diff options
Diffstat (limited to 'drivers/usb/gadget/f_mass_storage.c')
| -rwxr-xr-x | drivers/usb/gadget/f_mass_storage.c | 3025 |
1 files changed, 3025 insertions, 0 deletions
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c new file mode 100755 index 000000000000..617cbee8e8bb --- /dev/null +++ b/drivers/usb/gadget/f_mass_storage.c @@ -0,0 +1,3025 @@ +/* + * 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_usual.h> +#include <linux/usb/ch9.h> +#include <linux/usb/composite.h> +#include <linux/usb/gadget.h> +#include <linux/usb/android.h> + +#include "f_mass_storage.h" +#include "gadget_chips.h" + + +#define BULK_BUFFER_SIZE 16384 + +/* 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 +#define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value + +/* 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, filp->f_path.dentry, 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) { + /* WIN Vista expects len = 0xC0 */ + if (fsg->data_size_from_cmnd > len) + len = fsg->data_size_from_cmnd; + 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 with cbw->Length == 12 (it should be 6). */ + if ((fsg->cmnd[0] == SC_REQUEST_SENSE || 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, ¤t->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, curlun->filp->f_path.dentry, 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 __init +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); + + if (kobject_set_name(&curlun->dev.kobj, "lun%d", i)) { + INFO(fsg, "failed to alloc kobj dev name\n"); + goto out; + } + + 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"); + if (fsg->new_config) + do_set_interface(fsg, -1); + fsg->new_config = 0; + if (fsg->config != 0) { + fsg->config = 0; + do_set_interface(fsg, -1); + } + 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; + } + + return 0; +} + +static struct platform_driver fsg_platform_driver = { + .driver = { .name = "usb_mass_storage", }, + .probe = fsg_probe, +}; + +int __init mass_storage_function_add(struct usb_composite_dev *cdev, + struct usb_configuration *c, int nluns) +{ + int rc; + struct fsg_dev *fsg; + + printk(KERN_INFO "mass_storage_function_add\n"); + rc = fsg_alloc(); + if (rc) + return rc; + fsg = the_fsg; + fsg->nluns = nluns; + + 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 = 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; +} + + |