fs/notify/fsnotify.h

   1 #ifndef __FS_NOTIFY_FSNOTIFY_H_
   2 #define __FS_NOTIFY_FSNOTIFY_H_
   3
   4 #include <linux/list.h>
   5 #include <linux/fsnotify.h>
   6 #include <linux/srcu.h>
   7 #include <linux/types.h>
   8
   9 #include "../mount.h"
  10
  11 /* destroy all events sitting in this groups notification queue */
  12 extern void fsnotify_flush_notify(struct fsnotify_group *group);
  13
  14 /* protects reads of inode and vfsmount marks list */
  15 extern struct srcu_struct fsnotify_mark_srcu;
  16
  17 /* Calculate mask of events for a list of marks */
  18 extern u32 fsnotify_recalc_mask(struct hlist_head *head);
  19
  20 /* compare two groups for sorting of marks lists */
  21 extern int fsnotify_compare_groups(struct fsnotify_group *a,
  22                                    struct fsnotify_group *b);
  23
  24 extern void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *fsn_mark,
  25                                                 __u32 mask);
  26 /* Add mark to a proper place in mark list */
  27 extern int fsnotify_add_mark_list(struct hlist_head *head,
  28                                   struct fsnotify_mark *mark,
  29                                   int allow_dups);
  30 /* add a mark to an inode */
  31 extern int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
  32                                    struct fsnotify_group *group, struct inode *inode,
  33                                    int allow_dups);
  34 /* add a mark to a vfsmount */
  35 extern int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
  36                                       struct fsnotify_group *group, struct vfsmount *mnt,
  37                                       int allow_dups);
  38
  39 /* vfsmount specific destruction of a mark */
  40 extern void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark);
  41 /* inode specific destruction of a mark */
  42 extern void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark);
  43 /* Find mark belonging to given group in the list of marks */
  44 extern struct fsnotify_mark *fsnotify_find_mark(struct hlist_head *head,
  45                                                 struct fsnotify_group *group);
  46 /* Destroy all marks in the given list protected by 'lock' */
  47 extern void fsnotify_destroy_marks(struct hlist_head *head, spinlock_t *lock);
  48 /* run the list of all marks associated with inode and destroy them */
  49 static inline void fsnotify_clear_marks_by_inode(struct inode *inode)
  50 {
  51         fsnotify_destroy_marks(&inode->i_fsnotify_marks, &inode->i_lock);
  52 }
  53 /* run the list of all marks associated with vfsmount and destroy them */
  54 static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
  55 {
  56         fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks,
  57                                &mnt->mnt_root->d_lock);
  58 }
  59 /* prepare for freeing all marks associated with given group */
  60 extern void fsnotify_detach_group_marks(struct fsnotify_group *group);
  61 /*
  62  * wait for fsnotify_mark_srcu period to end and free all marks in destroy_list
  63  */
  64 extern void fsnotify_mark_destroy_list(void);
  65
  66 /*
  67  * update the dentry->d_flags of all of inode's children to indicate if inode cares
  68  * about events that happen to its children.
  69  */
  70 extern void __fsnotify_update_child_dentry_flags(struct inode *inode);
  71
  72 /* allocate and destroy and event holder to attach events to notification/access queues */
  73 extern struct fsnotify_event_holder *fsnotify_alloc_event_holder(void);
  74 extern void fsnotify_destroy_event_holder(struct fsnotify_event_holder *holder);
  75
  76 #endif  /* __FS_NOTIFY_FSNOTIFY_H_ */