diff options
Diffstat (limited to 'storage/myisam/mi_open.c')
| -rw-r--r-- | storage/myisam/mi_open.c | 1388 |
1 files changed, 1388 insertions, 0 deletions
diff --git a/storage/myisam/mi_open.c b/storage/myisam/mi_open.c new file mode 100644 index 00000000..8b82a71f --- /dev/null +++ b/storage/myisam/mi_open.c @@ -0,0 +1,1388 @@ +/* + 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; +} |