fs/notify/fsnotify.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __FS_NOTIFY_FSNOTIFY_H_
   3 #define __FS_NOTIFY_FSNOTIFY_H_
   4
   5 #include <linux/list.h>
   6 #include <linux/fsnotify.h>
   7 #include <linux/srcu.h>
   8 #include <linux/types.h>
   9
  10 #include "../mount.h"
  11
  12 /*
  13  * fsnotify_connp_t is what we embed in objects which connector can be attached
  14  * to.
  15  */
  16 typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
  17
  18 static inline struct inode *fsnotify_conn_inode(
  19                                 struct fsnotify_mark_connector *conn)
  20 {
  21         return conn->obj;
  22 }
  23
  24 static inline struct mount *fsnotify_conn_mount(
  25                                 struct fsnotify_mark_connector *conn)
  26 {
  27         return real_mount(conn->obj);
  28 }
  29
  30 static inline struct super_block *fsnotify_conn_sb(
  31                                 struct fsnotify_mark_connector *conn)
  32 {
  33         return conn->obj;
  34 }
  35
  36 static inline struct super_block *fsnotify_object_sb(void *obj,
  37                         enum fsnotify_obj_type obj_type)
  38 {
  39         switch (obj_type) {
  40         case FSNOTIFY_OBJ_TYPE_INODE:
  41                 return ((struct inode *)obj)->i_sb;
  42         case FSNOTIFY_OBJ_TYPE_VFSMOUNT:
  43                 return ((struct vfsmount *)obj)->mnt_sb;
  44         case FSNOTIFY_OBJ_TYPE_SB:
  45                 return (struct super_block *)obj;
  46         default:
  47                 return NULL;
  48         }
  49 }
  50
  51 static inline struct super_block *fsnotify_connector_sb(
  52                                 struct fsnotify_mark_connector *conn)
  53 {
  54         return fsnotify_object_sb(conn->obj, conn->type);
  55 }
  56
  57 static inline fsnotify_connp_t *fsnotify_sb_marks(struct super_block *sb)
  58 {
  59         struct fsnotify_sb_info *sbinfo = fsnotify_sb_info(sb);
  60
  61         return sbinfo ? &sbinfo->sb_marks : NULL;
  62 }
  63
  64 /* destroy all events sitting in this groups notification queue */
  65 extern void fsnotify_flush_notify(struct fsnotify_group *group);
  66
  67 /* protects reads of inode and vfsmount marks list */
  68 extern struct srcu_struct fsnotify_mark_srcu;
  69
  70 /* compare two groups for sorting of marks lists */
  71 extern int fsnotify_compare_groups(struct fsnotify_group *a,
  72                                    struct fsnotify_group *b);
  73
  74 /* Destroy all marks attached to an object via connector */
  75 extern void fsnotify_destroy_marks(fsnotify_connp_t *connp);
  76 /* run the list of all marks associated with inode and destroy them */
  77 static inline void fsnotify_clear_marks_by_inode(struct inode *inode)
  78 {
  79         fsnotify_destroy_marks(&inode->i_fsnotify_marks);
  80 }
  81 /* run the list of all marks associated with vfsmount and destroy them */
  82 static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
  83 {
  84         fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks);
  85 }
  86 /* run the list of all marks associated with sb and destroy them */
  87 static inline void fsnotify_clear_marks_by_sb(struct super_block *sb)
  88 {
  89         fsnotify_destroy_marks(fsnotify_sb_marks(sb));
  90 }
  91
  92 /*
  93  * update the dentry->d_flags of all of inode's children to indicate if inode cares
  94  * about events that happen to its children.
  95  */
  96 extern void fsnotify_set_children_dentry_flags(struct inode *inode);
  97
  98 extern struct kmem_cache *fsnotify_mark_connector_cachep;
  99
 100 #endif  /* __FS_NOTIFY_FSNOTIFY_H_ */