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/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
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 St, Fifth Floor, Boston, MA 02110-1335 USA */
/* Functions to handle fixed-length-records */
#include "myisamdef.h"
int _mi_write_static_record(MI_INFO *info, const uchar *record)
{
uchar temp[8]; /* max pointer length */
if (info->s->state.dellink != HA_OFFSET_ERROR &&
!info->append_insert_at_end)
{
my_off_t filepos=info->s->state.dellink;
info->rec_cache.seek_not_done=1; /* We have done a seek */
if (info->s->file_read(info, &temp[0],info->s->base.rec_reflength,
info->s->state.dellink+1,
MYF(MY_NABP)))
goto err;
info->s->state.dellink= _mi_rec_pos(info->s,temp);
info->state->del--;
info->state->empty-=info->s->base.pack_reclength;
if (info->s->file_write(info, record, info->s->base.reclength,
filepos,
MYF(MY_NABP)))
goto err;
}
else
{
if (info->state->data_file_length > info->s->base.max_data_file_length-
info->s->base.pack_reclength)
{
my_errno=HA_ERR_RECORD_FILE_FULL;
return(2);
}
if (info->opt_flag & WRITE_CACHE_USED)
{ /* Cash in use */
if (my_b_write(&info->rec_cache, record,
info->s->base.reclength))
goto err;
if (info->s->base.pack_reclength != info->s->base.reclength)
{
uint length=info->s->base.pack_reclength - info->s->base.reclength;
bzero(temp,length);
if (my_b_write(&info->rec_cache, temp,length))
goto err;
}
}
else
{
info->rec_cache.seek_not_done=1; /* We have done a seek */
if (info->s->file_write(info, record, info->s->base.reclength,
info->state->data_file_length,
info->s->write_flag))
goto err;
if (info->s->base.pack_reclength != info->s->base.reclength)
{
uint length=info->s->base.pack_reclength - info->s->base.reclength;
bzero(temp,length);
if (info->s->file_write(info, temp,length,
info->state->data_file_length+
info->s->base.reclength,
info->s->write_flag))
goto err;
}
}
info->state->data_file_length+=info->s->base.pack_reclength;
info->s->state.split++;
}
return 0;
err:
return 1;
}
int _mi_update_static_record(MI_INFO *info, my_off_t pos, const uchar *record)
{
info->rec_cache.seek_not_done=1; /* We have done a seek */
return (info->s->file_write(info,
record, info->s->base.reclength,
pos,
MYF(MY_NABP)) != 0);
}
int _mi_delete_static_record(MI_INFO *info)
{
uchar temp[9]; /* 1+sizeof(uint32) */
info->state->del++;
info->state->empty+=info->s->base.pack_reclength;
temp[0]= '\0'; /* Mark that record is deleted */
_mi_dpointer(info,temp+1,info->s->state.dellink);
info->s->state.dellink = info->lastpos;
info->rec_cache.seek_not_done=1;
return (info->s->file_write(info,(uchar*) temp, 1+info->s->rec_reflength,
info->lastpos, MYF(MY_NABP)) != 0);
}
int _mi_cmp_static_record(register MI_INFO *info, register const uchar *old)
{
DBUG_ENTER("_mi_cmp_static_record");
if (info->opt_flag & WRITE_CACHE_USED)
{
if (flush_io_cache(&info->rec_cache))
{
DBUG_RETURN(-1);
}
info->rec_cache.seek_not_done=1; /* We have done a seek */
}
if ((info->opt_flag & READ_CHECK_USED))
{ /* If check isn't disabled */
info->rec_cache.seek_not_done=1; /* We have done a seek */
if (info->s->file_read(info, info->rec_buff, info->s->base.reclength,
info->lastpos,
MYF(MY_NABP)))
DBUG_RETURN(-1);
if (memcmp(info->rec_buff, old,
(uint) info->s->base.reclength))
{
DBUG_DUMP("read",old,info->s->base.reclength);
DBUG_DUMP("disk",info->rec_buff,info->s->base.reclength);
my_errno=HA_ERR_RECORD_CHANGED; /* Record have changed */
DBUG_RETURN(1);
}
}
DBUG_RETURN(0);
}
int _mi_cmp_static_unique(MI_INFO *info, MI_UNIQUEDEF *def,
const uchar *record, my_off_t pos)
{
DBUG_ENTER("_mi_cmp_static_unique");
info->rec_cache.seek_not_done=1; /* We have done a seek */
if (info->s->file_read(info, info->rec_buff, info->s->base.reclength,
pos, MYF(MY_NABP)))
DBUG_RETURN(-1);
DBUG_RETURN(mi_unique_comp(def, record, info->rec_buff,
def->null_are_equal));
}
/* Read a fixed-length-record */
/* Returns 0 if Ok. */
/* 1 if record is deleted */
/* MY_FILE_ERROR on read-error or locking-error */
int _mi_read_static_record(register MI_INFO *info, register my_off_t pos,
register uchar *record)
{
int error;
if (pos != HA_OFFSET_ERROR)
{
if (info->opt_flag & WRITE_CACHE_USED &&
info->rec_cache.pos_in_file <= pos &&
flush_io_cache(&info->rec_cache))
return(-1);
info->rec_cache.seek_not_done=1; /* We have done a seek */
error=info->s->file_read(info, record, info->s->base.reclength,
pos,MYF(MY_NABP)) != 0;
fast_mi_writeinfo(info);
if (! error)
{
if (!*record)
{
my_errno=HA_ERR_RECORD_DELETED;
return(1); /* Record is deleted */
}
info->update|= HA_STATE_AKTIV; /* Record is read */
return(0);
}
return(-1); /* Error on read */
}
fast_mi_writeinfo(info); /* No such record */
return(-1);
}
int _mi_read_rnd_static_record(MI_INFO *info, uchar *buf,
register my_off_t filepos,
my_bool skip_deleted_blocks)
{
int locked,error,cache_read;
uint cache_length;
MYISAM_SHARE *share=info->s;
DBUG_ENTER("_mi_read_rnd_static_record");
cache_read=0;
cache_length=0;
if (info->opt_flag & WRITE_CACHE_USED &&
(info->rec_cache.pos_in_file <= filepos || skip_deleted_blocks) &&
flush_io_cache(&info->rec_cache))
DBUG_RETURN(my_errno);
if (info->opt_flag & READ_CACHE_USED)
{ /* Cache in use */
if (filepos == my_b_tell(&info->rec_cache) &&
(skip_deleted_blocks || !filepos))
{
cache_read=1; /* Read record using cache */
cache_length=(uint) (info->rec_cache.read_end - info->rec_cache.read_pos);
}
else
info->rec_cache.seek_not_done=1; /* Filepos is changed */
}
locked=0;
if (info->lock_type == F_UNLCK)
{
if (filepos >= info->state->data_file_length)
{ /* Test if new records */
if (_mi_readinfo(info,F_RDLCK,0))
DBUG_RETURN(my_errno);
locked=1;
}
else
{ /* We don't nead new info */
#ifndef UNSAFE_LOCKING
if ((! cache_read || share->base.reclength > cache_length) &&
share->tot_locks == 0)
{ /* record not in cache */
if (my_lock(share->kfile,F_RDLCK,0L,F_TO_EOF,
MYF(MY_SEEK_NOT_DONE) | info->lock_wait))
DBUG_RETURN(my_errno);
locked=1;
}
#else
info->tmp_lock_type=F_RDLCK;
#endif
}
}
if (filepos >= info->state->data_file_length)
{
DBUG_PRINT("test",("filepos: %ld (%ld) records: %ld del: %ld",
(long) filepos/share->base.reclength, (long) filepos,
(long) info->state->records, (long) info->state->del));
fast_mi_writeinfo(info);
DBUG_RETURN(my_errno=HA_ERR_END_OF_FILE);
}
info->lastpos= filepos;
info->nextpos= filepos+share->base.pack_reclength;
if (! cache_read) /* No cacheing */
{
if ((error=_mi_read_static_record(info,filepos,buf)))
{
if (error > 0)
error=my_errno=HA_ERR_RECORD_DELETED;
else
error=my_errno;
}
DBUG_RETURN(error);
}
/*
Read record with caching. If my_b_read() returns TRUE, less than the
requested bytes have been read. In this case rec_cache.error is
either -1 for a read error, or contains the number of bytes copied
into the buffer.
*/
error=my_b_read(&info->rec_cache,(uchar*) buf,share->base.reclength);
if (info->s->base.pack_reclength != info->s->base.reclength && !error)
{
char tmp[8]; /* Skill fill bytes */
error=my_b_read(&info->rec_cache,(uchar*) tmp,
info->s->base.pack_reclength - info->s->base.reclength);
}
if (locked)
(void) _mi_writeinfo(info,0); /* Unlock keyfile */
if (!error)
{
if (!buf[0])
{ /* Record is removed */
DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED);
}
/* Found and may be updated */
info->update|= HA_STATE_AKTIV | HA_STATE_KEY_CHANGED;
DBUG_RETURN(0);
}
/* error is TRUE. my_errno should be set if rec_cache.error == -1 */
if (info->rec_cache.error != -1 || my_errno == 0)
{
/*
If we could not get a full record, we either have a broken record,
or are at end of file.
*/
if (info->rec_cache.error == 0)
my_errno= HA_ERR_END_OF_FILE;
else
my_errno= HA_ERR_WRONG_IN_RECORD;
}
DBUG_RETURN(my_errno); /* Something wrong (EOF?) */
}
|
