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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
rf_pass_through_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;
}
/****************************************************************//**
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 */
int64_t* read_batch_start, /*!<out: starting read
offset in bytes for the
next batch of pages */
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 > (int64_t)ctxt->buffer_capacity) {
*read_batch_len = ctxt->buffer_capacity;
}
ctxt->offset += *read_batch_len;
}
/* The pass-through read filter */
xb_read_filt_t rf_pass_through = {
&rf_pass_through_init,
&rf_pass_through_get_next_batch,
};
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