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1da177e4 LT |
1 | /* |
2 | * sd.c Copyright (C) 1992 Drew Eckhardt | |
3 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale | |
4 | * | |
5 | * Linux scsi disk driver | |
6 | * Initial versions: Drew Eckhardt | |
7 | * Subsequent revisions: Eric Youngdale | |
8 | * Modification history: | |
9 | * - Drew Eckhardt <drew@colorado.edu> original | |
10 | * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple | |
11 | * outstanding request, and other enhancements. | |
12 | * Support loadable low-level scsi drivers. | |
13 | * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using | |
14 | * eight major numbers. | |
15 | * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. | |
16 | * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in | |
17 | * sd_init and cleanups. | |
18 | * - Alex Davis <letmein@erols.com> Fix problem where partition info | |
19 | * not being read in sd_open. Fix problem where removable media | |
20 | * could be ejected after sd_open. | |
21 | * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x | |
22 | * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox | |
23 | * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: | |
24 | * Support 32k/1M disks. | |
25 | * | |
26 | * Logging policy (needs CONFIG_SCSI_LOGGING defined): | |
27 | * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 | |
28 | * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 | |
29 | * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 | |
30 | * - entering other commands: SCSI_LOG_HLQUEUE level 3 | |
31 | * Note: when the logging level is set by the user, it must be greater | |
32 | * than the level indicated above to trigger output. | |
33 | */ | |
34 | ||
35 | #include <linux/config.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/fs.h> | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/mm.h> | |
41 | #include <linux/bio.h> | |
42 | #include <linux/genhd.h> | |
43 | #include <linux/hdreg.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/idr.h> | |
46 | #include <linux/interrupt.h> | |
47 | #include <linux/init.h> | |
48 | #include <linux/blkdev.h> | |
49 | #include <linux/blkpg.h> | |
50 | #include <linux/kref.h> | |
51 | #include <linux/delay.h> | |
52 | #include <asm/uaccess.h> | |
53 | ||
54 | #include <scsi/scsi.h> | |
55 | #include <scsi/scsi_cmnd.h> | |
56 | #include <scsi/scsi_dbg.h> | |
57 | #include <scsi/scsi_device.h> | |
58 | #include <scsi/scsi_driver.h> | |
59 | #include <scsi/scsi_eh.h> | |
60 | #include <scsi/scsi_host.h> | |
61 | #include <scsi/scsi_ioctl.h> | |
62 | #include <scsi/scsi_request.h> | |
63 | #include <scsi/scsicam.h> | |
64 | ||
65 | #include "scsi_logging.h" | |
66 | ||
67 | /* | |
68 | * More than enough for everybody ;) The huge number of majors | |
69 | * is a leftover from 16bit dev_t days, we don't really need that | |
70 | * much numberspace. | |
71 | */ | |
72 | #define SD_MAJORS 16 | |
73 | ||
74 | /* | |
75 | * This is limited by the naming scheme enforced in sd_probe, | |
76 | * add another character to it if you really need more disks. | |
77 | */ | |
78 | #define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26) | |
79 | ||
80 | /* | |
81 | * Time out in seconds for disks and Magneto-opticals (which are slower). | |
82 | */ | |
83 | #define SD_TIMEOUT (30 * HZ) | |
84 | #define SD_MOD_TIMEOUT (75 * HZ) | |
85 | ||
86 | /* | |
87 | * Number of allowed retries | |
88 | */ | |
89 | #define SD_MAX_RETRIES 5 | |
90 | #define SD_PASSTHROUGH_RETRIES 1 | |
91 | ||
92 | static void scsi_disk_release(struct kref *kref); | |
93 | ||
94 | struct scsi_disk { | |
95 | struct scsi_driver *driver; /* always &sd_template */ | |
96 | struct scsi_device *device; | |
97 | struct kref kref; | |
98 | struct gendisk *disk; | |
99 | unsigned int openers; /* protected by BKL for now, yuck */ | |
100 | sector_t capacity; /* size in 512-byte sectors */ | |
101 | u32 index; | |
102 | u8 media_present; | |
103 | u8 write_prot; | |
104 | unsigned WCE : 1; /* state of disk WCE bit */ | |
105 | unsigned RCD : 1; /* state of disk RCD bit, unused */ | |
106 | }; | |
107 | ||
108 | static DEFINE_IDR(sd_index_idr); | |
109 | static DEFINE_SPINLOCK(sd_index_lock); | |
110 | ||
111 | /* This semaphore is used to mediate the 0->1 reference get in the | |
112 | * face of object destruction (i.e. we can't allow a get on an | |
113 | * object after last put) */ | |
114 | static DECLARE_MUTEX(sd_ref_sem); | |
115 | ||
116 | static int sd_revalidate_disk(struct gendisk *disk); | |
117 | static void sd_rw_intr(struct scsi_cmnd * SCpnt); | |
118 | ||
119 | static int sd_probe(struct device *); | |
120 | static int sd_remove(struct device *); | |
121 | static void sd_shutdown(struct device *dev); | |
122 | static void sd_rescan(struct device *); | |
123 | static int sd_init_command(struct scsi_cmnd *); | |
124 | static int sd_issue_flush(struct device *, sector_t *); | |
125 | static void sd_end_flush(request_queue_t *, struct request *); | |
126 | static int sd_prepare_flush(request_queue_t *, struct request *); | |
127 | static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname, | |
128 | struct scsi_request *SRpnt, unsigned char *buffer); | |
129 | ||
130 | static struct scsi_driver sd_template = { | |
131 | .owner = THIS_MODULE, | |
132 | .gendrv = { | |
133 | .name = "sd", | |
134 | .probe = sd_probe, | |
135 | .remove = sd_remove, | |
136 | .shutdown = sd_shutdown, | |
137 | }, | |
138 | .rescan = sd_rescan, | |
139 | .init_command = sd_init_command, | |
140 | .issue_flush = sd_issue_flush, | |
141 | .prepare_flush = sd_prepare_flush, | |
142 | .end_flush = sd_end_flush, | |
143 | }; | |
144 | ||
145 | /* | |
146 | * Device no to disk mapping: | |
147 | * | |
148 | * major disc2 disc p1 | |
149 | * |............|.............|....|....| <- dev_t | |
150 | * 31 20 19 8 7 4 3 0 | |
151 | * | |
152 | * Inside a major, we have 16k disks, however mapped non- | |
153 | * contiguously. The first 16 disks are for major0, the next | |
154 | * ones with major1, ... Disk 256 is for major0 again, disk 272 | |
155 | * for major1, ... | |
156 | * As we stay compatible with our numbering scheme, we can reuse | |
157 | * the well-know SCSI majors 8, 65--71, 136--143. | |
158 | */ | |
159 | static int sd_major(int major_idx) | |
160 | { | |
161 | switch (major_idx) { | |
162 | case 0: | |
163 | return SCSI_DISK0_MAJOR; | |
164 | case 1 ... 7: | |
165 | return SCSI_DISK1_MAJOR + major_idx - 1; | |
166 | case 8 ... 15: | |
167 | return SCSI_DISK8_MAJOR + major_idx - 8; | |
168 | default: | |
169 | BUG(); | |
170 | return 0; /* shut up gcc */ | |
171 | } | |
172 | } | |
173 | ||
174 | #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,kref) | |
175 | ||
176 | static inline struct scsi_disk *scsi_disk(struct gendisk *disk) | |
177 | { | |
178 | return container_of(disk->private_data, struct scsi_disk, driver); | |
179 | } | |
180 | ||
181 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
182 | { | |
183 | struct scsi_disk *sdkp = NULL; | |
184 | ||
185 | down(&sd_ref_sem); | |
186 | if (disk->private_data == NULL) | |
187 | goto out; | |
188 | sdkp = scsi_disk(disk); | |
189 | kref_get(&sdkp->kref); | |
190 | if (scsi_device_get(sdkp->device)) | |
191 | goto out_put; | |
192 | up(&sd_ref_sem); | |
193 | return sdkp; | |
194 | ||
195 | out_put: | |
196 | kref_put(&sdkp->kref, scsi_disk_release); | |
197 | sdkp = NULL; | |
198 | out: | |
199 | up(&sd_ref_sem); | |
200 | return sdkp; | |
201 | } | |
202 | ||
203 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
204 | { | |
205 | struct scsi_device *sdev = sdkp->device; | |
206 | ||
207 | down(&sd_ref_sem); | |
208 | kref_put(&sdkp->kref, scsi_disk_release); | |
209 | scsi_device_put(sdev); | |
210 | up(&sd_ref_sem); | |
211 | } | |
212 | ||
213 | /** | |
214 | * sd_init_command - build a scsi (read or write) command from | |
215 | * information in the request structure. | |
216 | * @SCpnt: pointer to mid-level's per scsi command structure that | |
217 | * contains request and into which the scsi command is written | |
218 | * | |
219 | * Returns 1 if successful and 0 if error (or cannot be done now). | |
220 | **/ | |
221 | static int sd_init_command(struct scsi_cmnd * SCpnt) | |
222 | { | |
223 | unsigned int this_count, timeout; | |
224 | struct gendisk *disk; | |
225 | sector_t block; | |
226 | struct scsi_device *sdp = SCpnt->device; | |
227 | struct request *rq = SCpnt->request; | |
228 | ||
229 | timeout = sdp->timeout; | |
230 | ||
231 | /* | |
232 | * SG_IO from block layer already setup, just copy cdb basically | |
233 | */ | |
234 | if (blk_pc_request(rq)) { | |
235 | if (sizeof(rq->cmd) > sizeof(SCpnt->cmnd)) | |
236 | return 0; | |
237 | ||
238 | memcpy(SCpnt->cmnd, rq->cmd, sizeof(SCpnt->cmnd)); | |
239 | if (rq_data_dir(rq) == WRITE) | |
240 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
241 | else if (rq->data_len) | |
242 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
243 | else | |
244 | SCpnt->sc_data_direction = DMA_NONE; | |
245 | ||
246 | this_count = rq->data_len; | |
247 | if (rq->timeout) | |
248 | timeout = rq->timeout; | |
249 | ||
250 | SCpnt->transfersize = rq->data_len; | |
251 | SCpnt->allowed = SD_PASSTHROUGH_RETRIES; | |
252 | goto queue; | |
253 | } | |
254 | ||
255 | /* | |
256 | * we only do REQ_CMD and REQ_BLOCK_PC | |
257 | */ | |
258 | if (!blk_fs_request(rq)) | |
259 | return 0; | |
260 | ||
261 | disk = rq->rq_disk; | |
262 | block = rq->sector; | |
263 | this_count = SCpnt->request_bufflen >> 9; | |
264 | ||
265 | SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, " | |
266 | "count=%d\n", disk->disk_name, | |
267 | (unsigned long long)block, this_count)); | |
268 | ||
269 | if (!sdp || !scsi_device_online(sdp) || | |
270 | block + rq->nr_sectors > get_capacity(disk)) { | |
271 | SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", | |
272 | rq->nr_sectors)); | |
273 | SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); | |
274 | return 0; | |
275 | } | |
276 | ||
277 | if (sdp->changed) { | |
278 | /* | |
279 | * quietly refuse to do anything to a changed disc until | |
280 | * the changed bit has been reset | |
281 | */ | |
282 | /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ | |
283 | return 0; | |
284 | } | |
285 | SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n", | |
286 | disk->disk_name, (unsigned long long)block)); | |
287 | ||
288 | /* | |
289 | * If we have a 1K hardware sectorsize, prevent access to single | |
290 | * 512 byte sectors. In theory we could handle this - in fact | |
291 | * the scsi cdrom driver must be able to handle this because | |
292 | * we typically use 1K blocksizes, and cdroms typically have | |
293 | * 2K hardware sectorsizes. Of course, things are simpler | |
294 | * with the cdrom, since it is read-only. For performance | |
295 | * reasons, the filesystems should be able to handle this | |
296 | * and not force the scsi disk driver to use bounce buffers | |
297 | * for this. | |
298 | */ | |
299 | if (sdp->sector_size == 1024) { | |
300 | if ((block & 1) || (rq->nr_sectors & 1)) { | |
301 | printk(KERN_ERR "sd: Bad block number requested"); | |
302 | return 0; | |
303 | } else { | |
304 | block = block >> 1; | |
305 | this_count = this_count >> 1; | |
306 | } | |
307 | } | |
308 | if (sdp->sector_size == 2048) { | |
309 | if ((block & 3) || (rq->nr_sectors & 3)) { | |
310 | printk(KERN_ERR "sd: Bad block number requested"); | |
311 | return 0; | |
312 | } else { | |
313 | block = block >> 2; | |
314 | this_count = this_count >> 2; | |
315 | } | |
316 | } | |
317 | if (sdp->sector_size == 4096) { | |
318 | if ((block & 7) || (rq->nr_sectors & 7)) { | |
319 | printk(KERN_ERR "sd: Bad block number requested"); | |
320 | return 0; | |
321 | } else { | |
322 | block = block >> 3; | |
323 | this_count = this_count >> 3; | |
324 | } | |
325 | } | |
326 | if (rq_data_dir(rq) == WRITE) { | |
327 | if (!sdp->writeable) { | |
328 | return 0; | |
329 | } | |
330 | SCpnt->cmnd[0] = WRITE_6; | |
331 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
332 | } else if (rq_data_dir(rq) == READ) { | |
333 | SCpnt->cmnd[0] = READ_6; | |
334 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
335 | } else { | |
336 | printk(KERN_ERR "sd: Unknown command %lx\n", rq->flags); | |
337 | /* overkill panic("Unknown sd command %lx\n", rq->flags); */ | |
338 | return 0; | |
339 | } | |
340 | ||
341 | SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", | |
342 | disk->disk_name, (rq_data_dir(rq) == WRITE) ? | |
343 | "writing" : "reading", this_count, rq->nr_sectors)); | |
344 | ||
345 | SCpnt->cmnd[1] = 0; | |
346 | ||
347 | if (block > 0xffffffff) { | |
348 | SCpnt->cmnd[0] += READ_16 - READ_6; | |
349 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; | |
350 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
351 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
352 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
353 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; | |
354 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; | |
355 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; | |
356 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; | |
357 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; | |
358 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; | |
359 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; | |
360 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; | |
361 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; | |
362 | } else if ((this_count > 0xff) || (block > 0x1fffff) || | |
363 | SCpnt->device->use_10_for_rw) { | |
364 | if (this_count > 0xffff) | |
365 | this_count = 0xffff; | |
366 | ||
367 | SCpnt->cmnd[0] += READ_10 - READ_6; | |
368 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; | |
369 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
370 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
371 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
372 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
373 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
374 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
375 | } else { | |
376 | if (this_count > 0xff) | |
377 | this_count = 0xff; | |
378 | ||
379 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); | |
380 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); | |
381 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; | |
382 | SCpnt->cmnd[4] = (unsigned char) this_count; | |
383 | SCpnt->cmnd[5] = 0; | |
384 | } | |
385 | SCpnt->request_bufflen = SCpnt->bufflen = | |
386 | this_count * sdp->sector_size; | |
387 | ||
388 | /* | |
389 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
390 | * host adapter, it's safe to assume that we can at least transfer | |
391 | * this many bytes between each connect / disconnect. | |
392 | */ | |
393 | SCpnt->transfersize = sdp->sector_size; | |
394 | SCpnt->underflow = this_count << 9; | |
395 | SCpnt->allowed = SD_MAX_RETRIES; | |
396 | ||
397 | queue: | |
398 | SCpnt->timeout_per_command = timeout; | |
399 | ||
400 | /* | |
401 | * This is the completion routine we use. This is matched in terms | |
402 | * of capability to this function. | |
403 | */ | |
404 | SCpnt->done = sd_rw_intr; | |
405 | ||
406 | /* | |
407 | * This indicates that the command is ready from our end to be | |
408 | * queued. | |
409 | */ | |
410 | return 1; | |
411 | } | |
412 | ||
413 | /** | |
414 | * sd_open - open a scsi disk device | |
415 | * @inode: only i_rdev member may be used | |
416 | * @filp: only f_mode and f_flags may be used | |
417 | * | |
418 | * Returns 0 if successful. Returns a negated errno value in case | |
419 | * of error. | |
420 | * | |
421 | * Note: This can be called from a user context (e.g. fsck(1) ) | |
422 | * or from within the kernel (e.g. as a result of a mount(1) ). | |
423 | * In the latter case @inode and @filp carry an abridged amount | |
424 | * of information as noted above. | |
425 | **/ | |
426 | static int sd_open(struct inode *inode, struct file *filp) | |
427 | { | |
428 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
429 | struct scsi_disk *sdkp; | |
430 | struct scsi_device *sdev; | |
431 | int retval; | |
432 | ||
433 | if (!(sdkp = scsi_disk_get(disk))) | |
434 | return -ENXIO; | |
435 | ||
436 | ||
437 | SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk->disk_name)); | |
438 | ||
439 | sdev = sdkp->device; | |
440 | ||
441 | /* | |
442 | * If the device is in error recovery, wait until it is done. | |
443 | * If the device is offline, then disallow any access to it. | |
444 | */ | |
445 | retval = -ENXIO; | |
446 | if (!scsi_block_when_processing_errors(sdev)) | |
447 | goto error_out; | |
448 | ||
449 | if (sdev->removable || sdkp->write_prot) | |
450 | check_disk_change(inode->i_bdev); | |
451 | ||
452 | /* | |
453 | * If the drive is empty, just let the open fail. | |
454 | */ | |
455 | retval = -ENOMEDIUM; | |
456 | if (sdev->removable && !sdkp->media_present && | |
457 | !(filp->f_flags & O_NDELAY)) | |
458 | goto error_out; | |
459 | ||
460 | /* | |
461 | * If the device has the write protect tab set, have the open fail | |
462 | * if the user expects to be able to write to the thing. | |
463 | */ | |
464 | retval = -EROFS; | |
465 | if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) | |
466 | goto error_out; | |
467 | ||
468 | /* | |
469 | * It is possible that the disk changing stuff resulted in | |
470 | * the device being taken offline. If this is the case, | |
471 | * report this to the user, and don't pretend that the | |
472 | * open actually succeeded. | |
473 | */ | |
474 | retval = -ENXIO; | |
475 | if (!scsi_device_online(sdev)) | |
476 | goto error_out; | |
477 | ||
478 | if (!sdkp->openers++ && sdev->removable) { | |
479 | if (scsi_block_when_processing_errors(sdev)) | |
480 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); | |
481 | } | |
482 | ||
483 | return 0; | |
484 | ||
485 | error_out: | |
486 | scsi_disk_put(sdkp); | |
487 | return retval; | |
488 | } | |
489 | ||
490 | /** | |
491 | * sd_release - invoked when the (last) close(2) is called on this | |
492 | * scsi disk. | |
493 | * @inode: only i_rdev member may be used | |
494 | * @filp: only f_mode and f_flags may be used | |
495 | * | |
496 | * Returns 0. | |
497 | * | |
498 | * Note: may block (uninterruptible) if error recovery is underway | |
499 | * on this disk. | |
500 | **/ | |
501 | static int sd_release(struct inode *inode, struct file *filp) | |
502 | { | |
503 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
504 | struct scsi_disk *sdkp = scsi_disk(disk); | |
505 | struct scsi_device *sdev = sdkp->device; | |
506 | ||
507 | SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk->disk_name)); | |
508 | ||
509 | if (!--sdkp->openers && sdev->removable) { | |
510 | if (scsi_block_when_processing_errors(sdev)) | |
511 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); | |
512 | } | |
513 | ||
514 | /* | |
515 | * XXX and what if there are packets in flight and this close() | |
516 | * XXX is followed by a "rmmod sd_mod"? | |
517 | */ | |
518 | scsi_disk_put(sdkp); | |
519 | return 0; | |
520 | } | |
521 | ||
522 | static int sd_hdio_getgeo(struct block_device *bdev, struct hd_geometry __user *loc) | |
523 | { | |
524 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); | |
525 | struct scsi_device *sdp = sdkp->device; | |
526 | struct Scsi_Host *host = sdp->host; | |
527 | int diskinfo[4]; | |
528 | ||
529 | /* default to most commonly used values */ | |
530 | diskinfo[0] = 0x40; /* 1 << 6 */ | |
531 | diskinfo[1] = 0x20; /* 1 << 5 */ | |
532 | diskinfo[2] = sdkp->capacity >> 11; | |
533 | ||
534 | /* override with calculated, extended default, or driver values */ | |
535 | if (host->hostt->bios_param) | |
536 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); | |
537 | else | |
538 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); | |
539 | ||
540 | if (put_user(diskinfo[0], &loc->heads)) | |
541 | return -EFAULT; | |
542 | if (put_user(diskinfo[1], &loc->sectors)) | |
543 | return -EFAULT; | |
544 | if (put_user(diskinfo[2], &loc->cylinders)) | |
545 | return -EFAULT; | |
546 | if (put_user((unsigned)get_start_sect(bdev), | |
547 | (unsigned long __user *)&loc->start)) | |
548 | return -EFAULT; | |
549 | return 0; | |
550 | } | |
551 | ||
552 | /** | |
553 | * sd_ioctl - process an ioctl | |
554 | * @inode: only i_rdev/i_bdev members may be used | |
555 | * @filp: only f_mode and f_flags may be used | |
556 | * @cmd: ioctl command number | |
557 | * @arg: this is third argument given to ioctl(2) system call. | |
558 | * Often contains a pointer. | |
559 | * | |
560 | * Returns 0 if successful (some ioctls return postive numbers on | |
561 | * success as well). Returns a negated errno value in case of error. | |
562 | * | |
563 | * Note: most ioctls are forward onto the block subsystem or further | |
564 | * down in the scsi subsytem. | |
565 | **/ | |
566 | static int sd_ioctl(struct inode * inode, struct file * filp, | |
567 | unsigned int cmd, unsigned long arg) | |
568 | { | |
569 | struct block_device *bdev = inode->i_bdev; | |
570 | struct gendisk *disk = bdev->bd_disk; | |
571 | struct scsi_device *sdp = scsi_disk(disk)->device; | |
572 | void __user *p = (void __user *)arg; | |
573 | int error; | |
574 | ||
575 | SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", | |
576 | disk->disk_name, cmd)); | |
577 | ||
578 | /* | |
579 | * If we are in the middle of error recovery, don't let anyone | |
580 | * else try and use this device. Also, if error recovery fails, it | |
581 | * may try and take the device offline, in which case all further | |
582 | * access to the device is prohibited. | |
583 | */ | |
584 | error = scsi_nonblockable_ioctl(sdp, cmd, p, filp); | |
585 | if (!scsi_block_when_processing_errors(sdp) || !error) | |
586 | return error; | |
587 | ||
588 | if (cmd == HDIO_GETGEO) { | |
589 | if (!arg) | |
590 | return -EINVAL; | |
591 | return sd_hdio_getgeo(bdev, p); | |
592 | } | |
593 | ||
594 | /* | |
595 | * Send SCSI addressing ioctls directly to mid level, send other | |
596 | * ioctls to block level and then onto mid level if they can't be | |
597 | * resolved. | |
598 | */ | |
599 | switch (cmd) { | |
600 | case SCSI_IOCTL_GET_IDLUN: | |
601 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
602 | return scsi_ioctl(sdp, cmd, p); | |
603 | default: | |
604 | error = scsi_cmd_ioctl(filp, disk, cmd, p); | |
605 | if (error != -ENOTTY) | |
606 | return error; | |
607 | } | |
608 | return scsi_ioctl(sdp, cmd, p); | |
609 | } | |
610 | ||
611 | static void set_media_not_present(struct scsi_disk *sdkp) | |
612 | { | |
613 | sdkp->media_present = 0; | |
614 | sdkp->capacity = 0; | |
615 | sdkp->device->changed = 1; | |
616 | } | |
617 | ||
618 | /** | |
619 | * sd_media_changed - check if our medium changed | |
620 | * @disk: kernel device descriptor | |
621 | * | |
622 | * Returns 0 if not applicable or no change; 1 if change | |
623 | * | |
624 | * Note: this function is invoked from the block subsystem. | |
625 | **/ | |
626 | static int sd_media_changed(struct gendisk *disk) | |
627 | { | |
628 | struct scsi_disk *sdkp = scsi_disk(disk); | |
629 | struct scsi_device *sdp = sdkp->device; | |
630 | int retval; | |
631 | ||
632 | SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n", | |
633 | disk->disk_name)); | |
634 | ||
635 | if (!sdp->removable) | |
636 | return 0; | |
637 | ||
638 | /* | |
639 | * If the device is offline, don't send any commands - just pretend as | |
640 | * if the command failed. If the device ever comes back online, we | |
641 | * can deal with it then. It is only because of unrecoverable errors | |
642 | * that we would ever take a device offline in the first place. | |
643 | */ | |
644 | if (!scsi_device_online(sdp)) | |
645 | goto not_present; | |
646 | ||
647 | /* | |
648 | * Using TEST_UNIT_READY enables differentiation between drive with | |
649 | * no cartridge loaded - NOT READY, drive with changed cartridge - | |
650 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. | |
651 | * | |
652 | * Drives that auto spin down. eg iomega jaz 1G, will be started | |
653 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever | |
654 | * sd_revalidate() is called. | |
655 | */ | |
656 | retval = -ENODEV; | |
657 | if (scsi_block_when_processing_errors(sdp)) | |
658 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES); | |
659 | ||
660 | /* | |
661 | * Unable to test, unit probably not ready. This usually | |
662 | * means there is no disc in the drive. Mark as changed, | |
663 | * and we will figure it out later once the drive is | |
664 | * available again. | |
665 | */ | |
666 | if (retval) | |
667 | goto not_present; | |
668 | ||
669 | /* | |
670 | * For removable scsi disk we have to recognise the presence | |
671 | * of a disk in the drive. This is kept in the struct scsi_disk | |
672 | * struct and tested at open ! Daniel Roche (dan@lectra.fr) | |
673 | */ | |
674 | sdkp->media_present = 1; | |
675 | ||
676 | retval = sdp->changed; | |
677 | sdp->changed = 0; | |
678 | ||
679 | return retval; | |
680 | ||
681 | not_present: | |
682 | set_media_not_present(sdkp); | |
683 | return 1; | |
684 | } | |
685 | ||
686 | static int sd_sync_cache(struct scsi_device *sdp) | |
687 | { | |
688 | struct scsi_request *sreq; | |
689 | int retries, res; | |
690 | ||
691 | if (!scsi_device_online(sdp)) | |
692 | return -ENODEV; | |
693 | ||
694 | sreq = scsi_allocate_request(sdp, GFP_KERNEL); | |
695 | if (!sreq) { | |
696 | printk("FAILED\n No memory for request\n"); | |
697 | return -ENOMEM; | |
698 | } | |
699 | ||
700 | sreq->sr_data_direction = DMA_NONE; | |
701 | for (retries = 3; retries > 0; --retries) { | |
702 | unsigned char cmd[10] = { 0 }; | |
703 | ||
704 | cmd[0] = SYNCHRONIZE_CACHE; | |
705 | /* | |
706 | * Leave the rest of the command zero to indicate | |
707 | * flush everything. | |
708 | */ | |
709 | scsi_wait_req(sreq, cmd, NULL, 0, SD_TIMEOUT, SD_MAX_RETRIES); | |
710 | if (sreq->sr_result == 0) | |
711 | break; | |
712 | } | |
713 | ||
714 | res = sreq->sr_result; | |
715 | if (res) { | |
716 | printk(KERN_WARNING "FAILED\n status = %x, message = %02x, " | |
717 | "host = %d, driver = %02x\n ", | |
718 | status_byte(res), msg_byte(res), | |
719 | host_byte(res), driver_byte(res)); | |
720 | if (driver_byte(res) & DRIVER_SENSE) | |
721 | scsi_print_req_sense("sd", sreq); | |
722 | } | |
723 | ||
724 | scsi_release_request(sreq); | |
725 | return res; | |
726 | } | |
727 | ||
728 | static int sd_issue_flush(struct device *dev, sector_t *error_sector) | |
729 | { | |
730 | struct scsi_device *sdp = to_scsi_device(dev); | |
731 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
732 | ||
733 | if (!sdkp) | |
734 | return -ENODEV; | |
735 | ||
736 | if (!sdkp->WCE) | |
737 | return 0; | |
738 | ||
739 | return sd_sync_cache(sdp); | |
740 | } | |
741 | ||
742 | static void sd_end_flush(request_queue_t *q, struct request *flush_rq) | |
743 | { | |
744 | struct request *rq = flush_rq->end_io_data; | |
745 | struct scsi_cmnd *cmd = rq->special; | |
746 | unsigned int bytes = rq->hard_nr_sectors << 9; | |
747 | ||
748 | if (!flush_rq->errors) { | |
749 | spin_unlock(q->queue_lock); | |
750 | scsi_io_completion(cmd, bytes, 0); | |
751 | spin_lock(q->queue_lock); | |
752 | } else if (blk_barrier_postflush(rq)) { | |
753 | spin_unlock(q->queue_lock); | |
754 | scsi_io_completion(cmd, 0, bytes); | |
755 | spin_lock(q->queue_lock); | |
756 | } else { | |
757 | /* | |
758 | * force journal abort of barriers | |
759 | */ | |
760 | end_that_request_first(rq, -EOPNOTSUPP, rq->hard_nr_sectors); | |
761 | end_that_request_last(rq); | |
762 | } | |
763 | } | |
764 | ||
765 | static int sd_prepare_flush(request_queue_t *q, struct request *rq) | |
766 | { | |
767 | struct scsi_device *sdev = q->queuedata; | |
768 | struct scsi_disk *sdkp = dev_get_drvdata(&sdev->sdev_gendev); | |
769 | ||
770 | if (sdkp->WCE) { | |
771 | memset(rq->cmd, 0, sizeof(rq->cmd)); | |
772 | rq->flags |= REQ_BLOCK_PC | REQ_SOFTBARRIER; | |
773 | rq->timeout = SD_TIMEOUT; | |
774 | rq->cmd[0] = SYNCHRONIZE_CACHE; | |
775 | return 1; | |
776 | } | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
781 | static void sd_rescan(struct device *dev) | |
782 | { | |
783 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
784 | sd_revalidate_disk(sdkp->disk); | |
785 | } | |
786 | ||
787 | ||
788 | #ifdef CONFIG_COMPAT | |
789 | /* | |
790 | * This gets directly called from VFS. When the ioctl | |
791 | * is not recognized we go back to the other translation paths. | |
792 | */ | |
793 | static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
794 | { | |
795 | struct block_device *bdev = file->f_dentry->d_inode->i_bdev; | |
796 | struct gendisk *disk = bdev->bd_disk; | |
797 | struct scsi_device *sdev = scsi_disk(disk)->device; | |
798 | ||
799 | /* | |
800 | * If we are in the middle of error recovery, don't let anyone | |
801 | * else try and use this device. Also, if error recovery fails, it | |
802 | * may try and take the device offline, in which case all further | |
803 | * access to the device is prohibited. | |
804 | */ | |
805 | if (!scsi_block_when_processing_errors(sdev)) | |
806 | return -ENODEV; | |
807 | ||
808 | if (sdev->host->hostt->compat_ioctl) { | |
809 | int ret; | |
810 | ||
811 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
812 | ||
813 | return ret; | |
814 | } | |
815 | ||
816 | /* | |
817 | * Let the static ioctl translation table take care of it. | |
818 | */ | |
819 | return -ENOIOCTLCMD; | |
820 | } | |
821 | #endif | |
822 | ||
823 | static struct block_device_operations sd_fops = { | |
824 | .owner = THIS_MODULE, | |
825 | .open = sd_open, | |
826 | .release = sd_release, | |
827 | .ioctl = sd_ioctl, | |
828 | #ifdef CONFIG_COMPAT | |
829 | .compat_ioctl = sd_compat_ioctl, | |
830 | #endif | |
831 | .media_changed = sd_media_changed, | |
832 | .revalidate_disk = sd_revalidate_disk, | |
833 | }; | |
834 | ||
835 | /** | |
836 | * sd_rw_intr - bottom half handler: called when the lower level | |
837 | * driver has completed (successfully or otherwise) a scsi command. | |
838 | * @SCpnt: mid-level's per command structure. | |
839 | * | |
840 | * Note: potentially run from within an ISR. Must not block. | |
841 | **/ | |
842 | static void sd_rw_intr(struct scsi_cmnd * SCpnt) | |
843 | { | |
844 | int result = SCpnt->result; | |
845 | int this_count = SCpnt->bufflen; | |
846 | int good_bytes = (result == 0 ? this_count : 0); | |
847 | sector_t block_sectors = 1; | |
848 | u64 first_err_block; | |
849 | sector_t error_sector; | |
850 | struct scsi_sense_hdr sshdr; | |
851 | int sense_valid = 0; | |
852 | int sense_deferred = 0; | |
853 | int info_valid; | |
854 | ||
855 | if (result) { | |
856 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); | |
857 | if (sense_valid) | |
858 | sense_deferred = scsi_sense_is_deferred(&sshdr); | |
859 | } | |
860 | ||
861 | #ifdef CONFIG_SCSI_LOGGING | |
862 | SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n", | |
863 | SCpnt->request->rq_disk->disk_name, result)); | |
864 | if (sense_valid) { | |
865 | SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc," | |
866 | "ascq]=%x,%x,%x,%x\n", sshdr.response_code, | |
867 | sshdr.sense_key, sshdr.asc, sshdr.ascq)); | |
868 | } | |
869 | #endif | |
870 | /* | |
871 | Handle MEDIUM ERRORs that indicate partial success. Since this is a | |
872 | relatively rare error condition, no care is taken to avoid | |
873 | unnecessary additional work such as memcpy's that could be avoided. | |
874 | */ | |
875 | ||
876 | /* | |
877 | * If SG_IO from block layer then set good_bytes to stop retries; | |
878 | * else if errors, check them, and if necessary prepare for | |
879 | * (partial) retries. | |
880 | */ | |
881 | if (blk_pc_request(SCpnt->request)) | |
882 | good_bytes = this_count; | |
883 | else if (driver_byte(result) != 0 && | |
884 | sense_valid && !sense_deferred) { | |
885 | switch (sshdr.sense_key) { | |
886 | case MEDIUM_ERROR: | |
887 | if (!blk_fs_request(SCpnt->request)) | |
888 | break; | |
889 | info_valid = scsi_get_sense_info_fld( | |
890 | SCpnt->sense_buffer, SCSI_SENSE_BUFFERSIZE, | |
891 | &first_err_block); | |
892 | /* | |
893 | * May want to warn and skip if following cast results | |
894 | * in actual truncation (if sector_t < 64 bits) | |
895 | */ | |
896 | error_sector = (sector_t)first_err_block; | |
897 | if (SCpnt->request->bio != NULL) | |
898 | block_sectors = bio_sectors(SCpnt->request->bio); | |
899 | switch (SCpnt->device->sector_size) { | |
900 | case 1024: | |
901 | error_sector <<= 1; | |
902 | if (block_sectors < 2) | |
903 | block_sectors = 2; | |
904 | break; | |
905 | case 2048: | |
906 | error_sector <<= 2; | |
907 | if (block_sectors < 4) | |
908 | block_sectors = 4; | |
909 | break; | |
910 | case 4096: | |
911 | error_sector <<=3; | |
912 | if (block_sectors < 8) | |
913 | block_sectors = 8; | |
914 | break; | |
915 | case 256: | |
916 | error_sector >>= 1; | |
917 | break; | |
918 | default: | |
919 | break; | |
920 | } | |
921 | ||
922 | error_sector &= ~(block_sectors - 1); | |
923 | good_bytes = (error_sector - SCpnt->request->sector) << 9; | |
924 | if (good_bytes < 0 || good_bytes >= this_count) | |
925 | good_bytes = 0; | |
926 | break; | |
927 | ||
928 | case RECOVERED_ERROR: /* an error occurred, but it recovered */ | |
929 | case NO_SENSE: /* LLDD got sense data */ | |
930 | /* | |
931 | * Inform the user, but make sure that it's not treated | |
932 | * as a hard error. | |
933 | */ | |
934 | scsi_print_sense("sd", SCpnt); | |
935 | SCpnt->result = 0; | |
936 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
937 | good_bytes = this_count; | |
938 | break; | |
939 | ||
940 | case ILLEGAL_REQUEST: | |
941 | if (SCpnt->device->use_10_for_rw && | |
942 | (SCpnt->cmnd[0] == READ_10 || | |
943 | SCpnt->cmnd[0] == WRITE_10)) | |
944 | SCpnt->device->use_10_for_rw = 0; | |
945 | if (SCpnt->device->use_10_for_ms && | |
946 | (SCpnt->cmnd[0] == MODE_SENSE_10 || | |
947 | SCpnt->cmnd[0] == MODE_SELECT_10)) | |
948 | SCpnt->device->use_10_for_ms = 0; | |
949 | break; | |
950 | ||
951 | default: | |
952 | break; | |
953 | } | |
954 | } | |
955 | /* | |
956 | * This calls the generic completion function, now that we know | |
957 | * how many actual sectors finished, and how many sectors we need | |
958 | * to say have failed. | |
959 | */ | |
960 | scsi_io_completion(SCpnt, good_bytes, block_sectors << 9); | |
961 | } | |
962 | ||
963 | static int media_not_present(struct scsi_disk *sdkp, struct scsi_request *srp) | |
964 | { | |
965 | struct scsi_sense_hdr sshdr; | |
966 | ||
967 | if (!srp->sr_result) | |
968 | return 0; | |
969 | if (!(driver_byte(srp->sr_result) & DRIVER_SENSE)) | |
970 | return 0; | |
971 | /* not invoked for commands that could return deferred errors */ | |
972 | if (scsi_request_normalize_sense(srp, &sshdr)) { | |
973 | if (sshdr.sense_key != NOT_READY && | |
974 | sshdr.sense_key != UNIT_ATTENTION) | |
975 | return 0; | |
976 | if (sshdr.asc != 0x3A) /* medium not present */ | |
977 | return 0; | |
978 | } | |
979 | set_media_not_present(sdkp); | |
980 | return 1; | |
981 | } | |
982 | ||
983 | /* | |
984 | * spinup disk - called only in sd_revalidate_disk() | |
985 | */ | |
986 | static void | |
987 | sd_spinup_disk(struct scsi_disk *sdkp, char *diskname, | |
988 | struct scsi_request *SRpnt, unsigned char *buffer) { | |
989 | unsigned char cmd[10]; | |
990 | unsigned long spintime_value = 0; | |
991 | int retries, spintime; | |
992 | unsigned int the_result; | |
993 | struct scsi_sense_hdr sshdr; | |
994 | int sense_valid = 0; | |
995 | ||
996 | spintime = 0; | |
997 | ||
998 | /* Spin up drives, as required. Only do this at boot time */ | |
999 | /* Spinup needs to be done for module loads too. */ | |
1000 | do { | |
1001 | retries = 0; | |
1002 | ||
1003 | do { | |
1004 | cmd[0] = TEST_UNIT_READY; | |
1005 | memset((void *) &cmd[1], 0, 9); | |
1006 | ||
1007 | SRpnt->sr_cmd_len = 0; | |
1008 | memset(SRpnt->sr_sense_buffer, 0, | |
1009 | SCSI_SENSE_BUFFERSIZE); | |
1010 | SRpnt->sr_data_direction = DMA_NONE; | |
1011 | ||
1012 | scsi_wait_req (SRpnt, (void *) cmd, (void *) buffer, | |
1013 | 0/*512*/, SD_TIMEOUT, SD_MAX_RETRIES); | |
1014 | ||
1015 | the_result = SRpnt->sr_result; | |
1016 | if (the_result) | |
1017 | sense_valid = scsi_request_normalize_sense( | |
1018 | SRpnt, &sshdr); | |
1019 | retries++; | |
1020 | } while (retries < 3 && | |
1021 | (!scsi_status_is_good(the_result) || | |
1022 | ((driver_byte(the_result) & DRIVER_SENSE) && | |
1023 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); | |
1024 | ||
1025 | /* | |
1026 | * If the drive has indicated to us that it doesn't have | |
1027 | * any media in it, don't bother with any of the rest of | |
1028 | * this crap. | |
1029 | */ | |
1030 | if (media_not_present(sdkp, SRpnt)) | |
1031 | return; | |
1032 | ||
1033 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { | |
1034 | /* no sense, TUR either succeeded or failed | |
1035 | * with a status error */ | |
1036 | if(!spintime && !scsi_status_is_good(the_result)) | |
1037 | printk(KERN_NOTICE "%s: Unit Not Ready, " | |
1038 | "error = 0x%x\n", diskname, the_result); | |
1039 | break; | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * The device does not want the automatic start to be issued. | |
1044 | */ | |
1045 | if (sdkp->device->no_start_on_add) { | |
1046 | break; | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * If manual intervention is required, or this is an | |
1051 | * absent USB storage device, a spinup is meaningless. | |
1052 | */ | |
1053 | if (sense_valid && | |
1054 | sshdr.sense_key == NOT_READY && | |
1055 | sshdr.asc == 4 && sshdr.ascq == 3) { | |
1056 | break; /* manual intervention required */ | |
1057 | ||
1058 | /* | |
1059 | * Issue command to spin up drive when not ready | |
1060 | */ | |
1061 | } else if (sense_valid && sshdr.sense_key == NOT_READY) { | |
1062 | if (!spintime) { | |
1063 | printk(KERN_NOTICE "%s: Spinning up disk...", | |
1064 | diskname); | |
1065 | cmd[0] = START_STOP; | |
1066 | cmd[1] = 1; /* Return immediately */ | |
1067 | memset((void *) &cmd[2], 0, 8); | |
1068 | cmd[4] = 1; /* Start spin cycle */ | |
1069 | SRpnt->sr_cmd_len = 0; | |
1070 | memset(SRpnt->sr_sense_buffer, 0, | |
1071 | SCSI_SENSE_BUFFERSIZE); | |
1072 | ||
1073 | SRpnt->sr_data_direction = DMA_NONE; | |
1074 | scsi_wait_req(SRpnt, (void *)cmd, | |
1075 | (void *) buffer, 0/*512*/, | |
1076 | SD_TIMEOUT, SD_MAX_RETRIES); | |
1077 | spintime_value = jiffies; | |
1078 | } | |
1079 | spintime = 1; | |
1080 | /* Wait 1 second for next try */ | |
1081 | msleep(1000); | |
1082 | printk("."); | |
1083 | } else { | |
1084 | /* we don't understand the sense code, so it's | |
1085 | * probably pointless to loop */ | |
1086 | if(!spintime) { | |
1087 | printk(KERN_NOTICE "%s: Unit Not Ready, " | |
1088 | "sense:\n", diskname); | |
1089 | scsi_print_req_sense("", SRpnt); | |
1090 | } | |
1091 | break; | |
1092 | } | |
1093 | ||
1094 | } while (spintime && | |
1095 | time_after(spintime_value + 100 * HZ, jiffies)); | |
1096 | ||
1097 | if (spintime) { | |
1098 | if (scsi_status_is_good(the_result)) | |
1099 | printk("ready\n"); | |
1100 | else | |
1101 | printk("not responding...\n"); | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * read disk capacity | |
1107 | */ | |
1108 | static void | |
1109 | sd_read_capacity(struct scsi_disk *sdkp, char *diskname, | |
1110 | struct scsi_request *SRpnt, unsigned char *buffer) { | |
1111 | unsigned char cmd[16]; | |
1112 | struct scsi_device *sdp = sdkp->device; | |
1113 | int the_result, retries; | |
1114 | int sector_size = 0; | |
1115 | int longrc = 0; | |
1116 | struct scsi_sense_hdr sshdr; | |
1117 | int sense_valid = 0; | |
1118 | ||
1119 | repeat: | |
1120 | retries = 3; | |
1121 | do { | |
1122 | if (longrc) { | |
1123 | memset((void *) cmd, 0, 16); | |
1124 | cmd[0] = SERVICE_ACTION_IN; | |
1125 | cmd[1] = SAI_READ_CAPACITY_16; | |
1126 | cmd[13] = 12; | |
1127 | memset((void *) buffer, 0, 12); | |
1128 | } else { | |
1129 | cmd[0] = READ_CAPACITY; | |
1130 | memset((void *) &cmd[1], 0, 9); | |
1131 | memset((void *) buffer, 0, 8); | |
1132 | } | |
1133 | ||
1134 | SRpnt->sr_cmd_len = 0; | |
1135 | memset(SRpnt->sr_sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
1136 | SRpnt->sr_data_direction = DMA_FROM_DEVICE; | |
1137 | ||
1138 | scsi_wait_req(SRpnt, (void *) cmd, (void *) buffer, | |
1139 | longrc ? 12 : 8, SD_TIMEOUT, SD_MAX_RETRIES); | |
1140 | ||
1141 | if (media_not_present(sdkp, SRpnt)) | |
1142 | return; | |
1143 | ||
1144 | the_result = SRpnt->sr_result; | |
1145 | if (the_result) | |
1146 | sense_valid = scsi_request_normalize_sense(SRpnt, | |
1147 | &sshdr); | |
1148 | retries--; | |
1149 | ||
1150 | } while (the_result && retries); | |
1151 | ||
1152 | if (the_result && !longrc) { | |
1153 | printk(KERN_NOTICE "%s : READ CAPACITY failed.\n" | |
1154 | "%s : status=%x, message=%02x, host=%d, driver=%02x \n", | |
1155 | diskname, diskname, | |
1156 | status_byte(the_result), | |
1157 | msg_byte(the_result), | |
1158 | host_byte(the_result), | |
1159 | driver_byte(the_result)); | |
1160 | ||
1161 | if (driver_byte(the_result) & DRIVER_SENSE) | |
1162 | scsi_print_req_sense("sd", SRpnt); | |
1163 | else | |
1164 | printk("%s : sense not available. \n", diskname); | |
1165 | ||
1166 | /* Set dirty bit for removable devices if not ready - | |
1167 | * sometimes drives will not report this properly. */ | |
1168 | if (sdp->removable && | |
1169 | sense_valid && sshdr.sense_key == NOT_READY) | |
1170 | sdp->changed = 1; | |
1171 | ||
1172 | /* Either no media are present but the drive didn't tell us, | |
1173 | or they are present but the read capacity command fails */ | |
1174 | /* sdkp->media_present = 0; -- not always correct */ | |
1175 | sdkp->capacity = 0x200000; /* 1 GB - random */ | |
1176 | ||
1177 | return; | |
1178 | } else if (the_result && longrc) { | |
1179 | /* READ CAPACITY(16) has been failed */ | |
1180 | printk(KERN_NOTICE "%s : READ CAPACITY(16) failed.\n" | |
1181 | "%s : status=%x, message=%02x, host=%d, driver=%02x \n", | |
1182 | diskname, diskname, | |
1183 | status_byte(the_result), | |
1184 | msg_byte(the_result), | |
1185 | host_byte(the_result), | |
1186 | driver_byte(the_result)); | |
1187 | printk(KERN_NOTICE "%s : use 0xffffffff as device size\n", | |
1188 | diskname); | |
1189 | ||
1190 | sdkp->capacity = 1 + (sector_t) 0xffffffff; | |
1191 | goto got_data; | |
1192 | } | |
1193 | ||
1194 | if (!longrc) { | |
1195 | sector_size = (buffer[4] << 24) | | |
1196 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
1197 | if (buffer[0] == 0xff && buffer[1] == 0xff && | |
1198 | buffer[2] == 0xff && buffer[3] == 0xff) { | |
1199 | if(sizeof(sdkp->capacity) > 4) { | |
1200 | printk(KERN_NOTICE "%s : very big device. try to use" | |
1201 | " READ CAPACITY(16).\n", diskname); | |
1202 | longrc = 1; | |
1203 | goto repeat; | |
1204 | } | |
1205 | printk(KERN_ERR "%s: too big for this kernel. Use a " | |
1206 | "kernel compiled with support for large block " | |
1207 | "devices.\n", diskname); | |
1208 | sdkp->capacity = 0; | |
1209 | goto got_data; | |
1210 | } | |
1211 | sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | | |
1212 | (buffer[1] << 16) | | |
1213 | (buffer[2] << 8) | | |
1214 | buffer[3]); | |
1215 | } else { | |
1216 | sdkp->capacity = 1 + (((u64)buffer[0] << 56) | | |
1217 | ((u64)buffer[1] << 48) | | |
1218 | ((u64)buffer[2] << 40) | | |
1219 | ((u64)buffer[3] << 32) | | |
1220 | ((sector_t)buffer[4] << 24) | | |
1221 | ((sector_t)buffer[5] << 16) | | |
1222 | ((sector_t)buffer[6] << 8) | | |
1223 | (sector_t)buffer[7]); | |
1224 | ||
1225 | sector_size = (buffer[8] << 24) | | |
1226 | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; | |
1227 | } | |
1228 | ||
1229 | /* Some devices return the total number of sectors, not the | |
1230 | * highest sector number. Make the necessary adjustment. */ | |
1231 | if (sdp->fix_capacity) | |
1232 | --sdkp->capacity; | |
1233 | ||
1234 | got_data: | |
1235 | if (sector_size == 0) { | |
1236 | sector_size = 512; | |
1237 | printk(KERN_NOTICE "%s : sector size 0 reported, " | |
1238 | "assuming 512.\n", diskname); | |
1239 | } | |
1240 | ||
1241 | if (sector_size != 512 && | |
1242 | sector_size != 1024 && | |
1243 | sector_size != 2048 && | |
1244 | sector_size != 4096 && | |
1245 | sector_size != 256) { | |
1246 | printk(KERN_NOTICE "%s : unsupported sector size " | |
1247 | "%d.\n", diskname, sector_size); | |
1248 | /* | |
1249 | * The user might want to re-format the drive with | |
1250 | * a supported sectorsize. Once this happens, it | |
1251 | * would be relatively trivial to set the thing up. | |
1252 | * For this reason, we leave the thing in the table. | |
1253 | */ | |
1254 | sdkp->capacity = 0; | |
1255 | /* | |
1256 | * set a bogus sector size so the normal read/write | |
1257 | * logic in the block layer will eventually refuse any | |
1258 | * request on this device without tripping over power | |
1259 | * of two sector size assumptions | |
1260 | */ | |
1261 | sector_size = 512; | |
1262 | } | |
1263 | { | |
1264 | /* | |
1265 | * The msdos fs needs to know the hardware sector size | |
1266 | * So I have created this table. See ll_rw_blk.c | |
1267 | * Jacques Gelinas (Jacques@solucorp.qc.ca) | |
1268 | */ | |
1269 | int hard_sector = sector_size; | |
1270 | sector_t sz = sdkp->capacity * (hard_sector/256); | |
1271 | request_queue_t *queue = sdp->request_queue; | |
1272 | sector_t mb; | |
1273 | ||
1274 | blk_queue_hardsect_size(queue, hard_sector); | |
1275 | /* avoid 64-bit division on 32-bit platforms */ | |
1276 | mb = sz >> 1; | |
1277 | sector_div(sz, 1250); | |
1278 | mb -= sz - 974; | |
1279 | sector_div(mb, 1950); | |
1280 | ||
1281 | printk(KERN_NOTICE "SCSI device %s: " | |
1282 | "%llu %d-byte hdwr sectors (%llu MB)\n", | |
1283 | diskname, (unsigned long long)sdkp->capacity, | |
1284 | hard_sector, (unsigned long long)mb); | |
1285 | } | |
1286 | ||
1287 | /* Rescale capacity to 512-byte units */ | |
1288 | if (sector_size == 4096) | |
1289 | sdkp->capacity <<= 3; | |
1290 | else if (sector_size == 2048) | |
1291 | sdkp->capacity <<= 2; | |
1292 | else if (sector_size == 1024) | |
1293 | sdkp->capacity <<= 1; | |
1294 | else if (sector_size == 256) | |
1295 | sdkp->capacity >>= 1; | |
1296 | ||
1297 | sdkp->device->sector_size = sector_size; | |
1298 | } | |
1299 | ||
1300 | /* called with buffer of length 512 */ | |
1301 | static inline int | |
1302 | sd_do_mode_sense(struct scsi_request *SRpnt, int dbd, int modepage, | |
1303 | unsigned char *buffer, int len, struct scsi_mode_data *data) | |
1304 | { | |
1305 | return __scsi_mode_sense(SRpnt, dbd, modepage, buffer, len, | |
1306 | SD_TIMEOUT, SD_MAX_RETRIES, data); | |
1307 | } | |
1308 | ||
1309 | /* | |
1310 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
1311 | * called with buffer of length 512 | |
1312 | */ | |
1313 | static void | |
1314 | sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname, | |
1315 | struct scsi_request *SRpnt, unsigned char *buffer) { | |
1316 | int res; | |
1317 | struct scsi_mode_data data; | |
1318 | ||
1319 | set_disk_ro(sdkp->disk, 0); | |
1320 | if (sdkp->device->skip_ms_page_3f) { | |
1321 | printk(KERN_NOTICE "%s: assuming Write Enabled\n", diskname); | |
1322 | return; | |
1323 | } | |
1324 | ||
1325 | if (sdkp->device->use_192_bytes_for_3f) { | |
1326 | res = sd_do_mode_sense(SRpnt, 0, 0x3F, buffer, 192, &data); | |
1327 | } else { | |
1328 | /* | |
1329 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
1330 | * We have to start carefully: some devices hang if we ask | |
1331 | * for more than is available. | |
1332 | */ | |
1333 | res = sd_do_mode_sense(SRpnt, 0, 0x3F, buffer, 4, &data); | |
1334 | ||
1335 | /* | |
1336 | * Second attempt: ask for page 0 When only page 0 is | |
1337 | * implemented, a request for page 3F may return Sense Key | |
1338 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
1339 | * CDB. | |
1340 | */ | |
1341 | if (!scsi_status_is_good(res)) | |
1342 | res = sd_do_mode_sense(SRpnt, 0, 0, buffer, 4, &data); | |
1343 | ||
1344 | /* | |
1345 | * Third attempt: ask 255 bytes, as we did earlier. | |
1346 | */ | |
1347 | if (!scsi_status_is_good(res)) | |
1348 | res = sd_do_mode_sense(SRpnt, 0, 0x3F, buffer, 255, | |
1349 | &data); | |
1350 | } | |
1351 | ||
1352 | if (!scsi_status_is_good(res)) { | |
1353 | printk(KERN_WARNING | |
1354 | "%s: test WP failed, assume Write Enabled\n", diskname); | |
1355 | } else { | |
1356 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
1357 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
1358 | printk(KERN_NOTICE "%s: Write Protect is %s\n", diskname, | |
1359 | sdkp->write_prot ? "on" : "off"); | |
1360 | printk(KERN_DEBUG "%s: Mode Sense: %02x %02x %02x %02x\n", | |
1361 | diskname, buffer[0], buffer[1], buffer[2], buffer[3]); | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
1367 | * called with buffer of length 512 | |
1368 | */ | |
1369 | static void | |
1370 | sd_read_cache_type(struct scsi_disk *sdkp, char *diskname, | |
1371 | struct scsi_request *SRpnt, unsigned char *buffer) { | |
1372 | int len = 0, res; | |
1373 | ||
1374 | const int dbd = 0; /* DBD */ | |
1375 | const int modepage = 0x08; /* current values, cache page */ | |
1376 | struct scsi_mode_data data; | |
1377 | struct scsi_sense_hdr sshdr; | |
1378 | ||
1379 | if (sdkp->device->skip_ms_page_8) | |
1380 | goto defaults; | |
1381 | ||
1382 | /* cautiously ask */ | |
1383 | res = sd_do_mode_sense(SRpnt, dbd, modepage, buffer, 4, &data); | |
1384 | ||
1385 | if (!scsi_status_is_good(res)) | |
1386 | goto bad_sense; | |
1387 | ||
1388 | /* that went OK, now ask for the proper length */ | |
1389 | len = data.length; | |
1390 | ||
1391 | /* | |
1392 | * We're only interested in the first three bytes, actually. | |
1393 | * But the data cache page is defined for the first 20. | |
1394 | */ | |
1395 | if (len < 3) | |
1396 | goto bad_sense; | |
1397 | if (len > 20) | |
1398 | len = 20; | |
1399 | ||
1400 | /* Take headers and block descriptors into account */ | |
1401 | len += data.header_length + data.block_descriptor_length; | |
1402 | ||
1403 | /* Get the data */ | |
1404 | res = sd_do_mode_sense(SRpnt, dbd, modepage, buffer, len, &data); | |
1405 | ||
1406 | if (scsi_status_is_good(res)) { | |
1407 | const char *types[] = { | |
1408 | "write through", "none", "write back", | |
1409 | "write back, no read (daft)" | |
1410 | }; | |
1411 | int ct = 0; | |
1412 | int offset = data.header_length + | |
1413 | data.block_descriptor_length + 2; | |
1414 | ||
1415 | sdkp->WCE = ((buffer[offset] & 0x04) != 0); | |
1416 | sdkp->RCD = ((buffer[offset] & 0x01) != 0); | |
1417 | ||
1418 | ct = sdkp->RCD + 2*sdkp->WCE; | |
1419 | ||
1420 | printk(KERN_NOTICE "SCSI device %s: drive cache: %s\n", | |
1421 | diskname, types[ct]); | |
1422 | ||
1423 | return; | |
1424 | } | |
1425 | ||
1426 | bad_sense: | |
1427 | if (scsi_request_normalize_sense(SRpnt, &sshdr) && | |
1428 | sshdr.sense_key == ILLEGAL_REQUEST && | |
1429 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
1430 | printk(KERN_NOTICE "%s: cache data unavailable\n", | |
1431 | diskname); /* Invalid field in CDB */ | |
1432 | else | |
1433 | printk(KERN_ERR "%s: asking for cache data failed\n", | |
1434 | diskname); | |
1435 | ||
1436 | defaults: | |
1437 | printk(KERN_ERR "%s: assuming drive cache: write through\n", | |
1438 | diskname); | |
1439 | sdkp->WCE = 0; | |
1440 | sdkp->RCD = 0; | |
1441 | } | |
1442 | ||
1443 | /** | |
1444 | * sd_revalidate_disk - called the first time a new disk is seen, | |
1445 | * performs disk spin up, read_capacity, etc. | |
1446 | * @disk: struct gendisk we care about | |
1447 | **/ | |
1448 | static int sd_revalidate_disk(struct gendisk *disk) | |
1449 | { | |
1450 | struct scsi_disk *sdkp = scsi_disk(disk); | |
1451 | struct scsi_device *sdp = sdkp->device; | |
1452 | struct scsi_request *sreq; | |
1453 | unsigned char *buffer; | |
1454 | ||
1455 | SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name)); | |
1456 | ||
1457 | /* | |
1458 | * If the device is offline, don't try and read capacity or any | |
1459 | * of the other niceties. | |
1460 | */ | |
1461 | if (!scsi_device_online(sdp)) | |
1462 | goto out; | |
1463 | ||
1464 | sreq = scsi_allocate_request(sdp, GFP_KERNEL); | |
1465 | if (!sreq) { | |
1466 | printk(KERN_WARNING "(sd_revalidate_disk:) Request allocation " | |
1467 | "failure.\n"); | |
1468 | goto out; | |
1469 | } | |
1470 | ||
1471 | buffer = kmalloc(512, GFP_KERNEL | __GFP_DMA); | |
1472 | if (!buffer) { | |
1473 | printk(KERN_WARNING "(sd_revalidate_disk:) Memory allocation " | |
1474 | "failure.\n"); | |
1475 | goto out_release_request; | |
1476 | } | |
1477 | ||
1478 | /* defaults, until the device tells us otherwise */ | |
1479 | sdp->sector_size = 512; | |
1480 | sdkp->capacity = 0; | |
1481 | sdkp->media_present = 1; | |
1482 | sdkp->write_prot = 0; | |
1483 | sdkp->WCE = 0; | |
1484 | sdkp->RCD = 0; | |
1485 | ||
1486 | sd_spinup_disk(sdkp, disk->disk_name, sreq, buffer); | |
1487 | ||
1488 | /* | |
1489 | * Without media there is no reason to ask; moreover, some devices | |
1490 | * react badly if we do. | |
1491 | */ | |
1492 | if (sdkp->media_present) { | |
1493 | sd_read_capacity(sdkp, disk->disk_name, sreq, buffer); | |
1494 | if (sdp->removable) | |
1495 | sd_read_write_protect_flag(sdkp, disk->disk_name, | |
1496 | sreq, buffer); | |
1497 | sd_read_cache_type(sdkp, disk->disk_name, sreq, buffer); | |
1498 | } | |
1499 | ||
1500 | set_capacity(disk, sdkp->capacity); | |
1501 | kfree(buffer); | |
1502 | ||
1503 | out_release_request: | |
1504 | scsi_release_request(sreq); | |
1505 | out: | |
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | /** | |
1510 | * sd_probe - called during driver initialization and whenever a | |
1511 | * new scsi device is attached to the system. It is called once | |
1512 | * for each scsi device (not just disks) present. | |
1513 | * @dev: pointer to device object | |
1514 | * | |
1515 | * Returns 0 if successful (or not interested in this scsi device | |
1516 | * (e.g. scanner)); 1 when there is an error. | |
1517 | * | |
1518 | * Note: this function is invoked from the scsi mid-level. | |
1519 | * This function sets up the mapping between a given | |
1520 | * <host,channel,id,lun> (found in sdp) and new device name | |
1521 | * (e.g. /dev/sda). More precisely it is the block device major | |
1522 | * and minor number that is chosen here. | |
1523 | * | |
1524 | * Assume sd_attach is not re-entrant (for time being) | |
1525 | * Also think about sd_attach() and sd_remove() running coincidentally. | |
1526 | **/ | |
1527 | static int sd_probe(struct device *dev) | |
1528 | { | |
1529 | struct scsi_device *sdp = to_scsi_device(dev); | |
1530 | struct scsi_disk *sdkp; | |
1531 | struct gendisk *gd; | |
1532 | u32 index; | |
1533 | int error; | |
1534 | ||
1535 | error = -ENODEV; | |
1536 | if ((sdp->type != TYPE_DISK) && (sdp->type != TYPE_MOD)) | |
1537 | goto out; | |
1538 | ||
1539 | SCSI_LOG_HLQUEUE(3, printk("sd_attach: scsi device: <%d,%d,%d,%d>\n", | |
1540 | sdp->host->host_no, sdp->channel, sdp->id, sdp->lun)); | |
1541 | ||
1542 | error = -ENOMEM; | |
1543 | sdkp = kmalloc(sizeof(*sdkp), GFP_KERNEL); | |
1544 | if (!sdkp) | |
1545 | goto out; | |
1546 | ||
1547 | memset (sdkp, 0, sizeof(*sdkp)); | |
1548 | kref_init(&sdkp->kref); | |
1549 | ||
1550 | gd = alloc_disk(16); | |
1551 | if (!gd) | |
1552 | goto out_free; | |
1553 | ||
1554 | if (!idr_pre_get(&sd_index_idr, GFP_KERNEL)) | |
1555 | goto out_put; | |
1556 | ||
1557 | spin_lock(&sd_index_lock); | |
1558 | error = idr_get_new(&sd_index_idr, NULL, &index); | |
1559 | spin_unlock(&sd_index_lock); | |
1560 | ||
1561 | if (index >= SD_MAX_DISKS) | |
1562 | error = -EBUSY; | |
1563 | if (error) | |
1564 | goto out_put; | |
1565 | ||
1566 | sdkp->device = sdp; | |
1567 | sdkp->driver = &sd_template; | |
1568 | sdkp->disk = gd; | |
1569 | sdkp->index = index; | |
1570 | sdkp->openers = 0; | |
1571 | ||
1572 | if (!sdp->timeout) { | |
1573 | if (sdp->type == TYPE_DISK) | |
1574 | sdp->timeout = SD_TIMEOUT; | |
1575 | else | |
1576 | sdp->timeout = SD_MOD_TIMEOUT; | |
1577 | } | |
1578 | ||
1579 | gd->major = sd_major((index & 0xf0) >> 4); | |
1580 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
1581 | gd->minors = 16; | |
1582 | gd->fops = &sd_fops; | |
1583 | ||
1584 | if (index < 26) { | |
1585 | sprintf(gd->disk_name, "sd%c", 'a' + index % 26); | |
1586 | } else if (index < (26 + 1) * 26) { | |
1587 | sprintf(gd->disk_name, "sd%c%c", | |
1588 | 'a' + index / 26 - 1,'a' + index % 26); | |
1589 | } else { | |
1590 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
1591 | const unsigned int m2 = (index / 26 - 1) % 26; | |
1592 | const unsigned int m3 = index % 26; | |
1593 | sprintf(gd->disk_name, "sd%c%c%c", | |
1594 | 'a' + m1, 'a' + m2, 'a' + m3); | |
1595 | } | |
1596 | ||
1597 | strcpy(gd->devfs_name, sdp->devfs_name); | |
1598 | ||
1599 | gd->private_data = &sdkp->driver; | |
1600 | ||
1601 | sd_revalidate_disk(gd); | |
1602 | ||
1603 | gd->driverfs_dev = &sdp->sdev_gendev; | |
1604 | gd->flags = GENHD_FL_DRIVERFS; | |
1605 | if (sdp->removable) | |
1606 | gd->flags |= GENHD_FL_REMOVABLE; | |
1607 | gd->queue = sdkp->device->request_queue; | |
1608 | ||
1609 | dev_set_drvdata(dev, sdkp); | |
1610 | add_disk(gd); | |
1611 | ||
1612 | printk(KERN_NOTICE "Attached scsi %sdisk %s at scsi%d, channel %d, " | |
1613 | "id %d, lun %d\n", sdp->removable ? "removable " : "", | |
1614 | gd->disk_name, sdp->host->host_no, sdp->channel, | |
1615 | sdp->id, sdp->lun); | |
1616 | ||
1617 | return 0; | |
1618 | ||
1619 | out_put: | |
1620 | put_disk(gd); | |
1621 | out_free: | |
1622 | kfree(sdkp); | |
1623 | out: | |
1624 | return error; | |
1625 | } | |
1626 | ||
1627 | /** | |
1628 | * sd_remove - called whenever a scsi disk (previously recognized by | |
1629 | * sd_probe) is detached from the system. It is called (potentially | |
1630 | * multiple times) during sd module unload. | |
1631 | * @sdp: pointer to mid level scsi device object | |
1632 | * | |
1633 | * Note: this function is invoked from the scsi mid-level. | |
1634 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
1635 | * that could be re-used by a subsequent sd_probe(). | |
1636 | * This function is not called when the built-in sd driver is "exit-ed". | |
1637 | **/ | |
1638 | static int sd_remove(struct device *dev) | |
1639 | { | |
1640 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
1641 | ||
1642 | del_gendisk(sdkp->disk); | |
1643 | sd_shutdown(dev); | |
1644 | down(&sd_ref_sem); | |
1645 | kref_put(&sdkp->kref, scsi_disk_release); | |
1646 | up(&sd_ref_sem); | |
1647 | ||
1648 | return 0; | |
1649 | } | |
1650 | ||
1651 | /** | |
1652 | * scsi_disk_release - Called to free the scsi_disk structure | |
1653 | * @kref: pointer to embedded kref | |
1654 | * | |
1655 | * sd_ref_sem must be held entering this routine. Because it is | |
1656 | * called on last put, you should always use the scsi_disk_get() | |
1657 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
1658 | * and never do a direct kref_put(). | |
1659 | **/ | |
1660 | static void scsi_disk_release(struct kref *kref) | |
1661 | { | |
1662 | struct scsi_disk *sdkp = to_scsi_disk(kref); | |
1663 | struct gendisk *disk = sdkp->disk; | |
1664 | ||
1665 | spin_lock(&sd_index_lock); | |
1666 | idr_remove(&sd_index_idr, sdkp->index); | |
1667 | spin_unlock(&sd_index_lock); | |
1668 | ||
1669 | disk->private_data = NULL; | |
1670 | ||
1671 | put_disk(disk); | |
1672 | ||
1673 | kfree(sdkp); | |
1674 | } | |
1675 | ||
1676 | /* | |
1677 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
1678 | * the normal SCSI command structure. Wait for the command to | |
1679 | * complete. | |
1680 | */ | |
1681 | static void sd_shutdown(struct device *dev) | |
1682 | { | |
1683 | struct scsi_device *sdp = to_scsi_device(dev); | |
1684 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
1685 | ||
1686 | if (!sdkp) | |
1687 | return; /* this can happen */ | |
1688 | ||
1689 | if (!sdkp->WCE) | |
1690 | return; | |
1691 | ||
1692 | printk(KERN_NOTICE "Synchronizing SCSI cache for disk %s: \n", | |
1693 | sdkp->disk->disk_name); | |
1694 | sd_sync_cache(sdp); | |
1695 | } | |
1696 | ||
1697 | /** | |
1698 | * init_sd - entry point for this driver (both when built in or when | |
1699 | * a module). | |
1700 | * | |
1701 | * Note: this function registers this driver with the scsi mid-level. | |
1702 | **/ | |
1703 | static int __init init_sd(void) | |
1704 | { | |
1705 | int majors = 0, i; | |
1706 | ||
1707 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
1708 | ||
1709 | for (i = 0; i < SD_MAJORS; i++) | |
1710 | if (register_blkdev(sd_major(i), "sd") == 0) | |
1711 | majors++; | |
1712 | ||
1713 | if (!majors) | |
1714 | return -ENODEV; | |
1715 | ||
1716 | return scsi_register_driver(&sd_template.gendrv); | |
1717 | } | |
1718 | ||
1719 | /** | |
1720 | * exit_sd - exit point for this driver (when it is a module). | |
1721 | * | |
1722 | * Note: this function unregisters this driver from the scsi mid-level. | |
1723 | **/ | |
1724 | static void __exit exit_sd(void) | |
1725 | { | |
1726 | int i; | |
1727 | ||
1728 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
1729 | ||
1730 | scsi_unregister_driver(&sd_template.gendrv); | |
1731 | for (i = 0; i < SD_MAJORS; i++) | |
1732 | unregister_blkdev(sd_major(i), "sd"); | |
1733 | } | |
1734 | ||
1735 | MODULE_LICENSE("GPL"); | |
1736 | MODULE_AUTHOR("Eric Youngdale"); | |
1737 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); | |
1738 | ||
1739 | module_init(init_sd); | |
1740 | module_exit(exit_sd); |