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 USB_GADGET_DEBUG_FILES is defined the module param num_buffers
42 * sets the number of pipeline buffers (length of the fsg_buffhd array).
43 * The valid range of num_buffers is: num >= 2 && num <= 4.
47 #include <linux/usb/storage.h>
48 #include <scsi/scsi.h>
49 #include <asm/unaligned.h>
53 * Thanks to NetChip Technologies for donating this product ID.
55 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
56 * Instead: allocate your own, using normal USB-IF procedures.
58 #define FSG_VENDOR_ID 0x0525 /* NetChip */
59 #define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
62 /*-------------------------------------------------------------------------*/
73 #define VLDBG(lun, fmt, args...) do { } while (0)
74 #endif /* VERBOSE_DEBUG */
76 #define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args)
77 #define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args)
78 #define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args)
79 #define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args)
82 * Keep those macros in sync with those in
83 * include/linux/usb/composite.h or else GCC will complain. If they
84 * are identical (the same names of arguments, white spaces in the
85 * same places) GCC will allow redefinition otherwise (even if some
86 * white space is removed or added) warning will be issued.
88 * Those macros are needed here because File Storage Gadget does not
89 * include the composite.h header. For composite gadgets those macros
90 * are redundant since composite.h is included any way.
92 * One could check whether those macros are already defined (which
93 * would indicate composite.h had been included) or not (which would
94 * indicate we were in FSG) but this is not done because a warning is
95 * desired if definitions here differ from the ones in composite.h.
97 * We want the definitions to match and be the same in File Storage
98 * Gadget as well as Mass Storage Function (and so composite gadgets
99 * using MSF). If someone changes them in composite.h it will produce
100 * a warning in this file when building MSF.
102 #define DBG(d, fmt, args...) dev_dbg(&(d)->gadget->dev , fmt , ## args)
103 #define VDBG(d, fmt, args...) dev_vdbg(&(d)->gadget->dev , fmt , ## args)
104 #define ERROR(d, fmt, args...) dev_err(&(d)->gadget->dev , fmt , ## args)
105 #define WARNING(d, fmt, args...) dev_warn(&(d)->gadget->dev , fmt , ## args)
106 #define INFO(d, fmt, args...) dev_info(&(d)->gadget->dev , fmt , ## args)
112 # define dump_msg(fsg, /* const char * */ label, \
113 /* const u8 * */ buf, /* unsigned */ length) do { \
114 if (length < 512) { \
115 DBG(fsg, "%s, length %u:\n", label, length); \
116 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \
117 16, 1, buf, length, 0); \
121 # define dump_cdb(fsg) do { } while (0)
125 # define dump_msg(fsg, /* const char * */ label, \
126 /* const u8 * */ buf, /* unsigned */ length) do { } while (0)
128 # ifdef VERBOSE_DEBUG
130 # define dump_cdb(fsg) \
131 print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \
132 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \
136 # define dump_cdb(fsg) do { } while (0)
138 # endif /* VERBOSE_DEBUG */
140 #endif /* DUMP_MSGS */
142 /*-------------------------------------------------------------------------*/
144 /* CBI Interrupt data structure */
145 struct interrupt_data
{
150 #define CBI_INTERRUPT_DATA_LEN 2
152 /* CBI Accept Device-Specific Command request */
153 #define USB_CBI_ADSC_REQUEST 0x00
156 /* Length of a SCSI Command Data Block */
157 #define MAX_COMMAND_SIZE 16
159 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
160 #define SS_NO_SENSE 0
161 #define SS_COMMUNICATION_FAILURE 0x040800
162 #define SS_INVALID_COMMAND 0x052000
163 #define SS_INVALID_FIELD_IN_CDB 0x052400
164 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
165 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
166 #define SS_MEDIUM_NOT_PRESENT 0x023a00
167 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
168 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800
169 #define SS_RESET_OCCURRED 0x062900
170 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
171 #define SS_UNRECOVERED_READ_ERROR 0x031100
172 #define SS_WRITE_ERROR 0x030c02
173 #define SS_WRITE_PROTECTED 0x072700
175 #define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */
176 #define ASC(x) ((u8) ((x) >> 8))
177 #define ASCQ(x) ((u8) (x))
180 /*-------------------------------------------------------------------------*/
188 unsigned int initially_ro
:1;
190 unsigned int removable
:1;
191 unsigned int cdrom
:1;
192 unsigned int prevent_medium_removal
:1;
193 unsigned int registered
:1;
194 unsigned int info_valid
:1;
195 unsigned int nofua
:1;
199 u32 unit_attention_data
;
201 unsigned int blkbits
; /* Bits of logical block size of bound block device */
202 unsigned int blksize
; /* logical block size of bound block device */
206 #define fsg_lun_is_open(curlun) ((curlun)->filp != NULL)
208 static struct fsg_lun
*fsg_lun_from_dev(struct device
*dev
)
210 return container_of(dev
, struct fsg_lun
, dev
);
214 /* Big enough to hold our biggest descriptor */
215 #define EP0_BUFSIZE 256
216 #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
218 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
220 static unsigned int fsg_num_buffers
= CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
;
221 module_param_named(num_buffers
, fsg_num_buffers
, uint
, S_IRUGO
);
222 MODULE_PARM_DESC(num_buffers
, "Number of pipeline buffers");
227 * Number of buffers we will use.
228 * 2 is usually enough for good buffering pipeline
230 #define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
232 #endif /* CONFIG_USB_DEBUG */
234 /* check if fsg_num_buffers is within a valid range */
235 static inline int fsg_num_buffers_validate(void)
237 if (fsg_num_buffers
>= 2 && fsg_num_buffers
<= 4)
239 pr_err("fsg_num_buffers %u is out of range (%d to %d)\n",
240 fsg_num_buffers
, 2 ,4);
244 /* Default size of buffer length. */
245 #define FSG_BUFLEN ((u32)16384)
247 /* Maximal number of LUNs supported in mass storage function */
248 #define FSG_MAX_LUNS 8
250 enum fsg_buffer_state
{
258 enum fsg_buffer_state state
;
259 struct fsg_buffhd
*next
;
262 * The NetChip 2280 is faster, and handles some protocol faults
263 * better, if we don't submit any short bulk-out read requests.
264 * So we will record the intended request length here.
266 unsigned int bulk_out_intended_length
;
268 struct usb_request
*inreq
;
270 struct usb_request
*outreq
;
275 /* This one isn't used anywhere */
276 FSG_STATE_COMMAND_PHASE
= -10,
277 FSG_STATE_DATA_PHASE
,
278 FSG_STATE_STATUS_PHASE
,
281 FSG_STATE_ABORT_BULK_OUT
,
283 FSG_STATE_INTERFACE_CHANGE
,
284 FSG_STATE_CONFIG_CHANGE
,
285 FSG_STATE_DISCONNECT
,
290 enum data_direction
{
291 DATA_DIR_UNKNOWN
= 0,
298 /*-------------------------------------------------------------------------*/
301 static inline u32
get_unaligned_be24(u8
*buf
)
303 return 0xffffff & (u32
) get_unaligned_be32(buf
- 1);
307 /*-------------------------------------------------------------------------*/
311 #ifndef FSG_NO_DEVICE_STRINGS
312 FSG_STRING_MANUFACTURER
= 1,
322 static struct usb_otg_descriptor
324 .bLength
= sizeof fsg_otg_desc
,
325 .bDescriptorType
= USB_DT_OTG
,
327 .bmAttributes
= USB_OTG_SRP
,
331 /* There is only one interface. */
333 static struct usb_interface_descriptor
335 .bLength
= sizeof fsg_intf_desc
,
336 .bDescriptorType
= USB_DT_INTERFACE
,
338 .bNumEndpoints
= 2, /* Adjusted during fsg_bind() */
339 .bInterfaceClass
= USB_CLASS_MASS_STORAGE
,
340 .bInterfaceSubClass
= USB_SC_SCSI
, /* Adjusted during fsg_bind() */
341 .bInterfaceProtocol
= USB_PR_BULK
, /* Adjusted during fsg_bind() */
342 .iInterface
= FSG_STRING_INTERFACE
,
346 * Three full-speed endpoint descriptors: bulk-in, bulk-out, and
350 static struct usb_endpoint_descriptor
351 fsg_fs_bulk_in_desc
= {
352 .bLength
= USB_DT_ENDPOINT_SIZE
,
353 .bDescriptorType
= USB_DT_ENDPOINT
,
355 .bEndpointAddress
= USB_DIR_IN
,
356 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
357 /* wMaxPacketSize set by autoconfiguration */
360 static struct usb_endpoint_descriptor
361 fsg_fs_bulk_out_desc
= {
362 .bLength
= USB_DT_ENDPOINT_SIZE
,
363 .bDescriptorType
= USB_DT_ENDPOINT
,
365 .bEndpointAddress
= USB_DIR_OUT
,
366 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
367 /* wMaxPacketSize set by autoconfiguration */
370 #ifndef FSG_NO_INTR_EP
372 static struct usb_endpoint_descriptor
373 fsg_fs_intr_in_desc
= {
374 .bLength
= USB_DT_ENDPOINT_SIZE
,
375 .bDescriptorType
= USB_DT_ENDPOINT
,
377 .bEndpointAddress
= USB_DIR_IN
,
378 .bmAttributes
= USB_ENDPOINT_XFER_INT
,
379 .wMaxPacketSize
= cpu_to_le16(2),
380 .bInterval
= 32, /* frames -> 32 ms */
384 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2
386 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1
391 static struct usb_descriptor_header
*fsg_fs_function
[] = {
393 (struct usb_descriptor_header
*) &fsg_otg_desc
,
395 (struct usb_descriptor_header
*) &fsg_intf_desc
,
396 (struct usb_descriptor_header
*) &fsg_fs_bulk_in_desc
,
397 (struct usb_descriptor_header
*) &fsg_fs_bulk_out_desc
,
398 #ifndef FSG_NO_INTR_EP
399 (struct usb_descriptor_header
*) &fsg_fs_intr_in_desc
,
406 * USB 2.0 devices need to expose both high speed and full speed
407 * descriptors, unless they only run at full speed.
409 * That means alternate endpoint descriptors (bigger packets)
410 * and a "device qualifier" ... plus more construction options
411 * for the configuration descriptor.
413 static struct usb_endpoint_descriptor
414 fsg_hs_bulk_in_desc
= {
415 .bLength
= USB_DT_ENDPOINT_SIZE
,
416 .bDescriptorType
= USB_DT_ENDPOINT
,
418 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
419 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
420 .wMaxPacketSize
= cpu_to_le16(512),
423 static struct usb_endpoint_descriptor
424 fsg_hs_bulk_out_desc
= {
425 .bLength
= USB_DT_ENDPOINT_SIZE
,
426 .bDescriptorType
= USB_DT_ENDPOINT
,
428 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
429 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
430 .wMaxPacketSize
= cpu_to_le16(512),
431 .bInterval
= 1, /* NAK every 1 uframe */
434 #ifndef FSG_NO_INTR_EP
436 static struct usb_endpoint_descriptor
437 fsg_hs_intr_in_desc
= {
438 .bLength
= USB_DT_ENDPOINT_SIZE
,
439 .bDescriptorType
= USB_DT_ENDPOINT
,
441 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
442 .bmAttributes
= USB_ENDPOINT_XFER_INT
,
443 .wMaxPacketSize
= cpu_to_le16(2),
444 .bInterval
= 9, /* 2**(9-1) = 256 uframes -> 32 ms */
448 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2
450 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1
455 static struct usb_descriptor_header
*fsg_hs_function
[] = {
457 (struct usb_descriptor_header
*) &fsg_otg_desc
,
459 (struct usb_descriptor_header
*) &fsg_intf_desc
,
460 (struct usb_descriptor_header
*) &fsg_hs_bulk_in_desc
,
461 (struct usb_descriptor_header
*) &fsg_hs_bulk_out_desc
,
462 #ifndef FSG_NO_INTR_EP
463 (struct usb_descriptor_header
*) &fsg_hs_intr_in_desc
,
468 static struct usb_endpoint_descriptor
469 fsg_ss_bulk_in_desc
= {
470 .bLength
= USB_DT_ENDPOINT_SIZE
,
471 .bDescriptorType
= USB_DT_ENDPOINT
,
473 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
474 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
475 .wMaxPacketSize
= cpu_to_le16(1024),
478 static struct usb_ss_ep_comp_descriptor fsg_ss_bulk_in_comp_desc
= {
479 .bLength
= sizeof(fsg_ss_bulk_in_comp_desc
),
480 .bDescriptorType
= USB_DT_SS_ENDPOINT_COMP
,
482 /*.bMaxBurst = DYNAMIC, */
485 static struct usb_endpoint_descriptor
486 fsg_ss_bulk_out_desc
= {
487 .bLength
= USB_DT_ENDPOINT_SIZE
,
488 .bDescriptorType
= USB_DT_ENDPOINT
,
490 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
491 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
492 .wMaxPacketSize
= cpu_to_le16(1024),
495 static struct usb_ss_ep_comp_descriptor fsg_ss_bulk_out_comp_desc
= {
496 .bLength
= sizeof(fsg_ss_bulk_in_comp_desc
),
497 .bDescriptorType
= USB_DT_SS_ENDPOINT_COMP
,
499 /*.bMaxBurst = DYNAMIC, */
502 #ifndef FSG_NO_INTR_EP
504 static struct usb_endpoint_descriptor
505 fsg_ss_intr_in_desc
= {
506 .bLength
= USB_DT_ENDPOINT_SIZE
,
507 .bDescriptorType
= USB_DT_ENDPOINT
,
509 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
510 .bmAttributes
= USB_ENDPOINT_XFER_INT
,
511 .wMaxPacketSize
= cpu_to_le16(2),
512 .bInterval
= 9, /* 2**(9-1) = 256 uframes -> 32 ms */
515 static struct usb_ss_ep_comp_descriptor fsg_ss_intr_in_comp_desc
= {
516 .bLength
= sizeof(fsg_ss_bulk_in_comp_desc
),
517 .bDescriptorType
= USB_DT_SS_ENDPOINT_COMP
,
519 .wBytesPerInterval
= cpu_to_le16(2),
523 # define FSG_SS_FUNCTION_PRE_EP_ENTRIES 2
525 # define FSG_SS_FUNCTION_PRE_EP_ENTRIES 1
530 static __maybe_unused
struct usb_ext_cap_descriptor fsg_ext_cap_desc
= {
531 .bLength
= USB_DT_USB_EXT_CAP_SIZE
,
532 .bDescriptorType
= USB_DT_DEVICE_CAPABILITY
,
533 .bDevCapabilityType
= USB_CAP_TYPE_EXT
,
535 .bmAttributes
= cpu_to_le32(USB_LPM_SUPPORT
),
538 static __maybe_unused
struct usb_ss_cap_descriptor fsg_ss_cap_desc
= {
539 .bLength
= USB_DT_USB_SS_CAP_SIZE
,
540 .bDescriptorType
= USB_DT_DEVICE_CAPABILITY
,
541 .bDevCapabilityType
= USB_SS_CAP_TYPE
,
543 /* .bmAttributes = LTM is not supported yet */
545 .wSpeedSupported
= cpu_to_le16(USB_LOW_SPEED_OPERATION
546 | USB_FULL_SPEED_OPERATION
547 | USB_HIGH_SPEED_OPERATION
548 | USB_5GBPS_OPERATION
),
549 .bFunctionalitySupport
= USB_LOW_SPEED_OPERATION
,
550 .bU1devExitLat
= USB_DEFAULT_U1_DEV_EXIT_LAT
,
551 .bU2DevExitLat
= cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT
),
554 static __maybe_unused
struct usb_bos_descriptor fsg_bos_desc
= {
555 .bLength
= USB_DT_BOS_SIZE
,
556 .bDescriptorType
= USB_DT_BOS
,
558 .wTotalLength
= cpu_to_le16(USB_DT_BOS_SIZE
559 + USB_DT_USB_EXT_CAP_SIZE
560 + USB_DT_USB_SS_CAP_SIZE
),
565 static struct usb_descriptor_header
*fsg_ss_function
[] = {
567 (struct usb_descriptor_header
*) &fsg_otg_desc
,
569 (struct usb_descriptor_header
*) &fsg_intf_desc
,
570 (struct usb_descriptor_header
*) &fsg_ss_bulk_in_desc
,
571 (struct usb_descriptor_header
*) &fsg_ss_bulk_in_comp_desc
,
572 (struct usb_descriptor_header
*) &fsg_ss_bulk_out_desc
,
573 (struct usb_descriptor_header
*) &fsg_ss_bulk_out_comp_desc
,
574 #ifndef FSG_NO_INTR_EP
575 (struct usb_descriptor_header
*) &fsg_ss_intr_in_desc
,
576 (struct usb_descriptor_header
*) &fsg_ss_intr_in_comp_desc
,
581 /* Maxpacket and other transfer characteristics vary by speed. */
582 static __maybe_unused
struct usb_endpoint_descriptor
*
583 fsg_ep_desc(struct usb_gadget
*g
, struct usb_endpoint_descriptor
*fs
,
584 struct usb_endpoint_descriptor
*hs
,
585 struct usb_endpoint_descriptor
*ss
)
587 if (gadget_is_superspeed(g
) && g
->speed
== USB_SPEED_SUPER
)
589 else if (gadget_is_dualspeed(g
) && g
->speed
== USB_SPEED_HIGH
)
595 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
596 static struct usb_string fsg_strings
[] = {
597 #ifndef FSG_NO_DEVICE_STRINGS
598 {FSG_STRING_MANUFACTURER
, fsg_string_manufacturer
},
599 {FSG_STRING_PRODUCT
, fsg_string_product
},
600 {FSG_STRING_SERIAL
, ""},
601 {FSG_STRING_CONFIG
, fsg_string_config
},
603 {FSG_STRING_INTERFACE
, fsg_string_interface
},
607 static struct usb_gadget_strings fsg_stringtab
= {
608 .language
= 0x0409, /* en-us */
609 .strings
= fsg_strings
,
613 /*-------------------------------------------------------------------------*/
616 * If the next two routines are called while the gadget is registered,
617 * the caller must own fsg->filesem for writing.
620 static void fsg_lun_close(struct fsg_lun
*curlun
)
623 LDBG(curlun
, "close backing file\n");
630 static int fsg_lun_open(struct fsg_lun
*curlun
, const char *filename
)
633 struct file
*filp
= NULL
;
635 struct inode
*inode
= NULL
;
639 unsigned int blkbits
;
640 unsigned int blksize
;
642 /* R/W if we can, R/O if we must */
643 ro
= curlun
->initially_ro
;
645 filp
= filp_open(filename
, O_RDWR
| O_LARGEFILE
, 0);
646 if (PTR_ERR(filp
) == -EROFS
|| PTR_ERR(filp
) == -EACCES
)
650 filp
= filp_open(filename
, O_RDONLY
| O_LARGEFILE
, 0);
652 LINFO(curlun
, "unable to open backing file: %s\n", filename
);
653 return PTR_ERR(filp
);
656 if (!(filp
->f_mode
& FMODE_WRITE
))
659 inode
= file_inode(filp
);
660 if ((!S_ISREG(inode
->i_mode
) && !S_ISBLK(inode
->i_mode
))) {
661 LINFO(curlun
, "invalid file type: %s\n", filename
);
666 * If we can't read the file, it's no good.
667 * If we can't write the file, use it read-only.
669 if (!(filp
->f_op
->read
|| filp
->f_op
->aio_read
)) {
670 LINFO(curlun
, "file not readable: %s\n", filename
);
673 if (!(filp
->f_op
->write
|| filp
->f_op
->aio_write
))
676 size
= i_size_read(inode
->i_mapping
->host
);
678 LINFO(curlun
, "unable to find file size: %s\n", filename
);
686 } else if (inode
->i_bdev
) {
687 blksize
= bdev_logical_block_size(inode
->i_bdev
);
688 blkbits
= blksize_bits(blksize
);
694 num_sectors
= size
>> blkbits
; /* File size in logic-block-size blocks */
697 min_sectors
= 300; /* Smallest track is 300 frames */
698 if (num_sectors
>= 256*60*75) {
699 num_sectors
= 256*60*75 - 1;
700 LINFO(curlun
, "file too big: %s\n", filename
);
701 LINFO(curlun
, "using only first %d blocks\n",
705 if (num_sectors
< min_sectors
) {
706 LINFO(curlun
, "file too small: %s\n", filename
);
711 if (fsg_lun_is_open(curlun
))
712 fsg_lun_close(curlun
);
714 curlun
->blksize
= blksize
;
715 curlun
->blkbits
= blkbits
;
718 curlun
->file_length
= size
;
719 curlun
->num_sectors
= num_sectors
;
720 LDBG(curlun
, "open backing file: %s\n", filename
);
729 /*-------------------------------------------------------------------------*/
732 * Sync the file data, don't bother with the metadata.
733 * This code was copied from fs/buffer.c:sys_fdatasync().
735 static int fsg_lun_fsync_sub(struct fsg_lun
*curlun
)
737 struct file
*filp
= curlun
->filp
;
739 if (curlun
->ro
|| !filp
)
741 return vfs_fsync(filp
, 1);
744 static void store_cdrom_address(u8
*dest
, int msf
, u32 addr
)
747 /* Convert to Minutes-Seconds-Frames */
748 addr
>>= 2; /* Convert to 2048-byte frames */
749 addr
+= 2*75; /* Lead-in occupies 2 seconds */
750 dest
[3] = addr
% 75; /* Frames */
752 dest
[2] = addr
% 60; /* Seconds */
754 dest
[1] = addr
; /* Minutes */
755 dest
[0] = 0; /* Reserved */
757 /* Absolute sector */
758 put_unaligned_be32(addr
, dest
);
763 /*-------------------------------------------------------------------------*/
766 static ssize_t
fsg_show_ro(struct device
*dev
, struct device_attribute
*attr
,
769 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
771 return sprintf(buf
, "%d\n", fsg_lun_is_open(curlun
)
773 : curlun
->initially_ro
);
776 static ssize_t
fsg_show_nofua(struct device
*dev
, struct device_attribute
*attr
,
779 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
781 return sprintf(buf
, "%u\n", curlun
->nofua
);
784 static ssize_t
fsg_show_file(struct device
*dev
, struct device_attribute
*attr
,
787 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
788 struct rw_semaphore
*filesem
= dev_get_drvdata(dev
);
793 if (fsg_lun_is_open(curlun
)) { /* Get the complete pathname */
794 p
= d_path(&curlun
->filp
->f_path
, buf
, PAGE_SIZE
- 1);
800 buf
[rc
] = '\n'; /* Add a newline */
803 } else { /* No file, return 0 bytes */
812 static ssize_t
fsg_store_ro(struct device
*dev
, struct device_attribute
*attr
,
813 const char *buf
, size_t count
)
816 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
817 struct rw_semaphore
*filesem
= dev_get_drvdata(dev
);
820 rc
= kstrtouint(buf
, 2, &ro
);
825 * Allow the write-enable status to change only while the
826 * backing file is closed.
829 if (fsg_lun_is_open(curlun
)) {
830 LDBG(curlun
, "read-only status change prevented\n");
834 curlun
->initially_ro
= ro
;
835 LDBG(curlun
, "read-only status set to %d\n", curlun
->ro
);
842 static ssize_t
fsg_store_nofua(struct device
*dev
,
843 struct device_attribute
*attr
,
844 const char *buf
, size_t count
)
846 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
850 ret
= kstrtouint(buf
, 2, &nofua
);
854 /* Sync data when switching from async mode to sync */
855 if (!nofua
&& curlun
->nofua
)
856 fsg_lun_fsync_sub(curlun
);
858 curlun
->nofua
= nofua
;
863 static ssize_t
fsg_store_file(struct device
*dev
, struct device_attribute
*attr
,
864 const char *buf
, size_t count
)
866 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
867 struct rw_semaphore
*filesem
= dev_get_drvdata(dev
);
870 if (curlun
->prevent_medium_removal
&& fsg_lun_is_open(curlun
)) {
871 LDBG(curlun
, "eject attempt prevented\n");
872 return -EBUSY
; /* "Door is locked" */
875 /* Remove a trailing newline */
876 if (count
> 0 && buf
[count
-1] == '\n')
877 ((char *) buf
)[count
-1] = 0; /* Ugh! */
879 /* Load new medium */
881 if (count
> 0 && buf
[0]) {
882 /* fsg_lun_open() will close existing file if any. */
883 rc
= fsg_lun_open(curlun
, buf
);
885 curlun
->unit_attention_data
=
886 SS_NOT_READY_TO_READY_TRANSITION
;
887 } else if (fsg_lun_is_open(curlun
)) {
888 fsg_lun_close(curlun
);
889 curlun
->unit_attention_data
= SS_MEDIUM_NOT_PRESENT
;
892 return (rc
< 0 ? rc
: count
);