2 * storage_common.c -- Common definitions for mass storage functionality
4 * Copyright (C) 2003-2008 Alan Stern
5 * Copyeight (C) 2009 Samsung Electronics
6 * Author: Michal Nazarewicz (mina86@mina86.com)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
16 * This file requires the following identifiers used in USB strings to
17 * be defined (each of type pointer to char):
18 * - fsg_string_manufacturer -- name of the manufacturer
19 * - fsg_string_product -- name of the product
20 * - fsg_string_config -- name of the configuration
21 * - fsg_string_interface -- name of the interface
22 * The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS
23 * macro is defined prior to including this file.
27 * When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and
28 * fsg_hs_intr_in_desc objects as well as
29 * FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES
30 * macros are not defined.
32 * When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER,
33 * FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not
34 * defined (as well as corresponding entries in string tables are
35 * missing) and FSG_STRING_INTERFACE has value of zero.
37 * When FSG_NO_OTG is defined fsg_otg_desc won't be defined.
41 * When FSG_BUFFHD_STATIC_BUFFER is defined when this file is included
42 * the fsg_buffhd structure's buf field will be an array of FSG_BUFLEN
43 * characters rather then a pointer to void.
47 * When USB_GADGET_DEBUG_FILES is defined the module param num_buffers
48 * sets the number of pipeline buffers (length of the fsg_buffhd array).
49 * The valid range of num_buffers is: num >= 2 && num <= 4.
53 #include <linux/usb/storage.h>
54 #include <scsi/scsi.h>
55 #include <asm/unaligned.h>
59 * Thanks to NetChip Technologies for donating this product ID.
61 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
62 * Instead: allocate your own, using normal USB-IF procedures.
64 #define FSG_VENDOR_ID 0x0525 /* NetChip */
65 #define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
68 /*-------------------------------------------------------------------------*/
79 #define VLDBG(lun, fmt, args...) do { } while (0)
80 #endif /* VERBOSE_DEBUG */
82 #define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args)
83 #define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args)
84 #define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args)
85 #define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args)
88 * Keep those macros in sync with those in
89 * include/linux/usb/composite.h or else GCC will complain. If they
90 * are identical (the same names of arguments, white spaces in the
91 * same places) GCC will allow redefinition otherwise (even if some
92 * white space is removed or added) warning will be issued.
94 * Those macros are needed here because File Storage Gadget does not
95 * include the composite.h header. For composite gadgets those macros
96 * are redundant since composite.h is included any way.
98 * One could check whether those macros are already defined (which
99 * would indicate composite.h had been included) or not (which would
100 * indicate we were in FSG) but this is not done because a warning is
101 * desired if definitions here differ from the ones in composite.h.
103 * We want the definitions to match and be the same in File Storage
104 * Gadget as well as Mass Storage Function (and so composite gadgets
105 * using MSF). If someone changes them in composite.h it will produce
106 * a warning in this file when building MSF.
108 #define DBG(d, fmt, args...) dev_dbg(&(d)->gadget->dev , fmt , ## args)
109 #define VDBG(d, fmt, args...) dev_vdbg(&(d)->gadget->dev , fmt , ## args)
110 #define ERROR(d, fmt, args...) dev_err(&(d)->gadget->dev , fmt , ## args)
111 #define WARNING(d, fmt, args...) dev_warn(&(d)->gadget->dev , fmt , ## args)
112 #define INFO(d, fmt, args...) dev_info(&(d)->gadget->dev , fmt , ## args)
118 # define dump_msg(fsg, /* const char * */ label, \
119 /* const u8 * */ buf, /* unsigned */ length) do { \
120 if (length < 512) { \
121 DBG(fsg, "%s, length %u:\n", label, length); \
122 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \
123 16, 1, buf, length, 0); \
127 # define dump_cdb(fsg) do { } while (0)
131 # define dump_msg(fsg, /* const char * */ label, \
132 /* const u8 * */ buf, /* unsigned */ length) do { } while (0)
134 # ifdef VERBOSE_DEBUG
136 # define dump_cdb(fsg) \
137 print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \
138 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \
142 # define dump_cdb(fsg) do { } while (0)
144 # endif /* VERBOSE_DEBUG */
146 #endif /* DUMP_MSGS */
148 /*-------------------------------------------------------------------------*/
150 /* CBI Interrupt data structure */
151 struct interrupt_data {
156 #define CBI_INTERRUPT_DATA_LEN 2
158 /* CBI Accept Device-Specific Command request */
159 #define USB_CBI_ADSC_REQUEST 0x00
162 /* Length of a SCSI Command Data Block */
163 #define MAX_COMMAND_SIZE 16
165 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
166 #define SS_NO_SENSE 0
167 #define SS_COMMUNICATION_FAILURE 0x040800
168 #define SS_INVALID_COMMAND 0x052000
169 #define SS_INVALID_FIELD_IN_CDB 0x052400
170 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
171 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
172 #define SS_MEDIUM_NOT_PRESENT 0x023a00
173 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
174 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800
175 #define SS_RESET_OCCURRED 0x062900
176 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
177 #define SS_UNRECOVERED_READ_ERROR 0x031100
178 #define SS_WRITE_ERROR 0x030c02
179 #define SS_WRITE_PROTECTED 0x072700
181 #define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */
182 #define ASC(x) ((u8) ((x) >> 8))
183 #define ASCQ(x) ((u8) (x))
186 /*-------------------------------------------------------------------------*/
194 unsigned int initially_ro:1;
196 unsigned int removable:1;
197 unsigned int cdrom:1;
198 unsigned int prevent_medium_removal:1;
199 unsigned int registered:1;
200 unsigned int info_valid:1;
201 unsigned int nofua:1;
205 u32 unit_attention_data;
207 unsigned int blkbits; /* Bits of logical block size of bound block device */
208 unsigned int blksize; /* logical block size of bound block device */
212 #define fsg_lun_is_open(curlun) ((curlun)->filp != NULL)
214 static struct fsg_lun *fsg_lun_from_dev(struct device *dev)
216 return container_of(dev, struct fsg_lun, dev);
220 /* Big enough to hold our biggest descriptor */
221 #define EP0_BUFSIZE 256
222 #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
224 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
226 static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS;
227 module_param_named(num_buffers, fsg_num_buffers, uint, S_IRUGO);
228 MODULE_PARM_DESC(num_buffers, "Number of pipeline buffers");
233 * Number of buffers we will use.
234 * 2 is usually enough for good buffering pipeline
236 #define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
238 #endif /* CONFIG_USB_DEBUG */
240 /* check if fsg_num_buffers is within a valid range */
241 static inline int fsg_num_buffers_validate(void)
243 if (fsg_num_buffers >= 2 && fsg_num_buffers <= 4)
245 pr_err("fsg_num_buffers %u is out of range (%d to %d)\n",
246 fsg_num_buffers, 2 ,4);
250 /* Default size of buffer length. */
251 #define FSG_BUFLEN ((u32)16384)
253 /* Maximal number of LUNs supported in mass storage function */
254 #define FSG_MAX_LUNS 8
256 enum fsg_buffer_state {
263 #ifdef FSG_BUFFHD_STATIC_BUFFER
264 char buf[FSG_BUFLEN];
268 enum fsg_buffer_state state;
269 struct fsg_buffhd *next;
272 * The NetChip 2280 is faster, and handles some protocol faults
273 * better, if we don't submit any short bulk-out read requests.
274 * So we will record the intended request length here.
276 unsigned int bulk_out_intended_length;
278 struct usb_request *inreq;
280 struct usb_request *outreq;
285 /* This one isn't used anywhere */
286 FSG_STATE_COMMAND_PHASE = -10,
287 FSG_STATE_DATA_PHASE,
288 FSG_STATE_STATUS_PHASE,
291 FSG_STATE_ABORT_BULK_OUT,
293 FSG_STATE_INTERFACE_CHANGE,
294 FSG_STATE_CONFIG_CHANGE,
295 FSG_STATE_DISCONNECT,
300 enum data_direction {
301 DATA_DIR_UNKNOWN = 0,
308 /*-------------------------------------------------------------------------*/
311 static inline u32 get_unaligned_be24(u8 *buf)
313 return 0xffffff & (u32) get_unaligned_be32(buf - 1);
317 /*-------------------------------------------------------------------------*/
321 #ifndef FSG_NO_DEVICE_STRINGS
322 FSG_STRING_MANUFACTURER = 1,
332 static struct usb_otg_descriptor
334 .bLength = sizeof fsg_otg_desc,
335 .bDescriptorType = USB_DT_OTG,
337 .bmAttributes = USB_OTG_SRP,
341 /* There is only one interface. */
343 static struct usb_interface_descriptor
345 .bLength = sizeof fsg_intf_desc,
346 .bDescriptorType = USB_DT_INTERFACE,
348 .bNumEndpoints = 2, /* Adjusted during fsg_bind() */
349 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
350 .bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */
351 .bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */
352 .iInterface = FSG_STRING_INTERFACE,
356 * Three full-speed endpoint descriptors: bulk-in, bulk-out, and
360 static struct usb_endpoint_descriptor
361 fsg_fs_bulk_in_desc = {
362 .bLength = USB_DT_ENDPOINT_SIZE,
363 .bDescriptorType = USB_DT_ENDPOINT,
365 .bEndpointAddress = USB_DIR_IN,
366 .bmAttributes = USB_ENDPOINT_XFER_BULK,
367 /* wMaxPacketSize set by autoconfiguration */
370 static struct usb_endpoint_descriptor
371 fsg_fs_bulk_out_desc = {
372 .bLength = USB_DT_ENDPOINT_SIZE,
373 .bDescriptorType = USB_DT_ENDPOINT,
375 .bEndpointAddress = USB_DIR_OUT,
376 .bmAttributes = USB_ENDPOINT_XFER_BULK,
377 /* wMaxPacketSize set by autoconfiguration */
380 #ifndef FSG_NO_INTR_EP
382 static struct usb_endpoint_descriptor
383 fsg_fs_intr_in_desc = {
384 .bLength = USB_DT_ENDPOINT_SIZE,
385 .bDescriptorType = USB_DT_ENDPOINT,
387 .bEndpointAddress = USB_DIR_IN,
388 .bmAttributes = USB_ENDPOINT_XFER_INT,
389 .wMaxPacketSize = cpu_to_le16(2),
390 .bInterval = 32, /* frames -> 32 ms */
394 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2
396 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1
401 static struct usb_descriptor_header *fsg_fs_function[] = {
403 (struct usb_descriptor_header *) &fsg_otg_desc,
405 (struct usb_descriptor_header *) &fsg_intf_desc,
406 (struct usb_descriptor_header *) &fsg_fs_bulk_in_desc,
407 (struct usb_descriptor_header *) &fsg_fs_bulk_out_desc,
408 #ifndef FSG_NO_INTR_EP
409 (struct usb_descriptor_header *) &fsg_fs_intr_in_desc,
416 * USB 2.0 devices need to expose both high speed and full speed
417 * descriptors, unless they only run at full speed.
419 * That means alternate endpoint descriptors (bigger packets)
420 * and a "device qualifier" ... plus more construction options
421 * for the configuration descriptor.
423 static struct usb_endpoint_descriptor
424 fsg_hs_bulk_in_desc = {
425 .bLength = USB_DT_ENDPOINT_SIZE,
426 .bDescriptorType = USB_DT_ENDPOINT,
428 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
429 .bmAttributes = USB_ENDPOINT_XFER_BULK,
430 .wMaxPacketSize = cpu_to_le16(512),
433 static struct usb_endpoint_descriptor
434 fsg_hs_bulk_out_desc = {
435 .bLength = USB_DT_ENDPOINT_SIZE,
436 .bDescriptorType = USB_DT_ENDPOINT,
438 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
439 .bmAttributes = USB_ENDPOINT_XFER_BULK,
440 .wMaxPacketSize = cpu_to_le16(512),
441 .bInterval = 1, /* NAK every 1 uframe */
444 #ifndef FSG_NO_INTR_EP
446 static struct usb_endpoint_descriptor
447 fsg_hs_intr_in_desc = {
448 .bLength = USB_DT_ENDPOINT_SIZE,
449 .bDescriptorType = USB_DT_ENDPOINT,
451 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
452 .bmAttributes = USB_ENDPOINT_XFER_INT,
453 .wMaxPacketSize = cpu_to_le16(2),
454 .bInterval = 9, /* 2**(9-1) = 256 uframes -> 32 ms */
458 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2
460 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1
465 static struct usb_descriptor_header *fsg_hs_function[] = {
467 (struct usb_descriptor_header *) &fsg_otg_desc,
469 (struct usb_descriptor_header *) &fsg_intf_desc,
470 (struct usb_descriptor_header *) &fsg_hs_bulk_in_desc,
471 (struct usb_descriptor_header *) &fsg_hs_bulk_out_desc,
472 #ifndef FSG_NO_INTR_EP
473 (struct usb_descriptor_header *) &fsg_hs_intr_in_desc,
478 static struct usb_endpoint_descriptor
479 fsg_ss_bulk_in_desc = {
480 .bLength = USB_DT_ENDPOINT_SIZE,
481 .bDescriptorType = USB_DT_ENDPOINT,
483 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
484 .bmAttributes = USB_ENDPOINT_XFER_BULK,
485 .wMaxPacketSize = cpu_to_le16(1024),
488 static struct usb_ss_ep_comp_descriptor fsg_ss_bulk_in_comp_desc = {
489 .bLength = sizeof(fsg_ss_bulk_in_comp_desc),
490 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
492 /*.bMaxBurst = DYNAMIC, */
495 static struct usb_endpoint_descriptor
496 fsg_ss_bulk_out_desc = {
497 .bLength = USB_DT_ENDPOINT_SIZE,
498 .bDescriptorType = USB_DT_ENDPOINT,
500 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
501 .bmAttributes = USB_ENDPOINT_XFER_BULK,
502 .wMaxPacketSize = cpu_to_le16(1024),
505 static struct usb_ss_ep_comp_descriptor fsg_ss_bulk_out_comp_desc = {
506 .bLength = sizeof(fsg_ss_bulk_in_comp_desc),
507 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
509 /*.bMaxBurst = DYNAMIC, */
512 #ifndef FSG_NO_INTR_EP
514 static struct usb_endpoint_descriptor
515 fsg_ss_intr_in_desc = {
516 .bLength = USB_DT_ENDPOINT_SIZE,
517 .bDescriptorType = USB_DT_ENDPOINT,
519 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
520 .bmAttributes = USB_ENDPOINT_XFER_INT,
521 .wMaxPacketSize = cpu_to_le16(2),
522 .bInterval = 9, /* 2**(9-1) = 256 uframes -> 32 ms */
525 static struct usb_ss_ep_comp_descriptor fsg_ss_intr_in_comp_desc = {
526 .bLength = sizeof(fsg_ss_bulk_in_comp_desc),
527 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
529 .wBytesPerInterval = cpu_to_le16(2),
533 # define FSG_SS_FUNCTION_PRE_EP_ENTRIES 2
535 # define FSG_SS_FUNCTION_PRE_EP_ENTRIES 1
540 static __maybe_unused struct usb_ext_cap_descriptor fsg_ext_cap_desc = {
541 .bLength = USB_DT_USB_EXT_CAP_SIZE,
542 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
543 .bDevCapabilityType = USB_CAP_TYPE_EXT,
545 .bmAttributes = cpu_to_le32(USB_LPM_SUPPORT),
548 static __maybe_unused struct usb_ss_cap_descriptor fsg_ss_cap_desc = {
549 .bLength = USB_DT_USB_SS_CAP_SIZE,
550 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
551 .bDevCapabilityType = USB_SS_CAP_TYPE,
553 /* .bmAttributes = LTM is not supported yet */
555 .wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION
556 | USB_FULL_SPEED_OPERATION
557 | USB_HIGH_SPEED_OPERATION
558 | USB_5GBPS_OPERATION),
559 .bFunctionalitySupport = USB_LOW_SPEED_OPERATION,
560 .bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT,
561 .bU2DevExitLat = cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT),
564 static __maybe_unused struct usb_bos_descriptor fsg_bos_desc = {
565 .bLength = USB_DT_BOS_SIZE,
566 .bDescriptorType = USB_DT_BOS,
568 .wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE
569 + USB_DT_USB_EXT_CAP_SIZE
570 + USB_DT_USB_SS_CAP_SIZE),
575 static struct usb_descriptor_header *fsg_ss_function[] = {
577 (struct usb_descriptor_header *) &fsg_otg_desc,
579 (struct usb_descriptor_header *) &fsg_intf_desc,
580 (struct usb_descriptor_header *) &fsg_ss_bulk_in_desc,
581 (struct usb_descriptor_header *) &fsg_ss_bulk_in_comp_desc,
582 (struct usb_descriptor_header *) &fsg_ss_bulk_out_desc,
583 (struct usb_descriptor_header *) &fsg_ss_bulk_out_comp_desc,
584 #ifndef FSG_NO_INTR_EP
585 (struct usb_descriptor_header *) &fsg_ss_intr_in_desc,
586 (struct usb_descriptor_header *) &fsg_ss_intr_in_comp_desc,
591 /* Maxpacket and other transfer characteristics vary by speed. */
592 static __maybe_unused struct usb_endpoint_descriptor *
593 fsg_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
594 struct usb_endpoint_descriptor *hs,
595 struct usb_endpoint_descriptor *ss)
597 if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
599 else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
605 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
606 static struct usb_string fsg_strings[] = {
607 #ifndef FSG_NO_DEVICE_STRINGS
608 {FSG_STRING_MANUFACTURER, fsg_string_manufacturer},
609 {FSG_STRING_PRODUCT, fsg_string_product},
610 {FSG_STRING_SERIAL, ""},
611 {FSG_STRING_CONFIG, fsg_string_config},
613 {FSG_STRING_INTERFACE, fsg_string_interface},
617 static struct usb_gadget_strings fsg_stringtab = {
618 .language = 0x0409, /* en-us */
619 .strings = fsg_strings,
623 /*-------------------------------------------------------------------------*/
626 * If the next two routines are called while the gadget is registered,
627 * the caller must own fsg->filesem for writing.
630 static int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
633 struct file *filp = NULL;
635 struct inode *inode = NULL;
640 /* R/W if we can, R/O if we must */
641 ro = curlun->initially_ro;
643 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
644 if (PTR_ERR(filp) == -EROFS || PTR_ERR(filp) == -EACCES)
648 filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
650 LINFO(curlun, "unable to open backing file: %s\n", filename);
651 return PTR_ERR(filp);
654 if (!(filp->f_mode & FMODE_WRITE))
657 if (filp->f_path.dentry)
658 inode = filp->f_path.dentry->d_inode;
659 if (!inode || (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) {
660 LINFO(curlun, "invalid file type: %s\n", filename);
665 * If we can't read the file, it's no good.
666 * If we can't write the file, use it read-only.
668 if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
669 LINFO(curlun, "file not readable: %s\n", filename);
672 if (!(filp->f_op->write || filp->f_op->aio_write))
675 size = i_size_read(inode->i_mapping->host);
677 LINFO(curlun, "unable to find file size: %s\n", filename);
683 curlun->blksize = 2048;
684 curlun->blkbits = 11;
685 } else if (inode->i_bdev) {
686 curlun->blksize = bdev_logical_block_size(inode->i_bdev);
687 curlun->blkbits = blksize_bits(curlun->blksize);
689 curlun->blksize = 512;
693 num_sectors = size >> curlun->blkbits; /* File size in logic-block-size blocks */
696 min_sectors = 300; /* Smallest track is 300 frames */
697 if (num_sectors >= 256*60*75) {
698 num_sectors = 256*60*75 - 1;
699 LINFO(curlun, "file too big: %s\n", filename);
700 LINFO(curlun, "using only first %d blocks\n",
704 if (num_sectors < min_sectors) {
705 LINFO(curlun, "file too small: %s\n", filename);
713 curlun->file_length = size;
714 curlun->num_sectors = num_sectors;
715 LDBG(curlun, "open backing file: %s\n", filename);
719 filp_close(filp, current->files);
724 static void fsg_lun_close(struct fsg_lun *curlun)
727 LDBG(curlun, "close backing file\n");
734 /*-------------------------------------------------------------------------*/
737 * Sync the file data, don't bother with the metadata.
738 * This code was copied from fs/buffer.c:sys_fdatasync().
740 static int fsg_lun_fsync_sub(struct fsg_lun *curlun)
742 struct file *filp = curlun->filp;
744 if (curlun->ro || !filp)
746 return vfs_fsync(filp, 1);
749 static void store_cdrom_address(u8 *dest, int msf, u32 addr)
752 /* Convert to Minutes-Seconds-Frames */
753 addr >>= 2; /* Convert to 2048-byte frames */
754 addr += 2*75; /* Lead-in occupies 2 seconds */
755 dest[3] = addr % 75; /* Frames */
757 dest[2] = addr % 60; /* Seconds */
759 dest[1] = addr; /* Minutes */
760 dest[0] = 0; /* Reserved */
762 /* Absolute sector */
763 put_unaligned_be32(addr, dest);
768 /*-------------------------------------------------------------------------*/
771 static ssize_t fsg_show_ro(struct device *dev, struct device_attribute *attr,
774 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
776 return sprintf(buf, "%d\n", fsg_lun_is_open(curlun)
778 : curlun->initially_ro);
781 static ssize_t fsg_show_nofua(struct device *dev, struct device_attribute *attr,
784 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
786 return sprintf(buf, "%u\n", curlun->nofua);
789 static ssize_t fsg_show_file(struct device *dev, struct device_attribute *attr,
792 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
793 struct rw_semaphore *filesem = dev_get_drvdata(dev);
798 if (fsg_lun_is_open(curlun)) { /* Get the complete pathname */
799 p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1);
805 buf[rc] = '\n'; /* Add a newline */
808 } else { /* No file, return 0 bytes */
817 static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
818 const char *buf, size_t count)
821 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
822 struct rw_semaphore *filesem = dev_get_drvdata(dev);
825 rc = kstrtouint(buf, 2, &ro);
830 * Allow the write-enable status to change only while the
831 * backing file is closed.
834 if (fsg_lun_is_open(curlun)) {
835 LDBG(curlun, "read-only status change prevented\n");
839 curlun->initially_ro = ro;
840 LDBG(curlun, "read-only status set to %d\n", curlun->ro);
847 static ssize_t fsg_store_nofua(struct device *dev,
848 struct device_attribute *attr,
849 const char *buf, size_t count)
851 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
855 ret = kstrtouint(buf, 2, &nofua);
859 /* Sync data when switching from async mode to sync */
860 if (!nofua && curlun->nofua)
861 fsg_lun_fsync_sub(curlun);
863 curlun->nofua = nofua;
868 static ssize_t fsg_store_file(struct device *dev, struct device_attribute *attr,
869 const char *buf, size_t count)
871 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
872 struct rw_semaphore *filesem = dev_get_drvdata(dev);
875 if (curlun->prevent_medium_removal && fsg_lun_is_open(curlun)) {
876 LDBG(curlun, "eject attempt prevented\n");
877 return -EBUSY; /* "Door is locked" */
880 /* Remove a trailing newline */
881 if (count > 0 && buf[count-1] == '\n')
882 ((char *) buf)[count-1] = 0; /* Ugh! */
884 /* Eject current medium */
886 if (fsg_lun_is_open(curlun)) {
887 fsg_lun_close(curlun);
888 curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
891 /* Load new medium */
892 if (count > 0 && buf[0]) {
893 rc = fsg_lun_open(curlun, buf);
895 curlun->unit_attention_data =
896 SS_NOT_READY_TO_READY_TRANSITION;
899 return (rc < 0 ? rc : count);