tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/file.h>
2#include <linux/fs.h>
3#include <linux/fsnotify_backend.h>
4#include <linux/idr.h>
5#include <linux/init.h>
6#include <linux/inotify.h>
7#include <linux/fanotify.h>
8#include <linux/kernel.h>
9#include <linux/namei.h>
10#include <linux/sched.h>
11#include <linux/types.h>
12#include <linux/seq_file.h>
13#include <linux/proc_fs.h>
14#include <linux/exportfs.h>
15
16#include "inotify/inotify.h"
17#include "../fs/mount.h"
18
19#if defined(CONFIG_PROC_FS)
20
21#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
22
23static int show_fdinfo(struct seq_file *m, struct file *f,
24 int (*show)(struct seq_file *m, struct fsnotify_mark *mark))
25{
26 struct fsnotify_group *group = f->private_data;
27 struct fsnotify_mark *mark;
28 int ret = 0;
29
30 mutex_lock(&group->mark_mutex);
31 list_for_each_entry(mark, &group->marks_list, g_list) {
32 ret = show(m, mark);
33 if (ret)
34 break;
35 }
36 mutex_unlock(&group->mark_mutex);
37 return ret;
38}
39
40#if defined(CONFIG_EXPORTFS)
41static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
42{
43 struct {
44 struct file_handle handle;
45 u8 pad[64];
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, 0);
53 if ((ret == 255) || (ret == -ENOSPC)) {
54 WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
55 return 0;
56 }
57
58 f.handle.handle_type = ret;
59 f.handle.handle_bytes = size * sizeof(u32);
60
61 ret = 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 ret |= seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
66
67 return ret;
68}
69#else
70static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
71{
72 return 0;
73}
74#endif
75
76#ifdef CONFIG_INOTIFY_USER
77
78static int inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
79{
80 struct inotify_inode_mark *inode_mark;
81 struct inode *inode;
82 int ret = 0;
83
84 if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE)))
85 return 0;
86
87 inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
88 inode = igrab(mark->i.inode);
89 if (inode) {
90 ret = seq_printf(m, "inotify wd:%x ino:%lx sdev:%x "
91 "mask:%x ignored_mask:%x ",
92 inode_mark->wd, inode->i_ino,
93 inode->i_sb->s_dev,
94 mark->mask, mark->ignored_mask);
95 ret |= show_mark_fhandle(m, inode);
96 ret |= seq_putc(m, '\n');
97 iput(inode);
98 }
99
100 return ret;
101}
102
103int inotify_show_fdinfo(struct seq_file *m, struct file *f)
104{
105 return show_fdinfo(m, f, inotify_fdinfo);
106}
107
108#endif /* CONFIG_INOTIFY_USER */
109
110#ifdef CONFIG_FANOTIFY
111
112static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
113{
114 unsigned int mflags = 0;
115 struct inode *inode;
116 int ret = 0;
117
118 if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
119 return 0;
120
121 if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
122 mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
123
124 if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
125 inode = igrab(mark->i.inode);
126 if (!inode)
127 goto out;
128 ret = seq_printf(m, "fanotify ino:%lx sdev:%x "
129 "mflags:%x mask:%x ignored_mask:%x ",
130 inode->i_ino, inode->i_sb->s_dev,
131 mflags, mark->mask, mark->ignored_mask);
132 ret |= show_mark_fhandle(m, inode);
133 ret |= seq_putc(m, '\n');
134 iput(inode);
135 } else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
136 struct mount *mnt = real_mount(mark->m.mnt);
137
138 ret = seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x "
139 "ignored_mask:%x\n", mnt->mnt_id, mflags,
140 mark->mask, mark->ignored_mask);
141 }
142out:
143 return ret;
144}
145
146int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
147{
148 struct fsnotify_group *group = f->private_data;
149 unsigned int flags = 0;
150
151 switch (group->priority) {
152 case FS_PRIO_0:
153 flags |= FAN_CLASS_NOTIF;
154 break;
155 case FS_PRIO_1:
156 flags |= FAN_CLASS_CONTENT;
157 break;
158 case FS_PRIO_2:
159 flags |= FAN_CLASS_PRE_CONTENT;
160 break;
161 }
162
163 if (group->max_events == UINT_MAX)
164 flags |= FAN_UNLIMITED_QUEUE;
165
166 if (group->fanotify_data.max_marks == UINT_MAX)
167 flags |= FAN_UNLIMITED_MARKS;
168
169 seq_printf(m, "fanotify flags:%x event-flags:%x\n",
170 flags, group->fanotify_data.f_flags);
171
172 return show_fdinfo(m, f, fanotify_fdinfo);
173}
174
175#endif /* CONFIG_FANOTIFY */
176
177#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
178
179#endif /* CONFIG_PROC_FS */