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8d7c56d0 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * History: | |
4 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), | |
5 | * to allow user process control of SCSI devices. | |
6 | * Development Sponsored by Killy Corp. NY NY | |
7 | * | |
8 | * Original driver (sg.c): | |
9 | * Copyright (C) 1992 Lawrence Foard | |
10 | * Version 2 and 3 extensions to driver: | |
65c26a0f | 11 | * Copyright (C) 1998 - 2014 Douglas Gilbert |
1da177e4 LT |
12 | */ |
13 | ||
65c26a0f DG |
14 | static int sg_version_num = 30536; /* 2 digits for each component */ |
15 | #define SG_VERSION_STR "3.5.36" | |
1da177e4 LT |
16 | |
17 | /* | |
65c26a0f | 18 | * D. P. Gilbert (dgilbert@interlog.com), notes: |
1da177e4 LT |
19 | * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First |
20 | * the kernel/module needs to be built with CONFIG_SCSI_LOGGING | |
21 | * (otherwise the macros compile to empty statements). | |
22 | * | |
23 | */ | |
1da177e4 LT |
24 | #include <linux/module.h> |
25 | ||
26 | #include <linux/fs.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/sched.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/mtio.h> | |
33 | #include <linux/ioctl.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <linux/fcntl.h> |
36 | #include <linux/init.h> | |
37 | #include <linux/poll.h> | |
1da177e4 | 38 | #include <linux/moduleparam.h> |
1da177e4 | 39 | #include <linux/cdev.h> |
7c07d613 | 40 | #include <linux/idr.h> |
1da177e4 LT |
41 | #include <linux/seq_file.h> |
42 | #include <linux/blkdev.h> | |
43 | #include <linux/delay.h> | |
6da127ad | 44 | #include <linux/blktrace_api.h> |
c45d15d2 | 45 | #include <linux/mutex.h> |
cc833acb | 46 | #include <linux/atomic.h> |
2fe038e3 | 47 | #include <linux/ratelimit.h> |
e2e40f2c | 48 | #include <linux/uio.h> |
26b5b874 | 49 | #include <linux/cred.h> /* for sg_check_file_access() */ |
1da177e4 LT |
50 | |
51 | #include "scsi.h" | |
db9dff36 | 52 | #include <scsi/scsi_dbg.h> |
1da177e4 LT |
53 | #include <scsi/scsi_host.h> |
54 | #include <scsi/scsi_driver.h> | |
55 | #include <scsi/scsi_ioctl.h> | |
56 | #include <scsi/sg.h> | |
57 | ||
58 | #include "scsi_logging.h" | |
59 | ||
60 | #ifdef CONFIG_SCSI_PROC_FS | |
61 | #include <linux/proc_fs.h> | |
65c26a0f | 62 | static char *sg_version_date = "20140603"; |
1da177e4 LT |
63 | |
64 | static int sg_proc_init(void); | |
1da177e4 LT |
65 | #endif |
66 | ||
1da177e4 | 67 | #define SG_ALLOW_DIO_DEF 0 |
1da177e4 LT |
68 | |
69 | #define SG_MAX_DEVS 32768 | |
70 | ||
65c26a0f DG |
71 | /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type |
72 | * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater | |
73 | * than 16 bytes are "variable length" whose length is a multiple of 4 | |
74 | */ | |
75 | #define SG_MAX_CDB_SIZE 252 | |
76 | ||
f8630bd7 | 77 | #define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) |
1da177e4 LT |
78 | |
79 | int sg_big_buff = SG_DEF_RESERVED_SIZE; | |
80 | /* N.B. This variable is readable and writeable via | |
81 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer | |
82 | of this size (or less if there is not enough memory) will be reserved | |
83 | for use by this file descriptor. [Deprecated usage: this variable is also | |
84 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into | |
85 | the kernel (i.e. it is not a module).] */ | |
86 | static int def_reserved_size = -1; /* picks up init parameter */ | |
87 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; | |
88 | ||
6460e75a DG |
89 | static int scatter_elem_sz = SG_SCATTER_SZ; |
90 | static int scatter_elem_sz_prev = SG_SCATTER_SZ; | |
91 | ||
1da177e4 | 92 | #define SG_SECTOR_SZ 512 |
1da177e4 | 93 | |
cc833acb DG |
94 | static int sg_add_device(struct device *, struct class_interface *); |
95 | static void sg_remove_device(struct device *, struct class_interface *); | |
98481ff0 | 96 | |
7c07d613 | 97 | static DEFINE_IDR(sg_index_idr); |
c0d3b9c2 JB |
98 | static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock |
99 | file descriptor list for device */ | |
1da177e4 LT |
100 | |
101 | static struct class_interface sg_interface = { | |
cc833acb DG |
102 | .add_dev = sg_add_device, |
103 | .remove_dev = sg_remove_device, | |
1da177e4 LT |
104 | }; |
105 | ||
106 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
107 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
ea312552 | 108 | unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ |
1da177e4 | 109 | unsigned bufflen; /* Size of (aggregate) data buffer */ |
10db10d1 FT |
110 | struct page **pages; |
111 | int page_order; | |
1da177e4 LT |
112 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
113 | unsigned char cmd_opcode; /* first byte of command */ | |
114 | } Sg_scatter_hold; | |
115 | ||
116 | struct sg_device; /* forward declarations */ | |
117 | struct sg_fd; | |
118 | ||
119 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
109bade9 | 120 | struct list_head entry; /* list entry */ |
1da177e4 LT |
121 | struct sg_fd *parentfp; /* NULL -> not in use */ |
122 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
123 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
d6b10348 | 124 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
1da177e4 LT |
125 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
126 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
127 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
6acddc5e JE |
128 | /* done protected by rq_list_lock */ |
129 | char done; /* 0->before bh, 1->before read, 2->read */ | |
10865dfa | 130 | struct request *rq; |
6e5a30cb | 131 | struct bio *bio; |
c96952ed | 132 | struct execute_work ew; |
1da177e4 LT |
133 | } Sg_request; |
134 | ||
135 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
cc833acb | 136 | struct list_head sfd_siblings; /* protected by device's sfd_lock */ |
1da177e4 LT |
137 | struct sg_device *parentdp; /* owning device */ |
138 | wait_queue_head_t read_wait; /* queue read until command done */ | |
139 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
1bc0eb04 | 140 | struct mutex f_mutex; /* protect against changes in this fd */ |
1da177e4 LT |
141 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ |
142 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
143 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
109bade9 | 144 | struct list_head rq_list; /* head of request list */ |
1da177e4 LT |
145 | struct fasync_struct *async_qp; /* used by asynchronous notification */ |
146 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
1da177e4 | 147 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ |
1da177e4 | 148 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ |
65c26a0f | 149 | unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ |
1da177e4 LT |
150 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ |
151 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
1bc0eb04 | 152 | char res_in_use; /* 1 -> 'reserve' array in use */ |
c6517b79 TB |
153 | struct kref f_ref; |
154 | struct execute_work ew; | |
1da177e4 LT |
155 | } Sg_fd; |
156 | ||
157 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
158 | struct scsi_device *device; | |
cc833acb DG |
159 | wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ |
160 | struct mutex open_rel_lock; /* held when in open() or release() */ | |
1da177e4 | 161 | int sg_tablesize; /* adapter's max scatter-gather table size */ |
7c07d613 | 162 | u32 index; /* device index number */ |
3442f802 | 163 | struct list_head sfds; |
cc833acb DG |
164 | rwlock_t sfd_lock; /* protect access to sfd list */ |
165 | atomic_t detaching; /* 0->device usable, 1->device detaching */ | |
166 | bool exclude; /* 1->open(O_EXCL) succeeded and is active */ | |
167 | int open_cnt; /* count of opens (perhaps < num(sfds) ) */ | |
1da177e4 LT |
168 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ |
169 | struct gendisk *disk; | |
170 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ | |
c6517b79 | 171 | struct kref d_ref; |
1da177e4 LT |
172 | } Sg_device; |
173 | ||
d6b10348 | 174 | /* tasklet or soft irq callback */ |
2a842aca | 175 | static void sg_rq_end_io(struct request *rq, blk_status_t status); |
10865dfa | 176 | static int sg_start_req(Sg_request *srp, unsigned char *cmd); |
e7ee4cc0 | 177 | static int sg_finish_rem_req(Sg_request * srp); |
1da177e4 | 178 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); |
1da177e4 LT |
179 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, |
180 | Sg_request * srp); | |
0b07de85 AG |
181 | static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, |
182 | const char __user *buf, size_t count, int blocking, | |
a2dd3b4c | 183 | int read_only, int sg_io_owned, Sg_request **o_srp); |
1da177e4 LT |
184 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, |
185 | unsigned char *cmnd, int timeout, int blocking); | |
1da177e4 | 186 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); |
95e159d6 | 187 | static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp); |
1da177e4 LT |
188 | static void sg_build_reserve(Sg_fd * sfp, int req_size); |
189 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); | |
190 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); | |
95e159d6 | 191 | static Sg_fd *sg_add_sfp(Sg_device * sdp); |
c6517b79 | 192 | static void sg_remove_sfp(struct kref *); |
1da177e4 LT |
193 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); |
194 | static Sg_request *sg_add_request(Sg_fd * sfp); | |
195 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); | |
1da177e4 | 196 | static Sg_device *sg_get_dev(int dev); |
cc833acb | 197 | static void sg_device_destroy(struct kref *kref); |
1da177e4 | 198 | |
1da177e4 LT |
199 | #define SZ_SG_HEADER sizeof(struct sg_header) |
200 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
201 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
202 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
203 | ||
95e159d6 | 204 | #define sg_printk(prefix, sdp, fmt, a...) \ |
22e0d994 HR |
205 | sdev_prefix_printk(prefix, (sdp)->device, \ |
206 | (sdp)->disk->disk_name, fmt, ##a) | |
95e159d6 | 207 | |
26b5b874 JH |
208 | /* |
209 | * The SCSI interfaces that use read() and write() as an asynchronous variant of | |
210 | * ioctl(..., SG_IO, ...) are fundamentally unsafe, since there are lots of ways | |
211 | * to trigger read() and write() calls from various contexts with elevated | |
212 | * privileges. This can lead to kernel memory corruption (e.g. if these | |
213 | * interfaces are called through splice()) and privilege escalation inside | |
214 | * userspace (e.g. if a process with access to such a device passes a file | |
215 | * descriptor to a SUID binary as stdin/stdout/stderr). | |
216 | * | |
217 | * This function provides protection for the legacy API by restricting the | |
218 | * calling context. | |
219 | */ | |
220 | static int sg_check_file_access(struct file *filp, const char *caller) | |
221 | { | |
222 | if (filp->f_cred != current_real_cred()) { | |
223 | pr_err_once("%s: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", | |
224 | caller, task_tgid_vnr(current), current->comm); | |
225 | return -EPERM; | |
226 | } | |
227 | if (uaccess_kernel()) { | |
228 | pr_err_once("%s: process %d (%s) called from kernel context, this is not allowed.\n", | |
229 | caller, task_tgid_vnr(current), current->comm); | |
230 | return -EACCES; | |
231 | } | |
232 | return 0; | |
233 | } | |
234 | ||
14e507b8 FT |
235 | static int sg_allow_access(struct file *filp, unsigned char *cmd) |
236 | { | |
35df8397 | 237 | struct sg_fd *sfp = filp->private_data; |
14e507b8 FT |
238 | |
239 | if (sfp->parentdp->device->type == TYPE_SCANNER) | |
240 | return 0; | |
241 | ||
f00c4d80 | 242 | return blk_verify_command(cmd, filp->f_mode); |
14e507b8 FT |
243 | } |
244 | ||
cc833acb DG |
245 | static int |
246 | open_wait(Sg_device *sdp, int flags) | |
98481ff0 | 247 | { |
cc833acb | 248 | int retval = 0; |
98481ff0 | 249 | |
cc833acb DG |
250 | if (flags & O_EXCL) { |
251 | while (sdp->open_cnt > 0) { | |
252 | mutex_unlock(&sdp->open_rel_lock); | |
253 | retval = wait_event_interruptible(sdp->open_wait, | |
254 | (atomic_read(&sdp->detaching) || | |
255 | !sdp->open_cnt)); | |
256 | mutex_lock(&sdp->open_rel_lock); | |
257 | ||
258 | if (retval) /* -ERESTARTSYS */ | |
259 | return retval; | |
260 | if (atomic_read(&sdp->detaching)) | |
261 | return -ENODEV; | |
262 | } | |
263 | } else { | |
264 | while (sdp->exclude) { | |
265 | mutex_unlock(&sdp->open_rel_lock); | |
266 | retval = wait_event_interruptible(sdp->open_wait, | |
267 | (atomic_read(&sdp->detaching) || | |
268 | !sdp->exclude)); | |
269 | mutex_lock(&sdp->open_rel_lock); | |
270 | ||
271 | if (retval) /* -ERESTARTSYS */ | |
272 | return retval; | |
273 | if (atomic_read(&sdp->detaching)) | |
274 | return -ENODEV; | |
275 | } | |
276 | } | |
035d12e6 | 277 | |
cc833acb | 278 | return retval; |
035d12e6 JE |
279 | } |
280 | ||
cc833acb | 281 | /* Returns 0 on success, else a negated errno value */ |
1da177e4 LT |
282 | static int |
283 | sg_open(struct inode *inode, struct file *filp) | |
284 | { | |
285 | int dev = iminor(inode); | |
286 | int flags = filp->f_flags; | |
d6b10348 | 287 | struct request_queue *q; |
1da177e4 LT |
288 | Sg_device *sdp; |
289 | Sg_fd *sfp; | |
1da177e4 LT |
290 | int retval; |
291 | ||
292 | nonseekable_open(inode, filp); | |
cc833acb DG |
293 | if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) |
294 | return -EPERM; /* Can't lock it with read only access */ | |
1da177e4 | 295 | sdp = sg_get_dev(dev); |
cc833acb DG |
296 | if (IS_ERR(sdp)) |
297 | return PTR_ERR(sdp); | |
1da177e4 | 298 | |
95e159d6 HR |
299 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
300 | "sg_open: flags=0x%x\n", flags)); | |
301 | ||
1da177e4 LT |
302 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ |
303 | /* Prevent the device driver from vanishing while we sleep */ | |
304 | retval = scsi_device_get(sdp->device); | |
c6517b79 TB |
305 | if (retval) |
306 | goto sg_put; | |
1da177e4 | 307 | |
bc4f2401 AS |
308 | retval = scsi_autopm_get_device(sdp->device); |
309 | if (retval) | |
310 | goto sdp_put; | |
311 | ||
cc833acb DG |
312 | /* scsi_block_when_processing_errors() may block so bypass |
313 | * check if O_NONBLOCK. Permits SCSI commands to be issued | |
314 | * during error recovery. Tread carefully. */ | |
1da177e4 LT |
315 | if (!((flags & O_NONBLOCK) || |
316 | scsi_block_when_processing_errors(sdp->device))) { | |
317 | retval = -ENXIO; | |
318 | /* we are in error recovery for this device */ | |
319 | goto error_out; | |
320 | } | |
321 | ||
cc833acb DG |
322 | mutex_lock(&sdp->open_rel_lock); |
323 | if (flags & O_NONBLOCK) { | |
324 | if (flags & O_EXCL) { | |
325 | if (sdp->open_cnt > 0) { | |
326 | retval = -EBUSY; | |
327 | goto error_mutex_locked; | |
328 | } | |
329 | } else { | |
330 | if (sdp->exclude) { | |
331 | retval = -EBUSY; | |
332 | goto error_mutex_locked; | |
333 | } | |
1da177e4 | 334 | } |
cc833acb DG |
335 | } else { |
336 | retval = open_wait(sdp, flags); | |
337 | if (retval) /* -ERESTARTSYS or -ENODEV */ | |
338 | goto error_mutex_locked; | |
1da177e4 | 339 | } |
cc833acb DG |
340 | |
341 | /* N.B. at this point we are holding the open_rel_lock */ | |
342 | if (flags & O_EXCL) | |
343 | sdp->exclude = true; | |
344 | ||
345 | if (sdp->open_cnt < 1) { /* no existing opens */ | |
1da177e4 | 346 | sdp->sgdebug = 0; |
d6b10348 | 347 | q = sdp->device->request_queue; |
8a78362c | 348 | sdp->sg_tablesize = queue_max_segments(q); |
1da177e4 | 349 | } |
95e159d6 | 350 | sfp = sg_add_sfp(sdp); |
cc833acb DG |
351 | if (IS_ERR(sfp)) { |
352 | retval = PTR_ERR(sfp); | |
353 | goto out_undo; | |
065b4a2f | 354 | } |
cc833acb DG |
355 | |
356 | filp->private_data = sfp; | |
357 | sdp->open_cnt++; | |
358 | mutex_unlock(&sdp->open_rel_lock); | |
359 | ||
065b4a2f | 360 | retval = 0; |
c6517b79 | 361 | sg_put: |
cc833acb | 362 | kref_put(&sdp->d_ref, sg_device_destroy); |
1da177e4 | 363 | return retval; |
cc833acb DG |
364 | |
365 | out_undo: | |
366 | if (flags & O_EXCL) { | |
367 | sdp->exclude = false; /* undo if error */ | |
368 | wake_up_interruptible(&sdp->open_wait); | |
369 | } | |
370 | error_mutex_locked: | |
371 | mutex_unlock(&sdp->open_rel_lock); | |
372 | error_out: | |
373 | scsi_autopm_put_device(sdp->device); | |
374 | sdp_put: | |
375 | scsi_device_put(sdp->device); | |
376 | goto sg_put; | |
1da177e4 LT |
377 | } |
378 | ||
cc833acb DG |
379 | /* Release resources associated with a successful sg_open() |
380 | * Returns 0 on success, else a negated errno value */ | |
1da177e4 LT |
381 | static int |
382 | sg_release(struct inode *inode, struct file *filp) | |
383 | { | |
384 | Sg_device *sdp; | |
385 | Sg_fd *sfp; | |
386 | ||
387 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
388 | return -ENXIO; | |
95e159d6 | 389 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n")); |
c6517b79 | 390 | |
cc833acb | 391 | mutex_lock(&sdp->open_rel_lock); |
bc4f2401 | 392 | scsi_autopm_put_device(sdp->device); |
c6517b79 | 393 | kref_put(&sfp->f_ref, sg_remove_sfp); |
cc833acb DG |
394 | sdp->open_cnt--; |
395 | ||
396 | /* possibly many open()s waiting on exlude clearing, start many; | |
397 | * only open(O_EXCL)s wait on 0==open_cnt so only start one */ | |
398 | if (sdp->exclude) { | |
399 | sdp->exclude = false; | |
400 | wake_up_interruptible_all(&sdp->open_wait); | |
401 | } else if (0 == sdp->open_cnt) { | |
402 | wake_up_interruptible(&sdp->open_wait); | |
403 | } | |
404 | mutex_unlock(&sdp->open_rel_lock); | |
1da177e4 LT |
405 | return 0; |
406 | } | |
407 | ||
78ed001d AB |
408 | static int get_sg_io_pack_id(int *pack_id, void __user *buf, size_t count) |
409 | { | |
410 | struct sg_header __user *old_hdr = buf; | |
411 | int reply_len; | |
412 | ||
413 | if (count >= SZ_SG_HEADER) { | |
414 | /* negative reply_len means v3 format, otherwise v1/v2 */ | |
415 | if (get_user(reply_len, &old_hdr->reply_len)) | |
416 | return -EFAULT; | |
417 | ||
418 | if (reply_len >= 0) | |
419 | return get_user(*pack_id, &old_hdr->pack_id); | |
420 | ||
421 | if (in_compat_syscall() && | |
422 | count >= sizeof(struct compat_sg_io_hdr)) { | |
423 | struct compat_sg_io_hdr __user *hp = buf; | |
424 | ||
425 | return get_user(*pack_id, &hp->pack_id); | |
426 | } | |
427 | ||
428 | if (count >= sizeof(struct sg_io_hdr)) { | |
429 | struct sg_io_hdr __user *hp = buf; | |
430 | ||
431 | return get_user(*pack_id, &hp->pack_id); | |
432 | } | |
433 | } | |
434 | ||
435 | /* no valid header was passed, so ignore the pack_id */ | |
436 | *pack_id = -1; | |
437 | return 0; | |
438 | } | |
439 | ||
1da177e4 LT |
440 | static ssize_t |
441 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
442 | { | |
1da177e4 LT |
443 | Sg_device *sdp; |
444 | Sg_fd *sfp; | |
445 | Sg_request *srp; | |
446 | int req_pack_id = -1; | |
1da177e4 | 447 | sg_io_hdr_t *hp; |
78ed001d AB |
448 | struct sg_header *old_hdr; |
449 | int retval; | |
1da177e4 | 450 | |
26b5b874 JH |
451 | /* |
452 | * This could cause a response to be stranded. Close the associated | |
453 | * file descriptor to free up any resources being held. | |
454 | */ | |
455 | retval = sg_check_file_access(filp, __func__); | |
456 | if (retval) | |
457 | return retval; | |
458 | ||
1da177e4 LT |
459 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
460 | return -ENXIO; | |
95e159d6 HR |
461 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
462 | "sg_read: count=%d\n", (int) count)); | |
d6b10348 | 463 | |
78ed001d AB |
464 | if (sfp->force_packid) |
465 | retval = get_sg_io_pack_id(&req_pack_id, buf, count); | |
466 | if (retval) | |
467 | return retval; | |
468 | ||
1da177e4 LT |
469 | srp = sg_get_rq_mark(sfp, req_pack_id); |
470 | if (!srp) { /* now wait on packet to arrive */ | |
78ed001d AB |
471 | if (atomic_read(&sdp->detaching)) |
472 | return -ENODEV; | |
473 | if (filp->f_flags & O_NONBLOCK) | |
474 | return -EAGAIN; | |
3f0c6aba | 475 | retval = wait_event_interruptible(sfp->read_wait, |
cc833acb | 476 | (atomic_read(&sdp->detaching) || |
3f0c6aba | 477 | (srp = sg_get_rq_mark(sfp, req_pack_id)))); |
78ed001d AB |
478 | if (atomic_read(&sdp->detaching)) |
479 | return -ENODEV; | |
480 | if (retval) | |
cb59e840 | 481 | /* -ERESTARTSYS as signal hit process */ |
78ed001d | 482 | return retval; |
cb59e840 | 483 | } |
78ed001d AB |
484 | if (srp->header.interface_id != '\0') |
485 | return sg_new_read(sfp, buf, count, srp); | |
1da177e4 LT |
486 | |
487 | hp = &srp->header; | |
78ed001d AB |
488 | old_hdr = kzalloc(SZ_SG_HEADER, GFP_KERNEL); |
489 | if (!old_hdr) | |
490 | return -ENOMEM; | |
491 | ||
cb59e840 DG |
492 | old_hdr->reply_len = (int) hp->timeout; |
493 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
494 | old_hdr->pack_id = hp->pack_id; | |
495 | old_hdr->twelve_byte = | |
1da177e4 | 496 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 DG |
497 | old_hdr->target_status = hp->masked_status; |
498 | old_hdr->host_status = hp->host_status; | |
499 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 LT |
500 | if ((CHECK_CONDITION & hp->masked_status) || |
501 | (DRIVER_SENSE & hp->driver_status)) | |
cb59e840 DG |
502 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
503 | sizeof (old_hdr->sense_buffer)); | |
1da177e4 LT |
504 | switch (hp->host_status) { |
505 | /* This setup of 'result' is for backward compatibility and is best | |
506 | ignored by the user who should use target, host + driver status */ | |
507 | case DID_OK: | |
508 | case DID_PASSTHROUGH: | |
509 | case DID_SOFT_ERROR: | |
cb59e840 | 510 | old_hdr->result = 0; |
1da177e4 LT |
511 | break; |
512 | case DID_NO_CONNECT: | |
513 | case DID_BUS_BUSY: | |
514 | case DID_TIME_OUT: | |
cb59e840 | 515 | old_hdr->result = EBUSY; |
1da177e4 LT |
516 | break; |
517 | case DID_BAD_TARGET: | |
518 | case DID_ABORT: | |
519 | case DID_PARITY: | |
520 | case DID_RESET: | |
521 | case DID_BAD_INTR: | |
cb59e840 | 522 | old_hdr->result = EIO; |
1da177e4 LT |
523 | break; |
524 | case DID_ERROR: | |
cb59e840 | 525 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
526 | hp->masked_status == GOOD) ? 0 : EIO; |
527 | break; | |
528 | default: | |
cb59e840 | 529 | old_hdr->result = EIO; |
1da177e4 LT |
530 | break; |
531 | } | |
532 | ||
533 | /* Now copy the result back to the user buffer. */ | |
534 | if (count >= SZ_SG_HEADER) { | |
c8c12792 | 535 | if (copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
cb59e840 DG |
536 | retval = -EFAULT; |
537 | goto free_old_hdr; | |
538 | } | |
1da177e4 | 539 | buf += SZ_SG_HEADER; |
cb59e840 DG |
540 | if (count > old_hdr->reply_len) |
541 | count = old_hdr->reply_len; | |
1da177e4 | 542 | if (count > SZ_SG_HEADER) { |
cb59e840 DG |
543 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
544 | retval = -EFAULT; | |
545 | goto free_old_hdr; | |
546 | } | |
1da177e4 LT |
547 | } |
548 | } else | |
cb59e840 | 549 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 550 | sg_finish_rem_req(srp); |
97d27b0d | 551 | sg_remove_request(sfp, srp); |
cb59e840 DG |
552 | retval = count; |
553 | free_old_hdr: | |
c9475cb0 | 554 | kfree(old_hdr); |
cb59e840 | 555 | return retval; |
1da177e4 LT |
556 | } |
557 | ||
558 | static ssize_t | |
559 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
560 | { | |
561 | sg_io_hdr_t *hp = &srp->header; | |
3b524a68 | 562 | int err = 0, err2; |
1da177e4 LT |
563 | int len; |
564 | ||
78ed001d AB |
565 | if (in_compat_syscall()) { |
566 | if (count < sizeof(struct compat_sg_io_hdr)) { | |
567 | err = -EINVAL; | |
568 | goto err_out; | |
569 | } | |
570 | } else if (count < SZ_SG_IO_HDR) { | |
1da177e4 LT |
571 | err = -EINVAL; |
572 | goto err_out; | |
573 | } | |
574 | hp->sb_len_wr = 0; | |
575 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
576 | if ((CHECK_CONDITION & hp->masked_status) || | |
577 | (DRIVER_SENSE & hp->driver_status)) { | |
d6b10348 | 578 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
1da177e4 LT |
579 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
580 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
581 | len = (len > sb_len) ? sb_len : len; | |
582 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
583 | err = -EFAULT; | |
584 | goto err_out; | |
585 | } | |
586 | hp->sb_len_wr = len; | |
587 | } | |
588 | } | |
589 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
590 | hp->info |= SG_INFO_CHECK; | |
98aaaec4 | 591 | err = put_sg_io_hdr(hp, buf); |
0b6cb26c | 592 | err_out: |
3b524a68 | 593 | err2 = sg_finish_rem_req(srp); |
97d27b0d | 594 | sg_remove_request(sfp, srp); |
3b524a68 | 595 | return err ? : err2 ? : count; |
1da177e4 LT |
596 | } |
597 | ||
598 | static ssize_t | |
599 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
600 | { | |
601 | int mxsize, cmd_size, k; | |
602 | int input_size, blocking; | |
603 | unsigned char opcode; | |
604 | Sg_device *sdp; | |
605 | Sg_fd *sfp; | |
606 | Sg_request *srp; | |
607 | struct sg_header old_hdr; | |
608 | sg_io_hdr_t *hp; | |
65c26a0f | 609 | unsigned char cmnd[SG_MAX_CDB_SIZE]; |
26b5b874 | 610 | int retval; |
1da177e4 | 611 | |
26b5b874 JH |
612 | retval = sg_check_file_access(filp, __func__); |
613 | if (retval) | |
614 | return retval; | |
128394ef | 615 | |
1da177e4 LT |
616 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
617 | return -ENXIO; | |
95e159d6 HR |
618 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
619 | "sg_write: count=%d\n", (int) count)); | |
cc833acb | 620 | if (atomic_read(&sdp->detaching)) |
1da177e4 LT |
621 | return -ENODEV; |
622 | if (!((filp->f_flags & O_NONBLOCK) || | |
623 | scsi_block_when_processing_errors(sdp->device))) | |
624 | return -ENXIO; | |
625 | ||
1da177e4 LT |
626 | if (count < SZ_SG_HEADER) |
627 | return -EIO; | |
a64e5a86 | 628 | if (copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) |
1da177e4 LT |
629 | return -EFAULT; |
630 | blocking = !(filp->f_flags & O_NONBLOCK); | |
631 | if (old_hdr.reply_len < 0) | |
a2dd3b4c TB |
632 | return sg_new_write(sfp, filp, buf, count, |
633 | blocking, 0, 0, NULL); | |
1da177e4 LT |
634 | if (count < (SZ_SG_HEADER + 6)) |
635 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
636 | ||
062c9d45 | 637 | buf += SZ_SG_HEADER; |
a64e5a86 | 638 | if (get_user(opcode, buf)) |
062c9d45 AV |
639 | return -EFAULT; |
640 | ||
1da177e4 | 641 | if (!(srp = sg_add_request(sfp))) { |
95e159d6 HR |
642 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp, |
643 | "sg_write: queue full\n")); | |
1da177e4 LT |
644 | return -EDOM; |
645 | } | |
1bc0eb04 | 646 | mutex_lock(&sfp->f_mutex); |
1da177e4 | 647 | if (sfp->next_cmd_len > 0) { |
1da177e4 LT |
648 | cmd_size = sfp->next_cmd_len; |
649 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
650 | } else { | |
651 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
652 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
653 | cmd_size = 12; | |
654 | } | |
1bc0eb04 | 655 | mutex_unlock(&sfp->f_mutex); |
95e159d6 | 656 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
1da177e4 LT |
657 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); |
658 | /* Determine buffer size. */ | |
659 | input_size = count - cmd_size; | |
660 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
661 | mxsize -= SZ_SG_HEADER; | |
662 | input_size -= SZ_SG_HEADER; | |
663 | if (input_size < 0) { | |
664 | sg_remove_request(sfp, srp); | |
665 | return -EIO; /* User did not pass enough bytes for this command. */ | |
666 | } | |
667 | hp = &srp->header; | |
668 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
669 | hp->cmd_len = (unsigned char) cmd_size; | |
670 | hp->iovec_count = 0; | |
671 | hp->mx_sb_len = 0; | |
672 | if (input_size > 0) | |
673 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
674 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
675 | else | |
676 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
677 | hp->dxfer_len = mxsize; | |
5ecee0a3 DG |
678 | if ((hp->dxfer_direction == SG_DXFER_TO_DEV) || |
679 | (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)) | |
fad7f01e FT |
680 | hp->dxferp = (char __user *)buf + cmd_size; |
681 | else | |
682 | hp->dxferp = NULL; | |
1da177e4 LT |
683 | hp->sbp = NULL; |
684 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
685 | hp->flags = input_size; /* structure abuse ... */ | |
686 | hp->pack_id = old_hdr.pack_id; | |
687 | hp->usr_ptr = NULL; | |
a64e5a86 | 688 | if (copy_from_user(cmnd, buf, cmd_size)) |
1da177e4 LT |
689 | return -EFAULT; |
690 | /* | |
691 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
692 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
693 | * is a non-zero input_size, so emit a warning. | |
694 | */ | |
eaa3e22e | 695 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
28676d86 JT |
696 | printk_ratelimited(KERN_WARNING |
697 | "sg_write: data in/out %d/%d bytes " | |
698 | "for SCSI command 0x%x-- guessing " | |
699 | "data in;\n program %s not setting " | |
700 | "count and/or reply_len properly\n", | |
701 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
702 | input_size, (unsigned int) cmnd[0], | |
703 | current->comm); | |
eaa3e22e | 704 | } |
1da177e4 LT |
705 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
706 | return (k < 0) ? k : count; | |
707 | } | |
708 | ||
709 | static ssize_t | |
0b07de85 | 710 | sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, |
a2dd3b4c | 711 | size_t count, int blocking, int read_only, int sg_io_owned, |
0b07de85 | 712 | Sg_request **o_srp) |
1da177e4 LT |
713 | { |
714 | int k; | |
715 | Sg_request *srp; | |
716 | sg_io_hdr_t *hp; | |
65c26a0f | 717 | unsigned char cmnd[SG_MAX_CDB_SIZE]; |
1da177e4 LT |
718 | int timeout; |
719 | unsigned long ul_timeout; | |
720 | ||
721 | if (count < SZ_SG_IO_HDR) | |
722 | return -EINVAL; | |
1da177e4 LT |
723 | |
724 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
725 | if (!(srp = sg_add_request(sfp))) { | |
95e159d6 HR |
726 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
727 | "sg_new_write: queue full\n")); | |
1da177e4 LT |
728 | return -EDOM; |
729 | } | |
a2dd3b4c | 730 | srp->sg_io_owned = sg_io_owned; |
1da177e4 | 731 | hp = &srp->header; |
98aaaec4 | 732 | if (get_sg_io_hdr(hp, buf)) { |
1da177e4 LT |
733 | sg_remove_request(sfp, srp); |
734 | return -EFAULT; | |
735 | } | |
736 | if (hp->interface_id != 'S') { | |
737 | sg_remove_request(sfp, srp); | |
738 | return -ENOSYS; | |
739 | } | |
740 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
741 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
742 | sg_remove_request(sfp, srp); | |
743 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
744 | } | |
745 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
746 | sg_remove_request(sfp, srp); | |
747 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
748 | } | |
1bc0eb04 | 749 | if (sfp->res_in_use) { |
1da177e4 LT |
750 | sg_remove_request(sfp, srp); |
751 | return -EBUSY; /* reserve buffer already being used */ | |
752 | } | |
753 | } | |
754 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
755 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
756 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
757 | sg_remove_request(sfp, srp); | |
758 | return -EMSGSIZE; | |
759 | } | |
a62726cb | 760 | if (copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { |
1da177e4 LT |
761 | sg_remove_request(sfp, srp); |
762 | return -EFAULT; | |
763 | } | |
14e507b8 | 764 | if (read_only && sg_allow_access(file, cmnd)) { |
1da177e4 LT |
765 | sg_remove_request(sfp, srp); |
766 | return -EPERM; | |
767 | } | |
768 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
769 | if (k < 0) | |
770 | return k; | |
771 | if (o_srp) | |
772 | *o_srp = srp; | |
773 | return count; | |
774 | } | |
775 | ||
776 | static int | |
777 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
778 | unsigned char *cmnd, int timeout, int blocking) | |
779 | { | |
5af2e382 | 780 | int k, at_head; |
1da177e4 LT |
781 | Sg_device *sdp = sfp->parentdp; |
782 | sg_io_hdr_t *hp = &srp->header; | |
1da177e4 LT |
783 | |
784 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
785 | hp->status = 0; | |
786 | hp->masked_status = 0; | |
787 | hp->msg_status = 0; | |
788 | hp->info = 0; | |
789 | hp->host_status = 0; | |
790 | hp->driver_status = 0; | |
791 | hp->resid = 0; | |
95e159d6 HR |
792 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
793 | "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
794 | (int) cmnd[0], (int) hp->cmd_len)); | |
1da177e4 | 795 | |
f930c704 | 796 | if (hp->dxfer_len >= SZ_256M) |
28676d86 JT |
797 | return -EINVAL; |
798 | ||
10865dfa FT |
799 | k = sg_start_req(srp, cmnd); |
800 | if (k) { | |
95e159d6 HR |
801 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
802 | "sg_common_write: start_req err=%d\n", k)); | |
1da177e4 | 803 | sg_finish_rem_req(srp); |
97d27b0d | 804 | sg_remove_request(sfp, srp); |
1da177e4 LT |
805 | return k; /* probably out of space --> ENOMEM */ |
806 | } | |
cc833acb | 807 | if (atomic_read(&sdp->detaching)) { |
f3951a37 | 808 | if (srp->bio) { |
82ed4db4 | 809 | scsi_req_free_cmd(scsi_req(srp->rq)); |
abaf75dd | 810 | blk_put_request(srp->rq); |
f3951a37 CO |
811 | srp->rq = NULL; |
812 | } | |
813 | ||
1da177e4 | 814 | sg_finish_rem_req(srp); |
97d27b0d | 815 | sg_remove_request(sfp, srp); |
1da177e4 LT |
816 | return -ENODEV; |
817 | } | |
1da177e4 | 818 | |
cb59e840 | 819 | hp->duration = jiffies_to_msecs(jiffies); |
16070cc1 DG |
820 | if (hp->interface_id != '\0' && /* v3 (or later) interface */ |
821 | (SG_FLAG_Q_AT_TAIL & hp->flags)) | |
822 | at_head = 0; | |
823 | else | |
824 | at_head = 1; | |
10db10d1 FT |
825 | |
826 | srp->rq->timeout = timeout; | |
c6517b79 | 827 | kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ |
10db10d1 | 828 | blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, |
16070cc1 | 829 | srp->rq, at_head, sg_rq_end_io); |
10db10d1 | 830 | return 0; |
1da177e4 LT |
831 | } |
832 | ||
6acddc5e JE |
833 | static int srp_done(Sg_fd *sfp, Sg_request *srp) |
834 | { | |
835 | unsigned long flags; | |
836 | int ret; | |
837 | ||
838 | read_lock_irqsave(&sfp->rq_list_lock, flags); | |
839 | ret = srp->done; | |
840 | read_unlock_irqrestore(&sfp->rq_list_lock, flags); | |
841 | return ret; | |
842 | } | |
843 | ||
46f69e6a AM |
844 | static int max_sectors_bytes(struct request_queue *q) |
845 | { | |
846 | unsigned int max_sectors = queue_max_sectors(q); | |
847 | ||
848 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); | |
849 | ||
850 | return max_sectors << 9; | |
851 | } | |
852 | ||
4759df90 HR |
853 | static void |
854 | sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo) | |
855 | { | |
856 | Sg_request *srp; | |
857 | int val; | |
858 | unsigned int ms; | |
859 | ||
860 | val = 0; | |
861 | list_for_each_entry(srp, &sfp->rq_list, entry) { | |
587c3c9f | 862 | if (val >= SG_MAX_QUEUE) |
4759df90 | 863 | break; |
4759df90 HR |
864 | rinfo[val].req_state = srp->done + 1; |
865 | rinfo[val].problem = | |
866 | srp->header.masked_status & | |
867 | srp->header.host_status & | |
868 | srp->header.driver_status; | |
869 | if (srp->done) | |
870 | rinfo[val].duration = | |
871 | srp->header.duration; | |
872 | else { | |
873 | ms = jiffies_to_msecs(jiffies); | |
874 | rinfo[val].duration = | |
875 | (ms > srp->header.duration) ? | |
876 | (ms - srp->header.duration) : 0; | |
877 | } | |
878 | rinfo[val].orphan = srp->orphan; | |
879 | rinfo[val].sg_io_owned = srp->sg_io_owned; | |
880 | rinfo[val].pack_id = srp->header.pack_id; | |
881 | rinfo[val].usr_ptr = srp->header.usr_ptr; | |
882 | val++; | |
883 | } | |
884 | } | |
885 | ||
fd6c3d5a AB |
886 | #ifdef CONFIG_COMPAT |
887 | struct compat_sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */ | |
888 | char req_state; | |
889 | char orphan; | |
890 | char sg_io_owned; | |
891 | char problem; | |
892 | int pack_id; | |
893 | compat_uptr_t usr_ptr; | |
894 | unsigned int duration; | |
895 | int unused; | |
896 | }; | |
897 | ||
898 | static int put_compat_request_table(struct compat_sg_req_info __user *o, | |
899 | struct sg_req_info *rinfo) | |
900 | { | |
901 | int i; | |
902 | for (i = 0; i < SG_MAX_QUEUE; i++) { | |
903 | if (copy_to_user(o + i, rinfo + i, offsetof(sg_req_info_t, usr_ptr)) || | |
904 | put_user((uintptr_t)rinfo[i].usr_ptr, &o[i].usr_ptr) || | |
905 | put_user(rinfo[i].duration, &o[i].duration) || | |
906 | put_user(rinfo[i].unused, &o[i].unused)) | |
907 | return -EFAULT; | |
908 | } | |
909 | return 0; | |
910 | } | |
911 | #endif | |
912 | ||
37b9d1e0 | 913 | static long |
d320a955 AB |
914 | sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp, |
915 | unsigned int cmd_in, void __user *p) | |
1da177e4 | 916 | { |
1da177e4 | 917 | int __user *ip = p; |
176aa9d6 | 918 | int result, val, read_only; |
1da177e4 LT |
919 | Sg_request *srp; |
920 | unsigned long iflags; | |
921 | ||
95e159d6 HR |
922 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
923 | "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); | |
1da177e4 LT |
924 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); |
925 | ||
926 | switch (cmd_in) { | |
927 | case SG_IO: | |
cc833acb | 928 | if (atomic_read(&sdp->detaching)) |
dddbf8d9 JE |
929 | return -ENODEV; |
930 | if (!scsi_block_when_processing_errors(sdp->device)) | |
931 | return -ENXIO; | |
dddbf8d9 JE |
932 | result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, |
933 | 1, read_only, 1, &srp); | |
934 | if (result < 0) | |
935 | return result; | |
3f0c6aba | 936 | result = wait_event_interruptible(sfp->read_wait, |
cc833acb DG |
937 | (srp_done(sfp, srp) || atomic_read(&sdp->detaching))); |
938 | if (atomic_read(&sdp->detaching)) | |
794c10fa JE |
939 | return -ENODEV; |
940 | write_lock_irq(&sfp->rq_list_lock); | |
941 | if (srp->done) { | |
942 | srp->done = 2; | |
dddbf8d9 | 943 | write_unlock_irq(&sfp->rq_list_lock); |
794c10fa JE |
944 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); |
945 | return (result < 0) ? result : 0; | |
1da177e4 | 946 | } |
794c10fa JE |
947 | srp->orphan = 1; |
948 | write_unlock_irq(&sfp->rq_list_lock); | |
949 | return result; /* -ERESTARTSYS because signal hit process */ | |
1da177e4 LT |
950 | case SG_SET_TIMEOUT: |
951 | result = get_user(val, ip); | |
952 | if (result) | |
953 | return result; | |
954 | if (val < 0) | |
955 | return -EIO; | |
f8630bd7 PB |
956 | if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ)) |
957 | val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ), | |
b9b6e80a | 958 | INT_MAX); |
1da177e4 | 959 | sfp->timeout_user = val; |
f8630bd7 | 960 | sfp->timeout = mult_frac(val, HZ, USER_HZ); |
1da177e4 LT |
961 | |
962 | return 0; | |
963 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
964 | /* strange ..., for backward compatibility */ | |
965 | return sfp->timeout_user; | |
966 | case SG_SET_FORCE_LOW_DMA: | |
745dfa0d HR |
967 | /* |
968 | * N.B. This ioctl never worked properly, but failed to | |
969 | * return an error value. So returning '0' to keep compability | |
970 | * with legacy applications. | |
971 | */ | |
1da177e4 LT |
972 | return 0; |
973 | case SG_GET_LOW_DMA: | |
745dfa0d | 974 | return put_user((int) sdp->device->host->unchecked_isa_dma, ip); |
1da177e4 | 975 | case SG_GET_SCSI_ID: |
a16a4741 AV |
976 | { |
977 | sg_scsi_id_t v; | |
1da177e4 | 978 | |
cc833acb | 979 | if (atomic_read(&sdp->detaching)) |
1da177e4 | 980 | return -ENODEV; |
a16a4741 AV |
981 | memset(&v, 0, sizeof(v)); |
982 | v.host_no = sdp->device->host->host_no; | |
983 | v.channel = sdp->device->channel; | |
984 | v.scsi_id = sdp->device->id; | |
985 | v.lun = sdp->device->lun; | |
986 | v.scsi_type = sdp->device->type; | |
987 | v.h_cmd_per_lun = sdp->device->host->cmd_per_lun; | |
988 | v.d_queue_depth = sdp->device->queue_depth; | |
989 | if (copy_to_user(p, &v, sizeof(sg_scsi_id_t))) | |
990 | return -EFAULT; | |
1da177e4 LT |
991 | return 0; |
992 | } | |
993 | case SG_SET_FORCE_PACK_ID: | |
994 | result = get_user(val, ip); | |
995 | if (result) | |
996 | return result; | |
997 | sfp->force_packid = val ? 1 : 0; | |
998 | return 0; | |
999 | case SG_GET_PACK_ID: | |
1da177e4 | 1000 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
109bade9 | 1001 | list_for_each_entry(srp, &sfp->rq_list, entry) { |
1da177e4 LT |
1002 | if ((1 == srp->done) && (!srp->sg_io_owned)) { |
1003 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
1004 | iflags); | |
a16a4741 | 1005 | return put_user(srp->header.pack_id, ip); |
1da177e4 LT |
1006 | } |
1007 | } | |
1008 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
a16a4741 | 1009 | return put_user(-1, ip); |
1da177e4 LT |
1010 | case SG_GET_NUM_WAITING: |
1011 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
109bade9 HR |
1012 | val = 0; |
1013 | list_for_each_entry(srp, &sfp->rq_list, entry) { | |
1da177e4 LT |
1014 | if ((1 == srp->done) && (!srp->sg_io_owned)) |
1015 | ++val; | |
1016 | } | |
1017 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1018 | return put_user(val, ip); | |
1019 | case SG_GET_SG_TABLESIZE: | |
1020 | return put_user(sdp->sg_tablesize, ip); | |
1021 | case SG_SET_RESERVED_SIZE: | |
1022 | result = get_user(val, ip); | |
1023 | if (result) | |
1024 | return result; | |
1025 | if (val < 0) | |
1026 | return -EINVAL; | |
44ec9542 | 1027 | val = min_t(int, val, |
46f69e6a | 1028 | max_sectors_bytes(sdp->device->request_queue)); |
1bc0eb04 | 1029 | mutex_lock(&sfp->f_mutex); |
1da177e4 | 1030 | if (val != sfp->reserve.bufflen) { |
1bc0eb04 HR |
1031 | if (sfp->mmap_called || |
1032 | sfp->res_in_use) { | |
1033 | mutex_unlock(&sfp->f_mutex); | |
1da177e4 | 1034 | return -EBUSY; |
1bc0eb04 HR |
1035 | } |
1036 | ||
95e159d6 | 1037 | sg_remove_scat(sfp, &sfp->reserve); |
1da177e4 LT |
1038 | sg_build_reserve(sfp, val); |
1039 | } | |
1bc0eb04 | 1040 | mutex_unlock(&sfp->f_mutex); |
1da177e4 LT |
1041 | return 0; |
1042 | case SG_GET_RESERVED_SIZE: | |
44ec9542 | 1043 | val = min_t(int, sfp->reserve.bufflen, |
46f69e6a | 1044 | max_sectors_bytes(sdp->device->request_queue)); |
1da177e4 LT |
1045 | return put_user(val, ip); |
1046 | case SG_SET_COMMAND_Q: | |
1047 | result = get_user(val, ip); | |
1048 | if (result) | |
1049 | return result; | |
1050 | sfp->cmd_q = val ? 1 : 0; | |
1051 | return 0; | |
1052 | case SG_GET_COMMAND_Q: | |
1053 | return put_user((int) sfp->cmd_q, ip); | |
1054 | case SG_SET_KEEP_ORPHAN: | |
1055 | result = get_user(val, ip); | |
1056 | if (result) | |
1057 | return result; | |
1058 | sfp->keep_orphan = val; | |
1059 | return 0; | |
1060 | case SG_GET_KEEP_ORPHAN: | |
1061 | return put_user((int) sfp->keep_orphan, ip); | |
1062 | case SG_NEXT_CMD_LEN: | |
1063 | result = get_user(val, ip); | |
1064 | if (result) | |
1065 | return result; | |
bf33f87d | 1066 | if (val > SG_MAX_CDB_SIZE) |
1067 | return -ENOMEM; | |
1da177e4 LT |
1068 | sfp->next_cmd_len = (val > 0) ? val : 0; |
1069 | return 0; | |
1070 | case SG_GET_VERSION_NUM: | |
1071 | return put_user(sg_version_num, ip); | |
1072 | case SG_GET_ACCESS_COUNT: | |
1073 | /* faked - we don't have a real access count anymore */ | |
1074 | val = (sdp->device ? 1 : 0); | |
1075 | return put_user(val, ip); | |
1076 | case SG_GET_REQUEST_TABLE: | |
fd6c3d5a | 1077 | { |
cb59e840 | 1078 | sg_req_info_t *rinfo; |
cb59e840 | 1079 | |
6396bb22 | 1080 | rinfo = kcalloc(SG_MAX_QUEUE, SZ_SG_REQ_INFO, |
3e009749 | 1081 | GFP_KERNEL); |
cb59e840 DG |
1082 | if (!rinfo) |
1083 | return -ENOMEM; | |
1da177e4 | 1084 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
4759df90 | 1085 | sg_fill_request_table(sfp, rinfo); |
1da177e4 | 1086 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
fd6c3d5a AB |
1087 | #ifdef CONFIG_COMPAT |
1088 | if (in_compat_syscall()) | |
1089 | result = put_compat_request_table(p, rinfo); | |
1090 | else | |
1091 | #endif | |
1092 | result = copy_to_user(p, rinfo, | |
1093 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
cb59e840 DG |
1094 | result = result ? -EFAULT : 0; |
1095 | kfree(rinfo); | |
1096 | return result; | |
1da177e4 LT |
1097 | } |
1098 | case SG_EMULATED_HOST: | |
cc833acb | 1099 | if (atomic_read(&sdp->detaching)) |
1da177e4 LT |
1100 | return -ENODEV; |
1101 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1da177e4 | 1102 | case SCSI_IOCTL_SEND_COMMAND: |
cc833acb | 1103 | if (atomic_read(&sdp->detaching)) |
1da177e4 | 1104 | return -ENODEV; |
e915e872 | 1105 | return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); |
1da177e4 LT |
1106 | case SG_SET_DEBUG: |
1107 | result = get_user(val, ip); | |
1108 | if (result) | |
1109 | return result; | |
1110 | sdp->sgdebug = (char) val; | |
1111 | return 0; | |
44ec9542 | 1112 | case BLKSECTGET: |
46f69e6a | 1113 | return put_user(max_sectors_bytes(sdp->device->request_queue), |
44ec9542 | 1114 | ip); |
6da127ad CS |
1115 | case BLKTRACESETUP: |
1116 | return blk_trace_setup(sdp->device->request_queue, | |
1117 | sdp->disk->disk_name, | |
76e3a19d | 1118 | MKDEV(SCSI_GENERIC_MAJOR, sdp->index), |
7475c8ae | 1119 | NULL, p); |
6da127ad CS |
1120 | case BLKTRACESTART: |
1121 | return blk_trace_startstop(sdp->device->request_queue, 1); | |
1122 | case BLKTRACESTOP: | |
1123 | return blk_trace_startstop(sdp->device->request_queue, 0); | |
1124 | case BLKTRACETEARDOWN: | |
1125 | return blk_trace_remove(sdp->device->request_queue); | |
906d15fb CH |
1126 | case SCSI_IOCTL_GET_IDLUN: |
1127 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1128 | case SCSI_IOCTL_PROBE_HOST: | |
1129 | case SG_GET_TRANSFORM: | |
1130 | case SG_SCSI_RESET: | |
1131 | if (atomic_read(&sdp->detaching)) | |
1132 | return -ENODEV; | |
1133 | break; | |
1da177e4 LT |
1134 | default: |
1135 | if (read_only) | |
1136 | return -EPERM; /* don't know so take safe approach */ | |
906d15fb | 1137 | break; |
1da177e4 | 1138 | } |
906d15fb CH |
1139 | |
1140 | result = scsi_ioctl_block_when_processing_errors(sdp->device, | |
1141 | cmd_in, filp->f_flags & O_NDELAY); | |
1142 | if (result) | |
1143 | return result; | |
d320a955 AB |
1144 | |
1145 | return -ENOIOCTLCMD; | |
1146 | } | |
1147 | ||
1148 | static long | |
1149 | sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1150 | { | |
1151 | void __user *p = (void __user *)arg; | |
1152 | Sg_device *sdp; | |
1153 | Sg_fd *sfp; | |
1154 | int ret; | |
1155 | ||
1156 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1157 | return -ENXIO; | |
1158 | ||
1159 | ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p); | |
1160 | if (ret != -ENOIOCTLCMD) | |
1161 | return ret; | |
1162 | ||
906d15fb | 1163 | return scsi_ioctl(sdp->device, cmd_in, p); |
1da177e4 LT |
1164 | } |
1165 | ||
1166 | #ifdef CONFIG_COMPAT | |
1167 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1168 | { | |
d320a955 | 1169 | void __user *p = compat_ptr(arg); |
1da177e4 LT |
1170 | Sg_device *sdp; |
1171 | Sg_fd *sfp; | |
d320a955 | 1172 | int ret; |
1da177e4 LT |
1173 | |
1174 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1175 | return -ENXIO; | |
1176 | ||
d320a955 AB |
1177 | ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p); |
1178 | if (ret != -ENOIOCTLCMD) | |
1da177e4 | 1179 | return ret; |
d320a955 AB |
1180 | |
1181 | return scsi_compat_ioctl(sdp->device, cmd_in, p); | |
1da177e4 LT |
1182 | } |
1183 | #endif | |
1184 | ||
afc9a42b | 1185 | static __poll_t |
1da177e4 LT |
1186 | sg_poll(struct file *filp, poll_table * wait) |
1187 | { | |
afc9a42b | 1188 | __poll_t res = 0; |
1da177e4 LT |
1189 | Sg_device *sdp; |
1190 | Sg_fd *sfp; | |
1191 | Sg_request *srp; | |
1192 | int count = 0; | |
1193 | unsigned long iflags; | |
1194 | ||
ebaf466b JE |
1195 | sfp = filp->private_data; |
1196 | if (!sfp) | |
a9a08845 | 1197 | return EPOLLERR; |
ebaf466b JE |
1198 | sdp = sfp->parentdp; |
1199 | if (!sdp) | |
a9a08845 | 1200 | return EPOLLERR; |
1da177e4 LT |
1201 | poll_wait(filp, &sfp->read_wait, wait); |
1202 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
109bade9 | 1203 | list_for_each_entry(srp, &sfp->rq_list, entry) { |
1da177e4 LT |
1204 | /* if any read waiting, flag it */ |
1205 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
a9a08845 | 1206 | res = EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
1207 | ++count; |
1208 | } | |
1209 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1210 | ||
cc833acb | 1211 | if (atomic_read(&sdp->detaching)) |
a9a08845 | 1212 | res |= EPOLLHUP; |
1da177e4 LT |
1213 | else if (!sfp->cmd_q) { |
1214 | if (0 == count) | |
a9a08845 | 1215 | res |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 1216 | } else if (count < SG_MAX_QUEUE) |
a9a08845 | 1217 | res |= EPOLLOUT | EPOLLWRNORM; |
95e159d6 | 1218 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
fcc5a652 | 1219 | "sg_poll: res=0x%x\n", (__force u32) res)); |
1da177e4 LT |
1220 | return res; |
1221 | } | |
1222 | ||
1223 | static int | |
1224 | sg_fasync(int fd, struct file *filp, int mode) | |
1225 | { | |
1da177e4 LT |
1226 | Sg_device *sdp; |
1227 | Sg_fd *sfp; | |
1228 | ||
1229 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1230 | return -ENXIO; | |
95e159d6 HR |
1231 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
1232 | "sg_fasync: mode=%d\n", mode)); | |
1da177e4 | 1233 | |
60aa4924 | 1234 | return fasync_helper(fd, filp, mode, &sfp->async_qp); |
1da177e4 LT |
1235 | } |
1236 | ||
0cac8e1b | 1237 | static vm_fault_t |
11bac800 | 1238 | sg_vma_fault(struct vm_fault *vmf) |
1da177e4 | 1239 | { |
11bac800 | 1240 | struct vm_area_struct *vma = vmf->vma; |
1da177e4 | 1241 | Sg_fd *sfp; |
d6b10348 | 1242 | unsigned long offset, len, sa; |
1da177e4 | 1243 | Sg_scatter_hold *rsv_schp; |
10db10d1 | 1244 | int k, length; |
1da177e4 LT |
1245 | |
1246 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
a13ff0bb | 1247 | return VM_FAULT_SIGBUS; |
1da177e4 | 1248 | rsv_schp = &sfp->reserve; |
a13ff0bb | 1249 | offset = vmf->pgoff << PAGE_SHIFT; |
1da177e4 | 1250 | if (offset >= rsv_schp->bufflen) |
a13ff0bb | 1251 | return VM_FAULT_SIGBUS; |
95e159d6 HR |
1252 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
1253 | "sg_vma_fault: offset=%lu, scatg=%d\n", | |
1254 | offset, rsv_schp->k_use_sg)); | |
d6b10348 | 1255 | sa = vma->vm_start; |
10db10d1 FT |
1256 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1257 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
d6b10348 | 1258 | len = vma->vm_end - sa; |
10db10d1 | 1259 | len = (len < length) ? len : length; |
d6b10348 | 1260 | if (offset < len) { |
10db10d1 FT |
1261 | struct page *page = nth_page(rsv_schp->pages[k], |
1262 | offset >> PAGE_SHIFT); | |
d6b10348 | 1263 | get_page(page); /* increment page count */ |
a13ff0bb NP |
1264 | vmf->page = page; |
1265 | return 0; /* success */ | |
1da177e4 | 1266 | } |
d6b10348 MC |
1267 | sa += len; |
1268 | offset -= len; | |
1da177e4 | 1269 | } |
d6b10348 | 1270 | |
a13ff0bb | 1271 | return VM_FAULT_SIGBUS; |
1da177e4 LT |
1272 | } |
1273 | ||
f0f37e2f | 1274 | static const struct vm_operations_struct sg_mmap_vm_ops = { |
a13ff0bb | 1275 | .fault = sg_vma_fault, |
1da177e4 LT |
1276 | }; |
1277 | ||
1278 | static int | |
1279 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1280 | { | |
1281 | Sg_fd *sfp; | |
d6b10348 | 1282 | unsigned long req_sz, len, sa; |
1da177e4 | 1283 | Sg_scatter_hold *rsv_schp; |
10db10d1 | 1284 | int k, length; |
6a8dadcc | 1285 | int ret = 0; |
1da177e4 LT |
1286 | |
1287 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1288 | return -ENXIO; | |
cb59e840 | 1289 | req_sz = vma->vm_end - vma->vm_start; |
95e159d6 HR |
1290 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
1291 | "sg_mmap starting, vm_start=%p, len=%d\n", | |
1292 | (void *) vma->vm_start, (int) req_sz)); | |
1da177e4 LT |
1293 | if (vma->vm_pgoff) |
1294 | return -EINVAL; /* want no offset */ | |
1295 | rsv_schp = &sfp->reserve; | |
6a8dadcc TP |
1296 | mutex_lock(&sfp->f_mutex); |
1297 | if (req_sz > rsv_schp->bufflen) { | |
1298 | ret = -ENOMEM; /* cannot map more than reserved buffer */ | |
1299 | goto out; | |
1300 | } | |
1da177e4 | 1301 | |
d6b10348 | 1302 | sa = vma->vm_start; |
10db10d1 FT |
1303 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1304 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
d6b10348 | 1305 | len = vma->vm_end - sa; |
10db10d1 | 1306 | len = (len < length) ? len : length; |
d6b10348 | 1307 | sa += len; |
1da177e4 | 1308 | } |
d6b10348 | 1309 | |
f9aed0e2 | 1310 | sfp->mmap_called = 1; |
461c7fa1 | 1311 | vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; |
1da177e4 LT |
1312 | vma->vm_private_data = sfp; |
1313 | vma->vm_ops = &sg_mmap_vm_ops; | |
6a8dadcc TP |
1314 | out: |
1315 | mutex_unlock(&sfp->f_mutex); | |
1316 | return ret; | |
1da177e4 LT |
1317 | } |
1318 | ||
cc833acb DG |
1319 | static void |
1320 | sg_rq_end_io_usercontext(struct work_struct *work) | |
c96952ed FT |
1321 | { |
1322 | struct sg_request *srp = container_of(work, struct sg_request, ew.work); | |
1323 | struct sg_fd *sfp = srp->parentfp; | |
1324 | ||
1325 | sg_finish_rem_req(srp); | |
97d27b0d | 1326 | sg_remove_request(sfp, srp); |
c96952ed FT |
1327 | kref_put(&sfp->f_ref, sg_remove_sfp); |
1328 | } | |
1329 | ||
a91a3a20 FT |
1330 | /* |
1331 | * This function is a "bottom half" handler that is called by the mid | |
1332 | * level when a command is completed (or has failed). | |
1333 | */ | |
cc833acb | 1334 | static void |
2a842aca | 1335 | sg_rq_end_io(struct request *rq, blk_status_t status) |
1da177e4 | 1336 | { |
a91a3a20 | 1337 | struct sg_request *srp = rq->end_io_data; |
82ed4db4 | 1338 | struct scsi_request *req = scsi_req(rq); |
c6517b79 | 1339 | Sg_device *sdp; |
1da177e4 | 1340 | Sg_fd *sfp; |
1da177e4 | 1341 | unsigned long iflags; |
cb59e840 | 1342 | unsigned int ms; |
a91a3a20 | 1343 | char *sense; |
c6517b79 | 1344 | int result, resid, done = 1; |
1da177e4 | 1345 | |
c6517b79 | 1346 | if (WARN_ON(srp->done != 0)) |
1da177e4 | 1347 | return; |
c6517b79 | 1348 | |
1da177e4 | 1349 | sfp = srp->parentfp; |
c6517b79 | 1350 | if (WARN_ON(sfp == NULL)) |
1da177e4 | 1351 | return; |
c6517b79 TB |
1352 | |
1353 | sdp = sfp->parentdp; | |
cc833acb DG |
1354 | if (unlikely(atomic_read(&sdp->detaching))) |
1355 | pr_info("%s: device detaching\n", __func__); | |
1da177e4 | 1356 | |
82ed4db4 | 1357 | sense = req->sense; |
17d5363b | 1358 | result = req->result; |
82ed4db4 | 1359 | resid = req->resid_len; |
1da177e4 | 1360 | |
95e159d6 HR |
1361 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
1362 | "sg_cmd_done: pack_id=%d, res=0x%x\n", | |
1363 | srp->header.pack_id, result)); | |
d6b10348 | 1364 | srp->header.resid = resid; |
cb59e840 DG |
1365 | ms = jiffies_to_msecs(jiffies); |
1366 | srp->header.duration = (ms > srp->header.duration) ? | |
1367 | (ms - srp->header.duration) : 0; | |
d6b10348 | 1368 | if (0 != result) { |
1da177e4 LT |
1369 | struct scsi_sense_hdr sshdr; |
1370 | ||
d6b10348 MC |
1371 | srp->header.status = 0xff & result; |
1372 | srp->header.masked_status = status_byte(result); | |
1373 | srp->header.msg_status = msg_byte(result); | |
1374 | srp->header.host_status = host_byte(result); | |
1375 | srp->header.driver_status = driver_byte(result); | |
1da177e4 LT |
1376 | if ((sdp->sgdebug > 0) && |
1377 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1378 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
d811b848 | 1379 | __scsi_print_sense(sdp->device, __func__, sense, |
d6b10348 | 1380 | SCSI_SENSE_BUFFERSIZE); |
1da177e4 LT |
1381 | |
1382 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
d6b10348 MC |
1383 | if (driver_byte(result) != 0 |
1384 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) | |
1da177e4 LT |
1385 | && !scsi_sense_is_deferred(&sshdr) |
1386 | && sshdr.sense_key == UNIT_ATTENTION | |
1387 | && sdp->device->removable) { | |
1388 | /* Detected possible disc change. Set the bit - this */ | |
1389 | /* may be used if there are filesystems using this device */ | |
1390 | sdp->device->changed = 1; | |
1391 | } | |
1392 | } | |
82ed4db4 CH |
1393 | |
1394 | if (req->sense_len) | |
1395 | memcpy(srp->sense_b, req->sense, SCSI_SENSE_BUFFERSIZE); | |
1396 | ||
1da177e4 LT |
1397 | /* Rely on write phase to clean out srp status values, so no "else" */ |
1398 | ||
7568615c TB |
1399 | /* |
1400 | * Free the request as soon as it is complete so that its resources | |
1401 | * can be reused without waiting for userspace to read() the | |
1402 | * result. But keep the associated bio (if any) around until | |
1403 | * blk_rq_unmap_user() can be called from user context. | |
1404 | */ | |
1405 | srp->rq = NULL; | |
82ed4db4 | 1406 | scsi_req_free_cmd(scsi_req(rq)); |
92bc5a24 | 1407 | blk_put_request(rq); |
7568615c | 1408 | |
c6517b79 TB |
1409 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
1410 | if (unlikely(srp->orphan)) { | |
1da177e4 LT |
1411 | if (sfp->keep_orphan) |
1412 | srp->sg_io_owned = 0; | |
c6517b79 TB |
1413 | else |
1414 | done = 0; | |
1da177e4 | 1415 | } |
c6517b79 TB |
1416 | srp->done = done; |
1417 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1418 | ||
1419 | if (likely(done)) { | |
1420 | /* Now wake up any sg_read() that is waiting for this | |
1421 | * packet. | |
1422 | */ | |
1da177e4 | 1423 | wake_up_interruptible(&sfp->read_wait); |
c6517b79 | 1424 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); |
c96952ed | 1425 | kref_put(&sfp->f_ref, sg_remove_sfp); |
015640ed FT |
1426 | } else { |
1427 | INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); | |
1428 | schedule_work(&srp->ew.work); | |
1429 | } | |
1da177e4 LT |
1430 | } |
1431 | ||
828c0950 | 1432 | static const struct file_operations sg_fops = { |
1da177e4 LT |
1433 | .owner = THIS_MODULE, |
1434 | .read = sg_read, | |
1435 | .write = sg_write, | |
1436 | .poll = sg_poll, | |
37b9d1e0 | 1437 | .unlocked_ioctl = sg_ioctl, |
1da177e4 LT |
1438 | #ifdef CONFIG_COMPAT |
1439 | .compat_ioctl = sg_compat_ioctl, | |
1440 | #endif | |
1441 | .open = sg_open, | |
1442 | .mmap = sg_mmap, | |
1443 | .release = sg_release, | |
1444 | .fasync = sg_fasync, | |
6038f373 | 1445 | .llseek = no_llseek, |
1da177e4 LT |
1446 | }; |
1447 | ||
d253878b | 1448 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1449 | |
1450 | static int sg_sysfs_valid = 0; | |
1451 | ||
cc833acb DG |
1452 | static Sg_device * |
1453 | sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) | |
1da177e4 | 1454 | { |
d6b10348 | 1455 | struct request_queue *q = scsidp->request_queue; |
1da177e4 LT |
1456 | Sg_device *sdp; |
1457 | unsigned long iflags; | |
7c07d613 JB |
1458 | int error; |
1459 | u32 k; | |
1da177e4 | 1460 | |
24669f75 | 1461 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
1da177e4 | 1462 | if (!sdp) { |
cc833acb DG |
1463 | sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " |
1464 | "failure\n", __func__); | |
7c07d613 JB |
1465 | return ERR_PTR(-ENOMEM); |
1466 | } | |
c6517b79 | 1467 | |
b98c52b5 | 1468 | idr_preload(GFP_KERNEL); |
7c07d613 | 1469 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 | 1470 | |
b98c52b5 TH |
1471 | error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); |
1472 | if (error < 0) { | |
1473 | if (error == -ENOSPC) { | |
1474 | sdev_printk(KERN_WARNING, scsidp, | |
1475 | "Unable to attach sg device type=%d, minor number exceeds %d\n", | |
1476 | scsidp->type, SG_MAX_DEVS - 1); | |
1477 | error = -ENODEV; | |
1478 | } else { | |
cc833acb DG |
1479 | sdev_printk(KERN_WARNING, scsidp, "%s: idr " |
1480 | "allocation Sg_device failure: %d\n", | |
1481 | __func__, error); | |
b98c52b5 TH |
1482 | } |
1483 | goto out_unlock; | |
1da177e4 | 1484 | } |
b98c52b5 | 1485 | k = error; |
1da177e4 | 1486 | |
95e159d6 HR |
1487 | SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, |
1488 | "sg_alloc: dev=%d \n", k)); | |
1da177e4 LT |
1489 | sprintf(disk->disk_name, "sg%d", k); |
1490 | disk->first_minor = k; | |
1491 | sdp->disk = disk; | |
1492 | sdp->device = scsidp; | |
cc833acb | 1493 | mutex_init(&sdp->open_rel_lock); |
3442f802 | 1494 | INIT_LIST_HEAD(&sdp->sfds); |
cc833acb DG |
1495 | init_waitqueue_head(&sdp->open_wait); |
1496 | atomic_set(&sdp->detaching, 0); | |
1497 | rwlock_init(&sdp->sfd_lock); | |
8a78362c | 1498 | sdp->sg_tablesize = queue_max_segments(q); |
7c07d613 | 1499 | sdp->index = k; |
c6517b79 | 1500 | kref_init(&sdp->d_ref); |
b98c52b5 | 1501 | error = 0; |
c6517b79 | 1502 | |
b98c52b5 | 1503 | out_unlock: |
c6517b79 | 1504 | write_unlock_irqrestore(&sg_index_lock, iflags); |
b98c52b5 | 1505 | idr_preload_end(); |
1da177e4 | 1506 | |
7c07d613 | 1507 | if (error) { |
1da177e4 | 1508 | kfree(sdp); |
7c07d613 JB |
1509 | return ERR_PTR(error); |
1510 | } | |
1511 | return sdp; | |
1da177e4 LT |
1512 | } |
1513 | ||
1514 | static int | |
cc833acb | 1515 | sg_add_device(struct device *cl_dev, struct class_interface *cl_intf) |
1da177e4 | 1516 | { |
ee959b00 | 1517 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1da177e4 LT |
1518 | struct gendisk *disk; |
1519 | Sg_device *sdp = NULL; | |
1520 | struct cdev * cdev = NULL; | |
7c07d613 | 1521 | int error; |
454e8957 | 1522 | unsigned long iflags; |
1da177e4 LT |
1523 | |
1524 | disk = alloc_disk(1); | |
1525 | if (!disk) { | |
cc833acb | 1526 | pr_warn("%s: alloc_disk failed\n", __func__); |
1da177e4 LT |
1527 | return -ENOMEM; |
1528 | } | |
1529 | disk->major = SCSI_GENERIC_MAJOR; | |
1530 | ||
1531 | error = -ENOMEM; | |
1532 | cdev = cdev_alloc(); | |
1533 | if (!cdev) { | |
cc833acb | 1534 | pr_warn("%s: cdev_alloc failed\n", __func__); |
1da177e4 LT |
1535 | goto out; |
1536 | } | |
1537 | cdev->owner = THIS_MODULE; | |
1538 | cdev->ops = &sg_fops; | |
1539 | ||
7c07d613 JB |
1540 | sdp = sg_alloc(disk, scsidp); |
1541 | if (IS_ERR(sdp)) { | |
cc833acb | 1542 | pr_warn("%s: sg_alloc failed\n", __func__); |
7c07d613 | 1543 | error = PTR_ERR(sdp); |
1da177e4 LT |
1544 | goto out; |
1545 | } | |
1da177e4 | 1546 | |
7c07d613 | 1547 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
5e3c34c1 | 1548 | if (error) |
454e8957 | 1549 | goto cdev_add_err; |
5e3c34c1 | 1550 | |
1da177e4 LT |
1551 | sdp->cdev = cdev; |
1552 | if (sg_sysfs_valid) { | |
ee959b00 | 1553 | struct device *sg_class_member; |
1da177e4 | 1554 | |
d73a1a67 GKH |
1555 | sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, |
1556 | MKDEV(SCSI_GENERIC_MAJOR, | |
1557 | sdp->index), | |
1558 | sdp, "%s", disk->disk_name); | |
d07e0361 | 1559 | if (IS_ERR(sg_class_member)) { |
cc833acb | 1560 | pr_err("%s: device_create failed\n", __func__); |
d07e0361 FT |
1561 | error = PTR_ERR(sg_class_member); |
1562 | goto cdev_add_err; | |
1563 | } | |
d07e0361 | 1564 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
1da177e4 LT |
1565 | &sg_class_member->kobj, "generic"); |
1566 | if (error) | |
cc833acb DG |
1567 | pr_err("%s: unable to make symlink 'generic' back " |
1568 | "to sg%d\n", __func__, sdp->index); | |
1da177e4 | 1569 | } else |
cc833acb | 1570 | pr_warn("%s: sg_sys Invalid\n", __func__); |
1da177e4 | 1571 | |
cc833acb DG |
1572 | sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d " |
1573 | "type %d\n", sdp->index, scsidp->type); | |
1da177e4 | 1574 | |
ee959b00 | 1575 | dev_set_drvdata(cl_dev, sdp); |
a24484f2 | 1576 | |
1da177e4 LT |
1577 | return 0; |
1578 | ||
454e8957 | 1579 | cdev_add_err: |
7c07d613 JB |
1580 | write_lock_irqsave(&sg_index_lock, iflags); |
1581 | idr_remove(&sg_index_idr, sdp->index); | |
1582 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1583 | kfree(sdp); | |
454e8957 | 1584 | |
1da177e4 LT |
1585 | out: |
1586 | put_disk(disk); | |
1587 | if (cdev) | |
1588 | cdev_del(cdev); | |
1589 | return error; | |
1590 | } | |
1591 | ||
cc833acb DG |
1592 | static void |
1593 | sg_device_destroy(struct kref *kref) | |
c6517b79 TB |
1594 | { |
1595 | struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); | |
1596 | unsigned long flags; | |
1597 | ||
1598 | /* CAUTION! Note that the device can still be found via idr_find() | |
1599 | * even though the refcount is 0. Therefore, do idr_remove() BEFORE | |
1600 | * any other cleanup. | |
1601 | */ | |
1602 | ||
1603 | write_lock_irqsave(&sg_index_lock, flags); | |
1604 | idr_remove(&sg_index_idr, sdp->index); | |
1605 | write_unlock_irqrestore(&sg_index_lock, flags); | |
1606 | ||
1607 | SCSI_LOG_TIMEOUT(3, | |
95e159d6 | 1608 | sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); |
c6517b79 TB |
1609 | |
1610 | put_disk(sdp->disk); | |
1611 | kfree(sdp); | |
1612 | } | |
1613 | ||
cc833acb DG |
1614 | static void |
1615 | sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) | |
1da177e4 | 1616 | { |
ee959b00 TJ |
1617 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1618 | Sg_device *sdp = dev_get_drvdata(cl_dev); | |
1da177e4 LT |
1619 | unsigned long iflags; |
1620 | Sg_fd *sfp; | |
cc833acb | 1621 | int val; |
1da177e4 | 1622 | |
cc833acb | 1623 | if (!sdp) |
1da177e4 | 1624 | return; |
cc833acb DG |
1625 | /* want sdp->detaching non-zero as soon as possible */ |
1626 | val = atomic_inc_return(&sdp->detaching); | |
1627 | if (val > 1) | |
1628 | return; /* only want to do following once per device */ | |
7c07d613 | 1629 | |
95e159d6 HR |
1630 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
1631 | "%s\n", __func__)); | |
c6517b79 | 1632 | |
cc833acb | 1633 | read_lock_irqsave(&sdp->sfd_lock, iflags); |
3442f802 | 1634 | list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { |
cc833acb | 1635 | wake_up_interruptible_all(&sfp->read_wait); |
c6517b79 | 1636 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); |
7c07d613 | 1637 | } |
cc833acb DG |
1638 | wake_up_interruptible_all(&sdp->open_wait); |
1639 | read_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
7c07d613 JB |
1640 | |
1641 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
ee959b00 | 1642 | device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
7c07d613 JB |
1643 | cdev_del(sdp->cdev); |
1644 | sdp->cdev = NULL; | |
1da177e4 | 1645 | |
cc833acb | 1646 | kref_put(&sdp->d_ref, sg_device_destroy); |
1da177e4 LT |
1647 | } |
1648 | ||
6460e75a DG |
1649 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
1650 | module_param_named(def_reserved_size, def_reserved_size, int, | |
1651 | S_IRUGO | S_IWUSR); | |
1da177e4 LT |
1652 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
1653 | ||
1654 | MODULE_AUTHOR("Douglas Gilbert"); | |
1655 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1656 | MODULE_LICENSE("GPL"); | |
1657 | MODULE_VERSION(SG_VERSION_STR); | |
f018fa55 | 1658 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
1da177e4 | 1659 | |
6460e75a DG |
1660 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
1661 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); | |
1da177e4 LT |
1662 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
1663 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1664 | ||
1665 | static int __init | |
1666 | init_sg(void) | |
1667 | { | |
1668 | int rc; | |
1669 | ||
6460e75a DG |
1670 | if (scatter_elem_sz < PAGE_SIZE) { |
1671 | scatter_elem_sz = PAGE_SIZE; | |
1672 | scatter_elem_sz_prev = scatter_elem_sz; | |
1673 | } | |
1da177e4 LT |
1674 | if (def_reserved_size >= 0) |
1675 | sg_big_buff = def_reserved_size; | |
6460e75a DG |
1676 | else |
1677 | def_reserved_size = sg_big_buff; | |
1da177e4 LT |
1678 | |
1679 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1680 | SG_MAX_DEVS, "sg"); | |
1681 | if (rc) | |
1682 | return rc; | |
d253878b | 1683 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
1da177e4 LT |
1684 | if ( IS_ERR(sg_sysfs_class) ) { |
1685 | rc = PTR_ERR(sg_sysfs_class); | |
1686 | goto err_out; | |
1687 | } | |
1688 | sg_sysfs_valid = 1; | |
1689 | rc = scsi_register_interface(&sg_interface); | |
1690 | if (0 == rc) { | |
1691 | #ifdef CONFIG_SCSI_PROC_FS | |
1692 | sg_proc_init(); | |
1693 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1694 | return 0; | |
1695 | } | |
d253878b | 1696 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1697 | err_out: |
1698 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1699 | return rc; | |
1700 | } | |
1701 | ||
1702 | static void __exit | |
1703 | exit_sg(void) | |
1704 | { | |
1705 | #ifdef CONFIG_SCSI_PROC_FS | |
b8b1483d | 1706 | remove_proc_subtree("scsi/sg", NULL); |
1da177e4 LT |
1707 | #endif /* CONFIG_SCSI_PROC_FS */ |
1708 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1709 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1710 | sg_sysfs_valid = 0; |
1711 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1712 | SG_MAX_DEVS); | |
7c07d613 | 1713 | idr_destroy(&sg_index_idr); |
1da177e4 LT |
1714 | } |
1715 | ||
cc833acb DG |
1716 | static int |
1717 | sg_start_req(Sg_request *srp, unsigned char *cmd) | |
10865dfa | 1718 | { |
626710c9 | 1719 | int res; |
10865dfa | 1720 | struct request *rq; |
82ed4db4 | 1721 | struct scsi_request *req; |
44c7b0ea FT |
1722 | Sg_fd *sfp = srp->parentfp; |
1723 | sg_io_hdr_t *hp = &srp->header; | |
1724 | int dxfer_len = (int) hp->dxfer_len; | |
1725 | int dxfer_dir = hp->dxfer_direction; | |
626710c9 | 1726 | unsigned int iov_count = hp->iovec_count; |
44c7b0ea FT |
1727 | Sg_scatter_hold *req_schp = &srp->data; |
1728 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1729 | struct request_queue *q = sfp->parentdp->device->request_queue; | |
626710c9 | 1730 | struct rq_map_data *md, map_data; |
10865dfa | 1731 | int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; |
65c26a0f | 1732 | unsigned char *long_cmdp = NULL; |
10865dfa | 1733 | |
95e159d6 HR |
1734 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1735 | "sg_start_req: dxfer_len=%d\n", | |
1736 | dxfer_len)); | |
44c7b0ea | 1737 | |
65c26a0f DG |
1738 | if (hp->cmd_len > BLK_MAX_CDB) { |
1739 | long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL); | |
1740 | if (!long_cmdp) | |
1741 | return -ENOMEM; | |
1742 | } | |
1743 | ||
7772855a TB |
1744 | /* |
1745 | * NOTE | |
1746 | * | |
1747 | * With scsi-mq enabled, there are a fixed number of preallocated | |
1748 | * requests equal in number to shost->can_queue. If all of the | |
8e4a4189 TB |
1749 | * preallocated requests are already in use, then blk_get_request() |
1750 | * will sleep until an active command completes, freeing up a request. | |
1751 | * Although waiting in an asynchronous interface is less than ideal, we | |
1752 | * do not want to use BLK_MQ_REQ_NOWAIT here because userspace might | |
1753 | * not expect an EWOULDBLOCK from this condition. | |
7772855a | 1754 | */ |
aebf526b | 1755 | rq = blk_get_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ? |
ff005a06 | 1756 | REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); |
a492f075 | 1757 | if (IS_ERR(rq)) { |
65c26a0f | 1758 | kfree(long_cmdp); |
a492f075 | 1759 | return PTR_ERR(rq); |
65c26a0f | 1760 | } |
82ed4db4 | 1761 | req = scsi_req(rq); |
10865dfa | 1762 | |
65c26a0f | 1763 | if (hp->cmd_len > BLK_MAX_CDB) |
82ed4db4 CH |
1764 | req->cmd = long_cmdp; |
1765 | memcpy(req->cmd, cmd, hp->cmd_len); | |
1766 | req->cmd_len = hp->cmd_len; | |
10865dfa FT |
1767 | |
1768 | srp->rq = rq; | |
1769 | rq->end_io_data = srp; | |
64c7f1d1 | 1770 | req->retries = SG_DEFAULT_RETRIES; |
10865dfa | 1771 | |
1da177e4 | 1772 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) |
10db10d1 | 1773 | return 0; |
10865dfa | 1774 | |
626710c9 FT |
1775 | if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && |
1776 | dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && | |
1777 | !sfp->parentdp->device->host->unchecked_isa_dma && | |
2610a254 | 1778 | blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) |
626710c9 FT |
1779 | md = NULL; |
1780 | else | |
1781 | md = &map_data; | |
1782 | ||
1783 | if (md) { | |
1bc0eb04 HR |
1784 | mutex_lock(&sfp->f_mutex); |
1785 | if (dxfer_len <= rsv_schp->bufflen && | |
1786 | !sfp->res_in_use) { | |
1787 | sfp->res_in_use = 1; | |
626710c9 | 1788 | sg_link_reserve(sfp, srp, dxfer_len); |
8d26f491 TP |
1789 | } else if (hp->flags & SG_FLAG_MMAP_IO) { |
1790 | res = -EBUSY; /* sfp->res_in_use == 1 */ | |
1791 | if (dxfer_len > rsv_schp->bufflen) | |
1792 | res = -ENOMEM; | |
1bc0eb04 | 1793 | mutex_unlock(&sfp->f_mutex); |
8d26f491 | 1794 | return res; |
1bc0eb04 | 1795 | } else { |
626710c9 | 1796 | res = sg_build_indirect(req_schp, sfp, dxfer_len); |
1bc0eb04 HR |
1797 | if (res) { |
1798 | mutex_unlock(&sfp->f_mutex); | |
626710c9 | 1799 | return res; |
1bc0eb04 | 1800 | } |
626710c9 | 1801 | } |
1bc0eb04 | 1802 | mutex_unlock(&sfp->f_mutex); |
7e56cb0f | 1803 | |
626710c9 FT |
1804 | md->pages = req_schp->pages; |
1805 | md->page_order = req_schp->page_order; | |
1806 | md->nr_entries = req_schp->k_use_sg; | |
56c451f4 | 1807 | md->offset = 0; |
97ae77a1 | 1808 | md->null_mapped = hp->dxferp ? 0 : 1; |
ecb554a8 FT |
1809 | if (dxfer_dir == SG_DXFER_TO_FROM_DEV) |
1810 | md->from_user = 1; | |
1811 | else | |
1812 | md->from_user = 0; | |
626710c9 FT |
1813 | } |
1814 | ||
0fdf96b6 | 1815 | if (iov_count) { |
fdc81f45 | 1816 | struct iovec *iov = NULL; |
26e49cfc | 1817 | struct iov_iter i; |
0fdf96b6 | 1818 | |
98aaaec4 AB |
1819 | #ifdef CONFIG_COMPAT |
1820 | if (in_compat_syscall()) | |
1821 | res = compat_import_iovec(rw, hp->dxferp, iov_count, | |
1822 | 0, &iov, &i); | |
1823 | else | |
1824 | #endif | |
1825 | res = import_iovec(rw, hp->dxferp, iov_count, | |
1826 | 0, &iov, &i); | |
fdc81f45 AV |
1827 | if (res < 0) |
1828 | return res; | |
0fdf96b6 | 1829 | |
fdc81f45 | 1830 | iov_iter_truncate(&i, hp->dxfer_len); |
137d01df AV |
1831 | if (!iov_iter_count(&i)) { |
1832 | kfree(iov); | |
1833 | return -EINVAL; | |
1834 | } | |
0fdf96b6 | 1835 | |
26e49cfc | 1836 | res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC); |
0fdf96b6 FT |
1837 | kfree(iov); |
1838 | } else | |
626710c9 FT |
1839 | res = blk_rq_map_user(q, rq, md, hp->dxferp, |
1840 | hp->dxfer_len, GFP_ATOMIC); | |
10db10d1 FT |
1841 | |
1842 | if (!res) { | |
626710c9 | 1843 | srp->bio = rq->bio; |
10db10d1 | 1844 | |
626710c9 FT |
1845 | if (!md) { |
1846 | req_schp->dio_in_use = 1; | |
1847 | hp->info |= SG_INFO_DIRECT_IO; | |
1848 | } | |
1849 | } | |
10db10d1 | 1850 | return res; |
1da177e4 LT |
1851 | } |
1852 | ||
cc833acb DG |
1853 | static int |
1854 | sg_finish_rem_req(Sg_request *srp) | |
1da177e4 | 1855 | { |
e7ee4cc0 FT |
1856 | int ret = 0; |
1857 | ||
1da177e4 LT |
1858 | Sg_fd *sfp = srp->parentfp; |
1859 | Sg_scatter_hold *req_schp = &srp->data; | |
1860 | ||
95e159d6 HR |
1861 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1862 | "sg_finish_rem_req: res_used=%d\n", | |
1863 | (int) srp->res_used)); | |
7568615c TB |
1864 | if (srp->bio) |
1865 | ret = blk_rq_unmap_user(srp->bio); | |
10db10d1 | 1866 | |
7568615c | 1867 | if (srp->rq) { |
82ed4db4 | 1868 | scsi_req_free_cmd(scsi_req(srp->rq)); |
10865dfa | 1869 | blk_put_request(srp->rq); |
6e5a30cb | 1870 | } |
10865dfa | 1871 | |
e27168f8 CS |
1872 | if (srp->res_used) |
1873 | sg_unlink_reserve(sfp, srp); | |
1874 | else | |
95e159d6 | 1875 | sg_remove_scat(sfp, req_schp); |
e27168f8 | 1876 | |
e7ee4cc0 | 1877 | return ret; |
1da177e4 LT |
1878 | } |
1879 | ||
1880 | static int | |
1881 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1882 | { | |
10db10d1 | 1883 | int sg_bufflen = tablesize * sizeof(struct page *); |
2d20eaf9 | 1884 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 1885 | |
10db10d1 FT |
1886 | schp->pages = kzalloc(sg_bufflen, gfp_flags); |
1887 | if (!schp->pages) | |
1da177e4 | 1888 | return -ENOMEM; |
1da177e4 | 1889 | schp->sglist_len = sg_bufflen; |
d6b10348 | 1890 | return tablesize; /* number of scat_gath elements allocated */ |
1da177e4 LT |
1891 | } |
1892 | ||
1da177e4 LT |
1893 | static int |
1894 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1895 | { | |
10db10d1 | 1896 | int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; |
d6b10348 | 1897 | int sg_tablesize = sfp->parentdp->sg_tablesize; |
10db10d1 | 1898 | int blk_size = buff_size, order; |
5b9d3974 | 1899 | gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN | __GFP_ZERO; |
745dfa0d | 1900 | struct sg_device *sdp = sfp->parentdp; |
1da177e4 | 1901 | |
fb119935 | 1902 | if (blk_size < 0) |
1da177e4 LT |
1903 | return -EFAULT; |
1904 | if (0 == blk_size) | |
1905 | ++blk_size; /* don't know why */ | |
b2ed6c69 FT |
1906 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ |
1907 | blk_size = ALIGN(blk_size, SG_SECTOR_SZ); | |
95e159d6 HR |
1908 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1909 | "sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1910 | buff_size, blk_size)); | |
d6b10348 MC |
1911 | |
1912 | /* N.B. ret_sz carried into this block ... */ | |
1913 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1914 | if (mx_sc_elems < 0) | |
1915 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1916 | ||
6460e75a DG |
1917 | num = scatter_elem_sz; |
1918 | if (unlikely(num != scatter_elem_sz_prev)) { | |
1919 | if (num < PAGE_SIZE) { | |
1920 | scatter_elem_sz = PAGE_SIZE; | |
1921 | scatter_elem_sz_prev = PAGE_SIZE; | |
1922 | } else | |
1923 | scatter_elem_sz_prev = num; | |
1924 | } | |
10db10d1 | 1925 | |
745dfa0d | 1926 | if (sdp->device->host->unchecked_isa_dma) |
10db10d1 FT |
1927 | gfp_mask |= GFP_DMA; |
1928 | ||
10db10d1 FT |
1929 | order = get_order(num); |
1930 | retry: | |
1931 | ret_sz = 1 << (PAGE_SHIFT + order); | |
1932 | ||
1933 | for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; | |
1934 | k++, rem_sz -= ret_sz) { | |
1935 | ||
6460e75a | 1936 | num = (rem_sz > scatter_elem_sz_prev) ? |
10db10d1 FT |
1937 | scatter_elem_sz_prev : rem_sz; |
1938 | ||
5b9d3974 | 1939 | schp->pages[k] = alloc_pages(gfp_mask, order); |
10db10d1 FT |
1940 | if (!schp->pages[k]) |
1941 | goto out; | |
d6b10348 | 1942 | |
6460e75a DG |
1943 | if (num == scatter_elem_sz_prev) { |
1944 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { | |
1945 | scatter_elem_sz = ret_sz; | |
1946 | scatter_elem_sz_prev = ret_sz; | |
1947 | } | |
1948 | } | |
d6b10348 | 1949 | |
95e159d6 HR |
1950 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
1951 | "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", | |
1952 | k, num, ret_sz)); | |
d6b10348 MC |
1953 | } /* end of for loop */ |
1954 | ||
10db10d1 | 1955 | schp->page_order = order; |
d6b10348 | 1956 | schp->k_use_sg = k; |
95e159d6 HR |
1957 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
1958 | "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", | |
1959 | k, rem_sz)); | |
d6b10348 MC |
1960 | |
1961 | schp->bufflen = blk_size; | |
1962 | if (rem_sz > 0) /* must have failed */ | |
1963 | return -ENOMEM; | |
1da177e4 | 1964 | return 0; |
10db10d1 FT |
1965 | out: |
1966 | for (i = 0; i < k; i++) | |
e71044ee | 1967 | __free_pages(schp->pages[i], order); |
10db10d1 FT |
1968 | |
1969 | if (--order >= 0) | |
1970 | goto retry; | |
1971 | ||
1972 | return -ENOMEM; | |
1da177e4 LT |
1973 | } |
1974 | ||
1da177e4 | 1975 | static void |
95e159d6 | 1976 | sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) |
1da177e4 | 1977 | { |
95e159d6 HR |
1978 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1979 | "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
10db10d1 | 1980 | if (schp->pages && schp->sglist_len > 0) { |
6e5a30cb | 1981 | if (!schp->dio_in_use) { |
1da177e4 LT |
1982 | int k; |
1983 | ||
10db10d1 | 1984 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
95e159d6 HR |
1985 | SCSI_LOG_TIMEOUT(5, |
1986 | sg_printk(KERN_INFO, sfp->parentdp, | |
1987 | "sg_remove_scat: k=%d, pg=0x%p\n", | |
1988 | k, schp->pages[k])); | |
10db10d1 | 1989 | __free_pages(schp->pages[k], schp->page_order); |
1da177e4 | 1990 | } |
6e5a30cb | 1991 | |
10db10d1 | 1992 | kfree(schp->pages); |
1da177e4 | 1993 | } |
d6b10348 | 1994 | } |
1da177e4 LT |
1995 | memset(schp, 0, sizeof (*schp)); |
1996 | } | |
1997 | ||
1da177e4 LT |
1998 | static int |
1999 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
2000 | { | |
2001 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 2002 | int k, num; |
1da177e4 | 2003 | |
95e159d6 HR |
2004 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
2005 | "sg_read_oxfer: num_read_xfer=%d\n", | |
2006 | num_read_xfer)); | |
1da177e4 LT |
2007 | if ((!outp) || (num_read_xfer <= 0)) |
2008 | return 0; | |
d6b10348 | 2009 | |
10db10d1 FT |
2010 | num = 1 << (PAGE_SHIFT + schp->page_order); |
2011 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { | |
d6b10348 | 2012 | if (num > num_read_xfer) { |
c8c12792 | 2013 | if (copy_to_user(outp, page_address(schp->pages[k]), |
d6b10348 MC |
2014 | num_read_xfer)) |
2015 | return -EFAULT; | |
2016 | break; | |
2017 | } else { | |
c8c12792 | 2018 | if (copy_to_user(outp, page_address(schp->pages[k]), |
d6b10348 MC |
2019 | num)) |
2020 | return -EFAULT; | |
2021 | num_read_xfer -= num; | |
2022 | if (num_read_xfer <= 0) | |
1da177e4 | 2023 | break; |
d6b10348 | 2024 | outp += num; |
1da177e4 | 2025 | } |
1da177e4 | 2026 | } |
d6b10348 | 2027 | |
1da177e4 LT |
2028 | return 0; |
2029 | } | |
2030 | ||
2031 | static void | |
2032 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
2033 | { | |
2034 | Sg_scatter_hold *schp = &sfp->reserve; | |
2035 | ||
95e159d6 HR |
2036 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
2037 | "sg_build_reserve: req_size=%d\n", req_size)); | |
1da177e4 LT |
2038 | do { |
2039 | if (req_size < PAGE_SIZE) | |
2040 | req_size = PAGE_SIZE; | |
2041 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
2042 | return; | |
2043 | else | |
95e159d6 | 2044 | sg_remove_scat(sfp, schp); |
1da177e4 LT |
2045 | req_size >>= 1; /* divide by 2 */ |
2046 | } while (req_size > (PAGE_SIZE / 2)); | |
2047 | } | |
2048 | ||
2049 | static void | |
2050 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
2051 | { | |
2052 | Sg_scatter_hold *req_schp = &srp->data; | |
2053 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
d6b10348 | 2054 | int k, num, rem; |
1da177e4 LT |
2055 | |
2056 | srp->res_used = 1; | |
95e159d6 HR |
2057 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
2058 | "sg_link_reserve: size=%d\n", size)); | |
eca7be5e | 2059 | rem = size; |
d6b10348 | 2060 | |
10db10d1 FT |
2061 | num = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
2062 | for (k = 0; k < rsv_schp->k_use_sg; k++) { | |
d6b10348 | 2063 | if (rem <= num) { |
d6b10348 MC |
2064 | req_schp->k_use_sg = k + 1; |
2065 | req_schp->sglist_len = rsv_schp->sglist_len; | |
10db10d1 | 2066 | req_schp->pages = rsv_schp->pages; |
d6b10348 MC |
2067 | |
2068 | req_schp->bufflen = size; | |
10db10d1 | 2069 | req_schp->page_order = rsv_schp->page_order; |
d6b10348 MC |
2070 | break; |
2071 | } else | |
2072 | rem -= num; | |
1da177e4 | 2073 | } |
d6b10348 MC |
2074 | |
2075 | if (k >= rsv_schp->k_use_sg) | |
95e159d6 HR |
2076 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
2077 | "sg_link_reserve: BAD size\n")); | |
1da177e4 LT |
2078 | } |
2079 | ||
2080 | static void | |
2081 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2082 | { | |
2083 | Sg_scatter_hold *req_schp = &srp->data; | |
1da177e4 | 2084 | |
95e159d6 HR |
2085 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
2086 | "sg_unlink_reserve: req->k_use_sg=%d\n", | |
2087 | (int) req_schp->k_use_sg)); | |
1da177e4 LT |
2088 | req_schp->k_use_sg = 0; |
2089 | req_schp->bufflen = 0; | |
10db10d1 FT |
2090 | req_schp->pages = NULL; |
2091 | req_schp->page_order = 0; | |
1da177e4 | 2092 | req_schp->sglist_len = 0; |
1da177e4 | 2093 | srp->res_used = 0; |
e791ce27 HR |
2094 | /* Called without mutex lock to avoid deadlock */ |
2095 | sfp->res_in_use = 0; | |
1da177e4 LT |
2096 | } |
2097 | ||
2098 | static Sg_request * | |
2099 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
2100 | { | |
2101 | Sg_request *resp; | |
2102 | unsigned long iflags; | |
2103 | ||
2104 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
109bade9 | 2105 | list_for_each_entry(resp, &sfp->rq_list, entry) { |
1da177e4 LT |
2106 | /* look for requests that are ready + not SG_IO owned */ |
2107 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
2108 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
2109 | resp->done = 2; /* guard against other readers */ | |
48ae8484 JT |
2110 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
2111 | return resp; | |
1da177e4 LT |
2112 | } |
2113 | } | |
2114 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
48ae8484 | 2115 | return NULL; |
1da177e4 LT |
2116 | } |
2117 | ||
1da177e4 LT |
2118 | /* always adds to end of list */ |
2119 | static Sg_request * | |
2120 | sg_add_request(Sg_fd * sfp) | |
2121 | { | |
2122 | int k; | |
2123 | unsigned long iflags; | |
1da177e4 LT |
2124 | Sg_request *rp = sfp->req_arr; |
2125 | ||
2126 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
109bade9 HR |
2127 | if (!list_empty(&sfp->rq_list)) { |
2128 | if (!sfp->cmd_q) | |
2129 | goto out_unlock; | |
2130 | ||
2131 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2132 | if (!rp->parentfp) | |
2133 | break; | |
1da177e4 | 2134 | } |
109bade9 HR |
2135 | if (k >= SG_MAX_QUEUE) |
2136 | goto out_unlock; | |
1da177e4 | 2137 | } |
109bade9 HR |
2138 | memset(rp, 0, sizeof (Sg_request)); |
2139 | rp->parentfp = sfp; | |
2140 | rp->header.duration = jiffies_to_msecs(jiffies); | |
2141 | list_add_tail(&rp->entry, &sfp->rq_list); | |
1da177e4 | 2142 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
109bade9 HR |
2143 | return rp; |
2144 | out_unlock: | |
2145 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2146 | return NULL; | |
1da177e4 LT |
2147 | } |
2148 | ||
2149 | /* Return of 1 for found; 0 for not found */ | |
2150 | static int | |
2151 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2152 | { | |
1da177e4 LT |
2153 | unsigned long iflags; |
2154 | int res = 0; | |
2155 | ||
109bade9 | 2156 | if (!sfp || !srp || list_empty(&sfp->rq_list)) |
1da177e4 LT |
2157 | return res; |
2158 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
109bade9 HR |
2159 | if (!list_empty(&srp->entry)) { |
2160 | list_del(&srp->entry); | |
2161 | srp->parentfp = NULL; | |
1da177e4 | 2162 | res = 1; |
1da177e4 LT |
2163 | } |
2164 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2165 | return res; | |
2166 | } | |
2167 | ||
1da177e4 | 2168 | static Sg_fd * |
95e159d6 | 2169 | sg_add_sfp(Sg_device * sdp) |
1da177e4 LT |
2170 | { |
2171 | Sg_fd *sfp; | |
2172 | unsigned long iflags; | |
44ec9542 | 2173 | int bufflen; |
1da177e4 | 2174 | |
d6b10348 | 2175 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
1da177e4 | 2176 | if (!sfp) |
cc833acb | 2177 | return ERR_PTR(-ENOMEM); |
d6b10348 | 2178 | |
1da177e4 LT |
2179 | init_waitqueue_head(&sfp->read_wait); |
2180 | rwlock_init(&sfp->rq_list_lock); | |
109bade9 | 2181 | INIT_LIST_HEAD(&sfp->rq_list); |
c6517b79 | 2182 | kref_init(&sfp->f_ref); |
1bc0eb04 | 2183 | mutex_init(&sfp->f_mutex); |
1da177e4 LT |
2184 | sfp->timeout = SG_DEFAULT_TIMEOUT; |
2185 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2186 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
1da177e4 LT |
2187 | sfp->cmd_q = SG_DEF_COMMAND_Q; |
2188 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2189 | sfp->parentdp = sdp; | |
cc833acb DG |
2190 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
2191 | if (atomic_read(&sdp->detaching)) { | |
2192 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
c170e5a8 | 2193 | kfree(sfp); |
cc833acb DG |
2194 | return ERR_PTR(-ENODEV); |
2195 | } | |
3442f802 | 2196 | list_add_tail(&sfp->sfd_siblings, &sdp->sfds); |
cc833acb | 2197 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
95e159d6 HR |
2198 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
2199 | "sg_add_sfp: sfp=0x%p\n", sfp)); | |
6460e75a DG |
2200 | if (unlikely(sg_big_buff != def_reserved_size)) |
2201 | sg_big_buff = def_reserved_size; | |
2202 | ||
44ec9542 | 2203 | bufflen = min_t(int, sg_big_buff, |
46f69e6a | 2204 | max_sectors_bytes(sdp->device->request_queue)); |
44ec9542 | 2205 | sg_build_reserve(sfp, bufflen); |
95e159d6 HR |
2206 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
2207 | "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", | |
2208 | sfp->reserve.bufflen, | |
2209 | sfp->reserve.k_use_sg)); | |
c6517b79 TB |
2210 | |
2211 | kref_get(&sdp->d_ref); | |
2212 | __module_get(THIS_MODULE); | |
1da177e4 LT |
2213 | return sfp; |
2214 | } | |
2215 | ||
cc833acb DG |
2216 | static void |
2217 | sg_remove_sfp_usercontext(struct work_struct *work) | |
1da177e4 | 2218 | { |
c6517b79 TB |
2219 | struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); |
2220 | struct sg_device *sdp = sfp->parentdp; | |
109bade9 | 2221 | Sg_request *srp; |
97d27b0d | 2222 | unsigned long iflags; |
c6517b79 TB |
2223 | |
2224 | /* Cleanup any responses which were never read(). */ | |
97d27b0d | 2225 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
109bade9 HR |
2226 | while (!list_empty(&sfp->rq_list)) { |
2227 | srp = list_first_entry(&sfp->rq_list, Sg_request, entry); | |
2228 | sg_finish_rem_req(srp); | |
97d27b0d HR |
2229 | list_del(&srp->entry); |
2230 | srp->parentfp = NULL; | |
109bade9 | 2231 | } |
97d27b0d | 2232 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
1da177e4 | 2233 | |
1da177e4 | 2234 | if (sfp->reserve.bufflen > 0) { |
95e159d6 HR |
2235 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
2236 | "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
c6517b79 TB |
2237 | (int) sfp->reserve.bufflen, |
2238 | (int) sfp->reserve.k_use_sg)); | |
95e159d6 | 2239 | sg_remove_scat(sfp, &sfp->reserve); |
1da177e4 | 2240 | } |
c6517b79 | 2241 | |
95e159d6 HR |
2242 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
2243 | "sg_remove_sfp: sfp=0x%p\n", sfp)); | |
d6b10348 | 2244 | kfree(sfp); |
c6517b79 TB |
2245 | |
2246 | scsi_device_put(sdp->device); | |
cc833acb | 2247 | kref_put(&sdp->d_ref, sg_device_destroy); |
c6517b79 | 2248 | module_put(THIS_MODULE); |
1da177e4 LT |
2249 | } |
2250 | ||
cc833acb DG |
2251 | static void |
2252 | sg_remove_sfp(struct kref *kref) | |
1da177e4 | 2253 | { |
c6517b79 | 2254 | struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); |
065b4a2f | 2255 | struct sg_device *sdp = sfp->parentdp; |
c6517b79 | 2256 | unsigned long iflags; |
1da177e4 | 2257 | |
cc833acb | 2258 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
3442f802 | 2259 | list_del(&sfp->sfd_siblings); |
cc833acb | 2260 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
1da177e4 | 2261 | |
015640ed FT |
2262 | INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); |
2263 | schedule_work(&sfp->ew.work); | |
1da177e4 LT |
2264 | } |
2265 | ||
1da177e4 | 2266 | #ifdef CONFIG_SCSI_PROC_FS |
7c07d613 JB |
2267 | static int |
2268 | sg_idr_max_id(int id, void *p, void *data) | |
2269 | { | |
2270 | int *k = data; | |
2271 | ||
2272 | if (*k < id) | |
2273 | *k = id; | |
2274 | ||
2275 | return 0; | |
2276 | } | |
2277 | ||
1da177e4 LT |
2278 | static int |
2279 | sg_last_dev(void) | |
2280 | { | |
53474c04 | 2281 | int k = -1; |
1da177e4 LT |
2282 | unsigned long iflags; |
2283 | ||
7c07d613 JB |
2284 | read_lock_irqsave(&sg_index_lock, iflags); |
2285 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); | |
2286 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 LT |
2287 | return k + 1; /* origin 1 */ |
2288 | } | |
2289 | #endif | |
2290 | ||
c6517b79 TB |
2291 | /* must be called with sg_index_lock held */ |
2292 | static Sg_device *sg_lookup_dev(int dev) | |
1da177e4 | 2293 | { |
c6517b79 TB |
2294 | return idr_find(&sg_index_idr, dev); |
2295 | } | |
1da177e4 | 2296 | |
cc833acb DG |
2297 | static Sg_device * |
2298 | sg_get_dev(int dev) | |
c6517b79 TB |
2299 | { |
2300 | struct sg_device *sdp; | |
2301 | unsigned long flags; | |
2302 | ||
2303 | read_lock_irqsave(&sg_index_lock, flags); | |
2304 | sdp = sg_lookup_dev(dev); | |
2305 | if (!sdp) | |
2306 | sdp = ERR_PTR(-ENXIO); | |
cc833acb DG |
2307 | else if (atomic_read(&sdp->detaching)) { |
2308 | /* If sdp->detaching, then the refcount may already be 0, in | |
c6517b79 TB |
2309 | * which case it would be a bug to do kref_get(). |
2310 | */ | |
2311 | sdp = ERR_PTR(-ENODEV); | |
2312 | } else | |
2313 | kref_get(&sdp->d_ref); | |
2314 | read_unlock_irqrestore(&sg_index_lock, flags); | |
7c07d613 | 2315 | |
1da177e4 LT |
2316 | return sdp; |
2317 | } | |
2318 | ||
2319 | #ifdef CONFIG_SCSI_PROC_FS | |
1da177e4 LT |
2320 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); |
2321 | ||
2322 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2323 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2324 | size_t count, loff_t *off); | |
97a32539 AD |
2325 | static const struct proc_ops adio_proc_ops = { |
2326 | .proc_open = sg_proc_single_open_adio, | |
2327 | .proc_read = seq_read, | |
2328 | .proc_lseek = seq_lseek, | |
2329 | .proc_write = sg_proc_write_adio, | |
2330 | .proc_release = single_release, | |
1da177e4 LT |
2331 | }; |
2332 | ||
2333 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2334 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2335 | const char __user *buffer, size_t count, loff_t *off); | |
97a32539 AD |
2336 | static const struct proc_ops dressz_proc_ops = { |
2337 | .proc_open = sg_proc_single_open_dressz, | |
2338 | .proc_read = seq_read, | |
2339 | .proc_lseek = seq_lseek, | |
2340 | .proc_write = sg_proc_write_dressz, | |
2341 | .proc_release = single_release, | |
1da177e4 LT |
2342 | }; |
2343 | ||
2344 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
1da177e4 | 2345 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); |
1da177e4 | 2346 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); |
1da177e4 LT |
2347 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); |
2348 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2349 | static void dev_seq_stop(struct seq_file *s, void *v); | |
88e9d34c | 2350 | static const struct seq_operations dev_seq_ops = { |
1da177e4 LT |
2351 | .start = dev_seq_start, |
2352 | .next = dev_seq_next, | |
2353 | .stop = dev_seq_stop, | |
2354 | .show = sg_proc_seq_show_dev, | |
2355 | }; | |
2356 | ||
2357 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
88e9d34c | 2358 | static const struct seq_operations devstrs_seq_ops = { |
1da177e4 LT |
2359 | .start = dev_seq_start, |
2360 | .next = dev_seq_next, | |
2361 | .stop = dev_seq_stop, | |
2362 | .show = sg_proc_seq_show_devstrs, | |
2363 | }; | |
2364 | ||
2365 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
88e9d34c | 2366 | static const struct seq_operations debug_seq_ops = { |
1da177e4 LT |
2367 | .start = dev_seq_start, |
2368 | .next = dev_seq_next, | |
2369 | .stop = dev_seq_stop, | |
2370 | .show = sg_proc_seq_show_debug, | |
2371 | }; | |
2372 | ||
1da177e4 LT |
2373 | static int |
2374 | sg_proc_init(void) | |
2375 | { | |
b8b1483d | 2376 | struct proc_dir_entry *p; |
1da177e4 | 2377 | |
b8b1483d CH |
2378 | p = proc_mkdir("scsi/sg", NULL); |
2379 | if (!p) | |
1da177e4 | 2380 | return 1; |
1da177e4 | 2381 | |
97a32539 | 2382 | proc_create("allow_dio", S_IRUGO | S_IWUSR, p, &adio_proc_ops); |
b8b1483d | 2383 | proc_create_seq("debug", S_IRUGO, p, &debug_seq_ops); |
97a32539 | 2384 | proc_create("def_reserved_size", S_IRUGO | S_IWUSR, p, &dressz_proc_ops); |
b8b1483d CH |
2385 | proc_create_single("device_hdr", S_IRUGO, p, sg_proc_seq_show_devhdr); |
2386 | proc_create_seq("devices", S_IRUGO, p, &dev_seq_ops); | |
2387 | proc_create_seq("device_strs", S_IRUGO, p, &devstrs_seq_ops); | |
2388 | proc_create_single("version", S_IRUGO, p, sg_proc_seq_show_version); | |
2389 | return 0; | |
1da177e4 LT |
2390 | } |
2391 | ||
2392 | ||
2393 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2394 | { | |
2395 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2396 | return 0; | |
2397 | } | |
2398 | ||
2399 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2400 | { | |
2401 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2402 | } | |
2403 | ||
2404 | static ssize_t | |
2405 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2406 | size_t count, loff_t *off) | |
2407 | { | |
7e95fffe SB |
2408 | int err; |
2409 | unsigned long num; | |
1da177e4 LT |
2410 | |
2411 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2412 | return -EACCES; | |
7e95fffe SB |
2413 | err = kstrtoul_from_user(buffer, count, 0, &num); |
2414 | if (err) | |
2415 | return err; | |
2416 | sg_allow_dio = num ? 1 : 0; | |
1da177e4 LT |
2417 | return count; |
2418 | } | |
2419 | ||
2420 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2421 | { | |
2422 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2423 | } | |
2424 | ||
2425 | static ssize_t | |
2426 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2427 | size_t count, loff_t *off) | |
2428 | { | |
7e95fffe | 2429 | int err; |
1da177e4 | 2430 | unsigned long k = ULONG_MAX; |
1da177e4 LT |
2431 | |
2432 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2433 | return -EACCES; | |
7e95fffe SB |
2434 | |
2435 | err = kstrtoul_from_user(buffer, count, 0, &k); | |
2436 | if (err) | |
2437 | return err; | |
1da177e4 LT |
2438 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ |
2439 | sg_big_buff = k; | |
2440 | return count; | |
2441 | } | |
2442 | return -ERANGE; | |
2443 | } | |
2444 | ||
2445 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2446 | { | |
2447 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2448 | sg_version_date); | |
2449 | return 0; | |
2450 | } | |
2451 | ||
1da177e4 LT |
2452 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) |
2453 | { | |
cc833acb | 2454 | seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); |
1da177e4 LT |
2455 | return 0; |
2456 | } | |
2457 | ||
1da177e4 LT |
2458 | struct sg_proc_deviter { |
2459 | loff_t index; | |
2460 | size_t max; | |
2461 | }; | |
2462 | ||
2463 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2464 | { | |
2465 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2466 | ||
729d70f5 | 2467 | s->private = it; |
1da177e4 LT |
2468 | if (! it) |
2469 | return NULL; | |
729d70f5 | 2470 | |
1da177e4 LT |
2471 | it->index = *pos; |
2472 | it->max = sg_last_dev(); | |
2473 | if (it->index >= it->max) | |
729d70f5 | 2474 | return NULL; |
1da177e4 | 2475 | return it; |
1da177e4 LT |
2476 | } |
2477 | ||
2478 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2479 | { | |
729d70f5 | 2480 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2481 | |
2482 | *pos = ++it->index; | |
2483 | return (it->index < it->max) ? it : NULL; | |
2484 | } | |
2485 | ||
2486 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2487 | { | |
729d70f5 | 2488 | kfree(s->private); |
1da177e4 LT |
2489 | } |
2490 | ||
1da177e4 LT |
2491 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) |
2492 | { | |
2493 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2494 | Sg_device *sdp; | |
2495 | struct scsi_device *scsidp; | |
c6517b79 | 2496 | unsigned long iflags; |
1da177e4 | 2497 | |
c6517b79 TB |
2498 | read_lock_irqsave(&sg_index_lock, iflags); |
2499 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
cc833acb DG |
2500 | if ((NULL == sdp) || (NULL == sdp->device) || |
2501 | (atomic_read(&sdp->detaching))) | |
2502 | seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
2503 | else { | |
2504 | scsidp = sdp->device; | |
9cb78c16 | 2505 | seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", |
1da177e4 LT |
2506 | scsidp->host->host_no, scsidp->channel, |
2507 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
2508 | 1, | |
2509 | (int) scsidp->queue_depth, | |
71e75c97 | 2510 | (int) atomic_read(&scsidp->device_busy), |
1da177e4 | 2511 | (int) scsi_device_online(scsidp)); |
cc833acb | 2512 | } |
c6517b79 | 2513 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2514 | return 0; |
2515 | } | |
2516 | ||
1da177e4 LT |
2517 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) |
2518 | { | |
2519 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2520 | Sg_device *sdp; | |
2521 | struct scsi_device *scsidp; | |
c6517b79 | 2522 | unsigned long iflags; |
1da177e4 | 2523 | |
c6517b79 TB |
2524 | read_lock_irqsave(&sg_index_lock, iflags); |
2525 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
cc833acb DG |
2526 | scsidp = sdp ? sdp->device : NULL; |
2527 | if (sdp && scsidp && (!atomic_read(&sdp->detaching))) | |
1da177e4 LT |
2528 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", |
2529 | scsidp->vendor, scsidp->model, scsidp->rev); | |
2530 | else | |
cc833acb | 2531 | seq_puts(s, "<no active device>\n"); |
c6517b79 | 2532 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2533 | return 0; |
2534 | } | |
2535 | ||
c0d3b9c2 | 2536 | /* must be called while holding sg_index_lock */ |
1da177e4 LT |
2537 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) |
2538 | { | |
109bade9 | 2539 | int k, new_interface, blen, usg; |
1da177e4 LT |
2540 | Sg_request *srp; |
2541 | Sg_fd *fp; | |
2542 | const sg_io_hdr_t *hp; | |
2543 | const char * cp; | |
cb59e840 | 2544 | unsigned int ms; |
1da177e4 | 2545 | |
3442f802 FT |
2546 | k = 0; |
2547 | list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { | |
2548 | k++; | |
c6517b79 | 2549 | read_lock(&fp->rq_list_lock); /* irqs already disabled */ |
1da177e4 | 2550 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " |
3442f802 | 2551 | "(res)sgat=%d low_dma=%d\n", k, |
1da177e4 LT |
2552 | jiffies_to_msecs(fp->timeout), |
2553 | fp->reserve.bufflen, | |
2554 | (int) fp->reserve.k_use_sg, | |
745dfa0d | 2555 | (int) sdp->device->host->unchecked_isa_dma); |
ebaf466b | 2556 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", |
1da177e4 | 2557 | (int) fp->cmd_q, (int) fp->force_packid, |
ebaf466b | 2558 | (int) fp->keep_orphan); |
109bade9 | 2559 | list_for_each_entry(srp, &fp->rq_list, entry) { |
1da177e4 LT |
2560 | hp = &srp->header; |
2561 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
2562 | if (srp->res_used) { | |
109bade9 | 2563 | if (new_interface && |
1da177e4 LT |
2564 | (SG_FLAG_MMAP_IO & hp->flags)) |
2565 | cp = " mmap>> "; | |
2566 | else | |
2567 | cp = " rb>> "; | |
2568 | } else { | |
2569 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
2570 | cp = " dio>> "; | |
2571 | else | |
2572 | cp = " "; | |
2573 | } | |
cc833acb | 2574 | seq_puts(s, cp); |
d6b10348 MC |
2575 | blen = srp->data.bufflen; |
2576 | usg = srp->data.k_use_sg; | |
cc833acb DG |
2577 | seq_puts(s, srp->done ? |
2578 | ((1 == srp->done) ? "rcv:" : "fin:") | |
2579 | : "act:"); | |
1da177e4 LT |
2580 | seq_printf(s, " id=%d blen=%d", |
2581 | srp->header.pack_id, blen); | |
2582 | if (srp->done) | |
2583 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 DG |
2584 | else { |
2585 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 2586 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 DG |
2587 | (new_interface ? hp->timeout : |
2588 | jiffies_to_msecs(fp->timeout)), | |
2589 | (ms > hp->duration ? ms - hp->duration : 0)); | |
2590 | } | |
1da177e4 LT |
2591 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
2592 | (int) srp->data.cmd_opcode); | |
2593 | } | |
109bade9 | 2594 | if (list_empty(&fp->rq_list)) |
cc833acb | 2595 | seq_puts(s, " No requests active\n"); |
c6517b79 | 2596 | read_unlock(&fp->rq_list_lock); |
1da177e4 LT |
2597 | } |
2598 | } | |
2599 | ||
1da177e4 LT |
2600 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) |
2601 | { | |
2602 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2603 | Sg_device *sdp; | |
c6517b79 | 2604 | unsigned long iflags; |
1da177e4 | 2605 | |
cc833acb DG |
2606 | if (it && (0 == it->index)) |
2607 | seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", | |
2608 | (int)it->max, sg_big_buff); | |
1da177e4 | 2609 | |
c6517b79 TB |
2610 | read_lock_irqsave(&sg_index_lock, iflags); |
2611 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
cc833acb DG |
2612 | if (NULL == sdp) |
2613 | goto skip; | |
2614 | read_lock(&sdp->sfd_lock); | |
2615 | if (!list_empty(&sdp->sfds)) { | |
c0d3b9c2 | 2616 | seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); |
cc833acb DG |
2617 | if (atomic_read(&sdp->detaching)) |
2618 | seq_puts(s, "detaching pending close "); | |
2619 | else if (sdp->device) { | |
2620 | struct scsi_device *scsidp = sdp->device; | |
2621 | ||
9cb78c16 | 2622 | seq_printf(s, "%d:%d:%d:%llu em=%d", |
cc833acb DG |
2623 | scsidp->host->host_no, |
2624 | scsidp->channel, scsidp->id, | |
2625 | scsidp->lun, | |
2626 | scsidp->host->hostt->emulated); | |
2627 | } | |
2628 | seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", | |
2629 | sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); | |
c0d3b9c2 | 2630 | sg_proc_debug_helper(s, sdp); |
1da177e4 | 2631 | } |
cc833acb DG |
2632 | read_unlock(&sdp->sfd_lock); |
2633 | skip: | |
c6517b79 | 2634 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2635 | return 0; |
2636 | } | |
2637 | ||
2638 | #endif /* CONFIG_SCSI_PROC_FS */ | |
2639 | ||
2640 | module_init(init_sg); | |
2641 | module_exit(exit_sg); |