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Commit | Line | Data |
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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> |
fd8383fd | 37 | #include <linux/blk-mq.h> |
1da177e4 | 38 | |
1da177e4 LT |
39 | #include <asm/uaccess.h> |
40 | #include <asm/types.h> | |
41 | ||
42 | #include <linux/nbd.h> | |
43 | ||
9b4a6ba9 JB |
44 | #define NBD_TIMEDOUT 0 |
45 | #define NBD_DISCONNECT_REQUESTED 1 | |
46 | ||
13e71d69 | 47 | struct nbd_device { |
22d109c1 | 48 | u32 flags; |
9b4a6ba9 | 49 | unsigned long runtime_flags; |
13e71d69 MP |
50 | struct socket * sock; /* If == NULL, device is not ready, yet */ |
51 | int magic; | |
52 | ||
fd8383fd | 53 | struct blk_mq_tag_set tag_set; |
13e71d69 MP |
54 | |
55 | struct mutex tx_lock; | |
56 | struct gendisk *disk; | |
57 | int blksize; | |
b9c495bb | 58 | loff_t bytesize; |
7e2893a1 | 59 | |
23272a67 MP |
60 | /* protects initialization and shutdown of the socket */ |
61 | spinlock_t sock_lock; | |
7e2893a1 MP |
62 | struct task_struct *task_recv; |
63 | struct task_struct *task_send; | |
30d53d9c MP |
64 | |
65 | #if IS_ENABLED(CONFIG_DEBUG_FS) | |
66 | struct dentry *dbg_dir; | |
67 | #endif | |
13e71d69 MP |
68 | }; |
69 | ||
fd8383fd JB |
70 | struct nbd_cmd { |
71 | struct nbd_device *nbd; | |
72 | struct list_head list; | |
73 | }; | |
74 | ||
30d53d9c MP |
75 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
76 | static struct dentry *nbd_dbg_dir; | |
77 | #endif | |
78 | ||
79 | #define nbd_name(nbd) ((nbd)->disk->disk_name) | |
80 | ||
f4507164 | 81 | #define NBD_MAGIC 0x68797548 |
1da177e4 | 82 | |
9c7a4169 | 83 | static unsigned int nbds_max = 16; |
20a8143e | 84 | static struct nbd_device *nbd_dev; |
d71a6d73 | 85 | static int max_part; |
1da177e4 | 86 | |
d18509f5 | 87 | static inline struct device *nbd_to_dev(struct nbd_device *nbd) |
1da177e4 | 88 | { |
d18509f5 | 89 | return disk_to_dev(nbd->disk); |
1da177e4 LT |
90 | } |
91 | ||
37091fdd MP |
92 | static bool nbd_is_connected(struct nbd_device *nbd) |
93 | { | |
94 | return !!nbd->task_recv; | |
95 | } | |
96 | ||
1da177e4 LT |
97 | static const char *nbdcmd_to_ascii(int cmd) |
98 | { | |
99 | switch (cmd) { | |
100 | case NBD_CMD_READ: return "read"; | |
101 | case NBD_CMD_WRITE: return "write"; | |
102 | case NBD_CMD_DISC: return "disconnect"; | |
75f187ab | 103 | case NBD_CMD_FLUSH: return "flush"; |
a336d298 | 104 | case NBD_CMD_TRIM: return "trim/discard"; |
1da177e4 LT |
105 | } |
106 | return "invalid"; | |
107 | } | |
1da177e4 | 108 | |
37091fdd MP |
109 | static int nbd_size_clear(struct nbd_device *nbd, struct block_device *bdev) |
110 | { | |
111 | bdev->bd_inode->i_size = 0; | |
112 | set_capacity(nbd->disk, 0); | |
113 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static void nbd_size_update(struct nbd_device *nbd, struct block_device *bdev) | |
119 | { | |
120 | if (!nbd_is_connected(nbd)) | |
121 | return; | |
122 | ||
123 | bdev->bd_inode->i_size = nbd->bytesize; | |
124 | set_capacity(nbd->disk, nbd->bytesize >> 9); | |
125 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); | |
126 | } | |
127 | ||
128 | static int nbd_size_set(struct nbd_device *nbd, struct block_device *bdev, | |
129 | int blocksize, int nr_blocks) | |
130 | { | |
131 | int ret; | |
132 | ||
133 | ret = set_blocksize(bdev, blocksize); | |
134 | if (ret) | |
135 | return ret; | |
136 | ||
137 | nbd->blksize = blocksize; | |
138 | nbd->bytesize = (loff_t)blocksize * (loff_t)nr_blocks; | |
139 | ||
140 | nbd_size_update(nbd, bdev); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
fd8383fd | 145 | static void nbd_end_request(struct nbd_cmd *cmd) |
1da177e4 | 146 | { |
fd8383fd JB |
147 | struct nbd_device *nbd = cmd->nbd; |
148 | struct request *req = blk_mq_rq_from_pdu(cmd); | |
097c94a4 | 149 | int error = req->errors ? -EIO : 0; |
1da177e4 | 150 | |
fd8383fd | 151 | dev_dbg(nbd_to_dev(nbd), "request %p: %s\n", cmd, |
d18509f5 | 152 | error ? "failed" : "done"); |
1da177e4 | 153 | |
fd8383fd | 154 | blk_mq_complete_request(req, error); |
1da177e4 LT |
155 | } |
156 | ||
e018e757 MP |
157 | /* |
158 | * Forcibly shutdown the socket causing all listeners to error | |
159 | */ | |
36e47bee | 160 | static void sock_shutdown(struct nbd_device *nbd) |
7fdfd406 | 161 | { |
c2611898 JB |
162 | struct socket *sock; |
163 | ||
0eadf37a | 164 | spin_lock(&nbd->sock_lock); |
23272a67 MP |
165 | |
166 | if (!nbd->sock) { | |
167 | spin_unlock_irq(&nbd->sock_lock); | |
260bbce4 | 168 | return; |
23272a67 | 169 | } |
260bbce4 | 170 | |
c2611898 | 171 | sock = nbd->sock; |
260bbce4 | 172 | dev_warn(disk_to_dev(nbd->disk), "shutting down socket\n"); |
260bbce4 | 173 | nbd->sock = NULL; |
0eadf37a | 174 | spin_unlock(&nbd->sock_lock); |
23272a67 | 175 | |
c2611898 JB |
176 | kernel_sock_shutdown(sock, SHUT_RDWR); |
177 | sockfd_put(sock); | |
7fdfd406 PC |
178 | } |
179 | ||
0eadf37a JB |
180 | static enum blk_eh_timer_return nbd_xmit_timeout(struct request *req, |
181 | bool reserved) | |
7fdfd406 | 182 | { |
0eadf37a JB |
183 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req); |
184 | struct nbd_device *nbd = cmd->nbd; | |
c2611898 | 185 | struct socket *sock = NULL; |
7e2893a1 | 186 | |
0eadf37a | 187 | spin_lock(&nbd->sock_lock); |
dcc909d9 | 188 | |
9b4a6ba9 | 189 | set_bit(NBD_TIMEDOUT, &nbd->runtime_flags); |
7fdfd406 | 190 | |
c2611898 JB |
191 | if (nbd->sock) { |
192 | sock = nbd->sock; | |
193 | get_file(sock->file); | |
194 | } | |
7e2893a1 | 195 | |
0eadf37a | 196 | spin_unlock(&nbd->sock_lock); |
c2611898 JB |
197 | if (sock) { |
198 | kernel_sock_shutdown(sock, SHUT_RDWR); | |
199 | sockfd_put(sock); | |
200 | } | |
dcc909d9 | 201 | |
0eadf37a | 202 | req->errors++; |
23272a67 | 203 | dev_err(nbd_to_dev(nbd), "Connection timed out, shutting down connection\n"); |
0eadf37a | 204 | return BLK_EH_HANDLED; |
7fdfd406 PC |
205 | } |
206 | ||
1da177e4 LT |
207 | /* |
208 | * Send or receive packet. | |
209 | */ | |
f4507164 | 210 | static int sock_xmit(struct nbd_device *nbd, int send, void *buf, int size, |
1da177e4 LT |
211 | int msg_flags) |
212 | { | |
f4507164 | 213 | struct socket *sock = nbd->sock; |
1da177e4 LT |
214 | int result; |
215 | struct msghdr msg; | |
216 | struct kvec iov; | |
7f338fe4 | 217 | unsigned long pflags = current->flags; |
1da177e4 | 218 | |
ffc41cf8 | 219 | if (unlikely(!sock)) { |
f4507164 | 220 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
221 | "Attempted %s on closed socket in sock_xmit\n", |
222 | (send ? "send" : "recv")); | |
ffc41cf8 MS |
223 | return -EINVAL; |
224 | } | |
225 | ||
7f338fe4 | 226 | current->flags |= PF_MEMALLOC; |
1da177e4 | 227 | do { |
7f338fe4 | 228 | sock->sk->sk_allocation = GFP_NOIO | __GFP_MEMALLOC; |
1da177e4 LT |
229 | iov.iov_base = buf; |
230 | iov.iov_len = size; | |
231 | msg.msg_name = NULL; | |
232 | msg.msg_namelen = 0; | |
233 | msg.msg_control = NULL; | |
234 | msg.msg_controllen = 0; | |
1da177e4 LT |
235 | msg.msg_flags = msg_flags | MSG_NOSIGNAL; |
236 | ||
7e2893a1 | 237 | if (send) |
1da177e4 | 238 | result = kernel_sendmsg(sock, &msg, &iov, 1, size); |
7e2893a1 | 239 | else |
35fbf5bc NK |
240 | result = kernel_recvmsg(sock, &msg, &iov, 1, size, |
241 | msg.msg_flags); | |
1da177e4 | 242 | |
1da177e4 LT |
243 | if (result <= 0) { |
244 | if (result == 0) | |
245 | result = -EPIPE; /* short read */ | |
246 | break; | |
247 | } | |
248 | size -= result; | |
249 | buf += result; | |
250 | } while (size > 0); | |
251 | ||
7f338fe4 | 252 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
1da177e4 LT |
253 | |
254 | return result; | |
255 | } | |
256 | ||
f4507164 | 257 | static inline int sock_send_bvec(struct nbd_device *nbd, struct bio_vec *bvec, |
1da177e4 LT |
258 | int flags) |
259 | { | |
260 | int result; | |
261 | void *kaddr = kmap(bvec->bv_page); | |
f4507164 WG |
262 | result = sock_xmit(nbd, 1, kaddr + bvec->bv_offset, |
263 | bvec->bv_len, flags); | |
1da177e4 LT |
264 | kunmap(bvec->bv_page); |
265 | return result; | |
266 | } | |
267 | ||
7fdfd406 | 268 | /* always call with the tx_lock held */ |
fd8383fd | 269 | static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd) |
1da177e4 | 270 | { |
fd8383fd | 271 | struct request *req = blk_mq_rq_from_pdu(cmd); |
5705f702 | 272 | int result, flags; |
1da177e4 | 273 | struct nbd_request request; |
1011c1b9 | 274 | unsigned long size = blk_rq_bytes(req); |
9dc6c806 CH |
275 | u32 type; |
276 | ||
277 | if (req->cmd_type == REQ_TYPE_DRV_PRIV) | |
278 | type = NBD_CMD_DISC; | |
c2df40df | 279 | else if (req_op(req) == REQ_OP_DISCARD) |
9dc6c806 | 280 | type = NBD_CMD_TRIM; |
3a5e02ce | 281 | else if (req_op(req) == REQ_OP_FLUSH) |
9dc6c806 CH |
282 | type = NBD_CMD_FLUSH; |
283 | else if (rq_data_dir(req) == WRITE) | |
284 | type = NBD_CMD_WRITE; | |
285 | else | |
286 | type = NBD_CMD_READ; | |
1da177e4 | 287 | |
04cfac4e | 288 | memset(&request, 0, sizeof(request)); |
1da177e4 | 289 | request.magic = htonl(NBD_REQUEST_MAGIC); |
9dc6c806 CH |
290 | request.type = htonl(type); |
291 | if (type != NBD_CMD_FLUSH && type != NBD_CMD_DISC) { | |
75f187ab AB |
292 | request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9); |
293 | request.len = htonl(size); | |
294 | } | |
fd8383fd | 295 | memcpy(request.handle, &req->tag, sizeof(req->tag)); |
1da177e4 | 296 | |
d18509f5 | 297 | dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n", |
fd8383fd | 298 | cmd, nbdcmd_to_ascii(type), |
d18509f5 | 299 | (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req)); |
f4507164 | 300 | result = sock_xmit(nbd, 1, &request, sizeof(request), |
9dc6c806 | 301 | (type == NBD_CMD_WRITE) ? MSG_MORE : 0); |
1da177e4 | 302 | if (result <= 0) { |
f4507164 | 303 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 | 304 | "Send control failed (result %d)\n", result); |
dab5313a | 305 | return -EIO; |
1da177e4 LT |
306 | } |
307 | ||
9dc6c806 | 308 | if (type == NBD_CMD_WRITE) { |
5705f702 | 309 | struct req_iterator iter; |
7988613b | 310 | struct bio_vec bvec; |
1da177e4 LT |
311 | /* |
312 | * we are really probing at internals to determine | |
313 | * whether to set MSG_MORE or not... | |
314 | */ | |
5705f702 | 315 | rq_for_each_segment(bvec, req, iter) { |
6c92e699 | 316 | flags = 0; |
4550dd6c | 317 | if (!rq_iter_last(bvec, iter)) |
6c92e699 | 318 | flags = MSG_MORE; |
d18509f5 | 319 | dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n", |
fd8383fd | 320 | cmd, bvec.bv_len); |
7988613b | 321 | result = sock_send_bvec(nbd, &bvec, flags); |
6c92e699 | 322 | if (result <= 0) { |
f4507164 | 323 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
324 | "Send data failed (result %d)\n", |
325 | result); | |
dab5313a | 326 | return -EIO; |
6c92e699 | 327 | } |
1da177e4 LT |
328 | } |
329 | } | |
1da177e4 | 330 | return 0; |
1da177e4 LT |
331 | } |
332 | ||
f4507164 | 333 | static inline int sock_recv_bvec(struct nbd_device *nbd, struct bio_vec *bvec) |
1da177e4 LT |
334 | { |
335 | int result; | |
336 | void *kaddr = kmap(bvec->bv_page); | |
f4507164 | 337 | result = sock_xmit(nbd, 0, kaddr + bvec->bv_offset, bvec->bv_len, |
1da177e4 LT |
338 | MSG_WAITALL); |
339 | kunmap(bvec->bv_page); | |
340 | return result; | |
341 | } | |
342 | ||
343 | /* NULL returned = something went wrong, inform userspace */ | |
fd8383fd | 344 | static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd) |
1da177e4 LT |
345 | { |
346 | int result; | |
347 | struct nbd_reply reply; | |
fd8383fd JB |
348 | struct nbd_cmd *cmd; |
349 | struct request *req = NULL; | |
350 | u16 hwq; | |
351 | int tag; | |
1da177e4 LT |
352 | |
353 | reply.magic = 0; | |
f4507164 | 354 | result = sock_xmit(nbd, 0, &reply, sizeof(reply), MSG_WAITALL); |
1da177e4 | 355 | if (result <= 0) { |
f4507164 | 356 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 | 357 | "Receive control failed (result %d)\n", result); |
19391830 | 358 | return ERR_PTR(result); |
1da177e4 | 359 | } |
e4b57e08 MF |
360 | |
361 | if (ntohl(reply.magic) != NBD_REPLY_MAGIC) { | |
f4507164 | 362 | dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n", |
e4b57e08 | 363 | (unsigned long)ntohl(reply.magic)); |
19391830 | 364 | return ERR_PTR(-EPROTO); |
e4b57e08 MF |
365 | } |
366 | ||
fd8383fd | 367 | memcpy(&tag, reply.handle, sizeof(int)); |
4b2f0260 | 368 | |
fd8383fd JB |
369 | hwq = blk_mq_unique_tag_to_hwq(tag); |
370 | if (hwq < nbd->tag_set.nr_hw_queues) | |
371 | req = blk_mq_tag_to_rq(nbd->tag_set.tags[hwq], | |
372 | blk_mq_unique_tag_to_tag(tag)); | |
373 | if (!req || !blk_mq_request_started(req)) { | |
374 | dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%d) %p\n", | |
375 | tag, req); | |
376 | return ERR_PTR(-ENOENT); | |
1da177e4 | 377 | } |
fd8383fd | 378 | cmd = blk_mq_rq_to_pdu(req); |
1da177e4 | 379 | |
1da177e4 | 380 | if (ntohl(reply.error)) { |
f4507164 | 381 | dev_err(disk_to_dev(nbd->disk), "Other side returned error (%d)\n", |
7f1b90f9 | 382 | ntohl(reply.error)); |
1da177e4 | 383 | req->errors++; |
fd8383fd | 384 | return cmd; |
1da177e4 LT |
385 | } |
386 | ||
fd8383fd | 387 | dev_dbg(nbd_to_dev(nbd), "request %p: got reply\n", cmd); |
9dc6c806 | 388 | if (rq_data_dir(req) != WRITE) { |
5705f702 | 389 | struct req_iterator iter; |
7988613b | 390 | struct bio_vec bvec; |
5705f702 N |
391 | |
392 | rq_for_each_segment(bvec, req, iter) { | |
7988613b | 393 | result = sock_recv_bvec(nbd, &bvec); |
6c92e699 | 394 | if (result <= 0) { |
f4507164 | 395 | dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n", |
7f1b90f9 | 396 | result); |
6c92e699 | 397 | req->errors++; |
fd8383fd | 398 | return cmd; |
6c92e699 | 399 | } |
d18509f5 | 400 | dev_dbg(nbd_to_dev(nbd), "request %p: got %d bytes data\n", |
fd8383fd | 401 | cmd, bvec.bv_len); |
1da177e4 LT |
402 | } |
403 | } | |
fd8383fd | 404 | return cmd; |
1da177e4 LT |
405 | } |
406 | ||
edfaa7c3 KS |
407 | static ssize_t pid_show(struct device *dev, |
408 | struct device_attribute *attr, char *buf) | |
6b39bb65 | 409 | { |
edfaa7c3 | 410 | struct gendisk *disk = dev_to_disk(dev); |
6521d39a | 411 | struct nbd_device *nbd = (struct nbd_device *)disk->private_data; |
edfaa7c3 | 412 | |
6521d39a | 413 | return sprintf(buf, "%d\n", task_pid_nr(nbd->task_recv)); |
6b39bb65 PC |
414 | } |
415 | ||
edfaa7c3 | 416 | static struct device_attribute pid_attr = { |
01e8ef11 | 417 | .attr = { .name = "pid", .mode = S_IRUGO}, |
6b39bb65 PC |
418 | .show = pid_show, |
419 | }; | |
420 | ||
37091fdd | 421 | static int nbd_thread_recv(struct nbd_device *nbd, struct block_device *bdev) |
1da177e4 | 422 | { |
fd8383fd | 423 | struct nbd_cmd *cmd; |
84963048 | 424 | int ret; |
1da177e4 | 425 | |
f4507164 | 426 | BUG_ON(nbd->magic != NBD_MAGIC); |
1da177e4 | 427 | |
7f338fe4 | 428 | sk_set_memalloc(nbd->sock->sk); |
6521d39a | 429 | |
f4507164 | 430 | ret = device_create_file(disk_to_dev(nbd->disk), &pid_attr); |
84963048 | 431 | if (ret) { |
f4507164 | 432 | dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n"); |
84963048 WC |
433 | return ret; |
434 | } | |
6b39bb65 | 435 | |
37091fdd MP |
436 | nbd_size_update(nbd, bdev); |
437 | ||
19391830 | 438 | while (1) { |
fd8383fd JB |
439 | cmd = nbd_read_stat(nbd); |
440 | if (IS_ERR(cmd)) { | |
441 | ret = PTR_ERR(cmd); | |
19391830 MP |
442 | break; |
443 | } | |
444 | ||
fd8383fd | 445 | nbd_end_request(cmd); |
19391830 | 446 | } |
6b39bb65 | 447 | |
37091fdd MP |
448 | nbd_size_clear(nbd, bdev); |
449 | ||
6521d39a | 450 | device_remove_file(disk_to_dev(nbd->disk), &pid_attr); |
7e2893a1 | 451 | return ret; |
1da177e4 LT |
452 | } |
453 | ||
fd8383fd | 454 | static void nbd_clear_req(struct request *req, void *data, bool reserved) |
1da177e4 | 455 | { |
fd8383fd | 456 | struct nbd_cmd *cmd; |
1da177e4 | 457 | |
fd8383fd JB |
458 | if (!blk_mq_request_started(req)) |
459 | return; | |
460 | cmd = blk_mq_rq_to_pdu(req); | |
461 | req->errors++; | |
462 | nbd_end_request(cmd); | |
463 | } | |
464 | ||
465 | static void nbd_clear_que(struct nbd_device *nbd) | |
466 | { | |
f4507164 | 467 | BUG_ON(nbd->magic != NBD_MAGIC); |
1da177e4 | 468 | |
4b2f0260 | 469 | /* |
f4507164 | 470 | * Because we have set nbd->sock to NULL under the tx_lock, all |
fd8383fd | 471 | * modifications to the list must have completed by now. |
4b2f0260 | 472 | */ |
f4507164 | 473 | BUG_ON(nbd->sock); |
4b2f0260 | 474 | |
fd8383fd | 475 | blk_mq_tagset_busy_iter(&nbd->tag_set, nbd_clear_req, NULL); |
e78273c8 | 476 | dev_dbg(disk_to_dev(nbd->disk), "queue cleared\n"); |
1da177e4 LT |
477 | } |
478 | ||
7fdfd406 | 479 | |
fd8383fd | 480 | static void nbd_handle_cmd(struct nbd_cmd *cmd) |
48cf6061 | 481 | { |
fd8383fd JB |
482 | struct request *req = blk_mq_rq_from_pdu(cmd); |
483 | struct nbd_device *nbd = cmd->nbd; | |
484 | ||
33659ebb | 485 | if (req->cmd_type != REQ_TYPE_FS) |
48cf6061 LV |
486 | goto error_out; |
487 | ||
9dc6c806 CH |
488 | if (rq_data_dir(req) == WRITE && |
489 | (nbd->flags & NBD_FLAG_READ_ONLY)) { | |
490 | dev_err(disk_to_dev(nbd->disk), | |
491 | "Write on read-only\n"); | |
492 | goto error_out; | |
75f187ab AB |
493 | } |
494 | ||
48cf6061 LV |
495 | req->errors = 0; |
496 | ||
f4507164 | 497 | mutex_lock(&nbd->tx_lock); |
fd8383fd | 498 | nbd->task_send = current; |
f4507164 WG |
499 | if (unlikely(!nbd->sock)) { |
500 | mutex_unlock(&nbd->tx_lock); | |
501 | dev_err(disk_to_dev(nbd->disk), | |
7f1b90f9 | 502 | "Attempted send on closed socket\n"); |
15746fca | 503 | goto error_out; |
48cf6061 LV |
504 | } |
505 | ||
fd8383fd | 506 | if (nbd_send_cmd(nbd, cmd) != 0) { |
f4507164 | 507 | dev_err(disk_to_dev(nbd->disk), "Request send failed\n"); |
48cf6061 | 508 | req->errors++; |
fd8383fd | 509 | nbd_end_request(cmd); |
48cf6061 LV |
510 | } |
511 | ||
fd8383fd | 512 | nbd->task_send = NULL; |
f4507164 | 513 | mutex_unlock(&nbd->tx_lock); |
48cf6061 LV |
514 | |
515 | return; | |
516 | ||
517 | error_out: | |
518 | req->errors++; | |
fd8383fd | 519 | nbd_end_request(cmd); |
48cf6061 LV |
520 | } |
521 | ||
fd8383fd JB |
522 | static int nbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
523 | const struct blk_mq_queue_data *bd) | |
1da177e4 | 524 | { |
fd8383fd | 525 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
1da177e4 | 526 | |
fd8383fd JB |
527 | blk_mq_start_request(bd->rq); |
528 | nbd_handle_cmd(cmd); | |
529 | return BLK_MQ_RQ_QUEUE_OK; | |
1da177e4 LT |
530 | } |
531 | ||
23272a67 MP |
532 | static int nbd_set_socket(struct nbd_device *nbd, struct socket *sock) |
533 | { | |
534 | int ret = 0; | |
535 | ||
536 | spin_lock_irq(&nbd->sock_lock); | |
537 | ||
538 | if (nbd->sock) { | |
539 | ret = -EBUSY; | |
540 | goto out; | |
541 | } | |
542 | ||
543 | nbd->sock = sock; | |
544 | ||
545 | out: | |
546 | spin_unlock_irq(&nbd->sock_lock); | |
547 | ||
548 | return ret; | |
549 | } | |
550 | ||
0e4f0f6f MP |
551 | /* Reset all properties of an NBD device */ |
552 | static void nbd_reset(struct nbd_device *nbd) | |
553 | { | |
9b4a6ba9 | 554 | nbd->runtime_flags = 0; |
0e4f0f6f MP |
555 | nbd->blksize = 1024; |
556 | nbd->bytesize = 0; | |
557 | set_capacity(nbd->disk, 0); | |
558 | nbd->flags = 0; | |
0eadf37a | 559 | nbd->tag_set.timeout = 0; |
0e4f0f6f | 560 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); |
0e4f0f6f MP |
561 | } |
562 | ||
563 | static void nbd_bdev_reset(struct block_device *bdev) | |
564 | { | |
565 | set_device_ro(bdev, false); | |
566 | bdev->bd_inode->i_size = 0; | |
567 | if (max_part > 0) { | |
568 | blkdev_reread_part(bdev); | |
569 | bdev->bd_invalidated = 1; | |
570 | } | |
571 | } | |
572 | ||
d02cf531 MP |
573 | static void nbd_parse_flags(struct nbd_device *nbd, struct block_device *bdev) |
574 | { | |
575 | if (nbd->flags & NBD_FLAG_READ_ONLY) | |
576 | set_device_ro(bdev, true); | |
577 | if (nbd->flags & NBD_FLAG_SEND_TRIM) | |
578 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); | |
579 | if (nbd->flags & NBD_FLAG_SEND_FLUSH) | |
aafb1eec | 580 | blk_queue_write_cache(nbd->disk->queue, true, false); |
d02cf531 | 581 | else |
aafb1eec | 582 | blk_queue_write_cache(nbd->disk->queue, false, false); |
d02cf531 MP |
583 | } |
584 | ||
30d53d9c MP |
585 | static int nbd_dev_dbg_init(struct nbd_device *nbd); |
586 | static void nbd_dev_dbg_close(struct nbd_device *nbd); | |
587 | ||
1a2ad211 | 588 | /* Must be called with tx_lock held */ |
1da177e4 | 589 | |
f4507164 | 590 | static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, |
1a2ad211 PM |
591 | unsigned int cmd, unsigned long arg) |
592 | { | |
1da177e4 | 593 | switch (cmd) { |
1a2ad211 | 594 | case NBD_DISCONNECT: { |
fd8383fd | 595 | struct request *sreq; |
1a2ad211 | 596 | |
f4507164 | 597 | dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n"); |
3a2d63f8 PB |
598 | if (!nbd->sock) |
599 | return -EINVAL; | |
1a2ad211 | 600 | |
fd8383fd JB |
601 | sreq = blk_mq_alloc_request(bdev_get_queue(bdev), WRITE, 0); |
602 | if (!sreq) | |
603 | return -ENOMEM; | |
604 | ||
3a2d63f8 PB |
605 | mutex_unlock(&nbd->tx_lock); |
606 | fsync_bdev(bdev); | |
607 | mutex_lock(&nbd->tx_lock); | |
fd8383fd | 608 | sreq->cmd_type = REQ_TYPE_DRV_PRIV; |
3a2d63f8 PB |
609 | |
610 | /* Check again after getting mutex back. */ | |
fd8383fd JB |
611 | if (!nbd->sock) { |
612 | blk_mq_free_request(sreq); | |
1da177e4 | 613 | return -EINVAL; |
fd8383fd | 614 | } |
3a2d63f8 | 615 | |
9b4a6ba9 | 616 | set_bit(NBD_DISCONNECT_REQUESTED, &nbd->runtime_flags); |
c378f70a | 617 | |
fd8383fd JB |
618 | nbd_send_cmd(nbd, blk_mq_rq_to_pdu(sreq)); |
619 | blk_mq_free_request(sreq); | |
c378f70a | 620 | return 0; |
1a2ad211 | 621 | } |
1da177e4 | 622 | |
23272a67 MP |
623 | case NBD_CLEAR_SOCK: |
624 | sock_shutdown(nbd); | |
f4507164 | 625 | nbd_clear_que(nbd); |
3a2d63f8 | 626 | kill_bdev(bdev); |
1a2ad211 | 627 | return 0; |
1a2ad211 PM |
628 | |
629 | case NBD_SET_SOCK: { | |
e2511578 | 630 | int err; |
23272a67 MP |
631 | struct socket *sock = sockfd_lookup(arg, &err); |
632 | ||
633 | if (!sock) | |
634 | return err; | |
635 | ||
636 | err = nbd_set_socket(nbd, sock); | |
637 | if (!err && max_part) | |
638 | bdev->bd_invalidated = 1; | |
639 | ||
640 | return err; | |
1a2ad211 PM |
641 | } |
642 | ||
37091fdd | 643 | case NBD_SET_BLKSIZE: { |
5e454c67 | 644 | loff_t bsize = div_s64(nbd->bytesize, arg); |
37091fdd MP |
645 | |
646 | return nbd_size_set(nbd, bdev, arg, bsize); | |
647 | } | |
1a2ad211 | 648 | |
1da177e4 | 649 | case NBD_SET_SIZE: |
37091fdd MP |
650 | return nbd_size_set(nbd, bdev, nbd->blksize, |
651 | arg / nbd->blksize); | |
652 | ||
653 | case NBD_SET_SIZE_BLOCKS: | |
654 | return nbd_size_set(nbd, bdev, nbd->blksize, arg); | |
1a2ad211 | 655 | |
7fdfd406 | 656 | case NBD_SET_TIMEOUT: |
0eadf37a | 657 | nbd->tag_set.timeout = arg * HZ; |
7fdfd406 | 658 | return 0; |
1a2ad211 | 659 | |
2f012508 PC |
660 | case NBD_SET_FLAGS: |
661 | nbd->flags = arg; | |
662 | return 0; | |
663 | ||
1a2ad211 | 664 | case NBD_DO_IT: { |
1a2ad211 PM |
665 | int error; |
666 | ||
6521d39a | 667 | if (nbd->task_recv) |
c91192d6 | 668 | return -EBUSY; |
e2511578 | 669 | if (!nbd->sock) |
1da177e4 | 670 | return -EINVAL; |
1a2ad211 | 671 | |
97240963 VN |
672 | /* We have to claim the device under the lock */ |
673 | nbd->task_recv = current; | |
f4507164 | 674 | mutex_unlock(&nbd->tx_lock); |
1a2ad211 | 675 | |
d02cf531 | 676 | nbd_parse_flags(nbd, bdev); |
a336d298 | 677 | |
30d53d9c | 678 | nbd_dev_dbg_init(nbd); |
37091fdd | 679 | error = nbd_thread_recv(nbd, bdev); |
30d53d9c | 680 | nbd_dev_dbg_close(nbd); |
1a2ad211 | 681 | |
f4507164 | 682 | mutex_lock(&nbd->tx_lock); |
97240963 | 683 | nbd->task_recv = NULL; |
19391830 | 684 | |
36e47bee | 685 | sock_shutdown(nbd); |
f4507164 | 686 | nbd_clear_que(nbd); |
3a2d63f8 | 687 | kill_bdev(bdev); |
0e4f0f6f MP |
688 | nbd_bdev_reset(bdev); |
689 | ||
9b4a6ba9 JB |
690 | /* user requested, ignore socket errors */ |
691 | if (test_bit(NBD_DISCONNECT_REQUESTED, &nbd->runtime_flags)) | |
1f7b5cf1 | 692 | error = 0; |
9b4a6ba9 | 693 | if (test_bit(NBD_TIMEDOUT, &nbd->runtime_flags)) |
1f7b5cf1 MP |
694 | error = -ETIMEDOUT; |
695 | ||
0e4f0f6f MP |
696 | nbd_reset(nbd); |
697 | ||
19391830 | 698 | return error; |
1a2ad211 PM |
699 | } |
700 | ||
1da177e4 | 701 | case NBD_CLEAR_QUE: |
4b2f0260 HX |
702 | /* |
703 | * This is for compatibility only. The queue is always cleared | |
704 | * by NBD_DO_IT or NBD_CLEAR_SOCK. | |
705 | */ | |
1da177e4 | 706 | return 0; |
1a2ad211 | 707 | |
1da177e4 | 708 | case NBD_PRINT_DEBUG: |
fd8383fd JB |
709 | /* |
710 | * For compatibility only, we no longer keep a list of | |
711 | * outstanding requests. | |
712 | */ | |
1da177e4 LT |
713 | return 0; |
714 | } | |
1a2ad211 PM |
715 | return -ENOTTY; |
716 | } | |
717 | ||
718 | static int nbd_ioctl(struct block_device *bdev, fmode_t mode, | |
719 | unsigned int cmd, unsigned long arg) | |
720 | { | |
f4507164 | 721 | struct nbd_device *nbd = bdev->bd_disk->private_data; |
1a2ad211 PM |
722 | int error; |
723 | ||
724 | if (!capable(CAP_SYS_ADMIN)) | |
725 | return -EPERM; | |
726 | ||
f4507164 | 727 | BUG_ON(nbd->magic != NBD_MAGIC); |
1a2ad211 | 728 | |
f4507164 WG |
729 | mutex_lock(&nbd->tx_lock); |
730 | error = __nbd_ioctl(bdev, nbd, cmd, arg); | |
731 | mutex_unlock(&nbd->tx_lock); | |
1a2ad211 PM |
732 | |
733 | return error; | |
1da177e4 LT |
734 | } |
735 | ||
83d5cde4 | 736 | static const struct block_device_operations nbd_fops = |
1da177e4 LT |
737 | { |
738 | .owner = THIS_MODULE, | |
8a6cfeb6 | 739 | .ioctl = nbd_ioctl, |
263a3df1 | 740 | .compat_ioctl = nbd_ioctl, |
1da177e4 LT |
741 | }; |
742 | ||
30d53d9c MP |
743 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
744 | ||
745 | static int nbd_dbg_tasks_show(struct seq_file *s, void *unused) | |
746 | { | |
747 | struct nbd_device *nbd = s->private; | |
748 | ||
749 | if (nbd->task_recv) | |
750 | seq_printf(s, "recv: %d\n", task_pid_nr(nbd->task_recv)); | |
751 | if (nbd->task_send) | |
752 | seq_printf(s, "send: %d\n", task_pid_nr(nbd->task_send)); | |
753 | ||
754 | return 0; | |
755 | } | |
756 | ||
757 | static int nbd_dbg_tasks_open(struct inode *inode, struct file *file) | |
758 | { | |
759 | return single_open(file, nbd_dbg_tasks_show, inode->i_private); | |
760 | } | |
761 | ||
762 | static const struct file_operations nbd_dbg_tasks_ops = { | |
763 | .open = nbd_dbg_tasks_open, | |
764 | .read = seq_read, | |
765 | .llseek = seq_lseek, | |
766 | .release = single_release, | |
767 | }; | |
768 | ||
769 | static int nbd_dbg_flags_show(struct seq_file *s, void *unused) | |
770 | { | |
771 | struct nbd_device *nbd = s->private; | |
772 | u32 flags = nbd->flags; | |
773 | ||
774 | seq_printf(s, "Hex: 0x%08x\n\n", flags); | |
775 | ||
776 | seq_puts(s, "Known flags:\n"); | |
777 | ||
778 | if (flags & NBD_FLAG_HAS_FLAGS) | |
779 | seq_puts(s, "NBD_FLAG_HAS_FLAGS\n"); | |
780 | if (flags & NBD_FLAG_READ_ONLY) | |
781 | seq_puts(s, "NBD_FLAG_READ_ONLY\n"); | |
782 | if (flags & NBD_FLAG_SEND_FLUSH) | |
783 | seq_puts(s, "NBD_FLAG_SEND_FLUSH\n"); | |
784 | if (flags & NBD_FLAG_SEND_TRIM) | |
785 | seq_puts(s, "NBD_FLAG_SEND_TRIM\n"); | |
786 | ||
787 | return 0; | |
788 | } | |
789 | ||
790 | static int nbd_dbg_flags_open(struct inode *inode, struct file *file) | |
791 | { | |
792 | return single_open(file, nbd_dbg_flags_show, inode->i_private); | |
793 | } | |
794 | ||
795 | static const struct file_operations nbd_dbg_flags_ops = { | |
796 | .open = nbd_dbg_flags_open, | |
797 | .read = seq_read, | |
798 | .llseek = seq_lseek, | |
799 | .release = single_release, | |
800 | }; | |
801 | ||
802 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
803 | { | |
804 | struct dentry *dir; | |
27ea43fe MP |
805 | |
806 | if (!nbd_dbg_dir) | |
807 | return -EIO; | |
30d53d9c MP |
808 | |
809 | dir = debugfs_create_dir(nbd_name(nbd), nbd_dbg_dir); | |
27ea43fe MP |
810 | if (!dir) { |
811 | dev_err(nbd_to_dev(nbd), "Failed to create debugfs dir for '%s'\n", | |
812 | nbd_name(nbd)); | |
813 | return -EIO; | |
30d53d9c MP |
814 | } |
815 | nbd->dbg_dir = dir; | |
816 | ||
27ea43fe MP |
817 | debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_ops); |
818 | debugfs_create_u64("size_bytes", 0444, dir, &nbd->bytesize); | |
0eadf37a | 819 | debugfs_create_u32("timeout", 0444, dir, &nbd->tag_set.timeout); |
27ea43fe | 820 | debugfs_create_u32("blocksize", 0444, dir, &nbd->blksize); |
d366a0ff | 821 | debugfs_create_file("flags", 0444, dir, nbd, &nbd_dbg_flags_ops); |
30d53d9c MP |
822 | |
823 | return 0; | |
824 | } | |
825 | ||
826 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
827 | { | |
828 | debugfs_remove_recursive(nbd->dbg_dir); | |
829 | } | |
830 | ||
831 | static int nbd_dbg_init(void) | |
832 | { | |
833 | struct dentry *dbg_dir; | |
834 | ||
835 | dbg_dir = debugfs_create_dir("nbd", NULL); | |
27ea43fe MP |
836 | if (!dbg_dir) |
837 | return -EIO; | |
30d53d9c MP |
838 | |
839 | nbd_dbg_dir = dbg_dir; | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | static void nbd_dbg_close(void) | |
845 | { | |
846 | debugfs_remove_recursive(nbd_dbg_dir); | |
847 | } | |
848 | ||
849 | #else /* IS_ENABLED(CONFIG_DEBUG_FS) */ | |
850 | ||
851 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
852 | { | |
853 | return 0; | |
854 | } | |
855 | ||
856 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
857 | { | |
858 | } | |
859 | ||
860 | static int nbd_dbg_init(void) | |
861 | { | |
862 | return 0; | |
863 | } | |
864 | ||
865 | static void nbd_dbg_close(void) | |
866 | { | |
867 | } | |
868 | ||
869 | #endif | |
870 | ||
fd8383fd JB |
871 | static int nbd_init_request(void *data, struct request *rq, |
872 | unsigned int hctx_idx, unsigned int request_idx, | |
873 | unsigned int numa_node) | |
874 | { | |
875 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
876 | ||
877 | cmd->nbd = data; | |
878 | INIT_LIST_HEAD(&cmd->list); | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static struct blk_mq_ops nbd_mq_ops = { | |
883 | .queue_rq = nbd_queue_rq, | |
fd8383fd | 884 | .init_request = nbd_init_request, |
0eadf37a | 885 | .timeout = nbd_xmit_timeout, |
fd8383fd JB |
886 | }; |
887 | ||
1da177e4 LT |
888 | /* |
889 | * And here should be modules and kernel interface | |
890 | * (Just smiley confuses emacs :-) | |
891 | */ | |
892 | ||
893 | static int __init nbd_init(void) | |
894 | { | |
895 | int err = -ENOMEM; | |
896 | int i; | |
d71a6d73 | 897 | int part_shift; |
1da177e4 | 898 | |
5b7b18cc | 899 | BUILD_BUG_ON(sizeof(struct nbd_request) != 28); |
1da177e4 | 900 | |
d71a6d73 | 901 | if (max_part < 0) { |
7742ce4a | 902 | printk(KERN_ERR "nbd: max_part must be >= 0\n"); |
d71a6d73 LV |
903 | return -EINVAL; |
904 | } | |
905 | ||
906 | part_shift = 0; | |
5988ce23 | 907 | if (max_part > 0) { |
d71a6d73 LV |
908 | part_shift = fls(max_part); |
909 | ||
5988ce23 NK |
910 | /* |
911 | * Adjust max_part according to part_shift as it is exported | |
912 | * to user space so that user can know the max number of | |
913 | * partition kernel should be able to manage. | |
914 | * | |
915 | * Note that -1 is required because partition 0 is reserved | |
916 | * for the whole disk. | |
917 | */ | |
918 | max_part = (1UL << part_shift) - 1; | |
919 | } | |
920 | ||
3b271082 NK |
921 | if ((1UL << part_shift) > DISK_MAX_PARTS) |
922 | return -EINVAL; | |
923 | ||
924 | if (nbds_max > 1UL << (MINORBITS - part_shift)) | |
925 | return -EINVAL; | |
926 | ||
ff6b8090 SM |
927 | nbd_dev = kcalloc(nbds_max, sizeof(*nbd_dev), GFP_KERNEL); |
928 | if (!nbd_dev) | |
929 | return -ENOMEM; | |
930 | ||
40be0c28 | 931 | for (i = 0; i < nbds_max; i++) { |
d71a6d73 | 932 | struct gendisk *disk = alloc_disk(1 << part_shift); |
1da177e4 LT |
933 | if (!disk) |
934 | goto out; | |
935 | nbd_dev[i].disk = disk; | |
fd8383fd JB |
936 | |
937 | nbd_dev[i].tag_set.ops = &nbd_mq_ops; | |
938 | nbd_dev[i].tag_set.nr_hw_queues = 1; | |
939 | nbd_dev[i].tag_set.queue_depth = 128; | |
940 | nbd_dev[i].tag_set.numa_node = NUMA_NO_NODE; | |
941 | nbd_dev[i].tag_set.cmd_size = sizeof(struct nbd_cmd); | |
942 | nbd_dev[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE | | |
005043ac | 943 | BLK_MQ_F_SG_MERGE | BLK_MQ_F_BLOCKING; |
fd8383fd JB |
944 | nbd_dev[i].tag_set.driver_data = &nbd_dev[i]; |
945 | ||
946 | err = blk_mq_alloc_tag_set(&nbd_dev[i].tag_set); | |
947 | if (err) { | |
948 | put_disk(disk); | |
949 | goto out; | |
950 | } | |
951 | ||
1da177e4 LT |
952 | /* |
953 | * The new linux 2.5 block layer implementation requires | |
954 | * every gendisk to have its very own request_queue struct. | |
955 | * These structs are big so we dynamically allocate them. | |
956 | */ | |
fd8383fd | 957 | disk->queue = blk_mq_init_queue(&nbd_dev[i].tag_set); |
1da177e4 | 958 | if (!disk->queue) { |
fd8383fd | 959 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
1da177e4 LT |
960 | put_disk(disk); |
961 | goto out; | |
962 | } | |
fd8383fd | 963 | |
31dcfab0 JA |
964 | /* |
965 | * Tell the block layer that we are not a rotational device | |
966 | */ | |
967 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, disk->queue); | |
b277da0a | 968 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, disk->queue); |
a336d298 | 969 | disk->queue->limits.discard_granularity = 512; |
2bb4cd5c | 970 | blk_queue_max_discard_sectors(disk->queue, UINT_MAX); |
a336d298 | 971 | disk->queue->limits.discard_zeroes_data = 0; |
078be02b MB |
972 | blk_queue_max_hw_sectors(disk->queue, 65536); |
973 | disk->queue->limits.max_sectors = 256; | |
1da177e4 LT |
974 | } |
975 | ||
976 | if (register_blkdev(NBD_MAJOR, "nbd")) { | |
977 | err = -EIO; | |
978 | goto out; | |
979 | } | |
980 | ||
981 | printk(KERN_INFO "nbd: registered device at major %d\n", NBD_MAJOR); | |
1da177e4 | 982 | |
30d53d9c MP |
983 | nbd_dbg_init(); |
984 | ||
40be0c28 | 985 | for (i = 0; i < nbds_max; i++) { |
1da177e4 | 986 | struct gendisk *disk = nbd_dev[i].disk; |
f4507164 | 987 | nbd_dev[i].magic = NBD_MAGIC; |
23272a67 | 988 | spin_lock_init(&nbd_dev[i].sock_lock); |
82d4dc5a | 989 | mutex_init(&nbd_dev[i].tx_lock); |
1da177e4 | 990 | disk->major = NBD_MAJOR; |
d71a6d73 | 991 | disk->first_minor = i << part_shift; |
1da177e4 LT |
992 | disk->fops = &nbd_fops; |
993 | disk->private_data = &nbd_dev[i]; | |
1da177e4 | 994 | sprintf(disk->disk_name, "nbd%d", i); |
0e4f0f6f | 995 | nbd_reset(&nbd_dev[i]); |
1da177e4 LT |
996 | add_disk(disk); |
997 | } | |
998 | ||
999 | return 0; | |
1000 | out: | |
1001 | while (i--) { | |
fd8383fd | 1002 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
1da177e4 LT |
1003 | blk_cleanup_queue(nbd_dev[i].disk->queue); |
1004 | put_disk(nbd_dev[i].disk); | |
1005 | } | |
f3944d61 | 1006 | kfree(nbd_dev); |
1da177e4 LT |
1007 | return err; |
1008 | } | |
1009 | ||
1010 | static void __exit nbd_cleanup(void) | |
1011 | { | |
1012 | int i; | |
30d53d9c MP |
1013 | |
1014 | nbd_dbg_close(); | |
1015 | ||
40be0c28 | 1016 | for (i = 0; i < nbds_max; i++) { |
1da177e4 | 1017 | struct gendisk *disk = nbd_dev[i].disk; |
40be0c28 | 1018 | nbd_dev[i].magic = 0; |
1da177e4 LT |
1019 | if (disk) { |
1020 | del_gendisk(disk); | |
1021 | blk_cleanup_queue(disk->queue); | |
fd8383fd | 1022 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
1da177e4 LT |
1023 | put_disk(disk); |
1024 | } | |
1025 | } | |
1da177e4 | 1026 | unregister_blkdev(NBD_MAJOR, "nbd"); |
f3944d61 | 1027 | kfree(nbd_dev); |
1da177e4 LT |
1028 | printk(KERN_INFO "nbd: unregistered device at major %d\n", NBD_MAJOR); |
1029 | } | |
1030 | ||
1031 | module_init(nbd_init); | |
1032 | module_exit(nbd_cleanup); | |
1033 | ||
1034 | MODULE_DESCRIPTION("Network Block Device"); | |
1035 | MODULE_LICENSE("GPL"); | |
1036 | ||
40be0c28 | 1037 | module_param(nbds_max, int, 0444); |
d71a6d73 LV |
1038 | MODULE_PARM_DESC(nbds_max, "number of network block devices to initialize (default: 16)"); |
1039 | module_param(max_part, int, 0444); | |
1040 | MODULE_PARM_DESC(max_part, "number of partitions per device (default: 0)"); |