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Diffstat (limited to '')
| -rw-r--r-- | src/osdc/Striper.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/src/osdc/Striper.h b/src/osdc/Striper.h new file mode 100644 index 000000000..0761cd6c7 --- /dev/null +++ b/src/osdc/Striper.h @@ -0,0 +1,132 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab +/* + * Ceph - scalable distributed file system + * + * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net> + * + * This is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2.1, as published by the Free Software + * Foundation. See file COPYING. + * + */ + +#ifndef CEPH_STRIPER_H +#define CEPH_STRIPER_H + +#include "include/common_fwd.h" +#include "include/types.h" +#include "osd/osd_types.h" +#include "osdc/StriperTypes.h" + + +//namespace ceph { + + class Striper { + public: + static void file_to_extents( + CephContext *cct, const file_layout_t *layout, uint64_t offset, + uint64_t len, uint64_t trunc_size, uint64_t buffer_offset, + striper::LightweightObjectExtents* object_extents); + + /* + * std::map (ino, layout, offset, len) to a (list of) ObjectExtents (byte + * ranges in objects on (primary) osds) + */ + static void file_to_extents(CephContext *cct, const char *object_format, + const file_layout_t *layout, + uint64_t offset, uint64_t len, + uint64_t trunc_size, + std::map<object_t, std::vector<ObjectExtent> >& extents, + uint64_t buffer_offset=0); + + static void file_to_extents(CephContext *cct, const char *object_format, + const file_layout_t *layout, + uint64_t offset, uint64_t len, + uint64_t trunc_size, + std::vector<ObjectExtent>& extents, + uint64_t buffer_offset=0); + + static void file_to_extents(CephContext *cct, inodeno_t ino, + const file_layout_t *layout, + uint64_t offset, uint64_t len, + uint64_t trunc_size, + std::vector<ObjectExtent>& extents) { + // generate prefix/format + char buf[32]; + snprintf(buf, sizeof(buf), "%llx.%%08llx", (long long unsigned)ino); + + file_to_extents(cct, buf, layout, offset, len, trunc_size, extents); + } + + /** + * reverse std::map an object extent to file extents + */ + static void extent_to_file(CephContext *cct, file_layout_t *layout, + uint64_t objectno, uint64_t off, uint64_t len, + std::vector<std::pair<uint64_t, uint64_t> >& extents); + + static uint64_t object_truncate_size( + CephContext *cct, const file_layout_t *layout, + uint64_t objectno, uint64_t trunc_size); + + static uint64_t get_num_objects(const file_layout_t& layout, + uint64_t size); + + static uint64_t get_file_offset(CephContext *cct, + const file_layout_t *layout, uint64_t objectno, uint64_t off); + /* + * helper to assemble a striped result + */ + class StripedReadResult { + // offset -> (data, intended length) + std::map<uint64_t, std::pair<ceph::buffer::list, uint64_t> > partial; + uint64_t total_intended_len = 0; //sum of partial.second.second + + public: + void add_partial_result( + CephContext *cct, ceph::buffer::list& bl, + const std::vector<std::pair<uint64_t,uint64_t> >& buffer_extents); + void add_partial_result( + CephContext *cct, ceph::buffer::list&& bl, + const striper::LightweightBufferExtents& buffer_extents); + + /** + * add sparse read into results + * + * @param bl buffer + * @param bl_map std::map of which logical source extents this covers + * @param bl_off logical buffer offset (e.g., first bl_map key + * if the buffer is not sparse) + * @param buffer_extents output buffer extents the data maps to + */ + void add_partial_sparse_result( + CephContext *cct, ceph::buffer::list& bl, + const std::map<uint64_t, uint64_t>& bl_map, uint64_t bl_off, + const std::vector<std::pair<uint64_t,uint64_t> >& buffer_extents); + void add_partial_sparse_result( + CephContext *cct, ceph::buffer::list&& bl, + const std::vector<std::pair<uint64_t, uint64_t>>& bl_map, + uint64_t bl_off, + const striper::LightweightBufferExtents& buffer_extents); + + void assemble_result(CephContext *cct, ceph::buffer::list& bl, + bool zero_tail); + + /** + * @buffer copy read data into buffer + * @len the length of buffer + */ + void assemble_result(CephContext *cct, char *buffer, size_t len); + + uint64_t assemble_result(CephContext *cct, + std::map<uint64_t, uint64_t> *extent_map, + ceph::buffer::list *bl); + }; + + }; + +//}; + +#endif |