Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Network block device - make block devices work over TCP | |
3 | * | |
4 | * Note that you can not swap over this thing, yet. Seems to work but | |
5 | * deadlocks sometimes - you can not swap over TCP in general. | |
6 | * | |
a2531293 | 7 | * Copyright 1997-2000, 2008 Pavel Machek <pavel@ucw.cz> |
1da177e4 LT |
8 | * Parts copyright 2001 Steven Whitehouse <steve@chygwyn.com> |
9 | * | |
dbf492d6 | 10 | * This file is released under GPLv2 or later. |
1da177e4 | 11 | * |
dbf492d6 | 12 | * (part of code stolen from loop.c) |
1da177e4 LT |
13 | */ |
14 | ||
15 | #include <linux/major.h> | |
16 | ||
17 | #include <linux/blkdev.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/bio.h> | |
23 | #include <linux/stat.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/file.h> | |
26 | #include <linux/ioctl.h> | |
2a48fc0a | 27 | #include <linux/mutex.h> |
4b2f0260 HX |
28 | #include <linux/compiler.h> |
29 | #include <linux/err.h> | |
30 | #include <linux/kernel.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 | 32 | #include <net/sock.h> |
91cf45f0 | 33 | #include <linux/net.h> |
48cf6061 | 34 | #include <linux/kthread.h> |
b9c495bb | 35 | #include <linux/types.h> |
30d53d9c | 36 | #include <linux/debugfs.h> |
1da177e4 | 37 | |
1da177e4 LT |
38 | #include <asm/uaccess.h> |
39 | #include <asm/types.h> | |
40 | ||
41 | #include <linux/nbd.h> | |
42 | ||
13e71d69 | 43 | struct nbd_device { |
22d109c1 | 44 | u32 flags; |
13e71d69 MP |
45 | struct socket * sock; /* If == NULL, device is not ready, yet */ |
46 | int magic; | |
47 | ||
48 | spinlock_t queue_lock; | |
49 | struct list_head queue_head; /* Requests waiting result */ | |
50 | struct request *active_req; | |
51 | wait_queue_head_t active_wq; | |
52 | struct list_head waiting_queue; /* Requests to be sent */ | |
53 | wait_queue_head_t waiting_wq; | |
54 | ||
55 | struct mutex tx_lock; | |
56 | struct gendisk *disk; | |
57 | int blksize; | |
b9c495bb | 58 | loff_t bytesize; |
13e71d69 | 59 | int xmit_timeout; |
696697cb | 60 | bool disconnect; /* a disconnect has been requested by user */ |
7e2893a1 MP |
61 | |
62 | struct timer_list timeout_timer; | |
23272a67 MP |
63 | /* protects initialization and shutdown of the socket */ |
64 | spinlock_t sock_lock; | |
7e2893a1 MP |
65 | struct task_struct *task_recv; |
66 | struct task_struct *task_send; | |
30d53d9c MP |
67 | |
68 | #if IS_ENABLED(CONFIG_DEBUG_FS) | |
69 | struct dentry *dbg_dir; | |
70 | #endif | |
13e71d69 MP |
71 | }; |
72 | ||
30d53d9c MP |
73 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
74 | static struct dentry *nbd_dbg_dir; | |
75 | #endif | |
76 | ||
77 | #define nbd_name(nbd) ((nbd)->disk->disk_name) | |
78 | ||
f4507164 | 79 | #define NBD_MAGIC 0x68797548 |
1da177e4 | 80 | |
9c7a4169 | 81 | static unsigned int nbds_max = 16; |
20a8143e | 82 | static struct nbd_device *nbd_dev; |
d71a6d73 | 83 | static int max_part; |
1da177e4 LT |
84 | |
85 | /* | |
86 | * Use just one lock (or at most 1 per NIC). Two arguments for this: | |
87 | * 1. Each NIC is essentially a synchronization point for all servers | |
88 | * accessed through that NIC so there's no need to have more locks | |
89 | * than NICs anyway. | |
90 | * 2. More locks lead to more "Dirty cache line bouncing" which will slow | |
91 | * down each lock to the point where they're actually slower than just | |
92 | * a single lock. | |
93 | * Thanks go to Jens Axboe and Al Viro for their LKML emails explaining this! | |
94 | */ | |
95 | static DEFINE_SPINLOCK(nbd_lock); | |
96 | ||
d18509f5 | 97 | static inline struct device *nbd_to_dev(struct nbd_device *nbd) |
1da177e4 | 98 | { |
d18509f5 | 99 | return disk_to_dev(nbd->disk); |
1da177e4 LT |
100 | } |
101 | ||
102 | static const char *nbdcmd_to_ascii(int cmd) | |
103 | { | |
104 | switch (cmd) { | |
105 | case NBD_CMD_READ: return "read"; | |
106 | case NBD_CMD_WRITE: return "write"; | |
107 | case NBD_CMD_DISC: return "disconnect"; | |
75f187ab | 108 | case NBD_CMD_FLUSH: return "flush"; |
a336d298 | 109 | case NBD_CMD_TRIM: return "trim/discard"; |
1da177e4 LT |
110 | } |
111 | return "invalid"; | |
112 | } | |
1da177e4 | 113 | |
d18509f5 | 114 | static void nbd_end_request(struct nbd_device *nbd, struct request *req) |
1da177e4 | 115 | { |
097c94a4 | 116 | int error = req->errors ? -EIO : 0; |
165125e1 | 117 | struct request_queue *q = req->q; |
1da177e4 LT |
118 | unsigned long flags; |
119 | ||
d18509f5 MP |
120 | dev_dbg(nbd_to_dev(nbd), "request %p: %s\n", req, |
121 | error ? "failed" : "done"); | |
1da177e4 LT |
122 | |
123 | spin_lock_irqsave(q->queue_lock, flags); | |
1011c1b9 | 124 | __blk_end_request_all(req, error); |
1da177e4 LT |
125 | spin_unlock_irqrestore(q->queue_lock, flags); |
126 | } | |
127 | ||
e018e757 MP |
128 | /* |
129 | * Forcibly shutdown the socket causing all listeners to error | |
130 | */ | |
36e47bee | 131 | static void sock_shutdown(struct nbd_device *nbd) |
7fdfd406 | 132 | { |
23272a67 MP |
133 | spin_lock_irq(&nbd->sock_lock); |
134 | ||
135 | if (!nbd->sock) { | |
136 | spin_unlock_irq(&nbd->sock_lock); | |
260bbce4 | 137 | return; |
23272a67 | 138 | } |
260bbce4 MP |
139 | |
140 | dev_warn(disk_to_dev(nbd->disk), "shutting down socket\n"); | |
141 | kernel_sock_shutdown(nbd->sock, SHUT_RDWR); | |
23272a67 | 142 | sockfd_put(nbd->sock); |
260bbce4 | 143 | nbd->sock = NULL; |
23272a67 MP |
144 | spin_unlock_irq(&nbd->sock_lock); |
145 | ||
146 | del_timer(&nbd->timeout_timer); | |
7fdfd406 PC |
147 | } |
148 | ||
149 | static void nbd_xmit_timeout(unsigned long arg) | |
150 | { | |
7e2893a1 | 151 | struct nbd_device *nbd = (struct nbd_device *)arg; |
dcc909d9 | 152 | unsigned long flags; |
7e2893a1 MP |
153 | |
154 | if (list_empty(&nbd->queue_head)) | |
155 | return; | |
156 | ||
696697cb | 157 | nbd->disconnect = true; |
7e2893a1 | 158 | |
23272a67 | 159 | spin_lock_irqsave(&nbd->sock_lock, flags); |
dcc909d9 | 160 | |
7fdfd406 | 161 | |
23272a67 MP |
162 | if (nbd->sock) |
163 | kernel_sock_shutdown(nbd->sock, SHUT_RDWR); | |
7e2893a1 | 164 | |
23272a67 | 165 | spin_unlock_irqrestore(&nbd->sock_lock, flags); |
dcc909d9 | 166 | |
23272a67 | 167 | dev_err(nbd_to_dev(nbd), "Connection timed out, shutting down connection\n"); |
7fdfd406 PC |
168 | } |
169 | ||
1da177e4 LT |
170 | /* |
171 | * Send or receive packet. | |
172 | */ | |
f4507164 | 173 | static int sock_xmit(struct nbd_device *nbd, int send, void *buf, int size, |
1da177e4 LT |
174 | int msg_flags) |
175 | { | |
f4507164 | 176 | struct socket *sock = nbd->sock; |
1da177e4 LT |
177 | int result; |
178 | struct msghdr msg; | |
179 | struct kvec iov; | |
7f338fe4 | 180 | unsigned long pflags = current->flags; |
1da177e4 | 181 | |
ffc41cf8 | 182 | if (unlikely(!sock)) { |
f4507164 | 183 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
184 | "Attempted %s on closed socket in sock_xmit\n", |
185 | (send ? "send" : "recv")); | |
ffc41cf8 MS |
186 | return -EINVAL; |
187 | } | |
188 | ||
7f338fe4 | 189 | current->flags |= PF_MEMALLOC; |
1da177e4 | 190 | do { |
7f338fe4 | 191 | sock->sk->sk_allocation = GFP_NOIO | __GFP_MEMALLOC; |
1da177e4 LT |
192 | iov.iov_base = buf; |
193 | iov.iov_len = size; | |
194 | msg.msg_name = NULL; | |
195 | msg.msg_namelen = 0; | |
196 | msg.msg_control = NULL; | |
197 | msg.msg_controllen = 0; | |
1da177e4 LT |
198 | msg.msg_flags = msg_flags | MSG_NOSIGNAL; |
199 | ||
7e2893a1 | 200 | if (send) |
1da177e4 | 201 | result = kernel_sendmsg(sock, &msg, &iov, 1, size); |
7e2893a1 | 202 | else |
35fbf5bc NK |
203 | result = kernel_recvmsg(sock, &msg, &iov, 1, size, |
204 | msg.msg_flags); | |
1da177e4 | 205 | |
1da177e4 LT |
206 | if (result <= 0) { |
207 | if (result == 0) | |
208 | result = -EPIPE; /* short read */ | |
209 | break; | |
210 | } | |
211 | size -= result; | |
212 | buf += result; | |
213 | } while (size > 0); | |
214 | ||
7f338fe4 | 215 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
1da177e4 | 216 | |
7e2893a1 MP |
217 | if (!send && nbd->xmit_timeout) |
218 | mod_timer(&nbd->timeout_timer, jiffies + nbd->xmit_timeout); | |
219 | ||
1da177e4 LT |
220 | return result; |
221 | } | |
222 | ||
f4507164 | 223 | static inline int sock_send_bvec(struct nbd_device *nbd, struct bio_vec *bvec, |
1da177e4 LT |
224 | int flags) |
225 | { | |
226 | int result; | |
227 | void *kaddr = kmap(bvec->bv_page); | |
f4507164 WG |
228 | result = sock_xmit(nbd, 1, kaddr + bvec->bv_offset, |
229 | bvec->bv_len, flags); | |
1da177e4 LT |
230 | kunmap(bvec->bv_page); |
231 | return result; | |
232 | } | |
233 | ||
7fdfd406 | 234 | /* always call with the tx_lock held */ |
f4507164 | 235 | static int nbd_send_req(struct nbd_device *nbd, struct request *req) |
1da177e4 | 236 | { |
5705f702 | 237 | int result, flags; |
1da177e4 | 238 | struct nbd_request request; |
1011c1b9 | 239 | unsigned long size = blk_rq_bytes(req); |
9dc6c806 CH |
240 | u32 type; |
241 | ||
242 | if (req->cmd_type == REQ_TYPE_DRV_PRIV) | |
243 | type = NBD_CMD_DISC; | |
244 | else if (req->cmd_flags & REQ_DISCARD) | |
245 | type = NBD_CMD_TRIM; | |
246 | else if (req->cmd_flags & REQ_FLUSH) | |
247 | type = NBD_CMD_FLUSH; | |
248 | else if (rq_data_dir(req) == WRITE) | |
249 | type = NBD_CMD_WRITE; | |
250 | else | |
251 | type = NBD_CMD_READ; | |
1da177e4 | 252 | |
04cfac4e | 253 | memset(&request, 0, sizeof(request)); |
1da177e4 | 254 | request.magic = htonl(NBD_REQUEST_MAGIC); |
9dc6c806 CH |
255 | request.type = htonl(type); |
256 | if (type != NBD_CMD_FLUSH && type != NBD_CMD_DISC) { | |
75f187ab AB |
257 | request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9); |
258 | request.len = htonl(size); | |
259 | } | |
1da177e4 LT |
260 | memcpy(request.handle, &req, sizeof(req)); |
261 | ||
d18509f5 | 262 | dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n", |
9dc6c806 | 263 | req, nbdcmd_to_ascii(type), |
d18509f5 | 264 | (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req)); |
f4507164 | 265 | result = sock_xmit(nbd, 1, &request, sizeof(request), |
9dc6c806 | 266 | (type == NBD_CMD_WRITE) ? MSG_MORE : 0); |
1da177e4 | 267 | if (result <= 0) { |
f4507164 | 268 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 | 269 | "Send control failed (result %d)\n", result); |
dab5313a | 270 | return -EIO; |
1da177e4 LT |
271 | } |
272 | ||
9dc6c806 | 273 | if (type == NBD_CMD_WRITE) { |
5705f702 | 274 | struct req_iterator iter; |
7988613b | 275 | struct bio_vec bvec; |
1da177e4 LT |
276 | /* |
277 | * we are really probing at internals to determine | |
278 | * whether to set MSG_MORE or not... | |
279 | */ | |
5705f702 | 280 | rq_for_each_segment(bvec, req, iter) { |
6c92e699 | 281 | flags = 0; |
4550dd6c | 282 | if (!rq_iter_last(bvec, iter)) |
6c92e699 | 283 | flags = MSG_MORE; |
d18509f5 MP |
284 | dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n", |
285 | req, bvec.bv_len); | |
7988613b | 286 | result = sock_send_bvec(nbd, &bvec, flags); |
6c92e699 | 287 | if (result <= 0) { |
f4507164 | 288 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
289 | "Send data failed (result %d)\n", |
290 | result); | |
dab5313a | 291 | return -EIO; |
6c92e699 | 292 | } |
1da177e4 LT |
293 | } |
294 | } | |
1da177e4 | 295 | return 0; |
1da177e4 LT |
296 | } |
297 | ||
f4507164 | 298 | static struct request *nbd_find_request(struct nbd_device *nbd, |
0cbc591b | 299 | struct request *xreq) |
1da177e4 | 300 | { |
d2c9740b | 301 | struct request *req, *tmp; |
4b2f0260 | 302 | int err; |
1da177e4 | 303 | |
f4507164 | 304 | err = wait_event_interruptible(nbd->active_wq, nbd->active_req != xreq); |
4b2f0260 | 305 | if (unlikely(err)) |
de9ad6d4 | 306 | return ERR_PTR(err); |
4b2f0260 | 307 | |
f4507164 WG |
308 | spin_lock(&nbd->queue_lock); |
309 | list_for_each_entry_safe(req, tmp, &nbd->queue_head, queuelist) { | |
1da177e4 LT |
310 | if (req != xreq) |
311 | continue; | |
312 | list_del_init(&req->queuelist); | |
f4507164 | 313 | spin_unlock(&nbd->queue_lock); |
1da177e4 LT |
314 | return req; |
315 | } | |
f4507164 | 316 | spin_unlock(&nbd->queue_lock); |
4b2f0260 | 317 | |
de9ad6d4 | 318 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
319 | } |
320 | ||
f4507164 | 321 | static inline int sock_recv_bvec(struct nbd_device *nbd, struct bio_vec *bvec) |
1da177e4 LT |
322 | { |
323 | int result; | |
324 | void *kaddr = kmap(bvec->bv_page); | |
f4507164 | 325 | result = sock_xmit(nbd, 0, kaddr + bvec->bv_offset, bvec->bv_len, |
1da177e4 LT |
326 | MSG_WAITALL); |
327 | kunmap(bvec->bv_page); | |
328 | return result; | |
329 | } | |
330 | ||
331 | /* NULL returned = something went wrong, inform userspace */ | |
f4507164 | 332 | static struct request *nbd_read_stat(struct nbd_device *nbd) |
1da177e4 LT |
333 | { |
334 | int result; | |
335 | struct nbd_reply reply; | |
336 | struct request *req; | |
1da177e4 LT |
337 | |
338 | reply.magic = 0; | |
f4507164 | 339 | result = sock_xmit(nbd, 0, &reply, sizeof(reply), MSG_WAITALL); |
1da177e4 | 340 | if (result <= 0) { |
f4507164 | 341 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 | 342 | "Receive control failed (result %d)\n", result); |
19391830 | 343 | return ERR_PTR(result); |
1da177e4 | 344 | } |
e4b57e08 MF |
345 | |
346 | if (ntohl(reply.magic) != NBD_REPLY_MAGIC) { | |
f4507164 | 347 | dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n", |
e4b57e08 | 348 | (unsigned long)ntohl(reply.magic)); |
19391830 | 349 | return ERR_PTR(-EPROTO); |
e4b57e08 MF |
350 | } |
351 | ||
f4507164 | 352 | req = nbd_find_request(nbd, *(struct request **)reply.handle); |
801678c5 | 353 | if (IS_ERR(req)) { |
4b2f0260 HX |
354 | result = PTR_ERR(req); |
355 | if (result != -ENOENT) | |
19391830 | 356 | return ERR_PTR(result); |
4b2f0260 | 357 | |
f4507164 | 358 | dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%p)\n", |
7f1b90f9 | 359 | reply.handle); |
19391830 | 360 | return ERR_PTR(-EBADR); |
1da177e4 LT |
361 | } |
362 | ||
1da177e4 | 363 | if (ntohl(reply.error)) { |
f4507164 | 364 | dev_err(disk_to_dev(nbd->disk), "Other side returned error (%d)\n", |
7f1b90f9 | 365 | ntohl(reply.error)); |
1da177e4 LT |
366 | req->errors++; |
367 | return req; | |
368 | } | |
369 | ||
d18509f5 | 370 | dev_dbg(nbd_to_dev(nbd), "request %p: got reply\n", req); |
9dc6c806 | 371 | if (rq_data_dir(req) != WRITE) { |
5705f702 | 372 | struct req_iterator iter; |
7988613b | 373 | struct bio_vec bvec; |
5705f702 N |
374 | |
375 | rq_for_each_segment(bvec, req, iter) { | |
7988613b | 376 | result = sock_recv_bvec(nbd, &bvec); |
6c92e699 | 377 | if (result <= 0) { |
f4507164 | 378 | dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n", |
7f1b90f9 | 379 | result); |
6c92e699 JA |
380 | req->errors++; |
381 | return req; | |
382 | } | |
d18509f5 MP |
383 | dev_dbg(nbd_to_dev(nbd), "request %p: got %d bytes data\n", |
384 | req, bvec.bv_len); | |
1da177e4 LT |
385 | } |
386 | } | |
387 | return req; | |
1da177e4 LT |
388 | } |
389 | ||
edfaa7c3 KS |
390 | static ssize_t pid_show(struct device *dev, |
391 | struct device_attribute *attr, char *buf) | |
6b39bb65 | 392 | { |
edfaa7c3 | 393 | struct gendisk *disk = dev_to_disk(dev); |
6521d39a | 394 | struct nbd_device *nbd = (struct nbd_device *)disk->private_data; |
edfaa7c3 | 395 | |
6521d39a | 396 | return sprintf(buf, "%d\n", task_pid_nr(nbd->task_recv)); |
6b39bb65 PC |
397 | } |
398 | ||
edfaa7c3 | 399 | static struct device_attribute pid_attr = { |
01e8ef11 | 400 | .attr = { .name = "pid", .mode = S_IRUGO}, |
6b39bb65 PC |
401 | .show = pid_show, |
402 | }; | |
403 | ||
cad73b27 | 404 | static int nbd_thread_recv(struct nbd_device *nbd) |
1da177e4 LT |
405 | { |
406 | struct request *req; | |
84963048 | 407 | int ret; |
1da177e4 | 408 | |
f4507164 | 409 | BUG_ON(nbd->magic != NBD_MAGIC); |
1da177e4 | 410 | |
7f338fe4 | 411 | sk_set_memalloc(nbd->sock->sk); |
6521d39a MP |
412 | |
413 | nbd->task_recv = current; | |
414 | ||
f4507164 | 415 | ret = device_create_file(disk_to_dev(nbd->disk), &pid_attr); |
84963048 | 416 | if (ret) { |
f4507164 | 417 | dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n"); |
dcc909d9 | 418 | |
6521d39a | 419 | nbd->task_recv = NULL; |
dcc909d9 | 420 | |
84963048 WC |
421 | return ret; |
422 | } | |
6b39bb65 | 423 | |
19391830 MP |
424 | while (1) { |
425 | req = nbd_read_stat(nbd); | |
426 | if (IS_ERR(req)) { | |
427 | ret = PTR_ERR(req); | |
428 | break; | |
429 | } | |
430 | ||
d18509f5 | 431 | nbd_end_request(nbd, req); |
19391830 | 432 | } |
6b39bb65 | 433 | |
6521d39a MP |
434 | device_remove_file(disk_to_dev(nbd->disk), &pid_attr); |
435 | ||
7e2893a1 | 436 | nbd->task_recv = NULL; |
7e2893a1 | 437 | |
7e2893a1 | 438 | return ret; |
1da177e4 LT |
439 | } |
440 | ||
f4507164 | 441 | static void nbd_clear_que(struct nbd_device *nbd) |
1da177e4 LT |
442 | { |
443 | struct request *req; | |
444 | ||
f4507164 | 445 | BUG_ON(nbd->magic != NBD_MAGIC); |
1da177e4 | 446 | |
4b2f0260 | 447 | /* |
f4507164 | 448 | * Because we have set nbd->sock to NULL under the tx_lock, all |
4b2f0260 HX |
449 | * modifications to the list must have completed by now. For |
450 | * the same reason, the active_req must be NULL. | |
451 | * | |
452 | * As a consequence, we don't need to take the spin lock while | |
453 | * purging the list here. | |
454 | */ | |
f4507164 WG |
455 | BUG_ON(nbd->sock); |
456 | BUG_ON(nbd->active_req); | |
4b2f0260 | 457 | |
f4507164 WG |
458 | while (!list_empty(&nbd->queue_head)) { |
459 | req = list_entry(nbd->queue_head.next, struct request, | |
4b2f0260 HX |
460 | queuelist); |
461 | list_del_init(&req->queuelist); | |
462 | req->errors++; | |
d18509f5 | 463 | nbd_end_request(nbd, req); |
4b2f0260 | 464 | } |
fded4e09 PC |
465 | |
466 | while (!list_empty(&nbd->waiting_queue)) { | |
467 | req = list_entry(nbd->waiting_queue.next, struct request, | |
468 | queuelist); | |
469 | list_del_init(&req->queuelist); | |
470 | req->errors++; | |
d18509f5 | 471 | nbd_end_request(nbd, req); |
fded4e09 | 472 | } |
e78273c8 | 473 | dev_dbg(disk_to_dev(nbd->disk), "queue cleared\n"); |
1da177e4 LT |
474 | } |
475 | ||
7fdfd406 | 476 | |
f4507164 | 477 | static void nbd_handle_req(struct nbd_device *nbd, struct request *req) |
48cf6061 | 478 | { |
33659ebb | 479 | if (req->cmd_type != REQ_TYPE_FS) |
48cf6061 LV |
480 | goto error_out; |
481 | ||
9dc6c806 CH |
482 | if (rq_data_dir(req) == WRITE && |
483 | (nbd->flags & NBD_FLAG_READ_ONLY)) { | |
484 | dev_err(disk_to_dev(nbd->disk), | |
485 | "Write on read-only\n"); | |
486 | goto error_out; | |
75f187ab AB |
487 | } |
488 | ||
48cf6061 LV |
489 | req->errors = 0; |
490 | ||
f4507164 WG |
491 | mutex_lock(&nbd->tx_lock); |
492 | if (unlikely(!nbd->sock)) { | |
493 | mutex_unlock(&nbd->tx_lock); | |
494 | dev_err(disk_to_dev(nbd->disk), | |
7f1b90f9 | 495 | "Attempted send on closed socket\n"); |
15746fca | 496 | goto error_out; |
48cf6061 LV |
497 | } |
498 | ||
f4507164 | 499 | nbd->active_req = req; |
48cf6061 | 500 | |
7e2893a1 MP |
501 | if (nbd->xmit_timeout && list_empty_careful(&nbd->queue_head)) |
502 | mod_timer(&nbd->timeout_timer, jiffies + nbd->xmit_timeout); | |
503 | ||
f4507164 WG |
504 | if (nbd_send_req(nbd, req) != 0) { |
505 | dev_err(disk_to_dev(nbd->disk), "Request send failed\n"); | |
48cf6061 | 506 | req->errors++; |
d18509f5 | 507 | nbd_end_request(nbd, req); |
48cf6061 | 508 | } else { |
f4507164 | 509 | spin_lock(&nbd->queue_lock); |
01ff5dbc | 510 | list_add_tail(&req->queuelist, &nbd->queue_head); |
f4507164 | 511 | spin_unlock(&nbd->queue_lock); |
48cf6061 LV |
512 | } |
513 | ||
f4507164 WG |
514 | nbd->active_req = NULL; |
515 | mutex_unlock(&nbd->tx_lock); | |
516 | wake_up_all(&nbd->active_wq); | |
48cf6061 LV |
517 | |
518 | return; | |
519 | ||
520 | error_out: | |
521 | req->errors++; | |
d18509f5 | 522 | nbd_end_request(nbd, req); |
48cf6061 LV |
523 | } |
524 | ||
cad73b27 | 525 | static int nbd_thread_send(void *data) |
48cf6061 | 526 | { |
f4507164 | 527 | struct nbd_device *nbd = data; |
48cf6061 LV |
528 | struct request *req; |
529 | ||
7e2893a1 MP |
530 | nbd->task_send = current; |
531 | ||
8698a745 | 532 | set_user_nice(current, MIN_NICE); |
f4507164 | 533 | while (!kthread_should_stop() || !list_empty(&nbd->waiting_queue)) { |
48cf6061 | 534 | /* wait for something to do */ |
f4507164 | 535 | wait_event_interruptible(nbd->waiting_wq, |
48cf6061 | 536 | kthread_should_stop() || |
f4507164 | 537 | !list_empty(&nbd->waiting_queue)); |
48cf6061 LV |
538 | |
539 | /* extract request */ | |
f4507164 | 540 | if (list_empty(&nbd->waiting_queue)) |
48cf6061 LV |
541 | continue; |
542 | ||
f4507164 WG |
543 | spin_lock_irq(&nbd->queue_lock); |
544 | req = list_entry(nbd->waiting_queue.next, struct request, | |
48cf6061 LV |
545 | queuelist); |
546 | list_del_init(&req->queuelist); | |
f4507164 | 547 | spin_unlock_irq(&nbd->queue_lock); |
48cf6061 LV |
548 | |
549 | /* handle request */ | |
f4507164 | 550 | nbd_handle_req(nbd, req); |
48cf6061 | 551 | } |
7e2893a1 MP |
552 | |
553 | nbd->task_send = NULL; | |
554 | ||
48cf6061 LV |
555 | return 0; |
556 | } | |
557 | ||
1da177e4 LT |
558 | /* |
559 | * We always wait for result of write, for now. It would be nice to make it optional | |
560 | * in future | |
f4507164 | 561 | * if ((rq_data_dir(req) == WRITE) && (nbd->flags & NBD_WRITE_NOCHK)) |
1da177e4 LT |
562 | * { printk( "Warning: Ignoring result!\n"); nbd_end_request( req ); } |
563 | */ | |
564 | ||
cad73b27 | 565 | static void nbd_request_handler(struct request_queue *q) |
398eb085 | 566 | __releases(q->queue_lock) __acquires(q->queue_lock) |
1da177e4 LT |
567 | { |
568 | struct request *req; | |
569 | ||
9934c8c0 | 570 | while ((req = blk_fetch_request(q)) != NULL) { |
f4507164 | 571 | struct nbd_device *nbd; |
1da177e4 | 572 | |
48cf6061 LV |
573 | spin_unlock_irq(q->queue_lock); |
574 | ||
f4507164 | 575 | nbd = req->rq_disk->private_data; |
1da177e4 | 576 | |
f4507164 | 577 | BUG_ON(nbd->magic != NBD_MAGIC); |
1da177e4 | 578 | |
d18509f5 MP |
579 | dev_dbg(nbd_to_dev(nbd), "request %p: dequeued (flags=%x)\n", |
580 | req, req->cmd_type); | |
581 | ||
f4507164 WG |
582 | if (unlikely(!nbd->sock)) { |
583 | dev_err(disk_to_dev(nbd->disk), | |
7f1b90f9 | 584 | "Attempted send on closed socket\n"); |
4d48a542 | 585 | req->errors++; |
d18509f5 | 586 | nbd_end_request(nbd, req); |
4d48a542 PC |
587 | spin_lock_irq(q->queue_lock); |
588 | continue; | |
589 | } | |
590 | ||
f4507164 WG |
591 | spin_lock_irq(&nbd->queue_lock); |
592 | list_add_tail(&req->queuelist, &nbd->waiting_queue); | |
593 | spin_unlock_irq(&nbd->queue_lock); | |
1da177e4 | 594 | |
f4507164 | 595 | wake_up(&nbd->waiting_wq); |
4b2f0260 | 596 | |
1da177e4 | 597 | spin_lock_irq(q->queue_lock); |
1da177e4 | 598 | } |
1da177e4 LT |
599 | } |
600 | ||
23272a67 MP |
601 | static int nbd_set_socket(struct nbd_device *nbd, struct socket *sock) |
602 | { | |
603 | int ret = 0; | |
604 | ||
605 | spin_lock_irq(&nbd->sock_lock); | |
606 | ||
607 | if (nbd->sock) { | |
608 | ret = -EBUSY; | |
609 | goto out; | |
610 | } | |
611 | ||
612 | nbd->sock = sock; | |
613 | ||
614 | out: | |
615 | spin_unlock_irq(&nbd->sock_lock); | |
616 | ||
617 | return ret; | |
618 | } | |
619 | ||
30d53d9c MP |
620 | static int nbd_dev_dbg_init(struct nbd_device *nbd); |
621 | static void nbd_dev_dbg_close(struct nbd_device *nbd); | |
622 | ||
1a2ad211 | 623 | /* Must be called with tx_lock held */ |
1da177e4 | 624 | |
f4507164 | 625 | static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, |
1a2ad211 PM |
626 | unsigned int cmd, unsigned long arg) |
627 | { | |
1da177e4 | 628 | switch (cmd) { |
1a2ad211 PM |
629 | case NBD_DISCONNECT: { |
630 | struct request sreq; | |
631 | ||
f4507164 | 632 | dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n"); |
3a2d63f8 PB |
633 | if (!nbd->sock) |
634 | return -EINVAL; | |
1a2ad211 | 635 | |
3a2d63f8 PB |
636 | mutex_unlock(&nbd->tx_lock); |
637 | fsync_bdev(bdev); | |
638 | mutex_lock(&nbd->tx_lock); | |
4f54eec8 | 639 | blk_rq_init(NULL, &sreq); |
4f8c9510 | 640 | sreq.cmd_type = REQ_TYPE_DRV_PRIV; |
3a2d63f8 PB |
641 | |
642 | /* Check again after getting mutex back. */ | |
f4507164 | 643 | if (!nbd->sock) |
1da177e4 | 644 | return -EINVAL; |
3a2d63f8 | 645 | |
696697cb | 646 | nbd->disconnect = true; |
c378f70a | 647 | |
f4507164 | 648 | nbd_send_req(nbd, &sreq); |
c378f70a | 649 | return 0; |
1a2ad211 | 650 | } |
1da177e4 | 651 | |
23272a67 MP |
652 | case NBD_CLEAR_SOCK: |
653 | sock_shutdown(nbd); | |
f4507164 WG |
654 | nbd_clear_que(nbd); |
655 | BUG_ON(!list_empty(&nbd->queue_head)); | |
fded4e09 | 656 | BUG_ON(!list_empty(&nbd->waiting_queue)); |
3a2d63f8 | 657 | kill_bdev(bdev); |
1a2ad211 | 658 | return 0; |
1a2ad211 PM |
659 | |
660 | case NBD_SET_SOCK: { | |
e2511578 | 661 | int err; |
23272a67 MP |
662 | struct socket *sock = sockfd_lookup(arg, &err); |
663 | ||
664 | if (!sock) | |
665 | return err; | |
666 | ||
667 | err = nbd_set_socket(nbd, sock); | |
668 | if (!err && max_part) | |
669 | bdev->bd_invalidated = 1; | |
670 | ||
671 | return err; | |
1a2ad211 PM |
672 | } |
673 | ||
1da177e4 | 674 | case NBD_SET_BLKSIZE: |
f4507164 WG |
675 | nbd->blksize = arg; |
676 | nbd->bytesize &= ~(nbd->blksize-1); | |
677 | bdev->bd_inode->i_size = nbd->bytesize; | |
678 | set_blocksize(bdev, nbd->blksize); | |
679 | set_capacity(nbd->disk, nbd->bytesize >> 9); | |
1da177e4 | 680 | return 0; |
1a2ad211 | 681 | |
1da177e4 | 682 | case NBD_SET_SIZE: |
f4507164 WG |
683 | nbd->bytesize = arg & ~(nbd->blksize-1); |
684 | bdev->bd_inode->i_size = nbd->bytesize; | |
685 | set_blocksize(bdev, nbd->blksize); | |
686 | set_capacity(nbd->disk, nbd->bytesize >> 9); | |
1da177e4 | 687 | return 0; |
1a2ad211 | 688 | |
7fdfd406 | 689 | case NBD_SET_TIMEOUT: |
f4507164 | 690 | nbd->xmit_timeout = arg * HZ; |
7e2893a1 MP |
691 | if (arg) |
692 | mod_timer(&nbd->timeout_timer, | |
693 | jiffies + nbd->xmit_timeout); | |
694 | else | |
695 | del_timer_sync(&nbd->timeout_timer); | |
696 | ||
7fdfd406 | 697 | return 0; |
1a2ad211 | 698 | |
2f012508 PC |
699 | case NBD_SET_FLAGS: |
700 | nbd->flags = arg; | |
701 | return 0; | |
702 | ||
1da177e4 | 703 | case NBD_SET_SIZE_BLOCKS: |
f4507164 WG |
704 | nbd->bytesize = ((u64) arg) * nbd->blksize; |
705 | bdev->bd_inode->i_size = nbd->bytesize; | |
706 | set_blocksize(bdev, nbd->blksize); | |
707 | set_capacity(nbd->disk, nbd->bytesize >> 9); | |
1da177e4 | 708 | return 0; |
1a2ad211 PM |
709 | |
710 | case NBD_DO_IT: { | |
711 | struct task_struct *thread; | |
1a2ad211 PM |
712 | int error; |
713 | ||
6521d39a | 714 | if (nbd->task_recv) |
c91192d6 | 715 | return -EBUSY; |
e2511578 | 716 | if (!nbd->sock) |
1da177e4 | 717 | return -EINVAL; |
1a2ad211 | 718 | |
f4507164 | 719 | mutex_unlock(&nbd->tx_lock); |
1a2ad211 | 720 | |
a83e814b PB |
721 | if (nbd->flags & NBD_FLAG_READ_ONLY) |
722 | set_device_ro(bdev, true); | |
a336d298 PC |
723 | if (nbd->flags & NBD_FLAG_SEND_TRIM) |
724 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
725 | nbd->disk->queue); | |
75f187ab AB |
726 | if (nbd->flags & NBD_FLAG_SEND_FLUSH) |
727 | blk_queue_flush(nbd->disk->queue, REQ_FLUSH); | |
728 | else | |
729 | blk_queue_flush(nbd->disk->queue, 0); | |
a336d298 | 730 | |
cad73b27 | 731 | thread = kthread_run(nbd_thread_send, nbd, "%s", |
30d53d9c | 732 | nbd_name(nbd)); |
1a2ad211 | 733 | if (IS_ERR(thread)) { |
f4507164 | 734 | mutex_lock(&nbd->tx_lock); |
48cf6061 | 735 | return PTR_ERR(thread); |
1a2ad211 | 736 | } |
d06df60b | 737 | |
30d53d9c | 738 | nbd_dev_dbg_init(nbd); |
cad73b27 | 739 | error = nbd_thread_recv(nbd); |
30d53d9c | 740 | nbd_dev_dbg_close(nbd); |
48cf6061 | 741 | kthread_stop(thread); |
1a2ad211 | 742 | |
f4507164 | 743 | mutex_lock(&nbd->tx_lock); |
19391830 | 744 | |
36e47bee | 745 | sock_shutdown(nbd); |
f4507164 | 746 | nbd_clear_que(nbd); |
3a2d63f8 | 747 | kill_bdev(bdev); |
a336d298 | 748 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); |
a83e814b | 749 | set_device_ro(bdev, false); |
75f187ab | 750 | nbd->flags = 0; |
f4507164 | 751 | nbd->bytesize = 0; |
a8cdc308 | 752 | bdev->bd_inode->i_size = 0; |
f4507164 | 753 | set_capacity(nbd->disk, 0); |
d71a6d73 | 754 | if (max_part > 0) |
9dcd1379 | 755 | blkdev_reread_part(bdev); |
c378f70a PC |
756 | if (nbd->disconnect) /* user requested, ignore socket errors */ |
757 | return 0; | |
19391830 | 758 | return error; |
1a2ad211 PM |
759 | } |
760 | ||
1da177e4 | 761 | case NBD_CLEAR_QUE: |
4b2f0260 HX |
762 | /* |
763 | * This is for compatibility only. The queue is always cleared | |
764 | * by NBD_DO_IT or NBD_CLEAR_SOCK. | |
765 | */ | |
1da177e4 | 766 | return 0; |
1a2ad211 | 767 | |
1da177e4 | 768 | case NBD_PRINT_DEBUG: |
f4507164 | 769 | dev_info(disk_to_dev(nbd->disk), |
5eedf541 | 770 | "next = %p, prev = %p, head = %p\n", |
f4507164 WG |
771 | nbd->queue_head.next, nbd->queue_head.prev, |
772 | &nbd->queue_head); | |
1da177e4 LT |
773 | return 0; |
774 | } | |
1a2ad211 PM |
775 | return -ENOTTY; |
776 | } | |
777 | ||
778 | static int nbd_ioctl(struct block_device *bdev, fmode_t mode, | |
779 | unsigned int cmd, unsigned long arg) | |
780 | { | |
f4507164 | 781 | struct nbd_device *nbd = bdev->bd_disk->private_data; |
1a2ad211 PM |
782 | int error; |
783 | ||
784 | if (!capable(CAP_SYS_ADMIN)) | |
785 | return -EPERM; | |
786 | ||
f4507164 | 787 | BUG_ON(nbd->magic != NBD_MAGIC); |
1a2ad211 | 788 | |
f4507164 WG |
789 | mutex_lock(&nbd->tx_lock); |
790 | error = __nbd_ioctl(bdev, nbd, cmd, arg); | |
791 | mutex_unlock(&nbd->tx_lock); | |
1a2ad211 PM |
792 | |
793 | return error; | |
1da177e4 LT |
794 | } |
795 | ||
83d5cde4 | 796 | static const struct block_device_operations nbd_fops = |
1da177e4 LT |
797 | { |
798 | .owner = THIS_MODULE, | |
8a6cfeb6 | 799 | .ioctl = nbd_ioctl, |
263a3df1 | 800 | .compat_ioctl = nbd_ioctl, |
1da177e4 LT |
801 | }; |
802 | ||
30d53d9c MP |
803 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
804 | ||
805 | static int nbd_dbg_tasks_show(struct seq_file *s, void *unused) | |
806 | { | |
807 | struct nbd_device *nbd = s->private; | |
808 | ||
809 | if (nbd->task_recv) | |
810 | seq_printf(s, "recv: %d\n", task_pid_nr(nbd->task_recv)); | |
811 | if (nbd->task_send) | |
812 | seq_printf(s, "send: %d\n", task_pid_nr(nbd->task_send)); | |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
817 | static int nbd_dbg_tasks_open(struct inode *inode, struct file *file) | |
818 | { | |
819 | return single_open(file, nbd_dbg_tasks_show, inode->i_private); | |
820 | } | |
821 | ||
822 | static const struct file_operations nbd_dbg_tasks_ops = { | |
823 | .open = nbd_dbg_tasks_open, | |
824 | .read = seq_read, | |
825 | .llseek = seq_lseek, | |
826 | .release = single_release, | |
827 | }; | |
828 | ||
829 | static int nbd_dbg_flags_show(struct seq_file *s, void *unused) | |
830 | { | |
831 | struct nbd_device *nbd = s->private; | |
832 | u32 flags = nbd->flags; | |
833 | ||
834 | seq_printf(s, "Hex: 0x%08x\n\n", flags); | |
835 | ||
836 | seq_puts(s, "Known flags:\n"); | |
837 | ||
838 | if (flags & NBD_FLAG_HAS_FLAGS) | |
839 | seq_puts(s, "NBD_FLAG_HAS_FLAGS\n"); | |
840 | if (flags & NBD_FLAG_READ_ONLY) | |
841 | seq_puts(s, "NBD_FLAG_READ_ONLY\n"); | |
842 | if (flags & NBD_FLAG_SEND_FLUSH) | |
843 | seq_puts(s, "NBD_FLAG_SEND_FLUSH\n"); | |
844 | if (flags & NBD_FLAG_SEND_TRIM) | |
845 | seq_puts(s, "NBD_FLAG_SEND_TRIM\n"); | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | static int nbd_dbg_flags_open(struct inode *inode, struct file *file) | |
851 | { | |
852 | return single_open(file, nbd_dbg_flags_show, inode->i_private); | |
853 | } | |
854 | ||
855 | static const struct file_operations nbd_dbg_flags_ops = { | |
856 | .open = nbd_dbg_flags_open, | |
857 | .read = seq_read, | |
858 | .llseek = seq_lseek, | |
859 | .release = single_release, | |
860 | }; | |
861 | ||
862 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
863 | { | |
864 | struct dentry *dir; | |
27ea43fe MP |
865 | |
866 | if (!nbd_dbg_dir) | |
867 | return -EIO; | |
30d53d9c MP |
868 | |
869 | dir = debugfs_create_dir(nbd_name(nbd), nbd_dbg_dir); | |
27ea43fe MP |
870 | if (!dir) { |
871 | dev_err(nbd_to_dev(nbd), "Failed to create debugfs dir for '%s'\n", | |
872 | nbd_name(nbd)); | |
873 | return -EIO; | |
30d53d9c MP |
874 | } |
875 | nbd->dbg_dir = dir; | |
876 | ||
27ea43fe MP |
877 | debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_ops); |
878 | debugfs_create_u64("size_bytes", 0444, dir, &nbd->bytesize); | |
879 | debugfs_create_u32("timeout", 0444, dir, &nbd->xmit_timeout); | |
880 | debugfs_create_u32("blocksize", 0444, dir, &nbd->blksize); | |
881 | debugfs_create_file("flags", 0444, dir, &nbd, &nbd_dbg_flags_ops); | |
30d53d9c MP |
882 | |
883 | return 0; | |
884 | } | |
885 | ||
886 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
887 | { | |
888 | debugfs_remove_recursive(nbd->dbg_dir); | |
889 | } | |
890 | ||
891 | static int nbd_dbg_init(void) | |
892 | { | |
893 | struct dentry *dbg_dir; | |
894 | ||
895 | dbg_dir = debugfs_create_dir("nbd", NULL); | |
27ea43fe MP |
896 | if (!dbg_dir) |
897 | return -EIO; | |
30d53d9c MP |
898 | |
899 | nbd_dbg_dir = dbg_dir; | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
904 | static void nbd_dbg_close(void) | |
905 | { | |
906 | debugfs_remove_recursive(nbd_dbg_dir); | |
907 | } | |
908 | ||
909 | #else /* IS_ENABLED(CONFIG_DEBUG_FS) */ | |
910 | ||
911 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
912 | { | |
913 | return 0; | |
914 | } | |
915 | ||
916 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
917 | { | |
918 | } | |
919 | ||
920 | static int nbd_dbg_init(void) | |
921 | { | |
922 | return 0; | |
923 | } | |
924 | ||
925 | static void nbd_dbg_close(void) | |
926 | { | |
927 | } | |
928 | ||
929 | #endif | |
930 | ||
1da177e4 LT |
931 | /* |
932 | * And here should be modules and kernel interface | |
933 | * (Just smiley confuses emacs :-) | |
934 | */ | |
935 | ||
936 | static int __init nbd_init(void) | |
937 | { | |
938 | int err = -ENOMEM; | |
939 | int i; | |
d71a6d73 | 940 | int part_shift; |
1da177e4 | 941 | |
5b7b18cc | 942 | BUILD_BUG_ON(sizeof(struct nbd_request) != 28); |
1da177e4 | 943 | |
d71a6d73 | 944 | if (max_part < 0) { |
7742ce4a | 945 | printk(KERN_ERR "nbd: max_part must be >= 0\n"); |
d71a6d73 LV |
946 | return -EINVAL; |
947 | } | |
948 | ||
949 | part_shift = 0; | |
5988ce23 | 950 | if (max_part > 0) { |
d71a6d73 LV |
951 | part_shift = fls(max_part); |
952 | ||
5988ce23 NK |
953 | /* |
954 | * Adjust max_part according to part_shift as it is exported | |
955 | * to user space so that user can know the max number of | |
956 | * partition kernel should be able to manage. | |
957 | * | |
958 | * Note that -1 is required because partition 0 is reserved | |
959 | * for the whole disk. | |
960 | */ | |
961 | max_part = (1UL << part_shift) - 1; | |
962 | } | |
963 | ||
3b271082 NK |
964 | if ((1UL << part_shift) > DISK_MAX_PARTS) |
965 | return -EINVAL; | |
966 | ||
967 | if (nbds_max > 1UL << (MINORBITS - part_shift)) | |
968 | return -EINVAL; | |
969 | ||
ff6b8090 SM |
970 | nbd_dev = kcalloc(nbds_max, sizeof(*nbd_dev), GFP_KERNEL); |
971 | if (!nbd_dev) | |
972 | return -ENOMEM; | |
973 | ||
40be0c28 | 974 | for (i = 0; i < nbds_max; i++) { |
d71a6d73 | 975 | struct gendisk *disk = alloc_disk(1 << part_shift); |
1da177e4 LT |
976 | if (!disk) |
977 | goto out; | |
978 | nbd_dev[i].disk = disk; | |
979 | /* | |
980 | * The new linux 2.5 block layer implementation requires | |
981 | * every gendisk to have its very own request_queue struct. | |
982 | * These structs are big so we dynamically allocate them. | |
983 | */ | |
cad73b27 | 984 | disk->queue = blk_init_queue(nbd_request_handler, &nbd_lock); |
1da177e4 LT |
985 | if (!disk->queue) { |
986 | put_disk(disk); | |
987 | goto out; | |
988 | } | |
31dcfab0 JA |
989 | /* |
990 | * Tell the block layer that we are not a rotational device | |
991 | */ | |
992 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, disk->queue); | |
b277da0a | 993 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, disk->queue); |
a336d298 | 994 | disk->queue->limits.discard_granularity = 512; |
2bb4cd5c | 995 | blk_queue_max_discard_sectors(disk->queue, UINT_MAX); |
a336d298 | 996 | disk->queue->limits.discard_zeroes_data = 0; |
078be02b MB |
997 | blk_queue_max_hw_sectors(disk->queue, 65536); |
998 | disk->queue->limits.max_sectors = 256; | |
1da177e4 LT |
999 | } |
1000 | ||
1001 | if (register_blkdev(NBD_MAJOR, "nbd")) { | |
1002 | err = -EIO; | |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | printk(KERN_INFO "nbd: registered device at major %d\n", NBD_MAJOR); | |
1da177e4 | 1007 | |
30d53d9c MP |
1008 | nbd_dbg_init(); |
1009 | ||
40be0c28 | 1010 | for (i = 0; i < nbds_max; i++) { |
1da177e4 | 1011 | struct gendisk *disk = nbd_dev[i].disk; |
f4507164 | 1012 | nbd_dev[i].magic = NBD_MAGIC; |
48cf6061 | 1013 | INIT_LIST_HEAD(&nbd_dev[i].waiting_queue); |
1da177e4 | 1014 | spin_lock_init(&nbd_dev[i].queue_lock); |
23272a67 | 1015 | spin_lock_init(&nbd_dev[i].sock_lock); |
1da177e4 | 1016 | INIT_LIST_HEAD(&nbd_dev[i].queue_head); |
82d4dc5a | 1017 | mutex_init(&nbd_dev[i].tx_lock); |
7e2893a1 MP |
1018 | init_timer(&nbd_dev[i].timeout_timer); |
1019 | nbd_dev[i].timeout_timer.function = nbd_xmit_timeout; | |
1020 | nbd_dev[i].timeout_timer.data = (unsigned long)&nbd_dev[i]; | |
4b2f0260 | 1021 | init_waitqueue_head(&nbd_dev[i].active_wq); |
48cf6061 | 1022 | init_waitqueue_head(&nbd_dev[i].waiting_wq); |
1da177e4 | 1023 | nbd_dev[i].blksize = 1024; |
4b86a872 | 1024 | nbd_dev[i].bytesize = 0; |
1da177e4 | 1025 | disk->major = NBD_MAJOR; |
d71a6d73 | 1026 | disk->first_minor = i << part_shift; |
1da177e4 LT |
1027 | disk->fops = &nbd_fops; |
1028 | disk->private_data = &nbd_dev[i]; | |
1da177e4 | 1029 | sprintf(disk->disk_name, "nbd%d", i); |
4b86a872 | 1030 | set_capacity(disk, 0); |
1da177e4 LT |
1031 | add_disk(disk); |
1032 | } | |
1033 | ||
1034 | return 0; | |
1035 | out: | |
1036 | while (i--) { | |
1037 | blk_cleanup_queue(nbd_dev[i].disk->queue); | |
1038 | put_disk(nbd_dev[i].disk); | |
1039 | } | |
f3944d61 | 1040 | kfree(nbd_dev); |
1da177e4 LT |
1041 | return err; |
1042 | } | |
1043 | ||
1044 | static void __exit nbd_cleanup(void) | |
1045 | { | |
1046 | int i; | |
30d53d9c MP |
1047 | |
1048 | nbd_dbg_close(); | |
1049 | ||
40be0c28 | 1050 | for (i = 0; i < nbds_max; i++) { |
1da177e4 | 1051 | struct gendisk *disk = nbd_dev[i].disk; |
40be0c28 | 1052 | nbd_dev[i].magic = 0; |
1da177e4 LT |
1053 | if (disk) { |
1054 | del_gendisk(disk); | |
1055 | blk_cleanup_queue(disk->queue); | |
1056 | put_disk(disk); | |
1057 | } | |
1058 | } | |
1da177e4 | 1059 | unregister_blkdev(NBD_MAJOR, "nbd"); |
f3944d61 | 1060 | kfree(nbd_dev); |
1da177e4 LT |
1061 | printk(KERN_INFO "nbd: unregistered device at major %d\n", NBD_MAJOR); |
1062 | } | |
1063 | ||
1064 | module_init(nbd_init); | |
1065 | module_exit(nbd_cleanup); | |
1066 | ||
1067 | MODULE_DESCRIPTION("Network Block Device"); | |
1068 | MODULE_LICENSE("GPL"); | |
1069 | ||
40be0c28 | 1070 | module_param(nbds_max, int, 0444); |
d71a6d73 LV |
1071 | MODULE_PARM_DESC(nbds_max, "number of network block devices to initialize (default: 16)"); |
1072 | module_param(max_part, int, 0444); | |
1073 | MODULE_PARM_DESC(max_part, "number of partitions per device (default: 0)"); |