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72 lines
1.9 KiB
72 lines
1.9 KiB
/* 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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