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.



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# File 'lib/innodb/fseg_entry.rb', line 9

def self.get_entry_address(cursor)
  {
    :space_id     => cursor.get_uint32,
    :page_number  => cursor.get_uint32,
    :offset       => cursor.get_uint16,
  }
end

.get_inode(space, cursor) ⇒ Object

Return an INODE entry which represents this file segment.



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# File 'lib/innodb/fseg_entry.rb', line 18

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