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, 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 const char *new_name = moved->d_name.name; 77 78 if (old_dir == new_dir) 79 old_dir_mask |= FS_DN_RENAME; 80 81 if (isdir) { 82 isdir = IN_ISDIR; 83 old_dir_mask |= FS_IN_ISDIR; 84 new_dir_mask |= FS_IN_ISDIR; 85 } 86 87 inotify_inode_queue_event(old_dir, IN_MOVED_FROM|isdir, in_cookie, old_name, 88 source); 89 inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, in_cookie, new_name, 90 source); 91 92 fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE, old_name, fs_cookie); 93 fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE, new_name, fs_cookie); 94 95 if (target) { 96 inotify_inode_queue_event(target, IN_DELETE_SELF, 0, NULL, NULL); 97 inotify_inode_is_dead(target); 98 99 /* this is really a link_count change not a removal */ 100 fsnotify_link_count(target); 101 } 102 103 if (source) { 104 inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL); 105 fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0); 106 } 107 audit_inode_child(moved, new_dir); 108 } 109 110 /* 111 * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed 112 */ 113 static inline void fsnotify_inode_delete(struct inode *inode) 114 { 115 __fsnotify_inode_delete(inode); 116 } 117 118 /* 119 * fsnotify_nameremove - a filename was removed from a directory 120 */ 121 static inline void fsnotify_nameremove(struct dentry *dentry, int isdir) 122 { 123 __u32 mask = FS_DELETE; 124 125 if (isdir) 126 mask |= FS_IN_ISDIR; 127 128 fsnotify_parent(dentry, mask); 129 } 130 131 /* 132 * fsnotify_inoderemove - an inode is going away 133 */ 134 static inline void fsnotify_inoderemove(struct inode *inode) 135 { 136 inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL, NULL); 137 inotify_inode_is_dead(inode); 138 139 fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0); 140 __fsnotify_inode_delete(inode); 141 } 142 143 /* 144 * fsnotify_create - 'name' was linked in 145 */ 146 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry) 147 { 148 inotify_inode_queue_event(inode, IN_CREATE, 0, dentry->d_name.name, 149 dentry->d_inode); 150 audit_inode_child(dentry, inode); 151 152 fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); 153 } 154 155 /* 156 * fsnotify_link - new hardlink in 'inode' directory 157 * Note: We have to pass also the linked inode ptr as some filesystems leave 158 * new_dentry->d_inode NULL and instantiate inode pointer later 159 */ 160 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry) 161 { 162 inotify_inode_queue_event(dir, IN_CREATE, 0, new_dentry->d_name.name, 163 inode); 164 fsnotify_link_count(inode); 165 audit_inode_child(new_dentry, dir); 166 167 fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0); 168 } 169 170 /* 171 * fsnotify_mkdir - directory 'name' was created 172 */ 173 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry) 174 { 175 __u32 mask = (FS_CREATE | FS_IN_ISDIR); 176 struct inode *d_inode = dentry->d_inode; 177 178 inotify_inode_queue_event(inode, mask, 0, dentry->d_name.name, d_inode); 179 audit_inode_child(dentry, inode); 180 181 fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); 182 } 183 184 /* 185 * fsnotify_access - file was read 186 */ 187 static inline void fsnotify_access(struct dentry *dentry) 188 { 189 struct inode *inode = dentry->d_inode; 190 __u32 mask = FS_ACCESS; 191 192 if (S_ISDIR(inode->i_mode)) 193 mask |= FS_IN_ISDIR; 194 195 inotify_inode_queue_event(inode, mask, 0, NULL, NULL); 196 197 fsnotify_parent(dentry, mask); 198 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); 199 } 200 201 /* 202 * fsnotify_modify - file was modified 203 */ 204 static inline void fsnotify_modify(struct dentry *dentry) 205 { 206 struct inode *inode = dentry->d_inode; 207 __u32 mask = FS_MODIFY; 208 209 if (S_ISDIR(inode->i_mode)) 210 mask |= FS_IN_ISDIR; 211 212 inotify_inode_queue_event(inode, mask, 0, NULL, NULL); 213 214 fsnotify_parent(dentry, mask); 215 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); 216 } 217 218 /* 219 * fsnotify_open - file was opened 220 */ 221 static inline void fsnotify_open(struct dentry *dentry) 222 { 223 struct inode *inode = dentry->d_inode; 224 __u32 mask = FS_OPEN; 225 226 if (S_ISDIR(inode->i_mode)) 227 mask |= FS_IN_ISDIR; 228 229 inotify_inode_queue_event(inode, mask, 0, NULL, NULL); 230 231 fsnotify_parent(dentry, mask); 232 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); 233 } 234 235 /* 236 * fsnotify_close - file was closed 237 */ 238 static inline void fsnotify_close(struct file *file) 239 { 240 struct dentry *dentry = file->f_path.dentry; 241 struct inode *inode = dentry->d_inode; 242 fmode_t mode = file->f_mode; 243 __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE; 244 245 if (S_ISDIR(inode->i_mode)) 246 mask |= FS_IN_ISDIR; 247 248 inotify_inode_queue_event(inode, mask, 0, NULL, NULL); 249 250 fsnotify_parent(dentry, mask); 251 fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0); 252 } 253 254 /* 255 * fsnotify_xattr - extended attributes were changed 256 */ 257 static inline void fsnotify_xattr(struct dentry *dentry) 258 { 259 struct inode *inode = dentry->d_inode; 260 __u32 mask = FS_ATTRIB; 261 262 if (S_ISDIR(inode->i_mode)) 263 mask |= FS_IN_ISDIR; 264 265 inotify_inode_queue_event(inode, mask, 0, NULL, NULL); 266 267 fsnotify_parent(dentry, mask); 268 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); 269 } 270 271 /* 272 * fsnotify_change - notify_change event. file was modified and/or metadata 273 * was changed. 274 */ 275 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid) 276 { 277 struct inode *inode = dentry->d_inode; 278 __u32 mask = 0; 279 280 if (ia_valid & ATTR_UID) 281 mask |= FS_ATTRIB; 282 if (ia_valid & ATTR_GID) 283 mask |= FS_ATTRIB; 284 if (ia_valid & ATTR_SIZE) 285 mask |= FS_MODIFY; 286 287 /* both times implies a utime(s) call */ 288 if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) 289 mask |= FS_ATTRIB; 290 else if (ia_valid & ATTR_ATIME) 291 mask |= FS_ACCESS; 292 else if (ia_valid & ATTR_MTIME) 293 mask |= FS_MODIFY; 294 295 if (ia_valid & ATTR_MODE) 296 mask |= FS_ATTRIB; 297 298 if (mask) { 299 if (S_ISDIR(inode->i_mode)) 300 mask |= FS_IN_ISDIR; 301 inotify_inode_queue_event(inode, mask, 0, NULL, NULL); 302 303 fsnotify_parent(dentry, mask); 304 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); 305 } 306 } 307 308 #if defined(CONFIG_INOTIFY) || defined(CONFIG_FSNOTIFY) /* notify helpers */ 309 310 /* 311 * fsnotify_oldname_init - save off the old filename before we change it 312 */ 313 static inline const char *fsnotify_oldname_init(const char *name) 314 { 315 return kstrdup(name, GFP_KERNEL); 316 } 317 318 /* 319 * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init 320 */ 321 static inline void fsnotify_oldname_free(const char *old_name) 322 { 323 kfree(old_name); 324 } 325 326 #else /* CONFIG_INOTIFY || CONFIG_FSNOTIFY */ 327 328 static inline const char *fsnotify_oldname_init(const char *name) 329 { 330 return NULL; 331 } 332 333 static inline void fsnotify_oldname_free(const char *old_name) 334 { 335 } 336 337 #endif /* ! CONFIG_INOTIFY */ 338 339 #endif /* _LINUX_FS_NOTIFY_H */ 340