[mirror_ubuntu-bionic-kernel.git] / fs / proc / task_nommu.c


#include <linux/mm.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/fs_struct.h>
#include <linux/mount.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include "internal.h"

/*
 * Logic: we've got two memory sums for each process, "shared", and
 * "non-shared". Shared memory may get counted more than once, for
 * each process that owns it. Non-shared memory is counted
 * accurately.
 */
void task_mem(struct seq_file *m, struct mm_struct *mm)
{
	struct vm_area_struct *vma;
	struct vm_region *region;
	struct rb_node *p;
	unsigned long bytes = 0, sbytes = 0, slack = 0, size;
        
	down_read(&mm->mmap_sem);
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
		vma = rb_entry(p, struct vm_area_struct, vm_rb);

		bytes += kobjsize(vma);

		region = vma->vm_region;
		if (region) {
			size = kobjsize(region);
			size += region->vm_end - region->vm_start;
		} else {
			size = vma->vm_end - vma->vm_start;
		}

		if (atomic_read(&mm->mm_count) > 1 ||
		    vma->vm_flags & VM_MAYSHARE) {
			sbytes += size;
		} else {
			bytes += size;
			if (region)
				slack = region->vm_end - vma->vm_end;
		}
	}

	if (atomic_read(&mm->mm_count) > 1)
		sbytes += kobjsize(mm);
	else
		bytes += kobjsize(mm);
	
	if (current->fs && current->fs->users > 1)
		sbytes += kobjsize(current->fs);
	else
		bytes += kobjsize(current->fs);

	if (current->files && atomic_read(&current->files->count) > 1)
		sbytes += kobjsize(current->files);
	else
		bytes += kobjsize(current->files);

	if (current->sighand && atomic_read(&current->sighand->count) > 1)
		sbytes += kobjsize(current->sighand);
	else
		bytes += kobjsize(current->sighand);

	bytes += kobjsize(current); /* includes kernel stack */

	seq_printf(m,
		"Mem:\t%8lu bytes\n"
		"Slack:\t%8lu bytes\n"
		"Shared:\t%8lu bytes\n",
		bytes, slack, sbytes);

	up_read(&mm->mmap_sem);
}

unsigned long task_vsize(struct mm_struct *mm)
{
	struct vm_area_struct *vma;
	struct rb_node *p;
	unsigned long vsize = 0;

	down_read(&mm->mmap_sem);
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
		vma = rb_entry(p, struct vm_area_struct, vm_rb);
		vsize += vma->vm_end - vma->vm_start;
	}
	up_read(&mm->mmap_sem);
	return vsize;
}

unsigned long task_statm(struct mm_struct *mm,
			 unsigned long *shared, unsigned long *text,
			 unsigned long *data, unsigned long *resident)
{
	struct vm_area_struct *vma;
	struct vm_region *region;
	struct rb_node *p;
	unsigned long size = kobjsize(mm);

	down_read(&mm->mmap_sem);
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
		vma = rb_entry(p, struct vm_area_struct, vm_rb);
		size += kobjsize(vma);
		region = vma->vm_region;
		if (region) {
			size += kobjsize(region);
			size += region->vm_end - region->vm_start;
		}
	}

	*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
		>> PAGE_SHIFT;
	*data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
		>> PAGE_SHIFT;
	up_read(&mm->mmap_sem);
	size >>= PAGE_SHIFT;
	size += *text + *data;
	*resident = size;
	return size;
}

static pid_t pid_of_stack(struct proc_maps_private *priv,
				struct vm_area_struct *vma, bool is_pid)
{
	struct inode *inode = priv->inode;
	struct task_struct *task;
	pid_t ret = 0;

	rcu_read_lock();
	task = pid_task(proc_pid(inode), PIDTYPE_PID);
	if (task) {
		task = task_of_stack(task, vma, is_pid);
		if (task)
			ret = task_pid_nr_ns(task, inode->i_sb->s_fs_info);
	}
	rcu_read_unlock();

	return ret;
}

/*
 * display a single VMA to a sequenced file
 */
static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
			  int is_pid)
{
	struct mm_struct *mm = vma->vm_mm;
	struct proc_maps_private *priv = m->private;
	unsigned long ino = 0;
	struct file *file;
	dev_t dev = 0;
	int flags;
	unsigned long long pgoff = 0;

	flags = vma->vm_flags;
	file = vma->vm_file;

	if (file) {
		struct inode *inode = file_inode(vma->vm_file);
		dev = inode->i_sb->s_dev;
		ino = inode->i_ino;
		pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
	}

	seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
	seq_printf(m,
		   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
		   vma->vm_start,
		   vma->vm_end,
		   flags & VM_READ ? 'r' : '-',
		   flags & VM_WRITE ? 'w' : '-',
		   flags & VM_EXEC ? 'x' : '-',
		   flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
		   pgoff,
		   MAJOR(dev), MINOR(dev), ino);

	if (file) {
		seq_pad(m, ' ');
		seq_file_path(m, file, "");
	} else if (mm) {
		pid_t tid = pid_of_stack(priv, vma, is_pid);

		if (tid != 0) {
			seq_pad(m, ' ');
			/*
			 * Thread stack in /proc/PID/task/TID/maps or
			 * the main process stack.
			 */
			if (!is_pid || (vma->vm_start <= mm->start_stack &&
			    vma->vm_end >= mm->start_stack))
				seq_printf(m, "[stack]");
			else
				seq_printf(m, "[stack:%d]", tid);
		}
	}

	seq_putc(m, '\n');
	return 0;
}

/*
 * display mapping lines for a particular process's /proc/pid/maps
 */
static int show_map(struct seq_file *m, void *_p, int is_pid)
{
	struct rb_node *p = _p;

	return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
			      is_pid);
}

static int show_pid_map(struct seq_file *m, void *_p)
{
	return show_map(m, _p, 1);
}

static int show_tid_map(struct seq_file *m, void *_p)
{
	return show_map(m, _p, 0);
}

static void *m_start(struct seq_file *m, loff_t *pos)
{
	struct proc_maps_private *priv = m->private;
	struct mm_struct *mm;
	struct rb_node *p;
	loff_t n = *pos;

	/* pin the task and mm whilst we play with them */
	priv->task = get_proc_task(priv->inode);
	if (!priv->task)
		return ERR_PTR(-ESRCH);

	mm = priv->mm;
	if (!mm || !atomic_inc_not_zero(&mm->mm_users))
		return NULL;

	down_read(&mm->mmap_sem);
	/* start from the Nth VMA */
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
		if (n-- == 0)
			return p;

	up_read(&mm->mmap_sem);
	mmput(mm);
	return NULL;
}

static void m_stop(struct seq_file *m, void *_vml)
{
	struct proc_maps_private *priv = m->private;

	if (!IS_ERR_OR_NULL(_vml)) {
		up_read(&priv->mm->mmap_sem);
		mmput(priv->mm);
	}
	if (priv->task) {
		put_task_struct(priv->task);
		priv->task = NULL;
	}
}

static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
{
	struct rb_node *p = _p;

	(*pos)++;
	return p ? rb_next(p) : NULL;
}

static const struct seq_operations proc_pid_maps_ops = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_pid_map
};

static const struct seq_operations proc_tid_maps_ops = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_tid_map
};

static int maps_open(struct inode *inode, struct file *file,
		     const struct seq_operations *ops)
{
	struct proc_maps_private *priv;

	priv = __seq_open_private(file, ops, sizeof(*priv));
	if (!priv)
		return -ENOMEM;

	priv->inode = inode;
	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
	if (IS_ERR(priv->mm)) {
		int err = PTR_ERR(priv->mm);

		seq_release_private(inode, file);
		return err;
	}

	return 0;
}


static int map_release(struct inode *inode, struct file *file)
{
	struct seq_file *seq = file->private_data;
	struct proc_maps_private *priv = seq->private;

	if (priv->mm)
		mmdrop(priv->mm);

	return seq_release_private(inode, file);
}

static int pid_maps_open(struct inode *inode, struct file *file)
{
	return maps_open(inode, file, &proc_pid_maps_ops);
}

static int tid_maps_open(struct inode *inode, struct file *file)
{
	return maps_open(inode, file, &proc_tid_maps_ops);
}

const struct file_operations proc_pid_maps_operations = {
	.open		= pid_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= map_release,
};

const struct file_operations proc_tid_maps_operations = {
	.open		= tid_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= map_release,
};
Commit	Line	Data
1da177e4 LT	1
	2	#include <linux/mm.h>
	3	#include <linux/file.h>
eb28062f	4	#include <linux/fdtable.h>
5ad4e53b	5	#include <linux/fs_struct.h>
1da177e4	6	#include <linux/mount.h>
5096add8	7	#include <linux/ptrace.h>
5a0e3ad6	8	#include <linux/slab.h>
1da177e4 LT	9	#include <linux/seq_file.h>
	10	#include "internal.h"
	11
	12	/*
	13	* Logic: we've got two memory sums for each process, "shared", and
025dfdaf	14	* "non-shared". Shared memory may get counted more than once, for
1da177e4 LT	15	* each process that owns it. Non-shared memory is counted
	16	* accurately.
	17	*/
df5f8314	18	void task_mem(struct seq_file m, struct mm_struct mm)
1da177e4	19	{
8feae131	20	struct vm_area_struct *vma;
38f71479	21	struct vm_region *region;
8feae131	22	struct rb_node *p;
38f71479	23	unsigned long bytes = 0, sbytes = 0, slack = 0, size;
1da177e4 LT	24
1da177e4 LT	25	down_read(&mm->mmap_sem);
8feae131 DH	26	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
8feae131 DH	27	vma = rb_entry(p, struct vm_area_struct, vm_rb);
1da177e4	28
8feae131	29	bytes += kobjsize(vma);
38f71479 DH	30
	31	region = vma->vm_region;
	32	if (region) {
	33	size = kobjsize(region);
	34	size += region->vm_end - region->vm_start;
	35	} else {
	36	size = vma->vm_end - vma->vm_start;
	37	}
	38
1da177e4	39	if (atomic_read(&mm->mm_count) > 1 \|\|
8feae131	40	vma->vm_flags & VM_MAYSHARE) {
38f71479	41	sbytes += size;
1da177e4	42	} else {
38f71479 DH	43	bytes += size;
	44	if (region)
	45	slack = region->vm_end - vma->vm_end;
1da177e4 LT	46	}
	47	}
	48
	49	if (atomic_read(&mm->mm_count) > 1)
	50	sbytes += kobjsize(mm);
	51	else
	52	bytes += kobjsize(mm);
	53
498052bb	54	if (current->fs && current->fs->users > 1)
1da177e4 LT	55	sbytes += kobjsize(current->fs);
	56	else
	57	bytes += kobjsize(current->fs);
	58
	59	if (current->files && atomic_read(&current->files->count) > 1)
	60	sbytes += kobjsize(current->files);
	61	else
	62	bytes += kobjsize(current->files);
	63
	64	if (current->sighand && atomic_read(&current->sighand->count) > 1)
	65	sbytes += kobjsize(current->sighand);
	66	else
	67	bytes += kobjsize(current->sighand);
	68
	69	bytes += kobjsize(current); /* includes kernel stack */
	70
df5f8314	71	seq_printf(m,
1da177e4 LT	72	"Mem:\t%8lu bytes\n"
	73	"Slack:\t%8lu bytes\n"
	74	"Shared:\t%8lu bytes\n",
	75	bytes, slack, sbytes);
	76
	77	up_read(&mm->mmap_sem);
1da177e4 LT	78	}
	79
	80	unsigned long task_vsize(struct mm_struct *mm)
	81	{
8feae131 DH	82	struct vm_area_struct *vma;
8feae131 DH	83	struct rb_node *p;
1da177e4 LT	84	unsigned long vsize = 0;
	85
	86	down_read(&mm->mmap_sem);
8feae131 DH	87	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
8feae131 DH	88	vma = rb_entry(p, struct vm_area_struct, vm_rb);
38f71479	89	vsize += vma->vm_end - vma->vm_start;
1da177e4 LT	90	}
	91	up_read(&mm->mmap_sem);
	92	return vsize;
	93	}
	94
a2ade7b6 AD	95	unsigned long task_statm(struct mm_struct *mm,
	96	unsigned long shared, unsigned long text,
	97	unsigned long data, unsigned long resident)
1da177e4	98	{
8feae131	99	struct vm_area_struct *vma;
38f71479	100	struct vm_region *region;
8feae131	101	struct rb_node *p;
a2ade7b6	102	unsigned long size = kobjsize(mm);
1da177e4 LT	103
1da177e4 LT	104	down_read(&mm->mmap_sem);
8feae131 DH	105	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
	106	vma = rb_entry(p, struct vm_area_struct, vm_rb);
	107	size += kobjsize(vma);
38f71479 DH	108	region = vma->vm_region;
	109	if (region) {
	110	size += kobjsize(region);
	111	size += region->vm_end - region->vm_start;
	112	}
1da177e4 LT	113	}
1da177e4 LT	114
7e1e0ef2 SM	115	*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
	116	>> PAGE_SHIFT;
	117	*data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
	118	>> PAGE_SHIFT;
1da177e4	119	up_read(&mm->mmap_sem);
7e1e0ef2 SM	120	size >>= PAGE_SHIFT;
7e1e0ef2 SM	121	size += text + data;
1da177e4 LT	122	*resident = size;
	123	return size;
	124	}
	125
58cb6548 ON	126	static pid_t pid_of_stack(struct proc_maps_private *priv,
	127	struct vm_area_struct *vma, bool is_pid)
	128	{
	129	struct inode *inode = priv->inode;
	130	struct task_struct *task;
	131	pid_t ret = 0;
	132
	133	rcu_read_lock();
	134	task = pid_task(proc_pid(inode), PIDTYPE_PID);
	135	if (task) {
	136	task = task_of_stack(task, vma, is_pid);
	137	if (task)
	138	ret = task_pid_nr_ns(task, inode->i_sb->s_fs_info);
	139	}
	140	rcu_read_unlock();
	141
	142	return ret;
	143	}
	144
8feae131 DH	145	/*
	146	* display a single VMA to a sequenced file
	147	*/
b7643757 SP	148	static int nommu_vma_show(struct seq_file m, struct vm_area_struct vma,
b7643757 SP	149	int is_pid)
8feae131	150	{
3c26c9d9	151	struct mm_struct *mm = vma->vm_mm;
b7643757	152	struct proc_maps_private *priv = m->private;
8feae131 DH	153	unsigned long ino = 0;
	154	struct file *file;
	155	dev_t dev = 0;
652586df	156	int flags;
6260a4b0	157	unsigned long long pgoff = 0;
8feae131 DH	158
	159	flags = vma->vm_flags;
	160	file = vma->vm_file;
	161
	162	if (file) {
496ad9aa	163	struct inode *inode = file_inode(vma->vm_file);
8feae131 DH	164	dev = inode->i_sb->s_dev;
8feae131 DH	165	ino = inode->i_ino;
4c967291	166	pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
8feae131 DH	167	}
8feae131 DH	168
652586df	169	seq_setwidth(m, 25 + sizeof(void ) 6 - 1);
8feae131	170	seq_printf(m,
652586df	171	"%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
8feae131 DH	172	vma->vm_start,
	173	vma->vm_end,
	174	flags & VM_READ ? 'r' : '-',
	175	flags & VM_WRITE ? 'w' : '-',
	176	flags & VM_EXEC ? 'x' : '-',
	177	flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
6260a4b0	178	pgoff,
652586df	179	MAJOR(dev), MINOR(dev), ino);
8feae131 DH	180
8feae131 DH	181	if (file) {
652586df	182	seq_pad(m, ' ');
2726d566	183	seq_file_path(m, file, "");
3c26c9d9	184	} else if (mm) {
58cb6548	185	pid_t tid = pid_of_stack(priv, vma, is_pid);
b7643757 SP	186
b7643757 SP	187	if (tid != 0) {
652586df	188	seq_pad(m, ' ');
b7643757 SP	189	/*
	190	* Thread stack in /proc/PID/task/TID/maps or
	191	* the main process stack.
	192	*/
	193	if (!is_pid \|\| (vma->vm_start <= mm->start_stack &&
	194	vma->vm_end >= mm->start_stack))
	195	seq_printf(m, "[stack]");
	196	else
	197	seq_printf(m, "[stack:%d]", tid);
3c26c9d9	198	}
8feae131 DH	199	}
	200
	201	seq_putc(m, '\n');
	202	return 0;
	203	}
	204
1da177e4	205	/*
dbf8685c	206	* display mapping lines for a particular process's /proc/pid/maps
1da177e4	207	*/
b7643757	208	static int show_map(struct seq_file m, void _p, int is_pid)
1da177e4	209	{
8feae131	210	struct rb_node *p = _p;
5096add8	211
b7643757 SP	212	return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
	213	is_pid);
	214	}
	215
	216	static int show_pid_map(struct seq_file m, void _p)
	217	{
	218	return show_map(m, _p, 1);
	219	}
	220
	221	static int show_tid_map(struct seq_file m, void _p)
	222	{
	223	return show_map(m, _p, 0);
1da177e4	224	}
dbf8685c	225
1da177e4 LT	226	static void m_start(struct seq_file m, loff_t *pos)
1da177e4 LT	227	{
dbf8685c	228	struct proc_maps_private *priv = m->private;
dbf8685c	229	struct mm_struct *mm;
8feae131	230	struct rb_node *p;
dbf8685c DH	231	loff_t n = *pos;
	232
	233	/* pin the task and mm whilst we play with them */
2c03376d	234	priv->task = get_proc_task(priv->inode);
dbf8685c	235	if (!priv->task)
ec6fd8a4	236	return ERR_PTR(-ESRCH);
dbf8685c	237
27692cd5	238	mm = priv->mm;
47fecca1	239	if (!mm \|\| !atomic_inc_not_zero(&mm->mm_users))
27692cd5	240	return NULL;
dbf8685c	241
47fecca1	242	down_read(&mm->mmap_sem);
dbf8685c	243	/* start from the Nth VMA */
8feae131	244	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
dbf8685c	245	if (n-- == 0)
8feae131	246	return p;
47fecca1 ON	247
	248	up_read(&mm->mmap_sem);
	249	mmput(mm);
1da177e4 LT	250	return NULL;
1da177e4 LT	251	}
dbf8685c DH	252
dbf8685c DH	253	static void m_stop(struct seq_file m, void _vml)
1da177e4	254	{
dbf8685c DH	255	struct proc_maps_private *priv = m->private;
dbf8685c DH	256
47fecca1 ON	257	if (!IS_ERR_OR_NULL(_vml)) {
	258	up_read(&priv->mm->mmap_sem);
	259	mmput(priv->mm);
	260	}
dbf8685c	261	if (priv->task) {
dbf8685c	262	put_task_struct(priv->task);
47fecca1	263	priv->task = NULL;
dbf8685c	264	}
1da177e4	265	}
dbf8685c	266
8feae131	267	static void m_next(struct seq_file m, void _p, loff_t pos)
1da177e4	268	{
8feae131	269	struct rb_node *p = _p;
dbf8685c DH	270
dbf8685c DH	271	(*pos)++;
8feae131	272	return p ? rb_next(p) : NULL;
1da177e4	273	}
dbf8685c	274
03a44825	275	static const struct seq_operations proc_pid_maps_ops = {
1da177e4 LT	276	.start = m_start,
	277	.next = m_next,
	278	.stop = m_stop,
b7643757 SP	279	.show = show_pid_map
	280	};
	281
	282	static const struct seq_operations proc_tid_maps_ops = {
	283	.start = m_start,
	284	.next = m_next,
	285	.stop = m_stop,
	286	.show = show_tid_map
1da177e4	287	};
662795de	288
b7643757 SP	289	static int maps_open(struct inode inode, struct file file,
b7643757 SP	290	const struct seq_operations *ops)
662795de	291	{
dbf8685c	292	struct proc_maps_private *priv;
ce34fddb	293
27692cd5	294	priv = __seq_open_private(file, ops, sizeof(*priv));
ce34fddb ON	295	if (!priv)
	296	return -ENOMEM;
	297
2c03376d	298	priv->inode = inode;
27692cd5 ON	299	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
	300	if (IS_ERR(priv->mm)) {
	301	int err = PTR_ERR(priv->mm);
	302
	303	seq_release_private(inode, file);
	304	return err;
	305	}
	306
ce34fddb	307	return 0;
662795de EB	308	}
662795de EB	309
27692cd5 ON	310
	311	static int map_release(struct inode inode, struct file file)
	312	{
	313	struct seq_file *seq = file->private_data;
	314	struct proc_maps_private *priv = seq->private;
	315
	316	if (priv->mm)
	317	mmdrop(priv->mm);
	318
	319	return seq_release_private(inode, file);
	320	}
	321
b7643757 SP	322	static int pid_maps_open(struct inode inode, struct file file)
	323	{
	324	return maps_open(inode, file, &proc_pid_maps_ops);
	325	}
	326
	327	static int tid_maps_open(struct inode inode, struct file file)
	328	{
	329	return maps_open(inode, file, &proc_tid_maps_ops);
	330	}
	331
	332	const struct file_operations proc_pid_maps_operations = {
	333	.open = pid_maps_open,
	334	.read = seq_read,
	335	.llseek = seq_lseek,
27692cd5	336	.release = map_release,
b7643757 SP	337	};
	338
	339	const struct file_operations proc_tid_maps_operations = {
	340	.open = tid_maps_open,
662795de EB	341	.read = seq_read,
662795de EB	342	.llseek = seq_lseek,
27692cd5	343	.release = map_release,
662795de EB	344	};
662795de EB	345