", "unlimited");
458 count
+= sprintf(&bufptr
[count
], "%-20lu ",
462 count
+= sprintf(&bufptr
[count
], "%-10s\n",
465 count
+= sprintf(&bufptr
[count
], "\n");
471 /************************************************************************/
472 /* Here the fs part begins */
473 /************************************************************************/
475 /* permission checks */
476 static int proc_fd_access_allowed(struct inode
*inode
)
478 struct task_struct
*task
;
480 /* Allow access to a task's file descriptors if it is us or we
481 * may use ptrace attach to the process and find out that
484 task
= get_proc_task(inode
);
486 allowed
= ptrace_may_attach(task
);
487 put_task_struct(task
);
492 static int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
495 struct inode
*inode
= dentry
->d_inode
;
497 if (attr
->ia_valid
& ATTR_MODE
)
500 error
= inode_change_ok(inode
, attr
);
502 error
= inode_setattr(inode
, attr
);
506 static const struct inode_operations proc_def_inode_operations
= {
507 .setattr
= proc_setattr
,
510 extern const struct seq_operations mounts_op
;
516 static int mounts_open(struct inode
*inode
, struct file
*file
)
518 struct task_struct
*task
= get_proc_task(inode
);
520 struct mnt_namespace
*ns
= NULL
;
521 struct proc_mounts
*p
;
526 nsp
= task_nsproxy(task
);
534 put_task_struct(task
);
539 p
= kmalloc(sizeof(struct proc_mounts
), GFP_KERNEL
);
541 file
->private_data
= &p
->m
;
542 ret
= seq_open(file
, &mounts_op
);
545 p
->event
= ns
->event
;
555 static int mounts_release(struct inode
*inode
, struct file
*file
)
557 struct seq_file
*m
= file
->private_data
;
558 struct mnt_namespace
*ns
= m
->private;
560 return seq_release(inode
, file
);
563 static unsigned mounts_poll(struct file
*file
, poll_table
*wait
)
565 struct proc_mounts
*p
= file
->private_data
;
566 struct mnt_namespace
*ns
= p
->m
.private;
569 poll_wait(file
, &ns
->poll
, wait
);
571 spin_lock(&vfsmount_lock
);
572 if (p
->event
!= ns
->event
) {
573 p
->event
= ns
->event
;
576 spin_unlock(&vfsmount_lock
);
581 static const struct file_operations proc_mounts_operations
= {
585 .release
= mounts_release
,
589 extern const struct seq_operations mountstats_op
;
590 static int mountstats_open(struct inode
*inode
, struct file
*file
)
592 int ret
= seq_open(file
, &mountstats_op
);
595 struct seq_file
*m
= file
->private_data
;
597 struct mnt_namespace
*mnt_ns
= NULL
;
598 struct task_struct
*task
= get_proc_task(inode
);
602 nsp
= task_nsproxy(task
);
604 mnt_ns
= nsp
->mnt_ns
;
610 put_task_struct(task
);
616 seq_release(inode
, file
);
623 static const struct file_operations proc_mountstats_operations
= {
624 .open
= mountstats_open
,
627 .release
= mounts_release
,
630 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
632 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
633 size_t count
, loff_t
*ppos
)
635 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
638 struct task_struct
*task
= get_proc_task(inode
);
644 if (count
> PROC_BLOCK_SIZE
)
645 count
= PROC_BLOCK_SIZE
;
648 if (!(page
= __get_free_page(GFP_TEMPORARY
)))
651 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
654 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
657 put_task_struct(task
);
662 static const struct file_operations proc_info_file_operations
= {
663 .read
= proc_info_read
,
666 static int proc_single_show(struct seq_file
*m
, void *v
)
668 struct inode
*inode
= m
->private;
669 struct pid_namespace
*ns
;
671 struct task_struct
*task
;
674 ns
= inode
->i_sb
->s_fs_info
;
675 pid
= proc_pid(inode
);
676 task
= get_pid_task(pid
, PIDTYPE_PID
);
680 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
682 put_task_struct(task
);
686 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
689 ret
= single_open(filp
, proc_single_show
, NULL
);
691 struct seq_file
*m
= filp
->private_data
;
698 static const struct file_operations proc_single_file_operations
= {
699 .open
= proc_single_open
,
702 .release
= single_release
,
705 static int mem_open(struct inode
* inode
, struct file
* file
)
707 file
->private_data
= (void*)((long)current
->self_exec_id
);
711 static ssize_t
mem_read(struct file
* file
, char __user
* buf
,
712 size_t count
, loff_t
*ppos
)
714 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
716 unsigned long src
= *ppos
;
718 struct mm_struct
*mm
;
723 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
727 page
= (char *)__get_free_page(GFP_TEMPORARY
);
733 mm
= get_task_mm(task
);
739 if (file
->private_data
!= (void*)((long)current
->self_exec_id
))
745 int this_len
, retval
;
747 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
748 retval
= access_process_vm(task
, src
, page
, this_len
, 0);
749 if (!retval
|| !MAY_PTRACE(task
) || !ptrace_may_attach(task
)) {
755 if (copy_to_user(buf
, page
, retval
)) {
770 free_page((unsigned long) page
);
772 put_task_struct(task
);
777 #define mem_write NULL
780 /* This is a security hazard */
781 static ssize_t
mem_write(struct file
* file
, const char __user
*buf
,
782 size_t count
, loff_t
*ppos
)
786 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
787 unsigned long dst
= *ppos
;
793 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
797 page
= (char *)__get_free_page(GFP_TEMPORARY
);
803 int this_len
, retval
;
805 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
806 if (copy_from_user(page
, buf
, this_len
)) {
810 retval
= access_process_vm(task
, dst
, page
, this_len
, 1);
822 free_page((unsigned long) page
);
824 put_task_struct(task
);
830 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
834 file
->f_pos
= offset
;
837 file
->f_pos
+= offset
;
842 force_successful_syscall_return();
846 static const struct file_operations proc_mem_operations
= {
853 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
854 size_t count
, loff_t
*ppos
)
856 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
858 unsigned long src
= *ppos
;
860 struct mm_struct
*mm
;
865 if (!ptrace_may_attach(task
))
869 page
= (char *)__get_free_page(GFP_TEMPORARY
);
875 mm
= get_task_mm(task
);
880 int this_len
, retval
, max_len
;
882 this_len
= mm
->env_end
- (mm
->env_start
+ src
);
887 max_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
888 this_len
= (this_len
> max_len
) ? max_len
: this_len
;
890 retval
= access_process_vm(task
, (mm
->env_start
+ src
),
898 if (copy_to_user(buf
, page
, retval
)) {
912 free_page((unsigned long) page
);
914 put_task_struct(task
);
919 static const struct file_operations proc_environ_operations
= {
920 .read
= environ_read
,
923 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
924 size_t count
, loff_t
*ppos
)
926 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
927 char buffer
[PROC_NUMBUF
];
933 oom_adjust
= task
->oomkilladj
;
934 put_task_struct(task
);
936 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
938 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
941 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
942 size_t count
, loff_t
*ppos
)
944 struct task_struct
*task
;
945 char buffer
[PROC_NUMBUF
], *end
;
948 memset(buffer
, 0, sizeof(buffer
));
949 if (count
> sizeof(buffer
) - 1)
950 count
= sizeof(buffer
) - 1;
951 if (copy_from_user(buffer
, buf
, count
))
953 oom_adjust
= simple_strtol(buffer
, &end
, 0);
954 if ((oom_adjust
< OOM_ADJUST_MIN
|| oom_adjust
> OOM_ADJUST_MAX
) &&
955 oom_adjust
!= OOM_DISABLE
)
959 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
962 if (oom_adjust
< task
->oomkilladj
&& !capable(CAP_SYS_RESOURCE
)) {
963 put_task_struct(task
);
966 task
->oomkilladj
= oom_adjust
;
967 put_task_struct(task
);
968 if (end
- buffer
== 0)
973 static const struct file_operations proc_oom_adjust_operations
= {
974 .read
= oom_adjust_read
,
975 .write
= oom_adjust_write
,
978 #ifdef CONFIG_AUDITSYSCALL
980 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
981 size_t count
, loff_t
*ppos
)
983 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
984 struct task_struct
*task
= get_proc_task(inode
);
986 char tmpbuf
[TMPBUFLEN
];
990 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
991 audit_get_loginuid(task
));
992 put_task_struct(task
);
993 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
996 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
997 size_t count
, loff_t
*ppos
)
999 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1004 if (!capable(CAP_AUDIT_CONTROL
))
1007 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
))
1010 if (count
>= PAGE_SIZE
)
1011 count
= PAGE_SIZE
- 1;
1014 /* No partial writes. */
1017 page
= (char*)__get_free_page(GFP_TEMPORARY
);
1021 if (copy_from_user(page
, buf
, count
))
1025 loginuid
= simple_strtoul(page
, &tmp
, 10);
1031 length
= audit_set_loginuid(current
, loginuid
);
1032 if (likely(length
== 0))
1036 free_page((unsigned long) page
);
1040 static const struct file_operations proc_loginuid_operations
= {
1041 .read
= proc_loginuid_read
,
1042 .write
= proc_loginuid_write
,
1046 #ifdef CONFIG_FAULT_INJECTION
1047 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1048 size_t count
, loff_t
*ppos
)
1050 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
1051 char buffer
[PROC_NUMBUF
];
1057 make_it_fail
= task
->make_it_fail
;
1058 put_task_struct(task
);
1060 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1062 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1065 static ssize_t
proc_fault_inject_write(struct file
* file
,
1066 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1068 struct task_struct
*task
;
1069 char buffer
[PROC_NUMBUF
], *end
;
1072 if (!capable(CAP_SYS_RESOURCE
))
1074 memset(buffer
, 0, sizeof(buffer
));
1075 if (count
> sizeof(buffer
) - 1)
1076 count
= sizeof(buffer
) - 1;
1077 if (copy_from_user(buffer
, buf
, count
))
1079 make_it_fail
= simple_strtol(buffer
, &end
, 0);
1082 task
= get_proc_task(file
->f_dentry
->d_inode
);
1085 task
->make_it_fail
= make_it_fail
;
1086 put_task_struct(task
);
1087 if (end
- buffer
== 0)
1089 return end
- buffer
;
1092 static const struct file_operations proc_fault_inject_operations
= {
1093 .read
= proc_fault_inject_read
,
1094 .write
= proc_fault_inject_write
,
1099 #ifdef CONFIG_SCHED_DEBUG
1101 * Print out various scheduling related per-task fields:
1103 static int sched_show(struct seq_file
*m
, void *v
)
1105 struct inode
*inode
= m
->private;
1106 struct task_struct
*p
;
1110 p
= get_proc_task(inode
);
1113 proc_sched_show_task(p
, m
);
1121 sched_write(struct file
*file
, const char __user
*buf
,
1122 size_t count
, loff_t
*offset
)
1124 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1125 struct task_struct
*p
;
1129 p
= get_proc_task(inode
);
1132 proc_sched_set_task(p
);
1139 static int sched_open(struct inode
*inode
, struct file
*filp
)
1143 ret
= single_open(filp
, sched_show
, NULL
);
1145 struct seq_file
*m
= filp
->private_data
;
1152 static const struct file_operations proc_pid_sched_operations
= {
1155 .write
= sched_write
,
1156 .llseek
= seq_lseek
,
1157 .release
= single_release
,
1162 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1164 struct inode
*inode
= dentry
->d_inode
;
1165 int error
= -EACCES
;
1167 /* We don't need a base pointer in the /proc filesystem */
1168 path_put(&nd
->path
);
1170 /* Are we allowed to snoop on the tasks file descriptors? */
1171 if (!proc_fd_access_allowed(inode
))
1174 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &nd
->path
);
1175 nd
->last_type
= LAST_BIND
;
1177 return ERR_PTR(error
);
1180 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1182 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1189 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1190 len
= PTR_ERR(pathname
);
1191 if (IS_ERR(pathname
))
1193 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1197 if (copy_to_user(buffer
, pathname
, len
))
1200 free_page((unsigned long)tmp
);
1204 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1206 int error
= -EACCES
;
1207 struct inode
*inode
= dentry
->d_inode
;
1210 /* Are we allowed to snoop on the tasks file descriptors? */
1211 if (!proc_fd_access_allowed(inode
))
1214 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &path
);
1218 error
= do_proc_readlink(&path
, buffer
, buflen
);
1224 static const struct inode_operations proc_pid_link_inode_operations
= {
1225 .readlink
= proc_pid_readlink
,
1226 .follow_link
= proc_pid_follow_link
,
1227 .setattr
= proc_setattr
,
1231 /* building an inode */
1233 static int task_dumpable(struct task_struct
*task
)
1236 struct mm_struct
*mm
;
1241 dumpable
= get_dumpable(mm
);
1249 static struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1251 struct inode
* inode
;
1252 struct proc_inode
*ei
;
1254 /* We need a new inode */
1256 inode
= new_inode(sb
);
1262 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1263 inode
->i_op
= &proc_def_inode_operations
;
1266 * grab the reference to task.
1268 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1274 if (task_dumpable(task
)) {
1275 inode
->i_uid
= task
->euid
;
1276 inode
->i_gid
= task
->egid
;
1278 security_task_to_inode(task
, inode
);
1288 static int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1290 struct inode
*inode
= dentry
->d_inode
;
1291 struct task_struct
*task
;
1292 generic_fillattr(inode
, stat
);
1297 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1299 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1300 task_dumpable(task
)) {
1301 stat
->uid
= task
->euid
;
1302 stat
->gid
= task
->egid
;
1312 * Exceptional case: normally we are not allowed to unhash a busy
1313 * directory. In this case, however, we can do it - no aliasing problems
1314 * due to the way we treat inodes.
1316 * Rewrite the inode's ownerships here because the owning task may have
1317 * performed a setuid(), etc.
1319 * Before the /proc/pid/status file was created the only way to read
1320 * the effective uid of a /process was to stat /proc/pid. Reading
1321 * /proc/pid/status is slow enough that procps and other packages
1322 * kept stating /proc/pid. To keep the rules in /proc simple I have
1323 * made this apply to all per process world readable and executable
1326 static int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1328 struct inode
*inode
= dentry
->d_inode
;
1329 struct task_struct
*task
= get_proc_task(inode
);
1331 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1332 task_dumpable(task
)) {
1333 inode
->i_uid
= task
->euid
;
1334 inode
->i_gid
= task
->egid
;
1339 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1340 security_task_to_inode(task
, inode
);
1341 put_task_struct(task
);
1348 static int pid_delete_dentry(struct dentry
* dentry
)
1350 /* Is the task we represent dead?
1351 * If so, then don't put the dentry on the lru list,
1352 * kill it immediately.
1354 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1357 static struct dentry_operations pid_dentry_operations
=
1359 .d_revalidate
= pid_revalidate
,
1360 .d_delete
= pid_delete_dentry
,
1365 typedef struct dentry
*instantiate_t(struct inode
*, struct dentry
*,
1366 struct task_struct
*, const void *);
1369 * Fill a directory entry.
1371 * If possible create the dcache entry and derive our inode number and
1372 * file type from dcache entry.
1374 * Since all of the proc inode numbers are dynamically generated, the inode
1375 * numbers do not exist until the inode is cache. This means creating the
1376 * the dcache entry in readdir is necessary to keep the inode numbers
1377 * reported by readdir in sync with the inode numbers reported
1380 static int proc_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1381 char *name
, int len
,
1382 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1384 struct dentry
*child
, *dir
= filp
->f_path
.dentry
;
1385 struct inode
*inode
;
1388 unsigned type
= DT_UNKNOWN
;
1392 qname
.hash
= full_name_hash(name
, len
);
1394 child
= d_lookup(dir
, &qname
);
1397 new = d_alloc(dir
, &qname
);
1399 child
= instantiate(dir
->d_inode
, new, task
, ptr
);
1406 if (!child
|| IS_ERR(child
) || !child
->d_inode
)
1407 goto end_instantiate
;
1408 inode
= child
->d_inode
;
1411 type
= inode
->i_mode
>> 12;
1416 ino
= find_inode_number(dir
, &qname
);
1419 return filldir(dirent
, name
, len
, filp
->f_pos
, ino
, type
);
1422 static unsigned name_to_int(struct dentry
*dentry
)
1424 const char *name
= dentry
->d_name
.name
;
1425 int len
= dentry
->d_name
.len
;
1428 if (len
> 1 && *name
== '0')
1431 unsigned c
= *name
++ - '0';
1434 if (n
>= (~0U-9)/10)
1444 #define PROC_FDINFO_MAX 64
1446 static int proc_fd_info(struct inode
*inode
, struct path
*path
, char *info
)
1448 struct task_struct
*task
= get_proc_task(inode
);
1449 struct files_struct
*files
= NULL
;
1451 int fd
= proc_fd(inode
);
1454 files
= get_files_struct(task
);
1455 put_task_struct(task
);
1459 * We are not taking a ref to the file structure, so we must
1462 spin_lock(&files
->file_lock
);
1463 file
= fcheck_files(files
, fd
);
1466 *path
= file
->f_path
;
1467 path_get(&file
->f_path
);
1470 snprintf(info
, PROC_FDINFO_MAX
,
1473 (long long) file
->f_pos
,
1475 spin_unlock(&files
->file_lock
);
1476 put_files_struct(files
);
1479 spin_unlock(&files
->file_lock
);
1480 put_files_struct(files
);
1485 static int proc_fd_link(struct inode
*inode
, struct path
*path
)
1487 return proc_fd_info(inode
, path
, NULL
);
1490 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1492 struct inode
*inode
= dentry
->d_inode
;
1493 struct task_struct
*task
= get_proc_task(inode
);
1494 int fd
= proc_fd(inode
);
1495 struct files_struct
*files
;
1498 files
= get_files_struct(task
);
1501 if (fcheck_files(files
, fd
)) {
1503 put_files_struct(files
);
1504 if (task_dumpable(task
)) {
1505 inode
->i_uid
= task
->euid
;
1506 inode
->i_gid
= task
->egid
;
1511 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1512 security_task_to_inode(task
, inode
);
1513 put_task_struct(task
);
1517 put_files_struct(files
);
1519 put_task_struct(task
);
1525 static struct dentry_operations tid_fd_dentry_operations
=
1527 .d_revalidate
= tid_fd_revalidate
,
1528 .d_delete
= pid_delete_dentry
,
1531 static struct dentry
*proc_fd_instantiate(struct inode
*dir
,
1532 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1534 unsigned fd
= *(const unsigned *)ptr
;
1536 struct files_struct
*files
;
1537 struct inode
*inode
;
1538 struct proc_inode
*ei
;
1539 struct dentry
*error
= ERR_PTR(-ENOENT
);
1541 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1546 files
= get_files_struct(task
);
1549 inode
->i_mode
= S_IFLNK
;
1552 * We are not taking a ref to the file structure, so we must
1555 spin_lock(&files
->file_lock
);
1556 file
= fcheck_files(files
, fd
);
1559 if (file
->f_mode
& 1)
1560 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1561 if (file
->f_mode
& 2)
1562 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1563 spin_unlock(&files
->file_lock
);
1564 put_files_struct(files
);
1566 inode
->i_op
= &proc_pid_link_inode_operations
;
1568 ei
->op
.proc_get_link
= proc_fd_link
;
1569 dentry
->d_op
= &tid_fd_dentry_operations
;
1570 d_add(dentry
, inode
);
1571 /* Close the race of the process dying before we return the dentry */
1572 if (tid_fd_revalidate(dentry
, NULL
))
1578 spin_unlock(&files
->file_lock
);
1579 put_files_struct(files
);
1585 static struct dentry
*proc_lookupfd_common(struct inode
*dir
,
1586 struct dentry
*dentry
,
1587 instantiate_t instantiate
)
1589 struct task_struct
*task
= get_proc_task(dir
);
1590 unsigned fd
= name_to_int(dentry
);
1591 struct dentry
*result
= ERR_PTR(-ENOENT
);
1598 result
= instantiate(dir
, dentry
, task
, &fd
);
1600 put_task_struct(task
);
1605 static int proc_readfd_common(struct file
* filp
, void * dirent
,
1606 filldir_t filldir
, instantiate_t instantiate
)
1608 struct dentry
*dentry
= filp
->f_path
.dentry
;
1609 struct inode
*inode
= dentry
->d_inode
;
1610 struct task_struct
*p
= get_proc_task(inode
);
1611 unsigned int fd
, ino
;
1613 struct files_struct
* files
;
1614 struct fdtable
*fdt
;
1624 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1628 ino
= parent_ino(dentry
);
1629 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1633 files
= get_files_struct(p
);
1637 fdt
= files_fdtable(files
);
1638 for (fd
= filp
->f_pos
-2;
1640 fd
++, filp
->f_pos
++) {
1641 char name
[PROC_NUMBUF
];
1644 if (!fcheck_files(files
, fd
))
1648 len
= snprintf(name
, sizeof(name
), "%d", fd
);
1649 if (proc_fill_cache(filp
, dirent
, filldir
,
1650 name
, len
, instantiate
,
1658 put_files_struct(files
);
1666 static struct dentry
*proc_lookupfd(struct inode
*dir
, struct dentry
*dentry
,
1667 struct nameidata
*nd
)
1669 return proc_lookupfd_common(dir
, dentry
, proc_fd_instantiate
);
1672 static int proc_readfd(struct file
*filp
, void *dirent
, filldir_t filldir
)
1674 return proc_readfd_common(filp
, dirent
, filldir
, proc_fd_instantiate
);
1677 static ssize_t
proc_fdinfo_read(struct file
*file
, char __user
*buf
,
1678 size_t len
, loff_t
*ppos
)
1680 char tmp
[PROC_FDINFO_MAX
];
1681 int err
= proc_fd_info(file
->f_path
.dentry
->d_inode
, NULL
, tmp
);
1683 err
= simple_read_from_buffer(buf
, len
, ppos
, tmp
, strlen(tmp
));
1687 static const struct file_operations proc_fdinfo_file_operations
= {
1688 .open
= nonseekable_open
,
1689 .read
= proc_fdinfo_read
,
1692 static const struct file_operations proc_fd_operations
= {
1693 .read
= generic_read_dir
,
1694 .readdir
= proc_readfd
,
1698 * /proc/pid/fd needs a special permission handler so that a process can still
1699 * access /proc/self/fd after it has executed a setuid().
1701 static int proc_fd_permission(struct inode
*inode
, int mask
,
1702 struct nameidata
*nd
)
1706 rv
= generic_permission(inode
, mask
, NULL
);
1709 if (task_pid(current
) == proc_pid(inode
))
1715 * proc directories can do almost nothing..
1717 static const struct inode_operations proc_fd_inode_operations
= {
1718 .lookup
= proc_lookupfd
,
1719 .permission
= proc_fd_permission
,
1720 .setattr
= proc_setattr
,
1723 static struct dentry
*proc_fdinfo_instantiate(struct inode
*dir
,
1724 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1726 unsigned fd
= *(unsigned *)ptr
;
1727 struct inode
*inode
;
1728 struct proc_inode
*ei
;
1729 struct dentry
*error
= ERR_PTR(-ENOENT
);
1731 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1736 inode
->i_mode
= S_IFREG
| S_IRUSR
;
1737 inode
->i_fop
= &proc_fdinfo_file_operations
;
1738 dentry
->d_op
= &tid_fd_dentry_operations
;
1739 d_add(dentry
, inode
);
1740 /* Close the race of the process dying before we return the dentry */
1741 if (tid_fd_revalidate(dentry
, NULL
))
1748 static struct dentry
*proc_lookupfdinfo(struct inode
*dir
,
1749 struct dentry
*dentry
,
1750 struct nameidata
*nd
)
1752 return proc_lookupfd_common(dir
, dentry
, proc_fdinfo_instantiate
);
1755 static int proc_readfdinfo(struct file
*filp
, void *dirent
, filldir_t filldir
)
1757 return proc_readfd_common(filp
, dirent
, filldir
,
1758 proc_fdinfo_instantiate
);
1761 static const struct file_operations proc_fdinfo_operations
= {
1762 .read
= generic_read_dir
,
1763 .readdir
= proc_readfdinfo
,
1767 * proc directories can do almost nothing..
1769 static const struct inode_operations proc_fdinfo_inode_operations
= {
1770 .lookup
= proc_lookupfdinfo
,
1771 .setattr
= proc_setattr
,
1775 static struct dentry
*proc_pident_instantiate(struct inode
*dir
,
1776 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1778 const struct pid_entry
*p
= ptr
;
1779 struct inode
*inode
;
1780 struct proc_inode
*ei
;
1781 struct dentry
*error
= ERR_PTR(-EINVAL
);
1783 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1788 inode
->i_mode
= p
->mode
;
1789 if (S_ISDIR(inode
->i_mode
))
1790 inode
->i_nlink
= 2; /* Use getattr to fix if necessary */
1792 inode
->i_op
= p
->iop
;
1794 inode
->i_fop
= p
->fop
;
1796 dentry
->d_op
= &pid_dentry_operations
;
1797 d_add(dentry
, inode
);
1798 /* Close the race of the process dying before we return the dentry */
1799 if (pid_revalidate(dentry
, NULL
))
1805 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
1806 struct dentry
*dentry
,
1807 const struct pid_entry
*ents
,
1810 struct inode
*inode
;
1811 struct dentry
*error
;
1812 struct task_struct
*task
= get_proc_task(dir
);
1813 const struct pid_entry
*p
, *last
;
1815 error
= ERR_PTR(-ENOENT
);
1822 * Yes, it does not scale. And it should not. Don't add
1823 * new entries into /proc/<tgid>/ without very good reasons.
1825 last
= &ents
[nents
- 1];
1826 for (p
= ents
; p
<= last
; p
++) {
1827 if (p
->len
!= dentry
->d_name
.len
)
1829 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1835 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
1837 put_task_struct(task
);
1842 static int proc_pident_fill_cache(struct file
*filp
, void *dirent
,
1843 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
1845 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
1846 proc_pident_instantiate
, task
, p
);
1849 static int proc_pident_readdir(struct file
*filp
,
1850 void *dirent
, filldir_t filldir
,
1851 const struct pid_entry
*ents
, unsigned int nents
)
1854 struct dentry
*dentry
= filp
->f_path
.dentry
;
1855 struct inode
*inode
= dentry
->d_inode
;
1856 struct task_struct
*task
= get_proc_task(inode
);
1857 const struct pid_entry
*p
, *last
;
1870 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
1876 ino
= parent_ino(dentry
);
1877 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
1889 last
= &ents
[nents
- 1];
1891 if (proc_pident_fill_cache(filp
, dirent
, filldir
, task
, p
) < 0)
1900 put_task_struct(task
);
1905 #ifdef CONFIG_SECURITY
1906 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
1907 size_t count
, loff_t
*ppos
)
1909 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1912 struct task_struct
*task
= get_proc_task(inode
);
1917 length
= security_getprocattr(task
,
1918 (char*)file
->f_path
.dentry
->d_name
.name
,
1920 put_task_struct(task
);
1922 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
1927 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
1928 size_t count
, loff_t
*ppos
)
1930 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1933 struct task_struct
*task
= get_proc_task(inode
);
1938 if (count
> PAGE_SIZE
)
1941 /* No partial writes. */
1947 page
= (char*)__get_free_page(GFP_TEMPORARY
);
1952 if (copy_from_user(page
, buf
, count
))
1955 length
= security_setprocattr(task
,
1956 (char*)file
->f_path
.dentry
->d_name
.name
,
1957 (void*)page
, count
);
1959 free_page((unsigned long) page
);
1961 put_task_struct(task
);
1966 static const struct file_operations proc_pid_attr_operations
= {
1967 .read
= proc_pid_attr_read
,
1968 .write
= proc_pid_attr_write
,
1971 static const struct pid_entry attr_dir_stuff
[] = {
1972 REG("current", S_IRUGO
|S_IWUGO
, pid_attr
),
1973 REG("prev", S_IRUGO
, pid_attr
),
1974 REG("exec", S_IRUGO
|S_IWUGO
, pid_attr
),
1975 REG("fscreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1976 REG("keycreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1977 REG("sockcreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1980 static int proc_attr_dir_readdir(struct file
* filp
,
1981 void * dirent
, filldir_t filldir
)
1983 return proc_pident_readdir(filp
,dirent
,filldir
,
1984 attr_dir_stuff
,ARRAY_SIZE(attr_dir_stuff
));
1987 static const struct file_operations proc_attr_dir_operations
= {
1988 .read
= generic_read_dir
,
1989 .readdir
= proc_attr_dir_readdir
,
1992 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
1993 struct dentry
*dentry
, struct nameidata
*nd
)
1995 return proc_pident_lookup(dir
, dentry
,
1996 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
1999 static const struct inode_operations proc_attr_dir_inode_operations
= {
2000 .lookup
= proc_attr_dir_lookup
,
2001 .getattr
= pid_getattr
,
2002 .setattr
= proc_setattr
,
2007 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
2008 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2009 size_t count
, loff_t
*ppos
)
2011 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
2012 struct mm_struct
*mm
;
2013 char buffer
[PROC_NUMBUF
];
2021 mm
= get_task_mm(task
);
2023 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2024 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2025 MMF_DUMP_FILTER_SHIFT
));
2027 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2030 put_task_struct(task
);
2035 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2036 const char __user
*buf
,
2040 struct task_struct
*task
;
2041 struct mm_struct
*mm
;
2042 char buffer
[PROC_NUMBUF
], *end
;
2049 memset(buffer
, 0, sizeof(buffer
));
2050 if (count
> sizeof(buffer
) - 1)
2051 count
= sizeof(buffer
) - 1;
2052 if (copy_from_user(buffer
, buf
, count
))
2056 val
= (unsigned int)simple_strtoul(buffer
, &end
, 0);
2059 if (end
- buffer
== 0)
2063 task
= get_proc_task(file
->f_dentry
->d_inode
);
2068 mm
= get_task_mm(task
);
2072 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2074 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2076 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2081 put_task_struct(task
);
2086 static const struct file_operations proc_coredump_filter_operations
= {
2087 .read
= proc_coredump_filter_read
,
2088 .write
= proc_coredump_filter_write
,
2095 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
2098 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2099 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2100 char tmp
[PROC_NUMBUF
];
2103 sprintf(tmp
, "%d", tgid
);
2104 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
2107 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
2109 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2110 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2111 char tmp
[PROC_NUMBUF
];
2113 return ERR_PTR(-ENOENT
);
2114 sprintf(tmp
, "%d", task_tgid_nr_ns(current
, ns
));
2115 return ERR_PTR(vfs_follow_link(nd
,tmp
));
2118 static const struct inode_operations proc_self_inode_operations
= {
2119 .readlink
= proc_self_readlink
,
2120 .follow_link
= proc_self_follow_link
,
2126 * These are the directory entries in the root directory of /proc
2127 * that properly belong to the /proc filesystem, as they describe
2128 * describe something that is process related.
2130 static const struct pid_entry proc_base_stuff
[] = {
2131 NOD("self", S_IFLNK
|S_IRWXUGO
,
2132 &proc_self_inode_operations
, NULL
, {}),
2136 * Exceptional case: normally we are not allowed to unhash a busy
2137 * directory. In this case, however, we can do it - no aliasing problems
2138 * due to the way we treat inodes.
2140 static int proc_base_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
2142 struct inode
*inode
= dentry
->d_inode
;
2143 struct task_struct
*task
= get_proc_task(inode
);
2145 put_task_struct(task
);
2152 static struct dentry_operations proc_base_dentry_operations
=
2154 .d_revalidate
= proc_base_revalidate
,
2155 .d_delete
= pid_delete_dentry
,
2158 static struct dentry
*proc_base_instantiate(struct inode
*dir
,
2159 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2161 const struct pid_entry
*p
= ptr
;
2162 struct inode
*inode
;
2163 struct proc_inode
*ei
;
2164 struct dentry
*error
= ERR_PTR(-EINVAL
);
2166 /* Allocate the inode */
2167 error
= ERR_PTR(-ENOMEM
);
2168 inode
= new_inode(dir
->i_sb
);
2172 /* Initialize the inode */
2174 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
2177 * grab the reference to the task.
2179 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
2185 inode
->i_mode
= p
->mode
;
2186 if (S_ISDIR(inode
->i_mode
))
2188 if (S_ISLNK(inode
->i_mode
))
2191 inode
->i_op
= p
->iop
;
2193 inode
->i_fop
= p
->fop
;
2195 dentry
->d_op
= &proc_base_dentry_operations
;
2196 d_add(dentry
, inode
);
2205 static struct dentry
*proc_base_lookup(struct inode
*dir
, struct dentry
*dentry
)
2207 struct dentry
*error
;
2208 struct task_struct
*task
= get_proc_task(dir
);
2209 const struct pid_entry
*p
, *last
;
2211 error
= ERR_PTR(-ENOENT
);
2216 /* Lookup the directory entry */
2217 last
= &proc_base_stuff
[ARRAY_SIZE(proc_base_stuff
) - 1];
2218 for (p
= proc_base_stuff
; p
<= last
; p
++) {
2219 if (p
->len
!= dentry
->d_name
.len
)
2221 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2227 error
= proc_base_instantiate(dir
, dentry
, task
, p
);
2230 put_task_struct(task
);
2235 static int proc_base_fill_cache(struct file
*filp
, void *dirent
,
2236 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2238 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2239 proc_base_instantiate
, task
, p
);
2242 #ifdef CONFIG_TASK_IO_ACCOUNTING
2243 static int proc_pid_io_accounting(struct task_struct
*task
, char *buffer
)
2245 return sprintf(buffer
,
2246 #ifdef CONFIG_TASK_XACCT
2252 "read_bytes: %llu\n"
2253 "write_bytes: %llu\n"
2254 "cancelled_write_bytes: %llu\n",
2255 #ifdef CONFIG_TASK_XACCT
2256 (unsigned long long)task
->rchar
,
2257 (unsigned long long)task
->wchar
,
2258 (unsigned long long)task
->syscr
,
2259 (unsigned long long)task
->syscw
,
2261 (unsigned long long)task
->ioac
.read_bytes
,
2262 (unsigned long long)task
->ioac
.write_bytes
,
2263 (unsigned long long)task
->ioac
.cancelled_write_bytes
);
2270 static const struct file_operations proc_task_operations
;
2271 static const struct inode_operations proc_task_inode_operations
;
2273 static const struct pid_entry tgid_base_stuff
[] = {
2274 DIR("task", S_IRUGO
|S_IXUGO
, task
),
2275 DIR("fd", S_IRUSR
|S_IXUSR
, fd
),
2276 DIR("fdinfo", S_IRUSR
|S_IXUSR
, fdinfo
),
2277 REG("environ", S_IRUSR
, environ
),
2278 INF("auxv", S_IRUSR
, pid_auxv
),
2279 ONE("status", S_IRUGO
, pid_status
),
2280 INF("limits", S_IRUSR
, pid_limits
),
2281 #ifdef CONFIG_SCHED_DEBUG
2282 REG("sched", S_IRUGO
|S_IWUSR
, pid_sched
),
2284 INF("cmdline", S_IRUGO
, pid_cmdline
),
2285 ONE("stat", S_IRUGO
, tgid_stat
),
2286 ONE("statm", S_IRUGO
, pid_statm
),
2287 REG("maps", S_IRUGO
, maps
),
2289 REG("numa_maps", S_IRUGO
, numa_maps
),
2291 REG("mem", S_IRUSR
|S_IWUSR
, mem
),
2295 REG("mounts", S_IRUGO
, mounts
),
2296 REG("mountstats", S_IRUSR
, mountstats
),
2297 #ifdef CONFIG_PROC_PAGE_MONITOR
2298 REG("clear_refs", S_IWUSR
, clear_refs
),
2299 REG("smaps", S_IRUGO
, smaps
),
2300 REG("pagemap", S_IRUSR
, pagemap
),
2302 #ifdef CONFIG_SECURITY
2303 DIR("attr", S_IRUGO
|S_IXUGO
, attr_dir
),
2305 #ifdef CONFIG_KALLSYMS
2306 INF("wchan", S_IRUGO
, pid_wchan
),
2308 #ifdef CONFIG_SCHEDSTATS
2309 INF("schedstat", S_IRUGO
, pid_schedstat
),
2311 #ifdef CONFIG_LATENCYTOP
2312 REG("latency", S_IRUGO
, lstats
),
2314 #ifdef CONFIG_PROC_PID_CPUSET
2315 REG("cpuset", S_IRUGO
, cpuset
),
2317 #ifdef CONFIG_CGROUPS
2318 REG("cgroup", S_IRUGO
, cgroup
),
2320 INF("oom_score", S_IRUGO
, oom_score
),
2321 REG("oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
2322 #ifdef CONFIG_AUDITSYSCALL
2323 REG("loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
2325 #ifdef CONFIG_FAULT_INJECTION
2326 REG("make-it-fail", S_IRUGO
|S_IWUSR
, fault_inject
),
2328 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
2329 REG("coredump_filter", S_IRUGO
|S_IWUSR
, coredump_filter
),
2331 #ifdef CONFIG_TASK_IO_ACCOUNTING
2332 INF("io", S_IRUGO
, pid_io_accounting
),
2336 static int proc_tgid_base_readdir(struct file
* filp
,
2337 void * dirent
, filldir_t filldir
)
2339 return proc_pident_readdir(filp
,dirent
,filldir
,
2340 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
2343 static const struct file_operations proc_tgid_base_operations
= {
2344 .read
= generic_read_dir
,
2345 .readdir
= proc_tgid_base_readdir
,
2348 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2349 return proc_pident_lookup(dir
, dentry
,
2350 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2353 static const struct inode_operations proc_tgid_base_inode_operations
= {
2354 .lookup
= proc_tgid_base_lookup
,
2355 .getattr
= pid_getattr
,
2356 .setattr
= proc_setattr
,
2359 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2361 struct dentry
*dentry
, *leader
, *dir
;
2362 char buf
[PROC_NUMBUF
];
2366 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2367 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2369 if (!(current
->flags
& PF_EXITING
))
2370 shrink_dcache_parent(dentry
);
2379 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2380 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2385 name
.len
= strlen(name
.name
);
2386 dir
= d_hash_and_lookup(leader
, &name
);
2388 goto out_put_leader
;
2391 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2392 dentry
= d_hash_and_lookup(dir
, &name
);
2394 shrink_dcache_parent(dentry
);
2407 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2408 * @task: task that should be flushed.
2410 * When flushing dentries from proc, one needs to flush them from global
2411 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2412 * in. This call is supposed to do all of this job.
2414 * Looks in the dcache for
2416 * /proc/@tgid/task/@pid
2417 * if either directory is present flushes it and all of it'ts children
2420 * It is safe and reasonable to cache /proc entries for a task until
2421 * that task exits. After that they just clog up the dcache with
2422 * useless entries, possibly causing useful dcache entries to be
2423 * flushed instead. This routine is proved to flush those useless
2424 * dcache entries at process exit time.
2426 * NOTE: This routine is just an optimization so it does not guarantee
2427 * that no dcache entries will exist at process exit time it
2428 * just makes it very unlikely that any will persist.
2431 void proc_flush_task(struct task_struct
*task
)
2434 struct pid
*pid
, *tgid
= NULL
;
2437 pid
= task_pid(task
);
2438 if (thread_group_leader(task
))
2439 tgid
= task_tgid(task
);
2441 for (i
= 0; i
<= pid
->level
; i
++) {
2442 upid
= &pid
->numbers
[i
];
2443 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
2444 tgid
? tgid
->numbers
[i
].nr
: 0);
2447 upid
= &pid
->numbers
[pid
->level
];
2449 pid_ns_release_proc(upid
->ns
);
2452 static struct dentry
*proc_pid_instantiate(struct inode
*dir
,
2453 struct dentry
* dentry
,
2454 struct task_struct
*task
, const void *ptr
)
2456 struct dentry
*error
= ERR_PTR(-ENOENT
);
2457 struct inode
*inode
;
2459 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2463 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2464 inode
->i_op
= &proc_tgid_base_inode_operations
;
2465 inode
->i_fop
= &proc_tgid_base_operations
;
2466 inode
->i_flags
|=S_IMMUTABLE
;
2468 #ifdef CONFIG_SECURITY
2469 inode
->i_nlink
+= 1;
2472 dentry
->d_op
= &pid_dentry_operations
;
2474 d_add(dentry
, inode
);
2475 /* Close the race of the process dying before we return the dentry */
2476 if (pid_revalidate(dentry
, NULL
))
2482 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2484 struct dentry
*result
= ERR_PTR(-ENOENT
);
2485 struct task_struct
*task
;
2487 struct pid_namespace
*ns
;
2489 result
= proc_base_lookup(dir
, dentry
);
2490 if (!IS_ERR(result
) || PTR_ERR(result
) != -ENOENT
)
2493 tgid
= name_to_int(dentry
);
2497 ns
= dentry
->d_sb
->s_fs_info
;
2499 task
= find_task_by_pid_ns(tgid
, ns
);
2501 get_task_struct(task
);
2506 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
2507 put_task_struct(task
);
2513 * Find the first task with tgid >= tgid
2518 struct task_struct
*task
;
2520 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
2525 put_task_struct(iter
.task
);
2529 pid
= find_ge_pid(iter
.tgid
, ns
);
2531 iter
.tgid
= pid_nr_ns(pid
, ns
);
2532 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
2533 /* What we to know is if the pid we have find is the
2534 * pid of a thread_group_leader. Testing for task
2535 * being a thread_group_leader is the obvious thing
2536 * todo but there is a window when it fails, due to
2537 * the pid transfer logic in de_thread.
2539 * So we perform the straight forward test of seeing
2540 * if the pid we have found is the pid of a thread
2541 * group leader, and don't worry if the task we have
2542 * found doesn't happen to be a thread group leader.
2543 * As we don't care in the case of readdir.
2545 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
2549 get_task_struct(iter
.task
);
2555 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
2557 static int proc_pid_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
2558 struct tgid_iter iter
)
2560 char name
[PROC_NUMBUF
];
2561 int len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
2562 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
2563 proc_pid_instantiate
, iter
.task
, NULL
);
2566 /* for the /proc/ directory itself, after non-process stuff has been done */
2567 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2569 unsigned int nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
2570 struct task_struct
*reaper
= get_proc_task(filp
->f_path
.dentry
->d_inode
);
2571 struct tgid_iter iter
;
2572 struct pid_namespace
*ns
;
2577 for (; nr
< ARRAY_SIZE(proc_base_stuff
); filp
->f_pos
++, nr
++) {
2578 const struct pid_entry
*p
= &proc_base_stuff
[nr
];
2579 if (proc_base_fill_cache(filp
, dirent
, filldir
, reaper
, p
) < 0)
2583 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
2585 iter
.tgid
= filp
->f_pos
- TGID_OFFSET
;
2586 for (iter
= next_tgid(ns
, iter
);
2588 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
2589 filp
->f_pos
= iter
.tgid
+ TGID_OFFSET
;
2590 if (proc_pid_fill_cache(filp
, dirent
, filldir
, iter
) < 0) {
2591 put_task_struct(iter
.task
);
2595 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
2597 put_task_struct(reaper
);
2605 static const struct pid_entry tid_base_stuff
[] = {
2606 DIR("fd", S_IRUSR
|S_IXUSR
, fd
),
2607 DIR("fdinfo", S_IRUSR
|S_IXUSR
, fdinfo
),
2608 REG("environ", S_IRUSR
, environ
),
2609 INF("auxv", S_IRUSR
, pid_auxv
),
2610 ONE("status", S_IRUGO
, pid_status
),
2611 INF("limits", S_IRUSR
, pid_limits
),
2612 #ifdef CONFIG_SCHED_DEBUG
2613 REG("sched", S_IRUGO
|S_IWUSR
, pid_sched
),
2615 INF("cmdline", S_IRUGO
, pid_cmdline
),
2616 ONE("stat", S_IRUGO
, tid_stat
),
2617 ONE("statm", S_IRUGO
, pid_statm
),
2618 REG("maps", S_IRUGO
, maps
),
2620 REG("numa_maps", S_IRUGO
, numa_maps
),
2622 REG("mem", S_IRUSR
|S_IWUSR
, mem
),
2626 REG("mounts", S_IRUGO
, mounts
),
2627 #ifdef CONFIG_PROC_PAGE_MONITOR
2628 REG("clear_refs", S_IWUSR
, clear_refs
),
2629 REG("smaps", S_IRUGO
, smaps
),
2630 REG("pagemap", S_IRUSR
, pagemap
),
2632 #ifdef CONFIG_SECURITY
2633 DIR("attr", S_IRUGO
|S_IXUGO
, attr_dir
),
2635 #ifdef CONFIG_KALLSYMS
2636 INF("wchan", S_IRUGO
, pid_wchan
),
2638 #ifdef CONFIG_SCHEDSTATS
2639 INF("schedstat", S_IRUGO
, pid_schedstat
),
2641 #ifdef CONFIG_LATENCYTOP
2642 REG("latency", S_IRUGO
, lstats
),
2644 #ifdef CONFIG_PROC_PID_CPUSET
2645 REG("cpuset", S_IRUGO
, cpuset
),
2647 #ifdef CONFIG_CGROUPS
2648 REG("cgroup", S_IRUGO
, cgroup
),
2650 INF("oom_score", S_IRUGO
, oom_score
),
2651 REG("oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
2652 #ifdef CONFIG_AUDITSYSCALL
2653 REG("loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
2655 #ifdef CONFIG_FAULT_INJECTION
2656 REG("make-it-fail", S_IRUGO
|S_IWUSR
, fault_inject
),
2660 static int proc_tid_base_readdir(struct file
* filp
,
2661 void * dirent
, filldir_t filldir
)
2663 return proc_pident_readdir(filp
,dirent
,filldir
,
2664 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
2667 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2668 return proc_pident_lookup(dir
, dentry
,
2669 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
2672 static const struct file_operations proc_tid_base_operations
= {
2673 .read
= generic_read_dir
,
2674 .readdir
= proc_tid_base_readdir
,
2677 static const struct inode_operations proc_tid_base_inode_operations
= {
2678 .lookup
= proc_tid_base_lookup
,
2679 .getattr
= pid_getattr
,
2680 .setattr
= proc_setattr
,
2683 static struct dentry
*proc_task_instantiate(struct inode
*dir
,
2684 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2686 struct dentry
*error
= ERR_PTR(-ENOENT
);
2687 struct inode
*inode
;
2688 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2692 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2693 inode
->i_op
= &proc_tid_base_inode_operations
;
2694 inode
->i_fop
= &proc_tid_base_operations
;
2695 inode
->i_flags
|=S_IMMUTABLE
;
2697 #ifdef CONFIG_SECURITY
2698 inode
->i_nlink
+= 1;
2701 dentry
->d_op
= &pid_dentry_operations
;
2703 d_add(dentry
, inode
);
2704 /* Close the race of the process dying before we return the dentry */
2705 if (pid_revalidate(dentry
, NULL
))
2711 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2713 struct dentry
*result
= ERR_PTR(-ENOENT
);
2714 struct task_struct
*task
;
2715 struct task_struct
*leader
= get_proc_task(dir
);
2717 struct pid_namespace
*ns
;
2722 tid
= name_to_int(dentry
);
2726 ns
= dentry
->d_sb
->s_fs_info
;
2728 task
= find_task_by_pid_ns(tid
, ns
);
2730 get_task_struct(task
);
2734 if (!same_thread_group(leader
, task
))
2737 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
2739 put_task_struct(task
);
2741 put_task_struct(leader
);
2747 * Find the first tid of a thread group to return to user space.
2749 * Usually this is just the thread group leader, but if the users
2750 * buffer was too small or there was a seek into the middle of the
2751 * directory we have more work todo.
2753 * In the case of a short read we start with find_task_by_pid.
2755 * In the case of a seek we start with the leader and walk nr
2758 static struct task_struct
*first_tid(struct task_struct
*leader
,
2759 int tid
, int nr
, struct pid_namespace
*ns
)
2761 struct task_struct
*pos
;
2764 /* Attempt to start with the pid of a thread */
2765 if (tid
&& (nr
> 0)) {
2766 pos
= find_task_by_pid_ns(tid
, ns
);
2767 if (pos
&& (pos
->group_leader
== leader
))
2771 /* If nr exceeds the number of threads there is nothing todo */
2773 if (nr
&& nr
>= get_nr_threads(leader
))
2776 /* If we haven't found our starting place yet start
2777 * with the leader and walk nr threads forward.
2779 for (pos
= leader
; nr
> 0; --nr
) {
2780 pos
= next_thread(pos
);
2781 if (pos
== leader
) {
2787 get_task_struct(pos
);
2794 * Find the next thread in the thread list.
2795 * Return NULL if there is an error or no next thread.
2797 * The reference to the input task_struct is released.
2799 static struct task_struct
*next_tid(struct task_struct
*start
)
2801 struct task_struct
*pos
= NULL
;
2803 if (pid_alive(start
)) {
2804 pos
= next_thread(start
);
2805 if (thread_group_leader(pos
))
2808 get_task_struct(pos
);
2811 put_task_struct(start
);
2815 static int proc_task_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
2816 struct task_struct
*task
, int tid
)
2818 char name
[PROC_NUMBUF
];
2819 int len
= snprintf(name
, sizeof(name
), "%d", tid
);
2820 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
2821 proc_task_instantiate
, task
, NULL
);
2824 /* for the /proc/TGID/task/ directories */
2825 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2827 struct dentry
*dentry
= filp
->f_path
.dentry
;
2828 struct inode
*inode
= dentry
->d_inode
;
2829 struct task_struct
*leader
= NULL
;
2830 struct task_struct
*task
;
2831 int retval
= -ENOENT
;
2834 unsigned long pos
= filp
->f_pos
; /* avoiding "long long" filp->f_pos */
2835 struct pid_namespace
*ns
;
2837 task
= get_proc_task(inode
);
2841 if (pid_alive(task
)) {
2842 leader
= task
->group_leader
;
2843 get_task_struct(leader
);
2846 put_task_struct(task
);
2854 if (filldir(dirent
, ".", 1, pos
, ino
, DT_DIR
) < 0)
2859 ino
= parent_ino(dentry
);
2860 if (filldir(dirent
, "..", 2, pos
, ino
, DT_DIR
) < 0)
2866 /* f_version caches the tgid value that the last readdir call couldn't
2867 * return. lseek aka telldir automagically resets f_version to 0.
2869 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
2870 tid
= (int)filp
->f_version
;
2871 filp
->f_version
= 0;
2872 for (task
= first_tid(leader
, tid
, pos
- 2, ns
);
2874 task
= next_tid(task
), pos
++) {
2875 tid
= task_pid_nr_ns(task
, ns
);
2876 if (proc_task_fill_cache(filp
, dirent
, filldir
, task
, tid
) < 0) {
2877 /* returning this tgid failed, save it as the first
2878 * pid for the next readir call */
2879 filp
->f_version
= (u64
)tid
;
2880 put_task_struct(task
);
2886 put_task_struct(leader
);
2891 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
2893 struct inode
*inode
= dentry
->d_inode
;
2894 struct task_struct
*p
= get_proc_task(inode
);
2895 generic_fillattr(inode
, stat
);
2899 stat
->nlink
+= get_nr_threads(p
);
2907 static const struct inode_operations proc_task_inode_operations
= {
2908 .lookup
= proc_task_lookup
,
2909 .getattr
= proc_task_getattr
,
2910 .setattr
= proc_setattr
,
2913 static const struct file_operations proc_task_operations
= {
2914 .read
= generic_read_dir
,
2915 .readdir
= proc_task_readdir
,