[net-next-2.6.git] / include / linux / ceph / pagelist.h

#ifndef __FS_CEPH_PAGELIST_H
#define __FS_CEPH_PAGELIST_H

#include <linux/list.h>

struct ceph_pagelist {
	struct list_head head;
	void *mapped_tail;
	size_t length;
	size_t room;
	struct list_head free_list;
	size_t num_pages_free;
};

struct ceph_pagelist_cursor {
	struct ceph_pagelist *pl;   /* pagelist, for error checking */
	struct list_head *page_lru; /* page in list */
	size_t room;		    /* room remaining to reset to */
};

static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
{
	INIT_LIST_HEAD(&pl->head);
	pl->mapped_tail = NULL;
	pl->length = 0;
	pl->room = 0;
	INIT_LIST_HEAD(&pl->free_list);
	pl->num_pages_free = 0;
}

extern int ceph_pagelist_release(struct ceph_pagelist *pl);

extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);

extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);

extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);

extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
				     struct ceph_pagelist_cursor *c);

extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
				  struct ceph_pagelist_cursor *c);

static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)
{
	__le64 ev = cpu_to_le64(v);
	return ceph_pagelist_append(pl, &ev, sizeof(ev));
}
static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v)
{
	__le32 ev = cpu_to_le32(v);
	return ceph_pagelist_append(pl, &ev, sizeof(ev));
}
static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v)
{
	__le16 ev = cpu_to_le16(v);
	return ceph_pagelist_append(pl, &ev, sizeof(ev));
}
static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
{
	return ceph_pagelist_append(pl, &v, 1);
}
static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl,
					      char *s, size_t len)
{
	int ret = ceph_pagelist_encode_32(pl, len);
	if (ret)
		return ret;
	if (len)
		return ceph_pagelist_append(pl, s, len);
	return 0;
}

#endif
Commit	Line	Data
58bb3b37 SW	1	#ifndef __FS_CEPH_PAGELIST_H
	2	#define __FS_CEPH_PAGELIST_H
	3
	4	#include <linux/list.h>
	5
	6	struct ceph_pagelist {
	7	struct list_head head;
	8	void *mapped_tail;
	9	size_t length;
	10	size_t room;
ac0b74d8 GF	11	struct list_head free_list;
	12	size_t num_pages_free;
	13	};
	14
	15	struct ceph_pagelist_cursor {
	16	struct ceph_pagelist pl; / pagelist, for error checking */
	17	struct list_head page_lru; / page in list */
	18	size_t room; /* room remaining to reset to */
58bb3b37 SW	19	};
	20
	21	static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
	22	{
	23	INIT_LIST_HEAD(&pl->head);
	24	pl->mapped_tail = NULL;
	25	pl->length = 0;
	26	pl->room = 0;
ac0b74d8 GF	27	INIT_LIST_HEAD(&pl->free_list);
ac0b74d8 GF	28	pl->num_pages_free = 0;
58bb3b37	29	}
ac0b74d8	30
58bb3b37 SW	31	extern int ceph_pagelist_release(struct ceph_pagelist *pl);
58bb3b37 SW	32
68b4476b	33	extern int ceph_pagelist_append(struct ceph_pagelist pl, const void d, size_t l);
58bb3b37	34
ac0b74d8 GF	35	extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
	36
	37	extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
	38
	39	extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
	40	struct ceph_pagelist_cursor *c);
	41
	42	extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
	43	struct ceph_pagelist_cursor *c);
	44
58bb3b37 SW	45	static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)
	46	{
	47	__le64 ev = cpu_to_le64(v);
	48	return ceph_pagelist_append(pl, &ev, sizeof(ev));
	49	}
	50	static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v)
	51	{
	52	__le32 ev = cpu_to_le32(v);
	53	return ceph_pagelist_append(pl, &ev, sizeof(ev));
	54	}
	55	static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v)
	56	{
	57	__le16 ev = cpu_to_le16(v);
	58	return ceph_pagelist_append(pl, &ev, sizeof(ev));
	59	}
	60	static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
	61	{
	62	return ceph_pagelist_append(pl, &v, 1);
	63	}
	64	static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl,
	65	char *s, size_t len)
	66	{
	67	int ret = ceph_pagelist_encode_32(pl, len);
	68	if (ret)
	69	return ret;
	70	if (len)
	71	return ceph_pagelist_append(pl, s, len);
	72	return 0;
	73	}
	74
	75	#endif