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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef __FS_CEPH_PAGELIST_H3#define __FS_CEPH_PAGELIST_H4 5#include <asm/byteorder.h>6#include <linux/refcount.h>7#include <linux/list.h>8#include <linux/types.h>9 10struct ceph_pagelist {11 struct list_head head;12 void *mapped_tail;13 size_t length;14 size_t room;15 struct list_head free_list;16 size_t num_pages_free;17 refcount_t refcnt;18};19 20struct ceph_pagelist_cursor {21 struct ceph_pagelist *pl; /* pagelist, for error checking */22 struct list_head *page_lru; /* page in list */23 size_t room; /* room remaining to reset to */24};25 26struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags);27 28extern void ceph_pagelist_release(struct ceph_pagelist *pl);29 30extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);31 32extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);33 34extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);35 36extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,37 struct ceph_pagelist_cursor *c);38 39extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,40 struct ceph_pagelist_cursor *c);41 42static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)43{44 __le64 ev = cpu_to_le64(v);45 return ceph_pagelist_append(pl, &ev, sizeof(ev));46}47static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v)48{49 __le32 ev = cpu_to_le32(v);50 return ceph_pagelist_append(pl, &ev, sizeof(ev));51}52static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v)53{54 __le16 ev = cpu_to_le16(v);55 return ceph_pagelist_append(pl, &ev, sizeof(ev));56}57static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)58{59 return ceph_pagelist_append(pl, &v, 1);60}61static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl,62 char *s, u32 len)63{64 int ret = ceph_pagelist_encode_32(pl, len);65 if (ret)66 return ret;67 if (len)68 return ceph_pagelist_append(pl, s, len);69 return 0;70}71 72#endif73