[linux-block.git] / fs / notify / fdinfo.c

// SPDX-License-Identifier: GPL-2.0
#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/exportfs.h>

#include "inotify/inotify.h"
#include "fdinfo.h"
#include "fsnotify.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, NULL);
	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->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
		return;

	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
	inode = igrab(fsnotify_conn_inode(mark->connector));
	if (inode) {
		/*
		 * IN_ALL_EVENTS represents all of the mask bits
		 * that we expose to userspace.  There is at
		 * least one bit (FS_EVENT_ON_CHILD) which is
		 * used only internally to the kernel.
		 */
		u32 mask = mark->mask & IN_ALL_EVENTS;
		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,
			   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_IGNORED_SURV_MODIFY)
		mflags |= FAN_MARK_IGNORED_SURV_MODIFY;

	if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
		inode = igrab(fsnotify_conn_inode(mark->connector));
		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->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
		struct mount *mnt = fsnotify_conn_mount(mark->connector);

		seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
			   mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
		struct super_block *sb = fsnotify_conn_sb(mark->connector);

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

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

	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
		   group->fanotify_data.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
	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/file.h>
	3	#include <linux/fs.h>
	4	#include <linux/fsnotify_backend.h>
	5	#include <linux/idr.h>
	6	#include <linux/init.h>
	7	#include <linux/inotify.h>
	8	#include <linux/fanotify.h>
	9	#include <linux/kernel.h>
	10	#include <linux/namei.h>
	11	#include <linux/sched.h>
	12	#include <linux/types.h>
	13	#include <linux/seq_file.h>
	14	#include <linux/exportfs.h>
	15
	16	#include "inotify/inotify.h"
	17	#include "fdinfo.h"
	18	#include "fsnotify.h"
	19
	20	#if defined(CONFIG_PROC_FS)
	21
	22	#if defined(CONFIG_INOTIFY_USER) \|\| defined(CONFIG_FANOTIFY)
	23
	24	static void show_fdinfo(struct seq_file m, struct file f,
	25	void (show)(struct seq_file m,
	26	struct fsnotify_mark *mark))
	27	{
	28	struct fsnotify_group *group = f->private_data;
	29	struct fsnotify_mark *mark;
	30
	31	mutex_lock(&group->mark_mutex);
	32	list_for_each_entry(mark, &group->marks_list, g_list) {
	33	show(m, mark);
	34	if (seq_has_overflowed(m))
	35	break;
	36	}
	37	mutex_unlock(&group->mark_mutex);
	38	}
	39
	40	#if defined(CONFIG_EXPORTFS)
	41	static void show_mark_fhandle(struct seq_file m, struct inode inode)
	42	{
	43	struct {
	44	struct file_handle handle;
	45	u8 pad[MAX_HANDLE_SZ];
	46	} f;
	47	int size, ret, i;
	48
	49	f.handle.handle_bytes = sizeof(f.pad);
	50	size = f.handle.handle_bytes >> 2;
	51
	52	ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, NULL);
	53	if ((ret == FILEID_INVALID) \|\| (ret < 0)) {
	54	WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
	55	return;
	56	}
	57
	58	f.handle.handle_type = ret;
	59	f.handle.handle_bytes = size * sizeof(u32);
	60
	61	seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
	62	f.handle.handle_bytes, f.handle.handle_type);
	63
	64	for (i = 0; i < f.handle.handle_bytes; i++)
	65	seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
	66	}
	67	#else
	68	static void show_mark_fhandle(struct seq_file m, struct inode inode)
	69	{
	70	}
	71	#endif
	72
	73	#ifdef CONFIG_INOTIFY_USER
	74
	75	static void inotify_fdinfo(struct seq_file m, struct fsnotify_mark mark)
	76	{
	77	struct inotify_inode_mark *inode_mark;
	78	struct inode *inode;
	79
	80	if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
	81	return;
	82
	83	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
	84	inode = igrab(fsnotify_conn_inode(mark->connector));
	85	if (inode) {
	86	/*
	87	* IN_ALL_EVENTS represents all of the mask bits
	88	* that we expose to userspace. There is at
	89	* least one bit (FS_EVENT_ON_CHILD) which is
	90	* used only internally to the kernel.
	91	*/
	92	u32 mask = mark->mask & IN_ALL_EVENTS;
	93	seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
	94	inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
	95	mask, mark->ignored_mask);
	96	show_mark_fhandle(m, inode);
	97	seq_putc(m, '\n');
	98	iput(inode);
	99	}
	100	}
	101
	102	void inotify_show_fdinfo(struct seq_file m, struct file f)
	103	{
	104	show_fdinfo(m, f, inotify_fdinfo);
	105	}
	106
	107	#endif /* CONFIG_INOTIFY_USER */
	108
	109	#ifdef CONFIG_FANOTIFY
	110
	111	static void fanotify_fdinfo(struct seq_file m, struct fsnotify_mark mark)
	112	{
	113	unsigned int mflags = 0;
	114	struct inode *inode;
	115
	116	if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
	117	mflags \|= FAN_MARK_IGNORED_SURV_MODIFY;
	118
	119	if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
	120	inode = igrab(fsnotify_conn_inode(mark->connector));
	121	if (!inode)
	122	return;
	123	seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
	124	inode->i_ino, inode->i_sb->s_dev,
	125	mflags, mark->mask, mark->ignored_mask);
	126	show_mark_fhandle(m, inode);
	127	seq_putc(m, '\n');
	128	iput(inode);
	129	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
	130	struct mount *mnt = fsnotify_conn_mount(mark->connector);
	131
	132	seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
	133	mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
	134	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
	135	struct super_block *sb = fsnotify_conn_sb(mark->connector);
	136
	137	seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
	138	sb->s_dev, mflags, mark->mask, mark->ignored_mask);
	139	}
	140	}
	141
	142	void fanotify_show_fdinfo(struct seq_file m, struct file f)
	143	{
	144	struct fsnotify_group *group = f->private_data;
	145
	146	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
	147	group->fanotify_data.flags, group->fanotify_data.f_flags);
	148
	149	show_fdinfo(m, f, fanotify_fdinfo);
	150	}
	151
	152	#endif /* CONFIG_FANOTIFY */
	153
	154	#endif /* CONFIG_INOTIFY_USER \|\| CONFIG_FANOTIFY */
	155
	156	#endif /* CONFIG_PROC_FS */