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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 | ||
13e71d69 | 44 | struct nbd_device { |
22d109c1 | 45 | u32 flags; |
13e71d69 MP |
46 | struct socket * sock; /* If == NULL, device is not ready, yet */ |
47 | int magic; | |
48 | ||
fd8383fd JB |
49 | atomic_t outstanding_cmds; |
50 | struct blk_mq_tag_set tag_set; | |
13e71d69 MP |
51 | |
52 | struct mutex tx_lock; | |
53 | struct gendisk *disk; | |
54 | int blksize; | |
b9c495bb | 55 | loff_t bytesize; |
13e71d69 | 56 | int xmit_timeout; |
1f7b5cf1 | 57 | bool timedout; |
696697cb | 58 | bool disconnect; /* a disconnect has been requested by user */ |
7e2893a1 MP |
59 | |
60 | struct timer_list timeout_timer; | |
23272a67 MP |
61 | /* protects initialization and shutdown of the socket */ |
62 | spinlock_t sock_lock; | |
7e2893a1 MP |
63 | struct task_struct *task_recv; |
64 | struct task_struct *task_send; | |
30d53d9c MP |
65 | |
66 | #if IS_ENABLED(CONFIG_DEBUG_FS) | |
67 | struct dentry *dbg_dir; | |
68 | #endif | |
13e71d69 MP |
69 | }; |
70 | ||
fd8383fd JB |
71 | struct nbd_cmd { |
72 | struct nbd_device *nbd; | |
73 | struct list_head list; | |
74 | }; | |
75 | ||
30d53d9c MP |
76 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
77 | static struct dentry *nbd_dbg_dir; | |
78 | #endif | |
79 | ||
80 | #define nbd_name(nbd) ((nbd)->disk->disk_name) | |
81 | ||
f4507164 | 82 | #define NBD_MAGIC 0x68797548 |
1da177e4 | 83 | |
9c7a4169 | 84 | static unsigned int nbds_max = 16; |
20a8143e | 85 | static struct nbd_device *nbd_dev; |
d71a6d73 | 86 | static int max_part; |
1da177e4 | 87 | |
d18509f5 | 88 | static inline struct device *nbd_to_dev(struct nbd_device *nbd) |
1da177e4 | 89 | { |
d18509f5 | 90 | return disk_to_dev(nbd->disk); |
1da177e4 LT |
91 | } |
92 | ||
37091fdd MP |
93 | static bool nbd_is_connected(struct nbd_device *nbd) |
94 | { | |
95 | return !!nbd->task_recv; | |
96 | } | |
97 | ||
1da177e4 LT |
98 | static const char *nbdcmd_to_ascii(int cmd) |
99 | { | |
100 | switch (cmd) { | |
101 | case NBD_CMD_READ: return "read"; | |
102 | case NBD_CMD_WRITE: return "write"; | |
103 | case NBD_CMD_DISC: return "disconnect"; | |
75f187ab | 104 | case NBD_CMD_FLUSH: return "flush"; |
a336d298 | 105 | case NBD_CMD_TRIM: return "trim/discard"; |
1da177e4 LT |
106 | } |
107 | return "invalid"; | |
108 | } | |
1da177e4 | 109 | |
37091fdd MP |
110 | static int nbd_size_clear(struct nbd_device *nbd, struct block_device *bdev) |
111 | { | |
112 | bdev->bd_inode->i_size = 0; | |
113 | set_capacity(nbd->disk, 0); | |
114 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | static void nbd_size_update(struct nbd_device *nbd, struct block_device *bdev) | |
120 | { | |
121 | if (!nbd_is_connected(nbd)) | |
122 | return; | |
123 | ||
124 | bdev->bd_inode->i_size = nbd->bytesize; | |
125 | set_capacity(nbd->disk, nbd->bytesize >> 9); | |
126 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); | |
127 | } | |
128 | ||
129 | static int nbd_size_set(struct nbd_device *nbd, struct block_device *bdev, | |
130 | int blocksize, int nr_blocks) | |
131 | { | |
132 | int ret; | |
133 | ||
134 | ret = set_blocksize(bdev, blocksize); | |
135 | if (ret) | |
136 | return ret; | |
137 | ||
138 | nbd->blksize = blocksize; | |
139 | nbd->bytesize = (loff_t)blocksize * (loff_t)nr_blocks; | |
140 | ||
141 | nbd_size_update(nbd, bdev); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
fd8383fd | 146 | static void nbd_end_request(struct nbd_cmd *cmd) |
1da177e4 | 147 | { |
fd8383fd JB |
148 | struct nbd_device *nbd = cmd->nbd; |
149 | struct request *req = blk_mq_rq_from_pdu(cmd); | |
097c94a4 | 150 | int error = req->errors ? -EIO : 0; |
1da177e4 | 151 | |
fd8383fd | 152 | dev_dbg(nbd_to_dev(nbd), "request %p: %s\n", cmd, |
d18509f5 | 153 | error ? "failed" : "done"); |
1da177e4 | 154 | |
fd8383fd JB |
155 | atomic_dec(&nbd->outstanding_cmds); |
156 | blk_mq_complete_request(req, error); | |
1da177e4 LT |
157 | } |
158 | ||
e018e757 MP |
159 | /* |
160 | * Forcibly shutdown the socket causing all listeners to error | |
161 | */ | |
36e47bee | 162 | static void sock_shutdown(struct nbd_device *nbd) |
7fdfd406 | 163 | { |
23272a67 MP |
164 | spin_lock_irq(&nbd->sock_lock); |
165 | ||
166 | if (!nbd->sock) { | |
167 | spin_unlock_irq(&nbd->sock_lock); | |
260bbce4 | 168 | return; |
23272a67 | 169 | } |
260bbce4 MP |
170 | |
171 | dev_warn(disk_to_dev(nbd->disk), "shutting down socket\n"); | |
172 | kernel_sock_shutdown(nbd->sock, SHUT_RDWR); | |
23272a67 | 173 | sockfd_put(nbd->sock); |
260bbce4 | 174 | nbd->sock = NULL; |
23272a67 MP |
175 | spin_unlock_irq(&nbd->sock_lock); |
176 | ||
177 | del_timer(&nbd->timeout_timer); | |
7fdfd406 PC |
178 | } |
179 | ||
180 | static void nbd_xmit_timeout(unsigned long arg) | |
181 | { | |
7e2893a1 | 182 | struct nbd_device *nbd = (struct nbd_device *)arg; |
dcc909d9 | 183 | unsigned long flags; |
7e2893a1 | 184 | |
fd8383fd | 185 | if (!atomic_read(&nbd->outstanding_cmds)) |
7e2893a1 MP |
186 | return; |
187 | ||
23272a67 | 188 | spin_lock_irqsave(&nbd->sock_lock, flags); |
dcc909d9 | 189 | |
1f7b5cf1 | 190 | nbd->timedout = true; |
7fdfd406 | 191 | |
23272a67 MP |
192 | if (nbd->sock) |
193 | kernel_sock_shutdown(nbd->sock, SHUT_RDWR); | |
7e2893a1 | 194 | |
23272a67 | 195 | spin_unlock_irqrestore(&nbd->sock_lock, flags); |
dcc909d9 | 196 | |
23272a67 | 197 | dev_err(nbd_to_dev(nbd), "Connection timed out, shutting down connection\n"); |
7fdfd406 PC |
198 | } |
199 | ||
1da177e4 LT |
200 | /* |
201 | * Send or receive packet. | |
202 | */ | |
f4507164 | 203 | static int sock_xmit(struct nbd_device *nbd, int send, void *buf, int size, |
1da177e4 LT |
204 | int msg_flags) |
205 | { | |
f4507164 | 206 | struct socket *sock = nbd->sock; |
1da177e4 LT |
207 | int result; |
208 | struct msghdr msg; | |
209 | struct kvec iov; | |
7f338fe4 | 210 | unsigned long pflags = current->flags; |
1da177e4 | 211 | |
ffc41cf8 | 212 | if (unlikely(!sock)) { |
f4507164 | 213 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
214 | "Attempted %s on closed socket in sock_xmit\n", |
215 | (send ? "send" : "recv")); | |
ffc41cf8 MS |
216 | return -EINVAL; |
217 | } | |
218 | ||
7f338fe4 | 219 | current->flags |= PF_MEMALLOC; |
1da177e4 | 220 | do { |
7f338fe4 | 221 | sock->sk->sk_allocation = GFP_NOIO | __GFP_MEMALLOC; |
1da177e4 LT |
222 | iov.iov_base = buf; |
223 | iov.iov_len = size; | |
224 | msg.msg_name = NULL; | |
225 | msg.msg_namelen = 0; | |
226 | msg.msg_control = NULL; | |
227 | msg.msg_controllen = 0; | |
1da177e4 LT |
228 | msg.msg_flags = msg_flags | MSG_NOSIGNAL; |
229 | ||
7e2893a1 | 230 | if (send) |
1da177e4 | 231 | result = kernel_sendmsg(sock, &msg, &iov, 1, size); |
7e2893a1 | 232 | else |
35fbf5bc NK |
233 | result = kernel_recvmsg(sock, &msg, &iov, 1, size, |
234 | msg.msg_flags); | |
1da177e4 | 235 | |
1da177e4 LT |
236 | if (result <= 0) { |
237 | if (result == 0) | |
238 | result = -EPIPE; /* short read */ | |
239 | break; | |
240 | } | |
241 | size -= result; | |
242 | buf += result; | |
243 | } while (size > 0); | |
244 | ||
7f338fe4 | 245 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
1da177e4 | 246 | |
7e2893a1 MP |
247 | if (!send && nbd->xmit_timeout) |
248 | mod_timer(&nbd->timeout_timer, jiffies + nbd->xmit_timeout); | |
249 | ||
1da177e4 LT |
250 | return result; |
251 | } | |
252 | ||
f4507164 | 253 | static inline int sock_send_bvec(struct nbd_device *nbd, struct bio_vec *bvec, |
1da177e4 LT |
254 | int flags) |
255 | { | |
256 | int result; | |
257 | void *kaddr = kmap(bvec->bv_page); | |
f4507164 WG |
258 | result = sock_xmit(nbd, 1, kaddr + bvec->bv_offset, |
259 | bvec->bv_len, flags); | |
1da177e4 LT |
260 | kunmap(bvec->bv_page); |
261 | return result; | |
262 | } | |
263 | ||
7fdfd406 | 264 | /* always call with the tx_lock held */ |
fd8383fd | 265 | static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd) |
1da177e4 | 266 | { |
fd8383fd | 267 | struct request *req = blk_mq_rq_from_pdu(cmd); |
5705f702 | 268 | int result, flags; |
1da177e4 | 269 | struct nbd_request request; |
1011c1b9 | 270 | unsigned long size = blk_rq_bytes(req); |
9dc6c806 CH |
271 | u32 type; |
272 | ||
273 | if (req->cmd_type == REQ_TYPE_DRV_PRIV) | |
274 | type = NBD_CMD_DISC; | |
c2df40df | 275 | else if (req_op(req) == REQ_OP_DISCARD) |
9dc6c806 | 276 | type = NBD_CMD_TRIM; |
3a5e02ce | 277 | else if (req_op(req) == REQ_OP_FLUSH) |
9dc6c806 CH |
278 | type = NBD_CMD_FLUSH; |
279 | else if (rq_data_dir(req) == WRITE) | |
280 | type = NBD_CMD_WRITE; | |
281 | else | |
282 | type = NBD_CMD_READ; | |
1da177e4 | 283 | |
04cfac4e | 284 | memset(&request, 0, sizeof(request)); |
1da177e4 | 285 | request.magic = htonl(NBD_REQUEST_MAGIC); |
9dc6c806 CH |
286 | request.type = htonl(type); |
287 | if (type != NBD_CMD_FLUSH && type != NBD_CMD_DISC) { | |
75f187ab AB |
288 | request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9); |
289 | request.len = htonl(size); | |
290 | } | |
fd8383fd | 291 | memcpy(request.handle, &req->tag, sizeof(req->tag)); |
1da177e4 | 292 | |
d18509f5 | 293 | dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n", |
fd8383fd | 294 | cmd, nbdcmd_to_ascii(type), |
d18509f5 | 295 | (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req)); |
f4507164 | 296 | result = sock_xmit(nbd, 1, &request, sizeof(request), |
9dc6c806 | 297 | (type == NBD_CMD_WRITE) ? MSG_MORE : 0); |
1da177e4 | 298 | if (result <= 0) { |
f4507164 | 299 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 | 300 | "Send control failed (result %d)\n", result); |
dab5313a | 301 | return -EIO; |
1da177e4 LT |
302 | } |
303 | ||
9dc6c806 | 304 | if (type == NBD_CMD_WRITE) { |
5705f702 | 305 | struct req_iterator iter; |
7988613b | 306 | struct bio_vec bvec; |
1da177e4 LT |
307 | /* |
308 | * we are really probing at internals to determine | |
309 | * whether to set MSG_MORE or not... | |
310 | */ | |
5705f702 | 311 | rq_for_each_segment(bvec, req, iter) { |
6c92e699 | 312 | flags = 0; |
4550dd6c | 313 | if (!rq_iter_last(bvec, iter)) |
6c92e699 | 314 | flags = MSG_MORE; |
d18509f5 | 315 | dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n", |
fd8383fd | 316 | cmd, bvec.bv_len); |
7988613b | 317 | result = sock_send_bvec(nbd, &bvec, flags); |
6c92e699 | 318 | if (result <= 0) { |
f4507164 | 319 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
320 | "Send data failed (result %d)\n", |
321 | result); | |
dab5313a | 322 | return -EIO; |
6c92e699 | 323 | } |
1da177e4 LT |
324 | } |
325 | } | |
1da177e4 | 326 | return 0; |
1da177e4 LT |
327 | } |
328 | ||
f4507164 | 329 | static inline int sock_recv_bvec(struct nbd_device *nbd, struct bio_vec *bvec) |
1da177e4 LT |
330 | { |
331 | int result; | |
332 | void *kaddr = kmap(bvec->bv_page); | |
f4507164 | 333 | result = sock_xmit(nbd, 0, kaddr + bvec->bv_offset, bvec->bv_len, |
1da177e4 LT |
334 | MSG_WAITALL); |
335 | kunmap(bvec->bv_page); | |
336 | return result; | |
337 | } | |
338 | ||
339 | /* NULL returned = something went wrong, inform userspace */ | |
fd8383fd | 340 | static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd) |
1da177e4 LT |
341 | { |
342 | int result; | |
343 | struct nbd_reply reply; | |
fd8383fd JB |
344 | struct nbd_cmd *cmd; |
345 | struct request *req = NULL; | |
346 | u16 hwq; | |
347 | int tag; | |
1da177e4 LT |
348 | |
349 | reply.magic = 0; | |
f4507164 | 350 | result = sock_xmit(nbd, 0, &reply, sizeof(reply), MSG_WAITALL); |
1da177e4 | 351 | if (result <= 0) { |
f4507164 | 352 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 | 353 | "Receive control failed (result %d)\n", result); |
19391830 | 354 | return ERR_PTR(result); |
1da177e4 | 355 | } |
e4b57e08 MF |
356 | |
357 | if (ntohl(reply.magic) != NBD_REPLY_MAGIC) { | |
f4507164 | 358 | dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n", |
e4b57e08 | 359 | (unsigned long)ntohl(reply.magic)); |
19391830 | 360 | return ERR_PTR(-EPROTO); |
e4b57e08 MF |
361 | } |
362 | ||
fd8383fd | 363 | memcpy(&tag, reply.handle, sizeof(int)); |
4b2f0260 | 364 | |
fd8383fd JB |
365 | hwq = blk_mq_unique_tag_to_hwq(tag); |
366 | if (hwq < nbd->tag_set.nr_hw_queues) | |
367 | req = blk_mq_tag_to_rq(nbd->tag_set.tags[hwq], | |
368 | blk_mq_unique_tag_to_tag(tag)); | |
369 | if (!req || !blk_mq_request_started(req)) { | |
370 | dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%d) %p\n", | |
371 | tag, req); | |
372 | return ERR_PTR(-ENOENT); | |
1da177e4 | 373 | } |
fd8383fd | 374 | cmd = blk_mq_rq_to_pdu(req); |
1da177e4 | 375 | |
1da177e4 | 376 | if (ntohl(reply.error)) { |
f4507164 | 377 | dev_err(disk_to_dev(nbd->disk), "Other side returned error (%d)\n", |
7f1b90f9 | 378 | ntohl(reply.error)); |
1da177e4 | 379 | req->errors++; |
fd8383fd | 380 | return cmd; |
1da177e4 LT |
381 | } |
382 | ||
fd8383fd | 383 | dev_dbg(nbd_to_dev(nbd), "request %p: got reply\n", cmd); |
9dc6c806 | 384 | if (rq_data_dir(req) != WRITE) { |
5705f702 | 385 | struct req_iterator iter; |
7988613b | 386 | struct bio_vec bvec; |
5705f702 N |
387 | |
388 | rq_for_each_segment(bvec, req, iter) { | |
7988613b | 389 | result = sock_recv_bvec(nbd, &bvec); |
6c92e699 | 390 | if (result <= 0) { |
f4507164 | 391 | dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n", |
7f1b90f9 | 392 | result); |
6c92e699 | 393 | req->errors++; |
fd8383fd | 394 | return cmd; |
6c92e699 | 395 | } |
d18509f5 | 396 | dev_dbg(nbd_to_dev(nbd), "request %p: got %d bytes data\n", |
fd8383fd | 397 | cmd, bvec.bv_len); |
1da177e4 LT |
398 | } |
399 | } | |
fd8383fd | 400 | return cmd; |
1da177e4 LT |
401 | } |
402 | ||
edfaa7c3 KS |
403 | static ssize_t pid_show(struct device *dev, |
404 | struct device_attribute *attr, char *buf) | |
6b39bb65 | 405 | { |
edfaa7c3 | 406 | struct gendisk *disk = dev_to_disk(dev); |
6521d39a | 407 | struct nbd_device *nbd = (struct nbd_device *)disk->private_data; |
edfaa7c3 | 408 | |
6521d39a | 409 | return sprintf(buf, "%d\n", task_pid_nr(nbd->task_recv)); |
6b39bb65 PC |
410 | } |
411 | ||
edfaa7c3 | 412 | static struct device_attribute pid_attr = { |
01e8ef11 | 413 | .attr = { .name = "pid", .mode = S_IRUGO}, |
6b39bb65 PC |
414 | .show = pid_show, |
415 | }; | |
416 | ||
37091fdd | 417 | static int nbd_thread_recv(struct nbd_device *nbd, struct block_device *bdev) |
1da177e4 | 418 | { |
fd8383fd | 419 | struct nbd_cmd *cmd; |
84963048 | 420 | int ret; |
1da177e4 | 421 | |
f4507164 | 422 | BUG_ON(nbd->magic != NBD_MAGIC); |
1da177e4 | 423 | |
7f338fe4 | 424 | sk_set_memalloc(nbd->sock->sk); |
6521d39a | 425 | |
f4507164 | 426 | ret = device_create_file(disk_to_dev(nbd->disk), &pid_attr); |
84963048 | 427 | if (ret) { |
f4507164 | 428 | dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n"); |
84963048 WC |
429 | return ret; |
430 | } | |
6b39bb65 | 431 | |
37091fdd MP |
432 | nbd_size_update(nbd, bdev); |
433 | ||
19391830 | 434 | while (1) { |
fd8383fd JB |
435 | cmd = nbd_read_stat(nbd); |
436 | if (IS_ERR(cmd)) { | |
437 | ret = PTR_ERR(cmd); | |
19391830 MP |
438 | break; |
439 | } | |
440 | ||
fd8383fd | 441 | nbd_end_request(cmd); |
19391830 | 442 | } |
6b39bb65 | 443 | |
37091fdd MP |
444 | nbd_size_clear(nbd, bdev); |
445 | ||
6521d39a | 446 | device_remove_file(disk_to_dev(nbd->disk), &pid_attr); |
7e2893a1 | 447 | return ret; |
1da177e4 LT |
448 | } |
449 | ||
fd8383fd | 450 | static void nbd_clear_req(struct request *req, void *data, bool reserved) |
1da177e4 | 451 | { |
fd8383fd | 452 | struct nbd_cmd *cmd; |
1da177e4 | 453 | |
fd8383fd JB |
454 | if (!blk_mq_request_started(req)) |
455 | return; | |
456 | cmd = blk_mq_rq_to_pdu(req); | |
457 | req->errors++; | |
458 | nbd_end_request(cmd); | |
459 | } | |
460 | ||
461 | static void nbd_clear_que(struct nbd_device *nbd) | |
462 | { | |
f4507164 | 463 | BUG_ON(nbd->magic != NBD_MAGIC); |
1da177e4 | 464 | |
4b2f0260 | 465 | /* |
f4507164 | 466 | * Because we have set nbd->sock to NULL under the tx_lock, all |
fd8383fd | 467 | * modifications to the list must have completed by now. |
4b2f0260 | 468 | */ |
f4507164 | 469 | BUG_ON(nbd->sock); |
4b2f0260 | 470 | |
fd8383fd | 471 | blk_mq_tagset_busy_iter(&nbd->tag_set, nbd_clear_req, NULL); |
e78273c8 | 472 | dev_dbg(disk_to_dev(nbd->disk), "queue cleared\n"); |
1da177e4 LT |
473 | } |
474 | ||
7fdfd406 | 475 | |
fd8383fd | 476 | static void nbd_handle_cmd(struct nbd_cmd *cmd) |
48cf6061 | 477 | { |
fd8383fd JB |
478 | struct request *req = blk_mq_rq_from_pdu(cmd); |
479 | struct nbd_device *nbd = cmd->nbd; | |
480 | ||
33659ebb | 481 | if (req->cmd_type != REQ_TYPE_FS) |
48cf6061 LV |
482 | goto error_out; |
483 | ||
9dc6c806 CH |
484 | if (rq_data_dir(req) == WRITE && |
485 | (nbd->flags & NBD_FLAG_READ_ONLY)) { | |
486 | dev_err(disk_to_dev(nbd->disk), | |
487 | "Write on read-only\n"); | |
488 | goto error_out; | |
75f187ab AB |
489 | } |
490 | ||
48cf6061 LV |
491 | req->errors = 0; |
492 | ||
f4507164 | 493 | mutex_lock(&nbd->tx_lock); |
fd8383fd | 494 | nbd->task_send = current; |
f4507164 WG |
495 | if (unlikely(!nbd->sock)) { |
496 | mutex_unlock(&nbd->tx_lock); | |
497 | dev_err(disk_to_dev(nbd->disk), | |
7f1b90f9 | 498 | "Attempted send on closed socket\n"); |
15746fca | 499 | goto error_out; |
48cf6061 LV |
500 | } |
501 | ||
fd8383fd | 502 | if (nbd->xmit_timeout && !atomic_read(&nbd->outstanding_cmds)) |
7e2893a1 MP |
503 | mod_timer(&nbd->timeout_timer, jiffies + nbd->xmit_timeout); |
504 | ||
fd8383fd JB |
505 | atomic_inc(&nbd->outstanding_cmds); |
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 | { | |
554 | nbd->disconnect = false; | |
555 | nbd->timedout = false; | |
556 | nbd->blksize = 1024; | |
557 | nbd->bytesize = 0; | |
558 | set_capacity(nbd->disk, 0); | |
559 | nbd->flags = 0; | |
560 | nbd->xmit_timeout = 0; | |
561 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); | |
562 | del_timer_sync(&nbd->timeout_timer); | |
563 | } | |
564 | ||
565 | static void nbd_bdev_reset(struct block_device *bdev) | |
566 | { | |
567 | set_device_ro(bdev, false); | |
568 | bdev->bd_inode->i_size = 0; | |
569 | if (max_part > 0) { | |
570 | blkdev_reread_part(bdev); | |
571 | bdev->bd_invalidated = 1; | |
572 | } | |
573 | } | |
574 | ||
d02cf531 MP |
575 | static void nbd_parse_flags(struct nbd_device *nbd, struct block_device *bdev) |
576 | { | |
577 | if (nbd->flags & NBD_FLAG_READ_ONLY) | |
578 | set_device_ro(bdev, true); | |
579 | if (nbd->flags & NBD_FLAG_SEND_TRIM) | |
580 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); | |
581 | if (nbd->flags & NBD_FLAG_SEND_FLUSH) | |
aafb1eec | 582 | blk_queue_write_cache(nbd->disk->queue, true, false); |
d02cf531 | 583 | else |
aafb1eec | 584 | blk_queue_write_cache(nbd->disk->queue, false, false); |
d02cf531 MP |
585 | } |
586 | ||
30d53d9c MP |
587 | static int nbd_dev_dbg_init(struct nbd_device *nbd); |
588 | static void nbd_dev_dbg_close(struct nbd_device *nbd); | |
589 | ||
1a2ad211 | 590 | /* Must be called with tx_lock held */ |
1da177e4 | 591 | |
f4507164 | 592 | static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, |
1a2ad211 PM |
593 | unsigned int cmd, unsigned long arg) |
594 | { | |
1da177e4 | 595 | switch (cmd) { |
1a2ad211 | 596 | case NBD_DISCONNECT: { |
fd8383fd | 597 | struct request *sreq; |
1a2ad211 | 598 | |
f4507164 | 599 | dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n"); |
3a2d63f8 PB |
600 | if (!nbd->sock) |
601 | return -EINVAL; | |
1a2ad211 | 602 | |
fd8383fd JB |
603 | sreq = blk_mq_alloc_request(bdev_get_queue(bdev), WRITE, 0); |
604 | if (!sreq) | |
605 | return -ENOMEM; | |
606 | ||
3a2d63f8 PB |
607 | mutex_unlock(&nbd->tx_lock); |
608 | fsync_bdev(bdev); | |
609 | mutex_lock(&nbd->tx_lock); | |
fd8383fd | 610 | sreq->cmd_type = REQ_TYPE_DRV_PRIV; |
3a2d63f8 PB |
611 | |
612 | /* Check again after getting mutex back. */ | |
fd8383fd JB |
613 | if (!nbd->sock) { |
614 | blk_mq_free_request(sreq); | |
1da177e4 | 615 | return -EINVAL; |
fd8383fd | 616 | } |
3a2d63f8 | 617 | |
696697cb | 618 | nbd->disconnect = true; |
c378f70a | 619 | |
fd8383fd JB |
620 | nbd_send_cmd(nbd, blk_mq_rq_to_pdu(sreq)); |
621 | blk_mq_free_request(sreq); | |
c378f70a | 622 | return 0; |
1a2ad211 | 623 | } |
1da177e4 | 624 | |
23272a67 MP |
625 | case NBD_CLEAR_SOCK: |
626 | sock_shutdown(nbd); | |
f4507164 | 627 | nbd_clear_que(nbd); |
3a2d63f8 | 628 | kill_bdev(bdev); |
1a2ad211 | 629 | return 0; |
1a2ad211 PM |
630 | |
631 | case NBD_SET_SOCK: { | |
e2511578 | 632 | int err; |
23272a67 MP |
633 | struct socket *sock = sockfd_lookup(arg, &err); |
634 | ||
635 | if (!sock) | |
636 | return err; | |
637 | ||
638 | err = nbd_set_socket(nbd, sock); | |
639 | if (!err && max_part) | |
640 | bdev->bd_invalidated = 1; | |
641 | ||
642 | return err; | |
1a2ad211 PM |
643 | } |
644 | ||
37091fdd | 645 | case NBD_SET_BLKSIZE: { |
5e454c67 | 646 | loff_t bsize = div_s64(nbd->bytesize, arg); |
37091fdd MP |
647 | |
648 | return nbd_size_set(nbd, bdev, arg, bsize); | |
649 | } | |
1a2ad211 | 650 | |
1da177e4 | 651 | case NBD_SET_SIZE: |
37091fdd MP |
652 | return nbd_size_set(nbd, bdev, nbd->blksize, |
653 | arg / nbd->blksize); | |
654 | ||
655 | case NBD_SET_SIZE_BLOCKS: | |
656 | return nbd_size_set(nbd, bdev, nbd->blksize, arg); | |
1a2ad211 | 657 | |
7fdfd406 | 658 | case NBD_SET_TIMEOUT: |
f4507164 | 659 | nbd->xmit_timeout = arg * HZ; |
7e2893a1 MP |
660 | if (arg) |
661 | mod_timer(&nbd->timeout_timer, | |
662 | jiffies + nbd->xmit_timeout); | |
663 | else | |
664 | del_timer_sync(&nbd->timeout_timer); | |
665 | ||
7fdfd406 | 666 | return 0; |
1a2ad211 | 667 | |
2f012508 PC |
668 | case NBD_SET_FLAGS: |
669 | nbd->flags = arg; | |
670 | return 0; | |
671 | ||
1a2ad211 | 672 | case NBD_DO_IT: { |
1a2ad211 PM |
673 | int error; |
674 | ||
6521d39a | 675 | if (nbd->task_recv) |
c91192d6 | 676 | return -EBUSY; |
e2511578 | 677 | if (!nbd->sock) |
1da177e4 | 678 | return -EINVAL; |
1a2ad211 | 679 | |
97240963 VN |
680 | /* We have to claim the device under the lock */ |
681 | nbd->task_recv = current; | |
f4507164 | 682 | mutex_unlock(&nbd->tx_lock); |
1a2ad211 | 683 | |
d02cf531 | 684 | nbd_parse_flags(nbd, bdev); |
a336d298 | 685 | |
30d53d9c | 686 | nbd_dev_dbg_init(nbd); |
37091fdd | 687 | error = nbd_thread_recv(nbd, bdev); |
30d53d9c | 688 | nbd_dev_dbg_close(nbd); |
1a2ad211 | 689 | |
f4507164 | 690 | mutex_lock(&nbd->tx_lock); |
97240963 | 691 | nbd->task_recv = NULL; |
19391830 | 692 | |
36e47bee | 693 | sock_shutdown(nbd); |
f4507164 | 694 | nbd_clear_que(nbd); |
3a2d63f8 | 695 | kill_bdev(bdev); |
0e4f0f6f MP |
696 | nbd_bdev_reset(bdev); |
697 | ||
c378f70a | 698 | if (nbd->disconnect) /* user requested, ignore socket errors */ |
1f7b5cf1 MP |
699 | error = 0; |
700 | if (nbd->timedout) | |
701 | error = -ETIMEDOUT; | |
702 | ||
0e4f0f6f MP |
703 | nbd_reset(nbd); |
704 | ||
19391830 | 705 | return error; |
1a2ad211 PM |
706 | } |
707 | ||
1da177e4 | 708 | case NBD_CLEAR_QUE: |
4b2f0260 HX |
709 | /* |
710 | * This is for compatibility only. The queue is always cleared | |
711 | * by NBD_DO_IT or NBD_CLEAR_SOCK. | |
712 | */ | |
1da177e4 | 713 | return 0; |
1a2ad211 | 714 | |
1da177e4 | 715 | case NBD_PRINT_DEBUG: |
fd8383fd JB |
716 | /* |
717 | * For compatibility only, we no longer keep a list of | |
718 | * outstanding requests. | |
719 | */ | |
1da177e4 LT |
720 | return 0; |
721 | } | |
1a2ad211 PM |
722 | return -ENOTTY; |
723 | } | |
724 | ||
725 | static int nbd_ioctl(struct block_device *bdev, fmode_t mode, | |
726 | unsigned int cmd, unsigned long arg) | |
727 | { | |
f4507164 | 728 | struct nbd_device *nbd = bdev->bd_disk->private_data; |
1a2ad211 PM |
729 | int error; |
730 | ||
731 | if (!capable(CAP_SYS_ADMIN)) | |
732 | return -EPERM; | |
733 | ||
f4507164 | 734 | BUG_ON(nbd->magic != NBD_MAGIC); |
1a2ad211 | 735 | |
f4507164 WG |
736 | mutex_lock(&nbd->tx_lock); |
737 | error = __nbd_ioctl(bdev, nbd, cmd, arg); | |
738 | mutex_unlock(&nbd->tx_lock); | |
1a2ad211 PM |
739 | |
740 | return error; | |
1da177e4 LT |
741 | } |
742 | ||
83d5cde4 | 743 | static const struct block_device_operations nbd_fops = |
1da177e4 LT |
744 | { |
745 | .owner = THIS_MODULE, | |
8a6cfeb6 | 746 | .ioctl = nbd_ioctl, |
263a3df1 | 747 | .compat_ioctl = nbd_ioctl, |
1da177e4 LT |
748 | }; |
749 | ||
30d53d9c MP |
750 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
751 | ||
752 | static int nbd_dbg_tasks_show(struct seq_file *s, void *unused) | |
753 | { | |
754 | struct nbd_device *nbd = s->private; | |
755 | ||
756 | if (nbd->task_recv) | |
757 | seq_printf(s, "recv: %d\n", task_pid_nr(nbd->task_recv)); | |
758 | if (nbd->task_send) | |
759 | seq_printf(s, "send: %d\n", task_pid_nr(nbd->task_send)); | |
760 | ||
761 | return 0; | |
762 | } | |
763 | ||
764 | static int nbd_dbg_tasks_open(struct inode *inode, struct file *file) | |
765 | { | |
766 | return single_open(file, nbd_dbg_tasks_show, inode->i_private); | |
767 | } | |
768 | ||
769 | static const struct file_operations nbd_dbg_tasks_ops = { | |
770 | .open = nbd_dbg_tasks_open, | |
771 | .read = seq_read, | |
772 | .llseek = seq_lseek, | |
773 | .release = single_release, | |
774 | }; | |
775 | ||
776 | static int nbd_dbg_flags_show(struct seq_file *s, void *unused) | |
777 | { | |
778 | struct nbd_device *nbd = s->private; | |
779 | u32 flags = nbd->flags; | |
780 | ||
781 | seq_printf(s, "Hex: 0x%08x\n\n", flags); | |
782 | ||
783 | seq_puts(s, "Known flags:\n"); | |
784 | ||
785 | if (flags & NBD_FLAG_HAS_FLAGS) | |
786 | seq_puts(s, "NBD_FLAG_HAS_FLAGS\n"); | |
787 | if (flags & NBD_FLAG_READ_ONLY) | |
788 | seq_puts(s, "NBD_FLAG_READ_ONLY\n"); | |
789 | if (flags & NBD_FLAG_SEND_FLUSH) | |
790 | seq_puts(s, "NBD_FLAG_SEND_FLUSH\n"); | |
791 | if (flags & NBD_FLAG_SEND_TRIM) | |
792 | seq_puts(s, "NBD_FLAG_SEND_TRIM\n"); | |
793 | ||
794 | return 0; | |
795 | } | |
796 | ||
797 | static int nbd_dbg_flags_open(struct inode *inode, struct file *file) | |
798 | { | |
799 | return single_open(file, nbd_dbg_flags_show, inode->i_private); | |
800 | } | |
801 | ||
802 | static const struct file_operations nbd_dbg_flags_ops = { | |
803 | .open = nbd_dbg_flags_open, | |
804 | .read = seq_read, | |
805 | .llseek = seq_lseek, | |
806 | .release = single_release, | |
807 | }; | |
808 | ||
809 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
810 | { | |
811 | struct dentry *dir; | |
27ea43fe MP |
812 | |
813 | if (!nbd_dbg_dir) | |
814 | return -EIO; | |
30d53d9c MP |
815 | |
816 | dir = debugfs_create_dir(nbd_name(nbd), nbd_dbg_dir); | |
27ea43fe MP |
817 | if (!dir) { |
818 | dev_err(nbd_to_dev(nbd), "Failed to create debugfs dir for '%s'\n", | |
819 | nbd_name(nbd)); | |
820 | return -EIO; | |
30d53d9c MP |
821 | } |
822 | nbd->dbg_dir = dir; | |
823 | ||
27ea43fe MP |
824 | debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_ops); |
825 | debugfs_create_u64("size_bytes", 0444, dir, &nbd->bytesize); | |
826 | debugfs_create_u32("timeout", 0444, dir, &nbd->xmit_timeout); | |
827 | debugfs_create_u32("blocksize", 0444, dir, &nbd->blksize); | |
d366a0ff | 828 | debugfs_create_file("flags", 0444, dir, nbd, &nbd_dbg_flags_ops); |
30d53d9c MP |
829 | |
830 | return 0; | |
831 | } | |
832 | ||
833 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
834 | { | |
835 | debugfs_remove_recursive(nbd->dbg_dir); | |
836 | } | |
837 | ||
838 | static int nbd_dbg_init(void) | |
839 | { | |
840 | struct dentry *dbg_dir; | |
841 | ||
842 | dbg_dir = debugfs_create_dir("nbd", NULL); | |
27ea43fe MP |
843 | if (!dbg_dir) |
844 | return -EIO; | |
30d53d9c MP |
845 | |
846 | nbd_dbg_dir = dbg_dir; | |
847 | ||
848 | return 0; | |
849 | } | |
850 | ||
851 | static void nbd_dbg_close(void) | |
852 | { | |
853 | debugfs_remove_recursive(nbd_dbg_dir); | |
854 | } | |
855 | ||
856 | #else /* IS_ENABLED(CONFIG_DEBUG_FS) */ | |
857 | ||
858 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
859 | { | |
860 | return 0; | |
861 | } | |
862 | ||
863 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
864 | { | |
865 | } | |
866 | ||
867 | static int nbd_dbg_init(void) | |
868 | { | |
869 | return 0; | |
870 | } | |
871 | ||
872 | static void nbd_dbg_close(void) | |
873 | { | |
874 | } | |
875 | ||
876 | #endif | |
877 | ||
fd8383fd JB |
878 | static int nbd_init_request(void *data, struct request *rq, |
879 | unsigned int hctx_idx, unsigned int request_idx, | |
880 | unsigned int numa_node) | |
881 | { | |
882 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
883 | ||
884 | cmd->nbd = data; | |
885 | INIT_LIST_HEAD(&cmd->list); | |
886 | return 0; | |
887 | } | |
888 | ||
889 | static struct blk_mq_ops nbd_mq_ops = { | |
890 | .queue_rq = nbd_queue_rq, | |
891 | .map_queue = blk_mq_map_queue, | |
892 | .init_request = nbd_init_request, | |
893 | }; | |
894 | ||
1da177e4 LT |
895 | /* |
896 | * And here should be modules and kernel interface | |
897 | * (Just smiley confuses emacs :-) | |
898 | */ | |
899 | ||
900 | static int __init nbd_init(void) | |
901 | { | |
902 | int err = -ENOMEM; | |
903 | int i; | |
d71a6d73 | 904 | int part_shift; |
1da177e4 | 905 | |
5b7b18cc | 906 | BUILD_BUG_ON(sizeof(struct nbd_request) != 28); |
1da177e4 | 907 | |
d71a6d73 | 908 | if (max_part < 0) { |
7742ce4a | 909 | printk(KERN_ERR "nbd: max_part must be >= 0\n"); |
d71a6d73 LV |
910 | return -EINVAL; |
911 | } | |
912 | ||
913 | part_shift = 0; | |
5988ce23 | 914 | if (max_part > 0) { |
d71a6d73 LV |
915 | part_shift = fls(max_part); |
916 | ||
5988ce23 NK |
917 | /* |
918 | * Adjust max_part according to part_shift as it is exported | |
919 | * to user space so that user can know the max number of | |
920 | * partition kernel should be able to manage. | |
921 | * | |
922 | * Note that -1 is required because partition 0 is reserved | |
923 | * for the whole disk. | |
924 | */ | |
925 | max_part = (1UL << part_shift) - 1; | |
926 | } | |
927 | ||
3b271082 NK |
928 | if ((1UL << part_shift) > DISK_MAX_PARTS) |
929 | return -EINVAL; | |
930 | ||
931 | if (nbds_max > 1UL << (MINORBITS - part_shift)) | |
932 | return -EINVAL; | |
933 | ||
ff6b8090 SM |
934 | nbd_dev = kcalloc(nbds_max, sizeof(*nbd_dev), GFP_KERNEL); |
935 | if (!nbd_dev) | |
936 | return -ENOMEM; | |
937 | ||
40be0c28 | 938 | for (i = 0; i < nbds_max; i++) { |
d71a6d73 | 939 | struct gendisk *disk = alloc_disk(1 << part_shift); |
1da177e4 LT |
940 | if (!disk) |
941 | goto out; | |
942 | nbd_dev[i].disk = disk; | |
fd8383fd JB |
943 | |
944 | nbd_dev[i].tag_set.ops = &nbd_mq_ops; | |
945 | nbd_dev[i].tag_set.nr_hw_queues = 1; | |
946 | nbd_dev[i].tag_set.queue_depth = 128; | |
947 | nbd_dev[i].tag_set.numa_node = NUMA_NO_NODE; | |
948 | nbd_dev[i].tag_set.cmd_size = sizeof(struct nbd_cmd); | |
949 | nbd_dev[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE | | |
950 | BLK_MQ_F_SG_MERGE; | |
951 | nbd_dev[i].tag_set.driver_data = &nbd_dev[i]; | |
952 | ||
953 | err = blk_mq_alloc_tag_set(&nbd_dev[i].tag_set); | |
954 | if (err) { | |
955 | put_disk(disk); | |
956 | goto out; | |
957 | } | |
958 | ||
1da177e4 LT |
959 | /* |
960 | * The new linux 2.5 block layer implementation requires | |
961 | * every gendisk to have its very own request_queue struct. | |
962 | * These structs are big so we dynamically allocate them. | |
963 | */ | |
fd8383fd | 964 | disk->queue = blk_mq_init_queue(&nbd_dev[i].tag_set); |
1da177e4 | 965 | if (!disk->queue) { |
fd8383fd | 966 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
1da177e4 LT |
967 | put_disk(disk); |
968 | goto out; | |
969 | } | |
fd8383fd | 970 | |
31dcfab0 JA |
971 | /* |
972 | * Tell the block layer that we are not a rotational device | |
973 | */ | |
974 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, disk->queue); | |
b277da0a | 975 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, disk->queue); |
a336d298 | 976 | disk->queue->limits.discard_granularity = 512; |
2bb4cd5c | 977 | blk_queue_max_discard_sectors(disk->queue, UINT_MAX); |
a336d298 | 978 | disk->queue->limits.discard_zeroes_data = 0; |
078be02b MB |
979 | blk_queue_max_hw_sectors(disk->queue, 65536); |
980 | disk->queue->limits.max_sectors = 256; | |
1da177e4 LT |
981 | } |
982 | ||
983 | if (register_blkdev(NBD_MAJOR, "nbd")) { | |
984 | err = -EIO; | |
985 | goto out; | |
986 | } | |
987 | ||
988 | printk(KERN_INFO "nbd: registered device at major %d\n", NBD_MAJOR); | |
1da177e4 | 989 | |
30d53d9c MP |
990 | nbd_dbg_init(); |
991 | ||
40be0c28 | 992 | for (i = 0; i < nbds_max; i++) { |
1da177e4 | 993 | struct gendisk *disk = nbd_dev[i].disk; |
f4507164 | 994 | nbd_dev[i].magic = NBD_MAGIC; |
23272a67 | 995 | spin_lock_init(&nbd_dev[i].sock_lock); |
82d4dc5a | 996 | mutex_init(&nbd_dev[i].tx_lock); |
7e2893a1 MP |
997 | init_timer(&nbd_dev[i].timeout_timer); |
998 | nbd_dev[i].timeout_timer.function = nbd_xmit_timeout; | |
999 | nbd_dev[i].timeout_timer.data = (unsigned long)&nbd_dev[i]; | |
fd8383fd | 1000 | atomic_set(&nbd_dev[i].outstanding_cmds, 0); |
1da177e4 | 1001 | disk->major = NBD_MAJOR; |
d71a6d73 | 1002 | disk->first_minor = i << part_shift; |
1da177e4 LT |
1003 | disk->fops = &nbd_fops; |
1004 | disk->private_data = &nbd_dev[i]; | |
1da177e4 | 1005 | sprintf(disk->disk_name, "nbd%d", i); |
0e4f0f6f | 1006 | nbd_reset(&nbd_dev[i]); |
1da177e4 LT |
1007 | add_disk(disk); |
1008 | } | |
1009 | ||
1010 | return 0; | |
1011 | out: | |
1012 | while (i--) { | |
fd8383fd | 1013 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
1da177e4 LT |
1014 | blk_cleanup_queue(nbd_dev[i].disk->queue); |
1015 | put_disk(nbd_dev[i].disk); | |
1016 | } | |
f3944d61 | 1017 | kfree(nbd_dev); |
1da177e4 LT |
1018 | return err; |
1019 | } | |
1020 | ||
1021 | static void __exit nbd_cleanup(void) | |
1022 | { | |
1023 | int i; | |
30d53d9c MP |
1024 | |
1025 | nbd_dbg_close(); | |
1026 | ||
40be0c28 | 1027 | for (i = 0; i < nbds_max; i++) { |
1da177e4 | 1028 | struct gendisk *disk = nbd_dev[i].disk; |
40be0c28 | 1029 | nbd_dev[i].magic = 0; |
1da177e4 LT |
1030 | if (disk) { |
1031 | del_gendisk(disk); | |
1032 | blk_cleanup_queue(disk->queue); | |
fd8383fd | 1033 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
1da177e4 LT |
1034 | put_disk(disk); |
1035 | } | |
1036 | } | |
1da177e4 | 1037 | unregister_blkdev(NBD_MAJOR, "nbd"); |
f3944d61 | 1038 | kfree(nbd_dev); |
1da177e4 LT |
1039 | printk(KERN_INFO "nbd: unregistered device at major %d\n", NBD_MAJOR); |
1040 | } | |
1041 | ||
1042 | module_init(nbd_init); | |
1043 | module_exit(nbd_cleanup); | |
1044 | ||
1045 | MODULE_DESCRIPTION("Network Block Device"); | |
1046 | MODULE_LICENSE("GPL"); | |
1047 | ||
40be0c28 | 1048 | module_param(nbds_max, int, 0444); |
d71a6d73 LV |
1049 | MODULE_PARM_DESC(nbds_max, "number of network block devices to initialize (default: 16)"); |
1050 | module_param(max_part, int, 0444); | |
1051 | MODULE_PARM_DESC(max_part, "number of partitions per device (default: 0)"); |