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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 - 2014 Douglas Gilbert | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2, or (at your option) | |
15 | * any later version. | |
16 | * | |
17 | */ | |
18 | ||
19 | static int sg_version_num = 30536; /* 2 digits for each component */ | |
20 | #define SG_VERSION_STR "3.5.36" | |
21 | ||
22 | /* | |
23 | * D. P. Gilbert (dgilbert@interlog.com), notes: | |
24 | * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First | |
25 | * the kernel/module needs to be built with CONFIG_SCSI_LOGGING | |
26 | * (otherwise the macros compile to empty statements). | |
27 | * | |
28 | */ | |
29 | #include <linux/module.h> | |
30 | ||
31 | #include <linux/fs.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/mtio.h> | |
38 | #include <linux/ioctl.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/fcntl.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/poll.h> | |
43 | #include <linux/moduleparam.h> | |
44 | #include <linux/cdev.h> | |
45 | #include <linux/idr.h> | |
46 | #include <linux/seq_file.h> | |
47 | #include <linux/blkdev.h> | |
48 | #include <linux/delay.h> | |
49 | #include <linux/blktrace_api.h> | |
50 | #include <linux/mutex.h> | |
51 | #include <linux/atomic.h> | |
52 | #include <linux/ratelimit.h> | |
53 | #include <linux/uio.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 = "20140603"; | |
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 | /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type | |
77 | * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater | |
78 | * than 16 bytes are "variable length" whose length is a multiple of 4 | |
79 | */ | |
80 | #define SG_MAX_CDB_SIZE 252 | |
81 | ||
82 | #define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) | |
83 | ||
84 | int sg_big_buff = SG_DEF_RESERVED_SIZE; | |
85 | /* N.B. This variable is readable and writeable via | |
86 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer | |
87 | of this size (or less if there is not enough memory) will be reserved | |
88 | for use by this file descriptor. [Deprecated usage: this variable is also | |
89 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into | |
90 | the kernel (i.e. it is not a module).] */ | |
91 | static int def_reserved_size = -1; /* picks up init parameter */ | |
92 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; | |
93 | ||
94 | static int scatter_elem_sz = SG_SCATTER_SZ; | |
95 | static int scatter_elem_sz_prev = SG_SCATTER_SZ; | |
96 | ||
97 | #define SG_SECTOR_SZ 512 | |
98 | ||
99 | static int sg_add_device(struct device *, struct class_interface *); | |
100 | static void sg_remove_device(struct device *, struct class_interface *); | |
101 | ||
102 | static DEFINE_IDR(sg_index_idr); | |
103 | static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock | |
104 | file descriptor list for device */ | |
105 | ||
106 | static struct class_interface sg_interface = { | |
107 | .add_dev = sg_add_device, | |
108 | .remove_dev = sg_remove_device, | |
109 | }; | |
110 | ||
111 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
112 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
113 | unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ | |
114 | unsigned bufflen; /* Size of (aggregate) data buffer */ | |
115 | struct page **pages; | |
116 | int page_order; | |
117 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ | |
118 | unsigned char cmd_opcode; /* first byte of command */ | |
119 | } Sg_scatter_hold; | |
120 | ||
121 | struct sg_device; /* forward declarations */ | |
122 | struct sg_fd; | |
123 | ||
124 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
125 | struct sg_request *nextrp; /* NULL -> tail request (slist) */ | |
126 | struct sg_fd *parentfp; /* NULL -> not in use */ | |
127 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
128 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
129 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; | |
130 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ | |
131 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
132 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
133 | /* done protected by rq_list_lock */ | |
134 | char done; /* 0->before bh, 1->before read, 2->read */ | |
135 | struct request *rq; | |
136 | struct bio *bio; | |
137 | struct execute_work ew; | |
138 | } Sg_request; | |
139 | ||
140 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
141 | struct list_head sfd_siblings; /* protected by device's sfd_lock */ | |
142 | struct sg_device *parentdp; /* owning device */ | |
143 | wait_queue_head_t read_wait; /* queue read until command done */ | |
144 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
145 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ | |
146 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
147 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
148 | unsigned save_scat_len; /* original length of trunc. scat. element */ | |
149 | Sg_request *headrp; /* head of request slist, NULL->empty */ | |
150 | struct fasync_struct *async_qp; /* used by asynchronous notification */ | |
151 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
152 | char low_dma; /* as in parent but possibly overridden to 1 */ | |
153 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ | |
154 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ | |
155 | unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ | |
156 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ | |
157 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
158 | struct kref f_ref; | |
159 | struct execute_work ew; | |
160 | } Sg_fd; | |
161 | ||
162 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
163 | struct scsi_device *device; | |
164 | wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ | |
165 | struct mutex open_rel_lock; /* held when in open() or release() */ | |
166 | int sg_tablesize; /* adapter's max scatter-gather table size */ | |
167 | u32 index; /* device index number */ | |
168 | struct list_head sfds; | |
169 | rwlock_t sfd_lock; /* protect access to sfd list */ | |
170 | atomic_t detaching; /* 0->device usable, 1->device detaching */ | |
171 | bool exclude; /* 1->open(O_EXCL) succeeded and is active */ | |
172 | int open_cnt; /* count of opens (perhaps < num(sfds) ) */ | |
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 | } 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_fd * sfp, 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); | |
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_device_destroy(struct kref *kref); | |
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 | #define sg_printk(prefix, sdp, fmt, a...) \ | |
211 | sdev_prefix_printk(prefix, (sdp)->device, \ | |
212 | (sdp)->disk->disk_name, fmt, ##a) | |
213 | ||
214 | static int sg_allow_access(struct file *filp, unsigned char *cmd) | |
215 | { | |
216 | struct sg_fd *sfp = filp->private_data; | |
217 | ||
218 | if (sfp->parentdp->device->type == TYPE_SCANNER) | |
219 | return 0; | |
220 | ||
221 | return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); | |
222 | } | |
223 | ||
224 | static int | |
225 | open_wait(Sg_device *sdp, int flags) | |
226 | { | |
227 | int retval = 0; | |
228 | ||
229 | if (flags & O_EXCL) { | |
230 | while (sdp->open_cnt > 0) { | |
231 | mutex_unlock(&sdp->open_rel_lock); | |
232 | retval = wait_event_interruptible(sdp->open_wait, | |
233 | (atomic_read(&sdp->detaching) || | |
234 | !sdp->open_cnt)); | |
235 | mutex_lock(&sdp->open_rel_lock); | |
236 | ||
237 | if (retval) /* -ERESTARTSYS */ | |
238 | return retval; | |
239 | if (atomic_read(&sdp->detaching)) | |
240 | return -ENODEV; | |
241 | } | |
242 | } else { | |
243 | while (sdp->exclude) { | |
244 | mutex_unlock(&sdp->open_rel_lock); | |
245 | retval = wait_event_interruptible(sdp->open_wait, | |
246 | (atomic_read(&sdp->detaching) || | |
247 | !sdp->exclude)); | |
248 | mutex_lock(&sdp->open_rel_lock); | |
249 | ||
250 | if (retval) /* -ERESTARTSYS */ | |
251 | return retval; | |
252 | if (atomic_read(&sdp->detaching)) | |
253 | return -ENODEV; | |
254 | } | |
255 | } | |
256 | ||
257 | return retval; | |
258 | } | |
259 | ||
260 | /* Returns 0 on success, else a negated errno value */ | |
261 | static int | |
262 | sg_open(struct inode *inode, struct file *filp) | |
263 | { | |
264 | int dev = iminor(inode); | |
265 | int flags = filp->f_flags; | |
266 | struct request_queue *q; | |
267 | Sg_device *sdp; | |
268 | Sg_fd *sfp; | |
269 | int retval; | |
270 | ||
271 | nonseekable_open(inode, filp); | |
272 | if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) | |
273 | return -EPERM; /* Can't lock it with read only access */ | |
274 | sdp = sg_get_dev(dev); | |
275 | if (IS_ERR(sdp)) | |
276 | return PTR_ERR(sdp); | |
277 | ||
278 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, | |
279 | "sg_open: flags=0x%x\n", flags)); | |
280 | ||
281 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ | |
282 | /* Prevent the device driver from vanishing while we sleep */ | |
283 | retval = scsi_device_get(sdp->device); | |
284 | if (retval) | |
285 | goto sg_put; | |
286 | ||
287 | retval = scsi_autopm_get_device(sdp->device); | |
288 | if (retval) | |
289 | goto sdp_put; | |
290 | ||
291 | /* scsi_block_when_processing_errors() may block so bypass | |
292 | * check if O_NONBLOCK. Permits SCSI commands to be issued | |
293 | * during error recovery. Tread carefully. */ | |
294 | if (!((flags & O_NONBLOCK) || | |
295 | scsi_block_when_processing_errors(sdp->device))) { | |
296 | retval = -ENXIO; | |
297 | /* we are in error recovery for this device */ | |
298 | goto error_out; | |
299 | } | |
300 | ||
301 | mutex_lock(&sdp->open_rel_lock); | |
302 | if (flags & O_NONBLOCK) { | |
303 | if (flags & O_EXCL) { | |
304 | if (sdp->open_cnt > 0) { | |
305 | retval = -EBUSY; | |
306 | goto error_mutex_locked; | |
307 | } | |
308 | } else { | |
309 | if (sdp->exclude) { | |
310 | retval = -EBUSY; | |
311 | goto error_mutex_locked; | |
312 | } | |
313 | } | |
314 | } else { | |
315 | retval = open_wait(sdp, flags); | |
316 | if (retval) /* -ERESTARTSYS or -ENODEV */ | |
317 | goto error_mutex_locked; | |
318 | } | |
319 | ||
320 | /* N.B. at this point we are holding the open_rel_lock */ | |
321 | if (flags & O_EXCL) | |
322 | sdp->exclude = true; | |
323 | ||
324 | if (sdp->open_cnt < 1) { /* no existing opens */ | |
325 | sdp->sgdebug = 0; | |
326 | q = sdp->device->request_queue; | |
327 | sdp->sg_tablesize = queue_max_segments(q); | |
328 | } | |
329 | sfp = sg_add_sfp(sdp); | |
330 | if (IS_ERR(sfp)) { | |
331 | retval = PTR_ERR(sfp); | |
332 | goto out_undo; | |
333 | } | |
334 | ||
335 | filp->private_data = sfp; | |
336 | sdp->open_cnt++; | |
337 | mutex_unlock(&sdp->open_rel_lock); | |
338 | ||
339 | retval = 0; | |
340 | sg_put: | |
341 | kref_put(&sdp->d_ref, sg_device_destroy); | |
342 | return retval; | |
343 | ||
344 | out_undo: | |
345 | if (flags & O_EXCL) { | |
346 | sdp->exclude = false; /* undo if error */ | |
347 | wake_up_interruptible(&sdp->open_wait); | |
348 | } | |
349 | error_mutex_locked: | |
350 | mutex_unlock(&sdp->open_rel_lock); | |
351 | error_out: | |
352 | scsi_autopm_put_device(sdp->device); | |
353 | sdp_put: | |
354 | scsi_device_put(sdp->device); | |
355 | goto sg_put; | |
356 | } | |
357 | ||
358 | /* Release resources associated with a successful sg_open() | |
359 | * Returns 0 on success, else a negated errno value */ | |
360 | static int | |
361 | sg_release(struct inode *inode, struct file *filp) | |
362 | { | |
363 | Sg_device *sdp; | |
364 | Sg_fd *sfp; | |
365 | ||
366 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
367 | return -ENXIO; | |
368 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n")); | |
369 | ||
370 | mutex_lock(&sdp->open_rel_lock); | |
371 | scsi_autopm_put_device(sdp->device); | |
372 | kref_put(&sfp->f_ref, sg_remove_sfp); | |
373 | sdp->open_cnt--; | |
374 | ||
375 | /* possibly many open()s waiting on exlude clearing, start many; | |
376 | * only open(O_EXCL)s wait on 0==open_cnt so only start one */ | |
377 | if (sdp->exclude) { | |
378 | sdp->exclude = false; | |
379 | wake_up_interruptible_all(&sdp->open_wait); | |
380 | } else if (0 == sdp->open_cnt) { | |
381 | wake_up_interruptible(&sdp->open_wait); | |
382 | } | |
383 | mutex_unlock(&sdp->open_rel_lock); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static ssize_t | |
388 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
389 | { | |
390 | Sg_device *sdp; | |
391 | Sg_fd *sfp; | |
392 | Sg_request *srp; | |
393 | int req_pack_id = -1; | |
394 | sg_io_hdr_t *hp; | |
395 | struct sg_header *old_hdr = NULL; | |
396 | int retval = 0; | |
397 | ||
398 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
399 | return -ENXIO; | |
400 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, | |
401 | "sg_read: count=%d\n", (int) count)); | |
402 | ||
403 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
404 | return -EFAULT; | |
405 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { | |
406 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
407 | if (!old_hdr) | |
408 | return -ENOMEM; | |
409 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { | |
410 | retval = -EFAULT; | |
411 | goto free_old_hdr; | |
412 | } | |
413 | if (old_hdr->reply_len < 0) { | |
414 | if (count >= SZ_SG_IO_HDR) { | |
415 | sg_io_hdr_t *new_hdr; | |
416 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); | |
417 | if (!new_hdr) { | |
418 | retval = -ENOMEM; | |
419 | goto free_old_hdr; | |
420 | } | |
421 | retval =__copy_from_user | |
422 | (new_hdr, buf, SZ_SG_IO_HDR); | |
423 | req_pack_id = new_hdr->pack_id; | |
424 | kfree(new_hdr); | |
425 | if (retval) { | |
426 | retval = -EFAULT; | |
427 | goto free_old_hdr; | |
428 | } | |
429 | } | |
430 | } else | |
431 | req_pack_id = old_hdr->pack_id; | |
432 | } | |
433 | srp = sg_get_rq_mark(sfp, req_pack_id); | |
434 | if (!srp) { /* now wait on packet to arrive */ | |
435 | if (atomic_read(&sdp->detaching)) { | |
436 | retval = -ENODEV; | |
437 | goto free_old_hdr; | |
438 | } | |
439 | if (filp->f_flags & O_NONBLOCK) { | |
440 | retval = -EAGAIN; | |
441 | goto free_old_hdr; | |
442 | } | |
443 | retval = wait_event_interruptible(sfp->read_wait, | |
444 | (atomic_read(&sdp->detaching) || | |
445 | (srp = sg_get_rq_mark(sfp, req_pack_id)))); | |
446 | if (atomic_read(&sdp->detaching)) { | |
447 | retval = -ENODEV; | |
448 | goto free_old_hdr; | |
449 | } | |
450 | if (retval) { | |
451 | /* -ERESTARTSYS as signal hit process */ | |
452 | goto free_old_hdr; | |
453 | } | |
454 | } | |
455 | if (srp->header.interface_id != '\0') { | |
456 | retval = sg_new_read(sfp, buf, count, srp); | |
457 | goto free_old_hdr; | |
458 | } | |
459 | ||
460 | hp = &srp->header; | |
461 | if (old_hdr == NULL) { | |
462 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
463 | if (! old_hdr) { | |
464 | retval = -ENOMEM; | |
465 | goto free_old_hdr; | |
466 | } | |
467 | } | |
468 | memset(old_hdr, 0, SZ_SG_HEADER); | |
469 | old_hdr->reply_len = (int) hp->timeout; | |
470 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
471 | old_hdr->pack_id = hp->pack_id; | |
472 | old_hdr->twelve_byte = | |
473 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; | |
474 | old_hdr->target_status = hp->masked_status; | |
475 | old_hdr->host_status = hp->host_status; | |
476 | old_hdr->driver_status = hp->driver_status; | |
477 | if ((CHECK_CONDITION & hp->masked_status) || | |
478 | (DRIVER_SENSE & hp->driver_status)) | |
479 | memcpy(old_hdr->sense_buffer, srp->sense_b, | |
480 | sizeof (old_hdr->sense_buffer)); | |
481 | switch (hp->host_status) { | |
482 | /* This setup of 'result' is for backward compatibility and is best | |
483 | ignored by the user who should use target, host + driver status */ | |
484 | case DID_OK: | |
485 | case DID_PASSTHROUGH: | |
486 | case DID_SOFT_ERROR: | |
487 | old_hdr->result = 0; | |
488 | break; | |
489 | case DID_NO_CONNECT: | |
490 | case DID_BUS_BUSY: | |
491 | case DID_TIME_OUT: | |
492 | old_hdr->result = EBUSY; | |
493 | break; | |
494 | case DID_BAD_TARGET: | |
495 | case DID_ABORT: | |
496 | case DID_PARITY: | |
497 | case DID_RESET: | |
498 | case DID_BAD_INTR: | |
499 | old_hdr->result = EIO; | |
500 | break; | |
501 | case DID_ERROR: | |
502 | old_hdr->result = (srp->sense_b[0] == 0 && | |
503 | hp->masked_status == GOOD) ? 0 : EIO; | |
504 | break; | |
505 | default: | |
506 | old_hdr->result = EIO; | |
507 | break; | |
508 | } | |
509 | ||
510 | /* Now copy the result back to the user buffer. */ | |
511 | if (count >= SZ_SG_HEADER) { | |
512 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { | |
513 | retval = -EFAULT; | |
514 | goto free_old_hdr; | |
515 | } | |
516 | buf += SZ_SG_HEADER; | |
517 | if (count > old_hdr->reply_len) | |
518 | count = old_hdr->reply_len; | |
519 | if (count > SZ_SG_HEADER) { | |
520 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { | |
521 | retval = -EFAULT; | |
522 | goto free_old_hdr; | |
523 | } | |
524 | } | |
525 | } else | |
526 | count = (old_hdr->result == 0) ? 0 : -EIO; | |
527 | sg_finish_rem_req(srp); | |
528 | retval = count; | |
529 | free_old_hdr: | |
530 | kfree(old_hdr); | |
531 | return retval; | |
532 | } | |
533 | ||
534 | static ssize_t | |
535 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
536 | { | |
537 | sg_io_hdr_t *hp = &srp->header; | |
538 | int err = 0, err2; | |
539 | int len; | |
540 | ||
541 | if (count < SZ_SG_IO_HDR) { | |
542 | err = -EINVAL; | |
543 | goto err_out; | |
544 | } | |
545 | hp->sb_len_wr = 0; | |
546 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
547 | if ((CHECK_CONDITION & hp->masked_status) || | |
548 | (DRIVER_SENSE & hp->driver_status)) { | |
549 | int sb_len = SCSI_SENSE_BUFFERSIZE; | |
550 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; | |
551 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
552 | len = (len > sb_len) ? sb_len : len; | |
553 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
554 | err = -EFAULT; | |
555 | goto err_out; | |
556 | } | |
557 | hp->sb_len_wr = len; | |
558 | } | |
559 | } | |
560 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
561 | hp->info |= SG_INFO_CHECK; | |
562 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { | |
563 | err = -EFAULT; | |
564 | goto err_out; | |
565 | } | |
566 | err_out: | |
567 | err2 = sg_finish_rem_req(srp); | |
568 | return err ? : err2 ? : count; | |
569 | } | |
570 | ||
571 | static ssize_t | |
572 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
573 | { | |
574 | int mxsize, cmd_size, k; | |
575 | int input_size, blocking; | |
576 | unsigned char opcode; | |
577 | Sg_device *sdp; | |
578 | Sg_fd *sfp; | |
579 | Sg_request *srp; | |
580 | struct sg_header old_hdr; | |
581 | sg_io_hdr_t *hp; | |
582 | unsigned char cmnd[SG_MAX_CDB_SIZE]; | |
583 | ||
584 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
585 | return -ENXIO; | |
586 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, | |
587 | "sg_write: count=%d\n", (int) count)); | |
588 | if (atomic_read(&sdp->detaching)) | |
589 | return -ENODEV; | |
590 | if (!((filp->f_flags & O_NONBLOCK) || | |
591 | scsi_block_when_processing_errors(sdp->device))) | |
592 | return -ENXIO; | |
593 | ||
594 | if (!access_ok(VERIFY_READ, buf, count)) | |
595 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
596 | if (count < SZ_SG_HEADER) | |
597 | return -EIO; | |
598 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) | |
599 | return -EFAULT; | |
600 | blocking = !(filp->f_flags & O_NONBLOCK); | |
601 | if (old_hdr.reply_len < 0) | |
602 | return sg_new_write(sfp, filp, buf, count, | |
603 | blocking, 0, 0, NULL); | |
604 | if (count < (SZ_SG_HEADER + 6)) | |
605 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
606 | ||
607 | if (!(srp = sg_add_request(sfp))) { | |
608 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp, | |
609 | "sg_write: queue full\n")); | |
610 | return -EDOM; | |
611 | } | |
612 | buf += SZ_SG_HEADER; | |
613 | __get_user(opcode, buf); | |
614 | if (sfp->next_cmd_len > 0) { | |
615 | cmd_size = sfp->next_cmd_len; | |
616 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
617 | } else { | |
618 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
619 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
620 | cmd_size = 12; | |
621 | } | |
622 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, | |
623 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); | |
624 | /* Determine buffer size. */ | |
625 | input_size = count - cmd_size; | |
626 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
627 | mxsize -= SZ_SG_HEADER; | |
628 | input_size -= SZ_SG_HEADER; | |
629 | if (input_size < 0) { | |
630 | sg_remove_request(sfp, srp); | |
631 | return -EIO; /* User did not pass enough bytes for this command. */ | |
632 | } | |
633 | hp = &srp->header; | |
634 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
635 | hp->cmd_len = (unsigned char) cmd_size; | |
636 | hp->iovec_count = 0; | |
637 | hp->mx_sb_len = 0; | |
638 | if (input_size > 0) | |
639 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
640 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
641 | else | |
642 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
643 | hp->dxfer_len = mxsize; | |
644 | if ((hp->dxfer_direction == SG_DXFER_TO_DEV) || | |
645 | (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)) | |
646 | hp->dxferp = (char __user *)buf + cmd_size; | |
647 | else | |
648 | hp->dxferp = NULL; | |
649 | hp->sbp = NULL; | |
650 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
651 | hp->flags = input_size; /* structure abuse ... */ | |
652 | hp->pack_id = old_hdr.pack_id; | |
653 | hp->usr_ptr = NULL; | |
654 | if (__copy_from_user(cmnd, buf, cmd_size)) | |
655 | return -EFAULT; | |
656 | /* | |
657 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
658 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
659 | * is a non-zero input_size, so emit a warning. | |
660 | */ | |
661 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { | |
662 | static char cmd[TASK_COMM_LEN]; | |
663 | if (strcmp(current->comm, cmd)) { | |
664 | printk_ratelimited(KERN_WARNING | |
665 | "sg_write: data in/out %d/%d bytes " | |
666 | "for SCSI command 0x%x-- guessing " | |
667 | "data in;\n program %s not setting " | |
668 | "count and/or reply_len properly\n", | |
669 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
670 | input_size, (unsigned int) cmnd[0], | |
671 | current->comm); | |
672 | strcpy(cmd, current->comm); | |
673 | } | |
674 | } | |
675 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); | |
676 | return (k < 0) ? k : count; | |
677 | } | |
678 | ||
679 | static ssize_t | |
680 | sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, | |
681 | size_t count, int blocking, int read_only, int sg_io_owned, | |
682 | Sg_request **o_srp) | |
683 | { | |
684 | int k; | |
685 | Sg_request *srp; | |
686 | sg_io_hdr_t *hp; | |
687 | unsigned char cmnd[SG_MAX_CDB_SIZE]; | |
688 | int timeout; | |
689 | unsigned long ul_timeout; | |
690 | ||
691 | if (count < SZ_SG_IO_HDR) | |
692 | return -EINVAL; | |
693 | if (!access_ok(VERIFY_READ, buf, count)) | |
694 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
695 | ||
696 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
697 | if (!(srp = sg_add_request(sfp))) { | |
698 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, | |
699 | "sg_new_write: queue full\n")); | |
700 | return -EDOM; | |
701 | } | |
702 | srp->sg_io_owned = sg_io_owned; | |
703 | hp = &srp->header; | |
704 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { | |
705 | sg_remove_request(sfp, srp); | |
706 | return -EFAULT; | |
707 | } | |
708 | if (hp->interface_id != 'S') { | |
709 | sg_remove_request(sfp, srp); | |
710 | return -ENOSYS; | |
711 | } | |
712 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
713 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
714 | sg_remove_request(sfp, srp); | |
715 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
716 | } | |
717 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
718 | sg_remove_request(sfp, srp); | |
719 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
720 | } | |
721 | if (sg_res_in_use(sfp)) { | |
722 | sg_remove_request(sfp, srp); | |
723 | return -EBUSY; /* reserve buffer already being used */ | |
724 | } | |
725 | } | |
726 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
727 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
728 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
729 | sg_remove_request(sfp, srp); | |
730 | return -EMSGSIZE; | |
731 | } | |
732 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { | |
733 | sg_remove_request(sfp, srp); | |
734 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
735 | } | |
736 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { | |
737 | sg_remove_request(sfp, srp); | |
738 | return -EFAULT; | |
739 | } | |
740 | if (read_only && sg_allow_access(file, cmnd)) { | |
741 | sg_remove_request(sfp, srp); | |
742 | return -EPERM; | |
743 | } | |
744 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
745 | if (k < 0) | |
746 | return k; | |
747 | if (o_srp) | |
748 | *o_srp = srp; | |
749 | return count; | |
750 | } | |
751 | ||
752 | static int | |
753 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
754 | unsigned char *cmnd, int timeout, int blocking) | |
755 | { | |
756 | int k, at_head; | |
757 | Sg_device *sdp = sfp->parentdp; | |
758 | sg_io_hdr_t *hp = &srp->header; | |
759 | ||
760 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
761 | hp->status = 0; | |
762 | hp->masked_status = 0; | |
763 | hp->msg_status = 0; | |
764 | hp->info = 0; | |
765 | hp->host_status = 0; | |
766 | hp->driver_status = 0; | |
767 | hp->resid = 0; | |
768 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, | |
769 | "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
770 | (int) cmnd[0], (int) hp->cmd_len)); | |
771 | ||
772 | k = sg_start_req(srp, cmnd); | |
773 | if (k) { | |
774 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, | |
775 | "sg_common_write: start_req err=%d\n", k)); | |
776 | sg_finish_rem_req(srp); | |
777 | return k; /* probably out of space --> ENOMEM */ | |
778 | } | |
779 | if (atomic_read(&sdp->detaching)) { | |
780 | if (srp->bio) { | |
781 | if (srp->rq->cmd != srp->rq->__cmd) | |
782 | kfree(srp->rq->cmd); | |
783 | ||
784 | blk_end_request_all(srp->rq, -EIO); | |
785 | srp->rq = NULL; | |
786 | } | |
787 | ||
788 | sg_finish_rem_req(srp); | |
789 | return -ENODEV; | |
790 | } | |
791 | ||
792 | hp->duration = jiffies_to_msecs(jiffies); | |
793 | if (hp->interface_id != '\0' && /* v3 (or later) interface */ | |
794 | (SG_FLAG_Q_AT_TAIL & hp->flags)) | |
795 | at_head = 0; | |
796 | else | |
797 | at_head = 1; | |
798 | ||
799 | srp->rq->timeout = timeout; | |
800 | kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ | |
801 | blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, | |
802 | srp->rq, at_head, sg_rq_end_io); | |
803 | return 0; | |
804 | } | |
805 | ||
806 | static int srp_done(Sg_fd *sfp, Sg_request *srp) | |
807 | { | |
808 | unsigned long flags; | |
809 | int ret; | |
810 | ||
811 | read_lock_irqsave(&sfp->rq_list_lock, flags); | |
812 | ret = srp->done; | |
813 | read_unlock_irqrestore(&sfp->rq_list_lock, flags); | |
814 | return ret; | |
815 | } | |
816 | ||
817 | static int max_sectors_bytes(struct request_queue *q) | |
818 | { | |
819 | unsigned int max_sectors = queue_max_sectors(q); | |
820 | ||
821 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); | |
822 | ||
823 | return max_sectors << 9; | |
824 | } | |
825 | ||
826 | static long | |
827 | sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
828 | { | |
829 | void __user *p = (void __user *)arg; | |
830 | int __user *ip = p; | |
831 | int result, val, read_only; | |
832 | Sg_device *sdp; | |
833 | Sg_fd *sfp; | |
834 | Sg_request *srp; | |
835 | unsigned long iflags; | |
836 | ||
837 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
838 | return -ENXIO; | |
839 | ||
840 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, | |
841 | "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); | |
842 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); | |
843 | ||
844 | switch (cmd_in) { | |
845 | case SG_IO: | |
846 | if (atomic_read(&sdp->detaching)) | |
847 | return -ENODEV; | |
848 | if (!scsi_block_when_processing_errors(sdp->device)) | |
849 | return -ENXIO; | |
850 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) | |
851 | return -EFAULT; | |
852 | result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, | |
853 | 1, read_only, 1, &srp); | |
854 | if (result < 0) | |
855 | return result; | |
856 | result = wait_event_interruptible(sfp->read_wait, | |
857 | (srp_done(sfp, srp) || atomic_read(&sdp->detaching))); | |
858 | if (atomic_read(&sdp->detaching)) | |
859 | return -ENODEV; | |
860 | write_lock_irq(&sfp->rq_list_lock); | |
861 | if (srp->done) { | |
862 | srp->done = 2; | |
863 | write_unlock_irq(&sfp->rq_list_lock); | |
864 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); | |
865 | return (result < 0) ? result : 0; | |
866 | } | |
867 | srp->orphan = 1; | |
868 | write_unlock_irq(&sfp->rq_list_lock); | |
869 | return result; /* -ERESTARTSYS because signal hit process */ | |
870 | case SG_SET_TIMEOUT: | |
871 | result = get_user(val, ip); | |
872 | if (result) | |
873 | return result; | |
874 | if (val < 0) | |
875 | return -EIO; | |
876 | if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ)) | |
877 | val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ), | |
878 | INT_MAX); | |
879 | sfp->timeout_user = val; | |
880 | sfp->timeout = mult_frac(val, HZ, USER_HZ); | |
881 | ||
882 | return 0; | |
883 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
884 | /* strange ..., for backward compatibility */ | |
885 | return sfp->timeout_user; | |
886 | case SG_SET_FORCE_LOW_DMA: | |
887 | result = get_user(val, ip); | |
888 | if (result) | |
889 | return result; | |
890 | if (val) { | |
891 | sfp->low_dma = 1; | |
892 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { | |
893 | val = (int) sfp->reserve.bufflen; | |
894 | sg_remove_scat(sfp, &sfp->reserve); | |
895 | sg_build_reserve(sfp, val); | |
896 | } | |
897 | } else { | |
898 | if (atomic_read(&sdp->detaching)) | |
899 | return -ENODEV; | |
900 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; | |
901 | } | |
902 | return 0; | |
903 | case SG_GET_LOW_DMA: | |
904 | return put_user((int) sfp->low_dma, ip); | |
905 | case SG_GET_SCSI_ID: | |
906 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) | |
907 | return -EFAULT; | |
908 | else { | |
909 | sg_scsi_id_t __user *sg_idp = p; | |
910 | ||
911 | if (atomic_read(&sdp->detaching)) | |
912 | return -ENODEV; | |
913 | __put_user((int) sdp->device->host->host_no, | |
914 | &sg_idp->host_no); | |
915 | __put_user((int) sdp->device->channel, | |
916 | &sg_idp->channel); | |
917 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); | |
918 | __put_user((int) sdp->device->lun, &sg_idp->lun); | |
919 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); | |
920 | __put_user((short) sdp->device->host->cmd_per_lun, | |
921 | &sg_idp->h_cmd_per_lun); | |
922 | __put_user((short) sdp->device->queue_depth, | |
923 | &sg_idp->d_queue_depth); | |
924 | __put_user(0, &sg_idp->unused[0]); | |
925 | __put_user(0, &sg_idp->unused[1]); | |
926 | return 0; | |
927 | } | |
928 | case SG_SET_FORCE_PACK_ID: | |
929 | result = get_user(val, ip); | |
930 | if (result) | |
931 | return result; | |
932 | sfp->force_packid = val ? 1 : 0; | |
933 | return 0; | |
934 | case SG_GET_PACK_ID: | |
935 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) | |
936 | return -EFAULT; | |
937 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
938 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
939 | if ((1 == srp->done) && (!srp->sg_io_owned)) { | |
940 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
941 | iflags); | |
942 | __put_user(srp->header.pack_id, ip); | |
943 | return 0; | |
944 | } | |
945 | } | |
946 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
947 | __put_user(-1, ip); | |
948 | return 0; | |
949 | case SG_GET_NUM_WAITING: | |
950 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
951 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { | |
952 | if ((1 == srp->done) && (!srp->sg_io_owned)) | |
953 | ++val; | |
954 | } | |
955 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
956 | return put_user(val, ip); | |
957 | case SG_GET_SG_TABLESIZE: | |
958 | return put_user(sdp->sg_tablesize, ip); | |
959 | case SG_SET_RESERVED_SIZE: | |
960 | result = get_user(val, ip); | |
961 | if (result) | |
962 | return result; | |
963 | if (val < 0) | |
964 | return -EINVAL; | |
965 | val = min_t(int, val, | |
966 | max_sectors_bytes(sdp->device->request_queue)); | |
967 | if (val != sfp->reserve.bufflen) { | |
968 | if (sg_res_in_use(sfp) || sfp->mmap_called) | |
969 | return -EBUSY; | |
970 | sg_remove_scat(sfp, &sfp->reserve); | |
971 | sg_build_reserve(sfp, val); | |
972 | } | |
973 | return 0; | |
974 | case SG_GET_RESERVED_SIZE: | |
975 | val = min_t(int, sfp->reserve.bufflen, | |
976 | max_sectors_bytes(sdp->device->request_queue)); | |
977 | return put_user(val, ip); | |
978 | case SG_SET_COMMAND_Q: | |
979 | result = get_user(val, ip); | |
980 | if (result) | |
981 | return result; | |
982 | sfp->cmd_q = val ? 1 : 0; | |
983 | return 0; | |
984 | case SG_GET_COMMAND_Q: | |
985 | return put_user((int) sfp->cmd_q, ip); | |
986 | case SG_SET_KEEP_ORPHAN: | |
987 | result = get_user(val, ip); | |
988 | if (result) | |
989 | return result; | |
990 | sfp->keep_orphan = val; | |
991 | return 0; | |
992 | case SG_GET_KEEP_ORPHAN: | |
993 | return put_user((int) sfp->keep_orphan, ip); | |
994 | case SG_NEXT_CMD_LEN: | |
995 | result = get_user(val, ip); | |
996 | if (result) | |
997 | return result; | |
998 | sfp->next_cmd_len = (val > 0) ? val : 0; | |
999 | return 0; | |
1000 | case SG_GET_VERSION_NUM: | |
1001 | return put_user(sg_version_num, ip); | |
1002 | case SG_GET_ACCESS_COUNT: | |
1003 | /* faked - we don't have a real access count anymore */ | |
1004 | val = (sdp->device ? 1 : 0); | |
1005 | return put_user(val, ip); | |
1006 | case SG_GET_REQUEST_TABLE: | |
1007 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) | |
1008 | return -EFAULT; | |
1009 | else { | |
1010 | sg_req_info_t *rinfo; | |
1011 | unsigned int ms; | |
1012 | ||
1013 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, | |
1014 | GFP_KERNEL); | |
1015 | if (!rinfo) | |
1016 | return -ENOMEM; | |
1017 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1018 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; | |
1019 | ++val, srp = srp ? srp->nextrp : srp) { | |
1020 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); | |
1021 | if (srp) { | |
1022 | rinfo[val].req_state = srp->done + 1; | |
1023 | rinfo[val].problem = | |
1024 | srp->header.masked_status & | |
1025 | srp->header.host_status & | |
1026 | srp->header.driver_status; | |
1027 | if (srp->done) | |
1028 | rinfo[val].duration = | |
1029 | srp->header.duration; | |
1030 | else { | |
1031 | ms = jiffies_to_msecs(jiffies); | |
1032 | rinfo[val].duration = | |
1033 | (ms > srp->header.duration) ? | |
1034 | (ms - srp->header.duration) : 0; | |
1035 | } | |
1036 | rinfo[val].orphan = srp->orphan; | |
1037 | rinfo[val].sg_io_owned = | |
1038 | srp->sg_io_owned; | |
1039 | rinfo[val].pack_id = | |
1040 | srp->header.pack_id; | |
1041 | rinfo[val].usr_ptr = | |
1042 | srp->header.usr_ptr; | |
1043 | } | |
1044 | } | |
1045 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1046 | result = __copy_to_user(p, rinfo, | |
1047 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
1048 | result = result ? -EFAULT : 0; | |
1049 | kfree(rinfo); | |
1050 | return result; | |
1051 | } | |
1052 | case SG_EMULATED_HOST: | |
1053 | if (atomic_read(&sdp->detaching)) | |
1054 | return -ENODEV; | |
1055 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1056 | case SCSI_IOCTL_SEND_COMMAND: | |
1057 | if (atomic_read(&sdp->detaching)) | |
1058 | return -ENODEV; | |
1059 | if (read_only) { | |
1060 | unsigned char opcode = WRITE_6; | |
1061 | Scsi_Ioctl_Command __user *siocp = p; | |
1062 | ||
1063 | if (copy_from_user(&opcode, siocp->data, 1)) | |
1064 | return -EFAULT; | |
1065 | if (sg_allow_access(filp, &opcode)) | |
1066 | return -EPERM; | |
1067 | } | |
1068 | return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); | |
1069 | case SG_SET_DEBUG: | |
1070 | result = get_user(val, ip); | |
1071 | if (result) | |
1072 | return result; | |
1073 | sdp->sgdebug = (char) val; | |
1074 | return 0; | |
1075 | case BLKSECTGET: | |
1076 | return put_user(max_sectors_bytes(sdp->device->request_queue), | |
1077 | ip); | |
1078 | case BLKTRACESETUP: | |
1079 | return blk_trace_setup(sdp->device->request_queue, | |
1080 | sdp->disk->disk_name, | |
1081 | MKDEV(SCSI_GENERIC_MAJOR, sdp->index), | |
1082 | NULL, | |
1083 | (char *)arg); | |
1084 | case BLKTRACESTART: | |
1085 | return blk_trace_startstop(sdp->device->request_queue, 1); | |
1086 | case BLKTRACESTOP: | |
1087 | return blk_trace_startstop(sdp->device->request_queue, 0); | |
1088 | case BLKTRACETEARDOWN: | |
1089 | return blk_trace_remove(sdp->device->request_queue); | |
1090 | case SCSI_IOCTL_GET_IDLUN: | |
1091 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1092 | case SCSI_IOCTL_PROBE_HOST: | |
1093 | case SG_GET_TRANSFORM: | |
1094 | case SG_SCSI_RESET: | |
1095 | if (atomic_read(&sdp->detaching)) | |
1096 | return -ENODEV; | |
1097 | break; | |
1098 | default: | |
1099 | if (read_only) | |
1100 | return -EPERM; /* don't know so take safe approach */ | |
1101 | break; | |
1102 | } | |
1103 | ||
1104 | result = scsi_ioctl_block_when_processing_errors(sdp->device, | |
1105 | cmd_in, filp->f_flags & O_NDELAY); | |
1106 | if (result) | |
1107 | return result; | |
1108 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1109 | } | |
1110 | ||
1111 | #ifdef CONFIG_COMPAT | |
1112 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1113 | { | |
1114 | Sg_device *sdp; | |
1115 | Sg_fd *sfp; | |
1116 | struct scsi_device *sdev; | |
1117 | ||
1118 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1119 | return -ENXIO; | |
1120 | ||
1121 | sdev = sdp->device; | |
1122 | if (sdev->host->hostt->compat_ioctl) { | |
1123 | int ret; | |
1124 | ||
1125 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); | |
1126 | ||
1127 | return ret; | |
1128 | } | |
1129 | ||
1130 | return -ENOIOCTLCMD; | |
1131 | } | |
1132 | #endif | |
1133 | ||
1134 | static unsigned int | |
1135 | sg_poll(struct file *filp, poll_table * wait) | |
1136 | { | |
1137 | unsigned int res = 0; | |
1138 | Sg_device *sdp; | |
1139 | Sg_fd *sfp; | |
1140 | Sg_request *srp; | |
1141 | int count = 0; | |
1142 | unsigned long iflags; | |
1143 | ||
1144 | sfp = filp->private_data; | |
1145 | if (!sfp) | |
1146 | return POLLERR; | |
1147 | sdp = sfp->parentdp; | |
1148 | if (!sdp) | |
1149 | return POLLERR; | |
1150 | poll_wait(filp, &sfp->read_wait, wait); | |
1151 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1152 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
1153 | /* if any read waiting, flag it */ | |
1154 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
1155 | res = POLLIN | POLLRDNORM; | |
1156 | ++count; | |
1157 | } | |
1158 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1159 | ||
1160 | if (atomic_read(&sdp->detaching)) | |
1161 | res |= POLLHUP; | |
1162 | else if (!sfp->cmd_q) { | |
1163 | if (0 == count) | |
1164 | res |= POLLOUT | POLLWRNORM; | |
1165 | } else if (count < SG_MAX_QUEUE) | |
1166 | res |= POLLOUT | POLLWRNORM; | |
1167 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, | |
1168 | "sg_poll: res=0x%x\n", (int) res)); | |
1169 | return res; | |
1170 | } | |
1171 | ||
1172 | static int | |
1173 | sg_fasync(int fd, struct file *filp, int mode) | |
1174 | { | |
1175 | Sg_device *sdp; | |
1176 | Sg_fd *sfp; | |
1177 | ||
1178 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1179 | return -ENXIO; | |
1180 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, | |
1181 | "sg_fasync: mode=%d\n", mode)); | |
1182 | ||
1183 | return fasync_helper(fd, filp, mode, &sfp->async_qp); | |
1184 | } | |
1185 | ||
1186 | static int | |
1187 | sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1188 | { | |
1189 | Sg_fd *sfp; | |
1190 | unsigned long offset, len, sa; | |
1191 | Sg_scatter_hold *rsv_schp; | |
1192 | int k, length; | |
1193 | ||
1194 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
1195 | return VM_FAULT_SIGBUS; | |
1196 | rsv_schp = &sfp->reserve; | |
1197 | offset = vmf->pgoff << PAGE_SHIFT; | |
1198 | if (offset >= rsv_schp->bufflen) | |
1199 | return VM_FAULT_SIGBUS; | |
1200 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, | |
1201 | "sg_vma_fault: offset=%lu, scatg=%d\n", | |
1202 | offset, rsv_schp->k_use_sg)); | |
1203 | sa = vma->vm_start; | |
1204 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); | |
1205 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
1206 | len = vma->vm_end - sa; | |
1207 | len = (len < length) ? len : length; | |
1208 | if (offset < len) { | |
1209 | struct page *page = nth_page(rsv_schp->pages[k], | |
1210 | offset >> PAGE_SHIFT); | |
1211 | get_page(page); /* increment page count */ | |
1212 | vmf->page = page; | |
1213 | return 0; /* success */ | |
1214 | } | |
1215 | sa += len; | |
1216 | offset -= len; | |
1217 | } | |
1218 | ||
1219 | return VM_FAULT_SIGBUS; | |
1220 | } | |
1221 | ||
1222 | static const struct vm_operations_struct sg_mmap_vm_ops = { | |
1223 | .fault = sg_vma_fault, | |
1224 | }; | |
1225 | ||
1226 | static int | |
1227 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1228 | { | |
1229 | Sg_fd *sfp; | |
1230 | unsigned long req_sz, len, sa; | |
1231 | Sg_scatter_hold *rsv_schp; | |
1232 | int k, length; | |
1233 | ||
1234 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1235 | return -ENXIO; | |
1236 | req_sz = vma->vm_end - vma->vm_start; | |
1237 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, | |
1238 | "sg_mmap starting, vm_start=%p, len=%d\n", | |
1239 | (void *) vma->vm_start, (int) req_sz)); | |
1240 | if (vma->vm_pgoff) | |
1241 | return -EINVAL; /* want no offset */ | |
1242 | rsv_schp = &sfp->reserve; | |
1243 | if (req_sz > rsv_schp->bufflen) | |
1244 | return -ENOMEM; /* cannot map more than reserved buffer */ | |
1245 | ||
1246 | sa = vma->vm_start; | |
1247 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); | |
1248 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
1249 | len = vma->vm_end - sa; | |
1250 | len = (len < length) ? len : length; | |
1251 | sa += len; | |
1252 | } | |
1253 | ||
1254 | sfp->mmap_called = 1; | |
1255 | vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; | |
1256 | vma->vm_private_data = sfp; | |
1257 | vma->vm_ops = &sg_mmap_vm_ops; | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | static void | |
1262 | sg_rq_end_io_usercontext(struct work_struct *work) | |
1263 | { | |
1264 | struct sg_request *srp = container_of(work, struct sg_request, ew.work); | |
1265 | struct sg_fd *sfp = srp->parentfp; | |
1266 | ||
1267 | sg_finish_rem_req(srp); | |
1268 | kref_put(&sfp->f_ref, sg_remove_sfp); | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * This function is a "bottom half" handler that is called by the mid | |
1273 | * level when a command is completed (or has failed). | |
1274 | */ | |
1275 | static void | |
1276 | sg_rq_end_io(struct request *rq, int uptodate) | |
1277 | { | |
1278 | struct sg_request *srp = rq->end_io_data; | |
1279 | Sg_device *sdp; | |
1280 | Sg_fd *sfp; | |
1281 | unsigned long iflags; | |
1282 | unsigned int ms; | |
1283 | char *sense; | |
1284 | int result, resid, done = 1; | |
1285 | ||
1286 | if (WARN_ON(srp->done != 0)) | |
1287 | return; | |
1288 | ||
1289 | sfp = srp->parentfp; | |
1290 | if (WARN_ON(sfp == NULL)) | |
1291 | return; | |
1292 | ||
1293 | sdp = sfp->parentdp; | |
1294 | if (unlikely(atomic_read(&sdp->detaching))) | |
1295 | pr_info("%s: device detaching\n", __func__); | |
1296 | ||
1297 | sense = rq->sense; | |
1298 | result = rq->errors; | |
1299 | resid = rq->resid_len; | |
1300 | ||
1301 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, | |
1302 | "sg_cmd_done: pack_id=%d, res=0x%x\n", | |
1303 | srp->header.pack_id, result)); | |
1304 | srp->header.resid = resid; | |
1305 | ms = jiffies_to_msecs(jiffies); | |
1306 | srp->header.duration = (ms > srp->header.duration) ? | |
1307 | (ms - srp->header.duration) : 0; | |
1308 | if (0 != result) { | |
1309 | struct scsi_sense_hdr sshdr; | |
1310 | ||
1311 | srp->header.status = 0xff & result; | |
1312 | srp->header.masked_status = status_byte(result); | |
1313 | srp->header.msg_status = msg_byte(result); | |
1314 | srp->header.host_status = host_byte(result); | |
1315 | srp->header.driver_status = driver_byte(result); | |
1316 | if ((sdp->sgdebug > 0) && | |
1317 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1318 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
1319 | __scsi_print_sense(sdp->device, __func__, sense, | |
1320 | SCSI_SENSE_BUFFERSIZE); | |
1321 | ||
1322 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
1323 | if (driver_byte(result) != 0 | |
1324 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) | |
1325 | && !scsi_sense_is_deferred(&sshdr) | |
1326 | && sshdr.sense_key == UNIT_ATTENTION | |
1327 | && sdp->device->removable) { | |
1328 | /* Detected possible disc change. Set the bit - this */ | |
1329 | /* may be used if there are filesystems using this device */ | |
1330 | sdp->device->changed = 1; | |
1331 | } | |
1332 | } | |
1333 | /* Rely on write phase to clean out srp status values, so no "else" */ | |
1334 | ||
1335 | /* | |
1336 | * Free the request as soon as it is complete so that its resources | |
1337 | * can be reused without waiting for userspace to read() the | |
1338 | * result. But keep the associated bio (if any) around until | |
1339 | * blk_rq_unmap_user() can be called from user context. | |
1340 | */ | |
1341 | srp->rq = NULL; | |
1342 | if (rq->cmd != rq->__cmd) | |
1343 | kfree(rq->cmd); | |
1344 | __blk_put_request(rq->q, rq); | |
1345 | ||
1346 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1347 | if (unlikely(srp->orphan)) { | |
1348 | if (sfp->keep_orphan) | |
1349 | srp->sg_io_owned = 0; | |
1350 | else | |
1351 | done = 0; | |
1352 | } | |
1353 | srp->done = done; | |
1354 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1355 | ||
1356 | if (likely(done)) { | |
1357 | /* Now wake up any sg_read() that is waiting for this | |
1358 | * packet. | |
1359 | */ | |
1360 | wake_up_interruptible(&sfp->read_wait); | |
1361 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); | |
1362 | kref_put(&sfp->f_ref, sg_remove_sfp); | |
1363 | } else { | |
1364 | INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); | |
1365 | schedule_work(&srp->ew.work); | |
1366 | } | |
1367 | } | |
1368 | ||
1369 | static const struct file_operations sg_fops = { | |
1370 | .owner = THIS_MODULE, | |
1371 | .read = sg_read, | |
1372 | .write = sg_write, | |
1373 | .poll = sg_poll, | |
1374 | .unlocked_ioctl = sg_ioctl, | |
1375 | #ifdef CONFIG_COMPAT | |
1376 | .compat_ioctl = sg_compat_ioctl, | |
1377 | #endif | |
1378 | .open = sg_open, | |
1379 | .mmap = sg_mmap, | |
1380 | .release = sg_release, | |
1381 | .fasync = sg_fasync, | |
1382 | .llseek = no_llseek, | |
1383 | }; | |
1384 | ||
1385 | static struct class *sg_sysfs_class; | |
1386 | ||
1387 | static int sg_sysfs_valid = 0; | |
1388 | ||
1389 | static Sg_device * | |
1390 | sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) | |
1391 | { | |
1392 | struct request_queue *q = scsidp->request_queue; | |
1393 | Sg_device *sdp; | |
1394 | unsigned long iflags; | |
1395 | int error; | |
1396 | u32 k; | |
1397 | ||
1398 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); | |
1399 | if (!sdp) { | |
1400 | sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " | |
1401 | "failure\n", __func__); | |
1402 | return ERR_PTR(-ENOMEM); | |
1403 | } | |
1404 | ||
1405 | idr_preload(GFP_KERNEL); | |
1406 | write_lock_irqsave(&sg_index_lock, iflags); | |
1407 | ||
1408 | error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); | |
1409 | if (error < 0) { | |
1410 | if (error == -ENOSPC) { | |
1411 | sdev_printk(KERN_WARNING, scsidp, | |
1412 | "Unable to attach sg device type=%d, minor number exceeds %d\n", | |
1413 | scsidp->type, SG_MAX_DEVS - 1); | |
1414 | error = -ENODEV; | |
1415 | } else { | |
1416 | sdev_printk(KERN_WARNING, scsidp, "%s: idr " | |
1417 | "allocation Sg_device failure: %d\n", | |
1418 | __func__, error); | |
1419 | } | |
1420 | goto out_unlock; | |
1421 | } | |
1422 | k = error; | |
1423 | ||
1424 | SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, | |
1425 | "sg_alloc: dev=%d \n", k)); | |
1426 | sprintf(disk->disk_name, "sg%d", k); | |
1427 | disk->first_minor = k; | |
1428 | sdp->disk = disk; | |
1429 | sdp->device = scsidp; | |
1430 | mutex_init(&sdp->open_rel_lock); | |
1431 | INIT_LIST_HEAD(&sdp->sfds); | |
1432 | init_waitqueue_head(&sdp->open_wait); | |
1433 | atomic_set(&sdp->detaching, 0); | |
1434 | rwlock_init(&sdp->sfd_lock); | |
1435 | sdp->sg_tablesize = queue_max_segments(q); | |
1436 | sdp->index = k; | |
1437 | kref_init(&sdp->d_ref); | |
1438 | error = 0; | |
1439 | ||
1440 | out_unlock: | |
1441 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1442 | idr_preload_end(); | |
1443 | ||
1444 | if (error) { | |
1445 | kfree(sdp); | |
1446 | return ERR_PTR(error); | |
1447 | } | |
1448 | return sdp; | |
1449 | } | |
1450 | ||
1451 | static int | |
1452 | sg_add_device(struct device *cl_dev, struct class_interface *cl_intf) | |
1453 | { | |
1454 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); | |
1455 | struct gendisk *disk; | |
1456 | Sg_device *sdp = NULL; | |
1457 | struct cdev * cdev = NULL; | |
1458 | int error; | |
1459 | unsigned long iflags; | |
1460 | ||
1461 | disk = alloc_disk(1); | |
1462 | if (!disk) { | |
1463 | pr_warn("%s: alloc_disk failed\n", __func__); | |
1464 | return -ENOMEM; | |
1465 | } | |
1466 | disk->major = SCSI_GENERIC_MAJOR; | |
1467 | ||
1468 | error = -ENOMEM; | |
1469 | cdev = cdev_alloc(); | |
1470 | if (!cdev) { | |
1471 | pr_warn("%s: cdev_alloc failed\n", __func__); | |
1472 | goto out; | |
1473 | } | |
1474 | cdev->owner = THIS_MODULE; | |
1475 | cdev->ops = &sg_fops; | |
1476 | ||
1477 | sdp = sg_alloc(disk, scsidp); | |
1478 | if (IS_ERR(sdp)) { | |
1479 | pr_warn("%s: sg_alloc failed\n", __func__); | |
1480 | error = PTR_ERR(sdp); | |
1481 | goto out; | |
1482 | } | |
1483 | ||
1484 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); | |
1485 | if (error) | |
1486 | goto cdev_add_err; | |
1487 | ||
1488 | sdp->cdev = cdev; | |
1489 | if (sg_sysfs_valid) { | |
1490 | struct device *sg_class_member; | |
1491 | ||
1492 | sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, | |
1493 | MKDEV(SCSI_GENERIC_MAJOR, | |
1494 | sdp->index), | |
1495 | sdp, "%s", disk->disk_name); | |
1496 | if (IS_ERR(sg_class_member)) { | |
1497 | pr_err("%s: device_create failed\n", __func__); | |
1498 | error = PTR_ERR(sg_class_member); | |
1499 | goto cdev_add_err; | |
1500 | } | |
1501 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, | |
1502 | &sg_class_member->kobj, "generic"); | |
1503 | if (error) | |
1504 | pr_err("%s: unable to make symlink 'generic' back " | |
1505 | "to sg%d\n", __func__, sdp->index); | |
1506 | } else | |
1507 | pr_warn("%s: sg_sys Invalid\n", __func__); | |
1508 | ||
1509 | sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d " | |
1510 | "type %d\n", sdp->index, scsidp->type); | |
1511 | ||
1512 | dev_set_drvdata(cl_dev, sdp); | |
1513 | ||
1514 | return 0; | |
1515 | ||
1516 | cdev_add_err: | |
1517 | write_lock_irqsave(&sg_index_lock, iflags); | |
1518 | idr_remove(&sg_index_idr, sdp->index); | |
1519 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1520 | kfree(sdp); | |
1521 | ||
1522 | out: | |
1523 | put_disk(disk); | |
1524 | if (cdev) | |
1525 | cdev_del(cdev); | |
1526 | return error; | |
1527 | } | |
1528 | ||
1529 | static void | |
1530 | sg_device_destroy(struct kref *kref) | |
1531 | { | |
1532 | struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); | |
1533 | unsigned long flags; | |
1534 | ||
1535 | /* CAUTION! Note that the device can still be found via idr_find() | |
1536 | * even though the refcount is 0. Therefore, do idr_remove() BEFORE | |
1537 | * any other cleanup. | |
1538 | */ | |
1539 | ||
1540 | write_lock_irqsave(&sg_index_lock, flags); | |
1541 | idr_remove(&sg_index_idr, sdp->index); | |
1542 | write_unlock_irqrestore(&sg_index_lock, flags); | |
1543 | ||
1544 | SCSI_LOG_TIMEOUT(3, | |
1545 | sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); | |
1546 | ||
1547 | put_disk(sdp->disk); | |
1548 | kfree(sdp); | |
1549 | } | |
1550 | ||
1551 | static void | |
1552 | sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) | |
1553 | { | |
1554 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); | |
1555 | Sg_device *sdp = dev_get_drvdata(cl_dev); | |
1556 | unsigned long iflags; | |
1557 | Sg_fd *sfp; | |
1558 | int val; | |
1559 | ||
1560 | if (!sdp) | |
1561 | return; | |
1562 | /* want sdp->detaching non-zero as soon as possible */ | |
1563 | val = atomic_inc_return(&sdp->detaching); | |
1564 | if (val > 1) | |
1565 | return; /* only want to do following once per device */ | |
1566 | ||
1567 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, | |
1568 | "%s\n", __func__)); | |
1569 | ||
1570 | read_lock_irqsave(&sdp->sfd_lock, iflags); | |
1571 | list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { | |
1572 | wake_up_interruptible_all(&sfp->read_wait); | |
1573 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); | |
1574 | } | |
1575 | wake_up_interruptible_all(&sdp->open_wait); | |
1576 | read_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
1577 | ||
1578 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
1579 | device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); | |
1580 | cdev_del(sdp->cdev); | |
1581 | sdp->cdev = NULL; | |
1582 | ||
1583 | kref_put(&sdp->d_ref, sg_device_destroy); | |
1584 | } | |
1585 | ||
1586 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); | |
1587 | module_param_named(def_reserved_size, def_reserved_size, int, | |
1588 | S_IRUGO | S_IWUSR); | |
1589 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); | |
1590 | ||
1591 | MODULE_AUTHOR("Douglas Gilbert"); | |
1592 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1593 | MODULE_LICENSE("GPL"); | |
1594 | MODULE_VERSION(SG_VERSION_STR); | |
1595 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); | |
1596 | ||
1597 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " | |
1598 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); | |
1599 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); | |
1600 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1601 | ||
1602 | static int __init | |
1603 | init_sg(void) | |
1604 | { | |
1605 | int rc; | |
1606 | ||
1607 | if (scatter_elem_sz < PAGE_SIZE) { | |
1608 | scatter_elem_sz = PAGE_SIZE; | |
1609 | scatter_elem_sz_prev = scatter_elem_sz; | |
1610 | } | |
1611 | if (def_reserved_size >= 0) | |
1612 | sg_big_buff = def_reserved_size; | |
1613 | else | |
1614 | def_reserved_size = sg_big_buff; | |
1615 | ||
1616 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1617 | SG_MAX_DEVS, "sg"); | |
1618 | if (rc) | |
1619 | return rc; | |
1620 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); | |
1621 | if ( IS_ERR(sg_sysfs_class) ) { | |
1622 | rc = PTR_ERR(sg_sysfs_class); | |
1623 | goto err_out; | |
1624 | } | |
1625 | sg_sysfs_valid = 1; | |
1626 | rc = scsi_register_interface(&sg_interface); | |
1627 | if (0 == rc) { | |
1628 | #ifdef CONFIG_SCSI_PROC_FS | |
1629 | sg_proc_init(); | |
1630 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1631 | return 0; | |
1632 | } | |
1633 | class_destroy(sg_sysfs_class); | |
1634 | err_out: | |
1635 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1636 | return rc; | |
1637 | } | |
1638 | ||
1639 | static void __exit | |
1640 | exit_sg(void) | |
1641 | { | |
1642 | #ifdef CONFIG_SCSI_PROC_FS | |
1643 | sg_proc_cleanup(); | |
1644 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1645 | scsi_unregister_interface(&sg_interface); | |
1646 | class_destroy(sg_sysfs_class); | |
1647 | sg_sysfs_valid = 0; | |
1648 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1649 | SG_MAX_DEVS); | |
1650 | idr_destroy(&sg_index_idr); | |
1651 | } | |
1652 | ||
1653 | static int | |
1654 | sg_start_req(Sg_request *srp, unsigned char *cmd) | |
1655 | { | |
1656 | int res; | |
1657 | struct request *rq; | |
1658 | Sg_fd *sfp = srp->parentfp; | |
1659 | sg_io_hdr_t *hp = &srp->header; | |
1660 | int dxfer_len = (int) hp->dxfer_len; | |
1661 | int dxfer_dir = hp->dxfer_direction; | |
1662 | unsigned int iov_count = hp->iovec_count; | |
1663 | Sg_scatter_hold *req_schp = &srp->data; | |
1664 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1665 | struct request_queue *q = sfp->parentdp->device->request_queue; | |
1666 | struct rq_map_data *md, map_data; | |
1667 | int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; | |
1668 | unsigned char *long_cmdp = NULL; | |
1669 | ||
1670 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, | |
1671 | "sg_start_req: dxfer_len=%d\n", | |
1672 | dxfer_len)); | |
1673 | ||
1674 | if (hp->cmd_len > BLK_MAX_CDB) { | |
1675 | long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL); | |
1676 | if (!long_cmdp) | |
1677 | return -ENOMEM; | |
1678 | } | |
1679 | ||
1680 | /* | |
1681 | * NOTE | |
1682 | * | |
1683 | * With scsi-mq enabled, there are a fixed number of preallocated | |
1684 | * requests equal in number to shost->can_queue. If all of the | |
1685 | * preallocated requests are already in use, then using GFP_ATOMIC with | |
1686 | * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL | |
1687 | * will cause blk_get_request() to sleep until an active command | |
1688 | * completes, freeing up a request. Neither option is ideal, but | |
1689 | * GFP_KERNEL is the better choice to prevent userspace from getting an | |
1690 | * unexpected EWOULDBLOCK. | |
1691 | * | |
1692 | * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually | |
1693 | * does not sleep except under memory pressure. | |
1694 | */ | |
1695 | rq = blk_get_request(q, rw, GFP_KERNEL); | |
1696 | if (IS_ERR(rq)) { | |
1697 | kfree(long_cmdp); | |
1698 | return PTR_ERR(rq); | |
1699 | } | |
1700 | ||
1701 | blk_rq_set_block_pc(rq); | |
1702 | ||
1703 | if (hp->cmd_len > BLK_MAX_CDB) | |
1704 | rq->cmd = long_cmdp; | |
1705 | memcpy(rq->cmd, cmd, hp->cmd_len); | |
1706 | rq->cmd_len = hp->cmd_len; | |
1707 | ||
1708 | srp->rq = rq; | |
1709 | rq->end_io_data = srp; | |
1710 | rq->sense = srp->sense_b; | |
1711 | rq->retries = SG_DEFAULT_RETRIES; | |
1712 | ||
1713 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) | |
1714 | return 0; | |
1715 | ||
1716 | if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && | |
1717 | dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && | |
1718 | !sfp->parentdp->device->host->unchecked_isa_dma && | |
1719 | blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) | |
1720 | md = NULL; | |
1721 | else | |
1722 | md = &map_data; | |
1723 | ||
1724 | if (md) { | |
1725 | if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) | |
1726 | sg_link_reserve(sfp, srp, dxfer_len); | |
1727 | else { | |
1728 | res = sg_build_indirect(req_schp, sfp, dxfer_len); | |
1729 | if (res) | |
1730 | return res; | |
1731 | } | |
1732 | ||
1733 | md->pages = req_schp->pages; | |
1734 | md->page_order = req_schp->page_order; | |
1735 | md->nr_entries = req_schp->k_use_sg; | |
1736 | md->offset = 0; | |
1737 | md->null_mapped = hp->dxferp ? 0 : 1; | |
1738 | if (dxfer_dir == SG_DXFER_TO_FROM_DEV) | |
1739 | md->from_user = 1; | |
1740 | else | |
1741 | md->from_user = 0; | |
1742 | } | |
1743 | ||
1744 | if (iov_count) { | |
1745 | struct iovec *iov = NULL; | |
1746 | struct iov_iter i; | |
1747 | ||
1748 | res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i); | |
1749 | if (res < 0) | |
1750 | return res; | |
1751 | ||
1752 | iov_iter_truncate(&i, hp->dxfer_len); | |
1753 | ||
1754 | res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC); | |
1755 | kfree(iov); | |
1756 | } else | |
1757 | res = blk_rq_map_user(q, rq, md, hp->dxferp, | |
1758 | hp->dxfer_len, GFP_ATOMIC); | |
1759 | ||
1760 | if (!res) { | |
1761 | srp->bio = rq->bio; | |
1762 | ||
1763 | if (!md) { | |
1764 | req_schp->dio_in_use = 1; | |
1765 | hp->info |= SG_INFO_DIRECT_IO; | |
1766 | } | |
1767 | } | |
1768 | return res; | |
1769 | } | |
1770 | ||
1771 | static int | |
1772 | sg_finish_rem_req(Sg_request *srp) | |
1773 | { | |
1774 | int ret = 0; | |
1775 | ||
1776 | Sg_fd *sfp = srp->parentfp; | |
1777 | Sg_scatter_hold *req_schp = &srp->data; | |
1778 | ||
1779 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, | |
1780 | "sg_finish_rem_req: res_used=%d\n", | |
1781 | (int) srp->res_used)); | |
1782 | if (srp->bio) | |
1783 | ret = blk_rq_unmap_user(srp->bio); | |
1784 | ||
1785 | if (srp->rq) { | |
1786 | if (srp->rq->cmd != srp->rq->__cmd) | |
1787 | kfree(srp->rq->cmd); | |
1788 | blk_put_request(srp->rq); | |
1789 | } | |
1790 | ||
1791 | if (srp->res_used) | |
1792 | sg_unlink_reserve(sfp, srp); | |
1793 | else | |
1794 | sg_remove_scat(sfp, req_schp); | |
1795 | ||
1796 | sg_remove_request(sfp, srp); | |
1797 | ||
1798 | return ret; | |
1799 | } | |
1800 | ||
1801 | static int | |
1802 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1803 | { | |
1804 | int sg_bufflen = tablesize * sizeof(struct page *); | |
1805 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; | |
1806 | ||
1807 | schp->pages = kzalloc(sg_bufflen, gfp_flags); | |
1808 | if (!schp->pages) | |
1809 | return -ENOMEM; | |
1810 | schp->sglist_len = sg_bufflen; | |
1811 | return tablesize; /* number of scat_gath elements allocated */ | |
1812 | } | |
1813 | ||
1814 | static int | |
1815 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1816 | { | |
1817 | int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; | |
1818 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1819 | int blk_size = buff_size, order; | |
1820 | gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; | |
1821 | ||
1822 | if (blk_size < 0) | |
1823 | return -EFAULT; | |
1824 | if (0 == blk_size) | |
1825 | ++blk_size; /* don't know why */ | |
1826 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ | |
1827 | blk_size = ALIGN(blk_size, SG_SECTOR_SZ); | |
1828 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, | |
1829 | "sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1830 | buff_size, blk_size)); | |
1831 | ||
1832 | /* N.B. ret_sz carried into this block ... */ | |
1833 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1834 | if (mx_sc_elems < 0) | |
1835 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1836 | ||
1837 | num = scatter_elem_sz; | |
1838 | if (unlikely(num != scatter_elem_sz_prev)) { | |
1839 | if (num < PAGE_SIZE) { | |
1840 | scatter_elem_sz = PAGE_SIZE; | |
1841 | scatter_elem_sz_prev = PAGE_SIZE; | |
1842 | } else | |
1843 | scatter_elem_sz_prev = num; | |
1844 | } | |
1845 | ||
1846 | if (sfp->low_dma) | |
1847 | gfp_mask |= GFP_DMA; | |
1848 | ||
1849 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1850 | gfp_mask |= __GFP_ZERO; | |
1851 | ||
1852 | order = get_order(num); | |
1853 | retry: | |
1854 | ret_sz = 1 << (PAGE_SHIFT + order); | |
1855 | ||
1856 | for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; | |
1857 | k++, rem_sz -= ret_sz) { | |
1858 | ||
1859 | num = (rem_sz > scatter_elem_sz_prev) ? | |
1860 | scatter_elem_sz_prev : rem_sz; | |
1861 | ||
1862 | schp->pages[k] = alloc_pages(gfp_mask, order); | |
1863 | if (!schp->pages[k]) | |
1864 | goto out; | |
1865 | ||
1866 | if (num == scatter_elem_sz_prev) { | |
1867 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { | |
1868 | scatter_elem_sz = ret_sz; | |
1869 | scatter_elem_sz_prev = ret_sz; | |
1870 | } | |
1871 | } | |
1872 | ||
1873 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, | |
1874 | "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", | |
1875 | k, num, ret_sz)); | |
1876 | } /* end of for loop */ | |
1877 | ||
1878 | schp->page_order = order; | |
1879 | schp->k_use_sg = k; | |
1880 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, | |
1881 | "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", | |
1882 | k, rem_sz)); | |
1883 | ||
1884 | schp->bufflen = blk_size; | |
1885 | if (rem_sz > 0) /* must have failed */ | |
1886 | return -ENOMEM; | |
1887 | return 0; | |
1888 | out: | |
1889 | for (i = 0; i < k; i++) | |
1890 | __free_pages(schp->pages[i], order); | |
1891 | ||
1892 | if (--order >= 0) | |
1893 | goto retry; | |
1894 | ||
1895 | return -ENOMEM; | |
1896 | } | |
1897 | ||
1898 | static void | |
1899 | sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) | |
1900 | { | |
1901 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, | |
1902 | "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
1903 | if (schp->pages && schp->sglist_len > 0) { | |
1904 | if (!schp->dio_in_use) { | |
1905 | int k; | |
1906 | ||
1907 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { | |
1908 | SCSI_LOG_TIMEOUT(5, | |
1909 | sg_printk(KERN_INFO, sfp->parentdp, | |
1910 | "sg_remove_scat: k=%d, pg=0x%p\n", | |
1911 | k, schp->pages[k])); | |
1912 | __free_pages(schp->pages[k], schp->page_order); | |
1913 | } | |
1914 | ||
1915 | kfree(schp->pages); | |
1916 | } | |
1917 | } | |
1918 | memset(schp, 0, sizeof (*schp)); | |
1919 | } | |
1920 | ||
1921 | static int | |
1922 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
1923 | { | |
1924 | Sg_scatter_hold *schp = &srp->data; | |
1925 | int k, num; | |
1926 | ||
1927 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, | |
1928 | "sg_read_oxfer: num_read_xfer=%d\n", | |
1929 | num_read_xfer)); | |
1930 | if ((!outp) || (num_read_xfer <= 0)) | |
1931 | return 0; | |
1932 | ||
1933 | num = 1 << (PAGE_SHIFT + schp->page_order); | |
1934 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { | |
1935 | if (num > num_read_xfer) { | |
1936 | if (__copy_to_user(outp, page_address(schp->pages[k]), | |
1937 | num_read_xfer)) | |
1938 | return -EFAULT; | |
1939 | break; | |
1940 | } else { | |
1941 | if (__copy_to_user(outp, page_address(schp->pages[k]), | |
1942 | num)) | |
1943 | return -EFAULT; | |
1944 | num_read_xfer -= num; | |
1945 | if (num_read_xfer <= 0) | |
1946 | break; | |
1947 | outp += num; | |
1948 | } | |
1949 | } | |
1950 | ||
1951 | return 0; | |
1952 | } | |
1953 | ||
1954 | static void | |
1955 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
1956 | { | |
1957 | Sg_scatter_hold *schp = &sfp->reserve; | |
1958 | ||
1959 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, | |
1960 | "sg_build_reserve: req_size=%d\n", req_size)); | |
1961 | do { | |
1962 | if (req_size < PAGE_SIZE) | |
1963 | req_size = PAGE_SIZE; | |
1964 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
1965 | return; | |
1966 | else | |
1967 | sg_remove_scat(sfp, schp); | |
1968 | req_size >>= 1; /* divide by 2 */ | |
1969 | } while (req_size > (PAGE_SIZE / 2)); | |
1970 | } | |
1971 | ||
1972 | static void | |
1973 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
1974 | { | |
1975 | Sg_scatter_hold *req_schp = &srp->data; | |
1976 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1977 | int k, num, rem; | |
1978 | ||
1979 | srp->res_used = 1; | |
1980 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, | |
1981 | "sg_link_reserve: size=%d\n", size)); | |
1982 | rem = size; | |
1983 | ||
1984 | num = 1 << (PAGE_SHIFT + rsv_schp->page_order); | |
1985 | for (k = 0; k < rsv_schp->k_use_sg; k++) { | |
1986 | if (rem <= num) { | |
1987 | req_schp->k_use_sg = k + 1; | |
1988 | req_schp->sglist_len = rsv_schp->sglist_len; | |
1989 | req_schp->pages = rsv_schp->pages; | |
1990 | ||
1991 | req_schp->bufflen = size; | |
1992 | req_schp->page_order = rsv_schp->page_order; | |
1993 | break; | |
1994 | } else | |
1995 | rem -= num; | |
1996 | } | |
1997 | ||
1998 | if (k >= rsv_schp->k_use_sg) | |
1999 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, | |
2000 | "sg_link_reserve: BAD size\n")); | |
2001 | } | |
2002 | ||
2003 | static void | |
2004 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2005 | { | |
2006 | Sg_scatter_hold *req_schp = &srp->data; | |
2007 | ||
2008 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, | |
2009 | "sg_unlink_reserve: req->k_use_sg=%d\n", | |
2010 | (int) req_schp->k_use_sg)); | |
2011 | req_schp->k_use_sg = 0; | |
2012 | req_schp->bufflen = 0; | |
2013 | req_schp->pages = NULL; | |
2014 | req_schp->page_order = 0; | |
2015 | req_schp->sglist_len = 0; | |
2016 | sfp->save_scat_len = 0; | |
2017 | srp->res_used = 0; | |
2018 | } | |
2019 | ||
2020 | static Sg_request * | |
2021 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
2022 | { | |
2023 | Sg_request *resp; | |
2024 | unsigned long iflags; | |
2025 | ||
2026 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2027 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { | |
2028 | /* look for requests that are ready + not SG_IO owned */ | |
2029 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
2030 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
2031 | resp->done = 2; /* guard against other readers */ | |
2032 | break; | |
2033 | } | |
2034 | } | |
2035 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2036 | return resp; | |
2037 | } | |
2038 | ||
2039 | /* always adds to end of list */ | |
2040 | static Sg_request * | |
2041 | sg_add_request(Sg_fd * sfp) | |
2042 | { | |
2043 | int k; | |
2044 | unsigned long iflags; | |
2045 | Sg_request *resp; | |
2046 | Sg_request *rp = sfp->req_arr; | |
2047 | ||
2048 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2049 | resp = sfp->headrp; | |
2050 | if (!resp) { | |
2051 | memset(rp, 0, sizeof (Sg_request)); | |
2052 | rp->parentfp = sfp; | |
2053 | resp = rp; | |
2054 | sfp->headrp = resp; | |
2055 | } else { | |
2056 | if (0 == sfp->cmd_q) | |
2057 | resp = NULL; /* command queuing disallowed */ | |
2058 | else { | |
2059 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2060 | if (!rp->parentfp) | |
2061 | break; | |
2062 | } | |
2063 | if (k < SG_MAX_QUEUE) { | |
2064 | memset(rp, 0, sizeof (Sg_request)); | |
2065 | rp->parentfp = sfp; | |
2066 | while (resp->nextrp) | |
2067 | resp = resp->nextrp; | |
2068 | resp->nextrp = rp; | |
2069 | resp = rp; | |
2070 | } else | |
2071 | resp = NULL; | |
2072 | } | |
2073 | } | |
2074 | if (resp) { | |
2075 | resp->nextrp = NULL; | |
2076 | resp->header.duration = jiffies_to_msecs(jiffies); | |
2077 | } | |
2078 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2079 | return resp; | |
2080 | } | |
2081 | ||
2082 | /* Return of 1 for found; 0 for not found */ | |
2083 | static int | |
2084 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2085 | { | |
2086 | Sg_request *prev_rp; | |
2087 | Sg_request *rp; | |
2088 | unsigned long iflags; | |
2089 | int res = 0; | |
2090 | ||
2091 | if ((!sfp) || (!srp) || (!sfp->headrp)) | |
2092 | return res; | |
2093 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2094 | prev_rp = sfp->headrp; | |
2095 | if (srp == prev_rp) { | |
2096 | sfp->headrp = prev_rp->nextrp; | |
2097 | prev_rp->parentfp = NULL; | |
2098 | res = 1; | |
2099 | } else { | |
2100 | while ((rp = prev_rp->nextrp)) { | |
2101 | if (srp == rp) { | |
2102 | prev_rp->nextrp = rp->nextrp; | |
2103 | rp->parentfp = NULL; | |
2104 | res = 1; | |
2105 | break; | |
2106 | } | |
2107 | prev_rp = rp; | |
2108 | } | |
2109 | } | |
2110 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2111 | return res; | |
2112 | } | |
2113 | ||
2114 | static Sg_fd * | |
2115 | sg_add_sfp(Sg_device * sdp) | |
2116 | { | |
2117 | Sg_fd *sfp; | |
2118 | unsigned long iflags; | |
2119 | int bufflen; | |
2120 | ||
2121 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); | |
2122 | if (!sfp) | |
2123 | return ERR_PTR(-ENOMEM); | |
2124 | ||
2125 | init_waitqueue_head(&sfp->read_wait); | |
2126 | rwlock_init(&sfp->rq_list_lock); | |
2127 | ||
2128 | kref_init(&sfp->f_ref); | |
2129 | sfp->timeout = SG_DEFAULT_TIMEOUT; | |
2130 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2131 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
2132 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? | |
2133 | sdp->device->host->unchecked_isa_dma : 1; | |
2134 | sfp->cmd_q = SG_DEF_COMMAND_Q; | |
2135 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2136 | sfp->parentdp = sdp; | |
2137 | write_lock_irqsave(&sdp->sfd_lock, iflags); | |
2138 | if (atomic_read(&sdp->detaching)) { | |
2139 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
2140 | return ERR_PTR(-ENODEV); | |
2141 | } | |
2142 | list_add_tail(&sfp->sfd_siblings, &sdp->sfds); | |
2143 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
2144 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, | |
2145 | "sg_add_sfp: sfp=0x%p\n", sfp)); | |
2146 | if (unlikely(sg_big_buff != def_reserved_size)) | |
2147 | sg_big_buff = def_reserved_size; | |
2148 | ||
2149 | bufflen = min_t(int, sg_big_buff, | |
2150 | max_sectors_bytes(sdp->device->request_queue)); | |
2151 | sg_build_reserve(sfp, bufflen); | |
2152 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, | |
2153 | "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", | |
2154 | sfp->reserve.bufflen, | |
2155 | sfp->reserve.k_use_sg)); | |
2156 | ||
2157 | kref_get(&sdp->d_ref); | |
2158 | __module_get(THIS_MODULE); | |
2159 | return sfp; | |
2160 | } | |
2161 | ||
2162 | static void | |
2163 | sg_remove_sfp_usercontext(struct work_struct *work) | |
2164 | { | |
2165 | struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); | |
2166 | struct sg_device *sdp = sfp->parentdp; | |
2167 | ||
2168 | /* Cleanup any responses which were never read(). */ | |
2169 | while (sfp->headrp) | |
2170 | sg_finish_rem_req(sfp->headrp); | |
2171 | ||
2172 | if (sfp->reserve.bufflen > 0) { | |
2173 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, | |
2174 | "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
2175 | (int) sfp->reserve.bufflen, | |
2176 | (int) sfp->reserve.k_use_sg)); | |
2177 | sg_remove_scat(sfp, &sfp->reserve); | |
2178 | } | |
2179 | ||
2180 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, | |
2181 | "sg_remove_sfp: sfp=0x%p\n", sfp)); | |
2182 | kfree(sfp); | |
2183 | ||
2184 | scsi_device_put(sdp->device); | |
2185 | kref_put(&sdp->d_ref, sg_device_destroy); | |
2186 | module_put(THIS_MODULE); | |
2187 | } | |
2188 | ||
2189 | static void | |
2190 | sg_remove_sfp(struct kref *kref) | |
2191 | { | |
2192 | struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); | |
2193 | struct sg_device *sdp = sfp->parentdp; | |
2194 | unsigned long iflags; | |
2195 | ||
2196 | write_lock_irqsave(&sdp->sfd_lock, iflags); | |
2197 | list_del(&sfp->sfd_siblings); | |
2198 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
2199 | ||
2200 | INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); | |
2201 | schedule_work(&sfp->ew.work); | |
2202 | } | |
2203 | ||
2204 | static int | |
2205 | sg_res_in_use(Sg_fd * sfp) | |
2206 | { | |
2207 | const Sg_request *srp; | |
2208 | unsigned long iflags; | |
2209 | ||
2210 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2211 | for (srp = sfp->headrp; srp; srp = srp->nextrp) | |
2212 | if (srp->res_used) | |
2213 | break; | |
2214 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2215 | return srp ? 1 : 0; | |
2216 | } | |
2217 | ||
2218 | #ifdef CONFIG_SCSI_PROC_FS | |
2219 | static int | |
2220 | sg_idr_max_id(int id, void *p, void *data) | |
2221 | { | |
2222 | int *k = data; | |
2223 | ||
2224 | if (*k < id) | |
2225 | *k = id; | |
2226 | ||
2227 | return 0; | |
2228 | } | |
2229 | ||
2230 | static int | |
2231 | sg_last_dev(void) | |
2232 | { | |
2233 | int k = -1; | |
2234 | unsigned long iflags; | |
2235 | ||
2236 | read_lock_irqsave(&sg_index_lock, iflags); | |
2237 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); | |
2238 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
2239 | return k + 1; /* origin 1 */ | |
2240 | } | |
2241 | #endif | |
2242 | ||
2243 | /* must be called with sg_index_lock held */ | |
2244 | static Sg_device *sg_lookup_dev(int dev) | |
2245 | { | |
2246 | return idr_find(&sg_index_idr, dev); | |
2247 | } | |
2248 | ||
2249 | static Sg_device * | |
2250 | sg_get_dev(int dev) | |
2251 | { | |
2252 | struct sg_device *sdp; | |
2253 | unsigned long flags; | |
2254 | ||
2255 | read_lock_irqsave(&sg_index_lock, flags); | |
2256 | sdp = sg_lookup_dev(dev); | |
2257 | if (!sdp) | |
2258 | sdp = ERR_PTR(-ENXIO); | |
2259 | else if (atomic_read(&sdp->detaching)) { | |
2260 | /* If sdp->detaching, then the refcount may already be 0, in | |
2261 | * which case it would be a bug to do kref_get(). | |
2262 | */ | |
2263 | sdp = ERR_PTR(-ENODEV); | |
2264 | } else | |
2265 | kref_get(&sdp->d_ref); | |
2266 | read_unlock_irqrestore(&sg_index_lock, flags); | |
2267 | ||
2268 | return sdp; | |
2269 | } | |
2270 | ||
2271 | #ifdef CONFIG_SCSI_PROC_FS | |
2272 | ||
2273 | static struct proc_dir_entry *sg_proc_sgp = NULL; | |
2274 | ||
2275 | static char sg_proc_sg_dirname[] = "scsi/sg"; | |
2276 | ||
2277 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); | |
2278 | ||
2279 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2280 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2281 | size_t count, loff_t *off); | |
2282 | static const struct file_operations adio_fops = { | |
2283 | .owner = THIS_MODULE, | |
2284 | .open = sg_proc_single_open_adio, | |
2285 | .read = seq_read, | |
2286 | .llseek = seq_lseek, | |
2287 | .write = sg_proc_write_adio, | |
2288 | .release = single_release, | |
2289 | }; | |
2290 | ||
2291 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2292 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2293 | const char __user *buffer, size_t count, loff_t *off); | |
2294 | static const struct file_operations dressz_fops = { | |
2295 | .owner = THIS_MODULE, | |
2296 | .open = sg_proc_single_open_dressz, | |
2297 | .read = seq_read, | |
2298 | .llseek = seq_lseek, | |
2299 | .write = sg_proc_write_dressz, | |
2300 | .release = single_release, | |
2301 | }; | |
2302 | ||
2303 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
2304 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); | |
2305 | static const struct file_operations version_fops = { | |
2306 | .owner = THIS_MODULE, | |
2307 | .open = sg_proc_single_open_version, | |
2308 | .read = seq_read, | |
2309 | .llseek = seq_lseek, | |
2310 | .release = single_release, | |
2311 | }; | |
2312 | ||
2313 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); | |
2314 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); | |
2315 | static const struct file_operations devhdr_fops = { | |
2316 | .owner = THIS_MODULE, | |
2317 | .open = sg_proc_single_open_devhdr, | |
2318 | .read = seq_read, | |
2319 | .llseek = seq_lseek, | |
2320 | .release = single_release, | |
2321 | }; | |
2322 | ||
2323 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); | |
2324 | static int sg_proc_open_dev(struct inode *inode, struct file *file); | |
2325 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); | |
2326 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2327 | static void dev_seq_stop(struct seq_file *s, void *v); | |
2328 | static const struct file_operations dev_fops = { | |
2329 | .owner = THIS_MODULE, | |
2330 | .open = sg_proc_open_dev, | |
2331 | .read = seq_read, | |
2332 | .llseek = seq_lseek, | |
2333 | .release = seq_release, | |
2334 | }; | |
2335 | static const struct seq_operations dev_seq_ops = { | |
2336 | .start = dev_seq_start, | |
2337 | .next = dev_seq_next, | |
2338 | .stop = dev_seq_stop, | |
2339 | .show = sg_proc_seq_show_dev, | |
2340 | }; | |
2341 | ||
2342 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
2343 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); | |
2344 | static const struct file_operations devstrs_fops = { | |
2345 | .owner = THIS_MODULE, | |
2346 | .open = sg_proc_open_devstrs, | |
2347 | .read = seq_read, | |
2348 | .llseek = seq_lseek, | |
2349 | .release = seq_release, | |
2350 | }; | |
2351 | static const struct seq_operations devstrs_seq_ops = { | |
2352 | .start = dev_seq_start, | |
2353 | .next = dev_seq_next, | |
2354 | .stop = dev_seq_stop, | |
2355 | .show = sg_proc_seq_show_devstrs, | |
2356 | }; | |
2357 | ||
2358 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
2359 | static int sg_proc_open_debug(struct inode *inode, struct file *file); | |
2360 | static const struct file_operations debug_fops = { | |
2361 | .owner = THIS_MODULE, | |
2362 | .open = sg_proc_open_debug, | |
2363 | .read = seq_read, | |
2364 | .llseek = seq_lseek, | |
2365 | .release = seq_release, | |
2366 | }; | |
2367 | static const struct seq_operations debug_seq_ops = { | |
2368 | .start = dev_seq_start, | |
2369 | .next = dev_seq_next, | |
2370 | .stop = dev_seq_stop, | |
2371 | .show = sg_proc_seq_show_debug, | |
2372 | }; | |
2373 | ||
2374 | ||
2375 | struct sg_proc_leaf { | |
2376 | const char * name; | |
2377 | const struct file_operations * fops; | |
2378 | }; | |
2379 | ||
2380 | static const struct sg_proc_leaf sg_proc_leaf_arr[] = { | |
2381 | {"allow_dio", &adio_fops}, | |
2382 | {"debug", &debug_fops}, | |
2383 | {"def_reserved_size", &dressz_fops}, | |
2384 | {"device_hdr", &devhdr_fops}, | |
2385 | {"devices", &dev_fops}, | |
2386 | {"device_strs", &devstrs_fops}, | |
2387 | {"version", &version_fops} | |
2388 | }; | |
2389 | ||
2390 | static int | |
2391 | sg_proc_init(void) | |
2392 | { | |
2393 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); | |
2394 | int k; | |
2395 | ||
2396 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); | |
2397 | if (!sg_proc_sgp) | |
2398 | return 1; | |
2399 | for (k = 0; k < num_leaves; ++k) { | |
2400 | const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; | |
2401 | umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; | |
2402 | proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); | |
2403 | } | |
2404 | return 0; | |
2405 | } | |
2406 | ||
2407 | static void | |
2408 | sg_proc_cleanup(void) | |
2409 | { | |
2410 | int k; | |
2411 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); | |
2412 | ||
2413 | if (!sg_proc_sgp) | |
2414 | return; | |
2415 | for (k = 0; k < num_leaves; ++k) | |
2416 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); | |
2417 | remove_proc_entry(sg_proc_sg_dirname, NULL); | |
2418 | } | |
2419 | ||
2420 | ||
2421 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2422 | { | |
2423 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2424 | return 0; | |
2425 | } | |
2426 | ||
2427 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2428 | { | |
2429 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2430 | } | |
2431 | ||
2432 | static ssize_t | |
2433 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2434 | size_t count, loff_t *off) | |
2435 | { | |
2436 | int err; | |
2437 | unsigned long num; | |
2438 | ||
2439 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2440 | return -EACCES; | |
2441 | err = kstrtoul_from_user(buffer, count, 0, &num); | |
2442 | if (err) | |
2443 | return err; | |
2444 | sg_allow_dio = num ? 1 : 0; | |
2445 | return count; | |
2446 | } | |
2447 | ||
2448 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2449 | { | |
2450 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2451 | } | |
2452 | ||
2453 | static ssize_t | |
2454 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2455 | size_t count, loff_t *off) | |
2456 | { | |
2457 | int err; | |
2458 | unsigned long k = ULONG_MAX; | |
2459 | ||
2460 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2461 | return -EACCES; | |
2462 | ||
2463 | err = kstrtoul_from_user(buffer, count, 0, &k); | |
2464 | if (err) | |
2465 | return err; | |
2466 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ | |
2467 | sg_big_buff = k; | |
2468 | return count; | |
2469 | } | |
2470 | return -ERANGE; | |
2471 | } | |
2472 | ||
2473 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2474 | { | |
2475 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2476 | sg_version_date); | |
2477 | return 0; | |
2478 | } | |
2479 | ||
2480 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) | |
2481 | { | |
2482 | return single_open(file, sg_proc_seq_show_version, NULL); | |
2483 | } | |
2484 | ||
2485 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) | |
2486 | { | |
2487 | seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); | |
2488 | return 0; | |
2489 | } | |
2490 | ||
2491 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) | |
2492 | { | |
2493 | return single_open(file, sg_proc_seq_show_devhdr, NULL); | |
2494 | } | |
2495 | ||
2496 | struct sg_proc_deviter { | |
2497 | loff_t index; | |
2498 | size_t max; | |
2499 | }; | |
2500 | ||
2501 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2502 | { | |
2503 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2504 | ||
2505 | s->private = it; | |
2506 | if (! it) | |
2507 | return NULL; | |
2508 | ||
2509 | it->index = *pos; | |
2510 | it->max = sg_last_dev(); | |
2511 | if (it->index >= it->max) | |
2512 | return NULL; | |
2513 | return it; | |
2514 | } | |
2515 | ||
2516 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2517 | { | |
2518 | struct sg_proc_deviter * it = s->private; | |
2519 | ||
2520 | *pos = ++it->index; | |
2521 | return (it->index < it->max) ? it : NULL; | |
2522 | } | |
2523 | ||
2524 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2525 | { | |
2526 | kfree(s->private); | |
2527 | } | |
2528 | ||
2529 | static int sg_proc_open_dev(struct inode *inode, struct file *file) | |
2530 | { | |
2531 | return seq_open(file, &dev_seq_ops); | |
2532 | } | |
2533 | ||
2534 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) | |
2535 | { | |
2536 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2537 | Sg_device *sdp; | |
2538 | struct scsi_device *scsidp; | |
2539 | unsigned long iflags; | |
2540 | ||
2541 | read_lock_irqsave(&sg_index_lock, iflags); | |
2542 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
2543 | if ((NULL == sdp) || (NULL == sdp->device) || | |
2544 | (atomic_read(&sdp->detaching))) | |
2545 | seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
2546 | else { | |
2547 | scsidp = sdp->device; | |
2548 | seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", | |
2549 | scsidp->host->host_no, scsidp->channel, | |
2550 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
2551 | 1, | |
2552 | (int) scsidp->queue_depth, | |
2553 | (int) atomic_read(&scsidp->device_busy), | |
2554 | (int) scsi_device_online(scsidp)); | |
2555 | } | |
2556 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
2557 | return 0; | |
2558 | } | |
2559 | ||
2560 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) | |
2561 | { | |
2562 | return seq_open(file, &devstrs_seq_ops); | |
2563 | } | |
2564 | ||
2565 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) | |
2566 | { | |
2567 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2568 | Sg_device *sdp; | |
2569 | struct scsi_device *scsidp; | |
2570 | unsigned long iflags; | |
2571 | ||
2572 | read_lock_irqsave(&sg_index_lock, iflags); | |
2573 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
2574 | scsidp = sdp ? sdp->device : NULL; | |
2575 | if (sdp && scsidp && (!atomic_read(&sdp->detaching))) | |
2576 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", | |
2577 | scsidp->vendor, scsidp->model, scsidp->rev); | |
2578 | else | |
2579 | seq_puts(s, "<no active device>\n"); | |
2580 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
2581 | return 0; | |
2582 | } | |
2583 | ||
2584 | /* must be called while holding sg_index_lock */ | |
2585 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) | |
2586 | { | |
2587 | int k, m, new_interface, blen, usg; | |
2588 | Sg_request *srp; | |
2589 | Sg_fd *fp; | |
2590 | const sg_io_hdr_t *hp; | |
2591 | const char * cp; | |
2592 | unsigned int ms; | |
2593 | ||
2594 | k = 0; | |
2595 | list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { | |
2596 | k++; | |
2597 | read_lock(&fp->rq_list_lock); /* irqs already disabled */ | |
2598 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " | |
2599 | "(res)sgat=%d low_dma=%d\n", k, | |
2600 | jiffies_to_msecs(fp->timeout), | |
2601 | fp->reserve.bufflen, | |
2602 | (int) fp->reserve.k_use_sg, | |
2603 | (int) fp->low_dma); | |
2604 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", | |
2605 | (int) fp->cmd_q, (int) fp->force_packid, | |
2606 | (int) fp->keep_orphan); | |
2607 | for (m = 0, srp = fp->headrp; | |
2608 | srp != NULL; | |
2609 | ++m, srp = srp->nextrp) { | |
2610 | hp = &srp->header; | |
2611 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
2612 | if (srp->res_used) { | |
2613 | if (new_interface && | |
2614 | (SG_FLAG_MMAP_IO & hp->flags)) | |
2615 | cp = " mmap>> "; | |
2616 | else | |
2617 | cp = " rb>> "; | |
2618 | } else { | |
2619 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
2620 | cp = " dio>> "; | |
2621 | else | |
2622 | cp = " "; | |
2623 | } | |
2624 | seq_puts(s, cp); | |
2625 | blen = srp->data.bufflen; | |
2626 | usg = srp->data.k_use_sg; | |
2627 | seq_puts(s, srp->done ? | |
2628 | ((1 == srp->done) ? "rcv:" : "fin:") | |
2629 | : "act:"); | |
2630 | seq_printf(s, " id=%d blen=%d", | |
2631 | srp->header.pack_id, blen); | |
2632 | if (srp->done) | |
2633 | seq_printf(s, " dur=%d", hp->duration); | |
2634 | else { | |
2635 | ms = jiffies_to_msecs(jiffies); | |
2636 | seq_printf(s, " t_o/elap=%d/%d", | |
2637 | (new_interface ? hp->timeout : | |
2638 | jiffies_to_msecs(fp->timeout)), | |
2639 | (ms > hp->duration ? ms - hp->duration : 0)); | |
2640 | } | |
2641 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, | |
2642 | (int) srp->data.cmd_opcode); | |
2643 | } | |
2644 | if (0 == m) | |
2645 | seq_puts(s, " No requests active\n"); | |
2646 | read_unlock(&fp->rq_list_lock); | |
2647 | } | |
2648 | } | |
2649 | ||
2650 | static int sg_proc_open_debug(struct inode *inode, struct file *file) | |
2651 | { | |
2652 | return seq_open(file, &debug_seq_ops); | |
2653 | } | |
2654 | ||
2655 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) | |
2656 | { | |
2657 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2658 | Sg_device *sdp; | |
2659 | unsigned long iflags; | |
2660 | ||
2661 | if (it && (0 == it->index)) | |
2662 | seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", | |
2663 | (int)it->max, sg_big_buff); | |
2664 | ||
2665 | read_lock_irqsave(&sg_index_lock, iflags); | |
2666 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
2667 | if (NULL == sdp) | |
2668 | goto skip; | |
2669 | read_lock(&sdp->sfd_lock); | |
2670 | if (!list_empty(&sdp->sfds)) { | |
2671 | seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); | |
2672 | if (atomic_read(&sdp->detaching)) | |
2673 | seq_puts(s, "detaching pending close "); | |
2674 | else if (sdp->device) { | |
2675 | struct scsi_device *scsidp = sdp->device; | |
2676 | ||
2677 | seq_printf(s, "%d:%d:%d:%llu em=%d", | |
2678 | scsidp->host->host_no, | |
2679 | scsidp->channel, scsidp->id, | |
2680 | scsidp->lun, | |
2681 | scsidp->host->hostt->emulated); | |
2682 | } | |
2683 | seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", | |
2684 | sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); | |
2685 | sg_proc_debug_helper(s, sdp); | |
2686 | } | |
2687 | read_unlock(&sdp->sfd_lock); | |
2688 | skip: | |
2689 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
2690 | return 0; | |
2691 | } | |
2692 | ||
2693 | #endif /* CONFIG_SCSI_PROC_FS */ | |
2694 | ||
2695 | module_init(init_sg); | |
2696 | module_exit(exit_sg); |