include/linux/fsnotify.h

   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/audit.h>
  17
  18 /*
  19  * fsnotify_d_instantiate - instantiate a dentry for inode
  20  * Called with dcache_lock held.
  21  */
  22 static inline void fsnotify_d_instantiate(struct dentry *entry,
  23                                                 struct inode *inode)
  24 {
  25         inotify_d_instantiate(entry, inode);
  26 }
  27
  28 /*
  29  * fsnotify_d_move - entry has been moved
  30  * Called with dcache_lock and entry->d_lock held.
  31  */
  32 static inline void fsnotify_d_move(struct dentry *entry)
  33 {
  34         inotify_d_move(entry);
  35 }
  36
  37 /*
  38  * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
  39  */
  40 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
  41                                  const char *old_name, const char *new_name,
  42                                  int isdir, struct inode *target, struct dentry *moved)
  43 {
  44         struct inode *source = moved->d_inode;
  45         u32 cookie = inotify_get_cookie();
  46
  47         if (old_dir == new_dir)
  48                 inode_dir_notify(old_dir, DN_RENAME);
  49         else {
  50                 inode_dir_notify(old_dir, DN_DELETE);
  51                 inode_dir_notify(new_dir, DN_CREATE);
  52         }
  53
  54         if (isdir)
  55                 isdir = IN_ISDIR;
  56         inotify_inode_queue_event(old_dir, IN_MOVED_FROM|isdir,cookie,old_name,
  57                                   source);
  58         inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, cookie, new_name,
  59                                   source);
  60
  61         if (target) {
  62                 inotify_inode_queue_event(target, IN_DELETE_SELF, 0, NULL, NULL);
  63                 inotify_inode_is_dead(target);
  64         }
  65
  66         if (source) {
  67                 inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
  68         }
  69         audit_inode_child(new_name, moved, new_dir);
  70 }
  71
  72 /*
  73  * fsnotify_nameremove - a filename was removed from a directory
  74  */
  75 static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
  76 {
  77         if (isdir)
  78                 isdir = IN_ISDIR;
  79         dnotify_parent(dentry, DN_DELETE);
  80         inotify_dentry_parent_queue_event(dentry, IN_DELETE|isdir, 0, dentry->d_name.name);
  81 }
  82
  83 /*
  84  * fsnotify_inoderemove - an inode is going away
  85  */
  86 static inline void fsnotify_inoderemove(struct inode *inode)
  87 {
  88         inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL, NULL);
  89         inotify_inode_is_dead(inode);
  90 }
  91
  92 /*
  93  * fsnotify_link_count - inode's link count changed
  94  */
  95 static inline void fsnotify_link_count(struct inode *inode)
  96 {
  97         inotify_inode_queue_event(inode, IN_ATTRIB, 0, NULL, NULL);
  98 }
  99
 100 /*
 101  * fsnotify_create - 'name' was linked in
 102  */
 103 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
 104 {
 105         inode_dir_notify(inode, DN_CREATE);
 106         inotify_inode_queue_event(inode, IN_CREATE, 0, dentry->d_name.name,
 107                                   dentry->d_inode);
 108         audit_inode_child(dentry->d_name.name, dentry, inode);
 109 }
 110
 111 /*
 112  * fsnotify_link - new hardlink in 'inode' directory
 113  * Note: We have to pass also the linked inode ptr as some filesystems leave
 114  *   new_dentry->d_inode NULL and instantiate inode pointer later
 115  */
 116 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
 117 {
 118         inode_dir_notify(dir, DN_CREATE);
 119         inotify_inode_queue_event(dir, IN_CREATE, 0, new_dentry->d_name.name,
 120                                   inode);
 121         fsnotify_link_count(inode);
 122         audit_inode_child(new_dentry->d_name.name, new_dentry, dir);
 123 }
 124
 125 /*
 126  * fsnotify_mkdir - directory 'name' was created
 127  */
 128 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
 129 {
 130         inode_dir_notify(inode, DN_CREATE);
 131         inotify_inode_queue_event(inode, IN_CREATE | IN_ISDIR, 0,
 132                                   dentry->d_name.name, dentry->d_inode);
 133         audit_inode_child(dentry->d_name.name, dentry, inode);
 134 }
 135
 136 /*
 137  * fsnotify_access - file was read
 138  */
 139 static inline void fsnotify_access(struct dentry *dentry)
 140 {
 141         struct inode *inode = dentry->d_inode;
 142         u32 mask = IN_ACCESS;
 143
 144         if (S_ISDIR(inode->i_mode))
 145                 mask |= IN_ISDIR;
 146
 147         dnotify_parent(dentry, DN_ACCESS);
 148         inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
 149         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 150 }
 151
 152 /*
 153  * fsnotify_modify - file was modified
 154  */
 155 static inline void fsnotify_modify(struct dentry *dentry)
 156 {
 157         struct inode *inode = dentry->d_inode;
 158         u32 mask = IN_MODIFY;
 159
 160         if (S_ISDIR(inode->i_mode))
 161                 mask |= IN_ISDIR;
 162
 163         dnotify_parent(dentry, DN_MODIFY);
 164         inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
 165         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 166 }
 167
 168 /*
 169  * fsnotify_open - file was opened
 170  */
 171 static inline void fsnotify_open(struct dentry *dentry)
 172 {
 173         struct inode *inode = dentry->d_inode;
 174         u32 mask = IN_OPEN;
 175
 176         if (S_ISDIR(inode->i_mode))
 177                 mask |= IN_ISDIR;
 178
 179         inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
 180         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 181 }
 182
 183 /*
 184  * fsnotify_close - file was closed
 185  */
 186 static inline void fsnotify_close(struct file *file)
 187 {
 188         struct dentry *dentry = file->f_path.dentry;
 189         struct inode *inode = dentry->d_inode;
 190         const char *name = dentry->d_name.name;
 191         mode_t mode = file->f_mode;
 192         u32 mask = (mode & FMODE_WRITE) ? IN_CLOSE_WRITE : IN_CLOSE_NOWRITE;
 193
 194         if (S_ISDIR(inode->i_mode))
 195                 mask |= IN_ISDIR;
 196
 197         inotify_dentry_parent_queue_event(dentry, mask, 0, name);
 198         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 199 }
 200
 201 /*
 202  * fsnotify_xattr - extended attributes were changed
 203  */
 204 static inline void fsnotify_xattr(struct dentry *dentry)
 205 {
 206         struct inode *inode = dentry->d_inode;
 207         u32 mask = IN_ATTRIB;
 208
 209         if (S_ISDIR(inode->i_mode))
 210                 mask |= IN_ISDIR;
 211
 212         inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
 213         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 214 }
 215
 216 /*
 217  * fsnotify_change - notify_change event.  file was modified and/or metadata
 218  * was changed.
 219  */
 220 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
 221 {
 222         struct inode *inode = dentry->d_inode;
 223         int dn_mask = 0;
 224         u32 in_mask = 0;
 225
 226         if (ia_valid & ATTR_UID) {
 227                 in_mask |= IN_ATTRIB;
 228                 dn_mask |= DN_ATTRIB;
 229         }
 230         if (ia_valid & ATTR_GID) {
 231                 in_mask |= IN_ATTRIB;
 232                 dn_mask |= DN_ATTRIB;
 233         }
 234         if (ia_valid & ATTR_SIZE) {
 235                 in_mask |= IN_MODIFY;
 236                 dn_mask |= DN_MODIFY;
 237         }
 238         /* both times implies a utime(s) call */
 239         if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
 240         {
 241                 in_mask |= IN_ATTRIB;
 242                 dn_mask |= DN_ATTRIB;
 243         } else if (ia_valid & ATTR_ATIME) {
 244                 in_mask |= IN_ACCESS;
 245                 dn_mask |= DN_ACCESS;
 246         } else if (ia_valid & ATTR_MTIME) {
 247                 in_mask |= IN_MODIFY;
 248                 dn_mask |= DN_MODIFY;
 249         }
 250         if (ia_valid & ATTR_MODE) {
 251                 in_mask |= IN_ATTRIB;
 252                 dn_mask |= DN_ATTRIB;
 253         }
 254
 255         if (dn_mask)
 256                 dnotify_parent(dentry, dn_mask);
 257         if (in_mask) {
 258                 if (S_ISDIR(inode->i_mode))
 259                         in_mask |= IN_ISDIR;
 260                 inotify_inode_queue_event(inode, in_mask, 0, NULL, NULL);
 261                 inotify_dentry_parent_queue_event(dentry, in_mask, 0,
 262                                                   dentry->d_name.name);
 263         }
 264 }
 265
 266 #ifdef CONFIG_INOTIFY   /* inotify helpers */
 267
 268 /*
 269  * fsnotify_oldname_init - save off the old filename before we change it
 270  */
 271 static inline const char *fsnotify_oldname_init(const char *name)
 272 {
 273         return kstrdup(name, GFP_KERNEL);
 274 }
 275
 276 /*
 277  * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
 278  */
 279 static inline void fsnotify_oldname_free(const char *old_name)
 280 {
 281         kfree(old_name);
 282 }
 283
 284 #else   /* CONFIG_INOTIFY */
 285
 286 static inline const char *fsnotify_oldname_init(const char *name)
 287 {
 288         return NULL;
 289 }
 290
 291 static inline void fsnotify_oldname_free(const char *old_name)
 292 {
 293 }
 294
 295 #endif  /* ! CONFIG_INOTIFY */
 296
 297 #endif  /* _LINUX_FS_NOTIFY_H */