[linux-2.6-block.git] / fs / notify / fsnotify.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __FS_NOTIFY_FSNOTIFY_H_
#define __FS_NOTIFY_FSNOTIFY_H_

#include <linux/list.h>
#include <linux/fsnotify.h>
#include <linux/srcu.h>
#include <linux/types.h>

#include "../mount.h"

/*
 * fsnotify_connp_t is what we embed in objects which connector can be attached
 * to.
 */
typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;

static inline struct inode *fsnotify_conn_inode(
				struct fsnotify_mark_connector *conn)
{
	return conn->obj;
}

static inline struct mount *fsnotify_conn_mount(
				struct fsnotify_mark_connector *conn)
{
	return real_mount(conn->obj);
}

static inline struct super_block *fsnotify_conn_sb(
				struct fsnotify_mark_connector *conn)
{
	return conn->obj;
}

static inline struct mnt_namespace *fsnotify_conn_mntns(
				struct fsnotify_mark_connector *conn)
{
	return conn->obj;
}

static inline struct super_block *fsnotify_object_sb(void *obj,
			enum fsnotify_obj_type obj_type)
{
	switch (obj_type) {
	case FSNOTIFY_OBJ_TYPE_INODE:
		return ((struct inode *)obj)->i_sb;
	case FSNOTIFY_OBJ_TYPE_VFSMOUNT:
		return ((struct vfsmount *)obj)->mnt_sb;
	case FSNOTIFY_OBJ_TYPE_SB:
		return (struct super_block *)obj;
	default:
		return NULL;
	}
}

static inline struct super_block *fsnotify_connector_sb(
				struct fsnotify_mark_connector *conn)
{
	return fsnotify_object_sb(conn->obj, conn->type);
}

static inline fsnotify_connp_t *fsnotify_sb_marks(struct super_block *sb)
{
	struct fsnotify_sb_info *sbinfo = fsnotify_sb_info(sb);

	return sbinfo ? &sbinfo->sb_marks : NULL;
}

/* destroy all events sitting in this groups notification queue */
extern void fsnotify_flush_notify(struct fsnotify_group *group);

/* protects reads of inode and vfsmount marks list */
extern struct srcu_struct fsnotify_mark_srcu;

/* compare two groups for sorting of marks lists */
extern int fsnotify_compare_groups(struct fsnotify_group *a,
				   struct fsnotify_group *b);

/* Destroy all marks attached to an object via connector */
extern void fsnotify_destroy_marks(fsnotify_connp_t *connp);
/* run the list of all marks associated with inode and destroy them */
static inline void fsnotify_clear_marks_by_inode(struct inode *inode)
{
	fsnotify_destroy_marks(&inode->i_fsnotify_marks);
}
/* run the list of all marks associated with vfsmount and destroy them */
static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
{
	fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks);
}
/* run the list of all marks associated with sb and destroy them */
static inline void fsnotify_clear_marks_by_sb(struct super_block *sb)
{
	fsnotify_destroy_marks(fsnotify_sb_marks(sb));
}

static inline void fsnotify_clear_marks_by_mntns(struct mnt_namespace *mntns)
{
	fsnotify_destroy_marks(&mntns->n_fsnotify_marks);
}

/*
 * update the dentry->d_flags of all of inode's children to indicate if inode cares
 * about events that happen to its children.
 */
extern void fsnotify_set_children_dentry_flags(struct inode *inode);

extern struct kmem_cache *fsnotify_mark_connector_cachep;

#endif	/* __FS_NOTIFY_FSNOTIFY_H_ */
Commit	Line	Data
	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 mnt_namespace *fsnotify_conn_mntns(
	37	struct fsnotify_mark_connector *conn)
	38	{
	39	return conn->obj;
	40	}
	41
	42	static inline struct super_block fsnotify_object_sb(void obj,
	43	enum fsnotify_obj_type obj_type)
	44	{
	45	switch (obj_type) {
	46	case FSNOTIFY_OBJ_TYPE_INODE:
	47	return ((struct inode *)obj)->i_sb;
	48	case FSNOTIFY_OBJ_TYPE_VFSMOUNT:
	49	return ((struct vfsmount *)obj)->mnt_sb;
	50	case FSNOTIFY_OBJ_TYPE_SB:
	51	return (struct super_block *)obj;
	52	default:
	53	return NULL;
	54	}
	55	}
	56
	57	static inline struct super_block *fsnotify_connector_sb(
	58	struct fsnotify_mark_connector *conn)
	59	{
	60	return fsnotify_object_sb(conn->obj, conn->type);
	61	}
	62
	63	static inline fsnotify_connp_t fsnotify_sb_marks(struct super_block sb)
	64	{
	65	struct fsnotify_sb_info *sbinfo = fsnotify_sb_info(sb);
	66
	67	return sbinfo ? &sbinfo->sb_marks : NULL;
	68	}
	69
	70	/* destroy all events sitting in this groups notification queue */
	71	extern void fsnotify_flush_notify(struct fsnotify_group *group);
	72
	73	/* protects reads of inode and vfsmount marks list */
	74	extern struct srcu_struct fsnotify_mark_srcu;
	75
	76	/* compare two groups for sorting of marks lists */
	77	extern int fsnotify_compare_groups(struct fsnotify_group *a,
	78	struct fsnotify_group *b);
	79
	80	/* Destroy all marks attached to an object via connector */
	81	extern void fsnotify_destroy_marks(fsnotify_connp_t *connp);
	82	/* run the list of all marks associated with inode and destroy them */
	83	static inline void fsnotify_clear_marks_by_inode(struct inode *inode)
	84	{
	85	fsnotify_destroy_marks(&inode->i_fsnotify_marks);
	86	}
	87	/* run the list of all marks associated with vfsmount and destroy them */
	88	static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
	89	{
	90	fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks);
	91	}
	92	/* run the list of all marks associated with sb and destroy them */
	93	static inline void fsnotify_clear_marks_by_sb(struct super_block *sb)
	94	{
	95	fsnotify_destroy_marks(fsnotify_sb_marks(sb));
	96	}
	97
	98	static inline void fsnotify_clear_marks_by_mntns(struct mnt_namespace *mntns)
	99	{
	100	fsnotify_destroy_marks(&mntns->n_fsnotify_marks);
	101	}
	102
	103	/*
	104	* update the dentry->d_flags of all of inode's children to indicate if inode cares
	105	* about events that happen to its children.
	106	*/
	107	extern void fsnotify_set_children_dentry_flags(struct inode *inode);
	108
	109	extern struct kmem_cache *fsnotify_mark_connector_cachep;
	110
	111	#endif /* __FS_NOTIFY_FSNOTIFY_H_ */