summaryrefslogtreecommitdiffstats
path: root/storage/maria/ma_statrec.c
diff options
context:
space:
mode:
Diffstat (limited to 'storage/maria/ma_statrec.c')
-rw-r--r--storage/maria/ma_statrec.c299
1 files changed, 299 insertions, 0 deletions
diff --git a/storage/maria/ma_statrec.c b/storage/maria/ma_statrec.c
new file mode 100644
index 00000000..98fa235a
--- /dev/null
+++ b/storage/maria/ma_statrec.c
@@ -0,0 +1,299 @@
+/* Copyright (C) 2006 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+ /* Functions to handle fixed-length-records */
+
+#include "maria_def.h"
+
+
+my_bool _ma_write_static_record(MARIA_HA *info, const uchar *record)
+{
+ uchar temp[8]; /* max pointer length */
+ if (info->s->state.dellink != HA_OFFSET_ERROR &&
+ !info->append_insert_at_end)
+ {
+ my_off_t filepos=info->s->state.dellink;
+ info->rec_cache.seek_not_done=1; /* We have done a seek */
+ if (info->s->file_read(info, &temp[0],info->s->base.rec_reflength,
+ info->s->state.dellink+1,
+ MYF(MY_NABP)))
+ goto err;
+ info->s->state.dellink= _ma_rec_pos(info->s, temp);
+ info->state->del--;
+ info->state->empty-=info->s->base.pack_reclength;
+ if (info->s->file_write(info, record, info->s->base.reclength,
+ filepos, MYF(MY_NABP)))
+ goto err;
+ }
+ else
+ {
+ if (info->state->data_file_length > info->s->base.max_data_file_length-
+ info->s->base.pack_reclength)
+ {
+ my_errno=HA_ERR_RECORD_FILE_FULL;
+ return(2);
+ }
+ if (info->opt_flag & WRITE_CACHE_USED)
+ { /* Cash in use */
+ if (my_b_write(&info->rec_cache, record,
+ info->s->base.reclength))
+ goto err;
+ if (info->s->base.pack_reclength != info->s->base.reclength)
+ {
+ uint length=info->s->base.pack_reclength - info->s->base.reclength;
+ bzero(temp,length);
+ if (my_b_write(&info->rec_cache, temp,length))
+ goto err;
+ }
+ }
+ else
+ {
+ info->rec_cache.seek_not_done=1; /* We have done a seek */
+ if (info->s->file_write(info, record, info->s->base.reclength,
+ info->state->data_file_length,
+ info->s->write_flag))
+ goto err;
+ if (info->s->base.pack_reclength != info->s->base.reclength)
+ {
+ uint length=info->s->base.pack_reclength - info->s->base.reclength;
+ bzero(temp,length);
+ if (info->s->file_write(info, temp,length,
+ info->state->data_file_length+
+ info->s->base.reclength,
+ info->s->write_flag))
+ goto err;
+ }
+ }
+ info->state->data_file_length+=info->s->base.pack_reclength;
+ info->s->state.split++;
+ }
+ return 0;
+ err:
+ return 1;
+}
+
+my_bool _ma_update_static_record(MARIA_HA *info, MARIA_RECORD_POS pos,
+ const uchar *oldrec __attribute__ ((unused)),
+ const uchar *record)
+{
+ info->rec_cache.seek_not_done=1; /* We have done a seek */
+ return (info->s->file_write(info,
+ record, info->s->base.reclength,
+ pos,
+ MYF(MY_NABP)) != 0);
+}
+
+
+my_bool _ma_delete_static_record(MARIA_HA *info,
+ const uchar *record __attribute__ ((unused)))
+{
+ uchar temp[9]; /* 1+sizeof(uint32) */
+ info->state->del++;
+ info->state->empty+=info->s->base.pack_reclength;
+ temp[0]= '\0'; /* Mark that record is deleted */
+ _ma_dpointer(info->s, temp+1, info->s->state.dellink);
+ info->s->state.dellink= info->cur_row.lastpos;
+ info->rec_cache.seek_not_done=1;
+ return (info->s->file_write(info, temp, 1+info->s->rec_reflength,
+ info->cur_row.lastpos, MYF(MY_NABP)) != 0);
+}
+
+
+my_bool _ma_cmp_static_record(register MARIA_HA *info,
+ register const uchar *old)
+{
+ DBUG_ENTER("_ma_cmp_static_record");
+
+ if (info->opt_flag & WRITE_CACHE_USED)
+ {
+ if (flush_io_cache(&info->rec_cache))
+ {
+ DBUG_RETURN(1);
+ }
+ info->rec_cache.seek_not_done=1; /* We have done a seek */
+ }
+
+ if ((info->opt_flag & READ_CHECK_USED))
+ { /* If check isn't disabled */
+ info->rec_cache.seek_not_done=1; /* We have done a seek */
+ if (info->s->file_read(info, info->rec_buff, info->s->base.reclength,
+ info->cur_row.lastpos, MYF(MY_NABP)))
+ DBUG_RETURN(1);
+ if (memcmp(info->rec_buff, old, (uint) info->s->base.reclength))
+ {
+ DBUG_DUMP("read",old,info->s->base.reclength);
+ DBUG_DUMP("disk",info->rec_buff,info->s->base.reclength);
+ my_errno=HA_ERR_RECORD_CHANGED; /* Record have changed */
+ DBUG_RETURN(1);
+ }
+ }
+ DBUG_RETURN(0);
+}
+
+
+my_bool _ma_cmp_static_unique(MARIA_HA *info, MARIA_UNIQUEDEF *def,
+ const uchar *record, MARIA_RECORD_POS pos)
+{
+ DBUG_ENTER("_ma_cmp_static_unique");
+
+ info->rec_cache.seek_not_done=1; /* We have done a seek */
+ if (info->s->file_read(info, info->rec_buff, info->s->base.reclength,
+ pos, MYF(MY_NABP)))
+ DBUG_RETURN(1);
+ DBUG_RETURN(_ma_unique_comp(def, record, info->rec_buff,
+ def->null_are_equal));
+}
+
+
+/*
+ Read a fixed-length-record
+
+ RETURN
+ 0 Ok
+ 1 record delete
+ -1 on read-error or locking-error
+*/
+
+int _ma_read_static_record(register MARIA_HA *info, register uchar *record,
+ MARIA_RECORD_POS pos)
+{
+ int error;
+ DBUG_ENTER("_ma_read_static_record");
+
+ if (pos != HA_OFFSET_ERROR)
+ {
+ if (info->opt_flag & WRITE_CACHE_USED &&
+ info->rec_cache.pos_in_file <= pos &&
+ flush_io_cache(&info->rec_cache))
+ DBUG_RETURN(my_errno);
+ info->rec_cache.seek_not_done=1; /* We have done a seek */
+
+ error= (int) info->s->file_read(info, record,info->s->base.reclength,
+ pos, MYF(MY_NABP));
+ if (! error)
+ {
+ fast_ma_writeinfo(info);
+ if (!*record)
+ {
+ /* Record is deleted */
+ DBUG_PRINT("warning", ("Record is deleted"));
+ DBUG_RETURN((my_errno=HA_ERR_RECORD_DELETED));
+ }
+ info->update|= HA_STATE_AKTIV; /* Record is read */
+ DBUG_RETURN(0);
+ }
+ }
+ fast_ma_writeinfo(info); /* No such record */
+ DBUG_RETURN(my_errno);
+}
+
+
+/**
+ @brief Read record from given position or next record
+
+ @note
+ When scanning, this function will return HA_ERR_RECORD_DELETED
+ for deleted rows even if skip_deleted_blocks is set.
+ The reason for this is to allow the caller to calculate the record
+ position without having to do call maria_position() for each record.
+*/
+
+int _ma_read_rnd_static_record(MARIA_HA *info, uchar *buf,
+ MARIA_RECORD_POS filepos,
+ my_bool skip_deleted_blocks)
+{
+ int locked,error,cache_read;
+ uint cache_length;
+ MARIA_SHARE *share= info->s;
+ DBUG_ENTER("_ma_read_rnd_static_record");
+
+ cache_read=0;
+ cache_length=0;
+ if (info->opt_flag & READ_CACHE_USED)
+ { /* Cache in use */
+ if (filepos == my_b_tell(&info->rec_cache) &&
+ (skip_deleted_blocks || !filepos))
+ {
+ cache_read=1; /* Read record using cache */
+ cache_length= (uint) (info->rec_cache.read_end -
+ info->rec_cache.read_pos);
+ }
+ else
+ info->rec_cache.seek_not_done=1; /* Filepos is changed */
+ }
+ locked=0;
+ if (info->lock_type == F_UNLCK)
+ {
+ if (filepos >= info->state->data_file_length)
+ { /* Test if new records */
+ if (_ma_readinfo(info,F_RDLCK,0))
+ DBUG_RETURN(my_errno);
+ locked=1;
+ }
+ else
+ { /* We don't nead new info */
+#ifndef UNSAFE_LOCKING
+ if ((! cache_read || share->base.reclength > cache_length) &&
+ share->tot_locks == 0)
+ { /* record not in cache */
+ locked=1;
+ }
+#else
+ info->tmp_lock_type=F_RDLCK;
+#endif
+ }
+ }
+ if (filepos >= info->state->data_file_length)
+ {
+ DBUG_PRINT("test",("filepos: %ld (%ld) records: %ld del: %ld",
+ (long) filepos/share->base.reclength, (long) filepos,
+ (long) info->state->records, (long) info->state->del));
+ fast_ma_writeinfo(info);
+ DBUG_RETURN(my_errno=HA_ERR_END_OF_FILE);
+ }
+ info->cur_row.lastpos= filepos;
+ info->cur_row.nextpos= filepos+share->base.pack_reclength;
+
+ if (! cache_read) /* No cacheing */
+ {
+ error= _ma_read_static_record(info, buf, filepos);
+ DBUG_RETURN(error);
+ }
+
+ /* Read record with cacheing */
+ error=my_b_read(&info->rec_cache, buf, share->base.reclength);
+ if (info->s->base.pack_reclength != info->s->base.reclength && !error)
+ {
+ uchar tmp[8]; /* Skill fill bytes */
+ error=my_b_read(&info->rec_cache, tmp,
+ info->s->base.pack_reclength - info->s->base.reclength);
+ }
+ if (locked)
+ _ma_writeinfo(info,0); /* Unlock keyfile */
+ if (!error)
+ {
+ if (!buf[0])
+ { /* Record is removed */
+ DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED);
+ }
+ /* Found and may be updated */
+ info->update|= HA_STATE_AKTIV | HA_STATE_KEY_CHANGED;
+ DBUG_RETURN(0);
+ }
+ /* my_errno should be set if rec_cache.error == -1 */
+ if (info->rec_cache.error != -1 || my_errno == 0)
+ _ma_set_fatal_error(share, HA_ERR_WRONG_IN_RECORD);
+ DBUG_RETURN(my_errno); /* Something wrong (EOF?) */
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 07:05:35 +0000