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
23static void show_fdinfo(struct seq_file *m, struct file *f,
24			void (*show)(struct seq_file *m,
25				     struct fsnotify_mark *mark))
26{
27	struct fsnotify_group *group = f->private_data;
28	struct fsnotify_mark *mark;
29
30	mutex_lock(&group->mark_mutex);
31	list_for_each_entry(mark, &group->marks_list, g_list) {
32		show(m, mark);
33		if (seq_has_overflowed(m))
34			break;
35	}
36	mutex_unlock(&group->mark_mutex);
37}
38
39#if defined(CONFIG_EXPORTFS)
40static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
41{
42	struct {
43		struct file_handle handle;
44		u8 pad[MAX_HANDLE_SZ];
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);
52	if ((ret == FILEID_INVALID) || (ret < 0)) {
53		WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
54		return;
55	}
56
57	f.handle.handle_type = ret;
58	f.handle.handle_bytes = size * sizeof(u32);
59
60	seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
61		   f.handle.handle_bytes, f.handle.handle_type);
62
63	for (i = 0; i < f.handle.handle_bytes; i++)
64		seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
65}
66#else
67static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
68{
69}
70#endif
71
72#ifdef CONFIG_INOTIFY_USER
73
74static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
75{
76	struct inotify_inode_mark *inode_mark;
77	struct inode *inode;
78
79	if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE)))
80		return;
81
82	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
83	inode = igrab(mark->inode);
84	if (inode) {
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');
90		iput(inode);
91	}
92}
93
94void inotify_show_fdinfo(struct seq_file *m, struct file *f)
95{
96	show_fdinfo(m, f, inotify_fdinfo);
97}
98
99#endif /* CONFIG_INOTIFY_USER */
100
101#ifdef CONFIG_FANOTIFY
102
103static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
104{
105	unsigned int mflags = 0;
106	struct inode *inode;
107
108	if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
109		return;
110
111	if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
112		mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
113
114	if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
115		inode = igrab(mark->inode);
116		if (!inode)
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');
123		iput(inode);
124	} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
125		struct mount *mnt = real_mount(mark->mnt);
126
127		seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
128			   mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
129	}
130}
131
132void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
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
158	show_fdinfo(m, f, fanotify_fdinfo);
159}
160
161#endif /* CONFIG_FANOTIFY */
162
163#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
164
165#endif /* CONFIG_PROC_FS */
166