Class: Innodb::FsegEntry

Inherits:
Object
  • Object
show all
Defined in:
lib/innodb/fseg_entry.rb

Overview

An InnoDB file segment entry, which appears in a few places, such as the FSEG header of INDEX pages, and in the TRX_SYS pages.

Constant Summary collapse

SIZE =

The size (in bytes) of an FSEG entry, which contains a two 32-bit integers and a 16-bit integer.

4 + 4 + 2

Class Method Summary collapse

Class Method Details

.get_entry_address(cursor) ⇒ Object

Return the FSEG entry address, which points to an entry on an INODE page.



10
11
12
13
14
15
16
17
18
 
# File 'lib/innodb/fseg_entry.rb', line 10

def self.get_entry_address(cursor)
  {
    :space_id     => cursor.name("space_id")    { cursor.get_uint32 },
    :page_number  => cursor.name("page_number") {
      Innodb::Page.maybe_undefined(cursor.get_uint32)
    },
    :offset       => cursor.name("offset")      { cursor.get_uint16 },
  }
end

.get_inode(space, cursor) ⇒ Object

Return an INODE entry which represents this file segment.



21
22
23
24
25
26
27
 
# File 'lib/innodb/fseg_entry.rb', line 21

def self.get_inode(space, cursor)
  address = cursor.name("address") { get_entry_address(cursor) }
  page = space.page(address[:page_number])
  if page.type == :INODE
    page.inode_at(page.cursor(address[:offset]))
  end
end