[linux.git] / fs / proc_namespace.c

// SPDX-License-Identifier: GPL-2.0
/*
 * fs/proc_namespace.c - handling of /proc/<pid>/{mounts,mountinfo,mountstats}
 *
 * In fact, that's a piece of procfs; it's *almost* isolated from
 * the rest of fs/proc, but has rather close relationships with
 * fs/namespace.c, thus here instead of fs/proc
 *
 */
#include <linux/mnt_namespace.h>
#include <linux/nsproxy.h>
#include <linux/security.h>
#include <linux/fs_struct.h>
#include <linux/sched/task.h>

#include "proc/internal.h" /* only for get_proc_task() in ->open() */

#include "pnode.h"
#include "internal.h"

static __poll_t mounts_poll(struct file *file, poll_table *wait)
{
	struct seq_file *m = file->private_data;
	struct proc_mounts *p = m->private;
	struct mnt_namespace *ns = p->ns;
	__poll_t res = EPOLLIN | EPOLLRDNORM;
	int event;

	poll_wait(file, &p->ns->poll, wait);

	event = READ_ONCE(ns->event);
	if (m->poll_event != event) {
		m->poll_event = event;
		res |= EPOLLERR | EPOLLPRI;
	}

	return res;
}

struct proc_fs_opts {
	int flag;
	const char *str;
};

static int show_sb_opts(struct seq_file *m, struct super_block *sb)
{
	static const struct proc_fs_opts fs_opts[] = {
		{ SB_SYNCHRONOUS, ",sync" },
		{ SB_DIRSYNC, ",dirsync" },
		{ SB_MANDLOCK, ",mand" },
		{ SB_LAZYTIME, ",lazytime" },
		{ 0, NULL }
	};
	const struct proc_fs_opts *fs_infop;

	for (fs_infop = fs_opts; fs_infop->flag; fs_infop++) {
		if (sb->s_flags & fs_infop->flag)
			seq_puts(m, fs_infop->str);
	}

	return security_sb_show_options(m, sb);
}

static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt)
{
	static const struct proc_fs_opts mnt_opts[] = {
		{ MNT_NOSUID, ",nosuid" },
		{ MNT_NODEV, ",nodev" },
		{ MNT_NOEXEC, ",noexec" },
		{ MNT_NOATIME, ",noatime" },
		{ MNT_NODIRATIME, ",nodiratime" },
		{ MNT_RELATIME, ",relatime" },
		{ MNT_NOSYMFOLLOW, ",nosymfollow" },
		{ 0, NULL }
	};
	const struct proc_fs_opts *fs_infop;

	for (fs_infop = mnt_opts; fs_infop->flag; fs_infop++) {
		if (mnt->mnt_flags & fs_infop->flag)
			seq_puts(m, fs_infop->str);
	}
}

static inline void mangle(struct seq_file *m, const char *s)
{
	seq_escape(m, s, " \t\n\\");
}

static void show_type(struct seq_file *m, struct super_block *sb)
{
	mangle(m, sb->s_type->name);
	if (sb->s_subtype) {
		seq_putc(m, '.');
		mangle(m, sb->s_subtype);
	}
}

static int show_vfsmnt(struct seq_file *m, struct vfsmount *mnt)
{
	struct proc_mounts *p = m->private;
	struct mount *r = real_mount(mnt);
	struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
	struct super_block *sb = mnt_path.dentry->d_sb;
	int err;

	if (sb->s_op->show_devname) {
		err = sb->s_op->show_devname(m, mnt_path.dentry);
		if (err)
			goto out;
	} else {
		mangle(m, r->mnt_devname ? r->mnt_devname : "none");
	}
	seq_putc(m, ' ');
	/* mountpoints outside of chroot jail will give SEQ_SKIP on this */
	err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
	if (err)
		goto out;
	seq_putc(m, ' ');
	show_type(m, sb);
	seq_puts(m, __mnt_is_readonly(mnt) ? " ro" : " rw");
	err = show_sb_opts(m, sb);
	if (err)
		goto out;
	show_mnt_opts(m, mnt);
	if (sb->s_op->show_options)
		err = sb->s_op->show_options(m, mnt_path.dentry);
	seq_puts(m, " 0 0\n");
out:
	return err;
}

static int show_mountinfo(struct seq_file *m, struct vfsmount *mnt)
{
	struct proc_mounts *p = m->private;
	struct mount *r = real_mount(mnt);
	struct super_block *sb = mnt->mnt_sb;
	struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
	int err;

	seq_printf(m, "%i %i %u:%u ", r->mnt_id, r->mnt_parent->mnt_id,
		   MAJOR(sb->s_dev), MINOR(sb->s_dev));
	if (sb->s_op->show_path) {
		err = sb->s_op->show_path(m, mnt->mnt_root);
		if (err)
			goto out;
	} else {
		seq_dentry(m, mnt->mnt_root, " \t\n\\");
	}
	seq_putc(m, ' ');

	/* mountpoints outside of chroot jail will give SEQ_SKIP on this */
	err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
	if (err)
		goto out;

	seq_puts(m, mnt->mnt_flags & MNT_READONLY ? " ro" : " rw");
	show_mnt_opts(m, mnt);

	/* Tagged fields ("foo:X" or "bar") */
	if (IS_MNT_SHARED(r))
		seq_printf(m, " shared:%i", r->mnt_group_id);
	if (IS_MNT_SLAVE(r)) {
		int master = r->mnt_master->mnt_group_id;
		int dom = get_dominating_id(r, &p->root);
		seq_printf(m, " master:%i", master);
		if (dom && dom != master)
			seq_printf(m, " propagate_from:%i", dom);
	}
	if (IS_MNT_UNBINDABLE(r))
		seq_puts(m, " unbindable");

	/* Filesystem specific data */
	seq_puts(m, " - ");
	show_type(m, sb);
	seq_putc(m, ' ');
	if (sb->s_op->show_devname) {
		err = sb->s_op->show_devname(m, mnt->mnt_root);
		if (err)
			goto out;
	} else {
		mangle(m, r->mnt_devname ? r->mnt_devname : "none");
	}
	seq_puts(m, sb_rdonly(sb) ? " ro" : " rw");
	err = show_sb_opts(m, sb);
	if (err)
		goto out;
	if (sb->s_op->show_options)
		err = sb->s_op->show_options(m, mnt->mnt_root);
	seq_putc(m, '\n');
out:
	return err;
}

static int show_vfsstat(struct seq_file *m, struct vfsmount *mnt)
{
	struct proc_mounts *p = m->private;
	struct mount *r = real_mount(mnt);
	struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
	struct super_block *sb = mnt_path.dentry->d_sb;
	int err;

	/* device */
	if (sb->s_op->show_devname) {
		seq_puts(m, "device ");
		err = sb->s_op->show_devname(m, mnt_path.dentry);
		if (err)
			goto out;
	} else {
		if (r->mnt_devname) {
			seq_puts(m, "device ");
			mangle(m, r->mnt_devname);
		} else
			seq_puts(m, "no device");
	}

	/* mount point */
	seq_puts(m, " mounted on ");
	/* mountpoints outside of chroot jail will give SEQ_SKIP on this */
	err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
	if (err)
		goto out;
	seq_putc(m, ' ');

	/* file system type */
	seq_puts(m, "with fstype ");
	show_type(m, sb);

	/* optional statistics */
	if (sb->s_op->show_stats) {
		seq_putc(m, ' ');
		err = sb->s_op->show_stats(m, mnt_path.dentry);
	}

	seq_putc(m, '\n');
out:
	return err;
}

static int mounts_open_common(struct inode *inode, struct file *file,
			      int (*show)(struct seq_file *, struct vfsmount *))
{
	struct task_struct *task = get_proc_task(inode);
	struct nsproxy *nsp;
	struct mnt_namespace *ns = NULL;
	struct path root;
	struct proc_mounts *p;
	struct seq_file *m;
	int ret = -EINVAL;

	if (!task)
		goto err;

	task_lock(task);
	nsp = task->nsproxy;
	if (!nsp || !nsp->mnt_ns) {
		task_unlock(task);
		put_task_struct(task);
		goto err;
	}
	ns = nsp->mnt_ns;
	get_mnt_ns(ns);
	if (!task->fs) {
		task_unlock(task);
		put_task_struct(task);
		ret = -ENOENT;
		goto err_put_ns;
	}
	get_fs_root(task->fs, &root);
	task_unlock(task);
	put_task_struct(task);

	ret = seq_open_private(file, &mounts_op, sizeof(struct proc_mounts));
	if (ret)
		goto err_put_path;

	m = file->private_data;
	m->poll_event = ns->event;

	p = m->private;
	p->ns = ns;
	p->root = root;
	p->show = show;
	INIT_LIST_HEAD(&p->cursor.mnt_list);
	p->cursor.mnt.mnt_flags = MNT_CURSOR;

	return 0;

 err_put_path:
	path_put(&root);
 err_put_ns:
	put_mnt_ns(ns);
 err:
	return ret;
}

static int mounts_release(struct inode *inode, struct file *file)
{
	struct seq_file *m = file->private_data;
	struct proc_mounts *p = m->private;
	path_put(&p->root);
	mnt_cursor_del(p->ns, &p->cursor);
	put_mnt_ns(p->ns);
	return seq_release_private(inode, file);
}

static int mounts_open(struct inode *inode, struct file *file)
{
	return mounts_open_common(inode, file, show_vfsmnt);
}

static int mountinfo_open(struct inode *inode, struct file *file)
{
	return mounts_open_common(inode, file, show_mountinfo);
}

static int mountstats_open(struct inode *inode, struct file *file)
{
	return mounts_open_common(inode, file, show_vfsstat);
}

const struct file_operations proc_mounts_operations = {
	.open		= mounts_open,
	.read_iter	= seq_read_iter,
	.splice_read	= generic_file_splice_read,
	.llseek		= seq_lseek,
	.release	= mounts_release,
	.poll		= mounts_poll,
};

const struct file_operations proc_mountinfo_operations = {
	.open		= mountinfo_open,
	.read_iter	= seq_read_iter,
	.splice_read	= generic_file_splice_read,
	.llseek		= seq_lseek,
	.release	= mounts_release,
	.poll		= mounts_poll,
};

const struct file_operations proc_mountstats_operations = {
	.open		= mountstats_open,
	.read_iter	= seq_read_iter,
	.splice_read	= generic_file_splice_read,
	.llseek		= seq_lseek,
	.release	= mounts_release,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
0226f492 AV	2	/*
	3	* fs/proc_namespace.c - handling of /proc/<pid>/{mounts,mountinfo,mountstats}
	4	*
	5	* In fact, that's a piece of procfs; it's almost isolated from
	6	* the rest of fs/proc, but has rather close relationships with
	7	* fs/namespace.c, thus here instead of fs/proc
	8	*
	9	*/
	10	#include <linux/mnt_namespace.h>
	11	#include <linux/nsproxy.h>
	12	#include <linux/security.h>
	13	#include <linux/fs_struct.h>
f719ff9b IM	14	#include <linux/sched/task.h>
f719ff9b IM	15
0226f492 AV	16	#include "proc/internal.h" /* only for get_proc_task() in ->open() */
	17
	18	#include "pnode.h"
	19	#include "internal.h"
	20
076ccb76	21	static __poll_t mounts_poll(struct file file, poll_table wait)
0226f492	22	{
ede1bf0d YD	23	struct seq_file *m = file->private_data;
ede1bf0d YD	24	struct proc_mounts *p = m->private;
0226f492	25	struct mnt_namespace *ns = p->ns;
a9a08845	26	__poll_t res = EPOLLIN \| EPOLLRDNORM;
aab407fc	27	int event;
0226f492 AV	28
	29	poll_wait(file, &p->ns->poll, wait);
	30
6aa7de05	31	event = READ_ONCE(ns->event);
ede1bf0d YD	32	if (m->poll_event != event) {
ede1bf0d YD	33	m->poll_event = event;
a9a08845	34	res \|= EPOLLERR \| EPOLLPRI;
0226f492	35	}
0226f492 AV	36
	37	return res;
	38	}
	39
1e88c420	40	struct proc_fs_opts {
0226f492 AV	41	int flag;
	42	const char *str;
	43	};
	44
	45	static int show_sb_opts(struct seq_file m, struct super_block sb)
	46	{
1e88c420	47	static const struct proc_fs_opts fs_opts[] = {
1751e8a6 LT	48	{ SB_SYNCHRONOUS, ",sync" },
	49	{ SB_DIRSYNC, ",dirsync" },
	50	{ SB_MANDLOCK, ",mand" },
	51	{ SB_LAZYTIME, ",lazytime" },
0226f492 AV	52	{ 0, NULL }
0226f492 AV	53	};
1e88c420	54	const struct proc_fs_opts *fs_infop;
0226f492	55
1e88c420	56	for (fs_infop = fs_opts; fs_infop->flag; fs_infop++) {
0226f492 AV	57	if (sb->s_flags & fs_infop->flag)
	58	seq_puts(m, fs_infop->str);
	59	}
	60
	61	return security_sb_show_options(m, sb);
	62	}
	63
	64	static void show_mnt_opts(struct seq_file m, struct vfsmount mnt)
	65	{
1e88c420	66	static const struct proc_fs_opts mnt_opts[] = {
0226f492 AV	67	{ MNT_NOSUID, ",nosuid" },
	68	{ MNT_NODEV, ",nodev" },
	69	{ MNT_NOEXEC, ",noexec" },
	70	{ MNT_NOATIME, ",noatime" },
	71	{ MNT_NODIRATIME, ",nodiratime" },
	72	{ MNT_RELATIME, ",relatime" },
dab741e0	73	{ MNT_NOSYMFOLLOW, ",nosymfollow" },
0226f492 AV	74	{ 0, NULL }
0226f492 AV	75	};
1e88c420	76	const struct proc_fs_opts *fs_infop;
0226f492	77
1e88c420	78	for (fs_infop = mnt_opts; fs_infop->flag; fs_infop++) {
0226f492 AV	79	if (mnt->mnt_flags & fs_infop->flag)
	80	seq_puts(m, fs_infop->str);
	81	}
	82	}
	83
	84	static inline void mangle(struct seq_file m, const char s)
	85	{
	86	seq_escape(m, s, " \t\n\\");
	87	}
	88
	89	static void show_type(struct seq_file m, struct super_block sb)
	90	{
	91	mangle(m, sb->s_type->name);
c7eb6869	92	if (sb->s_subtype) {
0226f492 AV	93	seq_putc(m, '.');
	94	mangle(m, sb->s_subtype);
	95	}
	96	}
	97
	98	static int show_vfsmnt(struct seq_file m, struct vfsmount mnt)
	99	{
ede1bf0d	100	struct proc_mounts *p = m->private;
0226f492	101	struct mount *r = real_mount(mnt);
0226f492	102	struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
d861c630	103	struct super_block *sb = mnt_path.dentry->d_sb;
5d9f3c7b	104	int err;
0226f492	105
d861c630 AV	106	if (sb->s_op->show_devname) {
d861c630 AV	107	err = sb->s_op->show_devname(m, mnt_path.dentry);
0226f492 AV	108	if (err)
	109	goto out;
	110	} else {
	111	mangle(m, r->mnt_devname ? r->mnt_devname : "none");
	112	}
	113	seq_putc(m, ' ');
9d4d6574 DL	114	/* mountpoints outside of chroot jail will give SEQ_SKIP on this */
	115	err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
	116	if (err)
	117	goto out;
0226f492	118	seq_putc(m, ' ');
d861c630	119	show_type(m, sb);
0226f492	120	seq_puts(m, __mnt_is_readonly(mnt) ? " ro" : " rw");
d861c630	121	err = show_sb_opts(m, sb);
0226f492 AV	122	if (err)
	123	goto out;
	124	show_mnt_opts(m, mnt);
d861c630	125	if (sb->s_op->show_options)
34c80b1d	126	err = sb->s_op->show_options(m, mnt_path.dentry);
0226f492 AV	127	seq_puts(m, " 0 0\n");
	128	out:
	129	return err;
	130	}
	131
	132	static int show_mountinfo(struct seq_file m, struct vfsmount mnt)
	133	{
ede1bf0d	134	struct proc_mounts *p = m->private;
0226f492 AV	135	struct mount *r = real_mount(mnt);
	136	struct super_block *sb = mnt->mnt_sb;
	137	struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
6ce4bca0	138	int err;
0226f492 AV	139
	140	seq_printf(m, "%i %i %u:%u ", r->mnt_id, r->mnt_parent->mnt_id,
	141	MAJOR(sb->s_dev), MINOR(sb->s_dev));
6ce4bca0	142	if (sb->s_op->show_path) {
a6322de6	143	err = sb->s_op->show_path(m, mnt->mnt_root);
6ce4bca0 DL	144	if (err)
	145	goto out;
	146	} else {
0226f492	147	seq_dentry(m, mnt->mnt_root, " \t\n\\");
6ce4bca0	148	}
0226f492 AV	149	seq_putc(m, ' ');
	150
	151	/* mountpoints outside of chroot jail will give SEQ_SKIP on this */
9ad4dc4f	152	err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
0226f492 AV	153	if (err)
	154	goto out;
	155
	156	seq_puts(m, mnt->mnt_flags & MNT_READONLY ? " ro" : " rw");
	157	show_mnt_opts(m, mnt);
	158
	159	/* Tagged fields ("foo:X" or "bar") */
	160	if (IS_MNT_SHARED(r))
	161	seq_printf(m, " shared:%i", r->mnt_group_id);
	162	if (IS_MNT_SLAVE(r)) {
	163	int master = r->mnt_master->mnt_group_id;
	164	int dom = get_dominating_id(r, &p->root);
	165	seq_printf(m, " master:%i", master);
	166	if (dom && dom != master)
	167	seq_printf(m, " propagate_from:%i", dom);
	168	}
	169	if (IS_MNT_UNBINDABLE(r))
	170	seq_puts(m, " unbindable");
	171
	172	/* Filesystem specific data */
	173	seq_puts(m, " - ");
	174	show_type(m, sb);
	175	seq_putc(m, ' ');
6ce4bca0	176	if (sb->s_op->show_devname) {
d861c630	177	err = sb->s_op->show_devname(m, mnt->mnt_root);
6ce4bca0 DL	178	if (err)
	179	goto out;
	180	} else {
0226f492	181	mangle(m, r->mnt_devname ? r->mnt_devname : "none");
6ce4bca0	182	}
bc98a42c	183	seq_puts(m, sb_rdonly(sb) ? " ro" : " rw");
0226f492 AV	184	err = show_sb_opts(m, sb);
	185	if (err)
	186	goto out;
	187	if (sb->s_op->show_options)
34c80b1d	188	err = sb->s_op->show_options(m, mnt->mnt_root);
0226f492 AV	189	seq_putc(m, '\n');
	190	out:
	191	return err;
	192	}
	193
	194	static int show_vfsstat(struct seq_file m, struct vfsmount mnt)
	195	{
ede1bf0d	196	struct proc_mounts *p = m->private;
0226f492 AV	197	struct mount *r = real_mount(mnt);
0226f492 AV	198	struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
64132379	199	struct super_block *sb = mnt_path.dentry->d_sb;
b896fb35	200	int err;
0226f492 AV	201
0226f492 AV	202	/* device */
64132379	203	if (sb->s_op->show_devname) {
0226f492	204	seq_puts(m, "device ");
d861c630	205	err = sb->s_op->show_devname(m, mnt_path.dentry);
5f8d498d DL	206	if (err)
5f8d498d DL	207	goto out;
0226f492 AV	208	} else {
	209	if (r->mnt_devname) {
	210	seq_puts(m, "device ");
	211	mangle(m, r->mnt_devname);
	212	} else
	213	seq_puts(m, "no device");
	214	}
	215
	216	/* mount point */
	217	seq_puts(m, " mounted on ");
9d4d6574 DL	218	/* mountpoints outside of chroot jail will give SEQ_SKIP on this */
	219	err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
	220	if (err)
	221	goto out;
0226f492 AV	222	seq_putc(m, ' ');
	223
	224	/* file system type */
	225	seq_puts(m, "with fstype ");
64132379	226	show_type(m, sb);
0226f492 AV	227
0226f492 AV	228	/* optional statistics */
64132379	229	if (sb->s_op->show_stats) {
0226f492	230	seq_putc(m, ' ');
b896fb35	231	err = sb->s_op->show_stats(m, mnt_path.dentry);
0226f492 AV	232	}
	233
	234	seq_putc(m, '\n');
9d4d6574	235	out:
0226f492 AV	236	return err;
	237	}
	238
	239	static int mounts_open_common(struct inode inode, struct file file,
	240	int (show)(struct seq_file , struct vfsmount *))
	241	{
	242	struct task_struct *task = get_proc_task(inode);
	243	struct nsproxy *nsp;
	244	struct mnt_namespace *ns = NULL;
	245	struct path root;
	246	struct proc_mounts *p;
ede1bf0d	247	struct seq_file *m;
0226f492 AV	248	int ret = -EINVAL;
	249
	250	if (!task)
	251	goto err;
	252
728dba3a EB	253	task_lock(task);
728dba3a EB	254	nsp = task->nsproxy;
3d93116c	255	if (!nsp \|\| !nsp->mnt_ns) {
728dba3a	256	task_unlock(task);
0226f492 AV	257	put_task_struct(task);
	258	goto err;
	259	}
	260	ns = nsp->mnt_ns;
0226f492	261	get_mnt_ns(ns);
0226f492 AV	262	if (!task->fs) {
	263	task_unlock(task);
	264	put_task_struct(task);
	265	ret = -ENOENT;
	266	goto err_put_ns;
	267	}
	268	get_fs_root(task->fs, &root);
	269	task_unlock(task);
	270	put_task_struct(task);
	271
ede1bf0d YD	272	ret = seq_open_private(file, &mounts_op, sizeof(struct proc_mounts));
ede1bf0d YD	273	if (ret)
0226f492 AV	274	goto err_put_path;
0226f492 AV	275
ede1bf0d YD	276	m = file->private_data;
ede1bf0d YD	277	m->poll_event = ns->event;
0226f492	278
ede1bf0d	279	p = m->private;
0226f492 AV	280	p->ns = ns;
0226f492 AV	281	p->root = root;
0226f492	282	p->show = show;
9f6c61f9 MS	283	INIT_LIST_HEAD(&p->cursor.mnt_list);
9f6c61f9 MS	284	p->cursor.mnt.mnt_flags = MNT_CURSOR;
0226f492 AV	285
	286	return 0;
	287
0226f492 AV	288	err_put_path:
	289	path_put(&root);
	290	err_put_ns:
	291	put_mnt_ns(ns);
	292	err:
	293	return ret;
	294	}
	295
	296	static int mounts_release(struct inode inode, struct file file)
	297	{
ede1bf0d YD	298	struct seq_file *m = file->private_data;
ede1bf0d YD	299	struct proc_mounts *p = m->private;
0226f492	300	path_put(&p->root);
9f6c61f9	301	mnt_cursor_del(p->ns, &p->cursor);
0226f492	302	put_mnt_ns(p->ns);
ede1bf0d	303	return seq_release_private(inode, file);
0226f492 AV	304	}
	305
	306	static int mounts_open(struct inode inode, struct file file)
	307	{
	308	return mounts_open_common(inode, file, show_vfsmnt);
	309	}
	310
	311	static int mountinfo_open(struct inode inode, struct file file)
	312	{
	313	return mounts_open_common(inode, file, show_mountinfo);
	314	}
	315
	316	static int mountstats_open(struct inode inode, struct file file)
	317	{
	318	return mounts_open_common(inode, file, show_vfsstat);
	319	}
	320
	321	const struct file_operations proc_mounts_operations = {
	322	.open = mounts_open,
14e3e989 LT	323	.read_iter = seq_read_iter,
14e3e989 LT	324	.splice_read = generic_file_splice_read,
0226f492 AV	325	.llseek = seq_lseek,
	326	.release = mounts_release,
	327	.poll = mounts_poll,
	328	};
	329
	330	const struct file_operations proc_mountinfo_operations = {
	331	.open = mountinfo_open,
14e3e989 LT	332	.read_iter = seq_read_iter,
14e3e989 LT	333	.splice_read = generic_file_splice_read,
0226f492 AV	334	.llseek = seq_lseek,
	335	.release = mounts_release,
	336	.poll = mounts_poll,
	337	};
	338
	339	const struct file_operations proc_mountstats_operations = {
	340	.open = mountstats_open,
14e3e989 LT	341	.read_iter = seq_read_iter,
14e3e989 LT	342	.splice_read = generic_file_splice_read,
0226f492 AV	343	.llseek = seq_lseek,
	344	.release = mounts_release,
	345	};