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ext4: Fix discard of inode prealloc space with delayed allocation.
[linux-2.6/mini2440.git] / drivers / scsi / sg.c
blob5e390d2df2df67d6512f19f1c065350627f2135c
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_device_destroy(struct kref *kref);
105 static void sg_remove(struct device *, struct class_interface *);
106
107 static DEFINE_IDR(sg_index_idr);
108 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
109 file descriptor list for device */
110
111 static struct class_interface sg_interface = {
112 .add_dev = sg_add,
113 .remove_dev = sg_remove,
114 };
115
116 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
117 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
118 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
119 unsigned bufflen; /* Size of (aggregate) data buffer */
120 struct page **pages;
121 int page_order;
122 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
123 unsigned char cmd_opcode; /* first byte of command */
124 } Sg_scatter_hold;
125
126 struct sg_device; /* forward declarations */
127 struct sg_fd;
128
129 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
130 struct sg_request *nextrp; /* NULL -> tail request (slist) */
131 struct sg_fd *parentfp; /* NULL -> not in use */
132 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
133 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
134 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
135 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
136 char orphan; /* 1 -> drop on sight, 0 -> normal */
137 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
138 volatile char done; /* 0->before bh, 1->before read, 2->read */
139 struct request *rq;
140 struct bio *bio;
141 struct execute_work ew;
142 } Sg_request;
143
144 typedef struct sg_fd { /* holds the state of a file descriptor */
145 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
146 struct sg_device *parentdp; /* owning device */
147 wait_queue_head_t read_wait; /* queue read until command done */
148 rwlock_t rq_list_lock; /* protect access to list in req_arr */
149 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
150 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
151 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
152 unsigned save_scat_len; /* original length of trunc. scat. element */
153 Sg_request *headrp; /* head of request slist, NULL->empty */
154 struct fasync_struct *async_qp; /* used by asynchronous notification */
155 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
156 char low_dma; /* as in parent but possibly overridden to 1 */
157 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
158 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
159 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
160 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
161 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
162 char mmap_called; /* 0 -> mmap() never called on this fd */
163 struct kref f_ref;
164 struct execute_work ew;
165 } Sg_fd;
166
167 typedef struct sg_device { /* holds the state of each scsi generic device */
168 struct scsi_device *device;
169 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
170 int sg_tablesize; /* adapter's max scatter-gather table size */
171 u32 index; /* device index number */
172 Sg_fd *headfp; /* first open fd belonging to this device */
173 volatile char detached; /* 0->attached, 1->detached pending removal */
174 volatile char exclude; /* opened for exclusive access */
175 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
176 struct gendisk *disk;
177 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
178 struct kref d_ref;
179 } Sg_device;
180
181 static int sg_fasync(int fd, struct file *filp, int mode);
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 void 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 int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
188 int tablesize);
189 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
190 Sg_request * srp);
191 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
192 const char __user *buf, size_t count, int blocking,
193 int read_only, int sg_io_owned, Sg_request **o_srp);
194 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
195 unsigned char *cmnd, int timeout, int blocking);
196 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
197 static void sg_remove_scat(Sg_scatter_hold * schp);
198 static void sg_build_reserve(Sg_fd * sfp, int req_size);
199 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
200 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
201 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
202 static void sg_remove_sfp(struct kref *);
203 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
204 static Sg_request *sg_add_request(Sg_fd * sfp);
205 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
206 static int sg_res_in_use(Sg_fd * sfp);
207 static Sg_device *sg_lookup_dev(int dev);
208 static Sg_device *sg_get_dev(int dev);
209 static void sg_put_dev(Sg_device *sdp);
210 #ifdef CONFIG_SCSI_PROC_FS
211 static int sg_last_dev(void);
212 #endif
213
214 #define SZ_SG_HEADER sizeof(struct sg_header)
215 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
216 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
217 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
218
219 static int sg_allow_access(struct file *filp, unsigned char *cmd)
220 {
221 struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
222 struct request_queue *q = sfp->parentdp->device->request_queue;
223
224 if (sfp->parentdp->device->type == TYPE_SCANNER)
225 return 0;
226
227 return blk_verify_command(&q->cmd_filter,
228 cmd, filp->f_mode & FMODE_WRITE);
229 }
230
231 static int
232 sg_open(struct inode *inode, struct file *filp)
233 {
234 int dev = iminor(inode);
235 int flags = filp->f_flags;
236 struct request_queue *q;
237 Sg_device *sdp;
238 Sg_fd *sfp;
239 int res;
240 int retval;
241
242 lock_kernel();
243 nonseekable_open(inode, filp);
244 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
245 sdp = sg_get_dev(dev);
246 if (IS_ERR(sdp)) {
247 retval = PTR_ERR(sdp);
248 sdp = NULL;
249 goto sg_put;
250 }
251
252 /* This driver's module count bumped by fops_get in <linux/fs.h> */
253 /* Prevent the device driver from vanishing while we sleep */
254 retval = scsi_device_get(sdp->device);
255 if (retval)
256 goto sg_put;
257
258 if (!((flags & O_NONBLOCK) ||
259 scsi_block_when_processing_errors(sdp->device))) {
260 retval = -ENXIO;
261 /* we are in error recovery for this device */
262 goto error_out;
263 }
264
265 if (flags & O_EXCL) {
266 if (O_RDONLY == (flags & O_ACCMODE)) {
267 retval = -EPERM; /* Can't lock it with read only access */
268 goto error_out;
269 }
270 if (sdp->headfp && (flags & O_NONBLOCK)) {
271 retval = -EBUSY;
272 goto error_out;
273 }
274 res = 0;
275 __wait_event_interruptible(sdp->o_excl_wait,
276 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
277 if (res) {
278 retval = res; /* -ERESTARTSYS because signal hit process */
279 goto error_out;
280 }
281 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
282 if (flags & O_NONBLOCK) {
283 retval = -EBUSY;
284 goto error_out;
285 }
286 res = 0;
287 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
288 res);
289 if (res) {
290 retval = res; /* -ERESTARTSYS because signal hit process */
291 goto error_out;
292 }
293 }
294 if (sdp->detached) {
295 retval = -ENODEV;
296 goto error_out;
297 }
298 if (!sdp->headfp) { /* no existing opens on this device */
299 sdp->sgdebug = 0;
300 q = sdp->device->request_queue;
301 sdp->sg_tablesize = min(q->max_hw_segments,
302 q->max_phys_segments);
303 }
304 if ((sfp = sg_add_sfp(sdp, dev)))
305 filp->private_data = sfp;
306 else {
307 if (flags & O_EXCL) {
308 sdp->exclude = 0; /* undo if error */
309 wake_up_interruptible(&sdp->o_excl_wait);
310 }
311 retval = -ENOMEM;
312 goto error_out;
313 }
314 retval = 0;
315 error_out:
316 if (retval)
317 scsi_device_put(sdp->device);
318 sg_put:
319 if (sdp)
320 sg_put_dev(sdp);
321 unlock_kernel();
322 return retval;
323 }
324
325 /* Following function was formerly called 'sg_close' */
326 static int
327 sg_release(struct inode *inode, struct file *filp)
328 {
329 Sg_device *sdp;
330 Sg_fd *sfp;
331
332 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
333 return -ENXIO;
334 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
335
336 sfp->closed = 1;
337
338 sdp->exclude = 0;
339 wake_up_interruptible(&sdp->o_excl_wait);
340
341 kref_put(&sfp->f_ref, sg_remove_sfp);
342 return 0;
343 }
344
345 static ssize_t
346 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
347 {
348 Sg_device *sdp;
349 Sg_fd *sfp;
350 Sg_request *srp;
351 int req_pack_id = -1;
352 sg_io_hdr_t *hp;
353 struct sg_header *old_hdr = NULL;
354 int retval = 0;
355
356 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
357 return -ENXIO;
358 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
359 sdp->disk->disk_name, (int) count));
360
361 if (!access_ok(VERIFY_WRITE, buf, count))
362 return -EFAULT;
363 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
364 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
365 if (!old_hdr)
366 return -ENOMEM;
367 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
368 retval = -EFAULT;
369 goto free_old_hdr;
370 }
371 if (old_hdr->reply_len < 0) {
372 if (count >= SZ_SG_IO_HDR) {
373 sg_io_hdr_t *new_hdr;
374 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
375 if (!new_hdr) {
376 retval = -ENOMEM;
377 goto free_old_hdr;
378 }
379 retval =__copy_from_user
380 (new_hdr, buf, SZ_SG_IO_HDR);
381 req_pack_id = new_hdr->pack_id;
382 kfree(new_hdr);
383 if (retval) {
384 retval = -EFAULT;
385 goto free_old_hdr;
386 }
387 }
388 } else
389 req_pack_id = old_hdr->pack_id;
390 }
391 srp = sg_get_rq_mark(sfp, req_pack_id);
392 if (!srp) { /* now wait on packet to arrive */
393 if (sdp->detached) {
394 retval = -ENODEV;
395 goto free_old_hdr;
396 }
397 if (filp->f_flags & O_NONBLOCK) {
398 retval = -EAGAIN;
399 goto free_old_hdr;
400 }
401 while (1) {
402 retval = 0; /* following macro beats race condition */
403 __wait_event_interruptible(sfp->read_wait,
404 (sdp->detached ||
405 (srp = sg_get_rq_mark(sfp, req_pack_id))),
406 retval);
407 if (sdp->detached) {
408 retval = -ENODEV;
409 goto free_old_hdr;
410 }
411 if (0 == retval)
412 break;
413
414 /* -ERESTARTSYS as signal hit process */
415 goto free_old_hdr;
416 }
417 }
418 if (srp->header.interface_id != '\0') {
419 retval = sg_new_read(sfp, buf, count, srp);
420 goto free_old_hdr;
421 }
422
423 hp = &srp->header;
424 if (old_hdr == NULL) {
425 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
426 if (! old_hdr) {
427 retval = -ENOMEM;
428 goto free_old_hdr;
429 }
430 }
431 memset(old_hdr, 0, SZ_SG_HEADER);
432 old_hdr->reply_len = (int) hp->timeout;
433 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
434 old_hdr->pack_id = hp->pack_id;
435 old_hdr->twelve_byte =
436 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
437 old_hdr->target_status = hp->masked_status;
438 old_hdr->host_status = hp->host_status;
439 old_hdr->driver_status = hp->driver_status;
440 if ((CHECK_CONDITION & hp->masked_status) ||
441 (DRIVER_SENSE & hp->driver_status))
442 memcpy(old_hdr->sense_buffer, srp->sense_b,
443 sizeof (old_hdr->sense_buffer));
444 switch (hp->host_status) {
445 /* This setup of 'result' is for backward compatibility and is best
446 ignored by the user who should use target, host + driver status */
447 case DID_OK:
448 case DID_PASSTHROUGH:
449 case DID_SOFT_ERROR:
450 old_hdr->result = 0;
451 break;
452 case DID_NO_CONNECT:
453 case DID_BUS_BUSY:
454 case DID_TIME_OUT:
455 old_hdr->result = EBUSY;
456 break;
457 case DID_BAD_TARGET:
458 case DID_ABORT:
459 case DID_PARITY:
460 case DID_RESET:
461 case DID_BAD_INTR:
462 old_hdr->result = EIO;
463 break;
464 case DID_ERROR:
465 old_hdr->result = (srp->sense_b[0] == 0 &&
466 hp->masked_status == GOOD) ? 0 : EIO;
467 break;
468 default:
469 old_hdr->result = EIO;
470 break;
471 }
472
473 /* Now copy the result back to the user buffer. */
474 if (count >= SZ_SG_HEADER) {
475 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
476 retval = -EFAULT;
477 goto free_old_hdr;
478 }
479 buf += SZ_SG_HEADER;
480 if (count > old_hdr->reply_len)
481 count = old_hdr->reply_len;
482 if (count > SZ_SG_HEADER) {
483 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
484 retval = -EFAULT;
485 goto free_old_hdr;
486 }
487 }
488 } else
489 count = (old_hdr->result == 0) ? 0 : -EIO;
490 sg_finish_rem_req(srp);
491 retval = count;
492 free_old_hdr:
493 kfree(old_hdr);
494 return retval;
495 }
496
497 static ssize_t
498 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
499 {
500 sg_io_hdr_t *hp = &srp->header;
501 int err = 0;
502 int len;
503
504 if (count < SZ_SG_IO_HDR) {
505 err = -EINVAL;
506 goto err_out;
507 }
508 hp->sb_len_wr = 0;
509 if ((hp->mx_sb_len > 0) && hp->sbp) {
510 if ((CHECK_CONDITION & hp->masked_status) ||
511 (DRIVER_SENSE & hp->driver_status)) {
512 int sb_len = SCSI_SENSE_BUFFERSIZE;
513 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
514 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
515 len = (len > sb_len) ? sb_len : len;
516 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
517 err = -EFAULT;
518 goto err_out;
519 }
520 hp->sb_len_wr = len;
521 }
522 }
523 if (hp->masked_status || hp->host_status || hp->driver_status)
524 hp->info |= SG_INFO_CHECK;
525 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
526 err = -EFAULT;
527 goto err_out;
528 }
529 err_out:
530 sg_finish_rem_req(srp);
531 return (0 == err) ? count : err;
532 }
533
534 static ssize_t
535 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
536 {
537 int mxsize, cmd_size, k;
538 int input_size, blocking;
539 unsigned char opcode;
540 Sg_device *sdp;
541 Sg_fd *sfp;
542 Sg_request *srp;
543 struct sg_header old_hdr;
544 sg_io_hdr_t *hp;
545 unsigned char cmnd[MAX_COMMAND_SIZE];
546
547 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
548 return -ENXIO;
549 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
550 sdp->disk->disk_name, (int) count));
551 if (sdp->detached)
552 return -ENODEV;
553 if (!((filp->f_flags & O_NONBLOCK) ||
554 scsi_block_when_processing_errors(sdp->device)))
555 return -ENXIO;
556
557 if (!access_ok(VERIFY_READ, buf, count))
558 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
559 if (count < SZ_SG_HEADER)
560 return -EIO;
561 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
562 return -EFAULT;
563 blocking = !(filp->f_flags & O_NONBLOCK);
564 if (old_hdr.reply_len < 0)
565 return sg_new_write(sfp, filp, buf, count,
566 blocking, 0, 0, NULL);
567 if (count < (SZ_SG_HEADER + 6))
568 return -EIO; /* The minimum scsi command length is 6 bytes. */
569
570 if (!(srp = sg_add_request(sfp))) {
571 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
572 return -EDOM;
573 }
574 buf += SZ_SG_HEADER;
575 __get_user(opcode, buf);
576 if (sfp->next_cmd_len > 0) {
577 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
578 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
579 sfp->next_cmd_len = 0;
580 sg_remove_request(sfp, srp);
581 return -EIO;
582 }
583 cmd_size = sfp->next_cmd_len;
584 sfp->next_cmd_len = 0; /* reset so only this write() effected */
585 } else {
586 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
587 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
588 cmd_size = 12;
589 }
590 SCSI_LOG_TIMEOUT(4, printk(
591 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
592 /* Determine buffer size. */
593 input_size = count - cmd_size;
594 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
595 mxsize -= SZ_SG_HEADER;
596 input_size -= SZ_SG_HEADER;
597 if (input_size < 0) {
598 sg_remove_request(sfp, srp);
599 return -EIO; /* User did not pass enough bytes for this command. */
600 }
601 hp = &srp->header;
602 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
603 hp->cmd_len = (unsigned char) cmd_size;
604 hp->iovec_count = 0;
605 hp->mx_sb_len = 0;
606 if (input_size > 0)
607 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
608 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
609 else
610 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
611 hp->dxfer_len = mxsize;
612 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
613 hp->dxferp = (char __user *)buf + cmd_size;
614 else
615 hp->dxferp = NULL;
616 hp->sbp = NULL;
617 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
618 hp->flags = input_size; /* structure abuse ... */
619 hp->pack_id = old_hdr.pack_id;
620 hp->usr_ptr = NULL;
621 if (__copy_from_user(cmnd, buf, cmd_size))
622 return -EFAULT;
623 /*
624 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
625 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
626 * is a non-zero input_size, so emit a warning.
627 */
628 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
629 static char cmd[TASK_COMM_LEN];
630 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
631 printk(KERN_WARNING
632 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
633 "guessing data in;\n" KERN_WARNING " "
634 "program %s not setting count and/or reply_len properly\n",
635 old_hdr.reply_len - (int)SZ_SG_HEADER,
636 input_size, (unsigned int) cmnd[0],
637 current->comm);
638 strcpy(cmd, current->comm);
639 }
640 }
641 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
642 return (k < 0) ? k : count;
643 }
644
645 static ssize_t
646 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
647 size_t count, int blocking, int read_only, int sg_io_owned,
648 Sg_request **o_srp)
649 {
650 int k;
651 Sg_request *srp;
652 sg_io_hdr_t *hp;
653 unsigned char cmnd[MAX_COMMAND_SIZE];
654 int timeout;
655 unsigned long ul_timeout;
656
657 if (count < SZ_SG_IO_HDR)
658 return -EINVAL;
659 if (!access_ok(VERIFY_READ, buf, count))
660 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
661
662 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
663 if (!(srp = sg_add_request(sfp))) {
664 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
665 return -EDOM;
666 }
667 srp->sg_io_owned = sg_io_owned;
668 hp = &srp->header;
669 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
670 sg_remove_request(sfp, srp);
671 return -EFAULT;
672 }
673 if (hp->interface_id != 'S') {
674 sg_remove_request(sfp, srp);
675 return -ENOSYS;
676 }
677 if (hp->flags & SG_FLAG_MMAP_IO) {
678 if (hp->dxfer_len > sfp->reserve.bufflen) {
679 sg_remove_request(sfp, srp);
680 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
681 }
682 if (hp->flags & SG_FLAG_DIRECT_IO) {
683 sg_remove_request(sfp, srp);
684 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
685 }
686 if (sg_res_in_use(sfp)) {
687 sg_remove_request(sfp, srp);
688 return -EBUSY; /* reserve buffer already being used */
689 }
690 }
691 ul_timeout = msecs_to_jiffies(srp->header.timeout);
692 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
693 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
694 sg_remove_request(sfp, srp);
695 return -EMSGSIZE;
696 }
697 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
698 sg_remove_request(sfp, srp);
699 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
700 }
701 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
702 sg_remove_request(sfp, srp);
703 return -EFAULT;
704 }
705 if (read_only && sg_allow_access(file, cmnd)) {
706 sg_remove_request(sfp, srp);
707 return -EPERM;
708 }
709 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
710 if (k < 0)
711 return k;
712 if (o_srp)
713 *o_srp = srp;
714 return count;
715 }
716
717 static int
718 sg_common_write(Sg_fd * sfp, Sg_request * srp,
719 unsigned char *cmnd, int timeout, int blocking)
720 {
721 int k, data_dir;
722 Sg_device *sdp = sfp->parentdp;
723 sg_io_hdr_t *hp = &srp->header;
724
725 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
726 hp->status = 0;
727 hp->masked_status = 0;
728 hp->msg_status = 0;
729 hp->info = 0;
730 hp->host_status = 0;
731 hp->driver_status = 0;
732 hp->resid = 0;
733 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
734 (int) cmnd[0], (int) hp->cmd_len));
735
736 k = sg_start_req(srp, cmnd);
737 if (k) {
738 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
739 sg_finish_rem_req(srp);
740 return k; /* probably out of space --> ENOMEM */
741 }
742 if (sdp->detached) {
743 sg_finish_rem_req(srp);
744 return -ENODEV;
745 }
746
747 switch (hp->dxfer_direction) {
748 case SG_DXFER_TO_FROM_DEV:
749 case SG_DXFER_FROM_DEV:
750 data_dir = DMA_FROM_DEVICE;
751 break;
752 case SG_DXFER_TO_DEV:
753 data_dir = DMA_TO_DEVICE;
754 break;
755 case SG_DXFER_UNKNOWN:
756 data_dir = DMA_BIDIRECTIONAL;
757 break;
758 default:
759 data_dir = DMA_NONE;
760 break;
761 }
762 hp->duration = jiffies_to_msecs(jiffies);
763
764 srp->rq->timeout = timeout;
765 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
766 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
767 srp->rq, 1, sg_rq_end_io);
768 return 0;
769 }
770
771 static int
772 sg_ioctl(struct inode *inode, struct file *filp,
773 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 sdp->device->request_queue->max_sectors * 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 sdp->device->request_queue->max_sectors * 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(sdp->device->request_queue->max_sectors * 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 (char *)arg);
1078 case BLKTRACESTART:
1079 return blk_trace_startstop(sdp->device->request_queue, 1);
1080 case BLKTRACESTOP:
1081 return blk_trace_startstop(sdp->device->request_queue, 0);
1082 case BLKTRACETEARDOWN:
1083 return blk_trace_remove(sdp->device->request_queue);
1084 default:
1085 if (read_only)
1086 return -EPERM; /* don't know so take safe approach */
1087 return scsi_ioctl(sdp->device, cmd_in, p);
1088 }
1089 }
1090
1091 #ifdef CONFIG_COMPAT
1092 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1093 {
1094 Sg_device *sdp;
1095 Sg_fd *sfp;
1096 struct scsi_device *sdev;
1097
1098 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1099 return -ENXIO;
1100
1101 sdev = sdp->device;
1102 if (sdev->host->hostt->compat_ioctl) {
1103 int ret;
1104
1105 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1106
1107 return ret;
1108 }
1109
1110 return -ENOIOCTLCMD;
1111 }
1112 #endif
1113
1114 static unsigned int
1115 sg_poll(struct file *filp, poll_table * wait)
1116 {
1117 unsigned int res = 0;
1118 Sg_device *sdp;
1119 Sg_fd *sfp;
1120 Sg_request *srp;
1121 int count = 0;
1122 unsigned long iflags;
1123
1124 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1125 || sfp->closed)
1126 return POLLERR;
1127 poll_wait(filp, &sfp->read_wait, wait);
1128 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1129 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1130 /* if any read waiting, flag it */
1131 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1132 res = POLLIN | POLLRDNORM;
1133 ++count;
1134 }
1135 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1136
1137 if (sdp->detached)
1138 res |= POLLHUP;
1139 else if (!sfp->cmd_q) {
1140 if (0 == count)
1141 res |= POLLOUT | POLLWRNORM;
1142 } else if (count < SG_MAX_QUEUE)
1143 res |= POLLOUT | POLLWRNORM;
1144 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1145 sdp->disk->disk_name, (int) res));
1146 return res;
1147 }
1148
1149 static int
1150 sg_fasync(int fd, struct file *filp, int mode)
1151 {
1152 int retval;
1153 Sg_device *sdp;
1154 Sg_fd *sfp;
1155
1156 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1157 return -ENXIO;
1158 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1159 sdp->disk->disk_name, mode));
1160
1161 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1162 return (retval < 0) ? retval : 0;
1163 }
1164
1165 static int
1166 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1167 {
1168 Sg_fd *sfp;
1169 unsigned long offset, len, sa;
1170 Sg_scatter_hold *rsv_schp;
1171 int k, length;
1172
1173 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1174 return VM_FAULT_SIGBUS;
1175 rsv_schp = &sfp->reserve;
1176 offset = vmf->pgoff << PAGE_SHIFT;
1177 if (offset >= rsv_schp->bufflen)
1178 return VM_FAULT_SIGBUS;
1179 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1180 offset, rsv_schp->k_use_sg));
1181 sa = vma->vm_start;
1182 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1183 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1184 len = vma->vm_end - sa;
1185 len = (len < length) ? len : length;
1186 if (offset < len) {
1187 struct page *page = nth_page(rsv_schp->pages[k],
1188 offset >> PAGE_SHIFT);
1189 get_page(page); /* increment page count */
1190 vmf->page = page;
1191 return 0; /* success */
1192 }
1193 sa += len;
1194 offset -= len;
1195 }
1196
1197 return VM_FAULT_SIGBUS;
1198 }
1199
1200 static struct vm_operations_struct sg_mmap_vm_ops = {
1201 .fault = sg_vma_fault,
1202 };
1203
1204 static int
1205 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1206 {
1207 Sg_fd *sfp;
1208 unsigned long req_sz, len, sa;
1209 Sg_scatter_hold *rsv_schp;
1210 int k, length;
1211
1212 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1213 return -ENXIO;
1214 req_sz = vma->vm_end - vma->vm_start;
1215 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1216 (void *) vma->vm_start, (int) req_sz));
1217 if (vma->vm_pgoff)
1218 return -EINVAL; /* want no offset */
1219 rsv_schp = &sfp->reserve;
1220 if (req_sz > rsv_schp->bufflen)
1221 return -ENOMEM; /* cannot map more than reserved buffer */
1222
1223 sa = vma->vm_start;
1224 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1225 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1226 len = vma->vm_end - sa;
1227 len = (len < length) ? len : length;
1228 sa += len;
1229 }
1230
1231 sfp->mmap_called = 1;
1232 vma->vm_flags |= VM_RESERVED;
1233 vma->vm_private_data = sfp;
1234 vma->vm_ops = &sg_mmap_vm_ops;
1235 return 0;
1236 }
1237
1238 static void sg_rq_end_io_usercontext(struct work_struct *work)
1239 {
1240 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1241 struct sg_fd *sfp = srp->parentfp;
1242
1243 sg_finish_rem_req(srp);
1244 kref_put(&sfp->f_ref, sg_remove_sfp);
1245 }
1246
1247 /*
1248 * This function is a "bottom half" handler that is called by the mid
1249 * level when a command is completed (or has failed).
1250 */
1251 static void sg_rq_end_io(struct request *rq, int uptodate)
1252 {
1253 struct sg_request *srp = rq->end_io_data;
1254 Sg_device *sdp;
1255 Sg_fd *sfp;
1256 unsigned long iflags;
1257 unsigned int ms;
1258 char *sense;
1259 int result, resid, done = 1;
1260
1261 if (WARN_ON(srp->done != 0))
1262 return;
1263
1264 sfp = srp->parentfp;
1265 if (WARN_ON(sfp == NULL))
1266 return;
1267
1268 sdp = sfp->parentdp;
1269 if (unlikely(sdp->detached))
1270 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1271
1272 sense = rq->sense;
1273 result = rq->errors;
1274 resid = rq->data_len;
1275
1276 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1277 sdp->disk->disk_name, srp->header.pack_id, result));
1278 srp->header.resid = resid;
1279 ms = jiffies_to_msecs(jiffies);
1280 srp->header.duration = (ms > srp->header.duration) ?
1281 (ms - srp->header.duration) : 0;
1282 if (0 != result) {
1283 struct scsi_sense_hdr sshdr;
1284
1285 srp->header.status = 0xff & result;
1286 srp->header.masked_status = status_byte(result);
1287 srp->header.msg_status = msg_byte(result);
1288 srp->header.host_status = host_byte(result);
1289 srp->header.driver_status = driver_byte(result);
1290 if ((sdp->sgdebug > 0) &&
1291 ((CHECK_CONDITION == srp->header.masked_status) ||
1292 (COMMAND_TERMINATED == srp->header.masked_status)))
1293 __scsi_print_sense("sg_cmd_done", sense,
1294 SCSI_SENSE_BUFFERSIZE);
1295
1296 /* Following if statement is a patch supplied by Eric Youngdale */
1297 if (driver_byte(result) != 0
1298 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1299 && !scsi_sense_is_deferred(&sshdr)
1300 && sshdr.sense_key == UNIT_ATTENTION
1301 && sdp->device->removable) {
1302 /* Detected possible disc change. Set the bit - this */
1303 /* may be used if there are filesystems using this device */
1304 sdp->device->changed = 1;
1305 }
1306 }
1307 /* Rely on write phase to clean out srp status values, so no "else" */
1308
1309 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1310 if (unlikely(srp->orphan)) {
1311 if (sfp->keep_orphan)
1312 srp->sg_io_owned = 0;
1313 else
1314 done = 0;
1315 }
1316 srp->done = done;
1317 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1318
1319 if (likely(done)) {
1320 /* Now wake up any sg_read() that is waiting for this
1321 * packet.
1322 */
1323 wake_up_interruptible(&sfp->read_wait);
1324 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1325 kref_put(&sfp->f_ref, sg_remove_sfp);
1326 } else {
1327 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1328 schedule_work(&srp->ew.work);
1329 }
1330 }
1331
1332 static struct file_operations sg_fops = {
1333 .owner = THIS_MODULE,
1334 .read = sg_read,
1335 .write = sg_write,
1336 .poll = sg_poll,
1337 .ioctl = sg_ioctl,
1338 #ifdef CONFIG_COMPAT
1339 .compat_ioctl = sg_compat_ioctl,
1340 #endif
1341 .open = sg_open,
1342 .mmap = sg_mmap,
1343 .release = sg_release,
1344 .fasync = sg_fasync,
1345 };
1346
1347 static struct class *sg_sysfs_class;
1348
1349 static int sg_sysfs_valid = 0;
1350
1351 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1352 {
1353 struct request_queue *q = scsidp->request_queue;
1354 Sg_device *sdp;
1355 unsigned long iflags;
1356 int error;
1357 u32 k;
1358
1359 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1360 if (!sdp) {
1361 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1362 return ERR_PTR(-ENOMEM);
1363 }
1364
1365 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1366 printk(KERN_WARNING "idr expansion Sg_device failure\n");
1367 error = -ENOMEM;
1368 goto out;
1369 }
1370
1371 write_lock_irqsave(&sg_index_lock, iflags);
1372
1373 error = idr_get_new(&sg_index_idr, sdp, &k);
1374 if (error) {
1375 write_unlock_irqrestore(&sg_index_lock, iflags);
1376 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1377 error);
1378 goto out;
1379 }
1380
1381 if (unlikely(k >= SG_MAX_DEVS))
1382 goto overflow;
1383
1384 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1385 sprintf(disk->disk_name, "sg%d", k);
1386 disk->first_minor = k;
1387 sdp->disk = disk;
1388 sdp->device = scsidp;
1389 init_waitqueue_head(&sdp->o_excl_wait);
1390 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
1391 sdp->index = k;
1392 kref_init(&sdp->d_ref);
1393
1394 write_unlock_irqrestore(&sg_index_lock, iflags);
1395
1396 error = 0;
1397 out:
1398 if (error) {
1399 kfree(sdp);
1400 return ERR_PTR(error);
1401 }
1402 return sdp;
1403
1404 overflow:
1405 idr_remove(&sg_index_idr, k);
1406 write_unlock_irqrestore(&sg_index_lock, iflags);
1407 sdev_printk(KERN_WARNING, scsidp,
1408 "Unable to attach sg device type=%d, minor "
1409 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1410 error = -ENODEV;
1411 goto out;
1412 }
1413
1414 static int
1415 sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1416 {
1417 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1418 struct gendisk *disk;
1419 Sg_device *sdp = NULL;
1420 struct cdev * cdev = NULL;
1421 int error;
1422 unsigned long iflags;
1423
1424 disk = alloc_disk(1);
1425 if (!disk) {
1426 printk(KERN_WARNING "alloc_disk failed\n");
1427 return -ENOMEM;
1428 }
1429 disk->major = SCSI_GENERIC_MAJOR;
1430
1431 error = -ENOMEM;
1432 cdev = cdev_alloc();
1433 if (!cdev) {
1434 printk(KERN_WARNING "cdev_alloc failed\n");
1435 goto out;
1436 }
1437 cdev->owner = THIS_MODULE;
1438 cdev->ops = &sg_fops;
1439
1440 sdp = sg_alloc(disk, scsidp);
1441 if (IS_ERR(sdp)) {
1442 printk(KERN_WARNING "sg_alloc failed\n");
1443 error = PTR_ERR(sdp);
1444 goto out;
1445 }
1446
1447 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1448 if (error)
1449 goto cdev_add_err;
1450
1451 sdp->cdev = cdev;
1452 if (sg_sysfs_valid) {
1453 struct device *sg_class_member;
1454
1455 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1456 MKDEV(SCSI_GENERIC_MAJOR,
1457 sdp->index),
1458 sdp, "%s", disk->disk_name);
1459 if (IS_ERR(sg_class_member)) {
1460 printk(KERN_ERR "sg_add: "
1461 "device_create failed\n");
1462 error = PTR_ERR(sg_class_member);
1463 goto cdev_add_err;
1464 }
1465 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1466 &sg_class_member->kobj, "generic");
1467 if (error)
1468 printk(KERN_ERR "sg_add: unable to make symlink "
1469 "'generic' back to sg%d\n", sdp->index);
1470 } else
1471 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1472
1473 sdev_printk(KERN_NOTICE, scsidp,
1474 "Attached scsi generic sg%d type %d\n", sdp->index,
1475 scsidp->type);
1476
1477 dev_set_drvdata(cl_dev, sdp);
1478
1479 return 0;
1480
1481 cdev_add_err:
1482 write_lock_irqsave(&sg_index_lock, iflags);
1483 idr_remove(&sg_index_idr, sdp->index);
1484 write_unlock_irqrestore(&sg_index_lock, iflags);
1485 kfree(sdp);
1486
1487 out:
1488 put_disk(disk);
1489 if (cdev)
1490 cdev_del(cdev);
1491 return error;
1492 }
1493
1494 static void sg_device_destroy(struct kref *kref)
1495 {
1496 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1497 unsigned long flags;
1498
1499 /* CAUTION! Note that the device can still be found via idr_find()
1500 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1501 * any other cleanup.
1502 */
1503
1504 write_lock_irqsave(&sg_index_lock, flags);
1505 idr_remove(&sg_index_idr, sdp->index);
1506 write_unlock_irqrestore(&sg_index_lock, flags);
1507
1508 SCSI_LOG_TIMEOUT(3,
1509 printk("sg_device_destroy: %s\n",
1510 sdp->disk->disk_name));
1511
1512 put_disk(sdp->disk);
1513 kfree(sdp);
1514 }
1515
1516 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1517 {
1518 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1519 Sg_device *sdp = dev_get_drvdata(cl_dev);
1520 unsigned long iflags;
1521 Sg_fd *sfp;
1522
1523 if (!sdp || sdp->detached)
1524 return;
1525
1526 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1527
1528 /* Need a write lock to set sdp->detached. */
1529 write_lock_irqsave(&sg_index_lock, iflags);
1530 sdp->detached = 1;
1531 for (sfp = sdp->headfp; sfp; sfp = sfp->nextfp) {
1532 wake_up_interruptible(&sfp->read_wait);
1533 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1534 }
1535 write_unlock_irqrestore(&sg_index_lock, iflags);
1536
1537 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1538 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1539 cdev_del(sdp->cdev);
1540 sdp->cdev = NULL;
1541
1542 sg_put_dev(sdp);
1543 }
1544
1545 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1546 module_param_named(def_reserved_size, def_reserved_size, int,
1547 S_IRUGO | S_IWUSR);
1548 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1549
1550 MODULE_AUTHOR("Douglas Gilbert");
1551 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1552 MODULE_LICENSE("GPL");
1553 MODULE_VERSION(SG_VERSION_STR);
1554 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1555
1556 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1557 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1558 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1559 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1560
1561 static int __init
1562 init_sg(void)
1563 {
1564 int rc;
1565
1566 if (scatter_elem_sz < PAGE_SIZE) {
1567 scatter_elem_sz = PAGE_SIZE;
1568 scatter_elem_sz_prev = scatter_elem_sz;
1569 }
1570 if (def_reserved_size >= 0)
1571 sg_big_buff = def_reserved_size;
1572 else
1573 def_reserved_size = sg_big_buff;
1574
1575 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1576 SG_MAX_DEVS, "sg");
1577 if (rc)
1578 return rc;
1579 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1580 if ( IS_ERR(sg_sysfs_class) ) {
1581 rc = PTR_ERR(sg_sysfs_class);
1582 goto err_out;
1583 }
1584 sg_sysfs_valid = 1;
1585 rc = scsi_register_interface(&sg_interface);
1586 if (0 == rc) {
1587 #ifdef CONFIG_SCSI_PROC_FS
1588 sg_proc_init();
1589 #endif /* CONFIG_SCSI_PROC_FS */
1590 return 0;
1591 }
1592 class_destroy(sg_sysfs_class);
1593 err_out:
1594 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1595 return rc;
1596 }
1597
1598 static void __exit
1599 exit_sg(void)
1600 {
1601 #ifdef CONFIG_SCSI_PROC_FS
1602 sg_proc_cleanup();
1603 #endif /* CONFIG_SCSI_PROC_FS */
1604 scsi_unregister_interface(&sg_interface);
1605 class_destroy(sg_sysfs_class);
1606 sg_sysfs_valid = 0;
1607 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1608 SG_MAX_DEVS);
1609 idr_destroy(&sg_index_idr);
1610 }
1611
1612 static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1613 {
1614 int res;
1615 struct request *rq;
1616 Sg_fd *sfp = srp->parentfp;
1617 sg_io_hdr_t *hp = &srp->header;
1618 int dxfer_len = (int) hp->dxfer_len;
1619 int dxfer_dir = hp->dxfer_direction;
1620 unsigned int iov_count = hp->iovec_count;
1621 Sg_scatter_hold *req_schp = &srp->data;
1622 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1623 struct request_queue *q = sfp->parentdp->device->request_queue;
1624 struct rq_map_data *md, map_data;
1625 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1626
1627 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1628 dxfer_len));
1629
1630 rq = blk_get_request(q, rw, GFP_ATOMIC);
1631 if (!rq)
1632 return -ENOMEM;
1633
1634 memcpy(rq->cmd, cmd, hp->cmd_len);
1635
1636 rq->cmd_len = hp->cmd_len;
1637 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1638
1639 srp->rq = rq;
1640 rq->end_io_data = srp;
1641 rq->sense = srp->sense_b;
1642 rq->retries = SG_DEFAULT_RETRIES;
1643
1644 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1645 return 0;
1646
1647 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1648 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1649 !sfp->parentdp->device->host->unchecked_isa_dma &&
1650 blk_rq_aligned(q, hp->dxferp, dxfer_len))
1651 md = NULL;
1652 else
1653 md = &map_data;
1654
1655 if (md) {
1656 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1657 sg_link_reserve(sfp, srp, dxfer_len);
1658 else {
1659 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1660 if (res)
1661 return res;
1662 }
1663
1664 md->pages = req_schp->pages;
1665 md->page_order = req_schp->page_order;
1666 md->nr_entries = req_schp->k_use_sg;
1667 md->offset = 0;
1668 md->null_mapped = hp->dxferp ? 0 : 1;
1669 }
1670
1671 if (iov_count) {
1672 int len, size = sizeof(struct sg_iovec) * iov_count;
1673 struct iovec *iov;
1674
1675 iov = kmalloc(size, GFP_ATOMIC);
1676 if (!iov)
1677 return -ENOMEM;
1678
1679 if (copy_from_user(iov, hp->dxferp, size)) {
1680 kfree(iov);
1681 return -EFAULT;
1682 }
1683
1684 len = iov_length(iov, iov_count);
1685 if (hp->dxfer_len < len) {
1686 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1687 len = hp->dxfer_len;
1688 }
1689
1690 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1691 iov_count,
1692 len, GFP_ATOMIC);
1693 kfree(iov);
1694 } else
1695 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1696 hp->dxfer_len, GFP_ATOMIC);
1697
1698 if (!res) {
1699 srp->bio = rq->bio;
1700
1701 if (!md) {
1702 req_schp->dio_in_use = 1;
1703 hp->info |= SG_INFO_DIRECT_IO;
1704 }
1705 }
1706 return res;
1707 }
1708
1709 static void
1710 sg_finish_rem_req(Sg_request * srp)
1711 {
1712 Sg_fd *sfp = srp->parentfp;
1713 Sg_scatter_hold *req_schp = &srp->data;
1714
1715 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1716 if (srp->res_used)
1717 sg_unlink_reserve(sfp, srp);
1718 else
1719 sg_remove_scat(req_schp);
1720
1721 if (srp->rq) {
1722 if (srp->bio)
1723 blk_rq_unmap_user(srp->bio);
1724
1725 blk_put_request(srp->rq);
1726 }
1727
1728 sg_remove_request(sfp, srp);
1729 }
1730
1731 static int
1732 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1733 {
1734 int sg_bufflen = tablesize * sizeof(struct page *);
1735 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1736
1737 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1738 if (!schp->pages)
1739 return -ENOMEM;
1740 schp->sglist_len = sg_bufflen;
1741 return tablesize; /* number of scat_gath elements allocated */
1742 }
1743
1744 static int
1745 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1746 {
1747 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1748 int sg_tablesize = sfp->parentdp->sg_tablesize;
1749 int blk_size = buff_size, order;
1750 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1751
1752 if (blk_size < 0)
1753 return -EFAULT;
1754 if (0 == blk_size)
1755 ++blk_size; /* don't know why */
1756 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1757 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1758 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1759 buff_size, blk_size));
1760
1761 /* N.B. ret_sz carried into this block ... */
1762 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1763 if (mx_sc_elems < 0)
1764 return mx_sc_elems; /* most likely -ENOMEM */
1765
1766 num = scatter_elem_sz;
1767 if (unlikely(num != scatter_elem_sz_prev)) {
1768 if (num < PAGE_SIZE) {
1769 scatter_elem_sz = PAGE_SIZE;
1770 scatter_elem_sz_prev = PAGE_SIZE;
1771 } else
1772 scatter_elem_sz_prev = num;
1773 }
1774
1775 if (sfp->low_dma)
1776 gfp_mask |= GFP_DMA;
1777
1778 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1779 gfp_mask |= __GFP_ZERO;
1780
1781 order = get_order(num);
1782 retry:
1783 ret_sz = 1 << (PAGE_SHIFT + order);
1784
1785 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1786 k++, rem_sz -= ret_sz) {
1787
1788 num = (rem_sz > scatter_elem_sz_prev) ?
1789 scatter_elem_sz_prev : rem_sz;
1790
1791 schp->pages[k] = alloc_pages(gfp_mask, order);
1792 if (!schp->pages[k])
1793 goto out;
1794
1795 if (num == scatter_elem_sz_prev) {
1796 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1797 scatter_elem_sz = ret_sz;
1798 scatter_elem_sz_prev = ret_sz;
1799 }
1800 }
1801
1802 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1803 "ret_sz=%d\n", k, num, ret_sz));
1804 } /* end of for loop */
1805
1806 schp->page_order = order;
1807 schp->k_use_sg = k;
1808 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1809 "rem_sz=%d\n", k, rem_sz));
1810
1811 schp->bufflen = blk_size;
1812 if (rem_sz > 0) /* must have failed */
1813 return -ENOMEM;
1814 return 0;
1815 out:
1816 for (i = 0; i < k; i++)
1817 __free_pages(schp->pages[k], order);
1818
1819 if (--order >= 0)
1820 goto retry;
1821
1822 return -ENOMEM;
1823 }
1824
1825 static void
1826 sg_remove_scat(Sg_scatter_hold * schp)
1827 {
1828 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1829 if (schp->pages && schp->sglist_len > 0) {
1830 if (!schp->dio_in_use) {
1831 int k;
1832
1833 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1834 SCSI_LOG_TIMEOUT(5, printk(
1835 "sg_remove_scat: k=%d, pg=0x%p\n",
1836 k, schp->pages[k]));
1837 __free_pages(schp->pages[k], schp->page_order);
1838 }
1839
1840 kfree(schp->pages);
1841 }
1842 }
1843 memset(schp, 0, sizeof (*schp));
1844 }
1845
1846 static int
1847 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1848 {
1849 Sg_scatter_hold *schp = &srp->data;
1850 int k, num;
1851
1852 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1853 num_read_xfer));
1854 if ((!outp) || (num_read_xfer <= 0))
1855 return 0;
1856
1857 num = 1 << (PAGE_SHIFT + schp->page_order);
1858 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1859 if (num > num_read_xfer) {
1860 if (__copy_to_user(outp, page_address(schp->pages[k]),
1861 num_read_xfer))
1862 return -EFAULT;
1863 break;
1864 } else {
1865 if (__copy_to_user(outp, page_address(schp->pages[k]),
1866 num))
1867 return -EFAULT;
1868 num_read_xfer -= num;
1869 if (num_read_xfer <= 0)
1870 break;
1871 outp += num;
1872 }
1873 }
1874
1875 return 0;
1876 }
1877
1878 static void
1879 sg_build_reserve(Sg_fd * sfp, int req_size)
1880 {
1881 Sg_scatter_hold *schp = &sfp->reserve;
1882
1883 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1884 do {
1885 if (req_size < PAGE_SIZE)
1886 req_size = PAGE_SIZE;
1887 if (0 == sg_build_indirect(schp, sfp, req_size))
1888 return;
1889 else
1890 sg_remove_scat(schp);
1891 req_size >>= 1; /* divide by 2 */
1892 } while (req_size > (PAGE_SIZE / 2));
1893 }
1894
1895 static void
1896 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1897 {
1898 Sg_scatter_hold *req_schp = &srp->data;
1899 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1900 int k, num, rem;
1901
1902 srp->res_used = 1;
1903 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1904 rem = size;
1905
1906 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1907 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1908 if (rem <= num) {
1909 req_schp->k_use_sg = k + 1;
1910 req_schp->sglist_len = rsv_schp->sglist_len;
1911 req_schp->pages = rsv_schp->pages;
1912
1913 req_schp->bufflen = size;
1914 req_schp->page_order = rsv_schp->page_order;
1915 break;
1916 } else
1917 rem -= num;
1918 }
1919
1920 if (k >= rsv_schp->k_use_sg)
1921 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1922 }
1923
1924 static void
1925 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1926 {
1927 Sg_scatter_hold *req_schp = &srp->data;
1928
1929 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1930 (int) req_schp->k_use_sg));
1931 req_schp->k_use_sg = 0;
1932 req_schp->bufflen = 0;
1933 req_schp->pages = NULL;
1934 req_schp->page_order = 0;
1935 req_schp->sglist_len = 0;
1936 sfp->save_scat_len = 0;
1937 srp->res_used = 0;
1938 }
1939
1940 static Sg_request *
1941 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1942 {
1943 Sg_request *resp;
1944 unsigned long iflags;
1945
1946 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1947 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1948 /* look for requests that are ready + not SG_IO owned */
1949 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1950 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1951 resp->done = 2; /* guard against other readers */
1952 break;
1953 }
1954 }
1955 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1956 return resp;
1957 }
1958
1959 /* always adds to end of list */
1960 static Sg_request *
1961 sg_add_request(Sg_fd * sfp)
1962 {
1963 int k;
1964 unsigned long iflags;
1965 Sg_request *resp;
1966 Sg_request *rp = sfp->req_arr;
1967
1968 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1969 resp = sfp->headrp;
1970 if (!resp) {
1971 memset(rp, 0, sizeof (Sg_request));
1972 rp->parentfp = sfp;
1973 resp = rp;
1974 sfp->headrp = resp;
1975 } else {
1976 if (0 == sfp->cmd_q)
1977 resp = NULL; /* command queuing disallowed */
1978 else {
1979 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
1980 if (!rp->parentfp)
1981 break;
1982 }
1983 if (k < SG_MAX_QUEUE) {
1984 memset(rp, 0, sizeof (Sg_request));
1985 rp->parentfp = sfp;
1986 while (resp->nextrp)
1987 resp = resp->nextrp;
1988 resp->nextrp = rp;
1989 resp = rp;
1990 } else
1991 resp = NULL;
1992 }
1993 }
1994 if (resp) {
1995 resp->nextrp = NULL;
1996 resp->header.duration = jiffies_to_msecs(jiffies);
1997 }
1998 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1999 return resp;
2000 }
2001
2002 /* Return of 1 for found; 0 for not found */
2003 static int
2004 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2005 {
2006 Sg_request *prev_rp;
2007 Sg_request *rp;
2008 unsigned long iflags;
2009 int res = 0;
2010
2011 if ((!sfp) || (!srp) || (!sfp->headrp))
2012 return res;
2013 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2014 prev_rp = sfp->headrp;
2015 if (srp == prev_rp) {
2016 sfp->headrp = prev_rp->nextrp;
2017 prev_rp->parentfp = NULL;
2018 res = 1;
2019 } else {
2020 while ((rp = prev_rp->nextrp)) {
2021 if (srp == rp) {
2022 prev_rp->nextrp = rp->nextrp;
2023 rp->parentfp = NULL;
2024 res = 1;
2025 break;
2026 }
2027 prev_rp = rp;
2028 }
2029 }
2030 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2031 return res;
2032 }
2033
2034 static Sg_fd *
2035 sg_add_sfp(Sg_device * sdp, int dev)
2036 {
2037 Sg_fd *sfp;
2038 unsigned long iflags;
2039 int bufflen;
2040
2041 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2042 if (!sfp)
2043 return NULL;
2044
2045 init_waitqueue_head(&sfp->read_wait);
2046 rwlock_init(&sfp->rq_list_lock);
2047
2048 kref_init(&sfp->f_ref);
2049 sfp->timeout = SG_DEFAULT_TIMEOUT;
2050 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2051 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2052 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2053 sdp->device->host->unchecked_isa_dma : 1;
2054 sfp->cmd_q = SG_DEF_COMMAND_Q;
2055 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2056 sfp->parentdp = sdp;
2057 write_lock_irqsave(&sg_index_lock, iflags);
2058 if (!sdp->headfp)
2059 sdp->headfp = sfp;
2060 else { /* add to tail of existing list */
2061 Sg_fd *pfp = sdp->headfp;
2062 while (pfp->nextfp)
2063 pfp = pfp->nextfp;
2064 pfp->nextfp = sfp;
2065 }
2066 write_unlock_irqrestore(&sg_index_lock, iflags);
2067 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2068 if (unlikely(sg_big_buff != def_reserved_size))
2069 sg_big_buff = def_reserved_size;
2070
2071 bufflen = min_t(int, sg_big_buff,
2072 sdp->device->request_queue->max_sectors * 512);
2073 sg_build_reserve(sfp, bufflen);
2074 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2075 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2076
2077 kref_get(&sdp->d_ref);
2078 __module_get(THIS_MODULE);
2079 return sfp;
2080 }
2081
2082 static void sg_remove_sfp_usercontext(struct work_struct *work)
2083 {
2084 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2085 struct sg_device *sdp = sfp->parentdp;
2086
2087 /* Cleanup any responses which were never read(). */
2088 while (sfp->headrp)
2089 sg_finish_rem_req(sfp->headrp);
2090
2091 if (sfp->reserve.bufflen > 0) {
2092 SCSI_LOG_TIMEOUT(6,
2093 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2094 (int) sfp->reserve.bufflen,
2095 (int) sfp->reserve.k_use_sg));
2096 sg_remove_scat(&sfp->reserve);
2097 }
2098
2099 SCSI_LOG_TIMEOUT(6,
2100 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2101 sdp->disk->disk_name,
2102 sfp));
2103 kfree(sfp);
2104
2105 scsi_device_put(sdp->device);
2106 sg_put_dev(sdp);
2107 module_put(THIS_MODULE);
2108 }
2109
2110 static void sg_remove_sfp(struct kref *kref)
2111 {
2112 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2113 struct sg_device *sdp = sfp->parentdp;
2114 Sg_fd *fp;
2115 Sg_fd *prev_fp;
2116 unsigned long iflags;
2117
2118 /* CAUTION! Note that sfp can still be found by walking sdp->headfp
2119 * even though the refcount is now 0. Therefore, unlink sfp from
2120 * sdp->headfp BEFORE doing any other cleanup.
2121 */
2122
2123 write_lock_irqsave(&sg_index_lock, iflags);
2124 prev_fp = sdp->headfp;
2125 if (sfp == prev_fp)
2126 sdp->headfp = prev_fp->nextfp;
2127 else {
2128 while ((fp = prev_fp->nextfp)) {
2129 if (sfp == fp) {
2130 prev_fp->nextfp = fp->nextfp;
2131 break;
2132 }
2133 prev_fp = fp;
2134 }
2135 }
2136 write_unlock_irqrestore(&sg_index_lock, iflags);
2137 wake_up_interruptible(&sdp->o_excl_wait);
2138
2139 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2140 schedule_work(&sfp->ew.work);
2141 }
2142
2143 static int
2144 sg_res_in_use(Sg_fd * sfp)
2145 {
2146 const Sg_request *srp;
2147 unsigned long iflags;
2148
2149 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2150 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2151 if (srp->res_used)
2152 break;
2153 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2154 return srp ? 1 : 0;
2155 }
2156
2157 #ifdef CONFIG_SCSI_PROC_FS
2158 static int
2159 sg_idr_max_id(int id, void *p, void *data)
2160 {
2161 int *k = data;
2162
2163 if (*k < id)
2164 *k = id;
2165
2166 return 0;
2167 }
2168
2169 static int
2170 sg_last_dev(void)
2171 {
2172 int k = -1;
2173 unsigned long iflags;
2174
2175 read_lock_irqsave(&sg_index_lock, iflags);
2176 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2177 read_unlock_irqrestore(&sg_index_lock, iflags);
2178 return k + 1; /* origin 1 */
2179 }
2180 #endif
2181
2182 /* must be called with sg_index_lock held */
2183 static Sg_device *sg_lookup_dev(int dev)
2184 {
2185 return idr_find(&sg_index_idr, dev);
2186 }
2187
2188 static Sg_device *sg_get_dev(int dev)
2189 {
2190 struct sg_device *sdp;
2191 unsigned long flags;
2192
2193 read_lock_irqsave(&sg_index_lock, flags);
2194 sdp = sg_lookup_dev(dev);
2195 if (!sdp)
2196 sdp = ERR_PTR(-ENXIO);
2197 else if (sdp->detached) {
2198 /* If sdp->detached, then the refcount may already be 0, in
2199 * which case it would be a bug to do kref_get().
2200 */
2201 sdp = ERR_PTR(-ENODEV);
2202 } else
2203 kref_get(&sdp->d_ref);
2204 read_unlock_irqrestore(&sg_index_lock, flags);
2205
2206 return sdp;
2207 }
2208
2209 static void sg_put_dev(struct sg_device *sdp)
2210 {
2211 kref_put(&sdp->d_ref, sg_device_destroy);
2212 }
2213
2214 #ifdef CONFIG_SCSI_PROC_FS
2215
2216 static struct proc_dir_entry *sg_proc_sgp = NULL;
2217
2218 static char sg_proc_sg_dirname[] = "scsi/sg";
2219
2220 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2221
2222 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2223 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2224 size_t count, loff_t *off);
2225 static struct file_operations adio_fops = {
2226 /* .owner, .read and .llseek added in sg_proc_init() */
2227 .open = sg_proc_single_open_adio,
2228 .write = sg_proc_write_adio,
2229 .release = single_release,
2230 };
2231
2232 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2233 static ssize_t sg_proc_write_dressz(struct file *filp,
2234 const char __user *buffer, size_t count, loff_t *off);
2235 static struct file_operations dressz_fops = {
2236 .open = sg_proc_single_open_dressz,
2237 .write = sg_proc_write_dressz,
2238 .release = single_release,
2239 };
2240
2241 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2242 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2243 static struct file_operations version_fops = {
2244 .open = sg_proc_single_open_version,
2245 .release = single_release,
2246 };
2247
2248 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2249 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2250 static struct file_operations devhdr_fops = {
2251 .open = sg_proc_single_open_devhdr,
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 struct file_operations dev_fops = {
2261 .open = sg_proc_open_dev,
2262 .release = seq_release,
2263 };
2264 static struct seq_operations dev_seq_ops = {
2265 .start = dev_seq_start,
2266 .next = dev_seq_next,
2267 .stop = dev_seq_stop,
2268 .show = sg_proc_seq_show_dev,
2269 };
2270
2271 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2272 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2273 static struct file_operations devstrs_fops = {
2274 .open = sg_proc_open_devstrs,
2275 .release = seq_release,
2276 };
2277 static struct seq_operations devstrs_seq_ops = {
2278 .start = dev_seq_start,
2279 .next = dev_seq_next,
2280 .stop = dev_seq_stop,
2281 .show = sg_proc_seq_show_devstrs,
2282 };
2283
2284 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2285 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2286 static struct file_operations debug_fops = {
2287 .open = sg_proc_open_debug,
2288 .release = seq_release,
2289 };
2290 static struct seq_operations debug_seq_ops = {
2291 .start = dev_seq_start,
2292 .next = dev_seq_next,
2293 .stop = dev_seq_stop,
2294 .show = sg_proc_seq_show_debug,
2295 };
2296
2297
2298 struct sg_proc_leaf {
2299 const char * name;
2300 struct file_operations * fops;
2301 };
2302
2303 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2304 {"allow_dio", &adio_fops},
2305 {"debug", &debug_fops},
2306 {"def_reserved_size", &dressz_fops},
2307 {"device_hdr", &devhdr_fops},
2308 {"devices", &dev_fops},
2309 {"device_strs", &devstrs_fops},
2310 {"version", &version_fops}
2311 };
2312
2313 static int
2314 sg_proc_init(void)
2315 {
2316 int k, mask;
2317 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2318 struct sg_proc_leaf * leaf;
2319
2320 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2321 if (!sg_proc_sgp)
2322 return 1;
2323 for (k = 0; k < num_leaves; ++k) {
2324 leaf = &sg_proc_leaf_arr[k];
2325 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2326 leaf->fops->owner = THIS_MODULE;
2327 leaf->fops->read = seq_read;
2328 leaf->fops->llseek = seq_lseek;
2329 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2330 }
2331 return 0;
2332 }
2333
2334 static void
2335 sg_proc_cleanup(void)
2336 {
2337 int k;
2338 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2339
2340 if (!sg_proc_sgp)
2341 return;
2342 for (k = 0; k < num_leaves; ++k)
2343 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2344 remove_proc_entry(sg_proc_sg_dirname, NULL);
2345 }
2346
2347
2348 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2349 {
2350 seq_printf(s, "%d\n", *((int *)s->private));
2351 return 0;
2352 }
2353
2354 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2355 {
2356 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2357 }
2358
2359 static ssize_t
2360 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2361 size_t count, loff_t *off)
2362 {
2363 int num;
2364 char buff[11];
2365
2366 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2367 return -EACCES;
2368 num = (count < 10) ? count : 10;
2369 if (copy_from_user(buff, buffer, num))
2370 return -EFAULT;
2371 buff[num] = '\0';
2372 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2373 return count;
2374 }
2375
2376 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2377 {
2378 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2379 }
2380
2381 static ssize_t
2382 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2383 size_t count, loff_t *off)
2384 {
2385 int num;
2386 unsigned long k = ULONG_MAX;
2387 char buff[11];
2388
2389 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2390 return -EACCES;
2391 num = (count < 10) ? count : 10;
2392 if (copy_from_user(buff, buffer, num))
2393 return -EFAULT;
2394 buff[num] = '\0';
2395 k = simple_strtoul(buff, NULL, 10);
2396 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2397 sg_big_buff = k;
2398 return count;
2399 }
2400 return -ERANGE;
2401 }
2402
2403 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2404 {
2405 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2406 sg_version_date);
2407 return 0;
2408 }
2409
2410 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2411 {
2412 return single_open(file, sg_proc_seq_show_version, NULL);
2413 }
2414
2415 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2416 {
2417 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2418 "online\n");
2419 return 0;
2420 }
2421
2422 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2423 {
2424 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2425 }
2426
2427 struct sg_proc_deviter {
2428 loff_t index;
2429 size_t max;
2430 };
2431
2432 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2433 {
2434 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2435
2436 s->private = it;
2437 if (! it)
2438 return NULL;
2439
2440 it->index = *pos;
2441 it->max = sg_last_dev();
2442 if (it->index >= it->max)
2443 return NULL;
2444 return it;
2445 }
2446
2447 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2448 {
2449 struct sg_proc_deviter * it = s->private;
2450
2451 *pos = ++it->index;
2452 return (it->index < it->max) ? it : NULL;
2453 }
2454
2455 static void dev_seq_stop(struct seq_file *s, void *v)
2456 {
2457 kfree(s->private);
2458 }
2459
2460 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2461 {
2462 return seq_open(file, &dev_seq_ops);
2463 }
2464
2465 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2466 {
2467 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2468 Sg_device *sdp;
2469 struct scsi_device *scsidp;
2470 unsigned long iflags;
2471
2472 read_lock_irqsave(&sg_index_lock, iflags);
2473 sdp = it ? sg_lookup_dev(it->index) : NULL;
2474 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2475 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2476 scsidp->host->host_no, scsidp->channel,
2477 scsidp->id, scsidp->lun, (int) scsidp->type,
2478 1,
2479 (int) scsidp->queue_depth,
2480 (int) scsidp->device_busy,
2481 (int) scsi_device_online(scsidp));
2482 else
2483 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2484 read_unlock_irqrestore(&sg_index_lock, iflags);
2485 return 0;
2486 }
2487
2488 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2489 {
2490 return seq_open(file, &devstrs_seq_ops);
2491 }
2492
2493 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2494 {
2495 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2496 Sg_device *sdp;
2497 struct scsi_device *scsidp;
2498 unsigned long iflags;
2499
2500 read_lock_irqsave(&sg_index_lock, iflags);
2501 sdp = it ? sg_lookup_dev(it->index) : NULL;
2502 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2503 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2504 scsidp->vendor, scsidp->model, scsidp->rev);
2505 else
2506 seq_printf(s, "<no active device>\n");
2507 read_unlock_irqrestore(&sg_index_lock, iflags);
2508 return 0;
2509 }
2510
2511 /* must be called while holding sg_index_lock */
2512 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2513 {
2514 int k, m, new_interface, blen, usg;
2515 Sg_request *srp;
2516 Sg_fd *fp;
2517 const sg_io_hdr_t *hp;
2518 const char * cp;
2519 unsigned int ms;
2520
2521 for (k = 0, fp = sdp->headfp; fp != NULL; ++k, fp = fp->nextfp) {
2522 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2523 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2524 "(res)sgat=%d low_dma=%d\n", k + 1,
2525 jiffies_to_msecs(fp->timeout),
2526 fp->reserve.bufflen,
2527 (int) fp->reserve.k_use_sg,
2528 (int) fp->low_dma);
2529 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2530 (int) fp->cmd_q, (int) fp->force_packid,
2531 (int) fp->keep_orphan, (int) fp->closed);
2532 for (m = 0, srp = fp->headrp;
2533 srp != NULL;
2534 ++m, srp = srp->nextrp) {
2535 hp = &srp->header;
2536 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2537 if (srp->res_used) {
2538 if (new_interface &&
2539 (SG_FLAG_MMAP_IO & hp->flags))
2540 cp = " mmap>> ";
2541 else
2542 cp = " rb>> ";
2543 } else {
2544 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2545 cp = " dio>> ";
2546 else
2547 cp = " ";
2548 }
2549 seq_printf(s, cp);
2550 blen = srp->data.bufflen;
2551 usg = srp->data.k_use_sg;
2552 seq_printf(s, srp->done ?
2553 ((1 == srp->done) ? "rcv:" : "fin:")
2554 : "act:");
2555 seq_printf(s, " id=%d blen=%d",
2556 srp->header.pack_id, blen);
2557 if (srp->done)
2558 seq_printf(s, " dur=%d", hp->duration);
2559 else {
2560 ms = jiffies_to_msecs(jiffies);
2561 seq_printf(s, " t_o/elap=%d/%d",
2562 (new_interface ? hp->timeout :
2563 jiffies_to_msecs(fp->timeout)),
2564 (ms > hp->duration ? ms - hp->duration : 0));
2565 }
2566 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2567 (int) srp->data.cmd_opcode);
2568 }
2569 if (0 == m)
2570 seq_printf(s, " No requests active\n");
2571 read_unlock(&fp->rq_list_lock);
2572 }
2573 }
2574
2575 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2576 {
2577 return seq_open(file, &debug_seq_ops);
2578 }
2579
2580 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2581 {
2582 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2583 Sg_device *sdp;
2584 unsigned long iflags;
2585
2586 if (it && (0 == it->index)) {
2587 seq_printf(s, "max_active_device=%d(origin 1)\n",
2588 (int)it->max);
2589 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2590 }
2591
2592 read_lock_irqsave(&sg_index_lock, iflags);
2593 sdp = it ? sg_lookup_dev(it->index) : NULL;
2594 if (sdp && sdp->headfp) {
2595 struct scsi_device *scsidp = sdp->device;
2596
2597 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2598 if (sdp->detached)
2599 seq_printf(s, "detached pending close ");
2600 else
2601 seq_printf
2602 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2603 scsidp->host->host_no,
2604 scsidp->channel, scsidp->id,
2605 scsidp->lun,
2606 scsidp->host->hostt->emulated);
2607 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2608 sdp->sg_tablesize, sdp->exclude);
2609 sg_proc_debug_helper(s, sdp);
2610 }
2611 read_unlock_irqrestore(&sg_index_lock, iflags);
2612 return 0;
2613 }
2614
2615 #endif /* CONFIG_SCSI_PROC_FS */
2616
2617 module_init(init_sg);
2618 module_exit(exit_sg);
Support for the Chinese Samsung S3C2440 based development boards