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 "fanotify/fanotify.h"
18#include "fdinfo.h"
19#include "fsnotify.h"
20
21#if defined(CONFIG_PROC_FS)
22
23#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
24
25static void show_fdinfo(struct seq_file *m, struct file *f,
26			void (*show)(struct seq_file *m,
27				     struct fsnotify_mark *mark))
28{
29	struct fsnotify_group *group = f->private_data;
30	struct fsnotify_mark *mark;
31
32	fsnotify_group_lock(group);
33	list_for_each_entry(mark, &group->marks_list, g_list) {
34		show(m, mark);
35		if (seq_has_overflowed(m))
36			break;
37	}
38	fsnotify_group_unlock(group);
39}
40
41#if defined(CONFIG_EXPORTFS)
42static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
43{
44	struct {
45		struct file_handle handle;
46		u8 pad[MAX_HANDLE_SZ];
47	} f;
48	int size, ret, i;
49
50	f.handle.handle_bytes = sizeof(f.pad);
51	size = f.handle.handle_bytes >> 2;
52
53	ret = exportfs_encode_fid(inode, (struct fid *)f.handle.f_handle, &size);
54	if ((ret == FILEID_INVALID) || (ret < 0)) {
55		WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
56		return;
57	}
58
59	f.handle.handle_type = ret;
60	f.handle.handle_bytes = size * sizeof(u32);
61
62	seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
63		   f.handle.handle_bytes, f.handle.handle_type);
64
65	for (i = 0; i < f.handle.handle_bytes; i++)
66		seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
67}
68#else
69static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
70{
71}
72#endif
73
74#ifdef CONFIG_INOTIFY_USER
75
76static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
77{
78	struct inotify_inode_mark *inode_mark;
79	struct inode *inode;
80
81	if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
82		return;
83
84	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
85	inode = igrab(fsnotify_conn_inode(mark->connector));
86	if (inode) {
87		seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ",
88			   inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
89			   inotify_mark_user_mask(mark));
90		show_mark_fhandle(m, inode);
91		seq_putc(m, '\n');
92		iput(inode);
93	}
94}
95
96void inotify_show_fdinfo(struct seq_file *m, struct file *f)
97{
98	show_fdinfo(m, f, inotify_fdinfo);
99}
100
101#endif /* CONFIG_INOTIFY_USER */
102
103#ifdef CONFIG_FANOTIFY
104
105static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
106{
107	unsigned int mflags = fanotify_mark_user_flags(mark);
108	struct inode *inode;
109
110	if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
111		inode = igrab(fsnotify_conn_inode(mark->connector));
112		if (!inode)
113			return;
114		seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
115			   inode->i_ino, inode->i_sb->s_dev,
116			   mflags, mark->mask, mark->ignore_mask);
117		show_mark_fhandle(m, inode);
118		seq_putc(m, '\n');
119		iput(inode);
120	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
121		struct mount *mnt = fsnotify_conn_mount(mark->connector);
122
123		seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
124			   mnt->mnt_id, mflags, mark->mask, mark->ignore_mask);
125	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
126		struct super_block *sb = fsnotify_conn_sb(mark->connector);
127
128		seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
129			   sb->s_dev, mflags, mark->mask, mark->ignore_mask);
130	}
131}
132
133void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
134{
135	struct fsnotify_group *group = f->private_data;
136
137	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
138		   group->fanotify_data.flags & FANOTIFY_INIT_FLAGS,
139		   group->fanotify_data.f_flags);
140
141	show_fdinfo(m, f, fanotify_fdinfo);
142}
143
144#endif /* CONFIG_FANOTIFY */
145
146#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
147
148#endif /* CONFIG_PROC_FS */
149