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