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The ceph_pagelist is a simple list of whole pages, strung together via their lru list_head. It facilitates encoding to a "buffer" of unknown size. Allow its use in place of the ceph_msg page vector. This will be used to fix the huge buffer preallocation woes of MDS reconnection. Signed-off-by: Sage Weil <sage@newdream.net>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
#ifndef __FS_CEPH_PAGELIST_H
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#define __FS_CEPH_PAGELIST_H
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#include <linux/list.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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};
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static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
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{
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INIT_LIST_HEAD(&pl->head);
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pl->mapped_tail = NULL;
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pl->length = 0;
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pl->room = 0;
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}
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extern int ceph_pagelist_release(struct ceph_pagelist *pl);
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extern int ceph_pagelist_append(struct ceph_pagelist *pl, void *d, size_t l);
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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, size_t 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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