?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / scsi / sg.c
blob503ab8b46c0b4e8a73d7e826ba1aaf3be1abd6b0
1 /*
2 * History:
3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
4 * to allow user process control of SCSI devices.
5 * Development Sponsored by Killy Corp. NY NY
6 *
7 * Original driver (sg.c):
8 * Copyright (C) 1992 Lawrence Foard
9 * Version 2 and 3 extensions to driver:
10 * Copyright (C) 1998 - 2014 Douglas Gilbert
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 */
18
19 static int sg_version_num = 30536; /* 2 digits for each component */
20 #define SG_VERSION_STR "3.5.36"
21
22 /*
23 * D. P. Gilbert (dgilbert@interlog.com), notes:
24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
26 * (otherwise the macros compile to empty statements).
27 *
28 */
29 #include <linux/module.h>
30
31 #include <linux/fs.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/string.h>
35 #include <linux/mm.h>
36 #include <linux/errno.h>
37 #include <linux/mtio.h>
38 #include <linux/ioctl.h>
39 #include <linux/slab.h>
40 #include <linux/fcntl.h>
41 #include <linux/init.h>
42 #include <linux/poll.h>
43 #include <linux/moduleparam.h>
44 #include <linux/cdev.h>
45 #include <linux/idr.h>
46 #include <linux/seq_file.h>
47 #include <linux/blkdev.h>
48 #include <linux/delay.h>
49 #include <linux/blktrace_api.h>
50 #include <linux/mutex.h>
51 #include <linux/atomic.h>
52 #include <linux/ratelimit.h>
53 #include <linux/uio.h>
54
55 #include "scsi.h"
56 #include <scsi/scsi_dbg.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_driver.h>
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/sg.h>
61
62 #include "scsi_logging.h"
63
64 #ifdef CONFIG_SCSI_PROC_FS
65 #include <linux/proc_fs.h>
66 static char *sg_version_date = "20140603";
67
68 static int sg_proc_init(void);
69 static void sg_proc_cleanup(void);
70 #endif
71
72 #define SG_ALLOW_DIO_DEF 0
73
74 #define SG_MAX_DEVS 32768
75
76 /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type
77 * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater
78 * than 16 bytes are "variable length" whose length is a multiple of 4
79 */
80 #define SG_MAX_CDB_SIZE 252
81
82 /*
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 if (srp->rq->cmd != srp->rq->__cmd)
792 kfree(srp->rq->cmd);
793
794 blk_end_request_all(srp->rq, -EIO);
795 srp->rq = NULL;
796 }
797
798 sg_finish_rem_req(srp);
799 return -ENODEV;
800 }
801
802 hp->duration = jiffies_to_msecs(jiffies);
803 if (hp->interface_id != '\0' && /* v3 (or later) interface */
804 (SG_FLAG_Q_AT_TAIL & hp->flags))
805 at_head = 0;
806 else
807 at_head = 1;
808
809 srp->rq->timeout = timeout;
810 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
811 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
812 srp->rq, at_head, sg_rq_end_io);
813 return 0;
814 }
815
816 static int srp_done(Sg_fd *sfp, Sg_request *srp)
817 {
818 unsigned long flags;
819 int ret;
820
821 read_lock_irqsave(&sfp->rq_list_lock, flags);
822 ret = srp->done;
823 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
824 return ret;
825 }
826
827 static int max_sectors_bytes(struct request_queue *q)
828 {
829 unsigned int max_sectors = queue_max_sectors(q);
830
831 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
832
833 return max_sectors << 9;
834 }
835
836 static long
837 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
838 {
839 void __user *p = (void __user *)arg;
840 int __user *ip = p;
841 int result, val, read_only;
842 Sg_device *sdp;
843 Sg_fd *sfp;
844 Sg_request *srp;
845 unsigned long iflags;
846
847 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
848 return -ENXIO;
849
850 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
851 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
852 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
853
854 switch (cmd_in) {
855 case SG_IO:
856 if (atomic_read(&sdp->detaching))
857 return -ENODEV;
858 if (!scsi_block_when_processing_errors(sdp->device))
859 return -ENXIO;
860 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
861 return -EFAULT;
862 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
863 1, read_only, 1, &srp);
864 if (result < 0)
865 return result;
866 result = wait_event_interruptible(sfp->read_wait,
867 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
868 if (atomic_read(&sdp->detaching))
869 return -ENODEV;
870 write_lock_irq(&sfp->rq_list_lock);
871 if (srp->done) {
872 srp->done = 2;
873 write_unlock_irq(&sfp->rq_list_lock);
874 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
875 return (result < 0) ? result : 0;
876 }
877 srp->orphan = 1;
878 write_unlock_irq(&sfp->rq_list_lock);
879 return result; /* -ERESTARTSYS because signal hit process */
880 case SG_SET_TIMEOUT:
881 result = get_user(val, ip);
882 if (result)
883 return result;
884 if (val < 0)
885 return -EIO;
886 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
887 val = MULDIV (INT_MAX, USER_HZ, HZ);
888 sfp->timeout_user = val;
889 sfp->timeout = MULDIV (val, HZ, USER_HZ);
890
891 return 0;
892 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
893 /* strange ..., for backward compatibility */
894 return sfp->timeout_user;
895 case SG_SET_FORCE_LOW_DMA:
896 result = get_user(val, ip);
897 if (result)
898 return result;
899 if (val) {
900 sfp->low_dma = 1;
901 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
902 val = (int) sfp->reserve.bufflen;
903 sg_remove_scat(sfp, &sfp->reserve);
904 sg_build_reserve(sfp, val);
905 }
906 } else {
907 if (atomic_read(&sdp->detaching))
908 return -ENODEV;
909 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
910 }
911 return 0;
912 case SG_GET_LOW_DMA:
913 return put_user((int) sfp->low_dma, ip);
914 case SG_GET_SCSI_ID:
915 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
916 return -EFAULT;
917 else {
918 sg_scsi_id_t __user *sg_idp = p;
919
920 if (atomic_read(&sdp->detaching))
921 return -ENODEV;
922 __put_user((int) sdp->device->host->host_no,
923 &sg_idp->host_no);
924 __put_user((int) sdp->device->channel,
925 &sg_idp->channel);
926 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
927 __put_user((int) sdp->device->lun, &sg_idp->lun);
928 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
929 __put_user((short) sdp->device->host->cmd_per_lun,
930 &sg_idp->h_cmd_per_lun);
931 __put_user((short) sdp->device->queue_depth,
932 &sg_idp->d_queue_depth);
933 __put_user(0, &sg_idp->unused[0]);
934 __put_user(0, &sg_idp->unused[1]);
935 return 0;
936 }
937 case SG_SET_FORCE_PACK_ID:
938 result = get_user(val, ip);
939 if (result)
940 return result;
941 sfp->force_packid = val ? 1 : 0;
942 return 0;
943 case SG_GET_PACK_ID:
944 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
945 return -EFAULT;
946 read_lock_irqsave(&sfp->rq_list_lock, iflags);
947 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
948 if ((1 == srp->done) && (!srp->sg_io_owned)) {
949 read_unlock_irqrestore(&sfp->rq_list_lock,
950 iflags);
951 __put_user(srp->header.pack_id, ip);
952 return 0;
953 }
954 }
955 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
956 __put_user(-1, ip);
957 return 0;
958 case SG_GET_NUM_WAITING:
959 read_lock_irqsave(&sfp->rq_list_lock, iflags);
960 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
961 if ((1 == srp->done) && (!srp->sg_io_owned))
962 ++val;
963 }
964 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
965 return put_user(val, ip);
966 case SG_GET_SG_TABLESIZE:
967 return put_user(sdp->sg_tablesize, ip);
968 case SG_SET_RESERVED_SIZE:
969 result = get_user(val, ip);
970 if (result)
971 return result;
972 if (val < 0)
973 return -EINVAL;
974 val = min_t(int, val,
975 max_sectors_bytes(sdp->device->request_queue));
976 if (val != sfp->reserve.bufflen) {
977 if (sg_res_in_use(sfp) || sfp->mmap_called)
978 return -EBUSY;
979 sg_remove_scat(sfp, &sfp->reserve);
980 sg_build_reserve(sfp, val);
981 }
982 return 0;
983 case SG_GET_RESERVED_SIZE:
984 val = min_t(int, sfp->reserve.bufflen,
985 max_sectors_bytes(sdp->device->request_queue));
986 return put_user(val, ip);
987 case SG_SET_COMMAND_Q:
988 result = get_user(val, ip);
989 if (result)
990 return result;
991 sfp->cmd_q = val ? 1 : 0;
992 return 0;
993 case SG_GET_COMMAND_Q:
994 return put_user((int) sfp->cmd_q, ip);
995 case SG_SET_KEEP_ORPHAN:
996 result = get_user(val, ip);
997 if (result)
998 return result;
999 sfp->keep_orphan = val;
1000 return 0;
1001 case SG_GET_KEEP_ORPHAN:
1002 return put_user((int) sfp->keep_orphan, ip);
1003 case SG_NEXT_CMD_LEN:
1004 result = get_user(val, ip);
1005 if (result)
1006 return result;
1007 sfp->next_cmd_len = (val > 0) ? val : 0;
1008 return 0;
1009 case SG_GET_VERSION_NUM:
1010 return put_user(sg_version_num, ip);
1011 case SG_GET_ACCESS_COUNT:
1012 /* faked - we don't have a real access count anymore */
1013 val = (sdp->device ? 1 : 0);
1014 return put_user(val, ip);
1015 case SG_GET_REQUEST_TABLE:
1016 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1017 return -EFAULT;
1018 else {
1019 sg_req_info_t *rinfo;
1020 unsigned int ms;
1021
1022 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1023 GFP_KERNEL);
1024 if (!rinfo)
1025 return -ENOMEM;
1026 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1027 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1028 ++val, srp = srp ? srp->nextrp : srp) {
1029 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1030 if (srp) {
1031 rinfo[val].req_state = srp->done + 1;
1032 rinfo[val].problem =
1033 srp->header.masked_status &
1034 srp->header.host_status &
1035 srp->header.driver_status;
1036 if (srp->done)
1037 rinfo[val].duration =
1038 srp->header.duration;
1039 else {
1040 ms = jiffies_to_msecs(jiffies);
1041 rinfo[val].duration =
1042 (ms > srp->header.duration) ?
1043 (ms - srp->header.duration) : 0;
1044 }
1045 rinfo[val].orphan = srp->orphan;
1046 rinfo[val].sg_io_owned =
1047 srp->sg_io_owned;
1048 rinfo[val].pack_id =
1049 srp->header.pack_id;
1050 rinfo[val].usr_ptr =
1051 srp->header.usr_ptr;
1052 }
1053 }
1054 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1055 result = __copy_to_user(p, rinfo,
1056 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1057 result = result ? -EFAULT : 0;
1058 kfree(rinfo);
1059 return result;
1060 }
1061 case SG_EMULATED_HOST:
1062 if (atomic_read(&sdp->detaching))
1063 return -ENODEV;
1064 return put_user(sdp->device->host->hostt->emulated, ip);
1065 case SCSI_IOCTL_SEND_COMMAND:
1066 if (atomic_read(&sdp->detaching))
1067 return -ENODEV;
1068 if (read_only) {
1069 unsigned char opcode = WRITE_6;
1070 Scsi_Ioctl_Command __user *siocp = p;
1071
1072 if (copy_from_user(&opcode, siocp->data, 1))
1073 return -EFAULT;
1074 if (sg_allow_access(filp, &opcode))
1075 return -EPERM;
1076 }
1077 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1078 case SG_SET_DEBUG:
1079 result = get_user(val, ip);
1080 if (result)
1081 return result;
1082 sdp->sgdebug = (char) val;
1083 return 0;
1084 case BLKSECTGET:
1085 return put_user(max_sectors_bytes(sdp->device->request_queue),
1086 ip);
1087 case BLKTRACESETUP:
1088 return blk_trace_setup(sdp->device->request_queue,
1089 sdp->disk->disk_name,
1090 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1091 NULL,
1092 (char *)arg);
1093 case BLKTRACESTART:
1094 return blk_trace_startstop(sdp->device->request_queue, 1);
1095 case BLKTRACESTOP:
1096 return blk_trace_startstop(sdp->device->request_queue, 0);
1097 case BLKTRACETEARDOWN:
1098 return blk_trace_remove(sdp->device->request_queue);
1099 case SCSI_IOCTL_GET_IDLUN:
1100 case SCSI_IOCTL_GET_BUS_NUMBER:
1101 case SCSI_IOCTL_PROBE_HOST:
1102 case SG_GET_TRANSFORM:
1103 case SG_SCSI_RESET:
1104 if (atomic_read(&sdp->detaching))
1105 return -ENODEV;
1106 break;
1107 default:
1108 if (read_only)
1109 return -EPERM; /* don't know so take safe approach */
1110 break;
1111 }
1112
1113 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1114 cmd_in, filp->f_flags & O_NDELAY);
1115 if (result)
1116 return result;
1117 return scsi_ioctl(sdp->device, cmd_in, p);
1118 }
1119
1120 #ifdef CONFIG_COMPAT
1121 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1122 {
1123 Sg_device *sdp;
1124 Sg_fd *sfp;
1125 struct scsi_device *sdev;
1126
1127 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1128 return -ENXIO;
1129
1130 sdev = sdp->device;
1131 if (sdev->host->hostt->compat_ioctl) {
1132 int ret;
1133
1134 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1135
1136 return ret;
1137 }
1138
1139 return -ENOIOCTLCMD;
1140 }
1141 #endif
1142
1143 static unsigned int
1144 sg_poll(struct file *filp, poll_table * wait)
1145 {
1146 unsigned int res = 0;
1147 Sg_device *sdp;
1148 Sg_fd *sfp;
1149 Sg_request *srp;
1150 int count = 0;
1151 unsigned long iflags;
1152
1153 sfp = filp->private_data;
1154 if (!sfp)
1155 return POLLERR;
1156 sdp = sfp->parentdp;
1157 if (!sdp)
1158 return POLLERR;
1159 poll_wait(filp, &sfp->read_wait, wait);
1160 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1161 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1162 /* if any read waiting, flag it */
1163 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1164 res = POLLIN | POLLRDNORM;
1165 ++count;
1166 }
1167 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1168
1169 if (atomic_read(&sdp->detaching))
1170 res |= POLLHUP;
1171 else if (!sfp->cmd_q) {
1172 if (0 == count)
1173 res |= POLLOUT | POLLWRNORM;
1174 } else if (count < SG_MAX_QUEUE)
1175 res |= POLLOUT | POLLWRNORM;
1176 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1177 "sg_poll: res=0x%x\n", (int) res));
1178 return res;
1179 }
1180
1181 static int
1182 sg_fasync(int fd, struct file *filp, int mode)
1183 {
1184 Sg_device *sdp;
1185 Sg_fd *sfp;
1186
1187 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1188 return -ENXIO;
1189 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1190 "sg_fasync: mode=%d\n", mode));
1191
1192 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1193 }
1194
1195 static int
1196 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1197 {
1198 Sg_fd *sfp;
1199 unsigned long offset, len, sa;
1200 Sg_scatter_hold *rsv_schp;
1201 int k, length;
1202
1203 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1204 return VM_FAULT_SIGBUS;
1205 rsv_schp = &sfp->reserve;
1206 offset = vmf->pgoff << PAGE_SHIFT;
1207 if (offset >= rsv_schp->bufflen)
1208 return VM_FAULT_SIGBUS;
1209 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1210 "sg_vma_fault: offset=%lu, scatg=%d\n",
1211 offset, rsv_schp->k_use_sg));
1212 sa = vma->vm_start;
1213 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1214 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1215 len = vma->vm_end - sa;
1216 len = (len < length) ? len : length;
1217 if (offset < len) {
1218 struct page *page = nth_page(rsv_schp->pages[k],
1219 offset >> PAGE_SHIFT);
1220 get_page(page); /* increment page count */
1221 vmf->page = page;
1222 return 0; /* success */
1223 }
1224 sa += len;
1225 offset -= len;
1226 }
1227
1228 return VM_FAULT_SIGBUS;
1229 }
1230
1231 static const struct vm_operations_struct sg_mmap_vm_ops = {
1232 .fault = sg_vma_fault,
1233 };
1234
1235 static int
1236 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1237 {
1238 Sg_fd *sfp;
1239 unsigned long req_sz, len, sa;
1240 Sg_scatter_hold *rsv_schp;
1241 int k, length;
1242
1243 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1244 return -ENXIO;
1245 req_sz = vma->vm_end - vma->vm_start;
1246 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1247 "sg_mmap starting, vm_start=%p, len=%d\n",
1248 (void *) vma->vm_start, (int) req_sz));
1249 if (vma->vm_pgoff)
1250 return -EINVAL; /* want no offset */
1251 rsv_schp = &sfp->reserve;
1252 if (req_sz > rsv_schp->bufflen)
1253 return -ENOMEM; /* cannot map more than reserved buffer */
1254
1255 sa = vma->vm_start;
1256 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1257 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1258 len = vma->vm_end - sa;
1259 len = (len < length) ? len : length;
1260 sa += len;
1261 }
1262
1263 sfp->mmap_called = 1;
1264 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1265 vma->vm_private_data = sfp;
1266 vma->vm_ops = &sg_mmap_vm_ops;
1267 return 0;
1268 }
1269
1270 static void
1271 sg_rq_end_io_usercontext(struct work_struct *work)
1272 {
1273 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1274 struct sg_fd *sfp = srp->parentfp;
1275
1276 sg_finish_rem_req(srp);
1277 kref_put(&sfp->f_ref, sg_remove_sfp);
1278 }
1279
1280 /*
1281 * This function is a "bottom half" handler that is called by the mid
1282 * level when a command is completed (or has failed).
1283 */
1284 static void
1285 sg_rq_end_io(struct request *rq, int uptodate)
1286 {
1287 struct sg_request *srp = rq->end_io_data;
1288 Sg_device *sdp;
1289 Sg_fd *sfp;
1290 unsigned long iflags;
1291 unsigned int ms;
1292 char *sense;
1293 int result, resid, done = 1;
1294
1295 if (WARN_ON(srp->done != 0))
1296 return;
1297
1298 sfp = srp->parentfp;
1299 if (WARN_ON(sfp == NULL))
1300 return;
1301
1302 sdp = sfp->parentdp;
1303 if (unlikely(atomic_read(&sdp->detaching)))
1304 pr_info("%s: device detaching\n", __func__);
1305
1306 sense = rq->sense;
1307 result = rq->errors;
1308 resid = rq->resid_len;
1309
1310 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1311 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1312 srp->header.pack_id, result));
1313 srp->header.resid = resid;
1314 ms = jiffies_to_msecs(jiffies);
1315 srp->header.duration = (ms > srp->header.duration) ?
1316 (ms - srp->header.duration) : 0;
1317 if (0 != result) {
1318 struct scsi_sense_hdr sshdr;
1319
1320 srp->header.status = 0xff & result;
1321 srp->header.masked_status = status_byte(result);
1322 srp->header.msg_status = msg_byte(result);
1323 srp->header.host_status = host_byte(result);
1324 srp->header.driver_status = driver_byte(result);
1325 if ((sdp->sgdebug > 0) &&
1326 ((CHECK_CONDITION == srp->header.masked_status) ||
1327 (COMMAND_TERMINATED == srp->header.masked_status)))
1328 __scsi_print_sense(sdp->device, __func__, sense,
1329 SCSI_SENSE_BUFFERSIZE);
1330
1331 /* Following if statement is a patch supplied by Eric Youngdale */
1332 if (driver_byte(result) != 0
1333 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1334 && !scsi_sense_is_deferred(&sshdr)
1335 && sshdr.sense_key == UNIT_ATTENTION
1336 && sdp->device->removable) {
1337 /* Detected possible disc change. Set the bit - this */
1338 /* may be used if there are filesystems using this device */
1339 sdp->device->changed = 1;
1340 }
1341 }
1342 /* Rely on write phase to clean out srp status values, so no "else" */
1343
1344 /*
1345 * Free the request as soon as it is complete so that its resources
1346 * can be reused without waiting for userspace to read() the
1347 * result. But keep the associated bio (if any) around until
1348 * blk_rq_unmap_user() can be called from user context.
1349 */
1350 srp->rq = NULL;
1351 if (rq->cmd != rq->__cmd)
1352 kfree(rq->cmd);
1353 __blk_put_request(rq->q, rq);
1354
1355 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1356 if (unlikely(srp->orphan)) {
1357 if (sfp->keep_orphan)
1358 srp->sg_io_owned = 0;
1359 else
1360 done = 0;
1361 }
1362 srp->done = done;
1363 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1364
1365 if (likely(done)) {
1366 /* Now wake up any sg_read() that is waiting for this
1367 * packet.
1368 */
1369 wake_up_interruptible(&sfp->read_wait);
1370 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1371 kref_put(&sfp->f_ref, sg_remove_sfp);
1372 } else {
1373 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1374 schedule_work(&srp->ew.work);
1375 }
1376 }
1377
1378 static const struct file_operations sg_fops = {
1379 .owner = THIS_MODULE,
1380 .read = sg_read,
1381 .write = sg_write,
1382 .poll = sg_poll,
1383 .unlocked_ioctl = sg_ioctl,
1384 #ifdef CONFIG_COMPAT
1385 .compat_ioctl = sg_compat_ioctl,
1386 #endif
1387 .open = sg_open,
1388 .mmap = sg_mmap,
1389 .release = sg_release,
1390 .fasync = sg_fasync,
1391 .llseek = no_llseek,
1392 };
1393
1394 static struct class *sg_sysfs_class;
1395
1396 static int sg_sysfs_valid = 0;
1397
1398 static Sg_device *
1399 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1400 {
1401 struct request_queue *q = scsidp->request_queue;
1402 Sg_device *sdp;
1403 unsigned long iflags;
1404 int error;
1405 u32 k;
1406
1407 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1408 if (!sdp) {
1409 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1410 "failure\n", __func__);
1411 return ERR_PTR(-ENOMEM);
1412 }
1413
1414 idr_preload(GFP_KERNEL);
1415 write_lock_irqsave(&sg_index_lock, iflags);
1416
1417 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1418 if (error < 0) {
1419 if (error == -ENOSPC) {
1420 sdev_printk(KERN_WARNING, scsidp,
1421 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1422 scsidp->type, SG_MAX_DEVS - 1);
1423 error = -ENODEV;
1424 } else {
1425 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1426 "allocation Sg_device failure: %d\n",
1427 __func__, error);
1428 }
1429 goto out_unlock;
1430 }
1431 k = error;
1432
1433 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1434 "sg_alloc: dev=%d \n", k));
1435 sprintf(disk->disk_name, "sg%d", k);
1436 disk->first_minor = k;
1437 sdp->disk = disk;
1438 sdp->device = scsidp;
1439 mutex_init(&sdp->open_rel_lock);
1440 INIT_LIST_HEAD(&sdp->sfds);
1441 init_waitqueue_head(&sdp->open_wait);
1442 atomic_set(&sdp->detaching, 0);
1443 rwlock_init(&sdp->sfd_lock);
1444 sdp->sg_tablesize = queue_max_segments(q);
1445 sdp->index = k;
1446 kref_init(&sdp->d_ref);
1447 error = 0;
1448
1449 out_unlock:
1450 write_unlock_irqrestore(&sg_index_lock, iflags);
1451 idr_preload_end();
1452
1453 if (error) {
1454 kfree(sdp);
1455 return ERR_PTR(error);
1456 }
1457 return sdp;
1458 }
1459
1460 static int
1461 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1462 {
1463 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1464 struct gendisk *disk;
1465 Sg_device *sdp = NULL;
1466 struct cdev * cdev = NULL;
1467 int error;
1468 unsigned long iflags;
1469
1470 disk = alloc_disk(1);
1471 if (!disk) {
1472 pr_warn("%s: alloc_disk failed\n", __func__);
1473 return -ENOMEM;
1474 }
1475 disk->major = SCSI_GENERIC_MAJOR;
1476
1477 error = -ENOMEM;
1478 cdev = cdev_alloc();
1479 if (!cdev) {
1480 pr_warn("%s: cdev_alloc failed\n", __func__);
1481 goto out;
1482 }
1483 cdev->owner = THIS_MODULE;
1484 cdev->ops = &sg_fops;
1485
1486 sdp = sg_alloc(disk, scsidp);
1487 if (IS_ERR(sdp)) {
1488 pr_warn("%s: sg_alloc failed\n", __func__);
1489 error = PTR_ERR(sdp);
1490 goto out;
1491 }
1492
1493 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1494 if (error)
1495 goto cdev_add_err;
1496
1497 sdp->cdev = cdev;
1498 if (sg_sysfs_valid) {
1499 struct device *sg_class_member;
1500
1501 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1502 MKDEV(SCSI_GENERIC_MAJOR,
1503 sdp->index),
1504 sdp, "%s", disk->disk_name);
1505 if (IS_ERR(sg_class_member)) {
1506 pr_err("%s: device_create failed\n", __func__);
1507 error = PTR_ERR(sg_class_member);
1508 goto cdev_add_err;
1509 }
1510 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1511 &sg_class_member->kobj, "generic");
1512 if (error)
1513 pr_err("%s: unable to make symlink 'generic' back "
1514 "to sg%d\n", __func__, sdp->index);
1515 } else
1516 pr_warn("%s: sg_sys Invalid\n", __func__);
1517
1518 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1519 "type %d\n", sdp->index, scsidp->type);
1520
1521 dev_set_drvdata(cl_dev, sdp);
1522
1523 return 0;
1524
1525 cdev_add_err:
1526 write_lock_irqsave(&sg_index_lock, iflags);
1527 idr_remove(&sg_index_idr, sdp->index);
1528 write_unlock_irqrestore(&sg_index_lock, iflags);
1529 kfree(sdp);
1530
1531 out:
1532 put_disk(disk);
1533 if (cdev)
1534 cdev_del(cdev);
1535 return error;
1536 }
1537
1538 static void
1539 sg_device_destroy(struct kref *kref)
1540 {
1541 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1542 unsigned long flags;
1543
1544 /* CAUTION! Note that the device can still be found via idr_find()
1545 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1546 * any other cleanup.
1547 */
1548
1549 write_lock_irqsave(&sg_index_lock, flags);
1550 idr_remove(&sg_index_idr, sdp->index);
1551 write_unlock_irqrestore(&sg_index_lock, flags);
1552
1553 SCSI_LOG_TIMEOUT(3,
1554 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
1555
1556 put_disk(sdp->disk);
1557 kfree(sdp);
1558 }
1559
1560 static void
1561 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1562 {
1563 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1564 Sg_device *sdp = dev_get_drvdata(cl_dev);
1565 unsigned long iflags;
1566 Sg_fd *sfp;
1567 int val;
1568
1569 if (!sdp)
1570 return;
1571 /* want sdp->detaching non-zero as soon as possible */
1572 val = atomic_inc_return(&sdp->detaching);
1573 if (val > 1)
1574 return; /* only want to do following once per device */
1575
1576 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1577 "%s\n", __func__));
1578
1579 read_lock_irqsave(&sdp->sfd_lock, iflags);
1580 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1581 wake_up_interruptible_all(&sfp->read_wait);
1582 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1583 }
1584 wake_up_interruptible_all(&sdp->open_wait);
1585 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1586
1587 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1588 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1589 cdev_del(sdp->cdev);
1590 sdp->cdev = NULL;
1591
1592 kref_put(&sdp->d_ref, sg_device_destroy);
1593 }
1594
1595 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1596 module_param_named(def_reserved_size, def_reserved_size, int,
1597 S_IRUGO | S_IWUSR);
1598 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1599
1600 MODULE_AUTHOR("Douglas Gilbert");
1601 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1602 MODULE_LICENSE("GPL");
1603 MODULE_VERSION(SG_VERSION_STR);
1604 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1605
1606 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1607 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1608 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1609 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1610
1611 static int __init
1612 init_sg(void)
1613 {
1614 int rc;
1615
1616 if (scatter_elem_sz < PAGE_SIZE) {
1617 scatter_elem_sz = PAGE_SIZE;
1618 scatter_elem_sz_prev = scatter_elem_sz;
1619 }
1620 if (def_reserved_size >= 0)
1621 sg_big_buff = def_reserved_size;
1622 else
1623 def_reserved_size = sg_big_buff;
1624
1625 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1626 SG_MAX_DEVS, "sg");
1627 if (rc)
1628 return rc;
1629 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1630 if ( IS_ERR(sg_sysfs_class) ) {
1631 rc = PTR_ERR(sg_sysfs_class);
1632 goto err_out;
1633 }
1634 sg_sysfs_valid = 1;
1635 rc = scsi_register_interface(&sg_interface);
1636 if (0 == rc) {
1637 #ifdef CONFIG_SCSI_PROC_FS
1638 sg_proc_init();
1639 #endif /* CONFIG_SCSI_PROC_FS */
1640 return 0;
1641 }
1642 class_destroy(sg_sysfs_class);
1643 err_out:
1644 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1645 return rc;
1646 }
1647
1648 static void __exit
1649 exit_sg(void)
1650 {
1651 #ifdef CONFIG_SCSI_PROC_FS
1652 sg_proc_cleanup();
1653 #endif /* CONFIG_SCSI_PROC_FS */
1654 scsi_unregister_interface(&sg_interface);
1655 class_destroy(sg_sysfs_class);
1656 sg_sysfs_valid = 0;
1657 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1658 SG_MAX_DEVS);
1659 idr_destroy(&sg_index_idr);
1660 }
1661
1662 static int
1663 sg_start_req(Sg_request *srp, unsigned char *cmd)
1664 {
1665 int res;
1666 struct request *rq;
1667 Sg_fd *sfp = srp->parentfp;
1668 sg_io_hdr_t *hp = &srp->header;
1669 int dxfer_len = (int) hp->dxfer_len;
1670 int dxfer_dir = hp->dxfer_direction;
1671 unsigned int iov_count = hp->iovec_count;
1672 Sg_scatter_hold *req_schp = &srp->data;
1673 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1674 struct request_queue *q = sfp->parentdp->device->request_queue;
1675 struct rq_map_data *md, map_data;
1676 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1677 unsigned char *long_cmdp = NULL;
1678
1679 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1680 "sg_start_req: dxfer_len=%d\n",
1681 dxfer_len));
1682
1683 if (hp->cmd_len > BLK_MAX_CDB) {
1684 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1685 if (!long_cmdp)
1686 return -ENOMEM;
1687 }
1688
1689 /*
1690 * NOTE
1691 *
1692 * With scsi-mq enabled, there are a fixed number of preallocated
1693 * requests equal in number to shost->can_queue. If all of the
1694 * preallocated requests are already in use, then using GFP_ATOMIC with
1695 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1696 * will cause blk_get_request() to sleep until an active command
1697 * completes, freeing up a request. Neither option is ideal, but
1698 * GFP_KERNEL is the better choice to prevent userspace from getting an
1699 * unexpected EWOULDBLOCK.
1700 *
1701 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1702 * does not sleep except under memory pressure.
1703 */
1704 rq = blk_get_request(q, rw, GFP_KERNEL);
1705 if (IS_ERR(rq)) {
1706 kfree(long_cmdp);
1707 return PTR_ERR(rq);
1708 }
1709
1710 blk_rq_set_block_pc(rq);
1711
1712 if (hp->cmd_len > BLK_MAX_CDB)
1713 rq->cmd = long_cmdp;
1714 memcpy(rq->cmd, cmd, hp->cmd_len);
1715 rq->cmd_len = hp->cmd_len;
1716
1717 srp->rq = rq;
1718 rq->end_io_data = srp;
1719 rq->sense = srp->sense_b;
1720 rq->retries = SG_DEFAULT_RETRIES;
1721
1722 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1723 return 0;
1724
1725 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1726 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1727 !sfp->parentdp->device->host->unchecked_isa_dma &&
1728 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1729 md = NULL;
1730 else
1731 md = &map_data;
1732
1733 if (md) {
1734 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1735 sg_link_reserve(sfp, srp, dxfer_len);
1736 else {
1737 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1738 if (res)
1739 return res;
1740 }
1741
1742 md->pages = req_schp->pages;
1743 md->page_order = req_schp->page_order;
1744 md->nr_entries = req_schp->k_use_sg;
1745 md->offset = 0;
1746 md->null_mapped = hp->dxferp ? 0 : 1;
1747 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1748 md->from_user = 1;
1749 else
1750 md->from_user = 0;
1751 }
1752
1753 if (iov_count) {
1754 struct iovec *iov = NULL;
1755 struct iov_iter i;
1756
1757 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
1758 if (res < 0)
1759 return res;
1760
1761 iov_iter_truncate(&i, hp->dxfer_len);
1762
1763 res = blk_rq_map_user_iov(q, rq, md, &i, 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 with added FPC-III support