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dm: Call blk_abort_queue on failed paths
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
41#include <linux/fcntl.h>
42#include <linux/init.h>
43#include <linux/poll.h>
1da177e4 44#include <linux/moduleparam.h>
1da177e4 45#include <linux/cdev.h>
7c07d613 46#include <linux/idr.h>
1da177e4
LT		 47#include <linux/seq_file.h>
48#include <linux/blkdev.h>
49#include <linux/delay.h>
6da127ad 50#include <linux/blktrace_api.h>
eb09d3d4 51#include <linux/smp_lock.h>
1da177e4
LT		 52
53#include "scsi.h"
db9dff36 54#include <scsi/scsi_dbg.h>
1da177e4
LT		 55#include <scsi/scsi_host.h>
56#include <scsi/scsi_driver.h>
57#include <scsi/scsi_ioctl.h>
58#include <scsi/sg.h>
59
60#include "scsi_logging.h"
61
62#ifdef CONFIG_SCSI_PROC_FS
63#include <linux/proc_fs.h>
7ca63cb4 64static char *sg_version_date = "20061027";
1da177e4
LT		 65
66static int sg_proc_init(void);
67static void sg_proc_cleanup(void);
68#endif
69
1da177e4
LT		 70#define SG_ALLOW_DIO_DEF 0
71#define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
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
LT		 101#define SG_SECTOR_SZ 512
102#define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
103
ee959b00
TJ		 104static int sg_add(struct device *, struct class_interface *);
105static void sg_remove(struct device *, struct class_interface *);
1da177e4 106
7c07d613
JB		 107static DEFINE_IDR(sg_index_idr);
108static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
1da177e4
LT		 109 file descriptor list for device */
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
LT		 119 unsigned bufflen; /* Size of (aggregate) data buffer */
120 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
10db10d1
FT		 121 struct page **pages;
122 int page_order;
1da177e4
LT		 123 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
124 unsigned char cmd_opcode; /* first byte of command */
125} Sg_scatter_hold;
126
127struct sg_device; /* forward declarations */
128struct sg_fd;
129
130typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 131 struct sg_request *nextrp; /* NULL -> tail request (slist) */
132 struct sg_fd *parentfp; /* NULL -> not in use */
133 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
134 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 135 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 136 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
137 char orphan; /* 1 -> drop on sight, 0 -> normal */
138 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
139 volatile char done; /* 0->before bh, 1->before read, 2->read */
10865dfa 140 struct request *rq;
6e5a30cb 141 struct bio *bio;
1da177e4
LT		 142} Sg_request;
143
144typedef struct sg_fd { /* holds the state of a file descriptor */
145 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
146 struct sg_device *parentdp; /* owning device */
147 wait_queue_head_t read_wait; /* queue read until command done */
148 rwlock_t rq_list_lock; /* protect access to list in req_arr */
149 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
150 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
151 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
152 unsigned save_scat_len; /* original length of trunc. scat. element */
153 Sg_request *headrp; /* head of request slist, NULL->empty */
154 struct fasync_struct *async_qp; /* used by asynchronous notification */
155 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
156 char low_dma; /* as in parent but possibly overridden to 1 */
157 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
158 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
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 */
163} Sg_fd;
164
165typedef struct sg_device { /* holds the state of each scsi generic device */
166 struct scsi_device *device;
167 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
168 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 169 u32 index; /* device index number */
1da177e4
LT		 170 Sg_fd *headfp; /* first open fd belonging to this device */
171 volatile char detached; /* 0->attached, 1->detached pending removal */
172 volatile char exclude; /* opened for exclusive access */
173 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
174 struct gendisk *disk;
175 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
176} Sg_device;
177
178static int sg_fasync(int fd, struct file *filp, int mode);
d6b10348
MC		 179/* tasklet or soft irq callback */
180static void sg_cmd_done(void *data, char *sense, int result, int resid);
10865dfa 181static int sg_start_req(Sg_request *srp, unsigned char *cmd);
1da177e4
LT		 182static void sg_finish_rem_req(Sg_request * srp);
183static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
184static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
185 int tablesize);
186static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
187 Sg_request * srp);
0b07de85
AG		 188static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
189 const char __user *buf, size_t count, int blocking,
190 int read_only, Sg_request **o_srp);
1da177e4
LT		 191static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
192 unsigned char *cmnd, int timeout, int blocking);
1da177e4
LT		 193static int sg_write_xfer(Sg_request * srp);
194static int sg_read_xfer(Sg_request * srp);
195static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
196static void sg_remove_scat(Sg_scatter_hold * schp);
197static void sg_build_reserve(Sg_fd * sfp, int req_size);
198static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
199static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
1da177e4
LT		 200static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
201static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
202static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
203static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
204static Sg_request *sg_add_request(Sg_fd * sfp);
205static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
206static int sg_res_in_use(Sg_fd * sfp);
1da177e4
LT		 207static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
208static Sg_device *sg_get_dev(int dev);
1da177e4
LT		 209#ifdef CONFIG_SCSI_PROC_FS
210static int sg_last_dev(void);
211#endif
212
1da177e4
LT		 213#define SZ_SG_HEADER sizeof(struct sg_header)
214#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
215#define SZ_SG_IOVEC sizeof(sg_iovec_t)
216#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
217
14e507b8
FT		 218static int sg_allow_access(struct file *filp, unsigned char *cmd)
219{
220 struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
221 struct request_queue *q = sfp->parentdp->device->request_queue;
222
223 if (sfp->parentdp->device->type == TYPE_SCANNER)
224 return 0;
225
226 return blk_verify_command(&q->cmd_filter,
227 cmd, filp->f_mode & FMODE_WRITE);
228}
229
10865dfa
FT		 230static void sg_rq_end_io(struct request *rq, int uptodate)
231{
232 sg_cmd_done(rq->end_io_data, rq->sense, rq->errors, rq->data_len);
233}
234
1da177e4
LT		 235static int
236sg_open(struct inode *inode, struct file *filp)
237{
238 int dev = iminor(inode);
239 int flags = filp->f_flags;
d6b10348 240 struct request_queue *q;
1da177e4
LT		 241 Sg_device *sdp;
242 Sg_fd *sfp;
243 int res;
244 int retval;
245
eb09d3d4 246 lock_kernel();
1da177e4
LT		 247 nonseekable_open(inode, filp);
248 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
249 sdp = sg_get_dev(dev);
eb09d3d4
JC		 250 if ((!sdp) || (!sdp->device)) {
251 unlock_kernel();
1da177e4 252 return -ENXIO;
eb09d3d4
JC		 253 }
254 if (sdp->detached) {
255 unlock_kernel();
1da177e4 256 return -ENODEV;
eb09d3d4 257 }
1da177e4
LT		 258
259 /* This driver's module count bumped by fops_get in <linux/fs.h> */
260 /* Prevent the device driver from vanishing while we sleep */
261 retval = scsi_device_get(sdp->device);
eb09d3d4
JC		 262 if (retval) {
263 unlock_kernel();
1da177e4 264 return retval;
eb09d3d4 265 }
1da177e4
LT		 266
267 if (!((flags & O_NONBLOCK) ||
268 scsi_block_when_processing_errors(sdp->device))) {
269 retval = -ENXIO;
270 /* we are in error recovery for this device */
271 goto error_out;
272 }
273
274 if (flags & O_EXCL) {
275 if (O_RDONLY == (flags & O_ACCMODE)) {
276 retval = -EPERM; /* Can't lock it with read only access */
277 goto error_out;
278 }
279 if (sdp->headfp && (flags & O_NONBLOCK)) {
280 retval = -EBUSY;
281 goto error_out;
282 }
283 res = 0;
284 __wait_event_interruptible(sdp->o_excl_wait,
285 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
286 if (res) {
287 retval = res; /* -ERESTARTSYS because signal hit process */
288 goto error_out;
289 }
290 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
291 if (flags & O_NONBLOCK) {
292 retval = -EBUSY;
293 goto error_out;
294 }
295 res = 0;
296 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
297 res);
298 if (res) {
299 retval = res; /* -ERESTARTSYS because signal hit process */
300 goto error_out;
301 }
302 }
303 if (sdp->detached) {
304 retval = -ENODEV;
305 goto error_out;
306 }
307 if (!sdp->headfp) { /* no existing opens on this device */
308 sdp->sgdebug = 0;
d6b10348
MC		 309 q = sdp->device->request_queue;
310 sdp->sg_tablesize = min(q->max_hw_segments,
311 q->max_phys_segments);
1da177e4
LT		 312 }
313 if ((sfp = sg_add_sfp(sdp, dev)))
314 filp->private_data = sfp;
315 else {
316 if (flags & O_EXCL)
317 sdp->exclude = 0; /* undo if error */
318 retval = -ENOMEM;
319 goto error_out;
320 }
eb09d3d4 321 unlock_kernel();
1da177e4
LT		 322 return 0;
323
324 error_out:
325 scsi_device_put(sdp->device);
eb09d3d4 326 unlock_kernel();
1da177e4
LT		 327 return retval;
328}
329
330/* Following function was formerly called 'sg_close' */
331static int
332sg_release(struct inode *inode, struct file *filp)
333{
334 Sg_device *sdp;
335 Sg_fd *sfp;
336
337 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
338 return -ENXIO;
339 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
340 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
341 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
342 if (!sdp->detached) {
343 scsi_device_put(sdp->device);
344 }
345 sdp->exclude = 0;
346 wake_up_interruptible(&sdp->o_excl_wait);
347 }
348 return 0;
349}
350
351static ssize_t
352sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
353{
1da177e4
LT		 354 Sg_device *sdp;
355 Sg_fd *sfp;
356 Sg_request *srp;
357 int req_pack_id = -1;
1da177e4 358 sg_io_hdr_t *hp;
cb59e840
DG		 359 struct sg_header *old_hdr = NULL;
360 int retval = 0;
1da177e4
LT		 361
362 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
363 return -ENXIO;
364 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
365 sdp->disk->disk_name, (int) count));
d6b10348 366
1da177e4
LT		 367 if (!access_ok(VERIFY_WRITE, buf, count))
368 return -EFAULT;
369 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840
DG		 370 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
371 if (!old_hdr)
372 return -ENOMEM;
373 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
374 retval = -EFAULT;
375 goto free_old_hdr;
376 }
377 if (old_hdr->reply_len < 0) {
1da177e4 378 if (count >= SZ_SG_IO_HDR) {
cb59e840
DG		 379 sg_io_hdr_t *new_hdr;
380 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
381 if (!new_hdr) {
382 retval = -ENOMEM;
383 goto free_old_hdr;
384 }
385 retval =__copy_from_user
386 (new_hdr, buf, SZ_SG_IO_HDR);
387 req_pack_id = new_hdr->pack_id;
388 kfree(new_hdr);
389 if (retval) {
390 retval = -EFAULT;
391 goto free_old_hdr;
392 }
1da177e4
LT		 393 }
394 } else
cb59e840 395 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 396 }
397 srp = sg_get_rq_mark(sfp, req_pack_id);
398 if (!srp) { /* now wait on packet to arrive */
cb59e840
DG		 399 if (sdp->detached) {
400 retval = -ENODEV;
401 goto free_old_hdr;
402 }
403 if (filp->f_flags & O_NONBLOCK) {
404 retval = -EAGAIN;
405 goto free_old_hdr;
406 }
1da177e4 407 while (1) {
cb59e840 408 retval = 0; /* following macro beats race condition */
1da177e4 409 __wait_event_interruptible(sfp->read_wait,
cb59e840
DG		 410 (sdp->detached ||
411 (srp = sg_get_rq_mark(sfp, req_pack_id))),
412 retval);
413 if (sdp->detached) {
414 retval = -ENODEV;
415 goto free_old_hdr;
416 }
417 if (0 == retval)
1da177e4 418 break;
cb59e840
DG		 419
420 /* -ERESTARTSYS as signal hit process */
421 goto free_old_hdr;
1da177e4
LT		 422 }
423 }
cb59e840
DG		 424 if (srp->header.interface_id != '\0') {
425 retval = sg_new_read(sfp, buf, count, srp);
426 goto free_old_hdr;
427 }
1da177e4
LT		 428
429 hp = &srp->header;
cb59e840
DG		 430 if (old_hdr == NULL) {
431 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
432 if (! old_hdr) {
433 retval = -ENOMEM;
434 goto free_old_hdr;
435 }
436 }
437 memset(old_hdr, 0, SZ_SG_HEADER);
438 old_hdr->reply_len = (int) hp->timeout;
439 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
440 old_hdr->pack_id = hp->pack_id;
441 old_hdr->twelve_byte =
1da177e4 442 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840
DG		 443 old_hdr->target_status = hp->masked_status;
444 old_hdr->host_status = hp->host_status;
445 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 446 if ((CHECK_CONDITION & hp->masked_status) ||
447 (DRIVER_SENSE & hp->driver_status))
cb59e840
DG		 448 memcpy(old_hdr->sense_buffer, srp->sense_b,
449 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 450 switch (hp->host_status) {
451 /* This setup of 'result' is for backward compatibility and is best
452 ignored by the user who should use target, host + driver status */
453 case DID_OK:
454 case DID_PASSTHROUGH:
455 case DID_SOFT_ERROR:
cb59e840 456 old_hdr->result = 0;
1da177e4
LT		 457 break;
458 case DID_NO_CONNECT:
459 case DID_BUS_BUSY:
460 case DID_TIME_OUT:
cb59e840 461 old_hdr->result = EBUSY;
1da177e4
LT		 462 break;
463 case DID_BAD_TARGET:
464 case DID_ABORT:
465 case DID_PARITY:
466 case DID_RESET:
467 case DID_BAD_INTR:
cb59e840 468 old_hdr->result = EIO;
1da177e4
LT		 469 break;
470 case DID_ERROR:
cb59e840 471 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 472 hp->masked_status == GOOD) ? 0 : EIO;
473 break;
474 default:
cb59e840 475 old_hdr->result = EIO;
1da177e4
LT		 476 break;
477 }
478
479 /* Now copy the result back to the user buffer. */
480 if (count >= SZ_SG_HEADER) {
cb59e840
DG		 481 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
482 retval = -EFAULT;
483 goto free_old_hdr;
484 }
1da177e4 485 buf += SZ_SG_HEADER;
cb59e840
DG		 486 if (count > old_hdr->reply_len)
487 count = old_hdr->reply_len;
1da177e4 488 if (count > SZ_SG_HEADER) {
cb59e840
DG		 489 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
490 retval = -EFAULT;
491 goto free_old_hdr;
492 }
1da177e4
LT		 493 }
494 } else
cb59e840 495 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 496 sg_finish_rem_req(srp);
cb59e840
DG		 497 retval = count;
498free_old_hdr:
c9475cb0 499 kfree(old_hdr);
cb59e840 500 return retval;
1da177e4
LT		 501}
502
503static ssize_t
504sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
505{
506 sg_io_hdr_t *hp = &srp->header;
507 int err = 0;
508 int len;
509
510 if (count < SZ_SG_IO_HDR) {
511 err = -EINVAL;
512 goto err_out;
513 }
514 hp->sb_len_wr = 0;
515 if ((hp->mx_sb_len > 0) && hp->sbp) {
516 if ((CHECK_CONDITION & hp->masked_status) ||
517 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 518 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 519 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
520 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
521 len = (len > sb_len) ? sb_len : len;
522 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
523 err = -EFAULT;
524 goto err_out;
525 }
526 hp->sb_len_wr = len;
527 }
528 }
529 if (hp->masked_status || hp->host_status || hp->driver_status)
530 hp->info |= SG_INFO_CHECK;
531 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
532 err = -EFAULT;
533 goto err_out;
534 }
535 err = sg_read_xfer(srp);
536 err_out:
537 sg_finish_rem_req(srp);
538 return (0 == err) ? count : err;
539}
540
541static ssize_t
542sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
543{
544 int mxsize, cmd_size, k;
545 int input_size, blocking;
546 unsigned char opcode;
547 Sg_device *sdp;
548 Sg_fd *sfp;
549 Sg_request *srp;
550 struct sg_header old_hdr;
551 sg_io_hdr_t *hp;
d6b10348 552 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 553
554 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
555 return -ENXIO;
556 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
557 sdp->disk->disk_name, (int) count));
558 if (sdp->detached)
559 return -ENODEV;
560 if (!((filp->f_flags & O_NONBLOCK) ||
561 scsi_block_when_processing_errors(sdp->device)))
562 return -ENXIO;
563
564 if (!access_ok(VERIFY_READ, buf, count))
565 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
566 if (count < SZ_SG_HEADER)
567 return -EIO;
568 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
569 return -EFAULT;
570 blocking = !(filp->f_flags & O_NONBLOCK);
571 if (old_hdr.reply_len < 0)
0b07de85 572 return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL);
1da177e4
LT		 573 if (count < (SZ_SG_HEADER + 6))
574 return -EIO; /* The minimum scsi command length is 6 bytes. */
575
576 if (!(srp = sg_add_request(sfp))) {
577 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
578 return -EDOM;
579 }
580 buf += SZ_SG_HEADER;
581 __get_user(opcode, buf);
582 if (sfp->next_cmd_len > 0) {
583 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
584 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
585 sfp->next_cmd_len = 0;
586 sg_remove_request(sfp, srp);
587 return -EIO;
588 }
589 cmd_size = sfp->next_cmd_len;
590 sfp->next_cmd_len = 0; /* reset so only this write() effected */
591 } else {
592 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
593 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
594 cmd_size = 12;
595 }
596 SCSI_LOG_TIMEOUT(4, printk(
597 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
598/* Determine buffer size. */
599 input_size = count - cmd_size;
600 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
601 mxsize -= SZ_SG_HEADER;
602 input_size -= SZ_SG_HEADER;
603 if (input_size < 0) {
604 sg_remove_request(sfp, srp);
605 return -EIO; /* User did not pass enough bytes for this command. */
606 }
607 hp = &srp->header;
608 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
609 hp->cmd_len = (unsigned char) cmd_size;
610 hp->iovec_count = 0;
611 hp->mx_sb_len = 0;
612 if (input_size > 0)
613 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
614 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
615 else
616 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
617 hp->dxfer_len = mxsize;
fad7f01e
FT		 618 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
619 hp->dxferp = (char __user *)buf + cmd_size;
620 else
621 hp->dxferp = NULL;
1da177e4
LT		 622 hp->sbp = NULL;
623 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
624 hp->flags = input_size; /* structure abuse ... */
625 hp->pack_id = old_hdr.pack_id;
626 hp->usr_ptr = NULL;
627 if (__copy_from_user(cmnd, buf, cmd_size))
628 return -EFAULT;
629 /*
630 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
631 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
632 * is a non-zero input_size, so emit a warning.
633 */
eaa3e22e
AK		 634 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
635 static char cmd[TASK_COMM_LEN];
636 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
1da177e4
LT		 637 printk(KERN_WARNING
638 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
639 "guessing data in;\n" KERN_WARNING " "
640 "program %s not setting count and/or reply_len properly\n",
641 old_hdr.reply_len - (int)SZ_SG_HEADER,
642 input_size, (unsigned int) cmnd[0],
643 current->comm);
eaa3e22e
AK		 644 strcpy(cmd, current->comm);
645 }
646 }
1da177e4
LT		 647 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
648 return (k < 0) ? k : count;
649}
650
651static ssize_t
0b07de85
AG		 652sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
653 size_t count, int blocking, int read_only,
654 Sg_request **o_srp)
1da177e4
LT		 655{
656 int k;
657 Sg_request *srp;
658 sg_io_hdr_t *hp;
d6b10348 659 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 660 int timeout;
661 unsigned long ul_timeout;
662
663 if (count < SZ_SG_IO_HDR)
664 return -EINVAL;
665 if (!access_ok(VERIFY_READ, buf, count))
666 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
667
668 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
669 if (!(srp = sg_add_request(sfp))) {
670 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
671 return -EDOM;
672 }
673 hp = &srp->header;
674 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
675 sg_remove_request(sfp, srp);
676 return -EFAULT;
677 }
678 if (hp->interface_id != 'S') {
679 sg_remove_request(sfp, srp);
680 return -ENOSYS;
681 }
682 if (hp->flags & SG_FLAG_MMAP_IO) {
683 if (hp->dxfer_len > sfp->reserve.bufflen) {
684 sg_remove_request(sfp, srp);
685 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
686 }
687 if (hp->flags & SG_FLAG_DIRECT_IO) {
688 sg_remove_request(sfp, srp);
689 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
690 }
691 if (sg_res_in_use(sfp)) {
692 sg_remove_request(sfp, srp);
693 return -EBUSY; /* reserve buffer already being used */
694 }
695 }
696 ul_timeout = msecs_to_jiffies(srp->header.timeout);
697 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
698 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
699 sg_remove_request(sfp, srp);
700 return -EMSGSIZE;
701 }
702 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
703 sg_remove_request(sfp, srp);
704 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
705 }
706 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
707 sg_remove_request(sfp, srp);
708 return -EFAULT;
709 }
14e507b8 710 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 711 sg_remove_request(sfp, srp);
712 return -EPERM;
713 }
714 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
715 if (k < 0)
716 return k;
717 if (o_srp)
718 *o_srp = srp;
719 return count;
720}
721
722static int
723sg_common_write(Sg_fd * sfp, Sg_request * srp,
724 unsigned char *cmnd, int timeout, int blocking)
725{
d6b10348 726 int k, data_dir;
1da177e4
LT		 727 Sg_device *sdp = sfp->parentdp;
728 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 729
730 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
731 hp->status = 0;
732 hp->masked_status = 0;
733 hp->msg_status = 0;
734 hp->info = 0;
735 hp->host_status = 0;
736 hp->driver_status = 0;
737 hp->resid = 0;
738 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
739 (int) cmnd[0], (int) hp->cmd_len));
740
10865dfa
FT		 741 k = sg_start_req(srp, cmnd);
742 if (k) {
7ca63cb4 743 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 744 sg_finish_rem_req(srp);
745 return k; /* probably out of space --> ENOMEM */
746 }
747 if ((k = sg_write_xfer(srp))) {
7ca63cb4 748 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
1da177e4
LT		 749 sg_finish_rem_req(srp);
750 return k;
751 }
752 if (sdp->detached) {
753 sg_finish_rem_req(srp);
754 return -ENODEV;
755 }
1da177e4 756
1da177e4
LT		 757 switch (hp->dxfer_direction) {
758 case SG_DXFER_TO_FROM_DEV:
759 case SG_DXFER_FROM_DEV:
d6b10348 760 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 761 break;
762 case SG_DXFER_TO_DEV:
d6b10348 763 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 764 break;
765 case SG_DXFER_UNKNOWN:
d6b10348 766 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 767 break;
768 default:
d6b10348 769 data_dir = DMA_NONE;
1da177e4
LT		 770 break;
771 }
cb59e840 772 hp->duration = jiffies_to_msecs(jiffies);
10db10d1
FT		 773
774 srp->rq->timeout = timeout;
775 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
776 srp->rq, 1, sg_rq_end_io);
777 return 0;
1da177e4
LT		 778}
779
780static int
781sg_srp_done(Sg_request *srp, Sg_fd *sfp)
782{
783 unsigned long iflags;
784 int done;
785
786 read_lock_irqsave(&sfp->rq_list_lock, iflags);
787 done = srp->done;
788 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
789 return done;
790}
791
792static int
793sg_ioctl(struct inode *inode, struct file *filp,
794 unsigned int cmd_in, unsigned long arg)
795{
796 void __user *p = (void __user *)arg;
797 int __user *ip = p;
798 int result, val, read_only;
799 Sg_device *sdp;
800 Sg_fd *sfp;
801 Sg_request *srp;
802 unsigned long iflags;
803
804 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
805 return -ENXIO;
abf54393 806
1da177e4
LT		 807 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
808 sdp->disk->disk_name, (int) cmd_in));
809 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
810
811 switch (cmd_in) {
812 case SG_IO:
813 {
814 int blocking = 1; /* ignore O_NONBLOCK flag */
815
816 if (sdp->detached)
817 return -ENODEV;
818 if (!scsi_block_when_processing_errors(sdp->device))
819 return -ENXIO;
820 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
821 return -EFAULT;
822 result =
0b07de85 823 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
1da177e4
LT		 824 blocking, read_only, &srp);
825 if (result < 0)
826 return result;
827 srp->sg_io_owned = 1;
828 while (1) {
829 result = 0; /* following macro to beat race condition */
830 __wait_event_interruptible(sfp->read_wait,
831 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
832 result);
833 if (sdp->detached)
834 return -ENODEV;
835 if (sfp->closed)
836 return 0; /* request packet dropped already */
837 if (0 == result)
838 break;
839 srp->orphan = 1;
840 return result; /* -ERESTARTSYS because signal hit process */
841 }
842 write_lock_irqsave(&sfp->rq_list_lock, iflags);
843 srp->done = 2;
844 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
845 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
846 return (result < 0) ? result : 0;
847 }
848 case SG_SET_TIMEOUT:
849 result = get_user(val, ip);
850 if (result)
851 return result;
852 if (val < 0)
853 return -EIO;
854 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
855 val = MULDIV (INT_MAX, USER_HZ, HZ);
856 sfp->timeout_user = val;
857 sfp->timeout = MULDIV (val, HZ, USER_HZ);
858
859 return 0;
860 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
861 /* strange ..., for backward compatibility */
862 return sfp->timeout_user;
863 case SG_SET_FORCE_LOW_DMA:
864 result = get_user(val, ip);
865 if (result)
866 return result;
867 if (val) {
868 sfp->low_dma = 1;
869 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
870 val = (int) sfp->reserve.bufflen;
871 sg_remove_scat(&sfp->reserve);
872 sg_build_reserve(sfp, val);
873 }
874 } else {
875 if (sdp->detached)
876 return -ENODEV;
877 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
878 }
879 return 0;
880 case SG_GET_LOW_DMA:
881 return put_user((int) sfp->low_dma, ip);
882 case SG_GET_SCSI_ID:
883 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
884 return -EFAULT;
885 else {
886 sg_scsi_id_t __user *sg_idp = p;
887
888 if (sdp->detached)
889 return -ENODEV;
890 __put_user((int) sdp->device->host->host_no,
891 &sg_idp->host_no);
892 __put_user((int) sdp->device->channel,
893 &sg_idp->channel);
894 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
895 __put_user((int) sdp->device->lun, &sg_idp->lun);
896 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
897 __put_user((short) sdp->device->host->cmd_per_lun,
898 &sg_idp->h_cmd_per_lun);
899 __put_user((short) sdp->device->queue_depth,
900 &sg_idp->d_queue_depth);
901 __put_user(0, &sg_idp->unused[0]);
902 __put_user(0, &sg_idp->unused[1]);
903 return 0;
904 }
905 case SG_SET_FORCE_PACK_ID:
906 result = get_user(val, ip);
907 if (result)
908 return result;
909 sfp->force_packid = val ? 1 : 0;
910 return 0;
911 case SG_GET_PACK_ID:
912 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
913 return -EFAULT;
914 read_lock_irqsave(&sfp->rq_list_lock, iflags);
915 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
916 if ((1 == srp->done) && (!srp->sg_io_owned)) {
917 read_unlock_irqrestore(&sfp->rq_list_lock,
918 iflags);
919 __put_user(srp->header.pack_id, ip);
920 return 0;
921 }
922 }
923 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
924 __put_user(-1, ip);
925 return 0;
926 case SG_GET_NUM_WAITING:
927 read_lock_irqsave(&sfp->rq_list_lock, iflags);
928 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
929 if ((1 == srp->done) && (!srp->sg_io_owned))
930 ++val;
931 }
932 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
933 return put_user(val, ip);
934 case SG_GET_SG_TABLESIZE:
935 return put_user(sdp->sg_tablesize, ip);
936 case SG_SET_RESERVED_SIZE:
937 result = get_user(val, ip);
938 if (result)
939 return result;
940 if (val < 0)
941 return -EINVAL;
44ec9542
AS		 942 val = min_t(int, val,
943 sdp->device->request_queue->max_sectors * 512);
1da177e4
LT		 944 if (val != sfp->reserve.bufflen) {
945 if (sg_res_in_use(sfp) || sfp->mmap_called)
946 return -EBUSY;
947 sg_remove_scat(&sfp->reserve);
948 sg_build_reserve(sfp, val);
949 }
950 return 0;
951 case SG_GET_RESERVED_SIZE:
44ec9542
AS		 952 val = min_t(int, sfp->reserve.bufflen,
953 sdp->device->request_queue->max_sectors * 512);
1da177e4
LT		 954 return put_user(val, ip);
955 case SG_SET_COMMAND_Q:
956 result = get_user(val, ip);
957 if (result)
958 return result;
959 sfp->cmd_q = val ? 1 : 0;
960 return 0;
961 case SG_GET_COMMAND_Q:
962 return put_user((int) sfp->cmd_q, ip);
963 case SG_SET_KEEP_ORPHAN:
964 result = get_user(val, ip);
965 if (result)
966 return result;
967 sfp->keep_orphan = val;
968 return 0;
969 case SG_GET_KEEP_ORPHAN:
970 return put_user((int) sfp->keep_orphan, ip);
971 case SG_NEXT_CMD_LEN:
972 result = get_user(val, ip);
973 if (result)
974 return result;
975 sfp->next_cmd_len = (val > 0) ? val : 0;
976 return 0;
977 case SG_GET_VERSION_NUM:
978 return put_user(sg_version_num, ip);
979 case SG_GET_ACCESS_COUNT:
980 /* faked - we don't have a real access count anymore */
981 val = (sdp->device ? 1 : 0);
982 return put_user(val, ip);
983 case SG_GET_REQUEST_TABLE:
984 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
985 return -EFAULT;
986 else {
cb59e840
DG		 987 sg_req_info_t *rinfo;
988 unsigned int ms;
989
990 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
991 GFP_KERNEL);
992 if (!rinfo)
993 return -ENOMEM;
1da177e4
LT		 994 read_lock_irqsave(&sfp->rq_list_lock, iflags);
995 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
996 ++val, srp = srp ? srp->nextrp : srp) {
997 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
998 if (srp) {
999 rinfo[val].req_state = srp->done + 1;
1000 rinfo[val].problem =
1001 srp->header.masked_status &
1002 srp->header.host_status &
1003 srp->header.driver_status;
cb59e840
DG		 1004 if (srp->done)
1005 rinfo[val].duration =
1006 srp->header.duration;
1007 else {
1008 ms = jiffies_to_msecs(jiffies);
1009 rinfo[val].duration =
1010 (ms > srp->header.duration) ?
1011 (ms - srp->header.duration) : 0;
1012 }
1da177e4 1013 rinfo[val].orphan = srp->orphan;
cb59e840
DG		 1014 rinfo[val].sg_io_owned =
1015 srp->sg_io_owned;
1016 rinfo[val].pack_id =
1017 srp->header.pack_id;
1018 rinfo[val].usr_ptr =
1019 srp->header.usr_ptr;
1da177e4
LT		 1020 }
1021 }
1022 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840
DG		 1023 result = __copy_to_user(p, rinfo,
1024 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1025 result = result ? -EFAULT : 0;
1026 kfree(rinfo);
1027 return result;
1da177e4
LT		 1028 }
1029 case SG_EMULATED_HOST:
1030 if (sdp->detached)
1031 return -ENODEV;
1032 return put_user(sdp->device->host->hostt->emulated, ip);
1033 case SG_SCSI_RESET:
1034 if (sdp->detached)
1035 return -ENODEV;
1036 if (filp->f_flags & O_NONBLOCK) {
939647ee 1037 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1038 return -EBUSY;
1039 } else if (!scsi_block_when_processing_errors(sdp->device))
1040 return -EBUSY;
1041 result = get_user(val, ip);
1042 if (result)
1043 return result;
1044 if (SG_SCSI_RESET_NOTHING == val)
1045 return 0;
1046 switch (val) {
1047 case SG_SCSI_RESET_DEVICE:
1048 val = SCSI_TRY_RESET_DEVICE;
1049 break;
39120e11
BK		 1050 case SG_SCSI_RESET_TARGET:
1051 val = SCSI_TRY_RESET_TARGET;
1052 break;
1da177e4
LT		 1053 case SG_SCSI_RESET_BUS:
1054 val = SCSI_TRY_RESET_BUS;
1055 break;
1056 case SG_SCSI_RESET_HOST:
1057 val = SCSI_TRY_RESET_HOST;
1058 break;
1059 default:
1060 return -EINVAL;
1061 }
1062 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1063 return -EACCES;
1064 return (scsi_reset_provider(sdp->device, val) ==
1065 SUCCESS) ? 0 : -EIO;
1066 case SCSI_IOCTL_SEND_COMMAND:
1067 if (sdp->detached)
1068 return -ENODEV;
1069 if (read_only) {
1070 unsigned char opcode = WRITE_6;
1071 Scsi_Ioctl_Command __user *siocp = p;
1072
1073 if (copy_from_user(&opcode, siocp->data, 1))
1074 return -EFAULT;
14e507b8 1075 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1076 return -EPERM;
1077 }
21b2f0c8 1078 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
1da177e4
LT		 1079 case SG_SET_DEBUG:
1080 result = get_user(val, ip);
1081 if (result)
1082 return result;
1083 sdp->sgdebug = (char) val;
1084 return 0;
1085 case SCSI_IOCTL_GET_IDLUN:
1086 case SCSI_IOCTL_GET_BUS_NUMBER:
1087 case SCSI_IOCTL_PROBE_HOST:
1088 case SG_GET_TRANSFORM:
1089 if (sdp->detached)
1090 return -ENODEV;
1091 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542
AS		 1092 case BLKSECTGET:
1093 return put_user(sdp->device->request_queue->max_sectors * 512,
1094 ip);
6da127ad
CS		 1095 case BLKTRACESETUP:
1096 return blk_trace_setup(sdp->device->request_queue,
1097 sdp->disk->disk_name,
1098 sdp->device->sdev_gendev.devt,
1099 (char *)arg);
1100 case BLKTRACESTART:
1101 return blk_trace_startstop(sdp->device->request_queue, 1);
1102 case BLKTRACESTOP:
1103 return blk_trace_startstop(sdp->device->request_queue, 0);
1104 case BLKTRACETEARDOWN:
1105 return blk_trace_remove(sdp->device->request_queue);
1da177e4
LT		 1106 default:
1107 if (read_only)
1108 return -EPERM; /* don't know so take safe approach */
1109 return scsi_ioctl(sdp->device, cmd_in, p);
1110 }
1111}
1112
1113#ifdef CONFIG_COMPAT
1114static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1115{
1116 Sg_device *sdp;
1117 Sg_fd *sfp;
1118 struct scsi_device *sdev;
1119
1120 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1121 return -ENXIO;
1122
1123 sdev = sdp->device;
1124 if (sdev->host->hostt->compat_ioctl) {
1125 int ret;
1126
1127 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1128
1129 return ret;
1130 }
1131
1132 return -ENOIOCTLCMD;
1133}
1134#endif
1135
1136static unsigned int
1137sg_poll(struct file *filp, poll_table * wait)
1138{
1139 unsigned int res = 0;
1140 Sg_device *sdp;
1141 Sg_fd *sfp;
1142 Sg_request *srp;
1143 int count = 0;
1144 unsigned long iflags;
1145
1146 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1147 || sfp->closed)
1148 return POLLERR;
1149 poll_wait(filp, &sfp->read_wait, wait);
1150 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1151 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1152 /* if any read waiting, flag it */
1153 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1154 res = POLLIN | POLLRDNORM;
1155 ++count;
1156 }
1157 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1158
1159 if (sdp->detached)
1160 res |= POLLHUP;
1161 else if (!sfp->cmd_q) {
1162 if (0 == count)
1163 res |= POLLOUT | POLLWRNORM;
1164 } else if (count < SG_MAX_QUEUE)
1165 res |= POLLOUT | POLLWRNORM;
1166 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1167 sdp->disk->disk_name, (int) res));
1168 return res;
1169}
1170
1171static int
1172sg_fasync(int fd, struct file *filp, int mode)
1173{
1174 int retval;
1175 Sg_device *sdp;
1176 Sg_fd *sfp;
1177
1178 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1179 return -ENXIO;
1180 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1181 sdp->disk->disk_name, mode));
1182
1183 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1184 return (retval < 0) ? retval : 0;
1185}
1186
a13ff0bb
NP		 1187static int
1188sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1189{
1190 Sg_fd *sfp;
d6b10348 1191 unsigned long offset, len, sa;
1da177e4 1192 Sg_scatter_hold *rsv_schp;
10db10d1 1193 int k, length;
1da177e4
LT		 1194
1195 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1196 return VM_FAULT_SIGBUS;
1da177e4 1197 rsv_schp = &sfp->reserve;
a13ff0bb 1198 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1199 if (offset >= rsv_schp->bufflen)
a13ff0bb
NP		 1200 return VM_FAULT_SIGBUS;
1201 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1da177e4 1202 offset, rsv_schp->k_use_sg));
d6b10348 1203 sa = vma->vm_start;
10db10d1
FT		 1204 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1205 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1206 len = vma->vm_end - sa;
10db10d1 1207 len = (len < length) ? len : length;
d6b10348 1208 if (offset < len) {
10db10d1
FT		 1209 struct page *page = nth_page(rsv_schp->pages[k],
1210 offset >> PAGE_SHIFT);
d6b10348 1211 get_page(page); /* increment page count */
a13ff0bb
NP		 1212 vmf->page = page;
1213 return 0; /* success */
1da177e4 1214 }
d6b10348
MC		 1215 sa += len;
1216 offset -= len;
1da177e4 1217 }
d6b10348 1218
a13ff0bb 1219 return VM_FAULT_SIGBUS;
1da177e4
LT		 1220}
1221
1222static struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1223 .fault = sg_vma_fault,
1da177e4
LT		 1224};
1225
1226static int
1227sg_mmap(struct file *filp, struct vm_area_struct *vma)
1228{
1229 Sg_fd *sfp;
d6b10348 1230 unsigned long req_sz, len, sa;
1da177e4 1231 Sg_scatter_hold *rsv_schp;
10db10d1 1232 int k, length;
1da177e4
LT		 1233
1234 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1235 return -ENXIO;
cb59e840 1236 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1237 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1238 (void *) vma->vm_start, (int) req_sz));
1239 if (vma->vm_pgoff)
1240 return -EINVAL; /* want no offset */
1241 rsv_schp = &sfp->reserve;
1242 if (req_sz > rsv_schp->bufflen)
1243 return -ENOMEM; /* cannot map more than reserved buffer */
1244
d6b10348 1245 sa = vma->vm_start;
10db10d1
FT		 1246 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1247 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1248 len = vma->vm_end - sa;
10db10d1 1249 len = (len < length) ? len : length;
d6b10348 1250 sa += len;
1da177e4 1251 }
d6b10348 1252
f9aed0e2 1253 sfp->mmap_called = 1;
1c8e71d7 1254 vma->vm_flags |= VM_RESERVED;
1da177e4
LT		 1255 vma->vm_private_data = sfp;
1256 vma->vm_ops = &sg_mmap_vm_ops;
1257 return 0;
1258}
1259
1260/* This function is a "bottom half" handler that is called by the
1261 * mid level when a command is completed (or has failed). */
1262static void
d6b10348 1263sg_cmd_done(void *data, char *sense, int result, int resid)
1da177e4 1264{
d6b10348 1265 Sg_request *srp = data;
1da177e4
LT		 1266 Sg_device *sdp = NULL;
1267 Sg_fd *sfp;
1da177e4 1268 unsigned long iflags;
cb59e840 1269 unsigned int ms;
1da177e4 1270
1da177e4
LT		 1271 if (NULL == srp) {
1272 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1da177e4
LT		 1273 return;
1274 }
1275 sfp = srp->parentfp;
1276 if (sfp)
1277 sdp = sfp->parentdp;
1278 if ((NULL == sdp) || sdp->detached) {
1279 printk(KERN_INFO "sg_cmd_done: device detached\n");
1da177e4
LT		 1280 return;
1281 }
1282
1da177e4
LT		 1283
1284 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1285 sdp->disk->disk_name, srp->header.pack_id, result));
1286 srp->header.resid = resid;
cb59e840
DG		 1287 ms = jiffies_to_msecs(jiffies);
1288 srp->header.duration = (ms > srp->header.duration) ?
1289 (ms - srp->header.duration) : 0;
d6b10348 1290 if (0 != result) {
1da177e4
LT		 1291 struct scsi_sense_hdr sshdr;
1292
d6b10348
MC		 1293 srp->header.status = 0xff & result;
1294 srp->header.masked_status = status_byte(result);
1295 srp->header.msg_status = msg_byte(result);
1296 srp->header.host_status = host_byte(result);
1297 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1298 if ((sdp->sgdebug > 0) &&
1299 ((CHECK_CONDITION == srp->header.masked_status) ||
1300 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1301 __scsi_print_sense("sg_cmd_done", sense,
1302 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1303
1304 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1305 if (driver_byte(result) != 0
1306 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1307 && !scsi_sense_is_deferred(&sshdr)
1308 && sshdr.sense_key == UNIT_ATTENTION
1309 && sdp->device->removable) {
1310 /* Detected possible disc change. Set the bit - this */
1311 /* may be used if there are filesystems using this device */
1312 sdp->device->changed = 1;
1313 }
1314 }
1315 /* Rely on write phase to clean out srp status values, so no "else" */
1316
1da177e4
LT		 1317 if (sfp->closed) { /* whoops this fd already released, cleanup */
1318 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1319 sg_finish_rem_req(srp);
1320 srp = NULL;
1321 if (NULL == sfp->headrp) {
7ca63cb4 1322 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
1da177e4
LT		 1323 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1324 scsi_device_put(sdp->device);
1325 }
1326 sfp = NULL;
1327 }
1328 } else if (srp && srp->orphan) {
1329 if (sfp->keep_orphan)
1330 srp->sg_io_owned = 0;
1331 else {
1332 sg_finish_rem_req(srp);
1333 srp = NULL;
1334 }
1335 }
1336 if (sfp && srp) {
1337 /* Now wake up any sg_read() that is waiting for this packet. */
1338 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1339 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1340 srp->done = 1;
1341 wake_up_interruptible(&sfp->read_wait);
1342 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1343 }
1344}
1345
1346static struct file_operations sg_fops = {
1347 .owner = THIS_MODULE,
1348 .read = sg_read,
1349 .write = sg_write,
1350 .poll = sg_poll,
1351 .ioctl = sg_ioctl,
1352#ifdef CONFIG_COMPAT
1353 .compat_ioctl = sg_compat_ioctl,
1354#endif
1355 .open = sg_open,
1356 .mmap = sg_mmap,
1357 .release = sg_release,
1358 .fasync = sg_fasync,
1359};
1360
d253878b 1361static struct class *sg_sysfs_class;
1da177e4
LT		 1362
1363static int sg_sysfs_valid = 0;
1364
7c07d613 1365static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1366{
d6b10348 1367 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1368 Sg_device *sdp;
1369 unsigned long iflags;
7c07d613
JB		 1370 int error;
1371 u32 k;
1da177e4 1372
24669f75 1373 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1374 if (!sdp) {
1375 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1376 return ERR_PTR(-ENOMEM);
1377 }
1378 error = -ENOMEM;
1379 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1380 printk(KERN_WARNING "idr expansion Sg_device failure\n");
1381 goto out;
1da177e4
LT		 1382 }
1383
7c07d613
JB		 1384 write_lock_irqsave(&sg_index_lock, iflags);
1385 error = idr_get_new(&sg_index_idr, sdp, &k);
1386 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 1387
7c07d613
JB		 1388 if (error) {
1389 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1390 error);
1391 goto out;
1da177e4
LT		 1392 }
1393
1da177e4
LT		 1394 if (unlikely(k >= SG_MAX_DEVS))
1395 goto overflow;
1396
1da177e4
LT		 1397 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1398 sprintf(disk->disk_name, "sg%d", k);
1399 disk->first_minor = k;
1400 sdp->disk = disk;
1401 sdp->device = scsidp;
1402 init_waitqueue_head(&sdp->o_excl_wait);
d6b10348 1403 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
7c07d613 1404 sdp->index = k;
1da177e4 1405
7c07d613 1406 error = 0;
1da177e4 1407 out:
7c07d613 1408 if (error) {
1da177e4 1409 kfree(sdp);
7c07d613
JB		 1410 return ERR_PTR(error);
1411 }
1412 return sdp;
1da177e4
LT		 1413
1414 overflow:
9ccfc756
JB		 1415 sdev_printk(KERN_WARNING, scsidp,
1416 "Unable to attach sg device type=%d, minor "
1417 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1da177e4
LT		 1418 error = -ENODEV;
1419 goto out;
1420}
1421
1422static int
ee959b00 1423sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1424{
ee959b00 1425 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1426 struct gendisk *disk;
1427 Sg_device *sdp = NULL;
1428 struct cdev * cdev = NULL;
7c07d613 1429 int error;
454e8957 1430 unsigned long iflags;
1da177e4
LT		 1431
1432 disk = alloc_disk(1);
1433 if (!disk) {
1434 printk(KERN_WARNING "alloc_disk failed\n");
1435 return -ENOMEM;
1436 }
1437 disk->major = SCSI_GENERIC_MAJOR;
1438
1439 error = -ENOMEM;
1440 cdev = cdev_alloc();
1441 if (!cdev) {
1442 printk(KERN_WARNING "cdev_alloc failed\n");
1443 goto out;
1444 }
1445 cdev->owner = THIS_MODULE;
1446 cdev->ops = &sg_fops;
1447
7c07d613
JB		 1448 sdp = sg_alloc(disk, scsidp);
1449 if (IS_ERR(sdp)) {
1da177e4 1450 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1451 error = PTR_ERR(sdp);
1da177e4
LT		 1452 goto out;
1453 }
1da177e4 1454
7c07d613 1455 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1456 if (error)
454e8957 1457 goto cdev_add_err;
5e3c34c1 1458
1da177e4
LT		 1459 sdp->cdev = cdev;
1460 if (sg_sysfs_valid) {
ee959b00 1461 struct device *sg_class_member;
1da177e4 1462
24b42566
GKH		 1463 sg_class_member = device_create_drvdata(sg_sysfs_class,
1464 cl_dev->parent,
1465 MKDEV(SCSI_GENERIC_MAJOR,
1466 sdp->index),
1467 sdp,
1468 "%s", disk->disk_name);
d07e0361
FT		 1469 if (IS_ERR(sg_class_member)) {
1470 printk(KERN_ERR "sg_add: "
ee959b00 1471 "device_create failed\n");
d07e0361
FT		 1472 error = PTR_ERR(sg_class_member);
1473 goto cdev_add_err;
1474 }
d07e0361 1475 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1476 &sg_class_member->kobj, "generic");
1477 if (error)
1478 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1479 "'generic' back to sg%d\n", sdp->index);
1da177e4 1480 } else
7c07d613 1481 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1482
9ccfc756 1483 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1484 "Attached scsi generic sg%d type %d\n", sdp->index,
1485 scsidp->type);
1da177e4 1486
ee959b00 1487 dev_set_drvdata(cl_dev, sdp);
a24484f2 1488
1da177e4
LT		 1489 return 0;
1490
454e8957 1491cdev_add_err:
7c07d613
JB		 1492 write_lock_irqsave(&sg_index_lock, iflags);
1493 idr_remove(&sg_index_idr, sdp->index);
1494 write_unlock_irqrestore(&sg_index_lock, iflags);
1495 kfree(sdp);
454e8957 1496
1da177e4
LT		 1497out:
1498 put_disk(disk);
1499 if (cdev)
1500 cdev_del(cdev);
1501 return error;
1502}
1503
1504static void
ee959b00 1505sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1506{
ee959b00
TJ		 1507 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1508 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1509 unsigned long iflags;
1510 Sg_fd *sfp;
1511 Sg_fd *tsfp;
1512 Sg_request *srp;
1513 Sg_request *tsrp;
7c07d613 1514 int delay;
1da177e4 1515
7c07d613 1516 if (!sdp)
1da177e4 1517 return;
7c07d613 1518
1da177e4 1519 delay = 0;
7c07d613
JB		 1520 write_lock_irqsave(&sg_index_lock, iflags);
1521 if (sdp->headfp) {
1522 sdp->detached = 1;
1523 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1524 tsfp = sfp->nextfp;
1525 for (srp = sfp->headrp; srp; srp = tsrp) {
1526 tsrp = srp->nextrp;
1527 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1528 sg_finish_rem_req(srp);
1da177e4 1529 }
7c07d613
JB		 1530 if (sfp->closed) {
1531 scsi_device_put(sdp->device);
1532 __sg_remove_sfp(sdp, sfp);
1533 } else {
1534 delay = 1;
1535 wake_up_interruptible(&sfp->read_wait);
1536 kill_fasync(&sfp->async_qp, SIGPOLL,
1537 POLL_HUP);
1da177e4 1538 }
1da177e4 1539 }
7c07d613
JB		 1540 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index));
1541 if (NULL == sdp->headfp) {
1542 idr_remove(&sg_index_idr, sdp->index);
1543 }
1544 } else { /* nothing active, simple case */
1545 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index));
1546 idr_remove(&sg_index_idr, sdp->index);
1547 }
1548 write_unlock_irqrestore(&sg_index_lock, iflags);
1549
1550 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1551 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1552 cdev_del(sdp->cdev);
1553 sdp->cdev = NULL;
1554 put_disk(sdp->disk);
1555 sdp->disk = NULL;
1556 if (NULL == sdp->headfp)
1557 kfree(sdp);
1da177e4
LT		 1558
1559 if (delay)
1560 msleep(10); /* dirty detach so delay device destruction */
1561}
1562
6460e75a
DG		 1563module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1564module_param_named(def_reserved_size, def_reserved_size, int,
1565 S_IRUGO | S_IWUSR);
1da177e4
LT		 1566module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1567
1568MODULE_AUTHOR("Douglas Gilbert");
1569MODULE_DESCRIPTION("SCSI generic (sg) driver");
1570MODULE_LICENSE("GPL");
1571MODULE_VERSION(SG_VERSION_STR);
f018fa55 1572MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1573
6460e75a
DG		 1574MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1575 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1576MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1577MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1578
1579static int __init
1580init_sg(void)
1581{
1582 int rc;
1583
6460e75a
DG		 1584 if (scatter_elem_sz < PAGE_SIZE) {
1585 scatter_elem_sz = PAGE_SIZE;
1586 scatter_elem_sz_prev = scatter_elem_sz;
1587 }
1da177e4
LT		 1588 if (def_reserved_size >= 0)
1589 sg_big_buff = def_reserved_size;
6460e75a
DG		 1590 else
1591 def_reserved_size = sg_big_buff;
1da177e4
LT		 1592
1593 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1594 SG_MAX_DEVS, "sg");
1595 if (rc)
1596 return rc;
d253878b 1597 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1598 if ( IS_ERR(sg_sysfs_class) ) {
1599 rc = PTR_ERR(sg_sysfs_class);
1600 goto err_out;
1601 }
1602 sg_sysfs_valid = 1;
1603 rc = scsi_register_interface(&sg_interface);
1604 if (0 == rc) {
1605#ifdef CONFIG_SCSI_PROC_FS
1606 sg_proc_init();
1607#endif /* CONFIG_SCSI_PROC_FS */
1608 return 0;
1609 }
d253878b 1610 class_destroy(sg_sysfs_class);
1da177e4
LT		 1611err_out:
1612 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1613 return rc;
1614}
1615
1616static void __exit
1617exit_sg(void)
1618{
1619#ifdef CONFIG_SCSI_PROC_FS
1620 sg_proc_cleanup();
1621#endif /* CONFIG_SCSI_PROC_FS */
1622 scsi_unregister_interface(&sg_interface);
d253878b 1623 class_destroy(sg_sysfs_class);
1da177e4
LT		 1624 sg_sysfs_valid = 0;
1625 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1626 SG_MAX_DEVS);
7c07d613 1627 idr_destroy(&sg_index_idr);
1da177e4
LT		 1628}
1629
10865dfa
FT		 1630static int __sg_start_req(struct sg_request *srp, struct sg_io_hdr *hp,
1631 unsigned char *cmd)
1632{
1633 struct sg_fd *sfp = srp->parentfp;
1634 struct request_queue *q = sfp->parentdp->device->request_queue;
1635 struct request *rq;
1636 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1637
1638 rq = blk_get_request(q, rw, GFP_ATOMIC);
1639 if (!rq)
1640 return -ENOMEM;
1641
1642 memcpy(rq->cmd, cmd, hp->cmd_len);
1643
1644 rq->cmd_len = hp->cmd_len;
1645 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1646
1647 srp->rq = rq;
1648 rq->end_io_data = srp;
1649 rq->sense = srp->sense_b;
1650 rq->retries = SG_DEFAULT_RETRIES;
1651
1652 return 0;
1653}
1654
1655static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1da177e4
LT		 1656{
1657 int res;
1658 Sg_fd *sfp = srp->parentfp;
1659 sg_io_hdr_t *hp = &srp->header;
1660 int dxfer_len = (int) hp->dxfer_len;
1661 int dxfer_dir = hp->dxfer_direction;
1662 Sg_scatter_hold *req_schp = &srp->data;
1663 Sg_scatter_hold *rsv_schp = &sfp->reserve;
6e5a30cb 1664 struct request_queue *q = sfp->parentdp->device->request_queue;
10db10d1 1665 struct rq_map_data map_data;
1da177e4
LT		 1666
1667 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
10865dfa 1668
10db10d1
FT		 1669 res = __sg_start_req(srp, hp, cmd);
1670 if (res)
1671 return res;
1672
1da177e4 1673 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1674 return 0;
10865dfa 1675
6e5a30cb 1676#ifdef SG_ALLOW_DIO_CODE
1da177e4
LT		 1677 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1678 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
6e5a30cb 1679 (!sfp->parentdp->device->host->unchecked_isa_dma) &&
01cfcddd 1680 blk_rq_aligned(q, hp->dxferp, dxfer_len))
10db10d1 1681 return sg_build_direct(srp, sfp, dxfer_len);
6e5a30cb 1682#endif
1da177e4
LT		 1683 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1684 sg_link_reserve(sfp, srp, dxfer_len);
10db10d1 1685 else
1da177e4 1686 res = sg_build_indirect(req_schp, sfp, dxfer_len);
10db10d1
FT		 1687
1688 if (!res) {
1689 struct request *rq = srp->rq;
1690 Sg_scatter_hold *schp = &srp->data;
1691 int iovec_count = (int) hp->iovec_count;
1692
1693 map_data.pages = schp->pages;
1694 map_data.page_order = schp->page_order;
1695 map_data.nr_entries = schp->k_use_sg;
1696
1697 if (iovec_count)
1698 res = blk_rq_map_user_iov(q, rq, &map_data, hp->dxferp,
1699 iovec_count,
1700 hp->dxfer_len, GFP_ATOMIC);
1701 else
1702 res = blk_rq_map_user(q, rq, &map_data, hp->dxferp,
1703 hp->dxfer_len, GFP_ATOMIC);
1704
1705 if (!res)
1706 srp->bio = rq->bio;
1da177e4 1707 }
10db10d1
FT		 1708
1709 return res;
1da177e4
LT		 1710}
1711
1712static void
1713sg_finish_rem_req(Sg_request * srp)
1714{
1715 Sg_fd *sfp = srp->parentfp;
1716 Sg_scatter_hold *req_schp = &srp->data;
1717
1718 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1719 if (srp->res_used)
1720 sg_unlink_reserve(sfp, srp);
1721 else
1722 sg_remove_scat(req_schp);
10865dfa 1723
6e5a30cb
FT		 1724 if (srp->rq) {
1725 if (srp->bio)
1726 blk_rq_unmap_user(srp->bio);
10db10d1 1727
10865dfa 1728 blk_put_request(srp->rq);
6e5a30cb 1729 }
10865dfa 1730
1da177e4
LT		 1731 sg_remove_request(sfp, srp);
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		 1747/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1748static int
1749sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1750{
1da177e4
LT		 1751 sg_io_hdr_t *hp = &srp->header;
1752 Sg_scatter_hold *schp = &srp->data;
6e5a30cb
FT		 1753 int res;
1754 struct request *rq = srp->rq;
1755 struct request_queue *q = sfp->parentdp->device->request_queue;
d6b10348 1756
6e5a30cb
FT		 1757 res = blk_rq_map_user(q, rq, NULL, hp->dxferp, dxfer_len, GFP_ATOMIC);
1758 if (res)
1759 return res;
1760 srp->bio = rq->bio;
1da177e4
LT		 1761 schp->dio_in_use = 1;
1762 hp->info |= SG_INFO_DIRECT_IO;
1763 return 0;
1da177e4
LT		 1764}
1765
1766static int
1767sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1768{
10db10d1 1769 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1770 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1771 int blk_size = buff_size, order;
1772 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4 1773
fb119935 1774 if (blk_size < 0)
1da177e4
LT		 1775 return -EFAULT;
1776 if (0 == blk_size)
1777 ++blk_size; /* don't know why */
1778/* round request up to next highest SG_SECTOR_SZ byte boundary */
1779 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1780 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1781 buff_size, blk_size));
d6b10348
MC		 1782
1783 /* N.B. ret_sz carried into this block ... */
1784 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1785 if (mx_sc_elems < 0)
1786 return mx_sc_elems; /* most likely -ENOMEM */
1787
6460e75a
DG		 1788 num = scatter_elem_sz;
1789 if (unlikely(num != scatter_elem_sz_prev)) {
1790 if (num < PAGE_SIZE) {
1791 scatter_elem_sz = PAGE_SIZE;
1792 scatter_elem_sz_prev = PAGE_SIZE;
1793 } else
1794 scatter_elem_sz_prev = num;
1795 }
10db10d1
FT		 1796
1797 if (sfp->low_dma)
1798 gfp_mask |= GFP_DMA;
1799
1800 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1801 gfp_mask |= __GFP_ZERO;
1802
1803 order = get_order(num);
1804retry:
1805 ret_sz = 1 << (PAGE_SHIFT + order);
1806
1807 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1808 k++, rem_sz -= ret_sz) {
1809
6460e75a 1810 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1811 scatter_elem_sz_prev : rem_sz;
1812
1813 schp->pages[k] = alloc_pages(gfp_mask, order);
1814 if (!schp->pages[k])
1815 goto out;
d6b10348 1816
6460e75a
DG		 1817 if (num == scatter_elem_sz_prev) {
1818 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1819 scatter_elem_sz = ret_sz;
1820 scatter_elem_sz_prev = ret_sz;
1821 }
1822 }
d6b10348 1823
7ca63cb4
DG		 1824 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1825 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1826 } /* end of for loop */
1827
10db10d1 1828 schp->page_order = order;
d6b10348 1829 schp->k_use_sg = k;
7ca63cb4
DG		 1830 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1831 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1832
1833 schp->bufflen = blk_size;
1834 if (rem_sz > 0) /* must have failed */
1835 return -ENOMEM;
1da177e4 1836 return 0;
10db10d1
FT		 1837out:
1838 for (i = 0; i < k; i++)
1839 __free_pages(schp->pages[k], order);
1840
1841 if (--order >= 0)
1842 goto retry;
1843
1844 return -ENOMEM;
1da177e4
LT		 1845}
1846
1847static int
1848sg_write_xfer(Sg_request * srp)
1849{
1850 sg_io_hdr_t *hp = &srp->header;
1851 Sg_scatter_hold *schp = &srp->data;
1852 int num_xfer = 0;
1da177e4 1853 int dxfer_dir = hp->dxfer_direction;
1da177e4
LT		 1854 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1855
1856 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1857 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1858 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1859 if (schp->bufflen < num_xfer)
1860 num_xfer = schp->bufflen;
1861 }
1862 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1863 (new_interface
1864 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1865 return 0;
1866
10db10d1
FT		 1867 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, k_use_sg=%d\n",
1868 num_xfer, schp->k_use_sg));
d6b10348 1869
1da177e4
LT		 1870 return 0;
1871}
1872
1da177e4
LT		 1873static void
1874sg_remove_scat(Sg_scatter_hold * schp)
1875{
1876 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1877 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1878 if (!schp->dio_in_use) {
1da177e4
LT		 1879 int k;
1880
10db10d1 1881 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1da177e4 1882 SCSI_LOG_TIMEOUT(5, printk(
10db10d1
FT		 1883 "sg_remove_scat: k=%d, pg=0x%p\n",
1884 k, schp->pages[k]));
1885 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1886 }
6e5a30cb 1887
10db10d1 1888 kfree(schp->pages);
1da177e4 1889 }
d6b10348 1890 }
1da177e4
LT		 1891 memset(schp, 0, sizeof (*schp));
1892}
1893
1894static int
1895sg_read_xfer(Sg_request * srp)
1896{
1897 sg_io_hdr_t *hp = &srp->header;
1898 Sg_scatter_hold *schp = &srp->data;
1899 int num_xfer = 0;
1da177e4 1900 int dxfer_dir = hp->dxfer_direction;
1da177e4
LT		 1901 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1902
1903 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
1904 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1905 num_xfer = hp->dxfer_len;
1906 if (schp->bufflen < num_xfer)
1907 num_xfer = schp->bufflen;
1908 }
1909 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1910 (new_interface
1911 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1912 return 0;
1913
1914 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
10db10d1 1915 num_xfer, (int)hp->iovec_count, schp->k_use_sg));
1da177e4
LT		 1916 return 0;
1917}
1918
1919static int
1920sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1921{
1922 Sg_scatter_hold *schp = &srp->data;
d6b10348 1923 int k, num;
1da177e4
LT		 1924
1925 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1926 num_read_xfer));
1927 if ((!outp) || (num_read_xfer <= 0))
1928 return 0;
d6b10348 1929
10db10d1
FT		 1930 blk_rq_unmap_user(srp->bio);
1931 srp->bio = NULL;
1932
1933 num = 1 << (PAGE_SHIFT + schp->page_order);
1934 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1935 if (num > num_read_xfer) {
10db10d1 1936 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1937 num_read_xfer))
1938 return -EFAULT;
1939 break;
1940 } else {
10db10d1 1941 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1942 num))
1943 return -EFAULT;
1944 num_read_xfer -= num;
1945 if (num_read_xfer <= 0)
1da177e4 1946 break;
d6b10348 1947 outp += num;
1da177e4 1948 }
1da177e4 1949 }
d6b10348 1950
1da177e4
LT		 1951 return 0;
1952}
1953
1954static void
1955sg_build_reserve(Sg_fd * sfp, int req_size)
1956{
1957 Sg_scatter_hold *schp = &sfp->reserve;
1958
1959 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1960 do {
1961 if (req_size < PAGE_SIZE)
1962 req_size = PAGE_SIZE;
1963 if (0 == sg_build_indirect(schp, sfp, req_size))
1964 return;
1965 else
1966 sg_remove_scat(schp);
1967 req_size >>= 1; /* divide by 2 */
1968 } while (req_size > (PAGE_SIZE / 2));
1969}
1970
1971static void
1972sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1973{
1974 Sg_scatter_hold *req_schp = &srp->data;
1975 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 1976 int k, num, rem;
1da177e4
LT		 1977
1978 srp->res_used = 1;
1979 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 1980 rem = size;
d6b10348 1981
10db10d1
FT		 1982 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1983 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 1984 if (rem <= num) {
d6b10348
MC		 1985 req_schp->k_use_sg = k + 1;
1986 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 1987 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 1988
1989 req_schp->bufflen = size;
1990 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
10db10d1 1991 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 1992 break;
1993 } else
1994 rem -= num;
1da177e4 1995 }
d6b10348
MC		 1996
1997 if (k >= rsv_schp->k_use_sg)
1998 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 1999}
2000
2001static void
2002sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2003{
2004 Sg_scatter_hold *req_schp = &srp->data;
1da177e4
LT		 2005
2006 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2007 (int) req_schp->k_use_sg));
1da177e4
LT		 2008 req_schp->k_use_sg = 0;
2009 req_schp->bufflen = 0;
10db10d1
FT		 2010 req_schp->pages = NULL;
2011 req_schp->page_order = 0;
1da177e4
LT		 2012 req_schp->sglist_len = 0;
2013 sfp->save_scat_len = 0;
2014 srp->res_used = 0;
2015}
2016
2017static Sg_request *
2018sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2019{
2020 Sg_request *resp;
2021 unsigned long iflags;
2022
2023 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2024 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2025 /* look for requests that are ready + not SG_IO owned */
2026 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2027 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2028 resp->done = 2; /* guard against other readers */
2029 break;
2030 }
2031 }
2032 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2033 return resp;
2034}
2035
2036#ifdef CONFIG_SCSI_PROC_FS
2037static Sg_request *
2038sg_get_nth_request(Sg_fd * sfp, int nth)
2039{
2040 Sg_request *resp;
2041 unsigned long iflags;
2042 int k;
2043
2044 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2045 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2046 ++k, resp = resp->nextrp) ;
2047 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2048 return resp;
2049}
2050#endif
2051
2052/* always adds to end of list */
2053static Sg_request *
2054sg_add_request(Sg_fd * sfp)
2055{
2056 int k;
2057 unsigned long iflags;
2058 Sg_request *resp;
2059 Sg_request *rp = sfp->req_arr;
2060
2061 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2062 resp = sfp->headrp;
2063 if (!resp) {
2064 memset(rp, 0, sizeof (Sg_request));
2065 rp->parentfp = sfp;
2066 resp = rp;
2067 sfp->headrp = resp;
2068 } else {
2069 if (0 == sfp->cmd_q)
2070 resp = NULL; /* command queuing disallowed */
2071 else {
2072 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2073 if (!rp->parentfp)
2074 break;
2075 }
2076 if (k < SG_MAX_QUEUE) {
2077 memset(rp, 0, sizeof (Sg_request));
2078 rp->parentfp = sfp;
2079 while (resp->nextrp)
2080 resp = resp->nextrp;
2081 resp->nextrp = rp;
2082 resp = rp;
2083 } else
2084 resp = NULL;
2085 }
2086 }
2087 if (resp) {
2088 resp->nextrp = NULL;
cb59e840 2089 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2090 }
2091 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2092 return resp;
2093}
2094
2095/* Return of 1 for found; 0 for not found */
2096static int
2097sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2098{
2099 Sg_request *prev_rp;
2100 Sg_request *rp;
2101 unsigned long iflags;
2102 int res = 0;
2103
2104 if ((!sfp) || (!srp) || (!sfp->headrp))
2105 return res;
2106 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2107 prev_rp = sfp->headrp;
2108 if (srp == prev_rp) {
2109 sfp->headrp = prev_rp->nextrp;
2110 prev_rp->parentfp = NULL;
2111 res = 1;
2112 } else {
2113 while ((rp = prev_rp->nextrp)) {
2114 if (srp == rp) {
2115 prev_rp->nextrp = rp->nextrp;
2116 rp->parentfp = NULL;
2117 res = 1;
2118 break;
2119 }
2120 prev_rp = rp;
2121 }
2122 }
2123 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2124 return res;
2125}
2126
2127#ifdef CONFIG_SCSI_PROC_FS
2128static Sg_fd *
2129sg_get_nth_sfp(Sg_device * sdp, int nth)
2130{
2131 Sg_fd *resp;
2132 unsigned long iflags;
2133 int k;
2134
7c07d613 2135 read_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2136 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2137 ++k, resp = resp->nextfp) ;
7c07d613 2138 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2139 return resp;
2140}
2141#endif
2142
2143static Sg_fd *
2144sg_add_sfp(Sg_device * sdp, int dev)
2145{
2146 Sg_fd *sfp;
2147 unsigned long iflags;
44ec9542 2148 int bufflen;
1da177e4 2149
d6b10348 2150 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4
LT		 2151 if (!sfp)
2152 return NULL;
d6b10348 2153
1da177e4
LT		 2154 init_waitqueue_head(&sfp->read_wait);
2155 rwlock_init(&sfp->rq_list_lock);
2156
2157 sfp->timeout = SG_DEFAULT_TIMEOUT;
2158 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2159 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2160 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2161 sdp->device->host->unchecked_isa_dma : 1;
2162 sfp->cmd_q = SG_DEF_COMMAND_Q;
2163 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2164 sfp->parentdp = sdp;
7c07d613 2165 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2166 if (!sdp->headfp)
2167 sdp->headfp = sfp;
2168 else { /* add to tail of existing list */
2169 Sg_fd *pfp = sdp->headfp;
2170 while (pfp->nextfp)
2171 pfp = pfp->nextfp;
2172 pfp->nextfp = sfp;
2173 }
7c07d613 2174 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2175 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2176 if (unlikely(sg_big_buff != def_reserved_size))
2177 sg_big_buff = def_reserved_size;
2178
44ec9542
AS		 2179 bufflen = min_t(int, sg_big_buff,
2180 sdp->device->request_queue->max_sectors * 512);
2181 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2182 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2183 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2184 return sfp;
2185}
2186
2187static void
2188__sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2189{
2190 Sg_fd *fp;
2191 Sg_fd *prev_fp;
2192
2193 prev_fp = sdp->headfp;
2194 if (sfp == prev_fp)
2195 sdp->headfp = prev_fp->nextfp;
2196 else {
2197 while ((fp = prev_fp->nextfp)) {
2198 if (sfp == fp) {
2199 prev_fp->nextfp = fp->nextfp;
2200 break;
2201 }
2202 prev_fp = fp;
2203 }
2204 }
2205 if (sfp->reserve.bufflen > 0) {
2206 SCSI_LOG_TIMEOUT(6,
2207 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2208 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2209 sg_remove_scat(&sfp->reserve);
2210 }
2211 sfp->parentdp = NULL;
2212 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
d6b10348 2213 kfree(sfp);
1da177e4
LT		 2214}
2215
2216/* Returns 0 in normal case, 1 when detached and sdp object removed */
2217static int
2218sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2219{
2220 Sg_request *srp;
2221 Sg_request *tsrp;
2222 int dirty = 0;
2223 int res = 0;
2224
2225 for (srp = sfp->headrp; srp; srp = tsrp) {
2226 tsrp = srp->nextrp;
2227 if (sg_srp_done(srp, sfp))
2228 sg_finish_rem_req(srp);
2229 else
2230 ++dirty;
2231 }
2232 if (0 == dirty) {
2233 unsigned long iflags;
2234
7c07d613 2235 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2236 __sg_remove_sfp(sdp, sfp);
2237 if (sdp->detached && (NULL == sdp->headfp)) {
7c07d613
JB		 2238 idr_remove(&sg_index_idr, sdp->index);
2239 kfree(sdp);
1da177e4
LT		 2240 res = 1;
2241 }
7c07d613 2242 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2243 } else {
2244 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2245 /* only bump the access_count if we actually succeeded in
2246 * throwing another counter on the host module */
2247 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2248 sfp->closed = 1; /* flag dirty state on this fd */
2249 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2250 dirty));
2251 }
2252 return res;
2253}
2254
2255static int
2256sg_res_in_use(Sg_fd * sfp)
2257{
2258 const Sg_request *srp;
2259 unsigned long iflags;
2260
2261 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2262 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2263 if (srp->res_used)
2264 break;
2265 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2266 return srp ? 1 : 0;
2267}
2268
1da177e4 2269#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2270static int
2271sg_idr_max_id(int id, void *p, void *data)
2272{
2273 int *k = data;
2274
2275 if (*k < id)
2276 *k = id;
2277
2278 return 0;
2279}
2280
1da177e4
LT		 2281static int
2282sg_last_dev(void)
2283{
53474c04 2284 int k = -1;
1da177e4
LT		 2285 unsigned long iflags;
2286
7c07d613
JB		 2287 read_lock_irqsave(&sg_index_lock, iflags);
2288 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2289 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2290 return k + 1; /* origin 1 */
2291}
2292#endif
2293
2294static Sg_device *
2295sg_get_dev(int dev)
2296{
7c07d613 2297 Sg_device *sdp;
1da177e4
LT		 2298 unsigned long iflags;
2299
7c07d613
JB		 2300 read_lock_irqsave(&sg_index_lock, iflags);
2301 sdp = idr_find(&sg_index_idr, dev);
2302 read_unlock_irqrestore(&sg_index_lock, iflags);
2303
1da177e4
LT		 2304 return sdp;
2305}
2306
2307#ifdef CONFIG_SCSI_PROC_FS
2308
2309static struct proc_dir_entry *sg_proc_sgp = NULL;
2310
2311static char sg_proc_sg_dirname[] = "scsi/sg";
2312
2313static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2314
2315static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2316static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2317 size_t count, loff_t *off);
2318static struct file_operations adio_fops = {
2319 /* .owner, .read and .llseek added in sg_proc_init() */
2320 .open = sg_proc_single_open_adio,
2321 .write = sg_proc_write_adio,
2322 .release = single_release,
2323};
2324
2325static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2326static ssize_t sg_proc_write_dressz(struct file *filp,
2327 const char __user *buffer, size_t count, loff_t *off);
2328static struct file_operations dressz_fops = {
2329 .open = sg_proc_single_open_dressz,
2330 .write = sg_proc_write_dressz,
2331 .release = single_release,
2332};
2333
2334static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2335static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2336static struct file_operations version_fops = {
2337 .open = sg_proc_single_open_version,
2338 .release = single_release,
2339};
2340
2341static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2342static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2343static struct file_operations devhdr_fops = {
2344 .open = sg_proc_single_open_devhdr,
2345 .release = single_release,
2346};
2347
2348static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2349static int sg_proc_open_dev(struct inode *inode, struct file *file);
2350static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2351static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2352static void dev_seq_stop(struct seq_file *s, void *v);
2353static struct file_operations dev_fops = {
2354 .open = sg_proc_open_dev,
2355 .release = seq_release,
2356};
2357static struct seq_operations dev_seq_ops = {
2358 .start = dev_seq_start,
2359 .next = dev_seq_next,
2360 .stop = dev_seq_stop,
2361 .show = sg_proc_seq_show_dev,
2362};
2363
2364static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2365static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2366static struct file_operations devstrs_fops = {
2367 .open = sg_proc_open_devstrs,
2368 .release = seq_release,
2369};
2370static struct seq_operations devstrs_seq_ops = {
2371 .start = dev_seq_start,
2372 .next = dev_seq_next,
2373 .stop = dev_seq_stop,
2374 .show = sg_proc_seq_show_devstrs,
2375};
2376
2377static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2378static int sg_proc_open_debug(struct inode *inode, struct file *file);
2379static struct file_operations debug_fops = {
2380 .open = sg_proc_open_debug,
2381 .release = seq_release,
2382};
2383static struct seq_operations debug_seq_ops = {
2384 .start = dev_seq_start,
2385 .next = dev_seq_next,
2386 .stop = dev_seq_stop,
2387 .show = sg_proc_seq_show_debug,
2388};
2389
2390
2391struct sg_proc_leaf {
2392 const char * name;
2393 struct file_operations * fops;
2394};
2395
2396static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2397 {"allow_dio", &adio_fops},
2398 {"debug", &debug_fops},
2399 {"def_reserved_size", &dressz_fops},
2400 {"device_hdr", &devhdr_fops},
2401 {"devices", &dev_fops},
2402 {"device_strs", &devstrs_fops},
2403 {"version", &version_fops}
2404};
2405
2406static int
2407sg_proc_init(void)
2408{
2409 int k, mask;
6391a113 2410 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2411 struct sg_proc_leaf * leaf;
2412
66600221 2413 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2414 if (!sg_proc_sgp)
2415 return 1;
2416 for (k = 0; k < num_leaves; ++k) {
2417 leaf = &sg_proc_leaf_arr[k];
2418 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f
DL		 2419 leaf->fops->owner = THIS_MODULE;
2420 leaf->fops->read = seq_read;
2421 leaf->fops->llseek = seq_lseek;
2422 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2423 }
2424 return 0;
2425}
2426
2427static void
2428sg_proc_cleanup(void)
2429{
2430 int k;
6391a113 2431 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2432
2433 if (!sg_proc_sgp)
2434 return;
2435 for (k = 0; k < num_leaves; ++k)
2436 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2437 remove_proc_entry(sg_proc_sg_dirname, NULL);
2438}
2439
2440
2441static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2442{
2443 seq_printf(s, "%d\n", *((int *)s->private));
2444 return 0;
2445}
2446
2447static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2448{
2449 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2450}
2451
2452static ssize_t
2453sg_proc_write_adio(struct file *filp, const char __user *buffer,
2454 size_t count, loff_t *off)
2455{
2456 int num;
2457 char buff[11];
2458
2459 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2460 return -EACCES;
2461 num = (count < 10) ? count : 10;
2462 if (copy_from_user(buff, buffer, num))
2463 return -EFAULT;
2464 buff[num] = '\0';
2465 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2466 return count;
2467}
2468
2469static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2470{
2471 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2472}
2473
2474static ssize_t
2475sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2476 size_t count, loff_t *off)
2477{
2478 int num;
2479 unsigned long k = ULONG_MAX;
2480 char buff[11];
2481
2482 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2483 return -EACCES;
2484 num = (count < 10) ? count : 10;
2485 if (copy_from_user(buff, buffer, num))
2486 return -EFAULT;
2487 buff[num] = '\0';
2488 k = simple_strtoul(buff, NULL, 10);
2489 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2490 sg_big_buff = k;
2491 return count;
2492 }
2493 return -ERANGE;
2494}
2495
2496static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2497{
2498 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2499 sg_version_date);
2500 return 0;
2501}
2502
2503static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2504{
2505 return single_open(file, sg_proc_seq_show_version, NULL);
2506}
2507
2508static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2509{
2510 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2511 "online\n");
2512 return 0;
2513}
2514
2515static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2516{
2517 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2518}
2519
2520struct sg_proc_deviter {
2521 loff_t index;
2522 size_t max;
2523};
2524
2525static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2526{
2527 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2528
729d70f5 2529 s->private = it;
1da177e4
LT		 2530 if (! it)
2531 return NULL;
729d70f5 2532
1da177e4
LT		 2533 it->index = *pos;
2534 it->max = sg_last_dev();
2535 if (it->index >= it->max)
729d70f5 2536 return NULL;
1da177e4 2537 return it;
1da177e4
LT		 2538}
2539
2540static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2541{
729d70f5 2542 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2543
2544 *pos = ++it->index;
2545 return (it->index < it->max) ? it : NULL;
2546}
2547
2548static void dev_seq_stop(struct seq_file *s, void *v)
2549{
729d70f5 2550 kfree(s->private);
1da177e4
LT		 2551}
2552
2553static int sg_proc_open_dev(struct inode *inode, struct file *file)
2554{
2555 return seq_open(file, &dev_seq_ops);
2556}
2557
2558static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2559{
2560 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2561 Sg_device *sdp;
2562 struct scsi_device *scsidp;
2563
2564 sdp = it ? sg_get_dev(it->index) : NULL;
2565 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2566 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2567 scsidp->host->host_no, scsidp->channel,
2568 scsidp->id, scsidp->lun, (int) scsidp->type,
2569 1,
2570 (int) scsidp->queue_depth,
2571 (int) scsidp->device_busy,
2572 (int) scsi_device_online(scsidp));
2573 else
2574 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2575 return 0;
2576}
2577
2578static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2579{
2580 return seq_open(file, &devstrs_seq_ops);
2581}
2582
2583static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2584{
2585 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2586 Sg_device *sdp;
2587 struct scsi_device *scsidp;
2588
2589 sdp = it ? sg_get_dev(it->index) : NULL;
2590 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2591 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2592 scsidp->vendor, scsidp->model, scsidp->rev);
2593 else
2594 seq_printf(s, "<no active device>\n");
2595 return 0;
2596}
2597
2598static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2599{
2600 int k, m, new_interface, blen, usg;
2601 Sg_request *srp;
2602 Sg_fd *fp;
2603 const sg_io_hdr_t *hp;
2604 const char * cp;
cb59e840 2605 unsigned int ms;
1da177e4
LT		 2606
2607 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2608 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2609 "(res)sgat=%d low_dma=%d\n", k + 1,
2610 jiffies_to_msecs(fp->timeout),
2611 fp->reserve.bufflen,
2612 (int) fp->reserve.k_use_sg,
2613 (int) fp->low_dma);
2614 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2615 (int) fp->cmd_q, (int) fp->force_packid,
2616 (int) fp->keep_orphan, (int) fp->closed);
2617 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2618 hp = &srp->header;
2619 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2620 if (srp->res_used) {
2621 if (new_interface &&
2622 (SG_FLAG_MMAP_IO & hp->flags))
2623 cp = " mmap>> ";
2624 else
2625 cp = " rb>> ";
2626 } else {
2627 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2628 cp = " dio>> ";
2629 else
2630 cp = " ";
2631 }
2632 seq_printf(s, cp);
d6b10348
MC		 2633 blen = srp->data.bufflen;
2634 usg = srp->data.k_use_sg;
1da177e4
LT		 2635 seq_printf(s, srp->done ?
2636 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2637 : "act:");
1da177e4
LT		 2638 seq_printf(s, " id=%d blen=%d",
2639 srp->header.pack_id, blen);
2640 if (srp->done)
2641 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 2642 else {
2643 ms = jiffies_to_msecs(jiffies);
1da177e4 2644 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 2645 (new_interface ? hp->timeout :
2646 jiffies_to_msecs(fp->timeout)),
2647 (ms > hp->duration ? ms - hp->duration : 0));
2648 }
1da177e4
LT		 2649 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2650 (int) srp->data.cmd_opcode);
2651 }
2652 if (0 == m)
2653 seq_printf(s, " No requests active\n");
2654 }
2655}
2656
2657static int sg_proc_open_debug(struct inode *inode, struct file *file)
2658{
2659 return seq_open(file, &debug_seq_ops);
2660}
2661
2662static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2663{
2664 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2665 Sg_device *sdp;
2666
2667 if (it && (0 == it->index)) {
7c07d613
JB		 2668 seq_printf(s, "max_active_device=%d(origin 1)\n",
2669 (int)it->max);
1da177e4
LT		 2670 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2671 }
2672 sdp = it ? sg_get_dev(it->index) : NULL;
2673 if (sdp) {
2674 struct scsi_device *scsidp = sdp->device;
2675
2676 if (NULL == scsidp) {
2677 seq_printf(s, "device %d detached ??\n",
2678 (int)it->index);
2679 return 0;
2680 }
2681
2682 if (sg_get_nth_sfp(sdp, 0)) {
2683 seq_printf(s, " >>> device=%s ",
2684 sdp->disk->disk_name);
2685 if (sdp->detached)
2686 seq_printf(s, "detached pending close ");
2687 else
2688 seq_printf
2689 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2690 scsidp->host->host_no,
2691 scsidp->channel, scsidp->id,
2692 scsidp->lun,
2693 scsidp->host->hostt->emulated);
2694 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2695 sdp->sg_tablesize, sdp->exclude);
2696 }
2697 sg_proc_debug_helper(s, sdp);
2698 }
2699 return 0;
2700}
2701
2702#endif /* CONFIG_SCSI_PROC_FS */
2703
2704module_init(init_sg);
2705module_exit(exit_sg);
kernel source for telekom puls (alcatel/mediatek)