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scsi: autoconvert trivial BKL users to private mutex
[deliverable/linux.git] / drivers / scsi / sg.c
1 /*
2 * History:
3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
4 * to allow user process control of SCSI devices.
5 * Development Sponsored by Killy Corp. NY NY
6 *
7 * Original driver (sg.c):
8 * Copyright (C) 1992 Lawrence Foard
9 * Version 2 and 3 extensions to driver:
10 * Copyright (C) 1998 - 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/slab.h>
42 #include <linux/fcntl.h>
43 #include <linux/init.h>
44 #include <linux/poll.h>
45 #include <linux/moduleparam.h>
46 #include <linux/cdev.h>
47 #include <linux/idr.h>
48 #include <linux/seq_file.h>
49 #include <linux/blkdev.h>
50 #include <linux/delay.h>
51 #include <linux/blktrace_api.h>
52 #include <linux/mutex.h>
53
54 #include "scsi.h"
55 #include <scsi/scsi_dbg.h>
56 #include <scsi/scsi_host.h>
57 #include <scsi/scsi_driver.h>
58 #include <scsi/scsi_ioctl.h>
59 #include <scsi/sg.h>
60
61 #include "scsi_logging.h"
62
63 #ifdef CONFIG_SCSI_PROC_FS
64 #include <linux/proc_fs.h>
65 static char *sg_version_date = "20061027";
66
67 static int sg_proc_init(void);
68 static void sg_proc_cleanup(void);
69 #endif
70
71 #define SG_ALLOW_DIO_DEF 0
72
73 #define SG_MAX_DEVS 32768
74
75 /*
76 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
77 * Then when using 32 bit integers x * m may overflow during the calculation.
78 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
79 * calculates the same, but prevents the overflow when both m and d
80 * are "small" numbers (like HZ and USER_HZ).
81 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
82 * in 32 bits.
83 */
84 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
85
86 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
87
88 int sg_big_buff = SG_DEF_RESERVED_SIZE;
89 /* N.B. This variable is readable and writeable via
90 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
91 of this size (or less if there is not enough memory) will be reserved
92 for use by this file descriptor. [Deprecated usage: this variable is also
93 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
94 the kernel (i.e. it is not a module).] */
95 static int def_reserved_size = -1; /* picks up init parameter */
96 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
97
98 static int scatter_elem_sz = SG_SCATTER_SZ;
99 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
100
101 #define SG_SECTOR_SZ 512
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_MUTEX(sg_mutex);
107
108 static DEFINE_IDR(sg_index_idr);
109 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
110 file descriptor list for device */
111
112 static struct class_interface sg_interface = {
113 .add_dev = sg_add,
114 .remove_dev = sg_remove,
115 };
116
117 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
118 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
119 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
120 unsigned bufflen; /* Size of (aggregate) data buffer */
121 struct page **pages;
122 int page_order;
123 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
124 unsigned char cmd_opcode; /* first byte of command */
125 } Sg_scatter_hold;
126
127 struct sg_device; /* forward declarations */
128 struct sg_fd;
129
130 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
131 struct sg_request *nextrp; /* NULL -> tail request (slist) */
132 struct sg_fd *parentfp; /* NULL -> not in use */
133 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
134 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
135 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
136 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
137 char orphan; /* 1 -> drop on sight, 0 -> normal */
138 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
139 volatile char done; /* 0->before bh, 1->before read, 2->read */
140 struct request *rq;
141 struct bio *bio;
142 struct execute_work ew;
143 } Sg_request;
144
145 typedef struct sg_fd { /* holds the state of a file descriptor */
146 struct list_head sfd_siblings;
147 struct sg_device *parentdp; /* owning device */
148 wait_queue_head_t read_wait; /* queue read until command done */
149 rwlock_t rq_list_lock; /* protect access to list in req_arr */
150 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
151 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
152 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
153 unsigned save_scat_len; /* original length of trunc. scat. element */
154 Sg_request *headrp; /* head of request slist, NULL->empty */
155 struct fasync_struct *async_qp; /* used by asynchronous notification */
156 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
157 char low_dma; /* as in parent but possibly overridden to 1 */
158 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
159 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
160 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
161 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
162 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
163 char mmap_called; /* 0 -> mmap() never called on this fd */
164 struct kref f_ref;
165 struct execute_work ew;
166 } Sg_fd;
167
168 typedef struct sg_device { /* holds the state of each scsi generic device */
169 struct scsi_device *device;
170 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
171 int sg_tablesize; /* adapter's max scatter-gather table size */
172 u32 index; /* device index number */
173 struct list_head sfds;
174 volatile char detached; /* 0->attached, 1->detached pending removal */
175 volatile char exclude; /* opened for exclusive access */
176 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
177 struct gendisk *disk;
178 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
179 struct kref d_ref;
180 } Sg_device;
181
182 /* tasklet or soft irq callback */
183 static void sg_rq_end_io(struct request *rq, int uptodate);
184 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
185 static int sg_finish_rem_req(Sg_request * srp);
186 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
187 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
188 Sg_request * srp);
189 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
190 const char __user *buf, size_t count, int blocking,
191 int read_only, int sg_io_owned, Sg_request **o_srp);
192 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
193 unsigned char *cmnd, int timeout, int blocking);
194 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
195 static void sg_remove_scat(Sg_scatter_hold * schp);
196 static void sg_build_reserve(Sg_fd * sfp, int req_size);
197 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
198 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
199 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
200 static void sg_remove_sfp(struct kref *);
201 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
202 static Sg_request *sg_add_request(Sg_fd * sfp);
203 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
204 static int sg_res_in_use(Sg_fd * sfp);
205 static Sg_device *sg_get_dev(int dev);
206 static void sg_put_dev(Sg_device *sdp);
207
208 #define SZ_SG_HEADER sizeof(struct sg_header)
209 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
210 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
211 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
212
213 static int sg_allow_access(struct file *filp, unsigned char *cmd)
214 {
215 struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
216
217 if (sfp->parentdp->device->type == TYPE_SCANNER)
218 return 0;
219
220 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
221 }
222
223 static int
224 sg_open(struct inode *inode, struct file *filp)
225 {
226 int dev = iminor(inode);
227 int flags = filp->f_flags;
228 struct request_queue *q;
229 Sg_device *sdp;
230 Sg_fd *sfp;
231 int res;
232 int retval;
233
234 mutex_lock(&sg_mutex);
235 nonseekable_open(inode, filp);
236 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
237 sdp = sg_get_dev(dev);
238 if (IS_ERR(sdp)) {
239 retval = PTR_ERR(sdp);
240 sdp = NULL;
241 goto sg_put;
242 }
243
244 /* This driver's module count bumped by fops_get in <linux/fs.h> */
245 /* Prevent the device driver from vanishing while we sleep */
246 retval = scsi_device_get(sdp->device);
247 if (retval)
248 goto sg_put;
249
250 retval = scsi_autopm_get_device(sdp->device);
251 if (retval)
252 goto sdp_put;
253
254 if (!((flags & O_NONBLOCK) ||
255 scsi_block_when_processing_errors(sdp->device))) {
256 retval = -ENXIO;
257 /* we are in error recovery for this device */
258 goto error_out;
259 }
260
261 if (flags & O_EXCL) {
262 if (O_RDONLY == (flags & O_ACCMODE)) {
263 retval = -EPERM; /* Can't lock it with read only access */
264 goto error_out;
265 }
266 if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) {
267 retval = -EBUSY;
268 goto error_out;
269 }
270 res = 0;
271 __wait_event_interruptible(sdp->o_excl_wait,
272 ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
273 if (res) {
274 retval = res; /* -ERESTARTSYS because signal hit process */
275 goto error_out;
276 }
277 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
278 if (flags & O_NONBLOCK) {
279 retval = -EBUSY;
280 goto error_out;
281 }
282 res = 0;
283 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
284 res);
285 if (res) {
286 retval = res; /* -ERESTARTSYS because signal hit process */
287 goto error_out;
288 }
289 }
290 if (sdp->detached) {
291 retval = -ENODEV;
292 goto error_out;
293 }
294 if (list_empty(&sdp->sfds)) { /* no existing opens on this device */
295 sdp->sgdebug = 0;
296 q = sdp->device->request_queue;
297 sdp->sg_tablesize = queue_max_segments(q);
298 }
299 if ((sfp = sg_add_sfp(sdp, dev)))
300 filp->private_data = sfp;
301 else {
302 if (flags & O_EXCL) {
303 sdp->exclude = 0; /* undo if error */
304 wake_up_interruptible(&sdp->o_excl_wait);
305 }
306 retval = -ENOMEM;
307 goto error_out;
308 }
309 retval = 0;
310 error_out:
311 if (retval) {
312 scsi_autopm_put_device(sdp->device);
313 sdp_put:
314 scsi_device_put(sdp->device);
315 }
316 sg_put:
317 if (sdp)
318 sg_put_dev(sdp);
319 mutex_unlock(&sg_mutex);
320 return retval;
321 }
322
323 /* Following function was formerly called 'sg_close' */
324 static int
325 sg_release(struct inode *inode, struct file *filp)
326 {
327 Sg_device *sdp;
328 Sg_fd *sfp;
329
330 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
331 return -ENXIO;
332 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
333
334 sfp->closed = 1;
335
336 sdp->exclude = 0;
337 wake_up_interruptible(&sdp->o_excl_wait);
338
339 scsi_autopm_put_device(sdp->device);
340 kref_put(&sfp->f_ref, sg_remove_sfp);
341 return 0;
342 }
343
344 static ssize_t
345 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
346 {
347 Sg_device *sdp;
348 Sg_fd *sfp;
349 Sg_request *srp;
350 int req_pack_id = -1;
351 sg_io_hdr_t *hp;
352 struct sg_header *old_hdr = NULL;
353 int retval = 0;
354
355 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
356 return -ENXIO;
357 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
358 sdp->disk->disk_name, (int) count));
359
360 if (!access_ok(VERIFY_WRITE, buf, count))
361 return -EFAULT;
362 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
363 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
364 if (!old_hdr)
365 return -ENOMEM;
366 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
367 retval = -EFAULT;
368 goto free_old_hdr;
369 }
370 if (old_hdr->reply_len < 0) {
371 if (count >= SZ_SG_IO_HDR) {
372 sg_io_hdr_t *new_hdr;
373 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
374 if (!new_hdr) {
375 retval = -ENOMEM;
376 goto free_old_hdr;
377 }
378 retval =__copy_from_user
379 (new_hdr, buf, SZ_SG_IO_HDR);
380 req_pack_id = new_hdr->pack_id;
381 kfree(new_hdr);
382 if (retval) {
383 retval = -EFAULT;
384 goto free_old_hdr;
385 }
386 }
387 } else
388 req_pack_id = old_hdr->pack_id;
389 }
390 srp = sg_get_rq_mark(sfp, req_pack_id);
391 if (!srp) { /* now wait on packet to arrive */
392 if (sdp->detached) {
393 retval = -ENODEV;
394 goto free_old_hdr;
395 }
396 if (filp->f_flags & O_NONBLOCK) {
397 retval = -EAGAIN;
398 goto free_old_hdr;
399 }
400 while (1) {
401 retval = 0; /* following macro beats race condition */
402 __wait_event_interruptible(sfp->read_wait,
403 (sdp->detached ||
404 (srp = sg_get_rq_mark(sfp, req_pack_id))),
405 retval);
406 if (sdp->detached) {
407 retval = -ENODEV;
408 goto free_old_hdr;
409 }
410 if (0 == retval)
411 break;
412
413 /* -ERESTARTSYS as signal hit process */
414 goto free_old_hdr;
415 }
416 }
417 if (srp->header.interface_id != '\0') {
418 retval = sg_new_read(sfp, buf, count, srp);
419 goto free_old_hdr;
420 }
421
422 hp = &srp->header;
423 if (old_hdr == NULL) {
424 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
425 if (! old_hdr) {
426 retval = -ENOMEM;
427 goto free_old_hdr;
428 }
429 }
430 memset(old_hdr, 0, SZ_SG_HEADER);
431 old_hdr->reply_len = (int) hp->timeout;
432 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
433 old_hdr->pack_id = hp->pack_id;
434 old_hdr->twelve_byte =
435 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
436 old_hdr->target_status = hp->masked_status;
437 old_hdr->host_status = hp->host_status;
438 old_hdr->driver_status = hp->driver_status;
439 if ((CHECK_CONDITION & hp->masked_status) ||
440 (DRIVER_SENSE & hp->driver_status))
441 memcpy(old_hdr->sense_buffer, srp->sense_b,
442 sizeof (old_hdr->sense_buffer));
443 switch (hp->host_status) {
444 /* This setup of 'result' is for backward compatibility and is best
445 ignored by the user who should use target, host + driver status */
446 case DID_OK:
447 case DID_PASSTHROUGH:
448 case DID_SOFT_ERROR:
449 old_hdr->result = 0;
450 break;
451 case DID_NO_CONNECT:
452 case DID_BUS_BUSY:
453 case DID_TIME_OUT:
454 old_hdr->result = EBUSY;
455 break;
456 case DID_BAD_TARGET:
457 case DID_ABORT:
458 case DID_PARITY:
459 case DID_RESET:
460 case DID_BAD_INTR:
461 old_hdr->result = EIO;
462 break;
463 case DID_ERROR:
464 old_hdr->result = (srp->sense_b[0] == 0 &&
465 hp->masked_status == GOOD) ? 0 : EIO;
466 break;
467 default:
468 old_hdr->result = EIO;
469 break;
470 }
471
472 /* Now copy the result back to the user buffer. */
473 if (count >= SZ_SG_HEADER) {
474 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
475 retval = -EFAULT;
476 goto free_old_hdr;
477 }
478 buf += SZ_SG_HEADER;
479 if (count > old_hdr->reply_len)
480 count = old_hdr->reply_len;
481 if (count > SZ_SG_HEADER) {
482 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
483 retval = -EFAULT;
484 goto free_old_hdr;
485 }
486 }
487 } else
488 count = (old_hdr->result == 0) ? 0 : -EIO;
489 sg_finish_rem_req(srp);
490 retval = count;
491 free_old_hdr:
492 kfree(old_hdr);
493 return retval;
494 }
495
496 static ssize_t
497 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
498 {
499 sg_io_hdr_t *hp = &srp->header;
500 int err = 0;
501 int len;
502
503 if (count < SZ_SG_IO_HDR) {
504 err = -EINVAL;
505 goto err_out;
506 }
507 hp->sb_len_wr = 0;
508 if ((hp->mx_sb_len > 0) && hp->sbp) {
509 if ((CHECK_CONDITION & hp->masked_status) ||
510 (DRIVER_SENSE & hp->driver_status)) {
511 int sb_len = SCSI_SENSE_BUFFERSIZE;
512 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
513 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
514 len = (len > sb_len) ? sb_len : len;
515 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
516 err = -EFAULT;
517 goto err_out;
518 }
519 hp->sb_len_wr = len;
520 }
521 }
522 if (hp->masked_status || hp->host_status || hp->driver_status)
523 hp->info |= SG_INFO_CHECK;
524 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
525 err = -EFAULT;
526 goto err_out;
527 }
528 err_out:
529 err = 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,
565 blocking, 0, 0, NULL);
566 if (count < (SZ_SG_HEADER + 6))
567 return -EIO; /* The minimum scsi command length is 6 bytes. */
568
569 if (!(srp = sg_add_request(sfp))) {
570 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
571 return -EDOM;
572 }
573 buf += SZ_SG_HEADER;
574 __get_user(opcode, buf);
575 if (sfp->next_cmd_len > 0) {
576 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
577 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
578 sfp->next_cmd_len = 0;
579 sg_remove_request(sfp, srp);
580 return -EIO;
581 }
582 cmd_size = sfp->next_cmd_len;
583 sfp->next_cmd_len = 0; /* reset so only this write() effected */
584 } else {
585 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
586 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
587 cmd_size = 12;
588 }
589 SCSI_LOG_TIMEOUT(4, printk(
590 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
591 /* Determine buffer size. */
592 input_size = count - cmd_size;
593 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
594 mxsize -= SZ_SG_HEADER;
595 input_size -= SZ_SG_HEADER;
596 if (input_size < 0) {
597 sg_remove_request(sfp, srp);
598 return -EIO; /* User did not pass enough bytes for this command. */
599 }
600 hp = &srp->header;
601 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
602 hp->cmd_len = (unsigned char) cmd_size;
603 hp->iovec_count = 0;
604 hp->mx_sb_len = 0;
605 if (input_size > 0)
606 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
607 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
608 else
609 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
610 hp->dxfer_len = mxsize;
611 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
612 hp->dxferp = (char __user *)buf + cmd_size;
613 else
614 hp->dxferp = NULL;
615 hp->sbp = NULL;
616 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
617 hp->flags = input_size; /* structure abuse ... */
618 hp->pack_id = old_hdr.pack_id;
619 hp->usr_ptr = NULL;
620 if (__copy_from_user(cmnd, buf, cmd_size))
621 return -EFAULT;
622 /*
623 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
624 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
625 * is a non-zero input_size, so emit a warning.
626 */
627 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
628 static char cmd[TASK_COMM_LEN];
629 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
630 printk(KERN_WARNING
631 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
632 "guessing data in;\n "
633 "program %s not setting count and/or reply_len properly\n",
634 old_hdr.reply_len - (int)SZ_SG_HEADER,
635 input_size, (unsigned int) cmnd[0],
636 current->comm);
637 strcpy(cmd, current->comm);
638 }
639 }
640 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
641 return (k < 0) ? k : count;
642 }
643
644 static ssize_t
645 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
646 size_t count, int blocking, int read_only, int sg_io_owned,
647 Sg_request **o_srp)
648 {
649 int k;
650 Sg_request *srp;
651 sg_io_hdr_t *hp;
652 unsigned char cmnd[MAX_COMMAND_SIZE];
653 int timeout;
654 unsigned long ul_timeout;
655
656 if (count < SZ_SG_IO_HDR)
657 return -EINVAL;
658 if (!access_ok(VERIFY_READ, buf, count))
659 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
660
661 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
662 if (!(srp = sg_add_request(sfp))) {
663 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
664 return -EDOM;
665 }
666 srp->sg_io_owned = sg_io_owned;
667 hp = &srp->header;
668 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
669 sg_remove_request(sfp, srp);
670 return -EFAULT;
671 }
672 if (hp->interface_id != 'S') {
673 sg_remove_request(sfp, srp);
674 return -ENOSYS;
675 }
676 if (hp->flags & SG_FLAG_MMAP_IO) {
677 if (hp->dxfer_len > sfp->reserve.bufflen) {
678 sg_remove_request(sfp, srp);
679 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
680 }
681 if (hp->flags & SG_FLAG_DIRECT_IO) {
682 sg_remove_request(sfp, srp);
683 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
684 }
685 if (sg_res_in_use(sfp)) {
686 sg_remove_request(sfp, srp);
687 return -EBUSY; /* reserve buffer already being used */
688 }
689 }
690 ul_timeout = msecs_to_jiffies(srp->header.timeout);
691 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
692 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
693 sg_remove_request(sfp, srp);
694 return -EMSGSIZE;
695 }
696 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
697 sg_remove_request(sfp, srp);
698 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
699 }
700 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
701 sg_remove_request(sfp, srp);
702 return -EFAULT;
703 }
704 if (read_only && sg_allow_access(file, cmnd)) {
705 sg_remove_request(sfp, srp);
706 return -EPERM;
707 }
708 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
709 if (k < 0)
710 return k;
711 if (o_srp)
712 *o_srp = srp;
713 return count;
714 }
715
716 static int
717 sg_common_write(Sg_fd * sfp, Sg_request * srp,
718 unsigned char *cmnd, int timeout, int blocking)
719 {
720 int k, data_dir;
721 Sg_device *sdp = sfp->parentdp;
722 sg_io_hdr_t *hp = &srp->header;
723
724 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
725 hp->status = 0;
726 hp->masked_status = 0;
727 hp->msg_status = 0;
728 hp->info = 0;
729 hp->host_status = 0;
730 hp->driver_status = 0;
731 hp->resid = 0;
732 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
733 (int) cmnd[0], (int) hp->cmd_len));
734
735 k = sg_start_req(srp, cmnd);
736 if (k) {
737 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
738 sg_finish_rem_req(srp);
739 return k; /* probably out of space --> ENOMEM */
740 }
741 if (sdp->detached) {
742 if (srp->bio)
743 blk_end_request_all(srp->rq, -EIO);
744 sg_finish_rem_req(srp);
745 return -ENODEV;
746 }
747
748 switch (hp->dxfer_direction) {
749 case SG_DXFER_TO_FROM_DEV:
750 case SG_DXFER_FROM_DEV:
751 data_dir = DMA_FROM_DEVICE;
752 break;
753 case SG_DXFER_TO_DEV:
754 data_dir = DMA_TO_DEVICE;
755 break;
756 case SG_DXFER_UNKNOWN:
757 data_dir = DMA_BIDIRECTIONAL;
758 break;
759 default:
760 data_dir = DMA_NONE;
761 break;
762 }
763 hp->duration = jiffies_to_msecs(jiffies);
764
765 srp->rq->timeout = timeout;
766 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
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_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
774 {
775 void __user *p = (void __user *)arg;
776 int __user *ip = p;
777 int result, val, read_only;
778 Sg_device *sdp;
779 Sg_fd *sfp;
780 Sg_request *srp;
781 unsigned long iflags;
782
783 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
784 return -ENXIO;
785
786 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
787 sdp->disk->disk_name, (int) cmd_in));
788 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
789
790 switch (cmd_in) {
791 case SG_IO:
792 {
793 int blocking = 1; /* ignore O_NONBLOCK flag */
794
795 if (sdp->detached)
796 return -ENODEV;
797 if (!scsi_block_when_processing_errors(sdp->device))
798 return -ENXIO;
799 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
800 return -EFAULT;
801 result =
802 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
803 blocking, read_only, 1, &srp);
804 if (result < 0)
805 return result;
806 while (1) {
807 result = 0; /* following macro to beat race condition */
808 __wait_event_interruptible(sfp->read_wait,
809 (srp->done || sdp->detached),
810 result);
811 if (sdp->detached)
812 return -ENODEV;
813 write_lock_irq(&sfp->rq_list_lock);
814 if (srp->done) {
815 srp->done = 2;
816 write_unlock_irq(&sfp->rq_list_lock);
817 break;
818 }
819 srp->orphan = 1;
820 write_unlock_irq(&sfp->rq_list_lock);
821 return result; /* -ERESTARTSYS because signal hit process */
822 }
823 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
824 return (result < 0) ? result : 0;
825 }
826 case SG_SET_TIMEOUT:
827 result = get_user(val, ip);
828 if (result)
829 return result;
830 if (val < 0)
831 return -EIO;
832 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
833 val = MULDIV (INT_MAX, USER_HZ, HZ);
834 sfp->timeout_user = val;
835 sfp->timeout = MULDIV (val, HZ, USER_HZ);
836
837 return 0;
838 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
839 /* strange ..., for backward compatibility */
840 return sfp->timeout_user;
841 case SG_SET_FORCE_LOW_DMA:
842 result = get_user(val, ip);
843 if (result)
844 return result;
845 if (val) {
846 sfp->low_dma = 1;
847 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
848 val = (int) sfp->reserve.bufflen;
849 sg_remove_scat(&sfp->reserve);
850 sg_build_reserve(sfp, val);
851 }
852 } else {
853 if (sdp->detached)
854 return -ENODEV;
855 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
856 }
857 return 0;
858 case SG_GET_LOW_DMA:
859 return put_user((int) sfp->low_dma, ip);
860 case SG_GET_SCSI_ID:
861 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
862 return -EFAULT;
863 else {
864 sg_scsi_id_t __user *sg_idp = p;
865
866 if (sdp->detached)
867 return -ENODEV;
868 __put_user((int) sdp->device->host->host_no,
869 &sg_idp->host_no);
870 __put_user((int) sdp->device->channel,
871 &sg_idp->channel);
872 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
873 __put_user((int) sdp->device->lun, &sg_idp->lun);
874 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
875 __put_user((short) sdp->device->host->cmd_per_lun,
876 &sg_idp->h_cmd_per_lun);
877 __put_user((short) sdp->device->queue_depth,
878 &sg_idp->d_queue_depth);
879 __put_user(0, &sg_idp->unused[0]);
880 __put_user(0, &sg_idp->unused[1]);
881 return 0;
882 }
883 case SG_SET_FORCE_PACK_ID:
884 result = get_user(val, ip);
885 if (result)
886 return result;
887 sfp->force_packid = val ? 1 : 0;
888 return 0;
889 case SG_GET_PACK_ID:
890 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
891 return -EFAULT;
892 read_lock_irqsave(&sfp->rq_list_lock, iflags);
893 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
894 if ((1 == srp->done) && (!srp->sg_io_owned)) {
895 read_unlock_irqrestore(&sfp->rq_list_lock,
896 iflags);
897 __put_user(srp->header.pack_id, ip);
898 return 0;
899 }
900 }
901 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
902 __put_user(-1, ip);
903 return 0;
904 case SG_GET_NUM_WAITING:
905 read_lock_irqsave(&sfp->rq_list_lock, iflags);
906 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
907 if ((1 == srp->done) && (!srp->sg_io_owned))
908 ++val;
909 }
910 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
911 return put_user(val, ip);
912 case SG_GET_SG_TABLESIZE:
913 return put_user(sdp->sg_tablesize, ip);
914 case SG_SET_RESERVED_SIZE:
915 result = get_user(val, ip);
916 if (result)
917 return result;
918 if (val < 0)
919 return -EINVAL;
920 val = min_t(int, val,
921 queue_max_sectors(sdp->device->request_queue) * 512);
922 if (val != sfp->reserve.bufflen) {
923 if (sg_res_in_use(sfp) || sfp->mmap_called)
924 return -EBUSY;
925 sg_remove_scat(&sfp->reserve);
926 sg_build_reserve(sfp, val);
927 }
928 return 0;
929 case SG_GET_RESERVED_SIZE:
930 val = min_t(int, sfp->reserve.bufflen,
931 queue_max_sectors(sdp->device->request_queue) * 512);
932 return put_user(val, ip);
933 case SG_SET_COMMAND_Q:
934 result = get_user(val, ip);
935 if (result)
936 return result;
937 sfp->cmd_q = val ? 1 : 0;
938 return 0;
939 case SG_GET_COMMAND_Q:
940 return put_user((int) sfp->cmd_q, ip);
941 case SG_SET_KEEP_ORPHAN:
942 result = get_user(val, ip);
943 if (result)
944 return result;
945 sfp->keep_orphan = val;
946 return 0;
947 case SG_GET_KEEP_ORPHAN:
948 return put_user((int) sfp->keep_orphan, ip);
949 case SG_NEXT_CMD_LEN:
950 result = get_user(val, ip);
951 if (result)
952 return result;
953 sfp->next_cmd_len = (val > 0) ? val : 0;
954 return 0;
955 case SG_GET_VERSION_NUM:
956 return put_user(sg_version_num, ip);
957 case SG_GET_ACCESS_COUNT:
958 /* faked - we don't have a real access count anymore */
959 val = (sdp->device ? 1 : 0);
960 return put_user(val, ip);
961 case SG_GET_REQUEST_TABLE:
962 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
963 return -EFAULT;
964 else {
965 sg_req_info_t *rinfo;
966 unsigned int ms;
967
968 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
969 GFP_KERNEL);
970 if (!rinfo)
971 return -ENOMEM;
972 read_lock_irqsave(&sfp->rq_list_lock, iflags);
973 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
974 ++val, srp = srp ? srp->nextrp : srp) {
975 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
976 if (srp) {
977 rinfo[val].req_state = srp->done + 1;
978 rinfo[val].problem =
979 srp->header.masked_status &
980 srp->header.host_status &
981 srp->header.driver_status;
982 if (srp->done)
983 rinfo[val].duration =
984 srp->header.duration;
985 else {
986 ms = jiffies_to_msecs(jiffies);
987 rinfo[val].duration =
988 (ms > srp->header.duration) ?
989 (ms - srp->header.duration) : 0;
990 }
991 rinfo[val].orphan = srp->orphan;
992 rinfo[val].sg_io_owned =
993 srp->sg_io_owned;
994 rinfo[val].pack_id =
995 srp->header.pack_id;
996 rinfo[val].usr_ptr =
997 srp->header.usr_ptr;
998 }
999 }
1000 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1001 result = __copy_to_user(p, rinfo,
1002 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1003 result = result ? -EFAULT : 0;
1004 kfree(rinfo);
1005 return result;
1006 }
1007 case SG_EMULATED_HOST:
1008 if (sdp->detached)
1009 return -ENODEV;
1010 return put_user(sdp->device->host->hostt->emulated, ip);
1011 case SG_SCSI_RESET:
1012 if (sdp->detached)
1013 return -ENODEV;
1014 if (filp->f_flags & O_NONBLOCK) {
1015 if (scsi_host_in_recovery(sdp->device->host))
1016 return -EBUSY;
1017 } else if (!scsi_block_when_processing_errors(sdp->device))
1018 return -EBUSY;
1019 result = get_user(val, ip);
1020 if (result)
1021 return result;
1022 if (SG_SCSI_RESET_NOTHING == val)
1023 return 0;
1024 switch (val) {
1025 case SG_SCSI_RESET_DEVICE:
1026 val = SCSI_TRY_RESET_DEVICE;
1027 break;
1028 case SG_SCSI_RESET_TARGET:
1029 val = SCSI_TRY_RESET_TARGET;
1030 break;
1031 case SG_SCSI_RESET_BUS:
1032 val = SCSI_TRY_RESET_BUS;
1033 break;
1034 case SG_SCSI_RESET_HOST:
1035 val = SCSI_TRY_RESET_HOST;
1036 break;
1037 default:
1038 return -EINVAL;
1039 }
1040 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1041 return -EACCES;
1042 return (scsi_reset_provider(sdp->device, val) ==
1043 SUCCESS) ? 0 : -EIO;
1044 case SCSI_IOCTL_SEND_COMMAND:
1045 if (sdp->detached)
1046 return -ENODEV;
1047 if (read_only) {
1048 unsigned char opcode = WRITE_6;
1049 Scsi_Ioctl_Command __user *siocp = p;
1050
1051 if (copy_from_user(&opcode, siocp->data, 1))
1052 return -EFAULT;
1053 if (sg_allow_access(filp, &opcode))
1054 return -EPERM;
1055 }
1056 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1057 case SG_SET_DEBUG:
1058 result = get_user(val, ip);
1059 if (result)
1060 return result;
1061 sdp->sgdebug = (char) val;
1062 return 0;
1063 case SCSI_IOCTL_GET_IDLUN:
1064 case SCSI_IOCTL_GET_BUS_NUMBER:
1065 case SCSI_IOCTL_PROBE_HOST:
1066 case SG_GET_TRANSFORM:
1067 if (sdp->detached)
1068 return -ENODEV;
1069 return scsi_ioctl(sdp->device, cmd_in, p);
1070 case BLKSECTGET:
1071 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
1072 ip);
1073 case BLKTRACESETUP:
1074 return blk_trace_setup(sdp->device->request_queue,
1075 sdp->disk->disk_name,
1076 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1077 NULL,
1078 (char *)arg);
1079 case BLKTRACESTART:
1080 return blk_trace_startstop(sdp->device->request_queue, 1);
1081 case BLKTRACESTOP:
1082 return blk_trace_startstop(sdp->device->request_queue, 0);
1083 case BLKTRACETEARDOWN:
1084 return blk_trace_remove(sdp->device->request_queue);
1085 default:
1086 if (read_only)
1087 return -EPERM; /* don't know so take safe approach */
1088 return scsi_ioctl(sdp->device, cmd_in, p);
1089 }
1090 }
1091
1092 static long
1093 sg_unlocked_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1094 {
1095 int ret;
1096
1097 mutex_lock(&sg_mutex);
1098 ret = sg_ioctl(filp, cmd_in, arg);
1099 mutex_unlock(&sg_mutex);
1100
1101 return ret;
1102 }
1103
1104 #ifdef CONFIG_COMPAT
1105 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1106 {
1107 Sg_device *sdp;
1108 Sg_fd *sfp;
1109 struct scsi_device *sdev;
1110
1111 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1112 return -ENXIO;
1113
1114 sdev = sdp->device;
1115 if (sdev->host->hostt->compat_ioctl) {
1116 int ret;
1117
1118 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1119
1120 return ret;
1121 }
1122
1123 return -ENOIOCTLCMD;
1124 }
1125 #endif
1126
1127 static unsigned int
1128 sg_poll(struct file *filp, poll_table * wait)
1129 {
1130 unsigned int res = 0;
1131 Sg_device *sdp;
1132 Sg_fd *sfp;
1133 Sg_request *srp;
1134 int count = 0;
1135 unsigned long iflags;
1136
1137 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1138 || sfp->closed)
1139 return POLLERR;
1140 poll_wait(filp, &sfp->read_wait, wait);
1141 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1142 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1143 /* if any read waiting, flag it */
1144 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1145 res = POLLIN | POLLRDNORM;
1146 ++count;
1147 }
1148 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1149
1150 if (sdp->detached)
1151 res |= POLLHUP;
1152 else if (!sfp->cmd_q) {
1153 if (0 == count)
1154 res |= POLLOUT | POLLWRNORM;
1155 } else if (count < SG_MAX_QUEUE)
1156 res |= POLLOUT | POLLWRNORM;
1157 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1158 sdp->disk->disk_name, (int) res));
1159 return res;
1160 }
1161
1162 static int
1163 sg_fasync(int fd, struct file *filp, int mode)
1164 {
1165 Sg_device *sdp;
1166 Sg_fd *sfp;
1167
1168 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1169 return -ENXIO;
1170 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1171 sdp->disk->disk_name, mode));
1172
1173 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1174 }
1175
1176 static int
1177 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1178 {
1179 Sg_fd *sfp;
1180 unsigned long offset, len, sa;
1181 Sg_scatter_hold *rsv_schp;
1182 int k, length;
1183
1184 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1185 return VM_FAULT_SIGBUS;
1186 rsv_schp = &sfp->reserve;
1187 offset = vmf->pgoff << PAGE_SHIFT;
1188 if (offset >= rsv_schp->bufflen)
1189 return VM_FAULT_SIGBUS;
1190 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1191 offset, rsv_schp->k_use_sg));
1192 sa = vma->vm_start;
1193 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1194 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1195 len = vma->vm_end - sa;
1196 len = (len < length) ? len : length;
1197 if (offset < len) {
1198 struct page *page = nth_page(rsv_schp->pages[k],
1199 offset >> PAGE_SHIFT);
1200 get_page(page); /* increment page count */
1201 vmf->page = page;
1202 return 0; /* success */
1203 }
1204 sa += len;
1205 offset -= len;
1206 }
1207
1208 return VM_FAULT_SIGBUS;
1209 }
1210
1211 static const struct vm_operations_struct sg_mmap_vm_ops = {
1212 .fault = sg_vma_fault,
1213 };
1214
1215 static int
1216 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1217 {
1218 Sg_fd *sfp;
1219 unsigned long req_sz, len, sa;
1220 Sg_scatter_hold *rsv_schp;
1221 int k, length;
1222
1223 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1224 return -ENXIO;
1225 req_sz = vma->vm_end - vma->vm_start;
1226 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1227 (void *) vma->vm_start, (int) req_sz));
1228 if (vma->vm_pgoff)
1229 return -EINVAL; /* want no offset */
1230 rsv_schp = &sfp->reserve;
1231 if (req_sz > rsv_schp->bufflen)
1232 return -ENOMEM; /* cannot map more than reserved buffer */
1233
1234 sa = vma->vm_start;
1235 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1236 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1237 len = vma->vm_end - sa;
1238 len = (len < length) ? len : length;
1239 sa += len;
1240 }
1241
1242 sfp->mmap_called = 1;
1243 vma->vm_flags |= VM_RESERVED;
1244 vma->vm_private_data = sfp;
1245 vma->vm_ops = &sg_mmap_vm_ops;
1246 return 0;
1247 }
1248
1249 static void sg_rq_end_io_usercontext(struct work_struct *work)
1250 {
1251 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1252 struct sg_fd *sfp = srp->parentfp;
1253
1254 sg_finish_rem_req(srp);
1255 kref_put(&sfp->f_ref, sg_remove_sfp);
1256 }
1257
1258 /*
1259 * This function is a "bottom half" handler that is called by the mid
1260 * level when a command is completed (or has failed).
1261 */
1262 static void sg_rq_end_io(struct request *rq, int uptodate)
1263 {
1264 struct sg_request *srp = rq->end_io_data;
1265 Sg_device *sdp;
1266 Sg_fd *sfp;
1267 unsigned long iflags;
1268 unsigned int ms;
1269 char *sense;
1270 int result, resid, done = 1;
1271
1272 if (WARN_ON(srp->done != 0))
1273 return;
1274
1275 sfp = srp->parentfp;
1276 if (WARN_ON(sfp == NULL))
1277 return;
1278
1279 sdp = sfp->parentdp;
1280 if (unlikely(sdp->detached))
1281 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1282
1283 sense = rq->sense;
1284 result = rq->errors;
1285 resid = rq->resid_len;
1286
1287 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1288 sdp->disk->disk_name, srp->header.pack_id, result));
1289 srp->header.resid = resid;
1290 ms = jiffies_to_msecs(jiffies);
1291 srp->header.duration = (ms > srp->header.duration) ?
1292 (ms - srp->header.duration) : 0;
1293 if (0 != result) {
1294 struct scsi_sense_hdr sshdr;
1295
1296 srp->header.status = 0xff & result;
1297 srp->header.masked_status = status_byte(result);
1298 srp->header.msg_status = msg_byte(result);
1299 srp->header.host_status = host_byte(result);
1300 srp->header.driver_status = driver_byte(result);
1301 if ((sdp->sgdebug > 0) &&
1302 ((CHECK_CONDITION == srp->header.masked_status) ||
1303 (COMMAND_TERMINATED == srp->header.masked_status)))
1304 __scsi_print_sense("sg_cmd_done", sense,
1305 SCSI_SENSE_BUFFERSIZE);
1306
1307 /* Following if statement is a patch supplied by Eric Youngdale */
1308 if (driver_byte(result) != 0
1309 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1310 && !scsi_sense_is_deferred(&sshdr)
1311 && sshdr.sense_key == UNIT_ATTENTION
1312 && sdp->device->removable) {
1313 /* Detected possible disc change. Set the bit - this */
1314 /* may be used if there are filesystems using this device */
1315 sdp->device->changed = 1;
1316 }
1317 }
1318 /* Rely on write phase to clean out srp status values, so no "else" */
1319
1320 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1321 if (unlikely(srp->orphan)) {
1322 if (sfp->keep_orphan)
1323 srp->sg_io_owned = 0;
1324 else
1325 done = 0;
1326 }
1327 srp->done = done;
1328 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1329
1330 if (likely(done)) {
1331 /* Now wake up any sg_read() that is waiting for this
1332 * packet.
1333 */
1334 wake_up_interruptible(&sfp->read_wait);
1335 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1336 kref_put(&sfp->f_ref, sg_remove_sfp);
1337 } else {
1338 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1339 schedule_work(&srp->ew.work);
1340 }
1341 }
1342
1343 static const struct file_operations sg_fops = {
1344 .owner = THIS_MODULE,
1345 .read = sg_read,
1346 .write = sg_write,
1347 .poll = sg_poll,
1348 .unlocked_ioctl = sg_unlocked_ioctl,
1349 #ifdef CONFIG_COMPAT
1350 .compat_ioctl = sg_compat_ioctl,
1351 #endif
1352 .open = sg_open,
1353 .mmap = sg_mmap,
1354 .release = sg_release,
1355 .fasync = sg_fasync,
1356 };
1357
1358 static struct class *sg_sysfs_class;
1359
1360 static int sg_sysfs_valid = 0;
1361
1362 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1363 {
1364 struct request_queue *q = scsidp->request_queue;
1365 Sg_device *sdp;
1366 unsigned long iflags;
1367 int error;
1368 u32 k;
1369
1370 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1371 if (!sdp) {
1372 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1373 return ERR_PTR(-ENOMEM);
1374 }
1375
1376 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1377 printk(KERN_WARNING "idr expansion Sg_device failure\n");
1378 error = -ENOMEM;
1379 goto out;
1380 }
1381
1382 write_lock_irqsave(&sg_index_lock, iflags);
1383
1384 error = idr_get_new(&sg_index_idr, sdp, &k);
1385 if (error) {
1386 write_unlock_irqrestore(&sg_index_lock, iflags);
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_LIST_HEAD(&sdp->sfds);
1401 init_waitqueue_head(&sdp->o_excl_wait);
1402 sdp->sg_tablesize = queue_max_segments(q);
1403 sdp->index = k;
1404 kref_init(&sdp->d_ref);
1405
1406 write_unlock_irqrestore(&sg_index_lock, iflags);
1407
1408 error = 0;
1409 out:
1410 if (error) {
1411 kfree(sdp);
1412 return ERR_PTR(error);
1413 }
1414 return sdp;
1415
1416 overflow:
1417 idr_remove(&sg_index_idr, k);
1418 write_unlock_irqrestore(&sg_index_lock, iflags);
1419 sdev_printk(KERN_WARNING, scsidp,
1420 "Unable to attach sg device type=%d, minor "
1421 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1422 error = -ENODEV;
1423 goto out;
1424 }
1425
1426 static int
1427 sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1428 {
1429 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1430 struct gendisk *disk;
1431 Sg_device *sdp = NULL;
1432 struct cdev * cdev = NULL;
1433 int error;
1434 unsigned long iflags;
1435
1436 disk = alloc_disk(1);
1437 if (!disk) {
1438 printk(KERN_WARNING "alloc_disk failed\n");
1439 return -ENOMEM;
1440 }
1441 disk->major = SCSI_GENERIC_MAJOR;
1442
1443 error = -ENOMEM;
1444 cdev = cdev_alloc();
1445 if (!cdev) {
1446 printk(KERN_WARNING "cdev_alloc failed\n");
1447 goto out;
1448 }
1449 cdev->owner = THIS_MODULE;
1450 cdev->ops = &sg_fops;
1451
1452 sdp = sg_alloc(disk, scsidp);
1453 if (IS_ERR(sdp)) {
1454 printk(KERN_WARNING "sg_alloc failed\n");
1455 error = PTR_ERR(sdp);
1456 goto out;
1457 }
1458
1459 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1460 if (error)
1461 goto cdev_add_err;
1462
1463 sdp->cdev = cdev;
1464 if (sg_sysfs_valid) {
1465 struct device *sg_class_member;
1466
1467 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1468 MKDEV(SCSI_GENERIC_MAJOR,
1469 sdp->index),
1470 sdp, "%s", disk->disk_name);
1471 if (IS_ERR(sg_class_member)) {
1472 printk(KERN_ERR "sg_add: "
1473 "device_create failed\n");
1474 error = PTR_ERR(sg_class_member);
1475 goto cdev_add_err;
1476 }
1477 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1478 &sg_class_member->kobj, "generic");
1479 if (error)
1480 printk(KERN_ERR "sg_add: unable to make symlink "
1481 "'generic' back to sg%d\n", sdp->index);
1482 } else
1483 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1484
1485 sdev_printk(KERN_NOTICE, scsidp,
1486 "Attached scsi generic sg%d type %d\n", sdp->index,
1487 scsidp->type);
1488
1489 dev_set_drvdata(cl_dev, sdp);
1490
1491 return 0;
1492
1493 cdev_add_err:
1494 write_lock_irqsave(&sg_index_lock, iflags);
1495 idr_remove(&sg_index_idr, sdp->index);
1496 write_unlock_irqrestore(&sg_index_lock, iflags);
1497 kfree(sdp);
1498
1499 out:
1500 put_disk(disk);
1501 if (cdev)
1502 cdev_del(cdev);
1503 return error;
1504 }
1505
1506 static void sg_device_destroy(struct kref *kref)
1507 {
1508 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1509 unsigned long flags;
1510
1511 /* CAUTION! Note that the device can still be found via idr_find()
1512 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1513 * any other cleanup.
1514 */
1515
1516 write_lock_irqsave(&sg_index_lock, flags);
1517 idr_remove(&sg_index_idr, sdp->index);
1518 write_unlock_irqrestore(&sg_index_lock, flags);
1519
1520 SCSI_LOG_TIMEOUT(3,
1521 printk("sg_device_destroy: %s\n",
1522 sdp->disk->disk_name));
1523
1524 put_disk(sdp->disk);
1525 kfree(sdp);
1526 }
1527
1528 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1529 {
1530 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1531 Sg_device *sdp = dev_get_drvdata(cl_dev);
1532 unsigned long iflags;
1533 Sg_fd *sfp;
1534
1535 if (!sdp || sdp->detached)
1536 return;
1537
1538 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1539
1540 /* Need a write lock to set sdp->detached. */
1541 write_lock_irqsave(&sg_index_lock, iflags);
1542 sdp->detached = 1;
1543 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1544 wake_up_interruptible(&sfp->read_wait);
1545 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1546 }
1547 write_unlock_irqrestore(&sg_index_lock, iflags);
1548
1549 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1550 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1551 cdev_del(sdp->cdev);
1552 sdp->cdev = NULL;
1553
1554 sg_put_dev(sdp);
1555 }
1556
1557 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1558 module_param_named(def_reserved_size, def_reserved_size, int,
1559 S_IRUGO | S_IWUSR);
1560 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1561
1562 MODULE_AUTHOR("Douglas Gilbert");
1563 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1564 MODULE_LICENSE("GPL");
1565 MODULE_VERSION(SG_VERSION_STR);
1566 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1567
1568 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1569 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1570 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1571 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1572
1573 static int __init
1574 init_sg(void)
1575 {
1576 int rc;
1577
1578 if (scatter_elem_sz < PAGE_SIZE) {
1579 scatter_elem_sz = PAGE_SIZE;
1580 scatter_elem_sz_prev = scatter_elem_sz;
1581 }
1582 if (def_reserved_size >= 0)
1583 sg_big_buff = def_reserved_size;
1584 else
1585 def_reserved_size = sg_big_buff;
1586
1587 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1588 SG_MAX_DEVS, "sg");
1589 if (rc)
1590 return rc;
1591 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1592 if ( IS_ERR(sg_sysfs_class) ) {
1593 rc = PTR_ERR(sg_sysfs_class);
1594 goto err_out;
1595 }
1596 sg_sysfs_valid = 1;
1597 rc = scsi_register_interface(&sg_interface);
1598 if (0 == rc) {
1599 #ifdef CONFIG_SCSI_PROC_FS
1600 sg_proc_init();
1601 #endif /* CONFIG_SCSI_PROC_FS */
1602 return 0;
1603 }
1604 class_destroy(sg_sysfs_class);
1605 err_out:
1606 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1607 return rc;
1608 }
1609
1610 static void __exit
1611 exit_sg(void)
1612 {
1613 #ifdef CONFIG_SCSI_PROC_FS
1614 sg_proc_cleanup();
1615 #endif /* CONFIG_SCSI_PROC_FS */
1616 scsi_unregister_interface(&sg_interface);
1617 class_destroy(sg_sysfs_class);
1618 sg_sysfs_valid = 0;
1619 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1620 SG_MAX_DEVS);
1621 idr_destroy(&sg_index_idr);
1622 }
1623
1624 static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1625 {
1626 int res;
1627 struct request *rq;
1628 Sg_fd *sfp = srp->parentfp;
1629 sg_io_hdr_t *hp = &srp->header;
1630 int dxfer_len = (int) hp->dxfer_len;
1631 int dxfer_dir = hp->dxfer_direction;
1632 unsigned int iov_count = hp->iovec_count;
1633 Sg_scatter_hold *req_schp = &srp->data;
1634 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1635 struct request_queue *q = sfp->parentdp->device->request_queue;
1636 struct rq_map_data *md, map_data;
1637 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1638
1639 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1640 dxfer_len));
1641
1642 rq = blk_get_request(q, rw, GFP_ATOMIC);
1643 if (!rq)
1644 return -ENOMEM;
1645
1646 memcpy(rq->cmd, cmd, hp->cmd_len);
1647
1648 rq->cmd_len = hp->cmd_len;
1649 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1650
1651 srp->rq = rq;
1652 rq->end_io_data = srp;
1653 rq->sense = srp->sense_b;
1654 rq->retries = SG_DEFAULT_RETRIES;
1655
1656 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1657 return 0;
1658
1659 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1660 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1661 !sfp->parentdp->device->host->unchecked_isa_dma &&
1662 blk_rq_aligned(q, hp->dxferp, dxfer_len))
1663 md = NULL;
1664 else
1665 md = &map_data;
1666
1667 if (md) {
1668 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1669 sg_link_reserve(sfp, srp, dxfer_len);
1670 else {
1671 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1672 if (res)
1673 return res;
1674 }
1675
1676 md->pages = req_schp->pages;
1677 md->page_order = req_schp->page_order;
1678 md->nr_entries = req_schp->k_use_sg;
1679 md->offset = 0;
1680 md->null_mapped = hp->dxferp ? 0 : 1;
1681 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1682 md->from_user = 1;
1683 else
1684 md->from_user = 0;
1685 }
1686
1687 if (iov_count) {
1688 int len, size = sizeof(struct sg_iovec) * iov_count;
1689 struct iovec *iov;
1690
1691 iov = memdup_user(hp->dxferp, size);
1692 if (IS_ERR(iov))
1693 return PTR_ERR(iov);
1694
1695 len = iov_length(iov, iov_count);
1696 if (hp->dxfer_len < len) {
1697 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1698 len = hp->dxfer_len;
1699 }
1700
1701 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1702 iov_count,
1703 len, GFP_ATOMIC);
1704 kfree(iov);
1705 } else
1706 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1707 hp->dxfer_len, GFP_ATOMIC);
1708
1709 if (!res) {
1710 srp->bio = rq->bio;
1711
1712 if (!md) {
1713 req_schp->dio_in_use = 1;
1714 hp->info |= SG_INFO_DIRECT_IO;
1715 }
1716 }
1717 return res;
1718 }
1719
1720 static int sg_finish_rem_req(Sg_request * srp)
1721 {
1722 int ret = 0;
1723
1724 Sg_fd *sfp = srp->parentfp;
1725 Sg_scatter_hold *req_schp = &srp->data;
1726
1727 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1728 if (srp->rq) {
1729 if (srp->bio)
1730 ret = blk_rq_unmap_user(srp->bio);
1731
1732 blk_put_request(srp->rq);
1733 }
1734
1735 if (srp->res_used)
1736 sg_unlink_reserve(sfp, srp);
1737 else
1738 sg_remove_scat(req_schp);
1739
1740 sg_remove_request(sfp, srp);
1741
1742 return ret;
1743 }
1744
1745 static int
1746 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1747 {
1748 int sg_bufflen = tablesize * sizeof(struct page *);
1749 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1750
1751 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1752 if (!schp->pages)
1753 return -ENOMEM;
1754 schp->sglist_len = sg_bufflen;
1755 return tablesize; /* number of scat_gath elements allocated */
1756 }
1757
1758 static int
1759 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1760 {
1761 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1762 int sg_tablesize = sfp->parentdp->sg_tablesize;
1763 int blk_size = buff_size, order;
1764 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1765
1766 if (blk_size < 0)
1767 return -EFAULT;
1768 if (0 == blk_size)
1769 ++blk_size; /* don't know why */
1770 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1771 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1772 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1773 buff_size, blk_size));
1774
1775 /* N.B. ret_sz carried into this block ... */
1776 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1777 if (mx_sc_elems < 0)
1778 return mx_sc_elems; /* most likely -ENOMEM */
1779
1780 num = scatter_elem_sz;
1781 if (unlikely(num != scatter_elem_sz_prev)) {
1782 if (num < PAGE_SIZE) {
1783 scatter_elem_sz = PAGE_SIZE;
1784 scatter_elem_sz_prev = PAGE_SIZE;
1785 } else
1786 scatter_elem_sz_prev = num;
1787 }
1788
1789 if (sfp->low_dma)
1790 gfp_mask |= GFP_DMA;
1791
1792 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1793 gfp_mask |= __GFP_ZERO;
1794
1795 order = get_order(num);
1796 retry:
1797 ret_sz = 1 << (PAGE_SHIFT + order);
1798
1799 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1800 k++, rem_sz -= ret_sz) {
1801
1802 num = (rem_sz > scatter_elem_sz_prev) ?
1803 scatter_elem_sz_prev : rem_sz;
1804
1805 schp->pages[k] = alloc_pages(gfp_mask, order);
1806 if (!schp->pages[k])
1807 goto out;
1808
1809 if (num == scatter_elem_sz_prev) {
1810 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1811 scatter_elem_sz = ret_sz;
1812 scatter_elem_sz_prev = ret_sz;
1813 }
1814 }
1815
1816 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1817 "ret_sz=%d\n", k, num, ret_sz));
1818 } /* end of for loop */
1819
1820 schp->page_order = order;
1821 schp->k_use_sg = k;
1822 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1823 "rem_sz=%d\n", k, rem_sz));
1824
1825 schp->bufflen = blk_size;
1826 if (rem_sz > 0) /* must have failed */
1827 return -ENOMEM;
1828 return 0;
1829 out:
1830 for (i = 0; i < k; i++)
1831 __free_pages(schp->pages[i], order);
1832
1833 if (--order >= 0)
1834 goto retry;
1835
1836 return -ENOMEM;
1837 }
1838
1839 static void
1840 sg_remove_scat(Sg_scatter_hold * schp)
1841 {
1842 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1843 if (schp->pages && schp->sglist_len > 0) {
1844 if (!schp->dio_in_use) {
1845 int k;
1846
1847 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1848 SCSI_LOG_TIMEOUT(5, printk(
1849 "sg_remove_scat: k=%d, pg=0x%p\n",
1850 k, schp->pages[k]));
1851 __free_pages(schp->pages[k], schp->page_order);
1852 }
1853
1854 kfree(schp->pages);
1855 }
1856 }
1857 memset(schp, 0, sizeof (*schp));
1858 }
1859
1860 static int
1861 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1862 {
1863 Sg_scatter_hold *schp = &srp->data;
1864 int k, num;
1865
1866 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1867 num_read_xfer));
1868 if ((!outp) || (num_read_xfer <= 0))
1869 return 0;
1870
1871 num = 1 << (PAGE_SHIFT + schp->page_order);
1872 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1873 if (num > num_read_xfer) {
1874 if (__copy_to_user(outp, page_address(schp->pages[k]),
1875 num_read_xfer))
1876 return -EFAULT;
1877 break;
1878 } else {
1879 if (__copy_to_user(outp, page_address(schp->pages[k]),
1880 num))
1881 return -EFAULT;
1882 num_read_xfer -= num;
1883 if (num_read_xfer <= 0)
1884 break;
1885 outp += num;
1886 }
1887 }
1888
1889 return 0;
1890 }
1891
1892 static void
1893 sg_build_reserve(Sg_fd * sfp, int req_size)
1894 {
1895 Sg_scatter_hold *schp = &sfp->reserve;
1896
1897 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1898 do {
1899 if (req_size < PAGE_SIZE)
1900 req_size = PAGE_SIZE;
1901 if (0 == sg_build_indirect(schp, sfp, req_size))
1902 return;
1903 else
1904 sg_remove_scat(schp);
1905 req_size >>= 1; /* divide by 2 */
1906 } while (req_size > (PAGE_SIZE / 2));
1907 }
1908
1909 static void
1910 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1911 {
1912 Sg_scatter_hold *req_schp = &srp->data;
1913 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1914 int k, num, rem;
1915
1916 srp->res_used = 1;
1917 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1918 rem = size;
1919
1920 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1921 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1922 if (rem <= num) {
1923 req_schp->k_use_sg = k + 1;
1924 req_schp->sglist_len = rsv_schp->sglist_len;
1925 req_schp->pages = rsv_schp->pages;
1926
1927 req_schp->bufflen = size;
1928 req_schp->page_order = rsv_schp->page_order;
1929 break;
1930 } else
1931 rem -= num;
1932 }
1933
1934 if (k >= rsv_schp->k_use_sg)
1935 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1936 }
1937
1938 static void
1939 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1940 {
1941 Sg_scatter_hold *req_schp = &srp->data;
1942
1943 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1944 (int) req_schp->k_use_sg));
1945 req_schp->k_use_sg = 0;
1946 req_schp->bufflen = 0;
1947 req_schp->pages = NULL;
1948 req_schp->page_order = 0;
1949 req_schp->sglist_len = 0;
1950 sfp->save_scat_len = 0;
1951 srp->res_used = 0;
1952 }
1953
1954 static Sg_request *
1955 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1956 {
1957 Sg_request *resp;
1958 unsigned long iflags;
1959
1960 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1961 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1962 /* look for requests that are ready + not SG_IO owned */
1963 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1964 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1965 resp->done = 2; /* guard against other readers */
1966 break;
1967 }
1968 }
1969 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1970 return resp;
1971 }
1972
1973 /* always adds to end of list */
1974 static Sg_request *
1975 sg_add_request(Sg_fd * sfp)
1976 {
1977 int k;
1978 unsigned long iflags;
1979 Sg_request *resp;
1980 Sg_request *rp = sfp->req_arr;
1981
1982 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1983 resp = sfp->headrp;
1984 if (!resp) {
1985 memset(rp, 0, sizeof (Sg_request));
1986 rp->parentfp = sfp;
1987 resp = rp;
1988 sfp->headrp = resp;
1989 } else {
1990 if (0 == sfp->cmd_q)
1991 resp = NULL; /* command queuing disallowed */
1992 else {
1993 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
1994 if (!rp->parentfp)
1995 break;
1996 }
1997 if (k < SG_MAX_QUEUE) {
1998 memset(rp, 0, sizeof (Sg_request));
1999 rp->parentfp = sfp;
2000 while (resp->nextrp)
2001 resp = resp->nextrp;
2002 resp->nextrp = rp;
2003 resp = rp;
2004 } else
2005 resp = NULL;
2006 }
2007 }
2008 if (resp) {
2009 resp->nextrp = NULL;
2010 resp->header.duration = jiffies_to_msecs(jiffies);
2011 }
2012 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2013 return resp;
2014 }
2015
2016 /* Return of 1 for found; 0 for not found */
2017 static int
2018 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2019 {
2020 Sg_request *prev_rp;
2021 Sg_request *rp;
2022 unsigned long iflags;
2023 int res = 0;
2024
2025 if ((!sfp) || (!srp) || (!sfp->headrp))
2026 return res;
2027 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2028 prev_rp = sfp->headrp;
2029 if (srp == prev_rp) {
2030 sfp->headrp = prev_rp->nextrp;
2031 prev_rp->parentfp = NULL;
2032 res = 1;
2033 } else {
2034 while ((rp = prev_rp->nextrp)) {
2035 if (srp == rp) {
2036 prev_rp->nextrp = rp->nextrp;
2037 rp->parentfp = NULL;
2038 res = 1;
2039 break;
2040 }
2041 prev_rp = rp;
2042 }
2043 }
2044 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2045 return res;
2046 }
2047
2048 static Sg_fd *
2049 sg_add_sfp(Sg_device * sdp, int dev)
2050 {
2051 Sg_fd *sfp;
2052 unsigned long iflags;
2053 int bufflen;
2054
2055 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2056 if (!sfp)
2057 return NULL;
2058
2059 init_waitqueue_head(&sfp->read_wait);
2060 rwlock_init(&sfp->rq_list_lock);
2061
2062 kref_init(&sfp->f_ref);
2063 sfp->timeout = SG_DEFAULT_TIMEOUT;
2064 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2065 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2066 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2067 sdp->device->host->unchecked_isa_dma : 1;
2068 sfp->cmd_q = SG_DEF_COMMAND_Q;
2069 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2070 sfp->parentdp = sdp;
2071 write_lock_irqsave(&sg_index_lock, iflags);
2072 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2073 write_unlock_irqrestore(&sg_index_lock, iflags);
2074 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2075 if (unlikely(sg_big_buff != def_reserved_size))
2076 sg_big_buff = def_reserved_size;
2077
2078 bufflen = min_t(int, sg_big_buff,
2079 queue_max_sectors(sdp->device->request_queue) * 512);
2080 sg_build_reserve(sfp, bufflen);
2081 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2082 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2083
2084 kref_get(&sdp->d_ref);
2085 __module_get(THIS_MODULE);
2086 return sfp;
2087 }
2088
2089 static void sg_remove_sfp_usercontext(struct work_struct *work)
2090 {
2091 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2092 struct sg_device *sdp = sfp->parentdp;
2093
2094 /* Cleanup any responses which were never read(). */
2095 while (sfp->headrp)
2096 sg_finish_rem_req(sfp->headrp);
2097
2098 if (sfp->reserve.bufflen > 0) {
2099 SCSI_LOG_TIMEOUT(6,
2100 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2101 (int) sfp->reserve.bufflen,
2102 (int) sfp->reserve.k_use_sg));
2103 sg_remove_scat(&sfp->reserve);
2104 }
2105
2106 SCSI_LOG_TIMEOUT(6,
2107 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2108 sdp->disk->disk_name,
2109 sfp));
2110 kfree(sfp);
2111
2112 scsi_device_put(sdp->device);
2113 sg_put_dev(sdp);
2114 module_put(THIS_MODULE);
2115 }
2116
2117 static void sg_remove_sfp(struct kref *kref)
2118 {
2119 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2120 struct sg_device *sdp = sfp->parentdp;
2121 unsigned long iflags;
2122
2123 write_lock_irqsave(&sg_index_lock, iflags);
2124 list_del(&sfp->sfd_siblings);
2125 write_unlock_irqrestore(&sg_index_lock, iflags);
2126 wake_up_interruptible(&sdp->o_excl_wait);
2127
2128 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2129 schedule_work(&sfp->ew.work);
2130 }
2131
2132 static int
2133 sg_res_in_use(Sg_fd * sfp)
2134 {
2135 const Sg_request *srp;
2136 unsigned long iflags;
2137
2138 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2139 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2140 if (srp->res_used)
2141 break;
2142 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2143 return srp ? 1 : 0;
2144 }
2145
2146 #ifdef CONFIG_SCSI_PROC_FS
2147 static int
2148 sg_idr_max_id(int id, void *p, void *data)
2149 {
2150 int *k = data;
2151
2152 if (*k < id)
2153 *k = id;
2154
2155 return 0;
2156 }
2157
2158 static int
2159 sg_last_dev(void)
2160 {
2161 int k = -1;
2162 unsigned long iflags;
2163
2164 read_lock_irqsave(&sg_index_lock, iflags);
2165 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2166 read_unlock_irqrestore(&sg_index_lock, iflags);
2167 return k + 1; /* origin 1 */
2168 }
2169 #endif
2170
2171 /* must be called with sg_index_lock held */
2172 static Sg_device *sg_lookup_dev(int dev)
2173 {
2174 return idr_find(&sg_index_idr, dev);
2175 }
2176
2177 static Sg_device *sg_get_dev(int dev)
2178 {
2179 struct sg_device *sdp;
2180 unsigned long flags;
2181
2182 read_lock_irqsave(&sg_index_lock, flags);
2183 sdp = sg_lookup_dev(dev);
2184 if (!sdp)
2185 sdp = ERR_PTR(-ENXIO);
2186 else if (sdp->detached) {
2187 /* If sdp->detached, then the refcount may already be 0, in
2188 * which case it would be a bug to do kref_get().
2189 */
2190 sdp = ERR_PTR(-ENODEV);
2191 } else
2192 kref_get(&sdp->d_ref);
2193 read_unlock_irqrestore(&sg_index_lock, flags);
2194
2195 return sdp;
2196 }
2197
2198 static void sg_put_dev(struct sg_device *sdp)
2199 {
2200 kref_put(&sdp->d_ref, sg_device_destroy);
2201 }
2202
2203 #ifdef CONFIG_SCSI_PROC_FS
2204
2205 static struct proc_dir_entry *sg_proc_sgp = NULL;
2206
2207 static char sg_proc_sg_dirname[] = "scsi/sg";
2208
2209 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2210
2211 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2212 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2213 size_t count, loff_t *off);
2214 static const struct file_operations adio_fops = {
2215 .owner = THIS_MODULE,
2216 .open = sg_proc_single_open_adio,
2217 .read = seq_read,
2218 .llseek = seq_lseek,
2219 .write = sg_proc_write_adio,
2220 .release = single_release,
2221 };
2222
2223 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2224 static ssize_t sg_proc_write_dressz(struct file *filp,
2225 const char __user *buffer, size_t count, loff_t *off);
2226 static const struct file_operations dressz_fops = {
2227 .owner = THIS_MODULE,
2228 .open = sg_proc_single_open_dressz,
2229 .read = seq_read,
2230 .llseek = seq_lseek,
2231 .write = sg_proc_write_dressz,
2232 .release = single_release,
2233 };
2234
2235 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2236 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2237 static const struct file_operations version_fops = {
2238 .owner = THIS_MODULE,
2239 .open = sg_proc_single_open_version,
2240 .read = seq_read,
2241 .llseek = seq_lseek,
2242 .release = single_release,
2243 };
2244
2245 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2246 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2247 static const struct file_operations devhdr_fops = {
2248 .owner = THIS_MODULE,
2249 .open = sg_proc_single_open_devhdr,
2250 .read = seq_read,
2251 .llseek = seq_lseek,
2252 .release = single_release,
2253 };
2254
2255 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2256 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2257 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2258 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2259 static void dev_seq_stop(struct seq_file *s, void *v);
2260 static const struct file_operations dev_fops = {
2261 .owner = THIS_MODULE,
2262 .open = sg_proc_open_dev,
2263 .read = seq_read,
2264 .llseek = seq_lseek,
2265 .release = seq_release,
2266 };
2267 static const struct seq_operations dev_seq_ops = {
2268 .start = dev_seq_start,
2269 .next = dev_seq_next,
2270 .stop = dev_seq_stop,
2271 .show = sg_proc_seq_show_dev,
2272 };
2273
2274 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2275 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2276 static const struct file_operations devstrs_fops = {
2277 .owner = THIS_MODULE,
2278 .open = sg_proc_open_devstrs,
2279 .read = seq_read,
2280 .llseek = seq_lseek,
2281 .release = seq_release,
2282 };
2283 static const struct seq_operations devstrs_seq_ops = {
2284 .start = dev_seq_start,
2285 .next = dev_seq_next,
2286 .stop = dev_seq_stop,
2287 .show = sg_proc_seq_show_devstrs,
2288 };
2289
2290 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2291 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2292 static const struct file_operations debug_fops = {
2293 .owner = THIS_MODULE,
2294 .open = sg_proc_open_debug,
2295 .read = seq_read,
2296 .llseek = seq_lseek,
2297 .release = seq_release,
2298 };
2299 static const struct seq_operations debug_seq_ops = {
2300 .start = dev_seq_start,
2301 .next = dev_seq_next,
2302 .stop = dev_seq_stop,
2303 .show = sg_proc_seq_show_debug,
2304 };
2305
2306
2307 struct sg_proc_leaf {
2308 const char * name;
2309 const struct file_operations * fops;
2310 };
2311
2312 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2313 {"allow_dio", &adio_fops},
2314 {"debug", &debug_fops},
2315 {"def_reserved_size", &dressz_fops},
2316 {"device_hdr", &devhdr_fops},
2317 {"devices", &dev_fops},
2318 {"device_strs", &devstrs_fops},
2319 {"version", &version_fops}
2320 };
2321
2322 static int
2323 sg_proc_init(void)
2324 {
2325 int k, mask;
2326 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2327 struct sg_proc_leaf * leaf;
2328
2329 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2330 if (!sg_proc_sgp)
2331 return 1;
2332 for (k = 0; k < num_leaves; ++k) {
2333 leaf = &sg_proc_leaf_arr[k];
2334 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2335 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2336 }
2337 return 0;
2338 }
2339
2340 static void
2341 sg_proc_cleanup(void)
2342 {
2343 int k;
2344 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2345
2346 if (!sg_proc_sgp)
2347 return;
2348 for (k = 0; k < num_leaves; ++k)
2349 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2350 remove_proc_entry(sg_proc_sg_dirname, NULL);
2351 }
2352
2353
2354 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2355 {
2356 seq_printf(s, "%d\n", *((int *)s->private));
2357 return 0;
2358 }
2359
2360 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2361 {
2362 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2363 }
2364
2365 static ssize_t
2366 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2367 size_t count, loff_t *off)
2368 {
2369 int num;
2370 char buff[11];
2371
2372 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2373 return -EACCES;
2374 num = (count < 10) ? count : 10;
2375 if (copy_from_user(buff, buffer, num))
2376 return -EFAULT;
2377 buff[num] = '\0';
2378 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2379 return count;
2380 }
2381
2382 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2383 {
2384 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2385 }
2386
2387 static ssize_t
2388 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2389 size_t count, loff_t *off)
2390 {
2391 int num;
2392 unsigned long k = ULONG_MAX;
2393 char buff[11];
2394
2395 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2396 return -EACCES;
2397 num = (count < 10) ? count : 10;
2398 if (copy_from_user(buff, buffer, num))
2399 return -EFAULT;
2400 buff[num] = '\0';
2401 k = simple_strtoul(buff, NULL, 10);
2402 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2403 sg_big_buff = k;
2404 return count;
2405 }
2406 return -ERANGE;
2407 }
2408
2409 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2410 {
2411 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2412 sg_version_date);
2413 return 0;
2414 }
2415
2416 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2417 {
2418 return single_open(file, sg_proc_seq_show_version, NULL);
2419 }
2420
2421 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2422 {
2423 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2424 "online\n");
2425 return 0;
2426 }
2427
2428 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2429 {
2430 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2431 }
2432
2433 struct sg_proc_deviter {
2434 loff_t index;
2435 size_t max;
2436 };
2437
2438 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2439 {
2440 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2441
2442 s->private = it;
2443 if (! it)
2444 return NULL;
2445
2446 it->index = *pos;
2447 it->max = sg_last_dev();
2448 if (it->index >= it->max)
2449 return NULL;
2450 return it;
2451 }
2452
2453 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2454 {
2455 struct sg_proc_deviter * it = s->private;
2456
2457 *pos = ++it->index;
2458 return (it->index < it->max) ? it : NULL;
2459 }
2460
2461 static void dev_seq_stop(struct seq_file *s, void *v)
2462 {
2463 kfree(s->private);
2464 }
2465
2466 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2467 {
2468 return seq_open(file, &dev_seq_ops);
2469 }
2470
2471 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2472 {
2473 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2474 Sg_device *sdp;
2475 struct scsi_device *scsidp;
2476 unsigned long iflags;
2477
2478 read_lock_irqsave(&sg_index_lock, iflags);
2479 sdp = it ? sg_lookup_dev(it->index) : NULL;
2480 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2481 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2482 scsidp->host->host_no, scsidp->channel,
2483 scsidp->id, scsidp->lun, (int) scsidp->type,
2484 1,
2485 (int) scsidp->queue_depth,
2486 (int) scsidp->device_busy,
2487 (int) scsi_device_online(scsidp));
2488 else
2489 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2490 read_unlock_irqrestore(&sg_index_lock, iflags);
2491 return 0;
2492 }
2493
2494 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2495 {
2496 return seq_open(file, &devstrs_seq_ops);
2497 }
2498
2499 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2500 {
2501 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2502 Sg_device *sdp;
2503 struct scsi_device *scsidp;
2504 unsigned long iflags;
2505
2506 read_lock_irqsave(&sg_index_lock, iflags);
2507 sdp = it ? sg_lookup_dev(it->index) : NULL;
2508 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2509 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2510 scsidp->vendor, scsidp->model, scsidp->rev);
2511 else
2512 seq_printf(s, "<no active device>\n");
2513 read_unlock_irqrestore(&sg_index_lock, iflags);
2514 return 0;
2515 }
2516
2517 /* must be called while holding sg_index_lock */
2518 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2519 {
2520 int k, m, new_interface, blen, usg;
2521 Sg_request *srp;
2522 Sg_fd *fp;
2523 const sg_io_hdr_t *hp;
2524 const char * cp;
2525 unsigned int ms;
2526
2527 k = 0;
2528 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2529 k++;
2530 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2531 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2532 "(res)sgat=%d low_dma=%d\n", k,
2533 jiffies_to_msecs(fp->timeout),
2534 fp->reserve.bufflen,
2535 (int) fp->reserve.k_use_sg,
2536 (int) fp->low_dma);
2537 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2538 (int) fp->cmd_q, (int) fp->force_packid,
2539 (int) fp->keep_orphan, (int) fp->closed);
2540 for (m = 0, srp = fp->headrp;
2541 srp != NULL;
2542 ++m, srp = srp->nextrp) {
2543 hp = &srp->header;
2544 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2545 if (srp->res_used) {
2546 if (new_interface &&
2547 (SG_FLAG_MMAP_IO & hp->flags))
2548 cp = " mmap>> ";
2549 else
2550 cp = " rb>> ";
2551 } else {
2552 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2553 cp = " dio>> ";
2554 else
2555 cp = " ";
2556 }
2557 seq_printf(s, cp);
2558 blen = srp->data.bufflen;
2559 usg = srp->data.k_use_sg;
2560 seq_printf(s, srp->done ?
2561 ((1 == srp->done) ? "rcv:" : "fin:")
2562 : "act:");
2563 seq_printf(s, " id=%d blen=%d",
2564 srp->header.pack_id, blen);
2565 if (srp->done)
2566 seq_printf(s, " dur=%d", hp->duration);
2567 else {
2568 ms = jiffies_to_msecs(jiffies);
2569 seq_printf(s, " t_o/elap=%d/%d",
2570 (new_interface ? hp->timeout :
2571 jiffies_to_msecs(fp->timeout)),
2572 (ms > hp->duration ? ms - hp->duration : 0));
2573 }
2574 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2575 (int) srp->data.cmd_opcode);
2576 }
2577 if (0 == m)
2578 seq_printf(s, " No requests active\n");
2579 read_unlock(&fp->rq_list_lock);
2580 }
2581 }
2582
2583 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2584 {
2585 return seq_open(file, &debug_seq_ops);
2586 }
2587
2588 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2589 {
2590 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2591 Sg_device *sdp;
2592 unsigned long iflags;
2593
2594 if (it && (0 == it->index)) {
2595 seq_printf(s, "max_active_device=%d(origin 1)\n",
2596 (int)it->max);
2597 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2598 }
2599
2600 read_lock_irqsave(&sg_index_lock, iflags);
2601 sdp = it ? sg_lookup_dev(it->index) : NULL;
2602 if (sdp && !list_empty(&sdp->sfds)) {
2603 struct scsi_device *scsidp = sdp->device;
2604
2605 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2606 if (sdp->detached)
2607 seq_printf(s, "detached pending close ");
2608 else
2609 seq_printf
2610 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2611 scsidp->host->host_no,
2612 scsidp->channel, scsidp->id,
2613 scsidp->lun,
2614 scsidp->host->hostt->emulated);
2615 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2616 sdp->sg_tablesize, sdp->exclude);
2617 sg_proc_debug_helper(s, sdp);
2618 }
2619 read_unlock_irqrestore(&sg_index_lock, iflags);
2620 return 0;
2621 }
2622
2623 #endif /* CONFIG_SCSI_PROC_FS */
2624
2625 module_init(init_sg);
2626 module_exit(exit_sg);
Linux kernel - Deliverables
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