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/******************************************************
XtraBackup: hot backup tool for InnoDB
(c) 2009-2012 Percona Inc.
Originally Created 3/3/2009 Yasufumi Kinoshita
Written by Alexey Kopytov, Aleksandr Kuzminsky, Stewart Smith, Vadim Tkachenko,
Yasufumi Kinoshita, Ignacio Nin and Baron Schwartz.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*******************************************************/
/* Data file read filter implementation */
#include "read_filt.h"
#include "common.h"
#include "fil_cur.h"
#include "xtrabackup.h"
/****************************************************************//**
Perform read filter context initialization that is common to all read
filters. */
static
void
common_init(
/*========*/
xb_read_filt_ctxt_t* ctxt, /*!<in/out: read filter context */
const xb_fil_cur_t* cursor) /*!<in: file cursor */
{
ctxt->offset = 0;
ctxt->data_file_size = cursor->statinfo.st_size;
ctxt->buffer_capacity = cursor->buf_size;
ctxt->page_size = cursor->page_size;
}
/****************************************************************//**
Initialize the pass-through read filter. */
static
void
rf_pass_through_init(
/*=================*/
xb_read_filt_ctxt_t* ctxt, /*!<in/out: read filter context */
const xb_fil_cur_t* cursor, /*!<in: file cursor */
ulint space_id __attribute__((unused)))
/*!<in: space id we are reading */
{
common_init(ctxt, cursor);
}
/****************************************************************//**
Get the next batch of pages for the pass-through read filter. */
static
void
rf_pass_through_get_next_batch(
/*===========================*/
xb_read_filt_ctxt_t* ctxt, /*!<in/out: read filter
context */
ib_int64_t* read_batch_start, /*!<out: starting read
offset in bytes for the
next batch of pages */
ib_int64_t* read_batch_len) /*!<out: length in
bytes of the next batch
of pages */
{
*read_batch_start = ctxt->offset;
*read_batch_len = ctxt->data_file_size - ctxt->offset;
if (*read_batch_len > (ib_int64_t)ctxt->buffer_capacity) {
*read_batch_len = ctxt->buffer_capacity;
}
ctxt->offset += *read_batch_len;
}
/****************************************************************//**
Deinitialize the pass-through read filter. */
static
void
rf_pass_through_deinit(
/*===================*/
xb_read_filt_ctxt_t* ctxt __attribute__((unused)))
/*!<in: read filter context */
{
}
/****************************************************************//**
Initialize the changed page bitmap-based read filter. Assumes that
the bitmap is already set up in changed_page_bitmap. */
static
void
rf_bitmap_init(
/*===========*/
xb_read_filt_ctxt_t* ctxt, /*!<in/out: read filter
context */
const xb_fil_cur_t* cursor, /*!<in: read cursor */
ulint space_id) /*!<in: space id */
{
common_init(ctxt, cursor);
ctxt->bitmap_range = xb_page_bitmap_range_init(changed_page_bitmap,
space_id);
ctxt->filter_batch_end = 0;
}
/****************************************************************//**
Get the next batch of pages for the bitmap read filter. */
static
void
rf_bitmap_get_next_batch(
/*=====================*/
xb_read_filt_ctxt_t* ctxt, /*!<in/out: read filter
context */
ib_int64_t* read_batch_start, /*!<out: starting read
offset in bytes for the
next batch of pages */
ib_int64_t* read_batch_len) /*!<out: length in
bytes of the next batch
of pages */
{
ulint start_page_id;
const ulint page_size = ctxt->page_size;
start_page_id = (ulint)(ctxt->offset / page_size);
xb_a (ctxt->offset % page_size == 0);
if (start_page_id == ctxt->filter_batch_end) {
/* Used up all the previous bitmap range, get some more */
ulint next_page_id;
/* Find the next changed page using the bitmap */
next_page_id = xb_page_bitmap_range_get_next_bit
(ctxt->bitmap_range, TRUE);
if (next_page_id == ULINT_UNDEFINED) {
*read_batch_len = 0;
return;
}
ctxt->offset = next_page_id * page_size;
/* Find the end of the current changed page block by searching
for the next cleared bitmap bit */
ctxt->filter_batch_end
= xb_page_bitmap_range_get_next_bit(ctxt->bitmap_range,
FALSE);
xb_a(next_page_id < ctxt->filter_batch_end);
}
*read_batch_start = ctxt->offset;
if (ctxt->filter_batch_end == ULINT_UNDEFINED) {
/* No more cleared bits in the bitmap, need to copy all the
remaining pages. */
*read_batch_len = ctxt->data_file_size - ctxt->offset;
} else {
*read_batch_len = ctxt->filter_batch_end * page_size
- ctxt->offset;
}
/* If the page block is larger than the buffer capacity, limit it to
buffer capacity. The subsequent invocations will continue returning
the current block in buffer-sized pieces until ctxt->filter_batch_end
is reached, trigerring the next bitmap query. */
if (*read_batch_len > (ib_int64_t)ctxt->buffer_capacity) {
*read_batch_len = ctxt->buffer_capacity;
}
ctxt->offset += *read_batch_len;
xb_a (ctxt->offset % page_size == 0);
xb_a (*read_batch_start % page_size == 0);
xb_a (*read_batch_len % page_size == 0);
}
/****************************************************************//**
Deinitialize the changed page bitmap-based read filter. */
static
void
rf_bitmap_deinit(
/*=============*/
xb_read_filt_ctxt_t* ctxt) /*!<in/out: read filter context */
{
xb_page_bitmap_range_deinit(ctxt->bitmap_range);
}
/* The pass-through read filter */
xb_read_filt_t rf_pass_through = {
&rf_pass_through_init,
&rf_pass_through_get_next_batch,
&rf_pass_through_deinit
};
/* The changed page bitmap-based read filter */
xb_read_filt_t rf_bitmap = {
&rf_bitmap_init,
&rf_bitmap_get_next_batch,
&rf_bitmap_deinit
};
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