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mi_open.cc
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/* Copyright (c) 2000, 2025, 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, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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 */
/*
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 "my_config.h"
#include <algorithm>
#include <memory>
#include <fcntl.h>
#include <sys/types.h>
#include <cerrno>
#include <ctime>
#include "m_string.h"
#include "my_byteorder.h"
#include "my_compiler.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_io.h"
#include "my_macros.h"
#include "my_pointer_arithmetic.h"
#include "mysql/strings/m_ctype.h"
#include "nulls.h"
#include "sql/field.h"
#include "storage/myisam/fulltext.h"
#include "storage/myisam/myisam_sys.h"
#include "storage/myisam/myisamdef.h"
#include "storage/myisam/rt_index.h"
#include "storage/myisam/sp_defs.h"
#ifdef _WIN32
#include <fcntl.h>
#include <process.h>
#endif
static void setup_key_functions(MI_KEYDEF *keyinfo);
#define disk_pos_assert(pos, end_pos) \
if (pos > end_pos) { \
set_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) {
auto *info = (MI_INFO *)pos->data;
MYISAM_SHARE *share = info->s;
if (!strcmp(share->unique_file_name, filename) && share->last_version)
return info;
}
return nullptr;
}
/******************************************************************************
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_share(const char *name, MYISAM_SHARE *old_share, int mode,
uint open_flags) {
int lock_error, kfile, open_mode, save_errno, realpath_err;
uint i, j, len, errpos, head_length, base_pos, offset, info_length, keys,
key_parts, unique_key_parts, fulltext_keys, uniques;
uint const 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 *disk_cache, *disk_pos, *end_pos;
MI_INFO info, *m_info;
MYISAM_SHARE share_buff, *share;
ulong rec_per_key_part[HA_MAX_POSSIBLE_KEY * MI_MAX_KEY_SEG];
my_off_t key_root[HA_MAX_POSSIBLE_KEY], key_del[MI_MAX_KEY_BLOCK_SIZE];
ulonglong max_key_file_length, max_data_file_length;
ST_FILE_ID file_id = {0, 0};
DBUG_TRACE;
m_info = nullptr;
kfile = -1;
lock_error = 1;
errpos = 0;
head_length = sizeof(share_buff.state.header);
memset(&info, 0, sizeof(info));
realpath_err = my_realpath(
name_buff, fn_format(org_name, name, "", MI_NAME_IEXT, 4), MYF(0));
if (my_is_symlink(name_buff, &file_id)) {
if (realpath_err || (*myisam_test_invalid_symlink)(name_buff) ||
my_is_symlink(name_buff, &file_id)) {
set_my_errno(HA_WRONG_CREATE_OPTION);
return nullptr;
}
}
if (!internal_table) {
mysql_mutex_lock(&THR_LOCK_myisam);
if (!old_share && !(open_flags & HA_OPEN_FROM_SQL_LAYER)) {
MI_INFO *old_info = test_if_reopen(name_buff);
if (old_info) old_share = old_info->s;
}
}
if (!old_share) {
share = &share_buff;
memset(&share_buff, 0, sizeof(share_buff));
share_buff.state.rec_per_key_part = rec_per_key_part;
share_buff.state.key_root = key_root;
share_buff.state.key_del = key_del;
share_buff.key_cache =
multi_key_cache_search((uchar *)name_buff, strlen(name_buff));
DBUG_EXECUTE_IF(
"myisam_pretend_crashed_table_on_open", if (strstr(name, "/t1")) {
set_my_errno(HA_ERR_CRASHED);
goto err;
});
DEBUG_SYNC_C("before_opening_indexfile");
if ((kfile = mysql_file_open(mi_key_file_kfile, name_buff,
(open_mode = O_RDWR) | O_NOFOLLOW, MYF(0))) <
0) {
if ((errno != EROFS && errno != EACCES) || mode != O_RDONLY ||
(kfile = mysql_file_open(mi_key_file_kfile, name_buff,
(open_mode = O_RDONLY) | O_NOFOLLOW,
MYF(0))) < 0)
goto err;
}
if (!my_is_same_file(kfile, &file_id)) {
mysql_file_close(kfile, MYF(0));
set_my_errno(HA_WRONG_CREATE_OPTION);
goto err;
}
share->mode = open_mode;
errpos = 1;
if (mysql_file_read(kfile, share->state.header.file_version, head_length,
MYF(MY_NABP))) {
set_my_errno(HA_ERR_NOT_A_TABLE);
goto err;
}
if (memcmp((uchar *)share->state.header.file_version,
(uchar *)myisam_file_magic, 4) != 0) {
DBUG_PRINT("error", ("Wrong header in %s", name_buff));
DBUG_DUMP("error_dump", share->state.header.file_version, head_length);
set_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)) {
DBUG_PRINT("error", ("wrong options: 0x%lx", share->options));
set_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 openned from non-sql layer"));
set_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)my_stpcpy(index_name, org_name);
*strrchr(org_name, '.') = '\0';
(void)fn_format(data_name, org_name, "", MI_NAME_DEXT,
MY_APPEND_EXT | MY_UNPACK_FILENAME | MY_RESOLVE_SYMLINKS);
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))) {
set_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,
MYF(open_flags & HA_OPEN_WAIT_IF_LOCKED ? 0 : MY_DONT_WAIT))) &&
!(open_flags & HA_OPEN_IGNORE_IF_LOCKED))
goto err;
}
errpos = 3;
if (mysql_file_read(kfile, disk_cache, info_length, MYF(MY_NABP))) {
set_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;
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;
mi_state_info_read(disk_cache, &share->state);
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 = my_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));
set_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) {
set_my_errno(HA_ERR_CRASHED);
goto err;
}
key_parts += fulltext_keys * FT_SEGS;
if (share->base.max_key_length > MI_MAX_KEY_BUFF || keys > MI_MAX_KEY ||
key_parts > MI_MAX_KEY * MI_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));
set_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);
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, MY_WME, &share, sizeof(*share),
&share->state.rec_per_key_part, sizeof(long) * 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) * 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));
my_stpcpy(share->unique_file_name, name_buff);
share->unique_name_length = strlen(name_buff);
my_stpcpy(share->index_file_name, index_name);
my_stpcpy(share->data_file_name, data_name);
share->blocksize = std::min(ulong{IO_SIZE}, myisam_block_size);
{
HA_KEYSEG *pos = share->keyparts;
uint32 ftkey_nr = 1;
for (i = 0; i < keys; i++) {
share->keyinfo[i].share = share;
disk_pos = mi_keydef_read(disk_pos, &share->keyinfo[i]);
disk_pos_assert(disk_pos + share->keyinfo[i].keysegs * HA_KEYSEG_SIZE,
end_pos);
if (share->keyinfo[i].key_alg == HA_KEY_ALG_RTREE)
share->have_rtree = true;
share->blocksize =
std::min(share->blocksize, uint(share->keyinfo[i].block_length));
share->keyinfo[i].seg = pos;
for (j = 0; j < share->keyinfo[i].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))) {
set_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)))) {
set_my_errno(HA_ERR_UNKNOWN_CHARSET);
goto err;
}
} else if (pos->type == HA_KEYTYPE_BINARY)
pos->charset = &my_charset_bin;
if (!(share->keyinfo[i].flag & HA_SPATIAL) &&
pos->start > share->base.reclength) {
set_my_errno(HA_ERR_CRASHED);
goto err;
}
}
if (share->keyinfo[i].flag & HA_SPATIAL) {
uint const sp_segs = SPDIMS * 2;
share->keyinfo[i].seg = pos - sp_segs;
share->keyinfo[i].keysegs--;
} else if (share->keyinfo[i].flag & HA_FULLTEXT) {
if (!fulltext_keys) { /* 4.0 compatibility code, to be removed in 5.0
*/
share->keyinfo[i].seg = pos - FT_SEGS;
share->keyinfo[i].keysegs -= FT_SEGS;
} else {
uint k;
share->keyinfo[i].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)) {
set_my_errno(HA_ERR_CRASHED);
goto err;
}
pos++;
}
}
if (!share->ft2_keyinfo.seg) {
memcpy(&share->ft2_keyinfo, &share->keyinfo[i], 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);
}
share->keyinfo[i].ftkey_nr = ftkey_nr++;
}
setup_key_functions(share->keyinfo + i);
share->keyinfo[i].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)))) {
set_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 = nullptr;
share->rec[i].offset = offset;
if (share->rec[i].type == (int)FIELD_BLOB) {
share->blobs[j].pack_length =
share->rec[i].length - portable_sizeof_char_ptr;
share->blobs[j].offset = offset;
j++;
}
offset += share->rec[i].length;
}
share->rec[i].type = (int)FIELD_LAST; /* End marker */
if (offset > share->base.reclength) {
/* purecov: begin inspected */
set_my_errno(HA_ERR_CRASHED);
goto err;
/* purecov: end */
}
if (!lock_error) {
(void)my_lock(kfile, F_UNLCK, MYF(MY_SEEK_NOT_DONE));
lock_error = 1; /* Database unlocked */
}
if (mi_open_datafile(&info, share, name, -1)) goto err;
errpos = 5;
share->kfile = kfile;
share->this_process = (ulong)getpid();
share->last_process = share->state.process;
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 = std::min(ulong{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, !(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;
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 (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) || share->have_rtree);
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;
}
}
} else {
share = old_share;
if (mode == O_RDWR && share->mode == O_RDONLY) {
set_my_errno(EACCES); /* Can't open in write mode */
goto err;
}
if (mi_open_datafile(&info, share, name, -1)) goto err;
errpos = 5;
}
/* alloc and set up private structure parts */
if (!my_multi_malloc(
mi_key_memory_MI_INFO, 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.rnext_same_key, share->base.max_key_length, &info.first_mbr_key,
share->base.max_key_length, &info.filename, strlen(name) + 1,
&info.rtree_recursion_state, share->have_rtree ? 1024 : 0, NullS))
goto err;
errpos = 6;
if (!share->have_rtree) info.rtree_recursion_state = nullptr;
my_stpcpy(info.filename, name);
memcpy(info.blobs, share->blobs, sizeof(MI_BLOB) * share->base.blobs);
info.lastkey2 = info.lastkey + share->base.max_key_length;
/*
If only mi_rkey is called earlier, rnext_same_key should be set in
mi_rnext_same.
*/
info.set_rnext_same_key = false;
info.s = share;
info.lastpos = HA_OFFSET_ERROR;
info.update = (short)(HA_STATE_NEXT_FOUND + HA_STATE_PREV_FOUND);
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 = false;
info.bulk_insert = nullptr;
info.ft1_to_ft2 = nullptr;
info.errkey = -1;
info.page_changed = true;
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 = true;
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 = true;
info.state = &share->state.state; /* Change global values by default */
mysql_mutex_unlock(&share->intern_lock);
/* Allocate buffer for one record */
/* prerequisites: memset(&info, 0) && info->s=share; are met. */
if (!mi_alloc_rec_buff(&info, -1, &info.rec_buff)) goto err;
memset(info.rec_buff, 0, mi_get_rec_buff_len(&info, info.rec_buff));
new (m_info) MI_INFO(std::move(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);
}
memset(info.buff, 0, share->base.max_key_block_length * 2);
if (myisam_log_file >= 0) {
intern_filename(name_buff, share->index_file_name);
_myisam_log(MI_LOG_OPEN, m_info, (uchar *)name_buff, strlen(name_buff));
}
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);
[[fallthrough]];
case 5:
(void)mysql_file_close(info.dfile, MYF(0));
if (old_share) break; /* Don't remove open table */
[[fallthrough]];
case 4:
my_free(share);
[[fallthrough]];
case 3:
if (!lock_error) (void)my_lock(kfile, F_UNLCK, MYF(MY_SEEK_NOT_DONE));
[[fallthrough]];
case 2:
[[fallthrough]];
case 1:
(void)mysql_file_close(kfile, MYF(0));
[[fallthrough]];
case 0:
default:
break;
}
if (!internal_table) mysql_mutex_unlock(&THR_LOCK_myisam);
set_my_errno(save_errno);
return nullptr;
} /* mi_open_share */
uchar *mi_alloc_rec_buff(MI_INFO *info, ulong length, uchar **buf) {
uint extra;
uint32 old_length = 0;
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 =
std::max(info->s->base.pack_reclength, info->s->max_pack_length);
else
length = info->s->base.pack_reclength;
length = std::max<ulong>(length, info->s->base.max_key_length);
/* 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 newptr;
*((uint32 *)newptr) = (uint32)length;
*buf = newptr + (extra ? MI_REC_BUFF_OFFSET : 0);
}
return *buf;
}
ulonglong mi_safe_mul(ulonglong a, ulonglong b) {
ulonglong const 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(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_TEMP_COMPRESS_RECORD))
share->calc_checksum = nullptr; /* No checksum */
else if (share->options & HA_OPTION_PACK_RECORD)
share->calc_checksum = mi_checksum;
else
share->calc_checksum = mi_static_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;
/* 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;
share->calc_checksum = mi_static_checksum;
}
share->file_read = mi_nommap_pread;
share->file_write = mi_nommap_pwrite;
if (!(share->options & HA_OPTION_CHECKSUM)) share->calc_checksum = nullptr;
}
static void setup_key_functions(MI_KEYDEF *keyinfo) {
if (keyinfo->key_alg == HA_KEY_ALG_RTREE) {
keyinfo->ck_insert = rtree_insert;
keyinfo->ck_delete = rtree_delete;
} 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 minimum 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;
}
}
/*
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_TRACE;
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 const 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)
return mysql_file_pwrite(file, buff, (size_t)(ptr - buff), 0L,
MYF(MY_NABP)) != 0;
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;
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, 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;