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Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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
018e0446 220 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
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
37b9d1e0 831static long
f4927c45 832sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 833{
834 void __user *p = (void __user *)arg;
835 int __user *ip = p;
176aa9d6 836 int result, val, read_only;
1da177e4
LT		 837 Sg_device *sdp;
838 Sg_fd *sfp;
839 Sg_request *srp;
840 unsigned long iflags;
841
842 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
843 return -ENXIO;
abf54393 844
95e159d6
HR		 845 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
846 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
1da177e4
LT		 847 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
848
849 switch (cmd_in) {
850 case SG_IO:
cc833acb 851 if (atomic_read(&sdp->detaching))
dddbf8d9
JE		 852 return -ENODEV;
853 if (!scsi_block_when_processing_errors(sdp->device))
854 return -ENXIO;
855 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
856 return -EFAULT;
857 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
858 1, read_only, 1, &srp);
859 if (result < 0)
860 return result;
3f0c6aba 861 result = wait_event_interruptible(sfp->read_wait,
cc833acb
DG		 862 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
863 if (atomic_read(&sdp->detaching))
794c10fa
JE		 864 return -ENODEV;
865 write_lock_irq(&sfp->rq_list_lock);
866 if (srp->done) {
867 srp->done = 2;
dddbf8d9 868 write_unlock_irq(&sfp->rq_list_lock);
794c10fa
JE		 869 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
870 return (result < 0) ? result : 0;
1da177e4 871 }
794c10fa
JE		 872 srp->orphan = 1;
873 write_unlock_irq(&sfp->rq_list_lock);
874 return result; /* -ERESTARTSYS because signal hit process */
1da177e4
LT		 875 case SG_SET_TIMEOUT:
876 result = get_user(val, ip);
877 if (result)
878 return result;
879 if (val < 0)
880 return -EIO;
f8630bd7
PB		 881 if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ))
882 val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ),
b9b6e80a 883 INT_MAX);
1da177e4 884 sfp->timeout_user = val;
f8630bd7 885 sfp->timeout = mult_frac(val, HZ, USER_HZ);
1da177e4
LT		 886
887 return 0;
888 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
889 /* strange ..., for backward compatibility */
890 return sfp->timeout_user;
891 case SG_SET_FORCE_LOW_DMA:
745dfa0d
HR		 892 /*
893 * N.B. This ioctl never worked properly, but failed to
894 * return an error value. So returning '0' to keep compability
895 * with legacy applications.
896 */
1da177e4
LT		 897 return 0;
898 case SG_GET_LOW_DMA:
745dfa0d 899 return put_user((int) sdp->device->host->unchecked_isa_dma, ip);
1da177e4
LT		 900 case SG_GET_SCSI_ID:
901 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
902 return -EFAULT;
903 else {
904 sg_scsi_id_t __user *sg_idp = p;
905
cc833acb 906 if (atomic_read(&sdp->detaching))
1da177e4
LT		 907 return -ENODEV;
908 __put_user((int) sdp->device->host->host_no,
909 &sg_idp->host_no);
910 __put_user((int) sdp->device->channel,
911 &sg_idp->channel);
912 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
913 __put_user((int) sdp->device->lun, &sg_idp->lun);
914 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
915 __put_user((short) sdp->device->host->cmd_per_lun,
916 &sg_idp->h_cmd_per_lun);
917 __put_user((short) sdp->device->queue_depth,
918 &sg_idp->d_queue_depth);
919 __put_user(0, &sg_idp->unused[0]);
920 __put_user(0, &sg_idp->unused[1]);
921 return 0;
922 }
923 case SG_SET_FORCE_PACK_ID:
924 result = get_user(val, ip);
925 if (result)
926 return result;
927 sfp->force_packid = val ? 1 : 0;
928 return 0;
929 case SG_GET_PACK_ID:
930 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
931 return -EFAULT;
932 read_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9 933 list_for_each_entry(srp, &sfp->rq_list, entry) {
1da177e4
LT		 934 if ((1 == srp->done) && (!srp->sg_io_owned)) {
935 read_unlock_irqrestore(&sfp->rq_list_lock,
936 iflags);
937 __put_user(srp->header.pack_id, ip);
938 return 0;
939 }
940 }
941 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
942 __put_user(-1, ip);
943 return 0;
944 case SG_GET_NUM_WAITING:
945 read_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9
HR		 946 val = 0;
947 list_for_each_entry(srp, &sfp->rq_list, entry) {
1da177e4
LT		 948 if ((1 == srp->done) && (!srp->sg_io_owned))
949 ++val;
950 }
951 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
952 return put_user(val, ip);
953 case SG_GET_SG_TABLESIZE:
954 return put_user(sdp->sg_tablesize, ip);
955 case SG_SET_RESERVED_SIZE:
956 result = get_user(val, ip);
957 if (result)
958 return result;
959 if (val < 0)
960 return -EINVAL;
44ec9542 961 val = min_t(int, val,
46f69e6a 962 max_sectors_bytes(sdp->device->request_queue));
1bc0eb04 963 mutex_lock(&sfp->f_mutex);
1da177e4 964 if (val != sfp->reserve.bufflen) {
1bc0eb04
HR		 965 if (sfp->mmap_called ||
966 sfp->res_in_use) {
967 mutex_unlock(&sfp->f_mutex);
1da177e4 968 return -EBUSY;
1bc0eb04
HR		 969 }
970
95e159d6 971 sg_remove_scat(sfp, &sfp->reserve);
1da177e4
LT		 972 sg_build_reserve(sfp, val);
973 }
1bc0eb04 974 mutex_unlock(&sfp->f_mutex);
1da177e4
LT		 975 return 0;
976 case SG_GET_RESERVED_SIZE:
44ec9542 977 val = min_t(int, sfp->reserve.bufflen,
46f69e6a 978 max_sectors_bytes(sdp->device->request_queue));
1da177e4
LT		 979 return put_user(val, ip);
980 case SG_SET_COMMAND_Q:
981 result = get_user(val, ip);
982 if (result)
983 return result;
984 sfp->cmd_q = val ? 1 : 0;
985 return 0;
986 case SG_GET_COMMAND_Q:
987 return put_user((int) sfp->cmd_q, ip);
988 case SG_SET_KEEP_ORPHAN:
989 result = get_user(val, ip);
990 if (result)
991 return result;
992 sfp->keep_orphan = val;
993 return 0;
994 case SG_GET_KEEP_ORPHAN:
995 return put_user((int) sfp->keep_orphan, ip);
996 case SG_NEXT_CMD_LEN:
997 result = get_user(val, ip);
998 if (result)
999 return result;
bf33f87d 1000 if (val > SG_MAX_CDB_SIZE)
1001 return -ENOMEM;
1da177e4
LT		 1002 sfp->next_cmd_len = (val > 0) ? val : 0;
1003 return 0;
1004 case SG_GET_VERSION_NUM:
1005 return put_user(sg_version_num, ip);
1006 case SG_GET_ACCESS_COUNT:
1007 /* faked - we don't have a real access count anymore */
1008 val = (sdp->device ? 1 : 0);
1009 return put_user(val, ip);
1010 case SG_GET_REQUEST_TABLE:
1011 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1012 return -EFAULT;
1013 else {
cb59e840 1014 sg_req_info_t *rinfo;
1015 unsigned int ms;
1016
1017 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1018 GFP_KERNEL);
1019 if (!rinfo)
1020 return -ENOMEM;
1da177e4 1021 read_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9
HR		 1022 val = 0;
1023 list_for_each_entry(srp, &sfp->rq_list, entry) {
bd46fc40 1024 if (val >= SG_MAX_QUEUE)
109bade9 1025 break;
1da177e4 1026 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
109bade9
HR		 1027 rinfo[val].req_state = srp->done + 1;
1028 rinfo[val].problem =
1029 srp->header.masked_status &
1030 srp->header.host_status &
1031 srp->header.driver_status;
1032 if (srp->done)
1033 rinfo[val].duration =
1034 srp->header.duration;
1035 else {
1036 ms = jiffies_to_msecs(jiffies);
1037 rinfo[val].duration =
1038 (ms > srp->header.duration) ?
1039 (ms - srp->header.duration) : 0;
1da177e4 1040 }
109bade9
HR		 1041 rinfo[val].orphan = srp->orphan;
1042 rinfo[val].sg_io_owned = srp->sg_io_owned;
1043 rinfo[val].pack_id = srp->header.pack_id;
1044 rinfo[val].usr_ptr = srp->header.usr_ptr;
1045 val++;
1da177e4
LT		 1046 }
1047 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
109bade9 1048 result = __copy_to_user(p, rinfo,
cb59e840 1049 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1050 result = result ? -EFAULT : 0;
1051 kfree(rinfo);
1052 return result;
1da177e4
LT		 1053 }
1054 case SG_EMULATED_HOST:
cc833acb 1055 if (atomic_read(&sdp->detaching))
1da177e4
LT		 1056 return -ENODEV;
1057 return put_user(sdp->device->host->hostt->emulated, ip);
1da177e4 1058 case SCSI_IOCTL_SEND_COMMAND:
cc833acb 1059 if (atomic_read(&sdp->detaching))
1da177e4
LT		 1060 return -ENODEV;
1061 if (read_only) {
1062 unsigned char opcode = WRITE_6;
1063 Scsi_Ioctl_Command __user *siocp = p;
1064
1065 if (copy_from_user(&opcode, siocp->data, 1))
1066 return -EFAULT;
14e507b8 1067 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1068 return -EPERM;
1069 }
e915e872 1070 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1da177e4
LT		 1071 case SG_SET_DEBUG:
1072 result = get_user(val, ip);
1073 if (result)
1074 return result;
1075 sdp->sgdebug = (char) val;
1076 return 0;
44ec9542 1077 case BLKSECTGET:
46f69e6a 1078 return put_user(max_sectors_bytes(sdp->device->request_queue),
44ec9542 1079 ip);
6da127ad
CS		 1080 case BLKTRACESETUP:
1081 return blk_trace_setup(sdp->device->request_queue,
1082 sdp->disk->disk_name,
76e3a19d 1083 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
7475c8ae 1084 NULL, p);
6da127ad
CS		 1085 case BLKTRACESTART:
1086 return blk_trace_startstop(sdp->device->request_queue, 1);
1087 case BLKTRACESTOP:
1088 return blk_trace_startstop(sdp->device->request_queue, 0);
1089 case BLKTRACETEARDOWN:
1090 return blk_trace_remove(sdp->device->request_queue);
906d15fb
CH		 1091 case SCSI_IOCTL_GET_IDLUN:
1092 case SCSI_IOCTL_GET_BUS_NUMBER:
1093 case SCSI_IOCTL_PROBE_HOST:
1094 case SG_GET_TRANSFORM:
1095 case SG_SCSI_RESET:
1096 if (atomic_read(&sdp->detaching))
1097 return -ENODEV;
1098 break;
1da177e4
LT		 1099 default:
1100 if (read_only)
1101 return -EPERM; /* don't know so take safe approach */
906d15fb 1102 break;
1da177e4 1103 }
906d15fb
CH		 1104
1105 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1106 cmd_in, filp->f_flags & O_NDELAY);
1107 if (result)
1108 return result;
1109 return scsi_ioctl(sdp->device, cmd_in, p);
1da177e4
LT		 1110}
1111
1112#ifdef CONFIG_COMPAT
1113static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1114{
1115 Sg_device *sdp;
1116 Sg_fd *sfp;
1117 struct scsi_device *sdev;
1118
1119 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1120 return -ENXIO;
1121
1122 sdev = sdp->device;
1123 if (sdev->host->hostt->compat_ioctl) {
1124 int ret;
1125
1126 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1127
1128 return ret;
1129 }
1130
1131 return -ENOIOCTLCMD;
1132}
1133#endif
1134
1135static unsigned int
1136sg_poll(struct file *filp, poll_table * wait)
1137{
1138 unsigned int res = 0;
1139 Sg_device *sdp;
1140 Sg_fd *sfp;
1141 Sg_request *srp;
1142 int count = 0;
1143 unsigned long iflags;
1144
ebaf466b
JE		 1145 sfp = filp->private_data;
1146 if (!sfp)
1147 return POLLERR;
1148 sdp = sfp->parentdp;
1149 if (!sdp)
1da177e4
LT		 1150 return POLLERR;
1151 poll_wait(filp, &sfp->read_wait, wait);
1152 read_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9 1153 list_for_each_entry(srp, &sfp->rq_list, entry) {
1da177e4
LT		 1154 /* if any read waiting, flag it */
1155 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1156 res = POLLIN | POLLRDNORM;
1157 ++count;
1158 }
1159 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1160
cc833acb 1161 if (atomic_read(&sdp->detaching))
1da177e4
LT		 1162 res |= POLLHUP;
1163 else if (!sfp->cmd_q) {
1164 if (0 == count)
1165 res |= POLLOUT | POLLWRNORM;
1166 } else if (count < SG_MAX_QUEUE)
1167 res |= POLLOUT | POLLWRNORM;
95e159d6
HR		 1168 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1169 "sg_poll: res=0x%x\n", (int) res));
1da177e4
LT		 1170 return res;
1171}
1172
1173static int
1174sg_fasync(int fd, struct file *filp, int mode)
1175{
1da177e4
LT		 1176 Sg_device *sdp;
1177 Sg_fd *sfp;
1178
1179 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1180 return -ENXIO;
95e159d6
HR		 1181 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1182 "sg_fasync: mode=%d\n", mode));
1da177e4 1183
60aa4924 1184 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1da177e4
LT		 1185}
1186
a13ff0bb 1187static int
11bac800 1188sg_vma_fault(struct vm_fault *vmf)
1da177e4 1189{
11bac800 1190 struct vm_area_struct *vma = vmf->vma;
1da177e4 1191 Sg_fd *sfp;
d6b10348 1192 unsigned long offset, len, sa;
1da177e4 1193 Sg_scatter_hold *rsv_schp;
10db10d1 1194 int k, length;
1da177e4
LT		 1195
1196 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1197 return VM_FAULT_SIGBUS;
1da177e4 1198 rsv_schp = &sfp->reserve;
a13ff0bb 1199 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1200 if (offset >= rsv_schp->bufflen)
a13ff0bb 1201 return VM_FAULT_SIGBUS;
95e159d6
HR		 1202 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1203 "sg_vma_fault: offset=%lu, scatg=%d\n",
1204 offset, rsv_schp->k_use_sg));
d6b10348 1205 sa = vma->vm_start;
10db10d1
FT		 1206 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1207 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1208 len = vma->vm_end - sa;
10db10d1 1209 len = (len < length) ? len : length;
d6b10348 1210 if (offset < len) {
10db10d1
FT		 1211 struct page *page = nth_page(rsv_schp->pages[k],
1212 offset >> PAGE_SHIFT);
d6b10348 1213 get_page(page); /* increment page count */
a13ff0bb
NP		 1214 vmf->page = page;
1215 return 0; /* success */
1da177e4 1216 }
d6b10348
MC		 1217 sa += len;
1218 offset -= len;
1da177e4 1219 }
d6b10348 1220
a13ff0bb 1221 return VM_FAULT_SIGBUS;
1da177e4
LT		 1222}
1223
f0f37e2f 1224static const struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1225 .fault = sg_vma_fault,
1da177e4
LT		 1226};
1227
1228static int
1229sg_mmap(struct file *filp, struct vm_area_struct *vma)
1230{
1231 Sg_fd *sfp;
d6b10348 1232 unsigned long req_sz, len, sa;
1da177e4 1233 Sg_scatter_hold *rsv_schp;
10db10d1 1234 int k, length;
6a8dadcc 1235 int ret = 0;
1da177e4
LT		 1236
1237 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1238 return -ENXIO;
cb59e840 1239 req_sz = vma->vm_end - vma->vm_start;
95e159d6
HR		 1240 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1241 "sg_mmap starting, vm_start=%p, len=%d\n",
1242 (void *) vma->vm_start, (int) req_sz));
1da177e4
LT		 1243 if (vma->vm_pgoff)
1244 return -EINVAL; /* want no offset */
1245 rsv_schp = &sfp->reserve;
6a8dadcc
TP		 1246 mutex_lock(&sfp->f_mutex);
1247 if (req_sz > rsv_schp->bufflen) {
1248 ret = -ENOMEM; /* cannot map more than reserved buffer */
1249 goto out;
1250 }
1da177e4 1251
d6b10348 1252 sa = vma->vm_start;
10db10d1
FT		 1253 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1254 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
d6b10348 1255 len = vma->vm_end - sa;
10db10d1 1256 len = (len < length) ? len : length;
d6b10348 1257 sa += len;
1da177e4 1258 }
d6b10348 1259
f9aed0e2 1260 sfp->mmap_called = 1;
461c7fa1 1261 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1da177e4
LT		 1262 vma->vm_private_data = sfp;
1263 vma->vm_ops = &sg_mmap_vm_ops;
6a8dadcc
TP		 1264out:
1265 mutex_unlock(&sfp->f_mutex);
1266 return ret;
1da177e4
LT		 1267}
1268
cc833acb
DG		 1269static void
1270sg_rq_end_io_usercontext(struct work_struct *work)
c96952ed
FT		 1271{
1272 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1273 struct sg_fd *sfp = srp->parentfp;
1274
1275 sg_finish_rem_req(srp);
97d27b0d 1276 sg_remove_request(sfp, srp);
c96952ed
FT		 1277 kref_put(&sfp->f_ref, sg_remove_sfp);
1278}
1279
a91a3a20
FT		 1280/*
1281 * This function is a "bottom half" handler that is called by the mid
1282 * level when a command is completed (or has failed).
1283 */
cc833acb 1284static void
2a842aca 1285sg_rq_end_io(struct request *rq, blk_status_t status)
1da177e4 1286{
a91a3a20 1287 struct sg_request *srp = rq->end_io_data;
82ed4db4 1288 struct scsi_request *req = scsi_req(rq);
c6517b79 1289 Sg_device *sdp;
1da177e4 1290 Sg_fd *sfp;
1da177e4 1291 unsigned long iflags;
cb59e840 1292 unsigned int ms;
a91a3a20 1293 char *sense;
c6517b79 1294 int result, resid, done = 1;
1da177e4 1295
c6517b79 1296 if (WARN_ON(srp->done != 0))
1da177e4 1297 return;
c6517b79 1298
1da177e4 1299 sfp = srp->parentfp;
c6517b79 1300 if (WARN_ON(sfp == NULL))
1da177e4 1301 return;
c6517b79
TB		 1302
1303 sdp = sfp->parentdp;
cc833acb
DG		 1304 if (unlikely(atomic_read(&sdp->detaching)))
1305 pr_info("%s: device detaching\n", __func__);
1da177e4 1306
82ed4db4 1307 sense = req->sense;
17d5363b 1308 result = req->result;
82ed4db4 1309 resid = req->resid_len;
1da177e4 1310
95e159d6
HR		 1311 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1312 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1313 srp->header.pack_id, result));
d6b10348 1314 srp->header.resid = resid;
cb59e840 1315 ms = jiffies_to_msecs(jiffies);
1316 srp->header.duration = (ms > srp->header.duration) ?
1317 (ms - srp->header.duration) : 0;
d6b10348 1318 if (0 != result) {
1da177e4
LT		 1319 struct scsi_sense_hdr sshdr;
1320
d6b10348
MC		 1321 srp->header.status = 0xff & result;
1322 srp->header.masked_status = status_byte(result);
1323 srp->header.msg_status = msg_byte(result);
1324 srp->header.host_status = host_byte(result);
1325 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1326 if ((sdp->sgdebug > 0) &&
1327 ((CHECK_CONDITION == srp->header.masked_status) ||
1328 (COMMAND_TERMINATED == srp->header.masked_status)))
d811b848 1329 __scsi_print_sense(sdp->device, __func__, sense,
d6b10348 1330 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1331
1332 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1333 if (driver_byte(result) != 0
1334 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1335 && !scsi_sense_is_deferred(&sshdr)
1336 && sshdr.sense_key == UNIT_ATTENTION
1337 && sdp->device->removable) {
1338 /* Detected possible disc change. Set the bit - this */
1339 /* may be used if there are filesystems using this device */
1340 sdp->device->changed = 1;
1341 }
1342 }
82ed4db4
CH		 1343
1344 if (req->sense_len)
1345 memcpy(srp->sense_b, req->sense, SCSI_SENSE_BUFFERSIZE);
1346
1da177e4
LT		 1347 /* Rely on write phase to clean out srp status values, so no "else" */
1348
7568615c
TB		 1349 /*
1350 * Free the request as soon as it is complete so that its resources
1351 * can be reused without waiting for userspace to read() the
1352 * result. But keep the associated bio (if any) around until
1353 * blk_rq_unmap_user() can be called from user context.
1354 */
1355 srp->rq = NULL;
82ed4db4 1356 scsi_req_free_cmd(scsi_req(rq));
7568615c
TB		 1357 __blk_put_request(rq->q, rq);
1358
c6517b79
TB		 1359 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1360 if (unlikely(srp->orphan)) {
1da177e4
LT		 1361 if (sfp->keep_orphan)
1362 srp->sg_io_owned = 0;
c6517b79
TB		 1363 else
1364 done = 0;
1da177e4 1365 }
c6517b79
TB		 1366 srp->done = done;
1367 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1368
1369 if (likely(done)) {
1370 /* Now wake up any sg_read() that is waiting for this
1371 * packet.
1372 */
1da177e4 1373 wake_up_interruptible(&sfp->read_wait);
c6517b79 1374 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
c96952ed 1375 kref_put(&sfp->f_ref, sg_remove_sfp);
015640ed
FT		 1376 } else {
1377 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1378 schedule_work(&srp->ew.work);
1379 }
1da177e4
LT		 1380}
1381
828c0950 1382static const struct file_operations sg_fops = {
1da177e4
LT		 1383 .owner = THIS_MODULE,
1384 .read = sg_read,
1385 .write = sg_write,
1386 .poll = sg_poll,
37b9d1e0 1387 .unlocked_ioctl = sg_ioctl,
1da177e4
LT		 1388#ifdef CONFIG_COMPAT
1389 .compat_ioctl = sg_compat_ioctl,
1390#endif
1391 .open = sg_open,
1392 .mmap = sg_mmap,
1393 .release = sg_release,
1394 .fasync = sg_fasync,
6038f373 1395 .llseek = no_llseek,
1da177e4
LT		 1396};
1397
d253878b 1398static struct class *sg_sysfs_class;
1da177e4
LT		 1399
1400static int sg_sysfs_valid = 0;
1401
cc833acb
DG		 1402static Sg_device *
1403sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1404{
d6b10348 1405 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1406 Sg_device *sdp;
1407 unsigned long iflags;
7c07d613
JB		 1408 int error;
1409 u32 k;
1da177e4 1410
24669f75 1411 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4 1412 if (!sdp) {
cc833acb
DG		 1413 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1414 "failure\n", __func__);
7c07d613
JB		 1415 return ERR_PTR(-ENOMEM);
1416 }
c6517b79 1417
b98c52b5 1418 idr_preload(GFP_KERNEL);
7c07d613 1419 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4 1420
b98c52b5
TH		 1421 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1422 if (error < 0) {
1423 if (error == -ENOSPC) {
1424 sdev_printk(KERN_WARNING, scsidp,
1425 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1426 scsidp->type, SG_MAX_DEVS - 1);
1427 error = -ENODEV;
1428 } else {
cc833acb
DG		 1429 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1430 "allocation Sg_device failure: %d\n",
1431 __func__, error);
b98c52b5
TH		 1432 }
1433 goto out_unlock;
1da177e4 1434 }
b98c52b5 1435 k = error;
1da177e4 1436
95e159d6
HR		 1437 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1438 "sg_alloc: dev=%d \n", k));
1da177e4
LT		 1439 sprintf(disk->disk_name, "sg%d", k);
1440 disk->first_minor = k;
1441 sdp->disk = disk;
1442 sdp->device = scsidp;
cc833acb 1443 mutex_init(&sdp->open_rel_lock);
3442f802 1444 INIT_LIST_HEAD(&sdp->sfds);
cc833acb
DG		 1445 init_waitqueue_head(&sdp->open_wait);
1446 atomic_set(&sdp->detaching, 0);
1447 rwlock_init(&sdp->sfd_lock);
8a78362c 1448 sdp->sg_tablesize = queue_max_segments(q);
7c07d613 1449 sdp->index = k;
c6517b79 1450 kref_init(&sdp->d_ref);
b98c52b5 1451 error = 0;
c6517b79 1452
b98c52b5 1453out_unlock:
c6517b79 1454 write_unlock_irqrestore(&sg_index_lock, iflags);
b98c52b5 1455 idr_preload_end();
1da177e4 1456
7c07d613 1457 if (error) {
1da177e4 1458 kfree(sdp);
7c07d613
JB		 1459 return ERR_PTR(error);
1460 }
1461 return sdp;
1da177e4
LT		 1462}
1463
1464static int
cc833acb 1465sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1466{
ee959b00 1467 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1468 struct gendisk *disk;
1469 Sg_device *sdp = NULL;
1470 struct cdev * cdev = NULL;
7c07d613 1471 int error;
454e8957 1472 unsigned long iflags;
1da177e4
LT		 1473
1474 disk = alloc_disk(1);
1475 if (!disk) {
cc833acb 1476 pr_warn("%s: alloc_disk failed\n", __func__);
1da177e4
LT		 1477 return -ENOMEM;
1478 }
1479 disk->major = SCSI_GENERIC_MAJOR;
1480
1481 error = -ENOMEM;
1482 cdev = cdev_alloc();
1483 if (!cdev) {
cc833acb 1484 pr_warn("%s: cdev_alloc failed\n", __func__);
1da177e4
LT		 1485 goto out;
1486 }
1487 cdev->owner = THIS_MODULE;
1488 cdev->ops = &sg_fops;
1489
7c07d613
JB		 1490 sdp = sg_alloc(disk, scsidp);
1491 if (IS_ERR(sdp)) {
cc833acb 1492 pr_warn("%s: sg_alloc failed\n", __func__);
7c07d613 1493 error = PTR_ERR(sdp);
1da177e4
LT		 1494 goto out;
1495 }
1da177e4 1496
7c07d613 1497 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1498 if (error)
454e8957 1499 goto cdev_add_err;
5e3c34c1 1500
1da177e4
LT		 1501 sdp->cdev = cdev;
1502 if (sg_sysfs_valid) {
ee959b00 1503 struct device *sg_class_member;
1da177e4 1504
d73a1a67
GKH		 1505 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1506 MKDEV(SCSI_GENERIC_MAJOR,
1507 sdp->index),
1508 sdp, "%s", disk->disk_name);
d07e0361 1509 if (IS_ERR(sg_class_member)) {
cc833acb 1510 pr_err("%s: device_create failed\n", __func__);
d07e0361
FT		 1511 error = PTR_ERR(sg_class_member);
1512 goto cdev_add_err;
1513 }
d07e0361 1514 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1515 &sg_class_member->kobj, "generic");
1516 if (error)
cc833acb
DG		 1517 pr_err("%s: unable to make symlink 'generic' back "
1518 "to sg%d\n", __func__, sdp->index);
1da177e4 1519 } else
cc833acb 1520 pr_warn("%s: sg_sys Invalid\n", __func__);
1da177e4 1521
cc833acb
DG		 1522 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1523 "type %d\n", sdp->index, scsidp->type);
1da177e4 1524
ee959b00 1525 dev_set_drvdata(cl_dev, sdp);
a24484f2 1526
1da177e4
LT		 1527 return 0;
1528
454e8957 1529cdev_add_err:
7c07d613
JB		 1530 write_lock_irqsave(&sg_index_lock, iflags);
1531 idr_remove(&sg_index_idr, sdp->index);
1532 write_unlock_irqrestore(&sg_index_lock, iflags);
1533 kfree(sdp);
454e8957 1534
1da177e4
LT		 1535out:
1536 put_disk(disk);
1537 if (cdev)
1538 cdev_del(cdev);
1539 return error;
1540}
1541
cc833acb
DG		 1542static void
1543sg_device_destroy(struct kref *kref)
c6517b79
TB		 1544{
1545 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1546 unsigned long flags;
1547
1548 /* CAUTION! Note that the device can still be found via idr_find()
1549 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1550 * any other cleanup.
1551 */
1552
1553 write_lock_irqsave(&sg_index_lock, flags);
1554 idr_remove(&sg_index_idr, sdp->index);
1555 write_unlock_irqrestore(&sg_index_lock, flags);
1556
1557 SCSI_LOG_TIMEOUT(3,
95e159d6 1558 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
c6517b79
TB		 1559
1560 put_disk(sdp->disk);
1561 kfree(sdp);
1562}
1563
cc833acb
DG		 1564static void
1565sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1566{
ee959b00
TJ		 1567 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1568 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1569 unsigned long iflags;
1570 Sg_fd *sfp;
cc833acb 1571 int val;
1da177e4 1572
cc833acb 1573 if (!sdp)
1da177e4 1574 return;
cc833acb
DG		 1575 /* want sdp->detaching non-zero as soon as possible */
1576 val = atomic_inc_return(&sdp->detaching);
1577 if (val > 1)
1578 return; /* only want to do following once per device */
7c07d613 1579
95e159d6
HR		 1580 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1581 "%s\n", __func__));
c6517b79 1582
cc833acb 1583 read_lock_irqsave(&sdp->sfd_lock, iflags);
3442f802 1584 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
cc833acb 1585 wake_up_interruptible_all(&sfp->read_wait);
c6517b79 1586 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
7c07d613 1587 }
cc833acb
DG		 1588 wake_up_interruptible_all(&sdp->open_wait);
1589 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
7c07d613
JB		 1590
1591 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1592 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1593 cdev_del(sdp->cdev);
1594 sdp->cdev = NULL;
1da177e4 1595
cc833acb 1596 kref_put(&sdp->d_ref, sg_device_destroy);
1da177e4
LT		 1597}
1598
6460e75a
DG		 1599module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1600module_param_named(def_reserved_size, def_reserved_size, int,
1601 S_IRUGO | S_IWUSR);
1da177e4
LT		 1602module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1603
1604MODULE_AUTHOR("Douglas Gilbert");
1605MODULE_DESCRIPTION("SCSI generic (sg) driver");
1606MODULE_LICENSE("GPL");
1607MODULE_VERSION(SG_VERSION_STR);
f018fa55 1608MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1609
6460e75a
DG		 1610MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1611 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1612MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1613MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1614
1615static int __init
1616init_sg(void)
1617{
1618 int rc;
1619
6460e75a
DG		 1620 if (scatter_elem_sz < PAGE_SIZE) {
1621 scatter_elem_sz = PAGE_SIZE;
1622 scatter_elem_sz_prev = scatter_elem_sz;
1623 }
1da177e4
LT		 1624 if (def_reserved_size >= 0)
1625 sg_big_buff = def_reserved_size;
6460e75a
DG		 1626 else
1627 def_reserved_size = sg_big_buff;
1da177e4
LT		 1628
1629 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1630 SG_MAX_DEVS, "sg");
1631 if (rc)
1632 return rc;
d253878b 1633 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1634 if ( IS_ERR(sg_sysfs_class) ) {
1635 rc = PTR_ERR(sg_sysfs_class);
1636 goto err_out;
1637 }
1638 sg_sysfs_valid = 1;
1639 rc = scsi_register_interface(&sg_interface);
1640 if (0 == rc) {
1641#ifdef CONFIG_SCSI_PROC_FS
1642 sg_proc_init();
1643#endif /* CONFIG_SCSI_PROC_FS */
1644 return 0;
1645 }
d253878b 1646 class_destroy(sg_sysfs_class);
1da177e4
LT		 1647err_out:
1648 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1649 return rc;
1650}
1651
1652static void __exit
1653exit_sg(void)
1654{
1655#ifdef CONFIG_SCSI_PROC_FS
1656 sg_proc_cleanup();
1657#endif /* CONFIG_SCSI_PROC_FS */
1658 scsi_unregister_interface(&sg_interface);
d253878b 1659 class_destroy(sg_sysfs_class);
1da177e4
LT		 1660 sg_sysfs_valid = 0;
1661 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1662 SG_MAX_DEVS);
7c07d613 1663 idr_destroy(&sg_index_idr);
1da177e4
LT		 1664}
1665
cc833acb
DG		 1666static int
1667sg_start_req(Sg_request *srp, unsigned char *cmd)
10865dfa 1668{
626710c9 1669 int res;
10865dfa 1670 struct request *rq;
82ed4db4 1671 struct scsi_request *req;
44c7b0ea
FT		 1672 Sg_fd *sfp = srp->parentfp;
1673 sg_io_hdr_t *hp = &srp->header;
1674 int dxfer_len = (int) hp->dxfer_len;
1675 int dxfer_dir = hp->dxfer_direction;
626710c9 1676 unsigned int iov_count = hp->iovec_count;
44c7b0ea
FT		 1677 Sg_scatter_hold *req_schp = &srp->data;
1678 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1679 struct request_queue *q = sfp->parentdp->device->request_queue;
626710c9 1680 struct rq_map_data *md, map_data;
10865dfa 1681 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
65c26a0f 1682 unsigned char *long_cmdp = NULL;
10865dfa 1683
95e159d6
HR		 1684 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1685 "sg_start_req: dxfer_len=%d\n",
1686 dxfer_len));
44c7b0ea 1687
65c26a0f
DG		 1688 if (hp->cmd_len > BLK_MAX_CDB) {
1689 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1690 if (!long_cmdp)
1691 return -ENOMEM;
1692 }
1693
7772855a
TB		 1694 /*
1695 * NOTE
1696 *
1697 * With scsi-mq enabled, there are a fixed number of preallocated
1698 * requests equal in number to shost->can_queue. If all of the
1699 * preallocated requests are already in use, then using GFP_ATOMIC with
1700 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1701 * will cause blk_get_request() to sleep until an active command
1702 * completes, freeing up a request. Neither option is ideal, but
1703 * GFP_KERNEL is the better choice to prevent userspace from getting an
1704 * unexpected EWOULDBLOCK.
1705 *
1706 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1707 * does not sleep except under memory pressure.
1708 */
aebf526b
CH		 1709 rq = blk_get_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ?
1710 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, GFP_KERNEL);
a492f075 1711 if (IS_ERR(rq)) {
65c26a0f 1712 kfree(long_cmdp);
a492f075 1713 return PTR_ERR(rq);
65c26a0f 1714 }
82ed4db4 1715 req = scsi_req(rq);
10865dfa 1716
65c26a0f 1717 if (hp->cmd_len > BLK_MAX_CDB)
82ed4db4
CH		 1718 req->cmd = long_cmdp;
1719 memcpy(req->cmd, cmd, hp->cmd_len);
1720 req->cmd_len = hp->cmd_len;
10865dfa
FT		 1721
1722 srp->rq = rq;
1723 rq->end_io_data = srp;
64c7f1d1 1724 req->retries = SG_DEFAULT_RETRIES;
10865dfa 1725
1da177e4 1726 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10db10d1 1727 return 0;
10865dfa 1728
626710c9
FT		 1729 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1730 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1731 !sfp->parentdp->device->host->unchecked_isa_dma &&
2610a254 1732 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
626710c9
FT		 1733 md = NULL;
1734 else
1735 md = &map_data;
1736
1737 if (md) {
1bc0eb04
HR		 1738 mutex_lock(&sfp->f_mutex);
1739 if (dxfer_len <= rsv_schp->bufflen &&
1740 !sfp->res_in_use) {
1741 sfp->res_in_use = 1;
626710c9 1742 sg_link_reserve(sfp, srp, dxfer_len);
8d26f491
TP		 1743 } else if (hp->flags & SG_FLAG_MMAP_IO) {
1744 res = -EBUSY; /* sfp->res_in_use == 1 */
1745 if (dxfer_len > rsv_schp->bufflen)
1746 res = -ENOMEM;
1bc0eb04 1747 mutex_unlock(&sfp->f_mutex);
8d26f491 1748 return res;
1bc0eb04 1749 } else {
626710c9 1750 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1bc0eb04
HR		 1751 if (res) {
1752 mutex_unlock(&sfp->f_mutex);
626710c9 1753 return res;
1bc0eb04 1754 }
626710c9 1755 }
1bc0eb04 1756 mutex_unlock(&sfp->f_mutex);
7e56cb0f 1757
626710c9
FT		 1758 md->pages = req_schp->pages;
1759 md->page_order = req_schp->page_order;
1760 md->nr_entries = req_schp->k_use_sg;
56c451f4 1761 md->offset = 0;
97ae77a1 1762 md->null_mapped = hp->dxferp ? 0 : 1;
ecb554a8
FT		 1763 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1764 md->from_user = 1;
1765 else
1766 md->from_user = 0;
626710c9
FT		 1767 }
1768
0fdf96b6 1769 if (iov_count) {
fdc81f45 1770 struct iovec *iov = NULL;
26e49cfc 1771 struct iov_iter i;
0fdf96b6 1772
fdc81f45
AV		 1773 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
1774 if (res < 0)
1775 return res;
0fdf96b6 1776
fdc81f45 1777 iov_iter_truncate(&i, hp->dxfer_len);
137d01df
AV		 1778 if (!iov_iter_count(&i)) {
1779 kfree(iov);
1780 return -EINVAL;
1781 }
0fdf96b6 1782
26e49cfc 1783 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
0fdf96b6
FT		 1784 kfree(iov);
1785 } else
626710c9
FT		 1786 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1787 hp->dxfer_len, GFP_ATOMIC);
10db10d1
FT		 1788
1789 if (!res) {
626710c9 1790 srp->bio = rq->bio;
10db10d1 1791
626710c9
FT		 1792 if (!md) {
1793 req_schp->dio_in_use = 1;
1794 hp->info |= SG_INFO_DIRECT_IO;
1795 }
1796 }
10db10d1 1797 return res;
1da177e4
LT		 1798}
1799
cc833acb
DG		 1800static int
1801sg_finish_rem_req(Sg_request *srp)
1da177e4 1802{
e7ee4cc0
FT		 1803 int ret = 0;
1804
1da177e4
LT		 1805 Sg_fd *sfp = srp->parentfp;
1806 Sg_scatter_hold *req_schp = &srp->data;
1807
95e159d6
HR		 1808 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1809 "sg_finish_rem_req: res_used=%d\n",
1810 (int) srp->res_used));
7568615c
TB		 1811 if (srp->bio)
1812 ret = blk_rq_unmap_user(srp->bio);
10db10d1 1813
7568615c 1814 if (srp->rq) {
82ed4db4 1815 scsi_req_free_cmd(scsi_req(srp->rq));
10865dfa 1816 blk_put_request(srp->rq);
6e5a30cb 1817 }
10865dfa 1818
e27168f8
CS		 1819 if (srp->res_used)
1820 sg_unlink_reserve(sfp, srp);
1821 else
95e159d6 1822 sg_remove_scat(sfp, req_schp);
e27168f8 1823
e7ee4cc0 1824 return ret;
1da177e4
LT		 1825}
1826
1827static int
1828sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1829{
10db10d1 1830 int sg_bufflen = tablesize * sizeof(struct page *);
2d20eaf9 1831 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1832
10db10d1
FT		 1833 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1834 if (!schp->pages)
1da177e4 1835 return -ENOMEM;
1da177e4 1836 schp->sglist_len = sg_bufflen;
d6b10348 1837 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1838}
1839
1da177e4
LT		 1840static int
1841sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1842{
10db10d1 1843 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
d6b10348 1844 int sg_tablesize = sfp->parentdp->sg_tablesize;
10db10d1
FT		 1845 int blk_size = buff_size, order;
1846 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
745dfa0d 1847 struct sg_device *sdp = sfp->parentdp;
1da177e4 1848
fb119935 1849 if (blk_size < 0)
1da177e4
LT		 1850 return -EFAULT;
1851 if (0 == blk_size)
1852 ++blk_size; /* don't know why */
b2ed6c69
FT		 1853 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1854 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
95e159d6
HR		 1855 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1856 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1857 buff_size, blk_size));
d6b10348
MC		 1858
1859 /* N.B. ret_sz carried into this block ... */
1860 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1861 if (mx_sc_elems < 0)
1862 return mx_sc_elems; /* most likely -ENOMEM */
1863
6460e75a
DG		 1864 num = scatter_elem_sz;
1865 if (unlikely(num != scatter_elem_sz_prev)) {
1866 if (num < PAGE_SIZE) {
1867 scatter_elem_sz = PAGE_SIZE;
1868 scatter_elem_sz_prev = PAGE_SIZE;
1869 } else
1870 scatter_elem_sz_prev = num;
1871 }
10db10d1 1872
745dfa0d 1873 if (sdp->device->host->unchecked_isa_dma)
10db10d1
FT		 1874 gfp_mask |= GFP_DMA;
1875
1876 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1877 gfp_mask |= __GFP_ZERO;
1878
1879 order = get_order(num);
1880retry:
1881 ret_sz = 1 << (PAGE_SHIFT + order);
1882
1883 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1884 k++, rem_sz -= ret_sz) {
1885
6460e75a 1886 num = (rem_sz > scatter_elem_sz_prev) ?
10db10d1
FT		 1887 scatter_elem_sz_prev : rem_sz;
1888
1889 schp->pages[k] = alloc_pages(gfp_mask, order);
1890 if (!schp->pages[k])
1891 goto out;
d6b10348 1892
6460e75a
DG		 1893 if (num == scatter_elem_sz_prev) {
1894 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1895 scatter_elem_sz = ret_sz;
1896 scatter_elem_sz_prev = ret_sz;
1897 }
1898 }
d6b10348 1899
95e159d6
HR		 1900 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1901 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1902 k, num, ret_sz));
d6b10348
MC		 1903 } /* end of for loop */
1904
10db10d1 1905 schp->page_order = order;
d6b10348 1906 schp->k_use_sg = k;
95e159d6
HR		 1907 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1908 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1909 k, rem_sz));
d6b10348
MC		 1910
1911 schp->bufflen = blk_size;
1912 if (rem_sz > 0) /* must have failed */
1913 return -ENOMEM;
1da177e4 1914 return 0;
10db10d1
FT		 1915out:
1916 for (i = 0; i < k; i++)
e71044ee 1917 __free_pages(schp->pages[i], order);
10db10d1
FT		 1918
1919 if (--order >= 0)
1920 goto retry;
1921
1922 return -ENOMEM;
1da177e4
LT		 1923}
1924
1da177e4 1925static void
95e159d6 1926sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1da177e4 1927{
95e159d6
HR		 1928 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1929 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
10db10d1 1930 if (schp->pages && schp->sglist_len > 0) {
6e5a30cb 1931 if (!schp->dio_in_use) {
1da177e4
LT		 1932 int k;
1933
10db10d1 1934 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
95e159d6
HR		 1935 SCSI_LOG_TIMEOUT(5,
1936 sg_printk(KERN_INFO, sfp->parentdp,
1937 "sg_remove_scat: k=%d, pg=0x%p\n",
1938 k, schp->pages[k]));
10db10d1 1939 __free_pages(schp->pages[k], schp->page_order);
1da177e4 1940 }
6e5a30cb 1941
10db10d1 1942 kfree(schp->pages);
1da177e4 1943 }
d6b10348 1944 }
1da177e4
LT		 1945 memset(schp, 0, sizeof (*schp));
1946}
1947
1da177e4
LT		 1948static int
1949sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1950{
1951 Sg_scatter_hold *schp = &srp->data;
d6b10348 1952 int k, num;
1da177e4 1953
95e159d6
HR		 1954 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1955 "sg_read_oxfer: num_read_xfer=%d\n",
1956 num_read_xfer));
1da177e4
LT		 1957 if ((!outp) || (num_read_xfer <= 0))
1958 return 0;
d6b10348 1959
10db10d1
FT		 1960 num = 1 << (PAGE_SHIFT + schp->page_order);
1961 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
d6b10348 1962 if (num > num_read_xfer) {
10db10d1 1963 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1964 num_read_xfer))
1965 return -EFAULT;
1966 break;
1967 } else {
10db10d1 1968 if (__copy_to_user(outp, page_address(schp->pages[k]),
d6b10348
MC		 1969 num))
1970 return -EFAULT;
1971 num_read_xfer -= num;
1972 if (num_read_xfer <= 0)
1da177e4 1973 break;
d6b10348 1974 outp += num;
1da177e4 1975 }
1da177e4 1976 }
d6b10348 1977
1da177e4
LT		 1978 return 0;
1979}
1980
1981static void
1982sg_build_reserve(Sg_fd * sfp, int req_size)
1983{
1984 Sg_scatter_hold *schp = &sfp->reserve;
1985
95e159d6
HR		 1986 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1987 "sg_build_reserve: req_size=%d\n", req_size));
1da177e4
LT		 1988 do {
1989 if (req_size < PAGE_SIZE)
1990 req_size = PAGE_SIZE;
1991 if (0 == sg_build_indirect(schp, sfp, req_size))
1992 return;
1993 else
95e159d6 1994 sg_remove_scat(sfp, schp);
1da177e4
LT		 1995 req_size >>= 1; /* divide by 2 */
1996 } while (req_size > (PAGE_SIZE / 2));
1997}
1998
1999static void
2000sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2001{
2002 Sg_scatter_hold *req_schp = &srp->data;
2003 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348 2004 int k, num, rem;
1da177e4
LT		 2005
2006 srp->res_used = 1;
95e159d6
HR		 2007 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
2008 "sg_link_reserve: size=%d\n", size));
eca7be5e 2009 rem = size;
d6b10348 2010
10db10d1
FT		 2011 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
2012 for (k = 0; k < rsv_schp->k_use_sg; k++) {
d6b10348 2013 if (rem <= num) {
d6b10348
MC		 2014 req_schp->k_use_sg = k + 1;
2015 req_schp->sglist_len = rsv_schp->sglist_len;
10db10d1 2016 req_schp->pages = rsv_schp->pages;
d6b10348
MC		 2017
2018 req_schp->bufflen = size;
10db10d1 2019 req_schp->page_order = rsv_schp->page_order;
d6b10348
MC		 2020 break;
2021 } else
2022 rem -= num;
1da177e4 2023 }
d6b10348
MC		 2024
2025 if (k >= rsv_schp->k_use_sg)
95e159d6
HR		 2026 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2027 "sg_link_reserve: BAD size\n"));
1da177e4
LT		 2028}
2029
2030static void
2031sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2032{
2033 Sg_scatter_hold *req_schp = &srp->data;
1da177e4 2034
95e159d6
HR		 2035 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2036 "sg_unlink_reserve: req->k_use_sg=%d\n",
2037 (int) req_schp->k_use_sg));
1da177e4
LT		 2038 req_schp->k_use_sg = 0;
2039 req_schp->bufflen = 0;
10db10d1
FT		 2040 req_schp->pages = NULL;
2041 req_schp->page_order = 0;
1da177e4 2042 req_schp->sglist_len = 0;
1da177e4 2043 srp->res_used = 0;
e791ce27
HR		 2044 /* Called without mutex lock to avoid deadlock */
2045 sfp->res_in_use = 0;
1da177e4
LT		 2046}
2047
2048static Sg_request *
2049sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2050{
2051 Sg_request *resp;
2052 unsigned long iflags;
2053
2054 write_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9 2055 list_for_each_entry(resp, &sfp->rq_list, entry) {
1da177e4
LT		 2056 /* look for requests that are ready + not SG_IO owned */
2057 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2058 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2059 resp->done = 2; /* guard against other readers */
48ae8484
JT		 2060 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2061 return resp;
1da177e4
LT		 2062 }
2063 }
2064 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
48ae8484 2065 return NULL;
1da177e4
LT		 2066}
2067
1da177e4
LT		 2068/* always adds to end of list */
2069static Sg_request *
2070sg_add_request(Sg_fd * sfp)
2071{
2072 int k;
2073 unsigned long iflags;
1da177e4
LT		 2074 Sg_request *rp = sfp->req_arr;
2075
2076 write_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9
HR		 2077 if (!list_empty(&sfp->rq_list)) {
2078 if (!sfp->cmd_q)
2079 goto out_unlock;
2080
2081 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2082 if (!rp->parentfp)
2083 break;
1da177e4 2084 }
109bade9
HR		 2085 if (k >= SG_MAX_QUEUE)
2086 goto out_unlock;
1da177e4 2087 }
109bade9
HR		 2088 memset(rp, 0, sizeof (Sg_request));
2089 rp->parentfp = sfp;
2090 rp->header.duration = jiffies_to_msecs(jiffies);
2091 list_add_tail(&rp->entry, &sfp->rq_list);
1da177e4 2092 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
109bade9
HR		 2093 return rp;
2094out_unlock:
2095 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2096 return NULL;
1da177e4
LT		 2097}
2098
2099/* Return of 1 for found; 0 for not found */
2100static int
2101sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2102{
1da177e4
LT		 2103 unsigned long iflags;
2104 int res = 0;
2105
109bade9 2106 if (!sfp || !srp || list_empty(&sfp->rq_list))
1da177e4
LT		 2107 return res;
2108 write_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9
HR		 2109 if (!list_empty(&srp->entry)) {
2110 list_del(&srp->entry);
2111 srp->parentfp = NULL;
1da177e4 2112 res = 1;
1da177e4
LT		 2113 }
2114 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2115 return res;
2116}
2117
1da177e4 2118static Sg_fd *
95e159d6 2119sg_add_sfp(Sg_device * sdp)
1da177e4
LT		 2120{
2121 Sg_fd *sfp;
2122 unsigned long iflags;
44ec9542 2123 int bufflen;
1da177e4 2124
d6b10348 2125 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4 2126 if (!sfp)
cc833acb 2127 return ERR_PTR(-ENOMEM);
d6b10348 2128
1da177e4
LT		 2129 init_waitqueue_head(&sfp->read_wait);
2130 rwlock_init(&sfp->rq_list_lock);
109bade9 2131 INIT_LIST_HEAD(&sfp->rq_list);
c6517b79 2132 kref_init(&sfp->f_ref);
1bc0eb04 2133 mutex_init(&sfp->f_mutex);
1da177e4
LT		 2134 sfp->timeout = SG_DEFAULT_TIMEOUT;
2135 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2136 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
1da177e4
LT		 2137 sfp->cmd_q = SG_DEF_COMMAND_Q;
2138 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2139 sfp->parentdp = sdp;
cc833acb
DG		 2140 write_lock_irqsave(&sdp->sfd_lock, iflags);
2141 if (atomic_read(&sdp->detaching)) {
2142 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2143 return ERR_PTR(-ENODEV);
2144 }
3442f802 2145 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
cc833acb 2146 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
95e159d6
HR		 2147 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2148 "sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2149 if (unlikely(sg_big_buff != def_reserved_size))
2150 sg_big_buff = def_reserved_size;
2151
44ec9542 2152 bufflen = min_t(int, sg_big_buff,
46f69e6a 2153 max_sectors_bytes(sdp->device->request_queue));
44ec9542 2154 sg_build_reserve(sfp, bufflen);
95e159d6
HR		 2155 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2156 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2157 sfp->reserve.bufflen,
2158 sfp->reserve.k_use_sg));
c6517b79
TB		 2159
2160 kref_get(&sdp->d_ref);
2161 __module_get(THIS_MODULE);
1da177e4
LT		 2162 return sfp;
2163}
2164
cc833acb
DG		 2165static void
2166sg_remove_sfp_usercontext(struct work_struct *work)
1da177e4 2167{
c6517b79
TB		 2168 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2169 struct sg_device *sdp = sfp->parentdp;
109bade9 2170 Sg_request *srp;
97d27b0d 2171 unsigned long iflags;
c6517b79
TB		 2172
2173 /* Cleanup any responses which were never read(). */
97d27b0d 2174 write_lock_irqsave(&sfp->rq_list_lock, iflags);
109bade9
HR		 2175 while (!list_empty(&sfp->rq_list)) {
2176 srp = list_first_entry(&sfp->rq_list, Sg_request, entry);
2177 sg_finish_rem_req(srp);
97d27b0d
HR		 2178 list_del(&srp->entry);
2179 srp->parentfp = NULL;
109bade9 2180 }
97d27b0d 2181 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1da177e4 2182
1da177e4 2183 if (sfp->reserve.bufflen > 0) {
95e159d6
HR		 2184 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2185 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
c6517b79
TB		 2186 (int) sfp->reserve.bufflen,
2187 (int) sfp->reserve.k_use_sg));
95e159d6 2188 sg_remove_scat(sfp, &sfp->reserve);
1da177e4 2189 }
c6517b79 2190
95e159d6
HR		 2191 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2192 "sg_remove_sfp: sfp=0x%p\n", sfp));
d6b10348 2193 kfree(sfp);
c6517b79
TB		 2194
2195 scsi_device_put(sdp->device);
cc833acb 2196 kref_put(&sdp->d_ref, sg_device_destroy);
c6517b79 2197 module_put(THIS_MODULE);
1da177e4
LT		 2198}
2199
cc833acb
DG		 2200static void
2201sg_remove_sfp(struct kref *kref)
1da177e4 2202{
c6517b79 2203 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
065b4a2f 2204 struct sg_device *sdp = sfp->parentdp;
c6517b79 2205 unsigned long iflags;
1da177e4 2206
cc833acb 2207 write_lock_irqsave(&sdp->sfd_lock, iflags);
3442f802 2208 list_del(&sfp->sfd_siblings);
cc833acb 2209 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
1da177e4 2210
015640ed
FT		 2211 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2212 schedule_work(&sfp->ew.work);
1da177e4
LT		 2213}
2214
1da177e4 2215#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2216static int
2217sg_idr_max_id(int id, void *p, void *data)
2218{
2219 int *k = data;
2220
2221 if (*k < id)
2222 *k = id;
2223
2224 return 0;
2225}
2226
1da177e4
LT		 2227static int
2228sg_last_dev(void)
2229{
53474c04 2230 int k = -1;
1da177e4
LT		 2231 unsigned long iflags;
2232
7c07d613
JB		 2233 read_lock_irqsave(&sg_index_lock, iflags);
2234 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2235 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2236 return k + 1; /* origin 1 */
2237}
2238#endif
2239
c6517b79
TB		 2240/* must be called with sg_index_lock held */
2241static Sg_device *sg_lookup_dev(int dev)
1da177e4 2242{
c6517b79
TB		 2243 return idr_find(&sg_index_idr, dev);
2244}
1da177e4 2245
cc833acb
DG		 2246static Sg_device *
2247sg_get_dev(int dev)
c6517b79
TB		 2248{
2249 struct sg_device *sdp;
2250 unsigned long flags;
2251
2252 read_lock_irqsave(&sg_index_lock, flags);
2253 sdp = sg_lookup_dev(dev);
2254 if (!sdp)
2255 sdp = ERR_PTR(-ENXIO);
cc833acb
DG		 2256 else if (atomic_read(&sdp->detaching)) {
2257 /* If sdp->detaching, then the refcount may already be 0, in
c6517b79
TB		 2258 * which case it would be a bug to do kref_get().
2259 */
2260 sdp = ERR_PTR(-ENODEV);
2261 } else
2262 kref_get(&sdp->d_ref);
2263 read_unlock_irqrestore(&sg_index_lock, flags);
7c07d613 2264
1da177e4
LT		 2265 return sdp;
2266}
2267
2268#ifdef CONFIG_SCSI_PROC_FS
2269
2270static struct proc_dir_entry *sg_proc_sgp = NULL;
2271
2272static char sg_proc_sg_dirname[] = "scsi/sg";
2273
2274static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2275
2276static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2277static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2278 size_t count, loff_t *off);
828c0950
AD		 2279static const struct file_operations adio_fops = {
2280 .owner = THIS_MODULE,
1da177e4 2281 .open = sg_proc_single_open_adio,
828c0950
AD		 2282 .read = seq_read,
2283 .llseek = seq_lseek,
1da177e4
LT		 2284 .write = sg_proc_write_adio,
2285 .release = single_release,
2286};
2287
2288static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2289static ssize_t sg_proc_write_dressz(struct file *filp,
2290 const char __user *buffer, size_t count, loff_t *off);
828c0950
AD		 2291static const struct file_operations dressz_fops = {
2292 .owner = THIS_MODULE,
1da177e4 2293 .open = sg_proc_single_open_dressz,
828c0950
AD		 2294 .read = seq_read,
2295 .llseek = seq_lseek,
1da177e4
LT		 2296 .write = sg_proc_write_dressz,
2297 .release = single_release,
2298};
2299
2300static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2301static int sg_proc_single_open_version(struct inode *inode, struct file *file);
828c0950
AD		 2302static const struct file_operations version_fops = {
2303 .owner = THIS_MODULE,
1da177e4 2304 .open = sg_proc_single_open_version,
828c0950
AD		 2305 .read = seq_read,
2306 .llseek = seq_lseek,
1da177e4
LT		 2307 .release = single_release,
2308};
2309
2310static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2311static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
828c0950
AD		 2312static const struct file_operations devhdr_fops = {
2313 .owner = THIS_MODULE,
1da177e4 2314 .open = sg_proc_single_open_devhdr,
828c0950
AD		 2315 .read = seq_read,
2316 .llseek = seq_lseek,
1da177e4
LT		 2317 .release = single_release,
2318};
2319
2320static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2321static int sg_proc_open_dev(struct inode *inode, struct file *file);
2322static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2323static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2324static void dev_seq_stop(struct seq_file *s, void *v);
828c0950
AD		 2325static const struct file_operations dev_fops = {
2326 .owner = THIS_MODULE,
1da177e4 2327 .open = sg_proc_open_dev,
828c0950
AD		 2328 .read = seq_read,
2329 .llseek = seq_lseek,
1da177e4
LT		 2330 .release = seq_release,
2331};
88e9d34c 2332static const struct seq_operations dev_seq_ops = {
1da177e4
LT		 2333 .start = dev_seq_start,
2334 .next = dev_seq_next,
2335 .stop = dev_seq_stop,
2336 .show = sg_proc_seq_show_dev,
2337};
2338
2339static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2340static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
828c0950
AD		 2341static const struct file_operations devstrs_fops = {
2342 .owner = THIS_MODULE,
1da177e4 2343 .open = sg_proc_open_devstrs,
828c0950
AD		 2344 .read = seq_read,
2345 .llseek = seq_lseek,
1da177e4
LT		 2346 .release = seq_release,
2347};
88e9d34c 2348static const struct seq_operations devstrs_seq_ops = {
1da177e4
LT		 2349 .start = dev_seq_start,
2350 .next = dev_seq_next,
2351 .stop = dev_seq_stop,
2352 .show = sg_proc_seq_show_devstrs,
2353};
2354
2355static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2356static int sg_proc_open_debug(struct inode *inode, struct file *file);
828c0950
AD		 2357static const struct file_operations debug_fops = {
2358 .owner = THIS_MODULE,
1da177e4 2359 .open = sg_proc_open_debug,
828c0950
AD		 2360 .read = seq_read,
2361 .llseek = seq_lseek,
1da177e4
LT		 2362 .release = seq_release,
2363};
88e9d34c 2364static const struct seq_operations debug_seq_ops = {
1da177e4
LT		 2365 .start = dev_seq_start,
2366 .next = dev_seq_next,
2367 .stop = dev_seq_stop,
2368 .show = sg_proc_seq_show_debug,
2369};
2370
2371
2372struct sg_proc_leaf {
2373 const char * name;
828c0950 2374 const struct file_operations * fops;
1da177e4
LT		 2375};
2376
18b8ba6c 2377static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
1da177e4
LT		 2378 {"allow_dio", &adio_fops},
2379 {"debug", &debug_fops},
2380 {"def_reserved_size", &dressz_fops},
2381 {"device_hdr", &devhdr_fops},
2382 {"devices", &dev_fops},
2383 {"device_strs", &devstrs_fops},
2384 {"version", &version_fops}
2385};
2386
2387static int
2388sg_proc_init(void)
2389{
6391a113 2390 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
d161a13f 2391 int k;
1da177e4 2392
66600221 2393 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2394 if (!sg_proc_sgp)
2395 return 1;
2396 for (k = 0; k < num_leaves; ++k) {
18b8ba6c 2397 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
d161a13f 2398 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f 2399 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2400 }
2401 return 0;
2402}
2403
2404static void
2405sg_proc_cleanup(void)
2406{
2407 int k;
6391a113 2408 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2409
2410 if (!sg_proc_sgp)
2411 return;
2412 for (k = 0; k < num_leaves; ++k)
2413 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2414 remove_proc_entry(sg_proc_sg_dirname, NULL);
2415}
2416
2417
2418static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2419{
2420 seq_printf(s, "%d\n", *((int *)s->private));
2421 return 0;
2422}
2423
2424static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2425{
2426 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2427}
2428
2429static ssize_t
2430sg_proc_write_adio(struct file *filp, const char __user *buffer,
2431 size_t count, loff_t *off)
2432{
7e95fffe
SB		 2433 int err;
2434 unsigned long num;
1da177e4
LT		 2435
2436 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2437 return -EACCES;
7e95fffe
SB		 2438 err = kstrtoul_from_user(buffer, count, 0, &num);
2439 if (err)
2440 return err;
2441 sg_allow_dio = num ? 1 : 0;
1da177e4
LT		 2442 return count;
2443}
2444
2445static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2446{
2447 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2448}
2449
2450static ssize_t
2451sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2452 size_t count, loff_t *off)
2453{
7e95fffe 2454 int err;
1da177e4 2455 unsigned long k = ULONG_MAX;
1da177e4
LT		 2456
2457 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2458 return -EACCES;
7e95fffe
SB		 2459
2460 err = kstrtoul_from_user(buffer, count, 0, &k);
2461 if (err)
2462 return err;
1da177e4
LT		 2463 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2464 sg_big_buff = k;
2465 return count;
2466 }
2467 return -ERANGE;
2468}
2469
2470static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2471{
2472 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2473 sg_version_date);
2474 return 0;
2475}
2476
2477static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2478{
2479 return single_open(file, sg_proc_seq_show_version, NULL);
2480}
2481
2482static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2483{
cc833acb 2484 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
1da177e4
LT		 2485 return 0;
2486}
2487
2488static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2489{
2490 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2491}
2492
2493struct sg_proc_deviter {
2494 loff_t index;
2495 size_t max;
2496};
2497
2498static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2499{
2500 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2501
729d70f5 2502 s->private = it;
1da177e4
LT		 2503 if (! it)
2504 return NULL;
729d70f5 2505
1da177e4
LT		 2506 it->index = *pos;
2507 it->max = sg_last_dev();
2508 if (it->index >= it->max)
729d70f5 2509 return NULL;
1da177e4 2510 return it;
1da177e4
LT		 2511}
2512
2513static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2514{
729d70f5 2515 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2516
2517 *pos = ++it->index;
2518 return (it->index < it->max) ? it : NULL;
2519}
2520
2521static void dev_seq_stop(struct seq_file *s, void *v)
2522{
729d70f5 2523 kfree(s->private);
1da177e4
LT		 2524}
2525
2526static int sg_proc_open_dev(struct inode *inode, struct file *file)
2527{
2528 return seq_open(file, &dev_seq_ops);
2529}
2530
2531static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2532{
2533 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2534 Sg_device *sdp;
2535 struct scsi_device *scsidp;
c6517b79 2536 unsigned long iflags;
1da177e4 2537
c6517b79
TB		 2538 read_lock_irqsave(&sg_index_lock, iflags);
2539 sdp = it ? sg_lookup_dev(it->index) : NULL;
cc833acb
DG		 2540 if ((NULL == sdp) || (NULL == sdp->device) ||
2541 (atomic_read(&sdp->detaching)))
2542 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2543 else {
2544 scsidp = sdp->device;
9cb78c16 2545 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
1da177e4
LT		 2546 scsidp->host->host_no, scsidp->channel,
2547 scsidp->id, scsidp->lun, (int) scsidp->type,
2548 1,
2549 (int) scsidp->queue_depth,
71e75c97 2550 (int) atomic_read(&scsidp->device_busy),
1da177e4 2551 (int) scsi_device_online(scsidp));
cc833acb 2552 }
c6517b79 2553 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2554 return 0;
2555}
2556
2557static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2558{
2559 return seq_open(file, &devstrs_seq_ops);
2560}
2561
2562static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2563{
2564 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2565 Sg_device *sdp;
2566 struct scsi_device *scsidp;
c6517b79 2567 unsigned long iflags;
1da177e4 2568
c6517b79
TB		 2569 read_lock_irqsave(&sg_index_lock, iflags);
2570 sdp = it ? sg_lookup_dev(it->index) : NULL;
cc833acb
DG		 2571 scsidp = sdp ? sdp->device : NULL;
2572 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
1da177e4
LT		 2573 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2574 scsidp->vendor, scsidp->model, scsidp->rev);
2575 else
cc833acb 2576 seq_puts(s, "<no active device>\n");
c6517b79 2577 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2578 return 0;
2579}
2580
c0d3b9c2 2581/* must be called while holding sg_index_lock */
1da177e4
LT		 2582static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2583{
109bade9 2584 int k, new_interface, blen, usg;
1da177e4
LT		 2585 Sg_request *srp;
2586 Sg_fd *fp;
2587 const sg_io_hdr_t *hp;
2588 const char * cp;
cb59e840 2589 unsigned int ms;
1da177e4 2590
3442f802
FT		 2591 k = 0;
2592 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2593 k++;
c6517b79 2594 read_lock(&fp->rq_list_lock); /* irqs already disabled */
1da177e4 2595 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3442f802 2596 "(res)sgat=%d low_dma=%d\n", k,
1da177e4
LT		 2597 jiffies_to_msecs(fp->timeout),
2598 fp->reserve.bufflen,
2599 (int) fp->reserve.k_use_sg,
745dfa0d 2600 (int) sdp->device->host->unchecked_isa_dma);
ebaf466b 2601 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
1da177e4 2602 (int) fp->cmd_q, (int) fp->force_packid,
ebaf466b 2603 (int) fp->keep_orphan);
109bade9 2604 list_for_each_entry(srp, &fp->rq_list, entry) {
1da177e4
LT		 2605 hp = &srp->header;
2606 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2607 if (srp->res_used) {
109bade9 2608 if (new_interface &&
1da177e4
LT		 2609 (SG_FLAG_MMAP_IO & hp->flags))
2610 cp = " mmap>> ";
2611 else
2612 cp = " rb>> ";
2613 } else {
2614 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2615 cp = " dio>> ";
2616 else
2617 cp = " ";
2618 }
cc833acb 2619 seq_puts(s, cp);
d6b10348
MC		 2620 blen = srp->data.bufflen;
2621 usg = srp->data.k_use_sg;
cc833acb
DG		 2622 seq_puts(s, srp->done ?
2623 ((1 == srp->done) ? "rcv:" : "fin:")
2624 : "act:");
1da177e4
LT		 2625 seq_printf(s, " id=%d blen=%d",
2626 srp->header.pack_id, blen);
2627 if (srp->done)
2628 seq_printf(s, " dur=%d", hp->duration);
cb59e840 2629 else {
2630 ms = jiffies_to_msecs(jiffies);
1da177e4 2631 seq_printf(s, " t_o/elap=%d/%d",
cb59e840 2632 (new_interface ? hp->timeout :
2633 jiffies_to_msecs(fp->timeout)),
2634 (ms > hp->duration ? ms - hp->duration : 0));
2635 }
1da177e4
LT		 2636 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2637 (int) srp->data.cmd_opcode);
2638 }
109bade9 2639 if (list_empty(&fp->rq_list))
cc833acb 2640 seq_puts(s, " No requests active\n");
c6517b79 2641 read_unlock(&fp->rq_list_lock);
1da177e4
LT		 2642 }
2643}
2644
2645static int sg_proc_open_debug(struct inode *inode, struct file *file)
2646{
2647 return seq_open(file, &debug_seq_ops);
2648}
2649
2650static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2651{
2652 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2653 Sg_device *sdp;
c6517b79 2654 unsigned long iflags;
1da177e4 2655
cc833acb
DG		 2656 if (it && (0 == it->index))
2657 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2658 (int)it->max, sg_big_buff);
1da177e4 2659
c6517b79
TB		 2660 read_lock_irqsave(&sg_index_lock, iflags);
2661 sdp = it ? sg_lookup_dev(it->index) : NULL;
cc833acb
DG		 2662 if (NULL == sdp)
2663 goto skip;
2664 read_lock(&sdp->sfd_lock);
2665 if (!list_empty(&sdp->sfds)) {
c0d3b9c2 2666 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
cc833acb
DG		 2667 if (atomic_read(&sdp->detaching))
2668 seq_puts(s, "detaching pending close ");
2669 else if (sdp->device) {
2670 struct scsi_device *scsidp = sdp->device;
2671
9cb78c16 2672 seq_printf(s, "%d:%d:%d:%llu em=%d",
cc833acb
DG		 2673 scsidp->host->host_no,
2674 scsidp->channel, scsidp->id,
2675 scsidp->lun,
2676 scsidp->host->hostt->emulated);
2677 }
2678 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2679 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
c0d3b9c2 2680 sg_proc_debug_helper(s, sdp);
1da177e4 2681 }
cc833acb
DG		 2682 read_unlock(&sdp->sfd_lock);
2683skip:
c6517b79 2684 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2685 return 0;
2686}
2687
2688#endif /* CONFIG_SCSI_PROC_FS */
2689
2690module_init(init_sg);
2691module_exit(exit_sg);
Linux 6.x block layer and io_uring tree(s)