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mm: prepare VM_DONTDUMP for using in drivers
[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>
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>
c45d15d2 52#include <linux/mutex.h>
2fe038e3 53#include <linux/ratelimit.h>
1da177e4
LT		 54
55#include "scsi.h"
db9dff36 56#include <scsi/scsi_dbg.h>
1da177e4
LT		 57#include <scsi/scsi_host.h>
58#include <scsi/scsi_driver.h>
59#include <scsi/scsi_ioctl.h>
60#include <scsi/sg.h>
61
62#include "scsi_logging.h"
63
64#ifdef CONFIG_SCSI_PROC_FS
65#include <linux/proc_fs.h>
7ca63cb4 66static char *sg_version_date = "20061027";
1da177e4
LT		 67
68static int sg_proc_init(void);
69static void sg_proc_cleanup(void);
70#endif
71
1da177e4 72#define SG_ALLOW_DIO_DEF 0
1da177e4
LT		 73
74#define SG_MAX_DEVS 32768
75
76/*
77 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
78 * Then when using 32 bit integers x * m may overflow during the calculation.
79 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
80 * calculates the same, but prevents the overflow when both m and d
81 * are "small" numbers (like HZ and USER_HZ).
82 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
83 * in 32 bits.
84 */
85#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
86
87#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
88
89int sg_big_buff = SG_DEF_RESERVED_SIZE;
90/* N.B. This variable is readable and writeable via
91 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
92 of this size (or less if there is not enough memory) will be reserved
93 for use by this file descriptor. [Deprecated usage: this variable is also
94 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
95 the kernel (i.e. it is not a module).] */
96static int def_reserved_size = -1; /* picks up init parameter */
97static int sg_allow_dio = SG_ALLOW_DIO_DEF;
98
6460e75a
DG		 99static int scatter_elem_sz = SG_SCATTER_SZ;
100static int scatter_elem_sz_prev = SG_SCATTER_SZ;
101
1da177e4 102#define SG_SECTOR_SZ 512
1da177e4 103
ee959b00
TJ		 104static int sg_add(struct device *, struct class_interface *);
105static void sg_remove(struct device *, struct class_interface *);
1da177e4 106
b499e524 107static DEFINE_SPINLOCK(sg_open_exclusive_lock);
c45d15d2 108
7c07d613
JB		 109static DEFINE_IDR(sg_index_idr);
110static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
1da177e4
LT		 111 file descriptor list for device */
112
113static struct class_interface sg_interface = {
ee959b00
TJ		 114 .add_dev = sg_add,
115 .remove_dev = sg_remove,
1da177e4
LT		 116};
117
118typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
119 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 120 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4 121 unsigned bufflen; /* Size of (aggregate) data buffer */
10db10d1
FT		 122 struct page **pages;
123 int page_order;
1da177e4
LT		 124 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
125 unsigned char cmd_opcode; /* first byte of command */
126} Sg_scatter_hold;
127
128struct sg_device; /* forward declarations */
129struct sg_fd;
130
131typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 132 struct sg_request *nextrp; /* NULL -> tail request (slist) */
133 struct sg_fd *parentfp; /* NULL -> not in use */
134 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
135 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 136 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 137 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
138 char orphan; /* 1 -> drop on sight, 0 -> normal */
139 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
6acddc5e
JE		 140 /* done protected by rq_list_lock */
141 char done; /* 0->before bh, 1->before read, 2->read */
10865dfa 142 struct request *rq;
6e5a30cb 143 struct bio *bio;
c96952ed 144 struct execute_work ew;
1da177e4
LT		 145} Sg_request;
146
147typedef struct sg_fd { /* holds the state of a file descriptor */
035d12e6 148 /* sfd_siblings is protected by sg_index_lock */
3442f802 149 struct list_head sfd_siblings;
1da177e4
LT		 150 struct sg_device *parentdp; /* owning device */
151 wait_queue_head_t read_wait; /* queue read until command done */
152 rwlock_t rq_list_lock; /* protect access to list in req_arr */
153 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
154 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
155 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
156 unsigned save_scat_len; /* original length of trunc. scat. element */
157 Sg_request *headrp; /* head of request slist, NULL->empty */
158 struct fasync_struct *async_qp; /* used by asynchronous notification */
159 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
160 char low_dma; /* as in parent but possibly overridden to 1 */
161 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
1da177e4
LT		 162 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
163 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
164 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
165 char mmap_called; /* 0 -> mmap() never called on this fd */
c6517b79
TB		 166 struct kref f_ref;
167 struct execute_work ew;
1da177e4
LT		 168} Sg_fd;
169
170typedef struct sg_device { /* holds the state of each scsi generic device */
171 struct scsi_device *device;
172 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
173 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 174 u32 index; /* device index number */
035d12e6 175 /* sfds is protected by sg_index_lock */
3442f802 176 struct list_head sfds;
1da177e4 177 volatile char detached; /* 0->attached, 1->detached pending removal */
b499e524
JE		 178 /* exclude protected by sg_open_exclusive_lock */
179 char exclude; /* opened for exclusive access */
1da177e4
LT		 180 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
181 struct gendisk *disk;
182 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
c6517b79 183 struct kref d_ref;
1da177e4
LT		 184} Sg_device;
185
d6b10348 186/* tasklet or soft irq callback */
a91a3a20 187static void sg_rq_end_io(struct request *rq, int uptodate);
10865dfa 188static int sg_start_req(Sg_request *srp, unsigned char *cmd);
e7ee4cc0 189static int sg_finish_rem_req(Sg_request * srp);
1da177e4 190static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
1da177e4
LT		 191static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
192 Sg_request * srp);
0b07de85
AG		 193static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
194 const char __user *buf, size_t count, int blocking,
a2dd3b4c 195 int read_only, int sg_io_owned, Sg_request **o_srp);
1da177e4
LT		 196static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
197 unsigned char *cmnd, int timeout, int blocking);
1da177e4
LT		 198static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
199static void sg_remove_scat(Sg_scatter_hold * schp);
200static void sg_build_reserve(Sg_fd * sfp, int req_size);
201static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
202static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
1da177e4 203static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
c6517b79 204static void sg_remove_sfp(struct kref *);
1da177e4
LT		 205static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
206static Sg_request *sg_add_request(Sg_fd * sfp);
207static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
208static int sg_res_in_use(Sg_fd * sfp);
1da177e4 209static Sg_device *sg_get_dev(int dev);
c6517b79 210static void sg_put_dev(Sg_device *sdp);
1da177e4 211
1da177e4
LT		 212#define SZ_SG_HEADER sizeof(struct sg_header)
213#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
214#define SZ_SG_IOVEC sizeof(sg_iovec_t)
215#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
216
14e507b8
FT		 217static int sg_allow_access(struct file *filp, unsigned char *cmd)
218{
35df8397 219 struct sg_fd *sfp = filp->private_data;
14e507b8
FT		 220
221 if (sfp->parentdp->device->type == TYPE_SCANNER)
222 return 0;
223
018e0446 224 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
14e507b8
FT		 225}
226
b499e524
JE		 227static int get_exclude(Sg_device *sdp)
228{
229 unsigned long flags;
230 int ret;
231
232 spin_lock_irqsave(&sg_open_exclusive_lock, flags);
233 ret = sdp->exclude;
234 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags);
235 return ret;
236}
237
238static int set_exclude(Sg_device *sdp, char val)
239{
240 unsigned long flags;
241
242 spin_lock_irqsave(&sg_open_exclusive_lock, flags);
243 sdp->exclude = val;
244 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags);
245 return val;
246}
247
035d12e6
JE		 248static int sfds_list_empty(Sg_device *sdp)
249{
250 unsigned long flags;
251 int ret;
252
253 read_lock_irqsave(&sg_index_lock, flags);
254 ret = list_empty(&sdp->sfds);
255 read_unlock_irqrestore(&sg_index_lock, flags);
256 return ret;
257}
258
1da177e4
LT		 259static int
260sg_open(struct inode *inode, struct file *filp)
261{
262 int dev = iminor(inode);
263 int flags = filp->f_flags;
d6b10348 264 struct request_queue *q;
1da177e4
LT		 265 Sg_device *sdp;
266 Sg_fd *sfp;
267 int res;
268 int retval;
269
270 nonseekable_open(inode, filp);
271 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
272 sdp = sg_get_dev(dev);
c6517b79
TB		 273 if (IS_ERR(sdp)) {
274 retval = PTR_ERR(sdp);
275 sdp = NULL;
276 goto sg_put;
eb09d3d4 277 }
1da177e4
LT		 278
279 /* This driver's module count bumped by fops_get in <linux/fs.h> */
280 /* Prevent the device driver from vanishing while we sleep */
281 retval = scsi_device_get(sdp->device);
c6517b79
TB		 282 if (retval)
283 goto sg_put;
1da177e4 284
bc4f2401
AS		 285 retval = scsi_autopm_get_device(sdp->device);
286 if (retval)
287 goto sdp_put;
288
1da177e4
LT		 289 if (!((flags & O_NONBLOCK) ||
290 scsi_block_when_processing_errors(sdp->device))) {
291 retval = -ENXIO;
292 /* we are in error recovery for this device */
293 goto error_out;
294 }
295
296 if (flags & O_EXCL) {
297 if (O_RDONLY == (flags & O_ACCMODE)) {
298 retval = -EPERM; /* Can't lock it with read only access */
299 goto error_out;
300 }
035d12e6 301 if (!sfds_list_empty(sdp) && (flags & O_NONBLOCK)) {
1da177e4
LT		 302 retval = -EBUSY;
303 goto error_out;
304 }
3f0c6aba 305 res = wait_event_interruptible(sdp->o_excl_wait,
035d12e6 306 ((!sfds_list_empty(sdp) || get_exclude(sdp)) ? 0 : set_exclude(sdp, 1)));
1da177e4
LT		 307 if (res) {
308 retval = res; /* -ERESTARTSYS because signal hit process */
309 goto error_out;
310 }
b499e524 311 } else if (get_exclude(sdp)) { /* some other fd has an exclusive lock on dev */
1da177e4
LT		 312 if (flags & O_NONBLOCK) {
313 retval = -EBUSY;
314 goto error_out;
315 }
b499e524 316 res = wait_event_interruptible(sdp->o_excl_wait, !get_exclude(sdp));
1da177e4
LT		 317 if (res) {
318 retval = res; /* -ERESTARTSYS because signal hit process */
319 goto error_out;
320 }
321 }
322 if (sdp->detached) {
323 retval = -ENODEV;
324 goto error_out;
325 }
035d12e6 326 if (sfds_list_empty(sdp)) { /* no existing opens on this device */
1da177e4 327 sdp->sgdebug = 0;
d6b10348 328 q = sdp->device->request_queue;
8a78362c 329 sdp->sg_tablesize = queue_max_segments(q);
1da177e4
LT		 330 }
331 if ((sfp = sg_add_sfp(sdp, dev)))
332 filp->private_data = sfp;
333 else {
c6517b79 334 if (flags & O_EXCL) {
b499e524 335 set_exclude(sdp, 0); /* undo if error */
c6517b79
TB		 336 wake_up_interruptible(&sdp->o_excl_wait);
337 }
1da177e4
LT		 338 retval = -ENOMEM;
339 goto error_out;
340 }
c6517b79
TB		 341 retval = 0;
342error_out:
bc4f2401
AS		 343 if (retval) {
344 scsi_autopm_put_device(sdp->device);
345sdp_put:
c6517b79 346 scsi_device_put(sdp->device);
bc4f2401 347 }
c6517b79
TB		 348sg_put:
349 if (sdp)
350 sg_put_dev(sdp);
1da177e4
LT		 351 return retval;
352}
353
354/* Following function was formerly called 'sg_close' */
355static int
356sg_release(struct inode *inode, struct file *filp)
357{
358 Sg_device *sdp;
359 Sg_fd *sfp;
360
361 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
362 return -ENXIO;
363 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
c6517b79 364
b499e524 365 set_exclude(sdp, 0);
c6517b79
TB		 366 wake_up_interruptible(&sdp->o_excl_wait);
367
bc4f2401 368 scsi_autopm_put_device(sdp->device);
c6517b79 369 kref_put(&sfp->f_ref, sg_remove_sfp);
1da177e4
LT		 370 return 0;
371}
372
373static ssize_t
374sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
375{
1da177e4
LT		 376 Sg_device *sdp;
377 Sg_fd *sfp;
378 Sg_request *srp;
379 int req_pack_id = -1;
1da177e4 380 sg_io_hdr_t *hp;
cb59e840
DG		 381 struct sg_header *old_hdr = NULL;
382 int retval = 0;
1da177e4
LT		 383
384 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
385 return -ENXIO;
386 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
387 sdp->disk->disk_name, (int) count));
d6b10348 388
1da177e4
LT		 389 if (!access_ok(VERIFY_WRITE, buf, count))
390 return -EFAULT;
391 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840
DG		 392 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
393 if (!old_hdr)
394 return -ENOMEM;
395 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
396 retval = -EFAULT;
397 goto free_old_hdr;
398 }
399 if (old_hdr->reply_len < 0) {
1da177e4 400 if (count >= SZ_SG_IO_HDR) {
cb59e840
DG		 401 sg_io_hdr_t *new_hdr;
402 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
403 if (!new_hdr) {
404 retval = -ENOMEM;
405 goto free_old_hdr;
406 }
407 retval =__copy_from_user
408 (new_hdr, buf, SZ_SG_IO_HDR);
409 req_pack_id = new_hdr->pack_id;
410 kfree(new_hdr);
411 if (retval) {
412 retval = -EFAULT;
413 goto free_old_hdr;
414 }
1da177e4
LT		 415 }
416 } else
cb59e840 417 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 418 }
419 srp = sg_get_rq_mark(sfp, req_pack_id);
420 if (!srp) { /* now wait on packet to arrive */
cb59e840
DG		 421 if (sdp->detached) {
422 retval = -ENODEV;
423 goto free_old_hdr;
424 }
425 if (filp->f_flags & O_NONBLOCK) {
426 retval = -EAGAIN;
427 goto free_old_hdr;
428 }
3f0c6aba 429 retval = wait_event_interruptible(sfp->read_wait,
794c10fa 430 (sdp->detached ||
3f0c6aba 431 (srp = sg_get_rq_mark(sfp, req_pack_id))));
794c10fa
JE		 432 if (sdp->detached) {
433 retval = -ENODEV;
434 goto free_old_hdr;
435 }
436 if (retval) {
cb59e840
DG		 437 /* -ERESTARTSYS as signal hit process */
438 goto free_old_hdr;
1da177e4
LT		 439 }
440 }
cb59e840
DG		 441 if (srp->header.interface_id != '\0') {
442 retval = sg_new_read(sfp, buf, count, srp);
443 goto free_old_hdr;
444 }
1da177e4
LT		 445
446 hp = &srp->header;
cb59e840
DG		 447 if (old_hdr == NULL) {
448 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
449 if (! old_hdr) {
450 retval = -ENOMEM;
451 goto free_old_hdr;
452 }
453 }
454 memset(old_hdr, 0, SZ_SG_HEADER);
455 old_hdr->reply_len = (int) hp->timeout;
456 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
457 old_hdr->pack_id = hp->pack_id;
458 old_hdr->twelve_byte =
1da177e4 459 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840
DG		 460 old_hdr->target_status = hp->masked_status;
461 old_hdr->host_status = hp->host_status;
462 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 463 if ((CHECK_CONDITION & hp->masked_status) ||
464 (DRIVER_SENSE & hp->driver_status))
cb59e840
DG		 465 memcpy(old_hdr->sense_buffer, srp->sense_b,
466 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 467 switch (hp->host_status) {
468 /* This setup of 'result' is for backward compatibility and is best
469 ignored by the user who should use target, host + driver status */
470 case DID_OK:
471 case DID_PASSTHROUGH:
472 case DID_SOFT_ERROR:
cb59e840 473 old_hdr->result = 0;
1da177e4
LT		 474 break;
475 case DID_NO_CONNECT:
476 case DID_BUS_BUSY:
477 case DID_TIME_OUT:
cb59e840 478 old_hdr->result = EBUSY;
1da177e4
LT		 479 break;
480 case DID_BAD_TARGET:
481 case DID_ABORT:
482 case DID_PARITY:
483 case DID_RESET:
484 case DID_BAD_INTR:
cb59e840 485 old_hdr->result = EIO;
1da177e4
LT		 486 break;
487 case DID_ERROR:
cb59e840 488 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 489 hp->masked_status == GOOD) ? 0 : EIO;
490 break;
491 default:
cb59e840 492 old_hdr->result = EIO;
1da177e4
LT		 493 break;
494 }
495
496 /* Now copy the result back to the user buffer. */
497 if (count >= SZ_SG_HEADER) {
cb59e840
DG		 498 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
499 retval = -EFAULT;
500 goto free_old_hdr;
501 }
1da177e4 502 buf += SZ_SG_HEADER;
cb59e840
DG		 503 if (count > old_hdr->reply_len)
504 count = old_hdr->reply_len;
1da177e4 505 if (count > SZ_SG_HEADER) {
cb59e840
DG		 506 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
507 retval = -EFAULT;
508 goto free_old_hdr;
509 }
1da177e4
LT		 510 }
511 } else
cb59e840 512 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 513 sg_finish_rem_req(srp);
cb59e840
DG		 514 retval = count;
515free_old_hdr:
c9475cb0 516 kfree(old_hdr);
cb59e840 517 return retval;
1da177e4
LT		 518}
519
520static ssize_t
521sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
522{
523 sg_io_hdr_t *hp = &srp->header;
524 int err = 0;
525 int len;
526
527 if (count < SZ_SG_IO_HDR) {
528 err = -EINVAL;
529 goto err_out;
530 }
531 hp->sb_len_wr = 0;
532 if ((hp->mx_sb_len > 0) && hp->sbp) {
533 if ((CHECK_CONDITION & hp->masked_status) ||
534 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 535 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 536 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
537 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
538 len = (len > sb_len) ? sb_len : len;
539 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
540 err = -EFAULT;
541 goto err_out;
542 }
543 hp->sb_len_wr = len;
544 }
545 }
546 if (hp->masked_status || hp->host_status || hp->driver_status)
547 hp->info |= SG_INFO_CHECK;
548 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
549 err = -EFAULT;
550 goto err_out;
551 }
0b6cb26c 552err_out:
e7ee4cc0 553 err = sg_finish_rem_req(srp);
1da177e4
LT		 554 return (0 == err) ? count : err;
555}
556
557static ssize_t
558sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
559{
560 int mxsize, cmd_size, k;
561 int input_size, blocking;
562 unsigned char opcode;
563 Sg_device *sdp;
564 Sg_fd *sfp;
565 Sg_request *srp;
566 struct sg_header old_hdr;
567 sg_io_hdr_t *hp;
d6b10348 568 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 569
570 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
571 return -ENXIO;
572 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
573 sdp->disk->disk_name, (int) count));
574 if (sdp->detached)
575 return -ENODEV;
576 if (!((filp->f_flags & O_NONBLOCK) ||
577 scsi_block_when_processing_errors(sdp->device)))
578 return -ENXIO;
579
580 if (!access_ok(VERIFY_READ, buf, count))
581 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
582 if (count < SZ_SG_HEADER)
583 return -EIO;
584 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
585 return -EFAULT;
586 blocking = !(filp->f_flags & O_NONBLOCK);
587 if (old_hdr.reply_len < 0)
a2dd3b4c
TB		 588 return sg_new_write(sfp, filp, buf, count,
589 blocking, 0, 0, NULL);
1da177e4
LT		 590 if (count < (SZ_SG_HEADER + 6))
591 return -EIO; /* The minimum scsi command length is 6 bytes. */
592
593 if (!(srp = sg_add_request(sfp))) {
594 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
595 return -EDOM;
596 }
597 buf += SZ_SG_HEADER;
598 __get_user(opcode, buf);
599 if (sfp->next_cmd_len > 0) {
600 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
601 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
602 sfp->next_cmd_len = 0;
603 sg_remove_request(sfp, srp);
604 return -EIO;
605 }
606 cmd_size = sfp->next_cmd_len;
607 sfp->next_cmd_len = 0; /* reset so only this write() effected */
608 } else {
609 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
610 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
611 cmd_size = 12;
612 }
613 SCSI_LOG_TIMEOUT(4, printk(
614 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
615/* Determine buffer size. */
616 input_size = count - cmd_size;
617 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
618 mxsize -= SZ_SG_HEADER;
619 input_size -= SZ_SG_HEADER;
620 if (input_size < 0) {
621 sg_remove_request(sfp, srp);
622 return -EIO; /* User did not pass enough bytes for this command. */
623 }
624 hp = &srp->header;
625 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
626 hp->cmd_len = (unsigned char) cmd_size;
627 hp->iovec_count = 0;
628 hp->mx_sb_len = 0;
629 if (input_size > 0)
630 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
631 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
632 else
633 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
634 hp->dxfer_len = mxsize;
fad7f01e
FT		 635 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
636 hp->dxferp = (char __user *)buf + cmd_size;
637 else
638 hp->dxferp = NULL;
1da177e4
LT		 639 hp->sbp = NULL;
640 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
641 hp->flags = input_size; /* structure abuse ... */
642 hp->pack_id = old_hdr.pack_id;
643 hp->usr_ptr = NULL;
644 if (__copy_from_user(cmnd, buf, cmd_size))
645 return -EFAULT;
646 /*
647 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
648 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
649 * is a non-zero input_size, so emit a warning.
650 */
eaa3e22e
AK		 651 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
652 static char cmd[TASK_COMM_LEN];
2fe038e3
CD		 653 if (strcmp(current->comm, cmd)) {
654 printk_ratelimited(KERN_WARNING
655 "sg_write: data in/out %d/%d bytes "
656 "for SCSI command 0x%x-- guessing "
657 "data in;\n program %s not setting "
658 "count and/or reply_len properly\n",
659 old_hdr.reply_len - (int)SZ_SG_HEADER,
660 input_size, (unsigned int) cmnd[0],
661 current->comm);
eaa3e22e
AK		 662 strcpy(cmd, current->comm);
663 }
664 }
1da177e4
LT		 665 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
666 return (k < 0) ? k : count;
667}
668
669static ssize_t
0b07de85 670sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
a2dd3b4c 671 size_t count, int blocking, int read_only, int sg_io_owned,
0b07de85 672 Sg_request **o_srp)
1da177e4
LT		 673{
674 int k;
675 Sg_request *srp;
676 sg_io_hdr_t *hp;
d6b10348 677 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 678 int timeout;
679 unsigned long ul_timeout;
680
681 if (count < SZ_SG_IO_HDR)
682 return -EINVAL;
683 if (!access_ok(VERIFY_READ, buf, count))
684 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
685
686 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
687 if (!(srp = sg_add_request(sfp))) {
688 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
689 return -EDOM;
690 }
a2dd3b4c 691 srp->sg_io_owned = sg_io_owned;
1da177e4
LT		 692 hp = &srp->header;
693 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
694 sg_remove_request(sfp, srp);
695 return -EFAULT;
696 }
697 if (hp->interface_id != 'S') {
698 sg_remove_request(sfp, srp);
699 return -ENOSYS;
700 }
701 if (hp->flags & SG_FLAG_MMAP_IO) {
702 if (hp->dxfer_len > sfp->reserve.bufflen) {
703 sg_remove_request(sfp, srp);
704 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
705 }
706 if (hp->flags & SG_FLAG_DIRECT_IO) {
707 sg_remove_request(sfp, srp);
708 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
709 }
710 if (sg_res_in_use(sfp)) {
711 sg_remove_request(sfp, srp);
712 return -EBUSY; /* reserve buffer already being used */
713 }
714 }
715 ul_timeout = msecs_to_jiffies(srp->header.timeout);
716 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
717 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
718 sg_remove_request(sfp, srp);
719 return -EMSGSIZE;
720 }
721 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
722 sg_remove_request(sfp, srp);
723 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
724 }
725 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
726 sg_remove_request(sfp, srp);
727 return -EFAULT;
728 }
14e507b8 729 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 730 sg_remove_request(sfp, srp);
731 return -EPERM;
732 }
733 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
734 if (k < 0)
735 return k;
736 if (o_srp)
737 *o_srp = srp;
738 return count;
739}
740
741static int
742sg_common_write(Sg_fd * sfp, Sg_request * srp,
743 unsigned char *cmnd, int timeout, int blocking)
744{
d6b10348 745 int k, data_dir;
1da177e4
LT		 746 Sg_device *sdp = sfp->parentdp;
747 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 748
749 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
750 hp->status = 0;
751 hp->masked_status = 0;
752 hp->msg_status = 0;
753 hp->info = 0;
754 hp->host_status = 0;
755 hp->driver_status = 0;
756 hp->resid = 0;
757 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
758 (int) cmnd[0], (int) hp->cmd_len));
759
10865dfa
FT		 760 k = sg_start_req(srp, cmnd);
761 if (k) {
7ca63cb4 762 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 763 sg_finish_rem_req(srp);
764 return k; /* probably out of space --> ENOMEM */
765 }
1da177e4 766 if (sdp->detached) {
caf19d38
FT		 767 if (srp->bio)
768 blk_end_request_all(srp->rq, -EIO);
1da177e4
LT		 769 sg_finish_rem_req(srp);
770 return -ENODEV;
771 }
1da177e4 772
1da177e4
LT		 773 switch (hp->dxfer_direction) {
774 case SG_DXFER_TO_FROM_DEV:
775 case SG_DXFER_FROM_DEV:
d6b10348 776 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 777 break;
778 case SG_DXFER_TO_DEV:
d6b10348 779 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 780 break;
781 case SG_DXFER_UNKNOWN:
d6b10348 782 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 783 break;
784 default:
d6b10348 785 data_dir = DMA_NONE;
1da177e4
LT		 786 break;
787 }
cb59e840 788 hp->duration = jiffies_to_msecs(jiffies);
10db10d1
FT		 789
790 srp->rq->timeout = timeout;
c6517b79 791 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
10db10d1
FT		 792 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
793 srp->rq, 1, sg_rq_end_io);
794 return 0;
1da177e4
LT		 795}
796
6acddc5e
JE		 797static int srp_done(Sg_fd *sfp, Sg_request *srp)
798{
799 unsigned long flags;
800 int ret;
801
802 read_lock_irqsave(&sfp->rq_list_lock, flags);
803 ret = srp->done;
804 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
805 return ret;
806}
807
37b9d1e0 808static long
f4927c45 809sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 810{
811 void __user *p = (void __user *)arg;
812 int __user *ip = p;
813 int result, val, read_only;
814 Sg_device *sdp;
815 Sg_fd *sfp;
816 Sg_request *srp;
817 unsigned long iflags;
818
819 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
820 return -ENXIO;
abf54393 821
1da177e4
LT		 822 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
823 sdp->disk->disk_name, (int) cmd_in));
824 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
825
826 switch (cmd_in) {
827 case SG_IO:
dddbf8d9
JE		 828 if (sdp->detached)
829 return -ENODEV;
830 if (!scsi_block_when_processing_errors(sdp->device))
831 return -ENXIO;
832 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
833 return -EFAULT;
834 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
835 1, read_only, 1, &srp);
836 if (result < 0)
837 return result;
3f0c6aba 838 result = wait_event_interruptible(sfp->read_wait,
6acddc5e 839 (srp_done(sfp, srp) || sdp->detached));
794c10fa
JE		 840 if (sdp->detached)
841 return -ENODEV;
842 write_lock_irq(&sfp->rq_list_lock);
843 if (srp->done) {
844 srp->done = 2;
dddbf8d9 845 write_unlock_irq(&sfp->rq_list_lock);
794c10fa
JE		 846 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
847 return (result < 0) ? result : 0;
1da177e4 848 }
794c10fa
JE		 849 srp->orphan = 1;
850 write_unlock_irq(&sfp->rq_list_lock);
851 return result; /* -ERESTARTSYS because signal hit process */
1da177e4
LT		 852 case SG_SET_TIMEOUT:
853 result = get_user(val, ip);
854 if (result)
855 return result;
856 if (val < 0)
857 return -EIO;
858 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
859 val = MULDIV (INT_MAX, USER_HZ, HZ);
860 sfp->timeout_user = val;
861 sfp->timeout = MULDIV (val, HZ, USER_HZ);
862
863 return 0;
864 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
865 /* strange ..., for backward compatibility */
866 return sfp->timeout_user;
867 case SG_SET_FORCE_LOW_DMA:
868 result = get_user(val, ip);
869 if (result)
870 return result;
871 if (val) {
872 sfp->low_dma = 1;
873 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
874 val = (int) sfp->reserve.bufflen;
875 sg_remove_scat(&sfp->reserve);
876 sg_build_reserve(sfp, val);
877 }
878 } else {
879 if (sdp->detached)
880 return -ENODEV;
881 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
882 }
883 return 0;
884 case SG_GET_LOW_DMA:
885 return put_user((int) sfp->low_dma, ip);
886 case SG_GET_SCSI_ID:
887 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
888 return -EFAULT;
889 else {
890 sg_scsi_id_t __user *sg_idp = p;
891
892 if (sdp->detached)
893 return -ENODEV;
894 __put_user((int) sdp->device->host->host_no,
895 &sg_idp->host_no);
896 __put_user((int) sdp->device->channel,
897 &sg_idp->channel);
898 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
899 __put_user((int) sdp->device->lun, &sg_idp->lun);
900 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
901 __put_user((short) sdp->device->host->cmd_per_lun,
902 &sg_idp->h_cmd_per_lun);
903 __put_user((short) sdp->device->queue_depth,
904 &sg_idp->d_queue_depth);
905 __put_user(0, &sg_idp->unused[0]);
906 __put_user(0, &sg_idp->unused[1]);
907 return 0;
908 }
909 case SG_SET_FORCE_PACK_ID:
910 result = get_user(val, ip);
911 if (result)
912 return result;
913 sfp->force_packid = val ? 1 : 0;
914 return 0;
915 case SG_GET_PACK_ID:
916 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
917 return -EFAULT;
918 read_lock_irqsave(&sfp->rq_list_lock, iflags);
919 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
920 if ((1 == srp->done) && (!srp->sg_io_owned)) {
921 read_unlock_irqrestore(&sfp->rq_list_lock,
922 iflags);
923 __put_user(srp->header.pack_id, ip);
924 return 0;
925 }
926 }
927 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
928 __put_user(-1, ip);
929 return 0;
930 case SG_GET_NUM_WAITING:
931 read_lock_irqsave(&sfp->rq_list_lock, iflags);
932 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
933 if ((1 == srp->done) && (!srp->sg_io_owned))
934 ++val;
935 }
936 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
937 return put_user(val, ip);
938 case SG_GET_SG_TABLESIZE:
939 return put_user(sdp->sg_tablesize, ip);
940 case SG_SET_RESERVED_SIZE:
941 result = get_user(val, ip);
942 if (result)
943 return result;
944 if (val < 0)
945 return -EINVAL;
44ec9542 946 val = min_t(int, val,
ae03bf63 947 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 948 if (val != sfp->reserve.bufflen) {
949 if (sg_res_in_use(sfp) || sfp->mmap_called)
950 return -EBUSY;
951 sg_remove_scat(&sfp->reserve);
952 sg_build_reserve(sfp, val);
953 }
954 return 0;
955 case SG_GET_RESERVED_SIZE:
44ec9542 956 val = min_t(int, sfp->reserve.bufflen,
ae03bf63 957 queue_max_sectors(sdp->device->request_queue) * 512);
1da177e4
LT		 958 return put_user(val, ip);
959 case SG_SET_COMMAND_Q:
960 result = get_user(val, ip);
961 if (result)
962 return result;
963 sfp->cmd_q = val ? 1 : 0;
964 return 0;
965 case SG_GET_COMMAND_Q:
966 return put_user((int) sfp->cmd_q, ip);
967 case SG_SET_KEEP_ORPHAN:
968 result = get_user(val, ip);
969 if (result)
970 return result;
971 sfp->keep_orphan = val;
972 return 0;
973 case SG_GET_KEEP_ORPHAN:
974 return put_user((int) sfp->keep_orphan, ip);
975 case SG_NEXT_CMD_LEN:
976 result = get_user(val, ip);
977 if (result)
978 return result;
979 sfp->next_cmd_len = (val > 0) ? val : 0;
980 return 0;
981 case SG_GET_VERSION_NUM:
982 return put_user(sg_version_num, ip);
983 case SG_GET_ACCESS_COUNT:
984 /* faked - we don't have a real access count anymore */
985 val = (sdp->device ? 1 : 0);
986 return put_user(val, ip);
987 case SG_GET_REQUEST_TABLE:
988 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
989 return -EFAULT;
990 else {
cb59e840
DG		 991 sg_req_info_t *rinfo;
992 unsigned int ms;
993
994 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
995 GFP_KERNEL);
996 if (!rinfo)
997 return -ENOMEM;
1da177e4
LT		 998 read_lock_irqsave(&sfp->rq_list_lock, iflags);
999 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1000 ++val, srp = srp ? srp->nextrp : srp) {
1001 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1002 if (srp) {
1003 rinfo[val].req_state = srp->done + 1;
1004 rinfo[val].problem =
1005 srp->header.masked_status &
1006 srp->header.host_status &
1007 srp->header.driver_status;
cb59e840
DG		 1008 if (srp->done)
1009 rinfo[val].duration =
1010 srp->header.duration;
1011 else {
1012 ms = jiffies_to_msecs(jiffies);
1013 rinfo[val].duration =
1014 (ms > srp->header.duration) ?
1015 (ms - srp->header.duration) : 0;
1016 }
1da177e4 1017 rinfo[val].orphan = srp->orphan;
cb59e840
DG		 1018 rinfo[val].sg_io_owned =
1019 srp->sg_io_owned;
1020 rinfo[val].pack_id =
1021 srp->header.pack_id;
1022 rinfo[val].usr_ptr =
1023 srp->header.usr_ptr;
1da177e4
LT		 1024 }
1025 }
1026 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840
DG		 1027 result = __copy_to_user(p, rinfo,
1028 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1029 result = result ? -EFAULT : 0;
1030 kfree(rinfo);
1031 return result;
1da177e4
LT		 1032 }
1033 case SG_EMULATED_HOST:
1034 if (sdp->detached)
1035 return -ENODEV;
1036 return put_user(sdp->device->host->hostt->emulated, ip);
1037 case SG_SCSI_RESET:
1038 if (sdp->detached)
1039 return -ENODEV;
1040 if (filp->f_flags & O_NONBLOCK) {
939647ee 1041 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1042 return -EBUSY;
1043 } else if (!scsi_block_when_processing_errors(sdp->device))
1044 return -EBUSY;
1045 result = get_user(val, ip);
1046 if (result)
1047 return result;
1048 if (SG_SCSI_RESET_NOTHING == val)
1049 return 0;
1050 switch (val) {
1051 case SG_SCSI_RESET_DEVICE:
1052 val = SCSI_TRY_RESET_DEVICE;
1053 break;
39120e11
BK		 1054 case SG_SCSI_RESET_TARGET:
1055 val = SCSI_TRY_RESET_TARGET;
1056 break;
1da177e4
LT		 1057 case SG_SCSI_RESET_BUS:
1058 val = SCSI_TRY_RESET_BUS;
1059 break;
1060 case SG_SCSI_RESET_HOST:
1061 val = SCSI_TRY_RESET_HOST;
1062 break;
1063 default:
1064 return -EINVAL;
1065 }
1066 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1067 return -EACCES;
1068 return (scsi_reset_provider(sdp->device, val) ==
1069 SUCCESS) ? 0 : -EIO;
1070 case SCSI_IOCTL_SEND_COMMAND:
1071 if (sdp->detached)
1072 return -ENODEV;
1073 if (read_only) {
1074 unsigned char opcode = WRITE_6;
1075 Scsi_Ioctl_Command __user *siocp = p;
1076
1077 if (copy_from_user(&opcode, siocp->data, 1))
1078 return -EFAULT;
14e507b8 1079 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1080 return -EPERM;
1081 }
e915e872 1082 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1da177e4
LT		 1083 case SG_SET_DEBUG:
1084 result = get_user(val, ip);
1085 if (result)
1086 return result;
1087 sdp->sgdebug = (char) val;
1088 return 0;
1089 case SCSI_IOCTL_GET_IDLUN:
1090 case SCSI_IOCTL_GET_BUS_NUMBER:
1091 case SCSI_IOCTL_PROBE_HOST:
1092 case SG_GET_TRANSFORM:
1093 if (sdp->detached)
1094 return -ENODEV;
1095 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542 1096 case BLKSECTGET:
ae03bf63 1097 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
44ec9542 1098 ip);
6da127ad
CS		 1099 case BLKTRACESETUP:
1100 return blk_trace_setup(sdp->device->request_queue,
1101 sdp->disk->disk_name,
76e3a19d 1102 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
d0deef5b 1103 NULL,
6da127ad
CS		 1104 (char *)arg);
1105 case BLKTRACESTART:
1106 return blk_trace_startstop(sdp->device->request_queue, 1);
1107 case BLKTRACESTOP:
1108 return blk_trace_startstop(sdp->device->request_queue, 0);
1109 case BLKTRACETEARDOWN:
1110 return blk_trace_remove(sdp->device->request_queue);
1da177e4
LT		 1111 default:
1112 if (read_only)
1113 return -EPERM; /* don't know so take safe approach */
1114 return scsi_ioctl(sdp->device, cmd_in, p);
1115 }
1116}
1117
1118#ifdef CONFIG_COMPAT
1119static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1120{
1121 Sg_device *sdp;
1122 Sg_fd *sfp;
1123 struct scsi_device *sdev;
1124
1125 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1126 return -ENXIO;
1127
1128 sdev = sdp->device;
1129 if (sdev->host->hostt->compat_ioctl) {
1130 int ret;
1131
1132 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1133
1134 return ret;
1135 }
1136
1137 return -ENOIOCTLCMD;
1138}
1139#endif
1140
1141static unsigned int
1142sg_poll(struct file *filp, poll_table * wait)
1143{
1144 unsigned int res = 0;
1145 Sg_device *sdp;
1146 Sg_fd *sfp;
1147 Sg_request *srp;
1148 int count = 0;
1149 unsigned long iflags;
1150
ebaf466b
JE		 1151 sfp = filp->private_data;
1152 if (!sfp)
1153 return POLLERR;
1154 sdp = sfp->parentdp;
1155 if (!sdp)
1da177e4
LT		 1156 return POLLERR;
1157 poll_wait(filp, &sfp->read_wait, wait);
1158 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1159 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1160 /* if any read waiting, flag it */
1161 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1162 res = POLLIN | POLLRDNORM;
1163 ++count;
1164 }
1165 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1166
1167 if (sdp->detached)
1168 res |= POLLHUP;
1169 else if (!sfp->cmd_q) {
1170 if (0 == count)
1171 res |= POLLOUT | POLLWRNORM;
1172 } else if (count < SG_MAX_QUEUE)
1173 res |= POLLOUT | POLLWRNORM;
1174 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1175 sdp->disk->disk_name, (int) res));
1176 return res;
1177}
1178
1179static int
1180sg_fasync(int fd, struct file *filp, int mode)
1181{
1da177e4
LT		 1182 Sg_device *sdp;
1183 Sg_fd *sfp;
1184
1185 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1186 return -ENXIO;
1187 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1188 sdp->disk->disk_name, mode));
1189
60aa4924 1190 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1da177e4
LT		 1191}
1192
a13ff0bb
NP		 1193static int
1194sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1195{
1196 Sg_fd *sfp;
d6b10348 1197 unsigned long offset, len, sa;
1da177e4 1198 Sg_scatter_hold *rsv_schp;
10db10d1 1199 int k, length;
1da177e4
LT		 1200
1201 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1202 return VM_FAULT_SIGBUS;
1da177e4 1203 rsv_schp = &sfp->reserve;
a13ff0bb 1204 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1205 if (offset >= rsv_schp->bufflen)
a13ff0bb
NP		 1206 return VM_FAULT_SIGBUS;
1207 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1da177e4 1208 offset, rsv_schp->k_use_sg));
d6b10348 1209 sa = vma->vm_start;
10db10d1
FT		 1210 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1211 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1212 len = vma->vm_end - sa;
10db10d1 1213 len = (len < length) ? len : length;
d6b10348 1214 if (offset < len) {
10db10d1
FT		 1215 struct page *page = nth_page(rsv_schp->pages[k],
1216 offset >> PAGE_SHIFT);
d6b10348 1217 get_page(page); /* increment page count */
a13ff0bb
NP		 1218 vmf->page = page;
1219 return 0; /* success */
1da177e4 1220 }
d6b10348
MC		 1221 sa += len;
1222 offset -= len;
1da177e4 1223 }
d6b10348 1224
a13ff0bb 1225 return VM_FAULT_SIGBUS;
1da177e4
LT		 1226}
1227
f0f37e2f 1228static const struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1229 .fault = sg_vma_fault,
1da177e4
LT		 1230};
1231
1232static int
1233sg_mmap(struct file *filp, struct vm_area_struct *vma)
1234{
1235 Sg_fd *sfp;
d6b10348 1236 unsigned long req_sz, len, sa;
1da177e4 1237 Sg_scatter_hold *rsv_schp;
10db10d1 1238 int k, length;
1da177e4
LT		 1239
1240 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1241 return -ENXIO;
cb59e840 1242 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1243 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1244 (void *) vma->vm_start, (int) req_sz));
1245 if (vma->vm_pgoff)
1246 return -EINVAL; /* want no offset */
1247 rsv_schp = &sfp->reserve;
1248 if (req_sz > rsv_schp->bufflen)
1249 return -ENOMEM; /* cannot map more than reserved buffer */
1250
d6b10348 1251 sa = vma->vm_start;
10db10d1
FT		 1252 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1253 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1254 len = vma->vm_end - sa;
10db10d1 1255 len = (len < length) ? len : length;
d6b10348 1256 sa += len;
1da177e4 1257 }
d6b10348 1258
f9aed0e2 1259 sfp->mmap_called = 1;
1c8e71d7 1260 vma->vm_flags |= VM_RESERVED;
1da177e4
LT		 1261 vma->vm_private_data = sfp;
1262 vma->vm_ops = &sg_mmap_vm_ops;
1263 return 0;
1264}
1265
c96952ed
FT		 1266static void sg_rq_end_io_usercontext(struct work_struct *work)
1267{
1268 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1269 struct sg_fd *sfp = srp->parentfp;
1270
1271 sg_finish_rem_req(srp);
1272 kref_put(&sfp->f_ref, sg_remove_sfp);
1273}
1274
a91a3a20
FT		 1275/*
1276 * This function is a "bottom half" handler that is called by the mid
1277 * level when a command is completed (or has failed).
1278 */
1279static void sg_rq_end_io(struct request *rq, int uptodate)
1da177e4 1280{
a91a3a20 1281 struct sg_request *srp = rq->end_io_data;
c6517b79 1282 Sg_device *sdp;
1da177e4 1283 Sg_fd *sfp;
1da177e4 1284 unsigned long iflags;
cb59e840 1285 unsigned int ms;
a91a3a20 1286 char *sense;
c6517b79 1287 int result, resid, done = 1;
1da177e4 1288
c6517b79 1289 if (WARN_ON(srp->done != 0))
1da177e4 1290 return;
c6517b79 1291
1da177e4 1292 sfp = srp->parentfp;
c6517b79 1293 if (WARN_ON(sfp == NULL))
1da177e4 1294 return;
c6517b79
TB		 1295
1296 sdp = sfp->parentdp;
1297 if (unlikely(sdp->detached))
1298 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1da177e4 1299
a91a3a20
FT		 1300 sense = rq->sense;
1301 result = rq->errors;
c3a4d78c 1302 resid = rq->resid_len;
1da177e4
LT		 1303
1304 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1305 sdp->disk->disk_name, srp->header.pack_id, result));
1306 srp->header.resid = resid;
cb59e840
DG		 1307 ms = jiffies_to_msecs(jiffies);
1308 srp->header.duration = (ms > srp->header.duration) ?
1309 (ms - srp->header.duration) : 0;
d6b10348 1310 if (0 != result) {
1da177e4
LT		 1311 struct scsi_sense_hdr sshdr;
1312
d6b10348
MC		 1313 srp->header.status = 0xff & result;
1314 srp->header.masked_status = status_byte(result);
1315 srp->header.msg_status = msg_byte(result);
1316 srp->header.host_status = host_byte(result);
1317 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1318 if ((sdp->sgdebug > 0) &&
1319 ((CHECK_CONDITION == srp->header.masked_status) ||
1320 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1321 __scsi_print_sense("sg_cmd_done", sense,
1322 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1323
1324 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1325 if (driver_byte(result) != 0
1326 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1327 && !scsi_sense_is_deferred(&sshdr)
1328 && sshdr.sense_key == UNIT_ATTENTION
1329 && sdp->device->removable) {
1330 /* Detected possible disc change. Set the bit - this */
1331 /* may be used if there are filesystems using this device */
1332 sdp->device->changed = 1;
1333 }
1334 }
1335 /* Rely on write phase to clean out srp status values, so no "else" */
1336
c6517b79
TB		 1337 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1338 if (unlikely(srp->orphan)) {
1da177e4
LT		 1339 if (sfp->keep_orphan)
1340 srp->sg_io_owned = 0;
c6517b79
TB		 1341 else
1342 done = 0;
1da177e4 1343 }
c6517b79
TB		 1344 srp->done = done;
1345 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1346
1347 if (likely(done)) {
1348 /* Now wake up any sg_read() that is waiting for this
1349 * packet.
1350 */
1da177e4 1351 wake_up_interruptible(&sfp->read_wait);
c6517b79 1352 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
c96952ed 1353 kref_put(&sfp->f_ref, sg_remove_sfp);
015640ed
FT		 1354 } else {
1355 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1356 schedule_work(&srp->ew.work);
1357 }
1da177e4
LT		 1358}
1359
828c0950 1360static const struct file_operations sg_fops = {
1da177e4
LT		 1361 .owner = THIS_MODULE,
1362 .read = sg_read,
1363 .write = sg_write,
1364 .poll = sg_poll,
37b9d1e0 1365 .unlocked_ioctl = sg_ioctl,
1da177e4
LT		 1366#ifdef CONFIG_COMPAT
1367 .compat_ioctl = sg_compat_ioctl,
1368#endif
1369 .open = sg_open,
1370 .mmap = sg_mmap,
1371 .release = sg_release,
1372 .fasync = sg_fasync,
6038f373 1373 .llseek = no_llseek,
1da177e4
LT		 1374};
1375
d253878b 1376static struct class *sg_sysfs_class;
1da177e4
LT		 1377
1378static int sg_sysfs_valid = 0;
1379
7c07d613 1380static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1381{
d6b10348 1382 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1383 Sg_device *sdp;
1384 unsigned long iflags;
7c07d613
JB		 1385 int error;
1386 u32 k;
1da177e4 1387
24669f75 1388 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1389 if (!sdp) {
1390 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1391 return ERR_PTR(-ENOMEM);
1392 }
c6517b79 1393
7c07d613
JB		 1394 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1395 printk(KERN_WARNING "idr expansion Sg_device failure\n");
c6517b79 1396 error = -ENOMEM;
7c07d613 1397 goto out;
1da177e4
LT		 1398 }
1399
7c07d613 1400 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4 1401
c6517b79 1402 error = idr_get_new(&sg_index_idr, sdp, &k);
7c07d613 1403 if (error) {
c6517b79 1404 write_unlock_irqrestore(&sg_index_lock, iflags);
7c07d613
JB		 1405 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1406 error);
1407 goto out;
1da177e4
LT		 1408 }
1409
1da177e4
LT		 1410 if (unlikely(k >= SG_MAX_DEVS))
1411 goto overflow;
1412
1da177e4
LT		 1413 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1414 sprintf(disk->disk_name, "sg%d", k);
1415 disk->first_minor = k;
1416 sdp->disk = disk;
1417 sdp->device = scsidp;
3442f802 1418 INIT_LIST_HEAD(&sdp->sfds);
1da177e4 1419 init_waitqueue_head(&sdp->o_excl_wait);
8a78362c 1420 sdp->sg_tablesize = queue_max_segments(q);
7c07d613 1421 sdp->index = k;
c6517b79
TB		 1422 kref_init(&sdp->d_ref);
1423
1424 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 1425
7c07d613 1426 error = 0;
1da177e4 1427 out:
7c07d613 1428 if (error) {
1da177e4 1429 kfree(sdp);
7c07d613
JB		 1430 return ERR_PTR(error);
1431 }
1432 return sdp;
1da177e4
LT		 1433
1434 overflow:
c6517b79
TB		 1435 idr_remove(&sg_index_idr, k);
1436 write_unlock_irqrestore(&sg_index_lock, iflags);
9ccfc756
JB		 1437 sdev_printk(KERN_WARNING, scsidp,
1438 "Unable to attach sg device type=%d, minor "
1439 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1da177e4
LT		 1440 error = -ENODEV;
1441 goto out;
1442}
1443
1444static int
ee959b00 1445sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1446{
ee959b00 1447 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1448 struct gendisk *disk;
1449 Sg_device *sdp = NULL;
1450 struct cdev * cdev = NULL;
7c07d613 1451 int error;
454e8957 1452 unsigned long iflags;
1da177e4
LT		 1453
1454 disk = alloc_disk(1);
1455 if (!disk) {
1456 printk(KERN_WARNING "alloc_disk failed\n");
1457 return -ENOMEM;
1458 }
1459 disk->major = SCSI_GENERIC_MAJOR;
1460
1461 error = -ENOMEM;
1462 cdev = cdev_alloc();
1463 if (!cdev) {
1464 printk(KERN_WARNING "cdev_alloc failed\n");
1465 goto out;
1466 }
1467 cdev->owner = THIS_MODULE;
1468 cdev->ops = &sg_fops;
1469
7c07d613
JB		 1470 sdp = sg_alloc(disk, scsidp);
1471 if (IS_ERR(sdp)) {
1da177e4 1472 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1473 error = PTR_ERR(sdp);
1da177e4
LT		 1474 goto out;
1475 }
1da177e4 1476
7c07d613 1477 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1478 if (error)
454e8957 1479 goto cdev_add_err;
5e3c34c1 1480
1da177e4
LT		 1481 sdp->cdev = cdev;
1482 if (sg_sysfs_valid) {
ee959b00 1483 struct device *sg_class_member;
1da177e4 1484
d73a1a67
GKH		 1485 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1486 MKDEV(SCSI_GENERIC_MAJOR,
1487 sdp->index),
1488 sdp, "%s", disk->disk_name);
d07e0361
FT		 1489 if (IS_ERR(sg_class_member)) {
1490 printk(KERN_ERR "sg_add: "
ee959b00 1491 "device_create failed\n");
d07e0361
FT		 1492 error = PTR_ERR(sg_class_member);
1493 goto cdev_add_err;
1494 }
d07e0361 1495 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1496 &sg_class_member->kobj, "generic");
1497 if (error)
1498 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1499 "'generic' back to sg%d\n", sdp->index);
1da177e4 1500 } else
7c07d613 1501 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1502
9ccfc756 1503 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1504 "Attached scsi generic sg%d type %d\n", sdp->index,
1505 scsidp->type);
1da177e4 1506
ee959b00 1507 dev_set_drvdata(cl_dev, sdp);
a24484f2 1508
1da177e4
LT		 1509 return 0;
1510
454e8957 1511cdev_add_err:
7c07d613
JB		 1512 write_lock_irqsave(&sg_index_lock, iflags);
1513 idr_remove(&sg_index_idr, sdp->index);
1514 write_unlock_irqrestore(&sg_index_lock, iflags);
1515 kfree(sdp);
454e8957 1516
1da177e4
LT		 1517out:
1518 put_disk(disk);
1519 if (cdev)
1520 cdev_del(cdev);
1521 return error;
1522}
1523
c6517b79
TB		 1524static void sg_device_destroy(struct kref *kref)
1525{
1526 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1527 unsigned long flags;
1528
1529 /* CAUTION! Note that the device can still be found via idr_find()
1530 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1531 * any other cleanup.
1532 */
1533
1534 write_lock_irqsave(&sg_index_lock, flags);
1535 idr_remove(&sg_index_idr, sdp->index);
1536 write_unlock_irqrestore(&sg_index_lock, flags);
1537
1538 SCSI_LOG_TIMEOUT(3,
1539 printk("sg_device_destroy: %s\n",
1540 sdp->disk->disk_name));
1541
1542 put_disk(sdp->disk);
1543 kfree(sdp);
1544}
1545
1546static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1547{
ee959b00
TJ		 1548 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1549 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1550 unsigned long iflags;
1551 Sg_fd *sfp;
1da177e4 1552
c6517b79 1553 if (!sdp || sdp->detached)
1da177e4 1554 return;
7c07d613 1555
c6517b79
TB		 1556 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1557
1558 /* Need a write lock to set sdp->detached. */
7c07d613 1559 write_lock_irqsave(&sg_index_lock, iflags);
c6517b79 1560 sdp->detached = 1;
3442f802 1561 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
c6517b79
TB		 1562 wake_up_interruptible(&sfp->read_wait);
1563 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
7c07d613
JB		 1564 }
1565 write_unlock_irqrestore(&sg_index_lock, iflags);
1566
1567 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1568 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1569 cdev_del(sdp->cdev);
1570 sdp->cdev = NULL;
1da177e4 1571
c6517b79 1572 sg_put_dev(sdp);
1da177e4
LT		 1573}
1574
6460e75a
DG		 1575module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1576module_param_named(def_reserved_size, def_reserved_size, int,
1577 S_IRUGO | S_IWUSR);
1da177e4
LT		 1578module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1579
1580MODULE_AUTHOR("Douglas Gilbert");
1581MODULE_DESCRIPTION("SCSI generic (sg) driver");
1582MODULE_LICENSE("GPL");
1583MODULE_VERSION(SG_VERSION_STR);
f018fa55 1584MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1585
6460e75a
DG		 1586MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1587 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1588MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1589MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1590
1591static int __init
1592init_sg(void)
1593{
1594 int rc;
1595
6460e75a
DG		 1596 if (scatter_elem_sz < PAGE_SIZE) {
1597 scatter_elem_sz = PAGE_SIZE;
1598 scatter_elem_sz_prev = scatter_elem_sz;
1599 }
1da177e4
LT		 1600 if (def_reserved_size >= 0)
1601 sg_big_buff = def_reserved_size;
6460e75a
DG		 1602 else
1603 def_reserved_size = sg_big_buff;
1da177e4
LT		 1604
1605 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1606 SG_MAX_DEVS, "sg");
1607 if (rc)
1608 return rc;
d253878b 1609 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1610 if ( IS_ERR(sg_sysfs_class) ) {
1611 rc = PTR_ERR(sg_sysfs_class);
1612 goto err_out;
1613 }
1614 sg_sysfs_valid = 1;
1615 rc = scsi_register_interface(&sg_interface);
1616 if (0 == rc) {
1617#ifdef CONFIG_SCSI_PROC_FS
1618 sg_proc_init();
1619#endif /* CONFIG_SCSI_PROC_FS */
1620 return 0;
1621 }
d253878b 1622 class_destroy(sg_sysfs_class);
1da177e4
LT		 1623err_out:
1624 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1625 return rc;
1626}
1627
1628static void __exit
1629exit_sg(void)
1630{
1631#ifdef CONFIG_SCSI_PROC_FS
1632 sg_proc_cleanup();
1633#endif /* CONFIG_SCSI_PROC_FS */
1634 scsi_unregister_interface(&sg_interface);
d253878b 1635 class_destroy(sg_sysfs_class);
1da177e4
LT		 1636 sg_sysfs_valid = 0;
1637 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1638 SG_MAX_DEVS);
7c07d613 1639 idr_destroy(&sg_index_idr);
1da177e4
LT		 1640}
1641
44c7b0ea 1642static int sg_start_req(Sg_request *srp, unsigned char *cmd)
10865dfa 1643{
626710c9 1644 int res;
10865dfa 1645 struct request *rq;
44c7b0ea
FT		 1646 Sg_fd *sfp = srp->parentfp;
1647 sg_io_hdr_t *hp = &srp->header;
1648 int dxfer_len = (int) hp->dxfer_len;
1649 int dxfer_dir = hp->dxfer_direction;
626710c9 1650 unsigned int iov_count = hp->iovec_count;
44c7b0ea
FT		 1651 Sg_scatter_hold *req_schp = &srp->data;
1652 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1653 struct request_queue *q = sfp->parentdp->device->request_queue;
626710c9 1654 struct rq_map_data *md, map_data;
10865dfa
FT		 1655 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1656
44c7b0ea
FT		 1657 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1658 dxfer_len));
1659
10865dfa
FT		 1660 rq = blk_get_request(q, rw, GFP_ATOMIC);
1661 if (!rq)
1662 return -ENOMEM;
1663
1664 memcpy(rq->cmd, cmd, hp->cmd_len);
1665
1666 rq->cmd_len = hp->cmd_len;
1667 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1668
1669 srp->rq = rq;
1670 rq->end_io_data = srp;
1671 rq->sense = srp->sense_b;
1672 rq->retries = SG_DEFAULT_RETRIES;
1673
1da177e4 1674 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1675 return 0;
10865dfa 1676
626710c9
FT		 1677 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1678 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1679 !sfp->parentdp->device->host->unchecked_isa_dma &&
2610a254 1680 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
626710c9
FT		 1681 md = NULL;
1682 else
1683 md = &map_data;
1684
1685 if (md) {
1686 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1687 sg_link_reserve(sfp, srp, dxfer_len);
1688 else {
1689 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1690 if (res)
1691 return res;
1692 }
7e56cb0f 1693
626710c9
FT		 1694 md->pages = req_schp->pages;
1695 md->page_order = req_schp->page_order;
1696 md->nr_entries = req_schp->k_use_sg;
56c451f4 1697 md->offset = 0;
97ae77a1 1698 md->null_mapped = hp->dxferp ? 0 : 1;
ecb554a8
FT		 1699 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1700 md->from_user = 1;
1701 else
1702 md->from_user = 0;
626710c9
FT		 1703 }
1704
0fdf96b6
FT		 1705 if (iov_count) {
1706 int len, size = sizeof(struct sg_iovec) * iov_count;
1707 struct iovec *iov;
1708
3094141c
JL		 1709 iov = memdup_user(hp->dxferp, size);
1710 if (IS_ERR(iov))
1711 return PTR_ERR(iov);
0fdf96b6
FT		 1712
1713 len = iov_length(iov, iov_count);
1714 if (hp->dxfer_len < len) {
1715 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1716 len = hp->dxfer_len;
1717 }
1718
1719 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1720 iov_count,
1721 len, GFP_ATOMIC);
1722 kfree(iov);
1723 } else
626710c9
FT		 1724 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1725 hp->dxfer_len, GFP_ATOMIC);
10db10d1
FT		 1726
1727 if (!res) {
626710c9 1728 srp->bio = rq->bio;
10db10d1 1729
626710c9
FT		 1730 if (!md) {
1731 req_schp->dio_in_use = 1;
1732 hp->info |= SG_INFO_DIRECT_IO;
1733 }
1734 }
10db10d1 1735 return res;
1da177e4
LT		 1736}
1737
e7ee4cc0 1738static int sg_finish_rem_req(Sg_request * srp)
1da177e4 1739{
e7ee4cc0
FT		 1740 int ret = 0;
1741
1da177e4
LT		 1742 Sg_fd *sfp = srp->parentfp;
1743 Sg_scatter_hold *req_schp = &srp->data;
1744
1745 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
6e5a30cb
FT		 1746 if (srp->rq) {
1747 if (srp->bio)
e7ee4cc0 1748 ret = blk_rq_unmap_user(srp->bio);
10db10d1 1749
10865dfa 1750 blk_put_request(srp->rq);
6e5a30cb 1751 }
10865dfa 1752
e27168f8
CS		 1753 if (srp->res_used)
1754 sg_unlink_reserve(sfp, srp);
1755 else
1756 sg_remove_scat(req_schp);
1757
1da177e4 1758 sg_remove_request(sfp, srp);
e7ee4cc0
FT		 1759
1760 return ret;
1da177e4
LT		 1761}
1762
1763static int
1764sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1765{
10db10d1 1766 int sg_bufflen = tablesize * sizeof(struct page *);
2d20eaf9 1767 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1768
10db10d1
FT		 1769 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1770 if (!schp->pages)
1da177e4 1771 return -ENOMEM;
1da177e4 1772 schp->sglist_len = sg_bufflen;
d6b10348 1773 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1774}
1775
1da177e4
LT		 1776static int
1777sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1778{
10db10d1 1779 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1780 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1781 int blk_size = buff_size, order;
1782 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4 1783
fb119935 1784 if (blk_size < 0)
1da177e4
LT		 1785 return -EFAULT;
1786 if (0 == blk_size)
1787 ++blk_size; /* don't know why */
b2ed6c69
FT		 1788 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1789 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1da177e4
LT		 1790 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1791 buff_size, blk_size));
d6b10348
MC		 1792
1793 /* N.B. ret_sz carried into this block ... */
1794 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1795 if (mx_sc_elems < 0)
1796 return mx_sc_elems; /* most likely -ENOMEM */
1797
6460e75a
DG		 1798 num = scatter_elem_sz;
1799 if (unlikely(num != scatter_elem_sz_prev)) {
1800 if (num < PAGE_SIZE) {
1801 scatter_elem_sz = PAGE_SIZE;
1802 scatter_elem_sz_prev = PAGE_SIZE;
1803 } else
1804 scatter_elem_sz_prev = num;
1805 }
10db10d1
FT		 1806
1807 if (sfp->low_dma)
1808 gfp_mask |= GFP_DMA;
1809
1810 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1811 gfp_mask |= __GFP_ZERO;
1812
1813 order = get_order(num);
1814retry:
1815 ret_sz = 1 << (PAGE_SHIFT + order);
1816
1817 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1818 k++, rem_sz -= ret_sz) {
1819
6460e75a 1820 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1821 scatter_elem_sz_prev : rem_sz;
1822
1823 schp->pages[k] = alloc_pages(gfp_mask, order);
1824 if (!schp->pages[k])
1825 goto out;
d6b10348 1826
6460e75a
DG		 1827 if (num == scatter_elem_sz_prev) {
1828 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1829 scatter_elem_sz = ret_sz;
1830 scatter_elem_sz_prev = ret_sz;
1831 }
1832 }
d6b10348 1833
7ca63cb4
DG		 1834 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1835 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1836 } /* end of for loop */
1837
10db10d1 1838 schp->page_order = order;
d6b10348 1839 schp->k_use_sg = k;
7ca63cb4
DG		 1840 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1841 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1842
1843 schp->bufflen = blk_size;
1844 if (rem_sz > 0) /* must have failed */
1845 return -ENOMEM;
1da177e4 1846 return 0;
10db10d1
FT		 1847out:
1848 for (i = 0; i < k; i++)
e71044ee 1849 __free_pages(schp->pages[i], order);
10db10d1
FT		 1850
1851 if (--order >= 0)
1852 goto retry;
1853
1854 return -ENOMEM;
1da177e4
LT		 1855}
1856
1da177e4
LT		 1857static void
1858sg_remove_scat(Sg_scatter_hold * schp)
1859{
1860 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1861 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1862 if (!schp->dio_in_use) {
1da177e4
LT		 1863 int k;
1864
10db10d1 1865 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1da177e4 1866 SCSI_LOG_TIMEOUT(5, printk(
10db10d1
FT		 1867 "sg_remove_scat: k=%d, pg=0x%p\n",
1868 k, schp->pages[k]));
1869 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1870 }
6e5a30cb 1871
10db10d1 1872 kfree(schp->pages);
1da177e4 1873 }
d6b10348 1874 }
1da177e4
LT		 1875 memset(schp, 0, sizeof (*schp));
1876}
1877
1da177e4
LT		 1878static int
1879sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1880{
1881 Sg_scatter_hold *schp = &srp->data;
d6b10348 1882 int k, num;
1da177e4
LT		 1883
1884 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1885 num_read_xfer));
1886 if ((!outp) || (num_read_xfer <= 0))
1887 return 0;
d6b10348 1888
10db10d1
FT		 1889 num = 1 << (PAGE_SHIFT + schp->page_order);
1890 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1891 if (num > num_read_xfer) {
10db10d1 1892 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1893 num_read_xfer))
1894 return -EFAULT;
1895 break;
1896 } else {
10db10d1 1897 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1898 num))
1899 return -EFAULT;
1900 num_read_xfer -= num;
1901 if (num_read_xfer <= 0)
1da177e4 1902 break;
d6b10348 1903 outp += num;
1da177e4 1904 }
1da177e4 1905 }
d6b10348 1906
1da177e4
LT		 1907 return 0;
1908}
1909
1910static void
1911sg_build_reserve(Sg_fd * sfp, int req_size)
1912{
1913 Sg_scatter_hold *schp = &sfp->reserve;
1914
1915 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1916 do {
1917 if (req_size < PAGE_SIZE)
1918 req_size = PAGE_SIZE;
1919 if (0 == sg_build_indirect(schp, sfp, req_size))
1920 return;
1921 else
1922 sg_remove_scat(schp);
1923 req_size >>= 1; /* divide by 2 */
1924 } while (req_size > (PAGE_SIZE / 2));
1925}
1926
1927static void
1928sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1929{
1930 Sg_scatter_hold *req_schp = &srp->data;
1931 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 1932 int k, num, rem;
1da177e4
LT		 1933
1934 srp->res_used = 1;
1935 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 1936 rem = size;
d6b10348 1937
10db10d1
FT		 1938 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1939 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 1940 if (rem <= num) {
d6b10348
MC		 1941 req_schp->k_use_sg = k + 1;
1942 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 1943 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 1944
1945 req_schp->bufflen = size;
10db10d1 1946 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 1947 break;
1948 } else
1949 rem -= num;
1da177e4 1950 }
d6b10348
MC		 1951
1952 if (k >= rsv_schp->k_use_sg)
1953 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 1954}
1955
1956static void
1957sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1958{
1959 Sg_scatter_hold *req_schp = &srp->data;
1da177e4
LT		 1960
1961 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1962 (int) req_schp->k_use_sg));
1da177e4
LT		 1963 req_schp->k_use_sg = 0;
1964 req_schp->bufflen = 0;
10db10d1
FT		 1965 req_schp->pages = NULL;
1966 req_schp->page_order = 0;
1da177e4
LT		 1967 req_schp->sglist_len = 0;
1968 sfp->save_scat_len = 0;
1969 srp->res_used = 0;
1970}
1971
1972static Sg_request *
1973sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1974{
1975 Sg_request *resp;
1976 unsigned long iflags;
1977
1978 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1979 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1980 /* look for requests that are ready + not SG_IO owned */
1981 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1982 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1983 resp->done = 2; /* guard against other readers */
1984 break;
1985 }
1986 }
1987 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1988 return resp;
1989}
1990
1da177e4
LT		 1991/* always adds to end of list */
1992static Sg_request *
1993sg_add_request(Sg_fd * sfp)
1994{
1995 int k;
1996 unsigned long iflags;
1997 Sg_request *resp;
1998 Sg_request *rp = sfp->req_arr;
1999
2000 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2001 resp = sfp->headrp;
2002 if (!resp) {
2003 memset(rp, 0, sizeof (Sg_request));
2004 rp->parentfp = sfp;
2005 resp = rp;
2006 sfp->headrp = resp;
2007 } else {
2008 if (0 == sfp->cmd_q)
2009 resp = NULL; /* command queuing disallowed */
2010 else {
2011 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2012 if (!rp->parentfp)
2013 break;
2014 }
2015 if (k < SG_MAX_QUEUE) {
2016 memset(rp, 0, sizeof (Sg_request));
2017 rp->parentfp = sfp;
2018 while (resp->nextrp)
2019 resp = resp->nextrp;
2020 resp->nextrp = rp;
2021 resp = rp;
2022 } else
2023 resp = NULL;
2024 }
2025 }
2026 if (resp) {
2027 resp->nextrp = NULL;
cb59e840 2028 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2029 }
2030 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2031 return resp;
2032}
2033
2034/* Return of 1 for found; 0 for not found */
2035static int
2036sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2037{
2038 Sg_request *prev_rp;
2039 Sg_request *rp;
2040 unsigned long iflags;
2041 int res = 0;
2042
2043 if ((!sfp) || (!srp) || (!sfp->headrp))
2044 return res;
2045 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2046 prev_rp = sfp->headrp;
2047 if (srp == prev_rp) {
2048 sfp->headrp = prev_rp->nextrp;
2049 prev_rp->parentfp = NULL;
2050 res = 1;
2051 } else {
2052 while ((rp = prev_rp->nextrp)) {
2053 if (srp == rp) {
2054 prev_rp->nextrp = rp->nextrp;
2055 rp->parentfp = NULL;
2056 res = 1;
2057 break;
2058 }
2059 prev_rp = rp;
2060 }
2061 }
2062 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2063 return res;
2064}
2065
1da177e4
LT		 2066static Sg_fd *
2067sg_add_sfp(Sg_device * sdp, int dev)
2068{
2069 Sg_fd *sfp;
2070 unsigned long iflags;
44ec9542 2071 int bufflen;
1da177e4 2072
d6b10348 2073 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4
LT		 2074 if (!sfp)
2075 return NULL;
d6b10348 2076
1da177e4
LT		 2077 init_waitqueue_head(&sfp->read_wait);
2078 rwlock_init(&sfp->rq_list_lock);
2079
c6517b79 2080 kref_init(&sfp->f_ref);
1da177e4
LT		 2081 sfp->timeout = SG_DEFAULT_TIMEOUT;
2082 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2083 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2084 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2085 sdp->device->host->unchecked_isa_dma : 1;
2086 sfp->cmd_q = SG_DEF_COMMAND_Q;
2087 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2088 sfp->parentdp = sdp;
7c07d613 2089 write_lock_irqsave(&sg_index_lock, iflags);
3442f802 2090 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
7c07d613 2091 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2092 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2093 if (unlikely(sg_big_buff != def_reserved_size))
2094 sg_big_buff = def_reserved_size;
2095
44ec9542 2096 bufflen = min_t(int, sg_big_buff,
ae03bf63 2097 queue_max_sectors(sdp->device->request_queue) * 512);
44ec9542 2098 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2099 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2100 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
c6517b79
TB		 2101
2102 kref_get(&sdp->d_ref);
2103 __module_get(THIS_MODULE);
1da177e4
LT		 2104 return sfp;
2105}
2106
c6517b79 2107static void sg_remove_sfp_usercontext(struct work_struct *work)
1da177e4 2108{
c6517b79
TB		 2109 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2110 struct sg_device *sdp = sfp->parentdp;
2111
2112 /* Cleanup any responses which were never read(). */
2113 while (sfp->headrp)
2114 sg_finish_rem_req(sfp->headrp);
1da177e4 2115
1da177e4 2116 if (sfp->reserve.bufflen > 0) {
c6517b79
TB		 2117 SCSI_LOG_TIMEOUT(6,
2118 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2119 (int) sfp->reserve.bufflen,
2120 (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2121 sg_remove_scat(&sfp->reserve);
2122 }
c6517b79
TB		 2123
2124 SCSI_LOG_TIMEOUT(6,
2125 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2126 sdp->disk->disk_name,
2127 sfp));
d6b10348 2128 kfree(sfp);
c6517b79
TB		 2129
2130 scsi_device_put(sdp->device);
2131 sg_put_dev(sdp);
2132 module_put(THIS_MODULE);
1da177e4
LT		 2133}
2134
c6517b79 2135static void sg_remove_sfp(struct kref *kref)
1da177e4 2136{
c6517b79
TB		 2137 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2138 struct sg_device *sdp = sfp->parentdp;
c6517b79 2139 unsigned long iflags;
1da177e4 2140
c6517b79 2141 write_lock_irqsave(&sg_index_lock, iflags);
3442f802 2142 list_del(&sfp->sfd_siblings);
c6517b79
TB		 2143 write_unlock_irqrestore(&sg_index_lock, iflags);
2144 wake_up_interruptible(&sdp->o_excl_wait);
1da177e4 2145
015640ed
FT		 2146 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2147 schedule_work(&sfp->ew.work);
1da177e4
LT		 2148}
2149
2150static int
2151sg_res_in_use(Sg_fd * sfp)
2152{
2153 const Sg_request *srp;
2154 unsigned long iflags;
2155
2156 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2157 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2158 if (srp->res_used)
2159 break;
2160 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2161 return srp ? 1 : 0;
2162}
2163
1da177e4 2164#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2165static int
2166sg_idr_max_id(int id, void *p, void *data)
2167{
2168 int *k = data;
2169
2170 if (*k < id)
2171 *k = id;
2172
2173 return 0;
2174}
2175
1da177e4
LT		 2176static int
2177sg_last_dev(void)
2178{
53474c04 2179 int k = -1;
1da177e4
LT		 2180 unsigned long iflags;
2181
7c07d613
JB		 2182 read_lock_irqsave(&sg_index_lock, iflags);
2183 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2184 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2185 return k + 1; /* origin 1 */
2186}
2187#endif
2188
c6517b79
TB		 2189/* must be called with sg_index_lock held */
2190static Sg_device *sg_lookup_dev(int dev)
1da177e4 2191{
c6517b79
TB		 2192 return idr_find(&sg_index_idr, dev);
2193}
1da177e4 2194
c6517b79
TB		 2195static Sg_device *sg_get_dev(int dev)
2196{
2197 struct sg_device *sdp;
2198 unsigned long flags;
2199
2200 read_lock_irqsave(&sg_index_lock, flags);
2201 sdp = sg_lookup_dev(dev);
2202 if (!sdp)
2203 sdp = ERR_PTR(-ENXIO);
2204 else if (sdp->detached) {
2205 /* If sdp->detached, then the refcount may already be 0, in
2206 * which case it would be a bug to do kref_get().
2207 */
2208 sdp = ERR_PTR(-ENODEV);
2209 } else
2210 kref_get(&sdp->d_ref);
2211 read_unlock_irqrestore(&sg_index_lock, flags);
7c07d613 2212
1da177e4
LT		 2213 return sdp;
2214}
2215
c6517b79
TB		 2216static void sg_put_dev(struct sg_device *sdp)
2217{
2218 kref_put(&sdp->d_ref, sg_device_destroy);
2219}
2220
1da177e4
LT		 2221#ifdef CONFIG_SCSI_PROC_FS
2222
2223static struct proc_dir_entry *sg_proc_sgp = NULL;
2224
2225static char sg_proc_sg_dirname[] = "scsi/sg";
2226
2227static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2228
2229static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2230static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2231 size_t count, loff_t *off);
828c0950
AD		 2232static const struct file_operations adio_fops = {
2233 .owner = THIS_MODULE,
1da177e4 2234 .open = sg_proc_single_open_adio,
828c0950
AD		 2235 .read = seq_read,
2236 .llseek = seq_lseek,
1da177e4
LT		 2237 .write = sg_proc_write_adio,
2238 .release = single_release,
2239};
2240
2241static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2242static ssize_t sg_proc_write_dressz(struct file *filp,
2243 const char __user *buffer, size_t count, loff_t *off);
828c0950
AD		 2244static const struct file_operations dressz_fops = {
2245 .owner = THIS_MODULE,
1da177e4 2246 .open = sg_proc_single_open_dressz,
828c0950
AD		 2247 .read = seq_read,
2248 .llseek = seq_lseek,
1da177e4
LT		 2249 .write = sg_proc_write_dressz,
2250 .release = single_release,
2251};
2252
2253static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2254static int sg_proc_single_open_version(struct inode *inode, struct file *file);
828c0950
AD		 2255static const struct file_operations version_fops = {
2256 .owner = THIS_MODULE,
1da177e4 2257 .open = sg_proc_single_open_version,
828c0950
AD		 2258 .read = seq_read,
2259 .llseek = seq_lseek,
1da177e4
LT		 2260 .release = single_release,
2261};
2262
2263static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2264static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
828c0950
AD		 2265static const struct file_operations devhdr_fops = {
2266 .owner = THIS_MODULE,
1da177e4 2267 .open = sg_proc_single_open_devhdr,
828c0950
AD		 2268 .read = seq_read,
2269 .llseek = seq_lseek,
1da177e4
LT		 2270 .release = single_release,
2271};
2272
2273static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2274static int sg_proc_open_dev(struct inode *inode, struct file *file);
2275static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2276static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2277static void dev_seq_stop(struct seq_file *s, void *v);
828c0950
AD		 2278static const struct file_operations dev_fops = {
2279 .owner = THIS_MODULE,
1da177e4 2280 .open = sg_proc_open_dev,
828c0950
AD		 2281 .read = seq_read,
2282 .llseek = seq_lseek,
1da177e4
LT		 2283 .release = seq_release,
2284};
88e9d34c 2285static const struct seq_operations dev_seq_ops = {
1da177e4
LT		 2286 .start = dev_seq_start,
2287 .next = dev_seq_next,
2288 .stop = dev_seq_stop,
2289 .show = sg_proc_seq_show_dev,
2290};
2291
2292static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2293static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
828c0950
AD		 2294static const struct file_operations devstrs_fops = {
2295 .owner = THIS_MODULE,
1da177e4 2296 .open = sg_proc_open_devstrs,
828c0950
AD		 2297 .read = seq_read,
2298 .llseek = seq_lseek,
1da177e4
LT		 2299 .release = seq_release,
2300};
88e9d34c 2301static const struct seq_operations devstrs_seq_ops = {
1da177e4
LT		 2302 .start = dev_seq_start,
2303 .next = dev_seq_next,
2304 .stop = dev_seq_stop,
2305 .show = sg_proc_seq_show_devstrs,
2306};
2307
2308static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2309static int sg_proc_open_debug(struct inode *inode, struct file *file);
828c0950
AD		 2310static const struct file_operations debug_fops = {
2311 .owner = THIS_MODULE,
1da177e4 2312 .open = sg_proc_open_debug,
828c0950
AD		 2313 .read = seq_read,
2314 .llseek = seq_lseek,
1da177e4
LT		 2315 .release = seq_release,
2316};
88e9d34c 2317static const struct seq_operations debug_seq_ops = {
1da177e4
LT		 2318 .start = dev_seq_start,
2319 .next = dev_seq_next,
2320 .stop = dev_seq_stop,
2321 .show = sg_proc_seq_show_debug,
2322};
2323
2324
2325struct sg_proc_leaf {
2326 const char * name;
828c0950 2327 const struct file_operations * fops;
1da177e4
LT		 2328};
2329
18b8ba6c 2330static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
1da177e4
LT		 2331 {"allow_dio", &adio_fops},
2332 {"debug", &debug_fops},
2333 {"def_reserved_size", &dressz_fops},
2334 {"device_hdr", &devhdr_fops},
2335 {"devices", &dev_fops},
2336 {"device_strs", &devstrs_fops},
2337 {"version", &version_fops}
2338};
2339
2340static int
2341sg_proc_init(void)
2342{
6391a113 2343 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
d161a13f 2344 int k;
1da177e4 2345
66600221 2346 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2347 if (!sg_proc_sgp)
2348 return 1;
2349 for (k = 0; k < num_leaves; ++k) {
18b8ba6c 2350 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
d161a13f 2351 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f 2352 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2353 }
2354 return 0;
2355}
2356
2357static void
2358sg_proc_cleanup(void)
2359{
2360 int k;
6391a113 2361 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2362
2363 if (!sg_proc_sgp)
2364 return;
2365 for (k = 0; k < num_leaves; ++k)
2366 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2367 remove_proc_entry(sg_proc_sg_dirname, NULL);
2368}
2369
2370
2371static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2372{
2373 seq_printf(s, "%d\n", *((int *)s->private));
2374 return 0;
2375}
2376
2377static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2378{
2379 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2380}
2381
2382static ssize_t
2383sg_proc_write_adio(struct file *filp, const char __user *buffer,
2384 size_t count, loff_t *off)
2385{
7e95fffe
SB		 2386 int err;
2387 unsigned long num;
1da177e4
LT		 2388
2389 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2390 return -EACCES;
7e95fffe
SB		 2391 err = kstrtoul_from_user(buffer, count, 0, &num);
2392 if (err)
2393 return err;
2394 sg_allow_dio = num ? 1 : 0;
1da177e4
LT		 2395 return count;
2396}
2397
2398static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2399{
2400 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2401}
2402
2403static ssize_t
2404sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2405 size_t count, loff_t *off)
2406{
7e95fffe 2407 int err;
1da177e4 2408 unsigned long k = ULONG_MAX;
1da177e4
LT		 2409
2410 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2411 return -EACCES;
7e95fffe
SB		 2412
2413 err = kstrtoul_from_user(buffer, count, 0, &k);
2414 if (err)
2415 return err;
1da177e4
LT		 2416 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2417 sg_big_buff = k;
2418 return count;
2419 }
2420 return -ERANGE;
2421}
2422
2423static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2424{
2425 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2426 sg_version_date);
2427 return 0;
2428}
2429
2430static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2431{
2432 return single_open(file, sg_proc_seq_show_version, NULL);
2433}
2434
2435static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2436{
2437 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2438 "online\n");
2439 return 0;
2440}
2441
2442static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2443{
2444 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2445}
2446
2447struct sg_proc_deviter {
2448 loff_t index;
2449 size_t max;
2450};
2451
2452static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2453{
2454 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2455
729d70f5 2456 s->private = it;
1da177e4
LT		 2457 if (! it)
2458 return NULL;
729d70f5 2459
1da177e4
LT		 2460 it->index = *pos;
2461 it->max = sg_last_dev();
2462 if (it->index >= it->max)
729d70f5 2463 return NULL;
1da177e4 2464 return it;
1da177e4
LT		 2465}
2466
2467static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2468{
729d70f5 2469 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2470
2471 *pos = ++it->index;
2472 return (it->index < it->max) ? it : NULL;
2473}
2474
2475static void dev_seq_stop(struct seq_file *s, void *v)
2476{
729d70f5 2477 kfree(s->private);
1da177e4
LT		 2478}
2479
2480static int sg_proc_open_dev(struct inode *inode, struct file *file)
2481{
2482 return seq_open(file, &dev_seq_ops);
2483}
2484
2485static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2486{
2487 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2488 Sg_device *sdp;
2489 struct scsi_device *scsidp;
c6517b79 2490 unsigned long iflags;
1da177e4 2491
c6517b79
TB		 2492 read_lock_irqsave(&sg_index_lock, iflags);
2493 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2494 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2495 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2496 scsidp->host->host_no, scsidp->channel,
2497 scsidp->id, scsidp->lun, (int) scsidp->type,
2498 1,
2499 (int) scsidp->queue_depth,
2500 (int) scsidp->device_busy,
2501 (int) scsi_device_online(scsidp));
2502 else
2503 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
c6517b79 2504 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2505 return 0;
2506}
2507
2508static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2509{
2510 return seq_open(file, &devstrs_seq_ops);
2511}
2512
2513static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2514{
2515 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2516 Sg_device *sdp;
2517 struct scsi_device *scsidp;
c6517b79 2518 unsigned long iflags;
1da177e4 2519
c6517b79
TB		 2520 read_lock_irqsave(&sg_index_lock, iflags);
2521 sdp = it ? sg_lookup_dev(it->index) : NULL;
1da177e4
LT		 2522 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2523 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2524 scsidp->vendor, scsidp->model, scsidp->rev);
2525 else
2526 seq_printf(s, "<no active device>\n");
c6517b79 2527 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2528 return 0;
2529}
2530
c6517b79 2531/* must be called while holding sg_index_lock */
1da177e4
LT		 2532static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2533{
2534 int k, m, new_interface, blen, usg;
2535 Sg_request *srp;
2536 Sg_fd *fp;
2537 const sg_io_hdr_t *hp;
2538 const char * cp;
cb59e840 2539 unsigned int ms;
1da177e4 2540
3442f802
FT		 2541 k = 0;
2542 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2543 k++;
c6517b79 2544 read_lock(&fp->rq_list_lock); /* irqs already disabled */
1da177e4 2545 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3442f802 2546 "(res)sgat=%d low_dma=%d\n", k,
1da177e4
LT		 2547 jiffies_to_msecs(fp->timeout),
2548 fp->reserve.bufflen,
2549 (int) fp->reserve.k_use_sg,
2550 (int) fp->low_dma);
ebaf466b 2551 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
1da177e4 2552 (int) fp->cmd_q, (int) fp->force_packid,
ebaf466b 2553 (int) fp->keep_orphan);
c6517b79
TB		 2554 for (m = 0, srp = fp->headrp;
2555 srp != NULL;
2556 ++m, srp = srp->nextrp) {
1da177e4
LT		 2557 hp = &srp->header;
2558 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2559 if (srp->res_used) {
2560 if (new_interface &&
2561 (SG_FLAG_MMAP_IO & hp->flags))
2562 cp = " mmap>> ";
2563 else
2564 cp = " rb>> ";
2565 } else {
2566 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2567 cp = " dio>> ";
2568 else
2569 cp = " ";
2570 }
2571 seq_printf(s, cp);
d6b10348
MC		 2572 blen = srp->data.bufflen;
2573 usg = srp->data.k_use_sg;
1da177e4
LT		 2574 seq_printf(s, srp->done ?
2575 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2576 : "act:");
1da177e4
LT		 2577 seq_printf(s, " id=%d blen=%d",
2578 srp->header.pack_id, blen);
2579 if (srp->done)
2580 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 2581 else {
2582 ms = jiffies_to_msecs(jiffies);
1da177e4 2583 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 2584 (new_interface ? hp->timeout :
2585 jiffies_to_msecs(fp->timeout)),
2586 (ms > hp->duration ? ms - hp->duration : 0));
2587 }
1da177e4
LT		 2588 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2589 (int) srp->data.cmd_opcode);
2590 }
2591 if (0 == m)
2592 seq_printf(s, " No requests active\n");
c6517b79 2593 read_unlock(&fp->rq_list_lock);
1da177e4
LT		 2594 }
2595}
2596
2597static int sg_proc_open_debug(struct inode *inode, struct file *file)
2598{
2599 return seq_open(file, &debug_seq_ops);
2600}
2601
2602static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2603{
2604 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2605 Sg_device *sdp;
c6517b79 2606 unsigned long iflags;
1da177e4
LT		 2607
2608 if (it && (0 == it->index)) {
7c07d613
JB		 2609 seq_printf(s, "max_active_device=%d(origin 1)\n",
2610 (int)it->max);
1da177e4
LT		 2611 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2612 }
1da177e4 2613
c6517b79
TB		 2614 read_lock_irqsave(&sg_index_lock, iflags);
2615 sdp = it ? sg_lookup_dev(it->index) : NULL;
3442f802 2616 if (sdp && !list_empty(&sdp->sfds)) {
c6517b79 2617 struct scsi_device *scsidp = sdp->device;
1da177e4 2618
c6517b79
TB		 2619 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2620 if (sdp->detached)
2621 seq_printf(s, "detached pending close ");
2622 else
2623 seq_printf
2624 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2625 scsidp->host->host_no,
2626 scsidp->channel, scsidp->id,
2627 scsidp->lun,
2628 scsidp->host->hostt->emulated);
2629 seq_printf(s, " sg_tablesize=%d excl=%d\n",
b499e524 2630 sdp->sg_tablesize, get_exclude(sdp));
1da177e4
LT		 2631 sg_proc_debug_helper(s, sdp);
2632 }
c6517b79 2633 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2634 return 0;
2635}
2636
2637#endif /* CONFIG_SCSI_PROC_FS */
2638
2639module_init(init_sg);
2640module_exit(exit_sg);
kernel source for telekom puls (alcatel/mediatek)