73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __FS_CEPH_PAGELIST_H
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#define __FS_CEPH_PAGELIST_H
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#include <asm/byteorder.h>
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#include <linux/refcount.h>
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#include <linux/list.h>
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#include <linux/types.h>
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struct ceph_pagelist {
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struct list_head head;
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void *mapped_tail;
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size_t length;
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size_t room;
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struct list_head free_list;
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size_t num_pages_free;
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refcount_t refcnt;
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};
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struct ceph_pagelist_cursor {
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struct ceph_pagelist *pl; /* pagelist, for error checking */
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struct list_head *page_lru; /* page in list */
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size_t room; /* room remaining to reset to */
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};
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struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags);
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extern void ceph_pagelist_release(struct ceph_pagelist *pl);
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extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
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extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
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extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
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extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
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struct ceph_pagelist_cursor *c);
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extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
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struct ceph_pagelist_cursor *c);
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static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)
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{
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__le64 ev = cpu_to_le64(v);
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return ceph_pagelist_append(pl, &ev, sizeof(ev));
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}
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static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v)
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{
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__le32 ev = cpu_to_le32(v);
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return ceph_pagelist_append(pl, &ev, sizeof(ev));
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}
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static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v)
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{
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__le16 ev = cpu_to_le16(v);
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return ceph_pagelist_append(pl, &ev, sizeof(ev));
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}
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static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
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{
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return ceph_pagelist_append(pl, &v, 1);
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}
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static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl,
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char *s, u32 len)
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{
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int ret = ceph_pagelist_encode_32(pl, len);
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if (ret)
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return ret;
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if (len)
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return ceph_pagelist_append(pl, s, len);
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return 0;
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}
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#endif
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