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scsi: zorro_esp: New driver for Amiga Zorro NCR53C9x boards
[linux-2.6-block.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:
65c26a0f 10 * Copyright (C) 1998 - 2014 Douglas Gilbert
1da177e4
LT		 11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 */
18
65c26a0f
DG		 19static int sg_version_num = 30536; /* 2 digits for each component */
20#define SG_VERSION_STR "3.5.36"
1da177e4
LT		 21
22/*
65c26a0f 23 * D. P. Gilbert (dgilbert@interlog.com), notes:
1da177e4
LT		 24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
26 * (otherwise the macros compile to empty statements).
27 *
28 */
1da177e4
LT		 29#include <linux/module.h>
30
31#include <linux/fs.h>
32#include <linux/kernel.h>
33#include <linux/sched.h>
34#include <linux/string.h>
35#include <linux/mm.h>
36#include <linux/errno.h>
37#include <linux/mtio.h>
38#include <linux/ioctl.h>
5a0e3ad6 39#include <linux/slab.h>
1da177e4
LT		 40#include <linux/fcntl.h>
41#include <linux/init.h>
42#include <linux/poll.h>
1da177e4 43#include <linux/moduleparam.h>
1da177e4 44#include <linux/cdev.h>
7c07d613 45#include <linux/idr.h>
1da177e4
LT		 46#include <linux/seq_file.h>
47#include <linux/blkdev.h>
48#include <linux/delay.h>
6da127ad 49#include <linux/blktrace_api.h>
c45d15d2 50#include <linux/mutex.h>
cc833acb 51#include <linux/atomic.h>
2fe038e3 52#include <linux/ratelimit.h>
e2e40f2c 53#include <linux/uio.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>
65c26a0f 66static char *sg_version_date = "20140603";
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
65c26a0f
DG		 76/* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type
77 * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater
78 * than 16 bytes are "variable length" whose length is a multiple of 4
79 */
80#define SG_MAX_CDB_SIZE 252
81
f8630bd7 82#define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
1da177e4
LT		 83
84int sg_big_buff = SG_DEF_RESERVED_SIZE;
85/* N.B. This variable is readable and writeable via
86 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
87 of this size (or less if there is not enough memory) will be reserved
88 for use by this file descriptor. [Deprecated usage: this variable is also
89 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
90 the kernel (i.e. it is not a module).] */
91static int def_reserved_size = -1; /* picks up init parameter */
92static int sg_allow_dio = SG_ALLOW_DIO_DEF;
93
6460e75a
DG		 94static int scatter_elem_sz = SG_SCATTER_SZ;
95static int scatter_elem_sz_prev = SG_SCATTER_SZ;
96
1da177e4 97#define SG_SECTOR_SZ 512
1da177e4 98
cc833acb
DG		 99static int sg_add_device(struct device *, struct class_interface *);
100static void sg_remove_device(struct device *, struct class_interface *);
98481ff0 101
7c07d613 102static DEFINE_IDR(sg_index_idr);
c0d3b9c2
JB		 103static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
104 file descriptor list for device */
1da177e4
LT		 105
106static struct class_interface sg_interface = {
cc833acb
DG		 107 .add_dev = sg_add_device,
108 .remove_dev = sg_remove_device,
1da177e4
LT		 109};
110
111typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
112 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 113 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4 114 unsigned bufflen; /* Size of (aggregate) data buffer */
10db10d1
FT		 115 struct page **pages;
116 int page_order;
1da177e4
LT		 117 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
118 unsigned char cmd_opcode; /* first byte of command */
119} Sg_scatter_hold;
120
121struct sg_device; /* forward declarations */
122struct sg_fd;
123
124typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
109bade9 125 struct list_head entry; /* list entry */
1da177e4
LT		 126 struct sg_fd *parentfp; /* NULL -> not in use */
127 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
128 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 129 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 130 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
131 char orphan; /* 1 -> drop on sight, 0 -> normal */
132 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
6acddc5e
JE		 133 /* done protected by rq_list_lock */
134 char done; /* 0->before bh, 1->before read, 2->read */
10865dfa 135 struct request *rq;
6e5a30cb 136 struct bio *bio;
c96952ed 137 struct execute_work ew;
1da177e4
LT		 138} Sg_request;
139
140typedef struct sg_fd { /* holds the state of a file descriptor */
cc833acb 141 struct list_head sfd_siblings; /* protected by device's sfd_lock */
1da177e4
LT		 142 struct sg_device *parentdp; /* owning device */
143 wait_queue_head_t read_wait; /* queue read until command done */
144 rwlock_t rq_list_lock; /* protect access to list in req_arr */
1bc0eb04 145 struct mutex f_mutex; /* protect against changes in this fd */
1da177e4
LT		 146 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
147 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
148 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
109bade9 149 struct list_head rq_list; /* head of request list */
1da177e4
LT		 150 struct fasync_struct *async_qp; /* used by asynchronous notification */
151 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
1da177e4 152 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
1da177e4 153 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
65c26a0f 154 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */
1da177e4
LT		 155 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
156 char mmap_called; /* 0 -> mmap() never called on this fd */
1bc0eb04 157 char res_in_use; /* 1 -> 'reserve' array in use */
c6517b79
TB		 158 struct kref f_ref;
159 struct execute_work ew;
1da177e4
LT		 160} Sg_fd;
161
162typedef struct sg_device { /* holds the state of each scsi generic device */
163 struct scsi_device *device;
cc833acb
DG		 164 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */
165 struct mutex open_rel_lock; /* held when in open() or release() */
1da177e4 166 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 167 u32 index; /* device index number */
3442f802 168 struct list_head sfds;
cc833acb
DG		 169 rwlock_t sfd_lock; /* protect access to sfd list */
170 atomic_t detaching; /* 0->device usable, 1->device detaching */
171 bool exclude; /* 1->open(O_EXCL) succeeded and is active */
172 int open_cnt; /* count of opens (perhaps < num(sfds) ) */
1da177e4
LT		 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>] */
c6517b79 176 struct kref d_ref;
1da177e4
LT		 177} Sg_device;
178
d6b10348 179/* tasklet or soft irq callback */
2a842aca 180static void sg_rq_end_io(struct request *rq, blk_status_t status);
10865dfa 181static int sg_start_req(Sg_request *srp, unsigned char *cmd);
e7ee4cc0 182static int sg_finish_rem_req(Sg_request * srp);
1da177e4 183static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
1da177e4
LT		 184static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
185 Sg_request * srp);
0b07de85
AG		 186static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
187 const char __user *buf, size_t count, int blocking,
a2dd3b4c 188 int read_only, int sg_io_owned, Sg_request **o_srp);
1da177e4
LT		 189static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
190 unsigned char *cmnd, int timeout, int blocking);
1da177e4 191static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
95e159d6 192static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp);
1da177e4
LT		 193static void sg_build_reserve(Sg_fd * sfp, int req_size);
194static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
195static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
95e159d6 196static Sg_fd *sg_add_sfp(Sg_device * sdp);
c6517b79 197static void sg_remove_sfp(struct kref *);
1da177e4
LT		 198static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
199static Sg_request *sg_add_request(Sg_fd * sfp);
200static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
1da177e4 201static Sg_device *sg_get_dev(int dev);
cc833acb 202static void sg_device_destroy(struct kref *kref);
1da177e4 203
1da177e4
LT		 204#define SZ_SG_HEADER sizeof(struct sg_header)
205#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
206#define SZ_SG_IOVEC sizeof(sg_iovec_t)
207#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
208
95e159d6 209#define sg_printk(prefix, sdp, fmt, a...) \
22e0d994
HR		 210 sdev_prefix_printk(prefix, (sdp)->device, \
211 (sdp)->disk->disk_name, fmt, ##a)
95e159d6 212
14e507b8
FT		 213static int sg_allow_access(struct file *filp, unsigned char *cmd)
214{
35df8397 215 struct sg_fd *sfp = filp->private_data;
14e507b8
FT		 216
217 if (sfp->parentdp->device->type == TYPE_SCANNER)
218 return 0;
219
f00c4d80 220 return blk_verify_command(cmd, filp->f_mode);
14e507b8
FT		 221}
222
cc833acb
DG		 223static int
224open_wait(Sg_device *sdp, int flags)
98481ff0 225{
cc833acb 226 int retval = 0;
98481ff0 227
cc833acb
DG		 228 if (flags & O_EXCL) {
229 while (sdp->open_cnt > 0) {
230 mutex_unlock(&sdp->open_rel_lock);
231 retval = wait_event_interruptible(sdp->open_wait,
232 (atomic_read(&sdp->detaching) ||
233 !sdp->open_cnt));
234 mutex_lock(&sdp->open_rel_lock);
235
236 if (retval) /* -ERESTARTSYS */
237 return retval;
238 if (atomic_read(&sdp->detaching))
239 return -ENODEV;
240 }
241 } else {
242 while (sdp->exclude) {
243 mutex_unlock(&sdp->open_rel_lock);
244 retval = wait_event_interruptible(sdp->open_wait,
245 (atomic_read(&sdp->detaching) ||
246 !sdp->exclude));
247 mutex_lock(&sdp->open_rel_lock);
248
249 if (retval) /* -ERESTARTSYS */
250 return retval;
251 if (atomic_read(&sdp->detaching))
252 return -ENODEV;
253 }
254 }
035d12e6 255
cc833acb 256 return retval;
035d12e6
JE		 257}
258
cc833acb 259/* Returns 0 on success, else a negated errno value */
1da177e4
LT		 260static int
261sg_open(struct inode *inode, struct file *filp)
262{
263 int dev = iminor(inode);
264 int flags = filp->f_flags;
d6b10348 265 struct request_queue *q;
1da177e4
LT		 266 Sg_device *sdp;
267 Sg_fd *sfp;
1da177e4
LT		 268 int retval;
269
270 nonseekable_open(inode, filp);
cc833acb
DG		 271 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
272 return -EPERM; /* Can't lock it with read only access */
1da177e4 273 sdp = sg_get_dev(dev);
cc833acb
DG		 274 if (IS_ERR(sdp))
275 return PTR_ERR(sdp);
1da177e4 276
95e159d6
HR		 277 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
278 "sg_open: flags=0x%x\n", flags));
279
1da177e4
LT		 280 /* This driver's module count bumped by fops_get in <linux/fs.h> */
281 /* Prevent the device driver from vanishing while we sleep */
282 retval = scsi_device_get(sdp->device);
c6517b79
TB		 283 if (retval)
284 goto sg_put;
1da177e4 285
bc4f2401
AS		 286 retval = scsi_autopm_get_device(sdp->device);
287 if (retval)
288 goto sdp_put;
289
cc833acb
DG		 290 /* scsi_block_when_processing_errors() may block so bypass
291 * check if O_NONBLOCK. Permits SCSI commands to be issued
292 * during error recovery. Tread carefully. */
1da177e4
LT		 293 if (!((flags & O_NONBLOCK) ||
294 scsi_block_when_processing_errors(sdp->device))) {
295 retval = -ENXIO;
296 /* we are in error recovery for this device */
297 goto error_out;
298 }
299
cc833acb
DG		 300 mutex_lock(&sdp->open_rel_lock);
301 if (flags & O_NONBLOCK) {
302 if (flags & O_EXCL) {
303 if (sdp->open_cnt > 0) {
304 retval = -EBUSY;
305 goto error_mutex_locked;
306 }
307 } else {
308 if (sdp->exclude) {
309 retval = -EBUSY;
310 goto error_mutex_locked;
311 }
1da177e4 312 }
cc833acb
DG		 313 } else {
314 retval = open_wait(sdp, flags);
315 if (retval) /* -ERESTARTSYS or -ENODEV */
316 goto error_mutex_locked;
1da177e4 317 }
cc833acb
DG		 318
319 /* N.B. at this point we are holding the open_rel_lock */
320 if (flags & O_EXCL)
321 sdp->exclude = true;
322
323 if (sdp->open_cnt < 1) { /* no existing opens */
1da177e4 324 sdp->sgdebug = 0;
d6b10348 325 q = sdp->device->request_queue;
8a78362c 326 sdp->sg_tablesize = queue_max_segments(q);
1da177e4 327 }
95e159d6 328 sfp = sg_add_sfp(sdp);
cc833acb
DG		 329 if (IS_ERR(sfp)) {
330 retval = PTR_ERR(sfp);
331 goto out_undo;
065b4a2f 332 }
cc833acb
DG		 333
334 filp->private_data = sfp;
335 sdp->open_cnt++;
336 mutex_unlock(&sdp->open_rel_lock);
337
065b4a2f 338 retval = 0;
c6517b79 339sg_put:
cc833acb 340 kref_put(&sdp->d_ref, sg_device_destroy);
1da177e4 341 return retval;
cc833acb
DG		 342
343out_undo:
344 if (flags & O_EXCL) {
345 sdp->exclude = false; /* undo if error */
346 wake_up_interruptible(&sdp->open_wait);
347 }
348error_mutex_locked:
349 mutex_unlock(&sdp->open_rel_lock);
350error_out:
351 scsi_autopm_put_device(sdp->device);
352sdp_put:
353 scsi_device_put(sdp->device);
354 goto sg_put;
1da177e4
LT		 355}
356
cc833acb
DG		 357/* Release resources associated with a successful sg_open()
358 * Returns 0 on success, else a negated errno value */
1da177e4
LT		 359static int
360sg_release(struct inode *inode, struct file *filp)
361{
362 Sg_device *sdp;
363 Sg_fd *sfp;
364
365 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
366 return -ENXIO;
95e159d6 367 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
c6517b79 368
cc833acb 369 mutex_lock(&sdp->open_rel_lock);
bc4f2401 370 scsi_autopm_put_device(sdp->device);
c6517b79 371 kref_put(&sfp->f_ref, sg_remove_sfp);
cc833acb
DG		 372 sdp->open_cnt--;
373
374 /* possibly many open()s waiting on exlude clearing, start many;
375 * only open(O_EXCL)s wait on 0==open_cnt so only start one */
376 if (sdp->exclude) {
377 sdp->exclude = false;
378 wake_up_interruptible_all(&sdp->open_wait);
379 } else if (0 == sdp->open_cnt) {
380 wake_up_interruptible(&sdp->open_wait);
381 }
382 mutex_unlock(&sdp->open_rel_lock);
1da177e4
LT		 383 return 0;
384}
385
386static ssize_t
387sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
388{
1da177e4
LT		 389 Sg_device *sdp;
390 Sg_fd *sfp;
391 Sg_request *srp;
392 int req_pack_id = -1;
1da177e4 393 sg_io_hdr_t *hp;
cb59e840 394 struct sg_header *old_hdr = NULL;
395 int retval = 0;
1da177e4
LT		 396
397 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
398 return -ENXIO;
95e159d6
HR		 399 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
400 "sg_read: count=%d\n", (int) count));
d6b10348 401
1da177e4
LT		 402 if (!access_ok(VERIFY_WRITE, buf, count))
403 return -EFAULT;
404 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840 405 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
406 if (!old_hdr)
407 return -ENOMEM;
408 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
409 retval = -EFAULT;
410 goto free_old_hdr;
411 }
412 if (old_hdr->reply_len < 0) {
1da177e4 413 if (count >= SZ_SG_IO_HDR) {
cb59e840 414 sg_io_hdr_t *new_hdr;
415 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
416 if (!new_hdr) {
417 retval = -ENOMEM;
418 goto free_old_hdr;
419 }
420 retval =__copy_from_user
421 (new_hdr, buf, SZ_SG_IO_HDR);
422 req_pack_id = new_hdr->pack_id;
423 kfree(new_hdr);
424 if (retval) {
425 retval = -EFAULT;
426 goto free_old_hdr;
427 }
1da177e4
LT		 428 }
429 } else
cb59e840 430 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 431 }
432 srp = sg_get_rq_mark(sfp, req_pack_id);
433 if (!srp) { /* now wait on packet to arrive */
cc833acb 434 if (atomic_read(&sdp->detaching)) {
cb59e840 435 retval = -ENODEV;
436 goto free_old_hdr;
437 }
438 if (filp->f_flags & O_NONBLOCK) {
439 retval = -EAGAIN;
440 goto free_old_hdr;
441 }
3f0c6aba 442 retval = wait_event_interruptible(sfp->read_wait,
cc833acb 443 (atomic_read(&sdp->detaching) ||
3f0c6aba 444 (srp = sg_get_rq_mark(sfp, req_pack_id))));
cc833acb 445 if (atomic_read(&sdp->detaching)) {
794c10fa
JE		 446 retval = -ENODEV;
447 goto free_old_hdr;
448 }
449 if (retval) {
cb59e840 450 /* -ERESTARTSYS as signal hit process */
451 goto free_old_hdr;
1da177e4
LT		 452 }
453 }
cb59e840 454 if (srp->header.interface_id != '\0') {
455 retval = sg_new_read(sfp, buf, count, srp);
456 goto free_old_hdr;
457 }
1da177e4
LT		 458
459 hp = &srp->header;
cb59e840 460 if (old_hdr == NULL) {
461 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
462 if (! old_hdr) {
463 retval = -ENOMEM;
464 goto free_old_hdr;
465 }
466 }
467 memset(old_hdr, 0, SZ_SG_HEADER);
468 old_hdr->reply_len = (int) hp->timeout;
469 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
470 old_hdr->pack_id = hp->pack_id;
471 old_hdr->twelve_byte =
1da177e4 472 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840 473 old_hdr->target_status = hp->masked_status;
474 old_hdr->host_status = hp->host_status;
475 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 476 if ((CHECK_CONDITION & hp->masked_status) ||
477 (DRIVER_SENSE & hp->driver_status))
cb59e840 478 memcpy(old_hdr->sense_buffer, srp->sense_b,
479 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 480 switch (hp->host_status) {
481 /* This setup of 'result' is for backward compatibility and is best
482 ignored by the user who should use target, host + driver status */
483 case DID_OK:
484 case DID_PASSTHROUGH:
485 case DID_SOFT_ERROR:
cb59e840 486 old_hdr->result = 0;
1da177e4
LT		 487 break;
488 case DID_NO_CONNECT:
489 case DID_BUS_BUSY:
490 case DID_TIME_OUT:
cb59e840 491 old_hdr->result = EBUSY;
1da177e4
LT		 492 break;
493 case DID_BAD_TARGET:
494 case DID_ABORT:
495 case DID_PARITY:
496 case DID_RESET:
497 case DID_BAD_INTR:
cb59e840 498 old_hdr->result = EIO;
1da177e4
LT		 499 break;
500 case DID_ERROR:
cb59e840 501 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 502 hp->masked_status == GOOD) ? 0 : EIO;
503 break;
504 default:
cb59e840 505 old_hdr->result = EIO;
1da177e4
LT		 506 break;
507 }
508
509 /* Now copy the result back to the user buffer. */
510 if (count >= SZ_SG_HEADER) {
cb59e840 511 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
512 retval = -EFAULT;
513 goto free_old_hdr;
514 }
1da177e4 515 buf += SZ_SG_HEADER;
cb59e840 516 if (count > old_hdr->reply_len)
517 count = old_hdr->reply_len;
1da177e4 518 if (count > SZ_SG_HEADER) {
cb59e840 519 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
520 retval = -EFAULT;
521 goto free_old_hdr;
522 }
1da177e4
LT		 523 }
524 } else
cb59e840 525 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 526 sg_finish_rem_req(srp);
97d27b0d 527 sg_remove_request(sfp, srp);
cb59e840 528 retval = count;
529free_old_hdr:
c9475cb0 530 kfree(old_hdr);
cb59e840 531 return retval;
1da177e4
LT		 532}
533
534static ssize_t
535sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
536{
537 sg_io_hdr_t *hp = &srp->header;
3b524a68 538 int err = 0, err2;
1da177e4
LT		 539 int len;
540
541 if (count < SZ_SG_IO_HDR) {
542 err = -EINVAL;
543 goto err_out;
544 }
545 hp->sb_len_wr = 0;
546 if ((hp->mx_sb_len > 0) && hp->sbp) {
547 if ((CHECK_CONDITION & hp->masked_status) ||
548 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 549 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 550 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
551 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
552 len = (len > sb_len) ? sb_len : len;
553 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
554 err = -EFAULT;
555 goto err_out;
556 }
557 hp->sb_len_wr = len;
558 }
559 }
560 if (hp->masked_status || hp->host_status || hp->driver_status)
561 hp->info |= SG_INFO_CHECK;
562 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
563 err = -EFAULT;
564 goto err_out;
565 }
0b6cb26c 566err_out:
3b524a68 567 err2 = sg_finish_rem_req(srp);
97d27b0d 568 sg_remove_request(sfp, srp);
3b524a68 569 return err ? : err2 ? : count;
1da177e4
LT		 570}
571
572static ssize_t
573sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
574{
575 int mxsize, cmd_size, k;
576 int input_size, blocking;
577 unsigned char opcode;
578 Sg_device *sdp;
579 Sg_fd *sfp;
580 Sg_request *srp;
581 struct sg_header old_hdr;
582 sg_io_hdr_t *hp;
65c26a0f 583 unsigned char cmnd[SG_MAX_CDB_SIZE];
1da177e4 584
db68ce10 585 if (unlikely(uaccess_kernel()))
128394ef
AV		 586 return -EINVAL;
587
1da177e4
LT		 588 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
589 return -ENXIO;
95e159d6
HR		 590 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
591 "sg_write: count=%d\n", (int) count));
cc833acb 592 if (atomic_read(&sdp->detaching))
1da177e4
LT		 593 return -ENODEV;
594 if (!((filp->f_flags & O_NONBLOCK) ||
595 scsi_block_when_processing_errors(sdp->device)))
596 return -ENXIO;
597
598 if (!access_ok(VERIFY_READ, buf, count))
599 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
600 if (count < SZ_SG_HEADER)
601 return -EIO;
602 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
603 return -EFAULT;
604 blocking = !(filp->f_flags & O_NONBLOCK);
605 if (old_hdr.reply_len < 0)
a2dd3b4c
TB		 606 return sg_new_write(sfp, filp, buf, count,
607 blocking, 0, 0, NULL);
1da177e4
LT		 608 if (count < (SZ_SG_HEADER + 6))
609 return -EIO; /* The minimum scsi command length is 6 bytes. */
610
611 if (!(srp = sg_add_request(sfp))) {
95e159d6
HR		 612 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
613 "sg_write: queue full\n"));
1da177e4
LT		 614 return -EDOM;
615 }
616 buf += SZ_SG_HEADER;
617 __get_user(opcode, buf);
1bc0eb04 618 mutex_lock(&sfp->f_mutex);
1da177e4 619 if (sfp->next_cmd_len > 0) {
1da177e4
LT		 620 cmd_size = sfp->next_cmd_len;
621 sfp->next_cmd_len = 0; /* reset so only this write() effected */
622 } else {
623 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
624 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
625 cmd_size = 12;
626 }
1bc0eb04 627 mutex_unlock(&sfp->f_mutex);
95e159d6 628 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1da177e4
LT		 629 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
630/* Determine buffer size. */
631 input_size = count - cmd_size;
632 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
633 mxsize -= SZ_SG_HEADER;
634 input_size -= SZ_SG_HEADER;
635 if (input_size < 0) {
636 sg_remove_request(sfp, srp);
637 return -EIO; /* User did not pass enough bytes for this command. */
638 }
639 hp = &srp->header;
640 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
641 hp->cmd_len = (unsigned char) cmd_size;
642 hp->iovec_count = 0;
643 hp->mx_sb_len = 0;
644 if (input_size > 0)
645 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
646 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
647 else
648 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
649 hp->dxfer_len = mxsize;
5ecee0a3
DG		 650 if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||
651 (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV))
fad7f01e
FT		 652 hp->dxferp = (char __user *)buf + cmd_size;
653 else
654 hp->dxferp = NULL;
1da177e4
LT		 655 hp->sbp = NULL;
656 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
657 hp->flags = input_size; /* structure abuse ... */
658 hp->pack_id = old_hdr.pack_id;
659 hp->usr_ptr = NULL;
660 if (__copy_from_user(cmnd, buf, cmd_size))
661 return -EFAULT;
662 /*
663 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
664 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
665 * is a non-zero input_size, so emit a warning.
666 */
eaa3e22e 667 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
28676d86
JT		 668 printk_ratelimited(KERN_WARNING
669 "sg_write: data in/out %d/%d bytes "
670 "for SCSI command 0x%x-- guessing "
671 "data in;\n program %s not setting "
672 "count and/or reply_len properly\n",
673 old_hdr.reply_len - (int)SZ_SG_HEADER,
674 input_size, (unsigned int) cmnd[0],
675 current->comm);
eaa3e22e 676 }
1da177e4
LT		 677 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
678 return (k < 0) ? k : count;
679}
680
681static ssize_t
0b07de85 682sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
a2dd3b4c 683 size_t count, int blocking, int read_only, int sg_io_owned,
0b07de85 684 Sg_request **o_srp)
1da177e4
LT		 685{
686 int k;
687 Sg_request *srp;
688 sg_io_hdr_t *hp;
65c26a0f 689 unsigned char cmnd[SG_MAX_CDB_SIZE];
1da177e4
LT		 690 int timeout;
691 unsigned long ul_timeout;
692
693 if (count < SZ_SG_IO_HDR)
694 return -EINVAL;
695 if (!access_ok(VERIFY_READ, buf, count))
696 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
697
698 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
699 if (!(srp = sg_add_request(sfp))) {
95e159d6
HR		 700 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
701 "sg_new_write: queue full\n"));
1da177e4
LT		 702 return -EDOM;
703 }
a2dd3b4c 704 srp->sg_io_owned = sg_io_owned;
1da177e4
LT		 705 hp = &srp->header;
706 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
707 sg_remove_request(sfp, srp);
708 return -EFAULT;
709 }
710 if (hp->interface_id != 'S') {
711 sg_remove_request(sfp, srp);
712 return -ENOSYS;
713 }
714 if (hp->flags & SG_FLAG_MMAP_IO) {
715 if (hp->dxfer_len > sfp->reserve.bufflen) {
716 sg_remove_request(sfp, srp);
717 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
718 }
719 if (hp->flags & SG_FLAG_DIRECT_IO) {
720 sg_remove_request(sfp, srp);
721 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
722 }
1bc0eb04 723 if (sfp->res_in_use) {
1da177e4
LT		 724 sg_remove_request(sfp, srp);
725 return -EBUSY; /* reserve buffer already being used */
726 }
727 }
728 ul_timeout = msecs_to_jiffies(srp->header.timeout);
729 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
730 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
731 sg_remove_request(sfp, srp);
732 return -EMSGSIZE;
733 }
734 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
735 sg_remove_request(sfp, srp);
736 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
737 }
738 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
739 sg_remove_request(sfp, srp);
740 return -EFAULT;
741 }
14e507b8 742 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 743 sg_remove_request(sfp, srp);
744 return -EPERM;
745 }
746 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
747 if (k < 0)
748 return k;
749 if (o_srp)
750 *o_srp = srp;
751 return count;
752}
753
754static int
755sg_common_write(Sg_fd * sfp, Sg_request * srp,
756 unsigned char *cmnd, int timeout, int blocking)
757{
5af2e382 758 int k, at_head;
1da177e4
LT		 759 Sg_device *sdp = sfp->parentdp;
760 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 761
762 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
763 hp->status = 0;
764 hp->masked_status = 0;
765 hp->msg_status = 0;
766 hp->info = 0;
767 hp->host_status = 0;
768 hp->driver_status = 0;
769 hp->resid = 0;
95e159d6
HR		 770 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
771 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
772 (int) cmnd[0], (int) hp->cmd_len));
1da177e4 773
f930c704 774 if (hp->dxfer_len >= SZ_256M)
28676d86
JT		 775 return -EINVAL;
776
10865dfa
FT		 777 k = sg_start_req(srp, cmnd);
778 if (k) {
95e159d6
HR		 779 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
780 "sg_common_write: start_req err=%d\n", k));
1da177e4 781 sg_finish_rem_req(srp);
97d27b0d 782 sg_remove_request(sfp, srp);
1da177e4
LT		 783 return k; /* probably out of space --> ENOMEM */
784 }
cc833acb 785 if (atomic_read(&sdp->detaching)) {
f3951a37 786 if (srp->bio) {
82ed4db4 787 scsi_req_free_cmd(scsi_req(srp->rq));
2a842aca 788 blk_end_request_all(srp->rq, BLK_STS_IOERR);
f3951a37
CO		 789 srp->rq = NULL;
790 }
791
1da177e4 792 sg_finish_rem_req(srp);
97d27b0d 793 sg_remove_request(sfp, srp);
1da177e4
LT		 794 return -ENODEV;
795 }
1da177e4 796
cb59e840 797 hp->duration = jiffies_to_msecs(jiffies);
16070cc1
DG		 798 if (hp->interface_id != '\0' && /* v3 (or later) interface */
799 (SG_FLAG_Q_AT_TAIL & hp->flags))
800 at_head = 0;
801 else
802 at_head = 1;
10db10d1
FT		 803
804 srp->rq->timeout = timeout;
c6517b79 805 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
10db10d1 806 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
16070cc1 807 srp->rq, at_head, sg_rq_end_io);
10db10d1 808 return 0;
1da177e4
LT		 809}
810
6acddc5e
JE		 811static int srp_done(Sg_fd *sfp, Sg_request *srp)
812{
813 unsigned long flags;
814 int ret;
815
816 read_lock_irqsave(&sfp->rq_list_lock, flags);
817 ret = srp->done;
818 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
819 return ret;
820}
821
46f69e6a
AM		 822static int max_sectors_bytes(struct request_queue *q)
823{
824 unsigned int max_sectors = queue_max_sectors(q);
825
826 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
827
828 return max_sectors << 9;
829}
830
4759df90
HR		 831static void
832sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo)
833{
834 Sg_request *srp;
835 int val;
836 unsigned int ms;
837
838 val = 0;
839 list_for_each_entry(srp, &sfp->rq_list, entry) {
587c3c9f 840 if (val >= SG_MAX_QUEUE)
4759df90 841 break;
4759df90
HR		 842 rinfo[val].req_state = srp->done + 1;
843 rinfo[val].problem =
844 srp->header.masked_status &
845 srp->header.host_status &
846 srp->header.driver_status;
847 if (srp->done)
848 rinfo[val].duration =
849 srp->header.duration;
850 else {
851 ms = jiffies_to_msecs(jiffies);
852 rinfo[val].duration =
853 (ms > srp->header.duration) ?
854 (ms - srp->header.duration) : 0;
855 }
856 rinfo[val].orphan = srp->orphan;
857 rinfo[val].sg_io_owned = srp->sg_io_owned;
858 rinfo[val].pack_id = srp->header.pack_id;
859 rinfo[val].usr_ptr = srp->header.usr_ptr;
860 val++;
861 }
862}
863
37b9d1e0 864static long
f4927c45 865sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 866{
867 void __user *p = (void __user *)arg;
868 int __user *ip = p;
176aa9d6 869 int result, val, read_only;
1da177e4
LT		 870 Sg_device *sdp;
871 Sg_fd *sfp;
872 Sg_request *srp;
873 unsigned long iflags;
874
875 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
876 return -ENXIO;
abf54393 877
95e159d6
HR		 878 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
879 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
1da177e4
LT		 880 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
881
882 switch (cmd_in) {
883 case SG_IO:
cc833acb 884 if (atomic_read(&sdp->detaching))
dddbf8d9
JE		 885 return -ENODEV;
886 if (!scsi_block_when_processing_errors(sdp->device))
887 return -ENXIO;
888 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
889 return -EFAULT;
890 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
891 1, read_only, 1, &srp);
892 if (result < 0)
893 return result;
3f0c6aba 894 result = wait_event_interruptible(sfp->read_wait,
cc833acb
DG		 895 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
896 if (atomic_read(&sdp->detaching))
794c10fa
JE		 897 return -ENODEV;
898 write_lock_irq(&sfp->rq_list_lock);
899 if (srp->done) {
900 srp->done = 2;
dddbf8d9 901 write_unlock_irq(&sfp->rq_list_lock);
794c10fa
JE		 902 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
903 return (result < 0) ? result : 0;
1da177e4 904 }
794c10fa
JE		 905 srp->orphan = 1;
906 write_unlock_irq(&sfp->rq_list_lock);
907 return result; /* -ERESTARTSYS because signal hit process */
1da177e4
LT		 908 case SG_SET_TIMEOUT:
909 result = get_user(val, ip);
910 if (result)
911 return result;
912 if (val < 0)
913 return -EIO;
f8630bd7
PB		 914 if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ))
915 val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ),
b9b6e80a 916 INT_MAX);
1da177e4 917 sfp->timeout_user = val;
f8630bd7 918 sfp->timeout = mult_frac(val, HZ, USER_HZ);
1da177e4
LT		 919
920 return 0;
921 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
922 /* strange ..., for backward compatibility */
923 return sfp->timeout_user;
924 case SG_SET_FORCE_LOW_DMA:
745dfa0d
HR		 925 /*
926 * N.B. This ioctl never worked properly, but failed to
927 * return an error value. So returning '0' to keep compability
928 * with legacy applications.
929 */
1da177e4
LT		 930 return 0;
931 case SG_GET_LOW_DMA:
745dfa0d 932 return put_user((int) sdp->device->host->unchecked_isa_dma, ip);
1da177e4
LT		 933 case SG_GET_SCSI_ID:
934 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
935 return -EFAULT;
936 else {
937 sg_scsi_id_t __user *sg_idp = p;
938
cc833acb 939 if (atomic_read(&sdp->detaching))
1da177e4
LT		 940 return -ENODEV;
941 __put_user((int) sdp->device->host->host_no,
942 &sg_idp->host_no);
943 __put_user((int) sdp->device->channel,
944 &sg_idp->channel);
945 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
946 __put_user((int) sdp->device->lun, &sg_idp->lun);
947 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
948 __put_user((short) sdp->device->host->cmd_per_lun,
949 &sg_idp->h_cmd_per_lun);
950 __put_user((short) sdp->device->queue_depth,
951 &sg_idp->d_queue_depth);
952 __put_user(0, &sg_idp->unused[0]);
953 __put_user(0, &sg_idp->unused[1]);
954 return 0;
955 }
956 case SG_SET_FORCE_PACK_ID:
957 result = get_user(val, ip);
958 if (result)
959 return result;
960 sfp->force_packid = val ? 1 : 0;
961 return 0;
962 case SG_GET_PACK_ID:
963 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
964 return -EFAULT;
965 read_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9 966 list_for_each_entry(srp, &sfp->rq_list, entry) {
1da177e4
LT		 967 if ((1 == srp->done) && (!srp->sg_io_owned)) {
968 read_unlock_irqrestore(&sfp->rq_list_lock,
969 iflags);
970 __put_user(srp->header.pack_id, ip);
971 return 0;
972 }
973 }
974 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
975 __put_user(-1, ip);
976 return 0;
977 case SG_GET_NUM_WAITING:
978 read_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9
HR		 979 val = 0;
980 list_for_each_entry(srp, &sfp->rq_list, entry) {
1da177e4
LT		 981 if ((1 == srp->done) && (!srp->sg_io_owned))
982 ++val;
983 }
984 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
985 return put_user(val, ip);
986 case SG_GET_SG_TABLESIZE:
987 return put_user(sdp->sg_tablesize, ip);
988 case SG_SET_RESERVED_SIZE:
989 result = get_user(val, ip);
990 if (result)
991 return result;
992 if (val < 0)
993 return -EINVAL;
44ec9542 994 val = min_t(int, val,
46f69e6a 995 max_sectors_bytes(sdp->device->request_queue));
1bc0eb04 996 mutex_lock(&sfp->f_mutex);
1da177e4 997 if (val != sfp->reserve.bufflen) {
1bc0eb04
HR		 998 if (sfp->mmap_called ||
999 sfp->res_in_use) {
1000 mutex_unlock(&sfp->f_mutex);
1da177e4 1001 return -EBUSY;
1bc0eb04
HR		 1002 }
1003
95e159d6 1004 sg_remove_scat(sfp, &sfp->reserve);
1da177e4
LT		 1005 sg_build_reserve(sfp, val);
1006 }
1bc0eb04 1007 mutex_unlock(&sfp->f_mutex);
1da177e4
LT		 1008 return 0;
1009 case SG_GET_RESERVED_SIZE:
44ec9542 1010 val = min_t(int, sfp->reserve.bufflen,
46f69e6a 1011 max_sectors_bytes(sdp->device->request_queue));
1da177e4
LT		 1012 return put_user(val, ip);
1013 case SG_SET_COMMAND_Q:
1014 result = get_user(val, ip);
1015 if (result)
1016 return result;
1017 sfp->cmd_q = val ? 1 : 0;
1018 return 0;
1019 case SG_GET_COMMAND_Q:
1020 return put_user((int) sfp->cmd_q, ip);
1021 case SG_SET_KEEP_ORPHAN:
1022 result = get_user(val, ip);
1023 if (result)
1024 return result;
1025 sfp->keep_orphan = val;
1026 return 0;
1027 case SG_GET_KEEP_ORPHAN:
1028 return put_user((int) sfp->keep_orphan, ip);
1029 case SG_NEXT_CMD_LEN:
1030 result = get_user(val, ip);
1031 if (result)
1032 return result;
bf33f87d 1033 if (val > SG_MAX_CDB_SIZE)
1034 return -ENOMEM;
1da177e4
LT		 1035 sfp->next_cmd_len = (val > 0) ? val : 0;
1036 return 0;
1037 case SG_GET_VERSION_NUM:
1038 return put_user(sg_version_num, ip);
1039 case SG_GET_ACCESS_COUNT:
1040 /* faked - we don't have a real access count anymore */
1041 val = (sdp->device ? 1 : 0);
1042 return put_user(val, ip);
1043 case SG_GET_REQUEST_TABLE:
1044 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1045 return -EFAULT;
1046 else {
cb59e840 1047 sg_req_info_t *rinfo;
cb59e840 1048
3e009749
HR		 1049 rinfo = kzalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1050 GFP_KERNEL);
cb59e840 1051 if (!rinfo)
1052 return -ENOMEM;
1da177e4 1053 read_lock_irqsave(&sfp->rq_list_lock, iflags);
4759df90 1054 sg_fill_request_table(sfp, rinfo);
1da177e4 1055 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
109bade9 1056 result = __copy_to_user(p, rinfo,
cb59e840 1057 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1058 result = result ? -EFAULT : 0;
1059 kfree(rinfo);
1060 return result;
1da177e4
LT		 1061 }
1062 case SG_EMULATED_HOST:
cc833acb 1063 if (atomic_read(&sdp->detaching))
1da177e4
LT		 1064 return -ENODEV;
1065 return put_user(sdp->device->host->hostt->emulated, ip);
1da177e4 1066 case SCSI_IOCTL_SEND_COMMAND:
cc833acb 1067 if (atomic_read(&sdp->detaching))
1da177e4
LT		 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 }
e915e872 1078 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, 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;
44ec9542 1085 case BLKSECTGET:
46f69e6a 1086 return put_user(max_sectors_bytes(sdp->device->request_queue),
44ec9542 1087 ip);
6da127ad
CS		 1088 case BLKTRACESETUP:
1089 return blk_trace_setup(sdp->device->request_queue,
1090 sdp->disk->disk_name,
76e3a19d 1091 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
7475c8ae 1092 NULL, p);
6da127ad
CS		 1093 case BLKTRACESTART:
1094 return blk_trace_startstop(sdp->device->request_queue, 1);
1095 case BLKTRACESTOP:
1096 return blk_trace_startstop(sdp->device->request_queue, 0);
1097 case BLKTRACETEARDOWN:
1098 return blk_trace_remove(sdp->device->request_queue);
906d15fb
CH		 1099 case SCSI_IOCTL_GET_IDLUN:
1100 case SCSI_IOCTL_GET_BUS_NUMBER:
1101 case SCSI_IOCTL_PROBE_HOST:
1102 case SG_GET_TRANSFORM:
1103 case SG_SCSI_RESET:
1104 if (atomic_read(&sdp->detaching))
1105 return -ENODEV;
1106 break;
1da177e4
LT		 1107 default:
1108 if (read_only)
1109 return -EPERM; /* don't know so take safe approach */
906d15fb 1110 break;
1da177e4 1111 }
906d15fb
CH		 1112
1113 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1114 cmd_in, filp->f_flags & O_NDELAY);
1115 if (result)
1116 return result;
1117 return scsi_ioctl(sdp->device, cmd_in, p);
1da177e4
LT		 1118}
1119
1120#ifdef CONFIG_COMPAT
1121static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1122{
1123 Sg_device *sdp;
1124 Sg_fd *sfp;
1125 struct scsi_device *sdev;
1126
1127 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1128 return -ENXIO;
1129
1130 sdev = sdp->device;
1131 if (sdev->host->hostt->compat_ioctl) {
1132 int ret;
1133
1134 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1135
1136 return ret;
1137 }
1138
1139 return -ENOIOCTLCMD;
1140}
1141#endif
1142
afc9a42b 1143static __poll_t
1da177e4
LT		 1144sg_poll(struct file *filp, poll_table * wait)
1145{
afc9a42b 1146 __poll_t res = 0;
1da177e4
LT		 1147 Sg_device *sdp;
1148 Sg_fd *sfp;
1149 Sg_request *srp;
1150 int count = 0;
1151 unsigned long iflags;
1152
ebaf466b
JE		 1153 sfp = filp->private_data;
1154 if (!sfp)
a9a08845 1155 return EPOLLERR;
ebaf466b
JE		 1156 sdp = sfp->parentdp;
1157 if (!sdp)
a9a08845 1158 return EPOLLERR;
1da177e4
LT		 1159 poll_wait(filp, &sfp->read_wait, wait);
1160 read_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9 1161 list_for_each_entry(srp, &sfp->rq_list, entry) {
1da177e4
LT		 1162 /* if any read waiting, flag it */
1163 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
a9a08845 1164 res = EPOLLIN | EPOLLRDNORM;
1da177e4
LT		 1165 ++count;
1166 }
1167 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1168
cc833acb 1169 if (atomic_read(&sdp->detaching))
a9a08845 1170 res |= EPOLLHUP;
1da177e4
LT		 1171 else if (!sfp->cmd_q) {
1172 if (0 == count)
a9a08845 1173 res |= EPOLLOUT | EPOLLWRNORM;
1da177e4 1174 } else if (count < SG_MAX_QUEUE)
a9a08845 1175 res |= EPOLLOUT | EPOLLWRNORM;
95e159d6 1176 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
fcc5a652 1177 "sg_poll: res=0x%x\n", (__force u32) res));
1da177e4
LT		 1178 return res;
1179}
1180
1181static int
1182sg_fasync(int fd, struct file *filp, int mode)
1183{
1da177e4
LT		 1184 Sg_device *sdp;
1185 Sg_fd *sfp;
1186
1187 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1188 return -ENXIO;
95e159d6
HR		 1189 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1190 "sg_fasync: mode=%d\n", mode));
1da177e4 1191
60aa4924 1192 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1da177e4
LT		 1193}
1194
a13ff0bb 1195static int
11bac800 1196sg_vma_fault(struct vm_fault *vmf)
1da177e4 1197{
11bac800 1198 struct vm_area_struct *vma = vmf->vma;
1da177e4 1199 Sg_fd *sfp;
d6b10348 1200 unsigned long offset, len, sa;
1da177e4 1201 Sg_scatter_hold *rsv_schp;
10db10d1 1202 int k, length;
1da177e4
LT		 1203
1204 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1205 return VM_FAULT_SIGBUS;
1da177e4 1206 rsv_schp = &sfp->reserve;
a13ff0bb 1207 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1208 if (offset >= rsv_schp->bufflen)
a13ff0bb 1209 return VM_FAULT_SIGBUS;
95e159d6
HR		 1210 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1211 "sg_vma_fault: offset=%lu, scatg=%d\n",
1212 offset, rsv_schp->k_use_sg));
d6b10348 1213 sa = vma->vm_start;
10db10d1
FT		 1214 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1215 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1216 len = vma->vm_end - sa;
10db10d1 1217 len = (len < length) ? len : length;
d6b10348 1218 if (offset < len) {
10db10d1
FT		 1219 struct page *page = nth_page(rsv_schp->pages[k],
1220 offset >> PAGE_SHIFT);
d6b10348 1221 get_page(page); /* increment page count */
a13ff0bb
NP		 1222 vmf->page = page;
1223 return 0; /* success */
1da177e4 1224 }
d6b10348
MC		 1225 sa += len;
1226 offset -= len;
1da177e4 1227 }
d6b10348 1228
a13ff0bb 1229 return VM_FAULT_SIGBUS;
1da177e4
LT		 1230}
1231
f0f37e2f 1232static const struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1233 .fault = sg_vma_fault,
1da177e4
LT		 1234};
1235
1236static int
1237sg_mmap(struct file *filp, struct vm_area_struct *vma)
1238{
1239 Sg_fd *sfp;
d6b10348 1240 unsigned long req_sz, len, sa;
1da177e4 1241 Sg_scatter_hold *rsv_schp;
10db10d1 1242 int k, length;
6a8dadcc 1243 int ret = 0;
1da177e4
LT		 1244
1245 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1246 return -ENXIO;
cb59e840 1247 req_sz = vma->vm_end - vma->vm_start;
95e159d6
HR		 1248 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1249 "sg_mmap starting, vm_start=%p, len=%d\n",
1250 (void *) vma->vm_start, (int) req_sz));
1da177e4
LT		 1251 if (vma->vm_pgoff)
1252 return -EINVAL; /* want no offset */
1253 rsv_schp = &sfp->reserve;
6a8dadcc
TP		 1254 mutex_lock(&sfp->f_mutex);
1255 if (req_sz > rsv_schp->bufflen) {
1256 ret = -ENOMEM; /* cannot map more than reserved buffer */
1257 goto out;
1258 }
1da177e4 1259
d6b10348 1260 sa = vma->vm_start;
10db10d1
FT		 1261 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1262 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1263 len = vma->vm_end - sa;
10db10d1 1264 len = (len < length) ? len : length;
d6b10348 1265 sa += len;
1da177e4 1266 }
d6b10348 1267
f9aed0e2 1268 sfp->mmap_called = 1;
461c7fa1 1269 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1da177e4
LT		 1270 vma->vm_private_data = sfp;
1271 vma->vm_ops = &sg_mmap_vm_ops;
6a8dadcc
TP		 1272out:
1273 mutex_unlock(&sfp->f_mutex);
1274 return ret;
1da177e4
LT		 1275}
1276
cc833acb
DG		 1277static void
1278sg_rq_end_io_usercontext(struct work_struct *work)
c96952ed
FT		 1279{
1280 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1281 struct sg_fd *sfp = srp->parentfp;
1282
1283 sg_finish_rem_req(srp);
97d27b0d 1284 sg_remove_request(sfp, srp);
c96952ed
FT		 1285 kref_put(&sfp->f_ref, sg_remove_sfp);
1286}
1287
a91a3a20
FT		 1288/*
1289 * This function is a "bottom half" handler that is called by the mid
1290 * level when a command is completed (or has failed).
1291 */
cc833acb 1292static void
2a842aca 1293sg_rq_end_io(struct request *rq, blk_status_t status)
1da177e4 1294{
a91a3a20 1295 struct sg_request *srp = rq->end_io_data;
82ed4db4 1296 struct scsi_request *req = scsi_req(rq);
c6517b79 1297 Sg_device *sdp;
1da177e4 1298 Sg_fd *sfp;
1da177e4 1299 unsigned long iflags;
cb59e840 1300 unsigned int ms;
a91a3a20 1301 char *sense;
c6517b79 1302 int result, resid, done = 1;
1da177e4 1303
c6517b79 1304 if (WARN_ON(srp->done != 0))
1da177e4 1305 return;
c6517b79 1306
1da177e4 1307 sfp = srp->parentfp;
c6517b79 1308 if (WARN_ON(sfp == NULL))
1da177e4 1309 return;
c6517b79
TB		 1310
1311 sdp = sfp->parentdp;
cc833acb
DG		 1312 if (unlikely(atomic_read(&sdp->detaching)))
1313 pr_info("%s: device detaching\n", __func__);
1da177e4 1314
82ed4db4 1315 sense = req->sense;
17d5363b 1316 result = req->result;
82ed4db4 1317 resid = req->resid_len;
1da177e4 1318
95e159d6
HR		 1319 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1320 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1321 srp->header.pack_id, result));
d6b10348 1322 srp->header.resid = resid;
cb59e840 1323 ms = jiffies_to_msecs(jiffies);
1324 srp->header.duration = (ms > srp->header.duration) ?
1325 (ms - srp->header.duration) : 0;
d6b10348 1326 if (0 != result) {
1da177e4
LT		 1327 struct scsi_sense_hdr sshdr;
1328
d6b10348
MC		 1329 srp->header.status = 0xff & result;
1330 srp->header.masked_status = status_byte(result);
1331 srp->header.msg_status = msg_byte(result);
1332 srp->header.host_status = host_byte(result);
1333 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1334 if ((sdp->sgdebug > 0) &&
1335 ((CHECK_CONDITION == srp->header.masked_status) ||
1336 (COMMAND_TERMINATED == srp->header.masked_status)))
d811b848 1337 __scsi_print_sense(sdp->device, __func__, sense,
d6b10348 1338 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1339
1340 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1341 if (driver_byte(result) != 0
1342 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1343 && !scsi_sense_is_deferred(&sshdr)
1344 && sshdr.sense_key == UNIT_ATTENTION
1345 && sdp->device->removable) {
1346 /* Detected possible disc change. Set the bit - this */
1347 /* may be used if there are filesystems using this device */
1348 sdp->device->changed = 1;
1349 }
1350 }
82ed4db4
CH		 1351
1352 if (req->sense_len)
1353 memcpy(srp->sense_b, req->sense, SCSI_SENSE_BUFFERSIZE);
1354
1da177e4
LT		 1355 /* Rely on write phase to clean out srp status values, so no "else" */
1356
7568615c
TB		 1357 /*
1358 * Free the request as soon as it is complete so that its resources
1359 * can be reused without waiting for userspace to read() the
1360 * result. But keep the associated bio (if any) around until
1361 * blk_rq_unmap_user() can be called from user context.
1362 */
1363 srp->rq = NULL;
82ed4db4 1364 scsi_req_free_cmd(scsi_req(rq));
7568615c
TB		 1365 __blk_put_request(rq->q, rq);
1366
c6517b79
TB		 1367 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1368 if (unlikely(srp->orphan)) {
1da177e4
LT		 1369 if (sfp->keep_orphan)
1370 srp->sg_io_owned = 0;
c6517b79
TB		 1371 else
1372 done = 0;
1da177e4 1373 }
c6517b79
TB		 1374 srp->done = done;
1375 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1376
1377 if (likely(done)) {
1378 /* Now wake up any sg_read() that is waiting for this
1379 * packet.
1380 */
1da177e4 1381 wake_up_interruptible(&sfp->read_wait);
c6517b79 1382 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
c96952ed 1383 kref_put(&sfp->f_ref, sg_remove_sfp);
015640ed
FT		 1384 } else {
1385 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1386 schedule_work(&srp->ew.work);
1387 }
1da177e4
LT		 1388}
1389
828c0950 1390static const struct file_operations sg_fops = {
1da177e4
LT		 1391 .owner = THIS_MODULE,
1392 .read = sg_read,
1393 .write = sg_write,
1394 .poll = sg_poll,
37b9d1e0 1395 .unlocked_ioctl = sg_ioctl,
1da177e4
LT		 1396#ifdef CONFIG_COMPAT
1397 .compat_ioctl = sg_compat_ioctl,
1398#endif
1399 .open = sg_open,
1400 .mmap = sg_mmap,
1401 .release = sg_release,
1402 .fasync = sg_fasync,
6038f373 1403 .llseek = no_llseek,
1da177e4
LT		 1404};
1405
d253878b 1406static struct class *sg_sysfs_class;
1da177e4
LT		 1407
1408static int sg_sysfs_valid = 0;
1409
cc833acb
DG		 1410static Sg_device *
1411sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1412{
d6b10348 1413 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1414 Sg_device *sdp;
1415 unsigned long iflags;
7c07d613
JB		 1416 int error;
1417 u32 k;
1da177e4 1418
24669f75 1419 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4 1420 if (!sdp) {
cc833acb
DG		 1421 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1422 "failure\n", __func__);
7c07d613
JB		 1423 return ERR_PTR(-ENOMEM);
1424 }
c6517b79 1425
b98c52b5 1426 idr_preload(GFP_KERNEL);
7c07d613 1427 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4 1428
b98c52b5
TH		 1429 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1430 if (error < 0) {
1431 if (error == -ENOSPC) {
1432 sdev_printk(KERN_WARNING, scsidp,
1433 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1434 scsidp->type, SG_MAX_DEVS - 1);
1435 error = -ENODEV;
1436 } else {
cc833acb
DG		 1437 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1438 "allocation Sg_device failure: %d\n",
1439 __func__, error);
b98c52b5
TH		 1440 }
1441 goto out_unlock;
1da177e4 1442 }
b98c52b5 1443 k = error;
1da177e4 1444
95e159d6
HR		 1445 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1446 "sg_alloc: dev=%d \n", k));
1da177e4
LT		 1447 sprintf(disk->disk_name, "sg%d", k);
1448 disk->first_minor = k;
1449 sdp->disk = disk;
1450 sdp->device = scsidp;
cc833acb 1451 mutex_init(&sdp->open_rel_lock);
3442f802 1452 INIT_LIST_HEAD(&sdp->sfds);
cc833acb
DG		 1453 init_waitqueue_head(&sdp->open_wait);
1454 atomic_set(&sdp->detaching, 0);
1455 rwlock_init(&sdp->sfd_lock);
8a78362c 1456 sdp->sg_tablesize = queue_max_segments(q);
7c07d613 1457 sdp->index = k;
c6517b79 1458 kref_init(&sdp->d_ref);
b98c52b5 1459 error = 0;
c6517b79 1460
b98c52b5 1461out_unlock:
c6517b79 1462 write_unlock_irqrestore(&sg_index_lock, iflags);
b98c52b5 1463 idr_preload_end();
1da177e4 1464
7c07d613 1465 if (error) {
1da177e4 1466 kfree(sdp);
7c07d613
JB		 1467 return ERR_PTR(error);
1468 }
1469 return sdp;
1da177e4
LT		 1470}
1471
1472static int
cc833acb 1473sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1474{
ee959b00 1475 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1476 struct gendisk *disk;
1477 Sg_device *sdp = NULL;
1478 struct cdev * cdev = NULL;
7c07d613 1479 int error;
454e8957 1480 unsigned long iflags;
1da177e4
LT		 1481
1482 disk = alloc_disk(1);
1483 if (!disk) {
cc833acb 1484 pr_warn("%s: alloc_disk failed\n", __func__);
1da177e4
LT		 1485 return -ENOMEM;
1486 }
1487 disk->major = SCSI_GENERIC_MAJOR;
1488
1489 error = -ENOMEM;
1490 cdev = cdev_alloc();
1491 if (!cdev) {
cc833acb 1492 pr_warn("%s: cdev_alloc failed\n", __func__);
1da177e4
LT		 1493 goto out;
1494 }
1495 cdev->owner = THIS_MODULE;
1496 cdev->ops = &sg_fops;
1497
7c07d613
JB		 1498 sdp = sg_alloc(disk, scsidp);
1499 if (IS_ERR(sdp)) {
cc833acb 1500 pr_warn("%s: sg_alloc failed\n", __func__);
7c07d613 1501 error = PTR_ERR(sdp);
1da177e4
LT		 1502 goto out;
1503 }
1da177e4 1504
7c07d613 1505 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1506 if (error)
454e8957 1507 goto cdev_add_err;
5e3c34c1 1508
1da177e4
LT		 1509 sdp->cdev = cdev;
1510 if (sg_sysfs_valid) {
ee959b00 1511 struct device *sg_class_member;
1da177e4 1512
d73a1a67
GKH		 1513 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1514 MKDEV(SCSI_GENERIC_MAJOR,
1515 sdp->index),
1516 sdp, "%s", disk->disk_name);
d07e0361 1517 if (IS_ERR(sg_class_member)) {
cc833acb 1518 pr_err("%s: device_create failed\n", __func__);
d07e0361
FT		 1519 error = PTR_ERR(sg_class_member);
1520 goto cdev_add_err;
1521 }
d07e0361 1522 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1523 &sg_class_member->kobj, "generic");
1524 if (error)
cc833acb
DG		 1525 pr_err("%s: unable to make symlink 'generic' back "
1526 "to sg%d\n", __func__, sdp->index);
1da177e4 1527 } else
cc833acb 1528 pr_warn("%s: sg_sys Invalid\n", __func__);
1da177e4 1529
cc833acb
DG		 1530 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1531 "type %d\n", sdp->index, scsidp->type);
1da177e4 1532
ee959b00 1533 dev_set_drvdata(cl_dev, sdp);
a24484f2 1534
1da177e4
LT		 1535 return 0;
1536
454e8957 1537cdev_add_err:
7c07d613
JB		 1538 write_lock_irqsave(&sg_index_lock, iflags);
1539 idr_remove(&sg_index_idr, sdp->index);
1540 write_unlock_irqrestore(&sg_index_lock, iflags);
1541 kfree(sdp);
454e8957 1542
1da177e4
LT		 1543out:
1544 put_disk(disk);
1545 if (cdev)
1546 cdev_del(cdev);
1547 return error;
1548}
1549
cc833acb
DG		 1550static void
1551sg_device_destroy(struct kref *kref)
c6517b79
TB		 1552{
1553 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1554 unsigned long flags;
1555
1556 /* CAUTION! Note that the device can still be found via idr_find()
1557 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1558 * any other cleanup.
1559 */
1560
1561 write_lock_irqsave(&sg_index_lock, flags);
1562 idr_remove(&sg_index_idr, sdp->index);
1563 write_unlock_irqrestore(&sg_index_lock, flags);
1564
1565 SCSI_LOG_TIMEOUT(3,
95e159d6 1566 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
c6517b79
TB		 1567
1568 put_disk(sdp->disk);
1569 kfree(sdp);
1570}
1571
cc833acb
DG		 1572static void
1573sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1574{
ee959b00
TJ		 1575 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1576 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1577 unsigned long iflags;
1578 Sg_fd *sfp;
cc833acb 1579 int val;
1da177e4 1580
cc833acb 1581 if (!sdp)
1da177e4 1582 return;
cc833acb
DG		 1583 /* want sdp->detaching non-zero as soon as possible */
1584 val = atomic_inc_return(&sdp->detaching);
1585 if (val > 1)
1586 return; /* only want to do following once per device */
7c07d613 1587
95e159d6
HR		 1588 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1589 "%s\n", __func__));
c6517b79 1590
cc833acb 1591 read_lock_irqsave(&sdp->sfd_lock, iflags);
3442f802 1592 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
cc833acb 1593 wake_up_interruptible_all(&sfp->read_wait);
c6517b79 1594 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
7c07d613 1595 }
cc833acb
DG		 1596 wake_up_interruptible_all(&sdp->open_wait);
1597 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
7c07d613
JB		 1598
1599 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1600 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1601 cdev_del(sdp->cdev);
1602 sdp->cdev = NULL;
1da177e4 1603
cc833acb 1604 kref_put(&sdp->d_ref, sg_device_destroy);
1da177e4
LT		 1605}
1606
6460e75a
DG		 1607module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1608module_param_named(def_reserved_size, def_reserved_size, int,
1609 S_IRUGO | S_IWUSR);
1da177e4
LT		 1610module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1611
1612MODULE_AUTHOR("Douglas Gilbert");
1613MODULE_DESCRIPTION("SCSI generic (sg) driver");
1614MODULE_LICENSE("GPL");
1615MODULE_VERSION(SG_VERSION_STR);
f018fa55 1616MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1617
6460e75a
DG		 1618MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1619 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1620MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1621MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1622
1623static int __init
1624init_sg(void)
1625{
1626 int rc;
1627
6460e75a
DG		 1628 if (scatter_elem_sz < PAGE_SIZE) {
1629 scatter_elem_sz = PAGE_SIZE;
1630 scatter_elem_sz_prev = scatter_elem_sz;
1631 }
1da177e4
LT		 1632 if (def_reserved_size >= 0)
1633 sg_big_buff = def_reserved_size;
6460e75a
DG		 1634 else
1635 def_reserved_size = sg_big_buff;
1da177e4
LT		 1636
1637 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1638 SG_MAX_DEVS, "sg");
1639 if (rc)
1640 return rc;
d253878b 1641 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1642 if ( IS_ERR(sg_sysfs_class) ) {
1643 rc = PTR_ERR(sg_sysfs_class);
1644 goto err_out;
1645 }
1646 sg_sysfs_valid = 1;
1647 rc = scsi_register_interface(&sg_interface);
1648 if (0 == rc) {
1649#ifdef CONFIG_SCSI_PROC_FS
1650 sg_proc_init();
1651#endif /* CONFIG_SCSI_PROC_FS */
1652 return 0;
1653 }
d253878b 1654 class_destroy(sg_sysfs_class);
1da177e4
LT		 1655err_out:
1656 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1657 return rc;
1658}
1659
1660static void __exit
1661exit_sg(void)
1662{
1663#ifdef CONFIG_SCSI_PROC_FS
1664 sg_proc_cleanup();
1665#endif /* CONFIG_SCSI_PROC_FS */
1666 scsi_unregister_interface(&sg_interface);
d253878b 1667 class_destroy(sg_sysfs_class);
1da177e4
LT		 1668 sg_sysfs_valid = 0;
1669 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1670 SG_MAX_DEVS);
7c07d613 1671 idr_destroy(&sg_index_idr);
1da177e4
LT		 1672}
1673
cc833acb
DG		 1674static int
1675sg_start_req(Sg_request *srp, unsigned char *cmd)
10865dfa 1676{
626710c9 1677 int res;
10865dfa 1678 struct request *rq;
82ed4db4 1679 struct scsi_request *req;
44c7b0ea
FT		 1680 Sg_fd *sfp = srp->parentfp;
1681 sg_io_hdr_t *hp = &srp->header;
1682 int dxfer_len = (int) hp->dxfer_len;
1683 int dxfer_dir = hp->dxfer_direction;
626710c9 1684 unsigned int iov_count = hp->iovec_count;
44c7b0ea
FT		 1685 Sg_scatter_hold *req_schp = &srp->data;
1686 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1687 struct request_queue *q = sfp->parentdp->device->request_queue;
626710c9 1688 struct rq_map_data *md, map_data;
10865dfa 1689 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
65c26a0f 1690 unsigned char *long_cmdp = NULL;
10865dfa 1691
95e159d6
HR		 1692 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1693 "sg_start_req: dxfer_len=%d\n",
1694 dxfer_len));
44c7b0ea 1695
65c26a0f
DG		 1696 if (hp->cmd_len > BLK_MAX_CDB) {
1697 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1698 if (!long_cmdp)
1699 return -ENOMEM;
1700 }
1701
7772855a
TB		 1702 /*
1703 * NOTE
1704 *
1705 * With scsi-mq enabled, there are a fixed number of preallocated
1706 * requests equal in number to shost->can_queue. If all of the
1707 * preallocated requests are already in use, then using GFP_ATOMIC with
1708 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1709 * will cause blk_get_request() to sleep until an active command
1710 * completes, freeing up a request. Neither option is ideal, but
1711 * GFP_KERNEL is the better choice to prevent userspace from getting an
1712 * unexpected EWOULDBLOCK.
1713 *
1714 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1715 * does not sleep except under memory pressure.
1716 */
aebf526b
CH		 1717 rq = blk_get_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ?
1718 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, GFP_KERNEL);
a492f075 1719 if (IS_ERR(rq)) {
65c26a0f 1720 kfree(long_cmdp);
a492f075 1721 return PTR_ERR(rq);
65c26a0f 1722 }
82ed4db4 1723 req = scsi_req(rq);
10865dfa 1724
65c26a0f 1725 if (hp->cmd_len > BLK_MAX_CDB)
82ed4db4
CH		 1726 req->cmd = long_cmdp;
1727 memcpy(req->cmd, cmd, hp->cmd_len);
1728 req->cmd_len = hp->cmd_len;
10865dfa
FT		 1729
1730 srp->rq = rq;
1731 rq->end_io_data = srp;
64c7f1d1 1732 req->retries = SG_DEFAULT_RETRIES;
10865dfa 1733
1da177e4 1734 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1735 return 0;
10865dfa 1736
626710c9
FT		 1737 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1738 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1739 !sfp->parentdp->device->host->unchecked_isa_dma &&
2610a254 1740 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
626710c9
FT		 1741 md = NULL;
1742 else
1743 md = &map_data;
1744
1745 if (md) {
1bc0eb04
HR		 1746 mutex_lock(&sfp->f_mutex);
1747 if (dxfer_len <= rsv_schp->bufflen &&
1748 !sfp->res_in_use) {
1749 sfp->res_in_use = 1;
626710c9 1750 sg_link_reserve(sfp, srp, dxfer_len);
8d26f491
TP		 1751 } else if (hp->flags & SG_FLAG_MMAP_IO) {
1752 res = -EBUSY; /* sfp->res_in_use == 1 */
1753 if (dxfer_len > rsv_schp->bufflen)
1754 res = -ENOMEM;
1bc0eb04 1755 mutex_unlock(&sfp->f_mutex);
8d26f491 1756 return res;
1bc0eb04 1757 } else {
626710c9 1758 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1bc0eb04
HR		 1759 if (res) {
1760 mutex_unlock(&sfp->f_mutex);
626710c9 1761 return res;
1bc0eb04 1762 }
626710c9 1763 }
1bc0eb04 1764 mutex_unlock(&sfp->f_mutex);
7e56cb0f 1765
626710c9
FT		 1766 md->pages = req_schp->pages;
1767 md->page_order = req_schp->page_order;
1768 md->nr_entries = req_schp->k_use_sg;
56c451f4 1769 md->offset = 0;
97ae77a1 1770 md->null_mapped = hp->dxferp ? 0 : 1;
ecb554a8
FT		 1771 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1772 md->from_user = 1;
1773 else
1774 md->from_user = 0;
626710c9
FT		 1775 }
1776
0fdf96b6 1777 if (iov_count) {
fdc81f45 1778 struct iovec *iov = NULL;
26e49cfc 1779 struct iov_iter i;
0fdf96b6 1780
fdc81f45
AV		 1781 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
1782 if (res < 0)
1783 return res;
0fdf96b6 1784
fdc81f45 1785 iov_iter_truncate(&i, hp->dxfer_len);
137d01df
AV		 1786 if (!iov_iter_count(&i)) {
1787 kfree(iov);
1788 return -EINVAL;
1789 }
0fdf96b6 1790
26e49cfc 1791 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
0fdf96b6
FT		 1792 kfree(iov);
1793 } else
626710c9
FT		 1794 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1795 hp->dxfer_len, GFP_ATOMIC);
10db10d1
FT		 1796
1797 if (!res) {
626710c9 1798 srp->bio = rq->bio;
10db10d1 1799
626710c9
FT		 1800 if (!md) {
1801 req_schp->dio_in_use = 1;
1802 hp->info |= SG_INFO_DIRECT_IO;
1803 }
1804 }
10db10d1 1805 return res;
1da177e4
LT		 1806}
1807
cc833acb
DG		 1808static int
1809sg_finish_rem_req(Sg_request *srp)
1da177e4 1810{
e7ee4cc0
FT		 1811 int ret = 0;
1812
1da177e4
LT		 1813 Sg_fd *sfp = srp->parentfp;
1814 Sg_scatter_hold *req_schp = &srp->data;
1815
95e159d6
HR		 1816 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1817 "sg_finish_rem_req: res_used=%d\n",
1818 (int) srp->res_used));
7568615c
TB		 1819 if (srp->bio)
1820 ret = blk_rq_unmap_user(srp->bio);
10db10d1 1821
7568615c 1822 if (srp->rq) {
82ed4db4 1823 scsi_req_free_cmd(scsi_req(srp->rq));
10865dfa 1824 blk_put_request(srp->rq);
6e5a30cb 1825 }
10865dfa 1826
e27168f8
CS		 1827 if (srp->res_used)
1828 sg_unlink_reserve(sfp, srp);
1829 else
95e159d6 1830 sg_remove_scat(sfp, req_schp);
e27168f8 1831
e7ee4cc0 1832 return ret;
1da177e4
LT		 1833}
1834
1835static int
1836sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1837{
10db10d1 1838 int sg_bufflen = tablesize * sizeof(struct page *);
2d20eaf9 1839 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1840
10db10d1
FT		 1841 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1842 if (!schp->pages)
1da177e4 1843 return -ENOMEM;
1da177e4 1844 schp->sglist_len = sg_bufflen;
d6b10348 1845 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1846}
1847
1da177e4
LT		 1848static int
1849sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1850{
10db10d1 1851 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1852 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1853 int blk_size = buff_size, order;
1854 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
745dfa0d 1855 struct sg_device *sdp = sfp->parentdp;
1da177e4 1856
fb119935 1857 if (blk_size < 0)
1da177e4
LT		 1858 return -EFAULT;
1859 if (0 == blk_size)
1860 ++blk_size; /* don't know why */
b2ed6c69
FT		 1861 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1862 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
95e159d6
HR		 1863 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1864 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1865 buff_size, blk_size));
d6b10348
MC		 1866
1867 /* N.B. ret_sz carried into this block ... */
1868 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1869 if (mx_sc_elems < 0)
1870 return mx_sc_elems; /* most likely -ENOMEM */
1871
6460e75a
DG		 1872 num = scatter_elem_sz;
1873 if (unlikely(num != scatter_elem_sz_prev)) {
1874 if (num < PAGE_SIZE) {
1875 scatter_elem_sz = PAGE_SIZE;
1876 scatter_elem_sz_prev = PAGE_SIZE;
1877 } else
1878 scatter_elem_sz_prev = num;
1879 }
10db10d1 1880
745dfa0d 1881 if (sdp->device->host->unchecked_isa_dma)
10db10d1
FT		 1882 gfp_mask |= GFP_DMA;
1883
1884 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1885 gfp_mask |= __GFP_ZERO;
1886
1887 order = get_order(num);
1888retry:
1889 ret_sz = 1 << (PAGE_SHIFT + order);
1890
1891 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1892 k++, rem_sz -= ret_sz) {
1893
6460e75a 1894 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1895 scatter_elem_sz_prev : rem_sz;
1896
1897 schp->pages[k] = alloc_pages(gfp_mask, order);
1898 if (!schp->pages[k])
1899 goto out;
d6b10348 1900
6460e75a
DG		 1901 if (num == scatter_elem_sz_prev) {
1902 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1903 scatter_elem_sz = ret_sz;
1904 scatter_elem_sz_prev = ret_sz;
1905 }
1906 }
d6b10348 1907
95e159d6
HR		 1908 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1909 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1910 k, num, ret_sz));
d6b10348
MC		 1911 } /* end of for loop */
1912
10db10d1 1913 schp->page_order = order;
d6b10348 1914 schp->k_use_sg = k;
95e159d6
HR		 1915 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1916 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1917 k, rem_sz));
d6b10348
MC		 1918
1919 schp->bufflen = blk_size;
1920 if (rem_sz > 0) /* must have failed */
1921 return -ENOMEM;
1da177e4 1922 return 0;
10db10d1
FT		 1923out:
1924 for (i = 0; i < k; i++)
e71044ee 1925 __free_pages(schp->pages[i], order);
10db10d1
FT		 1926
1927 if (--order >= 0)
1928 goto retry;
1929
1930 return -ENOMEM;
1da177e4
LT		 1931}
1932
1da177e4 1933static void
95e159d6 1934sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1da177e4 1935{
95e159d6
HR		 1936 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1937 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1938 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1939 if (!schp->dio_in_use) {
1da177e4
LT		 1940 int k;
1941
10db10d1 1942 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
95e159d6
HR		 1943 SCSI_LOG_TIMEOUT(5,
1944 sg_printk(KERN_INFO, sfp->parentdp,
1945 "sg_remove_scat: k=%d, pg=0x%p\n",
1946 k, schp->pages[k]));
10db10d1 1947 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1948 }
6e5a30cb 1949
10db10d1 1950 kfree(schp->pages);
1da177e4 1951 }
d6b10348 1952 }
1da177e4
LT		 1953 memset(schp, 0, sizeof (*schp));
1954}
1955
1da177e4
LT		 1956static int
1957sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1958{
1959 Sg_scatter_hold *schp = &srp->data;
d6b10348 1960 int k, num;
1da177e4 1961
95e159d6
HR		 1962 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1963 "sg_read_oxfer: num_read_xfer=%d\n",
1964 num_read_xfer));
1da177e4
LT		 1965 if ((!outp) || (num_read_xfer <= 0))
1966 return 0;
d6b10348 1967
10db10d1
FT		 1968 num = 1 << (PAGE_SHIFT + schp->page_order);
1969 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1970 if (num > num_read_xfer) {
10db10d1 1971 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1972 num_read_xfer))
1973 return -EFAULT;
1974 break;
1975 } else {
10db10d1 1976 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1977 num))
1978 return -EFAULT;
1979 num_read_xfer -= num;
1980 if (num_read_xfer <= 0)
1da177e4 1981 break;
d6b10348 1982 outp += num;
1da177e4 1983 }
1da177e4 1984 }
d6b10348 1985
1da177e4
LT		 1986 return 0;
1987}
1988
1989static void
1990sg_build_reserve(Sg_fd * sfp, int req_size)
1991{
1992 Sg_scatter_hold *schp = &sfp->reserve;
1993
95e159d6
HR		 1994 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1995 "sg_build_reserve: req_size=%d\n", req_size));
1da177e4
LT		 1996 do {
1997 if (req_size < PAGE_SIZE)
1998 req_size = PAGE_SIZE;
1999 if (0 == sg_build_indirect(schp, sfp, req_size))
2000 return;
2001 else
95e159d6 2002 sg_remove_scat(sfp, schp);
1da177e4
LT		 2003 req_size >>= 1; /* divide by 2 */
2004 } while (req_size > (PAGE_SIZE / 2));
2005}
2006
2007static void
2008sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2009{
2010 Sg_scatter_hold *req_schp = &srp->data;
2011 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 2012 int k, num, rem;
1da177e4
LT		 2013
2014 srp->res_used = 1;
95e159d6
HR		 2015 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
2016 "sg_link_reserve: size=%d\n", size));
eca7be5e 2017 rem = size;
d6b10348 2018
10db10d1
FT		 2019 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
2020 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 2021 if (rem <= num) {
d6b10348
MC		 2022 req_schp->k_use_sg = k + 1;
2023 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 2024 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 2025
2026 req_schp->bufflen = size;
10db10d1 2027 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 2028 break;
2029 } else
2030 rem -= num;
1da177e4 2031 }
d6b10348
MC		 2032
2033 if (k >= rsv_schp->k_use_sg)
95e159d6
HR		 2034 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2035 "sg_link_reserve: BAD size\n"));
1da177e4
LT		 2036}
2037
2038static void
2039sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2040{
2041 Sg_scatter_hold *req_schp = &srp->data;
1da177e4 2042
95e159d6
HR		 2043 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2044 "sg_unlink_reserve: req->k_use_sg=%d\n",
2045 (int) req_schp->k_use_sg));
1da177e4
LT		 2046 req_schp->k_use_sg = 0;
2047 req_schp->bufflen = 0;
10db10d1
FT		 2048 req_schp->pages = NULL;
2049 req_schp->page_order = 0;
1da177e4 2050 req_schp->sglist_len = 0;
1da177e4 2051 srp->res_used = 0;
e791ce27
HR		 2052 /* Called without mutex lock to avoid deadlock */
2053 sfp->res_in_use = 0;
1da177e4
LT		 2054}
2055
2056static Sg_request *
2057sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2058{
2059 Sg_request *resp;
2060 unsigned long iflags;
2061
2062 write_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9 2063 list_for_each_entry(resp, &sfp->rq_list, entry) {
1da177e4
LT		 2064 /* look for requests that are ready + not SG_IO owned */
2065 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2066 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2067 resp->done = 2; /* guard against other readers */
48ae8484
JT		 2068 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2069 return resp;
1da177e4
LT		 2070 }
2071 }
2072 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
48ae8484 2073 return NULL;
1da177e4
LT		 2074}
2075
1da177e4
LT		 2076/* always adds to end of list */
2077static Sg_request *
2078sg_add_request(Sg_fd * sfp)
2079{
2080 int k;
2081 unsigned long iflags;
1da177e4
LT		 2082 Sg_request *rp = sfp->req_arr;
2083
2084 write_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9
HR		 2085 if (!list_empty(&sfp->rq_list)) {
2086 if (!sfp->cmd_q)
2087 goto out_unlock;
2088
2089 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2090 if (!rp->parentfp)
2091 break;
1da177e4 2092 }
109bade9
HR		 2093 if (k >= SG_MAX_QUEUE)
2094 goto out_unlock;
1da177e4 2095 }
109bade9
HR		 2096 memset(rp, 0, sizeof (Sg_request));
2097 rp->parentfp = sfp;
2098 rp->header.duration = jiffies_to_msecs(jiffies);
2099 list_add_tail(&rp->entry, &sfp->rq_list);
1da177e4 2100 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
109bade9
HR		 2101 return rp;
2102out_unlock:
2103 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2104 return NULL;
1da177e4
LT		 2105}
2106
2107/* Return of 1 for found; 0 for not found */
2108static int
2109sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2110{
1da177e4
LT		 2111 unsigned long iflags;
2112 int res = 0;
2113
109bade9 2114 if (!sfp || !srp || list_empty(&sfp->rq_list))
1da177e4
LT		 2115 return res;
2116 write_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9
HR		 2117 if (!list_empty(&srp->entry)) {
2118 list_del(&srp->entry);
2119 srp->parentfp = NULL;
1da177e4 2120 res = 1;
1da177e4
LT		 2121 }
2122 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2123 return res;
2124}
2125
1da177e4 2126static Sg_fd *
95e159d6 2127sg_add_sfp(Sg_device * sdp)
1da177e4
LT		 2128{
2129 Sg_fd *sfp;
2130 unsigned long iflags;
44ec9542 2131 int bufflen;
1da177e4 2132
d6b10348 2133 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4 2134 if (!sfp)
cc833acb 2135 return ERR_PTR(-ENOMEM);
d6b10348 2136
1da177e4
LT		 2137 init_waitqueue_head(&sfp->read_wait);
2138 rwlock_init(&sfp->rq_list_lock);
109bade9 2139 INIT_LIST_HEAD(&sfp->rq_list);
c6517b79 2140 kref_init(&sfp->f_ref);
1bc0eb04 2141 mutex_init(&sfp->f_mutex);
1da177e4
LT		 2142 sfp->timeout = SG_DEFAULT_TIMEOUT;
2143 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2144 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
1da177e4
LT		 2145 sfp->cmd_q = SG_DEF_COMMAND_Q;
2146 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2147 sfp->parentdp = sdp;
cc833acb
DG		 2148 write_lock_irqsave(&sdp->sfd_lock, iflags);
2149 if (atomic_read(&sdp->detaching)) {
2150 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2151 return ERR_PTR(-ENODEV);
2152 }
3442f802 2153 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
cc833acb 2154 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
95e159d6
HR		 2155 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2156 "sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2157 if (unlikely(sg_big_buff != def_reserved_size))
2158 sg_big_buff = def_reserved_size;
2159
44ec9542 2160 bufflen = min_t(int, sg_big_buff,
46f69e6a 2161 max_sectors_bytes(sdp->device->request_queue));
44ec9542 2162 sg_build_reserve(sfp, bufflen);
95e159d6
HR		 2163 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2164 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2165 sfp->reserve.bufflen,
2166 sfp->reserve.k_use_sg));
c6517b79
TB		 2167
2168 kref_get(&sdp->d_ref);
2169 __module_get(THIS_MODULE);
1da177e4
LT		 2170 return sfp;
2171}
2172
cc833acb
DG		 2173static void
2174sg_remove_sfp_usercontext(struct work_struct *work)
1da177e4 2175{
c6517b79
TB		 2176 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2177 struct sg_device *sdp = sfp->parentdp;
109bade9 2178 Sg_request *srp;
97d27b0d 2179 unsigned long iflags;
c6517b79
TB		 2180
2181 /* Cleanup any responses which were never read(). */
97d27b0d 2182 write_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9
HR		 2183 while (!list_empty(&sfp->rq_list)) {
2184 srp = list_first_entry(&sfp->rq_list, Sg_request, entry);
2185 sg_finish_rem_req(srp);
97d27b0d
HR		 2186 list_del(&srp->entry);
2187 srp->parentfp = NULL;
109bade9 2188 }
97d27b0d 2189 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1da177e4 2190
1da177e4 2191 if (sfp->reserve.bufflen > 0) {
95e159d6
HR		 2192 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2193 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
c6517b79
TB		 2194 (int) sfp->reserve.bufflen,
2195 (int) sfp->reserve.k_use_sg));
95e159d6 2196 sg_remove_scat(sfp, &sfp->reserve);
1da177e4 2197 }
c6517b79 2198
95e159d6
HR		 2199 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2200 "sg_remove_sfp: sfp=0x%p\n", sfp));
d6b10348 2201 kfree(sfp);
c6517b79
TB		 2202
2203 scsi_device_put(sdp->device);
cc833acb 2204 kref_put(&sdp->d_ref, sg_device_destroy);
c6517b79 2205 module_put(THIS_MODULE);
1da177e4
LT		 2206}
2207
cc833acb
DG		 2208static void
2209sg_remove_sfp(struct kref *kref)
1da177e4 2210{
c6517b79 2211 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
065b4a2f 2212 struct sg_device *sdp = sfp->parentdp;
c6517b79 2213 unsigned long iflags;
1da177e4 2214
cc833acb 2215 write_lock_irqsave(&sdp->sfd_lock, iflags);
3442f802 2216 list_del(&sfp->sfd_siblings);
cc833acb 2217 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
1da177e4 2218
015640ed
FT		 2219 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2220 schedule_work(&sfp->ew.work);
1da177e4
LT		 2221}
2222
1da177e4 2223#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2224static int
2225sg_idr_max_id(int id, void *p, void *data)
2226{
2227 int *k = data;
2228
2229 if (*k < id)
2230 *k = id;
2231
2232 return 0;
2233}
2234
1da177e4
LT		 2235static int
2236sg_last_dev(void)
2237{
53474c04 2238 int k = -1;
1da177e4
LT		 2239 unsigned long iflags;
2240
7c07d613
JB		 2241 read_lock_irqsave(&sg_index_lock, iflags);
2242 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2243 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2244 return k + 1; /* origin 1 */
2245}
2246#endif
2247
c6517b79
TB		 2248/* must be called with sg_index_lock held */
2249static Sg_device *sg_lookup_dev(int dev)
1da177e4 2250{
c6517b79
TB		 2251 return idr_find(&sg_index_idr, dev);
2252}
1da177e4 2253
cc833acb
DG		 2254static Sg_device *
2255sg_get_dev(int dev)
c6517b79
TB		 2256{
2257 struct sg_device *sdp;
2258 unsigned long flags;
2259
2260 read_lock_irqsave(&sg_index_lock, flags);
2261 sdp = sg_lookup_dev(dev);
2262 if (!sdp)
2263 sdp = ERR_PTR(-ENXIO);
cc833acb
DG		 2264 else if (atomic_read(&sdp->detaching)) {
2265 /* If sdp->detaching, then the refcount may already be 0, in
c6517b79
TB		 2266 * which case it would be a bug to do kref_get().
2267 */
2268 sdp = ERR_PTR(-ENODEV);
2269 } else
2270 kref_get(&sdp->d_ref);
2271 read_unlock_irqrestore(&sg_index_lock, flags);
7c07d613 2272
1da177e4
LT		 2273 return sdp;
2274}
2275
2276#ifdef CONFIG_SCSI_PROC_FS
2277
2278static struct proc_dir_entry *sg_proc_sgp = NULL;
2279
2280static char sg_proc_sg_dirname[] = "scsi/sg";
2281
2282static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2283
2284static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2285static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2286 size_t count, loff_t *off);
828c0950
AD		 2287static const struct file_operations adio_fops = {
2288 .owner = THIS_MODULE,
1da177e4 2289 .open = sg_proc_single_open_adio,
828c0950
AD		 2290 .read = seq_read,
2291 .llseek = seq_lseek,
1da177e4
LT		 2292 .write = sg_proc_write_adio,
2293 .release = single_release,
2294};
2295
2296static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2297static ssize_t sg_proc_write_dressz(struct file *filp,
2298 const char __user *buffer, size_t count, loff_t *off);
828c0950
AD		 2299static const struct file_operations dressz_fops = {
2300 .owner = THIS_MODULE,
1da177e4 2301 .open = sg_proc_single_open_dressz,
828c0950
AD		 2302 .read = seq_read,
2303 .llseek = seq_lseek,
1da177e4
LT		 2304 .write = sg_proc_write_dressz,
2305 .release = single_release,
2306};
2307
2308static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2309static int sg_proc_single_open_version(struct inode *inode, struct file *file);
828c0950
AD		 2310static const struct file_operations version_fops = {
2311 .owner = THIS_MODULE,
1da177e4 2312 .open = sg_proc_single_open_version,
828c0950
AD		 2313 .read = seq_read,
2314 .llseek = seq_lseek,
1da177e4
LT		 2315 .release = single_release,
2316};
2317
2318static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2319static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
828c0950
AD		 2320static const struct file_operations devhdr_fops = {
2321 .owner = THIS_MODULE,
1da177e4 2322 .open = sg_proc_single_open_devhdr,
828c0950
AD		 2323 .read = seq_read,
2324 .llseek = seq_lseek,
1da177e4
LT		 2325 .release = single_release,
2326};
2327
2328static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2329static int sg_proc_open_dev(struct inode *inode, struct file *file);
2330static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2331static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2332static void dev_seq_stop(struct seq_file *s, void *v);
828c0950
AD		 2333static const struct file_operations dev_fops = {
2334 .owner = THIS_MODULE,
1da177e4 2335 .open = sg_proc_open_dev,
828c0950
AD		 2336 .read = seq_read,
2337 .llseek = seq_lseek,
1da177e4
LT		 2338 .release = seq_release,
2339};
88e9d34c 2340static const struct seq_operations dev_seq_ops = {
1da177e4
LT		 2341 .start = dev_seq_start,
2342 .next = dev_seq_next,
2343 .stop = dev_seq_stop,
2344 .show = sg_proc_seq_show_dev,
2345};
2346
2347static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2348static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
828c0950
AD		 2349static const struct file_operations devstrs_fops = {
2350 .owner = THIS_MODULE,
1da177e4 2351 .open = sg_proc_open_devstrs,
828c0950
AD		 2352 .read = seq_read,
2353 .llseek = seq_lseek,
1da177e4
LT		 2354 .release = seq_release,
2355};
88e9d34c 2356static const struct seq_operations devstrs_seq_ops = {
1da177e4
LT		 2357 .start = dev_seq_start,
2358 .next = dev_seq_next,
2359 .stop = dev_seq_stop,
2360 .show = sg_proc_seq_show_devstrs,
2361};
2362
2363static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2364static int sg_proc_open_debug(struct inode *inode, struct file *file);
828c0950
AD		 2365static const struct file_operations debug_fops = {
2366 .owner = THIS_MODULE,
1da177e4 2367 .open = sg_proc_open_debug,
828c0950
AD		 2368 .read = seq_read,
2369 .llseek = seq_lseek,
1da177e4
LT		 2370 .release = seq_release,
2371};
88e9d34c 2372static const struct seq_operations debug_seq_ops = {
1da177e4
LT		 2373 .start = dev_seq_start,
2374 .next = dev_seq_next,
2375 .stop = dev_seq_stop,
2376 .show = sg_proc_seq_show_debug,
2377};
2378
2379
2380struct sg_proc_leaf {
2381 const char * name;
828c0950 2382 const struct file_operations * fops;
1da177e4
LT		 2383};
2384
18b8ba6c 2385static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
1da177e4
LT		 2386 {"allow_dio", &adio_fops},
2387 {"debug", &debug_fops},
2388 {"def_reserved_size", &dressz_fops},
2389 {"device_hdr", &devhdr_fops},
2390 {"devices", &dev_fops},
2391 {"device_strs", &devstrs_fops},
2392 {"version", &version_fops}
2393};
2394
2395static int
2396sg_proc_init(void)
2397{
6391a113 2398 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
d161a13f 2399 int k;
1da177e4 2400
66600221 2401 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2402 if (!sg_proc_sgp)
2403 return 1;
2404 for (k = 0; k < num_leaves; ++k) {
18b8ba6c 2405 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
d161a13f 2406 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f 2407 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2408 }
2409 return 0;
2410}
2411
2412static void
2413sg_proc_cleanup(void)
2414{
2415 int k;
6391a113 2416 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2417
2418 if (!sg_proc_sgp)
2419 return;
2420 for (k = 0; k < num_leaves; ++k)
2421 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2422 remove_proc_entry(sg_proc_sg_dirname, NULL);
2423}
2424
2425
2426static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2427{
2428 seq_printf(s, "%d\n", *((int *)s->private));
2429 return 0;
2430}
2431
2432static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2433{
2434 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2435}
2436
2437static ssize_t
2438sg_proc_write_adio(struct file *filp, const char __user *buffer,
2439 size_t count, loff_t *off)
2440{
7e95fffe
SB		 2441 int err;
2442 unsigned long num;
1da177e4
LT		 2443
2444 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2445 return -EACCES;
7e95fffe
SB		 2446 err = kstrtoul_from_user(buffer, count, 0, &num);
2447 if (err)
2448 return err;
2449 sg_allow_dio = num ? 1 : 0;
1da177e4
LT		 2450 return count;
2451}
2452
2453static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2454{
2455 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2456}
2457
2458static ssize_t
2459sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2460 size_t count, loff_t *off)
2461{
7e95fffe 2462 int err;
1da177e4 2463 unsigned long k = ULONG_MAX;
1da177e4
LT		 2464
2465 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2466 return -EACCES;
7e95fffe
SB		 2467
2468 err = kstrtoul_from_user(buffer, count, 0, &k);
2469 if (err)
2470 return err;
1da177e4
LT		 2471 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2472 sg_big_buff = k;
2473 return count;
2474 }
2475 return -ERANGE;
2476}
2477
2478static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2479{
2480 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2481 sg_version_date);
2482 return 0;
2483}
2484
2485static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2486{
2487 return single_open(file, sg_proc_seq_show_version, NULL);
2488}
2489
2490static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2491{
cc833acb 2492 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
1da177e4
LT		 2493 return 0;
2494}
2495
2496static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2497{
2498 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2499}
2500
2501struct sg_proc_deviter {
2502 loff_t index;
2503 size_t max;
2504};
2505
2506static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2507{
2508 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2509
729d70f5 2510 s->private = it;
1da177e4
LT		 2511 if (! it)
2512 return NULL;
729d70f5 2513
1da177e4
LT		 2514 it->index = *pos;
2515 it->max = sg_last_dev();
2516 if (it->index >= it->max)
729d70f5 2517 return NULL;
1da177e4 2518 return it;
1da177e4
LT		 2519}
2520
2521static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2522{
729d70f5 2523 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2524
2525 *pos = ++it->index;
2526 return (it->index < it->max) ? it : NULL;
2527}
2528
2529static void dev_seq_stop(struct seq_file *s, void *v)
2530{
729d70f5 2531 kfree(s->private);
1da177e4
LT		 2532}
2533
2534static int sg_proc_open_dev(struct inode *inode, struct file *file)
2535{
2536 return seq_open(file, &dev_seq_ops);
2537}
2538
2539static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2540{
2541 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2542 Sg_device *sdp;
2543 struct scsi_device *scsidp;
c6517b79 2544 unsigned long iflags;
1da177e4 2545
c6517b79
TB		 2546 read_lock_irqsave(&sg_index_lock, iflags);
2547 sdp = it ? sg_lookup_dev(it->index) : NULL;
cc833acb
DG		 2548 if ((NULL == sdp) || (NULL == sdp->device) ||
2549 (atomic_read(&sdp->detaching)))
2550 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2551 else {
2552 scsidp = sdp->device;
9cb78c16 2553 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
1da177e4
LT		 2554 scsidp->host->host_no, scsidp->channel,
2555 scsidp->id, scsidp->lun, (int) scsidp->type,
2556 1,
2557 (int) scsidp->queue_depth,
71e75c97 2558 (int) atomic_read(&scsidp->device_busy),
1da177e4 2559 (int) scsi_device_online(scsidp));
cc833acb 2560 }
c6517b79 2561 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2562 return 0;
2563}
2564
2565static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2566{
2567 return seq_open(file, &devstrs_seq_ops);
2568}
2569
2570static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2571{
2572 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2573 Sg_device *sdp;
2574 struct scsi_device *scsidp;
c6517b79 2575 unsigned long iflags;
1da177e4 2576
c6517b79
TB		 2577 read_lock_irqsave(&sg_index_lock, iflags);
2578 sdp = it ? sg_lookup_dev(it->index) : NULL;
cc833acb
DG		 2579 scsidp = sdp ? sdp->device : NULL;
2580 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
1da177e4
LT		 2581 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2582 scsidp->vendor, scsidp->model, scsidp->rev);
2583 else
cc833acb 2584 seq_puts(s, "<no active device>\n");
c6517b79 2585 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2586 return 0;
2587}
2588
c0d3b9c2 2589/* must be called while holding sg_index_lock */
1da177e4
LT		 2590static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2591{
109bade9 2592 int k, new_interface, blen, usg;
1da177e4
LT		 2593 Sg_request *srp;
2594 Sg_fd *fp;
2595 const sg_io_hdr_t *hp;
2596 const char * cp;
cb59e840 2597 unsigned int ms;
1da177e4 2598
3442f802
FT		 2599 k = 0;
2600 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2601 k++;
c6517b79 2602 read_lock(&fp->rq_list_lock); /* irqs already disabled */
1da177e4 2603 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3442f802 2604 "(res)sgat=%d low_dma=%d\n", k,
1da177e4
LT		 2605 jiffies_to_msecs(fp->timeout),
2606 fp->reserve.bufflen,
2607 (int) fp->reserve.k_use_sg,
745dfa0d 2608 (int) sdp->device->host->unchecked_isa_dma);
ebaf466b 2609 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
1da177e4 2610 (int) fp->cmd_q, (int) fp->force_packid,
ebaf466b 2611 (int) fp->keep_orphan);
109bade9 2612 list_for_each_entry(srp, &fp->rq_list, entry) {
1da177e4
LT		 2613 hp = &srp->header;
2614 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2615 if (srp->res_used) {
109bade9 2616 if (new_interface &&
1da177e4
LT		 2617 (SG_FLAG_MMAP_IO & hp->flags))
2618 cp = " mmap>> ";
2619 else
2620 cp = " rb>> ";
2621 } else {
2622 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2623 cp = " dio>> ";
2624 else
2625 cp = " ";
2626 }
cc833acb 2627 seq_puts(s, cp);
d6b10348
MC		 2628 blen = srp->data.bufflen;
2629 usg = srp->data.k_use_sg;
cc833acb
DG		 2630 seq_puts(s, srp->done ?
2631 ((1 == srp->done) ? "rcv:" : "fin:")
2632 : "act:");
1da177e4
LT		 2633 seq_printf(s, " id=%d blen=%d",
2634 srp->header.pack_id, blen);
2635 if (srp->done)
2636 seq_printf(s, " dur=%d", hp->duration);
cb59e840 2637 else {
2638 ms = jiffies_to_msecs(jiffies);
1da177e4 2639 seq_printf(s, " t_o/elap=%d/%d",
cb59e840 2640 (new_interface ? hp->timeout :
2641 jiffies_to_msecs(fp->timeout)),
2642 (ms > hp->duration ? ms - hp->duration : 0));
2643 }
1da177e4
LT		 2644 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2645 (int) srp->data.cmd_opcode);
2646 }
109bade9 2647 if (list_empty(&fp->rq_list))
cc833acb 2648 seq_puts(s, " No requests active\n");
c6517b79 2649 read_unlock(&fp->rq_list_lock);
1da177e4
LT		 2650 }
2651}
2652
2653static int sg_proc_open_debug(struct inode *inode, struct file *file)
2654{
2655 return seq_open(file, &debug_seq_ops);
2656}
2657
2658static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2659{
2660 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2661 Sg_device *sdp;
c6517b79 2662 unsigned long iflags;
1da177e4 2663
cc833acb
DG		 2664 if (it && (0 == it->index))
2665 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2666 (int)it->max, sg_big_buff);
1da177e4 2667
c6517b79
TB		 2668 read_lock_irqsave(&sg_index_lock, iflags);
2669 sdp = it ? sg_lookup_dev(it->index) : NULL;
cc833acb
DG		 2670 if (NULL == sdp)
2671 goto skip;
2672 read_lock(&sdp->sfd_lock);
2673 if (!list_empty(&sdp->sfds)) {
c0d3b9c2 2674 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
cc833acb
DG		 2675 if (atomic_read(&sdp->detaching))
2676 seq_puts(s, "detaching pending close ");
2677 else if (sdp->device) {
2678 struct scsi_device *scsidp = sdp->device;
2679
9cb78c16 2680 seq_printf(s, "%d:%d:%d:%llu em=%d",
cc833acb
DG		 2681 scsidp->host->host_no,
2682 scsidp->channel, scsidp->id,
2683 scsidp->lun,
2684 scsidp->host->hostt->emulated);
2685 }
2686 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2687 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
c0d3b9c2 2688 sg_proc_debug_helper(s, sdp);
1da177e4 2689 }
cc833acb
DG		 2690 read_unlock(&sdp->sfd_lock);
2691skip:
c6517b79 2692 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2693 return 0;
2694}
2695
2696#endif /* CONFIG_SCSI_PROC_FS */
2697
2698module_init(init_sg);
2699module_exit(exit_sg);
Linux 6.x block layer and io_uring tree(s)