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[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>
38#include <linux/errno.h>
39#include <linux/mtio.h>
40#include <linux/ioctl.h>
5a0e3ad6 41#include <linux/slab.h>
1da177e4
LT		 42#include <linux/fcntl.h>
43#include <linux/init.h>
44#include <linux/poll.h>
1da177e4 45#include <linux/moduleparam.h>
1da177e4 46#include <linux/cdev.h>
7c07d613 47#include <linux/idr.h>
1da177e4
LT		 48#include <linux/seq_file.h>
49#include <linux/blkdev.h>
50#include <linux/delay.h>
6da127ad 51#include <linux/blktrace_api.h>
eb09d3d4 52#include <linux/smp_lock.h>
1da177e4
LT		 53
54#include "scsi.h"
db9dff36 55#include <scsi/scsi_dbg.h>
1da177e4
LT		 56#include <scsi/scsi_host.h>
57#include <scsi/scsi_driver.h>
58#include <scsi/scsi_ioctl.h>
59#include <scsi/sg.h>
60
61#include "scsi_logging.h"
62
63#ifdef CONFIG_SCSI_PROC_FS
64#include <linux/proc_fs.h>
7ca63cb4 65static char *sg_version_date = "20061027";
1da177e4
LT		 66
67static int sg_proc_init(void);
68static void sg_proc_cleanup(void);
69#endif
70
1da177e4 71#define SG_ALLOW_DIO_DEF 0
1da177e4
LT		 72
73#define SG_MAX_DEVS 32768
74
75/*
76 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
77 * Then when using 32 bit integers x * m may overflow during the calculation.
78 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
79 * calculates the same, but prevents the overflow when both m and d
80 * are "small" numbers (like HZ and USER_HZ).
81 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
82 * in 32 bits.
83 */
84#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
85
86#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
87
88int sg_big_buff = SG_DEF_RESERVED_SIZE;
89/* N.B. This variable is readable and writeable via
90 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
91 of this size (or less if there is not enough memory) will be reserved
92 for use by this file descriptor. [Deprecated usage: this variable is also
93 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
94 the kernel (i.e. it is not a module).] */
95static int def_reserved_size = -1; /* picks up init parameter */
96static int sg_allow_dio = SG_ALLOW_DIO_DEF;
97
6460e75a
DG		 98static int scatter_elem_sz = SG_SCATTER_SZ;
99static int scatter_elem_sz_prev = SG_SCATTER_SZ;
100
1da177e4 101#define SG_SECTOR_SZ 512
1da177e4 102
ee959b00
TJ		 103static int sg_add(struct device *, struct class_interface *);
104static void sg_remove(struct device *, struct class_interface *);
1da177e4 105
7c07d613
JB		 106static DEFINE_IDR(sg_index_idr);
107static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
1da177e4
LT		 108 file descriptor list for device */
109
110static struct class_interface sg_interface = {
ee959b00
TJ		 111 .add_dev = sg_add,
112 .remove_dev = sg_remove,
1da177e4
LT		 113};
114
115typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
116 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 117 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4 118 unsigned bufflen; /* Size of (aggregate) data buffer */
10db10d1
FT		 119 struct page **pages;
120 int page_order;
1da177e4
LT		 121 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
122 unsigned char cmd_opcode; /* first byte of command */
123} Sg_scatter_hold;
124
125struct sg_device; /* forward declarations */
126struct sg_fd;
127
128typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 129 struct sg_request *nextrp; /* NULL -> tail request (slist) */
130 struct sg_fd *parentfp; /* NULL -> not in use */
131 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
132 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 133 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 134 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
135 char orphan; /* 1 -> drop on sight, 0 -> normal */
136 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
137 volatile char done; /* 0->before bh, 1->before read, 2->read */
10865dfa 138 struct request *rq;
6e5a30cb 139 struct bio *bio;
c96952ed 140 struct execute_work ew;
1da177e4
LT		 141} Sg_request;
142
143typedef struct sg_fd { /* holds the state of a file descriptor */
3442f802 144 struct list_head sfd_siblings;
1da177e4
LT		 145 struct sg_device *parentdp; /* owning device */
146 wait_queue_head_t read_wait; /* queue read until command done */
147 rwlock_t rq_list_lock; /* protect access to list in req_arr */
148 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
149 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
150 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
151 unsigned save_scat_len; /* original length of trunc. scat. element */
152 Sg_request *headrp; /* head of request slist, NULL->empty */
153 struct fasync_struct *async_qp; /* used by asynchronous notification */
154 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
155 char low_dma; /* as in parent but possibly overridden to 1 */
156 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
157 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
158 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
159 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
160 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
161 char mmap_called; /* 0 -> mmap() never called on this fd */
c6517b79
TB		 162 struct kref f_ref;
163 struct execute_work ew;
1da177e4
LT		 164} Sg_fd;
165
166typedef struct sg_device { /* holds the state of each scsi generic device */
167 struct scsi_device *device;
168 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
169 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 170 u32 index; /* device index number */
3442f802 171 struct list_head sfds;
1da177e4
LT		 172 volatile char detached; /* 0->attached, 1->detached pending removal */
173 volatile char exclude; /* opened for exclusive access */
174 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
175 struct gendisk *disk;
176 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
c6517b79 177 struct kref d_ref;
1da177e4
LT		 178} Sg_device;
179
d6b10348 180/* tasklet or soft irq callback */
a91a3a20 181static void sg_rq_end_io(struct request *rq, int uptodate);
10865dfa 182static int sg_start_req(Sg_request *srp, unsigned char *cmd);
e7ee4cc0 183static int sg_finish_rem_req(Sg_request * srp);
1da177e4 184static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
1da177e4
LT		 185static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
186 Sg_request * srp);
0b07de85
AG		 187static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
188 const char __user *buf, size_t count, int blocking,
a2dd3b4c 189 int read_only, int sg_io_owned, Sg_request **o_srp);
1da177e4
LT		 190static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
191 unsigned char *cmnd, int timeout, int blocking);
1da177e4
LT		 192static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
193static void sg_remove_scat(Sg_scatter_hold * schp);
194static void sg_build_reserve(Sg_fd * sfp, int req_size);
195static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
196static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
1da177e4 197static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
c6517b79 198static void sg_remove_sfp(struct kref *);
1da177e4
LT		 199static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
200static Sg_request *sg_add_request(Sg_fd * sfp);
201static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
202static int sg_res_in_use(Sg_fd * sfp);
1da177e4 203static Sg_device *sg_get_dev(int dev);
c6517b79 204static void sg_put_dev(Sg_device *sdp);
1da177e4 205
1da177e4
LT		 206#define SZ_SG_HEADER sizeof(struct sg_header)
207#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
208#define SZ_SG_IOVEC sizeof(sg_iovec_t)
209#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
210
14e507b8
FT		 211static int sg_allow_access(struct file *filp, unsigned char *cmd)
212{
213 struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
14e507b8
FT		 214
215 if (sfp->parentdp->device->type == TYPE_SCANNER)
216 return 0;
217
018e0446 218 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
14e507b8
FT		 219}
220
1da177e4
LT		 221static int
222sg_open(struct inode *inode, struct file *filp)
223{
224 int dev = iminor(inode);
225 int flags = filp->f_flags;
d6b10348 226 struct request_queue *q;
1da177e4
LT		 227 Sg_device *sdp;
228 Sg_fd *sfp;
229 int res;
230 int retval;
231
eb09d3d4 232 lock_kernel();
1da177e4
LT		 233 nonseekable_open(inode, filp);
234 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
235 sdp = sg_get_dev(dev);
c6517b79
TB		 236 if (IS_ERR(sdp)) {
237 retval = PTR_ERR(sdp);
238 sdp = NULL;
239 goto sg_put;
eb09d3d4 240 }
1da177e4
LT		 241
242 /* This driver's module count bumped by fops_get in <linux/fs.h> */
243 /* Prevent the device driver from vanishing while we sleep */
244 retval = scsi_device_get(sdp->device);
c6517b79
TB		 245 if (retval)
246 goto sg_put;
1da177e4 247
bc4f2401
AS		 248 retval = scsi_autopm_get_device(sdp->device);
249 if (retval)
250 goto sdp_put;
251
1da177e4
LT		 252 if (!((flags & O_NONBLOCK) ||
253 scsi_block_when_processing_errors(sdp->device))) {
254 retval = -ENXIO;
255 /* we are in error recovery for this device */
256 goto error_out;
257 }
258
259 if (flags & O_EXCL) {
260 if (O_RDONLY == (flags & O_ACCMODE)) {
261 retval = -EPERM; /* Can't lock it with read only access */
262 goto error_out;
263 }
3442f802 264 if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) {
1da177e4
LT		 265 retval = -EBUSY;
266 goto error_out;
267 }
268 res = 0;
269 __wait_event_interruptible(sdp->o_excl_wait,
3442f802 270 ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
1da177e4
LT		 271 if (res) {
272 retval = res; /* -ERESTARTSYS because signal hit process */
273 goto error_out;
274 }
275 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
276 if (flags & O_NONBLOCK) {
277 retval = -EBUSY;
278 goto error_out;
279 }
280 res = 0;
281 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
282 res);
283 if (res) {
284 retval = res; /* -ERESTARTSYS because signal hit process */
285 goto error_out;
286 }
287 }
288 if (sdp->detached) {
289 retval = -ENODEV;
290 goto error_out;
291 }
3442f802 292 if (list_empty(&sdp->sfds)) { /* no existing opens on this device */
1da177e4 293 sdp->sgdebug = 0;
d6b10348 294 q = sdp->device->request_queue;
8a78362c 295 sdp->sg_tablesize = queue_max_segments(q);
1da177e4
LT		 296 }
297 if ((sfp = sg_add_sfp(sdp, dev)))
298 filp->private_data = sfp;
299 else {
c6517b79 300 if (flags & O_EXCL) {
1da177e4 301 sdp->exclude = 0; /* undo if error */
c6517b79
TB		 302 wake_up_interruptible(&sdp->o_excl_wait);
303 }
1da177e4
LT		 304 retval = -ENOMEM;
305 goto error_out;
306 }
c6517b79
TB		 307 retval = 0;
308error_out:
bc4f2401
AS		 309 if (retval) {
310 scsi_autopm_put_device(sdp->device);
311sdp_put:
c6517b79 312 scsi_device_put(sdp->device);
bc4f2401 313 }
c6517b79
TB		 314sg_put:
315 if (sdp)
316 sg_put_dev(sdp);
eb09d3d4 317 unlock_kernel();
1da177e4
LT		 318 return retval;
319}
320
321/* Following function was formerly called 'sg_close' */
322static int
323sg_release(struct inode *inode, struct file *filp)
324{
325 Sg_device *sdp;
326 Sg_fd *sfp;
327
328 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
329 return -ENXIO;
330 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
c6517b79
TB		 331
332 sfp->closed = 1;
333
334 sdp->exclude = 0;
335 wake_up_interruptible(&sdp->o_excl_wait);
336
bc4f2401 337 scsi_autopm_put_device(sdp->device);
c6517b79 338 kref_put(&sfp->f_ref, sg_remove_sfp);
1da177e4
LT		 339 return 0;
340}
341
342static ssize_t
343sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
344{
1da177e4
LT		 345 Sg_device *sdp;
346 Sg_fd *sfp;
347 Sg_request *srp;
348 int req_pack_id = -1;
1da177e4 349 sg_io_hdr_t *hp;
cb59e840 350 struct sg_header *old_hdr = NULL;
351 int retval = 0;
1da177e4
LT		 352
353 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
354 return -ENXIO;
355 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
356 sdp->disk->disk_name, (int) count));
d6b10348 357
1da177e4
LT		 358 if (!access_ok(VERIFY_WRITE, buf, count))
359 return -EFAULT;
360 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840 361 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
362 if (!old_hdr)
363 return -ENOMEM;
364 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
365 retval = -EFAULT;
366 goto free_old_hdr;
367 }
368 if (old_hdr->reply_len < 0) {
1da177e4 369 if (count >= SZ_SG_IO_HDR) {
cb59e840 370 sg_io_hdr_t *new_hdr;
371 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
372 if (!new_hdr) {
373 retval = -ENOMEM;
374 goto free_old_hdr;
375 }
376 retval =__copy_from_user
377 (new_hdr, buf, SZ_SG_IO_HDR);
378 req_pack_id = new_hdr->pack_id;
379 kfree(new_hdr);
380 if (retval) {
381 retval = -EFAULT;
382 goto free_old_hdr;
383 }
1da177e4
LT		 384 }
385 } else
cb59e840 386 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 387 }
388 srp = sg_get_rq_mark(sfp, req_pack_id);
389 if (!srp) { /* now wait on packet to arrive */
cb59e840 390 if (sdp->detached) {
391 retval = -ENODEV;
392 goto free_old_hdr;
393 }
394 if (filp->f_flags & O_NONBLOCK) {
395 retval = -EAGAIN;
396 goto free_old_hdr;
397 }
1da177e4 398 while (1) {
cb59e840 399 retval = 0; /* following macro beats race condition */
1da177e4 400 __wait_event_interruptible(sfp->read_wait,
cb59e840 401 (sdp->detached ||
402 (srp = sg_get_rq_mark(sfp, req_pack_id))),
403 retval);
404 if (sdp->detached) {
405 retval = -ENODEV;
406 goto free_old_hdr;
407 }
408 if (0 == retval)
1da177e4 409 break;
cb59e840 410
411 /* -ERESTARTSYS as signal hit process */
412 goto free_old_hdr;
1da177e4
LT		 413 }
414 }
cb59e840 415 if (srp->header.interface_id != '\0') {
416 retval = sg_new_read(sfp, buf, count, srp);
417 goto free_old_hdr;
418 }
1da177e4
LT		 419
420 hp = &srp->header;
cb59e840 421 if (old_hdr == NULL) {
422 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
423 if (! old_hdr) {
424 retval = -ENOMEM;
425 goto free_old_hdr;
426 }
427 }
428 memset(old_hdr, 0, SZ_SG_HEADER);
429 old_hdr->reply_len = (int) hp->timeout;
430 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
431 old_hdr->pack_id = hp->pack_id;
432 old_hdr->twelve_byte =
1da177e4 433 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840 434 old_hdr->target_status = hp->masked_status;
435 old_hdr->host_status = hp->host_status;
436 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 437 if ((CHECK_CONDITION & hp->masked_status) ||
438 (DRIVER_SENSE & hp->driver_status))
cb59e840 439 memcpy(old_hdr->sense_buffer, srp->sense_b,
440 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 441 switch (hp->host_status) {
442 /* This setup of 'result' is for backward compatibility and is best
443 ignored by the user who should use target, host + driver status */
444 case DID_OK:
445 case DID_PASSTHROUGH:
446 case DID_SOFT_ERROR:
cb59e840 447 old_hdr->result = 0;
1da177e4
LT		 448 break;
449 case DID_NO_CONNECT:
450 case DID_BUS_BUSY:
451 case DID_TIME_OUT:
cb59e840 452 old_hdr->result = EBUSY;
1da177e4
LT		 453 break;
454 case DID_BAD_TARGET:
455 case DID_ABORT:
456 case DID_PARITY:
457 case DID_RESET:
458 case DID_BAD_INTR:
cb59e840 459 old_hdr->result = EIO;
1da177e4
LT		 460 break;
461 case DID_ERROR:
cb59e840 462 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 463 hp->masked_status == GOOD) ? 0 : EIO;
464 break;
465 default:
cb59e840 466 old_hdr->result = EIO;
1da177e4
LT		 467 break;
468 }
469
470 /* Now copy the result back to the user buffer. */
471 if (count >= SZ_SG_HEADER) {
cb59e840 472 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
473 retval = -EFAULT;
474 goto free_old_hdr;
475 }
1da177e4 476 buf += SZ_SG_HEADER;
cb59e840 477 if (count > old_hdr->reply_len)
478 count = old_hdr->reply_len;
1da177e4 479 if (count > SZ_SG_HEADER) {
cb59e840 480 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
481 retval = -EFAULT;
482 goto free_old_hdr;
483 }
1da177e4
LT		 484 }
485 } else
cb59e840 486 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 487 sg_finish_rem_req(srp);
cb59e840 488 retval = count;
489free_old_hdr:
c9475cb0 490 kfree(old_hdr);
cb59e840 491 return retval;
1da177e4
LT		 492}
493
494static ssize_t
495sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
496{
497 sg_io_hdr_t *hp = &srp->header;
498 int err = 0;
499 int len;
500
501 if (count < SZ_SG_IO_HDR) {
502 err = -EINVAL;
503 goto err_out;
504 }
505 hp->sb_len_wr = 0;
506 if ((hp->mx_sb_len > 0) && hp->sbp) {
507 if ((CHECK_CONDITION & hp->masked_status) ||
508 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 509 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 510 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
511 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
512 len = (len > sb_len) ? sb_len : len;
513 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
514 err = -EFAULT;
515 goto err_out;
516 }
517 hp->sb_len_wr = len;
518 }
519 }
520 if (hp->masked_status || hp->host_status || hp->driver_status)
521 hp->info |= SG_INFO_CHECK;
522 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
523 err = -EFAULT;
524 goto err_out;
525 }
0b6cb26c 526err_out:
e7ee4cc0 527 err = sg_finish_rem_req(srp);
1da177e4
LT		 528 return (0 == err) ? count : err;
529}
530
531static ssize_t
532sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
533{
534 int mxsize, cmd_size, k;
535 int input_size, blocking;
536 unsigned char opcode;
537 Sg_device *sdp;
538 Sg_fd *sfp;
539 Sg_request *srp;
540 struct sg_header old_hdr;
541 sg_io_hdr_t *hp;
d6b10348 542 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 543
544 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
545 return -ENXIO;
546 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
547 sdp->disk->disk_name, (int) count));
548 if (sdp->detached)
549 return -ENODEV;
550 if (!((filp->f_flags & O_NONBLOCK) ||
551 scsi_block_when_processing_errors(sdp->device)))
552 return -ENXIO;
553
554 if (!access_ok(VERIFY_READ, buf, count))
555 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
556 if (count < SZ_SG_HEADER)
557 return -EIO;
558 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
559 return -EFAULT;
560 blocking = !(filp->f_flags & O_NONBLOCK);
561 if (old_hdr.reply_len < 0)
a2dd3b4c
TB		 562 return sg_new_write(sfp, filp, buf, count,
563 blocking, 0, 0, NULL);
1da177e4
LT		 564 if (count < (SZ_SG_HEADER + 6))
565 return -EIO; /* The minimum scsi command length is 6 bytes. */
566
567 if (!(srp = sg_add_request(sfp))) {
568 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
569 return -EDOM;
570 }
571 buf += SZ_SG_HEADER;
572 __get_user(opcode, buf);
573 if (sfp->next_cmd_len > 0) {
574 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
575 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
576 sfp->next_cmd_len = 0;
577 sg_remove_request(sfp, srp);
578 return -EIO;
579 }
580 cmd_size = sfp->next_cmd_len;
581 sfp->next_cmd_len = 0; /* reset so only this write() effected */
582 } else {
583 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
584 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
585 cmd_size = 12;
586 }
587 SCSI_LOG_TIMEOUT(4, printk(
588 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
589/* Determine buffer size. */
590 input_size = count - cmd_size;
591 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
592 mxsize -= SZ_SG_HEADER;
593 input_size -= SZ_SG_HEADER;
594 if (input_size < 0) {
595 sg_remove_request(sfp, srp);
596 return -EIO; /* User did not pass enough bytes for this command. */
597 }
598 hp = &srp->header;
599 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
600 hp->cmd_len = (unsigned char) cmd_size;
601 hp->iovec_count = 0;
602 hp->mx_sb_len = 0;
603 if (input_size > 0)
604 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
605 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
606 else
607 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
608 hp->dxfer_len = mxsize;
fad7f01e
FT		 609 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
610 hp->dxferp = (char __user *)buf + cmd_size;
611 else
612 hp->dxferp = NULL;
1da177e4
LT		 613 hp->sbp = NULL;
614 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
615 hp->flags = input_size; /* structure abuse ... */
616 hp->pack_id = old_hdr.pack_id;
617 hp->usr_ptr = NULL;
618 if (__copy_from_user(cmnd, buf, cmd_size))
619 return -EFAULT;
620 /*
621 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
622 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
623 * is a non-zero input_size, so emit a warning.
624 */
eaa3e22e
AK		 625 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
626 static char cmd[TASK_COMM_LEN];
627 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
1da177e4
LT		 628 printk(KERN_WARNING
629 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
ad361c98 630 "guessing data in;\n "
1da177e4
LT		 631 "program %s not setting count and/or reply_len properly\n",
632 old_hdr.reply_len - (int)SZ_SG_HEADER,
633 input_size, (unsigned int) cmnd[0],
634 current->comm);
eaa3e22e
AK		 635 strcpy(cmd, current->comm);
636 }
637 }
1da177e4
LT		 638 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
639 return (k < 0) ? k : count;
640}
641
642static ssize_t
0b07de85 643sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
a2dd3b4c 644 size_t count, int blocking, int read_only, int sg_io_owned,
0b07de85 645 Sg_request **o_srp)
1da177e4
LT		 646{
647 int k;
648 Sg_request *srp;
649 sg_io_hdr_t *hp;
d6b10348 650 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 651 int timeout;
652 unsigned long ul_timeout;
653
654 if (count < SZ_SG_IO_HDR)
655 return -EINVAL;
656 if (!access_ok(VERIFY_READ, buf, count))
657 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
658
659 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
660 if (!(srp = sg_add_request(sfp))) {
661 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
662 return -EDOM;
663 }
a2dd3b4c 664 srp->sg_io_owned = sg_io_owned;
1da177e4
LT		 665 hp = &srp->header;
666 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
667 sg_remove_request(sfp, srp);
668 return -EFAULT;
669 }
670 if (hp->interface_id != 'S') {
671 sg_remove_request(sfp, srp);
672 return -ENOSYS;
673 }
674 if (hp->flags & SG_FLAG_MMAP_IO) {
675 if (hp->dxfer_len > sfp->reserve.bufflen) {
676 sg_remove_request(sfp, srp);
677 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
678 }
679 if (hp->flags & SG_FLAG_DIRECT_IO) {
680 sg_remove_request(sfp, srp);
681 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
682 }
683 if (sg_res_in_use(sfp)) {
684 sg_remove_request(sfp, srp);
685 return -EBUSY; /* reserve buffer already being used */
686 }
687 }
688 ul_timeout = msecs_to_jiffies(srp->header.timeout);
689 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
690 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
691 sg_remove_request(sfp, srp);
692 return -EMSGSIZE;
693 }
694 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
695 sg_remove_request(sfp, srp);
696 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
697 }
698 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
699 sg_remove_request(sfp, srp);
700 return -EFAULT;
701 }
14e507b8 702 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 703 sg_remove_request(sfp, srp);
704 return -EPERM;
705 }
706 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
707 if (k < 0)
708 return k;
709 if (o_srp)
710 *o_srp = srp;
711 return count;
712}
713
714static int
715sg_common_write(Sg_fd * sfp, Sg_request * srp,
716 unsigned char *cmnd, int timeout, int blocking)
717{
d6b10348 718 int k, data_dir;
1da177e4
LT		 719 Sg_device *sdp = sfp->parentdp;
720 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 721
722 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
723 hp->status = 0;
724 hp->masked_status = 0;
725 hp->msg_status = 0;
726 hp->info = 0;
727 hp->host_status = 0;
728 hp->driver_status = 0;
729 hp->resid = 0;
730 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
731 (int) cmnd[0], (int) hp->cmd_len));
732
10865dfa
FT		 733 k = sg_start_req(srp, cmnd);
734 if (k) {
7ca63cb4 735 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 736 sg_finish_rem_req(srp);
737 return k; /* probably out of space --> ENOMEM */
738 }
1da177e4 739 if (sdp->detached) {
caf19d38
FT		 740 if (srp->bio)
741 blk_end_request_all(srp->rq, -EIO);
1da177e4
LT		 742 sg_finish_rem_req(srp);
743 return -ENODEV;
744 }
1da177e4 745
1da177e4
LT		 746 switch (hp->dxfer_direction) {
747 case SG_DXFER_TO_FROM_DEV:
748 case SG_DXFER_FROM_DEV:
d6b10348 749 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 750 break;
751 case SG_DXFER_TO_DEV:
d6b10348 752 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 753 break;
754 case SG_DXFER_UNKNOWN:
d6b10348 755 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 756 break;
757 default:
d6b10348 758 data_dir = DMA_NONE;
1da177e4
LT		 759 break;
760 }
cb59e840 761 hp->duration = jiffies_to_msecs(jiffies);
10db10d1
FT		 762
763 srp->rq->timeout = timeout;
c6517b79 764 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
10db10d1
FT		 765 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
766 srp->rq, 1, sg_rq_end_io);
767 return 0;
1da177e4
LT		 768}
769
1da177e4 770static int
f4927c45 771sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 772{
773 void __user *p = (void __user *)arg;
774 int __user *ip = p;
775 int result, val, read_only;
776 Sg_device *sdp;
777 Sg_fd *sfp;
778 Sg_request *srp;
779 unsigned long iflags;
780
781 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
782 return -ENXIO;
abf54393 783
1da177e4
LT		 784 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
785 sdp->disk->disk_name, (int) cmd_in));
786 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
787
788 switch (cmd_in) {
789 case SG_IO:
790 {
791 int blocking = 1; /* ignore O_NONBLOCK flag */
792
793 if (sdp->detached)
794 return -ENODEV;
795 if (!scsi_block_when_processing_errors(sdp->device))
796 return -ENXIO;
797 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
798 return -EFAULT;
799 result =
0b07de85 800 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
a2dd3b4c 801 blocking, read_only, 1, &srp);
1da177e4
LT		 802 if (result < 0)
803 return result;
1da177e4
LT		 804 while (1) {
805 result = 0; /* following macro to beat race condition */
806 __wait_event_interruptible(sfp->read_wait,
a2dd3b4c
TB		 807 (srp->done || sdp->detached),
808 result);
1da177e4
LT		 809 if (sdp->detached)
810 return -ENODEV;
a2dd3b4c
TB		 811 write_lock_irq(&sfp->rq_list_lock);
812 if (srp->done) {
813 srp->done = 2;
814 write_unlock_irq(&sfp->rq_list_lock);
1da177e4 815 break;
a2dd3b4c 816 }
1da177e4 817 srp->orphan = 1;
a2dd3b4c 818 write_unlock_irq(&sfp->rq_list_lock);
1da177e4
LT		 819 return result; /* -ERESTARTSYS because signal hit process */
820 }
1da177e4
LT		 821 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
822 return (result < 0) ? result : 0;
823 }
824 case SG_SET_TIMEOUT:
825 result = get_user(val, ip);
826 if (result)
827 return result;
828 if (val < 0)
829 return -EIO;
830 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
831 val = MULDIV (INT_MAX, USER_HZ, HZ);
832 sfp->timeout_user = val;
833 sfp->timeout = MULDIV (val, HZ, USER_HZ);
834
835 return 0;
836 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
837 /* strange ..., for backward compatibility */
838 return sfp->timeout_user;
839 case SG_SET_FORCE_LOW_DMA:
840 result = get_user(val, ip);
841 if (result)
842 return result;
843 if (val) {
844 sfp->low_dma = 1;
845 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
846 val = (int) sfp->reserve.bufflen;
847 sg_remove_scat(&sfp->reserve);
848 sg_build_reserve(sfp, val);
849 }
850 } else {
851 if (sdp->detached)
852 return -ENODEV;
853 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
854 }
855 return 0;
856 case SG_GET_LOW_DMA:
857 return put_user((int) sfp->low_dma, ip);
858 case SG_GET_SCSI_ID:
859 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
860 return -EFAULT;
861 else {
862 sg_scsi_id_t __user *sg_idp = p;
863
864 if (sdp->detached)
865 return -ENODEV;
866 __put_user((int) sdp->device->host->host_no,
867 &sg_idp->host_no);
868 __put_user((int) sdp->device->channel,
869 &sg_idp->channel);
870 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
871 __put_user((int) sdp->device->lun, &sg_idp->lun);
872 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
873 __put_user((short) sdp->device->host->cmd_per_lun,
874 &sg_idp->h_cmd_per_lun);
875 __put_user((short) sdp->device->queue_depth,
876 &sg_idp->d_queue_depth);
877 __put_user(0, &sg_idp->unused[0]);
878 __put_user(0, &sg_idp->unused[1]);
879 return 0;
880 }
881 case SG_SET_FORCE_PACK_ID:
882 result = get_user(val, ip);
883 if (result)
884 return result;
885 sfp->force_packid = val ? 1 : 0;
886 return 0;
887 case SG_GET_PACK_ID:
888 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
889 return -EFAULT;
890 read_lock_irqsave(&sfp->rq_list_lock, iflags);
891 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
892 if ((1 == srp->done) && (!srp->sg_io_owned)) {
893 read_unlock_irqrestore(&sfp->rq_list_lock,
894 iflags);
895 __put_user(srp->header.pack_id, ip);
896 return 0;
897 }
898 }
899 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
900 __put_user(-1, ip);
901 return 0;
902 case SG_GET_NUM_WAITING:
903 read_lock_irqsave(&sfp->rq_list_lock, iflags);
904 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
905 if ((1 == srp->done) && (!srp->sg_io_owned))
906 ++val;
907 }
908 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
909 return put_user(val, ip);
910 case SG_GET_SG_TABLESIZE:
911 return put_user(sdp->sg_tablesize, ip);
912 case SG_SET_RESERVED_SIZE:
913 result = get_user(val, ip);
914 if (result)
915 return result;
916 if (val < 0)
917 return -EINVAL;
44ec9542 918 val = min_t(int, val,
ae03bf63 919 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 920 if (val != sfp->reserve.bufflen) {
921 if (sg_res_in_use(sfp) || sfp->mmap_called)
922 return -EBUSY;
923 sg_remove_scat(&sfp->reserve);
924 sg_build_reserve(sfp, val);
925 }
926 return 0;
927 case SG_GET_RESERVED_SIZE:
44ec9542 928 val = min_t(int, sfp->reserve.bufflen,
ae03bf63 929 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 930 return put_user(val, ip);
931 case SG_SET_COMMAND_Q:
932 result = get_user(val, ip);
933 if (result)
934 return result;
935 sfp->cmd_q = val ? 1 : 0;
936 return 0;
937 case SG_GET_COMMAND_Q:
938 return put_user((int) sfp->cmd_q, ip);
939 case SG_SET_KEEP_ORPHAN:
940 result = get_user(val, ip);
941 if (result)
942 return result;
943 sfp->keep_orphan = val;
944 return 0;
945 case SG_GET_KEEP_ORPHAN:
946 return put_user((int) sfp->keep_orphan, ip);
947 case SG_NEXT_CMD_LEN:
948 result = get_user(val, ip);
949 if (result)
950 return result;
951 sfp->next_cmd_len = (val > 0) ? val : 0;
952 return 0;
953 case SG_GET_VERSION_NUM:
954 return put_user(sg_version_num, ip);
955 case SG_GET_ACCESS_COUNT:
956 /* faked - we don't have a real access count anymore */
957 val = (sdp->device ? 1 : 0);
958 return put_user(val, ip);
959 case SG_GET_REQUEST_TABLE:
960 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
961 return -EFAULT;
962 else {
cb59e840 963 sg_req_info_t *rinfo;
964 unsigned int ms;
965
966 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
967 GFP_KERNEL);
968 if (!rinfo)
969 return -ENOMEM;
1da177e4
LT		 970 read_lock_irqsave(&sfp->rq_list_lock, iflags);
971 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
972 ++val, srp = srp ? srp->nextrp : srp) {
973 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
974 if (srp) {
975 rinfo[val].req_state = srp->done + 1;
976 rinfo[val].problem =
977 srp->header.masked_status &
978 srp->header.host_status &
979 srp->header.driver_status;
cb59e840 980 if (srp->done)
981 rinfo[val].duration =
982 srp->header.duration;
983 else {
984 ms = jiffies_to_msecs(jiffies);
985 rinfo[val].duration =
986 (ms > srp->header.duration) ?
987 (ms - srp->header.duration) : 0;
988 }
1da177e4 989 rinfo[val].orphan = srp->orphan;
cb59e840 990 rinfo[val].sg_io_owned =
991 srp->sg_io_owned;
992 rinfo[val].pack_id =
993 srp->header.pack_id;
994 rinfo[val].usr_ptr =
995 srp->header.usr_ptr;
1da177e4
LT		 996 }
997 }
998 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840 999 result = __copy_to_user(p, rinfo,
1000 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1001 result = result ? -EFAULT : 0;
1002 kfree(rinfo);
1003 return result;
1da177e4
LT		 1004 }
1005 case SG_EMULATED_HOST:
1006 if (sdp->detached)
1007 return -ENODEV;
1008 return put_user(sdp->device->host->hostt->emulated, ip);
1009 case SG_SCSI_RESET:
1010 if (sdp->detached)
1011 return -ENODEV;
1012 if (filp->f_flags & O_NONBLOCK) {
939647ee 1013 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1014 return -EBUSY;
1015 } else if (!scsi_block_when_processing_errors(sdp->device))
1016 return -EBUSY;
1017 result = get_user(val, ip);
1018 if (result)
1019 return result;
1020 if (SG_SCSI_RESET_NOTHING == val)
1021 return 0;
1022 switch (val) {
1023 case SG_SCSI_RESET_DEVICE:
1024 val = SCSI_TRY_RESET_DEVICE;
1025 break;
39120e11
BK		 1026 case SG_SCSI_RESET_TARGET:
1027 val = SCSI_TRY_RESET_TARGET;
1028 break;
1da177e4
LT		 1029 case SG_SCSI_RESET_BUS:
1030 val = SCSI_TRY_RESET_BUS;
1031 break;
1032 case SG_SCSI_RESET_HOST:
1033 val = SCSI_TRY_RESET_HOST;
1034 break;
1035 default:
1036 return -EINVAL;
1037 }
1038 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1039 return -EACCES;
1040 return (scsi_reset_provider(sdp->device, val) ==
1041 SUCCESS) ? 0 : -EIO;
1042 case SCSI_IOCTL_SEND_COMMAND:
1043 if (sdp->detached)
1044 return -ENODEV;
1045 if (read_only) {
1046 unsigned char opcode = WRITE_6;
1047 Scsi_Ioctl_Command __user *siocp = p;
1048
1049 if (copy_from_user(&opcode, siocp->data, 1))
1050 return -EFAULT;
14e507b8 1051 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1052 return -EPERM;
1053 }
e915e872 1054 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1da177e4
LT		 1055 case SG_SET_DEBUG:
1056 result = get_user(val, ip);
1057 if (result)
1058 return result;
1059 sdp->sgdebug = (char) val;
1060 return 0;
1061 case SCSI_IOCTL_GET_IDLUN:
1062 case SCSI_IOCTL_GET_BUS_NUMBER:
1063 case SCSI_IOCTL_PROBE_HOST:
1064 case SG_GET_TRANSFORM:
1065 if (sdp->detached)
1066 return -ENODEV;
1067 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542 1068 case BLKSECTGET:
ae03bf63 1069 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
44ec9542 1070 ip);
6da127ad
CS		 1071 case BLKTRACESETUP:
1072 return blk_trace_setup(sdp->device->request_queue,
1073 sdp->disk->disk_name,
76e3a19d 1074 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
d0deef5b 1075 NULL,
6da127ad
CS		 1076 (char *)arg);
1077 case BLKTRACESTART:
1078 return blk_trace_startstop(sdp->device->request_queue, 1);
1079 case BLKTRACESTOP:
1080 return blk_trace_startstop(sdp->device->request_queue, 0);
1081 case BLKTRACETEARDOWN:
1082 return blk_trace_remove(sdp->device->request_queue);
1da177e4
LT		 1083 default:
1084 if (read_only)
1085 return -EPERM; /* don't know so take safe approach */
1086 return scsi_ioctl(sdp->device, cmd_in, p);
1087 }
1088}
1089
f4927c45
AB		 1090static long
1091sg_unlocked_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1092{
1093 int ret;
1094
1095 lock_kernel();
1096 ret = sg_ioctl(filp, cmd_in, arg);
1097 unlock_kernel();
1098
1099 return ret;
1100}
1101
1da177e4
LT		 1102#ifdef CONFIG_COMPAT
1103static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1104{
1105 Sg_device *sdp;
1106 Sg_fd *sfp;
1107 struct scsi_device *sdev;
1108
1109 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1110 return -ENXIO;
1111
1112 sdev = sdp->device;
1113 if (sdev->host->hostt->compat_ioctl) {
1114 int ret;
1115
1116 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1117
1118 return ret;
1119 }
1120
1121 return -ENOIOCTLCMD;
1122}
1123#endif
1124
1125static unsigned int
1126sg_poll(struct file *filp, poll_table * wait)
1127{
1128 unsigned int res = 0;
1129 Sg_device *sdp;
1130 Sg_fd *sfp;
1131 Sg_request *srp;
1132 int count = 0;
1133 unsigned long iflags;
1134
1135 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1136 || sfp->closed)
1137 return POLLERR;
1138 poll_wait(filp, &sfp->read_wait, wait);
1139 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1140 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1141 /* if any read waiting, flag it */
1142 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1143 res = POLLIN | POLLRDNORM;
1144 ++count;
1145 }
1146 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1147
1148 if (sdp->detached)
1149 res |= POLLHUP;
1150 else if (!sfp->cmd_q) {
1151 if (0 == count)
1152 res |= POLLOUT | POLLWRNORM;
1153 } else if (count < SG_MAX_QUEUE)
1154 res |= POLLOUT | POLLWRNORM;
1155 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1156 sdp->disk->disk_name, (int) res));
1157 return res;
1158}
1159
1160static int
1161sg_fasync(int fd, struct file *filp, int mode)
1162{
1da177e4
LT		 1163 Sg_device *sdp;
1164 Sg_fd *sfp;
1165
1166 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1167 return -ENXIO;
1168 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1169 sdp->disk->disk_name, mode));
1170
60aa4924 1171 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1da177e4
LT		 1172}
1173
a13ff0bb
NP		 1174static int
1175sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1176{
1177 Sg_fd *sfp;
d6b10348 1178 unsigned long offset, len, sa;
1da177e4 1179 Sg_scatter_hold *rsv_schp;
10db10d1 1180 int k, length;
1da177e4
LT		 1181
1182 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1183 return VM_FAULT_SIGBUS;
1da177e4 1184 rsv_schp = &sfp->reserve;
a13ff0bb 1185 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1186 if (offset >= rsv_schp->bufflen)
a13ff0bb
NP		 1187 return VM_FAULT_SIGBUS;
1188 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1da177e4 1189 offset, rsv_schp->k_use_sg));
d6b10348 1190 sa = vma->vm_start;
10db10d1
FT		 1191 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1192 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1193 len = vma->vm_end - sa;
10db10d1 1194 len = (len < length) ? len : length;
d6b10348 1195 if (offset < len) {
10db10d1
FT		 1196 struct page *page = nth_page(rsv_schp->pages[k],
1197 offset >> PAGE_SHIFT);
d6b10348 1198 get_page(page); /* increment page count */
a13ff0bb
NP		 1199 vmf->page = page;
1200 return 0; /* success */
1da177e4 1201 }
d6b10348
MC		 1202 sa += len;
1203 offset -= len;
1da177e4 1204 }
d6b10348 1205
a13ff0bb 1206 return VM_FAULT_SIGBUS;
1da177e4
LT		 1207}
1208
f0f37e2f 1209static const struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1210 .fault = sg_vma_fault,
1da177e4
LT		 1211};
1212
1213static int
1214sg_mmap(struct file *filp, struct vm_area_struct *vma)
1215{
1216 Sg_fd *sfp;
d6b10348 1217 unsigned long req_sz, len, sa;
1da177e4 1218 Sg_scatter_hold *rsv_schp;
10db10d1 1219 int k, length;
1da177e4
LT		 1220
1221 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1222 return -ENXIO;
cb59e840 1223 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1224 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1225 (void *) vma->vm_start, (int) req_sz));
1226 if (vma->vm_pgoff)
1227 return -EINVAL; /* want no offset */
1228 rsv_schp = &sfp->reserve;
1229 if (req_sz > rsv_schp->bufflen)
1230 return -ENOMEM; /* cannot map more than reserved buffer */
1231
d6b10348 1232 sa = vma->vm_start;
10db10d1
FT		 1233 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1234 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1235 len = vma->vm_end - sa;
10db10d1 1236 len = (len < length) ? len : length;
d6b10348 1237 sa += len;
1da177e4 1238 }
d6b10348 1239
f9aed0e2 1240 sfp->mmap_called = 1;
1c8e71d7 1241 vma->vm_flags |= VM_RESERVED;
1da177e4
LT		 1242 vma->vm_private_data = sfp;
1243 vma->vm_ops = &sg_mmap_vm_ops;
1244 return 0;
1245}
1246
c96952ed
FT		 1247static void sg_rq_end_io_usercontext(struct work_struct *work)
1248{
1249 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1250 struct sg_fd *sfp = srp->parentfp;
1251
1252 sg_finish_rem_req(srp);
1253 kref_put(&sfp->f_ref, sg_remove_sfp);
1254}
1255
a91a3a20
FT		 1256/*
1257 * This function is a "bottom half" handler that is called by the mid
1258 * level when a command is completed (or has failed).
1259 */
1260static void sg_rq_end_io(struct request *rq, int uptodate)
1da177e4 1261{
a91a3a20 1262 struct sg_request *srp = rq->end_io_data;
c6517b79 1263 Sg_device *sdp;
1da177e4 1264 Sg_fd *sfp;
1da177e4 1265 unsigned long iflags;
cb59e840 1266 unsigned int ms;
a91a3a20 1267 char *sense;
c6517b79 1268 int result, resid, done = 1;
1da177e4 1269
c6517b79 1270 if (WARN_ON(srp->done != 0))
1da177e4 1271 return;
c6517b79 1272
1da177e4 1273 sfp = srp->parentfp;
c6517b79 1274 if (WARN_ON(sfp == NULL))
1da177e4 1275 return;
c6517b79
TB		 1276
1277 sdp = sfp->parentdp;
1278 if (unlikely(sdp->detached))
1279 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1da177e4 1280
a91a3a20
FT		 1281 sense = rq->sense;
1282 result = rq->errors;
c3a4d78c 1283 resid = rq->resid_len;
1da177e4
LT		 1284
1285 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1286 sdp->disk->disk_name, srp->header.pack_id, result));
1287 srp->header.resid = resid;
cb59e840 1288 ms = jiffies_to_msecs(jiffies);
1289 srp->header.duration = (ms > srp->header.duration) ?
1290 (ms - srp->header.duration) : 0;
d6b10348 1291 if (0 != result) {
1da177e4
LT		 1292 struct scsi_sense_hdr sshdr;
1293
d6b10348
MC		 1294 srp->header.status = 0xff & result;
1295 srp->header.masked_status = status_byte(result);
1296 srp->header.msg_status = msg_byte(result);
1297 srp->header.host_status = host_byte(result);
1298 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1299 if ((sdp->sgdebug > 0) &&
1300 ((CHECK_CONDITION == srp->header.masked_status) ||
1301 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1302 __scsi_print_sense("sg_cmd_done", sense,
1303 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1304
1305 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1306 if (driver_byte(result) != 0
1307 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1308 && !scsi_sense_is_deferred(&sshdr)
1309 && sshdr.sense_key == UNIT_ATTENTION
1310 && sdp->device->removable) {
1311 /* Detected possible disc change. Set the bit - this */
1312 /* may be used if there are filesystems using this device */
1313 sdp->device->changed = 1;
1314 }
1315 }
1316 /* Rely on write phase to clean out srp status values, so no "else" */
1317
c6517b79
TB		 1318 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1319 if (unlikely(srp->orphan)) {
1da177e4
LT		 1320 if (sfp->keep_orphan)
1321 srp->sg_io_owned = 0;
c6517b79
TB		 1322 else
1323 done = 0;
1da177e4 1324 }
c6517b79
TB		 1325 srp->done = done;
1326 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1327
1328 if (likely(done)) {
1329 /* Now wake up any sg_read() that is waiting for this
1330 * packet.
1331 */
1da177e4 1332 wake_up_interruptible(&sfp->read_wait);
c6517b79 1333 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
c96952ed 1334 kref_put(&sfp->f_ref, sg_remove_sfp);
015640ed
FT		 1335 } else {
1336 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1337 schedule_work(&srp->ew.work);
1338 }
1da177e4
LT		 1339}
1340
828c0950 1341static const struct file_operations sg_fops = {
1da177e4
LT		 1342 .owner = THIS_MODULE,
1343 .read = sg_read,
1344 .write = sg_write,
1345 .poll = sg_poll,
f4927c45 1346 .unlocked_ioctl = sg_unlocked_ioctl,
1da177e4
LT		 1347#ifdef CONFIG_COMPAT
1348 .compat_ioctl = sg_compat_ioctl,
1349#endif
1350 .open = sg_open,
1351 .mmap = sg_mmap,
1352 .release = sg_release,
1353 .fasync = sg_fasync,
6038f373 1354 .llseek = no_llseek,
1da177e4
LT		 1355};
1356
d253878b 1357static struct class *sg_sysfs_class;
1da177e4
LT		 1358
1359static int sg_sysfs_valid = 0;
1360
7c07d613 1361static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1362{
d6b10348 1363 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1364 Sg_device *sdp;
1365 unsigned long iflags;
7c07d613
JB		 1366 int error;
1367 u32 k;
1da177e4 1368
24669f75 1369 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1370 if (!sdp) {
1371 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1372 return ERR_PTR(-ENOMEM);
1373 }
c6517b79 1374
7c07d613
JB		 1375 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1376 printk(KERN_WARNING "idr expansion Sg_device failure\n");
c6517b79 1377 error = -ENOMEM;
7c07d613 1378 goto out;
1da177e4
LT		 1379 }
1380
7c07d613 1381 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4 1382
c6517b79 1383 error = idr_get_new(&sg_index_idr, sdp, &k);
7c07d613 1384 if (error) {
c6517b79 1385 write_unlock_irqrestore(&sg_index_lock, iflags);
7c07d613
JB		 1386 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1387 error);
1388 goto out;
1da177e4
LT		 1389 }
1390
1da177e4
LT		 1391 if (unlikely(k >= SG_MAX_DEVS))
1392 goto overflow;
1393
1da177e4
LT		 1394 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1395 sprintf(disk->disk_name, "sg%d", k);
1396 disk->first_minor = k;
1397 sdp->disk = disk;
1398 sdp->device = scsidp;
3442f802 1399 INIT_LIST_HEAD(&sdp->sfds);
1da177e4 1400 init_waitqueue_head(&sdp->o_excl_wait);
8a78362c 1401 sdp->sg_tablesize = queue_max_segments(q);
7c07d613 1402 sdp->index = k;
c6517b79
TB		 1403 kref_init(&sdp->d_ref);
1404
1405 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 1406
7c07d613 1407 error = 0;
1da177e4 1408 out:
7c07d613 1409 if (error) {
1da177e4 1410 kfree(sdp);
7c07d613
JB		 1411 return ERR_PTR(error);
1412 }
1413 return sdp;
1da177e4
LT		 1414
1415 overflow:
c6517b79
TB		 1416 idr_remove(&sg_index_idr, k);
1417 write_unlock_irqrestore(&sg_index_lock, iflags);
9ccfc756
JB		 1418 sdev_printk(KERN_WARNING, scsidp,
1419 "Unable to attach sg device type=%d, minor "
1420 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1da177e4
LT		 1421 error = -ENODEV;
1422 goto out;
1423}
1424
1425static int
ee959b00 1426sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1427{
ee959b00 1428 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1429 struct gendisk *disk;
1430 Sg_device *sdp = NULL;
1431 struct cdev * cdev = NULL;
7c07d613 1432 int error;
454e8957 1433 unsigned long iflags;
1da177e4
LT		 1434
1435 disk = alloc_disk(1);
1436 if (!disk) {
1437 printk(KERN_WARNING "alloc_disk failed\n");
1438 return -ENOMEM;
1439 }
1440 disk->major = SCSI_GENERIC_MAJOR;
1441
1442 error = -ENOMEM;
1443 cdev = cdev_alloc();
1444 if (!cdev) {
1445 printk(KERN_WARNING "cdev_alloc failed\n");
1446 goto out;
1447 }
1448 cdev->owner = THIS_MODULE;
1449 cdev->ops = &sg_fops;
1450
7c07d613
JB		 1451 sdp = sg_alloc(disk, scsidp);
1452 if (IS_ERR(sdp)) {
1da177e4 1453 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1454 error = PTR_ERR(sdp);
1da177e4
LT		 1455 goto out;
1456 }
1da177e4 1457
7c07d613 1458 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1459 if (error)
454e8957 1460 goto cdev_add_err;
5e3c34c1 1461
1da177e4
LT		 1462 sdp->cdev = cdev;
1463 if (sg_sysfs_valid) {
ee959b00 1464 struct device *sg_class_member;
1da177e4 1465
d73a1a67
GKH		 1466 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1467 MKDEV(SCSI_GENERIC_MAJOR,
1468 sdp->index),
1469 sdp, "%s", disk->disk_name);
d07e0361
FT		 1470 if (IS_ERR(sg_class_member)) {
1471 printk(KERN_ERR "sg_add: "
ee959b00 1472 "device_create failed\n");
d07e0361
FT		 1473 error = PTR_ERR(sg_class_member);
1474 goto cdev_add_err;
1475 }
d07e0361 1476 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1477 &sg_class_member->kobj, "generic");
1478 if (error)
1479 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1480 "'generic' back to sg%d\n", sdp->index);
1da177e4 1481 } else
7c07d613 1482 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1483
9ccfc756 1484 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1485 "Attached scsi generic sg%d type %d\n", sdp->index,
1486 scsidp->type);
1da177e4 1487
ee959b00 1488 dev_set_drvdata(cl_dev, sdp);
a24484f2 1489
1da177e4
LT		 1490 return 0;
1491
454e8957 1492cdev_add_err:
7c07d613
JB		 1493 write_lock_irqsave(&sg_index_lock, iflags);
1494 idr_remove(&sg_index_idr, sdp->index);
1495 write_unlock_irqrestore(&sg_index_lock, iflags);
1496 kfree(sdp);
454e8957 1497
1da177e4
LT		 1498out:
1499 put_disk(disk);
1500 if (cdev)
1501 cdev_del(cdev);
1502 return error;
1503}
1504
c6517b79
TB		 1505static void sg_device_destroy(struct kref *kref)
1506{
1507 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1508 unsigned long flags;
1509
1510 /* CAUTION! Note that the device can still be found via idr_find()
1511 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1512 * any other cleanup.
1513 */
1514
1515 write_lock_irqsave(&sg_index_lock, flags);
1516 idr_remove(&sg_index_idr, sdp->index);
1517 write_unlock_irqrestore(&sg_index_lock, flags);
1518
1519 SCSI_LOG_TIMEOUT(3,
1520 printk("sg_device_destroy: %s\n",
1521 sdp->disk->disk_name));
1522
1523 put_disk(sdp->disk);
1524 kfree(sdp);
1525}
1526
1527static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1528{
ee959b00
TJ		 1529 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1530 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1531 unsigned long iflags;
1532 Sg_fd *sfp;
1da177e4 1533
c6517b79 1534 if (!sdp || sdp->detached)
1da177e4 1535 return;
7c07d613 1536
c6517b79
TB		 1537 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1538
1539 /* Need a write lock to set sdp->detached. */
7c07d613 1540 write_lock_irqsave(&sg_index_lock, iflags);
c6517b79 1541 sdp->detached = 1;
3442f802 1542 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
c6517b79
TB		 1543 wake_up_interruptible(&sfp->read_wait);
1544 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
7c07d613
JB		 1545 }
1546 write_unlock_irqrestore(&sg_index_lock, iflags);
1547
1548 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1549 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1550 cdev_del(sdp->cdev);
1551 sdp->cdev = NULL;
1da177e4 1552
c6517b79 1553 sg_put_dev(sdp);
1da177e4
LT		 1554}
1555
6460e75a
DG		 1556module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1557module_param_named(def_reserved_size, def_reserved_size, int,
1558 S_IRUGO | S_IWUSR);
1da177e4
LT		 1559module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1560
1561MODULE_AUTHOR("Douglas Gilbert");
1562MODULE_DESCRIPTION("SCSI generic (sg) driver");
1563MODULE_LICENSE("GPL");
1564MODULE_VERSION(SG_VERSION_STR);
f018fa55 1565MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1566
6460e75a
DG		 1567MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1568 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1569MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1570MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1571
1572static int __init
1573init_sg(void)
1574{
1575 int rc;
1576
6460e75a
DG		 1577 if (scatter_elem_sz < PAGE_SIZE) {
1578 scatter_elem_sz = PAGE_SIZE;
1579 scatter_elem_sz_prev = scatter_elem_sz;
1580 }
1da177e4
LT		 1581 if (def_reserved_size >= 0)
1582 sg_big_buff = def_reserved_size;
6460e75a
DG		 1583 else
1584 def_reserved_size = sg_big_buff;
1da177e4
LT		 1585
1586 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1587 SG_MAX_DEVS, "sg");
1588 if (rc)
1589 return rc;
d253878b 1590 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1591 if ( IS_ERR(sg_sysfs_class) ) {
1592 rc = PTR_ERR(sg_sysfs_class);
1593 goto err_out;
1594 }
1595 sg_sysfs_valid = 1;
1596 rc = scsi_register_interface(&sg_interface);
1597 if (0 == rc) {
1598#ifdef CONFIG_SCSI_PROC_FS
1599 sg_proc_init();
1600#endif /* CONFIG_SCSI_PROC_FS */
1601 return 0;
1602 }
d253878b 1603 class_destroy(sg_sysfs_class);
1da177e4
LT		 1604err_out:
1605 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1606 return rc;
1607}
1608
1609static void __exit
1610exit_sg(void)
1611{
1612#ifdef CONFIG_SCSI_PROC_FS
1613 sg_proc_cleanup();
1614#endif /* CONFIG_SCSI_PROC_FS */
1615 scsi_unregister_interface(&sg_interface);
d253878b 1616 class_destroy(sg_sysfs_class);
1da177e4
LT		 1617 sg_sysfs_valid = 0;
1618 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1619 SG_MAX_DEVS);
7c07d613 1620 idr_destroy(&sg_index_idr);
1da177e4
LT		 1621}
1622
44c7b0ea 1623static int sg_start_req(Sg_request *srp, unsigned char *cmd)
10865dfa 1624{
626710c9 1625 int res;
10865dfa 1626 struct request *rq;
44c7b0ea
FT		 1627 Sg_fd *sfp = srp->parentfp;
1628 sg_io_hdr_t *hp = &srp->header;
1629 int dxfer_len = (int) hp->dxfer_len;
1630 int dxfer_dir = hp->dxfer_direction;
626710c9 1631 unsigned int iov_count = hp->iovec_count;
44c7b0ea
FT		 1632 Sg_scatter_hold *req_schp = &srp->data;
1633 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1634 struct request_queue *q = sfp->parentdp->device->request_queue;
626710c9 1635 struct rq_map_data *md, map_data;
10865dfa
FT		 1636 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1637
44c7b0ea
FT		 1638 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1639 dxfer_len));
1640
10865dfa
FT		 1641 rq = blk_get_request(q, rw, GFP_ATOMIC);
1642 if (!rq)
1643 return -ENOMEM;
1644
1645 memcpy(rq->cmd, cmd, hp->cmd_len);
1646
1647 rq->cmd_len = hp->cmd_len;
1648 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1649
1650 srp->rq = rq;
1651 rq->end_io_data = srp;
1652 rq->sense = srp->sense_b;
1653 rq->retries = SG_DEFAULT_RETRIES;
1654
1da177e4 1655 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1656 return 0;
10865dfa 1657
626710c9
FT		 1658 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1659 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1660 !sfp->parentdp->device->host->unchecked_isa_dma &&
01cfcddd 1661 blk_rq_aligned(q, hp->dxferp, dxfer_len))
626710c9
FT		 1662 md = NULL;
1663 else
1664 md = &map_data;
1665
1666 if (md) {
1667 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1668 sg_link_reserve(sfp, srp, dxfer_len);
1669 else {
1670 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1671 if (res)
1672 return res;
1673 }
7e56cb0f 1674
626710c9
FT		 1675 md->pages = req_schp->pages;
1676 md->page_order = req_schp->page_order;
1677 md->nr_entries = req_schp->k_use_sg;
56c451f4 1678 md->offset = 0;
97ae77a1 1679 md->null_mapped = hp->dxferp ? 0 : 1;
ecb554a8
FT		 1680 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1681 md->from_user = 1;
1682 else
1683 md->from_user = 0;
626710c9
FT		 1684 }
1685
0fdf96b6
FT		 1686 if (iov_count) {
1687 int len, size = sizeof(struct sg_iovec) * iov_count;
1688 struct iovec *iov;
1689
3094141c
JL		 1690 iov = memdup_user(hp->dxferp, size);
1691 if (IS_ERR(iov))
1692 return PTR_ERR(iov);
0fdf96b6
FT		 1693
1694 len = iov_length(iov, iov_count);
1695 if (hp->dxfer_len < len) {
1696 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1697 len = hp->dxfer_len;
1698 }
1699
1700 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1701 iov_count,
1702 len, GFP_ATOMIC);
1703 kfree(iov);
1704 } else
626710c9
FT		 1705 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1706 hp->dxfer_len, GFP_ATOMIC);
10db10d1
FT		 1707
1708 if (!res) {
626710c9 1709 srp->bio = rq->bio;
10db10d1 1710
626710c9
FT		 1711 if (!md) {
1712 req_schp->dio_in_use = 1;
1713 hp->info |= SG_INFO_DIRECT_IO;
1714 }
1715 }
10db10d1 1716 return res;
1da177e4
LT		 1717}
1718
e7ee4cc0 1719static int sg_finish_rem_req(Sg_request * srp)
1da177e4 1720{
e7ee4cc0
FT		 1721 int ret = 0;
1722
1da177e4
LT		 1723 Sg_fd *sfp = srp->parentfp;
1724 Sg_scatter_hold *req_schp = &srp->data;
1725
1726 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
6e5a30cb
FT		 1727 if (srp->rq) {
1728 if (srp->bio)
e7ee4cc0 1729 ret = blk_rq_unmap_user(srp->bio);
10db10d1 1730
10865dfa 1731 blk_put_request(srp->rq);
6e5a30cb 1732 }
10865dfa 1733
e27168f8
CS		 1734 if (srp->res_used)
1735 sg_unlink_reserve(sfp, srp);
1736 else
1737 sg_remove_scat(req_schp);
1738
1da177e4 1739 sg_remove_request(sfp, srp);
e7ee4cc0
FT		 1740
1741 return ret;
1da177e4
LT		 1742}
1743
1744static int
1745sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1746{
10db10d1 1747 int sg_bufflen = tablesize * sizeof(struct page *);
2d20eaf9 1748 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1749
10db10d1
FT		 1750 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1751 if (!schp->pages)
1da177e4 1752 return -ENOMEM;
1da177e4 1753 schp->sglist_len = sg_bufflen;
d6b10348 1754 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1755}
1756
1da177e4
LT		 1757static int
1758sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1759{
10db10d1 1760 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1761 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1762 int blk_size = buff_size, order;
1763 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4 1764
fb119935 1765 if (blk_size < 0)
1da177e4
LT		 1766 return -EFAULT;
1767 if (0 == blk_size)
1768 ++blk_size; /* don't know why */
b2ed6c69
FT		 1769 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1770 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1da177e4
LT		 1771 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1772 buff_size, blk_size));
d6b10348
MC		 1773
1774 /* N.B. ret_sz carried into this block ... */
1775 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1776 if (mx_sc_elems < 0)
1777 return mx_sc_elems; /* most likely -ENOMEM */
1778
6460e75a
DG		 1779 num = scatter_elem_sz;
1780 if (unlikely(num != scatter_elem_sz_prev)) {
1781 if (num < PAGE_SIZE) {
1782 scatter_elem_sz = PAGE_SIZE;
1783 scatter_elem_sz_prev = PAGE_SIZE;
1784 } else
1785 scatter_elem_sz_prev = num;
1786 }
10db10d1
FT		 1787
1788 if (sfp->low_dma)
1789 gfp_mask |= GFP_DMA;
1790
1791 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1792 gfp_mask |= __GFP_ZERO;
1793
1794 order = get_order(num);
1795retry:
1796 ret_sz = 1 << (PAGE_SHIFT + order);
1797
1798 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1799 k++, rem_sz -= ret_sz) {
1800
6460e75a 1801 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1802 scatter_elem_sz_prev : rem_sz;
1803
1804 schp->pages[k] = alloc_pages(gfp_mask, order);
1805 if (!schp->pages[k])
1806 goto out;
d6b10348 1807
6460e75a
DG		 1808 if (num == scatter_elem_sz_prev) {
1809 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1810 scatter_elem_sz = ret_sz;
1811 scatter_elem_sz_prev = ret_sz;
1812 }
1813 }
d6b10348 1814
7ca63cb4
DG		 1815 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1816 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1817 } /* end of for loop */
1818
10db10d1 1819 schp->page_order = order;
d6b10348 1820 schp->k_use_sg = k;
7ca63cb4
DG		 1821 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1822 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1823
1824 schp->bufflen = blk_size;
1825 if (rem_sz > 0) /* must have failed */
1826 return -ENOMEM;
1da177e4 1827 return 0;
10db10d1
FT		 1828out:
1829 for (i = 0; i < k; i++)
e71044ee 1830 __free_pages(schp->pages[i], order);
10db10d1
FT		 1831
1832 if (--order >= 0)
1833 goto retry;
1834
1835 return -ENOMEM;
1da177e4
LT		 1836}
1837
1da177e4
LT		 1838static void
1839sg_remove_scat(Sg_scatter_hold * schp)
1840{
1841 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1842 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1843 if (!schp->dio_in_use) {
1da177e4
LT		 1844 int k;
1845
10db10d1 1846 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1da177e4 1847 SCSI_LOG_TIMEOUT(5, printk(
10db10d1
FT		 1848 "sg_remove_scat: k=%d, pg=0x%p\n",
1849 k, schp->pages[k]));
1850 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1851 }
6e5a30cb 1852
10db10d1 1853 kfree(schp->pages);
1da177e4 1854 }
d6b10348 1855 }
1da177e4
LT		 1856 memset(schp, 0, sizeof (*schp));
1857}
1858
1da177e4
LT		 1859static int
1860sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1861{
1862 Sg_scatter_hold *schp = &srp->data;
d6b10348 1863 int k, num;
1da177e4
LT		 1864
1865 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1866 num_read_xfer));
1867 if ((!outp) || (num_read_xfer <= 0))
1868 return 0;
d6b10348 1869
10db10d1
FT		 1870 num = 1 << (PAGE_SHIFT + schp->page_order);
1871 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1872 if (num > num_read_xfer) {
10db10d1 1873 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1874 num_read_xfer))
1875 return -EFAULT;
1876 break;
1877 } else {
10db10d1 1878 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1879 num))
1880 return -EFAULT;
1881 num_read_xfer -= num;
1882 if (num_read_xfer <= 0)
1da177e4 1883 break;
d6b10348 1884 outp += num;
1da177e4 1885 }
1da177e4 1886 }
d6b10348 1887
1da177e4
LT		 1888 return 0;
1889}
1890
1891static void
1892sg_build_reserve(Sg_fd * sfp, int req_size)
1893{
1894 Sg_scatter_hold *schp = &sfp->reserve;
1895
1896 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1897 do {
1898 if (req_size < PAGE_SIZE)
1899 req_size = PAGE_SIZE;
1900 if (0 == sg_build_indirect(schp, sfp, req_size))
1901 return;
1902 else
1903 sg_remove_scat(schp);
1904 req_size >>= 1; /* divide by 2 */
1905 } while (req_size > (PAGE_SIZE / 2));
1906}
1907
1908static void
1909sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1910{
1911 Sg_scatter_hold *req_schp = &srp->data;
1912 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 1913 int k, num, rem;
1da177e4
LT		 1914
1915 srp->res_used = 1;
1916 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 1917 rem = size;
d6b10348 1918
10db10d1
FT		 1919 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1920 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 1921 if (rem <= num) {
d6b10348
MC		 1922 req_schp->k_use_sg = k + 1;
1923 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 1924 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 1925
1926 req_schp->bufflen = size;
10db10d1 1927 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 1928 break;
1929 } else
1930 rem -= num;
1da177e4 1931 }
d6b10348
MC		 1932
1933 if (k >= rsv_schp->k_use_sg)
1934 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 1935}
1936
1937static void
1938sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1939{
1940 Sg_scatter_hold *req_schp = &srp->data;
1da177e4
LT		 1941
1942 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1943 (int) req_schp->k_use_sg));
1da177e4
LT		 1944 req_schp->k_use_sg = 0;
1945 req_schp->bufflen = 0;
10db10d1
FT		 1946 req_schp->pages = NULL;
1947 req_schp->page_order = 0;
1da177e4
LT		 1948 req_schp->sglist_len = 0;
1949 sfp->save_scat_len = 0;
1950 srp->res_used = 0;
1951}
1952
1953static Sg_request *
1954sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1955{
1956 Sg_request *resp;
1957 unsigned long iflags;
1958
1959 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1960 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1961 /* look for requests that are ready + not SG_IO owned */
1962 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1963 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1964 resp->done = 2; /* guard against other readers */
1965 break;
1966 }
1967 }
1968 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1969 return resp;
1970}
1971
1da177e4
LT		 1972/* always adds to end of list */
1973static Sg_request *
1974sg_add_request(Sg_fd * sfp)
1975{
1976 int k;
1977 unsigned long iflags;
1978 Sg_request *resp;
1979 Sg_request *rp = sfp->req_arr;
1980
1981 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1982 resp = sfp->headrp;
1983 if (!resp) {
1984 memset(rp, 0, sizeof (Sg_request));
1985 rp->parentfp = sfp;
1986 resp = rp;
1987 sfp->headrp = resp;
1988 } else {
1989 if (0 == sfp->cmd_q)
1990 resp = NULL; /* command queuing disallowed */
1991 else {
1992 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
1993 if (!rp->parentfp)
1994 break;
1995 }
1996 if (k < SG_MAX_QUEUE) {
1997 memset(rp, 0, sizeof (Sg_request));
1998 rp->parentfp = sfp;
1999 while (resp->nextrp)
2000 resp = resp->nextrp;
2001 resp->nextrp = rp;
2002 resp = rp;
2003 } else
2004 resp = NULL;
2005 }
2006 }
2007 if (resp) {
2008 resp->nextrp = NULL;
cb59e840 2009 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2010 }
2011 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2012 return resp;
2013}
2014
2015/* Return of 1 for found; 0 for not found */
2016static int
2017sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2018{
2019 Sg_request *prev_rp;
2020 Sg_request *rp;
2021 unsigned long iflags;
2022 int res = 0;
2023
2024 if ((!sfp) || (!srp) || (!sfp->headrp))
2025 return res;
2026 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2027 prev_rp = sfp->headrp;
2028 if (srp == prev_rp) {
2029 sfp->headrp = prev_rp->nextrp;
2030 prev_rp->parentfp = NULL;
2031 res = 1;
2032 } else {
2033 while ((rp = prev_rp->nextrp)) {
2034 if (srp == rp) {
2035 prev_rp->nextrp = rp->nextrp;
2036 rp->parentfp = NULL;
2037 res = 1;
2038 break;
2039 }
2040 prev_rp = rp;
2041 }
2042 }
2043 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2044 return res;
2045}
2046
1da177e4
LT		 2047static Sg_fd *
2048sg_add_sfp(Sg_device * sdp, int dev)
2049{
2050 Sg_fd *sfp;
2051 unsigned long iflags;
44ec9542 2052 int bufflen;
1da177e4 2053
d6b10348 2054 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4
LT		 2055 if (!sfp)
2056 return NULL;
d6b10348 2057
1da177e4
LT		 2058 init_waitqueue_head(&sfp->read_wait);
2059 rwlock_init(&sfp->rq_list_lock);
2060
c6517b79 2061 kref_init(&sfp->f_ref);
1da177e4
LT		 2062 sfp->timeout = SG_DEFAULT_TIMEOUT;
2063 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2064 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2065 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2066 sdp->device->host->unchecked_isa_dma : 1;
2067 sfp->cmd_q = SG_DEF_COMMAND_Q;
2068 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2069 sfp->parentdp = sdp;
7c07d613 2070 write_lock_irqsave(&sg_index_lock, iflags);
3442f802 2071 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
7c07d613 2072 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2073 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2074 if (unlikely(sg_big_buff != def_reserved_size))
2075 sg_big_buff = def_reserved_size;
2076
44ec9542 2077 bufflen = min_t(int, sg_big_buff,
ae03bf63 2078 queue_max_sectors(sdp->device->request_queue) * 512);
44ec9542 2079 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2080 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2081 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
c6517b79
TB		 2082
2083 kref_get(&sdp->d_ref);
2084 __module_get(THIS_MODULE);
1da177e4
LT		 2085 return sfp;
2086}
2087
c6517b79 2088static void sg_remove_sfp_usercontext(struct work_struct *work)
1da177e4 2089{
c6517b79
TB		 2090 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2091 struct sg_device *sdp = sfp->parentdp;
2092
2093 /* Cleanup any responses which were never read(). */
2094 while (sfp->headrp)
2095 sg_finish_rem_req(sfp->headrp);
1da177e4 2096
1da177e4 2097 if (sfp->reserve.bufflen > 0) {
c6517b79
TB		 2098 SCSI_LOG_TIMEOUT(6,
2099 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2100 (int) sfp->reserve.bufflen,
2101 (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2102 sg_remove_scat(&sfp->reserve);
2103 }
c6517b79
TB		 2104
2105 SCSI_LOG_TIMEOUT(6,
2106 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2107 sdp->disk->disk_name,
2108 sfp));
d6b10348 2109 kfree(sfp);
c6517b79
TB		 2110
2111 scsi_device_put(sdp->device);
2112 sg_put_dev(sdp);
2113 module_put(THIS_MODULE);
1da177e4
LT		 2114}
2115
c6517b79 2116static void sg_remove_sfp(struct kref *kref)
1da177e4 2117{
c6517b79
TB		 2118 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2119 struct sg_device *sdp = sfp->parentdp;
c6517b79 2120 unsigned long iflags;
1da177e4 2121
c6517b79 2122 write_lock_irqsave(&sg_index_lock, iflags);
3442f802 2123 list_del(&sfp->sfd_siblings);
c6517b79
TB		 2124 write_unlock_irqrestore(&sg_index_lock, iflags);
2125 wake_up_interruptible(&sdp->o_excl_wait);
1da177e4 2126
015640ed
FT		 2127 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2128 schedule_work(&sfp->ew.work);
1da177e4
LT		 2129}
2130
2131static int
2132sg_res_in_use(Sg_fd * sfp)
2133{
2134 const Sg_request *srp;
2135 unsigned long iflags;
2136
2137 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2138 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2139 if (srp->res_used)
2140 break;
2141 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2142 return srp ? 1 : 0;
2143}
2144
1da177e4 2145#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2146static int
2147sg_idr_max_id(int id, void *p, void *data)
2148{
2149 int *k = data;
2150
2151 if (*k < id)
2152 *k = id;
2153
2154 return 0;
2155}
2156
1da177e4
LT		 2157static int
2158sg_last_dev(void)
2159{
53474c04 2160 int k = -1;
1da177e4
LT		 2161 unsigned long iflags;
2162
7c07d613
JB		 2163 read_lock_irqsave(&sg_index_lock, iflags);
2164 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2165 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2166 return k + 1; /* origin 1 */
2167}
2168#endif
2169
c6517b79
TB		 2170/* must be called with sg_index_lock held */
2171static Sg_device *sg_lookup_dev(int dev)
1da177e4 2172{
c6517b79
TB		 2173 return idr_find(&sg_index_idr, dev);
2174}
1da177e4 2175
c6517b79
TB		 2176static Sg_device *sg_get_dev(int dev)
2177{
2178 struct sg_device *sdp;
2179 unsigned long flags;
2180
2181 read_lock_irqsave(&sg_index_lock, flags);
2182 sdp = sg_lookup_dev(dev);
2183 if (!sdp)
2184 sdp = ERR_PTR(-ENXIO);
2185 else if (sdp->detached) {
2186 /* If sdp->detached, then the refcount may already be 0, in
2187 * which case it would be a bug to do kref_get().
2188 */
2189 sdp = ERR_PTR(-ENODEV);
2190 } else
2191 kref_get(&sdp->d_ref);
2192 read_unlock_irqrestore(&sg_index_lock, flags);
7c07d613 2193
1da177e4
LT		 2194 return sdp;
2195}
2196
c6517b79
TB		 2197static void sg_put_dev(struct sg_device *sdp)
2198{
2199 kref_put(&sdp->d_ref, sg_device_destroy);
2200}
2201
1da177e4
LT		 2202#ifdef CONFIG_SCSI_PROC_FS
2203
2204static struct proc_dir_entry *sg_proc_sgp = NULL;
2205
2206static char sg_proc_sg_dirname[] = "scsi/sg";
2207
2208static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2209
2210static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2211static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2212 size_t count, loff_t *off);
828c0950
AD		 2213static const struct file_operations adio_fops = {
2214 .owner = THIS_MODULE,
1da177e4 2215 .open = sg_proc_single_open_adio,
828c0950
AD		 2216 .read = seq_read,
2217 .llseek = seq_lseek,
1da177e4
LT		 2218 .write = sg_proc_write_adio,
2219 .release = single_release,
2220};
2221
2222static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2223static ssize_t sg_proc_write_dressz(struct file *filp,
2224 const char __user *buffer, size_t count, loff_t *off);
828c0950
AD		 2225static const struct file_operations dressz_fops = {
2226 .owner = THIS_MODULE,
1da177e4 2227 .open = sg_proc_single_open_dressz,
828c0950
AD		 2228 .read = seq_read,
2229 .llseek = seq_lseek,
1da177e4
LT		 2230 .write = sg_proc_write_dressz,
2231 .release = single_release,
2232};
2233
2234static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2235static int sg_proc_single_open_version(struct inode *inode, struct file *file);
828c0950
AD		 2236static const struct file_operations version_fops = {
2237 .owner = THIS_MODULE,
1da177e4 2238 .open = sg_proc_single_open_version,
828c0950
AD		 2239 .read = seq_read,
2240 .llseek = seq_lseek,
1da177e4
LT		 2241 .release = single_release,
2242};
2243
2244static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2245static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
828c0950
AD		 2246static const struct file_operations devhdr_fops = {
2247 .owner = THIS_MODULE,
1da177e4 2248 .open = sg_proc_single_open_devhdr,
828c0950
AD		 2249 .read = seq_read,
2250 .llseek = seq_lseek,
1da177e4
LT		 2251 .release = single_release,
2252};
2253
2254static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2255static int sg_proc_open_dev(struct inode *inode, struct file *file);
2256static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2257static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2258static void dev_seq_stop(struct seq_file *s, void *v);
828c0950
AD		 2259static const struct file_operations dev_fops = {
2260 .owner = THIS_MODULE,
1da177e4 2261 .open = sg_proc_open_dev,
828c0950
AD		 2262 .read = seq_read,
2263 .llseek = seq_lseek,
1da177e4
LT		 2264 .release = seq_release,
2265};
88e9d34c 2266static const struct seq_operations dev_seq_ops = {
1da177e4
LT		 2267 .start = dev_seq_start,
2268 .next = dev_seq_next,
2269 .stop = dev_seq_stop,
2270 .show = sg_proc_seq_show_dev,
2271};
2272
2273static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2274static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
828c0950
AD		 2275static const struct file_operations devstrs_fops = {
2276 .owner = THIS_MODULE,
1da177e4 2277 .open = sg_proc_open_devstrs,
828c0950
AD		 2278 .read = seq_read,
2279 .llseek = seq_lseek,
1da177e4
LT		 2280 .release = seq_release,
2281};
88e9d34c 2282static const struct seq_operations devstrs_seq_ops = {
1da177e4
LT		 2283 .start = dev_seq_start,
2284 .next = dev_seq_next,
2285 .stop = dev_seq_stop,
2286 .show = sg_proc_seq_show_devstrs,
2287};
2288
2289static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2290static int sg_proc_open_debug(struct inode *inode, struct file *file);
828c0950
AD		 2291static const struct file_operations debug_fops = {
2292 .owner = THIS_MODULE,
1da177e4 2293 .open = sg_proc_open_debug,
828c0950
AD		 2294 .read = seq_read,
2295 .llseek = seq_lseek,
1da177e4
LT		 2296 .release = seq_release,
2297};
88e9d34c 2298static const struct seq_operations debug_seq_ops = {
1da177e4
LT		 2299 .start = dev_seq_start,
2300 .next = dev_seq_next,
2301 .stop = dev_seq_stop,
2302 .show = sg_proc_seq_show_debug,
2303};
2304
2305
2306struct sg_proc_leaf {
2307 const char * name;
828c0950 2308 const struct file_operations * fops;
1da177e4
LT		 2309};
2310
2311static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2312 {"allow_dio", &adio_fops},
2313 {"debug", &debug_fops},
2314 {"def_reserved_size", &dressz_fops},
2315 {"device_hdr", &devhdr_fops},
2316 {"devices", &dev_fops},
2317 {"device_strs", &devstrs_fops},
2318 {"version", &version_fops}
2319};
2320
2321static int
2322sg_proc_init(void)
2323{
2324 int k, mask;
6391a113 2325 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2326 struct sg_proc_leaf * leaf;
2327
66600221 2328 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2329 if (!sg_proc_sgp)
2330 return 1;
2331 for (k = 0; k < num_leaves; ++k) {
2332 leaf = &sg_proc_leaf_arr[k];
2333 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f 2334 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2335 }
2336 return 0;
2337}
2338
2339static void
2340sg_proc_cleanup(void)
2341{
2342 int k;
6391a113 2343 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2344
2345 if (!sg_proc_sgp)
2346 return;
2347 for (k = 0; k < num_leaves; ++k)
2348 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2349 remove_proc_entry(sg_proc_sg_dirname, NULL);
2350}
2351
2352
2353static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2354{
2355 seq_printf(s, "%d\n", *((int *)s->private));
2356 return 0;
2357}
2358
2359static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2360{
2361 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2362}
2363
2364static ssize_t
2365sg_proc_write_adio(struct file *filp, const char __user *buffer,
2366 size_t count, loff_t *off)
2367{
2368 int num;
2369 char buff[11];
2370
2371 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2372 return -EACCES;
2373 num = (count < 10) ? count : 10;
2374 if (copy_from_user(buff, buffer, num))
2375 return -EFAULT;
2376 buff[num] = '\0';
2377 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2378 return count;
2379}
2380
2381static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2382{
2383 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2384}
2385
2386static ssize_t
2387sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2388 size_t count, loff_t *off)
2389{
2390 int num;
2391 unsigned long k = ULONG_MAX;
2392 char buff[11];
2393
2394 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2395 return -EACCES;
2396 num = (count < 10) ? count : 10;
2397 if (copy_from_user(buff, buffer, num))
2398 return -EFAULT;
2399 buff[num] = '\0';
2400 k = simple_strtoul(buff, NULL, 10);
2401 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2402 sg_big_buff = k;
2403 return count;
2404 }
2405 return -ERANGE;
2406}
2407
2408static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2409{
2410 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2411 sg_version_date);
2412 return 0;
2413}
2414
2415static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2416{
2417 return single_open(file, sg_proc_seq_show_version, NULL);
2418}
2419
2420static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2421{
2422 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2423 "online\n");
2424 return 0;
2425}
2426
2427static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2428{
2429 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2430}
2431
2432struct sg_proc_deviter {
2433 loff_t index;
2434 size_t max;
2435};
2436
2437static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2438{
2439 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2440
729d70f5 2441 s->private = it;
1da177e4
LT		 2442 if (! it)
2443 return NULL;
729d70f5 2444
1da177e4
LT		 2445 it->index = *pos;
2446 it->max = sg_last_dev();
2447 if (it->index >= it->max)
729d70f5 2448 return NULL;
1da177e4 2449 return it;
1da177e4
LT		 2450}
2451
2452static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2453{
729d70f5 2454 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2455
2456 *pos = ++it->index;
2457 return (it->index < it->max) ? it : NULL;
2458}
2459
2460static void dev_seq_stop(struct seq_file *s, void *v)
2461{
729d70f5 2462 kfree(s->private);
1da177e4
LT		 2463}
2464
2465static int sg_proc_open_dev(struct inode *inode, struct file *file)
2466{
2467 return seq_open(file, &dev_seq_ops);
2468}
2469
2470static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2471{
2472 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2473 Sg_device *sdp;
2474 struct scsi_device *scsidp;
c6517b79 2475 unsigned long iflags;
1da177e4 2476
c6517b79
TB		 2477 read_lock_irqsave(&sg_index_lock, iflags);
2478 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2479 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2480 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2481 scsidp->host->host_no, scsidp->channel,
2482 scsidp->id, scsidp->lun, (int) scsidp->type,
2483 1,
2484 (int) scsidp->queue_depth,
2485 (int) scsidp->device_busy,
2486 (int) scsi_device_online(scsidp));
2487 else
2488 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
c6517b79 2489 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2490 return 0;
2491}
2492
2493static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2494{
2495 return seq_open(file, &devstrs_seq_ops);
2496}
2497
2498static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2499{
2500 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2501 Sg_device *sdp;
2502 struct scsi_device *scsidp;
c6517b79 2503 unsigned long iflags;
1da177e4 2504
c6517b79
TB		 2505 read_lock_irqsave(&sg_index_lock, iflags);
2506 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2507 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2508 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2509 scsidp->vendor, scsidp->model, scsidp->rev);
2510 else
2511 seq_printf(s, "<no active device>\n");
c6517b79 2512 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2513 return 0;
2514}
2515
c6517b79 2516/* must be called while holding sg_index_lock */
1da177e4
LT		 2517static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2518{
2519 int k, m, new_interface, blen, usg;
2520 Sg_request *srp;
2521 Sg_fd *fp;
2522 const sg_io_hdr_t *hp;
2523 const char * cp;
cb59e840 2524 unsigned int ms;
1da177e4 2525
3442f802
FT		 2526 k = 0;
2527 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2528 k++;
c6517b79 2529 read_lock(&fp->rq_list_lock); /* irqs already disabled */
1da177e4 2530 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3442f802 2531 "(res)sgat=%d low_dma=%d\n", k,
1da177e4
LT		 2532 jiffies_to_msecs(fp->timeout),
2533 fp->reserve.bufflen,
2534 (int) fp->reserve.k_use_sg,
2535 (int) fp->low_dma);
2536 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2537 (int) fp->cmd_q, (int) fp->force_packid,
2538 (int) fp->keep_orphan, (int) fp->closed);
c6517b79
TB		 2539 for (m = 0, srp = fp->headrp;
2540 srp != NULL;
2541 ++m, srp = srp->nextrp) {
1da177e4
LT		 2542 hp = &srp->header;
2543 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2544 if (srp->res_used) {
2545 if (new_interface &&
2546 (SG_FLAG_MMAP_IO & hp->flags))
2547 cp = " mmap>> ";
2548 else
2549 cp = " rb>> ";
2550 } else {
2551 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2552 cp = " dio>> ";
2553 else
2554 cp = " ";
2555 }
2556 seq_printf(s, cp);
d6b10348
MC		 2557 blen = srp->data.bufflen;
2558 usg = srp->data.k_use_sg;
1da177e4
LT		 2559 seq_printf(s, srp->done ?
2560 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2561 : "act:");
1da177e4
LT		 2562 seq_printf(s, " id=%d blen=%d",
2563 srp->header.pack_id, blen);
2564 if (srp->done)
2565 seq_printf(s, " dur=%d", hp->duration);
cb59e840 2566 else {
2567 ms = jiffies_to_msecs(jiffies);
1da177e4 2568 seq_printf(s, " t_o/elap=%d/%d",
cb59e840 2569 (new_interface ? hp->timeout :
2570 jiffies_to_msecs(fp->timeout)),
2571 (ms > hp->duration ? ms - hp->duration : 0));
2572 }
1da177e4
LT		 2573 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2574 (int) srp->data.cmd_opcode);
2575 }
2576 if (0 == m)
2577 seq_printf(s, " No requests active\n");
c6517b79 2578 read_unlock(&fp->rq_list_lock);
1da177e4
LT		 2579 }
2580}
2581
2582static int sg_proc_open_debug(struct inode *inode, struct file *file)
2583{
2584 return seq_open(file, &debug_seq_ops);
2585}
2586
2587static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2588{
2589 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2590 Sg_device *sdp;
c6517b79 2591 unsigned long iflags;
1da177e4
LT		 2592
2593 if (it && (0 == it->index)) {
7c07d613
JB		 2594 seq_printf(s, "max_active_device=%d(origin 1)\n",
2595 (int)it->max);
1da177e4
LT		 2596 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2597 }
1da177e4 2598
c6517b79
TB		 2599 read_lock_irqsave(&sg_index_lock, iflags);
2600 sdp = it ? sg_lookup_dev(it->index) : NULL;
3442f802 2601 if (sdp && !list_empty(&sdp->sfds)) {
c6517b79 2602 struct scsi_device *scsidp = sdp->device;
1da177e4 2603
c6517b79
TB		 2604 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2605 if (sdp->detached)
2606 seq_printf(s, "detached pending close ");
2607 else
2608 seq_printf
2609 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2610 scsidp->host->host_no,
2611 scsidp->channel, scsidp->id,
2612 scsidp->lun,
2613 scsidp->host->hostt->emulated);
2614 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2615 sdp->sg_tablesize, sdp->exclude);
1da177e4
LT		 2616 sg_proc_debug_helper(s, sdp);
2617 }
c6517b79 2618 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2619 return 0;
2620}
2621
2622#endif /* CONFIG_SCSI_PROC_FS */
2623
2624module_init(init_sg);
2625module_exit(exit_sg);
Linux kernel - Deliverables
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