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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 = path->dentry->d_inode;
 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, old_dir, FSNOTIFY_EVENT_INODE, old_name, fs_cookie);
105         fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE, new_name, fs_cookie);
106 
107         if (target)
108                 fsnotify_link_count(target);
109 
110         if (source)
111                 fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
112         audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
113 }
114 
115 /*
116  * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
117  */
118 static inline void fsnotify_inode_delete(struct inode *inode)
119 {
120         __fsnotify_inode_delete(inode);
121 }
122 
123 /*
124  * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
125  */
126 static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
127 {
128         __fsnotify_vfsmount_delete(mnt);
129 }
130 
131 /*
132  * fsnotify_nameremove - a filename was removed from a directory
133  */
134 static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
135 {
136         __u32 mask = FS_DELETE;
137 
138         if (isdir)
139                 mask |= FS_ISDIR;
140 
141         fsnotify_parent(NULL, dentry, mask);
142 }
143 
144 /*
145  * fsnotify_inoderemove - an inode is going away
146  */
147 static inline void fsnotify_inoderemove(struct inode *inode)
148 {
149         fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
150         __fsnotify_inode_delete(inode);
151 }
152 
153 /*
154  * fsnotify_create - 'name' was linked in
155  */
156 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
157 {
158         audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
159 
160         fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
161 }
162 
163 /*
164  * fsnotify_link - new hardlink in 'inode' directory
165  * Note: We have to pass also the linked inode ptr as some filesystems leave
166  *   new_dentry->d_inode NULL and instantiate inode pointer later
167  */
168 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
169 {
170         fsnotify_link_count(inode);
171         audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
172 
173         fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
174 }
175 
176 /*
177  * fsnotify_mkdir - directory 'name' was created
178  */
179 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
180 {
181         __u32 mask = (FS_CREATE | FS_ISDIR);
182         struct inode *d_inode = dentry->d_inode;
183 
184         audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
185 
186         fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
187 }
188 
189 /*
190  * fsnotify_access - file was read
191  */
192 static inline void fsnotify_access(struct file *file)
193 {
194         struct path *path = &file->f_path;
195         struct inode *inode = path->dentry->d_inode;
196         __u32 mask = FS_ACCESS;
197 
198         if (S_ISDIR(inode->i_mode))
199                 mask |= FS_ISDIR;
200 
201         if (!(file->f_mode & FMODE_NONOTIFY)) {
202                 fsnotify_parent(path, NULL, mask);
203                 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
204         }
205 }
206 
207 /*
208  * fsnotify_modify - file was modified
209  */
210 static inline void fsnotify_modify(struct file *file)
211 {
212         struct path *path = &file->f_path;
213         struct inode *inode = path->dentry->d_inode;
214         __u32 mask = FS_MODIFY;
215 
216         if (S_ISDIR(inode->i_mode))
217                 mask |= FS_ISDIR;
218 
219         if (!(file->f_mode & FMODE_NONOTIFY)) {
220                 fsnotify_parent(path, NULL, mask);
221                 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
222         }
223 }
224 
225 /*
226  * fsnotify_open - file was opened
227  */
228 static inline void fsnotify_open(struct file *file)
229 {
230         struct path *path = &file->f_path;
231         struct inode *inode = path->dentry->d_inode;
232         __u32 mask = FS_OPEN;
233 
234         if (S_ISDIR(inode->i_mode))
235                 mask |= FS_ISDIR;
236 
237         fsnotify_parent(path, NULL, mask);
238         fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
239 }
240 
241 /*
242  * fsnotify_close - file was closed
243  */
244 static inline void fsnotify_close(struct file *file)
245 {
246         struct path *path = &file->f_path;
247         struct inode *inode = file_inode(file);
248         fmode_t mode = file->f_mode;
249         __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
250 
251         if (S_ISDIR(inode->i_mode))
252                 mask |= FS_ISDIR;
253 
254         if (!(file->f_mode & FMODE_NONOTIFY)) {
255                 fsnotify_parent(path, NULL, mask);
256                 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
257         }
258 }
259 
260 /*
261  * fsnotify_xattr - extended attributes were changed
262  */
263 static inline void fsnotify_xattr(struct dentry *dentry)
264 {
265         struct inode *inode = dentry->d_inode;
266         __u32 mask = FS_ATTRIB;
267 
268         if (S_ISDIR(inode->i_mode))
269                 mask |= FS_ISDIR;
270 
271         fsnotify_parent(NULL, dentry, mask);
272         fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
273 }
274 
275 /*
276  * fsnotify_change - notify_change event.  file was modified and/or metadata
277  * was changed.
278  */
279 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
280 {
281         struct inode *inode = dentry->d_inode;
282         __u32 mask = 0;
283 
284         if (ia_valid & ATTR_UID)
285                 mask |= FS_ATTRIB;
286         if (ia_valid & ATTR_GID)
287                 mask |= FS_ATTRIB;
288         if (ia_valid & ATTR_SIZE)
289                 mask |= FS_MODIFY;
290 
291         /* both times implies a utime(s) call */
292         if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
293                 mask |= FS_ATTRIB;
294         else if (ia_valid & ATTR_ATIME)
295                 mask |= FS_ACCESS;
296         else if (ia_valid & ATTR_MTIME)
297                 mask |= FS_MODIFY;
298 
299         if (ia_valid & ATTR_MODE)
300                 mask |= FS_ATTRIB;
301 
302         if (mask) {
303                 if (S_ISDIR(inode->i_mode))
304                         mask |= FS_ISDIR;
305 
306                 fsnotify_parent(NULL, dentry, mask);
307                 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
308         }
309 }
310 
311 #if defined(CONFIG_FSNOTIFY)    /* notify helpers */
312 
313 /*
314  * fsnotify_oldname_init - save off the old filename before we change it
315  */
316 static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name)
317 {
318         return kstrdup(name, GFP_KERNEL);
319 }
320 
321 /*
322  * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
323  */
324 static inline void fsnotify_oldname_free(const unsigned char *old_name)
325 {
326         kfree(old_name);
327 }
328 
329 #else   /* CONFIG_FSNOTIFY */
330 
331 static inline const char *fsnotify_oldname_init(const unsigned char *name)
332 {
333         return NULL;
334 }
335 
336 static inline void fsnotify_oldname_free(const unsigned char *old_name)
337 {
338 }
339 
340 #endif  /*  CONFIG_FSNOTIFY */
341 
342 #endif  /* _LINUX_FS_NOTIFY_H */
343 

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