| 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 */ |