dm-vdo/indexer/geometry.c

23  * 16-byte metadata) and that open chapter index hash slots are one byte long. The four parameters
24  * are the number of bytes in a page, the number of record pages in a chapter, the number of
34  * per 32 KB page, 1024 chapters per volume, and either 64, 128, or 192 record pages per chapter
35  * (resulting in 6, 13, or 20 index pages per chapter) depending on the memory configuration. For
40  * index records per 32 KB page, 256 record pages per chapter, 26 index pages per chapter, and 1024
50  * per volume will have been reduced by one by eliminating physical chapter 0, and the virtual
51  * chapter that formerly mapped to physical chapter 0 may be remapped to another physical chapter.
52  * This remapping is expressed by storing which virtual chapter was remapped, and which physical
53  * chapter it was moved to.
83 	 * We want 1 delta list for every 64 records in the chapter.  in uds_make_index_geometry()
150 	/* This chapter is so old the answer doesn't matter. */  in uds_map_to_physical_chapter()
173 /* Calculate how many chapters to expire after opening the newest chapter. */
180 	/* If a chapter is out of order... */  in uds_chapters_to_expire()
185 		 * ... expire an extra chapter when expiring the moved chapter to free physical  in uds_chapters_to_expire()
186 		 * space for the new chapter ...  in uds_chapters_to_expire()
192 		 * ... but don't expire anything when the new chapter will use the physical chapter  in uds_chapters_to_expire()
193 		 * freed by expiring the moved chapter.  in uds_chapters_to_expire()