projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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;
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 err = sg_finish_rem_req(srp);
579 return (0 == err) ? count : err;
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 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1339 if (unlikely(srp->orphan)) {
1340 if (sfp->keep_orphan)
1341 srp->sg_io_owned = 0;
1342 else
1343 done = 0;
1344 }
1345 srp->done = done;
1346 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1347
1348 if (likely(done)) {
1349 /* Now wake up any sg_read() that is waiting for this
1350 * packet.
1351 */
1352 wake_up_interruptible(&sfp->read_wait);
1353 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1354 kref_put(&sfp->f_ref, sg_remove_sfp);
1355 } else {
1356 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1357 schedule_work(&srp->ew.work);
1358 }
1359 }
1360
1361 static const struct file_operations sg_fops = {
1362 .owner = THIS_MODULE,
1363 .read = sg_read,
1364 .write = sg_write,
1365 .poll = sg_poll,
1366 .unlocked_ioctl = sg_ioctl,
1367 #ifdef CONFIG_COMPAT
1368 .compat_ioctl = sg_compat_ioctl,
1369 #endif
1370 .open = sg_open,
1371 .mmap = sg_mmap,
1372 .release = sg_release,
1373 .fasync = sg_fasync,
1374 .llseek = no_llseek,
1375 };
1376
1377 static struct class *sg_sysfs_class;
1378
1379 static int sg_sysfs_valid = 0;
1380
1381 static Sg_device *
1382 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1383 {
1384 struct request_queue *q = scsidp->request_queue;
1385 Sg_device *sdp;
1386 unsigned long iflags;
1387 int error;
1388 u32 k;
1389
1390 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1391 if (!sdp) {
1392 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1393 "failure\n", __func__);
1394 return ERR_PTR(-ENOMEM);
1395 }
1396
1397 idr_preload(GFP_KERNEL);
1398 write_lock_irqsave(&sg_index_lock, iflags);
1399
1400 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1401 if (error < 0) {
1402 if (error == -ENOSPC) {
1403 sdev_printk(KERN_WARNING, scsidp,
1404 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1405 scsidp->type, SG_MAX_DEVS - 1);
1406 error = -ENODEV;
1407 } else {
1408 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1409 "allocation Sg_device failure: %d\n",
1410 __func__, error);
1411 }
1412 goto out_unlock;
1413 }
1414 k = error;
1415
1416 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1417 "sg_alloc: dev=%d \n", k));
1418 sprintf(disk->disk_name, "sg%d", k);
1419 disk->first_minor = k;
1420 sdp->disk = disk;
1421 sdp->device = scsidp;
1422 mutex_init(&sdp->open_rel_lock);
1423 INIT_LIST_HEAD(&sdp->sfds);
1424 init_waitqueue_head(&sdp->open_wait);
1425 atomic_set(&sdp->detaching, 0);
1426 rwlock_init(&sdp->sfd_lock);
1427 sdp->sg_tablesize = queue_max_segments(q);
1428 sdp->index = k;
1429 kref_init(&sdp->d_ref);
1430 error = 0;
1431
1432 out_unlock:
1433 write_unlock_irqrestore(&sg_index_lock, iflags);
1434 idr_preload_end();
1435
1436 if (error) {
1437 kfree(sdp);
1438 return ERR_PTR(error);
1439 }
1440 return sdp;
1441 }
1442
1443 static int
1444 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1445 {
1446 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1447 struct gendisk *disk;
1448 Sg_device *sdp = NULL;
1449 struct cdev * cdev = NULL;
1450 int error;
1451 unsigned long iflags;
1452
1453 disk = alloc_disk(1);
1454 if (!disk) {
1455 pr_warn("%s: alloc_disk failed\n", __func__);
1456 return -ENOMEM;
1457 }
1458 disk->major = SCSI_GENERIC_MAJOR;
1459
1460 error = -ENOMEM;
1461 cdev = cdev_alloc();
1462 if (!cdev) {
1463 pr_warn("%s: cdev_alloc failed\n", __func__);
1464 goto out;
1465 }
1466 cdev->owner = THIS_MODULE;
1467 cdev->ops = &sg_fops;
1468
1469 sdp = sg_alloc(disk, scsidp);
1470 if (IS_ERR(sdp)) {
1471 pr_warn("%s: sg_alloc failed\n", __func__);
1472 error = PTR_ERR(sdp);
1473 goto out;
1474 }
1475
1476 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1477 if (error)
1478 goto cdev_add_err;
1479
1480 sdp->cdev = cdev;
1481 if (sg_sysfs_valid) {
1482 struct device *sg_class_member;
1483
1484 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1485 MKDEV(SCSI_GENERIC_MAJOR,
1486 sdp->index),
1487 sdp, "%s", disk->disk_name);
1488 if (IS_ERR(sg_class_member)) {
1489 pr_err("%s: device_create failed\n", __func__);
1490 error = PTR_ERR(sg_class_member);
1491 goto cdev_add_err;
1492 }
1493 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1494 &sg_class_member->kobj, "generic");
1495 if (error)
1496 pr_err("%s: unable to make symlink 'generic' back "
1497 "to sg%d\n", __func__, sdp->index);
1498 } else
1499 pr_warn("%s: sg_sys Invalid\n", __func__);
1500
1501 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1502 "type %d\n", sdp->index, scsidp->type);
1503
1504 dev_set_drvdata(cl_dev, sdp);
1505
1506 return 0;
1507
1508 cdev_add_err:
1509 write_lock_irqsave(&sg_index_lock, iflags);
1510 idr_remove(&sg_index_idr, sdp->index);
1511 write_unlock_irqrestore(&sg_index_lock, iflags);
1512 kfree(sdp);
1513
1514 out:
1515 put_disk(disk);
1516 if (cdev)
1517 cdev_del(cdev);
1518 return error;
1519 }
1520
1521 static void
1522 sg_device_destroy(struct kref *kref)
1523 {
1524 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1525 unsigned long flags;
1526
1527 /* CAUTION! Note that the device can still be found via idr_find()
1528 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1529 * any other cleanup.
1530 */
1531
1532 write_lock_irqsave(&sg_index_lock, flags);
1533 idr_remove(&sg_index_idr, sdp->index);
1534 write_unlock_irqrestore(&sg_index_lock, flags);
1535
1536 SCSI_LOG_TIMEOUT(3,
1537 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
1538
1539 put_disk(sdp->disk);
1540 kfree(sdp);
1541 }
1542
1543 static void
1544 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1545 {
1546 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1547 Sg_device *sdp = dev_get_drvdata(cl_dev);
1548 unsigned long iflags;
1549 Sg_fd *sfp;
1550 int val;
1551
1552 if (!sdp)
1553 return;
1554 /* want sdp->detaching non-zero as soon as possible */
1555 val = atomic_inc_return(&sdp->detaching);
1556 if (val > 1)
1557 return; /* only want to do following once per device */
1558
1559 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1560 "%s\n", __func__));
1561
1562 read_lock_irqsave(&sdp->sfd_lock, iflags);
1563 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1564 wake_up_interruptible_all(&sfp->read_wait);
1565 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1566 }
1567 wake_up_interruptible_all(&sdp->open_wait);
1568 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1569
1570 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1571 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1572 cdev_del(sdp->cdev);
1573 sdp->cdev = NULL;
1574
1575 kref_put(&sdp->d_ref, sg_device_destroy);
1576 }
1577
1578 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1579 module_param_named(def_reserved_size, def_reserved_size, int,
1580 S_IRUGO | S_IWUSR);
1581 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1582
1583 MODULE_AUTHOR("Douglas Gilbert");
1584 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1585 MODULE_LICENSE("GPL");
1586 MODULE_VERSION(SG_VERSION_STR);
1587 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1588
1589 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1590 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1591 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1592 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1593
1594 static int __init
1595 init_sg(void)
1596 {
1597 int rc;
1598
1599 if (scatter_elem_sz < PAGE_SIZE) {
1600 scatter_elem_sz = PAGE_SIZE;
1601 scatter_elem_sz_prev = scatter_elem_sz;
1602 }
1603 if (def_reserved_size >= 0)
1604 sg_big_buff = def_reserved_size;
1605 else
1606 def_reserved_size = sg_big_buff;
1607
1608 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1609 SG_MAX_DEVS, "sg");
1610 if (rc)
1611 return rc;
1612 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1613 if ( IS_ERR(sg_sysfs_class) ) {
1614 rc = PTR_ERR(sg_sysfs_class);
1615 goto err_out;
1616 }
1617 sg_sysfs_valid = 1;
1618 rc = scsi_register_interface(&sg_interface);
1619 if (0 == rc) {
1620 #ifdef CONFIG_SCSI_PROC_FS
1621 sg_proc_init();
1622 #endif /* CONFIG_SCSI_PROC_FS */
1623 return 0;
1624 }
1625 class_destroy(sg_sysfs_class);
1626 err_out:
1627 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1628 return rc;
1629 }
1630
1631 static void __exit
1632 exit_sg(void)
1633 {
1634 #ifdef CONFIG_SCSI_PROC_FS
1635 sg_proc_cleanup();
1636 #endif /* CONFIG_SCSI_PROC_FS */
1637 scsi_unregister_interface(&sg_interface);
1638 class_destroy(sg_sysfs_class);
1639 sg_sysfs_valid = 0;
1640 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1641 SG_MAX_DEVS);
1642 idr_destroy(&sg_index_idr);
1643 }
1644
1645 static int
1646 sg_start_req(Sg_request *srp, unsigned char *cmd)
1647 {
1648 int res;
1649 struct request *rq;
1650 Sg_fd *sfp = srp->parentfp;
1651 sg_io_hdr_t *hp = &srp->header;
1652 int dxfer_len = (int) hp->dxfer_len;
1653 int dxfer_dir = hp->dxfer_direction;
1654 unsigned int iov_count = hp->iovec_count;
1655 Sg_scatter_hold *req_schp = &srp->data;
1656 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1657 struct request_queue *q = sfp->parentdp->device->request_queue;
1658 struct rq_map_data *md, map_data;
1659 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1660 unsigned char *long_cmdp = NULL;
1661
1662 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1663 "sg_start_req: dxfer_len=%d\n",
1664 dxfer_len));
1665
1666 if (hp->cmd_len > BLK_MAX_CDB) {
1667 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1668 if (!long_cmdp)
1669 return -ENOMEM;
1670 }
1671
1672 rq = blk_get_request(q, rw, GFP_ATOMIC);
1673 if (IS_ERR(rq)) {
1674 kfree(long_cmdp);
1675 return PTR_ERR(rq);
1676 }
1677
1678 blk_rq_set_block_pc(rq);
1679
1680 if (hp->cmd_len > BLK_MAX_CDB)
1681 rq->cmd = long_cmdp;
1682 memcpy(rq->cmd, cmd, hp->cmd_len);
1683 rq->cmd_len = hp->cmd_len;
1684
1685 srp->rq = rq;
1686 rq->end_io_data = srp;
1687 rq->sense = srp->sense_b;
1688 rq->retries = SG_DEFAULT_RETRIES;
1689
1690 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1691 return 0;
1692
1693 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1694 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1695 !sfp->parentdp->device->host->unchecked_isa_dma &&
1696 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1697 md = NULL;
1698 else
1699 md = &map_data;
1700
1701 if (md) {
1702 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1703 sg_link_reserve(sfp, srp, dxfer_len);
1704 else {
1705 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1706 if (res)
1707 return res;
1708 }
1709
1710 md->pages = req_schp->pages;
1711 md->page_order = req_schp->page_order;
1712 md->nr_entries = req_schp->k_use_sg;
1713 md->offset = 0;
1714 md->null_mapped = hp->dxferp ? 0 : 1;
1715 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1716 md->from_user = 1;
1717 else
1718 md->from_user = 0;
1719 }
1720
1721 if (iov_count) {
1722 int size = sizeof(struct iovec) * iov_count;
1723 struct iovec *iov;
1724 struct iov_iter i;
1725
1726 iov = memdup_user(hp->dxferp, size);
1727 if (IS_ERR(iov))
1728 return PTR_ERR(iov);
1729
1730 iov_iter_init(&i, rw, iov, iov_count,
1731 min_t(size_t, hp->dxfer_len,
1732 iov_length(iov, iov_count)));
1733
1734 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
1735 kfree(iov);
1736 } else
1737 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1738 hp->dxfer_len, GFP_ATOMIC);
1739
1740 if (!res) {
1741 srp->bio = rq->bio;
1742
1743 if (!md) {
1744 req_schp->dio_in_use = 1;
1745 hp->info |= SG_INFO_DIRECT_IO;
1746 }
1747 }
1748 return res;
1749 }
1750
1751 static int
1752 sg_finish_rem_req(Sg_request *srp)
1753 {
1754 int ret = 0;
1755
1756 Sg_fd *sfp = srp->parentfp;
1757 Sg_scatter_hold *req_schp = &srp->data;
1758
1759 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1760 "sg_finish_rem_req: res_used=%d\n",
1761 (int) srp->res_used));
1762 if (srp->rq) {
1763 if (srp->bio)
1764 ret = blk_rq_unmap_user(srp->bio);
1765
1766 if (srp->rq->cmd != srp->rq->__cmd)
1767 kfree(srp->rq->cmd);
1768 blk_put_request(srp->rq);
1769 }
1770
1771 if (srp->res_used)
1772 sg_unlink_reserve(sfp, srp);
1773 else
1774 sg_remove_scat(sfp, req_schp);
1775
1776 sg_remove_request(sfp, srp);
1777
1778 return ret;
1779 }
1780
1781 static int
1782 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1783 {
1784 int sg_bufflen = tablesize * sizeof(struct page *);
1785 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1786
1787 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1788 if (!schp->pages)
1789 return -ENOMEM;
1790 schp->sglist_len = sg_bufflen;
1791 return tablesize; /* number of scat_gath elements allocated */
1792 }
1793
1794 static int
1795 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1796 {
1797 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1798 int sg_tablesize = sfp->parentdp->sg_tablesize;
1799 int blk_size = buff_size, order;
1800 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1801
1802 if (blk_size < 0)
1803 return -EFAULT;
1804 if (0 == blk_size)
1805 ++blk_size; /* don't know why */
1806 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1807 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1808 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1809 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1810 buff_size, blk_size));
1811
1812 /* N.B. ret_sz carried into this block ... */
1813 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1814 if (mx_sc_elems < 0)
1815 return mx_sc_elems; /* most likely -ENOMEM */
1816
1817 num = scatter_elem_sz;
1818 if (unlikely(num != scatter_elem_sz_prev)) {
1819 if (num < PAGE_SIZE) {
1820 scatter_elem_sz = PAGE_SIZE;
1821 scatter_elem_sz_prev = PAGE_SIZE;
1822 } else
1823 scatter_elem_sz_prev = num;
1824 }
1825
1826 if (sfp->low_dma)
1827 gfp_mask |= GFP_DMA;
1828
1829 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1830 gfp_mask |= __GFP_ZERO;
1831
1832 order = get_order(num);
1833 retry:
1834 ret_sz = 1 << (PAGE_SHIFT + order);
1835
1836 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1837 k++, rem_sz -= ret_sz) {
1838
1839 num = (rem_sz > scatter_elem_sz_prev) ?
1840 scatter_elem_sz_prev : rem_sz;
1841
1842 schp->pages[k] = alloc_pages(gfp_mask, order);
1843 if (!schp->pages[k])
1844 goto out;
1845
1846 if (num == scatter_elem_sz_prev) {
1847 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1848 scatter_elem_sz = ret_sz;
1849 scatter_elem_sz_prev = ret_sz;
1850 }
1851 }
1852
1853 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1854 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1855 k, num, ret_sz));
1856 } /* end of for loop */
1857
1858 schp->page_order = order;
1859 schp->k_use_sg = k;
1860 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1861 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1862 k, rem_sz));
1863
1864 schp->bufflen = blk_size;
1865 if (rem_sz > 0) /* must have failed */
1866 return -ENOMEM;
1867 return 0;
1868 out:
1869 for (i = 0; i < k; i++)
1870 __free_pages(schp->pages[i], order);
1871
1872 if (--order >= 0)
1873 goto retry;
1874
1875 return -ENOMEM;
1876 }
1877
1878 static void
1879 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1880 {
1881 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1882 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1883 if (schp->pages && schp->sglist_len > 0) {
1884 if (!schp->dio_in_use) {
1885 int k;
1886
1887 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1888 SCSI_LOG_TIMEOUT(5,
1889 sg_printk(KERN_INFO, sfp->parentdp,
1890 "sg_remove_scat: k=%d, pg=0x%p\n",
1891 k, schp->pages[k]));
1892 __free_pages(schp->pages[k], schp->page_order);
1893 }
1894
1895 kfree(schp->pages);
1896 }
1897 }
1898 memset(schp, 0, sizeof (*schp));
1899 }
1900
1901 static int
1902 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1903 {
1904 Sg_scatter_hold *schp = &srp->data;
1905 int k, num;
1906
1907 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1908 "sg_read_oxfer: num_read_xfer=%d\n",
1909 num_read_xfer));
1910 if ((!outp) || (num_read_xfer <= 0))
1911 return 0;
1912
1913 num = 1 << (PAGE_SHIFT + schp->page_order);
1914 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1915 if (num > num_read_xfer) {
1916 if (__copy_to_user(outp, page_address(schp->pages[k]),
1917 num_read_xfer))
1918 return -EFAULT;
1919 break;
1920 } else {
1921 if (__copy_to_user(outp, page_address(schp->pages[k]),
1922 num))
1923 return -EFAULT;
1924 num_read_xfer -= num;
1925 if (num_read_xfer <= 0)
1926 break;
1927 outp += num;
1928 }
1929 }
1930
1931 return 0;
1932 }
1933
1934 static void
1935 sg_build_reserve(Sg_fd * sfp, int req_size)
1936 {
1937 Sg_scatter_hold *schp = &sfp->reserve;
1938
1939 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1940 "sg_build_reserve: req_size=%d\n", req_size));
1941 do {
1942 if (req_size < PAGE_SIZE)
1943 req_size = PAGE_SIZE;
1944 if (0 == sg_build_indirect(schp, sfp, req_size))
1945 return;
1946 else
1947 sg_remove_scat(sfp, schp);
1948 req_size >>= 1; /* divide by 2 */
1949 } while (req_size > (PAGE_SIZE / 2));
1950 }
1951
1952 static void
1953 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1954 {
1955 Sg_scatter_hold *req_schp = &srp->data;
1956 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1957 int k, num, rem;
1958
1959 srp->res_used = 1;
1960 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1961 "sg_link_reserve: size=%d\n", size));
1962 rem = size;
1963
1964 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1965 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1966 if (rem <= num) {
1967 req_schp->k_use_sg = k + 1;
1968 req_schp->sglist_len = rsv_schp->sglist_len;
1969 req_schp->pages = rsv_schp->pages;
1970
1971 req_schp->bufflen = size;
1972 req_schp->page_order = rsv_schp->page_order;
1973 break;
1974 } else
1975 rem -= num;
1976 }
1977
1978 if (k >= rsv_schp->k_use_sg)
1979 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
1980 "sg_link_reserve: BAD size\n"));
1981 }
1982
1983 static void
1984 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1985 {
1986 Sg_scatter_hold *req_schp = &srp->data;
1987
1988 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1989 "sg_unlink_reserve: req->k_use_sg=%d\n",
1990 (int) req_schp->k_use_sg));
1991 req_schp->k_use_sg = 0;
1992 req_schp->bufflen = 0;
1993 req_schp->pages = NULL;
1994 req_schp->page_order = 0;
1995 req_schp->sglist_len = 0;
1996 sfp->save_scat_len = 0;
1997 srp->res_used = 0;
1998 }
1999
2000 static Sg_request *
2001 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2002 {
2003 Sg_request *resp;
2004 unsigned long iflags;
2005
2006 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2007 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2008 /* look for requests that are ready + not SG_IO owned */
2009 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2010 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2011 resp->done = 2; /* guard against other readers */
2012 break;
2013 }
2014 }
2015 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2016 return resp;
2017 }
2018
2019 /* always adds to end of list */
2020 static Sg_request *
2021 sg_add_request(Sg_fd * sfp)
2022 {
2023 int k;
2024 unsigned long iflags;
2025 Sg_request *resp;
2026 Sg_request *rp = sfp->req_arr;
2027
2028 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2029 resp = sfp->headrp;
2030 if (!resp) {
2031 memset(rp, 0, sizeof (Sg_request));
2032 rp->parentfp = sfp;
2033 resp = rp;
2034 sfp->headrp = resp;
2035 } else {
2036 if (0 == sfp->cmd_q)
2037 resp = NULL; /* command queuing disallowed */
2038 else {
2039 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2040 if (!rp->parentfp)
2041 break;
2042 }
2043 if (k < SG_MAX_QUEUE) {
2044 memset(rp, 0, sizeof (Sg_request));
2045 rp->parentfp = sfp;
2046 while (resp->nextrp)
2047 resp = resp->nextrp;
2048 resp->nextrp = rp;
2049 resp = rp;
2050 } else
2051 resp = NULL;
2052 }
2053 }
2054 if (resp) {
2055 resp->nextrp = NULL;
2056 resp->header.duration = jiffies_to_msecs(jiffies);
2057 }
2058 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2059 return resp;
2060 }
2061
2062 /* Return of 1 for found; 0 for not found */
2063 static int
2064 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2065 {
2066 Sg_request *prev_rp;
2067 Sg_request *rp;
2068 unsigned long iflags;
2069 int res = 0;
2070
2071 if ((!sfp) || (!srp) || (!sfp->headrp))
2072 return res;
2073 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2074 prev_rp = sfp->headrp;
2075 if (srp == prev_rp) {
2076 sfp->headrp = prev_rp->nextrp;
2077 prev_rp->parentfp = NULL;
2078 res = 1;
2079 } else {
2080 while ((rp = prev_rp->nextrp)) {
2081 if (srp == rp) {
2082 prev_rp->nextrp = rp->nextrp;
2083 rp->parentfp = NULL;
2084 res = 1;
2085 break;
2086 }
2087 prev_rp = rp;
2088 }
2089 }
2090 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2091 return res;
2092 }
2093
2094 static Sg_fd *
2095 sg_add_sfp(Sg_device * sdp)
2096 {
2097 Sg_fd *sfp;
2098 unsigned long iflags;
2099 int bufflen;
2100
2101 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2102 if (!sfp)
2103 return ERR_PTR(-ENOMEM);
2104
2105 init_waitqueue_head(&sfp->read_wait);
2106 rwlock_init(&sfp->rq_list_lock);
2107
2108 kref_init(&sfp->f_ref);
2109 sfp->timeout = SG_DEFAULT_TIMEOUT;
2110 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2111 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2112 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2113 sdp->device->host->unchecked_isa_dma : 1;
2114 sfp->cmd_q = SG_DEF_COMMAND_Q;
2115 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2116 sfp->parentdp = sdp;
2117 write_lock_irqsave(&sdp->sfd_lock, iflags);
2118 if (atomic_read(&sdp->detaching)) {
2119 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2120 return ERR_PTR(-ENODEV);
2121 }
2122 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2123 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2124 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2125 "sg_add_sfp: sfp=0x%p\n", sfp));
2126 if (unlikely(sg_big_buff != def_reserved_size))
2127 sg_big_buff = def_reserved_size;
2128
2129 bufflen = min_t(int, sg_big_buff,
2130 max_sectors_bytes(sdp->device->request_queue));
2131 sg_build_reserve(sfp, bufflen);
2132 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2133 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2134 sfp->reserve.bufflen,
2135 sfp->reserve.k_use_sg));
2136
2137 kref_get(&sdp->d_ref);
2138 __module_get(THIS_MODULE);
2139 return sfp;
2140 }
2141
2142 static void
2143 sg_remove_sfp_usercontext(struct work_struct *work)
2144 {
2145 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2146 struct sg_device *sdp = sfp->parentdp;
2147
2148 /* Cleanup any responses which were never read(). */
2149 while (sfp->headrp)
2150 sg_finish_rem_req(sfp->headrp);
2151
2152 if (sfp->reserve.bufflen > 0) {
2153 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2154 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2155 (int) sfp->reserve.bufflen,
2156 (int) sfp->reserve.k_use_sg));
2157 sg_remove_scat(sfp, &sfp->reserve);
2158 }
2159
2160 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2161 "sg_remove_sfp: sfp=0x%p\n", sfp));
2162 kfree(sfp);
2163
2164 scsi_device_put(sdp->device);
2165 kref_put(&sdp->d_ref, sg_device_destroy);
2166 module_put(THIS_MODULE);
2167 }
2168
2169 static void
2170 sg_remove_sfp(struct kref *kref)
2171 {
2172 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2173 struct sg_device *sdp = sfp->parentdp;
2174 unsigned long iflags;
2175
2176 write_lock_irqsave(&sdp->sfd_lock, iflags);
2177 list_del(&sfp->sfd_siblings);
2178 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2179
2180 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2181 schedule_work(&sfp->ew.work);
2182 }
2183
2184 static int
2185 sg_res_in_use(Sg_fd * sfp)
2186 {
2187 const Sg_request *srp;
2188 unsigned long iflags;
2189
2190 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2191 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2192 if (srp->res_used)
2193 break;
2194 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2195 return srp ? 1 : 0;
2196 }
2197
2198 #ifdef CONFIG_SCSI_PROC_FS
2199 static int
2200 sg_idr_max_id(int id, void *p, void *data)
2201 {
2202 int *k = data;
2203
2204 if (*k < id)
2205 *k = id;
2206
2207 return 0;
2208 }
2209
2210 static int
2211 sg_last_dev(void)
2212 {
2213 int k = -1;
2214 unsigned long iflags;
2215
2216 read_lock_irqsave(&sg_index_lock, iflags);
2217 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2218 read_unlock_irqrestore(&sg_index_lock, iflags);
2219 return k + 1; /* origin 1 */
2220 }
2221 #endif
2222
2223 /* must be called with sg_index_lock held */
2224 static Sg_device *sg_lookup_dev(int dev)
2225 {
2226 return idr_find(&sg_index_idr, dev);
2227 }
2228
2229 static Sg_device *
2230 sg_get_dev(int dev)
2231 {
2232 struct sg_device *sdp;
2233 unsigned long flags;
2234
2235 read_lock_irqsave(&sg_index_lock, flags);
2236 sdp = sg_lookup_dev(dev);
2237 if (!sdp)
2238 sdp = ERR_PTR(-ENXIO);
2239 else if (atomic_read(&sdp->detaching)) {
2240 /* If sdp->detaching, then the refcount may already be 0, in
2241 * which case it would be a bug to do kref_get().
2242 */
2243 sdp = ERR_PTR(-ENODEV);
2244 } else
2245 kref_get(&sdp->d_ref);
2246 read_unlock_irqrestore(&sg_index_lock, flags);
2247
2248 return sdp;
2249 }
2250
2251 #ifdef CONFIG_SCSI_PROC_FS
2252
2253 static struct proc_dir_entry *sg_proc_sgp = NULL;
2254
2255 static char sg_proc_sg_dirname[] = "scsi/sg";
2256
2257 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2258
2259 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2260 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2261 size_t count, loff_t *off);
2262 static const struct file_operations adio_fops = {
2263 .owner = THIS_MODULE,
2264 .open = sg_proc_single_open_adio,
2265 .read = seq_read,
2266 .llseek = seq_lseek,
2267 .write = sg_proc_write_adio,
2268 .release = single_release,
2269 };
2270
2271 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2272 static ssize_t sg_proc_write_dressz(struct file *filp,
2273 const char __user *buffer, size_t count, loff_t *off);
2274 static const struct file_operations dressz_fops = {
2275 .owner = THIS_MODULE,
2276 .open = sg_proc_single_open_dressz,
2277 .read = seq_read,
2278 .llseek = seq_lseek,
2279 .write = sg_proc_write_dressz,
2280 .release = single_release,
2281 };
2282
2283 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2284 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2285 static const struct file_operations version_fops = {
2286 .owner = THIS_MODULE,
2287 .open = sg_proc_single_open_version,
2288 .read = seq_read,
2289 .llseek = seq_lseek,
2290 .release = single_release,
2291 };
2292
2293 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2294 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2295 static const struct file_operations devhdr_fops = {
2296 .owner = THIS_MODULE,
2297 .open = sg_proc_single_open_devhdr,
2298 .read = seq_read,
2299 .llseek = seq_lseek,
2300 .release = single_release,
2301 };
2302
2303 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2304 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2305 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2306 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2307 static void dev_seq_stop(struct seq_file *s, void *v);
2308 static const struct file_operations dev_fops = {
2309 .owner = THIS_MODULE,
2310 .open = sg_proc_open_dev,
2311 .read = seq_read,
2312 .llseek = seq_lseek,
2313 .release = seq_release,
2314 };
2315 static const struct seq_operations dev_seq_ops = {
2316 .start = dev_seq_start,
2317 .next = dev_seq_next,
2318 .stop = dev_seq_stop,
2319 .show = sg_proc_seq_show_dev,
2320 };
2321
2322 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2323 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2324 static const struct file_operations devstrs_fops = {
2325 .owner = THIS_MODULE,
2326 .open = sg_proc_open_devstrs,
2327 .read = seq_read,
2328 .llseek = seq_lseek,
2329 .release = seq_release,
2330 };
2331 static const struct seq_operations devstrs_seq_ops = {
2332 .start = dev_seq_start,
2333 .next = dev_seq_next,
2334 .stop = dev_seq_stop,
2335 .show = sg_proc_seq_show_devstrs,
2336 };
2337
2338 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2339 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2340 static const struct file_operations debug_fops = {
2341 .owner = THIS_MODULE,
2342 .open = sg_proc_open_debug,
2343 .read = seq_read,
2344 .llseek = seq_lseek,
2345 .release = seq_release,
2346 };
2347 static const struct seq_operations debug_seq_ops = {
2348 .start = dev_seq_start,
2349 .next = dev_seq_next,
2350 .stop = dev_seq_stop,
2351 .show = sg_proc_seq_show_debug,
2352 };
2353
2354
2355 struct sg_proc_leaf {
2356 const char * name;
2357 const struct file_operations * fops;
2358 };
2359
2360 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2361 {"allow_dio", &adio_fops},
2362 {"debug", &debug_fops},
2363 {"def_reserved_size", &dressz_fops},
2364 {"device_hdr", &devhdr_fops},
2365 {"devices", &dev_fops},
2366 {"device_strs", &devstrs_fops},
2367 {"version", &version_fops}
2368 };
2369
2370 static int
2371 sg_proc_init(void)
2372 {
2373 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2374 int k;
2375
2376 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2377 if (!sg_proc_sgp)
2378 return 1;
2379 for (k = 0; k < num_leaves; ++k) {
2380 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2381 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2382 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2383 }
2384 return 0;
2385 }
2386
2387 static void
2388 sg_proc_cleanup(void)
2389 {
2390 int k;
2391 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2392
2393 if (!sg_proc_sgp)
2394 return;
2395 for (k = 0; k < num_leaves; ++k)
2396 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2397 remove_proc_entry(sg_proc_sg_dirname, NULL);
2398 }
2399
2400
2401 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2402 {
2403 seq_printf(s, "%d\n", *((int *)s->private));
2404 return 0;
2405 }
2406
2407 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2408 {
2409 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2410 }
2411
2412 static ssize_t
2413 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2414 size_t count, loff_t *off)
2415 {
2416 int err;
2417 unsigned long num;
2418
2419 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2420 return -EACCES;
2421 err = kstrtoul_from_user(buffer, count, 0, &num);
2422 if (err)
2423 return err;
2424 sg_allow_dio = num ? 1 : 0;
2425 return count;
2426 }
2427
2428 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2429 {
2430 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2431 }
2432
2433 static ssize_t
2434 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2435 size_t count, loff_t *off)
2436 {
2437 int err;
2438 unsigned long k = ULONG_MAX;
2439
2440 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2441 return -EACCES;
2442
2443 err = kstrtoul_from_user(buffer, count, 0, &k);
2444 if (err)
2445 return err;
2446 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2447 sg_big_buff = k;
2448 return count;
2449 }
2450 return -ERANGE;
2451 }
2452
2453 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2454 {
2455 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2456 sg_version_date);
2457 return 0;
2458 }
2459
2460 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2461 {
2462 return single_open(file, sg_proc_seq_show_version, NULL);
2463 }
2464
2465 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2466 {
2467 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
2468 return 0;
2469 }
2470
2471 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2472 {
2473 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2474 }
2475
2476 struct sg_proc_deviter {
2477 loff_t index;
2478 size_t max;
2479 };
2480
2481 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2482 {
2483 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2484
2485 s->private = it;
2486 if (! it)
2487 return NULL;
2488
2489 it->index = *pos;
2490 it->max = sg_last_dev();
2491 if (it->index >= it->max)
2492 return NULL;
2493 return it;
2494 }
2495
2496 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2497 {
2498 struct sg_proc_deviter * it = s->private;
2499
2500 *pos = ++it->index;
2501 return (it->index < it->max) ? it : NULL;
2502 }
2503
2504 static void dev_seq_stop(struct seq_file *s, void *v)
2505 {
2506 kfree(s->private);
2507 }
2508
2509 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2510 {
2511 return seq_open(file, &dev_seq_ops);
2512 }
2513
2514 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2515 {
2516 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2517 Sg_device *sdp;
2518 struct scsi_device *scsidp;
2519 unsigned long iflags;
2520
2521 read_lock_irqsave(&sg_index_lock, iflags);
2522 sdp = it ? sg_lookup_dev(it->index) : NULL;
2523 if ((NULL == sdp) || (NULL == sdp->device) ||
2524 (atomic_read(&sdp->detaching)))
2525 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2526 else {
2527 scsidp = sdp->device;
2528 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
2529 scsidp->host->host_no, scsidp->channel,
2530 scsidp->id, scsidp->lun, (int) scsidp->type,
2531 1,
2532 (int) scsidp->queue_depth,
2533 (int) atomic_read(&scsidp->device_busy),
2534 (int) scsi_device_online(scsidp));
2535 }
2536 read_unlock_irqrestore(&sg_index_lock, iflags);
2537 return 0;
2538 }
2539
2540 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2541 {
2542 return seq_open(file, &devstrs_seq_ops);
2543 }
2544
2545 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2546 {
2547 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2548 Sg_device *sdp;
2549 struct scsi_device *scsidp;
2550 unsigned long iflags;
2551
2552 read_lock_irqsave(&sg_index_lock, iflags);
2553 sdp = it ? sg_lookup_dev(it->index) : NULL;
2554 scsidp = sdp ? sdp->device : NULL;
2555 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
2556 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2557 scsidp->vendor, scsidp->model, scsidp->rev);
2558 else
2559 seq_puts(s, "<no active device>\n");
2560 read_unlock_irqrestore(&sg_index_lock, iflags);
2561 return 0;
2562 }
2563
2564 /* must be called while holding sg_index_lock */
2565 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2566 {
2567 int k, m, new_interface, blen, usg;
2568 Sg_request *srp;
2569 Sg_fd *fp;
2570 const sg_io_hdr_t *hp;
2571 const char * cp;
2572 unsigned int ms;
2573
2574 k = 0;
2575 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2576 k++;
2577 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2578 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2579 "(res)sgat=%d low_dma=%d\n", k,
2580 jiffies_to_msecs(fp->timeout),
2581 fp->reserve.bufflen,
2582 (int) fp->reserve.k_use_sg,
2583 (int) fp->low_dma);
2584 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2585 (int) fp->cmd_q, (int) fp->force_packid,
2586 (int) fp->keep_orphan);
2587 for (m = 0, srp = fp->headrp;
2588 srp != NULL;
2589 ++m, srp = srp->nextrp) {
2590 hp = &srp->header;
2591 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2592 if (srp->res_used) {
2593 if (new_interface &&
2594 (SG_FLAG_MMAP_IO & hp->flags))
2595 cp = " mmap>> ";
2596 else
2597 cp = " rb>> ";
2598 } else {
2599 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2600 cp = " dio>> ";
2601 else
2602 cp = " ";
2603 }
2604 seq_puts(s, cp);
2605 blen = srp->data.bufflen;
2606 usg = srp->data.k_use_sg;
2607 seq_puts(s, srp->done ?
2608 ((1 == srp->done) ? "rcv:" : "fin:")
2609 : "act:");
2610 seq_printf(s, " id=%d blen=%d",
2611 srp->header.pack_id, blen);
2612 if (srp->done)
2613 seq_printf(s, " dur=%d", hp->duration);
2614 else {
2615 ms = jiffies_to_msecs(jiffies);
2616 seq_printf(s, " t_o/elap=%d/%d",
2617 (new_interface ? hp->timeout :
2618 jiffies_to_msecs(fp->timeout)),
2619 (ms > hp->duration ? ms - hp->duration : 0));
2620 }
2621 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2622 (int) srp->data.cmd_opcode);
2623 }
2624 if (0 == m)
2625 seq_puts(s, " No requests active\n");
2626 read_unlock(&fp->rq_list_lock);
2627 }
2628 }
2629
2630 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2631 {
2632 return seq_open(file, &debug_seq_ops);
2633 }
2634
2635 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2636 {
2637 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2638 Sg_device *sdp;
2639 unsigned long iflags;
2640
2641 if (it && (0 == it->index))
2642 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2643 (int)it->max, sg_big_buff);
2644
2645 read_lock_irqsave(&sg_index_lock, iflags);
2646 sdp = it ? sg_lookup_dev(it->index) : NULL;
2647 if (NULL == sdp)
2648 goto skip;
2649 read_lock(&sdp->sfd_lock);
2650 if (!list_empty(&sdp->sfds)) {
2651 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2652 if (atomic_read(&sdp->detaching))
2653 seq_puts(s, "detaching pending close ");
2654 else if (sdp->device) {
2655 struct scsi_device *scsidp = sdp->device;
2656
2657 seq_printf(s, "%d:%d:%d:%llu em=%d",
2658 scsidp->host->host_no,
2659 scsidp->channel, scsidp->id,
2660 scsidp->lun,
2661 scsidp->host->hostt->emulated);
2662 }
2663 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2664 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
2665 sg_proc_debug_helper(s, sdp);
2666 }
2667 read_unlock(&sdp->sfd_lock);
2668 skip:
2669 read_unlock_irqrestore(&sg_index_lock, iflags);
2670 return 0;
2671 }
2672
2673 #endif /* CONFIG_SCSI_PROC_FS */
2674
2675 module_init(init_sg);
2676 module_exit(exit_sg);
Linux kernel - Deliverables
This page took 0.104824 seconds and 5 git commands to generate.