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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:
65c26a0f 10 * Copyright (C) 1998 - 2014 Douglas Gilbert
1da177e4
LT		 11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 */
18
65c26a0f
DG		 19static int sg_version_num = 30536; /* 2 digits for each component */
20#define SG_VERSION_STR "3.5.36"
1da177e4
LT		 21
22/*
65c26a0f 23 * D. P. Gilbert (dgilbert@interlog.com), notes:
1da177e4
LT		 24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
26 * (otherwise the macros compile to empty statements).
27 *
28 */
1da177e4
LT		 29#include <linux/module.h>
30
31#include <linux/fs.h>
32#include <linux/kernel.h>
33#include <linux/sched.h>
34#include <linux/string.h>
35#include <linux/mm.h>
36#include <linux/errno.h>
37#include <linux/mtio.h>
38#include <linux/ioctl.h>
5a0e3ad6 39#include <linux/slab.h>
1da177e4
LT		 40#include <linux/fcntl.h>
41#include <linux/init.h>
42#include <linux/poll.h>
1da177e4 43#include <linux/moduleparam.h>
1da177e4 44#include <linux/cdev.h>
7c07d613 45#include <linux/idr.h>
1da177e4
LT		 46#include <linux/seq_file.h>
47#include <linux/blkdev.h>
48#include <linux/delay.h>
6da127ad 49#include <linux/blktrace_api.h>
c45d15d2 50#include <linux/mutex.h>
cc833acb 51#include <linux/atomic.h>
2fe038e3 52#include <linux/ratelimit.h>
e2e40f2c 53#include <linux/uio.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>
65c26a0f 66static char *sg_version_date = "20140603";
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
65c26a0f
DG		 76/* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type
77 * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater
78 * than 16 bytes are "variable length" whose length is a multiple of 4
79 */
80#define SG_MAX_CDB_SIZE 252
81
f8630bd7 82#define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
1da177e4
LT		 83
84int sg_big_buff = SG_DEF_RESERVED_SIZE;
85/* N.B. This variable is readable and writeable via
86 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
87 of this size (or less if there is not enough memory) will be reserved
88 for use by this file descriptor. [Deprecated usage: this variable is also
89 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
90 the kernel (i.e. it is not a module).] */
91static int def_reserved_size = -1; /* picks up init parameter */
92static int sg_allow_dio = SG_ALLOW_DIO_DEF;
93
6460e75a
DG		 94static int scatter_elem_sz = SG_SCATTER_SZ;
95static int scatter_elem_sz_prev = SG_SCATTER_SZ;
96
1da177e4 97#define SG_SECTOR_SZ 512
1da177e4 98
cc833acb
DG		 99static int sg_add_device(struct device *, struct class_interface *);
100static void sg_remove_device(struct device *, struct class_interface *);
98481ff0 101
7c07d613 102static DEFINE_IDR(sg_index_idr);
c0d3b9c2
JB		 103static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
104 file descriptor list for device */
1da177e4
LT		 105
106static struct class_interface sg_interface = {
cc833acb
DG		 107 .add_dev = sg_add_device,
108 .remove_dev = sg_remove_device,
1da177e4
LT		 109};
110
111typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
112 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 113 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4 114 unsigned bufflen; /* Size of (aggregate) data buffer */
10db10d1
FT		 115 struct page **pages;
116 int page_order;
1da177e4
LT		 117 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
118 unsigned char cmd_opcode; /* first byte of command */
119} Sg_scatter_hold;
120
121struct sg_device; /* forward declarations */
122struct sg_fd;
123
124typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 125 struct sg_request *nextrp; /* NULL -> tail request (slist) */
126 struct sg_fd *parentfp; /* NULL -> not in use */
127 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
128 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 129 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 130 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
131 char orphan; /* 1 -> drop on sight, 0 -> normal */
132 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
6acddc5e
JE		 133 /* done protected by rq_list_lock */
134 char done; /* 0->before bh, 1->before read, 2->read */
10865dfa 135 struct request *rq;
6e5a30cb 136 struct bio *bio;
c96952ed 137 struct execute_work ew;
1da177e4
LT		 138} Sg_request;
139
140typedef struct sg_fd { /* holds the state of a file descriptor */
cc833acb 141 struct list_head sfd_siblings; /* protected by device's sfd_lock */
1da177e4
LT		 142 struct sg_device *parentdp; /* owning device */
143 wait_queue_head_t read_wait; /* queue read until command done */
144 rwlock_t rq_list_lock; /* protect access to list in req_arr */
145 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
146 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
147 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
148 unsigned save_scat_len; /* original length of trunc. scat. element */
149 Sg_request *headrp; /* head of request slist, NULL->empty */
150 struct fasync_struct *async_qp; /* used by asynchronous notification */
151 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
152 char low_dma; /* as in parent but possibly overridden to 1 */
153 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
1da177e4 154 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
65c26a0f 155 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */
1da177e4
LT		 156 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
157 char mmap_called; /* 0 -> mmap() never called on this fd */
c6517b79
TB		 158 struct kref f_ref;
159 struct execute_work ew;
1da177e4
LT		 160} Sg_fd;
161
162typedef struct sg_device { /* holds the state of each scsi generic device */
163 struct scsi_device *device;
cc833acb
DG		 164 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */
165 struct mutex open_rel_lock; /* held when in open() or release() */
1da177e4 166 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 167 u32 index; /* device index number */
3442f802 168 struct list_head sfds;
cc833acb
DG		 169 rwlock_t sfd_lock; /* protect access to sfd list */
170 atomic_t detaching; /* 0->device usable, 1->device detaching */
171 bool exclude; /* 1->open(O_EXCL) succeeded and is active */
172 int open_cnt; /* count of opens (perhaps < num(sfds) ) */
1da177e4
LT		 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 191static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
95e159d6 192static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp);
1da177e4
LT		 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);
95e159d6 196static Sg_fd *sg_add_sfp(Sg_device * sdp);
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);
cc833acb 203static void sg_device_destroy(struct kref *kref);
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
95e159d6 210#define sg_printk(prefix, sdp, fmt, a...) \
22e0d994
HR		 211 sdev_prefix_printk(prefix, (sdp)->device, \
212 (sdp)->disk->disk_name, fmt, ##a)
95e159d6 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
cc833acb
DG		 224static int
225open_wait(Sg_device *sdp, int flags)
98481ff0 226{
cc833acb 227 int retval = 0;
98481ff0 228
cc833acb
DG		 229 if (flags & O_EXCL) {
230 while (sdp->open_cnt > 0) {
231 mutex_unlock(&sdp->open_rel_lock);
232 retval = wait_event_interruptible(sdp->open_wait,
233 (atomic_read(&sdp->detaching) ||
234 !sdp->open_cnt));
235 mutex_lock(&sdp->open_rel_lock);
236
237 if (retval) /* -ERESTARTSYS */
238 return retval;
239 if (atomic_read(&sdp->detaching))
240 return -ENODEV;
241 }
242 } else {
243 while (sdp->exclude) {
244 mutex_unlock(&sdp->open_rel_lock);
245 retval = wait_event_interruptible(sdp->open_wait,
246 (atomic_read(&sdp->detaching) ||
247 !sdp->exclude));
248 mutex_lock(&sdp->open_rel_lock);
249
250 if (retval) /* -ERESTARTSYS */
251 return retval;
252 if (atomic_read(&sdp->detaching))
253 return -ENODEV;
254 }
255 }
035d12e6 256
cc833acb 257 return retval;
035d12e6
JE		 258}
259
cc833acb 260/* Returns 0 on success, else a negated errno value */
1da177e4
LT		 261static int
262sg_open(struct inode *inode, struct file *filp)
263{
264 int dev = iminor(inode);
265 int flags = filp->f_flags;
d6b10348 266 struct request_queue *q;
1da177e4
LT		 267 Sg_device *sdp;
268 Sg_fd *sfp;
1da177e4
LT		 269 int retval;
270
271 nonseekable_open(inode, filp);
cc833acb
DG		 272 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
273 return -EPERM; /* Can't lock it with read only access */
1da177e4 274 sdp = sg_get_dev(dev);
cc833acb
DG		 275 if (IS_ERR(sdp))
276 return PTR_ERR(sdp);
1da177e4 277
95e159d6
HR		 278 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
279 "sg_open: flags=0x%x\n", flags));
280
1da177e4
LT		 281 /* This driver's module count bumped by fops_get in <linux/fs.h> */
282 /* Prevent the device driver from vanishing while we sleep */
283 retval = scsi_device_get(sdp->device);
c6517b79
TB		 284 if (retval)
285 goto sg_put;
1da177e4 286
bc4f2401
AS		 287 retval = scsi_autopm_get_device(sdp->device);
288 if (retval)
289 goto sdp_put;
290
cc833acb
DG		 291 /* scsi_block_when_processing_errors() may block so bypass
292 * check if O_NONBLOCK. Permits SCSI commands to be issued
293 * during error recovery. Tread carefully. */
1da177e4
LT		 294 if (!((flags & O_NONBLOCK) ||
295 scsi_block_when_processing_errors(sdp->device))) {
296 retval = -ENXIO;
297 /* we are in error recovery for this device */
298 goto error_out;
299 }
300
cc833acb
DG		 301 mutex_lock(&sdp->open_rel_lock);
302 if (flags & O_NONBLOCK) {
303 if (flags & O_EXCL) {
304 if (sdp->open_cnt > 0) {
305 retval = -EBUSY;
306 goto error_mutex_locked;
307 }
308 } else {
309 if (sdp->exclude) {
310 retval = -EBUSY;
311 goto error_mutex_locked;
312 }
1da177e4 313 }
cc833acb
DG		 314 } else {
315 retval = open_wait(sdp, flags);
316 if (retval) /* -ERESTARTSYS or -ENODEV */
317 goto error_mutex_locked;
1da177e4 318 }
cc833acb
DG		 319
320 /* N.B. at this point we are holding the open_rel_lock */
321 if (flags & O_EXCL)
322 sdp->exclude = true;
323
324 if (sdp->open_cnt < 1) { /* no existing opens */
1da177e4 325 sdp->sgdebug = 0;
d6b10348 326 q = sdp->device->request_queue;
8a78362c 327 sdp->sg_tablesize = queue_max_segments(q);
1da177e4 328 }
95e159d6 329 sfp = sg_add_sfp(sdp);
cc833acb
DG		 330 if (IS_ERR(sfp)) {
331 retval = PTR_ERR(sfp);
332 goto out_undo;
065b4a2f 333 }
cc833acb
DG		 334
335 filp->private_data = sfp;
336 sdp->open_cnt++;
337 mutex_unlock(&sdp->open_rel_lock);
338
065b4a2f 339 retval = 0;
c6517b79 340sg_put:
cc833acb 341 kref_put(&sdp->d_ref, sg_device_destroy);
1da177e4 342 return retval;
cc833acb
DG		 343
344out_undo:
345 if (flags & O_EXCL) {
346 sdp->exclude = false; /* undo if error */
347 wake_up_interruptible(&sdp->open_wait);
348 }
349error_mutex_locked:
350 mutex_unlock(&sdp->open_rel_lock);
351error_out:
352 scsi_autopm_put_device(sdp->device);
353sdp_put:
354 scsi_device_put(sdp->device);
355 goto sg_put;
1da177e4
LT		 356}
357
cc833acb
DG		 358/* Release resources associated with a successful sg_open()
359 * Returns 0 on success, else a negated errno value */
1da177e4
LT		 360static int
361sg_release(struct inode *inode, struct file *filp)
362{
363 Sg_device *sdp;
364 Sg_fd *sfp;
365
366 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
367 return -ENXIO;
95e159d6 368 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
c6517b79 369
cc833acb 370 mutex_lock(&sdp->open_rel_lock);
bc4f2401 371 scsi_autopm_put_device(sdp->device);
c6517b79 372 kref_put(&sfp->f_ref, sg_remove_sfp);
cc833acb
DG		 373 sdp->open_cnt--;
374
375 /* possibly many open()s waiting on exlude clearing, start many;
376 * only open(O_EXCL)s wait on 0==open_cnt so only start one */
377 if (sdp->exclude) {
378 sdp->exclude = false;
379 wake_up_interruptible_all(&sdp->open_wait);
380 } else if (0 == sdp->open_cnt) {
381 wake_up_interruptible(&sdp->open_wait);
382 }
383 mutex_unlock(&sdp->open_rel_lock);
1da177e4
LT		 384 return 0;
385}
386
387static ssize_t
388sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
389{
1da177e4
LT		 390 Sg_device *sdp;
391 Sg_fd *sfp;
392 Sg_request *srp;
393 int req_pack_id = -1;
1da177e4 394 sg_io_hdr_t *hp;
cb59e840
DG		 395 struct sg_header *old_hdr = NULL;
396 int retval = 0;
1da177e4
LT		 397
398 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
399 return -ENXIO;
95e159d6
HR		 400 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
401 "sg_read: count=%d\n", (int) count));
d6b10348 402
1da177e4
LT		 403 if (!access_ok(VERIFY_WRITE, buf, count))
404 return -EFAULT;
405 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840
DG		 406 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
407 if (!old_hdr)
408 return -ENOMEM;
409 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
410 retval = -EFAULT;
411 goto free_old_hdr;
412 }
413 if (old_hdr->reply_len < 0) {
1da177e4 414 if (count >= SZ_SG_IO_HDR) {
cb59e840
DG		 415 sg_io_hdr_t *new_hdr;
416 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
417 if (!new_hdr) {
418 retval = -ENOMEM;
419 goto free_old_hdr;
420 }
421 retval =__copy_from_user
422 (new_hdr, buf, SZ_SG_IO_HDR);
423 req_pack_id = new_hdr->pack_id;
424 kfree(new_hdr);
425 if (retval) {
426 retval = -EFAULT;
427 goto free_old_hdr;
428 }
1da177e4
LT		 429 }
430 } else
cb59e840 431 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 432 }
433 srp = sg_get_rq_mark(sfp, req_pack_id);
434 if (!srp) { /* now wait on packet to arrive */
cc833acb 435 if (atomic_read(&sdp->detaching)) {
cb59e840
DG		 436 retval = -ENODEV;
437 goto free_old_hdr;
438 }
439 if (filp->f_flags & O_NONBLOCK) {
440 retval = -EAGAIN;
441 goto free_old_hdr;
442 }
3f0c6aba 443 retval = wait_event_interruptible(sfp->read_wait,
cc833acb 444 (atomic_read(&sdp->detaching) ||
3f0c6aba 445 (srp = sg_get_rq_mark(sfp, req_pack_id))));
cc833acb 446 if (atomic_read(&sdp->detaching)) {
794c10fa
JE		 447 retval = -ENODEV;
448 goto free_old_hdr;
449 }
450 if (retval) {
cb59e840
DG		 451 /* -ERESTARTSYS as signal hit process */
452 goto free_old_hdr;
1da177e4
LT		 453 }
454 }
cb59e840
DG		 455 if (srp->header.interface_id != '\0') {
456 retval = sg_new_read(sfp, buf, count, srp);
457 goto free_old_hdr;
458 }
1da177e4
LT		 459
460 hp = &srp->header;
cb59e840
DG		 461 if (old_hdr == NULL) {
462 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
463 if (! old_hdr) {
464 retval = -ENOMEM;
465 goto free_old_hdr;
466 }
467 }
468 memset(old_hdr, 0, SZ_SG_HEADER);
469 old_hdr->reply_len = (int) hp->timeout;
470 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
471 old_hdr->pack_id = hp->pack_id;
472 old_hdr->twelve_byte =
1da177e4 473 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840
DG		 474 old_hdr->target_status = hp->masked_status;
475 old_hdr->host_status = hp->host_status;
476 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 477 if ((CHECK_CONDITION & hp->masked_status) ||
478 (DRIVER_SENSE & hp->driver_status))
cb59e840
DG		 479 memcpy(old_hdr->sense_buffer, srp->sense_b,
480 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 481 switch (hp->host_status) {
482 /* This setup of 'result' is for backward compatibility and is best
483 ignored by the user who should use target, host + driver status */
484 case DID_OK:
485 case DID_PASSTHROUGH:
486 case DID_SOFT_ERROR:
cb59e840 487 old_hdr->result = 0;
1da177e4
LT		 488 break;
489 case DID_NO_CONNECT:
490 case DID_BUS_BUSY:
491 case DID_TIME_OUT:
cb59e840 492 old_hdr->result = EBUSY;
1da177e4
LT		 493 break;
494 case DID_BAD_TARGET:
495 case DID_ABORT:
496 case DID_PARITY:
497 case DID_RESET:
498 case DID_BAD_INTR:
cb59e840 499 old_hdr->result = EIO;
1da177e4
LT		 500 break;
501 case DID_ERROR:
cb59e840 502 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 503 hp->masked_status == GOOD) ? 0 : EIO;
504 break;
505 default:
cb59e840 506 old_hdr->result = EIO;
1da177e4
LT		 507 break;
508 }
509
510 /* Now copy the result back to the user buffer. */
511 if (count >= SZ_SG_HEADER) {
cb59e840
DG		 512 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
513 retval = -EFAULT;
514 goto free_old_hdr;
515 }
1da177e4 516 buf += SZ_SG_HEADER;
cb59e840
DG		 517 if (count > old_hdr->reply_len)
518 count = old_hdr->reply_len;
1da177e4 519 if (count > SZ_SG_HEADER) {
cb59e840
DG		 520 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
521 retval = -EFAULT;
522 goto free_old_hdr;
523 }
1da177e4
LT		 524 }
525 } else
cb59e840 526 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 527 sg_finish_rem_req(srp);
cb59e840
DG		 528 retval = count;
529free_old_hdr:
c9475cb0 530 kfree(old_hdr);
cb59e840 531 return retval;
1da177e4
LT		 532}
533
534static ssize_t
535sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
536{
537 sg_io_hdr_t *hp = &srp->header;
3b524a68 538 int err = 0, err2;
1da177e4
LT		 539 int len;
540
541 if (count < SZ_SG_IO_HDR) {
542 err = -EINVAL;
543 goto err_out;
544 }
545 hp->sb_len_wr = 0;
546 if ((hp->mx_sb_len > 0) && hp->sbp) {
547 if ((CHECK_CONDITION & hp->masked_status) ||
548 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 549 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 550 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
551 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
552 len = (len > sb_len) ? sb_len : len;
553 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
554 err = -EFAULT;
555 goto err_out;
556 }
557 hp->sb_len_wr = len;
558 }
559 }
560 if (hp->masked_status || hp->host_status || hp->driver_status)
561 hp->info |= SG_INFO_CHECK;
562 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
563 err = -EFAULT;
564 goto err_out;
565 }
0b6cb26c 566err_out:
3b524a68
TB		 567 err2 = sg_finish_rem_req(srp);
568 return err ? : err2 ? : count;
1da177e4
LT		 569}
570
571static ssize_t
572sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
573{
574 int mxsize, cmd_size, k;
575 int input_size, blocking;
576 unsigned char opcode;
577 Sg_device *sdp;
578 Sg_fd *sfp;
579 Sg_request *srp;
580 struct sg_header old_hdr;
581 sg_io_hdr_t *hp;
65c26a0f 582 unsigned char cmnd[SG_MAX_CDB_SIZE];
1da177e4 583
128394ef
AV		 584 if (unlikely(segment_eq(get_fs(), KERNEL_DS)))
585 return -EINVAL;
586
1da177e4
LT		 587 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
588 return -ENXIO;
95e159d6
HR		 589 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
590 "sg_write: count=%d\n", (int) count));
cc833acb 591 if (atomic_read(&sdp->detaching))
1da177e4
LT		 592 return -ENODEV;
593 if (!((filp->f_flags & O_NONBLOCK) ||
594 scsi_block_when_processing_errors(sdp->device)))
595 return -ENXIO;
596
597 if (!access_ok(VERIFY_READ, buf, count))
598 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
599 if (count < SZ_SG_HEADER)
600 return -EIO;
601 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
602 return -EFAULT;
603 blocking = !(filp->f_flags & O_NONBLOCK);
604 if (old_hdr.reply_len < 0)
a2dd3b4c
TB		 605 return sg_new_write(sfp, filp, buf, count,
606 blocking, 0, 0, NULL);
1da177e4
LT		 607 if (count < (SZ_SG_HEADER + 6))
608 return -EIO; /* The minimum scsi command length is 6 bytes. */
609
610 if (!(srp = sg_add_request(sfp))) {
95e159d6
HR		 611 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
612 "sg_write: queue full\n"));
1da177e4
LT		 613 return -EDOM;
614 }
615 buf += SZ_SG_HEADER;
616 __get_user(opcode, buf);
617 if (sfp->next_cmd_len > 0) {
1da177e4
LT		 618 cmd_size = sfp->next_cmd_len;
619 sfp->next_cmd_len = 0; /* reset so only this write() effected */
620 } else {
621 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
622 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
623 cmd_size = 12;
624 }
95e159d6 625 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1da177e4
LT		 626 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
627/* Determine buffer size. */
628 input_size = count - cmd_size;
629 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
630 mxsize -= SZ_SG_HEADER;
631 input_size -= SZ_SG_HEADER;
632 if (input_size < 0) {
633 sg_remove_request(sfp, srp);
634 return -EIO; /* User did not pass enough bytes for this command. */
635 }
636 hp = &srp->header;
637 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
638 hp->cmd_len = (unsigned char) cmd_size;
639 hp->iovec_count = 0;
640 hp->mx_sb_len = 0;
641 if (input_size > 0)
642 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
643 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
644 else
645 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
646 hp->dxfer_len = mxsize;
5ecee0a3
DG		 647 if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||
648 (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV))
fad7f01e
FT		 649 hp->dxferp = (char __user *)buf + cmd_size;
650 else
651 hp->dxferp = NULL;
1da177e4
LT		 652 hp->sbp = NULL;
653 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
654 hp->flags = input_size; /* structure abuse ... */
655 hp->pack_id = old_hdr.pack_id;
656 hp->usr_ptr = NULL;
657 if (__copy_from_user(cmnd, buf, cmd_size))
658 return -EFAULT;
659 /*
660 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
661 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
662 * is a non-zero input_size, so emit a warning.
663 */
eaa3e22e
AK		 664 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
665 static char cmd[TASK_COMM_LEN];
2fe038e3
CD		 666 if (strcmp(current->comm, cmd)) {
667 printk_ratelimited(KERN_WARNING
668 "sg_write: data in/out %d/%d bytes "
669 "for SCSI command 0x%x-- guessing "
670 "data in;\n program %s not setting "
671 "count and/or reply_len properly\n",
672 old_hdr.reply_len - (int)SZ_SG_HEADER,
673 input_size, (unsigned int) cmnd[0],
674 current->comm);
eaa3e22e
AK		 675 strcpy(cmd, current->comm);
676 }
677 }
1da177e4
LT		 678 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
679 return (k < 0) ? k : count;
680}
681
682static ssize_t
0b07de85 683sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
a2dd3b4c 684 size_t count, int blocking, int read_only, int sg_io_owned,
0b07de85 685 Sg_request **o_srp)
1da177e4
LT		 686{
687 int k;
688 Sg_request *srp;
689 sg_io_hdr_t *hp;
65c26a0f 690 unsigned char cmnd[SG_MAX_CDB_SIZE];
1da177e4
LT		 691 int timeout;
692 unsigned long ul_timeout;
693
694 if (count < SZ_SG_IO_HDR)
695 return -EINVAL;
696 if (!access_ok(VERIFY_READ, buf, count))
697 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
698
699 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
700 if (!(srp = sg_add_request(sfp))) {
95e159d6
HR		 701 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
702 "sg_new_write: queue full\n"));
1da177e4
LT		 703 return -EDOM;
704 }
a2dd3b4c 705 srp->sg_io_owned = sg_io_owned;
1da177e4
LT		 706 hp = &srp->header;
707 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
708 sg_remove_request(sfp, srp);
709 return -EFAULT;
710 }
711 if (hp->interface_id != 'S') {
712 sg_remove_request(sfp, srp);
713 return -ENOSYS;
714 }
715 if (hp->flags & SG_FLAG_MMAP_IO) {
716 if (hp->dxfer_len > sfp->reserve.bufflen) {
717 sg_remove_request(sfp, srp);
718 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
719 }
720 if (hp->flags & SG_FLAG_DIRECT_IO) {
721 sg_remove_request(sfp, srp);
722 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
723 }
724 if (sg_res_in_use(sfp)) {
725 sg_remove_request(sfp, srp);
726 return -EBUSY; /* reserve buffer already being used */
727 }
728 }
729 ul_timeout = msecs_to_jiffies(srp->header.timeout);
730 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
731 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
732 sg_remove_request(sfp, srp);
733 return -EMSGSIZE;
734 }
735 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
736 sg_remove_request(sfp, srp);
737 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
738 }
739 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
740 sg_remove_request(sfp, srp);
741 return -EFAULT;
742 }
14e507b8 743 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 744 sg_remove_request(sfp, srp);
745 return -EPERM;
746 }
747 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
748 if (k < 0)
749 return k;
750 if (o_srp)
751 *o_srp = srp;
752 return count;
753}
754
755static int
756sg_common_write(Sg_fd * sfp, Sg_request * srp,
757 unsigned char *cmnd, int timeout, int blocking)
758{
5af2e382 759 int k, at_head;
1da177e4
LT		 760 Sg_device *sdp = sfp->parentdp;
761 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 762
763 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
764 hp->status = 0;
765 hp->masked_status = 0;
766 hp->msg_status = 0;
767 hp->info = 0;
768 hp->host_status = 0;
769 hp->driver_status = 0;
770 hp->resid = 0;
95e159d6
HR		 771 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
772 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
773 (int) cmnd[0], (int) hp->cmd_len));
1da177e4 774
10865dfa
FT		 775 k = sg_start_req(srp, cmnd);
776 if (k) {
95e159d6
HR		 777 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
778 "sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 779 sg_finish_rem_req(srp);
780 return k; /* probably out of space --> ENOMEM */
781 }
cc833acb 782 if (atomic_read(&sdp->detaching)) {
f3951a37
CO		 783 if (srp->bio) {
784 if (srp->rq->cmd != srp->rq->__cmd)
785 kfree(srp->rq->cmd);
786
caf19d38 787 blk_end_request_all(srp->rq, -EIO);
f3951a37
CO		 788 srp->rq = NULL;
789 }
790
1da177e4
LT		 791 sg_finish_rem_req(srp);
792 return -ENODEV;
793 }
1da177e4 794
cb59e840 795 hp->duration = jiffies_to_msecs(jiffies);
16070cc1
DG		 796 if (hp->interface_id != '\0' && /* v3 (or later) interface */
797 (SG_FLAG_Q_AT_TAIL & hp->flags))
798 at_head = 0;
799 else
800 at_head = 1;
10db10d1
FT		 801
802 srp->rq->timeout = timeout;
c6517b79 803 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
10db10d1 804 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
16070cc1 805 srp->rq, at_head, sg_rq_end_io);
10db10d1 806 return 0;
1da177e4
LT		 807}
808
6acddc5e
JE		 809static int srp_done(Sg_fd *sfp, Sg_request *srp)
810{
811 unsigned long flags;
812 int ret;
813
814 read_lock_irqsave(&sfp->rq_list_lock, flags);
815 ret = srp->done;
816 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
817 return ret;
818}
819
46f69e6a
AM		 820static int max_sectors_bytes(struct request_queue *q)
821{
822 unsigned int max_sectors = queue_max_sectors(q);
823
824 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
825
826 return max_sectors << 9;
827}
828
37b9d1e0 829static long
f4927c45 830sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 831{
832 void __user *p = (void __user *)arg;
833 int __user *ip = p;
176aa9d6 834 int result, val, read_only;
1da177e4
LT		 835 Sg_device *sdp;
836 Sg_fd *sfp;
837 Sg_request *srp;
838 unsigned long iflags;
839
840 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
841 return -ENXIO;
abf54393 842
95e159d6
HR		 843 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
844 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
1da177e4
LT		 845 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
846
847 switch (cmd_in) {
848 case SG_IO:
cc833acb 849 if (atomic_read(&sdp->detaching))
dddbf8d9
JE		 850 return -ENODEV;
851 if (!scsi_block_when_processing_errors(sdp->device))
852 return -ENXIO;
853 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
854 return -EFAULT;
855 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
856 1, read_only, 1, &srp);
857 if (result < 0)
858 return result;
3f0c6aba 859 result = wait_event_interruptible(sfp->read_wait,
cc833acb
DG		 860 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
861 if (atomic_read(&sdp->detaching))
794c10fa
JE		 862 return -ENODEV;
863 write_lock_irq(&sfp->rq_list_lock);
864 if (srp->done) {
865 srp->done = 2;
dddbf8d9 866 write_unlock_irq(&sfp->rq_list_lock);
794c10fa
JE		 867 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
868 return (result < 0) ? result : 0;
1da177e4 869 }
794c10fa
JE		 870 srp->orphan = 1;
871 write_unlock_irq(&sfp->rq_list_lock);
872 return result; /* -ERESTARTSYS because signal hit process */
1da177e4
LT		 873 case SG_SET_TIMEOUT:
874 result = get_user(val, ip);
875 if (result)
876 return result;
877 if (val < 0)
878 return -EIO;
f8630bd7
PB		 879 if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ))
880 val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ),
b9b6e80a 881 INT_MAX);
1da177e4 882 sfp->timeout_user = val;
f8630bd7 883 sfp->timeout = mult_frac(val, HZ, USER_HZ);
1da177e4
LT		 884
885 return 0;
886 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
887 /* strange ..., for backward compatibility */
888 return sfp->timeout_user;
889 case SG_SET_FORCE_LOW_DMA:
890 result = get_user(val, ip);
891 if (result)
892 return result;
893 if (val) {
894 sfp->low_dma = 1;
895 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
896 val = (int) sfp->reserve.bufflen;
95e159d6 897 sg_remove_scat(sfp, &sfp->reserve);
1da177e4
LT		 898 sg_build_reserve(sfp, val);
899 }
900 } else {
cc833acb 901 if (atomic_read(&sdp->detaching))
1da177e4
LT		 902 return -ENODEV;
903 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
904 }
905 return 0;
906 case SG_GET_LOW_DMA:
907 return put_user((int) sfp->low_dma, ip);
908 case SG_GET_SCSI_ID:
909 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
910 return -EFAULT;
911 else {
912 sg_scsi_id_t __user *sg_idp = p;
913
cc833acb 914 if (atomic_read(&sdp->detaching))
1da177e4
LT		 915 return -ENODEV;
916 __put_user((int) sdp->device->host->host_no,
917 &sg_idp->host_no);
918 __put_user((int) sdp->device->channel,
919 &sg_idp->channel);
920 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
921 __put_user((int) sdp->device->lun, &sg_idp->lun);
922 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
923 __put_user((short) sdp->device->host->cmd_per_lun,
924 &sg_idp->h_cmd_per_lun);
925 __put_user((short) sdp->device->queue_depth,
926 &sg_idp->d_queue_depth);
927 __put_user(0, &sg_idp->unused[0]);
928 __put_user(0, &sg_idp->unused[1]);
929 return 0;
930 }
931 case SG_SET_FORCE_PACK_ID:
932 result = get_user(val, ip);
933 if (result)
934 return result;
935 sfp->force_packid = val ? 1 : 0;
936 return 0;
937 case SG_GET_PACK_ID:
938 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
939 return -EFAULT;
940 read_lock_irqsave(&sfp->rq_list_lock, iflags);
941 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
942 if ((1 == srp->done) && (!srp->sg_io_owned)) {
943 read_unlock_irqrestore(&sfp->rq_list_lock,
944 iflags);
945 __put_user(srp->header.pack_id, ip);
946 return 0;
947 }
948 }
949 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
950 __put_user(-1, ip);
951 return 0;
952 case SG_GET_NUM_WAITING:
953 read_lock_irqsave(&sfp->rq_list_lock, iflags);
954 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
955 if ((1 == srp->done) && (!srp->sg_io_owned))
956 ++val;
957 }
958 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
959 return put_user(val, ip);
960 case SG_GET_SG_TABLESIZE:
961 return put_user(sdp->sg_tablesize, ip);
962 case SG_SET_RESERVED_SIZE:
963 result = get_user(val, ip);
964 if (result)
965 return result;
966 if (val < 0)
967 return -EINVAL;
44ec9542 968 val = min_t(int, val,
46f69e6a 969 max_sectors_bytes(sdp->device->request_queue));
1da177e4
LT		 970 if (val != sfp->reserve.bufflen) {
971 if (sg_res_in_use(sfp) || sfp->mmap_called)
972 return -EBUSY;
95e159d6 973 sg_remove_scat(sfp, &sfp->reserve);
1da177e4
LT		 974 sg_build_reserve(sfp, val);
975 }
976 return 0;
977 case SG_GET_RESERVED_SIZE:
44ec9542 978 val = min_t(int, sfp->reserve.bufflen,
46f69e6a 979 max_sectors_bytes(sdp->device->request_queue));
1da177e4
LT		 980 return put_user(val, ip);
981 case SG_SET_COMMAND_Q:
982 result = get_user(val, ip);
983 if (result)
984 return result;
985 sfp->cmd_q = val ? 1 : 0;
986 return 0;
987 case SG_GET_COMMAND_Q:
988 return put_user((int) sfp->cmd_q, ip);
989 case SG_SET_KEEP_ORPHAN:
990 result = get_user(val, ip);
991 if (result)
992 return result;
993 sfp->keep_orphan = val;
994 return 0;
995 case SG_GET_KEEP_ORPHAN:
996 return put_user((int) sfp->keep_orphan, ip);
997 case SG_NEXT_CMD_LEN:
998 result = get_user(val, ip);
999 if (result)
1000 return result;
a7319578 1001 if (val > SG_MAX_CDB_SIZE)
1002 return -ENOMEM;
1da177e4
LT		 1003 sfp->next_cmd_len = (val > 0) ? val : 0;
1004 return 0;
1005 case SG_GET_VERSION_NUM:
1006 return put_user(sg_version_num, ip);
1007 case SG_GET_ACCESS_COUNT:
1008 /* faked - we don't have a real access count anymore */
1009 val = (sdp->device ? 1 : 0);
1010 return put_user(val, ip);
1011 case SG_GET_REQUEST_TABLE:
1012 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1013 return -EFAULT;
1014 else {
cb59e840
DG		 1015 sg_req_info_t *rinfo;
1016 unsigned int ms;
1017
1018 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1019 GFP_KERNEL);
1020 if (!rinfo)
1021 return -ENOMEM;
1da177e4
LT		 1022 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1023 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1024 ++val, srp = srp ? srp->nextrp : srp) {
1025 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1026 if (srp) {
1027 rinfo[val].req_state = srp->done + 1;
1028 rinfo[val].problem =
1029 srp->header.masked_status &
1030 srp->header.host_status &
1031 srp->header.driver_status;
cb59e840
DG		 1032 if (srp->done)
1033 rinfo[val].duration =
1034 srp->header.duration;
1035 else {
1036 ms = jiffies_to_msecs(jiffies);
1037 rinfo[val].duration =
1038 (ms > srp->header.duration) ?
1039 (ms - srp->header.duration) : 0;
1040 }
1da177e4 1041 rinfo[val].orphan = srp->orphan;
cb59e840
DG		 1042 rinfo[val].sg_io_owned =
1043 srp->sg_io_owned;
1044 rinfo[val].pack_id =
1045 srp->header.pack_id;
1046 rinfo[val].usr_ptr =
1047 srp->header.usr_ptr;
1da177e4
LT		 1048 }
1049 }
1050 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840
DG		 1051 result = __copy_to_user(p, rinfo,
1052 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1053 result = result ? -EFAULT : 0;
1054 kfree(rinfo);
1055 return result;
1da177e4
LT		 1056 }
1057 case SG_EMULATED_HOST:
cc833acb 1058 if (atomic_read(&sdp->detaching))
1da177e4
LT		 1059 return -ENODEV;
1060 return put_user(sdp->device->host->hostt->emulated, ip);
1da177e4 1061 case SCSI_IOCTL_SEND_COMMAND:
cc833acb 1062 if (atomic_read(&sdp->detaching))
1da177e4
LT		 1063 return -ENODEV;
1064 if (read_only) {
1065 unsigned char opcode = WRITE_6;
1066 Scsi_Ioctl_Command __user *siocp = p;
1067
1068 if (copy_from_user(&opcode, siocp->data, 1))
1069 return -EFAULT;
14e507b8 1070 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1071 return -EPERM;
1072 }
e915e872 1073 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1da177e4
LT		 1074 case SG_SET_DEBUG:
1075 result = get_user(val, ip);
1076 if (result)
1077 return result;
1078 sdp->sgdebug = (char) val;
1079 return 0;
44ec9542 1080 case BLKSECTGET:
46f69e6a 1081 return put_user(max_sectors_bytes(sdp->device->request_queue),
44ec9542 1082 ip);
6da127ad
CS		 1083 case BLKTRACESETUP:
1084 return blk_trace_setup(sdp->device->request_queue,
1085 sdp->disk->disk_name,
76e3a19d 1086 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
d0deef5b 1087 NULL,
6da127ad
CS		 1088 (char *)arg);
1089 case BLKTRACESTART:
1090 return blk_trace_startstop(sdp->device->request_queue, 1);
1091 case BLKTRACESTOP:
1092 return blk_trace_startstop(sdp->device->request_queue, 0);
1093 case BLKTRACETEARDOWN:
1094 return blk_trace_remove(sdp->device->request_queue);
906d15fb
CH		 1095 case SCSI_IOCTL_GET_IDLUN:
1096 case SCSI_IOCTL_GET_BUS_NUMBER:
1097 case SCSI_IOCTL_PROBE_HOST:
1098 case SG_GET_TRANSFORM:
1099 case SG_SCSI_RESET:
1100 if (atomic_read(&sdp->detaching))
1101 return -ENODEV;
1102 break;
1da177e4
LT		 1103 default:
1104 if (read_only)
1105 return -EPERM; /* don't know so take safe approach */
906d15fb 1106 break;
1da177e4 1107 }
906d15fb
CH		 1108
1109 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1110 cmd_in, filp->f_flags & O_NDELAY);
1111 if (result)
1112 return result;
1113 return scsi_ioctl(sdp->device, cmd_in, p);
1da177e4
LT		 1114}
1115
1116#ifdef CONFIG_COMPAT
1117static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1118{
1119 Sg_device *sdp;
1120 Sg_fd *sfp;
1121 struct scsi_device *sdev;
1122
1123 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1124 return -ENXIO;
1125
1126 sdev = sdp->device;
1127 if (sdev->host->hostt->compat_ioctl) {
1128 int ret;
1129
1130 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1131
1132 return ret;
1133 }
1134
1135 return -ENOIOCTLCMD;
1136}
1137#endif
1138
1139static unsigned int
1140sg_poll(struct file *filp, poll_table * wait)
1141{
1142 unsigned int res = 0;
1143 Sg_device *sdp;
1144 Sg_fd *sfp;
1145 Sg_request *srp;
1146 int count = 0;
1147 unsigned long iflags;
1148
ebaf466b
JE		 1149 sfp = filp->private_data;
1150 if (!sfp)
1151 return POLLERR;
1152 sdp = sfp->parentdp;
1153 if (!sdp)
1da177e4
LT		 1154 return POLLERR;
1155 poll_wait(filp, &sfp->read_wait, wait);
1156 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1157 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1158 /* if any read waiting, flag it */
1159 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1160 res = POLLIN | POLLRDNORM;
1161 ++count;
1162 }
1163 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1164
cc833acb 1165 if (atomic_read(&sdp->detaching))
1da177e4
LT		 1166 res |= POLLHUP;
1167 else if (!sfp->cmd_q) {
1168 if (0 == count)
1169 res |= POLLOUT | POLLWRNORM;
1170 } else if (count < SG_MAX_QUEUE)
1171 res |= POLLOUT | POLLWRNORM;
95e159d6
HR		 1172 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1173 "sg_poll: res=0x%x\n", (int) res));
1da177e4
LT		 1174 return res;
1175}
1176
1177static int
1178sg_fasync(int fd, struct file *filp, int mode)
1179{
1da177e4
LT		 1180 Sg_device *sdp;
1181 Sg_fd *sfp;
1182
1183 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1184 return -ENXIO;
95e159d6
HR		 1185 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1186 "sg_fasync: mode=%d\n", mode));
1da177e4 1187
60aa4924 1188 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1da177e4
LT		 1189}
1190
a13ff0bb
NP		 1191static int
1192sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1193{
1194 Sg_fd *sfp;
d6b10348 1195 unsigned long offset, len, sa;
1da177e4 1196 Sg_scatter_hold *rsv_schp;
10db10d1 1197 int k, length;
1da177e4
LT		 1198
1199 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1200 return VM_FAULT_SIGBUS;
1da177e4 1201 rsv_schp = &sfp->reserve;
a13ff0bb 1202 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1203 if (offset >= rsv_schp->bufflen)
a13ff0bb 1204 return VM_FAULT_SIGBUS;
95e159d6
HR		 1205 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1206 "sg_vma_fault: offset=%lu, scatg=%d\n",
1207 offset, rsv_schp->k_use_sg));
d6b10348 1208 sa = vma->vm_start;
10db10d1
FT		 1209 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1210 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1211 len = vma->vm_end - sa;
10db10d1 1212 len = (len < length) ? len : length;
d6b10348 1213 if (offset < len) {
10db10d1
FT		 1214 struct page *page = nth_page(rsv_schp->pages[k],
1215 offset >> PAGE_SHIFT);
d6b10348 1216 get_page(page); /* increment page count */
a13ff0bb
NP		 1217 vmf->page = page;
1218 return 0; /* success */
1da177e4 1219 }
d6b10348
MC		 1220 sa += len;
1221 offset -= len;
1da177e4 1222 }
d6b10348 1223
a13ff0bb 1224 return VM_FAULT_SIGBUS;
1da177e4
LT		 1225}
1226
f0f37e2f 1227static const struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1228 .fault = sg_vma_fault,
1da177e4
LT		 1229};
1230
1231static int
1232sg_mmap(struct file *filp, struct vm_area_struct *vma)
1233{
1234 Sg_fd *sfp;
d6b10348 1235 unsigned long req_sz, len, sa;
1da177e4 1236 Sg_scatter_hold *rsv_schp;
10db10d1 1237 int k, length;
1da177e4
LT		 1238
1239 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1240 return -ENXIO;
cb59e840 1241 req_sz = vma->vm_end - vma->vm_start;
95e159d6
HR		 1242 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1243 "sg_mmap starting, vm_start=%p, len=%d\n",
1244 (void *) vma->vm_start, (int) req_sz));
1da177e4
LT		 1245 if (vma->vm_pgoff)
1246 return -EINVAL; /* want no offset */
1247 rsv_schp = &sfp->reserve;
1248 if (req_sz > rsv_schp->bufflen)
1249 return -ENOMEM; /* cannot map more than reserved buffer */
1250
d6b10348 1251 sa = vma->vm_start;
10db10d1
FT		 1252 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1253 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1254 len = vma->vm_end - sa;
10db10d1 1255 len = (len < length) ? len : length;
d6b10348 1256 sa += len;
1da177e4 1257 }
d6b10348 1258
f9aed0e2 1259 sfp->mmap_called = 1;
461c7fa1 1260 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1da177e4
LT		 1261 vma->vm_private_data = sfp;
1262 vma->vm_ops = &sg_mmap_vm_ops;
1263 return 0;
1264}
1265
cc833acb
DG		 1266static void
1267sg_rq_end_io_usercontext(struct work_struct *work)
c96952ed
FT		 1268{
1269 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1270 struct sg_fd *sfp = srp->parentfp;
1271
1272 sg_finish_rem_req(srp);
1273 kref_put(&sfp->f_ref, sg_remove_sfp);
1274}
1275
a91a3a20
FT		 1276/*
1277 * This function is a "bottom half" handler that is called by the mid
1278 * level when a command is completed (or has failed).
1279 */
cc833acb
DG		 1280static void
1281sg_rq_end_io(struct request *rq, int uptodate)
1da177e4 1282{
a91a3a20 1283 struct sg_request *srp = rq->end_io_data;
c6517b79 1284 Sg_device *sdp;
1da177e4 1285 Sg_fd *sfp;
1da177e4 1286 unsigned long iflags;
cb59e840 1287 unsigned int ms;
a91a3a20 1288 char *sense;
c6517b79 1289 int result, resid, done = 1;
1da177e4 1290
c6517b79 1291 if (WARN_ON(srp->done != 0))
1da177e4 1292 return;
c6517b79 1293
1da177e4 1294 sfp = srp->parentfp;
c6517b79 1295 if (WARN_ON(sfp == NULL))
1da177e4 1296 return;
c6517b79
TB		 1297
1298 sdp = sfp->parentdp;
cc833acb
DG		 1299 if (unlikely(atomic_read(&sdp->detaching)))
1300 pr_info("%s: device detaching\n", __func__);
1da177e4 1301
a91a3a20
FT		 1302 sense = rq->sense;
1303 result = rq->errors;
c3a4d78c 1304 resid = rq->resid_len;
1da177e4 1305
95e159d6
HR		 1306 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1307 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1308 srp->header.pack_id, result));
d6b10348 1309 srp->header.resid = resid;
cb59e840
DG		 1310 ms = jiffies_to_msecs(jiffies);
1311 srp->header.duration = (ms > srp->header.duration) ?
1312 (ms - srp->header.duration) : 0;
d6b10348 1313 if (0 != result) {
1da177e4
LT		 1314 struct scsi_sense_hdr sshdr;
1315
d6b10348
MC		 1316 srp->header.status = 0xff & result;
1317 srp->header.masked_status = status_byte(result);
1318 srp->header.msg_status = msg_byte(result);
1319 srp->header.host_status = host_byte(result);
1320 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1321 if ((sdp->sgdebug > 0) &&
1322 ((CHECK_CONDITION == srp->header.masked_status) ||
1323 (COMMAND_TERMINATED == srp->header.masked_status)))
d811b848 1324 __scsi_print_sense(sdp->device, __func__, sense,
d6b10348 1325 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1326
1327 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1328 if (driver_byte(result) != 0
1329 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1330 && !scsi_sense_is_deferred(&sshdr)
1331 && sshdr.sense_key == UNIT_ATTENTION
1332 && sdp->device->removable) {
1333 /* Detected possible disc change. Set the bit - this */
1334 /* may be used if there are filesystems using this device */
1335 sdp->device->changed = 1;
1336 }
1337 }
1338 /* Rely on write phase to clean out srp status values, so no "else" */
1339
7568615c
TB		 1340 /*
1341 * Free the request as soon as it is complete so that its resources
1342 * can be reused without waiting for userspace to read() the
1343 * result. But keep the associated bio (if any) around until
1344 * blk_rq_unmap_user() can be called from user context.
1345 */
1346 srp->rq = NULL;
1347 if (rq->cmd != rq->__cmd)
1348 kfree(rq->cmd);
1349 __blk_put_request(rq->q, rq);
1350
c6517b79
TB		 1351 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1352 if (unlikely(srp->orphan)) {
1da177e4
LT		 1353 if (sfp->keep_orphan)
1354 srp->sg_io_owned = 0;
c6517b79
TB		 1355 else
1356 done = 0;
1da177e4 1357 }
c6517b79
TB		 1358 srp->done = done;
1359 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1360
1361 if (likely(done)) {
1362 /* Now wake up any sg_read() that is waiting for this
1363 * packet.
1364 */
1da177e4 1365 wake_up_interruptible(&sfp->read_wait);
c6517b79 1366 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
c96952ed 1367 kref_put(&sfp->f_ref, sg_remove_sfp);
015640ed
FT		 1368 } else {
1369 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1370 schedule_work(&srp->ew.work);
1371 }
1da177e4
LT		 1372}
1373
828c0950 1374static const struct file_operations sg_fops = {
1da177e4
LT		 1375 .owner = THIS_MODULE,
1376 .read = sg_read,
1377 .write = sg_write,
1378 .poll = sg_poll,
37b9d1e0 1379 .unlocked_ioctl = sg_ioctl,
1da177e4
LT		 1380#ifdef CONFIG_COMPAT
1381 .compat_ioctl = sg_compat_ioctl,
1382#endif
1383 .open = sg_open,
1384 .mmap = sg_mmap,
1385 .release = sg_release,
1386 .fasync = sg_fasync,
6038f373 1387 .llseek = no_llseek,
1da177e4
LT		 1388};
1389
d253878b 1390static struct class *sg_sysfs_class;
1da177e4
LT		 1391
1392static int sg_sysfs_valid = 0;
1393
cc833acb
DG		 1394static Sg_device *
1395sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1396{
d6b10348 1397 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1398 Sg_device *sdp;
1399 unsigned long iflags;
7c07d613
JB		 1400 int error;
1401 u32 k;
1da177e4 1402
24669f75 1403 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4 1404 if (!sdp) {
cc833acb
DG		 1405 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1406 "failure\n", __func__);
7c07d613
JB		 1407 return ERR_PTR(-ENOMEM);
1408 }
c6517b79 1409
b98c52b5 1410 idr_preload(GFP_KERNEL);
7c07d613 1411 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4 1412
b98c52b5
TH		 1413 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1414 if (error < 0) {
1415 if (error == -ENOSPC) {
1416 sdev_printk(KERN_WARNING, scsidp,
1417 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1418 scsidp->type, SG_MAX_DEVS - 1);
1419 error = -ENODEV;
1420 } else {
cc833acb
DG		 1421 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1422 "allocation Sg_device failure: %d\n",
1423 __func__, error);
b98c52b5
TH		 1424 }
1425 goto out_unlock;
1da177e4 1426 }
b98c52b5 1427 k = error;
1da177e4 1428
95e159d6
HR		 1429 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1430 "sg_alloc: dev=%d \n", k));
1da177e4
LT		 1431 sprintf(disk->disk_name, "sg%d", k);
1432 disk->first_minor = k;
1433 sdp->disk = disk;
1434 sdp->device = scsidp;
cc833acb 1435 mutex_init(&sdp->open_rel_lock);
3442f802 1436 INIT_LIST_HEAD(&sdp->sfds);
cc833acb
DG		 1437 init_waitqueue_head(&sdp->open_wait);
1438 atomic_set(&sdp->detaching, 0);
1439 rwlock_init(&sdp->sfd_lock);
8a78362c 1440 sdp->sg_tablesize = queue_max_segments(q);
7c07d613 1441 sdp->index = k;
c6517b79 1442 kref_init(&sdp->d_ref);
b98c52b5 1443 error = 0;
c6517b79 1444
b98c52b5 1445out_unlock:
c6517b79 1446 write_unlock_irqrestore(&sg_index_lock, iflags);
b98c52b5 1447 idr_preload_end();
1da177e4 1448
7c07d613 1449 if (error) {
1da177e4 1450 kfree(sdp);
7c07d613
JB		 1451 return ERR_PTR(error);
1452 }
1453 return sdp;
1da177e4
LT		 1454}
1455
1456static int
cc833acb 1457sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1458{
ee959b00 1459 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1460 struct gendisk *disk;
1461 Sg_device *sdp = NULL;
1462 struct cdev * cdev = NULL;
7c07d613 1463 int error;
454e8957 1464 unsigned long iflags;
1da177e4
LT		 1465
1466 disk = alloc_disk(1);
1467 if (!disk) {
cc833acb 1468 pr_warn("%s: alloc_disk failed\n", __func__);
1da177e4
LT		 1469 return -ENOMEM;
1470 }
1471 disk->major = SCSI_GENERIC_MAJOR;
1472
1473 error = -ENOMEM;
1474 cdev = cdev_alloc();
1475 if (!cdev) {
cc833acb 1476 pr_warn("%s: cdev_alloc failed\n", __func__);
1da177e4
LT		 1477 goto out;
1478 }
1479 cdev->owner = THIS_MODULE;
1480 cdev->ops = &sg_fops;
1481
7c07d613
JB		 1482 sdp = sg_alloc(disk, scsidp);
1483 if (IS_ERR(sdp)) {
cc833acb 1484 pr_warn("%s: sg_alloc failed\n", __func__);
7c07d613 1485 error = PTR_ERR(sdp);
1da177e4
LT		 1486 goto out;
1487 }
1da177e4 1488
7c07d613 1489 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1490 if (error)
454e8957 1491 goto cdev_add_err;
5e3c34c1 1492
1da177e4
LT		 1493 sdp->cdev = cdev;
1494 if (sg_sysfs_valid) {
ee959b00 1495 struct device *sg_class_member;
1da177e4 1496
d73a1a67
GKH		 1497 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1498 MKDEV(SCSI_GENERIC_MAJOR,
1499 sdp->index),
1500 sdp, "%s", disk->disk_name);
d07e0361 1501 if (IS_ERR(sg_class_member)) {
cc833acb 1502 pr_err("%s: device_create failed\n", __func__);
d07e0361
FT		 1503 error = PTR_ERR(sg_class_member);
1504 goto cdev_add_err;
1505 }
d07e0361 1506 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1507 &sg_class_member->kobj, "generic");
1508 if (error)
cc833acb
DG		 1509 pr_err("%s: unable to make symlink 'generic' back "
1510 "to sg%d\n", __func__, sdp->index);
1da177e4 1511 } else
cc833acb 1512 pr_warn("%s: sg_sys Invalid\n", __func__);
1da177e4 1513
cc833acb
DG		 1514 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1515 "type %d\n", sdp->index, scsidp->type);
1da177e4 1516
ee959b00 1517 dev_set_drvdata(cl_dev, sdp);
a24484f2 1518
1da177e4
LT		 1519 return 0;
1520
454e8957 1521cdev_add_err:
7c07d613
JB		 1522 write_lock_irqsave(&sg_index_lock, iflags);
1523 idr_remove(&sg_index_idr, sdp->index);
1524 write_unlock_irqrestore(&sg_index_lock, iflags);
1525 kfree(sdp);
454e8957 1526
1da177e4
LT		 1527out:
1528 put_disk(disk);
1529 if (cdev)
1530 cdev_del(cdev);
1531 return error;
1532}
1533
cc833acb
DG		 1534static void
1535sg_device_destroy(struct kref *kref)
c6517b79
TB		 1536{
1537 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1538 unsigned long flags;
1539
1540 /* CAUTION! Note that the device can still be found via idr_find()
1541 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1542 * any other cleanup.
1543 */
1544
1545 write_lock_irqsave(&sg_index_lock, flags);
1546 idr_remove(&sg_index_idr, sdp->index);
1547 write_unlock_irqrestore(&sg_index_lock, flags);
1548
1549 SCSI_LOG_TIMEOUT(3,
95e159d6 1550 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
c6517b79
TB		 1551
1552 put_disk(sdp->disk);
1553 kfree(sdp);
1554}
1555
cc833acb
DG		 1556static void
1557sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1558{
ee959b00
TJ		 1559 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1560 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1561 unsigned long iflags;
1562 Sg_fd *sfp;
cc833acb 1563 int val;
1da177e4 1564
cc833acb 1565 if (!sdp)
1da177e4 1566 return;
cc833acb
DG		 1567 /* want sdp->detaching non-zero as soon as possible */
1568 val = atomic_inc_return(&sdp->detaching);
1569 if (val > 1)
1570 return; /* only want to do following once per device */
7c07d613 1571
95e159d6
HR		 1572 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1573 "%s\n", __func__));
c6517b79 1574
cc833acb 1575 read_lock_irqsave(&sdp->sfd_lock, iflags);
3442f802 1576 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
cc833acb 1577 wake_up_interruptible_all(&sfp->read_wait);
c6517b79 1578 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
7c07d613 1579 }
cc833acb
DG		 1580 wake_up_interruptible_all(&sdp->open_wait);
1581 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
7c07d613
JB		 1582
1583 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1584 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1585 cdev_del(sdp->cdev);
1586 sdp->cdev = NULL;
1da177e4 1587
cc833acb 1588 kref_put(&sdp->d_ref, sg_device_destroy);
1da177e4
LT		 1589}
1590
6460e75a
DG		 1591module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1592module_param_named(def_reserved_size, def_reserved_size, int,
1593 S_IRUGO | S_IWUSR);
1da177e4
LT		 1594module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1595
1596MODULE_AUTHOR("Douglas Gilbert");
1597MODULE_DESCRIPTION("SCSI generic (sg) driver");
1598MODULE_LICENSE("GPL");
1599MODULE_VERSION(SG_VERSION_STR);
f018fa55 1600MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1601
6460e75a
DG		 1602MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1603 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1604MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1605MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1606
1607static int __init
1608init_sg(void)
1609{
1610 int rc;
1611
6460e75a
DG		 1612 if (scatter_elem_sz < PAGE_SIZE) {
1613 scatter_elem_sz = PAGE_SIZE;
1614 scatter_elem_sz_prev = scatter_elem_sz;
1615 }
1da177e4
LT		 1616 if (def_reserved_size >= 0)
1617 sg_big_buff = def_reserved_size;
6460e75a
DG		 1618 else
1619 def_reserved_size = sg_big_buff;
1da177e4
LT		 1620
1621 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1622 SG_MAX_DEVS, "sg");
1623 if (rc)
1624 return rc;
d253878b 1625 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1626 if ( IS_ERR(sg_sysfs_class) ) {
1627 rc = PTR_ERR(sg_sysfs_class);
1628 goto err_out;
1629 }
1630 sg_sysfs_valid = 1;
1631 rc = scsi_register_interface(&sg_interface);
1632 if (0 == rc) {
1633#ifdef CONFIG_SCSI_PROC_FS
1634 sg_proc_init();
1635#endif /* CONFIG_SCSI_PROC_FS */
1636 return 0;
1637 }
d253878b 1638 class_destroy(sg_sysfs_class);
1da177e4
LT		 1639err_out:
1640 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1641 return rc;
1642}
1643
1644static void __exit
1645exit_sg(void)
1646{
1647#ifdef CONFIG_SCSI_PROC_FS
1648 sg_proc_cleanup();
1649#endif /* CONFIG_SCSI_PROC_FS */
1650 scsi_unregister_interface(&sg_interface);
d253878b 1651 class_destroy(sg_sysfs_class);
1da177e4
LT		 1652 sg_sysfs_valid = 0;
1653 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1654 SG_MAX_DEVS);
7c07d613 1655 idr_destroy(&sg_index_idr);
1da177e4
LT		 1656}
1657
cc833acb
DG		 1658static int
1659sg_start_req(Sg_request *srp, unsigned char *cmd)
10865dfa 1660{
626710c9 1661 int res;
10865dfa 1662 struct request *rq;
44c7b0ea
FT		 1663 Sg_fd *sfp = srp->parentfp;
1664 sg_io_hdr_t *hp = &srp->header;
1665 int dxfer_len = (int) hp->dxfer_len;
1666 int dxfer_dir = hp->dxfer_direction;
626710c9 1667 unsigned int iov_count = hp->iovec_count;
44c7b0ea
FT		 1668 Sg_scatter_hold *req_schp = &srp->data;
1669 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1670 struct request_queue *q = sfp->parentdp->device->request_queue;
626710c9 1671 struct rq_map_data *md, map_data;
10865dfa 1672 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
65c26a0f 1673 unsigned char *long_cmdp = NULL;
10865dfa 1674
95e159d6
HR		 1675 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1676 "sg_start_req: dxfer_len=%d\n",
1677 dxfer_len));
44c7b0ea 1678
65c26a0f
DG		 1679 if (hp->cmd_len > BLK_MAX_CDB) {
1680 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1681 if (!long_cmdp)
1682 return -ENOMEM;
1683 }
1684
7772855a
TB		 1685 /*
1686 * NOTE
1687 *
1688 * With scsi-mq enabled, there are a fixed number of preallocated
1689 * requests equal in number to shost->can_queue. If all of the
1690 * preallocated requests are already in use, then using GFP_ATOMIC with
1691 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1692 * will cause blk_get_request() to sleep until an active command
1693 * completes, freeing up a request. Neither option is ideal, but
1694 * GFP_KERNEL is the better choice to prevent userspace from getting an
1695 * unexpected EWOULDBLOCK.
1696 *
1697 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1698 * does not sleep except under memory pressure.
1699 */
1700 rq = blk_get_request(q, rw, GFP_KERNEL);
a492f075 1701 if (IS_ERR(rq)) {
65c26a0f 1702 kfree(long_cmdp);
a492f075 1703 return PTR_ERR(rq);
65c26a0f 1704 }
10865dfa 1705
f27b087b 1706 blk_rq_set_block_pc(rq);
65c26a0f
DG		 1707
1708 if (hp->cmd_len > BLK_MAX_CDB)
1709 rq->cmd = long_cmdp;
10865dfa 1710 memcpy(rq->cmd, cmd, hp->cmd_len);
10865dfa 1711 rq->cmd_len = hp->cmd_len;
10865dfa
FT		 1712
1713 srp->rq = rq;
1714 rq->end_io_data = srp;
1715 rq->sense = srp->sense_b;
1716 rq->retries = SG_DEFAULT_RETRIES;
1717
1da177e4 1718 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1719 return 0;
10865dfa 1720
626710c9
FT		 1721 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1722 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1723 !sfp->parentdp->device->host->unchecked_isa_dma &&
2610a254 1724 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
626710c9
FT		 1725 md = NULL;
1726 else
1727 md = &map_data;
1728
1729 if (md) {
1730 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1731 sg_link_reserve(sfp, srp, dxfer_len);
1732 else {
1733 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1734 if (res)
1735 return res;
1736 }
7e56cb0f 1737
626710c9
FT		 1738 md->pages = req_schp->pages;
1739 md->page_order = req_schp->page_order;
1740 md->nr_entries = req_schp->k_use_sg;
56c451f4 1741 md->offset = 0;
97ae77a1 1742 md->null_mapped = hp->dxferp ? 0 : 1;
ecb554a8
FT		 1743 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1744 md->from_user = 1;
1745 else
1746 md->from_user = 0;
626710c9
FT		 1747 }
1748
0fdf96b6 1749 if (iov_count) {
fdc81f45 1750 struct iovec *iov = NULL;
26e49cfc 1751 struct iov_iter i;
0fdf96b6 1752
fdc81f45
AV		 1753 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
1754 if (res < 0)
1755 return res;
0fdf96b6 1756
fdc81f45 1757 iov_iter_truncate(&i, hp->dxfer_len);
137d01df
AV		 1758 if (!iov_iter_count(&i)) {
1759 kfree(iov);
1760 return -EINVAL;
1761 }
0fdf96b6 1762
26e49cfc 1763 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
0fdf96b6
FT		 1764 kfree(iov);
1765 } else
626710c9
FT		 1766 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1767 hp->dxfer_len, GFP_ATOMIC);
10db10d1
FT		 1768
1769 if (!res) {
626710c9 1770 srp->bio = rq->bio;
10db10d1 1771
626710c9
FT		 1772 if (!md) {
1773 req_schp->dio_in_use = 1;
1774 hp->info |= SG_INFO_DIRECT_IO;
1775 }
1776 }
10db10d1 1777 return res;
1da177e4
LT		 1778}
1779
cc833acb
DG		 1780static int
1781sg_finish_rem_req(Sg_request *srp)
1da177e4 1782{
e7ee4cc0
FT		 1783 int ret = 0;
1784
1da177e4
LT		 1785 Sg_fd *sfp = srp->parentfp;
1786 Sg_scatter_hold *req_schp = &srp->data;
1787
95e159d6
HR		 1788 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1789 "sg_finish_rem_req: res_used=%d\n",
1790 (int) srp->res_used));
7568615c
TB		 1791 if (srp->bio)
1792 ret = blk_rq_unmap_user(srp->bio);
10db10d1 1793
7568615c 1794 if (srp->rq) {
65c26a0f
DG		 1795 if (srp->rq->cmd != srp->rq->__cmd)
1796 kfree(srp->rq->cmd);
10865dfa 1797 blk_put_request(srp->rq);
6e5a30cb 1798 }
10865dfa 1799
e27168f8
CS		 1800 if (srp->res_used)
1801 sg_unlink_reserve(sfp, srp);
1802 else
95e159d6 1803 sg_remove_scat(sfp, req_schp);
e27168f8 1804
1da177e4 1805 sg_remove_request(sfp, srp);
e7ee4cc0
FT		 1806
1807 return ret;
1da177e4
LT		 1808}
1809
1810static int
1811sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1812{
10db10d1 1813 int sg_bufflen = tablesize * sizeof(struct page *);
2d20eaf9 1814 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1815
10db10d1
FT		 1816 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1817 if (!schp->pages)
1da177e4 1818 return -ENOMEM;
1da177e4 1819 schp->sglist_len = sg_bufflen;
d6b10348 1820 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1821}
1822
1da177e4
LT		 1823static int
1824sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1825{
10db10d1 1826 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1827 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1828 int blk_size = buff_size, order;
1829 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4 1830
fb119935 1831 if (blk_size < 0)
1da177e4
LT		 1832 return -EFAULT;
1833 if (0 == blk_size)
1834 ++blk_size; /* don't know why */
b2ed6c69
FT		 1835 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1836 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
95e159d6
HR		 1837 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1838 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1839 buff_size, blk_size));
d6b10348
MC		 1840
1841 /* N.B. ret_sz carried into this block ... */
1842 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1843 if (mx_sc_elems < 0)
1844 return mx_sc_elems; /* most likely -ENOMEM */
1845
6460e75a
DG		 1846 num = scatter_elem_sz;
1847 if (unlikely(num != scatter_elem_sz_prev)) {
1848 if (num < PAGE_SIZE) {
1849 scatter_elem_sz = PAGE_SIZE;
1850 scatter_elem_sz_prev = PAGE_SIZE;
1851 } else
1852 scatter_elem_sz_prev = num;
1853 }
10db10d1
FT		 1854
1855 if (sfp->low_dma)
1856 gfp_mask |= GFP_DMA;
1857
1858 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1859 gfp_mask |= __GFP_ZERO;
1860
1861 order = get_order(num);
1862retry:
1863 ret_sz = 1 << (PAGE_SHIFT + order);
1864
1865 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1866 k++, rem_sz -= ret_sz) {
1867
6460e75a 1868 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1869 scatter_elem_sz_prev : rem_sz;
1870
1871 schp->pages[k] = alloc_pages(gfp_mask, order);
1872 if (!schp->pages[k])
1873 goto out;
d6b10348 1874
6460e75a
DG		 1875 if (num == scatter_elem_sz_prev) {
1876 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1877 scatter_elem_sz = ret_sz;
1878 scatter_elem_sz_prev = ret_sz;
1879 }
1880 }
d6b10348 1881
95e159d6
HR		 1882 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1883 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1884 k, num, ret_sz));
d6b10348
MC		 1885 } /* end of for loop */
1886
10db10d1 1887 schp->page_order = order;
d6b10348 1888 schp->k_use_sg = k;
95e159d6
HR		 1889 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1890 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1891 k, rem_sz));
d6b10348
MC		 1892
1893 schp->bufflen = blk_size;
1894 if (rem_sz > 0) /* must have failed */
1895 return -ENOMEM;
1da177e4 1896 return 0;
10db10d1
FT		 1897out:
1898 for (i = 0; i < k; i++)
e71044ee 1899 __free_pages(schp->pages[i], order);
10db10d1
FT		 1900
1901 if (--order >= 0)
1902 goto retry;
1903
1904 return -ENOMEM;
1da177e4
LT		 1905}
1906
1da177e4 1907static void
95e159d6 1908sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1da177e4 1909{
95e159d6
HR		 1910 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1911 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1912 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1913 if (!schp->dio_in_use) {
1da177e4
LT		 1914 int k;
1915
10db10d1 1916 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
95e159d6
HR		 1917 SCSI_LOG_TIMEOUT(5,
1918 sg_printk(KERN_INFO, sfp->parentdp,
1919 "sg_remove_scat: k=%d, pg=0x%p\n",
1920 k, schp->pages[k]));
10db10d1 1921 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1922 }
6e5a30cb 1923
10db10d1 1924 kfree(schp->pages);
1da177e4 1925 }
d6b10348 1926 }
1da177e4
LT		 1927 memset(schp, 0, sizeof (*schp));
1928}
1929
1da177e4
LT		 1930static int
1931sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1932{
1933 Sg_scatter_hold *schp = &srp->data;
d6b10348 1934 int k, num;
1da177e4 1935
95e159d6
HR		 1936 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1937 "sg_read_oxfer: num_read_xfer=%d\n",
1938 num_read_xfer));
1da177e4
LT		 1939 if ((!outp) || (num_read_xfer <= 0))
1940 return 0;
d6b10348 1941
10db10d1
FT		 1942 num = 1 << (PAGE_SHIFT + schp->page_order);
1943 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1944 if (num > num_read_xfer) {
10db10d1 1945 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1946 num_read_xfer))
1947 return -EFAULT;
1948 break;
1949 } else {
10db10d1 1950 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1951 num))
1952 return -EFAULT;
1953 num_read_xfer -= num;
1954 if (num_read_xfer <= 0)
1da177e4 1955 break;
d6b10348 1956 outp += num;
1da177e4 1957 }
1da177e4 1958 }
d6b10348 1959
1da177e4
LT		 1960 return 0;
1961}
1962
1963static void
1964sg_build_reserve(Sg_fd * sfp, int req_size)
1965{
1966 Sg_scatter_hold *schp = &sfp->reserve;
1967
95e159d6
HR		 1968 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1969 "sg_build_reserve: req_size=%d\n", req_size));
1da177e4
LT		 1970 do {
1971 if (req_size < PAGE_SIZE)
1972 req_size = PAGE_SIZE;
1973 if (0 == sg_build_indirect(schp, sfp, req_size))
1974 return;
1975 else
95e159d6 1976 sg_remove_scat(sfp, schp);
1da177e4
LT		 1977 req_size >>= 1; /* divide by 2 */
1978 } while (req_size > (PAGE_SIZE / 2));
1979}
1980
1981static void
1982sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1983{
1984 Sg_scatter_hold *req_schp = &srp->data;
1985 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 1986 int k, num, rem;
1da177e4
LT		 1987
1988 srp->res_used = 1;
95e159d6
HR		 1989 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1990 "sg_link_reserve: size=%d\n", size));
eca7be5e 1991 rem = size;
d6b10348 1992
10db10d1
FT		 1993 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1994 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 1995 if (rem <= num) {
d6b10348
MC		 1996 req_schp->k_use_sg = k + 1;
1997 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 1998 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 1999
2000 req_schp->bufflen = size;
10db10d1 2001 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 2002 break;
2003 } else
2004 rem -= num;
1da177e4 2005 }
d6b10348
MC		 2006
2007 if (k >= rsv_schp->k_use_sg)
95e159d6
HR		 2008 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2009 "sg_link_reserve: BAD size\n"));
1da177e4
LT		 2010}
2011
2012static void
2013sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2014{
2015 Sg_scatter_hold *req_schp = &srp->data;
1da177e4 2016
95e159d6
HR		 2017 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2018 "sg_unlink_reserve: req->k_use_sg=%d\n",
2019 (int) req_schp->k_use_sg));
1da177e4
LT		 2020 req_schp->k_use_sg = 0;
2021 req_schp->bufflen = 0;
10db10d1
FT		 2022 req_schp->pages = NULL;
2023 req_schp->page_order = 0;
1da177e4
LT		 2024 req_schp->sglist_len = 0;
2025 sfp->save_scat_len = 0;
2026 srp->res_used = 0;
2027}
2028
2029static Sg_request *
2030sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2031{
2032 Sg_request *resp;
2033 unsigned long iflags;
2034
2035 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2036 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2037 /* look for requests that are ready + not SG_IO owned */
2038 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2039 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2040 resp->done = 2; /* guard against other readers */
2041 break;
2042 }
2043 }
2044 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2045 return resp;
2046}
2047
1da177e4
LT		 2048/* always adds to end of list */
2049static Sg_request *
2050sg_add_request(Sg_fd * sfp)
2051{
2052 int k;
2053 unsigned long iflags;
2054 Sg_request *resp;
2055 Sg_request *rp = sfp->req_arr;
2056
2057 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2058 resp = sfp->headrp;
2059 if (!resp) {
2060 memset(rp, 0, sizeof (Sg_request));
2061 rp->parentfp = sfp;
2062 resp = rp;
2063 sfp->headrp = resp;
2064 } else {
2065 if (0 == sfp->cmd_q)
2066 resp = NULL; /* command queuing disallowed */
2067 else {
2068 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2069 if (!rp->parentfp)
2070 break;
2071 }
2072 if (k < SG_MAX_QUEUE) {
2073 memset(rp, 0, sizeof (Sg_request));
2074 rp->parentfp = sfp;
2075 while (resp->nextrp)
2076 resp = resp->nextrp;
2077 resp->nextrp = rp;
2078 resp = rp;
2079 } else
2080 resp = NULL;
2081 }
2082 }
2083 if (resp) {
2084 resp->nextrp = NULL;
cb59e840 2085 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2086 }
2087 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2088 return resp;
2089}
2090
2091/* Return of 1 for found; 0 for not found */
2092static int
2093sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2094{
2095 Sg_request *prev_rp;
2096 Sg_request *rp;
2097 unsigned long iflags;
2098 int res = 0;
2099
2100 if ((!sfp) || (!srp) || (!sfp->headrp))
2101 return res;
2102 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2103 prev_rp = sfp->headrp;
2104 if (srp == prev_rp) {
2105 sfp->headrp = prev_rp->nextrp;
2106 prev_rp->parentfp = NULL;
2107 res = 1;
2108 } else {
2109 while ((rp = prev_rp->nextrp)) {
2110 if (srp == rp) {
2111 prev_rp->nextrp = rp->nextrp;
2112 rp->parentfp = NULL;
2113 res = 1;
2114 break;
2115 }
2116 prev_rp = rp;
2117 }
2118 }
2119 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2120 return res;
2121}
2122
1da177e4 2123static Sg_fd *
95e159d6 2124sg_add_sfp(Sg_device * sdp)
1da177e4
LT		 2125{
2126 Sg_fd *sfp;
2127 unsigned long iflags;
44ec9542 2128 int bufflen;
1da177e4 2129
d6b10348 2130 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4 2131 if (!sfp)
cc833acb 2132 return ERR_PTR(-ENOMEM);
d6b10348 2133
1da177e4
LT		 2134 init_waitqueue_head(&sfp->read_wait);
2135 rwlock_init(&sfp->rq_list_lock);
2136
c6517b79 2137 kref_init(&sfp->f_ref);
1da177e4
LT		 2138 sfp->timeout = SG_DEFAULT_TIMEOUT;
2139 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2140 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2141 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2142 sdp->device->host->unchecked_isa_dma : 1;
2143 sfp->cmd_q = SG_DEF_COMMAND_Q;
2144 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2145 sfp->parentdp = sdp;
cc833acb
DG		 2146 write_lock_irqsave(&sdp->sfd_lock, iflags);
2147 if (atomic_read(&sdp->detaching)) {
2148 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2149 return ERR_PTR(-ENODEV);
2150 }
3442f802 2151 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
cc833acb 2152 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
95e159d6
HR		 2153 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2154 "sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2155 if (unlikely(sg_big_buff != def_reserved_size))
2156 sg_big_buff = def_reserved_size;
2157
44ec9542 2158 bufflen = min_t(int, sg_big_buff,
46f69e6a 2159 max_sectors_bytes(sdp->device->request_queue));
44ec9542 2160 sg_build_reserve(sfp, bufflen);
95e159d6
HR		 2161 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2162 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2163 sfp->reserve.bufflen,
2164 sfp->reserve.k_use_sg));
c6517b79
TB		 2165
2166 kref_get(&sdp->d_ref);
2167 __module_get(THIS_MODULE);
1da177e4
LT		 2168 return sfp;
2169}
2170
cc833acb
DG		 2171static void
2172sg_remove_sfp_usercontext(struct work_struct *work)
1da177e4 2173{
c6517b79
TB		 2174 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2175 struct sg_device *sdp = sfp->parentdp;
2176
2177 /* Cleanup any responses which were never read(). */
2178 while (sfp->headrp)
2179 sg_finish_rem_req(sfp->headrp);
1da177e4 2180
1da177e4 2181 if (sfp->reserve.bufflen > 0) {
95e159d6
HR		 2182 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2183 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
c6517b79
TB		 2184 (int) sfp->reserve.bufflen,
2185 (int) sfp->reserve.k_use_sg));
95e159d6 2186 sg_remove_scat(sfp, &sfp->reserve);
1da177e4 2187 }
c6517b79 2188
95e159d6
HR		 2189 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2190 "sg_remove_sfp: sfp=0x%p\n", sfp));
d6b10348 2191 kfree(sfp);
c6517b79
TB		 2192
2193 scsi_device_put(sdp->device);
cc833acb 2194 kref_put(&sdp->d_ref, sg_device_destroy);
c6517b79 2195 module_put(THIS_MODULE);
1da177e4
LT		 2196}
2197
cc833acb
DG		 2198static void
2199sg_remove_sfp(struct kref *kref)
1da177e4 2200{
c6517b79 2201 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
065b4a2f 2202 struct sg_device *sdp = sfp->parentdp;
c6517b79 2203 unsigned long iflags;
1da177e4 2204
cc833acb 2205 write_lock_irqsave(&sdp->sfd_lock, iflags);
3442f802 2206 list_del(&sfp->sfd_siblings);
cc833acb 2207 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
1da177e4 2208
015640ed
FT		 2209 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2210 schedule_work(&sfp->ew.work);
1da177e4
LT		 2211}
2212
2213static int
2214sg_res_in_use(Sg_fd * sfp)
2215{
2216 const Sg_request *srp;
2217 unsigned long iflags;
2218
2219 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2220 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2221 if (srp->res_used)
2222 break;
2223 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2224 return srp ? 1 : 0;
2225}
2226
1da177e4 2227#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2228static int
2229sg_idr_max_id(int id, void *p, void *data)
2230{
2231 int *k = data;
2232
2233 if (*k < id)
2234 *k = id;
2235
2236 return 0;
2237}
2238
1da177e4
LT		 2239static int
2240sg_last_dev(void)
2241{
53474c04 2242 int k = -1;
1da177e4
LT		 2243 unsigned long iflags;
2244
7c07d613
JB		 2245 read_lock_irqsave(&sg_index_lock, iflags);
2246 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2247 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2248 return k + 1; /* origin 1 */
2249}
2250#endif
2251
c6517b79
TB		 2252/* must be called with sg_index_lock held */
2253static Sg_device *sg_lookup_dev(int dev)
1da177e4 2254{
c6517b79
TB		 2255 return idr_find(&sg_index_idr, dev);
2256}
1da177e4 2257
cc833acb
DG		 2258static Sg_device *
2259sg_get_dev(int dev)
c6517b79
TB		 2260{
2261 struct sg_device *sdp;
2262 unsigned long flags;
2263
2264 read_lock_irqsave(&sg_index_lock, flags);
2265 sdp = sg_lookup_dev(dev);
2266 if (!sdp)
2267 sdp = ERR_PTR(-ENXIO);
cc833acb
DG		 2268 else if (atomic_read(&sdp->detaching)) {
2269 /* If sdp->detaching, then the refcount may already be 0, in
c6517b79
TB		 2270 * which case it would be a bug to do kref_get().
2271 */
2272 sdp = ERR_PTR(-ENODEV);
2273 } else
2274 kref_get(&sdp->d_ref);
2275 read_unlock_irqrestore(&sg_index_lock, flags);
7c07d613 2276
1da177e4
LT		 2277 return sdp;
2278}
2279
2280#ifdef CONFIG_SCSI_PROC_FS
2281
2282static struct proc_dir_entry *sg_proc_sgp = NULL;
2283
2284static char sg_proc_sg_dirname[] = "scsi/sg";
2285
2286static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2287
2288static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2289static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2290 size_t count, loff_t *off);
828c0950
AD		 2291static const struct file_operations adio_fops = {
2292 .owner = THIS_MODULE,
1da177e4 2293 .open = sg_proc_single_open_adio,
828c0950
AD		 2294 .read = seq_read,
2295 .llseek = seq_lseek,
1da177e4
LT		 2296 .write = sg_proc_write_adio,
2297 .release = single_release,
2298};
2299
2300static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2301static ssize_t sg_proc_write_dressz(struct file *filp,
2302 const char __user *buffer, size_t count, loff_t *off);
828c0950
AD		 2303static const struct file_operations dressz_fops = {
2304 .owner = THIS_MODULE,
1da177e4 2305 .open = sg_proc_single_open_dressz,
828c0950
AD		 2306 .read = seq_read,
2307 .llseek = seq_lseek,
1da177e4
LT		 2308 .write = sg_proc_write_dressz,
2309 .release = single_release,
2310};
2311
2312static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2313static int sg_proc_single_open_version(struct inode *inode, struct file *file);
828c0950
AD		 2314static const struct file_operations version_fops = {
2315 .owner = THIS_MODULE,
1da177e4 2316 .open = sg_proc_single_open_version,
828c0950
AD		 2317 .read = seq_read,
2318 .llseek = seq_lseek,
1da177e4
LT		 2319 .release = single_release,
2320};
2321
2322static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2323static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
828c0950
AD		 2324static const struct file_operations devhdr_fops = {
2325 .owner = THIS_MODULE,
1da177e4 2326 .open = sg_proc_single_open_devhdr,
828c0950
AD		 2327 .read = seq_read,
2328 .llseek = seq_lseek,
1da177e4
LT		 2329 .release = single_release,
2330};
2331
2332static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2333static int sg_proc_open_dev(struct inode *inode, struct file *file);
2334static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2335static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2336static void dev_seq_stop(struct seq_file *s, void *v);
828c0950
AD		 2337static const struct file_operations dev_fops = {
2338 .owner = THIS_MODULE,
1da177e4 2339 .open = sg_proc_open_dev,
828c0950
AD		 2340 .read = seq_read,
2341 .llseek = seq_lseek,
1da177e4
LT		 2342 .release = seq_release,
2343};
88e9d34c 2344static const struct seq_operations dev_seq_ops = {
1da177e4
LT		 2345 .start = dev_seq_start,
2346 .next = dev_seq_next,
2347 .stop = dev_seq_stop,
2348 .show = sg_proc_seq_show_dev,
2349};
2350
2351static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2352static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
828c0950
AD		 2353static const struct file_operations devstrs_fops = {
2354 .owner = THIS_MODULE,
1da177e4 2355 .open = sg_proc_open_devstrs,
828c0950
AD		 2356 .read = seq_read,
2357 .llseek = seq_lseek,
1da177e4
LT		 2358 .release = seq_release,
2359};
88e9d34c 2360static const struct seq_operations devstrs_seq_ops = {
1da177e4
LT		 2361 .start = dev_seq_start,
2362 .next = dev_seq_next,
2363 .stop = dev_seq_stop,
2364 .show = sg_proc_seq_show_devstrs,
2365};
2366
2367static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2368static int sg_proc_open_debug(struct inode *inode, struct file *file);
828c0950
AD		 2369static const struct file_operations debug_fops = {
2370 .owner = THIS_MODULE,
1da177e4 2371 .open = sg_proc_open_debug,
828c0950
AD		 2372 .read = seq_read,
2373 .llseek = seq_lseek,
1da177e4
LT		 2374 .release = seq_release,
2375};
88e9d34c 2376static const struct seq_operations debug_seq_ops = {
1da177e4
LT		 2377 .start = dev_seq_start,
2378 .next = dev_seq_next,
2379 .stop = dev_seq_stop,
2380 .show = sg_proc_seq_show_debug,
2381};
2382
2383
2384struct sg_proc_leaf {
2385 const char * name;
828c0950 2386 const struct file_operations * fops;
1da177e4
LT		 2387};
2388
18b8ba6c 2389static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
1da177e4
LT		 2390 {"allow_dio", &adio_fops},
2391 {"debug", &debug_fops},
2392 {"def_reserved_size", &dressz_fops},
2393 {"device_hdr", &devhdr_fops},
2394 {"devices", &dev_fops},
2395 {"device_strs", &devstrs_fops},
2396 {"version", &version_fops}
2397};
2398
2399static int
2400sg_proc_init(void)
2401{
6391a113 2402 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
d161a13f 2403 int k;
1da177e4 2404
66600221 2405 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2406 if (!sg_proc_sgp)
2407 return 1;
2408 for (k = 0; k < num_leaves; ++k) {
18b8ba6c 2409 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
d161a13f 2410 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f 2411 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2412 }
2413 return 0;
2414}
2415
2416static void
2417sg_proc_cleanup(void)
2418{
2419 int k;
6391a113 2420 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2421
2422 if (!sg_proc_sgp)
2423 return;
2424 for (k = 0; k < num_leaves; ++k)
2425 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2426 remove_proc_entry(sg_proc_sg_dirname, NULL);
2427}
2428
2429
2430static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2431{
2432 seq_printf(s, "%d\n", *((int *)s->private));
2433 return 0;
2434}
2435
2436static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2437{
2438 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2439}
2440
2441static ssize_t
2442sg_proc_write_adio(struct file *filp, const char __user *buffer,
2443 size_t count, loff_t *off)
2444{
7e95fffe
SB		 2445 int err;
2446 unsigned long num;
1da177e4
LT		 2447
2448 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2449 return -EACCES;
7e95fffe
SB		 2450 err = kstrtoul_from_user(buffer, count, 0, &num);
2451 if (err)
2452 return err;
2453 sg_allow_dio = num ? 1 : 0;
1da177e4
LT		 2454 return count;
2455}
2456
2457static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2458{
2459 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2460}
2461
2462static ssize_t
2463sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2464 size_t count, loff_t *off)
2465{
7e95fffe 2466 int err;
1da177e4 2467 unsigned long k = ULONG_MAX;
1da177e4
LT		 2468
2469 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2470 return -EACCES;
7e95fffe
SB		 2471
2472 err = kstrtoul_from_user(buffer, count, 0, &k);
2473 if (err)
2474 return err;
1da177e4
LT		 2475 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2476 sg_big_buff = k;
2477 return count;
2478 }
2479 return -ERANGE;
2480}
2481
2482static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2483{
2484 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2485 sg_version_date);
2486 return 0;
2487}
2488
2489static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2490{
2491 return single_open(file, sg_proc_seq_show_version, NULL);
2492}
2493
2494static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2495{
cc833acb 2496 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
1da177e4
LT		 2497 return 0;
2498}
2499
2500static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2501{
2502 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2503}
2504
2505struct sg_proc_deviter {
2506 loff_t index;
2507 size_t max;
2508};
2509
2510static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2511{
2512 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2513
729d70f5 2514 s->private = it;
1da177e4
LT		 2515 if (! it)
2516 return NULL;
729d70f5 2517
1da177e4
LT		 2518 it->index = *pos;
2519 it->max = sg_last_dev();
2520 if (it->index >= it->max)
729d70f5 2521 return NULL;
1da177e4 2522 return it;
1da177e4
LT		 2523}
2524
2525static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2526{
729d70f5 2527 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2528
2529 *pos = ++it->index;
2530 return (it->index < it->max) ? it : NULL;
2531}
2532
2533static void dev_seq_stop(struct seq_file *s, void *v)
2534{
729d70f5 2535 kfree(s->private);
1da177e4
LT		 2536}
2537
2538static int sg_proc_open_dev(struct inode *inode, struct file *file)
2539{
2540 return seq_open(file, &dev_seq_ops);
2541}
2542
2543static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2544{
2545 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2546 Sg_device *sdp;
2547 struct scsi_device *scsidp;
c6517b79 2548 unsigned long iflags;
1da177e4 2549
c6517b79
TB		 2550 read_lock_irqsave(&sg_index_lock, iflags);
2551 sdp = it ? sg_lookup_dev(it->index) : NULL;
cc833acb
DG		 2552 if ((NULL == sdp) || (NULL == sdp->device) ||
2553 (atomic_read(&sdp->detaching)))
2554 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2555 else {
2556 scsidp = sdp->device;
9cb78c16 2557 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
1da177e4
LT		 2558 scsidp->host->host_no, scsidp->channel,
2559 scsidp->id, scsidp->lun, (int) scsidp->type,
2560 1,
2561 (int) scsidp->queue_depth,
71e75c97 2562 (int) atomic_read(&scsidp->device_busy),
1da177e4 2563 (int) scsi_device_online(scsidp));
cc833acb 2564 }
c6517b79 2565 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2566 return 0;
2567}
2568
2569static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2570{
2571 return seq_open(file, &devstrs_seq_ops);
2572}
2573
2574static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2575{
2576 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2577 Sg_device *sdp;
2578 struct scsi_device *scsidp;
c6517b79 2579 unsigned long iflags;
1da177e4 2580
c6517b79
TB		 2581 read_lock_irqsave(&sg_index_lock, iflags);
2582 sdp = it ? sg_lookup_dev(it->index) : NULL;
cc833acb
DG		 2583 scsidp = sdp ? sdp->device : NULL;
2584 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
1da177e4
LT		 2585 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2586 scsidp->vendor, scsidp->model, scsidp->rev);
2587 else
cc833acb 2588 seq_puts(s, "<no active device>\n");
c6517b79 2589 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2590 return 0;
2591}
2592
c0d3b9c2 2593/* must be called while holding sg_index_lock */
1da177e4
LT		 2594static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2595{
2596 int k, m, new_interface, blen, usg;
2597 Sg_request *srp;
2598 Sg_fd *fp;
2599 const sg_io_hdr_t *hp;
2600 const char * cp;
cb59e840 2601 unsigned int ms;
1da177e4 2602
3442f802
FT		 2603 k = 0;
2604 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2605 k++;
c6517b79 2606 read_lock(&fp->rq_list_lock); /* irqs already disabled */
1da177e4 2607 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3442f802 2608 "(res)sgat=%d low_dma=%d\n", k,
1da177e4
LT		 2609 jiffies_to_msecs(fp->timeout),
2610 fp->reserve.bufflen,
2611 (int) fp->reserve.k_use_sg,
2612 (int) fp->low_dma);
ebaf466b 2613 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
1da177e4 2614 (int) fp->cmd_q, (int) fp->force_packid,
ebaf466b 2615 (int) fp->keep_orphan);
c6517b79
TB		 2616 for (m = 0, srp = fp->headrp;
2617 srp != NULL;
2618 ++m, srp = srp->nextrp) {
1da177e4
LT		 2619 hp = &srp->header;
2620 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2621 if (srp->res_used) {
2622 if (new_interface &&
2623 (SG_FLAG_MMAP_IO & hp->flags))
2624 cp = " mmap>> ";
2625 else
2626 cp = " rb>> ";
2627 } else {
2628 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2629 cp = " dio>> ";
2630 else
2631 cp = " ";
2632 }
cc833acb 2633 seq_puts(s, cp);
d6b10348
MC		 2634 blen = srp->data.bufflen;
2635 usg = srp->data.k_use_sg;
cc833acb
DG		 2636 seq_puts(s, srp->done ?
2637 ((1 == srp->done) ? "rcv:" : "fin:")
2638 : "act:");
1da177e4
LT		 2639 seq_printf(s, " id=%d blen=%d",
2640 srp->header.pack_id, blen);
2641 if (srp->done)
2642 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 2643 else {
2644 ms = jiffies_to_msecs(jiffies);
1da177e4 2645 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 2646 (new_interface ? hp->timeout :
2647 jiffies_to_msecs(fp->timeout)),
2648 (ms > hp->duration ? ms - hp->duration : 0));
2649 }
1da177e4
LT		 2650 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2651 (int) srp->data.cmd_opcode);
2652 }
2653 if (0 == m)
cc833acb 2654 seq_puts(s, " No requests active\n");
c6517b79 2655 read_unlock(&fp->rq_list_lock);
1da177e4
LT		 2656 }
2657}
2658
2659static int sg_proc_open_debug(struct inode *inode, struct file *file)
2660{
2661 return seq_open(file, &debug_seq_ops);
2662}
2663
2664static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2665{
2666 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2667 Sg_device *sdp;
c6517b79 2668 unsigned long iflags;
1da177e4 2669
cc833acb
DG		 2670 if (it && (0 == it->index))
2671 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2672 (int)it->max, sg_big_buff);
1da177e4 2673
c6517b79
TB		 2674 read_lock_irqsave(&sg_index_lock, iflags);
2675 sdp = it ? sg_lookup_dev(it->index) : NULL;
cc833acb
DG		 2676 if (NULL == sdp)
2677 goto skip;
2678 read_lock(&sdp->sfd_lock);
2679 if (!list_empty(&sdp->sfds)) {
c0d3b9c2 2680 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
cc833acb
DG		 2681 if (atomic_read(&sdp->detaching))
2682 seq_puts(s, "detaching pending close ");
2683 else if (sdp->device) {
2684 struct scsi_device *scsidp = sdp->device;
2685
9cb78c16 2686 seq_printf(s, "%d:%d:%d:%llu em=%d",
cc833acb
DG		 2687 scsidp->host->host_no,
2688 scsidp->channel, scsidp->id,
2689 scsidp->lun,
2690 scsidp->host->hostt->emulated);
2691 }
2692 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2693 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
c0d3b9c2 2694 sg_proc_debug_helper(s, sdp);
1da177e4 2695 }
cc833acb
DG		 2696 read_unlock(&sdp->sfd_lock);
2697skip:
c6517b79 2698 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2699 return 0;
2700}
2701
2702#endif /* CONFIG_SCSI_PROC_FS */
2703
2704module_init(init_sg);
2705module_exit(exit_sg);
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