?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[SCSI] fix oops on usb storage device disconnect
[linux-2.6.22.y-op.git] / drivers / scsi / sg.c
blob4d09a6e4dd2ea7143cbeece3813cbc869a211a7d
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 = 30533; /* 2 digits for each component */
22 #define SG_VERSION_STR "3.5.33"
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/config.h>
32 #include <linux/module.h>
33
34 #include <linux/fs.h>
35 #include <linux/kernel.h>
36 #include <linux/sched.h>
37 #include <linux/string.h>
38 #include <linux/mm.h>
39 #include <linux/errno.h>
40 #include <linux/mtio.h>
41 #include <linux/ioctl.h>
42 #include <linux/fcntl.h>
43 #include <linux/init.h>
44 #include <linux/poll.h>
45 #include <linux/smp_lock.h>
46 #include <linux/moduleparam.h>
47 #include <linux/devfs_fs_kernel.h>
48 #include <linux/cdev.h>
49 #include <linux/seq_file.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.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 = "20050908";
65
66 static int sg_proc_init(void);
67 static void sg_proc_cleanup(void);
68 #endif
69
70 #ifndef LINUX_VERSION_CODE
71 #include <linux/version.h>
72 #endif /* LINUX_VERSION_CODE */
73
74 #define SG_ALLOW_DIO_DEF 0
75 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
76
77 #define SG_MAX_DEVS 32768
78
79 /*
80 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
81 * Then when using 32 bit integers x * m may overflow during the calculation.
82 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
83 * calculates the same, but prevents the overflow when both m and d
84 * are "small" numbers (like HZ and USER_HZ).
85 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
86 * in 32 bits.
87 */
88 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
89
90 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
91
92 int sg_big_buff = SG_DEF_RESERVED_SIZE;
93 /* N.B. This variable is readable and writeable via
94 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
95 of this size (or less if there is not enough memory) will be reserved
96 for use by this file descriptor. [Deprecated usage: this variable is also
97 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
98 the kernel (i.e. it is not a module).] */
99 static int def_reserved_size = -1; /* picks up init parameter */
100 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
101
102 #define SG_SECTOR_SZ 512
103 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
104
105 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
106
107 static int sg_add(struct class_device *);
108 static void sg_remove(struct class_device *);
109
110 static Scsi_Request *dummy_cmdp; /* only used for sizeof */
111
112 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock
113 file descriptor list for device */
114
115 static struct class_interface sg_interface = {
116 .add = sg_add,
117 .remove = sg_remove,
118 };
119
120 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
121 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
122 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
123 unsigned bufflen; /* Size of (aggregate) data buffer */
124 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
125 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
126 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
127 unsigned char cmd_opcode; /* first byte of command */
128 } Sg_scatter_hold;
129
130 struct sg_device; /* forward declarations */
131 struct sg_fd;
132
133 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
134 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
135 struct sg_request *nextrp; /* NULL -> tail request (slist) */
136 struct sg_fd *parentfp; /* NULL -> not in use */
137 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
138 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
139 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
140 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
141 char orphan; /* 1 -> drop on sight, 0 -> normal */
142 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
143 volatile char done; /* 0->before bh, 1->before read, 2->read */
144 } Sg_request;
145
146 typedef struct sg_fd { /* holds the state of a file descriptor */
147 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
148 struct sg_device *parentdp; /* owning device */
149 wait_queue_head_t read_wait; /* queue read until command done */
150 rwlock_t rq_list_lock; /* protect access to list in req_arr */
151 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
152 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
153 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
154 unsigned save_scat_len; /* original length of trunc. scat. element */
155 Sg_request *headrp; /* head of request slist, NULL->empty */
156 struct fasync_struct *async_qp; /* used by asynchronous notification */
157 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
158 char low_dma; /* as in parent but possibly overridden to 1 */
159 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
160 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
161 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
162 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
163 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
164 char mmap_called; /* 0 -> mmap() never called on this fd */
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 Sg_fd *headfp; /* first open fd belonging to this device */
172 volatile char detached; /* 0->attached, 1->detached pending removal */
173 volatile char exclude; /* opened for exclusive access */
174 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
175 struct gendisk *disk;
176 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
177 } Sg_device;
178
179 static int sg_fasync(int fd, struct file *filp, int mode);
180 static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */
181 static int sg_start_req(Sg_request * srp);
182 static void sg_finish_rem_req(Sg_request * srp);
183 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
184 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
185 int tablesize);
186 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
187 Sg_request * srp);
188 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
189 int blocking, int read_only, Sg_request ** o_srp);
190 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
191 unsigned char *cmnd, int timeout, int blocking);
192 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
193 int wr_xf, int *countp, unsigned char __user **up);
194 static int sg_write_xfer(Sg_request * srp);
195 static int sg_read_xfer(Sg_request * srp);
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 char *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
202 static void sg_page_free(char *buff, int size);
203 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
204 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
205 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
206 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
207 static Sg_request *sg_add_request(Sg_fd * sfp);
208 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
209 static int sg_res_in_use(Sg_fd * sfp);
210 static int sg_allow_access(unsigned char opcode, char dev_type);
211 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
212 static Sg_device *sg_get_dev(int dev);
213 static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp);
214 #ifdef CONFIG_SCSI_PROC_FS
215 static int sg_last_dev(void);
216 #endif
217
218 static Sg_device **sg_dev_arr = NULL;
219 static int sg_dev_max;
220 static int sg_nr_dev;
221
222 #define SZ_SG_HEADER sizeof(struct sg_header)
223 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
224 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
225 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
226
227 static int
228 sg_open(struct inode *inode, struct file *filp)
229 {
230 int dev = iminor(inode);
231 int flags = filp->f_flags;
232 Sg_device *sdp;
233 Sg_fd *sfp;
234 int res;
235 int retval;
236
237 nonseekable_open(inode, filp);
238 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
239 sdp = sg_get_dev(dev);
240 if ((!sdp) || (!sdp->device))
241 return -ENXIO;
242 if (sdp->detached)
243 return -ENODEV;
244
245 /* This driver's module count bumped by fops_get in <linux/fs.h> */
246 /* Prevent the device driver from vanishing while we sleep */
247 retval = scsi_device_get(sdp->device);
248 if (retval)
249 return retval;
250
251 if (!((flags & O_NONBLOCK) ||
252 scsi_block_when_processing_errors(sdp->device))) {
253 retval = -ENXIO;
254 /* we are in error recovery for this device */
255 goto error_out;
256 }
257
258 if (flags & O_EXCL) {
259 if (O_RDONLY == (flags & O_ACCMODE)) {
260 retval = -EPERM; /* Can't lock it with read only access */
261 goto error_out;
262 }
263 if (sdp->headfp && (flags & O_NONBLOCK)) {
264 retval = -EBUSY;
265 goto error_out;
266 }
267 res = 0;
268 __wait_event_interruptible(sdp->o_excl_wait,
269 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
270 if (res) {
271 retval = res; /* -ERESTARTSYS because signal hit process */
272 goto error_out;
273 }
274 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
275 if (flags & O_NONBLOCK) {
276 retval = -EBUSY;
277 goto error_out;
278 }
279 res = 0;
280 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
281 res);
282 if (res) {
283 retval = res; /* -ERESTARTSYS because signal hit process */
284 goto error_out;
285 }
286 }
287 if (sdp->detached) {
288 retval = -ENODEV;
289 goto error_out;
290 }
291 if (!sdp->headfp) { /* no existing opens on this device */
292 sdp->sgdebug = 0;
293 sdp->sg_tablesize = sdp->device->host->sg_tablesize;
294 }
295 if ((sfp = sg_add_sfp(sdp, dev)))
296 filp->private_data = sfp;
297 else {
298 if (flags & O_EXCL)
299 sdp->exclude = 0; /* undo if error */
300 retval = -ENOMEM;
301 goto error_out;
302 }
303 return 0;
304
305 error_out:
306 scsi_device_put(sdp->device);
307 return retval;
308 }
309
310 /* Following function was formerly called 'sg_close' */
311 static int
312 sg_release(struct inode *inode, struct file *filp)
313 {
314 Sg_device *sdp;
315 Sg_fd *sfp;
316
317 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
318 return -ENXIO;
319 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
320 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
321 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
322 if (!sdp->detached) {
323 scsi_device_put(sdp->device);
324 }
325 sdp->exclude = 0;
326 wake_up_interruptible(&sdp->o_excl_wait);
327 }
328 return 0;
329 }
330
331 static ssize_t
332 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
333 {
334 Sg_device *sdp;
335 Sg_fd *sfp;
336 Sg_request *srp;
337 int req_pack_id = -1;
338 sg_io_hdr_t *hp;
339 struct sg_header *old_hdr = NULL;
340 int retval = 0;
341
342 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
343 return -ENXIO;
344 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
345 sdp->disk->disk_name, (int) count));
346 if (!access_ok(VERIFY_WRITE, buf, count))
347 return -EFAULT;
348 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
349 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
350 if (!old_hdr)
351 return -ENOMEM;
352 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
353 retval = -EFAULT;
354 goto free_old_hdr;
355 }
356 if (old_hdr->reply_len < 0) {
357 if (count >= SZ_SG_IO_HDR) {
358 sg_io_hdr_t *new_hdr;
359 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
360 if (!new_hdr) {
361 retval = -ENOMEM;
362 goto free_old_hdr;
363 }
364 retval =__copy_from_user
365 (new_hdr, buf, SZ_SG_IO_HDR);
366 req_pack_id = new_hdr->pack_id;
367 kfree(new_hdr);
368 if (retval) {
369 retval = -EFAULT;
370 goto free_old_hdr;
371 }
372 }
373 } else
374 req_pack_id = old_hdr->pack_id;
375 }
376 srp = sg_get_rq_mark(sfp, req_pack_id);
377 if (!srp) { /* now wait on packet to arrive */
378 if (sdp->detached) {
379 retval = -ENODEV;
380 goto free_old_hdr;
381 }
382 if (filp->f_flags & O_NONBLOCK) {
383 retval = -EAGAIN;
384 goto free_old_hdr;
385 }
386 while (1) {
387 retval = 0; /* following macro beats race condition */
388 __wait_event_interruptible(sfp->read_wait,
389 (sdp->detached ||
390 (srp = sg_get_rq_mark(sfp, req_pack_id))),
391 retval);
392 if (sdp->detached) {
393 retval = -ENODEV;
394 goto free_old_hdr;
395 }
396 if (0 == retval)
397 break;
398
399 /* -ERESTARTSYS as signal hit process */
400 goto free_old_hdr;
401 }
402 }
403 if (srp->header.interface_id != '\0') {
404 retval = sg_new_read(sfp, buf, count, srp);
405 goto free_old_hdr;
406 }
407
408 hp = &srp->header;
409 if (old_hdr == NULL) {
410 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
411 if (! old_hdr) {
412 retval = -ENOMEM;
413 goto free_old_hdr;
414 }
415 }
416 memset(old_hdr, 0, SZ_SG_HEADER);
417 old_hdr->reply_len = (int) hp->timeout;
418 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
419 old_hdr->pack_id = hp->pack_id;
420 old_hdr->twelve_byte =
421 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
422 old_hdr->target_status = hp->masked_status;
423 old_hdr->host_status = hp->host_status;
424 old_hdr->driver_status = hp->driver_status;
425 if ((CHECK_CONDITION & hp->masked_status) ||
426 (DRIVER_SENSE & hp->driver_status))
427 memcpy(old_hdr->sense_buffer, srp->sense_b,
428 sizeof (old_hdr->sense_buffer));
429 switch (hp->host_status) {
430 /* This setup of 'result' is for backward compatibility and is best
431 ignored by the user who should use target, host + driver status */
432 case DID_OK:
433 case DID_PASSTHROUGH:
434 case DID_SOFT_ERROR:
435 old_hdr->result = 0;
436 break;
437 case DID_NO_CONNECT:
438 case DID_BUS_BUSY:
439 case DID_TIME_OUT:
440 old_hdr->result = EBUSY;
441 break;
442 case DID_BAD_TARGET:
443 case DID_ABORT:
444 case DID_PARITY:
445 case DID_RESET:
446 case DID_BAD_INTR:
447 old_hdr->result = EIO;
448 break;
449 case DID_ERROR:
450 old_hdr->result = (srp->sense_b[0] == 0 &&
451 hp->masked_status == GOOD) ? 0 : EIO;
452 break;
453 default:
454 old_hdr->result = EIO;
455 break;
456 }
457
458 /* Now copy the result back to the user buffer. */
459 if (count >= SZ_SG_HEADER) {
460 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
461 retval = -EFAULT;
462 goto free_old_hdr;
463 }
464 buf += SZ_SG_HEADER;
465 if (count > old_hdr->reply_len)
466 count = old_hdr->reply_len;
467 if (count > SZ_SG_HEADER) {
468 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
469 retval = -EFAULT;
470 goto free_old_hdr;
471 }
472 }
473 } else
474 count = (old_hdr->result == 0) ? 0 : -EIO;
475 sg_finish_rem_req(srp);
476 retval = count;
477 free_old_hdr:
478 if (old_hdr)
479 kfree(old_hdr);
480 return retval;
481 }
482
483 static ssize_t
484 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
485 {
486 sg_io_hdr_t *hp = &srp->header;
487 int err = 0;
488 int len;
489
490 if (count < SZ_SG_IO_HDR) {
491 err = -EINVAL;
492 goto err_out;
493 }
494 hp->sb_len_wr = 0;
495 if ((hp->mx_sb_len > 0) && hp->sbp) {
496 if ((CHECK_CONDITION & hp->masked_status) ||
497 (DRIVER_SENSE & hp->driver_status)) {
498 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer);
499 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
500 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
501 len = (len > sb_len) ? sb_len : len;
502 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
503 err = -EFAULT;
504 goto err_out;
505 }
506 hp->sb_len_wr = len;
507 }
508 }
509 if (hp->masked_status || hp->host_status || hp->driver_status)
510 hp->info |= SG_INFO_CHECK;
511 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
512 err = -EFAULT;
513 goto err_out;
514 }
515 err = sg_read_xfer(srp);
516 err_out:
517 sg_finish_rem_req(srp);
518 return (0 == err) ? count : err;
519 }
520
521 static ssize_t
522 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
523 {
524 int mxsize, cmd_size, k;
525 int input_size, blocking;
526 unsigned char opcode;
527 Sg_device *sdp;
528 Sg_fd *sfp;
529 Sg_request *srp;
530 struct sg_header old_hdr;
531 sg_io_hdr_t *hp;
532 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
533
534 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
535 return -ENXIO;
536 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
537 sdp->disk->disk_name, (int) count));
538 if (sdp->detached)
539 return -ENODEV;
540 if (!((filp->f_flags & O_NONBLOCK) ||
541 scsi_block_when_processing_errors(sdp->device)))
542 return -ENXIO;
543
544 if (!access_ok(VERIFY_READ, buf, count))
545 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
546 if (count < SZ_SG_HEADER)
547 return -EIO;
548 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
549 return -EFAULT;
550 blocking = !(filp->f_flags & O_NONBLOCK);
551 if (old_hdr.reply_len < 0)
552 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
553 if (count < (SZ_SG_HEADER + 6))
554 return -EIO; /* The minimum scsi command length is 6 bytes. */
555
556 if (!(srp = sg_add_request(sfp))) {
557 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
558 return -EDOM;
559 }
560 buf += SZ_SG_HEADER;
561 __get_user(opcode, buf);
562 if (sfp->next_cmd_len > 0) {
563 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
564 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
565 sfp->next_cmd_len = 0;
566 sg_remove_request(sfp, srp);
567 return -EIO;
568 }
569 cmd_size = sfp->next_cmd_len;
570 sfp->next_cmd_len = 0; /* reset so only this write() effected */
571 } else {
572 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
573 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
574 cmd_size = 12;
575 }
576 SCSI_LOG_TIMEOUT(4, printk(
577 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
578 /* Determine buffer size. */
579 input_size = count - cmd_size;
580 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
581 mxsize -= SZ_SG_HEADER;
582 input_size -= SZ_SG_HEADER;
583 if (input_size < 0) {
584 sg_remove_request(sfp, srp);
585 return -EIO; /* User did not pass enough bytes for this command. */
586 }
587 hp = &srp->header;
588 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
589 hp->cmd_len = (unsigned char) cmd_size;
590 hp->iovec_count = 0;
591 hp->mx_sb_len = 0;
592 if (input_size > 0)
593 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
594 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
595 else
596 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
597 hp->dxfer_len = mxsize;
598 hp->dxferp = (char __user *)buf + cmd_size;
599 hp->sbp = NULL;
600 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
601 hp->flags = input_size; /* structure abuse ... */
602 hp->pack_id = old_hdr.pack_id;
603 hp->usr_ptr = NULL;
604 if (__copy_from_user(cmnd, buf, cmd_size))
605 return -EFAULT;
606 /*
607 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
608 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
609 * is a non-zero input_size, so emit a warning.
610 */
611 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)
612 if (printk_ratelimit())
613 printk(KERN_WARNING
614 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
615 "guessing data in;\n" KERN_WARNING " "
616 "program %s not setting count and/or reply_len properly\n",
617 old_hdr.reply_len - (int)SZ_SG_HEADER,
618 input_size, (unsigned int) cmnd[0],
619 current->comm);
620 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
621 return (k < 0) ? k : count;
622 }
623
624 static ssize_t
625 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
626 int blocking, int read_only, Sg_request ** o_srp)
627 {
628 int k;
629 Sg_request *srp;
630 sg_io_hdr_t *hp;
631 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
632 int timeout;
633 unsigned long ul_timeout;
634
635 if (count < SZ_SG_IO_HDR)
636 return -EINVAL;
637 if (!access_ok(VERIFY_READ, buf, count))
638 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
639
640 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
641 if (!(srp = sg_add_request(sfp))) {
642 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
643 return -EDOM;
644 }
645 hp = &srp->header;
646 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
647 sg_remove_request(sfp, srp);
648 return -EFAULT;
649 }
650 if (hp->interface_id != 'S') {
651 sg_remove_request(sfp, srp);
652 return -ENOSYS;
653 }
654 if (hp->flags & SG_FLAG_MMAP_IO) {
655 if (hp->dxfer_len > sfp->reserve.bufflen) {
656 sg_remove_request(sfp, srp);
657 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
658 }
659 if (hp->flags & SG_FLAG_DIRECT_IO) {
660 sg_remove_request(sfp, srp);
661 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
662 }
663 if (sg_res_in_use(sfp)) {
664 sg_remove_request(sfp, srp);
665 return -EBUSY; /* reserve buffer already being used */
666 }
667 }
668 ul_timeout = msecs_to_jiffies(srp->header.timeout);
669 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
670 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
671 sg_remove_request(sfp, srp);
672 return -EMSGSIZE;
673 }
674 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
675 sg_remove_request(sfp, srp);
676 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
677 }
678 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
679 sg_remove_request(sfp, srp);
680 return -EFAULT;
681 }
682 if (read_only &&
683 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
684 sg_remove_request(sfp, srp);
685 return -EPERM;
686 }
687 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
688 if (k < 0)
689 return k;
690 if (o_srp)
691 *o_srp = srp;
692 return count;
693 }
694
695 static int
696 sg_common_write(Sg_fd * sfp, Sg_request * srp,
697 unsigned char *cmnd, int timeout, int blocking)
698 {
699 int k;
700 Scsi_Request *SRpnt;
701 Sg_device *sdp = sfp->parentdp;
702 sg_io_hdr_t *hp = &srp->header;
703 request_queue_t *q;
704
705 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
706 hp->status = 0;
707 hp->masked_status = 0;
708 hp->msg_status = 0;
709 hp->info = 0;
710 hp->host_status = 0;
711 hp->driver_status = 0;
712 hp->resid = 0;
713 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
714 (int) cmnd[0], (int) hp->cmd_len));
715
716 if ((k = sg_start_req(srp))) {
717 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
718 sg_finish_rem_req(srp);
719 return k; /* probably out of space --> ENOMEM */
720 }
721 if ((k = sg_write_xfer(srp))) {
722 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
723 sg_finish_rem_req(srp);
724 return k;
725 }
726 if (sdp->detached) {
727 sg_finish_rem_req(srp);
728 return -ENODEV;
729 }
730 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC);
731 if (SRpnt == NULL) {
732 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
733 sg_finish_rem_req(srp);
734 return -ENOMEM;
735 }
736
737 srp->my_cmdp = SRpnt;
738 q = SRpnt->sr_device->request_queue;
739 SRpnt->sr_request->rq_disk = sdp->disk;
740 SRpnt->sr_sense_buffer[0] = 0;
741 SRpnt->sr_cmd_len = hp->cmd_len;
742 SRpnt->sr_use_sg = srp->data.k_use_sg;
743 SRpnt->sr_sglist_len = srp->data.sglist_len;
744 SRpnt->sr_bufflen = srp->data.bufflen;
745 SRpnt->sr_underflow = 0;
746 SRpnt->sr_buffer = srp->data.buffer;
747 switch (hp->dxfer_direction) {
748 case SG_DXFER_TO_FROM_DEV:
749 case SG_DXFER_FROM_DEV:
750 SRpnt->sr_data_direction = DMA_FROM_DEVICE;
751 break;
752 case SG_DXFER_TO_DEV:
753 SRpnt->sr_data_direction = DMA_TO_DEVICE;
754 break;
755 case SG_DXFER_UNKNOWN:
756 SRpnt->sr_data_direction = DMA_BIDIRECTIONAL;
757 break;
758 default:
759 SRpnt->sr_data_direction = DMA_NONE;
760 break;
761 }
762 SRpnt->upper_private_data = srp;
763 srp->data.k_use_sg = 0;
764 srp->data.sglist_len = 0;
765 srp->data.bufflen = 0;
766 srp->data.buffer = NULL;
767 hp->duration = jiffies_to_msecs(jiffies);
768 /* Now send everything of to mid-level. The next time we hear about this
769 packet is when sg_cmd_done() is called (i.e. a callback). */
770 scsi_do_req(SRpnt, (void *) cmnd,
771 (void *) SRpnt->sr_buffer, hp->dxfer_len,
772 sg_cmd_done, timeout, SG_DEFAULT_RETRIES);
773 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
774 return 0;
775 }
776
777 static int
778 sg_srp_done(Sg_request *srp, Sg_fd *sfp)
779 {
780 unsigned long iflags;
781 int done;
782
783 read_lock_irqsave(&sfp->rq_list_lock, iflags);
784 done = srp->done;
785 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
786 return done;
787 }
788
789 static int
790 sg_ioctl(struct inode *inode, struct file *filp,
791 unsigned int cmd_in, unsigned long arg)
792 {
793 void __user *p = (void __user *)arg;
794 int __user *ip = p;
795 int result, val, read_only;
796 Sg_device *sdp;
797 Sg_fd *sfp;
798 Sg_request *srp;
799 unsigned long iflags;
800
801 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
802 return -ENXIO;
803 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
804 sdp->disk->disk_name, (int) cmd_in));
805 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
806
807 switch (cmd_in) {
808 case SG_IO:
809 {
810 int blocking = 1; /* ignore O_NONBLOCK flag */
811
812 if (sdp->detached)
813 return -ENODEV;
814 if (!scsi_block_when_processing_errors(sdp->device))
815 return -ENXIO;
816 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
817 return -EFAULT;
818 result =
819 sg_new_write(sfp, p, SZ_SG_IO_HDR,
820 blocking, read_only, &srp);
821 if (result < 0)
822 return result;
823 srp->sg_io_owned = 1;
824 while (1) {
825 result = 0; /* following macro to beat race condition */
826 __wait_event_interruptible(sfp->read_wait,
827 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
828 result);
829 if (sdp->detached)
830 return -ENODEV;
831 if (sfp->closed)
832 return 0; /* request packet dropped already */
833 if (0 == result)
834 break;
835 srp->orphan = 1;
836 return result; /* -ERESTARTSYS because signal hit process */
837 }
838 write_lock_irqsave(&sfp->rq_list_lock, iflags);
839 srp->done = 2;
840 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
841 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
842 return (result < 0) ? result : 0;
843 }
844 case SG_SET_TIMEOUT:
845 result = get_user(val, ip);
846 if (result)
847 return result;
848 if (val < 0)
849 return -EIO;
850 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
851 val = MULDIV (INT_MAX, USER_HZ, HZ);
852 sfp->timeout_user = val;
853 sfp->timeout = MULDIV (val, HZ, USER_HZ);
854
855 return 0;
856 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
857 /* strange ..., for backward compatibility */
858 return sfp->timeout_user;
859 case SG_SET_FORCE_LOW_DMA:
860 result = get_user(val, ip);
861 if (result)
862 return result;
863 if (val) {
864 sfp->low_dma = 1;
865 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
866 val = (int) sfp->reserve.bufflen;
867 sg_remove_scat(&sfp->reserve);
868 sg_build_reserve(sfp, val);
869 }
870 } else {
871 if (sdp->detached)
872 return -ENODEV;
873 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
874 }
875 return 0;
876 case SG_GET_LOW_DMA:
877 return put_user((int) sfp->low_dma, ip);
878 case SG_GET_SCSI_ID:
879 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
880 return -EFAULT;
881 else {
882 sg_scsi_id_t __user *sg_idp = p;
883
884 if (sdp->detached)
885 return -ENODEV;
886 __put_user((int) sdp->device->host->host_no,
887 &sg_idp->host_no);
888 __put_user((int) sdp->device->channel,
889 &sg_idp->channel);
890 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
891 __put_user((int) sdp->device->lun, &sg_idp->lun);
892 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
893 __put_user((short) sdp->device->host->cmd_per_lun,
894 &sg_idp->h_cmd_per_lun);
895 __put_user((short) sdp->device->queue_depth,
896 &sg_idp->d_queue_depth);
897 __put_user(0, &sg_idp->unused[0]);
898 __put_user(0, &sg_idp->unused[1]);
899 return 0;
900 }
901 case SG_SET_FORCE_PACK_ID:
902 result = get_user(val, ip);
903 if (result)
904 return result;
905 sfp->force_packid = val ? 1 : 0;
906 return 0;
907 case SG_GET_PACK_ID:
908 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
909 return -EFAULT;
910 read_lock_irqsave(&sfp->rq_list_lock, iflags);
911 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
912 if ((1 == srp->done) && (!srp->sg_io_owned)) {
913 read_unlock_irqrestore(&sfp->rq_list_lock,
914 iflags);
915 __put_user(srp->header.pack_id, ip);
916 return 0;
917 }
918 }
919 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
920 __put_user(-1, ip);
921 return 0;
922 case SG_GET_NUM_WAITING:
923 read_lock_irqsave(&sfp->rq_list_lock, iflags);
924 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
925 if ((1 == srp->done) && (!srp->sg_io_owned))
926 ++val;
927 }
928 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
929 return put_user(val, ip);
930 case SG_GET_SG_TABLESIZE:
931 return put_user(sdp->sg_tablesize, ip);
932 case SG_SET_RESERVED_SIZE:
933 result = get_user(val, ip);
934 if (result)
935 return result;
936 if (val < 0)
937 return -EINVAL;
938 if (val != sfp->reserve.bufflen) {
939 if (sg_res_in_use(sfp) || sfp->mmap_called)
940 return -EBUSY;
941 sg_remove_scat(&sfp->reserve);
942 sg_build_reserve(sfp, val);
943 }
944 return 0;
945 case SG_GET_RESERVED_SIZE:
946 val = (int) sfp->reserve.bufflen;
947 return put_user(val, ip);
948 case SG_SET_COMMAND_Q:
949 result = get_user(val, ip);
950 if (result)
951 return result;
952 sfp->cmd_q = val ? 1 : 0;
953 return 0;
954 case SG_GET_COMMAND_Q:
955 return put_user((int) sfp->cmd_q, ip);
956 case SG_SET_KEEP_ORPHAN:
957 result = get_user(val, ip);
958 if (result)
959 return result;
960 sfp->keep_orphan = val;
961 return 0;
962 case SG_GET_KEEP_ORPHAN:
963 return put_user((int) sfp->keep_orphan, ip);
964 case SG_NEXT_CMD_LEN:
965 result = get_user(val, ip);
966 if (result)
967 return result;
968 sfp->next_cmd_len = (val > 0) ? val : 0;
969 return 0;
970 case SG_GET_VERSION_NUM:
971 return put_user(sg_version_num, ip);
972 case SG_GET_ACCESS_COUNT:
973 /* faked - we don't have a real access count anymore */
974 val = (sdp->device ? 1 : 0);
975 return put_user(val, ip);
976 case SG_GET_REQUEST_TABLE:
977 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
978 return -EFAULT;
979 else {
980 sg_req_info_t *rinfo;
981 unsigned int ms;
982
983 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
984 GFP_KERNEL);
985 if (!rinfo)
986 return -ENOMEM;
987 read_lock_irqsave(&sfp->rq_list_lock, iflags);
988 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
989 ++val, srp = srp ? srp->nextrp : srp) {
990 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
991 if (srp) {
992 rinfo[val].req_state = srp->done + 1;
993 rinfo[val].problem =
994 srp->header.masked_status &
995 srp->header.host_status &
996 srp->header.driver_status;
997 if (srp->done)
998 rinfo[val].duration =
999 srp->header.duration;
1000 else {
1001 ms = jiffies_to_msecs(jiffies);
1002 rinfo[val].duration =
1003 (ms > srp->header.duration) ?
1004 (ms - srp->header.duration) : 0;
1005 }
1006 rinfo[val].orphan = srp->orphan;
1007 rinfo[val].sg_io_owned =
1008 srp->sg_io_owned;
1009 rinfo[val].pack_id =
1010 srp->header.pack_id;
1011 rinfo[val].usr_ptr =
1012 srp->header.usr_ptr;
1013 }
1014 }
1015 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1016 result = __copy_to_user(p, rinfo,
1017 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1018 result = result ? -EFAULT : 0;
1019 kfree(rinfo);
1020 return result;
1021 }
1022 case SG_EMULATED_HOST:
1023 if (sdp->detached)
1024 return -ENODEV;
1025 return put_user(sdp->device->host->hostt->emulated, ip);
1026 case SG_SCSI_RESET:
1027 if (sdp->detached)
1028 return -ENODEV;
1029 if (filp->f_flags & O_NONBLOCK) {
1030 if (scsi_host_in_recovery(sdp->device->host))
1031 return -EBUSY;
1032 } else if (!scsi_block_when_processing_errors(sdp->device))
1033 return -EBUSY;
1034 result = get_user(val, ip);
1035 if (result)
1036 return result;
1037 if (SG_SCSI_RESET_NOTHING == val)
1038 return 0;
1039 switch (val) {
1040 case SG_SCSI_RESET_DEVICE:
1041 val = SCSI_TRY_RESET_DEVICE;
1042 break;
1043 case SG_SCSI_RESET_BUS:
1044 val = SCSI_TRY_RESET_BUS;
1045 break;
1046 case SG_SCSI_RESET_HOST:
1047 val = SCSI_TRY_RESET_HOST;
1048 break;
1049 default:
1050 return -EINVAL;
1051 }
1052 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1053 return -EACCES;
1054 return (scsi_reset_provider(sdp->device, val) ==
1055 SUCCESS) ? 0 : -EIO;
1056 case SCSI_IOCTL_SEND_COMMAND:
1057 if (sdp->detached)
1058 return -ENODEV;
1059 if (read_only) {
1060 unsigned char opcode = WRITE_6;
1061 Scsi_Ioctl_Command __user *siocp = p;
1062
1063 if (copy_from_user(&opcode, siocp->data, 1))
1064 return -EFAULT;
1065 if (!sg_allow_access(opcode, sdp->device->type))
1066 return -EPERM;
1067 }
1068 return scsi_ioctl_send_command(sdp->device, p);
1069 case SG_SET_DEBUG:
1070 result = get_user(val, ip);
1071 if (result)
1072 return result;
1073 sdp->sgdebug = (char) val;
1074 return 0;
1075 case SCSI_IOCTL_GET_IDLUN:
1076 case SCSI_IOCTL_GET_BUS_NUMBER:
1077 case SCSI_IOCTL_PROBE_HOST:
1078 case SG_GET_TRANSFORM:
1079 if (sdp->detached)
1080 return -ENODEV;
1081 return scsi_ioctl(sdp->device, cmd_in, p);
1082 default:
1083 if (read_only)
1084 return -EPERM; /* don't know so take safe approach */
1085 return scsi_ioctl(sdp->device, cmd_in, p);
1086 }
1087 }
1088
1089 #ifdef CONFIG_COMPAT
1090 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1091 {
1092 Sg_device *sdp;
1093 Sg_fd *sfp;
1094 struct scsi_device *sdev;
1095
1096 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1097 return -ENXIO;
1098
1099 sdev = sdp->device;
1100 if (sdev->host->hostt->compat_ioctl) {
1101 int ret;
1102
1103 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1104
1105 return ret;
1106 }
1107
1108 return -ENOIOCTLCMD;
1109 }
1110 #endif
1111
1112 static unsigned int
1113 sg_poll(struct file *filp, poll_table * wait)
1114 {
1115 unsigned int res = 0;
1116 Sg_device *sdp;
1117 Sg_fd *sfp;
1118 Sg_request *srp;
1119 int count = 0;
1120 unsigned long iflags;
1121
1122 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1123 || sfp->closed)
1124 return POLLERR;
1125 poll_wait(filp, &sfp->read_wait, wait);
1126 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1127 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1128 /* if any read waiting, flag it */
1129 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1130 res = POLLIN | POLLRDNORM;
1131 ++count;
1132 }
1133 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1134
1135 if (sdp->detached)
1136 res |= POLLHUP;
1137 else if (!sfp->cmd_q) {
1138 if (0 == count)
1139 res |= POLLOUT | POLLWRNORM;
1140 } else if (count < SG_MAX_QUEUE)
1141 res |= POLLOUT | POLLWRNORM;
1142 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1143 sdp->disk->disk_name, (int) res));
1144 return res;
1145 }
1146
1147 static int
1148 sg_fasync(int fd, struct file *filp, int mode)
1149 {
1150 int retval;
1151 Sg_device *sdp;
1152 Sg_fd *sfp;
1153
1154 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1155 return -ENXIO;
1156 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1157 sdp->disk->disk_name, mode));
1158
1159 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1160 return (retval < 0) ? retval : 0;
1161 }
1162
1163 static inline unsigned char *
1164 sg_scatg2virt(const struct scatterlist *sclp)
1165 {
1166 return (sclp && sclp->page) ?
1167 (unsigned char *) page_address(sclp->page) + sclp->offset : NULL;
1168 }
1169
1170 /* When startFinish==1 increments page counts for pages other than the
1171 first of scatter gather elements obtained from __get_free_pages().
1172 When startFinish==0 decrements ... */
1173 static void
1174 sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
1175 {
1176 void *page_ptr;
1177 struct page *page;
1178 int k, m;
1179
1180 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1181 startFinish, rsv_schp->k_use_sg));
1182 /* N.B. correction _not_ applied to base page of each allocation */
1183 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1184 struct scatterlist *sclp = rsv_schp->buffer;
1185
1186 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
1187 for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
1188 page_ptr = sg_scatg2virt(sclp) + m;
1189 page = virt_to_page(page_ptr);
1190 if (startFinish)
1191 get_page(page);
1192 else {
1193 if (page_count(page) > 0)
1194 __put_page(page);
1195 }
1196 }
1197 }
1198 } else { /* reserve buffer is just a single allocation */
1199 for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
1200 page_ptr = (unsigned char *) rsv_schp->buffer + m;
1201 page = virt_to_page(page_ptr);
1202 if (startFinish)
1203 get_page(page);
1204 else {
1205 if (page_count(page) > 0)
1206 __put_page(page);
1207 }
1208 }
1209 }
1210 }
1211
1212 static struct page *
1213 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1214 {
1215 Sg_fd *sfp;
1216 struct page *page = NOPAGE_SIGBUS;
1217 void *page_ptr = NULL;
1218 unsigned long offset;
1219 Sg_scatter_hold *rsv_schp;
1220
1221 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1222 return page;
1223 rsv_schp = &sfp->reserve;
1224 offset = addr - vma->vm_start;
1225 if (offset >= rsv_schp->bufflen)
1226 return page;
1227 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1228 offset, rsv_schp->k_use_sg));
1229 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1230 int k;
1231 unsigned long sa = vma->vm_start;
1232 unsigned long len;
1233 struct scatterlist *sclp = rsv_schp->buffer;
1234
1235 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1236 ++k, ++sclp) {
1237 len = vma->vm_end - sa;
1238 len = (len < sclp->length) ? len : sclp->length;
1239 if (offset < len) {
1240 page_ptr = sg_scatg2virt(sclp) + offset;
1241 page = virt_to_page(page_ptr);
1242 get_page(page); /* increment page count */
1243 break;
1244 }
1245 sa += len;
1246 offset -= len;
1247 }
1248 } else { /* reserve buffer is just a single allocation */
1249 page_ptr = (unsigned char *) rsv_schp->buffer + offset;
1250 page = virt_to_page(page_ptr);
1251 get_page(page); /* increment page count */
1252 }
1253 if (type)
1254 *type = VM_FAULT_MINOR;
1255 return page;
1256 }
1257
1258 static struct vm_operations_struct sg_mmap_vm_ops = {
1259 .nopage = sg_vma_nopage,
1260 };
1261
1262 static int
1263 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1264 {
1265 Sg_fd *sfp;
1266 unsigned long req_sz;
1267 Sg_scatter_hold *rsv_schp;
1268
1269 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1270 return -ENXIO;
1271 req_sz = vma->vm_end - vma->vm_start;
1272 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1273 (void *) vma->vm_start, (int) req_sz));
1274 if (vma->vm_pgoff)
1275 return -EINVAL; /* want no offset */
1276 rsv_schp = &sfp->reserve;
1277 if (req_sz > rsv_schp->bufflen)
1278 return -ENOMEM; /* cannot map more than reserved buffer */
1279
1280 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1281 int k;
1282 unsigned long sa = vma->vm_start;
1283 unsigned long len;
1284 struct scatterlist *sclp = rsv_schp->buffer;
1285
1286 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1287 ++k, ++sclp) {
1288 if (0 != sclp->offset)
1289 return -EFAULT; /* non page aligned memory ?? */
1290 len = vma->vm_end - sa;
1291 len = (len < sclp->length) ? len : sclp->length;
1292 sa += len;
1293 }
1294 } else { /* reserve buffer is just a single allocation */
1295 if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1))
1296 return -EFAULT; /* non page aligned memory ?? */
1297 }
1298 if (0 == sfp->mmap_called) {
1299 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
1300 sfp->mmap_called = 1;
1301 }
1302 vma->vm_flags |= VM_RESERVED;
1303 vma->vm_private_data = sfp;
1304 vma->vm_ops = &sg_mmap_vm_ops;
1305 return 0;
1306 }
1307
1308 /* This function is a "bottom half" handler that is called by the
1309 * mid level when a command is completed (or has failed). */
1310 static void
1311 sg_cmd_done(Scsi_Cmnd * SCpnt)
1312 {
1313 Scsi_Request *SRpnt = NULL;
1314 Sg_device *sdp = NULL;
1315 Sg_fd *sfp;
1316 Sg_request *srp = NULL;
1317 unsigned long iflags;
1318 unsigned int ms;
1319
1320 if (SCpnt && (SRpnt = SCpnt->sc_request))
1321 srp = (Sg_request *) SRpnt->upper_private_data;
1322 if (NULL == srp) {
1323 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1324 if (SRpnt)
1325 scsi_release_request(SRpnt);
1326 return;
1327 }
1328 sfp = srp->parentfp;
1329 if (sfp)
1330 sdp = sfp->parentdp;
1331 if ((NULL == sdp) || sdp->detached) {
1332 printk(KERN_INFO "sg_cmd_done: device detached\n");
1333 scsi_release_request(SRpnt);
1334 return;
1335 }
1336
1337 /* First transfer ownership of data buffers to sg_device object. */
1338 srp->data.k_use_sg = SRpnt->sr_use_sg;
1339 srp->data.sglist_len = SRpnt->sr_sglist_len;
1340 srp->data.bufflen = SRpnt->sr_bufflen;
1341 srp->data.buffer = SRpnt->sr_buffer;
1342 /* now clear out request structure */
1343 SRpnt->sr_use_sg = 0;
1344 SRpnt->sr_sglist_len = 0;
1345 SRpnt->sr_bufflen = 0;
1346 SRpnt->sr_buffer = NULL;
1347 SRpnt->sr_underflow = 0;
1348 SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */
1349
1350 srp->my_cmdp = NULL;
1351
1352 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1353 sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result));
1354 srp->header.resid = SCpnt->resid;
1355 ms = jiffies_to_msecs(jiffies);
1356 srp->header.duration = (ms > srp->header.duration) ?
1357 (ms - srp->header.duration) : 0;
1358 if (0 != SRpnt->sr_result) {
1359 struct scsi_sense_hdr sshdr;
1360
1361 memcpy(srp->sense_b, SRpnt->sr_sense_buffer,
1362 sizeof (srp->sense_b));
1363 srp->header.status = 0xff & SRpnt->sr_result;
1364 srp->header.masked_status = status_byte(SRpnt->sr_result);
1365 srp->header.msg_status = msg_byte(SRpnt->sr_result);
1366 srp->header.host_status = host_byte(SRpnt->sr_result);
1367 srp->header.driver_status = driver_byte(SRpnt->sr_result);
1368 if ((sdp->sgdebug > 0) &&
1369 ((CHECK_CONDITION == srp->header.masked_status) ||
1370 (COMMAND_TERMINATED == srp->header.masked_status)))
1371 scsi_print_req_sense("sg_cmd_done", SRpnt);
1372
1373 /* Following if statement is a patch supplied by Eric Youngdale */
1374 if (driver_byte(SRpnt->sr_result) != 0
1375 && scsi_command_normalize_sense(SCpnt, &sshdr)
1376 && !scsi_sense_is_deferred(&sshdr)
1377 && sshdr.sense_key == UNIT_ATTENTION
1378 && sdp->device->removable) {
1379 /* Detected possible disc change. Set the bit - this */
1380 /* may be used if there are filesystems using this device */
1381 sdp->device->changed = 1;
1382 }
1383 }
1384 /* Rely on write phase to clean out srp status values, so no "else" */
1385
1386 scsi_release_request(SRpnt);
1387 SRpnt = NULL;
1388 if (sfp->closed) { /* whoops this fd already released, cleanup */
1389 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1390 sg_finish_rem_req(srp);
1391 srp = NULL;
1392 if (NULL == sfp->headrp) {
1393 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1394 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1395 scsi_device_put(sdp->device);
1396 }
1397 sfp = NULL;
1398 }
1399 } else if (srp && srp->orphan) {
1400 if (sfp->keep_orphan)
1401 srp->sg_io_owned = 0;
1402 else {
1403 sg_finish_rem_req(srp);
1404 srp = NULL;
1405 }
1406 }
1407 if (sfp && srp) {
1408 /* Now wake up any sg_read() that is waiting for this packet. */
1409 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1410 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1411 srp->done = 1;
1412 wake_up_interruptible(&sfp->read_wait);
1413 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1414 }
1415 }
1416
1417 static struct file_operations sg_fops = {
1418 .owner = THIS_MODULE,
1419 .read = sg_read,
1420 .write = sg_write,
1421 .poll = sg_poll,
1422 .ioctl = sg_ioctl,
1423 #ifdef CONFIG_COMPAT
1424 .compat_ioctl = sg_compat_ioctl,
1425 #endif
1426 .open = sg_open,
1427 .mmap = sg_mmap,
1428 .release = sg_release,
1429 .fasync = sg_fasync,
1430 };
1431
1432 static struct class *sg_sysfs_class;
1433
1434 static int sg_sysfs_valid = 0;
1435
1436 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1437 {
1438 Sg_device *sdp;
1439 unsigned long iflags;
1440 void *old_sg_dev_arr = NULL;
1441 int k, error;
1442
1443 sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL);
1444 if (!sdp) {
1445 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1446 return -ENOMEM;
1447 }
1448
1449 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1450 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
1451 Sg_device **tmp_da;
1452 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1453 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1454
1455 tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
1456 if (unlikely(!tmp_da))
1457 goto expand_failed;
1458
1459 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1460 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
1461 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
1462 old_sg_dev_arr = sg_dev_arr;
1463 sg_dev_arr = tmp_da;
1464 sg_dev_max = tmp_dev_max;
1465 }
1466
1467 for (k = 0; k < sg_dev_max; k++)
1468 if (!sg_dev_arr[k])
1469 break;
1470 if (unlikely(k >= SG_MAX_DEVS))
1471 goto overflow;
1472
1473 memset(sdp, 0, sizeof(*sdp));
1474 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1475 sprintf(disk->disk_name, "sg%d", k);
1476 disk->first_minor = k;
1477 sdp->disk = disk;
1478 sdp->device = scsidp;
1479 init_waitqueue_head(&sdp->o_excl_wait);
1480 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
1481
1482 sg_nr_dev++;
1483 sg_dev_arr[k] = sdp;
1484 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1485 error = k;
1486
1487 out:
1488 if (error < 0)
1489 kfree(sdp);
1490 kfree(old_sg_dev_arr);
1491 return error;
1492
1493 expand_failed:
1494 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
1495 error = -ENOMEM;
1496 goto out;
1497
1498 overflow:
1499 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1500 printk(KERN_WARNING
1501 "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor "
1502 "number exceeds %d\n", scsidp->host->host_no, scsidp->channel,
1503 scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1);
1504 error = -ENODEV;
1505 goto out;
1506 }
1507
1508 static int
1509 sg_add(struct class_device *cl_dev)
1510 {
1511 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1512 struct gendisk *disk;
1513 Sg_device *sdp = NULL;
1514 struct cdev * cdev = NULL;
1515 int error, k;
1516
1517 disk = alloc_disk(1);
1518 if (!disk) {
1519 printk(KERN_WARNING "alloc_disk failed\n");
1520 return -ENOMEM;
1521 }
1522 disk->major = SCSI_GENERIC_MAJOR;
1523
1524 error = -ENOMEM;
1525 cdev = cdev_alloc();
1526 if (!cdev) {
1527 printk(KERN_WARNING "cdev_alloc failed\n");
1528 goto out;
1529 }
1530 cdev->owner = THIS_MODULE;
1531 cdev->ops = &sg_fops;
1532
1533 error = sg_alloc(disk, scsidp);
1534 if (error < 0) {
1535 printk(KERN_WARNING "sg_alloc failed\n");
1536 goto out;
1537 }
1538 k = error;
1539 sdp = sg_dev_arr[k];
1540
1541 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
1542 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1543 "%s/generic", scsidp->devfs_name);
1544 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1545 if (error) {
1546 devfs_remove("%s/generic", scsidp->devfs_name);
1547 goto out;
1548 }
1549 sdp->cdev = cdev;
1550 if (sg_sysfs_valid) {
1551 struct class_device * sg_class_member;
1552
1553 sg_class_member = class_device_create(sg_sysfs_class,
1554 MKDEV(SCSI_GENERIC_MAJOR, k),
1555 cl_dev->dev, "%s",
1556 disk->disk_name);
1557 if (IS_ERR(sg_class_member))
1558 printk(KERN_WARNING "sg_add: "
1559 "class_device_create failed\n");
1560 class_set_devdata(sg_class_member, sdp);
1561 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1562 &sg_class_member->kobj, "generic");
1563 if (error)
1564 printk(KERN_ERR "sg_add: unable to make symlink "
1565 "'generic' back to sg%d\n", k);
1566 } else
1567 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1568
1569 printk(KERN_NOTICE
1570 "Attached scsi generic sg%d at scsi%d, channel"
1571 " %d, id %d, lun %d, type %d\n", k,
1572 scsidp->host->host_no, scsidp->channel, scsidp->id,
1573 scsidp->lun, scsidp->type);
1574
1575 return 0;
1576
1577 out:
1578 put_disk(disk);
1579 if (cdev)
1580 cdev_del(cdev);
1581 return error;
1582 }
1583
1584 static void
1585 sg_remove(struct class_device *cl_dev)
1586 {
1587 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1588 Sg_device *sdp = NULL;
1589 unsigned long iflags;
1590 Sg_fd *sfp;
1591 Sg_fd *tsfp;
1592 Sg_request *srp;
1593 Sg_request *tsrp;
1594 int k, delay;
1595
1596 if (NULL == sg_dev_arr)
1597 return;
1598 delay = 0;
1599 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1600 for (k = 0; k < sg_dev_max; k++) {
1601 sdp = sg_dev_arr[k];
1602 if ((NULL == sdp) || (sdp->device != scsidp))
1603 continue; /* dirty but lowers nesting */
1604 if (sdp->headfp) {
1605 sdp->detached = 1;
1606 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1607 tsfp = sfp->nextfp;
1608 for (srp = sfp->headrp; srp; srp = tsrp) {
1609 tsrp = srp->nextrp;
1610 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1611 sg_finish_rem_req(srp);
1612 }
1613 if (sfp->closed) {
1614 scsi_device_put(sdp->device);
1615 __sg_remove_sfp(sdp, sfp);
1616 } else {
1617 delay = 1;
1618 wake_up_interruptible(&sfp->read_wait);
1619 kill_fasync(&sfp->async_qp, SIGPOLL,
1620 POLL_HUP);
1621 }
1622 }
1623 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1624 if (NULL == sdp->headfp) {
1625 sg_dev_arr[k] = NULL;
1626 }
1627 } else { /* nothing active, simple case */
1628 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1629 sg_dev_arr[k] = NULL;
1630 }
1631 sg_nr_dev--;
1632 break;
1633 }
1634 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1635
1636 if (sdp) {
1637 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1638 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k));
1639 cdev_del(sdp->cdev);
1640 sdp->cdev = NULL;
1641 devfs_remove("%s/generic", scsidp->devfs_name);
1642 put_disk(sdp->disk);
1643 sdp->disk = NULL;
1644 if (NULL == sdp->headfp)
1645 kfree((char *) sdp);
1646 }
1647
1648 if (delay)
1649 msleep(10); /* dirty detach so delay device destruction */
1650 }
1651
1652 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1653 * of sysfs parameters (which module_param doesn't yet support).
1654 * Sysfs parameters defined explicitly below.
1655 */
1656 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO);
1657 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1658
1659 MODULE_AUTHOR("Douglas Gilbert");
1660 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1661 MODULE_LICENSE("GPL");
1662 MODULE_VERSION(SG_VERSION_STR);
1663
1664 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1665 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1666
1667 static int __init
1668 init_sg(void)
1669 {
1670 int rc;
1671
1672 if (def_reserved_size >= 0)
1673 sg_big_buff = def_reserved_size;
1674
1675 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1676 SG_MAX_DEVS, "sg");
1677 if (rc)
1678 return rc;
1679 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1680 if ( IS_ERR(sg_sysfs_class) ) {
1681 rc = PTR_ERR(sg_sysfs_class);
1682 goto err_out;
1683 }
1684 sg_sysfs_valid = 1;
1685 rc = scsi_register_interface(&sg_interface);
1686 if (0 == rc) {
1687 #ifdef CONFIG_SCSI_PROC_FS
1688 sg_proc_init();
1689 #endif /* CONFIG_SCSI_PROC_FS */
1690 return 0;
1691 }
1692 class_destroy(sg_sysfs_class);
1693 err_out:
1694 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1695 return rc;
1696 }
1697
1698 static void __exit
1699 exit_sg(void)
1700 {
1701 #ifdef CONFIG_SCSI_PROC_FS
1702 sg_proc_cleanup();
1703 #endif /* CONFIG_SCSI_PROC_FS */
1704 scsi_unregister_interface(&sg_interface);
1705 class_destroy(sg_sysfs_class);
1706 sg_sysfs_valid = 0;
1707 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1708 SG_MAX_DEVS);
1709 if (sg_dev_arr != NULL) {
1710 kfree((char *) sg_dev_arr);
1711 sg_dev_arr = NULL;
1712 }
1713 sg_dev_max = 0;
1714 }
1715
1716 static int
1717 sg_start_req(Sg_request * srp)
1718 {
1719 int res;
1720 Sg_fd *sfp = srp->parentfp;
1721 sg_io_hdr_t *hp = &srp->header;
1722 int dxfer_len = (int) hp->dxfer_len;
1723 int dxfer_dir = hp->dxfer_direction;
1724 Sg_scatter_hold *req_schp = &srp->data;
1725 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1726
1727 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1728 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1729 return 0;
1730 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1731 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1732 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1733 res = sg_build_direct(srp, sfp, dxfer_len);
1734 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1735 return res;
1736 }
1737 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1738 sg_link_reserve(sfp, srp, dxfer_len);
1739 else {
1740 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1741 if (res) {
1742 sg_remove_scat(req_schp);
1743 return res;
1744 }
1745 }
1746 return 0;
1747 }
1748
1749 static void
1750 sg_finish_rem_req(Sg_request * srp)
1751 {
1752 Sg_fd *sfp = srp->parentfp;
1753 Sg_scatter_hold *req_schp = &srp->data;
1754
1755 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1756 if (srp->res_used)
1757 sg_unlink_reserve(sfp, srp);
1758 else
1759 sg_remove_scat(req_schp);
1760 sg_remove_request(sfp, srp);
1761 }
1762
1763 static int
1764 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1765 {
1766 int ret_sz;
1767 int elem_sz = sizeof (struct scatterlist);
1768 int sg_bufflen = tablesize * elem_sz;
1769 int mx_sc_elems = tablesize;
1770
1771 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz);
1772 if (!schp->buffer)
1773 return -ENOMEM;
1774 else if (ret_sz != sg_bufflen) {
1775 sg_bufflen = ret_sz;
1776 mx_sc_elems = sg_bufflen / elem_sz;
1777 }
1778 schp->sglist_len = sg_bufflen;
1779 memset(schp->buffer, 0, sg_bufflen);
1780 return mx_sc_elems; /* number of scat_gath elements allocated */
1781 }
1782
1783 #ifdef SG_ALLOW_DIO_CODE
1784 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1785 /* hopefully this generic code will moved to a library */
1786
1787 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1788 - mapping of all pages not successful
1789 - any page is above max_pfn
1790 (i.e., either completely successful or fails)
1791 */
1792 static int
1793 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1794 unsigned long uaddr, size_t count, int rw,
1795 unsigned long max_pfn)
1796 {
1797 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1798 unsigned long start = uaddr >> PAGE_SHIFT;
1799 const int nr_pages = end - start;
1800 int res, i, j;
1801 struct page **pages;
1802
1803 /* User attempted Overflow! */
1804 if ((uaddr + count) < uaddr)
1805 return -EINVAL;
1806
1807 /* Too big */
1808 if (nr_pages > max_pages)
1809 return -ENOMEM;
1810
1811 /* Hmm? */
1812 if (count == 0)
1813 return 0;
1814
1815 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1816 return -ENOMEM;
1817
1818 /* Try to fault in all of the necessary pages */
1819 down_read(&current->mm->mmap_sem);
1820 /* rw==READ means read from drive, write into memory area */
1821 res = get_user_pages(
1822 current,
1823 current->mm,
1824 uaddr,
1825 nr_pages,
1826 rw == READ,
1827 0, /* don't force */
1828 pages,
1829 NULL);
1830 up_read(&current->mm->mmap_sem);
1831
1832 /* Errors and no page mapped should return here */
1833 if (res < nr_pages)
1834 goto out_unmap;
1835
1836 for (i=0; i < nr_pages; i++) {
1837 /* FIXME: flush superflous for rw==READ,
1838 * probably wrong function for rw==WRITE
1839 */
1840 flush_dcache_page(pages[i]);
1841 if (page_to_pfn(pages[i]) > max_pfn)
1842 goto out_unlock;
1843 /* ?? Is locking needed? I don't think so */
1844 /* if (TestSetPageLocked(pages[i]))
1845 goto out_unlock; */
1846 }
1847
1848 /* Populate the scatter/gather list */
1849 sgl[0].page = pages[0];
1850 sgl[0].offset = uaddr & ~PAGE_MASK;
1851 if (nr_pages > 1) {
1852 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1853 count -= sgl[0].length;
1854 for (i=1; i < nr_pages ; i++) {
1855 sgl[i].offset = 0;
1856 sgl[i].page = pages[i];
1857 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1858 count -= PAGE_SIZE;
1859 }
1860 }
1861 else {
1862 sgl[0].length = count;
1863 }
1864
1865 kfree(pages);
1866 return nr_pages;
1867
1868 out_unlock:
1869 /* for (j=0; j < i; j++)
1870 unlock_page(pages[j]); */
1871 res = 0;
1872 out_unmap:
1873 if (res > 0)
1874 for (j=0; j < res; j++)
1875 page_cache_release(pages[j]);
1876 kfree(pages);
1877 return res;
1878 }
1879
1880
1881 /* And unmap them... */
1882 static int
1883 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1884 int dirtied)
1885 {
1886 int i;
1887
1888 for (i=0; i < nr_pages; i++) {
1889 if (dirtied && !PageReserved(sgl[i].page))
1890 SetPageDirty(sgl[i].page);
1891 /* unlock_page(sgl[i].page); */
1892 /* FIXME: cache flush missing for rw==READ
1893 * FIXME: call the correct reference counting function
1894 */
1895 page_cache_release(sgl[i].page);
1896 }
1897
1898 return 0;
1899 }
1900
1901 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1902 #endif
1903
1904
1905 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1906 static int
1907 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1908 {
1909 #ifdef SG_ALLOW_DIO_CODE
1910 sg_io_hdr_t *hp = &srp->header;
1911 Sg_scatter_hold *schp = &srp->data;
1912 int sg_tablesize = sfp->parentdp->sg_tablesize;
1913 struct scatterlist *sgl;
1914 int mx_sc_elems, res;
1915 struct scsi_device *sdev = sfp->parentdp->device;
1916
1917 if (((unsigned long)hp->dxferp &
1918 queue_dma_alignment(sdev->request_queue)) != 0)
1919 return 1;
1920 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1921 if (mx_sc_elems <= 0) {
1922 return 1;
1923 }
1924 sgl = (struct scatterlist *)schp->buffer;
1925 res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len,
1926 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX);
1927 if (res <= 0)
1928 return 1;
1929 schp->k_use_sg = res;
1930 schp->dio_in_use = 1;
1931 hp->info |= SG_INFO_DIRECT_IO;
1932 return 0;
1933 #else
1934 return 1;
1935 #endif
1936 }
1937
1938 static int
1939 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1940 {
1941 int ret_sz;
1942 int blk_size = buff_size;
1943 unsigned char *p = NULL;
1944
1945 if ((blk_size < 0) || (!sfp))
1946 return -EFAULT;
1947 if (0 == blk_size)
1948 ++blk_size; /* don't know why */
1949 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1950 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1951 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1952 buff_size, blk_size));
1953 if (blk_size <= SG_SCATTER_SZ) {
1954 p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz);
1955 if (!p)
1956 return -ENOMEM;
1957 if (blk_size == ret_sz) { /* got it on the first attempt */
1958 schp->k_use_sg = 0;
1959 schp->buffer = p;
1960 schp->bufflen = blk_size;
1961 schp->b_malloc_len = blk_size;
1962 return 0;
1963 }
1964 } else {
1965 p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz);
1966 if (!p)
1967 return -ENOMEM;
1968 }
1969 /* Want some local declarations, so start new block ... */
1970 { /* lets try and build a scatter gather list */
1971 struct scatterlist *sclp;
1972 int k, rem_sz, num;
1973 int mx_sc_elems;
1974 int sg_tablesize = sfp->parentdp->sg_tablesize;
1975 int first = 1;
1976
1977 /* N.B. ret_sz carried into this block ... */
1978 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1979 if (mx_sc_elems < 0)
1980 return mx_sc_elems; /* most likely -ENOMEM */
1981
1982 for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
1983 (rem_sz > 0) && (k < mx_sc_elems);
1984 ++k, rem_sz -= ret_sz, ++sclp) {
1985 if (first)
1986 first = 0;
1987 else {
1988 num =
1989 (rem_sz >
1990 SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1991 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1992 if (!p)
1993 break;
1994 }
1995 sclp->page = virt_to_page(p);
1996 sclp->offset = offset_in_page(p);
1997 sclp->length = ret_sz;
1998
1999 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
2000 k, sg_scatg2virt(sclp), ret_sz));
2001 } /* end of for loop */
2002 schp->k_use_sg = k;
2003 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
2004 schp->bufflen = blk_size;
2005 if (rem_sz > 0) /* must have failed */
2006 return -ENOMEM;
2007 }
2008 return 0;
2009 }
2010
2011 static int
2012 sg_write_xfer(Sg_request * srp)
2013 {
2014 sg_io_hdr_t *hp = &srp->header;
2015 Sg_scatter_hold *schp = &srp->data;
2016 int num_xfer = 0;
2017 int j, k, onum, usglen, ksglen, res;
2018 int iovec_count = (int) hp->iovec_count;
2019 int dxfer_dir = hp->dxfer_direction;
2020 unsigned char *p;
2021 unsigned char __user *up;
2022 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2023
2024 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
2025 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2026 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
2027 if (schp->bufflen < num_xfer)
2028 num_xfer = schp->bufflen;
2029 }
2030 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2031 (new_interface
2032 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2033 return 0;
2034
2035 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2036 num_xfer, iovec_count, schp->k_use_sg));
2037 if (iovec_count) {
2038 onum = iovec_count;
2039 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2040 return -EFAULT;
2041 } else
2042 onum = 1;
2043
2044 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2045 for (j = 0, p = schp->buffer; j < onum; ++j) {
2046 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
2047 if (res)
2048 return res;
2049 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2050 if (__copy_from_user(p, up, usglen))
2051 return -EFAULT;
2052 p += usglen;
2053 num_xfer -= usglen;
2054 if (num_xfer <= 0)
2055 return 0;
2056 }
2057 } else { /* kernel using scatter gather list */
2058 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2059
2060 ksglen = (int) sclp->length;
2061 p = sg_scatg2virt(sclp);
2062 for (j = 0, k = 0; j < onum; ++j) {
2063 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
2064 if (res)
2065 return res;
2066
2067 for (; p; ++sclp, ksglen = (int) sclp->length,
2068 p = sg_scatg2virt(sclp)) {
2069 if (usglen <= 0)
2070 break;
2071 if (ksglen > usglen) {
2072 if (usglen >= num_xfer) {
2073 if (__copy_from_user
2074 (p, up, num_xfer))
2075 return -EFAULT;
2076 return 0;
2077 }
2078 if (__copy_from_user(p, up, usglen))
2079 return -EFAULT;
2080 p += usglen;
2081 ksglen -= usglen;
2082 break;
2083 } else {
2084 if (ksglen >= num_xfer) {
2085 if (__copy_from_user
2086 (p, up, num_xfer))
2087 return -EFAULT;
2088 return 0;
2089 }
2090 if (__copy_from_user(p, up, ksglen))
2091 return -EFAULT;
2092 up += ksglen;
2093 usglen -= ksglen;
2094 }
2095 ++k;
2096 if (k >= schp->k_use_sg)
2097 return 0;
2098 }
2099 }
2100 }
2101 return 0;
2102 }
2103
2104 static int
2105 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
2106 int wr_xf, int *countp, unsigned char __user **up)
2107 {
2108 int num_xfer = (int) hp->dxfer_len;
2109 unsigned char __user *p = hp->dxferp;
2110 int count;
2111
2112 if (0 == sg_num) {
2113 if (wr_xf && ('\0' == hp->interface_id))
2114 count = (int) hp->flags; /* holds "old" input_size */
2115 else
2116 count = num_xfer;
2117 } else {
2118 sg_iovec_t iovec;
2119 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
2120 return -EFAULT;
2121 p = iovec.iov_base;
2122 count = (int) iovec.iov_len;
2123 }
2124 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
2125 return -EFAULT;
2126 if (up)
2127 *up = p;
2128 if (countp)
2129 *countp = count;
2130 return 0;
2131 }
2132
2133 static void
2134 sg_remove_scat(Sg_scatter_hold * schp)
2135 {
2136 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2137 if (schp->buffer && (schp->sglist_len > 0)) {
2138 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2139
2140 if (schp->dio_in_use) {
2141 #ifdef SG_ALLOW_DIO_CODE
2142 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE);
2143 #endif
2144 } else {
2145 int k;
2146
2147 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2148 ++k, ++sclp) {
2149 SCSI_LOG_TIMEOUT(5, printk(
2150 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2151 k, sg_scatg2virt(sclp), sclp->length));
2152 sg_page_free(sg_scatg2virt(sclp), sclp->length);
2153 sclp->page = NULL;
2154 sclp->offset = 0;
2155 sclp->length = 0;
2156 }
2157 }
2158 sg_page_free(schp->buffer, schp->sglist_len);
2159 } else if (schp->buffer)
2160 sg_page_free(schp->buffer, schp->b_malloc_len);
2161 memset(schp, 0, sizeof (*schp));
2162 }
2163
2164 static int
2165 sg_read_xfer(Sg_request * srp)
2166 {
2167 sg_io_hdr_t *hp = &srp->header;
2168 Sg_scatter_hold *schp = &srp->data;
2169 int num_xfer = 0;
2170 int j, k, onum, usglen, ksglen, res;
2171 int iovec_count = (int) hp->iovec_count;
2172 int dxfer_dir = hp->dxfer_direction;
2173 unsigned char *p;
2174 unsigned char __user *up;
2175 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2176
2177 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2178 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2179 num_xfer = hp->dxfer_len;
2180 if (schp->bufflen < num_xfer)
2181 num_xfer = schp->bufflen;
2182 }
2183 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2184 (new_interface
2185 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2186 return 0;
2187
2188 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2189 num_xfer, iovec_count, schp->k_use_sg));
2190 if (iovec_count) {
2191 onum = iovec_count;
2192 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2193 return -EFAULT;
2194 } else
2195 onum = 1;
2196
2197 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2198 for (j = 0, p = schp->buffer; j < onum; ++j) {
2199 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2200 if (res)
2201 return res;
2202 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2203 if (__copy_to_user(up, p, usglen))
2204 return -EFAULT;
2205 p += usglen;
2206 num_xfer -= usglen;
2207 if (num_xfer <= 0)
2208 return 0;
2209 }
2210 } else { /* kernel using scatter gather list */
2211 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2212
2213 ksglen = (int) sclp->length;
2214 p = sg_scatg2virt(sclp);
2215 for (j = 0, k = 0; j < onum; ++j) {
2216 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2217 if (res)
2218 return res;
2219
2220 for (; p; ++sclp, ksglen = (int) sclp->length,
2221 p = sg_scatg2virt(sclp)) {
2222 if (usglen <= 0)
2223 break;
2224 if (ksglen > usglen) {
2225 if (usglen >= num_xfer) {
2226 if (__copy_to_user
2227 (up, p, num_xfer))
2228 return -EFAULT;
2229 return 0;
2230 }
2231 if (__copy_to_user(up, p, usglen))
2232 return -EFAULT;
2233 p += usglen;
2234 ksglen -= usglen;
2235 break;
2236 } else {
2237 if (ksglen >= num_xfer) {
2238 if (__copy_to_user
2239 (up, p, num_xfer))
2240 return -EFAULT;
2241 return 0;
2242 }
2243 if (__copy_to_user(up, p, ksglen))
2244 return -EFAULT;
2245 up += ksglen;
2246 usglen -= ksglen;
2247 }
2248 ++k;
2249 if (k >= schp->k_use_sg)
2250 return 0;
2251 }
2252 }
2253 }
2254 return 0;
2255 }
2256
2257 static int
2258 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2259 {
2260 Sg_scatter_hold *schp = &srp->data;
2261
2262 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2263 num_read_xfer));
2264 if ((!outp) || (num_read_xfer <= 0))
2265 return 0;
2266 if (schp->k_use_sg > 0) {
2267 int k, num;
2268 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2269
2270 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2271 ++k, ++sclp) {
2272 num = (int) sclp->length;
2273 if (num > num_read_xfer) {
2274 if (__copy_to_user
2275 (outp, sg_scatg2virt(sclp), num_read_xfer))
2276 return -EFAULT;
2277 break;
2278 } else {
2279 if (__copy_to_user
2280 (outp, sg_scatg2virt(sclp), num))
2281 return -EFAULT;
2282 num_read_xfer -= num;
2283 if (num_read_xfer <= 0)
2284 break;
2285 outp += num;
2286 }
2287 }
2288 } else {
2289 if (__copy_to_user(outp, schp->buffer, num_read_xfer))
2290 return -EFAULT;
2291 }
2292 return 0;
2293 }
2294
2295 static void
2296 sg_build_reserve(Sg_fd * sfp, int req_size)
2297 {
2298 Sg_scatter_hold *schp = &sfp->reserve;
2299
2300 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2301 do {
2302 if (req_size < PAGE_SIZE)
2303 req_size = PAGE_SIZE;
2304 if (0 == sg_build_indirect(schp, sfp, req_size))
2305 return;
2306 else
2307 sg_remove_scat(schp);
2308 req_size >>= 1; /* divide by 2 */
2309 } while (req_size > (PAGE_SIZE / 2));
2310 }
2311
2312 static void
2313 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2314 {
2315 Sg_scatter_hold *req_schp = &srp->data;
2316 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2317
2318 srp->res_used = 1;
2319 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2320 size = (size + 1) & (~1); /* round to even for aha1542 */
2321 if (rsv_schp->k_use_sg > 0) {
2322 int k, num;
2323 int rem = size;
2324 struct scatterlist *sclp =
2325 (struct scatterlist *) rsv_schp->buffer;
2326
2327 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
2328 num = (int) sclp->length;
2329 if (rem <= num) {
2330 if (0 == k) {
2331 req_schp->k_use_sg = 0;
2332 req_schp->buffer = sg_scatg2virt(sclp);
2333 } else {
2334 sfp->save_scat_len = num;
2335 sclp->length = (unsigned) rem;
2336 req_schp->k_use_sg = k + 1;
2337 req_schp->sglist_len =
2338 rsv_schp->sglist_len;
2339 req_schp->buffer = rsv_schp->buffer;
2340 }
2341 req_schp->bufflen = size;
2342 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2343 break;
2344 } else
2345 rem -= num;
2346 }
2347 if (k >= rsv_schp->k_use_sg)
2348 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2349 } else {
2350 req_schp->k_use_sg = 0;
2351 req_schp->bufflen = size;
2352 req_schp->buffer = rsv_schp->buffer;
2353 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2354 }
2355 }
2356
2357 static void
2358 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2359 {
2360 Sg_scatter_hold *req_schp = &srp->data;
2361 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2362
2363 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2364 (int) req_schp->k_use_sg));
2365 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2366 struct scatterlist *sclp =
2367 (struct scatterlist *) rsv_schp->buffer;
2368
2369 if (sfp->save_scat_len > 0)
2370 (sclp + (req_schp->k_use_sg - 1))->length =
2371 (unsigned) sfp->save_scat_len;
2372 else
2373 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2374 }
2375 req_schp->k_use_sg = 0;
2376 req_schp->bufflen = 0;
2377 req_schp->buffer = NULL;
2378 req_schp->sglist_len = 0;
2379 sfp->save_scat_len = 0;
2380 srp->res_used = 0;
2381 }
2382
2383 static Sg_request *
2384 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2385 {
2386 Sg_request *resp;
2387 unsigned long iflags;
2388
2389 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2390 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2391 /* look for requests that are ready + not SG_IO owned */
2392 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2393 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2394 resp->done = 2; /* guard against other readers */
2395 break;
2396 }
2397 }
2398 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2399 return resp;
2400 }
2401
2402 #ifdef CONFIG_SCSI_PROC_FS
2403 static Sg_request *
2404 sg_get_nth_request(Sg_fd * sfp, int nth)
2405 {
2406 Sg_request *resp;
2407 unsigned long iflags;
2408 int k;
2409
2410 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2411 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2412 ++k, resp = resp->nextrp) ;
2413 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2414 return resp;
2415 }
2416 #endif
2417
2418 /* always adds to end of list */
2419 static Sg_request *
2420 sg_add_request(Sg_fd * sfp)
2421 {
2422 int k;
2423 unsigned long iflags;
2424 Sg_request *resp;
2425 Sg_request *rp = sfp->req_arr;
2426
2427 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2428 resp = sfp->headrp;
2429 if (!resp) {
2430 memset(rp, 0, sizeof (Sg_request));
2431 rp->parentfp = sfp;
2432 resp = rp;
2433 sfp->headrp = resp;
2434 } else {
2435 if (0 == sfp->cmd_q)
2436 resp = NULL; /* command queuing disallowed */
2437 else {
2438 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2439 if (!rp->parentfp)
2440 break;
2441 }
2442 if (k < SG_MAX_QUEUE) {
2443 memset(rp, 0, sizeof (Sg_request));
2444 rp->parentfp = sfp;
2445 while (resp->nextrp)
2446 resp = resp->nextrp;
2447 resp->nextrp = rp;
2448 resp = rp;
2449 } else
2450 resp = NULL;
2451 }
2452 }
2453 if (resp) {
2454 resp->nextrp = NULL;
2455 resp->header.duration = jiffies_to_msecs(jiffies);
2456 resp->my_cmdp = NULL;
2457 }
2458 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2459 return resp;
2460 }
2461
2462 /* Return of 1 for found; 0 for not found */
2463 static int
2464 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2465 {
2466 Sg_request *prev_rp;
2467 Sg_request *rp;
2468 unsigned long iflags;
2469 int res = 0;
2470
2471 if ((!sfp) || (!srp) || (!sfp->headrp))
2472 return res;
2473 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2474 if (srp->my_cmdp)
2475 srp->my_cmdp->upper_private_data = NULL;
2476 prev_rp = sfp->headrp;
2477 if (srp == prev_rp) {
2478 sfp->headrp = prev_rp->nextrp;
2479 prev_rp->parentfp = NULL;
2480 res = 1;
2481 } else {
2482 while ((rp = prev_rp->nextrp)) {
2483 if (srp == rp) {
2484 prev_rp->nextrp = rp->nextrp;
2485 rp->parentfp = NULL;
2486 res = 1;
2487 break;
2488 }
2489 prev_rp = rp;
2490 }
2491 }
2492 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2493 return res;
2494 }
2495
2496 #ifdef CONFIG_SCSI_PROC_FS
2497 static Sg_fd *
2498 sg_get_nth_sfp(Sg_device * sdp, int nth)
2499 {
2500 Sg_fd *resp;
2501 unsigned long iflags;
2502 int k;
2503
2504 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2505 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2506 ++k, resp = resp->nextfp) ;
2507 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2508 return resp;
2509 }
2510 #endif
2511
2512 static Sg_fd *
2513 sg_add_sfp(Sg_device * sdp, int dev)
2514 {
2515 Sg_fd *sfp;
2516 unsigned long iflags;
2517
2518 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL);
2519 if (!sfp)
2520 return NULL;
2521 memset(sfp, 0, sizeof (Sg_fd));
2522 init_waitqueue_head(&sfp->read_wait);
2523 rwlock_init(&sfp->rq_list_lock);
2524
2525 sfp->timeout = SG_DEFAULT_TIMEOUT;
2526 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2527 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2528 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2529 sdp->device->host->unchecked_isa_dma : 1;
2530 sfp->cmd_q = SG_DEF_COMMAND_Q;
2531 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2532 sfp->parentdp = sdp;
2533 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2534 if (!sdp->headfp)
2535 sdp->headfp = sfp;
2536 else { /* add to tail of existing list */
2537 Sg_fd *pfp = sdp->headfp;
2538 while (pfp->nextfp)
2539 pfp = pfp->nextfp;
2540 pfp->nextfp = sfp;
2541 }
2542 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2543 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2544 sg_build_reserve(sfp, sg_big_buff);
2545 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2546 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2547 return sfp;
2548 }
2549
2550 static void
2551 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2552 {
2553 Sg_fd *fp;
2554 Sg_fd *prev_fp;
2555
2556 prev_fp = sdp->headfp;
2557 if (sfp == prev_fp)
2558 sdp->headfp = prev_fp->nextfp;
2559 else {
2560 while ((fp = prev_fp->nextfp)) {
2561 if (sfp == fp) {
2562 prev_fp->nextfp = fp->nextfp;
2563 break;
2564 }
2565 prev_fp = fp;
2566 }
2567 }
2568 if (sfp->reserve.bufflen > 0) {
2569 SCSI_LOG_TIMEOUT(6,
2570 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2571 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2572 if (sfp->mmap_called)
2573 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
2574 sg_remove_scat(&sfp->reserve);
2575 }
2576 sfp->parentdp = NULL;
2577 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2578 sg_page_free((char *) sfp, sizeof (Sg_fd));
2579 }
2580
2581 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2582 static int
2583 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2584 {
2585 Sg_request *srp;
2586 Sg_request *tsrp;
2587 int dirty = 0;
2588 int res = 0;
2589
2590 for (srp = sfp->headrp; srp; srp = tsrp) {
2591 tsrp = srp->nextrp;
2592 if (sg_srp_done(srp, sfp))
2593 sg_finish_rem_req(srp);
2594 else
2595 ++dirty;
2596 }
2597 if (0 == dirty) {
2598 unsigned long iflags;
2599
2600 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2601 __sg_remove_sfp(sdp, sfp);
2602 if (sdp->detached && (NULL == sdp->headfp)) {
2603 int k, maxd;
2604
2605 maxd = sg_dev_max;
2606 for (k = 0; k < maxd; ++k) {
2607 if (sdp == sg_dev_arr[k])
2608 break;
2609 }
2610 if (k < maxd)
2611 sg_dev_arr[k] = NULL;
2612 kfree((char *) sdp);
2613 res = 1;
2614 }
2615 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2616 } else {
2617 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2618 /* only bump the access_count if we actually succeeded in
2619 * throwing another counter on the host module */
2620 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2621 sfp->closed = 1; /* flag dirty state on this fd */
2622 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2623 dirty));
2624 }
2625 return res;
2626 }
2627
2628 static int
2629 sg_res_in_use(Sg_fd * sfp)
2630 {
2631 const Sg_request *srp;
2632 unsigned long iflags;
2633
2634 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2635 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2636 if (srp->res_used)
2637 break;
2638 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2639 return srp ? 1 : 0;
2640 }
2641
2642 /* If retSzp==NULL want exact size or fail */
2643 static char *
2644 sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2645 {
2646 char *resp = NULL;
2647 int page_mask;
2648 int order, a_size;
2649 int resSz = rqSz;
2650
2651 if (rqSz <= 0)
2652 return resp;
2653
2654 if (lowDma)
2655 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
2656 else
2657 page_mask = GFP_ATOMIC | __GFP_NOWARN;
2658
2659 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2660 order++, a_size <<= 1) ;
2661 resp = (char *) __get_free_pages(page_mask, order);
2662 while ((!resp) && order && retSzp) {
2663 --order;
2664 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2665 resp = (char *) __get_free_pages(page_mask, order); /* try half */
2666 resSz = a_size;
2667 }
2668 if (resp) {
2669 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2670 memset(resp, 0, resSz);
2671 if (retSzp)
2672 *retSzp = resSz;
2673 }
2674 return resp;
2675 }
2676
2677 static void
2678 sg_page_free(char *buff, int size)
2679 {
2680 int order, a_size;
2681
2682 if (!buff)
2683 return;
2684 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2685 order++, a_size <<= 1) ;
2686 free_pages((unsigned long) buff, order);
2687 }
2688
2689 #ifndef MAINTENANCE_IN_CMD
2690 #define MAINTENANCE_IN_CMD 0xa3
2691 #endif
2692
2693 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2694 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2695 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
2696 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
2697 };
2698
2699 static int
2700 sg_allow_access(unsigned char opcode, char dev_type)
2701 {
2702 int k;
2703
2704 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2705 return 1;
2706 for (k = 0; k < sizeof (allow_ops); ++k) {
2707 if (opcode == allow_ops[k])
2708 return 1;
2709 }
2710 return 0;
2711 }
2712
2713 #ifdef CONFIG_SCSI_PROC_FS
2714 static int
2715 sg_last_dev(void)
2716 {
2717 int k;
2718 unsigned long iflags;
2719
2720 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2721 for (k = sg_dev_max - 1; k >= 0; --k)
2722 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2723 break;
2724 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2725 return k + 1; /* origin 1 */
2726 }
2727 #endif
2728
2729 static Sg_device *
2730 sg_get_dev(int dev)
2731 {
2732 Sg_device *sdp = NULL;
2733 unsigned long iflags;
2734
2735 if (sg_dev_arr && (dev >= 0)) {
2736 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2737 if (dev < sg_dev_max)
2738 sdp = sg_dev_arr[dev];
2739 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2740 }
2741 return sdp;
2742 }
2743
2744 #ifdef CONFIG_SCSI_PROC_FS
2745
2746 static struct proc_dir_entry *sg_proc_sgp = NULL;
2747
2748 static char sg_proc_sg_dirname[] = "scsi/sg";
2749
2750 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2751
2752 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2753 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2754 size_t count, loff_t *off);
2755 static struct file_operations adio_fops = {
2756 /* .owner, .read and .llseek added in sg_proc_init() */
2757 .open = sg_proc_single_open_adio,
2758 .write = sg_proc_write_adio,
2759 .release = single_release,
2760 };
2761
2762 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2763 static ssize_t sg_proc_write_dressz(struct file *filp,
2764 const char __user *buffer, size_t count, loff_t *off);
2765 static struct file_operations dressz_fops = {
2766 .open = sg_proc_single_open_dressz,
2767 .write = sg_proc_write_dressz,
2768 .release = single_release,
2769 };
2770
2771 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2772 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2773 static struct file_operations version_fops = {
2774 .open = sg_proc_single_open_version,
2775 .release = single_release,
2776 };
2777
2778 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2779 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2780 static struct file_operations devhdr_fops = {
2781 .open = sg_proc_single_open_devhdr,
2782 .release = single_release,
2783 };
2784
2785 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2786 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2787 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2788 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2789 static void dev_seq_stop(struct seq_file *s, void *v);
2790 static struct file_operations dev_fops = {
2791 .open = sg_proc_open_dev,
2792 .release = seq_release,
2793 };
2794 static struct seq_operations dev_seq_ops = {
2795 .start = dev_seq_start,
2796 .next = dev_seq_next,
2797 .stop = dev_seq_stop,
2798 .show = sg_proc_seq_show_dev,
2799 };
2800
2801 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2802 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2803 static struct file_operations devstrs_fops = {
2804 .open = sg_proc_open_devstrs,
2805 .release = seq_release,
2806 };
2807 static struct seq_operations devstrs_seq_ops = {
2808 .start = dev_seq_start,
2809 .next = dev_seq_next,
2810 .stop = dev_seq_stop,
2811 .show = sg_proc_seq_show_devstrs,
2812 };
2813
2814 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2815 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2816 static struct file_operations debug_fops = {
2817 .open = sg_proc_open_debug,
2818 .release = seq_release,
2819 };
2820 static struct seq_operations debug_seq_ops = {
2821 .start = dev_seq_start,
2822 .next = dev_seq_next,
2823 .stop = dev_seq_stop,
2824 .show = sg_proc_seq_show_debug,
2825 };
2826
2827
2828 struct sg_proc_leaf {
2829 const char * name;
2830 struct file_operations * fops;
2831 };
2832
2833 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2834 {"allow_dio", &adio_fops},
2835 {"debug", &debug_fops},
2836 {"def_reserved_size", &dressz_fops},
2837 {"device_hdr", &devhdr_fops},
2838 {"devices", &dev_fops},
2839 {"device_strs", &devstrs_fops},
2840 {"version", &version_fops}
2841 };
2842
2843 static int
2844 sg_proc_init(void)
2845 {
2846 int k, mask;
2847 int num_leaves =
2848 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2849 struct proc_dir_entry *pdep;
2850 struct sg_proc_leaf * leaf;
2851
2852 sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname,
2853 S_IFDIR | S_IRUGO | S_IXUGO, NULL);
2854 if (!sg_proc_sgp)
2855 return 1;
2856 for (k = 0; k < num_leaves; ++k) {
2857 leaf = &sg_proc_leaf_arr[k];
2858 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2859 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2860 if (pdep) {
2861 leaf->fops->owner = THIS_MODULE,
2862 leaf->fops->read = seq_read,
2863 leaf->fops->llseek = seq_lseek,
2864 pdep->proc_fops = leaf->fops;
2865 }
2866 }
2867 return 0;
2868 }
2869
2870 static void
2871 sg_proc_cleanup(void)
2872 {
2873 int k;
2874 int num_leaves =
2875 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2876
2877 if (!sg_proc_sgp)
2878 return;
2879 for (k = 0; k < num_leaves; ++k)
2880 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2881 remove_proc_entry(sg_proc_sg_dirname, NULL);
2882 }
2883
2884
2885 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2886 {
2887 seq_printf(s, "%d\n", *((int *)s->private));
2888 return 0;
2889 }
2890
2891 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2892 {
2893 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2894 }
2895
2896 static ssize_t
2897 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2898 size_t count, loff_t *off)
2899 {
2900 int num;
2901 char buff[11];
2902
2903 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2904 return -EACCES;
2905 num = (count < 10) ? count : 10;
2906 if (copy_from_user(buff, buffer, num))
2907 return -EFAULT;
2908 buff[num] = '\0';
2909 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2910 return count;
2911 }
2912
2913 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2914 {
2915 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2916 }
2917
2918 static ssize_t
2919 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2920 size_t count, loff_t *off)
2921 {
2922 int num;
2923 unsigned long k = ULONG_MAX;
2924 char buff[11];
2925
2926 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2927 return -EACCES;
2928 num = (count < 10) ? count : 10;
2929 if (copy_from_user(buff, buffer, num))
2930 return -EFAULT;
2931 buff[num] = '\0';
2932 k = simple_strtoul(buff, NULL, 10);
2933 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2934 sg_big_buff = k;
2935 return count;
2936 }
2937 return -ERANGE;
2938 }
2939
2940 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2941 {
2942 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2943 sg_version_date);
2944 return 0;
2945 }
2946
2947 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2948 {
2949 return single_open(file, sg_proc_seq_show_version, NULL);
2950 }
2951
2952 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2953 {
2954 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2955 "online\n");
2956 return 0;
2957 }
2958
2959 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2960 {
2961 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2962 }
2963
2964 struct sg_proc_deviter {
2965 loff_t index;
2966 size_t max;
2967 };
2968
2969 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2970 {
2971 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2972
2973 s->private = it;
2974 if (! it)
2975 return NULL;
2976
2977 if (NULL == sg_dev_arr)
2978 return NULL;
2979 it->index = *pos;
2980 it->max = sg_last_dev();
2981 if (it->index >= it->max)
2982 return NULL;
2983 return it;
2984 }
2985
2986 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2987 {
2988 struct sg_proc_deviter * it = s->private;
2989
2990 *pos = ++it->index;
2991 return (it->index < it->max) ? it : NULL;
2992 }
2993
2994 static void dev_seq_stop(struct seq_file *s, void *v)
2995 {
2996 kfree(s->private);
2997 }
2998
2999 static int sg_proc_open_dev(struct inode *inode, struct file *file)
3000 {
3001 return seq_open(file, &dev_seq_ops);
3002 }
3003
3004 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
3005 {
3006 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3007 Sg_device *sdp;
3008 struct scsi_device *scsidp;
3009
3010 sdp = it ? sg_get_dev(it->index) : NULL;
3011 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
3012 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
3013 scsidp->host->host_no, scsidp->channel,
3014 scsidp->id, scsidp->lun, (int) scsidp->type,
3015 1,
3016 (int) scsidp->queue_depth,
3017 (int) scsidp->device_busy,
3018 (int) scsi_device_online(scsidp));
3019 else
3020 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
3021 return 0;
3022 }
3023
3024 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
3025 {
3026 return seq_open(file, &devstrs_seq_ops);
3027 }
3028
3029 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
3030 {
3031 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3032 Sg_device *sdp;
3033 struct scsi_device *scsidp;
3034
3035 sdp = it ? sg_get_dev(it->index) : NULL;
3036 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
3037 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
3038 scsidp->vendor, scsidp->model, scsidp->rev);
3039 else
3040 seq_printf(s, "<no active device>\n");
3041 return 0;
3042 }
3043
3044 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
3045 {
3046 int k, m, new_interface, blen, usg;
3047 Sg_request *srp;
3048 Sg_fd *fp;
3049 const sg_io_hdr_t *hp;
3050 const char * cp;
3051 unsigned int ms;
3052
3053 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
3054 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3055 "(res)sgat=%d low_dma=%d\n", k + 1,
3056 jiffies_to_msecs(fp->timeout),
3057 fp->reserve.bufflen,
3058 (int) fp->reserve.k_use_sg,
3059 (int) fp->low_dma);
3060 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
3061 (int) fp->cmd_q, (int) fp->force_packid,
3062 (int) fp->keep_orphan, (int) fp->closed);
3063 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
3064 hp = &srp->header;
3065 new_interface = (hp->interface_id == '\0') ? 0 : 1;
3066 if (srp->res_used) {
3067 if (new_interface &&
3068 (SG_FLAG_MMAP_IO & hp->flags))
3069 cp = " mmap>> ";
3070 else
3071 cp = " rb>> ";
3072 } else {
3073 if (SG_INFO_DIRECT_IO_MASK & hp->info)
3074 cp = " dio>> ";
3075 else
3076 cp = " ";
3077 }
3078 seq_printf(s, cp);
3079 blen = srp->my_cmdp ?
3080 srp->my_cmdp->sr_bufflen : srp->data.bufflen;
3081 usg = srp->my_cmdp ?
3082 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
3083 seq_printf(s, srp->done ?
3084 ((1 == srp->done) ? "rcv:" : "fin:")
3085 : (srp->my_cmdp ? "act:" : "prior:"));
3086 seq_printf(s, " id=%d blen=%d",
3087 srp->header.pack_id, blen);
3088 if (srp->done)
3089 seq_printf(s, " dur=%d", hp->duration);
3090 else {
3091 ms = jiffies_to_msecs(jiffies);
3092 seq_printf(s, " t_o/elap=%d/%d",
3093 (new_interface ? hp->timeout :
3094 jiffies_to_msecs(fp->timeout)),
3095 (ms > hp->duration ? ms - hp->duration : 0));
3096 }
3097 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
3098 (int) srp->data.cmd_opcode);
3099 }
3100 if (0 == m)
3101 seq_printf(s, " No requests active\n");
3102 }
3103 }
3104
3105 static int sg_proc_open_debug(struct inode *inode, struct file *file)
3106 {
3107 return seq_open(file, &debug_seq_ops);
3108 }
3109
3110 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
3111 {
3112 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3113 Sg_device *sdp;
3114
3115 if (it && (0 == it->index)) {
3116 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
3117 "(origin 1)\n", sg_dev_max, (int)it->max);
3118 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
3119 }
3120 sdp = it ? sg_get_dev(it->index) : NULL;
3121 if (sdp) {
3122 struct scsi_device *scsidp = sdp->device;
3123
3124 if (NULL == scsidp) {
3125 seq_printf(s, "device %d detached ??\n",
3126 (int)it->index);
3127 return 0;
3128 }
3129
3130 if (sg_get_nth_sfp(sdp, 0)) {
3131 seq_printf(s, " >>> device=%s ",
3132 sdp->disk->disk_name);
3133 if (sdp->detached)
3134 seq_printf(s, "detached pending close ");
3135 else
3136 seq_printf
3137 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
3138 scsidp->host->host_no,
3139 scsidp->channel, scsidp->id,
3140 scsidp->lun,
3141 scsidp->host->hostt->emulated);
3142 seq_printf(s, " sg_tablesize=%d excl=%d\n",
3143 sdp->sg_tablesize, sdp->exclude);
3144 }
3145 sg_proc_debug_helper(s, sdp);
3146 }
3147 return 0;
3148 }
3149
3150 #endif /* CONFIG_SCSI_PROC_FS */
3151
3152 module_init(init_sg);
3153 module_exit(exit_sg);
3154 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
linux v2.6.22.y-op