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scsi: use 64-bit value for 'max_luns'
[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / sg.c
1 /*
2 * History:
3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
4 * to allow user process control of SCSI devices.
5 * Development Sponsored by Killy Corp. NY NY
6 *
7 * Original driver (sg.c):
8 * Copyright (C) 1992 Lawrence Foard
9 * Version 2 and 3 extensions to driver:
10 * Copyright (C) 1998 - 2014 Douglas Gilbert
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 */
18
19 static int sg_version_num = 30536; /* 2 digits for each component */
20 #define SG_VERSION_STR "3.5.36"
21
22 /*
23 * D. P. Gilbert (dgilbert@interlog.com), notes:
24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
26 * (otherwise the macros compile to empty statements).
27 *
28 */
29 #include <linux/module.h>
30
31 #include <linux/fs.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/string.h>
35 #include <linux/mm.h>
36 #include <linux/aio.h>
37 #include <linux/errno.h>
38 #include <linux/mtio.h>
39 #include <linux/ioctl.h>
40 #include <linux/slab.h>
41 #include <linux/fcntl.h>
42 #include <linux/init.h>
43 #include <linux/poll.h>
44 #include <linux/moduleparam.h>
45 #include <linux/cdev.h>
46 #include <linux/idr.h>
47 #include <linux/seq_file.h>
48 #include <linux/blkdev.h>
49 #include <linux/delay.h>
50 #include <linux/blktrace_api.h>
51 #include <linux/mutex.h>
52 #include <linux/atomic.h>
53 #include <linux/ratelimit.h>
54
55 #include "scsi.h"
56 #include <scsi/scsi_dbg.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_driver.h>
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/sg.h>
61
62 #include "scsi_logging.h"
63
64 #ifdef CONFIG_SCSI_PROC_FS
65 #include <linux/proc_fs.h>
66 static char *sg_version_date = "20140603";
67
68 static int sg_proc_init(void);
69 static void sg_proc_cleanup(void);
70 #endif
71
72 #define SG_ALLOW_DIO_DEF 0
73
74 #define SG_MAX_DEVS 32768
75
76 /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type
77 * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater
78 * than 16 bytes are "variable length" whose length is a multiple of 4
79 */
80 #define SG_MAX_CDB_SIZE 252
81
82 /*
83 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
84 * Then when using 32 bit integers x * m may overflow during the calculation.
85 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
86 * calculates the same, but prevents the overflow when both m and d
87 * are "small" numbers (like HZ and USER_HZ).
88 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
89 * in 32 bits.
90 */
91 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
92
93 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
94
95 int sg_big_buff = SG_DEF_RESERVED_SIZE;
96 /* N.B. This variable is readable and writeable via
97 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
98 of this size (or less if there is not enough memory) will be reserved
99 for use by this file descriptor. [Deprecated usage: this variable is also
100 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
101 the kernel (i.e. it is not a module).] */
102 static int def_reserved_size = -1; /* picks up init parameter */
103 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
104
105 static int scatter_elem_sz = SG_SCATTER_SZ;
106 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
107
108 #define SG_SECTOR_SZ 512
109
110 static int sg_add_device(struct device *, struct class_interface *);
111 static void sg_remove_device(struct device *, struct class_interface *);
112
113 static DEFINE_IDR(sg_index_idr);
114 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
115 file descriptor list for device */
116
117 static struct class_interface sg_interface = {
118 .add_dev = sg_add_device,
119 .remove_dev = sg_remove_device,
120 };
121
122 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
123 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
124 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
125 unsigned bufflen; /* Size of (aggregate) data buffer */
126 struct page **pages;
127 int page_order;
128 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
129 unsigned char cmd_opcode; /* first byte of command */
130 } Sg_scatter_hold;
131
132 struct sg_device; /* forward declarations */
133 struct sg_fd;
134
135 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
136 struct sg_request *nextrp; /* NULL -> tail request (slist) */
137 struct sg_fd *parentfp; /* NULL -> not in use */
138 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
139 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
140 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
141 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
142 char orphan; /* 1 -> drop on sight, 0 -> normal */
143 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
144 /* done protected by rq_list_lock */
145 char done; /* 0->before bh, 1->before read, 2->read */
146 struct request *rq;
147 struct bio *bio;
148 struct execute_work ew;
149 } Sg_request;
150
151 typedef struct sg_fd { /* holds the state of a file descriptor */
152 struct list_head sfd_siblings; /* protected by device's sfd_lock */
153 struct sg_device *parentdp; /* owning device */
154 wait_queue_head_t read_wait; /* queue read until command done */
155 rwlock_t rq_list_lock; /* protect access to list in req_arr */
156 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
157 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
158 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
159 unsigned save_scat_len; /* original length of trunc. scat. element */
160 Sg_request *headrp; /* head of request slist, NULL->empty */
161 struct fasync_struct *async_qp; /* used by asynchronous notification */
162 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
163 char low_dma; /* as in parent but possibly overridden to 1 */
164 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
165 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
166 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */
167 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
168 char mmap_called; /* 0 -> mmap() never called on this fd */
169 struct kref f_ref;
170 struct execute_work ew;
171 } Sg_fd;
172
173 typedef struct sg_device { /* holds the state of each scsi generic device */
174 struct scsi_device *device;
175 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */
176 struct mutex open_rel_lock; /* held when in open() or release() */
177 int sg_tablesize; /* adapter's max scatter-gather table size */
178 u32 index; /* device index number */
179 struct list_head sfds;
180 rwlock_t sfd_lock; /* protect access to sfd list */
181 atomic_t detaching; /* 0->device usable, 1->device detaching */
182 bool exclude; /* 1->open(O_EXCL) succeeded and is active */
183 int open_cnt; /* count of opens (perhaps < num(sfds) ) */
184 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
185 struct gendisk *disk;
186 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
187 struct kref d_ref;
188 } Sg_device;
189
190 /* tasklet or soft irq callback */
191 static void sg_rq_end_io(struct request *rq, int uptodate);
192 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
193 static int sg_finish_rem_req(Sg_request * srp);
194 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
195 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
196 Sg_request * srp);
197 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
198 const char __user *buf, size_t count, int blocking,
199 int read_only, int sg_io_owned, Sg_request **o_srp);
200 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
201 unsigned char *cmnd, int timeout, int blocking);
202 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
203 static void sg_remove_scat(Sg_scatter_hold * schp);
204 static void sg_build_reserve(Sg_fd * sfp, int req_size);
205 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
206 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
207 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
208 static void sg_remove_sfp(struct kref *);
209 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
210 static Sg_request *sg_add_request(Sg_fd * sfp);
211 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
212 static int sg_res_in_use(Sg_fd * sfp);
213 static Sg_device *sg_get_dev(int dev);
214 static void sg_device_destroy(struct kref *kref);
215
216 #define SZ_SG_HEADER sizeof(struct sg_header)
217 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
218 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
219 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
220
221 static int sg_allow_access(struct file *filp, unsigned char *cmd)
222 {
223 struct sg_fd *sfp = filp->private_data;
224
225 if (sfp->parentdp->device->type == TYPE_SCANNER)
226 return 0;
227
228 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
229 }
230
231 static int
232 open_wait(Sg_device *sdp, int flags)
233 {
234 int retval = 0;
235
236 if (flags & O_EXCL) {
237 while (sdp->open_cnt > 0) {
238 mutex_unlock(&sdp->open_rel_lock);
239 retval = wait_event_interruptible(sdp->open_wait,
240 (atomic_read(&sdp->detaching) ||
241 !sdp->open_cnt));
242 mutex_lock(&sdp->open_rel_lock);
243
244 if (retval) /* -ERESTARTSYS */
245 return retval;
246 if (atomic_read(&sdp->detaching))
247 return -ENODEV;
248 }
249 } else {
250 while (sdp->exclude) {
251 mutex_unlock(&sdp->open_rel_lock);
252 retval = wait_event_interruptible(sdp->open_wait,
253 (atomic_read(&sdp->detaching) ||
254 !sdp->exclude));
255 mutex_lock(&sdp->open_rel_lock);
256
257 if (retval) /* -ERESTARTSYS */
258 return retval;
259 if (atomic_read(&sdp->detaching))
260 return -ENODEV;
261 }
262 }
263
264 return retval;
265 }
266
267 /* Returns 0 on success, else a negated errno value */
268 static int
269 sg_open(struct inode *inode, struct file *filp)
270 {
271 int dev = iminor(inode);
272 int flags = filp->f_flags;
273 struct request_queue *q;
274 Sg_device *sdp;
275 Sg_fd *sfp;
276 int retval;
277
278 nonseekable_open(inode, filp);
279 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
280 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
281 return -EPERM; /* Can't lock it with read only access */
282 sdp = sg_get_dev(dev);
283 if (IS_ERR(sdp))
284 return PTR_ERR(sdp);
285
286 /* This driver's module count bumped by fops_get in <linux/fs.h> */
287 /* Prevent the device driver from vanishing while we sleep */
288 retval = scsi_device_get(sdp->device);
289 if (retval)
290 goto sg_put;
291
292 retval = scsi_autopm_get_device(sdp->device);
293 if (retval)
294 goto sdp_put;
295
296 /* scsi_block_when_processing_errors() may block so bypass
297 * check if O_NONBLOCK. Permits SCSI commands to be issued
298 * during error recovery. Tread carefully. */
299 if (!((flags & O_NONBLOCK) ||
300 scsi_block_when_processing_errors(sdp->device))) {
301 retval = -ENXIO;
302 /* we are in error recovery for this device */
303 goto error_out;
304 }
305
306 mutex_lock(&sdp->open_rel_lock);
307 if (flags & O_NONBLOCK) {
308 if (flags & O_EXCL) {
309 if (sdp->open_cnt > 0) {
310 retval = -EBUSY;
311 goto error_mutex_locked;
312 }
313 } else {
314 if (sdp->exclude) {
315 retval = -EBUSY;
316 goto error_mutex_locked;
317 }
318 }
319 } else {
320 retval = open_wait(sdp, flags);
321 if (retval) /* -ERESTARTSYS or -ENODEV */
322 goto error_mutex_locked;
323 }
324
325 /* N.B. at this point we are holding the open_rel_lock */
326 if (flags & O_EXCL)
327 sdp->exclude = true;
328
329 if (sdp->open_cnt < 1) { /* no existing opens */
330 sdp->sgdebug = 0;
331 q = sdp->device->request_queue;
332 sdp->sg_tablesize = queue_max_segments(q);
333 }
334 sfp = sg_add_sfp(sdp, dev);
335 if (IS_ERR(sfp)) {
336 retval = PTR_ERR(sfp);
337 goto out_undo;
338 }
339
340 filp->private_data = sfp;
341 sdp->open_cnt++;
342 mutex_unlock(&sdp->open_rel_lock);
343
344 retval = 0;
345 sg_put:
346 kref_put(&sdp->d_ref, sg_device_destroy);
347 return retval;
348
349 out_undo:
350 if (flags & O_EXCL) {
351 sdp->exclude = false; /* undo if error */
352 wake_up_interruptible(&sdp->open_wait);
353 }
354 error_mutex_locked:
355 mutex_unlock(&sdp->open_rel_lock);
356 error_out:
357 scsi_autopm_put_device(sdp->device);
358 sdp_put:
359 scsi_device_put(sdp->device);
360 goto sg_put;
361 }
362
363 /* Release resources associated with a successful sg_open()
364 * Returns 0 on success, else a negated errno value */
365 static int
366 sg_release(struct inode *inode, struct file *filp)
367 {
368 Sg_device *sdp;
369 Sg_fd *sfp;
370
371 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
372 return -ENXIO;
373 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
374
375 mutex_lock(&sdp->open_rel_lock);
376 scsi_autopm_put_device(sdp->device);
377 kref_put(&sfp->f_ref, sg_remove_sfp);
378 sdp->open_cnt--;
379
380 /* possibly many open()s waiting on exlude clearing, start many;
381 * only open(O_EXCL)s wait on 0==open_cnt so only start one */
382 if (sdp->exclude) {
383 sdp->exclude = false;
384 wake_up_interruptible_all(&sdp->open_wait);
385 } else if (0 == sdp->open_cnt) {
386 wake_up_interruptible(&sdp->open_wait);
387 }
388 mutex_unlock(&sdp->open_rel_lock);
389 return 0;
390 }
391
392 static ssize_t
393 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
394 {
395 Sg_device *sdp;
396 Sg_fd *sfp;
397 Sg_request *srp;
398 int req_pack_id = -1;
399 sg_io_hdr_t *hp;
400 struct sg_header *old_hdr = NULL;
401 int retval = 0;
402
403 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
404 return -ENXIO;
405 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
406 sdp->disk->disk_name, (int) count));
407
408 if (!access_ok(VERIFY_WRITE, buf, count))
409 return -EFAULT;
410 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
411 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
412 if (!old_hdr)
413 return -ENOMEM;
414 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
415 retval = -EFAULT;
416 goto free_old_hdr;
417 }
418 if (old_hdr->reply_len < 0) {
419 if (count >= SZ_SG_IO_HDR) {
420 sg_io_hdr_t *new_hdr;
421 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
422 if (!new_hdr) {
423 retval = -ENOMEM;
424 goto free_old_hdr;
425 }
426 retval =__copy_from_user
427 (new_hdr, buf, SZ_SG_IO_HDR);
428 req_pack_id = new_hdr->pack_id;
429 kfree(new_hdr);
430 if (retval) {
431 retval = -EFAULT;
432 goto free_old_hdr;
433 }
434 }
435 } else
436 req_pack_id = old_hdr->pack_id;
437 }
438 srp = sg_get_rq_mark(sfp, req_pack_id);
439 if (!srp) { /* now wait on packet to arrive */
440 if (atomic_read(&sdp->detaching)) {
441 retval = -ENODEV;
442 goto free_old_hdr;
443 }
444 if (filp->f_flags & O_NONBLOCK) {
445 retval = -EAGAIN;
446 goto free_old_hdr;
447 }
448 retval = wait_event_interruptible(sfp->read_wait,
449 (atomic_read(&sdp->detaching) ||
450 (srp = sg_get_rq_mark(sfp, req_pack_id))));
451 if (atomic_read(&sdp->detaching)) {
452 retval = -ENODEV;
453 goto free_old_hdr;
454 }
455 if (retval) {
456 /* -ERESTARTSYS as signal hit process */
457 goto free_old_hdr;
458 }
459 }
460 if (srp->header.interface_id != '\0') {
461 retval = sg_new_read(sfp, buf, count, srp);
462 goto free_old_hdr;
463 }
464
465 hp = &srp->header;
466 if (old_hdr == NULL) {
467 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
468 if (! old_hdr) {
469 retval = -ENOMEM;
470 goto free_old_hdr;
471 }
472 }
473 memset(old_hdr, 0, SZ_SG_HEADER);
474 old_hdr->reply_len = (int) hp->timeout;
475 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
476 old_hdr->pack_id = hp->pack_id;
477 old_hdr->twelve_byte =
478 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
479 old_hdr->target_status = hp->masked_status;
480 old_hdr->host_status = hp->host_status;
481 old_hdr->driver_status = hp->driver_status;
482 if ((CHECK_CONDITION & hp->masked_status) ||
483 (DRIVER_SENSE & hp->driver_status))
484 memcpy(old_hdr->sense_buffer, srp->sense_b,
485 sizeof (old_hdr->sense_buffer));
486 switch (hp->host_status) {
487 /* This setup of 'result' is for backward compatibility and is best
488 ignored by the user who should use target, host + driver status */
489 case DID_OK:
490 case DID_PASSTHROUGH:
491 case DID_SOFT_ERROR:
492 old_hdr->result = 0;
493 break;
494 case DID_NO_CONNECT:
495 case DID_BUS_BUSY:
496 case DID_TIME_OUT:
497 old_hdr->result = EBUSY;
498 break;
499 case DID_BAD_TARGET:
500 case DID_ABORT:
501 case DID_PARITY:
502 case DID_RESET:
503 case DID_BAD_INTR:
504 old_hdr->result = EIO;
505 break;
506 case DID_ERROR:
507 old_hdr->result = (srp->sense_b[0] == 0 &&
508 hp->masked_status == GOOD) ? 0 : EIO;
509 break;
510 default:
511 old_hdr->result = EIO;
512 break;
513 }
514
515 /* Now copy the result back to the user buffer. */
516 if (count >= SZ_SG_HEADER) {
517 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
518 retval = -EFAULT;
519 goto free_old_hdr;
520 }
521 buf += SZ_SG_HEADER;
522 if (count > old_hdr->reply_len)
523 count = old_hdr->reply_len;
524 if (count > SZ_SG_HEADER) {
525 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
526 retval = -EFAULT;
527 goto free_old_hdr;
528 }
529 }
530 } else
531 count = (old_hdr->result == 0) ? 0 : -EIO;
532 sg_finish_rem_req(srp);
533 retval = count;
534 free_old_hdr:
535 kfree(old_hdr);
536 return retval;
537 }
538
539 static ssize_t
540 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
541 {
542 sg_io_hdr_t *hp = &srp->header;
543 int err = 0;
544 int len;
545
546 if (count < SZ_SG_IO_HDR) {
547 err = -EINVAL;
548 goto err_out;
549 }
550 hp->sb_len_wr = 0;
551 if ((hp->mx_sb_len > 0) && hp->sbp) {
552 if ((CHECK_CONDITION & hp->masked_status) ||
553 (DRIVER_SENSE & hp->driver_status)) {
554 int sb_len = SCSI_SENSE_BUFFERSIZE;
555 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
556 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
557 len = (len > sb_len) ? sb_len : len;
558 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
559 err = -EFAULT;
560 goto err_out;
561 }
562 hp->sb_len_wr = len;
563 }
564 }
565 if (hp->masked_status || hp->host_status || hp->driver_status)
566 hp->info |= SG_INFO_CHECK;
567 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
568 err = -EFAULT;
569 goto err_out;
570 }
571 err_out:
572 err = sg_finish_rem_req(srp);
573 return (0 == err) ? count : err;
574 }
575
576 static ssize_t
577 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
578 {
579 int mxsize, cmd_size, k;
580 int input_size, blocking;
581 unsigned char opcode;
582 Sg_device *sdp;
583 Sg_fd *sfp;
584 Sg_request *srp;
585 struct sg_header old_hdr;
586 sg_io_hdr_t *hp;
587 unsigned char cmnd[SG_MAX_CDB_SIZE];
588
589 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
590 return -ENXIO;
591 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
592 sdp->disk->disk_name, (int) count));
593 if (atomic_read(&sdp->detaching))
594 return -ENODEV;
595 if (!((filp->f_flags & O_NONBLOCK) ||
596 scsi_block_when_processing_errors(sdp->device)))
597 return -ENXIO;
598
599 if (!access_ok(VERIFY_READ, buf, count))
600 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
601 if (count < SZ_SG_HEADER)
602 return -EIO;
603 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
604 return -EFAULT;
605 blocking = !(filp->f_flags & O_NONBLOCK);
606 if (old_hdr.reply_len < 0)
607 return sg_new_write(sfp, filp, buf, count,
608 blocking, 0, 0, NULL);
609 if (count < (SZ_SG_HEADER + 6))
610 return -EIO; /* The minimum scsi command length is 6 bytes. */
611
612 if (!(srp = sg_add_request(sfp))) {
613 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
614 return -EDOM;
615 }
616 buf += SZ_SG_HEADER;
617 __get_user(opcode, buf);
618 if (sfp->next_cmd_len > 0) {
619 cmd_size = sfp->next_cmd_len;
620 sfp->next_cmd_len = 0; /* reset so only this write() effected */
621 } else {
622 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
623 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
624 cmd_size = 12;
625 }
626 SCSI_LOG_TIMEOUT(4, printk(
627 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
628 /* Determine buffer size. */
629 input_size = count - cmd_size;
630 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
631 mxsize -= SZ_SG_HEADER;
632 input_size -= SZ_SG_HEADER;
633 if (input_size < 0) {
634 sg_remove_request(sfp, srp);
635 return -EIO; /* User did not pass enough bytes for this command. */
636 }
637 hp = &srp->header;
638 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
639 hp->cmd_len = (unsigned char) cmd_size;
640 hp->iovec_count = 0;
641 hp->mx_sb_len = 0;
642 if (input_size > 0)
643 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
644 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
645 else
646 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
647 hp->dxfer_len = mxsize;
648 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
649 hp->dxferp = (char __user *)buf + cmd_size;
650 else
651 hp->dxferp = NULL;
652 hp->sbp = NULL;
653 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
654 hp->flags = input_size; /* structure abuse ... */
655 hp->pack_id = old_hdr.pack_id;
656 hp->usr_ptr = NULL;
657 if (__copy_from_user(cmnd, buf, cmd_size))
658 return -EFAULT;
659 /*
660 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
661 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
662 * is a non-zero input_size, so emit a warning.
663 */
664 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
665 static char cmd[TASK_COMM_LEN];
666 if (strcmp(current->comm, cmd)) {
667 printk_ratelimited(KERN_WARNING
668 "sg_write: data in/out %d/%d bytes "
669 "for SCSI command 0x%x-- guessing "
670 "data in;\n program %s not setting "
671 "count and/or reply_len properly\n",
672 old_hdr.reply_len - (int)SZ_SG_HEADER,
673 input_size, (unsigned int) cmnd[0],
674 current->comm);
675 strcpy(cmd, current->comm);
676 }
677 }
678 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
679 return (k < 0) ? k : count;
680 }
681
682 static ssize_t
683 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
684 size_t count, int blocking, int read_only, int sg_io_owned,
685 Sg_request **o_srp)
686 {
687 int k;
688 Sg_request *srp;
689 sg_io_hdr_t *hp;
690 unsigned char cmnd[SG_MAX_CDB_SIZE];
691 int timeout;
692 unsigned long ul_timeout;
693
694 if (count < SZ_SG_IO_HDR)
695 return -EINVAL;
696 if (!access_ok(VERIFY_READ, buf, count))
697 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
698
699 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
700 if (!(srp = sg_add_request(sfp))) {
701 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
702 return -EDOM;
703 }
704 srp->sg_io_owned = sg_io_owned;
705 hp = &srp->header;
706 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
707 sg_remove_request(sfp, srp);
708 return -EFAULT;
709 }
710 if (hp->interface_id != 'S') {
711 sg_remove_request(sfp, srp);
712 return -ENOSYS;
713 }
714 if (hp->flags & SG_FLAG_MMAP_IO) {
715 if (hp->dxfer_len > sfp->reserve.bufflen) {
716 sg_remove_request(sfp, srp);
717 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
718 }
719 if (hp->flags & SG_FLAG_DIRECT_IO) {
720 sg_remove_request(sfp, srp);
721 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
722 }
723 if (sg_res_in_use(sfp)) {
724 sg_remove_request(sfp, srp);
725 return -EBUSY; /* reserve buffer already being used */
726 }
727 }
728 ul_timeout = msecs_to_jiffies(srp->header.timeout);
729 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
730 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
731 sg_remove_request(sfp, srp);
732 return -EMSGSIZE;
733 }
734 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
735 sg_remove_request(sfp, srp);
736 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
737 }
738 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
739 sg_remove_request(sfp, srp);
740 return -EFAULT;
741 }
742 if (read_only && sg_allow_access(file, cmnd)) {
743 sg_remove_request(sfp, srp);
744 return -EPERM;
745 }
746 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
747 if (k < 0)
748 return k;
749 if (o_srp)
750 *o_srp = srp;
751 return count;
752 }
753
754 static int
755 sg_common_write(Sg_fd * sfp, Sg_request * srp,
756 unsigned char *cmnd, int timeout, int blocking)
757 {
758 int k, data_dir, at_head;
759 Sg_device *sdp = sfp->parentdp;
760 sg_io_hdr_t *hp = &srp->header;
761
762 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
763 hp->status = 0;
764 hp->masked_status = 0;
765 hp->msg_status = 0;
766 hp->info = 0;
767 hp->host_status = 0;
768 hp->driver_status = 0;
769 hp->resid = 0;
770 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
771 (int) cmnd[0], (int) hp->cmd_len));
772
773 k = sg_start_req(srp, cmnd);
774 if (k) {
775 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
776 sg_finish_rem_req(srp);
777 return k; /* probably out of space --> ENOMEM */
778 }
779 if (atomic_read(&sdp->detaching)) {
780 if (srp->bio)
781 blk_end_request_all(srp->rq, -EIO);
782 sg_finish_rem_req(srp);
783 return -ENODEV;
784 }
785
786 switch (hp->dxfer_direction) {
787 case SG_DXFER_TO_FROM_DEV:
788 case SG_DXFER_FROM_DEV:
789 data_dir = DMA_FROM_DEVICE;
790 break;
791 case SG_DXFER_TO_DEV:
792 data_dir = DMA_TO_DEVICE;
793 break;
794 case SG_DXFER_UNKNOWN:
795 data_dir = DMA_BIDIRECTIONAL;
796 break;
797 default:
798 data_dir = DMA_NONE;
799 break;
800 }
801 hp->duration = jiffies_to_msecs(jiffies);
802 if (hp->interface_id != '\0' && /* v3 (or later) interface */
803 (SG_FLAG_Q_AT_TAIL & hp->flags))
804 at_head = 0;
805 else
806 at_head = 1;
807
808 srp->rq->timeout = timeout;
809 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
810 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
811 srp->rq, at_head, sg_rq_end_io);
812 return 0;
813 }
814
815 static int srp_done(Sg_fd *sfp, Sg_request *srp)
816 {
817 unsigned long flags;
818 int ret;
819
820 read_lock_irqsave(&sfp->rq_list_lock, flags);
821 ret = srp->done;
822 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
823 return ret;
824 }
825
826 static int max_sectors_bytes(struct request_queue *q)
827 {
828 unsigned int max_sectors = queue_max_sectors(q);
829
830 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
831
832 return max_sectors << 9;
833 }
834
835 static long
836 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
837 {
838 void __user *p = (void __user *)arg;
839 int __user *ip = p;
840 int result, val, read_only;
841 Sg_device *sdp;
842 Sg_fd *sfp;
843 Sg_request *srp;
844 unsigned long iflags;
845
846 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
847 return -ENXIO;
848
849 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
850 sdp->disk->disk_name, (int) cmd_in));
851 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
852
853 switch (cmd_in) {
854 case SG_IO:
855 if (atomic_read(&sdp->detaching))
856 return -ENODEV;
857 if (!scsi_block_when_processing_errors(sdp->device))
858 return -ENXIO;
859 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
860 return -EFAULT;
861 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
862 1, read_only, 1, &srp);
863 if (result < 0)
864 return result;
865 result = wait_event_interruptible(sfp->read_wait,
866 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
867 if (atomic_read(&sdp->detaching))
868 return -ENODEV;
869 write_lock_irq(&sfp->rq_list_lock);
870 if (srp->done) {
871 srp->done = 2;
872 write_unlock_irq(&sfp->rq_list_lock);
873 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
874 return (result < 0) ? result : 0;
875 }
876 srp->orphan = 1;
877 write_unlock_irq(&sfp->rq_list_lock);
878 return result; /* -ERESTARTSYS because signal hit process */
879 case SG_SET_TIMEOUT:
880 result = get_user(val, ip);
881 if (result)
882 return result;
883 if (val < 0)
884 return -EIO;
885 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
886 val = MULDIV (INT_MAX, USER_HZ, HZ);
887 sfp->timeout_user = val;
888 sfp->timeout = MULDIV (val, HZ, USER_HZ);
889
890 return 0;
891 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
892 /* strange ..., for backward compatibility */
893 return sfp->timeout_user;
894 case SG_SET_FORCE_LOW_DMA:
895 result = get_user(val, ip);
896 if (result)
897 return result;
898 if (val) {
899 sfp->low_dma = 1;
900 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
901 val = (int) sfp->reserve.bufflen;
902 sg_remove_scat(&sfp->reserve);
903 sg_build_reserve(sfp, val);
904 }
905 } else {
906 if (atomic_read(&sdp->detaching))
907 return -ENODEV;
908 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
909 }
910 return 0;
911 case SG_GET_LOW_DMA:
912 return put_user((int) sfp->low_dma, ip);
913 case SG_GET_SCSI_ID:
914 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
915 return -EFAULT;
916 else {
917 sg_scsi_id_t __user *sg_idp = p;
918
919 if (atomic_read(&sdp->detaching))
920 return -ENODEV;
921 __put_user((int) sdp->device->host->host_no,
922 &sg_idp->host_no);
923 __put_user((int) sdp->device->channel,
924 &sg_idp->channel);
925 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
926 __put_user((int) sdp->device->lun, &sg_idp->lun);
927 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
928 __put_user((short) sdp->device->host->cmd_per_lun,
929 &sg_idp->h_cmd_per_lun);
930 __put_user((short) sdp->device->queue_depth,
931 &sg_idp->d_queue_depth);
932 __put_user(0, &sg_idp->unused[0]);
933 __put_user(0, &sg_idp->unused[1]);
934 return 0;
935 }
936 case SG_SET_FORCE_PACK_ID:
937 result = get_user(val, ip);
938 if (result)
939 return result;
940 sfp->force_packid = val ? 1 : 0;
941 return 0;
942 case SG_GET_PACK_ID:
943 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
944 return -EFAULT;
945 read_lock_irqsave(&sfp->rq_list_lock, iflags);
946 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
947 if ((1 == srp->done) && (!srp->sg_io_owned)) {
948 read_unlock_irqrestore(&sfp->rq_list_lock,
949 iflags);
950 __put_user(srp->header.pack_id, ip);
951 return 0;
952 }
953 }
954 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
955 __put_user(-1, ip);
956 return 0;
957 case SG_GET_NUM_WAITING:
958 read_lock_irqsave(&sfp->rq_list_lock, iflags);
959 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
960 if ((1 == srp->done) && (!srp->sg_io_owned))
961 ++val;
962 }
963 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
964 return put_user(val, ip);
965 case SG_GET_SG_TABLESIZE:
966 return put_user(sdp->sg_tablesize, ip);
967 case SG_SET_RESERVED_SIZE:
968 result = get_user(val, ip);
969 if (result)
970 return result;
971 if (val < 0)
972 return -EINVAL;
973 val = min_t(int, val,
974 max_sectors_bytes(sdp->device->request_queue));
975 if (val != sfp->reserve.bufflen) {
976 if (sg_res_in_use(sfp) || sfp->mmap_called)
977 return -EBUSY;
978 sg_remove_scat(&sfp->reserve);
979 sg_build_reserve(sfp, val);
980 }
981 return 0;
982 case SG_GET_RESERVED_SIZE:
983 val = min_t(int, sfp->reserve.bufflen,
984 max_sectors_bytes(sdp->device->request_queue));
985 return put_user(val, ip);
986 case SG_SET_COMMAND_Q:
987 result = get_user(val, ip);
988 if (result)
989 return result;
990 sfp->cmd_q = val ? 1 : 0;
991 return 0;
992 case SG_GET_COMMAND_Q:
993 return put_user((int) sfp->cmd_q, ip);
994 case SG_SET_KEEP_ORPHAN:
995 result = get_user(val, ip);
996 if (result)
997 return result;
998 sfp->keep_orphan = val;
999 return 0;
1000 case SG_GET_KEEP_ORPHAN:
1001 return put_user((int) sfp->keep_orphan, ip);
1002 case SG_NEXT_CMD_LEN:
1003 result = get_user(val, ip);
1004 if (result)
1005 return result;
1006 sfp->next_cmd_len = (val > 0) ? val : 0;
1007 return 0;
1008 case SG_GET_VERSION_NUM:
1009 return put_user(sg_version_num, ip);
1010 case SG_GET_ACCESS_COUNT:
1011 /* faked - we don't have a real access count anymore */
1012 val = (sdp->device ? 1 : 0);
1013 return put_user(val, ip);
1014 case SG_GET_REQUEST_TABLE:
1015 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1016 return -EFAULT;
1017 else {
1018 sg_req_info_t *rinfo;
1019 unsigned int ms;
1020
1021 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1022 GFP_KERNEL);
1023 if (!rinfo)
1024 return -ENOMEM;
1025 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1026 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1027 ++val, srp = srp ? srp->nextrp : srp) {
1028 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1029 if (srp) {
1030 rinfo[val].req_state = srp->done + 1;
1031 rinfo[val].problem =
1032 srp->header.masked_status &
1033 srp->header.host_status &
1034 srp->header.driver_status;
1035 if (srp->done)
1036 rinfo[val].duration =
1037 srp->header.duration;
1038 else {
1039 ms = jiffies_to_msecs(jiffies);
1040 rinfo[val].duration =
1041 (ms > srp->header.duration) ?
1042 (ms - srp->header.duration) : 0;
1043 }
1044 rinfo[val].orphan = srp->orphan;
1045 rinfo[val].sg_io_owned =
1046 srp->sg_io_owned;
1047 rinfo[val].pack_id =
1048 srp->header.pack_id;
1049 rinfo[val].usr_ptr =
1050 srp->header.usr_ptr;
1051 }
1052 }
1053 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1054 result = __copy_to_user(p, rinfo,
1055 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1056 result = result ? -EFAULT : 0;
1057 kfree(rinfo);
1058 return result;
1059 }
1060 case SG_EMULATED_HOST:
1061 if (atomic_read(&sdp->detaching))
1062 return -ENODEV;
1063 return put_user(sdp->device->host->hostt->emulated, ip);
1064 case SG_SCSI_RESET:
1065 if (atomic_read(&sdp->detaching))
1066 return -ENODEV;
1067 if (filp->f_flags & O_NONBLOCK) {
1068 if (scsi_host_in_recovery(sdp->device->host))
1069 return -EBUSY;
1070 } else if (!scsi_block_when_processing_errors(sdp->device))
1071 return -EBUSY;
1072 result = get_user(val, ip);
1073 if (result)
1074 return result;
1075 if (SG_SCSI_RESET_NOTHING == val)
1076 return 0;
1077 switch (val) {
1078 case SG_SCSI_RESET_DEVICE:
1079 val = SCSI_TRY_RESET_DEVICE;
1080 break;
1081 case SG_SCSI_RESET_TARGET:
1082 val = SCSI_TRY_RESET_TARGET;
1083 break;
1084 case SG_SCSI_RESET_BUS:
1085 val = SCSI_TRY_RESET_BUS;
1086 break;
1087 case SG_SCSI_RESET_HOST:
1088 val = SCSI_TRY_RESET_HOST;
1089 break;
1090 default:
1091 return -EINVAL;
1092 }
1093 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1094 return -EACCES;
1095 return (scsi_reset_provider(sdp->device, val) ==
1096 SUCCESS) ? 0 : -EIO;
1097 case SCSI_IOCTL_SEND_COMMAND:
1098 if (atomic_read(&sdp->detaching))
1099 return -ENODEV;
1100 if (read_only) {
1101 unsigned char opcode = WRITE_6;
1102 Scsi_Ioctl_Command __user *siocp = p;
1103
1104 if (copy_from_user(&opcode, siocp->data, 1))
1105 return -EFAULT;
1106 if (sg_allow_access(filp, &opcode))
1107 return -EPERM;
1108 }
1109 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1110 case SG_SET_DEBUG:
1111 result = get_user(val, ip);
1112 if (result)
1113 return result;
1114 sdp->sgdebug = (char) val;
1115 return 0;
1116 case SCSI_IOCTL_GET_IDLUN:
1117 case SCSI_IOCTL_GET_BUS_NUMBER:
1118 case SCSI_IOCTL_PROBE_HOST:
1119 case SG_GET_TRANSFORM:
1120 if (atomic_read(&sdp->detaching))
1121 return -ENODEV;
1122 return scsi_ioctl(sdp->device, cmd_in, p);
1123 case BLKSECTGET:
1124 return put_user(max_sectors_bytes(sdp->device->request_queue),
1125 ip);
1126 case BLKTRACESETUP:
1127 return blk_trace_setup(sdp->device->request_queue,
1128 sdp->disk->disk_name,
1129 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1130 NULL,
1131 (char *)arg);
1132 case BLKTRACESTART:
1133 return blk_trace_startstop(sdp->device->request_queue, 1);
1134 case BLKTRACESTOP:
1135 return blk_trace_startstop(sdp->device->request_queue, 0);
1136 case BLKTRACETEARDOWN:
1137 return blk_trace_remove(sdp->device->request_queue);
1138 default:
1139 if (read_only)
1140 return -EPERM; /* don't know so take safe approach */
1141 return scsi_ioctl(sdp->device, cmd_in, p);
1142 }
1143 }
1144
1145 #ifdef CONFIG_COMPAT
1146 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1147 {
1148 Sg_device *sdp;
1149 Sg_fd *sfp;
1150 struct scsi_device *sdev;
1151
1152 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1153 return -ENXIO;
1154
1155 sdev = sdp->device;
1156 if (sdev->host->hostt->compat_ioctl) {
1157 int ret;
1158
1159 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1160
1161 return ret;
1162 }
1163
1164 return -ENOIOCTLCMD;
1165 }
1166 #endif
1167
1168 static unsigned int
1169 sg_poll(struct file *filp, poll_table * wait)
1170 {
1171 unsigned int res = 0;
1172 Sg_device *sdp;
1173 Sg_fd *sfp;
1174 Sg_request *srp;
1175 int count = 0;
1176 unsigned long iflags;
1177
1178 sfp = filp->private_data;
1179 if (!sfp)
1180 return POLLERR;
1181 sdp = sfp->parentdp;
1182 if (!sdp)
1183 return POLLERR;
1184 poll_wait(filp, &sfp->read_wait, wait);
1185 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1186 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1187 /* if any read waiting, flag it */
1188 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1189 res = POLLIN | POLLRDNORM;
1190 ++count;
1191 }
1192 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1193
1194 if (atomic_read(&sdp->detaching))
1195 res |= POLLHUP;
1196 else if (!sfp->cmd_q) {
1197 if (0 == count)
1198 res |= POLLOUT | POLLWRNORM;
1199 } else if (count < SG_MAX_QUEUE)
1200 res |= POLLOUT | POLLWRNORM;
1201 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1202 sdp->disk->disk_name, (int) res));
1203 return res;
1204 }
1205
1206 static int
1207 sg_fasync(int fd, struct file *filp, int mode)
1208 {
1209 Sg_device *sdp;
1210 Sg_fd *sfp;
1211
1212 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1213 return -ENXIO;
1214 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1215 sdp->disk->disk_name, mode));
1216
1217 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1218 }
1219
1220 static int
1221 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1222 {
1223 Sg_fd *sfp;
1224 unsigned long offset, len, sa;
1225 Sg_scatter_hold *rsv_schp;
1226 int k, length;
1227
1228 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1229 return VM_FAULT_SIGBUS;
1230 rsv_schp = &sfp->reserve;
1231 offset = vmf->pgoff << PAGE_SHIFT;
1232 if (offset >= rsv_schp->bufflen)
1233 return VM_FAULT_SIGBUS;
1234 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1235 offset, rsv_schp->k_use_sg));
1236 sa = vma->vm_start;
1237 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1238 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1239 len = vma->vm_end - sa;
1240 len = (len < length) ? len : length;
1241 if (offset < len) {
1242 struct page *page = nth_page(rsv_schp->pages[k],
1243 offset >> PAGE_SHIFT);
1244 get_page(page); /* increment page count */
1245 vmf->page = page;
1246 return 0; /* success */
1247 }
1248 sa += len;
1249 offset -= len;
1250 }
1251
1252 return VM_FAULT_SIGBUS;
1253 }
1254
1255 static const struct vm_operations_struct sg_mmap_vm_ops = {
1256 .fault = sg_vma_fault,
1257 };
1258
1259 static int
1260 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1261 {
1262 Sg_fd *sfp;
1263 unsigned long req_sz, len, sa;
1264 Sg_scatter_hold *rsv_schp;
1265 int k, length;
1266
1267 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1268 return -ENXIO;
1269 req_sz = vma->vm_end - vma->vm_start;
1270 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1271 (void *) vma->vm_start, (int) req_sz));
1272 if (vma->vm_pgoff)
1273 return -EINVAL; /* want no offset */
1274 rsv_schp = &sfp->reserve;
1275 if (req_sz > rsv_schp->bufflen)
1276 return -ENOMEM; /* cannot map more than reserved buffer */
1277
1278 sa = vma->vm_start;
1279 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1280 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1281 len = vma->vm_end - sa;
1282 len = (len < length) ? len : length;
1283 sa += len;
1284 }
1285
1286 sfp->mmap_called = 1;
1287 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1288 vma->vm_private_data = sfp;
1289 vma->vm_ops = &sg_mmap_vm_ops;
1290 return 0;
1291 }
1292
1293 static void
1294 sg_rq_end_io_usercontext(struct work_struct *work)
1295 {
1296 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1297 struct sg_fd *sfp = srp->parentfp;
1298
1299 sg_finish_rem_req(srp);
1300 kref_put(&sfp->f_ref, sg_remove_sfp);
1301 }
1302
1303 /*
1304 * This function is a "bottom half" handler that is called by the mid
1305 * level when a command is completed (or has failed).
1306 */
1307 static void
1308 sg_rq_end_io(struct request *rq, int uptodate)
1309 {
1310 struct sg_request *srp = rq->end_io_data;
1311 Sg_device *sdp;
1312 Sg_fd *sfp;
1313 unsigned long iflags;
1314 unsigned int ms;
1315 char *sense;
1316 int result, resid, done = 1;
1317
1318 if (WARN_ON(srp->done != 0))
1319 return;
1320
1321 sfp = srp->parentfp;
1322 if (WARN_ON(sfp == NULL))
1323 return;
1324
1325 sdp = sfp->parentdp;
1326 if (unlikely(atomic_read(&sdp->detaching)))
1327 pr_info("%s: device detaching\n", __func__);
1328
1329 sense = rq->sense;
1330 result = rq->errors;
1331 resid = rq->resid_len;
1332
1333 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1334 sdp->disk->disk_name, srp->header.pack_id, result));
1335 srp->header.resid = resid;
1336 ms = jiffies_to_msecs(jiffies);
1337 srp->header.duration = (ms > srp->header.duration) ?
1338 (ms - srp->header.duration) : 0;
1339 if (0 != result) {
1340 struct scsi_sense_hdr sshdr;
1341
1342 srp->header.status = 0xff & result;
1343 srp->header.masked_status = status_byte(result);
1344 srp->header.msg_status = msg_byte(result);
1345 srp->header.host_status = host_byte(result);
1346 srp->header.driver_status = driver_byte(result);
1347 if ((sdp->sgdebug > 0) &&
1348 ((CHECK_CONDITION == srp->header.masked_status) ||
1349 (COMMAND_TERMINATED == srp->header.masked_status)))
1350 __scsi_print_sense(__func__, sense,
1351 SCSI_SENSE_BUFFERSIZE);
1352
1353 /* Following if statement is a patch supplied by Eric Youngdale */
1354 if (driver_byte(result) != 0
1355 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1356 && !scsi_sense_is_deferred(&sshdr)
1357 && sshdr.sense_key == UNIT_ATTENTION
1358 && sdp->device->removable) {
1359 /* Detected possible disc change. Set the bit - this */
1360 /* may be used if there are filesystems using this device */
1361 sdp->device->changed = 1;
1362 }
1363 }
1364 /* Rely on write phase to clean out srp status values, so no "else" */
1365
1366 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1367 if (unlikely(srp->orphan)) {
1368 if (sfp->keep_orphan)
1369 srp->sg_io_owned = 0;
1370 else
1371 done = 0;
1372 }
1373 srp->done = done;
1374 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1375
1376 if (likely(done)) {
1377 /* Now wake up any sg_read() that is waiting for this
1378 * packet.
1379 */
1380 wake_up_interruptible(&sfp->read_wait);
1381 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1382 kref_put(&sfp->f_ref, sg_remove_sfp);
1383 } else {
1384 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1385 schedule_work(&srp->ew.work);
1386 }
1387 }
1388
1389 static const struct file_operations sg_fops = {
1390 .owner = THIS_MODULE,
1391 .read = sg_read,
1392 .write = sg_write,
1393 .poll = sg_poll,
1394 .unlocked_ioctl = sg_ioctl,
1395 #ifdef CONFIG_COMPAT
1396 .compat_ioctl = sg_compat_ioctl,
1397 #endif
1398 .open = sg_open,
1399 .mmap = sg_mmap,
1400 .release = sg_release,
1401 .fasync = sg_fasync,
1402 .llseek = no_llseek,
1403 };
1404
1405 static struct class *sg_sysfs_class;
1406
1407 static int sg_sysfs_valid = 0;
1408
1409 static Sg_device *
1410 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1411 {
1412 struct request_queue *q = scsidp->request_queue;
1413 Sg_device *sdp;
1414 unsigned long iflags;
1415 int error;
1416 u32 k;
1417
1418 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1419 if (!sdp) {
1420 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1421 "failure\n", __func__);
1422 return ERR_PTR(-ENOMEM);
1423 }
1424
1425 idr_preload(GFP_KERNEL);
1426 write_lock_irqsave(&sg_index_lock, iflags);
1427
1428 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1429 if (error < 0) {
1430 if (error == -ENOSPC) {
1431 sdev_printk(KERN_WARNING, scsidp,
1432 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1433 scsidp->type, SG_MAX_DEVS - 1);
1434 error = -ENODEV;
1435 } else {
1436 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1437 "allocation Sg_device failure: %d\n",
1438 __func__, error);
1439 }
1440 goto out_unlock;
1441 }
1442 k = error;
1443
1444 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1445 sprintf(disk->disk_name, "sg%d", k);
1446 disk->first_minor = k;
1447 sdp->disk = disk;
1448 sdp->device = scsidp;
1449 mutex_init(&sdp->open_rel_lock);
1450 INIT_LIST_HEAD(&sdp->sfds);
1451 init_waitqueue_head(&sdp->open_wait);
1452 atomic_set(&sdp->detaching, 0);
1453 rwlock_init(&sdp->sfd_lock);
1454 sdp->sg_tablesize = queue_max_segments(q);
1455 sdp->index = k;
1456 kref_init(&sdp->d_ref);
1457 error = 0;
1458
1459 out_unlock:
1460 write_unlock_irqrestore(&sg_index_lock, iflags);
1461 idr_preload_end();
1462
1463 if (error) {
1464 kfree(sdp);
1465 return ERR_PTR(error);
1466 }
1467 return sdp;
1468 }
1469
1470 static int
1471 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1472 {
1473 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1474 struct gendisk *disk;
1475 Sg_device *sdp = NULL;
1476 struct cdev * cdev = NULL;
1477 int error;
1478 unsigned long iflags;
1479
1480 disk = alloc_disk(1);
1481 if (!disk) {
1482 pr_warn("%s: alloc_disk failed\n", __func__);
1483 return -ENOMEM;
1484 }
1485 disk->major = SCSI_GENERIC_MAJOR;
1486
1487 error = -ENOMEM;
1488 cdev = cdev_alloc();
1489 if (!cdev) {
1490 pr_warn("%s: cdev_alloc failed\n", __func__);
1491 goto out;
1492 }
1493 cdev->owner = THIS_MODULE;
1494 cdev->ops = &sg_fops;
1495
1496 sdp = sg_alloc(disk, scsidp);
1497 if (IS_ERR(sdp)) {
1498 pr_warn("%s: sg_alloc failed\n", __func__);
1499 error = PTR_ERR(sdp);
1500 goto out;
1501 }
1502
1503 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1504 if (error)
1505 goto cdev_add_err;
1506
1507 sdp->cdev = cdev;
1508 if (sg_sysfs_valid) {
1509 struct device *sg_class_member;
1510
1511 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1512 MKDEV(SCSI_GENERIC_MAJOR,
1513 sdp->index),
1514 sdp, "%s", disk->disk_name);
1515 if (IS_ERR(sg_class_member)) {
1516 pr_err("%s: device_create failed\n", __func__);
1517 error = PTR_ERR(sg_class_member);
1518 goto cdev_add_err;
1519 }
1520 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1521 &sg_class_member->kobj, "generic");
1522 if (error)
1523 pr_err("%s: unable to make symlink 'generic' back "
1524 "to sg%d\n", __func__, sdp->index);
1525 } else
1526 pr_warn("%s: sg_sys Invalid\n", __func__);
1527
1528 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1529 "type %d\n", sdp->index, scsidp->type);
1530
1531 dev_set_drvdata(cl_dev, sdp);
1532
1533 return 0;
1534
1535 cdev_add_err:
1536 write_lock_irqsave(&sg_index_lock, iflags);
1537 idr_remove(&sg_index_idr, sdp->index);
1538 write_unlock_irqrestore(&sg_index_lock, iflags);
1539 kfree(sdp);
1540
1541 out:
1542 put_disk(disk);
1543 if (cdev)
1544 cdev_del(cdev);
1545 return error;
1546 }
1547
1548 static void
1549 sg_device_destroy(struct kref *kref)
1550 {
1551 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1552 unsigned long flags;
1553
1554 /* CAUTION! Note that the device can still be found via idr_find()
1555 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1556 * any other cleanup.
1557 */
1558
1559 write_lock_irqsave(&sg_index_lock, flags);
1560 idr_remove(&sg_index_idr, sdp->index);
1561 write_unlock_irqrestore(&sg_index_lock, flags);
1562
1563 SCSI_LOG_TIMEOUT(3,
1564 printk("sg_device_destroy: %s\n",
1565 sdp->disk->disk_name));
1566
1567 put_disk(sdp->disk);
1568 kfree(sdp);
1569 }
1570
1571 static void
1572 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1573 {
1574 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1575 Sg_device *sdp = dev_get_drvdata(cl_dev);
1576 unsigned long iflags;
1577 Sg_fd *sfp;
1578 int val;
1579
1580 if (!sdp)
1581 return;
1582 /* want sdp->detaching non-zero as soon as possible */
1583 val = atomic_inc_return(&sdp->detaching);
1584 if (val > 1)
1585 return; /* only want to do following once per device */
1586
1587 SCSI_LOG_TIMEOUT(3, printk("%s: %s\n", __func__,
1588 sdp->disk->disk_name));
1589
1590 read_lock_irqsave(&sdp->sfd_lock, iflags);
1591 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1592 wake_up_interruptible_all(&sfp->read_wait);
1593 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1594 }
1595 wake_up_interruptible_all(&sdp->open_wait);
1596 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1597
1598 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1599 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1600 cdev_del(sdp->cdev);
1601 sdp->cdev = NULL;
1602
1603 kref_put(&sdp->d_ref, sg_device_destroy);
1604 }
1605
1606 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1607 module_param_named(def_reserved_size, def_reserved_size, int,
1608 S_IRUGO | S_IWUSR);
1609 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1610
1611 MODULE_AUTHOR("Douglas Gilbert");
1612 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1613 MODULE_LICENSE("GPL");
1614 MODULE_VERSION(SG_VERSION_STR);
1615 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1616
1617 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1618 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1619 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1620 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1621
1622 static int __init
1623 init_sg(void)
1624 {
1625 int rc;
1626
1627 if (scatter_elem_sz < PAGE_SIZE) {
1628 scatter_elem_sz = PAGE_SIZE;
1629 scatter_elem_sz_prev = scatter_elem_sz;
1630 }
1631 if (def_reserved_size >= 0)
1632 sg_big_buff = def_reserved_size;
1633 else
1634 def_reserved_size = sg_big_buff;
1635
1636 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1637 SG_MAX_DEVS, "sg");
1638 if (rc)
1639 return rc;
1640 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1641 if ( IS_ERR(sg_sysfs_class) ) {
1642 rc = PTR_ERR(sg_sysfs_class);
1643 goto err_out;
1644 }
1645 sg_sysfs_valid = 1;
1646 rc = scsi_register_interface(&sg_interface);
1647 if (0 == rc) {
1648 #ifdef CONFIG_SCSI_PROC_FS
1649 sg_proc_init();
1650 #endif /* CONFIG_SCSI_PROC_FS */
1651 return 0;
1652 }
1653 class_destroy(sg_sysfs_class);
1654 err_out:
1655 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1656 return rc;
1657 }
1658
1659 static void __exit
1660 exit_sg(void)
1661 {
1662 #ifdef CONFIG_SCSI_PROC_FS
1663 sg_proc_cleanup();
1664 #endif /* CONFIG_SCSI_PROC_FS */
1665 scsi_unregister_interface(&sg_interface);
1666 class_destroy(sg_sysfs_class);
1667 sg_sysfs_valid = 0;
1668 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1669 SG_MAX_DEVS);
1670 idr_destroy(&sg_index_idr);
1671 }
1672
1673 static int
1674 sg_start_req(Sg_request *srp, unsigned char *cmd)
1675 {
1676 int res;
1677 struct request *rq;
1678 Sg_fd *sfp = srp->parentfp;
1679 sg_io_hdr_t *hp = &srp->header;
1680 int dxfer_len = (int) hp->dxfer_len;
1681 int dxfer_dir = hp->dxfer_direction;
1682 unsigned int iov_count = hp->iovec_count;
1683 Sg_scatter_hold *req_schp = &srp->data;
1684 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1685 struct request_queue *q = sfp->parentdp->device->request_queue;
1686 struct rq_map_data *md, map_data;
1687 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1688 unsigned char *long_cmdp = NULL;
1689
1690 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1691 dxfer_len));
1692
1693 if (hp->cmd_len > BLK_MAX_CDB) {
1694 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1695 if (!long_cmdp)
1696 return -ENOMEM;
1697 }
1698
1699 rq = blk_get_request(q, rw, GFP_ATOMIC);
1700 if (!rq) {
1701 kfree(long_cmdp);
1702 return -ENOMEM;
1703 }
1704
1705 blk_rq_set_block_pc(rq);
1706
1707 if (hp->cmd_len > BLK_MAX_CDB)
1708 rq->cmd = long_cmdp;
1709 memcpy(rq->cmd, cmd, hp->cmd_len);
1710 rq->cmd_len = hp->cmd_len;
1711
1712 srp->rq = rq;
1713 rq->end_io_data = srp;
1714 rq->sense = srp->sense_b;
1715 rq->retries = SG_DEFAULT_RETRIES;
1716
1717 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1718 return 0;
1719
1720 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1721 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1722 !sfp->parentdp->device->host->unchecked_isa_dma &&
1723 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1724 md = NULL;
1725 else
1726 md = &map_data;
1727
1728 if (md) {
1729 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1730 sg_link_reserve(sfp, srp, dxfer_len);
1731 else {
1732 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1733 if (res)
1734 return res;
1735 }
1736
1737 md->pages = req_schp->pages;
1738 md->page_order = req_schp->page_order;
1739 md->nr_entries = req_schp->k_use_sg;
1740 md->offset = 0;
1741 md->null_mapped = hp->dxferp ? 0 : 1;
1742 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1743 md->from_user = 1;
1744 else
1745 md->from_user = 0;
1746 }
1747
1748 if (iov_count) {
1749 int len, size = sizeof(struct sg_iovec) * iov_count;
1750 struct iovec *iov;
1751
1752 iov = memdup_user(hp->dxferp, size);
1753 if (IS_ERR(iov))
1754 return PTR_ERR(iov);
1755
1756 len = iov_length(iov, iov_count);
1757 if (hp->dxfer_len < len) {
1758 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1759 len = hp->dxfer_len;
1760 }
1761
1762 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1763 iov_count,
1764 len, GFP_ATOMIC);
1765 kfree(iov);
1766 } else
1767 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1768 hp->dxfer_len, GFP_ATOMIC);
1769
1770 if (!res) {
1771 srp->bio = rq->bio;
1772
1773 if (!md) {
1774 req_schp->dio_in_use = 1;
1775 hp->info |= SG_INFO_DIRECT_IO;
1776 }
1777 }
1778 return res;
1779 }
1780
1781 static int
1782 sg_finish_rem_req(Sg_request *srp)
1783 {
1784 int ret = 0;
1785
1786 Sg_fd *sfp = srp->parentfp;
1787 Sg_scatter_hold *req_schp = &srp->data;
1788
1789 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1790 if (srp->rq) {
1791 if (srp->bio)
1792 ret = blk_rq_unmap_user(srp->bio);
1793
1794 if (srp->rq->cmd != srp->rq->__cmd)
1795 kfree(srp->rq->cmd);
1796 blk_put_request(srp->rq);
1797 }
1798
1799 if (srp->res_used)
1800 sg_unlink_reserve(sfp, srp);
1801 else
1802 sg_remove_scat(req_schp);
1803
1804 sg_remove_request(sfp, srp);
1805
1806 return ret;
1807 }
1808
1809 static int
1810 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1811 {
1812 int sg_bufflen = tablesize * sizeof(struct page *);
1813 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1814
1815 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1816 if (!schp->pages)
1817 return -ENOMEM;
1818 schp->sglist_len = sg_bufflen;
1819 return tablesize; /* number of scat_gath elements allocated */
1820 }
1821
1822 static int
1823 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1824 {
1825 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1826 int sg_tablesize = sfp->parentdp->sg_tablesize;
1827 int blk_size = buff_size, order;
1828 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1829
1830 if (blk_size < 0)
1831 return -EFAULT;
1832 if (0 == blk_size)
1833 ++blk_size; /* don't know why */
1834 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1835 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1836 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1837 buff_size, blk_size));
1838
1839 /* N.B. ret_sz carried into this block ... */
1840 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1841 if (mx_sc_elems < 0)
1842 return mx_sc_elems; /* most likely -ENOMEM */
1843
1844 num = scatter_elem_sz;
1845 if (unlikely(num != scatter_elem_sz_prev)) {
1846 if (num < PAGE_SIZE) {
1847 scatter_elem_sz = PAGE_SIZE;
1848 scatter_elem_sz_prev = PAGE_SIZE;
1849 } else
1850 scatter_elem_sz_prev = num;
1851 }
1852
1853 if (sfp->low_dma)
1854 gfp_mask |= GFP_DMA;
1855
1856 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1857 gfp_mask |= __GFP_ZERO;
1858
1859 order = get_order(num);
1860 retry:
1861 ret_sz = 1 << (PAGE_SHIFT + order);
1862
1863 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1864 k++, rem_sz -= ret_sz) {
1865
1866 num = (rem_sz > scatter_elem_sz_prev) ?
1867 scatter_elem_sz_prev : rem_sz;
1868
1869 schp->pages[k] = alloc_pages(gfp_mask, order);
1870 if (!schp->pages[k])
1871 goto out;
1872
1873 if (num == scatter_elem_sz_prev) {
1874 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1875 scatter_elem_sz = ret_sz;
1876 scatter_elem_sz_prev = ret_sz;
1877 }
1878 }
1879
1880 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1881 "ret_sz=%d\n", k, num, ret_sz));
1882 } /* end of for loop */
1883
1884 schp->page_order = order;
1885 schp->k_use_sg = k;
1886 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1887 "rem_sz=%d\n", k, rem_sz));
1888
1889 schp->bufflen = blk_size;
1890 if (rem_sz > 0) /* must have failed */
1891 return -ENOMEM;
1892 return 0;
1893 out:
1894 for (i = 0; i < k; i++)
1895 __free_pages(schp->pages[i], order);
1896
1897 if (--order >= 0)
1898 goto retry;
1899
1900 return -ENOMEM;
1901 }
1902
1903 static void
1904 sg_remove_scat(Sg_scatter_hold * schp)
1905 {
1906 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1907 if (schp->pages && schp->sglist_len > 0) {
1908 if (!schp->dio_in_use) {
1909 int k;
1910
1911 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1912 SCSI_LOG_TIMEOUT(5, printk(
1913 "sg_remove_scat: k=%d, pg=0x%p\n",
1914 k, schp->pages[k]));
1915 __free_pages(schp->pages[k], schp->page_order);
1916 }
1917
1918 kfree(schp->pages);
1919 }
1920 }
1921 memset(schp, 0, sizeof (*schp));
1922 }
1923
1924 static int
1925 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1926 {
1927 Sg_scatter_hold *schp = &srp->data;
1928 int k, num;
1929
1930 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1931 num_read_xfer));
1932 if ((!outp) || (num_read_xfer <= 0))
1933 return 0;
1934
1935 num = 1 << (PAGE_SHIFT + schp->page_order);
1936 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1937 if (num > num_read_xfer) {
1938 if (__copy_to_user(outp, page_address(schp->pages[k]),
1939 num_read_xfer))
1940 return -EFAULT;
1941 break;
1942 } else {
1943 if (__copy_to_user(outp, page_address(schp->pages[k]),
1944 num))
1945 return -EFAULT;
1946 num_read_xfer -= num;
1947 if (num_read_xfer <= 0)
1948 break;
1949 outp += num;
1950 }
1951 }
1952
1953 return 0;
1954 }
1955
1956 static void
1957 sg_build_reserve(Sg_fd * sfp, int req_size)
1958 {
1959 Sg_scatter_hold *schp = &sfp->reserve;
1960
1961 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1962 do {
1963 if (req_size < PAGE_SIZE)
1964 req_size = PAGE_SIZE;
1965 if (0 == sg_build_indirect(schp, sfp, req_size))
1966 return;
1967 else
1968 sg_remove_scat(schp);
1969 req_size >>= 1; /* divide by 2 */
1970 } while (req_size > (PAGE_SIZE / 2));
1971 }
1972
1973 static void
1974 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1975 {
1976 Sg_scatter_hold *req_schp = &srp->data;
1977 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1978 int k, num, rem;
1979
1980 srp->res_used = 1;
1981 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1982 rem = size;
1983
1984 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1985 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1986 if (rem <= num) {
1987 req_schp->k_use_sg = k + 1;
1988 req_schp->sglist_len = rsv_schp->sglist_len;
1989 req_schp->pages = rsv_schp->pages;
1990
1991 req_schp->bufflen = size;
1992 req_schp->page_order = rsv_schp->page_order;
1993 break;
1994 } else
1995 rem -= num;
1996 }
1997
1998 if (k >= rsv_schp->k_use_sg)
1999 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2000 }
2001
2002 static void
2003 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2004 {
2005 Sg_scatter_hold *req_schp = &srp->data;
2006
2007 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2008 (int) req_schp->k_use_sg));
2009 req_schp->k_use_sg = 0;
2010 req_schp->bufflen = 0;
2011 req_schp->pages = NULL;
2012 req_schp->page_order = 0;
2013 req_schp->sglist_len = 0;
2014 sfp->save_scat_len = 0;
2015 srp->res_used = 0;
2016 }
2017
2018 static Sg_request *
2019 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2020 {
2021 Sg_request *resp;
2022 unsigned long iflags;
2023
2024 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2025 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2026 /* look for requests that are ready + not SG_IO owned */
2027 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2028 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2029 resp->done = 2; /* guard against other readers */
2030 break;
2031 }
2032 }
2033 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2034 return resp;
2035 }
2036
2037 /* always adds to end of list */
2038 static Sg_request *
2039 sg_add_request(Sg_fd * sfp)
2040 {
2041 int k;
2042 unsigned long iflags;
2043 Sg_request *resp;
2044 Sg_request *rp = sfp->req_arr;
2045
2046 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2047 resp = sfp->headrp;
2048 if (!resp) {
2049 memset(rp, 0, sizeof (Sg_request));
2050 rp->parentfp = sfp;
2051 resp = rp;
2052 sfp->headrp = resp;
2053 } else {
2054 if (0 == sfp->cmd_q)
2055 resp = NULL; /* command queuing disallowed */
2056 else {
2057 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2058 if (!rp->parentfp)
2059 break;
2060 }
2061 if (k < SG_MAX_QUEUE) {
2062 memset(rp, 0, sizeof (Sg_request));
2063 rp->parentfp = sfp;
2064 while (resp->nextrp)
2065 resp = resp->nextrp;
2066 resp->nextrp = rp;
2067 resp = rp;
2068 } else
2069 resp = NULL;
2070 }
2071 }
2072 if (resp) {
2073 resp->nextrp = NULL;
2074 resp->header.duration = jiffies_to_msecs(jiffies);
2075 }
2076 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2077 return resp;
2078 }
2079
2080 /* Return of 1 for found; 0 for not found */
2081 static int
2082 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2083 {
2084 Sg_request *prev_rp;
2085 Sg_request *rp;
2086 unsigned long iflags;
2087 int res = 0;
2088
2089 if ((!sfp) || (!srp) || (!sfp->headrp))
2090 return res;
2091 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2092 prev_rp = sfp->headrp;
2093 if (srp == prev_rp) {
2094 sfp->headrp = prev_rp->nextrp;
2095 prev_rp->parentfp = NULL;
2096 res = 1;
2097 } else {
2098 while ((rp = prev_rp->nextrp)) {
2099 if (srp == rp) {
2100 prev_rp->nextrp = rp->nextrp;
2101 rp->parentfp = NULL;
2102 res = 1;
2103 break;
2104 }
2105 prev_rp = rp;
2106 }
2107 }
2108 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2109 return res;
2110 }
2111
2112 static Sg_fd *
2113 sg_add_sfp(Sg_device * sdp, int dev)
2114 {
2115 Sg_fd *sfp;
2116 unsigned long iflags;
2117 int bufflen;
2118
2119 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2120 if (!sfp)
2121 return ERR_PTR(-ENOMEM);
2122
2123 init_waitqueue_head(&sfp->read_wait);
2124 rwlock_init(&sfp->rq_list_lock);
2125
2126 kref_init(&sfp->f_ref);
2127 sfp->timeout = SG_DEFAULT_TIMEOUT;
2128 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2129 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2130 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2131 sdp->device->host->unchecked_isa_dma : 1;
2132 sfp->cmd_q = SG_DEF_COMMAND_Q;
2133 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2134 sfp->parentdp = sdp;
2135 write_lock_irqsave(&sdp->sfd_lock, iflags);
2136 if (atomic_read(&sdp->detaching)) {
2137 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2138 return ERR_PTR(-ENODEV);
2139 }
2140 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2141 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2142 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2143 if (unlikely(sg_big_buff != def_reserved_size))
2144 sg_big_buff = def_reserved_size;
2145
2146 bufflen = min_t(int, sg_big_buff,
2147 max_sectors_bytes(sdp->device->request_queue));
2148 sg_build_reserve(sfp, bufflen);
2149 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2150 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2151
2152 kref_get(&sdp->d_ref);
2153 __module_get(THIS_MODULE);
2154 return sfp;
2155 }
2156
2157 static void
2158 sg_remove_sfp_usercontext(struct work_struct *work)
2159 {
2160 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2161 struct sg_device *sdp = sfp->parentdp;
2162
2163 /* Cleanup any responses which were never read(). */
2164 while (sfp->headrp)
2165 sg_finish_rem_req(sfp->headrp);
2166
2167 if (sfp->reserve.bufflen > 0) {
2168 SCSI_LOG_TIMEOUT(6,
2169 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2170 (int) sfp->reserve.bufflen,
2171 (int) sfp->reserve.k_use_sg));
2172 sg_remove_scat(&sfp->reserve);
2173 }
2174
2175 SCSI_LOG_TIMEOUT(6,
2176 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2177 sdp->disk->disk_name,
2178 sfp));
2179 kfree(sfp);
2180
2181 scsi_device_put(sdp->device);
2182 kref_put(&sdp->d_ref, sg_device_destroy);
2183 module_put(THIS_MODULE);
2184 }
2185
2186 static void
2187 sg_remove_sfp(struct kref *kref)
2188 {
2189 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2190 struct sg_device *sdp = sfp->parentdp;
2191 unsigned long iflags;
2192
2193 write_lock_irqsave(&sdp->sfd_lock, iflags);
2194 list_del(&sfp->sfd_siblings);
2195 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2196
2197 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2198 schedule_work(&sfp->ew.work);
2199 }
2200
2201 static int
2202 sg_res_in_use(Sg_fd * sfp)
2203 {
2204 const Sg_request *srp;
2205 unsigned long iflags;
2206
2207 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2208 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2209 if (srp->res_used)
2210 break;
2211 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2212 return srp ? 1 : 0;
2213 }
2214
2215 #ifdef CONFIG_SCSI_PROC_FS
2216 static int
2217 sg_idr_max_id(int id, void *p, void *data)
2218 {
2219 int *k = data;
2220
2221 if (*k < id)
2222 *k = id;
2223
2224 return 0;
2225 }
2226
2227 static int
2228 sg_last_dev(void)
2229 {
2230 int k = -1;
2231 unsigned long iflags;
2232
2233 read_lock_irqsave(&sg_index_lock, iflags);
2234 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2235 read_unlock_irqrestore(&sg_index_lock, iflags);
2236 return k + 1; /* origin 1 */
2237 }
2238 #endif
2239
2240 /* must be called with sg_index_lock held */
2241 static Sg_device *sg_lookup_dev(int dev)
2242 {
2243 return idr_find(&sg_index_idr, dev);
2244 }
2245
2246 static Sg_device *
2247 sg_get_dev(int dev)
2248 {
2249 struct sg_device *sdp;
2250 unsigned long flags;
2251
2252 read_lock_irqsave(&sg_index_lock, flags);
2253 sdp = sg_lookup_dev(dev);
2254 if (!sdp)
2255 sdp = ERR_PTR(-ENXIO);
2256 else if (atomic_read(&sdp->detaching)) {
2257 /* If sdp->detaching, then the refcount may already be 0, in
2258 * which case it would be a bug to do kref_get().
2259 */
2260 sdp = ERR_PTR(-ENODEV);
2261 } else
2262 kref_get(&sdp->d_ref);
2263 read_unlock_irqrestore(&sg_index_lock, flags);
2264
2265 return sdp;
2266 }
2267
2268 #ifdef CONFIG_SCSI_PROC_FS
2269
2270 static struct proc_dir_entry *sg_proc_sgp = NULL;
2271
2272 static char sg_proc_sg_dirname[] = "scsi/sg";
2273
2274 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2275
2276 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2277 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2278 size_t count, loff_t *off);
2279 static const struct file_operations adio_fops = {
2280 .owner = THIS_MODULE,
2281 .open = sg_proc_single_open_adio,
2282 .read = seq_read,
2283 .llseek = seq_lseek,
2284 .write = sg_proc_write_adio,
2285 .release = single_release,
2286 };
2287
2288 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2289 static ssize_t sg_proc_write_dressz(struct file *filp,
2290 const char __user *buffer, size_t count, loff_t *off);
2291 static const struct file_operations dressz_fops = {
2292 .owner = THIS_MODULE,
2293 .open = sg_proc_single_open_dressz,
2294 .read = seq_read,
2295 .llseek = seq_lseek,
2296 .write = sg_proc_write_dressz,
2297 .release = single_release,
2298 };
2299
2300 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2301 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2302 static const struct file_operations version_fops = {
2303 .owner = THIS_MODULE,
2304 .open = sg_proc_single_open_version,
2305 .read = seq_read,
2306 .llseek = seq_lseek,
2307 .release = single_release,
2308 };
2309
2310 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2311 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2312 static const struct file_operations devhdr_fops = {
2313 .owner = THIS_MODULE,
2314 .open = sg_proc_single_open_devhdr,
2315 .read = seq_read,
2316 .llseek = seq_lseek,
2317 .release = single_release,
2318 };
2319
2320 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2321 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2322 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2323 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2324 static void dev_seq_stop(struct seq_file *s, void *v);
2325 static const struct file_operations dev_fops = {
2326 .owner = THIS_MODULE,
2327 .open = sg_proc_open_dev,
2328 .read = seq_read,
2329 .llseek = seq_lseek,
2330 .release = seq_release,
2331 };
2332 static const struct seq_operations dev_seq_ops = {
2333 .start = dev_seq_start,
2334 .next = dev_seq_next,
2335 .stop = dev_seq_stop,
2336 .show = sg_proc_seq_show_dev,
2337 };
2338
2339 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2340 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2341 static const struct file_operations devstrs_fops = {
2342 .owner = THIS_MODULE,
2343 .open = sg_proc_open_devstrs,
2344 .read = seq_read,
2345 .llseek = seq_lseek,
2346 .release = seq_release,
2347 };
2348 static const struct seq_operations devstrs_seq_ops = {
2349 .start = dev_seq_start,
2350 .next = dev_seq_next,
2351 .stop = dev_seq_stop,
2352 .show = sg_proc_seq_show_devstrs,
2353 };
2354
2355 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2356 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2357 static const struct file_operations debug_fops = {
2358 .owner = THIS_MODULE,
2359 .open = sg_proc_open_debug,
2360 .read = seq_read,
2361 .llseek = seq_lseek,
2362 .release = seq_release,
2363 };
2364 static const struct seq_operations debug_seq_ops = {
2365 .start = dev_seq_start,
2366 .next = dev_seq_next,
2367 .stop = dev_seq_stop,
2368 .show = sg_proc_seq_show_debug,
2369 };
2370
2371
2372 struct sg_proc_leaf {
2373 const char * name;
2374 const struct file_operations * fops;
2375 };
2376
2377 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2378 {"allow_dio", &adio_fops},
2379 {"debug", &debug_fops},
2380 {"def_reserved_size", &dressz_fops},
2381 {"device_hdr", &devhdr_fops},
2382 {"devices", &dev_fops},
2383 {"device_strs", &devstrs_fops},
2384 {"version", &version_fops}
2385 };
2386
2387 static int
2388 sg_proc_init(void)
2389 {
2390 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2391 int k;
2392
2393 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2394 if (!sg_proc_sgp)
2395 return 1;
2396 for (k = 0; k < num_leaves; ++k) {
2397 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2398 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2399 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2400 }
2401 return 0;
2402 }
2403
2404 static void
2405 sg_proc_cleanup(void)
2406 {
2407 int k;
2408 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2409
2410 if (!sg_proc_sgp)
2411 return;
2412 for (k = 0; k < num_leaves; ++k)
2413 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2414 remove_proc_entry(sg_proc_sg_dirname, NULL);
2415 }
2416
2417
2418 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2419 {
2420 seq_printf(s, "%d\n", *((int *)s->private));
2421 return 0;
2422 }
2423
2424 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2425 {
2426 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2427 }
2428
2429 static ssize_t
2430 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2431 size_t count, loff_t *off)
2432 {
2433 int err;
2434 unsigned long num;
2435
2436 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2437 return -EACCES;
2438 err = kstrtoul_from_user(buffer, count, 0, &num);
2439 if (err)
2440 return err;
2441 sg_allow_dio = num ? 1 : 0;
2442 return count;
2443 }
2444
2445 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2446 {
2447 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2448 }
2449
2450 static ssize_t
2451 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2452 size_t count, loff_t *off)
2453 {
2454 int err;
2455 unsigned long k = ULONG_MAX;
2456
2457 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2458 return -EACCES;
2459
2460 err = kstrtoul_from_user(buffer, count, 0, &k);
2461 if (err)
2462 return err;
2463 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2464 sg_big_buff = k;
2465 return count;
2466 }
2467 return -ERANGE;
2468 }
2469
2470 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2471 {
2472 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2473 sg_version_date);
2474 return 0;
2475 }
2476
2477 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2478 {
2479 return single_open(file, sg_proc_seq_show_version, NULL);
2480 }
2481
2482 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2483 {
2484 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
2485 return 0;
2486 }
2487
2488 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2489 {
2490 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2491 }
2492
2493 struct sg_proc_deviter {
2494 loff_t index;
2495 size_t max;
2496 };
2497
2498 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2499 {
2500 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2501
2502 s->private = it;
2503 if (! it)
2504 return NULL;
2505
2506 it->index = *pos;
2507 it->max = sg_last_dev();
2508 if (it->index >= it->max)
2509 return NULL;
2510 return it;
2511 }
2512
2513 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2514 {
2515 struct sg_proc_deviter * it = s->private;
2516
2517 *pos = ++it->index;
2518 return (it->index < it->max) ? it : NULL;
2519 }
2520
2521 static void dev_seq_stop(struct seq_file *s, void *v)
2522 {
2523 kfree(s->private);
2524 }
2525
2526 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2527 {
2528 return seq_open(file, &dev_seq_ops);
2529 }
2530
2531 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2532 {
2533 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2534 Sg_device *sdp;
2535 struct scsi_device *scsidp;
2536 unsigned long iflags;
2537
2538 read_lock_irqsave(&sg_index_lock, iflags);
2539 sdp = it ? sg_lookup_dev(it->index) : NULL;
2540 if ((NULL == sdp) || (NULL == sdp->device) ||
2541 (atomic_read(&sdp->detaching)))
2542 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2543 else {
2544 scsidp = sdp->device;
2545 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
2546 scsidp->host->host_no, scsidp->channel,
2547 scsidp->id, scsidp->lun, (int) scsidp->type,
2548 1,
2549 (int) scsidp->queue_depth,
2550 (int) scsidp->device_busy,
2551 (int) scsi_device_online(scsidp));
2552 }
2553 read_unlock_irqrestore(&sg_index_lock, iflags);
2554 return 0;
2555 }
2556
2557 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2558 {
2559 return seq_open(file, &devstrs_seq_ops);
2560 }
2561
2562 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2563 {
2564 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2565 Sg_device *sdp;
2566 struct scsi_device *scsidp;
2567 unsigned long iflags;
2568
2569 read_lock_irqsave(&sg_index_lock, iflags);
2570 sdp = it ? sg_lookup_dev(it->index) : NULL;
2571 scsidp = sdp ? sdp->device : NULL;
2572 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
2573 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2574 scsidp->vendor, scsidp->model, scsidp->rev);
2575 else
2576 seq_puts(s, "<no active device>\n");
2577 read_unlock_irqrestore(&sg_index_lock, iflags);
2578 return 0;
2579 }
2580
2581 /* must be called while holding sg_index_lock */
2582 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2583 {
2584 int k, m, new_interface, blen, usg;
2585 Sg_request *srp;
2586 Sg_fd *fp;
2587 const sg_io_hdr_t *hp;
2588 const char * cp;
2589 unsigned int ms;
2590
2591 k = 0;
2592 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2593 k++;
2594 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2595 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2596 "(res)sgat=%d low_dma=%d\n", k,
2597 jiffies_to_msecs(fp->timeout),
2598 fp->reserve.bufflen,
2599 (int) fp->reserve.k_use_sg,
2600 (int) fp->low_dma);
2601 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2602 (int) fp->cmd_q, (int) fp->force_packid,
2603 (int) fp->keep_orphan);
2604 for (m = 0, srp = fp->headrp;
2605 srp != NULL;
2606 ++m, srp = srp->nextrp) {
2607 hp = &srp->header;
2608 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2609 if (srp->res_used) {
2610 if (new_interface &&
2611 (SG_FLAG_MMAP_IO & hp->flags))
2612 cp = " mmap>> ";
2613 else
2614 cp = " rb>> ";
2615 } else {
2616 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2617 cp = " dio>> ";
2618 else
2619 cp = " ";
2620 }
2621 seq_puts(s, cp);
2622 blen = srp->data.bufflen;
2623 usg = srp->data.k_use_sg;
2624 seq_puts(s, srp->done ?
2625 ((1 == srp->done) ? "rcv:" : "fin:")
2626 : "act:");
2627 seq_printf(s, " id=%d blen=%d",
2628 srp->header.pack_id, blen);
2629 if (srp->done)
2630 seq_printf(s, " dur=%d", hp->duration);
2631 else {
2632 ms = jiffies_to_msecs(jiffies);
2633 seq_printf(s, " t_o/elap=%d/%d",
2634 (new_interface ? hp->timeout :
2635 jiffies_to_msecs(fp->timeout)),
2636 (ms > hp->duration ? ms - hp->duration : 0));
2637 }
2638 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2639 (int) srp->data.cmd_opcode);
2640 }
2641 if (0 == m)
2642 seq_puts(s, " No requests active\n");
2643 read_unlock(&fp->rq_list_lock);
2644 }
2645 }
2646
2647 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2648 {
2649 return seq_open(file, &debug_seq_ops);
2650 }
2651
2652 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2653 {
2654 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2655 Sg_device *sdp;
2656 unsigned long iflags;
2657
2658 if (it && (0 == it->index))
2659 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2660 (int)it->max, sg_big_buff);
2661
2662 read_lock_irqsave(&sg_index_lock, iflags);
2663 sdp = it ? sg_lookup_dev(it->index) : NULL;
2664 if (NULL == sdp)
2665 goto skip;
2666 read_lock(&sdp->sfd_lock);
2667 if (!list_empty(&sdp->sfds)) {
2668 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2669 if (atomic_read(&sdp->detaching))
2670 seq_puts(s, "detaching pending close ");
2671 else if (sdp->device) {
2672 struct scsi_device *scsidp = sdp->device;
2673
2674 seq_printf(s, "%d:%d:%d:%llu em=%d",
2675 scsidp->host->host_no,
2676 scsidp->channel, scsidp->id,
2677 scsidp->lun,
2678 scsidp->host->hostt->emulated);
2679 }
2680 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2681 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
2682 sg_proc_debug_helper(s, sdp);
2683 }
2684 read_unlock(&sdp->sfd_lock);
2685 skip:
2686 read_unlock_irqrestore(&sg_index_lock, iflags);
2687 return 0;
2688 }
2689
2690 #endif /* CONFIG_SCSI_PROC_FS */
2691
2692 module_init(init_sg);
2693 module_exit(exit_sg);
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