sandbox: Provide a way to bind fixed/removeable devices

At present when a file is bound to a host device it is always marked as
removeable. Arguably the device is removeable, since it can be unbound at
will. However while it is bound, it is not considered removable by the
user. Also it is useful to be able to model both fixed and removeable
devices for code that distinguishes them.

Add a -r flag to the 'host bind' command and plumb it through to provide
this feature.

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

cmd/host.c

@@ -41,6 +41,7 @@ static int do_host_save(struct cmd_tbl *cmdtp, int flag, int argc,
 static int do_host_bind(struct cmd_tbl *cmdtp, int flag, int argc,
 			char *const argv[])
 {
+	bool removable = false;
 	const char *dev_str;
 	char *file;
 	char *ep;
@@ -49,7 +50,16 @@ static int do_host_bind(struct cmd_tbl *cmdtp, int flag, int argc,
 	/* Skip 'bind' */
 	argc--;
 	argv++;
-	if (argc < 1 || argv > 2)
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	if (!strcmp(argv[0], "-r")) {
+		removable = true;
+		argc--;
+		argv++;
+	}
+
+	if (argc > 2)
 		return CMD_RET_USAGE;
 	dev_str = argv[0];
 	dev = simple_strtoul(dev_str, &ep, 16);
@@ -59,7 +69,7 @@ static int do_host_bind(struct cmd_tbl *cmdtp, int flag, int argc,
 	}
 	file = argc > 1 ? argv[1] : NULL;
 
-	return !!host_dev_bind(dev, file);
+	return !!host_dev_bind(dev, file, removable);
 }
 
 static int do_host_info(struct cmd_tbl *cmdtp, int flag, int argc,
@@ -154,7 +164,7 @@ static struct cmd_tbl cmd_host_sub[] = {
 	U_BOOT_CMD_MKENT(ls, 3, 0, do_host_ls, "", ""),
 	U_BOOT_CMD_MKENT(save, 6, 0, do_host_save, "", ""),
 	U_BOOT_CMD_MKENT(size, 3, 0, do_host_size, "", ""),
-	U_BOOT_CMD_MKENT(bind, 3, 0, do_host_bind, "", ""),
+	U_BOOT_CMD_MKENT(bind, 4, 0, do_host_bind, "", ""),
 	U_BOOT_CMD_MKENT(info, 3, 0, do_host_info, "", ""),
 	U_BOOT_CMD_MKENT(dev, 0, 1, do_host_dev, "", ""),
 };
@@ -186,7 +196,8 @@ U_BOOT_CMD(
 	"host save hostfs - <addr> <filename> <bytes> [<offset>] - "
 		"save a file to host\n"
 	"host size hostfs - <filename> - determine size of file on host\n"
-	"host bind <dev> [<filename>] - bind \"host\" device to file\n"
+	"host bind [-r] <dev> [<filename>] - bind \"host\" device to file\n"
+	"     -r = mark as removable\n"
 	"host info [<dev>]            - show device binding & info\n"
 	"host dev [<dev>] - Set or retrieve the current host device\n"
 	"host commands use the \"hostfs\" device. The \"host\" device is used\n"

doc/arch/sandbox.rst

@@ -389,6 +389,8 @@ the contents of the root directory on the second partion of the image
    =>host bind 0 ./disk.raw
    =>ls host 0:2
 
+The device can be marked removeable with 'host bind -r'.
+
 A disk image can be created using the following commands::
 
    $> truncate -s 1200M ./disk.raw

drivers/block/sandbox.c

@@ -89,7 +89,7 @@ static unsigned long host_block_write(struct blk_desc *block_dev,
 }
 
 #ifdef CONFIG_BLK
-int host_dev_bind(int devnum, char *filename)
+int host_dev_bind(int devnum, char *filename, bool removable)
 {
 	struct host_block_dev *host_dev;
 	struct udevice *dev;
@@ -146,7 +146,7 @@ int host_dev_bind(int devnum, char *filename)
 	}
 
 	desc = blk_get_devnum_by_type(IF_TYPE_HOST, devnum);
-	desc->removable = 1;
+	desc->removable = removable;
 	snprintf(desc->vendor, BLK_VEN_SIZE, "U-Boot");
 	snprintf(desc->product, BLK_PRD_SIZE, "hostfile");
 	snprintf(desc->revision, BLK_REV_SIZE, "1.0");
@@ -160,7 +160,7 @@ err:
 	return ret;
 }
 #else
-int host_dev_bind(int dev, char *filename)
+int host_dev_bind(int dev, char *filename, bool removable)
 {
 	struct host_block_dev *host_dev = find_host_device(dev);
 
@@ -195,7 +195,7 @@ int host_dev_bind(int dev, char *filename)
 	blk_dev->block_write = host_block_write;
 	blk_dev->devnum = dev;
 	blk_dev->part_type = PART_TYPE_UNKNOWN;
-	blk_dev->removable = 1;
+	blk_dev->removable = removable;
 	snprintf(blk_dev->vendor, BLK_VEN_SIZE, "U-Boot");
 	snprintf(blk_dev->product, BLK_PRD_SIZE, "hostfile");
 	snprintf(blk_dev->revision, BLK_REV_SIZE, "1.0");

include/sandboxblockdev.h

@@ -14,6 +14,13 @@ struct host_block_dev {
 	int fd;
 };
 
-int host_dev_bind(int dev, char *filename);
+/**
+ * host_dev_bind() - Bind or unbind a device
+ *
+ * @dev: Device number (0=first slot)
+ * @filename: Host filename to use, or NULL to unbind
+ * @removable: true if the block device should mark itself as removable
+ */
+int host_dev_bind(int dev, char *filename, bool removable);
 
 #endif