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changed to use IO_CACHE instead of FILE

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This commit is contained in:
monty@narttu.mysql.fi
2000-11-15 23:00:06 +02:00
parent 7a013339f8
commit e69becf133
24 changed files with 828 additions and 833 deletions
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43
mysys/mf_iocache.c
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@@ -22,10 +22,13 @@
(and get a EOF-error).
Possibly use of asyncronic io.
macros for read and writes for faster io.
Used instead of FILE when reading or writing hole files.
This shall make mf_rec_cache obsolite.
One can change info->pos_in_file to a higer value to skipp bytes in file if
Used instead of FILE when reading or writing whole files.
This will make mf_rec_cache obsolete.
One can change info->pos_in_file to a higher value to skip bytes in file if
also info->rc_pos is set to info->rc_end.
If called through open_cached_file(), then the temporary file will
only be created if a write exeeds the file buffer or if one calls
flush_io_cache().
*/
#define MAP_TO_USE_RAID
@@ -40,7 +43,7 @@ static void my_aiowait(my_aio_result *result);
/*
** if cachesize == 0 then use default cachesize (from s-file)
** if file == -1 then real_open_cached_file() will be called to
** if file == -1 then real_open_cached_file() will be called.
** returns 0 if ok
*/
@@ -59,17 +62,24 @@ int init_io_cache(IO_CACHE *info, File file, uint cachesize,
min_cache=use_async_io ? IO_SIZE*4 : IO_SIZE*2;
if (type == READ_CACHE)
{ /* Assume file isn't growing */
my_off_t file_pos,end_of_file;
if ((file_pos=my_tell(file,MYF(0)) == MY_FILEPOS_ERROR))
DBUG_RETURN(1);
end_of_file=my_seek(file,0L,MY_SEEK_END,MYF(0));
if (end_of_file < seek_offset)
end_of_file=seek_offset;
VOID(my_seek(file,file_pos,MY_SEEK_SET,MYF(0)));
if ((my_off_t) cachesize > end_of_file-seek_offset+IO_SIZE*2-1)
if (cache_myflags & MY_DONT_CHECK_FILESIZE)
{
cachesize=(uint) (end_of_file-seek_offset)+IO_SIZE*2-1;
use_async_io=0; /* No nead to use async */
cache_myflags &= ~MY_DONT_CHECK_FILESIZE;
}
else
{
my_off_t file_pos,end_of_file;
if ((file_pos=my_tell(file,MYF(0)) == MY_FILEPOS_ERROR))
DBUG_RETURN(1);
end_of_file=my_seek(file,0L,MY_SEEK_END,MYF(0));
if (end_of_file < seek_offset)
end_of_file=seek_offset;
VOID(my_seek(file,file_pos,MY_SEEK_SET,MYF(0)));
if ((my_off_t) cachesize > end_of_file-seek_offset+IO_SIZE*2-1)
{
cachesize=(uint) (end_of_file-seek_offset)+IO_SIZE*2-1;
use_async_io=0; /* No nead to use async */
}
}
}
@@ -545,7 +555,6 @@ int my_block_write(register IO_CACHE *info, const byte *Buffer, uint Count,
return error;
}
/* Flush write cache */
int flush_io_cache(IO_CACHE *info)
@@ -565,7 +574,9 @@ int flush_io_cache(IO_CACHE *info)
length=(uint) (info->rc_pos - info->buffer);
if (info->seek_not_done)
{ /* File touched, do seek */
VOID(my_seek(info->file,info->pos_in_file,MY_SEEK_SET,MYF(0)));
if (my_seek(info->file,info->pos_in_file,MY_SEEK_SET,MYF(0)) ==
MY_FILEPOS_ERROR)
DBUG_RETURN((info->error= -1));
info->seek_not_done=0;
}
info->rc_pos=info->buffer;