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5837f75150
ut_is_2pow(): New function for testing if a number is zero or a power of two. Use this function instead of bitwise arithmetics or ut_2_power_up() where possible.
28 lines
756 B
Text
28 lines
756 B
Text
/******************************************************
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File space management
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(c) 1995 Innobase Oy
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Created 12/18/1995 Heikki Tuuri
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*******************************************************/
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/***************************************************************************
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Checks if a page address is an extent descriptor page address. */
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UNIV_INLINE
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ibool
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fsp_descr_page(
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/*===========*/
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/* out: TRUE if a descriptor page */
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ulint zip_size,/* in: compressed page size in bytes;
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0 for uncompressed pages */
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ulint page_no)/* in: page number */
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{
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ut_ad(ut_is_2pow(zip_size));
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if (!zip_size) {
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return(UNIV_UNLIKELY((page_no & (UNIV_PAGE_SIZE - 1))
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== FSP_XDES_OFFSET));
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}
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return(UNIV_UNLIKELY((page_no & (zip_size - 1)) == FSP_XDES_OFFSET));
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}
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