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 DEFINE_FLEX(struct file_handle, f, f_handle, handle_bytes, MAX_HANDLE_SZ);
45 int size, ret, i;
46
47 size = f->handle_bytes >> 2;
48
49 ret = exportfs_encode_fid(inode, fid: (struct fid *)f->f_handle, max_len: &size);
50 if ((ret == FILEID_INVALID) || (ret < 0))
51 return;
52
53 f->handle_type = ret;
54 f->handle_bytes = size * sizeof(u32);
55
56 seq_printf(m, fmt: "fhandle-bytes:%x fhandle-type:%x f_handle:",
57 f->handle_bytes, f->handle_type);
58
59 for (i = 0; i < f->handle_bytes; i++)
60 seq_printf(m, fmt: "%02x", (int)f->f_handle[i]);
61}
62#else
63static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
64{
65}
66#endif
67
68#ifdef CONFIG_INOTIFY_USER
69
70static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
71{
72 struct inotify_inode_mark *inode_mark;
73 struct inode *inode;
74
75 if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
76 return;
77
78 inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
79 inode = igrab(fsnotify_conn_inode(conn: mark->connector));
80 if (inode) {
81 seq_printf(m, fmt: "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ",
82 inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
83 inotify_mark_user_mask(fsn_mark: mark));
84 show_mark_fhandle(m, inode);
85 seq_putc(m, c: '\n');
86 iput(inode);
87 }
88}
89
90void inotify_show_fdinfo(struct seq_file *m, struct file *f)
91{
92 show_fdinfo(m, f, show: inotify_fdinfo);
93}
94
95#endif /* CONFIG_INOTIFY_USER */
96
97#ifdef CONFIG_FANOTIFY
98
99static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
100{
101 unsigned int mflags = fanotify_mark_user_flags(mark);
102 struct inode *inode;
103
104 if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
105 inode = igrab(fsnotify_conn_inode(mark->connector));
106 if (!inode)
107 return;
108 seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
109 inode->i_ino, inode->i_sb->s_dev,
110 mflags, mark->mask, mark->ignore_mask);
111 show_mark_fhandle(m, inode);
112 seq_putc(m, '\n');
113 iput(inode);
114 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
115 struct mount *mnt = fsnotify_conn_mount(mark->connector);
116
117 seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
118 mnt->mnt_id, mflags, mark->mask, mark->ignore_mask);
119 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
120 struct super_block *sb = fsnotify_conn_sb(mark->connector);
121
122 seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
123 sb->s_dev, mflags, mark->mask, mark->ignore_mask);
124 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_MNTNS) {
125 struct mnt_namespace *mnt_ns = fsnotify_conn_mntns(mark->connector);
126
127 seq_printf(m, "fanotify mnt_ns:%u mflags:%x mask:%x ignored_mask:%x\n",
128 mnt_ns->ns.inum, mflags, mark->mask, mark->ignore_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
136 seq_printf(m, "fanotify flags:%x event-flags:%x\n",
137 group->fanotify_data.flags & FANOTIFY_INIT_FLAGS,
138 group->fanotify_data.f_flags);
139
140 show_fdinfo(m, f, fanotify_fdinfo);
141}
142
143#endif /* CONFIG_FANOTIFY */
144
145#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
146
147#endif /* CONFIG_PROC_FS */
148