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sg: fix EWOULDBLOCK errors with scsi-mq
[deliverable/linux.git] / drivers / scsi / sg.c
1 /*
2 * History:
3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
4 * to allow user process control of SCSI devices.
5 * Development Sponsored by Killy Corp. NY NY
6 *
7 * Original driver (sg.c):
8 * Copyright (C) 1992 Lawrence Foard
9 * Version 2 and 3 extensions to driver:
10 * Copyright (C) 1998 - 2014 Douglas Gilbert
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 */
18
19 static int sg_version_num = 30536; /* 2 digits for each component */
20 #define SG_VERSION_STR "3.5.36"
21
22 /*
23 * D. P. Gilbert (dgilbert@interlog.com), notes:
24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
26 * (otherwise the macros compile to empty statements).
27 *
28 */
29 #include <linux/module.h>
30
31 #include <linux/fs.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/string.h>
35 #include <linux/mm.h>
36 #include <linux/aio.h>
37 #include <linux/errno.h>
38 #include <linux/mtio.h>
39 #include <linux/ioctl.h>
40 #include <linux/slab.h>
41 #include <linux/fcntl.h>
42 #include <linux/init.h>
43 #include <linux/poll.h>
44 #include <linux/moduleparam.h>
45 #include <linux/cdev.h>
46 #include <linux/idr.h>
47 #include <linux/seq_file.h>
48 #include <linux/blkdev.h>
49 #include <linux/delay.h>
50 #include <linux/blktrace_api.h>
51 #include <linux/mutex.h>
52 #include <linux/atomic.h>
53 #include <linux/ratelimit.h>
54
55 #include "scsi.h"
56 #include <scsi/scsi_dbg.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_driver.h>
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/sg.h>
61
62 #include "scsi_logging.h"
63
64 #ifdef CONFIG_SCSI_PROC_FS
65 #include <linux/proc_fs.h>
66 static char *sg_version_date = "20140603";
67
68 static int sg_proc_init(void);
69 static void sg_proc_cleanup(void);
70 #endif
71
72 #define SG_ALLOW_DIO_DEF 0
73
74 #define SG_MAX_DEVS 32768
75
76 /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type
77 * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater
78 * than 16 bytes are "variable length" whose length is a multiple of 4
79 */
80 #define SG_MAX_CDB_SIZE 252
81
82 /*
83 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
84 * Then when using 32 bit integers x * m may overflow during the calculation.
85 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
86 * calculates the same, but prevents the overflow when both m and d
87 * are "small" numbers (like HZ and USER_HZ).
88 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
89 * in 32 bits.
90 */
91 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
92
93 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
94
95 int sg_big_buff = SG_DEF_RESERVED_SIZE;
96 /* N.B. This variable is readable and writeable via
97 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
98 of this size (or less if there is not enough memory) will be reserved
99 for use by this file descriptor. [Deprecated usage: this variable is also
100 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
101 the kernel (i.e. it is not a module).] */
102 static int def_reserved_size = -1; /* picks up init parameter */
103 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
104
105 static int scatter_elem_sz = SG_SCATTER_SZ;
106 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
107
108 #define SG_SECTOR_SZ 512
109
110 static int sg_add_device(struct device *, struct class_interface *);
111 static void sg_remove_device(struct device *, struct class_interface *);
112
113 static DEFINE_IDR(sg_index_idr);
114 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
115 file descriptor list for device */
116
117 static struct class_interface sg_interface = {
118 .add_dev = sg_add_device,
119 .remove_dev = sg_remove_device,
120 };
121
122 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
123 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
124 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
125 unsigned bufflen; /* Size of (aggregate) data buffer */
126 struct page **pages;
127 int page_order;
128 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
129 unsigned char cmd_opcode; /* first byte of command */
130 } Sg_scatter_hold;
131
132 struct sg_device; /* forward declarations */
133 struct sg_fd;
134
135 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
136 struct sg_request *nextrp; /* NULL -> tail request (slist) */
137 struct sg_fd *parentfp; /* NULL -> not in use */
138 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
139 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
140 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
141 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
142 char orphan; /* 1 -> drop on sight, 0 -> normal */
143 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
144 /* done protected by rq_list_lock */
145 char done; /* 0->before bh, 1->before read, 2->read */
146 struct request *rq;
147 struct bio *bio;
148 struct execute_work ew;
149 } Sg_request;
150
151 typedef struct sg_fd { /* holds the state of a file descriptor */
152 struct list_head sfd_siblings; /* protected by device's sfd_lock */
153 struct sg_device *parentdp; /* owning device */
154 wait_queue_head_t read_wait; /* queue read until command done */
155 rwlock_t rq_list_lock; /* protect access to list in req_arr */
156 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
157 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
158 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
159 unsigned save_scat_len; /* original length of trunc. scat. element */
160 Sg_request *headrp; /* head of request slist, NULL->empty */
161 struct fasync_struct *async_qp; /* used by asynchronous notification */
162 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
163 char low_dma; /* as in parent but possibly overridden to 1 */
164 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
165 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
166 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */
167 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
168 char mmap_called; /* 0 -> mmap() never called on this fd */
169 struct kref f_ref;
170 struct execute_work ew;
171 } Sg_fd;
172
173 typedef struct sg_device { /* holds the state of each scsi generic device */
174 struct scsi_device *device;
175 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */
176 struct mutex open_rel_lock; /* held when in open() or release() */
177 int sg_tablesize; /* adapter's max scatter-gather table size */
178 u32 index; /* device index number */
179 struct list_head sfds;
180 rwlock_t sfd_lock; /* protect access to sfd list */
181 atomic_t detaching; /* 0->device usable, 1->device detaching */
182 bool exclude; /* 1->open(O_EXCL) succeeded and is active */
183 int open_cnt; /* count of opens (perhaps < num(sfds) ) */
184 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
185 struct gendisk *disk;
186 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
187 struct kref d_ref;
188 } Sg_device;
189
190 /* tasklet or soft irq callback */
191 static void sg_rq_end_io(struct request *rq, int uptodate);
192 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
193 static int sg_finish_rem_req(Sg_request * srp);
194 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
195 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
196 Sg_request * srp);
197 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
198 const char __user *buf, size_t count, int blocking,
199 int read_only, int sg_io_owned, Sg_request **o_srp);
200 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
201 unsigned char *cmnd, int timeout, int blocking);
202 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
203 static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp);
204 static void sg_build_reserve(Sg_fd * sfp, int req_size);
205 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
206 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
207 static Sg_fd *sg_add_sfp(Sg_device * sdp);
208 static void sg_remove_sfp(struct kref *);
209 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
210 static Sg_request *sg_add_request(Sg_fd * sfp);
211 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
212 static int sg_res_in_use(Sg_fd * sfp);
213 static Sg_device *sg_get_dev(int dev);
214 static void sg_device_destroy(struct kref *kref);
215
216 #define SZ_SG_HEADER sizeof(struct sg_header)
217 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
218 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
219 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
220
221 #define sg_printk(prefix, sdp, fmt, a...) \
222 sdev_prefix_printk(prefix, (sdp)->device, \
223 (sdp)->disk->disk_name, fmt, ##a)
224
225 static int sg_allow_access(struct file *filp, unsigned char *cmd)
226 {
227 struct sg_fd *sfp = filp->private_data;
228
229 if (sfp->parentdp->device->type == TYPE_SCANNER)
230 return 0;
231
232 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
233 }
234
235 static int
236 open_wait(Sg_device *sdp, int flags)
237 {
238 int retval = 0;
239
240 if (flags & O_EXCL) {
241 while (sdp->open_cnt > 0) {
242 mutex_unlock(&sdp->open_rel_lock);
243 retval = wait_event_interruptible(sdp->open_wait,
244 (atomic_read(&sdp->detaching) ||
245 !sdp->open_cnt));
246 mutex_lock(&sdp->open_rel_lock);
247
248 if (retval) /* -ERESTARTSYS */
249 return retval;
250 if (atomic_read(&sdp->detaching))
251 return -ENODEV;
252 }
253 } else {
254 while (sdp->exclude) {
255 mutex_unlock(&sdp->open_rel_lock);
256 retval = wait_event_interruptible(sdp->open_wait,
257 (atomic_read(&sdp->detaching) ||
258 !sdp->exclude));
259 mutex_lock(&sdp->open_rel_lock);
260
261 if (retval) /* -ERESTARTSYS */
262 return retval;
263 if (atomic_read(&sdp->detaching))
264 return -ENODEV;
265 }
266 }
267
268 return retval;
269 }
270
271 /* Returns 0 on success, else a negated errno value */
272 static int
273 sg_open(struct inode *inode, struct file *filp)
274 {
275 int dev = iminor(inode);
276 int flags = filp->f_flags;
277 struct request_queue *q;
278 Sg_device *sdp;
279 Sg_fd *sfp;
280 int retval;
281
282 nonseekable_open(inode, filp);
283 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
284 return -EPERM; /* Can't lock it with read only access */
285 sdp = sg_get_dev(dev);
286 if (IS_ERR(sdp))
287 return PTR_ERR(sdp);
288
289 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
290 "sg_open: flags=0x%x\n", flags));
291
292 /* This driver's module count bumped by fops_get in <linux/fs.h> */
293 /* Prevent the device driver from vanishing while we sleep */
294 retval = scsi_device_get(sdp->device);
295 if (retval)
296 goto sg_put;
297
298 retval = scsi_autopm_get_device(sdp->device);
299 if (retval)
300 goto sdp_put;
301
302 /* scsi_block_when_processing_errors() may block so bypass
303 * check if O_NONBLOCK. Permits SCSI commands to be issued
304 * during error recovery. Tread carefully. */
305 if (!((flags & O_NONBLOCK) ||
306 scsi_block_when_processing_errors(sdp->device))) {
307 retval = -ENXIO;
308 /* we are in error recovery for this device */
309 goto error_out;
310 }
311
312 mutex_lock(&sdp->open_rel_lock);
313 if (flags & O_NONBLOCK) {
314 if (flags & O_EXCL) {
315 if (sdp->open_cnt > 0) {
316 retval = -EBUSY;
317 goto error_mutex_locked;
318 }
319 } else {
320 if (sdp->exclude) {
321 retval = -EBUSY;
322 goto error_mutex_locked;
323 }
324 }
325 } else {
326 retval = open_wait(sdp, flags);
327 if (retval) /* -ERESTARTSYS or -ENODEV */
328 goto error_mutex_locked;
329 }
330
331 /* N.B. at this point we are holding the open_rel_lock */
332 if (flags & O_EXCL)
333 sdp->exclude = true;
334
335 if (sdp->open_cnt < 1) { /* no existing opens */
336 sdp->sgdebug = 0;
337 q = sdp->device->request_queue;
338 sdp->sg_tablesize = queue_max_segments(q);
339 }
340 sfp = sg_add_sfp(sdp);
341 if (IS_ERR(sfp)) {
342 retval = PTR_ERR(sfp);
343 goto out_undo;
344 }
345
346 filp->private_data = sfp;
347 sdp->open_cnt++;
348 mutex_unlock(&sdp->open_rel_lock);
349
350 retval = 0;
351 sg_put:
352 kref_put(&sdp->d_ref, sg_device_destroy);
353 return retval;
354
355 out_undo:
356 if (flags & O_EXCL) {
357 sdp->exclude = false; /* undo if error */
358 wake_up_interruptible(&sdp->open_wait);
359 }
360 error_mutex_locked:
361 mutex_unlock(&sdp->open_rel_lock);
362 error_out:
363 scsi_autopm_put_device(sdp->device);
364 sdp_put:
365 scsi_device_put(sdp->device);
366 goto sg_put;
367 }
368
369 /* Release resources associated with a successful sg_open()
370 * Returns 0 on success, else a negated errno value */
371 static int
372 sg_release(struct inode *inode, struct file *filp)
373 {
374 Sg_device *sdp;
375 Sg_fd *sfp;
376
377 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
378 return -ENXIO;
379 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
380
381 mutex_lock(&sdp->open_rel_lock);
382 scsi_autopm_put_device(sdp->device);
383 kref_put(&sfp->f_ref, sg_remove_sfp);
384 sdp->open_cnt--;
385
386 /* possibly many open()s waiting on exlude clearing, start many;
387 * only open(O_EXCL)s wait on 0==open_cnt so only start one */
388 if (sdp->exclude) {
389 sdp->exclude = false;
390 wake_up_interruptible_all(&sdp->open_wait);
391 } else if (0 == sdp->open_cnt) {
392 wake_up_interruptible(&sdp->open_wait);
393 }
394 mutex_unlock(&sdp->open_rel_lock);
395 return 0;
396 }
397
398 static ssize_t
399 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
400 {
401 Sg_device *sdp;
402 Sg_fd *sfp;
403 Sg_request *srp;
404 int req_pack_id = -1;
405 sg_io_hdr_t *hp;
406 struct sg_header *old_hdr = NULL;
407 int retval = 0;
408
409 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
410 return -ENXIO;
411 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
412 "sg_read: count=%d\n", (int) count));
413
414 if (!access_ok(VERIFY_WRITE, buf, count))
415 return -EFAULT;
416 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
417 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
418 if (!old_hdr)
419 return -ENOMEM;
420 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
421 retval = -EFAULT;
422 goto free_old_hdr;
423 }
424 if (old_hdr->reply_len < 0) {
425 if (count >= SZ_SG_IO_HDR) {
426 sg_io_hdr_t *new_hdr;
427 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
428 if (!new_hdr) {
429 retval = -ENOMEM;
430 goto free_old_hdr;
431 }
432 retval =__copy_from_user
433 (new_hdr, buf, SZ_SG_IO_HDR);
434 req_pack_id = new_hdr->pack_id;
435 kfree(new_hdr);
436 if (retval) {
437 retval = -EFAULT;
438 goto free_old_hdr;
439 }
440 }
441 } else
442 req_pack_id = old_hdr->pack_id;
443 }
444 srp = sg_get_rq_mark(sfp, req_pack_id);
445 if (!srp) { /* now wait on packet to arrive */
446 if (atomic_read(&sdp->detaching)) {
447 retval = -ENODEV;
448 goto free_old_hdr;
449 }
450 if (filp->f_flags & O_NONBLOCK) {
451 retval = -EAGAIN;
452 goto free_old_hdr;
453 }
454 retval = wait_event_interruptible(sfp->read_wait,
455 (atomic_read(&sdp->detaching) ||
456 (srp = sg_get_rq_mark(sfp, req_pack_id))));
457 if (atomic_read(&sdp->detaching)) {
458 retval = -ENODEV;
459 goto free_old_hdr;
460 }
461 if (retval) {
462 /* -ERESTARTSYS as signal hit process */
463 goto free_old_hdr;
464 }
465 }
466 if (srp->header.interface_id != '\0') {
467 retval = sg_new_read(sfp, buf, count, srp);
468 goto free_old_hdr;
469 }
470
471 hp = &srp->header;
472 if (old_hdr == NULL) {
473 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
474 if (! old_hdr) {
475 retval = -ENOMEM;
476 goto free_old_hdr;
477 }
478 }
479 memset(old_hdr, 0, SZ_SG_HEADER);
480 old_hdr->reply_len = (int) hp->timeout;
481 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
482 old_hdr->pack_id = hp->pack_id;
483 old_hdr->twelve_byte =
484 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
485 old_hdr->target_status = hp->masked_status;
486 old_hdr->host_status = hp->host_status;
487 old_hdr->driver_status = hp->driver_status;
488 if ((CHECK_CONDITION & hp->masked_status) ||
489 (DRIVER_SENSE & hp->driver_status))
490 memcpy(old_hdr->sense_buffer, srp->sense_b,
491 sizeof (old_hdr->sense_buffer));
492 switch (hp->host_status) {
493 /* This setup of 'result' is for backward compatibility and is best
494 ignored by the user who should use target, host + driver status */
495 case DID_OK:
496 case DID_PASSTHROUGH:
497 case DID_SOFT_ERROR:
498 old_hdr->result = 0;
499 break;
500 case DID_NO_CONNECT:
501 case DID_BUS_BUSY:
502 case DID_TIME_OUT:
503 old_hdr->result = EBUSY;
504 break;
505 case DID_BAD_TARGET:
506 case DID_ABORT:
507 case DID_PARITY:
508 case DID_RESET:
509 case DID_BAD_INTR:
510 old_hdr->result = EIO;
511 break;
512 case DID_ERROR:
513 old_hdr->result = (srp->sense_b[0] == 0 &&
514 hp->masked_status == GOOD) ? 0 : EIO;
515 break;
516 default:
517 old_hdr->result = EIO;
518 break;
519 }
520
521 /* Now copy the result back to the user buffer. */
522 if (count >= SZ_SG_HEADER) {
523 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
524 retval = -EFAULT;
525 goto free_old_hdr;
526 }
527 buf += SZ_SG_HEADER;
528 if (count > old_hdr->reply_len)
529 count = old_hdr->reply_len;
530 if (count > SZ_SG_HEADER) {
531 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
532 retval = -EFAULT;
533 goto free_old_hdr;
534 }
535 }
536 } else
537 count = (old_hdr->result == 0) ? 0 : -EIO;
538 sg_finish_rem_req(srp);
539 retval = count;
540 free_old_hdr:
541 kfree(old_hdr);
542 return retval;
543 }
544
545 static ssize_t
546 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
547 {
548 sg_io_hdr_t *hp = &srp->header;
549 int err = 0, err2;
550 int len;
551
552 if (count < SZ_SG_IO_HDR) {
553 err = -EINVAL;
554 goto err_out;
555 }
556 hp->sb_len_wr = 0;
557 if ((hp->mx_sb_len > 0) && hp->sbp) {
558 if ((CHECK_CONDITION & hp->masked_status) ||
559 (DRIVER_SENSE & hp->driver_status)) {
560 int sb_len = SCSI_SENSE_BUFFERSIZE;
561 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
562 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
563 len = (len > sb_len) ? sb_len : len;
564 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
565 err = -EFAULT;
566 goto err_out;
567 }
568 hp->sb_len_wr = len;
569 }
570 }
571 if (hp->masked_status || hp->host_status || hp->driver_status)
572 hp->info |= SG_INFO_CHECK;
573 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
574 err = -EFAULT;
575 goto err_out;
576 }
577 err_out:
578 err2 = sg_finish_rem_req(srp);
579 return err ? : err2 ? : count;
580 }
581
582 static ssize_t
583 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
584 {
585 int mxsize, cmd_size, k;
586 int input_size, blocking;
587 unsigned char opcode;
588 Sg_device *sdp;
589 Sg_fd *sfp;
590 Sg_request *srp;
591 struct sg_header old_hdr;
592 sg_io_hdr_t *hp;
593 unsigned char cmnd[SG_MAX_CDB_SIZE];
594
595 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
596 return -ENXIO;
597 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
598 "sg_write: count=%d\n", (int) count));
599 if (atomic_read(&sdp->detaching))
600 return -ENODEV;
601 if (!((filp->f_flags & O_NONBLOCK) ||
602 scsi_block_when_processing_errors(sdp->device)))
603 return -ENXIO;
604
605 if (!access_ok(VERIFY_READ, buf, count))
606 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
607 if (count < SZ_SG_HEADER)
608 return -EIO;
609 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
610 return -EFAULT;
611 blocking = !(filp->f_flags & O_NONBLOCK);
612 if (old_hdr.reply_len < 0)
613 return sg_new_write(sfp, filp, buf, count,
614 blocking, 0, 0, NULL);
615 if (count < (SZ_SG_HEADER + 6))
616 return -EIO; /* The minimum scsi command length is 6 bytes. */
617
618 if (!(srp = sg_add_request(sfp))) {
619 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
620 "sg_write: queue full\n"));
621 return -EDOM;
622 }
623 buf += SZ_SG_HEADER;
624 __get_user(opcode, buf);
625 if (sfp->next_cmd_len > 0) {
626 cmd_size = sfp->next_cmd_len;
627 sfp->next_cmd_len = 0; /* reset so only this write() effected */
628 } else {
629 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
630 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
631 cmd_size = 12;
632 }
633 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
634 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
635 /* Determine buffer size. */
636 input_size = count - cmd_size;
637 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
638 mxsize -= SZ_SG_HEADER;
639 input_size -= SZ_SG_HEADER;
640 if (input_size < 0) {
641 sg_remove_request(sfp, srp);
642 return -EIO; /* User did not pass enough bytes for this command. */
643 }
644 hp = &srp->header;
645 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
646 hp->cmd_len = (unsigned char) cmd_size;
647 hp->iovec_count = 0;
648 hp->mx_sb_len = 0;
649 if (input_size > 0)
650 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
651 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
652 else
653 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
654 hp->dxfer_len = mxsize;
655 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
656 hp->dxferp = (char __user *)buf + cmd_size;
657 else
658 hp->dxferp = NULL;
659 hp->sbp = NULL;
660 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
661 hp->flags = input_size; /* structure abuse ... */
662 hp->pack_id = old_hdr.pack_id;
663 hp->usr_ptr = NULL;
664 if (__copy_from_user(cmnd, buf, cmd_size))
665 return -EFAULT;
666 /*
667 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
668 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
669 * is a non-zero input_size, so emit a warning.
670 */
671 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
672 static char cmd[TASK_COMM_LEN];
673 if (strcmp(current->comm, cmd)) {
674 printk_ratelimited(KERN_WARNING
675 "sg_write: data in/out %d/%d bytes "
676 "for SCSI command 0x%x-- guessing "
677 "data in;\n program %s not setting "
678 "count and/or reply_len properly\n",
679 old_hdr.reply_len - (int)SZ_SG_HEADER,
680 input_size, (unsigned int) cmnd[0],
681 current->comm);
682 strcpy(cmd, current->comm);
683 }
684 }
685 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
686 return (k < 0) ? k : count;
687 }
688
689 static ssize_t
690 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
691 size_t count, int blocking, int read_only, int sg_io_owned,
692 Sg_request **o_srp)
693 {
694 int k;
695 Sg_request *srp;
696 sg_io_hdr_t *hp;
697 unsigned char cmnd[SG_MAX_CDB_SIZE];
698 int timeout;
699 unsigned long ul_timeout;
700
701 if (count < SZ_SG_IO_HDR)
702 return -EINVAL;
703 if (!access_ok(VERIFY_READ, buf, count))
704 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
705
706 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
707 if (!(srp = sg_add_request(sfp))) {
708 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
709 "sg_new_write: queue full\n"));
710 return -EDOM;
711 }
712 srp->sg_io_owned = sg_io_owned;
713 hp = &srp->header;
714 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
715 sg_remove_request(sfp, srp);
716 return -EFAULT;
717 }
718 if (hp->interface_id != 'S') {
719 sg_remove_request(sfp, srp);
720 return -ENOSYS;
721 }
722 if (hp->flags & SG_FLAG_MMAP_IO) {
723 if (hp->dxfer_len > sfp->reserve.bufflen) {
724 sg_remove_request(sfp, srp);
725 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
726 }
727 if (hp->flags & SG_FLAG_DIRECT_IO) {
728 sg_remove_request(sfp, srp);
729 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
730 }
731 if (sg_res_in_use(sfp)) {
732 sg_remove_request(sfp, srp);
733 return -EBUSY; /* reserve buffer already being used */
734 }
735 }
736 ul_timeout = msecs_to_jiffies(srp->header.timeout);
737 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
738 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
739 sg_remove_request(sfp, srp);
740 return -EMSGSIZE;
741 }
742 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
743 sg_remove_request(sfp, srp);
744 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
745 }
746 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
747 sg_remove_request(sfp, srp);
748 return -EFAULT;
749 }
750 if (read_only && sg_allow_access(file, cmnd)) {
751 sg_remove_request(sfp, srp);
752 return -EPERM;
753 }
754 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
755 if (k < 0)
756 return k;
757 if (o_srp)
758 *o_srp = srp;
759 return count;
760 }
761
762 static int
763 sg_common_write(Sg_fd * sfp, Sg_request * srp,
764 unsigned char *cmnd, int timeout, int blocking)
765 {
766 int k, at_head;
767 Sg_device *sdp = sfp->parentdp;
768 sg_io_hdr_t *hp = &srp->header;
769
770 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
771 hp->status = 0;
772 hp->masked_status = 0;
773 hp->msg_status = 0;
774 hp->info = 0;
775 hp->host_status = 0;
776 hp->driver_status = 0;
777 hp->resid = 0;
778 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
779 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
780 (int) cmnd[0], (int) hp->cmd_len));
781
782 k = sg_start_req(srp, cmnd);
783 if (k) {
784 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
785 "sg_common_write: start_req err=%d\n", k));
786 sg_finish_rem_req(srp);
787 return k; /* probably out of space --> ENOMEM */
788 }
789 if (atomic_read(&sdp->detaching)) {
790 if (srp->bio)
791 blk_end_request_all(srp->rq, -EIO);
792 sg_finish_rem_req(srp);
793 return -ENODEV;
794 }
795
796 hp->duration = jiffies_to_msecs(jiffies);
797 if (hp->interface_id != '\0' && /* v3 (or later) interface */
798 (SG_FLAG_Q_AT_TAIL & hp->flags))
799 at_head = 0;
800 else
801 at_head = 1;
802
803 srp->rq->timeout = timeout;
804 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
805 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
806 srp->rq, at_head, sg_rq_end_io);
807 return 0;
808 }
809
810 static int srp_done(Sg_fd *sfp, Sg_request *srp)
811 {
812 unsigned long flags;
813 int ret;
814
815 read_lock_irqsave(&sfp->rq_list_lock, flags);
816 ret = srp->done;
817 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
818 return ret;
819 }
820
821 static int max_sectors_bytes(struct request_queue *q)
822 {
823 unsigned int max_sectors = queue_max_sectors(q);
824
825 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
826
827 return max_sectors << 9;
828 }
829
830 static long
831 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
832 {
833 void __user *p = (void __user *)arg;
834 int __user *ip = p;
835 int result, val, read_only;
836 Sg_device *sdp;
837 Sg_fd *sfp;
838 Sg_request *srp;
839 unsigned long iflags;
840
841 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
842 return -ENXIO;
843
844 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
845 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
846 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
847
848 switch (cmd_in) {
849 case SG_IO:
850 if (atomic_read(&sdp->detaching))
851 return -ENODEV;
852 if (!scsi_block_when_processing_errors(sdp->device))
853 return -ENXIO;
854 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
855 return -EFAULT;
856 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
857 1, read_only, 1, &srp);
858 if (result < 0)
859 return result;
860 result = wait_event_interruptible(sfp->read_wait,
861 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
862 if (atomic_read(&sdp->detaching))
863 return -ENODEV;
864 write_lock_irq(&sfp->rq_list_lock);
865 if (srp->done) {
866 srp->done = 2;
867 write_unlock_irq(&sfp->rq_list_lock);
868 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
869 return (result < 0) ? result : 0;
870 }
871 srp->orphan = 1;
872 write_unlock_irq(&sfp->rq_list_lock);
873 return result; /* -ERESTARTSYS because signal hit process */
874 case SG_SET_TIMEOUT:
875 result = get_user(val, ip);
876 if (result)
877 return result;
878 if (val < 0)
879 return -EIO;
880 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
881 val = MULDIV (INT_MAX, USER_HZ, HZ);
882 sfp->timeout_user = val;
883 sfp->timeout = MULDIV (val, HZ, USER_HZ);
884
885 return 0;
886 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
887 /* strange ..., for backward compatibility */
888 return sfp->timeout_user;
889 case SG_SET_FORCE_LOW_DMA:
890 result = get_user(val, ip);
891 if (result)
892 return result;
893 if (val) {
894 sfp->low_dma = 1;
895 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
896 val = (int) sfp->reserve.bufflen;
897 sg_remove_scat(sfp, &sfp->reserve);
898 sg_build_reserve(sfp, val);
899 }
900 } else {
901 if (atomic_read(&sdp->detaching))
902 return -ENODEV;
903 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
904 }
905 return 0;
906 case SG_GET_LOW_DMA:
907 return put_user((int) sfp->low_dma, ip);
908 case SG_GET_SCSI_ID:
909 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
910 return -EFAULT;
911 else {
912 sg_scsi_id_t __user *sg_idp = p;
913
914 if (atomic_read(&sdp->detaching))
915 return -ENODEV;
916 __put_user((int) sdp->device->host->host_no,
917 &sg_idp->host_no);
918 __put_user((int) sdp->device->channel,
919 &sg_idp->channel);
920 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
921 __put_user((int) sdp->device->lun, &sg_idp->lun);
922 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
923 __put_user((short) sdp->device->host->cmd_per_lun,
924 &sg_idp->h_cmd_per_lun);
925 __put_user((short) sdp->device->queue_depth,
926 &sg_idp->d_queue_depth);
927 __put_user(0, &sg_idp->unused[0]);
928 __put_user(0, &sg_idp->unused[1]);
929 return 0;
930 }
931 case SG_SET_FORCE_PACK_ID:
932 result = get_user(val, ip);
933 if (result)
934 return result;
935 sfp->force_packid = val ? 1 : 0;
936 return 0;
937 case SG_GET_PACK_ID:
938 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
939 return -EFAULT;
940 read_lock_irqsave(&sfp->rq_list_lock, iflags);
941 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
942 if ((1 == srp->done) && (!srp->sg_io_owned)) {
943 read_unlock_irqrestore(&sfp->rq_list_lock,
944 iflags);
945 __put_user(srp->header.pack_id, ip);
946 return 0;
947 }
948 }
949 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
950 __put_user(-1, ip);
951 return 0;
952 case SG_GET_NUM_WAITING:
953 read_lock_irqsave(&sfp->rq_list_lock, iflags);
954 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
955 if ((1 == srp->done) && (!srp->sg_io_owned))
956 ++val;
957 }
958 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
959 return put_user(val, ip);
960 case SG_GET_SG_TABLESIZE:
961 return put_user(sdp->sg_tablesize, ip);
962 case SG_SET_RESERVED_SIZE:
963 result = get_user(val, ip);
964 if (result)
965 return result;
966 if (val < 0)
967 return -EINVAL;
968 val = min_t(int, val,
969 max_sectors_bytes(sdp->device->request_queue));
970 if (val != sfp->reserve.bufflen) {
971 if (sg_res_in_use(sfp) || sfp->mmap_called)
972 return -EBUSY;
973 sg_remove_scat(sfp, &sfp->reserve);
974 sg_build_reserve(sfp, val);
975 }
976 return 0;
977 case SG_GET_RESERVED_SIZE:
978 val = min_t(int, sfp->reserve.bufflen,
979 max_sectors_bytes(sdp->device->request_queue));
980 return put_user(val, ip);
981 case SG_SET_COMMAND_Q:
982 result = get_user(val, ip);
983 if (result)
984 return result;
985 sfp->cmd_q = val ? 1 : 0;
986 return 0;
987 case SG_GET_COMMAND_Q:
988 return put_user((int) sfp->cmd_q, ip);
989 case SG_SET_KEEP_ORPHAN:
990 result = get_user(val, ip);
991 if (result)
992 return result;
993 sfp->keep_orphan = val;
994 return 0;
995 case SG_GET_KEEP_ORPHAN:
996 return put_user((int) sfp->keep_orphan, ip);
997 case SG_NEXT_CMD_LEN:
998 result = get_user(val, ip);
999 if (result)
1000 return result;
1001 sfp->next_cmd_len = (val > 0) ? val : 0;
1002 return 0;
1003 case SG_GET_VERSION_NUM:
1004 return put_user(sg_version_num, ip);
1005 case SG_GET_ACCESS_COUNT:
1006 /* faked - we don't have a real access count anymore */
1007 val = (sdp->device ? 1 : 0);
1008 return put_user(val, ip);
1009 case SG_GET_REQUEST_TABLE:
1010 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1011 return -EFAULT;
1012 else {
1013 sg_req_info_t *rinfo;
1014 unsigned int ms;
1015
1016 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1017 GFP_KERNEL);
1018 if (!rinfo)
1019 return -ENOMEM;
1020 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1021 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1022 ++val, srp = srp ? srp->nextrp : srp) {
1023 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1024 if (srp) {
1025 rinfo[val].req_state = srp->done + 1;
1026 rinfo[val].problem =
1027 srp->header.masked_status &
1028 srp->header.host_status &
1029 srp->header.driver_status;
1030 if (srp->done)
1031 rinfo[val].duration =
1032 srp->header.duration;
1033 else {
1034 ms = jiffies_to_msecs(jiffies);
1035 rinfo[val].duration =
1036 (ms > srp->header.duration) ?
1037 (ms - srp->header.duration) : 0;
1038 }
1039 rinfo[val].orphan = srp->orphan;
1040 rinfo[val].sg_io_owned =
1041 srp->sg_io_owned;
1042 rinfo[val].pack_id =
1043 srp->header.pack_id;
1044 rinfo[val].usr_ptr =
1045 srp->header.usr_ptr;
1046 }
1047 }
1048 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1049 result = __copy_to_user(p, rinfo,
1050 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1051 result = result ? -EFAULT : 0;
1052 kfree(rinfo);
1053 return result;
1054 }
1055 case SG_EMULATED_HOST:
1056 if (atomic_read(&sdp->detaching))
1057 return -ENODEV;
1058 return put_user(sdp->device->host->hostt->emulated, ip);
1059 case SCSI_IOCTL_SEND_COMMAND:
1060 if (atomic_read(&sdp->detaching))
1061 return -ENODEV;
1062 if (read_only) {
1063 unsigned char opcode = WRITE_6;
1064 Scsi_Ioctl_Command __user *siocp = p;
1065
1066 if (copy_from_user(&opcode, siocp->data, 1))
1067 return -EFAULT;
1068 if (sg_allow_access(filp, &opcode))
1069 return -EPERM;
1070 }
1071 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1072 case SG_SET_DEBUG:
1073 result = get_user(val, ip);
1074 if (result)
1075 return result;
1076 sdp->sgdebug = (char) val;
1077 return 0;
1078 case BLKSECTGET:
1079 return put_user(max_sectors_bytes(sdp->device->request_queue),
1080 ip);
1081 case BLKTRACESETUP:
1082 return blk_trace_setup(sdp->device->request_queue,
1083 sdp->disk->disk_name,
1084 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1085 NULL,
1086 (char *)arg);
1087 case BLKTRACESTART:
1088 return blk_trace_startstop(sdp->device->request_queue, 1);
1089 case BLKTRACESTOP:
1090 return blk_trace_startstop(sdp->device->request_queue, 0);
1091 case BLKTRACETEARDOWN:
1092 return blk_trace_remove(sdp->device->request_queue);
1093 case SCSI_IOCTL_GET_IDLUN:
1094 case SCSI_IOCTL_GET_BUS_NUMBER:
1095 case SCSI_IOCTL_PROBE_HOST:
1096 case SG_GET_TRANSFORM:
1097 case SG_SCSI_RESET:
1098 if (atomic_read(&sdp->detaching))
1099 return -ENODEV;
1100 break;
1101 default:
1102 if (read_only)
1103 return -EPERM; /* don't know so take safe approach */
1104 break;
1105 }
1106
1107 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1108 cmd_in, filp->f_flags & O_NDELAY);
1109 if (result)
1110 return result;
1111 return scsi_ioctl(sdp->device, cmd_in, p);
1112 }
1113
1114 #ifdef CONFIG_COMPAT
1115 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1116 {
1117 Sg_device *sdp;
1118 Sg_fd *sfp;
1119 struct scsi_device *sdev;
1120
1121 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1122 return -ENXIO;
1123
1124 sdev = sdp->device;
1125 if (sdev->host->hostt->compat_ioctl) {
1126 int ret;
1127
1128 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1129
1130 return ret;
1131 }
1132
1133 return -ENOIOCTLCMD;
1134 }
1135 #endif
1136
1137 static unsigned int
1138 sg_poll(struct file *filp, poll_table * wait)
1139 {
1140 unsigned int res = 0;
1141 Sg_device *sdp;
1142 Sg_fd *sfp;
1143 Sg_request *srp;
1144 int count = 0;
1145 unsigned long iflags;
1146
1147 sfp = filp->private_data;
1148 if (!sfp)
1149 return POLLERR;
1150 sdp = sfp->parentdp;
1151 if (!sdp)
1152 return POLLERR;
1153 poll_wait(filp, &sfp->read_wait, wait);
1154 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1155 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1156 /* if any read waiting, flag it */
1157 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1158 res = POLLIN | POLLRDNORM;
1159 ++count;
1160 }
1161 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1162
1163 if (atomic_read(&sdp->detaching))
1164 res |= POLLHUP;
1165 else if (!sfp->cmd_q) {
1166 if (0 == count)
1167 res |= POLLOUT | POLLWRNORM;
1168 } else if (count < SG_MAX_QUEUE)
1169 res |= POLLOUT | POLLWRNORM;
1170 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1171 "sg_poll: res=0x%x\n", (int) res));
1172 return res;
1173 }
1174
1175 static int
1176 sg_fasync(int fd, struct file *filp, int mode)
1177 {
1178 Sg_device *sdp;
1179 Sg_fd *sfp;
1180
1181 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1182 return -ENXIO;
1183 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1184 "sg_fasync: mode=%d\n", mode));
1185
1186 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1187 }
1188
1189 static int
1190 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1191 {
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_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 kref_put(&sfp->f_ref, sg_remove_sfp);
1272 }
1273
1274 /*
1275 * This function is a "bottom half" handler that is called by the mid
1276 * level when a command is completed (or has failed).
1277 */
1278 static void
1279 sg_rq_end_io(struct request *rq, int uptodate)
1280 {
1281 struct sg_request *srp = rq->end_io_data;
1282 Sg_device *sdp;
1283 Sg_fd *sfp;
1284 unsigned long iflags;
1285 unsigned int ms;
1286 char *sense;
1287 int result, resid, done = 1;
1288
1289 if (WARN_ON(srp->done != 0))
1290 return;
1291
1292 sfp = srp->parentfp;
1293 if (WARN_ON(sfp == NULL))
1294 return;
1295
1296 sdp = sfp->parentdp;
1297 if (unlikely(atomic_read(&sdp->detaching)))
1298 pr_info("%s: device detaching\n", __func__);
1299
1300 sense = rq->sense;
1301 result = rq->errors;
1302 resid = rq->resid_len;
1303
1304 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1305 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1306 srp->header.pack_id, result));
1307 srp->header.resid = resid;
1308 ms = jiffies_to_msecs(jiffies);
1309 srp->header.duration = (ms > srp->header.duration) ?
1310 (ms - srp->header.duration) : 0;
1311 if (0 != result) {
1312 struct scsi_sense_hdr sshdr;
1313
1314 srp->header.status = 0xff & result;
1315 srp->header.masked_status = status_byte(result);
1316 srp->header.msg_status = msg_byte(result);
1317 srp->header.host_status = host_byte(result);
1318 srp->header.driver_status = driver_byte(result);
1319 if ((sdp->sgdebug > 0) &&
1320 ((CHECK_CONDITION == srp->header.masked_status) ||
1321 (COMMAND_TERMINATED == srp->header.masked_status)))
1322 __scsi_print_sense(sdp->device, __func__, sense,
1323 SCSI_SENSE_BUFFERSIZE);
1324
1325 /* Following if statement is a patch supplied by Eric Youngdale */
1326 if (driver_byte(result) != 0
1327 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1328 && !scsi_sense_is_deferred(&sshdr)
1329 && sshdr.sense_key == UNIT_ATTENTION
1330 && sdp->device->removable) {
1331 /* Detected possible disc change. Set the bit - this */
1332 /* may be used if there are filesystems using this device */
1333 sdp->device->changed = 1;
1334 }
1335 }
1336 /* Rely on write phase to clean out srp status values, so no "else" */
1337
1338 /*
1339 * Free the request as soon as it is complete so that its resources
1340 * can be reused without waiting for userspace to read() the
1341 * result. But keep the associated bio (if any) around until
1342 * blk_rq_unmap_user() can be called from user context.
1343 */
1344 srp->rq = NULL;
1345 if (rq->cmd != rq->__cmd)
1346 kfree(rq->cmd);
1347 __blk_put_request(rq->q, rq);
1348
1349 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1350 if (unlikely(srp->orphan)) {
1351 if (sfp->keep_orphan)
1352 srp->sg_io_owned = 0;
1353 else
1354 done = 0;
1355 }
1356 srp->done = done;
1357 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1358
1359 if (likely(done)) {
1360 /* Now wake up any sg_read() that is waiting for this
1361 * packet.
1362 */
1363 wake_up_interruptible(&sfp->read_wait);
1364 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1365 kref_put(&sfp->f_ref, sg_remove_sfp);
1366 } else {
1367 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1368 schedule_work(&srp->ew.work);
1369 }
1370 }
1371
1372 static const struct file_operations sg_fops = {
1373 .owner = THIS_MODULE,
1374 .read = sg_read,
1375 .write = sg_write,
1376 .poll = sg_poll,
1377 .unlocked_ioctl = sg_ioctl,
1378 #ifdef CONFIG_COMPAT
1379 .compat_ioctl = sg_compat_ioctl,
1380 #endif
1381 .open = sg_open,
1382 .mmap = sg_mmap,
1383 .release = sg_release,
1384 .fasync = sg_fasync,
1385 .llseek = no_llseek,
1386 };
1387
1388 static struct class *sg_sysfs_class;
1389
1390 static int sg_sysfs_valid = 0;
1391
1392 static Sg_device *
1393 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1394 {
1395 struct request_queue *q = scsidp->request_queue;
1396 Sg_device *sdp;
1397 unsigned long iflags;
1398 int error;
1399 u32 k;
1400
1401 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1402 if (!sdp) {
1403 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1404 "failure\n", __func__);
1405 return ERR_PTR(-ENOMEM);
1406 }
1407
1408 idr_preload(GFP_KERNEL);
1409 write_lock_irqsave(&sg_index_lock, iflags);
1410
1411 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1412 if (error < 0) {
1413 if (error == -ENOSPC) {
1414 sdev_printk(KERN_WARNING, scsidp,
1415 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1416 scsidp->type, SG_MAX_DEVS - 1);
1417 error = -ENODEV;
1418 } else {
1419 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1420 "allocation Sg_device failure: %d\n",
1421 __func__, error);
1422 }
1423 goto out_unlock;
1424 }
1425 k = error;
1426
1427 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1428 "sg_alloc: dev=%d \n", k));
1429 sprintf(disk->disk_name, "sg%d", k);
1430 disk->first_minor = k;
1431 sdp->disk = disk;
1432 sdp->device = scsidp;
1433 mutex_init(&sdp->open_rel_lock);
1434 INIT_LIST_HEAD(&sdp->sfds);
1435 init_waitqueue_head(&sdp->open_wait);
1436 atomic_set(&sdp->detaching, 0);
1437 rwlock_init(&sdp->sfd_lock);
1438 sdp->sg_tablesize = queue_max_segments(q);
1439 sdp->index = k;
1440 kref_init(&sdp->d_ref);
1441 error = 0;
1442
1443 out_unlock:
1444 write_unlock_irqrestore(&sg_index_lock, iflags);
1445 idr_preload_end();
1446
1447 if (error) {
1448 kfree(sdp);
1449 return ERR_PTR(error);
1450 }
1451 return sdp;
1452 }
1453
1454 static int
1455 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1456 {
1457 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1458 struct gendisk *disk;
1459 Sg_device *sdp = NULL;
1460 struct cdev * cdev = NULL;
1461 int error;
1462 unsigned long iflags;
1463
1464 disk = alloc_disk(1);
1465 if (!disk) {
1466 pr_warn("%s: alloc_disk failed\n", __func__);
1467 return -ENOMEM;
1468 }
1469 disk->major = SCSI_GENERIC_MAJOR;
1470
1471 error = -ENOMEM;
1472 cdev = cdev_alloc();
1473 if (!cdev) {
1474 pr_warn("%s: cdev_alloc failed\n", __func__);
1475 goto out;
1476 }
1477 cdev->owner = THIS_MODULE;
1478 cdev->ops = &sg_fops;
1479
1480 sdp = sg_alloc(disk, scsidp);
1481 if (IS_ERR(sdp)) {
1482 pr_warn("%s: sg_alloc failed\n", __func__);
1483 error = PTR_ERR(sdp);
1484 goto out;
1485 }
1486
1487 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1488 if (error)
1489 goto cdev_add_err;
1490
1491 sdp->cdev = cdev;
1492 if (sg_sysfs_valid) {
1493 struct device *sg_class_member;
1494
1495 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1496 MKDEV(SCSI_GENERIC_MAJOR,
1497 sdp->index),
1498 sdp, "%s", disk->disk_name);
1499 if (IS_ERR(sg_class_member)) {
1500 pr_err("%s: device_create failed\n", __func__);
1501 error = PTR_ERR(sg_class_member);
1502 goto cdev_add_err;
1503 }
1504 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1505 &sg_class_member->kobj, "generic");
1506 if (error)
1507 pr_err("%s: unable to make symlink 'generic' back "
1508 "to sg%d\n", __func__, sdp->index);
1509 } else
1510 pr_warn("%s: sg_sys Invalid\n", __func__);
1511
1512 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1513 "type %d\n", sdp->index, scsidp->type);
1514
1515 dev_set_drvdata(cl_dev, sdp);
1516
1517 return 0;
1518
1519 cdev_add_err:
1520 write_lock_irqsave(&sg_index_lock, iflags);
1521 idr_remove(&sg_index_idr, sdp->index);
1522 write_unlock_irqrestore(&sg_index_lock, iflags);
1523 kfree(sdp);
1524
1525 out:
1526 put_disk(disk);
1527 if (cdev)
1528 cdev_del(cdev);
1529 return error;
1530 }
1531
1532 static void
1533 sg_device_destroy(struct kref *kref)
1534 {
1535 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1536 unsigned long flags;
1537
1538 /* CAUTION! Note that the device can still be found via idr_find()
1539 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1540 * any other cleanup.
1541 */
1542
1543 write_lock_irqsave(&sg_index_lock, flags);
1544 idr_remove(&sg_index_idr, sdp->index);
1545 write_unlock_irqrestore(&sg_index_lock, flags);
1546
1547 SCSI_LOG_TIMEOUT(3,
1548 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
1549
1550 put_disk(sdp->disk);
1551 kfree(sdp);
1552 }
1553
1554 static void
1555 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1556 {
1557 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1558 Sg_device *sdp = dev_get_drvdata(cl_dev);
1559 unsigned long iflags;
1560 Sg_fd *sfp;
1561 int val;
1562
1563 if (!sdp)
1564 return;
1565 /* want sdp->detaching non-zero as soon as possible */
1566 val = atomic_inc_return(&sdp->detaching);
1567 if (val > 1)
1568 return; /* only want to do following once per device */
1569
1570 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1571 "%s\n", __func__));
1572
1573 read_lock_irqsave(&sdp->sfd_lock, iflags);
1574 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1575 wake_up_interruptible_all(&sfp->read_wait);
1576 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1577 }
1578 wake_up_interruptible_all(&sdp->open_wait);
1579 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1580
1581 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1582 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1583 cdev_del(sdp->cdev);
1584 sdp->cdev = NULL;
1585
1586 kref_put(&sdp->d_ref, sg_device_destroy);
1587 }
1588
1589 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1590 module_param_named(def_reserved_size, def_reserved_size, int,
1591 S_IRUGO | S_IWUSR);
1592 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1593
1594 MODULE_AUTHOR("Douglas Gilbert");
1595 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1596 MODULE_LICENSE("GPL");
1597 MODULE_VERSION(SG_VERSION_STR);
1598 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1599
1600 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1601 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1602 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1603 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1604
1605 static int __init
1606 init_sg(void)
1607 {
1608 int rc;
1609
1610 if (scatter_elem_sz < PAGE_SIZE) {
1611 scatter_elem_sz = PAGE_SIZE;
1612 scatter_elem_sz_prev = scatter_elem_sz;
1613 }
1614 if (def_reserved_size >= 0)
1615 sg_big_buff = def_reserved_size;
1616 else
1617 def_reserved_size = sg_big_buff;
1618
1619 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1620 SG_MAX_DEVS, "sg");
1621 if (rc)
1622 return rc;
1623 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1624 if ( IS_ERR(sg_sysfs_class) ) {
1625 rc = PTR_ERR(sg_sysfs_class);
1626 goto err_out;
1627 }
1628 sg_sysfs_valid = 1;
1629 rc = scsi_register_interface(&sg_interface);
1630 if (0 == rc) {
1631 #ifdef CONFIG_SCSI_PROC_FS
1632 sg_proc_init();
1633 #endif /* CONFIG_SCSI_PROC_FS */
1634 return 0;
1635 }
1636 class_destroy(sg_sysfs_class);
1637 err_out:
1638 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1639 return rc;
1640 }
1641
1642 static void __exit
1643 exit_sg(void)
1644 {
1645 #ifdef CONFIG_SCSI_PROC_FS
1646 sg_proc_cleanup();
1647 #endif /* CONFIG_SCSI_PROC_FS */
1648 scsi_unregister_interface(&sg_interface);
1649 class_destroy(sg_sysfs_class);
1650 sg_sysfs_valid = 0;
1651 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1652 SG_MAX_DEVS);
1653 idr_destroy(&sg_index_idr);
1654 }
1655
1656 static int
1657 sg_start_req(Sg_request *srp, unsigned char *cmd)
1658 {
1659 int res;
1660 struct request *rq;
1661 Sg_fd *sfp = srp->parentfp;
1662 sg_io_hdr_t *hp = &srp->header;
1663 int dxfer_len = (int) hp->dxfer_len;
1664 int dxfer_dir = hp->dxfer_direction;
1665 unsigned int iov_count = hp->iovec_count;
1666 Sg_scatter_hold *req_schp = &srp->data;
1667 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1668 struct request_queue *q = sfp->parentdp->device->request_queue;
1669 struct rq_map_data *md, map_data;
1670 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1671 unsigned char *long_cmdp = NULL;
1672
1673 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1674 "sg_start_req: dxfer_len=%d\n",
1675 dxfer_len));
1676
1677 if (hp->cmd_len > BLK_MAX_CDB) {
1678 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1679 if (!long_cmdp)
1680 return -ENOMEM;
1681 }
1682
1683 /*
1684 * NOTE
1685 *
1686 * With scsi-mq enabled, there are a fixed number of preallocated
1687 * requests equal in number to shost->can_queue. If all of the
1688 * preallocated requests are already in use, then using GFP_ATOMIC with
1689 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1690 * will cause blk_get_request() to sleep until an active command
1691 * completes, freeing up a request. Neither option is ideal, but
1692 * GFP_KERNEL is the better choice to prevent userspace from getting an
1693 * unexpected EWOULDBLOCK.
1694 *
1695 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1696 * does not sleep except under memory pressure.
1697 */
1698 rq = blk_get_request(q, rw, GFP_KERNEL);
1699 if (IS_ERR(rq)) {
1700 kfree(long_cmdp);
1701 return PTR_ERR(rq);
1702 }
1703
1704 blk_rq_set_block_pc(rq);
1705
1706 if (hp->cmd_len > BLK_MAX_CDB)
1707 rq->cmd = long_cmdp;
1708 memcpy(rq->cmd, cmd, hp->cmd_len);
1709 rq->cmd_len = hp->cmd_len;
1710
1711 srp->rq = rq;
1712 rq->end_io_data = srp;
1713 rq->sense = srp->sense_b;
1714 rq->retries = SG_DEFAULT_RETRIES;
1715
1716 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1717 return 0;
1718
1719 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1720 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1721 !sfp->parentdp->device->host->unchecked_isa_dma &&
1722 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1723 md = NULL;
1724 else
1725 md = &map_data;
1726
1727 if (md) {
1728 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1729 sg_link_reserve(sfp, srp, dxfer_len);
1730 else {
1731 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1732 if (res)
1733 return res;
1734 }
1735
1736 md->pages = req_schp->pages;
1737 md->page_order = req_schp->page_order;
1738 md->nr_entries = req_schp->k_use_sg;
1739 md->offset = 0;
1740 md->null_mapped = hp->dxferp ? 0 : 1;
1741 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1742 md->from_user = 1;
1743 else
1744 md->from_user = 0;
1745 }
1746
1747 if (iov_count) {
1748 int len, size = sizeof(struct sg_iovec) * iov_count;
1749 struct iovec *iov;
1750
1751 iov = memdup_user(hp->dxferp, size);
1752 if (IS_ERR(iov))
1753 return PTR_ERR(iov);
1754
1755 len = iov_length(iov, iov_count);
1756 if (hp->dxfer_len < len) {
1757 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1758 len = hp->dxfer_len;
1759 }
1760
1761 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1762 iov_count,
1763 len, GFP_ATOMIC);
1764 kfree(iov);
1765 } else
1766 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1767 hp->dxfer_len, GFP_ATOMIC);
1768
1769 if (!res) {
1770 srp->bio = rq->bio;
1771
1772 if (!md) {
1773 req_schp->dio_in_use = 1;
1774 hp->info |= SG_INFO_DIRECT_IO;
1775 }
1776 }
1777 return res;
1778 }
1779
1780 static int
1781 sg_finish_rem_req(Sg_request *srp)
1782 {
1783 int ret = 0;
1784
1785 Sg_fd *sfp = srp->parentfp;
1786 Sg_scatter_hold *req_schp = &srp->data;
1787
1788 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1789 "sg_finish_rem_req: res_used=%d\n",
1790 (int) srp->res_used));
1791 if (srp->bio)
1792 ret = blk_rq_unmap_user(srp->bio);
1793
1794 if (srp->rq) {
1795 if (srp->rq->cmd != srp->rq->__cmd)
1796 kfree(srp->rq->cmd);
1797 blk_put_request(srp->rq);
1798 }
1799
1800 if (srp->res_used)
1801 sg_unlink_reserve(sfp, srp);
1802 else
1803 sg_remove_scat(sfp, req_schp);
1804
1805 sg_remove_request(sfp, srp);
1806
1807 return ret;
1808 }
1809
1810 static int
1811 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1812 {
1813 int sg_bufflen = tablesize * sizeof(struct page *);
1814 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1815
1816 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1817 if (!schp->pages)
1818 return -ENOMEM;
1819 schp->sglist_len = sg_bufflen;
1820 return tablesize; /* number of scat_gath elements allocated */
1821 }
1822
1823 static int
1824 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1825 {
1826 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1827 int sg_tablesize = sfp->parentdp->sg_tablesize;
1828 int blk_size = buff_size, order;
1829 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1830
1831 if (blk_size < 0)
1832 return -EFAULT;
1833 if (0 == blk_size)
1834 ++blk_size; /* don't know why */
1835 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1836 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1837 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1838 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1839 buff_size, blk_size));
1840
1841 /* N.B. ret_sz carried into this block ... */
1842 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1843 if (mx_sc_elems < 0)
1844 return mx_sc_elems; /* most likely -ENOMEM */
1845
1846 num = scatter_elem_sz;
1847 if (unlikely(num != scatter_elem_sz_prev)) {
1848 if (num < PAGE_SIZE) {
1849 scatter_elem_sz = PAGE_SIZE;
1850 scatter_elem_sz_prev = PAGE_SIZE;
1851 } else
1852 scatter_elem_sz_prev = num;
1853 }
1854
1855 if (sfp->low_dma)
1856 gfp_mask |= GFP_DMA;
1857
1858 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1859 gfp_mask |= __GFP_ZERO;
1860
1861 order = get_order(num);
1862 retry:
1863 ret_sz = 1 << (PAGE_SHIFT + order);
1864
1865 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1866 k++, rem_sz -= ret_sz) {
1867
1868 num = (rem_sz > scatter_elem_sz_prev) ?
1869 scatter_elem_sz_prev : rem_sz;
1870
1871 schp->pages[k] = alloc_pages(gfp_mask, order);
1872 if (!schp->pages[k])
1873 goto out;
1874
1875 if (num == scatter_elem_sz_prev) {
1876 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1877 scatter_elem_sz = ret_sz;
1878 scatter_elem_sz_prev = ret_sz;
1879 }
1880 }
1881
1882 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1883 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1884 k, num, ret_sz));
1885 } /* end of for loop */
1886
1887 schp->page_order = order;
1888 schp->k_use_sg = k;
1889 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1890 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1891 k, rem_sz));
1892
1893 schp->bufflen = blk_size;
1894 if (rem_sz > 0) /* must have failed */
1895 return -ENOMEM;
1896 return 0;
1897 out:
1898 for (i = 0; i < k; i++)
1899 __free_pages(schp->pages[i], order);
1900
1901 if (--order >= 0)
1902 goto retry;
1903
1904 return -ENOMEM;
1905 }
1906
1907 static void
1908 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1909 {
1910 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1911 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1912 if (schp->pages && schp->sglist_len > 0) {
1913 if (!schp->dio_in_use) {
1914 int k;
1915
1916 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1917 SCSI_LOG_TIMEOUT(5,
1918 sg_printk(KERN_INFO, sfp->parentdp,
1919 "sg_remove_scat: k=%d, pg=0x%p\n",
1920 k, schp->pages[k]));
1921 __free_pages(schp->pages[k], schp->page_order);
1922 }
1923
1924 kfree(schp->pages);
1925 }
1926 }
1927 memset(schp, 0, sizeof (*schp));
1928 }
1929
1930 static int
1931 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1932 {
1933 Sg_scatter_hold *schp = &srp->data;
1934 int k, num;
1935
1936 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1937 "sg_read_oxfer: num_read_xfer=%d\n",
1938 num_read_xfer));
1939 if ((!outp) || (num_read_xfer <= 0))
1940 return 0;
1941
1942 num = 1 << (PAGE_SHIFT + schp->page_order);
1943 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1944 if (num > num_read_xfer) {
1945 if (__copy_to_user(outp, page_address(schp->pages[k]),
1946 num_read_xfer))
1947 return -EFAULT;
1948 break;
1949 } else {
1950 if (__copy_to_user(outp, page_address(schp->pages[k]),
1951 num))
1952 return -EFAULT;
1953 num_read_xfer -= num;
1954 if (num_read_xfer <= 0)
1955 break;
1956 outp += num;
1957 }
1958 }
1959
1960 return 0;
1961 }
1962
1963 static void
1964 sg_build_reserve(Sg_fd * sfp, int req_size)
1965 {
1966 Sg_scatter_hold *schp = &sfp->reserve;
1967
1968 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1969 "sg_build_reserve: req_size=%d\n", req_size));
1970 do {
1971 if (req_size < PAGE_SIZE)
1972 req_size = PAGE_SIZE;
1973 if (0 == sg_build_indirect(schp, sfp, req_size))
1974 return;
1975 else
1976 sg_remove_scat(sfp, schp);
1977 req_size >>= 1; /* divide by 2 */
1978 } while (req_size > (PAGE_SIZE / 2));
1979 }
1980
1981 static void
1982 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1983 {
1984 Sg_scatter_hold *req_schp = &srp->data;
1985 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1986 int k, num, rem;
1987
1988 srp->res_used = 1;
1989 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1990 "sg_link_reserve: size=%d\n", size));
1991 rem = size;
1992
1993 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1994 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1995 if (rem <= num) {
1996 req_schp->k_use_sg = k + 1;
1997 req_schp->sglist_len = rsv_schp->sglist_len;
1998 req_schp->pages = rsv_schp->pages;
1999
2000 req_schp->bufflen = size;
2001 req_schp->page_order = rsv_schp->page_order;
2002 break;
2003 } else
2004 rem -= num;
2005 }
2006
2007 if (k >= rsv_schp->k_use_sg)
2008 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2009 "sg_link_reserve: BAD size\n"));
2010 }
2011
2012 static void
2013 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2014 {
2015 Sg_scatter_hold *req_schp = &srp->data;
2016
2017 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2018 "sg_unlink_reserve: req->k_use_sg=%d\n",
2019 (int) req_schp->k_use_sg));
2020 req_schp->k_use_sg = 0;
2021 req_schp->bufflen = 0;
2022 req_schp->pages = NULL;
2023 req_schp->page_order = 0;
2024 req_schp->sglist_len = 0;
2025 sfp->save_scat_len = 0;
2026 srp->res_used = 0;
2027 }
2028
2029 static Sg_request *
2030 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2031 {
2032 Sg_request *resp;
2033 unsigned long iflags;
2034
2035 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2036 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2037 /* look for requests that are ready + not SG_IO owned */
2038 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2039 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2040 resp->done = 2; /* guard against other readers */
2041 break;
2042 }
2043 }
2044 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2045 return resp;
2046 }
2047
2048 /* always adds to end of list */
2049 static Sg_request *
2050 sg_add_request(Sg_fd * sfp)
2051 {
2052 int k;
2053 unsigned long iflags;
2054 Sg_request *resp;
2055 Sg_request *rp = sfp->req_arr;
2056
2057 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2058 resp = sfp->headrp;
2059 if (!resp) {
2060 memset(rp, 0, sizeof (Sg_request));
2061 rp->parentfp = sfp;
2062 resp = rp;
2063 sfp->headrp = resp;
2064 } else {
2065 if (0 == sfp->cmd_q)
2066 resp = NULL; /* command queuing disallowed */
2067 else {
2068 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2069 if (!rp->parentfp)
2070 break;
2071 }
2072 if (k < SG_MAX_QUEUE) {
2073 memset(rp, 0, sizeof (Sg_request));
2074 rp->parentfp = sfp;
2075 while (resp->nextrp)
2076 resp = resp->nextrp;
2077 resp->nextrp = rp;
2078 resp = rp;
2079 } else
2080 resp = NULL;
2081 }
2082 }
2083 if (resp) {
2084 resp->nextrp = NULL;
2085 resp->header.duration = jiffies_to_msecs(jiffies);
2086 }
2087 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2088 return resp;
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 Sg_request *prev_rp;
2096 Sg_request *rp;
2097 unsigned long iflags;
2098 int res = 0;
2099
2100 if ((!sfp) || (!srp) || (!sfp->headrp))
2101 return res;
2102 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2103 prev_rp = sfp->headrp;
2104 if (srp == prev_rp) {
2105 sfp->headrp = prev_rp->nextrp;
2106 prev_rp->parentfp = NULL;
2107 res = 1;
2108 } else {
2109 while ((rp = prev_rp->nextrp)) {
2110 if (srp == rp) {
2111 prev_rp->nextrp = rp->nextrp;
2112 rp->parentfp = NULL;
2113 res = 1;
2114 break;
2115 }
2116 prev_rp = rp;
2117 }
2118 }
2119 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2120 return res;
2121 }
2122
2123 static Sg_fd *
2124 sg_add_sfp(Sg_device * sdp)
2125 {
2126 Sg_fd *sfp;
2127 unsigned long iflags;
2128 int bufflen;
2129
2130 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2131 if (!sfp)
2132 return ERR_PTR(-ENOMEM);
2133
2134 init_waitqueue_head(&sfp->read_wait);
2135 rwlock_init(&sfp->rq_list_lock);
2136
2137 kref_init(&sfp->f_ref);
2138 sfp->timeout = SG_DEFAULT_TIMEOUT;
2139 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2140 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2141 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2142 sdp->device->host->unchecked_isa_dma : 1;
2143 sfp->cmd_q = SG_DEF_COMMAND_Q;
2144 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2145 sfp->parentdp = sdp;
2146 write_lock_irqsave(&sdp->sfd_lock, iflags);
2147 if (atomic_read(&sdp->detaching)) {
2148 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2149 return ERR_PTR(-ENODEV);
2150 }
2151 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2152 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2153 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2154 "sg_add_sfp: sfp=0x%p\n", sfp));
2155 if (unlikely(sg_big_buff != def_reserved_size))
2156 sg_big_buff = def_reserved_size;
2157
2158 bufflen = min_t(int, sg_big_buff,
2159 max_sectors_bytes(sdp->device->request_queue));
2160 sg_build_reserve(sfp, bufflen);
2161 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2162 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2163 sfp->reserve.bufflen,
2164 sfp->reserve.k_use_sg));
2165
2166 kref_get(&sdp->d_ref);
2167 __module_get(THIS_MODULE);
2168 return sfp;
2169 }
2170
2171 static void
2172 sg_remove_sfp_usercontext(struct work_struct *work)
2173 {
2174 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2175 struct sg_device *sdp = sfp->parentdp;
2176
2177 /* Cleanup any responses which were never read(). */
2178 while (sfp->headrp)
2179 sg_finish_rem_req(sfp->headrp);
2180
2181 if (sfp->reserve.bufflen > 0) {
2182 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2183 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2184 (int) sfp->reserve.bufflen,
2185 (int) sfp->reserve.k_use_sg));
2186 sg_remove_scat(sfp, &sfp->reserve);
2187 }
2188
2189 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2190 "sg_remove_sfp: sfp=0x%p\n", sfp));
2191 kfree(sfp);
2192
2193 scsi_device_put(sdp->device);
2194 kref_put(&sdp->d_ref, sg_device_destroy);
2195 module_put(THIS_MODULE);
2196 }
2197
2198 static void
2199 sg_remove_sfp(struct kref *kref)
2200 {
2201 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2202 struct sg_device *sdp = sfp->parentdp;
2203 unsigned long iflags;
2204
2205 write_lock_irqsave(&sdp->sfd_lock, iflags);
2206 list_del(&sfp->sfd_siblings);
2207 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2208
2209 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2210 schedule_work(&sfp->ew.work);
2211 }
2212
2213 static int
2214 sg_res_in_use(Sg_fd * sfp)
2215 {
2216 const Sg_request *srp;
2217 unsigned long iflags;
2218
2219 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2220 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2221 if (srp->res_used)
2222 break;
2223 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2224 return srp ? 1 : 0;
2225 }
2226
2227 #ifdef CONFIG_SCSI_PROC_FS
2228 static int
2229 sg_idr_max_id(int id, void *p, void *data)
2230 {
2231 int *k = data;
2232
2233 if (*k < id)
2234 *k = id;
2235
2236 return 0;
2237 }
2238
2239 static int
2240 sg_last_dev(void)
2241 {
2242 int k = -1;
2243 unsigned long iflags;
2244
2245 read_lock_irqsave(&sg_index_lock, iflags);
2246 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2247 read_unlock_irqrestore(&sg_index_lock, iflags);
2248 return k + 1; /* origin 1 */
2249 }
2250 #endif
2251
2252 /* must be called with sg_index_lock held */
2253 static Sg_device *sg_lookup_dev(int dev)
2254 {
2255 return idr_find(&sg_index_idr, dev);
2256 }
2257
2258 static Sg_device *
2259 sg_get_dev(int dev)
2260 {
2261 struct sg_device *sdp;
2262 unsigned long flags;
2263
2264 read_lock_irqsave(&sg_index_lock, flags);
2265 sdp = sg_lookup_dev(dev);
2266 if (!sdp)
2267 sdp = ERR_PTR(-ENXIO);
2268 else if (atomic_read(&sdp->detaching)) {
2269 /* If sdp->detaching, then the refcount may already be 0, in
2270 * which case it would be a bug to do kref_get().
2271 */
2272 sdp = ERR_PTR(-ENODEV);
2273 } else
2274 kref_get(&sdp->d_ref);
2275 read_unlock_irqrestore(&sg_index_lock, flags);
2276
2277 return sdp;
2278 }
2279
2280 #ifdef CONFIG_SCSI_PROC_FS
2281
2282 static struct proc_dir_entry *sg_proc_sgp = NULL;
2283
2284 static char sg_proc_sg_dirname[] = "scsi/sg";
2285
2286 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2287
2288 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2289 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2290 size_t count, loff_t *off);
2291 static const struct file_operations adio_fops = {
2292 .owner = THIS_MODULE,
2293 .open = sg_proc_single_open_adio,
2294 .read = seq_read,
2295 .llseek = seq_lseek,
2296 .write = sg_proc_write_adio,
2297 .release = single_release,
2298 };
2299
2300 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2301 static ssize_t sg_proc_write_dressz(struct file *filp,
2302 const char __user *buffer, size_t count, loff_t *off);
2303 static const struct file_operations dressz_fops = {
2304 .owner = THIS_MODULE,
2305 .open = sg_proc_single_open_dressz,
2306 .read = seq_read,
2307 .llseek = seq_lseek,
2308 .write = sg_proc_write_dressz,
2309 .release = single_release,
2310 };
2311
2312 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2313 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2314 static const struct file_operations version_fops = {
2315 .owner = THIS_MODULE,
2316 .open = sg_proc_single_open_version,
2317 .read = seq_read,
2318 .llseek = seq_lseek,
2319 .release = single_release,
2320 };
2321
2322 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2323 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2324 static const struct file_operations devhdr_fops = {
2325 .owner = THIS_MODULE,
2326 .open = sg_proc_single_open_devhdr,
2327 .read = seq_read,
2328 .llseek = seq_lseek,
2329 .release = single_release,
2330 };
2331
2332 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2333 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2334 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2335 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2336 static void dev_seq_stop(struct seq_file *s, void *v);
2337 static const struct file_operations dev_fops = {
2338 .owner = THIS_MODULE,
2339 .open = sg_proc_open_dev,
2340 .read = seq_read,
2341 .llseek = seq_lseek,
2342 .release = seq_release,
2343 };
2344 static const struct seq_operations dev_seq_ops = {
2345 .start = dev_seq_start,
2346 .next = dev_seq_next,
2347 .stop = dev_seq_stop,
2348 .show = sg_proc_seq_show_dev,
2349 };
2350
2351 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2352 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2353 static const struct file_operations devstrs_fops = {
2354 .owner = THIS_MODULE,
2355 .open = sg_proc_open_devstrs,
2356 .read = seq_read,
2357 .llseek = seq_lseek,
2358 .release = seq_release,
2359 };
2360 static const struct seq_operations devstrs_seq_ops = {
2361 .start = dev_seq_start,
2362 .next = dev_seq_next,
2363 .stop = dev_seq_stop,
2364 .show = sg_proc_seq_show_devstrs,
2365 };
2366
2367 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2368 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2369 static const struct file_operations debug_fops = {
2370 .owner = THIS_MODULE,
2371 .open = sg_proc_open_debug,
2372 .read = seq_read,
2373 .llseek = seq_lseek,
2374 .release = seq_release,
2375 };
2376 static const struct seq_operations debug_seq_ops = {
2377 .start = dev_seq_start,
2378 .next = dev_seq_next,
2379 .stop = dev_seq_stop,
2380 .show = sg_proc_seq_show_debug,
2381 };
2382
2383
2384 struct sg_proc_leaf {
2385 const char * name;
2386 const struct file_operations * fops;
2387 };
2388
2389 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2390 {"allow_dio", &adio_fops},
2391 {"debug", &debug_fops},
2392 {"def_reserved_size", &dressz_fops},
2393 {"device_hdr", &devhdr_fops},
2394 {"devices", &dev_fops},
2395 {"device_strs", &devstrs_fops},
2396 {"version", &version_fops}
2397 };
2398
2399 static int
2400 sg_proc_init(void)
2401 {
2402 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2403 int k;
2404
2405 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2406 if (!sg_proc_sgp)
2407 return 1;
2408 for (k = 0; k < num_leaves; ++k) {
2409 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2410 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2411 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2412 }
2413 return 0;
2414 }
2415
2416 static void
2417 sg_proc_cleanup(void)
2418 {
2419 int k;
2420 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2421
2422 if (!sg_proc_sgp)
2423 return;
2424 for (k = 0; k < num_leaves; ++k)
2425 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2426 remove_proc_entry(sg_proc_sg_dirname, NULL);
2427 }
2428
2429
2430 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2431 {
2432 seq_printf(s, "%d\n", *((int *)s->private));
2433 return 0;
2434 }
2435
2436 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2437 {
2438 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2439 }
2440
2441 static ssize_t
2442 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2443 size_t count, loff_t *off)
2444 {
2445 int err;
2446 unsigned long num;
2447
2448 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2449 return -EACCES;
2450 err = kstrtoul_from_user(buffer, count, 0, &num);
2451 if (err)
2452 return err;
2453 sg_allow_dio = num ? 1 : 0;
2454 return count;
2455 }
2456
2457 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2458 {
2459 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2460 }
2461
2462 static ssize_t
2463 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2464 size_t count, loff_t *off)
2465 {
2466 int err;
2467 unsigned long k = ULONG_MAX;
2468
2469 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2470 return -EACCES;
2471
2472 err = kstrtoul_from_user(buffer, count, 0, &k);
2473 if (err)
2474 return err;
2475 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2476 sg_big_buff = k;
2477 return count;
2478 }
2479 return -ERANGE;
2480 }
2481
2482 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2483 {
2484 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2485 sg_version_date);
2486 return 0;
2487 }
2488
2489 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2490 {
2491 return single_open(file, sg_proc_seq_show_version, NULL);
2492 }
2493
2494 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2495 {
2496 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
2497 return 0;
2498 }
2499
2500 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2501 {
2502 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2503 }
2504
2505 struct sg_proc_deviter {
2506 loff_t index;
2507 size_t max;
2508 };
2509
2510 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2511 {
2512 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2513
2514 s->private = it;
2515 if (! it)
2516 return NULL;
2517
2518 it->index = *pos;
2519 it->max = sg_last_dev();
2520 if (it->index >= it->max)
2521 return NULL;
2522 return it;
2523 }
2524
2525 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2526 {
2527 struct sg_proc_deviter * it = s->private;
2528
2529 *pos = ++it->index;
2530 return (it->index < it->max) ? it : NULL;
2531 }
2532
2533 static void dev_seq_stop(struct seq_file *s, void *v)
2534 {
2535 kfree(s->private);
2536 }
2537
2538 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2539 {
2540 return seq_open(file, &dev_seq_ops);
2541 }
2542
2543 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2544 {
2545 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2546 Sg_device *sdp;
2547 struct scsi_device *scsidp;
2548 unsigned long iflags;
2549
2550 read_lock_irqsave(&sg_index_lock, iflags);
2551 sdp = it ? sg_lookup_dev(it->index) : NULL;
2552 if ((NULL == sdp) || (NULL == sdp->device) ||
2553 (atomic_read(&sdp->detaching)))
2554 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2555 else {
2556 scsidp = sdp->device;
2557 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
2558 scsidp->host->host_no, scsidp->channel,
2559 scsidp->id, scsidp->lun, (int) scsidp->type,
2560 1,
2561 (int) scsidp->queue_depth,
2562 (int) atomic_read(&scsidp->device_busy),
2563 (int) scsi_device_online(scsidp));
2564 }
2565 read_unlock_irqrestore(&sg_index_lock, iflags);
2566 return 0;
2567 }
2568
2569 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2570 {
2571 return seq_open(file, &devstrs_seq_ops);
2572 }
2573
2574 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2575 {
2576 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2577 Sg_device *sdp;
2578 struct scsi_device *scsidp;
2579 unsigned long iflags;
2580
2581 read_lock_irqsave(&sg_index_lock, iflags);
2582 sdp = it ? sg_lookup_dev(it->index) : NULL;
2583 scsidp = sdp ? sdp->device : NULL;
2584 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
2585 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2586 scsidp->vendor, scsidp->model, scsidp->rev);
2587 else
2588 seq_puts(s, "<no active device>\n");
2589 read_unlock_irqrestore(&sg_index_lock, iflags);
2590 return 0;
2591 }
2592
2593 /* must be called while holding sg_index_lock */
2594 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2595 {
2596 int k, m, new_interface, blen, usg;
2597 Sg_request *srp;
2598 Sg_fd *fp;
2599 const sg_io_hdr_t *hp;
2600 const char * cp;
2601 unsigned int ms;
2602
2603 k = 0;
2604 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2605 k++;
2606 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2607 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2608 "(res)sgat=%d low_dma=%d\n", k,
2609 jiffies_to_msecs(fp->timeout),
2610 fp->reserve.bufflen,
2611 (int) fp->reserve.k_use_sg,
2612 (int) fp->low_dma);
2613 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2614 (int) fp->cmd_q, (int) fp->force_packid,
2615 (int) fp->keep_orphan);
2616 for (m = 0, srp = fp->headrp;
2617 srp != NULL;
2618 ++m, srp = srp->nextrp) {
2619 hp = &srp->header;
2620 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2621 if (srp->res_used) {
2622 if (new_interface &&
2623 (SG_FLAG_MMAP_IO & hp->flags))
2624 cp = " mmap>> ";
2625 else
2626 cp = " rb>> ";
2627 } else {
2628 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2629 cp = " dio>> ";
2630 else
2631 cp = " ";
2632 }
2633 seq_puts(s, cp);
2634 blen = srp->data.bufflen;
2635 usg = srp->data.k_use_sg;
2636 seq_puts(s, srp->done ?
2637 ((1 == srp->done) ? "rcv:" : "fin:")
2638 : "act:");
2639 seq_printf(s, " id=%d blen=%d",
2640 srp->header.pack_id, blen);
2641 if (srp->done)
2642 seq_printf(s, " dur=%d", hp->duration);
2643 else {
2644 ms = jiffies_to_msecs(jiffies);
2645 seq_printf(s, " t_o/elap=%d/%d",
2646 (new_interface ? hp->timeout :
2647 jiffies_to_msecs(fp->timeout)),
2648 (ms > hp->duration ? ms - hp->duration : 0));
2649 }
2650 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2651 (int) srp->data.cmd_opcode);
2652 }
2653 if (0 == m)
2654 seq_puts(s, " No requests active\n");
2655 read_unlock(&fp->rq_list_lock);
2656 }
2657 }
2658
2659 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2660 {
2661 return seq_open(file, &debug_seq_ops);
2662 }
2663
2664 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2665 {
2666 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2667 Sg_device *sdp;
2668 unsigned long iflags;
2669
2670 if (it && (0 == it->index))
2671 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2672 (int)it->max, sg_big_buff);
2673
2674 read_lock_irqsave(&sg_index_lock, iflags);
2675 sdp = it ? sg_lookup_dev(it->index) : NULL;
2676 if (NULL == sdp)
2677 goto skip;
2678 read_lock(&sdp->sfd_lock);
2679 if (!list_empty(&sdp->sfds)) {
2680 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2681 if (atomic_read(&sdp->detaching))
2682 seq_puts(s, "detaching pending close ");
2683 else if (sdp->device) {
2684 struct scsi_device *scsidp = sdp->device;
2685
2686 seq_printf(s, "%d:%d:%d:%llu em=%d",
2687 scsidp->host->host_no,
2688 scsidp->channel, scsidp->id,
2689 scsidp->lun,
2690 scsidp->host->hostt->emulated);
2691 }
2692 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2693 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
2694 sg_proc_debug_helper(s, sdp);
2695 }
2696 read_unlock(&sdp->sfd_lock);
2697 skip:
2698 read_unlock_irqrestore(&sg_index_lock, iflags);
2699 return 0;
2700 }
2701
2702 #endif /* CONFIG_SCSI_PROC_FS */
2703
2704 module_init(init_sg);
2705 module_exit(exit_sg);
Linux kernel - Deliverables
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