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[SCSI] sd: limit the scope of the async probe domain
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / sg.c
CommitLineData
1da177e4
LT		 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
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 (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 */
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>
5a0e3ad6 41#include <linux/slab.h>
1da177e4
LT		 42#include <linux/fcntl.h>
43#include <linux/init.h>
44#include <linux/poll.h>
1da177e4 45#include <linux/moduleparam.h>
1da177e4 46#include <linux/cdev.h>
7c07d613 47#include <linux/idr.h>
1da177e4
LT		 48#include <linux/seq_file.h>
49#include <linux/blkdev.h>
50#include <linux/delay.h>
6da127ad 51#include <linux/blktrace_api.h>
c45d15d2 52#include <linux/mutex.h>
2fe038e3 53#include <linux/ratelimit.h>
1da177e4
LT		 54
55#include "scsi.h"
db9dff36 56#include <scsi/scsi_dbg.h>
1da177e4
LT		 57#include <scsi/scsi_host.h>
58#include <scsi/scsi_driver.h>
59#include <scsi/scsi_ioctl.h>
60#include <scsi/sg.h>
61
62#include "scsi_logging.h"
63
64#ifdef CONFIG_SCSI_PROC_FS
65#include <linux/proc_fs.h>
7ca63cb4 66static char *sg_version_date = "20061027";
1da177e4
LT		 67
68static int sg_proc_init(void);
69static void sg_proc_cleanup(void);
70#endif
71
1da177e4 72#define SG_ALLOW_DIO_DEF 0
1da177e4
LT		 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
89int 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).] */
96static int def_reserved_size = -1; /* picks up init parameter */
97static int sg_allow_dio = SG_ALLOW_DIO_DEF;
98
6460e75a
DG		 99static int scatter_elem_sz = SG_SCATTER_SZ;
100static int scatter_elem_sz_prev = SG_SCATTER_SZ;
101
1da177e4 102#define SG_SECTOR_SZ 512
1da177e4 103
ee959b00
TJ		 104static int sg_add(struct device *, struct class_interface *);
105static void sg_remove(struct device *, struct class_interface *);
1da177e4 106
c45d15d2
AB		 107static DEFINE_MUTEX(sg_mutex);
108
7c07d613
JB		 109static DEFINE_IDR(sg_index_idr);
110static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
1da177e4
LT		 111 file descriptor list for device */
112
113static struct class_interface sg_interface = {
ee959b00
TJ		 114 .add_dev = sg_add,
115 .remove_dev = sg_remove,
1da177e4
LT		 116};
117
118typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
119 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 120 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4 121 unsigned bufflen; /* Size of (aggregate) data buffer */
10db10d1
FT		 122 struct page **pages;
123 int page_order;
1da177e4
LT		 124 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
125 unsigned char cmd_opcode; /* first byte of command */
126} Sg_scatter_hold;
127
128struct sg_device; /* forward declarations */
129struct sg_fd;
130
131typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 132 struct sg_request *nextrp; /* NULL -> tail request (slist) */
133 struct sg_fd *parentfp; /* NULL -> not in use */
134 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
135 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 136 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 137 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
138 char orphan; /* 1 -> drop on sight, 0 -> normal */
139 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
140 volatile char done; /* 0->before bh, 1->before read, 2->read */
10865dfa 141 struct request *rq;
6e5a30cb 142 struct bio *bio;
c96952ed 143 struct execute_work ew;
1da177e4
LT		 144} Sg_request;
145
146typedef struct sg_fd { /* holds the state of a file descriptor */
3442f802 147 struct list_head sfd_siblings;
1da177e4
LT		 148 struct sg_device *parentdp; /* owning device */
149 wait_queue_head_t read_wait; /* queue read until command done */
150 rwlock_t rq_list_lock; /* protect access to list in req_arr */
151 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
152 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
153 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
154 unsigned save_scat_len; /* original length of trunc. scat. element */
155 Sg_request *headrp; /* head of request slist, NULL->empty */
156 struct fasync_struct *async_qp; /* used by asynchronous notification */
157 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
158 char low_dma; /* as in parent but possibly overridden to 1 */
159 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
160 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
161 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
162 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
163 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
164 char mmap_called; /* 0 -> mmap() never called on this fd */
c6517b79
TB		 165 struct kref f_ref;
166 struct execute_work ew;
1da177e4
LT		 167} Sg_fd;
168
169typedef struct sg_device { /* holds the state of each scsi generic device */
170 struct scsi_device *device;
171 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
172 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 173 u32 index; /* device index number */
3442f802 174 struct list_head sfds;
1da177e4
LT		 175 volatile char detached; /* 0->attached, 1->detached pending removal */
176 volatile char exclude; /* opened for exclusive access */
177 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
178 struct gendisk *disk;
179 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
c6517b79 180 struct kref d_ref;
1da177e4
LT		 181} Sg_device;
182
d6b10348 183/* tasklet or soft irq callback */
a91a3a20 184static void sg_rq_end_io(struct request *rq, int uptodate);
10865dfa 185static int sg_start_req(Sg_request *srp, unsigned char *cmd);
e7ee4cc0 186static int sg_finish_rem_req(Sg_request * srp);
1da177e4 187static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
1da177e4
LT		 188static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
189 Sg_request * srp);
0b07de85
AG		 190static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
191 const char __user *buf, size_t count, int blocking,
a2dd3b4c 192 int read_only, int sg_io_owned, Sg_request **o_srp);
1da177e4
LT		 193static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
194 unsigned char *cmnd, int timeout, int blocking);
1da177e4
LT		 195static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
196static void sg_remove_scat(Sg_scatter_hold * schp);
197static void sg_build_reserve(Sg_fd * sfp, int req_size);
198static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
199static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
1da177e4 200static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
c6517b79 201static void sg_remove_sfp(struct kref *);
1da177e4
LT		 202static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
203static Sg_request *sg_add_request(Sg_fd * sfp);
204static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
205static int sg_res_in_use(Sg_fd * sfp);
1da177e4 206static Sg_device *sg_get_dev(int dev);
c6517b79 207static void sg_put_dev(Sg_device *sdp);
1da177e4 208
1da177e4
LT		 209#define SZ_SG_HEADER sizeof(struct sg_header)
210#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
211#define SZ_SG_IOVEC sizeof(sg_iovec_t)
212#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
213
14e507b8
FT		 214static int sg_allow_access(struct file *filp, unsigned char *cmd)
215{
35df8397 216 struct sg_fd *sfp = filp->private_data;
14e507b8
FT		 217
218 if (sfp->parentdp->device->type == TYPE_SCANNER)
219 return 0;
220
018e0446 221 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
14e507b8
FT		 222}
223
1da177e4
LT		 224static int
225sg_open(struct inode *inode, struct file *filp)
226{
227 int dev = iminor(inode);
228 int flags = filp->f_flags;
d6b10348 229 struct request_queue *q;
1da177e4
LT		 230 Sg_device *sdp;
231 Sg_fd *sfp;
232 int res;
233 int retval;
234
c45d15d2 235 mutex_lock(&sg_mutex);
1da177e4
LT		 236 nonseekable_open(inode, filp);
237 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
238 sdp = sg_get_dev(dev);
c6517b79
TB		 239 if (IS_ERR(sdp)) {
240 retval = PTR_ERR(sdp);
241 sdp = NULL;
242 goto sg_put;
eb09d3d4 243 }
1da177e4
LT		 244
245 /* This driver's module count bumped by fops_get in <linux/fs.h> */
246 /* Prevent the device driver from vanishing while we sleep */
247 retval = scsi_device_get(sdp->device);
c6517b79
TB		 248 if (retval)
249 goto sg_put;
1da177e4 250
bc4f2401
AS		 251 retval = scsi_autopm_get_device(sdp->device);
252 if (retval)
253 goto sdp_put;
254
1da177e4
LT		 255 if (!((flags & O_NONBLOCK) ||
256 scsi_block_when_processing_errors(sdp->device))) {
257 retval = -ENXIO;
258 /* we are in error recovery for this device */
259 goto error_out;
260 }
261
262 if (flags & O_EXCL) {
263 if (O_RDONLY == (flags & O_ACCMODE)) {
264 retval = -EPERM; /* Can't lock it with read only access */
265 goto error_out;
266 }
3442f802 267 if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) {
1da177e4
LT		 268 retval = -EBUSY;
269 goto error_out;
270 }
271 res = 0;
272 __wait_event_interruptible(sdp->o_excl_wait,
3442f802 273 ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
1da177e4
LT		 274 if (res) {
275 retval = res; /* -ERESTARTSYS because signal hit process */
276 goto error_out;
277 }
278 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
279 if (flags & O_NONBLOCK) {
280 retval = -EBUSY;
281 goto error_out;
282 }
283 res = 0;
284 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
285 res);
286 if (res) {
287 retval = res; /* -ERESTARTSYS because signal hit process */
288 goto error_out;
289 }
290 }
291 if (sdp->detached) {
292 retval = -ENODEV;
293 goto error_out;
294 }
3442f802 295 if (list_empty(&sdp->sfds)) { /* no existing opens on this device */
1da177e4 296 sdp->sgdebug = 0;
d6b10348 297 q = sdp->device->request_queue;
8a78362c 298 sdp->sg_tablesize = queue_max_segments(q);
1da177e4
LT		 299 }
300 if ((sfp = sg_add_sfp(sdp, dev)))
301 filp->private_data = sfp;
302 else {
c6517b79 303 if (flags & O_EXCL) {
1da177e4 304 sdp->exclude = 0; /* undo if error */
c6517b79
TB		 305 wake_up_interruptible(&sdp->o_excl_wait);
306 }
1da177e4
LT		 307 retval = -ENOMEM;
308 goto error_out;
309 }
c6517b79
TB		 310 retval = 0;
311error_out:
bc4f2401
AS		 312 if (retval) {
313 scsi_autopm_put_device(sdp->device);
314sdp_put:
c6517b79 315 scsi_device_put(sdp->device);
bc4f2401 316 }
c6517b79
TB		 317sg_put:
318 if (sdp)
319 sg_put_dev(sdp);
c45d15d2 320 mutex_unlock(&sg_mutex);
1da177e4
LT		 321 return retval;
322}
323
324/* Following function was formerly called 'sg_close' */
325static int
326sg_release(struct inode *inode, struct file *filp)
327{
328 Sg_device *sdp;
329 Sg_fd *sfp;
330
331 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
332 return -ENXIO;
333 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
c6517b79
TB		 334
335 sfp->closed = 1;
336
337 sdp->exclude = 0;
338 wake_up_interruptible(&sdp->o_excl_wait);
339
bc4f2401 340 scsi_autopm_put_device(sdp->device);
c6517b79 341 kref_put(&sfp->f_ref, sg_remove_sfp);
1da177e4
LT		 342 return 0;
343}
344
345static ssize_t
346sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
347{
1da177e4
LT		 348 Sg_device *sdp;
349 Sg_fd *sfp;
350 Sg_request *srp;
351 int req_pack_id = -1;
1da177e4 352 sg_io_hdr_t *hp;
cb59e840
DG		 353 struct sg_header *old_hdr = NULL;
354 int retval = 0;
1da177e4
LT		 355
356 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
357 return -ENXIO;
358 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
359 sdp->disk->disk_name, (int) count));
d6b10348 360
1da177e4
LT		 361 if (!access_ok(VERIFY_WRITE, buf, count))
362 return -EFAULT;
363 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840
DG		 364 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
365 if (!old_hdr)
366 return -ENOMEM;
367 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
368 retval = -EFAULT;
369 goto free_old_hdr;
370 }
371 if (old_hdr->reply_len < 0) {
1da177e4 372 if (count >= SZ_SG_IO_HDR) {
cb59e840
DG		 373 sg_io_hdr_t *new_hdr;
374 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
375 if (!new_hdr) {
376 retval = -ENOMEM;
377 goto free_old_hdr;
378 }
379 retval =__copy_from_user
380 (new_hdr, buf, SZ_SG_IO_HDR);
381 req_pack_id = new_hdr->pack_id;
382 kfree(new_hdr);
383 if (retval) {
384 retval = -EFAULT;
385 goto free_old_hdr;
386 }
1da177e4
LT		 387 }
388 } else
cb59e840 389 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 390 }
391 srp = sg_get_rq_mark(sfp, req_pack_id);
392 if (!srp) { /* now wait on packet to arrive */
cb59e840
DG		 393 if (sdp->detached) {
394 retval = -ENODEV;
395 goto free_old_hdr;
396 }
397 if (filp->f_flags & O_NONBLOCK) {
398 retval = -EAGAIN;
399 goto free_old_hdr;
400 }
1da177e4 401 while (1) {
cb59e840 402 retval = 0; /* following macro beats race condition */
1da177e4 403 __wait_event_interruptible(sfp->read_wait,
cb59e840
DG		 404 (sdp->detached ||
405 (srp = sg_get_rq_mark(sfp, req_pack_id))),
406 retval);
407 if (sdp->detached) {
408 retval = -ENODEV;
409 goto free_old_hdr;
410 }
411 if (0 == retval)
1da177e4 412 break;
cb59e840
DG		 413
414 /* -ERESTARTSYS as signal hit process */
415 goto free_old_hdr;
1da177e4
LT		 416 }
417 }
cb59e840
DG		 418 if (srp->header.interface_id != '\0') {
419 retval = sg_new_read(sfp, buf, count, srp);
420 goto free_old_hdr;
421 }
1da177e4
LT		 422
423 hp = &srp->header;
cb59e840
DG		 424 if (old_hdr == NULL) {
425 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
426 if (! old_hdr) {
427 retval = -ENOMEM;
428 goto free_old_hdr;
429 }
430 }
431 memset(old_hdr, 0, SZ_SG_HEADER);
432 old_hdr->reply_len = (int) hp->timeout;
433 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
434 old_hdr->pack_id = hp->pack_id;
435 old_hdr->twelve_byte =
1da177e4 436 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840
DG		 437 old_hdr->target_status = hp->masked_status;
438 old_hdr->host_status = hp->host_status;
439 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 440 if ((CHECK_CONDITION & hp->masked_status) ||
441 (DRIVER_SENSE & hp->driver_status))
cb59e840
DG		 442 memcpy(old_hdr->sense_buffer, srp->sense_b,
443 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 444 switch (hp->host_status) {
445 /* This setup of 'result' is for backward compatibility and is best
446 ignored by the user who should use target, host + driver status */
447 case DID_OK:
448 case DID_PASSTHROUGH:
449 case DID_SOFT_ERROR:
cb59e840 450 old_hdr->result = 0;
1da177e4
LT		 451 break;
452 case DID_NO_CONNECT:
453 case DID_BUS_BUSY:
454 case DID_TIME_OUT:
cb59e840 455 old_hdr->result = EBUSY;
1da177e4
LT		 456 break;
457 case DID_BAD_TARGET:
458 case DID_ABORT:
459 case DID_PARITY:
460 case DID_RESET:
461 case DID_BAD_INTR:
cb59e840 462 old_hdr->result = EIO;
1da177e4
LT		 463 break;
464 case DID_ERROR:
cb59e840 465 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 466 hp->masked_status == GOOD) ? 0 : EIO;
467 break;
468 default:
cb59e840 469 old_hdr->result = EIO;
1da177e4
LT		 470 break;
471 }
472
473 /* Now copy the result back to the user buffer. */
474 if (count >= SZ_SG_HEADER) {
cb59e840
DG		 475 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
476 retval = -EFAULT;
477 goto free_old_hdr;
478 }
1da177e4 479 buf += SZ_SG_HEADER;
cb59e840
DG		 480 if (count > old_hdr->reply_len)
481 count = old_hdr->reply_len;
1da177e4 482 if (count > SZ_SG_HEADER) {
cb59e840
DG		 483 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
484 retval = -EFAULT;
485 goto free_old_hdr;
486 }
1da177e4
LT		 487 }
488 } else
cb59e840 489 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 490 sg_finish_rem_req(srp);
cb59e840
DG		 491 retval = count;
492free_old_hdr:
c9475cb0 493 kfree(old_hdr);
cb59e840 494 return retval;
1da177e4
LT		 495}
496
497static ssize_t
498sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
499{
500 sg_io_hdr_t *hp = &srp->header;
501 int err = 0;
502 int len;
503
504 if (count < SZ_SG_IO_HDR) {
505 err = -EINVAL;
506 goto err_out;
507 }
508 hp->sb_len_wr = 0;
509 if ((hp->mx_sb_len > 0) && hp->sbp) {
510 if ((CHECK_CONDITION & hp->masked_status) ||
511 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 512 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 513 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
514 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
515 len = (len > sb_len) ? sb_len : len;
516 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
517 err = -EFAULT;
518 goto err_out;
519 }
520 hp->sb_len_wr = len;
521 }
522 }
523 if (hp->masked_status || hp->host_status || hp->driver_status)
524 hp->info |= SG_INFO_CHECK;
525 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
526 err = -EFAULT;
527 goto err_out;
528 }
0b6cb26c 529err_out:
e7ee4cc0 530 err = sg_finish_rem_req(srp);
1da177e4
LT		 531 return (0 == err) ? count : err;
532}
533
534static ssize_t
535sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
536{
537 int mxsize, cmd_size, k;
538 int input_size, blocking;
539 unsigned char opcode;
540 Sg_device *sdp;
541 Sg_fd *sfp;
542 Sg_request *srp;
543 struct sg_header old_hdr;
544 sg_io_hdr_t *hp;
d6b10348 545 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 546
547 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
548 return -ENXIO;
549 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
550 sdp->disk->disk_name, (int) count));
551 if (sdp->detached)
552 return -ENODEV;
553 if (!((filp->f_flags & O_NONBLOCK) ||
554 scsi_block_when_processing_errors(sdp->device)))
555 return -ENXIO;
556
557 if (!access_ok(VERIFY_READ, buf, count))
558 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
559 if (count < SZ_SG_HEADER)
560 return -EIO;
561 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
562 return -EFAULT;
563 blocking = !(filp->f_flags & O_NONBLOCK);
564 if (old_hdr.reply_len < 0)
a2dd3b4c
TB		 565 return sg_new_write(sfp, filp, buf, count,
566 blocking, 0, 0, NULL);
1da177e4
LT		 567 if (count < (SZ_SG_HEADER + 6))
568 return -EIO; /* The minimum scsi command length is 6 bytes. */
569
570 if (!(srp = sg_add_request(sfp))) {
571 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
572 return -EDOM;
573 }
574 buf += SZ_SG_HEADER;
575 __get_user(opcode, buf);
576 if (sfp->next_cmd_len > 0) {
577 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
578 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
579 sfp->next_cmd_len = 0;
580 sg_remove_request(sfp, srp);
581 return -EIO;
582 }
583 cmd_size = sfp->next_cmd_len;
584 sfp->next_cmd_len = 0; /* reset so only this write() effected */
585 } else {
586 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
587 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
588 cmd_size = 12;
589 }
590 SCSI_LOG_TIMEOUT(4, printk(
591 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
592/* Determine buffer size. */
593 input_size = count - cmd_size;
594 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
595 mxsize -= SZ_SG_HEADER;
596 input_size -= SZ_SG_HEADER;
597 if (input_size < 0) {
598 sg_remove_request(sfp, srp);
599 return -EIO; /* User did not pass enough bytes for this command. */
600 }
601 hp = &srp->header;
602 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
603 hp->cmd_len = (unsigned char) cmd_size;
604 hp->iovec_count = 0;
605 hp->mx_sb_len = 0;
606 if (input_size > 0)
607 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
608 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
609 else
610 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
611 hp->dxfer_len = mxsize;
fad7f01e
FT		 612 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
613 hp->dxferp = (char __user *)buf + cmd_size;
614 else
615 hp->dxferp = NULL;
1da177e4
LT		 616 hp->sbp = NULL;
617 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
618 hp->flags = input_size; /* structure abuse ... */
619 hp->pack_id = old_hdr.pack_id;
620 hp->usr_ptr = NULL;
621 if (__copy_from_user(cmnd, buf, cmd_size))
622 return -EFAULT;
623 /*
624 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
625 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
626 * is a non-zero input_size, so emit a warning.
627 */
eaa3e22e
AK		 628 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
629 static char cmd[TASK_COMM_LEN];
2fe038e3
CD		 630 if (strcmp(current->comm, cmd)) {
631 printk_ratelimited(KERN_WARNING
632 "sg_write: data in/out %d/%d bytes "
633 "for SCSI command 0x%x-- guessing "
634 "data in;\n program %s not setting "
635 "count and/or reply_len properly\n",
636 old_hdr.reply_len - (int)SZ_SG_HEADER,
637 input_size, (unsigned int) cmnd[0],
638 current->comm);
eaa3e22e
AK		 639 strcpy(cmd, current->comm);
640 }
641 }
1da177e4
LT		 642 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
643 return (k < 0) ? k : count;
644}
645
646static ssize_t
0b07de85 647sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
a2dd3b4c 648 size_t count, int blocking, int read_only, int sg_io_owned,
0b07de85 649 Sg_request **o_srp)
1da177e4
LT		 650{
651 int k;
652 Sg_request *srp;
653 sg_io_hdr_t *hp;
d6b10348 654 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 655 int timeout;
656 unsigned long ul_timeout;
657
658 if (count < SZ_SG_IO_HDR)
659 return -EINVAL;
660 if (!access_ok(VERIFY_READ, buf, count))
661 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
662
663 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
664 if (!(srp = sg_add_request(sfp))) {
665 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
666 return -EDOM;
667 }
a2dd3b4c 668 srp->sg_io_owned = sg_io_owned;
1da177e4
LT		 669 hp = &srp->header;
670 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
671 sg_remove_request(sfp, srp);
672 return -EFAULT;
673 }
674 if (hp->interface_id != 'S') {
675 sg_remove_request(sfp, srp);
676 return -ENOSYS;
677 }
678 if (hp->flags & SG_FLAG_MMAP_IO) {
679 if (hp->dxfer_len > sfp->reserve.bufflen) {
680 sg_remove_request(sfp, srp);
681 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
682 }
683 if (hp->flags & SG_FLAG_DIRECT_IO) {
684 sg_remove_request(sfp, srp);
685 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
686 }
687 if (sg_res_in_use(sfp)) {
688 sg_remove_request(sfp, srp);
689 return -EBUSY; /* reserve buffer already being used */
690 }
691 }
692 ul_timeout = msecs_to_jiffies(srp->header.timeout);
693 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
694 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
695 sg_remove_request(sfp, srp);
696 return -EMSGSIZE;
697 }
698 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
699 sg_remove_request(sfp, srp);
700 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
701 }
702 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
703 sg_remove_request(sfp, srp);
704 return -EFAULT;
705 }
14e507b8 706 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 707 sg_remove_request(sfp, srp);
708 return -EPERM;
709 }
710 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
711 if (k < 0)
712 return k;
713 if (o_srp)
714 *o_srp = srp;
715 return count;
716}
717
718static int
719sg_common_write(Sg_fd * sfp, Sg_request * srp,
720 unsigned char *cmnd, int timeout, int blocking)
721{
d6b10348 722 int k, data_dir;
1da177e4
LT		 723 Sg_device *sdp = sfp->parentdp;
724 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 725
726 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
727 hp->status = 0;
728 hp->masked_status = 0;
729 hp->msg_status = 0;
730 hp->info = 0;
731 hp->host_status = 0;
732 hp->driver_status = 0;
733 hp->resid = 0;
734 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
735 (int) cmnd[0], (int) hp->cmd_len));
736
10865dfa
FT		 737 k = sg_start_req(srp, cmnd);
738 if (k) {
7ca63cb4 739 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 740 sg_finish_rem_req(srp);
741 return k; /* probably out of space --> ENOMEM */
742 }
1da177e4 743 if (sdp->detached) {
caf19d38
FT		 744 if (srp->bio)
745 blk_end_request_all(srp->rq, -EIO);
1da177e4
LT		 746 sg_finish_rem_req(srp);
747 return -ENODEV;
748 }
1da177e4 749
1da177e4
LT		 750 switch (hp->dxfer_direction) {
751 case SG_DXFER_TO_FROM_DEV:
752 case SG_DXFER_FROM_DEV:
d6b10348 753 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 754 break;
755 case SG_DXFER_TO_DEV:
d6b10348 756 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 757 break;
758 case SG_DXFER_UNKNOWN:
d6b10348 759 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 760 break;
761 default:
d6b10348 762 data_dir = DMA_NONE;
1da177e4
LT		 763 break;
764 }
cb59e840 765 hp->duration = jiffies_to_msecs(jiffies);
10db10d1
FT		 766
767 srp->rq->timeout = timeout;
c6517b79 768 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
10db10d1
FT		 769 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
770 srp->rq, 1, sg_rq_end_io);
771 return 0;
1da177e4
LT		 772}
773
1da177e4 774static int
f4927c45 775sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 776{
777 void __user *p = (void __user *)arg;
778 int __user *ip = p;
779 int result, val, read_only;
780 Sg_device *sdp;
781 Sg_fd *sfp;
782 Sg_request *srp;
783 unsigned long iflags;
784
785 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
786 return -ENXIO;
abf54393 787
1da177e4
LT		 788 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
789 sdp->disk->disk_name, (int) cmd_in));
790 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
791
792 switch (cmd_in) {
793 case SG_IO:
794 {
795 int blocking = 1; /* ignore O_NONBLOCK flag */
796
797 if (sdp->detached)
798 return -ENODEV;
799 if (!scsi_block_when_processing_errors(sdp->device))
800 return -ENXIO;
801 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
802 return -EFAULT;
803 result =
0b07de85 804 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
a2dd3b4c 805 blocking, read_only, 1, &srp);
1da177e4
LT		 806 if (result < 0)
807 return result;
1da177e4
LT		 808 while (1) {
809 result = 0; /* following macro to beat race condition */
810 __wait_event_interruptible(sfp->read_wait,
a2dd3b4c
TB		 811 (srp->done || sdp->detached),
812 result);
1da177e4
LT		 813 if (sdp->detached)
814 return -ENODEV;
a2dd3b4c
TB		 815 write_lock_irq(&sfp->rq_list_lock);
816 if (srp->done) {
817 srp->done = 2;
818 write_unlock_irq(&sfp->rq_list_lock);
1da177e4 819 break;
a2dd3b4c 820 }
1da177e4 821 srp->orphan = 1;
a2dd3b4c 822 write_unlock_irq(&sfp->rq_list_lock);
1da177e4
LT		 823 return result; /* -ERESTARTSYS because signal hit process */
824 }
1da177e4
LT		 825 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
826 return (result < 0) ? result : 0;
827 }
828 case SG_SET_TIMEOUT:
829 result = get_user(val, ip);
830 if (result)
831 return result;
832 if (val < 0)
833 return -EIO;
834 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
835 val = MULDIV (INT_MAX, USER_HZ, HZ);
836 sfp->timeout_user = val;
837 sfp->timeout = MULDIV (val, HZ, USER_HZ);
838
839 return 0;
840 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
841 /* strange ..., for backward compatibility */
842 return sfp->timeout_user;
843 case SG_SET_FORCE_LOW_DMA:
844 result = get_user(val, ip);
845 if (result)
846 return result;
847 if (val) {
848 sfp->low_dma = 1;
849 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
850 val = (int) sfp->reserve.bufflen;
851 sg_remove_scat(&sfp->reserve);
852 sg_build_reserve(sfp, val);
853 }
854 } else {
855 if (sdp->detached)
856 return -ENODEV;
857 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
858 }
859 return 0;
860 case SG_GET_LOW_DMA:
861 return put_user((int) sfp->low_dma, ip);
862 case SG_GET_SCSI_ID:
863 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
864 return -EFAULT;
865 else {
866 sg_scsi_id_t __user *sg_idp = p;
867
868 if (sdp->detached)
869 return -ENODEV;
870 __put_user((int) sdp->device->host->host_no,
871 &sg_idp->host_no);
872 __put_user((int) sdp->device->channel,
873 &sg_idp->channel);
874 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
875 __put_user((int) sdp->device->lun, &sg_idp->lun);
876 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
877 __put_user((short) sdp->device->host->cmd_per_lun,
878 &sg_idp->h_cmd_per_lun);
879 __put_user((short) sdp->device->queue_depth,
880 &sg_idp->d_queue_depth);
881 __put_user(0, &sg_idp->unused[0]);
882 __put_user(0, &sg_idp->unused[1]);
883 return 0;
884 }
885 case SG_SET_FORCE_PACK_ID:
886 result = get_user(val, ip);
887 if (result)
888 return result;
889 sfp->force_packid = val ? 1 : 0;
890 return 0;
891 case SG_GET_PACK_ID:
892 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
893 return -EFAULT;
894 read_lock_irqsave(&sfp->rq_list_lock, iflags);
895 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
896 if ((1 == srp->done) && (!srp->sg_io_owned)) {
897 read_unlock_irqrestore(&sfp->rq_list_lock,
898 iflags);
899 __put_user(srp->header.pack_id, ip);
900 return 0;
901 }
902 }
903 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
904 __put_user(-1, ip);
905 return 0;
906 case SG_GET_NUM_WAITING:
907 read_lock_irqsave(&sfp->rq_list_lock, iflags);
908 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
909 if ((1 == srp->done) && (!srp->sg_io_owned))
910 ++val;
911 }
912 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
913 return put_user(val, ip);
914 case SG_GET_SG_TABLESIZE:
915 return put_user(sdp->sg_tablesize, ip);
916 case SG_SET_RESERVED_SIZE:
917 result = get_user(val, ip);
918 if (result)
919 return result;
920 if (val < 0)
921 return -EINVAL;
44ec9542 922 val = min_t(int, val,
ae03bf63 923 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 924 if (val != sfp->reserve.bufflen) {
925 if (sg_res_in_use(sfp) || sfp->mmap_called)
926 return -EBUSY;
927 sg_remove_scat(&sfp->reserve);
928 sg_build_reserve(sfp, val);
929 }
930 return 0;
931 case SG_GET_RESERVED_SIZE:
44ec9542 932 val = min_t(int, sfp->reserve.bufflen,
ae03bf63 933 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 934 return put_user(val, ip);
935 case SG_SET_COMMAND_Q:
936 result = get_user(val, ip);
937 if (result)
938 return result;
939 sfp->cmd_q = val ? 1 : 0;
940 return 0;
941 case SG_GET_COMMAND_Q:
942 return put_user((int) sfp->cmd_q, ip);
943 case SG_SET_KEEP_ORPHAN:
944 result = get_user(val, ip);
945 if (result)
946 return result;
947 sfp->keep_orphan = val;
948 return 0;
949 case SG_GET_KEEP_ORPHAN:
950 return put_user((int) sfp->keep_orphan, ip);
951 case SG_NEXT_CMD_LEN:
952 result = get_user(val, ip);
953 if (result)
954 return result;
955 sfp->next_cmd_len = (val > 0) ? val : 0;
956 return 0;
957 case SG_GET_VERSION_NUM:
958 return put_user(sg_version_num, ip);
959 case SG_GET_ACCESS_COUNT:
960 /* faked - we don't have a real access count anymore */
961 val = (sdp->device ? 1 : 0);
962 return put_user(val, ip);
963 case SG_GET_REQUEST_TABLE:
964 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
965 return -EFAULT;
966 else {
cb59e840
DG		 967 sg_req_info_t *rinfo;
968 unsigned int ms;
969
970 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
971 GFP_KERNEL);
972 if (!rinfo)
973 return -ENOMEM;
1da177e4
LT		 974 read_lock_irqsave(&sfp->rq_list_lock, iflags);
975 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
976 ++val, srp = srp ? srp->nextrp : srp) {
977 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
978 if (srp) {
979 rinfo[val].req_state = srp->done + 1;
980 rinfo[val].problem =
981 srp->header.masked_status &
982 srp->header.host_status &
983 srp->header.driver_status;
cb59e840
DG		 984 if (srp->done)
985 rinfo[val].duration =
986 srp->header.duration;
987 else {
988 ms = jiffies_to_msecs(jiffies);
989 rinfo[val].duration =
990 (ms > srp->header.duration) ?
991 (ms - srp->header.duration) : 0;
992 }
1da177e4 993 rinfo[val].orphan = srp->orphan;
cb59e840
DG		 994 rinfo[val].sg_io_owned =
995 srp->sg_io_owned;
996 rinfo[val].pack_id =
997 srp->header.pack_id;
998 rinfo[val].usr_ptr =
999 srp->header.usr_ptr;
1da177e4
LT		 1000 }
1001 }
1002 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840
DG		 1003 result = __copy_to_user(p, rinfo,
1004 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1005 result = result ? -EFAULT : 0;
1006 kfree(rinfo);
1007 return result;
1da177e4
LT		 1008 }
1009 case SG_EMULATED_HOST:
1010 if (sdp->detached)
1011 return -ENODEV;
1012 return put_user(sdp->device->host->hostt->emulated, ip);
1013 case SG_SCSI_RESET:
1014 if (sdp->detached)
1015 return -ENODEV;
1016 if (filp->f_flags & O_NONBLOCK) {
939647ee 1017 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1018 return -EBUSY;
1019 } else if (!scsi_block_when_processing_errors(sdp->device))
1020 return -EBUSY;
1021 result = get_user(val, ip);
1022 if (result)
1023 return result;
1024 if (SG_SCSI_RESET_NOTHING == val)
1025 return 0;
1026 switch (val) {
1027 case SG_SCSI_RESET_DEVICE:
1028 val = SCSI_TRY_RESET_DEVICE;
1029 break;
39120e11
BK		 1030 case SG_SCSI_RESET_TARGET:
1031 val = SCSI_TRY_RESET_TARGET;
1032 break;
1da177e4
LT		 1033 case SG_SCSI_RESET_BUS:
1034 val = SCSI_TRY_RESET_BUS;
1035 break;
1036 case SG_SCSI_RESET_HOST:
1037 val = SCSI_TRY_RESET_HOST;
1038 break;
1039 default:
1040 return -EINVAL;
1041 }
1042 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1043 return -EACCES;
1044 return (scsi_reset_provider(sdp->device, val) ==
1045 SUCCESS) ? 0 : -EIO;
1046 case SCSI_IOCTL_SEND_COMMAND:
1047 if (sdp->detached)
1048 return -ENODEV;
1049 if (read_only) {
1050 unsigned char opcode = WRITE_6;
1051 Scsi_Ioctl_Command __user *siocp = p;
1052
1053 if (copy_from_user(&opcode, siocp->data, 1))
1054 return -EFAULT;
14e507b8 1055 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1056 return -EPERM;
1057 }
e915e872 1058 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1da177e4
LT		 1059 case SG_SET_DEBUG:
1060 result = get_user(val, ip);
1061 if (result)
1062 return result;
1063 sdp->sgdebug = (char) val;
1064 return 0;
1065 case SCSI_IOCTL_GET_IDLUN:
1066 case SCSI_IOCTL_GET_BUS_NUMBER:
1067 case SCSI_IOCTL_PROBE_HOST:
1068 case SG_GET_TRANSFORM:
1069 if (sdp->detached)
1070 return -ENODEV;
1071 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542 1072 case BLKSECTGET:
ae03bf63 1073 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
44ec9542 1074 ip);
6da127ad
CS		 1075 case BLKTRACESETUP:
1076 return blk_trace_setup(sdp->device->request_queue,
1077 sdp->disk->disk_name,
76e3a19d 1078 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
d0deef5b 1079 NULL,
6da127ad
CS		 1080 (char *)arg);
1081 case BLKTRACESTART:
1082 return blk_trace_startstop(sdp->device->request_queue, 1);
1083 case BLKTRACESTOP:
1084 return blk_trace_startstop(sdp->device->request_queue, 0);
1085 case BLKTRACETEARDOWN:
1086 return blk_trace_remove(sdp->device->request_queue);
1da177e4
LT		 1087 default:
1088 if (read_only)
1089 return -EPERM; /* don't know so take safe approach */
1090 return scsi_ioctl(sdp->device, cmd_in, p);
1091 }
1092}
1093
f4927c45
AB		 1094static long
1095sg_unlocked_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1096{
1097 int ret;
1098
c45d15d2 1099 mutex_lock(&sg_mutex);
f4927c45 1100 ret = sg_ioctl(filp, cmd_in, arg);
c45d15d2 1101 mutex_unlock(&sg_mutex);
f4927c45
AB		 1102
1103 return ret;
1104}
1105
1da177e4
LT		 1106#ifdef CONFIG_COMPAT
1107static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1108{
1109 Sg_device *sdp;
1110 Sg_fd *sfp;
1111 struct scsi_device *sdev;
1112
1113 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1114 return -ENXIO;
1115
1116 sdev = sdp->device;
1117 if (sdev->host->hostt->compat_ioctl) {
1118 int ret;
1119
1120 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1121
1122 return ret;
1123 }
1124
1125 return -ENOIOCTLCMD;
1126}
1127#endif
1128
1129static unsigned int
1130sg_poll(struct file *filp, poll_table * wait)
1131{
1132 unsigned int res = 0;
1133 Sg_device *sdp;
1134 Sg_fd *sfp;
1135 Sg_request *srp;
1136 int count = 0;
1137 unsigned long iflags;
1138
1139 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1140 || sfp->closed)
1141 return POLLERR;
1142 poll_wait(filp, &sfp->read_wait, wait);
1143 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1144 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1145 /* if any read waiting, flag it */
1146 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1147 res = POLLIN | POLLRDNORM;
1148 ++count;
1149 }
1150 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1151
1152 if (sdp->detached)
1153 res |= POLLHUP;
1154 else if (!sfp->cmd_q) {
1155 if (0 == count)
1156 res |= POLLOUT | POLLWRNORM;
1157 } else if (count < SG_MAX_QUEUE)
1158 res |= POLLOUT | POLLWRNORM;
1159 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1160 sdp->disk->disk_name, (int) res));
1161 return res;
1162}
1163
1164static int
1165sg_fasync(int fd, struct file *filp, int mode)
1166{
1da177e4
LT		 1167 Sg_device *sdp;
1168 Sg_fd *sfp;
1169
1170 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1171 return -ENXIO;
1172 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1173 sdp->disk->disk_name, mode));
1174
60aa4924 1175 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1da177e4
LT		 1176}
1177
a13ff0bb
NP		 1178static int
1179sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1180{
1181 Sg_fd *sfp;
d6b10348 1182 unsigned long offset, len, sa;
1da177e4 1183 Sg_scatter_hold *rsv_schp;
10db10d1 1184 int k, length;
1da177e4
LT		 1185
1186 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1187 return VM_FAULT_SIGBUS;
1da177e4 1188 rsv_schp = &sfp->reserve;
a13ff0bb 1189 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1190 if (offset >= rsv_schp->bufflen)
a13ff0bb
NP		 1191 return VM_FAULT_SIGBUS;
1192 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1da177e4 1193 offset, rsv_schp->k_use_sg));
d6b10348 1194 sa = vma->vm_start;
10db10d1
FT		 1195 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1196 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1197 len = vma->vm_end - sa;
10db10d1 1198 len = (len < length) ? len : length;
d6b10348 1199 if (offset < len) {
10db10d1
FT		 1200 struct page *page = nth_page(rsv_schp->pages[k],
1201 offset >> PAGE_SHIFT);
d6b10348 1202 get_page(page); /* increment page count */
a13ff0bb
NP		 1203 vmf->page = page;
1204 return 0; /* success */
1da177e4 1205 }
d6b10348
MC		 1206 sa += len;
1207 offset -= len;
1da177e4 1208 }
d6b10348 1209
a13ff0bb 1210 return VM_FAULT_SIGBUS;
1da177e4
LT		 1211}
1212
f0f37e2f 1213static const struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1214 .fault = sg_vma_fault,
1da177e4
LT		 1215};
1216
1217static int
1218sg_mmap(struct file *filp, struct vm_area_struct *vma)
1219{
1220 Sg_fd *sfp;
d6b10348 1221 unsigned long req_sz, len, sa;
1da177e4 1222 Sg_scatter_hold *rsv_schp;
10db10d1 1223 int k, length;
1da177e4
LT		 1224
1225 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1226 return -ENXIO;
cb59e840 1227 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1228 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1229 (void *) vma->vm_start, (int) req_sz));
1230 if (vma->vm_pgoff)
1231 return -EINVAL; /* want no offset */
1232 rsv_schp = &sfp->reserve;
1233 if (req_sz > rsv_schp->bufflen)
1234 return -ENOMEM; /* cannot map more than reserved buffer */
1235
d6b10348 1236 sa = vma->vm_start;
10db10d1
FT		 1237 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1238 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1239 len = vma->vm_end - sa;
10db10d1 1240 len = (len < length) ? len : length;
d6b10348 1241 sa += len;
1da177e4 1242 }
d6b10348 1243
f9aed0e2 1244 sfp->mmap_called = 1;
1c8e71d7 1245 vma->vm_flags |= VM_RESERVED;
1da177e4
LT		 1246 vma->vm_private_data = sfp;
1247 vma->vm_ops = &sg_mmap_vm_ops;
1248 return 0;
1249}
1250
c96952ed
FT		 1251static void sg_rq_end_io_usercontext(struct work_struct *work)
1252{
1253 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1254 struct sg_fd *sfp = srp->parentfp;
1255
1256 sg_finish_rem_req(srp);
1257 kref_put(&sfp->f_ref, sg_remove_sfp);
1258}
1259
a91a3a20
FT		 1260/*
1261 * This function is a "bottom half" handler that is called by the mid
1262 * level when a command is completed (or has failed).
1263 */
1264static void sg_rq_end_io(struct request *rq, int uptodate)
1da177e4 1265{
a91a3a20 1266 struct sg_request *srp = rq->end_io_data;
c6517b79 1267 Sg_device *sdp;
1da177e4 1268 Sg_fd *sfp;
1da177e4 1269 unsigned long iflags;
cb59e840 1270 unsigned int ms;
a91a3a20 1271 char *sense;
c6517b79 1272 int result, resid, done = 1;
1da177e4 1273
c6517b79 1274 if (WARN_ON(srp->done != 0))
1da177e4 1275 return;
c6517b79 1276
1da177e4 1277 sfp = srp->parentfp;
c6517b79 1278 if (WARN_ON(sfp == NULL))
1da177e4 1279 return;
c6517b79
TB		 1280
1281 sdp = sfp->parentdp;
1282 if (unlikely(sdp->detached))
1283 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1da177e4 1284
a91a3a20
FT		 1285 sense = rq->sense;
1286 result = rq->errors;
c3a4d78c 1287 resid = rq->resid_len;
1da177e4
LT		 1288
1289 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1290 sdp->disk->disk_name, srp->header.pack_id, result));
1291 srp->header.resid = resid;
cb59e840
DG		 1292 ms = jiffies_to_msecs(jiffies);
1293 srp->header.duration = (ms > srp->header.duration) ?
1294 (ms - srp->header.duration) : 0;
d6b10348 1295 if (0 != result) {
1da177e4
LT		 1296 struct scsi_sense_hdr sshdr;
1297
d6b10348
MC		 1298 srp->header.status = 0xff & result;
1299 srp->header.masked_status = status_byte(result);
1300 srp->header.msg_status = msg_byte(result);
1301 srp->header.host_status = host_byte(result);
1302 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1303 if ((sdp->sgdebug > 0) &&
1304 ((CHECK_CONDITION == srp->header.masked_status) ||
1305 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1306 __scsi_print_sense("sg_cmd_done", sense,
1307 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1308
1309 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1310 if (driver_byte(result) != 0
1311 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1312 && !scsi_sense_is_deferred(&sshdr)
1313 && sshdr.sense_key == UNIT_ATTENTION
1314 && sdp->device->removable) {
1315 /* Detected possible disc change. Set the bit - this */
1316 /* may be used if there are filesystems using this device */
1317 sdp->device->changed = 1;
1318 }
1319 }
1320 /* Rely on write phase to clean out srp status values, so no "else" */
1321
c6517b79
TB		 1322 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1323 if (unlikely(srp->orphan)) {
1da177e4
LT		 1324 if (sfp->keep_orphan)
1325 srp->sg_io_owned = 0;
c6517b79
TB		 1326 else
1327 done = 0;
1da177e4 1328 }
c6517b79
TB		 1329 srp->done = done;
1330 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1331
1332 if (likely(done)) {
1333 /* Now wake up any sg_read() that is waiting for this
1334 * packet.
1335 */
1da177e4 1336 wake_up_interruptible(&sfp->read_wait);
c6517b79 1337 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
c96952ed 1338 kref_put(&sfp->f_ref, sg_remove_sfp);
015640ed
FT		 1339 } else {
1340 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1341 schedule_work(&srp->ew.work);
1342 }
1da177e4
LT		 1343}
1344
828c0950 1345static const struct file_operations sg_fops = {
1da177e4
LT		 1346 .owner = THIS_MODULE,
1347 .read = sg_read,
1348 .write = sg_write,
1349 .poll = sg_poll,
f4927c45 1350 .unlocked_ioctl = sg_unlocked_ioctl,
1da177e4
LT		 1351#ifdef CONFIG_COMPAT
1352 .compat_ioctl = sg_compat_ioctl,
1353#endif
1354 .open = sg_open,
1355 .mmap = sg_mmap,
1356 .release = sg_release,
1357 .fasync = sg_fasync,
6038f373 1358 .llseek = no_llseek,
1da177e4
LT		 1359};
1360
d253878b 1361static struct class *sg_sysfs_class;
1da177e4
LT		 1362
1363static int sg_sysfs_valid = 0;
1364
7c07d613 1365static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1366{
d6b10348 1367 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1368 Sg_device *sdp;
1369 unsigned long iflags;
7c07d613
JB		 1370 int error;
1371 u32 k;
1da177e4 1372
24669f75 1373 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1374 if (!sdp) {
1375 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1376 return ERR_PTR(-ENOMEM);
1377 }
c6517b79 1378
7c07d613
JB		 1379 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1380 printk(KERN_WARNING "idr expansion Sg_device failure\n");
c6517b79 1381 error = -ENOMEM;
7c07d613 1382 goto out;
1da177e4
LT		 1383 }
1384
7c07d613 1385 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4 1386
c6517b79 1387 error = idr_get_new(&sg_index_idr, sdp, &k);
7c07d613 1388 if (error) {
c6517b79 1389 write_unlock_irqrestore(&sg_index_lock, iflags);
7c07d613
JB		 1390 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1391 error);
1392 goto out;
1da177e4
LT		 1393 }
1394
1da177e4
LT		 1395 if (unlikely(k >= SG_MAX_DEVS))
1396 goto overflow;
1397
1da177e4
LT		 1398 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1399 sprintf(disk->disk_name, "sg%d", k);
1400 disk->first_minor = k;
1401 sdp->disk = disk;
1402 sdp->device = scsidp;
3442f802 1403 INIT_LIST_HEAD(&sdp->sfds);
1da177e4 1404 init_waitqueue_head(&sdp->o_excl_wait);
8a78362c 1405 sdp->sg_tablesize = queue_max_segments(q);
7c07d613 1406 sdp->index = k;
c6517b79
TB		 1407 kref_init(&sdp->d_ref);
1408
1409 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 1410
7c07d613 1411 error = 0;
1da177e4 1412 out:
7c07d613 1413 if (error) {
1da177e4 1414 kfree(sdp);
7c07d613
JB		 1415 return ERR_PTR(error);
1416 }
1417 return sdp;
1da177e4
LT		 1418
1419 overflow:
c6517b79
TB		 1420 idr_remove(&sg_index_idr, k);
1421 write_unlock_irqrestore(&sg_index_lock, iflags);
9ccfc756
JB		 1422 sdev_printk(KERN_WARNING, scsidp,
1423 "Unable to attach sg device type=%d, minor "
1424 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1da177e4
LT		 1425 error = -ENODEV;
1426 goto out;
1427}
1428
1429static int
ee959b00 1430sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1431{
ee959b00 1432 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1433 struct gendisk *disk;
1434 Sg_device *sdp = NULL;
1435 struct cdev * cdev = NULL;
7c07d613 1436 int error;
454e8957 1437 unsigned long iflags;
1da177e4
LT		 1438
1439 disk = alloc_disk(1);
1440 if (!disk) {
1441 printk(KERN_WARNING "alloc_disk failed\n");
1442 return -ENOMEM;
1443 }
1444 disk->major = SCSI_GENERIC_MAJOR;
1445
1446 error = -ENOMEM;
1447 cdev = cdev_alloc();
1448 if (!cdev) {
1449 printk(KERN_WARNING "cdev_alloc failed\n");
1450 goto out;
1451 }
1452 cdev->owner = THIS_MODULE;
1453 cdev->ops = &sg_fops;
1454
7c07d613
JB		 1455 sdp = sg_alloc(disk, scsidp);
1456 if (IS_ERR(sdp)) {
1da177e4 1457 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1458 error = PTR_ERR(sdp);
1da177e4
LT		 1459 goto out;
1460 }
1da177e4 1461
7c07d613 1462 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1463 if (error)
454e8957 1464 goto cdev_add_err;
5e3c34c1 1465
1da177e4
LT		 1466 sdp->cdev = cdev;
1467 if (sg_sysfs_valid) {
ee959b00 1468 struct device *sg_class_member;
1da177e4 1469
d73a1a67
GKH		 1470 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1471 MKDEV(SCSI_GENERIC_MAJOR,
1472 sdp->index),
1473 sdp, "%s", disk->disk_name);
d07e0361
FT		 1474 if (IS_ERR(sg_class_member)) {
1475 printk(KERN_ERR "sg_add: "
ee959b00 1476 "device_create failed\n");
d07e0361
FT		 1477 error = PTR_ERR(sg_class_member);
1478 goto cdev_add_err;
1479 }
d07e0361 1480 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1481 &sg_class_member->kobj, "generic");
1482 if (error)
1483 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1484 "'generic' back to sg%d\n", sdp->index);
1da177e4 1485 } else
7c07d613 1486 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1487
9ccfc756 1488 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1489 "Attached scsi generic sg%d type %d\n", sdp->index,
1490 scsidp->type);
1da177e4 1491
ee959b00 1492 dev_set_drvdata(cl_dev, sdp);
a24484f2 1493
1da177e4
LT		 1494 return 0;
1495
454e8957 1496cdev_add_err:
7c07d613
JB		 1497 write_lock_irqsave(&sg_index_lock, iflags);
1498 idr_remove(&sg_index_idr, sdp->index);
1499 write_unlock_irqrestore(&sg_index_lock, iflags);
1500 kfree(sdp);
454e8957 1501
1da177e4
LT		 1502out:
1503 put_disk(disk);
1504 if (cdev)
1505 cdev_del(cdev);
1506 return error;
1507}
1508
c6517b79
TB		 1509static void sg_device_destroy(struct kref *kref)
1510{
1511 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1512 unsigned long flags;
1513
1514 /* CAUTION! Note that the device can still be found via idr_find()
1515 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1516 * any other cleanup.
1517 */
1518
1519 write_lock_irqsave(&sg_index_lock, flags);
1520 idr_remove(&sg_index_idr, sdp->index);
1521 write_unlock_irqrestore(&sg_index_lock, flags);
1522
1523 SCSI_LOG_TIMEOUT(3,
1524 printk("sg_device_destroy: %s\n",
1525 sdp->disk->disk_name));
1526
1527 put_disk(sdp->disk);
1528 kfree(sdp);
1529}
1530
1531static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1532{
ee959b00
TJ		 1533 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1534 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1535 unsigned long iflags;
1536 Sg_fd *sfp;
1da177e4 1537
c6517b79 1538 if (!sdp || sdp->detached)
1da177e4 1539 return;
7c07d613 1540
c6517b79
TB		 1541 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1542
1543 /* Need a write lock to set sdp->detached. */
7c07d613 1544 write_lock_irqsave(&sg_index_lock, iflags);
c6517b79 1545 sdp->detached = 1;
3442f802 1546 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
c6517b79
TB		 1547 wake_up_interruptible(&sfp->read_wait);
1548 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
7c07d613
JB		 1549 }
1550 write_unlock_irqrestore(&sg_index_lock, iflags);
1551
1552 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1553 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1554 cdev_del(sdp->cdev);
1555 sdp->cdev = NULL;
1da177e4 1556
c6517b79 1557 sg_put_dev(sdp);
1da177e4
LT		 1558}
1559
6460e75a
DG		 1560module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1561module_param_named(def_reserved_size, def_reserved_size, int,
1562 S_IRUGO | S_IWUSR);
1da177e4
LT		 1563module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1564
1565MODULE_AUTHOR("Douglas Gilbert");
1566MODULE_DESCRIPTION("SCSI generic (sg) driver");
1567MODULE_LICENSE("GPL");
1568MODULE_VERSION(SG_VERSION_STR);
f018fa55 1569MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1570
6460e75a
DG		 1571MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1572 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1573MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1574MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1575
1576static int __init
1577init_sg(void)
1578{
1579 int rc;
1580
6460e75a
DG		 1581 if (scatter_elem_sz < PAGE_SIZE) {
1582 scatter_elem_sz = PAGE_SIZE;
1583 scatter_elem_sz_prev = scatter_elem_sz;
1584 }
1da177e4
LT		 1585 if (def_reserved_size >= 0)
1586 sg_big_buff = def_reserved_size;
6460e75a
DG		 1587 else
1588 def_reserved_size = sg_big_buff;
1da177e4
LT		 1589
1590 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1591 SG_MAX_DEVS, "sg");
1592 if (rc)
1593 return rc;
d253878b 1594 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1595 if ( IS_ERR(sg_sysfs_class) ) {
1596 rc = PTR_ERR(sg_sysfs_class);
1597 goto err_out;
1598 }
1599 sg_sysfs_valid = 1;
1600 rc = scsi_register_interface(&sg_interface);
1601 if (0 == rc) {
1602#ifdef CONFIG_SCSI_PROC_FS
1603 sg_proc_init();
1604#endif /* CONFIG_SCSI_PROC_FS */
1605 return 0;
1606 }
d253878b 1607 class_destroy(sg_sysfs_class);
1da177e4
LT		 1608err_out:
1609 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1610 return rc;
1611}
1612
1613static void __exit
1614exit_sg(void)
1615{
1616#ifdef CONFIG_SCSI_PROC_FS
1617 sg_proc_cleanup();
1618#endif /* CONFIG_SCSI_PROC_FS */
1619 scsi_unregister_interface(&sg_interface);
d253878b 1620 class_destroy(sg_sysfs_class);
1da177e4
LT		 1621 sg_sysfs_valid = 0;
1622 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1623 SG_MAX_DEVS);
7c07d613 1624 idr_destroy(&sg_index_idr);
1da177e4
LT		 1625}
1626
44c7b0ea 1627static int sg_start_req(Sg_request *srp, unsigned char *cmd)
10865dfa 1628{
626710c9 1629 int res;
10865dfa 1630 struct request *rq;
44c7b0ea
FT		 1631 Sg_fd *sfp = srp->parentfp;
1632 sg_io_hdr_t *hp = &srp->header;
1633 int dxfer_len = (int) hp->dxfer_len;
1634 int dxfer_dir = hp->dxfer_direction;
626710c9 1635 unsigned int iov_count = hp->iovec_count;
44c7b0ea
FT		 1636 Sg_scatter_hold *req_schp = &srp->data;
1637 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1638 struct request_queue *q = sfp->parentdp->device->request_queue;
626710c9 1639 struct rq_map_data *md, map_data;
10865dfa
FT		 1640 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1641
44c7b0ea
FT		 1642 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1643 dxfer_len));
1644
10865dfa
FT		 1645 rq = blk_get_request(q, rw, GFP_ATOMIC);
1646 if (!rq)
1647 return -ENOMEM;
1648
1649 memcpy(rq->cmd, cmd, hp->cmd_len);
1650
1651 rq->cmd_len = hp->cmd_len;
1652 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1653
1654 srp->rq = rq;
1655 rq->end_io_data = srp;
1656 rq->sense = srp->sense_b;
1657 rq->retries = SG_DEFAULT_RETRIES;
1658
1da177e4 1659 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1660 return 0;
10865dfa 1661
626710c9
FT		 1662 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1663 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1664 !sfp->parentdp->device->host->unchecked_isa_dma &&
2610a254 1665 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
626710c9
FT		 1666 md = NULL;
1667 else
1668 md = &map_data;
1669
1670 if (md) {
1671 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1672 sg_link_reserve(sfp, srp, dxfer_len);
1673 else {
1674 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1675 if (res)
1676 return res;
1677 }
7e56cb0f 1678
626710c9
FT		 1679 md->pages = req_schp->pages;
1680 md->page_order = req_schp->page_order;
1681 md->nr_entries = req_schp->k_use_sg;
56c451f4 1682 md->offset = 0;
97ae77a1 1683 md->null_mapped = hp->dxferp ? 0 : 1;
ecb554a8
FT		 1684 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1685 md->from_user = 1;
1686 else
1687 md->from_user = 0;
626710c9
FT		 1688 }
1689
0fdf96b6
FT		 1690 if (iov_count) {
1691 int len, size = sizeof(struct sg_iovec) * iov_count;
1692 struct iovec *iov;
1693
3094141c
JL		 1694 iov = memdup_user(hp->dxferp, size);
1695 if (IS_ERR(iov))
1696 return PTR_ERR(iov);
0fdf96b6
FT		 1697
1698 len = iov_length(iov, iov_count);
1699 if (hp->dxfer_len < len) {
1700 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1701 len = hp->dxfer_len;
1702 }
1703
1704 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1705 iov_count,
1706 len, GFP_ATOMIC);
1707 kfree(iov);
1708 } else
626710c9
FT		 1709 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1710 hp->dxfer_len, GFP_ATOMIC);
10db10d1
FT		 1711
1712 if (!res) {
626710c9 1713 srp->bio = rq->bio;
10db10d1 1714
626710c9
FT		 1715 if (!md) {
1716 req_schp->dio_in_use = 1;
1717 hp->info |= SG_INFO_DIRECT_IO;
1718 }
1719 }
10db10d1 1720 return res;
1da177e4
LT		 1721}
1722
e7ee4cc0 1723static int sg_finish_rem_req(Sg_request * srp)
1da177e4 1724{
e7ee4cc0
FT		 1725 int ret = 0;
1726
1da177e4
LT		 1727 Sg_fd *sfp = srp->parentfp;
1728 Sg_scatter_hold *req_schp = &srp->data;
1729
1730 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
6e5a30cb
FT		 1731 if (srp->rq) {
1732 if (srp->bio)
e7ee4cc0 1733 ret = blk_rq_unmap_user(srp->bio);
10db10d1 1734
10865dfa 1735 blk_put_request(srp->rq);
6e5a30cb 1736 }
10865dfa 1737
e27168f8
CS		 1738 if (srp->res_used)
1739 sg_unlink_reserve(sfp, srp);
1740 else
1741 sg_remove_scat(req_schp);
1742
1da177e4 1743 sg_remove_request(sfp, srp);
e7ee4cc0
FT		 1744
1745 return ret;
1da177e4
LT		 1746}
1747
1748static int
1749sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1750{
10db10d1 1751 int sg_bufflen = tablesize * sizeof(struct page *);
2d20eaf9 1752 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1753
10db10d1
FT		 1754 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1755 if (!schp->pages)
1da177e4 1756 return -ENOMEM;
1da177e4 1757 schp->sglist_len = sg_bufflen;
d6b10348 1758 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1759}
1760
1da177e4
LT		 1761static int
1762sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1763{
10db10d1 1764 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1765 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1766 int blk_size = buff_size, order;
1767 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4 1768
fb119935 1769 if (blk_size < 0)
1da177e4
LT		 1770 return -EFAULT;
1771 if (0 == blk_size)
1772 ++blk_size; /* don't know why */
b2ed6c69
FT		 1773 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1774 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1da177e4
LT		 1775 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1776 buff_size, blk_size));
d6b10348
MC		 1777
1778 /* N.B. ret_sz carried into this block ... */
1779 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1780 if (mx_sc_elems < 0)
1781 return mx_sc_elems; /* most likely -ENOMEM */
1782
6460e75a
DG		 1783 num = scatter_elem_sz;
1784 if (unlikely(num != scatter_elem_sz_prev)) {
1785 if (num < PAGE_SIZE) {
1786 scatter_elem_sz = PAGE_SIZE;
1787 scatter_elem_sz_prev = PAGE_SIZE;
1788 } else
1789 scatter_elem_sz_prev = num;
1790 }
10db10d1
FT		 1791
1792 if (sfp->low_dma)
1793 gfp_mask |= GFP_DMA;
1794
1795 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1796 gfp_mask |= __GFP_ZERO;
1797
1798 order = get_order(num);
1799retry:
1800 ret_sz = 1 << (PAGE_SHIFT + order);
1801
1802 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1803 k++, rem_sz -= ret_sz) {
1804
6460e75a 1805 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1806 scatter_elem_sz_prev : rem_sz;
1807
1808 schp->pages[k] = alloc_pages(gfp_mask, order);
1809 if (!schp->pages[k])
1810 goto out;
d6b10348 1811
6460e75a
DG		 1812 if (num == scatter_elem_sz_prev) {
1813 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1814 scatter_elem_sz = ret_sz;
1815 scatter_elem_sz_prev = ret_sz;
1816 }
1817 }
d6b10348 1818
7ca63cb4
DG		 1819 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1820 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1821 } /* end of for loop */
1822
10db10d1 1823 schp->page_order = order;
d6b10348 1824 schp->k_use_sg = k;
7ca63cb4
DG		 1825 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1826 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1827
1828 schp->bufflen = blk_size;
1829 if (rem_sz > 0) /* must have failed */
1830 return -ENOMEM;
1da177e4 1831 return 0;
10db10d1
FT		 1832out:
1833 for (i = 0; i < k; i++)
e71044ee 1834 __free_pages(schp->pages[i], order);
10db10d1
FT		 1835
1836 if (--order >= 0)
1837 goto retry;
1838
1839 return -ENOMEM;
1da177e4
LT		 1840}
1841
1da177e4
LT		 1842static void
1843sg_remove_scat(Sg_scatter_hold * schp)
1844{
1845 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1846 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1847 if (!schp->dio_in_use) {
1da177e4
LT		 1848 int k;
1849
10db10d1 1850 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1da177e4 1851 SCSI_LOG_TIMEOUT(5, printk(
10db10d1
FT		 1852 "sg_remove_scat: k=%d, pg=0x%p\n",
1853 k, schp->pages[k]));
1854 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1855 }
6e5a30cb 1856
10db10d1 1857 kfree(schp->pages);
1da177e4 1858 }
d6b10348 1859 }
1da177e4
LT		 1860 memset(schp, 0, sizeof (*schp));
1861}
1862
1da177e4
LT		 1863static int
1864sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1865{
1866 Sg_scatter_hold *schp = &srp->data;
d6b10348 1867 int k, num;
1da177e4
LT		 1868
1869 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1870 num_read_xfer));
1871 if ((!outp) || (num_read_xfer <= 0))
1872 return 0;
d6b10348 1873
10db10d1
FT		 1874 num = 1 << (PAGE_SHIFT + schp->page_order);
1875 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1876 if (num > num_read_xfer) {
10db10d1 1877 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1878 num_read_xfer))
1879 return -EFAULT;
1880 break;
1881 } else {
10db10d1 1882 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1883 num))
1884 return -EFAULT;
1885 num_read_xfer -= num;
1886 if (num_read_xfer <= 0)
1da177e4 1887 break;
d6b10348 1888 outp += num;
1da177e4 1889 }
1da177e4 1890 }
d6b10348 1891
1da177e4
LT		 1892 return 0;
1893}
1894
1895static void
1896sg_build_reserve(Sg_fd * sfp, int req_size)
1897{
1898 Sg_scatter_hold *schp = &sfp->reserve;
1899
1900 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1901 do {
1902 if (req_size < PAGE_SIZE)
1903 req_size = PAGE_SIZE;
1904 if (0 == sg_build_indirect(schp, sfp, req_size))
1905 return;
1906 else
1907 sg_remove_scat(schp);
1908 req_size >>= 1; /* divide by 2 */
1909 } while (req_size > (PAGE_SIZE / 2));
1910}
1911
1912static void
1913sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1914{
1915 Sg_scatter_hold *req_schp = &srp->data;
1916 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 1917 int k, num, rem;
1da177e4
LT		 1918
1919 srp->res_used = 1;
1920 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 1921 rem = size;
d6b10348 1922
10db10d1
FT		 1923 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1924 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 1925 if (rem <= num) {
d6b10348
MC		 1926 req_schp->k_use_sg = k + 1;
1927 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 1928 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 1929
1930 req_schp->bufflen = size;
10db10d1 1931 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 1932 break;
1933 } else
1934 rem -= num;
1da177e4 1935 }
d6b10348
MC		 1936
1937 if (k >= rsv_schp->k_use_sg)
1938 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 1939}
1940
1941static void
1942sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1943{
1944 Sg_scatter_hold *req_schp = &srp->data;
1da177e4
LT		 1945
1946 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1947 (int) req_schp->k_use_sg));
1da177e4
LT		 1948 req_schp->k_use_sg = 0;
1949 req_schp->bufflen = 0;
10db10d1
FT		 1950 req_schp->pages = NULL;
1951 req_schp->page_order = 0;
1da177e4
LT		 1952 req_schp->sglist_len = 0;
1953 sfp->save_scat_len = 0;
1954 srp->res_used = 0;
1955}
1956
1957static Sg_request *
1958sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1959{
1960 Sg_request *resp;
1961 unsigned long iflags;
1962
1963 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1964 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1965 /* look for requests that are ready + not SG_IO owned */
1966 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1967 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1968 resp->done = 2; /* guard against other readers */
1969 break;
1970 }
1971 }
1972 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1973 return resp;
1974}
1975
1da177e4
LT		 1976/* always adds to end of list */
1977static Sg_request *
1978sg_add_request(Sg_fd * sfp)
1979{
1980 int k;
1981 unsigned long iflags;
1982 Sg_request *resp;
1983 Sg_request *rp = sfp->req_arr;
1984
1985 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1986 resp = sfp->headrp;
1987 if (!resp) {
1988 memset(rp, 0, sizeof (Sg_request));
1989 rp->parentfp = sfp;
1990 resp = rp;
1991 sfp->headrp = resp;
1992 } else {
1993 if (0 == sfp->cmd_q)
1994 resp = NULL; /* command queuing disallowed */
1995 else {
1996 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
1997 if (!rp->parentfp)
1998 break;
1999 }
2000 if (k < SG_MAX_QUEUE) {
2001 memset(rp, 0, sizeof (Sg_request));
2002 rp->parentfp = sfp;
2003 while (resp->nextrp)
2004 resp = resp->nextrp;
2005 resp->nextrp = rp;
2006 resp = rp;
2007 } else
2008 resp = NULL;
2009 }
2010 }
2011 if (resp) {
2012 resp->nextrp = NULL;
cb59e840 2013 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2014 }
2015 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2016 return resp;
2017}
2018
2019/* Return of 1 for found; 0 for not found */
2020static int
2021sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2022{
2023 Sg_request *prev_rp;
2024 Sg_request *rp;
2025 unsigned long iflags;
2026 int res = 0;
2027
2028 if ((!sfp) || (!srp) || (!sfp->headrp))
2029 return res;
2030 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2031 prev_rp = sfp->headrp;
2032 if (srp == prev_rp) {
2033 sfp->headrp = prev_rp->nextrp;
2034 prev_rp->parentfp = NULL;
2035 res = 1;
2036 } else {
2037 while ((rp = prev_rp->nextrp)) {
2038 if (srp == rp) {
2039 prev_rp->nextrp = rp->nextrp;
2040 rp->parentfp = NULL;
2041 res = 1;
2042 break;
2043 }
2044 prev_rp = rp;
2045 }
2046 }
2047 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2048 return res;
2049}
2050
1da177e4
LT		 2051static Sg_fd *
2052sg_add_sfp(Sg_device * sdp, int dev)
2053{
2054 Sg_fd *sfp;
2055 unsigned long iflags;
44ec9542 2056 int bufflen;
1da177e4 2057
d6b10348 2058 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4
LT		 2059 if (!sfp)
2060 return NULL;
d6b10348 2061
1da177e4
LT		 2062 init_waitqueue_head(&sfp->read_wait);
2063 rwlock_init(&sfp->rq_list_lock);
2064
c6517b79 2065 kref_init(&sfp->f_ref);
1da177e4
LT		 2066 sfp->timeout = SG_DEFAULT_TIMEOUT;
2067 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2068 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2069 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2070 sdp->device->host->unchecked_isa_dma : 1;
2071 sfp->cmd_q = SG_DEF_COMMAND_Q;
2072 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2073 sfp->parentdp = sdp;
7c07d613 2074 write_lock_irqsave(&sg_index_lock, iflags);
3442f802 2075 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
7c07d613 2076 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2077 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2078 if (unlikely(sg_big_buff != def_reserved_size))
2079 sg_big_buff = def_reserved_size;
2080
44ec9542 2081 bufflen = min_t(int, sg_big_buff,
ae03bf63 2082 queue_max_sectors(sdp->device->request_queue) * 512);
44ec9542 2083 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2084 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2085 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
c6517b79
TB		 2086
2087 kref_get(&sdp->d_ref);
2088 __module_get(THIS_MODULE);
1da177e4
LT		 2089 return sfp;
2090}
2091
c6517b79 2092static void sg_remove_sfp_usercontext(struct work_struct *work)
1da177e4 2093{
c6517b79
TB		 2094 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2095 struct sg_device *sdp = sfp->parentdp;
2096
2097 /* Cleanup any responses which were never read(). */
2098 while (sfp->headrp)
2099 sg_finish_rem_req(sfp->headrp);
1da177e4 2100
1da177e4 2101 if (sfp->reserve.bufflen > 0) {
c6517b79
TB		 2102 SCSI_LOG_TIMEOUT(6,
2103 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2104 (int) sfp->reserve.bufflen,
2105 (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2106 sg_remove_scat(&sfp->reserve);
2107 }
c6517b79
TB		 2108
2109 SCSI_LOG_TIMEOUT(6,
2110 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2111 sdp->disk->disk_name,
2112 sfp));
d6b10348 2113 kfree(sfp);
c6517b79
TB		 2114
2115 scsi_device_put(sdp->device);
2116 sg_put_dev(sdp);
2117 module_put(THIS_MODULE);
1da177e4
LT		 2118}
2119
c6517b79 2120static void sg_remove_sfp(struct kref *kref)
1da177e4 2121{
c6517b79
TB		 2122 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2123 struct sg_device *sdp = sfp->parentdp;
c6517b79 2124 unsigned long iflags;
1da177e4 2125
c6517b79 2126 write_lock_irqsave(&sg_index_lock, iflags);
3442f802 2127 list_del(&sfp->sfd_siblings);
c6517b79
TB		 2128 write_unlock_irqrestore(&sg_index_lock, iflags);
2129 wake_up_interruptible(&sdp->o_excl_wait);
1da177e4 2130
015640ed
FT		 2131 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2132 schedule_work(&sfp->ew.work);
1da177e4
LT		 2133}
2134
2135static int
2136sg_res_in_use(Sg_fd * sfp)
2137{
2138 const Sg_request *srp;
2139 unsigned long iflags;
2140
2141 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2142 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2143 if (srp->res_used)
2144 break;
2145 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2146 return srp ? 1 : 0;
2147}
2148
1da177e4 2149#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2150static int
2151sg_idr_max_id(int id, void *p, void *data)
2152{
2153 int *k = data;
2154
2155 if (*k < id)
2156 *k = id;
2157
2158 return 0;
2159}
2160
1da177e4
LT		 2161static int
2162sg_last_dev(void)
2163{
53474c04 2164 int k = -1;
1da177e4
LT		 2165 unsigned long iflags;
2166
7c07d613
JB		 2167 read_lock_irqsave(&sg_index_lock, iflags);
2168 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2169 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2170 return k + 1; /* origin 1 */
2171}
2172#endif
2173
c6517b79
TB		 2174/* must be called with sg_index_lock held */
2175static Sg_device *sg_lookup_dev(int dev)
1da177e4 2176{
c6517b79
TB		 2177 return idr_find(&sg_index_idr, dev);
2178}
1da177e4 2179
c6517b79
TB		 2180static Sg_device *sg_get_dev(int dev)
2181{
2182 struct sg_device *sdp;
2183 unsigned long flags;
2184
2185 read_lock_irqsave(&sg_index_lock, flags);
2186 sdp = sg_lookup_dev(dev);
2187 if (!sdp)
2188 sdp = ERR_PTR(-ENXIO);
2189 else if (sdp->detached) {
2190 /* If sdp->detached, then the refcount may already be 0, in
2191 * which case it would be a bug to do kref_get().
2192 */
2193 sdp = ERR_PTR(-ENODEV);
2194 } else
2195 kref_get(&sdp->d_ref);
2196 read_unlock_irqrestore(&sg_index_lock, flags);
7c07d613 2197
1da177e4
LT		 2198 return sdp;
2199}
2200
c6517b79
TB		 2201static void sg_put_dev(struct sg_device *sdp)
2202{
2203 kref_put(&sdp->d_ref, sg_device_destroy);
2204}
2205
1da177e4
LT		 2206#ifdef CONFIG_SCSI_PROC_FS
2207
2208static struct proc_dir_entry *sg_proc_sgp = NULL;
2209
2210static char sg_proc_sg_dirname[] = "scsi/sg";
2211
2212static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2213
2214static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2215static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2216 size_t count, loff_t *off);
828c0950
AD		 2217static const struct file_operations adio_fops = {
2218 .owner = THIS_MODULE,
1da177e4 2219 .open = sg_proc_single_open_adio,
828c0950
AD		 2220 .read = seq_read,
2221 .llseek = seq_lseek,
1da177e4
LT		 2222 .write = sg_proc_write_adio,
2223 .release = single_release,
2224};
2225
2226static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2227static ssize_t sg_proc_write_dressz(struct file *filp,
2228 const char __user *buffer, size_t count, loff_t *off);
828c0950
AD		 2229static const struct file_operations dressz_fops = {
2230 .owner = THIS_MODULE,
1da177e4 2231 .open = sg_proc_single_open_dressz,
828c0950
AD		 2232 .read = seq_read,
2233 .llseek = seq_lseek,
1da177e4
LT		 2234 .write = sg_proc_write_dressz,
2235 .release = single_release,
2236};
2237
2238static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2239static int sg_proc_single_open_version(struct inode *inode, struct file *file);
828c0950
AD		 2240static const struct file_operations version_fops = {
2241 .owner = THIS_MODULE,
1da177e4 2242 .open = sg_proc_single_open_version,
828c0950
AD		 2243 .read = seq_read,
2244 .llseek = seq_lseek,
1da177e4
LT		 2245 .release = single_release,
2246};
2247
2248static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2249static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
828c0950
AD		 2250static const struct file_operations devhdr_fops = {
2251 .owner = THIS_MODULE,
1da177e4 2252 .open = sg_proc_single_open_devhdr,
828c0950
AD		 2253 .read = seq_read,
2254 .llseek = seq_lseek,
1da177e4
LT		 2255 .release = single_release,
2256};
2257
2258static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2259static int sg_proc_open_dev(struct inode *inode, struct file *file);
2260static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2261static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2262static void dev_seq_stop(struct seq_file *s, void *v);
828c0950
AD		 2263static const struct file_operations dev_fops = {
2264 .owner = THIS_MODULE,
1da177e4 2265 .open = sg_proc_open_dev,
828c0950
AD		 2266 .read = seq_read,
2267 .llseek = seq_lseek,
1da177e4
LT		 2268 .release = seq_release,
2269};
88e9d34c 2270static const struct seq_operations dev_seq_ops = {
1da177e4
LT		 2271 .start = dev_seq_start,
2272 .next = dev_seq_next,
2273 .stop = dev_seq_stop,
2274 .show = sg_proc_seq_show_dev,
2275};
2276
2277static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2278static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
828c0950
AD		 2279static const struct file_operations devstrs_fops = {
2280 .owner = THIS_MODULE,
1da177e4 2281 .open = sg_proc_open_devstrs,
828c0950
AD		 2282 .read = seq_read,
2283 .llseek = seq_lseek,
1da177e4
LT		 2284 .release = seq_release,
2285};
88e9d34c 2286static const struct seq_operations devstrs_seq_ops = {
1da177e4
LT		 2287 .start = dev_seq_start,
2288 .next = dev_seq_next,
2289 .stop = dev_seq_stop,
2290 .show = sg_proc_seq_show_devstrs,
2291};
2292
2293static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2294static int sg_proc_open_debug(struct inode *inode, struct file *file);
828c0950
AD		 2295static const struct file_operations debug_fops = {
2296 .owner = THIS_MODULE,
1da177e4 2297 .open = sg_proc_open_debug,
828c0950
AD		 2298 .read = seq_read,
2299 .llseek = seq_lseek,
1da177e4
LT		 2300 .release = seq_release,
2301};
88e9d34c 2302static const struct seq_operations debug_seq_ops = {
1da177e4
LT		 2303 .start = dev_seq_start,
2304 .next = dev_seq_next,
2305 .stop = dev_seq_stop,
2306 .show = sg_proc_seq_show_debug,
2307};
2308
2309
2310struct sg_proc_leaf {
2311 const char * name;
828c0950 2312 const struct file_operations * fops;
1da177e4
LT		 2313};
2314
2315static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2316 {"allow_dio", &adio_fops},
2317 {"debug", &debug_fops},
2318 {"def_reserved_size", &dressz_fops},
2319 {"device_hdr", &devhdr_fops},
2320 {"devices", &dev_fops},
2321 {"device_strs", &devstrs_fops},
2322 {"version", &version_fops}
2323};
2324
2325static int
2326sg_proc_init(void)
2327{
6391a113 2328 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
d161a13f 2329 int k;
1da177e4 2330
66600221 2331 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2332 if (!sg_proc_sgp)
2333 return 1;
2334 for (k = 0; k < num_leaves; ++k) {
d161a13f
AV		 2335 struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2336 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f 2337 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2338 }
2339 return 0;
2340}
2341
2342static void
2343sg_proc_cleanup(void)
2344{
2345 int k;
6391a113 2346 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2347
2348 if (!sg_proc_sgp)
2349 return;
2350 for (k = 0; k < num_leaves; ++k)
2351 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2352 remove_proc_entry(sg_proc_sg_dirname, NULL);
2353}
2354
2355
2356static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2357{
2358 seq_printf(s, "%d\n", *((int *)s->private));
2359 return 0;
2360}
2361
2362static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2363{
2364 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2365}
2366
2367static ssize_t
2368sg_proc_write_adio(struct file *filp, const char __user *buffer,
2369 size_t count, loff_t *off)
2370{
7e95fffe
SB		 2371 int err;
2372 unsigned long num;
1da177e4
LT		 2373
2374 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2375 return -EACCES;
7e95fffe
SB		 2376 err = kstrtoul_from_user(buffer, count, 0, &num);
2377 if (err)
2378 return err;
2379 sg_allow_dio = num ? 1 : 0;
1da177e4
LT		 2380 return count;
2381}
2382
2383static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2384{
2385 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2386}
2387
2388static ssize_t
2389sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2390 size_t count, loff_t *off)
2391{
7e95fffe 2392 int err;
1da177e4 2393 unsigned long k = ULONG_MAX;
1da177e4
LT		 2394
2395 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2396 return -EACCES;
7e95fffe
SB		 2397
2398 err = kstrtoul_from_user(buffer, count, 0, &k);
2399 if (err)
2400 return err;
1da177e4
LT		 2401 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2402 sg_big_buff = k;
2403 return count;
2404 }
2405 return -ERANGE;
2406}
2407
2408static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2409{
2410 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2411 sg_version_date);
2412 return 0;
2413}
2414
2415static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2416{
2417 return single_open(file, sg_proc_seq_show_version, NULL);
2418}
2419
2420static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2421{
2422 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2423 "online\n");
2424 return 0;
2425}
2426
2427static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2428{
2429 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2430}
2431
2432struct sg_proc_deviter {
2433 loff_t index;
2434 size_t max;
2435};
2436
2437static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2438{
2439 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2440
729d70f5 2441 s->private = it;
1da177e4
LT		 2442 if (! it)
2443 return NULL;
729d70f5 2444
1da177e4
LT		 2445 it->index = *pos;
2446 it->max = sg_last_dev();
2447 if (it->index >= it->max)
729d70f5 2448 return NULL;
1da177e4 2449 return it;
1da177e4
LT		 2450}
2451
2452static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2453{
729d70f5 2454 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2455
2456 *pos = ++it->index;
2457 return (it->index < it->max) ? it : NULL;
2458}
2459
2460static void dev_seq_stop(struct seq_file *s, void *v)
2461{
729d70f5 2462 kfree(s->private);
1da177e4
LT		 2463}
2464
2465static int sg_proc_open_dev(struct inode *inode, struct file *file)
2466{
2467 return seq_open(file, &dev_seq_ops);
2468}
2469
2470static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2471{
2472 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2473 Sg_device *sdp;
2474 struct scsi_device *scsidp;
c6517b79 2475 unsigned long iflags;
1da177e4 2476
c6517b79
TB		 2477 read_lock_irqsave(&sg_index_lock, iflags);
2478 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2479 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2480 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2481 scsidp->host->host_no, scsidp->channel,
2482 scsidp->id, scsidp->lun, (int) scsidp->type,
2483 1,
2484 (int) scsidp->queue_depth,
2485 (int) scsidp->device_busy,
2486 (int) scsi_device_online(scsidp));
2487 else
2488 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
c6517b79 2489 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2490 return 0;
2491}
2492
2493static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2494{
2495 return seq_open(file, &devstrs_seq_ops);
2496}
2497
2498static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2499{
2500 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2501 Sg_device *sdp;
2502 struct scsi_device *scsidp;
c6517b79 2503 unsigned long iflags;
1da177e4 2504
c6517b79
TB		 2505 read_lock_irqsave(&sg_index_lock, iflags);
2506 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2507 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2508 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2509 scsidp->vendor, scsidp->model, scsidp->rev);
2510 else
2511 seq_printf(s, "<no active device>\n");
c6517b79 2512 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2513 return 0;
2514}
2515
c6517b79 2516/* must be called while holding sg_index_lock */
1da177e4
LT		 2517static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2518{
2519 int k, m, new_interface, blen, usg;
2520 Sg_request *srp;
2521 Sg_fd *fp;
2522 const sg_io_hdr_t *hp;
2523 const char * cp;
cb59e840 2524 unsigned int ms;
1da177e4 2525
3442f802
FT		 2526 k = 0;
2527 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2528 k++;
c6517b79 2529 read_lock(&fp->rq_list_lock); /* irqs already disabled */
1da177e4 2530 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3442f802 2531 "(res)sgat=%d low_dma=%d\n", k,
1da177e4
LT		 2532 jiffies_to_msecs(fp->timeout),
2533 fp->reserve.bufflen,
2534 (int) fp->reserve.k_use_sg,
2535 (int) fp->low_dma);
2536 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2537 (int) fp->cmd_q, (int) fp->force_packid,
2538 (int) fp->keep_orphan, (int) fp->closed);
c6517b79
TB		 2539 for (m = 0, srp = fp->headrp;
2540 srp != NULL;
2541 ++m, srp = srp->nextrp) {
1da177e4
LT		 2542 hp = &srp->header;
2543 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2544 if (srp->res_used) {
2545 if (new_interface &&
2546 (SG_FLAG_MMAP_IO & hp->flags))
2547 cp = " mmap>> ";
2548 else
2549 cp = " rb>> ";
2550 } else {
2551 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2552 cp = " dio>> ";
2553 else
2554 cp = " ";
2555 }
2556 seq_printf(s, cp);
d6b10348
MC		 2557 blen = srp->data.bufflen;
2558 usg = srp->data.k_use_sg;
1da177e4
LT		 2559 seq_printf(s, srp->done ?
2560 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2561 : "act:");
1da177e4
LT		 2562 seq_printf(s, " id=%d blen=%d",
2563 srp->header.pack_id, blen);
2564 if (srp->done)
2565 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 2566 else {
2567 ms = jiffies_to_msecs(jiffies);
1da177e4 2568 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 2569 (new_interface ? hp->timeout :
2570 jiffies_to_msecs(fp->timeout)),
2571 (ms > hp->duration ? ms - hp->duration : 0));
2572 }
1da177e4
LT		 2573 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2574 (int) srp->data.cmd_opcode);
2575 }
2576 if (0 == m)
2577 seq_printf(s, " No requests active\n");
c6517b79 2578 read_unlock(&fp->rq_list_lock);
1da177e4
LT		 2579 }
2580}
2581
2582static int sg_proc_open_debug(struct inode *inode, struct file *file)
2583{
2584 return seq_open(file, &debug_seq_ops);
2585}
2586
2587static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2588{
2589 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2590 Sg_device *sdp;
c6517b79 2591 unsigned long iflags;
1da177e4
LT		 2592
2593 if (it && (0 == it->index)) {
7c07d613
JB		 2594 seq_printf(s, "max_active_device=%d(origin 1)\n",
2595 (int)it->max);
1da177e4
LT		 2596 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2597 }
1da177e4 2598
c6517b79
TB		 2599 read_lock_irqsave(&sg_index_lock, iflags);
2600 sdp = it ? sg_lookup_dev(it->index) : NULL;
3442f802 2601 if (sdp && !list_empty(&sdp->sfds)) {
c6517b79 2602 struct scsi_device *scsidp = sdp->device;
1da177e4 2603
c6517b79
TB		 2604 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2605 if (sdp->detached)
2606 seq_printf(s, "detached pending close ");
2607 else
2608 seq_printf
2609 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2610 scsidp->host->host_no,
2611 scsidp->channel, scsidp->id,
2612 scsidp->lun,
2613 scsidp->host->hostt->emulated);
2614 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2615 sdp->sg_tablesize, sdp->exclude);
1da177e4
LT		 2616 sg_proc_debug_helper(s, sdp);
2617 }
c6517b79 2618 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2619 return 0;
2620}
2621
2622#endif /* CONFIG_SCSI_PROC_FS */
2623
2624module_init(init_sg);
2625module_exit(exit_sg);
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