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