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mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / drivers / scsi / sg.c
blob1f65e32db2856a53436b18747aad50ee0fb932ec
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_SPINLOCK(sg_open_exclusive_lock);
109
110 static DEFINE_IDR(sg_index_idr);
111 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
112 file descriptor list for device */
113
114 static struct class_interface sg_interface = {
115 .add_dev = sg_add,
116 .remove_dev = sg_remove,
117 };
118
119 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
120 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
121 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
122 unsigned bufflen; /* Size of (aggregate) data buffer */
123 struct page **pages;
124 int page_order;
125 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
126 unsigned char cmd_opcode; /* first byte of command */
127 } Sg_scatter_hold;
128
129 struct sg_device; /* forward declarations */
130 struct sg_fd;
131
132 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
133 struct sg_request *nextrp; /* NULL -> tail request (slist) */
134 struct sg_fd *parentfp; /* NULL -> not in use */
135 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
136 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
137 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
138 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
139 char orphan; /* 1 -> drop on sight, 0 -> normal */
140 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
141 /* done protected by rq_list_lock */
142 char done; /* 0->before bh, 1->before read, 2->read */
143 struct request *rq;
144 struct bio *bio;
145 struct execute_work ew;
146 } Sg_request;
147
148 typedef struct sg_fd { /* holds the state of a file descriptor */
149 /* sfd_siblings is protected by sg_index_lock */
150 struct list_head sfd_siblings;
151 struct sg_device *parentdp; /* owning device */
152 wait_queue_head_t read_wait; /* queue read until command done */
153 rwlock_t rq_list_lock; /* protect access to list in req_arr */
154 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
155 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
156 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
157 unsigned save_scat_len; /* original length of trunc. scat. element */
158 Sg_request *headrp; /* head of request slist, NULL->empty */
159 struct fasync_struct *async_qp; /* used by asynchronous notification */
160 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
161 char low_dma; /* as in parent but possibly overridden to 1 */
162 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
163 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
164 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
165 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
166 char mmap_called; /* 0 -> mmap() never called on this fd */
167 struct kref f_ref;
168 struct execute_work ew;
169 } Sg_fd;
170
171 typedef struct sg_device { /* holds the state of each scsi generic device */
172 struct scsi_device *device;
173 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
174 int sg_tablesize; /* adapter's max scatter-gather table size */
175 u32 index; /* device index number */
176 /* sfds is protected by sg_index_lock */
177 struct list_head sfds;
178 volatile char detached; /* 0->attached, 1->detached pending removal */
179 /* exclude protected by sg_open_exclusive_lock */
180 char exclude; /* opened for exclusive access */
181 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
182 struct gendisk *disk;
183 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
184 struct kref d_ref;
185 } Sg_device;
186
187 /* tasklet or soft irq callback */
188 static void sg_rq_end_io(struct request *rq, int uptodate);
189 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
190 static int sg_finish_rem_req(Sg_request * srp);
191 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
192 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
193 Sg_request * srp);
194 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
195 const char __user *buf, size_t count, int blocking,
196 int read_only, int sg_io_owned, Sg_request **o_srp);
197 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
198 unsigned char *cmnd, int timeout, int blocking);
199 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
200 static void sg_remove_scat(Sg_scatter_hold * schp);
201 static void sg_build_reserve(Sg_fd * sfp, int req_size);
202 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
203 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
204 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
205 static void sg_remove_sfp(struct kref *);
206 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
207 static Sg_request *sg_add_request(Sg_fd * sfp);
208 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
209 static int sg_res_in_use(Sg_fd * sfp);
210 static Sg_device *sg_get_dev(int dev);
211 static void sg_put_dev(Sg_device *sdp);
212
213 #define SZ_SG_HEADER sizeof(struct sg_header)
214 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
215 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
216 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
217
218 static int sg_allow_access(struct file *filp, unsigned char *cmd)
219 {
220 struct sg_fd *sfp = filp->private_data;
221
222 if (sfp->parentdp->device->type == TYPE_SCANNER)
223 return 0;
224
225 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
226 }
227
228 static int get_exclude(Sg_device *sdp)
229 {
230 unsigned long flags;
231 int ret;
232
233 spin_lock_irqsave(&sg_open_exclusive_lock, flags);
234 ret = sdp->exclude;
235 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags);
236 return ret;
237 }
238
239 static int set_exclude(Sg_device *sdp, char val)
240 {
241 unsigned long flags;
242
243 spin_lock_irqsave(&sg_open_exclusive_lock, flags);
244 sdp->exclude = val;
245 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags);
246 return val;
247 }
248
249 static int sfds_list_empty(Sg_device *sdp)
250 {
251 unsigned long flags;
252 int ret;
253
254 read_lock_irqsave(&sg_index_lock, flags);
255 ret = list_empty(&sdp->sfds);
256 read_unlock_irqrestore(&sg_index_lock, flags);
257 return ret;
258 }
259
260 static int
261 sg_open(struct inode *inode, struct file *filp)
262 {
263 int dev = iminor(inode);
264 int flags = filp->f_flags;
265 struct request_queue *q;
266 Sg_device *sdp;
267 Sg_fd *sfp;
268 int res;
269 int retval;
270
271 nonseekable_open(inode, filp);
272 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
273 sdp = sg_get_dev(dev);
274 if (IS_ERR(sdp)) {
275 retval = PTR_ERR(sdp);
276 sdp = NULL;
277 goto sg_put;
278 }
279
280 /* This driver's module count bumped by fops_get in <linux/fs.h> */
281 /* Prevent the device driver from vanishing while we sleep */
282 retval = scsi_device_get(sdp->device);
283 if (retval)
284 goto sg_put;
285
286 retval = scsi_autopm_get_device(sdp->device);
287 if (retval)
288 goto sdp_put;
289
290 if (!((flags & O_NONBLOCK) ||
291 scsi_block_when_processing_errors(sdp->device))) {
292 retval = -ENXIO;
293 /* we are in error recovery for this device */
294 goto error_out;
295 }
296
297 if (flags & O_EXCL) {
298 if (O_RDONLY == (flags & O_ACCMODE)) {
299 retval = -EPERM; /* Can't lock it with read only access */
300 goto error_out;
301 }
302 if (!sfds_list_empty(sdp) && (flags & O_NONBLOCK)) {
303 retval = -EBUSY;
304 goto error_out;
305 }
306 res = wait_event_interruptible(sdp->o_excl_wait,
307 ((!sfds_list_empty(sdp) || get_exclude(sdp)) ? 0 : set_exclude(sdp, 1)));
308 if (res) {
309 retval = res; /* -ERESTARTSYS because signal hit process */
310 goto error_out;
311 }
312 } else if (get_exclude(sdp)) { /* some other fd has an exclusive lock on dev */
313 if (flags & O_NONBLOCK) {
314 retval = -EBUSY;
315 goto error_out;
316 }
317 res = wait_event_interruptible(sdp->o_excl_wait, !get_exclude(sdp));
318 if (res) {
319 retval = res; /* -ERESTARTSYS because signal hit process */
320 goto error_out;
321 }
322 }
323 if (sdp->detached) {
324 retval = -ENODEV;
325 goto error_out;
326 }
327 if (sfds_list_empty(sdp)) { /* no existing opens on this device */
328 sdp->sgdebug = 0;
329 q = sdp->device->request_queue;
330 sdp->sg_tablesize = queue_max_segments(q);
331 }
332 if ((sfp = sg_add_sfp(sdp, dev)))
333 filp->private_data = sfp;
334 else {
335 if (flags & O_EXCL) {
336 set_exclude(sdp, 0); /* undo if error */
337 wake_up_interruptible(&sdp->o_excl_wait);
338 }
339 retval = -ENOMEM;
340 goto error_out;
341 }
342 retval = 0;
343 error_out:
344 if (retval) {
345 scsi_autopm_put_device(sdp->device);
346 sdp_put:
347 scsi_device_put(sdp->device);
348 }
349 sg_put:
350 if (sdp)
351 sg_put_dev(sdp);
352 return retval;
353 }
354
355 /* Following function was formerly called 'sg_close' */
356 static int
357 sg_release(struct inode *inode, struct file *filp)
358 {
359 Sg_device *sdp;
360 Sg_fd *sfp;
361
362 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
363 return -ENXIO;
364 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
365
366 set_exclude(sdp, 0);
367 wake_up_interruptible(&sdp->o_excl_wait);
368
369 scsi_autopm_put_device(sdp->device);
370 kref_put(&sfp->f_ref, sg_remove_sfp);
371 return 0;
372 }
373
374 static ssize_t
375 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
376 {
377 Sg_device *sdp;
378 Sg_fd *sfp;
379 Sg_request *srp;
380 int req_pack_id = -1;
381 sg_io_hdr_t *hp;
382 struct sg_header *old_hdr = NULL;
383 int retval = 0;
384
385 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
386 return -ENXIO;
387 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
388 sdp->disk->disk_name, (int) count));
389
390 if (!access_ok(VERIFY_WRITE, buf, count))
391 return -EFAULT;
392 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
393 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
394 if (!old_hdr)
395 return -ENOMEM;
396 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
397 retval = -EFAULT;
398 goto free_old_hdr;
399 }
400 if (old_hdr->reply_len < 0) {
401 if (count >= SZ_SG_IO_HDR) {
402 sg_io_hdr_t *new_hdr;
403 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
404 if (!new_hdr) {
405 retval = -ENOMEM;
406 goto free_old_hdr;
407 }
408 retval =__copy_from_user
409 (new_hdr, buf, SZ_SG_IO_HDR);
410 req_pack_id = new_hdr->pack_id;
411 kfree(new_hdr);
412 if (retval) {
413 retval = -EFAULT;
414 goto free_old_hdr;
415 }
416 }
417 } else
418 req_pack_id = old_hdr->pack_id;
419 }
420 srp = sg_get_rq_mark(sfp, req_pack_id);
421 if (!srp) { /* now wait on packet to arrive */
422 if (sdp->detached) {
423 retval = -ENODEV;
424 goto free_old_hdr;
425 }
426 if (filp->f_flags & O_NONBLOCK) {
427 retval = -EAGAIN;
428 goto free_old_hdr;
429 }
430 retval = wait_event_interruptible(sfp->read_wait,
431 (sdp->detached ||
432 (srp = sg_get_rq_mark(sfp, req_pack_id))));
433 if (sdp->detached) {
434 retval = -ENODEV;
435 goto free_old_hdr;
436 }
437 if (retval) {
438 /* -ERESTARTSYS as signal hit process */
439 goto free_old_hdr;
440 }
441 }
442 if (srp->header.interface_id != '\0') {
443 retval = sg_new_read(sfp, buf, count, srp);
444 goto free_old_hdr;
445 }
446
447 hp = &srp->header;
448 if (old_hdr == NULL) {
449 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
450 if (! old_hdr) {
451 retval = -ENOMEM;
452 goto free_old_hdr;
453 }
454 }
455 memset(old_hdr, 0, SZ_SG_HEADER);
456 old_hdr->reply_len = (int) hp->timeout;
457 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
458 old_hdr->pack_id = hp->pack_id;
459 old_hdr->twelve_byte =
460 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
461 old_hdr->target_status = hp->masked_status;
462 old_hdr->host_status = hp->host_status;
463 old_hdr->driver_status = hp->driver_status;
464 if ((CHECK_CONDITION & hp->masked_status) ||
465 (DRIVER_SENSE & hp->driver_status))
466 memcpy(old_hdr->sense_buffer, srp->sense_b,
467 sizeof (old_hdr->sense_buffer));
468 switch (hp->host_status) {
469 /* This setup of 'result' is for backward compatibility and is best
470 ignored by the user who should use target, host + driver status */
471 case DID_OK:
472 case DID_PASSTHROUGH:
473 case DID_SOFT_ERROR:
474 old_hdr->result = 0;
475 break;
476 case DID_NO_CONNECT:
477 case DID_BUS_BUSY:
478 case DID_TIME_OUT:
479 old_hdr->result = EBUSY;
480 break;
481 case DID_BAD_TARGET:
482 case DID_ABORT:
483 case DID_PARITY:
484 case DID_RESET:
485 case DID_BAD_INTR:
486 old_hdr->result = EIO;
487 break;
488 case DID_ERROR:
489 old_hdr->result = (srp->sense_b[0] == 0 &&
490 hp->masked_status == GOOD) ? 0 : EIO;
491 break;
492 default:
493 old_hdr->result = EIO;
494 break;
495 }
496
497 /* Now copy the result back to the user buffer. */
498 if (count >= SZ_SG_HEADER) {
499 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
500 retval = -EFAULT;
501 goto free_old_hdr;
502 }
503 buf += SZ_SG_HEADER;
504 if (count > old_hdr->reply_len)
505 count = old_hdr->reply_len;
506 if (count > SZ_SG_HEADER) {
507 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
508 retval = -EFAULT;
509 goto free_old_hdr;
510 }
511 }
512 } else
513 count = (old_hdr->result == 0) ? 0 : -EIO;
514 sg_finish_rem_req(srp);
515 retval = count;
516 free_old_hdr:
517 kfree(old_hdr);
518 return retval;
519 }
520
521 static ssize_t
522 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
523 {
524 sg_io_hdr_t *hp = &srp->header;
525 int err = 0, err2;
526 int len;
527
528 if (count < SZ_SG_IO_HDR) {
529 err = -EINVAL;
530 goto err_out;
531 }
532 hp->sb_len_wr = 0;
533 if ((hp->mx_sb_len > 0) && hp->sbp) {
534 if ((CHECK_CONDITION & hp->masked_status) ||
535 (DRIVER_SENSE & hp->driver_status)) {
536 int sb_len = SCSI_SENSE_BUFFERSIZE;
537 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
538 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
539 len = (len > sb_len) ? sb_len : len;
540 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
541 err = -EFAULT;
542 goto err_out;
543 }
544 hp->sb_len_wr = len;
545 }
546 }
547 if (hp->masked_status || hp->host_status || hp->driver_status)
548 hp->info |= SG_INFO_CHECK;
549 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
550 err = -EFAULT;
551 goto err_out;
552 }
553 err_out:
554 err2 = sg_finish_rem_req(srp);
555 return err ? : err2 ? : count;
556 }
557
558 static ssize_t
559 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
560 {
561 int mxsize, cmd_size, k;
562 int input_size, blocking;
563 unsigned char opcode;
564 Sg_device *sdp;
565 Sg_fd *sfp;
566 Sg_request *srp;
567 struct sg_header old_hdr;
568 sg_io_hdr_t *hp;
569 unsigned char cmnd[MAX_COMMAND_SIZE];
570
571 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
572 return -ENXIO;
573 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
574 sdp->disk->disk_name, (int) count));
575 if (sdp->detached)
576 return -ENODEV;
577 if (!((filp->f_flags & O_NONBLOCK) ||
578 scsi_block_when_processing_errors(sdp->device)))
579 return -ENXIO;
580
581 if (!access_ok(VERIFY_READ, buf, count))
582 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
583 if (count < SZ_SG_HEADER)
584 return -EIO;
585 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
586 return -EFAULT;
587 blocking = !(filp->f_flags & O_NONBLOCK);
588 if (old_hdr.reply_len < 0)
589 return sg_new_write(sfp, filp, buf, count,
590 blocking, 0, 0, NULL);
591 if (count < (SZ_SG_HEADER + 6))
592 return -EIO; /* The minimum scsi command length is 6 bytes. */
593
594 if (!(srp = sg_add_request(sfp))) {
595 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
596 return -EDOM;
597 }
598 buf += SZ_SG_HEADER;
599 __get_user(opcode, buf);
600 if (sfp->next_cmd_len > 0) {
601 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
602 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
603 sfp->next_cmd_len = 0;
604 sg_remove_request(sfp, srp);
605 return -EIO;
606 }
607 cmd_size = sfp->next_cmd_len;
608 sfp->next_cmd_len = 0; /* reset so only this write() effected */
609 } else {
610 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
611 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
612 cmd_size = 12;
613 }
614 SCSI_LOG_TIMEOUT(4, printk(
615 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
616 /* Determine buffer size. */
617 input_size = count - cmd_size;
618 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
619 mxsize -= SZ_SG_HEADER;
620 input_size -= SZ_SG_HEADER;
621 if (input_size < 0) {
622 sg_remove_request(sfp, srp);
623 return -EIO; /* User did not pass enough bytes for this command. */
624 }
625 hp = &srp->header;
626 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
627 hp->cmd_len = (unsigned char) cmd_size;
628 hp->iovec_count = 0;
629 hp->mx_sb_len = 0;
630 if (input_size > 0)
631 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
632 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
633 else
634 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
635 hp->dxfer_len = mxsize;
636 if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||
637 (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV))
638 hp->dxferp = (char __user *)buf + cmd_size;
639 else
640 hp->dxferp = NULL;
641 hp->sbp = NULL;
642 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
643 hp->flags = input_size; /* structure abuse ... */
644 hp->pack_id = old_hdr.pack_id;
645 hp->usr_ptr = NULL;
646 if (__copy_from_user(cmnd, buf, cmd_size))
647 return -EFAULT;
648 /*
649 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
650 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
651 * is a non-zero input_size, so emit a warning.
652 */
653 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
654 static char cmd[TASK_COMM_LEN];
655 if (strcmp(current->comm, cmd)) {
656 printk_ratelimited(KERN_WARNING
657 "sg_write: data in/out %d/%d bytes "
658 "for SCSI command 0x%x-- guessing "
659 "data in;\n program %s not setting "
660 "count and/or reply_len properly\n",
661 old_hdr.reply_len - (int)SZ_SG_HEADER,
662 input_size, (unsigned int) cmnd[0],
663 current->comm);
664 strcpy(cmd, current->comm);
665 }
666 }
667 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
668 return (k < 0) ? k : count;
669 }
670
671 static ssize_t
672 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
673 size_t count, int blocking, int read_only, int sg_io_owned,
674 Sg_request **o_srp)
675 {
676 int k;
677 Sg_request *srp;
678 sg_io_hdr_t *hp;
679 unsigned char cmnd[MAX_COMMAND_SIZE];
680 int timeout;
681 unsigned long ul_timeout;
682
683 if (count < SZ_SG_IO_HDR)
684 return -EINVAL;
685 if (!access_ok(VERIFY_READ, buf, count))
686 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
687
688 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
689 if (!(srp = sg_add_request(sfp))) {
690 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
691 return -EDOM;
692 }
693 srp->sg_io_owned = sg_io_owned;
694 hp = &srp->header;
695 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
696 sg_remove_request(sfp, srp);
697 return -EFAULT;
698 }
699 if (hp->interface_id != 'S') {
700 sg_remove_request(sfp, srp);
701 return -ENOSYS;
702 }
703 if (hp->flags & SG_FLAG_MMAP_IO) {
704 if (hp->dxfer_len > sfp->reserve.bufflen) {
705 sg_remove_request(sfp, srp);
706 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
707 }
708 if (hp->flags & SG_FLAG_DIRECT_IO) {
709 sg_remove_request(sfp, srp);
710 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
711 }
712 if (sg_res_in_use(sfp)) {
713 sg_remove_request(sfp, srp);
714 return -EBUSY; /* reserve buffer already being used */
715 }
716 }
717 ul_timeout = msecs_to_jiffies(srp->header.timeout);
718 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
719 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
720 sg_remove_request(sfp, srp);
721 return -EMSGSIZE;
722 }
723 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
724 sg_remove_request(sfp, srp);
725 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
726 }
727 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
728 sg_remove_request(sfp, srp);
729 return -EFAULT;
730 }
731 if (read_only && sg_allow_access(file, cmnd)) {
732 sg_remove_request(sfp, srp);
733 return -EPERM;
734 }
735 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
736 if (k < 0)
737 return k;
738 if (o_srp)
739 *o_srp = srp;
740 return count;
741 }
742
743 static int
744 sg_common_write(Sg_fd * sfp, Sg_request * srp,
745 unsigned char *cmnd, int timeout, int blocking)
746 {
747 int k, data_dir;
748 Sg_device *sdp = sfp->parentdp;
749 sg_io_hdr_t *hp = &srp->header;
750
751 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
752 hp->status = 0;
753 hp->masked_status = 0;
754 hp->msg_status = 0;
755 hp->info = 0;
756 hp->host_status = 0;
757 hp->driver_status = 0;
758 hp->resid = 0;
759 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
760 (int) cmnd[0], (int) hp->cmd_len));
761
762 k = sg_start_req(srp, cmnd);
763 if (k) {
764 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
765 sg_finish_rem_req(srp);
766 return k; /* probably out of space --> ENOMEM */
767 }
768 if (sdp->detached) {
769 if (srp->bio)
770 blk_end_request_all(srp->rq, -EIO);
771 sg_finish_rem_req(srp);
772 return -ENODEV;
773 }
774
775 switch (hp->dxfer_direction) {
776 case SG_DXFER_TO_FROM_DEV:
777 case SG_DXFER_FROM_DEV:
778 data_dir = DMA_FROM_DEVICE;
779 break;
780 case SG_DXFER_TO_DEV:
781 data_dir = DMA_TO_DEVICE;
782 break;
783 case SG_DXFER_UNKNOWN:
784 data_dir = DMA_BIDIRECTIONAL;
785 break;
786 default:
787 data_dir = DMA_NONE;
788 break;
789 }
790 hp->duration = jiffies_to_msecs(jiffies);
791
792 srp->rq->timeout = timeout;
793 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
794 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
795 srp->rq, 1, sg_rq_end_io);
796 return 0;
797 }
798
799 static int srp_done(Sg_fd *sfp, Sg_request *srp)
800 {
801 unsigned long flags;
802 int ret;
803
804 read_lock_irqsave(&sfp->rq_list_lock, flags);
805 ret = srp->done;
806 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
807 return ret;
808 }
809
810 static long
811 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
812 {
813 void __user *p = (void __user *)arg;
814 int __user *ip = p;
815 int result, val, read_only;
816 Sg_device *sdp;
817 Sg_fd *sfp;
818 Sg_request *srp;
819 unsigned long iflags;
820
821 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
822 return -ENXIO;
823
824 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
825 sdp->disk->disk_name, (int) cmd_in));
826 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
827
828 switch (cmd_in) {
829 case SG_IO:
830 if (sdp->detached)
831 return -ENODEV;
832 if (!scsi_block_when_processing_errors(sdp->device))
833 return -ENXIO;
834 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
835 return -EFAULT;
836 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
837 1, read_only, 1, &srp);
838 if (result < 0)
839 return result;
840 result = wait_event_interruptible(sfp->read_wait,
841 (srp_done(sfp, srp) || sdp->detached));
842 if (sdp->detached)
843 return -ENODEV;
844 write_lock_irq(&sfp->rq_list_lock);
845 if (srp->done) {
846 srp->done = 2;
847 write_unlock_irq(&sfp->rq_list_lock);
848 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
849 return (result < 0) ? result : 0;
850 }
851 srp->orphan = 1;
852 write_unlock_irq(&sfp->rq_list_lock);
853 return result; /* -ERESTARTSYS because signal hit process */
854 case SG_SET_TIMEOUT:
855 result = get_user(val, ip);
856 if (result)
857 return result;
858 if (val < 0)
859 return -EIO;
860 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
861 val = MULDIV (INT_MAX, USER_HZ, HZ);
862 sfp->timeout_user = val;
863 sfp->timeout = MULDIV (val, HZ, USER_HZ);
864
865 return 0;
866 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
867 /* strange ..., for backward compatibility */
868 return sfp->timeout_user;
869 case SG_SET_FORCE_LOW_DMA:
870 result = get_user(val, ip);
871 if (result)
872 return result;
873 if (val) {
874 sfp->low_dma = 1;
875 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
876 val = (int) sfp->reserve.bufflen;
877 sg_remove_scat(&sfp->reserve);
878 sg_build_reserve(sfp, val);
879 }
880 } else {
881 if (sdp->detached)
882 return -ENODEV;
883 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
884 }
885 return 0;
886 case SG_GET_LOW_DMA:
887 return put_user((int) sfp->low_dma, ip);
888 case SG_GET_SCSI_ID:
889 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
890 return -EFAULT;
891 else {
892 sg_scsi_id_t __user *sg_idp = p;
893
894 if (sdp->detached)
895 return -ENODEV;
896 __put_user((int) sdp->device->host->host_no,
897 &sg_idp->host_no);
898 __put_user((int) sdp->device->channel,
899 &sg_idp->channel);
900 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
901 __put_user((int) sdp->device->lun, &sg_idp->lun);
902 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
903 __put_user((short) sdp->device->host->cmd_per_lun,
904 &sg_idp->h_cmd_per_lun);
905 __put_user((short) sdp->device->queue_depth,
906 &sg_idp->d_queue_depth);
907 __put_user(0, &sg_idp->unused[0]);
908 __put_user(0, &sg_idp->unused[1]);
909 return 0;
910 }
911 case SG_SET_FORCE_PACK_ID:
912 result = get_user(val, ip);
913 if (result)
914 return result;
915 sfp->force_packid = val ? 1 : 0;
916 return 0;
917 case SG_GET_PACK_ID:
918 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
919 return -EFAULT;
920 read_lock_irqsave(&sfp->rq_list_lock, iflags);
921 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
922 if ((1 == srp->done) && (!srp->sg_io_owned)) {
923 read_unlock_irqrestore(&sfp->rq_list_lock,
924 iflags);
925 __put_user(srp->header.pack_id, ip);
926 return 0;
927 }
928 }
929 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
930 __put_user(-1, ip);
931 return 0;
932 case SG_GET_NUM_WAITING:
933 read_lock_irqsave(&sfp->rq_list_lock, iflags);
934 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
935 if ((1 == srp->done) && (!srp->sg_io_owned))
936 ++val;
937 }
938 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
939 return put_user(val, ip);
940 case SG_GET_SG_TABLESIZE:
941 return put_user(sdp->sg_tablesize, ip);
942 case SG_SET_RESERVED_SIZE:
943 result = get_user(val, ip);
944 if (result)
945 return result;
946 if (val < 0)
947 return -EINVAL;
948 val = min_t(int, val,
949 queue_max_sectors(sdp->device->request_queue) * 512);
950 if (val != sfp->reserve.bufflen) {
951 if (sg_res_in_use(sfp) || sfp->mmap_called)
952 return -EBUSY;
953 sg_remove_scat(&sfp->reserve);
954 sg_build_reserve(sfp, val);
955 }
956 return 0;
957 case SG_GET_RESERVED_SIZE:
958 val = min_t(int, sfp->reserve.bufflen,
959 queue_max_sectors(sdp->device->request_queue) * 512);
960 return put_user(val, ip);
961 case SG_SET_COMMAND_Q:
962 result = get_user(val, ip);
963 if (result)
964 return result;
965 sfp->cmd_q = val ? 1 : 0;
966 return 0;
967 case SG_GET_COMMAND_Q:
968 return put_user((int) sfp->cmd_q, ip);
969 case SG_SET_KEEP_ORPHAN:
970 result = get_user(val, ip);
971 if (result)
972 return result;
973 sfp->keep_orphan = val;
974 return 0;
975 case SG_GET_KEEP_ORPHAN:
976 return put_user((int) sfp->keep_orphan, ip);
977 case SG_NEXT_CMD_LEN:
978 result = get_user(val, ip);
979 if (result)
980 return result;
981 sfp->next_cmd_len = (val > 0) ? val : 0;
982 return 0;
983 case SG_GET_VERSION_NUM:
984 return put_user(sg_version_num, ip);
985 case SG_GET_ACCESS_COUNT:
986 /* faked - we don't have a real access count anymore */
987 val = (sdp->device ? 1 : 0);
988 return put_user(val, ip);
989 case SG_GET_REQUEST_TABLE:
990 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
991 return -EFAULT;
992 else {
993 sg_req_info_t *rinfo;
994 unsigned int ms;
995
996 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
997 GFP_KERNEL);
998 if (!rinfo)
999 return -ENOMEM;
1000 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1001 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1002 ++val, srp = srp ? srp->nextrp : srp) {
1003 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1004 if (srp) {
1005 rinfo[val].req_state = srp->done + 1;
1006 rinfo[val].problem =
1007 srp->header.masked_status &
1008 srp->header.host_status &
1009 srp->header.driver_status;
1010 if (srp->done)
1011 rinfo[val].duration =
1012 srp->header.duration;
1013 else {
1014 ms = jiffies_to_msecs(jiffies);
1015 rinfo[val].duration =
1016 (ms > srp->header.duration) ?
1017 (ms - srp->header.duration) : 0;
1018 }
1019 rinfo[val].orphan = srp->orphan;
1020 rinfo[val].sg_io_owned =
1021 srp->sg_io_owned;
1022 rinfo[val].pack_id =
1023 srp->header.pack_id;
1024 rinfo[val].usr_ptr =
1025 srp->header.usr_ptr;
1026 }
1027 }
1028 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1029 result = __copy_to_user(p, rinfo,
1030 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1031 result = result ? -EFAULT : 0;
1032 kfree(rinfo);
1033 return result;
1034 }
1035 case SG_EMULATED_HOST:
1036 if (sdp->detached)
1037 return -ENODEV;
1038 return put_user(sdp->device->host->hostt->emulated, ip);
1039 case SG_SCSI_RESET:
1040 if (sdp->detached)
1041 return -ENODEV;
1042 if (filp->f_flags & O_NONBLOCK) {
1043 if (scsi_host_in_recovery(sdp->device->host))
1044 return -EBUSY;
1045 } else if (!scsi_block_when_processing_errors(sdp->device))
1046 return -EBUSY;
1047 result = get_user(val, ip);
1048 if (result)
1049 return result;
1050 if (SG_SCSI_RESET_NOTHING == val)
1051 return 0;
1052 switch (val) {
1053 case SG_SCSI_RESET_DEVICE:
1054 val = SCSI_TRY_RESET_DEVICE;
1055 break;
1056 case SG_SCSI_RESET_TARGET:
1057 val = SCSI_TRY_RESET_TARGET;
1058 break;
1059 case SG_SCSI_RESET_BUS:
1060 val = SCSI_TRY_RESET_BUS;
1061 break;
1062 case SG_SCSI_RESET_HOST:
1063 val = SCSI_TRY_RESET_HOST;
1064 break;
1065 default:
1066 return -EINVAL;
1067 }
1068 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1069 return -EACCES;
1070 return (scsi_reset_provider(sdp->device, val) ==
1071 SUCCESS) ? 0 : -EIO;
1072 case SCSI_IOCTL_SEND_COMMAND:
1073 if (sdp->detached)
1074 return -ENODEV;
1075 if (read_only) {
1076 unsigned char opcode = WRITE_6;
1077 Scsi_Ioctl_Command __user *siocp = p;
1078
1079 if (copy_from_user(&opcode, siocp->data, 1))
1080 return -EFAULT;
1081 if (sg_allow_access(filp, &opcode))
1082 return -EPERM;
1083 }
1084 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1085 case SG_SET_DEBUG:
1086 result = get_user(val, ip);
1087 if (result)
1088 return result;
1089 sdp->sgdebug = (char) val;
1090 return 0;
1091 case SCSI_IOCTL_GET_IDLUN:
1092 case SCSI_IOCTL_GET_BUS_NUMBER:
1093 case SCSI_IOCTL_PROBE_HOST:
1094 case SG_GET_TRANSFORM:
1095 if (sdp->detached)
1096 return -ENODEV;
1097 return scsi_ioctl(sdp->device, cmd_in, p);
1098 case BLKSECTGET:
1099 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
1100 ip);
1101 case BLKTRACESETUP:
1102 return blk_trace_setup(sdp->device->request_queue,
1103 sdp->disk->disk_name,
1104 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1105 NULL,
1106 (char *)arg);
1107 case BLKTRACESTART:
1108 return blk_trace_startstop(sdp->device->request_queue, 1);
1109 case BLKTRACESTOP:
1110 return blk_trace_startstop(sdp->device->request_queue, 0);
1111 case BLKTRACETEARDOWN:
1112 return blk_trace_remove(sdp->device->request_queue);
1113 default:
1114 if (read_only)
1115 return -EPERM; /* don't know so take safe approach */
1116 return scsi_ioctl(sdp->device, cmd_in, p);
1117 }
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 (sdp->detached)
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, printk("sg_poll: %s, res=0x%x\n",
1177 sdp->disk->disk_name, (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, printk("sg_fasync: %s, mode=%d\n",
1190 sdp->disk->disk_name, 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, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1210 offset, rsv_schp->k_use_sg));
1211 sa = vma->vm_start;
1212 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1213 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1214 len = vma->vm_end - sa;
1215 len = (len < length) ? len : length;
1216 if (offset < len) {
1217 struct page *page = nth_page(rsv_schp->pages[k],
1218 offset >> PAGE_SHIFT);
1219 get_page(page); /* increment page count */
1220 vmf->page = page;
1221 return 0; /* success */
1222 }
1223 sa += len;
1224 offset -= len;
1225 }
1226
1227 return VM_FAULT_SIGBUS;
1228 }
1229
1230 static const struct vm_operations_struct sg_mmap_vm_ops = {
1231 .fault = sg_vma_fault,
1232 };
1233
1234 static int
1235 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1236 {
1237 Sg_fd *sfp;
1238 unsigned long req_sz, len, sa;
1239 Sg_scatter_hold *rsv_schp;
1240 int k, length;
1241
1242 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1243 return -ENXIO;
1244 req_sz = vma->vm_end - vma->vm_start;
1245 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1246 (void *) vma->vm_start, (int) req_sz));
1247 if (vma->vm_pgoff)
1248 return -EINVAL; /* want no offset */
1249 rsv_schp = &sfp->reserve;
1250 if (req_sz > rsv_schp->bufflen)
1251 return -ENOMEM; /* cannot map more than reserved buffer */
1252
1253 sa = vma->vm_start;
1254 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1255 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1256 len = vma->vm_end - sa;
1257 len = (len < length) ? len : length;
1258 sa += len;
1259 }
1260
1261 sfp->mmap_called = 1;
1262 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1263 vma->vm_private_data = sfp;
1264 vma->vm_ops = &sg_mmap_vm_ops;
1265 return 0;
1266 }
1267
1268 static void sg_rq_end_io_usercontext(struct work_struct *work)
1269 {
1270 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1271 struct sg_fd *sfp = srp->parentfp;
1272
1273 sg_finish_rem_req(srp);
1274 kref_put(&sfp->f_ref, sg_remove_sfp);
1275 }
1276
1277 /*
1278 * This function is a "bottom half" handler that is called by the mid
1279 * level when a command is completed (or has failed).
1280 */
1281 static void sg_rq_end_io(struct request *rq, int uptodate)
1282 {
1283 struct sg_request *srp = rq->end_io_data;
1284 Sg_device *sdp;
1285 Sg_fd *sfp;
1286 unsigned long iflags;
1287 unsigned int ms;
1288 char *sense;
1289 int result, resid, done = 1;
1290
1291 if (WARN_ON(srp->done != 0))
1292 return;
1293
1294 sfp = srp->parentfp;
1295 if (WARN_ON(sfp == NULL))
1296 return;
1297
1298 sdp = sfp->parentdp;
1299 if (unlikely(sdp->detached))
1300 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1301
1302 sense = rq->sense;
1303 result = rq->errors;
1304 resid = rq->resid_len;
1305
1306 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1307 sdp->disk->disk_name, srp->header.pack_id, result));
1308 srp->header.resid = resid;
1309 ms = jiffies_to_msecs(jiffies);
1310 srp->header.duration = (ms > srp->header.duration) ?
1311 (ms - srp->header.duration) : 0;
1312 if (0 != result) {
1313 struct scsi_sense_hdr sshdr;
1314
1315 srp->header.status = 0xff & result;
1316 srp->header.masked_status = status_byte(result);
1317 srp->header.msg_status = msg_byte(result);
1318 srp->header.host_status = host_byte(result);
1319 srp->header.driver_status = driver_byte(result);
1320 if ((sdp->sgdebug > 0) &&
1321 ((CHECK_CONDITION == srp->header.masked_status) ||
1322 (COMMAND_TERMINATED == srp->header.masked_status)))
1323 __scsi_print_sense("sg_cmd_done", sense,
1324 SCSI_SENSE_BUFFERSIZE);
1325
1326 /* Following if statement is a patch supplied by Eric Youngdale */
1327 if (driver_byte(result) != 0
1328 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1329 && !scsi_sense_is_deferred(&sshdr)
1330 && sshdr.sense_key == UNIT_ATTENTION
1331 && sdp->device->removable) {
1332 /* Detected possible disc change. Set the bit - this */
1333 /* may be used if there are filesystems using this device */
1334 sdp->device->changed = 1;
1335 }
1336 }
1337 /* Rely on write phase to clean out srp status values, so no "else" */
1338
1339 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1340 if (unlikely(srp->orphan)) {
1341 if (sfp->keep_orphan)
1342 srp->sg_io_owned = 0;
1343 else
1344 done = 0;
1345 }
1346 srp->done = done;
1347 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1348
1349 if (likely(done)) {
1350 /* Now wake up any sg_read() that is waiting for this
1351 * packet.
1352 */
1353 wake_up_interruptible(&sfp->read_wait);
1354 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1355 kref_put(&sfp->f_ref, sg_remove_sfp);
1356 } else {
1357 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1358 schedule_work(&srp->ew.work);
1359 }
1360 }
1361
1362 static const struct file_operations sg_fops = {
1363 .owner = THIS_MODULE,
1364 .read = sg_read,
1365 .write = sg_write,
1366 .poll = sg_poll,
1367 .unlocked_ioctl = sg_ioctl,
1368 #ifdef CONFIG_COMPAT
1369 .compat_ioctl = sg_compat_ioctl,
1370 #endif
1371 .open = sg_open,
1372 .mmap = sg_mmap,
1373 .release = sg_release,
1374 .fasync = sg_fasync,
1375 .llseek = no_llseek,
1376 };
1377
1378 static struct class *sg_sysfs_class;
1379
1380 static int sg_sysfs_valid = 0;
1381
1382 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1383 {
1384 struct request_queue *q = scsidp->request_queue;
1385 Sg_device *sdp;
1386 unsigned long iflags;
1387 int error;
1388 u32 k;
1389
1390 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1391 if (!sdp) {
1392 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1393 return ERR_PTR(-ENOMEM);
1394 }
1395
1396 idr_preload(GFP_KERNEL);
1397 write_lock_irqsave(&sg_index_lock, iflags);
1398
1399 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1400 if (error < 0) {
1401 if (error == -ENOSPC) {
1402 sdev_printk(KERN_WARNING, scsidp,
1403 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1404 scsidp->type, SG_MAX_DEVS - 1);
1405 error = -ENODEV;
1406 } else {
1407 printk(KERN_WARNING
1408 "idr allocation Sg_device failure: %d\n", error);
1409 }
1410 goto out_unlock;
1411 }
1412 k = error;
1413
1414 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1415 sprintf(disk->disk_name, "sg%d", k);
1416 disk->first_minor = k;
1417 sdp->disk = disk;
1418 sdp->device = scsidp;
1419 INIT_LIST_HEAD(&sdp->sfds);
1420 init_waitqueue_head(&sdp->o_excl_wait);
1421 sdp->sg_tablesize = queue_max_segments(q);
1422 sdp->index = k;
1423 kref_init(&sdp->d_ref);
1424 error = 0;
1425
1426 out_unlock:
1427 write_unlock_irqrestore(&sg_index_lock, iflags);
1428 idr_preload_end();
1429
1430 if (error) {
1431 kfree(sdp);
1432 return ERR_PTR(error);
1433 }
1434 return sdp;
1435 }
1436
1437 static int
1438 sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1439 {
1440 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1441 struct gendisk *disk;
1442 Sg_device *sdp = NULL;
1443 struct cdev * cdev = NULL;
1444 int error;
1445 unsigned long iflags;
1446
1447 disk = alloc_disk(1);
1448 if (!disk) {
1449 printk(KERN_WARNING "alloc_disk failed\n");
1450 return -ENOMEM;
1451 }
1452 disk->major = SCSI_GENERIC_MAJOR;
1453
1454 error = -ENOMEM;
1455 cdev = cdev_alloc();
1456 if (!cdev) {
1457 printk(KERN_WARNING "cdev_alloc failed\n");
1458 goto out;
1459 }
1460 cdev->owner = THIS_MODULE;
1461 cdev->ops = &sg_fops;
1462
1463 sdp = sg_alloc(disk, scsidp);
1464 if (IS_ERR(sdp)) {
1465 printk(KERN_WARNING "sg_alloc failed\n");
1466 error = PTR_ERR(sdp);
1467 goto out;
1468 }
1469
1470 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1471 if (error)
1472 goto cdev_add_err;
1473
1474 sdp->cdev = cdev;
1475 if (sg_sysfs_valid) {
1476 struct device *sg_class_member;
1477
1478 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1479 MKDEV(SCSI_GENERIC_MAJOR,
1480 sdp->index),
1481 sdp, "%s", disk->disk_name);
1482 if (IS_ERR(sg_class_member)) {
1483 printk(KERN_ERR "sg_add: "
1484 "device_create failed\n");
1485 error = PTR_ERR(sg_class_member);
1486 goto cdev_add_err;
1487 }
1488 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1489 &sg_class_member->kobj, "generic");
1490 if (error)
1491 printk(KERN_ERR "sg_add: unable to make symlink "
1492 "'generic' back to sg%d\n", sdp->index);
1493 } else
1494 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1495
1496 sdev_printk(KERN_NOTICE, scsidp,
1497 "Attached scsi generic sg%d type %d\n", sdp->index,
1498 scsidp->type);
1499
1500 dev_set_drvdata(cl_dev, sdp);
1501
1502 return 0;
1503
1504 cdev_add_err:
1505 write_lock_irqsave(&sg_index_lock, iflags);
1506 idr_remove(&sg_index_idr, sdp->index);
1507 write_unlock_irqrestore(&sg_index_lock, iflags);
1508 kfree(sdp);
1509
1510 out:
1511 put_disk(disk);
1512 if (cdev)
1513 cdev_del(cdev);
1514 return error;
1515 }
1516
1517 static void sg_device_destroy(struct kref *kref)
1518 {
1519 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1520 unsigned long flags;
1521
1522 /* CAUTION! Note that the device can still be found via idr_find()
1523 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1524 * any other cleanup.
1525 */
1526
1527 write_lock_irqsave(&sg_index_lock, flags);
1528 idr_remove(&sg_index_idr, sdp->index);
1529 write_unlock_irqrestore(&sg_index_lock, flags);
1530
1531 SCSI_LOG_TIMEOUT(3,
1532 printk("sg_device_destroy: %s\n",
1533 sdp->disk->disk_name));
1534
1535 put_disk(sdp->disk);
1536 kfree(sdp);
1537 }
1538
1539 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1540 {
1541 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1542 Sg_device *sdp = dev_get_drvdata(cl_dev);
1543 unsigned long iflags;
1544 Sg_fd *sfp;
1545
1546 if (!sdp || sdp->detached)
1547 return;
1548
1549 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1550
1551 /* Need a write lock to set sdp->detached. */
1552 write_lock_irqsave(&sg_index_lock, iflags);
1553 sdp->detached = 1;
1554 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1555 wake_up_interruptible(&sfp->read_wait);
1556 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1557 }
1558 write_unlock_irqrestore(&sg_index_lock, iflags);
1559
1560 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1561 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1562 cdev_del(sdp->cdev);
1563 sdp->cdev = NULL;
1564
1565 sg_put_dev(sdp);
1566 }
1567
1568 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1569 module_param_named(def_reserved_size, def_reserved_size, int,
1570 S_IRUGO | S_IWUSR);
1571 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1572
1573 MODULE_AUTHOR("Douglas Gilbert");
1574 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1575 MODULE_LICENSE("GPL");
1576 MODULE_VERSION(SG_VERSION_STR);
1577 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1578
1579 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1580 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1581 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1582 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1583
1584 static int __init
1585 init_sg(void)
1586 {
1587 int rc;
1588
1589 if (scatter_elem_sz < PAGE_SIZE) {
1590 scatter_elem_sz = PAGE_SIZE;
1591 scatter_elem_sz_prev = scatter_elem_sz;
1592 }
1593 if (def_reserved_size >= 0)
1594 sg_big_buff = def_reserved_size;
1595 else
1596 def_reserved_size = sg_big_buff;
1597
1598 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1599 SG_MAX_DEVS, "sg");
1600 if (rc)
1601 return rc;
1602 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1603 if ( IS_ERR(sg_sysfs_class) ) {
1604 rc = PTR_ERR(sg_sysfs_class);
1605 goto err_out;
1606 }
1607 sg_sysfs_valid = 1;
1608 rc = scsi_register_interface(&sg_interface);
1609 if (0 == rc) {
1610 #ifdef CONFIG_SCSI_PROC_FS
1611 sg_proc_init();
1612 #endif /* CONFIG_SCSI_PROC_FS */
1613 return 0;
1614 }
1615 class_destroy(sg_sysfs_class);
1616 err_out:
1617 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1618 return rc;
1619 }
1620
1621 static void __exit
1622 exit_sg(void)
1623 {
1624 #ifdef CONFIG_SCSI_PROC_FS
1625 sg_proc_cleanup();
1626 #endif /* CONFIG_SCSI_PROC_FS */
1627 scsi_unregister_interface(&sg_interface);
1628 class_destroy(sg_sysfs_class);
1629 sg_sysfs_valid = 0;
1630 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1631 SG_MAX_DEVS);
1632 idr_destroy(&sg_index_idr);
1633 }
1634
1635 static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1636 {
1637 int res;
1638 struct request *rq;
1639 Sg_fd *sfp = srp->parentfp;
1640 sg_io_hdr_t *hp = &srp->header;
1641 int dxfer_len = (int) hp->dxfer_len;
1642 int dxfer_dir = hp->dxfer_direction;
1643 unsigned int iov_count = hp->iovec_count;
1644 Sg_scatter_hold *req_schp = &srp->data;
1645 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1646 struct request_queue *q = sfp->parentdp->device->request_queue;
1647 struct rq_map_data *md, map_data;
1648 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1649
1650 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1651 dxfer_len));
1652
1653 rq = blk_get_request(q, rw, GFP_ATOMIC);
1654 if (!rq)
1655 return -ENOMEM;
1656
1657 memcpy(rq->cmd, cmd, hp->cmd_len);
1658
1659 rq->cmd_len = hp->cmd_len;
1660 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1661
1662 srp->rq = rq;
1663 rq->end_io_data = srp;
1664 rq->sense = srp->sense_b;
1665 rq->retries = SG_DEFAULT_RETRIES;
1666
1667 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1668 return 0;
1669
1670 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1671 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1672 !sfp->parentdp->device->host->unchecked_isa_dma &&
1673 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1674 md = NULL;
1675 else
1676 md = &map_data;
1677
1678 if (md) {
1679 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1680 sg_link_reserve(sfp, srp, dxfer_len);
1681 else {
1682 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1683 if (res)
1684 return res;
1685 }
1686
1687 md->pages = req_schp->pages;
1688 md->page_order = req_schp->page_order;
1689 md->nr_entries = req_schp->k_use_sg;
1690 md->offset = 0;
1691 md->null_mapped = hp->dxferp ? 0 : 1;
1692 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1693 md->from_user = 1;
1694 else
1695 md->from_user = 0;
1696 }
1697
1698 if (unlikely(iov_count > UIO_MAXIOV))
1699 return -EINVAL;
1700
1701 if (iov_count) {
1702 int len, size = sizeof(struct sg_iovec) * iov_count;
1703 struct iovec *iov;
1704
1705 iov = memdup_user(hp->dxferp, size);
1706 if (IS_ERR(iov))
1707 return PTR_ERR(iov);
1708
1709 len = iov_length(iov, iov_count);
1710 if (hp->dxfer_len < len) {
1711 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1712 len = hp->dxfer_len;
1713 }
1714
1715 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1716 iov_count,
1717 len, GFP_ATOMIC);
1718 kfree(iov);
1719 } else
1720 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1721 hp->dxfer_len, GFP_ATOMIC);
1722
1723 if (!res) {
1724 srp->bio = rq->bio;
1725
1726 if (!md) {
1727 req_schp->dio_in_use = 1;
1728 hp->info |= SG_INFO_DIRECT_IO;
1729 }
1730 }
1731 return res;
1732 }
1733
1734 static int sg_finish_rem_req(Sg_request * srp)
1735 {
1736 int ret = 0;
1737
1738 Sg_fd *sfp = srp->parentfp;
1739 Sg_scatter_hold *req_schp = &srp->data;
1740
1741 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1742 if (srp->rq) {
1743 if (srp->bio)
1744 ret = blk_rq_unmap_user(srp->bio);
1745
1746 blk_put_request(srp->rq);
1747 }
1748
1749 if (srp->res_used)
1750 sg_unlink_reserve(sfp, srp);
1751 else
1752 sg_remove_scat(req_schp);
1753
1754 sg_remove_request(sfp, srp);
1755
1756 return ret;
1757 }
1758
1759 static int
1760 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1761 {
1762 int sg_bufflen = tablesize * sizeof(struct page *);
1763 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1764
1765 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1766 if (!schp->pages)
1767 return -ENOMEM;
1768 schp->sglist_len = sg_bufflen;
1769 return tablesize; /* number of scat_gath elements allocated */
1770 }
1771
1772 static int
1773 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1774 {
1775 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1776 int sg_tablesize = sfp->parentdp->sg_tablesize;
1777 int blk_size = buff_size, order;
1778 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1779
1780 if (blk_size < 0)
1781 return -EFAULT;
1782 if (0 == blk_size)
1783 ++blk_size; /* don't know why */
1784 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1785 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1786 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1787 buff_size, blk_size));
1788
1789 /* N.B. ret_sz carried into this block ... */
1790 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1791 if (mx_sc_elems < 0)
1792 return mx_sc_elems; /* most likely -ENOMEM */
1793
1794 num = scatter_elem_sz;
1795 if (unlikely(num != scatter_elem_sz_prev)) {
1796 if (num < PAGE_SIZE) {
1797 scatter_elem_sz = PAGE_SIZE;
1798 scatter_elem_sz_prev = PAGE_SIZE;
1799 } else
1800 scatter_elem_sz_prev = num;
1801 }
1802
1803 if (sfp->low_dma)
1804 gfp_mask |= GFP_DMA;
1805
1806 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1807 gfp_mask |= __GFP_ZERO;
1808
1809 order = get_order(num);
1810 retry:
1811 ret_sz = 1 << (PAGE_SHIFT + order);
1812
1813 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1814 k++, rem_sz -= ret_sz) {
1815
1816 num = (rem_sz > scatter_elem_sz_prev) ?
1817 scatter_elem_sz_prev : rem_sz;
1818
1819 schp->pages[k] = alloc_pages(gfp_mask, order);
1820 if (!schp->pages[k])
1821 goto out;
1822
1823 if (num == scatter_elem_sz_prev) {
1824 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1825 scatter_elem_sz = ret_sz;
1826 scatter_elem_sz_prev = ret_sz;
1827 }
1828 }
1829
1830 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1831 "ret_sz=%d\n", k, num, ret_sz));
1832 } /* end of for loop */
1833
1834 schp->page_order = order;
1835 schp->k_use_sg = k;
1836 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1837 "rem_sz=%d\n", k, rem_sz));
1838
1839 schp->bufflen = blk_size;
1840 if (rem_sz > 0) /* must have failed */
1841 return -ENOMEM;
1842 return 0;
1843 out:
1844 for (i = 0; i < k; i++)
1845 __free_pages(schp->pages[i], order);
1846
1847 if (--order >= 0)
1848 goto retry;
1849
1850 return -ENOMEM;
1851 }
1852
1853 static void
1854 sg_remove_scat(Sg_scatter_hold * schp)
1855 {
1856 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1857 if (schp->pages && schp->sglist_len > 0) {
1858 if (!schp->dio_in_use) {
1859 int k;
1860
1861 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1862 SCSI_LOG_TIMEOUT(5, printk(
1863 "sg_remove_scat: k=%d, pg=0x%p\n",
1864 k, schp->pages[k]));
1865 __free_pages(schp->pages[k], schp->page_order);
1866 }
1867
1868 kfree(schp->pages);
1869 }
1870 }
1871 memset(schp, 0, sizeof (*schp));
1872 }
1873
1874 static int
1875 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1876 {
1877 Sg_scatter_hold *schp = &srp->data;
1878 int k, num;
1879
1880 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1881 num_read_xfer));
1882 if ((!outp) || (num_read_xfer <= 0))
1883 return 0;
1884
1885 num = 1 << (PAGE_SHIFT + schp->page_order);
1886 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1887 if (num > num_read_xfer) {
1888 if (__copy_to_user(outp, page_address(schp->pages[k]),
1889 num_read_xfer))
1890 return -EFAULT;
1891 break;
1892 } else {
1893 if (__copy_to_user(outp, page_address(schp->pages[k]),
1894 num))
1895 return -EFAULT;
1896 num_read_xfer -= num;
1897 if (num_read_xfer <= 0)
1898 break;
1899 outp += num;
1900 }
1901 }
1902
1903 return 0;
1904 }
1905
1906 static void
1907 sg_build_reserve(Sg_fd * sfp, int req_size)
1908 {
1909 Sg_scatter_hold *schp = &sfp->reserve;
1910
1911 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1912 do {
1913 if (req_size < PAGE_SIZE)
1914 req_size = PAGE_SIZE;
1915 if (0 == sg_build_indirect(schp, sfp, req_size))
1916 return;
1917 else
1918 sg_remove_scat(schp);
1919 req_size >>= 1; /* divide by 2 */
1920 } while (req_size > (PAGE_SIZE / 2));
1921 }
1922
1923 static void
1924 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1925 {
1926 Sg_scatter_hold *req_schp = &srp->data;
1927 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1928 int k, num, rem;
1929
1930 srp->res_used = 1;
1931 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1932 rem = size;
1933
1934 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1935 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1936 if (rem <= num) {
1937 req_schp->k_use_sg = k + 1;
1938 req_schp->sglist_len = rsv_schp->sglist_len;
1939 req_schp->pages = rsv_schp->pages;
1940
1941 req_schp->bufflen = size;
1942 req_schp->page_order = rsv_schp->page_order;
1943 break;
1944 } else
1945 rem -= num;
1946 }
1947
1948 if (k >= rsv_schp->k_use_sg)
1949 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1950 }
1951
1952 static void
1953 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1954 {
1955 Sg_scatter_hold *req_schp = &srp->data;
1956
1957 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1958 (int) req_schp->k_use_sg));
1959 req_schp->k_use_sg = 0;
1960 req_schp->bufflen = 0;
1961 req_schp->pages = NULL;
1962 req_schp->page_order = 0;
1963 req_schp->sglist_len = 0;
1964 sfp->save_scat_len = 0;
1965 srp->res_used = 0;
1966 }
1967
1968 static Sg_request *
1969 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1970 {
1971 Sg_request *resp;
1972 unsigned long iflags;
1973
1974 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1975 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1976 /* look for requests that are ready + not SG_IO owned */
1977 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1978 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1979 resp->done = 2; /* guard against other readers */
1980 break;
1981 }
1982 }
1983 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1984 return resp;
1985 }
1986
1987 /* always adds to end of list */
1988 static Sg_request *
1989 sg_add_request(Sg_fd * sfp)
1990 {
1991 int k;
1992 unsigned long iflags;
1993 Sg_request *resp;
1994 Sg_request *rp = sfp->req_arr;
1995
1996 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1997 resp = sfp->headrp;
1998 if (!resp) {
1999 memset(rp, 0, sizeof (Sg_request));
2000 rp->parentfp = sfp;
2001 resp = rp;
2002 sfp->headrp = resp;
2003 } else {
2004 if (0 == sfp->cmd_q)
2005 resp = NULL; /* command queuing disallowed */
2006 else {
2007 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2008 if (!rp->parentfp)
2009 break;
2010 }
2011 if (k < SG_MAX_QUEUE) {
2012 memset(rp, 0, sizeof (Sg_request));
2013 rp->parentfp = sfp;
2014 while (resp->nextrp)
2015 resp = resp->nextrp;
2016 resp->nextrp = rp;
2017 resp = rp;
2018 } else
2019 resp = NULL;
2020 }
2021 }
2022 if (resp) {
2023 resp->nextrp = NULL;
2024 resp->header.duration = jiffies_to_msecs(jiffies);
2025 }
2026 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2027 return resp;
2028 }
2029
2030 /* Return of 1 for found; 0 for not found */
2031 static int
2032 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2033 {
2034 Sg_request *prev_rp;
2035 Sg_request *rp;
2036 unsigned long iflags;
2037 int res = 0;
2038
2039 if ((!sfp) || (!srp) || (!sfp->headrp))
2040 return res;
2041 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2042 prev_rp = sfp->headrp;
2043 if (srp == prev_rp) {
2044 sfp->headrp = prev_rp->nextrp;
2045 prev_rp->parentfp = NULL;
2046 res = 1;
2047 } else {
2048 while ((rp = prev_rp->nextrp)) {
2049 if (srp == rp) {
2050 prev_rp->nextrp = rp->nextrp;
2051 rp->parentfp = NULL;
2052 res = 1;
2053 break;
2054 }
2055 prev_rp = rp;
2056 }
2057 }
2058 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2059 return res;
2060 }
2061
2062 static Sg_fd *
2063 sg_add_sfp(Sg_device * sdp, int dev)
2064 {
2065 Sg_fd *sfp;
2066 unsigned long iflags;
2067 int bufflen;
2068
2069 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2070 if (!sfp)
2071 return NULL;
2072
2073 init_waitqueue_head(&sfp->read_wait);
2074 rwlock_init(&sfp->rq_list_lock);
2075
2076 kref_init(&sfp->f_ref);
2077 sfp->timeout = SG_DEFAULT_TIMEOUT;
2078 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2079 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2080 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2081 sdp->device->host->unchecked_isa_dma : 1;
2082 sfp->cmd_q = SG_DEF_COMMAND_Q;
2083 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2084 sfp->parentdp = sdp;
2085 write_lock_irqsave(&sg_index_lock, iflags);
2086 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2087 write_unlock_irqrestore(&sg_index_lock, iflags);
2088 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2089 if (unlikely(sg_big_buff != def_reserved_size))
2090 sg_big_buff = def_reserved_size;
2091
2092 bufflen = min_t(int, sg_big_buff,
2093 queue_max_sectors(sdp->device->request_queue) * 512);
2094 sg_build_reserve(sfp, bufflen);
2095 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2096 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2097
2098 kref_get(&sdp->d_ref);
2099 __module_get(THIS_MODULE);
2100 return sfp;
2101 }
2102
2103 static void sg_remove_sfp_usercontext(struct work_struct *work)
2104 {
2105 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2106 struct sg_device *sdp = sfp->parentdp;
2107
2108 /* Cleanup any responses which were never read(). */
2109 while (sfp->headrp)
2110 sg_finish_rem_req(sfp->headrp);
2111
2112 if (sfp->reserve.bufflen > 0) {
2113 SCSI_LOG_TIMEOUT(6,
2114 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2115 (int) sfp->reserve.bufflen,
2116 (int) sfp->reserve.k_use_sg));
2117 sg_remove_scat(&sfp->reserve);
2118 }
2119
2120 SCSI_LOG_TIMEOUT(6,
2121 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2122 sdp->disk->disk_name,
2123 sfp));
2124 kfree(sfp);
2125
2126 scsi_device_put(sdp->device);
2127 sg_put_dev(sdp);
2128 module_put(THIS_MODULE);
2129 }
2130
2131 static void sg_remove_sfp(struct kref *kref)
2132 {
2133 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2134 struct sg_device *sdp = sfp->parentdp;
2135 unsigned long iflags;
2136
2137 write_lock_irqsave(&sg_index_lock, iflags);
2138 list_del(&sfp->sfd_siblings);
2139 write_unlock_irqrestore(&sg_index_lock, iflags);
2140 wake_up_interruptible(&sdp->o_excl_wait);
2141
2142 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2143 schedule_work(&sfp->ew.work);
2144 }
2145
2146 static int
2147 sg_res_in_use(Sg_fd * sfp)
2148 {
2149 const Sg_request *srp;
2150 unsigned long iflags;
2151
2152 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2153 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2154 if (srp->res_used)
2155 break;
2156 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2157 return srp ? 1 : 0;
2158 }
2159
2160 #ifdef CONFIG_SCSI_PROC_FS
2161 static int
2162 sg_idr_max_id(int id, void *p, void *data)
2163 {
2164 int *k = data;
2165
2166 if (*k < id)
2167 *k = id;
2168
2169 return 0;
2170 }
2171
2172 static int
2173 sg_last_dev(void)
2174 {
2175 int k = -1;
2176 unsigned long iflags;
2177
2178 read_lock_irqsave(&sg_index_lock, iflags);
2179 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2180 read_unlock_irqrestore(&sg_index_lock, iflags);
2181 return k + 1; /* origin 1 */
2182 }
2183 #endif
2184
2185 /* must be called with sg_index_lock held */
2186 static Sg_device *sg_lookup_dev(int dev)
2187 {
2188 return idr_find(&sg_index_idr, dev);
2189 }
2190
2191 static Sg_device *sg_get_dev(int dev)
2192 {
2193 struct sg_device *sdp;
2194 unsigned long flags;
2195
2196 read_lock_irqsave(&sg_index_lock, flags);
2197 sdp = sg_lookup_dev(dev);
2198 if (!sdp)
2199 sdp = ERR_PTR(-ENXIO);
2200 else if (sdp->detached) {
2201 /* If sdp->detached, then the refcount may already be 0, in
2202 * which case it would be a bug to do kref_get().
2203 */
2204 sdp = ERR_PTR(-ENODEV);
2205 } else
2206 kref_get(&sdp->d_ref);
2207 read_unlock_irqrestore(&sg_index_lock, flags);
2208
2209 return sdp;
2210 }
2211
2212 static void sg_put_dev(struct sg_device *sdp)
2213 {
2214 kref_put(&sdp->d_ref, sg_device_destroy);
2215 }
2216
2217 #ifdef CONFIG_SCSI_PROC_FS
2218
2219 static struct proc_dir_entry *sg_proc_sgp = NULL;
2220
2221 static char sg_proc_sg_dirname[] = "scsi/sg";
2222
2223 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2224
2225 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2226 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2227 size_t count, loff_t *off);
2228 static const struct file_operations adio_fops = {
2229 .owner = THIS_MODULE,
2230 .open = sg_proc_single_open_adio,
2231 .read = seq_read,
2232 .llseek = seq_lseek,
2233 .write = sg_proc_write_adio,
2234 .release = single_release,
2235 };
2236
2237 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2238 static ssize_t sg_proc_write_dressz(struct file *filp,
2239 const char __user *buffer, size_t count, loff_t *off);
2240 static const struct file_operations dressz_fops = {
2241 .owner = THIS_MODULE,
2242 .open = sg_proc_single_open_dressz,
2243 .read = seq_read,
2244 .llseek = seq_lseek,
2245 .write = sg_proc_write_dressz,
2246 .release = single_release,
2247 };
2248
2249 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2250 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2251 static const struct file_operations version_fops = {
2252 .owner = THIS_MODULE,
2253 .open = sg_proc_single_open_version,
2254 .read = seq_read,
2255 .llseek = seq_lseek,
2256 .release = single_release,
2257 };
2258
2259 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2260 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2261 static const struct file_operations devhdr_fops = {
2262 .owner = THIS_MODULE,
2263 .open = sg_proc_single_open_devhdr,
2264 .read = seq_read,
2265 .llseek = seq_lseek,
2266 .release = single_release,
2267 };
2268
2269 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2270 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2271 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2272 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2273 static void dev_seq_stop(struct seq_file *s, void *v);
2274 static const struct file_operations dev_fops = {
2275 .owner = THIS_MODULE,
2276 .open = sg_proc_open_dev,
2277 .read = seq_read,
2278 .llseek = seq_lseek,
2279 .release = seq_release,
2280 };
2281 static const struct seq_operations dev_seq_ops = {
2282 .start = dev_seq_start,
2283 .next = dev_seq_next,
2284 .stop = dev_seq_stop,
2285 .show = sg_proc_seq_show_dev,
2286 };
2287
2288 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2289 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2290 static const struct file_operations devstrs_fops = {
2291 .owner = THIS_MODULE,
2292 .open = sg_proc_open_devstrs,
2293 .read = seq_read,
2294 .llseek = seq_lseek,
2295 .release = seq_release,
2296 };
2297 static const struct seq_operations devstrs_seq_ops = {
2298 .start = dev_seq_start,
2299 .next = dev_seq_next,
2300 .stop = dev_seq_stop,
2301 .show = sg_proc_seq_show_devstrs,
2302 };
2303
2304 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2305 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2306 static const struct file_operations debug_fops = {
2307 .owner = THIS_MODULE,
2308 .open = sg_proc_open_debug,
2309 .read = seq_read,
2310 .llseek = seq_lseek,
2311 .release = seq_release,
2312 };
2313 static const struct seq_operations debug_seq_ops = {
2314 .start = dev_seq_start,
2315 .next = dev_seq_next,
2316 .stop = dev_seq_stop,
2317 .show = sg_proc_seq_show_debug,
2318 };
2319
2320
2321 struct sg_proc_leaf {
2322 const char * name;
2323 const struct file_operations * fops;
2324 };
2325
2326 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2327 {"allow_dio", &adio_fops},
2328 {"debug", &debug_fops},
2329 {"def_reserved_size", &dressz_fops},
2330 {"device_hdr", &devhdr_fops},
2331 {"devices", &dev_fops},
2332 {"device_strs", &devstrs_fops},
2333 {"version", &version_fops}
2334 };
2335
2336 static int
2337 sg_proc_init(void)
2338 {
2339 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2340 int k;
2341
2342 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2343 if (!sg_proc_sgp)
2344 return 1;
2345 for (k = 0; k < num_leaves; ++k) {
2346 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2347 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2348 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2349 }
2350 return 0;
2351 }
2352
2353 static void
2354 sg_proc_cleanup(void)
2355 {
2356 int k;
2357 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2358
2359 if (!sg_proc_sgp)
2360 return;
2361 for (k = 0; k < num_leaves; ++k)
2362 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2363 remove_proc_entry(sg_proc_sg_dirname, NULL);
2364 }
2365
2366
2367 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2368 {
2369 seq_printf(s, "%d\n", *((int *)s->private));
2370 return 0;
2371 }
2372
2373 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2374 {
2375 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2376 }
2377
2378 static ssize_t
2379 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2380 size_t count, loff_t *off)
2381 {
2382 int err;
2383 unsigned long num;
2384
2385 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2386 return -EACCES;
2387 err = kstrtoul_from_user(buffer, count, 0, &num);
2388 if (err)
2389 return err;
2390 sg_allow_dio = num ? 1 : 0;
2391 return count;
2392 }
2393
2394 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2395 {
2396 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2397 }
2398
2399 static ssize_t
2400 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2401 size_t count, loff_t *off)
2402 {
2403 int err;
2404 unsigned long k = ULONG_MAX;
2405
2406 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2407 return -EACCES;
2408
2409 err = kstrtoul_from_user(buffer, count, 0, &k);
2410 if (err)
2411 return err;
2412 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2413 sg_big_buff = k;
2414 return count;
2415 }
2416 return -ERANGE;
2417 }
2418
2419 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2420 {
2421 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2422 sg_version_date);
2423 return 0;
2424 }
2425
2426 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2427 {
2428 return single_open(file, sg_proc_seq_show_version, NULL);
2429 }
2430
2431 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2432 {
2433 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2434 "online\n");
2435 return 0;
2436 }
2437
2438 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2439 {
2440 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2441 }
2442
2443 struct sg_proc_deviter {
2444 loff_t index;
2445 size_t max;
2446 };
2447
2448 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2449 {
2450 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2451
2452 s->private = it;
2453 if (! it)
2454 return NULL;
2455
2456 it->index = *pos;
2457 it->max = sg_last_dev();
2458 if (it->index >= it->max)
2459 return NULL;
2460 return it;
2461 }
2462
2463 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2464 {
2465 struct sg_proc_deviter * it = s->private;
2466
2467 *pos = ++it->index;
2468 return (it->index < it->max) ? it : NULL;
2469 }
2470
2471 static void dev_seq_stop(struct seq_file *s, void *v)
2472 {
2473 kfree(s->private);
2474 }
2475
2476 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2477 {
2478 return seq_open(file, &dev_seq_ops);
2479 }
2480
2481 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2482 {
2483 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2484 Sg_device *sdp;
2485 struct scsi_device *scsidp;
2486 unsigned long iflags;
2487
2488 read_lock_irqsave(&sg_index_lock, iflags);
2489 sdp = it ? sg_lookup_dev(it->index) : NULL;
2490 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2491 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2492 scsidp->host->host_no, scsidp->channel,
2493 scsidp->id, scsidp->lun, (int) scsidp->type,
2494 1,
2495 (int) scsidp->queue_depth,
2496 (int) scsidp->device_busy,
2497 (int) scsi_device_online(scsidp));
2498 else
2499 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2500 read_unlock_irqrestore(&sg_index_lock, iflags);
2501 return 0;
2502 }
2503
2504 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2505 {
2506 return seq_open(file, &devstrs_seq_ops);
2507 }
2508
2509 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2510 {
2511 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2512 Sg_device *sdp;
2513 struct scsi_device *scsidp;
2514 unsigned long iflags;
2515
2516 read_lock_irqsave(&sg_index_lock, iflags);
2517 sdp = it ? sg_lookup_dev(it->index) : NULL;
2518 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2519 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2520 scsidp->vendor, scsidp->model, scsidp->rev);
2521 else
2522 seq_printf(s, "<no active device>\n");
2523 read_unlock_irqrestore(&sg_index_lock, iflags);
2524 return 0;
2525 }
2526
2527 /* must be called while holding sg_index_lock */
2528 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2529 {
2530 int k, m, new_interface, blen, usg;
2531 Sg_request *srp;
2532 Sg_fd *fp;
2533 const sg_io_hdr_t *hp;
2534 const char * cp;
2535 unsigned int ms;
2536
2537 k = 0;
2538 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2539 k++;
2540 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2541 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2542 "(res)sgat=%d low_dma=%d\n", k,
2543 jiffies_to_msecs(fp->timeout),
2544 fp->reserve.bufflen,
2545 (int) fp->reserve.k_use_sg,
2546 (int) fp->low_dma);
2547 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2548 (int) fp->cmd_q, (int) fp->force_packid,
2549 (int) fp->keep_orphan);
2550 for (m = 0, srp = fp->headrp;
2551 srp != NULL;
2552 ++m, srp = srp->nextrp) {
2553 hp = &srp->header;
2554 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2555 if (srp->res_used) {
2556 if (new_interface &&
2557 (SG_FLAG_MMAP_IO & hp->flags))
2558 cp = " mmap>> ";
2559 else
2560 cp = " rb>> ";
2561 } else {
2562 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2563 cp = " dio>> ";
2564 else
2565 cp = " ";
2566 }
2567 seq_printf(s, cp);
2568 blen = srp->data.bufflen;
2569 usg = srp->data.k_use_sg;
2570 seq_printf(s, srp->done ?
2571 ((1 == srp->done) ? "rcv:" : "fin:")
2572 : "act:");
2573 seq_printf(s, " id=%d blen=%d",
2574 srp->header.pack_id, blen);
2575 if (srp->done)
2576 seq_printf(s, " dur=%d", hp->duration);
2577 else {
2578 ms = jiffies_to_msecs(jiffies);
2579 seq_printf(s, " t_o/elap=%d/%d",
2580 (new_interface ? hp->timeout :
2581 jiffies_to_msecs(fp->timeout)),
2582 (ms > hp->duration ? ms - hp->duration : 0));
2583 }
2584 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2585 (int) srp->data.cmd_opcode);
2586 }
2587 if (0 == m)
2588 seq_printf(s, " No requests active\n");
2589 read_unlock(&fp->rq_list_lock);
2590 }
2591 }
2592
2593 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2594 {
2595 return seq_open(file, &debug_seq_ops);
2596 }
2597
2598 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2599 {
2600 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2601 Sg_device *sdp;
2602 unsigned long iflags;
2603
2604 if (it && (0 == it->index)) {
2605 seq_printf(s, "max_active_device=%d(origin 1)\n",
2606 (int)it->max);
2607 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2608 }
2609
2610 read_lock_irqsave(&sg_index_lock, iflags);
2611 sdp = it ? sg_lookup_dev(it->index) : NULL;
2612 if (sdp && !list_empty(&sdp->sfds)) {
2613 struct scsi_device *scsidp = sdp->device;
2614
2615 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2616 if (sdp->detached)
2617 seq_printf(s, "detached pending close ");
2618 else
2619 seq_printf
2620 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2621 scsidp->host->host_no,
2622 scsidp->channel, scsidp->id,
2623 scsidp->lun,
2624 scsidp->host->hostt->emulated);
2625 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2626 sdp->sg_tablesize, get_exclude(sdp));
2627 sg_proc_debug_helper(s, sdp);
2628 }
2629 read_unlock_irqrestore(&sg_index_lock, iflags);
2630 return 0;
2631 }
2632
2633 #endif /* CONFIG_SCSI_PROC_FS */
2634
2635 module_init(init_sg);
2636 module_exit(exit_sg);
Linux with added FPC-III support