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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef __FS_CEPH_PAGELIST_H
- #define __FS_CEPH_PAGELIST_H
- #include <asm/byteorder.h>
- #include <linux/refcount.h>
- #include <linux/list.h>
- #include <linux/types.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;
- refcount_t refcnt;
- };
- 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 */
- };
- struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags);
- extern void 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, u32 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
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