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rockbox/firmware/common/disk.c
William Wilgus 9daacabd65 [RESTORED!] Allow mounting of any directory as the root directory. 
Provide definitions for the macros:
* RB_ROOT_VOL_HIDDEN(v) to exclude certain items from the root.
* RB_ROOT_CONTENTS to return a string with the name of the
directory to mount in the root.

Defaults are in export/rbpaths.h

It's a bit much for those that don't need the full functionality.
Some conditional define can cut it back a lot to cut out things only
needed if alternate root mounts are required. I'm just not bothering
yet. The basic concept would be applied to all targets to keep file
code from forking too much.

Change-Id: I3b5a14c530ff4b10d97f67636237d96875eb8969
Author: Michael Sevakis
2022-03-03 18:58:07 -05:00

466 lines
12 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Björn Stenberg
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include "config.h"
#include "kernel.h"
#include "storage.h"
#include "debug.h"
#include "disk_cache.h"
#include "fileobj_mgr.h"
#include "dir.h"
#include "rb_namespace.h"
#include "disk.h"
#if defined(HAVE_BOOTDATA) && !defined(SIMULATOR) && !defined(BOOTLOADER)
#include "bootdata.h"
#include "crc32.h"
#endif
#ifndef CONFIG_DEFAULT_PARTNUM
#define CONFIG_DEFAULT_PARTNUM 0
#endif
#define disk_reader_lock() file_internal_lock_READER()
#define disk_reader_unlock() file_internal_unlock_READER()
#define disk_writer_lock() file_internal_lock_WRITER()
#define disk_writer_unlock() file_internal_unlock_WRITER()
/* Partition table entry layout:
-----------------------
0: 0x80 - active
1: starting head
2: starting sector
3: starting cylinder
4: partition type
5: end head
6: end sector
7: end cylinder
8-11: starting sector (LBA)
12-15: nr of sectors in partition
*/
#define BYTES2INT32(array, pos) \
(((uint32_t)array[pos+0] << 0) | \
((uint32_t)array[pos+1] << 8) | \
((uint32_t)array[pos+2] << 16) | \
((uint32_t)array[pos+3] << 24))
#define BYTES2INT16(array, pos) \
(((uint32_t)array[pos+0] << 0) | \
((uint32_t)array[pos+1] << 8))
/* space for 4 partitions on 2 drives */
static struct partinfo part[NUM_DRIVES*4];
/* mounted to which drive (-1 if none) */
static int vol_drive[NUM_VOLUMES];
static int get_free_volume(void)
{
for (int i = 0; i < NUM_VOLUMES; i++)
{
if (vol_drive[i] == -1) /* unassigned? */
return i;
}
return -1; /* none found */
}
#ifdef MAX_LOG_SECTOR_SIZE
static int disk_sector_multiplier[NUM_DRIVES] =
{ [0 ... NUM_DRIVES-1] = 1 };
int disk_get_sector_multiplier(IF_MD_NONVOID(int drive))
{
if (!CHECK_DRV(drive))
return 0;
disk_reader_lock();
int multiplier = disk_sector_multiplier[IF_MD_DRV(drive)];
disk_reader_unlock();
return multiplier;
}
#endif /* MAX_LOG_SECTOR_SIZE */
bool disk_init(IF_MD_NONVOID(int drive))
{
if (!CHECK_DRV(drive))
return false; /* out of space in table */
unsigned char *sector = dc_get_buffer();
if (!sector)
return false;
memset(sector, 0, SECTOR_SIZE);
storage_read_sectors(IF_MD(drive,) 0, 1, sector);
bool init = false;
/* check that the boot sector is initialized */
if (BYTES2INT16(sector, 510) == 0xaa55)
{
/* For each drive, start at a different position, in order not to
destroy the first entry of drive 0. That one is needed to calculate
config sector position. */
struct partinfo *pinfo = &part[IF_MD_DRV(drive)*4];
disk_writer_lock();
/* parse partitions */
for (int i = 0; i < 4; i++)
{
unsigned char* ptr = sector + 0x1be + 16*i;
pinfo[i].type = ptr[4];
pinfo[i].start = BYTES2INT32(ptr, 8);
pinfo[i].size = BYTES2INT32(ptr, 12);
DEBUGF("Part%d: Type %02x, start: %08lx size: %08lx\n",
i,pinfo[i].type,pinfo[i].start,pinfo[i].size);
/* extended? */
if ( pinfo[i].type == 5 )
{
/* not handled yet */
}
}
disk_writer_unlock();
init = true;
}
else
{
DEBUGF("Bad boot sector signature\n");
}
dc_release_buffer(sector);
return init;
}
bool disk_partinfo(int partition, struct partinfo *info)
{
if (partition < 0 || partition >= (int)ARRAYLEN(part) || !info)
return false;
disk_reader_lock();
*info = part[partition];
disk_reader_unlock();
return true;
}
int disk_mount(int drive)
{
int mounted = 0; /* reset partition-on-drive flag */
disk_writer_lock();
int volume = get_free_volume();
if (volume < 0)
{
DEBUGF("No Free Volumes\n");
disk_writer_unlock();
return 0;
}
if (!disk_init(IF_MD(drive)))
{
disk_writer_unlock();
return 0;
}
struct partinfo *pinfo = &part[IF_MD_DRV(drive)*4];
#ifdef MAX_LOG_SECTOR_SIZE
disk_sector_multiplier[IF_MD_DRV(drive)] = 1;
#endif
/* try "superfloppy" mode */
DEBUGF("Trying to mount sector 0.\n");
if (!fat_mount(IF_MV(volume,) IF_MD(drive,) 0))
{
#ifdef MAX_LOG_SECTOR_SIZE
disk_sector_multiplier[drive] =
fat_get_bytes_per_sector(IF_MV(volume)) / SECTOR_SIZE;
#endif
mounted = 1;
vol_drive[volume] = drive; /* remember the drive for this volume */
volume_onmount_internal(IF_MV(volume));
}
if (mounted == 0 && volume != -1) /* not a "superfloppy"? */
{
for (int i = CONFIG_DEFAULT_PARTNUM;
volume != -1 && i < 4 && mounted < NUM_VOLUMES_PER_DRIVE;
i++)
{
if (pinfo[i].type == 0 || pinfo[i].type == 5)
continue; /* skip free/extended partitions */
#ifdef MAX_LOG_SECTOR_SIZE
for (int j = 1; j <= (MAX_LOG_SECTOR_SIZE/SECTOR_SIZE); j <<= 1)
{
if (!fat_mount(IF_MV(volume,) IF_MD(drive,) pinfo[i].start * j))
{
pinfo[i].start *= j;
pinfo[i].size *= j;
mounted++;
vol_drive[volume] = drive; /* remember the drive for this volume */
disk_sector_multiplier[drive] = j;
volume_onmount_internal(IF_MV(volume));
volume = get_free_volume(); /* prepare next entry */
break;
}
}
#else /* ndef MAX_LOG_SECTOR_SIZE */
if (!fat_mount(IF_MV(volume,) IF_MD(drive,) pinfo[i].start))
{
mounted++;
vol_drive[volume] = drive; /* remember the drive for this volume */
volume_onmount_internal(IF_MV(volume));
volume = get_free_volume(); /* prepare next entry */
}
#endif /* MAX_LOG_SECTOR_SIZE */
}
}
disk_writer_unlock();
return mounted;
}
int disk_mount_all(void)
{
int mounted = 0;
disk_writer_lock();
/* reset all mounted partitions */
volume_onunmount_internal(IF_MV(-1));
fat_init();
for (int i = 0; i < NUM_VOLUMES; i++)
vol_drive[i] = -1; /* mark all as unassigned */
#if defined(HAVE_BOOTDATA) && !defined(SIMULATOR) && !defined(BOOTLOADER)
unsigned int crc = 0;
int boot_volume = 0;
crc = crc_32(boot_data.payload, boot_data.length, 0xffffffff);
if(crc == boot_data.crc)
{
boot_volume = boot_data.boot_volume; /* boot volume contained in uint8_t payload */
}
#ifdef HAVE_HOTSWAP
if (storage_present(boot_volume))
#endif
mounted += disk_mount(boot_volume); /* mount boot volume first */
for (int i = 0; i < NUM_DRIVES; i++)
if (i != boot_volume)
#else
for (int i = 0; i < NUM_DRIVES; i++)
#endif
{
#ifdef HAVE_HOTSWAP
if (storage_present(i))
#endif
mounted += disk_mount(i);
}
disk_writer_unlock();
return mounted;
}
int disk_unmount(int drive)
{
if (!CHECK_DRV(drive))
return 0;
int unmounted = 0;
disk_writer_lock();
for (int i = 0; i < NUM_VOLUMES; i++)
{
if (vol_drive[i] == drive)
{ /* force releasing resources */
vol_drive[i] = -1; /* mark unused */
volume_onunmount_internal(IF_MV(i));
fat_unmount(IF_MV(i));
unmounted++;
}
}
disk_writer_unlock();
return unmounted;
}
int disk_unmount_all(void)
{
int unmounted = 0;
disk_writer_lock();
volume_onunmount_internal(IF_MV(-1));
for (int i = 0; i < NUM_DRIVES; i++)
{
#ifdef HAVE_HOTSWAP
if (storage_present(i))
#endif
unmounted += disk_unmount(i);
}
disk_writer_unlock();
return unmounted;
}
bool disk_present(IF_MD_NONVOID(int drive))
{
int rc = -1;
if (CHECK_DRV(drive))
{
void *sector = dc_get_buffer();
if (sector)
{
rc = storage_read_sectors(IF_MD(drive,) 0, 1, sector);
dc_release_buffer(sector);
}
}
return rc == 0;
}
/** Volume-centric functions **/
void volume_recalc_free(IF_MV_NONVOID(int volume))
{
if (!CHECK_VOL(volume))
return;
/* FIXME: this is crummy but the only way to ensure a correct freecount
if other threads are writing and changing the fsinfo; it is possible
to get multiple threads calling here and also writing and get correct
freespace counts, however a bit complicated to do; if thou desireth I
shall implement the concurrent version -- jethead71 */
disk_writer_lock();
fat_recalc_free(IF_MV(volume));
disk_writer_unlock();
}
unsigned int volume_get_cluster_size(IF_MV_NONVOID(int volume))
{
if (!CHECK_VOL(volume))
return 0;
disk_reader_lock();
unsigned int clustersize = fat_get_cluster_size(IF_MV(volume));
disk_reader_unlock();
return clustersize;
}
void volume_size(IF_MV(int volume,) unsigned long *sizep, unsigned long *freep)
{
disk_reader_lock();
if (!CHECK_VOL(volume) || !fat_size(IF_MV(volume,) sizep, freep))
{
if (freep) *sizep = 0;
if (freep) *freep = 0;
}
disk_reader_unlock();
}
#if defined (HAVE_HOTSWAP) || defined (HAVE_MULTIDRIVE) \
|| defined (HAVE_DIRCACHE)
enum volume_info_type
{
#ifdef HAVE_HOTSWAP
VP_REMOVABLE,
VP_PRESENT,
#endif
#if defined (HAVE_MULTIDRIVE) || defined (HAVE_DIRCACHE)
VP_DRIVE,
#endif
};
static int volume_properties(int volume, enum volume_info_type infotype)
{
int res = -1;
disk_reader_lock();
if (CHECK_VOL(volume))
{
int vd = vol_drive[volume];
switch (infotype)
{
#ifdef HAVE_HOTSWAP
case VP_REMOVABLE:
res = storage_removable(vd) ? 1 : 0;
break;
case VP_PRESENT:
res = storage_present(vd) ? 1 : 0;
break;
#endif
#if defined(HAVE_MULTIDRIVE) || defined(HAVE_DIRCACHE)
case VP_DRIVE:
res = vd;
break;
#endif
}
}
disk_reader_unlock();
return res;
}
#ifdef HAVE_HOTSWAP
bool volume_removable(int volume)
{
return volume_properties(volume, VP_REMOVABLE) > 0;
}
bool volume_present(int volume)
{
return volume_properties(volume, VP_PRESENT) > 0;
}
#endif /* HAVE_HOTSWAP */
#ifdef HAVE_MULTIDRIVE
int volume_drive(int volume)
{
return volume_properties(volume, VP_DRIVE);
}
#endif /* HAVE_MULTIDRIVE */
#ifdef HAVE_DIRCACHE
bool volume_ismounted(IF_MV_NONVOID(int volume))
{
return volume_properties(IF_MV_VOL(volume), VP_DRIVE) >= 0;
}
#endif /* HAVE_DIRCACHE */
#endif /* HAVE_HOTSWAP || HAVE_MULTIDRIVE || HAVE_DIRCACHE */
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