[U-Boot] [PATCH] sandbox: block driver using host file/device as backing store
Henrik Nordström
henrik at henriknordstrom.net
Wed May 15 01:36:51 CEST 2013
A simple "host" block driver using any host file/device
as backing store.
The mapping is established using the "sb bind" command
Signed-off-by: Henrik Nordstrom <henrik at henriknordstrom.net>
---
common/cmd_sandbox.c | 10 +++-
disk/part.c | 20 ++-----
drivers/block/Makefile | 1 +
drivers/block/sandbox.c | 130 +++++++++++++++++++++++++++++++++++++++++++++
include/config_fallbacks.h | 3 +-
include/configs/sandbox.h | 2 +
include/part.h | 3 ++
7 files changed, 150 insertions(+), 19 deletions(-)
create mode 100644 drivers/block/sandbox.c
diff --git a/common/cmd_sandbox.c b/common/cmd_sandbox.c
index 206a486..492d569 100644
--- a/common/cmd_sandbox.c
+++ b/common/cmd_sandbox.c
@@ -32,9 +32,16 @@ static int do_sandbox_ls(cmd_tbl_t *cmdtp, int flag, int argc,
return do_ls(cmdtp, flag, argc, argv, FS_TYPE_SANDBOX);
}
+static int do_sandbox_bind(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ return host_dev_bind(atoi(argv[1]), argv[2]);
+}
+
static cmd_tbl_t cmd_sandbox_sub[] = {
U_BOOT_CMD_MKENT(load, 3, 0, do_sandbox_load, "", ""),
U_BOOT_CMD_MKENT(ls, 3, 0, do_sandbox_ls, "", ""),
+ U_BOOT_CMD_MKENT(bind, 3, 0, do_sandbox_bind, "", ""),
};
static int do_sandbox(cmd_tbl_t *cmdtp, int flag, int argc,
@@ -59,5 +66,6 @@ U_BOOT_CMD(
sb, 6, 1, do_sandbox,
"Miscellaneous sandbox commands",
"load host <addr> <filename> [<bytes> <offset>] - load a file from host\n"
- "sb ls host <filename> - save a file to host"
+ "ls host <filename> - save a file to host\n"
+ "bind dev <filename> - bind \"host\" device to file"
);
diff --git a/disk/part.c b/disk/part.c
index d73625c..648839b 100644
--- a/disk/part.c
+++ b/disk/part.c
@@ -59,6 +59,9 @@ static const struct block_drvr block_drvr[] = {
#if defined(CONFIG_SYSTEMACE)
{ .name = "ace", .get_dev = systemace_get_dev, },
#endif
+#if defined(CONFIG_SANDBOX)
+ { .name = "host", .get_dev = host_get_dev, },
+#endif
{ },
};
@@ -462,23 +465,6 @@ int get_device_and_partition(const char *ifname, const char *dev_part_str,
int part;
disk_partition_t tmpinfo;
- /*
- * For now, we have a special case for sandbox, since there is no
- * real block device support.
- */
- if (0 == strcmp(ifname, "host")) {
- *dev_desc = NULL;
- info->start = info->size = info->blksz = 0;
- info->bootable = 0;
- strcpy((char *)info->type, BOOT_PART_TYPE);
- strcpy((char *)info->name, "Sandbox host");
-#ifdef CONFIG_PARTITION_UUIDS
- info->uuid[0] = 0;
-#endif
-
- return 0;
- }
-
/* If no dev_part_str, use bootdevice environment variable */
if (!dev_part_str || !strlen(dev_part_str) ||
!strcmp(dev_part_str, "-"))
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index f1ebdcc..2d2fb55 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -40,6 +40,7 @@ COBJS-$(CONFIG_SATA_SIL) += sata_sil.o
COBJS-$(CONFIG_IDE_SIL680) += sil680.o
COBJS-$(CONFIG_SCSI_SYM53C8XX) += sym53c8xx.o
COBJS-$(CONFIG_SYSTEMACE) += systemace.o
+COBJS-$(CONFIG_SANDBOX) += sandbox.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/block/sandbox.c b/drivers/block/sandbox.c
new file mode 100644
index 0000000..185cee8
--- /dev/null
+++ b/drivers/block/sandbox.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2013 Henrik Nordstrom <henrik at henriknordstrom.net>
+ *
+ * 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 <config.h>
+#include <common.h>
+#include <part.h>
+#include <os.h>
+
+#ifndef CONFIG_HOST_MAX_DEVICES
+#define CONFIG_HOST_MAX_DEVICES 4
+#endif
+
+static struct host_block_dev {
+ block_dev_desc_t blk_dev;
+ char *filename;
+ int fd;
+} host_devices[CONFIG_HOST_MAX_DEVICES];
+
+static struct host_block_dev *
+find_host_device(int dev)
+{
+ if (dev >= 0 && dev < CONFIG_HOST_MAX_DEVICES)
+ return &host_devices[dev];
+
+ printf("Invalid host device number\n");
+ return NULL;
+}
+
+static unsigned long host_block_read(int dev, unsigned long start,
+ lbaint_t blkcnt, void *buffer)
+{
+ struct host_block_dev *host_dev = find_host_device(dev);
+ if (os_lseek(host_dev->fd,
+ start * host_dev->blk_dev.blksz,
+ OS_SEEK_SET) == -1) {
+ printf("ERROR: Invalid position\n");
+ return -1;
+ }
+ ssize_t len = os_read(host_dev->fd, buffer,
+ blkcnt * host_dev->blk_dev.blksz);
+ if (len >= 0)
+ return len / host_dev->blk_dev.blksz;
+ return -1;
+}
+
+static unsigned long host_block_write(int dev, unsigned long start,
+ lbaint_t blkcnt, const void *buffer)
+{
+ struct host_block_dev *host_dev = find_host_device(dev);
+ if (os_lseek(host_dev->fd,
+ start * host_dev->blk_dev.blksz,
+ OS_SEEK_SET) == -1) {
+ printf("ERROR: Invalid position\n");
+ return -1;
+ }
+ ssize_t len = os_write(host_dev->fd, buffer, blkcnt *
+ host_dev->blk_dev.blksz);
+ if (len >= 0)
+ return len / host_dev->blk_dev.blksz;
+ return -1;
+}
+
+int host_dev_bind(int dev, char *filename)
+{
+ struct host_block_dev *host_dev = find_host_device(dev);
+ if (host_dev->blk_dev.priv) {
+ os_close(host_dev->fd);
+ host_dev->blk_dev.priv = NULL;
+ }
+ if (host_dev->filename)
+ free(host_dev->filename);
+ if (filename && *filename)
+ host_dev->filename = strdup(filename);
+ else
+ host_dev->filename = NULL;
+ return 0;
+}
+
+block_dev_desc_t *host_get_dev(int dev)
+{
+ struct host_block_dev *host_dev = find_host_device(dev);
+
+ if (!host_dev)
+ return NULL;
+
+ if (!host_dev->filename) {
+ printf("Not bound to a backing file\n");
+ return NULL;
+ }
+
+ block_dev_desc_t *blk_dev = &host_dev->blk_dev;
+ if (!host_dev->blk_dev.priv) {
+ host_dev->fd = os_open(host_dev->filename, OS_O_RDWR);
+ if (host_dev->fd == -1) {
+ printf("Failed to access host backing file '%s'\n",
+ host_dev->filename);
+ return NULL;
+ }
+ blk_dev->if_type = IF_TYPE_HOST;
+ blk_dev->priv = host_dev;
+ blk_dev->blksz = 512;
+ blk_dev->lba = os_lseek(host_dev->fd, 0, OS_SEEK_END) /
+ blk_dev->blksz;
+ blk_dev->block_read = host_block_read;
+ blk_dev->block_write = host_block_write;
+ blk_dev->dev = dev;
+ blk_dev->part_type = PART_TYPE_UNKNOWN;
+ init_part(blk_dev);
+ }
+ return blk_dev;
+}
diff --git a/include/config_fallbacks.h b/include/config_fallbacks.h
index 269b5c2..33affd7 100644
--- a/include/config_fallbacks.h
+++ b/include/config_fallbacks.h
@@ -49,7 +49,8 @@
defined(CONFIG_CMD_USB) || \
defined(CONFIG_CMD_PART) || \
defined(CONFIG_MMC) || \
- defined(CONFIG_SYSTEMACE)
+ defined(CONFIG_SYSTEMACE) || \
+ defined(CONFIG_SANDBOX)
#define HAVE_BLOCK_DEVICE
#endif
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index 406da43..b73fbac 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -39,6 +39,8 @@
#define CONFIG_CMD_EXT4
#define CONFIG_CMD_EXT4_WRITE
+#define CONFIG_DOS_PARTITION
+
#define CONFIG_SYS_VSNPRINTF
#define CONFIG_CMD_GPIO
diff --git a/include/part.h b/include/part.h
index c58a734..40a34c8 100644
--- a/include/part.h
+++ b/include/part.h
@@ -65,6 +65,7 @@ typedef struct block_dev_desc {
#define IF_TYPE_MMC 6
#define IF_TYPE_SD 7
#define IF_TYPE_SATA 8
+#define IF_TYPE_HOST 9
/* Part types */
#define PART_TYPE_UNKNOWN 0x00
@@ -109,6 +110,7 @@ block_dev_desc_t* usb_stor_get_dev(int dev);
block_dev_desc_t* mmc_get_dev(int dev);
block_dev_desc_t* systemace_get_dev(int dev);
block_dev_desc_t* mg_disk_get_dev(int dev);
+block_dev_desc_t *host_get_dev(int dev);
/* disk/part.c */
int get_partition_info (block_dev_desc_t * dev_desc, int part, disk_partition_t *info);
@@ -130,6 +132,7 @@ static inline block_dev_desc_t* usb_stor_get_dev(int dev) { return NULL; }
static inline block_dev_desc_t* mmc_get_dev(int dev) { return NULL; }
static inline block_dev_desc_t* systemace_get_dev(int dev) { return NULL; }
static inline block_dev_desc_t* mg_disk_get_dev(int dev) { return NULL; }
+static inline block_dev_desc_t *host_get_dev(int dev) { return NULL; }
static inline int get_partition_info (block_dev_desc_t * dev_desc, int part,
disk_partition_t *info) { return -1; }
--
1.8.1.4
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