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Staging: rt2870: Revert d44ca7 Removal of kernel_thread() API
[linux.git] / drivers / scsi / sg.c
CommitLineData
1da177e4
LT		 1/*
2 * History:
3 * Started: Aug 9 by Lawrence Foard ([email protected]),
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 <[email protected]> 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
b2155d04
DG		 21static int sg_version_num = 30534; /* 2 digits for each component */
22#define SG_VERSION_STR "3.5.34"
1da177e4
LT		 23
24/*
25 * D. P. Gilbert ([email protected], [email protected]), 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 */
1da177e4
LT		 31#include <linux/module.h>
32
33#include <linux/fs.h>
34#include <linux/kernel.h>
35#include <linux/sched.h>
36#include <linux/string.h>
37#include <linux/mm.h>
38#include <linux/errno.h>
39#include <linux/mtio.h>
40#include <linux/ioctl.h>
41#include <linux/fcntl.h>
42#include <linux/init.h>
43#include <linux/poll.h>
1da177e4 44#include <linux/moduleparam.h>
1da177e4 45#include <linux/cdev.h>
7c07d613 46#include <linux/idr.h>
1da177e4
LT		 47#include <linux/seq_file.h>
48#include <linux/blkdev.h>
49#include <linux/delay.h>
6da127ad 50#include <linux/blktrace_api.h>
eb09d3d4 51#include <linux/smp_lock.h>
1da177e4
LT		 52
53#include "scsi.h"
db9dff36 54#include <scsi/scsi_dbg.h>
1da177e4
LT		 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>
7ca63cb4 64static char *sg_version_date = "20061027";
1da177e4
LT		 65
66static int sg_proc_init(void);
67static void sg_proc_cleanup(void);
68#endif
69
1da177e4 70#define SG_ALLOW_DIO_DEF 0
1da177e4
LT		 71
72#define SG_MAX_DEVS 32768
73
74/*
75 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
76 * Then when using 32 bit integers x * m may overflow during the calculation.
77 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
78 * calculates the same, but prevents the overflow when both m and d
79 * are "small" numbers (like HZ and USER_HZ).
80 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
81 * in 32 bits.
82 */
83#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
84
85#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
86
87int sg_big_buff = SG_DEF_RESERVED_SIZE;
88/* N.B. This variable is readable and writeable via
89 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
90 of this size (or less if there is not enough memory) will be reserved
91 for use by this file descriptor. [Deprecated usage: this variable is also
92 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
93 the kernel (i.e. it is not a module).] */
94static int def_reserved_size = -1; /* picks up init parameter */
95static int sg_allow_dio = SG_ALLOW_DIO_DEF;
96
6460e75a
DG		 97static int scatter_elem_sz = SG_SCATTER_SZ;
98static int scatter_elem_sz_prev = SG_SCATTER_SZ;
99
1da177e4 100#define SG_SECTOR_SZ 512
1da177e4 101
ee959b00
TJ		 102static int sg_add(struct device *, struct class_interface *);
103static void sg_remove(struct device *, struct class_interface *);
1da177e4 104
7c07d613
JB		 105static DEFINE_IDR(sg_index_idr);
106static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
1da177e4
LT		 107 file descriptor list for device */
108
109static struct class_interface sg_interface = {
ee959b00
TJ		 110 .add_dev = sg_add,
111 .remove_dev = sg_remove,
1da177e4
LT		 112};
113
114typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
115 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 116 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4 117 unsigned bufflen; /* Size of (aggregate) data buffer */
10db10d1
FT		 118 struct page **pages;
119 int page_order;
1da177e4
LT		 120 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
121 unsigned char cmd_opcode; /* first byte of command */
122} Sg_scatter_hold;
123
124struct sg_device; /* forward declarations */
125struct sg_fd;
126
127typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 128 struct sg_request *nextrp; /* NULL -> tail request (slist) */
129 struct sg_fd *parentfp; /* NULL -> not in use */
130 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
131 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 132 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 133 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
134 char orphan; /* 1 -> drop on sight, 0 -> normal */
135 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
136 volatile char done; /* 0->before bh, 1->before read, 2->read */
10865dfa 137 struct request *rq;
6e5a30cb 138 struct bio *bio;
c96952ed 139 struct execute_work ew;
1da177e4
LT		 140} Sg_request;
141
142typedef struct sg_fd { /* holds the state of a file descriptor */
3442f802 143 struct list_head sfd_siblings;
1da177e4
LT		 144 struct sg_device *parentdp; /* owning device */
145 wait_queue_head_t read_wait; /* queue read until command done */
146 rwlock_t rq_list_lock; /* protect access to list in req_arr */
147 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
148 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
149 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
150 unsigned save_scat_len; /* original length of trunc. scat. element */
151 Sg_request *headrp; /* head of request slist, NULL->empty */
152 struct fasync_struct *async_qp; /* used by asynchronous notification */
153 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
154 char low_dma; /* as in parent but possibly overridden to 1 */
155 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
156 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
157 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
158 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
159 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
160 char mmap_called; /* 0 -> mmap() never called on this fd */
c6517b79
TB		 161 struct kref f_ref;
162 struct execute_work ew;
1da177e4
LT		 163} Sg_fd;
164
165typedef struct sg_device { /* holds the state of each scsi generic device */
166 struct scsi_device *device;
167 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
168 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 169 u32 index; /* device index number */
3442f802 170 struct list_head sfds;
1da177e4
LT		 171 volatile char detached; /* 0->attached, 1->detached pending removal */
172 volatile char exclude; /* opened for exclusive access */
173 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
174 struct gendisk *disk;
175 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
c6517b79 176 struct kref d_ref;
1da177e4
LT		 177} Sg_device;
178
d6b10348 179/* tasklet or soft irq callback */
a91a3a20 180static void sg_rq_end_io(struct request *rq, int uptodate);
10865dfa 181static int sg_start_req(Sg_request *srp, unsigned char *cmd);
e7ee4cc0 182static int sg_finish_rem_req(Sg_request * srp);
1da177e4 183static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
1da177e4
LT		 184static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
185 Sg_request * srp);
0b07de85
AG		 186static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
187 const char __user *buf, size_t count, int blocking,
a2dd3b4c 188 int read_only, int sg_io_owned, Sg_request **o_srp);
1da177e4
LT		 189static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
190 unsigned char *cmnd, int timeout, int blocking);
1da177e4
LT		 191static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
192static void sg_remove_scat(Sg_scatter_hold * schp);
193static void sg_build_reserve(Sg_fd * sfp, int req_size);
194static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
195static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
1da177e4 196static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
c6517b79 197static void sg_remove_sfp(struct kref *);
1da177e4
LT		 198static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
199static Sg_request *sg_add_request(Sg_fd * sfp);
200static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
201static int sg_res_in_use(Sg_fd * sfp);
1da177e4 202static Sg_device *sg_get_dev(int dev);
c6517b79 203static void sg_put_dev(Sg_device *sdp);
1da177e4 204
1da177e4
LT		 205#define SZ_SG_HEADER sizeof(struct sg_header)
206#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
207#define SZ_SG_IOVEC sizeof(sg_iovec_t)
208#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
209
14e507b8
FT		 210static int sg_allow_access(struct file *filp, unsigned char *cmd)
211{
212 struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
14e507b8
FT		 213
214 if (sfp->parentdp->device->type == TYPE_SCANNER)
215 return 0;
216
018e0446 217 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
14e507b8
FT		 218}
219
1da177e4
LT		 220static int
221sg_open(struct inode *inode, struct file *filp)
222{
223 int dev = iminor(inode);
224 int flags = filp->f_flags;
d6b10348 225 struct request_queue *q;
1da177e4
LT		 226 Sg_device *sdp;
227 Sg_fd *sfp;
228 int res;
229 int retval;
230
eb09d3d4 231 lock_kernel();
1da177e4
LT		 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);
c6517b79
TB		 235 if (IS_ERR(sdp)) {
236 retval = PTR_ERR(sdp);
237 sdp = NULL;
238 goto sg_put;
eb09d3d4 239 }
1da177e4
LT		 240
241 /* This driver's module count bumped by fops_get in <linux/fs.h> */
242 /* Prevent the device driver from vanishing while we sleep */
243 retval = scsi_device_get(sdp->device);
c6517b79
TB		 244 if (retval)
245 goto sg_put;
1da177e4
LT		 246
247 if (!((flags & O_NONBLOCK) ||
248 scsi_block_when_processing_errors(sdp->device))) {
249 retval = -ENXIO;
250 /* we are in error recovery for this device */
251 goto error_out;
252 }
253
254 if (flags & O_EXCL) {
255 if (O_RDONLY == (flags & O_ACCMODE)) {
256 retval = -EPERM; /* Can't lock it with read only access */
257 goto error_out;
258 }
3442f802 259 if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) {
1da177e4
LT		 260 retval = -EBUSY;
261 goto error_out;
262 }
263 res = 0;
264 __wait_event_interruptible(sdp->o_excl_wait,
3442f802 265 ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
1da177e4
LT		 266 if (res) {
267 retval = res; /* -ERESTARTSYS because signal hit process */
268 goto error_out;
269 }
270 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
271 if (flags & O_NONBLOCK) {
272 retval = -EBUSY;
273 goto error_out;
274 }
275 res = 0;
276 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
277 res);
278 if (res) {
279 retval = res; /* -ERESTARTSYS because signal hit process */
280 goto error_out;
281 }
282 }
283 if (sdp->detached) {
284 retval = -ENODEV;
285 goto error_out;
286 }
3442f802 287 if (list_empty(&sdp->sfds)) { /* no existing opens on this device */
1da177e4 288 sdp->sgdebug = 0;
d6b10348 289 q = sdp->device->request_queue;
ae03bf63
MP		 290 sdp->sg_tablesize = min(queue_max_hw_segments(q),
291 queue_max_phys_segments(q));
1da177e4
LT		 292 }
293 if ((sfp = sg_add_sfp(sdp, dev)))
294 filp->private_data = sfp;
295 else {
c6517b79 296 if (flags & O_EXCL) {
1da177e4 297 sdp->exclude = 0; /* undo if error */
c6517b79
TB		 298 wake_up_interruptible(&sdp->o_excl_wait);
299 }
1da177e4
LT		 300 retval = -ENOMEM;
301 goto error_out;
302 }
c6517b79
TB		 303 retval = 0;
304error_out:
305 if (retval)
306 scsi_device_put(sdp->device);
307sg_put:
308 if (sdp)
309 sg_put_dev(sdp);
eb09d3d4 310 unlock_kernel();
1da177e4
LT		 311 return retval;
312}
313
314/* Following function was formerly called 'sg_close' */
315static int
316sg_release(struct inode *inode, struct file *filp)
317{
318 Sg_device *sdp;
319 Sg_fd *sfp;
320
321 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
322 return -ENXIO;
323 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
c6517b79
TB		 324
325 sfp->closed = 1;
326
327 sdp->exclude = 0;
328 wake_up_interruptible(&sdp->o_excl_wait);
329
330 kref_put(&sfp->f_ref, sg_remove_sfp);
1da177e4
LT		 331 return 0;
332}
333
334static ssize_t
335sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
336{
1da177e4
LT		 337 Sg_device *sdp;
338 Sg_fd *sfp;
339 Sg_request *srp;
340 int req_pack_id = -1;
1da177e4 341 sg_io_hdr_t *hp;
cb59e840
DG		 342 struct sg_header *old_hdr = NULL;
343 int retval = 0;
1da177e4
LT		 344
345 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
346 return -ENXIO;
347 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
348 sdp->disk->disk_name, (int) count));
d6b10348 349
1da177e4
LT		 350 if (!access_ok(VERIFY_WRITE, buf, count))
351 return -EFAULT;
352 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840
DG		 353 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
354 if (!old_hdr)
355 return -ENOMEM;
356 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
357 retval = -EFAULT;
358 goto free_old_hdr;
359 }
360 if (old_hdr->reply_len < 0) {
1da177e4 361 if (count >= SZ_SG_IO_HDR) {
cb59e840
DG		 362 sg_io_hdr_t *new_hdr;
363 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
364 if (!new_hdr) {
365 retval = -ENOMEM;
366 goto free_old_hdr;
367 }
368 retval =__copy_from_user
369 (new_hdr, buf, SZ_SG_IO_HDR);
370 req_pack_id = new_hdr->pack_id;
371 kfree(new_hdr);
372 if (retval) {
373 retval = -EFAULT;
374 goto free_old_hdr;
375 }
1da177e4
LT		 376 }
377 } else
cb59e840 378 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 379 }
380 srp = sg_get_rq_mark(sfp, req_pack_id);
381 if (!srp) { /* now wait on packet to arrive */
cb59e840
DG		 382 if (sdp->detached) {
383 retval = -ENODEV;
384 goto free_old_hdr;
385 }
386 if (filp->f_flags & O_NONBLOCK) {
387 retval = -EAGAIN;
388 goto free_old_hdr;
389 }
1da177e4 390 while (1) {
cb59e840 391 retval = 0; /* following macro beats race condition */
1da177e4 392 __wait_event_interruptible(sfp->read_wait,
cb59e840
DG		 393 (sdp->detached ||
394 (srp = sg_get_rq_mark(sfp, req_pack_id))),
395 retval);
396 if (sdp->detached) {
397 retval = -ENODEV;
398 goto free_old_hdr;
399 }
400 if (0 == retval)
1da177e4 401 break;
cb59e840
DG		 402
403 /* -ERESTARTSYS as signal hit process */
404 goto free_old_hdr;
1da177e4
LT		 405 }
406 }
cb59e840
DG		 407 if (srp->header.interface_id != '\0') {
408 retval = sg_new_read(sfp, buf, count, srp);
409 goto free_old_hdr;
410 }
1da177e4
LT		 411
412 hp = &srp->header;
cb59e840
DG		 413 if (old_hdr == NULL) {
414 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
415 if (! old_hdr) {
416 retval = -ENOMEM;
417 goto free_old_hdr;
418 }
419 }
420 memset(old_hdr, 0, SZ_SG_HEADER);
421 old_hdr->reply_len = (int) hp->timeout;
422 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
423 old_hdr->pack_id = hp->pack_id;
424 old_hdr->twelve_byte =
1da177e4 425 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840
DG		 426 old_hdr->target_status = hp->masked_status;
427 old_hdr->host_status = hp->host_status;
428 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 429 if ((CHECK_CONDITION & hp->masked_status) ||
430 (DRIVER_SENSE & hp->driver_status))
cb59e840
DG		 431 memcpy(old_hdr->sense_buffer, srp->sense_b,
432 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 433 switch (hp->host_status) {
434 /* This setup of 'result' is for backward compatibility and is best
435 ignored by the user who should use target, host + driver status */
436 case DID_OK:
437 case DID_PASSTHROUGH:
438 case DID_SOFT_ERROR:
cb59e840 439 old_hdr->result = 0;
1da177e4
LT		 440 break;
441 case DID_NO_CONNECT:
442 case DID_BUS_BUSY:
443 case DID_TIME_OUT:
cb59e840 444 old_hdr->result = EBUSY;
1da177e4
LT		 445 break;
446 case DID_BAD_TARGET:
447 case DID_ABORT:
448 case DID_PARITY:
449 case DID_RESET:
450 case DID_BAD_INTR:
cb59e840 451 old_hdr->result = EIO;
1da177e4
LT		 452 break;
453 case DID_ERROR:
cb59e840 454 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 455 hp->masked_status == GOOD) ? 0 : EIO;
456 break;
457 default:
cb59e840 458 old_hdr->result = EIO;
1da177e4
LT		 459 break;
460 }
461
462 /* Now copy the result back to the user buffer. */
463 if (count >= SZ_SG_HEADER) {
cb59e840
DG		 464 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
465 retval = -EFAULT;
466 goto free_old_hdr;
467 }
1da177e4 468 buf += SZ_SG_HEADER;
cb59e840
DG		 469 if (count > old_hdr->reply_len)
470 count = old_hdr->reply_len;
1da177e4 471 if (count > SZ_SG_HEADER) {
cb59e840
DG		 472 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
473 retval = -EFAULT;
474 goto free_old_hdr;
475 }
1da177e4
LT		 476 }
477 } else
cb59e840 478 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 479 sg_finish_rem_req(srp);
cb59e840
DG		 480 retval = count;
481free_old_hdr:
c9475cb0 482 kfree(old_hdr);
cb59e840 483 return retval;
1da177e4
LT		 484}
485
486static ssize_t
487sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
488{
489 sg_io_hdr_t *hp = &srp->header;
490 int err = 0;
491 int len;
492
493 if (count < SZ_SG_IO_HDR) {
494 err = -EINVAL;
495 goto err_out;
496 }
497 hp->sb_len_wr = 0;
498 if ((hp->mx_sb_len > 0) && hp->sbp) {
499 if ((CHECK_CONDITION & hp->masked_status) ||
500 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 501 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 502 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
503 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
504 len = (len > sb_len) ? sb_len : len;
505 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
506 err = -EFAULT;
507 goto err_out;
508 }
509 hp->sb_len_wr = len;
510 }
511 }
512 if (hp->masked_status || hp->host_status || hp->driver_status)
513 hp->info |= SG_INFO_CHECK;
514 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
515 err = -EFAULT;
516 goto err_out;
517 }
0b6cb26c 518err_out:
e7ee4cc0 519 err = sg_finish_rem_req(srp);
1da177e4
LT		 520 return (0 == err) ? count : err;
521}
522
523static ssize_t
524sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
525{
526 int mxsize, cmd_size, k;
527 int input_size, blocking;
528 unsigned char opcode;
529 Sg_device *sdp;
530 Sg_fd *sfp;
531 Sg_request *srp;
532 struct sg_header old_hdr;
533 sg_io_hdr_t *hp;
d6b10348 534 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 535
536 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
537 return -ENXIO;
538 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
539 sdp->disk->disk_name, (int) count));
540 if (sdp->detached)
541 return -ENODEV;
542 if (!((filp->f_flags & O_NONBLOCK) ||
543 scsi_block_when_processing_errors(sdp->device)))
544 return -ENXIO;
545
546 if (!access_ok(VERIFY_READ, buf, count))
547 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
548 if (count < SZ_SG_HEADER)
549 return -EIO;
550 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
551 return -EFAULT;
552 blocking = !(filp->f_flags & O_NONBLOCK);
553 if (old_hdr.reply_len < 0)
a2dd3b4c
TB		 554 return sg_new_write(sfp, filp, buf, count,
555 blocking, 0, 0, NULL);
1da177e4
LT		 556 if (count < (SZ_SG_HEADER + 6))
557 return -EIO; /* The minimum scsi command length is 6 bytes. */
558
559 if (!(srp = sg_add_request(sfp))) {
560 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
561 return -EDOM;
562 }
563 buf += SZ_SG_HEADER;
564 __get_user(opcode, buf);
565 if (sfp->next_cmd_len > 0) {
566 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
567 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
568 sfp->next_cmd_len = 0;
569 sg_remove_request(sfp, srp);
570 return -EIO;
571 }
572 cmd_size = sfp->next_cmd_len;
573 sfp->next_cmd_len = 0; /* reset so only this write() effected */
574 } else {
575 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
576 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
577 cmd_size = 12;
578 }
579 SCSI_LOG_TIMEOUT(4, printk(
580 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
581/* Determine buffer size. */
582 input_size = count - cmd_size;
583 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
584 mxsize -= SZ_SG_HEADER;
585 input_size -= SZ_SG_HEADER;
586 if (input_size < 0) {
587 sg_remove_request(sfp, srp);
588 return -EIO; /* User did not pass enough bytes for this command. */
589 }
590 hp = &srp->header;
591 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
592 hp->cmd_len = (unsigned char) cmd_size;
593 hp->iovec_count = 0;
594 hp->mx_sb_len = 0;
595 if (input_size > 0)
596 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
597 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
598 else
599 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
600 hp->dxfer_len = mxsize;
fad7f01e
FT		 601 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
602 hp->dxferp = (char __user *)buf + cmd_size;
603 else
604 hp->dxferp = NULL;
1da177e4
LT		 605 hp->sbp = NULL;
606 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
607 hp->flags = input_size; /* structure abuse ... */
608 hp->pack_id = old_hdr.pack_id;
609 hp->usr_ptr = NULL;
610 if (__copy_from_user(cmnd, buf, cmd_size))
611 return -EFAULT;
612 /*
613 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
614 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
615 * is a non-zero input_size, so emit a warning.
616 */
eaa3e22e
AK		 617 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
618 static char cmd[TASK_COMM_LEN];
619 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
1da177e4
LT		 620 printk(KERN_WARNING
621 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
ad361c98 622 "guessing data in;\n "
1da177e4
LT		 623 "program %s not setting count and/or reply_len properly\n",
624 old_hdr.reply_len - (int)SZ_SG_HEADER,
625 input_size, (unsigned int) cmnd[0],
626 current->comm);
eaa3e22e
AK		 627 strcpy(cmd, current->comm);
628 }
629 }
1da177e4
LT		 630 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
631 return (k < 0) ? k : count;
632}
633
634static ssize_t
0b07de85 635sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
a2dd3b4c 636 size_t count, int blocking, int read_only, int sg_io_owned,
0b07de85 637 Sg_request **o_srp)
1da177e4
LT		 638{
639 int k;
640 Sg_request *srp;
641 sg_io_hdr_t *hp;
d6b10348 642 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 643 int timeout;
644 unsigned long ul_timeout;
645
646 if (count < SZ_SG_IO_HDR)
647 return -EINVAL;
648 if (!access_ok(VERIFY_READ, buf, count))
649 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
650
651 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
652 if (!(srp = sg_add_request(sfp))) {
653 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
654 return -EDOM;
655 }
a2dd3b4c 656 srp->sg_io_owned = sg_io_owned;
1da177e4
LT		 657 hp = &srp->header;
658 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
659 sg_remove_request(sfp, srp);
660 return -EFAULT;
661 }
662 if (hp->interface_id != 'S') {
663 sg_remove_request(sfp, srp);
664 return -ENOSYS;
665 }
666 if (hp->flags & SG_FLAG_MMAP_IO) {
667 if (hp->dxfer_len > sfp->reserve.bufflen) {
668 sg_remove_request(sfp, srp);
669 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
670 }
671 if (hp->flags & SG_FLAG_DIRECT_IO) {
672 sg_remove_request(sfp, srp);
673 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
674 }
675 if (sg_res_in_use(sfp)) {
676 sg_remove_request(sfp, srp);
677 return -EBUSY; /* reserve buffer already being used */
678 }
679 }
680 ul_timeout = msecs_to_jiffies(srp->header.timeout);
681 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
682 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
683 sg_remove_request(sfp, srp);
684 return -EMSGSIZE;
685 }
686 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
687 sg_remove_request(sfp, srp);
688 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
689 }
690 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
691 sg_remove_request(sfp, srp);
692 return -EFAULT;
693 }
14e507b8 694 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 695 sg_remove_request(sfp, srp);
696 return -EPERM;
697 }
698 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
699 if (k < 0)
700 return k;
701 if (o_srp)
702 *o_srp = srp;
703 return count;
704}
705
706static int
707sg_common_write(Sg_fd * sfp, Sg_request * srp,
708 unsigned char *cmnd, int timeout, int blocking)
709{
d6b10348 710 int k, data_dir;
1da177e4
LT		 711 Sg_device *sdp = sfp->parentdp;
712 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 713
714 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
715 hp->status = 0;
716 hp->masked_status = 0;
717 hp->msg_status = 0;
718 hp->info = 0;
719 hp->host_status = 0;
720 hp->driver_status = 0;
721 hp->resid = 0;
722 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
723 (int) cmnd[0], (int) hp->cmd_len));
724
10865dfa
FT		 725 k = sg_start_req(srp, cmnd);
726 if (k) {
7ca63cb4 727 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 728 sg_finish_rem_req(srp);
729 return k; /* probably out of space --> ENOMEM */
730 }
1da177e4
LT		 731 if (sdp->detached) {
732 sg_finish_rem_req(srp);
733 return -ENODEV;
734 }
1da177e4 735
1da177e4
LT		 736 switch (hp->dxfer_direction) {
737 case SG_DXFER_TO_FROM_DEV:
738 case SG_DXFER_FROM_DEV:
d6b10348 739 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 740 break;
741 case SG_DXFER_TO_DEV:
d6b10348 742 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 743 break;
744 case SG_DXFER_UNKNOWN:
d6b10348 745 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 746 break;
747 default:
d6b10348 748 data_dir = DMA_NONE;
1da177e4
LT		 749 break;
750 }
cb59e840 751 hp->duration = jiffies_to_msecs(jiffies);
10db10d1
FT		 752
753 srp->rq->timeout = timeout;
c6517b79 754 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
10db10d1
FT		 755 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
756 srp->rq, 1, sg_rq_end_io);
757 return 0;
1da177e4
LT		 758}
759
1da177e4
LT		 760static int
761sg_ioctl(struct inode *inode, struct file *filp,
762 unsigned int cmd_in, unsigned long arg)
763{
764 void __user *p = (void __user *)arg;
765 int __user *ip = p;
766 int result, val, read_only;
767 Sg_device *sdp;
768 Sg_fd *sfp;
769 Sg_request *srp;
770 unsigned long iflags;
771
772 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
773 return -ENXIO;
abf54393 774
1da177e4
LT		 775 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
776 sdp->disk->disk_name, (int) cmd_in));
777 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
778
779 switch (cmd_in) {
780 case SG_IO:
781 {
782 int blocking = 1; /* ignore O_NONBLOCK flag */
783
784 if (sdp->detached)
785 return -ENODEV;
786 if (!scsi_block_when_processing_errors(sdp->device))
787 return -ENXIO;
788 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
789 return -EFAULT;
790 result =
0b07de85 791 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
a2dd3b4c 792 blocking, read_only, 1, &srp);
1da177e4
LT		 793 if (result < 0)
794 return result;
1da177e4
LT		 795 while (1) {
796 result = 0; /* following macro to beat race condition */
797 __wait_event_interruptible(sfp->read_wait,
a2dd3b4c
TB		 798 (srp->done || sdp->detached),
799 result);
1da177e4
LT		 800 if (sdp->detached)
801 return -ENODEV;
a2dd3b4c
TB		 802 write_lock_irq(&sfp->rq_list_lock);
803 if (srp->done) {
804 srp->done = 2;
805 write_unlock_irq(&sfp->rq_list_lock);
1da177e4 806 break;
a2dd3b4c 807 }
1da177e4 808 srp->orphan = 1;
a2dd3b4c 809 write_unlock_irq(&sfp->rq_list_lock);
1da177e4
LT		 810 return result; /* -ERESTARTSYS because signal hit process */
811 }
1da177e4
LT		 812 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
813 return (result < 0) ? result : 0;
814 }
815 case SG_SET_TIMEOUT:
816 result = get_user(val, ip);
817 if (result)
818 return result;
819 if (val < 0)
820 return -EIO;
821 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
822 val = MULDIV (INT_MAX, USER_HZ, HZ);
823 sfp->timeout_user = val;
824 sfp->timeout = MULDIV (val, HZ, USER_HZ);
825
826 return 0;
827 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
828 /* strange ..., for backward compatibility */
829 return sfp->timeout_user;
830 case SG_SET_FORCE_LOW_DMA:
831 result = get_user(val, ip);
832 if (result)
833 return result;
834 if (val) {
835 sfp->low_dma = 1;
836 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
837 val = (int) sfp->reserve.bufflen;
838 sg_remove_scat(&sfp->reserve);
839 sg_build_reserve(sfp, val);
840 }
841 } else {
842 if (sdp->detached)
843 return -ENODEV;
844 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
845 }
846 return 0;
847 case SG_GET_LOW_DMA:
848 return put_user((int) sfp->low_dma, ip);
849 case SG_GET_SCSI_ID:
850 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
851 return -EFAULT;
852 else {
853 sg_scsi_id_t __user *sg_idp = p;
854
855 if (sdp->detached)
856 return -ENODEV;
857 __put_user((int) sdp->device->host->host_no,
858 &sg_idp->host_no);
859 __put_user((int) sdp->device->channel,
860 &sg_idp->channel);
861 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
862 __put_user((int) sdp->device->lun, &sg_idp->lun);
863 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
864 __put_user((short) sdp->device->host->cmd_per_lun,
865 &sg_idp->h_cmd_per_lun);
866 __put_user((short) sdp->device->queue_depth,
867 &sg_idp->d_queue_depth);
868 __put_user(0, &sg_idp->unused[0]);
869 __put_user(0, &sg_idp->unused[1]);
870 return 0;
871 }
872 case SG_SET_FORCE_PACK_ID:
873 result = get_user(val, ip);
874 if (result)
875 return result;
876 sfp->force_packid = val ? 1 : 0;
877 return 0;
878 case SG_GET_PACK_ID:
879 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
880 return -EFAULT;
881 read_lock_irqsave(&sfp->rq_list_lock, iflags);
882 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
883 if ((1 == srp->done) && (!srp->sg_io_owned)) {
884 read_unlock_irqrestore(&sfp->rq_list_lock,
885 iflags);
886 __put_user(srp->header.pack_id, ip);
887 return 0;
888 }
889 }
890 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
891 __put_user(-1, ip);
892 return 0;
893 case SG_GET_NUM_WAITING:
894 read_lock_irqsave(&sfp->rq_list_lock, iflags);
895 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
896 if ((1 == srp->done) && (!srp->sg_io_owned))
897 ++val;
898 }
899 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
900 return put_user(val, ip);
901 case SG_GET_SG_TABLESIZE:
902 return put_user(sdp->sg_tablesize, ip);
903 case SG_SET_RESERVED_SIZE:
904 result = get_user(val, ip);
905 if (result)
906 return result;
907 if (val < 0)
908 return -EINVAL;
44ec9542 909 val = min_t(int, val,
ae03bf63 910 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 911 if (val != sfp->reserve.bufflen) {
912 if (sg_res_in_use(sfp) || sfp->mmap_called)
913 return -EBUSY;
914 sg_remove_scat(&sfp->reserve);
915 sg_build_reserve(sfp, val);
916 }
917 return 0;
918 case SG_GET_RESERVED_SIZE:
44ec9542 919 val = min_t(int, sfp->reserve.bufflen,
ae03bf63 920 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 921 return put_user(val, ip);
922 case SG_SET_COMMAND_Q:
923 result = get_user(val, ip);
924 if (result)
925 return result;
926 sfp->cmd_q = val ? 1 : 0;
927 return 0;
928 case SG_GET_COMMAND_Q:
929 return put_user((int) sfp->cmd_q, ip);
930 case SG_SET_KEEP_ORPHAN:
931 result = get_user(val, ip);
932 if (result)
933 return result;
934 sfp->keep_orphan = val;
935 return 0;
936 case SG_GET_KEEP_ORPHAN:
937 return put_user((int) sfp->keep_orphan, ip);
938 case SG_NEXT_CMD_LEN:
939 result = get_user(val, ip);
940 if (result)
941 return result;
942 sfp->next_cmd_len = (val > 0) ? val : 0;
943 return 0;
944 case SG_GET_VERSION_NUM:
945 return put_user(sg_version_num, ip);
946 case SG_GET_ACCESS_COUNT:
947 /* faked - we don't have a real access count anymore */
948 val = (sdp->device ? 1 : 0);
949 return put_user(val, ip);
950 case SG_GET_REQUEST_TABLE:
951 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
952 return -EFAULT;
953 else {
cb59e840
DG		 954 sg_req_info_t *rinfo;
955 unsigned int ms;
956
957 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
958 GFP_KERNEL);
959 if (!rinfo)
960 return -ENOMEM;
1da177e4
LT		 961 read_lock_irqsave(&sfp->rq_list_lock, iflags);
962 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
963 ++val, srp = srp ? srp->nextrp : srp) {
964 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
965 if (srp) {
966 rinfo[val].req_state = srp->done + 1;
967 rinfo[val].problem =
968 srp->header.masked_status &
969 srp->header.host_status &
970 srp->header.driver_status;
cb59e840
DG		 971 if (srp->done)
972 rinfo[val].duration =
973 srp->header.duration;
974 else {
975 ms = jiffies_to_msecs(jiffies);
976 rinfo[val].duration =
977 (ms > srp->header.duration) ?
978 (ms - srp->header.duration) : 0;
979 }
1da177e4 980 rinfo[val].orphan = srp->orphan;
cb59e840
DG		 981 rinfo[val].sg_io_owned =
982 srp->sg_io_owned;
983 rinfo[val].pack_id =
984 srp->header.pack_id;
985 rinfo[val].usr_ptr =
986 srp->header.usr_ptr;
1da177e4
LT		 987 }
988 }
989 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840
DG		 990 result = __copy_to_user(p, rinfo,
991 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
992 result = result ? -EFAULT : 0;
993 kfree(rinfo);
994 return result;
1da177e4
LT		 995 }
996 case SG_EMULATED_HOST:
997 if (sdp->detached)
998 return -ENODEV;
999 return put_user(sdp->device->host->hostt->emulated, ip);
1000 case SG_SCSI_RESET:
1001 if (sdp->detached)
1002 return -ENODEV;
1003 if (filp->f_flags & O_NONBLOCK) {
939647ee 1004 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1005 return -EBUSY;
1006 } else if (!scsi_block_when_processing_errors(sdp->device))
1007 return -EBUSY;
1008 result = get_user(val, ip);
1009 if (result)
1010 return result;
1011 if (SG_SCSI_RESET_NOTHING == val)
1012 return 0;
1013 switch (val) {
1014 case SG_SCSI_RESET_DEVICE:
1015 val = SCSI_TRY_RESET_DEVICE;
1016 break;
39120e11
BK		 1017 case SG_SCSI_RESET_TARGET:
1018 val = SCSI_TRY_RESET_TARGET;
1019 break;
1da177e4
LT		 1020 case SG_SCSI_RESET_BUS:
1021 val = SCSI_TRY_RESET_BUS;
1022 break;
1023 case SG_SCSI_RESET_HOST:
1024 val = SCSI_TRY_RESET_HOST;
1025 break;
1026 default:
1027 return -EINVAL;
1028 }
1029 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1030 return -EACCES;
1031 return (scsi_reset_provider(sdp->device, val) ==
1032 SUCCESS) ? 0 : -EIO;
1033 case SCSI_IOCTL_SEND_COMMAND:
1034 if (sdp->detached)
1035 return -ENODEV;
1036 if (read_only) {
1037 unsigned char opcode = WRITE_6;
1038 Scsi_Ioctl_Command __user *siocp = p;
1039
1040 if (copy_from_user(&opcode, siocp->data, 1))
1041 return -EFAULT;
14e507b8 1042 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1043 return -EPERM;
1044 }
e915e872 1045 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1da177e4
LT		 1046 case SG_SET_DEBUG:
1047 result = get_user(val, ip);
1048 if (result)
1049 return result;
1050 sdp->sgdebug = (char) val;
1051 return 0;
1052 case SCSI_IOCTL_GET_IDLUN:
1053 case SCSI_IOCTL_GET_BUS_NUMBER:
1054 case SCSI_IOCTL_PROBE_HOST:
1055 case SG_GET_TRANSFORM:
1056 if (sdp->detached)
1057 return -ENODEV;
1058 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542 1059 case BLKSECTGET:
ae03bf63 1060 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
44ec9542 1061 ip);
6da127ad
CS		 1062 case BLKTRACESETUP:
1063 return blk_trace_setup(sdp->device->request_queue,
1064 sdp->disk->disk_name,
76e3a19d 1065 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
d0deef5b 1066 NULL,
6da127ad
CS		 1067 (char *)arg);
1068 case BLKTRACESTART:
1069 return blk_trace_startstop(sdp->device->request_queue, 1);
1070 case BLKTRACESTOP:
1071 return blk_trace_startstop(sdp->device->request_queue, 0);
1072 case BLKTRACETEARDOWN:
1073 return blk_trace_remove(sdp->device->request_queue);
1da177e4
LT		 1074 default:
1075 if (read_only)
1076 return -EPERM; /* don't know so take safe approach */
1077 return scsi_ioctl(sdp->device, cmd_in, p);
1078 }
1079}
1080
1081#ifdef CONFIG_COMPAT
1082static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1083{
1084 Sg_device *sdp;
1085 Sg_fd *sfp;
1086 struct scsi_device *sdev;
1087
1088 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1089 return -ENXIO;
1090
1091 sdev = sdp->device;
1092 if (sdev->host->hostt->compat_ioctl) {
1093 int ret;
1094
1095 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1096
1097 return ret;
1098 }
1099
1100 return -ENOIOCTLCMD;
1101}
1102#endif
1103
1104static unsigned int
1105sg_poll(struct file *filp, poll_table * wait)
1106{
1107 unsigned int res = 0;
1108 Sg_device *sdp;
1109 Sg_fd *sfp;
1110 Sg_request *srp;
1111 int count = 0;
1112 unsigned long iflags;
1113
1114 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1115 || sfp->closed)
1116 return POLLERR;
1117 poll_wait(filp, &sfp->read_wait, wait);
1118 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1119 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1120 /* if any read waiting, flag it */
1121 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1122 res = POLLIN | POLLRDNORM;
1123 ++count;
1124 }
1125 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1126
1127 if (sdp->detached)
1128 res |= POLLHUP;
1129 else if (!sfp->cmd_q) {
1130 if (0 == count)
1131 res |= POLLOUT | POLLWRNORM;
1132 } else if (count < SG_MAX_QUEUE)
1133 res |= POLLOUT | POLLWRNORM;
1134 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1135 sdp->disk->disk_name, (int) res));
1136 return res;
1137}
1138
1139static int
1140sg_fasync(int fd, struct file *filp, int mode)
1141{
1da177e4
LT		 1142 Sg_device *sdp;
1143 Sg_fd *sfp;
1144
1145 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1146 return -ENXIO;
1147 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1148 sdp->disk->disk_name, mode));
1149
60aa4924 1150 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1da177e4
LT		 1151}
1152
a13ff0bb
NP		 1153static int
1154sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1155{
1156 Sg_fd *sfp;
d6b10348 1157 unsigned long offset, len, sa;
1da177e4 1158 Sg_scatter_hold *rsv_schp;
10db10d1 1159 int k, length;
1da177e4
LT		 1160
1161 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1162 return VM_FAULT_SIGBUS;
1da177e4 1163 rsv_schp = &sfp->reserve;
a13ff0bb 1164 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1165 if (offset >= rsv_schp->bufflen)
a13ff0bb
NP		 1166 return VM_FAULT_SIGBUS;
1167 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1da177e4 1168 offset, rsv_schp->k_use_sg));
d6b10348 1169 sa = vma->vm_start;
10db10d1
FT		 1170 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1171 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1172 len = vma->vm_end - sa;
10db10d1 1173 len = (len < length) ? len : length;
d6b10348 1174 if (offset < len) {
10db10d1
FT		 1175 struct page *page = nth_page(rsv_schp->pages[k],
1176 offset >> PAGE_SHIFT);
d6b10348 1177 get_page(page); /* increment page count */
a13ff0bb
NP		 1178 vmf->page = page;
1179 return 0; /* success */
1da177e4 1180 }
d6b10348
MC		 1181 sa += len;
1182 offset -= len;
1da177e4 1183 }
d6b10348 1184
a13ff0bb 1185 return VM_FAULT_SIGBUS;
1da177e4
LT		 1186}
1187
1188static struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1189 .fault = sg_vma_fault,
1da177e4
LT		 1190};
1191
1192static int
1193sg_mmap(struct file *filp, struct vm_area_struct *vma)
1194{
1195 Sg_fd *sfp;
d6b10348 1196 unsigned long req_sz, len, sa;
1da177e4 1197 Sg_scatter_hold *rsv_schp;
10db10d1 1198 int k, length;
1da177e4
LT		 1199
1200 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1201 return -ENXIO;
cb59e840 1202 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1203 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1204 (void *) vma->vm_start, (int) req_sz));
1205 if (vma->vm_pgoff)
1206 return -EINVAL; /* want no offset */
1207 rsv_schp = &sfp->reserve;
1208 if (req_sz > rsv_schp->bufflen)
1209 return -ENOMEM; /* cannot map more than reserved buffer */
1210
d6b10348 1211 sa = vma->vm_start;
10db10d1
FT		 1212 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1213 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1214 len = vma->vm_end - sa;
10db10d1 1215 len = (len < length) ? len : length;
d6b10348 1216 sa += len;
1da177e4 1217 }
d6b10348 1218
f9aed0e2 1219 sfp->mmap_called = 1;
1c8e71d7 1220 vma->vm_flags |= VM_RESERVED;
1da177e4
LT		 1221 vma->vm_private_data = sfp;
1222 vma->vm_ops = &sg_mmap_vm_ops;
1223 return 0;
1224}
1225
c96952ed
FT		 1226static void sg_rq_end_io_usercontext(struct work_struct *work)
1227{
1228 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1229 struct sg_fd *sfp = srp->parentfp;
1230
1231 sg_finish_rem_req(srp);
1232 kref_put(&sfp->f_ref, sg_remove_sfp);
1233}
1234
a91a3a20
FT		 1235/*
1236 * This function is a "bottom half" handler that is called by the mid
1237 * level when a command is completed (or has failed).
1238 */
1239static void sg_rq_end_io(struct request *rq, int uptodate)
1da177e4 1240{
a91a3a20 1241 struct sg_request *srp = rq->end_io_data;
c6517b79 1242 Sg_device *sdp;
1da177e4 1243 Sg_fd *sfp;
1da177e4 1244 unsigned long iflags;
cb59e840 1245 unsigned int ms;
a91a3a20 1246 char *sense;
c6517b79 1247 int result, resid, done = 1;
1da177e4 1248
c6517b79 1249 if (WARN_ON(srp->done != 0))
1da177e4 1250 return;
c6517b79 1251
1da177e4 1252 sfp = srp->parentfp;
c6517b79 1253 if (WARN_ON(sfp == NULL))
1da177e4 1254 return;
c6517b79
TB		 1255
1256 sdp = sfp->parentdp;
1257 if (unlikely(sdp->detached))
1258 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1da177e4 1259
a91a3a20
FT		 1260 sense = rq->sense;
1261 result = rq->errors;
c3a4d78c 1262 resid = rq->resid_len;
1da177e4
LT		 1263
1264 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1265 sdp->disk->disk_name, srp->header.pack_id, result));
1266 srp->header.resid = resid;
cb59e840
DG		 1267 ms = jiffies_to_msecs(jiffies);
1268 srp->header.duration = (ms > srp->header.duration) ?
1269 (ms - srp->header.duration) : 0;
d6b10348 1270 if (0 != result) {
1da177e4
LT		 1271 struct scsi_sense_hdr sshdr;
1272
d6b10348
MC		 1273 srp->header.status = 0xff & result;
1274 srp->header.masked_status = status_byte(result);
1275 srp->header.msg_status = msg_byte(result);
1276 srp->header.host_status = host_byte(result);
1277 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1278 if ((sdp->sgdebug > 0) &&
1279 ((CHECK_CONDITION == srp->header.masked_status) ||
1280 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1281 __scsi_print_sense("sg_cmd_done", sense,
1282 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1283
1284 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1285 if (driver_byte(result) != 0
1286 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1287 && !scsi_sense_is_deferred(&sshdr)
1288 && sshdr.sense_key == UNIT_ATTENTION
1289 && sdp->device->removable) {
1290 /* Detected possible disc change. Set the bit - this */
1291 /* may be used if there are filesystems using this device */
1292 sdp->device->changed = 1;
1293 }
1294 }
1295 /* Rely on write phase to clean out srp status values, so no "else" */
1296
c6517b79
TB		 1297 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1298 if (unlikely(srp->orphan)) {
1da177e4
LT		 1299 if (sfp->keep_orphan)
1300 srp->sg_io_owned = 0;
c6517b79
TB		 1301 else
1302 done = 0;
1da177e4 1303 }
c6517b79
TB		 1304 srp->done = done;
1305 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1306
1307 if (likely(done)) {
1308 /* Now wake up any sg_read() that is waiting for this
1309 * packet.
1310 */
1da177e4 1311 wake_up_interruptible(&sfp->read_wait);
c6517b79 1312 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
c96952ed 1313 kref_put(&sfp->f_ref, sg_remove_sfp);
015640ed
FT		 1314 } else {
1315 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1316 schedule_work(&srp->ew.work);
1317 }
1da177e4
LT		 1318}
1319
1320static struct file_operations sg_fops = {
1321 .owner = THIS_MODULE,
1322 .read = sg_read,
1323 .write = sg_write,
1324 .poll = sg_poll,
1325 .ioctl = sg_ioctl,
1326#ifdef CONFIG_COMPAT
1327 .compat_ioctl = sg_compat_ioctl,
1328#endif
1329 .open = sg_open,
1330 .mmap = sg_mmap,
1331 .release = sg_release,
1332 .fasync = sg_fasync,
1333};
1334
d253878b 1335static struct class *sg_sysfs_class;
1da177e4
LT		 1336
1337static int sg_sysfs_valid = 0;
1338
7c07d613 1339static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1340{
d6b10348 1341 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1342 Sg_device *sdp;
1343 unsigned long iflags;
7c07d613
JB		 1344 int error;
1345 u32 k;
1da177e4 1346
24669f75 1347 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1348 if (!sdp) {
1349 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1350 return ERR_PTR(-ENOMEM);
1351 }
c6517b79 1352
7c07d613
JB		 1353 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1354 printk(KERN_WARNING "idr expansion Sg_device failure\n");
c6517b79 1355 error = -ENOMEM;
7c07d613 1356 goto out;
1da177e4
LT		 1357 }
1358
7c07d613 1359 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4 1360
c6517b79 1361 error = idr_get_new(&sg_index_idr, sdp, &k);
7c07d613 1362 if (error) {
c6517b79 1363 write_unlock_irqrestore(&sg_index_lock, iflags);
7c07d613
JB		 1364 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1365 error);
1366 goto out;
1da177e4
LT		 1367 }
1368
1da177e4
LT		 1369 if (unlikely(k >= SG_MAX_DEVS))
1370 goto overflow;
1371
1da177e4
LT		 1372 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1373 sprintf(disk->disk_name, "sg%d", k);
1374 disk->first_minor = k;
1375 sdp->disk = disk;
1376 sdp->device = scsidp;
3442f802 1377 INIT_LIST_HEAD(&sdp->sfds);
1da177e4 1378 init_waitqueue_head(&sdp->o_excl_wait);
ae03bf63
MP		 1379 sdp->sg_tablesize = min(queue_max_hw_segments(q),
1380 queue_max_phys_segments(q));
7c07d613 1381 sdp->index = k;
c6517b79
TB		 1382 kref_init(&sdp->d_ref);
1383
1384 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 1385
7c07d613 1386 error = 0;
1da177e4 1387 out:
7c07d613 1388 if (error) {
1da177e4 1389 kfree(sdp);
7c07d613
JB		 1390 return ERR_PTR(error);
1391 }
1392 return sdp;
1da177e4
LT		 1393
1394 overflow:
c6517b79
TB		 1395 idr_remove(&sg_index_idr, k);
1396 write_unlock_irqrestore(&sg_index_lock, iflags);
9ccfc756
JB		 1397 sdev_printk(KERN_WARNING, scsidp,
1398 "Unable to attach sg device type=%d, minor "
1399 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1da177e4
LT		 1400 error = -ENODEV;
1401 goto out;
1402}
1403
1404static int
ee959b00 1405sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1406{
ee959b00 1407 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1408 struct gendisk *disk;
1409 Sg_device *sdp = NULL;
1410 struct cdev * cdev = NULL;
7c07d613 1411 int error;
454e8957 1412 unsigned long iflags;
1da177e4
LT		 1413
1414 disk = alloc_disk(1);
1415 if (!disk) {
1416 printk(KERN_WARNING "alloc_disk failed\n");
1417 return -ENOMEM;
1418 }
1419 disk->major = SCSI_GENERIC_MAJOR;
1420
1421 error = -ENOMEM;
1422 cdev = cdev_alloc();
1423 if (!cdev) {
1424 printk(KERN_WARNING "cdev_alloc failed\n");
1425 goto out;
1426 }
1427 cdev->owner = THIS_MODULE;
1428 cdev->ops = &sg_fops;
1429
7c07d613
JB		 1430 sdp = sg_alloc(disk, scsidp);
1431 if (IS_ERR(sdp)) {
1da177e4 1432 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1433 error = PTR_ERR(sdp);
1da177e4
LT		 1434 goto out;
1435 }
1da177e4 1436
7c07d613 1437 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1438 if (error)
454e8957 1439 goto cdev_add_err;
5e3c34c1 1440
1da177e4
LT		 1441 sdp->cdev = cdev;
1442 if (sg_sysfs_valid) {
ee959b00 1443 struct device *sg_class_member;
1da177e4 1444
d73a1a67
GKH		 1445 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1446 MKDEV(SCSI_GENERIC_MAJOR,
1447 sdp->index),
1448 sdp, "%s", disk->disk_name);
d07e0361
FT		 1449 if (IS_ERR(sg_class_member)) {
1450 printk(KERN_ERR "sg_add: "
ee959b00 1451 "device_create failed\n");
d07e0361
FT		 1452 error = PTR_ERR(sg_class_member);
1453 goto cdev_add_err;
1454 }
d07e0361 1455 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1456 &sg_class_member->kobj, "generic");
1457 if (error)
1458 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1459 "'generic' back to sg%d\n", sdp->index);
1da177e4 1460 } else
7c07d613 1461 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1462
9ccfc756 1463 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1464 "Attached scsi generic sg%d type %d\n", sdp->index,
1465 scsidp->type);
1da177e4 1466
ee959b00 1467 dev_set_drvdata(cl_dev, sdp);
a24484f2 1468
1da177e4
LT		 1469 return 0;
1470
454e8957 1471cdev_add_err:
7c07d613
JB		 1472 write_lock_irqsave(&sg_index_lock, iflags);
1473 idr_remove(&sg_index_idr, sdp->index);
1474 write_unlock_irqrestore(&sg_index_lock, iflags);
1475 kfree(sdp);
454e8957 1476
1da177e4
LT		 1477out:
1478 put_disk(disk);
1479 if (cdev)
1480 cdev_del(cdev);
1481 return error;
1482}
1483
c6517b79
TB		 1484static void sg_device_destroy(struct kref *kref)
1485{
1486 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1487 unsigned long flags;
1488
1489 /* CAUTION! Note that the device can still be found via idr_find()
1490 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1491 * any other cleanup.
1492 */
1493
1494 write_lock_irqsave(&sg_index_lock, flags);
1495 idr_remove(&sg_index_idr, sdp->index);
1496 write_unlock_irqrestore(&sg_index_lock, flags);
1497
1498 SCSI_LOG_TIMEOUT(3,
1499 printk("sg_device_destroy: %s\n",
1500 sdp->disk->disk_name));
1501
1502 put_disk(sdp->disk);
1503 kfree(sdp);
1504}
1505
1506static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1507{
ee959b00
TJ		 1508 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1509 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1510 unsigned long iflags;
1511 Sg_fd *sfp;
1da177e4 1512
c6517b79 1513 if (!sdp || sdp->detached)
1da177e4 1514 return;
7c07d613 1515
c6517b79
TB		 1516 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1517
1518 /* Need a write lock to set sdp->detached. */
7c07d613 1519 write_lock_irqsave(&sg_index_lock, iflags);
c6517b79 1520 sdp->detached = 1;
3442f802 1521 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
c6517b79
TB		 1522 wake_up_interruptible(&sfp->read_wait);
1523 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
7c07d613
JB		 1524 }
1525 write_unlock_irqrestore(&sg_index_lock, iflags);
1526
1527 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1528 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1529 cdev_del(sdp->cdev);
1530 sdp->cdev = NULL;
1da177e4 1531
c6517b79 1532 sg_put_dev(sdp);
1da177e4
LT		 1533}
1534
6460e75a
DG		 1535module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1536module_param_named(def_reserved_size, def_reserved_size, int,
1537 S_IRUGO | S_IWUSR);
1da177e4
LT		 1538module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1539
1540MODULE_AUTHOR("Douglas Gilbert");
1541MODULE_DESCRIPTION("SCSI generic (sg) driver");
1542MODULE_LICENSE("GPL");
1543MODULE_VERSION(SG_VERSION_STR);
f018fa55 1544MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1545
6460e75a
DG		 1546MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1547 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1548MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1549MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1550
1551static int __init
1552init_sg(void)
1553{
1554 int rc;
1555
6460e75a
DG		 1556 if (scatter_elem_sz < PAGE_SIZE) {
1557 scatter_elem_sz = PAGE_SIZE;
1558 scatter_elem_sz_prev = scatter_elem_sz;
1559 }
1da177e4
LT		 1560 if (def_reserved_size >= 0)
1561 sg_big_buff = def_reserved_size;
6460e75a
DG		 1562 else
1563 def_reserved_size = sg_big_buff;
1da177e4
LT		 1564
1565 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1566 SG_MAX_DEVS, "sg");
1567 if (rc)
1568 return rc;
d253878b 1569 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1570 if ( IS_ERR(sg_sysfs_class) ) {
1571 rc = PTR_ERR(sg_sysfs_class);
1572 goto err_out;
1573 }
1574 sg_sysfs_valid = 1;
1575 rc = scsi_register_interface(&sg_interface);
1576 if (0 == rc) {
1577#ifdef CONFIG_SCSI_PROC_FS
1578 sg_proc_init();
1579#endif /* CONFIG_SCSI_PROC_FS */
1580 return 0;
1581 }
d253878b 1582 class_destroy(sg_sysfs_class);
1da177e4
LT		 1583err_out:
1584 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1585 return rc;
1586}
1587
1588static void __exit
1589exit_sg(void)
1590{
1591#ifdef CONFIG_SCSI_PROC_FS
1592 sg_proc_cleanup();
1593#endif /* CONFIG_SCSI_PROC_FS */
1594 scsi_unregister_interface(&sg_interface);
d253878b 1595 class_destroy(sg_sysfs_class);
1da177e4
LT		 1596 sg_sysfs_valid = 0;
1597 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1598 SG_MAX_DEVS);
7c07d613 1599 idr_destroy(&sg_index_idr);
1da177e4
LT		 1600}
1601
44c7b0ea 1602static int sg_start_req(Sg_request *srp, unsigned char *cmd)
10865dfa 1603{
626710c9 1604 int res;
10865dfa 1605 struct request *rq;
44c7b0ea
FT		 1606 Sg_fd *sfp = srp->parentfp;
1607 sg_io_hdr_t *hp = &srp->header;
1608 int dxfer_len = (int) hp->dxfer_len;
1609 int dxfer_dir = hp->dxfer_direction;
626710c9 1610 unsigned int iov_count = hp->iovec_count;
44c7b0ea
FT		 1611 Sg_scatter_hold *req_schp = &srp->data;
1612 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1613 struct request_queue *q = sfp->parentdp->device->request_queue;
626710c9 1614 struct rq_map_data *md, map_data;
10865dfa
FT		 1615 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1616
44c7b0ea
FT		 1617 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1618 dxfer_len));
1619
10865dfa
FT		 1620 rq = blk_get_request(q, rw, GFP_ATOMIC);
1621 if (!rq)
1622 return -ENOMEM;
1623
1624 memcpy(rq->cmd, cmd, hp->cmd_len);
1625
1626 rq->cmd_len = hp->cmd_len;
1627 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1628
1629 srp->rq = rq;
1630 rq->end_io_data = srp;
1631 rq->sense = srp->sense_b;
1632 rq->retries = SG_DEFAULT_RETRIES;
1633
1da177e4 1634 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1635 return 0;
10865dfa 1636
626710c9
FT		 1637 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1638 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1639 !sfp->parentdp->device->host->unchecked_isa_dma &&
01cfcddd 1640 blk_rq_aligned(q, hp->dxferp, dxfer_len))
626710c9
FT		 1641 md = NULL;
1642 else
1643 md = &map_data;
1644
1645 if (md) {
1646 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1647 sg_link_reserve(sfp, srp, dxfer_len);
1648 else {
1649 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1650 if (res)
1651 return res;
1652 }
7e56cb0f 1653
626710c9
FT		 1654 md->pages = req_schp->pages;
1655 md->page_order = req_schp->page_order;
1656 md->nr_entries = req_schp->k_use_sg;
56c451f4 1657 md->offset = 0;
97ae77a1 1658 md->null_mapped = hp->dxferp ? 0 : 1;
ecb554a8
FT		 1659 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1660 md->from_user = 1;
1661 else
1662 md->from_user = 0;
626710c9
FT		 1663 }
1664
0fdf96b6
FT		 1665 if (iov_count) {
1666 int len, size = sizeof(struct sg_iovec) * iov_count;
1667 struct iovec *iov;
1668
1669 iov = kmalloc(size, GFP_ATOMIC);
1670 if (!iov)
1671 return -ENOMEM;
1672
1673 if (copy_from_user(iov, hp->dxferp, size)) {
1674 kfree(iov);
1675 return -EFAULT;
1676 }
1677
1678 len = iov_length(iov, iov_count);
1679 if (hp->dxfer_len < len) {
1680 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1681 len = hp->dxfer_len;
1682 }
1683
1684 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1685 iov_count,
1686 len, GFP_ATOMIC);
1687 kfree(iov);
1688 } else
626710c9
FT		 1689 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1690 hp->dxfer_len, GFP_ATOMIC);
10db10d1
FT		 1691
1692 if (!res) {
626710c9 1693 srp->bio = rq->bio;
10db10d1 1694
626710c9
FT		 1695 if (!md) {
1696 req_schp->dio_in_use = 1;
1697 hp->info |= SG_INFO_DIRECT_IO;
1698 }
1699 }
10db10d1 1700 return res;
1da177e4
LT		 1701}
1702
e7ee4cc0 1703static int sg_finish_rem_req(Sg_request * srp)
1da177e4 1704{
e7ee4cc0
FT		 1705 int ret = 0;
1706
1da177e4
LT		 1707 Sg_fd *sfp = srp->parentfp;
1708 Sg_scatter_hold *req_schp = &srp->data;
1709
1710 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1711 if (srp->res_used)
1712 sg_unlink_reserve(sfp, srp);
1713 else
1714 sg_remove_scat(req_schp);
10865dfa 1715
6e5a30cb
FT		 1716 if (srp->rq) {
1717 if (srp->bio)
e7ee4cc0 1718 ret = blk_rq_unmap_user(srp->bio);
10db10d1 1719
10865dfa 1720 blk_put_request(srp->rq);
6e5a30cb 1721 }
10865dfa 1722
1da177e4 1723 sg_remove_request(sfp, srp);
e7ee4cc0
FT		 1724
1725 return ret;
1da177e4
LT		 1726}
1727
1728static int
1729sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1730{
10db10d1 1731 int sg_bufflen = tablesize * sizeof(struct page *);
2d20eaf9 1732 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1733
10db10d1
FT		 1734 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1735 if (!schp->pages)
1da177e4 1736 return -ENOMEM;
1da177e4 1737 schp->sglist_len = sg_bufflen;
d6b10348 1738 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1739}
1740
1da177e4
LT		 1741static int
1742sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1743{
10db10d1 1744 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1745 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1746 int blk_size = buff_size, order;
1747 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4 1748
fb119935 1749 if (blk_size < 0)
1da177e4
LT		 1750 return -EFAULT;
1751 if (0 == blk_size)
1752 ++blk_size; /* don't know why */
b2ed6c69
FT		 1753 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1754 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1da177e4
LT		 1755 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1756 buff_size, blk_size));
d6b10348
MC		 1757
1758 /* N.B. ret_sz carried into this block ... */
1759 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1760 if (mx_sc_elems < 0)
1761 return mx_sc_elems; /* most likely -ENOMEM */
1762
6460e75a
DG		 1763 num = scatter_elem_sz;
1764 if (unlikely(num != scatter_elem_sz_prev)) {
1765 if (num < PAGE_SIZE) {
1766 scatter_elem_sz = PAGE_SIZE;
1767 scatter_elem_sz_prev = PAGE_SIZE;
1768 } else
1769 scatter_elem_sz_prev = num;
1770 }
10db10d1
FT		 1771
1772 if (sfp->low_dma)
1773 gfp_mask |= GFP_DMA;
1774
1775 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1776 gfp_mask |= __GFP_ZERO;
1777
1778 order = get_order(num);
1779retry:
1780 ret_sz = 1 << (PAGE_SHIFT + order);
1781
1782 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1783 k++, rem_sz -= ret_sz) {
1784
6460e75a 1785 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1786 scatter_elem_sz_prev : rem_sz;
1787
1788 schp->pages[k] = alloc_pages(gfp_mask, order);
1789 if (!schp->pages[k])
1790 goto out;
d6b10348 1791
6460e75a
DG		 1792 if (num == scatter_elem_sz_prev) {
1793 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1794 scatter_elem_sz = ret_sz;
1795 scatter_elem_sz_prev = ret_sz;
1796 }
1797 }
d6b10348 1798
7ca63cb4
DG		 1799 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1800 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1801 } /* end of for loop */
1802
10db10d1 1803 schp->page_order = order;
d6b10348 1804 schp->k_use_sg = k;
7ca63cb4
DG		 1805 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1806 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1807
1808 schp->bufflen = blk_size;
1809 if (rem_sz > 0) /* must have failed */
1810 return -ENOMEM;
1da177e4 1811 return 0;
10db10d1
FT		 1812out:
1813 for (i = 0; i < k; i++)
1814 __free_pages(schp->pages[k], order);
1815
1816 if (--order >= 0)
1817 goto retry;
1818
1819 return -ENOMEM;
1da177e4
LT		 1820}
1821
1da177e4
LT		 1822static void
1823sg_remove_scat(Sg_scatter_hold * schp)
1824{
1825 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1826 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1827 if (!schp->dio_in_use) {
1da177e4
LT		 1828 int k;
1829
10db10d1 1830 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1da177e4 1831 SCSI_LOG_TIMEOUT(5, printk(
10db10d1
FT		 1832 "sg_remove_scat: k=%d, pg=0x%p\n",
1833 k, schp->pages[k]));
1834 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1835 }
6e5a30cb 1836
10db10d1 1837 kfree(schp->pages);
1da177e4 1838 }
d6b10348 1839 }
1da177e4
LT		 1840 memset(schp, 0, sizeof (*schp));
1841}
1842
1da177e4
LT		 1843static int
1844sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1845{
1846 Sg_scatter_hold *schp = &srp->data;
d6b10348 1847 int k, num;
1da177e4
LT		 1848
1849 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1850 num_read_xfer));
1851 if ((!outp) || (num_read_xfer <= 0))
1852 return 0;
d6b10348 1853
10db10d1
FT		 1854 num = 1 << (PAGE_SHIFT + schp->page_order);
1855 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1856 if (num > num_read_xfer) {
10db10d1 1857 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1858 num_read_xfer))
1859 return -EFAULT;
1860 break;
1861 } else {
10db10d1 1862 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1863 num))
1864 return -EFAULT;
1865 num_read_xfer -= num;
1866 if (num_read_xfer <= 0)
1da177e4 1867 break;
d6b10348 1868 outp += num;
1da177e4 1869 }
1da177e4 1870 }
d6b10348 1871
1da177e4
LT		 1872 return 0;
1873}
1874
1875static void
1876sg_build_reserve(Sg_fd * sfp, int req_size)
1877{
1878 Sg_scatter_hold *schp = &sfp->reserve;
1879
1880 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1881 do {
1882 if (req_size < PAGE_SIZE)
1883 req_size = PAGE_SIZE;
1884 if (0 == sg_build_indirect(schp, sfp, req_size))
1885 return;
1886 else
1887 sg_remove_scat(schp);
1888 req_size >>= 1; /* divide by 2 */
1889 } while (req_size > (PAGE_SIZE / 2));
1890}
1891
1892static void
1893sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1894{
1895 Sg_scatter_hold *req_schp = &srp->data;
1896 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 1897 int k, num, rem;
1da177e4
LT		 1898
1899 srp->res_used = 1;
1900 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 1901 rem = size;
d6b10348 1902
10db10d1
FT		 1903 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1904 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 1905 if (rem <= num) {
d6b10348
MC		 1906 req_schp->k_use_sg = k + 1;
1907 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 1908 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 1909
1910 req_schp->bufflen = size;
10db10d1 1911 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 1912 break;
1913 } else
1914 rem -= num;
1da177e4 1915 }
d6b10348
MC		 1916
1917 if (k >= rsv_schp->k_use_sg)
1918 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 1919}
1920
1921static void
1922sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1923{
1924 Sg_scatter_hold *req_schp = &srp->data;
1da177e4
LT		 1925
1926 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1927 (int) req_schp->k_use_sg));
1da177e4
LT		 1928 req_schp->k_use_sg = 0;
1929 req_schp->bufflen = 0;
10db10d1
FT		 1930 req_schp->pages = NULL;
1931 req_schp->page_order = 0;
1da177e4
LT		 1932 req_schp->sglist_len = 0;
1933 sfp->save_scat_len = 0;
1934 srp->res_used = 0;
1935}
1936
1937static Sg_request *
1938sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1939{
1940 Sg_request *resp;
1941 unsigned long iflags;
1942
1943 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1944 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1945 /* look for requests that are ready + not SG_IO owned */
1946 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1947 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1948 resp->done = 2; /* guard against other readers */
1949 break;
1950 }
1951 }
1952 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1953 return resp;
1954}
1955
1da177e4
LT		 1956/* always adds to end of list */
1957static Sg_request *
1958sg_add_request(Sg_fd * sfp)
1959{
1960 int k;
1961 unsigned long iflags;
1962 Sg_request *resp;
1963 Sg_request *rp = sfp->req_arr;
1964
1965 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1966 resp = sfp->headrp;
1967 if (!resp) {
1968 memset(rp, 0, sizeof (Sg_request));
1969 rp->parentfp = sfp;
1970 resp = rp;
1971 sfp->headrp = resp;
1972 } else {
1973 if (0 == sfp->cmd_q)
1974 resp = NULL; /* command queuing disallowed */
1975 else {
1976 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
1977 if (!rp->parentfp)
1978 break;
1979 }
1980 if (k < SG_MAX_QUEUE) {
1981 memset(rp, 0, sizeof (Sg_request));
1982 rp->parentfp = sfp;
1983 while (resp->nextrp)
1984 resp = resp->nextrp;
1985 resp->nextrp = rp;
1986 resp = rp;
1987 } else
1988 resp = NULL;
1989 }
1990 }
1991 if (resp) {
1992 resp->nextrp = NULL;
cb59e840 1993 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 1994 }
1995 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1996 return resp;
1997}
1998
1999/* Return of 1 for found; 0 for not found */
2000static int
2001sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2002{
2003 Sg_request *prev_rp;
2004 Sg_request *rp;
2005 unsigned long iflags;
2006 int res = 0;
2007
2008 if ((!sfp) || (!srp) || (!sfp->headrp))
2009 return res;
2010 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2011 prev_rp = sfp->headrp;
2012 if (srp == prev_rp) {
2013 sfp->headrp = prev_rp->nextrp;
2014 prev_rp->parentfp = NULL;
2015 res = 1;
2016 } else {
2017 while ((rp = prev_rp->nextrp)) {
2018 if (srp == rp) {
2019 prev_rp->nextrp = rp->nextrp;
2020 rp->parentfp = NULL;
2021 res = 1;
2022 break;
2023 }
2024 prev_rp = rp;
2025 }
2026 }
2027 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2028 return res;
2029}
2030
1da177e4
LT		 2031static Sg_fd *
2032sg_add_sfp(Sg_device * sdp, int dev)
2033{
2034 Sg_fd *sfp;
2035 unsigned long iflags;
44ec9542 2036 int bufflen;
1da177e4 2037
d6b10348 2038 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4
LT		 2039 if (!sfp)
2040 return NULL;
d6b10348 2041
1da177e4
LT		 2042 init_waitqueue_head(&sfp->read_wait);
2043 rwlock_init(&sfp->rq_list_lock);
2044
c6517b79 2045 kref_init(&sfp->f_ref);
1da177e4
LT		 2046 sfp->timeout = SG_DEFAULT_TIMEOUT;
2047 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2048 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2049 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2050 sdp->device->host->unchecked_isa_dma : 1;
2051 sfp->cmd_q = SG_DEF_COMMAND_Q;
2052 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2053 sfp->parentdp = sdp;
7c07d613 2054 write_lock_irqsave(&sg_index_lock, iflags);
3442f802 2055 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
7c07d613 2056 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2057 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2058 if (unlikely(sg_big_buff != def_reserved_size))
2059 sg_big_buff = def_reserved_size;
2060
44ec9542 2061 bufflen = min_t(int, sg_big_buff,
ae03bf63 2062 queue_max_sectors(sdp->device->request_queue) * 512);
44ec9542 2063 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2064 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2065 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
c6517b79
TB		 2066
2067 kref_get(&sdp->d_ref);
2068 __module_get(THIS_MODULE);
1da177e4
LT		 2069 return sfp;
2070}
2071
c6517b79 2072static void sg_remove_sfp_usercontext(struct work_struct *work)
1da177e4 2073{
c6517b79
TB		 2074 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2075 struct sg_device *sdp = sfp->parentdp;
2076
2077 /* Cleanup any responses which were never read(). */
2078 while (sfp->headrp)
2079 sg_finish_rem_req(sfp->headrp);
1da177e4 2080
1da177e4 2081 if (sfp->reserve.bufflen > 0) {
c6517b79
TB		 2082 SCSI_LOG_TIMEOUT(6,
2083 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2084 (int) sfp->reserve.bufflen,
2085 (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2086 sg_remove_scat(&sfp->reserve);
2087 }
c6517b79
TB		 2088
2089 SCSI_LOG_TIMEOUT(6,
2090 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2091 sdp->disk->disk_name,
2092 sfp));
d6b10348 2093 kfree(sfp);
c6517b79
TB		 2094
2095 scsi_device_put(sdp->device);
2096 sg_put_dev(sdp);
2097 module_put(THIS_MODULE);
1da177e4
LT		 2098}
2099
c6517b79 2100static void sg_remove_sfp(struct kref *kref)
1da177e4 2101{
c6517b79
TB		 2102 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2103 struct sg_device *sdp = sfp->parentdp;
c6517b79 2104 unsigned long iflags;
1da177e4 2105
c6517b79 2106 write_lock_irqsave(&sg_index_lock, iflags);
3442f802 2107 list_del(&sfp->sfd_siblings);
c6517b79
TB		 2108 write_unlock_irqrestore(&sg_index_lock, iflags);
2109 wake_up_interruptible(&sdp->o_excl_wait);
1da177e4 2110
015640ed
FT		 2111 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2112 schedule_work(&sfp->ew.work);
1da177e4
LT		 2113}
2114
2115static int
2116sg_res_in_use(Sg_fd * sfp)
2117{
2118 const Sg_request *srp;
2119 unsigned long iflags;
2120
2121 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2122 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2123 if (srp->res_used)
2124 break;
2125 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2126 return srp ? 1 : 0;
2127}
2128
1da177e4 2129#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2130static int
2131sg_idr_max_id(int id, void *p, void *data)
2132{
2133 int *k = data;
2134
2135 if (*k < id)
2136 *k = id;
2137
2138 return 0;
2139}
2140
1da177e4
LT		 2141static int
2142sg_last_dev(void)
2143{
53474c04 2144 int k = -1;
1da177e4
LT		 2145 unsigned long iflags;
2146
7c07d613
JB		 2147 read_lock_irqsave(&sg_index_lock, iflags);
2148 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2149 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2150 return k + 1; /* origin 1 */
2151}
2152#endif
2153
c6517b79
TB		 2154/* must be called with sg_index_lock held */
2155static Sg_device *sg_lookup_dev(int dev)
1da177e4 2156{
c6517b79
TB		 2157 return idr_find(&sg_index_idr, dev);
2158}
1da177e4 2159
c6517b79
TB		 2160static Sg_device *sg_get_dev(int dev)
2161{
2162 struct sg_device *sdp;
2163 unsigned long flags;
2164
2165 read_lock_irqsave(&sg_index_lock, flags);
2166 sdp = sg_lookup_dev(dev);
2167 if (!sdp)
2168 sdp = ERR_PTR(-ENXIO);
2169 else if (sdp->detached) {
2170 /* If sdp->detached, then the refcount may already be 0, in
2171 * which case it would be a bug to do kref_get().
2172 */
2173 sdp = ERR_PTR(-ENODEV);
2174 } else
2175 kref_get(&sdp->d_ref);
2176 read_unlock_irqrestore(&sg_index_lock, flags);
7c07d613 2177
1da177e4
LT		 2178 return sdp;
2179}
2180
c6517b79
TB		 2181static void sg_put_dev(struct sg_device *sdp)
2182{
2183 kref_put(&sdp->d_ref, sg_device_destroy);
2184}
2185
1da177e4
LT		 2186#ifdef CONFIG_SCSI_PROC_FS
2187
2188static struct proc_dir_entry *sg_proc_sgp = NULL;
2189
2190static char sg_proc_sg_dirname[] = "scsi/sg";
2191
2192static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2193
2194static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2195static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2196 size_t count, loff_t *off);
2197static struct file_operations adio_fops = {
2198 /* .owner, .read and .llseek added in sg_proc_init() */
2199 .open = sg_proc_single_open_adio,
2200 .write = sg_proc_write_adio,
2201 .release = single_release,
2202};
2203
2204static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2205static ssize_t sg_proc_write_dressz(struct file *filp,
2206 const char __user *buffer, size_t count, loff_t *off);
2207static struct file_operations dressz_fops = {
2208 .open = sg_proc_single_open_dressz,
2209 .write = sg_proc_write_dressz,
2210 .release = single_release,
2211};
2212
2213static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2214static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2215static struct file_operations version_fops = {
2216 .open = sg_proc_single_open_version,
2217 .release = single_release,
2218};
2219
2220static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2221static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2222static struct file_operations devhdr_fops = {
2223 .open = sg_proc_single_open_devhdr,
2224 .release = single_release,
2225};
2226
2227static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2228static int sg_proc_open_dev(struct inode *inode, struct file *file);
2229static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2230static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2231static void dev_seq_stop(struct seq_file *s, void *v);
2232static struct file_operations dev_fops = {
2233 .open = sg_proc_open_dev,
2234 .release = seq_release,
2235};
2236static struct seq_operations dev_seq_ops = {
2237 .start = dev_seq_start,
2238 .next = dev_seq_next,
2239 .stop = dev_seq_stop,
2240 .show = sg_proc_seq_show_dev,
2241};
2242
2243static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2244static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2245static struct file_operations devstrs_fops = {
2246 .open = sg_proc_open_devstrs,
2247 .release = seq_release,
2248};
2249static struct seq_operations devstrs_seq_ops = {
2250 .start = dev_seq_start,
2251 .next = dev_seq_next,
2252 .stop = dev_seq_stop,
2253 .show = sg_proc_seq_show_devstrs,
2254};
2255
2256static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2257static int sg_proc_open_debug(struct inode *inode, struct file *file);
2258static struct file_operations debug_fops = {
2259 .open = sg_proc_open_debug,
2260 .release = seq_release,
2261};
2262static struct seq_operations debug_seq_ops = {
2263 .start = dev_seq_start,
2264 .next = dev_seq_next,
2265 .stop = dev_seq_stop,
2266 .show = sg_proc_seq_show_debug,
2267};
2268
2269
2270struct sg_proc_leaf {
2271 const char * name;
2272 struct file_operations * fops;
2273};
2274
2275static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2276 {"allow_dio", &adio_fops},
2277 {"debug", &debug_fops},
2278 {"def_reserved_size", &dressz_fops},
2279 {"device_hdr", &devhdr_fops},
2280 {"devices", &dev_fops},
2281 {"device_strs", &devstrs_fops},
2282 {"version", &version_fops}
2283};
2284
2285static int
2286sg_proc_init(void)
2287{
2288 int k, mask;
6391a113 2289 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2290 struct sg_proc_leaf * leaf;
2291
66600221 2292 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2293 if (!sg_proc_sgp)
2294 return 1;
2295 for (k = 0; k < num_leaves; ++k) {
2296 leaf = &sg_proc_leaf_arr[k];
2297 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f
DL		 2298 leaf->fops->owner = THIS_MODULE;
2299 leaf->fops->read = seq_read;
2300 leaf->fops->llseek = seq_lseek;
2301 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2302 }
2303 return 0;
2304}
2305
2306static void
2307sg_proc_cleanup(void)
2308{
2309 int k;
6391a113 2310 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2311
2312 if (!sg_proc_sgp)
2313 return;
2314 for (k = 0; k < num_leaves; ++k)
2315 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2316 remove_proc_entry(sg_proc_sg_dirname, NULL);
2317}
2318
2319
2320static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2321{
2322 seq_printf(s, "%d\n", *((int *)s->private));
2323 return 0;
2324}
2325
2326static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2327{
2328 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2329}
2330
2331static ssize_t
2332sg_proc_write_adio(struct file *filp, const char __user *buffer,
2333 size_t count, loff_t *off)
2334{
2335 int num;
2336 char buff[11];
2337
2338 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2339 return -EACCES;
2340 num = (count < 10) ? count : 10;
2341 if (copy_from_user(buff, buffer, num))
2342 return -EFAULT;
2343 buff[num] = '\0';
2344 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2345 return count;
2346}
2347
2348static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2349{
2350 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2351}
2352
2353static ssize_t
2354sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2355 size_t count, loff_t *off)
2356{
2357 int num;
2358 unsigned long k = ULONG_MAX;
2359 char buff[11];
2360
2361 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2362 return -EACCES;
2363 num = (count < 10) ? count : 10;
2364 if (copy_from_user(buff, buffer, num))
2365 return -EFAULT;
2366 buff[num] = '\0';
2367 k = simple_strtoul(buff, NULL, 10);
2368 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2369 sg_big_buff = k;
2370 return count;
2371 }
2372 return -ERANGE;
2373}
2374
2375static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2376{
2377 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2378 sg_version_date);
2379 return 0;
2380}
2381
2382static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2383{
2384 return single_open(file, sg_proc_seq_show_version, NULL);
2385}
2386
2387static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2388{
2389 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2390 "online\n");
2391 return 0;
2392}
2393
2394static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2395{
2396 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2397}
2398
2399struct sg_proc_deviter {
2400 loff_t index;
2401 size_t max;
2402};
2403
2404static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2405{
2406 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2407
729d70f5 2408 s->private = it;
1da177e4
LT		 2409 if (! it)
2410 return NULL;
729d70f5 2411
1da177e4
LT		 2412 it->index = *pos;
2413 it->max = sg_last_dev();
2414 if (it->index >= it->max)
729d70f5 2415 return NULL;
1da177e4 2416 return it;
1da177e4
LT		 2417}
2418
2419static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2420{
729d70f5 2421 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2422
2423 *pos = ++it->index;
2424 return (it->index < it->max) ? it : NULL;
2425}
2426
2427static void dev_seq_stop(struct seq_file *s, void *v)
2428{
729d70f5 2429 kfree(s->private);
1da177e4
LT		 2430}
2431
2432static int sg_proc_open_dev(struct inode *inode, struct file *file)
2433{
2434 return seq_open(file, &dev_seq_ops);
2435}
2436
2437static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2438{
2439 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2440 Sg_device *sdp;
2441 struct scsi_device *scsidp;
c6517b79 2442 unsigned long iflags;
1da177e4 2443
c6517b79
TB		 2444 read_lock_irqsave(&sg_index_lock, iflags);
2445 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2446 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2447 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2448 scsidp->host->host_no, scsidp->channel,
2449 scsidp->id, scsidp->lun, (int) scsidp->type,
2450 1,
2451 (int) scsidp->queue_depth,
2452 (int) scsidp->device_busy,
2453 (int) scsi_device_online(scsidp));
2454 else
2455 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
c6517b79 2456 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2457 return 0;
2458}
2459
2460static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2461{
2462 return seq_open(file, &devstrs_seq_ops);
2463}
2464
2465static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2466{
2467 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2468 Sg_device *sdp;
2469 struct scsi_device *scsidp;
c6517b79 2470 unsigned long iflags;
1da177e4 2471
c6517b79
TB		 2472 read_lock_irqsave(&sg_index_lock, iflags);
2473 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2474 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2475 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2476 scsidp->vendor, scsidp->model, scsidp->rev);
2477 else
2478 seq_printf(s, "<no active device>\n");
c6517b79 2479 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2480 return 0;
2481}
2482
c6517b79 2483/* must be called while holding sg_index_lock */
1da177e4
LT		 2484static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2485{
2486 int k, m, new_interface, blen, usg;
2487 Sg_request *srp;
2488 Sg_fd *fp;
2489 const sg_io_hdr_t *hp;
2490 const char * cp;
cb59e840 2491 unsigned int ms;
1da177e4 2492
3442f802
FT		 2493 k = 0;
2494 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2495 k++;
c6517b79 2496 read_lock(&fp->rq_list_lock); /* irqs already disabled */
1da177e4 2497 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3442f802 2498 "(res)sgat=%d low_dma=%d\n", k,
1da177e4
LT		 2499 jiffies_to_msecs(fp->timeout),
2500 fp->reserve.bufflen,
2501 (int) fp->reserve.k_use_sg,
2502 (int) fp->low_dma);
2503 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2504 (int) fp->cmd_q, (int) fp->force_packid,
2505 (int) fp->keep_orphan, (int) fp->closed);
c6517b79
TB		 2506 for (m = 0, srp = fp->headrp;
2507 srp != NULL;
2508 ++m, srp = srp->nextrp) {
1da177e4
LT		 2509 hp = &srp->header;
2510 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2511 if (srp->res_used) {
2512 if (new_interface &&
2513 (SG_FLAG_MMAP_IO & hp->flags))
2514 cp = " mmap>> ";
2515 else
2516 cp = " rb>> ";
2517 } else {
2518 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2519 cp = " dio>> ";
2520 else
2521 cp = " ";
2522 }
2523 seq_printf(s, cp);
d6b10348
MC		 2524 blen = srp->data.bufflen;
2525 usg = srp->data.k_use_sg;
1da177e4
LT		 2526 seq_printf(s, srp->done ?
2527 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2528 : "act:");
1da177e4
LT		 2529 seq_printf(s, " id=%d blen=%d",
2530 srp->header.pack_id, blen);
2531 if (srp->done)
2532 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 2533 else {
2534 ms = jiffies_to_msecs(jiffies);
1da177e4 2535 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 2536 (new_interface ? hp->timeout :
2537 jiffies_to_msecs(fp->timeout)),
2538 (ms > hp->duration ? ms - hp->duration : 0));
2539 }
1da177e4
LT		 2540 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2541 (int) srp->data.cmd_opcode);
2542 }
2543 if (0 == m)
2544 seq_printf(s, " No requests active\n");
c6517b79 2545 read_unlock(&fp->rq_list_lock);
1da177e4
LT		 2546 }
2547}
2548
2549static int sg_proc_open_debug(struct inode *inode, struct file *file)
2550{
2551 return seq_open(file, &debug_seq_ops);
2552}
2553
2554static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2555{
2556 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2557 Sg_device *sdp;
c6517b79 2558 unsigned long iflags;
1da177e4
LT		 2559
2560 if (it && (0 == it->index)) {
7c07d613
JB		 2561 seq_printf(s, "max_active_device=%d(origin 1)\n",
2562 (int)it->max);
1da177e4
LT		 2563 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2564 }
1da177e4 2565
c6517b79
TB		 2566 read_lock_irqsave(&sg_index_lock, iflags);
2567 sdp = it ? sg_lookup_dev(it->index) : NULL;
3442f802 2568 if (sdp && !list_empty(&sdp->sfds)) {
c6517b79 2569 struct scsi_device *scsidp = sdp->device;
1da177e4 2570
c6517b79
TB		 2571 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2572 if (sdp->detached)
2573 seq_printf(s, "detached pending close ");
2574 else
2575 seq_printf
2576 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2577 scsidp->host->host_no,
2578 scsidp->channel, scsidp->id,
2579 scsidp->lun,
2580 scsidp->host->hostt->emulated);
2581 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2582 sdp->sg_tablesize, sdp->exclude);
1da177e4
LT		 2583 sg_proc_debug_helper(s, sdp);
2584 }
c6517b79 2585 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2586 return 0;
2587}
2588
2589#endif /* CONFIG_SCSI_PROC_FS */
2590
2591module_init(init_sg);
2592module_exit(exit_sg);
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