68b4476b0b
Allow the messenger to send/receive data in a bio. This is added so that we wouldn't need to copy the data into pages or some other buffer when doing IO for an rbd block device. We can now have trailing variable sized data for osd ops. Also osd ops encoding is more modular. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> 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, const 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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