~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.6 ] ~ [ linux-5.4.22 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.106 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.171 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.214 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.214 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp