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Merge branch 'akpm' (fixes from Andrew Morton)
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / sg.c
1 /*
2 * History:
3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
4 * to allow user process control of SCSI devices.
5 * Development Sponsored by Killy Corp. NY NY
6 *
7 * Original driver (sg.c):
8 * Copyright (C) 1992 Lawrence Foard
9 * Version 2 and 3 extensions to driver:
10 * Copyright (C) 1998 - 2005 Douglas Gilbert
11 *
12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
19 */
20
21 static int sg_version_num = 30534; /* 2 digits for each component */
22 #define SG_VERSION_STR "3.5.34"
23
24 /*
25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
28 * (otherwise the macros compile to empty statements).
29 *
30 */
31 #include <linux/module.h>
32
33 #include <linux/fs.h>
34 #include <linux/kernel.h>
35 #include <linux/sched.h>
36 #include <linux/string.h>
37 #include <linux/mm.h>
38 #include <linux/aio.h>
39 #include <linux/errno.h>
40 #include <linux/mtio.h>
41 #include <linux/ioctl.h>
42 #include <linux/slab.h>
43 #include <linux/fcntl.h>
44 #include <linux/init.h>
45 #include <linux/poll.h>
46 #include <linux/moduleparam.h>
47 #include <linux/cdev.h>
48 #include <linux/idr.h>
49 #include <linux/seq_file.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
52 #include <linux/blktrace_api.h>
53 #include <linux/mutex.h>
54 #include <linux/ratelimit.h>
55
56 #include "scsi.h"
57 #include <scsi/scsi_dbg.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_driver.h>
60 #include <scsi/scsi_ioctl.h>
61 #include <scsi/sg.h>
62
63 #include "scsi_logging.h"
64
65 #ifdef CONFIG_SCSI_PROC_FS
66 #include <linux/proc_fs.h>
67 static char *sg_version_date = "20061027";
68
69 static int sg_proc_init(void);
70 static void sg_proc_cleanup(void);
71 #endif
72
73 #define SG_ALLOW_DIO_DEF 0
74
75 #define SG_MAX_DEVS 32768
76
77 /*
78 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
79 * Then when using 32 bit integers x * m may overflow during the calculation.
80 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
81 * calculates the same, but prevents the overflow when both m and d
82 * are "small" numbers (like HZ and USER_HZ).
83 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
84 * in 32 bits.
85 */
86 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
87
88 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
89
90 int sg_big_buff = SG_DEF_RESERVED_SIZE;
91 /* N.B. This variable is readable and writeable via
92 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
93 of this size (or less if there is not enough memory) will be reserved
94 for use by this file descriptor. [Deprecated usage: this variable is also
95 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
96 the kernel (i.e. it is not a module).] */
97 static int def_reserved_size = -1; /* picks up init parameter */
98 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
99
100 static int scatter_elem_sz = SG_SCATTER_SZ;
101 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
102
103 #define SG_SECTOR_SZ 512
104
105 static int sg_add(struct device *, struct class_interface *);
106 static void sg_remove(struct device *, struct class_interface *);
107
108 static DEFINE_IDR(sg_index_idr);
109 static DEFINE_RWLOCK(sg_index_lock);
110
111 static struct class_interface sg_interface = {
112 .add_dev = sg_add,
113 .remove_dev = sg_remove,
114 };
115
116 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
117 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
118 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
119 unsigned bufflen; /* Size of (aggregate) data buffer */
120 struct page **pages;
121 int page_order;
122 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
123 unsigned char cmd_opcode; /* first byte of command */
124 } Sg_scatter_hold;
125
126 struct sg_device; /* forward declarations */
127 struct sg_fd;
128
129 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
130 struct sg_request *nextrp; /* NULL -> tail request (slist) */
131 struct sg_fd *parentfp; /* NULL -> not in use */
132 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
133 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
134 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
135 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
136 char orphan; /* 1 -> drop on sight, 0 -> normal */
137 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
138 /* done protected by rq_list_lock */
139 char done; /* 0->before bh, 1->before read, 2->read */
140 struct request *rq;
141 struct bio *bio;
142 struct execute_work ew;
143 } Sg_request;
144
145 typedef struct sg_fd { /* holds the state of a file descriptor */
146 struct list_head sfd_siblings; /* protected by sfd_lock of device */
147 struct sg_device *parentdp; /* owning device */
148 wait_queue_head_t read_wait; /* queue read until command done */
149 rwlock_t rq_list_lock; /* protect access to list in req_arr */
150 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
151 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
152 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
153 unsigned save_scat_len; /* original length of trunc. scat. element */
154 Sg_request *headrp; /* head of request slist, NULL->empty */
155 struct fasync_struct *async_qp; /* used by asynchronous notification */
156 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
157 char low_dma; /* as in parent but possibly overridden to 1 */
158 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
159 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
160 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
161 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
162 char mmap_called; /* 0 -> mmap() never called on this fd */
163 struct kref f_ref;
164 struct execute_work ew;
165 } Sg_fd;
166
167 typedef struct sg_device { /* holds the state of each scsi generic device */
168 struct scsi_device *device;
169 int sg_tablesize; /* adapter's max scatter-gather table size */
170 u32 index; /* device index number */
171 spinlock_t sfd_lock; /* protect file descriptor list for device */
172 struct list_head sfds;
173 struct rw_semaphore o_sem; /* exclude open should hold this rwsem */
174 volatile char detached; /* 0->attached, 1->detached pending removal */
175 char exclude; /* opened for exclusive access */
176 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
177 struct gendisk *disk;
178 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
179 struct kref d_ref;
180 } Sg_device;
181
182 /* tasklet or soft irq callback */
183 static void sg_rq_end_io(struct request *rq, int uptodate);
184 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
185 static int sg_finish_rem_req(Sg_request * srp);
186 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
187 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
188 Sg_request * srp);
189 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
190 const char __user *buf, size_t count, int blocking,
191 int read_only, int sg_io_owned, Sg_request **o_srp);
192 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
193 unsigned char *cmnd, int timeout, int blocking);
194 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
195 static void sg_remove_scat(Sg_scatter_hold * schp);
196 static void sg_build_reserve(Sg_fd * sfp, int req_size);
197 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
198 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
199 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
200 static void sg_remove_sfp(struct kref *);
201 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
202 static Sg_request *sg_add_request(Sg_fd * sfp);
203 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
204 static int sg_res_in_use(Sg_fd * sfp);
205 static Sg_device *sg_get_dev(int dev);
206 static void sg_put_dev(Sg_device *sdp);
207
208 #define SZ_SG_HEADER sizeof(struct sg_header)
209 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
210 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
211 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
212
213 static int sg_allow_access(struct file *filp, unsigned char *cmd)
214 {
215 struct sg_fd *sfp = filp->private_data;
216
217 if (sfp->parentdp->device->type == TYPE_SCANNER)
218 return 0;
219
220 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
221 }
222
223 static int sfds_list_empty(Sg_device *sdp)
224 {
225 unsigned long flags;
226 int ret;
227
228 spin_lock_irqsave(&sdp->sfd_lock, flags);
229 ret = list_empty(&sdp->sfds);
230 spin_unlock_irqrestore(&sdp->sfd_lock, flags);
231 return ret;
232 }
233
234 static int
235 sg_open(struct inode *inode, struct file *filp)
236 {
237 int dev = iminor(inode);
238 int flags = filp->f_flags;
239 struct request_queue *q;
240 Sg_device *sdp;
241 Sg_fd *sfp;
242 int retval;
243
244 nonseekable_open(inode, filp);
245 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
246 sdp = sg_get_dev(dev);
247 if (IS_ERR(sdp)) {
248 retval = PTR_ERR(sdp);
249 sdp = NULL;
250 goto sg_put;
251 }
252
253 /* This driver's module count bumped by fops_get in <linux/fs.h> */
254 /* Prevent the device driver from vanishing while we sleep */
255 retval = scsi_device_get(sdp->device);
256 if (retval)
257 goto sg_put;
258
259 retval = scsi_autopm_get_device(sdp->device);
260 if (retval)
261 goto sdp_put;
262
263 if (!((flags & O_NONBLOCK) ||
264 scsi_block_when_processing_errors(sdp->device))) {
265 retval = -ENXIO;
266 /* we are in error recovery for this device */
267 goto error_out;
268 }
269
270 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) {
271 retval = -EPERM; /* Can't lock it with read only access */
272 goto error_out;
273 }
274 if (flags & O_NONBLOCK) {
275 if (flags & O_EXCL) {
276 if (!down_write_trylock(&sdp->o_sem)) {
277 retval = -EBUSY;
278 goto error_out;
279 }
280 } else {
281 if (!down_read_trylock(&sdp->o_sem)) {
282 retval = -EBUSY;
283 goto error_out;
284 }
285 }
286 } else {
287 if (flags & O_EXCL)
288 down_write(&sdp->o_sem);
289 else
290 down_read(&sdp->o_sem);
291 }
292 /* Since write lock is held, no need to check sfd_list */
293 if (flags & O_EXCL)
294 sdp->exclude = 1; /* used by release lock */
295
296 if (sfds_list_empty(sdp)) { /* no existing opens on this device */
297 sdp->sgdebug = 0;
298 q = sdp->device->request_queue;
299 sdp->sg_tablesize = queue_max_segments(q);
300 }
301 sfp = sg_add_sfp(sdp, dev);
302 if (!IS_ERR(sfp))
303 filp->private_data = sfp;
304 /* retval is already provably zero at this point because of the
305 * check after retval = scsi_autopm_get_device(sdp->device))
306 */
307 else {
308 retval = PTR_ERR(sfp);
309
310 if (flags & O_EXCL) {
311 sdp->exclude = 0; /* undo if error */
312 up_write(&sdp->o_sem);
313 } else
314 up_read(&sdp->o_sem);
315 error_out:
316 scsi_autopm_put_device(sdp->device);
317 sdp_put:
318 scsi_device_put(sdp->device);
319 }
320 sg_put:
321 if (sdp)
322 sg_put_dev(sdp);
323 return retval;
324 }
325
326 /* Following function was formerly called 'sg_close' */
327 static int
328 sg_release(struct inode *inode, struct file *filp)
329 {
330 Sg_device *sdp;
331 Sg_fd *sfp;
332 int excl;
333
334 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
335 return -ENXIO;
336 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
337
338 excl = sdp->exclude;
339 sdp->exclude = 0;
340 if (excl)
341 up_write(&sdp->o_sem);
342 else
343 up_read(&sdp->o_sem);
344
345 scsi_autopm_put_device(sdp->device);
346 kref_put(&sfp->f_ref, sg_remove_sfp);
347 return 0;
348 }
349
350 static ssize_t
351 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
352 {
353 Sg_device *sdp;
354 Sg_fd *sfp;
355 Sg_request *srp;
356 int req_pack_id = -1;
357 sg_io_hdr_t *hp;
358 struct sg_header *old_hdr = NULL;
359 int retval = 0;
360
361 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
362 return -ENXIO;
363 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
364 sdp->disk->disk_name, (int) count));
365
366 if (!access_ok(VERIFY_WRITE, buf, count))
367 return -EFAULT;
368 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
369 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
370 if (!old_hdr)
371 return -ENOMEM;
372 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
373 retval = -EFAULT;
374 goto free_old_hdr;
375 }
376 if (old_hdr->reply_len < 0) {
377 if (count >= SZ_SG_IO_HDR) {
378 sg_io_hdr_t *new_hdr;
379 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
380 if (!new_hdr) {
381 retval = -ENOMEM;
382 goto free_old_hdr;
383 }
384 retval =__copy_from_user
385 (new_hdr, buf, SZ_SG_IO_HDR);
386 req_pack_id = new_hdr->pack_id;
387 kfree(new_hdr);
388 if (retval) {
389 retval = -EFAULT;
390 goto free_old_hdr;
391 }
392 }
393 } else
394 req_pack_id = old_hdr->pack_id;
395 }
396 srp = sg_get_rq_mark(sfp, req_pack_id);
397 if (!srp) { /* now wait on packet to arrive */
398 if (sdp->detached) {
399 retval = -ENODEV;
400 goto free_old_hdr;
401 }
402 if (filp->f_flags & O_NONBLOCK) {
403 retval = -EAGAIN;
404 goto free_old_hdr;
405 }
406 retval = wait_event_interruptible(sfp->read_wait,
407 (sdp->detached ||
408 (srp = sg_get_rq_mark(sfp, req_pack_id))));
409 if (sdp->detached) {
410 retval = -ENODEV;
411 goto free_old_hdr;
412 }
413 if (retval) {
414 /* -ERESTARTSYS as signal hit process */
415 goto free_old_hdr;
416 }
417 }
418 if (srp->header.interface_id != '\0') {
419 retval = sg_new_read(sfp, buf, count, srp);
420 goto free_old_hdr;
421 }
422
423 hp = &srp->header;
424 if (old_hdr == NULL) {
425 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
426 if (! old_hdr) {
427 retval = -ENOMEM;
428 goto free_old_hdr;
429 }
430 }
431 memset(old_hdr, 0, SZ_SG_HEADER);
432 old_hdr->reply_len = (int) hp->timeout;
433 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
434 old_hdr->pack_id = hp->pack_id;
435 old_hdr->twelve_byte =
436 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
437 old_hdr->target_status = hp->masked_status;
438 old_hdr->host_status = hp->host_status;
439 old_hdr->driver_status = hp->driver_status;
440 if ((CHECK_CONDITION & hp->masked_status) ||
441 (DRIVER_SENSE & hp->driver_status))
442 memcpy(old_hdr->sense_buffer, srp->sense_b,
443 sizeof (old_hdr->sense_buffer));
444 switch (hp->host_status) {
445 /* This setup of 'result' is for backward compatibility and is best
446 ignored by the user who should use target, host + driver status */
447 case DID_OK:
448 case DID_PASSTHROUGH:
449 case DID_SOFT_ERROR:
450 old_hdr->result = 0;
451 break;
452 case DID_NO_CONNECT:
453 case DID_BUS_BUSY:
454 case DID_TIME_OUT:
455 old_hdr->result = EBUSY;
456 break;
457 case DID_BAD_TARGET:
458 case DID_ABORT:
459 case DID_PARITY:
460 case DID_RESET:
461 case DID_BAD_INTR:
462 old_hdr->result = EIO;
463 break;
464 case DID_ERROR:
465 old_hdr->result = (srp->sense_b[0] == 0 &&
466 hp->masked_status == GOOD) ? 0 : EIO;
467 break;
468 default:
469 old_hdr->result = EIO;
470 break;
471 }
472
473 /* Now copy the result back to the user buffer. */
474 if (count >= SZ_SG_HEADER) {
475 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
476 retval = -EFAULT;
477 goto free_old_hdr;
478 }
479 buf += SZ_SG_HEADER;
480 if (count > old_hdr->reply_len)
481 count = old_hdr->reply_len;
482 if (count > SZ_SG_HEADER) {
483 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
484 retval = -EFAULT;
485 goto free_old_hdr;
486 }
487 }
488 } else
489 count = (old_hdr->result == 0) ? 0 : -EIO;
490 sg_finish_rem_req(srp);
491 retval = count;
492 free_old_hdr:
493 kfree(old_hdr);
494 return retval;
495 }
496
497 static ssize_t
498 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
499 {
500 sg_io_hdr_t *hp = &srp->header;
501 int err = 0;
502 int len;
503
504 if (count < SZ_SG_IO_HDR) {
505 err = -EINVAL;
506 goto err_out;
507 }
508 hp->sb_len_wr = 0;
509 if ((hp->mx_sb_len > 0) && hp->sbp) {
510 if ((CHECK_CONDITION & hp->masked_status) ||
511 (DRIVER_SENSE & hp->driver_status)) {
512 int sb_len = SCSI_SENSE_BUFFERSIZE;
513 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
514 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
515 len = (len > sb_len) ? sb_len : len;
516 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
517 err = -EFAULT;
518 goto err_out;
519 }
520 hp->sb_len_wr = len;
521 }
522 }
523 if (hp->masked_status || hp->host_status || hp->driver_status)
524 hp->info |= SG_INFO_CHECK;
525 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
526 err = -EFAULT;
527 goto err_out;
528 }
529 err_out:
530 err = sg_finish_rem_req(srp);
531 return (0 == err) ? count : err;
532 }
533
534 static ssize_t
535 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
536 {
537 int mxsize, cmd_size, k;
538 int input_size, blocking;
539 unsigned char opcode;
540 Sg_device *sdp;
541 Sg_fd *sfp;
542 Sg_request *srp;
543 struct sg_header old_hdr;
544 sg_io_hdr_t *hp;
545 unsigned char cmnd[MAX_COMMAND_SIZE];
546
547 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
548 return -ENXIO;
549 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
550 sdp->disk->disk_name, (int) count));
551 if (sdp->detached)
552 return -ENODEV;
553 if (!((filp->f_flags & O_NONBLOCK) ||
554 scsi_block_when_processing_errors(sdp->device)))
555 return -ENXIO;
556
557 if (!access_ok(VERIFY_READ, buf, count))
558 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
559 if (count < SZ_SG_HEADER)
560 return -EIO;
561 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
562 return -EFAULT;
563 blocking = !(filp->f_flags & O_NONBLOCK);
564 if (old_hdr.reply_len < 0)
565 return sg_new_write(sfp, filp, buf, count,
566 blocking, 0, 0, NULL);
567 if (count < (SZ_SG_HEADER + 6))
568 return -EIO; /* The minimum scsi command length is 6 bytes. */
569
570 if (!(srp = sg_add_request(sfp))) {
571 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
572 return -EDOM;
573 }
574 buf += SZ_SG_HEADER;
575 __get_user(opcode, buf);
576 if (sfp->next_cmd_len > 0) {
577 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
578 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
579 sfp->next_cmd_len = 0;
580 sg_remove_request(sfp, srp);
581 return -EIO;
582 }
583 cmd_size = sfp->next_cmd_len;
584 sfp->next_cmd_len = 0; /* reset so only this write() effected */
585 } else {
586 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
587 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
588 cmd_size = 12;
589 }
590 SCSI_LOG_TIMEOUT(4, printk(
591 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
592 /* Determine buffer size. */
593 input_size = count - cmd_size;
594 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
595 mxsize -= SZ_SG_HEADER;
596 input_size -= SZ_SG_HEADER;
597 if (input_size < 0) {
598 sg_remove_request(sfp, srp);
599 return -EIO; /* User did not pass enough bytes for this command. */
600 }
601 hp = &srp->header;
602 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
603 hp->cmd_len = (unsigned char) cmd_size;
604 hp->iovec_count = 0;
605 hp->mx_sb_len = 0;
606 if (input_size > 0)
607 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
608 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
609 else
610 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
611 hp->dxfer_len = mxsize;
612 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
613 hp->dxferp = (char __user *)buf + cmd_size;
614 else
615 hp->dxferp = NULL;
616 hp->sbp = NULL;
617 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
618 hp->flags = input_size; /* structure abuse ... */
619 hp->pack_id = old_hdr.pack_id;
620 hp->usr_ptr = NULL;
621 if (__copy_from_user(cmnd, buf, cmd_size))
622 return -EFAULT;
623 /*
624 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
625 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
626 * is a non-zero input_size, so emit a warning.
627 */
628 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
629 static char cmd[TASK_COMM_LEN];
630 if (strcmp(current->comm, cmd)) {
631 printk_ratelimited(KERN_WARNING
632 "sg_write: data in/out %d/%d bytes "
633 "for SCSI command 0x%x-- guessing "
634 "data in;\n program %s not setting "
635 "count and/or reply_len properly\n",
636 old_hdr.reply_len - (int)SZ_SG_HEADER,
637 input_size, (unsigned int) cmnd[0],
638 current->comm);
639 strcpy(cmd, current->comm);
640 }
641 }
642 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
643 return (k < 0) ? k : count;
644 }
645
646 static ssize_t
647 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
648 size_t count, int blocking, int read_only, int sg_io_owned,
649 Sg_request **o_srp)
650 {
651 int k;
652 Sg_request *srp;
653 sg_io_hdr_t *hp;
654 unsigned char cmnd[MAX_COMMAND_SIZE];
655 int timeout;
656 unsigned long ul_timeout;
657
658 if (count < SZ_SG_IO_HDR)
659 return -EINVAL;
660 if (!access_ok(VERIFY_READ, buf, count))
661 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
662
663 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
664 if (!(srp = sg_add_request(sfp))) {
665 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
666 return -EDOM;
667 }
668 srp->sg_io_owned = sg_io_owned;
669 hp = &srp->header;
670 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
671 sg_remove_request(sfp, srp);
672 return -EFAULT;
673 }
674 if (hp->interface_id != 'S') {
675 sg_remove_request(sfp, srp);
676 return -ENOSYS;
677 }
678 if (hp->flags & SG_FLAG_MMAP_IO) {
679 if (hp->dxfer_len > sfp->reserve.bufflen) {
680 sg_remove_request(sfp, srp);
681 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
682 }
683 if (hp->flags & SG_FLAG_DIRECT_IO) {
684 sg_remove_request(sfp, srp);
685 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
686 }
687 if (sg_res_in_use(sfp)) {
688 sg_remove_request(sfp, srp);
689 return -EBUSY; /* reserve buffer already being used */
690 }
691 }
692 ul_timeout = msecs_to_jiffies(srp->header.timeout);
693 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
694 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
695 sg_remove_request(sfp, srp);
696 return -EMSGSIZE;
697 }
698 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
699 sg_remove_request(sfp, srp);
700 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
701 }
702 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
703 sg_remove_request(sfp, srp);
704 return -EFAULT;
705 }
706 if (read_only && sg_allow_access(file, cmnd)) {
707 sg_remove_request(sfp, srp);
708 return -EPERM;
709 }
710 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
711 if (k < 0)
712 return k;
713 if (o_srp)
714 *o_srp = srp;
715 return count;
716 }
717
718 static int
719 sg_common_write(Sg_fd * sfp, Sg_request * srp,
720 unsigned char *cmnd, int timeout, int blocking)
721 {
722 int k, data_dir;
723 Sg_device *sdp = sfp->parentdp;
724 sg_io_hdr_t *hp = &srp->header;
725
726 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
727 hp->status = 0;
728 hp->masked_status = 0;
729 hp->msg_status = 0;
730 hp->info = 0;
731 hp->host_status = 0;
732 hp->driver_status = 0;
733 hp->resid = 0;
734 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
735 (int) cmnd[0], (int) hp->cmd_len));
736
737 k = sg_start_req(srp, cmnd);
738 if (k) {
739 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
740 sg_finish_rem_req(srp);
741 return k; /* probably out of space --> ENOMEM */
742 }
743 if (sdp->detached) {
744 if (srp->bio)
745 blk_end_request_all(srp->rq, -EIO);
746 sg_finish_rem_req(srp);
747 return -ENODEV;
748 }
749
750 switch (hp->dxfer_direction) {
751 case SG_DXFER_TO_FROM_DEV:
752 case SG_DXFER_FROM_DEV:
753 data_dir = DMA_FROM_DEVICE;
754 break;
755 case SG_DXFER_TO_DEV:
756 data_dir = DMA_TO_DEVICE;
757 break;
758 case SG_DXFER_UNKNOWN:
759 data_dir = DMA_BIDIRECTIONAL;
760 break;
761 default:
762 data_dir = DMA_NONE;
763 break;
764 }
765 hp->duration = jiffies_to_msecs(jiffies);
766
767 srp->rq->timeout = timeout;
768 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
769 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
770 srp->rq, 1, sg_rq_end_io);
771 return 0;
772 }
773
774 static int srp_done(Sg_fd *sfp, Sg_request *srp)
775 {
776 unsigned long flags;
777 int ret;
778
779 read_lock_irqsave(&sfp->rq_list_lock, flags);
780 ret = srp->done;
781 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
782 return ret;
783 }
784
785 static long
786 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
787 {
788 void __user *p = (void __user *)arg;
789 int __user *ip = p;
790 int result, val, read_only;
791 Sg_device *sdp;
792 Sg_fd *sfp;
793 Sg_request *srp;
794 unsigned long iflags;
795
796 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
797 return -ENXIO;
798
799 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
800 sdp->disk->disk_name, (int) cmd_in));
801 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
802
803 switch (cmd_in) {
804 case SG_IO:
805 if (sdp->detached)
806 return -ENODEV;
807 if (!scsi_block_when_processing_errors(sdp->device))
808 return -ENXIO;
809 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
810 return -EFAULT;
811 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
812 1, read_only, 1, &srp);
813 if (result < 0)
814 return result;
815 result = wait_event_interruptible(sfp->read_wait,
816 (srp_done(sfp, srp) || sdp->detached));
817 if (sdp->detached)
818 return -ENODEV;
819 write_lock_irq(&sfp->rq_list_lock);
820 if (srp->done) {
821 srp->done = 2;
822 write_unlock_irq(&sfp->rq_list_lock);
823 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
824 return (result < 0) ? result : 0;
825 }
826 srp->orphan = 1;
827 write_unlock_irq(&sfp->rq_list_lock);
828 return result; /* -ERESTARTSYS because signal hit process */
829 case SG_SET_TIMEOUT:
830 result = get_user(val, ip);
831 if (result)
832 return result;
833 if (val < 0)
834 return -EIO;
835 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
836 val = MULDIV (INT_MAX, USER_HZ, HZ);
837 sfp->timeout_user = val;
838 sfp->timeout = MULDIV (val, HZ, USER_HZ);
839
840 return 0;
841 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
842 /* strange ..., for backward compatibility */
843 return sfp->timeout_user;
844 case SG_SET_FORCE_LOW_DMA:
845 result = get_user(val, ip);
846 if (result)
847 return result;
848 if (val) {
849 sfp->low_dma = 1;
850 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
851 val = (int) sfp->reserve.bufflen;
852 sg_remove_scat(&sfp->reserve);
853 sg_build_reserve(sfp, val);
854 }
855 } else {
856 if (sdp->detached)
857 return -ENODEV;
858 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
859 }
860 return 0;
861 case SG_GET_LOW_DMA:
862 return put_user((int) sfp->low_dma, ip);
863 case SG_GET_SCSI_ID:
864 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
865 return -EFAULT;
866 else {
867 sg_scsi_id_t __user *sg_idp = p;
868
869 if (sdp->detached)
870 return -ENODEV;
871 __put_user((int) sdp->device->host->host_no,
872 &sg_idp->host_no);
873 __put_user((int) sdp->device->channel,
874 &sg_idp->channel);
875 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
876 __put_user((int) sdp->device->lun, &sg_idp->lun);
877 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
878 __put_user((short) sdp->device->host->cmd_per_lun,
879 &sg_idp->h_cmd_per_lun);
880 __put_user((short) sdp->device->queue_depth,
881 &sg_idp->d_queue_depth);
882 __put_user(0, &sg_idp->unused[0]);
883 __put_user(0, &sg_idp->unused[1]);
884 return 0;
885 }
886 case SG_SET_FORCE_PACK_ID:
887 result = get_user(val, ip);
888 if (result)
889 return result;
890 sfp->force_packid = val ? 1 : 0;
891 return 0;
892 case SG_GET_PACK_ID:
893 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
894 return -EFAULT;
895 read_lock_irqsave(&sfp->rq_list_lock, iflags);
896 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
897 if ((1 == srp->done) && (!srp->sg_io_owned)) {
898 read_unlock_irqrestore(&sfp->rq_list_lock,
899 iflags);
900 __put_user(srp->header.pack_id, ip);
901 return 0;
902 }
903 }
904 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
905 __put_user(-1, ip);
906 return 0;
907 case SG_GET_NUM_WAITING:
908 read_lock_irqsave(&sfp->rq_list_lock, iflags);
909 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
910 if ((1 == srp->done) && (!srp->sg_io_owned))
911 ++val;
912 }
913 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
914 return put_user(val, ip);
915 case SG_GET_SG_TABLESIZE:
916 return put_user(sdp->sg_tablesize, ip);
917 case SG_SET_RESERVED_SIZE:
918 result = get_user(val, ip);
919 if (result)
920 return result;
921 if (val < 0)
922 return -EINVAL;
923 val = min_t(int, val,
924 queue_max_sectors(sdp->device->request_queue) * 512);
925 if (val != sfp->reserve.bufflen) {
926 if (sg_res_in_use(sfp) || sfp->mmap_called)
927 return -EBUSY;
928 sg_remove_scat(&sfp->reserve);
929 sg_build_reserve(sfp, val);
930 }
931 return 0;
932 case SG_GET_RESERVED_SIZE:
933 val = min_t(int, sfp->reserve.bufflen,
934 queue_max_sectors(sdp->device->request_queue) * 512);
935 return put_user(val, ip);
936 case SG_SET_COMMAND_Q:
937 result = get_user(val, ip);
938 if (result)
939 return result;
940 sfp->cmd_q = val ? 1 : 0;
941 return 0;
942 case SG_GET_COMMAND_Q:
943 return put_user((int) sfp->cmd_q, ip);
944 case SG_SET_KEEP_ORPHAN:
945 result = get_user(val, ip);
946 if (result)
947 return result;
948 sfp->keep_orphan = val;
949 return 0;
950 case SG_GET_KEEP_ORPHAN:
951 return put_user((int) sfp->keep_orphan, ip);
952 case SG_NEXT_CMD_LEN:
953 result = get_user(val, ip);
954 if (result)
955 return result;
956 sfp->next_cmd_len = (val > 0) ? val : 0;
957 return 0;
958 case SG_GET_VERSION_NUM:
959 return put_user(sg_version_num, ip);
960 case SG_GET_ACCESS_COUNT:
961 /* faked - we don't have a real access count anymore */
962 val = (sdp->device ? 1 : 0);
963 return put_user(val, ip);
964 case SG_GET_REQUEST_TABLE:
965 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
966 return -EFAULT;
967 else {
968 sg_req_info_t *rinfo;
969 unsigned int ms;
970
971 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
972 GFP_KERNEL);
973 if (!rinfo)
974 return -ENOMEM;
975 read_lock_irqsave(&sfp->rq_list_lock, iflags);
976 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
977 ++val, srp = srp ? srp->nextrp : srp) {
978 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
979 if (srp) {
980 rinfo[val].req_state = srp->done + 1;
981 rinfo[val].problem =
982 srp->header.masked_status &
983 srp->header.host_status &
984 srp->header.driver_status;
985 if (srp->done)
986 rinfo[val].duration =
987 srp->header.duration;
988 else {
989 ms = jiffies_to_msecs(jiffies);
990 rinfo[val].duration =
991 (ms > srp->header.duration) ?
992 (ms - srp->header.duration) : 0;
993 }
994 rinfo[val].orphan = srp->orphan;
995 rinfo[val].sg_io_owned =
996 srp->sg_io_owned;
997 rinfo[val].pack_id =
998 srp->header.pack_id;
999 rinfo[val].usr_ptr =
1000 srp->header.usr_ptr;
1001 }
1002 }
1003 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1004 result = __copy_to_user(p, rinfo,
1005 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1006 result = result ? -EFAULT : 0;
1007 kfree(rinfo);
1008 return result;
1009 }
1010 case SG_EMULATED_HOST:
1011 if (sdp->detached)
1012 return -ENODEV;
1013 return put_user(sdp->device->host->hostt->emulated, ip);
1014 case SG_SCSI_RESET:
1015 if (sdp->detached)
1016 return -ENODEV;
1017 if (filp->f_flags & O_NONBLOCK) {
1018 if (scsi_host_in_recovery(sdp->device->host))
1019 return -EBUSY;
1020 } else if (!scsi_block_when_processing_errors(sdp->device))
1021 return -EBUSY;
1022 result = get_user(val, ip);
1023 if (result)
1024 return result;
1025 if (SG_SCSI_RESET_NOTHING == val)
1026 return 0;
1027 switch (val) {
1028 case SG_SCSI_RESET_DEVICE:
1029 val = SCSI_TRY_RESET_DEVICE;
1030 break;
1031 case SG_SCSI_RESET_TARGET:
1032 val = SCSI_TRY_RESET_TARGET;
1033 break;
1034 case SG_SCSI_RESET_BUS:
1035 val = SCSI_TRY_RESET_BUS;
1036 break;
1037 case SG_SCSI_RESET_HOST:
1038 val = SCSI_TRY_RESET_HOST;
1039 break;
1040 default:
1041 return -EINVAL;
1042 }
1043 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1044 return -EACCES;
1045 return (scsi_reset_provider(sdp->device, val) ==
1046 SUCCESS) ? 0 : -EIO;
1047 case SCSI_IOCTL_SEND_COMMAND:
1048 if (sdp->detached)
1049 return -ENODEV;
1050 if (read_only) {
1051 unsigned char opcode = WRITE_6;
1052 Scsi_Ioctl_Command __user *siocp = p;
1053
1054 if (copy_from_user(&opcode, siocp->data, 1))
1055 return -EFAULT;
1056 if (sg_allow_access(filp, &opcode))
1057 return -EPERM;
1058 }
1059 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1060 case SG_SET_DEBUG:
1061 result = get_user(val, ip);
1062 if (result)
1063 return result;
1064 sdp->sgdebug = (char) val;
1065 return 0;
1066 case SCSI_IOCTL_GET_IDLUN:
1067 case SCSI_IOCTL_GET_BUS_NUMBER:
1068 case SCSI_IOCTL_PROBE_HOST:
1069 case SG_GET_TRANSFORM:
1070 if (sdp->detached)
1071 return -ENODEV;
1072 return scsi_ioctl(sdp->device, cmd_in, p);
1073 case BLKSECTGET:
1074 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
1075 ip);
1076 case BLKTRACESETUP:
1077 return blk_trace_setup(sdp->device->request_queue,
1078 sdp->disk->disk_name,
1079 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1080 NULL,
1081 (char *)arg);
1082 case BLKTRACESTART:
1083 return blk_trace_startstop(sdp->device->request_queue, 1);
1084 case BLKTRACESTOP:
1085 return blk_trace_startstop(sdp->device->request_queue, 0);
1086 case BLKTRACETEARDOWN:
1087 return blk_trace_remove(sdp->device->request_queue);
1088 default:
1089 if (read_only)
1090 return -EPERM; /* don't know so take safe approach */
1091 return scsi_ioctl(sdp->device, cmd_in, p);
1092 }
1093 }
1094
1095 #ifdef CONFIG_COMPAT
1096 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1097 {
1098 Sg_device *sdp;
1099 Sg_fd *sfp;
1100 struct scsi_device *sdev;
1101
1102 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1103 return -ENXIO;
1104
1105 sdev = sdp->device;
1106 if (sdev->host->hostt->compat_ioctl) {
1107 int ret;
1108
1109 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1110
1111 return ret;
1112 }
1113
1114 return -ENOIOCTLCMD;
1115 }
1116 #endif
1117
1118 static unsigned int
1119 sg_poll(struct file *filp, poll_table * wait)
1120 {
1121 unsigned int res = 0;
1122 Sg_device *sdp;
1123 Sg_fd *sfp;
1124 Sg_request *srp;
1125 int count = 0;
1126 unsigned long iflags;
1127
1128 sfp = filp->private_data;
1129 if (!sfp)
1130 return POLLERR;
1131 sdp = sfp->parentdp;
1132 if (!sdp)
1133 return POLLERR;
1134 poll_wait(filp, &sfp->read_wait, wait);
1135 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1136 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1137 /* if any read waiting, flag it */
1138 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1139 res = POLLIN | POLLRDNORM;
1140 ++count;
1141 }
1142 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1143
1144 if (sdp->detached)
1145 res |= POLLHUP;
1146 else if (!sfp->cmd_q) {
1147 if (0 == count)
1148 res |= POLLOUT | POLLWRNORM;
1149 } else if (count < SG_MAX_QUEUE)
1150 res |= POLLOUT | POLLWRNORM;
1151 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1152 sdp->disk->disk_name, (int) res));
1153 return res;
1154 }
1155
1156 static int
1157 sg_fasync(int fd, struct file *filp, int mode)
1158 {
1159 Sg_device *sdp;
1160 Sg_fd *sfp;
1161
1162 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1163 return -ENXIO;
1164 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1165 sdp->disk->disk_name, mode));
1166
1167 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1168 }
1169
1170 static int
1171 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1172 {
1173 Sg_fd *sfp;
1174 unsigned long offset, len, sa;
1175 Sg_scatter_hold *rsv_schp;
1176 int k, length;
1177
1178 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1179 return VM_FAULT_SIGBUS;
1180 rsv_schp = &sfp->reserve;
1181 offset = vmf->pgoff << PAGE_SHIFT;
1182 if (offset >= rsv_schp->bufflen)
1183 return VM_FAULT_SIGBUS;
1184 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1185 offset, rsv_schp->k_use_sg));
1186 sa = vma->vm_start;
1187 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1188 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1189 len = vma->vm_end - sa;
1190 len = (len < length) ? len : length;
1191 if (offset < len) {
1192 struct page *page = nth_page(rsv_schp->pages[k],
1193 offset >> PAGE_SHIFT);
1194 get_page(page); /* increment page count */
1195 vmf->page = page;
1196 return 0; /* success */
1197 }
1198 sa += len;
1199 offset -= len;
1200 }
1201
1202 return VM_FAULT_SIGBUS;
1203 }
1204
1205 static const struct vm_operations_struct sg_mmap_vm_ops = {
1206 .fault = sg_vma_fault,
1207 };
1208
1209 static int
1210 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1211 {
1212 Sg_fd *sfp;
1213 unsigned long req_sz, len, sa;
1214 Sg_scatter_hold *rsv_schp;
1215 int k, length;
1216
1217 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1218 return -ENXIO;
1219 req_sz = vma->vm_end - vma->vm_start;
1220 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1221 (void *) vma->vm_start, (int) req_sz));
1222 if (vma->vm_pgoff)
1223 return -EINVAL; /* want no offset */
1224 rsv_schp = &sfp->reserve;
1225 if (req_sz > rsv_schp->bufflen)
1226 return -ENOMEM; /* cannot map more than reserved buffer */
1227
1228 sa = vma->vm_start;
1229 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1230 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1231 len = vma->vm_end - sa;
1232 len = (len < length) ? len : length;
1233 sa += len;
1234 }
1235
1236 sfp->mmap_called = 1;
1237 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1238 vma->vm_private_data = sfp;
1239 vma->vm_ops = &sg_mmap_vm_ops;
1240 return 0;
1241 }
1242
1243 static void sg_rq_end_io_usercontext(struct work_struct *work)
1244 {
1245 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1246 struct sg_fd *sfp = srp->parentfp;
1247
1248 sg_finish_rem_req(srp);
1249 kref_put(&sfp->f_ref, sg_remove_sfp);
1250 }
1251
1252 /*
1253 * This function is a "bottom half" handler that is called by the mid
1254 * level when a command is completed (or has failed).
1255 */
1256 static void sg_rq_end_io(struct request *rq, int uptodate)
1257 {
1258 struct sg_request *srp = rq->end_io_data;
1259 Sg_device *sdp;
1260 Sg_fd *sfp;
1261 unsigned long iflags;
1262 unsigned int ms;
1263 char *sense;
1264 int result, resid, done = 1;
1265
1266 if (WARN_ON(srp->done != 0))
1267 return;
1268
1269 sfp = srp->parentfp;
1270 if (WARN_ON(sfp == NULL))
1271 return;
1272
1273 sdp = sfp->parentdp;
1274 if (unlikely(sdp->detached))
1275 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1276
1277 sense = rq->sense;
1278 result = rq->errors;
1279 resid = rq->resid_len;
1280
1281 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1282 sdp->disk->disk_name, srp->header.pack_id, result));
1283 srp->header.resid = resid;
1284 ms = jiffies_to_msecs(jiffies);
1285 srp->header.duration = (ms > srp->header.duration) ?
1286 (ms - srp->header.duration) : 0;
1287 if (0 != result) {
1288 struct scsi_sense_hdr sshdr;
1289
1290 srp->header.status = 0xff & result;
1291 srp->header.masked_status = status_byte(result);
1292 srp->header.msg_status = msg_byte(result);
1293 srp->header.host_status = host_byte(result);
1294 srp->header.driver_status = driver_byte(result);
1295 if ((sdp->sgdebug > 0) &&
1296 ((CHECK_CONDITION == srp->header.masked_status) ||
1297 (COMMAND_TERMINATED == srp->header.masked_status)))
1298 __scsi_print_sense("sg_cmd_done", sense,
1299 SCSI_SENSE_BUFFERSIZE);
1300
1301 /* Following if statement is a patch supplied by Eric Youngdale */
1302 if (driver_byte(result) != 0
1303 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1304 && !scsi_sense_is_deferred(&sshdr)
1305 && sshdr.sense_key == UNIT_ATTENTION
1306 && sdp->device->removable) {
1307 /* Detected possible disc change. Set the bit - this */
1308 /* may be used if there are filesystems using this device */
1309 sdp->device->changed = 1;
1310 }
1311 }
1312 /* Rely on write phase to clean out srp status values, so no "else" */
1313
1314 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1315 if (unlikely(srp->orphan)) {
1316 if (sfp->keep_orphan)
1317 srp->sg_io_owned = 0;
1318 else
1319 done = 0;
1320 }
1321 srp->done = done;
1322 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1323
1324 if (likely(done)) {
1325 /* Now wake up any sg_read() that is waiting for this
1326 * packet.
1327 */
1328 wake_up_interruptible(&sfp->read_wait);
1329 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1330 kref_put(&sfp->f_ref, sg_remove_sfp);
1331 } else {
1332 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1333 schedule_work(&srp->ew.work);
1334 }
1335 }
1336
1337 static const struct file_operations sg_fops = {
1338 .owner = THIS_MODULE,
1339 .read = sg_read,
1340 .write = sg_write,
1341 .poll = sg_poll,
1342 .unlocked_ioctl = sg_ioctl,
1343 #ifdef CONFIG_COMPAT
1344 .compat_ioctl = sg_compat_ioctl,
1345 #endif
1346 .open = sg_open,
1347 .mmap = sg_mmap,
1348 .release = sg_release,
1349 .fasync = sg_fasync,
1350 .llseek = no_llseek,
1351 };
1352
1353 static struct class *sg_sysfs_class;
1354
1355 static int sg_sysfs_valid = 0;
1356
1357 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1358 {
1359 struct request_queue *q = scsidp->request_queue;
1360 Sg_device *sdp;
1361 unsigned long iflags;
1362 int error;
1363 u32 k;
1364
1365 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1366 if (!sdp) {
1367 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1368 return ERR_PTR(-ENOMEM);
1369 }
1370
1371 idr_preload(GFP_KERNEL);
1372 write_lock_irqsave(&sg_index_lock, iflags);
1373
1374 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1375 if (error < 0) {
1376 if (error == -ENOSPC) {
1377 sdev_printk(KERN_WARNING, scsidp,
1378 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1379 scsidp->type, SG_MAX_DEVS - 1);
1380 error = -ENODEV;
1381 } else {
1382 printk(KERN_WARNING
1383 "idr allocation Sg_device failure: %d\n", error);
1384 }
1385 goto out_unlock;
1386 }
1387 k = error;
1388
1389 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1390 sprintf(disk->disk_name, "sg%d", k);
1391 disk->first_minor = k;
1392 sdp->disk = disk;
1393 sdp->device = scsidp;
1394 spin_lock_init(&sdp->sfd_lock);
1395 INIT_LIST_HEAD(&sdp->sfds);
1396 init_rwsem(&sdp->o_sem);
1397 sdp->sg_tablesize = queue_max_segments(q);
1398 sdp->index = k;
1399 kref_init(&sdp->d_ref);
1400 error = 0;
1401
1402 out_unlock:
1403 write_unlock_irqrestore(&sg_index_lock, iflags);
1404 idr_preload_end();
1405
1406 if (error) {
1407 kfree(sdp);
1408 return ERR_PTR(error);
1409 }
1410 return sdp;
1411 }
1412
1413 static int
1414 sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1415 {
1416 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1417 struct gendisk *disk;
1418 Sg_device *sdp = NULL;
1419 struct cdev * cdev = NULL;
1420 int error;
1421 unsigned long iflags;
1422
1423 disk = alloc_disk(1);
1424 if (!disk) {
1425 printk(KERN_WARNING "alloc_disk failed\n");
1426 return -ENOMEM;
1427 }
1428 disk->major = SCSI_GENERIC_MAJOR;
1429
1430 error = -ENOMEM;
1431 cdev = cdev_alloc();
1432 if (!cdev) {
1433 printk(KERN_WARNING "cdev_alloc failed\n");
1434 goto out;
1435 }
1436 cdev->owner = THIS_MODULE;
1437 cdev->ops = &sg_fops;
1438
1439 sdp = sg_alloc(disk, scsidp);
1440 if (IS_ERR(sdp)) {
1441 printk(KERN_WARNING "sg_alloc failed\n");
1442 error = PTR_ERR(sdp);
1443 goto out;
1444 }
1445
1446 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1447 if (error)
1448 goto cdev_add_err;
1449
1450 sdp->cdev = cdev;
1451 if (sg_sysfs_valid) {
1452 struct device *sg_class_member;
1453
1454 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1455 MKDEV(SCSI_GENERIC_MAJOR,
1456 sdp->index),
1457 sdp, "%s", disk->disk_name);
1458 if (IS_ERR(sg_class_member)) {
1459 printk(KERN_ERR "sg_add: "
1460 "device_create failed\n");
1461 error = PTR_ERR(sg_class_member);
1462 goto cdev_add_err;
1463 }
1464 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1465 &sg_class_member->kobj, "generic");
1466 if (error)
1467 printk(KERN_ERR "sg_add: unable to make symlink "
1468 "'generic' back to sg%d\n", sdp->index);
1469 } else
1470 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1471
1472 sdev_printk(KERN_NOTICE, scsidp,
1473 "Attached scsi generic sg%d type %d\n", sdp->index,
1474 scsidp->type);
1475
1476 dev_set_drvdata(cl_dev, sdp);
1477
1478 return 0;
1479
1480 cdev_add_err:
1481 write_lock_irqsave(&sg_index_lock, iflags);
1482 idr_remove(&sg_index_idr, sdp->index);
1483 write_unlock_irqrestore(&sg_index_lock, iflags);
1484 kfree(sdp);
1485
1486 out:
1487 put_disk(disk);
1488 if (cdev)
1489 cdev_del(cdev);
1490 return error;
1491 }
1492
1493 static void sg_device_destroy(struct kref *kref)
1494 {
1495 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1496 unsigned long flags;
1497
1498 /* CAUTION! Note that the device can still be found via idr_find()
1499 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1500 * any other cleanup.
1501 */
1502
1503 write_lock_irqsave(&sg_index_lock, flags);
1504 idr_remove(&sg_index_idr, sdp->index);
1505 write_unlock_irqrestore(&sg_index_lock, flags);
1506
1507 SCSI_LOG_TIMEOUT(3,
1508 printk("sg_device_destroy: %s\n",
1509 sdp->disk->disk_name));
1510
1511 put_disk(sdp->disk);
1512 kfree(sdp);
1513 }
1514
1515 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1516 {
1517 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1518 Sg_device *sdp = dev_get_drvdata(cl_dev);
1519 unsigned long iflags;
1520 Sg_fd *sfp;
1521
1522 if (!sdp || sdp->detached)
1523 return;
1524
1525 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1526
1527 /* Need a write lock to set sdp->detached. */
1528 write_lock_irqsave(&sg_index_lock, iflags);
1529 spin_lock(&sdp->sfd_lock);
1530 sdp->detached = 1;
1531 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1532 wake_up_interruptible(&sfp->read_wait);
1533 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1534 }
1535 spin_unlock(&sdp->sfd_lock);
1536 write_unlock_irqrestore(&sg_index_lock, iflags);
1537
1538 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1539 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1540 cdev_del(sdp->cdev);
1541 sdp->cdev = NULL;
1542
1543 sg_put_dev(sdp);
1544 }
1545
1546 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1547 module_param_named(def_reserved_size, def_reserved_size, int,
1548 S_IRUGO | S_IWUSR);
1549 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1550
1551 MODULE_AUTHOR("Douglas Gilbert");
1552 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1553 MODULE_LICENSE("GPL");
1554 MODULE_VERSION(SG_VERSION_STR);
1555 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1556
1557 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1558 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1559 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1560 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1561
1562 static int __init
1563 init_sg(void)
1564 {
1565 int rc;
1566
1567 if (scatter_elem_sz < PAGE_SIZE) {
1568 scatter_elem_sz = PAGE_SIZE;
1569 scatter_elem_sz_prev = scatter_elem_sz;
1570 }
1571 if (def_reserved_size >= 0)
1572 sg_big_buff = def_reserved_size;
1573 else
1574 def_reserved_size = sg_big_buff;
1575
1576 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1577 SG_MAX_DEVS, "sg");
1578 if (rc)
1579 return rc;
1580 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1581 if ( IS_ERR(sg_sysfs_class) ) {
1582 rc = PTR_ERR(sg_sysfs_class);
1583 goto err_out;
1584 }
1585 sg_sysfs_valid = 1;
1586 rc = scsi_register_interface(&sg_interface);
1587 if (0 == rc) {
1588 #ifdef CONFIG_SCSI_PROC_FS
1589 sg_proc_init();
1590 #endif /* CONFIG_SCSI_PROC_FS */
1591 return 0;
1592 }
1593 class_destroy(sg_sysfs_class);
1594 err_out:
1595 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1596 return rc;
1597 }
1598
1599 static void __exit
1600 exit_sg(void)
1601 {
1602 #ifdef CONFIG_SCSI_PROC_FS
1603 sg_proc_cleanup();
1604 #endif /* CONFIG_SCSI_PROC_FS */
1605 scsi_unregister_interface(&sg_interface);
1606 class_destroy(sg_sysfs_class);
1607 sg_sysfs_valid = 0;
1608 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1609 SG_MAX_DEVS);
1610 idr_destroy(&sg_index_idr);
1611 }
1612
1613 static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1614 {
1615 int res;
1616 struct request *rq;
1617 Sg_fd *sfp = srp->parentfp;
1618 sg_io_hdr_t *hp = &srp->header;
1619 int dxfer_len = (int) hp->dxfer_len;
1620 int dxfer_dir = hp->dxfer_direction;
1621 unsigned int iov_count = hp->iovec_count;
1622 Sg_scatter_hold *req_schp = &srp->data;
1623 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1624 struct request_queue *q = sfp->parentdp->device->request_queue;
1625 struct rq_map_data *md, map_data;
1626 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1627
1628 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1629 dxfer_len));
1630
1631 rq = blk_get_request(q, rw, GFP_ATOMIC);
1632 if (!rq)
1633 return -ENOMEM;
1634
1635 memcpy(rq->cmd, cmd, hp->cmd_len);
1636
1637 rq->cmd_len = hp->cmd_len;
1638 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1639
1640 srp->rq = rq;
1641 rq->end_io_data = srp;
1642 rq->sense = srp->sense_b;
1643 rq->retries = SG_DEFAULT_RETRIES;
1644
1645 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1646 return 0;
1647
1648 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1649 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1650 !sfp->parentdp->device->host->unchecked_isa_dma &&
1651 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1652 md = NULL;
1653 else
1654 md = &map_data;
1655
1656 if (md) {
1657 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1658 sg_link_reserve(sfp, srp, dxfer_len);
1659 else {
1660 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1661 if (res)
1662 return res;
1663 }
1664
1665 md->pages = req_schp->pages;
1666 md->page_order = req_schp->page_order;
1667 md->nr_entries = req_schp->k_use_sg;
1668 md->offset = 0;
1669 md->null_mapped = hp->dxferp ? 0 : 1;
1670 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1671 md->from_user = 1;
1672 else
1673 md->from_user = 0;
1674 }
1675
1676 if (iov_count) {
1677 int len, size = sizeof(struct sg_iovec) * iov_count;
1678 struct iovec *iov;
1679
1680 iov = memdup_user(hp->dxferp, size);
1681 if (IS_ERR(iov))
1682 return PTR_ERR(iov);
1683
1684 len = iov_length(iov, iov_count);
1685 if (hp->dxfer_len < len) {
1686 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1687 len = hp->dxfer_len;
1688 }
1689
1690 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1691 iov_count,
1692 len, GFP_ATOMIC);
1693 kfree(iov);
1694 } else
1695 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1696 hp->dxfer_len, GFP_ATOMIC);
1697
1698 if (!res) {
1699 srp->bio = rq->bio;
1700
1701 if (!md) {
1702 req_schp->dio_in_use = 1;
1703 hp->info |= SG_INFO_DIRECT_IO;
1704 }
1705 }
1706 return res;
1707 }
1708
1709 static int sg_finish_rem_req(Sg_request * srp)
1710 {
1711 int ret = 0;
1712
1713 Sg_fd *sfp = srp->parentfp;
1714 Sg_scatter_hold *req_schp = &srp->data;
1715
1716 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1717 if (srp->rq) {
1718 if (srp->bio)
1719 ret = blk_rq_unmap_user(srp->bio);
1720
1721 blk_put_request(srp->rq);
1722 }
1723
1724 if (srp->res_used)
1725 sg_unlink_reserve(sfp, srp);
1726 else
1727 sg_remove_scat(req_schp);
1728
1729 sg_remove_request(sfp, srp);
1730
1731 return ret;
1732 }
1733
1734 static int
1735 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1736 {
1737 int sg_bufflen = tablesize * sizeof(struct page *);
1738 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1739
1740 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1741 if (!schp->pages)
1742 return -ENOMEM;
1743 schp->sglist_len = sg_bufflen;
1744 return tablesize; /* number of scat_gath elements allocated */
1745 }
1746
1747 static int
1748 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1749 {
1750 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1751 int sg_tablesize = sfp->parentdp->sg_tablesize;
1752 int blk_size = buff_size, order;
1753 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1754
1755 if (blk_size < 0)
1756 return -EFAULT;
1757 if (0 == blk_size)
1758 ++blk_size; /* don't know why */
1759 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1760 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1761 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1762 buff_size, blk_size));
1763
1764 /* N.B. ret_sz carried into this block ... */
1765 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1766 if (mx_sc_elems < 0)
1767 return mx_sc_elems; /* most likely -ENOMEM */
1768
1769 num = scatter_elem_sz;
1770 if (unlikely(num != scatter_elem_sz_prev)) {
1771 if (num < PAGE_SIZE) {
1772 scatter_elem_sz = PAGE_SIZE;
1773 scatter_elem_sz_prev = PAGE_SIZE;
1774 } else
1775 scatter_elem_sz_prev = num;
1776 }
1777
1778 if (sfp->low_dma)
1779 gfp_mask |= GFP_DMA;
1780
1781 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1782 gfp_mask |= __GFP_ZERO;
1783
1784 order = get_order(num);
1785 retry:
1786 ret_sz = 1 << (PAGE_SHIFT + order);
1787
1788 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1789 k++, rem_sz -= ret_sz) {
1790
1791 num = (rem_sz > scatter_elem_sz_prev) ?
1792 scatter_elem_sz_prev : rem_sz;
1793
1794 schp->pages[k] = alloc_pages(gfp_mask, order);
1795 if (!schp->pages[k])
1796 goto out;
1797
1798 if (num == scatter_elem_sz_prev) {
1799 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1800 scatter_elem_sz = ret_sz;
1801 scatter_elem_sz_prev = ret_sz;
1802 }
1803 }
1804
1805 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1806 "ret_sz=%d\n", k, num, ret_sz));
1807 } /* end of for loop */
1808
1809 schp->page_order = order;
1810 schp->k_use_sg = k;
1811 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1812 "rem_sz=%d\n", k, rem_sz));
1813
1814 schp->bufflen = blk_size;
1815 if (rem_sz > 0) /* must have failed */
1816 return -ENOMEM;
1817 return 0;
1818 out:
1819 for (i = 0; i < k; i++)
1820 __free_pages(schp->pages[i], order);
1821
1822 if (--order >= 0)
1823 goto retry;
1824
1825 return -ENOMEM;
1826 }
1827
1828 static void
1829 sg_remove_scat(Sg_scatter_hold * schp)
1830 {
1831 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1832 if (schp->pages && schp->sglist_len > 0) {
1833 if (!schp->dio_in_use) {
1834 int k;
1835
1836 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1837 SCSI_LOG_TIMEOUT(5, printk(
1838 "sg_remove_scat: k=%d, pg=0x%p\n",
1839 k, schp->pages[k]));
1840 __free_pages(schp->pages[k], schp->page_order);
1841 }
1842
1843 kfree(schp->pages);
1844 }
1845 }
1846 memset(schp, 0, sizeof (*schp));
1847 }
1848
1849 static int
1850 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1851 {
1852 Sg_scatter_hold *schp = &srp->data;
1853 int k, num;
1854
1855 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1856 num_read_xfer));
1857 if ((!outp) || (num_read_xfer <= 0))
1858 return 0;
1859
1860 num = 1 << (PAGE_SHIFT + schp->page_order);
1861 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1862 if (num > num_read_xfer) {
1863 if (__copy_to_user(outp, page_address(schp->pages[k]),
1864 num_read_xfer))
1865 return -EFAULT;
1866 break;
1867 } else {
1868 if (__copy_to_user(outp, page_address(schp->pages[k]),
1869 num))
1870 return -EFAULT;
1871 num_read_xfer -= num;
1872 if (num_read_xfer <= 0)
1873 break;
1874 outp += num;
1875 }
1876 }
1877
1878 return 0;
1879 }
1880
1881 static void
1882 sg_build_reserve(Sg_fd * sfp, int req_size)
1883 {
1884 Sg_scatter_hold *schp = &sfp->reserve;
1885
1886 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1887 do {
1888 if (req_size < PAGE_SIZE)
1889 req_size = PAGE_SIZE;
1890 if (0 == sg_build_indirect(schp, sfp, req_size))
1891 return;
1892 else
1893 sg_remove_scat(schp);
1894 req_size >>= 1; /* divide by 2 */
1895 } while (req_size > (PAGE_SIZE / 2));
1896 }
1897
1898 static void
1899 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1900 {
1901 Sg_scatter_hold *req_schp = &srp->data;
1902 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1903 int k, num, rem;
1904
1905 srp->res_used = 1;
1906 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1907 rem = size;
1908
1909 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1910 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1911 if (rem <= num) {
1912 req_schp->k_use_sg = k + 1;
1913 req_schp->sglist_len = rsv_schp->sglist_len;
1914 req_schp->pages = rsv_schp->pages;
1915
1916 req_schp->bufflen = size;
1917 req_schp->page_order = rsv_schp->page_order;
1918 break;
1919 } else
1920 rem -= num;
1921 }
1922
1923 if (k >= rsv_schp->k_use_sg)
1924 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1925 }
1926
1927 static void
1928 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1929 {
1930 Sg_scatter_hold *req_schp = &srp->data;
1931
1932 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1933 (int) req_schp->k_use_sg));
1934 req_schp->k_use_sg = 0;
1935 req_schp->bufflen = 0;
1936 req_schp->pages = NULL;
1937 req_schp->page_order = 0;
1938 req_schp->sglist_len = 0;
1939 sfp->save_scat_len = 0;
1940 srp->res_used = 0;
1941 }
1942
1943 static Sg_request *
1944 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1945 {
1946 Sg_request *resp;
1947 unsigned long iflags;
1948
1949 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1950 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1951 /* look for requests that are ready + not SG_IO owned */
1952 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1953 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1954 resp->done = 2; /* guard against other readers */
1955 break;
1956 }
1957 }
1958 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1959 return resp;
1960 }
1961
1962 /* always adds to end of list */
1963 static Sg_request *
1964 sg_add_request(Sg_fd * sfp)
1965 {
1966 int k;
1967 unsigned long iflags;
1968 Sg_request *resp;
1969 Sg_request *rp = sfp->req_arr;
1970
1971 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1972 resp = sfp->headrp;
1973 if (!resp) {
1974 memset(rp, 0, sizeof (Sg_request));
1975 rp->parentfp = sfp;
1976 resp = rp;
1977 sfp->headrp = resp;
1978 } else {
1979 if (0 == sfp->cmd_q)
1980 resp = NULL; /* command queuing disallowed */
1981 else {
1982 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
1983 if (!rp->parentfp)
1984 break;
1985 }
1986 if (k < SG_MAX_QUEUE) {
1987 memset(rp, 0, sizeof (Sg_request));
1988 rp->parentfp = sfp;
1989 while (resp->nextrp)
1990 resp = resp->nextrp;
1991 resp->nextrp = rp;
1992 resp = rp;
1993 } else
1994 resp = NULL;
1995 }
1996 }
1997 if (resp) {
1998 resp->nextrp = NULL;
1999 resp->header.duration = jiffies_to_msecs(jiffies);
2000 }
2001 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2002 return resp;
2003 }
2004
2005 /* Return of 1 for found; 0 for not found */
2006 static int
2007 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2008 {
2009 Sg_request *prev_rp;
2010 Sg_request *rp;
2011 unsigned long iflags;
2012 int res = 0;
2013
2014 if ((!sfp) || (!srp) || (!sfp->headrp))
2015 return res;
2016 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2017 prev_rp = sfp->headrp;
2018 if (srp == prev_rp) {
2019 sfp->headrp = prev_rp->nextrp;
2020 prev_rp->parentfp = NULL;
2021 res = 1;
2022 } else {
2023 while ((rp = prev_rp->nextrp)) {
2024 if (srp == rp) {
2025 prev_rp->nextrp = rp->nextrp;
2026 rp->parentfp = NULL;
2027 res = 1;
2028 break;
2029 }
2030 prev_rp = rp;
2031 }
2032 }
2033 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2034 return res;
2035 }
2036
2037 static Sg_fd *
2038 sg_add_sfp(Sg_device * sdp, int dev)
2039 {
2040 Sg_fd *sfp;
2041 unsigned long iflags;
2042 int bufflen;
2043
2044 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2045 if (!sfp)
2046 return ERR_PTR(-ENOMEM);
2047
2048 init_waitqueue_head(&sfp->read_wait);
2049 rwlock_init(&sfp->rq_list_lock);
2050
2051 kref_init(&sfp->f_ref);
2052 sfp->timeout = SG_DEFAULT_TIMEOUT;
2053 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2054 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2055 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2056 sdp->device->host->unchecked_isa_dma : 1;
2057 sfp->cmd_q = SG_DEF_COMMAND_Q;
2058 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2059 sfp->parentdp = sdp;
2060 spin_lock_irqsave(&sdp->sfd_lock, iflags);
2061 if (sdp->detached) {
2062 spin_unlock_irqrestore(&sdp->sfd_lock, iflags);
2063 return ERR_PTR(-ENODEV);
2064 }
2065 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2066 spin_unlock_irqrestore(&sdp->sfd_lock, iflags);
2067 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2068 if (unlikely(sg_big_buff != def_reserved_size))
2069 sg_big_buff = def_reserved_size;
2070
2071 bufflen = min_t(int, sg_big_buff,
2072 queue_max_sectors(sdp->device->request_queue) * 512);
2073 sg_build_reserve(sfp, bufflen);
2074 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2075 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2076
2077 kref_get(&sdp->d_ref);
2078 __module_get(THIS_MODULE);
2079 return sfp;
2080 }
2081
2082 static void sg_remove_sfp_usercontext(struct work_struct *work)
2083 {
2084 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2085 struct sg_device *sdp = sfp->parentdp;
2086
2087 /* Cleanup any responses which were never read(). */
2088 while (sfp->headrp)
2089 sg_finish_rem_req(sfp->headrp);
2090
2091 if (sfp->reserve.bufflen > 0) {
2092 SCSI_LOG_TIMEOUT(6,
2093 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2094 (int) sfp->reserve.bufflen,
2095 (int) sfp->reserve.k_use_sg));
2096 sg_remove_scat(&sfp->reserve);
2097 }
2098
2099 SCSI_LOG_TIMEOUT(6,
2100 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2101 sdp->disk->disk_name,
2102 sfp));
2103 kfree(sfp);
2104
2105 scsi_device_put(sdp->device);
2106 sg_put_dev(sdp);
2107 module_put(THIS_MODULE);
2108 }
2109
2110 static void sg_remove_sfp(struct kref *kref)
2111 {
2112 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2113 struct sg_device *sdp = sfp->parentdp;
2114 unsigned long iflags;
2115
2116 spin_lock_irqsave(&sdp->sfd_lock, iflags);
2117 list_del(&sfp->sfd_siblings);
2118 spin_unlock_irqrestore(&sdp->sfd_lock, iflags);
2119
2120 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2121 schedule_work(&sfp->ew.work);
2122 }
2123
2124 static int
2125 sg_res_in_use(Sg_fd * sfp)
2126 {
2127 const Sg_request *srp;
2128 unsigned long iflags;
2129
2130 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2131 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2132 if (srp->res_used)
2133 break;
2134 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2135 return srp ? 1 : 0;
2136 }
2137
2138 #ifdef CONFIG_SCSI_PROC_FS
2139 static int
2140 sg_idr_max_id(int id, void *p, void *data)
2141 {
2142 int *k = data;
2143
2144 if (*k < id)
2145 *k = id;
2146
2147 return 0;
2148 }
2149
2150 static int
2151 sg_last_dev(void)
2152 {
2153 int k = -1;
2154 unsigned long iflags;
2155
2156 read_lock_irqsave(&sg_index_lock, iflags);
2157 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2158 read_unlock_irqrestore(&sg_index_lock, iflags);
2159 return k + 1; /* origin 1 */
2160 }
2161 #endif
2162
2163 /* must be called with sg_index_lock held */
2164 static Sg_device *sg_lookup_dev(int dev)
2165 {
2166 return idr_find(&sg_index_idr, dev);
2167 }
2168
2169 static Sg_device *sg_get_dev(int dev)
2170 {
2171 struct sg_device *sdp;
2172 unsigned long flags;
2173
2174 read_lock_irqsave(&sg_index_lock, flags);
2175 sdp = sg_lookup_dev(dev);
2176 if (!sdp)
2177 sdp = ERR_PTR(-ENXIO);
2178 else if (sdp->detached) {
2179 /* If sdp->detached, then the refcount may already be 0, in
2180 * which case it would be a bug to do kref_get().
2181 */
2182 sdp = ERR_PTR(-ENODEV);
2183 } else
2184 kref_get(&sdp->d_ref);
2185 read_unlock_irqrestore(&sg_index_lock, flags);
2186
2187 return sdp;
2188 }
2189
2190 static void sg_put_dev(struct sg_device *sdp)
2191 {
2192 kref_put(&sdp->d_ref, sg_device_destroy);
2193 }
2194
2195 #ifdef CONFIG_SCSI_PROC_FS
2196
2197 static struct proc_dir_entry *sg_proc_sgp = NULL;
2198
2199 static char sg_proc_sg_dirname[] = "scsi/sg";
2200
2201 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2202
2203 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2204 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2205 size_t count, loff_t *off);
2206 static const struct file_operations adio_fops = {
2207 .owner = THIS_MODULE,
2208 .open = sg_proc_single_open_adio,
2209 .read = seq_read,
2210 .llseek = seq_lseek,
2211 .write = sg_proc_write_adio,
2212 .release = single_release,
2213 };
2214
2215 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2216 static ssize_t sg_proc_write_dressz(struct file *filp,
2217 const char __user *buffer, size_t count, loff_t *off);
2218 static const struct file_operations dressz_fops = {
2219 .owner = THIS_MODULE,
2220 .open = sg_proc_single_open_dressz,
2221 .read = seq_read,
2222 .llseek = seq_lseek,
2223 .write = sg_proc_write_dressz,
2224 .release = single_release,
2225 };
2226
2227 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2228 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2229 static const struct file_operations version_fops = {
2230 .owner = THIS_MODULE,
2231 .open = sg_proc_single_open_version,
2232 .read = seq_read,
2233 .llseek = seq_lseek,
2234 .release = single_release,
2235 };
2236
2237 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2238 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2239 static const struct file_operations devhdr_fops = {
2240 .owner = THIS_MODULE,
2241 .open = sg_proc_single_open_devhdr,
2242 .read = seq_read,
2243 .llseek = seq_lseek,
2244 .release = single_release,
2245 };
2246
2247 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2248 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2249 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2250 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2251 static void dev_seq_stop(struct seq_file *s, void *v);
2252 static const struct file_operations dev_fops = {
2253 .owner = THIS_MODULE,
2254 .open = sg_proc_open_dev,
2255 .read = seq_read,
2256 .llseek = seq_lseek,
2257 .release = seq_release,
2258 };
2259 static const struct seq_operations dev_seq_ops = {
2260 .start = dev_seq_start,
2261 .next = dev_seq_next,
2262 .stop = dev_seq_stop,
2263 .show = sg_proc_seq_show_dev,
2264 };
2265
2266 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2267 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2268 static const struct file_operations devstrs_fops = {
2269 .owner = THIS_MODULE,
2270 .open = sg_proc_open_devstrs,
2271 .read = seq_read,
2272 .llseek = seq_lseek,
2273 .release = seq_release,
2274 };
2275 static const struct seq_operations devstrs_seq_ops = {
2276 .start = dev_seq_start,
2277 .next = dev_seq_next,
2278 .stop = dev_seq_stop,
2279 .show = sg_proc_seq_show_devstrs,
2280 };
2281
2282 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2283 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2284 static const struct file_operations debug_fops = {
2285 .owner = THIS_MODULE,
2286 .open = sg_proc_open_debug,
2287 .read = seq_read,
2288 .llseek = seq_lseek,
2289 .release = seq_release,
2290 };
2291 static const struct seq_operations debug_seq_ops = {
2292 .start = dev_seq_start,
2293 .next = dev_seq_next,
2294 .stop = dev_seq_stop,
2295 .show = sg_proc_seq_show_debug,
2296 };
2297
2298
2299 struct sg_proc_leaf {
2300 const char * name;
2301 const struct file_operations * fops;
2302 };
2303
2304 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2305 {"allow_dio", &adio_fops},
2306 {"debug", &debug_fops},
2307 {"def_reserved_size", &dressz_fops},
2308 {"device_hdr", &devhdr_fops},
2309 {"devices", &dev_fops},
2310 {"device_strs", &devstrs_fops},
2311 {"version", &version_fops}
2312 };
2313
2314 static int
2315 sg_proc_init(void)
2316 {
2317 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2318 int k;
2319
2320 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2321 if (!sg_proc_sgp)
2322 return 1;
2323 for (k = 0; k < num_leaves; ++k) {
2324 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2325 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2326 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2327 }
2328 return 0;
2329 }
2330
2331 static void
2332 sg_proc_cleanup(void)
2333 {
2334 int k;
2335 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2336
2337 if (!sg_proc_sgp)
2338 return;
2339 for (k = 0; k < num_leaves; ++k)
2340 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2341 remove_proc_entry(sg_proc_sg_dirname, NULL);
2342 }
2343
2344
2345 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2346 {
2347 seq_printf(s, "%d\n", *((int *)s->private));
2348 return 0;
2349 }
2350
2351 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2352 {
2353 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2354 }
2355
2356 static ssize_t
2357 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2358 size_t count, loff_t *off)
2359 {
2360 int err;
2361 unsigned long num;
2362
2363 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2364 return -EACCES;
2365 err = kstrtoul_from_user(buffer, count, 0, &num);
2366 if (err)
2367 return err;
2368 sg_allow_dio = num ? 1 : 0;
2369 return count;
2370 }
2371
2372 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2373 {
2374 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2375 }
2376
2377 static ssize_t
2378 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2379 size_t count, loff_t *off)
2380 {
2381 int err;
2382 unsigned long k = ULONG_MAX;
2383
2384 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2385 return -EACCES;
2386
2387 err = kstrtoul_from_user(buffer, count, 0, &k);
2388 if (err)
2389 return err;
2390 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2391 sg_big_buff = k;
2392 return count;
2393 }
2394 return -ERANGE;
2395 }
2396
2397 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2398 {
2399 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2400 sg_version_date);
2401 return 0;
2402 }
2403
2404 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2405 {
2406 return single_open(file, sg_proc_seq_show_version, NULL);
2407 }
2408
2409 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2410 {
2411 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2412 "online\n");
2413 return 0;
2414 }
2415
2416 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2417 {
2418 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2419 }
2420
2421 struct sg_proc_deviter {
2422 loff_t index;
2423 size_t max;
2424 };
2425
2426 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2427 {
2428 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2429
2430 s->private = it;
2431 if (! it)
2432 return NULL;
2433
2434 it->index = *pos;
2435 it->max = sg_last_dev();
2436 if (it->index >= it->max)
2437 return NULL;
2438 return it;
2439 }
2440
2441 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2442 {
2443 struct sg_proc_deviter * it = s->private;
2444
2445 *pos = ++it->index;
2446 return (it->index < it->max) ? it : NULL;
2447 }
2448
2449 static void dev_seq_stop(struct seq_file *s, void *v)
2450 {
2451 kfree(s->private);
2452 }
2453
2454 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2455 {
2456 return seq_open(file, &dev_seq_ops);
2457 }
2458
2459 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2460 {
2461 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2462 Sg_device *sdp;
2463 struct scsi_device *scsidp;
2464 unsigned long iflags;
2465
2466 read_lock_irqsave(&sg_index_lock, iflags);
2467 sdp = it ? sg_lookup_dev(it->index) : NULL;
2468 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2469 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2470 scsidp->host->host_no, scsidp->channel,
2471 scsidp->id, scsidp->lun, (int) scsidp->type,
2472 1,
2473 (int) scsidp->queue_depth,
2474 (int) scsidp->device_busy,
2475 (int) scsi_device_online(scsidp));
2476 else
2477 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2478 read_unlock_irqrestore(&sg_index_lock, iflags);
2479 return 0;
2480 }
2481
2482 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2483 {
2484 return seq_open(file, &devstrs_seq_ops);
2485 }
2486
2487 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2488 {
2489 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2490 Sg_device *sdp;
2491 struct scsi_device *scsidp;
2492 unsigned long iflags;
2493
2494 read_lock_irqsave(&sg_index_lock, iflags);
2495 sdp = it ? sg_lookup_dev(it->index) : NULL;
2496 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2497 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2498 scsidp->vendor, scsidp->model, scsidp->rev);
2499 else
2500 seq_printf(s, "<no active device>\n");
2501 read_unlock_irqrestore(&sg_index_lock, iflags);
2502 return 0;
2503 }
2504
2505 /* must be called while holding sg_index_lock and sfd_lock */
2506 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2507 {
2508 int k, m, new_interface, blen, usg;
2509 Sg_request *srp;
2510 Sg_fd *fp;
2511 const sg_io_hdr_t *hp;
2512 const char * cp;
2513 unsigned int ms;
2514
2515 k = 0;
2516 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2517 k++;
2518 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2519 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2520 "(res)sgat=%d low_dma=%d\n", k,
2521 jiffies_to_msecs(fp->timeout),
2522 fp->reserve.bufflen,
2523 (int) fp->reserve.k_use_sg,
2524 (int) fp->low_dma);
2525 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2526 (int) fp->cmd_q, (int) fp->force_packid,
2527 (int) fp->keep_orphan);
2528 for (m = 0, srp = fp->headrp;
2529 srp != NULL;
2530 ++m, srp = srp->nextrp) {
2531 hp = &srp->header;
2532 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2533 if (srp->res_used) {
2534 if (new_interface &&
2535 (SG_FLAG_MMAP_IO & hp->flags))
2536 cp = " mmap>> ";
2537 else
2538 cp = " rb>> ";
2539 } else {
2540 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2541 cp = " dio>> ";
2542 else
2543 cp = " ";
2544 }
2545 seq_printf(s, cp);
2546 blen = srp->data.bufflen;
2547 usg = srp->data.k_use_sg;
2548 seq_printf(s, srp->done ?
2549 ((1 == srp->done) ? "rcv:" : "fin:")
2550 : "act:");
2551 seq_printf(s, " id=%d blen=%d",
2552 srp->header.pack_id, blen);
2553 if (srp->done)
2554 seq_printf(s, " dur=%d", hp->duration);
2555 else {
2556 ms = jiffies_to_msecs(jiffies);
2557 seq_printf(s, " t_o/elap=%d/%d",
2558 (new_interface ? hp->timeout :
2559 jiffies_to_msecs(fp->timeout)),
2560 (ms > hp->duration ? ms - hp->duration : 0));
2561 }
2562 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2563 (int) srp->data.cmd_opcode);
2564 }
2565 if (0 == m)
2566 seq_printf(s, " No requests active\n");
2567 read_unlock(&fp->rq_list_lock);
2568 }
2569 }
2570
2571 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2572 {
2573 return seq_open(file, &debug_seq_ops);
2574 }
2575
2576 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2577 {
2578 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2579 Sg_device *sdp;
2580 unsigned long iflags;
2581
2582 if (it && (0 == it->index)) {
2583 seq_printf(s, "max_active_device=%d(origin 1)\n",
2584 (int)it->max);
2585 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2586 }
2587
2588 read_lock_irqsave(&sg_index_lock, iflags);
2589 sdp = it ? sg_lookup_dev(it->index) : NULL;
2590 if (sdp) {
2591 spin_lock(&sdp->sfd_lock);
2592 if (!list_empty(&sdp->sfds)) {
2593 struct scsi_device *scsidp = sdp->device;
2594
2595 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2596 if (sdp->detached)
2597 seq_printf(s, "detached pending close ");
2598 else
2599 seq_printf
2600 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2601 scsidp->host->host_no,
2602 scsidp->channel, scsidp->id,
2603 scsidp->lun,
2604 scsidp->host->hostt->emulated);
2605 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2606 sdp->sg_tablesize, sdp->exclude);
2607 sg_proc_debug_helper(s, sdp);
2608 }
2609 spin_unlock(&sdp->sfd_lock);
2610 }
2611 read_unlock_irqrestore(&sg_index_lock, iflags);
2612 return 0;
2613 }
2614
2615 #endif /* CONFIG_SCSI_PROC_FS */
2616
2617 module_init(init_sg);
2618 module_exit(exit_sg);
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