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Improve the documentation of FIL_PAGE_PREV, FIL_PAGE_NEXT,

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and REC_INFO_MIN_REC_FLAG.
This commit is contained in:
marko 2006-05-11 12:44:01 +00:00
parent c3908a7fc6
commit 0c532d7567
2 changed files with 18 additions and 4 deletions
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16
include/fil0fil.h
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@ -57,9 +57,21 @@ extern fil_addr_t fil_addr_null;
page */
#define FIL_PAGE_OFFSET 4 /* page offset inside space */
#define FIL_PAGE_PREV 8 /* if there is a 'natural' predecessor
of the page, its offset */
of the page, its offset.
Otherwise FIL_NULL.
This field is not set on BLOB pages,
which are stored as a singly-linked
list. See also FIL_PAGE_NEXT. */
#define FIL_PAGE_NEXT 12 /* if there is a 'natural' successor
of the page, its offset */
of the page, its offset.
Otherwise FIL_NULL.
B-tree index pages
(FIL_PAGE_TYPE contains FIL_PAGE_INDEX)
on the same PAGE_LEVEL are maintained
as a doubly linked list via
FIL_PAGE_PREV and FIL_PAGE_NEXT
in the collation order of the
smallest user record on each page. */
#define FIL_PAGE_LSN 16 /* lsn of the end of the newest
modification log record to the page */
#define FIL_PAGE_TYPE 24 /* file page type: FIL_PAGE_INDEX,...,

6
include/rem0rec.h
View file

@ -19,8 +19,10 @@ Created 5/30/1994 Heikki Tuuri
#define REC_MAX_HEAP_NO (2 * 8192 - 1)
#define REC_MAX_N_OWNED (16 - 1)
/* Flag denoting the predefined minimum record: this bit is ORed in the 4
info bits of a record */
/* Info bit denoting the predefined minimum record: this bit is set
if and only if the record is the first user record on a non-leaf
B-tree page that is the leftmost page on its level
(PAGE_LEVEL is nonzero and FIL_PAGE_PREV is FIL_NULL). */
#define REC_INFO_MIN_REC_FLAG 0x10UL
/* Number of extra bytes in an old-style record,