USB: gadget: f_mass_storage: Integrate android customizations

Integrate support for android composite driver and platform data
within CONFIG_USB_ANDROID_MASS_STORAGE.

Signed-off-by: Mike Lockwood <lockwood@android.com>

3 files changed, 81 insertions, 3020 deletions

diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 216271aca82..f3a5061c93c 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -70,5 +70,5 @@ obj-$(CONFIG_USB_G_NCM)		+= g_ncm.o
 obj-$(CONFIG_USB_ANDROID)	+= android.o
 obj-$(CONFIG_USB_ANDROID_ACM)	+= f_acm.o u_serial.o
 obj-$(CONFIG_USB_ANDROID_ADB)	+= f_adb.o
-obj-$(CONFIG_USB_ANDROID_MASS_STORAGE)	+= f_mass_storage_tmp.o
+obj-$(CONFIG_USB_ANDROID_MASS_STORAGE)	+= f_mass_storage.o
 obj-$(CONFIG_USB_ANDROID_RNDIS)	+= f_rndis.o u_ether.o
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index efb58f9f5aa..a5d2f24a0d9 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -297,6 +297,12 @@
 
 #include "gadget_chips.h"
 
+#ifdef CONFIG_USB_ANDROID_MASS_STORAGE
+#include <linux/usb/android_composite.h>
+#include <linux/platform_device.h>
+
+#define FUNCTION_NAME		"usb_mass_storage"
+#endif
 
 /*------------------------------------------------------------------------*/
 
@@ -432,6 +438,10 @@ struct fsg_config {
 	u16 release;
 
 	char			can_stall;
+
+#ifdef CONFIG_USB_ANDROID_MASS_STORAGE
+	struct platform_device *pdev;
+#endif
 };
 
 struct fsg_dev {
@@ -2780,7 +2790,13 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
 		curlun->initially_ro = curlun->ro;
 		curlun->removable = lcfg->removable;
 		curlun->dev.release = fsg_lun_release;
+
+#ifdef CONFIG_USB_ANDROID_MASS_STORAGE
+		/* use "usb_mass_storage" platform device as parent */
+		curlun->dev.parent = &cfg->pdev->dev;
+#else
 		curlun->dev.parent = &gadget->dev;
+#endif
 		/* curlun->dev.driver = &fsg_driver.driver; XXX */
 		dev_set_drvdata(&curlun->dev, &common->filesem);
 		dev_set_name(&curlun->dev,
@@ -3052,7 +3068,11 @@ static int fsg_bind_config(struct usb_composite_dev *cdev,
 	if (unlikely(!fsg))
 		return -ENOMEM;
 
+#ifdef CONFIG_USB_ANDROID_MASS_STORAGE
+	fsg->function.name        = FUNCTION_NAME;
+#else
 	fsg->function.name        = FSG_DRIVER_DESC;
+#endif
 	fsg->function.strings     = fsg_strings_array;
 	fsg->function.bind        = fsg_bind;
 	fsg->function.unbind      = fsg_unbind;
@@ -3178,3 +3198,63 @@ fsg_common_from_params(struct fsg_common *common,
 	return fsg_common_init(common, cdev, &cfg);
 }
 
+#ifdef CONFIG_USB_ANDROID_MASS_STORAGE
+
+static struct fsg_config fsg_cfg;
+
+static int __init fsg_probe(struct platform_device *pdev)
+{
+	struct usb_mass_storage_platform_data *pdata = pdev->dev.platform_data;
+	int i, nluns;
+
+	printk(KERN_INFO "fsg_probe pdev: %p, pdata: %p\n", pdev, pdata);
+	if (!pdata)
+		return -1;
+
+	nluns = pdata->nluns;
+	if (nluns > FSG_MAX_LUNS)
+		nluns = FSG_MAX_LUNS;
+	fsg_cfg.nluns = nluns;
+	for (i = 0; i < nluns; i++)
+		fsg_cfg.luns[i].removable = 1;
+
+	fsg_cfg.vendor_name = pdata->vendor;
+	fsg_cfg.product_name = pdata->product;
+	fsg_cfg.release = pdata->release;
+	fsg_cfg.can_stall = 0;
+	fsg_cfg.pdev = pdev;
+
+	return 0;
+}
+
+static struct platform_driver fsg_platform_driver = {
+	.driver = { .name = FUNCTION_NAME, },
+	.probe = fsg_probe,
+};
+
+int mass_storage_bind_config(struct usb_configuration *c)
+{
+	struct fsg_common *common = fsg_common_init(NULL, c->cdev, &fsg_cfg);
+	if (IS_ERR(common))
+		return -1;
+	return fsg_add(c->cdev, c, common);
+}
+
+static struct android_usb_function mass_storage_function = {
+	.name = FUNCTION_NAME,
+	.bind_config = mass_storage_bind_config,
+};
+
+static int __init init(void)
+{
+	int		rc;
+	printk(KERN_INFO "f_mass_storage init\n");
+	rc = platform_driver_register(&fsg_platform_driver);
+	if (rc != 0)
+		return rc;
+	android_register_function(&mass_storage_function);
+	return 0;
+}module_init(init);
+
+#endif /* CONFIG_USB_ANDROID_MASS_STORAGE */
+
diff --git a/drivers/usb/gadget/f_mass_storage_tmp.c b/drivers/usb/gadget/f_mass_storage_tmp.c
deleted file mode 100644
index 14fd333ff90..00000000000
--- a/drivers/usb/gadget/f_mass_storage_tmp.c
+++ /dev/null
@@ -1,3019 +0,0 @@
-/*
- * drivers/usb/gadget/f_mass_storage.c
- *
- * Function Driver for USB Mass Storage
- *
- * Copyright (C) 2008 Google, Inc.
- * Author: Mike Lockwood <lockwood@android.com>
- *
- * Based heavily on the file_storage gadget driver in
- * drivers/usb/gadget/file_storage.c and licensed under the same terms:
- *
- * Copyright (C) 2003-2007 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.
- */
-
-/* #define DEBUG */
-/* #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/rwsem.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/string.h>
-#include <linux/switch.h>
-#include <linux/freezer.h>
-#include <linux/utsname.h>
-#include <linux/wakelock.h>
-#include <linux/platform_device.h>
-
-#include <linux/usb.h>
-#include <linux/usb_usual.h>
-#include <linux/usb/ch9.h>
-#include <linux/usb/android_composite.h>
-
-#include "gadget_chips.h"
-
-
-#define BULK_BUFFER_SIZE           4096
-
-/* flush after every 4 meg of writes to avoid excessive block level caching */
-#define MAX_UNFLUSHED_BYTES (4 * 1024 * 1024)
-
-/*-------------------------------------------------------------------------*/
-
-#define DRIVER_NAME		"usb_mass_storage"
-#define MAX_LUNS		8
-
-static const char shortname[] = DRIVER_NAME;
-
-#ifdef DEBUG
-#define LDBG(lun, fmt, args...) \
-	dev_dbg(&(lun)->dev , fmt , ## args)
-#define MDBG(fmt,args...) \
-	printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args)
-#else
-#define LDBG(lun, fmt, args...) \
-	do { } while (0)
-#define MDBG(fmt,args...) \
-	do { } while (0)
-#undef VERBOSE_DEBUG
-#undef DUMP_MSGS
-#endif /* DEBUG */
-
-#ifdef VERBOSE_DEBUG
-#define VLDBG	LDBG
-#else
-#define VLDBG(lun, fmt, args...) \
-	do { } while (0)
-#endif /* VERBOSE_DEBUG */
-
-#define LERROR(lun, fmt, args...) \
-	dev_err(&(lun)->dev , fmt , ## args)
-#define LWARN(lun, fmt, args...) \
-	dev_warn(&(lun)->dev , fmt , ## args)
-#define LINFO(lun, fmt, args...) \
-	dev_info(&(lun)->dev , fmt , ## args)
-
-#define MINFO(fmt,args...) \
-	printk(KERN_INFO DRIVER_NAME ": " fmt , ## args)
-
-#undef DBG
-#undef VDBG
-#undef ERROR
-#undef WARNING
-#undef INFO
-#define DBG(d, fmt, args...) \
-	dev_dbg(&(d)->cdev->gadget->dev , fmt , ## args)
-#define VDBG(d, fmt, args...) \
-	dev_vdbg(&(d)->cdev->gadget->dev , fmt , ## args)
-#define ERROR(d, fmt, args...) \
-	dev_err(&(d)->cdev->gadget->dev , fmt , ## args)
-#define WARNING(d, fmt, args...) \
-	dev_warn(&(d)->cdev->gadget->dev , fmt , ## args)
-#define INFO(d, fmt, args...) \
-	dev_info(&(d)->cdev->gadget->dev , fmt , ## args)
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Bulk-only data structures */
-
-/* Command Block Wrapper */
-struct bulk_cb_wrap {
-	__le32	Signature;		/* Contains 'USBC' */
-	u32	Tag;			/* Unique per command id */
-	__le32	DataTransferLength;	/* Size of the data */
-	u8	Flags;			/* Direction in bit 7 */
-	u8	Lun;			/* LUN (normally 0) */
-	u8	Length;			/* Of the CDB, <= MAX_COMMAND_SIZE */
-	u8	CDB[16];		/* Command Data Block */
-};
-
-#define USB_BULK_CB_WRAP_LEN	31
-#define USB_BULK_CB_SIG		0x43425355	/* Spells out USBC */
-#define USB_BULK_IN_FLAG	0x80
-
-/* Command Status Wrapper */
-struct bulk_cs_wrap {
-	__le32	Signature;		/* Should = 'USBS' */
-	u32	Tag;			/* Same as original command */
-	__le32	Residue;		/* Amount not transferred */
-	u8	Status;			/* See below */
-};
-
-#define USB_BULK_CS_WRAP_LEN	13
-#define USB_BULK_CS_SIG		0x53425355	/* Spells out 'USBS' */
-#define USB_STATUS_PASS		0
-#define USB_STATUS_FAIL		1
-#define USB_STATUS_PHASE_ERROR	2
-
-/* Bulk-only class specific requests */
-#define USB_BULK_RESET_REQUEST		0xff
-#define USB_BULK_GET_MAX_LUN_REQUEST	0xfe
-
-/* Length of a SCSI Command Data Block */
-#define MAX_COMMAND_SIZE	16
-
-/* SCSI commands that we recognize */
-#define SC_FORMAT_UNIT			0x04
-#define SC_INQUIRY			0x12
-#define SC_MODE_SELECT_6		0x15
-#define SC_MODE_SELECT_10		0x55
-#define SC_MODE_SENSE_6			0x1a
-#define SC_MODE_SENSE_10		0x5a
-#define SC_PREVENT_ALLOW_MEDIUM_REMOVAL	0x1e
-#define SC_READ_6			0x08
-#define SC_READ_10			0x28
-#define SC_READ_12			0xa8
-#define SC_READ_CAPACITY		0x25
-#define SC_READ_FORMAT_CAPACITIES	0x23
-#define SC_RELEASE			0x17
-#define SC_REQUEST_SENSE		0x03
-#define SC_RESERVE			0x16
-#define SC_SEND_DIAGNOSTIC		0x1d
-#define SC_START_STOP_UNIT		0x1b
-#define SC_SYNCHRONIZE_CACHE		0x35
-#define SC_TEST_UNIT_READY		0x00
-#define SC_VERIFY			0x2f
-#define SC_WRITE_6			0x0a
-#define SC_WRITE_10			0x2a
-#define SC_WRITE_12			0xaa
-
-/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
-#define SS_NO_SENSE				0
-#define SS_COMMUNICATION_FAILURE		0x040800
-#define SS_INVALID_COMMAND			0x052000
-#define SS_INVALID_FIELD_IN_CDB			0x052400
-#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE	0x052100
-#define SS_LOGICAL_UNIT_NOT_SUPPORTED		0x052500
-#define SS_MEDIUM_NOT_PRESENT			0x023a00
-#define SS_MEDIUM_REMOVAL_PREVENTED		0x055302
-#define SS_NOT_READY_TO_READY_TRANSITION	0x062800
-#define SS_RESET_OCCURRED			0x062900
-#define SS_SAVING_PARAMETERS_NOT_SUPPORTED	0x053900
-#define SS_UNRECOVERED_READ_ERROR		0x031100
-#define SS_WRITE_ERROR				0x030c02
-#define SS_WRITE_PROTECTED			0x072700
-
-#define SK(x)		((u8) ((x) >> 16))	/* Sense Key byte, etc. */
-#define ASC(x)		((u8) ((x) >> 8))
-#define ASCQ(x)		((u8) (x))
-
-
-/*-------------------------------------------------------------------------*/
-
-struct lun {
-	struct file	*filp;
-	loff_t		file_length;
-	loff_t		num_sectors;
-	unsigned int unflushed_bytes;
-
-	unsigned int	ro : 1;
-	unsigned int	prevent_medium_removal : 1;
-	unsigned int	registered : 1;
-	unsigned int	info_valid : 1;
-
-	u32		sense_data;
-	u32		sense_data_info;
-	u32		unit_attention_data;
-
-	struct device	dev;
-};
-
-#define backing_file_is_open(curlun)	((curlun)->filp != NULL)
-
-
-static struct lun *dev_to_lun(struct device *dev)
-{
-	return container_of(dev, struct lun, dev);
-}
-
-/* Big enough to hold our biggest descriptor */
-#define EP0_BUFSIZE	256
-
-/* Number of buffers we will use.  2 is enough for double-buffering */
-#define NUM_BUFFERS	2
-
-enum fsg_buffer_state {
-	BUF_STATE_EMPTY = 0,
-	BUF_STATE_FULL,
-	BUF_STATE_BUSY
-};
-
-struct fsg_buffhd {
-	void				*buf;
-	enum fsg_buffer_state		state;
-	struct fsg_buffhd		*next;
-
-	/* The NetChip 2280 is faster, and handles some protocol faults
-	 * better, if we don't submit any short bulk-out read requests.
-	 * So we will record the intended request length here. */
-	unsigned int			bulk_out_intended_length;
-
-	struct usb_request		*inreq;
-	int				inreq_busy;
-	struct usb_request		*outreq;
-	int				outreq_busy;
-};
-
-enum fsg_state {
-	/* This one isn't used anywhere */
-	FSG_STATE_COMMAND_PHASE = -10,
-
-	FSG_STATE_DATA_PHASE,
-	FSG_STATE_STATUS_PHASE,
-
-	FSG_STATE_IDLE = 0,
-	FSG_STATE_ABORT_BULK_OUT,
-	FSG_STATE_RESET,
-	FSG_STATE_CONFIG_CHANGE,
-	FSG_STATE_EXIT,
-	FSG_STATE_TERMINATED
-};
-
-enum data_direction {
-	DATA_DIR_UNKNOWN = 0,
-	DATA_DIR_FROM_HOST,
-	DATA_DIR_TO_HOST,
-	DATA_DIR_NONE
-};
-
-struct fsg_dev {
-	struct usb_function function;
-	struct usb_composite_dev *cdev;
-
-	/* optional "usb_mass_storage" platform device */
-	struct platform_device *pdev;
-
-	/* lock protects: state and all the req_busy's */
-	spinlock_t		lock;
-
-	/* filesem protects: backing files in use */
-	struct rw_semaphore	filesem;
-
-	/* reference counting: wait until all LUNs are released */
-	struct kref		ref;
-
-	unsigned int		bulk_out_maxpacket;
-	enum fsg_state		state;		/* For exception handling */
-
-	u8			config, new_config;
-
-	unsigned int		running : 1;
-	unsigned int		bulk_in_enabled : 1;
-	unsigned int		bulk_out_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 CLEAR_BULK_HALTS	1
-#define SUSPENDED		2
-
-	struct usb_ep		*bulk_in;
-	struct usb_ep		*bulk_out;
-
-	struct fsg_buffhd	*next_buffhd_to_fill;
-	struct fsg_buffhd	*next_buffhd_to_drain;
-	struct fsg_buffhd	buffhds[NUM_BUFFERS];
-
-	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;
-
-	unsigned int		nluns;
-	struct lun		*luns;
-	struct lun		*curlun;
-
-	u32				buf_size;
-	const char		*vendor;
-	const char		*product;
-	int				release;
-
-	struct switch_dev sdev;
-
-	struct wake_lock wake_lock;
-};
-
-static inline struct fsg_dev *func_to_dev(struct usb_function *f)
-{
-	return container_of(f, struct fsg_dev, function);
-}
-
-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 void	close_backing_file(struct fsg_dev *fsg, struct lun *curlun);
-static void	close_all_backing_files(struct fsg_dev *fsg);
-static int fsync_sub(struct lun *curlun);
-
-/*-------------------------------------------------------------------------*/
-
-#ifdef DUMP_MSGS
-
-static void dump_msg(struct fsg_dev *fsg, const char *label,
-		const u8 *buf, unsigned int length)
-{
-	if (length < 512) {
-		DBG(fsg, "%s, length %u:\n", label, length);
-		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
-				16, 1, buf, length, 0);
-	}
-}
-
-static void dump_cdb(struct fsg_dev *fsg)
-{}
-
-#else
-
-static void dump_msg(struct fsg_dev *fsg, const char *label,
-		const u8 *buf, unsigned int length)
-{}
-
-#ifdef VERBOSE_DEBUG
-
-static void dump_cdb(struct fsg_dev *fsg)
-{
-	print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE,
-			16, 1, fsg->cmnd, fsg->cmnd_size, 0);
-}
-
-#else
-
-static void dump_cdb(struct fsg_dev *fsg)
-{}
-
-#endif /* VERBOSE_DEBUG */
-#endif /* DUMP_MSGS */
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Routines for unaligned data access */
-
-static u16 get_be16(u8 *buf)
-{
-	return ((u16) buf[0] << 8) | ((u16) buf[1]);
-}
-
-static u32 get_be32(u8 *buf)
-{
-	return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
-			((u32) buf[2] << 8) | ((u32) buf[3]);
-}
-
-static void put_be16(u8 *buf, u16 val)
-{
-	buf[0] = val >> 8;
-	buf[1] = val;
-}
-
-static void put_be32(u8 *buf, u32 val)
-{
-	buf[0] = val >> 24;
-	buf[1] = val >> 16;
-	buf[2] = val >> 8;
-	buf[3] = val & 0xff;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * 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 interface. */
-
-static struct usb_interface_descriptor
-intf_desc = {
-	.bLength =		sizeof intf_desc,
-	.bDescriptorType =	USB_DT_INTERFACE,
-
-	.bNumEndpoints =	2,		/* Adjusted during fsg_bind() */
-	.bInterfaceClass =	USB_CLASS_MASS_STORAGE,
-	.bInterfaceSubClass =	US_SC_SCSI,
-	.bInterfaceProtocol =	US_PR_BULK,
-};
-
-/* Three full-speed endpoint descriptors: bulk-in, bulk-out,
- * and interrupt-in. */
-
-static struct usb_endpoint_descriptor
-fs_bulk_in_desc = {
-	.bLength =		USB_DT_ENDPOINT_SIZE,
-	.bDescriptorType =	USB_DT_ENDPOINT,
-
-	.bEndpointAddress =	USB_DIR_IN,
-	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
-	/* wMaxPacketSize set by autoconfiguration */
-};
-
-static struct usb_endpoint_descriptor
-fs_bulk_out_desc = {
-	.bLength =		USB_DT_ENDPOINT_SIZE,
-	.bDescriptorType =	USB_DT_ENDPOINT,
-
-	.bEndpointAddress =	USB_DIR_OUT,
-	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
-	/* wMaxPacketSize set by autoconfiguration */
-};
-
-static struct usb_descriptor_header *fs_function[] = {
-	(struct usb_descriptor_header *) &intf_desc,
-	(struct usb_descriptor_header *) &fs_bulk_in_desc,
-	(struct usb_descriptor_header *) &fs_bulk_out_desc,
-	NULL,
-};
-#define FS_FUNCTION_PRE_EP_ENTRIES	2
-
-
-static struct usb_endpoint_descriptor
-hs_bulk_in_desc = {
-	.bLength =		USB_DT_ENDPOINT_SIZE,
-	.bDescriptorType =	USB_DT_ENDPOINT,
-
-	/* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
-	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
-	.wMaxPacketSize =	__constant_cpu_to_le16(512),
-};
-
-static struct usb_endpoint_descriptor
-hs_bulk_out_desc = {
-	.bLength =		USB_DT_ENDPOINT_SIZE,
-	.bDescriptorType =	USB_DT_ENDPOINT,
-
-	/* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
-	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
-	.wMaxPacketSize =	__constant_cpu_to_le16(512),
-	.bInterval =		1,	/* NAK every 1 uframe */
-};
-
-
-static struct usb_descriptor_header *hs_function[] = {
-	(struct usb_descriptor_header *) &intf_desc,
-	(struct usb_descriptor_header *) &hs_bulk_in_desc,
-	(struct usb_descriptor_header *) &hs_bulk_out_desc,
-	NULL,
-};
-
-/* Maxpacket and other transfer characteristics vary by speed. */
-static struct usb_endpoint_descriptor *
-ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
-		struct usb_endpoint_descriptor *hs)
-{
-	if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
-		return hs;
-	return fs;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* 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;
-
-	DBG(fsg, "raise_exception %d\n", (int)new_state);
-	/* 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->state = new_state;
-		if (fsg->thread_task)
-			send_sig_info(SIGUSR1, SEND_SIG_FORCED,
-					fsg->thread_task);
-	}
-	spin_unlock_irqrestore(&fsg->lock, flags);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* 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;
-	unsigned long		flags;
-
-	if (req->status || req->actual != req->length)
-		DBG(fsg, "%s --> %d, %u/%u\n", __func__,
-				req->status, req->actual, req->length);
-
-	/* Hold the lock while we update the request and buffer states */
-	smp_wmb();
-	spin_lock_irqsave(&fsg->lock, flags);
-	bh->inreq_busy = 0;
-	bh->state = BUF_STATE_EMPTY;
-	wakeup_thread(fsg);
-	spin_unlock_irqrestore(&fsg->lock, flags);
-}
-
-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;
-	unsigned long		flags;
-
-	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);
-
-	/* Hold the lock while we update the request and buffer states */
-	smp_wmb();
-	spin_lock_irqsave(&fsg->lock, flags);
-	bh->outreq_busy = 0;
-	bh->state = BUF_STATE_FULL;
-	wakeup_thread(fsg);
-	spin_unlock_irqrestore(&fsg->lock, flags);
-}
-
-static int fsg_function_setup(struct usb_function *f,
-					const struct usb_ctrlrequest *ctrl)
-{
-	struct fsg_dev	*fsg = func_to_dev(f);
-	struct usb_composite_dev *cdev = fsg->cdev;
-	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);
-
-	DBG(fsg, "fsg_function_setup\n");
-	/* Handle Bulk-only class-specific requests */
-	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
-	DBG(fsg, "USB_TYPE_CLASS\n");
-		switch (ctrl->bRequest) {
-		case USB_BULK_RESET_REQUEST:
-			if (ctrl->bRequestType != (USB_DIR_OUT |
-					USB_TYPE_CLASS | USB_RECIP_INTERFACE))
-				break;
-			if (w_index != 0 || w_value != 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 = 0;
-			break;
-
-		case USB_BULK_GET_MAX_LUN_REQUEST:
-			if (ctrl->bRequestType != (USB_DIR_IN |
-					USB_TYPE_CLASS | USB_RECIP_INTERFACE))
-				break;
-			if (w_index != 0 || w_value != 0) {
-				value = -EDOM;
-				break;
-			}
-			VDBG(fsg, "get max LUN\n");
-			*(u8 *)cdev->req->buf = fsg->nluns - 1;
-			value = 1;
-			break;
-		}
-	}
-
-		/* respond with data transfer or status phase? */
-		if (value >= 0) {
-			int rc;
-			cdev->req->zero = value < w_length;
-			cdev->req->length = value;
-			rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
-			if (rc < 0)
-				printk("%s setup response queue error\n", __func__);
-		}
-
-	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;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* 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;
-	unsigned long		flags;
-
-	DBG(fsg, "start_transfer req: %p, req->buf: %p\n", req, req->buf);
-	if (ep == fsg->bulk_in)
-		dump_msg(fsg, "bulk-in", req->buf, req->length);
-
-	spin_lock_irqsave(&fsg->lock, flags);
-	*pbusy = 1;
-	*state = BUF_STATE_BUSY;
-	spin_unlock_irqrestore(&fsg->lock, flags);
-	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))
-			WARN(fsg, "error in submission: %s --> %d\n",
-				(ep == fsg->bulk_in ? "bulk-in" : "bulk-out"),
-				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 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;
-	unsigned int		partial_page;
-	ssize_t			nread;
-
-	/* Get the starting Logical Block Address and check that it's
-	 * not too big */
-	if (fsg->cmnd[0] == SC_READ_6)
-		lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
-	else {
-		lba = get_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) << 9;
-
-	/* 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.
-		 * Finally, if we're not at a page boundary, don't read past
-		 *	the next page.
-		 * If this means reading 0 then we were asked to read past
-		 *	the end of file. */
-		amount = min((unsigned int) amount_left,
-				(unsigned int)fsg->buf_size);
-		amount = min((loff_t) amount,
-				curlun->file_length - file_offset);
-		partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
-		if (partial_page > 0)
-			amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
-					partial_page);
-
-		/* 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 >> 9;
-			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 -= (nread & 511);	/* Round down to a block */
-		}
-		file_offset  += nread;
-		amount_left  -= nread;
-		fsg->residue -= nread;
-		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 >> 9;
-			curlun->info_valid = 1;
-			break;
-		}
-
-		if (amount_left == 0)
-			break;		/* No more left to read */
-
-		/* Send this buffer and go read some more */
-		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 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;
-	unsigned int		partial_page;
-	ssize_t			nwritten;
-	int			rc;
-
-	if (curlun->ro) {
-		curlun->sense_data = SS_WRITE_PROTECTED;
-		return -EINVAL;
-	}
-	curlun->filp->f_flags &= ~O_SYNC;	/* Default is not to wait */
-
-	/* Get the starting Logical Block Address and check that it's
-	 * not too big */
-	if (fsg->cmnd[0] == SC_WRITE_6)
-		lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
-	else {
-		lba = get_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;
-		}
-		if (fsg->cmnd[1] & 0x08)	/* FUA */
-			curlun->filp->f_flags |= O_SYNC;
-	}
-	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) << 9;
-	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 don't get more than the buffer size.
-			 * And don't try to go past the end of the file.
-			 * If we're not at a page boundary,
-			 *	don't go past the next page.
-			 * If this means getting 0, then we were asked
-			 *	to write past the end of file.
-			 * Finally, round down to a block boundary. */
-			amount = min(amount_left_to_req, (u32)fsg->buf_size);
-			amount = min((loff_t) amount, curlun->file_length -
-					usb_offset);
-			partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
-			if (partial_page > 0)
-				amount = min(amount,
-	(unsigned int) PAGE_CACHE_SIZE - partial_page);
-
-			if (amount == 0) {
-				get_some_more = 0;
-				curlun->sense_data =
-					SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
-				curlun->sense_data_info = usb_offset >> 9;
-				curlun->info_valid = 1;
-				continue;
-			}
-			amount -= (amount & 511);
-			if (amount == 0) {
-
-				/* Why were we were asked to transfer a
-				 * partial block? */
-				get_some_more = 0;
-				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;
-
-			/* amount is always divisible by 512, hence by
-			 * the bulk-out maxpacket size */
-			bh->outreq->length = bh->bulk_out_intended_length =
-					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 >> 9;
-				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;
-			}
-
-			/* 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 -= (nwritten & 511);
-						/* Round down to a block */
-			}
-			file_offset += nwritten;
-			amount_left_to_write -= nwritten;
-			fsg->residue -= nwritten;
-
-#ifdef MAX_UNFLUSHED_BYTES
-			curlun->unflushed_bytes += nwritten;
-			if (curlun->unflushed_bytes >= MAX_UNFLUSHED_BYTES) {
-				fsync_sub(curlun);
-				curlun->unflushed_bytes = 0;
-			}
-#endif
-			/* If an error occurred, report it and its position */
-			if (nwritten < amount) {
-				curlun->sense_data = SS_WRITE_ERROR;
-				curlun->sense_data_info = file_offset >> 9;
-				curlun->info_valid = 1;
-				break;
-			}
-
-			/* Did the host decide to stop early? */
-			if (bh->outreq->actual != bh->outreq->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 */
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Sync the file data, don't bother with the metadata.
- * The caller must own fsg->filesem.
- * This code was copied from fs/buffer.c:sys_fdatasync(). */
-static int fsync_sub(struct lun *curlun)
-{
-	struct file	*filp = curlun->filp;
-	struct inode	*inode;
-	int		rc, err;
-
-	if (curlun->ro || !filp)
-		return 0;
-	if (!filp->f_op->fsync)
-		return -EINVAL;
-
-	inode = filp->f_path.dentry->d_inode;
-	mutex_lock(&inode->i_mutex);
-	rc = filemap_fdatawrite(inode->i_mapping);
-	err = filp->f_op->fsync(filp, 1);
-	if (!rc)
-		rc = err;
-	err = filemap_fdatawait(inode->i_mapping);
-	if (!rc)
-		rc = err;
-	mutex_unlock(&inode->i_mutex);
-	VLDBG(curlun, "fdatasync -> %d\n", rc);
-	return rc;
-}
-
-static void fsync_all(struct fsg_dev *fsg)
-{
-	int	i;
-
-	for (i = 0; i < fsg->nluns; ++i)
-		fsync_sub(&fsg->luns[i]);
-}
-
-static int do_synchronize_cache(struct fsg_dev *fsg)
-{
-	struct lun	*curlun = fsg->curlun;
-	int		rc;
-
-	/* We ignore the requested LBA and write out all file's
-	 * dirty data buffers. */
-	rc = fsync_sub(curlun);
-	if (rc)
-		curlun->sense_data = SS_WRITE_ERROR;
-	return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static void invalidate_sub(struct 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_inode_pages -> %ld\n", rc);
-}
-
-static int do_verify(struct fsg_dev *fsg)
-{
-	struct 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_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_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 << 9;
-	file_offset = ((loff_t) lba) << 9;
-
-	/* Write out all the dirty buffers before invalidating them */
-	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.
-		 * If this means reading 0 then we were asked to read
-		 * past the end of file. */
-		amount = min((unsigned int) amount_left,
-				(unsigned int)fsg->buf_size);
-		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 >> 9;
-			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 -= (nread & 511);	/* Round down to a sector */
-		}
-		if (nread == 0) {
-			curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
-			curlun->sense_data_info = file_offset >> 9;
-			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;
-
-	if (!fsg->curlun) {		/* Unsupported LUNs are okay */
-		fsg->bad_lun_okay = 1;
-		memset(buf, 0, 36);
-		buf[0] = 0x7f;		/* Unsupported, no device-type */
-		return 36;
-	}
-
-	memset(buf, 0, 8);	/* Non-removable, direct-access device */
-
-	buf[1] = 0x80;	/* set removable bit */
-	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", fsg->vendor,
-			fsg->product, fsg->release);
-	return 36;
-}
-
-
-static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct 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_be32(&buf[3], sdinfo);		/* 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 lun	*curlun = fsg->curlun;
-	u32		lba = get_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_be32(&buf[0], curlun->num_sectors - 1);	/* Max logical block */
-	put_be32(&buf[4], 512);				/* Block length */
-	return 8;
-}
-
-
-static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct 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 == SC_MODE_SENSE_6) {
-		buf[2] = (curlun->ro ? 0x80 : 0x00);		/* WP, DPOFUA */
-		buf += 4;
-		limit = 255;
-	} else {			/* SC_MODE_SENSE_10 */
-		buf[3] = (curlun->ro ? 0x80 : 0x00);		/* WP, DPOFUA */
-		buf += 8;
-		limit = 65535;
-	}
-
-	/* No block descriptors */
-
-	/* Disabled to workaround USB reset problems with a Vista host.
-	 */
-#if 0
-	/* 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_be16(&buf[4], 0xffff);  /* Don't disable prefetch */
-					/* Minimum prefetch = 0 */
-			put_be16(&buf[8], 0xffff);  /* Maximum prefetch */
-			/* Maximum prefetch ceiling */
-			put_be16(&buf[10], 0xffff);
-		}
-		buf += 12;
-	}
-#else
-	valid_page = 1;
-#endif
-
-	/* 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 == SC_MODE_SENSE_6)
-		buf0[0] = len - 1;
-	else
-		put_be16(buf0, len - 2);
-	return len;
-}
-
-static int do_start_stop(struct fsg_dev *fsg)
-{
-	struct lun	*curlun = fsg->curlun;
-	int		loej, start;
-
-	/* int immed = fsg->cmnd[1] & 0x01; */
-	loej = fsg->cmnd[4] & 0x02;
-	start = fsg->cmnd[4] & 0x01;
-
-	if (loej) {
-		/* eject request from the host */
-		if (backing_file_is_open(curlun)) {
-			close_backing_file(fsg, curlun);
-			curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
-		}
-	}
-
-	return 0;
-}
-
-static int do_prevent_allow(struct fsg_dev *fsg)
-{
-	struct lun	*curlun = fsg->curlun;
-	int		prevent;
-
-	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)
-		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 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_be32(&buf[0], curlun->num_sectors);	/* Number of blocks */
-	put_be32(&buf[4], 512);				/* Block length */
-	buf[4] = 0x02;					/* Current capacity */
-	return 12;
-}
-
-
-static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
-	struct lun	*curlun = fsg->curlun;
-
-	/* We don't support MODE SELECT */
-	curlun->sense_data = SS_INVALID_COMMAND;
-	return -EINVAL;
-}
-
-
-/*-------------------------------------------------------------------------*/
-#if 0
-static int write_zero(struct fsg_dev *fsg)
-{
-	struct fsg_buffhd	*bh;
-	int			rc;
-
-	DBG(fsg, "write_zero\n");
-	/* 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;
-	}
-
-	bh->inreq->length = 0;
-	start_transfer(fsg, fsg->bulk_in, bh->inreq,
-			&bh->inreq_busy, &bh->state);
-
-	fsg->next_buffhd_to_fill = bh->next;
-	return 0;
-}
-#endif
-
-static int throw_away_data(struct fsg_dev *fsg)
-{
-	struct fsg_buffhd	*bh;
-	u32			amount;
-	int			rc;
-
-	DBG(fsg, "throw_away_data\n");
-	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->outreq->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) fsg->buf_size);
-
-			/* amount is always divisible by 512, hence by
-			 * the bulk-out maxpacket size */
-			bh->outreq->length = bh->bulk_out_intended_length =
-					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 */
-
-	case DATA_DIR_UNKNOWN:
-		rc = -EINVAL;
-		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) {
-			start_transfer(fsg, fsg->bulk_in, bh->inreq,
-					&bh->inreq_busy, &bh->state);
-			fsg->next_buffhd_to_fill = bh->next;
-		} else {
-			start_transfer(fsg, fsg->bulk_in, bh->inreq,
-					&bh->inreq_busy, &bh->state);
-			fsg->next_buffhd_to_fill = bh->next;
-#if 0
-			/* this is unnecessary, and was causing problems with MacOS */
-			if (bh->inreq->length > 0)
-				write_zero(fsg);
-#endif
-		}
-		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
-		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 lun		*curlun = fsg->curlun;
-	struct fsg_buffhd	*bh;
-	int			rc;
-	u8			status = USB_STATUS_PASS;
-	u32			sd, sdinfo = 0;
-	struct bulk_cs_wrap	*csw;
-
-	DBG(fsg, "send_status\n");
-	/* 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 = USB_STATUS_PHASE_ERROR;
-		sd = SS_INVALID_COMMAND;
-	} else if (sd != SS_NO_SENSE) {
-		DBG(fsg, "sending command-failure status\n");
-		status = USB_STATUS_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);
-	}
-
-	csw = bh->buf;
-
-	/* Store and send the Bulk-only CSW */
-	csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
-	csw->Tag = fsg->tag;
-	csw->Residue = cpu_to_le32(fsg->residue);
-	csw->Status = status;
-
-	bh->inreq->length = USB_BULK_CS_WRAP_LEN;
-	start_transfer(fsg, fsg->bulk_in, bh->inreq,
-			&bh->inreq_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 lun		*curlun;
-
-	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. */
-			DBG(fsg, "phase error 1\n");
-			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;
-		DBG(fsg, "phase error 2\n");
-		return -EINVAL;
-	}
-
-	/* Verify the length of the command itself */
-	if (cmnd_size != fsg->cmnd_size) {
-
-		/* Special case workaround: MS-Windows issues REQUEST_SENSE
-		 * and INQUIRY commands with cbw->Length == 12 (it should be 6). */
-		if ((fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
-		 || (fsg->cmnd[0] == SC_INQUIRY && fsg->cmnd_size == 12))
-			cmnd_size = fsg->cmnd_size;
-		else {
-			fsg->phase_error = 1;
-			return -EINVAL;
-		}
-	}
-
-	/* Check that the LUN values are consistent */
-	if (fsg->lun != lun)
-		DBG(fsg, "using LUN %d from CBW, "
-				"not LUN %d from CDB\n",
-				fsg->lun, lun);
-
-	/* Check the LUN */
-	if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
-		fsg->curlun = curlun = &fsg->luns[fsg->lun];
-		if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
-			curlun->sense_data = SS_NO_SENSE;
-			curlun->sense_data_info = 0;
-			curlun->info_valid = 0;
-		}
-	} else {
-		fsg->curlun = curlun = NULL;
-		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] != SC_INQUIRY &&
-				fsg->cmnd[0] != SC_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] != SC_INQUIRY &&
-			fsg->cmnd[0] != SC_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;
-			DBG(fsg, "SS_INVALID_FIELD_IN_CDB\n");
-			return -EINVAL;
-		}
-	}
-
-	/* If the medium isn't mounted and the command needs to access
-	 * it, return an error. */
-	if (curlun && !backing_file_is_open(curlun) && needs_medium) {
-		curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
-		DBG(fsg, "SS_MEDIUM_NOT_PRESENT\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-
-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 SC_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 SC_MODE_SELECT_6:
-		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 SC_MODE_SELECT_10:
-		fsg->data_size_from_cmnd = get_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 SC_MODE_SENSE_6:
-		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 SC_MODE_SENSE_10:
-		fsg->data_size_from_cmnd = get_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 SC_PREVENT_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 SC_READ_6:
-		i = fsg->cmnd[4];
-		fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
-		if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
-				(7<<1) | (1<<4), 1,
-				"READ(6)")) == 0)
-			reply = do_read(fsg);
-		break;
-
-	case SC_READ_10:
-		fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
-		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
-				(1<<1) | (0xf<<2) | (3<<7), 1,
-				"READ(10)")) == 0)
-			reply = do_read(fsg);
-		break;
-
-	case SC_READ_12:
-		fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
-		if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
-				(1<<1) | (0xf<<2) | (0xf<<6), 1,
-				"READ(12)")) == 0)
-			reply = do_read(fsg);
-		break;
-
-	case SC_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 SC_READ_FORMAT_CAPACITIES:
-		fsg->data_size_from_cmnd = get_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 SC_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 SC_START_STOP_UNIT:
-		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 SC_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 SC_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 SC_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 SC_WRITE_6:
-		i = fsg->cmnd[4];
-		fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
-		if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
-				(7<<1) | (1<<4), 1,
-				"WRITE(6)")) == 0)
-			reply = do_write(fsg);
-		break;
-
-	case SC_WRITE_10:
-		fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
-		if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
-				(1<<1) | (0xf<<2) | (3<<7), 1,
-				"WRITE(10)")) == 0)
-			reply = do_write(fsg);
-		break;
-
-	case SC_WRITE_12:
-		fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
-		if ((reply = check_command(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 SC_FORMAT_UNIT:
-	case SC_RELEASE:
-	case SC_RESERVE:
-	case SC_SEND_DIAGNOSTIC:
-		/* Fall through */
-
-	default:
-		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, 0xff, 0, unknown)) == 0) {
-			fsg->curlun->sense_data = SS_INVALID_COMMAND;
-			reply = -EINVAL;
-		}
-		break;
-	}
-	up_read(&fsg->filesem);
-
-	VDBG(fsg, "reply: %d, fsg->data_size_from_cmnd: %d\n",
-			reply, fsg->data_size_from_cmnd);
-	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? */
-	if (req->status)
-		return -EINVAL;
-
-	/* Is the CBW valid? */
-	if (req->actual != USB_BULK_CB_WRAP_LEN ||
-			cbw->Signature != __constant_cpu_to_le32(
-				USB_BULK_CB_SIG)) {
-		DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
-				req->actual,
-				le32_to_cpu(cbw->Signature));
-		return -EINVAL;
-	}
-
-	/* Is the CBW meaningful? */
-	if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
-			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);
-		return -EINVAL;
-	}
-
-	/* Save the command for later */
-	fsg->cmnd_size = cbw->Length;
-	memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
-	if (cbw->Flags & USB_BULK_IN_FLAG)
-		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;
-
-	/* 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) {
-			usb_ep_dequeue(fsg->bulk_out, bh->outreq);
-			bh->outreq_busy = 0;
-			bh->state = BUF_STATE_EMPTY;
-			return rc;
-		}
-	}
-
-	/* Queue a request to read a Bulk-only CBW */
-	set_bulk_out_req_length(fsg, bh, USB_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) {
-			usb_ep_dequeue(fsg->bulk_out, bh->outreq);
-			bh->outreq_busy = 0;
-			bh->state = BUF_STATE_EMPTY;
-			return rc;
-		}
-	}
-	smp_rmb();
-	rc = received_cbw(fsg, bh);
-	bh->state = BUF_STATE_EMPTY;
-
-	return rc;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
-		const struct usb_endpoint_descriptor *d)
-{
-	int	rc;
-
-	DBG(fsg, "usb_ep_enable %s\n", ep->name);
-	ep->driver_data = fsg;
-	rc = usb_ep_enable(ep, d);
-	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)
-{
-	struct usb_composite_dev *cdev = fsg->cdev;
-	int	rc = 0;
-	int	i;
-	const struct usb_endpoint_descriptor	*d;
-
-	if (fsg->running)
-		DBG(fsg, "reset interface\n");
-reset:
-	 /* Disable the endpoints */
-	if (fsg->bulk_in_enabled) {
-		DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_in->name);
-		usb_ep_disable(fsg->bulk_in);
-		fsg->bulk_in_enabled = 0;
-	}
-	if (fsg->bulk_out_enabled) {
-		DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_out->name);
-		usb_ep_disable(fsg->bulk_out);
-		fsg->bulk_out_enabled = 0;
-	}
-
-	/* Deallocate the requests */
-	for (i = 0; i < 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;
-		}
-	}
-
-
-	fsg->running = 0;
-	if (altsetting < 0 || rc != 0)
-		return rc;
-
-	DBG(fsg, "set interface %d\n", altsetting);
-
-	/* Enable the endpoints */
-	d = ep_desc(cdev->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
-	if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
-		goto reset;
-	fsg->bulk_in_enabled = 1;
-
-	d = ep_desc(cdev->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
-	if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
-		goto reset;
-	fsg->bulk_out_enabled = 1;
-	fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
-
-	/* Allocate the requests */
-	for (i = 0; i < NUM_BUFFERS; ++i) {
-		struct fsg_buffhd	*bh = &fsg->buffhds[i];
-
-		rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq);
-		if (rc != 0)
-			goto reset;
-		rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq);
-		if (rc != 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;
-	}
-
-	fsg->running = 1;
-	for (i = 0; i < fsg->nluns; ++i)
-		fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
-
-	return rc;
-}
-
-static void adjust_wake_lock(struct fsg_dev *fsg)
-{
-	int ums_active = 0;
-	int i;
-	unsigned long		flags;
-
-	spin_lock_irqsave(&fsg->lock, flags);
-
-	if (fsg->config) {
-		for (i = 0; i < fsg->nluns; ++i) {
-			if (backing_file_is_open(&fsg->luns[i]))
-				ums_active = 1;
-		}
-	}
-
-	if (ums_active)
-		wake_lock(&fsg->wake_lock);
-	else
-		wake_unlock(&fsg->wake_lock);
-
-	spin_unlock_irqrestore(&fsg->lock, flags);
-}
-
-/*
- * 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
-	}
-
-	switch_set_state(&fsg->sdev, new_config);
-	adjust_wake_lock(fsg);
-	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 lun		*curlun;
-	int			rc;
-	unsigned long		flags;
-
-	DBG(fsg, "handle_exception state: %d\n", (int)fsg->state);
-	/* 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 */
-	for (i = 0; i < 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 = 0;
-		for (i = 0; i < NUM_BUFFERS; ++i) {
-			bh = &fsg->buffhds[i];
-			num_active += bh->outreq_busy;
-		}
-		if (num_active == 0)
-			break;
-		if (sleep_thread(fsg))
-			return;
-	}
-
-	/*
-	* Do NOT flush the fifo after set_interface()
-	* Otherwise, it results in some data being lost
-	*/
-	if ((fsg->state != FSG_STATE_CONFIG_CHANGE) ||
-		(fsg->new_config != 1))   {
-		/* 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);
-	}
-	/* Reset the I/O buffer states and pointers, the SCSI
-	 * state, and the exception.  Then invoke the handler. */
-	spin_lock_irqsave(&fsg->lock, flags);
-
-	for (i = 0; i < 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];
-
-	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_irqrestore(&fsg->lock, flags);
-
-	/* Carry out any extra actions required for the exception */
-	switch (old_state) {
-	default:
-		break;
-
-	case FSG_STATE_ABORT_BULK_OUT:
-		DBG(fsg, "FSG_STATE_ABORT_BULK_OUT\n");
-		spin_lock_irqsave(&fsg->lock, flags);
-		if (fsg->state == FSG_STATE_STATUS_PHASE)
-			fsg->state = FSG_STATE_IDLE;
-		spin_unlock_irqrestore(&fsg->lock, flags);
-		break;
-
-	case FSG_STATE_RESET:
-		/* really not much to do here */
-		break;
-
-	case FSG_STATE_CONFIG_CHANGE:
-		rc = do_set_config(fsg, new_config);
-		if (new_config == 0) {
-			/* We're using the backing file */
-			down_read(&fsg->filesem);
-			fsync_all(fsg);
-			up_read(&fsg->filesem);
-		}
-		break;
-
-	case FSG_STATE_EXIT:
-	case FSG_STATE_TERMINATED:
-		do_set_config(fsg, 0);			/* Free resources */
-		spin_lock_irqsave(&fsg->lock, flags);
-		fsg->state = FSG_STATE_TERMINATED;	/* Stop the thread */
-		spin_unlock_irqrestore(&fsg->lock, flags);
-		break;
-	}
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int fsg_main_thread(void *fsg_)
-{
-	struct fsg_dev		*fsg = fsg_;
-	unsigned long		flags;
-
-	/* 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_irqsave(&fsg->lock, flags);
-		if (!exception_in_progress(fsg))
-			fsg->state = FSG_STATE_DATA_PHASE;
-		spin_unlock_irqrestore(&fsg->lock, flags);
-
-		if (do_scsi_command(fsg) || finish_reply(fsg))
-			continue;
-
-		spin_lock_irqsave(&fsg->lock, flags);
-		if (!exception_in_progress(fsg))
-			fsg->state = FSG_STATE_STATUS_PHASE;
-		spin_unlock_irqrestore(&fsg->lock, flags);
-
-		if (send_status(fsg))
-			continue;
-
-		spin_lock_irqsave(&fsg->lock, flags);
-		if (!exception_in_progress(fsg))
-			fsg->state = FSG_STATE_IDLE;
-		spin_unlock_irqrestore(&fsg->lock, flags);
-	}
-
-	spin_lock_irqsave(&fsg->lock, flags);
-	fsg->thread_task = NULL;
-	spin_unlock_irqrestore(&fsg->lock, flags);
-
-	/* In case we are exiting because of a signal, unregister the
-	 * gadget driver and close the backing file. */
-	if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
-		close_all_backing_files(fsg);
-
-	/* Let the unbind and cleanup routines know the thread has exited */
-	complete_and_exit(&fsg->thread_notifier, 0);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* If the next two routines are called while the gadget is registered,
- * the caller must own fsg->filesem for writing. */
-
-static int open_backing_file(struct fsg_dev *fsg, struct lun *curlun,
-	const char *filename)
-{
-	int				ro;
-	struct file			*filp = NULL;
-	int				rc = -EINVAL;
-	struct inode			*inode = NULL;
-	loff_t				size;
-	loff_t				num_sectors;
-
-	/* R/W if we can, R/O if we must */
-	ro = curlun->ro;
-	if (!ro) {
-		filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
-		if (-EROFS == PTR_ERR(filp))
-			ro = 1;
-	}
-	if (ro)
-		filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
-	if (IS_ERR(filp)) {
-		LINFO(curlun, "unable to open backing file: %s\n", filename);
-		return PTR_ERR(filp);
-	}
-
-	if (!(filp->f_mode & FMODE_WRITE))
-		ro = 1;
-
-	if (filp->f_path.dentry)
-		inode = filp->f_path.dentry->d_inode;
-	if (inode && S_ISBLK(inode->i_mode)) {
-		if (bdev_read_only(inode->i_bdev))
-			ro = 1;
-	} else if (!inode || !S_ISREG(inode->i_mode)) {
-		LINFO(curlun, "invalid file type: %s\n", filename);
-		goto out;
-	}
-
-	/* If we can't read the file, it's no good.
-	 * If we can't write the file, use it read-only. */
-	if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
-		LINFO(curlun, "file not readable: %s\n", filename);
-		goto out;
-	}
-	if (!(filp->f_op->write || filp->f_op->aio_write))
-		ro = 1;
-
-	size = i_size_read(inode->i_mapping->host);
-	if (size < 0) {
-		LINFO(curlun, "unable to find file size: %s\n", filename);
-		rc = (int) size;
-		goto out;
-	}
-	num_sectors = size >> 9;	/* File size in 512-byte sectors */
-	if (num_sectors == 0) {
-		LINFO(curlun, "file too small: %s\n", filename);
-		rc = -ETOOSMALL;
-		goto out;
-	}
-
-	get_file(filp);
-	curlun->ro = ro;
-	curlun->filp = filp;
-	curlun->file_length = size;
-	curlun->unflushed_bytes = 0;
-	curlun->num_sectors = num_sectors;
-	LDBG(curlun, "open backing file: %s size: %lld num_sectors: %lld\n",
-			filename, size, num_sectors);
-	rc = 0;
-	adjust_wake_lock(fsg);
-
-out:
-	filp_close(filp, current->files);
-	return rc;
-}
-
-
-static void close_backing_file(struct fsg_dev *fsg, struct lun *curlun)
-{
-	if (curlun->filp) {
-		int rc;
-
-		/*
-		 * XXX: San: Ugly hack here added to ensure that
-		 * our pages get synced to disk.
-		 * Also drop caches here just to be extra-safe
-		 */
-		rc = vfs_fsync(curlun->filp, 1);
-		if (rc < 0)
-			printk(KERN_ERR "ums: Error syncing data (%d)\n", rc);
-		/* drop_pagecache and drop_slab are no longer available */
-		/* drop_pagecache(); */
-		/* drop_slab(); */
-
-		LDBG(curlun, "close backing file\n");
-		fput(curlun->filp);
-		curlun->filp = NULL;
-		adjust_wake_lock(fsg);
-	}
-}
-
-static void close_all_backing_files(struct fsg_dev *fsg)
-{
-	int	i;
-
-	for (i = 0; i < fsg->nluns; ++i)
-		close_backing_file(fsg, &fsg->luns[i]);
-}
-
-static ssize_t show_file(struct device *dev, struct device_attribute *attr,
-		char *buf)
-{
-	struct lun	*curlun = dev_to_lun(dev);
-	struct fsg_dev	*fsg = dev_get_drvdata(dev);
-	char		*p;
-	ssize_t		rc;
-
-	down_read(&fsg->filesem);
-	if (backing_file_is_open(curlun)) {	/* Get the complete pathname */
-		p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1);
-		if (IS_ERR(p))
-			rc = PTR_ERR(p);
-		else {
-			rc = strlen(p);
-			memmove(buf, p, rc);
-			buf[rc] = '\n';		/* Add a newline */
-			buf[++rc] = 0;
-		}
-	} else {				/* No file, return 0 bytes */
-		*buf = 0;
-		rc = 0;
-	}
-	up_read(&fsg->filesem);
-	return rc;
-}
-
-static ssize_t store_file(struct device *dev, struct device_attribute *attr,
-		const char *buf, size_t count)
-{
-	struct lun	*curlun = dev_to_lun(dev);
-	struct fsg_dev	*fsg = dev_get_drvdata(dev);
-	int		rc = 0;
-
-	DBG(fsg, "store_file: \"%s\"\n", buf);
-#if 0
-	/* disabled because we need to allow closing the backing file if the media was removed */
-	if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
-		LDBG(curlun, "eject attempt prevented\n");
-		return -EBUSY;				/* "Door is locked" */
-	}
-#endif
-
-	/* Remove a trailing newline */
-	if (count > 0 && buf[count-1] == '\n')
-		((char *) buf)[count-1] = 0;
-
-	/* Eject current medium */
-	down_write(&fsg->filesem);
-	if (backing_file_is_open(curlun)) {
-		close_backing_file(fsg, curlun);
-		curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
-	}
-
-	/* Load new medium */
-	if (count > 0 && buf[0]) {
-		rc = open_backing_file(fsg, curlun, buf);
-		if (rc == 0)
-			curlun->unit_attention_data =
-					SS_NOT_READY_TO_READY_TRANSITION;
-	}
-	up_write(&fsg->filesem);
-	return (rc < 0 ? rc : count);
-}
-
-
-static DEVICE_ATTR(file, 0444, show_file, store_file);
-
-/*-------------------------------------------------------------------------*/
-
-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 fsg_dev	*fsg = dev_get_drvdata(dev);
-
-	kref_put(&fsg->ref, fsg_release);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int __init fsg_alloc(void)
-{
-	struct fsg_dev		*fsg;
-
-	fsg = kzalloc(sizeof *fsg, 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 ssize_t print_switch_name(struct switch_dev *sdev, char *buf)
-{
-	return sprintf(buf, "%s\n", DRIVER_NAME);
-}
-
-static ssize_t print_switch_state(struct switch_dev *sdev, char *buf)
-{
-	struct fsg_dev	*fsg = container_of(sdev, struct fsg_dev, sdev);
-	return sprintf(buf, "%s\n", (fsg->config ? "online" : "offline"));
-}
-
-static void
-fsg_function_unbind(struct usb_configuration *c, struct usb_function *f)
-{
-	struct fsg_dev	*fsg = func_to_dev(f);
-	int			i;
-	struct lun		*curlun;
-
-	DBG(fsg, "fsg_function_unbind\n");
-	clear_bit(REGISTERED, &fsg->atomic_bitflags);
-
-	/* 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_file);
-			device_unregister(&curlun->dev);
-			curlun->registered = 0;
-		}
-	}
-
-	/* 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);
-	}
-
-	/* Free the data buffers */
-	for (i = 0; i < NUM_BUFFERS; ++i)
-		kfree(fsg->buffhds[i].buf);
-	switch_dev_unregister(&fsg->sdev);
-}
-
-static int
-fsg_function_bind(struct usb_configuration *c, struct usb_function *f)
-{
-	struct usb_composite_dev *cdev = c->cdev;
-	struct fsg_dev	*fsg = func_to_dev(f);
-	int			rc;
-	int			i;
-	int			id;
-	struct lun		*curlun;
-	struct usb_ep		*ep;
-	char			*pathbuf, *p;
-
-	fsg->cdev = cdev;
-	DBG(fsg, "fsg_function_bind\n");
-
-	dev_attr_file.attr.mode = 0644;
-
-	/* Find out how many LUNs there should be */
-	i = fsg->nluns;
-	if (i == 0)
-		i = 1;
-	if (i > 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 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->ro = 0;
-		curlun->dev.release = lun_release;
-		/* use "usb_mass_storage" platform device as parent if available */
-		if (fsg->pdev)
-			curlun->dev.parent = &fsg->pdev->dev;
-		else
-			curlun->dev.parent = &cdev->gadget->dev;
-		dev_set_drvdata(&curlun->dev, fsg);
-		dev_set_name(&curlun->dev,"lun%d", i);
-
-		rc = device_register(&curlun->dev);
-		if (rc != 0) {
-			INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
-			goto out;
-		}
-		rc = device_create_file(&curlun->dev, &dev_attr_file);
-		if (rc != 0) {
-			ERROR(fsg, "device_create_file failed: %d\n", rc);
-			device_unregister(&curlun->dev);
-			goto out;
-		}
-		curlun->registered = 1;
-		kref_get(&fsg->ref);
-	}
-
-	/* allocate interface ID(s) */
-	id = usb_interface_id(c, f);
-	if (id < 0)
-		return id;
-	intf_desc.bInterfaceNumber = id;
-
-	ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_in_desc);
-	if (!ep)
-		goto autoconf_fail;
-	ep->driver_data = fsg;		/* claim the endpoint */
-	fsg->bulk_in = ep;
-
-	ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_out_desc);
-	if (!ep)
-		goto autoconf_fail;
-	ep->driver_data = fsg;		/* claim the endpoint */
-	fsg->bulk_out = ep;
-
-	rc = -ENOMEM;
-
-	if (gadget_is_dualspeed(cdev->gadget)) {
-		/* Assume endpoint addresses are the same for both speeds */
-		hs_bulk_in_desc.bEndpointAddress =
-				fs_bulk_in_desc.bEndpointAddress;
-		hs_bulk_out_desc.bEndpointAddress =
-				fs_bulk_out_desc.bEndpointAddress;
-
-		f->hs_descriptors = hs_function;
-	}
-
-	/* Allocate the data buffers */
-	for (i = 0; i < 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(fsg->buf_size, GFP_KERNEL);
-		if (!bh->buf)
-			goto out;
-		bh->next = bh + 1;
-	}
-	fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
-
-	fsg->thread_task = kthread_create(fsg_main_thread, fsg,
-			shortname);
-	if (IS_ERR(fsg->thread_task)) {
-		rc = PTR_ERR(fsg->thread_task);
-		ERROR(fsg, "kthread_create failed: %d\n", rc);
-		goto out;
-	}
-
-	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 (backing_file_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, file: %s\n",
-					curlun->ro, (p ? p : "(error)"));
-		}
-	}
-	kfree(pathbuf);
-
-	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:
-	DBG(fsg, "fsg_function_bind failed: %d\n", rc);
-	fsg->state = FSG_STATE_TERMINATED;	/* The thread is dead */
-	fsg_function_unbind(c, f);
-	close_all_backing_files(fsg);
-	return rc;
-}
-
-static int fsg_function_set_alt(struct usb_function *f,
-		unsigned intf, unsigned alt)
-{
-	struct fsg_dev	*fsg = func_to_dev(f);
-	DBG(fsg, "fsg_function_set_alt intf: %d alt: %d\n", intf, alt);
-	fsg->new_config = 1;
-	raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
-	return 0;
-}
-
-static void fsg_function_disable(struct usb_function *f)
-{
-	struct fsg_dev	*fsg = func_to_dev(f);
-	DBG(fsg, "fsg_function_disable\n");
-	fsg->new_config = 0;
-	raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
-}
-
-static int __init fsg_probe(struct platform_device *pdev)
-{
-	struct usb_mass_storage_platform_data *pdata = pdev->dev.platform_data;
-	struct fsg_dev *fsg = the_fsg;
-
-	fsg->pdev = pdev;
-	printk(KERN_INFO "fsg_probe pdata: %p\n", pdata);
-
-	if (pdata) {
-		if (pdata->vendor)
-			fsg->vendor = pdata->vendor;
-
-		if (pdata->product)
-			fsg->product = pdata->product;
-
-		if (pdata->release)
-			fsg->release = pdata->release;
-		fsg->nluns = pdata->nluns;
-	}
-
-	return 0;
-}
-
-static struct platform_driver fsg_platform_driver = {
-	.driver = { .name = "usb_mass_storage", },
-	.probe = fsg_probe,
-};
-
-int mass_storage_bind_config(struct usb_configuration *c)
-{
-	int		rc;
-	struct fsg_dev	*fsg;
-
-	printk(KERN_INFO "mass_storage_bind_config\n");
-	rc = fsg_alloc();
-	if (rc)
-		return rc;
-	fsg = the_fsg;
-
-	spin_lock_init(&fsg->lock);
-	init_rwsem(&fsg->filesem);
-	kref_init(&fsg->ref);
-	init_completion(&fsg->thread_notifier);
-
-	the_fsg->buf_size = BULK_BUFFER_SIZE;
-	the_fsg->sdev.name = DRIVER_NAME;
-	the_fsg->sdev.print_name = print_switch_name;
-	the_fsg->sdev.print_state = print_switch_state;
-	rc = switch_dev_register(&the_fsg->sdev);
-	if (rc < 0)
-		goto err_switch_dev_register;
-
-	rc = platform_driver_register(&fsg_platform_driver);
-	if (rc != 0)
-		goto err_platform_driver_register;
-
-	wake_lock_init(&the_fsg->wake_lock, WAKE_LOCK_SUSPEND,
-			   "usb_mass_storage");
-
-	fsg->cdev = c->cdev;
-	fsg->function.name = shortname;
-	fsg->function.descriptors = fs_function;
-	fsg->function.bind = fsg_function_bind;
-	fsg->function.unbind = fsg_function_unbind;
-	fsg->function.setup = fsg_function_setup;
-	fsg->function.set_alt = fsg_function_set_alt;
-	fsg->function.disable = fsg_function_disable;
-
-	rc = usb_add_function(c, &fsg->function);
-	if (rc != 0)
-		goto err_usb_add_function;
-
-
-	return 0;
-
-err_usb_add_function:
-	wake_lock_destroy(&the_fsg->wake_lock);
-	platform_driver_unregister(&fsg_platform_driver);
-err_platform_driver_register:
-	switch_dev_unregister(&the_fsg->sdev);
-err_switch_dev_register:
-	kref_put(&the_fsg->ref, fsg_release);
-
-	return rc;
-}
-
-static struct android_usb_function mass_storage_function = {
-	.name = "usb_mass_storage",
-	.bind_config = mass_storage_bind_config,
-};
-
-static int __init init(void)
-{
-	printk(KERN_INFO "f_mass_storage init\n");
-	android_register_function(&mass_storage_function);
-	return 0;
-}
-module_init(init);
-