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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> | |
b81e0c23 | 34 | #include <linux/major.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
1da177e4 LT |
36 | #include <linux/fcntl.h> |
37 | #include <linux/init.h> | |
38 | #include <linux/poll.h> | |
1da177e4 | 39 | #include <linux/moduleparam.h> |
1da177e4 | 40 | #include <linux/cdev.h> |
7c07d613 | 41 | #include <linux/idr.h> |
1da177e4 LT |
42 | #include <linux/seq_file.h> |
43 | #include <linux/blkdev.h> | |
44 | #include <linux/delay.h> | |
6da127ad | 45 | #include <linux/blktrace_api.h> |
c45d15d2 | 46 | #include <linux/mutex.h> |
cc833acb | 47 | #include <linux/atomic.h> |
2fe038e3 | 48 | #include <linux/ratelimit.h> |
e2e40f2c | 49 | #include <linux/uio.h> |
26b5b874 | 50 | #include <linux/cred.h> /* for sg_check_file_access() */ |
1da177e4 | 51 | |
53555fb7 BVA |
52 | #include <scsi/scsi.h> |
53 | #include <scsi/scsi_cmnd.h> | |
db9dff36 | 54 | #include <scsi/scsi_dbg.h> |
53555fb7 | 55 | #include <scsi/scsi_device.h> |
1da177e4 | 56 | #include <scsi/scsi_driver.h> |
53555fb7 BVA |
57 | #include <scsi/scsi_eh.h> |
58 | #include <scsi/scsi_host.h> | |
1da177e4 | 59 | #include <scsi/scsi_ioctl.h> |
53555fb7 | 60 | #include <scsi/scsi_tcq.h> |
1da177e4 LT |
61 | #include <scsi/sg.h> |
62 | ||
63 | #include "scsi_logging.h" | |
64 | ||
65 | #ifdef CONFIG_SCSI_PROC_FS | |
66 | #include <linux/proc_fs.h> | |
65c26a0f | 67 | static char *sg_version_date = "20140603"; |
1da177e4 LT |
68 | |
69 | static int sg_proc_init(void); | |
1da177e4 LT |
70 | #endif |
71 | ||
1da177e4 | 72 | #define SG_ALLOW_DIO_DEF 0 |
1da177e4 | 73 | |
37c918e0 | 74 | #define SG_MAX_DEVS (1 << MINORBITS) |
1da177e4 | 75 | |
65c26a0f DG |
76 | /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type |
77 | * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater | |
78 | * than 16 bytes are "variable length" whose length is a multiple of 4 | |
79 | */ | |
80 | #define SG_MAX_CDB_SIZE 252 | |
81 | ||
f8630bd7 | 82 | #define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) |
1da177e4 | 83 | |
26d1c80f | 84 | static int sg_big_buff = SG_DEF_RESERVED_SIZE; |
1da177e4 LT |
85 | /* N.B. This variable is readable and writeable via |
86 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer | |
87 | of this size (or less if there is not enough memory) will be reserved | |
88 | for use by this file descriptor. [Deprecated usage: this variable is also | |
89 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into | |
90 | the kernel (i.e. it is not a module).] */ | |
91 | static int def_reserved_size = -1; /* picks up init parameter */ | |
92 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; | |
93 | ||
6460e75a DG |
94 | static int scatter_elem_sz = SG_SCATTER_SZ; |
95 | static int scatter_elem_sz_prev = SG_SCATTER_SZ; | |
96 | ||
1da177e4 | 97 | #define SG_SECTOR_SZ 512 |
1da177e4 | 98 | |
2243acd5 GKH |
99 | static int sg_add_device(struct device *); |
100 | static void sg_remove_device(struct device *); | |
98481ff0 | 101 | |
7c07d613 | 102 | static DEFINE_IDR(sg_index_idr); |
c0d3b9c2 JB |
103 | static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock |
104 | file descriptor list for device */ | |
1da177e4 LT |
105 | |
106 | static struct class_interface sg_interface = { | |
cc833acb DG |
107 | .add_dev = sg_add_device, |
108 | .remove_dev = sg_remove_device, | |
1da177e4 LT |
109 | }; |
110 | ||
111 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
112 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
ea312552 | 113 | unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ |
1da177e4 | 114 | unsigned bufflen; /* Size of (aggregate) data buffer */ |
10db10d1 FT |
115 | struct page **pages; |
116 | int page_order; | |
1da177e4 LT |
117 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
118 | unsigned char cmd_opcode; /* first byte of command */ | |
119 | } Sg_scatter_hold; | |
120 | ||
121 | struct sg_device; /* forward declarations */ | |
122 | struct sg_fd; | |
123 | ||
124 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
109bade9 | 125 | struct list_head entry; /* list entry */ |
1da177e4 LT |
126 | struct sg_fd *parentfp; /* NULL -> not in use */ |
127 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
128 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
d6b10348 | 129 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
1da177e4 LT |
130 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
131 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
132 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
6acddc5e JE |
133 | /* done protected by rq_list_lock */ |
134 | char done; /* 0->before bh, 1->before read, 2->read */ | |
10865dfa | 135 | struct request *rq; |
6e5a30cb | 136 | struct bio *bio; |
c96952ed | 137 | struct execute_work ew; |
1da177e4 LT |
138 | } Sg_request; |
139 | ||
140 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
cc833acb | 141 | struct list_head sfd_siblings; /* protected by device's sfd_lock */ |
1da177e4 LT |
142 | struct sg_device *parentdp; /* owning device */ |
143 | wait_queue_head_t read_wait; /* queue read until command done */ | |
144 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
1bc0eb04 | 145 | struct mutex f_mutex; /* protect against changes in this fd */ |
1da177e4 LT |
146 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ |
147 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
148 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
109bade9 | 149 | struct list_head rq_list; /* head of request list */ |
1da177e4 LT |
150 | struct fasync_struct *async_qp; /* used by asynchronous notification */ |
151 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
1da177e4 | 152 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ |
1da177e4 | 153 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ |
65c26a0f | 154 | unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ |
1da177e4 LT |
155 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ |
156 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
1bc0eb04 | 157 | char res_in_use; /* 1 -> 'reserve' array in use */ |
c6517b79 TB |
158 | struct kref f_ref; |
159 | struct execute_work ew; | |
1da177e4 LT |
160 | } Sg_fd; |
161 | ||
162 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
163 | struct scsi_device *device; | |
cc833acb DG |
164 | wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ |
165 | struct mutex open_rel_lock; /* held when in open() or release() */ | |
1da177e4 | 166 | int sg_tablesize; /* adapter's max scatter-gather table size */ |
7c07d613 | 167 | u32 index; /* device index number */ |
3442f802 | 168 | struct list_head sfds; |
cc833acb DG |
169 | rwlock_t sfd_lock; /* protect access to sfd list */ |
170 | atomic_t detaching; /* 0->device usable, 1->device detaching */ | |
171 | bool exclude; /* 1->open(O_EXCL) succeeded and is active */ | |
172 | int open_cnt; /* count of opens (perhaps < num(sfds) ) */ | |
1da177e4 | 173 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ |
aebbb583 | 174 | char name[DISK_NAME_LEN]; |
1da177e4 | 175 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ |
c6517b79 | 176 | struct kref d_ref; |
1da177e4 LT |
177 | } Sg_device; |
178 | ||
d6b10348 | 179 | /* tasklet or soft irq callback */ |
de671d61 | 180 | static enum rq_end_io_ret sg_rq_end_io(struct request *rq, blk_status_t status); |
10865dfa | 181 | static int sg_start_req(Sg_request *srp, unsigned char *cmd); |
e7ee4cc0 | 182 | static int sg_finish_rem_req(Sg_request * srp); |
1da177e4 | 183 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); |
1da177e4 LT |
184 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, |
185 | Sg_request * srp); | |
0b07de85 AG |
186 | static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, |
187 | const char __user *buf, size_t count, int blocking, | |
a2dd3b4c | 188 | int read_only, int sg_io_owned, Sg_request **o_srp); |
1da177e4 LT |
189 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, |
190 | unsigned char *cmnd, int timeout, int blocking); | |
1da177e4 | 191 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); |
95e159d6 | 192 | static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp); |
1da177e4 LT |
193 | static void sg_build_reserve(Sg_fd * sfp, int req_size); |
194 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); | |
195 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); | |
95e159d6 | 196 | static Sg_fd *sg_add_sfp(Sg_device * sdp); |
c6517b79 | 197 | static void sg_remove_sfp(struct kref *); |
3455607f | 198 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id, bool *busy); |
1da177e4 LT |
199 | static Sg_request *sg_add_request(Sg_fd * sfp); |
200 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); | |
1da177e4 | 201 | static Sg_device *sg_get_dev(int dev); |
cc833acb | 202 | static void sg_device_destroy(struct kref *kref); |
1da177e4 | 203 | |
1da177e4 LT |
204 | #define SZ_SG_HEADER sizeof(struct sg_header) |
205 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
206 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
207 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
208 | ||
95e159d6 | 209 | #define sg_printk(prefix, sdp, fmt, a...) \ |
aebbb583 | 210 | sdev_prefix_printk(prefix, (sdp)->device, (sdp)->name, fmt, ##a) |
95e159d6 | 211 | |
26b5b874 JH |
212 | /* |
213 | * The SCSI interfaces that use read() and write() as an asynchronous variant of | |
214 | * ioctl(..., SG_IO, ...) are fundamentally unsafe, since there are lots of ways | |
215 | * to trigger read() and write() calls from various contexts with elevated | |
216 | * privileges. This can lead to kernel memory corruption (e.g. if these | |
217 | * interfaces are called through splice()) and privilege escalation inside | |
218 | * userspace (e.g. if a process with access to such a device passes a file | |
219 | * descriptor to a SUID binary as stdin/stdout/stderr). | |
220 | * | |
221 | * This function provides protection for the legacy API by restricting the | |
222 | * calling context. | |
223 | */ | |
224 | static int sg_check_file_access(struct file *filp, const char *caller) | |
225 | { | |
226 | if (filp->f_cred != current_real_cred()) { | |
227 | pr_err_once("%s: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", | |
228 | caller, task_tgid_vnr(current), current->comm); | |
229 | return -EPERM; | |
230 | } | |
26b5b874 JH |
231 | return 0; |
232 | } | |
233 | ||
14e507b8 FT |
234 | static int sg_allow_access(struct file *filp, unsigned char *cmd) |
235 | { | |
35df8397 | 236 | struct sg_fd *sfp = filp->private_data; |
14e507b8 FT |
237 | |
238 | if (sfp->parentdp->device->type == TYPE_SCANNER) | |
239 | return 0; | |
5f4eb9d5 | 240 | if (!scsi_cmd_allowed(cmd, filp->f_mode & FMODE_WRITE)) |
7353dc06 CH |
241 | return -EPERM; |
242 | return 0; | |
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; | |
3455607f | 447 | bool busy; |
1da177e4 | 448 | sg_io_hdr_t *hp; |
78ed001d AB |
449 | struct sg_header *old_hdr; |
450 | int retval; | |
1da177e4 | 451 | |
26b5b874 JH |
452 | /* |
453 | * This could cause a response to be stranded. Close the associated | |
454 | * file descriptor to free up any resources being held. | |
455 | */ | |
456 | retval = sg_check_file_access(filp, __func__); | |
457 | if (retval) | |
458 | return retval; | |
459 | ||
1da177e4 LT |
460 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
461 | return -ENXIO; | |
95e159d6 HR |
462 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
463 | "sg_read: count=%d\n", (int) count)); | |
d6b10348 | 464 | |
78ed001d AB |
465 | if (sfp->force_packid) |
466 | retval = get_sg_io_pack_id(&req_pack_id, buf, count); | |
467 | if (retval) | |
468 | return retval; | |
469 | ||
3455607f | 470 | srp = sg_get_rq_mark(sfp, req_pack_id, &busy); |
1da177e4 | 471 | if (!srp) { /* now wait on packet to arrive */ |
78ed001d AB |
472 | if (filp->f_flags & O_NONBLOCK) |
473 | return -EAGAIN; | |
3f0c6aba | 474 | retval = wait_event_interruptible(sfp->read_wait, |
3455607f TB |
475 | ((srp = sg_get_rq_mark(sfp, req_pack_id, &busy)) || |
476 | (!busy && atomic_read(&sdp->detaching)))); | |
477 | if (!srp) | |
478 | /* signal or detaching */ | |
479 | return retval ? retval : -ENODEV; | |
cb59e840 | 480 | } |
78ed001d AB |
481 | if (srp->header.interface_id != '\0') |
482 | return sg_new_read(sfp, buf, count, srp); | |
1da177e4 LT |
483 | |
484 | hp = &srp->header; | |
78ed001d AB |
485 | old_hdr = kzalloc(SZ_SG_HEADER, GFP_KERNEL); |
486 | if (!old_hdr) | |
487 | return -ENOMEM; | |
488 | ||
cb59e840 | 489 | old_hdr->reply_len = (int) hp->timeout; |
490 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
491 | old_hdr->pack_id = hp->pack_id; | |
492 | old_hdr->twelve_byte = | |
1da177e4 | 493 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 | 494 | old_hdr->target_status = hp->masked_status; |
495 | old_hdr->host_status = hp->host_status; | |
496 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 | 497 | if ((CHECK_CONDITION & hp->masked_status) || |
464a00c9 HR |
498 | (srp->sense_b[0] & 0x70) == 0x70) { |
499 | old_hdr->driver_status = DRIVER_SENSE; | |
cb59e840 | 500 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
501 | sizeof (old_hdr->sense_buffer)); | |
464a00c9 | 502 | } |
1da177e4 LT |
503 | switch (hp->host_status) { |
504 | /* This setup of 'result' is for backward compatibility and is best | |
505 | ignored by the user who should use target, host + driver status */ | |
506 | case DID_OK: | |
507 | case DID_PASSTHROUGH: | |
508 | case DID_SOFT_ERROR: | |
cb59e840 | 509 | old_hdr->result = 0; |
1da177e4 LT |
510 | break; |
511 | case DID_NO_CONNECT: | |
512 | case DID_BUS_BUSY: | |
513 | case DID_TIME_OUT: | |
cb59e840 | 514 | old_hdr->result = EBUSY; |
1da177e4 LT |
515 | break; |
516 | case DID_BAD_TARGET: | |
517 | case DID_ABORT: | |
518 | case DID_PARITY: | |
519 | case DID_RESET: | |
520 | case DID_BAD_INTR: | |
cb59e840 | 521 | old_hdr->result = EIO; |
1da177e4 LT |
522 | break; |
523 | case DID_ERROR: | |
cb59e840 | 524 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
525 | hp->masked_status == GOOD) ? 0 : EIO; |
526 | break; | |
527 | default: | |
cb59e840 | 528 | old_hdr->result = EIO; |
1da177e4 LT |
529 | break; |
530 | } | |
531 | ||
532 | /* Now copy the result back to the user buffer. */ | |
533 | if (count >= SZ_SG_HEADER) { | |
c8c12792 | 534 | if (copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
cb59e840 | 535 | retval = -EFAULT; |
536 | goto free_old_hdr; | |
537 | } | |
1da177e4 | 538 | buf += SZ_SG_HEADER; |
cb59e840 | 539 | if (count > old_hdr->reply_len) |
540 | count = old_hdr->reply_len; | |
1da177e4 | 541 | if (count > SZ_SG_HEADER) { |
cb59e840 | 542 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
543 | retval = -EFAULT; | |
544 | goto free_old_hdr; | |
545 | } | |
1da177e4 LT |
546 | } |
547 | } else | |
cb59e840 | 548 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 549 | sg_finish_rem_req(srp); |
97d27b0d | 550 | sg_remove_request(sfp, srp); |
cb59e840 | 551 | retval = count; |
552 | free_old_hdr: | |
c9475cb0 | 553 | kfree(old_hdr); |
cb59e840 | 554 | return retval; |
1da177e4 LT |
555 | } |
556 | ||
557 | static ssize_t | |
558 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
559 | { | |
560 | sg_io_hdr_t *hp = &srp->header; | |
3b524a68 | 561 | int err = 0, err2; |
1da177e4 LT |
562 | int len; |
563 | ||
78ed001d AB |
564 | if (in_compat_syscall()) { |
565 | if (count < sizeof(struct compat_sg_io_hdr)) { | |
566 | err = -EINVAL; | |
567 | goto err_out; | |
568 | } | |
569 | } else if (count < SZ_SG_IO_HDR) { | |
1da177e4 LT |
570 | err = -EINVAL; |
571 | goto err_out; | |
572 | } | |
573 | hp->sb_len_wr = 0; | |
574 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
575 | if ((CHECK_CONDITION & hp->masked_status) || | |
464a00c9 | 576 | (srp->sense_b[0] & 0x70) == 0x70) { |
d6b10348 | 577 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
1da177e4 LT |
578 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
579 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
580 | len = (len > sb_len) ? sb_len : len; | |
581 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
582 | err = -EFAULT; | |
583 | goto err_out; | |
584 | } | |
464a00c9 | 585 | hp->driver_status = DRIVER_SENSE; |
1da177e4 LT |
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; | |
83c6f239 WB |
688 | if (copy_from_user(cmnd, buf, cmd_size)) { |
689 | sg_remove_request(sfp, srp); | |
1da177e4 | 690 | return -EFAULT; |
83c6f239 | 691 | } |
1da177e4 LT |
692 | /* |
693 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
694 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
695 | * is a non-zero input_size, so emit a warning. | |
696 | */ | |
eaa3e22e | 697 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
28676d86 JT |
698 | printk_ratelimited(KERN_WARNING |
699 | "sg_write: data in/out %d/%d bytes " | |
700 | "for SCSI command 0x%x-- guessing " | |
701 | "data in;\n program %s not setting " | |
702 | "count and/or reply_len properly\n", | |
703 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
704 | input_size, (unsigned int) cmnd[0], | |
705 | current->comm); | |
eaa3e22e | 706 | } |
1da177e4 LT |
707 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
708 | return (k < 0) ? k : count; | |
709 | } | |
710 | ||
711 | static ssize_t | |
0b07de85 | 712 | sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, |
a2dd3b4c | 713 | size_t count, int blocking, int read_only, int sg_io_owned, |
0b07de85 | 714 | Sg_request **o_srp) |
1da177e4 LT |
715 | { |
716 | int k; | |
717 | Sg_request *srp; | |
718 | sg_io_hdr_t *hp; | |
65c26a0f | 719 | unsigned char cmnd[SG_MAX_CDB_SIZE]; |
1da177e4 LT |
720 | int timeout; |
721 | unsigned long ul_timeout; | |
722 | ||
723 | if (count < SZ_SG_IO_HDR) | |
724 | return -EINVAL; | |
1da177e4 LT |
725 | |
726 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
727 | if (!(srp = sg_add_request(sfp))) { | |
95e159d6 HR |
728 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
729 | "sg_new_write: queue full\n")); | |
1da177e4 LT |
730 | return -EDOM; |
731 | } | |
a2dd3b4c | 732 | srp->sg_io_owned = sg_io_owned; |
1da177e4 | 733 | hp = &srp->header; |
98aaaec4 | 734 | if (get_sg_io_hdr(hp, buf)) { |
1da177e4 LT |
735 | sg_remove_request(sfp, srp); |
736 | return -EFAULT; | |
737 | } | |
738 | if (hp->interface_id != 'S') { | |
739 | sg_remove_request(sfp, srp); | |
740 | return -ENOSYS; | |
741 | } | |
742 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
743 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
744 | sg_remove_request(sfp, srp); | |
745 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
746 | } | |
747 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
748 | sg_remove_request(sfp, srp); | |
749 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
750 | } | |
1bc0eb04 | 751 | if (sfp->res_in_use) { |
1da177e4 LT |
752 | sg_remove_request(sfp, srp); |
753 | return -EBUSY; /* reserve buffer already being used */ | |
754 | } | |
755 | } | |
756 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
757 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
758 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
759 | sg_remove_request(sfp, srp); | |
760 | return -EMSGSIZE; | |
761 | } | |
a62726cb | 762 | if (copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { |
1da177e4 LT |
763 | sg_remove_request(sfp, srp); |
764 | return -EFAULT; | |
765 | } | |
14e507b8 | 766 | if (read_only && sg_allow_access(file, cmnd)) { |
1da177e4 LT |
767 | sg_remove_request(sfp, srp); |
768 | return -EPERM; | |
769 | } | |
770 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
771 | if (k < 0) | |
772 | return k; | |
773 | if (o_srp) | |
774 | *o_srp = srp; | |
775 | return count; | |
776 | } | |
777 | ||
778 | static int | |
779 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
780 | unsigned char *cmnd, int timeout, int blocking) | |
781 | { | |
5af2e382 | 782 | int k, at_head; |
1da177e4 LT |
783 | Sg_device *sdp = sfp->parentdp; |
784 | sg_io_hdr_t *hp = &srp->header; | |
1da177e4 LT |
785 | |
786 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
787 | hp->status = 0; | |
788 | hp->masked_status = 0; | |
789 | hp->msg_status = 0; | |
790 | hp->info = 0; | |
791 | hp->host_status = 0; | |
792 | hp->driver_status = 0; | |
793 | hp->resid = 0; | |
95e159d6 HR |
794 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
795 | "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
796 | (int) cmnd[0], (int) hp->cmd_len)); | |
1da177e4 | 797 | |
849f8583 LB |
798 | if (hp->dxfer_len >= SZ_256M) { |
799 | sg_remove_request(sfp, srp); | |
28676d86 | 800 | return -EINVAL; |
849f8583 | 801 | } |
28676d86 | 802 | |
10865dfa FT |
803 | k = sg_start_req(srp, cmnd); |
804 | if (k) { | |
95e159d6 HR |
805 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
806 | "sg_common_write: start_req err=%d\n", k)); | |
1da177e4 | 807 | sg_finish_rem_req(srp); |
97d27b0d | 808 | sg_remove_request(sfp, srp); |
1da177e4 LT |
809 | return k; /* probably out of space --> ENOMEM */ |
810 | } | |
cc833acb | 811 | if (atomic_read(&sdp->detaching)) { |
f3951a37 | 812 | if (srp->bio) { |
0bf6d96c | 813 | blk_mq_free_request(srp->rq); |
f3951a37 CO |
814 | srp->rq = NULL; |
815 | } | |
816 | ||
1da177e4 | 817 | sg_finish_rem_req(srp); |
97d27b0d | 818 | sg_remove_request(sfp, srp); |
1da177e4 LT |
819 | return -ENODEV; |
820 | } | |
1da177e4 | 821 | |
cb59e840 | 822 | hp->duration = jiffies_to_msecs(jiffies); |
16070cc1 DG |
823 | if (hp->interface_id != '\0' && /* v3 (or later) interface */ |
824 | (SG_FLAG_Q_AT_TAIL & hp->flags)) | |
825 | at_head = 0; | |
826 | else | |
827 | at_head = 1; | |
10db10d1 FT |
828 | |
829 | srp->rq->timeout = timeout; | |
c6517b79 | 830 | kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ |
e2e53086 CH |
831 | srp->rq->end_io = sg_rq_end_io; |
832 | blk_execute_rq_nowait(srp->rq, at_head); | |
10db10d1 | 833 | return 0; |
1da177e4 LT |
834 | } |
835 | ||
6acddc5e JE |
836 | static int srp_done(Sg_fd *sfp, Sg_request *srp) |
837 | { | |
838 | unsigned long flags; | |
839 | int ret; | |
840 | ||
841 | read_lock_irqsave(&sfp->rq_list_lock, flags); | |
842 | ret = srp->done; | |
843 | read_unlock_irqrestore(&sfp->rq_list_lock, flags); | |
844 | return ret; | |
845 | } | |
846 | ||
46f69e6a AM |
847 | static int max_sectors_bytes(struct request_queue *q) |
848 | { | |
849 | unsigned int max_sectors = queue_max_sectors(q); | |
850 | ||
851 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); | |
852 | ||
853 | return max_sectors << 9; | |
854 | } | |
855 | ||
4759df90 HR |
856 | static void |
857 | sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo) | |
858 | { | |
859 | Sg_request *srp; | |
860 | int val; | |
861 | unsigned int ms; | |
862 | ||
863 | val = 0; | |
864 | list_for_each_entry(srp, &sfp->rq_list, entry) { | |
587c3c9f | 865 | if (val >= SG_MAX_QUEUE) |
4759df90 | 866 | break; |
4759df90 HR |
867 | rinfo[val].req_state = srp->done + 1; |
868 | rinfo[val].problem = | |
869 | srp->header.masked_status & | |
870 | srp->header.host_status & | |
871 | srp->header.driver_status; | |
872 | if (srp->done) | |
873 | rinfo[val].duration = | |
874 | srp->header.duration; | |
875 | else { | |
876 | ms = jiffies_to_msecs(jiffies); | |
877 | rinfo[val].duration = | |
878 | (ms > srp->header.duration) ? | |
879 | (ms - srp->header.duration) : 0; | |
880 | } | |
881 | rinfo[val].orphan = srp->orphan; | |
882 | rinfo[val].sg_io_owned = srp->sg_io_owned; | |
883 | rinfo[val].pack_id = srp->header.pack_id; | |
884 | rinfo[val].usr_ptr = srp->header.usr_ptr; | |
885 | val++; | |
886 | } | |
887 | } | |
888 | ||
fd6c3d5a AB |
889 | #ifdef CONFIG_COMPAT |
890 | struct compat_sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */ | |
891 | char req_state; | |
892 | char orphan; | |
893 | char sg_io_owned; | |
894 | char problem; | |
895 | int pack_id; | |
896 | compat_uptr_t usr_ptr; | |
897 | unsigned int duration; | |
898 | int unused; | |
899 | }; | |
900 | ||
901 | static int put_compat_request_table(struct compat_sg_req_info __user *o, | |
902 | struct sg_req_info *rinfo) | |
903 | { | |
904 | int i; | |
905 | for (i = 0; i < SG_MAX_QUEUE; i++) { | |
906 | if (copy_to_user(o + i, rinfo + i, offsetof(sg_req_info_t, usr_ptr)) || | |
907 | put_user((uintptr_t)rinfo[i].usr_ptr, &o[i].usr_ptr) || | |
908 | put_user(rinfo[i].duration, &o[i].duration) || | |
909 | put_user(rinfo[i].unused, &o[i].unused)) | |
910 | return -EFAULT; | |
911 | } | |
912 | return 0; | |
913 | } | |
914 | #endif | |
915 | ||
37b9d1e0 | 916 | static long |
d320a955 AB |
917 | sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp, |
918 | unsigned int cmd_in, void __user *p) | |
1da177e4 | 919 | { |
1da177e4 | 920 | int __user *ip = p; |
176aa9d6 | 921 | int result, val, read_only; |
1da177e4 LT |
922 | Sg_request *srp; |
923 | unsigned long iflags; | |
924 | ||
95e159d6 HR |
925 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
926 | "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); | |
1da177e4 LT |
927 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); |
928 | ||
929 | switch (cmd_in) { | |
930 | case SG_IO: | |
cc833acb | 931 | if (atomic_read(&sdp->detaching)) |
dddbf8d9 JE |
932 | return -ENODEV; |
933 | if (!scsi_block_when_processing_errors(sdp->device)) | |
934 | return -ENXIO; | |
dddbf8d9 JE |
935 | result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, |
936 | 1, read_only, 1, &srp); | |
937 | if (result < 0) | |
938 | return result; | |
3f0c6aba | 939 | result = wait_event_interruptible(sfp->read_wait, |
3455607f | 940 | srp_done(sfp, srp)); |
794c10fa JE |
941 | write_lock_irq(&sfp->rq_list_lock); |
942 | if (srp->done) { | |
943 | srp->done = 2; | |
dddbf8d9 | 944 | write_unlock_irq(&sfp->rq_list_lock); |
794c10fa JE |
945 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); |
946 | return (result < 0) ? result : 0; | |
1da177e4 | 947 | } |
794c10fa JE |
948 | srp->orphan = 1; |
949 | write_unlock_irq(&sfp->rq_list_lock); | |
950 | return result; /* -ERESTARTSYS because signal hit process */ | |
1da177e4 LT |
951 | case SG_SET_TIMEOUT: |
952 | result = get_user(val, ip); | |
953 | if (result) | |
954 | return result; | |
955 | if (val < 0) | |
956 | return -EIO; | |
f8630bd7 PB |
957 | if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ)) |
958 | val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ), | |
b9b6e80a | 959 | INT_MAX); |
1da177e4 | 960 | sfp->timeout_user = val; |
f8630bd7 | 961 | sfp->timeout = mult_frac(val, HZ, USER_HZ); |
1da177e4 LT |
962 | |
963 | return 0; | |
964 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
965 | /* strange ..., for backward compatibility */ | |
966 | return sfp->timeout_user; | |
967 | case SG_SET_FORCE_LOW_DMA: | |
745dfa0d HR |
968 | /* |
969 | * N.B. This ioctl never worked properly, but failed to | |
970 | * return an error value. So returning '0' to keep compability | |
971 | * with legacy applications. | |
972 | */ | |
1da177e4 LT |
973 | return 0; |
974 | case SG_GET_LOW_DMA: | |
aaff5eba | 975 | return put_user(0, ip); |
1da177e4 | 976 | case SG_GET_SCSI_ID: |
a16a4741 AV |
977 | { |
978 | sg_scsi_id_t v; | |
1da177e4 | 979 | |
cc833acb | 980 | if (atomic_read(&sdp->detaching)) |
1da177e4 | 981 | return -ENODEV; |
a16a4741 AV |
982 | memset(&v, 0, sizeof(v)); |
983 | v.host_no = sdp->device->host->host_no; | |
984 | v.channel = sdp->device->channel; | |
985 | v.scsi_id = sdp->device->id; | |
986 | v.lun = sdp->device->lun; | |
987 | v.scsi_type = sdp->device->type; | |
988 | v.h_cmd_per_lun = sdp->device->host->cmd_per_lun; | |
989 | v.d_queue_depth = sdp->device->queue_depth; | |
990 | if (copy_to_user(p, &v, sizeof(sg_scsi_id_t))) | |
991 | return -EFAULT; | |
1da177e4 LT |
992 | return 0; |
993 | } | |
994 | case SG_SET_FORCE_PACK_ID: | |
995 | result = get_user(val, ip); | |
996 | if (result) | |
997 | return result; | |
998 | sfp->force_packid = val ? 1 : 0; | |
999 | return 0; | |
1000 | case SG_GET_PACK_ID: | |
1da177e4 | 1001 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
109bade9 | 1002 | list_for_each_entry(srp, &sfp->rq_list, entry) { |
1da177e4 LT |
1003 | if ((1 == srp->done) && (!srp->sg_io_owned)) { |
1004 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
1005 | iflags); | |
a16a4741 | 1006 | return put_user(srp->header.pack_id, ip); |
1da177e4 LT |
1007 | } |
1008 | } | |
1009 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
a16a4741 | 1010 | return put_user(-1, ip); |
1da177e4 LT |
1011 | case SG_GET_NUM_WAITING: |
1012 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
109bade9 HR |
1013 | val = 0; |
1014 | list_for_each_entry(srp, &sfp->rq_list, entry) { | |
1da177e4 LT |
1015 | if ((1 == srp->done) && (!srp->sg_io_owned)) |
1016 | ++val; | |
1017 | } | |
1018 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1019 | return put_user(val, ip); | |
1020 | case SG_GET_SG_TABLESIZE: | |
1021 | return put_user(sdp->sg_tablesize, ip); | |
1022 | case SG_SET_RESERVED_SIZE: | |
1023 | result = get_user(val, ip); | |
1024 | if (result) | |
1025 | return result; | |
1026 | if (val < 0) | |
1027 | return -EINVAL; | |
44ec9542 | 1028 | val = min_t(int, val, |
46f69e6a | 1029 | max_sectors_bytes(sdp->device->request_queue)); |
1bc0eb04 | 1030 | mutex_lock(&sfp->f_mutex); |
1da177e4 | 1031 | if (val != sfp->reserve.bufflen) { |
1bc0eb04 HR |
1032 | if (sfp->mmap_called || |
1033 | sfp->res_in_use) { | |
1034 | mutex_unlock(&sfp->f_mutex); | |
1da177e4 | 1035 | return -EBUSY; |
1bc0eb04 HR |
1036 | } |
1037 | ||
95e159d6 | 1038 | sg_remove_scat(sfp, &sfp->reserve); |
1da177e4 LT |
1039 | sg_build_reserve(sfp, val); |
1040 | } | |
1bc0eb04 | 1041 | mutex_unlock(&sfp->f_mutex); |
1da177e4 LT |
1042 | return 0; |
1043 | case SG_GET_RESERVED_SIZE: | |
44ec9542 | 1044 | val = min_t(int, sfp->reserve.bufflen, |
46f69e6a | 1045 | max_sectors_bytes(sdp->device->request_queue)); |
1da177e4 LT |
1046 | return put_user(val, ip); |
1047 | case SG_SET_COMMAND_Q: | |
1048 | result = get_user(val, ip); | |
1049 | if (result) | |
1050 | return result; | |
1051 | sfp->cmd_q = val ? 1 : 0; | |
1052 | return 0; | |
1053 | case SG_GET_COMMAND_Q: | |
1054 | return put_user((int) sfp->cmd_q, ip); | |
1055 | case SG_SET_KEEP_ORPHAN: | |
1056 | result = get_user(val, ip); | |
1057 | if (result) | |
1058 | return result; | |
1059 | sfp->keep_orphan = val; | |
1060 | return 0; | |
1061 | case SG_GET_KEEP_ORPHAN: | |
1062 | return put_user((int) sfp->keep_orphan, ip); | |
1063 | case SG_NEXT_CMD_LEN: | |
1064 | result = get_user(val, ip); | |
1065 | if (result) | |
1066 | return result; | |
bf33f87d | 1067 | if (val > SG_MAX_CDB_SIZE) |
1068 | return -ENOMEM; | |
1da177e4 LT |
1069 | sfp->next_cmd_len = (val > 0) ? val : 0; |
1070 | return 0; | |
1071 | case SG_GET_VERSION_NUM: | |
1072 | return put_user(sg_version_num, ip); | |
1073 | case SG_GET_ACCESS_COUNT: | |
1074 | /* faked - we don't have a real access count anymore */ | |
1075 | val = (sdp->device ? 1 : 0); | |
1076 | return put_user(val, ip); | |
1077 | case SG_GET_REQUEST_TABLE: | |
fd6c3d5a | 1078 | { |
cb59e840 | 1079 | sg_req_info_t *rinfo; |
cb59e840 | 1080 | |
6396bb22 | 1081 | rinfo = kcalloc(SG_MAX_QUEUE, SZ_SG_REQ_INFO, |
3e009749 | 1082 | GFP_KERNEL); |
cb59e840 | 1083 | if (!rinfo) |
1084 | return -ENOMEM; | |
1da177e4 | 1085 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
4759df90 | 1086 | sg_fill_request_table(sfp, rinfo); |
1da177e4 | 1087 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
fd6c3d5a AB |
1088 | #ifdef CONFIG_COMPAT |
1089 | if (in_compat_syscall()) | |
1090 | result = put_compat_request_table(p, rinfo); | |
1091 | else | |
1092 | #endif | |
1093 | result = copy_to_user(p, rinfo, | |
1094 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
cb59e840 | 1095 | result = result ? -EFAULT : 0; |
1096 | kfree(rinfo); | |
1097 | return result; | |
1da177e4 LT |
1098 | } |
1099 | case SG_EMULATED_HOST: | |
cc833acb | 1100 | if (atomic_read(&sdp->detaching)) |
1da177e4 LT |
1101 | return -ENODEV; |
1102 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1da177e4 | 1103 | case SCSI_IOCTL_SEND_COMMAND: |
cc833acb | 1104 | if (atomic_read(&sdp->detaching)) |
1da177e4 | 1105 | return -ENODEV; |
2e80089c CH |
1106 | return scsi_ioctl(sdp->device, filp->f_mode & FMODE_WRITE, |
1107 | cmd_in, p); | |
1da177e4 LT |
1108 | case SG_SET_DEBUG: |
1109 | result = get_user(val, ip); | |
1110 | if (result) | |
1111 | return result; | |
1112 | sdp->sgdebug = (char) val; | |
1113 | return 0; | |
44ec9542 | 1114 | case BLKSECTGET: |
46f69e6a | 1115 | return put_user(max_sectors_bytes(sdp->device->request_queue), |
44ec9542 | 1116 | ip); |
6da127ad | 1117 | case BLKTRACESETUP: |
1d1cf156 | 1118 | return blk_trace_setup(sdp->device->request_queue, sdp->name, |
76e3a19d | 1119 | MKDEV(SCSI_GENERIC_MAJOR, sdp->index), |
7475c8ae | 1120 | NULL, p); |
6da127ad CS |
1121 | case BLKTRACESTART: |
1122 | return blk_trace_startstop(sdp->device->request_queue, 1); | |
1123 | case BLKTRACESTOP: | |
1124 | return blk_trace_startstop(sdp->device->request_queue, 0); | |
1125 | case BLKTRACETEARDOWN: | |
1126 | return blk_trace_remove(sdp->device->request_queue); | |
906d15fb CH |
1127 | case SCSI_IOCTL_GET_IDLUN: |
1128 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1129 | case SCSI_IOCTL_PROBE_HOST: | |
1130 | case SG_GET_TRANSFORM: | |
1131 | case SG_SCSI_RESET: | |
1132 | if (atomic_read(&sdp->detaching)) | |
1133 | return -ENODEV; | |
1134 | break; | |
1da177e4 LT |
1135 | default: |
1136 | if (read_only) | |
1137 | return -EPERM; /* don't know so take safe approach */ | |
906d15fb | 1138 | break; |
1da177e4 | 1139 | } |
906d15fb CH |
1140 | |
1141 | result = scsi_ioctl_block_when_processing_errors(sdp->device, | |
1142 | cmd_in, filp->f_flags & O_NDELAY); | |
1143 | if (result) | |
1144 | return result; | |
d320a955 AB |
1145 | |
1146 | return -ENOIOCTLCMD; | |
1147 | } | |
1148 | ||
1149 | static long | |
1150 | sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1151 | { | |
1152 | void __user *p = (void __user *)arg; | |
1153 | Sg_device *sdp; | |
1154 | Sg_fd *sfp; | |
1155 | int ret; | |
1156 | ||
1157 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1158 | return -ENXIO; | |
1159 | ||
1160 | ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p); | |
1161 | if (ret != -ENOIOCTLCMD) | |
1162 | return ret; | |
2e80089c | 1163 | return scsi_ioctl(sdp->device, filp->f_mode & FMODE_WRITE, cmd_in, p); |
1da177e4 | 1164 | } |
1da177e4 | 1165 | |
afc9a42b | 1166 | static __poll_t |
1da177e4 LT |
1167 | sg_poll(struct file *filp, poll_table * wait) |
1168 | { | |
afc9a42b | 1169 | __poll_t res = 0; |
1da177e4 LT |
1170 | Sg_device *sdp; |
1171 | Sg_fd *sfp; | |
1172 | Sg_request *srp; | |
1173 | int count = 0; | |
1174 | unsigned long iflags; | |
1175 | ||
ebaf466b JE |
1176 | sfp = filp->private_data; |
1177 | if (!sfp) | |
a9a08845 | 1178 | return EPOLLERR; |
ebaf466b JE |
1179 | sdp = sfp->parentdp; |
1180 | if (!sdp) | |
a9a08845 | 1181 | return EPOLLERR; |
1da177e4 LT |
1182 | poll_wait(filp, &sfp->read_wait, wait); |
1183 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
109bade9 | 1184 | list_for_each_entry(srp, &sfp->rq_list, entry) { |
1da177e4 LT |
1185 | /* if any read waiting, flag it */ |
1186 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
a9a08845 | 1187 | res = EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
1188 | ++count; |
1189 | } | |
1190 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1191 | ||
cc833acb | 1192 | if (atomic_read(&sdp->detaching)) |
a9a08845 | 1193 | res |= EPOLLHUP; |
1da177e4 LT |
1194 | else if (!sfp->cmd_q) { |
1195 | if (0 == count) | |
a9a08845 | 1196 | res |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 1197 | } else if (count < SG_MAX_QUEUE) |
a9a08845 | 1198 | res |= EPOLLOUT | EPOLLWRNORM; |
95e159d6 | 1199 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
fcc5a652 | 1200 | "sg_poll: res=0x%x\n", (__force u32) res)); |
1da177e4 LT |
1201 | return res; |
1202 | } | |
1203 | ||
1204 | static int | |
1205 | sg_fasync(int fd, struct file *filp, int mode) | |
1206 | { | |
1da177e4 LT |
1207 | Sg_device *sdp; |
1208 | Sg_fd *sfp; | |
1209 | ||
1210 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1211 | return -ENXIO; | |
95e159d6 HR |
1212 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
1213 | "sg_fasync: mode=%d\n", mode)); | |
1da177e4 | 1214 | |
60aa4924 | 1215 | return fasync_helper(fd, filp, mode, &sfp->async_qp); |
1da177e4 LT |
1216 | } |
1217 | ||
0cac8e1b | 1218 | static vm_fault_t |
11bac800 | 1219 | sg_vma_fault(struct vm_fault *vmf) |
1da177e4 | 1220 | { |
11bac800 | 1221 | struct vm_area_struct *vma = vmf->vma; |
1da177e4 | 1222 | Sg_fd *sfp; |
d6b10348 | 1223 | unsigned long offset, len, sa; |
1da177e4 | 1224 | Sg_scatter_hold *rsv_schp; |
10db10d1 | 1225 | int k, length; |
1da177e4 LT |
1226 | |
1227 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
a13ff0bb | 1228 | return VM_FAULT_SIGBUS; |
1da177e4 | 1229 | rsv_schp = &sfp->reserve; |
a13ff0bb | 1230 | offset = vmf->pgoff << PAGE_SHIFT; |
1da177e4 | 1231 | if (offset >= rsv_schp->bufflen) |
a13ff0bb | 1232 | return VM_FAULT_SIGBUS; |
95e159d6 HR |
1233 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
1234 | "sg_vma_fault: offset=%lu, scatg=%d\n", | |
1235 | offset, rsv_schp->k_use_sg)); | |
d6b10348 | 1236 | sa = vma->vm_start; |
10db10d1 FT |
1237 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1238 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
d6b10348 | 1239 | len = vma->vm_end - sa; |
10db10d1 | 1240 | len = (len < length) ? len : length; |
d6b10348 | 1241 | if (offset < len) { |
10db10d1 FT |
1242 | struct page *page = nth_page(rsv_schp->pages[k], |
1243 | offset >> PAGE_SHIFT); | |
d6b10348 | 1244 | get_page(page); /* increment page count */ |
a13ff0bb NP |
1245 | vmf->page = page; |
1246 | return 0; /* success */ | |
1da177e4 | 1247 | } |
d6b10348 MC |
1248 | sa += len; |
1249 | offset -= len; | |
1da177e4 | 1250 | } |
d6b10348 | 1251 | |
a13ff0bb | 1252 | return VM_FAULT_SIGBUS; |
1da177e4 LT |
1253 | } |
1254 | ||
f0f37e2f | 1255 | static const struct vm_operations_struct sg_mmap_vm_ops = { |
a13ff0bb | 1256 | .fault = sg_vma_fault, |
1da177e4 LT |
1257 | }; |
1258 | ||
1259 | static int | |
1260 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1261 | { | |
1262 | Sg_fd *sfp; | |
d6b10348 | 1263 | unsigned long req_sz, len, sa; |
1da177e4 | 1264 | Sg_scatter_hold *rsv_schp; |
10db10d1 | 1265 | int k, length; |
6a8dadcc | 1266 | int ret = 0; |
1da177e4 LT |
1267 | |
1268 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1269 | return -ENXIO; | |
cb59e840 | 1270 | req_sz = vma->vm_end - vma->vm_start; |
95e159d6 HR |
1271 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
1272 | "sg_mmap starting, vm_start=%p, len=%d\n", | |
1273 | (void *) vma->vm_start, (int) req_sz)); | |
1da177e4 LT |
1274 | if (vma->vm_pgoff) |
1275 | return -EINVAL; /* want no offset */ | |
1276 | rsv_schp = &sfp->reserve; | |
6a8dadcc TP |
1277 | mutex_lock(&sfp->f_mutex); |
1278 | if (req_sz > rsv_schp->bufflen) { | |
1279 | ret = -ENOMEM; /* cannot map more than reserved buffer */ | |
1280 | goto out; | |
1281 | } | |
1da177e4 | 1282 | |
d6b10348 | 1283 | sa = vma->vm_start; |
10db10d1 FT |
1284 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1285 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
d6b10348 | 1286 | len = vma->vm_end - sa; |
10db10d1 | 1287 | len = (len < length) ? len : length; |
d6b10348 | 1288 | sa += len; |
1da177e4 | 1289 | } |
d6b10348 | 1290 | |
f9aed0e2 | 1291 | sfp->mmap_called = 1; |
1c71222e | 1292 | vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP); |
1da177e4 LT |
1293 | vma->vm_private_data = sfp; |
1294 | vma->vm_ops = &sg_mmap_vm_ops; | |
6a8dadcc TP |
1295 | out: |
1296 | mutex_unlock(&sfp->f_mutex); | |
1297 | return ret; | |
1da177e4 LT |
1298 | } |
1299 | ||
cc833acb DG |
1300 | static void |
1301 | sg_rq_end_io_usercontext(struct work_struct *work) | |
c96952ed FT |
1302 | { |
1303 | struct sg_request *srp = container_of(work, struct sg_request, ew.work); | |
1304 | struct sg_fd *sfp = srp->parentfp; | |
1305 | ||
1306 | sg_finish_rem_req(srp); | |
97d27b0d | 1307 | sg_remove_request(sfp, srp); |
c96952ed FT |
1308 | kref_put(&sfp->f_ref, sg_remove_sfp); |
1309 | } | |
1310 | ||
a91a3a20 FT |
1311 | /* |
1312 | * This function is a "bottom half" handler that is called by the mid | |
1313 | * level when a command is completed (or has failed). | |
1314 | */ | |
de671d61 | 1315 | static enum rq_end_io_ret |
2a842aca | 1316 | sg_rq_end_io(struct request *rq, blk_status_t status) |
1da177e4 | 1317 | { |
5b794f98 | 1318 | struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq); |
a91a3a20 | 1319 | struct sg_request *srp = rq->end_io_data; |
c6517b79 | 1320 | Sg_device *sdp; |
1da177e4 | 1321 | Sg_fd *sfp; |
1da177e4 | 1322 | unsigned long iflags; |
cb59e840 | 1323 | unsigned int ms; |
a91a3a20 | 1324 | char *sense; |
c6517b79 | 1325 | int result, resid, done = 1; |
1da177e4 | 1326 | |
c6517b79 | 1327 | if (WARN_ON(srp->done != 0)) |
de671d61 | 1328 | return RQ_END_IO_NONE; |
c6517b79 | 1329 | |
1da177e4 | 1330 | sfp = srp->parentfp; |
c6517b79 | 1331 | if (WARN_ON(sfp == NULL)) |
de671d61 | 1332 | return RQ_END_IO_NONE; |
c6517b79 TB |
1333 | |
1334 | sdp = sfp->parentdp; | |
cc833acb DG |
1335 | if (unlikely(atomic_read(&sdp->detaching))) |
1336 | pr_info("%s: device detaching\n", __func__); | |
1da177e4 | 1337 | |
5b794f98 | 1338 | sense = scmd->sense_buffer; |
dbb4c84d | 1339 | result = scmd->result; |
a9a4ea11 | 1340 | resid = scmd->resid_len; |
1da177e4 | 1341 | |
95e159d6 HR |
1342 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
1343 | "sg_cmd_done: pack_id=%d, res=0x%x\n", | |
1344 | srp->header.pack_id, result)); | |
d6b10348 | 1345 | srp->header.resid = resid; |
cb59e840 | 1346 | ms = jiffies_to_msecs(jiffies); |
1347 | srp->header.duration = (ms > srp->header.duration) ? | |
1348 | (ms - srp->header.duration) : 0; | |
d6b10348 | 1349 | if (0 != result) { |
1da177e4 LT |
1350 | struct scsi_sense_hdr sshdr; |
1351 | ||
d6b10348 | 1352 | srp->header.status = 0xff & result; |
c9293c11 | 1353 | srp->header.masked_status = sg_status_byte(result); |
54cf31d0 | 1354 | srp->header.msg_status = COMMAND_COMPLETE; |
d6b10348 MC |
1355 | srp->header.host_status = host_byte(result); |
1356 | srp->header.driver_status = driver_byte(result); | |
1da177e4 LT |
1357 | if ((sdp->sgdebug > 0) && |
1358 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1359 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
d811b848 | 1360 | __scsi_print_sense(sdp->device, __func__, sense, |
d6b10348 | 1361 | SCSI_SENSE_BUFFERSIZE); |
1da177e4 LT |
1362 | |
1363 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
d6b10348 MC |
1364 | if (driver_byte(result) != 0 |
1365 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) | |
1da177e4 LT |
1366 | && !scsi_sense_is_deferred(&sshdr) |
1367 | && sshdr.sense_key == UNIT_ATTENTION | |
1368 | && sdp->device->removable) { | |
1369 | /* Detected possible disc change. Set the bit - this */ | |
1370 | /* may be used if there are filesystems using this device */ | |
1371 | sdp->device->changed = 1; | |
1372 | } | |
1373 | } | |
82ed4db4 | 1374 | |
5b794f98 CH |
1375 | if (scmd->sense_len) |
1376 | memcpy(srp->sense_b, scmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); | |
82ed4db4 | 1377 | |
1da177e4 LT |
1378 | /* Rely on write phase to clean out srp status values, so no "else" */ |
1379 | ||
7568615c TB |
1380 | /* |
1381 | * Free the request as soon as it is complete so that its resources | |
1382 | * can be reused without waiting for userspace to read() the | |
1383 | * result. But keep the associated bio (if any) around until | |
1384 | * blk_rq_unmap_user() can be called from user context. | |
1385 | */ | |
1386 | srp->rq = NULL; | |
0bf6d96c | 1387 | blk_mq_free_request(rq); |
7568615c | 1388 | |
c6517b79 TB |
1389 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
1390 | if (unlikely(srp->orphan)) { | |
1da177e4 LT |
1391 | if (sfp->keep_orphan) |
1392 | srp->sg_io_owned = 0; | |
c6517b79 TB |
1393 | else |
1394 | done = 0; | |
1da177e4 | 1395 | } |
c6517b79 TB |
1396 | srp->done = done; |
1397 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1398 | ||
1399 | if (likely(done)) { | |
1400 | /* Now wake up any sg_read() that is waiting for this | |
1401 | * packet. | |
1402 | */ | |
1da177e4 | 1403 | wake_up_interruptible(&sfp->read_wait); |
c6517b79 | 1404 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); |
c96952ed | 1405 | kref_put(&sfp->f_ref, sg_remove_sfp); |
015640ed FT |
1406 | } else { |
1407 | INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); | |
1408 | schedule_work(&srp->ew.work); | |
1409 | } | |
de671d61 | 1410 | return RQ_END_IO_NONE; |
1da177e4 LT |
1411 | } |
1412 | ||
828c0950 | 1413 | static const struct file_operations sg_fops = { |
1da177e4 LT |
1414 | .owner = THIS_MODULE, |
1415 | .read = sg_read, | |
1416 | .write = sg_write, | |
1417 | .poll = sg_poll, | |
37b9d1e0 | 1418 | .unlocked_ioctl = sg_ioctl, |
2c2db2c6 | 1419 | .compat_ioctl = compat_ptr_ioctl, |
1da177e4 LT |
1420 | .open = sg_open, |
1421 | .mmap = sg_mmap, | |
1422 | .release = sg_release, | |
1423 | .fasync = sg_fasync, | |
6038f373 | 1424 | .llseek = no_llseek, |
1da177e4 LT |
1425 | }; |
1426 | ||
d253878b | 1427 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1428 | |
1429 | static int sg_sysfs_valid = 0; | |
1430 | ||
cc833acb | 1431 | static Sg_device * |
aebbb583 | 1432 | sg_alloc(struct scsi_device *scsidp) |
1da177e4 | 1433 | { |
d6b10348 | 1434 | struct request_queue *q = scsidp->request_queue; |
1da177e4 LT |
1435 | Sg_device *sdp; |
1436 | unsigned long iflags; | |
7c07d613 JB |
1437 | int error; |
1438 | u32 k; | |
1da177e4 | 1439 | |
24669f75 | 1440 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
1da177e4 | 1441 | if (!sdp) { |
cc833acb DG |
1442 | sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " |
1443 | "failure\n", __func__); | |
7c07d613 JB |
1444 | return ERR_PTR(-ENOMEM); |
1445 | } | |
c6517b79 | 1446 | |
b98c52b5 | 1447 | idr_preload(GFP_KERNEL); |
7c07d613 | 1448 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 | 1449 | |
b98c52b5 TH |
1450 | error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); |
1451 | if (error < 0) { | |
1452 | if (error == -ENOSPC) { | |
1453 | sdev_printk(KERN_WARNING, scsidp, | |
1454 | "Unable to attach sg device type=%d, minor number exceeds %d\n", | |
1455 | scsidp->type, SG_MAX_DEVS - 1); | |
1456 | error = -ENODEV; | |
1457 | } else { | |
cc833acb DG |
1458 | sdev_printk(KERN_WARNING, scsidp, "%s: idr " |
1459 | "allocation Sg_device failure: %d\n", | |
1460 | __func__, error); | |
b98c52b5 TH |
1461 | } |
1462 | goto out_unlock; | |
1da177e4 | 1463 | } |
b98c52b5 | 1464 | k = error; |
1da177e4 | 1465 | |
95e159d6 HR |
1466 | SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, |
1467 | "sg_alloc: dev=%d \n", k)); | |
aebbb583 | 1468 | sprintf(sdp->name, "sg%d", k); |
1da177e4 | 1469 | sdp->device = scsidp; |
cc833acb | 1470 | mutex_init(&sdp->open_rel_lock); |
3442f802 | 1471 | INIT_LIST_HEAD(&sdp->sfds); |
cc833acb DG |
1472 | init_waitqueue_head(&sdp->open_wait); |
1473 | atomic_set(&sdp->detaching, 0); | |
1474 | rwlock_init(&sdp->sfd_lock); | |
8a78362c | 1475 | sdp->sg_tablesize = queue_max_segments(q); |
7c07d613 | 1476 | sdp->index = k; |
c6517b79 | 1477 | kref_init(&sdp->d_ref); |
b98c52b5 | 1478 | error = 0; |
c6517b79 | 1479 | |
b98c52b5 | 1480 | out_unlock: |
c6517b79 | 1481 | write_unlock_irqrestore(&sg_index_lock, iflags); |
b98c52b5 | 1482 | idr_preload_end(); |
1da177e4 | 1483 | |
7c07d613 | 1484 | if (error) { |
1da177e4 | 1485 | kfree(sdp); |
7c07d613 JB |
1486 | return ERR_PTR(error); |
1487 | } | |
1488 | return sdp; | |
1da177e4 LT |
1489 | } |
1490 | ||
1491 | static int | |
2243acd5 | 1492 | sg_add_device(struct device *cl_dev) |
1da177e4 | 1493 | { |
ee959b00 | 1494 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1da177e4 LT |
1495 | Sg_device *sdp = NULL; |
1496 | struct cdev * cdev = NULL; | |
7c07d613 | 1497 | int error; |
454e8957 | 1498 | unsigned long iflags; |
1da177e4 | 1499 | |
80b60510 YK |
1500 | if (!blk_get_queue(scsidp->request_queue)) { |
1501 | pr_warn("%s: get scsi_device queue failed\n", __func__); | |
1502 | return -ENODEV; | |
1503 | } | |
db59133e | 1504 | |
1da177e4 LT |
1505 | error = -ENOMEM; |
1506 | cdev = cdev_alloc(); | |
1507 | if (!cdev) { | |
cc833acb | 1508 | pr_warn("%s: cdev_alloc failed\n", __func__); |
1da177e4 LT |
1509 | goto out; |
1510 | } | |
1511 | cdev->owner = THIS_MODULE; | |
1512 | cdev->ops = &sg_fops; | |
1513 | ||
aebbb583 | 1514 | sdp = sg_alloc(scsidp); |
7c07d613 | 1515 | if (IS_ERR(sdp)) { |
cc833acb | 1516 | pr_warn("%s: sg_alloc failed\n", __func__); |
7c07d613 | 1517 | error = PTR_ERR(sdp); |
1da177e4 LT |
1518 | goto out; |
1519 | } | |
1da177e4 | 1520 | |
7c07d613 | 1521 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
5e3c34c1 | 1522 | if (error) |
454e8957 | 1523 | goto cdev_add_err; |
5e3c34c1 | 1524 | |
1da177e4 LT |
1525 | sdp->cdev = cdev; |
1526 | if (sg_sysfs_valid) { | |
ee959b00 | 1527 | struct device *sg_class_member; |
1da177e4 | 1528 | |
d73a1a67 GKH |
1529 | sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, |
1530 | MKDEV(SCSI_GENERIC_MAJOR, | |
1531 | sdp->index), | |
aebbb583 | 1532 | sdp, "%s", sdp->name); |
d07e0361 | 1533 | if (IS_ERR(sg_class_member)) { |
cc833acb | 1534 | pr_err("%s: device_create failed\n", __func__); |
d07e0361 FT |
1535 | error = PTR_ERR(sg_class_member); |
1536 | goto cdev_add_err; | |
1537 | } | |
d07e0361 | 1538 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
1da177e4 LT |
1539 | &sg_class_member->kobj, "generic"); |
1540 | if (error) | |
cc833acb DG |
1541 | pr_err("%s: unable to make symlink 'generic' back " |
1542 | "to sg%d\n", __func__, sdp->index); | |
1da177e4 | 1543 | } else |
cc833acb | 1544 | pr_warn("%s: sg_sys Invalid\n", __func__); |
1da177e4 | 1545 | |
cc833acb DG |
1546 | sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d " |
1547 | "type %d\n", sdp->index, scsidp->type); | |
1da177e4 | 1548 | |
ee959b00 | 1549 | dev_set_drvdata(cl_dev, sdp); |
a24484f2 | 1550 | |
1da177e4 LT |
1551 | return 0; |
1552 | ||
454e8957 | 1553 | cdev_add_err: |
7c07d613 JB |
1554 | write_lock_irqsave(&sg_index_lock, iflags); |
1555 | idr_remove(&sg_index_idr, sdp->index); | |
1556 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1557 | kfree(sdp); | |
454e8957 | 1558 | |
1da177e4 | 1559 | out: |
1da177e4 LT |
1560 | if (cdev) |
1561 | cdev_del(cdev); | |
fcaa174a | 1562 | blk_put_queue(scsidp->request_queue); |
1da177e4 LT |
1563 | return error; |
1564 | } | |
1565 | ||
cc833acb DG |
1566 | static void |
1567 | sg_device_destroy(struct kref *kref) | |
c6517b79 TB |
1568 | { |
1569 | struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); | |
db59133e | 1570 | struct request_queue *q = sdp->device->request_queue; |
c6517b79 TB |
1571 | unsigned long flags; |
1572 | ||
1573 | /* CAUTION! Note that the device can still be found via idr_find() | |
1574 | * even though the refcount is 0. Therefore, do idr_remove() BEFORE | |
1575 | * any other cleanup. | |
1576 | */ | |
1577 | ||
db59133e | 1578 | blk_trace_remove(q); |
fcaa174a | 1579 | blk_put_queue(q); |
db59133e | 1580 | |
c6517b79 TB |
1581 | write_lock_irqsave(&sg_index_lock, flags); |
1582 | idr_remove(&sg_index_idr, sdp->index); | |
1583 | write_unlock_irqrestore(&sg_index_lock, flags); | |
1584 | ||
1585 | SCSI_LOG_TIMEOUT(3, | |
95e159d6 | 1586 | sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); |
c6517b79 | 1587 | |
c6517b79 TB |
1588 | kfree(sdp); |
1589 | } | |
1590 | ||
cc833acb | 1591 | static void |
2243acd5 | 1592 | sg_remove_device(struct device *cl_dev) |
1da177e4 | 1593 | { |
ee959b00 TJ |
1594 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1595 | Sg_device *sdp = dev_get_drvdata(cl_dev); | |
1da177e4 LT |
1596 | unsigned long iflags; |
1597 | Sg_fd *sfp; | |
cc833acb | 1598 | int val; |
1da177e4 | 1599 | |
cc833acb | 1600 | if (!sdp) |
1da177e4 | 1601 | return; |
cc833acb DG |
1602 | /* want sdp->detaching non-zero as soon as possible */ |
1603 | val = atomic_inc_return(&sdp->detaching); | |
1604 | if (val > 1) | |
1605 | return; /* only want to do following once per device */ | |
7c07d613 | 1606 | |
95e159d6 HR |
1607 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
1608 | "%s\n", __func__)); | |
c6517b79 | 1609 | |
cc833acb | 1610 | read_lock_irqsave(&sdp->sfd_lock, iflags); |
3442f802 | 1611 | list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { |
cc833acb | 1612 | wake_up_interruptible_all(&sfp->read_wait); |
c6517b79 | 1613 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); |
7c07d613 | 1614 | } |
cc833acb DG |
1615 | wake_up_interruptible_all(&sdp->open_wait); |
1616 | read_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
7c07d613 JB |
1617 | |
1618 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
ee959b00 | 1619 | device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
7c07d613 JB |
1620 | cdev_del(sdp->cdev); |
1621 | sdp->cdev = NULL; | |
1da177e4 | 1622 | |
cc833acb | 1623 | kref_put(&sdp->d_ref, sg_device_destroy); |
1da177e4 LT |
1624 | } |
1625 | ||
6460e75a DG |
1626 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
1627 | module_param_named(def_reserved_size, def_reserved_size, int, | |
1628 | S_IRUGO | S_IWUSR); | |
1da177e4 LT |
1629 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
1630 | ||
1631 | MODULE_AUTHOR("Douglas Gilbert"); | |
1632 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1633 | MODULE_LICENSE("GPL"); | |
1634 | MODULE_VERSION(SG_VERSION_STR); | |
f018fa55 | 1635 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
1da177e4 | 1636 | |
6460e75a DG |
1637 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
1638 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); | |
1da177e4 LT |
1639 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
1640 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1641 | ||
26d1c80f XN |
1642 | #ifdef CONFIG_SYSCTL |
1643 | #include <linux/sysctl.h> | |
1644 | ||
1645 | static struct ctl_table sg_sysctls[] = { | |
1646 | { | |
1647 | .procname = "sg-big-buff", | |
1648 | .data = &sg_big_buff, | |
1649 | .maxlen = sizeof(int), | |
1650 | .mode = 0444, | |
1651 | .proc_handler = proc_dointvec, | |
1652 | }, | |
1653 | {} | |
1654 | }; | |
1655 | ||
1656 | static struct ctl_table_header *hdr; | |
1657 | static void register_sg_sysctls(void) | |
1658 | { | |
1659 | if (!hdr) | |
1660 | hdr = register_sysctl("kernel", sg_sysctls); | |
1661 | } | |
1662 | ||
1663 | static void unregister_sg_sysctls(void) | |
1664 | { | |
1665 | if (hdr) | |
1666 | unregister_sysctl_table(hdr); | |
1667 | } | |
1668 | #else | |
1669 | #define register_sg_sysctls() do { } while (0) | |
1670 | #define unregister_sg_sysctls() do { } while (0) | |
1671 | #endif /* CONFIG_SYSCTL */ | |
1672 | ||
1da177e4 LT |
1673 | static int __init |
1674 | init_sg(void) | |
1675 | { | |
1676 | int rc; | |
1677 | ||
6460e75a DG |
1678 | if (scatter_elem_sz < PAGE_SIZE) { |
1679 | scatter_elem_sz = PAGE_SIZE; | |
1680 | scatter_elem_sz_prev = scatter_elem_sz; | |
1681 | } | |
1da177e4 LT |
1682 | if (def_reserved_size >= 0) |
1683 | sg_big_buff = def_reserved_size; | |
6460e75a DG |
1684 | else |
1685 | def_reserved_size = sg_big_buff; | |
1da177e4 LT |
1686 | |
1687 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1688 | SG_MAX_DEVS, "sg"); | |
1689 | if (rc) | |
1690 | return rc; | |
1aaba11d | 1691 | sg_sysfs_class = class_create("scsi_generic"); |
1da177e4 LT |
1692 | if ( IS_ERR(sg_sysfs_class) ) { |
1693 | rc = PTR_ERR(sg_sysfs_class); | |
1694 | goto err_out; | |
1695 | } | |
1696 | sg_sysfs_valid = 1; | |
1697 | rc = scsi_register_interface(&sg_interface); | |
1698 | if (0 == rc) { | |
1699 | #ifdef CONFIG_SCSI_PROC_FS | |
1700 | sg_proc_init(); | |
1701 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1702 | return 0; | |
1703 | } | |
d253878b | 1704 | class_destroy(sg_sysfs_class); |
26d1c80f | 1705 | register_sg_sysctls(); |
1da177e4 LT |
1706 | err_out: |
1707 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1708 | return rc; | |
1709 | } | |
1710 | ||
1711 | static void __exit | |
1712 | exit_sg(void) | |
1713 | { | |
26d1c80f | 1714 | unregister_sg_sysctls(); |
1da177e4 | 1715 | #ifdef CONFIG_SCSI_PROC_FS |
b8b1483d | 1716 | remove_proc_subtree("scsi/sg", NULL); |
1da177e4 LT |
1717 | #endif /* CONFIG_SCSI_PROC_FS */ |
1718 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1719 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1720 | sg_sysfs_valid = 0; |
1721 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1722 | SG_MAX_DEVS); | |
7c07d613 | 1723 | idr_destroy(&sg_index_idr); |
1da177e4 LT |
1724 | } |
1725 | ||
cc833acb DG |
1726 | static int |
1727 | sg_start_req(Sg_request *srp, unsigned char *cmd) | |
10865dfa | 1728 | { |
626710c9 | 1729 | int res; |
10865dfa | 1730 | struct request *rq; |
44c7b0ea FT |
1731 | Sg_fd *sfp = srp->parentfp; |
1732 | sg_io_hdr_t *hp = &srp->header; | |
1733 | int dxfer_len = (int) hp->dxfer_len; | |
1734 | int dxfer_dir = hp->dxfer_direction; | |
626710c9 | 1735 | unsigned int iov_count = hp->iovec_count; |
44c7b0ea FT |
1736 | Sg_scatter_hold *req_schp = &srp->data; |
1737 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1738 | struct request_queue *q = sfp->parentdp->device->request_queue; | |
626710c9 | 1739 | struct rq_map_data *md, map_data; |
de4eda9d | 1740 | int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? ITER_SOURCE : ITER_DEST; |
ce70fd9a | 1741 | struct scsi_cmnd *scmd; |
10865dfa | 1742 | |
95e159d6 HR |
1743 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1744 | "sg_start_req: dxfer_len=%d\n", | |
1745 | dxfer_len)); | |
44c7b0ea | 1746 | |
7772855a TB |
1747 | /* |
1748 | * NOTE | |
1749 | * | |
1750 | * With scsi-mq enabled, there are a fixed number of preallocated | |
1751 | * requests equal in number to shost->can_queue. If all of the | |
68ec3b81 | 1752 | * preallocated requests are already in use, then scsi_alloc_request() |
8e4a4189 TB |
1753 | * will sleep until an active command completes, freeing up a request. |
1754 | * Although waiting in an asynchronous interface is less than ideal, we | |
1755 | * do not want to use BLK_MQ_REQ_NOWAIT here because userspace might | |
1756 | * not expect an EWOULDBLOCK from this condition. | |
7772855a | 1757 | */ |
68ec3b81 | 1758 | rq = scsi_alloc_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ? |
da6269da | 1759 | REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); |
ce70fd9a | 1760 | if (IS_ERR(rq)) |
a492f075 | 1761 | return PTR_ERR(rq); |
ce70fd9a | 1762 | scmd = blk_mq_rq_to_pdu(rq); |
10865dfa | 1763 | |
ce70fd9a CH |
1764 | if (hp->cmd_len > sizeof(scmd->cmnd)) { |
1765 | blk_mq_free_request(rq); | |
1766 | return -EINVAL; | |
65c26a0f | 1767 | } |
10865dfa | 1768 | |
ce70fd9a CH |
1769 | memcpy(scmd->cmnd, cmd, hp->cmd_len); |
1770 | scmd->cmd_len = hp->cmd_len; | |
10865dfa FT |
1771 | |
1772 | srp->rq = rq; | |
1773 | rq->end_io_data = srp; | |
6aded12b | 1774 | scmd->allowed = SG_DEFAULT_RETRIES; |
10865dfa | 1775 | |
1da177e4 | 1776 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) |
10db10d1 | 1777 | return 0; |
10865dfa | 1778 | |
626710c9 FT |
1779 | if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && |
1780 | dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && | |
2610a254 | 1781 | blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) |
626710c9 FT |
1782 | md = NULL; |
1783 | else | |
1784 | md = &map_data; | |
1785 | ||
1786 | if (md) { | |
1bc0eb04 HR |
1787 | mutex_lock(&sfp->f_mutex); |
1788 | if (dxfer_len <= rsv_schp->bufflen && | |
1789 | !sfp->res_in_use) { | |
1790 | sfp->res_in_use = 1; | |
626710c9 | 1791 | sg_link_reserve(sfp, srp, dxfer_len); |
8d26f491 TP |
1792 | } else if (hp->flags & SG_FLAG_MMAP_IO) { |
1793 | res = -EBUSY; /* sfp->res_in_use == 1 */ | |
1794 | if (dxfer_len > rsv_schp->bufflen) | |
1795 | res = -ENOMEM; | |
1bc0eb04 | 1796 | mutex_unlock(&sfp->f_mutex); |
8d26f491 | 1797 | return res; |
1bc0eb04 | 1798 | } else { |
626710c9 | 1799 | res = sg_build_indirect(req_schp, sfp, dxfer_len); |
1bc0eb04 HR |
1800 | if (res) { |
1801 | mutex_unlock(&sfp->f_mutex); | |
626710c9 | 1802 | return res; |
1bc0eb04 | 1803 | } |
626710c9 | 1804 | } |
1bc0eb04 | 1805 | mutex_unlock(&sfp->f_mutex); |
7e56cb0f | 1806 | |
626710c9 FT |
1807 | md->pages = req_schp->pages; |
1808 | md->page_order = req_schp->page_order; | |
1809 | md->nr_entries = req_schp->k_use_sg; | |
56c451f4 | 1810 | md->offset = 0; |
97ae77a1 | 1811 | md->null_mapped = hp->dxferp ? 0 : 1; |
ecb554a8 FT |
1812 | if (dxfer_dir == SG_DXFER_TO_FROM_DEV) |
1813 | md->from_user = 1; | |
1814 | else | |
1815 | md->from_user = 0; | |
626710c9 FT |
1816 | } |
1817 | ||
6732932c AG |
1818 | res = blk_rq_map_user_io(rq, md, hp->dxferp, hp->dxfer_len, |
1819 | GFP_ATOMIC, iov_count, iov_count, 1, rw); | |
10db10d1 | 1820 | if (!res) { |
626710c9 | 1821 | srp->bio = rq->bio; |
10db10d1 | 1822 | |
626710c9 FT |
1823 | if (!md) { |
1824 | req_schp->dio_in_use = 1; | |
1825 | hp->info |= SG_INFO_DIRECT_IO; | |
1826 | } | |
1827 | } | |
10db10d1 | 1828 | return res; |
1da177e4 LT |
1829 | } |
1830 | ||
cc833acb DG |
1831 | static int |
1832 | sg_finish_rem_req(Sg_request *srp) | |
1da177e4 | 1833 | { |
e7ee4cc0 FT |
1834 | int ret = 0; |
1835 | ||
1da177e4 LT |
1836 | Sg_fd *sfp = srp->parentfp; |
1837 | Sg_scatter_hold *req_schp = &srp->data; | |
1838 | ||
95e159d6 HR |
1839 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1840 | "sg_finish_rem_req: res_used=%d\n", | |
1841 | (int) srp->res_used)); | |
7568615c TB |
1842 | if (srp->bio) |
1843 | ret = blk_rq_unmap_user(srp->bio); | |
10db10d1 | 1844 | |
ce70fd9a | 1845 | if (srp->rq) |
0bf6d96c | 1846 | blk_mq_free_request(srp->rq); |
10865dfa | 1847 | |
e27168f8 CS |
1848 | if (srp->res_used) |
1849 | sg_unlink_reserve(sfp, srp); | |
1850 | else | |
95e159d6 | 1851 | sg_remove_scat(sfp, req_schp); |
e27168f8 | 1852 | |
e7ee4cc0 | 1853 | return ret; |
1da177e4 LT |
1854 | } |
1855 | ||
1856 | static int | |
1857 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1858 | { | |
10db10d1 | 1859 | int sg_bufflen = tablesize * sizeof(struct page *); |
2d20eaf9 | 1860 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 1861 | |
10db10d1 FT |
1862 | schp->pages = kzalloc(sg_bufflen, gfp_flags); |
1863 | if (!schp->pages) | |
1da177e4 | 1864 | return -ENOMEM; |
1da177e4 | 1865 | schp->sglist_len = sg_bufflen; |
d6b10348 | 1866 | return tablesize; /* number of scat_gath elements allocated */ |
1da177e4 LT |
1867 | } |
1868 | ||
1da177e4 LT |
1869 | static int |
1870 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1871 | { | |
10db10d1 | 1872 | int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; |
d6b10348 | 1873 | int sg_tablesize = sfp->parentdp->sg_tablesize; |
10db10d1 | 1874 | int blk_size = buff_size, order; |
5b9d3974 | 1875 | gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN | __GFP_ZERO; |
1da177e4 | 1876 | |
fb119935 | 1877 | if (blk_size < 0) |
1da177e4 LT |
1878 | return -EFAULT; |
1879 | if (0 == blk_size) | |
1880 | ++blk_size; /* don't know why */ | |
b2ed6c69 FT |
1881 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ |
1882 | blk_size = ALIGN(blk_size, SG_SECTOR_SZ); | |
95e159d6 HR |
1883 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1884 | "sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1885 | buff_size, blk_size)); | |
d6b10348 MC |
1886 | |
1887 | /* N.B. ret_sz carried into this block ... */ | |
1888 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1889 | if (mx_sc_elems < 0) | |
1890 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1891 | ||
6460e75a DG |
1892 | num = scatter_elem_sz; |
1893 | if (unlikely(num != scatter_elem_sz_prev)) { | |
1894 | if (num < PAGE_SIZE) { | |
1895 | scatter_elem_sz = PAGE_SIZE; | |
1896 | scatter_elem_sz_prev = PAGE_SIZE; | |
1897 | } else | |
1898 | scatter_elem_sz_prev = num; | |
1899 | } | |
10db10d1 | 1900 | |
10db10d1 FT |
1901 | order = get_order(num); |
1902 | retry: | |
1903 | ret_sz = 1 << (PAGE_SHIFT + order); | |
1904 | ||
1905 | for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; | |
1906 | k++, rem_sz -= ret_sz) { | |
1907 | ||
6460e75a | 1908 | num = (rem_sz > scatter_elem_sz_prev) ? |
10db10d1 FT |
1909 | scatter_elem_sz_prev : rem_sz; |
1910 | ||
5b9d3974 | 1911 | schp->pages[k] = alloc_pages(gfp_mask, order); |
10db10d1 FT |
1912 | if (!schp->pages[k]) |
1913 | goto out; | |
d6b10348 | 1914 | |
6460e75a DG |
1915 | if (num == scatter_elem_sz_prev) { |
1916 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { | |
1917 | scatter_elem_sz = ret_sz; | |
1918 | scatter_elem_sz_prev = ret_sz; | |
1919 | } | |
1920 | } | |
d6b10348 | 1921 | |
95e159d6 HR |
1922 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
1923 | "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", | |
1924 | k, num, ret_sz)); | |
d6b10348 MC |
1925 | } /* end of for loop */ |
1926 | ||
10db10d1 | 1927 | schp->page_order = order; |
d6b10348 | 1928 | schp->k_use_sg = k; |
95e159d6 HR |
1929 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
1930 | "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", | |
1931 | k, rem_sz)); | |
d6b10348 MC |
1932 | |
1933 | schp->bufflen = blk_size; | |
1934 | if (rem_sz > 0) /* must have failed */ | |
1935 | return -ENOMEM; | |
1da177e4 | 1936 | return 0; |
10db10d1 FT |
1937 | out: |
1938 | for (i = 0; i < k; i++) | |
e71044ee | 1939 | __free_pages(schp->pages[i], order); |
10db10d1 FT |
1940 | |
1941 | if (--order >= 0) | |
1942 | goto retry; | |
1943 | ||
1944 | return -ENOMEM; | |
1da177e4 LT |
1945 | } |
1946 | ||
1da177e4 | 1947 | static void |
95e159d6 | 1948 | sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) |
1da177e4 | 1949 | { |
95e159d6 HR |
1950 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
1951 | "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
10db10d1 | 1952 | if (schp->pages && schp->sglist_len > 0) { |
6e5a30cb | 1953 | if (!schp->dio_in_use) { |
1da177e4 LT |
1954 | int k; |
1955 | ||
10db10d1 | 1956 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
95e159d6 HR |
1957 | SCSI_LOG_TIMEOUT(5, |
1958 | sg_printk(KERN_INFO, sfp->parentdp, | |
1959 | "sg_remove_scat: k=%d, pg=0x%p\n", | |
1960 | k, schp->pages[k])); | |
10db10d1 | 1961 | __free_pages(schp->pages[k], schp->page_order); |
1da177e4 | 1962 | } |
6e5a30cb | 1963 | |
10db10d1 | 1964 | kfree(schp->pages); |
1da177e4 | 1965 | } |
d6b10348 | 1966 | } |
1da177e4 LT |
1967 | memset(schp, 0, sizeof (*schp)); |
1968 | } | |
1969 | ||
1da177e4 LT |
1970 | static int |
1971 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
1972 | { | |
1973 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 1974 | int k, num; |
1da177e4 | 1975 | |
95e159d6 HR |
1976 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
1977 | "sg_read_oxfer: num_read_xfer=%d\n", | |
1978 | num_read_xfer)); | |
1da177e4 LT |
1979 | if ((!outp) || (num_read_xfer <= 0)) |
1980 | return 0; | |
d6b10348 | 1981 | |
10db10d1 FT |
1982 | num = 1 << (PAGE_SHIFT + schp->page_order); |
1983 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { | |
d6b10348 | 1984 | if (num > num_read_xfer) { |
c8c12792 | 1985 | if (copy_to_user(outp, page_address(schp->pages[k]), |
d6b10348 MC |
1986 | num_read_xfer)) |
1987 | return -EFAULT; | |
1988 | break; | |
1989 | } else { | |
c8c12792 | 1990 | if (copy_to_user(outp, page_address(schp->pages[k]), |
d6b10348 MC |
1991 | num)) |
1992 | return -EFAULT; | |
1993 | num_read_xfer -= num; | |
1994 | if (num_read_xfer <= 0) | |
1da177e4 | 1995 | break; |
d6b10348 | 1996 | outp += num; |
1da177e4 | 1997 | } |
1da177e4 | 1998 | } |
d6b10348 | 1999 | |
1da177e4 LT |
2000 | return 0; |
2001 | } | |
2002 | ||
2003 | static void | |
2004 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
2005 | { | |
2006 | Sg_scatter_hold *schp = &sfp->reserve; | |
2007 | ||
95e159d6 HR |
2008 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
2009 | "sg_build_reserve: req_size=%d\n", req_size)); | |
1da177e4 LT |
2010 | do { |
2011 | if (req_size < PAGE_SIZE) | |
2012 | req_size = PAGE_SIZE; | |
2013 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
2014 | return; | |
2015 | else | |
95e159d6 | 2016 | sg_remove_scat(sfp, schp); |
1da177e4 LT |
2017 | req_size >>= 1; /* divide by 2 */ |
2018 | } while (req_size > (PAGE_SIZE / 2)); | |
2019 | } | |
2020 | ||
2021 | static void | |
2022 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
2023 | { | |
2024 | Sg_scatter_hold *req_schp = &srp->data; | |
2025 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
d6b10348 | 2026 | int k, num, rem; |
1da177e4 LT |
2027 | |
2028 | srp->res_used = 1; | |
95e159d6 HR |
2029 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
2030 | "sg_link_reserve: size=%d\n", size)); | |
eca7be5e | 2031 | rem = size; |
d6b10348 | 2032 | |
10db10d1 FT |
2033 | num = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
2034 | for (k = 0; k < rsv_schp->k_use_sg; k++) { | |
d6b10348 | 2035 | if (rem <= num) { |
d6b10348 MC |
2036 | req_schp->k_use_sg = k + 1; |
2037 | req_schp->sglist_len = rsv_schp->sglist_len; | |
10db10d1 | 2038 | req_schp->pages = rsv_schp->pages; |
d6b10348 MC |
2039 | |
2040 | req_schp->bufflen = size; | |
10db10d1 | 2041 | req_schp->page_order = rsv_schp->page_order; |
d6b10348 MC |
2042 | break; |
2043 | } else | |
2044 | rem -= num; | |
1da177e4 | 2045 | } |
d6b10348 MC |
2046 | |
2047 | if (k >= rsv_schp->k_use_sg) | |
95e159d6 HR |
2048 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
2049 | "sg_link_reserve: BAD size\n")); | |
1da177e4 LT |
2050 | } |
2051 | ||
2052 | static void | |
2053 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2054 | { | |
2055 | Sg_scatter_hold *req_schp = &srp->data; | |
1da177e4 | 2056 | |
95e159d6 HR |
2057 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
2058 | "sg_unlink_reserve: req->k_use_sg=%d\n", | |
2059 | (int) req_schp->k_use_sg)); | |
1da177e4 LT |
2060 | req_schp->k_use_sg = 0; |
2061 | req_schp->bufflen = 0; | |
10db10d1 FT |
2062 | req_schp->pages = NULL; |
2063 | req_schp->page_order = 0; | |
1da177e4 | 2064 | req_schp->sglist_len = 0; |
1da177e4 | 2065 | srp->res_used = 0; |
e791ce27 HR |
2066 | /* Called without mutex lock to avoid deadlock */ |
2067 | sfp->res_in_use = 0; | |
1da177e4 LT |
2068 | } |
2069 | ||
2070 | static Sg_request * | |
3455607f | 2071 | sg_get_rq_mark(Sg_fd * sfp, int pack_id, bool *busy) |
1da177e4 LT |
2072 | { |
2073 | Sg_request *resp; | |
2074 | unsigned long iflags; | |
2075 | ||
3455607f | 2076 | *busy = false; |
1da177e4 | 2077 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
109bade9 | 2078 | list_for_each_entry(resp, &sfp->rq_list, entry) { |
3455607f TB |
2079 | /* look for requests that are not SG_IO owned */ |
2080 | if ((!resp->sg_io_owned) && | |
1da177e4 | 2081 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { |
3455607f TB |
2082 | switch (resp->done) { |
2083 | case 0: /* request active */ | |
2084 | *busy = true; | |
2085 | break; | |
2086 | case 1: /* request done; response ready to return */ | |
2087 | resp->done = 2; /* guard against other readers */ | |
2088 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2089 | return resp; | |
2090 | case 2: /* response already being returned */ | |
2091 | break; | |
2092 | } | |
1da177e4 LT |
2093 | } |
2094 | } | |
2095 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
48ae8484 | 2096 | return NULL; |
1da177e4 LT |
2097 | } |
2098 | ||
1da177e4 LT |
2099 | /* always adds to end of list */ |
2100 | static Sg_request * | |
2101 | sg_add_request(Sg_fd * sfp) | |
2102 | { | |
2103 | int k; | |
2104 | unsigned long iflags; | |
1da177e4 LT |
2105 | Sg_request *rp = sfp->req_arr; |
2106 | ||
2107 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
109bade9 HR |
2108 | if (!list_empty(&sfp->rq_list)) { |
2109 | if (!sfp->cmd_q) | |
2110 | goto out_unlock; | |
2111 | ||
2112 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2113 | if (!rp->parentfp) | |
2114 | break; | |
1da177e4 | 2115 | } |
109bade9 HR |
2116 | if (k >= SG_MAX_QUEUE) |
2117 | goto out_unlock; | |
1da177e4 | 2118 | } |
109bade9 HR |
2119 | memset(rp, 0, sizeof (Sg_request)); |
2120 | rp->parentfp = sfp; | |
2121 | rp->header.duration = jiffies_to_msecs(jiffies); | |
2122 | list_add_tail(&rp->entry, &sfp->rq_list); | |
1da177e4 | 2123 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
109bade9 HR |
2124 | return rp; |
2125 | out_unlock: | |
2126 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2127 | return NULL; | |
1da177e4 LT |
2128 | } |
2129 | ||
2130 | /* Return of 1 for found; 0 for not found */ | |
2131 | static int | |
2132 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2133 | { | |
1da177e4 LT |
2134 | unsigned long iflags; |
2135 | int res = 0; | |
2136 | ||
109bade9 | 2137 | if (!sfp || !srp || list_empty(&sfp->rq_list)) |
1da177e4 LT |
2138 | return res; |
2139 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
109bade9 HR |
2140 | if (!list_empty(&srp->entry)) { |
2141 | list_del(&srp->entry); | |
2142 | srp->parentfp = NULL; | |
1da177e4 | 2143 | res = 1; |
1da177e4 LT |
2144 | } |
2145 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
3455607f TB |
2146 | |
2147 | /* | |
2148 | * If the device is detaching, wakeup any readers in case we just | |
2149 | * removed the last response, which would leave nothing for them to | |
2150 | * return other than -ENODEV. | |
2151 | */ | |
2152 | if (unlikely(atomic_read(&sfp->parentdp->detaching))) | |
2153 | wake_up_interruptible_all(&sfp->read_wait); | |
2154 | ||
1da177e4 LT |
2155 | return res; |
2156 | } | |
2157 | ||
1da177e4 | 2158 | static Sg_fd * |
95e159d6 | 2159 | sg_add_sfp(Sg_device * sdp) |
1da177e4 LT |
2160 | { |
2161 | Sg_fd *sfp; | |
2162 | unsigned long iflags; | |
44ec9542 | 2163 | int bufflen; |
1da177e4 | 2164 | |
d6b10348 | 2165 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
1da177e4 | 2166 | if (!sfp) |
cc833acb | 2167 | return ERR_PTR(-ENOMEM); |
d6b10348 | 2168 | |
1da177e4 LT |
2169 | init_waitqueue_head(&sfp->read_wait); |
2170 | rwlock_init(&sfp->rq_list_lock); | |
109bade9 | 2171 | INIT_LIST_HEAD(&sfp->rq_list); |
c6517b79 | 2172 | kref_init(&sfp->f_ref); |
1bc0eb04 | 2173 | mutex_init(&sfp->f_mutex); |
1da177e4 LT |
2174 | sfp->timeout = SG_DEFAULT_TIMEOUT; |
2175 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2176 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
1da177e4 LT |
2177 | sfp->cmd_q = SG_DEF_COMMAND_Q; |
2178 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2179 | sfp->parentdp = sdp; | |
cc833acb DG |
2180 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
2181 | if (atomic_read(&sdp->detaching)) { | |
2182 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); | |
c170e5a8 | 2183 | kfree(sfp); |
cc833acb DG |
2184 | return ERR_PTR(-ENODEV); |
2185 | } | |
3442f802 | 2186 | list_add_tail(&sfp->sfd_siblings, &sdp->sfds); |
cc833acb | 2187 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
95e159d6 HR |
2188 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
2189 | "sg_add_sfp: sfp=0x%p\n", sfp)); | |
6460e75a DG |
2190 | if (unlikely(sg_big_buff != def_reserved_size)) |
2191 | sg_big_buff = def_reserved_size; | |
2192 | ||
44ec9542 | 2193 | bufflen = min_t(int, sg_big_buff, |
46f69e6a | 2194 | max_sectors_bytes(sdp->device->request_queue)); |
44ec9542 | 2195 | sg_build_reserve(sfp, bufflen); |
95e159d6 HR |
2196 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
2197 | "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", | |
2198 | sfp->reserve.bufflen, | |
2199 | sfp->reserve.k_use_sg)); | |
c6517b79 TB |
2200 | |
2201 | kref_get(&sdp->d_ref); | |
2202 | __module_get(THIS_MODULE); | |
1da177e4 LT |
2203 | return sfp; |
2204 | } | |
2205 | ||
cc833acb DG |
2206 | static void |
2207 | sg_remove_sfp_usercontext(struct work_struct *work) | |
1da177e4 | 2208 | { |
c6517b79 TB |
2209 | struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); |
2210 | struct sg_device *sdp = sfp->parentdp; | |
109bade9 | 2211 | Sg_request *srp; |
97d27b0d | 2212 | unsigned long iflags; |
c6517b79 TB |
2213 | |
2214 | /* Cleanup any responses which were never read(). */ | |
97d27b0d | 2215 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
109bade9 HR |
2216 | while (!list_empty(&sfp->rq_list)) { |
2217 | srp = list_first_entry(&sfp->rq_list, Sg_request, entry); | |
2218 | sg_finish_rem_req(srp); | |
97d27b0d HR |
2219 | list_del(&srp->entry); |
2220 | srp->parentfp = NULL; | |
109bade9 | 2221 | } |
97d27b0d | 2222 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
1da177e4 | 2223 | |
1da177e4 | 2224 | if (sfp->reserve.bufflen > 0) { |
95e159d6 HR |
2225 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
2226 | "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
c6517b79 TB |
2227 | (int) sfp->reserve.bufflen, |
2228 | (int) sfp->reserve.k_use_sg)); | |
95e159d6 | 2229 | sg_remove_scat(sfp, &sfp->reserve); |
1da177e4 | 2230 | } |
c6517b79 | 2231 | |
95e159d6 HR |
2232 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
2233 | "sg_remove_sfp: sfp=0x%p\n", sfp)); | |
d6b10348 | 2234 | kfree(sfp); |
c6517b79 TB |
2235 | |
2236 | scsi_device_put(sdp->device); | |
cc833acb | 2237 | kref_put(&sdp->d_ref, sg_device_destroy); |
c6517b79 | 2238 | module_put(THIS_MODULE); |
1da177e4 LT |
2239 | } |
2240 | ||
cc833acb DG |
2241 | static void |
2242 | sg_remove_sfp(struct kref *kref) | |
1da177e4 | 2243 | { |
c6517b79 | 2244 | struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); |
065b4a2f | 2245 | struct sg_device *sdp = sfp->parentdp; |
c6517b79 | 2246 | unsigned long iflags; |
1da177e4 | 2247 | |
cc833acb | 2248 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
3442f802 | 2249 | list_del(&sfp->sfd_siblings); |
cc833acb | 2250 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
1da177e4 | 2251 | |
015640ed FT |
2252 | INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); |
2253 | schedule_work(&sfp->ew.work); | |
1da177e4 LT |
2254 | } |
2255 | ||
1da177e4 | 2256 | #ifdef CONFIG_SCSI_PROC_FS |
7c07d613 JB |
2257 | static int |
2258 | sg_idr_max_id(int id, void *p, void *data) | |
2259 | { | |
2260 | int *k = data; | |
2261 | ||
2262 | if (*k < id) | |
2263 | *k = id; | |
2264 | ||
2265 | return 0; | |
2266 | } | |
2267 | ||
1da177e4 LT |
2268 | static int |
2269 | sg_last_dev(void) | |
2270 | { | |
53474c04 | 2271 | int k = -1; |
1da177e4 LT |
2272 | unsigned long iflags; |
2273 | ||
7c07d613 JB |
2274 | read_lock_irqsave(&sg_index_lock, iflags); |
2275 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); | |
2276 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 LT |
2277 | return k + 1; /* origin 1 */ |
2278 | } | |
2279 | #endif | |
2280 | ||
c6517b79 TB |
2281 | /* must be called with sg_index_lock held */ |
2282 | static Sg_device *sg_lookup_dev(int dev) | |
1da177e4 | 2283 | { |
c6517b79 TB |
2284 | return idr_find(&sg_index_idr, dev); |
2285 | } | |
1da177e4 | 2286 | |
cc833acb DG |
2287 | static Sg_device * |
2288 | sg_get_dev(int dev) | |
c6517b79 TB |
2289 | { |
2290 | struct sg_device *sdp; | |
2291 | unsigned long flags; | |
2292 | ||
2293 | read_lock_irqsave(&sg_index_lock, flags); | |
2294 | sdp = sg_lookup_dev(dev); | |
2295 | if (!sdp) | |
2296 | sdp = ERR_PTR(-ENXIO); | |
cc833acb DG |
2297 | else if (atomic_read(&sdp->detaching)) { |
2298 | /* If sdp->detaching, then the refcount may already be 0, in | |
c6517b79 TB |
2299 | * which case it would be a bug to do kref_get(). |
2300 | */ | |
2301 | sdp = ERR_PTR(-ENODEV); | |
2302 | } else | |
2303 | kref_get(&sdp->d_ref); | |
2304 | read_unlock_irqrestore(&sg_index_lock, flags); | |
7c07d613 | 2305 | |
1da177e4 LT |
2306 | return sdp; |
2307 | } | |
2308 | ||
2309 | #ifdef CONFIG_SCSI_PROC_FS | |
1da177e4 LT |
2310 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); |
2311 | ||
2312 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2313 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2314 | size_t count, loff_t *off); | |
97a32539 AD |
2315 | static const struct proc_ops adio_proc_ops = { |
2316 | .proc_open = sg_proc_single_open_adio, | |
2317 | .proc_read = seq_read, | |
2318 | .proc_lseek = seq_lseek, | |
2319 | .proc_write = sg_proc_write_adio, | |
2320 | .proc_release = single_release, | |
1da177e4 LT |
2321 | }; |
2322 | ||
2323 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2324 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2325 | const char __user *buffer, size_t count, loff_t *off); | |
97a32539 AD |
2326 | static const struct proc_ops dressz_proc_ops = { |
2327 | .proc_open = sg_proc_single_open_dressz, | |
2328 | .proc_read = seq_read, | |
2329 | .proc_lseek = seq_lseek, | |
2330 | .proc_write = sg_proc_write_dressz, | |
2331 | .proc_release = single_release, | |
1da177e4 LT |
2332 | }; |
2333 | ||
2334 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
1da177e4 | 2335 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); |
1da177e4 | 2336 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); |
1da177e4 LT |
2337 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); |
2338 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2339 | static void dev_seq_stop(struct seq_file *s, void *v); | |
88e9d34c | 2340 | static const struct seq_operations dev_seq_ops = { |
1da177e4 LT |
2341 | .start = dev_seq_start, |
2342 | .next = dev_seq_next, | |
2343 | .stop = dev_seq_stop, | |
2344 | .show = sg_proc_seq_show_dev, | |
2345 | }; | |
2346 | ||
2347 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
88e9d34c | 2348 | static const struct seq_operations devstrs_seq_ops = { |
1da177e4 LT |
2349 | .start = dev_seq_start, |
2350 | .next = dev_seq_next, | |
2351 | .stop = dev_seq_stop, | |
2352 | .show = sg_proc_seq_show_devstrs, | |
2353 | }; | |
2354 | ||
2355 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
88e9d34c | 2356 | static const struct seq_operations debug_seq_ops = { |
1da177e4 LT |
2357 | .start = dev_seq_start, |
2358 | .next = dev_seq_next, | |
2359 | .stop = dev_seq_stop, | |
2360 | .show = sg_proc_seq_show_debug, | |
2361 | }; | |
2362 | ||
1da177e4 LT |
2363 | static int |
2364 | sg_proc_init(void) | |
2365 | { | |
b8b1483d | 2366 | struct proc_dir_entry *p; |
1da177e4 | 2367 | |
b8b1483d CH |
2368 | p = proc_mkdir("scsi/sg", NULL); |
2369 | if (!p) | |
1da177e4 | 2370 | return 1; |
1da177e4 | 2371 | |
97a32539 | 2372 | proc_create("allow_dio", S_IRUGO | S_IWUSR, p, &adio_proc_ops); |
b8b1483d | 2373 | proc_create_seq("debug", S_IRUGO, p, &debug_seq_ops); |
97a32539 | 2374 | proc_create("def_reserved_size", S_IRUGO | S_IWUSR, p, &dressz_proc_ops); |
b8b1483d CH |
2375 | proc_create_single("device_hdr", S_IRUGO, p, sg_proc_seq_show_devhdr); |
2376 | proc_create_seq("devices", S_IRUGO, p, &dev_seq_ops); | |
2377 | proc_create_seq("device_strs", S_IRUGO, p, &devstrs_seq_ops); | |
2378 | proc_create_single("version", S_IRUGO, p, sg_proc_seq_show_version); | |
2379 | return 0; | |
1da177e4 LT |
2380 | } |
2381 | ||
2382 | ||
2383 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2384 | { | |
2385 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2386 | return 0; | |
2387 | } | |
2388 | ||
2389 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2390 | { | |
2391 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2392 | } | |
2393 | ||
2394 | static ssize_t | |
2395 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2396 | size_t count, loff_t *off) | |
2397 | { | |
7e95fffe SB |
2398 | int err; |
2399 | unsigned long num; | |
1da177e4 LT |
2400 | |
2401 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2402 | return -EACCES; | |
7e95fffe SB |
2403 | err = kstrtoul_from_user(buffer, count, 0, &num); |
2404 | if (err) | |
2405 | return err; | |
2406 | sg_allow_dio = num ? 1 : 0; | |
1da177e4 LT |
2407 | return count; |
2408 | } | |
2409 | ||
2410 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2411 | { | |
2412 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2413 | } | |
2414 | ||
2415 | static ssize_t | |
2416 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2417 | size_t count, loff_t *off) | |
2418 | { | |
7e95fffe | 2419 | int err; |
1da177e4 | 2420 | unsigned long k = ULONG_MAX; |
1da177e4 LT |
2421 | |
2422 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2423 | return -EACCES; | |
7e95fffe SB |
2424 | |
2425 | err = kstrtoul_from_user(buffer, count, 0, &k); | |
2426 | if (err) | |
2427 | return err; | |
1da177e4 LT |
2428 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ |
2429 | sg_big_buff = k; | |
2430 | return count; | |
2431 | } | |
2432 | return -ERANGE; | |
2433 | } | |
2434 | ||
2435 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2436 | { | |
2437 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2438 | sg_version_date); | |
2439 | return 0; | |
2440 | } | |
2441 | ||
1da177e4 LT |
2442 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) |
2443 | { | |
cc833acb | 2444 | seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); |
1da177e4 LT |
2445 | return 0; |
2446 | } | |
2447 | ||
1da177e4 LT |
2448 | struct sg_proc_deviter { |
2449 | loff_t index; | |
2450 | size_t max; | |
2451 | }; | |
2452 | ||
2453 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2454 | { | |
2455 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2456 | ||
729d70f5 | 2457 | s->private = it; |
1da177e4 LT |
2458 | if (! it) |
2459 | return NULL; | |
729d70f5 | 2460 | |
1da177e4 LT |
2461 | it->index = *pos; |
2462 | it->max = sg_last_dev(); | |
2463 | if (it->index >= it->max) | |
729d70f5 | 2464 | return NULL; |
1da177e4 | 2465 | return it; |
1da177e4 LT |
2466 | } |
2467 | ||
2468 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2469 | { | |
729d70f5 | 2470 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2471 | |
2472 | *pos = ++it->index; | |
2473 | return (it->index < it->max) ? it : NULL; | |
2474 | } | |
2475 | ||
2476 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2477 | { | |
729d70f5 | 2478 | kfree(s->private); |
1da177e4 LT |
2479 | } |
2480 | ||
1da177e4 LT |
2481 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) |
2482 | { | |
2483 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2484 | Sg_device *sdp; | |
2485 | struct scsi_device *scsidp; | |
c6517b79 | 2486 | unsigned long iflags; |
1da177e4 | 2487 | |
c6517b79 TB |
2488 | read_lock_irqsave(&sg_index_lock, iflags); |
2489 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
cc833acb DG |
2490 | if ((NULL == sdp) || (NULL == sdp->device) || |
2491 | (atomic_read(&sdp->detaching))) | |
2492 | seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
2493 | else { | |
2494 | scsidp = sdp->device; | |
9cb78c16 | 2495 | seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", |
1da177e4 LT |
2496 | scsidp->host->host_no, scsidp->channel, |
2497 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
2498 | 1, | |
2499 | (int) scsidp->queue_depth, | |
8278807a | 2500 | (int) scsi_device_busy(scsidp), |
1da177e4 | 2501 | (int) scsi_device_online(scsidp)); |
cc833acb | 2502 | } |
c6517b79 | 2503 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2504 | return 0; |
2505 | } | |
2506 | ||
1da177e4 LT |
2507 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) |
2508 | { | |
2509 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2510 | Sg_device *sdp; | |
2511 | struct scsi_device *scsidp; | |
c6517b79 | 2512 | unsigned long iflags; |
1da177e4 | 2513 | |
c6517b79 TB |
2514 | read_lock_irqsave(&sg_index_lock, iflags); |
2515 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
cc833acb DG |
2516 | scsidp = sdp ? sdp->device : NULL; |
2517 | if (sdp && scsidp && (!atomic_read(&sdp->detaching))) | |
1da177e4 LT |
2518 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", |
2519 | scsidp->vendor, scsidp->model, scsidp->rev); | |
2520 | else | |
cc833acb | 2521 | seq_puts(s, "<no active device>\n"); |
c6517b79 | 2522 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2523 | return 0; |
2524 | } | |
2525 | ||
c0d3b9c2 | 2526 | /* must be called while holding sg_index_lock */ |
1da177e4 LT |
2527 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) |
2528 | { | |
109bade9 | 2529 | int k, new_interface, blen, usg; |
1da177e4 LT |
2530 | Sg_request *srp; |
2531 | Sg_fd *fp; | |
2532 | const sg_io_hdr_t *hp; | |
2533 | const char * cp; | |
cb59e840 | 2534 | unsigned int ms; |
1da177e4 | 2535 | |
3442f802 FT |
2536 | k = 0; |
2537 | list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { | |
2538 | k++; | |
c6517b79 | 2539 | read_lock(&fp->rq_list_lock); /* irqs already disabled */ |
1da177e4 | 2540 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " |
3442f802 | 2541 | "(res)sgat=%d low_dma=%d\n", k, |
1da177e4 LT |
2542 | jiffies_to_msecs(fp->timeout), |
2543 | fp->reserve.bufflen, | |
aaff5eba | 2544 | (int) fp->reserve.k_use_sg, 0); |
ebaf466b | 2545 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", |
1da177e4 | 2546 | (int) fp->cmd_q, (int) fp->force_packid, |
ebaf466b | 2547 | (int) fp->keep_orphan); |
109bade9 | 2548 | list_for_each_entry(srp, &fp->rq_list, entry) { |
1da177e4 LT |
2549 | hp = &srp->header; |
2550 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
2551 | if (srp->res_used) { | |
109bade9 | 2552 | if (new_interface && |
1da177e4 LT |
2553 | (SG_FLAG_MMAP_IO & hp->flags)) |
2554 | cp = " mmap>> "; | |
2555 | else | |
2556 | cp = " rb>> "; | |
2557 | } else { | |
2558 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
2559 | cp = " dio>> "; | |
2560 | else | |
2561 | cp = " "; | |
2562 | } | |
cc833acb | 2563 | seq_puts(s, cp); |
d6b10348 MC |
2564 | blen = srp->data.bufflen; |
2565 | usg = srp->data.k_use_sg; | |
cc833acb DG |
2566 | seq_puts(s, srp->done ? |
2567 | ((1 == srp->done) ? "rcv:" : "fin:") | |
2568 | : "act:"); | |
1da177e4 LT |
2569 | seq_printf(s, " id=%d blen=%d", |
2570 | srp->header.pack_id, blen); | |
2571 | if (srp->done) | |
2572 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 | 2573 | else { |
2574 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 2575 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 | 2576 | (new_interface ? hp->timeout : |
2577 | jiffies_to_msecs(fp->timeout)), | |
2578 | (ms > hp->duration ? ms - hp->duration : 0)); | |
2579 | } | |
1da177e4 LT |
2580 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
2581 | (int) srp->data.cmd_opcode); | |
2582 | } | |
109bade9 | 2583 | if (list_empty(&fp->rq_list)) |
cc833acb | 2584 | seq_puts(s, " No requests active\n"); |
c6517b79 | 2585 | read_unlock(&fp->rq_list_lock); |
1da177e4 LT |
2586 | } |
2587 | } | |
2588 | ||
1da177e4 LT |
2589 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) |
2590 | { | |
2591 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2592 | Sg_device *sdp; | |
c6517b79 | 2593 | unsigned long iflags; |
1da177e4 | 2594 | |
cc833acb DG |
2595 | if (it && (0 == it->index)) |
2596 | seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", | |
2597 | (int)it->max, sg_big_buff); | |
1da177e4 | 2598 | |
c6517b79 TB |
2599 | read_lock_irqsave(&sg_index_lock, iflags); |
2600 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
cc833acb DG |
2601 | if (NULL == sdp) |
2602 | goto skip; | |
2603 | read_lock(&sdp->sfd_lock); | |
2604 | if (!list_empty(&sdp->sfds)) { | |
aebbb583 | 2605 | seq_printf(s, " >>> device=%s ", sdp->name); |
cc833acb DG |
2606 | if (atomic_read(&sdp->detaching)) |
2607 | seq_puts(s, "detaching pending close "); | |
2608 | else if (sdp->device) { | |
2609 | struct scsi_device *scsidp = sdp->device; | |
2610 | ||
9cb78c16 | 2611 | seq_printf(s, "%d:%d:%d:%llu em=%d", |
cc833acb DG |
2612 | scsidp->host->host_no, |
2613 | scsidp->channel, scsidp->id, | |
2614 | scsidp->lun, | |
2615 | scsidp->host->hostt->emulated); | |
2616 | } | |
2617 | seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", | |
2618 | sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); | |
c0d3b9c2 | 2619 | sg_proc_debug_helper(s, sdp); |
1da177e4 | 2620 | } |
cc833acb DG |
2621 | read_unlock(&sdp->sfd_lock); |
2622 | skip: | |
c6517b79 | 2623 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2624 | return 0; |
2625 | } | |
2626 | ||
2627 | #endif /* CONFIG_SCSI_PROC_FS */ | |
2628 | ||
2629 | module_init(init_sg); | |
2630 | module_exit(exit_sg); |