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/******************************************************
MariaBackup: hot backup tool for InnoDB
(c) 2009-2013 Percona LLC and/or its affiliates.
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
*******************************************************/
/* Page write filters implementation */
#include <my_global.h>
#include <my_base.h>
#include "common.h"
#include "write_filt.h"
#include "fil_cur.h"
#include "xtrabackup.h"
/************************************************************************
Write-through page write filter. */
static my_bool wf_wt_init(xb_write_filt_ctxt_t *ctxt, char *dst_name,
xb_fil_cur_t *cursor, CorruptedPages *corrupted_pages);
static my_bool wf_wt_process(xb_write_filt_ctxt_t *ctxt, ds_file_t *dstfile);
xb_write_filt_t wf_write_through = {
&wf_wt_init,
&wf_wt_process,
NULL,
NULL
};
/************************************************************************
Incremental page write filter. */
static my_bool wf_incremental_init(xb_write_filt_ctxt_t *ctxt, char *dst_name,
xb_fil_cur_t *cursor, CorruptedPages *corrupted_pages);
static my_bool wf_incremental_process(xb_write_filt_ctxt_t *ctxt,
ds_file_t *dstfile);
static my_bool wf_incremental_finalize(xb_write_filt_ctxt_t *ctxt,
ds_file_t *dstfile);
static void wf_incremental_deinit(xb_write_filt_ctxt_t *ctxt);
xb_write_filt_t wf_incremental = {
&wf_incremental_init,
&wf_incremental_process,
&wf_incremental_finalize,
&wf_incremental_deinit
};
/************************************************************************
Initialize incremental page write filter.
@return TRUE on success, FALSE on error. */
static my_bool
wf_incremental_init(xb_write_filt_ctxt_t *ctxt, char *dst_name,
xb_fil_cur_t *cursor, CorruptedPages *corrupted_pages)
{
char meta_name[FN_REFLEN];
xb_wf_incremental_ctxt_t *cp =
&(ctxt->wf_incremental_ctxt);
ctxt->cursor = cursor;
/* allocate buffer for incremental backup (4096 pages) */
cp->delta_buf_size = (cursor->page_size / 4) * cursor->page_size;
cp->delta_buf = (unsigned char *)my_large_malloc(&cp->delta_buf_size, MYF(0));
if (!cp->delta_buf) {
msg(cursor->thread_n,"Can't allocate %zu bytes",
(size_t) cp->delta_buf_size);
return (FALSE);
}
/* write delta meta info */
snprintf(meta_name, sizeof(meta_name), "%s%s", dst_name,
XB_DELTA_INFO_SUFFIX);
const xb_delta_info_t info(cursor->page_size, cursor->zip_size,
cursor->space_id);
if (!xb_write_delta_metadata(meta_name, &info)) {
msg(cursor->thread_n,"Error: "
"failed to write meta info for %s",
cursor->rel_path);
return(FALSE);
}
/* change the target file name, since we are only going to write
delta pages */
strcat(dst_name, ".delta");
mach_write_to_4(cp->delta_buf, 0x78747261UL); /*"xtra"*/
cp->npages = 1;
cp->corrupted_pages = corrupted_pages;
return(TRUE);
}
/************************************************************************
Run the next batch of pages through incremental page write filter.
@return TRUE on success, FALSE on error. */
static my_bool
wf_incremental_process(xb_write_filt_ctxt_t *ctxt, ds_file_t *dstfile)
{
unsigned i;
xb_fil_cur_t *cursor = ctxt->cursor;
byte *page;
const ulint page_size = cursor->page_size;
xb_wf_incremental_ctxt_t *cp = &(ctxt->wf_incremental_ctxt);
for (i = 0, page = cursor->buf; i < cursor->buf_npages;
i++, page += page_size) {
if ((!cp->corrupted_pages ||
!cp->corrupted_pages->contains({cursor->node->space->id,
cursor->buf_page_no + i})) &&
incremental_lsn >= mach_read_from_8(page + FIL_PAGE_LSN))
continue;
/* Check whether TRX_SYS page has been changed */
if (mach_read_from_4(page + FIL_PAGE_SPACE_ID)
== TRX_SYS_SPACE
&& mach_read_from_4(page + FIL_PAGE_OFFSET)
== TRX_SYS_PAGE_NO) {
msg(cursor->thread_n,
"--incremental backup is impossible if "
"the server had been restarted with "
"different innodb_undo_tablespaces.");
return false;
}
/* updated page */
if (cp->npages == page_size / 4) {
/* flush buffer */
if (ds_write(dstfile, cp->delta_buf,
cp->npages * page_size)) {
return(FALSE);
}
/* clear buffer */
memset(cp->delta_buf, 0, page_size / 4 * page_size);
/*"xtra"*/
mach_write_to_4(cp->delta_buf, 0x78747261UL);
cp->npages = 1;
}
mach_write_to_4(cp->delta_buf + cp->npages * 4,
cursor->buf_page_no + i);
memcpy(cp->delta_buf + cp->npages * page_size, page,
page_size);
cp->npages++;
}
return(TRUE);
}
/************************************************************************
Flush the incremental page write filter's buffer.
@return TRUE on success, FALSE on error. */
static my_bool
wf_incremental_finalize(xb_write_filt_ctxt_t *ctxt, ds_file_t *dstfile)
{
xb_fil_cur_t *cursor = ctxt->cursor;
const ulint page_size = cursor->page_size;
xb_wf_incremental_ctxt_t *cp = &(ctxt->wf_incremental_ctxt);
if (cp->npages != page_size / 4) {
mach_write_to_4(cp->delta_buf + cp->npages * 4, 0xFFFFFFFFUL);
}
/* Mark the final block */
mach_write_to_4(cp->delta_buf, 0x58545241UL); /*"XTRA"*/
/* flush buffer */
if (ds_write(dstfile, cp->delta_buf, cp->npages * page_size)) {
return(FALSE);
}
return(TRUE);
}
/************************************************************************
Free the incremental page write filter's buffer. */
static void
wf_incremental_deinit(xb_write_filt_ctxt_t *ctxt)
{
xb_wf_incremental_ctxt_t *cp = &(ctxt->wf_incremental_ctxt);
my_large_free(cp->delta_buf, cp->delta_buf_size);
}
/************************************************************************
Initialize the write-through page write filter.
@return TRUE on success, FALSE on error. */
static my_bool
wf_wt_init(xb_write_filt_ctxt_t *ctxt, char *dst_name __attribute__((unused)),
xb_fil_cur_t *cursor, CorruptedPages *)
{
ctxt->cursor = cursor;
return(TRUE);
}
/************************************************************************
Write the next batch of pages to the destination datasink.
@return TRUE on success, FALSE on error. */
static my_bool
wf_wt_process(xb_write_filt_ctxt_t *ctxt, ds_file_t *dstfile)
{
xb_fil_cur_t *cursor = ctxt->cursor;
if (ds_write(dstfile, cursor->buf, cursor->buf_read)) {
return(FALSE);
}
return(TRUE);
}
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