Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * History: | |
3 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), | |
4 | * to allow user process control of SCSI devices. | |
5 | * Development Sponsored by Killy Corp. NY NY | |
6 | * | |
7 | * Original driver (sg.c): | |
8 | * Copyright (C) 1992 Lawrence Foard | |
9 | * Version 2 and 3 extensions to driver: | |
65c26a0f | 10 | * Copyright (C) 1998 - 2014 Douglas Gilbert |
1da177e4 LT |
11 | * |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2, or (at your option) | |
15 | * any later version. | |
16 | * | |
17 | */ | |
18 | ||
65c26a0f DG |
19 | static int sg_version_num = 30536; /* 2 digits for each component */ |
20 | #define SG_VERSION_STR "3.5.36" | |
1da177e4 LT |
21 | |
22 | /* | |
65c26a0f | 23 | * D. P. Gilbert (dgilbert@interlog.com), notes: |
1da177e4 LT |
24 | * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First |
25 | * the kernel/module needs to be built with CONFIG_SCSI_LOGGING | |
26 | * (otherwise the macros compile to empty statements). | |
27 | * | |
28 | */ | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/fs.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/mtio.h> | |
38 | #include <linux/ioctl.h> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | #include <linux/fcntl.h> |
41 | #include <linux/init.h> | |
42 | #include <linux/poll.h> | |
1da177e4 | 43 | #include <linux/moduleparam.h> |
1da177e4 | 44 | #include <linux/cdev.h> |
7c07d613 | 45 | #include <linux/idr.h> |
1da177e4 LT |
46 | #include <linux/seq_file.h> |
47 | #include <linux/blkdev.h> | |
48 | #include <linux/delay.h> | |
6da127ad | 49 | #include <linux/blktrace_api.h> |
c45d15d2 | 50 | #include <linux/mutex.h> |
cc833acb | 51 | #include <linux/atomic.h> |
2fe038e3 | 52 | #include <linux/ratelimit.h> |
e2e40f2c | 53 | #include <linux/uio.h> |
1da177e4 LT |
54 | |
55 | #include "scsi.h" | |
db9dff36 | 56 | #include <scsi/scsi_dbg.h> |
1da177e4 LT |
57 | #include <scsi/scsi_host.h> |
58 | #include <scsi/scsi_driver.h> | |
59 | #include <scsi/scsi_ioctl.h> | |
60 | #include <scsi/sg.h> | |
61 | ||
62 | #include "scsi_logging.h" | |
63 | ||
64 | #ifdef CONFIG_SCSI_PROC_FS | |
65 | #include <linux/proc_fs.h> | |
65c26a0f | 66 | static char *sg_version_date = "20140603"; |
1da177e4 LT |
67 | |
68 | static int sg_proc_init(void); | |
69 | static void sg_proc_cleanup(void); | |
70 | #endif | |
71 | ||
1da177e4 | 72 | #define SG_ALLOW_DIO_DEF 0 |
1da177e4 LT |
73 | |
74 | #define SG_MAX_DEVS 32768 | |
75 | ||
65c26a0f DG |
76 | /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type |
77 | * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater | |
78 | * than 16 bytes are "variable length" whose length is a multiple of 4 | |
79 | */ | |
80 | #define SG_MAX_CDB_SIZE 252 | |
81 | ||
1da177e4 LT |
82 | /* |
83 | * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) | |
84 | * Then when using 32 bit integers x * m may overflow during the calculation. | |
85 | * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m | |
86 | * calculates the same, but prevents the overflow when both m and d | |
87 | * are "small" numbers (like HZ and USER_HZ). | |
88 | * Of course an overflow is inavoidable if the result of muldiv doesn't fit | |
89 | * in 32 bits. | |
90 | */ | |
91 | #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) | |
92 | ||
93 | #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) | |
94 | ||
95 | int sg_big_buff = SG_DEF_RESERVED_SIZE; | |
96 | /* N.B. This variable is readable and writeable via | |
97 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer | |
98 | of this size (or less if there is not enough memory) will be reserved | |
99 | for use by this file descriptor. [Deprecated usage: this variable is also | |
100 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into | |
101 | the kernel (i.e. it is not a module).] */ | |
102 | static int def_reserved_size = -1; /* picks up init parameter */ | |
103 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; | |
104 | ||
6460e75a DG |
105 | static int scatter_elem_sz = SG_SCATTER_SZ; |
106 | static int scatter_elem_sz_prev = SG_SCATTER_SZ; | |
107 | ||
1da177e4 | 108 | #define SG_SECTOR_SZ 512 |
1da177e4 | 109 | |
cc833acb DG |
110 | static int sg_add_device(struct device *, struct class_interface *); |
111 | static void sg_remove_device(struct device *, struct class_interface *); | |
98481ff0 | 112 | |
7c07d613 | 113 | static DEFINE_IDR(sg_index_idr); |
c0d3b9c2 JB |
114 | static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock |
115 | file descriptor list for device */ | |
1da177e4 LT |
116 | |
117 | static struct class_interface sg_interface = { | |
cc833acb DG |
118 | .add_dev = sg_add_device, |
119 | .remove_dev = sg_remove_device, | |
1da177e4 LT |
120 | }; |
121 | ||
122 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
123 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
ea312552 | 124 | unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ |
1da177e4 | 125 | unsigned bufflen; /* Size of (aggregate) data buffer */ |
10db10d1 FT |
126 | struct page **pages; |
127 | int page_order; | |
1da177e4 LT |
128 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
129 | unsigned char cmd_opcode; /* first byte of command */ | |
130 | } Sg_scatter_hold; | |
131 | ||
132 | struct sg_device; /* forward declarations */ | |
133 | struct sg_fd; | |
134 | ||
135 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
1da177e4 LT |
136 | struct sg_request *nextrp; /* NULL -> tail request (slist) */ |
137 | struct sg_fd *parentfp; /* NULL -> not in use */ | |
138 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
139 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
d6b10348 | 140 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
1da177e4 LT |
141 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
142 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
143 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
6acddc5e JE |
144 | /* done protected by rq_list_lock */ |
145 | char done; /* 0->before bh, 1->before read, 2->read */ | |
10865dfa | 146 | struct request *rq; |
6e5a30cb | 147 | struct bio *bio; |
c96952ed | 148 | struct execute_work ew; |
1da177e4 LT |
149 | } Sg_request; |
150 | ||
151 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
cc833acb | 152 | struct list_head sfd_siblings; /* protected by device's sfd_lock */ |
1da177e4 LT |
153 | struct sg_device *parentdp; /* owning device */ |
154 | wait_queue_head_t read_wait; /* queue read until command done */ | |
155 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
156 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ | |
157 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
158 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
159 | unsigned save_scat_len; /* original length of trunc. scat. element */ | |
160 | Sg_request *headrp; /* head of request slist, NULL->empty */ | |
161 | struct fasync_struct *async_qp; /* used by asynchronous notification */ | |
162 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
163 | char low_dma; /* as in parent but possibly overridden to 1 */ | |
164 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ | |
1da177e4 | 165 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ |
65c26a0f | 166 | unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ |
1da177e4 LT |
167 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ |
168 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
c6517b79 TB |
169 | struct kref f_ref; |
170 | struct execute_work ew; | |
1da177e4 LT |
171 | } Sg_fd; |
172 | ||
173 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
174 | struct scsi_device *device; | |
cc833acb DG |
175 | wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ |
176 | struct mutex open_rel_lock; /* held when in open() or release() */ | |
1da177e4 | 177 | int sg_tablesize; /* adapter's max scatter-gather table size */ |
7c07d613 | 178 | u32 index; /* device index number */ |
3442f802 | 179 | struct list_head sfds; |
cc833acb DG |
180 | rwlock_t sfd_lock; /* protect access to sfd list */ |
181 | atomic_t detaching; /* 0->device usable, 1->device detaching */ | |
182 | bool exclude; /* 1->open(O_EXCL) succeeded and is active */ | |
183 | int open_cnt; /* count of opens (perhaps < num(sfds) ) */ | |
1da177e4 LT |
184 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ |
185 | struct gendisk *disk; | |
186 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ | |
c6517b79 | 187 | struct kref d_ref; |
1da177e4 LT |
188 | } Sg_device; |
189 | ||
d6b10348 | 190 | /* tasklet or soft irq callback */ |
a91a3a20 | 191 | static void sg_rq_end_io(struct request *rq, int uptodate); |
10865dfa | 192 | static int sg_start_req(Sg_request *srp, unsigned char *cmd); |
e7ee4cc0 | 193 | static int sg_finish_rem_req(Sg_request * srp); |
1da177e4 | 194 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); |
1da177e4 LT |
195 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, |
196 | Sg_request * srp); | |
0b07de85 AG |
197 | static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, |
198 | const char __user *buf, size_t count, int blocking, | |
a2dd3b4c | 199 | int read_only, int sg_io_owned, Sg_request **o_srp); |
1da177e4 LT |
200 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, |
201 | unsigned char *cmnd, int timeout, int blocking); | |
1da177e4 | 202 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); |
95e159d6 | 203 | static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp); |
1da177e4 LT |
204 | static void sg_build_reserve(Sg_fd * sfp, int req_size); |
205 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); | |
206 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); | |
95e159d6 | 207 | static Sg_fd *sg_add_sfp(Sg_device * sdp); |
c6517b79 | 208 | static void sg_remove_sfp(struct kref *); |
1da177e4 LT |
209 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); |
210 | static Sg_request *sg_add_request(Sg_fd * sfp); | |
211 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); | |
212 | static int sg_res_in_use(Sg_fd * sfp); | |
1da177e4 | 213 | static Sg_device *sg_get_dev(int dev); |
cc833acb | 214 | static void sg_device_destroy(struct kref *kref); |
1da177e4 | 215 | |
1da177e4 LT |
216 | #define SZ_SG_HEADER sizeof(struct sg_header) |
217 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
218 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
219 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
220 | ||
95e159d6 | 221 | #define sg_printk(prefix, sdp, fmt, a...) \ |
22e0d994 HR |
222 | sdev_prefix_printk(prefix, (sdp)->device, \ |
223 | (sdp)->disk->disk_name, fmt, ##a) | |
95e159d6 | 224 | |
14e507b8 FT |
225 | static int sg_allow_access(struct file *filp, unsigned char *cmd) |
226 | { | |
35df8397 | 227 | struct sg_fd *sfp = filp->private_data; |
14e507b8 FT |
228 | |
229 | if (sfp->parentdp->device->type == TYPE_SCANNER) | |
230 | return 0; | |
231 | ||
018e0446 | 232 | return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); |
14e507b8 FT |
233 | } |
234 | ||
cc833acb DG |
235 | static int |
236 | open_wait(Sg_device *sdp, int flags) | |
98481ff0 | 237 | { |
cc833acb | 238 | int retval = 0; |
98481ff0 | 239 | |
cc833acb DG |
240 | if (flags & O_EXCL) { |
241 | while (sdp->open_cnt > 0) { | |
242 | mutex_unlock(&sdp->open_rel_lock); | |
243 | retval = wait_event_interruptible(sdp->open_wait, | |
244 | (atomic_read(&sdp->detaching) || | |
245 | !sdp->open_cnt)); | |
246 | mutex_lock(&sdp->open_rel_lock); | |
247 | ||
248 | if (retval) /* -ERESTARTSYS */ | |
249 | return retval; | |
250 | if (atomic_read(&sdp->detaching)) | |
251 | return -ENODEV; | |
252 | } | |
253 | } else { | |
254 | while (sdp->exclude) { | |
255 | mutex_unlock(&sdp->open_rel_lock); | |
256 | retval = wait_event_interruptible(sdp->open_wait, | |
257 | (atomic_read(&sdp->detaching) || | |
258 | !sdp->exclude)); | |
259 | mutex_lock(&sdp->open_rel_lock); | |
260 | ||
261 | if (retval) /* -ERESTARTSYS */ | |
262 | return retval; | |
263 | if (atomic_read(&sdp->detaching)) | |
264 | return -ENODEV; | |
265 | } | |
266 | } | |
035d12e6 | 267 | |
cc833acb | 268 | return retval; |
035d12e6 JE |
269 | } |
270 | ||
cc833acb | 271 | /* Returns 0 on success, else a negated errno value */ |
1da177e4 LT |
272 | static int |
273 | sg_open(struct inode *inode, struct file *filp) | |
274 | { | |
275 | int dev = iminor(inode); | |
276 | int flags = filp->f_flags; | |
d6b10348 | 277 | struct request_queue *q; |
1da177e4 LT |
278 | Sg_device *sdp; |
279 | Sg_fd *sfp; | |
1da177e4 LT |
280 | int retval; |
281 | ||
282 | nonseekable_open(inode, filp); | |
cc833acb DG |
283 | if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) |
284 | return -EPERM; /* Can't lock it with read only access */ | |
1da177e4 | 285 | sdp = sg_get_dev(dev); |
cc833acb DG |
286 | if (IS_ERR(sdp)) |
287 | return PTR_ERR(sdp); | |
1da177e4 | 288 | |
95e159d6 HR |
289 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
290 | "sg_open: flags=0x%x\n", flags)); | |
291 | ||
1da177e4 LT |
292 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ |
293 | /* Prevent the device driver from vanishing while we sleep */ | |
294 | retval = scsi_device_get(sdp->device); | |
c6517b79 TB |
295 | if (retval) |
296 | goto sg_put; | |
1da177e4 | 297 | |
bc4f2401 AS |
298 | retval = scsi_autopm_get_device(sdp->device); |
299 | if (retval) | |
300 | goto sdp_put; | |
301 | ||
cc833acb DG |
302 | /* scsi_block_when_processing_errors() may block so bypass |
303 | * check if O_NONBLOCK. Permits SCSI commands to be issued | |
304 | * during error recovery. Tread carefully. */ | |
1da177e4 LT |
305 | if (!((flags & O_NONBLOCK) || |
306 | scsi_block_when_processing_errors(sdp->device))) { | |
307 | retval = -ENXIO; | |
308 | /* we are in error recovery for this device */ | |
309 | goto error_out; | |
310 | } | |
311 | ||
cc833acb DG |
312 | mutex_lock(&sdp->open_rel_lock); |
313 | if (flags & O_NONBLOCK) { | |
314 | if (flags & O_EXCL) { | |
315 | if (sdp->open_cnt > 0) { | |
316 | retval = -EBUSY; | |
317 | goto error_mutex_locked; | |
318 | } | |
319 | } else { | |
320 | if (sdp->exclude) { | |
321 | retval = -EBUSY; | |
322 | goto error_mutex_locked; | |
323 | } | |
1da177e4 | 324 | } |
cc833acb DG |
325 | } else { |
326 | retval = open_wait(sdp, flags); | |
327 | if (retval) /* -ERESTARTSYS or -ENODEV */ | |
328 | goto error_mutex_locked; | |
1da177e4 | 329 | } |
cc833acb DG |
330 | |
331 | /* N.B. at this point we are holding the open_rel_lock */ | |
332 | if (flags & O_EXCL) | |
333 | sdp->exclude = true; | |
334 | ||
335 | if (sdp->open_cnt < 1) { /* no existing opens */ | |
1da177e4 | 336 | sdp->sgdebug = 0; |
d6b10348 | 337 | q = sdp->device->request_queue; |
8a78362c | 338 | sdp->sg_tablesize = queue_max_segments(q); |
1da177e4 | 339 | } |
95e159d6 | 340 | sfp = sg_add_sfp(sdp); |
cc833acb DG |
341 | if (IS_ERR(sfp)) { |
342 | retval = PTR_ERR(sfp); | |
343 | goto out_undo; | |
065b4a2f | 344 | } |
cc833acb DG |
345 | |
346 | filp->private_data = sfp; | |
347 | sdp->open_cnt++; | |
348 | mutex_unlock(&sdp->open_rel_lock); | |
349 | ||
065b4a2f | 350 | retval = 0; |
c6517b79 | 351 | sg_put: |
cc833acb | 352 | kref_put(&sdp->d_ref, sg_device_destroy); |
1da177e4 | 353 | return retval; |
cc833acb DG |
354 | |
355 | out_undo: | |
356 | if (flags & O_EXCL) { | |
357 | sdp->exclude = false; /* undo if error */ | |
358 | wake_up_interruptible(&sdp->open_wait); | |
359 | } | |
360 | error_mutex_locked: | |
361 | mutex_unlock(&sdp->open_rel_lock); | |
362 | error_out: | |
363 | scsi_autopm_put_device(sdp->device); | |
364 | sdp_put: | |
365 | scsi_device_put(sdp->device); | |
366 | goto sg_put; | |
1da177e4 LT |
367 | } |
368 | ||
cc833acb DG |
369 | /* Release resources associated with a successful sg_open() |
370 | * Returns 0 on success, else a negated errno value */ | |
1da177e4 LT |
371 | static int |
372 | sg_release(struct inode *inode, struct file *filp) | |
373 | { | |
374 | Sg_device *sdp; | |
375 | Sg_fd *sfp; | |
376 | ||
377 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
378 | return -ENXIO; | |
95e159d6 | 379 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n")); |
c6517b79 | 380 | |
cc833acb | 381 | mutex_lock(&sdp->open_rel_lock); |
bc4f2401 | 382 | scsi_autopm_put_device(sdp->device); |
c6517b79 | 383 | kref_put(&sfp->f_ref, sg_remove_sfp); |
cc833acb DG |
384 | sdp->open_cnt--; |
385 | ||
386 | /* possibly many open()s waiting on exlude clearing, start many; | |
387 | * only open(O_EXCL)s wait on 0==open_cnt so only start one */ | |
388 | if (sdp->exclude) { | |
389 | sdp->exclude = false; | |
390 | wake_up_interruptible_all(&sdp->open_wait); | |
391 | } else if (0 == sdp->open_cnt) { | |
392 | wake_up_interruptible(&sdp->open_wait); | |
393 | } | |
394 | mutex_unlock(&sdp->open_rel_lock); | |
1da177e4 LT |
395 | return 0; |
396 | } | |
397 | ||
398 | static ssize_t | |
399 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
400 | { | |
1da177e4 LT |
401 | Sg_device *sdp; |
402 | Sg_fd *sfp; | |
403 | Sg_request *srp; | |
404 | int req_pack_id = -1; | |
1da177e4 | 405 | sg_io_hdr_t *hp; |
cb59e840 | 406 | struct sg_header *old_hdr = NULL; |
407 | int retval = 0; | |
1da177e4 LT |
408 | |
409 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
410 | return -ENXIO; | |
95e159d6 HR |
411 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
412 | "sg_read: count=%d\n", (int) count)); | |
d6b10348 | 413 | |
1da177e4 LT |
414 | if (!access_ok(VERIFY_WRITE, buf, count)) |
415 | return -EFAULT; | |
416 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { | |
cb59e840 | 417 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
418 | if (!old_hdr) | |
419 | return -ENOMEM; | |
420 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { | |
421 | retval = -EFAULT; | |
422 | goto free_old_hdr; | |
423 | } | |
424 | if (old_hdr->reply_len < 0) { | |
1da177e4 | 425 | if (count >= SZ_SG_IO_HDR) { |
cb59e840 | 426 | sg_io_hdr_t *new_hdr; |
427 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); | |
428 | if (!new_hdr) { | |
429 | retval = -ENOMEM; | |
430 | goto free_old_hdr; | |
431 | } | |
432 | retval =__copy_from_user | |
433 | (new_hdr, buf, SZ_SG_IO_HDR); | |
434 | req_pack_id = new_hdr->pack_id; | |
435 | kfree(new_hdr); | |
436 | if (retval) { | |
437 | retval = -EFAULT; | |
438 | goto free_old_hdr; | |
439 | } | |
1da177e4 LT |
440 | } |
441 | } else | |
cb59e840 | 442 | req_pack_id = old_hdr->pack_id; |
1da177e4 LT |
443 | } |
444 | srp = sg_get_rq_mark(sfp, req_pack_id); | |
445 | if (!srp) { /* now wait on packet to arrive */ | |
cc833acb | 446 | if (atomic_read(&sdp->detaching)) { |
cb59e840 | 447 | retval = -ENODEV; |
448 | goto free_old_hdr; | |
449 | } | |
450 | if (filp->f_flags & O_NONBLOCK) { | |
451 | retval = -EAGAIN; | |
452 | goto free_old_hdr; | |
453 | } | |
3f0c6aba | 454 | retval = wait_event_interruptible(sfp->read_wait, |
cc833acb | 455 | (atomic_read(&sdp->detaching) || |
3f0c6aba | 456 | (srp = sg_get_rq_mark(sfp, req_pack_id)))); |
cc833acb | 457 | if (atomic_read(&sdp->detaching)) { |
794c10fa JE |
458 | retval = -ENODEV; |
459 | goto free_old_hdr; | |
460 | } | |
461 | if (retval) { | |
cb59e840 | 462 | /* -ERESTARTSYS as signal hit process */ |
463 | goto free_old_hdr; | |
1da177e4 LT |
464 | } |
465 | } | |
cb59e840 | 466 | if (srp->header.interface_id != '\0') { |
467 | retval = sg_new_read(sfp, buf, count, srp); | |
468 | goto free_old_hdr; | |
469 | } | |
1da177e4 LT |
470 | |
471 | hp = &srp->header; | |
cb59e840 | 472 | if (old_hdr == NULL) { |
473 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
474 | if (! old_hdr) { | |
475 | retval = -ENOMEM; | |
476 | goto free_old_hdr; | |
477 | } | |
478 | } | |
479 | memset(old_hdr, 0, SZ_SG_HEADER); | |
480 | old_hdr->reply_len = (int) hp->timeout; | |
481 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
482 | old_hdr->pack_id = hp->pack_id; | |
483 | old_hdr->twelve_byte = | |
1da177e4 | 484 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 | 485 | old_hdr->target_status = hp->masked_status; |
486 | old_hdr->host_status = hp->host_status; | |
487 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 LT |
488 | if ((CHECK_CONDITION & hp->masked_status) || |
489 | (DRIVER_SENSE & hp->driver_status)) | |
cb59e840 | 490 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
491 | sizeof (old_hdr->sense_buffer)); | |
1da177e4 LT |
492 | switch (hp->host_status) { |
493 | /* This setup of 'result' is for backward compatibility and is best | |
494 | ignored by the user who should use target, host + driver status */ | |
495 | case DID_OK: | |
496 | case DID_PASSTHROUGH: | |
497 | case DID_SOFT_ERROR: | |
cb59e840 | 498 | old_hdr->result = 0; |
1da177e4 LT |
499 | break; |
500 | case DID_NO_CONNECT: | |
501 | case DID_BUS_BUSY: | |
502 | case DID_TIME_OUT: | |
cb59e840 | 503 | old_hdr->result = EBUSY; |
1da177e4 LT |
504 | break; |
505 | case DID_BAD_TARGET: | |
506 | case DID_ABORT: | |
507 | case DID_PARITY: | |
508 | case DID_RESET: | |
509 | case DID_BAD_INTR: | |
cb59e840 | 510 | old_hdr->result = EIO; |
1da177e4 LT |
511 | break; |
512 | case DID_ERROR: | |
cb59e840 | 513 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
514 | hp->masked_status == GOOD) ? 0 : EIO; |
515 | break; | |
516 | default: | |
cb59e840 | 517 | old_hdr->result = EIO; |
1da177e4 LT |
518 | break; |
519 | } | |
520 | ||
521 | /* Now copy the result back to the user buffer. */ | |
522 | if (count >= SZ_SG_HEADER) { | |
cb59e840 | 523 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
524 | retval = -EFAULT; | |
525 | goto free_old_hdr; | |
526 | } | |
1da177e4 | 527 | buf += SZ_SG_HEADER; |
cb59e840 | 528 | if (count > old_hdr->reply_len) |
529 | count = old_hdr->reply_len; | |
1da177e4 | 530 | if (count > SZ_SG_HEADER) { |
cb59e840 | 531 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
532 | retval = -EFAULT; | |
533 | goto free_old_hdr; | |
534 | } | |
1da177e4 LT |
535 | } |
536 | } else | |
cb59e840 | 537 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 538 | sg_finish_rem_req(srp); |
cb59e840 | 539 | retval = count; |
540 | free_old_hdr: | |
c9475cb0 | 541 | kfree(old_hdr); |
cb59e840 | 542 | return retval; |
1da177e4 LT |
543 | } |
544 | ||
545 | static ssize_t | |
546 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
547 | { | |
548 | sg_io_hdr_t *hp = &srp->header; | |
3b524a68 | 549 | int err = 0, err2; |
1da177e4 LT |
550 | int len; |
551 | ||
552 | if (count < SZ_SG_IO_HDR) { | |
553 | err = -EINVAL; | |
554 | goto err_out; | |
555 | } | |
556 | hp->sb_len_wr = 0; | |
557 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
558 | if ((CHECK_CONDITION & hp->masked_status) || | |
559 | (DRIVER_SENSE & hp->driver_status)) { | |
d6b10348 | 560 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
1da177e4 LT |
561 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
562 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
563 | len = (len > sb_len) ? sb_len : len; | |
564 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
565 | err = -EFAULT; | |
566 | goto err_out; | |
567 | } | |
568 | hp->sb_len_wr = len; | |
569 | } | |
570 | } | |
571 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
572 | hp->info |= SG_INFO_CHECK; | |
573 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { | |
574 | err = -EFAULT; | |
575 | goto err_out; | |
576 | } | |
0b6cb26c | 577 | err_out: |
3b524a68 TB |
578 | err2 = sg_finish_rem_req(srp); |
579 | return err ? : err2 ? : count; | |
1da177e4 LT |
580 | } |
581 | ||
582 | static ssize_t | |
583 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
584 | { | |
585 | int mxsize, cmd_size, k; | |
586 | int input_size, blocking; | |
587 | unsigned char opcode; | |
588 | Sg_device *sdp; | |
589 | Sg_fd *sfp; | |
590 | Sg_request *srp; | |
591 | struct sg_header old_hdr; | |
592 | sg_io_hdr_t *hp; | |
65c26a0f | 593 | unsigned char cmnd[SG_MAX_CDB_SIZE]; |
1da177e4 LT |
594 | |
595 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
596 | return -ENXIO; | |
95e159d6 HR |
597 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
598 | "sg_write: count=%d\n", (int) count)); | |
cc833acb | 599 | if (atomic_read(&sdp->detaching)) |
1da177e4 LT |
600 | return -ENODEV; |
601 | if (!((filp->f_flags & O_NONBLOCK) || | |
602 | scsi_block_when_processing_errors(sdp->device))) | |
603 | return -ENXIO; | |
604 | ||
605 | if (!access_ok(VERIFY_READ, buf, count)) | |
606 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
607 | if (count < SZ_SG_HEADER) | |
608 | return -EIO; | |
609 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) | |
610 | return -EFAULT; | |
611 | blocking = !(filp->f_flags & O_NONBLOCK); | |
612 | if (old_hdr.reply_len < 0) | |
a2dd3b4c TB |
613 | return sg_new_write(sfp, filp, buf, count, |
614 | blocking, 0, 0, NULL); | |
1da177e4 LT |
615 | if (count < (SZ_SG_HEADER + 6)) |
616 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
617 | ||
618 | if (!(srp = sg_add_request(sfp))) { | |
95e159d6 HR |
619 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp, |
620 | "sg_write: queue full\n")); | |
1da177e4 LT |
621 | return -EDOM; |
622 | } | |
623 | buf += SZ_SG_HEADER; | |
624 | __get_user(opcode, buf); | |
625 | if (sfp->next_cmd_len > 0) { | |
1da177e4 LT |
626 | cmd_size = sfp->next_cmd_len; |
627 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
628 | } else { | |
629 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
630 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
631 | cmd_size = 12; | |
632 | } | |
95e159d6 | 633 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
1da177e4 LT |
634 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); |
635 | /* Determine buffer size. */ | |
636 | input_size = count - cmd_size; | |
637 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
638 | mxsize -= SZ_SG_HEADER; | |
639 | input_size -= SZ_SG_HEADER; | |
640 | if (input_size < 0) { | |
641 | sg_remove_request(sfp, srp); | |
642 | return -EIO; /* User did not pass enough bytes for this command. */ | |
643 | } | |
644 | hp = &srp->header; | |
645 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
646 | hp->cmd_len = (unsigned char) cmd_size; | |
647 | hp->iovec_count = 0; | |
648 | hp->mx_sb_len = 0; | |
649 | if (input_size > 0) | |
650 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
651 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
652 | else | |
653 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
654 | hp->dxfer_len = mxsize; | |
5ecee0a3 DG |
655 | if ((hp->dxfer_direction == SG_DXFER_TO_DEV) || |
656 | (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)) | |
fad7f01e FT |
657 | hp->dxferp = (char __user *)buf + cmd_size; |
658 | else | |
659 | hp->dxferp = NULL; | |
1da177e4 LT |
660 | hp->sbp = NULL; |
661 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
662 | hp->flags = input_size; /* structure abuse ... */ | |
663 | hp->pack_id = old_hdr.pack_id; | |
664 | hp->usr_ptr = NULL; | |
665 | if (__copy_from_user(cmnd, buf, cmd_size)) | |
666 | return -EFAULT; | |
667 | /* | |
668 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
669 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
670 | * is a non-zero input_size, so emit a warning. | |
671 | */ | |
eaa3e22e AK |
672 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
673 | static char cmd[TASK_COMM_LEN]; | |
2fe038e3 CD |
674 | if (strcmp(current->comm, cmd)) { |
675 | printk_ratelimited(KERN_WARNING | |
676 | "sg_write: data in/out %d/%d bytes " | |
677 | "for SCSI command 0x%x-- guessing " | |
678 | "data in;\n program %s not setting " | |
679 | "count and/or reply_len properly\n", | |
680 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
681 | input_size, (unsigned int) cmnd[0], | |
682 | current->comm); | |
eaa3e22e AK |
683 | strcpy(cmd, current->comm); |
684 | } | |
685 | } | |
1da177e4 LT |
686 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
687 | return (k < 0) ? k : count; | |
688 | } | |
689 | ||
690 | static ssize_t | |
0b07de85 | 691 | sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, |
a2dd3b4c | 692 | size_t count, int blocking, int read_only, int sg_io_owned, |
0b07de85 | 693 | Sg_request **o_srp) |
1da177e4 LT |
694 | { |
695 | int k; | |
696 | Sg_request *srp; | |
697 | sg_io_hdr_t *hp; | |
65c26a0f | 698 | unsigned char cmnd[SG_MAX_CDB_SIZE]; |
1da177e4 LT |
699 | int timeout; |
700 | unsigned long ul_timeout; | |
701 | ||
702 | if (count < SZ_SG_IO_HDR) | |
703 | return -EINVAL; | |
704 | if (!access_ok(VERIFY_READ, buf, count)) | |
705 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
706 | ||
707 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
708 | if (!(srp = sg_add_request(sfp))) { | |
95e159d6 HR |
709 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
710 | "sg_new_write: queue full\n")); | |
1da177e4 LT |
711 | return -EDOM; |
712 | } | |
a2dd3b4c | 713 | srp->sg_io_owned = sg_io_owned; |
1da177e4 LT |
714 | hp = &srp->header; |
715 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { | |
716 | sg_remove_request(sfp, srp); | |
717 | return -EFAULT; | |
718 | } | |
719 | if (hp->interface_id != 'S') { | |
720 | sg_remove_request(sfp, srp); | |
721 | return -ENOSYS; | |
722 | } | |
723 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
724 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
725 | sg_remove_request(sfp, srp); | |
726 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
727 | } | |
728 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
729 | sg_remove_request(sfp, srp); | |
730 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
731 | } | |
732 | if (sg_res_in_use(sfp)) { | |
733 | sg_remove_request(sfp, srp); | |
734 | return -EBUSY; /* reserve buffer already being used */ | |
735 | } | |
736 | } | |
737 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
738 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
739 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
740 | sg_remove_request(sfp, srp); | |
741 | return -EMSGSIZE; | |
742 | } | |
743 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { | |
744 | sg_remove_request(sfp, srp); | |
745 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
746 | } | |
747 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { | |
748 | sg_remove_request(sfp, srp); | |
749 | return -EFAULT; | |
750 | } | |
14e507b8 | 751 | if (read_only && sg_allow_access(file, cmnd)) { |
1da177e4 LT |
752 | sg_remove_request(sfp, srp); |
753 | return -EPERM; | |
754 | } | |
755 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
756 | if (k < 0) | |
757 | return k; | |
758 | if (o_srp) | |
759 | *o_srp = srp; | |
760 | return count; | |
761 | } | |
762 | ||
763 | static int | |
764 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
765 | unsigned char *cmnd, int timeout, int blocking) | |
766 | { | |
5af2e382 | 767 | int k, at_head; |
1da177e4 LT |
768 | Sg_device *sdp = sfp->parentdp; |
769 | sg_io_hdr_t *hp = &srp->header; | |
1da177e4 LT |
770 | |
771 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
772 | hp->status = 0; | |
773 | hp->masked_status = 0; | |
774 | hp->msg_status = 0; | |
775 | hp->info = 0; | |
776 | hp->host_status = 0; | |
777 | hp->driver_status = 0; | |
778 | hp->resid = 0; | |
95e159d6 HR |
779 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
780 | "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
781 | (int) cmnd[0], (int) hp->cmd_len)); | |
1da177e4 | 782 | |
10865dfa FT |
783 | k = sg_start_req(srp, cmnd); |
784 | if (k) { | |
95e159d6 HR |
785 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
786 | "sg_common_write: start_req err=%d\n", k)); | |
1da177e4 LT |
787 | sg_finish_rem_req(srp); |
788 | return k; /* probably out of space --> ENOMEM */ | |
789 | } | |
cc833acb | 790 | if (atomic_read(&sdp->detaching)) { |
f3951a37 CO |
791 | if (srp->bio) { |
792 | if (srp->rq->cmd != srp->rq->__cmd) | |
793 | kfree(srp->rq->cmd); | |
794 | ||
caf19d38 | 795 | blk_end_request_all(srp->rq, -EIO); |
f3951a37 CO |
796 | srp->rq = NULL; |
797 | } | |
798 | ||
1da177e4 LT |
799 | sg_finish_rem_req(srp); |
800 | return -ENODEV; | |
801 | } | |
1da177e4 | 802 | |
cb59e840 | 803 | hp->duration = jiffies_to_msecs(jiffies); |
16070cc1 DG |
804 | if (hp->interface_id != '\0' && /* v3 (or later) interface */ |
805 | (SG_FLAG_Q_AT_TAIL & hp->flags)) | |
806 | at_head = 0; | |
807 | else | |
808 | at_head = 1; | |
10db10d1 FT |
809 | |
810 | srp->rq->timeout = timeout; | |
c6517b79 | 811 | kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ |
10db10d1 | 812 | blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, |
16070cc1 | 813 | srp->rq, at_head, sg_rq_end_io); |
10db10d1 | 814 | return 0; |
1da177e4 LT |
815 | } |
816 | ||
6acddc5e JE |
817 | static int srp_done(Sg_fd *sfp, Sg_request *srp) |
818 | { | |
819 | unsigned long flags; | |
820 | int ret; | |
821 | ||
822 | read_lock_irqsave(&sfp->rq_list_lock, flags); | |
823 | ret = srp->done; | |
824 | read_unlock_irqrestore(&sfp->rq_list_lock, flags); | |
825 | return ret; | |
826 | } | |
827 | ||
46f69e6a AM |
828 | static int max_sectors_bytes(struct request_queue *q) |
829 | { | |
830 | unsigned int max_sectors = queue_max_sectors(q); | |
831 | ||
832 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); | |
833 | ||
834 | return max_sectors << 9; | |
835 | } | |
836 | ||
37b9d1e0 | 837 | static long |
f4927c45 | 838 | sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) |
1da177e4 LT |
839 | { |
840 | void __user *p = (void __user *)arg; | |
841 | int __user *ip = p; | |
176aa9d6 | 842 | int result, val, read_only; |
1da177e4 LT |
843 | Sg_device *sdp; |
844 | Sg_fd *sfp; | |
845 | Sg_request *srp; | |
846 | unsigned long iflags; | |
847 | ||
848 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
849 | return -ENXIO; | |
abf54393 | 850 | |
95e159d6 HR |
851 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
852 | "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); | |
1da177e4 LT |
853 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); |
854 | ||
855 | switch (cmd_in) { | |
856 | case SG_IO: | |
cc833acb | 857 | if (atomic_read(&sdp->detaching)) |
dddbf8d9 JE |
858 | return -ENODEV; |
859 | if (!scsi_block_when_processing_errors(sdp->device)) | |
860 | return -ENXIO; | |
861 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) | |
862 | return -EFAULT; | |
863 | result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, | |
864 | 1, read_only, 1, &srp); | |
865 | if (result < 0) | |
866 | return result; | |
3f0c6aba | 867 | result = wait_event_interruptible(sfp->read_wait, |
cc833acb DG |
868 | (srp_done(sfp, srp) || atomic_read(&sdp->detaching))); |
869 | if (atomic_read(&sdp->detaching)) | |
794c10fa JE |
870 | return -ENODEV; |
871 | write_lock_irq(&sfp->rq_list_lock); | |
872 | if (srp->done) { | |
873 | srp->done = 2; | |
dddbf8d9 | 874 | write_unlock_irq(&sfp->rq_list_lock); |
794c10fa JE |
875 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); |
876 | return (result < 0) ? result : 0; | |
1da177e4 | 877 | } |
794c10fa JE |
878 | srp->orphan = 1; |
879 | write_unlock_irq(&sfp->rq_list_lock); | |
880 | return result; /* -ERESTARTSYS because signal hit process */ | |
1da177e4 LT |
881 | case SG_SET_TIMEOUT: |
882 | result = get_user(val, ip); | |
883 | if (result) | |
884 | return result; | |
885 | if (val < 0) | |
886 | return -EIO; | |
887 | if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) | |
888 | val = MULDIV (INT_MAX, USER_HZ, HZ); | |
889 | sfp->timeout_user = val; | |
890 | sfp->timeout = MULDIV (val, HZ, USER_HZ); | |
891 | ||
892 | return 0; | |
893 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
894 | /* strange ..., for backward compatibility */ | |
895 | return sfp->timeout_user; | |
896 | case SG_SET_FORCE_LOW_DMA: | |
897 | result = get_user(val, ip); | |
898 | if (result) | |
899 | return result; | |
900 | if (val) { | |
901 | sfp->low_dma = 1; | |
902 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { | |
903 | val = (int) sfp->reserve.bufflen; | |
95e159d6 | 904 | sg_remove_scat(sfp, &sfp->reserve); |
1da177e4 LT |
905 | sg_build_reserve(sfp, val); |
906 | } | |
907 | } else { | |
cc833acb | 908 | if (atomic_read(&sdp->detaching)) |
1da177e4 LT |
909 | return -ENODEV; |
910 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; | |
911 | } | |
912 | return 0; | |
913 | case SG_GET_LOW_DMA: | |
914 | return put_user((int) sfp->low_dma, ip); | |
915 | case SG_GET_SCSI_ID: | |
916 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) | |
917 | return -EFAULT; | |
918 | else { | |
919 | sg_scsi_id_t __user *sg_idp = p; | |
920 | ||
cc833acb | 921 | if (atomic_read(&sdp->detaching)) |
1da177e4 LT |
922 | return -ENODEV; |
923 | __put_user((int) sdp->device->host->host_no, | |
924 | &sg_idp->host_no); | |
925 | __put_user((int) sdp->device->channel, | |
926 | &sg_idp->channel); | |
927 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); | |
928 | __put_user((int) sdp->device->lun, &sg_idp->lun); | |
929 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); | |
930 | __put_user((short) sdp->device->host->cmd_per_lun, | |
931 | &sg_idp->h_cmd_per_lun); | |
932 | __put_user((short) sdp->device->queue_depth, | |
933 | &sg_idp->d_queue_depth); | |
934 | __put_user(0, &sg_idp->unused[0]); | |
935 | __put_user(0, &sg_idp->unused[1]); | |
936 | return 0; | |
937 | } | |
938 | case SG_SET_FORCE_PACK_ID: | |
939 | result = get_user(val, ip); | |
940 | if (result) | |
941 | return result; | |
942 | sfp->force_packid = val ? 1 : 0; | |
943 | return 0; | |
944 | case SG_GET_PACK_ID: | |
945 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) | |
946 | return -EFAULT; | |
947 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
948 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
949 | if ((1 == srp->done) && (!srp->sg_io_owned)) { | |
950 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
951 | iflags); | |
952 | __put_user(srp->header.pack_id, ip); | |
953 | return 0; | |
954 | } | |
955 | } | |
956 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
957 | __put_user(-1, ip); | |
958 | return 0; | |
959 | case SG_GET_NUM_WAITING: | |
960 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
961 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { | |
962 | if ((1 == srp->done) && (!srp->sg_io_owned)) | |
963 | ++val; | |
964 | } | |
965 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
966 | return put_user(val, ip); | |
967 | case SG_GET_SG_TABLESIZE: | |
968 | return put_user(sdp->sg_tablesize, ip); | |
969 | case SG_SET_RESERVED_SIZE: | |
970 | result = get_user(val, ip); | |
971 | if (result) | |
972 | return result; | |
973 | if (val < 0) | |
974 | return -EINVAL; | |
44ec9542 | 975 | val = min_t(int, val, |
46f69e6a | 976 | max_sectors_bytes(sdp->device->request_queue)); |
1da177e4 LT |
977 | if (val != sfp->reserve.bufflen) { |
978 | if (sg_res_in_use(sfp) || sfp->mmap_called) | |
979 | return -EBUSY; | |
95e159d6 | 980 | sg_remove_scat(sfp, &sfp->reserve); |
1da177e4 LT |
981 | sg_build_reserve(sfp, val); |
982 | } | |
983 | return 0; | |
984 | case SG_GET_RESERVED_SIZE: | |
44ec9542 | 985 | val = min_t(int, sfp->reserve.bufflen, |
46f69e6a | 986 | max_sectors_bytes(sdp->device->request_queue)); |
1da177e4 LT |
987 | return put_user(val, ip); |
988 | case SG_SET_COMMAND_Q: | |
989 | result = get_user(val, ip); | |
990 | if (result) | |
991 | return result; | |
992 | sfp->cmd_q = val ? 1 : 0; | |
993 | return 0; | |
994 | case SG_GET_COMMAND_Q: | |
995 | return put_user((int) sfp->cmd_q, ip); | |
996 | case SG_SET_KEEP_ORPHAN: | |
997 | result = get_user(val, ip); | |
998 | if (result) | |
999 | return result; | |
1000 | sfp->keep_orphan = val; | |
1001 | return 0; | |
1002 | case SG_GET_KEEP_ORPHAN: | |
1003 | return put_user((int) sfp->keep_orphan, ip); | |
1004 | case SG_NEXT_CMD_LEN: | |
1005 | result = get_user(val, ip); | |
1006 | if (result) | |
1007 | return result; | |
1008 | sfp->next_cmd_len = (val > 0) ? val : 0; | |
1009 | return 0; | |
1010 | case SG_GET_VERSION_NUM: | |
1011 | return put_user(sg_version_num, ip); | |
1012 | case SG_GET_ACCESS_COUNT: | |
1013 | /* faked - we don't have a real access count anymore */ | |
1014 | val = (sdp->device ? 1 : 0); | |
1015 | return put_user(val, ip); | |
1016 | case SG_GET_REQUEST_TABLE: | |
1017 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) | |
1018 | return -EFAULT; | |
1019 | else { | |
cb59e840 | 1020 | sg_req_info_t *rinfo; |
1021 | unsigned int ms; | |
1022 | ||
1023 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, | |
1024 | GFP_KERNEL); | |
1025 | if (!rinfo) | |
1026 | return -ENOMEM; | |
1da177e4 LT |
1027 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
1028 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; | |
1029 | ++val, srp = srp ? srp->nextrp : srp) { | |
1030 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); | |
1031 | if (srp) { | |
1032 | rinfo[val].req_state = srp->done + 1; | |
1033 | rinfo[val].problem = | |
1034 | srp->header.masked_status & | |
1035 | srp->header.host_status & | |
1036 | srp->header.driver_status; | |
cb59e840 | 1037 | if (srp->done) |
1038 | rinfo[val].duration = | |
1039 | srp->header.duration; | |
1040 | else { | |
1041 | ms = jiffies_to_msecs(jiffies); | |
1042 | rinfo[val].duration = | |
1043 | (ms > srp->header.duration) ? | |
1044 | (ms - srp->header.duration) : 0; | |
1045 | } | |
1da177e4 | 1046 | rinfo[val].orphan = srp->orphan; |
cb59e840 | 1047 | rinfo[val].sg_io_owned = |
1048 | srp->sg_io_owned; | |
1049 | rinfo[val].pack_id = | |
1050 | srp->header.pack_id; | |
1051 | rinfo[val].usr_ptr = | |
1052 | srp->header.usr_ptr; | |
1da177e4 LT |
1053 | } |
1054 | } | |
1055 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
cb59e840 | 1056 | result = __copy_to_user(p, rinfo, |
1057 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
1058 | result = result ? -EFAULT : 0; | |
1059 | kfree(rinfo); | |
1060 | return result; | |
1da177e4 LT |
1061 | } |
1062 | case SG_EMULATED_HOST: | |
cc833acb | 1063 | if (atomic_read(&sdp->detaching)) |
1da177e4 LT |
1064 | return -ENODEV; |
1065 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1da177e4 | 1066 | case SCSI_IOCTL_SEND_COMMAND: |
cc833acb | 1067 | if (atomic_read(&sdp->detaching)) |
1da177e4 LT |
1068 | return -ENODEV; |
1069 | if (read_only) { | |
1070 | unsigned char opcode = WRITE_6; | |
1071 | Scsi_Ioctl_Command __user *siocp = p; | |
1072 | ||
1073 | if (copy_from_user(&opcode, siocp->data, 1)) | |
1074 | return -EFAULT; | |
14e507b8 | 1075 | if (sg_allow_access(filp, &opcode)) |
1da177e4 LT |
1076 | return -EPERM; |
1077 | } | |
e915e872 | 1078 | return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); |
1da177e4 LT |
1079 | case SG_SET_DEBUG: |
1080 | result = get_user(val, ip); | |
1081 | if (result) | |
1082 | return result; | |
1083 | sdp->sgdebug = (char) val; | |
1084 | return 0; | |
44ec9542 | 1085 | case BLKSECTGET: |
46f69e6a | 1086 | return put_user(max_sectors_bytes(sdp->device->request_queue), |
44ec9542 | 1087 | ip); |
6da127ad CS |
1088 | case BLKTRACESETUP: |
1089 | return blk_trace_setup(sdp->device->request_queue, | |
1090 | sdp->disk->disk_name, | |
76e3a19d | 1091 | MKDEV(SCSI_GENERIC_MAJOR, sdp->index), |
d0deef5b | 1092 | NULL, |
6da127ad CS |
1093 | (char *)arg); |
1094 | case BLKTRACESTART: | |
1095 | return blk_trace_startstop(sdp->device->request_queue, 1); | |
1096 | case BLKTRACESTOP: | |
1097 | return blk_trace_startstop(sdp->device->request_queue, 0); | |
1098 | case BLKTRACETEARDOWN: | |
1099 | return blk_trace_remove(sdp->device->request_queue); | |
906d15fb CH |
1100 | case SCSI_IOCTL_GET_IDLUN: |
1101 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1102 | case SCSI_IOCTL_PROBE_HOST: | |
1103 | case SG_GET_TRANSFORM: | |
1104 | case SG_SCSI_RESET: | |
1105 | if (atomic_read(&sdp->detaching)) | |
1106 | return -ENODEV; | |
1107 | break; | |
1da177e4 LT |
1108 | default: |
1109 | if (read_only) | |
1110 | return -EPERM; /* don't know so take safe approach */ | |
906d15fb | 1111 | break; |
1da177e4 | 1112 | } |
906d15fb CH |
1113 | |
1114 | result = scsi_ioctl_block_when_processing_errors(sdp->device, | |
1115 | cmd_in, filp->f_flags & O_NDELAY); | |
1116 | if (result) | |
1117 | return result; | |
1118 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1da177e4 LT |
1119 | } |
1120 | ||
1121 | #ifdef CONFIG_COMPAT | |
1122 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1123 | { | |
1124 | Sg_device *sdp; | |
1125 | Sg_fd *sfp; | |
1126 | struct scsi_device *sdev; | |
1127 | ||
1128 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1129 | return -ENXIO; | |
1130 | ||
1131 | sdev = sdp->device; | |
1132 | if (sdev->host->hostt->compat_ioctl) { | |
1133 | int ret; | |
1134 | ||
1135 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); | |
1136 | ||
1137 | return ret; | |
1138 | } | |
1139 | ||
1140 | return -ENOIOCTLCMD; | |
1141 | } | |
1142 | #endif | |
1143 | ||
1144 | static unsigned int | |
1145 | sg_poll(struct file *filp, poll_table * wait) | |
1146 | { | |
1147 | unsigned int res = 0; | |
1148 | Sg_device *sdp; | |
1149 | Sg_fd *sfp; | |
1150 | Sg_request *srp; | |
1151 | int count = 0; | |
1152 | unsigned long iflags; | |
1153 | ||
ebaf466b JE |
1154 | sfp = filp->private_data; |
1155 | if (!sfp) | |
1156 | return POLLERR; | |
1157 | sdp = sfp->parentdp; | |
1158 | if (!sdp) | |
1da177e4 LT |
1159 | return POLLERR; |
1160 | poll_wait(filp, &sfp->read_wait, wait); | |
1161 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1162 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
1163 | /* if any read waiting, flag it */ | |
1164 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
1165 | res = POLLIN | POLLRDNORM; | |
1166 | ++count; | |
1167 | } | |
1168 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1169 | ||
cc833acb | 1170 | if (atomic_read(&sdp->detaching)) |
1da177e4 LT |
1171 | res |= POLLHUP; |
1172 | else if (!sfp->cmd_q) { | |
1173 | if (0 == count) | |
1174 | res |= POLLOUT | POLLWRNORM; | |
1175 | } else if (count < SG_MAX_QUEUE) | |
1176 | res |= POLLOUT | POLLWRNORM; | |
95e159d6 HR |
1177 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
1178 | "sg_poll: res=0x%x\n", (int) res)); | |
1da177e4 LT |
1179 | return res; |
1180 | } | |
1181 | ||
1182 | static int | |
1183 | sg_fasync(int fd, struct file *filp, int mode) | |
1184 | { | |
1da177e4 LT |
1185 | Sg_device *sdp; |
1186 | Sg_fd *sfp; | |
1187 | ||
1188 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1189 | return -ENXIO; | |
95e159d6 HR |
1190 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
1191 | "sg_fasync: mode=%d\n", mode)); | |
1da177e4 | 1192 | |
60aa4924 | 1193 | return fasync_helper(fd, filp, mode, &sfp->async_qp); |
1da177e4 LT |
1194 | } |
1195 | ||
a13ff0bb NP |
1196 | static int |
1197 | sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1da177e4 LT |
1198 | { |
1199 | Sg_fd *sfp; | |
d6b10348 | 1200 | unsigned long offset, len, sa; |
1da177e4 | 1201 | Sg_scatter_hold *rsv_schp; |
10db10d1 | 1202 | int k, length; |
1da177e4 LT |
1203 | |
1204 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
a13ff0bb | 1205 | return VM_FAULT_SIGBUS; |
1da177e4 | 1206 | rsv_schp = &sfp->reserve; |
a13ff0bb | 1207 | offset = vmf->pgoff << PAGE_SHIFT; |
1da177e4 | 1208 | if (offset >= rsv_schp->bufflen) |
a13ff0bb | 1209 | return VM_FAULT_SIGBUS; |
95e159d6 HR |
1210 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
1211 | "sg_vma_fault: offset=%lu, scatg=%d\n", | |
1212 | offset, rsv_schp->k_use_sg)); | |
d6b10348 | 1213 | sa = vma->vm_start; |
10db10d1 FT |
1214 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1215 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
d6b10348 | 1216 | len = vma->vm_end - sa; |
10db10d1 | 1217 | len = (len < length) ? len : length; |
d6b10348 | 1218 | if (offset < len) { |
10db10d1 FT |
1219 | struct page *page = nth_page(rsv_schp->pages[k], |
1220 | offset >> PAGE_SHIFT); | |
d6b10348 | 1221 | get_page(page); /* increment page count */ |
a13ff0bb NP |
1222 | vmf->page = page; |
1223 | return 0; /* success */ | |
1da177e4 | 1224 | } |
d6b10348 MC |
1225 | sa += len; |
1226 | offset -= len; | |
1da177e4 | 1227 | } |
d6b10348 | 1228 | |
a13ff0bb | 1229 | return VM_FAULT_SIGBUS; |
1da177e4 LT |
1230 | } |
1231 | ||
f0f37e2f | 1232 | static const struct vm_operations_struct sg_mmap_vm_ops = { |
a13ff0bb | 1233 | .fault = sg_vma_fault, |
1da177e4 LT |
1234 | }; |
1235 | ||
1236 | static int | |
1237 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1238 | { | |
1239 | Sg_fd *sfp; | |
d6b10348 | 1240 | unsigned long req_sz, len, sa; |
1da177e4 | 1241 | Sg_scatter_hold *rsv_schp; |
10db10d1 | 1242 | int k, length; |
1da177e4 LT |
1243 | |
1244 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1245 | return -ENXIO; | |
cb59e840 | 1246 | req_sz = vma->vm_end - vma->vm_start; |
95e159d6 HR |
1247 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
1248 | "sg_mmap starting, vm_start=%p, len=%d\n", | |
1249 | (void *) vma->vm_start, (int) req_sz)); | |
1da177e4 LT |
1250 | if (vma->vm_pgoff) |
1251 | return -EINVAL; /* want no offset */ | |
1252 | rsv_schp = &sfp->reserve; | |
1253 | if (req_sz > rsv_schp->bufflen) | |
1254 | return -ENOMEM; /* cannot map more than reserved buffer */ | |
1255 | ||
d6b10348 | 1256 | sa = vma->vm_start; |
10db10d1 FT |
1257 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1258 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
d6b10348 | 1259 | len = vma->vm_end - sa; |
10db10d1 | 1260 | len = (len < length) ? len : length; |
d6b10348 | 1261 | sa += len; |
1da177e4 | 1262 | } |
d6b10348 | 1263 | |
f9aed0e2 | 1264 | sfp->mmap_called = 1; |
461c7fa1 | 1265 | vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; |
1da177e4 LT |
1266 | vma->vm_private_data = sfp; |
1267 | vma->vm_ops = &sg_mmap_vm_ops; | |
1268 | return 0; | |
1269 | } | |
1270 | ||
cc833acb DG |
1271 | static void |
1272 | sg_rq_end_io_usercontext(struct work_struct *work) | |
c96952ed FT |
1273 | { |
1274 | struct sg_request *srp = container_of(work, struct sg_request, ew.work); | |
1275 | struct sg_fd *sfp = srp->parentfp; | |
1276 | ||
1277 | sg_finish_rem_req(srp); | |
1278 | kref_put(&sfp->f_ref, sg_remove_sfp); | |
1279 | } | |
1280 | ||
a91a3a20 FT |
1281 | /* |
1282 | * This function is a "bottom half" handler that is called by the mid | |
1283 | * level when a command is completed (or has failed). | |
1284 | */ | |
cc833acb DG |
1285 | static void |
1286 | sg_rq_end_io(struct request *rq, int uptodate) | |
1da177e4 | 1287 | { |
a91a3a20 | 1288 | struct sg_request *srp = rq->end_io_data; |
c6517b79 | 1289 | Sg_device *sdp; |
1da177e4 | 1290 | Sg_fd *sfp; |
1da177e4 | 1291 | unsigned long iflags; |
cb59e840 | 1292 | unsigned int ms; |
a91a3a20 | 1293 | char *sense; |
c6517b79 | 1294 | int result, resid, done = 1; |
1da177e4 | 1295 | |
c6517b79 | 1296 | if (WARN_ON(srp->done != 0)) |
1da177e4 | 1297 | return; |
c6517b79 | 1298 | |
1da177e4 | 1299 | sfp = srp->parentfp; |
c6517b79 | 1300 | if (WARN_ON(sfp == NULL)) |
1da177e4 | 1301 | return; |
c6517b79 TB |
1302 | |
1303 | sdp = sfp->parentdp; | |
cc833acb DG |
1304 | if (unlikely(atomic_read(&sdp->detaching))) |
1305 | pr_info("%s: device detaching\n", __func__); | |
1da177e4 | 1306 | |
a91a3a20 FT |
1307 | sense = rq->sense; |
1308 | result = rq->errors; | |
c3a4d78c | 1309 | resid = rq->resid_len; |
1da177e4 | 1310 | |
95e159d6 HR |
1311 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
1312 | "sg_cmd_done: pack_id=%d, res=0x%x\n", | |
1313 | srp->header.pack_id, result)); | |
d6b10348 | 1314 | srp->header.resid = resid; |
cb59e840 | 1315 | ms = jiffies_to_msecs(jiffies); |
1316 | srp->header.duration = (ms > srp->header.duration) ? | |
1317 | (ms - srp->header.duration) : 0; | |
d6b10348 | 1318 | if (0 != result) { |
1da177e4 LT |
1319 | struct scsi_sense_hdr sshdr; |
1320 | ||
d6b10348 MC |
1321 | srp->header.status = 0xff & result; |
1322 | srp->header.masked_status = status_byte(result); | |
1323 | srp->header.msg_status = msg_byte(result); | |
1324 | srp->header.host_status = host_byte(result); | |
1325 | srp->header.driver_status = driver_byte(result); | |
1da177e4 LT |
1326 | if ((sdp->sgdebug > 0) && |
1327 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1328 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
d811b848 | 1329 | __scsi_print_sense(sdp->device, __func__, sense, |
d6b10348 | 1330 | SCSI_SENSE_BUFFERSIZE); |
1da177e4 LT |
1331 | |
1332 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
d6b10348 MC |
1333 | if (driver_byte(result) != 0 |
1334 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) | |
1da177e4 LT |
1335 | && !scsi_sense_is_deferred(&sshdr) |
1336 | && sshdr.sense_key == UNIT_ATTENTION | |
1337 | && sdp->device->removable) { | |
1338 | /* Detected possible disc change. Set the bit - this */ | |
1339 | /* may be used if there are filesystems using this device */ | |
1340 | sdp->device->changed = 1; | |
1341 | } | |
1342 | } | |
1343 | /* Rely on write phase to clean out srp status values, so no "else" */ | |
1344 | ||
7568615c TB |
1345 | /* |
1346 | * Free the request as soon as it is complete so that its resources | |
1347 | * can be reused without waiting for userspace to read() the | |
1348 | * result. But keep the associated bio (if any) around until | |
1349 | * blk_rq_unmap_user() can be called from user context. | |
1350 | */ | |
1351 | srp->rq = NULL; | |
1352 | if (rq->cmd != rq->__cmd) | |
1353 | kfree(rq->cmd); | |
1354 | __blk_put_request(rq->q, rq); | |
1355 | ||
c6517b79 TB |
1356 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
1357 | if (unlikely(srp->orphan)) { | |
1da177e4 LT |
1358 | if (sfp->keep_orphan) |
1359 | srp->sg_io_owned = 0; | |
c6517b79 TB |
1360 | else |
1361 | done = 0; | |
1da177e4 | 1362 | } |
c6517b79 TB |
1363 | srp->done = done; |
1364 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1365 | ||
1366 | if (likely(done)) { | |
1367 | /* Now wake up any sg_read() that is waiting for this | |
1368 | * packet. | |
1369 | */ | |
1da177e4 | 1370 | wake_up_interruptible(&sfp->read_wait); |
c6517b79 | 1371 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); |
c96952ed | 1372 | kref_put(&sfp->f_ref, sg_remove_sfp); |
015640ed FT |
1373 | } else { |
1374 | INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); | |
1375 | schedule_work(&srp->ew.work); | |
1376 | } | |
1da177e4 LT |
1377 | } |
1378 | ||
828c0950 | 1379 | static const struct file_operations sg_fops = { |
1da177e4 LT |
1380 | .owner = THIS_MODULE, |
1381 | .read = sg_read, | |
1382 | .write = sg_write, | |
1383 | .poll = sg_poll, | |
37b9d1e0 | 1384 | .unlocked_ioctl = sg_ioctl, |
1da177e4 LT |
1385 | #ifdef CONFIG_COMPAT |
1386 | .compat_ioctl = sg_compat_ioctl, | |
1387 | #endif | |
1388 | .open = sg_open, | |
1389 | .mmap = sg_mmap, | |
1390 | .release = sg_release, | |
1391 | .fasync = sg_fasync, | |
6038f373 | 1392 | .llseek = no_llseek, |
1da177e4 LT |
1393 | }; |
1394 | ||
d253878b | 1395 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1396 | |
1397 | static int sg_sysfs_valid = 0; | |
1398 | ||
cc833acb DG |
1399 | static Sg_device * |
1400 | sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) | |
1da177e4 | 1401 | { |
d6b10348 | 1402 | struct request_queue *q = scsidp->request_queue; |
1da177e4 LT |
1403 | Sg_device *sdp; |
1404 | unsigned long iflags; | |
7c07d613 JB |
1405 | int error; |
1406 | u32 k; | |
1da177e4 | 1407 | |
24669f75 | 1408 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
1da177e4 | 1409 | if (!sdp) { |
cc833acb DG |
1410 | sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " |
1411 | "failure\n", __func__); | |
7c07d613 JB |
1412 | return ERR_PTR(-ENOMEM); |
1413 | } | |
c6517b79 | 1414 | |
b98c52b5 | 1415 | idr_preload(GFP_KERNEL); |
7c07d613 | 1416 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 | 1417 | |
b98c52b5 TH |
1418 | error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); |
1419 | if (error < 0) { | |
1420 | if (error == -ENOSPC) { | |
1421 | sdev_printk(KERN_WARNING, scsidp, | |
1422 | "Unable to attach sg device type=%d, minor number exceeds %d\n", | |
1423 | scsidp->type, SG_MAX_DEVS - 1); | |
1424 | error = -ENODEV; | |
1425 | } else { | |
cc833acb DG |
1426 | sdev_printk(KERN_WARNING, scsidp, "%s: idr " |
1427 | "allocation Sg_device failure: %d\n", | |
1428 | __func__, error); | |
b98c52b5 TH |
1429 | } |
1430 | goto out_unlock; | |
1da177e4 | 1431 | } |
b98c52b5 | 1432 | k = error; |
1da177e4 | 1433 | |
95e159d6 HR |
1434 | SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, |
1435 | "sg_alloc: dev=%d \n", k)); | |
1da177e4 LT |
1436 | sprintf(disk->disk_name, "sg%d", k); |
1437 | disk->first_minor = k; | |
1438 | sdp->disk = disk; | |
1439 | sdp->device = scsidp; | |
cc833acb | 1440 | mutex_init(&sdp->open_rel_lock); |
3442f802 | 1441 | INIT_LIST_HEAD(&sdp->sfds); |
cc833acb DG |
1442 | init_waitqueue_head(&sdp->open_wait); |
1443 | atomic_set(&sdp->detaching, 0); | |
1444 | rwlock_init(&sdp->sfd_lock); | |
8a78362c | 1445 | sdp->sg_tablesize = queue_max_segments(q); |
7c07d613 | 1446 | sdp->index = k; |
c6517b79 | 1447 | kref_init(&sdp->d_ref); |
b98c52b5 | 1448 | error = 0; |
c6517b79 | 1449 | |
b98c52b5 | 1450 | out_unlock: |
c6517b79 | 1451 | write_unlock_irqrestore(&sg_index_lock, iflags); |
b98c52b5 | 1452 | idr_preload_end(); |
1da177e4 | 1453 | |
7c07d613 | 1454 | if (error) { |
1da177e4 | 1455 | kfree(sdp); |
7c07d613 JB |
1456 | return ERR_PTR(error); |
1457 | } | |
1458 | return sdp; | |
1da177e4 LT |
1459 | } |
1460 | ||
1461 | static int | |
cc833acb | 1462 | sg_add_device(struct device *cl_dev, struct class_interface *cl_intf) |
1da177e4 | 1463 | { |
ee959b00 | 1464 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1da177e4 LT |
1465 | struct gendisk *disk; |
1466 | Sg_device *sdp = NULL; | |
1467 | struct cdev * cdev = NULL; | |
7c07d613 | 1468 | int error; |
454e8957 | 1469 | unsigned long iflags; |
1da177e4 LT |
1470 | |
1471 | disk = alloc_disk(1); | |
1472 | if (!disk) { | |
cc833acb | 1473 | pr_warn("%s: alloc_disk failed\n", __func__); |
1da177e4 LT |
1474 | return -ENOMEM; |
1475 | } | |
1476 | disk->major = SCSI_GENERIC_MAJOR; | |
1477 | ||
1478 | error = -ENOMEM; | |
1479 | cdev = cdev_alloc(); | |
1480 | if (!cdev) { | |
cc833acb | 1481 | pr_warn("%s: cdev_alloc failed\n", __func__); |
1da177e4 LT |
1482 | goto out; |
1483 | } | |
1484 | cdev->owner = THIS_MODULE; | |
1485 | cdev->ops = &sg_fops; | |
1486 | ||
7c07d613 JB |
1487 | sdp = sg_alloc(disk, scsidp); |
1488 | if (IS_ERR(sdp)) { | |
cc833acb | 1489 | pr_warn("%s: sg_alloc failed\n", __func__); |
7c07d613 | 1490 | error = PTR_ERR(sdp); |
1da177e4 LT |
1491 | goto out; |
1492 | } | |
1da177e4 | 1493 | |
7c07d613 | 1494 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
5e3c34c1 | 1495 | if (error) |
454e8957 | 1496 | goto cdev_add_err; |
5e3c34c1 | 1497 | |
1da177e4 LT |
1498 | sdp->cdev = cdev; |
1499 | if (sg_sysfs_valid) { | |
ee959b00 | 1500 | struct device *sg_class_member; |
1da177e4 | 1501 | |
d73a1a67 GKH |
1502 | sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, |
1503 | MKDEV(SCSI_GENERIC_MAJOR, | |
1504 | sdp->index), | |
1505 | sdp, "%s", disk->disk_name); | |
d07e0361 | 1506 | if (IS_ERR(sg_class_member)) { |
cc833acb | 1507 | pr_err("%s: device_create failed\n", __func__); |
d07e0361 FT |
1508 | error = PTR_ERR(sg_class_member); |
1509 | goto cdev_add_err; | |
1510 | } | |
d07e0361 | 1511 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
1da177e4 LT |
1512 | &sg_class_member->kobj, "generic"); |
1513 | if (error) | |
cc833acb DG |
1514 | pr_err("%s: unable to make symlink 'generic' back " |
1515 | "to sg%d\n", __func__, sdp->index); | |
1da177e4 | 1516 | } else |
cc833acb | 1517 | pr_warn("%s: sg_sys Invalid\n", __func__); |
1da177e4 | 1518 | |
cc833acb DG |
1519 | sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d " |
1520 | "type %d\n", sdp->index, scsidp->type); | |
1da177e4 | 1521 | |
ee959b00 | 1522 | dev_set_drvdata(cl_dev, sdp); |
a24484f2 | 1523 | |
1da177e4 LT |
1524 | return 0; |
1525 | ||
454e8957 | 1526 | cdev_add_err: |
7c07d613 JB |
1527 | write_lock_irqsave(&sg_index_lock, iflags); |
1528 | idr_remove(&sg_index_idr, sdp->index); | |
1529 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1530 | kfree(sdp); | |
454e8957 | 1531 | |
1da177e4 LT |
1532 | out: |
1533 | put_disk(disk); | |
1534 | if (cdev) | |
1535 | cdev_del(cdev); | |
1536 | return error; | |
1537 | } | |
1538 | ||
cc833acb DG |
1539 | static void |
1540 | sg_device_destroy(struct kref *kref) | |
c6517b79 TB |
1541 | { |
1542 | struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); | |
1543 | unsigned long flags; | |
1544 | ||
1545 | /* CAUTION! Note that the device can still be found via idr_find() | |
1546 | * even though the refcount is 0. Therefore, do idr_remove() BEFORE | |
1547 | * any other cleanup. | |
1548 | */ | |
1549 | ||
1550 | write_lock_irqsave(&sg_index_lock, flags); | |
1551 | idr_remove(&sg_index_idr, sdp->index); | |
1552 | write_unlock_irqrestore(&sg_index_lock, flags); | |
1553 | ||
1554 | SCSI_LOG_TIMEOUT(3, | |
95e159d6 | 1555 | sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); |
c6517b79 TB |
1556 | |
1557 | put_disk(sdp->disk); | |
1558 | kfree(sdp); | |
1559 | } | |
1560 | ||
cc833acb DG |
1561 | static void |
1562 | sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) | |
1da177e4 | 1563 | { |
ee959b00 TJ |
1564 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1565 | Sg_device *sdp = dev_get_drvdata(cl_dev); | |
1da177e4 LT |
1566 | unsigned long iflags; |
1567 | Sg_fd *sfp; | |
cc833acb | 1568 | int val; |
1da177e4 | 1569 | |
cc833acb | 1570 | if (!sdp) |
1da177e4 | 1571 | return; |
cc833acb DG |
1572 | /* want sdp->detaching non-zero as soon as possible */ |
1573 | val = atomic_inc_return(&sdp->detaching); | |
1574 | if (val > 1) | |
1575 | return; /* only want to do following once per device */ | |
7c07d613 | 1576 | |
95e159d6 HR |
1577 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
1578 | "%s\n", __func__)); | |
c6517b79 | 1579 | |
cc833acb | 1580 | read_lock_irqsave(&sdp->sfd_lock, iflags); |
3442f802 | 1581 | list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { |
cc833acb | 1582 | wake_up_interruptible_all(&sfp->read_wait); |
c6517b79 | 1583 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); |
7c07d613 | 1584 | } |
cc833acb DG |
1585 | wake_up_interruptible_all(&sdp->open_wait); |
1586 | read_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
7c07d613 JB |
1587 | |
1588 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
ee959b00 | 1589 | device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
7c07d613 JB |
1590 | cdev_del(sdp->cdev); |
1591 | sdp->cdev = NULL; | |
1da177e4 | 1592 | |
cc833acb | 1593 | kref_put(&sdp->d_ref, sg_device_destroy); |
1da177e4 LT |
1594 | } |
1595 | ||
6460e75a DG |
1596 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
1597 | module_param_named(def_reserved_size, def_reserved_size, int, | |
1598 | S_IRUGO | S_IWUSR); | |
1da177e4 LT |
1599 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
1600 | ||
1601 | MODULE_AUTHOR("Douglas Gilbert"); | |
1602 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1603 | MODULE_LICENSE("GPL"); | |
1604 | MODULE_VERSION(SG_VERSION_STR); | |
f018fa55 | 1605 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
1da177e4 | 1606 | |
6460e75a DG |
1607 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
1608 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); | |
1da177e4 LT |
1609 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
1610 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1611 | ||
1612 | static int __init | |
1613 | init_sg(void) | |
1614 | { | |
1615 | int rc; | |
1616 | ||
6460e75a DG |
1617 | if (scatter_elem_sz < PAGE_SIZE) { |
1618 | scatter_elem_sz = PAGE_SIZE; | |
1619 | scatter_elem_sz_prev = scatter_elem_sz; | |
1620 | } | |
1da177e4 LT |
1621 | if (def_reserved_size >= 0) |
1622 | sg_big_buff = def_reserved_size; | |
6460e75a DG |
1623 | else |
1624 | def_reserved_size = sg_big_buff; | |
1da177e4 LT |
1625 | |
1626 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1627 | SG_MAX_DEVS, "sg"); | |
1628 | if (rc) | |
1629 | return rc; | |
d253878b | 1630 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
1da177e4 LT |
1631 | if ( IS_ERR(sg_sysfs_class) ) { |
1632 | rc = PTR_ERR(sg_sysfs_class); | |
1633 | goto err_out; | |
1634 | } | |
1635 | sg_sysfs_valid = 1; | |
1636 | rc = scsi_register_interface(&sg_interface); | |
1637 | if (0 == rc) { | |
1638 | #ifdef CONFIG_SCSI_PROC_FS | |
1639 | sg_proc_init(); | |
1640 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1641 | return 0; | |
1642 | } | |
d253878b | 1643 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1644 | err_out: |
1645 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1646 | return rc; | |
1647 | } | |
1648 | ||
1649 | static void __exit | |
1650 | exit_sg(void) | |
1651 | { | |
1652 | #ifdef CONFIG_SCSI_PROC_FS | |
1653 | sg_proc_cleanup(); | |
1654 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1655 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1656 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1657 | sg_sysfs_valid = 0; |
1658 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1659 | SG_MAX_DEVS); | |
7c07d613 | 1660 | idr_destroy(&sg_index_idr); |
1da177e4 LT |
1661 | } |
1662 | ||
cc833acb DG |
1663 | static int |
1664 | sg_start_req(Sg_request *srp, unsigned char *cmd) | |
10865dfa | 1665 | { |
626710c9 | 1666 | int res; |
10865dfa | 1667 | struct request *rq; |
44c7b0ea FT |
1668 | Sg_fd *sfp = srp->parentfp; |
1669 | sg_io_hdr_t *hp = &srp->header; | |
1670 | int dxfer_len = (int) hp->dxfer_len; | |
1671 | int dxfer_dir = hp->dxfer_direction; | |
626710c9 | 1672 | unsigned int iov_count = hp->iovec_count; |
44c7b0ea FT |
1673 | Sg_scatter_hold *req_schp = &srp->data; |
1674 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1675 | struct request_queue *q = sfp->parentdp->device->request_queue; | |
626710c9 | 1676 | struct rq_map_data *md, map_data; |
10865dfa | 1677 | int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; |
65c26a0f | 1678 | unsigned char *long_cmdp = NULL; |
10865dfa | 1679 | |
95e159d6 HR |
1680 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1681 | "sg_start_req: dxfer_len=%d\n", | |
1682 | dxfer_len)); | |
44c7b0ea | 1683 | |
65c26a0f DG |
1684 | if (hp->cmd_len > BLK_MAX_CDB) { |
1685 | long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL); | |
1686 | if (!long_cmdp) | |
1687 | return -ENOMEM; | |
1688 | } | |
1689 | ||
7772855a TB |
1690 | /* |
1691 | * NOTE | |
1692 | * | |
1693 | * With scsi-mq enabled, there are a fixed number of preallocated | |
1694 | * requests equal in number to shost->can_queue. If all of the | |
1695 | * preallocated requests are already in use, then using GFP_ATOMIC with | |
1696 | * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL | |
1697 | * will cause blk_get_request() to sleep until an active command | |
1698 | * completes, freeing up a request. Neither option is ideal, but | |
1699 | * GFP_KERNEL is the better choice to prevent userspace from getting an | |
1700 | * unexpected EWOULDBLOCK. | |
1701 | * | |
1702 | * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually | |
1703 | * does not sleep except under memory pressure. | |
1704 | */ | |
1705 | rq = blk_get_request(q, rw, GFP_KERNEL); | |
a492f075 | 1706 | if (IS_ERR(rq)) { |
65c26a0f | 1707 | kfree(long_cmdp); |
a492f075 | 1708 | return PTR_ERR(rq); |
65c26a0f | 1709 | } |
10865dfa | 1710 | |
f27b087b | 1711 | blk_rq_set_block_pc(rq); |
65c26a0f DG |
1712 | |
1713 | if (hp->cmd_len > BLK_MAX_CDB) | |
1714 | rq->cmd = long_cmdp; | |
10865dfa | 1715 | memcpy(rq->cmd, cmd, hp->cmd_len); |
10865dfa | 1716 | rq->cmd_len = hp->cmd_len; |
10865dfa FT |
1717 | |
1718 | srp->rq = rq; | |
1719 | rq->end_io_data = srp; | |
1720 | rq->sense = srp->sense_b; | |
1721 | rq->retries = SG_DEFAULT_RETRIES; | |
1722 | ||
1da177e4 | 1723 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) |
10db10d1 | 1724 | return 0; |
10865dfa | 1725 | |
626710c9 FT |
1726 | if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && |
1727 | dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && | |
1728 | !sfp->parentdp->device->host->unchecked_isa_dma && | |
2610a254 | 1729 | blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) |
626710c9 FT |
1730 | md = NULL; |
1731 | else | |
1732 | md = &map_data; | |
1733 | ||
1734 | if (md) { | |
1735 | if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) | |
1736 | sg_link_reserve(sfp, srp, dxfer_len); | |
1737 | else { | |
1738 | res = sg_build_indirect(req_schp, sfp, dxfer_len); | |
1739 | if (res) | |
1740 | return res; | |
1741 | } | |
7e56cb0f | 1742 | |
626710c9 FT |
1743 | md->pages = req_schp->pages; |
1744 | md->page_order = req_schp->page_order; | |
1745 | md->nr_entries = req_schp->k_use_sg; | |
56c451f4 | 1746 | md->offset = 0; |
97ae77a1 | 1747 | md->null_mapped = hp->dxferp ? 0 : 1; |
ecb554a8 FT |
1748 | if (dxfer_dir == SG_DXFER_TO_FROM_DEV) |
1749 | md->from_user = 1; | |
1750 | else | |
1751 | md->from_user = 0; | |
626710c9 FT |
1752 | } |
1753 | ||
0fdf96b6 | 1754 | if (iov_count) { |
fdc81f45 | 1755 | struct iovec *iov = NULL; |
26e49cfc | 1756 | struct iov_iter i; |
0fdf96b6 | 1757 | |
fdc81f45 AV |
1758 | res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i); |
1759 | if (res < 0) | |
1760 | return res; | |
0fdf96b6 | 1761 | |
fdc81f45 | 1762 | iov_iter_truncate(&i, hp->dxfer_len); |
0fdf96b6 | 1763 | |
26e49cfc | 1764 | res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC); |
0fdf96b6 FT |
1765 | kfree(iov); |
1766 | } else | |
626710c9 FT |
1767 | res = blk_rq_map_user(q, rq, md, hp->dxferp, |
1768 | hp->dxfer_len, GFP_ATOMIC); | |
10db10d1 FT |
1769 | |
1770 | if (!res) { | |
626710c9 | 1771 | srp->bio = rq->bio; |
10db10d1 | 1772 | |
626710c9 FT |
1773 | if (!md) { |
1774 | req_schp->dio_in_use = 1; | |
1775 | hp->info |= SG_INFO_DIRECT_IO; | |
1776 | } | |
1777 | } | |
10db10d1 | 1778 | return res; |
1da177e4 LT |
1779 | } |
1780 | ||
cc833acb DG |
1781 | static int |
1782 | sg_finish_rem_req(Sg_request *srp) | |
1da177e4 | 1783 | { |
e7ee4cc0 FT |
1784 | int ret = 0; |
1785 | ||
1da177e4 LT |
1786 | Sg_fd *sfp = srp->parentfp; |
1787 | Sg_scatter_hold *req_schp = &srp->data; | |
1788 | ||
95e159d6 HR |
1789 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1790 | "sg_finish_rem_req: res_used=%d\n", | |
1791 | (int) srp->res_used)); | |
7568615c TB |
1792 | if (srp->bio) |
1793 | ret = blk_rq_unmap_user(srp->bio); | |
10db10d1 | 1794 | |
7568615c | 1795 | if (srp->rq) { |
65c26a0f DG |
1796 | if (srp->rq->cmd != srp->rq->__cmd) |
1797 | kfree(srp->rq->cmd); | |
10865dfa | 1798 | blk_put_request(srp->rq); |
6e5a30cb | 1799 | } |
10865dfa | 1800 | |
e27168f8 CS |
1801 | if (srp->res_used) |
1802 | sg_unlink_reserve(sfp, srp); | |
1803 | else | |
95e159d6 | 1804 | sg_remove_scat(sfp, req_schp); |
e27168f8 | 1805 | |
1da177e4 | 1806 | sg_remove_request(sfp, srp); |
e7ee4cc0 FT |
1807 | |
1808 | return ret; | |
1da177e4 LT |
1809 | } |
1810 | ||
1811 | static int | |
1812 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1813 | { | |
10db10d1 | 1814 | int sg_bufflen = tablesize * sizeof(struct page *); |
2d20eaf9 | 1815 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 1816 | |
10db10d1 FT |
1817 | schp->pages = kzalloc(sg_bufflen, gfp_flags); |
1818 | if (!schp->pages) | |
1da177e4 | 1819 | return -ENOMEM; |
1da177e4 | 1820 | schp->sglist_len = sg_bufflen; |
d6b10348 | 1821 | return tablesize; /* number of scat_gath elements allocated */ |
1da177e4 LT |
1822 | } |
1823 | ||
1da177e4 LT |
1824 | static int |
1825 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1826 | { | |
10db10d1 | 1827 | int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; |
d6b10348 | 1828 | int sg_tablesize = sfp->parentdp->sg_tablesize; |
10db10d1 FT |
1829 | int blk_size = buff_size, order; |
1830 | gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; | |
1da177e4 | 1831 | |
fb119935 | 1832 | if (blk_size < 0) |
1da177e4 LT |
1833 | return -EFAULT; |
1834 | if (0 == blk_size) | |
1835 | ++blk_size; /* don't know why */ | |
b2ed6c69 FT |
1836 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ |
1837 | blk_size = ALIGN(blk_size, SG_SECTOR_SZ); | |
95e159d6 HR |
1838 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1839 | "sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1840 | buff_size, blk_size)); | |
d6b10348 MC |
1841 | |
1842 | /* N.B. ret_sz carried into this block ... */ | |
1843 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1844 | if (mx_sc_elems < 0) | |
1845 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1846 | ||
6460e75a DG |
1847 | num = scatter_elem_sz; |
1848 | if (unlikely(num != scatter_elem_sz_prev)) { | |
1849 | if (num < PAGE_SIZE) { | |
1850 | scatter_elem_sz = PAGE_SIZE; | |
1851 | scatter_elem_sz_prev = PAGE_SIZE; | |
1852 | } else | |
1853 | scatter_elem_sz_prev = num; | |
1854 | } | |
10db10d1 FT |
1855 | |
1856 | if (sfp->low_dma) | |
1857 | gfp_mask |= GFP_DMA; | |
1858 | ||
1859 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1860 | gfp_mask |= __GFP_ZERO; | |
1861 | ||
1862 | order = get_order(num); | |
1863 | retry: | |
1864 | ret_sz = 1 << (PAGE_SHIFT + order); | |
1865 | ||
1866 | for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; | |
1867 | k++, rem_sz -= ret_sz) { | |
1868 | ||
6460e75a | 1869 | num = (rem_sz > scatter_elem_sz_prev) ? |
10db10d1 FT |
1870 | scatter_elem_sz_prev : rem_sz; |
1871 | ||
1872 | schp->pages[k] = alloc_pages(gfp_mask, order); | |
1873 | if (!schp->pages[k]) | |
1874 | goto out; | |
d6b10348 | 1875 | |
6460e75a DG |
1876 | if (num == scatter_elem_sz_prev) { |
1877 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { | |
1878 | scatter_elem_sz = ret_sz; | |
1879 | scatter_elem_sz_prev = ret_sz; | |
1880 | } | |
1881 | } | |
d6b10348 | 1882 | |
95e159d6 HR |
1883 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
1884 | "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", | |
1885 | k, num, ret_sz)); | |
d6b10348 MC |
1886 | } /* end of for loop */ |
1887 | ||
10db10d1 | 1888 | schp->page_order = order; |
d6b10348 | 1889 | schp->k_use_sg = k; |
95e159d6 HR |
1890 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
1891 | "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", | |
1892 | k, rem_sz)); | |
d6b10348 MC |
1893 | |
1894 | schp->bufflen = blk_size; | |
1895 | if (rem_sz > 0) /* must have failed */ | |
1896 | return -ENOMEM; | |
1da177e4 | 1897 | return 0; |
10db10d1 FT |
1898 | out: |
1899 | for (i = 0; i < k; i++) | |
e71044ee | 1900 | __free_pages(schp->pages[i], order); |
10db10d1 FT |
1901 | |
1902 | if (--order >= 0) | |
1903 | goto retry; | |
1904 | ||
1905 | return -ENOMEM; | |
1da177e4 LT |
1906 | } |
1907 | ||
1da177e4 | 1908 | static void |
95e159d6 | 1909 | sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) |
1da177e4 | 1910 | { |
95e159d6 HR |
1911 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1912 | "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
10db10d1 | 1913 | if (schp->pages && schp->sglist_len > 0) { |
6e5a30cb | 1914 | if (!schp->dio_in_use) { |
1da177e4 LT |
1915 | int k; |
1916 | ||
10db10d1 | 1917 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
95e159d6 HR |
1918 | SCSI_LOG_TIMEOUT(5, |
1919 | sg_printk(KERN_INFO, sfp->parentdp, | |
1920 | "sg_remove_scat: k=%d, pg=0x%p\n", | |
1921 | k, schp->pages[k])); | |
10db10d1 | 1922 | __free_pages(schp->pages[k], schp->page_order); |
1da177e4 | 1923 | } |
6e5a30cb | 1924 | |
10db10d1 | 1925 | kfree(schp->pages); |
1da177e4 | 1926 | } |
d6b10348 | 1927 | } |
1da177e4 LT |
1928 | memset(schp, 0, sizeof (*schp)); |
1929 | } | |
1930 | ||
1da177e4 LT |
1931 | static int |
1932 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
1933 | { | |
1934 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 1935 | int k, num; |
1da177e4 | 1936 | |
95e159d6 HR |
1937 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
1938 | "sg_read_oxfer: num_read_xfer=%d\n", | |
1939 | num_read_xfer)); | |
1da177e4 LT |
1940 | if ((!outp) || (num_read_xfer <= 0)) |
1941 | return 0; | |
d6b10348 | 1942 | |
10db10d1 FT |
1943 | num = 1 << (PAGE_SHIFT + schp->page_order); |
1944 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { | |
d6b10348 | 1945 | if (num > num_read_xfer) { |
10db10d1 | 1946 | if (__copy_to_user(outp, page_address(schp->pages[k]), |
d6b10348 MC |
1947 | num_read_xfer)) |
1948 | return -EFAULT; | |
1949 | break; | |
1950 | } else { | |
10db10d1 | 1951 | if (__copy_to_user(outp, page_address(schp->pages[k]), |
d6b10348 MC |
1952 | num)) |
1953 | return -EFAULT; | |
1954 | num_read_xfer -= num; | |
1955 | if (num_read_xfer <= 0) | |
1da177e4 | 1956 | break; |
d6b10348 | 1957 | outp += num; |
1da177e4 | 1958 | } |
1da177e4 | 1959 | } |
d6b10348 | 1960 | |
1da177e4 LT |
1961 | return 0; |
1962 | } | |
1963 | ||
1964 | static void | |
1965 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
1966 | { | |
1967 | Sg_scatter_hold *schp = &sfp->reserve; | |
1968 | ||
95e159d6 HR |
1969 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1970 | "sg_build_reserve: req_size=%d\n", req_size)); | |
1da177e4 LT |
1971 | do { |
1972 | if (req_size < PAGE_SIZE) | |
1973 | req_size = PAGE_SIZE; | |
1974 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
1975 | return; | |
1976 | else | |
95e159d6 | 1977 | sg_remove_scat(sfp, schp); |
1da177e4 LT |
1978 | req_size >>= 1; /* divide by 2 */ |
1979 | } while (req_size > (PAGE_SIZE / 2)); | |
1980 | } | |
1981 | ||
1982 | static void | |
1983 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
1984 | { | |
1985 | Sg_scatter_hold *req_schp = &srp->data; | |
1986 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
d6b10348 | 1987 | int k, num, rem; |
1da177e4 LT |
1988 | |
1989 | srp->res_used = 1; | |
95e159d6 HR |
1990 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1991 | "sg_link_reserve: size=%d\n", size)); | |
eca7be5e | 1992 | rem = size; |
d6b10348 | 1993 | |
10db10d1 FT |
1994 | num = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1995 | for (k = 0; k < rsv_schp->k_use_sg; k++) { | |
d6b10348 | 1996 | if (rem <= num) { |
d6b10348 MC |
1997 | req_schp->k_use_sg = k + 1; |
1998 | req_schp->sglist_len = rsv_schp->sglist_len; | |
10db10d1 | 1999 | req_schp->pages = rsv_schp->pages; |
d6b10348 MC |
2000 | |
2001 | req_schp->bufflen = size; | |
10db10d1 | 2002 | req_schp->page_order = rsv_schp->page_order; |
d6b10348 MC |
2003 | break; |
2004 | } else | |
2005 | rem -= num; | |
1da177e4 | 2006 | } |
d6b10348 MC |
2007 | |
2008 | if (k >= rsv_schp->k_use_sg) | |
95e159d6 HR |
2009 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
2010 | "sg_link_reserve: BAD size\n")); | |
1da177e4 LT |
2011 | } |
2012 | ||
2013 | static void | |
2014 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2015 | { | |
2016 | Sg_scatter_hold *req_schp = &srp->data; | |
1da177e4 | 2017 | |
95e159d6 HR |
2018 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
2019 | "sg_unlink_reserve: req->k_use_sg=%d\n", | |
2020 | (int) req_schp->k_use_sg)); | |
1da177e4 LT |
2021 | req_schp->k_use_sg = 0; |
2022 | req_schp->bufflen = 0; | |
10db10d1 FT |
2023 | req_schp->pages = NULL; |
2024 | req_schp->page_order = 0; | |
1da177e4 LT |
2025 | req_schp->sglist_len = 0; |
2026 | sfp->save_scat_len = 0; | |
2027 | srp->res_used = 0; | |
2028 | } | |
2029 | ||
2030 | static Sg_request * | |
2031 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
2032 | { | |
2033 | Sg_request *resp; | |
2034 | unsigned long iflags; | |
2035 | ||
2036 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2037 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { | |
2038 | /* look for requests that are ready + not SG_IO owned */ | |
2039 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
2040 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
2041 | resp->done = 2; /* guard against other readers */ | |
2042 | break; | |
2043 | } | |
2044 | } | |
2045 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2046 | return resp; | |
2047 | } | |
2048 | ||
1da177e4 LT |
2049 | /* always adds to end of list */ |
2050 | static Sg_request * | |
2051 | sg_add_request(Sg_fd * sfp) | |
2052 | { | |
2053 | int k; | |
2054 | unsigned long iflags; | |
2055 | Sg_request *resp; | |
2056 | Sg_request *rp = sfp->req_arr; | |
2057 | ||
2058 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2059 | resp = sfp->headrp; | |
2060 | if (!resp) { | |
2061 | memset(rp, 0, sizeof (Sg_request)); | |
2062 | rp->parentfp = sfp; | |
2063 | resp = rp; | |
2064 | sfp->headrp = resp; | |
2065 | } else { | |
2066 | if (0 == sfp->cmd_q) | |
2067 | resp = NULL; /* command queuing disallowed */ | |
2068 | else { | |
2069 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2070 | if (!rp->parentfp) | |
2071 | break; | |
2072 | } | |
2073 | if (k < SG_MAX_QUEUE) { | |
2074 | memset(rp, 0, sizeof (Sg_request)); | |
2075 | rp->parentfp = sfp; | |
2076 | while (resp->nextrp) | |
2077 | resp = resp->nextrp; | |
2078 | resp->nextrp = rp; | |
2079 | resp = rp; | |
2080 | } else | |
2081 | resp = NULL; | |
2082 | } | |
2083 | } | |
2084 | if (resp) { | |
2085 | resp->nextrp = NULL; | |
cb59e840 | 2086 | resp->header.duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
2087 | } |
2088 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2089 | return resp; | |
2090 | } | |
2091 | ||
2092 | /* Return of 1 for found; 0 for not found */ | |
2093 | static int | |
2094 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2095 | { | |
2096 | Sg_request *prev_rp; | |
2097 | Sg_request *rp; | |
2098 | unsigned long iflags; | |
2099 | int res = 0; | |
2100 | ||
2101 | if ((!sfp) || (!srp) || (!sfp->headrp)) | |
2102 | return res; | |
2103 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2104 | prev_rp = sfp->headrp; | |
2105 | if (srp == prev_rp) { | |
2106 | sfp->headrp = prev_rp->nextrp; | |
2107 | prev_rp->parentfp = NULL; | |
2108 | res = 1; | |
2109 | } else { | |
2110 | while ((rp = prev_rp->nextrp)) { | |
2111 | if (srp == rp) { | |
2112 | prev_rp->nextrp = rp->nextrp; | |
2113 | rp->parentfp = NULL; | |
2114 | res = 1; | |
2115 | break; | |
2116 | } | |
2117 | prev_rp = rp; | |
2118 | } | |
2119 | } | |
2120 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2121 | return res; | |
2122 | } | |
2123 | ||
1da177e4 | 2124 | static Sg_fd * |
95e159d6 | 2125 | sg_add_sfp(Sg_device * sdp) |
1da177e4 LT |
2126 | { |
2127 | Sg_fd *sfp; | |
2128 | unsigned long iflags; | |
44ec9542 | 2129 | int bufflen; |
1da177e4 | 2130 | |
d6b10348 | 2131 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
1da177e4 | 2132 | if (!sfp) |
cc833acb | 2133 | return ERR_PTR(-ENOMEM); |
d6b10348 | 2134 | |
1da177e4 LT |
2135 | init_waitqueue_head(&sfp->read_wait); |
2136 | rwlock_init(&sfp->rq_list_lock); | |
2137 | ||
c6517b79 | 2138 | kref_init(&sfp->f_ref); |
1da177e4 LT |
2139 | sfp->timeout = SG_DEFAULT_TIMEOUT; |
2140 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2141 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
2142 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? | |
2143 | sdp->device->host->unchecked_isa_dma : 1; | |
2144 | sfp->cmd_q = SG_DEF_COMMAND_Q; | |
2145 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2146 | sfp->parentdp = sdp; | |
cc833acb DG |
2147 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
2148 | if (atomic_read(&sdp->detaching)) { | |
2149 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
2150 | return ERR_PTR(-ENODEV); | |
2151 | } | |
3442f802 | 2152 | list_add_tail(&sfp->sfd_siblings, &sdp->sfds); |
cc833acb | 2153 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
95e159d6 HR |
2154 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
2155 | "sg_add_sfp: sfp=0x%p\n", sfp)); | |
6460e75a DG |
2156 | if (unlikely(sg_big_buff != def_reserved_size)) |
2157 | sg_big_buff = def_reserved_size; | |
2158 | ||
44ec9542 | 2159 | bufflen = min_t(int, sg_big_buff, |
46f69e6a | 2160 | max_sectors_bytes(sdp->device->request_queue)); |
44ec9542 | 2161 | sg_build_reserve(sfp, bufflen); |
95e159d6 HR |
2162 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
2163 | "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", | |
2164 | sfp->reserve.bufflen, | |
2165 | sfp->reserve.k_use_sg)); | |
c6517b79 TB |
2166 | |
2167 | kref_get(&sdp->d_ref); | |
2168 | __module_get(THIS_MODULE); | |
1da177e4 LT |
2169 | return sfp; |
2170 | } | |
2171 | ||
cc833acb DG |
2172 | static void |
2173 | sg_remove_sfp_usercontext(struct work_struct *work) | |
1da177e4 | 2174 | { |
c6517b79 TB |
2175 | struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); |
2176 | struct sg_device *sdp = sfp->parentdp; | |
2177 | ||
2178 | /* Cleanup any responses which were never read(). */ | |
2179 | while (sfp->headrp) | |
2180 | sg_finish_rem_req(sfp->headrp); | |
1da177e4 | 2181 | |
1da177e4 | 2182 | if (sfp->reserve.bufflen > 0) { |
95e159d6 HR |
2183 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
2184 | "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
c6517b79 TB |
2185 | (int) sfp->reserve.bufflen, |
2186 | (int) sfp->reserve.k_use_sg)); | |
95e159d6 | 2187 | sg_remove_scat(sfp, &sfp->reserve); |
1da177e4 | 2188 | } |
c6517b79 | 2189 | |
95e159d6 HR |
2190 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
2191 | "sg_remove_sfp: sfp=0x%p\n", sfp)); | |
d6b10348 | 2192 | kfree(sfp); |
c6517b79 TB |
2193 | |
2194 | scsi_device_put(sdp->device); | |
cc833acb | 2195 | kref_put(&sdp->d_ref, sg_device_destroy); |
c6517b79 | 2196 | module_put(THIS_MODULE); |
1da177e4 LT |
2197 | } |
2198 | ||
cc833acb DG |
2199 | static void |
2200 | sg_remove_sfp(struct kref *kref) | |
1da177e4 | 2201 | { |
c6517b79 | 2202 | struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); |
065b4a2f | 2203 | struct sg_device *sdp = sfp->parentdp; |
c6517b79 | 2204 | unsigned long iflags; |
1da177e4 | 2205 | |
cc833acb | 2206 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
3442f802 | 2207 | list_del(&sfp->sfd_siblings); |
cc833acb | 2208 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
1da177e4 | 2209 | |
015640ed FT |
2210 | INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); |
2211 | schedule_work(&sfp->ew.work); | |
1da177e4 LT |
2212 | } |
2213 | ||
2214 | static int | |
2215 | sg_res_in_use(Sg_fd * sfp) | |
2216 | { | |
2217 | const Sg_request *srp; | |
2218 | unsigned long iflags; | |
2219 | ||
2220 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2221 | for (srp = sfp->headrp; srp; srp = srp->nextrp) | |
2222 | if (srp->res_used) | |
2223 | break; | |
2224 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2225 | return srp ? 1 : 0; | |
2226 | } | |
2227 | ||
1da177e4 | 2228 | #ifdef CONFIG_SCSI_PROC_FS |
7c07d613 JB |
2229 | static int |
2230 | sg_idr_max_id(int id, void *p, void *data) | |
2231 | { | |
2232 | int *k = data; | |
2233 | ||
2234 | if (*k < id) | |
2235 | *k = id; | |
2236 | ||
2237 | return 0; | |
2238 | } | |
2239 | ||
1da177e4 LT |
2240 | static int |
2241 | sg_last_dev(void) | |
2242 | { | |
53474c04 | 2243 | int k = -1; |
1da177e4 LT |
2244 | unsigned long iflags; |
2245 | ||
7c07d613 JB |
2246 | read_lock_irqsave(&sg_index_lock, iflags); |
2247 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); | |
2248 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 LT |
2249 | return k + 1; /* origin 1 */ |
2250 | } | |
2251 | #endif | |
2252 | ||
c6517b79 TB |
2253 | /* must be called with sg_index_lock held */ |
2254 | static Sg_device *sg_lookup_dev(int dev) | |
1da177e4 | 2255 | { |
c6517b79 TB |
2256 | return idr_find(&sg_index_idr, dev); |
2257 | } | |
1da177e4 | 2258 | |
cc833acb DG |
2259 | static Sg_device * |
2260 | sg_get_dev(int dev) | |
c6517b79 TB |
2261 | { |
2262 | struct sg_device *sdp; | |
2263 | unsigned long flags; | |
2264 | ||
2265 | read_lock_irqsave(&sg_index_lock, flags); | |
2266 | sdp = sg_lookup_dev(dev); | |
2267 | if (!sdp) | |
2268 | sdp = ERR_PTR(-ENXIO); | |
cc833acb DG |
2269 | else if (atomic_read(&sdp->detaching)) { |
2270 | /* If sdp->detaching, then the refcount may already be 0, in | |
c6517b79 TB |
2271 | * which case it would be a bug to do kref_get(). |
2272 | */ | |
2273 | sdp = ERR_PTR(-ENODEV); | |
2274 | } else | |
2275 | kref_get(&sdp->d_ref); | |
2276 | read_unlock_irqrestore(&sg_index_lock, flags); | |
7c07d613 | 2277 | |
1da177e4 LT |
2278 | return sdp; |
2279 | } | |
2280 | ||
2281 | #ifdef CONFIG_SCSI_PROC_FS | |
2282 | ||
2283 | static struct proc_dir_entry *sg_proc_sgp = NULL; | |
2284 | ||
2285 | static char sg_proc_sg_dirname[] = "scsi/sg"; | |
2286 | ||
2287 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); | |
2288 | ||
2289 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2290 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2291 | size_t count, loff_t *off); | |
828c0950 AD |
2292 | static const struct file_operations adio_fops = { |
2293 | .owner = THIS_MODULE, | |
1da177e4 | 2294 | .open = sg_proc_single_open_adio, |
828c0950 AD |
2295 | .read = seq_read, |
2296 | .llseek = seq_lseek, | |
1da177e4 LT |
2297 | .write = sg_proc_write_adio, |
2298 | .release = single_release, | |
2299 | }; | |
2300 | ||
2301 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2302 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2303 | const char __user *buffer, size_t count, loff_t *off); | |
828c0950 AD |
2304 | static const struct file_operations dressz_fops = { |
2305 | .owner = THIS_MODULE, | |
1da177e4 | 2306 | .open = sg_proc_single_open_dressz, |
828c0950 AD |
2307 | .read = seq_read, |
2308 | .llseek = seq_lseek, | |
1da177e4 LT |
2309 | .write = sg_proc_write_dressz, |
2310 | .release = single_release, | |
2311 | }; | |
2312 | ||
2313 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
2314 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); | |
828c0950 AD |
2315 | static const struct file_operations version_fops = { |
2316 | .owner = THIS_MODULE, | |
1da177e4 | 2317 | .open = sg_proc_single_open_version, |
828c0950 AD |
2318 | .read = seq_read, |
2319 | .llseek = seq_lseek, | |
1da177e4 LT |
2320 | .release = single_release, |
2321 | }; | |
2322 | ||
2323 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); | |
2324 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); | |
828c0950 AD |
2325 | static const struct file_operations devhdr_fops = { |
2326 | .owner = THIS_MODULE, | |
1da177e4 | 2327 | .open = sg_proc_single_open_devhdr, |
828c0950 AD |
2328 | .read = seq_read, |
2329 | .llseek = seq_lseek, | |
1da177e4 LT |
2330 | .release = single_release, |
2331 | }; | |
2332 | ||
2333 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); | |
2334 | static int sg_proc_open_dev(struct inode *inode, struct file *file); | |
2335 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); | |
2336 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2337 | static void dev_seq_stop(struct seq_file *s, void *v); | |
828c0950 AD |
2338 | static const struct file_operations dev_fops = { |
2339 | .owner = THIS_MODULE, | |
1da177e4 | 2340 | .open = sg_proc_open_dev, |
828c0950 AD |
2341 | .read = seq_read, |
2342 | .llseek = seq_lseek, | |
1da177e4 LT |
2343 | .release = seq_release, |
2344 | }; | |
88e9d34c | 2345 | static const struct seq_operations dev_seq_ops = { |
1da177e4 LT |
2346 | .start = dev_seq_start, |
2347 | .next = dev_seq_next, | |
2348 | .stop = dev_seq_stop, | |
2349 | .show = sg_proc_seq_show_dev, | |
2350 | }; | |
2351 | ||
2352 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
2353 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); | |
828c0950 AD |
2354 | static const struct file_operations devstrs_fops = { |
2355 | .owner = THIS_MODULE, | |
1da177e4 | 2356 | .open = sg_proc_open_devstrs, |
828c0950 AD |
2357 | .read = seq_read, |
2358 | .llseek = seq_lseek, | |
1da177e4 LT |
2359 | .release = seq_release, |
2360 | }; | |
88e9d34c | 2361 | static const struct seq_operations devstrs_seq_ops = { |
1da177e4 LT |
2362 | .start = dev_seq_start, |
2363 | .next = dev_seq_next, | |
2364 | .stop = dev_seq_stop, | |
2365 | .show = sg_proc_seq_show_devstrs, | |
2366 | }; | |
2367 | ||
2368 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
2369 | static int sg_proc_open_debug(struct inode *inode, struct file *file); | |
828c0950 AD |
2370 | static const struct file_operations debug_fops = { |
2371 | .owner = THIS_MODULE, | |
1da177e4 | 2372 | .open = sg_proc_open_debug, |
828c0950 AD |
2373 | .read = seq_read, |
2374 | .llseek = seq_lseek, | |
1da177e4 LT |
2375 | .release = seq_release, |
2376 | }; | |
88e9d34c | 2377 | static const struct seq_operations debug_seq_ops = { |
1da177e4 LT |
2378 | .start = dev_seq_start, |
2379 | .next = dev_seq_next, | |
2380 | .stop = dev_seq_stop, | |
2381 | .show = sg_proc_seq_show_debug, | |
2382 | }; | |
2383 | ||
2384 | ||
2385 | struct sg_proc_leaf { | |
2386 | const char * name; | |
828c0950 | 2387 | const struct file_operations * fops; |
1da177e4 LT |
2388 | }; |
2389 | ||
18b8ba6c | 2390 | static const struct sg_proc_leaf sg_proc_leaf_arr[] = { |
1da177e4 LT |
2391 | {"allow_dio", &adio_fops}, |
2392 | {"debug", &debug_fops}, | |
2393 | {"def_reserved_size", &dressz_fops}, | |
2394 | {"device_hdr", &devhdr_fops}, | |
2395 | {"devices", &dev_fops}, | |
2396 | {"device_strs", &devstrs_fops}, | |
2397 | {"version", &version_fops} | |
2398 | }; | |
2399 | ||
2400 | static int | |
2401 | sg_proc_init(void) | |
2402 | { | |
6391a113 | 2403 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
d161a13f | 2404 | int k; |
1da177e4 | 2405 | |
66600221 | 2406 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
1da177e4 LT |
2407 | if (!sg_proc_sgp) |
2408 | return 1; | |
2409 | for (k = 0; k < num_leaves; ++k) { | |
18b8ba6c | 2410 | const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; |
d161a13f | 2411 | umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; |
a973909f | 2412 | proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); |
1da177e4 LT |
2413 | } |
2414 | return 0; | |
2415 | } | |
2416 | ||
2417 | static void | |
2418 | sg_proc_cleanup(void) | |
2419 | { | |
2420 | int k; | |
6391a113 | 2421 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
1da177e4 LT |
2422 | |
2423 | if (!sg_proc_sgp) | |
2424 | return; | |
2425 | for (k = 0; k < num_leaves; ++k) | |
2426 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); | |
2427 | remove_proc_entry(sg_proc_sg_dirname, NULL); | |
2428 | } | |
2429 | ||
2430 | ||
2431 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2432 | { | |
2433 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2434 | return 0; | |
2435 | } | |
2436 | ||
2437 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2438 | { | |
2439 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2440 | } | |
2441 | ||
2442 | static ssize_t | |
2443 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2444 | size_t count, loff_t *off) | |
2445 | { | |
7e95fffe SB |
2446 | int err; |
2447 | unsigned long num; | |
1da177e4 LT |
2448 | |
2449 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2450 | return -EACCES; | |
7e95fffe SB |
2451 | err = kstrtoul_from_user(buffer, count, 0, &num); |
2452 | if (err) | |
2453 | return err; | |
2454 | sg_allow_dio = num ? 1 : 0; | |
1da177e4 LT |
2455 | return count; |
2456 | } | |
2457 | ||
2458 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2459 | { | |
2460 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2461 | } | |
2462 | ||
2463 | static ssize_t | |
2464 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2465 | size_t count, loff_t *off) | |
2466 | { | |
7e95fffe | 2467 | int err; |
1da177e4 | 2468 | unsigned long k = ULONG_MAX; |
1da177e4 LT |
2469 | |
2470 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2471 | return -EACCES; | |
7e95fffe SB |
2472 | |
2473 | err = kstrtoul_from_user(buffer, count, 0, &k); | |
2474 | if (err) | |
2475 | return err; | |
1da177e4 LT |
2476 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ |
2477 | sg_big_buff = k; | |
2478 | return count; | |
2479 | } | |
2480 | return -ERANGE; | |
2481 | } | |
2482 | ||
2483 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2484 | { | |
2485 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2486 | sg_version_date); | |
2487 | return 0; | |
2488 | } | |
2489 | ||
2490 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) | |
2491 | { | |
2492 | return single_open(file, sg_proc_seq_show_version, NULL); | |
2493 | } | |
2494 | ||
2495 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) | |
2496 | { | |
cc833acb | 2497 | seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); |
1da177e4 LT |
2498 | return 0; |
2499 | } | |
2500 | ||
2501 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) | |
2502 | { | |
2503 | return single_open(file, sg_proc_seq_show_devhdr, NULL); | |
2504 | } | |
2505 | ||
2506 | struct sg_proc_deviter { | |
2507 | loff_t index; | |
2508 | size_t max; | |
2509 | }; | |
2510 | ||
2511 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2512 | { | |
2513 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2514 | ||
729d70f5 | 2515 | s->private = it; |
1da177e4 LT |
2516 | if (! it) |
2517 | return NULL; | |
729d70f5 | 2518 | |
1da177e4 LT |
2519 | it->index = *pos; |
2520 | it->max = sg_last_dev(); | |
2521 | if (it->index >= it->max) | |
729d70f5 | 2522 | return NULL; |
1da177e4 | 2523 | return it; |
1da177e4 LT |
2524 | } |
2525 | ||
2526 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2527 | { | |
729d70f5 | 2528 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2529 | |
2530 | *pos = ++it->index; | |
2531 | return (it->index < it->max) ? it : NULL; | |
2532 | } | |
2533 | ||
2534 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2535 | { | |
729d70f5 | 2536 | kfree(s->private); |
1da177e4 LT |
2537 | } |
2538 | ||
2539 | static int sg_proc_open_dev(struct inode *inode, struct file *file) | |
2540 | { | |
2541 | return seq_open(file, &dev_seq_ops); | |
2542 | } | |
2543 | ||
2544 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) | |
2545 | { | |
2546 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2547 | Sg_device *sdp; | |
2548 | struct scsi_device *scsidp; | |
c6517b79 | 2549 | unsigned long iflags; |
1da177e4 | 2550 | |
c6517b79 TB |
2551 | read_lock_irqsave(&sg_index_lock, iflags); |
2552 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
cc833acb DG |
2553 | if ((NULL == sdp) || (NULL == sdp->device) || |
2554 | (atomic_read(&sdp->detaching))) | |
2555 | seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
2556 | else { | |
2557 | scsidp = sdp->device; | |
9cb78c16 | 2558 | seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", |
1da177e4 LT |
2559 | scsidp->host->host_no, scsidp->channel, |
2560 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
2561 | 1, | |
2562 | (int) scsidp->queue_depth, | |
71e75c97 | 2563 | (int) atomic_read(&scsidp->device_busy), |
1da177e4 | 2564 | (int) scsi_device_online(scsidp)); |
cc833acb | 2565 | } |
c6517b79 | 2566 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2567 | return 0; |
2568 | } | |
2569 | ||
2570 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) | |
2571 | { | |
2572 | return seq_open(file, &devstrs_seq_ops); | |
2573 | } | |
2574 | ||
2575 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) | |
2576 | { | |
2577 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2578 | Sg_device *sdp; | |
2579 | struct scsi_device *scsidp; | |
c6517b79 | 2580 | unsigned long iflags; |
1da177e4 | 2581 | |
c6517b79 TB |
2582 | read_lock_irqsave(&sg_index_lock, iflags); |
2583 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
cc833acb DG |
2584 | scsidp = sdp ? sdp->device : NULL; |
2585 | if (sdp && scsidp && (!atomic_read(&sdp->detaching))) | |
1da177e4 LT |
2586 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", |
2587 | scsidp->vendor, scsidp->model, scsidp->rev); | |
2588 | else | |
cc833acb | 2589 | seq_puts(s, "<no active device>\n"); |
c6517b79 | 2590 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2591 | return 0; |
2592 | } | |
2593 | ||
c0d3b9c2 | 2594 | /* must be called while holding sg_index_lock */ |
1da177e4 LT |
2595 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) |
2596 | { | |
2597 | int k, m, new_interface, blen, usg; | |
2598 | Sg_request *srp; | |
2599 | Sg_fd *fp; | |
2600 | const sg_io_hdr_t *hp; | |
2601 | const char * cp; | |
cb59e840 | 2602 | unsigned int ms; |
1da177e4 | 2603 | |
3442f802 FT |
2604 | k = 0; |
2605 | list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { | |
2606 | k++; | |
c6517b79 | 2607 | read_lock(&fp->rq_list_lock); /* irqs already disabled */ |
1da177e4 | 2608 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " |
3442f802 | 2609 | "(res)sgat=%d low_dma=%d\n", k, |
1da177e4 LT |
2610 | jiffies_to_msecs(fp->timeout), |
2611 | fp->reserve.bufflen, | |
2612 | (int) fp->reserve.k_use_sg, | |
2613 | (int) fp->low_dma); | |
ebaf466b | 2614 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", |
1da177e4 | 2615 | (int) fp->cmd_q, (int) fp->force_packid, |
ebaf466b | 2616 | (int) fp->keep_orphan); |
c6517b79 TB |
2617 | for (m = 0, srp = fp->headrp; |
2618 | srp != NULL; | |
2619 | ++m, srp = srp->nextrp) { | |
1da177e4 LT |
2620 | hp = &srp->header; |
2621 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
2622 | if (srp->res_used) { | |
2623 | if (new_interface && | |
2624 | (SG_FLAG_MMAP_IO & hp->flags)) | |
2625 | cp = " mmap>> "; | |
2626 | else | |
2627 | cp = " rb>> "; | |
2628 | } else { | |
2629 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
2630 | cp = " dio>> "; | |
2631 | else | |
2632 | cp = " "; | |
2633 | } | |
cc833acb | 2634 | seq_puts(s, cp); |
d6b10348 MC |
2635 | blen = srp->data.bufflen; |
2636 | usg = srp->data.k_use_sg; | |
cc833acb DG |
2637 | seq_puts(s, srp->done ? |
2638 | ((1 == srp->done) ? "rcv:" : "fin:") | |
2639 | : "act:"); | |
1da177e4 LT |
2640 | seq_printf(s, " id=%d blen=%d", |
2641 | srp->header.pack_id, blen); | |
2642 | if (srp->done) | |
2643 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 | 2644 | else { |
2645 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 2646 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 | 2647 | (new_interface ? hp->timeout : |
2648 | jiffies_to_msecs(fp->timeout)), | |
2649 | (ms > hp->duration ? ms - hp->duration : 0)); | |
2650 | } | |
1da177e4 LT |
2651 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
2652 | (int) srp->data.cmd_opcode); | |
2653 | } | |
2654 | if (0 == m) | |
cc833acb | 2655 | seq_puts(s, " No requests active\n"); |
c6517b79 | 2656 | read_unlock(&fp->rq_list_lock); |
1da177e4 LT |
2657 | } |
2658 | } | |
2659 | ||
2660 | static int sg_proc_open_debug(struct inode *inode, struct file *file) | |
2661 | { | |
2662 | return seq_open(file, &debug_seq_ops); | |
2663 | } | |
2664 | ||
2665 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) | |
2666 | { | |
2667 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2668 | Sg_device *sdp; | |
c6517b79 | 2669 | unsigned long iflags; |
1da177e4 | 2670 | |
cc833acb DG |
2671 | if (it && (0 == it->index)) |
2672 | seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", | |
2673 | (int)it->max, sg_big_buff); | |
1da177e4 | 2674 | |
c6517b79 TB |
2675 | read_lock_irqsave(&sg_index_lock, iflags); |
2676 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
cc833acb DG |
2677 | if (NULL == sdp) |
2678 | goto skip; | |
2679 | read_lock(&sdp->sfd_lock); | |
2680 | if (!list_empty(&sdp->sfds)) { | |
c0d3b9c2 | 2681 | seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); |
cc833acb DG |
2682 | if (atomic_read(&sdp->detaching)) |
2683 | seq_puts(s, "detaching pending close "); | |
2684 | else if (sdp->device) { | |
2685 | struct scsi_device *scsidp = sdp->device; | |
2686 | ||
9cb78c16 | 2687 | seq_printf(s, "%d:%d:%d:%llu em=%d", |
cc833acb DG |
2688 | scsidp->host->host_no, |
2689 | scsidp->channel, scsidp->id, | |
2690 | scsidp->lun, | |
2691 | scsidp->host->hostt->emulated); | |
2692 | } | |
2693 | seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", | |
2694 | sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); | |
c0d3b9c2 | 2695 | sg_proc_debug_helper(s, sdp); |
1da177e4 | 2696 | } |
cc833acb DG |
2697 | read_unlock(&sdp->sfd_lock); |
2698 | skip: | |
c6517b79 | 2699 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2700 | return 0; |
2701 | } | |
2702 | ||
2703 | #endif /* CONFIG_SCSI_PROC_FS */ | |
2704 | ||
2705 | module_init(init_sg); | |
2706 | module_exit(exit_sg); |