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