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mariadb/storage/myisam/mi_open.c
Marko Mäkelä 270eeeb523 Merge 10.5 into 10.6
2023-05-23 12:25:39 +03:00

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/*
Copyright (c) 2000, 2011, Oracle and/or its affiliates
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 */
/*
open a isam-database
Internal temporary tables
-------------------------
Since only single instance of internal temporary table is required by
optimizer, such tables are not registered on myisam_open_list. In effect
it means (a) THR_LOCK_myisam is not held while such table is being created,
opened or closed; (b) no iteration through myisam_open_list while opening a
table. This optimization gives nice scalability benefit in concurrent
environment. MEMORY internal temporary tables are optimized similarly.
*/
#include "fulltext.h"
#include "sp_defs.h"
#include "rt_index.h"
#include <m_ctype.h>
#include <mysql_version.h>
#ifdef _WIN32
#include <fcntl.h>
#endif
static void setup_key_functions(MI_KEYDEF *keyinfo);
#define get_next_element(to,pos,size) { memcpy((char*) to,pos,(size_t) size); \
pos+=size;}
#define disk_pos_assert(pos, end_pos) \
if (pos > end_pos) \
{ \
my_errno=HA_ERR_CRASHED; \
goto err; \
}
/******************************************************************************
** Return the shared struct if the table is already open.
** In MySQL the server will handle version issues.
******************************************************************************/
MI_INFO *test_if_reopen(char *filename)
{
LIST *pos;
for (pos=myisam_open_list ; pos ; pos=pos->next)
{
MI_INFO *info=(MI_INFO*) pos->data;
MYISAM_SHARE *share=info->s;
DBUG_ASSERT(strcmp(share->unique_file_name,filename) ||
share->last_version);
if (!strcmp(share->unique_file_name,filename) && share->last_version)
return info;
}
return 0;
}
/******************************************************************************
open a MyISAM database.
See my_base.h for the handle_locking argument
if handle_locking and HA_OPEN_ABORT_IF_CRASHED then abort if the table
is marked crashed or if we are not using locking and the table doesn't
have an open count of 0.
******************************************************************************/
MI_INFO *mi_open(const char *name, int mode, uint open_flags)
{
int lock_error,kfile,open_mode,save_errno,have_rtree=0, realpath_err;
uint i,j,len,errpos,head_length,base_pos,offset,info_length,keys,
key_parts,unique_key_parts,base_key_parts,fulltext_keys,uniques;
uint internal_table= open_flags & HA_OPEN_INTERNAL_TABLE;
char name_buff[FN_REFLEN], org_name[FN_REFLEN], index_name[FN_REFLEN],
data_name[FN_REFLEN];
uchar *UNINIT_VAR(disk_cache), *disk_pos, *end_pos;
MI_INFO info,*UNINIT_VAR(m_info),*old_info= NULL;
MYISAM_SHARE share_buff,*share;
ulong *rec_per_key_part= 0;
my_off_t *key_root, *key_del;
ulonglong max_key_file_length, max_data_file_length;
DBUG_ENTER("mi_open");
kfile= -1;
lock_error=1;
errpos=0;
head_length=sizeof(share_buff.state.header);
bzero((uchar*) &info,sizeof(info));
realpath_err= my_realpath(name_buff,
fn_format(org_name,name,"",MI_NAME_IEXT,4),MYF(0));
if (realpath_err > 0) /* File not found, no point in looking further. */
{
DBUG_RETURN(NULL);
}
if (my_is_symlink(org_name) &&
(realpath_err || mysys_test_invalid_symlink(name_buff)))
{
my_errno= HA_WRONG_CREATE_OPTION;
DBUG_RETURN (NULL);
}
if (!internal_table)
{
mysql_mutex_lock(&THR_LOCK_myisam);
old_info= test_if_reopen(name_buff);
}
if (!old_info)
{
share= &share_buff;
bzero((uchar*) &share_buff,sizeof(share_buff));
share_buff.key_cache= multi_key_cache_search((uchar*) name_buff,
(uint)strlen(name_buff),
dflt_key_cache);
DBUG_EXECUTE_IF("myisam_pretend_crashed_table_on_open",
if (strstr(name, "crashed"))
{
my_errno= HA_ERR_CRASHED;
goto err;
});
DEBUG_SYNC_C("mi_open_kfile");
if ((kfile= mysql_file_open(mi_key_file_kfile, name_buff,
(open_mode= O_RDWR) | O_SHARE | O_NOFOLLOW | O_CLOEXEC,
MYF(MY_NOSYMLINKS))) < 0)
{
if ((errno != EROFS && errno != EACCES) ||
mode != O_RDONLY ||
(kfile= mysql_file_open(mi_key_file_kfile, name_buff,
(open_mode= O_RDONLY) | O_SHARE| O_NOFOLLOW | O_CLOEXEC,
MYF(MY_NOSYMLINKS))) < 0)
goto err;
}
share->mode=open_mode;
errpos=1;
if (mysql_file_read(kfile, (uchar*)&share->state.header, head_length,
MYF(MY_NABP)))
{
my_errno= HA_ERR_NOT_A_TABLE;
goto err;
}
if (bcmp(share->state.header.file_version, myisam_file_magic, 4))
{
DBUG_PRINT("error",("Wrong header in %s",name_buff));
DBUG_DUMP("error_dump", share->state.header.file_version,
(size_t) head_length);
my_errno=HA_ERR_NOT_A_TABLE;
goto err;
}
share->options= mi_uint2korr(share->state.header.options);
if (share->options &
~(HA_OPTION_PACK_RECORD | HA_OPTION_PACK_KEYS |
HA_OPTION_COMPRESS_RECORD | HA_OPTION_READ_ONLY_DATA |
HA_OPTION_TEMP_COMPRESS_RECORD | HA_OPTION_CHECKSUM |
HA_OPTION_TMP_TABLE | HA_OPTION_DELAY_KEY_WRITE |
HA_OPTION_RELIES_ON_SQL_LAYER | HA_OPTION_NULL_FIELDS))
{
DBUG_PRINT("error",("wrong options: 0x%lx", share->options));
my_errno=HA_ERR_OLD_FILE;
goto err;
}
if ((share->options & HA_OPTION_RELIES_ON_SQL_LAYER) &&
! (open_flags & HA_OPEN_FROM_SQL_LAYER))
{
DBUG_PRINT("error", ("table cannot be opened from non-sql layer"));
my_errno= HA_ERR_UNSUPPORTED;
goto err;
}
/* Don't call realpath() if the name can't be a link */
if (!strcmp(name_buff, org_name) ||
my_readlink(index_name, org_name, MYF(0)) == -1)
(void) strmov(index_name, org_name);
*strrchr(org_name, '.')= '\0';
(void) fn_format(data_name,org_name,"",MI_NAME_DEXT,
MY_APPEND_EXT|MY_UNPACK_FILENAME);
if (my_is_symlink(data_name))
{
if (my_realpath(data_name, data_name, MYF(0)))
goto err;
if (mysys_test_invalid_symlink(data_name))
{
my_errno= HA_WRONG_CREATE_OPTION;
goto err;
}
share->mode|= O_NOFOLLOW; /* all symlinks are resolved by realpath() */
}
info_length=mi_uint2korr(share->state.header.header_length);
base_pos=mi_uint2korr(share->state.header.base_pos);
if (!(disk_cache= (uchar*) my_alloca(info_length+128)))
{
my_errno=ENOMEM;
goto err;
}
end_pos=disk_cache+info_length;
errpos=2;
mysql_file_seek(kfile, 0L, MY_SEEK_SET, MYF(0));
if (!(open_flags & HA_OPEN_TMP_TABLE))
{
if ((lock_error=my_lock(kfile,F_RDLCK,0L,F_TO_EOF,
MYF(open_flags & HA_OPEN_WAIT_IF_LOCKED ?
0 : MY_SHORT_WAIT))) &&
!(open_flags & HA_OPEN_IGNORE_IF_LOCKED))
goto err;
}
errpos=3;
if (mysql_file_read(kfile, disk_cache, info_length, MYF(MY_NABP)))
{
my_errno=HA_ERR_CRASHED;
goto err;
}
len=mi_uint2korr(share->state.header.state_info_length);
keys= (uint) share->state.header.keys;
uniques= (uint) share->state.header.uniques;
fulltext_keys= (uint) share->state.header.fulltext_keys;
base_key_parts= key_parts= mi_uint2korr(share->state.header.key_parts);
unique_key_parts= mi_uint2korr(share->state.header.unique_key_parts);
if (len != MI_STATE_INFO_SIZE)
{
DBUG_PRINT("warning",
("saved_state_info_length: %d state_info_length: %d",
len,MI_STATE_INFO_SIZE));
}
share->state_diff_length=len-MI_STATE_INFO_SIZE;
if (!mi_state_info_read(disk_cache, &share->state))
goto err;
rec_per_key_part= share->state.rec_per_key_part;
key_root= share->state.key_root;
key_del= share->state.key_del;
len= mi_uint2korr(share->state.header.base_info_length);
if (len != MI_BASE_INFO_SIZE)
{
DBUG_PRINT("warning",("saved_base_info_length: %d base_info_length: %d",
len,MI_BASE_INFO_SIZE));
}
disk_pos= mi_n_base_info_read(disk_cache + base_pos, &share->base);
share->state.state_length=base_pos;
if (!(open_flags & HA_OPEN_FOR_REPAIR) &&
((share->state.changed & STATE_CRASHED) ||
((open_flags & HA_OPEN_ABORT_IF_CRASHED) &&
(my_disable_locking && share->state.open_count))))
{
DBUG_PRINT("error",("Table is marked as crashed. open_flags: %u "
"changed: %u open_count: %u !locking: %d",
open_flags, share->state.changed,
share->state.open_count, my_disable_locking));
my_errno=((share->state.changed & STATE_CRASHED_ON_REPAIR) ?
HA_ERR_CRASHED_ON_REPAIR : HA_ERR_CRASHED_ON_USAGE);
goto err;
}
/* sanity check */
if (share->base.keystart > 65535 ||
share->base.rec_reflength > 8 || share->base.key_reflength > 7)
{
my_errno=HA_ERR_CRASHED;
goto err;
}
key_parts+=fulltext_keys*FT_SEGS;
if (share->base.max_key_length > HA_MAX_KEY_BUFF || keys > MI_MAX_KEY ||
key_parts > MI_MAX_KEY * HA_MAX_KEY_SEG)
{
DBUG_PRINT("error",("Wrong key info: Max_key_length: %d keys: %d key_parts: %d", share->base.max_key_length, keys, key_parts));
my_errno=HA_ERR_UNSUPPORTED;
goto err;
}
/* Correct max_file_length based on length of sizeof(off_t) */
max_data_file_length=
(share->options & (HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ?
(((ulonglong) 1 << (share->base.rec_reflength*8))-1) :
(mi_safe_mul(share->base.pack_reclength,
(ulonglong) 1 << (share->base.rec_reflength*8))-1);
max_key_file_length=
mi_safe_mul(MI_MIN_KEY_BLOCK_LENGTH,
((ulonglong) 1 << (share->base.key_reflength*8))-1);
#if SIZEOF_OFF_T == 4
set_if_smaller(max_data_file_length, INT_MAX32);
set_if_smaller(max_key_file_length, INT_MAX32);
#endif
share->base.max_data_file_length=(my_off_t) max_data_file_length;
share->base.max_key_file_length=(my_off_t) max_key_file_length;
if (share->options & HA_OPTION_COMPRESS_RECORD)
share->base.max_key_length+=2; /* For safety */
/* Add space for node pointer */
share->base.max_key_length+= share->base.key_reflength;
if (!my_multi_malloc(mi_key_memory_MYISAM_SHARE, MYF(MY_WME),
&share,sizeof(*share),
&share->state.rec_per_key_part,
sizeof(long)*base_key_parts,
&share->keyinfo,keys*sizeof(MI_KEYDEF),
&share->uniqueinfo,uniques*sizeof(MI_UNIQUEDEF),
&share->keyparts,
(key_parts+unique_key_parts+keys+uniques) *
sizeof(HA_KEYSEG),
&share->rec,
(share->base.fields+1)*sizeof(MI_COLUMNDEF),
&share->blobs,sizeof(MI_BLOB)*share->base.blobs,
&share->unique_file_name,strlen(name_buff)+1,
&share->index_file_name,strlen(index_name)+1,
&share->data_file_name,strlen(data_name)+1,
&share->state.key_root,keys*sizeof(my_off_t),
&share->state.key_del,
(share->state.header.max_block_size_index*sizeof(my_off_t)),
&share->key_root_lock, sizeof(mysql_rwlock_t)*keys,
&share->mmap_lock, sizeof(mysql_rwlock_t),
NullS))
goto err;
errpos=4;
*share=share_buff;
memcpy((char*) share->state.rec_per_key_part,
(char*) rec_per_key_part, sizeof(long)*base_key_parts);
memcpy((char*) share->state.key_root,
(char*) key_root, sizeof(my_off_t)*keys);
memcpy((char*) share->state.key_del,
(char*) key_del, (sizeof(my_off_t) *
share->state.header.max_block_size_index));
strmov(share->unique_file_name, name_buff);
share->unique_name_length= (uint)strlen(name_buff);
strmov(share->index_file_name, index_name);
strmov(share->data_file_name, data_name);
share->vreclength= share->base.reclength;
share->blocksize=MY_MIN(IO_SIZE,myisam_block_size);
{
HA_KEYSEG *pos=share->keyparts;
uint32 ftkey_nr= 1;
for (i=0 ; i < keys ; i++)
{
MI_KEYDEF *keyinfo= share->keyinfo + i;
keyinfo->share= share;
disk_pos=mi_keydef_read(disk_pos, keyinfo);
disk_pos_assert(disk_pos + keyinfo->keysegs * HA_KEYSEG_SIZE, end_pos);
if (keyinfo->key_alg == HA_KEY_ALG_RTREE)
have_rtree=1;
set_if_smaller(share->blocksize, keyinfo->block_length);
keyinfo->seg= pos;
for (j=0 ; j < keyinfo->keysegs; j++,pos++)
{
disk_pos=mi_keyseg_read(disk_pos, pos);
if (pos->flag & HA_BLOB_PART &&
! (share->options & (HA_OPTION_COMPRESS_RECORD |
HA_OPTION_PACK_RECORD)))
{
my_errno= HA_ERR_CRASHED;
goto err;
}
if (pos->type == HA_KEYTYPE_TEXT ||
pos->type == HA_KEYTYPE_VARTEXT1 ||
pos->type == HA_KEYTYPE_VARTEXT2)
{
if (!pos->language)
pos->charset=default_charset_info;
else if (!(pos->charset= get_charset(pos->language, MYF(MY_WME))))
{
my_errno=HA_ERR_UNKNOWN_CHARSET;
goto err;
}
}
else if (pos->type == HA_KEYTYPE_BINARY)
pos->charset= &my_charset_bin;
}
if (keyinfo->flag & HA_SPATIAL)
{
#ifdef HAVE_SPATIAL
uint sp_segs= SPDIMS*2;
keyinfo->seg= pos - sp_segs;
DBUG_ASSERT(keyinfo->keysegs == sp_segs + 1);
keyinfo->keysegs= sp_segs;
#else
my_errno=HA_ERR_UNSUPPORTED;
goto err;
#endif
}
else if (keyinfo->flag & HA_FULLTEXT)
{
if (!fulltext_keys)
{ /* 4.0 compatibility code, to be removed in 5.0 */
keyinfo->seg= pos - FT_SEGS;
keyinfo->keysegs-= FT_SEGS;
}
else
{
uint k;
keyinfo->seg= pos;
for (k=0; k < FT_SEGS; k++)
{
*pos= ft_keysegs[k];
pos[0].language= pos[-1].language;
if (!(pos[0].charset= pos[-1].charset))
{
my_errno=HA_ERR_CRASHED;
goto err;
}
pos++;
}
}
if (!share->ft2_keyinfo.seg)
{
memcpy(& share->ft2_keyinfo, keyinfo, sizeof(MI_KEYDEF));
share->ft2_keyinfo.keysegs=1;
share->ft2_keyinfo.flag=0;
share->ft2_keyinfo.keylength=
share->ft2_keyinfo.minlength=
share->ft2_keyinfo.maxlength=HA_FT_WLEN+share->base.rec_reflength;
share->ft2_keyinfo.seg=pos-1;
share->ft2_keyinfo.end=pos;
setup_key_functions(& share->ft2_keyinfo);
}
keyinfo->ftkey_nr= ftkey_nr++;
}
setup_key_functions(keyinfo);
keyinfo->end= pos;
pos->type=HA_KEYTYPE_END; /* End */
pos->length=share->base.rec_reflength;
pos->null_bit=0;
pos->flag=0; /* For purify */
pos++;
}
for (i=0 ; i < uniques ; i++)
{
disk_pos=mi_uniquedef_read(disk_pos, &share->uniqueinfo[i]);
disk_pos_assert(disk_pos + share->uniqueinfo[i].keysegs *
HA_KEYSEG_SIZE, end_pos);
share->uniqueinfo[i].seg=pos;
for (j=0 ; j < share->uniqueinfo[i].keysegs; j++,pos++)
{
disk_pos=mi_keyseg_read(disk_pos, pos);
if (pos->type == HA_KEYTYPE_TEXT ||
pos->type == HA_KEYTYPE_VARTEXT1 ||
pos->type == HA_KEYTYPE_VARTEXT2)
{
if (!pos->language)
pos->charset=default_charset_info;
else if (!(pos->charset= get_charset(pos->language, MYF(MY_WME))))
{
my_errno=HA_ERR_UNKNOWN_CHARSET;
goto err;
}
}
}
share->uniqueinfo[i].end=pos;
pos->type=HA_KEYTYPE_END; /* End */
pos->null_bit=0;
pos->flag=0;
pos++;
}
share->ftkeys= ftkey_nr;
}
disk_pos_assert(disk_pos + share->base.fields *MI_COLUMNDEF_SIZE, end_pos);
for (i=j=offset=0 ; i < share->base.fields ; i++)
{
disk_pos=mi_recinfo_read(disk_pos,&share->rec[i]);
share->rec[i].pack_type=0;
share->rec[i].huff_tree=0;
share->rec[i].offset=offset;
if (share->rec[i].type == FIELD_BLOB)
{
share->blobs[j].pack_length=
share->rec[i].length - portable_sizeof_char_ptr;
share->blobs[j].offset=offset;
j++;
}
/* This is to detect how to calculate checksums */
if (share->rec[i].null_bit)
share->has_null_fields= 1;
if (share->rec[i].type == FIELD_VARCHAR)
share->has_varchar_fields= 1;
offset+=share->rec[i].length;
}
share->rec[i].type=(int) FIELD_LAST; /* End marker */
if (offset > share->base.reclength)
{
/* purecov: begin inspected */
my_errno= HA_ERR_CRASHED;
goto err;
/* purecov: end */
}
if (! lock_error)
{
(void) my_lock(kfile,F_UNLCK,0L,F_TO_EOF,MYF(MY_SEEK_NOT_DONE));
lock_error=1; /* Database unlocked */
}
if (mi_open_datafile(&info, share))
goto err;
errpos=5;
share->kfile=kfile;
share->this_process=(ulong) getpid();
share->last_process= share->state.process;
share->base.base_key_parts= base_key_parts;
share->base.key_parts=key_parts;
share->base.all_key_parts=key_parts+unique_key_parts;
if (!(share->last_version=share->state.version))
share->last_version=1; /* Safety */
share->rec_reflength=share->base.rec_reflength; /* May be changed */
share->base.margin_key_file_length=(share->base.max_key_file_length -
(keys ? MI_INDEX_BLOCK_MARGIN *
share->blocksize * keys : 0));
share->blocksize=MY_MIN(IO_SIZE,myisam_block_size);
share->data_file_type=STATIC_RECORD;
if (share->options & HA_OPTION_COMPRESS_RECORD)
{
share->data_file_type = COMPRESSED_RECORD;
share->options|= HA_OPTION_READ_ONLY_DATA;
info.s=share;
if (_mi_read_pack_info(&info,
(pbool)
MY_TEST(!(share->options &
(HA_OPTION_PACK_RECORD |
HA_OPTION_TEMP_COMPRESS_RECORD)))))
goto err;
}
else if (share->options & HA_OPTION_PACK_RECORD)
share->data_file_type = DYNAMIC_RECORD;
my_afree(disk_cache);
mi_setup_functions(share);
share->is_log_table= FALSE;
thr_lock_init(&share->lock);
mysql_mutex_init(mi_key_mutex_MYISAM_SHARE_intern_lock,
&share->intern_lock, MY_MUTEX_INIT_FAST);
for (i=0; i<keys; i++)
mysql_rwlock_init(mi_key_rwlock_MYISAM_SHARE_key_root_lock,
&share->key_root_lock[i]);
mysql_rwlock_init(mi_key_rwlock_MYISAM_SHARE_mmap_lock, &share->mmap_lock);
if (!thr_lock_inited)
{
/* Probably a single threaded program; Don't use concurrent inserts */
myisam_concurrent_insert=0;
}
else if (myisam_concurrent_insert)
{
share->concurrent_insert=
((share->options & (HA_OPTION_READ_ONLY_DATA | HA_OPTION_TMP_TABLE |
HA_OPTION_COMPRESS_RECORD |
HA_OPTION_TEMP_COMPRESS_RECORD)) ||
(open_flags & HA_OPEN_TMP_TABLE) ||
have_rtree) ? 0 : 1;
if (share->concurrent_insert)
{
share->lock.get_status=mi_get_status;
share->lock.copy_status=mi_copy_status;
share->lock.update_status=mi_update_status;
share->lock.restore_status= mi_restore_status;
share->lock.check_status=mi_check_status;
share->lock.fix_status= (void (*)(void *, void *)) mi_fix_status;
}
}
/*
Memory mapping can only be requested after initializing intern_lock.
*/
if (open_flags & HA_OPEN_MMAP)
{
info.s= share;
mi_extra(&info, HA_EXTRA_MMAP, 0);
}
}
else
{
share= old_info->s;
if (mode == O_RDWR && share->mode == O_RDONLY)
{
my_errno=EACCES; /* Can't open in write mode */
goto err;
}
if (mi_open_datafile(&info, share))
goto err;
errpos=5;
have_rtree= old_info->rtree_recursion_state != NULL;
}
/* alloc and set up private structure parts */
if (!my_multi_malloc(mi_key_memory_MI_INFO, MYF(MY_WME),
&m_info,sizeof(MI_INFO),
&info.blobs,sizeof(MI_BLOB)*share->base.blobs,
&info.buff,(share->base.max_key_block_length*2+
share->base.max_key_length),
&info.lastkey,share->base.max_key_length*3+1,
&info.first_mbr_key, share->base.max_key_length,
&info.filename,strlen(name)+1,
&info.rtree_recursion_state,have_rtree ? 1024 : 0,
NullS))
goto err;
errpos=6;
if (!have_rtree)
info.rtree_recursion_state= NULL;
strmov(info.filename,name);
memcpy(info.blobs,share->blobs,sizeof(MI_BLOB)*share->base.blobs);
info.lastkey2=info.lastkey+share->base.max_key_length;
info.s=share;
info.lastpos= HA_OFFSET_ERROR;
info.update= (short) (HA_STATE_NEXT_FOUND+HA_STATE_PREV_FOUND);
info.open_flag= open_flags;
info.opt_flag=READ_CHECK_USED;
info.this_unique= (ulong) info.dfile; /* Uniq number in process */
if (share->data_file_type == COMPRESSED_RECORD)
info.this_unique= share->state.unique;
info.this_loop=0; /* Update counter */
info.last_unique= share->state.unique;
info.last_loop= share->state.update_count;
if (mode == O_RDONLY)
share->options|=HA_OPTION_READ_ONLY_DATA;
info.lock_type=F_UNLCK;
info.quick_mode=0;
info.bulk_insert=0;
info.ft1_to_ft2=0;
info.errkey= -1;
info.page_changed=1;
mysql_mutex_lock(&share->intern_lock);
info.read_record=share->read_record;
share->reopen++;
share->write_flag=MYF(MY_NABP | MY_WAIT_IF_FULL);
if (share->options & HA_OPTION_READ_ONLY_DATA)
{
info.lock_type=F_RDLCK;
share->r_locks++;
share->tot_locks++;
}
if ((open_flags & HA_OPEN_TMP_TABLE) ||
(share->options & HA_OPTION_TMP_TABLE))
{
share->temporary=share->delay_key_write=1;
share->write_flag=MYF(MY_NABP);
share->w_locks++; /* We don't have to update status */
share->tot_locks++;
info.lock_type=F_WRLCK;
}
if (((open_flags & HA_OPEN_DELAY_KEY_WRITE) ||
(share->options & HA_OPTION_DELAY_KEY_WRITE)) &&
myisam_delay_key_write)
share->delay_key_write=1;
info.state= &share->state.state; /* Change global values by default */
mysql_mutex_unlock(&share->intern_lock);
/* Allocate buffer for one record */
/* prerequisites: bzero(info) && info->s=share; are met. */
if (!mi_alloc_rec_buff(&info, -1, &info.rec_buff))
goto err;
bzero(info.rec_buff, mi_get_rec_buff_len(&info, info.rec_buff));
*m_info=info;
thr_lock_data_init(&share->lock,&m_info->lock,(void*) m_info);
if (!internal_table)
{
m_info->open_list.data= (void*) m_info;
myisam_open_list= list_add(myisam_open_list, &m_info->open_list);
mysql_mutex_unlock(&THR_LOCK_myisam);
}
bzero(info.buff, share->base.max_key_block_length * 2);
my_free(rec_per_key_part);
if (myisam_log_file >= 0)
{
intern_filename(name_buff,share->index_file_name);
_myisam_log(MI_LOG_OPEN, m_info, (uchar*) name_buff, (uint)strlen(name_buff));
}
DBUG_RETURN(m_info);
err:
save_errno=my_errno ? my_errno : HA_ERR_END_OF_FILE;
if ((save_errno == HA_ERR_CRASHED) ||
(save_errno == HA_ERR_CRASHED_ON_USAGE) ||
(save_errno == HA_ERR_CRASHED_ON_REPAIR))
mi_report_error(save_errno, name);
switch (errpos) {
case 6:
my_free(m_info);
/* fall through */
case 5:
(void) mysql_file_close(info.dfile, MYF(0));
if (old_info)
break; /* Don't remove open table */
/* fall through */
case 4:
my_free(share);
/* fall through */
case 3:
if (! lock_error)
(void) my_lock(kfile, F_UNLCK, 0L, F_TO_EOF, MYF(MY_SEEK_NOT_DONE));
my_free(rec_per_key_part);
/* fall through */
case 2:
my_afree(disk_cache);
/* fall through */
case 1:
(void) mysql_file_close(kfile, MYF(0));
/* fall through */
case 0:
default:
break;
}
if (!internal_table)
mysql_mutex_unlock(&THR_LOCK_myisam);
my_errno=save_errno;
DBUG_RETURN (NULL);
} /* mi_open */
uchar *mi_alloc_rec_buff(MI_INFO *info, ulong length, uchar **buf)
{
uint extra;
uint32 UNINIT_VAR(old_length);
if (! *buf || length > (old_length=mi_get_rec_buff_len(info, *buf)))
{
uchar *newptr = *buf;
/* to simplify initial init of info->rec_buf in mi_open and mi_extra */
if (length == (ulong) -1)
{
if (info->s->options & HA_OPTION_COMPRESS_RECORD)
length= MY_MAX(info->s->base.pack_reclength, info->s->max_pack_length);
else
length= info->s->base.pack_reclength;
length= MY_MAX(length, info->s->base.max_key_length);
length= MY_MAX(length, info->s->vreclength);
/* Avoid unnecessary realloc */
if (newptr && length == old_length)
return newptr;
}
extra= ((info->s->options & HA_OPTION_PACK_RECORD) ?
ALIGN_SIZE(MI_MAX_DYN_BLOCK_HEADER)+MI_SPLIT_LENGTH+
MI_REC_BUFF_OFFSET : 0);
if (extra && newptr)
newptr-= MI_REC_BUFF_OFFSET;
if (!(newptr=(uchar*) my_realloc(mi_key_memory_record_buffer,
(uchar*)newptr, length + extra + 8,
MYF(MY_ALLOW_ZERO_PTR))))
return NULL;
*((uint32 *) newptr)= (uint32) length;
*buf= newptr+(extra ? MI_REC_BUFF_OFFSET : 0);
}
return *buf;
}
ulonglong mi_safe_mul(ulonglong a, ulonglong b)
{
ulonglong max_val= ~ (ulonglong) 0; /* my_off_t is unsigned */
if (!a || max_val / a < b)
return max_val;
return a*b;
}
/* Set up functions in structs */
void mi_setup_functions(register MYISAM_SHARE *share)
{
if (share->options & HA_OPTION_COMPRESS_RECORD)
{
share->read_record=_mi_read_pack_record;
share->read_rnd=_mi_read_rnd_pack_record;
if ((share->options &
(HA_OPTION_PACK_RECORD | HA_OPTION_NULL_FIELDS)) ||
share->has_varchar_fields)
share->calc_checksum= mi_checksum;
else
share->calc_checksum= mi_static_checksum;
share->calc_check_checksum= share->calc_checksum;
if (!(share->options & HA_OPTION_TEMP_COMPRESS_RECORD))
share->calc_checksum=0; /* No checksum */
}
else if (share->options & HA_OPTION_PACK_RECORD)
{
share->read_record=_mi_read_dynamic_record;
share->read_rnd=_mi_read_rnd_dynamic_record;
share->delete_record=_mi_delete_dynamic_record;
share->compare_record=_mi_cmp_dynamic_record;
share->compare_unique=_mi_cmp_dynamic_unique;
share->calc_checksum= mi_checksum;
share->calc_check_checksum= share->calc_checksum;
/* add bits used to pack data to pack_reclength for faster allocation */
share->base.pack_reclength+= share->base.pack_bits;
if (share->base.blobs)
{
share->update_record=_mi_update_blob_record;
share->write_record=_mi_write_blob_record;
}
else
{
share->write_record=_mi_write_dynamic_record;
share->update_record=_mi_update_dynamic_record;
}
}
else
{
share->read_record=_mi_read_static_record;
share->read_rnd=_mi_read_rnd_static_record;
share->delete_record=_mi_delete_static_record;
share->compare_record=_mi_cmp_static_record;
share->update_record=_mi_update_static_record;
share->write_record=_mi_write_static_record;
share->compare_unique=_mi_cmp_static_unique;
if (share->options & HA_OPTION_NULL_FIELDS)
share->calc_checksum= mi_checksum;
else
share->calc_checksum= mi_static_checksum;
share->calc_check_checksum= share->calc_checksum;
}
share->file_read= mi_nommap_pread;
share->file_write= mi_nommap_pwrite;
if (!(share->options & HA_OPTION_CHECKSUM))
share->calc_checksum=0;
return;
}
static void setup_key_functions(register MI_KEYDEF *keyinfo)
{
if (keyinfo->key_alg == HA_KEY_ALG_RTREE)
{
#ifdef HAVE_RTREE_KEYS
keyinfo->ck_insert = rtree_insert;
keyinfo->ck_delete = rtree_delete;
#else
DBUG_ASSERT(0); /* mi_open should check it never happens */
#endif
}
else
{
keyinfo->ck_insert = _mi_ck_write;
keyinfo->ck_delete = _mi_ck_delete;
}
if (keyinfo->flag & HA_BINARY_PACK_KEY)
{ /* Simple prefix compression */
keyinfo->bin_search=_mi_seq_search;
keyinfo->get_key=_mi_get_binary_pack_key;
keyinfo->pack_key=_mi_calc_bin_pack_key_length;
keyinfo->store_key=_mi_store_bin_pack_key;
}
else if (keyinfo->flag & HA_VAR_LENGTH_KEY)
{
keyinfo->get_key= _mi_get_pack_key;
if (keyinfo->seg[0].flag & HA_PACK_KEY)
{ /* Prefix compression */
/*
_mi_prefix_search() compares end-space against ASCII blank (' ').
It cannot be used for character sets, that do not encode the
blank character like ASCII does. UCS2 is an example. All
character sets with a fixed width > 1 or a mimimum width > 1
cannot represent blank like ASCII does. In these cases we have
to use _mi_seq_search() for the search.
*/
if (!keyinfo->seg->charset || use_strnxfrm(keyinfo->seg->charset) ||
(keyinfo->seg->flag & HA_NULL_PART) ||
(keyinfo->seg->charset->mbminlen > 1))
keyinfo->bin_search=_mi_seq_search;
else
keyinfo->bin_search=_mi_prefix_search;
keyinfo->pack_key=_mi_calc_var_pack_key_length;
keyinfo->store_key=_mi_store_var_pack_key;
}
else
{
keyinfo->bin_search=_mi_seq_search;
keyinfo->pack_key=_mi_calc_var_key_length; /* Variable length key */
keyinfo->store_key=_mi_store_static_key;
}
}
else
{
keyinfo->bin_search=_mi_bin_search;
keyinfo->get_key=_mi_get_static_key;
keyinfo->pack_key=_mi_calc_static_key_length;
keyinfo->store_key=_mi_store_static_key;
}
return;
}
/*
Function to save and store the header in the index file (.MYI)
*/
uint mi_state_info_write(File file, MI_STATE_INFO *state, uint pWrite)
{
uchar buff[MI_STATE_INFO_SIZE + MI_STATE_EXTRA_SIZE];
uchar *ptr=buff;
uint i, keys= (uint) state->header.keys,
key_blocks=state->header.max_block_size_index;
DBUG_ENTER("mi_state_info_write");
memcpy(ptr, &state->header, sizeof(state->header));
ptr+=sizeof(state->header);
/* open_count must be first because of _mi_mark_file_changed ! */
mi_int2store(ptr,state->open_count); ptr +=2;
*ptr++= (uchar)state->changed; *ptr++= state->sortkey;
mi_rowstore(ptr,state->state.records); ptr +=8;
mi_rowstore(ptr,state->state.del); ptr +=8;
mi_rowstore(ptr,state->split); ptr +=8;
mi_sizestore(ptr,state->dellink); ptr +=8;
mi_sizestore(ptr,state->state.key_file_length); ptr +=8;
mi_sizestore(ptr,state->state.data_file_length); ptr +=8;
mi_sizestore(ptr,state->state.empty); ptr +=8;
mi_sizestore(ptr,state->state.key_empty); ptr +=8;
mi_int8store(ptr,state->auto_increment); ptr +=8;
mi_int8store(ptr,(ulonglong) state->state.checksum);ptr +=8;
mi_int4store(ptr,state->process); ptr +=4;
mi_int4store(ptr,state->unique); ptr +=4;
mi_int4store(ptr,state->status); ptr +=4;
mi_int4store(ptr,state->update_count); ptr +=4;
ptr+=state->state_diff_length;
for (i=0; i < keys; i++)
{
mi_sizestore(ptr,state->key_root[i]); ptr +=8;
}
for (i=0; i < key_blocks; i++)
{
mi_sizestore(ptr,state->key_del[i]); ptr +=8;
}
if (pWrite & 2) /* From isamchk */
{
uint key_parts= mi_uint2korr(state->header.key_parts);
mi_int4store(ptr,state->sec_index_changed); ptr +=4;
mi_int4store(ptr,state->sec_index_used); ptr +=4;
mi_int4store(ptr,state->version); ptr +=4;
mi_int8store(ptr,state->key_map); ptr +=8;
mi_int8store(ptr,(ulonglong) state->create_time); ptr +=8;
mi_int8store(ptr,(ulonglong) state->recover_time); ptr +=8;
mi_int8store(ptr,(ulonglong) state->check_time); ptr +=8;
mi_sizestore(ptr,state->rec_per_key_rows); ptr+=8;
for (i=0 ; i < key_parts ; i++)
{
mi_int4store(ptr,state->rec_per_key_part[i]); ptr+=4;
}
}
if (pWrite & 1)
DBUG_RETURN(mysql_file_pwrite(file, buff, (size_t) (ptr-buff), 0L,
MYF(MY_NABP | MY_THREADSAFE)) != 0);
DBUG_RETURN(mysql_file_write(file, buff, (size_t) (ptr-buff),
MYF(MY_NABP)) != 0);
}
uchar *mi_state_info_read(uchar *ptr, MI_STATE_INFO *state)
{
uint i,keys,key_parts,key_blocks;
memcpy(&state->header, ptr, sizeof(state->header));
ptr +=sizeof(state->header);
keys=(uint) state->header.keys;
key_parts=mi_uint2korr(state->header.key_parts);
key_blocks=state->header.max_block_size_index;
state->open_count = mi_uint2korr(ptr); ptr +=2;
state->changed= *ptr++;
state->sortkey = (uint) *ptr++;
state->state.records= mi_rowkorr(ptr); ptr +=8;
state->state.del = mi_rowkorr(ptr); ptr +=8;
state->split = mi_rowkorr(ptr); ptr +=8;
state->dellink= mi_sizekorr(ptr); ptr +=8;
state->state.key_file_length = mi_sizekorr(ptr); ptr +=8;
state->state.data_file_length= mi_sizekorr(ptr); ptr +=8;
state->state.empty = mi_sizekorr(ptr); ptr +=8;
state->state.key_empty= mi_sizekorr(ptr); ptr +=8;
state->auto_increment=mi_uint8korr(ptr); ptr +=8;
state->state.checksum=(ha_checksum) mi_uint8korr(ptr); ptr +=8;
state->process= mi_uint4korr(ptr); ptr +=4;
state->unique = mi_uint4korr(ptr); ptr +=4;
state->status = mi_uint4korr(ptr); ptr +=4;
state->update_count=mi_uint4korr(ptr); ptr +=4;
ptr+= state->state_diff_length;
if (!state->rec_per_key_part)
{
if (!my_multi_malloc(mi_key_memory_MYISAM_SHARE, MYF(MY_WME),
&state->rec_per_key_part,sizeof(long)*key_parts,
&state->key_root, keys*sizeof(my_off_t),
&state->key_del, key_blocks*sizeof(my_off_t),
NullS))
return(0);
}
for (i=0; i < keys; i++)
{
state->key_root[i]= mi_sizekorr(ptr); ptr +=8;
}
for (i=0; i < key_blocks; i++)
{
state->key_del[i] = mi_sizekorr(ptr); ptr +=8;
}
state->sec_index_changed = mi_uint4korr(ptr); ptr +=4;
state->sec_index_used = mi_uint4korr(ptr); ptr +=4;
state->version = mi_uint4korr(ptr); ptr +=4;
state->key_map = mi_uint8korr(ptr); ptr +=8;
state->create_time = (time_t) mi_sizekorr(ptr); ptr +=8;
state->recover_time =(time_t) mi_sizekorr(ptr); ptr +=8;
state->check_time = (time_t) mi_sizekorr(ptr); ptr +=8;
state->rec_per_key_rows=mi_sizekorr(ptr); ptr +=8;
for (i=0 ; i < key_parts ; i++)
{
state->rec_per_key_part[i]= mi_uint4korr(ptr); ptr+=4;
}
return ptr;
}
uint mi_state_info_read_dsk(File file, MI_STATE_INFO *state, my_bool pRead)
{
uchar buff[MI_STATE_INFO_SIZE + MI_STATE_EXTRA_SIZE];
if (!myisam_single_user)
{
if (pRead)
{
if (mysql_file_pread(file, buff, state->state_length, 0L, MYF(MY_NABP)))
return 1;
}
else if (mysql_file_read(file, buff, state->state_length, MYF(MY_NABP)))
return 1;
mi_state_info_read(buff, state);
}
return 0;
}
/****************************************************************************
** store and read of MI_BASE_INFO
****************************************************************************/
uint mi_base_info_write(File file, MI_BASE_INFO *base)
{
uchar buff[MI_BASE_INFO_SIZE], *ptr=buff;
mi_sizestore(ptr,base->keystart); ptr +=8;
mi_sizestore(ptr,base->max_data_file_length); ptr +=8;
mi_sizestore(ptr,base->max_key_file_length); ptr +=8;
mi_rowstore(ptr,base->records); ptr +=8;
mi_rowstore(ptr,base->reloc); ptr +=8;
mi_int4store(ptr,base->mean_row_length); ptr +=4;
mi_int4store(ptr,base->reclength); ptr +=4;
mi_int4store(ptr,base->pack_reclength); ptr +=4;
mi_int4store(ptr,base->min_pack_length); ptr +=4;
mi_int4store(ptr,base->max_pack_length); ptr +=4;
mi_int4store(ptr,base->min_block_length); ptr +=4;
mi_int4store(ptr,base->fields); ptr +=4;
mi_int4store(ptr,base->pack_fields); ptr +=4;
*ptr++=base->rec_reflength;
*ptr++=base->key_reflength;
*ptr++=base->keys;
*ptr++=base->auto_key;
mi_int2store(ptr,base->pack_bits); ptr +=2;
mi_int2store(ptr,base->blobs); ptr +=2;
mi_int2store(ptr,base->max_key_block_length); ptr +=2;
mi_int2store(ptr,base->max_key_length); ptr +=2;
mi_int2store(ptr,base->extra_alloc_bytes); ptr +=2;
*ptr++= base->extra_alloc_procent;
bzero(ptr,13); ptr +=13; /* extra */
return mysql_file_write(file, buff, (size_t) (ptr-buff), MYF(MY_NABP)) != 0;
}
uchar *mi_n_base_info_read(uchar *ptr, MI_BASE_INFO *base)
{
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_uint4korr(ptr); ptr +=4;
base->pack_fields = mi_uint4korr(ptr); ptr +=4;
base->rec_reflength = *ptr++;
base->key_reflength = *ptr++;
base->keys= *ptr++;
base->auto_key= *ptr++;
base->pack_bits = 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+=13;
return ptr;
}
/*--------------------------------------------------------------------------
mi_keydef
---------------------------------------------------------------------------*/
uint mi_keydef_write(File file, MI_KEYDEF *keydef)
{
uchar buff[MI_KEYDEF_SIZE];
uchar *ptr=buff;
*ptr++ = (uchar) keydef->keysegs;
*ptr++ = keydef->key_alg; /* Rtree or Btree */
mi_int2store(ptr,keydef->flag); ptr +=2;
mi_int2store(ptr,keydef->block_length); ptr +=2;
mi_int2store(ptr,keydef->keylength); ptr +=2;
mi_int2store(ptr,keydef->minlength); ptr +=2;
mi_int2store(ptr,keydef->maxlength); ptr +=2;
return mysql_file_write(file, buff, (size_t) (ptr-buff), MYF(MY_NABP)) != 0;
}
uchar *mi_keydef_read(uchar *ptr, MI_KEYDEF *keydef)
{
keydef->keysegs = (uint) *ptr++;
keydef->key_alg = *ptr++; /* Rtree or Btree */
keydef->flag = mi_uint2korr(ptr); ptr +=2;
keydef->block_length = mi_uint2korr(ptr); ptr +=2;
keydef->keylength = mi_uint2korr(ptr); ptr +=2;
keydef->minlength = mi_uint2korr(ptr); ptr +=2;
keydef->maxlength = mi_uint2korr(ptr); ptr +=2;
keydef->block_size_index= keydef->block_length/MI_MIN_KEY_BLOCK_LENGTH-1;
keydef->underflow_block_length=keydef->block_length/3;
keydef->version = 0; /* Not saved */
keydef->parser = &ft_default_parser;
keydef->ftkey_nr = 0;
return ptr;
}
/***************************************************************************
** mi_keyseg
***************************************************************************/
int mi_keyseg_write(File file, const HA_KEYSEG *keyseg)
{
uchar buff[HA_KEYSEG_SIZE];
uchar *ptr=buff;
ulong pos;
*ptr++= keyseg->type;
*ptr++= keyseg->language & 0xFF; /* Collation ID, low byte */
*ptr++= keyseg->null_bit;
*ptr++= keyseg->bit_start;
*ptr++= keyseg->language >> 8; /* Collation ID, high byte */
*ptr++= keyseg->bit_length;
mi_int2store(ptr,keyseg->flag); ptr+=2;
mi_int2store(ptr,keyseg->length); ptr+=2;
mi_int4store(ptr,keyseg->start); ptr+=4;
pos= keyseg->null_bit ? keyseg->null_pos : keyseg->bit_pos;
mi_int4store(ptr, pos);
ptr+=4;
return mysql_file_write(file, buff, (size_t) (ptr-buff), MYF(MY_NABP)) != 0;
}
uchar *mi_keyseg_read(uchar *ptr, HA_KEYSEG *keyseg)
{
keyseg->type = *ptr++;
keyseg->language = *ptr++;
keyseg->null_bit = *ptr++;
keyseg->bit_start = *ptr++;
keyseg->language += ((uint16) (*ptr++)) << 8;
keyseg->bit_length = *ptr++;
keyseg->flag = mi_uint2korr(ptr); ptr +=2;
keyseg->length = mi_uint2korr(ptr); ptr +=2;
keyseg->start = mi_uint4korr(ptr); ptr +=4;
keyseg->null_pos = mi_uint4korr(ptr); ptr +=4;
keyseg->charset=0; /* Will be filled in later */
if (keyseg->null_bit)
/* We adjust bit_pos if null_bit is last in the byte */
keyseg->bit_pos= (uint16)(keyseg->null_pos + (keyseg->null_bit == (1 << 7)));
else
{
keyseg->bit_pos= (uint16)keyseg->null_pos;
keyseg->null_pos= 0;
}
return ptr;
}
/*--------------------------------------------------------------------------
mi_uniquedef
---------------------------------------------------------------------------*/
uint mi_uniquedef_write(File file, MI_UNIQUEDEF *def)
{
uchar buff[MI_UNIQUEDEF_SIZE];
uchar *ptr=buff;
mi_int2store(ptr,def->keysegs); ptr+=2;
*ptr++= (uchar) def->key;
*ptr++ = (uchar) def->null_are_equal;
return mysql_file_write(file, buff, (size_t) (ptr-buff), MYF(MY_NABP)) != 0;
}
uchar *mi_uniquedef_read(uchar *ptr, MI_UNIQUEDEF *def)
{
def->keysegs = mi_uint2korr(ptr);
def->key = ptr[2];
def->null_are_equal=ptr[3];
return ptr+4; /* 1 extra byte */
}
/***************************************************************************
** MI_COLUMNDEF
***************************************************************************/
uint mi_recinfo_write(File file, MI_COLUMNDEF *recinfo)
{
uchar buff[MI_COLUMNDEF_SIZE];
uchar *ptr=buff;
mi_int2store(ptr,recinfo->type); ptr +=2;
mi_int2store(ptr,recinfo->length); ptr +=2;
*ptr++ = recinfo->null_bit;
mi_int2store(ptr,recinfo->null_pos); ptr+= 2;
return mysql_file_write(file, buff, (size_t) (ptr-buff), MYF(MY_NABP)) != 0;
}
uchar *mi_recinfo_read(uchar *ptr, MI_COLUMNDEF *recinfo)
{
recinfo->type= mi_sint2korr(ptr); ptr +=2;
recinfo->length=mi_uint2korr(ptr); ptr +=2;
recinfo->null_bit= (uint8) *ptr++;
recinfo->null_pos=mi_uint2korr(ptr); ptr +=2;
return ptr;
}
/**************************************************************************
Open data file.
We can't use dup() here as the data file descriptors need to have different
active seek-positions.
*************************************************************************/
int mi_open_datafile(MI_INFO *info, MYISAM_SHARE *share)
{
myf flags= MY_WME | (share->mode & O_NOFOLLOW ? MY_NOSYMLINKS: 0);
DEBUG_SYNC_C("mi_open_datafile");
info->dfile= mysql_file_open(mi_key_file_dfile, share->data_file_name,
share->mode | O_SHARE | O_CLOEXEC, MYF(flags));
return info->dfile >= 0 ? 0 : 1;
}
int mi_open_keyfile(MYISAM_SHARE *share)
{
if ((share->kfile= mysql_file_open(mi_key_file_kfile,
share->unique_file_name,
share->mode | O_SHARE | O_NOFOLLOW | O_CLOEXEC,
MYF(MY_NOSYMLINKS | MY_WME))) < 0)
return 1;
return 0;
}
/*
Disable all indexes.
SYNOPSIS
mi_disable_indexes()
info A pointer to the MyISAM storage engine MI_INFO struct.
DESCRIPTION
Disable all indexes.
RETURN
0 ok
*/
int mi_disable_indexes(MI_INFO *info)
{
MYISAM_SHARE *share= info->s;
mi_clear_all_keys_active(share->state.key_map);
return 0;
}
/*
Enable all indexes
SYNOPSIS
mi_enable_indexes()
info A pointer to the MyISAM storage engine MI_INFO struct.
DESCRIPTION
Enable all indexes. The indexes might have been disabled
by mi_disable_index() before.
The function works only if both data and indexes are empty,
otherwise a repair is required.
To be sure, call handler::delete_all_rows() before.
RETURN
0 ok
HA_ERR_CRASHED data or index is non-empty.
*/
int mi_enable_indexes(MI_INFO *info)
{
int error= 0;
MYISAM_SHARE *share= info->s;
if (share->state.state.data_file_length ||
(share->state.state.key_file_length != share->base.keystart))
{
mi_print_error(info->s, HA_ERR_CRASHED);
error= HA_ERR_CRASHED;
}
else
mi_set_all_keys_active(share->state.key_map, share->base.keys);
return error;
}
/*
Test if indexes are disabled.
SYNOPSIS
mi_indexes_are_disabled()
info A pointer to the MyISAM storage engine MI_INFO struct.
DESCRIPTION
Test if indexes are disabled.
RETURN
0 indexes are not disabled
1 all indexes are disabled
2 non-unique indexes are disabled
*/
int mi_indexes_are_disabled(MI_INFO *info)
{
MYISAM_SHARE *share= info->s;
/*
No keys or all are enabled. keys is the number of keys. Left shifted
gives us only one bit set. When decreased by one, gives us all all bits
up to this one set and it gets unset.
*/
if (!share->base.keys ||
(mi_is_all_keys_active(share->state.key_map, share->base.keys)))
return 0;
/* All are disabled */
if (mi_is_any_key_active(share->state.key_map))
return 1;
/*
We have keys. Some enabled, some disabled.
Don't check for any non-unique disabled but return directly 2
*/
return 2;
}
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