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/*
* Copyright (C) 2013 Raphael S. Carvalho <raphael.scarv@gmail.com>
* Copyright (C) 2015 Paulo Alcantara <pcacjr@zytor.com>
*
* 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; 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 this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <assert.h>
#include <fs.h>
#include <ilog2.h>
#include <disk.h>
#include <cache.h>
#include <minmax.h>
#include "multifs.h"
#define DISKS_MAX 0x7f
struct part_node {
int partition;
struct fs_info *fs;
struct part_node *next;
};
struct queue_head {
struct part_node *first;
struct part_node *last;
};
static struct queue_head *parts_info[DISKS_MAX];
static int add_fs(struct fs_info *fs, uint8_t diskno, uint8_t partno)
{
struct queue_head *head = parts_info[diskno];
struct part_node *node;
node = malloc(sizeof(struct part_node));
if (!node)
return -1;
node->fs = fs;
node->next = NULL;
node->partition = partno;
if (!head) {
head = malloc(sizeof(struct queue_head));
if (!head) {
free(node);
return -1;
}
head->first = head->last = node;
parts_info[diskno] = head;
return 0;
}
head->last->next = node;
head->last = node;
return 0;
}
struct fs_info *multifs_get_fs(uint8_t diskno, uint8_t partno)
{
struct part_node *i;
for (i = parts_info[diskno]->first; i; i = i->next) {
if (i->partition == partno)
return i->fs;
}
return NULL;
}
static const char *get_num(const char *p, char delimiter, uint8_t *data)
{
uint32_t n = 0;
while (*p) {
if (*p < '0' || *p > '9')
break;
n = (n * 10) + (*p - '0');
p++;
if (*p == delimiter) {
p++; /* skip delimiter */
*data = min(n, UINT8_MAX); /* avoid overflow */
return p;
}
}
return NULL;
}
int multifs_parse_path(const char **path, uint8_t *diskno, uint8_t *partno)
{
const char *p = *path;
static const char *cwd = ".";
*diskno = *partno = 0;
p++; /* Skip open parentheses */
/* Get hd number (Range: 0 - (DISKS_MAX - 1)) */
if (*p != 'h' || *(p + 1) != 'd')
return -1;
p += 2; /* Skip 'h' and 'd' */
p = get_num(p, ',', diskno);
if (!p)
return -1;
if (*diskno >= DISKS_MAX) {
printf("MultiFS: disk number is out of range: 0-%d\n", DISKS_MAX - 1);
return -1;
}
/* Get partition number (Range: 0 - 0xFF) */
p = get_num(p, ')', partno);
if (!p)
return -1;
if (*p == '\0') {
/* Assume it's a cwd request */
p = cwd;
}
*path = p;
dprintf("MultiFS: disk: %u partition: %u path: %s\n", *diskno, *partno,
*path);
return 0;
}
int multifs_setup_fs_info(struct fs_info *fsp, uint8_t diskno, uint8_t partno,
void *priv)
{
const struct fs_ops **ops;
int blk_shift = -1;
struct device *dev = NULL;
/* set default name for the root directory */
fsp->cwd_name[0] = '/';
fsp->cwd_name[1] = '\0';
ops = p_ops;
while ((blk_shift < 0) && *ops) {
/* set up the fs stucture */
fsp->fs_ops = *ops;
/*
* This boldly assumes that we don't mix FS_NODEV filesystems
* with FS_DEV filesystems...
*/
if (fsp->fs_ops->fs_flags & FS_NODEV) {
fsp->fs_dev = NULL;
} else {
if (!dev) {
dev = device_init(priv);
if (!dev)
return -1;
}
fsp->fs_dev = dev;
}
/* invoke the fs-specific init code */
blk_shift = fsp->fs_ops->fs_init(fsp);
ops++;
}
if (blk_shift < 0) {
dprintf("%s: no valid file system found!\n", __func__);
goto out_free;
}
if (add_fs(fsp, diskno, partno - 1))
goto out_free;
if (fsp->fs_dev && fsp->fs_dev->cache_data)
cache_init(fsp->fs_dev, blk_shift);
if (fsp->fs_ops->iget_root) {
fsp->root = fsp->fs_ops->iget_root(fsp);
fsp->cwd = get_inode(fsp->root);
}
return 0;
out_free:
free(dev->disk);
free(dev->cache_data);
free(dev);
return -1;
}
void multifs_restore_fs(void)
{
this_fs = root_fs;
}
int multifs_switch_fs(const char **path)
{
struct fs_info *fs;
assert(path && *path);
if ((*path)[0] != '(') {
/* If so, don't need to restore chdir */
if (this_fs == root_fs)
return 0;
fs = root_fs;
goto ret;
}
fs = multifs_ops->get_fs_info(path);
if (!fs)
return -1;
ret:
this_fs = fs;
return 0;
}
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