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drm/i915: Keep the CRC values into a circular buffer
[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);
1f962ebc 109static DEFINE_RWLOCK(sg_index_lock);
1da177e4
LT		 110
111static struct class_interface sg_interface = {
ee959b00
TJ		 112 .add_dev = sg_add,
113 .remove_dev = sg_remove,
1da177e4
LT		 114};
115
116typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
117 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 118 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4 119 unsigned bufflen; /* Size of (aggregate) data buffer */
10db10d1
FT		 120 struct page **pages;
121 int page_order;
1da177e4
LT		 122 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
123 unsigned char cmd_opcode; /* first byte of command */
124} Sg_scatter_hold;
125
126struct sg_device; /* forward declarations */
127struct sg_fd;
128
129typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 130 struct sg_request *nextrp; /* NULL -> tail request (slist) */
131 struct sg_fd *parentfp; /* NULL -> not in use */
132 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
133 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 134 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 135 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
136 char orphan; /* 1 -> drop on sight, 0 -> normal */
137 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
6acddc5e
JE		 138 /* done protected by rq_list_lock */
139 char done; /* 0->before bh, 1->before read, 2->read */
10865dfa 140 struct request *rq;
6e5a30cb 141 struct bio *bio;
c96952ed 142 struct execute_work ew;
1da177e4
LT		 143} Sg_request;
144
145typedef struct sg_fd { /* holds the state of a file descriptor */
1f962ebc 146 struct list_head sfd_siblings; /* protected by sfd_lock of device */
1da177e4
LT		 147 struct sg_device *parentdp; /* owning device */
148 wait_queue_head_t read_wait; /* queue read until command done */
149 rwlock_t rq_list_lock; /* protect access to list in req_arr */
150 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
151 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
152 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
153 unsigned save_scat_len; /* original length of trunc. scat. element */
154 Sg_request *headrp; /* head of request slist, NULL->empty */
155 struct fasync_struct *async_qp; /* used by asynchronous notification */
156 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
157 char low_dma; /* as in parent but possibly overridden to 1 */
158 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
1da177e4
LT		 159 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
160 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
161 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
162 char mmap_called; /* 0 -> mmap() never called on this fd */
c6517b79
TB		 163 struct kref f_ref;
164 struct execute_work ew;
1da177e4
LT		 165} Sg_fd;
166
167typedef struct sg_device { /* holds the state of each scsi generic device */
168 struct scsi_device *device;
1da177e4 169 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 170 u32 index; /* device index number */
1f962ebc 171 spinlock_t sfd_lock; /* protect file descriptor list for device */
3442f802 172 struct list_head sfds;
15b06f9a 173 struct rw_semaphore o_sem; /* exclude open should hold this rwsem */
1da177e4 174 volatile char detached; /* 0->attached, 1->detached pending removal */
b499e524 175 char exclude; /* opened for exclusive access */
1da177e4
LT		 176 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
177 struct gendisk *disk;
178 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
c6517b79 179 struct kref d_ref;
1da177e4
LT		 180} Sg_device;
181
d6b10348 182/* tasklet or soft irq callback */
a91a3a20 183static void sg_rq_end_io(struct request *rq, int uptodate);
10865dfa 184static int sg_start_req(Sg_request *srp, unsigned char *cmd);
e7ee4cc0 185static int sg_finish_rem_req(Sg_request * srp);
1da177e4 186static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
1da177e4
LT		 187static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
188 Sg_request * srp);
0b07de85
AG		 189static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
190 const char __user *buf, size_t count, int blocking,
a2dd3b4c 191 int read_only, int sg_io_owned, Sg_request **o_srp);
1da177e4
LT		 192static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
193 unsigned char *cmnd, int timeout, int blocking);
1da177e4
LT		 194static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
195static void sg_remove_scat(Sg_scatter_hold * schp);
196static void sg_build_reserve(Sg_fd * sfp, int req_size);
197static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
198static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
1da177e4 199static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
c6517b79 200static void sg_remove_sfp(struct kref *);
1da177e4
LT		 201static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
202static Sg_request *sg_add_request(Sg_fd * sfp);
203static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
204static int sg_res_in_use(Sg_fd * sfp);
1da177e4 205static Sg_device *sg_get_dev(int dev);
c6517b79 206static void sg_put_dev(Sg_device *sdp);
1da177e4 207
1da177e4
LT		 208#define SZ_SG_HEADER sizeof(struct sg_header)
209#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
210#define SZ_SG_IOVEC sizeof(sg_iovec_t)
211#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
212
14e507b8
FT		 213static int sg_allow_access(struct file *filp, unsigned char *cmd)
214{
35df8397 215 struct sg_fd *sfp = filp->private_data;
14e507b8
FT		 216
217 if (sfp->parentdp->device->type == TYPE_SCANNER)
218 return 0;
219
018e0446 220 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
14e507b8
FT		 221}
222
035d12e6
JE		 223static int sfds_list_empty(Sg_device *sdp)
224{
225 unsigned long flags;
226 int ret;
227
1f962ebc 228 spin_lock_irqsave(&sdp->sfd_lock, flags);
035d12e6 229 ret = list_empty(&sdp->sfds);
1f962ebc 230 spin_unlock_irqrestore(&sdp->sfd_lock, flags);
035d12e6
JE		 231 return ret;
232}
233
1da177e4
LT		 234static int
235sg_open(struct inode *inode, struct file *filp)
236{
237 int dev = iminor(inode);
238 int flags = filp->f_flags;
d6b10348 239 struct request_queue *q;
1da177e4
LT		 240 Sg_device *sdp;
241 Sg_fd *sfp;
1da177e4
LT		 242 int retval;
243
244 nonseekable_open(inode, filp);
245 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
246 sdp = sg_get_dev(dev);
c6517b79
TB		 247 if (IS_ERR(sdp)) {
248 retval = PTR_ERR(sdp);
249 sdp = NULL;
250 goto sg_put;
eb09d3d4 251 }
1da177e4
LT		 252
253 /* This driver's module count bumped by fops_get in <linux/fs.h> */
254 /* Prevent the device driver from vanishing while we sleep */
255 retval = scsi_device_get(sdp->device);
c6517b79
TB		 256 if (retval)
257 goto sg_put;
1da177e4 258
bc4f2401
AS		 259 retval = scsi_autopm_get_device(sdp->device);
260 if (retval)
261 goto sdp_put;
262
1da177e4
LT		 263 if (!((flags & O_NONBLOCK) ||
264 scsi_block_when_processing_errors(sdp->device))) {
265 retval = -ENXIO;
266 /* we are in error recovery for this device */
267 goto error_out;
268 }
269
15b06f9a
VC		 270 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) {
271 retval = -EPERM; /* Can't lock it with read only access */
272 goto error_out;
273 }
274 if (flags & O_NONBLOCK) {
275 if (flags & O_EXCL) {
276 if (!down_write_trylock(&sdp->o_sem)) {
277 retval = -EBUSY;
278 goto error_out;
279 }
280 } else {
281 if (!down_read_trylock(&sdp->o_sem)) {
282 retval = -EBUSY;
283 goto error_out;
284 }
1da177e4 285 }
15b06f9a
VC		 286 } else {
287 if (flags & O_EXCL)
288 down_write(&sdp->o_sem);
289 else
290 down_read(&sdp->o_sem);
1da177e4 291 }
15b06f9a
VC		 292 /* Since write lock is held, no need to check sfd_list */
293 if (flags & O_EXCL)
00b2d9d6 294 sdp->exclude = 1; /* used by release lock */
15b06f9a 295
035d12e6 296 if (sfds_list_empty(sdp)) { /* no existing opens on this device */
1da177e4 297 sdp->sgdebug = 0;
d6b10348 298 q = sdp->device->request_queue;
8a78362c 299 sdp->sg_tablesize = queue_max_segments(q);
1da177e4 300 }
e32c9e63
VC		 301 sfp = sg_add_sfp(sdp, dev);
302 if (!IS_ERR(sfp))
1da177e4 303 filp->private_data = sfp;
15b06f9a
VC		 304 /* retval is already provably zero at this point because of the
305 * check after retval = scsi_autopm_get_device(sdp->device))
306 */
1da177e4 307 else {
e32c9e63
VC		 308 retval = PTR_ERR(sfp);
309
c6517b79 310 if (flags & O_EXCL) {
00b2d9d6 311 sdp->exclude = 0; /* undo if error */
15b06f9a
VC		 312 up_write(&sdp->o_sem);
313 } else
314 up_read(&sdp->o_sem);
c6517b79 315error_out:
bc4f2401
AS		 316 scsi_autopm_put_device(sdp->device);
317sdp_put:
c6517b79 318 scsi_device_put(sdp->device);
bc4f2401 319 }
c6517b79
TB		 320sg_put:
321 if (sdp)
322 sg_put_dev(sdp);
1da177e4
LT		 323 return retval;
324}
325
326/* Following function was formerly called 'sg_close' */
327static int
328sg_release(struct inode *inode, struct file *filp)
329{
330 Sg_device *sdp;
331 Sg_fd *sfp;
15b06f9a 332 int excl;
1da177e4
LT		 333
334 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
335 return -ENXIO;
336 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
c6517b79 337
00b2d9d6
VC		 338 excl = sdp->exclude;
339 sdp->exclude = 0;
15b06f9a
VC		 340 if (excl)
341 up_write(&sdp->o_sem);
342 else
343 up_read(&sdp->o_sem);
c6517b79 344
bc4f2401 345 scsi_autopm_put_device(sdp->device);
c6517b79 346 kref_put(&sfp->f_ref, sg_remove_sfp);
1da177e4
LT		 347 return 0;
348}
349
350static ssize_t
351sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
352{
1da177e4
LT		 353 Sg_device *sdp;
354 Sg_fd *sfp;
355 Sg_request *srp;
356 int req_pack_id = -1;
1da177e4 357 sg_io_hdr_t *hp;
cb59e840 358 struct sg_header *old_hdr = NULL;
359 int retval = 0;
1da177e4
LT		 360
361 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
362 return -ENXIO;
363 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
364 sdp->disk->disk_name, (int) count));
d6b10348 365
1da177e4
LT		 366 if (!access_ok(VERIFY_WRITE, buf, count))
367 return -EFAULT;
368 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840 369 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
370 if (!old_hdr)
371 return -ENOMEM;
372 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
373 retval = -EFAULT;
374 goto free_old_hdr;
375 }
376 if (old_hdr->reply_len < 0) {
1da177e4 377 if (count >= SZ_SG_IO_HDR) {
cb59e840 378 sg_io_hdr_t *new_hdr;
379 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
380 if (!new_hdr) {
381 retval = -ENOMEM;
382 goto free_old_hdr;
383 }
384 retval =__copy_from_user
385 (new_hdr, buf, SZ_SG_IO_HDR);
386 req_pack_id = new_hdr->pack_id;
387 kfree(new_hdr);
388 if (retval) {
389 retval = -EFAULT;
390 goto free_old_hdr;
391 }
1da177e4
LT		 392 }
393 } else
cb59e840 394 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 395 }
396 srp = sg_get_rq_mark(sfp, req_pack_id);
397 if (!srp) { /* now wait on packet to arrive */
cb59e840 398 if (sdp->detached) {
399 retval = -ENODEV;
400 goto free_old_hdr;
401 }
402 if (filp->f_flags & O_NONBLOCK) {
403 retval = -EAGAIN;
404 goto free_old_hdr;
405 }
3f0c6aba 406 retval = wait_event_interruptible(sfp->read_wait,
794c10fa 407 (sdp->detached ||
3f0c6aba 408 (srp = sg_get_rq_mark(sfp, req_pack_id))));
794c10fa
JE		 409 if (sdp->detached) {
410 retval = -ENODEV;
411 goto free_old_hdr;
412 }
413 if (retval) {
cb59e840 414 /* -ERESTARTSYS as signal hit process */
415 goto free_old_hdr;
1da177e4
LT		 416 }
417 }
cb59e840 418 if (srp->header.interface_id != '\0') {
419 retval = sg_new_read(sfp, buf, count, srp);
420 goto free_old_hdr;
421 }
1da177e4
LT		 422
423 hp = &srp->header;
cb59e840 424 if (old_hdr == NULL) {
425 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
426 if (! old_hdr) {
427 retval = -ENOMEM;
428 goto free_old_hdr;
429 }
430 }
431 memset(old_hdr, 0, SZ_SG_HEADER);
432 old_hdr->reply_len = (int) hp->timeout;
433 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
434 old_hdr->pack_id = hp->pack_id;
435 old_hdr->twelve_byte =
1da177e4 436 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840 437 old_hdr->target_status = hp->masked_status;
438 old_hdr->host_status = hp->host_status;
439 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 440 if ((CHECK_CONDITION & hp->masked_status) ||
441 (DRIVER_SENSE & hp->driver_status))
cb59e840 442 memcpy(old_hdr->sense_buffer, srp->sense_b,
443 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 444 switch (hp->host_status) {
445 /* This setup of 'result' is for backward compatibility and is best
446 ignored by the user who should use target, host + driver status */
447 case DID_OK:
448 case DID_PASSTHROUGH:
449 case DID_SOFT_ERROR:
cb59e840 450 old_hdr->result = 0;
1da177e4
LT		 451 break;
452 case DID_NO_CONNECT:
453 case DID_BUS_BUSY:
454 case DID_TIME_OUT:
cb59e840 455 old_hdr->result = EBUSY;
1da177e4
LT		 456 break;
457 case DID_BAD_TARGET:
458 case DID_ABORT:
459 case DID_PARITY:
460 case DID_RESET:
461 case DID_BAD_INTR:
cb59e840 462 old_hdr->result = EIO;
1da177e4
LT		 463 break;
464 case DID_ERROR:
cb59e840 465 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 466 hp->masked_status == GOOD) ? 0 : EIO;
467 break;
468 default:
cb59e840 469 old_hdr->result = EIO;
1da177e4
LT		 470 break;
471 }
472
473 /* Now copy the result back to the user buffer. */
474 if (count >= SZ_SG_HEADER) {
cb59e840 475 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
476 retval = -EFAULT;
477 goto free_old_hdr;
478 }
1da177e4 479 buf += SZ_SG_HEADER;
cb59e840 480 if (count > old_hdr->reply_len)
481 count = old_hdr->reply_len;
1da177e4 482 if (count > SZ_SG_HEADER) {
cb59e840 483 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
484 retval = -EFAULT;
485 goto free_old_hdr;
486 }
1da177e4
LT		 487 }
488 } else
cb59e840 489 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 490 sg_finish_rem_req(srp);
cb59e840 491 retval = count;
492free_old_hdr:
c9475cb0 493 kfree(old_hdr);
cb59e840 494 return retval;
1da177e4
LT		 495}
496
497static ssize_t
498sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
499{
500 sg_io_hdr_t *hp = &srp->header;
501 int err = 0;
502 int len;
503
504 if (count < SZ_SG_IO_HDR) {
505 err = -EINVAL;
506 goto err_out;
507 }
508 hp->sb_len_wr = 0;
509 if ((hp->mx_sb_len > 0) && hp->sbp) {
510 if ((CHECK_CONDITION & hp->masked_status) ||
511 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 512 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 513 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
514 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
515 len = (len > sb_len) ? sb_len : len;
516 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
517 err = -EFAULT;
518 goto err_out;
519 }
520 hp->sb_len_wr = len;
521 }
522 }
523 if (hp->masked_status || hp->host_status || hp->driver_status)
524 hp->info |= SG_INFO_CHECK;
525 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
526 err = -EFAULT;
527 goto err_out;
528 }
0b6cb26c 529err_out:
e7ee4cc0 530 err = sg_finish_rem_req(srp);
1da177e4
LT		 531 return (0 == err) ? count : err;
532}
533
534static ssize_t
535sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
536{
537 int mxsize, cmd_size, k;
538 int input_size, blocking;
539 unsigned char opcode;
540 Sg_device *sdp;
541 Sg_fd *sfp;
542 Sg_request *srp;
543 struct sg_header old_hdr;
544 sg_io_hdr_t *hp;
d6b10348 545 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 546
547 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
548 return -ENXIO;
549 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
550 sdp->disk->disk_name, (int) count));
551 if (sdp->detached)
552 return -ENODEV;
553 if (!((filp->f_flags & O_NONBLOCK) ||
554 scsi_block_when_processing_errors(sdp->device)))
555 return -ENXIO;
556
557 if (!access_ok(VERIFY_READ, buf, count))
558 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
559 if (count < SZ_SG_HEADER)
560 return -EIO;
561 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
562 return -EFAULT;
563 blocking = !(filp->f_flags & O_NONBLOCK);
564 if (old_hdr.reply_len < 0)
a2dd3b4c
TB		 565 return sg_new_write(sfp, filp, buf, count,
566 blocking, 0, 0, NULL);
1da177e4
LT		 567 if (count < (SZ_SG_HEADER + 6))
568 return -EIO; /* The minimum scsi command length is 6 bytes. */
569
570 if (!(srp = sg_add_request(sfp))) {
571 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
572 return -EDOM;
573 }
574 buf += SZ_SG_HEADER;
575 __get_user(opcode, buf);
576 if (sfp->next_cmd_len > 0) {
577 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
578 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
579 sfp->next_cmd_len = 0;
580 sg_remove_request(sfp, srp);
581 return -EIO;
582 }
583 cmd_size = sfp->next_cmd_len;
584 sfp->next_cmd_len = 0; /* reset so only this write() effected */
585 } else {
586 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
587 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
588 cmd_size = 12;
589 }
590 SCSI_LOG_TIMEOUT(4, printk(
591 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
592/* Determine buffer size. */
593 input_size = count - cmd_size;
594 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
595 mxsize -= SZ_SG_HEADER;
596 input_size -= SZ_SG_HEADER;
597 if (input_size < 0) {
598 sg_remove_request(sfp, srp);
599 return -EIO; /* User did not pass enough bytes for this command. */
600 }
601 hp = &srp->header;
602 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
603 hp->cmd_len = (unsigned char) cmd_size;
604 hp->iovec_count = 0;
605 hp->mx_sb_len = 0;
606 if (input_size > 0)
607 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
608 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
609 else
610 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
611 hp->dxfer_len = mxsize;
fad7f01e
FT		 612 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
613 hp->dxferp = (char __user *)buf + cmd_size;
614 else
615 hp->dxferp = NULL;
1da177e4
LT		 616 hp->sbp = NULL;
617 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
618 hp->flags = input_size; /* structure abuse ... */
619 hp->pack_id = old_hdr.pack_id;
620 hp->usr_ptr = NULL;
621 if (__copy_from_user(cmnd, buf, cmd_size))
622 return -EFAULT;
623 /*
624 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
625 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
626 * is a non-zero input_size, so emit a warning.
627 */
eaa3e22e
AK		 628 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
629 static char cmd[TASK_COMM_LEN];
2fe038e3
CD		 630 if (strcmp(current->comm, cmd)) {
631 printk_ratelimited(KERN_WARNING
632 "sg_write: data in/out %d/%d bytes "
633 "for SCSI command 0x%x-- guessing "
634 "data in;\n program %s not setting "
635 "count and/or reply_len properly\n",
636 old_hdr.reply_len - (int)SZ_SG_HEADER,
637 input_size, (unsigned int) cmnd[0],
638 current->comm);
eaa3e22e
AK		 639 strcpy(cmd, current->comm);
640 }
641 }
1da177e4
LT		 642 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
643 return (k < 0) ? k : count;
644}
645
646static ssize_t
0b07de85 647sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
a2dd3b4c 648 size_t count, int blocking, int read_only, int sg_io_owned,
0b07de85 649 Sg_request **o_srp)
1da177e4
LT		 650{
651 int k;
652 Sg_request *srp;
653 sg_io_hdr_t *hp;
d6b10348 654 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 655 int timeout;
656 unsigned long ul_timeout;
657
658 if (count < SZ_SG_IO_HDR)
659 return -EINVAL;
660 if (!access_ok(VERIFY_READ, buf, count))
661 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
662
663 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
664 if (!(srp = sg_add_request(sfp))) {
665 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
666 return -EDOM;
667 }
a2dd3b4c 668 srp->sg_io_owned = sg_io_owned;
1da177e4
LT		 669 hp = &srp->header;
670 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
671 sg_remove_request(sfp, srp);
672 return -EFAULT;
673 }
674 if (hp->interface_id != 'S') {
675 sg_remove_request(sfp, srp);
676 return -ENOSYS;
677 }
678 if (hp->flags & SG_FLAG_MMAP_IO) {
679 if (hp->dxfer_len > sfp->reserve.bufflen) {
680 sg_remove_request(sfp, srp);
681 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
682 }
683 if (hp->flags & SG_FLAG_DIRECT_IO) {
684 sg_remove_request(sfp, srp);
685 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
686 }
687 if (sg_res_in_use(sfp)) {
688 sg_remove_request(sfp, srp);
689 return -EBUSY; /* reserve buffer already being used */
690 }
691 }
692 ul_timeout = msecs_to_jiffies(srp->header.timeout);
693 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
694 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
695 sg_remove_request(sfp, srp);
696 return -EMSGSIZE;
697 }
698 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
699 sg_remove_request(sfp, srp);
700 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
701 }
702 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
703 sg_remove_request(sfp, srp);
704 return -EFAULT;
705 }
14e507b8 706 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 707 sg_remove_request(sfp, srp);
708 return -EPERM;
709 }
710 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
711 if (k < 0)
712 return k;
713 if (o_srp)
714 *o_srp = srp;
715 return count;
716}
717
718static int
719sg_common_write(Sg_fd * sfp, Sg_request * srp,
720 unsigned char *cmnd, int timeout, int blocking)
721{
d6b10348 722 int k, data_dir;
1da177e4
LT		 723 Sg_device *sdp = sfp->parentdp;
724 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 725
726 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
727 hp->status = 0;
728 hp->masked_status = 0;
729 hp->msg_status = 0;
730 hp->info = 0;
731 hp->host_status = 0;
732 hp->driver_status = 0;
733 hp->resid = 0;
734 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
735 (int) cmnd[0], (int) hp->cmd_len));
736
10865dfa
FT		 737 k = sg_start_req(srp, cmnd);
738 if (k) {
7ca63cb4 739 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 740 sg_finish_rem_req(srp);
741 return k; /* probably out of space --> ENOMEM */
742 }
1da177e4 743 if (sdp->detached) {
caf19d38
FT		 744 if (srp->bio)
745 blk_end_request_all(srp->rq, -EIO);
1da177e4
LT		 746 sg_finish_rem_req(srp);
747 return -ENODEV;
748 }
1da177e4 749
1da177e4
LT		 750 switch (hp->dxfer_direction) {
751 case SG_DXFER_TO_FROM_DEV:
752 case SG_DXFER_FROM_DEV:
d6b10348 753 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 754 break;
755 case SG_DXFER_TO_DEV:
d6b10348 756 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 757 break;
758 case SG_DXFER_UNKNOWN:
d6b10348 759 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 760 break;
761 default:
d6b10348 762 data_dir = DMA_NONE;
1da177e4
LT		 763 break;
764 }
cb59e840 765 hp->duration = jiffies_to_msecs(jiffies);
10db10d1
FT		 766
767 srp->rq->timeout = timeout;
c6517b79 768 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
10db10d1
FT		 769 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
770 srp->rq, 1, sg_rq_end_io);
771 return 0;
1da177e4
LT		 772}
773
6acddc5e
JE		 774static int srp_done(Sg_fd *sfp, Sg_request *srp)
775{
776 unsigned long flags;
777 int ret;
778
779 read_lock_irqsave(&sfp->rq_list_lock, flags);
780 ret = srp->done;
781 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
782 return ret;
783}
784
37b9d1e0 785static long
f4927c45 786sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 787{
788 void __user *p = (void __user *)arg;
789 int __user *ip = p;
790 int result, val, read_only;
791 Sg_device *sdp;
792 Sg_fd *sfp;
793 Sg_request *srp;
794 unsigned long iflags;
795
796 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
797 return -ENXIO;
abf54393 798
1da177e4
LT		 799 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
800 sdp->disk->disk_name, (int) cmd_in));
801 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
802
803 switch (cmd_in) {
804 case SG_IO:
dddbf8d9
JE		 805 if (sdp->detached)
806 return -ENODEV;
807 if (!scsi_block_when_processing_errors(sdp->device))
808 return -ENXIO;
809 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
810 return -EFAULT;
811 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
812 1, read_only, 1, &srp);
813 if (result < 0)
814 return result;
3f0c6aba 815 result = wait_event_interruptible(sfp->read_wait,
6acddc5e 816 (srp_done(sfp, srp) || sdp->detached));
794c10fa
JE		 817 if (sdp->detached)
818 return -ENODEV;
819 write_lock_irq(&sfp->rq_list_lock);
820 if (srp->done) {
821 srp->done = 2;
dddbf8d9 822 write_unlock_irq(&sfp->rq_list_lock);
794c10fa
JE		 823 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
824 return (result < 0) ? result : 0;
1da177e4 825 }
794c10fa
JE		 826 srp->orphan = 1;
827 write_unlock_irq(&sfp->rq_list_lock);
828 return result; /* -ERESTARTSYS because signal hit process */
1da177e4
LT		 829 case SG_SET_TIMEOUT:
830 result = get_user(val, ip);
831 if (result)
832 return result;
833 if (val < 0)
834 return -EIO;
835 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
836 val = MULDIV (INT_MAX, USER_HZ, HZ);
837 sfp->timeout_user = val;
838 sfp->timeout = MULDIV (val, HZ, USER_HZ);
839
840 return 0;
841 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
842 /* strange ..., for backward compatibility */
843 return sfp->timeout_user;
844 case SG_SET_FORCE_LOW_DMA:
845 result = get_user(val, ip);
846 if (result)
847 return result;
848 if (val) {
849 sfp->low_dma = 1;
850 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
851 val = (int) sfp->reserve.bufflen;
852 sg_remove_scat(&sfp->reserve);
853 sg_build_reserve(sfp, val);
854 }
855 } else {
856 if (sdp->detached)
857 return -ENODEV;
858 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
859 }
860 return 0;
861 case SG_GET_LOW_DMA:
862 return put_user((int) sfp->low_dma, ip);
863 case SG_GET_SCSI_ID:
864 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
865 return -EFAULT;
866 else {
867 sg_scsi_id_t __user *sg_idp = p;
868
869 if (sdp->detached)
870 return -ENODEV;
871 __put_user((int) sdp->device->host->host_no,
872 &sg_idp->host_no);
873 __put_user((int) sdp->device->channel,
874 &sg_idp->channel);
875 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
876 __put_user((int) sdp->device->lun, &sg_idp->lun);
877 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
878 __put_user((short) sdp->device->host->cmd_per_lun,
879 &sg_idp->h_cmd_per_lun);
880 __put_user((short) sdp->device->queue_depth,
881 &sg_idp->d_queue_depth);
882 __put_user(0, &sg_idp->unused[0]);
883 __put_user(0, &sg_idp->unused[1]);
884 return 0;
885 }
886 case SG_SET_FORCE_PACK_ID:
887 result = get_user(val, ip);
888 if (result)
889 return result;
890 sfp->force_packid = val ? 1 : 0;
891 return 0;
892 case SG_GET_PACK_ID:
893 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
894 return -EFAULT;
895 read_lock_irqsave(&sfp->rq_list_lock, iflags);
896 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
897 if ((1 == srp->done) && (!srp->sg_io_owned)) {
898 read_unlock_irqrestore(&sfp->rq_list_lock,
899 iflags);
900 __put_user(srp->header.pack_id, ip);
901 return 0;
902 }
903 }
904 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
905 __put_user(-1, ip);
906 return 0;
907 case SG_GET_NUM_WAITING:
908 read_lock_irqsave(&sfp->rq_list_lock, iflags);
909 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
910 if ((1 == srp->done) && (!srp->sg_io_owned))
911 ++val;
912 }
913 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
914 return put_user(val, ip);
915 case SG_GET_SG_TABLESIZE:
916 return put_user(sdp->sg_tablesize, ip);
917 case SG_SET_RESERVED_SIZE:
918 result = get_user(val, ip);
919 if (result)
920 return result;
921 if (val < 0)
922 return -EINVAL;
44ec9542 923 val = min_t(int, val,
ae03bf63 924 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 925 if (val != sfp->reserve.bufflen) {
926 if (sg_res_in_use(sfp) || sfp->mmap_called)
927 return -EBUSY;
928 sg_remove_scat(&sfp->reserve);
929 sg_build_reserve(sfp, val);
930 }
931 return 0;
932 case SG_GET_RESERVED_SIZE:
44ec9542 933 val = min_t(int, sfp->reserve.bufflen,
ae03bf63 934 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 935 return put_user(val, ip);
936 case SG_SET_COMMAND_Q:
937 result = get_user(val, ip);
938 if (result)
939 return result;
940 sfp->cmd_q = val ? 1 : 0;
941 return 0;
942 case SG_GET_COMMAND_Q:
943 return put_user((int) sfp->cmd_q, ip);
944 case SG_SET_KEEP_ORPHAN:
945 result = get_user(val, ip);
946 if (result)
947 return result;
948 sfp->keep_orphan = val;
949 return 0;
950 case SG_GET_KEEP_ORPHAN:
951 return put_user((int) sfp->keep_orphan, ip);
952 case SG_NEXT_CMD_LEN:
953 result = get_user(val, ip);
954 if (result)
955 return result;
956 sfp->next_cmd_len = (val > 0) ? val : 0;
957 return 0;
958 case SG_GET_VERSION_NUM:
959 return put_user(sg_version_num, ip);
960 case SG_GET_ACCESS_COUNT:
961 /* faked - we don't have a real access count anymore */
962 val = (sdp->device ? 1 : 0);
963 return put_user(val, ip);
964 case SG_GET_REQUEST_TABLE:
965 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
966 return -EFAULT;
967 else {
cb59e840 968 sg_req_info_t *rinfo;
969 unsigned int ms;
970
971 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
972 GFP_KERNEL);
973 if (!rinfo)
974 return -ENOMEM;
1da177e4
LT		 975 read_lock_irqsave(&sfp->rq_list_lock, iflags);
976 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
977 ++val, srp = srp ? srp->nextrp : srp) {
978 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
979 if (srp) {
980 rinfo[val].req_state = srp->done + 1;
981 rinfo[val].problem =
982 srp->header.masked_status &
983 srp->header.host_status &
984 srp->header.driver_status;
cb59e840 985 if (srp->done)
986 rinfo[val].duration =
987 srp->header.duration;
988 else {
989 ms = jiffies_to_msecs(jiffies);
990 rinfo[val].duration =
991 (ms > srp->header.duration) ?
992 (ms - srp->header.duration) : 0;
993 }
1da177e4 994 rinfo[val].orphan = srp->orphan;
cb59e840 995 rinfo[val].sg_io_owned =
996 srp->sg_io_owned;
997 rinfo[val].pack_id =
998 srp->header.pack_id;
999 rinfo[val].usr_ptr =
1000 srp->header.usr_ptr;
1da177e4
LT		 1001 }
1002 }
1003 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840 1004 result = __copy_to_user(p, rinfo,
1005 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1006 result = result ? -EFAULT : 0;
1007 kfree(rinfo);
1008 return result;
1da177e4
LT		 1009 }
1010 case SG_EMULATED_HOST:
1011 if (sdp->detached)
1012 return -ENODEV;
1013 return put_user(sdp->device->host->hostt->emulated, ip);
1014 case SG_SCSI_RESET:
1015 if (sdp->detached)
1016 return -ENODEV;
1017 if (filp->f_flags & O_NONBLOCK) {
939647ee 1018 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1019 return -EBUSY;
1020 } else if (!scsi_block_when_processing_errors(sdp->device))
1021 return -EBUSY;
1022 result = get_user(val, ip);
1023 if (result)
1024 return result;
1025 if (SG_SCSI_RESET_NOTHING == val)
1026 return 0;
1027 switch (val) {
1028 case SG_SCSI_RESET_DEVICE:
1029 val = SCSI_TRY_RESET_DEVICE;
1030 break;
39120e11
BK		 1031 case SG_SCSI_RESET_TARGET:
1032 val = SCSI_TRY_RESET_TARGET;
1033 break;
1da177e4
LT		 1034 case SG_SCSI_RESET_BUS:
1035 val = SCSI_TRY_RESET_BUS;
1036 break;
1037 case SG_SCSI_RESET_HOST:
1038 val = SCSI_TRY_RESET_HOST;
1039 break;
1040 default:
1041 return -EINVAL;
1042 }
1043 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1044 return -EACCES;
1045 return (scsi_reset_provider(sdp->device, val) ==
1046 SUCCESS) ? 0 : -EIO;
1047 case SCSI_IOCTL_SEND_COMMAND:
1048 if (sdp->detached)
1049 return -ENODEV;
1050 if (read_only) {
1051 unsigned char opcode = WRITE_6;
1052 Scsi_Ioctl_Command __user *siocp = p;
1053
1054 if (copy_from_user(&opcode, siocp->data, 1))
1055 return -EFAULT;
14e507b8 1056 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1057 return -EPERM;
1058 }
e915e872 1059 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1da177e4
LT		 1060 case SG_SET_DEBUG:
1061 result = get_user(val, ip);
1062 if (result)
1063 return result;
1064 sdp->sgdebug = (char) val;
1065 return 0;
1066 case SCSI_IOCTL_GET_IDLUN:
1067 case SCSI_IOCTL_GET_BUS_NUMBER:
1068 case SCSI_IOCTL_PROBE_HOST:
1069 case SG_GET_TRANSFORM:
1070 if (sdp->detached)
1071 return -ENODEV;
1072 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542 1073 case BLKSECTGET:
ae03bf63 1074 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
44ec9542 1075 ip);
6da127ad
CS		 1076 case BLKTRACESETUP:
1077 return blk_trace_setup(sdp->device->request_queue,
1078 sdp->disk->disk_name,
76e3a19d 1079 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
d0deef5b 1080 NULL,
6da127ad
CS		 1081 (char *)arg);
1082 case BLKTRACESTART:
1083 return blk_trace_startstop(sdp->device->request_queue, 1);
1084 case BLKTRACESTOP:
1085 return blk_trace_startstop(sdp->device->request_queue, 0);
1086 case BLKTRACETEARDOWN:
1087 return blk_trace_remove(sdp->device->request_queue);
1da177e4
LT		 1088 default:
1089 if (read_only)
1090 return -EPERM; /* don't know so take safe approach */
1091 return scsi_ioctl(sdp->device, cmd_in, p);
1092 }
1093}
1094
1095#ifdef CONFIG_COMPAT
1096static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1097{
1098 Sg_device *sdp;
1099 Sg_fd *sfp;
1100 struct scsi_device *sdev;
1101
1102 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1103 return -ENXIO;
1104
1105 sdev = sdp->device;
1106 if (sdev->host->hostt->compat_ioctl) {
1107 int ret;
1108
1109 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1110
1111 return ret;
1112 }
1113
1114 return -ENOIOCTLCMD;
1115}
1116#endif
1117
1118static unsigned int
1119sg_poll(struct file *filp, poll_table * wait)
1120{
1121 unsigned int res = 0;
1122 Sg_device *sdp;
1123 Sg_fd *sfp;
1124 Sg_request *srp;
1125 int count = 0;
1126 unsigned long iflags;
1127
ebaf466b
JE		 1128 sfp = filp->private_data;
1129 if (!sfp)
1130 return POLLERR;
1131 sdp = sfp->parentdp;
1132 if (!sdp)
1da177e4
LT		 1133 return POLLERR;
1134 poll_wait(filp, &sfp->read_wait, wait);
1135 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1136 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1137 /* if any read waiting, flag it */
1138 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1139 res = POLLIN | POLLRDNORM;
1140 ++count;
1141 }
1142 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1143
1144 if (sdp->detached)
1145 res |= POLLHUP;
1146 else if (!sfp->cmd_q) {
1147 if (0 == count)
1148 res |= POLLOUT | POLLWRNORM;
1149 } else if (count < SG_MAX_QUEUE)
1150 res |= POLLOUT | POLLWRNORM;
1151 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1152 sdp->disk->disk_name, (int) res));
1153 return res;
1154}
1155
1156static int
1157sg_fasync(int fd, struct file *filp, int mode)
1158{
1da177e4
LT		 1159 Sg_device *sdp;
1160 Sg_fd *sfp;
1161
1162 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1163 return -ENXIO;
1164 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1165 sdp->disk->disk_name, mode));
1166
60aa4924 1167 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1da177e4
LT		 1168}
1169
a13ff0bb
NP		 1170static int
1171sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1172{
1173 Sg_fd *sfp;
d6b10348 1174 unsigned long offset, len, sa;
1da177e4 1175 Sg_scatter_hold *rsv_schp;
10db10d1 1176 int k, length;
1da177e4
LT		 1177
1178 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1179 return VM_FAULT_SIGBUS;
1da177e4 1180 rsv_schp = &sfp->reserve;
a13ff0bb 1181 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1182 if (offset >= rsv_schp->bufflen)
a13ff0bb
NP		 1183 return VM_FAULT_SIGBUS;
1184 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1da177e4 1185 offset, rsv_schp->k_use_sg));
d6b10348 1186 sa = vma->vm_start;
10db10d1
FT		 1187 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1188 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1189 len = vma->vm_end - sa;
10db10d1 1190 len = (len < length) ? len : length;
d6b10348 1191 if (offset < len) {
10db10d1
FT		 1192 struct page *page = nth_page(rsv_schp->pages[k],
1193 offset >> PAGE_SHIFT);
d6b10348 1194 get_page(page); /* increment page count */
a13ff0bb
NP		 1195 vmf->page = page;
1196 return 0; /* success */
1da177e4 1197 }
d6b10348
MC		 1198 sa += len;
1199 offset -= len;
1da177e4 1200 }
d6b10348 1201
a13ff0bb 1202 return VM_FAULT_SIGBUS;
1da177e4
LT		 1203}
1204
f0f37e2f 1205static const struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1206 .fault = sg_vma_fault,
1da177e4
LT		 1207};
1208
1209static int
1210sg_mmap(struct file *filp, struct vm_area_struct *vma)
1211{
1212 Sg_fd *sfp;
d6b10348 1213 unsigned long req_sz, len, sa;
1da177e4 1214 Sg_scatter_hold *rsv_schp;
10db10d1 1215 int k, length;
1da177e4
LT		 1216
1217 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1218 return -ENXIO;
cb59e840 1219 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1220 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1221 (void *) vma->vm_start, (int) req_sz));
1222 if (vma->vm_pgoff)
1223 return -EINVAL; /* want no offset */
1224 rsv_schp = &sfp->reserve;
1225 if (req_sz > rsv_schp->bufflen)
1226 return -ENOMEM; /* cannot map more than reserved buffer */
1227
d6b10348 1228 sa = vma->vm_start;
10db10d1
FT		 1229 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1230 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1231 len = vma->vm_end - sa;
10db10d1 1232 len = (len < length) ? len : length;
d6b10348 1233 sa += len;
1da177e4 1234 }
d6b10348 1235
f9aed0e2 1236 sfp->mmap_called = 1;
314e51b9 1237 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1da177e4
LT		 1238 vma->vm_private_data = sfp;
1239 vma->vm_ops = &sg_mmap_vm_ops;
1240 return 0;
1241}
1242
c96952ed
FT		 1243static void sg_rq_end_io_usercontext(struct work_struct *work)
1244{
1245 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1246 struct sg_fd *sfp = srp->parentfp;
1247
1248 sg_finish_rem_req(srp);
1249 kref_put(&sfp->f_ref, sg_remove_sfp);
1250}
1251
a91a3a20
FT		 1252/*
1253 * This function is a "bottom half" handler that is called by the mid
1254 * level when a command is completed (or has failed).
1255 */
1256static void sg_rq_end_io(struct request *rq, int uptodate)
1da177e4 1257{
a91a3a20 1258 struct sg_request *srp = rq->end_io_data;
c6517b79 1259 Sg_device *sdp;
1da177e4 1260 Sg_fd *sfp;
1da177e4 1261 unsigned long iflags;
cb59e840 1262 unsigned int ms;
a91a3a20 1263 char *sense;
c6517b79 1264 int result, resid, done = 1;
1da177e4 1265
c6517b79 1266 if (WARN_ON(srp->done != 0))
1da177e4 1267 return;
c6517b79 1268
1da177e4 1269 sfp = srp->parentfp;
c6517b79 1270 if (WARN_ON(sfp == NULL))
1da177e4 1271 return;
c6517b79
TB		 1272
1273 sdp = sfp->parentdp;
1274 if (unlikely(sdp->detached))
1275 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1da177e4 1276
a91a3a20
FT		 1277 sense = rq->sense;
1278 result = rq->errors;
c3a4d78c 1279 resid = rq->resid_len;
1da177e4
LT		 1280
1281 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1282 sdp->disk->disk_name, srp->header.pack_id, result));
1283 srp->header.resid = resid;
cb59e840 1284 ms = jiffies_to_msecs(jiffies);
1285 srp->header.duration = (ms > srp->header.duration) ?
1286 (ms - srp->header.duration) : 0;
d6b10348 1287 if (0 != result) {
1da177e4
LT		 1288 struct scsi_sense_hdr sshdr;
1289
d6b10348
MC		 1290 srp->header.status = 0xff & result;
1291 srp->header.masked_status = status_byte(result);
1292 srp->header.msg_status = msg_byte(result);
1293 srp->header.host_status = host_byte(result);
1294 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1295 if ((sdp->sgdebug > 0) &&
1296 ((CHECK_CONDITION == srp->header.masked_status) ||
1297 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1298 __scsi_print_sense("sg_cmd_done", sense,
1299 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1300
1301 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1302 if (driver_byte(result) != 0
1303 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1304 && !scsi_sense_is_deferred(&sshdr)
1305 && sshdr.sense_key == UNIT_ATTENTION
1306 && sdp->device->removable) {
1307 /* Detected possible disc change. Set the bit - this */
1308 /* may be used if there are filesystems using this device */
1309 sdp->device->changed = 1;
1310 }
1311 }
1312 /* Rely on write phase to clean out srp status values, so no "else" */
1313
c6517b79
TB		 1314 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1315 if (unlikely(srp->orphan)) {
1da177e4
LT		 1316 if (sfp->keep_orphan)
1317 srp->sg_io_owned = 0;
c6517b79
TB		 1318 else
1319 done = 0;
1da177e4 1320 }
c6517b79
TB		 1321 srp->done = done;
1322 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1323
1324 if (likely(done)) {
1325 /* Now wake up any sg_read() that is waiting for this
1326 * packet.
1327 */
1da177e4 1328 wake_up_interruptible(&sfp->read_wait);
c6517b79 1329 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
c96952ed 1330 kref_put(&sfp->f_ref, sg_remove_sfp);
015640ed
FT		 1331 } else {
1332 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1333 schedule_work(&srp->ew.work);
1334 }
1da177e4
LT		 1335}
1336
828c0950 1337static const struct file_operations sg_fops = {
1da177e4
LT		 1338 .owner = THIS_MODULE,
1339 .read = sg_read,
1340 .write = sg_write,
1341 .poll = sg_poll,
37b9d1e0 1342 .unlocked_ioctl = sg_ioctl,
1da177e4
LT		 1343#ifdef CONFIG_COMPAT
1344 .compat_ioctl = sg_compat_ioctl,
1345#endif
1346 .open = sg_open,
1347 .mmap = sg_mmap,
1348 .release = sg_release,
1349 .fasync = sg_fasync,
6038f373 1350 .llseek = no_llseek,
1da177e4
LT		 1351};
1352
d253878b 1353static struct class *sg_sysfs_class;
1da177e4
LT		 1354
1355static int sg_sysfs_valid = 0;
1356
7c07d613 1357static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1358{
d6b10348 1359 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1360 Sg_device *sdp;
1361 unsigned long iflags;
7c07d613
JB		 1362 int error;
1363 u32 k;
1da177e4 1364
24669f75 1365 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1366 if (!sdp) {
1367 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1368 return ERR_PTR(-ENOMEM);
1369 }
c6517b79 1370
b98c52b5 1371 idr_preload(GFP_KERNEL);
7c07d613 1372 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4 1373
b98c52b5
TH		 1374 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1375 if (error < 0) {
1376 if (error == -ENOSPC) {
1377 sdev_printk(KERN_WARNING, scsidp,
1378 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1379 scsidp->type, SG_MAX_DEVS - 1);
1380 error = -ENODEV;
1381 } else {
1382 printk(KERN_WARNING
1383 "idr allocation Sg_device failure: %d\n", error);
1384 }
1385 goto out_unlock;
1da177e4 1386 }
b98c52b5 1387 k = error;
1da177e4 1388
1da177e4
LT		 1389 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1390 sprintf(disk->disk_name, "sg%d", k);
1391 disk->first_minor = k;
1392 sdp->disk = disk;
1393 sdp->device = scsidp;
1f962ebc 1394 spin_lock_init(&sdp->sfd_lock);
3442f802 1395 INIT_LIST_HEAD(&sdp->sfds);
15b06f9a 1396 init_rwsem(&sdp->o_sem);
8a78362c 1397 sdp->sg_tablesize = queue_max_segments(q);
7c07d613 1398 sdp->index = k;
c6517b79 1399 kref_init(&sdp->d_ref);
b98c52b5 1400 error = 0;
c6517b79 1401
b98c52b5 1402out_unlock:
c6517b79 1403 write_unlock_irqrestore(&sg_index_lock, iflags);
b98c52b5 1404 idr_preload_end();
1da177e4 1405
7c07d613 1406 if (error) {
1da177e4 1407 kfree(sdp);
7c07d613
JB		 1408 return ERR_PTR(error);
1409 }
1410 return sdp;
1da177e4
LT		 1411}
1412
1413static int
ee959b00 1414sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1415{
ee959b00 1416 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1417 struct gendisk *disk;
1418 Sg_device *sdp = NULL;
1419 struct cdev * cdev = NULL;
7c07d613 1420 int error;
454e8957 1421 unsigned long iflags;
1da177e4
LT		 1422
1423 disk = alloc_disk(1);
1424 if (!disk) {
1425 printk(KERN_WARNING "alloc_disk failed\n");
1426 return -ENOMEM;
1427 }
1428 disk->major = SCSI_GENERIC_MAJOR;
1429
1430 error = -ENOMEM;
1431 cdev = cdev_alloc();
1432 if (!cdev) {
1433 printk(KERN_WARNING "cdev_alloc failed\n");
1434 goto out;
1435 }
1436 cdev->owner = THIS_MODULE;
1437 cdev->ops = &sg_fops;
1438
7c07d613
JB		 1439 sdp = sg_alloc(disk, scsidp);
1440 if (IS_ERR(sdp)) {
1da177e4 1441 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1442 error = PTR_ERR(sdp);
1da177e4
LT		 1443 goto out;
1444 }
1da177e4 1445
7c07d613 1446 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1447 if (error)
454e8957 1448 goto cdev_add_err;
5e3c34c1 1449
1da177e4
LT		 1450 sdp->cdev = cdev;
1451 if (sg_sysfs_valid) {
ee959b00 1452 struct device *sg_class_member;
1da177e4 1453
d73a1a67
GKH		 1454 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1455 MKDEV(SCSI_GENERIC_MAJOR,
1456 sdp->index),
1457 sdp, "%s", disk->disk_name);
d07e0361
FT		 1458 if (IS_ERR(sg_class_member)) {
1459 printk(KERN_ERR "sg_add: "
ee959b00 1460 "device_create failed\n");
d07e0361
FT		 1461 error = PTR_ERR(sg_class_member);
1462 goto cdev_add_err;
1463 }
d07e0361 1464 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1465 &sg_class_member->kobj, "generic");
1466 if (error)
1467 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1468 "'generic' back to sg%d\n", sdp->index);
1da177e4 1469 } else
7c07d613 1470 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1471
9ccfc756 1472 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1473 "Attached scsi generic sg%d type %d\n", sdp->index,
1474 scsidp->type);
1da177e4 1475
ee959b00 1476 dev_set_drvdata(cl_dev, sdp);
a24484f2 1477
1da177e4
LT		 1478 return 0;
1479
454e8957 1480cdev_add_err:
7c07d613
JB		 1481 write_lock_irqsave(&sg_index_lock, iflags);
1482 idr_remove(&sg_index_idr, sdp->index);
1483 write_unlock_irqrestore(&sg_index_lock, iflags);
1484 kfree(sdp);
454e8957 1485
1da177e4
LT		 1486out:
1487 put_disk(disk);
1488 if (cdev)
1489 cdev_del(cdev);
1490 return error;
1491}
1492
c6517b79
TB		 1493static void sg_device_destroy(struct kref *kref)
1494{
1495 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1496 unsigned long flags;
1497
1498 /* CAUTION! Note that the device can still be found via idr_find()
1499 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1500 * any other cleanup.
1501 */
1502
1503 write_lock_irqsave(&sg_index_lock, flags);
1504 idr_remove(&sg_index_idr, sdp->index);
1505 write_unlock_irqrestore(&sg_index_lock, flags);
1506
1507 SCSI_LOG_TIMEOUT(3,
1508 printk("sg_device_destroy: %s\n",
1509 sdp->disk->disk_name));
1510
1511 put_disk(sdp->disk);
1512 kfree(sdp);
1513}
1514
1515static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1516{
ee959b00
TJ		 1517 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1518 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1519 unsigned long iflags;
1520 Sg_fd *sfp;
1da177e4 1521
c6517b79 1522 if (!sdp || sdp->detached)
1da177e4 1523 return;
7c07d613 1524
c6517b79
TB		 1525 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1526
1527 /* Need a write lock to set sdp->detached. */
7c07d613 1528 write_lock_irqsave(&sg_index_lock, iflags);
1f962ebc 1529 spin_lock(&sdp->sfd_lock);
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 1534 }
1f962ebc 1535 spin_unlock(&sdp->sfd_lock);
7c07d613
JB		 1536 write_unlock_irqrestore(&sg_index_lock, iflags);
1537
1538 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1539 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1540 cdev_del(sdp->cdev);
1541 sdp->cdev = NULL;
1da177e4 1542
c6517b79 1543 sg_put_dev(sdp);
1da177e4
LT		 1544}
1545
6460e75a
DG		 1546module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1547module_param_named(def_reserved_size, def_reserved_size, int,
1548 S_IRUGO | S_IWUSR);
1da177e4
LT		 1549module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1550
1551MODULE_AUTHOR("Douglas Gilbert");
1552MODULE_DESCRIPTION("SCSI generic (sg) driver");
1553MODULE_LICENSE("GPL");
1554MODULE_VERSION(SG_VERSION_STR);
f018fa55 1555MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1556
6460e75a
DG		 1557MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1558 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1559MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1560MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1561
1562static int __init
1563init_sg(void)
1564{
1565 int rc;
1566
6460e75a
DG		 1567 if (scatter_elem_sz < PAGE_SIZE) {
1568 scatter_elem_sz = PAGE_SIZE;
1569 scatter_elem_sz_prev = scatter_elem_sz;
1570 }
1da177e4
LT		 1571 if (def_reserved_size >= 0)
1572 sg_big_buff = def_reserved_size;
6460e75a
DG		 1573 else
1574 def_reserved_size = sg_big_buff;
1da177e4
LT		 1575
1576 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1577 SG_MAX_DEVS, "sg");
1578 if (rc)
1579 return rc;
d253878b 1580 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1581 if ( IS_ERR(sg_sysfs_class) ) {
1582 rc = PTR_ERR(sg_sysfs_class);
1583 goto err_out;
1584 }
1585 sg_sysfs_valid = 1;
1586 rc = scsi_register_interface(&sg_interface);
1587 if (0 == rc) {
1588#ifdef CONFIG_SCSI_PROC_FS
1589 sg_proc_init();
1590#endif /* CONFIG_SCSI_PROC_FS */
1591 return 0;
1592 }
d253878b 1593 class_destroy(sg_sysfs_class);
1da177e4
LT		 1594err_out:
1595 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1596 return rc;
1597}
1598
1599static void __exit
1600exit_sg(void)
1601{
1602#ifdef CONFIG_SCSI_PROC_FS
1603 sg_proc_cleanup();
1604#endif /* CONFIG_SCSI_PROC_FS */
1605 scsi_unregister_interface(&sg_interface);
d253878b 1606 class_destroy(sg_sysfs_class);
1da177e4
LT		 1607 sg_sysfs_valid = 0;
1608 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1609 SG_MAX_DEVS);
7c07d613 1610 idr_destroy(&sg_index_idr);
1da177e4
LT		 1611}
1612
44c7b0ea 1613static int sg_start_req(Sg_request *srp, unsigned char *cmd)
10865dfa 1614{
626710c9 1615 int res;
10865dfa 1616 struct request *rq;
44c7b0ea
FT		 1617 Sg_fd *sfp = srp->parentfp;
1618 sg_io_hdr_t *hp = &srp->header;
1619 int dxfer_len = (int) hp->dxfer_len;
1620 int dxfer_dir = hp->dxfer_direction;
626710c9 1621 unsigned int iov_count = hp->iovec_count;
44c7b0ea
FT		 1622 Sg_scatter_hold *req_schp = &srp->data;
1623 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1624 struct request_queue *q = sfp->parentdp->device->request_queue;
626710c9 1625 struct rq_map_data *md, map_data;
10865dfa
FT		 1626 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1627
44c7b0ea
FT		 1628 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1629 dxfer_len));
1630
10865dfa
FT		 1631 rq = blk_get_request(q, rw, GFP_ATOMIC);
1632 if (!rq)
1633 return -ENOMEM;
1634
1635 memcpy(rq->cmd, cmd, hp->cmd_len);
1636
1637 rq->cmd_len = hp->cmd_len;
1638 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1639
1640 srp->rq = rq;
1641 rq->end_io_data = srp;
1642 rq->sense = srp->sense_b;
1643 rq->retries = SG_DEFAULT_RETRIES;
1644
1da177e4 1645 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1646 return 0;
10865dfa 1647
626710c9
FT		 1648 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1649 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1650 !sfp->parentdp->device->host->unchecked_isa_dma &&
2610a254 1651 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
626710c9
FT		 1652 md = NULL;
1653 else
1654 md = &map_data;
1655
1656 if (md) {
1657 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1658 sg_link_reserve(sfp, srp, dxfer_len);
1659 else {
1660 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1661 if (res)
1662 return res;
1663 }
7e56cb0f 1664
626710c9
FT		 1665 md->pages = req_schp->pages;
1666 md->page_order = req_schp->page_order;
1667 md->nr_entries = req_schp->k_use_sg;
56c451f4 1668 md->offset = 0;
97ae77a1 1669 md->null_mapped = hp->dxferp ? 0 : 1;
ecb554a8
FT		 1670 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1671 md->from_user = 1;
1672 else
1673 md->from_user = 0;
626710c9
FT		 1674 }
1675
0fdf96b6
FT		 1676 if (iov_count) {
1677 int len, size = sizeof(struct sg_iovec) * iov_count;
1678 struct iovec *iov;
1679
3094141c
JL		 1680 iov = memdup_user(hp->dxferp, size);
1681 if (IS_ERR(iov))
1682 return PTR_ERR(iov);
0fdf96b6
FT		 1683
1684 len = iov_length(iov, iov_count);
1685 if (hp->dxfer_len < len) {
1686 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1687 len = hp->dxfer_len;
1688 }
1689
1690 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1691 iov_count,
1692 len, GFP_ATOMIC);
1693 kfree(iov);
1694 } else
626710c9
FT		 1695 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1696 hp->dxfer_len, GFP_ATOMIC);
10db10d1
FT		 1697
1698 if (!res) {
626710c9 1699 srp->bio = rq->bio;
10db10d1 1700
626710c9
FT		 1701 if (!md) {
1702 req_schp->dio_in_use = 1;
1703 hp->info |= SG_INFO_DIRECT_IO;
1704 }
1705 }
10db10d1 1706 return res;
1da177e4
LT		 1707}
1708
e7ee4cc0 1709static int sg_finish_rem_req(Sg_request * srp)
1da177e4 1710{
e7ee4cc0
FT		 1711 int ret = 0;
1712
1da177e4
LT		 1713 Sg_fd *sfp = srp->parentfp;
1714 Sg_scatter_hold *req_schp = &srp->data;
1715
1716 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
6e5a30cb
FT		 1717 if (srp->rq) {
1718 if (srp->bio)
e7ee4cc0 1719 ret = blk_rq_unmap_user(srp->bio);
10db10d1 1720
10865dfa 1721 blk_put_request(srp->rq);
6e5a30cb 1722 }
10865dfa 1723
e27168f8
CS		 1724 if (srp->res_used)
1725 sg_unlink_reserve(sfp, srp);
1726 else
1727 sg_remove_scat(req_schp);
1728
1da177e4 1729 sg_remove_request(sfp, srp);
e7ee4cc0
FT		 1730
1731 return ret;
1da177e4
LT		 1732}
1733
1734static int
1735sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1736{
10db10d1 1737 int sg_bufflen = tablesize * sizeof(struct page *);
2d20eaf9 1738 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1739
10db10d1
FT		 1740 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1741 if (!schp->pages)
1da177e4 1742 return -ENOMEM;
1da177e4 1743 schp->sglist_len = sg_bufflen;
d6b10348 1744 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1745}
1746
1da177e4
LT		 1747static int
1748sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1749{
10db10d1 1750 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1751 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1752 int blk_size = buff_size, order;
1753 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4 1754
fb119935 1755 if (blk_size < 0)
1da177e4
LT		 1756 return -EFAULT;
1757 if (0 == blk_size)
1758 ++blk_size; /* don't know why */
b2ed6c69
FT		 1759 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1760 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1da177e4
LT		 1761 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1762 buff_size, blk_size));
d6b10348
MC		 1763
1764 /* N.B. ret_sz carried into this block ... */
1765 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1766 if (mx_sc_elems < 0)
1767 return mx_sc_elems; /* most likely -ENOMEM */
1768
6460e75a
DG		 1769 num = scatter_elem_sz;
1770 if (unlikely(num != scatter_elem_sz_prev)) {
1771 if (num < PAGE_SIZE) {
1772 scatter_elem_sz = PAGE_SIZE;
1773 scatter_elem_sz_prev = PAGE_SIZE;
1774 } else
1775 scatter_elem_sz_prev = num;
1776 }
10db10d1
FT		 1777
1778 if (sfp->low_dma)
1779 gfp_mask |= GFP_DMA;
1780
1781 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1782 gfp_mask |= __GFP_ZERO;
1783
1784 order = get_order(num);
1785retry:
1786 ret_sz = 1 << (PAGE_SHIFT + order);
1787
1788 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1789 k++, rem_sz -= ret_sz) {
1790
6460e75a 1791 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1792 scatter_elem_sz_prev : rem_sz;
1793
1794 schp->pages[k] = alloc_pages(gfp_mask, order);
1795 if (!schp->pages[k])
1796 goto out;
d6b10348 1797
6460e75a
DG		 1798 if (num == scatter_elem_sz_prev) {
1799 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1800 scatter_elem_sz = ret_sz;
1801 scatter_elem_sz_prev = ret_sz;
1802 }
1803 }
d6b10348 1804
7ca63cb4
DG		 1805 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1806 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1807 } /* end of for loop */
1808
10db10d1 1809 schp->page_order = order;
d6b10348 1810 schp->k_use_sg = k;
7ca63cb4
DG		 1811 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1812 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1813
1814 schp->bufflen = blk_size;
1815 if (rem_sz > 0) /* must have failed */
1816 return -ENOMEM;
1da177e4 1817 return 0;
10db10d1
FT		 1818out:
1819 for (i = 0; i < k; i++)
e71044ee 1820 __free_pages(schp->pages[i], order);
10db10d1
FT		 1821
1822 if (--order >= 0)
1823 goto retry;
1824
1825 return -ENOMEM;
1da177e4
LT		 1826}
1827
1da177e4
LT		 1828static void
1829sg_remove_scat(Sg_scatter_hold * schp)
1830{
1831 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1832 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1833 if (!schp->dio_in_use) {
1da177e4
LT		 1834 int k;
1835
10db10d1 1836 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1da177e4 1837 SCSI_LOG_TIMEOUT(5, printk(
10db10d1
FT		 1838 "sg_remove_scat: k=%d, pg=0x%p\n",
1839 k, schp->pages[k]));
1840 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1841 }
6e5a30cb 1842
10db10d1 1843 kfree(schp->pages);
1da177e4 1844 }
d6b10348 1845 }
1da177e4
LT		 1846 memset(schp, 0, sizeof (*schp));
1847}
1848
1da177e4
LT		 1849static int
1850sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1851{
1852 Sg_scatter_hold *schp = &srp->data;
d6b10348 1853 int k, num;
1da177e4
LT		 1854
1855 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1856 num_read_xfer));
1857 if ((!outp) || (num_read_xfer <= 0))
1858 return 0;
d6b10348 1859
10db10d1
FT		 1860 num = 1 << (PAGE_SHIFT + schp->page_order);
1861 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1862 if (num > num_read_xfer) {
10db10d1 1863 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1864 num_read_xfer))
1865 return -EFAULT;
1866 break;
1867 } else {
10db10d1 1868 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1869 num))
1870 return -EFAULT;
1871 num_read_xfer -= num;
1872 if (num_read_xfer <= 0)
1da177e4 1873 break;
d6b10348 1874 outp += num;
1da177e4 1875 }
1da177e4 1876 }
d6b10348 1877
1da177e4
LT		 1878 return 0;
1879}
1880
1881static void
1882sg_build_reserve(Sg_fd * sfp, int req_size)
1883{
1884 Sg_scatter_hold *schp = &sfp->reserve;
1885
1886 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1887 do {
1888 if (req_size < PAGE_SIZE)
1889 req_size = PAGE_SIZE;
1890 if (0 == sg_build_indirect(schp, sfp, req_size))
1891 return;
1892 else
1893 sg_remove_scat(schp);
1894 req_size >>= 1; /* divide by 2 */
1895 } while (req_size > (PAGE_SIZE / 2));
1896}
1897
1898static void
1899sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1900{
1901 Sg_scatter_hold *req_schp = &srp->data;
1902 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 1903 int k, num, rem;
1da177e4
LT		 1904
1905 srp->res_used = 1;
1906 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 1907 rem = size;
d6b10348 1908
10db10d1
FT		 1909 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1910 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 1911 if (rem <= num) {
d6b10348
MC		 1912 req_schp->k_use_sg = k + 1;
1913 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 1914 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 1915
1916 req_schp->bufflen = size;
10db10d1 1917 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 1918 break;
1919 } else
1920 rem -= num;
1da177e4 1921 }
d6b10348
MC		 1922
1923 if (k >= rsv_schp->k_use_sg)
1924 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 1925}
1926
1927static void
1928sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1929{
1930 Sg_scatter_hold *req_schp = &srp->data;
1da177e4
LT		 1931
1932 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1933 (int) req_schp->k_use_sg));
1da177e4
LT		 1934 req_schp->k_use_sg = 0;
1935 req_schp->bufflen = 0;
10db10d1
FT		 1936 req_schp->pages = NULL;
1937 req_schp->page_order = 0;
1da177e4
LT		 1938 req_schp->sglist_len = 0;
1939 sfp->save_scat_len = 0;
1940 srp->res_used = 0;
1941}
1942
1943static Sg_request *
1944sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1945{
1946 Sg_request *resp;
1947 unsigned long iflags;
1948
1949 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1950 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1951 /* look for requests that are ready + not SG_IO owned */
1952 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1953 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1954 resp->done = 2; /* guard against other readers */
1955 break;
1956 }
1957 }
1958 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1959 return resp;
1960}
1961
1da177e4
LT		 1962/* always adds to end of list */
1963static Sg_request *
1964sg_add_request(Sg_fd * sfp)
1965{
1966 int k;
1967 unsigned long iflags;
1968 Sg_request *resp;
1969 Sg_request *rp = sfp->req_arr;
1970
1971 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1972 resp = sfp->headrp;
1973 if (!resp) {
1974 memset(rp, 0, sizeof (Sg_request));
1975 rp->parentfp = sfp;
1976 resp = rp;
1977 sfp->headrp = resp;
1978 } else {
1979 if (0 == sfp->cmd_q)
1980 resp = NULL; /* command queuing disallowed */
1981 else {
1982 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
1983 if (!rp->parentfp)
1984 break;
1985 }
1986 if (k < SG_MAX_QUEUE) {
1987 memset(rp, 0, sizeof (Sg_request));
1988 rp->parentfp = sfp;
1989 while (resp->nextrp)
1990 resp = resp->nextrp;
1991 resp->nextrp = rp;
1992 resp = rp;
1993 } else
1994 resp = NULL;
1995 }
1996 }
1997 if (resp) {
1998 resp->nextrp = NULL;
cb59e840 1999 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2000 }
2001 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2002 return resp;
2003}
2004
2005/* Return of 1 for found; 0 for not found */
2006static int
2007sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2008{
2009 Sg_request *prev_rp;
2010 Sg_request *rp;
2011 unsigned long iflags;
2012 int res = 0;
2013
2014 if ((!sfp) || (!srp) || (!sfp->headrp))
2015 return res;
2016 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2017 prev_rp = sfp->headrp;
2018 if (srp == prev_rp) {
2019 sfp->headrp = prev_rp->nextrp;
2020 prev_rp->parentfp = NULL;
2021 res = 1;
2022 } else {
2023 while ((rp = prev_rp->nextrp)) {
2024 if (srp == rp) {
2025 prev_rp->nextrp = rp->nextrp;
2026 rp->parentfp = NULL;
2027 res = 1;
2028 break;
2029 }
2030 prev_rp = rp;
2031 }
2032 }
2033 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2034 return res;
2035}
2036
1da177e4
LT		 2037static Sg_fd *
2038sg_add_sfp(Sg_device * sdp, int dev)
2039{
2040 Sg_fd *sfp;
2041 unsigned long iflags;
44ec9542 2042 int bufflen;
1da177e4 2043
d6b10348 2044 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4 2045 if (!sfp)
e32c9e63 2046 return ERR_PTR(-ENOMEM);
d6b10348 2047
1da177e4
LT		 2048 init_waitqueue_head(&sfp->read_wait);
2049 rwlock_init(&sfp->rq_list_lock);
2050
c6517b79 2051 kref_init(&sfp->f_ref);
1da177e4
LT		 2052 sfp->timeout = SG_DEFAULT_TIMEOUT;
2053 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2054 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2055 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2056 sdp->device->host->unchecked_isa_dma : 1;
2057 sfp->cmd_q = SG_DEF_COMMAND_Q;
2058 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2059 sfp->parentdp = sdp;
1f962ebc 2060 spin_lock_irqsave(&sdp->sfd_lock, iflags);
e32c9e63 2061 if (sdp->detached) {
1f962ebc 2062 spin_unlock_irqrestore(&sdp->sfd_lock, iflags);
e32c9e63
VC		 2063 return ERR_PTR(-ENODEV);
2064 }
3442f802 2065 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
1f962ebc 2066 spin_unlock_irqrestore(&sdp->sfd_lock, iflags);
1da177e4 2067 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2068 if (unlikely(sg_big_buff != def_reserved_size))
2069 sg_big_buff = def_reserved_size;
2070
44ec9542 2071 bufflen = min_t(int, sg_big_buff,
ae03bf63 2072 queue_max_sectors(sdp->device->request_queue) * 512);
44ec9542 2073 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2074 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2075 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
c6517b79
TB		 2076
2077 kref_get(&sdp->d_ref);
2078 __module_get(THIS_MODULE);
1da177e4
LT		 2079 return sfp;
2080}
2081
c6517b79 2082static void sg_remove_sfp_usercontext(struct work_struct *work)
1da177e4 2083{
c6517b79
TB		 2084 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2085 struct sg_device *sdp = sfp->parentdp;
2086
2087 /* Cleanup any responses which were never read(). */
2088 while (sfp->headrp)
2089 sg_finish_rem_req(sfp->headrp);
1da177e4 2090
1da177e4 2091 if (sfp->reserve.bufflen > 0) {
c6517b79
TB		 2092 SCSI_LOG_TIMEOUT(6,
2093 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2094 (int) sfp->reserve.bufflen,
2095 (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2096 sg_remove_scat(&sfp->reserve);
2097 }
c6517b79
TB		 2098
2099 SCSI_LOG_TIMEOUT(6,
2100 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2101 sdp->disk->disk_name,
2102 sfp));
d6b10348 2103 kfree(sfp);
c6517b79
TB		 2104
2105 scsi_device_put(sdp->device);
2106 sg_put_dev(sdp);
2107 module_put(THIS_MODULE);
1da177e4
LT		 2108}
2109
c6517b79 2110static void sg_remove_sfp(struct kref *kref)
1da177e4 2111{
c6517b79 2112 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
1f962ebc 2113 struct sg_device *sdp = sfp->parentdp;
c6517b79 2114 unsigned long iflags;
1da177e4 2115
1f962ebc 2116 spin_lock_irqsave(&sdp->sfd_lock, iflags);
3442f802 2117 list_del(&sfp->sfd_siblings);
1f962ebc 2118 spin_unlock_irqrestore(&sdp->sfd_lock, iflags);
1da177e4 2119
015640ed
FT		 2120 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2121 schedule_work(&sfp->ew.work);
1da177e4
LT		 2122}
2123
2124static int
2125sg_res_in_use(Sg_fd * sfp)
2126{
2127 const Sg_request *srp;
2128 unsigned long iflags;
2129
2130 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2131 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2132 if (srp->res_used)
2133 break;
2134 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2135 return srp ? 1 : 0;
2136}
2137
1da177e4 2138#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2139static int
2140sg_idr_max_id(int id, void *p, void *data)
2141{
2142 int *k = data;
2143
2144 if (*k < id)
2145 *k = id;
2146
2147 return 0;
2148}
2149
1da177e4
LT		 2150static int
2151sg_last_dev(void)
2152{
53474c04 2153 int k = -1;
1da177e4
LT		 2154 unsigned long iflags;
2155
7c07d613
JB		 2156 read_lock_irqsave(&sg_index_lock, iflags);
2157 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2158 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2159 return k + 1; /* origin 1 */
2160}
2161#endif
2162
c6517b79
TB		 2163/* must be called with sg_index_lock held */
2164static Sg_device *sg_lookup_dev(int dev)
1da177e4 2165{
c6517b79
TB		 2166 return idr_find(&sg_index_idr, dev);
2167}
1da177e4 2168
c6517b79
TB		 2169static Sg_device *sg_get_dev(int dev)
2170{
2171 struct sg_device *sdp;
2172 unsigned long flags;
2173
2174 read_lock_irqsave(&sg_index_lock, flags);
2175 sdp = sg_lookup_dev(dev);
2176 if (!sdp)
2177 sdp = ERR_PTR(-ENXIO);
2178 else if (sdp->detached) {
2179 /* If sdp->detached, then the refcount may already be 0, in
2180 * which case it would be a bug to do kref_get().
2181 */
2182 sdp = ERR_PTR(-ENODEV);
2183 } else
2184 kref_get(&sdp->d_ref);
2185 read_unlock_irqrestore(&sg_index_lock, flags);
7c07d613 2186
1da177e4
LT		 2187 return sdp;
2188}
2189
c6517b79
TB		 2190static void sg_put_dev(struct sg_device *sdp)
2191{
2192 kref_put(&sdp->d_ref, sg_device_destroy);
2193}
2194
1da177e4
LT		 2195#ifdef CONFIG_SCSI_PROC_FS
2196
2197static struct proc_dir_entry *sg_proc_sgp = NULL;
2198
2199static char sg_proc_sg_dirname[] = "scsi/sg";
2200
2201static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2202
2203static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2204static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2205 size_t count, loff_t *off);
828c0950
AD		 2206static const struct file_operations adio_fops = {
2207 .owner = THIS_MODULE,
1da177e4 2208 .open = sg_proc_single_open_adio,
828c0950
AD		 2209 .read = seq_read,
2210 .llseek = seq_lseek,
1da177e4
LT		 2211 .write = sg_proc_write_adio,
2212 .release = single_release,
2213};
2214
2215static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2216static ssize_t sg_proc_write_dressz(struct file *filp,
2217 const char __user *buffer, size_t count, loff_t *off);
828c0950
AD		 2218static const struct file_operations dressz_fops = {
2219 .owner = THIS_MODULE,
1da177e4 2220 .open = sg_proc_single_open_dressz,
828c0950
AD		 2221 .read = seq_read,
2222 .llseek = seq_lseek,
1da177e4
LT		 2223 .write = sg_proc_write_dressz,
2224 .release = single_release,
2225};
2226
2227static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2228static int sg_proc_single_open_version(struct inode *inode, struct file *file);
828c0950
AD		 2229static const struct file_operations version_fops = {
2230 .owner = THIS_MODULE,
1da177e4 2231 .open = sg_proc_single_open_version,
828c0950
AD		 2232 .read = seq_read,
2233 .llseek = seq_lseek,
1da177e4
LT		 2234 .release = single_release,
2235};
2236
2237static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2238static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
828c0950
AD		 2239static const struct file_operations devhdr_fops = {
2240 .owner = THIS_MODULE,
1da177e4 2241 .open = sg_proc_single_open_devhdr,
828c0950
AD		 2242 .read = seq_read,
2243 .llseek = seq_lseek,
1da177e4
LT		 2244 .release = single_release,
2245};
2246
2247static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2248static int sg_proc_open_dev(struct inode *inode, struct file *file);
2249static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2250static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2251static void dev_seq_stop(struct seq_file *s, void *v);
828c0950
AD		 2252static const struct file_operations dev_fops = {
2253 .owner = THIS_MODULE,
1da177e4 2254 .open = sg_proc_open_dev,
828c0950
AD		 2255 .read = seq_read,
2256 .llseek = seq_lseek,
1da177e4
LT		 2257 .release = seq_release,
2258};
88e9d34c 2259static const struct seq_operations dev_seq_ops = {
1da177e4
LT		 2260 .start = dev_seq_start,
2261 .next = dev_seq_next,
2262 .stop = dev_seq_stop,
2263 .show = sg_proc_seq_show_dev,
2264};
2265
2266static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2267static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
828c0950
AD		 2268static const struct file_operations devstrs_fops = {
2269 .owner = THIS_MODULE,
1da177e4 2270 .open = sg_proc_open_devstrs,
828c0950
AD		 2271 .read = seq_read,
2272 .llseek = seq_lseek,
1da177e4
LT		 2273 .release = seq_release,
2274};
88e9d34c 2275static const struct seq_operations devstrs_seq_ops = {
1da177e4
LT		 2276 .start = dev_seq_start,
2277 .next = dev_seq_next,
2278 .stop = dev_seq_stop,
2279 .show = sg_proc_seq_show_devstrs,
2280};
2281
2282static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2283static int sg_proc_open_debug(struct inode *inode, struct file *file);
828c0950
AD		 2284static const struct file_operations debug_fops = {
2285 .owner = THIS_MODULE,
1da177e4 2286 .open = sg_proc_open_debug,
828c0950
AD		 2287 .read = seq_read,
2288 .llseek = seq_lseek,
1da177e4
LT		 2289 .release = seq_release,
2290};
88e9d34c 2291static const struct seq_operations debug_seq_ops = {
1da177e4
LT		 2292 .start = dev_seq_start,
2293 .next = dev_seq_next,
2294 .stop = dev_seq_stop,
2295 .show = sg_proc_seq_show_debug,
2296};
2297
2298
2299struct sg_proc_leaf {
2300 const char * name;
828c0950 2301 const struct file_operations * fops;
1da177e4
LT		 2302};
2303
18b8ba6c 2304static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
1da177e4
LT		 2305 {"allow_dio", &adio_fops},
2306 {"debug", &debug_fops},
2307 {"def_reserved_size", &dressz_fops},
2308 {"device_hdr", &devhdr_fops},
2309 {"devices", &dev_fops},
2310 {"device_strs", &devstrs_fops},
2311 {"version", &version_fops}
2312};
2313
2314static int
2315sg_proc_init(void)
2316{
6391a113 2317 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
d161a13f 2318 int k;
1da177e4 2319
66600221 2320 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2321 if (!sg_proc_sgp)
2322 return 1;
2323 for (k = 0; k < num_leaves; ++k) {
18b8ba6c 2324 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
d161a13f 2325 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f 2326 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2327 }
2328 return 0;
2329}
2330
2331static void
2332sg_proc_cleanup(void)
2333{
2334 int k;
6391a113 2335 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2336
2337 if (!sg_proc_sgp)
2338 return;
2339 for (k = 0; k < num_leaves; ++k)
2340 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2341 remove_proc_entry(sg_proc_sg_dirname, NULL);
2342}
2343
2344
2345static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2346{
2347 seq_printf(s, "%d\n", *((int *)s->private));
2348 return 0;
2349}
2350
2351static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2352{
2353 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2354}
2355
2356static ssize_t
2357sg_proc_write_adio(struct file *filp, const char __user *buffer,
2358 size_t count, loff_t *off)
2359{
7e95fffe
SB		 2360 int err;
2361 unsigned long num;
1da177e4
LT		 2362
2363 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2364 return -EACCES;
7e95fffe
SB		 2365 err = kstrtoul_from_user(buffer, count, 0, &num);
2366 if (err)
2367 return err;
2368 sg_allow_dio = num ? 1 : 0;
1da177e4
LT		 2369 return count;
2370}
2371
2372static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2373{
2374 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2375}
2376
2377static ssize_t
2378sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2379 size_t count, loff_t *off)
2380{
7e95fffe 2381 int err;
1da177e4 2382 unsigned long k = ULONG_MAX;
1da177e4
LT		 2383
2384 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2385 return -EACCES;
7e95fffe
SB		 2386
2387 err = kstrtoul_from_user(buffer, count, 0, &k);
2388 if (err)
2389 return err;
1da177e4
LT		 2390 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2391 sg_big_buff = k;
2392 return count;
2393 }
2394 return -ERANGE;
2395}
2396
2397static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2398{
2399 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2400 sg_version_date);
2401 return 0;
2402}
2403
2404static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2405{
2406 return single_open(file, sg_proc_seq_show_version, NULL);
2407}
2408
2409static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2410{
2411 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2412 "online\n");
2413 return 0;
2414}
2415
2416static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2417{
2418 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2419}
2420
2421struct sg_proc_deviter {
2422 loff_t index;
2423 size_t max;
2424};
2425
2426static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2427{
2428 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2429
729d70f5 2430 s->private = it;
1da177e4
LT		 2431 if (! it)
2432 return NULL;
729d70f5 2433
1da177e4
LT		 2434 it->index = *pos;
2435 it->max = sg_last_dev();
2436 if (it->index >= it->max)
729d70f5 2437 return NULL;
1da177e4 2438 return it;
1da177e4
LT		 2439}
2440
2441static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2442{
729d70f5 2443 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2444
2445 *pos = ++it->index;
2446 return (it->index < it->max) ? it : NULL;
2447}
2448
2449static void dev_seq_stop(struct seq_file *s, void *v)
2450{
729d70f5 2451 kfree(s->private);
1da177e4
LT		 2452}
2453
2454static int sg_proc_open_dev(struct inode *inode, struct file *file)
2455{
2456 return seq_open(file, &dev_seq_ops);
2457}
2458
2459static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2460{
2461 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2462 Sg_device *sdp;
2463 struct scsi_device *scsidp;
c6517b79 2464 unsigned long iflags;
1da177e4 2465
c6517b79
TB		 2466 read_lock_irqsave(&sg_index_lock, iflags);
2467 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2468 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2469 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2470 scsidp->host->host_no, scsidp->channel,
2471 scsidp->id, scsidp->lun, (int) scsidp->type,
2472 1,
2473 (int) scsidp->queue_depth,
2474 (int) scsidp->device_busy,
2475 (int) scsi_device_online(scsidp));
2476 else
2477 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
c6517b79 2478 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2479 return 0;
2480}
2481
2482static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2483{
2484 return seq_open(file, &devstrs_seq_ops);
2485}
2486
2487static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2488{
2489 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2490 Sg_device *sdp;
2491 struct scsi_device *scsidp;
c6517b79 2492 unsigned long iflags;
1da177e4 2493
c6517b79
TB		 2494 read_lock_irqsave(&sg_index_lock, iflags);
2495 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2496 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2497 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2498 scsidp->vendor, scsidp->model, scsidp->rev);
2499 else
2500 seq_printf(s, "<no active device>\n");
c6517b79 2501 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2502 return 0;
2503}
2504
1f962ebc 2505/* must be called while holding sg_index_lock and sfd_lock */
1da177e4
LT		 2506static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2507{
2508 int k, m, new_interface, blen, usg;
2509 Sg_request *srp;
2510 Sg_fd *fp;
2511 const sg_io_hdr_t *hp;
2512 const char * cp;
cb59e840 2513 unsigned int ms;
1da177e4 2514
3442f802
FT		 2515 k = 0;
2516 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2517 k++;
c6517b79 2518 read_lock(&fp->rq_list_lock); /* irqs already disabled */
1da177e4 2519 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3442f802 2520 "(res)sgat=%d low_dma=%d\n", k,
1da177e4
LT		 2521 jiffies_to_msecs(fp->timeout),
2522 fp->reserve.bufflen,
2523 (int) fp->reserve.k_use_sg,
2524 (int) fp->low_dma);
ebaf466b 2525 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
1da177e4 2526 (int) fp->cmd_q, (int) fp->force_packid,
ebaf466b 2527 (int) fp->keep_orphan);
c6517b79
TB		 2528 for (m = 0, srp = fp->headrp;
2529 srp != NULL;
2530 ++m, srp = srp->nextrp) {
1da177e4
LT		 2531 hp = &srp->header;
2532 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2533 if (srp->res_used) {
2534 if (new_interface &&
2535 (SG_FLAG_MMAP_IO & hp->flags))
2536 cp = " mmap>> ";
2537 else
2538 cp = " rb>> ";
2539 } else {
2540 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2541 cp = " dio>> ";
2542 else
2543 cp = " ";
2544 }
2545 seq_printf(s, cp);
d6b10348
MC		 2546 blen = srp->data.bufflen;
2547 usg = srp->data.k_use_sg;
1da177e4
LT		 2548 seq_printf(s, srp->done ?
2549 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2550 : "act:");
1da177e4
LT		 2551 seq_printf(s, " id=%d blen=%d",
2552 srp->header.pack_id, blen);
2553 if (srp->done)
2554 seq_printf(s, " dur=%d", hp->duration);
cb59e840 2555 else {
2556 ms = jiffies_to_msecs(jiffies);
1da177e4 2557 seq_printf(s, " t_o/elap=%d/%d",
cb59e840 2558 (new_interface ? hp->timeout :
2559 jiffies_to_msecs(fp->timeout)),
2560 (ms > hp->duration ? ms - hp->duration : 0));
2561 }
1da177e4
LT		 2562 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2563 (int) srp->data.cmd_opcode);
2564 }
2565 if (0 == m)
2566 seq_printf(s, " No requests active\n");
c6517b79 2567 read_unlock(&fp->rq_list_lock);
1da177e4
LT		 2568 }
2569}
2570
2571static int sg_proc_open_debug(struct inode *inode, struct file *file)
2572{
2573 return seq_open(file, &debug_seq_ops);
2574}
2575
2576static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2577{
2578 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2579 Sg_device *sdp;
c6517b79 2580 unsigned long iflags;
1da177e4
LT		 2581
2582 if (it && (0 == it->index)) {
7c07d613
JB		 2583 seq_printf(s, "max_active_device=%d(origin 1)\n",
2584 (int)it->max);
1da177e4
LT		 2585 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2586 }
1da177e4 2587
c6517b79
TB		 2588 read_lock_irqsave(&sg_index_lock, iflags);
2589 sdp = it ? sg_lookup_dev(it->index) : NULL;
1f962ebc
VC		 2590 if (sdp) {
2591 spin_lock(&sdp->sfd_lock);
2592 if (!list_empty(&sdp->sfds)) {
2593 struct scsi_device *scsidp = sdp->device;
1da177e4 2594
1f962ebc
VC		 2595 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2596 if (sdp->detached)
2597 seq_printf(s, "detached pending close ");
2598 else
2599 seq_printf
2600 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2601 scsidp->host->host_no,
2602 scsidp->channel, scsidp->id,
2603 scsidp->lun,
2604 scsidp->host->hostt->emulated);
2605 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2606 sdp->sg_tablesize, sdp->exclude);
2607 sg_proc_debug_helper(s, sdp);
2608 }
2609 spin_unlock(&sdp->sfd_lock);
1da177e4 2610 }
c6517b79 2611 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2612 return 0;
2613}
2614
2615#endif /* CONFIG_SCSI_PROC_FS */
2616
2617module_init(init_sg);
2618module_exit(exit_sg);
Linux kernel - Deliverables
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