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fs: add filesystem switch libary, implement ls and fsload commands

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Implement "ls" and "fsload" commands that act like {fat,ext2}{ls,load},
and transparently handle either file-system. This scheme could easily be
extended to other filesystem types; I only didn't do it for zfs because
I don't have any filesystems of that type to test with.

Replace the implementation of {fat,ext[24]}{ls,load} with this new code
too.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Stephen Warren 2012-10-22 06:43:51 +00:00 committed by Tom Rini
parent 03e2ecf6b8
commit 045fa1e114
11 changed files with 483 additions and 298 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
Makefile
View file

@ -260,7 +260,8 @@ LIBS-y += drivers/net/npe/libnpe.o
endif
LIBS-$(CONFIG_OF_EMBED) += dts/libdts.o
LIBS-y += arch/$(ARCH)/lib/lib$(ARCH).o
LIBS-y += fs/cbfs/libcbfs.o \
LIBS-y += fs/libfs.o \
fs/cbfs/libcbfs.o \
fs/cramfs/libcramfs.o \
fs/ext4/libext4fs.o \
fs/fat/libfat.o \

6
common/Makefile
View file

@ -90,11 +90,6 @@ COBJS-$(CONFIG_CMD_ELF) += cmd_elf.o
COBJS-$(CONFIG_SYS_HUSH_PARSER) += cmd_exit.o
COBJS-$(CONFIG_CMD_EXT4) += cmd_ext4.o
COBJS-$(CONFIG_CMD_EXT2) += cmd_ext2.o
ifdef CONFIG_CMD_EXT4
COBJS-y += cmd_ext_common.o
else
COBJS-$(CONFIG_CMD_EXT2) += cmd_ext_common.o
endif
COBJS-$(CONFIG_CMD_FAT) += cmd_fat.o
COBJS-$(CONFIG_CMD_FDC)$(CONFIG_CMD_FDOS) += cmd_fdc.o
COBJS-$(CONFIG_OF_LIBFDT) += cmd_fdt.o fdt_support.o
@ -104,6 +99,7 @@ COBJS-$(CONFIG_CMD_FLASH) += cmd_flash.o
ifdef CONFIG_FPGA
COBJS-$(CONFIG_CMD_FPGA) += cmd_fpga.o
endif
COBJS-$(CONFIG_CMD_FS_GENERIC) += cmd_fs.o
COBJS-$(CONFIG_CMD_GPIO) += cmd_gpio.o
COBJS-$(CONFIG_CMD_I2C) += cmd_i2c.o
COBJS-$(CONFIG_CMD_IDE) += cmd_ide.o

13
common/cmd_ext2.c
View file

@ -37,15 +37,11 @@
/*
* Ext2fs support
*/
#include <common.h>
#include <ext_common.h>
#include <fs.h>
int do_ext2ls (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
if (do_ext_ls(cmdtp, flag, argc, argv))
return -1;
return 0;
return do_ls(cmdtp, flag, argc, argv, FS_TYPE_EXT);
}
/******************************************************************************
@ -53,10 +49,7 @@ int do_ext2ls (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
*/
int do_ext2load (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
if (do_ext_load(cmdtp, flag, argc, argv))
return -1;
return 0;
return do_fsload(cmdtp, flag, argc, argv, FS_TYPE_EXT);
}
U_BOOT_CMD(

12
common/cmd_ext4.c
View file

@ -47,10 +47,10 @@
#include <image.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include <ext_common.h>
#include <ext4fs.h>
#include <linux/stat.h>
#include <malloc.h>
#include <fs.h>
#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
#include <usb.h>
@ -59,18 +59,12 @@
int do_ext4_load(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
if (do_ext_load(cmdtp, flag, argc, argv))
return -1;
return 0;
return do_fsload(cmdtp, flag, argc, argv, FS_TYPE_EXT);
}
int do_ext4_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
if (do_ext_ls(cmdtp, flag, argc, argv))
return -1;
return 0;
return do_ls(cmdtp, flag, argc, argv, FS_TYPE_EXT);
}
#if defined(CONFIG_CMD_EXT4_WRITE)

197
common/cmd_ext_common.c
View file

@ -1,197 +0,0 @@
/*
* (C) Copyright 2011 - 2012 Samsung Electronics
* EXT2/4 filesystem implementation in Uboot by
* Uma Shankar <uma.shankar@samsung.com>
* Manjunatha C Achar <a.manjunatha@samsung.com>
*
* Ext4fs support
* made from existing cmd_ext2.c file of Uboot
*
* (C) Copyright 2004
* esd gmbh <www.esd-electronics.com>
* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
*
* made from cmd_reiserfs by
*
* (C) Copyright 2003 - 2004
* Sysgo Real-Time Solutions, AG <www.elinos.com>
* Pavel Bartusek <pba@sysgo.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
*
*/
/*
* Changelog:
* 0.1 - Newly created file for ext4fs support. Taken from cmd_ext2.c
* file in uboot. Added ext4fs ls load and write support.
*/
#include <common.h>
#include <part.h>
#include <config.h>
#include <command.h>
#include <image.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include <ext_common.h>
#include <ext4fs.h>
#include <linux/stat.h>
#include <malloc.h>
#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
#include <usb.h>
#endif
#if !defined(CONFIG_DOS_PARTITION) && !defined(CONFIG_EFI_PARTITION)
#error DOS or EFI partition support must be selected
#endif
#define DOS_PART_MAGIC_OFFSET 0x1fe
#define DOS_FS_TYPE_OFFSET 0x36
#define DOS_FS32_TYPE_OFFSET 0x52
int do_ext_load(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
char *filename = NULL;
int dev, part;
ulong addr = 0;
int filelen;
disk_partition_t info;
block_dev_desc_t *dev_desc;
char buf[12];
unsigned long count;
const char *addr_str;
count = 0;
addr = simple_strtoul(argv[3], NULL, 16);
filename = getenv("bootfile");
switch (argc) {
case 3:
addr_str = getenv("loadaddr");
if (addr_str != NULL)
addr = simple_strtoul(addr_str, NULL, 16);
else
addr = CONFIG_SYS_LOAD_ADDR;
break;
case 4:
break;
case 5:
filename = argv[4];
break;
case 6:
filename = argv[4];
count = simple_strtoul(argv[5], NULL, 16);
break;
default:
return cmd_usage(cmdtp);
}
if (!filename) {
puts("** No boot file defined **\n");
return 1;
}
part = get_device_and_partition(argv[1], argv[2], &dev_desc, &info, 1);
if (part < 0)
return 1;
dev = dev_desc->dev;
printf("Loading file \"%s\" from %s device %d%c%c\n",
filename, argv[1], dev,
part ? ':' : ' ', part ? part + '0' : ' ');
ext4fs_set_blk_dev(dev_desc, &info);
if (!ext4fs_mount(info.size)) {
printf("** Bad ext2 partition or disk - %s %d:%d **\n",
argv[1], dev, part);
ext4fs_close();
goto fail;
}
filelen = ext4fs_open(filename);
if (filelen < 0) {
printf("** File not found %s\n", filename);
ext4fs_close();
goto fail;
}
if ((count < filelen) && (count != 0))
filelen = count;
if (ext4fs_read((char *)addr, filelen) != filelen) {
printf("** Unable to read \"%s\" from %s %d:%d **\n",
filename, argv[1], dev, part);
ext4fs_close();
goto fail;
}
ext4fs_close();
/* Loading ok, update default load address */
load_addr = addr;
printf("%d bytes read\n", filelen);
sprintf(buf, "%X", filelen);
setenv("filesize", buf);
return 0;
fail:
return 1;
}
int do_ext_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
const char *filename = "/";
int dev;
int part;
block_dev_desc_t *dev_desc;
disk_partition_t info;
if (argc < 2)
return cmd_usage(cmdtp);
part = get_device_and_partition(argv[1], argv[2], &dev_desc, &info, 1);
if (part < 0)
return 1;
if (argc == 4)
filename = argv[3];
dev = dev_desc->dev;
ext4fs_set_blk_dev(dev_desc, &info);
if (!ext4fs_mount(info.size)) {
printf("** Bad ext2 partition or disk - %s %d:%d **\n",
argv[1], dev, part);
ext4fs_close();
goto fail;
}
if (ext4fs_ls(filename)) {
printf("** Error extfs_ls() **\n");
ext4fs_close();
goto fail;
};
ext4fs_close();
return 0;
fail:
return 1;
}

76
common/cmd_fat.c
View file

@ -31,54 +31,11 @@
#include <ata.h>
#include <part.h>
#include <fat.h>
#include <fs.h>
int do_fat_fsload (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
long size;
unsigned long offset;
unsigned long count = 0;
unsigned long pos = 0;
char buf [12];
block_dev_desc_t *dev_desc=NULL;
disk_partition_t info;
int part, dev;
if (argc < 5) {
printf("usage: fatload <interface> [<dev[:part]>] "
"<addr> <filename> [bytes [pos]]\n");
return 1;
}
part = get_device_and_partition(argv[1], argv[2], &dev_desc, &info, 1);
if (part < 0)
return 1;
dev = dev_desc->dev;
if (fat_set_blk_dev(dev_desc, &info) != 0) {
printf("\n** Unable to use %s %d:%d for fatload **\n",
argv[1], dev, part);
return 1;
}
offset = simple_strtoul(argv[3], NULL, 16);
if (argc >= 6)
count = simple_strtoul(argv[5], NULL, 16);
if (argc >= 7)
pos = simple_strtoul(argv[6], NULL, 16);
size = file_fat_read_at(argv[4], pos, (unsigned char *)offset, count);
if(size==-1) {
printf("\n** Unable to read \"%s\" from %s %d:%d **\n",
argv[4], argv[1], dev, part);
return 1;
}
printf("\n%ld bytes read\n", size);
sprintf(buf, "%lX", size);
setenv("filesize", buf);
return 0;
return do_fsload(cmdtp, flag, argc, argv, FS_TYPE_FAT);
}
@ -96,34 +53,7 @@ U_BOOT_CMD(
int do_fat_ls (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
char *filename = "/";
int ret, dev, part;
block_dev_desc_t *dev_desc=NULL;
disk_partition_t info;
if (argc < 2) {
printf("usage: fatls <interface> [<dev[:part]>] [directory]\n");
return 0;
}
part = get_device_and_partition(argv[1], argv[2], &dev_desc, &info, 1);
if (part < 0)
return 1;
dev = dev_desc->dev;
if (fat_set_blk_dev(dev_desc, &info) != 0) {
printf("\n** Unable to use %s %d:%d for fatls **\n",
argv[1], dev, part);
return 1;
}
if (argc == 4)
ret = file_fat_ls(argv[3]);
else
ret = file_fat_ls(filename);
if(ret!=0)
printf("No Fat FS detected\n");
return ret;
return do_ls(cmdtp, flag, argc, argv, FS_TYPE_FAT);
}
U_BOOT_CMD(

51
common/cmd_fs.c Normal file
View file

@ -0,0 +1,51 @@
/*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
*
* Inspired by cmd_ext_common.c, cmd_fat.c.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <command.h>
#include <fs.h>
int do_fsload_wrapper(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
return do_fsload(cmdtp, flag, argc, argv, FS_TYPE_ANY);
}
U_BOOT_CMD(
fsload, 7, 0, do_fsload_wrapper,
"load binary file from a filesystem",
"<interface> [<dev[:part]> [<addr> [<filename> [bytes [pos]]]]]\n"
" - Load binary file 'filename' from partition 'part' on device\n"
" type 'interface' instance 'dev' to address 'addr' in memory.\n"
" 'bytes' gives the size to load in bytes.\n"
" If 'bytes' is 0 or omitted, the file is read until the end.\n"
" 'pos' gives the file byte position to start reading from.\n"
" If 'pos' is 0 or omitted, the file is read from the start."
);
int do_ls_wrapper(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
return do_ls(cmdtp, flag, argc, argv, FS_TYPE_ANY);
}
U_BOOT_CMD(
ls, 4, 1, do_ls_wrapper,
"list files in a directory (default /)",
"<interface> [<dev[:part]> [directory]]\n"
" - List files in directory 'directory' of partition 'part' on\n"
" device type 'interface' instance 'dev'."
);

47
fs/Makefile Normal file
View file

@ -0,0 +1,47 @@
#
# (C) Copyright 2000-2006
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
# Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
#
# See file CREDITS for list of people who contributed to this
# project.
#
# 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 $(TOPDIR)/config.mk
LIB = $(obj)libfs.o
COBJS-y += fs.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
all: $(LIB)
$(LIB): $(obj).depend $(OBJS)
$(call cmd_link_o_target, $(OBJS))
#########################################################################
# defines $(obj).depend target
include $(SRCTREE)/rules.mk
sinclude $(obj).depend
#########################################################################

308
fs/fs.c Normal file
View file

@ -0,0 +1,308 @@
/*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <common.h>
#include <part.h>
#include <ext4fs.h>
#include <fat.h>
#include <fs.h>
static block_dev_desc_t *fs_dev_desc;
static disk_partition_t fs_partition;
static int fs_type = FS_TYPE_ANY;
static inline int fs_ls_unsupported(const char *dirname)
{
printf("** Unrecognized filesystem type **\n");
return -1;
}
static inline int fs_read_unsupported(const char *filename, ulong addr,
int offset, int len)
{
printf("** Unrecognized filesystem type **\n");
return -1;
}
#ifdef CONFIG_FS_FAT
static int fs_probe_fat(void)
{
return fat_set_blk_dev(fs_dev_desc, &fs_partition);
}
static void fs_close_fat(void)
{
}
#define fs_ls_fat file_fat_ls
static int fs_read_fat(const char *filename, ulong addr, int offset, int len)
{
int len_read;
len_read = file_fat_read_at(filename, offset,
(unsigned char *)addr, len);
if (len_read == -1) {
printf("** Unable to read file %s **\n", filename);
return -1;
}
return len_read;
}
#else
static inline int fs_probe_fat(void)
{
return -1;
}
static inline void fs_close_fat(void)
{
}
#define fs_ls_fat fs_ls_unsupported
#define fs_read_fat fs_read_unsupported
#endif
#ifdef CONFIG_FS_EXT4
static int fs_probe_ext(void)
{
ext4fs_set_blk_dev(fs_dev_desc, &fs_partition);
if (!ext4fs_mount(fs_partition.size)) {
ext4fs_close();
return -1;
}
return 0;
}
static void fs_close_ext(void)
{
ext4fs_close();
}
#define fs_ls_ext ext4fs_ls
static int fs_read_ext(const char *filename, ulong addr, int offset, int len)
{
int file_len;
int len_read;
if (offset != 0) {
printf("** Cannot support non-zero offset **\n");
return -1;
}
file_len = ext4fs_open(filename);
if (file_len < 0) {
printf("** File not found %s **\n", filename);
ext4fs_close();
return -1;
}
if (len == 0)
len = file_len;
len_read = ext4fs_read((char *)addr, len);
ext4fs_close();
if (len_read != len) {
printf("** Unable to read file %s **\n", filename);
return -1;
}
return len_read;
}
#else
static inline int fs_probe_ext(void)
{
return -1;
}
static inline void fs_close_ext(void)
{
}
#define fs_ls_ext fs_ls_unsupported
#define fs_read_ext fs_read_unsupported
#endif
static const struct {
int fstype;
int (*probe)(void);
} fstypes[] = {
{
.fstype = FS_TYPE_FAT,
.probe = fs_probe_fat,
},
{
.fstype = FS_TYPE_EXT,
.probe = fs_probe_ext,
},
};
int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype)
{
int part, i;
part = get_device_and_partition(ifname, dev_part_str, &fs_dev_desc,
&fs_partition, 1);
if (part < 0)
return -1;
for (i = 0; i < ARRAY_SIZE(fstypes); i++) {
if ((fstype != FS_TYPE_ANY) && (fstype != fstypes[i].fstype))
continue;
if (!fstypes[i].probe()) {
fs_type = fstypes[i].fstype;
return 0;
}
}
printf("** Unrecognized filesystem type **\n");
return -1;
}
static void fs_close(void)
{
switch (fs_type) {
case FS_TYPE_FAT:
fs_close_fat();
break;
case FS_TYPE_EXT:
fs_close_ext();
break;
default:
break;
}
fs_type = FS_TYPE_ANY;
}
int fs_ls(const char *dirname)
{
int ret;
switch (fs_type) {
case FS_TYPE_FAT:
ret = fs_ls_fat(dirname);
break;
case FS_TYPE_EXT:
ret = fs_ls_ext(dirname);
break;
default:
ret = fs_ls_unsupported(dirname);
break;
}
fs_close();
return ret;
}
int fs_read(const char *filename, ulong addr, int offset, int len)
{
int ret;
switch (fs_type) {
case FS_TYPE_FAT:
ret = fs_read_fat(filename, addr, offset, len);
break;
case FS_TYPE_EXT:
ret = fs_read_ext(filename, addr, offset, len);
break;
default:
ret = fs_read_unsupported(filename, addr, offset, len);
break;
}
fs_close();
return ret;
}
int do_fsload(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int fstype)
{
unsigned long addr;
const char *addr_str;
const char *filename;
unsigned long bytes;
unsigned long pos;
int len_read;
char buf[12];
if (argc < 5)
return CMD_RET_USAGE;
if (fs_set_blk_dev(argv[1], argv[2], fstype))
return 1;
if (argc >= 4) {
addr = simple_strtoul(argv[3], NULL, 0);
} else {
addr_str = getenv("loadaddr");
if (addr_str != NULL)
addr = simple_strtoul(addr_str, NULL, 16);
else
addr = CONFIG_SYS_LOAD_ADDR;
}
if (argc >= 5) {
filename = argv[4];
} else {
filename = getenv("bootfile");
if (!filename) {
puts("** No boot file defined **\n");
return 1;
}
}
if (argc >= 6)
bytes = simple_strtoul(argv[5], NULL, 0);
else
bytes = 0;
if (argc >= 7)
pos = simple_strtoul(argv[6], NULL, 0);
else
pos = 0;
len_read = fs_read(filename, addr, pos, bytes);
if (len_read <= 0)
return 1;
printf("%d bytes read\n", len_read);
sprintf(buf, "0x%x", len_read);
setenv("filesize", buf);
return 0;
}
int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int fstype)
{
if (argc < 2)
return CMD_RET_USAGE;
if (fs_set_blk_dev(argv[1], (argc >= 3) ? argv[2] : NULL, fstype))
return 1;
if (fs_ls(argc == 4 ? argv[3] : "/"))
return 1;
return 0;
}

3
include/ext_common.h
View file

@ -195,7 +195,4 @@ int do_ext4_load(cmd_tbl_t *cmdtp, int flag, int argc,
int do_ext4_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]);
int do_ext4_write(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[]);
int do_ext_load(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[]);
int do_ext_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]);
#endif

65
include/fs.h Normal file
View file

@ -0,0 +1,65 @@
/*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _FS_H
#define _FS_H
#include <common.h>
#define FS_TYPE_ANY 0
#define FS_TYPE_FAT 1
#define FS_TYPE_EXT 2
/*
* Tell the fs layer which block device an partition to use for future
* commands. This also internally identifies the filesystem that is present
* within the partition. The identification process may be limited to a
* specific filesystem type by passing FS_* in the fstype parameter.
*
* Returns 0 on success.
* Returns non-zero if there is an error accessing the disk or partition, or
* no known filesystem type could be recognized on it.
*/
int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype);
/*
* Print the list of files on the partition previously set by fs_set_blk_dev(),
* in directory "dirname".
*
* Returns 0 on success. Returns non-zero on error.
*/
int fs_ls(const char *dirname);
/*
* Read file "filename" from the partition previously set by fs_set_blk_dev(),
* to address "addr", starting at byte offset "offset", and reading "len"
* bytes. "offset" may be 0 to read from the start of the file. "len" may be
* 0 to read the entire file. Note that not all filesystem types support
* either/both offset!=0 or len!=0.
*
* Returns number of bytes read on success. Returns <= 0 on error.
*/
int fs_read(const char *filename, ulong addr, int offset, int len);
/*
* Common implementation for various filesystem commands, optionally limited
* to a specific filesystem type via the fstype parameter.
*/
int do_fsload(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int fstype);
int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int fstype);
#endif /* _FS_H */