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Merge tag 'usb-4.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[deliverable/linux.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/errno.h>
37 #include <linux/mtio.h>
38 #include <linux/ioctl.h>
39 #include <linux/slab.h>
40 #include <linux/fcntl.h>
41 #include <linux/init.h>
42 #include <linux/poll.h>
43 #include <linux/moduleparam.h>
44 #include <linux/cdev.h>
45 #include <linux/idr.h>
46 #include <linux/seq_file.h>
47 #include <linux/blkdev.h>
48 #include <linux/delay.h>
49 #include <linux/blktrace_api.h>
50 #include <linux/mutex.h>
51 #include <linux/atomic.h>
52 #include <linux/ratelimit.h>
53 #include <linux/uio.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_fd * sfp, 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);
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 #define sg_printk(prefix, sdp, fmt, a...) \
222 sdev_prefix_printk(prefix, (sdp)->device, \
223 (sdp)->disk->disk_name, fmt, ##a)
224
225 static int sg_allow_access(struct file *filp, unsigned char *cmd)
226 {
227 struct sg_fd *sfp = filp->private_data;
228
229 if (sfp->parentdp->device->type == TYPE_SCANNER)
230 return 0;
231
232 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
233 }
234
235 static int
236 open_wait(Sg_device *sdp, int flags)
237 {
238 int retval = 0;
239
240 if (flags & O_EXCL) {
241 while (sdp->open_cnt > 0) {
242 mutex_unlock(&sdp->open_rel_lock);
243 retval = wait_event_interruptible(sdp->open_wait,
244 (atomic_read(&sdp->detaching) ||
245 !sdp->open_cnt));
246 mutex_lock(&sdp->open_rel_lock);
247
248 if (retval) /* -ERESTARTSYS */
249 return retval;
250 if (atomic_read(&sdp->detaching))
251 return -ENODEV;
252 }
253 } else {
254 while (sdp->exclude) {
255 mutex_unlock(&sdp->open_rel_lock);
256 retval = wait_event_interruptible(sdp->open_wait,
257 (atomic_read(&sdp->detaching) ||
258 !sdp->exclude));
259 mutex_lock(&sdp->open_rel_lock);
260
261 if (retval) /* -ERESTARTSYS */
262 return retval;
263 if (atomic_read(&sdp->detaching))
264 return -ENODEV;
265 }
266 }
267
268 return retval;
269 }
270
271 /* Returns 0 on success, else a negated errno value */
272 static int
273 sg_open(struct inode *inode, struct file *filp)
274 {
275 int dev = iminor(inode);
276 int flags = filp->f_flags;
277 struct request_queue *q;
278 Sg_device *sdp;
279 Sg_fd *sfp;
280 int retval;
281
282 nonseekable_open(inode, filp);
283 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
284 return -EPERM; /* Can't lock it with read only access */
285 sdp = sg_get_dev(dev);
286 if (IS_ERR(sdp))
287 return PTR_ERR(sdp);
288
289 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
290 "sg_open: flags=0x%x\n", flags));
291
292 /* This driver's module count bumped by fops_get in <linux/fs.h> */
293 /* Prevent the device driver from vanishing while we sleep */
294 retval = scsi_device_get(sdp->device);
295 if (retval)
296 goto sg_put;
297
298 retval = scsi_autopm_get_device(sdp->device);
299 if (retval)
300 goto sdp_put;
301
302 /* scsi_block_when_processing_errors() may block so bypass
303 * check if O_NONBLOCK. Permits SCSI commands to be issued
304 * during error recovery. Tread carefully. */
305 if (!((flags & O_NONBLOCK) ||
306 scsi_block_when_processing_errors(sdp->device))) {
307 retval = -ENXIO;
308 /* we are in error recovery for this device */
309 goto error_out;
310 }
311
312 mutex_lock(&sdp->open_rel_lock);
313 if (flags & O_NONBLOCK) {
314 if (flags & O_EXCL) {
315 if (sdp->open_cnt > 0) {
316 retval = -EBUSY;
317 goto error_mutex_locked;
318 }
319 } else {
320 if (sdp->exclude) {
321 retval = -EBUSY;
322 goto error_mutex_locked;
323 }
324 }
325 } else {
326 retval = open_wait(sdp, flags);
327 if (retval) /* -ERESTARTSYS or -ENODEV */
328 goto error_mutex_locked;
329 }
330
331 /* N.B. at this point we are holding the open_rel_lock */
332 if (flags & O_EXCL)
333 sdp->exclude = true;
334
335 if (sdp->open_cnt < 1) { /* no existing opens */
336 sdp->sgdebug = 0;
337 q = sdp->device->request_queue;
338 sdp->sg_tablesize = queue_max_segments(q);
339 }
340 sfp = sg_add_sfp(sdp);
341 if (IS_ERR(sfp)) {
342 retval = PTR_ERR(sfp);
343 goto out_undo;
344 }
345
346 filp->private_data = sfp;
347 sdp->open_cnt++;
348 mutex_unlock(&sdp->open_rel_lock);
349
350 retval = 0;
351 sg_put:
352 kref_put(&sdp->d_ref, sg_device_destroy);
353 return retval;
354
355 out_undo:
356 if (flags & O_EXCL) {
357 sdp->exclude = false; /* undo if error */
358 wake_up_interruptible(&sdp->open_wait);
359 }
360 error_mutex_locked:
361 mutex_unlock(&sdp->open_rel_lock);
362 error_out:
363 scsi_autopm_put_device(sdp->device);
364 sdp_put:
365 scsi_device_put(sdp->device);
366 goto sg_put;
367 }
368
369 /* Release resources associated with a successful sg_open()
370 * Returns 0 on success, else a negated errno value */
371 static int
372 sg_release(struct inode *inode, struct file *filp)
373 {
374 Sg_device *sdp;
375 Sg_fd *sfp;
376
377 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
378 return -ENXIO;
379 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
380
381 mutex_lock(&sdp->open_rel_lock);
382 scsi_autopm_put_device(sdp->device);
383 kref_put(&sfp->f_ref, sg_remove_sfp);
384 sdp->open_cnt--;
385
386 /* possibly many open()s waiting on exlude clearing, start many;
387 * only open(O_EXCL)s wait on 0==open_cnt so only start one */
388 if (sdp->exclude) {
389 sdp->exclude = false;
390 wake_up_interruptible_all(&sdp->open_wait);
391 } else if (0 == sdp->open_cnt) {
392 wake_up_interruptible(&sdp->open_wait);
393 }
394 mutex_unlock(&sdp->open_rel_lock);
395 return 0;
396 }
397
398 static ssize_t
399 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
400 {
401 Sg_device *sdp;
402 Sg_fd *sfp;
403 Sg_request *srp;
404 int req_pack_id = -1;
405 sg_io_hdr_t *hp;
406 struct sg_header *old_hdr = NULL;
407 int retval = 0;
408
409 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
410 return -ENXIO;
411 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
412 "sg_read: count=%d\n", (int) count));
413
414 if (!access_ok(VERIFY_WRITE, buf, count))
415 return -EFAULT;
416 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
417 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
418 if (!old_hdr)
419 return -ENOMEM;
420 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
421 retval = -EFAULT;
422 goto free_old_hdr;
423 }
424 if (old_hdr->reply_len < 0) {
425 if (count >= SZ_SG_IO_HDR) {
426 sg_io_hdr_t *new_hdr;
427 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
428 if (!new_hdr) {
429 retval = -ENOMEM;
430 goto free_old_hdr;
431 }
432 retval =__copy_from_user
433 (new_hdr, buf, SZ_SG_IO_HDR);
434 req_pack_id = new_hdr->pack_id;
435 kfree(new_hdr);
436 if (retval) {
437 retval = -EFAULT;
438 goto free_old_hdr;
439 }
440 }
441 } else
442 req_pack_id = old_hdr->pack_id;
443 }
444 srp = sg_get_rq_mark(sfp, req_pack_id);
445 if (!srp) { /* now wait on packet to arrive */
446 if (atomic_read(&sdp->detaching)) {
447 retval = -ENODEV;
448 goto free_old_hdr;
449 }
450 if (filp->f_flags & O_NONBLOCK) {
451 retval = -EAGAIN;
452 goto free_old_hdr;
453 }
454 retval = wait_event_interruptible(sfp->read_wait,
455 (atomic_read(&sdp->detaching) ||
456 (srp = sg_get_rq_mark(sfp, req_pack_id))));
457 if (atomic_read(&sdp->detaching)) {
458 retval = -ENODEV;
459 goto free_old_hdr;
460 }
461 if (retval) {
462 /* -ERESTARTSYS as signal hit process */
463 goto free_old_hdr;
464 }
465 }
466 if (srp->header.interface_id != '\0') {
467 retval = sg_new_read(sfp, buf, count, srp);
468 goto free_old_hdr;
469 }
470
471 hp = &srp->header;
472 if (old_hdr == NULL) {
473 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
474 if (! old_hdr) {
475 retval = -ENOMEM;
476 goto free_old_hdr;
477 }
478 }
479 memset(old_hdr, 0, SZ_SG_HEADER);
480 old_hdr->reply_len = (int) hp->timeout;
481 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
482 old_hdr->pack_id = hp->pack_id;
483 old_hdr->twelve_byte =
484 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
485 old_hdr->target_status = hp->masked_status;
486 old_hdr->host_status = hp->host_status;
487 old_hdr->driver_status = hp->driver_status;
488 if ((CHECK_CONDITION & hp->masked_status) ||
489 (DRIVER_SENSE & hp->driver_status))
490 memcpy(old_hdr->sense_buffer, srp->sense_b,
491 sizeof (old_hdr->sense_buffer));
492 switch (hp->host_status) {
493 /* This setup of 'result' is for backward compatibility and is best
494 ignored by the user who should use target, host + driver status */
495 case DID_OK:
496 case DID_PASSTHROUGH:
497 case DID_SOFT_ERROR:
498 old_hdr->result = 0;
499 break;
500 case DID_NO_CONNECT:
501 case DID_BUS_BUSY:
502 case DID_TIME_OUT:
503 old_hdr->result = EBUSY;
504 break;
505 case DID_BAD_TARGET:
506 case DID_ABORT:
507 case DID_PARITY:
508 case DID_RESET:
509 case DID_BAD_INTR:
510 old_hdr->result = EIO;
511 break;
512 case DID_ERROR:
513 old_hdr->result = (srp->sense_b[0] == 0 &&
514 hp->masked_status == GOOD) ? 0 : EIO;
515 break;
516 default:
517 old_hdr->result = EIO;
518 break;
519 }
520
521 /* Now copy the result back to the user buffer. */
522 if (count >= SZ_SG_HEADER) {
523 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
524 retval = -EFAULT;
525 goto free_old_hdr;
526 }
527 buf += SZ_SG_HEADER;
528 if (count > old_hdr->reply_len)
529 count = old_hdr->reply_len;
530 if (count > SZ_SG_HEADER) {
531 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
532 retval = -EFAULT;
533 goto free_old_hdr;
534 }
535 }
536 } else
537 count = (old_hdr->result == 0) ? 0 : -EIO;
538 sg_finish_rem_req(srp);
539 retval = count;
540 free_old_hdr:
541 kfree(old_hdr);
542 return retval;
543 }
544
545 static ssize_t
546 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
547 {
548 sg_io_hdr_t *hp = &srp->header;
549 int err = 0, err2;
550 int len;
551
552 if (count < SZ_SG_IO_HDR) {
553 err = -EINVAL;
554 goto err_out;
555 }
556 hp->sb_len_wr = 0;
557 if ((hp->mx_sb_len > 0) && hp->sbp) {
558 if ((CHECK_CONDITION & hp->masked_status) ||
559 (DRIVER_SENSE & hp->driver_status)) {
560 int sb_len = SCSI_SENSE_BUFFERSIZE;
561 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
562 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
563 len = (len > sb_len) ? sb_len : len;
564 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
565 err = -EFAULT;
566 goto err_out;
567 }
568 hp->sb_len_wr = len;
569 }
570 }
571 if (hp->masked_status || hp->host_status || hp->driver_status)
572 hp->info |= SG_INFO_CHECK;
573 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
574 err = -EFAULT;
575 goto err_out;
576 }
577 err_out:
578 err2 = sg_finish_rem_req(srp);
579 return err ? : err2 ? : count;
580 }
581
582 static ssize_t
583 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
584 {
585 int mxsize, cmd_size, k;
586 int input_size, blocking;
587 unsigned char opcode;
588 Sg_device *sdp;
589 Sg_fd *sfp;
590 Sg_request *srp;
591 struct sg_header old_hdr;
592 sg_io_hdr_t *hp;
593 unsigned char cmnd[SG_MAX_CDB_SIZE];
594
595 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
596 return -ENXIO;
597 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
598 "sg_write: count=%d\n", (int) count));
599 if (atomic_read(&sdp->detaching))
600 return -ENODEV;
601 if (!((filp->f_flags & O_NONBLOCK) ||
602 scsi_block_when_processing_errors(sdp->device)))
603 return -ENXIO;
604
605 if (!access_ok(VERIFY_READ, buf, count))
606 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
607 if (count < SZ_SG_HEADER)
608 return -EIO;
609 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
610 return -EFAULT;
611 blocking = !(filp->f_flags & O_NONBLOCK);
612 if (old_hdr.reply_len < 0)
613 return sg_new_write(sfp, filp, buf, count,
614 blocking, 0, 0, NULL);
615 if (count < (SZ_SG_HEADER + 6))
616 return -EIO; /* The minimum scsi command length is 6 bytes. */
617
618 if (!(srp = sg_add_request(sfp))) {
619 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
620 "sg_write: queue full\n"));
621 return -EDOM;
622 }
623 buf += SZ_SG_HEADER;
624 __get_user(opcode, buf);
625 if (sfp->next_cmd_len > 0) {
626 cmd_size = sfp->next_cmd_len;
627 sfp->next_cmd_len = 0; /* reset so only this write() effected */
628 } else {
629 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
630 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
631 cmd_size = 12;
632 }
633 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
634 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
635 /* Determine buffer size. */
636 input_size = count - cmd_size;
637 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
638 mxsize -= SZ_SG_HEADER;
639 input_size -= SZ_SG_HEADER;
640 if (input_size < 0) {
641 sg_remove_request(sfp, srp);
642 return -EIO; /* User did not pass enough bytes for this command. */
643 }
644 hp = &srp->header;
645 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
646 hp->cmd_len = (unsigned char) cmd_size;
647 hp->iovec_count = 0;
648 hp->mx_sb_len = 0;
649 if (input_size > 0)
650 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
651 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
652 else
653 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
654 hp->dxfer_len = mxsize;
655 if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||
656 (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV))
657 hp->dxferp = (char __user *)buf + cmd_size;
658 else
659 hp->dxferp = NULL;
660 hp->sbp = NULL;
661 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
662 hp->flags = input_size; /* structure abuse ... */
663 hp->pack_id = old_hdr.pack_id;
664 hp->usr_ptr = NULL;
665 if (__copy_from_user(cmnd, buf, cmd_size))
666 return -EFAULT;
667 /*
668 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
669 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
670 * is a non-zero input_size, so emit a warning.
671 */
672 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
673 static char cmd[TASK_COMM_LEN];
674 if (strcmp(current->comm, cmd)) {
675 printk_ratelimited(KERN_WARNING
676 "sg_write: data in/out %d/%d bytes "
677 "for SCSI command 0x%x-- guessing "
678 "data in;\n program %s not setting "
679 "count and/or reply_len properly\n",
680 old_hdr.reply_len - (int)SZ_SG_HEADER,
681 input_size, (unsigned int) cmnd[0],
682 current->comm);
683 strcpy(cmd, current->comm);
684 }
685 }
686 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
687 return (k < 0) ? k : count;
688 }
689
690 static ssize_t
691 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
692 size_t count, int blocking, int read_only, int sg_io_owned,
693 Sg_request **o_srp)
694 {
695 int k;
696 Sg_request *srp;
697 sg_io_hdr_t *hp;
698 unsigned char cmnd[SG_MAX_CDB_SIZE];
699 int timeout;
700 unsigned long ul_timeout;
701
702 if (count < SZ_SG_IO_HDR)
703 return -EINVAL;
704 if (!access_ok(VERIFY_READ, buf, count))
705 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
706
707 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
708 if (!(srp = sg_add_request(sfp))) {
709 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
710 "sg_new_write: queue full\n"));
711 return -EDOM;
712 }
713 srp->sg_io_owned = sg_io_owned;
714 hp = &srp->header;
715 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
716 sg_remove_request(sfp, srp);
717 return -EFAULT;
718 }
719 if (hp->interface_id != 'S') {
720 sg_remove_request(sfp, srp);
721 return -ENOSYS;
722 }
723 if (hp->flags & SG_FLAG_MMAP_IO) {
724 if (hp->dxfer_len > sfp->reserve.bufflen) {
725 sg_remove_request(sfp, srp);
726 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
727 }
728 if (hp->flags & SG_FLAG_DIRECT_IO) {
729 sg_remove_request(sfp, srp);
730 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
731 }
732 if (sg_res_in_use(sfp)) {
733 sg_remove_request(sfp, srp);
734 return -EBUSY; /* reserve buffer already being used */
735 }
736 }
737 ul_timeout = msecs_to_jiffies(srp->header.timeout);
738 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
739 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
740 sg_remove_request(sfp, srp);
741 return -EMSGSIZE;
742 }
743 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
744 sg_remove_request(sfp, srp);
745 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
746 }
747 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
748 sg_remove_request(sfp, srp);
749 return -EFAULT;
750 }
751 if (read_only && sg_allow_access(file, cmnd)) {
752 sg_remove_request(sfp, srp);
753 return -EPERM;
754 }
755 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
756 if (k < 0)
757 return k;
758 if (o_srp)
759 *o_srp = srp;
760 return count;
761 }
762
763 static int
764 sg_common_write(Sg_fd * sfp, Sg_request * srp,
765 unsigned char *cmnd, int timeout, int blocking)
766 {
767 int k, at_head;
768 Sg_device *sdp = sfp->parentdp;
769 sg_io_hdr_t *hp = &srp->header;
770
771 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
772 hp->status = 0;
773 hp->masked_status = 0;
774 hp->msg_status = 0;
775 hp->info = 0;
776 hp->host_status = 0;
777 hp->driver_status = 0;
778 hp->resid = 0;
779 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
780 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
781 (int) cmnd[0], (int) hp->cmd_len));
782
783 k = sg_start_req(srp, cmnd);
784 if (k) {
785 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
786 "sg_common_write: start_req err=%d\n", k));
787 sg_finish_rem_req(srp);
788 return k; /* probably out of space --> ENOMEM */
789 }
790 if (atomic_read(&sdp->detaching)) {
791 if (srp->bio) {
792 if (srp->rq->cmd != srp->rq->__cmd)
793 kfree(srp->rq->cmd);
794
795 blk_end_request_all(srp->rq, -EIO);
796 srp->rq = NULL;
797 }
798
799 sg_finish_rem_req(srp);
800 return -ENODEV;
801 }
802
803 hp->duration = jiffies_to_msecs(jiffies);
804 if (hp->interface_id != '\0' && /* v3 (or later) interface */
805 (SG_FLAG_Q_AT_TAIL & hp->flags))
806 at_head = 0;
807 else
808 at_head = 1;
809
810 srp->rq->timeout = timeout;
811 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
812 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
813 srp->rq, at_head, sg_rq_end_io);
814 return 0;
815 }
816
817 static int srp_done(Sg_fd *sfp, Sg_request *srp)
818 {
819 unsigned long flags;
820 int ret;
821
822 read_lock_irqsave(&sfp->rq_list_lock, flags);
823 ret = srp->done;
824 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
825 return ret;
826 }
827
828 static int max_sectors_bytes(struct request_queue *q)
829 {
830 unsigned int max_sectors = queue_max_sectors(q);
831
832 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
833
834 return max_sectors << 9;
835 }
836
837 static long
838 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
839 {
840 void __user *p = (void __user *)arg;
841 int __user *ip = p;
842 int result, val, read_only;
843 Sg_device *sdp;
844 Sg_fd *sfp;
845 Sg_request *srp;
846 unsigned long iflags;
847
848 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
849 return -ENXIO;
850
851 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
852 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
853 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
854
855 switch (cmd_in) {
856 case SG_IO:
857 if (atomic_read(&sdp->detaching))
858 return -ENODEV;
859 if (!scsi_block_when_processing_errors(sdp->device))
860 return -ENXIO;
861 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
862 return -EFAULT;
863 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
864 1, read_only, 1, &srp);
865 if (result < 0)
866 return result;
867 result = wait_event_interruptible(sfp->read_wait,
868 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
869 if (atomic_read(&sdp->detaching))
870 return -ENODEV;
871 write_lock_irq(&sfp->rq_list_lock);
872 if (srp->done) {
873 srp->done = 2;
874 write_unlock_irq(&sfp->rq_list_lock);
875 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
876 return (result < 0) ? result : 0;
877 }
878 srp->orphan = 1;
879 write_unlock_irq(&sfp->rq_list_lock);
880 return result; /* -ERESTARTSYS because signal hit process */
881 case SG_SET_TIMEOUT:
882 result = get_user(val, ip);
883 if (result)
884 return result;
885 if (val < 0)
886 return -EIO;
887 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
888 val = MULDIV (INT_MAX, USER_HZ, HZ);
889 sfp->timeout_user = val;
890 sfp->timeout = MULDIV (val, HZ, USER_HZ);
891
892 return 0;
893 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
894 /* strange ..., for backward compatibility */
895 return sfp->timeout_user;
896 case SG_SET_FORCE_LOW_DMA:
897 result = get_user(val, ip);
898 if (result)
899 return result;
900 if (val) {
901 sfp->low_dma = 1;
902 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
903 val = (int) sfp->reserve.bufflen;
904 sg_remove_scat(sfp, &sfp->reserve);
905 sg_build_reserve(sfp, val);
906 }
907 } else {
908 if (atomic_read(&sdp->detaching))
909 return -ENODEV;
910 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
911 }
912 return 0;
913 case SG_GET_LOW_DMA:
914 return put_user((int) sfp->low_dma, ip);
915 case SG_GET_SCSI_ID:
916 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
917 return -EFAULT;
918 else {
919 sg_scsi_id_t __user *sg_idp = p;
920
921 if (atomic_read(&sdp->detaching))
922 return -ENODEV;
923 __put_user((int) sdp->device->host->host_no,
924 &sg_idp->host_no);
925 __put_user((int) sdp->device->channel,
926 &sg_idp->channel);
927 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
928 __put_user((int) sdp->device->lun, &sg_idp->lun);
929 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
930 __put_user((short) sdp->device->host->cmd_per_lun,
931 &sg_idp->h_cmd_per_lun);
932 __put_user((short) sdp->device->queue_depth,
933 &sg_idp->d_queue_depth);
934 __put_user(0, &sg_idp->unused[0]);
935 __put_user(0, &sg_idp->unused[1]);
936 return 0;
937 }
938 case SG_SET_FORCE_PACK_ID:
939 result = get_user(val, ip);
940 if (result)
941 return result;
942 sfp->force_packid = val ? 1 : 0;
943 return 0;
944 case SG_GET_PACK_ID:
945 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
946 return -EFAULT;
947 read_lock_irqsave(&sfp->rq_list_lock, iflags);
948 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
949 if ((1 == srp->done) && (!srp->sg_io_owned)) {
950 read_unlock_irqrestore(&sfp->rq_list_lock,
951 iflags);
952 __put_user(srp->header.pack_id, ip);
953 return 0;
954 }
955 }
956 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
957 __put_user(-1, ip);
958 return 0;
959 case SG_GET_NUM_WAITING:
960 read_lock_irqsave(&sfp->rq_list_lock, iflags);
961 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
962 if ((1 == srp->done) && (!srp->sg_io_owned))
963 ++val;
964 }
965 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
966 return put_user(val, ip);
967 case SG_GET_SG_TABLESIZE:
968 return put_user(sdp->sg_tablesize, ip);
969 case SG_SET_RESERVED_SIZE:
970 result = get_user(val, ip);
971 if (result)
972 return result;
973 if (val < 0)
974 return -EINVAL;
975 val = min_t(int, val,
976 max_sectors_bytes(sdp->device->request_queue));
977 if (val != sfp->reserve.bufflen) {
978 if (sg_res_in_use(sfp) || sfp->mmap_called)
979 return -EBUSY;
980 sg_remove_scat(sfp, &sfp->reserve);
981 sg_build_reserve(sfp, val);
982 }
983 return 0;
984 case SG_GET_RESERVED_SIZE:
985 val = min_t(int, sfp->reserve.bufflen,
986 max_sectors_bytes(sdp->device->request_queue));
987 return put_user(val, ip);
988 case SG_SET_COMMAND_Q:
989 result = get_user(val, ip);
990 if (result)
991 return result;
992 sfp->cmd_q = val ? 1 : 0;
993 return 0;
994 case SG_GET_COMMAND_Q:
995 return put_user((int) sfp->cmd_q, ip);
996 case SG_SET_KEEP_ORPHAN:
997 result = get_user(val, ip);
998 if (result)
999 return result;
1000 sfp->keep_orphan = val;
1001 return 0;
1002 case SG_GET_KEEP_ORPHAN:
1003 return put_user((int) sfp->keep_orphan, ip);
1004 case SG_NEXT_CMD_LEN:
1005 result = get_user(val, ip);
1006 if (result)
1007 return result;
1008 sfp->next_cmd_len = (val > 0) ? val : 0;
1009 return 0;
1010 case SG_GET_VERSION_NUM:
1011 return put_user(sg_version_num, ip);
1012 case SG_GET_ACCESS_COUNT:
1013 /* faked - we don't have a real access count anymore */
1014 val = (sdp->device ? 1 : 0);
1015 return put_user(val, ip);
1016 case SG_GET_REQUEST_TABLE:
1017 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1018 return -EFAULT;
1019 else {
1020 sg_req_info_t *rinfo;
1021 unsigned int ms;
1022
1023 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1024 GFP_KERNEL);
1025 if (!rinfo)
1026 return -ENOMEM;
1027 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1028 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1029 ++val, srp = srp ? srp->nextrp : srp) {
1030 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1031 if (srp) {
1032 rinfo[val].req_state = srp->done + 1;
1033 rinfo[val].problem =
1034 srp->header.masked_status &
1035 srp->header.host_status &
1036 srp->header.driver_status;
1037 if (srp->done)
1038 rinfo[val].duration =
1039 srp->header.duration;
1040 else {
1041 ms = jiffies_to_msecs(jiffies);
1042 rinfo[val].duration =
1043 (ms > srp->header.duration) ?
1044 (ms - srp->header.duration) : 0;
1045 }
1046 rinfo[val].orphan = srp->orphan;
1047 rinfo[val].sg_io_owned =
1048 srp->sg_io_owned;
1049 rinfo[val].pack_id =
1050 srp->header.pack_id;
1051 rinfo[val].usr_ptr =
1052 srp->header.usr_ptr;
1053 }
1054 }
1055 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1056 result = __copy_to_user(p, rinfo,
1057 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1058 result = result ? -EFAULT : 0;
1059 kfree(rinfo);
1060 return result;
1061 }
1062 case SG_EMULATED_HOST:
1063 if (atomic_read(&sdp->detaching))
1064 return -ENODEV;
1065 return put_user(sdp->device->host->hostt->emulated, ip);
1066 case SCSI_IOCTL_SEND_COMMAND:
1067 if (atomic_read(&sdp->detaching))
1068 return -ENODEV;
1069 if (read_only) {
1070 unsigned char opcode = WRITE_6;
1071 Scsi_Ioctl_Command __user *siocp = p;
1072
1073 if (copy_from_user(&opcode, siocp->data, 1))
1074 return -EFAULT;
1075 if (sg_allow_access(filp, &opcode))
1076 return -EPERM;
1077 }
1078 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1079 case SG_SET_DEBUG:
1080 result = get_user(val, ip);
1081 if (result)
1082 return result;
1083 sdp->sgdebug = (char) val;
1084 return 0;
1085 case BLKSECTGET:
1086 return put_user(max_sectors_bytes(sdp->device->request_queue),
1087 ip);
1088 case BLKTRACESETUP:
1089 return blk_trace_setup(sdp->device->request_queue,
1090 sdp->disk->disk_name,
1091 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1092 NULL,
1093 (char *)arg);
1094 case BLKTRACESTART:
1095 return blk_trace_startstop(sdp->device->request_queue, 1);
1096 case BLKTRACESTOP:
1097 return blk_trace_startstop(sdp->device->request_queue, 0);
1098 case BLKTRACETEARDOWN:
1099 return blk_trace_remove(sdp->device->request_queue);
1100 case SCSI_IOCTL_GET_IDLUN:
1101 case SCSI_IOCTL_GET_BUS_NUMBER:
1102 case SCSI_IOCTL_PROBE_HOST:
1103 case SG_GET_TRANSFORM:
1104 case SG_SCSI_RESET:
1105 if (atomic_read(&sdp->detaching))
1106 return -ENODEV;
1107 break;
1108 default:
1109 if (read_only)
1110 return -EPERM; /* don't know so take safe approach */
1111 break;
1112 }
1113
1114 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1115 cmd_in, filp->f_flags & O_NDELAY);
1116 if (result)
1117 return result;
1118 return scsi_ioctl(sdp->device, cmd_in, p);
1119 }
1120
1121 #ifdef CONFIG_COMPAT
1122 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1123 {
1124 Sg_device *sdp;
1125 Sg_fd *sfp;
1126 struct scsi_device *sdev;
1127
1128 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1129 return -ENXIO;
1130
1131 sdev = sdp->device;
1132 if (sdev->host->hostt->compat_ioctl) {
1133 int ret;
1134
1135 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1136
1137 return ret;
1138 }
1139
1140 return -ENOIOCTLCMD;
1141 }
1142 #endif
1143
1144 static unsigned int
1145 sg_poll(struct file *filp, poll_table * wait)
1146 {
1147 unsigned int res = 0;
1148 Sg_device *sdp;
1149 Sg_fd *sfp;
1150 Sg_request *srp;
1151 int count = 0;
1152 unsigned long iflags;
1153
1154 sfp = filp->private_data;
1155 if (!sfp)
1156 return POLLERR;
1157 sdp = sfp->parentdp;
1158 if (!sdp)
1159 return POLLERR;
1160 poll_wait(filp, &sfp->read_wait, wait);
1161 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1162 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1163 /* if any read waiting, flag it */
1164 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1165 res = POLLIN | POLLRDNORM;
1166 ++count;
1167 }
1168 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1169
1170 if (atomic_read(&sdp->detaching))
1171 res |= POLLHUP;
1172 else if (!sfp->cmd_q) {
1173 if (0 == count)
1174 res |= POLLOUT | POLLWRNORM;
1175 } else if (count < SG_MAX_QUEUE)
1176 res |= POLLOUT | POLLWRNORM;
1177 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1178 "sg_poll: res=0x%x\n", (int) res));
1179 return res;
1180 }
1181
1182 static int
1183 sg_fasync(int fd, struct file *filp, int mode)
1184 {
1185 Sg_device *sdp;
1186 Sg_fd *sfp;
1187
1188 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1189 return -ENXIO;
1190 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1191 "sg_fasync: mode=%d\n", mode));
1192
1193 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1194 }
1195
1196 static int
1197 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1198 {
1199 Sg_fd *sfp;
1200 unsigned long offset, len, sa;
1201 Sg_scatter_hold *rsv_schp;
1202 int k, length;
1203
1204 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1205 return VM_FAULT_SIGBUS;
1206 rsv_schp = &sfp->reserve;
1207 offset = vmf->pgoff << PAGE_SHIFT;
1208 if (offset >= rsv_schp->bufflen)
1209 return VM_FAULT_SIGBUS;
1210 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1211 "sg_vma_fault: offset=%lu, scatg=%d\n",
1212 offset, rsv_schp->k_use_sg));
1213 sa = vma->vm_start;
1214 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1215 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1216 len = vma->vm_end - sa;
1217 len = (len < length) ? len : length;
1218 if (offset < len) {
1219 struct page *page = nth_page(rsv_schp->pages[k],
1220 offset >> PAGE_SHIFT);
1221 get_page(page); /* increment page count */
1222 vmf->page = page;
1223 return 0; /* success */
1224 }
1225 sa += len;
1226 offset -= len;
1227 }
1228
1229 return VM_FAULT_SIGBUS;
1230 }
1231
1232 static const struct vm_operations_struct sg_mmap_vm_ops = {
1233 .fault = sg_vma_fault,
1234 };
1235
1236 static int
1237 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1238 {
1239 Sg_fd *sfp;
1240 unsigned long req_sz, len, sa;
1241 Sg_scatter_hold *rsv_schp;
1242 int k, length;
1243
1244 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1245 return -ENXIO;
1246 req_sz = vma->vm_end - vma->vm_start;
1247 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1248 "sg_mmap starting, vm_start=%p, len=%d\n",
1249 (void *) vma->vm_start, (int) req_sz));
1250 if (vma->vm_pgoff)
1251 return -EINVAL; /* want no offset */
1252 rsv_schp = &sfp->reserve;
1253 if (req_sz > rsv_schp->bufflen)
1254 return -ENOMEM; /* cannot map more than reserved buffer */
1255
1256 sa = vma->vm_start;
1257 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1258 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1259 len = vma->vm_end - sa;
1260 len = (len < length) ? len : length;
1261 sa += len;
1262 }
1263
1264 sfp->mmap_called = 1;
1265 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1266 vma->vm_private_data = sfp;
1267 vma->vm_ops = &sg_mmap_vm_ops;
1268 return 0;
1269 }
1270
1271 static void
1272 sg_rq_end_io_usercontext(struct work_struct *work)
1273 {
1274 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1275 struct sg_fd *sfp = srp->parentfp;
1276
1277 sg_finish_rem_req(srp);
1278 kref_put(&sfp->f_ref, sg_remove_sfp);
1279 }
1280
1281 /*
1282 * This function is a "bottom half" handler that is called by the mid
1283 * level when a command is completed (or has failed).
1284 */
1285 static void
1286 sg_rq_end_io(struct request *rq, int uptodate)
1287 {
1288 struct sg_request *srp = rq->end_io_data;
1289 Sg_device *sdp;
1290 Sg_fd *sfp;
1291 unsigned long iflags;
1292 unsigned int ms;
1293 char *sense;
1294 int result, resid, done = 1;
1295
1296 if (WARN_ON(srp->done != 0))
1297 return;
1298
1299 sfp = srp->parentfp;
1300 if (WARN_ON(sfp == NULL))
1301 return;
1302
1303 sdp = sfp->parentdp;
1304 if (unlikely(atomic_read(&sdp->detaching)))
1305 pr_info("%s: device detaching\n", __func__);
1306
1307 sense = rq->sense;
1308 result = rq->errors;
1309 resid = rq->resid_len;
1310
1311 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1312 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1313 srp->header.pack_id, result));
1314 srp->header.resid = resid;
1315 ms = jiffies_to_msecs(jiffies);
1316 srp->header.duration = (ms > srp->header.duration) ?
1317 (ms - srp->header.duration) : 0;
1318 if (0 != result) {
1319 struct scsi_sense_hdr sshdr;
1320
1321 srp->header.status = 0xff & result;
1322 srp->header.masked_status = status_byte(result);
1323 srp->header.msg_status = msg_byte(result);
1324 srp->header.host_status = host_byte(result);
1325 srp->header.driver_status = driver_byte(result);
1326 if ((sdp->sgdebug > 0) &&
1327 ((CHECK_CONDITION == srp->header.masked_status) ||
1328 (COMMAND_TERMINATED == srp->header.masked_status)))
1329 __scsi_print_sense(sdp->device, __func__, sense,
1330 SCSI_SENSE_BUFFERSIZE);
1331
1332 /* Following if statement is a patch supplied by Eric Youngdale */
1333 if (driver_byte(result) != 0
1334 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1335 && !scsi_sense_is_deferred(&sshdr)
1336 && sshdr.sense_key == UNIT_ATTENTION
1337 && sdp->device->removable) {
1338 /* Detected possible disc change. Set the bit - this */
1339 /* may be used if there are filesystems using this device */
1340 sdp->device->changed = 1;
1341 }
1342 }
1343 /* Rely on write phase to clean out srp status values, so no "else" */
1344
1345 /*
1346 * Free the request as soon as it is complete so that its resources
1347 * can be reused without waiting for userspace to read() the
1348 * result. But keep the associated bio (if any) around until
1349 * blk_rq_unmap_user() can be called from user context.
1350 */
1351 srp->rq = NULL;
1352 if (rq->cmd != rq->__cmd)
1353 kfree(rq->cmd);
1354 __blk_put_request(rq->q, rq);
1355
1356 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1357 if (unlikely(srp->orphan)) {
1358 if (sfp->keep_orphan)
1359 srp->sg_io_owned = 0;
1360 else
1361 done = 0;
1362 }
1363 srp->done = done;
1364 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1365
1366 if (likely(done)) {
1367 /* Now wake up any sg_read() that is waiting for this
1368 * packet.
1369 */
1370 wake_up_interruptible(&sfp->read_wait);
1371 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1372 kref_put(&sfp->f_ref, sg_remove_sfp);
1373 } else {
1374 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1375 schedule_work(&srp->ew.work);
1376 }
1377 }
1378
1379 static const struct file_operations sg_fops = {
1380 .owner = THIS_MODULE,
1381 .read = sg_read,
1382 .write = sg_write,
1383 .poll = sg_poll,
1384 .unlocked_ioctl = sg_ioctl,
1385 #ifdef CONFIG_COMPAT
1386 .compat_ioctl = sg_compat_ioctl,
1387 #endif
1388 .open = sg_open,
1389 .mmap = sg_mmap,
1390 .release = sg_release,
1391 .fasync = sg_fasync,
1392 .llseek = no_llseek,
1393 };
1394
1395 static struct class *sg_sysfs_class;
1396
1397 static int sg_sysfs_valid = 0;
1398
1399 static Sg_device *
1400 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1401 {
1402 struct request_queue *q = scsidp->request_queue;
1403 Sg_device *sdp;
1404 unsigned long iflags;
1405 int error;
1406 u32 k;
1407
1408 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1409 if (!sdp) {
1410 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1411 "failure\n", __func__);
1412 return ERR_PTR(-ENOMEM);
1413 }
1414
1415 idr_preload(GFP_KERNEL);
1416 write_lock_irqsave(&sg_index_lock, iflags);
1417
1418 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1419 if (error < 0) {
1420 if (error == -ENOSPC) {
1421 sdev_printk(KERN_WARNING, scsidp,
1422 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1423 scsidp->type, SG_MAX_DEVS - 1);
1424 error = -ENODEV;
1425 } else {
1426 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1427 "allocation Sg_device failure: %d\n",
1428 __func__, error);
1429 }
1430 goto out_unlock;
1431 }
1432 k = error;
1433
1434 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1435 "sg_alloc: dev=%d \n", k));
1436 sprintf(disk->disk_name, "sg%d", k);
1437 disk->first_minor = k;
1438 sdp->disk = disk;
1439 sdp->device = scsidp;
1440 mutex_init(&sdp->open_rel_lock);
1441 INIT_LIST_HEAD(&sdp->sfds);
1442 init_waitqueue_head(&sdp->open_wait);
1443 atomic_set(&sdp->detaching, 0);
1444 rwlock_init(&sdp->sfd_lock);
1445 sdp->sg_tablesize = queue_max_segments(q);
1446 sdp->index = k;
1447 kref_init(&sdp->d_ref);
1448 error = 0;
1449
1450 out_unlock:
1451 write_unlock_irqrestore(&sg_index_lock, iflags);
1452 idr_preload_end();
1453
1454 if (error) {
1455 kfree(sdp);
1456 return ERR_PTR(error);
1457 }
1458 return sdp;
1459 }
1460
1461 static int
1462 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1463 {
1464 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1465 struct gendisk *disk;
1466 Sg_device *sdp = NULL;
1467 struct cdev * cdev = NULL;
1468 int error;
1469 unsigned long iflags;
1470
1471 disk = alloc_disk(1);
1472 if (!disk) {
1473 pr_warn("%s: alloc_disk failed\n", __func__);
1474 return -ENOMEM;
1475 }
1476 disk->major = SCSI_GENERIC_MAJOR;
1477
1478 error = -ENOMEM;
1479 cdev = cdev_alloc();
1480 if (!cdev) {
1481 pr_warn("%s: cdev_alloc failed\n", __func__);
1482 goto out;
1483 }
1484 cdev->owner = THIS_MODULE;
1485 cdev->ops = &sg_fops;
1486
1487 sdp = sg_alloc(disk, scsidp);
1488 if (IS_ERR(sdp)) {
1489 pr_warn("%s: sg_alloc failed\n", __func__);
1490 error = PTR_ERR(sdp);
1491 goto out;
1492 }
1493
1494 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1495 if (error)
1496 goto cdev_add_err;
1497
1498 sdp->cdev = cdev;
1499 if (sg_sysfs_valid) {
1500 struct device *sg_class_member;
1501
1502 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1503 MKDEV(SCSI_GENERIC_MAJOR,
1504 sdp->index),
1505 sdp, "%s", disk->disk_name);
1506 if (IS_ERR(sg_class_member)) {
1507 pr_err("%s: device_create failed\n", __func__);
1508 error = PTR_ERR(sg_class_member);
1509 goto cdev_add_err;
1510 }
1511 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1512 &sg_class_member->kobj, "generic");
1513 if (error)
1514 pr_err("%s: unable to make symlink 'generic' back "
1515 "to sg%d\n", __func__, sdp->index);
1516 } else
1517 pr_warn("%s: sg_sys Invalid\n", __func__);
1518
1519 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1520 "type %d\n", sdp->index, scsidp->type);
1521
1522 dev_set_drvdata(cl_dev, sdp);
1523
1524 return 0;
1525
1526 cdev_add_err:
1527 write_lock_irqsave(&sg_index_lock, iflags);
1528 idr_remove(&sg_index_idr, sdp->index);
1529 write_unlock_irqrestore(&sg_index_lock, iflags);
1530 kfree(sdp);
1531
1532 out:
1533 put_disk(disk);
1534 if (cdev)
1535 cdev_del(cdev);
1536 return error;
1537 }
1538
1539 static void
1540 sg_device_destroy(struct kref *kref)
1541 {
1542 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1543 unsigned long flags;
1544
1545 /* CAUTION! Note that the device can still be found via idr_find()
1546 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1547 * any other cleanup.
1548 */
1549
1550 write_lock_irqsave(&sg_index_lock, flags);
1551 idr_remove(&sg_index_idr, sdp->index);
1552 write_unlock_irqrestore(&sg_index_lock, flags);
1553
1554 SCSI_LOG_TIMEOUT(3,
1555 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
1556
1557 put_disk(sdp->disk);
1558 kfree(sdp);
1559 }
1560
1561 static void
1562 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1563 {
1564 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1565 Sg_device *sdp = dev_get_drvdata(cl_dev);
1566 unsigned long iflags;
1567 Sg_fd *sfp;
1568 int val;
1569
1570 if (!sdp)
1571 return;
1572 /* want sdp->detaching non-zero as soon as possible */
1573 val = atomic_inc_return(&sdp->detaching);
1574 if (val > 1)
1575 return; /* only want to do following once per device */
1576
1577 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1578 "%s\n", __func__));
1579
1580 read_lock_irqsave(&sdp->sfd_lock, iflags);
1581 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1582 wake_up_interruptible_all(&sfp->read_wait);
1583 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1584 }
1585 wake_up_interruptible_all(&sdp->open_wait);
1586 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1587
1588 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1589 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1590 cdev_del(sdp->cdev);
1591 sdp->cdev = NULL;
1592
1593 kref_put(&sdp->d_ref, sg_device_destroy);
1594 }
1595
1596 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1597 module_param_named(def_reserved_size, def_reserved_size, int,
1598 S_IRUGO | S_IWUSR);
1599 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1600
1601 MODULE_AUTHOR("Douglas Gilbert");
1602 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1603 MODULE_LICENSE("GPL");
1604 MODULE_VERSION(SG_VERSION_STR);
1605 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1606
1607 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1608 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1609 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1610 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1611
1612 static int __init
1613 init_sg(void)
1614 {
1615 int rc;
1616
1617 if (scatter_elem_sz < PAGE_SIZE) {
1618 scatter_elem_sz = PAGE_SIZE;
1619 scatter_elem_sz_prev = scatter_elem_sz;
1620 }
1621 if (def_reserved_size >= 0)
1622 sg_big_buff = def_reserved_size;
1623 else
1624 def_reserved_size = sg_big_buff;
1625
1626 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1627 SG_MAX_DEVS, "sg");
1628 if (rc)
1629 return rc;
1630 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1631 if ( IS_ERR(sg_sysfs_class) ) {
1632 rc = PTR_ERR(sg_sysfs_class);
1633 goto err_out;
1634 }
1635 sg_sysfs_valid = 1;
1636 rc = scsi_register_interface(&sg_interface);
1637 if (0 == rc) {
1638 #ifdef CONFIG_SCSI_PROC_FS
1639 sg_proc_init();
1640 #endif /* CONFIG_SCSI_PROC_FS */
1641 return 0;
1642 }
1643 class_destroy(sg_sysfs_class);
1644 err_out:
1645 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1646 return rc;
1647 }
1648
1649 static void __exit
1650 exit_sg(void)
1651 {
1652 #ifdef CONFIG_SCSI_PROC_FS
1653 sg_proc_cleanup();
1654 #endif /* CONFIG_SCSI_PROC_FS */
1655 scsi_unregister_interface(&sg_interface);
1656 class_destroy(sg_sysfs_class);
1657 sg_sysfs_valid = 0;
1658 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1659 SG_MAX_DEVS);
1660 idr_destroy(&sg_index_idr);
1661 }
1662
1663 static int
1664 sg_start_req(Sg_request *srp, unsigned char *cmd)
1665 {
1666 int res;
1667 struct request *rq;
1668 Sg_fd *sfp = srp->parentfp;
1669 sg_io_hdr_t *hp = &srp->header;
1670 int dxfer_len = (int) hp->dxfer_len;
1671 int dxfer_dir = hp->dxfer_direction;
1672 unsigned int iov_count = hp->iovec_count;
1673 Sg_scatter_hold *req_schp = &srp->data;
1674 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1675 struct request_queue *q = sfp->parentdp->device->request_queue;
1676 struct rq_map_data *md, map_data;
1677 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1678 unsigned char *long_cmdp = NULL;
1679
1680 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1681 "sg_start_req: dxfer_len=%d\n",
1682 dxfer_len));
1683
1684 if (hp->cmd_len > BLK_MAX_CDB) {
1685 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1686 if (!long_cmdp)
1687 return -ENOMEM;
1688 }
1689
1690 /*
1691 * NOTE
1692 *
1693 * With scsi-mq enabled, there are a fixed number of preallocated
1694 * requests equal in number to shost->can_queue. If all of the
1695 * preallocated requests are already in use, then using GFP_ATOMIC with
1696 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1697 * will cause blk_get_request() to sleep until an active command
1698 * completes, freeing up a request. Neither option is ideal, but
1699 * GFP_KERNEL is the better choice to prevent userspace from getting an
1700 * unexpected EWOULDBLOCK.
1701 *
1702 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1703 * does not sleep except under memory pressure.
1704 */
1705 rq = blk_get_request(q, rw, GFP_KERNEL);
1706 if (IS_ERR(rq)) {
1707 kfree(long_cmdp);
1708 return PTR_ERR(rq);
1709 }
1710
1711 blk_rq_set_block_pc(rq);
1712
1713 if (hp->cmd_len > BLK_MAX_CDB)
1714 rq->cmd = long_cmdp;
1715 memcpy(rq->cmd, cmd, hp->cmd_len);
1716 rq->cmd_len = hp->cmd_len;
1717
1718 srp->rq = rq;
1719 rq->end_io_data = srp;
1720 rq->sense = srp->sense_b;
1721 rq->retries = SG_DEFAULT_RETRIES;
1722
1723 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1724 return 0;
1725
1726 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1727 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1728 !sfp->parentdp->device->host->unchecked_isa_dma &&
1729 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1730 md = NULL;
1731 else
1732 md = &map_data;
1733
1734 if (md) {
1735 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1736 sg_link_reserve(sfp, srp, dxfer_len);
1737 else {
1738 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1739 if (res)
1740 return res;
1741 }
1742
1743 md->pages = req_schp->pages;
1744 md->page_order = req_schp->page_order;
1745 md->nr_entries = req_schp->k_use_sg;
1746 md->offset = 0;
1747 md->null_mapped = hp->dxferp ? 0 : 1;
1748 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1749 md->from_user = 1;
1750 else
1751 md->from_user = 0;
1752 }
1753
1754 if (iov_count) {
1755 struct iovec *iov = NULL;
1756 struct iov_iter i;
1757
1758 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
1759 if (res < 0)
1760 return res;
1761
1762 iov_iter_truncate(&i, hp->dxfer_len);
1763
1764 res = blk_rq_map_user_iov(q, rq, md, &i, 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, sg_printk(KERN_INFO, sfp->parentdp,
1790 "sg_finish_rem_req: res_used=%d\n",
1791 (int) srp->res_used));
1792 if (srp->bio)
1793 ret = blk_rq_unmap_user(srp->bio);
1794
1795 if (srp->rq) {
1796 if (srp->rq->cmd != srp->rq->__cmd)
1797 kfree(srp->rq->cmd);
1798 blk_put_request(srp->rq);
1799 }
1800
1801 if (srp->res_used)
1802 sg_unlink_reserve(sfp, srp);
1803 else
1804 sg_remove_scat(sfp, req_schp);
1805
1806 sg_remove_request(sfp, srp);
1807
1808 return ret;
1809 }
1810
1811 static int
1812 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1813 {
1814 int sg_bufflen = tablesize * sizeof(struct page *);
1815 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1816
1817 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1818 if (!schp->pages)
1819 return -ENOMEM;
1820 schp->sglist_len = sg_bufflen;
1821 return tablesize; /* number of scat_gath elements allocated */
1822 }
1823
1824 static int
1825 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1826 {
1827 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1828 int sg_tablesize = sfp->parentdp->sg_tablesize;
1829 int blk_size = buff_size, order;
1830 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1831
1832 if (blk_size < 0)
1833 return -EFAULT;
1834 if (0 == blk_size)
1835 ++blk_size; /* don't know why */
1836 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1837 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1838 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1839 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1840 buff_size, blk_size));
1841
1842 /* N.B. ret_sz carried into this block ... */
1843 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1844 if (mx_sc_elems < 0)
1845 return mx_sc_elems; /* most likely -ENOMEM */
1846
1847 num = scatter_elem_sz;
1848 if (unlikely(num != scatter_elem_sz_prev)) {
1849 if (num < PAGE_SIZE) {
1850 scatter_elem_sz = PAGE_SIZE;
1851 scatter_elem_sz_prev = PAGE_SIZE;
1852 } else
1853 scatter_elem_sz_prev = num;
1854 }
1855
1856 if (sfp->low_dma)
1857 gfp_mask |= GFP_DMA;
1858
1859 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1860 gfp_mask |= __GFP_ZERO;
1861
1862 order = get_order(num);
1863 retry:
1864 ret_sz = 1 << (PAGE_SHIFT + order);
1865
1866 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1867 k++, rem_sz -= ret_sz) {
1868
1869 num = (rem_sz > scatter_elem_sz_prev) ?
1870 scatter_elem_sz_prev : rem_sz;
1871
1872 schp->pages[k] = alloc_pages(gfp_mask, order);
1873 if (!schp->pages[k])
1874 goto out;
1875
1876 if (num == scatter_elem_sz_prev) {
1877 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1878 scatter_elem_sz = ret_sz;
1879 scatter_elem_sz_prev = ret_sz;
1880 }
1881 }
1882
1883 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1884 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1885 k, num, ret_sz));
1886 } /* end of for loop */
1887
1888 schp->page_order = order;
1889 schp->k_use_sg = k;
1890 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1891 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1892 k, rem_sz));
1893
1894 schp->bufflen = blk_size;
1895 if (rem_sz > 0) /* must have failed */
1896 return -ENOMEM;
1897 return 0;
1898 out:
1899 for (i = 0; i < k; i++)
1900 __free_pages(schp->pages[i], order);
1901
1902 if (--order >= 0)
1903 goto retry;
1904
1905 return -ENOMEM;
1906 }
1907
1908 static void
1909 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1910 {
1911 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1912 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1913 if (schp->pages && schp->sglist_len > 0) {
1914 if (!schp->dio_in_use) {
1915 int k;
1916
1917 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1918 SCSI_LOG_TIMEOUT(5,
1919 sg_printk(KERN_INFO, sfp->parentdp,
1920 "sg_remove_scat: k=%d, pg=0x%p\n",
1921 k, schp->pages[k]));
1922 __free_pages(schp->pages[k], schp->page_order);
1923 }
1924
1925 kfree(schp->pages);
1926 }
1927 }
1928 memset(schp, 0, sizeof (*schp));
1929 }
1930
1931 static int
1932 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1933 {
1934 Sg_scatter_hold *schp = &srp->data;
1935 int k, num;
1936
1937 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1938 "sg_read_oxfer: num_read_xfer=%d\n",
1939 num_read_xfer));
1940 if ((!outp) || (num_read_xfer <= 0))
1941 return 0;
1942
1943 num = 1 << (PAGE_SHIFT + schp->page_order);
1944 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1945 if (num > num_read_xfer) {
1946 if (__copy_to_user(outp, page_address(schp->pages[k]),
1947 num_read_xfer))
1948 return -EFAULT;
1949 break;
1950 } else {
1951 if (__copy_to_user(outp, page_address(schp->pages[k]),
1952 num))
1953 return -EFAULT;
1954 num_read_xfer -= num;
1955 if (num_read_xfer <= 0)
1956 break;
1957 outp += num;
1958 }
1959 }
1960
1961 return 0;
1962 }
1963
1964 static void
1965 sg_build_reserve(Sg_fd * sfp, int req_size)
1966 {
1967 Sg_scatter_hold *schp = &sfp->reserve;
1968
1969 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1970 "sg_build_reserve: req_size=%d\n", req_size));
1971 do {
1972 if (req_size < PAGE_SIZE)
1973 req_size = PAGE_SIZE;
1974 if (0 == sg_build_indirect(schp, sfp, req_size))
1975 return;
1976 else
1977 sg_remove_scat(sfp, schp);
1978 req_size >>= 1; /* divide by 2 */
1979 } while (req_size > (PAGE_SIZE / 2));
1980 }
1981
1982 static void
1983 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1984 {
1985 Sg_scatter_hold *req_schp = &srp->data;
1986 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1987 int k, num, rem;
1988
1989 srp->res_used = 1;
1990 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1991 "sg_link_reserve: size=%d\n", size));
1992 rem = size;
1993
1994 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1995 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1996 if (rem <= num) {
1997 req_schp->k_use_sg = k + 1;
1998 req_schp->sglist_len = rsv_schp->sglist_len;
1999 req_schp->pages = rsv_schp->pages;
2000
2001 req_schp->bufflen = size;
2002 req_schp->page_order = rsv_schp->page_order;
2003 break;
2004 } else
2005 rem -= num;
2006 }
2007
2008 if (k >= rsv_schp->k_use_sg)
2009 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2010 "sg_link_reserve: BAD size\n"));
2011 }
2012
2013 static void
2014 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2015 {
2016 Sg_scatter_hold *req_schp = &srp->data;
2017
2018 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2019 "sg_unlink_reserve: req->k_use_sg=%d\n",
2020 (int) req_schp->k_use_sg));
2021 req_schp->k_use_sg = 0;
2022 req_schp->bufflen = 0;
2023 req_schp->pages = NULL;
2024 req_schp->page_order = 0;
2025 req_schp->sglist_len = 0;
2026 sfp->save_scat_len = 0;
2027 srp->res_used = 0;
2028 }
2029
2030 static Sg_request *
2031 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2032 {
2033 Sg_request *resp;
2034 unsigned long iflags;
2035
2036 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2037 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2038 /* look for requests that are ready + not SG_IO owned */
2039 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2040 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2041 resp->done = 2; /* guard against other readers */
2042 break;
2043 }
2044 }
2045 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2046 return resp;
2047 }
2048
2049 /* always adds to end of list */
2050 static Sg_request *
2051 sg_add_request(Sg_fd * sfp)
2052 {
2053 int k;
2054 unsigned long iflags;
2055 Sg_request *resp;
2056 Sg_request *rp = sfp->req_arr;
2057
2058 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2059 resp = sfp->headrp;
2060 if (!resp) {
2061 memset(rp, 0, sizeof (Sg_request));
2062 rp->parentfp = sfp;
2063 resp = rp;
2064 sfp->headrp = resp;
2065 } else {
2066 if (0 == sfp->cmd_q)
2067 resp = NULL; /* command queuing disallowed */
2068 else {
2069 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2070 if (!rp->parentfp)
2071 break;
2072 }
2073 if (k < SG_MAX_QUEUE) {
2074 memset(rp, 0, sizeof (Sg_request));
2075 rp->parentfp = sfp;
2076 while (resp->nextrp)
2077 resp = resp->nextrp;
2078 resp->nextrp = rp;
2079 resp = rp;
2080 } else
2081 resp = NULL;
2082 }
2083 }
2084 if (resp) {
2085 resp->nextrp = NULL;
2086 resp->header.duration = jiffies_to_msecs(jiffies);
2087 }
2088 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2089 return resp;
2090 }
2091
2092 /* Return of 1 for found; 0 for not found */
2093 static int
2094 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2095 {
2096 Sg_request *prev_rp;
2097 Sg_request *rp;
2098 unsigned long iflags;
2099 int res = 0;
2100
2101 if ((!sfp) || (!srp) || (!sfp->headrp))
2102 return res;
2103 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2104 prev_rp = sfp->headrp;
2105 if (srp == prev_rp) {
2106 sfp->headrp = prev_rp->nextrp;
2107 prev_rp->parentfp = NULL;
2108 res = 1;
2109 } else {
2110 while ((rp = prev_rp->nextrp)) {
2111 if (srp == rp) {
2112 prev_rp->nextrp = rp->nextrp;
2113 rp->parentfp = NULL;
2114 res = 1;
2115 break;
2116 }
2117 prev_rp = rp;
2118 }
2119 }
2120 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2121 return res;
2122 }
2123
2124 static Sg_fd *
2125 sg_add_sfp(Sg_device * sdp)
2126 {
2127 Sg_fd *sfp;
2128 unsigned long iflags;
2129 int bufflen;
2130
2131 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2132 if (!sfp)
2133 return ERR_PTR(-ENOMEM);
2134
2135 init_waitqueue_head(&sfp->read_wait);
2136 rwlock_init(&sfp->rq_list_lock);
2137
2138 kref_init(&sfp->f_ref);
2139 sfp->timeout = SG_DEFAULT_TIMEOUT;
2140 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2141 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2142 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2143 sdp->device->host->unchecked_isa_dma : 1;
2144 sfp->cmd_q = SG_DEF_COMMAND_Q;
2145 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2146 sfp->parentdp = sdp;
2147 write_lock_irqsave(&sdp->sfd_lock, iflags);
2148 if (atomic_read(&sdp->detaching)) {
2149 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2150 return ERR_PTR(-ENODEV);
2151 }
2152 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2153 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2154 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2155 "sg_add_sfp: sfp=0x%p\n", sfp));
2156 if (unlikely(sg_big_buff != def_reserved_size))
2157 sg_big_buff = def_reserved_size;
2158
2159 bufflen = min_t(int, sg_big_buff,
2160 max_sectors_bytes(sdp->device->request_queue));
2161 sg_build_reserve(sfp, bufflen);
2162 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2163 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2164 sfp->reserve.bufflen,
2165 sfp->reserve.k_use_sg));
2166
2167 kref_get(&sdp->d_ref);
2168 __module_get(THIS_MODULE);
2169 return sfp;
2170 }
2171
2172 static void
2173 sg_remove_sfp_usercontext(struct work_struct *work)
2174 {
2175 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2176 struct sg_device *sdp = sfp->parentdp;
2177
2178 /* Cleanup any responses which were never read(). */
2179 while (sfp->headrp)
2180 sg_finish_rem_req(sfp->headrp);
2181
2182 if (sfp->reserve.bufflen > 0) {
2183 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2184 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2185 (int) sfp->reserve.bufflen,
2186 (int) sfp->reserve.k_use_sg));
2187 sg_remove_scat(sfp, &sfp->reserve);
2188 }
2189
2190 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2191 "sg_remove_sfp: sfp=0x%p\n", sfp));
2192 kfree(sfp);
2193
2194 scsi_device_put(sdp->device);
2195 kref_put(&sdp->d_ref, sg_device_destroy);
2196 module_put(THIS_MODULE);
2197 }
2198
2199 static void
2200 sg_remove_sfp(struct kref *kref)
2201 {
2202 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2203 struct sg_device *sdp = sfp->parentdp;
2204 unsigned long iflags;
2205
2206 write_lock_irqsave(&sdp->sfd_lock, iflags);
2207 list_del(&sfp->sfd_siblings);
2208 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2209
2210 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2211 schedule_work(&sfp->ew.work);
2212 }
2213
2214 static int
2215 sg_res_in_use(Sg_fd * sfp)
2216 {
2217 const Sg_request *srp;
2218 unsigned long iflags;
2219
2220 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2221 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2222 if (srp->res_used)
2223 break;
2224 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2225 return srp ? 1 : 0;
2226 }
2227
2228 #ifdef CONFIG_SCSI_PROC_FS
2229 static int
2230 sg_idr_max_id(int id, void *p, void *data)
2231 {
2232 int *k = data;
2233
2234 if (*k < id)
2235 *k = id;
2236
2237 return 0;
2238 }
2239
2240 static int
2241 sg_last_dev(void)
2242 {
2243 int k = -1;
2244 unsigned long iflags;
2245
2246 read_lock_irqsave(&sg_index_lock, iflags);
2247 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2248 read_unlock_irqrestore(&sg_index_lock, iflags);
2249 return k + 1; /* origin 1 */
2250 }
2251 #endif
2252
2253 /* must be called with sg_index_lock held */
2254 static Sg_device *sg_lookup_dev(int dev)
2255 {
2256 return idr_find(&sg_index_idr, dev);
2257 }
2258
2259 static Sg_device *
2260 sg_get_dev(int dev)
2261 {
2262 struct sg_device *sdp;
2263 unsigned long flags;
2264
2265 read_lock_irqsave(&sg_index_lock, flags);
2266 sdp = sg_lookup_dev(dev);
2267 if (!sdp)
2268 sdp = ERR_PTR(-ENXIO);
2269 else if (atomic_read(&sdp->detaching)) {
2270 /* If sdp->detaching, then the refcount may already be 0, in
2271 * which case it would be a bug to do kref_get().
2272 */
2273 sdp = ERR_PTR(-ENODEV);
2274 } else
2275 kref_get(&sdp->d_ref);
2276 read_unlock_irqrestore(&sg_index_lock, flags);
2277
2278 return sdp;
2279 }
2280
2281 #ifdef CONFIG_SCSI_PROC_FS
2282
2283 static struct proc_dir_entry *sg_proc_sgp = NULL;
2284
2285 static char sg_proc_sg_dirname[] = "scsi/sg";
2286
2287 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2288
2289 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2290 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2291 size_t count, loff_t *off);
2292 static const struct file_operations adio_fops = {
2293 .owner = THIS_MODULE,
2294 .open = sg_proc_single_open_adio,
2295 .read = seq_read,
2296 .llseek = seq_lseek,
2297 .write = sg_proc_write_adio,
2298 .release = single_release,
2299 };
2300
2301 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2302 static ssize_t sg_proc_write_dressz(struct file *filp,
2303 const char __user *buffer, size_t count, loff_t *off);
2304 static const struct file_operations dressz_fops = {
2305 .owner = THIS_MODULE,
2306 .open = sg_proc_single_open_dressz,
2307 .read = seq_read,
2308 .llseek = seq_lseek,
2309 .write = sg_proc_write_dressz,
2310 .release = single_release,
2311 };
2312
2313 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2314 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2315 static const struct file_operations version_fops = {
2316 .owner = THIS_MODULE,
2317 .open = sg_proc_single_open_version,
2318 .read = seq_read,
2319 .llseek = seq_lseek,
2320 .release = single_release,
2321 };
2322
2323 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2324 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2325 static const struct file_operations devhdr_fops = {
2326 .owner = THIS_MODULE,
2327 .open = sg_proc_single_open_devhdr,
2328 .read = seq_read,
2329 .llseek = seq_lseek,
2330 .release = single_release,
2331 };
2332
2333 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2334 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2335 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2336 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2337 static void dev_seq_stop(struct seq_file *s, void *v);
2338 static const struct file_operations dev_fops = {
2339 .owner = THIS_MODULE,
2340 .open = sg_proc_open_dev,
2341 .read = seq_read,
2342 .llseek = seq_lseek,
2343 .release = seq_release,
2344 };
2345 static const struct seq_operations dev_seq_ops = {
2346 .start = dev_seq_start,
2347 .next = dev_seq_next,
2348 .stop = dev_seq_stop,
2349 .show = sg_proc_seq_show_dev,
2350 };
2351
2352 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2353 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2354 static const struct file_operations devstrs_fops = {
2355 .owner = THIS_MODULE,
2356 .open = sg_proc_open_devstrs,
2357 .read = seq_read,
2358 .llseek = seq_lseek,
2359 .release = seq_release,
2360 };
2361 static const struct seq_operations devstrs_seq_ops = {
2362 .start = dev_seq_start,
2363 .next = dev_seq_next,
2364 .stop = dev_seq_stop,
2365 .show = sg_proc_seq_show_devstrs,
2366 };
2367
2368 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2369 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2370 static const struct file_operations debug_fops = {
2371 .owner = THIS_MODULE,
2372 .open = sg_proc_open_debug,
2373 .read = seq_read,
2374 .llseek = seq_lseek,
2375 .release = seq_release,
2376 };
2377 static const struct seq_operations debug_seq_ops = {
2378 .start = dev_seq_start,
2379 .next = dev_seq_next,
2380 .stop = dev_seq_stop,
2381 .show = sg_proc_seq_show_debug,
2382 };
2383
2384
2385 struct sg_proc_leaf {
2386 const char * name;
2387 const struct file_operations * fops;
2388 };
2389
2390 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2391 {"allow_dio", &adio_fops},
2392 {"debug", &debug_fops},
2393 {"def_reserved_size", &dressz_fops},
2394 {"device_hdr", &devhdr_fops},
2395 {"devices", &dev_fops},
2396 {"device_strs", &devstrs_fops},
2397 {"version", &version_fops}
2398 };
2399
2400 static int
2401 sg_proc_init(void)
2402 {
2403 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2404 int k;
2405
2406 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2407 if (!sg_proc_sgp)
2408 return 1;
2409 for (k = 0; k < num_leaves; ++k) {
2410 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2411 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2412 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2413 }
2414 return 0;
2415 }
2416
2417 static void
2418 sg_proc_cleanup(void)
2419 {
2420 int k;
2421 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2422
2423 if (!sg_proc_sgp)
2424 return;
2425 for (k = 0; k < num_leaves; ++k)
2426 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2427 remove_proc_entry(sg_proc_sg_dirname, NULL);
2428 }
2429
2430
2431 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2432 {
2433 seq_printf(s, "%d\n", *((int *)s->private));
2434 return 0;
2435 }
2436
2437 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2438 {
2439 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2440 }
2441
2442 static ssize_t
2443 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2444 size_t count, loff_t *off)
2445 {
2446 int err;
2447 unsigned long num;
2448
2449 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2450 return -EACCES;
2451 err = kstrtoul_from_user(buffer, count, 0, &num);
2452 if (err)
2453 return err;
2454 sg_allow_dio = num ? 1 : 0;
2455 return count;
2456 }
2457
2458 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2459 {
2460 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2461 }
2462
2463 static ssize_t
2464 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2465 size_t count, loff_t *off)
2466 {
2467 int err;
2468 unsigned long k = ULONG_MAX;
2469
2470 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2471 return -EACCES;
2472
2473 err = kstrtoul_from_user(buffer, count, 0, &k);
2474 if (err)
2475 return err;
2476 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2477 sg_big_buff = k;
2478 return count;
2479 }
2480 return -ERANGE;
2481 }
2482
2483 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2484 {
2485 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2486 sg_version_date);
2487 return 0;
2488 }
2489
2490 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2491 {
2492 return single_open(file, sg_proc_seq_show_version, NULL);
2493 }
2494
2495 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2496 {
2497 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
2498 return 0;
2499 }
2500
2501 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2502 {
2503 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2504 }
2505
2506 struct sg_proc_deviter {
2507 loff_t index;
2508 size_t max;
2509 };
2510
2511 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2512 {
2513 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2514
2515 s->private = it;
2516 if (! it)
2517 return NULL;
2518
2519 it->index = *pos;
2520 it->max = sg_last_dev();
2521 if (it->index >= it->max)
2522 return NULL;
2523 return it;
2524 }
2525
2526 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2527 {
2528 struct sg_proc_deviter * it = s->private;
2529
2530 *pos = ++it->index;
2531 return (it->index < it->max) ? it : NULL;
2532 }
2533
2534 static void dev_seq_stop(struct seq_file *s, void *v)
2535 {
2536 kfree(s->private);
2537 }
2538
2539 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2540 {
2541 return seq_open(file, &dev_seq_ops);
2542 }
2543
2544 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2545 {
2546 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2547 Sg_device *sdp;
2548 struct scsi_device *scsidp;
2549 unsigned long iflags;
2550
2551 read_lock_irqsave(&sg_index_lock, iflags);
2552 sdp = it ? sg_lookup_dev(it->index) : NULL;
2553 if ((NULL == sdp) || (NULL == sdp->device) ||
2554 (atomic_read(&sdp->detaching)))
2555 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2556 else {
2557 scsidp = sdp->device;
2558 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
2559 scsidp->host->host_no, scsidp->channel,
2560 scsidp->id, scsidp->lun, (int) scsidp->type,
2561 1,
2562 (int) scsidp->queue_depth,
2563 (int) atomic_read(&scsidp->device_busy),
2564 (int) scsi_device_online(scsidp));
2565 }
2566 read_unlock_irqrestore(&sg_index_lock, iflags);
2567 return 0;
2568 }
2569
2570 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2571 {
2572 return seq_open(file, &devstrs_seq_ops);
2573 }
2574
2575 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2576 {
2577 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2578 Sg_device *sdp;
2579 struct scsi_device *scsidp;
2580 unsigned long iflags;
2581
2582 read_lock_irqsave(&sg_index_lock, iflags);
2583 sdp = it ? sg_lookup_dev(it->index) : NULL;
2584 scsidp = sdp ? sdp->device : NULL;
2585 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
2586 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2587 scsidp->vendor, scsidp->model, scsidp->rev);
2588 else
2589 seq_puts(s, "<no active device>\n");
2590 read_unlock_irqrestore(&sg_index_lock, iflags);
2591 return 0;
2592 }
2593
2594 /* must be called while holding sg_index_lock */
2595 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2596 {
2597 int k, m, new_interface, blen, usg;
2598 Sg_request *srp;
2599 Sg_fd *fp;
2600 const sg_io_hdr_t *hp;
2601 const char * cp;
2602 unsigned int ms;
2603
2604 k = 0;
2605 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2606 k++;
2607 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2608 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2609 "(res)sgat=%d low_dma=%d\n", k,
2610 jiffies_to_msecs(fp->timeout),
2611 fp->reserve.bufflen,
2612 (int) fp->reserve.k_use_sg,
2613 (int) fp->low_dma);
2614 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2615 (int) fp->cmd_q, (int) fp->force_packid,
2616 (int) fp->keep_orphan);
2617 for (m = 0, srp = fp->headrp;
2618 srp != NULL;
2619 ++m, srp = srp->nextrp) {
2620 hp = &srp->header;
2621 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2622 if (srp->res_used) {
2623 if (new_interface &&
2624 (SG_FLAG_MMAP_IO & hp->flags))
2625 cp = " mmap>> ";
2626 else
2627 cp = " rb>> ";
2628 } else {
2629 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2630 cp = " dio>> ";
2631 else
2632 cp = " ";
2633 }
2634 seq_puts(s, cp);
2635 blen = srp->data.bufflen;
2636 usg = srp->data.k_use_sg;
2637 seq_puts(s, srp->done ?
2638 ((1 == srp->done) ? "rcv:" : "fin:")
2639 : "act:");
2640 seq_printf(s, " id=%d blen=%d",
2641 srp->header.pack_id, blen);
2642 if (srp->done)
2643 seq_printf(s, " dur=%d", hp->duration);
2644 else {
2645 ms = jiffies_to_msecs(jiffies);
2646 seq_printf(s, " t_o/elap=%d/%d",
2647 (new_interface ? hp->timeout :
2648 jiffies_to_msecs(fp->timeout)),
2649 (ms > hp->duration ? ms - hp->duration : 0));
2650 }
2651 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2652 (int) srp->data.cmd_opcode);
2653 }
2654 if (0 == m)
2655 seq_puts(s, " No requests active\n");
2656 read_unlock(&fp->rq_list_lock);
2657 }
2658 }
2659
2660 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2661 {
2662 return seq_open(file, &debug_seq_ops);
2663 }
2664
2665 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2666 {
2667 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2668 Sg_device *sdp;
2669 unsigned long iflags;
2670
2671 if (it && (0 == it->index))
2672 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2673 (int)it->max, sg_big_buff);
2674
2675 read_lock_irqsave(&sg_index_lock, iflags);
2676 sdp = it ? sg_lookup_dev(it->index) : NULL;
2677 if (NULL == sdp)
2678 goto skip;
2679 read_lock(&sdp->sfd_lock);
2680 if (!list_empty(&sdp->sfds)) {
2681 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2682 if (atomic_read(&sdp->detaching))
2683 seq_puts(s, "detaching pending close ");
2684 else if (sdp->device) {
2685 struct scsi_device *scsidp = sdp->device;
2686
2687 seq_printf(s, "%d:%d:%d:%llu em=%d",
2688 scsidp->host->host_no,
2689 scsidp->channel, scsidp->id,
2690 scsidp->lun,
2691 scsidp->host->hostt->emulated);
2692 }
2693 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2694 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
2695 sg_proc_debug_helper(s, sdp);
2696 }
2697 read_unlock(&sdp->sfd_lock);
2698 skip:
2699 read_unlock_irqrestore(&sg_index_lock, iflags);
2700 return 0;
2701 }
2702
2703 #endif /* CONFIG_SCSI_PROC_FS */
2704
2705 module_init(init_sg);
2706 module_exit(exit_sg);
Linux kernel - Deliverables
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