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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 | |
6 | * Author: Michal Nazarewicz (m.nazarewicz@samsung.com) | |
7 | */ | |
8 | ||
9 | ||
10 | ||
11 | /*-------------------------------------------------------------------------*/ | |
12 | ||
13 | ||
14 | #ifndef DEBUG | |
15 | #undef VERBOSE_DEBUG | |
16 | #undef DUMP_MSGS | |
17 | #endif /* !DEBUG */ | |
18 | ||
19 | #ifdef VERBOSE_DEBUG | |
20 | #define VLDBG LDBG | |
21 | #else | |
22 | #define VLDBG(lun, fmt, args...) do { } while (0) | |
23 | #endif /* VERBOSE_DEBUG */ | |
24 | ||
25 | #define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args) | |
26 | #define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args) | |
27 | #define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args) | |
28 | #define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args) | |
29 | ||
30 | #define DBG(d, fmt, args...) dev_dbg (&(d)->gadget->dev, fmt, ## args) | |
31 | #define VDBG(d, fmt, args...) dev_vdbg(&(d)->gadget->dev, fmt, ## args) | |
32 | #define ERROR(d, fmt, args...) dev_err (&(d)->gadget->dev, fmt, ## args) | |
33 | #define WARNING(d, fmt, args...) dev_warn(&(d)->gadget->dev, fmt, ## args) | |
34 | #define INFO(d, fmt, args...) dev_info(&(d)->gadget->dev, fmt, ## args) | |
35 | ||
36 | ||
37 | ||
38 | #ifdef DUMP_MSGS | |
39 | ||
40 | # define dump_msg(fsg, /* const char * */ label, \ | |
41 | /* const u8 * */ buf, /* unsigned */ length) do { \ | |
42 | if (length < 512) { \ | |
43 | DBG(fsg, "%s, length %u:\n", label, length); \ | |
44 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \ | |
45 | 16, 1, buf, length, 0); \ | |
46 | } \ | |
47 | } while (0) | |
48 | ||
49 | # define dump_cdb(fsg) do { } while (0) | |
50 | ||
51 | #else | |
52 | ||
53 | # define dump_msg(fsg, /* const char * */ label, \ | |
54 | /* const u8 * */ buf, /* unsigned */ length) do { } while (0) | |
55 | ||
56 | # ifdef VERBOSE_DEBUG | |
57 | ||
58 | #define dump_cdb(fsg) \ | |
59 | print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \ | |
60 | 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \ | |
61 | ||
62 | # else | |
63 | ||
64 | # define dump_cdb(fsg) do { } while (0) | |
65 | ||
66 | # endif /* VERBOSE_DEBUG */ | |
67 | ||
68 | #endif /* DUMP_MSGS */ | |
69 | ||
70 | ||
71 | ||
72 | ||
73 | ||
74 | /*-------------------------------------------------------------------------*/ | |
75 | ||
76 | /* SCSI device types */ | |
77 | #define TYPE_DISK 0x00 | |
78 | #define TYPE_CDROM 0x05 | |
79 | ||
80 | /* USB protocol value = the transport method */ | |
81 | #define USB_PR_CBI 0x00 // Control/Bulk/Interrupt | |
82 | #define USB_PR_CB 0x01 // Control/Bulk w/o interrupt | |
83 | #define USB_PR_BULK 0x50 // Bulk-only | |
84 | ||
85 | /* USB subclass value = the protocol encapsulation */ | |
86 | #define USB_SC_RBC 0x01 // Reduced Block Commands (flash) | |
87 | #define USB_SC_8020 0x02 // SFF-8020i, MMC-2, ATAPI (CD-ROM) | |
88 | #define USB_SC_QIC 0x03 // QIC-157 (tape) | |
89 | #define USB_SC_UFI 0x04 // UFI (floppy) | |
90 | #define USB_SC_8070 0x05 // SFF-8070i (removable) | |
91 | #define USB_SC_SCSI 0x06 // Transparent SCSI | |
92 | ||
93 | /* Bulk-only data structures */ | |
94 | ||
95 | /* Command Block Wrapper */ | |
96 | struct bulk_cb_wrap { | |
97 | __le32 Signature; // Contains 'USBC' | |
98 | u32 Tag; // Unique per command id | |
99 | __le32 DataTransferLength; // Size of the data | |
100 | u8 Flags; // Direction in bit 7 | |
101 | u8 Lun; // LUN (normally 0) | |
102 | u8 Length; // Of the CDB, <= MAX_COMMAND_SIZE | |
103 | u8 CDB[16]; // Command Data Block | |
104 | }; | |
105 | ||
106 | #define USB_BULK_CB_WRAP_LEN 31 | |
107 | #define USB_BULK_CB_SIG 0x43425355 // Spells out USBC | |
108 | #define USB_BULK_IN_FLAG 0x80 | |
109 | ||
110 | /* Command Status Wrapper */ | |
111 | struct bulk_cs_wrap { | |
112 | __le32 Signature; // Should = 'USBS' | |
113 | u32 Tag; // Same as original command | |
114 | __le32 Residue; // Amount not transferred | |
115 | u8 Status; // See below | |
116 | }; | |
117 | ||
118 | #define USB_BULK_CS_WRAP_LEN 13 | |
119 | #define USB_BULK_CS_SIG 0x53425355 // Spells out 'USBS' | |
120 | #define USB_STATUS_PASS 0 | |
121 | #define USB_STATUS_FAIL 1 | |
122 | #define USB_STATUS_PHASE_ERROR 2 | |
123 | ||
124 | /* Bulk-only class specific requests */ | |
125 | #define USB_BULK_RESET_REQUEST 0xff | |
126 | #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe | |
127 | ||
128 | ||
129 | /* CBI Interrupt data structure */ | |
130 | struct interrupt_data { | |
131 | u8 bType; | |
132 | u8 bValue; | |
133 | }; | |
134 | ||
135 | #define CBI_INTERRUPT_DATA_LEN 2 | |
136 | ||
137 | /* CBI Accept Device-Specific Command request */ | |
138 | #define USB_CBI_ADSC_REQUEST 0x00 | |
139 | ||
140 | ||
141 | #define MAX_COMMAND_SIZE 16 // Length of a SCSI Command Data Block | |
142 | ||
143 | /* SCSI commands that we recognize */ | |
144 | #define SC_FORMAT_UNIT 0x04 | |
145 | #define SC_INQUIRY 0x12 | |
146 | #define SC_MODE_SELECT_6 0x15 | |
147 | #define SC_MODE_SELECT_10 0x55 | |
148 | #define SC_MODE_SENSE_6 0x1a | |
149 | #define SC_MODE_SENSE_10 0x5a | |
150 | #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e | |
151 | #define SC_READ_6 0x08 | |
152 | #define SC_READ_10 0x28 | |
153 | #define SC_READ_12 0xa8 | |
154 | #define SC_READ_CAPACITY 0x25 | |
155 | #define SC_READ_FORMAT_CAPACITIES 0x23 | |
156 | #define SC_READ_HEADER 0x44 | |
157 | #define SC_READ_TOC 0x43 | |
158 | #define SC_RELEASE 0x17 | |
159 | #define SC_REQUEST_SENSE 0x03 | |
160 | #define SC_RESERVE 0x16 | |
161 | #define SC_SEND_DIAGNOSTIC 0x1d | |
162 | #define SC_START_STOP_UNIT 0x1b | |
163 | #define SC_SYNCHRONIZE_CACHE 0x35 | |
164 | #define SC_TEST_UNIT_READY 0x00 | |
165 | #define SC_VERIFY 0x2f | |
166 | #define SC_WRITE_6 0x0a | |
167 | #define SC_WRITE_10 0x2a | |
168 | #define SC_WRITE_12 0xaa | |
169 | ||
170 | /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */ | |
171 | #define SS_NO_SENSE 0 | |
172 | #define SS_COMMUNICATION_FAILURE 0x040800 | |
173 | #define SS_INVALID_COMMAND 0x052000 | |
174 | #define SS_INVALID_FIELD_IN_CDB 0x052400 | |
175 | #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100 | |
176 | #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500 | |
177 | #define SS_MEDIUM_NOT_PRESENT 0x023a00 | |
178 | #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302 | |
179 | #define SS_NOT_READY_TO_READY_TRANSITION 0x062800 | |
180 | #define SS_RESET_OCCURRED 0x062900 | |
181 | #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900 | |
182 | #define SS_UNRECOVERED_READ_ERROR 0x031100 | |
183 | #define SS_WRITE_ERROR 0x030c02 | |
184 | #define SS_WRITE_PROTECTED 0x072700 | |
185 | ||
186 | #define SK(x) ((u8) ((x) >> 16)) // Sense Key byte, etc. | |
187 | #define ASC(x) ((u8) ((x) >> 8)) | |
188 | #define ASCQ(x) ((u8) (x)) | |
189 | ||
190 | ||
191 | /*-------------------------------------------------------------------------*/ | |
192 | ||
193 | ||
194 | struct lun { | |
195 | struct file *filp; | |
196 | loff_t file_length; | |
197 | loff_t num_sectors; | |
198 | ||
199 | unsigned int ro : 1; | |
200 | unsigned int prevent_medium_removal : 1; | |
201 | unsigned int registered : 1; | |
202 | unsigned int info_valid : 1; | |
203 | ||
204 | u32 sense_data; | |
205 | u32 sense_data_info; | |
206 | u32 unit_attention_data; | |
207 | ||
208 | struct device dev; | |
209 | }; | |
210 | ||
211 | #define backing_file_is_open(curlun) ((curlun)->filp != NULL) | |
212 | ||
213 | static struct lun *dev_to_lun(struct device *dev) | |
214 | { | |
215 | return container_of(dev, struct lun, dev); | |
216 | } | |
217 | ||
218 | ||
219 | /* Big enough to hold our biggest descriptor */ | |
220 | #define EP0_BUFSIZE 256 | |
221 | #define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value | |
222 | ||
223 | /* Number of buffers we will use. 2 is enough for double-buffering */ | |
224 | #define NUM_BUFFERS 2 | |
225 | ||
226 | enum fsg_buffer_state { | |
227 | BUF_STATE_EMPTY = 0, | |
228 | BUF_STATE_FULL, | |
229 | BUF_STATE_BUSY | |
230 | }; | |
231 | ||
232 | struct fsg_buffhd { | |
233 | void *buf; | |
234 | enum fsg_buffer_state state; | |
235 | struct fsg_buffhd *next; | |
236 | ||
237 | /* The NetChip 2280 is faster, and handles some protocol faults | |
238 | * better, if we don't submit any short bulk-out read requests. | |
239 | * So we will record the intended request length here. */ | |
240 | unsigned int bulk_out_intended_length; | |
241 | ||
242 | struct usb_request *inreq; | |
243 | int inreq_busy; | |
244 | struct usb_request *outreq; | |
245 | int outreq_busy; | |
246 | }; | |
247 | ||
248 | enum fsg_state { | |
249 | FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere | |
250 | FSG_STATE_DATA_PHASE, | |
251 | FSG_STATE_STATUS_PHASE, | |
252 | ||
253 | FSG_STATE_IDLE = 0, | |
254 | FSG_STATE_ABORT_BULK_OUT, | |
255 | FSG_STATE_RESET, | |
256 | FSG_STATE_INTERFACE_CHANGE, | |
257 | FSG_STATE_CONFIG_CHANGE, | |
258 | FSG_STATE_DISCONNECT, | |
259 | FSG_STATE_EXIT, | |
260 | FSG_STATE_TERMINATED | |
261 | }; | |
262 | ||
263 | enum data_direction { | |
264 | DATA_DIR_UNKNOWN = 0, | |
265 | DATA_DIR_FROM_HOST, | |
266 | DATA_DIR_TO_HOST, | |
267 | DATA_DIR_NONE | |
268 | }; | |
269 | ||
270 | ||
271 | /*-------------------------------------------------------------------------*/ | |
272 | ||
273 | ||
274 | static inline u32 get_unaligned_be24(u8 *buf) | |
275 | { | |
276 | return 0xffffff & (u32) get_unaligned_be32(buf - 1); | |
277 | } | |
278 | ||
279 | ||
280 | /*-------------------------------------------------------------------------*/ | |
281 | ||
282 | ||
283 | #define STRING_MANUFACTURER 1 | |
284 | #define STRING_PRODUCT 2 | |
285 | #define STRING_SERIAL 3 | |
286 | #define STRING_CONFIG 4 | |
287 | #define STRING_INTERFACE 5 | |
288 | ||
289 | ||
290 | static struct usb_otg_descriptor | |
291 | otg_desc = { | |
292 | .bLength = sizeof(otg_desc), | |
293 | .bDescriptorType = USB_DT_OTG, | |
294 | ||
295 | .bmAttributes = USB_OTG_SRP, | |
296 | }; | |
297 | ||
298 | /* There is only one interface. */ | |
299 | ||
300 | static struct usb_interface_descriptor | |
301 | intf_desc = { | |
302 | .bLength = sizeof intf_desc, | |
303 | .bDescriptorType = USB_DT_INTERFACE, | |
304 | ||
305 | .bNumEndpoints = 2, // Adjusted during fsg_bind() | |
306 | .bInterfaceClass = USB_CLASS_MASS_STORAGE, | |
307 | .bInterfaceSubClass = USB_SC_SCSI, // Adjusted during fsg_bind() | |
308 | .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind() | |
309 | .iInterface = STRING_INTERFACE, | |
310 | }; | |
311 | ||
312 | /* Three full-speed endpoint descriptors: bulk-in, bulk-out, | |
313 | * and interrupt-in. */ | |
314 | ||
315 | static struct usb_endpoint_descriptor | |
316 | fs_bulk_in_desc = { | |
317 | .bLength = USB_DT_ENDPOINT_SIZE, | |
318 | .bDescriptorType = USB_DT_ENDPOINT, | |
319 | ||
320 | .bEndpointAddress = USB_DIR_IN, | |
321 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
322 | /* wMaxPacketSize set by autoconfiguration */ | |
323 | }; | |
324 | ||
325 | static struct usb_endpoint_descriptor | |
326 | fs_bulk_out_desc = { | |
327 | .bLength = USB_DT_ENDPOINT_SIZE, | |
328 | .bDescriptorType = USB_DT_ENDPOINT, | |
329 | ||
330 | .bEndpointAddress = USB_DIR_OUT, | |
331 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
332 | /* wMaxPacketSize set by autoconfiguration */ | |
333 | }; | |
334 | ||
335 | static struct usb_endpoint_descriptor | |
336 | fs_intr_in_desc = { | |
337 | .bLength = USB_DT_ENDPOINT_SIZE, | |
338 | .bDescriptorType = USB_DT_ENDPOINT, | |
339 | ||
340 | .bEndpointAddress = USB_DIR_IN, | |
341 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
342 | .wMaxPacketSize = cpu_to_le16(2), | |
343 | .bInterval = 32, // frames -> 32 ms | |
344 | }; | |
345 | ||
346 | static const struct usb_descriptor_header *fs_function[] = { | |
347 | (struct usb_descriptor_header *) &otg_desc, | |
348 | (struct usb_descriptor_header *) &intf_desc, | |
349 | (struct usb_descriptor_header *) &fs_bulk_in_desc, | |
350 | (struct usb_descriptor_header *) &fs_bulk_out_desc, | |
351 | (struct usb_descriptor_header *) &fs_intr_in_desc, | |
352 | NULL, | |
353 | }; | |
354 | #define FS_FUNCTION_PRE_EP_ENTRIES 2 | |
355 | ||
356 | ||
357 | /* | |
358 | * USB 2.0 devices need to expose both high speed and full speed | |
359 | * descriptors, unless they only run at full speed. | |
360 | * | |
361 | * That means alternate endpoint descriptors (bigger packets) | |
362 | * and a "device qualifier" ... plus more construction options | |
363 | * for the config descriptor. | |
364 | */ | |
365 | static struct usb_endpoint_descriptor | |
366 | hs_bulk_in_desc = { | |
367 | .bLength = USB_DT_ENDPOINT_SIZE, | |
368 | .bDescriptorType = USB_DT_ENDPOINT, | |
369 | ||
370 | /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ | |
371 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
372 | .wMaxPacketSize = cpu_to_le16(512), | |
373 | }; | |
374 | ||
375 | static struct usb_endpoint_descriptor | |
376 | hs_bulk_out_desc = { | |
377 | .bLength = USB_DT_ENDPOINT_SIZE, | |
378 | .bDescriptorType = USB_DT_ENDPOINT, | |
379 | ||
380 | /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ | |
381 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
382 | .wMaxPacketSize = cpu_to_le16(512), | |
383 | .bInterval = 1, // NAK every 1 uframe | |
384 | }; | |
385 | ||
386 | static struct usb_endpoint_descriptor | |
387 | hs_intr_in_desc = { | |
388 | .bLength = USB_DT_ENDPOINT_SIZE, | |
389 | .bDescriptorType = USB_DT_ENDPOINT, | |
390 | ||
391 | /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */ | |
392 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
393 | .wMaxPacketSize = cpu_to_le16(2), | |
394 | .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms | |
395 | }; | |
396 | ||
397 | static const struct usb_descriptor_header *hs_function[] = { | |
398 | (struct usb_descriptor_header *) &otg_desc, | |
399 | (struct usb_descriptor_header *) &intf_desc, | |
400 | (struct usb_descriptor_header *) &hs_bulk_in_desc, | |
401 | (struct usb_descriptor_header *) &hs_bulk_out_desc, | |
402 | (struct usb_descriptor_header *) &hs_intr_in_desc, | |
403 | NULL, | |
404 | }; | |
405 | #define HS_FUNCTION_PRE_EP_ENTRIES 2 | |
406 | ||
407 | /* Maxpacket and other transfer characteristics vary by speed. */ | |
408 | static struct usb_endpoint_descriptor * | |
409 | ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs, | |
410 | struct usb_endpoint_descriptor *hs) | |
411 | { | |
412 | if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) | |
413 | return hs; | |
414 | return fs; | |
415 | } | |
416 | ||
417 | ||
418 | /* The CBI specification limits the serial string to 12 uppercase hexadecimal | |
419 | * characters. */ | |
420 | static char manufacturer[64]; | |
421 | static char serial[13]; | |
422 | ||
423 | /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ | |
424 | static struct usb_string strings[] = { | |
425 | {STRING_MANUFACTURER, manufacturer}, | |
426 | {STRING_PRODUCT, longname}, | |
427 | {STRING_SERIAL, serial}, | |
428 | {STRING_CONFIG, "Self-powered"}, | |
429 | {STRING_INTERFACE, "Mass Storage"}, | |
430 | {} | |
431 | }; | |
432 | ||
433 | static struct usb_gadget_strings stringtab = { | |
434 | .language = 0x0409, // en-us | |
435 | .strings = strings, | |
436 | }; | |
437 | ||
438 | ||
439 | /*-------------------------------------------------------------------------*/ | |
440 | ||
441 | /* If the next two routines are called while the gadget is registered, | |
442 | * the caller must own fsg->filesem for writing. */ | |
443 | ||
444 | static int open_backing_file(struct lun *curlun, const char *filename) | |
445 | { | |
446 | int ro; | |
447 | struct file *filp = NULL; | |
448 | int rc = -EINVAL; | |
449 | struct inode *inode = NULL; | |
450 | loff_t size; | |
451 | loff_t num_sectors; | |
452 | loff_t min_sectors; | |
453 | ||
454 | /* R/W if we can, R/O if we must */ | |
455 | ro = curlun->ro; | |
456 | if (!ro) { | |
457 | filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0); | |
458 | if (-EROFS == PTR_ERR(filp)) | |
459 | ro = 1; | |
460 | } | |
461 | if (ro) | |
462 | filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0); | |
463 | if (IS_ERR(filp)) { | |
464 | LINFO(curlun, "unable to open backing file: %s\n", filename); | |
465 | return PTR_ERR(filp); | |
466 | } | |
467 | ||
468 | if (!(filp->f_mode & FMODE_WRITE)) | |
469 | ro = 1; | |
470 | ||
471 | if (filp->f_path.dentry) | |
472 | inode = filp->f_path.dentry->d_inode; | |
473 | if (inode && S_ISBLK(inode->i_mode)) { | |
474 | if (bdev_read_only(inode->i_bdev)) | |
475 | ro = 1; | |
476 | } else if (!inode || !S_ISREG(inode->i_mode)) { | |
477 | LINFO(curlun, "invalid file type: %s\n", filename); | |
478 | goto out; | |
479 | } | |
480 | ||
481 | /* If we can't read the file, it's no good. | |
482 | * If we can't write the file, use it read-only. */ | |
483 | if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) { | |
484 | LINFO(curlun, "file not readable: %s\n", filename); | |
485 | goto out; | |
486 | } | |
487 | if (!(filp->f_op->write || filp->f_op->aio_write)) | |
488 | ro = 1; | |
489 | ||
490 | size = i_size_read(inode->i_mapping->host); | |
491 | if (size < 0) { | |
492 | LINFO(curlun, "unable to find file size: %s\n", filename); | |
493 | rc = (int) size; | |
494 | goto out; | |
495 | } | |
496 | num_sectors = size >> 9; // File size in 512-byte blocks | |
497 | min_sectors = 1; | |
498 | if (mod_data.cdrom) { | |
499 | num_sectors &= ~3; // Reduce to a multiple of 2048 | |
500 | min_sectors = 300*4; // Smallest track is 300 frames | |
501 | if (num_sectors >= 256*60*75*4) { | |
502 | num_sectors = (256*60*75 - 1) * 4; | |
503 | LINFO(curlun, "file too big: %s\n", filename); | |
504 | LINFO(curlun, "using only first %d blocks\n", | |
505 | (int) num_sectors); | |
506 | } | |
507 | } | |
508 | if (num_sectors < min_sectors) { | |
509 | LINFO(curlun, "file too small: %s\n", filename); | |
510 | rc = -ETOOSMALL; | |
511 | goto out; | |
512 | } | |
513 | ||
514 | get_file(filp); | |
515 | curlun->ro = ro; | |
516 | curlun->filp = filp; | |
517 | curlun->file_length = size; | |
518 | curlun->num_sectors = num_sectors; | |
519 | LDBG(curlun, "open backing file: %s\n", filename); | |
520 | rc = 0; | |
521 | ||
522 | out: | |
523 | filp_close(filp, current->files); | |
524 | return rc; | |
525 | } | |
526 | ||
527 | ||
528 | static void close_backing_file(struct lun *curlun) | |
529 | { | |
530 | if (curlun->filp) { | |
531 | LDBG(curlun, "close backing file\n"); | |
532 | fput(curlun->filp); | |
533 | curlun->filp = NULL; | |
534 | } | |
535 | } | |
536 | ||
537 | ||
538 | /*-------------------------------------------------------------------------*/ | |
539 | ||
540 | /* Sync the file data, don't bother with the metadata. | |
541 | * This code was copied from fs/buffer.c:sys_fdatasync(). */ | |
542 | static int fsync_sub(struct lun *curlun) | |
543 | { | |
544 | struct file *filp = curlun->filp; | |
545 | ||
546 | if (curlun->ro || !filp) | |
547 | return 0; | |
548 | return vfs_fsync(filp, filp->f_path.dentry, 1); | |
549 | } | |
550 | ||
551 | static void store_cdrom_address(u8 *dest, int msf, u32 addr) | |
552 | { | |
553 | if (msf) { | |
554 | /* Convert to Minutes-Seconds-Frames */ | |
555 | addr >>= 2; /* Convert to 2048-byte frames */ | |
556 | addr += 2*75; /* Lead-in occupies 2 seconds */ | |
557 | dest[3] = addr % 75; /* Frames */ | |
558 | addr /= 75; | |
559 | dest[2] = addr % 60; /* Seconds */ | |
560 | addr /= 60; | |
561 | dest[1] = addr; /* Minutes */ | |
562 | dest[0] = 0; /* Reserved */ | |
563 | } else { | |
564 | /* Absolute sector */ | |
565 | put_unaligned_be32(addr, dest); | |
566 | } | |
567 | } |