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114 lines
3.8 KiB
C
114 lines
3.8 KiB
C
/******************************************************
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Index page routines
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(c) 1994-1996 Innobase Oy
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Created 2/2/1994 Heikki Tuuri
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*******************************************************/
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#ifndef page0types_h
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#define page0types_h
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#include "univ.i"
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#include "dict0types.h"
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#include "mtr0types.h"
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/* Type of the index page */
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/* The following define eliminates a name collision on HP-UX */
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#define page_t ib_page_t
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typedef byte page_t;
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typedef struct page_search_struct page_search_t;
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typedef struct page_cur_struct page_cur_t;
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typedef byte page_zip_t;
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typedef struct page_zip_des_struct page_zip_des_t;
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/* The following definitions would better belong to page0zip.h,
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but we cannot include page0zip.h from rem0rec.ic, because
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page0*.h includes rem0rec.h and may include rem0rec.ic. */
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/* Compressed page descriptor */
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struct page_zip_des_struct
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{
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page_zip_t* data; /* compressed page data */
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ulint state:3; /* state of the control block
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(cf. enum buf_page_state) */
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ulint flush_type:2; /* if this block is currently being
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flushed to disk, this tells the
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flush_type (cf. enum buf_flush);
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protected by block->mutex */
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ulint :9; /* reserved */
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ulint n_blobs:12; /* number of externally stored
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columns on the page; the maximum
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is 744 on a 16 KiB page */
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ulint ssize:3; /* 0 or compressed page size;
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the size in bytes is 512<<ssize. */
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ulint m_start:16; /* start offset of modification log */
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ulint m_end:16; /* end offset of modification log */
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};
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#define PAGE_ZIP_MIN_SIZE 1024 /* smallest page_zip_des_struct.size */
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/**************************************************************************
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Write data to the compressed page. The data must already be written to
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the uncompressed page. */
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void
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page_zip_write(
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/*===========*/
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page_zip_des_t* page_zip,/* in/out: compressed page */
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const byte* rec, /* in: record whose data is being written */
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const ulint* offsets,/* in: rec_get_offsets(rec, index) */
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lint offset, /* in: start address of the block,
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relative to rec */
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ulint length) /* in: length of the data */
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__attribute__((nonnull));
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/**************************************************************************
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Write the "deleted" flag of a record on a compressed page. The flag must
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already have been written on the uncompressed page. */
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void
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page_zip_rec_set_deleted(
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/*=====================*/
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page_zip_des_t* page_zip,/* in/out: compressed page */
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const byte* rec, /* in: record on the uncompressed page */
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ulint flag) /* in: the deleted flag (nonzero=TRUE) */
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__attribute__((nonnull));
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/**************************************************************************
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Write the "owned" flag of a record on a compressed page. The n_owned field
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must already have been written on the uncompressed page. */
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void
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page_zip_rec_set_owned(
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/*===================*/
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page_zip_des_t* page_zip,/* in/out: compressed page */
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const byte* rec, /* in: record on the uncompressed page */
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ulint flag) /* in: the owned flag (nonzero=TRUE) */
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__attribute__((nonnull));
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/**************************************************************************
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Shift the dense page directory when a record is deleted. */
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void
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page_zip_dir_delete(
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/*================*/
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page_zip_des_t* page_zip,/* in/out: compressed page */
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byte* rec, /* in: deleted record */
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dict_index_t* index, /* in: index of rec */
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const ulint* offsets,/* in: rec_get_offsets(rec) */
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const byte* free) /* in: previous start of the free list */
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__attribute__((nonnull(1,2,3,4)));
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/**************************************************************************
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Add a slot to the dense page directory. */
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void
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page_zip_dir_add_slot(
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/*==================*/
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page_zip_des_t* page_zip, /* in/out: compressed page */
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ulint is_clustered) /* in: nonzero for clustered index,
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zero for others */
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__attribute__((nonnull));
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#endif
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