Line data Source code
1 : /*
2 : * History:
3 : * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
4 : * to allow user process control of SCSI devices.
5 : * Development Sponsored by Killy Corp. NY NY
6 : *
7 : * Original driver (sg.c):
8 : * Copyright (C) 1992 Lawrence Foard
9 : * Version 2 and 3 extensions to driver:
10 : * Copyright (C) 1998 - 2005 Douglas Gilbert
11 : *
12 : * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
13 : *
14 : * This program is free software; you can redistribute it and/or modify
15 : * it under the terms of the GNU General Public License as published by
16 : * the Free Software Foundation; either version 2, or (at your option)
17 : * any later version.
18 : *
19 : */
20 :
21 1 : static int sg_version_num = 30534; /* 2 digits for each component */
22 : #define SG_VERSION_STR "3.5.34"
23 :
24 : /*
25 : * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
26 : * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
27 : * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
28 : * (otherwise the macros compile to empty statements).
29 : *
30 : */
31 : #include <linux/module.h>
32 :
33 : #include <linux/fs.h>
34 : #include <linux/kernel.h>
35 : #include <linux/sched.h>
36 : #include <linux/string.h>
37 : #include <linux/mm.h>
38 : #include <linux/errno.h>
39 : #include <linux/mtio.h>
40 : #include <linux/ioctl.h>
41 : #include <linux/fcntl.h>
42 : #include <linux/init.h>
43 : #include <linux/poll.h>
44 : #include <linux/moduleparam.h>
45 : #include <linux/cdev.h>
46 : #include <linux/idr.h>
47 : #include <linux/seq_file.h>
48 : #include <linux/blkdev.h>
49 : #include <linux/delay.h>
50 : #include <linux/blktrace_api.h>
51 : #include <linux/smp_lock.h>
52 :
53 : #include "scsi.h"
54 : #include <scsi/scsi_dbg.h>
55 : #include <scsi/scsi_host.h>
56 : #include <scsi/scsi_driver.h>
57 : #include <scsi/scsi_ioctl.h>
58 : #include <scsi/sg.h>
59 :
60 : #include "scsi_logging.h"
61 :
62 : #ifdef CONFIG_SCSI_PROC_FS
63 : #include <linux/proc_fs.h>
64 1 : static char *sg_version_date = "20061027";
65 :
66 : static int sg_proc_init(void);
67 : static void sg_proc_cleanup(void);
68 : #endif
69 :
70 : #define SG_ALLOW_DIO_DEF 0
71 :
72 : #define SG_MAX_DEVS 32768
73 :
74 : /*
75 : * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
76 : * Then when using 32 bit integers x * m may overflow during the calculation.
77 : * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
78 : * calculates the same, but prevents the overflow when both m and d
79 : * are "small" numbers (like HZ and USER_HZ).
80 : * Of course an overflow is inavoidable if the result of muldiv doesn't fit
81 : * in 32 bits.
82 : */
83 : #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
84 :
85 : #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
86 :
87 1 : int sg_big_buff = SG_DEF_RESERVED_SIZE;
88 : /* N.B. This variable is readable and writeable via
89 : /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
90 : of this size (or less if there is not enough memory) will be reserved
91 : for use by this file descriptor. [Deprecated usage: this variable is also
92 : readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
93 : the kernel (i.e. it is not a module).] */
94 1 : static int def_reserved_size = -1; /* picks up init parameter */
95 1 : static int sg_allow_dio = SG_ALLOW_DIO_DEF;
96 :
97 1 : static int scatter_elem_sz = SG_SCATTER_SZ;
98 1 : static int scatter_elem_sz_prev = SG_SCATTER_SZ;
99 :
100 : #define SG_SECTOR_SZ 512
101 :
102 : static int sg_add(struct device *, struct class_interface *);
103 : static void sg_remove(struct device *, struct class_interface *);
104 :
105 1 : static DEFINE_IDR(sg_index_idr);
106 1 : static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
107 : file descriptor list for device */
108 :
109 1 : static struct class_interface sg_interface = {
110 : .add_dev = sg_add,
111 : .remove_dev = sg_remove,
112 1 : };
113 :
114 : typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
115 : unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
116 : unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
117 : unsigned bufflen; /* Size of (aggregate) data buffer */
118 : struct page **pages;
119 : int page_order;
120 : char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
121 : unsigned char cmd_opcode; /* first byte of command */
122 1 : } Sg_scatter_hold;
123 1 :
124 1 : struct sg_device; /* forward declarations */
125 1 : struct sg_fd;
126 :
127 : typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
128 : struct sg_request *nextrp; /* NULL -> tail request (slist) */
129 : struct sg_fd *parentfp; /* NULL -> not in use */
130 : Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
131 : sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
132 : unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
133 : char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
134 : char orphan; /* 1 -> drop on sight, 0 -> normal */
135 : char sg_io_owned; /* 1 -> packet belongs to SG_IO */
136 : volatile char done; /* 0->before bh, 1->before read, 2->read */
137 : struct request *rq;
138 : struct bio *bio;
139 : struct execute_work ew;
140 1 : } Sg_request;
141 1 :
142 : typedef struct sg_fd { /* holds the state of a file descriptor */
143 : struct list_head sfd_siblings;
144 : struct sg_device *parentdp; /* owning device */
145 : wait_queue_head_t read_wait; /* queue read until command done */
146 : rwlock_t rq_list_lock; /* protect access to list in req_arr */
147 : int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
148 : int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
149 : Sg_scatter_hold reserve; /* buffer held for this file descriptor */
150 : unsigned save_scat_len; /* original length of trunc. scat. element */
151 : Sg_request *headrp; /* head of request slist, NULL->empty */
152 : struct fasync_struct *async_qp; /* used by asynchronous notification */
153 : Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
154 : char low_dma; /* as in parent but possibly overridden to 1 */
155 : char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
156 : volatile char closed; /* 1 -> fd closed but request(s) outstanding */
157 : char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
158 : char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
159 : char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
160 : char mmap_called; /* 0 -> mmap() never called on this fd */
161 : struct kref f_ref;
162 : struct execute_work ew;
163 1 : } Sg_fd;
164 1 :
165 : typedef struct sg_device { /* holds the state of each scsi generic device */
166 : struct scsi_device *device;
167 : wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
168 : int sg_tablesize; /* adapter's max scatter-gather table size */
169 : u32 index; /* device index number */
170 : struct list_head sfds;
171 : volatile char detached; /* 0->attached, 1->detached pending removal */
172 : volatile char exclude; /* opened for exclusive access */
173 : char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
174 : struct gendisk *disk;
175 : struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
176 : struct kref d_ref;
177 1 : } Sg_device;
178 :
179 : /* tasklet or soft irq callback */
180 : static void sg_rq_end_io(struct request *rq, int uptodate);
181 : static int sg_start_req(Sg_request *srp, unsigned char *cmd);
182 : static int sg_finish_rem_req(Sg_request * srp);
183 : static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
184 : static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
185 : Sg_request * srp);
186 : static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
187 : const char __user *buf, size_t count, int blocking,
188 : int read_only, int sg_io_owned, Sg_request **o_srp);
189 : static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
190 : unsigned char *cmnd, int timeout, int blocking);
191 : static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
192 : static void sg_remove_scat(Sg_scatter_hold * schp);
193 : static void sg_build_reserve(Sg_fd * sfp, int req_size);
194 : static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
195 : static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
196 : static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
197 : static void sg_remove_sfp(struct kref *);
198 : static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
199 : static Sg_request *sg_add_request(Sg_fd * sfp);
200 : static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
201 : static int sg_res_in_use(Sg_fd * sfp);
202 : static Sg_device *sg_get_dev(int dev);
203 : static void sg_put_dev(Sg_device *sdp);
204 :
205 : #define SZ_SG_HEADER sizeof(struct sg_header)
206 : #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
207 : #define SZ_SG_IOVEC sizeof(sg_iovec_t)
208 : #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
209 :
210 : static int sg_allow_access(struct file *filp, unsigned char *cmd)
211 : {
212 9 : struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
213 3 :
214 9 : if (sfp->parentdp->device->type == TYPE_SCANNER)
215 3 : return 0;
216 :
217 6 : return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
218 : }
219 :
220 : static int
221 : sg_open(struct inode *inode, struct file *filp)
222 : {
223 4 : int dev = iminor(inode);
224 3 : int flags = filp->f_flags;
225 1 : struct request_queue *q;
226 1 : Sg_device *sdp;
227 1 : Sg_fd *sfp;
228 1 : int res;
229 1 : int retval;
230 1 :
231 2 : lock_kernel();
232 2 : nonseekable_open(inode, filp);
233 1 : SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
234 5 : sdp = sg_get_dev(dev);
235 5 : if (IS_ERR(sdp)) {
236 4 : retval = PTR_ERR(sdp);
237 2 : sdp = NULL;
238 2 : goto sg_put;
239 1 : }
240 1 :
241 1 : /* This driver's module count bumped by fops_get in <linux/fs.h> */
242 1 : /* Prevent the device driver from vanishing while we sleep */
243 2 : retval = scsi_device_get(sdp->device);
244 3 : if (retval)
245 2 : goto sg_put;
246 1 :
247 6 : if (!((flags & O_NONBLOCK) ||
248 1 : scsi_block_when_processing_errors(sdp->device))) {
249 2 : retval = -ENXIO;
250 : /* we are in error recovery for this device */
251 1 : goto error_out;
252 : }
253 :
254 2 : if (flags & O_EXCL) {
255 2 : if (O_RDONLY == (flags & O_ACCMODE)) {
256 1 : retval = -EPERM; /* Can't lock it with read only access */
257 1 : goto error_out;
258 : }
259 6 : if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) {
260 1 : retval = -EBUSY;
261 1 : goto error_out;
262 : }
263 1 : res = 0;
264 34 : __wait_event_interruptible(sdp->o_excl_wait,
265 3 : ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
266 5 : if (res) {
267 2 : retval = res; /* -ERESTARTSYS because signal hit process */
268 2 : goto error_out;
269 : }
270 3 : } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
271 2 : if (flags & O_NONBLOCK) {
272 1 : retval = -EBUSY;
273 1 : goto error_out;
274 : }
275 1 : res = 0;
276 25 : __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
277 3 : res);
278 5 : if (res) {
279 2 : retval = res; /* -ERESTARTSYS because signal hit process */
280 2 : goto error_out;
281 : }
282 : }
283 15 : if (sdp->detached) {
284 5 : retval = -ENODEV;
285 5 : goto error_out;
286 : }
287 12 : if (list_empty(&sdp->sfds)) { /* no existing opens on this device */
288 1 : sdp->sgdebug = 0;
289 1 : q = sdp->device->request_queue;
290 12 : sdp->sg_tablesize = min(queue_max_hw_segments(q),
291 : queue_max_phys_segments(q));
292 : }
293 8 : if ((sfp = sg_add_sfp(sdp, dev)))
294 1 : filp->private_data = sfp;
295 : else {
296 2 : if (flags & O_EXCL) {
297 1 : sdp->exclude = 0; /* undo if error */
298 1 : wake_up_interruptible(&sdp->o_excl_wait);
299 : }
300 1 : retval = -ENOMEM;
301 1 : goto error_out;
302 : }
303 1 : retval = 0;
304 1 : error_out:
305 14 : if (retval)
306 7 : scsi_device_put(sdp->device);
307 : sg_put:
308 16 : if (sdp)
309 16 : sg_put_dev(sdp);
310 9 : unlock_kernel();
311 16 : return retval;
312 : }
313 :
314 : /* Following function was formerly called 'sg_close' */
315 : static int
316 : sg_release(struct inode *inode, struct file *filp)
317 : {
318 1 : Sg_device *sdp;
319 1 : Sg_fd *sfp;
320 :
321 7 : if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
322 2 : return -ENXIO;
323 : SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
324 :
325 1 : sfp->closed = 1;
326 :
327 1 : sdp->exclude = 0;
328 1 : wake_up_interruptible(&sdp->o_excl_wait);
329 :
330 1 : kref_put(&sfp->f_ref, sg_remove_sfp);
331 1 : return 0;
332 : }
333 :
334 : static ssize_t
335 : sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
336 : {
337 1 : Sg_device *sdp;
338 1 : Sg_fd *sfp;
339 1 : Sg_request *srp;
340 2 : int req_pack_id = -1;
341 1 : sg_io_hdr_t *hp;
342 2 : struct sg_header *old_hdr = NULL;
343 2 : int retval = 0;
344 1 :
345 8 : if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
346 3 : return -ENXIO;
347 1 : SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
348 1 : sdp->disk->disk_name, (int) count));
349 1 :
350 8 : if (!access_ok(VERIFY_WRITE, buf, count))
351 2 : return -EFAULT;
352 6 : if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
353 4 : old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
354 3 : if (!old_hdr)
355 2 : return -ENOMEM;
356 5 : if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
357 2 : retval = -EFAULT;
358 2 : goto free_old_hdr;
359 1 : }
360 2 : if (old_hdr->reply_len < 0) {
361 2 : if (count >= SZ_SG_IO_HDR) {
362 : sg_io_hdr_t *new_hdr;
363 3 : new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
364 2 : if (!new_hdr) {
365 1 : retval = -ENOMEM;
366 1 : goto free_old_hdr;
367 : }
368 2 : retval =__copy_from_user
369 : (new_hdr, buf, SZ_SG_IO_HDR);
370 1 : req_pack_id = new_hdr->pack_id;
371 1 : kfree(new_hdr);
372 2 : if (retval) {
373 1 : retval = -EFAULT;
374 1 : goto free_old_hdr;
375 : }
376 : }
377 : } else
378 1 : req_pack_id = old_hdr->pack_id;
379 : }
380 6 : srp = sg_get_rq_mark(sfp, req_pack_id);
381 2 : if (!srp) { /* now wait on packet to arrive */
382 3 : if (sdp->detached) {
383 1 : retval = -ENODEV;
384 1 : goto free_old_hdr;
385 : }
386 2 : if (filp->f_flags & O_NONBLOCK) {
387 1 : retval = -EAGAIN;
388 1 : goto free_old_hdr;
389 : }
390 : while (1) {
391 1 : retval = 0; /* following macro beats race condition */
392 32 : __wait_event_interruptible(sfp->read_wait,
393 4 : (sdp->detached ||
394 1 : (srp = sg_get_rq_mark(sfp, req_pack_id))),
395 : retval);
396 9 : if (sdp->detached) {
397 3 : retval = -ENODEV;
398 3 : goto free_old_hdr;
399 : }
400 6 : if (0 == retval)
401 3 : break;
402 :
403 : /* -ERESTARTSYS as signal hit process */
404 3 : goto free_old_hdr;
405 : }
406 3 : }
407 8 : if (srp->header.interface_id != '\0') {
408 9 : retval = sg_new_read(sfp, buf, count, srp);
409 1 : goto free_old_hdr;
410 : }
411 :
412 4 : hp = &srp->header;
413 8 : if (old_hdr == NULL) {
414 9 : old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
415 2 : if (! old_hdr) {
416 1 : retval = -ENOMEM;
417 1 : goto free_old_hdr;
418 : }
419 : }
420 5 : memset(old_hdr, 0, SZ_SG_HEADER);
421 10 : old_hdr->reply_len = (int) hp->timeout;
422 5 : old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
423 5 : old_hdr->pack_id = hp->pack_id;
424 35 : old_hdr->twelve_byte =
425 : ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
426 5 : old_hdr->target_status = hp->masked_status;
427 10 : old_hdr->host_status = hp->host_status;
428 10 : old_hdr->driver_status = hp->driver_status;
429 30 : if ((CHECK_CONDITION & hp->masked_status) ||
430 : (DRIVER_SENSE & hp->driver_status))
431 5 : memcpy(old_hdr->sense_buffer, srp->sense_b,
432 : sizeof (old_hdr->sense_buffer));
433 : switch (hp->host_status) {
434 : /* This setup of 'result' is for backward compatibility and is best
435 : ignored by the user who should use target, host + driver status */
436 20 : case DID_OK:
437 20 : case DID_PASSTHROUGH:
438 20 : case DID_SOFT_ERROR:
439 5 : old_hdr->result = 0;
440 5 : break;
441 25 : case DID_NO_CONNECT:
442 25 : case DID_BUS_BUSY:
443 25 : case DID_TIME_OUT:
444 5 : old_hdr->result = EBUSY;
445 5 : break;
446 25 : case DID_BAD_TARGET:
447 25 : case DID_ABORT:
448 25 : case DID_PARITY:
449 25 : case DID_RESET:
450 25 : case DID_BAD_INTR:
451 5 : old_hdr->result = EIO;
452 5 : break;
453 25 : case DID_ERROR:
454 45 : old_hdr->result = (srp->sense_b[0] == 0 &&
455 : hp->masked_status == GOOD) ? 0 : EIO;
456 5 : break;
457 10 : default:
458 10 : old_hdr->result = EIO;
459 10 : break;
460 5 : }
461 :
462 : /* Now copy the result back to the user buffer. */
463 10 : if (count >= SZ_SG_HEADER) {
464 12 : if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
465 1 : retval = -EFAULT;
466 1 : goto free_old_hdr;
467 : }
468 1 : buf += SZ_SG_HEADER;
469 3 : if (count > old_hdr->reply_len)
470 2 : count = old_hdr->reply_len;
471 2 : if (count > SZ_SG_HEADER) {
472 7 : if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
473 1 : retval = -EFAULT;
474 1 : goto free_old_hdr;
475 : }
476 : }
477 : } else
478 30 : count = (old_hdr->result == 0) ? 0 : -EIO;
479 14 : sg_finish_rem_req(srp);
480 1 : retval = count;
481 : free_old_hdr:
482 13 : kfree(old_hdr);
483 12 : return retval;
484 : }
485 :
486 : static ssize_t
487 : sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
488 : {
489 10 : sg_io_hdr_t *hp = &srp->header;
490 10 : int err = 0;
491 5 : int len;
492 5 :
493 15 : if (count < SZ_SG_IO_HDR) {
494 10 : err = -EINVAL;
495 5 : goto err_out;
496 : }
497 5 : hp->sb_len_wr = 0;
498 30 : if ((hp->mx_sb_len > 0) && hp->sbp) {
499 30 : if ((CHECK_CONDITION & hp->masked_status) ||
500 : (DRIVER_SENSE & hp->driver_status)) {
501 5 : int sb_len = SCSI_SENSE_BUFFERSIZE;
502 40 : sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
503 5 : len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
504 30 : len = (len > sb_len) ? sb_len : len;
505 20 : if (copy_to_user(hp->sbp, srp->sense_b, len)) {
506 5 : err = -EFAULT;
507 5 : goto err_out;
508 : }
509 5 : hp->sb_len_wr = len;
510 : }
511 : }
512 20 : if (hp->masked_status || hp->host_status || hp->driver_status)
513 10 : hp->info |= SG_INFO_CHECK;
514 30 : if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
515 5 : err = -EFAULT;
516 5 : goto err_out;
517 : }
518 : err_out:
519 30 : err = sg_finish_rem_req(srp);
520 35 : return (0 == err) ? count : err;
521 : }
522 :
523 : static ssize_t
524 : sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
525 : {
526 1 : int mxsize, cmd_size, k;
527 1 : int input_size, blocking;
528 1 : unsigned char opcode;
529 1 : Sg_device *sdp;
530 1 : Sg_fd *sfp;
531 1 : Sg_request *srp;
532 1 : struct sg_header old_hdr;
533 1 : sg_io_hdr_t *hp;
534 1 : unsigned char cmnd[MAX_COMMAND_SIZE];
535 1 :
536 8 : if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
537 3 : return -ENXIO;
538 1 : SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
539 1 : sdp->disk->disk_name, (int) count));
540 4 : if (sdp->detached)
541 2 : return -ENODEV;
542 6 : if (!((filp->f_flags & O_NONBLOCK) ||
543 1 : scsi_block_when_processing_errors(sdp->device)))
544 2 : return -ENXIO;
545 1 :
546 8 : if (!access_ok(VERIFY_READ, buf, count))
547 2 : return -EFAULT; /* protects following copy_from_user()s + get_user()s */
548 3 : if (count < SZ_SG_HEADER)
549 2 : return -EIO;
550 5 : if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
551 2 : return -EFAULT;
552 2 : blocking = !(filp->f_flags & O_NONBLOCK);
553 3 : if (old_hdr.reply_len < 0)
554 16 : return sg_new_write(sfp, filp, buf, count,
555 : blocking, 0, 0, NULL);
556 2 : if (count < (SZ_SG_HEADER + 6))
557 1 : return -EIO; /* The minimum scsi command length is 6 bytes. */
558 :
559 6 : if (!(srp = sg_add_request(sfp))) {
560 : SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
561 1 : return -EDOM;
562 : }
563 1 : buf += SZ_SG_HEADER;
564 6 : __get_user(opcode, buf);
565 4 : if (sfp->next_cmd_len > 0) {
566 3 : if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
567 : SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
568 1 : sfp->next_cmd_len = 0;
569 3 : sg_remove_request(sfp, srp);
570 1 : return -EIO;
571 : }
572 2 : cmd_size = sfp->next_cmd_len;
573 1 : sfp->next_cmd_len = 0; /* reset so only this write() effected */
574 : } else {
575 1 : cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
576 4 : if ((opcode >= 0xc0) && old_hdr.twelve_byte)
577 1 : cmd_size = 12;
578 : }
579 : SCSI_LOG_TIMEOUT(4, printk(
580 : "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
581 : /* Determine buffer size. */
582 1 : input_size = count - cmd_size;
583 6 : mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
584 1 : mxsize -= SZ_SG_HEADER;
585 1 : input_size -= SZ_SG_HEADER;
586 2 : if (input_size < 0) {
587 3 : sg_remove_request(sfp, srp);
588 1 : return -EIO; /* User did not pass enough bytes for this command. */
589 : }
590 1 : hp = &srp->header;
591 1 : hp->interface_id = '\0'; /* indicator of old interface tunnelled */
592 1 : hp->cmd_len = (unsigned char) cmd_size;
593 1 : hp->iovec_count = 0;
594 1 : hp->mx_sb_len = 0;
595 2 : if (input_size > 0)
596 6 : hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
597 : SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
598 : else
599 6 : hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
600 1 : hp->dxfer_len = mxsize;
601 2 : if (hp->dxfer_direction == SG_DXFER_TO_DEV)
602 1 : hp->dxferp = (char __user *)buf + cmd_size;
603 : else
604 1 : hp->dxferp = NULL;
605 1 : hp->sbp = NULL;
606 1 : hp->timeout = old_hdr.reply_len; /* structure abuse ... */
607 1 : hp->flags = input_size; /* structure abuse ... */
608 1 : hp->pack_id = old_hdr.pack_id;
609 1 : hp->usr_ptr = NULL;
610 4 : if (__copy_from_user(cmnd, buf, cmd_size))
611 1 : return -EFAULT;
612 : /*
613 : * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
614 : * but is is possible that the app intended SG_DXFER_TO_DEV, because there
615 : * is a non-zero input_size, so emit a warning.
616 : */
617 2 : if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
618 : static char cmd[TASK_COMM_LEN];
619 8 : if (strcmp(current->comm, cmd) && printk_ratelimit()) {
620 3 : printk(KERN_WARNING
621 : "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
622 : "guessing data in;\n "
623 : "program %s not setting count and/or reply_len properly\n",
624 : old_hdr.reply_len - (int)SZ_SG_HEADER,
625 : input_size, (unsigned int) cmnd[0],
626 : current->comm);
627 3 : strcpy(cmd, current->comm);
628 : }
629 : }
630 12 : k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
631 6 : return (k < 0) ? k : count;
632 : }
633 :
634 : static ssize_t
635 : sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
636 : size_t count, int blocking, int read_only, int sg_io_owned,
637 : Sg_request **o_srp)
638 2 : {
639 2 : int k;
640 2 : Sg_request *srp;
641 2 : sg_io_hdr_t *hp;
642 2 : unsigned char cmnd[MAX_COMMAND_SIZE];
643 2 : int timeout;
644 2 : unsigned long ul_timeout;
645 2 :
646 6 : if (count < SZ_SG_IO_HDR)
647 4 : return -EINVAL;
648 16 : if (!access_ok(VERIFY_READ, buf, count))
649 4 : return -EFAULT; /* protects following copy_from_user()s + get_user()s */
650 2 :
651 4 : sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
652 14 : if (!(srp = sg_add_request(sfp))) {
653 2 : SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
654 4 : return -EDOM;
655 2 : }
656 2 : srp->sg_io_owned = sg_io_owned;
657 2 : hp = &srp->header;
658 8 : if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
659 6 : sg_remove_request(sfp, srp);
660 2 : return -EFAULT;
661 : }
662 4 : if (hp->interface_id != 'S') {
663 6 : sg_remove_request(sfp, srp);
664 2 : return -ENOSYS;
665 : }
666 4 : if (hp->flags & SG_FLAG_MMAP_IO) {
667 4 : if (hp->dxfer_len > sfp->reserve.bufflen) {
668 6 : sg_remove_request(sfp, srp);
669 2 : return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
670 : }
671 6 : if (hp->flags & SG_FLAG_DIRECT_IO) {
672 6 : sg_remove_request(sfp, srp);
673 2 : return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
674 : }
675 8 : if (sg_res_in_use(sfp)) {
676 6 : sg_remove_request(sfp, srp);
677 2 : return -EBUSY; /* reserve buffer already being used */
678 : }
679 : }
680 4 : ul_timeout = msecs_to_jiffies(srp->header.timeout);
681 24 : timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
682 36 : if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
683 12 : sg_remove_request(sfp, srp);
684 2 : return -EMSGSIZE;
685 : }
686 18 : if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
687 6 : sg_remove_request(sfp, srp);
688 2 : return -EFAULT; /* protects following copy_from_user()s + get_user()s */
689 : }
690 12 : if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
691 6 : sg_remove_request(sfp, srp);
692 2 : return -EFAULT;
693 : }
694 12 : if (read_only && sg_allow_access(file, cmnd)) {
695 6 : sg_remove_request(sfp, srp);
696 2 : return -EPERM;
697 : }
698 16 : k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
699 4 : if (k < 0)
700 2 : return k;
701 4 : if (o_srp)
702 2 : *o_srp = srp;
703 2 : return count;
704 : }
705 :
706 : static int
707 : sg_common_write(Sg_fd * sfp, Sg_request * srp,
708 : unsigned char *cmnd, int timeout, int blocking)
709 : {
710 7 : int k, data_dir;
711 14 : Sg_device *sdp = sfp->parentdp;
712 14 : sg_io_hdr_t *hp = &srp->header;
713 7 :
714 7 : srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
715 7 : hp->status = 0;
716 7 : hp->masked_status = 0;
717 7 : hp->msg_status = 0;
718 7 : hp->info = 0;
719 7 : hp->host_status = 0;
720 7 : hp->driver_status = 0;
721 7 : hp->resid = 0;
722 : SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
723 : (int) cmnd[0], (int) hp->cmd_len));
724 :
725 56 : k = sg_start_req(srp, cmnd);
726 14 : if (k) {
727 : SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
728 14 : sg_finish_rem_req(srp);
729 7 : return k; /* probably out of space --> ENOMEM */
730 : }
731 21 : if (sdp->detached) {
732 14 : sg_finish_rem_req(srp);
733 7 : return -ENODEV;
734 : }
735 :
736 : switch (hp->dxfer_direction) {
737 21 : case SG_DXFER_TO_FROM_DEV:
738 21 : case SG_DXFER_FROM_DEV:
739 7 : data_dir = DMA_FROM_DEVICE;
740 7 : break;
741 28 : case SG_DXFER_TO_DEV:
742 7 : data_dir = DMA_TO_DEVICE;
743 7 : break;
744 28 : case SG_DXFER_UNKNOWN:
745 7 : data_dir = DMA_BIDIRECTIONAL;
746 7 : break;
747 14 : default:
748 14 : data_dir = DMA_NONE;
749 14 : break;
750 : }
751 7 : hp->duration = jiffies_to_msecs(jiffies);
752 :
753 7 : srp->rq->timeout = timeout;
754 7 : kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
755 7 : blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
756 : srp->rq, 1, sg_rq_end_io);
757 7 : return 0;
758 : }
759 :
760 : static int
761 : sg_ioctl(struct inode *inode, struct file *filp,
762 : unsigned int cmd_in, unsigned long arg)
763 : {
764 2 : void __user *p = (void __user *)arg;
765 2 : int __user *ip = p;
766 1 : int result, val, read_only;
767 1 : Sg_device *sdp;
768 1 : Sg_fd *sfp;
769 1 : Sg_request *srp;
770 1 : unsigned long iflags;
771 1 :
772 8 : if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
773 3 : return -ENXIO;
774 1 :
775 1 : SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
776 1 : sdp->disk->disk_name, (int) cmd_in));
777 2 : read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
778 1 :
779 1 : switch (cmd_in) {
780 4 : case SG_IO:
781 1 : {
782 2 : int blocking = 1; /* ignore O_NONBLOCK flag */
783 1 :
784 4 : if (sdp->detached)
785 2 : return -ENODEV;
786 4 : if (!scsi_block_when_processing_errors(sdp->device))
787 2 : return -ENXIO;
788 8 : if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
789 2 : return -EFAULT;
790 16 : result =
791 1 : sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
792 1 : blocking, read_only, 1, &srp);
793 3 : if (result < 0)
794 2 : return result;
795 1 : while (1) {
796 2 : result = 0; /* following macro to beat race condition */
797 29 : __wait_event_interruptible(sfp->read_wait,
798 5 : (srp->done || sdp->detached),
799 2 : result);
800 7 : if (sdp->detached)
801 3 : return -ENODEV;
802 3 : write_lock_irq(&sfp->rq_list_lock);
803 7 : if (srp->done) {
804 3 : srp->done = 2;
805 5 : write_unlock_irq(&sfp->rq_list_lock);
806 2 : break;
807 1 : }
808 3 : srp->orphan = 1;
809 5 : write_unlock_irq(&sfp->rq_list_lock);
810 2 : return result; /* -ERESTARTSYS because signal hit process */
811 1 : }
812 5 : result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
813 7 : return (result < 0) ? result : 0;
814 2 : }
815 4 : case SG_SET_TIMEOUT:
816 11 : result = get_user(val, ip);
817 4 : if (result)
818 2 : return result;
819 3 : if (val < 0)
820 2 : return -EIO;
821 3 : if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
822 2 : val = MULDIV (INT_MAX, USER_HZ, HZ);
823 2 : sfp->timeout_user = val;
824 2 : sfp->timeout = MULDIV (val, HZ, USER_HZ);
825 1 :
826 2 : return 0;
827 5 : case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
828 1 : /* strange ..., for backward compatibility */
829 2 : return sfp->timeout_user;
830 5 : case SG_SET_FORCE_LOW_DMA:
831 11 : result = get_user(val, ip);
832 4 : if (result)
833 2 : return result;
834 3 : if (val) {
835 2 : sfp->low_dma = 1;
836 8 : if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
837 2 : val = (int) sfp->reserve.bufflen;
838 4 : sg_remove_scat(&sfp->reserve);
839 4 : sg_build_reserve(sfp, val);
840 1 : }
841 1 : } else {
842 4 : if (sdp->detached)
843 2 : return -ENODEV;
844 3 : sfp->low_dma = sdp->device->host->unchecked_isa_dma;
845 1 : }
846 4 : return 0;
847 5 : case SG_GET_LOW_DMA:
848 12 : return put_user((int) sfp->low_dma, ip);
849 6 : case SG_GET_SCSI_ID:
850 8 : if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
851 2 : return -EFAULT;
852 1 : else {
853 2 : sg_scsi_id_t __user *sg_idp = p;
854 1 :
855 4 : if (sdp->detached)
856 2 : return -ENODEV;
857 8 : __put_user((int) sdp->device->host->host_no,
858 2 : &sg_idp->host_no);
859 8 : __put_user((int) sdp->device->channel,
860 2 : &sg_idp->channel);
861 8 : __put_user((int) sdp->device->id, &sg_idp->scsi_id);
862 9 : __put_user((int) sdp->device->lun, &sg_idp->lun);
863 9 : __put_user((int) sdp->device->type, &sg_idp->scsi_type);
864 8 : __put_user((short) sdp->device->host->cmd_per_lun,
865 2 : &sg_idp->h_cmd_per_lun);
866 7 : __put_user((short) sdp->device->queue_depth,
867 2 : &sg_idp->d_queue_depth);
868 8 : __put_user(0, &sg_idp->unused[0]);
869 9 : __put_user(0, &sg_idp->unused[1]);
870 3 : return 0;
871 : }
872 4 : case SG_SET_FORCE_PACK_ID:
873 10 : result = get_user(val, ip);
874 3 : if (result)
875 1 : return result;
876 1 : sfp->force_packid = val ? 1 : 0;
877 1 : return 0;
878 4 : case SG_GET_PACK_ID:
879 7 : if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
880 1 : return -EFAULT;
881 1 : read_lock_irqsave(&sfp->rq_list_lock, iflags);
882 5 : for (srp = sfp->headrp; srp; srp = srp->nextrp) {
883 8 : if ((1 == srp->done) && (!srp->sg_io_owned)) {
884 2 : read_unlock_irqrestore(&sfp->rq_list_lock,
885 : iflags);
886 7 : __put_user(srp->header.pack_id, ip);
887 2 : return 0;
888 : }
889 : }
890 1 : read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
891 7 : __put_user(-1, ip);
892 2 : return 0;
893 4 : case SG_GET_NUM_WAITING:
894 1 : read_lock_irqsave(&sfp->rq_list_lock, iflags);
895 6 : for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
896 8 : if ((1 == srp->done) && (!srp->sg_io_owned))
897 2 : ++val;
898 : }
899 1 : read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
900 10 : return put_user(val, ip);
901 5 : case SG_GET_SG_TABLESIZE:
902 10 : return put_user(sdp->sg_tablesize, ip);
903 5 : case SG_SET_RESERVED_SIZE:
904 10 : result = get_user(val, ip);
905 3 : if (result)
906 1 : return result;
907 2 : if (val < 0)
908 1 : return -EINVAL;
909 10 : val = min_t(int, val,
910 : queue_max_sectors(sdp->device->request_queue) * 512);
911 2 : if (val != sfp->reserve.bufflen) {
912 7 : if (sg_res_in_use(sfp) || sfp->mmap_called)
913 1 : return -EBUSY;
914 3 : sg_remove_scat(&sfp->reserve);
915 3 : sg_build_reserve(sfp, val);
916 : }
917 2 : return 0;
918 4 : case SG_GET_RESERVED_SIZE:
919 10 : val = min_t(int, sfp->reserve.bufflen,
920 : queue_max_sectors(sdp->device->request_queue) * 512);
921 10 : return put_user(val, ip);
922 5 : case SG_SET_COMMAND_Q:
923 10 : result = get_user(val, ip);
924 3 : if (result)
925 1 : return result;
926 1 : sfp->cmd_q = val ? 1 : 0;
927 1 : return 0;
928 4 : case SG_GET_COMMAND_Q:
929 11 : return put_user((int) sfp->cmd_q, ip);
930 5 : case SG_SET_KEEP_ORPHAN:
931 10 : result = get_user(val, ip);
932 3 : if (result)
933 1 : return result;
934 1 : sfp->keep_orphan = val;
935 1 : return 0;
936 4 : case SG_GET_KEEP_ORPHAN:
937 11 : return put_user((int) sfp->keep_orphan, ip);
938 5 : case SG_NEXT_CMD_LEN:
939 10 : result = get_user(val, ip);
940 3 : if (result)
941 1 : return result;
942 6 : sfp->next_cmd_len = (val > 0) ? val : 0;
943 1 : return 0;
944 4 : case SG_GET_VERSION_NUM:
945 10 : return put_user(sg_version_num, ip);
946 5 : case SG_GET_ACCESS_COUNT:
947 : /* faked - we don't have a real access count anymore */
948 2 : val = (sdp->device ? 1 : 0);
949 10 : return put_user(val, ip);
950 5 : case SG_GET_REQUEST_TABLE:
951 7 : if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
952 1 : return -EFAULT;
953 : else {
954 : sg_req_info_t *rinfo;
955 : unsigned int ms;
956 :
957 3 : rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
958 : GFP_KERNEL);
959 2 : if (!rinfo)
960 1 : return -ENOMEM;
961 1 : read_lock_irqsave(&sfp->rq_list_lock, iflags);
962 5 : for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
963 8 : ++val, srp = srp ? srp->nextrp : srp) {
964 3 : memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
965 2 : if (srp) {
966 2 : rinfo[val].req_state = srp->done + 1;
967 1 : rinfo[val].problem =
968 : srp->header.masked_status &
969 : srp->header.host_status &
970 : srp->header.driver_status;
971 3 : if (srp->done)
972 1 : rinfo[val].duration =
973 : srp->header.duration;
974 : else {
975 1 : ms = jiffies_to_msecs(jiffies);
976 6 : rinfo[val].duration =
977 : (ms > srp->header.duration) ?
978 : (ms - srp->header.duration) : 0;
979 : }
980 1 : rinfo[val].orphan = srp->orphan;
981 1 : rinfo[val].sg_io_owned =
982 : srp->sg_io_owned;
983 1 : rinfo[val].pack_id =
984 : srp->header.pack_id;
985 1 : rinfo[val].usr_ptr =
986 : srp->header.usr_ptr;
987 : }
988 : }
989 1 : read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
990 2 : result = __copy_to_user(p, rinfo,
991 : SZ_SG_REQ_INFO * SG_MAX_QUEUE);
992 6 : result = result ? -EFAULT : 0;
993 1 : kfree(rinfo);
994 1 : return result;
995 : }
996 4 : case SG_EMULATED_HOST:
997 3 : if (sdp->detached)
998 1 : return -ENODEV;
999 11 : return put_user(sdp->device->host->hostt->emulated, ip);
1000 5 : case SG_SCSI_RESET:
1001 3 : if (sdp->detached)
1002 1 : return -ENODEV;
1003 2 : if (filp->f_flags & O_NONBLOCK) {
1004 4 : if (scsi_host_in_recovery(sdp->device->host))
1005 1 : return -EBUSY;
1006 3 : } else if (!scsi_block_when_processing_errors(sdp->device))
1007 1 : return -EBUSY;
1008 12 : result = get_user(val, ip);
1009 3 : if (result)
1010 1 : return result;
1011 2 : if (SG_SCSI_RESET_NOTHING == val)
1012 1 : return 0;
1013 : switch (val) {
1014 3 : case SG_SCSI_RESET_DEVICE:
1015 1 : val = SCSI_TRY_RESET_DEVICE;
1016 1 : break;
1017 4 : case SG_SCSI_RESET_TARGET:
1018 1 : val = SCSI_TRY_RESET_TARGET;
1019 1 : break;
1020 4 : case SG_SCSI_RESET_BUS:
1021 1 : val = SCSI_TRY_RESET_BUS;
1022 1 : break;
1023 4 : case SG_SCSI_RESET_HOST:
1024 1 : val = SCSI_TRY_RESET_HOST;
1025 1 : break;
1026 2 : default:
1027 2 : return -EINVAL;
1028 : }
1029 6 : if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1030 2 : return -EACCES;
1031 7 : return (scsi_reset_provider(sdp->device, val) ==
1032 1 : SUCCESS) ? 0 : -EIO;
1033 3 : case SCSI_IOCTL_SEND_COMMAND:
1034 3 : if (sdp->detached)
1035 1 : return -ENODEV;
1036 2 : if (read_only) {
1037 1 : unsigned char opcode = WRITE_6;
1038 1 : Scsi_Ioctl_Command __user *siocp = p;
1039 :
1040 5 : if (copy_from_user(&opcode, siocp->data, 1))
1041 1 : return -EFAULT;
1042 4 : if (sg_allow_access(filp, &opcode))
1043 1 : return -EPERM;
1044 : }
1045 4 : return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1046 4 : case SG_SET_DEBUG:
1047 10 : result = get_user(val, ip);
1048 3 : if (result)
1049 1 : return result;
1050 1 : sdp->sgdebug = (char) val;
1051 1 : return 0;
1052 4 : case SCSI_IOCTL_GET_IDLUN:
1053 4 : case SCSI_IOCTL_GET_BUS_NUMBER:
1054 4 : case SCSI_IOCTL_PROBE_HOST:
1055 4 : case SG_GET_TRANSFORM:
1056 3 : if (sdp->detached)
1057 1 : return -ENODEV;
1058 2 : return scsi_ioctl(sdp->device, cmd_in, p);
1059 4 : case BLKSECTGET:
1060 12 : return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
1061 2 : ip);
1062 3 : case BLKTRACESETUP:
1063 1 : return blk_trace_setup(sdp->device->request_queue,
1064 1 : sdp->disk->disk_name,
1065 : MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1066 : NULL,
1067 : (char *)arg);
1068 3 : case BLKTRACESTART:
1069 1 : return blk_trace_startstop(sdp->device->request_queue, 1);
1070 4 : case BLKTRACESTOP:
1071 1 : return blk_trace_startstop(sdp->device->request_queue, 0);
1072 4 : case BLKTRACETEARDOWN:
1073 1 : return blk_trace_remove(sdp->device->request_queue);
1074 2 : default:
1075 3 : if (read_only)
1076 1 : return -EPERM; /* don't know so take safe approach */
1077 2 : return scsi_ioctl(sdp->device, cmd_in, p);
1078 : }
1079 : }
1080 :
1081 : #ifdef CONFIG_COMPAT
1082 : static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1083 : {
1084 1 : Sg_device *sdp;
1085 1 : Sg_fd *sfp;
1086 1 : struct scsi_device *sdev;
1087 1 :
1088 7 : if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1089 2 : return -ENXIO;
1090 :
1091 1 : sdev = sdp->device;
1092 3 : if (sdev->host->hostt->compat_ioctl) {
1093 : int ret;
1094 :
1095 1 : ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1096 :
1097 1 : return ret;
1098 : }
1099 :
1100 1 : return -ENOIOCTLCMD;
1101 : }
1102 : #endif
1103 :
1104 : static unsigned int
1105 : sg_poll(struct file *filp, poll_table * wait)
1106 : {
1107 2 : unsigned int res = 0;
1108 1 : Sg_device *sdp;
1109 1 : Sg_fd *sfp;
1110 1 : Sg_request *srp;
1111 2 : int count = 0;
1112 1 : unsigned long iflags;
1113 :
1114 10 : if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1115 : || sfp->closed)
1116 3 : return POLLERR;
1117 2 : poll_wait(filp, &sfp->read_wait, wait);
1118 1 : read_lock_irqsave(&sfp->rq_list_lock, iflags);
1119 5 : for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1120 2 : /* if any read waiting, flag it */
1121 9 : if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1122 1 : res = POLLIN | POLLRDNORM;
1123 1 : ++count;
1124 : }
1125 1 : read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1126 :
1127 3 : if (sdp->detached)
1128 1 : res |= POLLHUP;
1129 3 : else if (!sfp->cmd_q) {
1130 2 : if (0 == count)
1131 1 : res |= POLLOUT | POLLWRNORM;
1132 2 : } else if (count < SG_MAX_QUEUE)
1133 1 : res |= POLLOUT | POLLWRNORM;
1134 : SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1135 : sdp->disk->disk_name, (int) res));
1136 1 : return res;
1137 : }
1138 :
1139 : static int
1140 : sg_fasync(int fd, struct file *filp, int mode)
1141 : {
1142 1 : Sg_device *sdp;
1143 1 : Sg_fd *sfp;
1144 1 :
1145 7 : if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1146 2 : return -ENXIO;
1147 : SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1148 : sdp->disk->disk_name, mode));
1149 :
1150 2 : return fasync_helper(fd, filp, mode, &sfp->async_qp);
1151 : }
1152 :
1153 : static int
1154 : sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1155 : {
1156 1 : Sg_fd *sfp;
1157 1 : unsigned long offset, len, sa;
1158 1 : Sg_scatter_hold *rsv_schp;
1159 1 : int k, length;
1160 1 :
1161 7 : if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1162 3 : return VM_FAULT_SIGBUS;
1163 2 : rsv_schp = &sfp->reserve;
1164 2 : offset = vmf->pgoff << PAGE_SHIFT;
1165 4 : if (offset >= rsv_schp->bufflen)
1166 2 : return VM_FAULT_SIGBUS;
1167 1 : SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1168 1 : offset, rsv_schp->k_use_sg));
1169 2 : sa = vma->vm_start;
1170 2 : length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1171 9 : for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1172 4 : len = vma->vm_end - sa;
1173 7 : len = (len < length) ? len : length;
1174 2 : if (offset < len) {
1175 15 : struct page *page = nth_page(rsv_schp->pages[k],
1176 : offset >> PAGE_SHIFT);
1177 2 : get_page(page); /* increment page count */
1178 1 : vmf->page = page;
1179 1 : return 0; /* success */
1180 : }
1181 1 : sa += len;
1182 1 : offset -= len;
1183 : }
1184 :
1185 1 : return VM_FAULT_SIGBUS;
1186 : }
1187 :
1188 1 : static const struct vm_operations_struct sg_mmap_vm_ops = {
1189 : .fault = sg_vma_fault,
1190 : };
1191 :
1192 : static int
1193 : sg_mmap(struct file *filp, struct vm_area_struct *vma)
1194 : {
1195 1 : Sg_fd *sfp;
1196 1 : unsigned long req_sz, len, sa;
1197 1 : Sg_scatter_hold *rsv_schp;
1198 1 : int k, length;
1199 1 :
1200 9 : if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1201 3 : return -ENXIO;
1202 1 : req_sz = vma->vm_end - vma->vm_start;
1203 : SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1204 : (void *) vma->vm_start, (int) req_sz));
1205 2 : if (vma->vm_pgoff)
1206 1 : return -EINVAL; /* want no offset */
1207 1 : rsv_schp = &sfp->reserve;
1208 3 : if (req_sz > rsv_schp->bufflen)
1209 1 : return -ENOMEM; /* cannot map more than reserved buffer */
1210 :
1211 1 : sa = vma->vm_start;
1212 1 : length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1213 8 : for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1214 3 : len = vma->vm_end - sa;
1215 7 : len = (len < length) ? len : length;
1216 1 : sa += len;
1217 : }
1218 :
1219 1 : sfp->mmap_called = 1;
1220 1 : vma->vm_flags |= VM_RESERVED;
1221 1 : vma->vm_private_data = sfp;
1222 1 : vma->vm_ops = &sg_mmap_vm_ops;
1223 1 : return 0;
1224 : }
1225 :
1226 : static void sg_rq_end_io_usercontext(struct work_struct *work)
1227 : {
1228 0 : struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1229 0 : struct sg_fd *sfp = srp->parentfp;
1230 0 :
1231 0 : sg_finish_rem_req(srp);
1232 0 : kref_put(&sfp->f_ref, sg_remove_sfp);
1233 0 : }
1234 :
1235 : /*
1236 : * This function is a "bottom half" handler that is called by the mid
1237 : * level when a command is completed (or has failed).
1238 : */
1239 : static void sg_rq_end_io(struct request *rq, int uptodate)
1240 : {
1241 0 : struct sg_request *srp = rq->end_io_data;
1242 0 : Sg_device *sdp;
1243 0 : Sg_fd *sfp;
1244 0 : unsigned long iflags;
1245 0 : unsigned int ms;
1246 0 : char *sense;
1247 0 : int result, resid, done = 1;
1248 0 :
1249 0 : if (WARN_ON(srp->done != 0))
1250 0 : return;
1251 0 :
1252 0 : sfp = srp->parentfp;
1253 0 : if (WARN_ON(sfp == NULL))
1254 0 : return;
1255 0 :
1256 0 : sdp = sfp->parentdp;
1257 0 : if (unlikely(sdp->detached))
1258 0 : printk(KERN_INFO "sg_rq_end_io: device detached\n");
1259 0 :
1260 0 : sense = rq->sense;
1261 0 : result = rq->errors;
1262 0 : resid = rq->resid_len;
1263 :
1264 : SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1265 : sdp->disk->disk_name, srp->header.pack_id, result));
1266 0 : srp->header.resid = resid;
1267 0 : ms = jiffies_to_msecs(jiffies);
1268 0 : srp->header.duration = (ms > srp->header.duration) ?
1269 : (ms - srp->header.duration) : 0;
1270 0 : if (0 != result) {
1271 : struct scsi_sense_hdr sshdr;
1272 :
1273 0 : srp->header.status = 0xff & result;
1274 0 : srp->header.masked_status = status_byte(result);
1275 0 : srp->header.msg_status = msg_byte(result);
1276 0 : srp->header.host_status = host_byte(result);
1277 0 : srp->header.driver_status = driver_byte(result);
1278 0 : if ((sdp->sgdebug > 0) &&
1279 : ((CHECK_CONDITION == srp->header.masked_status) ||
1280 : (COMMAND_TERMINATED == srp->header.masked_status)))
1281 0 : __scsi_print_sense("sg_cmd_done", sense,
1282 : SCSI_SENSE_BUFFERSIZE);
1283 :
1284 : /* Following if statement is a patch supplied by Eric Youngdale */
1285 0 : if (driver_byte(result) != 0
1286 : && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1287 : && !scsi_sense_is_deferred(&sshdr)
1288 : && sshdr.sense_key == UNIT_ATTENTION
1289 : && sdp->device->removable) {
1290 : /* Detected possible disc change. Set the bit - this */
1291 : /* may be used if there are filesystems using this device */
1292 0 : sdp->device->changed = 1;
1293 : }
1294 : }
1295 : /* Rely on write phase to clean out srp status values, so no "else" */
1296 :
1297 0 : write_lock_irqsave(&sfp->rq_list_lock, iflags);
1298 0 : if (unlikely(srp->orphan)) {
1299 0 : if (sfp->keep_orphan)
1300 0 : srp->sg_io_owned = 0;
1301 : else
1302 0 : done = 0;
1303 : }
1304 0 : srp->done = done;
1305 0 : write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1306 :
1307 0 : if (likely(done)) {
1308 : /* Now wake up any sg_read() that is waiting for this
1309 : * packet.
1310 : */
1311 0 : wake_up_interruptible(&sfp->read_wait);
1312 0 : kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1313 0 : kref_put(&sfp->f_ref, sg_remove_sfp);
1314 : } else {
1315 0 : INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1316 0 : schedule_work(&srp->ew.work);
1317 : }
1318 0 : }
1319 :
1320 1 : static const struct file_operations sg_fops = {
1321 : .owner = THIS_MODULE,
1322 : .read = sg_read,
1323 : .write = sg_write,
1324 : .poll = sg_poll,
1325 : .ioctl = sg_ioctl,
1326 : #ifdef CONFIG_COMPAT
1327 : .compat_ioctl = sg_compat_ioctl,
1328 : #endif
1329 : .open = sg_open,
1330 : .mmap = sg_mmap,
1331 : .release = sg_release,
1332 : .fasync = sg_fasync,
1333 : };
1334 :
1335 1 : static struct class *sg_sysfs_class;
1336 :
1337 1 : static int sg_sysfs_valid = 0;
1338 :
1339 : static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1340 : {
1341 2 : struct request_queue *q = scsidp->request_queue;
1342 1 : Sg_device *sdp;
1343 1 : unsigned long iflags;
1344 1 : int error;
1345 1 : u32 k;
1346 1 :
1347 4 : sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1348 3 : if (!sdp) {
1349 2 : printk(KERN_WARNING "kmalloc Sg_device failure\n");
1350 4 : return ERR_PTR(-ENOMEM);
1351 1 : }
1352 1 :
1353 4 : if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1354 2 : printk(KERN_WARNING "idr expansion Sg_device failure\n");
1355 2 : error = -ENOMEM;
1356 2 : goto out;
1357 1 : }
1358 :
1359 1 : write_lock_irqsave(&sg_index_lock, iflags);
1360 :
1361 1 : error = idr_get_new(&sg_index_idr, sdp, &k);
1362 2 : if (error) {
1363 1 : write_unlock_irqrestore(&sg_index_lock, iflags);
1364 1 : printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1365 : error);
1366 1 : goto out;
1367 : }
1368 :
1369 4 : if (unlikely(k >= SG_MAX_DEVS))
1370 1 : goto overflow;
1371 :
1372 : SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1373 1 : sprintf(disk->disk_name, "sg%d", k);
1374 1 : disk->first_minor = k;
1375 1 : sdp->disk = disk;
1376 1 : sdp->device = scsidp;
1377 2 : INIT_LIST_HEAD(&sdp->sfds);
1378 1 : init_waitqueue_head(&sdp->o_excl_wait);
1379 12 : sdp->sg_tablesize = min(queue_max_hw_segments(q),
1380 : queue_max_phys_segments(q));
1381 1 : sdp->index = k;
1382 1 : kref_init(&sdp->d_ref);
1383 :
1384 1 : write_unlock_irqrestore(&sg_index_lock, iflags);
1385 :
1386 1 : error = 0;
1387 : out:
1388 7 : if (error) {
1389 3 : kfree(sdp);
1390 7 : return ERR_PTR(error);
1391 : }
1392 3 : return sdp;
1393 1 :
1394 : overflow:
1395 1 : idr_remove(&sg_index_idr, k);
1396 1 : write_unlock_irqrestore(&sg_index_lock, iflags);
1397 5 : sdev_printk(KERN_WARNING, scsidp,
1398 : "Unable to attach sg device type=%d, minor "
1399 : "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1400 1 : error = -ENODEV;
1401 1 : goto out;
1402 : }
1403 :
1404 : static int
1405 : sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1406 : {
1407 4 : struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1408 1 : struct gendisk *disk;
1409 2 : Sg_device *sdp = NULL;
1410 2 : struct cdev * cdev = NULL;
1411 1 : int error;
1412 1 : unsigned long iflags;
1413 1 :
1414 2 : disk = alloc_disk(1);
1415 3 : if (!disk) {
1416 2 : printk(KERN_WARNING "alloc_disk failed\n");
1417 2 : return -ENOMEM;
1418 1 : }
1419 2 : disk->major = SCSI_GENERIC_MAJOR;
1420 1 :
1421 1 : error = -ENOMEM;
1422 1 : cdev = cdev_alloc();
1423 2 : if (!cdev) {
1424 1 : printk(KERN_WARNING "cdev_alloc failed\n");
1425 1 : goto out;
1426 : }
1427 1 : cdev->owner = THIS_MODULE;
1428 1 : cdev->ops = &sg_fops;
1429 :
1430 6 : sdp = sg_alloc(disk, scsidp);
1431 4 : if (IS_ERR(sdp)) {
1432 1 : printk(KERN_WARNING "sg_alloc failed\n");
1433 3 : error = PTR_ERR(sdp);
1434 1 : goto out;
1435 : }
1436 :
1437 1 : error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1438 2 : if (error)
1439 1 : goto cdev_add_err;
1440 :
1441 1 : sdp->cdev = cdev;
1442 2 : if (sg_sysfs_valid) {
1443 : struct device *sg_class_member;
1444 :
1445 1 : sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1446 : MKDEV(SCSI_GENERIC_MAJOR,
1447 : sdp->index),
1448 : sdp, "%s", disk->disk_name);
1449 4 : if (IS_ERR(sg_class_member)) {
1450 1 : printk(KERN_ERR "sg_add: "
1451 : "device_create failed\n");
1452 3 : error = PTR_ERR(sg_class_member);
1453 1 : goto cdev_add_err;
1454 : }
1455 1 : error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1456 : &sg_class_member->kobj, "generic");
1457 2 : if (error)
1458 1 : printk(KERN_ERR "sg_add: unable to make symlink "
1459 : "'generic' back to sg%d\n", sdp->index);
1460 : } else
1461 1 : printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1462 :
1463 7 : sdev_printk(KERN_NOTICE, scsidp,
1464 : "Attached scsi generic sg%d type %d\n", sdp->index,
1465 : scsidp->type);
1466 :
1467 1 : dev_set_drvdata(cl_dev, sdp);
1468 :
1469 1 : return 0;
1470 2 :
1471 : cdev_add_err:
1472 2 : write_lock_irqsave(&sg_index_lock, iflags);
1473 4 : idr_remove(&sg_index_idr, sdp->index);
1474 2 : write_unlock_irqrestore(&sg_index_lock, iflags);
1475 2 : kfree(sdp);
1476 :
1477 2 : out:
1478 4 : put_disk(disk);
1479 8 : if (cdev)
1480 8 : cdev_del(cdev);
1481 5 : return error;
1482 : }
1483 :
1484 : static void sg_device_destroy(struct kref *kref)
1485 : {
1486 0 : struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1487 0 : unsigned long flags;
1488 0 :
1489 : /* CAUTION! Note that the device can still be found via idr_find()
1490 : * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1491 : * any other cleanup.
1492 : */
1493 :
1494 0 : write_lock_irqsave(&sg_index_lock, flags);
1495 0 : idr_remove(&sg_index_idr, sdp->index);
1496 0 : write_unlock_irqrestore(&sg_index_lock, flags);
1497 :
1498 : SCSI_LOG_TIMEOUT(3,
1499 : printk("sg_device_destroy: %s\n",
1500 : sdp->disk->disk_name));
1501 :
1502 0 : put_disk(sdp->disk);
1503 0 : kfree(sdp);
1504 0 : }
1505 :
1506 : static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1507 : {
1508 4 : struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1509 4 : Sg_device *sdp = dev_get_drvdata(cl_dev);
1510 1 : unsigned long iflags;
1511 1 : Sg_fd *sfp;
1512 1 :
1513 6 : if (!sdp || sdp->detached)
1514 2 : return;
1515 1 :
1516 : SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1517 :
1518 : /* Need a write lock to set sdp->detached. */
1519 1 : write_lock_irqsave(&sg_index_lock, iflags);
1520 1 : sdp->detached = 1;
1521 8 : list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1522 2 : wake_up_interruptible(&sfp->read_wait);
1523 3 : kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1524 : }
1525 1 : write_unlock_irqrestore(&sg_index_lock, iflags);
1526 :
1527 1 : sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1528 1 : device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1529 2 : cdev_del(sdp->cdev);
1530 1 : sdp->cdev = NULL;
1531 :
1532 2 : sg_put_dev(sdp);
1533 1 : }
1534 :
1535 : module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1536 : module_param_named(def_reserved_size, def_reserved_size, int,
1537 : S_IRUGO | S_IWUSR);
1538 : module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1539 :
1540 : MODULE_AUTHOR("Douglas Gilbert");
1541 : MODULE_DESCRIPTION("SCSI generic (sg) driver");
1542 : MODULE_LICENSE("GPL");
1543 : MODULE_VERSION(SG_VERSION_STR);
1544 : MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1545 :
1546 : MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1547 : "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1548 : MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1549 : MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1550 :
1551 : static int __init
1552 : init_sg(void)
1553 : {
1554 1 : int rc;
1555 1 :
1556 3 : if (scatter_elem_sz < PAGE_SIZE) {
1557 2 : scatter_elem_sz = PAGE_SIZE;
1558 2 : scatter_elem_sz_prev = scatter_elem_sz;
1559 : }
1560 2 : if (def_reserved_size >= 0)
1561 1 : sg_big_buff = def_reserved_size;
1562 : else
1563 1 : def_reserved_size = sg_big_buff;
1564 :
1565 1 : rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1566 : SG_MAX_DEVS, "sg");
1567 2 : if (rc)
1568 1 : return rc;
1569 2 : sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1570 4 : if ( IS_ERR(sg_sysfs_class) ) {
1571 3 : rc = PTR_ERR(sg_sysfs_class);
1572 1 : goto err_out;
1573 : }
1574 1 : sg_sysfs_valid = 1;
1575 2 : rc = scsi_register_interface(&sg_interface);
1576 2 : if (0 == rc) {
1577 : #ifdef CONFIG_SCSI_PROC_FS
1578 3 : sg_proc_init();
1579 : #endif /* CONFIG_SCSI_PROC_FS */
1580 1 : return 0;
1581 : }
1582 1 : class_destroy(sg_sysfs_class);
1583 : err_out:
1584 3 : unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1585 2 : return rc;
1586 : }
1587 :
1588 : static void __exit
1589 : exit_sg(void)
1590 : {
1591 : #ifdef CONFIG_SCSI_PROC_FS
1592 6 : sg_proc_cleanup();
1593 : #endif /* CONFIG_SCSI_PROC_FS */
1594 4 : scsi_unregister_interface(&sg_interface);
1595 2 : class_destroy(sg_sysfs_class);
1596 2 : sg_sysfs_valid = 0;
1597 2 : unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1598 : SG_MAX_DEVS);
1599 2 : idr_destroy(&sg_index_idr);
1600 2 : }
1601 :
1602 : static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1603 : {
1604 7 : int res;
1605 7 : struct request *rq;
1606 14 : Sg_fd *sfp = srp->parentfp;
1607 14 : sg_io_hdr_t *hp = &srp->header;
1608 21 : int dxfer_len = (int) hp->dxfer_len;
1609 14 : int dxfer_dir = hp->dxfer_direction;
1610 21 : unsigned int iov_count = hp->iovec_count;
1611 14 : Sg_scatter_hold *req_schp = &srp->data;
1612 14 : Sg_scatter_hold *rsv_schp = &sfp->reserve;
1613 14 : struct request_queue *q = sfp->parentdp->device->request_queue;
1614 7 : struct rq_map_data *md, map_data;
1615 14 : int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1616 7 :
1617 7 : SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1618 7 : dxfer_len));
1619 7 :
1620 14 : rq = blk_get_request(q, rw, GFP_ATOMIC);
1621 21 : if (!rq)
1622 14 : return -ENOMEM;
1623 7 :
1624 28 : memcpy(rq->cmd, cmd, hp->cmd_len);
1625 7 :
1626 14 : rq->cmd_len = hp->cmd_len;
1627 7 : rq->cmd_type = REQ_TYPE_BLOCK_PC;
1628 :
1629 7 : srp->rq = rq;
1630 7 : rq->end_io_data = srp;
1631 7 : rq->sense = srp->sense_b;
1632 7 : rq->retries = SG_DEFAULT_RETRIES;
1633 :
1634 28 : if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1635 7 : return 0;
1636 :
1637 112 : if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1638 : dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1639 : !sfp->parentdp->device->host->unchecked_isa_dma &&
1640 : blk_rq_aligned(q, hp->dxferp, dxfer_len))
1641 7 : md = NULL;
1642 : else
1643 14 : md = &map_data;
1644 :
1645 28 : if (md) {
1646 56 : if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1647 14 : sg_link_reserve(sfp, srp, dxfer_len);
1648 : else {
1649 35 : res = sg_build_indirect(req_schp, sfp, dxfer_len);
1650 14 : if (res)
1651 7 : return res;
1652 : }
1653 :
1654 14 : md->pages = req_schp->pages;
1655 14 : md->page_order = req_schp->page_order;
1656 28 : md->nr_entries = req_schp->k_use_sg;
1657 14 : md->offset = 0;
1658 28 : md->null_mapped = hp->dxferp ? 0 : 1;
1659 28 : if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1660 14 : md->from_user = 1;
1661 : else
1662 14 : md->from_user = 0;
1663 : }
1664 :
1665 56 : if (iov_count) {
1666 28 : int len, size = sizeof(struct sg_iovec) * iov_count;
1667 : struct iovec *iov;
1668 :
1669 63 : iov = kmalloc(size, GFP_ATOMIC);
1670 14 : if (!iov)
1671 7 : return -ENOMEM;
1672 :
1673 42 : if (copy_from_user(iov, hp->dxferp, size)) {
1674 7 : kfree(iov);
1675 7 : return -EFAULT;
1676 : }
1677 :
1678 21 : len = iov_length(iov, iov_count);
1679 14 : if (hp->dxfer_len < len) {
1680 21 : iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1681 14 : len = hp->dxfer_len;
1682 : }
1683 :
1684 7 : res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1685 : iov_count,
1686 : len, GFP_ATOMIC);
1687 7 : kfree(iov);
1688 : } else
1689 56 : res = blk_rq_map_user(q, rq, md, hp->dxferp,
1690 : hp->dxfer_len, GFP_ATOMIC);
1691 :
1692 70 : if (!res) {
1693 35 : srp->bio = rq->bio;
1694 :
1695 70 : if (!md) {
1696 35 : req_schp->dio_in_use = 1;
1697 35 : hp->info |= SG_INFO_DIRECT_IO;
1698 : }
1699 : }
1700 35 : return res;
1701 : }
1702 :
1703 : static int sg_finish_rem_req(Sg_request * srp)
1704 : {
1705 72 : int ret = 0;
1706 36 :
1707 72 : Sg_fd *sfp = srp->parentfp;
1708 36 : Sg_scatter_hold *req_schp = &srp->data;
1709 :
1710 : SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1711 108 : if (srp->rq) {
1712 108 : if (srp->bio)
1713 36 : ret = blk_rq_unmap_user(srp->bio);
1714 :
1715 36 : blk_put_request(srp->rq);
1716 : }
1717 :
1718 108 : if (srp->res_used)
1719 72 : sg_unlink_reserve(sfp, srp);
1720 : else
1721 108 : sg_remove_scat(req_schp);
1722 :
1723 216 : sg_remove_request(sfp, srp);
1724 :
1725 36 : return ret;
1726 : }
1727 :
1728 : static int
1729 : sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1730 : {
1731 22 : int sg_bufflen = tablesize * sizeof(struct page *);
1732 22 : gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1733 11 :
1734 33 : schp->pages = kzalloc(sg_bufflen, gfp_flags);
1735 33 : if (!schp->pages)
1736 11 : return -ENOMEM;
1737 11 : schp->sglist_len = sg_bufflen;
1738 11 : return tablesize; /* number of scat_gath elements allocated */
1739 : }
1740 :
1741 : static int
1742 : sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1743 : {
1744 22 : int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1745 22 : int sg_tablesize = sfp->parentdp->sg_tablesize;
1746 22 : int blk_size = buff_size, order;
1747 22 : gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1748 11 :
1749 33 : if (blk_size < 0)
1750 22 : return -EFAULT;
1751 33 : if (0 == blk_size)
1752 22 : ++blk_size; /* don't know why */
1753 11 : /* round request up to next highest SG_SECTOR_SZ byte boundary */
1754 22 : blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1755 11 : SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1756 11 : buff_size, blk_size));
1757 11 :
1758 : /* N.B. ret_sz carried into this block ... */
1759 22 : mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1760 22 : if (mx_sc_elems < 0)
1761 11 : return mx_sc_elems; /* most likely -ENOMEM */
1762 :
1763 11 : num = scatter_elem_sz;
1764 44 : if (unlikely(num != scatter_elem_sz_prev)) {
1765 22 : if (num < PAGE_SIZE) {
1766 11 : scatter_elem_sz = PAGE_SIZE;
1767 11 : scatter_elem_sz_prev = PAGE_SIZE;
1768 : } else
1769 11 : scatter_elem_sz_prev = num;
1770 : }
1771 :
1772 33 : if (sfp->low_dma)
1773 11 : gfp_mask |= GFP_DMA;
1774 :
1775 66 : if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1776 22 : gfp_mask |= __GFP_ZERO;
1777 :
1778 22 : order = get_order(num);
1779 : retry:
1780 22 : ret_sz = 1 << (PAGE_SHIFT + order);
1781 :
1782 77 : for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1783 55 : k++, rem_sz -= ret_sz) {
1784 33 :
1785 66 : num = (rem_sz > scatter_elem_sz_prev) ?
1786 : scatter_elem_sz_prev : rem_sz;
1787 :
1788 22 : schp->pages[k] = alloc_pages(gfp_mask, order);
1789 22 : if (!schp->pages[k])
1790 11 : goto out;
1791 :
1792 22 : if (num == scatter_elem_sz_prev) {
1793 44 : if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1794 11 : scatter_elem_sz = ret_sz;
1795 11 : scatter_elem_sz_prev = ret_sz;
1796 : }
1797 : }
1798 :
1799 : SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1800 : "ret_sz=%d\n", k, num, ret_sz));
1801 : } /* end of for loop */
1802 :
1803 11 : schp->page_order = order;
1804 11 : schp->k_use_sg = k;
1805 : SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1806 : "rem_sz=%d\n", k, rem_sz));
1807 :
1808 11 : schp->bufflen = blk_size;
1809 22 : if (rem_sz > 0) /* must have failed */
1810 11 : return -ENOMEM;
1811 11 : return 0;
1812 11 : out:
1813 55 : for (i = 0; i < k; i++)
1814 22 : __free_pages(schp->pages[i], order);
1815 22 :
1816 33 : if (--order >= 0)
1817 11 : goto retry;
1818 :
1819 11 : return -ENOMEM;
1820 : }
1821 :
1822 : static void
1823 : sg_remove_scat(Sg_scatter_hold * schp)
1824 : {
1825 42 : SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1826 210 : if (schp->pages && schp->sglist_len > 0) {
1827 126 : if (!schp->dio_in_use) {
1828 : int k;
1829 :
1830 336 : for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1831 42 : SCSI_LOG_TIMEOUT(5, printk(
1832 84 : "sg_remove_scat: k=%d, pg=0x%p\n",
1833 : k, schp->pages[k]));
1834 84 : __free_pages(schp->pages[k], schp->page_order);
1835 : }
1836 :
1837 84 : kfree(schp->pages);
1838 : }
1839 : }
1840 84 : memset(schp, 0, sizeof (*schp));
1841 84 : }
1842 :
1843 : static int
1844 : sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1845 : {
1846 2 : Sg_scatter_hold *schp = &srp->data;
1847 1 : int k, num;
1848 1 :
1849 1 : SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1850 1 : num_read_xfer));
1851 5 : if ((!outp) || (num_read_xfer <= 0))
1852 2 : return 0;
1853 :
1854 1 : num = 1 << (PAGE_SHIFT + schp->page_order);
1855 8 : for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1856 4 : if (num > num_read_xfer) {
1857 7 : if (__copy_to_user(outp, page_address(schp->pages[k]),
1858 : num_read_xfer))
1859 1 : return -EFAULT;
1860 1 : break;
1861 1 : } else {
1862 6 : if (__copy_to_user(outp, page_address(schp->pages[k]),
1863 : num))
1864 1 : return -EFAULT;
1865 1 : num_read_xfer -= num;
1866 2 : if (num_read_xfer <= 0)
1867 1 : break;
1868 1 : outp += num;
1869 : }
1870 : }
1871 :
1872 3 : return 0;
1873 : }
1874 :
1875 : static void
1876 : sg_build_reserve(Sg_fd * sfp, int req_size)
1877 : {
1878 8 : Sg_scatter_hold *schp = &sfp->reserve;
1879 8 :
1880 : SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1881 : do {
1882 8 : if (req_size < PAGE_SIZE)
1883 4 : req_size = PAGE_SIZE;
1884 28 : if (0 == sg_build_indirect(schp, sfp, req_size))
1885 4 : return;
1886 : else
1887 12 : sg_remove_scat(schp);
1888 4 : req_size >>= 1; /* divide by 2 */
1889 8 : } while (req_size > (PAGE_SIZE / 2));
1890 : }
1891 4 :
1892 : static void
1893 : sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1894 : {
1895 14 : Sg_scatter_hold *req_schp = &srp->data;
1896 18 : Sg_scatter_hold *rsv_schp = &sfp->reserve;
1897 7 : int k, num, rem;
1898 7 :
1899 14 : srp->res_used = 1;
1900 : SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1901 7 : rem = size;
1902 :
1903 7 : num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1904 42 : for (k = 0; k < rsv_schp->k_use_sg; k++) {
1905 28 : if (rem <= num) {
1906 14 : req_schp->k_use_sg = k + 1;
1907 7 : req_schp->sglist_len = rsv_schp->sglist_len;
1908 7 : req_schp->pages = rsv_schp->pages;
1909 :
1910 14 : req_schp->bufflen = size;
1911 7 : req_schp->page_order = rsv_schp->page_order;
1912 7 : break;
1913 : } else
1914 7 : rem -= num;
1915 : }
1916 :
1917 : if (k >= rsv_schp->k_use_sg)
1918 : SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1919 7 : }
1920 :
1921 : static void
1922 : sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1923 : {
1924 72 : Sg_scatter_hold *req_schp = &srp->data;
1925 :
1926 : SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1927 : (int) req_schp->k_use_sg));
1928 36 : req_schp->k_use_sg = 0;
1929 36 : req_schp->bufflen = 0;
1930 36 : req_schp->pages = NULL;
1931 36 : req_schp->page_order = 0;
1932 36 : req_schp->sglist_len = 0;
1933 36 : sfp->save_scat_len = 0;
1934 36 : srp->res_used = 0;
1935 36 : }
1936 :
1937 : static Sg_request *
1938 : sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1939 : {
1940 4 : Sg_request *resp;
1941 4 : unsigned long iflags;
1942 :
1943 4 : write_lock_irqsave(&sfp->rq_list_lock, iflags);
1944 20 : for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1945 8 : /* look for requests that are ready + not SG_IO owned */
1946 44 : if ((1 == resp->done) && (!resp->sg_io_owned) &&
1947 : ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1948 4 : resp->done = 2; /* guard against other readers */
1949 4 : break;
1950 4 : }
1951 : }
1952 4 : write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1953 4 : return resp;
1954 : }
1955 :
1956 : /* always adds to end of list */
1957 : static Sg_request *
1958 : sg_add_request(Sg_fd * sfp)
1959 : {
1960 3 : int k;
1961 3 : unsigned long iflags;
1962 3 : Sg_request *resp;
1963 6 : Sg_request *rp = sfp->req_arr;
1964 :
1965 3 : write_lock_irqsave(&sfp->rq_list_lock, iflags);
1966 3 : resp = sfp->headrp;
1967 6 : if (!resp) {
1968 3 : memset(rp, 0, sizeof (Sg_request));
1969 3 : rp->parentfp = sfp;
1970 3 : resp = rp;
1971 3 : sfp->headrp = resp;
1972 : } else {
1973 9 : if (0 == sfp->cmd_q)
1974 3 : resp = NULL; /* command queuing disallowed */
1975 : else {
1976 18 : for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
1977 15 : if (!rp->parentfp)
1978 6 : break;
1979 : }
1980 6 : if (k < SG_MAX_QUEUE) {
1981 3 : memset(rp, 0, sizeof (Sg_request));
1982 6 : rp->parentfp = sfp;
1983 12 : while (resp->nextrp)
1984 6 : resp = resp->nextrp;
1985 9 : resp->nextrp = rp;
1986 3 : resp = rp;
1987 : } else
1988 3 : resp = NULL;
1989 : }
1990 : }
1991 18 : if (resp) {
1992 9 : resp->nextrp = NULL;
1993 9 : resp->header.duration = jiffies_to_msecs(jiffies);
1994 : }
1995 9 : write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1996 9 : return resp;
1997 : }
1998 :
1999 : /* Return of 1 for found; 0 for not found */
2000 : static int
2001 : sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2002 : {
2003 94 : Sg_request *prev_rp;
2004 94 : Sg_request *rp;
2005 94 : unsigned long iflags;
2006 188 : int res = 0;
2007 :
2008 658 : if ((!sfp) || (!srp) || (!sfp->headrp))
2009 94 : return res;
2010 94 : write_lock_irqsave(&sfp->rq_list_lock, iflags);
2011 94 : prev_rp = sfp->headrp;
2012 188 : if (srp == prev_rp) {
2013 94 : sfp->headrp = prev_rp->nextrp;
2014 94 : prev_rp->parentfp = NULL;
2015 94 : res = 1;
2016 : } else {
2017 376 : while ((rp = prev_rp->nextrp)) {
2018 282 : if (srp == rp) {
2019 188 : prev_rp->nextrp = rp->nextrp;
2020 94 : rp->parentfp = NULL;
2021 94 : res = 1;
2022 94 : break;
2023 94 : }
2024 94 : prev_rp = rp;
2025 94 : }
2026 : }
2027 188 : write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2028 188 : return res;
2029 : }
2030 :
2031 : static Sg_fd *
2032 : sg_add_sfp(Sg_device * sdp, int dev)
2033 : {
2034 2 : Sg_fd *sfp;
2035 2 : unsigned long iflags;
2036 2 : int bufflen;
2037 2 :
2038 8 : sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2039 6 : if (!sfp)
2040 4 : return NULL;
2041 2 :
2042 4 : init_waitqueue_head(&sfp->read_wait);
2043 6 : rwlock_init(&sfp->rq_list_lock);
2044 :
2045 2 : kref_init(&sfp->f_ref);
2046 2 : sfp->timeout = SG_DEFAULT_TIMEOUT;
2047 2 : sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2048 2 : sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2049 4 : sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2050 : sdp->device->host->unchecked_isa_dma : 1;
2051 2 : sfp->cmd_q = SG_DEF_COMMAND_Q;
2052 2 : sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2053 2 : sfp->parentdp = sdp;
2054 2 : write_lock_irqsave(&sg_index_lock, iflags);
2055 4 : list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2056 2 : write_unlock_irqrestore(&sg_index_lock, iflags);
2057 : SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2058 8 : if (unlikely(sg_big_buff != def_reserved_size))
2059 2 : sg_big_buff = def_reserved_size;
2060 :
2061 20 : bufflen = min_t(int, sg_big_buff,
2062 : queue_max_sectors(sdp->device->request_queue) * 512);
2063 6 : sg_build_reserve(sfp, bufflen);
2064 : SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2065 : sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2066 :
2067 2 : kref_get(&sdp->d_ref);
2068 4 : __module_get(THIS_MODULE);
2069 2 : return sfp;
2070 : }
2071 :
2072 : static void sg_remove_sfp_usercontext(struct work_struct *work)
2073 : {
2074 0 : struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2075 0 : struct sg_device *sdp = sfp->parentdp;
2076 0 :
2077 : /* Cleanup any responses which were never read(). */
2078 0 : while (sfp->headrp)
2079 0 : sg_finish_rem_req(sfp->headrp);
2080 0 :
2081 0 : if (sfp->reserve.bufflen > 0) {
2082 : SCSI_LOG_TIMEOUT(6,
2083 : printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2084 : (int) sfp->reserve.bufflen,
2085 : (int) sfp->reserve.k_use_sg));
2086 0 : sg_remove_scat(&sfp->reserve);
2087 : }
2088 :
2089 : SCSI_LOG_TIMEOUT(6,
2090 : printk("sg_remove_sfp: %s, sfp=0x%p\n",
2091 : sdp->disk->disk_name,
2092 : sfp));
2093 0 : kfree(sfp);
2094 :
2095 0 : scsi_device_put(sdp->device);
2096 0 : sg_put_dev(sdp);
2097 0 : module_put(THIS_MODULE);
2098 0 : }
2099 :
2100 : static void sg_remove_sfp(struct kref *kref)
2101 : {
2102 0 : struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2103 0 : struct sg_device *sdp = sfp->parentdp;
2104 0 : unsigned long iflags;
2105 0 :
2106 0 : write_lock_irqsave(&sg_index_lock, iflags);
2107 0 : list_del(&sfp->sfd_siblings);
2108 0 : write_unlock_irqrestore(&sg_index_lock, iflags);
2109 0 : wake_up_interruptible(&sdp->o_excl_wait);
2110 :
2111 0 : INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2112 0 : schedule_work(&sfp->ew.work);
2113 0 : }
2114 :
2115 : static int
2116 : sg_res_in_use(Sg_fd * sfp)
2117 : {
2118 18 : const Sg_request *srp;
2119 18 : unsigned long iflags;
2120 :
2121 18 : read_lock_irqsave(&sfp->rq_list_lock, iflags);
2122 126 : for (srp = sfp->headrp; srp; srp = srp->nextrp)
2123 90 : if (srp->res_used)
2124 36 : break;
2125 18 : read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2126 18 : return srp ? 1 : 0;
2127 : }
2128 18 :
2129 : #ifdef CONFIG_SCSI_PROC_FS
2130 : static int
2131 : sg_idr_max_id(int id, void *p, void *data)
2132 : {
2133 0 : int *k = data;
2134 :
2135 0 : if (*k < id)
2136 0 : *k = id;
2137 :
2138 0 : return 0;
2139 : }
2140 :
2141 : static int
2142 : sg_last_dev(void)
2143 : {
2144 36 : int k = -1;
2145 18 : unsigned long iflags;
2146 :
2147 18 : read_lock_irqsave(&sg_index_lock, iflags);
2148 18 : idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2149 18 : read_unlock_irqrestore(&sg_index_lock, iflags);
2150 18 : return k + 1; /* origin 1 */
2151 : }
2152 : #endif
2153 :
2154 : /* must be called with sg_index_lock held */
2155 : static Sg_device *sg_lookup_dev(int dev)
2156 : {
2157 30 : return idr_find(&sg_index_idr, dev);
2158 : }
2159 :
2160 : static Sg_device *sg_get_dev(int dev)
2161 : {
2162 1 : struct sg_device *sdp;
2163 1 : unsigned long flags;
2164 1 :
2165 2 : read_lock_irqsave(&sg_index_lock, flags);
2166 4 : sdp = sg_lookup_dev(dev);
2167 2 : if (!sdp)
2168 3 : sdp = ERR_PTR(-ENXIO);
2169 3 : else if (sdp->detached) {
2170 : /* If sdp->detached, then the refcount may already be 0, in
2171 : * which case it would be a bug to do kref_get().
2172 : */
2173 3 : sdp = ERR_PTR(-ENODEV);
2174 : } else
2175 1 : kref_get(&sdp->d_ref);
2176 3 : read_unlock_irqrestore(&sg_index_lock, flags);
2177 :
2178 3 : return sdp;
2179 : }
2180 :
2181 : static void sg_put_dev(struct sg_device *sdp)
2182 : {
2183 9 : kref_put(&sdp->d_ref, sg_device_destroy);
2184 9 : }
2185 :
2186 : #ifdef CONFIG_SCSI_PROC_FS
2187 :
2188 1 : static struct proc_dir_entry *sg_proc_sgp = NULL;
2189 :
2190 1 : static char sg_proc_sg_dirname[] = "scsi/sg";
2191 :
2192 : static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2193 :
2194 : static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2195 : static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2196 : size_t count, loff_t *off);
2197 1 : static const struct file_operations adio_fops = {
2198 : .owner = THIS_MODULE,
2199 : .open = sg_proc_single_open_adio,
2200 : .read = seq_read,
2201 : .llseek = seq_lseek,
2202 : .write = sg_proc_write_adio,
2203 : .release = single_release,
2204 : };
2205 :
2206 : static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2207 : static ssize_t sg_proc_write_dressz(struct file *filp,
2208 : const char __user *buffer, size_t count, loff_t *off);
2209 1 : static const struct file_operations dressz_fops = {
2210 : .owner = THIS_MODULE,
2211 : .open = sg_proc_single_open_dressz,
2212 : .read = seq_read,
2213 : .llseek = seq_lseek,
2214 : .write = sg_proc_write_dressz,
2215 : .release = single_release,
2216 : };
2217 :
2218 : static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2219 : static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2220 1 : static const struct file_operations version_fops = {
2221 : .owner = THIS_MODULE,
2222 : .open = sg_proc_single_open_version,
2223 : .read = seq_read,
2224 : .llseek = seq_lseek,
2225 : .release = single_release,
2226 : };
2227 :
2228 : static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2229 : static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2230 1 : static const struct file_operations devhdr_fops = {
2231 : .owner = THIS_MODULE,
2232 : .open = sg_proc_single_open_devhdr,
2233 : .read = seq_read,
2234 : .llseek = seq_lseek,
2235 : .release = single_release,
2236 : };
2237 :
2238 : static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2239 : static int sg_proc_open_dev(struct inode *inode, struct file *file);
2240 : static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2241 : static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2242 : static void dev_seq_stop(struct seq_file *s, void *v);
2243 1 : static const struct file_operations dev_fops = {
2244 : .owner = THIS_MODULE,
2245 : .open = sg_proc_open_dev,
2246 : .read = seq_read,
2247 : .llseek = seq_lseek,
2248 : .release = seq_release,
2249 : };
2250 1 : static const struct seq_operations dev_seq_ops = {
2251 : .start = dev_seq_start,
2252 : .next = dev_seq_next,
2253 : .stop = dev_seq_stop,
2254 : .show = sg_proc_seq_show_dev,
2255 : };
2256 :
2257 : static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2258 : static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2259 1 : static const struct file_operations devstrs_fops = {
2260 : .owner = THIS_MODULE,
2261 : .open = sg_proc_open_devstrs,
2262 : .read = seq_read,
2263 : .llseek = seq_lseek,
2264 : .release = seq_release,
2265 : };
2266 1 : static const struct seq_operations devstrs_seq_ops = {
2267 : .start = dev_seq_start,
2268 : .next = dev_seq_next,
2269 : .stop = dev_seq_stop,
2270 : .show = sg_proc_seq_show_devstrs,
2271 : };
2272 :
2273 : static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2274 : static int sg_proc_open_debug(struct inode *inode, struct file *file);
2275 1 : static const struct file_operations debug_fops = {
2276 : .owner = THIS_MODULE,
2277 : .open = sg_proc_open_debug,
2278 : .read = seq_read,
2279 : .llseek = seq_lseek,
2280 : .release = seq_release,
2281 : };
2282 1 : static const struct seq_operations debug_seq_ops = {
2283 : .start = dev_seq_start,
2284 : .next = dev_seq_next,
2285 : .stop = dev_seq_stop,
2286 : .show = sg_proc_seq_show_debug,
2287 1 : };
2288 :
2289 :
2290 : struct sg_proc_leaf {
2291 : const char * name;
2292 : const struct file_operations * fops;
2293 : };
2294 :
2295 1 : static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2296 : {"allow_dio", &adio_fops},
2297 : {"debug", &debug_fops},
2298 : {"def_reserved_size", &dressz_fops},
2299 : {"device_hdr", &devhdr_fops},
2300 : {"devices", &dev_fops},
2301 : {"device_strs", &devstrs_fops},
2302 : {"version", &version_fops}
2303 : };
2304 :
2305 : static int
2306 : sg_proc_init(void)
2307 : {
2308 1 : int k, mask;
2309 2 : int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2310 1 : struct sg_proc_leaf * leaf;
2311 1 :
2312 1 : sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2313 2 : if (!sg_proc_sgp)
2314 1 : return 1;
2315 5 : for (k = 0; k < num_leaves; ++k) {
2316 2 : leaf = &sg_proc_leaf_arr[k];
2317 9 : mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2318 2 : proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2319 : }
2320 1 : return 0;
2321 : }
2322 :
2323 : static void
2324 : sg_proc_cleanup(void)
2325 : {
2326 2 : int k;
2327 4 : int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2328 :
2329 4 : if (!sg_proc_sgp)
2330 2 : return;
2331 10 : for (k = 0; k < num_leaves; ++k)
2332 4 : remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2333 6 : remove_proc_entry(sg_proc_sg_dirname, NULL);
2334 2 : }
2335 :
2336 :
2337 : static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2338 : {
2339 6 : seq_printf(s, "%d\n", *((int *)s->private));
2340 3 : return 0;
2341 : }
2342 :
2343 : static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2344 : {
2345 3 : return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2346 : }
2347 :
2348 : static ssize_t
2349 : sg_proc_write_adio(struct file *filp, const char __user *buffer,
2350 : size_t count, loff_t *off)
2351 : {
2352 1 : int num;
2353 1 : char buff[11];
2354 1 :
2355 7 : if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2356 3 : return -EACCES;
2357 7 : num = (count < 10) ? count : 10;
2358 5 : if (copy_from_user(buff, buffer, num))
2359 1 : return -EFAULT;
2360 1 : buff[num] = '\0';
2361 2 : sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2362 1 : return count;
2363 : }
2364 :
2365 : static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2366 : {
2367 3 : return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2368 : }
2369 :
2370 : static ssize_t
2371 : sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2372 : size_t count, loff_t *off)
2373 : {
2374 1 : int num;
2375 2 : unsigned long k = ULONG_MAX;
2376 1 : char buff[11];
2377 1 :
2378 7 : if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2379 3 : return -EACCES;
2380 6 : num = (count < 10) ? count : 10;
2381 5 : if (copy_from_user(buff, buffer, num))
2382 1 : return -EFAULT;
2383 1 : buff[num] = '\0';
2384 1 : k = simple_strtoul(buff, NULL, 10);
2385 2 : if (k <= 1048576) { /* limit "big buff" to 1 MB */
2386 1 : sg_big_buff = k;
2387 1 : return count;
2388 : }
2389 1 : return -ERANGE;
2390 : }
2391 :
2392 : static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2393 : {
2394 3 : seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2395 : sg_version_date);
2396 3 : return 0;
2397 : }
2398 :
2399 : static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2400 : {
2401 3 : return single_open(file, sg_proc_seq_show_version, NULL);
2402 : }
2403 :
2404 : static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2405 : {
2406 3 : seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2407 : "online\n");
2408 3 : return 0;
2409 : }
2410 :
2411 : static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2412 : {
2413 3 : return single_open(file, sg_proc_seq_show_devhdr, NULL);
2414 : }
2415 1 :
2416 : struct sg_proc_deviter {
2417 : loff_t index;
2418 : size_t max;
2419 : };
2420 :
2421 : static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2422 : {
2423 72 : struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2424 18 :
2425 36 : s->private = it;
2426 36 : if (! it)
2427 18 : return NULL;
2428 :
2429 18 : it->index = *pos;
2430 54 : it->max = sg_last_dev();
2431 72 : if (it->index >= it->max)
2432 18 : return NULL;
2433 18 : return it;
2434 : }
2435 :
2436 : static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2437 : {
2438 54 : struct sg_proc_deviter * it = s->private;
2439 :
2440 36 : *pos = ++it->index;
2441 144 : return (it->index < it->max) ? it : NULL;
2442 : }
2443 :
2444 : static void dev_seq_stop(struct seq_file *s, void *v)
2445 : {
2446 36 : kfree(s->private);
2447 18 : }
2448 :
2449 : static int sg_proc_open_dev(struct inode *inode, struct file *file)
2450 : {
2451 4 : return seq_open(file, &dev_seq_ops);
2452 : }
2453 :
2454 : static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2455 : {
2456 6 : struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2457 3 : Sg_device *sdp;
2458 3 : struct scsi_device *scsidp;
2459 3 : unsigned long iflags;
2460 3 :
2461 6 : read_lock_irqsave(&sg_index_lock, iflags);
2462 21 : sdp = it ? sg_lookup_dev(it->index) : NULL;
2463 48 : if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2464 24 : seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2465 : scsidp->host->host_no, scsidp->channel,
2466 : scsidp->id, scsidp->lun, (int) scsidp->type,
2467 : 1,
2468 : (int) scsidp->queue_depth,
2469 : (int) scsidp->device_busy,
2470 : (int) scsi_device_online(scsidp));
2471 : else
2472 18 : seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2473 9 : read_unlock_irqrestore(&sg_index_lock, iflags);
2474 9 : return 0;
2475 : }
2476 :
2477 : static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2478 : {
2479 4 : return seq_open(file, &devstrs_seq_ops);
2480 : }
2481 :
2482 : static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2483 : {
2484 6 : struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2485 3 : Sg_device *sdp;
2486 3 : struct scsi_device *scsidp;
2487 3 : unsigned long iflags;
2488 3 :
2489 3 : read_lock_irqsave(&sg_index_lock, iflags);
2490 21 : sdp = it ? sg_lookup_dev(it->index) : NULL;
2491 48 : if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2492 6 : seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2493 : scsidp->vendor, scsidp->model, scsidp->rev);
2494 : else
2495 18 : seq_printf(s, "<no active device>\n");
2496 6 : read_unlock_irqrestore(&sg_index_lock, iflags);
2497 6 : return 0;
2498 : }
2499 :
2500 : /* must be called while holding sg_index_lock */
2501 : static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2502 : {
2503 3 : int k, m, new_interface, blen, usg;
2504 3 : Sg_request *srp;
2505 3 : Sg_fd *fp;
2506 3 : const sg_io_hdr_t *hp;
2507 3 : const char * cp;
2508 3 : unsigned int ms;
2509 3 :
2510 6 : k = 0;
2511 27 : list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2512 9 : k++;
2513 12 : read_lock(&fp->rq_list_lock); /* irqs already disabled */
2514 15 : seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2515 3 : "(res)sgat=%d low_dma=%d\n", k,
2516 3 : jiffies_to_msecs(fp->timeout),
2517 3 : fp->reserve.bufflen,
2518 3 : (int) fp->reserve.k_use_sg,
2519 : (int) fp->low_dma);
2520 15 : seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2521 : (int) fp->cmd_q, (int) fp->force_packid,
2522 : (int) fp->keep_orphan, (int) fp->closed);
2523 15 : for (m = 0, srp = fp->headrp;
2524 3 : srp != NULL;
2525 6 : ++m, srp = srp->nextrp) {
2526 6 : hp = &srp->header;
2527 9 : new_interface = (hp->interface_id == '\0') ? 0 : 1;
2528 9 : if (srp->res_used) {
2529 15 : if (new_interface &&
2530 : (SG_FLAG_MMAP_IO & hp->flags))
2531 3 : cp = " mmap>> ";
2532 : else
2533 3 : cp = " rb>> ";
2534 : } else {
2535 9 : if (SG_INFO_DIRECT_IO_MASK & hp->info)
2536 3 : cp = " dio>> ";
2537 : else
2538 3 : cp = " ";
2539 : }
2540 3 : seq_printf(s, cp);
2541 3 : blen = srp->data.bufflen;
2542 3 : usg = srp->data.k_use_sg;
2543 39 : seq_printf(s, srp->done ?
2544 : ((1 == srp->done) ? "rcv:" : "fin:")
2545 : : "act:");
2546 3 : seq_printf(s, " id=%d blen=%d",
2547 : srp->header.pack_id, blen);
2548 9 : if (srp->done)
2549 3 : seq_printf(s, " dur=%d", hp->duration);
2550 : else {
2551 3 : ms = jiffies_to_msecs(jiffies);
2552 42 : seq_printf(s, " t_o/elap=%d/%d",
2553 : (new_interface ? hp->timeout :
2554 : jiffies_to_msecs(fp->timeout)),
2555 : (ms > hp->duration ? ms - hp->duration : 0));
2556 : }
2557 3 : seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2558 : (int) srp->data.cmd_opcode);
2559 : }
2560 6 : if (0 == m)
2561 3 : seq_printf(s, " No requests active\n");
2562 6 : read_unlock(&fp->rq_list_lock);
2563 : }
2564 : }
2565 :
2566 : static int sg_proc_open_debug(struct inode *inode, struct file *file)
2567 : {
2568 4 : return seq_open(file, &debug_seq_ops);
2569 : }
2570 :
2571 : static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2572 : {
2573 6 : struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2574 3 : Sg_device *sdp;
2575 3 : unsigned long iflags;
2576 3 :
2577 15 : if (it && (0 == it->index)) {
2578 9 : seq_printf(s, "max_active_device=%d(origin 1)\n",
2579 : (int)it->max);
2580 3 : seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2581 : }
2582 :
2583 3 : read_lock_irqsave(&sg_index_lock, iflags);
2584 21 : sdp = it ? sg_lookup_dev(it->index) : NULL;
2585 30 : if (sdp && !list_empty(&sdp->sfds)) {
2586 3 : struct scsi_device *scsidp = sdp->device;
2587 :
2588 3 : seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2589 9 : if (sdp->detached)
2590 3 : seq_printf(s, "detached pending close ");
2591 : else
2592 : seq_printf
2593 6 : (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2594 : scsidp->host->host_no,
2595 : scsidp->channel, scsidp->id,
2596 : scsidp->lun,
2597 : scsidp->host->hostt->emulated);
2598 6 : seq_printf(s, " sg_tablesize=%d excl=%d\n",
2599 : sdp->sg_tablesize, sdp->exclude);
2600 6 : sg_proc_debug_helper(s, sdp);
2601 : }
2602 12 : read_unlock_irqrestore(&sg_index_lock, iflags);
2603 12 : return 0;
2604 : }
2605 :
2606 : #endif /* CONFIG_SCSI_PROC_FS */
2607 :
2608 : module_init(init_sg);
2609 : module_exit(exit_sg);
|