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