usb: gadget: Remove File-backed Storage Gadget (g_file_storage).

The File-backed Storage Gadget (g_file_storage) gadget has been replaced
with Mass Storage Gadget (g_mass_storage) which uses the composite
framework.  This commit removes g_file_storage (and most references to it).

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>

5 files changed, 4 insertions, 3687 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index dfb51a45496c..63b5869e0940 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -721,31 +721,6 @@ config USB_FUNCTIONFS_GENERIC
 	  Include a configuration with the Function Filesystem alone with
 	  no Ethernet interface.
 
-config USB_FILE_STORAGE
-	tristate "File-backed Storage Gadget (DEPRECATED)"
-	depends on BLOCK
-	help
-	  The File-backed Storage Gadget acts as a USB Mass Storage
-	  disk drive.  As its storage repository it can use a regular
-	  file or a block device (in much the same way as the "loop"
-	  device driver), specified as a module parameter.
-
-	  Say "y" to link the driver statically, or "m" to build a
-	  dynamically linked module called "g_file_storage".
-
-	  NOTE: This driver is deprecated.  Its replacement is the
-	  Mass Storage Gadget.
-
-config USB_FILE_STORAGE_TEST
-	bool "File-backed Storage Gadget testing version"
-	depends on USB_FILE_STORAGE
-	default n
-	help
-	  Say "y" to generate the larger testing version of the
-	  File-backed Storage Gadget, useful for probing the
-	  behavior of USB Mass Storage hosts.  Not needed for
-	  normal operation.
-
 config USB_MASS_STORAGE
 	tristate "Mass Storage Gadget"
 	depends on BLOCK
@@ -756,8 +731,8 @@ config USB_MASS_STORAGE
 	  device (in much the same way as the "loop" device driver),
 	  specified as a module parameter or sysfs option.
 
-	  This driver is an updated replacement for the deprecated
-	  File-backed Storage Gadget (g_file_storage).
+	  This driver is a replacement for now removed File-backed
+	  Storage Gadget (g_file_storage).
 
 	  Say "y" to link the driver statically, or "m" to build
 	  a dynamically linked module called "g_mass_storage".
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 307be5fa824c..8b4acfd92aa3 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -44,7 +44,6 @@ g_ether-y			:= ether.o
 g_serial-y			:= serial.o
 g_midi-y			:= gmidi.o
 gadgetfs-y			:= inode.o
-g_file_storage-y		:= file_storage.o
 g_mass_storage-y		:= mass_storage.o
 g_printer-y			:= printer.o
 g_cdc-y				:= cdc2.o
@@ -62,7 +61,6 @@ obj-$(CONFIG_USB_AUDIO)		+= g_audio.o
 obj-$(CONFIG_USB_ETH)		+= g_ether.o
 obj-$(CONFIG_USB_GADGETFS)	+= gadgetfs.o
 obj-$(CONFIG_USB_FUNCTIONFS)	+= g_ffs.o
-obj-$(CONFIG_USB_FILE_STORAGE)	+= g_file_storage.o
 obj-$(CONFIG_USB_MASS_STORAGE)	+= g_mass_storage.o
 obj-$(CONFIG_USB_G_SERIAL)	+= g_serial.o
 obj-$(CONFIG_USB_G_PRINTER)	+= g_printer.o
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
deleted file mode 100644
index 3f7d640b6758..000000000000
--- a/drivers/usb/gadget/file_storage.c
+++ /dev/null
@@ -1,3656 +0,0 @@
-/*
- * file_storage.c -- File-backed USB Storage Gadget, for USB development
- *
- * Copyright (C) 2003-2008 Alan Stern
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions, and the following disclaimer,
- *    without modification.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The names of the above-listed copyright holders may not be used
- *    to endorse or promote products derived from this software without
- *    specific prior written permission.
- *
- * ALTERNATIVELY, this software may be distributed under the terms of the
- * GNU General Public License ("GPL") as published by the Free Software
- * Foundation, either version 2 of that License or (at your option) any
- * later version.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/*
- * The File-backed Storage Gadget acts as a USB Mass Storage device,
- * appearing to the host as a disk drive or as a CD-ROM drive.  In addition
- * to providing an example of a genuinely useful gadget driver for a USB
- * device, it also illustrates a technique of double-buffering for increased
- * throughput.  Last but not least, it gives an easy way to probe the
- * behavior of the Mass Storage drivers in a USB host.
- *
- * Backing storage is provided by a regular file or a block device, specified
- * by the "file" module parameter.  Access can be limited to read-only by
- * setting the optional "ro" module parameter.  (For CD-ROM emulation,
- * access is always read-only.)  The gadget will indicate that it has
- * removable media if the optional "removable" module parameter is set.
- *
- * The gadget supports the Control-Bulk (CB), Control-Bulk-Interrupt (CBI),
- * and Bulk-Only (also known as Bulk-Bulk-Bulk or BBB) transports, selected
- * by the optional "transport" module parameter.  It also supports the
- * following protocols: RBC (0x01), ATAPI or SFF-8020i (0x02), QIC-157 (0c03),
- * UFI (0x04), SFF-8070i (0x05), and transparent SCSI (0x06), selected by
- * the optional "protocol" module parameter.  In addition, the default
- * Vendor ID, Product ID, release number and serial number can be overridden.
- *
- * There is support for multiple logical units (LUNs), each of which has
- * its own backing file.  The number of LUNs can be set using the optional
- * "luns" module parameter (anywhere from 1 to 8), and the corresponding
- * files are specified using comma-separated lists for "file" and "ro".
- * The default number of LUNs is taken from the number of "file" elements;
- * it is 1 if "file" is not given.  If "removable" is not set then a backing
- * file must be specified for each LUN.  If it is set, then an unspecified
- * or empty backing filename means the LUN's medium is not loaded.  Ideally
- * each LUN would be settable independently as a disk drive or a CD-ROM
- * drive, but currently all LUNs have to be the same type.  The CD-ROM
- * emulation includes a single data track and no audio tracks; hence there
- * need be only one backing file per LUN.
- *
- * Requirements are modest; only a bulk-in and a bulk-out endpoint are
- * needed (an interrupt-out endpoint is also needed for CBI).  The memory
- * requirement amounts to two 16K buffers, size configurable by a parameter.
- * Support is included for both full-speed and high-speed operation.
- *
- * Note that the driver is slightly non-portable in that it assumes a
- * single memory/DMA buffer will be useable for bulk-in, bulk-out, and
- * interrupt-in endpoints.  With most device controllers this isn't an
- * issue, but there may be some with hardware restrictions that prevent
- * a buffer from being used by more than one endpoint.
- *
- * Module options:
- *
- *	file=filename[,filename...]
- *				Required if "removable" is not set, names of
- *					the files or block devices used for
- *					backing storage
- *	serial=HHHH...		Required serial number (string of hex chars)
- *	ro=b[,b...]		Default false, booleans for read-only access
- *	removable		Default false, boolean for removable media
- *	luns=N			Default N = number of filenames, number of
- *					LUNs to support
- *	nofua=b[,b...]		Default false, booleans for ignore FUA flag
- *					in SCSI WRITE(10,12) commands
- *	stall			Default determined according to the type of
- *					USB device controller (usually true),
- *					boolean to permit the driver to halt
- *					bulk endpoints
- *	cdrom			Default false, boolean for whether to emulate
- *					a CD-ROM drive
- *	transport=XXX		Default BBB, transport name (CB, CBI, or BBB)
- *	protocol=YYY		Default SCSI, protocol name (RBC, 8020 or
- *					ATAPI, QIC, UFI, 8070, or SCSI;
- *					also 1 - 6)
- *	vendor=0xVVVV		Default 0x0525 (NetChip), USB Vendor ID
- *	product=0xPPPP		Default 0xa4a5 (FSG), USB Product ID
- *	release=0xRRRR		Override the USB release number (bcdDevice)
- *	buflen=N		Default N=16384, buffer size used (will be
- *					rounded down to a multiple of
- *					PAGE_CACHE_SIZE)
- *
- * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "serial", "ro",
- * "removable", "luns", "nofua", "stall", and "cdrom" options are available;
- * default values are used for everything else.
- *
- * The pathnames of the backing files and the ro settings are available in
- * the attribute files "file", "nofua", and "ro" in the lun<n> subdirectory of
- * the gadget's sysfs directory.  If the "removable" option is set, writing to
- * these files will simulate ejecting/loading the medium (writing an empty
- * line means eject) and adjusting a write-enable tab.  Changes to the ro
- * setting are not allowed when the medium is loaded or if CD-ROM emulation
- * is being used.
- *
- * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
- * The driver's SCSI command interface was based on the "Information
- * technology - Small Computer System Interface - 2" document from
- * X3T9.2 Project 375D, Revision 10L, 7-SEP-93, available at
- * <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>.  The single exception
- * is opcode 0x23 (READ FORMAT CAPACITIES), which was based on the
- * "Universal Serial Bus Mass Storage Class UFI Command Specification"
- * document, Revision 1.0, December 14, 1998, available at
- * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>.
- */
-
-
-/*
- *				Driver Design
- *
- * The FSG driver is fairly straightforward.  There is a main kernel
- * thread that handles most of the work.  Interrupt routines field
- * callbacks from the controller driver: bulk- and interrupt-request
- * completion notifications, endpoint-0 events, and disconnect events.
- * Completion events are passed to the main thread by wakeup calls.  Many
- * ep0 requests are handled at interrupt time, but SetInterface,
- * SetConfiguration, and device reset requests are forwarded to the
- * thread in the form of "exceptions" using SIGUSR1 signals (since they
- * should interrupt any ongoing file I/O operations).
- *
- * The thread's main routine implements the standard command/data/status
- * parts of a SCSI interaction.  It and its subroutines are full of tests
- * for pending signals/exceptions -- all this polling is necessary since
- * the kernel has no setjmp/longjmp equivalents.  (Maybe this is an
- * indication that the driver really wants to be running in userspace.)
- * An important point is that so long as the thread is alive it keeps an
- * open reference to the backing file.  This will prevent unmounting
- * the backing file's underlying filesystem and could cause problems
- * during system shutdown, for example.  To prevent such problems, the
- * thread catches INT, TERM, and KILL signals and converts them into
- * an EXIT exception.
- *
- * In normal operation the main thread is started during the gadget's
- * fsg_bind() callback and stopped during fsg_unbind().  But it can also
- * exit when it receives a signal, and there's no point leaving the
- * gadget running when the thread is dead.  So just before the thread
- * exits, it deregisters the gadget driver.  This makes things a little
- * tricky: The driver is deregistered at two places, and the exiting
- * thread can indirectly call fsg_unbind() which in turn can tell the
- * thread to exit.  The first problem is resolved through the use of the
- * REGISTERED atomic bitflag; the driver will only be deregistered once.
- * The second problem is resolved by having fsg_unbind() check
- * fsg->state; it won't try to stop the thread if the state is already
- * FSG_STATE_TERMINATED.
- *
- * To provide maximum throughput, the driver uses a circular pipeline of
- * buffer heads (struct fsg_buffhd).  In principle the pipeline can be
- * arbitrarily long; in practice the benefits don't justify having more
- * than 2 stages (i.e., double buffering).  But it helps to think of the
- * pipeline as being a long one.  Each buffer head contains a bulk-in and
- * a bulk-out request pointer (since the buffer can be used for both
- * output and input -- directions always are given from the host's
- * point of view) as well as a pointer to the buffer and various state
- * variables.
- *
- * Use of the pipeline follows a simple protocol.  There is a variable
- * (fsg->next_buffhd_to_fill) that points to the next buffer head to use.
- * At any time that buffer head may still be in use from an earlier
- * request, so each buffer head has a state variable indicating whether
- * it is EMPTY, FULL, or BUSY.  Typical use involves waiting for the
- * buffer head to be EMPTY, filling the buffer either by file I/O or by
- * USB I/O (during which the buffer head is BUSY), and marking the buffer
- * head FULL when the I/O is complete.  Then the buffer will be emptied
- * (again possibly by USB I/O, during which it is marked BUSY) and
- * finally marked EMPTY again (possibly by a completion routine).
- *
- * A module parameter tells the driver to avoid stalling the bulk
- * endpoints wherever the transport specification allows.  This is
- * necessary for some UDCs like the SuperH, which cannot reliably clear a
- * halt on a bulk endpoint.  However, under certain circumstances the
- * Bulk-only specification requires a stall.  In such cases the driver
- * will halt the endpoint and set a flag indicating that it should clear
- * the halt in software during the next device reset.  Hopefully this
- * will permit everything to work correctly.  Furthermore, although the
- * specification allows the bulk-out endpoint to halt when the host sends
- * too much data, implementing this would cause an unavoidable race.
- * The driver will always use the "no-stall" approach for OUT transfers.
- *
- * One subtle point concerns sending status-stage responses for ep0
- * requests.  Some of these requests, such as device reset, can involve
- * interrupting an ongoing file I/O operation, which might take an
- * arbitrarily long time.  During that delay the host might give up on
- * the original ep0 request and issue a new one.  When that happens the
- * driver should not notify the host about completion of the original
- * request, as the host will no longer be waiting for it.  So the driver
- * assigns to each ep0 request a unique tag, and it keeps track of the
- * tag value of the request associated with a long-running exception
- * (device-reset, interface-change, or configuration-change).  When the
- * exception handler is finished, the status-stage response is submitted
- * only if the current ep0 request tag is equal to the exception request
- * tag.  Thus only the most recently received ep0 request will get a
- * status-stage response.
- *
- * Warning: This driver source file is too long.  It ought to be split up
- * into a header file plus about 3 separate .c files, to handle the details
- * of the Gadget, USB Mass Storage, and SCSI protocols.
- */
-
-
-/* #define VERBOSE_DEBUG */
-/* #define DUMP_MSGS */
-
-
-#include <linux/blkdev.h>
-#include <linux/completion.h>
-#include <linux/dcache.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/fcntl.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/kref.h>
-#include <linux/kthread.h>
-#include <linux/limits.h>
-#include <linux/module.h>
-#include <linux/rwsem.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/string.h>
-#include <linux/freezer.h>
-#include <linux/utsname.h>
-
-#include <linux/usb/composite.h>
-#include <linux/usb/ch9.h>
-#include <linux/usb/gadget.h>
-
-#include "gadget_chips.h"
-
-#define DRIVER_DESC		"File-backed Storage Gadget"
-#define DRIVER_NAME		"g_file_storage"
-#define DRIVER_VERSION		"1 September 2010"
-
-static       char fsg_string_manufacturer[64];
-static const char fsg_string_product[] = DRIVER_DESC;
-static const char fsg_string_config[] = "Self-powered";
-static const char fsg_string_interface[] = "Mass Storage";
-
-
-#include "storage_common.c"
-
-
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_AUTHOR("Alan Stern");
-MODULE_LICENSE("Dual BSD/GPL");
-
-/*
- * This driver assumes self-powered hardware and has no way for users to
- * trigger remote wakeup.  It uses autoconfiguration to select endpoints
- * and endpoint addresses.
- */
-
-
-/*-------------------------------------------------------------------------*/
-
-
-/* Encapsulate the module parameter settings */
-
-static struct {
-	char		*file[FSG_MAX_LUNS];
-	char		*serial;
-	bool		ro[FSG_MAX_LUNS];
-	bool		nofua[FSG_MAX_LUNS];
-	unsigned int	num_filenames;
-	unsigned int	num_ros;
-	unsigned int	num_nofuas;
-	unsigned int	nluns;
-
-	bool		removable;
-	bool		can_stall;
-	bool		cdrom;
-
-	char		*transport_parm;
-	char		*protocol_parm;
-	unsigned short	vendor;
-	unsigned short	product;
-	unsigned short	release;
-	unsigned int	buflen;
-
-	int		transport_type;
-	char		*transport_name;
-	int		protocol_type;
-	char		*protocol_name;
-
-} mod_data = {					// Default values
-	.transport_parm		= "BBB",
-	.protocol_parm		= "SCSI",
-	.removable		= 0,
-	.can_stall		= 1,
-	.cdrom			= 0,
-	.vendor			= FSG_VENDOR_ID,
-	.product		= FSG_PRODUCT_ID,
-	.release		= 0xffff,	// Use controller chip type
-	.buflen			= 16384,
-	};
-
-
-module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames,
-		S_IRUGO);
-MODULE_PARM_DESC(file, "names of backing files or devices");
-
-module_param_named(serial, mod_data.serial, charp, S_IRUGO);
-MODULE_PARM_DESC(serial, "USB serial number");
-
-module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO);
-MODULE_PARM_DESC(ro, "true to force read-only");
-
-module_param_array_named(nofua, mod_data.nofua, bool, &mod_data.num_nofuas,
-		S_IRUGO);
-MODULE_PARM_DESC(nofua, "true to ignore SCSI WRITE(10,12) FUA bit");
-
-module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
-MODULE_PARM_DESC(luns, "number of LUNs");
-
-module_param_named(removable, mod_data.removable, bool, S_IRUGO);
-MODULE_PARM_DESC(removable, "true to simulate removable media");
-
-module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
-MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
-
-module_param_named(cdrom, mod_data.cdrom, bool, S_IRUGO);
-MODULE_PARM_DESC(cdrom, "true to emulate cdrom instead of disk");
-
-/* In the non-TEST version, only the module parameters listed above
- * are available. */
-#ifdef CONFIG_USB_FILE_STORAGE_TEST
-
-module_param_named(transport, mod_data.transport_parm, charp, S_IRUGO);
-MODULE_PARM_DESC(transport, "type of transport (BBB, CBI, or CB)");
-
-module_param_named(protocol, mod_data.protocol_parm, charp, S_IRUGO);
-MODULE_PARM_DESC(protocol, "type of protocol (RBC, 8020, QIC, UFI, "
-		"8070, or SCSI)");
-
-module_param_named(vendor, mod_data.vendor, ushort, S_IRUGO);
-MODULE_PARM_DESC(vendor, "USB Vendor ID");
-
-module_param_named(product, mod_data.product, ushort, S_IRUGO);
-MODULE_PARM_DESC(product, "USB Product ID");
-
-module_param_named(release, mod_data.release, ushort, S_IRUGO);
-MODULE_PARM_DESC(release, "USB release number");
-
-module_param_named(buflen, mod_data.buflen, uint, S_IRUGO);
-MODULE_PARM_DESC(buflen, "I/O buffer size");
-
-#endif /* CONFIG_USB_FILE_STORAGE_TEST */
-
-
-/*
- * These definitions will permit the compiler to avoid generating code for
- * parts of the driver that aren't used in the non-TEST version.  Even gcc
- * can recognize when a test of a constant expression yields a dead code
- * path.
- */
-
-#ifdef CONFIG_USB_FILE_STORAGE_TEST
-
-#define transport_is_bbb()	(mod_data.transport_type == USB_PR_BULK)
-#define transport_is_cbi()	(mod_data.transport_type == USB_PR_CBI)
-#define protocol_is_scsi()	(mod_data.protocol_type == USB_SC_SCSI)
-
-#else
-
-#define transport_is_bbb()	1
-#define transport_is_cbi()	0
-#define protocol_is_scsi()	1
-
-#endif /* CONFIG_USB_FILE_STORAGE_TEST */
-
-
-/*-------------------------------------------------------------------------*/
-
-
-struct fsg_dev {
-	/* lock protects: state, all the req_busy's, and cbbuf_cmnd */
-	spinlock_t		lock;
-	struct usb_gadget	*gadget;
-
-	/* filesem protects: backing files in use */
-	struct rw_semaphore	filesem;
-
-	/* reference counting: wait until all LUNs are released */
-	struct kref		ref;
-
-	struct usb_ep		*ep0;		// Handy copy of gadget->ep0
-	struct usb_request	*ep0req;	// For control responses
-	unsigned int		ep0_req_tag;
-	const char		*ep0req_name;
-
-	struct usb_request	*intreq;	// For interrupt responses
-	int			intreq_busy;
-	struct fsg_buffhd	*intr_buffhd;
-
-	unsigned int		bulk_out_maxpacket;
-	enum fsg_state		state;		// For exception handling
-	unsigned int		exception_req_tag;
-
-	u8			config, new_config;
-
-	unsigned int		running : 1;
-	unsigned int		bulk_in_enabled : 1;
-	unsigned int		bulk_out_enabled : 1;
-	unsigned int		intr_in_enabled : 1;
-	unsigned int		phase_error : 1;
-	unsigned int		short_packet_received : 1;
-	unsigned int		bad_lun_okay : 1;
-
-	unsigned long		atomic_bitflags;
-#define REGISTERED		0
-#define IGNORE_BULK_OUT		1
-#define SUSPENDED		2
-
-	struct usb_ep		*bulk_in;
-	struct usb_ep		*bulk_out;
-	struct usb_ep		*intr_in;
-
-	struct fsg_buffhd	*next_buffhd_to_fill;
-	struct fsg_buffhd	*next_buffhd_to_drain;
-
-	int			thread_wakeup_needed;
-	struct completion	thread_notifier;
-	struct task_struct	*thread_task;
-
-	int			cmnd_size;
-	u8			cmnd[MAX_COMMAND_SIZE];
-	enum data_direction	data_dir;
-	u32			data_size;
-	u32			data_size_from_cmnd;
-	u32			tag;
-	unsigned int		lun;
-	u32			residue;
-	u32			usb_amount_left;
-
-	/* The CB protocol offers no way for a host to know when a command
-	 * has completed.  As a result the next command may arrive early,
-	 * and we will still have to handle it.  For that reason we need
-	 * a buffer to store new commands when using CB (or CBI, which
-	 * does not oblige a host to wait for command completion either). */
-	int			cbbuf_cmnd_size;
-	u8			cbbuf_cmnd[MAX_COMMAND_SIZE];
-
-	unsigned int		nluns;
-	struct fsg_lun		*luns;
-	struct fsg_lun		*curlun;
-	/* Must be the last entry */
-	struct fsg_buffhd	buffhds[];
-};
-
-typedef void (*fsg_routine_t)(struct fsg_dev *);
-
-static int exception_in_progress(struct fsg_dev *fsg)
-{
-	return (fsg->state > FSG_STATE_IDLE);
-}
-
-/* Make bulk-out requests be divisible by the maxpacket size */
-static void set_bulk_out_req_length(struct fsg_dev *fsg,
-		struct fsg_buffhd *bh, unsigned int length)
-{
-	unsigned int	rem;
-
-	bh->bulk_out_intended_length = length;
-	rem = length % fsg->bulk_out_maxpacket;
-	if (rem > 0)
-		length += fsg->bulk_out_maxpacket - rem;
-	bh->outreq->length = length;
-}
-
-static struct fsg_dev			*the_fsg;
-static struct usb_gadget_driver		fsg_driver;
-
-
-/*-------------------------------------------------------------------------*/
-
-static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
-{
-	const char	*name;
-
-	if (ep == fsg->bulk_in)
-		name = "bulk-in";
-	else if (ep == fsg->bulk_out)
-		name = "bulk-out";
-	else
-		name = ep->name;
-	DBG(fsg, "%s set halt\n", name);
-	return usb_ep_set_halt(ep);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * DESCRIPTORS ... most are static, but strings and (full) configuration
- * descriptors are built on demand.  Also the (static) config and interface
- * descriptors are adjusted during fsg_bind().
- */
-
-/* There is only one configuration. */
-#define	CONFIG_VALUE		1
-
-static struct usb_device_descriptor
-device_desc = {
-	.bLength =		sizeof device_desc,
-	.bDescriptorType =	USB_DT_DEVICE,
-
-	.bcdUSB =		cpu_to_le16(0x0200),
-	.bDeviceClass =		USB_CLASS_PER_INTERFACE,
-
-	/* The next three values can be overridden by module parameters */
-	.idVendor =		cpu_to_le16(FSG_VENDOR_ID),
-	.idProduct =		cpu_to_le16(FSG_PRODUCT_ID),
-	.bcdDevice =		cpu_to_le16(0xffff),
-
-	.iManufacturer =	FSG_STRING_MANUFACTURER,
-	.iProduct =		FSG_STRING_PRODUCT,
-	.iSerialNumber =	FSG_STRING_SERIAL,
-	.bNumConfigurations =	1,
-};
-
-static struct usb_config_descriptor
-config_desc = {
-	.bLength =		sizeof config_desc,
-	.bDescriptorType =	USB_DT_CONFIG,
-
-	/* wTotalLength computed by usb_gadget_config_buf() */
-	.bNumInterfaces =	1,
-	.bConfigurationValue =	CONFIG_VALUE,
-	.iConfiguration =	FSG_STRING_CONFIG,
-	.bmAttributes =		USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
-	.bMaxPower =		CONFIG_USB_GADGET_VBUS_DRAW / 2,
-};
-
-
-static struct usb_qualifier_descriptor
-dev_qualifier = {
-	.bLength =		sizeof dev_qualifier,
-	.bDescriptorType =	USB_DT_DEVICE_QUALIFIER,
-
-	.bcdUSB =		cpu_to_le16(0x0200),
-	.bDeviceClass =		USB_CLASS_PER_INTERFACE,
-
-	.bNumConfigurations =	1,
-};
-
-static int populate_bos(struct fsg_dev *fsg, u8 *buf)
-{
-	memcpy(buf, &fsg_bos_desc, USB_DT_BOS_SIZE);
-	buf += USB_DT_BOS_SIZE;
-
-	memcpy(buf, &fsg_ext_cap_desc, USB_DT_USB_EXT_CAP_SIZE);
-	buf += USB_DT_USB_EXT_CAP_SIZE;
-
-	memcpy(buf, &fsg_ss_cap_desc, USB_DT_USB_SS_CAP_SIZE);
-
-	return USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE
-		+ USB_DT_USB_EXT_CAP_SIZE;
-}
-
-/*
- * Config descriptors must agree with the code that sets configurations
- * and with code managing interfaces and their altsettings.  They must
- * also handle different speeds and other-speed requests.
- */
-static int populate_config_buf(struct usb_gadget *gadget,
-		u8 *buf, u8 type, unsigned index)
-{
-	enum usb_device_speed			speed = gadget->speed;
-	int					len;
-	const struct usb_descriptor_header	**function;
-
-	if (index > 0)
-		return -EINVAL;
-
-	if (gadget_is_dualspeed(gadget) && type == USB_DT_OTHER_SPEED_CONFIG)
-		speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed;
-	function = gadget_is_dualspeed(gadget) && speed == USB_SPEED_HIGH
-		? (const struct usb_descriptor_header **)fsg_hs_function
-		: (const struct usb_descriptor_header **)fsg_fs_function;
-
-	/* for now, don't advertise srp-only devices */
-	if (!gadget_is_otg(gadget))
-		function++;
-
-	len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function);
-	((struct usb_config_descriptor *) buf)->bDescriptorType = type;
-	return len;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* These routines may be called in process context or in_irq */
-
-/* Caller must hold fsg->lock */
-static void wakeup_thread(struct fsg_dev *fsg)
-{
-	/* Tell the main thread that something has happened */
-	fsg->thread_wakeup_needed = 1;
-	if (fsg->thread_task)
-		wake_up_process(fsg->thread_task);
-}
-
-
-static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
-{
-	unsigned long		flags;
-
-	/* Do nothing if a higher-priority exception is already in progress.
-	 * If a lower-or-equal priority exception is in progress, preempt it
-	 * and notify the main thread by sending it a signal. */
-	spin_lock_irqsave(&fsg->lock, flags);
-	if (fsg->state <= new_state) {
-		fsg->exception_req_tag = fsg->ep0_req_tag;
-		fsg->state = new_state;
-		if (fsg->thread_task)
-			send_sig_info(SIGUSR1, SEND_SIG_FORCED,
-					fsg->thread_task);
-	}
-	spin_unlock_irqrestore(&fsg->lock, flags);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* The disconnect callback and ep0 routines.  These always run in_irq,
- * except that ep0_queue() is called in the main thread to acknowledge
- * completion of various requests: set config, set interface, and
- * Bulk-only device reset. */
-
-static void fsg_disconnect(struct usb_gadget *gadget)
-{
-	struct fsg_dev		*fsg = get_gadget_data(gadget);
-
-	DBG(fsg, "disconnect or port reset\n");
-	raise_exception(fsg, FSG_STATE_DISCONNECT);
-}
-
-
-static int ep0_queue(struct fsg_dev *fsg)
-{
-	int	rc;
-
-	rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC);
-	if (rc != 0 && rc != -ESHUTDOWN) {
-
-		/* We can't do much more than wait for a reset */
-		WARNING(fsg, "error in submission: %s --> %d\n",
-				fsg->ep0->name, rc);
-	}
-	return rc;
-}
-
-static void ep0_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	struct fsg_dev		*fsg = ep->driver_data;
-
-	if (req->actual > 0)
-		dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual);
-	if (req->status || req->actual != req->length)
-		DBG(fsg, "%s --> %d, %u/%u\n", __func__,
-				req->status, req->actual, req->length);
-	if (req->status == -ECONNRESET)		// Request was cancelled
-		usb_ep_fifo_flush(ep);
-
-	if (req->status == 0 && req->context)
-		((fsg_routine_t) (req->context))(fsg);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Bulk and interrupt endpoint completion handlers.
- * These always run in_irq. */
-
-static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	struct fsg_dev		*fsg = ep->driver_data;
-	struct fsg_buffhd	*bh = req->context;
-
-	if (req->status || req->actual != req->length)
-		DBG(fsg, "%s --> %d, %u/%u\n", __func__,
-				req->status, req->actual, req->length);
-	if (req->status == -ECONNRESET)		// Request was cancelled
-		usb_ep_fifo_flush(ep);
-
-	/* Hold the lock while we update the request and buffer states */
-	smp_wmb();
-	spin_lock(&fsg->lock);
-	bh->inreq_busy = 0;
-	bh->state = BUF_STATE_EMPTY;
-	wakeup_thread(fsg);
-	spin_unlock(&fsg->lock);
-}
-
-static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	struct fsg_dev		*fsg = ep->driver_data;
-	struct fsg_buffhd	*bh = req->context;
-
-	dump_msg(fsg, "bulk-out", req->buf, req->actual);
-	if (req->status || req->actual != bh->bulk_out_intended_length)
-		DBG(fsg, "%s --> %d, %u/%u\n", __func__,
-				req->status, req->actual,
-				bh->bulk_out_intended_length);
-	if (req->status == -ECONNRESET)		// Request was cancelled
-		usb_ep_fifo_flush(ep);
-
-	/* Hold the lock while we update the request and buffer states */
-	smp_wmb();
-	spin_lock(&fsg->lock);
-	bh->outreq_busy = 0;
-	bh->state = BUF_STATE_FULL;
-	wakeup_thread(fsg);
-	spin_unlock(&fsg->lock);
-}
-
-
-#ifdef CONFIG_USB_FILE_STORAGE_TEST
-static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	struct fsg_dev		*fsg = ep->driver_data;
-	struct fsg_buffhd	*bh = req->context;
-
-	if (req->status || req->actual != req->length)
-		DBG(fsg, "%s --> %d, %u/%u\n", __func__,
-				req->status, req->actual, req->length);
-	if (req->status == -ECONNRESET)		// Request was cancelled
-		usb_ep_fifo_flush(ep);
-
-	/* Hold the lock while we update the request and buffer states */
-	smp_wmb();
-	spin_lock(&fsg->lock);
-	fsg->intreq_busy = 0;
-	bh->state = BUF_STATE_EMPTY;
-	wakeup_thread(fsg);
-	spin_unlock(&fsg->lock);
-}
-
-#else
-static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
-{}
-#endif /* CONFIG_USB_FILE_STORAGE_TEST */
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Ep0 class-specific handlers.  These always run in_irq. */
-
-#ifdef CONFIG_USB_FILE_STORAGE_TEST
-static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct usb_request	*req = fsg->ep0req;
-	static u8		cbi_reset_cmnd[6] = {
-			SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff};
-
-	/* Error in command transfer? */
-	if (req->status || req->length != req->actual ||
-			req->actual < 6 || req->actual > MAX_COMMAND_SIZE) {
-
-		/* Not all controllers allow a protocol stall after
-		 * receiving control-out data, but we'll try anyway. */
-		fsg_set_halt(fsg, fsg->ep0);
-		return;			// Wait for reset
-	}
-
-	/* Is it the special reset command? */
-	if (req->actual >= sizeof cbi_reset_cmnd &&
-			memcmp(req->buf, cbi_reset_cmnd,
-				sizeof cbi_reset_cmnd) == 0) {
-
-		/* Raise an exception to stop the current operation
-		 * and reinitialize our state. */
-		DBG(fsg, "cbi reset request\n");
-		raise_exception(fsg, FSG_STATE_RESET);
-		return;
-	}
-
-	VDBG(fsg, "CB[I] accept device-specific command\n");
-	spin_lock(&fsg->lock);
-
-	/* Save the command for later */
-	if (fsg->cbbuf_cmnd_size)
-		WARNING(fsg, "CB[I] overwriting previous command\n");
-	fsg->cbbuf_cmnd_size = req->actual;
-	memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
-
-	wakeup_thread(fsg);
-	spin_unlock(&fsg->lock);
-}
-
-#else
-static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{}
-#endif /* CONFIG_USB_FILE_STORAGE_TEST */
-
-
-static int class_setup_req(struct fsg_dev *fsg,
-		const struct usb_ctrlrequest *ctrl)
-{
-	struct usb_request	*req = fsg->ep0req;
-	int			value = -EOPNOTSUPP;
-	u16			w_index = le16_to_cpu(ctrl->wIndex);
-	u16                     w_value = le16_to_cpu(ctrl->wValue);
-	u16			w_length = le16_to_cpu(ctrl->wLength);
-
-	if (!fsg->config)
-		return value;
-
-	/* Handle Bulk-only class-specific requests */
-	if (transport_is_bbb()) {
-		switch (ctrl->bRequest) {
-
-		case US_BULK_RESET_REQUEST:
-			if (ctrl->bRequestType != (USB_DIR_OUT |
-					USB_TYPE_CLASS | USB_RECIP_INTERFACE))
-				break;
-			if (w_index != 0 || w_value != 0 || w_length != 0) {
-				value = -EDOM;
-				break;
-			}
-
-			/* Raise an exception to stop the current operation
-			 * and reinitialize our state. */
-			DBG(fsg, "bulk reset request\n");
-			raise_exception(fsg, FSG_STATE_RESET);
-			value = DELAYED_STATUS;
-			break;
-
-		case US_BULK_GET_MAX_LUN:
-			if (ctrl->bRequestType != (USB_DIR_IN |
-					USB_TYPE_CLASS | USB_RECIP_INTERFACE))
-				break;
-			if (w_index != 0 || w_value != 0 || w_length != 1) {
-				value = -EDOM;
-				break;
-			}
-			VDBG(fsg, "get max LUN\n");
-			*(u8 *) req->buf = fsg->nluns - 1;
-			value = 1;
-			break;
-		}
-	}
-
-	/* Handle CBI class-specific requests */
-	else {
-		switch (ctrl->bRequest) {
-
-		case USB_CBI_ADSC_REQUEST:
-			if (ctrl->bRequestType != (USB_DIR_OUT |
-					USB_TYPE_CLASS | USB_RECIP_INTERFACE))
-				break;
-			if (w_index != 0 || w_value != 0) {
-				value = -EDOM;
-				break;
-			}
-			if (w_length > MAX_COMMAND_SIZE) {
-				value = -EOVERFLOW;
-				break;
-			}
-			value = w_length;
-			fsg->ep0req->context = received_cbi_adsc;
-			break;
-		}
-	}
-
-	if (value == -EOPNOTSUPP)
-		VDBG(fsg,
-			"unknown class-specific control req "
-			"%02x.%02x v%04x i%04x l%u\n",
-			ctrl->bRequestType, ctrl->bRequest,
-			le16_to_cpu(ctrl->wValue), w_index, w_length);
-	return value;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Ep0 standard request handlers.  These always run in_irq. */
-
-static int standard_setup_req(struct fsg_dev *fsg,
-		const struct usb_ctrlrequest *ctrl)
-{
-	struct usb_request	*req = fsg->ep0req;
-	int			value = -EOPNOTSUPP;
-	u16			w_index = le16_to_cpu(ctrl->wIndex);
-	u16			w_value = le16_to_cpu(ctrl->wValue);
-
-	/* Usually this just stores reply data in the pre-allocated ep0 buffer,
-	 * but config change events will also reconfigure hardware. */
-	switch (ctrl->bRequest) {
-
-	case USB_REQ_GET_DESCRIPTOR:
-		if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
-				USB_RECIP_DEVICE))
-			break;
-		switch (w_value >> 8) {
-
-		case USB_DT_DEVICE:
-			VDBG(fsg, "get device descriptor\n");
-			device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
-			value = sizeof device_desc;
-			memcpy(req->buf, &device_desc, value);
-			break;
-		case USB_DT_DEVICE_QUALIFIER:
-			VDBG(fsg, "get device qualifier\n");
-			if (!gadget_is_dualspeed(fsg->gadget) ||
-					fsg->gadget->speed == USB_SPEED_SUPER)
-				break;
-			/*
-			 * Assume ep0 uses the same maxpacket value for both
-			 * speeds
-			 */
-			dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
-			value = sizeof dev_qualifier;
-			memcpy(req->buf, &dev_qualifier, value);
-			break;
-
-		case USB_DT_OTHER_SPEED_CONFIG:
-			VDBG(fsg, "get other-speed config descriptor\n");
-			if (!gadget_is_dualspeed(fsg->gadget) ||
-					fsg->gadget->speed == USB_SPEED_SUPER)
-				break;
-			goto get_config;
-		case USB_DT_CONFIG:
-			VDBG(fsg, "get configuration descriptor\n");
-get_config:
-			value = populate_config_buf(fsg->gadget,
-					req->buf,
-					w_value >> 8,
-					w_value & 0xff);
-			break;
-
-		case USB_DT_STRING:
-			VDBG(fsg, "get string descriptor\n");
-
-			/* wIndex == language code */
-			value = usb_gadget_get_string(&fsg_stringtab,
-					w_value & 0xff, req->buf);
-			break;
-
-		case USB_DT_BOS:
-			VDBG(fsg, "get bos descriptor\n");
-
-			if (gadget_is_superspeed(fsg->gadget))
-				value = populate_bos(fsg, req->buf);
-			break;
-		}
-
-		break;
-
-	/* One config, two speeds */
-	case USB_REQ_SET_CONFIGURATION:
-		if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD |
-				USB_RECIP_DEVICE))
-			break;
-		VDBG(fsg, "set configuration\n");
-		if (w_value == CONFIG_VALUE || w_value == 0) {
-			fsg->new_config = w_value;
-
-			/* Raise an exception to wipe out previous transaction
-			 * state (queued bufs, etc) and set the new config. */
-			raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
-			value = DELAYED_STATUS;
-		}
-		break;
-	case USB_REQ_GET_CONFIGURATION:
-		if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
-				USB_RECIP_DEVICE))
-			break;
-		VDBG(fsg, "get configuration\n");
-		*(u8 *) req->buf = fsg->config;
-		value = 1;
-		break;
-
-	case USB_REQ_SET_INTERFACE:
-		if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD |
-				USB_RECIP_INTERFACE))
-			break;
-		if (fsg->config && w_index == 0) {
-
-			/* Raise an exception to wipe out previous transaction
-			 * state (queued bufs, etc) and install the new
-			 * interface altsetting. */
-			raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE);
-			value = DELAYED_STATUS;
-		}
-		break;
-	case USB_REQ_GET_INTERFACE:
-		if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
-				USB_RECIP_INTERFACE))
-			break;
-		if (!fsg->config)
-			break;
-		if (w_index != 0) {
-			value = -EDOM;
-			break;
-		}
-		VDBG(fsg, "get interface\n");
-		*(u8 *) req->buf = 0;
-		value = 1;
-		break;
-
-	default:
-		VDBG(fsg,
-			"unknown control req %02x.%02x v%04x i%04x l%u\n",
-			ctrl->bRequestType, ctrl->bRequest,
-			w_value, w_index, le16_to_cpu(ctrl->wLength));
-	}
-
-	return value;
-}
-
-
-static int fsg_setup(struct usb_gadget *gadget,
-		const struct usb_ctrlrequest *ctrl)
-{
-	struct fsg_dev		*fsg = get_gadget_data(gadget);
-	int			rc;
-	int			w_length = le16_to_cpu(ctrl->wLength);
-
-	++fsg->ep0_req_tag;		// Record arrival of a new request
-	fsg->ep0req->context = NULL;
-	fsg->ep0req->length = 0;
-	dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl));
-
-	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
-		rc = class_setup_req(fsg, ctrl);
-	else
-		rc = standard_setup_req(fsg, ctrl);
-
-	/* Respond with data/status or defer until later? */
-	if (rc >= 0 && rc != DELAYED_STATUS) {
-		rc = min(rc, w_length);
-		fsg->ep0req->length = rc;
-		fsg->ep0req->zero = rc < w_length;
-		fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ?
-				"ep0-in" : "ep0-out");
-		rc = ep0_queue(fsg);
-	}
-
-	/* Device either stalls (rc < 0) or reports success */
-	return rc;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* All the following routines run in process context */
-
-
-/* Use this for bulk or interrupt transfers, not ep0 */
-static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
-		struct usb_request *req, int *pbusy,
-		enum fsg_buffer_state *state)
-{
-	int	rc;
-
-	if (ep == fsg->bulk_in)
-		dump_msg(fsg, "bulk-in", req->buf, req->length);
-	else if (ep == fsg->intr_in)
-		dump_msg(fsg, "intr-in", req->buf, req->length);
-
-	spin_lock_irq(&fsg->lock);
-	*pbusy = 1;
-	*state = BUF_STATE_BUSY;
-	spin_unlock_irq(&fsg->lock);
-	rc = usb_ep_queue(ep, req, GFP_KERNEL);
-	if (rc != 0) {
-		*pbusy = 0;
-		*state = BUF_STATE_EMPTY;
-
-		/* We can't do much more than wait for a reset */
-
-		/* Note: currently the net2280 driver fails zero-length
-		 * submissions if DMA is enabled. */
-		if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
-						req->length == 0))
-			WARNING(fsg, "error in submission: %s --> %d\n",
-					ep->name, rc);
-	}
-}
-
-
-static int sleep_thread(struct fsg_dev *fsg)
-{
-	int	rc = 0;
-
-	/* Wait until a signal arrives or we are woken up */
-	for (;;) {
-		try_to_freeze();
-		set_current_state(TASK_INTERRUPTIBLE);
-		if (signal_pending(current)) {
-			rc = -EINTR;
-			break;
-		}
-		if (fsg->thread_wakeup_needed)
-			break;
-		schedule();
-	}
-	__set_current_state(TASK_RUNNING);
-	fsg->thread_wakeup_needed = 0;
-	return rc;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int do_read(struct fsg_dev *fsg)
-{
-	struct fsg_lun		*curlun = fsg->curlun;
-	u32			lba;
-	struct fsg_buffhd	*bh;
-	int			rc;
-	u32			amount_left;
-	loff_t			file_offset, file_offset_tmp;
-	unsigned int		amount;
-	ssize_t			nread;
-
-	/* Get the starting Logical Block Address and check that it's
-	 * not too big */
-	if (fsg->cmnd[0] == READ_6)
-		lba = get_unaligned_be24(&fsg->cmnd[1]);
-	else {
-		lba = get_unaligned_be32(&fsg->cmnd[2]);
-
-		/* We allow DPO (Disable Page Out = don't save data in the
-		 * cache) and FUA (Force Unit Access = don't read from the
-		 * cache), but we don't implement them. */
-		if ((fsg->cmnd[1] & ~0x18) != 0) {
-			curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-			return -EINVAL;
-		}
-	}
-	if (lba >= curlun->num_sectors) {
-		curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
-		return -EINVAL;
-	}
-	file_offset = ((loff_t) lba) << curlun->blkbits;
-
-	/* Carry out the file reads */
-	amount_left = fsg->data_size_from_cmnd;
-	if (unlikely(amount_left == 0))
-		return -EIO;		// No default reply
-
-	for (;;) {
-
-		/* Figure out how much we need to read:
-		 * Try to read the remaining amount.
-		 * But don't read more than the buffer size.
-		 * And don't try to read past the end of the file.
-		 */
-		amount = min((unsigned int) amount_left, mod_data.buflen);
-		amount = min((loff_t) amount,
-				curlun->file_length - file_offset);
-
-		/* Wait for the next buffer to become available */
-		bh = fsg->next_buffhd_to_fill;
-		while (bh->state != BUF_STATE_EMPTY) {
-			rc = sleep_thread(fsg);
-			if (rc)
-				return rc;
-		}
-
-		/* If we were asked to read past the end of file,
-		 * end with an empty buffer. */
-		if (amount == 0) {
-			curlun->sense_data =
-					SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
-			curlun->sense_data_info = file_offset >> curlun->blkbits;
-			curlun->info_valid = 1;
-			bh->inreq->length = 0;
-			bh->state = BUF_STATE_FULL;
-			break;
-		}
-
-		/* Perform the read */
-		file_offset_tmp = file_offset;
-		nread = vfs_read(curlun->filp,
-				(char __user *) bh->buf,
-				amount, &file_offset_tmp);
-		VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
-				(unsigned long long) file_offset,
-				(int) nread);
-		if (signal_pending(current))
-			return -EINTR;
-
-		if (nread < 0) {
-			LDBG(curlun, "error in file read: %d\n",
-					(int) nread);
-			nread = 0;
-		} else if (nread < amount) {
-			LDBG(curlun, "partial file read: %d/%u\n",
-					(int) nread, amount);
-			nread = round_down(nread, curlun->blksize);
-		}
-		file_offset  += nread;
-		amount_left  -= nread;
-		fsg->residue -= nread;
-
-		/* Except at the end of the transfer, nread will be
-		 * equal to the buffer size, which is divisible by the
-		 * bulk-in maxpacket size.
-		 */
-		bh->inreq->length = nread;
-		bh->state = BUF_STATE_FULL;
-
-		/* If an error occurred, report it and its position */
-		if (nread < amount) {
-			curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
-			curlun->sense_data_info = file_offset >> curlun->blkbits;
-			curlun->info_valid = 1;
-			break;
-		}
-
-		if (amount_left == 0)
-			break;		// No more left to read
-
-		/* Send this buffer and go read some more */
-		bh->inreq->zero = 0;
-		start_transfer(fsg, fsg->bulk_in, bh->inreq,
-				&bh->inreq_busy, &bh->state);
-		fsg->next_buffhd_to_fill = bh->next;
-	}
-
-	return -EIO;		// No default reply
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int do_write(struct fsg_dev *fsg)
-{
-	struct fsg_lun		*curlun = fsg->curlun;
-	u32			lba;
-	struct fsg_buffhd	*bh;
-	int			get_some_more;
-	u32			amount_left_to_req, amount_left_to_write;
-	loff_t			usb_offset, file_offset, file_offset_tmp;
-	unsigned int		amount;
-	ssize_t			nwritten;
-	int			rc;
-
-	if (curlun->ro) {
-		curlun->sense_data = SS_WRITE_PROTECTED;
-		return -EINVAL;
-	}
-	spin_lock(&curlun->filp->f_lock);
-	curlun->filp->f_flags &= ~O_SYNC;	// Default is not to wait
-	spin_unlock(&curlun->filp->f_lock);
-
-	/* Get the starting Logical Block Address and check that it's
-	 * not too big */
-	if (fsg->cmnd[0] == WRITE_6)
-		lba = get_unaligned_be24(&fsg->cmnd[1]);
-	else {
-		lba = get_unaligned_be32(&fsg->cmnd[2]);
-
-		/* We allow DPO (Disable Page Out = don't save data in the
-		 * cache) and FUA (Force Unit Access = write directly to the
-		 * medium).  We don't implement DPO; we implement FUA by
-		 * performing synchronous output. */
-		if ((fsg->cmnd[1] & ~0x18) != 0) {
-			curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-			return -EINVAL;
-		}
-		/* FUA */
-		if (!curlun->nofua && (fsg->cmnd[1] & 0x08)) {
-			spin_lock(&curlun->filp->f_lock);
-			curlun->filp->f_flags |= O_DSYNC;
-			spin_unlock(&curlun->filp->f_lock);
-		}
-	}
-	if (lba >= curlun->num_sectors) {
-		curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
-		return -EINVAL;
-	}
-
-	/* Carry out the file writes */
-	get_some_more = 1;
-	file_offset = usb_offset = ((loff_t) lba) << curlun->blkbits;
-	amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
-
-	while (amount_left_to_write > 0) {
-
-		/* Queue a request for more data from the host */
-		bh = fsg->next_buffhd_to_fill;
-		if (bh->state == BUF_STATE_EMPTY && get_some_more) {
-
-			/* Figure out how much we want to get:
-			 * Try to get the remaining amount,
-			 * but not more than the buffer size.
-			 */
-			amount = min(amount_left_to_req, mod_data.buflen);
-
-			/* Beyond the end of the backing file? */
-			if (usb_offset >= curlun->file_length) {
-				get_some_more = 0;
-				curlun->sense_data =
-					SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
-				curlun->sense_data_info = usb_offset >> curlun->blkbits;
-				curlun->info_valid = 1;
-				continue;
-			}
-
-			/* Get the next buffer */
-			usb_offset += amount;
-			fsg->usb_amount_left -= amount;
-			amount_left_to_req -= amount;
-			if (amount_left_to_req == 0)
-				get_some_more = 0;
-
-			/* Except at the end of the transfer, amount will be
-			 * equal to the buffer size, which is divisible by
-			 * the bulk-out maxpacket size.
-			 */
-			set_bulk_out_req_length(fsg, bh, amount);
-			start_transfer(fsg, fsg->bulk_out, bh->outreq,
-					&bh->outreq_busy, &bh->state);
-			fsg->next_buffhd_to_fill = bh->next;
-			continue;
-		}
-
-		/* Write the received data to the backing file */
-		bh = fsg->next_buffhd_to_drain;
-		if (bh->state == BUF_STATE_EMPTY && !get_some_more)
-			break;			// We stopped early
-		if (bh->state == BUF_STATE_FULL) {
-			smp_rmb();
-			fsg->next_buffhd_to_drain = bh->next;
-			bh->state = BUF_STATE_EMPTY;
-
-			/* Did something go wrong with the transfer? */
-			if (bh->outreq->status != 0) {
-				curlun->sense_data = SS_COMMUNICATION_FAILURE;
-				curlun->sense_data_info = file_offset >> curlun->blkbits;
-				curlun->info_valid = 1;
-				break;
-			}
-
-			amount = bh->outreq->actual;
-			if (curlun->file_length - file_offset < amount) {
-				LERROR(curlun,
-	"write %u @ %llu beyond end %llu\n",
-	amount, (unsigned long long) file_offset,
-	(unsigned long long) curlun->file_length);
-				amount = curlun->file_length - file_offset;
-			}
-
-			/* Don't accept excess data.  The spec doesn't say
-			 * what to do in this case.  We'll ignore the error.
-			 */
-			amount = min(amount, bh->bulk_out_intended_length);
-
-			/* Don't write a partial block */
-			amount = round_down(amount, curlun->blksize);
-			if (amount == 0)
-				goto empty_write;
-
-			/* Perform the write */
-			file_offset_tmp = file_offset;
-			nwritten = vfs_write(curlun->filp,
-					(char __user *) bh->buf,
-					amount, &file_offset_tmp);
-			VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
-					(unsigned long long) file_offset,
-					(int) nwritten);
-			if (signal_pending(current))
-				return -EINTR;		// Interrupted!
-
-			if (nwritten < 0) {
-				LDBG(curlun, "error in file write: %d\n",
-						(int) nwritten);
-				nwritten = 0;
-			} else if (nwritten < amount) {
-				LDBG(curlun, "partial file write: %d/%u\n",
-						(int) nwritten, amount);
-				nwritten = round_down(nwritten, curlun->blksize);
-			}
-			file_offset += nwritten;
-			amount_left_to_write -= nwritten;
-			fsg->residue -= nwritten;
-
-			/* If an error occurred, report it and its position */
-			if (nwritten < amount) {
-				curlun->sense_data = SS_WRITE_ERROR;
-				curlun->sense_data_info = file_offset >> curlun->blkbits;
-				curlun->info_valid = 1;
-				break;
-			}
-
- empty_write:
-			/* Did the host decide to stop early? */
-			if (bh->outreq->actual < bh->bulk_out_intended_length) {
-				fsg->short_packet_received = 1;
-				break;
-			}
-			continue;
-		}
-
-		/* Wait for something to happen */
-		rc = sleep_thread(fsg);
-		if (rc)
-			return rc;
-	}
-
-	return -EIO;		// No default reply
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int do_synchronize_cache(struct fsg_dev *fsg)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-	int		rc;
-
-	/* We ignore the requested LBA and write out all file's
-	 * dirty data buffers. */
-	rc = fsg_lun_fsync_sub(curlun);
-	if (rc)
-		curlun->sense_data = SS_WRITE_ERROR;
-	return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static void invalidate_sub(struct fsg_lun *curlun)
-{
-	struct file	*filp = curlun->filp;
-	struct inode	*inode = filp->f_path.dentry->d_inode;
-	unsigned long	rc;
-
-	rc = invalidate_mapping_pages(inode->i_mapping, 0, -1);
-	VLDBG(curlun, "invalidate_mapping_pages -> %ld\n", rc);
-}
-
-static int do_verify(struct fsg_dev *fsg)
-{
-	struct fsg_lun		*curlun = fsg->curlun;
-	u32			lba;
-	u32			verification_length;
-	struct fsg_buffhd	*bh = fsg->next_buffhd_to_fill;
-	loff_t			file_offset, file_offset_tmp;
-	u32			amount_left;
-	unsigned int		amount;
-	ssize_t			nread;
-
-	/* Get the starting Logical Block Address and check that it's
-	 * not too big */
-	lba = get_unaligned_be32(&fsg->cmnd[2]);
-	if (lba >= curlun->num_sectors) {
-		curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
-		return -EINVAL;
-	}
-
-	/* We allow DPO (Disable Page Out = don't save data in the
-	 * cache) but we don't implement it. */
-	if ((fsg->cmnd[1] & ~0x10) != 0) {
-		curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-		return -EINVAL;
-	}
-
-	verification_length = get_unaligned_be16(&fsg->cmnd[7]);
-	if (unlikely(verification_length == 0))
-		return -EIO;		// No default reply
-
-	/* Prepare to carry out the file verify */
-	amount_left = verification_length << curlun->blkbits;
-	file_offset = ((loff_t) lba) << curlun->blkbits;
-
-	/* Write out all the dirty buffers before invalidating them */
-	fsg_lun_fsync_sub(curlun);
-	if (signal_pending(current))
-		return -EINTR;
-
-	invalidate_sub(curlun);
-	if (signal_pending(current))
-		return -EINTR;
-
-	/* Just try to read the requested blocks */
-	while (amount_left > 0) {
-
-		/* Figure out how much we need to read:
-		 * Try to read the remaining amount, but not more than
-		 * the buffer size.
-		 * And don't try to read past the end of the file.
-		 */
-		amount = min((unsigned int) amount_left, mod_data.buflen);
-		amount = min((loff_t) amount,
-				curlun->file_length - file_offset);
-		if (amount == 0) {
-			curlun->sense_data =
-					SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
-			curlun->sense_data_info = file_offset >> curlun->blkbits;
-			curlun->info_valid = 1;
-			break;
-		}
-
-		/* Perform the read */
-		file_offset_tmp = file_offset;
-		nread = vfs_read(curlun->filp,
-				(char __user *) bh->buf,
-				amount, &file_offset_tmp);
-		VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
-				(unsigned long long) file_offset,
-				(int) nread);
-		if (signal_pending(current))
-			return -EINTR;
-
-		if (nread < 0) {
-			LDBG(curlun, "error in file verify: %d\n",
-					(int) nread);
-			nread = 0;
-		} else if (nread < amount) {
-			LDBG(curlun, "partial file verify: %d/%u\n",
-					(int) nread, amount);
-			nread = round_down(nread, curlun->blksize);
-		}
-		if (nread == 0) {
-			curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
-			curlun->sense_data_info = file_offset >> curlun->blkbits;
-			curlun->info_valid = 1;
-			break;
-		}
-		file_offset += nread;
-		amount_left -= nread;
-	}
-	return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	u8	*buf = (u8 *) bh->buf;
-
-	static char vendor_id[] = "Linux   ";
-	static char product_disk_id[] = "File-Stor Gadget";
-	static char product_cdrom_id[] = "File-CD Gadget  ";
-
-	if (!fsg->curlun) {		// Unsupported LUNs are okay
-		fsg->bad_lun_okay = 1;
-		memset(buf, 0, 36);
-		buf[0] = 0x7f;		// Unsupported, no device-type
-		buf[4] = 31;		// Additional length
-		return 36;
-	}
-
-	memset(buf, 0, 8);
-	buf[0] = (mod_data.cdrom ? TYPE_ROM : TYPE_DISK);
-	if (mod_data.removable)
-		buf[1] = 0x80;
-	buf[2] = 2;		// ANSI SCSI level 2
-	buf[3] = 2;		// SCSI-2 INQUIRY data format
-	buf[4] = 31;		// Additional length
-				// No special options
-	sprintf(buf + 8, "%-8s%-16s%04x", vendor_id,
-			(mod_data.cdrom ? product_cdrom_id :
-				product_disk_id),
-			mod_data.release);
-	return 36;
-}
-
-
-static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-	u8		*buf = (u8 *) bh->buf;
-	u32		sd, sdinfo;
-	int		valid;
-
-	/*
-	 * From the SCSI-2 spec., section 7.9 (Unit attention condition):
-	 *
-	 * If a REQUEST SENSE command is received from an initiator
-	 * with a pending unit attention condition (before the target
-	 * generates the contingent allegiance condition), then the
-	 * target shall either:
-	 *   a) report any pending sense data and preserve the unit
-	 *	attention condition on the logical unit, or,
-	 *   b) report the unit attention condition, may discard any
-	 *	pending sense data, and clear the unit attention
-	 *	condition on the logical unit for that initiator.
-	 *
-	 * FSG normally uses option a); enable this code to use option b).
-	 */
-#if 0
-	if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
-		curlun->sense_data = curlun->unit_attention_data;
-		curlun->unit_attention_data = SS_NO_SENSE;
-	}
-#endif
-
-	if (!curlun) {		// Unsupported LUNs are okay
-		fsg->bad_lun_okay = 1;
-		sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
-		sdinfo = 0;
-		valid = 0;
-	} else {
-		sd = curlun->sense_data;
-		sdinfo = curlun->sense_data_info;
-		valid = curlun->info_valid << 7;
-		curlun->sense_data = SS_NO_SENSE;
-		curlun->sense_data_info = 0;
-		curlun->info_valid = 0;
-	}
-
-	memset(buf, 0, 18);
-	buf[0] = valid | 0x70;			// Valid, current error
-	buf[2] = SK(sd);
-	put_unaligned_be32(sdinfo, &buf[3]);	/* Sense information */
-	buf[7] = 18 - 8;			// Additional sense length
-	buf[12] = ASC(sd);
-	buf[13] = ASCQ(sd);
-	return 18;
-}
-
-
-static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-	u32		lba = get_unaligned_be32(&fsg->cmnd[2]);
-	int		pmi = fsg->cmnd[8];
-	u8		*buf = (u8 *) bh->buf;
-
-	/* Check the PMI and LBA fields */
-	if (pmi > 1 || (pmi == 0 && lba != 0)) {
-		curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-		return -EINVAL;
-	}
-
-	put_unaligned_be32(curlun->num_sectors - 1, &buf[0]);
-						/* Max logical block */
-	put_unaligned_be32(curlun->blksize, &buf[4]);	/* Block length */
-	return 8;
-}
-
-
-static int do_read_header(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-	int		msf = fsg->cmnd[1] & 0x02;
-	u32		lba = get_unaligned_be32(&fsg->cmnd[2]);
-	u8		*buf = (u8 *) bh->buf;
-
-	if ((fsg->cmnd[1] & ~0x02) != 0) {		/* Mask away MSF */
-		curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-		return -EINVAL;
-	}
-	if (lba >= curlun->num_sectors) {
-		curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
-		return -EINVAL;
-	}
-
-	memset(buf, 0, 8);
-	buf[0] = 0x01;		/* 2048 bytes of user data, rest is EC */
-	store_cdrom_address(&buf[4], msf, lba);
-	return 8;
-}
-
-
-static int do_read_toc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-	int		msf = fsg->cmnd[1] & 0x02;
-	int		start_track = fsg->cmnd[6];
-	u8		*buf = (u8 *) bh->buf;
-
-	if ((fsg->cmnd[1] & ~0x02) != 0 ||		/* Mask away MSF */
-			start_track > 1) {
-		curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-		return -EINVAL;
-	}
-
-	memset(buf, 0, 20);
-	buf[1] = (20-2);		/* TOC data length */
-	buf[2] = 1;			/* First track number */
-	buf[3] = 1;			/* Last track number */
-	buf[5] = 0x16;			/* Data track, copying allowed */
-	buf[6] = 0x01;			/* Only track is number 1 */
-	store_cdrom_address(&buf[8], msf, 0);
-
-	buf[13] = 0x16;			/* Lead-out track is data */
-	buf[14] = 0xAA;			/* Lead-out track number */
-	store_cdrom_address(&buf[16], msf, curlun->num_sectors);
-	return 20;
-}
-
-
-static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-	int		mscmnd = fsg->cmnd[0];
-	u8		*buf = (u8 *) bh->buf;
-	u8		*buf0 = buf;
-	int		pc, page_code;
-	int		changeable_values, all_pages;
-	int		valid_page = 0;
-	int		len, limit;
-
-	if ((fsg->cmnd[1] & ~0x08) != 0) {		// Mask away DBD
-		curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-		return -EINVAL;
-	}
-	pc = fsg->cmnd[2] >> 6;
-	page_code = fsg->cmnd[2] & 0x3f;
-	if (pc == 3) {
-		curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
-		return -EINVAL;
-	}
-	changeable_values = (pc == 1);
-	all_pages = (page_code == 0x3f);
-
-	/* Write the mode parameter header.  Fixed values are: default
-	 * medium type, no cache control (DPOFUA), and no block descriptors.
-	 * The only variable value is the WriteProtect bit.  We will fill in
-	 * the mode data length later. */
-	memset(buf, 0, 8);
-	if (mscmnd == MODE_SENSE) {
-		buf[2] = (curlun->ro ? 0x80 : 0x00);		// WP, DPOFUA
-		buf += 4;
-		limit = 255;
-	} else {			// MODE_SENSE_10
-		buf[3] = (curlun->ro ? 0x80 : 0x00);		// WP, DPOFUA
-		buf += 8;
-		limit = 65535;		// Should really be mod_data.buflen
-	}
-
-	/* No block descriptors */
-
-	/* The mode pages, in numerical order.  The only page we support
-	 * is the Caching page. */
-	if (page_code == 0x08 || all_pages) {
-		valid_page = 1;
-		buf[0] = 0x08;		// Page code
-		buf[1] = 10;		// Page length
-		memset(buf+2, 0, 10);	// None of the fields are changeable
-
-		if (!changeable_values) {
-			buf[2] = 0x04;	// Write cache enable,
-					// Read cache not disabled
-					// No cache retention priorities
-			put_unaligned_be16(0xffff, &buf[4]);
-					/* Don't disable prefetch */
-					/* Minimum prefetch = 0 */
-			put_unaligned_be16(0xffff, &buf[8]);
-					/* Maximum prefetch */
-			put_unaligned_be16(0xffff, &buf[10]);
-					/* Maximum prefetch ceiling */
-		}
-		buf += 12;
-	}
-
-	/* Check that a valid page was requested and the mode data length
-	 * isn't too long. */
-	len = buf - buf0;
-	if (!valid_page || len > limit) {
-		curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-		return -EINVAL;
-	}
-
-	/*  Store the mode data length */
-	if (mscmnd == MODE_SENSE)
-		buf0[0] = len - 1;
-	else
-		put_unaligned_be16(len - 2, buf0);
-	return len;
-}
-
-
-static int do_start_stop(struct fsg_dev *fsg)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-	int		loej, start;
-
-	if (!mod_data.removable) {
-		curlun->sense_data = SS_INVALID_COMMAND;
-		return -EINVAL;
-	}
-
-	// int immed = fsg->cmnd[1] & 0x01;
-	loej = fsg->cmnd[4] & 0x02;
-	start = fsg->cmnd[4] & 0x01;
-
-#ifdef CONFIG_USB_FILE_STORAGE_TEST
-	if ((fsg->cmnd[1] & ~0x01) != 0 ||		// Mask away Immed
-			(fsg->cmnd[4] & ~0x03) != 0) {	// Mask LoEj, Start
-		curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-		return -EINVAL;
-	}
-
-	if (!start) {
-
-		/* Are we allowed to unload the media? */
-		if (curlun->prevent_medium_removal) {
-			LDBG(curlun, "unload attempt prevented\n");
-			curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
-			return -EINVAL;
-		}
-		if (loej) {		// Simulate an unload/eject
-			up_read(&fsg->filesem);
-			down_write(&fsg->filesem);
-			fsg_lun_close(curlun);
-			up_write(&fsg->filesem);
-			down_read(&fsg->filesem);
-		}
-	} else {
-
-		/* Our emulation doesn't support mounting; the medium is
-		 * available for use as soon as it is loaded. */
-		if (!fsg_lun_is_open(curlun)) {
-			curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
-			return -EINVAL;
-		}
-	}
-#endif
-	return 0;
-}
-
-
-static int do_prevent_allow(struct fsg_dev *fsg)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-	int		prevent;
-
-	if (!mod_data.removable) {
-		curlun->sense_data = SS_INVALID_COMMAND;
-		return -EINVAL;
-	}
-
-	prevent = fsg->cmnd[4] & 0x01;
-	if ((fsg->cmnd[4] & ~0x01) != 0) {		// Mask away Prevent
-		curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-		return -EINVAL;
-	}
-
-	if (curlun->prevent_medium_removal && !prevent)
-		fsg_lun_fsync_sub(curlun);
-	curlun->prevent_medium_removal = prevent;
-	return 0;
-}
-
-
-static int do_read_format_capacities(struct fsg_dev *fsg,
-			struct fsg_buffhd *bh)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-	u8		*buf = (u8 *) bh->buf;
-
-	buf[0] = buf[1] = buf[2] = 0;
-	buf[3] = 8;		// Only the Current/Maximum Capacity Descriptor
-	buf += 4;
-
-	put_unaligned_be32(curlun->num_sectors, &buf[0]);
-						/* Number of blocks */
-	put_unaligned_be32(curlun->blksize, &buf[4]);	/* Block length */
-	buf[4] = 0x02;				/* Current capacity */
-	return 12;
-}
-
-
-static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct fsg_lun	*curlun = fsg->curlun;
-
-	/* We don't support MODE SELECT */
-	curlun->sense_data = SS_INVALID_COMMAND;
-	return -EINVAL;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
-{
-	int	rc;
-
-	rc = fsg_set_halt(fsg, fsg->bulk_in);
-	if (rc == -EAGAIN)
-		VDBG(fsg, "delayed bulk-in endpoint halt\n");
-	while (rc != 0) {
-		if (rc != -EAGAIN) {
-			WARNING(fsg, "usb_ep_set_halt -> %d\n", rc);
-			rc = 0;
-			break;
-		}
-
-		/* Wait for a short time and then try again */
-		if (msleep_interruptible(100) != 0)
-			return -EINTR;
-		rc = usb_ep_set_halt(fsg->bulk_in);
-	}
-	return rc;
-}
-
-static int wedge_bulk_in_endpoint(struct fsg_dev *fsg)
-{
-	int	rc;
-
-	DBG(fsg, "bulk-in set wedge\n");
-	rc = usb_ep_set_wedge(fsg->bulk_in);
-	if (rc == -EAGAIN)
-		VDBG(fsg, "delayed bulk-in endpoint wedge\n");
-	while (rc != 0) {
-		if (rc != -EAGAIN) {
-			WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc);
-			rc = 0;
-			break;
-		}
-
-		/* Wait for a short time and then try again */
-		if (msleep_interruptible(100) != 0)
-			return -EINTR;
-		rc = usb_ep_set_wedge(fsg->bulk_in);
-	}
-	return rc;
-}
-
-static int throw_away_data(struct fsg_dev *fsg)
-{
-	struct fsg_buffhd	*bh;
-	u32			amount;
-	int			rc;
-
-	while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
-			fsg->usb_amount_left > 0) {
-
-		/* Throw away the data in a filled buffer */
-		if (bh->state == BUF_STATE_FULL) {
-			smp_rmb();
-			bh->state = BUF_STATE_EMPTY;
-			fsg->next_buffhd_to_drain = bh->next;
-
-			/* A short packet or an error ends everything */
-			if (bh->outreq->actual < bh->bulk_out_intended_length ||
-					bh->outreq->status != 0) {
-				raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
-				return -EINTR;
-			}
-			continue;
-		}
-
-		/* Try to submit another request if we need one */
-		bh = fsg->next_buffhd_to_fill;
-		if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
-			amount = min(fsg->usb_amount_left,
-					(u32) mod_data.buflen);
-
-			/* Except at the end of the transfer, amount will be
-			 * equal to the buffer size, which is divisible by
-			 * the bulk-out maxpacket size.
-			 */
-			set_bulk_out_req_length(fsg, bh, amount);
-			start_transfer(fsg, fsg->bulk_out, bh->outreq,
-					&bh->outreq_busy, &bh->state);
-			fsg->next_buffhd_to_fill = bh->next;
-			fsg->usb_amount_left -= amount;
-			continue;
-		}
-
-		/* Otherwise wait for something to happen */
-		rc = sleep_thread(fsg);
-		if (rc)
-			return rc;
-	}
-	return 0;
-}
-
-
-static int finish_reply(struct fsg_dev *fsg)
-{
-	struct fsg_buffhd	*bh = fsg->next_buffhd_to_fill;
-	int			rc = 0;
-
-	switch (fsg->data_dir) {
-	case DATA_DIR_NONE:
-		break;			// Nothing to send
-
-	/* If we don't know whether the host wants to read or write,
-	 * this must be CB or CBI with an unknown command.  We mustn't
-	 * try to send or receive any data.  So stall both bulk pipes
-	 * if we can and wait for a reset. */
-	case DATA_DIR_UNKNOWN:
-		if (mod_data.can_stall) {
-			fsg_set_halt(fsg, fsg->bulk_out);
-			rc = halt_bulk_in_endpoint(fsg);
-		}
-		break;
-
-	/* All but the last buffer of data must have already been sent */
-	case DATA_DIR_TO_HOST:
-		if (fsg->data_size == 0)
-			;		// Nothing to send
-
-		/* If there's no residue, simply send the last buffer */
-		else if (fsg->residue == 0) {
-			bh->inreq->zero = 0;
-			start_transfer(fsg, fsg->bulk_in, bh->inreq,
-					&bh->inreq_busy, &bh->state);
-			fsg->next_buffhd_to_fill = bh->next;
-		}
-
-		/* There is a residue.  For CB and CBI, simply mark the end
-		 * of the data with a short packet.  However, if we are
-		 * allowed to stall, there was no data at all (residue ==
-		 * data_size), and the command failed (invalid LUN or
-		 * sense data is set), then halt the bulk-in endpoint
-		 * instead. */
-		else if (!transport_is_bbb()) {
-			if (mod_data.can_stall &&
-					fsg->residue == fsg->data_size &&
-	(!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) {
-				bh->state = BUF_STATE_EMPTY;
-				rc = halt_bulk_in_endpoint(fsg);
-			} else {
-				bh->inreq->zero = 1;
-				start_transfer(fsg, fsg->bulk_in, bh->inreq,
-						&bh->inreq_busy, &bh->state);
-				fsg->next_buffhd_to_fill = bh->next;
-			}
-		}
-
-		/*
-		 * For Bulk-only, mark the end of the data with a short
-		 * packet.  If we are allowed to stall, halt the bulk-in
-		 * endpoint.  (Note: This violates the Bulk-Only Transport
-		 * specification, which requires us to pad the data if we
-		 * don't halt the endpoint.  Presumably nobody will mind.)
-		 */
-		else {
-			bh->inreq->zero = 1;
-			start_transfer(fsg, fsg->bulk_in, bh->inreq,
-					&bh->inreq_busy, &bh->state);
-			fsg->next_buffhd_to_fill = bh->next;
-			if (mod_data.can_stall)
-				rc = halt_bulk_in_endpoint(fsg);
-		}
-		break;
-
-	/* We have processed all we want from the data the host has sent.
-	 * There may still be outstanding bulk-out requests. */
-	case DATA_DIR_FROM_HOST:
-		if (fsg->residue == 0)
-			;		// Nothing to receive
-
-		/* Did the host stop sending unexpectedly early? */
-		else if (fsg->short_packet_received) {
-			raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
-			rc = -EINTR;
-		}
-
-		/* We haven't processed all the incoming data.  Even though
-		 * we may be allowed to stall, doing so would cause a race.
-		 * The controller may already have ACK'ed all the remaining
-		 * bulk-out packets, in which case the host wouldn't see a
-		 * STALL.  Not realizing the endpoint was halted, it wouldn't
-		 * clear the halt -- leading to problems later on. */
-#if 0
-		else if (mod_data.can_stall) {
-			fsg_set_halt(fsg, fsg->bulk_out);
-			raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
-			rc = -EINTR;
-		}
-#endif
-
-		/* We can't stall.  Read in the excess data and throw it
-		 * all away. */
-		else
-			rc = throw_away_data(fsg);
-		break;
-	}
-	return rc;
-}
-
-
-static int send_status(struct fsg_dev *fsg)
-{
-	struct fsg_lun		*curlun = fsg->curlun;
-	struct fsg_buffhd	*bh;
-	int			rc;
-	u8			status = US_BULK_STAT_OK;
-	u32			sd, sdinfo = 0;
-
-	/* Wait for the next buffer to become available */
-	bh = fsg->next_buffhd_to_fill;
-	while (bh->state != BUF_STATE_EMPTY) {
-		rc = sleep_thread(fsg);
-		if (rc)
-			return rc;
-	}
-
-	if (curlun) {
-		sd = curlun->sense_data;
-		sdinfo = curlun->sense_data_info;
-	} else if (fsg->bad_lun_okay)
-		sd = SS_NO_SENSE;
-	else
-		sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
-
-	if (fsg->phase_error) {
-		DBG(fsg, "sending phase-error status\n");
-		status = US_BULK_STAT_PHASE;
-		sd = SS_INVALID_COMMAND;
-	} else if (sd != SS_NO_SENSE) {
-		DBG(fsg, "sending command-failure status\n");
-		status = US_BULK_STAT_FAIL;
-		VDBG(fsg, "  sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
-				"  info x%x\n",
-				SK(sd), ASC(sd), ASCQ(sd), sdinfo);
-	}
-
-	if (transport_is_bbb()) {
-		struct bulk_cs_wrap	*csw = bh->buf;
-
-		/* Store and send the Bulk-only CSW */
-		csw->Signature = cpu_to_le32(US_BULK_CS_SIGN);
-		csw->Tag = fsg->tag;
-		csw->Residue = cpu_to_le32(fsg->residue);
-		csw->Status = status;
-
-		bh->inreq->length = US_BULK_CS_WRAP_LEN;
-		bh->inreq->zero = 0;
-		start_transfer(fsg, fsg->bulk_in, bh->inreq,
-				&bh->inreq_busy, &bh->state);
-
-	} else if (mod_data.transport_type == USB_PR_CB) {
-
-		/* Control-Bulk transport has no status phase! */
-		return 0;
-
-	} else {			// USB_PR_CBI
-		struct interrupt_data	*buf = bh->buf;
-
-		/* Store and send the Interrupt data.  UFI sends the ASC
-		 * and ASCQ bytes.  Everything else sends a Type (which
-		 * is always 0) and the status Value. */
-		if (mod_data.protocol_type == USB_SC_UFI) {
-			buf->bType = ASC(sd);
-			buf->bValue = ASCQ(sd);
-		} else {
-			buf->bType = 0;
-			buf->bValue = status;
-		}
-		fsg->intreq->length = CBI_INTERRUPT_DATA_LEN;
-
-		fsg->intr_buffhd = bh;		// Point to the right buffhd
-		fsg->intreq->buf = bh->inreq->buf;
-		fsg->intreq->context = bh;
-		start_transfer(fsg, fsg->intr_in, fsg->intreq,
-				&fsg->intreq_busy, &bh->state);
-	}
-
-	fsg->next_buffhd_to_fill = bh->next;
-	return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Check whether the command is properly formed and whether its data size
- * and direction agree with the values we already have. */
-static int check_command(struct fsg_dev *fsg, int cmnd_size,
-		enum data_direction data_dir, unsigned int mask,
-		int needs_medium, const char *name)
-{
-	int			i;
-	int			lun = fsg->cmnd[1] >> 5;
-	static const char	dirletter[4] = {'u', 'o', 'i', 'n'};
-	char			hdlen[20];
-	struct fsg_lun		*curlun;
-
-	/* Adjust the expected cmnd_size for protocol encapsulation padding.
-	 * Transparent SCSI doesn't pad. */
-	if (protocol_is_scsi())
-		;
-
-	/* There's some disagreement as to whether RBC pads commands or not.
-	 * We'll play it safe and accept either form. */
-	else if (mod_data.protocol_type == USB_SC_RBC) {
-		if (fsg->cmnd_size == 12)
-			cmnd_size = 12;
-
-	/* All the other protocols pad to 12 bytes */
-	} else
-		cmnd_size = 12;
-
-	hdlen[0] = 0;
-	if (fsg->data_dir != DATA_DIR_UNKNOWN)
-		sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
-				fsg->data_size);
-	VDBG(fsg, "SCSI command: %s;  Dc=%d, D%c=%u;  Hc=%d%s\n",
-			name, cmnd_size, dirletter[(int) data_dir],
-			fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
-
-	/* We can't reply at all until we know the correct data direction
-	 * and size. */
-	if (fsg->data_size_from_cmnd == 0)
-		data_dir = DATA_DIR_NONE;
-	if (fsg->data_dir == DATA_DIR_UNKNOWN) {	// CB or CBI
-		fsg->data_dir = data_dir;
-		fsg->data_size = fsg->data_size_from_cmnd;
-
-	} else {					// Bulk-only
-		if (fsg->data_size < fsg->data_size_from_cmnd) {
-
-			/* Host data size < Device data size is a phase error.
-			 * Carry out the command, but only transfer as much
-			 * as we are allowed. */
-			fsg->data_size_from_cmnd = fsg->data_size;
-			fsg->phase_error = 1;
-		}
-	}
-	fsg->residue = fsg->usb_amount_left = fsg->data_size;
-
-	/* Conflicting data directions is a phase error */
-	if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
-		fsg->phase_error = 1;
-		return -EINVAL;
-	}
-
-	/* Verify the length of the command itself */
-	if (cmnd_size != fsg->cmnd_size) {
-
-		/* Special case workaround: There are plenty of buggy SCSI
-		 * implementations. Many have issues with cbw->Length
-		 * field passing a wrong command size. For those cases we
-		 * always try to work around the problem by using the length
-		 * sent by the host side provided it is at least as large
-		 * as the correct command length.
-		 * Examples of such cases would be MS-Windows, which issues
-		 * REQUEST SENSE with cbw->Length == 12 where it should
-		 * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and
-		 * REQUEST SENSE with cbw->Length == 10 where it should
-		 * be 6 as well.
-		 */
-		if (cmnd_size <= fsg->cmnd_size) {
-			DBG(fsg, "%s is buggy! Expected length %d "
-					"but we got %d\n", name,
-					cmnd_size, fsg->cmnd_size);
-			cmnd_size = fsg->cmnd_size;
-		} else {
-			fsg->phase_error = 1;
-			return -EINVAL;
-		}
-	}
-
-	/* Check that the LUN values are consistent */
-	if (transport_is_bbb()) {
-		if (fsg->lun != lun)
-			DBG(fsg, "using LUN %d from CBW, "
-					"not LUN %d from CDB\n",
-					fsg->lun, lun);
-	}
-
-	/* Check the LUN */
-	curlun = fsg->curlun;
-	if (curlun) {
-		if (fsg->cmnd[0] != REQUEST_SENSE) {
-			curlun->sense_data = SS_NO_SENSE;
-			curlun->sense_data_info = 0;
-			curlun->info_valid = 0;
-		}
-	} else {
-		fsg->bad_lun_okay = 0;
-
-		/* INQUIRY and REQUEST SENSE commands are explicitly allowed
-		 * to use unsupported LUNs; all others may not. */
-		if (fsg->cmnd[0] != INQUIRY &&
-				fsg->cmnd[0] != REQUEST_SENSE) {
-			DBG(fsg, "unsupported LUN %d\n", fsg->lun);
-			return -EINVAL;
-		}
-	}
-
-	/* If a unit attention condition exists, only INQUIRY and
-	 * REQUEST SENSE commands are allowed; anything else must fail. */
-	if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
-			fsg->cmnd[0] != INQUIRY &&
-			fsg->cmnd[0] != REQUEST_SENSE) {
-		curlun->sense_data = curlun->unit_attention_data;
-		curlun->unit_attention_data = SS_NO_SENSE;
-		return -EINVAL;
-	}
-
-	/* Check that only command bytes listed in the mask are non-zero */
-	fsg->cmnd[1] &= 0x1f;			// Mask away the LUN
-	for (i = 1; i < cmnd_size; ++i) {
-		if (fsg->cmnd[i] && !(mask & (1 << i))) {
-			if (curlun)
-				curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
-			return -EINVAL;
-		}
-	}
-
-	/* If the medium isn't mounted and the command needs to access
-	 * it, return an error. */
-	if (curlun && !fsg_lun_is_open(curlun) && needs_medium) {
-		curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-/* wrapper of check_command for data size in blocks handling */
-static int check_command_size_in_blocks(struct fsg_dev *fsg, int cmnd_size,
-		enum data_direction data_dir, unsigned int mask,
-		int needs_medium, const char *name)
-{
-	if (fsg->curlun)
-		fsg->data_size_from_cmnd <<= fsg->curlun->blkbits;
-	return check_command(fsg, cmnd_size, data_dir,
-			mask, needs_medium, name);
-}
-
-static int do_scsi_command(struct fsg_dev *fsg)
-{
-	struct fsg_buffhd	*bh;
-	int			rc;
-	int			reply = -EINVAL;
-	int			i;
-	static char		unknown[16];
-
-	dump_cdb(fsg);
-
-	/* Wait for the next buffer to become available for data or status */
-	bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
-	while (bh->state != BUF_STATE_EMPTY) {
-		rc = sleep_thread(fsg);
-		if (rc)
-			return rc;
-	}
-	fsg->phase_error = 0;
-	fsg->short_packet_received = 0;
-
-	down_read(&fsg->filesem);	// We're using the backing file
-	switch (fsg->cmnd[0]) {
-
-	case INQUIRY:
-		fsg->data_size_from_cmnd = fsg->cmnd[4];
-		if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
-				(1<<4), 0,
-				"INQUIRY")) == 0)
-			reply = do_inquiry(fsg, bh);
-		break;
-
-	case MODE_SELECT:
-		fsg->data_size_from_cmnd = fsg->cmnd[4];
-		if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
-				(1<<1) | (1<<4), 0,
-				"MODE SELECT(6)")) == 0)
-			reply = do_mode_select(fsg, bh);
-		break;
-
-	case MODE_SELECT_10:
-		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
-		if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
-				(1<<1) | (3<<7), 0,
-				"MODE SELECT(10)")) == 0)
-			reply = do_mode_select(fsg, bh);
-		break;
-
-	case MODE_SENSE:
-		fsg->data_size_from_cmnd = fsg->cmnd[4];
-		if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
-				(1<<1) | (1<<2) | (1<<4), 0,
-				"MODE SENSE(6)")) == 0)
-			reply = do_mode_sense(fsg, bh);
-		break;
-
-	case MODE_SENSE_10:
-		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
-		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
-				(1<<1) | (1<<2) | (3<<7), 0,
-				"MODE SENSE(10)")) == 0)
-			reply = do_mode_sense(fsg, bh);
-		break;
-
-	case ALLOW_MEDIUM_REMOVAL:
-		fsg->data_size_from_cmnd = 0;
-		if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
-				(1<<4), 0,
-				"PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
-			reply = do_prevent_allow(fsg);
-		break;
-
-	case READ_6:
-		i = fsg->cmnd[4];
-		fsg->data_size_from_cmnd = (i == 0) ? 256 : i;
-		if ((reply = check_command_size_in_blocks(fsg, 6,
-				DATA_DIR_TO_HOST,
-				(7<<1) | (1<<4), 1,
-				"READ(6)")) == 0)
-			reply = do_read(fsg);
-		break;
-
-	case READ_10:
-		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
-		if ((reply = check_command_size_in_blocks(fsg, 10,
-				DATA_DIR_TO_HOST,
-				(1<<1) | (0xf<<2) | (3<<7), 1,
-				"READ(10)")) == 0)
-			reply = do_read(fsg);
-		break;
-
-	case READ_12:
-		fsg->data_size_from_cmnd = get_unaligned_be32(&fsg->cmnd[6]);
-		if ((reply = check_command_size_in_blocks(fsg, 12,
-				DATA_DIR_TO_HOST,
-				(1<<1) | (0xf<<2) | (0xf<<6), 1,
-				"READ(12)")) == 0)
-			reply = do_read(fsg);
-		break;
-
-	case READ_CAPACITY:
-		fsg->data_size_from_cmnd = 8;
-		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
-				(0xf<<2) | (1<<8), 1,
-				"READ CAPACITY")) == 0)
-			reply = do_read_capacity(fsg, bh);
-		break;
-
-	case READ_HEADER:
-		if (!mod_data.cdrom)
-			goto unknown_cmnd;
-		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
-		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
-				(3<<7) | (0x1f<<1), 1,
-				"READ HEADER")) == 0)
-			reply = do_read_header(fsg, bh);
-		break;
-
-	case READ_TOC:
-		if (!mod_data.cdrom)
-			goto unknown_cmnd;
-		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
-		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
-				(7<<6) | (1<<1), 1,
-				"READ TOC")) == 0)
-			reply = do_read_toc(fsg, bh);
-		break;
-
-	case READ_FORMAT_CAPACITIES:
-		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
-		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
-				(3<<7), 1,
-				"READ FORMAT CAPACITIES")) == 0)
-			reply = do_read_format_capacities(fsg, bh);
-		break;
-
-	case REQUEST_SENSE:
-		fsg->data_size_from_cmnd = fsg->cmnd[4];
-		if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
-				(1<<4), 0,
-				"REQUEST SENSE")) == 0)
-			reply = do_request_sense(fsg, bh);
-		break;
-
-	case START_STOP:
-		fsg->data_size_from_cmnd = 0;
-		if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
-				(1<<1) | (1<<4), 0,
-				"START-STOP UNIT")) == 0)
-			reply = do_start_stop(fsg);
-		break;
-
-	case SYNCHRONIZE_CACHE:
-		fsg->data_size_from_cmnd = 0;
-		if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
-				(0xf<<2) | (3<<7), 1,
-				"SYNCHRONIZE CACHE")) == 0)
-			reply = do_synchronize_cache(fsg);
-		break;
-
-	case TEST_UNIT_READY:
-		fsg->data_size_from_cmnd = 0;
-		reply = check_command(fsg, 6, DATA_DIR_NONE,
-				0, 1,
-				"TEST UNIT READY");
-		break;
-
-	/* Although optional, this command is used by MS-Windows.  We
-	 * support a minimal version: BytChk must be 0. */
-	case VERIFY:
-		fsg->data_size_from_cmnd = 0;
-		if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
-				(1<<1) | (0xf<<2) | (3<<7), 1,
-				"VERIFY")) == 0)
-			reply = do_verify(fsg);
-		break;
-
-	case WRITE_6:
-		i = fsg->cmnd[4];
-		fsg->data_size_from_cmnd = (i == 0) ? 256 : i;
-		if ((reply = check_command_size_in_blocks(fsg, 6,
-				DATA_DIR_FROM_HOST,
-				(7<<1) | (1<<4), 1,
-				"WRITE(6)")) == 0)
-			reply = do_write(fsg);
-		break;
-
-	case WRITE_10:
-		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
-		if ((reply = check_command_size_in_blocks(fsg, 10,
-				DATA_DIR_FROM_HOST,
-				(1<<1) | (0xf<<2) | (3<<7), 1,
-				"WRITE(10)")) == 0)
-			reply = do_write(fsg);
-		break;
-
-	case WRITE_12:
-		fsg->data_size_from_cmnd = get_unaligned_be32(&fsg->cmnd[6]);
-		if ((reply = check_command_size_in_blocks(fsg, 12,
-				DATA_DIR_FROM_HOST,
-				(1<<1) | (0xf<<2) | (0xf<<6), 1,
-				"WRITE(12)")) == 0)
-			reply = do_write(fsg);
-		break;
-
-	/* Some mandatory commands that we recognize but don't implement.
-	 * They don't mean much in this setting.  It's left as an exercise
-	 * for anyone interested to implement RESERVE and RELEASE in terms
-	 * of Posix locks. */
-	case FORMAT_UNIT:
-	case RELEASE:
-	case RESERVE:
-	case SEND_DIAGNOSTIC:
-		// Fall through
-
-	default:
- unknown_cmnd:
-		fsg->data_size_from_cmnd = 0;
-		sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
-		if ((reply = check_command(fsg, fsg->cmnd_size,
-				DATA_DIR_UNKNOWN, ~0, 0, unknown)) == 0) {
-			fsg->curlun->sense_data = SS_INVALID_COMMAND;
-			reply = -EINVAL;
-		}
-		break;
-	}
-	up_read(&fsg->filesem);
-
-	if (reply == -EINTR || signal_pending(current))
-		return -EINTR;
-
-	/* Set up the single reply buffer for finish_reply() */
-	if (reply == -EINVAL)
-		reply = 0;		// Error reply length
-	if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
-		reply = min((u32) reply, fsg->data_size_from_cmnd);
-		bh->inreq->length = reply;
-		bh->state = BUF_STATE_FULL;
-		fsg->residue -= reply;
-	}				// Otherwise it's already set
-
-	return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct usb_request		*req = bh->outreq;
-	struct bulk_cb_wrap	*cbw = req->buf;
-
-	/* Was this a real packet?  Should it be ignored? */
-	if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags))
-		return -EINVAL;
-
-	/* Is the CBW valid? */
-	if (req->actual != US_BULK_CB_WRAP_LEN ||
-			cbw->Signature != cpu_to_le32(
-				US_BULK_CB_SIGN)) {
-		DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
-				req->actual,
-				le32_to_cpu(cbw->Signature));
-
-		/* The Bulk-only spec says we MUST stall the IN endpoint
-		 * (6.6.1), so it's unavoidable.  It also says we must
-		 * retain this state until the next reset, but there's
-		 * no way to tell the controller driver it should ignore
-		 * Clear-Feature(HALT) requests.
-		 *
-		 * We aren't required to halt the OUT endpoint; instead
-		 * we can simply accept and discard any data received
-		 * until the next reset. */
-		wedge_bulk_in_endpoint(fsg);
-		set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
-		return -EINVAL;
-	}
-
-	/* Is the CBW meaningful? */
-	if (cbw->Lun >= FSG_MAX_LUNS || cbw->Flags & ~US_BULK_FLAG_IN ||
-			cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) {
-		DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
-				"cmdlen %u\n",
-				cbw->Lun, cbw->Flags, cbw->Length);
-
-		/* We can do anything we want here, so let's stall the
-		 * bulk pipes if we are allowed to. */
-		if (mod_data.can_stall) {
-			fsg_set_halt(fsg, fsg->bulk_out);
-			halt_bulk_in_endpoint(fsg);
-		}
-		return -EINVAL;
-	}
-
-	/* Save the command for later */
-	fsg->cmnd_size = cbw->Length;
-	memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
-	if (cbw->Flags & US_BULK_FLAG_IN)
-		fsg->data_dir = DATA_DIR_TO_HOST;
-	else
-		fsg->data_dir = DATA_DIR_FROM_HOST;
-	fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
-	if (fsg->data_size == 0)
-		fsg->data_dir = DATA_DIR_NONE;
-	fsg->lun = cbw->Lun;
-	fsg->tag = cbw->Tag;
-	return 0;
-}
-
-
-static int get_next_command(struct fsg_dev *fsg)
-{
-	struct fsg_buffhd	*bh;
-	int			rc = 0;
-
-	if (transport_is_bbb()) {
-
-		/* Wait for the next buffer to become available */
-		bh = fsg->next_buffhd_to_fill;
-		while (bh->state != BUF_STATE_EMPTY) {
-			rc = sleep_thread(fsg);
-			if (rc)
-				return rc;
-		}
-
-		/* Queue a request to read a Bulk-only CBW */
-		set_bulk_out_req_length(fsg, bh, US_BULK_CB_WRAP_LEN);
-		start_transfer(fsg, fsg->bulk_out, bh->outreq,
-				&bh->outreq_busy, &bh->state);
-
-		/* We will drain the buffer in software, which means we
-		 * can reuse it for the next filling.  No need to advance
-		 * next_buffhd_to_fill. */
-
-		/* Wait for the CBW to arrive */
-		while (bh->state != BUF_STATE_FULL) {
-			rc = sleep_thread(fsg);
-			if (rc)
-				return rc;
-		}
-		smp_rmb();
-		rc = received_cbw(fsg, bh);
-		bh->state = BUF_STATE_EMPTY;
-
-	} else {		// USB_PR_CB or USB_PR_CBI
-
-		/* Wait for the next command to arrive */
-		while (fsg->cbbuf_cmnd_size == 0) {
-			rc = sleep_thread(fsg);
-			if (rc)
-				return rc;
-		}
-
-		/* Is the previous status interrupt request still busy?
-		 * The host is allowed to skip reading the status,
-		 * so we must cancel it. */
-		if (fsg->intreq_busy)
-			usb_ep_dequeue(fsg->intr_in, fsg->intreq);
-
-		/* Copy the command and mark the buffer empty */
-		fsg->data_dir = DATA_DIR_UNKNOWN;
-		spin_lock_irq(&fsg->lock);
-		fsg->cmnd_size = fsg->cbbuf_cmnd_size;
-		memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size);
-		fsg->cbbuf_cmnd_size = 0;
-		spin_unlock_irq(&fsg->lock);
-
-		/* Use LUN from the command */
-		fsg->lun = fsg->cmnd[1] >> 5;
-	}
-
-	/* Update current lun */
-	if (fsg->lun >= 0 && fsg->lun < fsg->nluns)
-		fsg->curlun = &fsg->luns[fsg->lun];
-	else
-		fsg->curlun = NULL;
-
-	return rc;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
-		const struct usb_endpoint_descriptor *d)
-{
-	int	rc;
-
-	ep->driver_data = fsg;
-	ep->desc = d;
-	rc = usb_ep_enable(ep);
-	if (rc)
-		ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
-	return rc;
-}
-
-static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
-		struct usb_request **preq)
-{
-	*preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
-	if (*preq)
-		return 0;
-	ERROR(fsg, "can't allocate request for %s\n", ep->name);
-	return -ENOMEM;
-}
-
-/*
- * Reset interface setting and re-init endpoint state (toggle etc).
- * Call with altsetting < 0 to disable the interface.  The only other
- * available altsetting is 0, which enables the interface.
- */
-static int do_set_interface(struct fsg_dev *fsg, int altsetting)
-{
-	int	rc = 0;
-	int	i;
-	const struct usb_endpoint_descriptor	*d;
-
-	if (fsg->running)
-		DBG(fsg, "reset interface\n");
-
-reset:
-	/* Deallocate the requests */
-	for (i = 0; i < fsg_num_buffers; ++i) {
-		struct fsg_buffhd *bh = &fsg->buffhds[i];
-
-		if (bh->inreq) {
-			usb_ep_free_request(fsg->bulk_in, bh->inreq);
-			bh->inreq = NULL;
-		}
-		if (bh->outreq) {
-			usb_ep_free_request(fsg->bulk_out, bh->outreq);
-			bh->outreq = NULL;
-		}
-	}
-	if (fsg->intreq) {
-		usb_ep_free_request(fsg->intr_in, fsg->intreq);
-		fsg->intreq = NULL;
-	}
-
-	/* Disable the endpoints */
-	if (fsg->bulk_in_enabled) {
-		usb_ep_disable(fsg->bulk_in);
-		fsg->bulk_in_enabled = 0;
-	}
-	if (fsg->bulk_out_enabled) {
-		usb_ep_disable(fsg->bulk_out);
-		fsg->bulk_out_enabled = 0;
-	}
-	if (fsg->intr_in_enabled) {
-		usb_ep_disable(fsg->intr_in);
-		fsg->intr_in_enabled = 0;
-	}
-
-	fsg->running = 0;
-	if (altsetting < 0 || rc != 0)
-		return rc;
-
-	DBG(fsg, "set interface %d\n", altsetting);
-
-	/* Enable the endpoints */
-	d = fsg_ep_desc(fsg->gadget,
-			&fsg_fs_bulk_in_desc, &fsg_hs_bulk_in_desc,
-			&fsg_ss_bulk_in_desc);
-	if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
-		goto reset;
-	fsg->bulk_in_enabled = 1;
-
-	d = fsg_ep_desc(fsg->gadget,
-			&fsg_fs_bulk_out_desc, &fsg_hs_bulk_out_desc,
-			&fsg_ss_bulk_out_desc);
-	if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
-		goto reset;
-	fsg->bulk_out_enabled = 1;
-	fsg->bulk_out_maxpacket = usb_endpoint_maxp(d);
-	clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
-
-	if (transport_is_cbi()) {
-		d = fsg_ep_desc(fsg->gadget,
-				&fsg_fs_intr_in_desc, &fsg_hs_intr_in_desc,
-				&fsg_ss_intr_in_desc);
-		if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0)
-			goto reset;
-		fsg->intr_in_enabled = 1;
-	}
-
-	/* Allocate the requests */
-	for (i = 0; i < fsg_num_buffers; ++i) {
-		struct fsg_buffhd	*bh = &fsg->buffhds[i];
-
-		if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
-			goto reset;
-		if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
-			goto reset;
-		bh->inreq->buf = bh->outreq->buf = bh->buf;
-		bh->inreq->context = bh->outreq->context = bh;
-		bh->inreq->complete = bulk_in_complete;
-		bh->outreq->complete = bulk_out_complete;
-	}
-	if (transport_is_cbi()) {
-		if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0)
-			goto reset;
-		fsg->intreq->complete = intr_in_complete;
-	}
-
-	fsg->running = 1;
-	for (i = 0; i < fsg->nluns; ++i)
-		fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
-	return rc;
-}
-
-
-/*
- * Change our operational configuration.  This code must agree with the code
- * that returns config descriptors, and with interface altsetting code.
- *
- * It's also responsible for power management interactions.  Some
- * configurations might not work with our current power sources.
- * For now we just assume the gadget is always self-powered.
- */
-static int do_set_config(struct fsg_dev *fsg, u8 new_config)
-{
-	int	rc = 0;
-
-	/* Disable the single interface */
-	if (fsg->config != 0) {
-		DBG(fsg, "reset config\n");
-		fsg->config = 0;
-		rc = do_set_interface(fsg, -1);
-	}
-
-	/* Enable the interface */
-	if (new_config != 0) {
-		fsg->config = new_config;
-		if ((rc = do_set_interface(fsg, 0)) != 0)
-			fsg->config = 0;	// Reset on errors
-		else
-			INFO(fsg, "%s config #%d\n",
-			     usb_speed_string(fsg->gadget->speed),
-			     fsg->config);
-	}
-	return rc;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static void handle_exception(struct fsg_dev *fsg)
-{
-	siginfo_t		info;
-	int			sig;
-	int			i;
-	int			num_active;
-	struct fsg_buffhd	*bh;
-	enum fsg_state		old_state;
-	u8			new_config;
-	struct fsg_lun		*curlun;
-	unsigned int		exception_req_tag;
-	int			rc;
-
-	/* Clear the existing signals.  Anything but SIGUSR1 is converted
-	 * into a high-priority EXIT exception. */
-	for (;;) {
-		sig = dequeue_signal_lock(current, &current->blocked, &info);
-		if (!sig)
-			break;
-		if (sig != SIGUSR1) {
-			if (fsg->state < FSG_STATE_EXIT)
-				DBG(fsg, "Main thread exiting on signal\n");
-			raise_exception(fsg, FSG_STATE_EXIT);
-		}
-	}
-
-	/* Cancel all the pending transfers */
-	if (fsg->intreq_busy)
-		usb_ep_dequeue(fsg->intr_in, fsg->intreq);
-	for (i = 0; i < fsg_num_buffers; ++i) {
-		bh = &fsg->buffhds[i];
-		if (bh->inreq_busy)
-			usb_ep_dequeue(fsg->bulk_in, bh->inreq);
-		if (bh->outreq_busy)
-			usb_ep_dequeue(fsg->bulk_out, bh->outreq);
-	}
-
-	/* Wait until everything is idle */
-	for (;;) {
-		num_active = fsg->intreq_busy;
-		for (i = 0; i < fsg_num_buffers; ++i) {
-			bh = &fsg->buffhds[i];
-			num_active += bh->inreq_busy + bh->outreq_busy;
-		}
-		if (num_active == 0)
-			break;
-		if (sleep_thread(fsg))
-			return;
-	}
-
-	/* Clear out the controller's fifos */
-	if (fsg->bulk_in_enabled)
-		usb_ep_fifo_flush(fsg->bulk_in);
-	if (fsg->bulk_out_enabled)
-		usb_ep_fifo_flush(fsg->bulk_out);
-	if (fsg->intr_in_enabled)
-		usb_ep_fifo_flush(fsg->intr_in);
-
-	/* Reset the I/O buffer states and pointers, the SCSI
-	 * state, and the exception.  Then invoke the handler. */
-	spin_lock_irq(&fsg->lock);
-
-	for (i = 0; i < fsg_num_buffers; ++i) {
-		bh = &fsg->buffhds[i];
-		bh->state = BUF_STATE_EMPTY;
-	}
-	fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
-			&fsg->buffhds[0];
-
-	exception_req_tag = fsg->exception_req_tag;
-	new_config = fsg->new_config;
-	old_state = fsg->state;
-
-	if (old_state == FSG_STATE_ABORT_BULK_OUT)
-		fsg->state = FSG_STATE_STATUS_PHASE;
-	else {
-		for (i = 0; i < fsg->nluns; ++i) {
-			curlun = &fsg->luns[i];
-			curlun->prevent_medium_removal = 0;
-			curlun->sense_data = curlun->unit_attention_data =
-					SS_NO_SENSE;
-			curlun->sense_data_info = 0;
-			curlun->info_valid = 0;
-		}
-		fsg->state = FSG_STATE_IDLE;
-	}
-	spin_unlock_irq(&fsg->lock);
-
-	/* Carry out any extra actions required for the exception */
-	switch (old_state) {
-	default:
-		break;
-
-	case FSG_STATE_ABORT_BULK_OUT:
-		send_status(fsg);
-		spin_lock_irq(&fsg->lock);
-		if (fsg->state == FSG_STATE_STATUS_PHASE)
-			fsg->state = FSG_STATE_IDLE;
-		spin_unlock_irq(&fsg->lock);
-		break;
-
-	case FSG_STATE_RESET:
-		/* In case we were forced against our will to halt a
-		 * bulk endpoint, clear the halt now.  (The SuperH UDC
-		 * requires this.) */
-		if (test_and_clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags))
-			usb_ep_clear_halt(fsg->bulk_in);
-
-		if (transport_is_bbb()) {
-			if (fsg->ep0_req_tag == exception_req_tag)
-				ep0_queue(fsg);	// Complete the status stage
-
-		} else if (transport_is_cbi())
-			send_status(fsg);	// Status by interrupt pipe
-
-		/* Technically this should go here, but it would only be
-		 * a waste of time.  Ditto for the INTERFACE_CHANGE and
-		 * CONFIG_CHANGE cases. */
-		// for (i = 0; i < fsg->nluns; ++i)
-		//	fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
-		break;
-
-	case FSG_STATE_INTERFACE_CHANGE:
-		rc = do_set_interface(fsg, 0);
-		if (fsg->ep0_req_tag != exception_req_tag)
-			break;
-		if (rc != 0)			// STALL on errors
-			fsg_set_halt(fsg, fsg->ep0);
-		else				// Complete the status stage
-			ep0_queue(fsg);
-		break;
-
-	case FSG_STATE_CONFIG_CHANGE:
-		rc = do_set_config(fsg, new_config);
-		if (fsg->ep0_req_tag != exception_req_tag)
-			break;
-		if (rc != 0)			// STALL on errors
-			fsg_set_halt(fsg, fsg->ep0);
-		else				// Complete the status stage
-			ep0_queue(fsg);
-		break;
-
-	case FSG_STATE_DISCONNECT:
-		for (i = 0; i < fsg->nluns; ++i)
-			fsg_lun_fsync_sub(fsg->luns + i);
-		do_set_config(fsg, 0);		// Unconfigured state
-		break;
-
-	case FSG_STATE_EXIT:
-	case FSG_STATE_TERMINATED:
-		do_set_config(fsg, 0);			// Free resources
-		spin_lock_irq(&fsg->lock);
-		fsg->state = FSG_STATE_TERMINATED;	// Stop the thread
-		spin_unlock_irq(&fsg->lock);
-		break;
-	}
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int fsg_main_thread(void *fsg_)
-{
-	struct fsg_dev		*fsg = fsg_;
-
-	/* Allow the thread to be killed by a signal, but set the signal mask
-	 * to block everything but INT, TERM, KILL, and USR1. */
-	allow_signal(SIGINT);
-	allow_signal(SIGTERM);
-	allow_signal(SIGKILL);
-	allow_signal(SIGUSR1);
-
-	/* Allow the thread to be frozen */
-	set_freezable();
-
-	/* Arrange for userspace references to be interpreted as kernel
-	 * pointers.  That way we can pass a kernel pointer to a routine
-	 * that expects a __user pointer and it will work okay. */
-	set_fs(get_ds());
-
-	/* The main loop */
-	while (fsg->state != FSG_STATE_TERMINATED) {
-		if (exception_in_progress(fsg) || signal_pending(current)) {
-			handle_exception(fsg);
-			continue;
-		}
-
-		if (!fsg->running) {
-			sleep_thread(fsg);
-			continue;
-		}
-
-		if (get_next_command(fsg))
-			continue;
-
-		spin_lock_irq(&fsg->lock);
-		if (!exception_in_progress(fsg))
-			fsg->state = FSG_STATE_DATA_PHASE;
-		spin_unlock_irq(&fsg->lock);
-
-		if (do_scsi_command(fsg) || finish_reply(fsg))
-			continue;
-
-		spin_lock_irq(&fsg->lock);
-		if (!exception_in_progress(fsg))
-			fsg->state = FSG_STATE_STATUS_PHASE;
-		spin_unlock_irq(&fsg->lock);
-
-		if (send_status(fsg))
-			continue;
-
-		spin_lock_irq(&fsg->lock);
-		if (!exception_in_progress(fsg))
-			fsg->state = FSG_STATE_IDLE;
-		spin_unlock_irq(&fsg->lock);
-		}
-
-	spin_lock_irq(&fsg->lock);
-	fsg->thread_task = NULL;
-	spin_unlock_irq(&fsg->lock);
-
-	/* If we are exiting because of a signal, unregister the
-	 * gadget driver. */
-	if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
-		usb_gadget_unregister_driver(&fsg_driver);
-
-	/* Let the unbind and cleanup routines know the thread has exited */
-	complete_and_exit(&fsg->thread_notifier, 0);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-
-/* The write permissions and store_xxx pointers are set in fsg_bind() */
-static DEVICE_ATTR(ro, 0444, fsg_show_ro, NULL);
-static DEVICE_ATTR(nofua, 0644, fsg_show_nofua, NULL);
-static DEVICE_ATTR(file, 0444, fsg_show_file, NULL);
-
-
-/*-------------------------------------------------------------------------*/
-
-static void fsg_release(struct kref *ref)
-{
-	struct fsg_dev	*fsg = container_of(ref, struct fsg_dev, ref);
-
-	kfree(fsg->luns);
-	kfree(fsg);
-}
-
-static void lun_release(struct device *dev)
-{
-	struct rw_semaphore	*filesem = dev_get_drvdata(dev);
-	struct fsg_dev		*fsg =
-		container_of(filesem, struct fsg_dev, filesem);
-
-	kref_put(&fsg->ref, fsg_release);
-}
-
-static void /* __init_or_exit */ fsg_unbind(struct usb_gadget *gadget)
-{
-	struct fsg_dev		*fsg = get_gadget_data(gadget);
-	int			i;
-	struct fsg_lun		*curlun;
-	struct usb_request	*req = fsg->ep0req;
-
-	DBG(fsg, "unbind\n");
-	clear_bit(REGISTERED, &fsg->atomic_bitflags);
-
-	/* If the thread isn't already dead, tell it to exit now */
-	if (fsg->state != FSG_STATE_TERMINATED) {
-		raise_exception(fsg, FSG_STATE_EXIT);
-		wait_for_completion(&fsg->thread_notifier);
-
-		/* The cleanup routine waits for this completion also */
-		complete(&fsg->thread_notifier);
-	}
-
-	/* Unregister the sysfs attribute files and the LUNs */
-	for (i = 0; i < fsg->nluns; ++i) {
-		curlun = &fsg->luns[i];
-		if (curlun->registered) {
-			device_remove_file(&curlun->dev, &dev_attr_nofua);
-			device_remove_file(&curlun->dev, &dev_attr_ro);
-			device_remove_file(&curlun->dev, &dev_attr_file);
-			fsg_lun_close(curlun);
-			device_unregister(&curlun->dev);
-			curlun->registered = 0;
-		}
-	}
-
-	/* Free the data buffers */
-	for (i = 0; i < fsg_num_buffers; ++i)
-		kfree(fsg->buffhds[i].buf);
-
-	/* Free the request and buffer for endpoint 0 */
-	if (req) {
-		kfree(req->buf);
-		usb_ep_free_request(fsg->ep0, req);
-	}
-
-	set_gadget_data(gadget, NULL);
-}
-
-
-static int __init check_parameters(struct fsg_dev *fsg)
-{
-	int	prot;
-
-	/* Store the default values */
-	mod_data.transport_type = USB_PR_BULK;
-	mod_data.transport_name = "Bulk-only";
-	mod_data.protocol_type = USB_SC_SCSI;
-	mod_data.protocol_name = "Transparent SCSI";
-
-	/* Some peripheral controllers are known not to be able to
-	 * halt bulk endpoints correctly.  If one of them is present,
-	 * disable stalls.
-	 */
-	if (gadget_is_at91(fsg->gadget))
-		mod_data.can_stall = 0;
-
-	if (mod_data.release == 0xffff)
-		mod_data.release = get_default_bcdDevice();
-
-	prot = simple_strtol(mod_data.protocol_parm, NULL, 0);
-
-#ifdef CONFIG_USB_FILE_STORAGE_TEST
-	if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) {
-		;		// Use default setting
-	} else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) {
-		mod_data.transport_type = USB_PR_CB;
-		mod_data.transport_name = "Control-Bulk";
-	} else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) {
-		mod_data.transport_type = USB_PR_CBI;
-		mod_data.transport_name = "Control-Bulk-Interrupt";
-	} else {
-		ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm);
-		return -EINVAL;
-	}
-
-	if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 ||
-			prot == USB_SC_SCSI) {
-		;		// Use default setting
-	} else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 ||
-			prot == USB_SC_RBC) {
-		mod_data.protocol_type = USB_SC_RBC;
-		mod_data.protocol_name = "RBC";
-	} else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 ||
-			strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 ||
-			prot == USB_SC_8020) {
-		mod_data.protocol_type = USB_SC_8020;
-		mod_data.protocol_name = "8020i (ATAPI)";
-	} else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 ||
-			prot == USB_SC_QIC) {
-		mod_data.protocol_type = USB_SC_QIC;
-		mod_data.protocol_name = "QIC-157";
-	} else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 ||
-			prot == USB_SC_UFI) {
-		mod_data.protocol_type = USB_SC_UFI;
-		mod_data.protocol_name = "UFI";
-	} else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 ||
-			prot == USB_SC_8070) {
-		mod_data.protocol_type = USB_SC_8070;
-		mod_data.protocol_name = "8070i";
-	} else {
-		ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm);
-		return -EINVAL;
-	}
-
-	mod_data.buflen &= PAGE_CACHE_MASK;
-	if (mod_data.buflen <= 0) {
-		ERROR(fsg, "invalid buflen\n");
-		return -ETOOSMALL;
-	}
-
-#endif /* CONFIG_USB_FILE_STORAGE_TEST */
-
-	/* Serial string handling.
-	 * On a real device, the serial string would be loaded
-	 * from permanent storage. */
-	if (mod_data.serial) {
-		const char *ch;
-		unsigned len = 0;
-
-		/* Sanity check :
-		 * The CB[I] specification limits the serial string to
-		 * 12 uppercase hexadecimal characters.
-		 * BBB need at least 12 uppercase hexadecimal characters,
-		 * with a maximum of 126. */
-		for (ch = mod_data.serial; *ch; ++ch) {
-			++len;
-			if ((*ch < '0' || *ch > '9') &&
-			    (*ch < 'A' || *ch > 'F')) { /* not uppercase hex */
-				WARNING(fsg,
-					"Invalid serial string character: %c\n",
-					*ch);
-				goto no_serial;
-			}
-		}
-		if (len > 126 ||
-		    (mod_data.transport_type == USB_PR_BULK && len < 12) ||
-		    (mod_data.transport_type != USB_PR_BULK && len > 12)) {
-			WARNING(fsg, "Invalid serial string length!\n");
-			goto no_serial;
-		}
-		fsg_strings[FSG_STRING_SERIAL - 1].s = mod_data.serial;
-	} else {
-		WARNING(fsg, "No serial-number string provided!\n");
- no_serial:
-		device_desc.iSerialNumber = 0;
-	}
-
-	return 0;
-}
-
-
-static int __init fsg_bind(struct usb_gadget *gadget,
-		struct usb_gadget_driver *driver)
-{
-	struct fsg_dev		*fsg = the_fsg;
-	int			rc;
-	int			i;
-	struct fsg_lun		*curlun;
-	struct usb_ep		*ep;
-	struct usb_request	*req;
-	char			*pathbuf, *p;
-
-	fsg->gadget = gadget;
-	set_gadget_data(gadget, fsg);
-	fsg->ep0 = gadget->ep0;
-	fsg->ep0->driver_data = fsg;
-
-	if ((rc = check_parameters(fsg)) != 0)
-		goto out;
-
-	if (mod_data.removable) {	// Enable the store_xxx attributes
-		dev_attr_file.attr.mode = 0644;
-		dev_attr_file.store = fsg_store_file;
-		if (!mod_data.cdrom) {
-			dev_attr_ro.attr.mode = 0644;
-			dev_attr_ro.store = fsg_store_ro;
-		}
-	}
-
-	/* Only for removable media? */
-	dev_attr_nofua.attr.mode = 0644;
-	dev_attr_nofua.store = fsg_store_nofua;
-
-	/* Find out how many LUNs there should be */
-	i = mod_data.nluns;
-	if (i == 0)
-		i = max(mod_data.num_filenames, 1u);
-	if (i > FSG_MAX_LUNS) {
-		ERROR(fsg, "invalid number of LUNs: %d\n", i);
-		rc = -EINVAL;
-		goto out;
-	}
-
-	/* Create the LUNs, open their backing files, and register the
-	 * LUN devices in sysfs. */
-	fsg->luns = kzalloc(i * sizeof(struct fsg_lun), GFP_KERNEL);
-	if (!fsg->luns) {
-		rc = -ENOMEM;
-		goto out;
-	}
-	fsg->nluns = i;
-
-	for (i = 0; i < fsg->nluns; ++i) {
-		curlun = &fsg->luns[i];
-		curlun->cdrom = !!mod_data.cdrom;
-		curlun->ro = mod_data.cdrom || mod_data.ro[i];
-		curlun->initially_ro = curlun->ro;
-		curlun->removable = mod_data.removable;
-		curlun->nofua = mod_data.nofua[i];
-		curlun->dev.release = lun_release;
-		curlun->dev.parent = &gadget->dev;
-		curlun->dev.driver = &fsg_driver.driver;
-		dev_set_drvdata(&curlun->dev, &fsg->filesem);
-		dev_set_name(&curlun->dev,"%s-lun%d",
-			     dev_name(&gadget->dev), i);
-
-		kref_get(&fsg->ref);
-		rc = device_register(&curlun->dev);
-		if (rc) {
-			INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
-			put_device(&curlun->dev);
-			goto out;
-		}
-		curlun->registered = 1;
-
-		rc = device_create_file(&curlun->dev, &dev_attr_ro);
-		if (rc)
-			goto out;
-		rc = device_create_file(&curlun->dev, &dev_attr_nofua);
-		if (rc)
-			goto out;
-		rc = device_create_file(&curlun->dev, &dev_attr_file);
-		if (rc)
-			goto out;
-
-		if (mod_data.file[i] && *mod_data.file[i]) {
-			rc = fsg_lun_open(curlun, mod_data.file[i]);
-			if (rc)
-				goto out;
-		} else if (!mod_data.removable) {
-			ERROR(fsg, "no file given for LUN%d\n", i);
-			rc = -EINVAL;
-			goto out;
-		}
-	}
-
-	/* Find all the endpoints we will use */
-	usb_ep_autoconfig_reset(gadget);
-	ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_in_desc);
-	if (!ep)
-		goto autoconf_fail;
-	ep->driver_data = fsg;		// claim the endpoint
-	fsg->bulk_in = ep;
-
-	ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_out_desc);
-	if (!ep)
-		goto autoconf_fail;
-	ep->driver_data = fsg;		// claim the endpoint
-	fsg->bulk_out = ep;
-
-	if (transport_is_cbi()) {
-		ep = usb_ep_autoconfig(gadget, &fsg_fs_intr_in_desc);
-		if (!ep)
-			goto autoconf_fail;
-		ep->driver_data = fsg;		// claim the endpoint
-		fsg->intr_in = ep;
-	}
-
-	/* Fix up the descriptors */
-	device_desc.idVendor = cpu_to_le16(mod_data.vendor);
-	device_desc.idProduct = cpu_to_le16(mod_data.product);
-	device_desc.bcdDevice = cpu_to_le16(mod_data.release);
-
-	i = (transport_is_cbi() ? 3 : 2);	// Number of endpoints
-	fsg_intf_desc.bNumEndpoints = i;
-	fsg_intf_desc.bInterfaceSubClass = mod_data.protocol_type;
-	fsg_intf_desc.bInterfaceProtocol = mod_data.transport_type;
-	fsg_fs_function[i + FSG_FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
-
-	if (gadget_is_dualspeed(gadget)) {
-		fsg_hs_function[i + FSG_HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
-
-		/* Assume endpoint addresses are the same for both speeds */
-		fsg_hs_bulk_in_desc.bEndpointAddress =
-			fsg_fs_bulk_in_desc.bEndpointAddress;
-		fsg_hs_bulk_out_desc.bEndpointAddress =
-			fsg_fs_bulk_out_desc.bEndpointAddress;
-		fsg_hs_intr_in_desc.bEndpointAddress =
-			fsg_fs_intr_in_desc.bEndpointAddress;
-	}
-
-	if (gadget_is_superspeed(gadget)) {
-		unsigned		max_burst;
-
-		fsg_ss_function[i + FSG_SS_FUNCTION_PRE_EP_ENTRIES] = NULL;
-
-		/* Calculate bMaxBurst, we know packet size is 1024 */
-		max_burst = min_t(unsigned, mod_data.buflen / 1024, 15);
-
-		/* Assume endpoint addresses are the same for both speeds */
-		fsg_ss_bulk_in_desc.bEndpointAddress =
-			fsg_fs_bulk_in_desc.bEndpointAddress;
-		fsg_ss_bulk_in_comp_desc.bMaxBurst = max_burst;
-
-		fsg_ss_bulk_out_desc.bEndpointAddress =
-			fsg_fs_bulk_out_desc.bEndpointAddress;
-		fsg_ss_bulk_out_comp_desc.bMaxBurst = max_burst;
-	}
-
-	if (gadget_is_otg(gadget))
-		fsg_otg_desc.bmAttributes |= USB_OTG_HNP;
-
-	rc = -ENOMEM;
-
-	/* Allocate the request and buffer for endpoint 0 */
-	fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL);
-	if (!req)
-		goto out;
-	req->buf = kmalloc(EP0_BUFSIZE, GFP_KERNEL);
-	if (!req->buf)
-		goto out;
-	req->complete = ep0_complete;
-
-	/* Allocate the data buffers */
-	for (i = 0; i < fsg_num_buffers; ++i) {
-		struct fsg_buffhd	*bh = &fsg->buffhds[i];
-
-		/* Allocate for the bulk-in endpoint.  We assume that
-		 * the buffer will also work with the bulk-out (and
-		 * interrupt-in) endpoint. */
-		bh->buf = kmalloc(mod_data.buflen, GFP_KERNEL);
-		if (!bh->buf)
-			goto out;
-		bh->next = bh + 1;
-	}
-	fsg->buffhds[fsg_num_buffers - 1].next = &fsg->buffhds[0];
-
-	/* This should reflect the actual gadget power source */
-	usb_gadget_set_selfpowered(gadget);
-
-	snprintf(fsg_string_manufacturer, sizeof fsg_string_manufacturer,
-			"%s %s with %s",
-			init_utsname()->sysname, init_utsname()->release,
-			gadget->name);
-
-	fsg->thread_task = kthread_create(fsg_main_thread, fsg,
-			"file-storage-gadget");
-	if (IS_ERR(fsg->thread_task)) {
-		rc = PTR_ERR(fsg->thread_task);
-		goto out;
-	}
-
-	INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
-	INFO(fsg, "NOTE: This driver is deprecated.  "
-			"Consider using g_mass_storage instead.\n");
-	INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
-
-	pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
-	for (i = 0; i < fsg->nluns; ++i) {
-		curlun = &fsg->luns[i];
-		if (fsg_lun_is_open(curlun)) {
-			p = NULL;
-			if (pathbuf) {
-				p = d_path(&curlun->filp->f_path,
-					   pathbuf, PATH_MAX);
-				if (IS_ERR(p))
-					p = NULL;
-			}
-			LINFO(curlun, "ro=%d, nofua=%d, file: %s\n",
-			      curlun->ro, curlun->nofua, (p ? p : "(error)"));
-		}
-	}
-	kfree(pathbuf);
-
-	DBG(fsg, "transport=%s (x%02x)\n",
-			mod_data.transport_name, mod_data.transport_type);
-	DBG(fsg, "protocol=%s (x%02x)\n",
-			mod_data.protocol_name, mod_data.protocol_type);
-	DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n",
-			mod_data.vendor, mod_data.product, mod_data.release);
-	DBG(fsg, "removable=%d, stall=%d, cdrom=%d, buflen=%u\n",
-			mod_data.removable, mod_data.can_stall,
-			mod_data.cdrom, mod_data.buflen);
-	DBG(fsg, "I/O thread pid: %d\n", task_pid_nr(fsg->thread_task));
-
-	set_bit(REGISTERED, &fsg->atomic_bitflags);
-
-	/* Tell the thread to start working */
-	wake_up_process(fsg->thread_task);
-	return 0;
-
-autoconf_fail:
-	ERROR(fsg, "unable to autoconfigure all endpoints\n");
-	rc = -ENOTSUPP;
-
-out:
-	fsg->state = FSG_STATE_TERMINATED;	// The thread is dead
-	fsg_unbind(gadget);
-	complete(&fsg->thread_notifier);
-	return rc;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static void fsg_suspend(struct usb_gadget *gadget)
-{
-	struct fsg_dev		*fsg = get_gadget_data(gadget);
-
-	DBG(fsg, "suspend\n");
-	set_bit(SUSPENDED, &fsg->atomic_bitflags);
-}
-
-static void fsg_resume(struct usb_gadget *gadget)
-{
-	struct fsg_dev		*fsg = get_gadget_data(gadget);
-
-	DBG(fsg, "resume\n");
-	clear_bit(SUSPENDED, &fsg->atomic_bitflags);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static __refdata struct usb_gadget_driver		fsg_driver = {
-	.max_speed	= USB_SPEED_SUPER,
-	.function	= (char *) fsg_string_product,
-	.bind		= fsg_bind,
-	.unbind		= fsg_unbind,
-	.disconnect	= fsg_disconnect,
-	.setup		= fsg_setup,
-	.suspend	= fsg_suspend,
-	.resume		= fsg_resume,
-
-	.driver		= {
-		.name		= DRIVER_NAME,
-		.owner		= THIS_MODULE,
-		// .release = ...
-		// .suspend = ...
-		// .resume = ...
-	},
-};
-
-
-static int __init fsg_alloc(void)
-{
-	struct fsg_dev		*fsg;
-
-	fsg = kzalloc(sizeof *fsg +
-		      fsg_num_buffers * sizeof *(fsg->buffhds), GFP_KERNEL);
-
-	if (!fsg)
-		return -ENOMEM;
-	spin_lock_init(&fsg->lock);
-	init_rwsem(&fsg->filesem);
-	kref_init(&fsg->ref);
-	init_completion(&fsg->thread_notifier);
-
-	the_fsg = fsg;
-	return 0;
-}
-
-
-static int __init fsg_init(void)
-{
-	int		rc;
-	struct fsg_dev	*fsg;
-
-	rc = fsg_num_buffers_validate();
-	if (rc != 0)
-		return rc;
-
-	if ((rc = fsg_alloc()) != 0)
-		return rc;
-	fsg = the_fsg;
-	rc = usb_gadget_probe_driver(&fsg_driver);
-	if (rc != 0)
-		kref_put(&fsg->ref, fsg_release);
-	return rc;
-}
-module_init(fsg_init);
-
-
-static void __exit fsg_cleanup(void)
-{
-	struct fsg_dev	*fsg = the_fsg;
-
-	/* Unregister the driver iff the thread hasn't already done so */
-	if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
-		usb_gadget_unregister_driver(&fsg_driver);
-
-	/* Wait for the thread to finish up */
-	wait_for_completion(&fsg->thread_notifier);
-
-	kref_put(&fsg->ref, fsg_release);
-}
-module_exit(fsg_cleanup);
diff --git a/drivers/usb/gadget/net2280.c b/drivers/usb/gadget/net2280.c
index ac335af154ba..708c0b55dcc8 100644
--- a/drivers/usb/gadget/net2280.c
+++ b/drivers/usb/gadget/net2280.c
@@ -9,7 +9,7 @@
  * CODE STATUS HIGHLIGHTS
  *
  * This driver should work well with most "gadget" drivers, including
- * the File Storage, Serial, and Ethernet/RNDIS gadget drivers
+ * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
  * as well as Gadget Zero and Gadgetfs.
  *
  * DMA is enabled by default.  Drivers using transfer queues might use
diff --git a/drivers/usb/gadget/pxa27x_udc.h b/drivers/usb/gadget/pxa27x_udc.h
index a1d268c6f2cc..79d81a4b2344 100644
--- a/drivers/usb/gadget/pxa27x_udc.h
+++ b/drivers/usb/gadget/pxa27x_udc.h
@@ -418,7 +418,7 @@ struct udc_stats {
  * @irq: udc irq
  * @clk: udc clock
  * @usb_gadget: udc gadget structure
- * @driver: bound gadget (zero, g_ether, g_file_storage, ...)
+ * @driver: bound gadget (zero, g_ether, g_mass_storage, ...)
  * @dev: device
  * @mach: machine info, used to activate specific GPIO
  * @transceiver: external transceiver to handle vbus sense and D+ pullup