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