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Merge tag 'pci-v4.12-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[GitHub/LineageOS/android_kernel_motorola_exynos9610.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 #define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
83
84 int sg_big_buff = SG_DEF_RESERVED_SIZE;
85 /* N.B. This variable is readable and writeable via
86 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
87 of this size (or less if there is not enough memory) will be reserved
88 for use by this file descriptor. [Deprecated usage: this variable is also
89 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
90 the kernel (i.e. it is not a module).] */
91 static int def_reserved_size = -1; /* picks up init parameter */
92 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
93
94 static int scatter_elem_sz = SG_SCATTER_SZ;
95 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
96
97 #define SG_SECTOR_SZ 512
98
99 static int sg_add_device(struct device *, struct class_interface *);
100 static void sg_remove_device(struct device *, struct class_interface *);
101
102 static DEFINE_IDR(sg_index_idr);
103 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
104 file descriptor list for device */
105
106 static struct class_interface sg_interface = {
107 .add_dev = sg_add_device,
108 .remove_dev = sg_remove_device,
109 };
110
111 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
112 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
113 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
114 unsigned bufflen; /* Size of (aggregate) data buffer */
115 struct page **pages;
116 int page_order;
117 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
118 unsigned char cmd_opcode; /* first byte of command */
119 } Sg_scatter_hold;
120
121 struct sg_device; /* forward declarations */
122 struct sg_fd;
123
124 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
125 struct list_head entry; /* list entry */
126 struct sg_fd *parentfp; /* NULL -> not in use */
127 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
128 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
129 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
130 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
131 char orphan; /* 1 -> drop on sight, 0 -> normal */
132 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
133 /* done protected by rq_list_lock */
134 char done; /* 0->before bh, 1->before read, 2->read */
135 struct request *rq;
136 struct bio *bio;
137 struct execute_work ew;
138 } Sg_request;
139
140 typedef struct sg_fd { /* holds the state of a file descriptor */
141 struct list_head sfd_siblings; /* protected by device's sfd_lock */
142 struct sg_device *parentdp; /* owning device */
143 wait_queue_head_t read_wait; /* queue read until command done */
144 rwlock_t rq_list_lock; /* protect access to list in req_arr */
145 struct mutex f_mutex; /* protect against changes in this fd */
146 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
147 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
148 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
149 struct list_head rq_list; /* head of request list */
150 struct fasync_struct *async_qp; /* used by asynchronous notification */
151 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
152 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
153 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
154 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */
155 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
156 char mmap_called; /* 0 -> mmap() never called on this fd */
157 char res_in_use; /* 1 -> 'reserve' array in use */
158 struct kref f_ref;
159 struct execute_work ew;
160 } Sg_fd;
161
162 typedef struct sg_device { /* holds the state of each scsi generic device */
163 struct scsi_device *device;
164 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */
165 struct mutex open_rel_lock; /* held when in open() or release() */
166 int sg_tablesize; /* adapter's max scatter-gather table size */
167 u32 index; /* device index number */
168 struct list_head sfds;
169 rwlock_t sfd_lock; /* protect access to sfd list */
170 atomic_t detaching; /* 0->device usable, 1->device detaching */
171 bool exclude; /* 1->open(O_EXCL) succeeded and is active */
172 int open_cnt; /* count of opens (perhaps < num(sfds) ) */
173 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
174 struct gendisk *disk;
175 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
176 struct kref d_ref;
177 } Sg_device;
178
179 /* tasklet or soft irq callback */
180 static void sg_rq_end_io(struct request *rq, int uptodate);
181 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
182 static int sg_finish_rem_req(Sg_request * srp);
183 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
184 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
185 Sg_request * srp);
186 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
187 const char __user *buf, size_t count, int blocking,
188 int read_only, int sg_io_owned, Sg_request **o_srp);
189 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
190 unsigned char *cmnd, int timeout, int blocking);
191 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
192 static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp);
193 static void sg_build_reserve(Sg_fd * sfp, int req_size);
194 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
195 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
196 static Sg_fd *sg_add_sfp(Sg_device * sdp);
197 static void sg_remove_sfp(struct kref *);
198 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
199 static Sg_request *sg_add_request(Sg_fd * sfp);
200 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
201 static Sg_device *sg_get_dev(int dev);
202 static void sg_device_destroy(struct kref *kref);
203
204 #define SZ_SG_HEADER sizeof(struct sg_header)
205 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
206 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
207 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
208
209 #define sg_printk(prefix, sdp, fmt, a...) \
210 sdev_prefix_printk(prefix, (sdp)->device, \
211 (sdp)->disk->disk_name, fmt, ##a)
212
213 static int sg_allow_access(struct file *filp, unsigned char *cmd)
214 {
215 struct sg_fd *sfp = filp->private_data;
216
217 if (sfp->parentdp->device->type == TYPE_SCANNER)
218 return 0;
219
220 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
221 }
222
223 static int
224 open_wait(Sg_device *sdp, int flags)
225 {
226 int retval = 0;
227
228 if (flags & O_EXCL) {
229 while (sdp->open_cnt > 0) {
230 mutex_unlock(&sdp->open_rel_lock);
231 retval = wait_event_interruptible(sdp->open_wait,
232 (atomic_read(&sdp->detaching) ||
233 !sdp->open_cnt));
234 mutex_lock(&sdp->open_rel_lock);
235
236 if (retval) /* -ERESTARTSYS */
237 return retval;
238 if (atomic_read(&sdp->detaching))
239 return -ENODEV;
240 }
241 } else {
242 while (sdp->exclude) {
243 mutex_unlock(&sdp->open_rel_lock);
244 retval = wait_event_interruptible(sdp->open_wait,
245 (atomic_read(&sdp->detaching) ||
246 !sdp->exclude));
247 mutex_lock(&sdp->open_rel_lock);
248
249 if (retval) /* -ERESTARTSYS */
250 return retval;
251 if (atomic_read(&sdp->detaching))
252 return -ENODEV;
253 }
254 }
255
256 return retval;
257 }
258
259 /* Returns 0 on success, else a negated errno value */
260 static int
261 sg_open(struct inode *inode, struct file *filp)
262 {
263 int dev = iminor(inode);
264 int flags = filp->f_flags;
265 struct request_queue *q;
266 Sg_device *sdp;
267 Sg_fd *sfp;
268 int retval;
269
270 nonseekable_open(inode, filp);
271 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
272 return -EPERM; /* Can't lock it with read only access */
273 sdp = sg_get_dev(dev);
274 if (IS_ERR(sdp))
275 return PTR_ERR(sdp);
276
277 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
278 "sg_open: flags=0x%x\n", flags));
279
280 /* This driver's module count bumped by fops_get in <linux/fs.h> */
281 /* Prevent the device driver from vanishing while we sleep */
282 retval = scsi_device_get(sdp->device);
283 if (retval)
284 goto sg_put;
285
286 retval = scsi_autopm_get_device(sdp->device);
287 if (retval)
288 goto sdp_put;
289
290 /* scsi_block_when_processing_errors() may block so bypass
291 * check if O_NONBLOCK. Permits SCSI commands to be issued
292 * during error recovery. Tread carefully. */
293 if (!((flags & O_NONBLOCK) ||
294 scsi_block_when_processing_errors(sdp->device))) {
295 retval = -ENXIO;
296 /* we are in error recovery for this device */
297 goto error_out;
298 }
299
300 mutex_lock(&sdp->open_rel_lock);
301 if (flags & O_NONBLOCK) {
302 if (flags & O_EXCL) {
303 if (sdp->open_cnt > 0) {
304 retval = -EBUSY;
305 goto error_mutex_locked;
306 }
307 } else {
308 if (sdp->exclude) {
309 retval = -EBUSY;
310 goto error_mutex_locked;
311 }
312 }
313 } else {
314 retval = open_wait(sdp, flags);
315 if (retval) /* -ERESTARTSYS or -ENODEV */
316 goto error_mutex_locked;
317 }
318
319 /* N.B. at this point we are holding the open_rel_lock */
320 if (flags & O_EXCL)
321 sdp->exclude = true;
322
323 if (sdp->open_cnt < 1) { /* no existing opens */
324 sdp->sgdebug = 0;
325 q = sdp->device->request_queue;
326 sdp->sg_tablesize = queue_max_segments(q);
327 }
328 sfp = sg_add_sfp(sdp);
329 if (IS_ERR(sfp)) {
330 retval = PTR_ERR(sfp);
331 goto out_undo;
332 }
333
334 filp->private_data = sfp;
335 sdp->open_cnt++;
336 mutex_unlock(&sdp->open_rel_lock);
337
338 retval = 0;
339 sg_put:
340 kref_put(&sdp->d_ref, sg_device_destroy);
341 return retval;
342
343 out_undo:
344 if (flags & O_EXCL) {
345 sdp->exclude = false; /* undo if error */
346 wake_up_interruptible(&sdp->open_wait);
347 }
348 error_mutex_locked:
349 mutex_unlock(&sdp->open_rel_lock);
350 error_out:
351 scsi_autopm_put_device(sdp->device);
352 sdp_put:
353 scsi_device_put(sdp->device);
354 goto sg_put;
355 }
356
357 /* Release resources associated with a successful sg_open()
358 * Returns 0 on success, else a negated errno value */
359 static int
360 sg_release(struct inode *inode, struct file *filp)
361 {
362 Sg_device *sdp;
363 Sg_fd *sfp;
364
365 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
366 return -ENXIO;
367 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
368
369 mutex_lock(&sdp->open_rel_lock);
370 scsi_autopm_put_device(sdp->device);
371 kref_put(&sfp->f_ref, sg_remove_sfp);
372 sdp->open_cnt--;
373
374 /* possibly many open()s waiting on exlude clearing, start many;
375 * only open(O_EXCL)s wait on 0==open_cnt so only start one */
376 if (sdp->exclude) {
377 sdp->exclude = false;
378 wake_up_interruptible_all(&sdp->open_wait);
379 } else if (0 == sdp->open_cnt) {
380 wake_up_interruptible(&sdp->open_wait);
381 }
382 mutex_unlock(&sdp->open_rel_lock);
383 return 0;
384 }
385
386 static ssize_t
387 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
388 {
389 Sg_device *sdp;
390 Sg_fd *sfp;
391 Sg_request *srp;
392 int req_pack_id = -1;
393 sg_io_hdr_t *hp;
394 struct sg_header *old_hdr = NULL;
395 int retval = 0;
396
397 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
398 return -ENXIO;
399 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
400 "sg_read: count=%d\n", (int) count));
401
402 if (!access_ok(VERIFY_WRITE, buf, count))
403 return -EFAULT;
404 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
405 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
406 if (!old_hdr)
407 return -ENOMEM;
408 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
409 retval = -EFAULT;
410 goto free_old_hdr;
411 }
412 if (old_hdr->reply_len < 0) {
413 if (count >= SZ_SG_IO_HDR) {
414 sg_io_hdr_t *new_hdr;
415 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
416 if (!new_hdr) {
417 retval = -ENOMEM;
418 goto free_old_hdr;
419 }
420 retval =__copy_from_user
421 (new_hdr, buf, SZ_SG_IO_HDR);
422 req_pack_id = new_hdr->pack_id;
423 kfree(new_hdr);
424 if (retval) {
425 retval = -EFAULT;
426 goto free_old_hdr;
427 }
428 }
429 } else
430 req_pack_id = old_hdr->pack_id;
431 }
432 srp = sg_get_rq_mark(sfp, req_pack_id);
433 if (!srp) { /* now wait on packet to arrive */
434 if (atomic_read(&sdp->detaching)) {
435 retval = -ENODEV;
436 goto free_old_hdr;
437 }
438 if (filp->f_flags & O_NONBLOCK) {
439 retval = -EAGAIN;
440 goto free_old_hdr;
441 }
442 retval = wait_event_interruptible(sfp->read_wait,
443 (atomic_read(&sdp->detaching) ||
444 (srp = sg_get_rq_mark(sfp, req_pack_id))));
445 if (atomic_read(&sdp->detaching)) {
446 retval = -ENODEV;
447 goto free_old_hdr;
448 }
449 if (retval) {
450 /* -ERESTARTSYS as signal hit process */
451 goto free_old_hdr;
452 }
453 }
454 if (srp->header.interface_id != '\0') {
455 retval = sg_new_read(sfp, buf, count, srp);
456 goto free_old_hdr;
457 }
458
459 hp = &srp->header;
460 if (old_hdr == NULL) {
461 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
462 if (! old_hdr) {
463 retval = -ENOMEM;
464 goto free_old_hdr;
465 }
466 }
467 memset(old_hdr, 0, SZ_SG_HEADER);
468 old_hdr->reply_len = (int) hp->timeout;
469 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
470 old_hdr->pack_id = hp->pack_id;
471 old_hdr->twelve_byte =
472 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
473 old_hdr->target_status = hp->masked_status;
474 old_hdr->host_status = hp->host_status;
475 old_hdr->driver_status = hp->driver_status;
476 if ((CHECK_CONDITION & hp->masked_status) ||
477 (DRIVER_SENSE & hp->driver_status))
478 memcpy(old_hdr->sense_buffer, srp->sense_b,
479 sizeof (old_hdr->sense_buffer));
480 switch (hp->host_status) {
481 /* This setup of 'result' is for backward compatibility and is best
482 ignored by the user who should use target, host + driver status */
483 case DID_OK:
484 case DID_PASSTHROUGH:
485 case DID_SOFT_ERROR:
486 old_hdr->result = 0;
487 break;
488 case DID_NO_CONNECT:
489 case DID_BUS_BUSY:
490 case DID_TIME_OUT:
491 old_hdr->result = EBUSY;
492 break;
493 case DID_BAD_TARGET:
494 case DID_ABORT:
495 case DID_PARITY:
496 case DID_RESET:
497 case DID_BAD_INTR:
498 old_hdr->result = EIO;
499 break;
500 case DID_ERROR:
501 old_hdr->result = (srp->sense_b[0] == 0 &&
502 hp->masked_status == GOOD) ? 0 : EIO;
503 break;
504 default:
505 old_hdr->result = EIO;
506 break;
507 }
508
509 /* Now copy the result back to the user buffer. */
510 if (count >= SZ_SG_HEADER) {
511 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
512 retval = -EFAULT;
513 goto free_old_hdr;
514 }
515 buf += SZ_SG_HEADER;
516 if (count > old_hdr->reply_len)
517 count = old_hdr->reply_len;
518 if (count > SZ_SG_HEADER) {
519 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
520 retval = -EFAULT;
521 goto free_old_hdr;
522 }
523 }
524 } else
525 count = (old_hdr->result == 0) ? 0 : -EIO;
526 sg_finish_rem_req(srp);
527 sg_remove_request(sfp, srp);
528 retval = count;
529 free_old_hdr:
530 kfree(old_hdr);
531 return retval;
532 }
533
534 static ssize_t
535 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
536 {
537 sg_io_hdr_t *hp = &srp->header;
538 int err = 0, err2;
539 int len;
540
541 if (count < SZ_SG_IO_HDR) {
542 err = -EINVAL;
543 goto err_out;
544 }
545 hp->sb_len_wr = 0;
546 if ((hp->mx_sb_len > 0) && hp->sbp) {
547 if ((CHECK_CONDITION & hp->masked_status) ||
548 (DRIVER_SENSE & hp->driver_status)) {
549 int sb_len = SCSI_SENSE_BUFFERSIZE;
550 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
551 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
552 len = (len > sb_len) ? sb_len : len;
553 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
554 err = -EFAULT;
555 goto err_out;
556 }
557 hp->sb_len_wr = len;
558 }
559 }
560 if (hp->masked_status || hp->host_status || hp->driver_status)
561 hp->info |= SG_INFO_CHECK;
562 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
563 err = -EFAULT;
564 goto err_out;
565 }
566 err_out:
567 err2 = sg_finish_rem_req(srp);
568 sg_remove_request(sfp, srp);
569 return err ? : err2 ? : count;
570 }
571
572 static ssize_t
573 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
574 {
575 int mxsize, cmd_size, k;
576 int input_size, blocking;
577 unsigned char opcode;
578 Sg_device *sdp;
579 Sg_fd *sfp;
580 Sg_request *srp;
581 struct sg_header old_hdr;
582 sg_io_hdr_t *hp;
583 unsigned char cmnd[SG_MAX_CDB_SIZE];
584
585 if (unlikely(uaccess_kernel()))
586 return -EINVAL;
587
588 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
589 return -ENXIO;
590 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
591 "sg_write: count=%d\n", (int) count));
592 if (atomic_read(&sdp->detaching))
593 return -ENODEV;
594 if (!((filp->f_flags & O_NONBLOCK) ||
595 scsi_block_when_processing_errors(sdp->device)))
596 return -ENXIO;
597
598 if (!access_ok(VERIFY_READ, buf, count))
599 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
600 if (count < SZ_SG_HEADER)
601 return -EIO;
602 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
603 return -EFAULT;
604 blocking = !(filp->f_flags & O_NONBLOCK);
605 if (old_hdr.reply_len < 0)
606 return sg_new_write(sfp, filp, buf, count,
607 blocking, 0, 0, NULL);
608 if (count < (SZ_SG_HEADER + 6))
609 return -EIO; /* The minimum scsi command length is 6 bytes. */
610
611 if (!(srp = sg_add_request(sfp))) {
612 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
613 "sg_write: queue full\n"));
614 return -EDOM;
615 }
616 buf += SZ_SG_HEADER;
617 __get_user(opcode, buf);
618 mutex_lock(&sfp->f_mutex);
619 if (sfp->next_cmd_len > 0) {
620 cmd_size = sfp->next_cmd_len;
621 sfp->next_cmd_len = 0; /* reset so only this write() effected */
622 } else {
623 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
624 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
625 cmd_size = 12;
626 }
627 mutex_unlock(&sfp->f_mutex);
628 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
629 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
630 /* Determine buffer size. */
631 input_size = count - cmd_size;
632 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
633 mxsize -= SZ_SG_HEADER;
634 input_size -= SZ_SG_HEADER;
635 if (input_size < 0) {
636 sg_remove_request(sfp, srp);
637 return -EIO; /* User did not pass enough bytes for this command. */
638 }
639 hp = &srp->header;
640 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
641 hp->cmd_len = (unsigned char) cmd_size;
642 hp->iovec_count = 0;
643 hp->mx_sb_len = 0;
644 if (input_size > 0)
645 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
646 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
647 else
648 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
649 hp->dxfer_len = mxsize;
650 if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||
651 (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV))
652 hp->dxferp = (char __user *)buf + cmd_size;
653 else
654 hp->dxferp = NULL;
655 hp->sbp = NULL;
656 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
657 hp->flags = input_size; /* structure abuse ... */
658 hp->pack_id = old_hdr.pack_id;
659 hp->usr_ptr = NULL;
660 if (__copy_from_user(cmnd, buf, cmd_size))
661 return -EFAULT;
662 /*
663 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
664 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
665 * is a non-zero input_size, so emit a warning.
666 */
667 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
668 printk_ratelimited(KERN_WARNING
669 "sg_write: data in/out %d/%d bytes "
670 "for SCSI command 0x%x-- guessing "
671 "data in;\n program %s not setting "
672 "count and/or reply_len properly\n",
673 old_hdr.reply_len - (int)SZ_SG_HEADER,
674 input_size, (unsigned int) cmnd[0],
675 current->comm);
676 }
677 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
678 return (k < 0) ? k : count;
679 }
680
681 static ssize_t
682 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
683 size_t count, int blocking, int read_only, int sg_io_owned,
684 Sg_request **o_srp)
685 {
686 int k;
687 Sg_request *srp;
688 sg_io_hdr_t *hp;
689 unsigned char cmnd[SG_MAX_CDB_SIZE];
690 int timeout;
691 unsigned long ul_timeout;
692
693 if (count < SZ_SG_IO_HDR)
694 return -EINVAL;
695 if (!access_ok(VERIFY_READ, buf, count))
696 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
697
698 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
699 if (!(srp = sg_add_request(sfp))) {
700 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
701 "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 (sfp->res_in_use) {
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 bool sg_is_valid_dxfer(sg_io_hdr_t *hp)
755 {
756 switch (hp->dxfer_direction) {
757 case SG_DXFER_NONE:
758 if (hp->dxferp || hp->dxfer_len > 0)
759 return false;
760 return true;
761 case SG_DXFER_TO_DEV:
762 case SG_DXFER_FROM_DEV:
763 case SG_DXFER_TO_FROM_DEV:
764 if (!hp->dxferp || hp->dxfer_len == 0)
765 return false;
766 return true;
767 case SG_DXFER_UNKNOWN:
768 if ((!hp->dxferp && hp->dxfer_len) ||
769 (hp->dxferp && hp->dxfer_len == 0))
770 return false;
771 return true;
772 default:
773 return false;
774 }
775 }
776
777 static int
778 sg_common_write(Sg_fd * sfp, Sg_request * srp,
779 unsigned char *cmnd, int timeout, int blocking)
780 {
781 int k, at_head;
782 Sg_device *sdp = sfp->parentdp;
783 sg_io_hdr_t *hp = &srp->header;
784
785 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
786 hp->status = 0;
787 hp->masked_status = 0;
788 hp->msg_status = 0;
789 hp->info = 0;
790 hp->host_status = 0;
791 hp->driver_status = 0;
792 hp->resid = 0;
793 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
794 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
795 (int) cmnd[0], (int) hp->cmd_len));
796
797 if (!sg_is_valid_dxfer(hp))
798 return -EINVAL;
799
800 k = sg_start_req(srp, cmnd);
801 if (k) {
802 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
803 "sg_common_write: start_req err=%d\n", k));
804 sg_finish_rem_req(srp);
805 sg_remove_request(sfp, srp);
806 return k; /* probably out of space --> ENOMEM */
807 }
808 if (atomic_read(&sdp->detaching)) {
809 if (srp->bio) {
810 scsi_req_free_cmd(scsi_req(srp->rq));
811 blk_end_request_all(srp->rq, -EIO);
812 srp->rq = NULL;
813 }
814
815 sg_finish_rem_req(srp);
816 sg_remove_request(sfp, srp);
817 return -ENODEV;
818 }
819
820 hp->duration = jiffies_to_msecs(jiffies);
821 if (hp->interface_id != '\0' && /* v3 (or later) interface */
822 (SG_FLAG_Q_AT_TAIL & hp->flags))
823 at_head = 0;
824 else
825 at_head = 1;
826
827 srp->rq->timeout = timeout;
828 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
829 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
830 srp->rq, at_head, sg_rq_end_io);
831 return 0;
832 }
833
834 static int srp_done(Sg_fd *sfp, Sg_request *srp)
835 {
836 unsigned long flags;
837 int ret;
838
839 read_lock_irqsave(&sfp->rq_list_lock, flags);
840 ret = srp->done;
841 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
842 return ret;
843 }
844
845 static int max_sectors_bytes(struct request_queue *q)
846 {
847 unsigned int max_sectors = queue_max_sectors(q);
848
849 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
850
851 return max_sectors << 9;
852 }
853
854 static long
855 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
856 {
857 void __user *p = (void __user *)arg;
858 int __user *ip = p;
859 int result, val, read_only;
860 Sg_device *sdp;
861 Sg_fd *sfp;
862 Sg_request *srp;
863 unsigned long iflags;
864
865 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
866 return -ENXIO;
867
868 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
869 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
870 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
871
872 switch (cmd_in) {
873 case SG_IO:
874 if (atomic_read(&sdp->detaching))
875 return -ENODEV;
876 if (!scsi_block_when_processing_errors(sdp->device))
877 return -ENXIO;
878 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
879 return -EFAULT;
880 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
881 1, read_only, 1, &srp);
882 if (result < 0)
883 return result;
884 result = wait_event_interruptible(sfp->read_wait,
885 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
886 if (atomic_read(&sdp->detaching))
887 return -ENODEV;
888 write_lock_irq(&sfp->rq_list_lock);
889 if (srp->done) {
890 srp->done = 2;
891 write_unlock_irq(&sfp->rq_list_lock);
892 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
893 return (result < 0) ? result : 0;
894 }
895 srp->orphan = 1;
896 write_unlock_irq(&sfp->rq_list_lock);
897 return result; /* -ERESTARTSYS because signal hit process */
898 case SG_SET_TIMEOUT:
899 result = get_user(val, ip);
900 if (result)
901 return result;
902 if (val < 0)
903 return -EIO;
904 if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ))
905 val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ),
906 INT_MAX);
907 sfp->timeout_user = val;
908 sfp->timeout = mult_frac(val, HZ, USER_HZ);
909
910 return 0;
911 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
912 /* strange ..., for backward compatibility */
913 return sfp->timeout_user;
914 case SG_SET_FORCE_LOW_DMA:
915 /*
916 * N.B. This ioctl never worked properly, but failed to
917 * return an error value. So returning '0' to keep compability
918 * with legacy applications.
919 */
920 return 0;
921 case SG_GET_LOW_DMA:
922 return put_user((int) sdp->device->host->unchecked_isa_dma, ip);
923 case SG_GET_SCSI_ID:
924 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
925 return -EFAULT;
926 else {
927 sg_scsi_id_t __user *sg_idp = p;
928
929 if (atomic_read(&sdp->detaching))
930 return -ENODEV;
931 __put_user((int) sdp->device->host->host_no,
932 &sg_idp->host_no);
933 __put_user((int) sdp->device->channel,
934 &sg_idp->channel);
935 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
936 __put_user((int) sdp->device->lun, &sg_idp->lun);
937 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
938 __put_user((short) sdp->device->host->cmd_per_lun,
939 &sg_idp->h_cmd_per_lun);
940 __put_user((short) sdp->device->queue_depth,
941 &sg_idp->d_queue_depth);
942 __put_user(0, &sg_idp->unused[0]);
943 __put_user(0, &sg_idp->unused[1]);
944 return 0;
945 }
946 case SG_SET_FORCE_PACK_ID:
947 result = get_user(val, ip);
948 if (result)
949 return result;
950 sfp->force_packid = val ? 1 : 0;
951 return 0;
952 case SG_GET_PACK_ID:
953 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
954 return -EFAULT;
955 read_lock_irqsave(&sfp->rq_list_lock, iflags);
956 list_for_each_entry(srp, &sfp->rq_list, entry) {
957 if ((1 == srp->done) && (!srp->sg_io_owned)) {
958 read_unlock_irqrestore(&sfp->rq_list_lock,
959 iflags);
960 __put_user(srp->header.pack_id, ip);
961 return 0;
962 }
963 }
964 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
965 __put_user(-1, ip);
966 return 0;
967 case SG_GET_NUM_WAITING:
968 read_lock_irqsave(&sfp->rq_list_lock, iflags);
969 val = 0;
970 list_for_each_entry(srp, &sfp->rq_list, entry) {
971 if ((1 == srp->done) && (!srp->sg_io_owned))
972 ++val;
973 }
974 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
975 return put_user(val, ip);
976 case SG_GET_SG_TABLESIZE:
977 return put_user(sdp->sg_tablesize, ip);
978 case SG_SET_RESERVED_SIZE:
979 result = get_user(val, ip);
980 if (result)
981 return result;
982 if (val < 0)
983 return -EINVAL;
984 val = min_t(int, val,
985 max_sectors_bytes(sdp->device->request_queue));
986 mutex_lock(&sfp->f_mutex);
987 if (val != sfp->reserve.bufflen) {
988 if (sfp->mmap_called ||
989 sfp->res_in_use) {
990 mutex_unlock(&sfp->f_mutex);
991 return -EBUSY;
992 }
993
994 sg_remove_scat(sfp, &sfp->reserve);
995 sg_build_reserve(sfp, val);
996 }
997 mutex_unlock(&sfp->f_mutex);
998 return 0;
999 case SG_GET_RESERVED_SIZE:
1000 val = min_t(int, sfp->reserve.bufflen,
1001 max_sectors_bytes(sdp->device->request_queue));
1002 return put_user(val, ip);
1003 case SG_SET_COMMAND_Q:
1004 result = get_user(val, ip);
1005 if (result)
1006 return result;
1007 sfp->cmd_q = val ? 1 : 0;
1008 return 0;
1009 case SG_GET_COMMAND_Q:
1010 return put_user((int) sfp->cmd_q, ip);
1011 case SG_SET_KEEP_ORPHAN:
1012 result = get_user(val, ip);
1013 if (result)
1014 return result;
1015 sfp->keep_orphan = val;
1016 return 0;
1017 case SG_GET_KEEP_ORPHAN:
1018 return put_user((int) sfp->keep_orphan, ip);
1019 case SG_NEXT_CMD_LEN:
1020 result = get_user(val, ip);
1021 if (result)
1022 return result;
1023 if (val > SG_MAX_CDB_SIZE)
1024 return -ENOMEM;
1025 sfp->next_cmd_len = (val > 0) ? val : 0;
1026 return 0;
1027 case SG_GET_VERSION_NUM:
1028 return put_user(sg_version_num, ip);
1029 case SG_GET_ACCESS_COUNT:
1030 /* faked - we don't have a real access count anymore */
1031 val = (sdp->device ? 1 : 0);
1032 return put_user(val, ip);
1033 case SG_GET_REQUEST_TABLE:
1034 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1035 return -EFAULT;
1036 else {
1037 sg_req_info_t *rinfo;
1038 unsigned int ms;
1039
1040 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1041 GFP_KERNEL);
1042 if (!rinfo)
1043 return -ENOMEM;
1044 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1045 val = 0;
1046 list_for_each_entry(srp, &sfp->rq_list, entry) {
1047 if (val > SG_MAX_QUEUE)
1048 break;
1049 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1050 rinfo[val].req_state = srp->done + 1;
1051 rinfo[val].problem =
1052 srp->header.masked_status &
1053 srp->header.host_status &
1054 srp->header.driver_status;
1055 if (srp->done)
1056 rinfo[val].duration =
1057 srp->header.duration;
1058 else {
1059 ms = jiffies_to_msecs(jiffies);
1060 rinfo[val].duration =
1061 (ms > srp->header.duration) ?
1062 (ms - srp->header.duration) : 0;
1063 }
1064 rinfo[val].orphan = srp->orphan;
1065 rinfo[val].sg_io_owned = srp->sg_io_owned;
1066 rinfo[val].pack_id = srp->header.pack_id;
1067 rinfo[val].usr_ptr = srp->header.usr_ptr;
1068 val++;
1069 }
1070 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1071 result = __copy_to_user(p, rinfo,
1072 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1073 result = result ? -EFAULT : 0;
1074 kfree(rinfo);
1075 return result;
1076 }
1077 case SG_EMULATED_HOST:
1078 if (atomic_read(&sdp->detaching))
1079 return -ENODEV;
1080 return put_user(sdp->device->host->hostt->emulated, ip);
1081 case SCSI_IOCTL_SEND_COMMAND:
1082 if (atomic_read(&sdp->detaching))
1083 return -ENODEV;
1084 if (read_only) {
1085 unsigned char opcode = WRITE_6;
1086 Scsi_Ioctl_Command __user *siocp = p;
1087
1088 if (copy_from_user(&opcode, siocp->data, 1))
1089 return -EFAULT;
1090 if (sg_allow_access(filp, &opcode))
1091 return -EPERM;
1092 }
1093 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1094 case SG_SET_DEBUG:
1095 result = get_user(val, ip);
1096 if (result)
1097 return result;
1098 sdp->sgdebug = (char) val;
1099 return 0;
1100 case BLKSECTGET:
1101 return put_user(max_sectors_bytes(sdp->device->request_queue),
1102 ip);
1103 case BLKTRACESETUP:
1104 return blk_trace_setup(sdp->device->request_queue,
1105 sdp->disk->disk_name,
1106 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1107 NULL,
1108 (char *)arg);
1109 case BLKTRACESTART:
1110 return blk_trace_startstop(sdp->device->request_queue, 1);
1111 case BLKTRACESTOP:
1112 return blk_trace_startstop(sdp->device->request_queue, 0);
1113 case BLKTRACETEARDOWN:
1114 return blk_trace_remove(sdp->device->request_queue);
1115 case SCSI_IOCTL_GET_IDLUN:
1116 case SCSI_IOCTL_GET_BUS_NUMBER:
1117 case SCSI_IOCTL_PROBE_HOST:
1118 case SG_GET_TRANSFORM:
1119 case SG_SCSI_RESET:
1120 if (atomic_read(&sdp->detaching))
1121 return -ENODEV;
1122 break;
1123 default:
1124 if (read_only)
1125 return -EPERM; /* don't know so take safe approach */
1126 break;
1127 }
1128
1129 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1130 cmd_in, filp->f_flags & O_NDELAY);
1131 if (result)
1132 return result;
1133 return scsi_ioctl(sdp->device, cmd_in, p);
1134 }
1135
1136 #ifdef CONFIG_COMPAT
1137 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1138 {
1139 Sg_device *sdp;
1140 Sg_fd *sfp;
1141 struct scsi_device *sdev;
1142
1143 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1144 return -ENXIO;
1145
1146 sdev = sdp->device;
1147 if (sdev->host->hostt->compat_ioctl) {
1148 int ret;
1149
1150 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1151
1152 return ret;
1153 }
1154
1155 return -ENOIOCTLCMD;
1156 }
1157 #endif
1158
1159 static unsigned int
1160 sg_poll(struct file *filp, poll_table * wait)
1161 {
1162 unsigned int res = 0;
1163 Sg_device *sdp;
1164 Sg_fd *sfp;
1165 Sg_request *srp;
1166 int count = 0;
1167 unsigned long iflags;
1168
1169 sfp = filp->private_data;
1170 if (!sfp)
1171 return POLLERR;
1172 sdp = sfp->parentdp;
1173 if (!sdp)
1174 return POLLERR;
1175 poll_wait(filp, &sfp->read_wait, wait);
1176 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1177 list_for_each_entry(srp, &sfp->rq_list, entry) {
1178 /* if any read waiting, flag it */
1179 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1180 res = POLLIN | POLLRDNORM;
1181 ++count;
1182 }
1183 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1184
1185 if (atomic_read(&sdp->detaching))
1186 res |= POLLHUP;
1187 else if (!sfp->cmd_q) {
1188 if (0 == count)
1189 res |= POLLOUT | POLLWRNORM;
1190 } else if (count < SG_MAX_QUEUE)
1191 res |= POLLOUT | POLLWRNORM;
1192 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1193 "sg_poll: res=0x%x\n", (int) res));
1194 return res;
1195 }
1196
1197 static int
1198 sg_fasync(int fd, struct file *filp, int mode)
1199 {
1200 Sg_device *sdp;
1201 Sg_fd *sfp;
1202
1203 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1204 return -ENXIO;
1205 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1206 "sg_fasync: mode=%d\n", mode));
1207
1208 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1209 }
1210
1211 static int
1212 sg_vma_fault(struct vm_fault *vmf)
1213 {
1214 struct vm_area_struct *vma = vmf->vma;
1215 Sg_fd *sfp;
1216 unsigned long offset, len, sa;
1217 Sg_scatter_hold *rsv_schp;
1218 int k, length;
1219
1220 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1221 return VM_FAULT_SIGBUS;
1222 rsv_schp = &sfp->reserve;
1223 offset = vmf->pgoff << PAGE_SHIFT;
1224 if (offset >= rsv_schp->bufflen)
1225 return VM_FAULT_SIGBUS;
1226 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1227 "sg_vma_fault: offset=%lu, scatg=%d\n",
1228 offset, rsv_schp->k_use_sg));
1229 sa = vma->vm_start;
1230 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1231 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1232 len = vma->vm_end - sa;
1233 len = (len < length) ? len : length;
1234 if (offset < len) {
1235 struct page *page = nth_page(rsv_schp->pages[k],
1236 offset >> PAGE_SHIFT);
1237 get_page(page); /* increment page count */
1238 vmf->page = page;
1239 return 0; /* success */
1240 }
1241 sa += len;
1242 offset -= len;
1243 }
1244
1245 return VM_FAULT_SIGBUS;
1246 }
1247
1248 static const struct vm_operations_struct sg_mmap_vm_ops = {
1249 .fault = sg_vma_fault,
1250 };
1251
1252 static int
1253 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1254 {
1255 Sg_fd *sfp;
1256 unsigned long req_sz, len, sa;
1257 Sg_scatter_hold *rsv_schp;
1258 int k, length;
1259
1260 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1261 return -ENXIO;
1262 req_sz = vma->vm_end - vma->vm_start;
1263 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1264 "sg_mmap starting, vm_start=%p, len=%d\n",
1265 (void *) vma->vm_start, (int) req_sz));
1266 if (vma->vm_pgoff)
1267 return -EINVAL; /* want no offset */
1268 rsv_schp = &sfp->reserve;
1269 if (req_sz > rsv_schp->bufflen)
1270 return -ENOMEM; /* cannot map more than reserved buffer */
1271
1272 sa = vma->vm_start;
1273 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1274 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1275 len = vma->vm_end - sa;
1276 len = (len < length) ? len : length;
1277 sa += len;
1278 }
1279
1280 sfp->mmap_called = 1;
1281 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1282 vma->vm_private_data = sfp;
1283 vma->vm_ops = &sg_mmap_vm_ops;
1284 return 0;
1285 }
1286
1287 static void
1288 sg_rq_end_io_usercontext(struct work_struct *work)
1289 {
1290 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1291 struct sg_fd *sfp = srp->parentfp;
1292
1293 sg_finish_rem_req(srp);
1294 sg_remove_request(sfp, srp);
1295 kref_put(&sfp->f_ref, sg_remove_sfp);
1296 }
1297
1298 /*
1299 * This function is a "bottom half" handler that is called by the mid
1300 * level when a command is completed (or has failed).
1301 */
1302 static void
1303 sg_rq_end_io(struct request *rq, int uptodate)
1304 {
1305 struct sg_request *srp = rq->end_io_data;
1306 struct scsi_request *req = scsi_req(rq);
1307 Sg_device *sdp;
1308 Sg_fd *sfp;
1309 unsigned long iflags;
1310 unsigned int ms;
1311 char *sense;
1312 int result, resid, done = 1;
1313
1314 if (WARN_ON(srp->done != 0))
1315 return;
1316
1317 sfp = srp->parentfp;
1318 if (WARN_ON(sfp == NULL))
1319 return;
1320
1321 sdp = sfp->parentdp;
1322 if (unlikely(atomic_read(&sdp->detaching)))
1323 pr_info("%s: device detaching\n", __func__);
1324
1325 sense = req->sense;
1326 result = req->result;
1327 resid = req->resid_len;
1328
1329 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1330 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1331 srp->header.pack_id, result));
1332 srp->header.resid = resid;
1333 ms = jiffies_to_msecs(jiffies);
1334 srp->header.duration = (ms > srp->header.duration) ?
1335 (ms - srp->header.duration) : 0;
1336 if (0 != result) {
1337 struct scsi_sense_hdr sshdr;
1338
1339 srp->header.status = 0xff & result;
1340 srp->header.masked_status = status_byte(result);
1341 srp->header.msg_status = msg_byte(result);
1342 srp->header.host_status = host_byte(result);
1343 srp->header.driver_status = driver_byte(result);
1344 if ((sdp->sgdebug > 0) &&
1345 ((CHECK_CONDITION == srp->header.masked_status) ||
1346 (COMMAND_TERMINATED == srp->header.masked_status)))
1347 __scsi_print_sense(sdp->device, __func__, sense,
1348 SCSI_SENSE_BUFFERSIZE);
1349
1350 /* Following if statement is a patch supplied by Eric Youngdale */
1351 if (driver_byte(result) != 0
1352 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1353 && !scsi_sense_is_deferred(&sshdr)
1354 && sshdr.sense_key == UNIT_ATTENTION
1355 && sdp->device->removable) {
1356 /* Detected possible disc change. Set the bit - this */
1357 /* may be used if there are filesystems using this device */
1358 sdp->device->changed = 1;
1359 }
1360 }
1361
1362 if (req->sense_len)
1363 memcpy(srp->sense_b, req->sense, SCSI_SENSE_BUFFERSIZE);
1364
1365 /* Rely on write phase to clean out srp status values, so no "else" */
1366
1367 /*
1368 * Free the request as soon as it is complete so that its resources
1369 * can be reused without waiting for userspace to read() the
1370 * result. But keep the associated bio (if any) around until
1371 * blk_rq_unmap_user() can be called from user context.
1372 */
1373 srp->rq = NULL;
1374 scsi_req_free_cmd(scsi_req(rq));
1375 __blk_put_request(rq->q, rq);
1376
1377 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1378 if (unlikely(srp->orphan)) {
1379 if (sfp->keep_orphan)
1380 srp->sg_io_owned = 0;
1381 else
1382 done = 0;
1383 }
1384 srp->done = done;
1385 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1386
1387 if (likely(done)) {
1388 /* Now wake up any sg_read() that is waiting for this
1389 * packet.
1390 */
1391 wake_up_interruptible(&sfp->read_wait);
1392 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1393 kref_put(&sfp->f_ref, sg_remove_sfp);
1394 } else {
1395 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1396 schedule_work(&srp->ew.work);
1397 }
1398 }
1399
1400 static const struct file_operations sg_fops = {
1401 .owner = THIS_MODULE,
1402 .read = sg_read,
1403 .write = sg_write,
1404 .poll = sg_poll,
1405 .unlocked_ioctl = sg_ioctl,
1406 #ifdef CONFIG_COMPAT
1407 .compat_ioctl = sg_compat_ioctl,
1408 #endif
1409 .open = sg_open,
1410 .mmap = sg_mmap,
1411 .release = sg_release,
1412 .fasync = sg_fasync,
1413 .llseek = no_llseek,
1414 };
1415
1416 static struct class *sg_sysfs_class;
1417
1418 static int sg_sysfs_valid = 0;
1419
1420 static Sg_device *
1421 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1422 {
1423 struct request_queue *q = scsidp->request_queue;
1424 Sg_device *sdp;
1425 unsigned long iflags;
1426 int error;
1427 u32 k;
1428
1429 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1430 if (!sdp) {
1431 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1432 "failure\n", __func__);
1433 return ERR_PTR(-ENOMEM);
1434 }
1435
1436 idr_preload(GFP_KERNEL);
1437 write_lock_irqsave(&sg_index_lock, iflags);
1438
1439 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1440 if (error < 0) {
1441 if (error == -ENOSPC) {
1442 sdev_printk(KERN_WARNING, scsidp,
1443 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1444 scsidp->type, SG_MAX_DEVS - 1);
1445 error = -ENODEV;
1446 } else {
1447 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1448 "allocation Sg_device failure: %d\n",
1449 __func__, error);
1450 }
1451 goto out_unlock;
1452 }
1453 k = error;
1454
1455 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1456 "sg_alloc: dev=%d \n", k));
1457 sprintf(disk->disk_name, "sg%d", k);
1458 disk->first_minor = k;
1459 sdp->disk = disk;
1460 sdp->device = scsidp;
1461 mutex_init(&sdp->open_rel_lock);
1462 INIT_LIST_HEAD(&sdp->sfds);
1463 init_waitqueue_head(&sdp->open_wait);
1464 atomic_set(&sdp->detaching, 0);
1465 rwlock_init(&sdp->sfd_lock);
1466 sdp->sg_tablesize = queue_max_segments(q);
1467 sdp->index = k;
1468 kref_init(&sdp->d_ref);
1469 error = 0;
1470
1471 out_unlock:
1472 write_unlock_irqrestore(&sg_index_lock, iflags);
1473 idr_preload_end();
1474
1475 if (error) {
1476 kfree(sdp);
1477 return ERR_PTR(error);
1478 }
1479 return sdp;
1480 }
1481
1482 static int
1483 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1484 {
1485 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1486 struct gendisk *disk;
1487 Sg_device *sdp = NULL;
1488 struct cdev * cdev = NULL;
1489 int error;
1490 unsigned long iflags;
1491
1492 disk = alloc_disk(1);
1493 if (!disk) {
1494 pr_warn("%s: alloc_disk failed\n", __func__);
1495 return -ENOMEM;
1496 }
1497 disk->major = SCSI_GENERIC_MAJOR;
1498
1499 error = -ENOMEM;
1500 cdev = cdev_alloc();
1501 if (!cdev) {
1502 pr_warn("%s: cdev_alloc failed\n", __func__);
1503 goto out;
1504 }
1505 cdev->owner = THIS_MODULE;
1506 cdev->ops = &sg_fops;
1507
1508 sdp = sg_alloc(disk, scsidp);
1509 if (IS_ERR(sdp)) {
1510 pr_warn("%s: sg_alloc failed\n", __func__);
1511 error = PTR_ERR(sdp);
1512 goto out;
1513 }
1514
1515 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1516 if (error)
1517 goto cdev_add_err;
1518
1519 sdp->cdev = cdev;
1520 if (sg_sysfs_valid) {
1521 struct device *sg_class_member;
1522
1523 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1524 MKDEV(SCSI_GENERIC_MAJOR,
1525 sdp->index),
1526 sdp, "%s", disk->disk_name);
1527 if (IS_ERR(sg_class_member)) {
1528 pr_err("%s: device_create failed\n", __func__);
1529 error = PTR_ERR(sg_class_member);
1530 goto cdev_add_err;
1531 }
1532 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1533 &sg_class_member->kobj, "generic");
1534 if (error)
1535 pr_err("%s: unable to make symlink 'generic' back "
1536 "to sg%d\n", __func__, sdp->index);
1537 } else
1538 pr_warn("%s: sg_sys Invalid\n", __func__);
1539
1540 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1541 "type %d\n", sdp->index, scsidp->type);
1542
1543 dev_set_drvdata(cl_dev, sdp);
1544
1545 return 0;
1546
1547 cdev_add_err:
1548 write_lock_irqsave(&sg_index_lock, iflags);
1549 idr_remove(&sg_index_idr, sdp->index);
1550 write_unlock_irqrestore(&sg_index_lock, iflags);
1551 kfree(sdp);
1552
1553 out:
1554 put_disk(disk);
1555 if (cdev)
1556 cdev_del(cdev);
1557 return error;
1558 }
1559
1560 static void
1561 sg_device_destroy(struct kref *kref)
1562 {
1563 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1564 unsigned long flags;
1565
1566 /* CAUTION! Note that the device can still be found via idr_find()
1567 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1568 * any other cleanup.
1569 */
1570
1571 write_lock_irqsave(&sg_index_lock, flags);
1572 idr_remove(&sg_index_idr, sdp->index);
1573 write_unlock_irqrestore(&sg_index_lock, flags);
1574
1575 SCSI_LOG_TIMEOUT(3,
1576 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
1577
1578 put_disk(sdp->disk);
1579 kfree(sdp);
1580 }
1581
1582 static void
1583 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1584 {
1585 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1586 Sg_device *sdp = dev_get_drvdata(cl_dev);
1587 unsigned long iflags;
1588 Sg_fd *sfp;
1589 int val;
1590
1591 if (!sdp)
1592 return;
1593 /* want sdp->detaching non-zero as soon as possible */
1594 val = atomic_inc_return(&sdp->detaching);
1595 if (val > 1)
1596 return; /* only want to do following once per device */
1597
1598 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1599 "%s\n", __func__));
1600
1601 read_lock_irqsave(&sdp->sfd_lock, iflags);
1602 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1603 wake_up_interruptible_all(&sfp->read_wait);
1604 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1605 }
1606 wake_up_interruptible_all(&sdp->open_wait);
1607 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1608
1609 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1610 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1611 cdev_del(sdp->cdev);
1612 sdp->cdev = NULL;
1613
1614 kref_put(&sdp->d_ref, sg_device_destroy);
1615 }
1616
1617 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1618 module_param_named(def_reserved_size, def_reserved_size, int,
1619 S_IRUGO | S_IWUSR);
1620 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1621
1622 MODULE_AUTHOR("Douglas Gilbert");
1623 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1624 MODULE_LICENSE("GPL");
1625 MODULE_VERSION(SG_VERSION_STR);
1626 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1627
1628 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1629 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1630 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1631 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1632
1633 static int __init
1634 init_sg(void)
1635 {
1636 int rc;
1637
1638 if (scatter_elem_sz < PAGE_SIZE) {
1639 scatter_elem_sz = PAGE_SIZE;
1640 scatter_elem_sz_prev = scatter_elem_sz;
1641 }
1642 if (def_reserved_size >= 0)
1643 sg_big_buff = def_reserved_size;
1644 else
1645 def_reserved_size = sg_big_buff;
1646
1647 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1648 SG_MAX_DEVS, "sg");
1649 if (rc)
1650 return rc;
1651 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1652 if ( IS_ERR(sg_sysfs_class) ) {
1653 rc = PTR_ERR(sg_sysfs_class);
1654 goto err_out;
1655 }
1656 sg_sysfs_valid = 1;
1657 rc = scsi_register_interface(&sg_interface);
1658 if (0 == rc) {
1659 #ifdef CONFIG_SCSI_PROC_FS
1660 sg_proc_init();
1661 #endif /* CONFIG_SCSI_PROC_FS */
1662 return 0;
1663 }
1664 class_destroy(sg_sysfs_class);
1665 err_out:
1666 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1667 return rc;
1668 }
1669
1670 static void __exit
1671 exit_sg(void)
1672 {
1673 #ifdef CONFIG_SCSI_PROC_FS
1674 sg_proc_cleanup();
1675 #endif /* CONFIG_SCSI_PROC_FS */
1676 scsi_unregister_interface(&sg_interface);
1677 class_destroy(sg_sysfs_class);
1678 sg_sysfs_valid = 0;
1679 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1680 SG_MAX_DEVS);
1681 idr_destroy(&sg_index_idr);
1682 }
1683
1684 static int
1685 sg_start_req(Sg_request *srp, unsigned char *cmd)
1686 {
1687 int res;
1688 struct request *rq;
1689 struct scsi_request *req;
1690 Sg_fd *sfp = srp->parentfp;
1691 sg_io_hdr_t *hp = &srp->header;
1692 int dxfer_len = (int) hp->dxfer_len;
1693 int dxfer_dir = hp->dxfer_direction;
1694 unsigned int iov_count = hp->iovec_count;
1695 Sg_scatter_hold *req_schp = &srp->data;
1696 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1697 struct request_queue *q = sfp->parentdp->device->request_queue;
1698 struct rq_map_data *md, map_data;
1699 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1700 unsigned char *long_cmdp = NULL;
1701
1702 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1703 "sg_start_req: dxfer_len=%d\n",
1704 dxfer_len));
1705
1706 if (hp->cmd_len > BLK_MAX_CDB) {
1707 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1708 if (!long_cmdp)
1709 return -ENOMEM;
1710 }
1711
1712 /*
1713 * NOTE
1714 *
1715 * With scsi-mq enabled, there are a fixed number of preallocated
1716 * requests equal in number to shost->can_queue. If all of the
1717 * preallocated requests are already in use, then using GFP_ATOMIC with
1718 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1719 * will cause blk_get_request() to sleep until an active command
1720 * completes, freeing up a request. Neither option is ideal, but
1721 * GFP_KERNEL is the better choice to prevent userspace from getting an
1722 * unexpected EWOULDBLOCK.
1723 *
1724 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1725 * does not sleep except under memory pressure.
1726 */
1727 rq = blk_get_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ?
1728 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, GFP_KERNEL);
1729 if (IS_ERR(rq)) {
1730 kfree(long_cmdp);
1731 return PTR_ERR(rq);
1732 }
1733 req = scsi_req(rq);
1734
1735 scsi_req_init(rq);
1736
1737 if (hp->cmd_len > BLK_MAX_CDB)
1738 req->cmd = long_cmdp;
1739 memcpy(req->cmd, cmd, hp->cmd_len);
1740 req->cmd_len = hp->cmd_len;
1741
1742 srp->rq = rq;
1743 rq->end_io_data = srp;
1744 req->retries = SG_DEFAULT_RETRIES;
1745
1746 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1747 return 0;
1748
1749 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1750 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1751 !sfp->parentdp->device->host->unchecked_isa_dma &&
1752 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1753 md = NULL;
1754 else
1755 md = &map_data;
1756
1757 if (md) {
1758 mutex_lock(&sfp->f_mutex);
1759 if (dxfer_len <= rsv_schp->bufflen &&
1760 !sfp->res_in_use) {
1761 sfp->res_in_use = 1;
1762 sg_link_reserve(sfp, srp, dxfer_len);
1763 } else if ((hp->flags & SG_FLAG_MMAP_IO) && sfp->res_in_use) {
1764 mutex_unlock(&sfp->f_mutex);
1765 return -EBUSY;
1766 } else {
1767 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1768 if (res) {
1769 mutex_unlock(&sfp->f_mutex);
1770 return res;
1771 }
1772 }
1773 mutex_unlock(&sfp->f_mutex);
1774
1775 md->pages = req_schp->pages;
1776 md->page_order = req_schp->page_order;
1777 md->nr_entries = req_schp->k_use_sg;
1778 md->offset = 0;
1779 md->null_mapped = hp->dxferp ? 0 : 1;
1780 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1781 md->from_user = 1;
1782 else
1783 md->from_user = 0;
1784 }
1785
1786 if (iov_count) {
1787 struct iovec *iov = NULL;
1788 struct iov_iter i;
1789
1790 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
1791 if (res < 0)
1792 return res;
1793
1794 iov_iter_truncate(&i, hp->dxfer_len);
1795 if (!iov_iter_count(&i)) {
1796 kfree(iov);
1797 return -EINVAL;
1798 }
1799
1800 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
1801 kfree(iov);
1802 } else
1803 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1804 hp->dxfer_len, GFP_ATOMIC);
1805
1806 if (!res) {
1807 srp->bio = rq->bio;
1808
1809 if (!md) {
1810 req_schp->dio_in_use = 1;
1811 hp->info |= SG_INFO_DIRECT_IO;
1812 }
1813 }
1814 return res;
1815 }
1816
1817 static int
1818 sg_finish_rem_req(Sg_request *srp)
1819 {
1820 int ret = 0;
1821
1822 Sg_fd *sfp = srp->parentfp;
1823 Sg_scatter_hold *req_schp = &srp->data;
1824
1825 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1826 "sg_finish_rem_req: res_used=%d\n",
1827 (int) srp->res_used));
1828 if (srp->bio)
1829 ret = blk_rq_unmap_user(srp->bio);
1830
1831 if (srp->rq) {
1832 scsi_req_free_cmd(scsi_req(srp->rq));
1833 blk_put_request(srp->rq);
1834 }
1835
1836 if (srp->res_used)
1837 sg_unlink_reserve(sfp, srp);
1838 else
1839 sg_remove_scat(sfp, req_schp);
1840
1841 return ret;
1842 }
1843
1844 static int
1845 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1846 {
1847 int sg_bufflen = tablesize * sizeof(struct page *);
1848 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1849
1850 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1851 if (!schp->pages)
1852 return -ENOMEM;
1853 schp->sglist_len = sg_bufflen;
1854 return tablesize; /* number of scat_gath elements allocated */
1855 }
1856
1857 static int
1858 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1859 {
1860 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1861 int sg_tablesize = sfp->parentdp->sg_tablesize;
1862 int blk_size = buff_size, order;
1863 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1864 struct sg_device *sdp = sfp->parentdp;
1865
1866 if (blk_size < 0)
1867 return -EFAULT;
1868 if (0 == blk_size)
1869 ++blk_size; /* don't know why */
1870 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1871 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1872 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1873 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1874 buff_size, blk_size));
1875
1876 /* N.B. ret_sz carried into this block ... */
1877 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1878 if (mx_sc_elems < 0)
1879 return mx_sc_elems; /* most likely -ENOMEM */
1880
1881 num = scatter_elem_sz;
1882 if (unlikely(num != scatter_elem_sz_prev)) {
1883 if (num < PAGE_SIZE) {
1884 scatter_elem_sz = PAGE_SIZE;
1885 scatter_elem_sz_prev = PAGE_SIZE;
1886 } else
1887 scatter_elem_sz_prev = num;
1888 }
1889
1890 if (sdp->device->host->unchecked_isa_dma)
1891 gfp_mask |= GFP_DMA;
1892
1893 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1894 gfp_mask |= __GFP_ZERO;
1895
1896 order = get_order(num);
1897 retry:
1898 ret_sz = 1 << (PAGE_SHIFT + order);
1899
1900 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1901 k++, rem_sz -= ret_sz) {
1902
1903 num = (rem_sz > scatter_elem_sz_prev) ?
1904 scatter_elem_sz_prev : rem_sz;
1905
1906 schp->pages[k] = alloc_pages(gfp_mask, order);
1907 if (!schp->pages[k])
1908 goto out;
1909
1910 if (num == scatter_elem_sz_prev) {
1911 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1912 scatter_elem_sz = ret_sz;
1913 scatter_elem_sz_prev = ret_sz;
1914 }
1915 }
1916
1917 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1918 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1919 k, num, ret_sz));
1920 } /* end of for loop */
1921
1922 schp->page_order = order;
1923 schp->k_use_sg = k;
1924 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1925 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1926 k, rem_sz));
1927
1928 schp->bufflen = blk_size;
1929 if (rem_sz > 0) /* must have failed */
1930 return -ENOMEM;
1931 return 0;
1932 out:
1933 for (i = 0; i < k; i++)
1934 __free_pages(schp->pages[i], order);
1935
1936 if (--order >= 0)
1937 goto retry;
1938
1939 return -ENOMEM;
1940 }
1941
1942 static void
1943 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1944 {
1945 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1946 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1947 if (schp->pages && schp->sglist_len > 0) {
1948 if (!schp->dio_in_use) {
1949 int k;
1950
1951 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1952 SCSI_LOG_TIMEOUT(5,
1953 sg_printk(KERN_INFO, sfp->parentdp,
1954 "sg_remove_scat: k=%d, pg=0x%p\n",
1955 k, schp->pages[k]));
1956 __free_pages(schp->pages[k], schp->page_order);
1957 }
1958
1959 kfree(schp->pages);
1960 }
1961 }
1962 memset(schp, 0, sizeof (*schp));
1963 }
1964
1965 static int
1966 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1967 {
1968 Sg_scatter_hold *schp = &srp->data;
1969 int k, num;
1970
1971 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1972 "sg_read_oxfer: num_read_xfer=%d\n",
1973 num_read_xfer));
1974 if ((!outp) || (num_read_xfer <= 0))
1975 return 0;
1976
1977 num = 1 << (PAGE_SHIFT + schp->page_order);
1978 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1979 if (num > num_read_xfer) {
1980 if (__copy_to_user(outp, page_address(schp->pages[k]),
1981 num_read_xfer))
1982 return -EFAULT;
1983 break;
1984 } else {
1985 if (__copy_to_user(outp, page_address(schp->pages[k]),
1986 num))
1987 return -EFAULT;
1988 num_read_xfer -= num;
1989 if (num_read_xfer <= 0)
1990 break;
1991 outp += num;
1992 }
1993 }
1994
1995 return 0;
1996 }
1997
1998 static void
1999 sg_build_reserve(Sg_fd * sfp, int req_size)
2000 {
2001 Sg_scatter_hold *schp = &sfp->reserve;
2002
2003 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
2004 "sg_build_reserve: req_size=%d\n", req_size));
2005 do {
2006 if (req_size < PAGE_SIZE)
2007 req_size = PAGE_SIZE;
2008 if (0 == sg_build_indirect(schp, sfp, req_size))
2009 return;
2010 else
2011 sg_remove_scat(sfp, schp);
2012 req_size >>= 1; /* divide by 2 */
2013 } while (req_size > (PAGE_SIZE / 2));
2014 }
2015
2016 static void
2017 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2018 {
2019 Sg_scatter_hold *req_schp = &srp->data;
2020 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2021 int k, num, rem;
2022
2023 srp->res_used = 1;
2024 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
2025 "sg_link_reserve: size=%d\n", size));
2026 rem = size;
2027
2028 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
2029 for (k = 0; k < rsv_schp->k_use_sg; k++) {
2030 if (rem <= num) {
2031 req_schp->k_use_sg = k + 1;
2032 req_schp->sglist_len = rsv_schp->sglist_len;
2033 req_schp->pages = rsv_schp->pages;
2034
2035 req_schp->bufflen = size;
2036 req_schp->page_order = rsv_schp->page_order;
2037 break;
2038 } else
2039 rem -= num;
2040 }
2041
2042 if (k >= rsv_schp->k_use_sg)
2043 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2044 "sg_link_reserve: BAD size\n"));
2045 }
2046
2047 static void
2048 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2049 {
2050 Sg_scatter_hold *req_schp = &srp->data;
2051
2052 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2053 "sg_unlink_reserve: req->k_use_sg=%d\n",
2054 (int) req_schp->k_use_sg));
2055 req_schp->k_use_sg = 0;
2056 req_schp->bufflen = 0;
2057 req_schp->pages = NULL;
2058 req_schp->page_order = 0;
2059 req_schp->sglist_len = 0;
2060 srp->res_used = 0;
2061 /* Called without mutex lock to avoid deadlock */
2062 sfp->res_in_use = 0;
2063 }
2064
2065 static Sg_request *
2066 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2067 {
2068 Sg_request *resp;
2069 unsigned long iflags;
2070
2071 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2072 list_for_each_entry(resp, &sfp->rq_list, entry) {
2073 /* look for requests that are ready + not SG_IO owned */
2074 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2075 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2076 resp->done = 2; /* guard against other readers */
2077 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2078 return resp;
2079 }
2080 }
2081 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2082 return NULL;
2083 }
2084
2085 /* always adds to end of list */
2086 static Sg_request *
2087 sg_add_request(Sg_fd * sfp)
2088 {
2089 int k;
2090 unsigned long iflags;
2091 Sg_request *rp = sfp->req_arr;
2092
2093 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2094 if (!list_empty(&sfp->rq_list)) {
2095 if (!sfp->cmd_q)
2096 goto out_unlock;
2097
2098 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2099 if (!rp->parentfp)
2100 break;
2101 }
2102 if (k >= SG_MAX_QUEUE)
2103 goto out_unlock;
2104 }
2105 memset(rp, 0, sizeof (Sg_request));
2106 rp->parentfp = sfp;
2107 rp->header.duration = jiffies_to_msecs(jiffies);
2108 list_add_tail(&rp->entry, &sfp->rq_list);
2109 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2110 return rp;
2111 out_unlock:
2112 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2113 return NULL;
2114 }
2115
2116 /* Return of 1 for found; 0 for not found */
2117 static int
2118 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2119 {
2120 unsigned long iflags;
2121 int res = 0;
2122
2123 if (!sfp || !srp || list_empty(&sfp->rq_list))
2124 return res;
2125 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2126 if (!list_empty(&srp->entry)) {
2127 list_del(&srp->entry);
2128 srp->parentfp = NULL;
2129 res = 1;
2130 }
2131 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2132 return res;
2133 }
2134
2135 static Sg_fd *
2136 sg_add_sfp(Sg_device * sdp)
2137 {
2138 Sg_fd *sfp;
2139 unsigned long iflags;
2140 int bufflen;
2141
2142 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2143 if (!sfp)
2144 return ERR_PTR(-ENOMEM);
2145
2146 init_waitqueue_head(&sfp->read_wait);
2147 rwlock_init(&sfp->rq_list_lock);
2148 INIT_LIST_HEAD(&sfp->rq_list);
2149 kref_init(&sfp->f_ref);
2150 mutex_init(&sfp->f_mutex);
2151 sfp->timeout = SG_DEFAULT_TIMEOUT;
2152 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2153 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2154 sfp->cmd_q = SG_DEF_COMMAND_Q;
2155 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2156 sfp->parentdp = sdp;
2157 write_lock_irqsave(&sdp->sfd_lock, iflags);
2158 if (atomic_read(&sdp->detaching)) {
2159 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2160 return ERR_PTR(-ENODEV);
2161 }
2162 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2163 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2164 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2165 "sg_add_sfp: sfp=0x%p\n", sfp));
2166 if (unlikely(sg_big_buff != def_reserved_size))
2167 sg_big_buff = def_reserved_size;
2168
2169 bufflen = min_t(int, sg_big_buff,
2170 max_sectors_bytes(sdp->device->request_queue));
2171 sg_build_reserve(sfp, bufflen);
2172 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2173 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2174 sfp->reserve.bufflen,
2175 sfp->reserve.k_use_sg));
2176
2177 kref_get(&sdp->d_ref);
2178 __module_get(THIS_MODULE);
2179 return sfp;
2180 }
2181
2182 static void
2183 sg_remove_sfp_usercontext(struct work_struct *work)
2184 {
2185 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2186 struct sg_device *sdp = sfp->parentdp;
2187 Sg_request *srp;
2188 unsigned long iflags;
2189
2190 /* Cleanup any responses which were never read(). */
2191 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2192 while (!list_empty(&sfp->rq_list)) {
2193 srp = list_first_entry(&sfp->rq_list, Sg_request, entry);
2194 sg_finish_rem_req(srp);
2195 list_del(&srp->entry);
2196 srp->parentfp = NULL;
2197 }
2198 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2199
2200 if (sfp->reserve.bufflen > 0) {
2201 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2202 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2203 (int) sfp->reserve.bufflen,
2204 (int) sfp->reserve.k_use_sg));
2205 sg_remove_scat(sfp, &sfp->reserve);
2206 }
2207
2208 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2209 "sg_remove_sfp: sfp=0x%p\n", sfp));
2210 kfree(sfp);
2211
2212 scsi_device_put(sdp->device);
2213 kref_put(&sdp->d_ref, sg_device_destroy);
2214 module_put(THIS_MODULE);
2215 }
2216
2217 static void
2218 sg_remove_sfp(struct kref *kref)
2219 {
2220 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2221 struct sg_device *sdp = sfp->parentdp;
2222 unsigned long iflags;
2223
2224 write_lock_irqsave(&sdp->sfd_lock, iflags);
2225 list_del(&sfp->sfd_siblings);
2226 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2227
2228 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2229 schedule_work(&sfp->ew.work);
2230 }
2231
2232 #ifdef CONFIG_SCSI_PROC_FS
2233 static int
2234 sg_idr_max_id(int id, void *p, void *data)
2235 {
2236 int *k = data;
2237
2238 if (*k < id)
2239 *k = id;
2240
2241 return 0;
2242 }
2243
2244 static int
2245 sg_last_dev(void)
2246 {
2247 int k = -1;
2248 unsigned long iflags;
2249
2250 read_lock_irqsave(&sg_index_lock, iflags);
2251 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2252 read_unlock_irqrestore(&sg_index_lock, iflags);
2253 return k + 1; /* origin 1 */
2254 }
2255 #endif
2256
2257 /* must be called with sg_index_lock held */
2258 static Sg_device *sg_lookup_dev(int dev)
2259 {
2260 return idr_find(&sg_index_idr, dev);
2261 }
2262
2263 static Sg_device *
2264 sg_get_dev(int dev)
2265 {
2266 struct sg_device *sdp;
2267 unsigned long flags;
2268
2269 read_lock_irqsave(&sg_index_lock, flags);
2270 sdp = sg_lookup_dev(dev);
2271 if (!sdp)
2272 sdp = ERR_PTR(-ENXIO);
2273 else if (atomic_read(&sdp->detaching)) {
2274 /* If sdp->detaching, then the refcount may already be 0, in
2275 * which case it would be a bug to do kref_get().
2276 */
2277 sdp = ERR_PTR(-ENODEV);
2278 } else
2279 kref_get(&sdp->d_ref);
2280 read_unlock_irqrestore(&sg_index_lock, flags);
2281
2282 return sdp;
2283 }
2284
2285 #ifdef CONFIG_SCSI_PROC_FS
2286
2287 static struct proc_dir_entry *sg_proc_sgp = NULL;
2288
2289 static char sg_proc_sg_dirname[] = "scsi/sg";
2290
2291 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2292
2293 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2294 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2295 size_t count, loff_t *off);
2296 static const struct file_operations adio_fops = {
2297 .owner = THIS_MODULE,
2298 .open = sg_proc_single_open_adio,
2299 .read = seq_read,
2300 .llseek = seq_lseek,
2301 .write = sg_proc_write_adio,
2302 .release = single_release,
2303 };
2304
2305 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2306 static ssize_t sg_proc_write_dressz(struct file *filp,
2307 const char __user *buffer, size_t count, loff_t *off);
2308 static const struct file_operations dressz_fops = {
2309 .owner = THIS_MODULE,
2310 .open = sg_proc_single_open_dressz,
2311 .read = seq_read,
2312 .llseek = seq_lseek,
2313 .write = sg_proc_write_dressz,
2314 .release = single_release,
2315 };
2316
2317 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2318 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2319 static const struct file_operations version_fops = {
2320 .owner = THIS_MODULE,
2321 .open = sg_proc_single_open_version,
2322 .read = seq_read,
2323 .llseek = seq_lseek,
2324 .release = single_release,
2325 };
2326
2327 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2328 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2329 static const struct file_operations devhdr_fops = {
2330 .owner = THIS_MODULE,
2331 .open = sg_proc_single_open_devhdr,
2332 .read = seq_read,
2333 .llseek = seq_lseek,
2334 .release = single_release,
2335 };
2336
2337 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2338 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2339 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2340 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2341 static void dev_seq_stop(struct seq_file *s, void *v);
2342 static const struct file_operations dev_fops = {
2343 .owner = THIS_MODULE,
2344 .open = sg_proc_open_dev,
2345 .read = seq_read,
2346 .llseek = seq_lseek,
2347 .release = seq_release,
2348 };
2349 static const struct seq_operations dev_seq_ops = {
2350 .start = dev_seq_start,
2351 .next = dev_seq_next,
2352 .stop = dev_seq_stop,
2353 .show = sg_proc_seq_show_dev,
2354 };
2355
2356 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2357 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2358 static const struct file_operations devstrs_fops = {
2359 .owner = THIS_MODULE,
2360 .open = sg_proc_open_devstrs,
2361 .read = seq_read,
2362 .llseek = seq_lseek,
2363 .release = seq_release,
2364 };
2365 static const struct seq_operations devstrs_seq_ops = {
2366 .start = dev_seq_start,
2367 .next = dev_seq_next,
2368 .stop = dev_seq_stop,
2369 .show = sg_proc_seq_show_devstrs,
2370 };
2371
2372 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2373 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2374 static const struct file_operations debug_fops = {
2375 .owner = THIS_MODULE,
2376 .open = sg_proc_open_debug,
2377 .read = seq_read,
2378 .llseek = seq_lseek,
2379 .release = seq_release,
2380 };
2381 static const struct seq_operations debug_seq_ops = {
2382 .start = dev_seq_start,
2383 .next = dev_seq_next,
2384 .stop = dev_seq_stop,
2385 .show = sg_proc_seq_show_debug,
2386 };
2387
2388
2389 struct sg_proc_leaf {
2390 const char * name;
2391 const struct file_operations * fops;
2392 };
2393
2394 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2395 {"allow_dio", &adio_fops},
2396 {"debug", &debug_fops},
2397 {"def_reserved_size", &dressz_fops},
2398 {"device_hdr", &devhdr_fops},
2399 {"devices", &dev_fops},
2400 {"device_strs", &devstrs_fops},
2401 {"version", &version_fops}
2402 };
2403
2404 static int
2405 sg_proc_init(void)
2406 {
2407 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2408 int k;
2409
2410 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2411 if (!sg_proc_sgp)
2412 return 1;
2413 for (k = 0; k < num_leaves; ++k) {
2414 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2415 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2416 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2417 }
2418 return 0;
2419 }
2420
2421 static void
2422 sg_proc_cleanup(void)
2423 {
2424 int k;
2425 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2426
2427 if (!sg_proc_sgp)
2428 return;
2429 for (k = 0; k < num_leaves; ++k)
2430 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2431 remove_proc_entry(sg_proc_sg_dirname, NULL);
2432 }
2433
2434
2435 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2436 {
2437 seq_printf(s, "%d\n", *((int *)s->private));
2438 return 0;
2439 }
2440
2441 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2442 {
2443 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2444 }
2445
2446 static ssize_t
2447 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2448 size_t count, loff_t *off)
2449 {
2450 int err;
2451 unsigned long num;
2452
2453 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2454 return -EACCES;
2455 err = kstrtoul_from_user(buffer, count, 0, &num);
2456 if (err)
2457 return err;
2458 sg_allow_dio = num ? 1 : 0;
2459 return count;
2460 }
2461
2462 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2463 {
2464 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2465 }
2466
2467 static ssize_t
2468 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2469 size_t count, loff_t *off)
2470 {
2471 int err;
2472 unsigned long k = ULONG_MAX;
2473
2474 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2475 return -EACCES;
2476
2477 err = kstrtoul_from_user(buffer, count, 0, &k);
2478 if (err)
2479 return err;
2480 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2481 sg_big_buff = k;
2482 return count;
2483 }
2484 return -ERANGE;
2485 }
2486
2487 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2488 {
2489 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2490 sg_version_date);
2491 return 0;
2492 }
2493
2494 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2495 {
2496 return single_open(file, sg_proc_seq_show_version, NULL);
2497 }
2498
2499 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2500 {
2501 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
2502 return 0;
2503 }
2504
2505 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2506 {
2507 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2508 }
2509
2510 struct sg_proc_deviter {
2511 loff_t index;
2512 size_t max;
2513 };
2514
2515 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2516 {
2517 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2518
2519 s->private = it;
2520 if (! it)
2521 return NULL;
2522
2523 it->index = *pos;
2524 it->max = sg_last_dev();
2525 if (it->index >= it->max)
2526 return NULL;
2527 return it;
2528 }
2529
2530 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2531 {
2532 struct sg_proc_deviter * it = s->private;
2533
2534 *pos = ++it->index;
2535 return (it->index < it->max) ? it : NULL;
2536 }
2537
2538 static void dev_seq_stop(struct seq_file *s, void *v)
2539 {
2540 kfree(s->private);
2541 }
2542
2543 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2544 {
2545 return seq_open(file, &dev_seq_ops);
2546 }
2547
2548 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2549 {
2550 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2551 Sg_device *sdp;
2552 struct scsi_device *scsidp;
2553 unsigned long iflags;
2554
2555 read_lock_irqsave(&sg_index_lock, iflags);
2556 sdp = it ? sg_lookup_dev(it->index) : NULL;
2557 if ((NULL == sdp) || (NULL == sdp->device) ||
2558 (atomic_read(&sdp->detaching)))
2559 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2560 else {
2561 scsidp = sdp->device;
2562 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
2563 scsidp->host->host_no, scsidp->channel,
2564 scsidp->id, scsidp->lun, (int) scsidp->type,
2565 1,
2566 (int) scsidp->queue_depth,
2567 (int) atomic_read(&scsidp->device_busy),
2568 (int) scsi_device_online(scsidp));
2569 }
2570 read_unlock_irqrestore(&sg_index_lock, iflags);
2571 return 0;
2572 }
2573
2574 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2575 {
2576 return seq_open(file, &devstrs_seq_ops);
2577 }
2578
2579 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2580 {
2581 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2582 Sg_device *sdp;
2583 struct scsi_device *scsidp;
2584 unsigned long iflags;
2585
2586 read_lock_irqsave(&sg_index_lock, iflags);
2587 sdp = it ? sg_lookup_dev(it->index) : NULL;
2588 scsidp = sdp ? sdp->device : NULL;
2589 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
2590 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2591 scsidp->vendor, scsidp->model, scsidp->rev);
2592 else
2593 seq_puts(s, "<no active device>\n");
2594 read_unlock_irqrestore(&sg_index_lock, iflags);
2595 return 0;
2596 }
2597
2598 /* must be called while holding sg_index_lock */
2599 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2600 {
2601 int k, new_interface, blen, usg;
2602 Sg_request *srp;
2603 Sg_fd *fp;
2604 const sg_io_hdr_t *hp;
2605 const char * cp;
2606 unsigned int ms;
2607
2608 k = 0;
2609 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2610 k++;
2611 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2612 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2613 "(res)sgat=%d low_dma=%d\n", k,
2614 jiffies_to_msecs(fp->timeout),
2615 fp->reserve.bufflen,
2616 (int) fp->reserve.k_use_sg,
2617 (int) sdp->device->host->unchecked_isa_dma);
2618 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2619 (int) fp->cmd_q, (int) fp->force_packid,
2620 (int) fp->keep_orphan);
2621 list_for_each_entry(srp, &fp->rq_list, entry) {
2622 hp = &srp->header;
2623 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2624 if (srp->res_used) {
2625 if (new_interface &&
2626 (SG_FLAG_MMAP_IO & hp->flags))
2627 cp = " mmap>> ";
2628 else
2629 cp = " rb>> ";
2630 } else {
2631 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2632 cp = " dio>> ";
2633 else
2634 cp = " ";
2635 }
2636 seq_puts(s, cp);
2637 blen = srp->data.bufflen;
2638 usg = srp->data.k_use_sg;
2639 seq_puts(s, srp->done ?
2640 ((1 == srp->done) ? "rcv:" : "fin:")
2641 : "act:");
2642 seq_printf(s, " id=%d blen=%d",
2643 srp->header.pack_id, blen);
2644 if (srp->done)
2645 seq_printf(s, " dur=%d", hp->duration);
2646 else {
2647 ms = jiffies_to_msecs(jiffies);
2648 seq_printf(s, " t_o/elap=%d/%d",
2649 (new_interface ? hp->timeout :
2650 jiffies_to_msecs(fp->timeout)),
2651 (ms > hp->duration ? ms - hp->duration : 0));
2652 }
2653 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2654 (int) srp->data.cmd_opcode);
2655 }
2656 if (list_empty(&fp->rq_list))
2657 seq_puts(s, " No requests active\n");
2658 read_unlock(&fp->rq_list_lock);
2659 }
2660 }
2661
2662 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2663 {
2664 return seq_open(file, &debug_seq_ops);
2665 }
2666
2667 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2668 {
2669 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2670 Sg_device *sdp;
2671 unsigned long iflags;
2672
2673 if (it && (0 == it->index))
2674 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2675 (int)it->max, sg_big_buff);
2676
2677 read_lock_irqsave(&sg_index_lock, iflags);
2678 sdp = it ? sg_lookup_dev(it->index) : NULL;
2679 if (NULL == sdp)
2680 goto skip;
2681 read_lock(&sdp->sfd_lock);
2682 if (!list_empty(&sdp->sfds)) {
2683 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2684 if (atomic_read(&sdp->detaching))
2685 seq_puts(s, "detaching pending close ");
2686 else if (sdp->device) {
2687 struct scsi_device *scsidp = sdp->device;
2688
2689 seq_printf(s, "%d:%d:%d:%llu em=%d",
2690 scsidp->host->host_no,
2691 scsidp->channel, scsidp->id,
2692 scsidp->lun,
2693 scsidp->host->hostt->emulated);
2694 }
2695 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2696 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
2697 sg_proc_debug_helper(s, sdp);
2698 }
2699 read_unlock(&sdp->sfd_lock);
2700 skip:
2701 read_unlock_irqrestore(&sg_index_lock, iflags);
2702 return 0;
2703 }
2704
2705 #endif /* CONFIG_SCSI_PROC_FS */
2706
2707 module_init(init_sg);
2708 module_exit(exit_sg);