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[SCSI] Revert "sg: push file descriptor list locking down to per-device locking"
[deliverable/linux.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>
a27bb332 38#include <linux/aio.h>
1da177e4
LT		 39#include <linux/errno.h>
40#include <linux/mtio.h>
41#include <linux/ioctl.h>
5a0e3ad6 42#include <linux/slab.h>
1da177e4
LT		 43#include <linux/fcntl.h>
44#include <linux/init.h>
45#include <linux/poll.h>
1da177e4 46#include <linux/moduleparam.h>
1da177e4 47#include <linux/cdev.h>
7c07d613 48#include <linux/idr.h>
1da177e4
LT		 49#include <linux/seq_file.h>
50#include <linux/blkdev.h>
51#include <linux/delay.h>
6da127ad 52#include <linux/blktrace_api.h>
c45d15d2 53#include <linux/mutex.h>
2fe038e3 54#include <linux/ratelimit.h>
1da177e4
LT		 55
56#include "scsi.h"
db9dff36 57#include <scsi/scsi_dbg.h>
1da177e4
LT		 58#include <scsi/scsi_host.h>
59#include <scsi/scsi_driver.h>
60#include <scsi/scsi_ioctl.h>
61#include <scsi/sg.h>
62
63#include "scsi_logging.h"
64
65#ifdef CONFIG_SCSI_PROC_FS
66#include <linux/proc_fs.h>
7ca63cb4 67static char *sg_version_date = "20061027";
1da177e4
LT		 68
69static int sg_proc_init(void);
70static void sg_proc_cleanup(void);
71#endif
72
1da177e4 73#define SG_ALLOW_DIO_DEF 0
1da177e4
LT		 74
75#define SG_MAX_DEVS 32768
76
77/*
78 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
79 * Then when using 32 bit integers x * m may overflow during the calculation.
80 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
81 * calculates the same, but prevents the overflow when both m and d
82 * are "small" numbers (like HZ and USER_HZ).
83 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
84 * in 32 bits.
85 */
86#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
87
88#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
89
90int sg_big_buff = SG_DEF_RESERVED_SIZE;
91/* N.B. This variable is readable and writeable via
92 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
93 of this size (or less if there is not enough memory) will be reserved
94 for use by this file descriptor. [Deprecated usage: this variable is also
95 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
96 the kernel (i.e. it is not a module).] */
97static int def_reserved_size = -1; /* picks up init parameter */
98static int sg_allow_dio = SG_ALLOW_DIO_DEF;
99
6460e75a
DG		 100static int scatter_elem_sz = SG_SCATTER_SZ;
101static int scatter_elem_sz_prev = SG_SCATTER_SZ;
102
1da177e4 103#define SG_SECTOR_SZ 512
1da177e4 104
ee959b00
TJ		 105static int sg_add(struct device *, struct class_interface *);
106static void sg_remove(struct device *, struct class_interface *);
1da177e4 107
7c07d613 108static DEFINE_IDR(sg_index_idr);
c0d3b9c2
JB		 109static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
110 file descriptor list for device */
1da177e4
LT		 111
112static struct class_interface sg_interface = {
ee959b00
TJ		 113 .add_dev = sg_add,
114 .remove_dev = sg_remove,
1da177e4
LT		 115};
116
117typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
118 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 119 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4 120 unsigned bufflen; /* Size of (aggregate) data buffer */
10db10d1
FT		 121 struct page **pages;
122 int page_order;
1da177e4
LT		 123 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
124 unsigned char cmd_opcode; /* first byte of command */
125} Sg_scatter_hold;
126
127struct sg_device; /* forward declarations */
128struct sg_fd;
129
130typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 131 struct sg_request *nextrp; /* NULL -> tail request (slist) */
132 struct sg_fd *parentfp; /* NULL -> not in use */
133 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
134 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 135 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 136 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
137 char orphan; /* 1 -> drop on sight, 0 -> normal */
138 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
6acddc5e
JE		 139 /* done protected by rq_list_lock */
140 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 */
c0d3b9c2
JB		 147 /* sfd_siblings is protected by sg_index_lock */
148 struct list_head sfd_siblings;
1da177e4
LT		 149 struct sg_device *parentdp; /* owning device */
150 wait_queue_head_t read_wait; /* queue read until command done */
151 rwlock_t rq_list_lock; /* protect access to list in req_arr */
152 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
153 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
154 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
155 unsigned save_scat_len; /* original length of trunc. scat. element */
156 Sg_request *headrp; /* head of request slist, NULL->empty */
157 struct fasync_struct *async_qp; /* used by asynchronous notification */
158 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
159 char low_dma; /* as in parent but possibly overridden to 1 */
160 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
1da177e4
LT		 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;
1da177e4 171 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 172 u32 index; /* device index number */
c0d3b9c2 173 /* sfds is protected by sg_index_lock */
3442f802 174 struct list_head sfds;
15b06f9a 175 struct rw_semaphore o_sem; /* exclude open should hold this rwsem */
1da177e4 176 volatile char detached; /* 0->attached, 1->detached pending removal */
b499e524 177 char exclude; /* opened for exclusive access */
1da177e4
LT		 178 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
179 struct gendisk *disk;
180 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
c6517b79 181 struct kref d_ref;
1da177e4
LT		 182} Sg_device;
183
d6b10348 184/* tasklet or soft irq callback */
a91a3a20 185static void sg_rq_end_io(struct request *rq, int uptodate);
10865dfa 186static int sg_start_req(Sg_request *srp, unsigned char *cmd);
e7ee4cc0 187static int sg_finish_rem_req(Sg_request * srp);
1da177e4 188static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
1da177e4
LT		 189static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
190 Sg_request * srp);
0b07de85
AG		 191static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
192 const char __user *buf, size_t count, int blocking,
a2dd3b4c 193 int read_only, int sg_io_owned, Sg_request **o_srp);
1da177e4
LT		 194static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
195 unsigned char *cmnd, int timeout, int blocking);
1da177e4
LT		 196static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
197static void sg_remove_scat(Sg_scatter_hold * schp);
198static void sg_build_reserve(Sg_fd * sfp, int req_size);
199static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
200static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
1da177e4 201static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
c6517b79 202static void sg_remove_sfp(struct kref *);
1da177e4
LT		 203static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
204static Sg_request *sg_add_request(Sg_fd * sfp);
205static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
206static int sg_res_in_use(Sg_fd * sfp);
1da177e4 207static Sg_device *sg_get_dev(int dev);
c6517b79 208static void sg_put_dev(Sg_device *sdp);
1da177e4 209
1da177e4
LT		 210#define SZ_SG_HEADER sizeof(struct sg_header)
211#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
212#define SZ_SG_IOVEC sizeof(sg_iovec_t)
213#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
214
14e507b8
FT		 215static int sg_allow_access(struct file *filp, unsigned char *cmd)
216{
35df8397 217 struct sg_fd *sfp = filp->private_data;
14e507b8
FT		 218
219 if (sfp->parentdp->device->type == TYPE_SCANNER)
220 return 0;
221
018e0446 222 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
14e507b8
FT		 223}
224
035d12e6
JE		 225static int sfds_list_empty(Sg_device *sdp)
226{
227 unsigned long flags;
228 int ret;
229
c0d3b9c2 230 read_lock_irqsave(&sg_index_lock, flags);
035d12e6 231 ret = list_empty(&sdp->sfds);
c0d3b9c2 232 read_unlock_irqrestore(&sg_index_lock, flags);
035d12e6
JE		 233 return ret;
234}
235
1da177e4
LT		 236static int
237sg_open(struct inode *inode, struct file *filp)
238{
239 int dev = iminor(inode);
240 int flags = filp->f_flags;
d6b10348 241 struct request_queue *q;
1da177e4
LT		 242 Sg_device *sdp;
243 Sg_fd *sfp;
1da177e4
LT		 244 int retval;
245
246 nonseekable_open(inode, filp);
247 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
248 sdp = sg_get_dev(dev);
c6517b79
TB		 249 if (IS_ERR(sdp)) {
250 retval = PTR_ERR(sdp);
251 sdp = NULL;
252 goto sg_put;
eb09d3d4 253 }
1da177e4
LT		 254
255 /* This driver's module count bumped by fops_get in <linux/fs.h> */
256 /* Prevent the device driver from vanishing while we sleep */
257 retval = scsi_device_get(sdp->device);
c6517b79
TB		 258 if (retval)
259 goto sg_put;
1da177e4 260
bc4f2401
AS		 261 retval = scsi_autopm_get_device(sdp->device);
262 if (retval)
263 goto sdp_put;
264
1da177e4
LT		 265 if (!((flags & O_NONBLOCK) ||
266 scsi_block_when_processing_errors(sdp->device))) {
267 retval = -ENXIO;
268 /* we are in error recovery for this device */
269 goto error_out;
270 }
271
15b06f9a
VC		 272 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) {
273 retval = -EPERM; /* Can't lock it with read only access */
274 goto error_out;
275 }
276 if (flags & O_NONBLOCK) {
277 if (flags & O_EXCL) {
278 if (!down_write_trylock(&sdp->o_sem)) {
279 retval = -EBUSY;
280 goto error_out;
281 }
282 } else {
283 if (!down_read_trylock(&sdp->o_sem)) {
284 retval = -EBUSY;
285 goto error_out;
286 }
1da177e4 287 }
15b06f9a
VC		 288 } else {
289 if (flags & O_EXCL)
290 down_write(&sdp->o_sem);
291 else
292 down_read(&sdp->o_sem);
1da177e4 293 }
15b06f9a
VC		 294 /* Since write lock is held, no need to check sfd_list */
295 if (flags & O_EXCL)
00b2d9d6 296 sdp->exclude = 1; /* used by release lock */
15b06f9a 297
035d12e6 298 if (sfds_list_empty(sdp)) { /* no existing opens on this device */
1da177e4 299 sdp->sgdebug = 0;
d6b10348 300 q = sdp->device->request_queue;
8a78362c 301 sdp->sg_tablesize = queue_max_segments(q);
1da177e4 302 }
e32c9e63
VC		 303 sfp = sg_add_sfp(sdp, dev);
304 if (!IS_ERR(sfp))
1da177e4 305 filp->private_data = sfp;
15b06f9a
VC		 306 /* retval is already provably zero at this point because of the
307 * check after retval = scsi_autopm_get_device(sdp->device))
308 */
1da177e4 309 else {
e32c9e63
VC		 310 retval = PTR_ERR(sfp);
311
c6517b79 312 if (flags & O_EXCL) {
00b2d9d6 313 sdp->exclude = 0; /* undo if error */
15b06f9a
VC		 314 up_write(&sdp->o_sem);
315 } else
316 up_read(&sdp->o_sem);
c6517b79 317error_out:
bc4f2401
AS		 318 scsi_autopm_put_device(sdp->device);
319sdp_put:
c6517b79 320 scsi_device_put(sdp->device);
bc4f2401 321 }
c6517b79
TB		 322sg_put:
323 if (sdp)
324 sg_put_dev(sdp);
1da177e4
LT		 325 return retval;
326}
327
328/* Following function was formerly called 'sg_close' */
329static int
330sg_release(struct inode *inode, struct file *filp)
331{
332 Sg_device *sdp;
333 Sg_fd *sfp;
15b06f9a 334 int excl;
1da177e4
LT		 335
336 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
337 return -ENXIO;
338 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
c6517b79 339
00b2d9d6
VC		 340 excl = sdp->exclude;
341 sdp->exclude = 0;
15b06f9a
VC		 342 if (excl)
343 up_write(&sdp->o_sem);
344 else
345 up_read(&sdp->o_sem);
c6517b79 346
bc4f2401 347 scsi_autopm_put_device(sdp->device);
c6517b79 348 kref_put(&sfp->f_ref, sg_remove_sfp);
1da177e4
LT		 349 return 0;
350}
351
352static ssize_t
353sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
354{
1da177e4
LT		 355 Sg_device *sdp;
356 Sg_fd *sfp;
357 Sg_request *srp;
358 int req_pack_id = -1;
1da177e4 359 sg_io_hdr_t *hp;
cb59e840 360 struct sg_header *old_hdr = NULL;
361 int retval = 0;
1da177e4
LT		 362
363 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
364 return -ENXIO;
365 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
366 sdp->disk->disk_name, (int) count));
d6b10348 367
1da177e4
LT		 368 if (!access_ok(VERIFY_WRITE, buf, count))
369 return -EFAULT;
370 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840 371 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
372 if (!old_hdr)
373 return -ENOMEM;
374 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
375 retval = -EFAULT;
376 goto free_old_hdr;
377 }
378 if (old_hdr->reply_len < 0) {
1da177e4 379 if (count >= SZ_SG_IO_HDR) {
cb59e840 380 sg_io_hdr_t *new_hdr;
381 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
382 if (!new_hdr) {
383 retval = -ENOMEM;
384 goto free_old_hdr;
385 }
386 retval =__copy_from_user
387 (new_hdr, buf, SZ_SG_IO_HDR);
388 req_pack_id = new_hdr->pack_id;
389 kfree(new_hdr);
390 if (retval) {
391 retval = -EFAULT;
392 goto free_old_hdr;
393 }
1da177e4
LT		 394 }
395 } else
cb59e840 396 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 397 }
398 srp = sg_get_rq_mark(sfp, req_pack_id);
399 if (!srp) { /* now wait on packet to arrive */
cb59e840 400 if (sdp->detached) {
401 retval = -ENODEV;
402 goto free_old_hdr;
403 }
404 if (filp->f_flags & O_NONBLOCK) {
405 retval = -EAGAIN;
406 goto free_old_hdr;
407 }
3f0c6aba 408 retval = wait_event_interruptible(sfp->read_wait,
794c10fa 409 (sdp->detached ||
3f0c6aba 410 (srp = sg_get_rq_mark(sfp, req_pack_id))));
794c10fa
JE		 411 if (sdp->detached) {
412 retval = -ENODEV;
413 goto free_old_hdr;
414 }
415 if (retval) {
cb59e840 416 /* -ERESTARTSYS as signal hit process */
417 goto free_old_hdr;
1da177e4
LT		 418 }
419 }
cb59e840 420 if (srp->header.interface_id != '\0') {
421 retval = sg_new_read(sfp, buf, count, srp);
422 goto free_old_hdr;
423 }
1da177e4
LT		 424
425 hp = &srp->header;
cb59e840 426 if (old_hdr == NULL) {
427 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
428 if (! old_hdr) {
429 retval = -ENOMEM;
430 goto free_old_hdr;
431 }
432 }
433 memset(old_hdr, 0, SZ_SG_HEADER);
434 old_hdr->reply_len = (int) hp->timeout;
435 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
436 old_hdr->pack_id = hp->pack_id;
437 old_hdr->twelve_byte =
1da177e4 438 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840 439 old_hdr->target_status = hp->masked_status;
440 old_hdr->host_status = hp->host_status;
441 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 442 if ((CHECK_CONDITION & hp->masked_status) ||
443 (DRIVER_SENSE & hp->driver_status))
cb59e840 444 memcpy(old_hdr->sense_buffer, srp->sense_b,
445 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 446 switch (hp->host_status) {
447 /* This setup of 'result' is for backward compatibility and is best
448 ignored by the user who should use target, host + driver status */
449 case DID_OK:
450 case DID_PASSTHROUGH:
451 case DID_SOFT_ERROR:
cb59e840 452 old_hdr->result = 0;
1da177e4
LT		 453 break;
454 case DID_NO_CONNECT:
455 case DID_BUS_BUSY:
456 case DID_TIME_OUT:
cb59e840 457 old_hdr->result = EBUSY;
1da177e4
LT		 458 break;
459 case DID_BAD_TARGET:
460 case DID_ABORT:
461 case DID_PARITY:
462 case DID_RESET:
463 case DID_BAD_INTR:
cb59e840 464 old_hdr->result = EIO;
1da177e4
LT		 465 break;
466 case DID_ERROR:
cb59e840 467 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 468 hp->masked_status == GOOD) ? 0 : EIO;
469 break;
470 default:
cb59e840 471 old_hdr->result = EIO;
1da177e4
LT		 472 break;
473 }
474
475 /* Now copy the result back to the user buffer. */
476 if (count >= SZ_SG_HEADER) {
cb59e840 477 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
478 retval = -EFAULT;
479 goto free_old_hdr;
480 }
1da177e4 481 buf += SZ_SG_HEADER;
cb59e840 482 if (count > old_hdr->reply_len)
483 count = old_hdr->reply_len;
1da177e4 484 if (count > SZ_SG_HEADER) {
cb59e840 485 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
486 retval = -EFAULT;
487 goto free_old_hdr;
488 }
1da177e4
LT		 489 }
490 } else
cb59e840 491 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 492 sg_finish_rem_req(srp);
cb59e840 493 retval = count;
494free_old_hdr:
c9475cb0 495 kfree(old_hdr);
cb59e840 496 return retval;
1da177e4
LT		 497}
498
499static ssize_t
500sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
501{
502 sg_io_hdr_t *hp = &srp->header;
503 int err = 0;
504 int len;
505
506 if (count < SZ_SG_IO_HDR) {
507 err = -EINVAL;
508 goto err_out;
509 }
510 hp->sb_len_wr = 0;
511 if ((hp->mx_sb_len > 0) && hp->sbp) {
512 if ((CHECK_CONDITION & hp->masked_status) ||
513 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 514 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 515 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
516 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
517 len = (len > sb_len) ? sb_len : len;
518 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
519 err = -EFAULT;
520 goto err_out;
521 }
522 hp->sb_len_wr = len;
523 }
524 }
525 if (hp->masked_status || hp->host_status || hp->driver_status)
526 hp->info |= SG_INFO_CHECK;
527 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
528 err = -EFAULT;
529 goto err_out;
530 }
0b6cb26c 531err_out:
e7ee4cc0 532 err = sg_finish_rem_req(srp);
1da177e4
LT		 533 return (0 == err) ? count : err;
534}
535
536static ssize_t
537sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
538{
539 int mxsize, cmd_size, k;
540 int input_size, blocking;
541 unsigned char opcode;
542 Sg_device *sdp;
543 Sg_fd *sfp;
544 Sg_request *srp;
545 struct sg_header old_hdr;
546 sg_io_hdr_t *hp;
d6b10348 547 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 548
549 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
550 return -ENXIO;
551 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
552 sdp->disk->disk_name, (int) count));
553 if (sdp->detached)
554 return -ENODEV;
555 if (!((filp->f_flags & O_NONBLOCK) ||
556 scsi_block_when_processing_errors(sdp->device)))
557 return -ENXIO;
558
559 if (!access_ok(VERIFY_READ, buf, count))
560 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
561 if (count < SZ_SG_HEADER)
562 return -EIO;
563 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
564 return -EFAULT;
565 blocking = !(filp->f_flags & O_NONBLOCK);
566 if (old_hdr.reply_len < 0)
a2dd3b4c
TB		 567 return sg_new_write(sfp, filp, buf, count,
568 blocking, 0, 0, NULL);
1da177e4
LT		 569 if (count < (SZ_SG_HEADER + 6))
570 return -EIO; /* The minimum scsi command length is 6 bytes. */
571
572 if (!(srp = sg_add_request(sfp))) {
573 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
574 return -EDOM;
575 }
576 buf += SZ_SG_HEADER;
577 __get_user(opcode, buf);
578 if (sfp->next_cmd_len > 0) {
579 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
580 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
581 sfp->next_cmd_len = 0;
582 sg_remove_request(sfp, srp);
583 return -EIO;
584 }
585 cmd_size = sfp->next_cmd_len;
586 sfp->next_cmd_len = 0; /* reset so only this write() effected */
587 } else {
588 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
589 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
590 cmd_size = 12;
591 }
592 SCSI_LOG_TIMEOUT(4, printk(
593 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
594/* Determine buffer size. */
595 input_size = count - cmd_size;
596 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
597 mxsize -= SZ_SG_HEADER;
598 input_size -= SZ_SG_HEADER;
599 if (input_size < 0) {
600 sg_remove_request(sfp, srp);
601 return -EIO; /* User did not pass enough bytes for this command. */
602 }
603 hp = &srp->header;
604 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
605 hp->cmd_len = (unsigned char) cmd_size;
606 hp->iovec_count = 0;
607 hp->mx_sb_len = 0;
608 if (input_size > 0)
609 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
610 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
611 else
612 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
613 hp->dxfer_len = mxsize;
fad7f01e
FT		 614 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
615 hp->dxferp = (char __user *)buf + cmd_size;
616 else
617 hp->dxferp = NULL;
1da177e4
LT		 618 hp->sbp = NULL;
619 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
620 hp->flags = input_size; /* structure abuse ... */
621 hp->pack_id = old_hdr.pack_id;
622 hp->usr_ptr = NULL;
623 if (__copy_from_user(cmnd, buf, cmd_size))
624 return -EFAULT;
625 /*
626 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
627 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
628 * is a non-zero input_size, so emit a warning.
629 */
eaa3e22e
AK		 630 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
631 static char cmd[TASK_COMM_LEN];
2fe038e3
CD		 632 if (strcmp(current->comm, cmd)) {
633 printk_ratelimited(KERN_WARNING
634 "sg_write: data in/out %d/%d bytes "
635 "for SCSI command 0x%x-- guessing "
636 "data in;\n program %s not setting "
637 "count and/or reply_len properly\n",
638 old_hdr.reply_len - (int)SZ_SG_HEADER,
639 input_size, (unsigned int) cmnd[0],
640 current->comm);
eaa3e22e
AK		 641 strcpy(cmd, current->comm);
642 }
643 }
1da177e4
LT		 644 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
645 return (k < 0) ? k : count;
646}
647
648static ssize_t
0b07de85 649sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
a2dd3b4c 650 size_t count, int blocking, int read_only, int sg_io_owned,
0b07de85 651 Sg_request **o_srp)
1da177e4
LT		 652{
653 int k;
654 Sg_request *srp;
655 sg_io_hdr_t *hp;
d6b10348 656 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 657 int timeout;
658 unsigned long ul_timeout;
659
660 if (count < SZ_SG_IO_HDR)
661 return -EINVAL;
662 if (!access_ok(VERIFY_READ, buf, count))
663 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
664
665 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
666 if (!(srp = sg_add_request(sfp))) {
667 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
668 return -EDOM;
669 }
a2dd3b4c 670 srp->sg_io_owned = sg_io_owned;
1da177e4
LT		 671 hp = &srp->header;
672 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
673 sg_remove_request(sfp, srp);
674 return -EFAULT;
675 }
676 if (hp->interface_id != 'S') {
677 sg_remove_request(sfp, srp);
678 return -ENOSYS;
679 }
680 if (hp->flags & SG_FLAG_MMAP_IO) {
681 if (hp->dxfer_len > sfp->reserve.bufflen) {
682 sg_remove_request(sfp, srp);
683 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
684 }
685 if (hp->flags & SG_FLAG_DIRECT_IO) {
686 sg_remove_request(sfp, srp);
687 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
688 }
689 if (sg_res_in_use(sfp)) {
690 sg_remove_request(sfp, srp);
691 return -EBUSY; /* reserve buffer already being used */
692 }
693 }
694 ul_timeout = msecs_to_jiffies(srp->header.timeout);
695 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
696 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
697 sg_remove_request(sfp, srp);
698 return -EMSGSIZE;
699 }
700 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
701 sg_remove_request(sfp, srp);
702 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
703 }
704 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
705 sg_remove_request(sfp, srp);
706 return -EFAULT;
707 }
14e507b8 708 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 709 sg_remove_request(sfp, srp);
710 return -EPERM;
711 }
712 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
713 if (k < 0)
714 return k;
715 if (o_srp)
716 *o_srp = srp;
717 return count;
718}
719
720static int
721sg_common_write(Sg_fd * sfp, Sg_request * srp,
722 unsigned char *cmnd, int timeout, int blocking)
723{
d6b10348 724 int k, data_dir;
1da177e4
LT		 725 Sg_device *sdp = sfp->parentdp;
726 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 727
728 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
729 hp->status = 0;
730 hp->masked_status = 0;
731 hp->msg_status = 0;
732 hp->info = 0;
733 hp->host_status = 0;
734 hp->driver_status = 0;
735 hp->resid = 0;
736 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
737 (int) cmnd[0], (int) hp->cmd_len));
738
10865dfa
FT		 739 k = sg_start_req(srp, cmnd);
740 if (k) {
7ca63cb4 741 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 742 sg_finish_rem_req(srp);
743 return k; /* probably out of space --> ENOMEM */
744 }
1da177e4 745 if (sdp->detached) {
caf19d38
FT		 746 if (srp->bio)
747 blk_end_request_all(srp->rq, -EIO);
1da177e4
LT		 748 sg_finish_rem_req(srp);
749 return -ENODEV;
750 }
1da177e4 751
1da177e4
LT		 752 switch (hp->dxfer_direction) {
753 case SG_DXFER_TO_FROM_DEV:
754 case SG_DXFER_FROM_DEV:
d6b10348 755 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 756 break;
757 case SG_DXFER_TO_DEV:
d6b10348 758 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 759 break;
760 case SG_DXFER_UNKNOWN:
d6b10348 761 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 762 break;
763 default:
d6b10348 764 data_dir = DMA_NONE;
1da177e4
LT		 765 break;
766 }
cb59e840 767 hp->duration = jiffies_to_msecs(jiffies);
10db10d1
FT		 768
769 srp->rq->timeout = timeout;
c6517b79 770 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
10db10d1
FT		 771 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
772 srp->rq, 1, sg_rq_end_io);
773 return 0;
1da177e4
LT		 774}
775
6acddc5e
JE		 776static int srp_done(Sg_fd *sfp, Sg_request *srp)
777{
778 unsigned long flags;
779 int ret;
780
781 read_lock_irqsave(&sfp->rq_list_lock, flags);
782 ret = srp->done;
783 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
784 return ret;
785}
786
37b9d1e0 787static long
f4927c45 788sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 789{
790 void __user *p = (void __user *)arg;
791 int __user *ip = p;
792 int result, val, read_only;
793 Sg_device *sdp;
794 Sg_fd *sfp;
795 Sg_request *srp;
796 unsigned long iflags;
797
798 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
799 return -ENXIO;
abf54393 800
1da177e4
LT		 801 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
802 sdp->disk->disk_name, (int) cmd_in));
803 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
804
805 switch (cmd_in) {
806 case SG_IO:
dddbf8d9
JE		 807 if (sdp->detached)
808 return -ENODEV;
809 if (!scsi_block_when_processing_errors(sdp->device))
810 return -ENXIO;
811 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
812 return -EFAULT;
813 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
814 1, read_only, 1, &srp);
815 if (result < 0)
816 return result;
3f0c6aba 817 result = wait_event_interruptible(sfp->read_wait,
6acddc5e 818 (srp_done(sfp, srp) || sdp->detached));
794c10fa
JE		 819 if (sdp->detached)
820 return -ENODEV;
821 write_lock_irq(&sfp->rq_list_lock);
822 if (srp->done) {
823 srp->done = 2;
dddbf8d9 824 write_unlock_irq(&sfp->rq_list_lock);
794c10fa
JE		 825 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
826 return (result < 0) ? result : 0;
1da177e4 827 }
794c10fa
JE		 828 srp->orphan = 1;
829 write_unlock_irq(&sfp->rq_list_lock);
830 return result; /* -ERESTARTSYS because signal hit process */
1da177e4
LT		 831 case SG_SET_TIMEOUT:
832 result = get_user(val, ip);
833 if (result)
834 return result;
835 if (val < 0)
836 return -EIO;
837 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
838 val = MULDIV (INT_MAX, USER_HZ, HZ);
839 sfp->timeout_user = val;
840 sfp->timeout = MULDIV (val, HZ, USER_HZ);
841
842 return 0;
843 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
844 /* strange ..., for backward compatibility */
845 return sfp->timeout_user;
846 case SG_SET_FORCE_LOW_DMA:
847 result = get_user(val, ip);
848 if (result)
849 return result;
850 if (val) {
851 sfp->low_dma = 1;
852 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
853 val = (int) sfp->reserve.bufflen;
854 sg_remove_scat(&sfp->reserve);
855 sg_build_reserve(sfp, val);
856 }
857 } else {
858 if (sdp->detached)
859 return -ENODEV;
860 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
861 }
862 return 0;
863 case SG_GET_LOW_DMA:
864 return put_user((int) sfp->low_dma, ip);
865 case SG_GET_SCSI_ID:
866 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
867 return -EFAULT;
868 else {
869 sg_scsi_id_t __user *sg_idp = p;
870
871 if (sdp->detached)
872 return -ENODEV;
873 __put_user((int) sdp->device->host->host_no,
874 &sg_idp->host_no);
875 __put_user((int) sdp->device->channel,
876 &sg_idp->channel);
877 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
878 __put_user((int) sdp->device->lun, &sg_idp->lun);
879 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
880 __put_user((short) sdp->device->host->cmd_per_lun,
881 &sg_idp->h_cmd_per_lun);
882 __put_user((short) sdp->device->queue_depth,
883 &sg_idp->d_queue_depth);
884 __put_user(0, &sg_idp->unused[0]);
885 __put_user(0, &sg_idp->unused[1]);
886 return 0;
887 }
888 case SG_SET_FORCE_PACK_ID:
889 result = get_user(val, ip);
890 if (result)
891 return result;
892 sfp->force_packid = val ? 1 : 0;
893 return 0;
894 case SG_GET_PACK_ID:
895 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
896 return -EFAULT;
897 read_lock_irqsave(&sfp->rq_list_lock, iflags);
898 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
899 if ((1 == srp->done) && (!srp->sg_io_owned)) {
900 read_unlock_irqrestore(&sfp->rq_list_lock,
901 iflags);
902 __put_user(srp->header.pack_id, ip);
903 return 0;
904 }
905 }
906 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
907 __put_user(-1, ip);
908 return 0;
909 case SG_GET_NUM_WAITING:
910 read_lock_irqsave(&sfp->rq_list_lock, iflags);
911 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
912 if ((1 == srp->done) && (!srp->sg_io_owned))
913 ++val;
914 }
915 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
916 return put_user(val, ip);
917 case SG_GET_SG_TABLESIZE:
918 return put_user(sdp->sg_tablesize, ip);
919 case SG_SET_RESERVED_SIZE:
920 result = get_user(val, ip);
921 if (result)
922 return result;
923 if (val < 0)
924 return -EINVAL;
44ec9542 925 val = min_t(int, val,
ae03bf63 926 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 927 if (val != sfp->reserve.bufflen) {
928 if (sg_res_in_use(sfp) || sfp->mmap_called)
929 return -EBUSY;
930 sg_remove_scat(&sfp->reserve);
931 sg_build_reserve(sfp, val);
932 }
933 return 0;
934 case SG_GET_RESERVED_SIZE:
44ec9542 935 val = min_t(int, sfp->reserve.bufflen,
ae03bf63 936 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 937 return put_user(val, ip);
938 case SG_SET_COMMAND_Q:
939 result = get_user(val, ip);
940 if (result)
941 return result;
942 sfp->cmd_q = val ? 1 : 0;
943 return 0;
944 case SG_GET_COMMAND_Q:
945 return put_user((int) sfp->cmd_q, ip);
946 case SG_SET_KEEP_ORPHAN:
947 result = get_user(val, ip);
948 if (result)
949 return result;
950 sfp->keep_orphan = val;
951 return 0;
952 case SG_GET_KEEP_ORPHAN:
953 return put_user((int) sfp->keep_orphan, ip);
954 case SG_NEXT_CMD_LEN:
955 result = get_user(val, ip);
956 if (result)
957 return result;
958 sfp->next_cmd_len = (val > 0) ? val : 0;
959 return 0;
960 case SG_GET_VERSION_NUM:
961 return put_user(sg_version_num, ip);
962 case SG_GET_ACCESS_COUNT:
963 /* faked - we don't have a real access count anymore */
964 val = (sdp->device ? 1 : 0);
965 return put_user(val, ip);
966 case SG_GET_REQUEST_TABLE:
967 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
968 return -EFAULT;
969 else {
cb59e840 970 sg_req_info_t *rinfo;
971 unsigned int ms;
972
973 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
974 GFP_KERNEL);
975 if (!rinfo)
976 return -ENOMEM;
1da177e4
LT		 977 read_lock_irqsave(&sfp->rq_list_lock, iflags);
978 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
979 ++val, srp = srp ? srp->nextrp : srp) {
980 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
981 if (srp) {
982 rinfo[val].req_state = srp->done + 1;
983 rinfo[val].problem =
984 srp->header.masked_status &
985 srp->header.host_status &
986 srp->header.driver_status;
cb59e840 987 if (srp->done)
988 rinfo[val].duration =
989 srp->header.duration;
990 else {
991 ms = jiffies_to_msecs(jiffies);
992 rinfo[val].duration =
993 (ms > srp->header.duration) ?
994 (ms - srp->header.duration) : 0;
995 }
1da177e4 996 rinfo[val].orphan = srp->orphan;
cb59e840 997 rinfo[val].sg_io_owned =
998 srp->sg_io_owned;
999 rinfo[val].pack_id =
1000 srp->header.pack_id;
1001 rinfo[val].usr_ptr =
1002 srp->header.usr_ptr;
1da177e4
LT		 1003 }
1004 }
1005 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840 1006 result = __copy_to_user(p, rinfo,
1007 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1008 result = result ? -EFAULT : 0;
1009 kfree(rinfo);
1010 return result;
1da177e4
LT		 1011 }
1012 case SG_EMULATED_HOST:
1013 if (sdp->detached)
1014 return -ENODEV;
1015 return put_user(sdp->device->host->hostt->emulated, ip);
1016 case SG_SCSI_RESET:
1017 if (sdp->detached)
1018 return -ENODEV;
1019 if (filp->f_flags & O_NONBLOCK) {
939647ee 1020 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1021 return -EBUSY;
1022 } else if (!scsi_block_when_processing_errors(sdp->device))
1023 return -EBUSY;
1024 result = get_user(val, ip);
1025 if (result)
1026 return result;
1027 if (SG_SCSI_RESET_NOTHING == val)
1028 return 0;
1029 switch (val) {
1030 case SG_SCSI_RESET_DEVICE:
1031 val = SCSI_TRY_RESET_DEVICE;
1032 break;
39120e11
BK		 1033 case SG_SCSI_RESET_TARGET:
1034 val = SCSI_TRY_RESET_TARGET;
1035 break;
1da177e4
LT		 1036 case SG_SCSI_RESET_BUS:
1037 val = SCSI_TRY_RESET_BUS;
1038 break;
1039 case SG_SCSI_RESET_HOST:
1040 val = SCSI_TRY_RESET_HOST;
1041 break;
1042 default:
1043 return -EINVAL;
1044 }
1045 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1046 return -EACCES;
1047 return (scsi_reset_provider(sdp->device, val) ==
1048 SUCCESS) ? 0 : -EIO;
1049 case SCSI_IOCTL_SEND_COMMAND:
1050 if (sdp->detached)
1051 return -ENODEV;
1052 if (read_only) {
1053 unsigned char opcode = WRITE_6;
1054 Scsi_Ioctl_Command __user *siocp = p;
1055
1056 if (copy_from_user(&opcode, siocp->data, 1))
1057 return -EFAULT;
14e507b8 1058 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1059 return -EPERM;
1060 }
e915e872 1061 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1da177e4
LT		 1062 case SG_SET_DEBUG:
1063 result = get_user(val, ip);
1064 if (result)
1065 return result;
1066 sdp->sgdebug = (char) val;
1067 return 0;
1068 case SCSI_IOCTL_GET_IDLUN:
1069 case SCSI_IOCTL_GET_BUS_NUMBER:
1070 case SCSI_IOCTL_PROBE_HOST:
1071 case SG_GET_TRANSFORM:
1072 if (sdp->detached)
1073 return -ENODEV;
1074 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542 1075 case BLKSECTGET:
ae03bf63 1076 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
44ec9542 1077 ip);
6da127ad
CS		 1078 case BLKTRACESETUP:
1079 return blk_trace_setup(sdp->device->request_queue,
1080 sdp->disk->disk_name,
76e3a19d 1081 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
d0deef5b 1082 NULL,
6da127ad
CS		 1083 (char *)arg);
1084 case BLKTRACESTART:
1085 return blk_trace_startstop(sdp->device->request_queue, 1);
1086 case BLKTRACESTOP:
1087 return blk_trace_startstop(sdp->device->request_queue, 0);
1088 case BLKTRACETEARDOWN:
1089 return blk_trace_remove(sdp->device->request_queue);
1da177e4
LT		 1090 default:
1091 if (read_only)
1092 return -EPERM; /* don't know so take safe approach */
1093 return scsi_ioctl(sdp->device, cmd_in, p);
1094 }
1095}
1096
1097#ifdef CONFIG_COMPAT
1098static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1099{
1100 Sg_device *sdp;
1101 Sg_fd *sfp;
1102 struct scsi_device *sdev;
1103
1104 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1105 return -ENXIO;
1106
1107 sdev = sdp->device;
1108 if (sdev->host->hostt->compat_ioctl) {
1109 int ret;
1110
1111 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1112
1113 return ret;
1114 }
1115
1116 return -ENOIOCTLCMD;
1117}
1118#endif
1119
1120static unsigned int
1121sg_poll(struct file *filp, poll_table * wait)
1122{
1123 unsigned int res = 0;
1124 Sg_device *sdp;
1125 Sg_fd *sfp;
1126 Sg_request *srp;
1127 int count = 0;
1128 unsigned long iflags;
1129
ebaf466b
JE		 1130 sfp = filp->private_data;
1131 if (!sfp)
1132 return POLLERR;
1133 sdp = sfp->parentdp;
1134 if (!sdp)
1da177e4
LT		 1135 return POLLERR;
1136 poll_wait(filp, &sfp->read_wait, wait);
1137 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1138 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1139 /* if any read waiting, flag it */
1140 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1141 res = POLLIN | POLLRDNORM;
1142 ++count;
1143 }
1144 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1145
1146 if (sdp->detached)
1147 res |= POLLHUP;
1148 else if (!sfp->cmd_q) {
1149 if (0 == count)
1150 res |= POLLOUT | POLLWRNORM;
1151 } else if (count < SG_MAX_QUEUE)
1152 res |= POLLOUT | POLLWRNORM;
1153 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1154 sdp->disk->disk_name, (int) res));
1155 return res;
1156}
1157
1158static int
1159sg_fasync(int fd, struct file *filp, int mode)
1160{
1da177e4
LT		 1161 Sg_device *sdp;
1162 Sg_fd *sfp;
1163
1164 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1165 return -ENXIO;
1166 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1167 sdp->disk->disk_name, mode));
1168
60aa4924 1169 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1da177e4
LT		 1170}
1171
a13ff0bb
NP		 1172static int
1173sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1174{
1175 Sg_fd *sfp;
d6b10348 1176 unsigned long offset, len, sa;
1da177e4 1177 Sg_scatter_hold *rsv_schp;
10db10d1 1178 int k, length;
1da177e4
LT		 1179
1180 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1181 return VM_FAULT_SIGBUS;
1da177e4 1182 rsv_schp = &sfp->reserve;
a13ff0bb 1183 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1184 if (offset >= rsv_schp->bufflen)
a13ff0bb
NP		 1185 return VM_FAULT_SIGBUS;
1186 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1da177e4 1187 offset, rsv_schp->k_use_sg));
d6b10348 1188 sa = vma->vm_start;
10db10d1
FT		 1189 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1190 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1191 len = vma->vm_end - sa;
10db10d1 1192 len = (len < length) ? len : length;
d6b10348 1193 if (offset < len) {
10db10d1
FT		 1194 struct page *page = nth_page(rsv_schp->pages[k],
1195 offset >> PAGE_SHIFT);
d6b10348 1196 get_page(page); /* increment page count */
a13ff0bb
NP		 1197 vmf->page = page;
1198 return 0; /* success */
1da177e4 1199 }
d6b10348
MC		 1200 sa += len;
1201 offset -= len;
1da177e4 1202 }
d6b10348 1203
a13ff0bb 1204 return VM_FAULT_SIGBUS;
1da177e4
LT		 1205}
1206
f0f37e2f 1207static const struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1208 .fault = sg_vma_fault,
1da177e4
LT		 1209};
1210
1211static int
1212sg_mmap(struct file *filp, struct vm_area_struct *vma)
1213{
1214 Sg_fd *sfp;
d6b10348 1215 unsigned long req_sz, len, sa;
1da177e4 1216 Sg_scatter_hold *rsv_schp;
10db10d1 1217 int k, length;
1da177e4
LT		 1218
1219 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1220 return -ENXIO;
cb59e840 1221 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1222 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1223 (void *) vma->vm_start, (int) req_sz));
1224 if (vma->vm_pgoff)
1225 return -EINVAL; /* want no offset */
1226 rsv_schp = &sfp->reserve;
1227 if (req_sz > rsv_schp->bufflen)
1228 return -ENOMEM; /* cannot map more than reserved buffer */
1229
d6b10348 1230 sa = vma->vm_start;
10db10d1
FT		 1231 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1232 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1233 len = vma->vm_end - sa;
10db10d1 1234 len = (len < length) ? len : length;
d6b10348 1235 sa += len;
1da177e4 1236 }
d6b10348 1237
f9aed0e2 1238 sfp->mmap_called = 1;
314e51b9 1239 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1da177e4
LT		 1240 vma->vm_private_data = sfp;
1241 vma->vm_ops = &sg_mmap_vm_ops;
1242 return 0;
1243}
1244
c96952ed
FT		 1245static void sg_rq_end_io_usercontext(struct work_struct *work)
1246{
1247 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1248 struct sg_fd *sfp = srp->parentfp;
1249
1250 sg_finish_rem_req(srp);
1251 kref_put(&sfp->f_ref, sg_remove_sfp);
1252}
1253
a91a3a20
FT		 1254/*
1255 * This function is a "bottom half" handler that is called by the mid
1256 * level when a command is completed (or has failed).
1257 */
1258static void sg_rq_end_io(struct request *rq, int uptodate)
1da177e4 1259{
a91a3a20 1260 struct sg_request *srp = rq->end_io_data;
c6517b79 1261 Sg_device *sdp;
1da177e4 1262 Sg_fd *sfp;
1da177e4 1263 unsigned long iflags;
cb59e840 1264 unsigned int ms;
a91a3a20 1265 char *sense;
c6517b79 1266 int result, resid, done = 1;
1da177e4 1267
c6517b79 1268 if (WARN_ON(srp->done != 0))
1da177e4 1269 return;
c6517b79 1270
1da177e4 1271 sfp = srp->parentfp;
c6517b79 1272 if (WARN_ON(sfp == NULL))
1da177e4 1273 return;
c6517b79
TB		 1274
1275 sdp = sfp->parentdp;
1276 if (unlikely(sdp->detached))
1277 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1da177e4 1278
a91a3a20
FT		 1279 sense = rq->sense;
1280 result = rq->errors;
c3a4d78c 1281 resid = rq->resid_len;
1da177e4
LT		 1282
1283 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1284 sdp->disk->disk_name, srp->header.pack_id, result));
1285 srp->header.resid = resid;
cb59e840 1286 ms = jiffies_to_msecs(jiffies);
1287 srp->header.duration = (ms > srp->header.duration) ?
1288 (ms - srp->header.duration) : 0;
d6b10348 1289 if (0 != result) {
1da177e4
LT		 1290 struct scsi_sense_hdr sshdr;
1291
d6b10348
MC		 1292 srp->header.status = 0xff & result;
1293 srp->header.masked_status = status_byte(result);
1294 srp->header.msg_status = msg_byte(result);
1295 srp->header.host_status = host_byte(result);
1296 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1297 if ((sdp->sgdebug > 0) &&
1298 ((CHECK_CONDITION == srp->header.masked_status) ||
1299 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1300 __scsi_print_sense("sg_cmd_done", sense,
1301 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1302
1303 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1304 if (driver_byte(result) != 0
1305 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1306 && !scsi_sense_is_deferred(&sshdr)
1307 && sshdr.sense_key == UNIT_ATTENTION
1308 && sdp->device->removable) {
1309 /* Detected possible disc change. Set the bit - this */
1310 /* may be used if there are filesystems using this device */
1311 sdp->device->changed = 1;
1312 }
1313 }
1314 /* Rely on write phase to clean out srp status values, so no "else" */
1315
c6517b79
TB		 1316 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1317 if (unlikely(srp->orphan)) {
1da177e4
LT		 1318 if (sfp->keep_orphan)
1319 srp->sg_io_owned = 0;
c6517b79
TB		 1320 else
1321 done = 0;
1da177e4 1322 }
c6517b79
TB		 1323 srp->done = done;
1324 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1325
1326 if (likely(done)) {
1327 /* Now wake up any sg_read() that is waiting for this
1328 * packet.
1329 */
1da177e4 1330 wake_up_interruptible(&sfp->read_wait);
c6517b79 1331 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
c96952ed 1332 kref_put(&sfp->f_ref, sg_remove_sfp);
015640ed
FT		 1333 } else {
1334 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1335 schedule_work(&srp->ew.work);
1336 }
1da177e4
LT		 1337}
1338
828c0950 1339static const struct file_operations sg_fops = {
1da177e4
LT		 1340 .owner = THIS_MODULE,
1341 .read = sg_read,
1342 .write = sg_write,
1343 .poll = sg_poll,
37b9d1e0 1344 .unlocked_ioctl = sg_ioctl,
1da177e4
LT		 1345#ifdef CONFIG_COMPAT
1346 .compat_ioctl = sg_compat_ioctl,
1347#endif
1348 .open = sg_open,
1349 .mmap = sg_mmap,
1350 .release = sg_release,
1351 .fasync = sg_fasync,
6038f373 1352 .llseek = no_llseek,
1da177e4
LT		 1353};
1354
d253878b 1355static struct class *sg_sysfs_class;
1da177e4
LT		 1356
1357static int sg_sysfs_valid = 0;
1358
7c07d613 1359static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1360{
d6b10348 1361 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1362 Sg_device *sdp;
1363 unsigned long iflags;
7c07d613
JB		 1364 int error;
1365 u32 k;
1da177e4 1366
24669f75 1367 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1368 if (!sdp) {
1369 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1370 return ERR_PTR(-ENOMEM);
1371 }
c6517b79 1372
b98c52b5 1373 idr_preload(GFP_KERNEL);
7c07d613 1374 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4 1375
b98c52b5
TH		 1376 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1377 if (error < 0) {
1378 if (error == -ENOSPC) {
1379 sdev_printk(KERN_WARNING, scsidp,
1380 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1381 scsidp->type, SG_MAX_DEVS - 1);
1382 error = -ENODEV;
1383 } else {
1384 printk(KERN_WARNING
1385 "idr allocation Sg_device failure: %d\n", error);
1386 }
1387 goto out_unlock;
1da177e4 1388 }
b98c52b5 1389 k = error;
1da177e4 1390
1da177e4
LT		 1391 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1392 sprintf(disk->disk_name, "sg%d", k);
1393 disk->first_minor = k;
1394 sdp->disk = disk;
1395 sdp->device = scsidp;
3442f802 1396 INIT_LIST_HEAD(&sdp->sfds);
15b06f9a 1397 init_rwsem(&sdp->o_sem);
8a78362c 1398 sdp->sg_tablesize = queue_max_segments(q);
7c07d613 1399 sdp->index = k;
c6517b79 1400 kref_init(&sdp->d_ref);
b98c52b5 1401 error = 0;
c6517b79 1402
b98c52b5 1403out_unlock:
c6517b79 1404 write_unlock_irqrestore(&sg_index_lock, iflags);
b98c52b5 1405 idr_preload_end();
1da177e4 1406
7c07d613 1407 if (error) {
1da177e4 1408 kfree(sdp);
7c07d613
JB		 1409 return ERR_PTR(error);
1410 }
1411 return sdp;
1da177e4
LT		 1412}
1413
1414static int
ee959b00 1415sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1416{
ee959b00 1417 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1418 struct gendisk *disk;
1419 Sg_device *sdp = NULL;
1420 struct cdev * cdev = NULL;
7c07d613 1421 int error;
454e8957 1422 unsigned long iflags;
1da177e4
LT		 1423
1424 disk = alloc_disk(1);
1425 if (!disk) {
1426 printk(KERN_WARNING "alloc_disk failed\n");
1427 return -ENOMEM;
1428 }
1429 disk->major = SCSI_GENERIC_MAJOR;
1430
1431 error = -ENOMEM;
1432 cdev = cdev_alloc();
1433 if (!cdev) {
1434 printk(KERN_WARNING "cdev_alloc failed\n");
1435 goto out;
1436 }
1437 cdev->owner = THIS_MODULE;
1438 cdev->ops = &sg_fops;
1439
7c07d613
JB		 1440 sdp = sg_alloc(disk, scsidp);
1441 if (IS_ERR(sdp)) {
1da177e4 1442 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1443 error = PTR_ERR(sdp);
1da177e4
LT		 1444 goto out;
1445 }
1da177e4 1446
7c07d613 1447 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1448 if (error)
454e8957 1449 goto cdev_add_err;
5e3c34c1 1450
1da177e4
LT		 1451 sdp->cdev = cdev;
1452 if (sg_sysfs_valid) {
ee959b00 1453 struct device *sg_class_member;
1da177e4 1454
d73a1a67
GKH		 1455 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1456 MKDEV(SCSI_GENERIC_MAJOR,
1457 sdp->index),
1458 sdp, "%s", disk->disk_name);
d07e0361
FT		 1459 if (IS_ERR(sg_class_member)) {
1460 printk(KERN_ERR "sg_add: "
ee959b00 1461 "device_create failed\n");
d07e0361
FT		 1462 error = PTR_ERR(sg_class_member);
1463 goto cdev_add_err;
1464 }
d07e0361 1465 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1466 &sg_class_member->kobj, "generic");
1467 if (error)
1468 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1469 "'generic' back to sg%d\n", sdp->index);
1da177e4 1470 } else
7c07d613 1471 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1472
9ccfc756 1473 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1474 "Attached scsi generic sg%d type %d\n", sdp->index,
1475 scsidp->type);
1da177e4 1476
ee959b00 1477 dev_set_drvdata(cl_dev, sdp);
a24484f2 1478
1da177e4
LT		 1479 return 0;
1480
454e8957 1481cdev_add_err:
7c07d613
JB		 1482 write_lock_irqsave(&sg_index_lock, iflags);
1483 idr_remove(&sg_index_idr, sdp->index);
1484 write_unlock_irqrestore(&sg_index_lock, iflags);
1485 kfree(sdp);
454e8957 1486
1da177e4
LT		 1487out:
1488 put_disk(disk);
1489 if (cdev)
1490 cdev_del(cdev);
1491 return error;
1492}
1493
c6517b79
TB		 1494static void sg_device_destroy(struct kref *kref)
1495{
1496 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1497 unsigned long flags;
1498
1499 /* CAUTION! Note that the device can still be found via idr_find()
1500 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1501 * any other cleanup.
1502 */
1503
1504 write_lock_irqsave(&sg_index_lock, flags);
1505 idr_remove(&sg_index_idr, sdp->index);
1506 write_unlock_irqrestore(&sg_index_lock, flags);
1507
1508 SCSI_LOG_TIMEOUT(3,
1509 printk("sg_device_destroy: %s\n",
1510 sdp->disk->disk_name));
1511
1512 put_disk(sdp->disk);
1513 kfree(sdp);
1514}
1515
1516static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1517{
ee959b00
TJ		 1518 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1519 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1520 unsigned long iflags;
1521 Sg_fd *sfp;
1da177e4 1522
c6517b79 1523 if (!sdp || sdp->detached)
1da177e4 1524 return;
7c07d613 1525
c6517b79
TB		 1526 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1527
1528 /* Need a write lock to set sdp->detached. */
7c07d613 1529 write_lock_irqsave(&sg_index_lock, iflags);
c6517b79 1530 sdp->detached = 1;
3442f802 1531 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
c6517b79
TB		 1532 wake_up_interruptible(&sfp->read_wait);
1533 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
7c07d613
JB		 1534 }
1535 write_unlock_irqrestore(&sg_index_lock, iflags);
1536
1537 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1538 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1539 cdev_del(sdp->cdev);
1540 sdp->cdev = NULL;
1da177e4 1541
c6517b79 1542 sg_put_dev(sdp);
1da177e4
LT		 1543}
1544
6460e75a
DG		 1545module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1546module_param_named(def_reserved_size, def_reserved_size, int,
1547 S_IRUGO | S_IWUSR);
1da177e4
LT		 1548module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1549
1550MODULE_AUTHOR("Douglas Gilbert");
1551MODULE_DESCRIPTION("SCSI generic (sg) driver");
1552MODULE_LICENSE("GPL");
1553MODULE_VERSION(SG_VERSION_STR);
f018fa55 1554MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1555
6460e75a
DG		 1556MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1557 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1558MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1559MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1560
1561static int __init
1562init_sg(void)
1563{
1564 int rc;
1565
6460e75a
DG		 1566 if (scatter_elem_sz < PAGE_SIZE) {
1567 scatter_elem_sz = PAGE_SIZE;
1568 scatter_elem_sz_prev = scatter_elem_sz;
1569 }
1da177e4
LT		 1570 if (def_reserved_size >= 0)
1571 sg_big_buff = def_reserved_size;
6460e75a
DG		 1572 else
1573 def_reserved_size = sg_big_buff;
1da177e4
LT		 1574
1575 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1576 SG_MAX_DEVS, "sg");
1577 if (rc)
1578 return rc;
d253878b 1579 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1580 if ( IS_ERR(sg_sysfs_class) ) {
1581 rc = PTR_ERR(sg_sysfs_class);
1582 goto err_out;
1583 }
1584 sg_sysfs_valid = 1;
1585 rc = scsi_register_interface(&sg_interface);
1586 if (0 == rc) {
1587#ifdef CONFIG_SCSI_PROC_FS
1588 sg_proc_init();
1589#endif /* CONFIG_SCSI_PROC_FS */
1590 return 0;
1591 }
d253878b 1592 class_destroy(sg_sysfs_class);
1da177e4
LT		 1593err_out:
1594 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1595 return rc;
1596}
1597
1598static void __exit
1599exit_sg(void)
1600{
1601#ifdef CONFIG_SCSI_PROC_FS
1602 sg_proc_cleanup();
1603#endif /* CONFIG_SCSI_PROC_FS */
1604 scsi_unregister_interface(&sg_interface);
d253878b 1605 class_destroy(sg_sysfs_class);
1da177e4
LT		 1606 sg_sysfs_valid = 0;
1607 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1608 SG_MAX_DEVS);
7c07d613 1609 idr_destroy(&sg_index_idr);
1da177e4
LT		 1610}
1611
44c7b0ea 1612static int sg_start_req(Sg_request *srp, unsigned char *cmd)
10865dfa 1613{
626710c9 1614 int res;
10865dfa 1615 struct request *rq;
44c7b0ea
FT		 1616 Sg_fd *sfp = srp->parentfp;
1617 sg_io_hdr_t *hp = &srp->header;
1618 int dxfer_len = (int) hp->dxfer_len;
1619 int dxfer_dir = hp->dxfer_direction;
626710c9 1620 unsigned int iov_count = hp->iovec_count;
44c7b0ea
FT		 1621 Sg_scatter_hold *req_schp = &srp->data;
1622 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1623 struct request_queue *q = sfp->parentdp->device->request_queue;
626710c9 1624 struct rq_map_data *md, map_data;
10865dfa
FT		 1625 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1626
44c7b0ea
FT		 1627 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1628 dxfer_len));
1629
10865dfa
FT		 1630 rq = blk_get_request(q, rw, GFP_ATOMIC);
1631 if (!rq)
1632 return -ENOMEM;
1633
1634 memcpy(rq->cmd, cmd, hp->cmd_len);
1635
1636 rq->cmd_len = hp->cmd_len;
1637 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1638
1639 srp->rq = rq;
1640 rq->end_io_data = srp;
1641 rq->sense = srp->sense_b;
1642 rq->retries = SG_DEFAULT_RETRIES;
1643
1da177e4 1644 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1645 return 0;
10865dfa 1646
626710c9
FT		 1647 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1648 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1649 !sfp->parentdp->device->host->unchecked_isa_dma &&
2610a254 1650 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
626710c9
FT		 1651 md = NULL;
1652 else
1653 md = &map_data;
1654
1655 if (md) {
1656 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1657 sg_link_reserve(sfp, srp, dxfer_len);
1658 else {
1659 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1660 if (res)
1661 return res;
1662 }
7e56cb0f 1663
626710c9
FT		 1664 md->pages = req_schp->pages;
1665 md->page_order = req_schp->page_order;
1666 md->nr_entries = req_schp->k_use_sg;
56c451f4 1667 md->offset = 0;
97ae77a1 1668 md->null_mapped = hp->dxferp ? 0 : 1;
ecb554a8
FT		 1669 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1670 md->from_user = 1;
1671 else
1672 md->from_user = 0;
626710c9
FT		 1673 }
1674
0fdf96b6
FT		 1675 if (iov_count) {
1676 int len, size = sizeof(struct sg_iovec) * iov_count;
1677 struct iovec *iov;
1678
3094141c
JL		 1679 iov = memdup_user(hp->dxferp, size);
1680 if (IS_ERR(iov))
1681 return PTR_ERR(iov);
0fdf96b6
FT		 1682
1683 len = iov_length(iov, iov_count);
1684 if (hp->dxfer_len < len) {
1685 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1686 len = hp->dxfer_len;
1687 }
1688
1689 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1690 iov_count,
1691 len, GFP_ATOMIC);
1692 kfree(iov);
1693 } else
626710c9
FT		 1694 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1695 hp->dxfer_len, GFP_ATOMIC);
10db10d1
FT		 1696
1697 if (!res) {
626710c9 1698 srp->bio = rq->bio;
10db10d1 1699
626710c9
FT		 1700 if (!md) {
1701 req_schp->dio_in_use = 1;
1702 hp->info |= SG_INFO_DIRECT_IO;
1703 }
1704 }
10db10d1 1705 return res;
1da177e4
LT		 1706}
1707
e7ee4cc0 1708static int sg_finish_rem_req(Sg_request * srp)
1da177e4 1709{
e7ee4cc0
FT		 1710 int ret = 0;
1711
1da177e4
LT		 1712 Sg_fd *sfp = srp->parentfp;
1713 Sg_scatter_hold *req_schp = &srp->data;
1714
1715 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
6e5a30cb
FT		 1716 if (srp->rq) {
1717 if (srp->bio)
e7ee4cc0 1718 ret = blk_rq_unmap_user(srp->bio);
10db10d1 1719
10865dfa 1720 blk_put_request(srp->rq);
6e5a30cb 1721 }
10865dfa 1722
e27168f8
CS		 1723 if (srp->res_used)
1724 sg_unlink_reserve(sfp, srp);
1725 else
1726 sg_remove_scat(req_schp);
1727
1da177e4 1728 sg_remove_request(sfp, srp);
e7ee4cc0
FT		 1729
1730 return ret;
1da177e4
LT		 1731}
1732
1733static int
1734sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1735{
10db10d1 1736 int sg_bufflen = tablesize * sizeof(struct page *);
2d20eaf9 1737 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1738
10db10d1
FT		 1739 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1740 if (!schp->pages)
1da177e4 1741 return -ENOMEM;
1da177e4 1742 schp->sglist_len = sg_bufflen;
d6b10348 1743 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1744}
1745
1da177e4
LT		 1746static int
1747sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1748{
10db10d1 1749 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1750 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1751 int blk_size = buff_size, order;
1752 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4 1753
fb119935 1754 if (blk_size < 0)
1da177e4
LT		 1755 return -EFAULT;
1756 if (0 == blk_size)
1757 ++blk_size; /* don't know why */
b2ed6c69
FT		 1758 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1759 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1da177e4
LT		 1760 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1761 buff_size, blk_size));
d6b10348
MC		 1762
1763 /* N.B. ret_sz carried into this block ... */
1764 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1765 if (mx_sc_elems < 0)
1766 return mx_sc_elems; /* most likely -ENOMEM */
1767
6460e75a
DG		 1768 num = scatter_elem_sz;
1769 if (unlikely(num != scatter_elem_sz_prev)) {
1770 if (num < PAGE_SIZE) {
1771 scatter_elem_sz = PAGE_SIZE;
1772 scatter_elem_sz_prev = PAGE_SIZE;
1773 } else
1774 scatter_elem_sz_prev = num;
1775 }
10db10d1
FT		 1776
1777 if (sfp->low_dma)
1778 gfp_mask |= GFP_DMA;
1779
1780 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1781 gfp_mask |= __GFP_ZERO;
1782
1783 order = get_order(num);
1784retry:
1785 ret_sz = 1 << (PAGE_SHIFT + order);
1786
1787 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1788 k++, rem_sz -= ret_sz) {
1789
6460e75a 1790 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1791 scatter_elem_sz_prev : rem_sz;
1792
1793 schp->pages[k] = alloc_pages(gfp_mask, order);
1794 if (!schp->pages[k])
1795 goto out;
d6b10348 1796
6460e75a
DG		 1797 if (num == scatter_elem_sz_prev) {
1798 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1799 scatter_elem_sz = ret_sz;
1800 scatter_elem_sz_prev = ret_sz;
1801 }
1802 }
d6b10348 1803
7ca63cb4
DG		 1804 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1805 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1806 } /* end of for loop */
1807
10db10d1 1808 schp->page_order = order;
d6b10348 1809 schp->k_use_sg = k;
7ca63cb4
DG		 1810 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1811 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1812
1813 schp->bufflen = blk_size;
1814 if (rem_sz > 0) /* must have failed */
1815 return -ENOMEM;
1da177e4 1816 return 0;
10db10d1
FT		 1817out:
1818 for (i = 0; i < k; i++)
e71044ee 1819 __free_pages(schp->pages[i], order);
10db10d1
FT		 1820
1821 if (--order >= 0)
1822 goto retry;
1823
1824 return -ENOMEM;
1da177e4
LT		 1825}
1826
1da177e4
LT		 1827static void
1828sg_remove_scat(Sg_scatter_hold * schp)
1829{
1830 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1831 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1832 if (!schp->dio_in_use) {
1da177e4
LT		 1833 int k;
1834
10db10d1 1835 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1da177e4 1836 SCSI_LOG_TIMEOUT(5, printk(
10db10d1
FT		 1837 "sg_remove_scat: k=%d, pg=0x%p\n",
1838 k, schp->pages[k]));
1839 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1840 }
6e5a30cb 1841
10db10d1 1842 kfree(schp->pages);
1da177e4 1843 }
d6b10348 1844 }
1da177e4
LT		 1845 memset(schp, 0, sizeof (*schp));
1846}
1847
1da177e4
LT		 1848static int
1849sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1850{
1851 Sg_scatter_hold *schp = &srp->data;
d6b10348 1852 int k, num;
1da177e4
LT		 1853
1854 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1855 num_read_xfer));
1856 if ((!outp) || (num_read_xfer <= 0))
1857 return 0;
d6b10348 1858
10db10d1
FT		 1859 num = 1 << (PAGE_SHIFT + schp->page_order);
1860 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1861 if (num > num_read_xfer) {
10db10d1 1862 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1863 num_read_xfer))
1864 return -EFAULT;
1865 break;
1866 } else {
10db10d1 1867 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1868 num))
1869 return -EFAULT;
1870 num_read_xfer -= num;
1871 if (num_read_xfer <= 0)
1da177e4 1872 break;
d6b10348 1873 outp += num;
1da177e4 1874 }
1da177e4 1875 }
d6b10348 1876
1da177e4
LT		 1877 return 0;
1878}
1879
1880static void
1881sg_build_reserve(Sg_fd * sfp, int req_size)
1882{
1883 Sg_scatter_hold *schp = &sfp->reserve;
1884
1885 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1886 do {
1887 if (req_size < PAGE_SIZE)
1888 req_size = PAGE_SIZE;
1889 if (0 == sg_build_indirect(schp, sfp, req_size))
1890 return;
1891 else
1892 sg_remove_scat(schp);
1893 req_size >>= 1; /* divide by 2 */
1894 } while (req_size > (PAGE_SIZE / 2));
1895}
1896
1897static void
1898sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1899{
1900 Sg_scatter_hold *req_schp = &srp->data;
1901 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 1902 int k, num, rem;
1da177e4
LT		 1903
1904 srp->res_used = 1;
1905 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 1906 rem = size;
d6b10348 1907
10db10d1
FT		 1908 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1909 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 1910 if (rem <= num) {
d6b10348
MC		 1911 req_schp->k_use_sg = k + 1;
1912 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 1913 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 1914
1915 req_schp->bufflen = size;
10db10d1 1916 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 1917 break;
1918 } else
1919 rem -= num;
1da177e4 1920 }
d6b10348
MC		 1921
1922 if (k >= rsv_schp->k_use_sg)
1923 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 1924}
1925
1926static void
1927sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1928{
1929 Sg_scatter_hold *req_schp = &srp->data;
1da177e4
LT		 1930
1931 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1932 (int) req_schp->k_use_sg));
1da177e4
LT		 1933 req_schp->k_use_sg = 0;
1934 req_schp->bufflen = 0;
10db10d1
FT		 1935 req_schp->pages = NULL;
1936 req_schp->page_order = 0;
1da177e4
LT		 1937 req_schp->sglist_len = 0;
1938 sfp->save_scat_len = 0;
1939 srp->res_used = 0;
1940}
1941
1942static Sg_request *
1943sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1944{
1945 Sg_request *resp;
1946 unsigned long iflags;
1947
1948 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1949 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1950 /* look for requests that are ready + not SG_IO owned */
1951 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1952 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1953 resp->done = 2; /* guard against other readers */
1954 break;
1955 }
1956 }
1957 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1958 return resp;
1959}
1960
1da177e4
LT		 1961/* always adds to end of list */
1962static Sg_request *
1963sg_add_request(Sg_fd * sfp)
1964{
1965 int k;
1966 unsigned long iflags;
1967 Sg_request *resp;
1968 Sg_request *rp = sfp->req_arr;
1969
1970 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1971 resp = sfp->headrp;
1972 if (!resp) {
1973 memset(rp, 0, sizeof (Sg_request));
1974 rp->parentfp = sfp;
1975 resp = rp;
1976 sfp->headrp = resp;
1977 } else {
1978 if (0 == sfp->cmd_q)
1979 resp = NULL; /* command queuing disallowed */
1980 else {
1981 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
1982 if (!rp->parentfp)
1983 break;
1984 }
1985 if (k < SG_MAX_QUEUE) {
1986 memset(rp, 0, sizeof (Sg_request));
1987 rp->parentfp = sfp;
1988 while (resp->nextrp)
1989 resp = resp->nextrp;
1990 resp->nextrp = rp;
1991 resp = rp;
1992 } else
1993 resp = NULL;
1994 }
1995 }
1996 if (resp) {
1997 resp->nextrp = NULL;
cb59e840 1998 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 1999 }
2000 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2001 return resp;
2002}
2003
2004/* Return of 1 for found; 0 for not found */
2005static int
2006sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2007{
2008 Sg_request *prev_rp;
2009 Sg_request *rp;
2010 unsigned long iflags;
2011 int res = 0;
2012
2013 if ((!sfp) || (!srp) || (!sfp->headrp))
2014 return res;
2015 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2016 prev_rp = sfp->headrp;
2017 if (srp == prev_rp) {
2018 sfp->headrp = prev_rp->nextrp;
2019 prev_rp->parentfp = NULL;
2020 res = 1;
2021 } else {
2022 while ((rp = prev_rp->nextrp)) {
2023 if (srp == rp) {
2024 prev_rp->nextrp = rp->nextrp;
2025 rp->parentfp = NULL;
2026 res = 1;
2027 break;
2028 }
2029 prev_rp = rp;
2030 }
2031 }
2032 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2033 return res;
2034}
2035
1da177e4
LT		 2036static Sg_fd *
2037sg_add_sfp(Sg_device * sdp, int dev)
2038{
2039 Sg_fd *sfp;
2040 unsigned long iflags;
44ec9542 2041 int bufflen;
1da177e4 2042
d6b10348 2043 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4 2044 if (!sfp)
e32c9e63 2045 return ERR_PTR(-ENOMEM);
d6b10348 2046
1da177e4
LT		 2047 init_waitqueue_head(&sfp->read_wait);
2048 rwlock_init(&sfp->rq_list_lock);
2049
c6517b79 2050 kref_init(&sfp->f_ref);
1da177e4
LT		 2051 sfp->timeout = SG_DEFAULT_TIMEOUT;
2052 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2053 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2054 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2055 sdp->device->host->unchecked_isa_dma : 1;
2056 sfp->cmd_q = SG_DEF_COMMAND_Q;
2057 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2058 sfp->parentdp = sdp;
c0d3b9c2 2059 write_lock_irqsave(&sg_index_lock, iflags);
e32c9e63 2060 if (sdp->detached) {
c0d3b9c2 2061 write_unlock_irqrestore(&sg_index_lock, iflags);
e32c9e63
VC		 2062 return ERR_PTR(-ENODEV);
2063 }
3442f802 2064 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
c0d3b9c2 2065 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2066 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2067 if (unlikely(sg_big_buff != def_reserved_size))
2068 sg_big_buff = def_reserved_size;
2069
44ec9542 2070 bufflen = min_t(int, sg_big_buff,
ae03bf63 2071 queue_max_sectors(sdp->device->request_queue) * 512);
44ec9542 2072 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2073 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2074 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
c6517b79
TB		 2075
2076 kref_get(&sdp->d_ref);
2077 __module_get(THIS_MODULE);
1da177e4
LT		 2078 return sfp;
2079}
2080
c6517b79 2081static void sg_remove_sfp_usercontext(struct work_struct *work)
1da177e4 2082{
c6517b79
TB		 2083 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2084 struct sg_device *sdp = sfp->parentdp;
2085
2086 /* Cleanup any responses which were never read(). */
2087 while (sfp->headrp)
2088 sg_finish_rem_req(sfp->headrp);
1da177e4 2089
1da177e4 2090 if (sfp->reserve.bufflen > 0) {
c6517b79
TB		 2091 SCSI_LOG_TIMEOUT(6,
2092 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2093 (int) sfp->reserve.bufflen,
2094 (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2095 sg_remove_scat(&sfp->reserve);
2096 }
c6517b79
TB		 2097
2098 SCSI_LOG_TIMEOUT(6,
2099 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2100 sdp->disk->disk_name,
2101 sfp));
d6b10348 2102 kfree(sfp);
c6517b79
TB		 2103
2104 scsi_device_put(sdp->device);
2105 sg_put_dev(sdp);
2106 module_put(THIS_MODULE);
1da177e4
LT		 2107}
2108
c6517b79 2109static void sg_remove_sfp(struct kref *kref)
1da177e4 2110{
c6517b79 2111 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
c6517b79 2112 unsigned long iflags;
1da177e4 2113
c0d3b9c2 2114 write_lock_irqsave(&sg_index_lock, iflags);
3442f802 2115 list_del(&sfp->sfd_siblings);
c0d3b9c2 2116 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2117
015640ed
FT		 2118 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2119 schedule_work(&sfp->ew.work);
1da177e4
LT		 2120}
2121
2122static int
2123sg_res_in_use(Sg_fd * sfp)
2124{
2125 const Sg_request *srp;
2126 unsigned long iflags;
2127
2128 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2129 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2130 if (srp->res_used)
2131 break;
2132 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2133 return srp ? 1 : 0;
2134}
2135
1da177e4 2136#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2137static int
2138sg_idr_max_id(int id, void *p, void *data)
2139{
2140 int *k = data;
2141
2142 if (*k < id)
2143 *k = id;
2144
2145 return 0;
2146}
2147
1da177e4
LT		 2148static int
2149sg_last_dev(void)
2150{
53474c04 2151 int k = -1;
1da177e4
LT		 2152 unsigned long iflags;
2153
7c07d613
JB		 2154 read_lock_irqsave(&sg_index_lock, iflags);
2155 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2156 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2157 return k + 1; /* origin 1 */
2158}
2159#endif
2160
c6517b79
TB		 2161/* must be called with sg_index_lock held */
2162static Sg_device *sg_lookup_dev(int dev)
1da177e4 2163{
c6517b79
TB		 2164 return idr_find(&sg_index_idr, dev);
2165}
1da177e4 2166
c6517b79
TB		 2167static Sg_device *sg_get_dev(int dev)
2168{
2169 struct sg_device *sdp;
2170 unsigned long flags;
2171
2172 read_lock_irqsave(&sg_index_lock, flags);
2173 sdp = sg_lookup_dev(dev);
2174 if (!sdp)
2175 sdp = ERR_PTR(-ENXIO);
2176 else if (sdp->detached) {
2177 /* If sdp->detached, then the refcount may already be 0, in
2178 * which case it would be a bug to do kref_get().
2179 */
2180 sdp = ERR_PTR(-ENODEV);
2181 } else
2182 kref_get(&sdp->d_ref);
2183 read_unlock_irqrestore(&sg_index_lock, flags);
7c07d613 2184
1da177e4
LT		 2185 return sdp;
2186}
2187
c6517b79
TB		 2188static void sg_put_dev(struct sg_device *sdp)
2189{
2190 kref_put(&sdp->d_ref, sg_device_destroy);
2191}
2192
1da177e4
LT		 2193#ifdef CONFIG_SCSI_PROC_FS
2194
2195static struct proc_dir_entry *sg_proc_sgp = NULL;
2196
2197static char sg_proc_sg_dirname[] = "scsi/sg";
2198
2199static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2200
2201static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2202static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2203 size_t count, loff_t *off);
828c0950
AD		 2204static const struct file_operations adio_fops = {
2205 .owner = THIS_MODULE,
1da177e4 2206 .open = sg_proc_single_open_adio,
828c0950
AD		 2207 .read = seq_read,
2208 .llseek = seq_lseek,
1da177e4
LT		 2209 .write = sg_proc_write_adio,
2210 .release = single_release,
2211};
2212
2213static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2214static ssize_t sg_proc_write_dressz(struct file *filp,
2215 const char __user *buffer, size_t count, loff_t *off);
828c0950
AD		 2216static const struct file_operations dressz_fops = {
2217 .owner = THIS_MODULE,
1da177e4 2218 .open = sg_proc_single_open_dressz,
828c0950
AD		 2219 .read = seq_read,
2220 .llseek = seq_lseek,
1da177e4
LT		 2221 .write = sg_proc_write_dressz,
2222 .release = single_release,
2223};
2224
2225static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2226static int sg_proc_single_open_version(struct inode *inode, struct file *file);
828c0950
AD		 2227static const struct file_operations version_fops = {
2228 .owner = THIS_MODULE,
1da177e4 2229 .open = sg_proc_single_open_version,
828c0950
AD		 2230 .read = seq_read,
2231 .llseek = seq_lseek,
1da177e4
LT		 2232 .release = single_release,
2233};
2234
2235static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2236static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
828c0950
AD		 2237static const struct file_operations devhdr_fops = {
2238 .owner = THIS_MODULE,
1da177e4 2239 .open = sg_proc_single_open_devhdr,
828c0950
AD		 2240 .read = seq_read,
2241 .llseek = seq_lseek,
1da177e4
LT		 2242 .release = single_release,
2243};
2244
2245static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2246static int sg_proc_open_dev(struct inode *inode, struct file *file);
2247static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2248static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2249static void dev_seq_stop(struct seq_file *s, void *v);
828c0950
AD		 2250static const struct file_operations dev_fops = {
2251 .owner = THIS_MODULE,
1da177e4 2252 .open = sg_proc_open_dev,
828c0950
AD		 2253 .read = seq_read,
2254 .llseek = seq_lseek,
1da177e4
LT		 2255 .release = seq_release,
2256};
88e9d34c 2257static const struct seq_operations dev_seq_ops = {
1da177e4
LT		 2258 .start = dev_seq_start,
2259 .next = dev_seq_next,
2260 .stop = dev_seq_stop,
2261 .show = sg_proc_seq_show_dev,
2262};
2263
2264static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2265static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
828c0950
AD		 2266static const struct file_operations devstrs_fops = {
2267 .owner = THIS_MODULE,
1da177e4 2268 .open = sg_proc_open_devstrs,
828c0950
AD		 2269 .read = seq_read,
2270 .llseek = seq_lseek,
1da177e4
LT		 2271 .release = seq_release,
2272};
88e9d34c 2273static const struct seq_operations devstrs_seq_ops = {
1da177e4
LT		 2274 .start = dev_seq_start,
2275 .next = dev_seq_next,
2276 .stop = dev_seq_stop,
2277 .show = sg_proc_seq_show_devstrs,
2278};
2279
2280static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2281static int sg_proc_open_debug(struct inode *inode, struct file *file);
828c0950
AD		 2282static const struct file_operations debug_fops = {
2283 .owner = THIS_MODULE,
1da177e4 2284 .open = sg_proc_open_debug,
828c0950
AD		 2285 .read = seq_read,
2286 .llseek = seq_lseek,
1da177e4
LT		 2287 .release = seq_release,
2288};
88e9d34c 2289static const struct seq_operations debug_seq_ops = {
1da177e4
LT		 2290 .start = dev_seq_start,
2291 .next = dev_seq_next,
2292 .stop = dev_seq_stop,
2293 .show = sg_proc_seq_show_debug,
2294};
2295
2296
2297struct sg_proc_leaf {
2298 const char * name;
828c0950 2299 const struct file_operations * fops;
1da177e4
LT		 2300};
2301
18b8ba6c 2302static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
1da177e4
LT		 2303 {"allow_dio", &adio_fops},
2304 {"debug", &debug_fops},
2305 {"def_reserved_size", &dressz_fops},
2306 {"device_hdr", &devhdr_fops},
2307 {"devices", &dev_fops},
2308 {"device_strs", &devstrs_fops},
2309 {"version", &version_fops}
2310};
2311
2312static int
2313sg_proc_init(void)
2314{
6391a113 2315 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
d161a13f 2316 int k;
1da177e4 2317
66600221 2318 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2319 if (!sg_proc_sgp)
2320 return 1;
2321 for (k = 0; k < num_leaves; ++k) {
18b8ba6c 2322 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
d161a13f 2323 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f 2324 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2325 }
2326 return 0;
2327}
2328
2329static void
2330sg_proc_cleanup(void)
2331{
2332 int k;
6391a113 2333 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2334
2335 if (!sg_proc_sgp)
2336 return;
2337 for (k = 0; k < num_leaves; ++k)
2338 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2339 remove_proc_entry(sg_proc_sg_dirname, NULL);
2340}
2341
2342
2343static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2344{
2345 seq_printf(s, "%d\n", *((int *)s->private));
2346 return 0;
2347}
2348
2349static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2350{
2351 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2352}
2353
2354static ssize_t
2355sg_proc_write_adio(struct file *filp, const char __user *buffer,
2356 size_t count, loff_t *off)
2357{
7e95fffe
SB		 2358 int err;
2359 unsigned long num;
1da177e4
LT		 2360
2361 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2362 return -EACCES;
7e95fffe
SB		 2363 err = kstrtoul_from_user(buffer, count, 0, &num);
2364 if (err)
2365 return err;
2366 sg_allow_dio = num ? 1 : 0;
1da177e4
LT		 2367 return count;
2368}
2369
2370static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2371{
2372 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2373}
2374
2375static ssize_t
2376sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2377 size_t count, loff_t *off)
2378{
7e95fffe 2379 int err;
1da177e4 2380 unsigned long k = ULONG_MAX;
1da177e4
LT		 2381
2382 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2383 return -EACCES;
7e95fffe
SB		 2384
2385 err = kstrtoul_from_user(buffer, count, 0, &k);
2386 if (err)
2387 return err;
1da177e4
LT		 2388 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2389 sg_big_buff = k;
2390 return count;
2391 }
2392 return -ERANGE;
2393}
2394
2395static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2396{
2397 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2398 sg_version_date);
2399 return 0;
2400}
2401
2402static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2403{
2404 return single_open(file, sg_proc_seq_show_version, NULL);
2405}
2406
2407static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2408{
2409 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2410 "online\n");
2411 return 0;
2412}
2413
2414static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2415{
2416 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2417}
2418
2419struct sg_proc_deviter {
2420 loff_t index;
2421 size_t max;
2422};
2423
2424static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2425{
2426 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2427
729d70f5 2428 s->private = it;
1da177e4
LT		 2429 if (! it)
2430 return NULL;
729d70f5 2431
1da177e4
LT		 2432 it->index = *pos;
2433 it->max = sg_last_dev();
2434 if (it->index >= it->max)
729d70f5 2435 return NULL;
1da177e4 2436 return it;
1da177e4
LT		 2437}
2438
2439static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2440{
729d70f5 2441 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2442
2443 *pos = ++it->index;
2444 return (it->index < it->max) ? it : NULL;
2445}
2446
2447static void dev_seq_stop(struct seq_file *s, void *v)
2448{
729d70f5 2449 kfree(s->private);
1da177e4
LT		 2450}
2451
2452static int sg_proc_open_dev(struct inode *inode, struct file *file)
2453{
2454 return seq_open(file, &dev_seq_ops);
2455}
2456
2457static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2458{
2459 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2460 Sg_device *sdp;
2461 struct scsi_device *scsidp;
c6517b79 2462 unsigned long iflags;
1da177e4 2463
c6517b79
TB		 2464 read_lock_irqsave(&sg_index_lock, iflags);
2465 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2466 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2467 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2468 scsidp->host->host_no, scsidp->channel,
2469 scsidp->id, scsidp->lun, (int) scsidp->type,
2470 1,
2471 (int) scsidp->queue_depth,
2472 (int) scsidp->device_busy,
2473 (int) scsi_device_online(scsidp));
2474 else
2475 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
c6517b79 2476 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2477 return 0;
2478}
2479
2480static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2481{
2482 return seq_open(file, &devstrs_seq_ops);
2483}
2484
2485static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2486{
2487 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2488 Sg_device *sdp;
2489 struct scsi_device *scsidp;
c6517b79 2490 unsigned long iflags;
1da177e4 2491
c6517b79
TB		 2492 read_lock_irqsave(&sg_index_lock, iflags);
2493 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2494 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2495 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2496 scsidp->vendor, scsidp->model, scsidp->rev);
2497 else
2498 seq_printf(s, "<no active device>\n");
c6517b79 2499 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2500 return 0;
2501}
2502
c0d3b9c2 2503/* must be called while holding sg_index_lock */
1da177e4
LT		 2504static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2505{
2506 int k, m, new_interface, blen, usg;
2507 Sg_request *srp;
2508 Sg_fd *fp;
2509 const sg_io_hdr_t *hp;
2510 const char * cp;
cb59e840 2511 unsigned int ms;
1da177e4 2512
3442f802
FT		 2513 k = 0;
2514 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2515 k++;
c6517b79 2516 read_lock(&fp->rq_list_lock); /* irqs already disabled */
1da177e4 2517 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3442f802 2518 "(res)sgat=%d low_dma=%d\n", k,
1da177e4
LT		 2519 jiffies_to_msecs(fp->timeout),
2520 fp->reserve.bufflen,
2521 (int) fp->reserve.k_use_sg,
2522 (int) fp->low_dma);
ebaf466b 2523 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
1da177e4 2524 (int) fp->cmd_q, (int) fp->force_packid,
ebaf466b 2525 (int) fp->keep_orphan);
c6517b79
TB		 2526 for (m = 0, srp = fp->headrp;
2527 srp != NULL;
2528 ++m, srp = srp->nextrp) {
1da177e4
LT		 2529 hp = &srp->header;
2530 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2531 if (srp->res_used) {
2532 if (new_interface &&
2533 (SG_FLAG_MMAP_IO & hp->flags))
2534 cp = " mmap>> ";
2535 else
2536 cp = " rb>> ";
2537 } else {
2538 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2539 cp = " dio>> ";
2540 else
2541 cp = " ";
2542 }
2543 seq_printf(s, cp);
d6b10348
MC		 2544 blen = srp->data.bufflen;
2545 usg = srp->data.k_use_sg;
1da177e4
LT		 2546 seq_printf(s, srp->done ?
2547 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2548 : "act:");
1da177e4
LT		 2549 seq_printf(s, " id=%d blen=%d",
2550 srp->header.pack_id, blen);
2551 if (srp->done)
2552 seq_printf(s, " dur=%d", hp->duration);
cb59e840 2553 else {
2554 ms = jiffies_to_msecs(jiffies);
1da177e4 2555 seq_printf(s, " t_o/elap=%d/%d",
cb59e840 2556 (new_interface ? hp->timeout :
2557 jiffies_to_msecs(fp->timeout)),
2558 (ms > hp->duration ? ms - hp->duration : 0));
2559 }
1da177e4
LT		 2560 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2561 (int) srp->data.cmd_opcode);
2562 }
2563 if (0 == m)
2564 seq_printf(s, " No requests active\n");
c6517b79 2565 read_unlock(&fp->rq_list_lock);
1da177e4
LT		 2566 }
2567}
2568
2569static int sg_proc_open_debug(struct inode *inode, struct file *file)
2570{
2571 return seq_open(file, &debug_seq_ops);
2572}
2573
2574static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2575{
2576 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2577 Sg_device *sdp;
c6517b79 2578 unsigned long iflags;
1da177e4
LT		 2579
2580 if (it && (0 == it->index)) {
7c07d613
JB		 2581 seq_printf(s, "max_active_device=%d(origin 1)\n",
2582 (int)it->max);
1da177e4
LT		 2583 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2584 }
1da177e4 2585
c6517b79
TB		 2586 read_lock_irqsave(&sg_index_lock, iflags);
2587 sdp = it ? sg_lookup_dev(it->index) : NULL;
c0d3b9c2
JB		 2588 if (sdp && !list_empty(&sdp->sfds)) {
2589 struct scsi_device *scsidp = sdp->device;
1da177e4 2590
c0d3b9c2
JB		 2591 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2592 if (sdp->detached)
2593 seq_printf(s, "detached pending close ");
2594 else
2595 seq_printf
2596 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2597 scsidp->host->host_no,
2598 scsidp->channel, scsidp->id,
2599 scsidp->lun,
2600 scsidp->host->hostt->emulated);
2601 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2602 sdp->sg_tablesize, sdp->exclude);
2603 sg_proc_debug_helper(s, sdp);
1da177e4 2604 }
c6517b79 2605 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2606 return 0;
2607}
2608
2609#endif /* CONFIG_SCSI_PROC_FS */
2610
2611module_init(init_sg);
2612module_exit(exit_sg);
Linux kernel - Deliverables
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