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 (m.nazarewicz@samsung.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.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 * This file requires the following identifiers used in USB strings to
26 * be defined (each of type pointer to char):
27 * - fsg_string_manufacturer -- name of the manufacturer
28 * - fsg_string_product -- name of the product
29 * - fsg_string_config -- name of the configuration
30 * - fsg_string_interface -- name of the interface
31 * The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS
32 * macro is defined prior to including this file.
36 * When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and
37 * fsg_hs_intr_in_desc objects as well as
38 * FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES
39 * macros are not defined.
41 * When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER,
42 * FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not
43 * defined (as well as corresponding entries in string tables are
44 * missing) and FSG_STRING_INTERFACE has value of zero.
46 * When FSG_NO_OTG is defined fsg_otg_desc won't be defined.
50 * When FSG_BUFFHD_STATIC_BUFFER is defined when this file is included
51 * the fsg_buffhd structure's buf field will be an array of FSG_BUFLEN
52 * characters rather then a pointer to void.
56 * When USB_GADGET_DEBUG_FILES is defined the module param num_buffers
57 * sets the number of pipeline buffers (length of the fsg_buffhd array).
58 * The valid range of num_buffers is: num >= 2 && num <= 4.
62 #include <linux/usb/storage.h>
63 #include <scsi/scsi.h>
64 #include <asm/unaligned.h>
68 * Thanks to NetChip Technologies for donating this product ID.
70 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
71 * Instead: allocate your own, using normal USB-IF procedures.
73 #define FSG_VENDOR_ID 0x0525 /* NetChip */
74 #define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
77 /*-------------------------------------------------------------------------*/
88 #define VLDBG(lun, fmt, args...) do { } while (0)
89 #endif /* VERBOSE_DEBUG */
91 #define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args)
92 #define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args)
93 #define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args)
94 #define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args)
97 * Keep those macros in sync with those in
98 * include/linux/usb/composite.h or else GCC will complain. If they
99 * are identical (the same names of arguments, white spaces in the
100 * same places) GCC will allow redefinition otherwise (even if some
101 * white space is removed or added) warning will be issued.
103 * Those macros are needed here because File Storage Gadget does not
104 * include the composite.h header. For composite gadgets those macros
105 * are redundant since composite.h is included any way.
107 * One could check whether those macros are already defined (which
108 * would indicate composite.h had been included) or not (which would
109 * indicate we were in FSG) but this is not done because a warning is
110 * desired if definitions here differ from the ones in composite.h.
112 * We want the definitions to match and be the same in File Storage
113 * Gadget as well as Mass Storage Function (and so composite gadgets
114 * using MSF). If someone changes them in composite.h it will produce
115 * a warning in this file when building MSF.
117 #define DBG(d, fmt, args...) dev_dbg(&(d)->gadget->dev , fmt , ## args)
118 #define VDBG(d, fmt, args...) dev_vdbg(&(d)->gadget->dev , fmt , ## args)
119 #define ERROR(d, fmt, args...) dev_err(&(d)->gadget->dev , fmt , ## args)
120 #define WARNING(d, fmt, args...) dev_warn(&(d)->gadget->dev , fmt , ## args)
121 #define INFO(d, fmt, args...) dev_info(&(d)->gadget->dev , fmt , ## args)
127 # define dump_msg(fsg, /* const char * */ label, \
128 /* const u8 * */ buf, /* unsigned */ length) do { \
129 if (length < 512) { \
130 DBG(fsg, "%s, length %u:\n", label, length); \
131 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \
132 16, 1, buf, length, 0); \
136 # define dump_cdb(fsg) do { } while (0)
140 # define dump_msg(fsg, /* const char * */ label, \
141 /* const u8 * */ buf, /* unsigned */ length) do { } while (0)
143 # ifdef VERBOSE_DEBUG
145 # define dump_cdb(fsg) \
146 print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \
147 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \
151 # define dump_cdb(fsg) do { } while (0)
153 # endif /* VERBOSE_DEBUG */
155 #endif /* DUMP_MSGS */
161 /*-------------------------------------------------------------------------*/
163 /* Bulk-only data structures */
165 /* Command Block Wrapper */
166 struct fsg_bulk_cb_wrap
{
167 __le32 Signature
; /* Contains 'USBC' */
168 u32 Tag
; /* Unique per command id */
169 __le32 DataTransferLength
; /* Size of the data */
170 u8 Flags
; /* Direction in bit 7 */
171 u8 Lun
; /* LUN (normally 0) */
172 u8 Length
; /* Of the CDB, <= MAX_COMMAND_SIZE */
173 u8 CDB
[16]; /* Command Data Block */
176 #define USB_BULK_CB_WRAP_LEN 31
177 #define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */
178 #define USB_BULK_IN_FLAG 0x80
180 /* Command Status Wrapper */
181 struct bulk_cs_wrap
{
182 __le32 Signature
; /* Should = 'USBS' */
183 u32 Tag
; /* Same as original command */
184 __le32 Residue
; /* Amount not transferred */
185 u8 Status
; /* See below */
188 #define USB_BULK_CS_WRAP_LEN 13
189 #define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */
190 #define USB_STATUS_PASS 0
191 #define USB_STATUS_FAIL 1
192 #define USB_STATUS_PHASE_ERROR 2
194 /* Bulk-only class specific requests */
195 #define USB_BULK_RESET_REQUEST 0xff
196 #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
199 /* CBI Interrupt data structure */
200 struct interrupt_data
{
205 #define CBI_INTERRUPT_DATA_LEN 2
207 /* CBI Accept Device-Specific Command request */
208 #define USB_CBI_ADSC_REQUEST 0x00
211 /* Length of a SCSI Command Data Block */
212 #define MAX_COMMAND_SIZE 16
214 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
215 #define SS_NO_SENSE 0
216 #define SS_COMMUNICATION_FAILURE 0x040800
217 #define SS_INVALID_COMMAND 0x052000
218 #define SS_INVALID_FIELD_IN_CDB 0x052400
219 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
220 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
221 #define SS_MEDIUM_NOT_PRESENT 0x023a00
222 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
223 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800
224 #define SS_RESET_OCCURRED 0x062900
225 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
226 #define SS_UNRECOVERED_READ_ERROR 0x031100
227 #define SS_WRITE_ERROR 0x030c02
228 #define SS_WRITE_PROTECTED 0x072700
230 #define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */
231 #define ASC(x) ((u8) ((x) >> 8))
232 #define ASCQ(x) ((u8) (x))
235 /*-------------------------------------------------------------------------*/
243 unsigned int initially_ro
:1;
245 unsigned int removable
:1;
246 unsigned int cdrom
:1;
247 unsigned int prevent_medium_removal
:1;
248 unsigned int registered
:1;
249 unsigned int info_valid
:1;
250 unsigned int nofua
:1;
254 u32 unit_attention_data
;
256 unsigned int blkbits
; /* Bits of logical block size of bound block device */
257 unsigned int blksize
; /* logical block size of bound block device */
261 #define fsg_lun_is_open(curlun) ((curlun)->filp != NULL)
263 static struct fsg_lun
*fsg_lun_from_dev(struct device
*dev
)
265 return container_of(dev
, struct fsg_lun
, dev
);
269 /* Big enough to hold our biggest descriptor */
270 #define EP0_BUFSIZE 256
271 #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
273 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
275 static unsigned int fsg_num_buffers
= CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
;
276 module_param_named(num_buffers
, fsg_num_buffers
, uint
, S_IRUGO
);
277 MODULE_PARM_DESC(num_buffers
, "Number of pipeline buffers");
282 * Number of buffers we will use.
283 * 2 is usually enough for good buffering pipeline
285 #define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
287 #endif /* CONFIG_USB_DEBUG */
289 /* check if fsg_num_buffers is within a valid range */
290 static inline int fsg_num_buffers_validate(void)
292 if (fsg_num_buffers
>= 2 && fsg_num_buffers
<= 4)
294 pr_err("fsg_num_buffers %u is out of range (%d to %d)\n",
295 fsg_num_buffers
, 2 ,4);
299 /* Default size of buffer length. */
300 #define FSG_BUFLEN ((u32)16384)
302 /* Maximal number of LUNs supported in mass storage function */
303 #define FSG_MAX_LUNS 8
305 enum fsg_buffer_state
{
312 #ifdef FSG_BUFFHD_STATIC_BUFFER
313 char buf
[FSG_BUFLEN
];
317 enum fsg_buffer_state state
;
318 struct fsg_buffhd
*next
;
321 * The NetChip 2280 is faster, and handles some protocol faults
322 * better, if we don't submit any short bulk-out read requests.
323 * So we will record the intended request length here.
325 unsigned int bulk_out_intended_length
;
327 struct usb_request
*inreq
;
329 struct usb_request
*outreq
;
334 /* This one isn't used anywhere */
335 FSG_STATE_COMMAND_PHASE
= -10,
336 FSG_STATE_DATA_PHASE
,
337 FSG_STATE_STATUS_PHASE
,
340 FSG_STATE_ABORT_BULK_OUT
,
342 FSG_STATE_INTERFACE_CHANGE
,
343 FSG_STATE_CONFIG_CHANGE
,
344 FSG_STATE_DISCONNECT
,
349 enum data_direction
{
350 DATA_DIR_UNKNOWN
= 0,
357 /*-------------------------------------------------------------------------*/
360 static inline u32
get_unaligned_be24(u8
*buf
)
362 return 0xffffff & (u32
) get_unaligned_be32(buf
- 1);
366 /*-------------------------------------------------------------------------*/
370 #ifndef FSG_NO_DEVICE_STRINGS
371 FSG_STRING_MANUFACTURER
= 1,
381 static struct usb_otg_descriptor
383 .bLength
= sizeof fsg_otg_desc
,
384 .bDescriptorType
= USB_DT_OTG
,
386 .bmAttributes
= USB_OTG_SRP
,
390 /* There is only one interface. */
392 static struct usb_interface_descriptor
394 .bLength
= sizeof fsg_intf_desc
,
395 .bDescriptorType
= USB_DT_INTERFACE
,
397 .bNumEndpoints
= 2, /* Adjusted during fsg_bind() */
398 .bInterfaceClass
= USB_CLASS_MASS_STORAGE
,
399 .bInterfaceSubClass
= USB_SC_SCSI
, /* Adjusted during fsg_bind() */
400 .bInterfaceProtocol
= USB_PR_BULK
, /* Adjusted during fsg_bind() */
401 .iInterface
= FSG_STRING_INTERFACE
,
405 * Three full-speed endpoint descriptors: bulk-in, bulk-out, and
409 static struct usb_endpoint_descriptor
410 fsg_fs_bulk_in_desc
= {
411 .bLength
= USB_DT_ENDPOINT_SIZE
,
412 .bDescriptorType
= USB_DT_ENDPOINT
,
414 .bEndpointAddress
= USB_DIR_IN
,
415 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
416 /* wMaxPacketSize set by autoconfiguration */
419 static struct usb_endpoint_descriptor
420 fsg_fs_bulk_out_desc
= {
421 .bLength
= USB_DT_ENDPOINT_SIZE
,
422 .bDescriptorType
= USB_DT_ENDPOINT
,
424 .bEndpointAddress
= USB_DIR_OUT
,
425 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
426 /* wMaxPacketSize set by autoconfiguration */
429 #ifndef FSG_NO_INTR_EP
431 static struct usb_endpoint_descriptor
432 fsg_fs_intr_in_desc
= {
433 .bLength
= USB_DT_ENDPOINT_SIZE
,
434 .bDescriptorType
= USB_DT_ENDPOINT
,
436 .bEndpointAddress
= USB_DIR_IN
,
437 .bmAttributes
= USB_ENDPOINT_XFER_INT
,
438 .wMaxPacketSize
= cpu_to_le16(2),
439 .bInterval
= 32, /* frames -> 32 ms */
443 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2
445 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1
450 static struct usb_descriptor_header
*fsg_fs_function
[] = {
452 (struct usb_descriptor_header
*) &fsg_otg_desc
,
454 (struct usb_descriptor_header
*) &fsg_intf_desc
,
455 (struct usb_descriptor_header
*) &fsg_fs_bulk_in_desc
,
456 (struct usb_descriptor_header
*) &fsg_fs_bulk_out_desc
,
457 #ifndef FSG_NO_INTR_EP
458 (struct usb_descriptor_header
*) &fsg_fs_intr_in_desc
,
465 * USB 2.0 devices need to expose both high speed and full speed
466 * descriptors, unless they only run at full speed.
468 * That means alternate endpoint descriptors (bigger packets)
469 * and a "device qualifier" ... plus more construction options
470 * for the configuration descriptor.
472 static struct usb_endpoint_descriptor
473 fsg_hs_bulk_in_desc
= {
474 .bLength
= USB_DT_ENDPOINT_SIZE
,
475 .bDescriptorType
= USB_DT_ENDPOINT
,
477 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
478 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
479 .wMaxPacketSize
= cpu_to_le16(512),
482 static struct usb_endpoint_descriptor
483 fsg_hs_bulk_out_desc
= {
484 .bLength
= USB_DT_ENDPOINT_SIZE
,
485 .bDescriptorType
= USB_DT_ENDPOINT
,
487 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
488 .bmAttributes
= USB_ENDPOINT_XFER_BULK
,
489 .wMaxPacketSize
= cpu_to_le16(512),
490 .bInterval
= 1, /* NAK every 1 uframe */
493 #ifndef FSG_NO_INTR_EP
495 static struct usb_endpoint_descriptor
496 fsg_hs_intr_in_desc
= {
497 .bLength
= USB_DT_ENDPOINT_SIZE
,
498 .bDescriptorType
= USB_DT_ENDPOINT
,
500 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
501 .bmAttributes
= USB_ENDPOINT_XFER_INT
,
502 .wMaxPacketSize
= cpu_to_le16(2),
503 .bInterval
= 9, /* 2**(9-1) = 256 uframes -> 32 ms */
507 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2
509 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1
514 static struct usb_descriptor_header
*fsg_hs_function
[] = {
516 (struct usb_descriptor_header
*) &fsg_otg_desc
,
518 (struct usb_descriptor_header
*) &fsg_intf_desc
,
519 (struct usb_descriptor_header
*) &fsg_hs_bulk_in_desc
,
520 (struct usb_descriptor_header
*) &fsg_hs_bulk_out_desc
,
521 #ifndef FSG_NO_INTR_EP
522 (struct usb_descriptor_header
*) &fsg_hs_intr_in_desc
,
527 /* Maxpacket and other transfer characteristics vary by speed. */
528 static __maybe_unused
struct usb_endpoint_descriptor
*
529 fsg_ep_desc(struct usb_gadget
*g
, struct usb_endpoint_descriptor
*fs
,
530 struct usb_endpoint_descriptor
*hs
)
532 if (gadget_is_dualspeed(g
) && g
->speed
== USB_SPEED_HIGH
)
538 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
539 static struct usb_string fsg_strings
[] = {
540 #ifndef FSG_NO_DEVICE_STRINGS
541 {FSG_STRING_MANUFACTURER
, fsg_string_manufacturer
},
542 {FSG_STRING_PRODUCT
, fsg_string_product
},
543 {FSG_STRING_SERIAL
, ""},
544 {FSG_STRING_CONFIG
, fsg_string_config
},
546 {FSG_STRING_INTERFACE
, fsg_string_interface
},
550 static struct usb_gadget_strings fsg_stringtab
= {
551 .language
= 0x0409, /* en-us */
552 .strings
= fsg_strings
,
556 /*-------------------------------------------------------------------------*/
559 * If the next two routines are called while the gadget is registered,
560 * the caller must own fsg->filesem for writing.
563 static int fsg_lun_open(struct fsg_lun
*curlun
, const char *filename
)
566 struct file
*filp
= NULL
;
568 struct inode
*inode
= NULL
;
573 /* R/W if we can, R/O if we must */
574 ro
= curlun
->initially_ro
;
576 filp
= filp_open(filename
, O_RDWR
| O_LARGEFILE
, 0);
577 if (PTR_ERR(filp
) == -EROFS
|| PTR_ERR(filp
) == -EACCES
)
581 filp
= filp_open(filename
, O_RDONLY
| O_LARGEFILE
, 0);
583 LINFO(curlun
, "unable to open backing file: %s\n", filename
);
584 return PTR_ERR(filp
);
587 if (!(filp
->f_mode
& FMODE_WRITE
))
590 if (filp
->f_path
.dentry
)
591 inode
= filp
->f_path
.dentry
->d_inode
;
592 if (!inode
|| (!S_ISREG(inode
->i_mode
) && !S_ISBLK(inode
->i_mode
))) {
593 LINFO(curlun
, "invalid file type: %s\n", filename
);
598 * If we can't read the file, it's no good.
599 * If we can't write the file, use it read-only.
601 if (!filp
->f_op
|| !(filp
->f_op
->read
|| filp
->f_op
->aio_read
)) {
602 LINFO(curlun
, "file not readable: %s\n", filename
);
605 if (!(filp
->f_op
->write
|| filp
->f_op
->aio_write
))
608 size
= i_size_read(inode
->i_mapping
->host
);
610 LINFO(curlun
, "unable to find file size: %s\n", filename
);
616 curlun
->blksize
= 2048;
617 curlun
->blkbits
= 11;
618 } else if (inode
->i_bdev
) {
619 curlun
->blksize
= bdev_logical_block_size(inode
->i_bdev
);
620 curlun
->blkbits
= blksize_bits(curlun
->blksize
);
622 curlun
->blksize
= 512;
626 num_sectors
= size
>> curlun
->blkbits
; /* File size in logic-block-size blocks */
629 min_sectors
= 300; /* Smallest track is 300 frames */
630 if (num_sectors
>= 256*60*75) {
631 num_sectors
= 256*60*75 - 1;
632 LINFO(curlun
, "file too big: %s\n", filename
);
633 LINFO(curlun
, "using only first %d blocks\n",
637 if (num_sectors
< min_sectors
) {
638 LINFO(curlun
, "file too small: %s\n", filename
);
646 curlun
->file_length
= size
;
647 curlun
->num_sectors
= num_sectors
;
648 LDBG(curlun
, "open backing file: %s\n", filename
);
652 filp_close(filp
, current
->files
);
657 static void fsg_lun_close(struct fsg_lun
*curlun
)
660 LDBG(curlun
, "close backing file\n");
667 /*-------------------------------------------------------------------------*/
670 * Sync the file data, don't bother with the metadata.
671 * This code was copied from fs/buffer.c:sys_fdatasync().
673 static int fsg_lun_fsync_sub(struct fsg_lun
*curlun
)
675 struct file
*filp
= curlun
->filp
;
677 if (curlun
->ro
|| !filp
)
679 return vfs_fsync(filp
, 1);
682 static void store_cdrom_address(u8
*dest
, int msf
, u32 addr
)
685 /* Convert to Minutes-Seconds-Frames */
686 addr
>>= 2; /* Convert to 2048-byte frames */
687 addr
+= 2*75; /* Lead-in occupies 2 seconds */
688 dest
[3] = addr
% 75; /* Frames */
690 dest
[2] = addr
% 60; /* Seconds */
692 dest
[1] = addr
; /* Minutes */
693 dest
[0] = 0; /* Reserved */
695 /* Absolute sector */
696 put_unaligned_be32(addr
, dest
);
701 /*-------------------------------------------------------------------------*/
704 static ssize_t
fsg_show_ro(struct device
*dev
, struct device_attribute
*attr
,
707 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
709 return sprintf(buf
, "%d\n", fsg_lun_is_open(curlun
)
711 : curlun
->initially_ro
);
714 static ssize_t
fsg_show_nofua(struct device
*dev
, struct device_attribute
*attr
,
717 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
719 return sprintf(buf
, "%u\n", curlun
->nofua
);
722 static ssize_t
fsg_show_file(struct device
*dev
, struct device_attribute
*attr
,
725 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
726 struct rw_semaphore
*filesem
= dev_get_drvdata(dev
);
731 if (fsg_lun_is_open(curlun
)) { /* Get the complete pathname */
732 p
= d_path(&curlun
->filp
->f_path
, buf
, PAGE_SIZE
- 1);
738 buf
[rc
] = '\n'; /* Add a newline */
741 } else { /* No file, return 0 bytes */
750 static ssize_t
fsg_store_ro(struct device
*dev
, struct device_attribute
*attr
,
751 const char *buf
, size_t count
)
754 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
755 struct rw_semaphore
*filesem
= dev_get_drvdata(dev
);
758 rc
= kstrtouint(buf
, 2, &ro
);
763 * Allow the write-enable status to change only while the
764 * backing file is closed.
767 if (fsg_lun_is_open(curlun
)) {
768 LDBG(curlun
, "read-only status change prevented\n");
772 curlun
->initially_ro
= ro
;
773 LDBG(curlun
, "read-only status set to %d\n", curlun
->ro
);
780 static ssize_t
fsg_store_nofua(struct device
*dev
,
781 struct device_attribute
*attr
,
782 const char *buf
, size_t count
)
784 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
788 ret
= kstrtouint(buf
, 2, &nofua
);
792 /* Sync data when switching from async mode to sync */
793 if (!nofua
&& curlun
->nofua
)
794 fsg_lun_fsync_sub(curlun
);
796 curlun
->nofua
= nofua
;
801 static ssize_t
fsg_store_file(struct device
*dev
, struct device_attribute
*attr
,
802 const char *buf
, size_t count
)
804 struct fsg_lun
*curlun
= fsg_lun_from_dev(dev
);
805 struct rw_semaphore
*filesem
= dev_get_drvdata(dev
);
808 if (curlun
->prevent_medium_removal
&& fsg_lun_is_open(curlun
)) {
809 LDBG(curlun
, "eject attempt prevented\n");
810 return -EBUSY
; /* "Door is locked" */
813 /* Remove a trailing newline */
814 if (count
> 0 && buf
[count
-1] == '\n')
815 ((char *) buf
)[count
-1] = 0; /* Ugh! */
817 /* Eject current medium */
819 if (fsg_lun_is_open(curlun
)) {
820 fsg_lun_close(curlun
);
821 curlun
->unit_attention_data
= SS_MEDIUM_NOT_PRESENT
;
824 /* Load new medium */
825 if (count
> 0 && buf
[0]) {
826 rc
= fsg_lun_open(curlun
, buf
);
828 curlun
->unit_attention_data
=
829 SS_NOT_READY_TO_READY_TRANSITION
;
832 return (rc
< 0 ? rc
: count
);