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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#include "../internal.h"
21
22#if defined(CONFIG_PROC_FS)
23
24#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
25
26static void show_fdinfo(struct seq_file *m, struct file *f,
27 void (*show)(struct seq_file *m,
28 struct fsnotify_mark *mark))
29{
30 struct fsnotify_group *group = f->private_data;
31 struct fsnotify_mark *mark;
32
33 fsnotify_group_lock(group);
34 list_for_each_entry(mark, &group->marks_list, g_list) {
35 show(m, mark);
36 if (seq_has_overflowed(m))
37 break;
38 }
39 fsnotify_group_unlock(group);
40}
41
42#if defined(CONFIG_EXPORTFS)
43static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
44{
45 DEFINE_FLEX(struct file_handle, f, f_handle, handle_bytes, MAX_HANDLE_SZ);
46 int size, ret, i;
47
48 size = f->handle_bytes >> 2;
49
50 if (!super_trylock_shared(sb: inode->i_sb))
51 return;
52
53 ret = exportfs_encode_fid(inode, fid: (struct fid *)f->f_handle, max_len: &size);
54 up_read(sem: &inode->i_sb->s_umount);
55
56 if ((ret == FILEID_INVALID) || (ret < 0))
57 return;
58
59 f->handle_type = ret;
60 f->handle_bytes = size * sizeof(u32);
61
62 seq_printf(m, fmt: "fhandle-bytes:%x fhandle-type:%x f_handle:",
63 f->handle_bytes, f->handle_type);
64
65 for (i = 0; i < f->handle_bytes; i++)
66 seq_printf(m, fmt: "%02x", (int)f->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(conn: mark->connector));
86 if (inode) {
87 seq_printf(m, fmt: "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(fsn_mark: mark));
90 show_mark_fhandle(m, inode);
91 seq_putc(m, c: '\n');
92 iput(inode);
93 }
94}
95
96void inotify_show_fdinfo(struct seq_file *m, struct file *f)
97{
98 show_fdinfo(m, f, show: 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(conn: mark->connector));
112 if (!inode)
113 return;
114 seq_printf(m, fmt: "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, c: '\n');
119 iput(inode);
120 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
121 struct mount *mnt = fsnotify_conn_mount(conn: mark->connector);
122
123 seq_printf(m, fmt: "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(conn: mark->connector);
127
128 seq_printf(m, fmt: "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
129 sb->s_dev, mflags, mark->mask, mark->ignore_mask);
130 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_MNTNS) {
131 struct mnt_namespace *mnt_ns = fsnotify_conn_mntns(conn: mark->connector);
132
133 seq_printf(m, fmt: "fanotify mnt_ns:%u mflags:%x mask:%x ignored_mask:%x\n",
134 mnt_ns->ns.inum, mflags, mark->mask, mark->ignore_mask);
135 }
136}
137
138void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
139{
140 struct fsnotify_group *group = f->private_data;
141
142 seq_printf(m, fmt: "fanotify flags:%x event-flags:%x\n",
143 group->fanotify_data.flags & FANOTIFY_INIT_FLAGS,
144 group->fanotify_data.f_flags);
145
146 show_fdinfo(m, f, show: fanotify_fdinfo);
147}
148
149#endif /* CONFIG_FANOTIFY */
150
151#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
152
153#endif /* CONFIG_PROC_FS */
154

source code of linux/fs/notify/fdinfo.c