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TOMOYO Linux Cross Reference
Linux/include/linux/fsnotify.h

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  1 #ifndef _LINUX_FS_NOTIFY_H
  2 #define _LINUX_FS_NOTIFY_H
  3 
  4 /*
  5  * include/linux/fsnotify.h - generic hooks for filesystem notification, to
  6  * reduce in-source duplication from both dnotify and inotify.
  7  *
  8  * We don't compile any of this away in some complicated menagerie of ifdefs.
  9  * Instead, we rely on the code inside to optimize away as needed.
 10  *
 11  * (C) Copyright 2005 Robert Love
 12  */
 13 
 14 #include <linux/fsnotify_backend.h>
 15 #include <linux/audit.h>
 16 #include <linux/slab.h>
 17 #include <linux/bug.h>
 18 
 19 /*
 20  * fsnotify_d_instantiate - instantiate a dentry for inode
 21  */
 22 static inline void fsnotify_d_instantiate(struct dentry *dentry,
 23                                           struct inode *inode)
 24 {
 25         __fsnotify_d_instantiate(dentry, inode);
 26 }
 27 
 28 /* Notify this dentry's parent about a child's events. */
 29 static inline int fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
 30 {
 31         if (!dentry)
 32                 dentry = path->dentry;
 33 
 34         return __fsnotify_parent(path, dentry, mask);
 35 }
 36 
 37 /* simple call site for access decisions */
 38 static inline int fsnotify_perm(struct file *file, int mask)
 39 {
 40         struct path *path = &file->f_path;
 41         struct inode *inode = file_inode(file);
 42         __u32 fsnotify_mask = 0;
 43         int ret;
 44 
 45         if (file->f_mode & FMODE_NONOTIFY)
 46                 return 0;
 47         if (!(mask & (MAY_READ | MAY_OPEN)))
 48                 return 0;
 49         if (mask & MAY_OPEN)
 50                 fsnotify_mask = FS_OPEN_PERM;
 51         else if (mask & MAY_READ)
 52                 fsnotify_mask = FS_ACCESS_PERM;
 53         else
 54                 BUG();
 55 
 56         ret = fsnotify_parent(path, NULL, fsnotify_mask);
 57         if (ret)
 58                 return ret;
 59 
 60         return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
 61 }
 62 
 63 /*
 64  * fsnotify_d_move - dentry has been moved
 65  */
 66 static inline void fsnotify_d_move(struct dentry *dentry)
 67 {
 68         /*
 69          * On move we need to update dentry->d_flags to indicate if the new parent
 70          * cares about events from this dentry.
 71          */
 72         __fsnotify_update_dcache_flags(dentry);
 73 }
 74 
 75 /*
 76  * fsnotify_link_count - inode's link count changed
 77  */
 78 static inline void fsnotify_link_count(struct inode *inode)
 79 {
 80         fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
 81 }
 82 
 83 /*
 84  * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
 85  */
 86 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
 87                                  const unsigned char *old_name,
 88                                  int isdir, struct inode *target, struct dentry *moved)
 89 {
 90         struct inode *source = moved->d_inode;
 91         u32 fs_cookie = fsnotify_get_cookie();
 92         __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM);
 93         __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO);
 94         const unsigned char *new_name = moved->d_name.name;
 95 
 96         if (old_dir == new_dir)
 97                 old_dir_mask |= FS_DN_RENAME;
 98 
 99         if (isdir) {
100                 old_dir_mask |= FS_ISDIR;
101                 new_dir_mask |= FS_ISDIR;
102         }
103 
104         fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name,
105                  fs_cookie);
106         fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name,
107                  fs_cookie);
108 
109         if (target)
110                 fsnotify_link_count(target);
111 
112         if (source)
113                 fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
114         audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
115 }
116 
117 /*
118  * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
119  */
120 static inline void fsnotify_inode_delete(struct inode *inode)
121 {
122         __fsnotify_inode_delete(inode);
123 }
124 
125 /*
126  * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
127  */
128 static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
129 {
130         __fsnotify_vfsmount_delete(mnt);
131 }
132 
133 /*
134  * fsnotify_nameremove - a filename was removed from a directory
135  */
136 static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
137 {
138         __u32 mask = FS_DELETE;
139 
140         if (isdir)
141                 mask |= FS_ISDIR;
142 
143         fsnotify_parent(NULL, dentry, mask);
144 }
145 
146 /*
147  * fsnotify_inoderemove - an inode is going away
148  */
149 static inline void fsnotify_inoderemove(struct inode *inode)
150 {
151         fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
152         __fsnotify_inode_delete(inode);
153 }
154 
155 /*
156  * fsnotify_create - 'name' was linked in
157  */
158 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
159 {
160         audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
161 
162         fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
163 }
164 
165 /*
166  * fsnotify_link - new hardlink in 'inode' directory
167  * Note: We have to pass also the linked inode ptr as some filesystems leave
168  *   new_dentry->d_inode NULL and instantiate inode pointer later
169  */
170 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
171 {
172         fsnotify_link_count(inode);
173         audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
174 
175         fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
176 }
177 
178 /*
179  * fsnotify_mkdir - directory 'name' was created
180  */
181 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
182 {
183         __u32 mask = (FS_CREATE | FS_ISDIR);
184         struct inode *d_inode = dentry->d_inode;
185 
186         audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
187 
188         fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
189 }
190 
191 /*
192  * fsnotify_access - file was read
193  */
194 static inline void fsnotify_access(struct file *file)
195 {
196         struct path *path = &file->f_path;
197         struct inode *inode = file_inode(file);
198         __u32 mask = FS_ACCESS;
199 
200         if (S_ISDIR(inode->i_mode))
201                 mask |= FS_ISDIR;
202 
203         if (!(file->f_mode & FMODE_NONOTIFY)) {
204                 fsnotify_parent(path, NULL, mask);
205                 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
206         }
207 }
208 
209 /*
210  * fsnotify_modify - file was modified
211  */
212 static inline void fsnotify_modify(struct file *file)
213 {
214         struct path *path = &file->f_path;
215         struct inode *inode = file_inode(file);
216         __u32 mask = FS_MODIFY;
217 
218         if (S_ISDIR(inode->i_mode))
219                 mask |= FS_ISDIR;
220 
221         if (!(file->f_mode & FMODE_NONOTIFY)) {
222                 fsnotify_parent(path, NULL, mask);
223                 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
224         }
225 }
226 
227 /*
228  * fsnotify_open - file was opened
229  */
230 static inline void fsnotify_open(struct file *file)
231 {
232         struct path *path = &file->f_path;
233         struct inode *inode = file_inode(file);
234         __u32 mask = FS_OPEN;
235 
236         if (S_ISDIR(inode->i_mode))
237                 mask |= FS_ISDIR;
238 
239         fsnotify_parent(path, NULL, mask);
240         fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
241 }
242 
243 /*
244  * fsnotify_close - file was closed
245  */
246 static inline void fsnotify_close(struct file *file)
247 {
248         struct path *path = &file->f_path;
249         struct inode *inode = file_inode(file);
250         fmode_t mode = file->f_mode;
251         __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
252 
253         if (S_ISDIR(inode->i_mode))
254                 mask |= FS_ISDIR;
255 
256         if (!(file->f_mode & FMODE_NONOTIFY)) {
257                 fsnotify_parent(path, NULL, mask);
258                 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
259         }
260 }
261 
262 /*
263  * fsnotify_xattr - extended attributes were changed
264  */
265 static inline void fsnotify_xattr(struct dentry *dentry)
266 {
267         struct inode *inode = dentry->d_inode;
268         __u32 mask = FS_ATTRIB;
269 
270         if (S_ISDIR(inode->i_mode))
271                 mask |= FS_ISDIR;
272 
273         fsnotify_parent(NULL, dentry, mask);
274         fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
275 }
276 
277 /*
278  * fsnotify_change - notify_change event.  file was modified and/or metadata
279  * was changed.
280  */
281 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
282 {
283         struct inode *inode = dentry->d_inode;
284         __u32 mask = 0;
285 
286         if (ia_valid & ATTR_UID)
287                 mask |= FS_ATTRIB;
288         if (ia_valid & ATTR_GID)
289                 mask |= FS_ATTRIB;
290         if (ia_valid & ATTR_SIZE)
291                 mask |= FS_MODIFY;
292 
293         /* both times implies a utime(s) call */
294         if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
295                 mask |= FS_ATTRIB;
296         else if (ia_valid & ATTR_ATIME)
297                 mask |= FS_ACCESS;
298         else if (ia_valid & ATTR_MTIME)
299                 mask |= FS_MODIFY;
300 
301         if (ia_valid & ATTR_MODE)
302                 mask |= FS_ATTRIB;
303 
304         if (mask) {
305                 if (S_ISDIR(inode->i_mode))
306                         mask |= FS_ISDIR;
307 
308                 fsnotify_parent(NULL, dentry, mask);
309                 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
310         }
311 }
312 
313 #if defined(CONFIG_FSNOTIFY)    /* notify helpers */
314 
315 /*
316  * fsnotify_oldname_init - save off the old filename before we change it
317  */
318 static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name)
319 {
320         return kstrdup(name, GFP_KERNEL);
321 }
322 
323 /*
324  * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
325  */
326 static inline void fsnotify_oldname_free(const unsigned char *old_name)
327 {
328         kfree(old_name);
329 }
330 
331 #else   /* CONFIG_FSNOTIFY */
332 
333 static inline const char *fsnotify_oldname_init(const unsigned char *name)
334 {
335         return NULL;
336 }
337 
338 static inline void fsnotify_oldname_free(const unsigned char *old_name)
339 {
340 }
341 
342 #endif  /*  CONFIG_FSNOTIFY */
343 
344 #endif  /* _LINUX_FS_NOTIFY_H */
345 

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