grub/kern/fs.c
okuji 39c9d41d2a 2005-07-03 Yoshinori Okuji <okuji@enbug.org>
* DISTLIST: Added genfslist.sh.

	* normal/main.c (fs_module_list): New variable.
	(autoload_fs_module): New function.
	(read_fs_list): Likewise.
	(grub_normal_execute): Call read_fs_list.

	* kern/fs.c (grub_fs_autoload_hook): New variable.
	(grub_fs_probe): Added support for auto-loading.

	* include/grub/normal.h (struct grub_fs_module_list): New struct.
	(grub_fs_module_list_t): New type.

	* include/grub/fs.h (grub_fs_autoload_hook_t): New type.
	(grub_fs_autoload_hook): New prototype.

	* genfslist.sh: New file.

	* genmk.rb: Added a rule to generate a filesystem list.
2005-07-03 18:06:56 +00:00

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/* fs.c - filesystem manager */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2005 Free Software Foundation, Inc.
*
* GRUB 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 of the License, or
* (at your option) any later version.
*
* 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 GRUB; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <grub/disk.h>
#include <grub/net.h>
#include <grub/fs.h>
#include <grub/file.h>
#include <grub/err.h>
#include <grub/misc.h>
#include <grub/types.h>
#include <grub/mm.h>
#include <grub/term.h>
static grub_fs_t grub_fs_list;
grub_fs_autoload_hook_t grub_fs_autoload_hook = 0;
void
grub_fs_register (grub_fs_t fs)
{
fs->next = grub_fs_list;
grub_fs_list = fs;
}
void
grub_fs_unregister (grub_fs_t fs)
{
grub_fs_t *p, q;
for (p = &grub_fs_list, q = *p; q; p = &(q->next), q = q->next)
if (q == fs)
{
*p = q->next;
break;
}
}
void
grub_fs_iterate (int (*hook) (const grub_fs_t fs))
{
grub_fs_t p;
for (p = grub_fs_list; p; p = p->next)
if (hook (p))
break;
}
grub_fs_t
grub_fs_probe (grub_device_t device)
{
grub_fs_t p;
auto int dummy_func (const char *filename, int dir);
int dummy_func (const char *filename __attribute__ ((unused)),
int dir __attribute__ ((unused)))
{
return 1;
}
if (device->disk)
{
/* Make it sure not to have an infinite recursive calls. */
static int count = 0;
for (p = grub_fs_list; p; p = p->next)
{
(p->dir) (device, "/", dummy_func);
if (grub_errno == GRUB_ERR_NONE)
return p;
if (grub_errno != GRUB_ERR_BAD_FS)
return 0;
grub_errno = GRUB_ERR_NONE;
}
/* Let's load modules automatically. */
if (grub_fs_autoload_hook && count == 0)
{
count++;
while (grub_fs_autoload_hook ())
{
p = grub_fs_list;
(p->dir) (device, "/", dummy_func);
if (grub_errno == GRUB_ERR_NONE)
{
count--;
return p;
}
if (grub_errno != GRUB_ERR_BAD_FS)
{
count--;
return 0;
}
grub_errno = GRUB_ERR_NONE;
}
count--;
}
}
else if (device->net->fs)
return device->net->fs;
grub_error (GRUB_ERR_UNKNOWN_FS, "unknown filesystem");
return 0;
}
/* Block list support routines. */
struct grub_fs_block
{
unsigned long offset;
unsigned long length;
};
static grub_err_t
grub_fs_blocklist_open (grub_file_t file, const char *name)
{
char *p = (char *) name;
unsigned num = 0;
unsigned i;
grub_disk_t disk = file->device->disk;
struct grub_fs_block *blocks;
/* First, count the number of blocks. */
do
{
num++;
p = grub_strchr (p, ',');
}
while (p);
/* Allocate a block list. */
blocks = grub_malloc (sizeof (struct grub_fs_block) * (num + 1));
if (! blocks)
return 0;
file->size = 0;
p = (char *) name;
for (i = 0; i < num; i++)
{
if (*p != '+')
{
blocks[i].offset = grub_strtoul (p, &p, 0);
if (grub_errno != GRUB_ERR_NONE || *p != '+')
{
grub_error (GRUB_ERR_BAD_FILENAME,
"invalid file name `%s'", name);
goto fail;
}
}
else
blocks[i].offset = 0;
p++;
blocks[i].length = grub_strtoul (p, &p, 0);
if (grub_errno != GRUB_ERR_NONE
|| blocks[i].length == 0
|| (*p && *p != ',' && ! grub_isspace (*p)))
{
grub_error (GRUB_ERR_BAD_FILENAME,
"invalid file name `%s'", name);
goto fail;
}
if (disk->total_sectors < blocks[i].offset + blocks[i].length)
{
grub_error (GRUB_ERR_BAD_FILENAME, "beyond the total sectors");
goto fail;
}
file->size += (blocks[i].length << GRUB_DISK_SECTOR_BITS);
p++;
}
blocks[i].length = 0;
file->data = blocks;
return GRUB_ERR_NONE;
fail:
grub_free (blocks);
return grub_errno;
}
static grub_ssize_t
grub_fs_blocklist_read (grub_file_t file, char *buf, grub_ssize_t len)
{
struct grub_fs_block *p;
unsigned long sector;
unsigned long offset;
grub_ssize_t ret = 0;
if (len > file->size - file->offset)
len = file->size - file->offset;
sector = (file->offset >> GRUB_DISK_SECTOR_BITS);
offset = (file->offset & (GRUB_DISK_SECTOR_SIZE - 1));
for (p = file->data; p->length && len > 0; p++)
{
if (sector < p->length)
{
grub_ssize_t size;
size = len;
if (((size + offset + GRUB_DISK_SECTOR_SIZE - 1)
>> GRUB_DISK_SECTOR_BITS) > p->length - sector)
size = ((p->length - sector) << GRUB_DISK_SECTOR_BITS) - offset;
if (grub_disk_read (file->device->disk, p->offset + sector, offset,
size, buf) != GRUB_ERR_NONE)
return -1;
ret += size;
len -= size;
sector -= ((size + offset) >> GRUB_DISK_SECTOR_BITS);
offset = ((size + offset) & (GRUB_DISK_SECTOR_SIZE - 1));
}
else
sector -= p->length;
}
return ret;
}
struct grub_fs grub_fs_blocklist =
{
.name = "blocklist",
.dir = 0,
.open = grub_fs_blocklist_open,
.read = grub_fs_blocklist_read,
.close = 0,
.next = 0
};