[mirror_ubuntu-bionic-kernel.git] / fs / notify / fdinfo.c

#include <linux/file.h>
#include <linux/fs.h>
#include <linux/fsnotify_backend.h>
#include <linux/idr.h>
#include <linux/init.h>
#include <linux/inotify.h>
#include <linux/fanotify.h>
#include <linux/kernel.h>
#include <linux/namei.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/exportfs.h>

#include "inotify/inotify.h"
#include "../fs/mount.h"

#if defined(CONFIG_PROC_FS)

#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)

static void show_fdinfo(struct seq_file *m, struct file *f,
			void (*show)(struct seq_file *m,
				     struct fsnotify_mark *mark))
{
	struct fsnotify_group *group = f->private_data;
	struct fsnotify_mark *mark;

	mutex_lock(&group->mark_mutex);
	list_for_each_entry(mark, &group->marks_list, g_list) {
		show(m, mark);
		if (seq_has_overflowed(m))
			break;
	}
	mutex_unlock(&group->mark_mutex);
}

#if defined(CONFIG_EXPORTFS)
static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
{
	struct {
		struct file_handle handle;
		u8 pad[MAX_HANDLE_SZ];
	} f;
	int size, ret, i;

	f.handle.handle_bytes = sizeof(f.pad);
	size = f.handle.handle_bytes >> 2;

	ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
	if ((ret == FILEID_INVALID) || (ret < 0)) {
		WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
		return;
	}

	f.handle.handle_type = ret;
	f.handle.handle_bytes = size * sizeof(u32);

	seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
		   f.handle.handle_bytes, f.handle.handle_type);

	for (i = 0; i < f.handle.handle_bytes; i++)
		seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
}
#else
static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
{
}
#endif

#ifdef CONFIG_INOTIFY_USER

static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
{
	struct inotify_inode_mark *inode_mark;
	struct inode *inode;

	if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE)))
		return;

	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
	inode = igrab(mark->inode);
	if (inode) {
		seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
			   inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
			   mark->mask, mark->ignored_mask);
		show_mark_fhandle(m, inode);
		seq_putc(m, '\n');
		iput(inode);
	}
}

void inotify_show_fdinfo(struct seq_file *m, struct file *f)
{
	show_fdinfo(m, f, inotify_fdinfo);
}

#endif /* CONFIG_INOTIFY_USER */

#ifdef CONFIG_FANOTIFY

static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
{
	unsigned int mflags = 0;
	struct inode *inode;

	if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
		return;

	if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
		mflags |= FAN_MARK_IGNORED_SURV_MODIFY;

	if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
		inode = igrab(mark->inode);
		if (!inode)
			return;
		seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
			   inode->i_ino, inode->i_sb->s_dev,
			   mflags, mark->mask, mark->ignored_mask);
		show_mark_fhandle(m, inode);
		seq_putc(m, '\n');
		iput(inode);
	} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
		struct mount *mnt = real_mount(mark->mnt);

		seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
			   mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
	}
}

void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
{
	struct fsnotify_group *group = f->private_data;
	unsigned int flags = 0;

	switch (group->priority) {
	case FS_PRIO_0:
		flags |= FAN_CLASS_NOTIF;
		break;
	case FS_PRIO_1:
		flags |= FAN_CLASS_CONTENT;
		break;
	case FS_PRIO_2:
		flags |= FAN_CLASS_PRE_CONTENT;
		break;
	}

	if (group->max_events == UINT_MAX)
		flags |= FAN_UNLIMITED_QUEUE;

	if (group->fanotify_data.max_marks == UINT_MAX)
		flags |= FAN_UNLIMITED_MARKS;

	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
		   flags, group->fanotify_data.f_flags);

	show_fdinfo(m, f, fanotify_fdinfo);
}

#endif /* CONFIG_FANOTIFY */

#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */

#endif /* CONFIG_PROC_FS */
Commit	Line	Data
be77196b CG	1	#include <linux/file.h>
	2	#include <linux/fs.h>
	3	#include <linux/fsnotify_backend.h>
	4	#include <linux/idr.h>
	5	#include <linux/init.h>
	6	#include <linux/inotify.h>
	7	#include <linux/fanotify.h>
	8	#include <linux/kernel.h>
	9	#include <linux/namei.h>
	10	#include <linux/sched.h>
	11	#include <linux/types.h>
	12	#include <linux/seq_file.h>
	13	#include <linux/proc_fs.h>
	14	#include <linux/exportfs.h>
	15
	16	#include "inotify/inotify.h"
	17	#include "../fs/mount.h"
	18
	19	#if defined(CONFIG_PROC_FS)
	20
	21	#if defined(CONFIG_INOTIFY_USER) \|\| defined(CONFIG_FANOTIFY)
	22
a3816ab0 JP	23	static void show_fdinfo(struct seq_file m, struct file f,
	24	void (show)(struct seq_file m,
	25	struct fsnotify_mark *mark))
be77196b CG	26	{
	27	struct fsnotify_group *group = f->private_data;
	28	struct fsnotify_mark *mark;
be77196b	29
96680d2b	30	mutex_lock(&group->mark_mutex);
be77196b	31	list_for_each_entry(mark, &group->marks_list, g_list) {
a3816ab0 JP	32	show(m, mark);
a3816ab0 JP	33	if (seq_has_overflowed(m))
be77196b CG	34	break;
be77196b CG	35	}
96680d2b	36	mutex_unlock(&group->mark_mutex);
be77196b CG	37	}
	38
	39	#if defined(CONFIG_EXPORTFS)
a3816ab0	40	static void show_mark_fhandle(struct seq_file m, struct inode inode)
be77196b CG	41	{
	42	struct {
	43	struct file_handle handle;
1fc98d11	44	u8 pad[MAX_HANDLE_SZ];
be77196b CG	45	} f;
	46	int size, ret, i;
	47
	48	f.handle.handle_bytes = sizeof(f.pad);
	49	size = f.handle.handle_bytes >> 2;
	50
	51	ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
7e882481	52	if ((ret == FILEID_INVALID) \|\| (ret < 0)) {
be77196b	53	WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
a3816ab0	54	return;
be77196b CG	55	}
	56
	57	f.handle.handle_type = ret;
	58	f.handle.handle_bytes = size * sizeof(u32);
	59
a3816ab0 JP	60	seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
a3816ab0 JP	61	f.handle.handle_bytes, f.handle.handle_type);
be77196b CG	62
be77196b CG	63	for (i = 0; i < f.handle.handle_bytes; i++)
a3816ab0	64	seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
be77196b CG	65	}
be77196b CG	66	#else
a3816ab0	67	static void show_mark_fhandle(struct seq_file m, struct inode inode)
be77196b	68	{
be77196b CG	69	}
	70	#endif
	71
	72	#ifdef CONFIG_INOTIFY_USER
	73
a3816ab0	74	static void inotify_fdinfo(struct seq_file m, struct fsnotify_mark mark)
be77196b CG	75	{
	76	struct inotify_inode_mark *inode_mark;
	77	struct inode *inode;
be77196b CG	78
be77196b CG	79	if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE \| FSNOTIFY_MARK_FLAG_INODE)))
a3816ab0	80	return;
be77196b CG	81
be77196b CG	82	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
0809ab69	83	inode = igrab(mark->inode);
be77196b	84	if (inode) {
a3816ab0 JP	85	seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
	86	inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
	87	mark->mask, mark->ignored_mask);
	88	show_mark_fhandle(m, inode);
	89	seq_putc(m, '\n');
be77196b CG	90	iput(inode);
be77196b CG	91	}
be77196b CG	92	}
be77196b CG	93
a3816ab0	94	void inotify_show_fdinfo(struct seq_file m, struct file f)
be77196b	95	{
a3816ab0	96	show_fdinfo(m, f, inotify_fdinfo);
be77196b CG	97	}
	98
	99	#endif /* CONFIG_INOTIFY_USER */
	100
	101	#ifdef CONFIG_FANOTIFY
	102
a3816ab0	103	static void fanotify_fdinfo(struct seq_file m, struct fsnotify_mark mark)
be77196b	104	{
e6dbcafb	105	unsigned int mflags = 0;
be77196b	106	struct inode *inode;
be77196b CG	107
be77196b CG	108	if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
a3816ab0	109	return;
be77196b	110
e6dbcafb CG	111	if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
	112	mflags \|= FAN_MARK_IGNORED_SURV_MODIFY;
	113
be77196b	114	if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
0809ab69	115	inode = igrab(mark->inode);
be77196b	116	if (!inode)
a3816ab0 JP	117	return;
	118	seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
	119	inode->i_ino, inode->i_sb->s_dev,
	120	mflags, mark->mask, mark->ignored_mask);
	121	show_mark_fhandle(m, inode);
	122	seq_putc(m, '\n');
be77196b CG	123	iput(inode);
be77196b CG	124	} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
0809ab69	125	struct mount *mnt = real_mount(mark->mnt);
be77196b	126
a3816ab0 JP	127	seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
a3816ab0 JP	128	mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
be77196b	129	}
be77196b CG	130	}
be77196b CG	131
a3816ab0	132	void fanotify_show_fdinfo(struct seq_file m, struct file f)
be77196b CG	133	{
	134	struct fsnotify_group *group = f->private_data;
	135	unsigned int flags = 0;
	136
	137	switch (group->priority) {
	138	case FS_PRIO_0:
	139	flags \|= FAN_CLASS_NOTIF;
	140	break;
	141	case FS_PRIO_1:
	142	flags \|= FAN_CLASS_CONTENT;
	143	break;
	144	case FS_PRIO_2:
	145	flags \|= FAN_CLASS_PRE_CONTENT;
	146	break;
	147	}
	148
	149	if (group->max_events == UINT_MAX)
	150	flags \|= FAN_UNLIMITED_QUEUE;
	151
	152	if (group->fanotify_data.max_marks == UINT_MAX)
	153	flags \|= FAN_UNLIMITED_MARKS;
	154
	155	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
	156	flags, group->fanotify_data.f_flags);
	157
a3816ab0	158	show_fdinfo(m, f, fanotify_fdinfo);
be77196b CG	159	}
	160
	161	#endif /* CONFIG_FANOTIFY */
	162
	163	#endif /* CONFIG_INOTIFY_USER \|\| CONFIG_FANOTIFY */
	164
	165	#endif /* CONFIG_PROC_FS */