1
2#ifndef _LINUX_FS_NOTIFY_H
3#define _LINUX_FS_NOTIFY_H
4
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14
15#include <linux/fsnotify_backend.h>
16#include <linux/audit.h>
17#include <linux/slab.h>
18#include <linux/bug.h>
19
20
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27
28
29static inline void fsnotify_name(struct inode *dir, __u32 mask,
30 struct inode *child,
31 const struct qstr *name, u32 cookie)
32{
33 fsnotify(mask, child, FSNOTIFY_EVENT_INODE, dir, name, NULL, cookie);
34}
35
36static inline void fsnotify_dirent(struct inode *dir, struct dentry *dentry,
37 __u32 mask)
38{
39 fsnotify_name(dir, mask, d_inode(dentry), &dentry->d_name, 0);
40}
41
42static inline void fsnotify_inode(struct inode *inode, __u32 mask)
43{
44 if (S_ISDIR(inode->i_mode))
45 mask |= FS_ISDIR;
46
47 fsnotify(mask, inode, FSNOTIFY_EVENT_INODE, NULL, NULL, inode, 0);
48}
49
50
51static inline int fsnotify_parent(struct dentry *dentry, __u32 mask,
52 const void *data, int data_type)
53{
54 struct inode *inode = d_inode(dentry);
55
56 if (S_ISDIR(inode->i_mode)) {
57 mask |= FS_ISDIR;
58
59
60 if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED))
61 goto notify_child;
62 }
63
64
65 if (IS_ROOT(dentry))
66 goto notify_child;
67
68 return __fsnotify_parent(dentry, mask, data, data_type);
69
70notify_child:
71 return fsnotify(mask, data, data_type, NULL, NULL, inode, 0);
72}
73
74
75
76
77
78static inline void fsnotify_dentry(struct dentry *dentry, __u32 mask)
79{
80 fsnotify_parent(dentry, mask, d_inode(dentry), FSNOTIFY_EVENT_INODE);
81}
82
83static inline int fsnotify_file(struct file *file, __u32 mask)
84{
85 const struct path *path = &file->f_path;
86
87 if (file->f_mode & FMODE_NONOTIFY)
88 return 0;
89
90 return fsnotify_parent(path->dentry, mask, path, FSNOTIFY_EVENT_PATH);
91}
92
93
94static inline int fsnotify_perm(struct file *file, int mask)
95{
96 int ret;
97 __u32 fsnotify_mask = 0;
98
99 if (!(mask & (MAY_READ | MAY_OPEN)))
100 return 0;
101
102 if (mask & MAY_OPEN) {
103 fsnotify_mask = FS_OPEN_PERM;
104
105 if (file->f_flags & __FMODE_EXEC) {
106 ret = fsnotify_file(file, FS_OPEN_EXEC_PERM);
107
108 if (ret)
109 return ret;
110 }
111 } else if (mask & MAY_READ) {
112 fsnotify_mask = FS_ACCESS_PERM;
113 }
114
115 return fsnotify_file(file, fsnotify_mask);
116}
117
118
119
120
121static inline void fsnotify_link_count(struct inode *inode)
122{
123 fsnotify_inode(inode, FS_ATTRIB);
124}
125
126
127
128
129static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
130 const struct qstr *old_name,
131 int isdir, struct inode *target,
132 struct dentry *moved)
133{
134 struct inode *source = moved->d_inode;
135 u32 fs_cookie = fsnotify_get_cookie();
136 __u32 old_dir_mask = FS_MOVED_FROM;
137 __u32 new_dir_mask = FS_MOVED_TO;
138 const struct qstr *new_name = &moved->d_name;
139
140 if (old_dir == new_dir)
141 old_dir_mask |= FS_DN_RENAME;
142
143 if (isdir) {
144 old_dir_mask |= FS_ISDIR;
145 new_dir_mask |= FS_ISDIR;
146 }
147
148 fsnotify_name(old_dir, old_dir_mask, source, old_name, fs_cookie);
149 fsnotify_name(new_dir, new_dir_mask, source, new_name, fs_cookie);
150
151 if (target)
152 fsnotify_link_count(target);
153 fsnotify_inode(source, FS_MOVE_SELF);
154 audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
155}
156
157
158
159
160static inline void fsnotify_inode_delete(struct inode *inode)
161{
162 __fsnotify_inode_delete(inode);
163}
164
165
166
167
168static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
169{
170 __fsnotify_vfsmount_delete(mnt);
171}
172
173
174
175
176static inline void fsnotify_inoderemove(struct inode *inode)
177{
178 fsnotify_inode(inode, FS_DELETE_SELF);
179 __fsnotify_inode_delete(inode);
180}
181
182
183
184
185static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
186{
187 audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
188
189 fsnotify_dirent(inode, dentry, FS_CREATE);
190}
191
192
193
194
195
196
197static inline void fsnotify_link(struct inode *dir, struct inode *inode,
198 struct dentry *new_dentry)
199{
200 fsnotify_link_count(inode);
201 audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
202
203 fsnotify_name(dir, FS_CREATE, inode, &new_dentry->d_name, 0);
204}
205
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209
210
211static inline void fsnotify_unlink(struct inode *dir, struct dentry *dentry)
212{
213
214 WARN_ON_ONCE(d_is_negative(dentry));
215
216 fsnotify_dirent(dir, dentry, FS_DELETE);
217}
218
219
220
221
222static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
223{
224 audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
225
226 fsnotify_dirent(inode, dentry, FS_CREATE | FS_ISDIR);
227}
228
229
230
231
232
233
234static inline void fsnotify_rmdir(struct inode *dir, struct dentry *dentry)
235{
236
237 WARN_ON_ONCE(d_is_negative(dentry));
238
239 fsnotify_dirent(dir, dentry, FS_DELETE | FS_ISDIR);
240}
241
242
243
244
245static inline void fsnotify_access(struct file *file)
246{
247 fsnotify_file(file, FS_ACCESS);
248}
249
250
251
252
253static inline void fsnotify_modify(struct file *file)
254{
255 fsnotify_file(file, FS_MODIFY);
256}
257
258
259
260
261static inline void fsnotify_open(struct file *file)
262{
263 __u32 mask = FS_OPEN;
264
265 if (file->f_flags & __FMODE_EXEC)
266 mask |= FS_OPEN_EXEC;
267
268 fsnotify_file(file, mask);
269}
270
271
272
273
274static inline void fsnotify_close(struct file *file)
275{
276 __u32 mask = (file->f_mode & FMODE_WRITE) ? FS_CLOSE_WRITE :
277 FS_CLOSE_NOWRITE;
278
279 fsnotify_file(file, mask);
280}
281
282
283
284
285static inline void fsnotify_xattr(struct dentry *dentry)
286{
287 fsnotify_dentry(dentry, FS_ATTRIB);
288}
289
290
291
292
293
294static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
295{
296 __u32 mask = 0;
297
298 if (ia_valid & ATTR_UID)
299 mask |= FS_ATTRIB;
300 if (ia_valid & ATTR_GID)
301 mask |= FS_ATTRIB;
302 if (ia_valid & ATTR_SIZE)
303 mask |= FS_MODIFY;
304
305
306 if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
307 mask |= FS_ATTRIB;
308 else if (ia_valid & ATTR_ATIME)
309 mask |= FS_ACCESS;
310 else if (ia_valid & ATTR_MTIME)
311 mask |= FS_MODIFY;
312
313 if (ia_valid & ATTR_MODE)
314 mask |= FS_ATTRIB;
315
316 if (mask)
317 fsnotify_dentry(dentry, mask);
318}
319
320#endif
321