diff options
Diffstat (limited to 'storage/innobase/include/fil0fil.h')
| -rw-r--r-- | storage/innobase/include/fil0fil.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/storage/innobase/include/fil0fil.h b/storage/innobase/include/fil0fil.h index 53bb496c190..6b8fd4b03d5 100644 --- a/storage/innobase/include/fil0fil.h +++ b/storage/innobase/include/fil0fil.h @@ -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,..., |