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hwrng: core - Don't use a stack buffer in add_early_randomness()
[linux/fpc-iii.git] / drivers / scsi / sg.c
blob070332eb41f33de2c765bedc724f50f404af62a9
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 sg_request *nextrp; /* NULL -> tail request (slist) */
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 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
146 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
147 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
148 unsigned save_scat_len; /* original length of trunc. scat. element */
149 Sg_request *headrp; /* head of request slist, NULL->empty */
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 low_dma; /* as in parent but possibly overridden to 1 */
153 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
154 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
155 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */
156 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
157 char mmap_called; /* 0 -> mmap() never called on this fd */
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 int sg_res_in_use(Sg_fd * sfp);
202 static Sg_device *sg_get_dev(int dev);
203 static void sg_device_destroy(struct kref *kref);
204
205 #define SZ_SG_HEADER sizeof(struct sg_header)
206 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
207 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
208 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
209
210 #define sg_printk(prefix, sdp, fmt, a...) \
211 sdev_prefix_printk(prefix, (sdp)->device, \
212 (sdp)->disk->disk_name, fmt, ##a)
213
214 static int sg_allow_access(struct file *filp, unsigned char *cmd)
215 {
216 struct sg_fd *sfp = filp->private_data;
217
218 if (sfp->parentdp->device->type == TYPE_SCANNER)
219 return 0;
220
221 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
222 }
223
224 static int
225 open_wait(Sg_device *sdp, int flags)
226 {
227 int retval = 0;
228
229 if (flags & O_EXCL) {
230 while (sdp->open_cnt > 0) {
231 mutex_unlock(&sdp->open_rel_lock);
232 retval = wait_event_interruptible(sdp->open_wait,
233 (atomic_read(&sdp->detaching) ||
234 !sdp->open_cnt));
235 mutex_lock(&sdp->open_rel_lock);
236
237 if (retval) /* -ERESTARTSYS */
238 return retval;
239 if (atomic_read(&sdp->detaching))
240 return -ENODEV;
241 }
242 } else {
243 while (sdp->exclude) {
244 mutex_unlock(&sdp->open_rel_lock);
245 retval = wait_event_interruptible(sdp->open_wait,
246 (atomic_read(&sdp->detaching) ||
247 !sdp->exclude));
248 mutex_lock(&sdp->open_rel_lock);
249
250 if (retval) /* -ERESTARTSYS */
251 return retval;
252 if (atomic_read(&sdp->detaching))
253 return -ENODEV;
254 }
255 }
256
257 return retval;
258 }
259
260 /* Returns 0 on success, else a negated errno value */
261 static int
262 sg_open(struct inode *inode, struct file *filp)
263 {
264 int dev = iminor(inode);
265 int flags = filp->f_flags;
266 struct request_queue *q;
267 Sg_device *sdp;
268 Sg_fd *sfp;
269 int retval;
270
271 nonseekable_open(inode, filp);
272 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
273 return -EPERM; /* Can't lock it with read only access */
274 sdp = sg_get_dev(dev);
275 if (IS_ERR(sdp))
276 return PTR_ERR(sdp);
277
278 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
279 "sg_open: flags=0x%x\n", flags));
280
281 /* This driver's module count bumped by fops_get in <linux/fs.h> */
282 /* Prevent the device driver from vanishing while we sleep */
283 retval = scsi_device_get(sdp->device);
284 if (retval)
285 goto sg_put;
286
287 retval = scsi_autopm_get_device(sdp->device);
288 if (retval)
289 goto sdp_put;
290
291 /* scsi_block_when_processing_errors() may block so bypass
292 * check if O_NONBLOCK. Permits SCSI commands to be issued
293 * during error recovery. Tread carefully. */
294 if (!((flags & O_NONBLOCK) ||
295 scsi_block_when_processing_errors(sdp->device))) {
296 retval = -ENXIO;
297 /* we are in error recovery for this device */
298 goto error_out;
299 }
300
301 mutex_lock(&sdp->open_rel_lock);
302 if (flags & O_NONBLOCK) {
303 if (flags & O_EXCL) {
304 if (sdp->open_cnt > 0) {
305 retval = -EBUSY;
306 goto error_mutex_locked;
307 }
308 } else {
309 if (sdp->exclude) {
310 retval = -EBUSY;
311 goto error_mutex_locked;
312 }
313 }
314 } else {
315 retval = open_wait(sdp, flags);
316 if (retval) /* -ERESTARTSYS or -ENODEV */
317 goto error_mutex_locked;
318 }
319
320 /* N.B. at this point we are holding the open_rel_lock */
321 if (flags & O_EXCL)
322 sdp->exclude = true;
323
324 if (sdp->open_cnt < 1) { /* no existing opens */
325 sdp->sgdebug = 0;
326 q = sdp->device->request_queue;
327 sdp->sg_tablesize = queue_max_segments(q);
328 }
329 sfp = sg_add_sfp(sdp);
330 if (IS_ERR(sfp)) {
331 retval = PTR_ERR(sfp);
332 goto out_undo;
333 }
334
335 filp->private_data = sfp;
336 sdp->open_cnt++;
337 mutex_unlock(&sdp->open_rel_lock);
338
339 retval = 0;
340 sg_put:
341 kref_put(&sdp->d_ref, sg_device_destroy);
342 return retval;
343
344 out_undo:
345 if (flags & O_EXCL) {
346 sdp->exclude = false; /* undo if error */
347 wake_up_interruptible(&sdp->open_wait);
348 }
349 error_mutex_locked:
350 mutex_unlock(&sdp->open_rel_lock);
351 error_out:
352 scsi_autopm_put_device(sdp->device);
353 sdp_put:
354 scsi_device_put(sdp->device);
355 goto sg_put;
356 }
357
358 /* Release resources associated with a successful sg_open()
359 * Returns 0 on success, else a negated errno value */
360 static int
361 sg_release(struct inode *inode, struct file *filp)
362 {
363 Sg_device *sdp;
364 Sg_fd *sfp;
365
366 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
367 return -ENXIO;
368 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
369
370 mutex_lock(&sdp->open_rel_lock);
371 scsi_autopm_put_device(sdp->device);
372 kref_put(&sfp->f_ref, sg_remove_sfp);
373 sdp->open_cnt--;
374
375 /* possibly many open()s waiting on exlude clearing, start many;
376 * only open(O_EXCL)s wait on 0==open_cnt so only start one */
377 if (sdp->exclude) {
378 sdp->exclude = false;
379 wake_up_interruptible_all(&sdp->open_wait);
380 } else if (0 == sdp->open_cnt) {
381 wake_up_interruptible(&sdp->open_wait);
382 }
383 mutex_unlock(&sdp->open_rel_lock);
384 return 0;
385 }
386
387 static ssize_t
388 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
389 {
390 Sg_device *sdp;
391 Sg_fd *sfp;
392 Sg_request *srp;
393 int req_pack_id = -1;
394 sg_io_hdr_t *hp;
395 struct sg_header *old_hdr = NULL;
396 int retval = 0;
397
398 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
399 return -ENXIO;
400 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
401 "sg_read: count=%d\n", (int) count));
402
403 if (!access_ok(VERIFY_WRITE, buf, count))
404 return -EFAULT;
405 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
406 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
407 if (!old_hdr)
408 return -ENOMEM;
409 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
410 retval = -EFAULT;
411 goto free_old_hdr;
412 }
413 if (old_hdr->reply_len < 0) {
414 if (count >= SZ_SG_IO_HDR) {
415 sg_io_hdr_t *new_hdr;
416 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
417 if (!new_hdr) {
418 retval = -ENOMEM;
419 goto free_old_hdr;
420 }
421 retval =__copy_from_user
422 (new_hdr, buf, SZ_SG_IO_HDR);
423 req_pack_id = new_hdr->pack_id;
424 kfree(new_hdr);
425 if (retval) {
426 retval = -EFAULT;
427 goto free_old_hdr;
428 }
429 }
430 } else
431 req_pack_id = old_hdr->pack_id;
432 }
433 srp = sg_get_rq_mark(sfp, req_pack_id);
434 if (!srp) { /* now wait on packet to arrive */
435 if (atomic_read(&sdp->detaching)) {
436 retval = -ENODEV;
437 goto free_old_hdr;
438 }
439 if (filp->f_flags & O_NONBLOCK) {
440 retval = -EAGAIN;
441 goto free_old_hdr;
442 }
443 retval = wait_event_interruptible(sfp->read_wait,
444 (atomic_read(&sdp->detaching) ||
445 (srp = sg_get_rq_mark(sfp, req_pack_id))));
446 if (atomic_read(&sdp->detaching)) {
447 retval = -ENODEV;
448 goto free_old_hdr;
449 }
450 if (retval) {
451 /* -ERESTARTSYS as signal hit process */
452 goto free_old_hdr;
453 }
454 }
455 if (srp->header.interface_id != '\0') {
456 retval = sg_new_read(sfp, buf, count, srp);
457 goto free_old_hdr;
458 }
459
460 hp = &srp->header;
461 if (old_hdr == NULL) {
462 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
463 if (! old_hdr) {
464 retval = -ENOMEM;
465 goto free_old_hdr;
466 }
467 }
468 memset(old_hdr, 0, SZ_SG_HEADER);
469 old_hdr->reply_len = (int) hp->timeout;
470 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
471 old_hdr->pack_id = hp->pack_id;
472 old_hdr->twelve_byte =
473 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
474 old_hdr->target_status = hp->masked_status;
475 old_hdr->host_status = hp->host_status;
476 old_hdr->driver_status = hp->driver_status;
477 if ((CHECK_CONDITION & hp->masked_status) ||
478 (DRIVER_SENSE & hp->driver_status))
479 memcpy(old_hdr->sense_buffer, srp->sense_b,
480 sizeof (old_hdr->sense_buffer));
481 switch (hp->host_status) {
482 /* This setup of 'result' is for backward compatibility and is best
483 ignored by the user who should use target, host + driver status */
484 case DID_OK:
485 case DID_PASSTHROUGH:
486 case DID_SOFT_ERROR:
487 old_hdr->result = 0;
488 break;
489 case DID_NO_CONNECT:
490 case DID_BUS_BUSY:
491 case DID_TIME_OUT:
492 old_hdr->result = EBUSY;
493 break;
494 case DID_BAD_TARGET:
495 case DID_ABORT:
496 case DID_PARITY:
497 case DID_RESET:
498 case DID_BAD_INTR:
499 old_hdr->result = EIO;
500 break;
501 case DID_ERROR:
502 old_hdr->result = (srp->sense_b[0] == 0 &&
503 hp->masked_status == GOOD) ? 0 : EIO;
504 break;
505 default:
506 old_hdr->result = EIO;
507 break;
508 }
509
510 /* Now copy the result back to the user buffer. */
511 if (count >= SZ_SG_HEADER) {
512 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
513 retval = -EFAULT;
514 goto free_old_hdr;
515 }
516 buf += SZ_SG_HEADER;
517 if (count > old_hdr->reply_len)
518 count = old_hdr->reply_len;
519 if (count > SZ_SG_HEADER) {
520 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
521 retval = -EFAULT;
522 goto free_old_hdr;
523 }
524 }
525 } else
526 count = (old_hdr->result == 0) ? 0 : -EIO;
527 sg_finish_rem_req(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 return err ? : err2 ? : count;
569 }
570
571 static ssize_t
572 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
573 {
574 int mxsize, cmd_size, k;
575 int input_size, blocking;
576 unsigned char opcode;
577 Sg_device *sdp;
578 Sg_fd *sfp;
579 Sg_request *srp;
580 struct sg_header old_hdr;
581 sg_io_hdr_t *hp;
582 unsigned char cmnd[SG_MAX_CDB_SIZE];
583
584 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
585 return -ENXIO;
586 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
587 "sg_write: count=%d\n", (int) count));
588 if (atomic_read(&sdp->detaching))
589 return -ENODEV;
590 if (!((filp->f_flags & O_NONBLOCK) ||
591 scsi_block_when_processing_errors(sdp->device)))
592 return -ENXIO;
593
594 if (!access_ok(VERIFY_READ, buf, count))
595 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
596 if (count < SZ_SG_HEADER)
597 return -EIO;
598 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
599 return -EFAULT;
600 blocking = !(filp->f_flags & O_NONBLOCK);
601 if (old_hdr.reply_len < 0)
602 return sg_new_write(sfp, filp, buf, count,
603 blocking, 0, 0, NULL);
604 if (count < (SZ_SG_HEADER + 6))
605 return -EIO; /* The minimum scsi command length is 6 bytes. */
606
607 if (!(srp = sg_add_request(sfp))) {
608 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
609 "sg_write: queue full\n"));
610 return -EDOM;
611 }
612 buf += SZ_SG_HEADER;
613 __get_user(opcode, buf);
614 if (sfp->next_cmd_len > 0) {
615 cmd_size = sfp->next_cmd_len;
616 sfp->next_cmd_len = 0; /* reset so only this write() effected */
617 } else {
618 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
619 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
620 cmd_size = 12;
621 }
622 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
623 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
624 /* Determine buffer size. */
625 input_size = count - cmd_size;
626 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
627 mxsize -= SZ_SG_HEADER;
628 input_size -= SZ_SG_HEADER;
629 if (input_size < 0) {
630 sg_remove_request(sfp, srp);
631 return -EIO; /* User did not pass enough bytes for this command. */
632 }
633 hp = &srp->header;
634 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
635 hp->cmd_len = (unsigned char) cmd_size;
636 hp->iovec_count = 0;
637 hp->mx_sb_len = 0;
638 if (input_size > 0)
639 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
640 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
641 else
642 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
643 hp->dxfer_len = mxsize;
644 if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||
645 (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV))
646 hp->dxferp = (char __user *)buf + cmd_size;
647 else
648 hp->dxferp = NULL;
649 hp->sbp = NULL;
650 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
651 hp->flags = input_size; /* structure abuse ... */
652 hp->pack_id = old_hdr.pack_id;
653 hp->usr_ptr = NULL;
654 if (__copy_from_user(cmnd, buf, cmd_size))
655 return -EFAULT;
656 /*
657 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
658 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
659 * is a non-zero input_size, so emit a warning.
660 */
661 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
662 static char cmd[TASK_COMM_LEN];
663 if (strcmp(current->comm, cmd)) {
664 printk_ratelimited(KERN_WARNING
665 "sg_write: data in/out %d/%d bytes "
666 "for SCSI command 0x%x-- guessing "
667 "data in;\n program %s not setting "
668 "count and/or reply_len properly\n",
669 old_hdr.reply_len - (int)SZ_SG_HEADER,
670 input_size, (unsigned int) cmnd[0],
671 current->comm);
672 strcpy(cmd, current->comm);
673 }
674 }
675 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
676 return (k < 0) ? k : count;
677 }
678
679 static ssize_t
680 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
681 size_t count, int blocking, int read_only, int sg_io_owned,
682 Sg_request **o_srp)
683 {
684 int k;
685 Sg_request *srp;
686 sg_io_hdr_t *hp;
687 unsigned char cmnd[SG_MAX_CDB_SIZE];
688 int timeout;
689 unsigned long ul_timeout;
690
691 if (count < SZ_SG_IO_HDR)
692 return -EINVAL;
693 if (!access_ok(VERIFY_READ, buf, count))
694 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
695
696 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
697 if (!(srp = sg_add_request(sfp))) {
698 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
699 "sg_new_write: queue full\n"));
700 return -EDOM;
701 }
702 srp->sg_io_owned = sg_io_owned;
703 hp = &srp->header;
704 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
705 sg_remove_request(sfp, srp);
706 return -EFAULT;
707 }
708 if (hp->interface_id != 'S') {
709 sg_remove_request(sfp, srp);
710 return -ENOSYS;
711 }
712 if (hp->flags & SG_FLAG_MMAP_IO) {
713 if (hp->dxfer_len > sfp->reserve.bufflen) {
714 sg_remove_request(sfp, srp);
715 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
716 }
717 if (hp->flags & SG_FLAG_DIRECT_IO) {
718 sg_remove_request(sfp, srp);
719 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
720 }
721 if (sg_res_in_use(sfp)) {
722 sg_remove_request(sfp, srp);
723 return -EBUSY; /* reserve buffer already being used */
724 }
725 }
726 ul_timeout = msecs_to_jiffies(srp->header.timeout);
727 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
728 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
729 sg_remove_request(sfp, srp);
730 return -EMSGSIZE;
731 }
732 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
733 sg_remove_request(sfp, srp);
734 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
735 }
736 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
737 sg_remove_request(sfp, srp);
738 return -EFAULT;
739 }
740 if (read_only && sg_allow_access(file, cmnd)) {
741 sg_remove_request(sfp, srp);
742 return -EPERM;
743 }
744 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
745 if (k < 0)
746 return k;
747 if (o_srp)
748 *o_srp = srp;
749 return count;
750 }
751
752 static int
753 sg_common_write(Sg_fd * sfp, Sg_request * srp,
754 unsigned char *cmnd, int timeout, int blocking)
755 {
756 int k, at_head;
757 Sg_device *sdp = sfp->parentdp;
758 sg_io_hdr_t *hp = &srp->header;
759
760 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
761 hp->status = 0;
762 hp->masked_status = 0;
763 hp->msg_status = 0;
764 hp->info = 0;
765 hp->host_status = 0;
766 hp->driver_status = 0;
767 hp->resid = 0;
768 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
769 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
770 (int) cmnd[0], (int) hp->cmd_len));
771
772 k = sg_start_req(srp, cmnd);
773 if (k) {
774 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
775 "sg_common_write: start_req err=%d\n", k));
776 sg_finish_rem_req(srp);
777 return k; /* probably out of space --> ENOMEM */
778 }
779 if (atomic_read(&sdp->detaching)) {
780 if (srp->bio) {
781 if (srp->rq->cmd != srp->rq->__cmd)
782 kfree(srp->rq->cmd);
783
784 blk_end_request_all(srp->rq, -EIO);
785 srp->rq = NULL;
786 }
787
788 sg_finish_rem_req(srp);
789 return -ENODEV;
790 }
791
792 hp->duration = jiffies_to_msecs(jiffies);
793 if (hp->interface_id != '\0' && /* v3 (or later) interface */
794 (SG_FLAG_Q_AT_TAIL & hp->flags))
795 at_head = 0;
796 else
797 at_head = 1;
798
799 srp->rq->timeout = timeout;
800 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
801 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
802 srp->rq, at_head, sg_rq_end_io);
803 return 0;
804 }
805
806 static int srp_done(Sg_fd *sfp, Sg_request *srp)
807 {
808 unsigned long flags;
809 int ret;
810
811 read_lock_irqsave(&sfp->rq_list_lock, flags);
812 ret = srp->done;
813 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
814 return ret;
815 }
816
817 static int max_sectors_bytes(struct request_queue *q)
818 {
819 unsigned int max_sectors = queue_max_sectors(q);
820
821 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
822
823 return max_sectors << 9;
824 }
825
826 static long
827 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
828 {
829 void __user *p = (void __user *)arg;
830 int __user *ip = p;
831 int result, val, read_only;
832 Sg_device *sdp;
833 Sg_fd *sfp;
834 Sg_request *srp;
835 unsigned long iflags;
836
837 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
838 return -ENXIO;
839
840 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
841 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
842 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
843
844 switch (cmd_in) {
845 case SG_IO:
846 if (atomic_read(&sdp->detaching))
847 return -ENODEV;
848 if (!scsi_block_when_processing_errors(sdp->device))
849 return -ENXIO;
850 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
851 return -EFAULT;
852 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
853 1, read_only, 1, &srp);
854 if (result < 0)
855 return result;
856 result = wait_event_interruptible(sfp->read_wait,
857 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
858 if (atomic_read(&sdp->detaching))
859 return -ENODEV;
860 write_lock_irq(&sfp->rq_list_lock);
861 if (srp->done) {
862 srp->done = 2;
863 write_unlock_irq(&sfp->rq_list_lock);
864 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
865 return (result < 0) ? result : 0;
866 }
867 srp->orphan = 1;
868 write_unlock_irq(&sfp->rq_list_lock);
869 return result; /* -ERESTARTSYS because signal hit process */
870 case SG_SET_TIMEOUT:
871 result = get_user(val, ip);
872 if (result)
873 return result;
874 if (val < 0)
875 return -EIO;
876 if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ))
877 val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ),
878 INT_MAX);
879 sfp->timeout_user = val;
880 sfp->timeout = mult_frac(val, HZ, USER_HZ);
881
882 return 0;
883 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
884 /* strange ..., for backward compatibility */
885 return sfp->timeout_user;
886 case SG_SET_FORCE_LOW_DMA:
887 result = get_user(val, ip);
888 if (result)
889 return result;
890 if (val) {
891 sfp->low_dma = 1;
892 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
893 val = (int) sfp->reserve.bufflen;
894 sg_remove_scat(sfp, &sfp->reserve);
895 sg_build_reserve(sfp, val);
896 }
897 } else {
898 if (atomic_read(&sdp->detaching))
899 return -ENODEV;
900 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
901 }
902 return 0;
903 case SG_GET_LOW_DMA:
904 return put_user((int) sfp->low_dma, ip);
905 case SG_GET_SCSI_ID:
906 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
907 return -EFAULT;
908 else {
909 sg_scsi_id_t __user *sg_idp = p;
910
911 if (atomic_read(&sdp->detaching))
912 return -ENODEV;
913 __put_user((int) sdp->device->host->host_no,
914 &sg_idp->host_no);
915 __put_user((int) sdp->device->channel,
916 &sg_idp->channel);
917 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
918 __put_user((int) sdp->device->lun, &sg_idp->lun);
919 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
920 __put_user((short) sdp->device->host->cmd_per_lun,
921 &sg_idp->h_cmd_per_lun);
922 __put_user((short) sdp->device->queue_depth,
923 &sg_idp->d_queue_depth);
924 __put_user(0, &sg_idp->unused[0]);
925 __put_user(0, &sg_idp->unused[1]);
926 return 0;
927 }
928 case SG_SET_FORCE_PACK_ID:
929 result = get_user(val, ip);
930 if (result)
931 return result;
932 sfp->force_packid = val ? 1 : 0;
933 return 0;
934 case SG_GET_PACK_ID:
935 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
936 return -EFAULT;
937 read_lock_irqsave(&sfp->rq_list_lock, iflags);
938 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
939 if ((1 == srp->done) && (!srp->sg_io_owned)) {
940 read_unlock_irqrestore(&sfp->rq_list_lock,
941 iflags);
942 __put_user(srp->header.pack_id, ip);
943 return 0;
944 }
945 }
946 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
947 __put_user(-1, ip);
948 return 0;
949 case SG_GET_NUM_WAITING:
950 read_lock_irqsave(&sfp->rq_list_lock, iflags);
951 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
952 if ((1 == srp->done) && (!srp->sg_io_owned))
953 ++val;
954 }
955 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
956 return put_user(val, ip);
957 case SG_GET_SG_TABLESIZE:
958 return put_user(sdp->sg_tablesize, ip);
959 case SG_SET_RESERVED_SIZE:
960 result = get_user(val, ip);
961 if (result)
962 return result;
963 if (val < 0)
964 return -EINVAL;
965 val = min_t(int, val,
966 max_sectors_bytes(sdp->device->request_queue));
967 if (val != sfp->reserve.bufflen) {
968 if (sg_res_in_use(sfp) || sfp->mmap_called)
969 return -EBUSY;
970 sg_remove_scat(sfp, &sfp->reserve);
971 sg_build_reserve(sfp, val);
972 }
973 return 0;
974 case SG_GET_RESERVED_SIZE:
975 val = min_t(int, sfp->reserve.bufflen,
976 max_sectors_bytes(sdp->device->request_queue));
977 return put_user(val, ip);
978 case SG_SET_COMMAND_Q:
979 result = get_user(val, ip);
980 if (result)
981 return result;
982 sfp->cmd_q = val ? 1 : 0;
983 return 0;
984 case SG_GET_COMMAND_Q:
985 return put_user((int) sfp->cmd_q, ip);
986 case SG_SET_KEEP_ORPHAN:
987 result = get_user(val, ip);
988 if (result)
989 return result;
990 sfp->keep_orphan = val;
991 return 0;
992 case SG_GET_KEEP_ORPHAN:
993 return put_user((int) sfp->keep_orphan, ip);
994 case SG_NEXT_CMD_LEN:
995 result = get_user(val, ip);
996 if (result)
997 return result;
998 sfp->next_cmd_len = (val > 0) ? val : 0;
999 return 0;
1000 case SG_GET_VERSION_NUM:
1001 return put_user(sg_version_num, ip);
1002 case SG_GET_ACCESS_COUNT:
1003 /* faked - we don't have a real access count anymore */
1004 val = (sdp->device ? 1 : 0);
1005 return put_user(val, ip);
1006 case SG_GET_REQUEST_TABLE:
1007 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1008 return -EFAULT;
1009 else {
1010 sg_req_info_t *rinfo;
1011 unsigned int ms;
1012
1013 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1014 GFP_KERNEL);
1015 if (!rinfo)
1016 return -ENOMEM;
1017 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1018 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1019 ++val, srp = srp ? srp->nextrp : srp) {
1020 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1021 if (srp) {
1022 rinfo[val].req_state = srp->done + 1;
1023 rinfo[val].problem =
1024 srp->header.masked_status &
1025 srp->header.host_status &
1026 srp->header.driver_status;
1027 if (srp->done)
1028 rinfo[val].duration =
1029 srp->header.duration;
1030 else {
1031 ms = jiffies_to_msecs(jiffies);
1032 rinfo[val].duration =
1033 (ms > srp->header.duration) ?
1034 (ms - srp->header.duration) : 0;
1035 }
1036 rinfo[val].orphan = srp->orphan;
1037 rinfo[val].sg_io_owned =
1038 srp->sg_io_owned;
1039 rinfo[val].pack_id =
1040 srp->header.pack_id;
1041 rinfo[val].usr_ptr =
1042 srp->header.usr_ptr;
1043 }
1044 }
1045 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1046 result = __copy_to_user(p, rinfo,
1047 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1048 result = result ? -EFAULT : 0;
1049 kfree(rinfo);
1050 return result;
1051 }
1052 case SG_EMULATED_HOST:
1053 if (atomic_read(&sdp->detaching))
1054 return -ENODEV;
1055 return put_user(sdp->device->host->hostt->emulated, ip);
1056 case SCSI_IOCTL_SEND_COMMAND:
1057 if (atomic_read(&sdp->detaching))
1058 return -ENODEV;
1059 if (read_only) {
1060 unsigned char opcode = WRITE_6;
1061 Scsi_Ioctl_Command __user *siocp = p;
1062
1063 if (copy_from_user(&opcode, siocp->data, 1))
1064 return -EFAULT;
1065 if (sg_allow_access(filp, &opcode))
1066 return -EPERM;
1067 }
1068 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1069 case SG_SET_DEBUG:
1070 result = get_user(val, ip);
1071 if (result)
1072 return result;
1073 sdp->sgdebug = (char) val;
1074 return 0;
1075 case BLKSECTGET:
1076 return put_user(max_sectors_bytes(sdp->device->request_queue),
1077 ip);
1078 case BLKTRACESETUP:
1079 return blk_trace_setup(sdp->device->request_queue,
1080 sdp->disk->disk_name,
1081 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1082 NULL,
1083 (char *)arg);
1084 case BLKTRACESTART:
1085 return blk_trace_startstop(sdp->device->request_queue, 1);
1086 case BLKTRACESTOP:
1087 return blk_trace_startstop(sdp->device->request_queue, 0);
1088 case BLKTRACETEARDOWN:
1089 return blk_trace_remove(sdp->device->request_queue);
1090 case SCSI_IOCTL_GET_IDLUN:
1091 case SCSI_IOCTL_GET_BUS_NUMBER:
1092 case SCSI_IOCTL_PROBE_HOST:
1093 case SG_GET_TRANSFORM:
1094 case SG_SCSI_RESET:
1095 if (atomic_read(&sdp->detaching))
1096 return -ENODEV;
1097 break;
1098 default:
1099 if (read_only)
1100 return -EPERM; /* don't know so take safe approach */
1101 break;
1102 }
1103
1104 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1105 cmd_in, filp->f_flags & O_NDELAY);
1106 if (result)
1107 return result;
1108 return scsi_ioctl(sdp->device, cmd_in, p);
1109 }
1110
1111 #ifdef CONFIG_COMPAT
1112 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1113 {
1114 Sg_device *sdp;
1115 Sg_fd *sfp;
1116 struct scsi_device *sdev;
1117
1118 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1119 return -ENXIO;
1120
1121 sdev = sdp->device;
1122 if (sdev->host->hostt->compat_ioctl) {
1123 int ret;
1124
1125 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1126
1127 return ret;
1128 }
1129
1130 return -ENOIOCTLCMD;
1131 }
1132 #endif
1133
1134 static unsigned int
1135 sg_poll(struct file *filp, poll_table * wait)
1136 {
1137 unsigned int res = 0;
1138 Sg_device *sdp;
1139 Sg_fd *sfp;
1140 Sg_request *srp;
1141 int count = 0;
1142 unsigned long iflags;
1143
1144 sfp = filp->private_data;
1145 if (!sfp)
1146 return POLLERR;
1147 sdp = sfp->parentdp;
1148 if (!sdp)
1149 return POLLERR;
1150 poll_wait(filp, &sfp->read_wait, wait);
1151 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1152 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1153 /* if any read waiting, flag it */
1154 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1155 res = POLLIN | POLLRDNORM;
1156 ++count;
1157 }
1158 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1159
1160 if (atomic_read(&sdp->detaching))
1161 res |= POLLHUP;
1162 else if (!sfp->cmd_q) {
1163 if (0 == count)
1164 res |= POLLOUT | POLLWRNORM;
1165 } else if (count < SG_MAX_QUEUE)
1166 res |= POLLOUT | POLLWRNORM;
1167 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1168 "sg_poll: res=0x%x\n", (int) res));
1169 return res;
1170 }
1171
1172 static int
1173 sg_fasync(int fd, struct file *filp, int mode)
1174 {
1175 Sg_device *sdp;
1176 Sg_fd *sfp;
1177
1178 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1179 return -ENXIO;
1180 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1181 "sg_fasync: mode=%d\n", mode));
1182
1183 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1184 }
1185
1186 static int
1187 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1188 {
1189 Sg_fd *sfp;
1190 unsigned long offset, len, sa;
1191 Sg_scatter_hold *rsv_schp;
1192 int k, length;
1193
1194 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1195 return VM_FAULT_SIGBUS;
1196 rsv_schp = &sfp->reserve;
1197 offset = vmf->pgoff << PAGE_SHIFT;
1198 if (offset >= rsv_schp->bufflen)
1199 return VM_FAULT_SIGBUS;
1200 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1201 "sg_vma_fault: offset=%lu, scatg=%d\n",
1202 offset, rsv_schp->k_use_sg));
1203 sa = vma->vm_start;
1204 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1205 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1206 len = vma->vm_end - sa;
1207 len = (len < length) ? len : length;
1208 if (offset < len) {
1209 struct page *page = nth_page(rsv_schp->pages[k],
1210 offset >> PAGE_SHIFT);
1211 get_page(page); /* increment page count */
1212 vmf->page = page;
1213 return 0; /* success */
1214 }
1215 sa += len;
1216 offset -= len;
1217 }
1218
1219 return VM_FAULT_SIGBUS;
1220 }
1221
1222 static const struct vm_operations_struct sg_mmap_vm_ops = {
1223 .fault = sg_vma_fault,
1224 };
1225
1226 static int
1227 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1228 {
1229 Sg_fd *sfp;
1230 unsigned long req_sz, len, sa;
1231 Sg_scatter_hold *rsv_schp;
1232 int k, length;
1233
1234 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1235 return -ENXIO;
1236 req_sz = vma->vm_end - vma->vm_start;
1237 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1238 "sg_mmap starting, vm_start=%p, len=%d\n",
1239 (void *) vma->vm_start, (int) req_sz));
1240 if (vma->vm_pgoff)
1241 return -EINVAL; /* want no offset */
1242 rsv_schp = &sfp->reserve;
1243 if (req_sz > rsv_schp->bufflen)
1244 return -ENOMEM; /* cannot map more than reserved buffer */
1245
1246 sa = vma->vm_start;
1247 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1248 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1249 len = vma->vm_end - sa;
1250 len = (len < length) ? len : length;
1251 sa += len;
1252 }
1253
1254 sfp->mmap_called = 1;
1255 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1256 vma->vm_private_data = sfp;
1257 vma->vm_ops = &sg_mmap_vm_ops;
1258 return 0;
1259 }
1260
1261 static void
1262 sg_rq_end_io_usercontext(struct work_struct *work)
1263 {
1264 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1265 struct sg_fd *sfp = srp->parentfp;
1266
1267 sg_finish_rem_req(srp);
1268 kref_put(&sfp->f_ref, sg_remove_sfp);
1269 }
1270
1271 /*
1272 * This function is a "bottom half" handler that is called by the mid
1273 * level when a command is completed (or has failed).
1274 */
1275 static void
1276 sg_rq_end_io(struct request *rq, int uptodate)
1277 {
1278 struct sg_request *srp = rq->end_io_data;
1279 Sg_device *sdp;
1280 Sg_fd *sfp;
1281 unsigned long iflags;
1282 unsigned int ms;
1283 char *sense;
1284 int result, resid, done = 1;
1285
1286 if (WARN_ON(srp->done != 0))
1287 return;
1288
1289 sfp = srp->parentfp;
1290 if (WARN_ON(sfp == NULL))
1291 return;
1292
1293 sdp = sfp->parentdp;
1294 if (unlikely(atomic_read(&sdp->detaching)))
1295 pr_info("%s: device detaching\n", __func__);
1296
1297 sense = rq->sense;
1298 result = rq->errors;
1299 resid = rq->resid_len;
1300
1301 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1302 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1303 srp->header.pack_id, result));
1304 srp->header.resid = resid;
1305 ms = jiffies_to_msecs(jiffies);
1306 srp->header.duration = (ms > srp->header.duration) ?
1307 (ms - srp->header.duration) : 0;
1308 if (0 != result) {
1309 struct scsi_sense_hdr sshdr;
1310
1311 srp->header.status = 0xff & result;
1312 srp->header.masked_status = status_byte(result);
1313 srp->header.msg_status = msg_byte(result);
1314 srp->header.host_status = host_byte(result);
1315 srp->header.driver_status = driver_byte(result);
1316 if ((sdp->sgdebug > 0) &&
1317 ((CHECK_CONDITION == srp->header.masked_status) ||
1318 (COMMAND_TERMINATED == srp->header.masked_status)))
1319 __scsi_print_sense(sdp->device, __func__, sense,
1320 SCSI_SENSE_BUFFERSIZE);
1321
1322 /* Following if statement is a patch supplied by Eric Youngdale */
1323 if (driver_byte(result) != 0
1324 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1325 && !scsi_sense_is_deferred(&sshdr)
1326 && sshdr.sense_key == UNIT_ATTENTION
1327 && sdp->device->removable) {
1328 /* Detected possible disc change. Set the bit - this */
1329 /* may be used if there are filesystems using this device */
1330 sdp->device->changed = 1;
1331 }
1332 }
1333 /* Rely on write phase to clean out srp status values, so no "else" */
1334
1335 /*
1336 * Free the request as soon as it is complete so that its resources
1337 * can be reused without waiting for userspace to read() the
1338 * result. But keep the associated bio (if any) around until
1339 * blk_rq_unmap_user() can be called from user context.
1340 */
1341 srp->rq = NULL;
1342 if (rq->cmd != rq->__cmd)
1343 kfree(rq->cmd);
1344 __blk_put_request(rq->q, rq);
1345
1346 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1347 if (unlikely(srp->orphan)) {
1348 if (sfp->keep_orphan)
1349 srp->sg_io_owned = 0;
1350 else
1351 done = 0;
1352 }
1353 srp->done = done;
1354 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1355
1356 if (likely(done)) {
1357 /* Now wake up any sg_read() that is waiting for this
1358 * packet.
1359 */
1360 wake_up_interruptible(&sfp->read_wait);
1361 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1362 kref_put(&sfp->f_ref, sg_remove_sfp);
1363 } else {
1364 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1365 schedule_work(&srp->ew.work);
1366 }
1367 }
1368
1369 static const struct file_operations sg_fops = {
1370 .owner = THIS_MODULE,
1371 .read = sg_read,
1372 .write = sg_write,
1373 .poll = sg_poll,
1374 .unlocked_ioctl = sg_ioctl,
1375 #ifdef CONFIG_COMPAT
1376 .compat_ioctl = sg_compat_ioctl,
1377 #endif
1378 .open = sg_open,
1379 .mmap = sg_mmap,
1380 .release = sg_release,
1381 .fasync = sg_fasync,
1382 .llseek = no_llseek,
1383 };
1384
1385 static struct class *sg_sysfs_class;
1386
1387 static int sg_sysfs_valid = 0;
1388
1389 static Sg_device *
1390 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1391 {
1392 struct request_queue *q = scsidp->request_queue;
1393 Sg_device *sdp;
1394 unsigned long iflags;
1395 int error;
1396 u32 k;
1397
1398 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1399 if (!sdp) {
1400 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1401 "failure\n", __func__);
1402 return ERR_PTR(-ENOMEM);
1403 }
1404
1405 idr_preload(GFP_KERNEL);
1406 write_lock_irqsave(&sg_index_lock, iflags);
1407
1408 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1409 if (error < 0) {
1410 if (error == -ENOSPC) {
1411 sdev_printk(KERN_WARNING, scsidp,
1412 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1413 scsidp->type, SG_MAX_DEVS - 1);
1414 error = -ENODEV;
1415 } else {
1416 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1417 "allocation Sg_device failure: %d\n",
1418 __func__, error);
1419 }
1420 goto out_unlock;
1421 }
1422 k = error;
1423
1424 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1425 "sg_alloc: dev=%d \n", k));
1426 sprintf(disk->disk_name, "sg%d", k);
1427 disk->first_minor = k;
1428 sdp->disk = disk;
1429 sdp->device = scsidp;
1430 mutex_init(&sdp->open_rel_lock);
1431 INIT_LIST_HEAD(&sdp->sfds);
1432 init_waitqueue_head(&sdp->open_wait);
1433 atomic_set(&sdp->detaching, 0);
1434 rwlock_init(&sdp->sfd_lock);
1435 sdp->sg_tablesize = queue_max_segments(q);
1436 sdp->index = k;
1437 kref_init(&sdp->d_ref);
1438 error = 0;
1439
1440 out_unlock:
1441 write_unlock_irqrestore(&sg_index_lock, iflags);
1442 idr_preload_end();
1443
1444 if (error) {
1445 kfree(sdp);
1446 return ERR_PTR(error);
1447 }
1448 return sdp;
1449 }
1450
1451 static int
1452 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1453 {
1454 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1455 struct gendisk *disk;
1456 Sg_device *sdp = NULL;
1457 struct cdev * cdev = NULL;
1458 int error;
1459 unsigned long iflags;
1460
1461 disk = alloc_disk(1);
1462 if (!disk) {
1463 pr_warn("%s: alloc_disk failed\n", __func__);
1464 return -ENOMEM;
1465 }
1466 disk->major = SCSI_GENERIC_MAJOR;
1467
1468 error = -ENOMEM;
1469 cdev = cdev_alloc();
1470 if (!cdev) {
1471 pr_warn("%s: cdev_alloc failed\n", __func__);
1472 goto out;
1473 }
1474 cdev->owner = THIS_MODULE;
1475 cdev->ops = &sg_fops;
1476
1477 sdp = sg_alloc(disk, scsidp);
1478 if (IS_ERR(sdp)) {
1479 pr_warn("%s: sg_alloc failed\n", __func__);
1480 error = PTR_ERR(sdp);
1481 goto out;
1482 }
1483
1484 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1485 if (error)
1486 goto cdev_add_err;
1487
1488 sdp->cdev = cdev;
1489 if (sg_sysfs_valid) {
1490 struct device *sg_class_member;
1491
1492 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1493 MKDEV(SCSI_GENERIC_MAJOR,
1494 sdp->index),
1495 sdp, "%s", disk->disk_name);
1496 if (IS_ERR(sg_class_member)) {
1497 pr_err("%s: device_create failed\n", __func__);
1498 error = PTR_ERR(sg_class_member);
1499 goto cdev_add_err;
1500 }
1501 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1502 &sg_class_member->kobj, "generic");
1503 if (error)
1504 pr_err("%s: unable to make symlink 'generic' back "
1505 "to sg%d\n", __func__, sdp->index);
1506 } else
1507 pr_warn("%s: sg_sys Invalid\n", __func__);
1508
1509 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1510 "type %d\n", sdp->index, scsidp->type);
1511
1512 dev_set_drvdata(cl_dev, sdp);
1513
1514 return 0;
1515
1516 cdev_add_err:
1517 write_lock_irqsave(&sg_index_lock, iflags);
1518 idr_remove(&sg_index_idr, sdp->index);
1519 write_unlock_irqrestore(&sg_index_lock, iflags);
1520 kfree(sdp);
1521
1522 out:
1523 put_disk(disk);
1524 if (cdev)
1525 cdev_del(cdev);
1526 return error;
1527 }
1528
1529 static void
1530 sg_device_destroy(struct kref *kref)
1531 {
1532 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1533 unsigned long flags;
1534
1535 /* CAUTION! Note that the device can still be found via idr_find()
1536 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1537 * any other cleanup.
1538 */
1539
1540 write_lock_irqsave(&sg_index_lock, flags);
1541 idr_remove(&sg_index_idr, sdp->index);
1542 write_unlock_irqrestore(&sg_index_lock, flags);
1543
1544 SCSI_LOG_TIMEOUT(3,
1545 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
1546
1547 put_disk(sdp->disk);
1548 kfree(sdp);
1549 }
1550
1551 static void
1552 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1553 {
1554 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1555 Sg_device *sdp = dev_get_drvdata(cl_dev);
1556 unsigned long iflags;
1557 Sg_fd *sfp;
1558 int val;
1559
1560 if (!sdp)
1561 return;
1562 /* want sdp->detaching non-zero as soon as possible */
1563 val = atomic_inc_return(&sdp->detaching);
1564 if (val > 1)
1565 return; /* only want to do following once per device */
1566
1567 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1568 "%s\n", __func__));
1569
1570 read_lock_irqsave(&sdp->sfd_lock, iflags);
1571 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1572 wake_up_interruptible_all(&sfp->read_wait);
1573 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1574 }
1575 wake_up_interruptible_all(&sdp->open_wait);
1576 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1577
1578 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1579 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1580 cdev_del(sdp->cdev);
1581 sdp->cdev = NULL;
1582
1583 kref_put(&sdp->d_ref, sg_device_destroy);
1584 }
1585
1586 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1587 module_param_named(def_reserved_size, def_reserved_size, int,
1588 S_IRUGO | S_IWUSR);
1589 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1590
1591 MODULE_AUTHOR("Douglas Gilbert");
1592 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1593 MODULE_LICENSE("GPL");
1594 MODULE_VERSION(SG_VERSION_STR);
1595 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1596
1597 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1598 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1599 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1600 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1601
1602 static int __init
1603 init_sg(void)
1604 {
1605 int rc;
1606
1607 if (scatter_elem_sz < PAGE_SIZE) {
1608 scatter_elem_sz = PAGE_SIZE;
1609 scatter_elem_sz_prev = scatter_elem_sz;
1610 }
1611 if (def_reserved_size >= 0)
1612 sg_big_buff = def_reserved_size;
1613 else
1614 def_reserved_size = sg_big_buff;
1615
1616 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1617 SG_MAX_DEVS, "sg");
1618 if (rc)
1619 return rc;
1620 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1621 if ( IS_ERR(sg_sysfs_class) ) {
1622 rc = PTR_ERR(sg_sysfs_class);
1623 goto err_out;
1624 }
1625 sg_sysfs_valid = 1;
1626 rc = scsi_register_interface(&sg_interface);
1627 if (0 == rc) {
1628 #ifdef CONFIG_SCSI_PROC_FS
1629 sg_proc_init();
1630 #endif /* CONFIG_SCSI_PROC_FS */
1631 return 0;
1632 }
1633 class_destroy(sg_sysfs_class);
1634 err_out:
1635 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1636 return rc;
1637 }
1638
1639 static void __exit
1640 exit_sg(void)
1641 {
1642 #ifdef CONFIG_SCSI_PROC_FS
1643 sg_proc_cleanup();
1644 #endif /* CONFIG_SCSI_PROC_FS */
1645 scsi_unregister_interface(&sg_interface);
1646 class_destroy(sg_sysfs_class);
1647 sg_sysfs_valid = 0;
1648 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1649 SG_MAX_DEVS);
1650 idr_destroy(&sg_index_idr);
1651 }
1652
1653 static int
1654 sg_start_req(Sg_request *srp, unsigned char *cmd)
1655 {
1656 int res;
1657 struct request *rq;
1658 Sg_fd *sfp = srp->parentfp;
1659 sg_io_hdr_t *hp = &srp->header;
1660 int dxfer_len = (int) hp->dxfer_len;
1661 int dxfer_dir = hp->dxfer_direction;
1662 unsigned int iov_count = hp->iovec_count;
1663 Sg_scatter_hold *req_schp = &srp->data;
1664 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1665 struct request_queue *q = sfp->parentdp->device->request_queue;
1666 struct rq_map_data *md, map_data;
1667 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1668 unsigned char *long_cmdp = NULL;
1669
1670 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1671 "sg_start_req: dxfer_len=%d\n",
1672 dxfer_len));
1673
1674 if (hp->cmd_len > BLK_MAX_CDB) {
1675 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1676 if (!long_cmdp)
1677 return -ENOMEM;
1678 }
1679
1680 /*
1681 * NOTE
1682 *
1683 * With scsi-mq enabled, there are a fixed number of preallocated
1684 * requests equal in number to shost->can_queue. If all of the
1685 * preallocated requests are already in use, then using GFP_ATOMIC with
1686 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1687 * will cause blk_get_request() to sleep until an active command
1688 * completes, freeing up a request. Neither option is ideal, but
1689 * GFP_KERNEL is the better choice to prevent userspace from getting an
1690 * unexpected EWOULDBLOCK.
1691 *
1692 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1693 * does not sleep except under memory pressure.
1694 */
1695 rq = blk_get_request(q, rw, GFP_KERNEL);
1696 if (IS_ERR(rq)) {
1697 kfree(long_cmdp);
1698 return PTR_ERR(rq);
1699 }
1700
1701 blk_rq_set_block_pc(rq);
1702
1703 if (hp->cmd_len > BLK_MAX_CDB)
1704 rq->cmd = long_cmdp;
1705 memcpy(rq->cmd, cmd, hp->cmd_len);
1706 rq->cmd_len = hp->cmd_len;
1707
1708 srp->rq = rq;
1709 rq->end_io_data = srp;
1710 rq->sense = srp->sense_b;
1711 rq->retries = SG_DEFAULT_RETRIES;
1712
1713 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1714 return 0;
1715
1716 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1717 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1718 !sfp->parentdp->device->host->unchecked_isa_dma &&
1719 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1720 md = NULL;
1721 else
1722 md = &map_data;
1723
1724 if (md) {
1725 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1726 sg_link_reserve(sfp, srp, dxfer_len);
1727 else {
1728 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1729 if (res)
1730 return res;
1731 }
1732
1733 md->pages = req_schp->pages;
1734 md->page_order = req_schp->page_order;
1735 md->nr_entries = req_schp->k_use_sg;
1736 md->offset = 0;
1737 md->null_mapped = hp->dxferp ? 0 : 1;
1738 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1739 md->from_user = 1;
1740 else
1741 md->from_user = 0;
1742 }
1743
1744 if (iov_count) {
1745 struct iovec *iov = NULL;
1746 struct iov_iter i;
1747
1748 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
1749 if (res < 0)
1750 return res;
1751
1752 iov_iter_truncate(&i, hp->dxfer_len);
1753
1754 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
1755 kfree(iov);
1756 } else
1757 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1758 hp->dxfer_len, GFP_ATOMIC);
1759
1760 if (!res) {
1761 srp->bio = rq->bio;
1762
1763 if (!md) {
1764 req_schp->dio_in_use = 1;
1765 hp->info |= SG_INFO_DIRECT_IO;
1766 }
1767 }
1768 return res;
1769 }
1770
1771 static int
1772 sg_finish_rem_req(Sg_request *srp)
1773 {
1774 int ret = 0;
1775
1776 Sg_fd *sfp = srp->parentfp;
1777 Sg_scatter_hold *req_schp = &srp->data;
1778
1779 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1780 "sg_finish_rem_req: res_used=%d\n",
1781 (int) srp->res_used));
1782 if (srp->bio)
1783 ret = blk_rq_unmap_user(srp->bio);
1784
1785 if (srp->rq) {
1786 if (srp->rq->cmd != srp->rq->__cmd)
1787 kfree(srp->rq->cmd);
1788 blk_put_request(srp->rq);
1789 }
1790
1791 if (srp->res_used)
1792 sg_unlink_reserve(sfp, srp);
1793 else
1794 sg_remove_scat(sfp, req_schp);
1795
1796 sg_remove_request(sfp, srp);
1797
1798 return ret;
1799 }
1800
1801 static int
1802 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1803 {
1804 int sg_bufflen = tablesize * sizeof(struct page *);
1805 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1806
1807 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1808 if (!schp->pages)
1809 return -ENOMEM;
1810 schp->sglist_len = sg_bufflen;
1811 return tablesize; /* number of scat_gath elements allocated */
1812 }
1813
1814 static int
1815 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1816 {
1817 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1818 int sg_tablesize = sfp->parentdp->sg_tablesize;
1819 int blk_size = buff_size, order;
1820 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1821
1822 if (blk_size < 0)
1823 return -EFAULT;
1824 if (0 == blk_size)
1825 ++blk_size; /* don't know why */
1826 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1827 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1828 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1829 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1830 buff_size, blk_size));
1831
1832 /* N.B. ret_sz carried into this block ... */
1833 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1834 if (mx_sc_elems < 0)
1835 return mx_sc_elems; /* most likely -ENOMEM */
1836
1837 num = scatter_elem_sz;
1838 if (unlikely(num != scatter_elem_sz_prev)) {
1839 if (num < PAGE_SIZE) {
1840 scatter_elem_sz = PAGE_SIZE;
1841 scatter_elem_sz_prev = PAGE_SIZE;
1842 } else
1843 scatter_elem_sz_prev = num;
1844 }
1845
1846 if (sfp->low_dma)
1847 gfp_mask |= GFP_DMA;
1848
1849 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1850 gfp_mask |= __GFP_ZERO;
1851
1852 order = get_order(num);
1853 retry:
1854 ret_sz = 1 << (PAGE_SHIFT + order);
1855
1856 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1857 k++, rem_sz -= ret_sz) {
1858
1859 num = (rem_sz > scatter_elem_sz_prev) ?
1860 scatter_elem_sz_prev : rem_sz;
1861
1862 schp->pages[k] = alloc_pages(gfp_mask, order);
1863 if (!schp->pages[k])
1864 goto out;
1865
1866 if (num == scatter_elem_sz_prev) {
1867 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1868 scatter_elem_sz = ret_sz;
1869 scatter_elem_sz_prev = ret_sz;
1870 }
1871 }
1872
1873 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1874 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1875 k, num, ret_sz));
1876 } /* end of for loop */
1877
1878 schp->page_order = order;
1879 schp->k_use_sg = k;
1880 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1881 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1882 k, rem_sz));
1883
1884 schp->bufflen = blk_size;
1885 if (rem_sz > 0) /* must have failed */
1886 return -ENOMEM;
1887 return 0;
1888 out:
1889 for (i = 0; i < k; i++)
1890 __free_pages(schp->pages[i], order);
1891
1892 if (--order >= 0)
1893 goto retry;
1894
1895 return -ENOMEM;
1896 }
1897
1898 static void
1899 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1900 {
1901 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1902 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1903 if (schp->pages && schp->sglist_len > 0) {
1904 if (!schp->dio_in_use) {
1905 int k;
1906
1907 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1908 SCSI_LOG_TIMEOUT(5,
1909 sg_printk(KERN_INFO, sfp->parentdp,
1910 "sg_remove_scat: k=%d, pg=0x%p\n",
1911 k, schp->pages[k]));
1912 __free_pages(schp->pages[k], schp->page_order);
1913 }
1914
1915 kfree(schp->pages);
1916 }
1917 }
1918 memset(schp, 0, sizeof (*schp));
1919 }
1920
1921 static int
1922 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1923 {
1924 Sg_scatter_hold *schp = &srp->data;
1925 int k, num;
1926
1927 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1928 "sg_read_oxfer: num_read_xfer=%d\n",
1929 num_read_xfer));
1930 if ((!outp) || (num_read_xfer <= 0))
1931 return 0;
1932
1933 num = 1 << (PAGE_SHIFT + schp->page_order);
1934 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1935 if (num > num_read_xfer) {
1936 if (__copy_to_user(outp, page_address(schp->pages[k]),
1937 num_read_xfer))
1938 return -EFAULT;
1939 break;
1940 } else {
1941 if (__copy_to_user(outp, page_address(schp->pages[k]),
1942 num))
1943 return -EFAULT;
1944 num_read_xfer -= num;
1945 if (num_read_xfer <= 0)
1946 break;
1947 outp += num;
1948 }
1949 }
1950
1951 return 0;
1952 }
1953
1954 static void
1955 sg_build_reserve(Sg_fd * sfp, int req_size)
1956 {
1957 Sg_scatter_hold *schp = &sfp->reserve;
1958
1959 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1960 "sg_build_reserve: req_size=%d\n", req_size));
1961 do {
1962 if (req_size < PAGE_SIZE)
1963 req_size = PAGE_SIZE;
1964 if (0 == sg_build_indirect(schp, sfp, req_size))
1965 return;
1966 else
1967 sg_remove_scat(sfp, schp);
1968 req_size >>= 1; /* divide by 2 */
1969 } while (req_size > (PAGE_SIZE / 2));
1970 }
1971
1972 static void
1973 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1974 {
1975 Sg_scatter_hold *req_schp = &srp->data;
1976 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1977 int k, num, rem;
1978
1979 srp->res_used = 1;
1980 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1981 "sg_link_reserve: size=%d\n", size));
1982 rem = size;
1983
1984 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1985 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1986 if (rem <= num) {
1987 req_schp->k_use_sg = k + 1;
1988 req_schp->sglist_len = rsv_schp->sglist_len;
1989 req_schp->pages = rsv_schp->pages;
1990
1991 req_schp->bufflen = size;
1992 req_schp->page_order = rsv_schp->page_order;
1993 break;
1994 } else
1995 rem -= num;
1996 }
1997
1998 if (k >= rsv_schp->k_use_sg)
1999 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2000 "sg_link_reserve: BAD size\n"));
2001 }
2002
2003 static void
2004 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2005 {
2006 Sg_scatter_hold *req_schp = &srp->data;
2007
2008 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2009 "sg_unlink_reserve: req->k_use_sg=%d\n",
2010 (int) req_schp->k_use_sg));
2011 req_schp->k_use_sg = 0;
2012 req_schp->bufflen = 0;
2013 req_schp->pages = NULL;
2014 req_schp->page_order = 0;
2015 req_schp->sglist_len = 0;
2016 sfp->save_scat_len = 0;
2017 srp->res_used = 0;
2018 }
2019
2020 static Sg_request *
2021 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2022 {
2023 Sg_request *resp;
2024 unsigned long iflags;
2025
2026 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2027 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2028 /* look for requests that are ready + not SG_IO owned */
2029 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2030 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2031 resp->done = 2; /* guard against other readers */
2032 break;
2033 }
2034 }
2035 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2036 return resp;
2037 }
2038
2039 /* always adds to end of list */
2040 static Sg_request *
2041 sg_add_request(Sg_fd * sfp)
2042 {
2043 int k;
2044 unsigned long iflags;
2045 Sg_request *resp;
2046 Sg_request *rp = sfp->req_arr;
2047
2048 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2049 resp = sfp->headrp;
2050 if (!resp) {
2051 memset(rp, 0, sizeof (Sg_request));
2052 rp->parentfp = sfp;
2053 resp = rp;
2054 sfp->headrp = resp;
2055 } else {
2056 if (0 == sfp->cmd_q)
2057 resp = NULL; /* command queuing disallowed */
2058 else {
2059 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2060 if (!rp->parentfp)
2061 break;
2062 }
2063 if (k < SG_MAX_QUEUE) {
2064 memset(rp, 0, sizeof (Sg_request));
2065 rp->parentfp = sfp;
2066 while (resp->nextrp)
2067 resp = resp->nextrp;
2068 resp->nextrp = rp;
2069 resp = rp;
2070 } else
2071 resp = NULL;
2072 }
2073 }
2074 if (resp) {
2075 resp->nextrp = NULL;
2076 resp->header.duration = jiffies_to_msecs(jiffies);
2077 }
2078 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2079 return resp;
2080 }
2081
2082 /* Return of 1 for found; 0 for not found */
2083 static int
2084 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2085 {
2086 Sg_request *prev_rp;
2087 Sg_request *rp;
2088 unsigned long iflags;
2089 int res = 0;
2090
2091 if ((!sfp) || (!srp) || (!sfp->headrp))
2092 return res;
2093 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2094 prev_rp = sfp->headrp;
2095 if (srp == prev_rp) {
2096 sfp->headrp = prev_rp->nextrp;
2097 prev_rp->parentfp = NULL;
2098 res = 1;
2099 } else {
2100 while ((rp = prev_rp->nextrp)) {
2101 if (srp == rp) {
2102 prev_rp->nextrp = rp->nextrp;
2103 rp->parentfp = NULL;
2104 res = 1;
2105 break;
2106 }
2107 prev_rp = rp;
2108 }
2109 }
2110 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2111 return res;
2112 }
2113
2114 static Sg_fd *
2115 sg_add_sfp(Sg_device * sdp)
2116 {
2117 Sg_fd *sfp;
2118 unsigned long iflags;
2119 int bufflen;
2120
2121 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2122 if (!sfp)
2123 return ERR_PTR(-ENOMEM);
2124
2125 init_waitqueue_head(&sfp->read_wait);
2126 rwlock_init(&sfp->rq_list_lock);
2127
2128 kref_init(&sfp->f_ref);
2129 sfp->timeout = SG_DEFAULT_TIMEOUT;
2130 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2131 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2132 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2133 sdp->device->host->unchecked_isa_dma : 1;
2134 sfp->cmd_q = SG_DEF_COMMAND_Q;
2135 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2136 sfp->parentdp = sdp;
2137 write_lock_irqsave(&sdp->sfd_lock, iflags);
2138 if (atomic_read(&sdp->detaching)) {
2139 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2140 return ERR_PTR(-ENODEV);
2141 }
2142 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2143 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2144 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2145 "sg_add_sfp: sfp=0x%p\n", sfp));
2146 if (unlikely(sg_big_buff != def_reserved_size))
2147 sg_big_buff = def_reserved_size;
2148
2149 bufflen = min_t(int, sg_big_buff,
2150 max_sectors_bytes(sdp->device->request_queue));
2151 sg_build_reserve(sfp, bufflen);
2152 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2153 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2154 sfp->reserve.bufflen,
2155 sfp->reserve.k_use_sg));
2156
2157 kref_get(&sdp->d_ref);
2158 __module_get(THIS_MODULE);
2159 return sfp;
2160 }
2161
2162 static void
2163 sg_remove_sfp_usercontext(struct work_struct *work)
2164 {
2165 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2166 struct sg_device *sdp = sfp->parentdp;
2167
2168 /* Cleanup any responses which were never read(). */
2169 while (sfp->headrp)
2170 sg_finish_rem_req(sfp->headrp);
2171
2172 if (sfp->reserve.bufflen > 0) {
2173 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2174 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2175 (int) sfp->reserve.bufflen,
2176 (int) sfp->reserve.k_use_sg));
2177 sg_remove_scat(sfp, &sfp->reserve);
2178 }
2179
2180 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2181 "sg_remove_sfp: sfp=0x%p\n", sfp));
2182 kfree(sfp);
2183
2184 scsi_device_put(sdp->device);
2185 kref_put(&sdp->d_ref, sg_device_destroy);
2186 module_put(THIS_MODULE);
2187 }
2188
2189 static void
2190 sg_remove_sfp(struct kref *kref)
2191 {
2192 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2193 struct sg_device *sdp = sfp->parentdp;
2194 unsigned long iflags;
2195
2196 write_lock_irqsave(&sdp->sfd_lock, iflags);
2197 list_del(&sfp->sfd_siblings);
2198 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2199
2200 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2201 schedule_work(&sfp->ew.work);
2202 }
2203
2204 static int
2205 sg_res_in_use(Sg_fd * sfp)
2206 {
2207 const Sg_request *srp;
2208 unsigned long iflags;
2209
2210 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2211 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2212 if (srp->res_used)
2213 break;
2214 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2215 return srp ? 1 : 0;
2216 }
2217
2218 #ifdef CONFIG_SCSI_PROC_FS
2219 static int
2220 sg_idr_max_id(int id, void *p, void *data)
2221 {
2222 int *k = data;
2223
2224 if (*k < id)
2225 *k = id;
2226
2227 return 0;
2228 }
2229
2230 static int
2231 sg_last_dev(void)
2232 {
2233 int k = -1;
2234 unsigned long iflags;
2235
2236 read_lock_irqsave(&sg_index_lock, iflags);
2237 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2238 read_unlock_irqrestore(&sg_index_lock, iflags);
2239 return k + 1; /* origin 1 */
2240 }
2241 #endif
2242
2243 /* must be called with sg_index_lock held */
2244 static Sg_device *sg_lookup_dev(int dev)
2245 {
2246 return idr_find(&sg_index_idr, dev);
2247 }
2248
2249 static Sg_device *
2250 sg_get_dev(int dev)
2251 {
2252 struct sg_device *sdp;
2253 unsigned long flags;
2254
2255 read_lock_irqsave(&sg_index_lock, flags);
2256 sdp = sg_lookup_dev(dev);
2257 if (!sdp)
2258 sdp = ERR_PTR(-ENXIO);
2259 else if (atomic_read(&sdp->detaching)) {
2260 /* If sdp->detaching, then the refcount may already be 0, in
2261 * which case it would be a bug to do kref_get().
2262 */
2263 sdp = ERR_PTR(-ENODEV);
2264 } else
2265 kref_get(&sdp->d_ref);
2266 read_unlock_irqrestore(&sg_index_lock, flags);
2267
2268 return sdp;
2269 }
2270
2271 #ifdef CONFIG_SCSI_PROC_FS
2272
2273 static struct proc_dir_entry *sg_proc_sgp = NULL;
2274
2275 static char sg_proc_sg_dirname[] = "scsi/sg";
2276
2277 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2278
2279 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2280 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2281 size_t count, loff_t *off);
2282 static const struct file_operations adio_fops = {
2283 .owner = THIS_MODULE,
2284 .open = sg_proc_single_open_adio,
2285 .read = seq_read,
2286 .llseek = seq_lseek,
2287 .write = sg_proc_write_adio,
2288 .release = single_release,
2289 };
2290
2291 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2292 static ssize_t sg_proc_write_dressz(struct file *filp,
2293 const char __user *buffer, size_t count, loff_t *off);
2294 static const struct file_operations dressz_fops = {
2295 .owner = THIS_MODULE,
2296 .open = sg_proc_single_open_dressz,
2297 .read = seq_read,
2298 .llseek = seq_lseek,
2299 .write = sg_proc_write_dressz,
2300 .release = single_release,
2301 };
2302
2303 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2304 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2305 static const struct file_operations version_fops = {
2306 .owner = THIS_MODULE,
2307 .open = sg_proc_single_open_version,
2308 .read = seq_read,
2309 .llseek = seq_lseek,
2310 .release = single_release,
2311 };
2312
2313 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2314 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2315 static const struct file_operations devhdr_fops = {
2316 .owner = THIS_MODULE,
2317 .open = sg_proc_single_open_devhdr,
2318 .read = seq_read,
2319 .llseek = seq_lseek,
2320 .release = single_release,
2321 };
2322
2323 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2324 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2325 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2326 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2327 static void dev_seq_stop(struct seq_file *s, void *v);
2328 static const struct file_operations dev_fops = {
2329 .owner = THIS_MODULE,
2330 .open = sg_proc_open_dev,
2331 .read = seq_read,
2332 .llseek = seq_lseek,
2333 .release = seq_release,
2334 };
2335 static const struct seq_operations dev_seq_ops = {
2336 .start = dev_seq_start,
2337 .next = dev_seq_next,
2338 .stop = dev_seq_stop,
2339 .show = sg_proc_seq_show_dev,
2340 };
2341
2342 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2343 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2344 static const struct file_operations devstrs_fops = {
2345 .owner = THIS_MODULE,
2346 .open = sg_proc_open_devstrs,
2347 .read = seq_read,
2348 .llseek = seq_lseek,
2349 .release = seq_release,
2350 };
2351 static const struct seq_operations devstrs_seq_ops = {
2352 .start = dev_seq_start,
2353 .next = dev_seq_next,
2354 .stop = dev_seq_stop,
2355 .show = sg_proc_seq_show_devstrs,
2356 };
2357
2358 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2359 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2360 static const struct file_operations debug_fops = {
2361 .owner = THIS_MODULE,
2362 .open = sg_proc_open_debug,
2363 .read = seq_read,
2364 .llseek = seq_lseek,
2365 .release = seq_release,
2366 };
2367 static const struct seq_operations debug_seq_ops = {
2368 .start = dev_seq_start,
2369 .next = dev_seq_next,
2370 .stop = dev_seq_stop,
2371 .show = sg_proc_seq_show_debug,
2372 };
2373
2374
2375 struct sg_proc_leaf {
2376 const char * name;
2377 const struct file_operations * fops;
2378 };
2379
2380 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2381 {"allow_dio", &adio_fops},
2382 {"debug", &debug_fops},
2383 {"def_reserved_size", &dressz_fops},
2384 {"device_hdr", &devhdr_fops},
2385 {"devices", &dev_fops},
2386 {"device_strs", &devstrs_fops},
2387 {"version", &version_fops}
2388 };
2389
2390 static int
2391 sg_proc_init(void)
2392 {
2393 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2394 int k;
2395
2396 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2397 if (!sg_proc_sgp)
2398 return 1;
2399 for (k = 0; k < num_leaves; ++k) {
2400 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2401 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2402 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2403 }
2404 return 0;
2405 }
2406
2407 static void
2408 sg_proc_cleanup(void)
2409 {
2410 int k;
2411 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2412
2413 if (!sg_proc_sgp)
2414 return;
2415 for (k = 0; k < num_leaves; ++k)
2416 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2417 remove_proc_entry(sg_proc_sg_dirname, NULL);
2418 }
2419
2420
2421 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2422 {
2423 seq_printf(s, "%d\n", *((int *)s->private));
2424 return 0;
2425 }
2426
2427 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2428 {
2429 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2430 }
2431
2432 static ssize_t
2433 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2434 size_t count, loff_t *off)
2435 {
2436 int err;
2437 unsigned long num;
2438
2439 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2440 return -EACCES;
2441 err = kstrtoul_from_user(buffer, count, 0, &num);
2442 if (err)
2443 return err;
2444 sg_allow_dio = num ? 1 : 0;
2445 return count;
2446 }
2447
2448 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2449 {
2450 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2451 }
2452
2453 static ssize_t
2454 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2455 size_t count, loff_t *off)
2456 {
2457 int err;
2458 unsigned long k = ULONG_MAX;
2459
2460 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2461 return -EACCES;
2462
2463 err = kstrtoul_from_user(buffer, count, 0, &k);
2464 if (err)
2465 return err;
2466 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2467 sg_big_buff = k;
2468 return count;
2469 }
2470 return -ERANGE;
2471 }
2472
2473 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2474 {
2475 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2476 sg_version_date);
2477 return 0;
2478 }
2479
2480 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2481 {
2482 return single_open(file, sg_proc_seq_show_version, NULL);
2483 }
2484
2485 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2486 {
2487 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
2488 return 0;
2489 }
2490
2491 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2492 {
2493 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2494 }
2495
2496 struct sg_proc_deviter {
2497 loff_t index;
2498 size_t max;
2499 };
2500
2501 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2502 {
2503 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2504
2505 s->private = it;
2506 if (! it)
2507 return NULL;
2508
2509 it->index = *pos;
2510 it->max = sg_last_dev();
2511 if (it->index >= it->max)
2512 return NULL;
2513 return it;
2514 }
2515
2516 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2517 {
2518 struct sg_proc_deviter * it = s->private;
2519
2520 *pos = ++it->index;
2521 return (it->index < it->max) ? it : NULL;
2522 }
2523
2524 static void dev_seq_stop(struct seq_file *s, void *v)
2525 {
2526 kfree(s->private);
2527 }
2528
2529 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2530 {
2531 return seq_open(file, &dev_seq_ops);
2532 }
2533
2534 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2535 {
2536 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2537 Sg_device *sdp;
2538 struct scsi_device *scsidp;
2539 unsigned long iflags;
2540
2541 read_lock_irqsave(&sg_index_lock, iflags);
2542 sdp = it ? sg_lookup_dev(it->index) : NULL;
2543 if ((NULL == sdp) || (NULL == sdp->device) ||
2544 (atomic_read(&sdp->detaching)))
2545 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2546 else {
2547 scsidp = sdp->device;
2548 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
2549 scsidp->host->host_no, scsidp->channel,
2550 scsidp->id, scsidp->lun, (int) scsidp->type,
2551 1,
2552 (int) scsidp->queue_depth,
2553 (int) atomic_read(&scsidp->device_busy),
2554 (int) scsi_device_online(scsidp));
2555 }
2556 read_unlock_irqrestore(&sg_index_lock, iflags);
2557 return 0;
2558 }
2559
2560 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2561 {
2562 return seq_open(file, &devstrs_seq_ops);
2563 }
2564
2565 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2566 {
2567 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2568 Sg_device *sdp;
2569 struct scsi_device *scsidp;
2570 unsigned long iflags;
2571
2572 read_lock_irqsave(&sg_index_lock, iflags);
2573 sdp = it ? sg_lookup_dev(it->index) : NULL;
2574 scsidp = sdp ? sdp->device : NULL;
2575 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
2576 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2577 scsidp->vendor, scsidp->model, scsidp->rev);
2578 else
2579 seq_puts(s, "<no active device>\n");
2580 read_unlock_irqrestore(&sg_index_lock, iflags);
2581 return 0;
2582 }
2583
2584 /* must be called while holding sg_index_lock */
2585 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2586 {
2587 int k, m, new_interface, blen, usg;
2588 Sg_request *srp;
2589 Sg_fd *fp;
2590 const sg_io_hdr_t *hp;
2591 const char * cp;
2592 unsigned int ms;
2593
2594 k = 0;
2595 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2596 k++;
2597 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2598 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2599 "(res)sgat=%d low_dma=%d\n", k,
2600 jiffies_to_msecs(fp->timeout),
2601 fp->reserve.bufflen,
2602 (int) fp->reserve.k_use_sg,
2603 (int) fp->low_dma);
2604 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2605 (int) fp->cmd_q, (int) fp->force_packid,
2606 (int) fp->keep_orphan);
2607 for (m = 0, srp = fp->headrp;
2608 srp != NULL;
2609 ++m, srp = srp->nextrp) {
2610 hp = &srp->header;
2611 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2612 if (srp->res_used) {
2613 if (new_interface &&
2614 (SG_FLAG_MMAP_IO & hp->flags))
2615 cp = " mmap>> ";
2616 else
2617 cp = " rb>> ";
2618 } else {
2619 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2620 cp = " dio>> ";
2621 else
2622 cp = " ";
2623 }
2624 seq_puts(s, cp);
2625 blen = srp->data.bufflen;
2626 usg = srp->data.k_use_sg;
2627 seq_puts(s, srp->done ?
2628 ((1 == srp->done) ? "rcv:" : "fin:")
2629 : "act:");
2630 seq_printf(s, " id=%d blen=%d",
2631 srp->header.pack_id, blen);
2632 if (srp->done)
2633 seq_printf(s, " dur=%d", hp->duration);
2634 else {
2635 ms = jiffies_to_msecs(jiffies);
2636 seq_printf(s, " t_o/elap=%d/%d",
2637 (new_interface ? hp->timeout :
2638 jiffies_to_msecs(fp->timeout)),
2639 (ms > hp->duration ? ms - hp->duration : 0));
2640 }
2641 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2642 (int) srp->data.cmd_opcode);
2643 }
2644 if (0 == m)
2645 seq_puts(s, " No requests active\n");
2646 read_unlock(&fp->rq_list_lock);
2647 }
2648 }
2649
2650 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2651 {
2652 return seq_open(file, &debug_seq_ops);
2653 }
2654
2655 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2656 {
2657 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2658 Sg_device *sdp;
2659 unsigned long iflags;
2660
2661 if (it && (0 == it->index))
2662 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2663 (int)it->max, sg_big_buff);
2664
2665 read_lock_irqsave(&sg_index_lock, iflags);
2666 sdp = it ? sg_lookup_dev(it->index) : NULL;
2667 if (NULL == sdp)
2668 goto skip;
2669 read_lock(&sdp->sfd_lock);
2670 if (!list_empty(&sdp->sfds)) {
2671 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2672 if (atomic_read(&sdp->detaching))
2673 seq_puts(s, "detaching pending close ");
2674 else if (sdp->device) {
2675 struct scsi_device *scsidp = sdp->device;
2676
2677 seq_printf(s, "%d:%d:%d:%llu em=%d",
2678 scsidp->host->host_no,
2679 scsidp->channel, scsidp->id,
2680 scsidp->lun,
2681 scsidp->host->hostt->emulated);
2682 }
2683 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2684 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
2685 sg_proc_debug_helper(s, sdp);
2686 }
2687 read_unlock(&sdp->sfd_lock);
2688 skip:
2689 read_unlock_irqrestore(&sg_index_lock, iflags);
2690 return 0;
2691 }
2692
2693 #endif /* CONFIG_SCSI_PROC_FS */
2694
2695 module_init(init_sg);
2696 module_exit(exit_sg);
Linux with added FPC-III support