1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
/* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/* Functions to handle fixed-length-records */
#include "myisam_priv.h"
using namespace drizzled;
int _mi_write_static_record(MI_INFO *info, const unsigned char *record)
{
unsigned char temp[8]; /* max pointer length */
if (info->s->state.dellink != HA_OFFSET_ERROR &&
!info->append_insert_at_end)
{
internal::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)
{
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)
{
uint32_t length=info->s->base.pack_reclength - info->s->base.reclength;
memset(temp, 0, 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)
{
uint32_t length=info->s->base.pack_reclength - info->s->base.reclength;
memset(temp, 0, 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, internal::my_off_t pos, const unsigned char *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)
{
unsigned char 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,(unsigned char*) temp, 1+info->s->rec_reflength,
info->lastpos, MYF(MY_NABP)) != 0);
}
int _mi_cmp_static_record(register MI_INFO *info, register const unsigned char *old)
{
if (info->opt_flag & WRITE_CACHE_USED)
{
if (flush_io_cache(&info->rec_cache))
{
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)))
return(-1);
if (memcmp(info->rec_buff, old,
(uint) info->s->base.reclength))
{
errno=HA_ERR_RECORD_CHANGED; /* Record have changed */
return(1);
}
}
return(0);
}
int _mi_cmp_static_unique(MI_INFO *info, MI_UNIQUEDEF *def,
const unsigned char *record, internal::my_off_t pos)
{
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)))
return(-1);
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 internal::my_off_t pos,
register unsigned char *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)
{
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, unsigned char *buf,
register internal::my_off_t filepos,
bool skip_deleted_blocks)
{
int locked,error,cache_read;
MYISAM_SHARE *share=info->s;
cache_read=0;
if (info->opt_flag & WRITE_CACHE_USED &&
(info->rec_cache.pos_in_file <= filepos || skip_deleted_blocks) &&
flush_io_cache(&info->rec_cache))
return(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 */
}
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))
return(errno);
locked=1;
}
else
{ /* We don't nead new info */
#ifndef UNSAFE_LOCKING
locked=1;
#else
info->tmp_lock_type=F_RDLCK;
#endif
}
}
if (filepos >= info->state->data_file_length)
{
fast_mi_writeinfo(info);
return(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=errno=HA_ERR_RECORD_DELETED;
else
error=errno;
}
return(error);
}
/* Read record with cacheing */
error=my_b_read(&info->rec_cache,(unsigned char*) 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,(unsigned char*) tmp,
info->s->base.pack_reclength - info->s->base.reclength);
}
if (locked)
_mi_writeinfo(info,0); /* Unlock keyfile */
if (!error)
{
if (!buf[0])
{ /* Record is removed */
return(errno=HA_ERR_RECORD_DELETED);
}
/* Found and may be updated */
info->update|= HA_STATE_AKTIV | HA_STATE_KEY_CHANGED;
return(0);
}
/* errno should be set if rec_cache.error == -1 */
if (info->rec_cache.error != -1 || errno == 0)
errno=HA_ERR_WRONG_IN_RECORD;
return(errno); /* Something wrong (EOF?) */
}
|