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