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

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