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/proc_fs.h>
15 #include <linux/exportfs.h>
16
17 #include "inotify/inotify.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 mutex_lock(&group->mark_mutex);
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 mutex_unlock(&group->mark_mutex);
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 struct {
45 struct file_handle handle;
46 u8 pad[MAX_HANDLE_SZ];
47 } f;
48 int size, ret, i;
49
50 f.handle.handle_bytes = sizeof(f.pad);
51 size = f.handle.handle_bytes >> 2;
52
53 ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
54 if ((ret == FILEID_INVALID) || (ret < 0)) {
55 WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
56 return;
57 }
58
59 f.handle.handle_type = ret;
60 f.handle.handle_bytes = size * sizeof(u32);
61
62 seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
63 f.handle.handle_bytes, f.handle.handle_type);
64
65 for (i = 0; i < f.handle.handle_bytes; i++)
66 seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
67 }
68 #else
show_mark_fhandle(struct seq_file * m,struct inode * inode)69 static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
70 {
71 }
72 #endif
73
74 #ifdef CONFIG_INOTIFY_USER
75
inotify_fdinfo(struct seq_file * m,struct fsnotify_mark * mark)76 static 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(mark->connector));
86 if (inode) {
87 /*
88 * IN_ALL_EVENTS represents all of the mask bits
89 * that we expose to userspace. There is at
90 * least one bit (FS_EVENT_ON_CHILD) which is
91 * used only internally to the kernel.
92 */
93 u32 mask = mark->mask & IN_ALL_EVENTS;
94 seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
95 inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
96 mask, mark->ignored_mask);
97 show_mark_fhandle(m, inode);
98 seq_putc(m, '\n');
99 iput(inode);
100 }
101 }
102
inotify_show_fdinfo(struct seq_file * m,struct file * f)103 void inotify_show_fdinfo(struct seq_file *m, struct file *f)
104 {
105 show_fdinfo(m, f, inotify_fdinfo);
106 }
107
108 #endif /* CONFIG_INOTIFY_USER */
109
110 #ifdef CONFIG_FANOTIFY
111
fanotify_fdinfo(struct seq_file * m,struct fsnotify_mark * mark)112 static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
113 {
114 unsigned int mflags = 0;
115 struct inode *inode;
116
117 if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
118 mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
119
120 if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
121 inode = igrab(fsnotify_conn_inode(mark->connector));
122 if (!inode)
123 return;
124 seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
125 inode->i_ino, inode->i_sb->s_dev,
126 mflags, mark->mask, mark->ignored_mask);
127 show_mark_fhandle(m, inode);
128 seq_putc(m, '\n');
129 iput(inode);
130 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
131 struct mount *mnt = fsnotify_conn_mount(mark->connector);
132
133 seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
134 mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
135 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
136 struct super_block *sb = fsnotify_conn_sb(mark->connector);
137
138 seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
139 sb->s_dev, mflags, mark->mask, mark->ignored_mask);
140 }
141 }
142
fanotify_show_fdinfo(struct seq_file * m,struct file * f)143 void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
144 {
145 struct fsnotify_group *group = f->private_data;
146
147 seq_printf(m, "fanotify flags:%x event-flags:%x\n",
148 group->fanotify_data.flags, 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