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