blob: 36e930066649127249937b08a59a96f1f348574b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Changes:
3 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 08/23/2000
4 * - get rid of some verify_areas and use __copy*user and __get/put_user
5 * for the ones that remain
6 */
7#include <linux/module.h>
8#include <linux/blkdev.h>
9#include <linux/interrupt.h>
10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/mm.h>
14#include <linux/string.h>
15#include <asm/uaccess.h>
16
17#include <scsi/scsi.h>
18#include <scsi/scsi_device.h>
19#include <scsi/scsi_eh.h>
20#include <scsi/scsi_host.h>
21#include <scsi/scsi_ioctl.h>
22#include <scsi/scsi_request.h>
23#include <scsi/sg.h>
24#include <scsi/scsi_dbg.h>
25
26#include "scsi_logging.h"
27
28#define NORMAL_RETRIES 5
29#define IOCTL_NORMAL_TIMEOUT (10 * HZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31#define MAX_BUF PAGE_SIZE
32
Christoph Hellwig32993522005-09-06 14:03:44 +020033/**
34 * ioctl_probe -- return host identification
35 * @host: host to identify
36 * @buffer: userspace buffer for identification
37 *
38 * Return an identifying string at @buffer, if @buffer is non-NULL, filling
39 * to the length stored at * (int *) @buffer.
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070041static int ioctl_probe(struct Scsi_Host *host, void __user *buffer)
42{
43 unsigned int len, slen;
44 const char *string;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Christoph Hellwig32993522005-09-06 14:03:44 +020046 if (buffer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 if (get_user(len, (unsigned int __user *) buffer))
48 return -EFAULT;
49
50 if (host->hostt->info)
51 string = host->hostt->info(host);
52 else
53 string = host->hostt->name;
54 if (string) {
55 slen = strlen(string);
56 if (len > slen)
57 len = slen + 1;
58 if (copy_to_user(buffer, string, len))
59 return -EFAULT;
60 }
61 }
Christoph Hellwig32993522005-09-06 14:03:44 +020062 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063}
64
65/*
66
67 * The SCSI_IOCTL_SEND_COMMAND ioctl sends a command out to the SCSI host.
68 * The IOCTL_NORMAL_TIMEOUT and NORMAL_RETRIES variables are used.
69 *
70 * dev is the SCSI device struct ptr, *(int *) arg is the length of the
71 * input data, if any, not including the command string & counts,
72 * *((int *)arg + 1) is the output buffer size in bytes.
73 *
74 * *(char *) ((int *) arg)[2] the actual command byte.
75 *
76 * Note that if more than MAX_BUF bytes are requested to be transferred,
77 * the ioctl will fail with error EINVAL.
78 *
79 * This size *does not* include the initial lengths that were passed.
80 *
81 * The SCSI command is read from the memory location immediately after the
82 * length words, and the input data is right after the command. The SCSI
83 * routines know the command size based on the opcode decode.
84 *
85 * The output area is then filled in starting from the command byte.
86 */
87
88static int ioctl_internal_command(struct scsi_device *sdev, char *cmd,
89 int timeout, int retries)
90{
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 int result;
92 struct scsi_sense_hdr sshdr;
93
94 SCSI_LOG_IOCTL(1, printk("Trying ioctl with scsi command %d\n", *cmd));
95
James Bottomley1cf72692005-08-28 11:27:01 -050096 result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0,
James Bottomleyea73a9f2005-08-28 11:33:52 -050097 &sshdr, timeout, retries);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
James Bottomley1cf72692005-08-28 11:27:01 -050099 SCSI_LOG_IOCTL(2, printk("Ioctl returned 0x%x\n", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
James Bottomley1cf72692005-08-28 11:27:01 -0500101 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500102 (scsi_sense_valid(&sshdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 switch (sshdr.sense_key) {
104 case ILLEGAL_REQUEST:
105 if (cmd[0] == ALLOW_MEDIUM_REMOVAL)
106 sdev->lockable = 0;
107 else
108 printk(KERN_INFO "ioctl_internal_command: "
109 "ILLEGAL REQUEST asc=0x%x ascq=0x%x\n",
110 sshdr.asc, sshdr.ascq);
111 break;
112 case NOT_READY: /* This happens if there is no disc in drive */
113 if (sdev->removable && (cmd[0] != TEST_UNIT_READY)) {
114 printk(KERN_INFO "Device not ready. Make sure"
115 " there is a disc in the drive.\n");
116 break;
117 }
118 case UNIT_ATTENTION:
119 if (sdev->removable) {
120 sdev->changed = 1;
James Bottomley1cf72692005-08-28 11:27:01 -0500121 result = 0; /* This is no longer considered an error */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 break;
123 }
124 default: /* Fall through for non-removable media */
James Bottomley9ccfc752005-10-02 11:45:08 -0500125 sdev_printk(KERN_INFO, sdev,
126 "ioctl_internal_command return code = %x\n",
127 result);
James Bottomleyea73a9f2005-08-28 11:33:52 -0500128 scsi_print_sense_hdr(" ", &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 break;
130 }
131 }
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 SCSI_LOG_IOCTL(2, printk("IOCTL Releasing command\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 return result;
135}
136
137int scsi_set_medium_removal(struct scsi_device *sdev, char state)
138{
139 char scsi_cmd[MAX_COMMAND_SIZE];
140 int ret;
141
142 if (!sdev->removable || !sdev->lockable)
143 return 0;
144
145 scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL;
146 scsi_cmd[1] = 0;
147 scsi_cmd[2] = 0;
148 scsi_cmd[3] = 0;
149 scsi_cmd[4] = state;
150 scsi_cmd[5] = 0;
151
152 ret = ioctl_internal_command(sdev, scsi_cmd,
153 IOCTL_NORMAL_TIMEOUT, NORMAL_RETRIES);
154 if (ret == 0)
155 sdev->locked = (state == SCSI_REMOVAL_PREVENT);
156 return ret;
157}
158EXPORT_SYMBOL(scsi_set_medium_removal);
159
160/*
161 * This interface is deprecated - users should use the scsi generic (sg)
162 * interface instead, as this is a more flexible approach to performing
163 * generic SCSI commands on a device.
164 *
165 * The structure that we are passed should look like:
166 *
167 * struct sdata {
168 * unsigned int inlen; [i] Length of data to be written to device
169 * unsigned int outlen; [i] Length of data to be read from device
170 * unsigned char cmd[x]; [i] SCSI command (6 <= x <= 12).
171 * [o] Data read from device starts here.
172 * [o] On error, sense buffer starts here.
173 * unsigned char wdata[y]; [i] Data written to device starts here.
174 * };
175 * Notes:
176 * - The SCSI command length is determined by examining the 1st byte
177 * of the given command. There is no way to override this.
178 * - Data transfers are limited to PAGE_SIZE (4K on i386, 8K on alpha).
179 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
180 * accommodate the sense buffer when an error occurs.
181 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
182 * old code will not be surprised.
183 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
184 * a negative return and the Unix error code in 'errno'.
185 * If the SCSI command succeeds then 0 is returned.
186 * Positive numbers returned are the compacted SCSI error codes (4
187 * bytes in one int) where the lowest byte is the SCSI status.
188 * See the drivers/scsi/scsi.h file for more information on this.
189 *
190 */
191#define OMAX_SB_LEN 16 /* Old sense buffer length */
192
193int scsi_ioctl_send_command(struct scsi_device *sdev,
194 struct scsi_ioctl_command __user *sic)
195{
196 char *buf;
197 unsigned char cmd[MAX_COMMAND_SIZE];
James Bottomley1cf72692005-08-28 11:27:01 -0500198 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 char __user *cmd_in;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 unsigned char opcode;
201 unsigned int inlen, outlen, cmdlen;
202 unsigned int needed, buf_needed;
203 int timeout, retries, result;
Al Viroc53033f2005-10-21 03:22:08 -0400204 int data_direction;
205 gfp_t gfp_mask = GFP_KERNEL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207 if (!sic)
208 return -EINVAL;
209
210 if (sdev->host->unchecked_isa_dma)
211 gfp_mask |= GFP_DMA;
212
213 /*
214 * Verify that we can read at least this much.
215 */
216 if (!access_ok(VERIFY_READ, sic, sizeof(Scsi_Ioctl_Command)))
217 return -EFAULT;
218
219 if(__get_user(inlen, &sic->inlen))
220 return -EFAULT;
221
222 if(__get_user(outlen, &sic->outlen))
223 return -EFAULT;
224
225 /*
226 * We do not transfer more than MAX_BUF with this interface.
227 * If the user needs to transfer more data than this, they
228 * should use scsi_generics (sg) instead.
229 */
230 if (inlen > MAX_BUF)
231 return -EINVAL;
232 if (outlen > MAX_BUF)
233 return -EINVAL;
234
235 cmd_in = sic->data;
236 if(get_user(opcode, cmd_in))
237 return -EFAULT;
238
239 needed = buf_needed = (inlen > outlen ? inlen : outlen);
240 if (buf_needed) {
241 buf_needed = (buf_needed + 511) & ~511;
242 if (buf_needed > MAX_BUF)
243 buf_needed = MAX_BUF;
Jes Sorensen24669f752006-01-16 10:31:18 -0500244 buf = kzalloc(buf_needed, gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 if (!buf)
246 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if (inlen == 0) {
248 data_direction = DMA_FROM_DEVICE;
249 } else if (outlen == 0 ) {
250 data_direction = DMA_TO_DEVICE;
251 } else {
252 /*
253 * Can this ever happen?
254 */
255 data_direction = DMA_BIDIRECTIONAL;
256 }
257
258 } else {
259 buf = NULL;
260 data_direction = DMA_NONE;
261 }
262
263 /*
264 * Obtain the command from the user's address space.
265 */
266 cmdlen = COMMAND_SIZE(opcode);
267
268 result = -EFAULT;
269
270 if (!access_ok(VERIFY_READ, cmd_in, cmdlen + inlen))
271 goto error;
272
273 if(__copy_from_user(cmd, cmd_in, cmdlen))
274 goto error;
275
276 /*
277 * Obtain the data to be sent to the device (if any).
278 */
279
Jayachandran C46477222005-10-27 15:51:13 -0700280 if(inlen && copy_from_user(buf, cmd_in + cmdlen, inlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 goto error;
282
283 switch (opcode) {
284 case SEND_DIAGNOSTIC:
285 case FORMAT_UNIT:
286 timeout = FORMAT_UNIT_TIMEOUT;
287 retries = 1;
288 break;
289 case START_STOP:
290 timeout = START_STOP_TIMEOUT;
291 retries = NORMAL_RETRIES;
292 break;
293 case MOVE_MEDIUM:
294 timeout = MOVE_MEDIUM_TIMEOUT;
295 retries = NORMAL_RETRIES;
296 break;
297 case READ_ELEMENT_STATUS:
298 timeout = READ_ELEMENT_STATUS_TIMEOUT;
299 retries = NORMAL_RETRIES;
300 break;
301 case READ_DEFECT_DATA:
302 timeout = READ_DEFECT_DATA_TIMEOUT;
303 retries = 1;
304 break;
305 default:
306 timeout = IOCTL_NORMAL_TIMEOUT;
307 retries = NORMAL_RETRIES;
308 break;
309 }
310
James Bottomleyea73a9f2005-08-28 11:33:52 -0500311 result = scsi_execute(sdev, cmd, data_direction, buf, needed,
312 sense, timeout, retries, 0);
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 /*
315 * If there was an error condition, pass the info back to the user.
316 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 if (result) {
James Bottomley1cf72692005-08-28 11:27:01 -0500318 int sb_len = sizeof(*sense);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320 sb_len = (sb_len > OMAX_SB_LEN) ? OMAX_SB_LEN : sb_len;
James Bottomley1cf72692005-08-28 11:27:01 -0500321 if (copy_to_user(cmd_in, sense, sb_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 result = -EFAULT;
323 } else {
Jayachandran C46477222005-10-27 15:51:13 -0700324 if (outlen && copy_to_user(cmd_in, buf, outlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 result = -EFAULT;
326 }
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328error:
329 kfree(buf);
330 return result;
331}
332EXPORT_SYMBOL(scsi_ioctl_send_command);
333
334/*
335 * The scsi_ioctl_get_pci() function places into arg the value
336 * pci_dev::slot_name (8 characters) for the PCI device (if any).
337 * Returns: 0 on success
338 * -ENXIO if there isn't a PCI device pointer
339 * (could be because the SCSI driver hasn't been
340 * updated yet, or because it isn't a SCSI
341 * device)
342 * any copy_to_user() error on failure there
343 */
344static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg)
345{
346 struct device *dev = scsi_get_device(sdev->host);
347
348 if (!dev)
349 return -ENXIO;
350 return copy_to_user(arg, dev->bus_id, sizeof(dev->bus_id))? -EFAULT: 0;
351}
352
353
354/*
355 * the scsi_ioctl() function differs from most ioctls in that it does
356 * not take a major/minor number as the dev field. Rather, it takes
357 * a pointer to a scsi_devices[] element, a structure.
358 */
359int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
360{
361 char scsi_cmd[MAX_COMMAND_SIZE];
362
363 /* No idea how this happens.... */
364 if (!sdev)
365 return -ENXIO;
366
367 /*
368 * If we are in the middle of error recovery, don't let anyone
369 * else try and use this device. Also, if error recovery fails, it
370 * may try and take the device offline, in which case all further
371 * access to the device is prohibited.
372 */
373 if (!scsi_block_when_processing_errors(sdev))
374 return -ENODEV;
375
376 /* Check for deprecated ioctls ... all the ioctls which don't
377 * follow the new unique numbering scheme are deprecated */
378 switch (cmd) {
379 case SCSI_IOCTL_SEND_COMMAND:
380 case SCSI_IOCTL_TEST_UNIT_READY:
381 case SCSI_IOCTL_BENCHMARK_COMMAND:
382 case SCSI_IOCTL_SYNC:
383 case SCSI_IOCTL_START_UNIT:
384 case SCSI_IOCTL_STOP_UNIT:
385 printk(KERN_WARNING "program %s is using a deprecated SCSI "
386 "ioctl, please convert it to SG_IO\n", current->comm);
387 break;
388 default:
389 break;
390 }
391
392 switch (cmd) {
393 case SCSI_IOCTL_GET_IDLUN:
394 if (!access_ok(VERIFY_WRITE, arg, sizeof(struct scsi_idlun)))
395 return -EFAULT;
396
397 __put_user((sdev->id & 0xff)
398 + ((sdev->lun & 0xff) << 8)
399 + ((sdev->channel & 0xff) << 16)
400 + ((sdev->host->host_no & 0xff) << 24),
401 &((struct scsi_idlun __user *)arg)->dev_id);
402 __put_user(sdev->host->unique_id,
403 &((struct scsi_idlun __user *)arg)->host_unique_id);
404 return 0;
405 case SCSI_IOCTL_GET_BUS_NUMBER:
406 return put_user(sdev->host->host_no, (int __user *)arg);
407 case SCSI_IOCTL_PROBE_HOST:
408 return ioctl_probe(sdev->host, arg);
409 case SCSI_IOCTL_SEND_COMMAND:
410 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
411 return -EACCES;
412 return scsi_ioctl_send_command(sdev, arg);
413 case SCSI_IOCTL_DOORLOCK:
414 return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
415 case SCSI_IOCTL_DOORUNLOCK:
416 return scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
417 case SCSI_IOCTL_TEST_UNIT_READY:
418 return scsi_test_unit_ready(sdev, IOCTL_NORMAL_TIMEOUT,
419 NORMAL_RETRIES);
420 case SCSI_IOCTL_START_UNIT:
421 scsi_cmd[0] = START_STOP;
422 scsi_cmd[1] = 0;
423 scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
424 scsi_cmd[4] = 1;
425 return ioctl_internal_command(sdev, scsi_cmd,
426 START_STOP_TIMEOUT, NORMAL_RETRIES);
427 case SCSI_IOCTL_STOP_UNIT:
428 scsi_cmd[0] = START_STOP;
429 scsi_cmd[1] = 0;
430 scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
431 scsi_cmd[4] = 0;
432 return ioctl_internal_command(sdev, scsi_cmd,
433 START_STOP_TIMEOUT, NORMAL_RETRIES);
434 case SCSI_IOCTL_GET_PCI:
435 return scsi_ioctl_get_pci(sdev, arg);
436 default:
437 if (sdev->host->hostt->ioctl)
438 return sdev->host->hostt->ioctl(sdev, cmd, arg);
439 }
440 return -EINVAL;
441}
442EXPORT_SYMBOL(scsi_ioctl);
443
444/*
445 * the scsi_nonblock_ioctl() function is designed for ioctls which may
446 * be executed even if the device is in recovery.
447 */
448int scsi_nonblockable_ioctl(struct scsi_device *sdev, int cmd,
449 void __user *arg, struct file *filp)
450{
451 int val, result;
452
453 /* The first set of iocts may be executed even if we're doing
454 * error processing, as long as the device was opened
455 * non-blocking */
456 if (filp && filp->f_flags & O_NONBLOCK) {
James Bottomley939647e2005-09-18 15:05:20 -0500457 if (scsi_host_in_recovery(sdev->host))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 return -ENODEV;
459 } else if (!scsi_block_when_processing_errors(sdev))
460 return -ENODEV;
461
462 switch (cmd) {
463 case SG_SCSI_RESET:
464 result = get_user(val, (int __user *)arg);
465 if (result)
466 return result;
467 if (val == SG_SCSI_RESET_NOTHING)
468 return 0;
469 switch (val) {
470 case SG_SCSI_RESET_DEVICE:
471 val = SCSI_TRY_RESET_DEVICE;
472 break;
473 case SG_SCSI_RESET_BUS:
474 val = SCSI_TRY_RESET_BUS;
475 break;
476 case SG_SCSI_RESET_HOST:
477 val = SCSI_TRY_RESET_HOST;
478 break;
479 default:
480 return -EINVAL;
481 }
482 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
483 return -EACCES;
484 return (scsi_reset_provider(sdev, val) ==
485 SUCCESS) ? 0 : -EIO;
486 }
487 return -ENODEV;
488}
489EXPORT_SYMBOL(scsi_nonblockable_ioctl);