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 return;
52
53 f->handle_type = ret;
54 f->handle_bytes = size * sizeof(u32);
55
56 seq_printf(m, "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, "%02x", (int)f->f_handle[i]);
61 }
62 #else
show_mark_fhandle(struct seq_file * m,struct inode * inode)63 static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
64 {
65 }
66 #endif
67
68 #ifdef CONFIG_INOTIFY_USER
69
inotify_fdinfo(struct seq_file * m,struct fsnotify_mark * mark)70 static 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(mark->connector));
80 if (inode) {
81 seq_printf(m, "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(mark));
84 show_mark_fhandle(m, inode);
85 seq_putc(m, '\n');
86 iput(inode);
87 }
88 }
89
inotify_show_fdinfo(struct seq_file * m,struct file * f)90 void inotify_show_fdinfo(struct seq_file *m, struct file *f)
91 {
92 show_fdinfo(m, f, inotify_fdinfo);
93 }
94
95 #endif /* CONFIG_INOTIFY_USER */
96
97 #ifdef CONFIG_FANOTIFY
98
fanotify_fdinfo(struct seq_file * m,struct fsnotify_mark * mark)99 static 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 }
125 }
126
fanotify_show_fdinfo(struct seq_file * m,struct file * f)127 void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
128 {
129 struct fsnotify_group *group = f->private_data;
130
131 seq_printf(m, "fanotify flags:%x event-flags:%x\n",
132 group->fanotify_data.flags & FANOTIFY_INIT_FLAGS,
133 group->fanotify_data.f_flags);
134
135 show_fdinfo(m, f, fanotify_fdinfo);
136 }
137
138 #endif /* CONFIG_FANOTIFY */
139
140 #endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
141
142 #endif /* CONFIG_PROC_FS */
143