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sg: incorporate sg_build_direct into sg_start_req
[linux-2.6/verdex.git] / drivers / scsi / sg.c
blobc0b6866eece965b747b55c448b9d049620cec6fb
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/errno.h>
39 #include <linux/mtio.h>
40 #include <linux/ioctl.h>
41 #include <linux/fcntl.h>
42 #include <linux/init.h>
43 #include <linux/poll.h>
44 #include <linux/moduleparam.h>
45 #include <linux/cdev.h>
46 #include <linux/idr.h>
47 #include <linux/seq_file.h>
48 #include <linux/blkdev.h>
49 #include <linux/delay.h>
50 #include <linux/blktrace_api.h>
51 #include <linux/smp_lock.h>
52
53 #include "scsi.h"
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_host.h>
56 #include <scsi/scsi_driver.h>
57 #include <scsi/scsi_ioctl.h>
58 #include <scsi/sg.h>
59
60 #include "scsi_logging.h"
61
62 #ifdef CONFIG_SCSI_PROC_FS
63 #include <linux/proc_fs.h>
64 static char *sg_version_date = "20061027";
65
66 static int sg_proc_init(void);
67 static void sg_proc_cleanup(void);
68 #endif
69
70 #define SG_ALLOW_DIO_DEF 0
71
72 #define SG_MAX_DEVS 32768
73
74 /*
75 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
76 * Then when using 32 bit integers x * m may overflow during the calculation.
77 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
78 * calculates the same, but prevents the overflow when both m and d
79 * are "small" numbers (like HZ and USER_HZ).
80 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
81 * in 32 bits.
82 */
83 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
84
85 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
86
87 int sg_big_buff = SG_DEF_RESERVED_SIZE;
88 /* N.B. This variable is readable and writeable via
89 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
90 of this size (or less if there is not enough memory) will be reserved
91 for use by this file descriptor. [Deprecated usage: this variable is also
92 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
93 the kernel (i.e. it is not a module).] */
94 static int def_reserved_size = -1; /* picks up init parameter */
95 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
96
97 static int scatter_elem_sz = SG_SCATTER_SZ;
98 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
99
100 #define SG_SECTOR_SZ 512
101 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
102
103 static int sg_add(struct device *, struct class_interface *);
104 static void sg_remove(struct device *, struct class_interface *);
105
106 static DEFINE_IDR(sg_index_idr);
107 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
108 file descriptor list for device */
109
110 static struct class_interface sg_interface = {
111 .add_dev = sg_add,
112 .remove_dev = sg_remove,
113 };
114
115 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
116 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
117 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
118 unsigned bufflen; /* Size of (aggregate) data buffer */
119 struct page **pages;
120 int page_order;
121 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
122 unsigned char cmd_opcode; /* first byte of command */
123 } Sg_scatter_hold;
124
125 struct sg_device; /* forward declarations */
126 struct sg_fd;
127
128 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
129 struct sg_request *nextrp; /* NULL -> tail request (slist) */
130 struct sg_fd *parentfp; /* NULL -> not in use */
131 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
132 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
133 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
134 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
135 char orphan; /* 1 -> drop on sight, 0 -> normal */
136 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
137 volatile char done; /* 0->before bh, 1->before read, 2->read */
138 struct request *rq;
139 struct bio *bio;
140 } Sg_request;
141
142 typedef struct sg_fd { /* holds the state of a file descriptor */
143 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
144 struct sg_device *parentdp; /* owning device */
145 wait_queue_head_t read_wait; /* queue read until command done */
146 rwlock_t rq_list_lock; /* protect access to list in req_arr */
147 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
148 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
149 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
150 unsigned save_scat_len; /* original length of trunc. scat. element */
151 Sg_request *headrp; /* head of request slist, NULL->empty */
152 struct fasync_struct *async_qp; /* used by asynchronous notification */
153 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
154 char low_dma; /* as in parent but possibly overridden to 1 */
155 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
156 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
157 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
158 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
159 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
160 char mmap_called; /* 0 -> mmap() never called on this fd */
161 } Sg_fd;
162
163 typedef struct sg_device { /* holds the state of each scsi generic device */
164 struct scsi_device *device;
165 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
166 int sg_tablesize; /* adapter's max scatter-gather table size */
167 u32 index; /* device index number */
168 Sg_fd *headfp; /* first open fd belonging to this device */
169 volatile char detached; /* 0->attached, 1->detached pending removal */
170 volatile char exclude; /* opened for exclusive access */
171 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
172 struct gendisk *disk;
173 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
174 } Sg_device;
175
176 static int sg_fasync(int fd, struct file *filp, int mode);
177 /* tasklet or soft irq callback */
178 static void sg_rq_end_io(struct request *rq, int uptodate);
179 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
180 static void sg_finish_rem_req(Sg_request * srp);
181 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
182 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
183 int tablesize);
184 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
185 Sg_request * srp);
186 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
187 const char __user *buf, size_t count, int blocking,
188 int read_only, Sg_request **o_srp);
189 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
190 unsigned char *cmnd, int timeout, int blocking);
191 static int sg_write_xfer(Sg_request * srp);
192 static int sg_read_xfer(Sg_request * srp);
193 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
194 static void sg_remove_scat(Sg_scatter_hold * schp);
195 static void sg_build_reserve(Sg_fd * sfp, int req_size);
196 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
197 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
198 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
199 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
200 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
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 #ifdef CONFIG_SCSI_PROC_FS
207 static int sg_last_dev(void);
208 #endif
209
210 #define SZ_SG_HEADER sizeof(struct sg_header)
211 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
212 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
213 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
214
215 static int sg_allow_access(struct file *filp, unsigned char *cmd)
216 {
217 struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
218 struct request_queue *q = sfp->parentdp->device->request_queue;
219
220 if (sfp->parentdp->device->type == TYPE_SCANNER)
221 return 0;
222
223 return blk_verify_command(&q->cmd_filter,
224 cmd, filp->f_mode & FMODE_WRITE);
225 }
226
227 static int
228 sg_open(struct inode *inode, struct file *filp)
229 {
230 int dev = iminor(inode);
231 int flags = filp->f_flags;
232 struct request_queue *q;
233 Sg_device *sdp;
234 Sg_fd *sfp;
235 int res;
236 int retval;
237
238 lock_kernel();
239 nonseekable_open(inode, filp);
240 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
241 sdp = sg_get_dev(dev);
242 if ((!sdp) || (!sdp->device)) {
243 unlock_kernel();
244 return -ENXIO;
245 }
246 if (sdp->detached) {
247 unlock_kernel();
248 return -ENODEV;
249 }
250
251 /* This driver's module count bumped by fops_get in <linux/fs.h> */
252 /* Prevent the device driver from vanishing while we sleep */
253 retval = scsi_device_get(sdp->device);
254 if (retval) {
255 unlock_kernel();
256 return retval;
257 }
258
259 if (!((flags & O_NONBLOCK) ||
260 scsi_block_when_processing_errors(sdp->device))) {
261 retval = -ENXIO;
262 /* we are in error recovery for this device */
263 goto error_out;
264 }
265
266 if (flags & O_EXCL) {
267 if (O_RDONLY == (flags & O_ACCMODE)) {
268 retval = -EPERM; /* Can't lock it with read only access */
269 goto error_out;
270 }
271 if (sdp->headfp && (flags & O_NONBLOCK)) {
272 retval = -EBUSY;
273 goto error_out;
274 }
275 res = 0;
276 __wait_event_interruptible(sdp->o_excl_wait,
277 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
278 if (res) {
279 retval = res; /* -ERESTARTSYS because signal hit process */
280 goto error_out;
281 }
282 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
283 if (flags & O_NONBLOCK) {
284 retval = -EBUSY;
285 goto error_out;
286 }
287 res = 0;
288 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
289 res);
290 if (res) {
291 retval = res; /* -ERESTARTSYS because signal hit process */
292 goto error_out;
293 }
294 }
295 if (sdp->detached) {
296 retval = -ENODEV;
297 goto error_out;
298 }
299 if (!sdp->headfp) { /* no existing opens on this device */
300 sdp->sgdebug = 0;
301 q = sdp->device->request_queue;
302 sdp->sg_tablesize = min(q->max_hw_segments,
303 q->max_phys_segments);
304 }
305 if ((sfp = sg_add_sfp(sdp, dev)))
306 filp->private_data = sfp;
307 else {
308 if (flags & O_EXCL)
309 sdp->exclude = 0; /* undo if error */
310 retval = -ENOMEM;
311 goto error_out;
312 }
313 unlock_kernel();
314 return 0;
315
316 error_out:
317 scsi_device_put(sdp->device);
318 unlock_kernel();
319 return retval;
320 }
321
322 /* Following function was formerly called 'sg_close' */
323 static int
324 sg_release(struct inode *inode, struct file *filp)
325 {
326 Sg_device *sdp;
327 Sg_fd *sfp;
328
329 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
330 return -ENXIO;
331 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
332 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
333 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
334 if (!sdp->detached) {
335 scsi_device_put(sdp->device);
336 }
337 sdp->exclude = 0;
338 wake_up_interruptible(&sdp->o_excl_wait);
339 }
340 return 0;
341 }
342
343 static ssize_t
344 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
345 {
346 Sg_device *sdp;
347 Sg_fd *sfp;
348 Sg_request *srp;
349 int req_pack_id = -1;
350 sg_io_hdr_t *hp;
351 struct sg_header *old_hdr = NULL;
352 int retval = 0;
353
354 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
355 return -ENXIO;
356 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
357 sdp->disk->disk_name, (int) count));
358
359 if (!access_ok(VERIFY_WRITE, buf, count))
360 return -EFAULT;
361 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
362 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
363 if (!old_hdr)
364 return -ENOMEM;
365 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
366 retval = -EFAULT;
367 goto free_old_hdr;
368 }
369 if (old_hdr->reply_len < 0) {
370 if (count >= SZ_SG_IO_HDR) {
371 sg_io_hdr_t *new_hdr;
372 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
373 if (!new_hdr) {
374 retval = -ENOMEM;
375 goto free_old_hdr;
376 }
377 retval =__copy_from_user
378 (new_hdr, buf, SZ_SG_IO_HDR);
379 req_pack_id = new_hdr->pack_id;
380 kfree(new_hdr);
381 if (retval) {
382 retval = -EFAULT;
383 goto free_old_hdr;
384 }
385 }
386 } else
387 req_pack_id = old_hdr->pack_id;
388 }
389 srp = sg_get_rq_mark(sfp, req_pack_id);
390 if (!srp) { /* now wait on packet to arrive */
391 if (sdp->detached) {
392 retval = -ENODEV;
393 goto free_old_hdr;
394 }
395 if (filp->f_flags & O_NONBLOCK) {
396 retval = -EAGAIN;
397 goto free_old_hdr;
398 }
399 while (1) {
400 retval = 0; /* following macro beats race condition */
401 __wait_event_interruptible(sfp->read_wait,
402 (sdp->detached ||
403 (srp = sg_get_rq_mark(sfp, req_pack_id))),
404 retval);
405 if (sdp->detached) {
406 retval = -ENODEV;
407 goto free_old_hdr;
408 }
409 if (0 == retval)
410 break;
411
412 /* -ERESTARTSYS as signal hit process */
413 goto free_old_hdr;
414 }
415 }
416 if (srp->header.interface_id != '\0') {
417 retval = sg_new_read(sfp, buf, count, srp);
418 goto free_old_hdr;
419 }
420
421 hp = &srp->header;
422 if (old_hdr == NULL) {
423 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
424 if (! old_hdr) {
425 retval = -ENOMEM;
426 goto free_old_hdr;
427 }
428 }
429 memset(old_hdr, 0, SZ_SG_HEADER);
430 old_hdr->reply_len = (int) hp->timeout;
431 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
432 old_hdr->pack_id = hp->pack_id;
433 old_hdr->twelve_byte =
434 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
435 old_hdr->target_status = hp->masked_status;
436 old_hdr->host_status = hp->host_status;
437 old_hdr->driver_status = hp->driver_status;
438 if ((CHECK_CONDITION & hp->masked_status) ||
439 (DRIVER_SENSE & hp->driver_status))
440 memcpy(old_hdr->sense_buffer, srp->sense_b,
441 sizeof (old_hdr->sense_buffer));
442 switch (hp->host_status) {
443 /* This setup of 'result' is for backward compatibility and is best
444 ignored by the user who should use target, host + driver status */
445 case DID_OK:
446 case DID_PASSTHROUGH:
447 case DID_SOFT_ERROR:
448 old_hdr->result = 0;
449 break;
450 case DID_NO_CONNECT:
451 case DID_BUS_BUSY:
452 case DID_TIME_OUT:
453 old_hdr->result = EBUSY;
454 break;
455 case DID_BAD_TARGET:
456 case DID_ABORT:
457 case DID_PARITY:
458 case DID_RESET:
459 case DID_BAD_INTR:
460 old_hdr->result = EIO;
461 break;
462 case DID_ERROR:
463 old_hdr->result = (srp->sense_b[0] == 0 &&
464 hp->masked_status == GOOD) ? 0 : EIO;
465 break;
466 default:
467 old_hdr->result = EIO;
468 break;
469 }
470
471 /* Now copy the result back to the user buffer. */
472 if (count >= SZ_SG_HEADER) {
473 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
474 retval = -EFAULT;
475 goto free_old_hdr;
476 }
477 buf += SZ_SG_HEADER;
478 if (count > old_hdr->reply_len)
479 count = old_hdr->reply_len;
480 if (count > SZ_SG_HEADER) {
481 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
482 retval = -EFAULT;
483 goto free_old_hdr;
484 }
485 }
486 } else
487 count = (old_hdr->result == 0) ? 0 : -EIO;
488 sg_finish_rem_req(srp);
489 retval = count;
490 free_old_hdr:
491 kfree(old_hdr);
492 return retval;
493 }
494
495 static ssize_t
496 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
497 {
498 sg_io_hdr_t *hp = &srp->header;
499 int err = 0;
500 int len;
501
502 if (count < SZ_SG_IO_HDR) {
503 err = -EINVAL;
504 goto err_out;
505 }
506 hp->sb_len_wr = 0;
507 if ((hp->mx_sb_len > 0) && hp->sbp) {
508 if ((CHECK_CONDITION & hp->masked_status) ||
509 (DRIVER_SENSE & hp->driver_status)) {
510 int sb_len = SCSI_SENSE_BUFFERSIZE;
511 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
512 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
513 len = (len > sb_len) ? sb_len : len;
514 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
515 err = -EFAULT;
516 goto err_out;
517 }
518 hp->sb_len_wr = len;
519 }
520 }
521 if (hp->masked_status || hp->host_status || hp->driver_status)
522 hp->info |= SG_INFO_CHECK;
523 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
524 err = -EFAULT;
525 goto err_out;
526 }
527 err = sg_read_xfer(srp);
528 err_out:
529 sg_finish_rem_req(srp);
530 return (0 == err) ? count : err;
531 }
532
533 static ssize_t
534 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
535 {
536 int mxsize, cmd_size, k;
537 int input_size, blocking;
538 unsigned char opcode;
539 Sg_device *sdp;
540 Sg_fd *sfp;
541 Sg_request *srp;
542 struct sg_header old_hdr;
543 sg_io_hdr_t *hp;
544 unsigned char cmnd[MAX_COMMAND_SIZE];
545
546 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
547 return -ENXIO;
548 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
549 sdp->disk->disk_name, (int) count));
550 if (sdp->detached)
551 return -ENODEV;
552 if (!((filp->f_flags & O_NONBLOCK) ||
553 scsi_block_when_processing_errors(sdp->device)))
554 return -ENXIO;
555
556 if (!access_ok(VERIFY_READ, buf, count))
557 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
558 if (count < SZ_SG_HEADER)
559 return -EIO;
560 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
561 return -EFAULT;
562 blocking = !(filp->f_flags & O_NONBLOCK);
563 if (old_hdr.reply_len < 0)
564 return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL);
565 if (count < (SZ_SG_HEADER + 6))
566 return -EIO; /* The minimum scsi command length is 6 bytes. */
567
568 if (!(srp = sg_add_request(sfp))) {
569 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
570 return -EDOM;
571 }
572 buf += SZ_SG_HEADER;
573 __get_user(opcode, buf);
574 if (sfp->next_cmd_len > 0) {
575 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
576 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
577 sfp->next_cmd_len = 0;
578 sg_remove_request(sfp, srp);
579 return -EIO;
580 }
581 cmd_size = sfp->next_cmd_len;
582 sfp->next_cmd_len = 0; /* reset so only this write() effected */
583 } else {
584 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
585 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
586 cmd_size = 12;
587 }
588 SCSI_LOG_TIMEOUT(4, printk(
589 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
590 /* Determine buffer size. */
591 input_size = count - cmd_size;
592 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
593 mxsize -= SZ_SG_HEADER;
594 input_size -= SZ_SG_HEADER;
595 if (input_size < 0) {
596 sg_remove_request(sfp, srp);
597 return -EIO; /* User did not pass enough bytes for this command. */
598 }
599 hp = &srp->header;
600 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
601 hp->cmd_len = (unsigned char) cmd_size;
602 hp->iovec_count = 0;
603 hp->mx_sb_len = 0;
604 if (input_size > 0)
605 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
606 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
607 else
608 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
609 hp->dxfer_len = mxsize;
610 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
611 hp->dxferp = (char __user *)buf + cmd_size;
612 else
613 hp->dxferp = NULL;
614 hp->sbp = NULL;
615 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
616 hp->flags = input_size; /* structure abuse ... */
617 hp->pack_id = old_hdr.pack_id;
618 hp->usr_ptr = NULL;
619 if (__copy_from_user(cmnd, buf, cmd_size))
620 return -EFAULT;
621 /*
622 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
623 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
624 * is a non-zero input_size, so emit a warning.
625 */
626 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
627 static char cmd[TASK_COMM_LEN];
628 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
629 printk(KERN_WARNING
630 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
631 "guessing data in;\n" KERN_WARNING " "
632 "program %s not setting count and/or reply_len properly\n",
633 old_hdr.reply_len - (int)SZ_SG_HEADER,
634 input_size, (unsigned int) cmnd[0],
635 current->comm);
636 strcpy(cmd, current->comm);
637 }
638 }
639 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
640 return (k < 0) ? k : count;
641 }
642
643 static ssize_t
644 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
645 size_t count, int blocking, int read_only,
646 Sg_request **o_srp)
647 {
648 int k;
649 Sg_request *srp;
650 sg_io_hdr_t *hp;
651 unsigned char cmnd[MAX_COMMAND_SIZE];
652 int timeout;
653 unsigned long ul_timeout;
654
655 if (count < SZ_SG_IO_HDR)
656 return -EINVAL;
657 if (!access_ok(VERIFY_READ, buf, count))
658 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
659
660 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
661 if (!(srp = sg_add_request(sfp))) {
662 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
663 return -EDOM;
664 }
665 hp = &srp->header;
666 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
667 sg_remove_request(sfp, srp);
668 return -EFAULT;
669 }
670 if (hp->interface_id != 'S') {
671 sg_remove_request(sfp, srp);
672 return -ENOSYS;
673 }
674 if (hp->flags & SG_FLAG_MMAP_IO) {
675 if (hp->dxfer_len > sfp->reserve.bufflen) {
676 sg_remove_request(sfp, srp);
677 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
678 }
679 if (hp->flags & SG_FLAG_DIRECT_IO) {
680 sg_remove_request(sfp, srp);
681 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
682 }
683 if (sg_res_in_use(sfp)) {
684 sg_remove_request(sfp, srp);
685 return -EBUSY; /* reserve buffer already being used */
686 }
687 }
688 ul_timeout = msecs_to_jiffies(srp->header.timeout);
689 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
690 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
691 sg_remove_request(sfp, srp);
692 return -EMSGSIZE;
693 }
694 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
695 sg_remove_request(sfp, srp);
696 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
697 }
698 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
699 sg_remove_request(sfp, srp);
700 return -EFAULT;
701 }
702 if (read_only && sg_allow_access(file, cmnd)) {
703 sg_remove_request(sfp, srp);
704 return -EPERM;
705 }
706 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
707 if (k < 0)
708 return k;
709 if (o_srp)
710 *o_srp = srp;
711 return count;
712 }
713
714 static int
715 sg_common_write(Sg_fd * sfp, Sg_request * srp,
716 unsigned char *cmnd, int timeout, int blocking)
717 {
718 int k, data_dir;
719 Sg_device *sdp = sfp->parentdp;
720 sg_io_hdr_t *hp = &srp->header;
721
722 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
723 hp->status = 0;
724 hp->masked_status = 0;
725 hp->msg_status = 0;
726 hp->info = 0;
727 hp->host_status = 0;
728 hp->driver_status = 0;
729 hp->resid = 0;
730 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
731 (int) cmnd[0], (int) hp->cmd_len));
732
733 k = sg_start_req(srp, cmnd);
734 if (k) {
735 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
736 sg_finish_rem_req(srp);
737 return k; /* probably out of space --> ENOMEM */
738 }
739 if ((k = sg_write_xfer(srp))) {
740 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
741 sg_finish_rem_req(srp);
742 return k;
743 }
744 if (sdp->detached) {
745 sg_finish_rem_req(srp);
746 return -ENODEV;
747 }
748
749 switch (hp->dxfer_direction) {
750 case SG_DXFER_TO_FROM_DEV:
751 case SG_DXFER_FROM_DEV:
752 data_dir = DMA_FROM_DEVICE;
753 break;
754 case SG_DXFER_TO_DEV:
755 data_dir = DMA_TO_DEVICE;
756 break;
757 case SG_DXFER_UNKNOWN:
758 data_dir = DMA_BIDIRECTIONAL;
759 break;
760 default:
761 data_dir = DMA_NONE;
762 break;
763 }
764 hp->duration = jiffies_to_msecs(jiffies);
765
766 srp->rq->timeout = timeout;
767 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
768 srp->rq, 1, sg_rq_end_io);
769 return 0;
770 }
771
772 static int
773 sg_srp_done(Sg_request *srp, Sg_fd *sfp)
774 {
775 unsigned long iflags;
776 int done;
777
778 read_lock_irqsave(&sfp->rq_list_lock, iflags);
779 done = srp->done;
780 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
781 return done;
782 }
783
784 static int
785 sg_ioctl(struct inode *inode, struct file *filp,
786 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 {
806 int blocking = 1; /* ignore O_NONBLOCK flag */
807
808 if (sdp->detached)
809 return -ENODEV;
810 if (!scsi_block_when_processing_errors(sdp->device))
811 return -ENXIO;
812 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
813 return -EFAULT;
814 result =
815 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
816 blocking, read_only, &srp);
817 if (result < 0)
818 return result;
819 srp->sg_io_owned = 1;
820 while (1) {
821 result = 0; /* following macro to beat race condition */
822 __wait_event_interruptible(sfp->read_wait,
823 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
824 result);
825 if (sdp->detached)
826 return -ENODEV;
827 if (sfp->closed)
828 return 0; /* request packet dropped already */
829 if (0 == result)
830 break;
831 srp->orphan = 1;
832 return result; /* -ERESTARTSYS because signal hit process */
833 }
834 write_lock_irqsave(&sfp->rq_list_lock, iflags);
835 srp->done = 2;
836 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
837 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
838 return (result < 0) ? result : 0;
839 }
840 case SG_SET_TIMEOUT:
841 result = get_user(val, ip);
842 if (result)
843 return result;
844 if (val < 0)
845 return -EIO;
846 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
847 val = MULDIV (INT_MAX, USER_HZ, HZ);
848 sfp->timeout_user = val;
849 sfp->timeout = MULDIV (val, HZ, USER_HZ);
850
851 return 0;
852 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
853 /* strange ..., for backward compatibility */
854 return sfp->timeout_user;
855 case SG_SET_FORCE_LOW_DMA:
856 result = get_user(val, ip);
857 if (result)
858 return result;
859 if (val) {
860 sfp->low_dma = 1;
861 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
862 val = (int) sfp->reserve.bufflen;
863 sg_remove_scat(&sfp->reserve);
864 sg_build_reserve(sfp, val);
865 }
866 } else {
867 if (sdp->detached)
868 return -ENODEV;
869 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
870 }
871 return 0;
872 case SG_GET_LOW_DMA:
873 return put_user((int) sfp->low_dma, ip);
874 case SG_GET_SCSI_ID:
875 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
876 return -EFAULT;
877 else {
878 sg_scsi_id_t __user *sg_idp = p;
879
880 if (sdp->detached)
881 return -ENODEV;
882 __put_user((int) sdp->device->host->host_no,
883 &sg_idp->host_no);
884 __put_user((int) sdp->device->channel,
885 &sg_idp->channel);
886 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
887 __put_user((int) sdp->device->lun, &sg_idp->lun);
888 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
889 __put_user((short) sdp->device->host->cmd_per_lun,
890 &sg_idp->h_cmd_per_lun);
891 __put_user((short) sdp->device->queue_depth,
892 &sg_idp->d_queue_depth);
893 __put_user(0, &sg_idp->unused[0]);
894 __put_user(0, &sg_idp->unused[1]);
895 return 0;
896 }
897 case SG_SET_FORCE_PACK_ID:
898 result = get_user(val, ip);
899 if (result)
900 return result;
901 sfp->force_packid = val ? 1 : 0;
902 return 0;
903 case SG_GET_PACK_ID:
904 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
905 return -EFAULT;
906 read_lock_irqsave(&sfp->rq_list_lock, iflags);
907 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
908 if ((1 == srp->done) && (!srp->sg_io_owned)) {
909 read_unlock_irqrestore(&sfp->rq_list_lock,
910 iflags);
911 __put_user(srp->header.pack_id, ip);
912 return 0;
913 }
914 }
915 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
916 __put_user(-1, ip);
917 return 0;
918 case SG_GET_NUM_WAITING:
919 read_lock_irqsave(&sfp->rq_list_lock, iflags);
920 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
921 if ((1 == srp->done) && (!srp->sg_io_owned))
922 ++val;
923 }
924 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
925 return put_user(val, ip);
926 case SG_GET_SG_TABLESIZE:
927 return put_user(sdp->sg_tablesize, ip);
928 case SG_SET_RESERVED_SIZE:
929 result = get_user(val, ip);
930 if (result)
931 return result;
932 if (val < 0)
933 return -EINVAL;
934 val = min_t(int, val,
935 sdp->device->request_queue->max_sectors * 512);
936 if (val != sfp->reserve.bufflen) {
937 if (sg_res_in_use(sfp) || sfp->mmap_called)
938 return -EBUSY;
939 sg_remove_scat(&sfp->reserve);
940 sg_build_reserve(sfp, val);
941 }
942 return 0;
943 case SG_GET_RESERVED_SIZE:
944 val = min_t(int, sfp->reserve.bufflen,
945 sdp->device->request_queue->max_sectors * 512);
946 return put_user(val, ip);
947 case SG_SET_COMMAND_Q:
948 result = get_user(val, ip);
949 if (result)
950 return result;
951 sfp->cmd_q = val ? 1 : 0;
952 return 0;
953 case SG_GET_COMMAND_Q:
954 return put_user((int) sfp->cmd_q, ip);
955 case SG_SET_KEEP_ORPHAN:
956 result = get_user(val, ip);
957 if (result)
958 return result;
959 sfp->keep_orphan = val;
960 return 0;
961 case SG_GET_KEEP_ORPHAN:
962 return put_user((int) sfp->keep_orphan, ip);
963 case SG_NEXT_CMD_LEN:
964 result = get_user(val, ip);
965 if (result)
966 return result;
967 sfp->next_cmd_len = (val > 0) ? val : 0;
968 return 0;
969 case SG_GET_VERSION_NUM:
970 return put_user(sg_version_num, ip);
971 case SG_GET_ACCESS_COUNT:
972 /* faked - we don't have a real access count anymore */
973 val = (sdp->device ? 1 : 0);
974 return put_user(val, ip);
975 case SG_GET_REQUEST_TABLE:
976 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
977 return -EFAULT;
978 else {
979 sg_req_info_t *rinfo;
980 unsigned int ms;
981
982 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
983 GFP_KERNEL);
984 if (!rinfo)
985 return -ENOMEM;
986 read_lock_irqsave(&sfp->rq_list_lock, iflags);
987 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
988 ++val, srp = srp ? srp->nextrp : srp) {
989 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
990 if (srp) {
991 rinfo[val].req_state = srp->done + 1;
992 rinfo[val].problem =
993 srp->header.masked_status &
994 srp->header.host_status &
995 srp->header.driver_status;
996 if (srp->done)
997 rinfo[val].duration =
998 srp->header.duration;
999 else {
1000 ms = jiffies_to_msecs(jiffies);
1001 rinfo[val].duration =
1002 (ms > srp->header.duration) ?
1003 (ms - srp->header.duration) : 0;
1004 }
1005 rinfo[val].orphan = srp->orphan;
1006 rinfo[val].sg_io_owned =
1007 srp->sg_io_owned;
1008 rinfo[val].pack_id =
1009 srp->header.pack_id;
1010 rinfo[val].usr_ptr =
1011 srp->header.usr_ptr;
1012 }
1013 }
1014 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1015 result = __copy_to_user(p, rinfo,
1016 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1017 result = result ? -EFAULT : 0;
1018 kfree(rinfo);
1019 return result;
1020 }
1021 case SG_EMULATED_HOST:
1022 if (sdp->detached)
1023 return -ENODEV;
1024 return put_user(sdp->device->host->hostt->emulated, ip);
1025 case SG_SCSI_RESET:
1026 if (sdp->detached)
1027 return -ENODEV;
1028 if (filp->f_flags & O_NONBLOCK) {
1029 if (scsi_host_in_recovery(sdp->device->host))
1030 return -EBUSY;
1031 } else if (!scsi_block_when_processing_errors(sdp->device))
1032 return -EBUSY;
1033 result = get_user(val, ip);
1034 if (result)
1035 return result;
1036 if (SG_SCSI_RESET_NOTHING == val)
1037 return 0;
1038 switch (val) {
1039 case SG_SCSI_RESET_DEVICE:
1040 val = SCSI_TRY_RESET_DEVICE;
1041 break;
1042 case SG_SCSI_RESET_TARGET:
1043 val = SCSI_TRY_RESET_TARGET;
1044 break;
1045 case SG_SCSI_RESET_BUS:
1046 val = SCSI_TRY_RESET_BUS;
1047 break;
1048 case SG_SCSI_RESET_HOST:
1049 val = SCSI_TRY_RESET_HOST;
1050 break;
1051 default:
1052 return -EINVAL;
1053 }
1054 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1055 return -EACCES;
1056 return (scsi_reset_provider(sdp->device, val) ==
1057 SUCCESS) ? 0 : -EIO;
1058 case SCSI_IOCTL_SEND_COMMAND:
1059 if (sdp->detached)
1060 return -ENODEV;
1061 if (read_only) {
1062 unsigned char opcode = WRITE_6;
1063 Scsi_Ioctl_Command __user *siocp = p;
1064
1065 if (copy_from_user(&opcode, siocp->data, 1))
1066 return -EFAULT;
1067 if (sg_allow_access(filp, &opcode))
1068 return -EPERM;
1069 }
1070 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
1071 case SG_SET_DEBUG:
1072 result = get_user(val, ip);
1073 if (result)
1074 return result;
1075 sdp->sgdebug = (char) val;
1076 return 0;
1077 case SCSI_IOCTL_GET_IDLUN:
1078 case SCSI_IOCTL_GET_BUS_NUMBER:
1079 case SCSI_IOCTL_PROBE_HOST:
1080 case SG_GET_TRANSFORM:
1081 if (sdp->detached)
1082 return -ENODEV;
1083 return scsi_ioctl(sdp->device, cmd_in, p);
1084 case BLKSECTGET:
1085 return put_user(sdp->device->request_queue->max_sectors * 512,
1086 ip);
1087 case BLKTRACESETUP:
1088 return blk_trace_setup(sdp->device->request_queue,
1089 sdp->disk->disk_name,
1090 sdp->device->sdev_gendev.devt,
1091 (char *)arg);
1092 case BLKTRACESTART:
1093 return blk_trace_startstop(sdp->device->request_queue, 1);
1094 case BLKTRACESTOP:
1095 return blk_trace_startstop(sdp->device->request_queue, 0);
1096 case BLKTRACETEARDOWN:
1097 return blk_trace_remove(sdp->device->request_queue);
1098 default:
1099 if (read_only)
1100 return -EPERM; /* don't know so take safe approach */
1101 return scsi_ioctl(sdp->device, cmd_in, p);
1102 }
1103 }
1104
1105 #ifdef CONFIG_COMPAT
1106 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1107 {
1108 Sg_device *sdp;
1109 Sg_fd *sfp;
1110 struct scsi_device *sdev;
1111
1112 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1113 return -ENXIO;
1114
1115 sdev = sdp->device;
1116 if (sdev->host->hostt->compat_ioctl) {
1117 int ret;
1118
1119 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1120
1121 return ret;
1122 }
1123
1124 return -ENOIOCTLCMD;
1125 }
1126 #endif
1127
1128 static unsigned int
1129 sg_poll(struct file *filp, poll_table * wait)
1130 {
1131 unsigned int res = 0;
1132 Sg_device *sdp;
1133 Sg_fd *sfp;
1134 Sg_request *srp;
1135 int count = 0;
1136 unsigned long iflags;
1137
1138 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1139 || sfp->closed)
1140 return POLLERR;
1141 poll_wait(filp, &sfp->read_wait, wait);
1142 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1143 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1144 /* if any read waiting, flag it */
1145 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1146 res = POLLIN | POLLRDNORM;
1147 ++count;
1148 }
1149 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1150
1151 if (sdp->detached)
1152 res |= POLLHUP;
1153 else if (!sfp->cmd_q) {
1154 if (0 == count)
1155 res |= POLLOUT | POLLWRNORM;
1156 } else if (count < SG_MAX_QUEUE)
1157 res |= POLLOUT | POLLWRNORM;
1158 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1159 sdp->disk->disk_name, (int) res));
1160 return res;
1161 }
1162
1163 static int
1164 sg_fasync(int fd, struct file *filp, int mode)
1165 {
1166 int retval;
1167 Sg_device *sdp;
1168 Sg_fd *sfp;
1169
1170 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1171 return -ENXIO;
1172 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1173 sdp->disk->disk_name, mode));
1174
1175 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1176 return (retval < 0) ? retval : 0;
1177 }
1178
1179 static int
1180 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1181 {
1182 Sg_fd *sfp;
1183 unsigned long offset, len, sa;
1184 Sg_scatter_hold *rsv_schp;
1185 int k, length;
1186
1187 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1188 return VM_FAULT_SIGBUS;
1189 rsv_schp = &sfp->reserve;
1190 offset = vmf->pgoff << PAGE_SHIFT;
1191 if (offset >= rsv_schp->bufflen)
1192 return VM_FAULT_SIGBUS;
1193 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1194 offset, rsv_schp->k_use_sg));
1195 sa = vma->vm_start;
1196 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1197 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1198 len = vma->vm_end - sa;
1199 len = (len < length) ? len : length;
1200 if (offset < len) {
1201 struct page *page = nth_page(rsv_schp->pages[k],
1202 offset >> PAGE_SHIFT);
1203 get_page(page); /* increment page count */
1204 vmf->page = page;
1205 return 0; /* success */
1206 }
1207 sa += len;
1208 offset -= len;
1209 }
1210
1211 return VM_FAULT_SIGBUS;
1212 }
1213
1214 static struct vm_operations_struct sg_mmap_vm_ops = {
1215 .fault = sg_vma_fault,
1216 };
1217
1218 static int
1219 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1220 {
1221 Sg_fd *sfp;
1222 unsigned long req_sz, len, sa;
1223 Sg_scatter_hold *rsv_schp;
1224 int k, length;
1225
1226 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1227 return -ENXIO;
1228 req_sz = vma->vm_end - vma->vm_start;
1229 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1230 (void *) vma->vm_start, (int) req_sz));
1231 if (vma->vm_pgoff)
1232 return -EINVAL; /* want no offset */
1233 rsv_schp = &sfp->reserve;
1234 if (req_sz > rsv_schp->bufflen)
1235 return -ENOMEM; /* cannot map more than reserved buffer */
1236
1237 sa = vma->vm_start;
1238 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1239 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1240 len = vma->vm_end - sa;
1241 len = (len < length) ? len : length;
1242 sa += len;
1243 }
1244
1245 sfp->mmap_called = 1;
1246 vma->vm_flags |= VM_RESERVED;
1247 vma->vm_private_data = sfp;
1248 vma->vm_ops = &sg_mmap_vm_ops;
1249 return 0;
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 = NULL;
1260 Sg_fd *sfp;
1261 unsigned long iflags;
1262 unsigned int ms;
1263 char *sense;
1264 int result, resid;
1265
1266 if (NULL == srp) {
1267 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1268 return;
1269 }
1270 sfp = srp->parentfp;
1271 if (sfp)
1272 sdp = sfp->parentdp;
1273 if ((NULL == sdp) || sdp->detached) {
1274 printk(KERN_INFO "sg_cmd_done: device detached\n");
1275 return;
1276 }
1277
1278 sense = rq->sense;
1279 result = rq->errors;
1280 resid = rq->data_len;
1281
1282 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1283 sdp->disk->disk_name, srp->header.pack_id, result));
1284 srp->header.resid = resid;
1285 ms = jiffies_to_msecs(jiffies);
1286 srp->header.duration = (ms > srp->header.duration) ?
1287 (ms - srp->header.duration) : 0;
1288 if (0 != result) {
1289 struct scsi_sense_hdr sshdr;
1290
1291 srp->header.status = 0xff & result;
1292 srp->header.masked_status = status_byte(result);
1293 srp->header.msg_status = msg_byte(result);
1294 srp->header.host_status = host_byte(result);
1295 srp->header.driver_status = driver_byte(result);
1296 if ((sdp->sgdebug > 0) &&
1297 ((CHECK_CONDITION == srp->header.masked_status) ||
1298 (COMMAND_TERMINATED == srp->header.masked_status)))
1299 __scsi_print_sense("sg_cmd_done", sense,
1300 SCSI_SENSE_BUFFERSIZE);
1301
1302 /* Following if statement is a patch supplied by Eric Youngdale */
1303 if (driver_byte(result) != 0
1304 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1305 && !scsi_sense_is_deferred(&sshdr)
1306 && sshdr.sense_key == UNIT_ATTENTION
1307 && sdp->device->removable) {
1308 /* Detected possible disc change. Set the bit - this */
1309 /* may be used if there are filesystems using this device */
1310 sdp->device->changed = 1;
1311 }
1312 }
1313 /* Rely on write phase to clean out srp status values, so no "else" */
1314
1315 if (sfp->closed) { /* whoops this fd already released, cleanup */
1316 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1317 sg_finish_rem_req(srp);
1318 srp = NULL;
1319 if (NULL == sfp->headrp) {
1320 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
1321 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1322 scsi_device_put(sdp->device);
1323 }
1324 sfp = NULL;
1325 }
1326 } else if (srp && srp->orphan) {
1327 if (sfp->keep_orphan)
1328 srp->sg_io_owned = 0;
1329 else {
1330 sg_finish_rem_req(srp);
1331 srp = NULL;
1332 }
1333 }
1334 if (sfp && srp) {
1335 /* Now wake up any sg_read() that is waiting for this packet. */
1336 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1337 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1338 srp->done = 1;
1339 wake_up_interruptible(&sfp->read_wait);
1340 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1341 }
1342 }
1343
1344 static struct file_operations sg_fops = {
1345 .owner = THIS_MODULE,
1346 .read = sg_read,
1347 .write = sg_write,
1348 .poll = sg_poll,
1349 .ioctl = sg_ioctl,
1350 #ifdef CONFIG_COMPAT
1351 .compat_ioctl = sg_compat_ioctl,
1352 #endif
1353 .open = sg_open,
1354 .mmap = sg_mmap,
1355 .release = sg_release,
1356 .fasync = sg_fasync,
1357 };
1358
1359 static struct class *sg_sysfs_class;
1360
1361 static int sg_sysfs_valid = 0;
1362
1363 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1364 {
1365 struct request_queue *q = scsidp->request_queue;
1366 Sg_device *sdp;
1367 unsigned long iflags;
1368 int error;
1369 u32 k;
1370
1371 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1372 if (!sdp) {
1373 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1374 return ERR_PTR(-ENOMEM);
1375 }
1376 error = -ENOMEM;
1377 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1378 printk(KERN_WARNING "idr expansion Sg_device failure\n");
1379 goto out;
1380 }
1381
1382 write_lock_irqsave(&sg_index_lock, iflags);
1383 error = idr_get_new(&sg_index_idr, sdp, &k);
1384 write_unlock_irqrestore(&sg_index_lock, iflags);
1385
1386 if (error) {
1387 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1388 error);
1389 goto out;
1390 }
1391
1392 if (unlikely(k >= SG_MAX_DEVS))
1393 goto overflow;
1394
1395 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1396 sprintf(disk->disk_name, "sg%d", k);
1397 disk->first_minor = k;
1398 sdp->disk = disk;
1399 sdp->device = scsidp;
1400 init_waitqueue_head(&sdp->o_excl_wait);
1401 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
1402 sdp->index = k;
1403
1404 error = 0;
1405 out:
1406 if (error) {
1407 kfree(sdp);
1408 return ERR_PTR(error);
1409 }
1410 return sdp;
1411
1412 overflow:
1413 sdev_printk(KERN_WARNING, scsidp,
1414 "Unable to attach sg device type=%d, minor "
1415 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1416 error = -ENODEV;
1417 goto out;
1418 }
1419
1420 static int
1421 sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1422 {
1423 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1424 struct gendisk *disk;
1425 Sg_device *sdp = NULL;
1426 struct cdev * cdev = NULL;
1427 int error;
1428 unsigned long iflags;
1429
1430 disk = alloc_disk(1);
1431 if (!disk) {
1432 printk(KERN_WARNING "alloc_disk failed\n");
1433 return -ENOMEM;
1434 }
1435 disk->major = SCSI_GENERIC_MAJOR;
1436
1437 error = -ENOMEM;
1438 cdev = cdev_alloc();
1439 if (!cdev) {
1440 printk(KERN_WARNING "cdev_alloc failed\n");
1441 goto out;
1442 }
1443 cdev->owner = THIS_MODULE;
1444 cdev->ops = &sg_fops;
1445
1446 sdp = sg_alloc(disk, scsidp);
1447 if (IS_ERR(sdp)) {
1448 printk(KERN_WARNING "sg_alloc failed\n");
1449 error = PTR_ERR(sdp);
1450 goto out;
1451 }
1452
1453 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1454 if (error)
1455 goto cdev_add_err;
1456
1457 sdp->cdev = cdev;
1458 if (sg_sysfs_valid) {
1459 struct device *sg_class_member;
1460
1461 sg_class_member = device_create_drvdata(sg_sysfs_class,
1462 cl_dev->parent,
1463 MKDEV(SCSI_GENERIC_MAJOR,
1464 sdp->index),
1465 sdp,
1466 "%s", disk->disk_name);
1467 if (IS_ERR(sg_class_member)) {
1468 printk(KERN_ERR "sg_add: "
1469 "device_create failed\n");
1470 error = PTR_ERR(sg_class_member);
1471 goto cdev_add_err;
1472 }
1473 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1474 &sg_class_member->kobj, "generic");
1475 if (error)
1476 printk(KERN_ERR "sg_add: unable to make symlink "
1477 "'generic' back to sg%d\n", sdp->index);
1478 } else
1479 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1480
1481 sdev_printk(KERN_NOTICE, scsidp,
1482 "Attached scsi generic sg%d type %d\n", sdp->index,
1483 scsidp->type);
1484
1485 dev_set_drvdata(cl_dev, sdp);
1486
1487 return 0;
1488
1489 cdev_add_err:
1490 write_lock_irqsave(&sg_index_lock, iflags);
1491 idr_remove(&sg_index_idr, sdp->index);
1492 write_unlock_irqrestore(&sg_index_lock, iflags);
1493 kfree(sdp);
1494
1495 out:
1496 put_disk(disk);
1497 if (cdev)
1498 cdev_del(cdev);
1499 return error;
1500 }
1501
1502 static void
1503 sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1504 {
1505 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1506 Sg_device *sdp = dev_get_drvdata(cl_dev);
1507 unsigned long iflags;
1508 Sg_fd *sfp;
1509 Sg_fd *tsfp;
1510 Sg_request *srp;
1511 Sg_request *tsrp;
1512 int delay;
1513
1514 if (!sdp)
1515 return;
1516
1517 delay = 0;
1518 write_lock_irqsave(&sg_index_lock, iflags);
1519 if (sdp->headfp) {
1520 sdp->detached = 1;
1521 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1522 tsfp = sfp->nextfp;
1523 for (srp = sfp->headrp; srp; srp = tsrp) {
1524 tsrp = srp->nextrp;
1525 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1526 sg_finish_rem_req(srp);
1527 }
1528 if (sfp->closed) {
1529 scsi_device_put(sdp->device);
1530 __sg_remove_sfp(sdp, sfp);
1531 } else {
1532 delay = 1;
1533 wake_up_interruptible(&sfp->read_wait);
1534 kill_fasync(&sfp->async_qp, SIGPOLL,
1535 POLL_HUP);
1536 }
1537 }
1538 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index));
1539 if (NULL == sdp->headfp) {
1540 idr_remove(&sg_index_idr, sdp->index);
1541 }
1542 } else { /* nothing active, simple case */
1543 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index));
1544 idr_remove(&sg_index_idr, sdp->index);
1545 }
1546 write_unlock_irqrestore(&sg_index_lock, iflags);
1547
1548 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1549 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1550 cdev_del(sdp->cdev);
1551 sdp->cdev = NULL;
1552 put_disk(sdp->disk);
1553 sdp->disk = NULL;
1554 if (NULL == sdp->headfp)
1555 kfree(sdp);
1556
1557 if (delay)
1558 msleep(10); /* dirty detach so delay device destruction */
1559 }
1560
1561 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1562 module_param_named(def_reserved_size, def_reserved_size, int,
1563 S_IRUGO | S_IWUSR);
1564 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1565
1566 MODULE_AUTHOR("Douglas Gilbert");
1567 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1568 MODULE_LICENSE("GPL");
1569 MODULE_VERSION(SG_VERSION_STR);
1570 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1571
1572 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1573 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1574 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1575 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1576
1577 static int __init
1578 init_sg(void)
1579 {
1580 int rc;
1581
1582 if (scatter_elem_sz < PAGE_SIZE) {
1583 scatter_elem_sz = PAGE_SIZE;
1584 scatter_elem_sz_prev = scatter_elem_sz;
1585 }
1586 if (def_reserved_size >= 0)
1587 sg_big_buff = def_reserved_size;
1588 else
1589 def_reserved_size = sg_big_buff;
1590
1591 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1592 SG_MAX_DEVS, "sg");
1593 if (rc)
1594 return rc;
1595 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1596 if ( IS_ERR(sg_sysfs_class) ) {
1597 rc = PTR_ERR(sg_sysfs_class);
1598 goto err_out;
1599 }
1600 sg_sysfs_valid = 1;
1601 rc = scsi_register_interface(&sg_interface);
1602 if (0 == rc) {
1603 #ifdef CONFIG_SCSI_PROC_FS
1604 sg_proc_init();
1605 #endif /* CONFIG_SCSI_PROC_FS */
1606 return 0;
1607 }
1608 class_destroy(sg_sysfs_class);
1609 err_out:
1610 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1611 return rc;
1612 }
1613
1614 static void __exit
1615 exit_sg(void)
1616 {
1617 #ifdef CONFIG_SCSI_PROC_FS
1618 sg_proc_cleanup();
1619 #endif /* CONFIG_SCSI_PROC_FS */
1620 scsi_unregister_interface(&sg_interface);
1621 class_destroy(sg_sysfs_class);
1622 sg_sysfs_valid = 0;
1623 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1624 SG_MAX_DEVS);
1625 idr_destroy(&sg_index_idr);
1626 }
1627
1628 static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1629 {
1630 int res;
1631 struct request *rq;
1632 Sg_fd *sfp = srp->parentfp;
1633 sg_io_hdr_t *hp = &srp->header;
1634 int dxfer_len = (int) hp->dxfer_len;
1635 int dxfer_dir = hp->dxfer_direction;
1636 unsigned int iov_count = hp->iovec_count;
1637 Sg_scatter_hold *req_schp = &srp->data;
1638 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1639 struct request_queue *q = sfp->parentdp->device->request_queue;
1640 struct rq_map_data *md, map_data;
1641 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1642
1643 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1644 dxfer_len));
1645
1646 rq = blk_get_request(q, rw, GFP_ATOMIC);
1647 if (!rq)
1648 return -ENOMEM;
1649
1650 memcpy(rq->cmd, cmd, hp->cmd_len);
1651
1652 rq->cmd_len = hp->cmd_len;
1653 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1654
1655 srp->rq = rq;
1656 rq->end_io_data = srp;
1657 rq->sense = srp->sense_b;
1658 rq->retries = SG_DEFAULT_RETRIES;
1659
1660 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1661 return 0;
1662
1663 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1664 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1665 !sfp->parentdp->device->host->unchecked_isa_dma &&
1666 blk_rq_aligned(q, hp->dxferp, dxfer_len))
1667 md = NULL;
1668 else
1669 md = &map_data;
1670
1671 if (md) {
1672 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1673 sg_link_reserve(sfp, srp, dxfer_len);
1674 else {
1675 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1676 if (res)
1677 return res;
1678 }
1679
1680 md->pages = req_schp->pages;
1681 md->page_order = req_schp->page_order;
1682 md->nr_entries = req_schp->k_use_sg;
1683 }
1684
1685 if (iov_count)
1686 res = blk_rq_map_user_iov(q, rq, md, hp->dxferp, iov_count,
1687 hp->dxfer_len, GFP_ATOMIC);
1688 else
1689 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1690 hp->dxfer_len, GFP_ATOMIC);
1691
1692 if (!res) {
1693 srp->bio = rq->bio;
1694
1695 if (!md) {
1696 req_schp->dio_in_use = 1;
1697 hp->info |= SG_INFO_DIRECT_IO;
1698 }
1699 }
1700 return res;
1701 }
1702
1703 static void
1704 sg_finish_rem_req(Sg_request * srp)
1705 {
1706 Sg_fd *sfp = srp->parentfp;
1707 Sg_scatter_hold *req_schp = &srp->data;
1708
1709 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1710 if (srp->res_used)
1711 sg_unlink_reserve(sfp, srp);
1712 else
1713 sg_remove_scat(req_schp);
1714
1715 if (srp->rq) {
1716 if (srp->bio)
1717 blk_rq_unmap_user(srp->bio);
1718
1719 blk_put_request(srp->rq);
1720 }
1721
1722 sg_remove_request(sfp, srp);
1723 }
1724
1725 static int
1726 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1727 {
1728 int sg_bufflen = tablesize * sizeof(struct page *);
1729 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1730
1731 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1732 if (!schp->pages)
1733 return -ENOMEM;
1734 schp->sglist_len = sg_bufflen;
1735 return tablesize; /* number of scat_gath elements allocated */
1736 }
1737
1738 static int
1739 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1740 {
1741 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1742 int sg_tablesize = sfp->parentdp->sg_tablesize;
1743 int blk_size = buff_size, order;
1744 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1745
1746 if (blk_size < 0)
1747 return -EFAULT;
1748 if (0 == blk_size)
1749 ++blk_size; /* don't know why */
1750 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1751 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1752 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1753 buff_size, blk_size));
1754
1755 /* N.B. ret_sz carried into this block ... */
1756 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1757 if (mx_sc_elems < 0)
1758 return mx_sc_elems; /* most likely -ENOMEM */
1759
1760 num = scatter_elem_sz;
1761 if (unlikely(num != scatter_elem_sz_prev)) {
1762 if (num < PAGE_SIZE) {
1763 scatter_elem_sz = PAGE_SIZE;
1764 scatter_elem_sz_prev = PAGE_SIZE;
1765 } else
1766 scatter_elem_sz_prev = num;
1767 }
1768
1769 if (sfp->low_dma)
1770 gfp_mask |= GFP_DMA;
1771
1772 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1773 gfp_mask |= __GFP_ZERO;
1774
1775 order = get_order(num);
1776 retry:
1777 ret_sz = 1 << (PAGE_SHIFT + order);
1778
1779 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1780 k++, rem_sz -= ret_sz) {
1781
1782 num = (rem_sz > scatter_elem_sz_prev) ?
1783 scatter_elem_sz_prev : rem_sz;
1784
1785 schp->pages[k] = alloc_pages(gfp_mask, order);
1786 if (!schp->pages[k])
1787 goto out;
1788
1789 if (num == scatter_elem_sz_prev) {
1790 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1791 scatter_elem_sz = ret_sz;
1792 scatter_elem_sz_prev = ret_sz;
1793 }
1794 }
1795
1796 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1797 "ret_sz=%d\n", k, num, ret_sz));
1798 } /* end of for loop */
1799
1800 schp->page_order = order;
1801 schp->k_use_sg = k;
1802 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1803 "rem_sz=%d\n", k, rem_sz));
1804
1805 schp->bufflen = blk_size;
1806 if (rem_sz > 0) /* must have failed */
1807 return -ENOMEM;
1808 return 0;
1809 out:
1810 for (i = 0; i < k; i++)
1811 __free_pages(schp->pages[k], order);
1812
1813 if (--order >= 0)
1814 goto retry;
1815
1816 return -ENOMEM;
1817 }
1818
1819 static int
1820 sg_write_xfer(Sg_request * srp)
1821 {
1822 sg_io_hdr_t *hp = &srp->header;
1823 Sg_scatter_hold *schp = &srp->data;
1824 int num_xfer = 0;
1825 int dxfer_dir = hp->dxfer_direction;
1826 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1827
1828 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1829 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1830 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1831 if (schp->bufflen < num_xfer)
1832 num_xfer = schp->bufflen;
1833 }
1834 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1835 (new_interface
1836 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1837 return 0;
1838
1839 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, k_use_sg=%d\n",
1840 num_xfer, schp->k_use_sg));
1841
1842 return 0;
1843 }
1844
1845 static void
1846 sg_remove_scat(Sg_scatter_hold * schp)
1847 {
1848 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1849 if (schp->pages && schp->sglist_len > 0) {
1850 if (!schp->dio_in_use) {
1851 int k;
1852
1853 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1854 SCSI_LOG_TIMEOUT(5, printk(
1855 "sg_remove_scat: k=%d, pg=0x%p\n",
1856 k, schp->pages[k]));
1857 __free_pages(schp->pages[k], schp->page_order);
1858 }
1859
1860 kfree(schp->pages);
1861 }
1862 }
1863 memset(schp, 0, sizeof (*schp));
1864 }
1865
1866 static int
1867 sg_read_xfer(Sg_request * srp)
1868 {
1869 sg_io_hdr_t *hp = &srp->header;
1870 Sg_scatter_hold *schp = &srp->data;
1871 int num_xfer = 0;
1872 int dxfer_dir = hp->dxfer_direction;
1873 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1874
1875 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
1876 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1877 num_xfer = hp->dxfer_len;
1878 if (schp->bufflen < num_xfer)
1879 num_xfer = schp->bufflen;
1880 }
1881 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1882 (new_interface
1883 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1884 return 0;
1885
1886 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1887 num_xfer, (int)hp->iovec_count, schp->k_use_sg));
1888 return 0;
1889 }
1890
1891 static int
1892 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1893 {
1894 Sg_scatter_hold *schp = &srp->data;
1895 int k, num;
1896
1897 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1898 num_read_xfer));
1899 if ((!outp) || (num_read_xfer <= 0))
1900 return 0;
1901
1902 blk_rq_unmap_user(srp->bio);
1903 srp->bio = NULL;
1904
1905 num = 1 << (PAGE_SHIFT + schp->page_order);
1906 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1907 if (num > num_read_xfer) {
1908 if (__copy_to_user(outp, page_address(schp->pages[k]),
1909 num_read_xfer))
1910 return -EFAULT;
1911 break;
1912 } else {
1913 if (__copy_to_user(outp, page_address(schp->pages[k]),
1914 num))
1915 return -EFAULT;
1916 num_read_xfer -= num;
1917 if (num_read_xfer <= 0)
1918 break;
1919 outp += num;
1920 }
1921 }
1922
1923 return 0;
1924 }
1925
1926 static void
1927 sg_build_reserve(Sg_fd * sfp, int req_size)
1928 {
1929 Sg_scatter_hold *schp = &sfp->reserve;
1930
1931 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1932 do {
1933 if (req_size < PAGE_SIZE)
1934 req_size = PAGE_SIZE;
1935 if (0 == sg_build_indirect(schp, sfp, req_size))
1936 return;
1937 else
1938 sg_remove_scat(schp);
1939 req_size >>= 1; /* divide by 2 */
1940 } while (req_size > (PAGE_SIZE / 2));
1941 }
1942
1943 static void
1944 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1945 {
1946 Sg_scatter_hold *req_schp = &srp->data;
1947 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1948 int k, num, rem;
1949
1950 srp->res_used = 1;
1951 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1952 rem = size;
1953
1954 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1955 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1956 if (rem <= num) {
1957 req_schp->k_use_sg = k + 1;
1958 req_schp->sglist_len = rsv_schp->sglist_len;
1959 req_schp->pages = rsv_schp->pages;
1960
1961 req_schp->bufflen = size;
1962 req_schp->page_order = rsv_schp->page_order;
1963 break;
1964 } else
1965 rem -= num;
1966 }
1967
1968 if (k >= rsv_schp->k_use_sg)
1969 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1970 }
1971
1972 static void
1973 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1974 {
1975 Sg_scatter_hold *req_schp = &srp->data;
1976
1977 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1978 (int) req_schp->k_use_sg));
1979 req_schp->k_use_sg = 0;
1980 req_schp->bufflen = 0;
1981 req_schp->pages = NULL;
1982 req_schp->page_order = 0;
1983 req_schp->sglist_len = 0;
1984 sfp->save_scat_len = 0;
1985 srp->res_used = 0;
1986 }
1987
1988 static Sg_request *
1989 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1990 {
1991 Sg_request *resp;
1992 unsigned long iflags;
1993
1994 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1995 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1996 /* look for requests that are ready + not SG_IO owned */
1997 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1998 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1999 resp->done = 2; /* guard against other readers */
2000 break;
2001 }
2002 }
2003 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2004 return resp;
2005 }
2006
2007 #ifdef CONFIG_SCSI_PROC_FS
2008 static Sg_request *
2009 sg_get_nth_request(Sg_fd * sfp, int nth)
2010 {
2011 Sg_request *resp;
2012 unsigned long iflags;
2013 int k;
2014
2015 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2016 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2017 ++k, resp = resp->nextrp) ;
2018 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2019 return resp;
2020 }
2021 #endif
2022
2023 /* always adds to end of list */
2024 static Sg_request *
2025 sg_add_request(Sg_fd * sfp)
2026 {
2027 int k;
2028 unsigned long iflags;
2029 Sg_request *resp;
2030 Sg_request *rp = sfp->req_arr;
2031
2032 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2033 resp = sfp->headrp;
2034 if (!resp) {
2035 memset(rp, 0, sizeof (Sg_request));
2036 rp->parentfp = sfp;
2037 resp = rp;
2038 sfp->headrp = resp;
2039 } else {
2040 if (0 == sfp->cmd_q)
2041 resp = NULL; /* command queuing disallowed */
2042 else {
2043 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2044 if (!rp->parentfp)
2045 break;
2046 }
2047 if (k < SG_MAX_QUEUE) {
2048 memset(rp, 0, sizeof (Sg_request));
2049 rp->parentfp = sfp;
2050 while (resp->nextrp)
2051 resp = resp->nextrp;
2052 resp->nextrp = rp;
2053 resp = rp;
2054 } else
2055 resp = NULL;
2056 }
2057 }
2058 if (resp) {
2059 resp->nextrp = NULL;
2060 resp->header.duration = jiffies_to_msecs(jiffies);
2061 }
2062 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2063 return resp;
2064 }
2065
2066 /* Return of 1 for found; 0 for not found */
2067 static int
2068 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2069 {
2070 Sg_request *prev_rp;
2071 Sg_request *rp;
2072 unsigned long iflags;
2073 int res = 0;
2074
2075 if ((!sfp) || (!srp) || (!sfp->headrp))
2076 return res;
2077 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2078 prev_rp = sfp->headrp;
2079 if (srp == prev_rp) {
2080 sfp->headrp = prev_rp->nextrp;
2081 prev_rp->parentfp = NULL;
2082 res = 1;
2083 } else {
2084 while ((rp = prev_rp->nextrp)) {
2085 if (srp == rp) {
2086 prev_rp->nextrp = rp->nextrp;
2087 rp->parentfp = NULL;
2088 res = 1;
2089 break;
2090 }
2091 prev_rp = rp;
2092 }
2093 }
2094 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2095 return res;
2096 }
2097
2098 #ifdef CONFIG_SCSI_PROC_FS
2099 static Sg_fd *
2100 sg_get_nth_sfp(Sg_device * sdp, int nth)
2101 {
2102 Sg_fd *resp;
2103 unsigned long iflags;
2104 int k;
2105
2106 read_lock_irqsave(&sg_index_lock, iflags);
2107 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2108 ++k, resp = resp->nextfp) ;
2109 read_unlock_irqrestore(&sg_index_lock, iflags);
2110 return resp;
2111 }
2112 #endif
2113
2114 static Sg_fd *
2115 sg_add_sfp(Sg_device * sdp, int dev)
2116 {
2117 Sg_fd *sfp;
2118 unsigned long iflags;
2119 int bufflen;
2120
2121 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2122 if (!sfp)
2123 return NULL;
2124
2125 init_waitqueue_head(&sfp->read_wait);
2126 rwlock_init(&sfp->rq_list_lock);
2127
2128 sfp->timeout = SG_DEFAULT_TIMEOUT;
2129 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2130 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2131 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2132 sdp->device->host->unchecked_isa_dma : 1;
2133 sfp->cmd_q = SG_DEF_COMMAND_Q;
2134 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2135 sfp->parentdp = sdp;
2136 write_lock_irqsave(&sg_index_lock, iflags);
2137 if (!sdp->headfp)
2138 sdp->headfp = sfp;
2139 else { /* add to tail of existing list */
2140 Sg_fd *pfp = sdp->headfp;
2141 while (pfp->nextfp)
2142 pfp = pfp->nextfp;
2143 pfp->nextfp = sfp;
2144 }
2145 write_unlock_irqrestore(&sg_index_lock, iflags);
2146 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2147 if (unlikely(sg_big_buff != def_reserved_size))
2148 sg_big_buff = def_reserved_size;
2149
2150 bufflen = min_t(int, sg_big_buff,
2151 sdp->device->request_queue->max_sectors * 512);
2152 sg_build_reserve(sfp, bufflen);
2153 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2154 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2155 return sfp;
2156 }
2157
2158 static void
2159 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2160 {
2161 Sg_fd *fp;
2162 Sg_fd *prev_fp;
2163
2164 prev_fp = sdp->headfp;
2165 if (sfp == prev_fp)
2166 sdp->headfp = prev_fp->nextfp;
2167 else {
2168 while ((fp = prev_fp->nextfp)) {
2169 if (sfp == fp) {
2170 prev_fp->nextfp = fp->nextfp;
2171 break;
2172 }
2173 prev_fp = fp;
2174 }
2175 }
2176 if (sfp->reserve.bufflen > 0) {
2177 SCSI_LOG_TIMEOUT(6,
2178 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2179 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2180 sg_remove_scat(&sfp->reserve);
2181 }
2182 sfp->parentdp = NULL;
2183 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2184 kfree(sfp);
2185 }
2186
2187 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2188 static int
2189 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2190 {
2191 Sg_request *srp;
2192 Sg_request *tsrp;
2193 int dirty = 0;
2194 int res = 0;
2195
2196 for (srp = sfp->headrp; srp; srp = tsrp) {
2197 tsrp = srp->nextrp;
2198 if (sg_srp_done(srp, sfp))
2199 sg_finish_rem_req(srp);
2200 else
2201 ++dirty;
2202 }
2203 if (0 == dirty) {
2204 unsigned long iflags;
2205
2206 write_lock_irqsave(&sg_index_lock, iflags);
2207 __sg_remove_sfp(sdp, sfp);
2208 if (sdp->detached && (NULL == sdp->headfp)) {
2209 idr_remove(&sg_index_idr, sdp->index);
2210 kfree(sdp);
2211 res = 1;
2212 }
2213 write_unlock_irqrestore(&sg_index_lock, iflags);
2214 } else {
2215 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2216 /* only bump the access_count if we actually succeeded in
2217 * throwing another counter on the host module */
2218 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2219 sfp->closed = 1; /* flag dirty state on this fd */
2220 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2221 dirty));
2222 }
2223 return res;
2224 }
2225
2226 static int
2227 sg_res_in_use(Sg_fd * sfp)
2228 {
2229 const Sg_request *srp;
2230 unsigned long iflags;
2231
2232 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2233 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2234 if (srp->res_used)
2235 break;
2236 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2237 return srp ? 1 : 0;
2238 }
2239
2240 #ifdef CONFIG_SCSI_PROC_FS
2241 static int
2242 sg_idr_max_id(int id, void *p, void *data)
2243 {
2244 int *k = data;
2245
2246 if (*k < id)
2247 *k = id;
2248
2249 return 0;
2250 }
2251
2252 static int
2253 sg_last_dev(void)
2254 {
2255 int k = -1;
2256 unsigned long iflags;
2257
2258 read_lock_irqsave(&sg_index_lock, iflags);
2259 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2260 read_unlock_irqrestore(&sg_index_lock, iflags);
2261 return k + 1; /* origin 1 */
2262 }
2263 #endif
2264
2265 static Sg_device *
2266 sg_get_dev(int dev)
2267 {
2268 Sg_device *sdp;
2269 unsigned long iflags;
2270
2271 read_lock_irqsave(&sg_index_lock, iflags);
2272 sdp = idr_find(&sg_index_idr, dev);
2273 read_unlock_irqrestore(&sg_index_lock, iflags);
2274
2275 return sdp;
2276 }
2277
2278 #ifdef CONFIG_SCSI_PROC_FS
2279
2280 static struct proc_dir_entry *sg_proc_sgp = NULL;
2281
2282 static char sg_proc_sg_dirname[] = "scsi/sg";
2283
2284 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2285
2286 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2287 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2288 size_t count, loff_t *off);
2289 static struct file_operations adio_fops = {
2290 /* .owner, .read and .llseek added in sg_proc_init() */
2291 .open = sg_proc_single_open_adio,
2292 .write = sg_proc_write_adio,
2293 .release = single_release,
2294 };
2295
2296 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2297 static ssize_t sg_proc_write_dressz(struct file *filp,
2298 const char __user *buffer, size_t count, loff_t *off);
2299 static struct file_operations dressz_fops = {
2300 .open = sg_proc_single_open_dressz,
2301 .write = sg_proc_write_dressz,
2302 .release = single_release,
2303 };
2304
2305 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2306 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2307 static struct file_operations version_fops = {
2308 .open = sg_proc_single_open_version,
2309 .release = single_release,
2310 };
2311
2312 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2313 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2314 static struct file_operations devhdr_fops = {
2315 .open = sg_proc_single_open_devhdr,
2316 .release = single_release,
2317 };
2318
2319 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2320 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2321 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2322 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2323 static void dev_seq_stop(struct seq_file *s, void *v);
2324 static struct file_operations dev_fops = {
2325 .open = sg_proc_open_dev,
2326 .release = seq_release,
2327 };
2328 static struct seq_operations dev_seq_ops = {
2329 .start = dev_seq_start,
2330 .next = dev_seq_next,
2331 .stop = dev_seq_stop,
2332 .show = sg_proc_seq_show_dev,
2333 };
2334
2335 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2336 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2337 static struct file_operations devstrs_fops = {
2338 .open = sg_proc_open_devstrs,
2339 .release = seq_release,
2340 };
2341 static struct seq_operations devstrs_seq_ops = {
2342 .start = dev_seq_start,
2343 .next = dev_seq_next,
2344 .stop = dev_seq_stop,
2345 .show = sg_proc_seq_show_devstrs,
2346 };
2347
2348 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2349 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2350 static struct file_operations debug_fops = {
2351 .open = sg_proc_open_debug,
2352 .release = seq_release,
2353 };
2354 static struct seq_operations debug_seq_ops = {
2355 .start = dev_seq_start,
2356 .next = dev_seq_next,
2357 .stop = dev_seq_stop,
2358 .show = sg_proc_seq_show_debug,
2359 };
2360
2361
2362 struct sg_proc_leaf {
2363 const char * name;
2364 struct file_operations * fops;
2365 };
2366
2367 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2368 {"allow_dio", &adio_fops},
2369 {"debug", &debug_fops},
2370 {"def_reserved_size", &dressz_fops},
2371 {"device_hdr", &devhdr_fops},
2372 {"devices", &dev_fops},
2373 {"device_strs", &devstrs_fops},
2374 {"version", &version_fops}
2375 };
2376
2377 static int
2378 sg_proc_init(void)
2379 {
2380 int k, mask;
2381 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2382 struct sg_proc_leaf * leaf;
2383
2384 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2385 if (!sg_proc_sgp)
2386 return 1;
2387 for (k = 0; k < num_leaves; ++k) {
2388 leaf = &sg_proc_leaf_arr[k];
2389 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2390 leaf->fops->owner = THIS_MODULE;
2391 leaf->fops->read = seq_read;
2392 leaf->fops->llseek = seq_lseek;
2393 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2394 }
2395 return 0;
2396 }
2397
2398 static void
2399 sg_proc_cleanup(void)
2400 {
2401 int k;
2402 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2403
2404 if (!sg_proc_sgp)
2405 return;
2406 for (k = 0; k < num_leaves; ++k)
2407 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2408 remove_proc_entry(sg_proc_sg_dirname, NULL);
2409 }
2410
2411
2412 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2413 {
2414 seq_printf(s, "%d\n", *((int *)s->private));
2415 return 0;
2416 }
2417
2418 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2419 {
2420 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2421 }
2422
2423 static ssize_t
2424 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2425 size_t count, loff_t *off)
2426 {
2427 int num;
2428 char buff[11];
2429
2430 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2431 return -EACCES;
2432 num = (count < 10) ? count : 10;
2433 if (copy_from_user(buff, buffer, num))
2434 return -EFAULT;
2435 buff[num] = '\0';
2436 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2437 return count;
2438 }
2439
2440 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2441 {
2442 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2443 }
2444
2445 static ssize_t
2446 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2447 size_t count, loff_t *off)
2448 {
2449 int num;
2450 unsigned long k = ULONG_MAX;
2451 char buff[11];
2452
2453 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2454 return -EACCES;
2455 num = (count < 10) ? count : 10;
2456 if (copy_from_user(buff, buffer, num))
2457 return -EFAULT;
2458 buff[num] = '\0';
2459 k = simple_strtoul(buff, NULL, 10);
2460 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2461 sg_big_buff = k;
2462 return count;
2463 }
2464 return -ERANGE;
2465 }
2466
2467 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2468 {
2469 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2470 sg_version_date);
2471 return 0;
2472 }
2473
2474 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2475 {
2476 return single_open(file, sg_proc_seq_show_version, NULL);
2477 }
2478
2479 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2480 {
2481 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2482 "online\n");
2483 return 0;
2484 }
2485
2486 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2487 {
2488 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2489 }
2490
2491 struct sg_proc_deviter {
2492 loff_t index;
2493 size_t max;
2494 };
2495
2496 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2497 {
2498 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2499
2500 s->private = it;
2501 if (! it)
2502 return NULL;
2503
2504 it->index = *pos;
2505 it->max = sg_last_dev();
2506 if (it->index >= it->max)
2507 return NULL;
2508 return it;
2509 }
2510
2511 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2512 {
2513 struct sg_proc_deviter * it = s->private;
2514
2515 *pos = ++it->index;
2516 return (it->index < it->max) ? it : NULL;
2517 }
2518
2519 static void dev_seq_stop(struct seq_file *s, void *v)
2520 {
2521 kfree(s->private);
2522 }
2523
2524 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2525 {
2526 return seq_open(file, &dev_seq_ops);
2527 }
2528
2529 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2530 {
2531 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2532 Sg_device *sdp;
2533 struct scsi_device *scsidp;
2534
2535 sdp = it ? sg_get_dev(it->index) : NULL;
2536 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2537 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2538 scsidp->host->host_no, scsidp->channel,
2539 scsidp->id, scsidp->lun, (int) scsidp->type,
2540 1,
2541 (int) scsidp->queue_depth,
2542 (int) scsidp->device_busy,
2543 (int) scsi_device_online(scsidp));
2544 else
2545 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2546 return 0;
2547 }
2548
2549 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2550 {
2551 return seq_open(file, &devstrs_seq_ops);
2552 }
2553
2554 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2555 {
2556 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2557 Sg_device *sdp;
2558 struct scsi_device *scsidp;
2559
2560 sdp = it ? sg_get_dev(it->index) : NULL;
2561 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2562 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2563 scsidp->vendor, scsidp->model, scsidp->rev);
2564 else
2565 seq_printf(s, "<no active device>\n");
2566 return 0;
2567 }
2568
2569 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2570 {
2571 int k, m, new_interface, blen, usg;
2572 Sg_request *srp;
2573 Sg_fd *fp;
2574 const sg_io_hdr_t *hp;
2575 const char * cp;
2576 unsigned int ms;
2577
2578 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2579 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2580 "(res)sgat=%d low_dma=%d\n", k + 1,
2581 jiffies_to_msecs(fp->timeout),
2582 fp->reserve.bufflen,
2583 (int) fp->reserve.k_use_sg,
2584 (int) fp->low_dma);
2585 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2586 (int) fp->cmd_q, (int) fp->force_packid,
2587 (int) fp->keep_orphan, (int) fp->closed);
2588 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2589 hp = &srp->header;
2590 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2591 if (srp->res_used) {
2592 if (new_interface &&
2593 (SG_FLAG_MMAP_IO & hp->flags))
2594 cp = " mmap>> ";
2595 else
2596 cp = " rb>> ";
2597 } else {
2598 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2599 cp = " dio>> ";
2600 else
2601 cp = " ";
2602 }
2603 seq_printf(s, cp);
2604 blen = srp->data.bufflen;
2605 usg = srp->data.k_use_sg;
2606 seq_printf(s, srp->done ?
2607 ((1 == srp->done) ? "rcv:" : "fin:")
2608 : "act:");
2609 seq_printf(s, " id=%d blen=%d",
2610 srp->header.pack_id, blen);
2611 if (srp->done)
2612 seq_printf(s, " dur=%d", hp->duration);
2613 else {
2614 ms = jiffies_to_msecs(jiffies);
2615 seq_printf(s, " t_o/elap=%d/%d",
2616 (new_interface ? hp->timeout :
2617 jiffies_to_msecs(fp->timeout)),
2618 (ms > hp->duration ? ms - hp->duration : 0));
2619 }
2620 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2621 (int) srp->data.cmd_opcode);
2622 }
2623 if (0 == m)
2624 seq_printf(s, " No requests active\n");
2625 }
2626 }
2627
2628 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2629 {
2630 return seq_open(file, &debug_seq_ops);
2631 }
2632
2633 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2634 {
2635 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2636 Sg_device *sdp;
2637
2638 if (it && (0 == it->index)) {
2639 seq_printf(s, "max_active_device=%d(origin 1)\n",
2640 (int)it->max);
2641 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2642 }
2643 sdp = it ? sg_get_dev(it->index) : NULL;
2644 if (sdp) {
2645 struct scsi_device *scsidp = sdp->device;
2646
2647 if (NULL == scsidp) {
2648 seq_printf(s, "device %d detached ??\n",
2649 (int)it->index);
2650 return 0;
2651 }
2652
2653 if (sg_get_nth_sfp(sdp, 0)) {
2654 seq_printf(s, " >>> device=%s ",
2655 sdp->disk->disk_name);
2656 if (sdp->detached)
2657 seq_printf(s, "detached pending close ");
2658 else
2659 seq_printf
2660 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2661 scsidp->host->host_no,
2662 scsidp->channel, scsidp->id,
2663 scsidp->lun,
2664 scsidp->host->hostt->emulated);
2665 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2666 sdp->sg_tablesize, sdp->exclude);
2667 }
2668 sg_proc_debug_helper(s, sdp);
2669 }
2670 return 0;
2671 }
2672
2673 #endif /* CONFIG_SCSI_PROC_FS */
2674
2675 module_init(init_sg);
2676 module_exit(exit_sg);
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