sandbox: block driver using host file/device as backing store

Provide a way to use any host file or device as a block device in U-Boot.
This can be used to provide filesystem access within U-Boot to an ext2
image file on the host, for example.

The support is plumbed into the filesystem and partition interfaces.

We don't want to print a message in the driver every time we find a missing
device. Pass the information back to the caller where a message can be printed
if desired.

Signed-off-by: Henrik Nordström <henrik@henriknordstrom.net>
Signed-off-by: Simon Glass <sjg@chromium.org>
- Removed change to part.c get_device_and_partition()

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 64 insertions, 0 deletions

diff --git a/common/cmd_sandbox.c b/common/cmd_sandbox.c
index 8d59364..00982b1 100644
--- a/common/cmd_sandbox.c
+++ b/common/cmd_sandbox.c
@@ -6,6 +6,9 @@
 
 #include <common.h>
 #include <fs.h>
+#include <part.h>
+#include <sandboxblockdev.h>
+#include <asm/errno.h>
 
 static int do_sandbox_load(cmd_tbl_t *cmdtp, int flag, int argc,
 			   char * const argv[])
@@ -25,10 +28,69 @@ static int do_sandbox_save(cmd_tbl_t *cmdtp, int flag, int argc,
 	return do_save(cmdtp, flag, argc, argv, FS_TYPE_SANDBOX);
 }
 
+static int do_sandbox_bind(cmd_tbl_t *cmdtp, int flag, int argc,
+			   char * const argv[])
+{
+	if (argc < 2 || argc > 3)
+		return CMD_RET_USAGE;
+	char *ep;
+	char *dev_str = argv[1];
+	char *file = argc >= 3 ? argv[2] : NULL;
+	int dev = simple_strtoul(dev_str, &ep, 16);
+	if (*ep) {
+		printf("** Bad device specification %s **\n", dev_str);
+		return CMD_RET_USAGE;
+	}
+	return host_dev_bind(dev, file);
+}
+
+static int do_sandbox_info(cmd_tbl_t *cmdtp, int flag, int argc,
+			   char * const argv[])
+{
+	if (argc < 1 || argc > 2)
+		return CMD_RET_USAGE;
+	int min_dev = 0;
+	int max_dev = CONFIG_HOST_MAX_DEVICES - 1;
+	if (argc >= 2) {
+		char *ep;
+		char *dev_str = argv[1];
+		int dev = simple_strtoul(dev_str, &ep, 16);
+		if (*ep) {
+			printf("** Bad device specification %s **\n", dev_str);
+			return CMD_RET_USAGE;
+		}
+		min_dev = dev;
+		max_dev = dev;
+	}
+	int dev;
+	printf("%3s %12s %s\n", "dev", "blocks", "path");
+	for (dev = min_dev; dev <= max_dev; dev++) {
+		block_dev_desc_t *blk_dev;
+		int ret;
+
+		printf("%3d ", dev);
+		ret = host_get_dev_err(dev, &blk_dev);
+		if (ret) {
+			if (ret == -ENOENT)
+				puts("Not bound to a backing file\n");
+			else if (ret == -ENODEV)
+				puts("Invalid host device number\n");
+
+			continue;
+		}
+		struct host_block_dev *host_dev = blk_dev->priv;
+		printf("%12lu %s\n", (unsigned long)blk_dev->lba,
+		       host_dev->filename);
+	}
+	return 0;
+}
+
 static cmd_tbl_t cmd_sandbox_sub[] = {
 	U_BOOT_CMD_MKENT(load, 7, 0, do_sandbox_load, "", ""),
 	U_BOOT_CMD_MKENT(ls, 3, 0, do_sandbox_ls, "", ""),
 	U_BOOT_CMD_MKENT(save, 6, 0, do_sandbox_save, "", ""),
+	U_BOOT_CMD_MKENT(bind, 3, 0, do_sandbox_bind, "", ""),
+	U_BOOT_CMD_MKENT(info, 3, 0, do_sandbox_info, "", ""),
 };
 
 static int do_sandbox(cmd_tbl_t *cmdtp, int flag, int argc,
@@ -57,4 +119,6 @@ U_BOOT_CMD(
 	"sb ls host <filename>                      - list files on host\n"
 	"sb save host <dev> <filename> <addr> <bytes> [<offset>] - "
 		"save a file to host\n"
+	"sb bind <dev> [<filename>] - bind \"host\" device to file\n"
+	"sb info [<dev>]            - show device binding & info"
 );