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 #ifdef __KERNEL__
  15
  16 #include <linux/dnotify.h>
  17 #include <linux/inotify.h>
  18 #include <linux/audit.h>
  19
  20 /*
  21  * fsnotify_d_instantiate - instantiate a dentry for inode
  22  * Called with dcache_lock held.
  23  */
  24 static inline void fsnotify_d_instantiate(struct dentry *entry,
  25                                                 struct inode *inode)
  26 {
  27         inotify_d_instantiate(entry, inode);
  28 }
  29
  30 /*
  31  * fsnotify_d_move - entry has been moved
  32  * Called with dcache_lock and entry->d_lock held.
  33  */
  34 static inline void fsnotify_d_move(struct dentry *entry)
  35 {
  36         inotify_d_move(entry);
  37 }
  38
  39 /*
  40  * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
  41  */
  42 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
  43                                  const char *old_name, const char *new_name,
  44                                  int isdir, struct inode *target, struct dentry *moved)
  45 {
  46         struct inode *source = moved->d_inode;
  47         u32 cookie = inotify_get_cookie();
  48
  49         if (old_dir == new_dir)
  50                 inode_dir_notify(old_dir, DN_RENAME);
  51         else {
  52                 inode_dir_notify(old_dir, DN_DELETE);
  53                 inode_dir_notify(new_dir, DN_CREATE);
  54         }
  55
  56         if (isdir)
  57                 isdir = IN_ISDIR;
  58         inotify_inode_queue_event(old_dir, IN_MOVED_FROM|isdir,cookie,old_name,
  59                                   source);
  60         inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, cookie, new_name,
  61                                   source);
  62
  63         if (target) {
  64                 inotify_inode_queue_event(target, IN_DELETE_SELF, 0, NULL, NULL);
  65                 inotify_inode_is_dead(target);
  66         }
  67
  68         if (source) {
  69                 inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
  70         }
  71         audit_inode_child(new_name, moved, new_dir);
  72 }
  73
  74 /*
  75  * fsnotify_nameremove - a filename was removed from a directory
  76  */
  77 static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
  78 {
  79         if (isdir)
  80                 isdir = IN_ISDIR;
  81         dnotify_parent(dentry, DN_DELETE);
  82         inotify_dentry_parent_queue_event(dentry, IN_DELETE|isdir, 0, dentry->d_name.name);
  83 }
  84
  85 /*
  86  * fsnotify_inoderemove - an inode is going away
  87  */
  88 static inline void fsnotify_inoderemove(struct inode *inode)
  89 {
  90         inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL, NULL);
  91         inotify_inode_is_dead(inode);
  92 }
  93
  94 /*
  95  * fsnotify_link_count - inode's link count changed
  96  */
  97 static inline void fsnotify_link_count(struct inode *inode)
  98 {
  99         inotify_inode_queue_event(inode, IN_ATTRIB, 0, NULL, NULL);
 100 }
 101
 102 /*
 103  * fsnotify_create - 'name' was linked in
 104  */
 105 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
 106 {
 107         inode_dir_notify(inode, DN_CREATE);
 108         inotify_inode_queue_event(inode, IN_CREATE, 0, dentry->d_name.name,
 109                                   dentry->d_inode);
 110         audit_inode_child(dentry->d_name.name, dentry, inode);
 111 }
 112
 113 /*
 114  * fsnotify_link - new hardlink in 'inode' directory
 115  * Note: We have to pass also the linked inode ptr as some filesystems leave
 116  *   new_dentry->d_inode NULL and instantiate inode pointer later
 117  */
 118 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
 119 {
 120         inode_dir_notify(dir, DN_CREATE);
 121         inotify_inode_queue_event(dir, IN_CREATE, 0, new_dentry->d_name.name,
 122                                   inode);
 123         fsnotify_link_count(inode);
 124         audit_inode_child(new_dentry->d_name.name, new_dentry, dir);
 125 }
 126
 127 /*
 128  * fsnotify_mkdir - directory 'name' was created
 129  */
 130 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
 131 {
 132         inode_dir_notify(inode, DN_CREATE);
 133         inotify_inode_queue_event(inode, IN_CREATE | IN_ISDIR, 0,
 134                                   dentry->d_name.name, dentry->d_inode);
 135         audit_inode_child(dentry->d_name.name, dentry, inode);
 136 }
 137
 138 /*
 139  * fsnotify_access - file was read
 140  */
 141 static inline void fsnotify_access(struct dentry *dentry)
 142 {
 143         struct inode *inode = dentry->d_inode;
 144         u32 mask = IN_ACCESS;
 145
 146         if (S_ISDIR(inode->i_mode))
 147                 mask |= IN_ISDIR;
 148
 149         dnotify_parent(dentry, DN_ACCESS);
 150         inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
 151         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 152 }
 153
 154 /*
 155  * fsnotify_modify - file was modified
 156  */
 157 static inline void fsnotify_modify(struct dentry *dentry)
 158 {
 159         struct inode *inode = dentry->d_inode;
 160         u32 mask = IN_MODIFY;
 161
 162         if (S_ISDIR(inode->i_mode))
 163                 mask |= IN_ISDIR;
 164
 165         dnotify_parent(dentry, DN_MODIFY);
 166         inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
 167         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 168 }
 169
 170 /*
 171  * fsnotify_open - file was opened
 172  */
 173 static inline void fsnotify_open(struct dentry *dentry)
 174 {
 175         struct inode *inode = dentry->d_inode;
 176         u32 mask = IN_OPEN;
 177
 178         if (S_ISDIR(inode->i_mode))
 179                 mask |= IN_ISDIR;
 180
 181         inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
 182         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 183 }
 184
 185 /*
 186  * fsnotify_close - file was closed
 187  */
 188 static inline void fsnotify_close(struct file *file)
 189 {
 190         struct dentry *dentry = file->f_path.dentry;
 191         struct inode *inode = dentry->d_inode;
 192         const char *name = dentry->d_name.name;
 193         mode_t mode = file->f_mode;
 194         u32 mask = (mode & FMODE_WRITE) ? IN_CLOSE_WRITE : IN_CLOSE_NOWRITE;
 195
 196         if (S_ISDIR(inode->i_mode))
 197                 mask |= IN_ISDIR;
 198
 199         inotify_dentry_parent_queue_event(dentry, mask, 0, name);
 200         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 201 }
 202
 203 /*
 204  * fsnotify_xattr - extended attributes were changed
 205  */
 206 static inline void fsnotify_xattr(struct dentry *dentry)
 207 {
 208         struct inode *inode = dentry->d_inode;
 209         u32 mask = IN_ATTRIB;
 210
 211         if (S_ISDIR(inode->i_mode))
 212                 mask |= IN_ISDIR;
 213
 214         inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
 215         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 216 }
 217
 218 /*
 219  * fsnotify_change - notify_change event.  file was modified and/or metadata
 220  * was changed.
 221  */
 222 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
 223 {
 224         struct inode *inode = dentry->d_inode;
 225         int dn_mask = 0;
 226         u32 in_mask = 0;
 227
 228         if (ia_valid & ATTR_UID) {
 229                 in_mask |= IN_ATTRIB;
 230                 dn_mask |= DN_ATTRIB;
 231         }
 232         if (ia_valid & ATTR_GID) {
 233                 in_mask |= IN_ATTRIB;
 234                 dn_mask |= DN_ATTRIB;
 235         }
 236         if (ia_valid & ATTR_SIZE) {
 237                 in_mask |= IN_MODIFY;
 238                 dn_mask |= DN_MODIFY;
 239         }
 240         /* both times implies a utime(s) call */
 241         if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
 242         {
 243                 in_mask |= IN_ATTRIB;
 244                 dn_mask |= DN_ATTRIB;
 245         } else if (ia_valid & ATTR_ATIME) {
 246                 in_mask |= IN_ACCESS;
 247                 dn_mask |= DN_ACCESS;
 248         } else if (ia_valid & ATTR_MTIME) {
 249                 in_mask |= IN_MODIFY;
 250                 dn_mask |= DN_MODIFY;
 251         }
 252         if (ia_valid & ATTR_MODE) {
 253                 in_mask |= IN_ATTRIB;
 254                 dn_mask |= DN_ATTRIB;
 255         }
 256
 257         if (dn_mask)
 258                 dnotify_parent(dentry, dn_mask);
 259         if (in_mask) {
 260                 if (S_ISDIR(inode->i_mode))
 261                         in_mask |= IN_ISDIR;
 262                 inotify_inode_queue_event(inode, in_mask, 0, NULL, NULL);
 263                 inotify_dentry_parent_queue_event(dentry, in_mask, 0,
 264                                                   dentry->d_name.name);
 265         }
 266 }
 267
 268 #ifdef CONFIG_INOTIFY   /* inotify helpers */
 269
 270 /*
 271  * fsnotify_oldname_init - save off the old filename before we change it
 272  */
 273 static inline const char *fsnotify_oldname_init(const char *name)
 274 {
 275         return kstrdup(name, GFP_KERNEL);
 276 }
 277
 278 /*
 279  * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
 280  */
 281 static inline void fsnotify_oldname_free(const char *old_name)
 282 {
 283         kfree(old_name);
 284 }
 285
 286 #else   /* CONFIG_INOTIFY */
 287
 288 static inline const char *fsnotify_oldname_init(const char *name)
 289 {
 290         return NULL;
 291 }
 292
 293 static inline void fsnotify_oldname_free(const char *old_name)
 294 {
 295 }
 296
 297 #endif  /* ! CONFIG_INOTIFY */
 298
 299 #endif  /* __KERNEL__ */
 300
 301 #endif  /* _LINUX_FS_NOTIFY_H */