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[SPARC64]: Fix 2 bugs in huge page support.
[linux-2.6/verdex.git] / drivers / scsi / sg.c
blob5a0a19322d01d642fd456c688da0617870aa96ab
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 #include <linux/scatterlist.h>
53
54 #include "scsi.h"
55 #include <scsi/scsi_dbg.h>
56 #include <scsi/scsi_host.h>
57 #include <scsi/scsi_driver.h>
58 #include <scsi/scsi_ioctl.h>
59 #include <scsi/sg.h>
60
61 #include "scsi_logging.h"
62
63 #ifdef CONFIG_SCSI_PROC_FS
64 #include <linux/proc_fs.h>
65 static char *sg_version_date = "20050908";
66
67 static int sg_proc_init(void);
68 static void sg_proc_cleanup(void);
69 #endif
70
71 #define SG_ALLOW_DIO_DEF 0
72 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
73
74 #define SG_MAX_DEVS 32768
75
76 /*
77 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
78 * Then when using 32 bit integers x * m may overflow during the calculation.
79 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
80 * calculates the same, but prevents the overflow when both m and d
81 * are "small" numbers (like HZ and USER_HZ).
82 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
83 * in 32 bits.
84 */
85 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
86
87 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
88
89 int sg_big_buff = SG_DEF_RESERVED_SIZE;
90 /* N.B. This variable is readable and writeable via
91 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
92 of this size (or less if there is not enough memory) will be reserved
93 for use by this file descriptor. [Deprecated usage: this variable is also
94 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
95 the kernel (i.e. it is not a module).] */
96 static int def_reserved_size = -1; /* picks up init parameter */
97 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
98
99 #define SG_SECTOR_SZ 512
100 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
101
102 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
103
104 static int sg_add(struct class_device *, struct class_interface *);
105 static void sg_remove(struct class_device *, struct class_interface *);
106
107 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock
108 file descriptor list for device */
109
110 static struct class_interface sg_interface = {
111 .add = sg_add,
112 .remove = sg_remove,
113 };
114
115 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
116 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
117 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
118 unsigned bufflen; /* Size of (aggregate) data buffer */
119 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
120 struct scatterlist *buffer;/* scatter list */
121 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
122 unsigned char cmd_opcode; /* first byte of command */
123 } Sg_scatter_hold;
124
125 struct sg_device; /* forward declarations */
126 struct sg_fd;
127
128 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
129 struct sg_request *nextrp; /* NULL -> tail request (slist) */
130 struct sg_fd *parentfp; /* NULL -> not in use */
131 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
132 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
133 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
134 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
135 char orphan; /* 1 -> drop on sight, 0 -> normal */
136 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
137 volatile char done; /* 0->before bh, 1->before read, 2->read */
138 } Sg_request;
139
140 typedef struct sg_fd { /* holds the state of a file descriptor */
141 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
142 struct sg_device *parentdp; /* owning device */
143 wait_queue_head_t read_wait; /* queue read until command done */
144 rwlock_t rq_list_lock; /* protect access to list in req_arr */
145 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
146 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
147 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
148 unsigned save_scat_len; /* original length of trunc. scat. element */
149 Sg_request *headrp; /* head of request slist, NULL->empty */
150 struct fasync_struct *async_qp; /* used by asynchronous notification */
151 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
152 char low_dma; /* as in parent but possibly overridden to 1 */
153 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
154 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
155 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
156 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
157 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
158 char mmap_called; /* 0 -> mmap() never called on this fd */
159 } Sg_fd;
160
161 typedef struct sg_device { /* holds the state of each scsi generic device */
162 struct scsi_device *device;
163 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
164 int sg_tablesize; /* adapter's max scatter-gather table size */
165 Sg_fd *headfp; /* first open fd belonging to this device */
166 volatile char detached; /* 0->attached, 1->detached pending removal */
167 volatile char exclude; /* opened for exclusive access */
168 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
169 struct gendisk *disk;
170 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
171 } Sg_device;
172
173 static int sg_fasync(int fd, struct file *filp, int mode);
174 /* tasklet or soft irq callback */
175 static void sg_cmd_done(void *data, char *sense, int result, int resid);
176 static int sg_start_req(Sg_request * srp);
177 static void sg_finish_rem_req(Sg_request * srp);
178 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
179 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
180 int tablesize);
181 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
182 Sg_request * srp);
183 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
184 int blocking, int read_only, Sg_request ** o_srp);
185 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
186 unsigned char *cmnd, int timeout, int blocking);
187 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
188 int wr_xf, int *countp, unsigned char __user **up);
189 static int sg_write_xfer(Sg_request * srp);
190 static int sg_read_xfer(Sg_request * srp);
191 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
192 static void sg_remove_scat(Sg_scatter_hold * schp);
193 static void sg_build_reserve(Sg_fd * sfp, int req_size);
194 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
195 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
196 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
197 static void sg_page_free(struct page *page, int size);
198 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
199 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
200 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
201 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
202 static Sg_request *sg_add_request(Sg_fd * sfp);
203 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
204 static int sg_res_in_use(Sg_fd * sfp);
205 static int sg_allow_access(unsigned char opcode, char dev_type);
206 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
207 static Sg_device *sg_get_dev(int dev);
208 #ifdef CONFIG_SCSI_PROC_FS
209 static int sg_last_dev(void);
210 #endif
211
212 static Sg_device **sg_dev_arr = NULL;
213 static int sg_dev_max;
214 static int sg_nr_dev;
215
216 #define SZ_SG_HEADER sizeof(struct sg_header)
217 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
218 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
219 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
220
221 static int
222 sg_open(struct inode *inode, struct file *filp)
223 {
224 int dev = iminor(inode);
225 int flags = filp->f_flags;
226 struct request_queue *q;
227 Sg_device *sdp;
228 Sg_fd *sfp;
229 int res;
230 int retval;
231
232 nonseekable_open(inode, filp);
233 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
234 sdp = sg_get_dev(dev);
235 if ((!sdp) || (!sdp->device))
236 return -ENXIO;
237 if (sdp->detached)
238 return -ENODEV;
239
240 /* This driver's module count bumped by fops_get in <linux/fs.h> */
241 /* Prevent the device driver from vanishing while we sleep */
242 retval = scsi_device_get(sdp->device);
243 if (retval)
244 return retval;
245
246 if (!((flags & O_NONBLOCK) ||
247 scsi_block_when_processing_errors(sdp->device))) {
248 retval = -ENXIO;
249 /* we are in error recovery for this device */
250 goto error_out;
251 }
252
253 if (flags & O_EXCL) {
254 if (O_RDONLY == (flags & O_ACCMODE)) {
255 retval = -EPERM; /* Can't lock it with read only access */
256 goto error_out;
257 }
258 if (sdp->headfp && (flags & O_NONBLOCK)) {
259 retval = -EBUSY;
260 goto error_out;
261 }
262 res = 0;
263 __wait_event_interruptible(sdp->o_excl_wait,
264 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
265 if (res) {
266 retval = res; /* -ERESTARTSYS because signal hit process */
267 goto error_out;
268 }
269 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
270 if (flags & O_NONBLOCK) {
271 retval = -EBUSY;
272 goto error_out;
273 }
274 res = 0;
275 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
276 res);
277 if (res) {
278 retval = res; /* -ERESTARTSYS because signal hit process */
279 goto error_out;
280 }
281 }
282 if (sdp->detached) {
283 retval = -ENODEV;
284 goto error_out;
285 }
286 if (!sdp->headfp) { /* no existing opens on this device */
287 sdp->sgdebug = 0;
288 q = sdp->device->request_queue;
289 sdp->sg_tablesize = min(q->max_hw_segments,
290 q->max_phys_segments);
291 }
292 if ((sfp = sg_add_sfp(sdp, dev)))
293 filp->private_data = sfp;
294 else {
295 if (flags & O_EXCL)
296 sdp->exclude = 0; /* undo if error */
297 retval = -ENOMEM;
298 goto error_out;
299 }
300 return 0;
301
302 error_out:
303 scsi_device_put(sdp->device);
304 return retval;
305 }
306
307 /* Following function was formerly called 'sg_close' */
308 static int
309 sg_release(struct inode *inode, struct file *filp)
310 {
311 Sg_device *sdp;
312 Sg_fd *sfp;
313
314 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
315 return -ENXIO;
316 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
317 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
318 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
319 if (!sdp->detached) {
320 scsi_device_put(sdp->device);
321 }
322 sdp->exclude = 0;
323 wake_up_interruptible(&sdp->o_excl_wait);
324 }
325 return 0;
326 }
327
328 static ssize_t
329 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
330 {
331 Sg_device *sdp;
332 Sg_fd *sfp;
333 Sg_request *srp;
334 int req_pack_id = -1;
335 sg_io_hdr_t *hp;
336 struct sg_header *old_hdr = NULL;
337 int retval = 0;
338
339 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
340 return -ENXIO;
341 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
342 sdp->disk->disk_name, (int) count));
343
344 if (!access_ok(VERIFY_WRITE, buf, count))
345 return -EFAULT;
346 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
347 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
348 if (!old_hdr)
349 return -ENOMEM;
350 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
351 retval = -EFAULT;
352 goto free_old_hdr;
353 }
354 if (old_hdr->reply_len < 0) {
355 if (count >= SZ_SG_IO_HDR) {
356 sg_io_hdr_t *new_hdr;
357 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
358 if (!new_hdr) {
359 retval = -ENOMEM;
360 goto free_old_hdr;
361 }
362 retval =__copy_from_user
363 (new_hdr, buf, SZ_SG_IO_HDR);
364 req_pack_id = new_hdr->pack_id;
365 kfree(new_hdr);
366 if (retval) {
367 retval = -EFAULT;
368 goto free_old_hdr;
369 }
370 }
371 } else
372 req_pack_id = old_hdr->pack_id;
373 }
374 srp = sg_get_rq_mark(sfp, req_pack_id);
375 if (!srp) { /* now wait on packet to arrive */
376 if (sdp->detached) {
377 retval = -ENODEV;
378 goto free_old_hdr;
379 }
380 if (filp->f_flags & O_NONBLOCK) {
381 retval = -EAGAIN;
382 goto free_old_hdr;
383 }
384 while (1) {
385 retval = 0; /* following macro beats race condition */
386 __wait_event_interruptible(sfp->read_wait,
387 (sdp->detached ||
388 (srp = sg_get_rq_mark(sfp, req_pack_id))),
389 retval);
390 if (sdp->detached) {
391 retval = -ENODEV;
392 goto free_old_hdr;
393 }
394 if (0 == retval)
395 break;
396
397 /* -ERESTARTSYS as signal hit process */
398 goto free_old_hdr;
399 }
400 }
401 if (srp->header.interface_id != '\0') {
402 retval = sg_new_read(sfp, buf, count, srp);
403 goto free_old_hdr;
404 }
405
406 hp = &srp->header;
407 if (old_hdr == NULL) {
408 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
409 if (! old_hdr) {
410 retval = -ENOMEM;
411 goto free_old_hdr;
412 }
413 }
414 memset(old_hdr, 0, SZ_SG_HEADER);
415 old_hdr->reply_len = (int) hp->timeout;
416 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
417 old_hdr->pack_id = hp->pack_id;
418 old_hdr->twelve_byte =
419 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
420 old_hdr->target_status = hp->masked_status;
421 old_hdr->host_status = hp->host_status;
422 old_hdr->driver_status = hp->driver_status;
423 if ((CHECK_CONDITION & hp->masked_status) ||
424 (DRIVER_SENSE & hp->driver_status))
425 memcpy(old_hdr->sense_buffer, srp->sense_b,
426 sizeof (old_hdr->sense_buffer));
427 switch (hp->host_status) {
428 /* This setup of 'result' is for backward compatibility and is best
429 ignored by the user who should use target, host + driver status */
430 case DID_OK:
431 case DID_PASSTHROUGH:
432 case DID_SOFT_ERROR:
433 old_hdr->result = 0;
434 break;
435 case DID_NO_CONNECT:
436 case DID_BUS_BUSY:
437 case DID_TIME_OUT:
438 old_hdr->result = EBUSY;
439 break;
440 case DID_BAD_TARGET:
441 case DID_ABORT:
442 case DID_PARITY:
443 case DID_RESET:
444 case DID_BAD_INTR:
445 old_hdr->result = EIO;
446 break;
447 case DID_ERROR:
448 old_hdr->result = (srp->sense_b[0] == 0 &&
449 hp->masked_status == GOOD) ? 0 : EIO;
450 break;
451 default:
452 old_hdr->result = EIO;
453 break;
454 }
455
456 /* Now copy the result back to the user buffer. */
457 if (count >= SZ_SG_HEADER) {
458 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
459 retval = -EFAULT;
460 goto free_old_hdr;
461 }
462 buf += SZ_SG_HEADER;
463 if (count > old_hdr->reply_len)
464 count = old_hdr->reply_len;
465 if (count > SZ_SG_HEADER) {
466 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
467 retval = -EFAULT;
468 goto free_old_hdr;
469 }
470 }
471 } else
472 count = (old_hdr->result == 0) ? 0 : -EIO;
473 sg_finish_rem_req(srp);
474 retval = count;
475 free_old_hdr:
476 kfree(old_hdr);
477 return retval;
478 }
479
480 static ssize_t
481 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
482 {
483 sg_io_hdr_t *hp = &srp->header;
484 int err = 0;
485 int len;
486
487 if (count < SZ_SG_IO_HDR) {
488 err = -EINVAL;
489 goto err_out;
490 }
491 hp->sb_len_wr = 0;
492 if ((hp->mx_sb_len > 0) && hp->sbp) {
493 if ((CHECK_CONDITION & hp->masked_status) ||
494 (DRIVER_SENSE & hp->driver_status)) {
495 int sb_len = SCSI_SENSE_BUFFERSIZE;
496 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
497 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
498 len = (len > sb_len) ? sb_len : len;
499 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
500 err = -EFAULT;
501 goto err_out;
502 }
503 hp->sb_len_wr = len;
504 }
505 }
506 if (hp->masked_status || hp->host_status || hp->driver_status)
507 hp->info |= SG_INFO_CHECK;
508 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
509 err = -EFAULT;
510 goto err_out;
511 }
512 err = sg_read_xfer(srp);
513 err_out:
514 sg_finish_rem_req(srp);
515 return (0 == err) ? count : err;
516 }
517
518 static ssize_t
519 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
520 {
521 int mxsize, cmd_size, k;
522 int input_size, blocking;
523 unsigned char opcode;
524 Sg_device *sdp;
525 Sg_fd *sfp;
526 Sg_request *srp;
527 struct sg_header old_hdr;
528 sg_io_hdr_t *hp;
529 unsigned char cmnd[MAX_COMMAND_SIZE];
530
531 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
532 return -ENXIO;
533 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
534 sdp->disk->disk_name, (int) count));
535 if (sdp->detached)
536 return -ENODEV;
537 if (!((filp->f_flags & O_NONBLOCK) ||
538 scsi_block_when_processing_errors(sdp->device)))
539 return -ENXIO;
540
541 if (!access_ok(VERIFY_READ, buf, count))
542 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
543 if (count < SZ_SG_HEADER)
544 return -EIO;
545 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
546 return -EFAULT;
547 blocking = !(filp->f_flags & O_NONBLOCK);
548 if (old_hdr.reply_len < 0)
549 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
550 if (count < (SZ_SG_HEADER + 6))
551 return -EIO; /* The minimum scsi command length is 6 bytes. */
552
553 if (!(srp = sg_add_request(sfp))) {
554 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
555 return -EDOM;
556 }
557 buf += SZ_SG_HEADER;
558 __get_user(opcode, buf);
559 if (sfp->next_cmd_len > 0) {
560 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
561 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
562 sfp->next_cmd_len = 0;
563 sg_remove_request(sfp, srp);
564 return -EIO;
565 }
566 cmd_size = sfp->next_cmd_len;
567 sfp->next_cmd_len = 0; /* reset so only this write() effected */
568 } else {
569 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
570 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
571 cmd_size = 12;
572 }
573 SCSI_LOG_TIMEOUT(4, printk(
574 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
575 /* Determine buffer size. */
576 input_size = count - cmd_size;
577 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
578 mxsize -= SZ_SG_HEADER;
579 input_size -= SZ_SG_HEADER;
580 if (input_size < 0) {
581 sg_remove_request(sfp, srp);
582 return -EIO; /* User did not pass enough bytes for this command. */
583 }
584 hp = &srp->header;
585 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
586 hp->cmd_len = (unsigned char) cmd_size;
587 hp->iovec_count = 0;
588 hp->mx_sb_len = 0;
589 if (input_size > 0)
590 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
591 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
592 else
593 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
594 hp->dxfer_len = mxsize;
595 hp->dxferp = (char __user *)buf + cmd_size;
596 hp->sbp = NULL;
597 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
598 hp->flags = input_size; /* structure abuse ... */
599 hp->pack_id = old_hdr.pack_id;
600 hp->usr_ptr = NULL;
601 if (__copy_from_user(cmnd, buf, cmd_size))
602 return -EFAULT;
603 /*
604 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
605 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
606 * is a non-zero input_size, so emit a warning.
607 */
608 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)
609 if (printk_ratelimit())
610 printk(KERN_WARNING
611 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
612 "guessing data in;\n" KERN_WARNING " "
613 "program %s not setting count and/or reply_len properly\n",
614 old_hdr.reply_len - (int)SZ_SG_HEADER,
615 input_size, (unsigned int) cmnd[0],
616 current->comm);
617 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
618 return (k < 0) ? k : count;
619 }
620
621 static ssize_t
622 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
623 int blocking, int read_only, Sg_request ** o_srp)
624 {
625 int k;
626 Sg_request *srp;
627 sg_io_hdr_t *hp;
628 unsigned char cmnd[MAX_COMMAND_SIZE];
629 int timeout;
630 unsigned long ul_timeout;
631
632 if (count < SZ_SG_IO_HDR)
633 return -EINVAL;
634 if (!access_ok(VERIFY_READ, buf, count))
635 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
636
637 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
638 if (!(srp = sg_add_request(sfp))) {
639 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
640 return -EDOM;
641 }
642 hp = &srp->header;
643 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
644 sg_remove_request(sfp, srp);
645 return -EFAULT;
646 }
647 if (hp->interface_id != 'S') {
648 sg_remove_request(sfp, srp);
649 return -ENOSYS;
650 }
651 if (hp->flags & SG_FLAG_MMAP_IO) {
652 if (hp->dxfer_len > sfp->reserve.bufflen) {
653 sg_remove_request(sfp, srp);
654 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
655 }
656 if (hp->flags & SG_FLAG_DIRECT_IO) {
657 sg_remove_request(sfp, srp);
658 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
659 }
660 if (sg_res_in_use(sfp)) {
661 sg_remove_request(sfp, srp);
662 return -EBUSY; /* reserve buffer already being used */
663 }
664 }
665 ul_timeout = msecs_to_jiffies(srp->header.timeout);
666 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
667 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
668 sg_remove_request(sfp, srp);
669 return -EMSGSIZE;
670 }
671 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
672 sg_remove_request(sfp, srp);
673 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
674 }
675 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
676 sg_remove_request(sfp, srp);
677 return -EFAULT;
678 }
679 if (read_only &&
680 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
681 sg_remove_request(sfp, srp);
682 return -EPERM;
683 }
684 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
685 if (k < 0)
686 return k;
687 if (o_srp)
688 *o_srp = srp;
689 return count;
690 }
691
692 static int
693 sg_common_write(Sg_fd * sfp, Sg_request * srp,
694 unsigned char *cmnd, int timeout, int blocking)
695 {
696 int k, data_dir;
697 Sg_device *sdp = sfp->parentdp;
698 sg_io_hdr_t *hp = &srp->header;
699
700 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
701 hp->status = 0;
702 hp->masked_status = 0;
703 hp->msg_status = 0;
704 hp->info = 0;
705 hp->host_status = 0;
706 hp->driver_status = 0;
707 hp->resid = 0;
708 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
709 (int) cmnd[0], (int) hp->cmd_len));
710
711 if ((k = sg_start_req(srp))) {
712 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
713 sg_finish_rem_req(srp);
714 return k; /* probably out of space --> ENOMEM */
715 }
716 if ((k = sg_write_xfer(srp))) {
717 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
718 sg_finish_rem_req(srp);
719 return k;
720 }
721 if (sdp->detached) {
722 sg_finish_rem_req(srp);
723 return -ENODEV;
724 }
725
726 switch (hp->dxfer_direction) {
727 case SG_DXFER_TO_FROM_DEV:
728 case SG_DXFER_FROM_DEV:
729 data_dir = DMA_FROM_DEVICE;
730 break;
731 case SG_DXFER_TO_DEV:
732 data_dir = DMA_TO_DEVICE;
733 break;
734 case SG_DXFER_UNKNOWN:
735 data_dir = DMA_BIDIRECTIONAL;
736 break;
737 default:
738 data_dir = DMA_NONE;
739 break;
740 }
741 hp->duration = jiffies_to_msecs(jiffies);
742 /* Now send everything of to mid-level. The next time we hear about this
743 packet is when sg_cmd_done() is called (i.e. a callback). */
744 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer,
745 hp->dxfer_len, srp->data.k_use_sg, timeout,
746 SG_DEFAULT_RETRIES, srp, sg_cmd_done,
747 GFP_ATOMIC)) {
748 SCSI_LOG_TIMEOUT(1, printk("sg_write: scsi_execute_async failed\n"));
749 /*
750 * most likely out of mem, but could also be a bad map
751 */
752 return -ENOMEM;
753 } else
754 return 0;
755 }
756
757 static int
758 sg_srp_done(Sg_request *srp, Sg_fd *sfp)
759 {
760 unsigned long iflags;
761 int done;
762
763 read_lock_irqsave(&sfp->rq_list_lock, iflags);
764 done = srp->done;
765 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
766 return done;
767 }
768
769 static int
770 sg_ioctl(struct inode *inode, struct file *filp,
771 unsigned int cmd_in, unsigned long arg)
772 {
773 void __user *p = (void __user *)arg;
774 int __user *ip = p;
775 int result, val, read_only;
776 Sg_device *sdp;
777 Sg_fd *sfp;
778 Sg_request *srp;
779 unsigned long iflags;
780
781 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
782 return -ENXIO;
783 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
784 sdp->disk->disk_name, (int) cmd_in));
785 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
786
787 switch (cmd_in) {
788 case SG_IO:
789 {
790 int blocking = 1; /* ignore O_NONBLOCK flag */
791
792 if (sdp->detached)
793 return -ENODEV;
794 if (!scsi_block_when_processing_errors(sdp->device))
795 return -ENXIO;
796 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
797 return -EFAULT;
798 result =
799 sg_new_write(sfp, p, SZ_SG_IO_HDR,
800 blocking, read_only, &srp);
801 if (result < 0)
802 return result;
803 srp->sg_io_owned = 1;
804 while (1) {
805 result = 0; /* following macro to beat race condition */
806 __wait_event_interruptible(sfp->read_wait,
807 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
808 result);
809 if (sdp->detached)
810 return -ENODEV;
811 if (sfp->closed)
812 return 0; /* request packet dropped already */
813 if (0 == result)
814 break;
815 srp->orphan = 1;
816 return result; /* -ERESTARTSYS because signal hit process */
817 }
818 write_lock_irqsave(&sfp->rq_list_lock, iflags);
819 srp->done = 2;
820 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
821 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
822 return (result < 0) ? result : 0;
823 }
824 case SG_SET_TIMEOUT:
825 result = get_user(val, ip);
826 if (result)
827 return result;
828 if (val < 0)
829 return -EIO;
830 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
831 val = MULDIV (INT_MAX, USER_HZ, HZ);
832 sfp->timeout_user = val;
833 sfp->timeout = MULDIV (val, HZ, USER_HZ);
834
835 return 0;
836 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
837 /* strange ..., for backward compatibility */
838 return sfp->timeout_user;
839 case SG_SET_FORCE_LOW_DMA:
840 result = get_user(val, ip);
841 if (result)
842 return result;
843 if (val) {
844 sfp->low_dma = 1;
845 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
846 val = (int) sfp->reserve.bufflen;
847 sg_remove_scat(&sfp->reserve);
848 sg_build_reserve(sfp, val);
849 }
850 } else {
851 if (sdp->detached)
852 return -ENODEV;
853 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
854 }
855 return 0;
856 case SG_GET_LOW_DMA:
857 return put_user((int) sfp->low_dma, ip);
858 case SG_GET_SCSI_ID:
859 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
860 return -EFAULT;
861 else {
862 sg_scsi_id_t __user *sg_idp = p;
863
864 if (sdp->detached)
865 return -ENODEV;
866 __put_user((int) sdp->device->host->host_no,
867 &sg_idp->host_no);
868 __put_user((int) sdp->device->channel,
869 &sg_idp->channel);
870 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
871 __put_user((int) sdp->device->lun, &sg_idp->lun);
872 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
873 __put_user((short) sdp->device->host->cmd_per_lun,
874 &sg_idp->h_cmd_per_lun);
875 __put_user((short) sdp->device->queue_depth,
876 &sg_idp->d_queue_depth);
877 __put_user(0, &sg_idp->unused[0]);
878 __put_user(0, &sg_idp->unused[1]);
879 return 0;
880 }
881 case SG_SET_FORCE_PACK_ID:
882 result = get_user(val, ip);
883 if (result)
884 return result;
885 sfp->force_packid = val ? 1 : 0;
886 return 0;
887 case SG_GET_PACK_ID:
888 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
889 return -EFAULT;
890 read_lock_irqsave(&sfp->rq_list_lock, iflags);
891 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
892 if ((1 == srp->done) && (!srp->sg_io_owned)) {
893 read_unlock_irqrestore(&sfp->rq_list_lock,
894 iflags);
895 __put_user(srp->header.pack_id, ip);
896 return 0;
897 }
898 }
899 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
900 __put_user(-1, ip);
901 return 0;
902 case SG_GET_NUM_WAITING:
903 read_lock_irqsave(&sfp->rq_list_lock, iflags);
904 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
905 if ((1 == srp->done) && (!srp->sg_io_owned))
906 ++val;
907 }
908 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
909 return put_user(val, ip);
910 case SG_GET_SG_TABLESIZE:
911 return put_user(sdp->sg_tablesize, ip);
912 case SG_SET_RESERVED_SIZE:
913 result = get_user(val, ip);
914 if (result)
915 return result;
916 if (val < 0)
917 return -EINVAL;
918 if (val != sfp->reserve.bufflen) {
919 if (sg_res_in_use(sfp) || sfp->mmap_called)
920 return -EBUSY;
921 sg_remove_scat(&sfp->reserve);
922 sg_build_reserve(sfp, val);
923 }
924 return 0;
925 case SG_GET_RESERVED_SIZE:
926 val = (int) sfp->reserve.bufflen;
927 return put_user(val, ip);
928 case SG_SET_COMMAND_Q:
929 result = get_user(val, ip);
930 if (result)
931 return result;
932 sfp->cmd_q = val ? 1 : 0;
933 return 0;
934 case SG_GET_COMMAND_Q:
935 return put_user((int) sfp->cmd_q, ip);
936 case SG_SET_KEEP_ORPHAN:
937 result = get_user(val, ip);
938 if (result)
939 return result;
940 sfp->keep_orphan = val;
941 return 0;
942 case SG_GET_KEEP_ORPHAN:
943 return put_user((int) sfp->keep_orphan, ip);
944 case SG_NEXT_CMD_LEN:
945 result = get_user(val, ip);
946 if (result)
947 return result;
948 sfp->next_cmd_len = (val > 0) ? val : 0;
949 return 0;
950 case SG_GET_VERSION_NUM:
951 return put_user(sg_version_num, ip);
952 case SG_GET_ACCESS_COUNT:
953 /* faked - we don't have a real access count anymore */
954 val = (sdp->device ? 1 : 0);
955 return put_user(val, ip);
956 case SG_GET_REQUEST_TABLE:
957 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
958 return -EFAULT;
959 else {
960 sg_req_info_t *rinfo;
961 unsigned int ms;
962
963 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
964 GFP_KERNEL);
965 if (!rinfo)
966 return -ENOMEM;
967 read_lock_irqsave(&sfp->rq_list_lock, iflags);
968 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
969 ++val, srp = srp ? srp->nextrp : srp) {
970 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
971 if (srp) {
972 rinfo[val].req_state = srp->done + 1;
973 rinfo[val].problem =
974 srp->header.masked_status &
975 srp->header.host_status &
976 srp->header.driver_status;
977 if (srp->done)
978 rinfo[val].duration =
979 srp->header.duration;
980 else {
981 ms = jiffies_to_msecs(jiffies);
982 rinfo[val].duration =
983 (ms > srp->header.duration) ?
984 (ms - srp->header.duration) : 0;
985 }
986 rinfo[val].orphan = srp->orphan;
987 rinfo[val].sg_io_owned =
988 srp->sg_io_owned;
989 rinfo[val].pack_id =
990 srp->header.pack_id;
991 rinfo[val].usr_ptr =
992 srp->header.usr_ptr;
993 }
994 }
995 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
996 result = __copy_to_user(p, rinfo,
997 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
998 result = result ? -EFAULT : 0;
999 kfree(rinfo);
1000 return result;
1001 }
1002 case SG_EMULATED_HOST:
1003 if (sdp->detached)
1004 return -ENODEV;
1005 return put_user(sdp->device->host->hostt->emulated, ip);
1006 case SG_SCSI_RESET:
1007 if (sdp->detached)
1008 return -ENODEV;
1009 if (filp->f_flags & O_NONBLOCK) {
1010 if (scsi_host_in_recovery(sdp->device->host))
1011 return -EBUSY;
1012 } else if (!scsi_block_when_processing_errors(sdp->device))
1013 return -EBUSY;
1014 result = get_user(val, ip);
1015 if (result)
1016 return result;
1017 if (SG_SCSI_RESET_NOTHING == val)
1018 return 0;
1019 switch (val) {
1020 case SG_SCSI_RESET_DEVICE:
1021 val = SCSI_TRY_RESET_DEVICE;
1022 break;
1023 case SG_SCSI_RESET_BUS:
1024 val = SCSI_TRY_RESET_BUS;
1025 break;
1026 case SG_SCSI_RESET_HOST:
1027 val = SCSI_TRY_RESET_HOST;
1028 break;
1029 default:
1030 return -EINVAL;
1031 }
1032 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1033 return -EACCES;
1034 return (scsi_reset_provider(sdp->device, val) ==
1035 SUCCESS) ? 0 : -EIO;
1036 case SCSI_IOCTL_SEND_COMMAND:
1037 if (sdp->detached)
1038 return -ENODEV;
1039 if (read_only) {
1040 unsigned char opcode = WRITE_6;
1041 Scsi_Ioctl_Command __user *siocp = p;
1042
1043 if (copy_from_user(&opcode, siocp->data, 1))
1044 return -EFAULT;
1045 if (!sg_allow_access(opcode, sdp->device->type))
1046 return -EPERM;
1047 }
1048 return scsi_ioctl_send_command(sdp->device, p);
1049 case SG_SET_DEBUG:
1050 result = get_user(val, ip);
1051 if (result)
1052 return result;
1053 sdp->sgdebug = (char) val;
1054 return 0;
1055 case SCSI_IOCTL_GET_IDLUN:
1056 case SCSI_IOCTL_GET_BUS_NUMBER:
1057 case SCSI_IOCTL_PROBE_HOST:
1058 case SG_GET_TRANSFORM:
1059 if (sdp->detached)
1060 return -ENODEV;
1061 return scsi_ioctl(sdp->device, cmd_in, p);
1062 default:
1063 if (read_only)
1064 return -EPERM; /* don't know so take safe approach */
1065 return scsi_ioctl(sdp->device, cmd_in, p);
1066 }
1067 }
1068
1069 #ifdef CONFIG_COMPAT
1070 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1071 {
1072 Sg_device *sdp;
1073 Sg_fd *sfp;
1074 struct scsi_device *sdev;
1075
1076 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1077 return -ENXIO;
1078
1079 sdev = sdp->device;
1080 if (sdev->host->hostt->compat_ioctl) {
1081 int ret;
1082
1083 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1084
1085 return ret;
1086 }
1087
1088 return -ENOIOCTLCMD;
1089 }
1090 #endif
1091
1092 static unsigned int
1093 sg_poll(struct file *filp, poll_table * wait)
1094 {
1095 unsigned int res = 0;
1096 Sg_device *sdp;
1097 Sg_fd *sfp;
1098 Sg_request *srp;
1099 int count = 0;
1100 unsigned long iflags;
1101
1102 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1103 || sfp->closed)
1104 return POLLERR;
1105 poll_wait(filp, &sfp->read_wait, wait);
1106 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1107 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1108 /* if any read waiting, flag it */
1109 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1110 res = POLLIN | POLLRDNORM;
1111 ++count;
1112 }
1113 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1114
1115 if (sdp->detached)
1116 res |= POLLHUP;
1117 else if (!sfp->cmd_q) {
1118 if (0 == count)
1119 res |= POLLOUT | POLLWRNORM;
1120 } else if (count < SG_MAX_QUEUE)
1121 res |= POLLOUT | POLLWRNORM;
1122 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1123 sdp->disk->disk_name, (int) res));
1124 return res;
1125 }
1126
1127 static int
1128 sg_fasync(int fd, struct file *filp, int mode)
1129 {
1130 int retval;
1131 Sg_device *sdp;
1132 Sg_fd *sfp;
1133
1134 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1135 return -ENXIO;
1136 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1137 sdp->disk->disk_name, mode));
1138
1139 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1140 return (retval < 0) ? retval : 0;
1141 }
1142
1143 /* When startFinish==1 increments page counts for pages other than the
1144 first of scatter gather elements obtained from alloc_pages().
1145 When startFinish==0 decrements ... */
1146 static void
1147 sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
1148 {
1149 struct scatterlist *sg = rsv_schp->buffer;
1150 struct page *page;
1151 int k, m;
1152
1153 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1154 startFinish, rsv_schp->k_use_sg));
1155 /* N.B. correction _not_ applied to base page of each allocation */
1156 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) {
1157 for (m = PAGE_SIZE; m < sg->length; m += PAGE_SIZE) {
1158 page = sg->page;
1159 if (startFinish)
1160 get_page(page);
1161 else {
1162 if (page_count(page) > 0)
1163 __put_page(page);
1164 }
1165 }
1166 }
1167 }
1168
1169 static struct page *
1170 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1171 {
1172 Sg_fd *sfp;
1173 struct page *page = NOPAGE_SIGBUS;
1174 unsigned long offset, len, sa;
1175 Sg_scatter_hold *rsv_schp;
1176 struct scatterlist *sg;
1177 int k;
1178
1179 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1180 return page;
1181 rsv_schp = &sfp->reserve;
1182 offset = addr - vma->vm_start;
1183 if (offset >= rsv_schp->bufflen)
1184 return page;
1185 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1186 offset, rsv_schp->k_use_sg));
1187 sg = rsv_schp->buffer;
1188 sa = vma->vm_start;
1189 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1190 ++k, ++sg) {
1191 len = vma->vm_end - sa;
1192 len = (len < sg->length) ? len : sg->length;
1193 if (offset < len) {
1194 page = sg->page;
1195 get_page(page); /* increment page count */
1196 break;
1197 }
1198 sa += len;
1199 offset -= len;
1200 }
1201
1202 if (type)
1203 *type = VM_FAULT_MINOR;
1204 return page;
1205 }
1206
1207 static struct vm_operations_struct sg_mmap_vm_ops = {
1208 .nopage = sg_vma_nopage,
1209 };
1210
1211 static int
1212 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1213 {
1214 Sg_fd *sfp;
1215 unsigned long req_sz, len, sa;
1216 Sg_scatter_hold *rsv_schp;
1217 int k;
1218 struct scatterlist *sg;
1219
1220 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1221 return -ENXIO;
1222 req_sz = vma->vm_end - vma->vm_start;
1223 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1224 (void *) vma->vm_start, (int) req_sz));
1225 if (vma->vm_pgoff)
1226 return -EINVAL; /* want no offset */
1227 rsv_schp = &sfp->reserve;
1228 if (req_sz > rsv_schp->bufflen)
1229 return -ENOMEM; /* cannot map more than reserved buffer */
1230
1231 sa = vma->vm_start;
1232 sg = rsv_schp->buffer;
1233 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1234 ++k, ++sg) {
1235 len = vma->vm_end - sa;
1236 len = (len < sg->length) ? len : sg->length;
1237 sa += len;
1238 }
1239
1240 if (0 == sfp->mmap_called) {
1241 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
1242 sfp->mmap_called = 1;
1243 }
1244 vma->vm_flags |= VM_RESERVED;
1245 vma->vm_private_data = sfp;
1246 vma->vm_ops = &sg_mmap_vm_ops;
1247 return 0;
1248 }
1249
1250 /* This function is a "bottom half" handler that is called by the
1251 * mid level when a command is completed (or has failed). */
1252 static void
1253 sg_cmd_done(void *data, char *sense, int result, int resid)
1254 {
1255 Sg_request *srp = data;
1256 Sg_device *sdp = NULL;
1257 Sg_fd *sfp;
1258 unsigned long iflags;
1259 unsigned int ms;
1260
1261 if (NULL == srp) {
1262 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1263 return;
1264 }
1265 sfp = srp->parentfp;
1266 if (sfp)
1267 sdp = sfp->parentdp;
1268 if ((NULL == sdp) || sdp->detached) {
1269 printk(KERN_INFO "sg_cmd_done: device detached\n");
1270 return;
1271 }
1272
1273
1274 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1275 sdp->disk->disk_name, srp->header.pack_id, result));
1276 srp->header.resid = resid;
1277 ms = jiffies_to_msecs(jiffies);
1278 srp->header.duration = (ms > srp->header.duration) ?
1279 (ms - srp->header.duration) : 0;
1280 if (0 != result) {
1281 struct scsi_sense_hdr sshdr;
1282
1283 memcpy(srp->sense_b, sense, sizeof (srp->sense_b));
1284 srp->header.status = 0xff & result;
1285 srp->header.masked_status = status_byte(result);
1286 srp->header.msg_status = msg_byte(result);
1287 srp->header.host_status = host_byte(result);
1288 srp->header.driver_status = driver_byte(result);
1289 if ((sdp->sgdebug > 0) &&
1290 ((CHECK_CONDITION == srp->header.masked_status) ||
1291 (COMMAND_TERMINATED == srp->header.masked_status)))
1292 __scsi_print_sense("sg_cmd_done", sense,
1293 SCSI_SENSE_BUFFERSIZE);
1294
1295 /* Following if statement is a patch supplied by Eric Youngdale */
1296 if (driver_byte(result) != 0
1297 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1298 && !scsi_sense_is_deferred(&sshdr)
1299 && sshdr.sense_key == UNIT_ATTENTION
1300 && sdp->device->removable) {
1301 /* Detected possible disc change. Set the bit - this */
1302 /* may be used if there are filesystems using this device */
1303 sdp->device->changed = 1;
1304 }
1305 }
1306 /* Rely on write phase to clean out srp status values, so no "else" */
1307
1308 if (sfp->closed) { /* whoops this fd already released, cleanup */
1309 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1310 sg_finish_rem_req(srp);
1311 srp = NULL;
1312 if (NULL == sfp->headrp) {
1313 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1314 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1315 scsi_device_put(sdp->device);
1316 }
1317 sfp = NULL;
1318 }
1319 } else if (srp && srp->orphan) {
1320 if (sfp->keep_orphan)
1321 srp->sg_io_owned = 0;
1322 else {
1323 sg_finish_rem_req(srp);
1324 srp = NULL;
1325 }
1326 }
1327 if (sfp && srp) {
1328 /* Now wake up any sg_read() that is waiting for this packet. */
1329 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1330 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1331 srp->done = 1;
1332 wake_up_interruptible(&sfp->read_wait);
1333 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1334 }
1335 }
1336
1337 static struct file_operations sg_fops = {
1338 .owner = THIS_MODULE,
1339 .read = sg_read,
1340 .write = sg_write,
1341 .poll = sg_poll,
1342 .ioctl = sg_ioctl,
1343 #ifdef CONFIG_COMPAT
1344 .compat_ioctl = sg_compat_ioctl,
1345 #endif
1346 .open = sg_open,
1347 .mmap = sg_mmap,
1348 .release = sg_release,
1349 .fasync = sg_fasync,
1350 };
1351
1352 static struct class *sg_sysfs_class;
1353
1354 static int sg_sysfs_valid = 0;
1355
1356 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1357 {
1358 struct request_queue *q = scsidp->request_queue;
1359 Sg_device *sdp;
1360 unsigned long iflags;
1361 void *old_sg_dev_arr = NULL;
1362 int k, error;
1363
1364 sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL);
1365 if (!sdp) {
1366 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1367 return -ENOMEM;
1368 }
1369
1370 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1371 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
1372 Sg_device **tmp_da;
1373 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1374 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1375
1376 tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
1377 if (unlikely(!tmp_da))
1378 goto expand_failed;
1379
1380 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1381 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
1382 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
1383 old_sg_dev_arr = sg_dev_arr;
1384 sg_dev_arr = tmp_da;
1385 sg_dev_max = tmp_dev_max;
1386 }
1387
1388 for (k = 0; k < sg_dev_max; k++)
1389 if (!sg_dev_arr[k])
1390 break;
1391 if (unlikely(k >= SG_MAX_DEVS))
1392 goto overflow;
1393
1394 memset(sdp, 0, sizeof(*sdp));
1395 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1396 sprintf(disk->disk_name, "sg%d", k);
1397 disk->first_minor = k;
1398 sdp->disk = disk;
1399 sdp->device = scsidp;
1400 init_waitqueue_head(&sdp->o_excl_wait);
1401 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
1402
1403 sg_nr_dev++;
1404 sg_dev_arr[k] = sdp;
1405 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1406 error = k;
1407
1408 out:
1409 if (error < 0)
1410 kfree(sdp);
1411 kfree(old_sg_dev_arr);
1412 return error;
1413
1414 expand_failed:
1415 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
1416 error = -ENOMEM;
1417 goto out;
1418
1419 overflow:
1420 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1421 sdev_printk(KERN_WARNING, scsidp,
1422 "Unable to attach sg device type=%d, minor "
1423 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1424 error = -ENODEV;
1425 goto out;
1426 }
1427
1428 static int
1429 sg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
1430 {
1431 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1432 struct gendisk *disk;
1433 Sg_device *sdp = NULL;
1434 struct cdev * cdev = NULL;
1435 int error, k;
1436
1437 disk = alloc_disk(1);
1438 if (!disk) {
1439 printk(KERN_WARNING "alloc_disk failed\n");
1440 return -ENOMEM;
1441 }
1442 disk->major = SCSI_GENERIC_MAJOR;
1443
1444 error = -ENOMEM;
1445 cdev = cdev_alloc();
1446 if (!cdev) {
1447 printk(KERN_WARNING "cdev_alloc failed\n");
1448 goto out;
1449 }
1450 cdev->owner = THIS_MODULE;
1451 cdev->ops = &sg_fops;
1452
1453 error = sg_alloc(disk, scsidp);
1454 if (error < 0) {
1455 printk(KERN_WARNING "sg_alloc failed\n");
1456 goto out;
1457 }
1458 k = error;
1459 sdp = sg_dev_arr[k];
1460
1461 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
1462 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1463 "%s/generic", scsidp->devfs_name);
1464 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1465 if (error) {
1466 devfs_remove("%s/generic", scsidp->devfs_name);
1467 goto out;
1468 }
1469 sdp->cdev = cdev;
1470 if (sg_sysfs_valid) {
1471 struct class_device * sg_class_member;
1472
1473 sg_class_member = class_device_create(sg_sysfs_class, NULL,
1474 MKDEV(SCSI_GENERIC_MAJOR, k),
1475 cl_dev->dev, "%s",
1476 disk->disk_name);
1477 if (IS_ERR(sg_class_member))
1478 printk(KERN_WARNING "sg_add: "
1479 "class_device_create failed\n");
1480 class_set_devdata(sg_class_member, sdp);
1481 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1482 &sg_class_member->kobj, "generic");
1483 if (error)
1484 printk(KERN_ERR "sg_add: unable to make symlink "
1485 "'generic' back to sg%d\n", k);
1486 } else
1487 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1488
1489 sdev_printk(KERN_NOTICE, scsidp,
1490 "Attached scsi generic sg%d type %d\n", k,scsidp->type);
1491
1492 return 0;
1493
1494 out:
1495 put_disk(disk);
1496 if (cdev)
1497 cdev_del(cdev);
1498 return error;
1499 }
1500
1501 static void
1502 sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
1503 {
1504 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1505 Sg_device *sdp = NULL;
1506 unsigned long iflags;
1507 Sg_fd *sfp;
1508 Sg_fd *tsfp;
1509 Sg_request *srp;
1510 Sg_request *tsrp;
1511 int k, delay;
1512
1513 if (NULL == sg_dev_arr)
1514 return;
1515 delay = 0;
1516 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1517 for (k = 0; k < sg_dev_max; k++) {
1518 sdp = sg_dev_arr[k];
1519 if ((NULL == sdp) || (sdp->device != scsidp))
1520 continue; /* dirty but lowers nesting */
1521 if (sdp->headfp) {
1522 sdp->detached = 1;
1523 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1524 tsfp = sfp->nextfp;
1525 for (srp = sfp->headrp; srp; srp = tsrp) {
1526 tsrp = srp->nextrp;
1527 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1528 sg_finish_rem_req(srp);
1529 }
1530 if (sfp->closed) {
1531 scsi_device_put(sdp->device);
1532 __sg_remove_sfp(sdp, sfp);
1533 } else {
1534 delay = 1;
1535 wake_up_interruptible(&sfp->read_wait);
1536 kill_fasync(&sfp->async_qp, SIGPOLL,
1537 POLL_HUP);
1538 }
1539 }
1540 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1541 if (NULL == sdp->headfp) {
1542 sg_dev_arr[k] = NULL;
1543 }
1544 } else { /* nothing active, simple case */
1545 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1546 sg_dev_arr[k] = NULL;
1547 }
1548 sg_nr_dev--;
1549 break;
1550 }
1551 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1552
1553 if (sdp) {
1554 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1555 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k));
1556 cdev_del(sdp->cdev);
1557 sdp->cdev = NULL;
1558 devfs_remove("%s/generic", scsidp->devfs_name);
1559 put_disk(sdp->disk);
1560 sdp->disk = NULL;
1561 if (NULL == sdp->headfp)
1562 kfree((char *) sdp);
1563 }
1564
1565 if (delay)
1566 msleep(10); /* dirty detach so delay device destruction */
1567 }
1568
1569 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1570 * of sysfs parameters (which module_param doesn't yet support).
1571 * Sysfs parameters defined explicitly below.
1572 */
1573 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO);
1574 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1575
1576 MODULE_AUTHOR("Douglas Gilbert");
1577 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1578 MODULE_LICENSE("GPL");
1579 MODULE_VERSION(SG_VERSION_STR);
1580
1581 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1582 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1583
1584 static int __init
1585 init_sg(void)
1586 {
1587 int rc;
1588
1589 if (def_reserved_size >= 0)
1590 sg_big_buff = def_reserved_size;
1591
1592 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1593 SG_MAX_DEVS, "sg");
1594 if (rc)
1595 return rc;
1596 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1597 if ( IS_ERR(sg_sysfs_class) ) {
1598 rc = PTR_ERR(sg_sysfs_class);
1599 goto err_out;
1600 }
1601 sg_sysfs_valid = 1;
1602 rc = scsi_register_interface(&sg_interface);
1603 if (0 == rc) {
1604 #ifdef CONFIG_SCSI_PROC_FS
1605 sg_proc_init();
1606 #endif /* CONFIG_SCSI_PROC_FS */
1607 return 0;
1608 }
1609 class_destroy(sg_sysfs_class);
1610 err_out:
1611 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1612 return rc;
1613 }
1614
1615 static void __exit
1616 exit_sg(void)
1617 {
1618 #ifdef CONFIG_SCSI_PROC_FS
1619 sg_proc_cleanup();
1620 #endif /* CONFIG_SCSI_PROC_FS */
1621 scsi_unregister_interface(&sg_interface);
1622 class_destroy(sg_sysfs_class);
1623 sg_sysfs_valid = 0;
1624 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1625 SG_MAX_DEVS);
1626 kfree((char *)sg_dev_arr);
1627 sg_dev_arr = NULL;
1628 sg_dev_max = 0;
1629 }
1630
1631 static int
1632 sg_start_req(Sg_request * srp)
1633 {
1634 int res;
1635 Sg_fd *sfp = srp->parentfp;
1636 sg_io_hdr_t *hp = &srp->header;
1637 int dxfer_len = (int) hp->dxfer_len;
1638 int dxfer_dir = hp->dxfer_direction;
1639 Sg_scatter_hold *req_schp = &srp->data;
1640 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1641
1642 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1643 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1644 return 0;
1645 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1646 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1647 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1648 res = sg_build_direct(srp, sfp, dxfer_len);
1649 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1650 return res;
1651 }
1652 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1653 sg_link_reserve(sfp, srp, dxfer_len);
1654 else {
1655 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1656 if (res) {
1657 sg_remove_scat(req_schp);
1658 return res;
1659 }
1660 }
1661 return 0;
1662 }
1663
1664 static void
1665 sg_finish_rem_req(Sg_request * srp)
1666 {
1667 Sg_fd *sfp = srp->parentfp;
1668 Sg_scatter_hold *req_schp = &srp->data;
1669
1670 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1671 if (srp->res_used)
1672 sg_unlink_reserve(sfp, srp);
1673 else
1674 sg_remove_scat(req_schp);
1675 sg_remove_request(sfp, srp);
1676 }
1677
1678 static int
1679 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1680 {
1681 int sg_bufflen = tablesize * sizeof(struct scatterlist);
1682 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1683
1684 /*
1685 * TODO: test without low_dma, we should not need it since
1686 * the block layer will bounce the buffer for us
1687 *
1688 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
1689 */
1690 if (sfp->low_dma)
1691 gfp_flags |= GFP_DMA;
1692 schp->buffer = kzalloc(sg_bufflen, gfp_flags);
1693 if (!schp->buffer)
1694 return -ENOMEM;
1695 schp->sglist_len = sg_bufflen;
1696 return tablesize; /* number of scat_gath elements allocated */
1697 }
1698
1699 #ifdef SG_ALLOW_DIO_CODE
1700 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1701 /* TODO: hopefully we can use the generic block layer code */
1702
1703 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1704 - mapping of all pages not successful
1705 (i.e., either completely successful or fails)
1706 */
1707 static int
1708 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1709 unsigned long uaddr, size_t count, int rw)
1710 {
1711 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1712 unsigned long start = uaddr >> PAGE_SHIFT;
1713 const int nr_pages = end - start;
1714 int res, i, j;
1715 struct page **pages;
1716
1717 /* User attempted Overflow! */
1718 if ((uaddr + count) < uaddr)
1719 return -EINVAL;
1720
1721 /* Too big */
1722 if (nr_pages > max_pages)
1723 return -ENOMEM;
1724
1725 /* Hmm? */
1726 if (count == 0)
1727 return 0;
1728
1729 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1730 return -ENOMEM;
1731
1732 /* Try to fault in all of the necessary pages */
1733 down_read(&current->mm->mmap_sem);
1734 /* rw==READ means read from drive, write into memory area */
1735 res = get_user_pages(
1736 current,
1737 current->mm,
1738 uaddr,
1739 nr_pages,
1740 rw == READ,
1741 0, /* don't force */
1742 pages,
1743 NULL);
1744 up_read(&current->mm->mmap_sem);
1745
1746 /* Errors and no page mapped should return here */
1747 if (res < nr_pages)
1748 goto out_unmap;
1749
1750 for (i=0; i < nr_pages; i++) {
1751 /* FIXME: flush superflous for rw==READ,
1752 * probably wrong function for rw==WRITE
1753 */
1754 flush_dcache_page(pages[i]);
1755 /* ?? Is locking needed? I don't think so */
1756 /* if (TestSetPageLocked(pages[i]))
1757 goto out_unlock; */
1758 }
1759
1760 sgl[0].page = pages[0];
1761 sgl[0].offset = uaddr & ~PAGE_MASK;
1762 if (nr_pages > 1) {
1763 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1764 count -= sgl[0].length;
1765 for (i=1; i < nr_pages ; i++) {
1766 sgl[i].page = pages[i];
1767 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1768 count -= PAGE_SIZE;
1769 }
1770 }
1771 else {
1772 sgl[0].length = count;
1773 }
1774
1775 kfree(pages);
1776 return nr_pages;
1777
1778 out_unmap:
1779 if (res > 0) {
1780 for (j=0; j < res; j++)
1781 page_cache_release(pages[j]);
1782 res = 0;
1783 }
1784 kfree(pages);
1785 return res;
1786 }
1787
1788
1789 /* And unmap them... */
1790 static int
1791 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1792 int dirtied)
1793 {
1794 int i;
1795
1796 for (i=0; i < nr_pages; i++) {
1797 struct page *page = sgl[i].page;
1798
1799 if (dirtied)
1800 SetPageDirty(page);
1801 /* unlock_page(page); */
1802 /* FIXME: cache flush missing for rw==READ
1803 * FIXME: call the correct reference counting function
1804 */
1805 page_cache_release(page);
1806 }
1807
1808 return 0;
1809 }
1810
1811 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1812 #endif
1813
1814
1815 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1816 static int
1817 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1818 {
1819 #ifdef SG_ALLOW_DIO_CODE
1820 sg_io_hdr_t *hp = &srp->header;
1821 Sg_scatter_hold *schp = &srp->data;
1822 int sg_tablesize = sfp->parentdp->sg_tablesize;
1823 int mx_sc_elems, res;
1824 struct scsi_device *sdev = sfp->parentdp->device;
1825
1826 if (((unsigned long)hp->dxferp &
1827 queue_dma_alignment(sdev->request_queue)) != 0)
1828 return 1;
1829
1830 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1831 if (mx_sc_elems <= 0) {
1832 return 1;
1833 }
1834 res = st_map_user_pages(schp->buffer, mx_sc_elems,
1835 (unsigned long)hp->dxferp, dxfer_len,
1836 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0);
1837 if (res <= 0)
1838 return 1;
1839 schp->k_use_sg = res;
1840 schp->dio_in_use = 1;
1841 hp->info |= SG_INFO_DIRECT_IO;
1842 return 0;
1843 #else
1844 return 1;
1845 #endif
1846 }
1847
1848 static int
1849 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1850 {
1851 struct scatterlist *sg;
1852 int ret_sz = 0, k, rem_sz, num, mx_sc_elems;
1853 int sg_tablesize = sfp->parentdp->sg_tablesize;
1854 int blk_size = buff_size;
1855 struct page *p = NULL;
1856
1857 if ((blk_size < 0) || (!sfp))
1858 return -EFAULT;
1859 if (0 == blk_size)
1860 ++blk_size; /* don't know why */
1861 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1862 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1863 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1864 buff_size, blk_size));
1865
1866 /* N.B. ret_sz carried into this block ... */
1867 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1868 if (mx_sc_elems < 0)
1869 return mx_sc_elems; /* most likely -ENOMEM */
1870
1871 for (k = 0, sg = schp->buffer, rem_sz = blk_size;
1872 (rem_sz > 0) && (k < mx_sc_elems);
1873 ++k, rem_sz -= ret_sz, ++sg) {
1874
1875 num = (rem_sz > SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1876 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1877 if (!p)
1878 return -ENOMEM;
1879
1880 sg->page = p;
1881 sg->length = ret_sz;
1882
1883 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1884 k, p, ret_sz));
1885 } /* end of for loop */
1886
1887 schp->k_use_sg = k;
1888 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1889
1890 schp->bufflen = blk_size;
1891 if (rem_sz > 0) /* must have failed */
1892 return -ENOMEM;
1893
1894 return 0;
1895 }
1896
1897 static int
1898 sg_write_xfer(Sg_request * srp)
1899 {
1900 sg_io_hdr_t *hp = &srp->header;
1901 Sg_scatter_hold *schp = &srp->data;
1902 struct scatterlist *sg = schp->buffer;
1903 int num_xfer = 0;
1904 int j, k, onum, usglen, ksglen, res;
1905 int iovec_count = (int) hp->iovec_count;
1906 int dxfer_dir = hp->dxfer_direction;
1907 unsigned char *p;
1908 unsigned char __user *up;
1909 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1910
1911 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1912 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1913 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1914 if (schp->bufflen < num_xfer)
1915 num_xfer = schp->bufflen;
1916 }
1917 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1918 (new_interface
1919 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1920 return 0;
1921
1922 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1923 num_xfer, iovec_count, schp->k_use_sg));
1924 if (iovec_count) {
1925 onum = iovec_count;
1926 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
1927 return -EFAULT;
1928 } else
1929 onum = 1;
1930
1931 ksglen = sg->length;
1932 p = page_address(sg->page);
1933 for (j = 0, k = 0; j < onum; ++j) {
1934 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1935 if (res)
1936 return res;
1937
1938 for (; p; ++sg, ksglen = sg->length,
1939 p = page_address(sg->page)) {
1940 if (usglen <= 0)
1941 break;
1942 if (ksglen > usglen) {
1943 if (usglen >= num_xfer) {
1944 if (__copy_from_user(p, up, num_xfer))
1945 return -EFAULT;
1946 return 0;
1947 }
1948 if (__copy_from_user(p, up, usglen))
1949 return -EFAULT;
1950 p += usglen;
1951 ksglen -= usglen;
1952 break;
1953 } else {
1954 if (ksglen >= num_xfer) {
1955 if (__copy_from_user(p, up, num_xfer))
1956 return -EFAULT;
1957 return 0;
1958 }
1959 if (__copy_from_user(p, up, ksglen))
1960 return -EFAULT;
1961 up += ksglen;
1962 usglen -= ksglen;
1963 }
1964 ++k;
1965 if (k >= schp->k_use_sg)
1966 return 0;
1967 }
1968 }
1969
1970 return 0;
1971 }
1972
1973 static int
1974 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
1975 int wr_xf, int *countp, unsigned char __user **up)
1976 {
1977 int num_xfer = (int) hp->dxfer_len;
1978 unsigned char __user *p = hp->dxferp;
1979 int count;
1980
1981 if (0 == sg_num) {
1982 if (wr_xf && ('\0' == hp->interface_id))
1983 count = (int) hp->flags; /* holds "old" input_size */
1984 else
1985 count = num_xfer;
1986 } else {
1987 sg_iovec_t iovec;
1988 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
1989 return -EFAULT;
1990 p = iovec.iov_base;
1991 count = (int) iovec.iov_len;
1992 }
1993 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
1994 return -EFAULT;
1995 if (up)
1996 *up = p;
1997 if (countp)
1998 *countp = count;
1999 return 0;
2000 }
2001
2002 static void
2003 sg_remove_scat(Sg_scatter_hold * schp)
2004 {
2005 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2006 if (schp->buffer && (schp->sglist_len > 0)) {
2007 struct scatterlist *sg = schp->buffer;
2008
2009 if (schp->dio_in_use) {
2010 #ifdef SG_ALLOW_DIO_CODE
2011 st_unmap_user_pages(sg, schp->k_use_sg, TRUE);
2012 #endif
2013 } else {
2014 int k;
2015
2016 for (k = 0; (k < schp->k_use_sg) && sg->page;
2017 ++k, ++sg) {
2018 SCSI_LOG_TIMEOUT(5, printk(
2019 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2020 k, sg->page, sg->length));
2021 sg_page_free(sg->page, sg->length);
2022 }
2023 }
2024 kfree(schp->buffer);
2025 }
2026 memset(schp, 0, sizeof (*schp));
2027 }
2028
2029 static int
2030 sg_read_xfer(Sg_request * srp)
2031 {
2032 sg_io_hdr_t *hp = &srp->header;
2033 Sg_scatter_hold *schp = &srp->data;
2034 struct scatterlist *sg = schp->buffer;
2035 int num_xfer = 0;
2036 int j, k, onum, usglen, ksglen, res;
2037 int iovec_count = (int) hp->iovec_count;
2038 int dxfer_dir = hp->dxfer_direction;
2039 unsigned char *p;
2040 unsigned char __user *up;
2041 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2042
2043 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2044 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2045 num_xfer = hp->dxfer_len;
2046 if (schp->bufflen < num_xfer)
2047 num_xfer = schp->bufflen;
2048 }
2049 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2050 (new_interface
2051 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2052 return 0;
2053
2054 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2055 num_xfer, iovec_count, schp->k_use_sg));
2056 if (iovec_count) {
2057 onum = iovec_count;
2058 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2059 return -EFAULT;
2060 } else
2061 onum = 1;
2062
2063 p = page_address(sg->page);
2064 ksglen = sg->length;
2065 for (j = 0, k = 0; j < onum; ++j) {
2066 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2067 if (res)
2068 return res;
2069
2070 for (; p; ++sg, ksglen = sg->length,
2071 p = page_address(sg->page)) {
2072 if (usglen <= 0)
2073 break;
2074 if (ksglen > usglen) {
2075 if (usglen >= num_xfer) {
2076 if (__copy_to_user(up, p, num_xfer))
2077 return -EFAULT;
2078 return 0;
2079 }
2080 if (__copy_to_user(up, p, usglen))
2081 return -EFAULT;
2082 p += usglen;
2083 ksglen -= usglen;
2084 break;
2085 } else {
2086 if (ksglen >= num_xfer) {
2087 if (__copy_to_user(up, p, num_xfer))
2088 return -EFAULT;
2089 return 0;
2090 }
2091 if (__copy_to_user(up, p, ksglen))
2092 return -EFAULT;
2093 up += ksglen;
2094 usglen -= ksglen;
2095 }
2096 ++k;
2097 if (k >= schp->k_use_sg)
2098 return 0;
2099 }
2100 }
2101
2102 return 0;
2103 }
2104
2105 static int
2106 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2107 {
2108 Sg_scatter_hold *schp = &srp->data;
2109 struct scatterlist *sg = schp->buffer;
2110 int k, num;
2111
2112 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2113 num_read_xfer));
2114 if ((!outp) || (num_read_xfer <= 0))
2115 return 0;
2116
2117 for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) {
2118 num = sg->length;
2119 if (num > num_read_xfer) {
2120 if (__copy_to_user(outp, page_address(sg->page),
2121 num_read_xfer))
2122 return -EFAULT;
2123 break;
2124 } else {
2125 if (__copy_to_user(outp, page_address(sg->page),
2126 num))
2127 return -EFAULT;
2128 num_read_xfer -= num;
2129 if (num_read_xfer <= 0)
2130 break;
2131 outp += num;
2132 }
2133 }
2134
2135 return 0;
2136 }
2137
2138 static void
2139 sg_build_reserve(Sg_fd * sfp, int req_size)
2140 {
2141 Sg_scatter_hold *schp = &sfp->reserve;
2142
2143 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2144 do {
2145 if (req_size < PAGE_SIZE)
2146 req_size = PAGE_SIZE;
2147 if (0 == sg_build_indirect(schp, sfp, req_size))
2148 return;
2149 else
2150 sg_remove_scat(schp);
2151 req_size >>= 1; /* divide by 2 */
2152 } while (req_size > (PAGE_SIZE / 2));
2153 }
2154
2155 static void
2156 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2157 {
2158 Sg_scatter_hold *req_schp = &srp->data;
2159 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2160 struct scatterlist *sg = rsv_schp->buffer;
2161 int k, num, rem;
2162
2163 srp->res_used = 1;
2164 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2165 rem = size;
2166
2167 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) {
2168 num = sg->length;
2169 if (rem <= num) {
2170 sfp->save_scat_len = num;
2171 sg->length = rem;
2172 req_schp->k_use_sg = k + 1;
2173 req_schp->sglist_len = rsv_schp->sglist_len;
2174 req_schp->buffer = rsv_schp->buffer;
2175
2176 req_schp->bufflen = size;
2177 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2178 break;
2179 } else
2180 rem -= num;
2181 }
2182
2183 if (k >= rsv_schp->k_use_sg)
2184 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2185 }
2186
2187 static void
2188 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2189 {
2190 Sg_scatter_hold *req_schp = &srp->data;
2191 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2192
2193 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2194 (int) req_schp->k_use_sg));
2195 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2196 struct scatterlist *sg = rsv_schp->buffer;
2197
2198 if (sfp->save_scat_len > 0)
2199 (sg + (req_schp->k_use_sg - 1))->length =
2200 (unsigned) sfp->save_scat_len;
2201 else
2202 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2203 }
2204 req_schp->k_use_sg = 0;
2205 req_schp->bufflen = 0;
2206 req_schp->buffer = NULL;
2207 req_schp->sglist_len = 0;
2208 sfp->save_scat_len = 0;
2209 srp->res_used = 0;
2210 }
2211
2212 static Sg_request *
2213 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2214 {
2215 Sg_request *resp;
2216 unsigned long iflags;
2217
2218 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2219 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2220 /* look for requests that are ready + not SG_IO owned */
2221 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2222 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2223 resp->done = 2; /* guard against other readers */
2224 break;
2225 }
2226 }
2227 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2228 return resp;
2229 }
2230
2231 #ifdef CONFIG_SCSI_PROC_FS
2232 static Sg_request *
2233 sg_get_nth_request(Sg_fd * sfp, int nth)
2234 {
2235 Sg_request *resp;
2236 unsigned long iflags;
2237 int k;
2238
2239 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2240 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2241 ++k, resp = resp->nextrp) ;
2242 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2243 return resp;
2244 }
2245 #endif
2246
2247 /* always adds to end of list */
2248 static Sg_request *
2249 sg_add_request(Sg_fd * sfp)
2250 {
2251 int k;
2252 unsigned long iflags;
2253 Sg_request *resp;
2254 Sg_request *rp = sfp->req_arr;
2255
2256 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2257 resp = sfp->headrp;
2258 if (!resp) {
2259 memset(rp, 0, sizeof (Sg_request));
2260 rp->parentfp = sfp;
2261 resp = rp;
2262 sfp->headrp = resp;
2263 } else {
2264 if (0 == sfp->cmd_q)
2265 resp = NULL; /* command queuing disallowed */
2266 else {
2267 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2268 if (!rp->parentfp)
2269 break;
2270 }
2271 if (k < SG_MAX_QUEUE) {
2272 memset(rp, 0, sizeof (Sg_request));
2273 rp->parentfp = sfp;
2274 while (resp->nextrp)
2275 resp = resp->nextrp;
2276 resp->nextrp = rp;
2277 resp = rp;
2278 } else
2279 resp = NULL;
2280 }
2281 }
2282 if (resp) {
2283 resp->nextrp = NULL;
2284 resp->header.duration = jiffies_to_msecs(jiffies);
2285 }
2286 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2287 return resp;
2288 }
2289
2290 /* Return of 1 for found; 0 for not found */
2291 static int
2292 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2293 {
2294 Sg_request *prev_rp;
2295 Sg_request *rp;
2296 unsigned long iflags;
2297 int res = 0;
2298
2299 if ((!sfp) || (!srp) || (!sfp->headrp))
2300 return res;
2301 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2302 prev_rp = sfp->headrp;
2303 if (srp == prev_rp) {
2304 sfp->headrp = prev_rp->nextrp;
2305 prev_rp->parentfp = NULL;
2306 res = 1;
2307 } else {
2308 while ((rp = prev_rp->nextrp)) {
2309 if (srp == rp) {
2310 prev_rp->nextrp = rp->nextrp;
2311 rp->parentfp = NULL;
2312 res = 1;
2313 break;
2314 }
2315 prev_rp = rp;
2316 }
2317 }
2318 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2319 return res;
2320 }
2321
2322 #ifdef CONFIG_SCSI_PROC_FS
2323 static Sg_fd *
2324 sg_get_nth_sfp(Sg_device * sdp, int nth)
2325 {
2326 Sg_fd *resp;
2327 unsigned long iflags;
2328 int k;
2329
2330 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2331 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2332 ++k, resp = resp->nextfp) ;
2333 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2334 return resp;
2335 }
2336 #endif
2337
2338 static Sg_fd *
2339 sg_add_sfp(Sg_device * sdp, int dev)
2340 {
2341 Sg_fd *sfp;
2342 unsigned long iflags;
2343
2344 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2345 if (!sfp)
2346 return NULL;
2347
2348 init_waitqueue_head(&sfp->read_wait);
2349 rwlock_init(&sfp->rq_list_lock);
2350
2351 sfp->timeout = SG_DEFAULT_TIMEOUT;
2352 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2353 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2354 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2355 sdp->device->host->unchecked_isa_dma : 1;
2356 sfp->cmd_q = SG_DEF_COMMAND_Q;
2357 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2358 sfp->parentdp = sdp;
2359 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2360 if (!sdp->headfp)
2361 sdp->headfp = sfp;
2362 else { /* add to tail of existing list */
2363 Sg_fd *pfp = sdp->headfp;
2364 while (pfp->nextfp)
2365 pfp = pfp->nextfp;
2366 pfp->nextfp = sfp;
2367 }
2368 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2369 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2370 sg_build_reserve(sfp, sg_big_buff);
2371 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2372 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2373 return sfp;
2374 }
2375
2376 static void
2377 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2378 {
2379 Sg_fd *fp;
2380 Sg_fd *prev_fp;
2381
2382 prev_fp = sdp->headfp;
2383 if (sfp == prev_fp)
2384 sdp->headfp = prev_fp->nextfp;
2385 else {
2386 while ((fp = prev_fp->nextfp)) {
2387 if (sfp == fp) {
2388 prev_fp->nextfp = fp->nextfp;
2389 break;
2390 }
2391 prev_fp = fp;
2392 }
2393 }
2394 if (sfp->reserve.bufflen > 0) {
2395 SCSI_LOG_TIMEOUT(6,
2396 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2397 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2398 if (sfp->mmap_called)
2399 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
2400 sg_remove_scat(&sfp->reserve);
2401 }
2402 sfp->parentdp = NULL;
2403 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2404 kfree(sfp);
2405 }
2406
2407 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2408 static int
2409 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2410 {
2411 Sg_request *srp;
2412 Sg_request *tsrp;
2413 int dirty = 0;
2414 int res = 0;
2415
2416 for (srp = sfp->headrp; srp; srp = tsrp) {
2417 tsrp = srp->nextrp;
2418 if (sg_srp_done(srp, sfp))
2419 sg_finish_rem_req(srp);
2420 else
2421 ++dirty;
2422 }
2423 if (0 == dirty) {
2424 unsigned long iflags;
2425
2426 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2427 __sg_remove_sfp(sdp, sfp);
2428 if (sdp->detached && (NULL == sdp->headfp)) {
2429 int k, maxd;
2430
2431 maxd = sg_dev_max;
2432 for (k = 0; k < maxd; ++k) {
2433 if (sdp == sg_dev_arr[k])
2434 break;
2435 }
2436 if (k < maxd)
2437 sg_dev_arr[k] = NULL;
2438 kfree((char *) sdp);
2439 res = 1;
2440 }
2441 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2442 } else {
2443 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2444 /* only bump the access_count if we actually succeeded in
2445 * throwing another counter on the host module */
2446 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2447 sfp->closed = 1; /* flag dirty state on this fd */
2448 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2449 dirty));
2450 }
2451 return res;
2452 }
2453
2454 static int
2455 sg_res_in_use(Sg_fd * sfp)
2456 {
2457 const Sg_request *srp;
2458 unsigned long iflags;
2459
2460 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2461 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2462 if (srp->res_used)
2463 break;
2464 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2465 return srp ? 1 : 0;
2466 }
2467
2468 /* If retSzp==NULL want exact size or fail */
2469 static struct page *
2470 sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2471 {
2472 struct page *resp = NULL;
2473 gfp_t page_mask;
2474 int order, a_size;
2475 int resSz = rqSz;
2476
2477 if (rqSz <= 0)
2478 return resp;
2479
2480 if (lowDma)
2481 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
2482 else
2483 page_mask = GFP_ATOMIC | __GFP_NOWARN;
2484
2485 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2486 order++, a_size <<= 1) ;
2487 resp = alloc_pages(page_mask, order);
2488 while ((!resp) && order && retSzp) {
2489 --order;
2490 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2491 resp = alloc_pages(page_mask, order); /* try half */
2492 resSz = a_size;
2493 }
2494 if (resp) {
2495 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2496 memset(page_address(resp), 0, resSz);
2497 if (retSzp)
2498 *retSzp = resSz;
2499 }
2500 return resp;
2501 }
2502
2503 static void
2504 sg_page_free(struct page *page, int size)
2505 {
2506 int order, a_size;
2507
2508 if (!page)
2509 return;
2510 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2511 order++, a_size <<= 1) ;
2512 __free_pages(page, order);
2513 }
2514
2515 #ifndef MAINTENANCE_IN_CMD
2516 #define MAINTENANCE_IN_CMD 0xa3
2517 #endif
2518
2519 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2520 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2521 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
2522 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
2523 };
2524
2525 static int
2526 sg_allow_access(unsigned char opcode, char dev_type)
2527 {
2528 int k;
2529
2530 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2531 return 1;
2532 for (k = 0; k < sizeof (allow_ops); ++k) {
2533 if (opcode == allow_ops[k])
2534 return 1;
2535 }
2536 return 0;
2537 }
2538
2539 #ifdef CONFIG_SCSI_PROC_FS
2540 static int
2541 sg_last_dev(void)
2542 {
2543 int k;
2544 unsigned long iflags;
2545
2546 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2547 for (k = sg_dev_max - 1; k >= 0; --k)
2548 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2549 break;
2550 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2551 return k + 1; /* origin 1 */
2552 }
2553 #endif
2554
2555 static Sg_device *
2556 sg_get_dev(int dev)
2557 {
2558 Sg_device *sdp = NULL;
2559 unsigned long iflags;
2560
2561 if (sg_dev_arr && (dev >= 0)) {
2562 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2563 if (dev < sg_dev_max)
2564 sdp = sg_dev_arr[dev];
2565 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2566 }
2567 return sdp;
2568 }
2569
2570 #ifdef CONFIG_SCSI_PROC_FS
2571
2572 static struct proc_dir_entry *sg_proc_sgp = NULL;
2573
2574 static char sg_proc_sg_dirname[] = "scsi/sg";
2575
2576 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2577
2578 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2579 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2580 size_t count, loff_t *off);
2581 static struct file_operations adio_fops = {
2582 /* .owner, .read and .llseek added in sg_proc_init() */
2583 .open = sg_proc_single_open_adio,
2584 .write = sg_proc_write_adio,
2585 .release = single_release,
2586 };
2587
2588 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2589 static ssize_t sg_proc_write_dressz(struct file *filp,
2590 const char __user *buffer, size_t count, loff_t *off);
2591 static struct file_operations dressz_fops = {
2592 .open = sg_proc_single_open_dressz,
2593 .write = sg_proc_write_dressz,
2594 .release = single_release,
2595 };
2596
2597 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2598 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2599 static struct file_operations version_fops = {
2600 .open = sg_proc_single_open_version,
2601 .release = single_release,
2602 };
2603
2604 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2605 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2606 static struct file_operations devhdr_fops = {
2607 .open = sg_proc_single_open_devhdr,
2608 .release = single_release,
2609 };
2610
2611 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2612 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2613 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2614 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2615 static void dev_seq_stop(struct seq_file *s, void *v);
2616 static struct file_operations dev_fops = {
2617 .open = sg_proc_open_dev,
2618 .release = seq_release,
2619 };
2620 static struct seq_operations dev_seq_ops = {
2621 .start = dev_seq_start,
2622 .next = dev_seq_next,
2623 .stop = dev_seq_stop,
2624 .show = sg_proc_seq_show_dev,
2625 };
2626
2627 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2628 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2629 static struct file_operations devstrs_fops = {
2630 .open = sg_proc_open_devstrs,
2631 .release = seq_release,
2632 };
2633 static struct seq_operations devstrs_seq_ops = {
2634 .start = dev_seq_start,
2635 .next = dev_seq_next,
2636 .stop = dev_seq_stop,
2637 .show = sg_proc_seq_show_devstrs,
2638 };
2639
2640 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2641 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2642 static struct file_operations debug_fops = {
2643 .open = sg_proc_open_debug,
2644 .release = seq_release,
2645 };
2646 static struct seq_operations debug_seq_ops = {
2647 .start = dev_seq_start,
2648 .next = dev_seq_next,
2649 .stop = dev_seq_stop,
2650 .show = sg_proc_seq_show_debug,
2651 };
2652
2653
2654 struct sg_proc_leaf {
2655 const char * name;
2656 struct file_operations * fops;
2657 };
2658
2659 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2660 {"allow_dio", &adio_fops},
2661 {"debug", &debug_fops},
2662 {"def_reserved_size", &dressz_fops},
2663 {"device_hdr", &devhdr_fops},
2664 {"devices", &dev_fops},
2665 {"device_strs", &devstrs_fops},
2666 {"version", &version_fops}
2667 };
2668
2669 static int
2670 sg_proc_init(void)
2671 {
2672 int k, mask;
2673 int num_leaves =
2674 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2675 struct proc_dir_entry *pdep;
2676 struct sg_proc_leaf * leaf;
2677
2678 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2679 if (!sg_proc_sgp)
2680 return 1;
2681 for (k = 0; k < num_leaves; ++k) {
2682 leaf = &sg_proc_leaf_arr[k];
2683 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2684 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2685 if (pdep) {
2686 leaf->fops->owner = THIS_MODULE,
2687 leaf->fops->read = seq_read,
2688 leaf->fops->llseek = seq_lseek,
2689 pdep->proc_fops = leaf->fops;
2690 }
2691 }
2692 return 0;
2693 }
2694
2695 static void
2696 sg_proc_cleanup(void)
2697 {
2698 int k;
2699 int num_leaves =
2700 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2701
2702 if (!sg_proc_sgp)
2703 return;
2704 for (k = 0; k < num_leaves; ++k)
2705 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2706 remove_proc_entry(sg_proc_sg_dirname, NULL);
2707 }
2708
2709
2710 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2711 {
2712 seq_printf(s, "%d\n", *((int *)s->private));
2713 return 0;
2714 }
2715
2716 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2717 {
2718 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2719 }
2720
2721 static ssize_t
2722 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2723 size_t count, loff_t *off)
2724 {
2725 int num;
2726 char buff[11];
2727
2728 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2729 return -EACCES;
2730 num = (count < 10) ? count : 10;
2731 if (copy_from_user(buff, buffer, num))
2732 return -EFAULT;
2733 buff[num] = '\0';
2734 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2735 return count;
2736 }
2737
2738 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2739 {
2740 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2741 }
2742
2743 static ssize_t
2744 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2745 size_t count, loff_t *off)
2746 {
2747 int num;
2748 unsigned long k = ULONG_MAX;
2749 char buff[11];
2750
2751 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2752 return -EACCES;
2753 num = (count < 10) ? count : 10;
2754 if (copy_from_user(buff, buffer, num))
2755 return -EFAULT;
2756 buff[num] = '\0';
2757 k = simple_strtoul(buff, NULL, 10);
2758 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2759 sg_big_buff = k;
2760 return count;
2761 }
2762 return -ERANGE;
2763 }
2764
2765 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2766 {
2767 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2768 sg_version_date);
2769 return 0;
2770 }
2771
2772 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2773 {
2774 return single_open(file, sg_proc_seq_show_version, NULL);
2775 }
2776
2777 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2778 {
2779 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2780 "online\n");
2781 return 0;
2782 }
2783
2784 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2785 {
2786 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2787 }
2788
2789 struct sg_proc_deviter {
2790 loff_t index;
2791 size_t max;
2792 };
2793
2794 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2795 {
2796 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2797
2798 s->private = it;
2799 if (! it)
2800 return NULL;
2801
2802 if (NULL == sg_dev_arr)
2803 return NULL;
2804 it->index = *pos;
2805 it->max = sg_last_dev();
2806 if (it->index >= it->max)
2807 return NULL;
2808 return it;
2809 }
2810
2811 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2812 {
2813 struct sg_proc_deviter * it = s->private;
2814
2815 *pos = ++it->index;
2816 return (it->index < it->max) ? it : NULL;
2817 }
2818
2819 static void dev_seq_stop(struct seq_file *s, void *v)
2820 {
2821 kfree(s->private);
2822 }
2823
2824 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2825 {
2826 return seq_open(file, &dev_seq_ops);
2827 }
2828
2829 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2830 {
2831 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2832 Sg_device *sdp;
2833 struct scsi_device *scsidp;
2834
2835 sdp = it ? sg_get_dev(it->index) : NULL;
2836 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2837 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2838 scsidp->host->host_no, scsidp->channel,
2839 scsidp->id, scsidp->lun, (int) scsidp->type,
2840 1,
2841 (int) scsidp->queue_depth,
2842 (int) scsidp->device_busy,
2843 (int) scsi_device_online(scsidp));
2844 else
2845 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2846 return 0;
2847 }
2848
2849 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2850 {
2851 return seq_open(file, &devstrs_seq_ops);
2852 }
2853
2854 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2855 {
2856 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2857 Sg_device *sdp;
2858 struct scsi_device *scsidp;
2859
2860 sdp = it ? sg_get_dev(it->index) : NULL;
2861 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2862 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2863 scsidp->vendor, scsidp->model, scsidp->rev);
2864 else
2865 seq_printf(s, "<no active device>\n");
2866 return 0;
2867 }
2868
2869 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2870 {
2871 int k, m, new_interface, blen, usg;
2872 Sg_request *srp;
2873 Sg_fd *fp;
2874 const sg_io_hdr_t *hp;
2875 const char * cp;
2876 unsigned int ms;
2877
2878 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2879 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2880 "(res)sgat=%d low_dma=%d\n", k + 1,
2881 jiffies_to_msecs(fp->timeout),
2882 fp->reserve.bufflen,
2883 (int) fp->reserve.k_use_sg,
2884 (int) fp->low_dma);
2885 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2886 (int) fp->cmd_q, (int) fp->force_packid,
2887 (int) fp->keep_orphan, (int) fp->closed);
2888 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2889 hp = &srp->header;
2890 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2891 if (srp->res_used) {
2892 if (new_interface &&
2893 (SG_FLAG_MMAP_IO & hp->flags))
2894 cp = " mmap>> ";
2895 else
2896 cp = " rb>> ";
2897 } else {
2898 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2899 cp = " dio>> ";
2900 else
2901 cp = " ";
2902 }
2903 seq_printf(s, cp);
2904 blen = srp->data.bufflen;
2905 usg = srp->data.k_use_sg;
2906 seq_printf(s, srp->done ?
2907 ((1 == srp->done) ? "rcv:" : "fin:")
2908 : "act:");
2909 seq_printf(s, " id=%d blen=%d",
2910 srp->header.pack_id, blen);
2911 if (srp->done)
2912 seq_printf(s, " dur=%d", hp->duration);
2913 else {
2914 ms = jiffies_to_msecs(jiffies);
2915 seq_printf(s, " t_o/elap=%d/%d",
2916 (new_interface ? hp->timeout :
2917 jiffies_to_msecs(fp->timeout)),
2918 (ms > hp->duration ? ms - hp->duration : 0));
2919 }
2920 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2921 (int) srp->data.cmd_opcode);
2922 }
2923 if (0 == m)
2924 seq_printf(s, " No requests active\n");
2925 }
2926 }
2927
2928 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2929 {
2930 return seq_open(file, &debug_seq_ops);
2931 }
2932
2933 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2934 {
2935 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2936 Sg_device *sdp;
2937
2938 if (it && (0 == it->index)) {
2939 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
2940 "(origin 1)\n", sg_dev_max, (int)it->max);
2941 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2942 }
2943 sdp = it ? sg_get_dev(it->index) : NULL;
2944 if (sdp) {
2945 struct scsi_device *scsidp = sdp->device;
2946
2947 if (NULL == scsidp) {
2948 seq_printf(s, "device %d detached ??\n",
2949 (int)it->index);
2950 return 0;
2951 }
2952
2953 if (sg_get_nth_sfp(sdp, 0)) {
2954 seq_printf(s, " >>> device=%s ",
2955 sdp->disk->disk_name);
2956 if (sdp->detached)
2957 seq_printf(s, "detached pending close ");
2958 else
2959 seq_printf
2960 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2961 scsidp->host->host_no,
2962 scsidp->channel, scsidp->id,
2963 scsidp->lun,
2964 scsidp->host->hostt->emulated);
2965 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2966 sdp->sg_tablesize, sdp->exclude);
2967 }
2968 sg_proc_debug_helper(s, sdp);
2969 }
2970 return 0;
2971 }
2972
2973 #endif /* CONFIG_SCSI_PROC_FS */
2974
2975 module_init(init_sg);
2976 module_exit(exit_sg);
2977 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
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