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