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