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Merge branch 'for-linus-4.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / sg.c
1 /*
2 * History:
3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
4 * to allow user process control of SCSI devices.
5 * Development Sponsored by Killy Corp. NY NY
6 *
7 * Original driver (sg.c):
8 * Copyright (C) 1992 Lawrence Foard
9 * Version 2 and 3 extensions to driver:
10 * Copyright (C) 1998 - 2014 Douglas Gilbert
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 */
18
19 static int sg_version_num = 30536; /* 2 digits for each component */
20 #define SG_VERSION_STR "3.5.36"
21
22 /*
23 * D. P. Gilbert (dgilbert@interlog.com), notes:
24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
26 * (otherwise the macros compile to empty statements).
27 *
28 */
29 #include <linux/module.h>
30
31 #include <linux/fs.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/string.h>
35 #include <linux/mm.h>
36 #include <linux/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, blk_status_t status);
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 int
755 sg_common_write(Sg_fd * sfp, Sg_request * srp,
756 unsigned char *cmnd, int timeout, int blocking)
757 {
758 int k, at_head;
759 Sg_device *sdp = sfp->parentdp;
760 sg_io_hdr_t *hp = &srp->header;
761
762 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
763 hp->status = 0;
764 hp->masked_status = 0;
765 hp->msg_status = 0;
766 hp->info = 0;
767 hp->host_status = 0;
768 hp->driver_status = 0;
769 hp->resid = 0;
770 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
771 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
772 (int) cmnd[0], (int) hp->cmd_len));
773
774 if (hp->dxfer_len >= SZ_256M)
775 return -EINVAL;
776
777 k = sg_start_req(srp, cmnd);
778 if (k) {
779 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
780 "sg_common_write: start_req err=%d\n", k));
781 sg_finish_rem_req(srp);
782 sg_remove_request(sfp, srp);
783 return k; /* probably out of space --> ENOMEM */
784 }
785 if (atomic_read(&sdp->detaching)) {
786 if (srp->bio) {
787 scsi_req_free_cmd(scsi_req(srp->rq));
788 blk_end_request_all(srp->rq, BLK_STS_IOERR);
789 srp->rq = NULL;
790 }
791
792 sg_finish_rem_req(srp);
793 sg_remove_request(sfp, srp);
794 return -ENODEV;
795 }
796
797 hp->duration = jiffies_to_msecs(jiffies);
798 if (hp->interface_id != '\0' && /* v3 (or later) interface */
799 (SG_FLAG_Q_AT_TAIL & hp->flags))
800 at_head = 0;
801 else
802 at_head = 1;
803
804 srp->rq->timeout = timeout;
805 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
806 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
807 srp->rq, at_head, sg_rq_end_io);
808 return 0;
809 }
810
811 static int srp_done(Sg_fd *sfp, Sg_request *srp)
812 {
813 unsigned long flags;
814 int ret;
815
816 read_lock_irqsave(&sfp->rq_list_lock, flags);
817 ret = srp->done;
818 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
819 return ret;
820 }
821
822 static int max_sectors_bytes(struct request_queue *q)
823 {
824 unsigned int max_sectors = queue_max_sectors(q);
825
826 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
827
828 return max_sectors << 9;
829 }
830
831 static long
832 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
833 {
834 void __user *p = (void __user *)arg;
835 int __user *ip = p;
836 int result, val, read_only;
837 Sg_device *sdp;
838 Sg_fd *sfp;
839 Sg_request *srp;
840 unsigned long iflags;
841
842 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
843 return -ENXIO;
844
845 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
846 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
847 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
848
849 switch (cmd_in) {
850 case SG_IO:
851 if (atomic_read(&sdp->detaching))
852 return -ENODEV;
853 if (!scsi_block_when_processing_errors(sdp->device))
854 return -ENXIO;
855 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
856 return -EFAULT;
857 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
858 1, read_only, 1, &srp);
859 if (result < 0)
860 return result;
861 result = wait_event_interruptible(sfp->read_wait,
862 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
863 if (atomic_read(&sdp->detaching))
864 return -ENODEV;
865 write_lock_irq(&sfp->rq_list_lock);
866 if (srp->done) {
867 srp->done = 2;
868 write_unlock_irq(&sfp->rq_list_lock);
869 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
870 return (result < 0) ? result : 0;
871 }
872 srp->orphan = 1;
873 write_unlock_irq(&sfp->rq_list_lock);
874 return result; /* -ERESTARTSYS because signal hit process */
875 case SG_SET_TIMEOUT:
876 result = get_user(val, ip);
877 if (result)
878 return result;
879 if (val < 0)
880 return -EIO;
881 if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ))
882 val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ),
883 INT_MAX);
884 sfp->timeout_user = val;
885 sfp->timeout = mult_frac(val, HZ, USER_HZ);
886
887 return 0;
888 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
889 /* strange ..., for backward compatibility */
890 return sfp->timeout_user;
891 case SG_SET_FORCE_LOW_DMA:
892 /*
893 * N.B. This ioctl never worked properly, but failed to
894 * return an error value. So returning '0' to keep compability
895 * with legacy applications.
896 */
897 return 0;
898 case SG_GET_LOW_DMA:
899 return put_user((int) sdp->device->host->unchecked_isa_dma, ip);
900 case SG_GET_SCSI_ID:
901 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
902 return -EFAULT;
903 else {
904 sg_scsi_id_t __user *sg_idp = p;
905
906 if (atomic_read(&sdp->detaching))
907 return -ENODEV;
908 __put_user((int) sdp->device->host->host_no,
909 &sg_idp->host_no);
910 __put_user((int) sdp->device->channel,
911 &sg_idp->channel);
912 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
913 __put_user((int) sdp->device->lun, &sg_idp->lun);
914 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
915 __put_user((short) sdp->device->host->cmd_per_lun,
916 &sg_idp->h_cmd_per_lun);
917 __put_user((short) sdp->device->queue_depth,
918 &sg_idp->d_queue_depth);
919 __put_user(0, &sg_idp->unused[0]);
920 __put_user(0, &sg_idp->unused[1]);
921 return 0;
922 }
923 case SG_SET_FORCE_PACK_ID:
924 result = get_user(val, ip);
925 if (result)
926 return result;
927 sfp->force_packid = val ? 1 : 0;
928 return 0;
929 case SG_GET_PACK_ID:
930 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
931 return -EFAULT;
932 read_lock_irqsave(&sfp->rq_list_lock, iflags);
933 list_for_each_entry(srp, &sfp->rq_list, entry) {
934 if ((1 == srp->done) && (!srp->sg_io_owned)) {
935 read_unlock_irqrestore(&sfp->rq_list_lock,
936 iflags);
937 __put_user(srp->header.pack_id, ip);
938 return 0;
939 }
940 }
941 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
942 __put_user(-1, ip);
943 return 0;
944 case SG_GET_NUM_WAITING:
945 read_lock_irqsave(&sfp->rq_list_lock, iflags);
946 val = 0;
947 list_for_each_entry(srp, &sfp->rq_list, entry) {
948 if ((1 == srp->done) && (!srp->sg_io_owned))
949 ++val;
950 }
951 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
952 return put_user(val, ip);
953 case SG_GET_SG_TABLESIZE:
954 return put_user(sdp->sg_tablesize, ip);
955 case SG_SET_RESERVED_SIZE:
956 result = get_user(val, ip);
957 if (result)
958 return result;
959 if (val < 0)
960 return -EINVAL;
961 val = min_t(int, val,
962 max_sectors_bytes(sdp->device->request_queue));
963 mutex_lock(&sfp->f_mutex);
964 if (val != sfp->reserve.bufflen) {
965 if (sfp->mmap_called ||
966 sfp->res_in_use) {
967 mutex_unlock(&sfp->f_mutex);
968 return -EBUSY;
969 }
970
971 sg_remove_scat(sfp, &sfp->reserve);
972 sg_build_reserve(sfp, val);
973 }
974 mutex_unlock(&sfp->f_mutex);
975 return 0;
976 case SG_GET_RESERVED_SIZE:
977 val = min_t(int, sfp->reserve.bufflen,
978 max_sectors_bytes(sdp->device->request_queue));
979 return put_user(val, ip);
980 case SG_SET_COMMAND_Q:
981 result = get_user(val, ip);
982 if (result)
983 return result;
984 sfp->cmd_q = val ? 1 : 0;
985 return 0;
986 case SG_GET_COMMAND_Q:
987 return put_user((int) sfp->cmd_q, ip);
988 case SG_SET_KEEP_ORPHAN:
989 result = get_user(val, ip);
990 if (result)
991 return result;
992 sfp->keep_orphan = val;
993 return 0;
994 case SG_GET_KEEP_ORPHAN:
995 return put_user((int) sfp->keep_orphan, ip);
996 case SG_NEXT_CMD_LEN:
997 result = get_user(val, ip);
998 if (result)
999 return result;
1000 if (val > SG_MAX_CDB_SIZE)
1001 return -ENOMEM;
1002 sfp->next_cmd_len = (val > 0) ? val : 0;
1003 return 0;
1004 case SG_GET_VERSION_NUM:
1005 return put_user(sg_version_num, ip);
1006 case SG_GET_ACCESS_COUNT:
1007 /* faked - we don't have a real access count anymore */
1008 val = (sdp->device ? 1 : 0);
1009 return put_user(val, ip);
1010 case SG_GET_REQUEST_TABLE:
1011 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1012 return -EFAULT;
1013 else {
1014 sg_req_info_t *rinfo;
1015 unsigned int ms;
1016
1017 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1018 GFP_KERNEL);
1019 if (!rinfo)
1020 return -ENOMEM;
1021 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1022 val = 0;
1023 list_for_each_entry(srp, &sfp->rq_list, entry) {
1024 if (val > SG_MAX_QUEUE)
1025 break;
1026 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1027 rinfo[val].req_state = srp->done + 1;
1028 rinfo[val].problem =
1029 srp->header.masked_status &
1030 srp->header.host_status &
1031 srp->header.driver_status;
1032 if (srp->done)
1033 rinfo[val].duration =
1034 srp->header.duration;
1035 else {
1036 ms = jiffies_to_msecs(jiffies);
1037 rinfo[val].duration =
1038 (ms > srp->header.duration) ?
1039 (ms - srp->header.duration) : 0;
1040 }
1041 rinfo[val].orphan = srp->orphan;
1042 rinfo[val].sg_io_owned = srp->sg_io_owned;
1043 rinfo[val].pack_id = srp->header.pack_id;
1044 rinfo[val].usr_ptr = srp->header.usr_ptr;
1045 val++;
1046 }
1047 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1048 result = __copy_to_user(p, rinfo,
1049 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1050 result = result ? -EFAULT : 0;
1051 kfree(rinfo);
1052 return result;
1053 }
1054 case SG_EMULATED_HOST:
1055 if (atomic_read(&sdp->detaching))
1056 return -ENODEV;
1057 return put_user(sdp->device->host->hostt->emulated, ip);
1058 case SCSI_IOCTL_SEND_COMMAND:
1059 if (atomic_read(&sdp->detaching))
1060 return -ENODEV;
1061 if (read_only) {
1062 unsigned char opcode = WRITE_6;
1063 Scsi_Ioctl_Command __user *siocp = p;
1064
1065 if (copy_from_user(&opcode, siocp->data, 1))
1066 return -EFAULT;
1067 if (sg_allow_access(filp, &opcode))
1068 return -EPERM;
1069 }
1070 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1071 case SG_SET_DEBUG:
1072 result = get_user(val, ip);
1073 if (result)
1074 return result;
1075 sdp->sgdebug = (char) val;
1076 return 0;
1077 case BLKSECTGET:
1078 return put_user(max_sectors_bytes(sdp->device->request_queue),
1079 ip);
1080 case BLKTRACESETUP:
1081 return blk_trace_setup(sdp->device->request_queue,
1082 sdp->disk->disk_name,
1083 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1084 NULL,
1085 (char *)arg);
1086 case BLKTRACESTART:
1087 return blk_trace_startstop(sdp->device->request_queue, 1);
1088 case BLKTRACESTOP:
1089 return blk_trace_startstop(sdp->device->request_queue, 0);
1090 case BLKTRACETEARDOWN:
1091 return blk_trace_remove(sdp->device->request_queue);
1092 case SCSI_IOCTL_GET_IDLUN:
1093 case SCSI_IOCTL_GET_BUS_NUMBER:
1094 case SCSI_IOCTL_PROBE_HOST:
1095 case SG_GET_TRANSFORM:
1096 case SG_SCSI_RESET:
1097 if (atomic_read(&sdp->detaching))
1098 return -ENODEV;
1099 break;
1100 default:
1101 if (read_only)
1102 return -EPERM; /* don't know so take safe approach */
1103 break;
1104 }
1105
1106 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1107 cmd_in, filp->f_flags & O_NDELAY);
1108 if (result)
1109 return result;
1110 return scsi_ioctl(sdp->device, cmd_in, p);
1111 }
1112
1113 #ifdef CONFIG_COMPAT
1114 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1115 {
1116 Sg_device *sdp;
1117 Sg_fd *sfp;
1118 struct scsi_device *sdev;
1119
1120 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1121 return -ENXIO;
1122
1123 sdev = sdp->device;
1124 if (sdev->host->hostt->compat_ioctl) {
1125 int ret;
1126
1127 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1128
1129 return ret;
1130 }
1131
1132 return -ENOIOCTLCMD;
1133 }
1134 #endif
1135
1136 static unsigned int
1137 sg_poll(struct file *filp, poll_table * wait)
1138 {
1139 unsigned int res = 0;
1140 Sg_device *sdp;
1141 Sg_fd *sfp;
1142 Sg_request *srp;
1143 int count = 0;
1144 unsigned long iflags;
1145
1146 sfp = filp->private_data;
1147 if (!sfp)
1148 return POLLERR;
1149 sdp = sfp->parentdp;
1150 if (!sdp)
1151 return POLLERR;
1152 poll_wait(filp, &sfp->read_wait, wait);
1153 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1154 list_for_each_entry(srp, &sfp->rq_list, entry) {
1155 /* if any read waiting, flag it */
1156 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1157 res = POLLIN | POLLRDNORM;
1158 ++count;
1159 }
1160 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1161
1162 if (atomic_read(&sdp->detaching))
1163 res |= POLLHUP;
1164 else if (!sfp->cmd_q) {
1165 if (0 == count)
1166 res |= POLLOUT | POLLWRNORM;
1167 } else if (count < SG_MAX_QUEUE)
1168 res |= POLLOUT | POLLWRNORM;
1169 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1170 "sg_poll: res=0x%x\n", (int) res));
1171 return res;
1172 }
1173
1174 static int
1175 sg_fasync(int fd, struct file *filp, int mode)
1176 {
1177 Sg_device *sdp;
1178 Sg_fd *sfp;
1179
1180 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1181 return -ENXIO;
1182 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1183 "sg_fasync: mode=%d\n", mode));
1184
1185 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1186 }
1187
1188 static int
1189 sg_vma_fault(struct vm_fault *vmf)
1190 {
1191 struct vm_area_struct *vma = vmf->vma;
1192 Sg_fd *sfp;
1193 unsigned long offset, len, sa;
1194 Sg_scatter_hold *rsv_schp;
1195 int k, length;
1196
1197 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1198 return VM_FAULT_SIGBUS;
1199 rsv_schp = &sfp->reserve;
1200 offset = vmf->pgoff << PAGE_SHIFT;
1201 if (offset >= rsv_schp->bufflen)
1202 return VM_FAULT_SIGBUS;
1203 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1204 "sg_vma_fault: offset=%lu, scatg=%d\n",
1205 offset, rsv_schp->k_use_sg));
1206 sa = vma->vm_start;
1207 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1208 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1209 len = vma->vm_end - sa;
1210 len = (len < length) ? len : length;
1211 if (offset < len) {
1212 struct page *page = nth_page(rsv_schp->pages[k],
1213 offset >> PAGE_SHIFT);
1214 get_page(page); /* increment page count */
1215 vmf->page = page;
1216 return 0; /* success */
1217 }
1218 sa += len;
1219 offset -= len;
1220 }
1221
1222 return VM_FAULT_SIGBUS;
1223 }
1224
1225 static const struct vm_operations_struct sg_mmap_vm_ops = {
1226 .fault = sg_vma_fault,
1227 };
1228
1229 static int
1230 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1231 {
1232 Sg_fd *sfp;
1233 unsigned long req_sz, len, sa;
1234 Sg_scatter_hold *rsv_schp;
1235 int k, length;
1236
1237 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1238 return -ENXIO;
1239 req_sz = vma->vm_end - vma->vm_start;
1240 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1241 "sg_mmap starting, vm_start=%p, len=%d\n",
1242 (void *) vma->vm_start, (int) req_sz));
1243 if (vma->vm_pgoff)
1244 return -EINVAL; /* want no offset */
1245 rsv_schp = &sfp->reserve;
1246 if (req_sz > rsv_schp->bufflen)
1247 return -ENOMEM; /* cannot map more than reserved buffer */
1248
1249 sa = vma->vm_start;
1250 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1251 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1252 len = vma->vm_end - sa;
1253 len = (len < length) ? len : length;
1254 sa += len;
1255 }
1256
1257 sfp->mmap_called = 1;
1258 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1259 vma->vm_private_data = sfp;
1260 vma->vm_ops = &sg_mmap_vm_ops;
1261 return 0;
1262 }
1263
1264 static void
1265 sg_rq_end_io_usercontext(struct work_struct *work)
1266 {
1267 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1268 struct sg_fd *sfp = srp->parentfp;
1269
1270 sg_finish_rem_req(srp);
1271 sg_remove_request(sfp, srp);
1272 kref_put(&sfp->f_ref, sg_remove_sfp);
1273 }
1274
1275 /*
1276 * This function is a "bottom half" handler that is called by the mid
1277 * level when a command is completed (or has failed).
1278 */
1279 static void
1280 sg_rq_end_io(struct request *rq, blk_status_t status)
1281 {
1282 struct sg_request *srp = rq->end_io_data;
1283 struct scsi_request *req = scsi_req(rq);
1284 Sg_device *sdp;
1285 Sg_fd *sfp;
1286 unsigned long iflags;
1287 unsigned int ms;
1288 char *sense;
1289 int result, resid, done = 1;
1290
1291 if (WARN_ON(srp->done != 0))
1292 return;
1293
1294 sfp = srp->parentfp;
1295 if (WARN_ON(sfp == NULL))
1296 return;
1297
1298 sdp = sfp->parentdp;
1299 if (unlikely(atomic_read(&sdp->detaching)))
1300 pr_info("%s: device detaching\n", __func__);
1301
1302 sense = req->sense;
1303 result = req->result;
1304 resid = req->resid_len;
1305
1306 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1307 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1308 srp->header.pack_id, result));
1309 srp->header.resid = resid;
1310 ms = jiffies_to_msecs(jiffies);
1311 srp->header.duration = (ms > srp->header.duration) ?
1312 (ms - srp->header.duration) : 0;
1313 if (0 != result) {
1314 struct scsi_sense_hdr sshdr;
1315
1316 srp->header.status = 0xff & result;
1317 srp->header.masked_status = status_byte(result);
1318 srp->header.msg_status = msg_byte(result);
1319 srp->header.host_status = host_byte(result);
1320 srp->header.driver_status = driver_byte(result);
1321 if ((sdp->sgdebug > 0) &&
1322 ((CHECK_CONDITION == srp->header.masked_status) ||
1323 (COMMAND_TERMINATED == srp->header.masked_status)))
1324 __scsi_print_sense(sdp->device, __func__, sense,
1325 SCSI_SENSE_BUFFERSIZE);
1326
1327 /* Following if statement is a patch supplied by Eric Youngdale */
1328 if (driver_byte(result) != 0
1329 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1330 && !scsi_sense_is_deferred(&sshdr)
1331 && sshdr.sense_key == UNIT_ATTENTION
1332 && sdp->device->removable) {
1333 /* Detected possible disc change. Set the bit - this */
1334 /* may be used if there are filesystems using this device */
1335 sdp->device->changed = 1;
1336 }
1337 }
1338
1339 if (req->sense_len)
1340 memcpy(srp->sense_b, req->sense, SCSI_SENSE_BUFFERSIZE);
1341
1342 /* Rely on write phase to clean out srp status values, so no "else" */
1343
1344 /*
1345 * Free the request as soon as it is complete so that its resources
1346 * can be reused without waiting for userspace to read() the
1347 * result. But keep the associated bio (if any) around until
1348 * blk_rq_unmap_user() can be called from user context.
1349 */
1350 srp->rq = NULL;
1351 scsi_req_free_cmd(scsi_req(rq));
1352 __blk_put_request(rq->q, rq);
1353
1354 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1355 if (unlikely(srp->orphan)) {
1356 if (sfp->keep_orphan)
1357 srp->sg_io_owned = 0;
1358 else
1359 done = 0;
1360 }
1361 srp->done = done;
1362 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1363
1364 if (likely(done)) {
1365 /* Now wake up any sg_read() that is waiting for this
1366 * packet.
1367 */
1368 wake_up_interruptible(&sfp->read_wait);
1369 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1370 kref_put(&sfp->f_ref, sg_remove_sfp);
1371 } else {
1372 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1373 schedule_work(&srp->ew.work);
1374 }
1375 }
1376
1377 static const struct file_operations sg_fops = {
1378 .owner = THIS_MODULE,
1379 .read = sg_read,
1380 .write = sg_write,
1381 .poll = sg_poll,
1382 .unlocked_ioctl = sg_ioctl,
1383 #ifdef CONFIG_COMPAT
1384 .compat_ioctl = sg_compat_ioctl,
1385 #endif
1386 .open = sg_open,
1387 .mmap = sg_mmap,
1388 .release = sg_release,
1389 .fasync = sg_fasync,
1390 .llseek = no_llseek,
1391 };
1392
1393 static struct class *sg_sysfs_class;
1394
1395 static int sg_sysfs_valid = 0;
1396
1397 static Sg_device *
1398 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1399 {
1400 struct request_queue *q = scsidp->request_queue;
1401 Sg_device *sdp;
1402 unsigned long iflags;
1403 int error;
1404 u32 k;
1405
1406 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1407 if (!sdp) {
1408 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1409 "failure\n", __func__);
1410 return ERR_PTR(-ENOMEM);
1411 }
1412
1413 idr_preload(GFP_KERNEL);
1414 write_lock_irqsave(&sg_index_lock, iflags);
1415
1416 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1417 if (error < 0) {
1418 if (error == -ENOSPC) {
1419 sdev_printk(KERN_WARNING, scsidp,
1420 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1421 scsidp->type, SG_MAX_DEVS - 1);
1422 error = -ENODEV;
1423 } else {
1424 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1425 "allocation Sg_device failure: %d\n",
1426 __func__, error);
1427 }
1428 goto out_unlock;
1429 }
1430 k = error;
1431
1432 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1433 "sg_alloc: dev=%d \n", k));
1434 sprintf(disk->disk_name, "sg%d", k);
1435 disk->first_minor = k;
1436 sdp->disk = disk;
1437 sdp->device = scsidp;
1438 mutex_init(&sdp->open_rel_lock);
1439 INIT_LIST_HEAD(&sdp->sfds);
1440 init_waitqueue_head(&sdp->open_wait);
1441 atomic_set(&sdp->detaching, 0);
1442 rwlock_init(&sdp->sfd_lock);
1443 sdp->sg_tablesize = queue_max_segments(q);
1444 sdp->index = k;
1445 kref_init(&sdp->d_ref);
1446 error = 0;
1447
1448 out_unlock:
1449 write_unlock_irqrestore(&sg_index_lock, iflags);
1450 idr_preload_end();
1451
1452 if (error) {
1453 kfree(sdp);
1454 return ERR_PTR(error);
1455 }
1456 return sdp;
1457 }
1458
1459 static int
1460 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1461 {
1462 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1463 struct gendisk *disk;
1464 Sg_device *sdp = NULL;
1465 struct cdev * cdev = NULL;
1466 int error;
1467 unsigned long iflags;
1468
1469 disk = alloc_disk(1);
1470 if (!disk) {
1471 pr_warn("%s: alloc_disk failed\n", __func__);
1472 return -ENOMEM;
1473 }
1474 disk->major = SCSI_GENERIC_MAJOR;
1475
1476 error = -ENOMEM;
1477 cdev = cdev_alloc();
1478 if (!cdev) {
1479 pr_warn("%s: cdev_alloc failed\n", __func__);
1480 goto out;
1481 }
1482 cdev->owner = THIS_MODULE;
1483 cdev->ops = &sg_fops;
1484
1485 sdp = sg_alloc(disk, scsidp);
1486 if (IS_ERR(sdp)) {
1487 pr_warn("%s: sg_alloc failed\n", __func__);
1488 error = PTR_ERR(sdp);
1489 goto out;
1490 }
1491
1492 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1493 if (error)
1494 goto cdev_add_err;
1495
1496 sdp->cdev = cdev;
1497 if (sg_sysfs_valid) {
1498 struct device *sg_class_member;
1499
1500 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1501 MKDEV(SCSI_GENERIC_MAJOR,
1502 sdp->index),
1503 sdp, "%s", disk->disk_name);
1504 if (IS_ERR(sg_class_member)) {
1505 pr_err("%s: device_create failed\n", __func__);
1506 error = PTR_ERR(sg_class_member);
1507 goto cdev_add_err;
1508 }
1509 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1510 &sg_class_member->kobj, "generic");
1511 if (error)
1512 pr_err("%s: unable to make symlink 'generic' back "
1513 "to sg%d\n", __func__, sdp->index);
1514 } else
1515 pr_warn("%s: sg_sys Invalid\n", __func__);
1516
1517 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1518 "type %d\n", sdp->index, scsidp->type);
1519
1520 dev_set_drvdata(cl_dev, sdp);
1521
1522 return 0;
1523
1524 cdev_add_err:
1525 write_lock_irqsave(&sg_index_lock, iflags);
1526 idr_remove(&sg_index_idr, sdp->index);
1527 write_unlock_irqrestore(&sg_index_lock, iflags);
1528 kfree(sdp);
1529
1530 out:
1531 put_disk(disk);
1532 if (cdev)
1533 cdev_del(cdev);
1534 return error;
1535 }
1536
1537 static void
1538 sg_device_destroy(struct kref *kref)
1539 {
1540 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1541 unsigned long flags;
1542
1543 /* CAUTION! Note that the device can still be found via idr_find()
1544 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1545 * any other cleanup.
1546 */
1547
1548 write_lock_irqsave(&sg_index_lock, flags);
1549 idr_remove(&sg_index_idr, sdp->index);
1550 write_unlock_irqrestore(&sg_index_lock, flags);
1551
1552 SCSI_LOG_TIMEOUT(3,
1553 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
1554
1555 put_disk(sdp->disk);
1556 kfree(sdp);
1557 }
1558
1559 static void
1560 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1561 {
1562 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1563 Sg_device *sdp = dev_get_drvdata(cl_dev);
1564 unsigned long iflags;
1565 Sg_fd *sfp;
1566 int val;
1567
1568 if (!sdp)
1569 return;
1570 /* want sdp->detaching non-zero as soon as possible */
1571 val = atomic_inc_return(&sdp->detaching);
1572 if (val > 1)
1573 return; /* only want to do following once per device */
1574
1575 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1576 "%s\n", __func__));
1577
1578 read_lock_irqsave(&sdp->sfd_lock, iflags);
1579 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1580 wake_up_interruptible_all(&sfp->read_wait);
1581 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1582 }
1583 wake_up_interruptible_all(&sdp->open_wait);
1584 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1585
1586 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1587 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1588 cdev_del(sdp->cdev);
1589 sdp->cdev = NULL;
1590
1591 kref_put(&sdp->d_ref, sg_device_destroy);
1592 }
1593
1594 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1595 module_param_named(def_reserved_size, def_reserved_size, int,
1596 S_IRUGO | S_IWUSR);
1597 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1598
1599 MODULE_AUTHOR("Douglas Gilbert");
1600 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1601 MODULE_LICENSE("GPL");
1602 MODULE_VERSION(SG_VERSION_STR);
1603 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1604
1605 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1606 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1607 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1608 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1609
1610 static int __init
1611 init_sg(void)
1612 {
1613 int rc;
1614
1615 if (scatter_elem_sz < PAGE_SIZE) {
1616 scatter_elem_sz = PAGE_SIZE;
1617 scatter_elem_sz_prev = scatter_elem_sz;
1618 }
1619 if (def_reserved_size >= 0)
1620 sg_big_buff = def_reserved_size;
1621 else
1622 def_reserved_size = sg_big_buff;
1623
1624 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1625 SG_MAX_DEVS, "sg");
1626 if (rc)
1627 return rc;
1628 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1629 if ( IS_ERR(sg_sysfs_class) ) {
1630 rc = PTR_ERR(sg_sysfs_class);
1631 goto err_out;
1632 }
1633 sg_sysfs_valid = 1;
1634 rc = scsi_register_interface(&sg_interface);
1635 if (0 == rc) {
1636 #ifdef CONFIG_SCSI_PROC_FS
1637 sg_proc_init();
1638 #endif /* CONFIG_SCSI_PROC_FS */
1639 return 0;
1640 }
1641 class_destroy(sg_sysfs_class);
1642 err_out:
1643 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1644 return rc;
1645 }
1646
1647 static void __exit
1648 exit_sg(void)
1649 {
1650 #ifdef CONFIG_SCSI_PROC_FS
1651 sg_proc_cleanup();
1652 #endif /* CONFIG_SCSI_PROC_FS */
1653 scsi_unregister_interface(&sg_interface);
1654 class_destroy(sg_sysfs_class);
1655 sg_sysfs_valid = 0;
1656 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1657 SG_MAX_DEVS);
1658 idr_destroy(&sg_index_idr);
1659 }
1660
1661 static int
1662 sg_start_req(Sg_request *srp, unsigned char *cmd)
1663 {
1664 int res;
1665 struct request *rq;
1666 struct scsi_request *req;
1667 Sg_fd *sfp = srp->parentfp;
1668 sg_io_hdr_t *hp = &srp->header;
1669 int dxfer_len = (int) hp->dxfer_len;
1670 int dxfer_dir = hp->dxfer_direction;
1671 unsigned int iov_count = hp->iovec_count;
1672 Sg_scatter_hold *req_schp = &srp->data;
1673 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1674 struct request_queue *q = sfp->parentdp->device->request_queue;
1675 struct rq_map_data *md, map_data;
1676 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1677 unsigned char *long_cmdp = NULL;
1678
1679 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1680 "sg_start_req: dxfer_len=%d\n",
1681 dxfer_len));
1682
1683 if (hp->cmd_len > BLK_MAX_CDB) {
1684 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1685 if (!long_cmdp)
1686 return -ENOMEM;
1687 }
1688
1689 /*
1690 * NOTE
1691 *
1692 * With scsi-mq enabled, there are a fixed number of preallocated
1693 * requests equal in number to shost->can_queue. If all of the
1694 * preallocated requests are already in use, then using GFP_ATOMIC with
1695 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1696 * will cause blk_get_request() to sleep until an active command
1697 * completes, freeing up a request. Neither option is ideal, but
1698 * GFP_KERNEL is the better choice to prevent userspace from getting an
1699 * unexpected EWOULDBLOCK.
1700 *
1701 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1702 * does not sleep except under memory pressure.
1703 */
1704 rq = blk_get_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ?
1705 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, GFP_KERNEL);
1706 if (IS_ERR(rq)) {
1707 kfree(long_cmdp);
1708 return PTR_ERR(rq);
1709 }
1710 req = scsi_req(rq);
1711
1712 if (hp->cmd_len > BLK_MAX_CDB)
1713 req->cmd = long_cmdp;
1714 memcpy(req->cmd, cmd, hp->cmd_len);
1715 req->cmd_len = hp->cmd_len;
1716
1717 srp->rq = rq;
1718 rq->end_io_data = srp;
1719 req->retries = SG_DEFAULT_RETRIES;
1720
1721 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1722 return 0;
1723
1724 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1725 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1726 !sfp->parentdp->device->host->unchecked_isa_dma &&
1727 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1728 md = NULL;
1729 else
1730 md = &map_data;
1731
1732 if (md) {
1733 mutex_lock(&sfp->f_mutex);
1734 if (dxfer_len <= rsv_schp->bufflen &&
1735 !sfp->res_in_use) {
1736 sfp->res_in_use = 1;
1737 sg_link_reserve(sfp, srp, dxfer_len);
1738 } else if ((hp->flags & SG_FLAG_MMAP_IO) && sfp->res_in_use) {
1739 mutex_unlock(&sfp->f_mutex);
1740 return -EBUSY;
1741 } else {
1742 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1743 if (res) {
1744 mutex_unlock(&sfp->f_mutex);
1745 return res;
1746 }
1747 }
1748 mutex_unlock(&sfp->f_mutex);
1749
1750 md->pages = req_schp->pages;
1751 md->page_order = req_schp->page_order;
1752 md->nr_entries = req_schp->k_use_sg;
1753 md->offset = 0;
1754 md->null_mapped = hp->dxferp ? 0 : 1;
1755 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1756 md->from_user = 1;
1757 else
1758 md->from_user = 0;
1759 }
1760
1761 if (iov_count) {
1762 struct iovec *iov = NULL;
1763 struct iov_iter i;
1764
1765 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
1766 if (res < 0)
1767 return res;
1768
1769 iov_iter_truncate(&i, hp->dxfer_len);
1770 if (!iov_iter_count(&i)) {
1771 kfree(iov);
1772 return -EINVAL;
1773 }
1774
1775 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
1776 kfree(iov);
1777 } else
1778 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1779 hp->dxfer_len, GFP_ATOMIC);
1780
1781 if (!res) {
1782 srp->bio = rq->bio;
1783
1784 if (!md) {
1785 req_schp->dio_in_use = 1;
1786 hp->info |= SG_INFO_DIRECT_IO;
1787 }
1788 }
1789 return res;
1790 }
1791
1792 static int
1793 sg_finish_rem_req(Sg_request *srp)
1794 {
1795 int ret = 0;
1796
1797 Sg_fd *sfp = srp->parentfp;
1798 Sg_scatter_hold *req_schp = &srp->data;
1799
1800 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1801 "sg_finish_rem_req: res_used=%d\n",
1802 (int) srp->res_used));
1803 if (srp->bio)
1804 ret = blk_rq_unmap_user(srp->bio);
1805
1806 if (srp->rq) {
1807 scsi_req_free_cmd(scsi_req(srp->rq));
1808 blk_put_request(srp->rq);
1809 }
1810
1811 if (srp->res_used)
1812 sg_unlink_reserve(sfp, srp);
1813 else
1814 sg_remove_scat(sfp, req_schp);
1815
1816 return ret;
1817 }
1818
1819 static int
1820 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1821 {
1822 int sg_bufflen = tablesize * sizeof(struct page *);
1823 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1824
1825 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1826 if (!schp->pages)
1827 return -ENOMEM;
1828 schp->sglist_len = sg_bufflen;
1829 return tablesize; /* number of scat_gath elements allocated */
1830 }
1831
1832 static int
1833 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1834 {
1835 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1836 int sg_tablesize = sfp->parentdp->sg_tablesize;
1837 int blk_size = buff_size, order;
1838 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1839 struct sg_device *sdp = sfp->parentdp;
1840
1841 if (blk_size < 0)
1842 return -EFAULT;
1843 if (0 == blk_size)
1844 ++blk_size; /* don't know why */
1845 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1846 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1847 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1848 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1849 buff_size, blk_size));
1850
1851 /* N.B. ret_sz carried into this block ... */
1852 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1853 if (mx_sc_elems < 0)
1854 return mx_sc_elems; /* most likely -ENOMEM */
1855
1856 num = scatter_elem_sz;
1857 if (unlikely(num != scatter_elem_sz_prev)) {
1858 if (num < PAGE_SIZE) {
1859 scatter_elem_sz = PAGE_SIZE;
1860 scatter_elem_sz_prev = PAGE_SIZE;
1861 } else
1862 scatter_elem_sz_prev = num;
1863 }
1864
1865 if (sdp->device->host->unchecked_isa_dma)
1866 gfp_mask |= GFP_DMA;
1867
1868 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1869 gfp_mask |= __GFP_ZERO;
1870
1871 order = get_order(num);
1872 retry:
1873 ret_sz = 1 << (PAGE_SHIFT + order);
1874
1875 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1876 k++, rem_sz -= ret_sz) {
1877
1878 num = (rem_sz > scatter_elem_sz_prev) ?
1879 scatter_elem_sz_prev : rem_sz;
1880
1881 schp->pages[k] = alloc_pages(gfp_mask, order);
1882 if (!schp->pages[k])
1883 goto out;
1884
1885 if (num == scatter_elem_sz_prev) {
1886 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1887 scatter_elem_sz = ret_sz;
1888 scatter_elem_sz_prev = ret_sz;
1889 }
1890 }
1891
1892 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1893 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1894 k, num, ret_sz));
1895 } /* end of for loop */
1896
1897 schp->page_order = order;
1898 schp->k_use_sg = k;
1899 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1900 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1901 k, rem_sz));
1902
1903 schp->bufflen = blk_size;
1904 if (rem_sz > 0) /* must have failed */
1905 return -ENOMEM;
1906 return 0;
1907 out:
1908 for (i = 0; i < k; i++)
1909 __free_pages(schp->pages[i], order);
1910
1911 if (--order >= 0)
1912 goto retry;
1913
1914 return -ENOMEM;
1915 }
1916
1917 static void
1918 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1919 {
1920 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1921 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1922 if (schp->pages && schp->sglist_len > 0) {
1923 if (!schp->dio_in_use) {
1924 int k;
1925
1926 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1927 SCSI_LOG_TIMEOUT(5,
1928 sg_printk(KERN_INFO, sfp->parentdp,
1929 "sg_remove_scat: k=%d, pg=0x%p\n",
1930 k, schp->pages[k]));
1931 __free_pages(schp->pages[k], schp->page_order);
1932 }
1933
1934 kfree(schp->pages);
1935 }
1936 }
1937 memset(schp, 0, sizeof (*schp));
1938 }
1939
1940 static int
1941 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1942 {
1943 Sg_scatter_hold *schp = &srp->data;
1944 int k, num;
1945
1946 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1947 "sg_read_oxfer: num_read_xfer=%d\n",
1948 num_read_xfer));
1949 if ((!outp) || (num_read_xfer <= 0))
1950 return 0;
1951
1952 num = 1 << (PAGE_SHIFT + schp->page_order);
1953 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1954 if (num > num_read_xfer) {
1955 if (__copy_to_user(outp, page_address(schp->pages[k]),
1956 num_read_xfer))
1957 return -EFAULT;
1958 break;
1959 } else {
1960 if (__copy_to_user(outp, page_address(schp->pages[k]),
1961 num))
1962 return -EFAULT;
1963 num_read_xfer -= num;
1964 if (num_read_xfer <= 0)
1965 break;
1966 outp += num;
1967 }
1968 }
1969
1970 return 0;
1971 }
1972
1973 static void
1974 sg_build_reserve(Sg_fd * sfp, int req_size)
1975 {
1976 Sg_scatter_hold *schp = &sfp->reserve;
1977
1978 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1979 "sg_build_reserve: req_size=%d\n", req_size));
1980 do {
1981 if (req_size < PAGE_SIZE)
1982 req_size = PAGE_SIZE;
1983 if (0 == sg_build_indirect(schp, sfp, req_size))
1984 return;
1985 else
1986 sg_remove_scat(sfp, schp);
1987 req_size >>= 1; /* divide by 2 */
1988 } while (req_size > (PAGE_SIZE / 2));
1989 }
1990
1991 static void
1992 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1993 {
1994 Sg_scatter_hold *req_schp = &srp->data;
1995 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1996 int k, num, rem;
1997
1998 srp->res_used = 1;
1999 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
2000 "sg_link_reserve: size=%d\n", size));
2001 rem = size;
2002
2003 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
2004 for (k = 0; k < rsv_schp->k_use_sg; k++) {
2005 if (rem <= num) {
2006 req_schp->k_use_sg = k + 1;
2007 req_schp->sglist_len = rsv_schp->sglist_len;
2008 req_schp->pages = rsv_schp->pages;
2009
2010 req_schp->bufflen = size;
2011 req_schp->page_order = rsv_schp->page_order;
2012 break;
2013 } else
2014 rem -= num;
2015 }
2016
2017 if (k >= rsv_schp->k_use_sg)
2018 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2019 "sg_link_reserve: BAD size\n"));
2020 }
2021
2022 static void
2023 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2024 {
2025 Sg_scatter_hold *req_schp = &srp->data;
2026
2027 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2028 "sg_unlink_reserve: req->k_use_sg=%d\n",
2029 (int) req_schp->k_use_sg));
2030 req_schp->k_use_sg = 0;
2031 req_schp->bufflen = 0;
2032 req_schp->pages = NULL;
2033 req_schp->page_order = 0;
2034 req_schp->sglist_len = 0;
2035 srp->res_used = 0;
2036 /* Called without mutex lock to avoid deadlock */
2037 sfp->res_in_use = 0;
2038 }
2039
2040 static Sg_request *
2041 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2042 {
2043 Sg_request *resp;
2044 unsigned long iflags;
2045
2046 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2047 list_for_each_entry(resp, &sfp->rq_list, entry) {
2048 /* look for requests that are ready + not SG_IO owned */
2049 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2050 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2051 resp->done = 2; /* guard against other readers */
2052 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2053 return resp;
2054 }
2055 }
2056 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2057 return NULL;
2058 }
2059
2060 /* always adds to end of list */
2061 static Sg_request *
2062 sg_add_request(Sg_fd * sfp)
2063 {
2064 int k;
2065 unsigned long iflags;
2066 Sg_request *rp = sfp->req_arr;
2067
2068 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2069 if (!list_empty(&sfp->rq_list)) {
2070 if (!sfp->cmd_q)
2071 goto out_unlock;
2072
2073 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2074 if (!rp->parentfp)
2075 break;
2076 }
2077 if (k >= SG_MAX_QUEUE)
2078 goto out_unlock;
2079 }
2080 memset(rp, 0, sizeof (Sg_request));
2081 rp->parentfp = sfp;
2082 rp->header.duration = jiffies_to_msecs(jiffies);
2083 list_add_tail(&rp->entry, &sfp->rq_list);
2084 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2085 return rp;
2086 out_unlock:
2087 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2088 return NULL;
2089 }
2090
2091 /* Return of 1 for found; 0 for not found */
2092 static int
2093 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2094 {
2095 unsigned long iflags;
2096 int res = 0;
2097
2098 if (!sfp || !srp || list_empty(&sfp->rq_list))
2099 return res;
2100 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2101 if (!list_empty(&srp->entry)) {
2102 list_del(&srp->entry);
2103 srp->parentfp = NULL;
2104 res = 1;
2105 }
2106 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2107 return res;
2108 }
2109
2110 static Sg_fd *
2111 sg_add_sfp(Sg_device * sdp)
2112 {
2113 Sg_fd *sfp;
2114 unsigned long iflags;
2115 int bufflen;
2116
2117 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2118 if (!sfp)
2119 return ERR_PTR(-ENOMEM);
2120
2121 init_waitqueue_head(&sfp->read_wait);
2122 rwlock_init(&sfp->rq_list_lock);
2123 INIT_LIST_HEAD(&sfp->rq_list);
2124 kref_init(&sfp->f_ref);
2125 mutex_init(&sfp->f_mutex);
2126 sfp->timeout = SG_DEFAULT_TIMEOUT;
2127 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2128 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2129 sfp->cmd_q = SG_DEF_COMMAND_Q;
2130 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2131 sfp->parentdp = sdp;
2132 write_lock_irqsave(&sdp->sfd_lock, iflags);
2133 if (atomic_read(&sdp->detaching)) {
2134 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2135 return ERR_PTR(-ENODEV);
2136 }
2137 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2138 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2139 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2140 "sg_add_sfp: sfp=0x%p\n", sfp));
2141 if (unlikely(sg_big_buff != def_reserved_size))
2142 sg_big_buff = def_reserved_size;
2143
2144 bufflen = min_t(int, sg_big_buff,
2145 max_sectors_bytes(sdp->device->request_queue));
2146 sg_build_reserve(sfp, bufflen);
2147 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2148 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2149 sfp->reserve.bufflen,
2150 sfp->reserve.k_use_sg));
2151
2152 kref_get(&sdp->d_ref);
2153 __module_get(THIS_MODULE);
2154 return sfp;
2155 }
2156
2157 static void
2158 sg_remove_sfp_usercontext(struct work_struct *work)
2159 {
2160 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2161 struct sg_device *sdp = sfp->parentdp;
2162 Sg_request *srp;
2163 unsigned long iflags;
2164
2165 /* Cleanup any responses which were never read(). */
2166 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2167 while (!list_empty(&sfp->rq_list)) {
2168 srp = list_first_entry(&sfp->rq_list, Sg_request, entry);
2169 sg_finish_rem_req(srp);
2170 list_del(&srp->entry);
2171 srp->parentfp = NULL;
2172 }
2173 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2174
2175 if (sfp->reserve.bufflen > 0) {
2176 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2177 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2178 (int) sfp->reserve.bufflen,
2179 (int) sfp->reserve.k_use_sg));
2180 sg_remove_scat(sfp, &sfp->reserve);
2181 }
2182
2183 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2184 "sg_remove_sfp: sfp=0x%p\n", sfp));
2185 kfree(sfp);
2186
2187 scsi_device_put(sdp->device);
2188 kref_put(&sdp->d_ref, sg_device_destroy);
2189 module_put(THIS_MODULE);
2190 }
2191
2192 static void
2193 sg_remove_sfp(struct kref *kref)
2194 {
2195 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2196 struct sg_device *sdp = sfp->parentdp;
2197 unsigned long iflags;
2198
2199 write_lock_irqsave(&sdp->sfd_lock, iflags);
2200 list_del(&sfp->sfd_siblings);
2201 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2202
2203 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2204 schedule_work(&sfp->ew.work);
2205 }
2206
2207 #ifdef CONFIG_SCSI_PROC_FS
2208 static int
2209 sg_idr_max_id(int id, void *p, void *data)
2210 {
2211 int *k = data;
2212
2213 if (*k < id)
2214 *k = id;
2215
2216 return 0;
2217 }
2218
2219 static int
2220 sg_last_dev(void)
2221 {
2222 int k = -1;
2223 unsigned long iflags;
2224
2225 read_lock_irqsave(&sg_index_lock, iflags);
2226 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2227 read_unlock_irqrestore(&sg_index_lock, iflags);
2228 return k + 1; /* origin 1 */
2229 }
2230 #endif
2231
2232 /* must be called with sg_index_lock held */
2233 static Sg_device *sg_lookup_dev(int dev)
2234 {
2235 return idr_find(&sg_index_idr, dev);
2236 }
2237
2238 static Sg_device *
2239 sg_get_dev(int dev)
2240 {
2241 struct sg_device *sdp;
2242 unsigned long flags;
2243
2244 read_lock_irqsave(&sg_index_lock, flags);
2245 sdp = sg_lookup_dev(dev);
2246 if (!sdp)
2247 sdp = ERR_PTR(-ENXIO);
2248 else if (atomic_read(&sdp->detaching)) {
2249 /* If sdp->detaching, then the refcount may already be 0, in
2250 * which case it would be a bug to do kref_get().
2251 */
2252 sdp = ERR_PTR(-ENODEV);
2253 } else
2254 kref_get(&sdp->d_ref);
2255 read_unlock_irqrestore(&sg_index_lock, flags);
2256
2257 return sdp;
2258 }
2259
2260 #ifdef CONFIG_SCSI_PROC_FS
2261
2262 static struct proc_dir_entry *sg_proc_sgp = NULL;
2263
2264 static char sg_proc_sg_dirname[] = "scsi/sg";
2265
2266 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2267
2268 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2269 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2270 size_t count, loff_t *off);
2271 static const struct file_operations adio_fops = {
2272 .owner = THIS_MODULE,
2273 .open = sg_proc_single_open_adio,
2274 .read = seq_read,
2275 .llseek = seq_lseek,
2276 .write = sg_proc_write_adio,
2277 .release = single_release,
2278 };
2279
2280 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2281 static ssize_t sg_proc_write_dressz(struct file *filp,
2282 const char __user *buffer, size_t count, loff_t *off);
2283 static const struct file_operations dressz_fops = {
2284 .owner = THIS_MODULE,
2285 .open = sg_proc_single_open_dressz,
2286 .read = seq_read,
2287 .llseek = seq_lseek,
2288 .write = sg_proc_write_dressz,
2289 .release = single_release,
2290 };
2291
2292 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2293 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2294 static const struct file_operations version_fops = {
2295 .owner = THIS_MODULE,
2296 .open = sg_proc_single_open_version,
2297 .read = seq_read,
2298 .llseek = seq_lseek,
2299 .release = single_release,
2300 };
2301
2302 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2303 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2304 static const struct file_operations devhdr_fops = {
2305 .owner = THIS_MODULE,
2306 .open = sg_proc_single_open_devhdr,
2307 .read = seq_read,
2308 .llseek = seq_lseek,
2309 .release = single_release,
2310 };
2311
2312 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2313 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2314 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2315 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2316 static void dev_seq_stop(struct seq_file *s, void *v);
2317 static const struct file_operations dev_fops = {
2318 .owner = THIS_MODULE,
2319 .open = sg_proc_open_dev,
2320 .read = seq_read,
2321 .llseek = seq_lseek,
2322 .release = seq_release,
2323 };
2324 static const struct seq_operations dev_seq_ops = {
2325 .start = dev_seq_start,
2326 .next = dev_seq_next,
2327 .stop = dev_seq_stop,
2328 .show = sg_proc_seq_show_dev,
2329 };
2330
2331 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2332 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2333 static const struct file_operations devstrs_fops = {
2334 .owner = THIS_MODULE,
2335 .open = sg_proc_open_devstrs,
2336 .read = seq_read,
2337 .llseek = seq_lseek,
2338 .release = seq_release,
2339 };
2340 static const struct seq_operations devstrs_seq_ops = {
2341 .start = dev_seq_start,
2342 .next = dev_seq_next,
2343 .stop = dev_seq_stop,
2344 .show = sg_proc_seq_show_devstrs,
2345 };
2346
2347 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2348 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2349 static const struct file_operations debug_fops = {
2350 .owner = THIS_MODULE,
2351 .open = sg_proc_open_debug,
2352 .read = seq_read,
2353 .llseek = seq_lseek,
2354 .release = seq_release,
2355 };
2356 static const struct seq_operations debug_seq_ops = {
2357 .start = dev_seq_start,
2358 .next = dev_seq_next,
2359 .stop = dev_seq_stop,
2360 .show = sg_proc_seq_show_debug,
2361 };
2362
2363
2364 struct sg_proc_leaf {
2365 const char * name;
2366 const struct file_operations * fops;
2367 };
2368
2369 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2370 {"allow_dio", &adio_fops},
2371 {"debug", &debug_fops},
2372 {"def_reserved_size", &dressz_fops},
2373 {"device_hdr", &devhdr_fops},
2374 {"devices", &dev_fops},
2375 {"device_strs", &devstrs_fops},
2376 {"version", &version_fops}
2377 };
2378
2379 static int
2380 sg_proc_init(void)
2381 {
2382 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2383 int k;
2384
2385 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2386 if (!sg_proc_sgp)
2387 return 1;
2388 for (k = 0; k < num_leaves; ++k) {
2389 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2390 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2391 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2392 }
2393 return 0;
2394 }
2395
2396 static void
2397 sg_proc_cleanup(void)
2398 {
2399 int k;
2400 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2401
2402 if (!sg_proc_sgp)
2403 return;
2404 for (k = 0; k < num_leaves; ++k)
2405 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2406 remove_proc_entry(sg_proc_sg_dirname, NULL);
2407 }
2408
2409
2410 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2411 {
2412 seq_printf(s, "%d\n", *((int *)s->private));
2413 return 0;
2414 }
2415
2416 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2417 {
2418 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2419 }
2420
2421 static ssize_t
2422 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2423 size_t count, loff_t *off)
2424 {
2425 int err;
2426 unsigned long num;
2427
2428 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2429 return -EACCES;
2430 err = kstrtoul_from_user(buffer, count, 0, &num);
2431 if (err)
2432 return err;
2433 sg_allow_dio = num ? 1 : 0;
2434 return count;
2435 }
2436
2437 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2438 {
2439 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2440 }
2441
2442 static ssize_t
2443 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2444 size_t count, loff_t *off)
2445 {
2446 int err;
2447 unsigned long k = ULONG_MAX;
2448
2449 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2450 return -EACCES;
2451
2452 err = kstrtoul_from_user(buffer, count, 0, &k);
2453 if (err)
2454 return err;
2455 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2456 sg_big_buff = k;
2457 return count;
2458 }
2459 return -ERANGE;
2460 }
2461
2462 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2463 {
2464 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2465 sg_version_date);
2466 return 0;
2467 }
2468
2469 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2470 {
2471 return single_open(file, sg_proc_seq_show_version, NULL);
2472 }
2473
2474 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2475 {
2476 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
2477 return 0;
2478 }
2479
2480 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2481 {
2482 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2483 }
2484
2485 struct sg_proc_deviter {
2486 loff_t index;
2487 size_t max;
2488 };
2489
2490 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2491 {
2492 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2493
2494 s->private = it;
2495 if (! it)
2496 return NULL;
2497
2498 it->index = *pos;
2499 it->max = sg_last_dev();
2500 if (it->index >= it->max)
2501 return NULL;
2502 return it;
2503 }
2504
2505 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2506 {
2507 struct sg_proc_deviter * it = s->private;
2508
2509 *pos = ++it->index;
2510 return (it->index < it->max) ? it : NULL;
2511 }
2512
2513 static void dev_seq_stop(struct seq_file *s, void *v)
2514 {
2515 kfree(s->private);
2516 }
2517
2518 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2519 {
2520 return seq_open(file, &dev_seq_ops);
2521 }
2522
2523 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2524 {
2525 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2526 Sg_device *sdp;
2527 struct scsi_device *scsidp;
2528 unsigned long iflags;
2529
2530 read_lock_irqsave(&sg_index_lock, iflags);
2531 sdp = it ? sg_lookup_dev(it->index) : NULL;
2532 if ((NULL == sdp) || (NULL == sdp->device) ||
2533 (atomic_read(&sdp->detaching)))
2534 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2535 else {
2536 scsidp = sdp->device;
2537 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
2538 scsidp->host->host_no, scsidp->channel,
2539 scsidp->id, scsidp->lun, (int) scsidp->type,
2540 1,
2541 (int) scsidp->queue_depth,
2542 (int) atomic_read(&scsidp->device_busy),
2543 (int) scsi_device_online(scsidp));
2544 }
2545 read_unlock_irqrestore(&sg_index_lock, iflags);
2546 return 0;
2547 }
2548
2549 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2550 {
2551 return seq_open(file, &devstrs_seq_ops);
2552 }
2553
2554 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2555 {
2556 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2557 Sg_device *sdp;
2558 struct scsi_device *scsidp;
2559 unsigned long iflags;
2560
2561 read_lock_irqsave(&sg_index_lock, iflags);
2562 sdp = it ? sg_lookup_dev(it->index) : NULL;
2563 scsidp = sdp ? sdp->device : NULL;
2564 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
2565 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2566 scsidp->vendor, scsidp->model, scsidp->rev);
2567 else
2568 seq_puts(s, "<no active device>\n");
2569 read_unlock_irqrestore(&sg_index_lock, iflags);
2570 return 0;
2571 }
2572
2573 /* must be called while holding sg_index_lock */
2574 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2575 {
2576 int k, new_interface, blen, usg;
2577 Sg_request *srp;
2578 Sg_fd *fp;
2579 const sg_io_hdr_t *hp;
2580 const char * cp;
2581 unsigned int ms;
2582
2583 k = 0;
2584 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2585 k++;
2586 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2587 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2588 "(res)sgat=%d low_dma=%d\n", k,
2589 jiffies_to_msecs(fp->timeout),
2590 fp->reserve.bufflen,
2591 (int) fp->reserve.k_use_sg,
2592 (int) sdp->device->host->unchecked_isa_dma);
2593 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2594 (int) fp->cmd_q, (int) fp->force_packid,
2595 (int) fp->keep_orphan);
2596 list_for_each_entry(srp, &fp->rq_list, entry) {
2597 hp = &srp->header;
2598 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2599 if (srp->res_used) {
2600 if (new_interface &&
2601 (SG_FLAG_MMAP_IO & hp->flags))
2602 cp = " mmap>> ";
2603 else
2604 cp = " rb>> ";
2605 } else {
2606 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2607 cp = " dio>> ";
2608 else
2609 cp = " ";
2610 }
2611 seq_puts(s, cp);
2612 blen = srp->data.bufflen;
2613 usg = srp->data.k_use_sg;
2614 seq_puts(s, srp->done ?
2615 ((1 == srp->done) ? "rcv:" : "fin:")
2616 : "act:");
2617 seq_printf(s, " id=%d blen=%d",
2618 srp->header.pack_id, blen);
2619 if (srp->done)
2620 seq_printf(s, " dur=%d", hp->duration);
2621 else {
2622 ms = jiffies_to_msecs(jiffies);
2623 seq_printf(s, " t_o/elap=%d/%d",
2624 (new_interface ? hp->timeout :
2625 jiffies_to_msecs(fp->timeout)),
2626 (ms > hp->duration ? ms - hp->duration : 0));
2627 }
2628 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2629 (int) srp->data.cmd_opcode);
2630 }
2631 if (list_empty(&fp->rq_list))
2632 seq_puts(s, " No requests active\n");
2633 read_unlock(&fp->rq_list_lock);
2634 }
2635 }
2636
2637 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2638 {
2639 return seq_open(file, &debug_seq_ops);
2640 }
2641
2642 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2643 {
2644 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2645 Sg_device *sdp;
2646 unsigned long iflags;
2647
2648 if (it && (0 == it->index))
2649 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2650 (int)it->max, sg_big_buff);
2651
2652 read_lock_irqsave(&sg_index_lock, iflags);
2653 sdp = it ? sg_lookup_dev(it->index) : NULL;
2654 if (NULL == sdp)
2655 goto skip;
2656 read_lock(&sdp->sfd_lock);
2657 if (!list_empty(&sdp->sfds)) {
2658 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2659 if (atomic_read(&sdp->detaching))
2660 seq_puts(s, "detaching pending close ");
2661 else if (sdp->device) {
2662 struct scsi_device *scsidp = sdp->device;
2663
2664 seq_printf(s, "%d:%d:%d:%llu em=%d",
2665 scsidp->host->host_no,
2666 scsidp->channel, scsidp->id,
2667 scsidp->lun,
2668 scsidp->host->hostt->emulated);
2669 }
2670 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2671 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
2672 sg_proc_debug_helper(s, sdp);
2673 }
2674 read_unlock(&sdp->sfd_lock);
2675 skip:
2676 read_unlock_irqrestore(&sg_index_lock, iflags);
2677 return 0;
2678 }
2679
2680 #endif /* CONFIG_SCSI_PROC_FS */
2681
2682 module_init(init_sg);
2683 module_exit(exit_sg);
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