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/* Copyright (C) 2018 MariaDB corporation
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 02111-1301 USA */
/* Code for doing backups of Aria tables */
#include "maria_def.h"
#include "ma_blockrec.h" /* PAGE_SUFFIX_SIZE */
#include "ma_checkpoint.h"
#include <aria_backup.h>
static uchar *_ma_base_info_read(uchar *ptr, MARIA_BASE_INFO *base);
/**
@brief Get capabilites for an Aria table
@param kfile key file (.MAI)
@param cap Capabilities are stored here
@return 0 ok
@return X errno
*/
int aria_get_capabilities(File kfile, ARIA_TABLE_CAPABILITIES *cap)
{
MARIA_SHARE share;
int error= 0;
uint head_length= sizeof(share.state.header), base_pos;
uint aligned_bit_blocks;
size_t info_length;
uchar *disc_cache;
DBUG_ENTER("aria_get_capabilities");
bzero(cap, sizeof(*cap));
if (my_pread(kfile,share.state.header.file_version, head_length, 0,
MYF(MY_NABP)))
DBUG_RETURN(HA_ERR_NOT_A_TABLE);
if (memcmp(share.state.header.file_version, maria_file_magic, 4))
DBUG_RETURN(HA_ERR_NOT_A_TABLE);
share.options= mi_uint2korr(share.state.header.options);
info_length= mi_uint2korr(share.state.header.header_length);
base_pos= mi_uint2korr(share.state.header.base_pos);
/*
Allocate space for header information and for data that is too
big to keep on stack
*/
if (!(disc_cache= my_malloc(info_length, MYF(MY_WME))))
DBUG_RETURN(ENOMEM);
if (my_pread(kfile, disc_cache, info_length, 0L, MYF(MY_NABP)))
{
error= my_errno;
goto err;
}
_ma_base_info_read(disc_cache + base_pos, &share.base);
cap->transactional= share.base.born_transactional;
cap->checksum= MY_TEST(share.options & HA_OPTION_PAGE_CHECKSUM);
cap->online_backup_safe= cap->transactional && cap->checksum;
cap->header_size= share.base.keystart;
cap->keypage_header= ((share.base.born_transactional ?
LSN_STORE_SIZE + TRANSID_SIZE :
0) + KEYPAGE_KEYID_SIZE + KEYPAGE_FLAG_SIZE +
KEYPAGE_USED_SIZE);
cap->block_size= share.base.block_size;
if (share.state.header.data_file_type == BLOCK_RECORD)
{
/* Calulate how man pages the row bitmap covers. From _ma_bitmap_init() */
aligned_bit_blocks= (cap->block_size - PAGE_SUFFIX_SIZE) / 6;
/*
In each 6 bytes, we have 6*8/3 = 16 pages covered
The +1 is to add the bitmap page, as this doesn't have to be covered
*/
cap->bitmap_pages_covered= aligned_bit_blocks * 16 + 1;
}
/* Do a check that that we got things right */
if (share.state.header.data_file_type != BLOCK_RECORD &&
cap->online_backup_safe)
error= HA_ERR_NOT_A_TABLE;
err:
my_free(disc_cache);
DBUG_RETURN(error);
} /* maria_get_capabilities */
/*
This is a copy of my_base_info_read from ma_open().
The base information will never change (something may be added
last, but not relevant for maria_get_capabilities), so it's safe to
copy it here.
The copy is done to avoid linking in the fill Aria library just
because maria_backup uses maria_get_capabilities()
*/
static uchar *_ma_base_info_read(uchar *ptr, MARIA_BASE_INFO *base)
{
bmove(base->uuid, ptr, MY_UUID_SIZE); ptr+= MY_UUID_SIZE;
base->keystart= mi_sizekorr(ptr); ptr+= 8;
base->max_data_file_length= mi_sizekorr(ptr); ptr+= 8;
base->max_key_file_length= mi_sizekorr(ptr); ptr+= 8;
base->records= (ha_rows) mi_sizekorr(ptr); ptr+= 8;
base->reloc= (ha_rows) mi_sizekorr(ptr); ptr+= 8;
base->mean_row_length= mi_uint4korr(ptr); ptr+= 4;
base->reclength= mi_uint4korr(ptr); ptr+= 4;
base->pack_reclength= mi_uint4korr(ptr); ptr+= 4;
base->min_pack_length= mi_uint4korr(ptr); ptr+= 4;
base->max_pack_length= mi_uint4korr(ptr); ptr+= 4;
base->min_block_length= mi_uint4korr(ptr); ptr+= 4;
base->fields= mi_uint2korr(ptr); ptr+= 2;
base->fixed_not_null_fields= mi_uint2korr(ptr); ptr+= 2;
base->fixed_not_null_fields_length= mi_uint2korr(ptr);ptr+= 2;
base->max_field_lengths= mi_uint2korr(ptr); ptr+= 2;
base->pack_fields= mi_uint2korr(ptr); ptr+= 2;
base->extra_options= mi_uint2korr(ptr); ptr+= 2;
base->null_bytes= mi_uint2korr(ptr); ptr+= 2;
base->original_null_bytes= mi_uint2korr(ptr); ptr+= 2;
base->field_offsets= mi_uint2korr(ptr); ptr+= 2;
base->language= mi_uint2korr(ptr); ptr+= 2;
base->block_size= mi_uint2korr(ptr); ptr+= 2;
base->rec_reflength= *ptr++;
base->key_reflength= *ptr++;
base->keys= *ptr++;
base->auto_key= *ptr++;
base->born_transactional= *ptr++;
ptr++;
base->pack_bytes= mi_uint2korr(ptr); ptr+= 2;
base->blobs= mi_uint2korr(ptr); ptr+= 2;
base->max_key_block_length= mi_uint2korr(ptr); ptr+= 2;
base->max_key_length= mi_uint2korr(ptr); ptr+= 2;
base->extra_alloc_bytes= mi_uint2korr(ptr); ptr+= 2;
base->extra_alloc_procent= *ptr++;
ptr+= 16;
return ptr;
}
/**
@brief Copy an index block with re-read if checksum doesn't match
@param dfile data file (.MAD)
@param cap aria capabilities from aria_get_capabilities
@param block block number to read (0, 1, 2, 3...)
@param buffer read data to this buffer
@param bytes_read number of bytes actually read (in case of end of file)
@return 0 ok
@return HA_ERR_END_OF_FILE ; End of file
@return # error number
*/
#define MAX_RETRY 10
int aria_read_index(File kfile, ARIA_TABLE_CAPABILITIES *cap, ulonglong block,
uchar *buffer)
{
MARIA_SHARE share;
int retry= 0;
DBUG_ENTER("aria_read_index");
share.keypage_header= cap->keypage_header;
share.block_size= cap->block_size;
do
{
int error;
size_t length;
if ((length= my_pread(kfile, buffer, cap->block_size,
block * cap->block_size, MYF(0))) != cap->block_size)
{
if (length == 0)
DBUG_RETURN(HA_ERR_END_OF_FILE);
if (length == (size_t) -1)
DBUG_RETURN(my_errno ? my_errno : -1);
/* Assume we got a half read; Do a re-read */
}
/* If not transactional or key file header, there are no checksums */
if (!cap->online_backup_safe ||
block < cap->header_size/ cap->block_size)
DBUG_RETURN(length == cap->block_size ? 0 : HA_ERR_CRASHED);
if (length == cap->block_size)
{
length= _ma_get_page_used(&share, buffer);
if (length > cap->block_size - CRC_SIZE)
DBUG_RETURN(HA_ERR_CRASHED);
error= maria_page_crc_check(buffer, block, &share,
MARIA_NO_CRC_NORMAL_PAGE,
(int) length);
if (error != HA_ERR_WRONG_CRC)
DBUG_RETURN(error);
}
my_sleep(100000); /* Sleep 0.1 seconds */
} while (retry < MAX_RETRY);
DBUG_RETURN(HA_ERR_WRONG_CRC);
}
/**
@brief Copy a data block with re-read if checksum doesn't match
@param dfile data file (.MAD)
@param cap aria capabilities from aria_get_capabilities
@param block block number to read (0, 1, 2, 3...)
@param buffer read data to this buffer
@param bytes_read number of bytes actually read (in case of end of file)
@return 0 ok
@return HA_ERR_END_OF_FILE ; End of file
@return # error number
*/
int aria_read_data(File dfile, ARIA_TABLE_CAPABILITIES *cap, ulonglong block,
uchar *buffer, size_t *bytes_read)
{
MARIA_SHARE share;
int retry= 0;
DBUG_ENTER("aria_read_data");
share.keypage_header= cap->keypage_header;
share.block_size= cap->block_size;
if (!cap->online_backup_safe)
{
*bytes_read= my_pread(dfile, buffer, cap->block_size,
block * cap->block_size, MY_WME);
if (*bytes_read == 0)
DBUG_RETURN(HA_ERR_END_OF_FILE);
DBUG_RETURN(*bytes_read > 0 ? 0 : (my_errno ? my_errno : -1));
}
*bytes_read= cap->block_size;
do
{
int error;
size_t length;
if ((length= my_pread(dfile, buffer, cap->block_size,
block * cap->block_size, MYF(0))) != cap->block_size)
{
if (length == 0)
DBUG_RETURN(HA_ERR_END_OF_FILE);
if (length == (size_t) -1)
DBUG_RETURN(my_errno ? my_errno : -1);
}
/* If not transactional or key file header, there are no checksums */
if (!cap->online_backup_safe)
DBUG_RETURN(length == cap->block_size ? 0 : HA_ERR_CRASHED);
if (length == cap->block_size)
{
error= maria_page_crc_check(buffer, block, &share,
((block % cap->bitmap_pages_covered) == 0 ?
MARIA_NO_CRC_BITMAP_PAGE :
MARIA_NO_CRC_NORMAL_PAGE),
share.block_size - CRC_SIZE);
if (error != HA_ERR_WRONG_CRC)
DBUG_RETURN(error);
}
my_sleep(100000); /* Sleep 0.1 seconds */
} while (retry < MAX_RETRY);
DBUG_RETURN(HA_ERR_WRONG_CRC);
}
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