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 "fdinfo.h"
18 #include "fsnotify.h"
19
20 #if defined(CONFIG_PROC_FS)
21
22 #if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
23
show_fdinfo(struct seq_file * m,struct file * f,void (* show)(struct seq_file * m,struct fsnotify_mark * mark))24 static void show_fdinfo(struct seq_file *m, struct file *f,
25 void (*show)(struct seq_file *m,
26 struct fsnotify_mark *mark))
27 {
28 struct fsnotify_group *group = f->private_data;
29 struct fsnotify_mark *mark;
30
31 mutex_lock(&group->mark_mutex);
32 list_for_each_entry(mark, &group->marks_list, g_list) {
33 show(m, mark);
34 if (seq_has_overflowed(m))
35 break;
36 }
37 mutex_unlock(&group->mark_mutex);
38 }
39
40 #if defined(CONFIG_EXPORTFS)
show_mark_fhandle(struct seq_file * m,struct inode * inode)41 static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
42 {
43 struct {
44 struct file_handle handle;
45 u8 pad[MAX_HANDLE_SZ];
46 } f;
47 int size, ret, i;
48
49 f.handle.handle_bytes = sizeof(f.pad);
50 size = f.handle.handle_bytes >> 2;
51
52 ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, NULL);
53 if ((ret == FILEID_INVALID) || (ret < 0)) {
54 WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
55 return;
56 }
57
58 f.handle.handle_type = ret;
59 f.handle.handle_bytes = size * sizeof(u32);
60
61 seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
62 f.handle.handle_bytes, f.handle.handle_type);
63
64 for (i = 0; i < f.handle.handle_bytes; i++)
65 seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
66 }
67 #else
show_mark_fhandle(struct seq_file * m,struct inode * inode)68 static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
69 {
70 }
71 #endif
72
73 #ifdef CONFIG_INOTIFY_USER
74
inotify_fdinfo(struct seq_file * m,struct fsnotify_mark * mark)75 static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
76 {
77 struct inotify_inode_mark *inode_mark;
78 struct inode *inode;
79
80 if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
81 return;
82
83 inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
84 inode = igrab(fsnotify_conn_inode(mark->connector));
85 if (inode) {
86 /*
87 * IN_ALL_EVENTS represents all of the mask bits
88 * that we expose to userspace. There is at
89 * least one bit (FS_EVENT_ON_CHILD) which is
90 * used only internally to the kernel.
91 */
92 u32 mask = mark->mask & IN_ALL_EVENTS;
93 seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
94 inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
95 mask, mark->ignored_mask);
96 show_mark_fhandle(m, inode);
97 seq_putc(m, '\n');
98 iput(inode);
99 }
100 }
101
inotify_show_fdinfo(struct seq_file * m,struct file * f)102 void inotify_show_fdinfo(struct seq_file *m, struct file *f)
103 {
104 show_fdinfo(m, f, inotify_fdinfo);
105 }
106
107 #endif /* CONFIG_INOTIFY_USER */
108
109 #ifdef CONFIG_FANOTIFY
110
fanotify_fdinfo(struct seq_file * m,struct fsnotify_mark * mark)111 static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
112 {
113 unsigned int mflags = 0;
114 struct inode *inode;
115
116 if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
117 mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
118
119 if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
120 inode = igrab(fsnotify_conn_inode(mark->connector));
121 if (!inode)
122 return;
123 seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
124 inode->i_ino, inode->i_sb->s_dev,
125 mflags, mark->mask, mark->ignored_mask);
126 show_mark_fhandle(m, inode);
127 seq_putc(m, '\n');
128 iput(inode);
129 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
130 struct mount *mnt = fsnotify_conn_mount(mark->connector);
131
132 seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
133 mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
134 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
135 struct super_block *sb = fsnotify_conn_sb(mark->connector);
136
137 seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
138 sb->s_dev, mflags, mark->mask, mark->ignored_mask);
139 }
140 }
141
fanotify_show_fdinfo(struct seq_file * m,struct file * f)142 void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
143 {
144 struct fsnotify_group *group = f->private_data;
145
146 seq_printf(m, "fanotify flags:%x event-flags:%x\n",
147 group->fanotify_data.flags,
148 group->fanotify_data.f_flags);
149
150 show_fdinfo(m, f, fanotify_fdinfo);
151 }
152
153 #endif /* CONFIG_FANOTIFY */
154
155 #endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
156
157 #endif /* CONFIG_PROC_FS */
158