~drizzle-trunk/drizzle/development : contents of storage/myisam/mi

~drizzle-trunk/drizzle/development : (revision 72)

/* Copyright (C) 2000-2002, 2004-2006 MySQL AB

   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 cacheing */
  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);
  }
  /* my_errno should be set if rec_cache.error == -1 */
  if (info->rec_cache.error != -1 || my_errno == 0)
    my_errno=HA_ERR_WRONG_IN_RECORD;
  DBUG_RETURN(my_errno);			/* Something wrong (EOF?) */
}

1 by brian clean slate	1	/* Copyright (C) 2000-2002, 2004-2006 MySQL AB
	2
	3	This program is free software; you can redistribute it and/or modify
	4	it under the terms of the GNU General Public License as published by
	5	the Free Software Foundation; version 2 of the License.
	6
	7	This program is distributed in the hope that it will be useful,
	8	but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	GNU General Public License for more details.
	11
	12	You should have received a copy of the GNU General Public License
	13	along with this program; if not, write to the Free Software
	14	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
	15
	16	/* Functions to handle fixed-length-records */
	17
	18	#include "myisamdef.h"
	19
	20
	21	int _mi_write_static_record(MI_INFO info, const uchar record)
	22	{
	23	uchar temp[8]; /* max pointer length */
	24	if (info->s->state.dellink != HA_OFFSET_ERROR &&
	25	!info->append_insert_at_end)
	26	{
	27	my_off_t filepos=info->s->state.dellink;
	28	info->rec_cache.seek_not_done=1; /* We have done a seek */
	29	if (info->s->file_read(info, &temp[0],info->s->base.rec_reflength,
	30	info->s->state.dellink+1,
	31	MYF(MY_NABP)))
	32	goto err;
	33	info->s->state.dellink= _mi_rec_pos(info->s,temp);
	34	info->state->del--;
	35	info->state->empty-=info->s->base.pack_reclength;
	36	if (info->s->file_write(info, record, info->s->base.reclength,
	37	filepos,
	38	MYF(MY_NABP)))
	39	goto err;
	40	}
	41	else
	42	{
	43	if (info->state->data_file_length > info->s->base.max_data_file_length-
	44	info->s->base.pack_reclength)
	45	{
	46	my_errno=HA_ERR_RECORD_FILE_FULL;
	47	return(2);
	48	}
	49	if (info->opt_flag & WRITE_CACHE_USED)
	50	{ /* Cash in use */
	51	if (my_b_write(&info->rec_cache, record,
	52	info->s->base.reclength))
	53	goto err;
	54	if (info->s->base.pack_reclength != info->s->base.reclength)
	55	{
	56	uint length=info->s->base.pack_reclength - info->s->base.reclength;
	57	bzero(temp,length);
	58	if (my_b_write(&info->rec_cache, temp,length))
	59	goto err;
	60	}
	61	}
	62	else
	63	{
	64	info->rec_cache.seek_not_done=1; /* We have done a seek */
65	if (info->s->file_write(info, record, info->s->base.reclength,
66	info->state->data_file_length,
67	info->s->write_flag))
68	goto err;
69	if (info->s->base.pack_reclength != info->s->base.reclength)
70	{
71	uint length=info->s->base.pack_reclength - info->s->base.reclength;
72	bzero(temp,length);
73	if (info->s->file_write(info, temp,length,
74	info->state->data_file_length+
75	info->s->base.reclength,
76	info->s->write_flag))
77	goto err;
78	}
79	}
80	info->state->data_file_length+=info->s->base.pack_reclength;
81	info->s->state.split++;
82	}
83	return 0;
84	err:
85	return 1;
86	}
87
88	int _mi_update_static_record(MI_INFO info, my_off_t pos, const uchar record)
89	{
90	info->rec_cache.seek_not_done=1; /* We have done a seek */
91	return (info->s->file_write(info,
92	record, info->s->base.reclength,
93	pos,
94	MYF(MY_NABP)) != 0);
95	}
96
97
98	int _mi_delete_static_record(MI_INFO *info)
99	{
100	uchar temp[9]; /* 1+sizeof(uint32) */
101
102	info->state->del++;
103	info->state->empty+=info->s->base.pack_reclength;
104	temp[0]= '\0'; /* Mark that record is deleted */
105	_mi_dpointer(info,temp+1,info->s->state.dellink);
106	info->s->state.dellink = info->lastpos;
107	info->rec_cache.seek_not_done=1;
108	return (info->s->file_write(info,(uchar*) temp, 1+info->s->rec_reflength,
109	info->lastpos, MYF(MY_NABP)) != 0);
110	}
111
112
113	int _mi_cmp_static_record(register MI_INFO info, register const uchar old)
114	{
115	DBUG_ENTER("_mi_cmp_static_record");
116
117	if (info->opt_flag & WRITE_CACHE_USED)
118	{
119	if (flush_io_cache(&info->rec_cache))
120	{
121	DBUG_RETURN(-1);
122	}
123	info->rec_cache.seek_not_done=1; /* We have done a seek */
124	}
125
126	if ((info->opt_flag & READ_CHECK_USED))
127	{ /* If check isn't disabled */
128	info->rec_cache.seek_not_done=1; /* We have done a seek */
129	if (info->s->file_read(info, info->rec_buff, info->s->base.reclength,
130	info->lastpos,
131	MYF(MY_NABP)))
132	DBUG_RETURN(-1);
133	if (memcmp(info->rec_buff, old,
134	(uint) info->s->base.reclength))
135	{
136	DBUG_DUMP("read",old,info->s->base.reclength);
137	DBUG_DUMP("disk",info->rec_buff,info->s->base.reclength);
138	my_errno=HA_ERR_RECORD_CHANGED; /* Record have changed */
139	DBUG_RETURN(1);
140	}
141	}
142	DBUG_RETURN(0);
143	}
144
145
146	int _mi_cmp_static_unique(MI_INFO info, MI_UNIQUEDEF def,
147	const uchar *record, my_off_t pos)
148	{
149	DBUG_ENTER("_mi_cmp_static_unique");
150
151	info->rec_cache.seek_not_done=1; /* We have done a seek */
152	if (info->s->file_read(info, info->rec_buff, info->s->base.reclength,
153	pos, MYF(MY_NABP)))
154	DBUG_RETURN(-1);
155	DBUG_RETURN(mi_unique_comp(def, record, info->rec_buff,
156	def->null_are_equal));
157	}
158
159
160	/* Read a fixed-length-record */
161	/* Returns 0 if Ok. */
162	/* 1 if record is deleted */
163	/* MY_FILE_ERROR on read-error or locking-error */
164
165	int _mi_read_static_record(register MI_INFO *info, register my_off_t pos,
166	register uchar *record)
167	{
168	int error;
169
170	if (pos != HA_OFFSET_ERROR)
171	{
172	if (info->opt_flag & WRITE_CACHE_USED &&
173	info->rec_cache.pos_in_file <= pos &&
174	flush_io_cache(&info->rec_cache))
175	return(-1);
176	info->rec_cache.seek_not_done=1; /* We have done a seek */
177
178	error=info->s->file_read(info, record, info->s->base.reclength,
179	pos,MYF(MY_NABP)) != 0;
180	fast_mi_writeinfo(info);
181	if (! error)
182	{
183	if (!*record)
184	{
185	my_errno=HA_ERR_RECORD_DELETED;
186	return(1); /* Record is deleted */
187	}
188	info->update\|= HA_STATE_AKTIV; /* Record is read */
189	return(0);
190	}
191	return(-1); /* Error on read */
192	}
193	fast_mi_writeinfo(info); /* No such record */
194	return(-1);
195	}
196
197
198
199	int _mi_read_rnd_static_record(MI_INFO info, uchar buf,
200	register my_off_t filepos,
201	my_bool skip_deleted_blocks)
202	{
203	int locked,error,cache_read;
204	uint cache_length;
205	MYISAM_SHARE *share=info->s;
206	DBUG_ENTER("_mi_read_rnd_static_record");
207
208	cache_read=0;
209	cache_length=0;
210	if (info->opt_flag & WRITE_CACHE_USED &&
211	(info->rec_cache.pos_in_file <= filepos \|\| skip_deleted_blocks) &&
212	flush_io_cache(&info->rec_cache))
213	DBUG_RETURN(my_errno);
214	if (info->opt_flag & READ_CACHE_USED)
215	{ /* Cache in use */
216	if (filepos == my_b_tell(&info->rec_cache) &&
217	(skip_deleted_blocks \|\| !filepos))
218	{
219	cache_read=1; /* Read record using cache */
220	cache_length=(uint) (info->rec_cache.read_end - info->rec_cache.read_pos);
221	}
222	else
223	info->rec_cache.seek_not_done=1; /* Filepos is changed */
224	}
225	locked=0;
226	if (info->lock_type == F_UNLCK)
227	{
228	if (filepos >= info->state->data_file_length)
229	{ /* Test if new records */
230	if (_mi_readinfo(info,F_RDLCK,0))
231	DBUG_RETURN(my_errno);
232	locked=1;
233	}
234	else
235	{ /* We don't nead new info */
236	#ifndef UNSAFE_LOCKING
237	if ((! cache_read \|\| share->base.reclength > cache_length) &&
238	share->tot_locks == 0)
239	{ /* record not in cache */
240	if (my_lock(share->kfile,F_RDLCK,0L,F_TO_EOF,
241	MYF(MY_SEEK_NOT_DONE) \| info->lock_wait))
242	DBUG_RETURN(my_errno);
243	locked=1;
244	}
245	#else
246	info->tmp_lock_type=F_RDLCK;
247	#endif
248	}
249	}
250	if (filepos >= info->state->data_file_length)
251	{
252	DBUG_PRINT("test",("filepos: %ld (%ld) records: %ld del: %ld",
253	(long) filepos/share->base.reclength, (long) filepos,
254	(long) info->state->records, (long) info->state->del));
255	fast_mi_writeinfo(info);
256	DBUG_RETURN(my_errno=HA_ERR_END_OF_FILE);
257	}
258	info->lastpos= filepos;
259	info->nextpos= filepos+share->base.pack_reclength;
260
261	if (! cache_read) /* No cacheing */
262	{
263	if ((error=_mi_read_static_record(info,filepos,buf)))
264	{
265	if (error > 0)
266	error=my_errno=HA_ERR_RECORD_DELETED;
267	else
268	error=my_errno;
269	}
270	DBUG_RETURN(error);
271	}
272
273	/* Read record with cacheing */
274	error=my_b_read(&info->rec_cache,(uchar*) buf,share->base.reclength);
275	if (info->s->base.pack_reclength != info->s->base.reclength && !error)
276	{
277	char tmp[8]; /* Skill fill bytes */
278	error=my_b_read(&info->rec_cache,(uchar*) tmp,
279	info->s->base.pack_reclength - info->s->base.reclength);
280	}
281	if (locked)
282	VOID(_mi_writeinfo(info,0)); /* Unlock keyfile */
283	if (!error)
284	{
285	if (!buf[0])
286	{ /* Record is removed */
287	DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED);
288	}
289	/* Found and may be updated */
290	info->update\|= HA_STATE_AKTIV \| HA_STATE_KEY_CHANGED;
291	DBUG_RETURN(0);
292	}
293	/* my_errno should be set if rec_cache.error == -1 */
294	if (info->rec_cache.error != -1 \|\| my_errno == 0)
295	my_errno=HA_ERR_WRONG_IN_RECORD;
296	DBUG_RETURN(my_errno); /* Something wrong (EOF?) */
297	}