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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 <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <hurd.h>
#include <hurd/io.h>
#include "store.h"
static error_t
file_read (struct store *store,
off_t addr, size_t index, size_t amount, void **buf, size_t *len)
{
size_t bsize = store->block_size;
error_t err = io_read (store->port, (char **)buf, len, addr * bsize, amount);
#if 0
char rep_buf[20];
if (err)
strcpy (rep_buf, "-");
else if (*len > sizeof rep_buf - 3)
sprintf (rep_buf, "\"%.*s\"...", (int)(sizeof rep_buf - 6), *buf);
else
sprintf (rep_buf, "\"%.*s\"", (int)(sizeof rep_buf - 3), *buf);
fprintf (stderr, "; file_read (%ld, %d, %d) [%d] => %s, %s, %d\n",
addr, index, amount, store->block_size, err ? strerror (err) : "-",
rep_buf, err ? 0 : *len);
#endif
return err;
}
static error_t
file_write (struct store *store,
off_t addr, size_t index, void *buf, size_t len, size_t *amount)
{
size_t bsize = store->block_size;
#if 0
char rep_buf[20];
if (len > sizeof rep_buf - 3)
sprintf (rep_buf, "\"%.*s\"...", (int)(sizeof rep_buf - 6), buf);
else
sprintf (rep_buf, "\"%.*s\"", (int)(sizeof rep_buf - 3), buf);
fprintf (stderr, "; file_write (%ld, %d, %s, %d)\n",
addr, index, rep_buf, len);
#endif
return io_write (store->port, buf, len, addr * bsize, amount);
}
static error_t
file_decode (struct store_enc *enc, const struct store_class *const *classes,
struct store **store)
{
return store_std_leaf_decode (enc, _store_file_create, store);
}
static error_t
file_open (const char *name, int flags,
const struct store_class *const *classes,
struct store **store)
{
return store_file_open (name, flags, store);
}
struct store_class
store_file_class =
{
STORAGE_HURD_FILE, "file", file_read, file_write,
store_std_leaf_allocate_encoding, store_std_leaf_encode, file_decode,
0, 0, 0, 0, 0, file_open
};
static error_t
file_byte_read (struct store *store,
off_t addr, size_t index, size_t amount,
void **buf, size_t *len)
{
error_t err = io_read (store->port, (char **)buf, len, addr, amount);
#if 0
char rep_buf[20];
if (err)
strcpy (rep_buf, "-");
else if (*len > sizeof rep_buf - 3)
sprintf (rep_buf, "\"%.*s\"...", (int)(sizeof rep_buf - 6), *buf);
else
sprintf (rep_buf, "\"%.*s\"", (int)(sizeof rep_buf - 3), *buf);
fprintf (stderr, "; file_byte_read (%ld, %d, %d) => %s, %s, %d\n",
addr, index, amount, err ? strerror (err) : "-",
rep_buf, err ? 0 : *len);
#endif
return err;
}
static error_t
file_byte_write (struct store *store,
off_t addr, size_t index, void *buf, size_t len,
size_t *amount)
{
#if 0
char rep_buf[20];
if (len > sizeof rep_buf - 3)
sprintf (rep_buf, "\"%.*s\"...", (int)(sizeof rep_buf - 6), buf);
else
sprintf (rep_buf, "\"%.*s\"", (int)(sizeof rep_buf - 3), buf);
fprintf (stderr, "; file_byte_write (%ld, %d, %s, %d)\n",
addr, index, rep_buf, len);
#endif
return io_write (store->port, buf, len, addr, amount);
}
struct store_class
store_file_byte_class = {STORAGE_HURD_FILE, "file", file_byte_read, file_byte_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, int flags, struct store **store)
{
struct store_run run;
struct stat stat;
error_t err = io_stat (file, &stat);
if (err)
return err;
run.start = 0;
run.length = stat.st_size;
flags |= STORE_ENFORCED; /* 'cause it's the whole file. */
return _store_file_create (file, flags, 1, &run, 1, store);
}
/* Like store_file_create, but doesn't query the file for information. */
error_t
_store_file_create (file_t file, int flags, size_t block_size,
const struct store_run *runs, size_t num_runs,
struct store **store)
{
if (block_size == 1)
*store = _make_store (&store_file_byte_class,
file, flags, 1, runs, num_runs, 0);
else if ((block_size & (block_size - 1)) == 0)
*store =
_make_store (&store_file_class,
file, flags, block_size, runs, num_runs, 0);
else
return EINVAL; /* block size not a power of two */
return *store ? 0 : ENOMEM;
}
/* Open the file NAME, and return the corresponding store in STORE. */
error_t
store_file_open (const char *name, int flags, struct store **store)
{
error_t err;
int open_flags = (flags & STORE_HARD_READONLY) ? O_RDONLY : O_RDWR;
file_t node = file_name_lookup (name, open_flags, 0);
if (node == MACH_PORT_NULL)
return errno;
err = store_file_create (node, flags, store);
if (err)
mach_port_deallocate (mach_task_self (), node);
return err;
}
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