Commit | Line | Data |
---|---|---|
b6058d0f MN |
1 | /* |
2 | * storage_common.c -- Common definitions for mass storage functionality | |
3 | * | |
4 | * Copyright (C) 2003-2008 Alan Stern | |
5 | * Copyeight (C) 2009 Samsung Electronics | |
54b8360f | 6 | * Author: Michal Nazarewicz (mina86@mina86.com) |
d6181702 MN |
7 | * |
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. | |
d6181702 MN |
12 | */ |
13 | ||
d6181702 MN |
14 | /* |
15 | * This file requires the following identifiers used in USB strings to | |
16 | * be defined (each of type pointer to char): | |
d6181702 | 17 | * - fsg_string_interface -- name of the interface |
93bcf12e MN |
18 | */ |
19 | ||
6532c7fd PF |
20 | /* |
21 | * When USB_GADGET_DEBUG_FILES is defined the module param num_buffers | |
22 | * sets the number of pipeline buffers (length of the fsg_buffhd array). | |
23 | * The valid range of num_buffers is: num >= 2 && num <= 4. | |
24 | */ | |
25 | ||
b6058d0f | 26 | |
3323b710 | 27 | #include <linux/usb/storage.h> |
0a6a717c MN |
28 | #include <scsi/scsi.h> |
29 | #include <asm/unaligned.h> | |
d6181702 | 30 | |
b6058d0f | 31 | |
d0893264 MN |
32 | /* |
33 | * Thanks to NetChip Technologies for donating this product ID. | |
93f93740 MN |
34 | * |
35 | * DO NOT REUSE THESE IDs with any other driver!! Ever!! | |
d0893264 MN |
36 | * Instead: allocate your own, using normal USB-IF procedures. |
37 | */ | |
d26a6aa0 MN |
38 | #define FSG_VENDOR_ID 0x0525 /* NetChip */ |
39 | #define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */ | |
93f93740 MN |
40 | |
41 | ||
b6058d0f MN |
42 | /*-------------------------------------------------------------------------*/ |
43 | ||
44 | ||
45 | #ifndef DEBUG | |
46 | #undef VERBOSE_DEBUG | |
47 | #undef DUMP_MSGS | |
48 | #endif /* !DEBUG */ | |
49 | ||
50 | #ifdef VERBOSE_DEBUG | |
51 | #define VLDBG LDBG | |
52 | #else | |
53 | #define VLDBG(lun, fmt, args...) do { } while (0) | |
54 | #endif /* VERBOSE_DEBUG */ | |
55 | ||
56 | #define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args) | |
57 | #define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args) | |
58 | #define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args) | |
59 | #define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args) | |
60 | ||
b6058d0f MN |
61 | |
62 | #ifdef DUMP_MSGS | |
63 | ||
64 | # define dump_msg(fsg, /* const char * */ label, \ | |
d26a6aa0 | 65 | /* const u8 * */ buf, /* unsigned */ length) do { \ |
b6058d0f MN |
66 | if (length < 512) { \ |
67 | DBG(fsg, "%s, length %u:\n", label, length); \ | |
68 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \ | |
69 | 16, 1, buf, length, 0); \ | |
70 | } \ | |
71 | } while (0) | |
72 | ||
73 | # define dump_cdb(fsg) do { } while (0) | |
74 | ||
75 | #else | |
76 | ||
77 | # define dump_msg(fsg, /* const char * */ label, \ | |
d26a6aa0 | 78 | /* const u8 * */ buf, /* unsigned */ length) do { } while (0) |
b6058d0f MN |
79 | |
80 | # ifdef VERBOSE_DEBUG | |
81 | ||
d26a6aa0 | 82 | # define dump_cdb(fsg) \ |
b6058d0f MN |
83 | print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \ |
84 | 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \ | |
85 | ||
86 | # else | |
87 | ||
88 | # define dump_cdb(fsg) do { } while (0) | |
89 | ||
90 | # endif /* VERBOSE_DEBUG */ | |
91 | ||
92 | #endif /* DUMP_MSGS */ | |
93 | ||
b6058d0f MN |
94 | /*-------------------------------------------------------------------------*/ |
95 | ||
d26a6aa0 MN |
96 | /* Length of a SCSI Command Data Block */ |
97 | #define MAX_COMMAND_SIZE 16 | |
b6058d0f | 98 | |
b6058d0f MN |
99 | /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */ |
100 | #define SS_NO_SENSE 0 | |
101 | #define SS_COMMUNICATION_FAILURE 0x040800 | |
102 | #define SS_INVALID_COMMAND 0x052000 | |
103 | #define SS_INVALID_FIELD_IN_CDB 0x052400 | |
104 | #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100 | |
105 | #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500 | |
106 | #define SS_MEDIUM_NOT_PRESENT 0x023a00 | |
107 | #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302 | |
108 | #define SS_NOT_READY_TO_READY_TRANSITION 0x062800 | |
109 | #define SS_RESET_OCCURRED 0x062900 | |
110 | #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900 | |
111 | #define SS_UNRECOVERED_READ_ERROR 0x031100 | |
112 | #define SS_WRITE_ERROR 0x030c02 | |
113 | #define SS_WRITE_PROTECTED 0x072700 | |
114 | ||
d26a6aa0 | 115 | #define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */ |
b6058d0f MN |
116 | #define ASC(x) ((u8) ((x) >> 8)) |
117 | #define ASCQ(x) ((u8) (x)) | |
118 | ||
119 | ||
120 | /*-------------------------------------------------------------------------*/ | |
121 | ||
122 | ||
d6181702 | 123 | struct fsg_lun { |
b6058d0f MN |
124 | struct file *filp; |
125 | loff_t file_length; | |
126 | loff_t num_sectors; | |
127 | ||
d26a6aa0 MN |
128 | unsigned int initially_ro:1; |
129 | unsigned int ro:1; | |
130 | unsigned int removable:1; | |
131 | unsigned int cdrom:1; | |
132 | unsigned int prevent_medium_removal:1; | |
133 | unsigned int registered:1; | |
134 | unsigned int info_valid:1; | |
a93917d3 | 135 | unsigned int nofua:1; |
b6058d0f MN |
136 | |
137 | u32 sense_data; | |
138 | u32 sense_data_info; | |
139 | u32 unit_attention_data; | |
140 | ||
3f565a36 PL |
141 | unsigned int blkbits; /* Bits of logical block size of bound block device */ |
142 | unsigned int blksize; /* logical block size of bound block device */ | |
b6058d0f MN |
143 | struct device dev; |
144 | }; | |
145 | ||
fea20dbc MN |
146 | static inline bool fsg_lun_is_open(struct fsg_lun *curlun) |
147 | { | |
148 | return curlun->filp != NULL; | |
149 | } | |
b6058d0f | 150 | |
fea20dbc | 151 | static inline struct fsg_lun *fsg_lun_from_dev(struct device *dev) |
b6058d0f | 152 | { |
d6181702 | 153 | return container_of(dev, struct fsg_lun, dev); |
b6058d0f MN |
154 | } |
155 | ||
156 | ||
157 | /* Big enough to hold our biggest descriptor */ | |
158 | #define EP0_BUFSIZE 256 | |
d26a6aa0 | 159 | #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */ |
b6058d0f | 160 | |
6532c7fd PF |
161 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES |
162 | ||
163 | static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS; | |
164 | module_param_named(num_buffers, fsg_num_buffers, uint, S_IRUGO); | |
165 | MODULE_PARM_DESC(num_buffers, "Number of pipeline buffers"); | |
166 | ||
167 | #else | |
168 | ||
169 | /* | |
170 | * Number of buffers we will use. | |
171 | * 2 is usually enough for good buffering pipeline | |
172 | */ | |
173 | #define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS | |
174 | ||
175 | #endif /* CONFIG_USB_DEBUG */ | |
176 | ||
177 | /* check if fsg_num_buffers is within a valid range */ | |
178 | static inline int fsg_num_buffers_validate(void) | |
179 | { | |
180 | if (fsg_num_buffers >= 2 && fsg_num_buffers <= 4) | |
181 | return 0; | |
182 | pr_err("fsg_num_buffers %u is out of range (%d to %d)\n", | |
183 | fsg_num_buffers, 2 ,4); | |
184 | return -EINVAL; | |
185 | } | |
b6058d0f | 186 | |
93f93740 MN |
187 | /* Default size of buffer length. */ |
188 | #define FSG_BUFLEN ((u32)16384) | |
189 | ||
190 | /* Maximal number of LUNs supported in mass storage function */ | |
191 | #define FSG_MAX_LUNS 8 | |
192 | ||
b6058d0f MN |
193 | enum fsg_buffer_state { |
194 | BUF_STATE_EMPTY = 0, | |
195 | BUF_STATE_FULL, | |
196 | BUF_STATE_BUSY | |
197 | }; | |
198 | ||
199 | struct fsg_buffhd { | |
200 | void *buf; | |
201 | enum fsg_buffer_state state; | |
202 | struct fsg_buffhd *next; | |
203 | ||
98346f7d GKH |
204 | /* |
205 | * The NetChip 2280 is faster, and handles some protocol faults | |
206 | * better, if we don't submit any short bulk-out read requests. | |
207 | * So we will record the intended request length here. | |
208 | */ | |
209 | unsigned int bulk_out_intended_length; | |
210 | ||
b6058d0f MN |
211 | struct usb_request *inreq; |
212 | int inreq_busy; | |
213 | struct usb_request *outreq; | |
214 | int outreq_busy; | |
215 | }; | |
216 | ||
217 | enum fsg_state { | |
d26a6aa0 MN |
218 | /* This one isn't used anywhere */ |
219 | FSG_STATE_COMMAND_PHASE = -10, | |
b6058d0f MN |
220 | FSG_STATE_DATA_PHASE, |
221 | FSG_STATE_STATUS_PHASE, | |
222 | ||
223 | FSG_STATE_IDLE = 0, | |
224 | FSG_STATE_ABORT_BULK_OUT, | |
225 | FSG_STATE_RESET, | |
226 | FSG_STATE_INTERFACE_CHANGE, | |
227 | FSG_STATE_CONFIG_CHANGE, | |
228 | FSG_STATE_DISCONNECT, | |
229 | FSG_STATE_EXIT, | |
230 | FSG_STATE_TERMINATED | |
231 | }; | |
232 | ||
233 | enum data_direction { | |
234 | DATA_DIR_UNKNOWN = 0, | |
235 | DATA_DIR_FROM_HOST, | |
236 | DATA_DIR_TO_HOST, | |
237 | DATA_DIR_NONE | |
238 | }; | |
239 | ||
240 | ||
241 | /*-------------------------------------------------------------------------*/ | |
242 | ||
243 | ||
244 | static inline u32 get_unaligned_be24(u8 *buf) | |
245 | { | |
246 | return 0xffffff & (u32) get_unaligned_be32(buf - 1); | |
247 | } | |
248 | ||
249 | ||
250 | /*-------------------------------------------------------------------------*/ | |
251 | ||
252 | ||
d6181702 | 253 | enum { |
d6181702 MN |
254 | FSG_STRING_INTERFACE |
255 | }; | |
b6058d0f MN |
256 | |
257 | ||
b6058d0f MN |
258 | /* There is only one interface. */ |
259 | ||
260 | static struct usb_interface_descriptor | |
d6181702 MN |
261 | fsg_intf_desc = { |
262 | .bLength = sizeof fsg_intf_desc, | |
b6058d0f MN |
263 | .bDescriptorType = USB_DT_INTERFACE, |
264 | ||
d26a6aa0 | 265 | .bNumEndpoints = 2, /* Adjusted during fsg_bind() */ |
b6058d0f | 266 | .bInterfaceClass = USB_CLASS_MASS_STORAGE, |
d26a6aa0 MN |
267 | .bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */ |
268 | .bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */ | |
d6181702 | 269 | .iInterface = FSG_STRING_INTERFACE, |
b6058d0f MN |
270 | }; |
271 | ||
d0893264 MN |
272 | /* |
273 | * Three full-speed endpoint descriptors: bulk-in, bulk-out, and | |
274 | * interrupt-in. | |
275 | */ | |
b6058d0f MN |
276 | |
277 | static struct usb_endpoint_descriptor | |
d6181702 | 278 | fsg_fs_bulk_in_desc = { |
b6058d0f MN |
279 | .bLength = USB_DT_ENDPOINT_SIZE, |
280 | .bDescriptorType = USB_DT_ENDPOINT, | |
281 | ||
282 | .bEndpointAddress = USB_DIR_IN, | |
283 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
284 | /* wMaxPacketSize set by autoconfiguration */ | |
285 | }; | |
286 | ||
287 | static struct usb_endpoint_descriptor | |
d6181702 | 288 | fsg_fs_bulk_out_desc = { |
b6058d0f MN |
289 | .bLength = USB_DT_ENDPOINT_SIZE, |
290 | .bDescriptorType = USB_DT_ENDPOINT, | |
291 | ||
292 | .bEndpointAddress = USB_DIR_OUT, | |
293 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
294 | /* wMaxPacketSize set by autoconfiguration */ | |
295 | }; | |
296 | ||
d23b0f08 | 297 | static struct usb_descriptor_header *fsg_fs_function[] = { |
d6181702 MN |
298 | (struct usb_descriptor_header *) &fsg_intf_desc, |
299 | (struct usb_descriptor_header *) &fsg_fs_bulk_in_desc, | |
300 | (struct usb_descriptor_header *) &fsg_fs_bulk_out_desc, | |
b6058d0f MN |
301 | NULL, |
302 | }; | |
b6058d0f MN |
303 | |
304 | ||
305 | /* | |
306 | * USB 2.0 devices need to expose both high speed and full speed | |
307 | * descriptors, unless they only run at full speed. | |
308 | * | |
309 | * That means alternate endpoint descriptors (bigger packets) | |
310 | * and a "device qualifier" ... plus more construction options | |
d0893264 | 311 | * for the configuration descriptor. |
b6058d0f MN |
312 | */ |
313 | static struct usb_endpoint_descriptor | |
d6181702 | 314 | fsg_hs_bulk_in_desc = { |
b6058d0f MN |
315 | .bLength = USB_DT_ENDPOINT_SIZE, |
316 | .bDescriptorType = USB_DT_ENDPOINT, | |
317 | ||
318 | /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ | |
319 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
320 | .wMaxPacketSize = cpu_to_le16(512), | |
321 | }; | |
322 | ||
323 | static struct usb_endpoint_descriptor | |
d6181702 | 324 | fsg_hs_bulk_out_desc = { |
b6058d0f MN |
325 | .bLength = USB_DT_ENDPOINT_SIZE, |
326 | .bDescriptorType = USB_DT_ENDPOINT, | |
327 | ||
328 | /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ | |
329 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
330 | .wMaxPacketSize = cpu_to_le16(512), | |
d26a6aa0 | 331 | .bInterval = 1, /* NAK every 1 uframe */ |
b6058d0f MN |
332 | }; |
333 | ||
93bcf12e | 334 | |
d23b0f08 | 335 | static struct usb_descriptor_header *fsg_hs_function[] = { |
d6181702 MN |
336 | (struct usb_descriptor_header *) &fsg_intf_desc, |
337 | (struct usb_descriptor_header *) &fsg_hs_bulk_in_desc, | |
338 | (struct usb_descriptor_header *) &fsg_hs_bulk_out_desc, | |
b6058d0f MN |
339 | NULL, |
340 | }; | |
b6058d0f | 341 | |
4bb99b7c FB |
342 | static struct usb_endpoint_descriptor |
343 | fsg_ss_bulk_in_desc = { | |
344 | .bLength = USB_DT_ENDPOINT_SIZE, | |
345 | .bDescriptorType = USB_DT_ENDPOINT, | |
346 | ||
347 | /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ | |
348 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
349 | .wMaxPacketSize = cpu_to_le16(1024), | |
350 | }; | |
351 | ||
352 | static struct usb_ss_ep_comp_descriptor fsg_ss_bulk_in_comp_desc = { | |
353 | .bLength = sizeof(fsg_ss_bulk_in_comp_desc), | |
354 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
355 | ||
356 | /*.bMaxBurst = DYNAMIC, */ | |
357 | }; | |
358 | ||
359 | static struct usb_endpoint_descriptor | |
360 | fsg_ss_bulk_out_desc = { | |
361 | .bLength = USB_DT_ENDPOINT_SIZE, | |
362 | .bDescriptorType = USB_DT_ENDPOINT, | |
363 | ||
364 | /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ | |
365 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
366 | .wMaxPacketSize = cpu_to_le16(1024), | |
367 | }; | |
368 | ||
369 | static struct usb_ss_ep_comp_descriptor fsg_ss_bulk_out_comp_desc = { | |
370 | .bLength = sizeof(fsg_ss_bulk_in_comp_desc), | |
371 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
372 | ||
373 | /*.bMaxBurst = DYNAMIC, */ | |
374 | }; | |
375 | ||
4bb99b7c | 376 | static struct usb_descriptor_header *fsg_ss_function[] = { |
4bb99b7c FB |
377 | (struct usb_descriptor_header *) &fsg_intf_desc, |
378 | (struct usb_descriptor_header *) &fsg_ss_bulk_in_desc, | |
379 | (struct usb_descriptor_header *) &fsg_ss_bulk_in_comp_desc, | |
380 | (struct usb_descriptor_header *) &fsg_ss_bulk_out_desc, | |
381 | (struct usb_descriptor_header *) &fsg_ss_bulk_out_comp_desc, | |
4bb99b7c FB |
382 | NULL, |
383 | }; | |
384 | ||
b6058d0f | 385 | /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ |
d6181702 | 386 | static struct usb_string fsg_strings[] = { |
d6181702 | 387 | {FSG_STRING_INTERFACE, fsg_string_interface}, |
b6058d0f MN |
388 | {} |
389 | }; | |
390 | ||
d6181702 | 391 | static struct usb_gadget_strings fsg_stringtab = { |
d26a6aa0 | 392 | .language = 0x0409, /* en-us */ |
d6181702 | 393 | .strings = fsg_strings, |
b6058d0f MN |
394 | }; |
395 | ||
396 | ||
397 | /*-------------------------------------------------------------------------*/ | |
398 | ||
d0893264 MN |
399 | /* |
400 | * If the next two routines are called while the gadget is registered, | |
401 | * the caller must own fsg->filesem for writing. | |
402 | */ | |
b6058d0f | 403 | |
d6e16a89 MN |
404 | static void fsg_lun_close(struct fsg_lun *curlun) |
405 | { | |
406 | if (curlun->filp) { | |
407 | LDBG(curlun, "close backing file\n"); | |
408 | fput(curlun->filp); | |
409 | curlun->filp = NULL; | |
410 | } | |
411 | } | |
412 | ||
413 | ||
d6181702 | 414 | static int fsg_lun_open(struct fsg_lun *curlun, const char *filename) |
b6058d0f MN |
415 | { |
416 | int ro; | |
417 | struct file *filp = NULL; | |
418 | int rc = -EINVAL; | |
419 | struct inode *inode = NULL; | |
420 | loff_t size; | |
421 | loff_t num_sectors; | |
422 | loff_t min_sectors; | |
d6e16a89 MN |
423 | unsigned int blkbits; |
424 | unsigned int blksize; | |
b6058d0f MN |
425 | |
426 | /* R/W if we can, R/O if we must */ | |
e909ef5d | 427 | ro = curlun->initially_ro; |
b6058d0f MN |
428 | if (!ro) { |
429 | filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0); | |
75f1dc0d | 430 | if (PTR_ERR(filp) == -EROFS || PTR_ERR(filp) == -EACCES) |
b6058d0f MN |
431 | ro = 1; |
432 | } | |
433 | if (ro) | |
434 | filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0); | |
435 | if (IS_ERR(filp)) { | |
436 | LINFO(curlun, "unable to open backing file: %s\n", filename); | |
437 | return PTR_ERR(filp); | |
438 | } | |
439 | ||
440 | if (!(filp->f_mode & FMODE_WRITE)) | |
441 | ro = 1; | |
442 | ||
20818a0c AV |
443 | inode = filp->f_path.dentry->d_inode; |
444 | if ((!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) { | |
b6058d0f MN |
445 | LINFO(curlun, "invalid file type: %s\n", filename); |
446 | goto out; | |
447 | } | |
448 | ||
d0893264 MN |
449 | /* |
450 | * If we can't read the file, it's no good. | |
451 | * If we can't write the file, use it read-only. | |
452 | */ | |
20818a0c | 453 | if (!(filp->f_op->read || filp->f_op->aio_read)) { |
b6058d0f MN |
454 | LINFO(curlun, "file not readable: %s\n", filename); |
455 | goto out; | |
456 | } | |
457 | if (!(filp->f_op->write || filp->f_op->aio_write)) | |
458 | ro = 1; | |
459 | ||
460 | size = i_size_read(inode->i_mapping->host); | |
461 | if (size < 0) { | |
462 | LINFO(curlun, "unable to find file size: %s\n", filename); | |
463 | rc = (int) size; | |
464 | goto out; | |
465 | } | |
3f565a36 PL |
466 | |
467 | if (curlun->cdrom) { | |
d6e16a89 MN |
468 | blksize = 2048; |
469 | blkbits = 11; | |
3f565a36 | 470 | } else if (inode->i_bdev) { |
d6e16a89 MN |
471 | blksize = bdev_logical_block_size(inode->i_bdev); |
472 | blkbits = blksize_bits(blksize); | |
3f565a36 | 473 | } else { |
d6e16a89 MN |
474 | blksize = 512; |
475 | blkbits = 9; | |
3f565a36 PL |
476 | } |
477 | ||
d6e16a89 | 478 | num_sectors = size >> blkbits; /* File size in logic-block-size blocks */ |
b6058d0f | 479 | min_sectors = 1; |
e909ef5d | 480 | if (curlun->cdrom) { |
3f565a36 PL |
481 | min_sectors = 300; /* Smallest track is 300 frames */ |
482 | if (num_sectors >= 256*60*75) { | |
483 | num_sectors = 256*60*75 - 1; | |
b6058d0f MN |
484 | LINFO(curlun, "file too big: %s\n", filename); |
485 | LINFO(curlun, "using only first %d blocks\n", | |
486 | (int) num_sectors); | |
487 | } | |
488 | } | |
489 | if (num_sectors < min_sectors) { | |
490 | LINFO(curlun, "file too small: %s\n", filename); | |
491 | rc = -ETOOSMALL; | |
492 | goto out; | |
493 | } | |
494 | ||
d6e16a89 MN |
495 | if (fsg_lun_is_open(curlun)) |
496 | fsg_lun_close(curlun); | |
497 | ||
d6e16a89 MN |
498 | curlun->blksize = blksize; |
499 | curlun->blkbits = blkbits; | |
b6058d0f MN |
500 | curlun->ro = ro; |
501 | curlun->filp = filp; | |
502 | curlun->file_length = size; | |
503 | curlun->num_sectors = num_sectors; | |
504 | LDBG(curlun, "open backing file: %s\n", filename); | |
20818a0c | 505 | return 0; |
b6058d0f MN |
506 | |
507 | out: | |
20818a0c | 508 | fput(filp); |
b6058d0f MN |
509 | return rc; |
510 | } | |
511 | ||
512 | ||
b6058d0f MN |
513 | /*-------------------------------------------------------------------------*/ |
514 | ||
d0893264 MN |
515 | /* |
516 | * Sync the file data, don't bother with the metadata. | |
517 | * This code was copied from fs/buffer.c:sys_fdatasync(). | |
518 | */ | |
d6181702 | 519 | static int fsg_lun_fsync_sub(struct fsg_lun *curlun) |
b6058d0f MN |
520 | { |
521 | struct file *filp = curlun->filp; | |
522 | ||
523 | if (curlun->ro || !filp) | |
524 | return 0; | |
8018ab05 | 525 | return vfs_fsync(filp, 1); |
b6058d0f MN |
526 | } |
527 | ||
528 | static void store_cdrom_address(u8 *dest, int msf, u32 addr) | |
529 | { | |
530 | if (msf) { | |
531 | /* Convert to Minutes-Seconds-Frames */ | |
532 | addr >>= 2; /* Convert to 2048-byte frames */ | |
533 | addr += 2*75; /* Lead-in occupies 2 seconds */ | |
534 | dest[3] = addr % 75; /* Frames */ | |
535 | addr /= 75; | |
536 | dest[2] = addr % 60; /* Seconds */ | |
537 | addr /= 60; | |
538 | dest[1] = addr; /* Minutes */ | |
539 | dest[0] = 0; /* Reserved */ | |
540 | } else { | |
541 | /* Absolute sector */ | |
542 | put_unaligned_be32(addr, dest); | |
543 | } | |
544 | } | |
93f93740 MN |
545 | |
546 | ||
547 | /*-------------------------------------------------------------------------*/ | |
548 | ||
549 | ||
550 | static ssize_t fsg_show_ro(struct device *dev, struct device_attribute *attr, | |
551 | char *buf) | |
552 | { | |
553 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); | |
554 | ||
555 | return sprintf(buf, "%d\n", fsg_lun_is_open(curlun) | |
556 | ? curlun->ro | |
557 | : curlun->initially_ro); | |
558 | } | |
559 | ||
a93917d3 AS |
560 | static ssize_t fsg_show_nofua(struct device *dev, struct device_attribute *attr, |
561 | char *buf) | |
562 | { | |
563 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); | |
564 | ||
565 | return sprintf(buf, "%u\n", curlun->nofua); | |
566 | } | |
567 | ||
93f93740 MN |
568 | static ssize_t fsg_show_file(struct device *dev, struct device_attribute *attr, |
569 | char *buf) | |
570 | { | |
571 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); | |
572 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
573 | char *p; | |
574 | ssize_t rc; | |
575 | ||
576 | down_read(filesem); | |
d26a6aa0 | 577 | if (fsg_lun_is_open(curlun)) { /* Get the complete pathname */ |
93f93740 MN |
578 | p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1); |
579 | if (IS_ERR(p)) | |
580 | rc = PTR_ERR(p); | |
581 | else { | |
582 | rc = strlen(p); | |
583 | memmove(buf, p, rc); | |
d26a6aa0 | 584 | buf[rc] = '\n'; /* Add a newline */ |
93f93740 MN |
585 | buf[++rc] = 0; |
586 | } | |
d26a6aa0 | 587 | } else { /* No file, return 0 bytes */ |
93f93740 MN |
588 | *buf = 0; |
589 | rc = 0; | |
590 | } | |
591 | up_read(filesem); | |
592 | return rc; | |
593 | } | |
594 | ||
595 | ||
596 | static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr, | |
597 | const char *buf, size_t count) | |
598 | { | |
fd4477b0 | 599 | ssize_t rc; |
93f93740 MN |
600 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
601 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
db8fa285 | 602 | unsigned ro; |
93f93740 | 603 | |
db8fa285 MN |
604 | rc = kstrtouint(buf, 2, &ro); |
605 | if (rc) | |
606 | return rc; | |
93f93740 | 607 | |
d0893264 MN |
608 | /* |
609 | * Allow the write-enable status to change only while the | |
610 | * backing file is closed. | |
611 | */ | |
93f93740 MN |
612 | down_read(filesem); |
613 | if (fsg_lun_is_open(curlun)) { | |
614 | LDBG(curlun, "read-only status change prevented\n"); | |
615 | rc = -EBUSY; | |
616 | } else { | |
8156d158 AS |
617 | curlun->ro = ro; |
618 | curlun->initially_ro = ro; | |
93f93740 | 619 | LDBG(curlun, "read-only status set to %d\n", curlun->ro); |
fd4477b0 | 620 | rc = count; |
93f93740 MN |
621 | } |
622 | up_read(filesem); | |
623 | return rc; | |
624 | } | |
625 | ||
a93917d3 AS |
626 | static ssize_t fsg_store_nofua(struct device *dev, |
627 | struct device_attribute *attr, | |
628 | const char *buf, size_t count) | |
629 | { | |
630 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); | |
db8fa285 MN |
631 | unsigned nofua; |
632 | int ret; | |
a93917d3 | 633 | |
db8fa285 MN |
634 | ret = kstrtouint(buf, 2, &nofua); |
635 | if (ret) | |
636 | return ret; | |
a93917d3 AS |
637 | |
638 | /* Sync data when switching from async mode to sync */ | |
639 | if (!nofua && curlun->nofua) | |
640 | fsg_lun_fsync_sub(curlun); | |
641 | ||
642 | curlun->nofua = nofua; | |
643 | ||
644 | return count; | |
645 | } | |
646 | ||
93f93740 MN |
647 | static ssize_t fsg_store_file(struct device *dev, struct device_attribute *attr, |
648 | const char *buf, size_t count) | |
649 | { | |
650 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); | |
651 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
652 | int rc = 0; | |
653 | ||
654 | if (curlun->prevent_medium_removal && fsg_lun_is_open(curlun)) { | |
655 | LDBG(curlun, "eject attempt prevented\n"); | |
d26a6aa0 | 656 | return -EBUSY; /* "Door is locked" */ |
93f93740 MN |
657 | } |
658 | ||
659 | /* Remove a trailing newline */ | |
660 | if (count > 0 && buf[count-1] == '\n') | |
d26a6aa0 | 661 | ((char *) buf)[count-1] = 0; /* Ugh! */ |
93f93740 | 662 | |
93f93740 | 663 | /* Load new medium */ |
d6e16a89 | 664 | down_write(filesem); |
93f93740 | 665 | if (count > 0 && buf[0]) { |
d6e16a89 | 666 | /* fsg_lun_open() will close existing file if any. */ |
93f93740 MN |
667 | rc = fsg_lun_open(curlun, buf); |
668 | if (rc == 0) | |
669 | curlun->unit_attention_data = | |
670 | SS_NOT_READY_TO_READY_TRANSITION; | |
d6e16a89 MN |
671 | } else if (fsg_lun_is_open(curlun)) { |
672 | fsg_lun_close(curlun); | |
673 | curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT; | |
93f93740 MN |
674 | } |
675 | up_write(filesem); | |
676 | return (rc < 0 ? rc : count); | |
677 | } |