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/* Mach file store backend
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This file is part of the GNU Hurd.
The GNU Hurd 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; either version 2, or (at
your option) any later version.
The GNU Hurd 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <assert.h>
#include "store.h"
static error_t
file_read (struct store *store, off_t addr, mach_msg_type_number_t amount,
char **buf, mach_msg_type_number_t *len)
{
return io_read (store->port, buf, len, addr * store->block_size, amount);
}
static error_t
file_write (struct store *store,
off_t addr, char *buf, mach_msg_type_number_t len,
mach_msg_type_number_t *amount)
{
return io_write (store->port, buf, len, addr * store->block_size, amount);
}
static struct store_meths
file_meths = {dev_read, dev_write};
/* Return a new store in STORE referring to the mach file FILE. Consumes
the send right FILE. */
error_t
store_file_create (file_t file, struct store **store)
{
off_t runs[2];
size_t sizes[DEV_GET_SIZE_COUNT], block_size;
unsigned sizes_len = DEV_GET_SIZE_COUNT;
error_t err = file_get_status (file, DEV_GET_SIZE, sizes, &sizes_len);
if (err)
return err;
assert (sizes_len == DEV_GET_SIZE_COUNT);
block_size = sizes[DEV_GET_SIZE_RECORD_SIZE];
runs[0] = 0;
runs[1] = sizes[DEV_GET_SIZE_FILE_SIZE] / block_size;
return _store_file_create (file, runs, 2, block_size, store);
}
/* Like store_file_create, but doesn't query the file for information. */
error_t
_store_file_create (file_t file,
off_t *runs, unsigned runs_len, size_t block_size,
struct store **store)
{
*store = _make_store (STORAGE_FILE, &file_meths, file, block_size,
runs, runs_len);
return *store ? 0 : ENOMEM;
}
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