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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 JB |
53 | atomic_t outstanding_cmds; |
54 | struct blk_mq_tag_set tag_set; | |
13e71d69 MP |
55 | |
56 | struct mutex tx_lock; | |
57 | struct gendisk *disk; | |
58 | int blksize; | |
b9c495bb | 59 | loff_t bytesize; |
13e71d69 | 60 | int xmit_timeout; |
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 | ||
fd8383fd JB |
73 | struct nbd_cmd { |
74 | struct nbd_device *nbd; | |
75 | struct list_head list; | |
76 | }; | |
77 | ||
30d53d9c MP |
78 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
79 | static struct dentry *nbd_dbg_dir; | |
80 | #endif | |
81 | ||
82 | #define nbd_name(nbd) ((nbd)->disk->disk_name) | |
83 | ||
f4507164 | 84 | #define NBD_MAGIC 0x68797548 |
1da177e4 | 85 | |
9c7a4169 | 86 | static unsigned int nbds_max = 16; |
20a8143e | 87 | static struct nbd_device *nbd_dev; |
d71a6d73 | 88 | static int max_part; |
1da177e4 | 89 | |
d18509f5 | 90 | static inline struct device *nbd_to_dev(struct nbd_device *nbd) |
1da177e4 | 91 | { |
d18509f5 | 92 | return disk_to_dev(nbd->disk); |
1da177e4 LT |
93 | } |
94 | ||
37091fdd MP |
95 | static bool nbd_is_connected(struct nbd_device *nbd) |
96 | { | |
97 | return !!nbd->task_recv; | |
98 | } | |
99 | ||
1da177e4 LT |
100 | static const char *nbdcmd_to_ascii(int cmd) |
101 | { | |
102 | switch (cmd) { | |
103 | case NBD_CMD_READ: return "read"; | |
104 | case NBD_CMD_WRITE: return "write"; | |
105 | case NBD_CMD_DISC: return "disconnect"; | |
75f187ab | 106 | case NBD_CMD_FLUSH: return "flush"; |
a336d298 | 107 | case NBD_CMD_TRIM: return "trim/discard"; |
1da177e4 LT |
108 | } |
109 | return "invalid"; | |
110 | } | |
1da177e4 | 111 | |
37091fdd MP |
112 | static int nbd_size_clear(struct nbd_device *nbd, struct block_device *bdev) |
113 | { | |
114 | bdev->bd_inode->i_size = 0; | |
115 | set_capacity(nbd->disk, 0); | |
116 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static void nbd_size_update(struct nbd_device *nbd, struct block_device *bdev) | |
122 | { | |
123 | if (!nbd_is_connected(nbd)) | |
124 | return; | |
125 | ||
126 | bdev->bd_inode->i_size = nbd->bytesize; | |
127 | set_capacity(nbd->disk, nbd->bytesize >> 9); | |
128 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); | |
129 | } | |
130 | ||
131 | static int nbd_size_set(struct nbd_device *nbd, struct block_device *bdev, | |
132 | int blocksize, int nr_blocks) | |
133 | { | |
134 | int ret; | |
135 | ||
136 | ret = set_blocksize(bdev, blocksize); | |
137 | if (ret) | |
138 | return ret; | |
139 | ||
140 | nbd->blksize = blocksize; | |
141 | nbd->bytesize = (loff_t)blocksize * (loff_t)nr_blocks; | |
142 | ||
143 | nbd_size_update(nbd, bdev); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
fd8383fd | 148 | static void nbd_end_request(struct nbd_cmd *cmd) |
1da177e4 | 149 | { |
fd8383fd JB |
150 | struct nbd_device *nbd = cmd->nbd; |
151 | struct request *req = blk_mq_rq_from_pdu(cmd); | |
097c94a4 | 152 | int error = req->errors ? -EIO : 0; |
1da177e4 | 153 | |
fd8383fd | 154 | dev_dbg(nbd_to_dev(nbd), "request %p: %s\n", cmd, |
d18509f5 | 155 | error ? "failed" : "done"); |
1da177e4 | 156 | |
fd8383fd JB |
157 | atomic_dec(&nbd->outstanding_cmds); |
158 | blk_mq_complete_request(req, error); | |
1da177e4 LT |
159 | } |
160 | ||
e018e757 MP |
161 | /* |
162 | * Forcibly shutdown the socket causing all listeners to error | |
163 | */ | |
36e47bee | 164 | static void sock_shutdown(struct nbd_device *nbd) |
7fdfd406 | 165 | { |
c2611898 JB |
166 | struct socket *sock; |
167 | ||
23272a67 MP |
168 | spin_lock_irq(&nbd->sock_lock); |
169 | ||
170 | if (!nbd->sock) { | |
171 | spin_unlock_irq(&nbd->sock_lock); | |
260bbce4 | 172 | return; |
23272a67 | 173 | } |
260bbce4 | 174 | |
c2611898 | 175 | sock = nbd->sock; |
260bbce4 | 176 | dev_warn(disk_to_dev(nbd->disk), "shutting down socket\n"); |
260bbce4 | 177 | nbd->sock = NULL; |
23272a67 MP |
178 | spin_unlock_irq(&nbd->sock_lock); |
179 | ||
c2611898 JB |
180 | kernel_sock_shutdown(sock, SHUT_RDWR); |
181 | sockfd_put(sock); | |
182 | ||
23272a67 | 183 | del_timer(&nbd->timeout_timer); |
7fdfd406 PC |
184 | } |
185 | ||
186 | static void nbd_xmit_timeout(unsigned long arg) | |
187 | { | |
7e2893a1 | 188 | struct nbd_device *nbd = (struct nbd_device *)arg; |
c2611898 | 189 | struct socket *sock = NULL; |
dcc909d9 | 190 | unsigned long flags; |
7e2893a1 | 191 | |
fd8383fd | 192 | if (!atomic_read(&nbd->outstanding_cmds)) |
7e2893a1 MP |
193 | return; |
194 | ||
23272a67 | 195 | spin_lock_irqsave(&nbd->sock_lock, flags); |
dcc909d9 | 196 | |
9b4a6ba9 | 197 | set_bit(NBD_TIMEDOUT, &nbd->runtime_flags); |
7fdfd406 | 198 | |
c2611898 JB |
199 | if (nbd->sock) { |
200 | sock = nbd->sock; | |
201 | get_file(sock->file); | |
202 | } | |
7e2893a1 | 203 | |
23272a67 | 204 | spin_unlock_irqrestore(&nbd->sock_lock, flags); |
c2611898 JB |
205 | if (sock) { |
206 | kernel_sock_shutdown(sock, SHUT_RDWR); | |
207 | sockfd_put(sock); | |
208 | } | |
dcc909d9 | 209 | |
23272a67 | 210 | dev_err(nbd_to_dev(nbd), "Connection timed out, shutting down connection\n"); |
7fdfd406 PC |
211 | } |
212 | ||
1da177e4 LT |
213 | /* |
214 | * Send or receive packet. | |
215 | */ | |
f4507164 | 216 | static int sock_xmit(struct nbd_device *nbd, int send, void *buf, int size, |
1da177e4 LT |
217 | int msg_flags) |
218 | { | |
f4507164 | 219 | struct socket *sock = nbd->sock; |
1da177e4 LT |
220 | int result; |
221 | struct msghdr msg; | |
222 | struct kvec iov; | |
7f338fe4 | 223 | unsigned long pflags = current->flags; |
1da177e4 | 224 | |
ffc41cf8 | 225 | if (unlikely(!sock)) { |
f4507164 | 226 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
227 | "Attempted %s on closed socket in sock_xmit\n", |
228 | (send ? "send" : "recv")); | |
ffc41cf8 MS |
229 | return -EINVAL; |
230 | } | |
231 | ||
7f338fe4 | 232 | current->flags |= PF_MEMALLOC; |
1da177e4 | 233 | do { |
7f338fe4 | 234 | sock->sk->sk_allocation = GFP_NOIO | __GFP_MEMALLOC; |
1da177e4 LT |
235 | iov.iov_base = buf; |
236 | iov.iov_len = size; | |
237 | msg.msg_name = NULL; | |
238 | msg.msg_namelen = 0; | |
239 | msg.msg_control = NULL; | |
240 | msg.msg_controllen = 0; | |
1da177e4 LT |
241 | msg.msg_flags = msg_flags | MSG_NOSIGNAL; |
242 | ||
7e2893a1 | 243 | if (send) |
1da177e4 | 244 | result = kernel_sendmsg(sock, &msg, &iov, 1, size); |
7e2893a1 | 245 | else |
35fbf5bc NK |
246 | result = kernel_recvmsg(sock, &msg, &iov, 1, size, |
247 | msg.msg_flags); | |
1da177e4 | 248 | |
1da177e4 LT |
249 | if (result <= 0) { |
250 | if (result == 0) | |
251 | result = -EPIPE; /* short read */ | |
252 | break; | |
253 | } | |
254 | size -= result; | |
255 | buf += result; | |
256 | } while (size > 0); | |
257 | ||
7f338fe4 | 258 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
1da177e4 | 259 | |
7e2893a1 MP |
260 | if (!send && nbd->xmit_timeout) |
261 | mod_timer(&nbd->timeout_timer, jiffies + nbd->xmit_timeout); | |
262 | ||
1da177e4 LT |
263 | return result; |
264 | } | |
265 | ||
f4507164 | 266 | static inline int sock_send_bvec(struct nbd_device *nbd, struct bio_vec *bvec, |
1da177e4 LT |
267 | int flags) |
268 | { | |
269 | int result; | |
270 | void *kaddr = kmap(bvec->bv_page); | |
f4507164 WG |
271 | result = sock_xmit(nbd, 1, kaddr + bvec->bv_offset, |
272 | bvec->bv_len, flags); | |
1da177e4 LT |
273 | kunmap(bvec->bv_page); |
274 | return result; | |
275 | } | |
276 | ||
7fdfd406 | 277 | /* always call with the tx_lock held */ |
fd8383fd | 278 | static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd) |
1da177e4 | 279 | { |
fd8383fd | 280 | struct request *req = blk_mq_rq_from_pdu(cmd); |
5705f702 | 281 | int result, flags; |
1da177e4 | 282 | struct nbd_request request; |
1011c1b9 | 283 | unsigned long size = blk_rq_bytes(req); |
9dc6c806 CH |
284 | u32 type; |
285 | ||
286 | if (req->cmd_type == REQ_TYPE_DRV_PRIV) | |
287 | type = NBD_CMD_DISC; | |
c2df40df | 288 | else if (req_op(req) == REQ_OP_DISCARD) |
9dc6c806 | 289 | type = NBD_CMD_TRIM; |
3a5e02ce | 290 | else if (req_op(req) == REQ_OP_FLUSH) |
9dc6c806 CH |
291 | type = NBD_CMD_FLUSH; |
292 | else if (rq_data_dir(req) == WRITE) | |
293 | type = NBD_CMD_WRITE; | |
294 | else | |
295 | type = NBD_CMD_READ; | |
1da177e4 | 296 | |
04cfac4e | 297 | memset(&request, 0, sizeof(request)); |
1da177e4 | 298 | request.magic = htonl(NBD_REQUEST_MAGIC); |
9dc6c806 CH |
299 | request.type = htonl(type); |
300 | if (type != NBD_CMD_FLUSH && type != NBD_CMD_DISC) { | |
75f187ab AB |
301 | request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9); |
302 | request.len = htonl(size); | |
303 | } | |
fd8383fd | 304 | memcpy(request.handle, &req->tag, sizeof(req->tag)); |
1da177e4 | 305 | |
d18509f5 | 306 | dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n", |
fd8383fd | 307 | cmd, nbdcmd_to_ascii(type), |
d18509f5 | 308 | (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req)); |
f4507164 | 309 | result = sock_xmit(nbd, 1, &request, sizeof(request), |
9dc6c806 | 310 | (type == NBD_CMD_WRITE) ? MSG_MORE : 0); |
1da177e4 | 311 | if (result <= 0) { |
f4507164 | 312 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 | 313 | "Send control failed (result %d)\n", result); |
dab5313a | 314 | return -EIO; |
1da177e4 LT |
315 | } |
316 | ||
9dc6c806 | 317 | if (type == NBD_CMD_WRITE) { |
5705f702 | 318 | struct req_iterator iter; |
7988613b | 319 | struct bio_vec bvec; |
1da177e4 LT |
320 | /* |
321 | * we are really probing at internals to determine | |
322 | * whether to set MSG_MORE or not... | |
323 | */ | |
5705f702 | 324 | rq_for_each_segment(bvec, req, iter) { |
6c92e699 | 325 | flags = 0; |
4550dd6c | 326 | if (!rq_iter_last(bvec, iter)) |
6c92e699 | 327 | flags = MSG_MORE; |
d18509f5 | 328 | dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n", |
fd8383fd | 329 | cmd, bvec.bv_len); |
7988613b | 330 | result = sock_send_bvec(nbd, &bvec, flags); |
6c92e699 | 331 | if (result <= 0) { |
f4507164 | 332 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
333 | "Send data failed (result %d)\n", |
334 | result); | |
dab5313a | 335 | return -EIO; |
6c92e699 | 336 | } |
1da177e4 LT |
337 | } |
338 | } | |
1da177e4 | 339 | return 0; |
1da177e4 LT |
340 | } |
341 | ||
f4507164 | 342 | static inline int sock_recv_bvec(struct nbd_device *nbd, struct bio_vec *bvec) |
1da177e4 LT |
343 | { |
344 | int result; | |
345 | void *kaddr = kmap(bvec->bv_page); | |
f4507164 | 346 | result = sock_xmit(nbd, 0, kaddr + bvec->bv_offset, bvec->bv_len, |
1da177e4 LT |
347 | MSG_WAITALL); |
348 | kunmap(bvec->bv_page); | |
349 | return result; | |
350 | } | |
351 | ||
352 | /* NULL returned = something went wrong, inform userspace */ | |
fd8383fd | 353 | static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd) |
1da177e4 LT |
354 | { |
355 | int result; | |
356 | struct nbd_reply reply; | |
fd8383fd JB |
357 | struct nbd_cmd *cmd; |
358 | struct request *req = NULL; | |
359 | u16 hwq; | |
360 | int tag; | |
1da177e4 LT |
361 | |
362 | reply.magic = 0; | |
f4507164 | 363 | result = sock_xmit(nbd, 0, &reply, sizeof(reply), MSG_WAITALL); |
1da177e4 | 364 | if (result <= 0) { |
f4507164 | 365 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 | 366 | "Receive control failed (result %d)\n", result); |
19391830 | 367 | return ERR_PTR(result); |
1da177e4 | 368 | } |
e4b57e08 MF |
369 | |
370 | if (ntohl(reply.magic) != NBD_REPLY_MAGIC) { | |
f4507164 | 371 | dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n", |
e4b57e08 | 372 | (unsigned long)ntohl(reply.magic)); |
19391830 | 373 | return ERR_PTR(-EPROTO); |
e4b57e08 MF |
374 | } |
375 | ||
fd8383fd | 376 | memcpy(&tag, reply.handle, sizeof(int)); |
4b2f0260 | 377 | |
fd8383fd JB |
378 | hwq = blk_mq_unique_tag_to_hwq(tag); |
379 | if (hwq < nbd->tag_set.nr_hw_queues) | |
380 | req = blk_mq_tag_to_rq(nbd->tag_set.tags[hwq], | |
381 | blk_mq_unique_tag_to_tag(tag)); | |
382 | if (!req || !blk_mq_request_started(req)) { | |
383 | dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%d) %p\n", | |
384 | tag, req); | |
385 | return ERR_PTR(-ENOENT); | |
1da177e4 | 386 | } |
fd8383fd | 387 | cmd = blk_mq_rq_to_pdu(req); |
1da177e4 | 388 | |
1da177e4 | 389 | if (ntohl(reply.error)) { |
f4507164 | 390 | dev_err(disk_to_dev(nbd->disk), "Other side returned error (%d)\n", |
7f1b90f9 | 391 | ntohl(reply.error)); |
1da177e4 | 392 | req->errors++; |
fd8383fd | 393 | return cmd; |
1da177e4 LT |
394 | } |
395 | ||
fd8383fd | 396 | dev_dbg(nbd_to_dev(nbd), "request %p: got reply\n", cmd); |
9dc6c806 | 397 | if (rq_data_dir(req) != WRITE) { |
5705f702 | 398 | struct req_iterator iter; |
7988613b | 399 | struct bio_vec bvec; |
5705f702 N |
400 | |
401 | rq_for_each_segment(bvec, req, iter) { | |
7988613b | 402 | result = sock_recv_bvec(nbd, &bvec); |
6c92e699 | 403 | if (result <= 0) { |
f4507164 | 404 | dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n", |
7f1b90f9 | 405 | result); |
6c92e699 | 406 | req->errors++; |
fd8383fd | 407 | return cmd; |
6c92e699 | 408 | } |
d18509f5 | 409 | dev_dbg(nbd_to_dev(nbd), "request %p: got %d bytes data\n", |
fd8383fd | 410 | cmd, bvec.bv_len); |
1da177e4 LT |
411 | } |
412 | } | |
fd8383fd | 413 | return cmd; |
1da177e4 LT |
414 | } |
415 | ||
edfaa7c3 KS |
416 | static ssize_t pid_show(struct device *dev, |
417 | struct device_attribute *attr, char *buf) | |
6b39bb65 | 418 | { |
edfaa7c3 | 419 | struct gendisk *disk = dev_to_disk(dev); |
6521d39a | 420 | struct nbd_device *nbd = (struct nbd_device *)disk->private_data; |
edfaa7c3 | 421 | |
6521d39a | 422 | return sprintf(buf, "%d\n", task_pid_nr(nbd->task_recv)); |
6b39bb65 PC |
423 | } |
424 | ||
edfaa7c3 | 425 | static struct device_attribute pid_attr = { |
01e8ef11 | 426 | .attr = { .name = "pid", .mode = S_IRUGO}, |
6b39bb65 PC |
427 | .show = pid_show, |
428 | }; | |
429 | ||
37091fdd | 430 | static int nbd_thread_recv(struct nbd_device *nbd, struct block_device *bdev) |
1da177e4 | 431 | { |
fd8383fd | 432 | struct nbd_cmd *cmd; |
84963048 | 433 | int ret; |
1da177e4 | 434 | |
f4507164 | 435 | BUG_ON(nbd->magic != NBD_MAGIC); |
1da177e4 | 436 | |
7f338fe4 | 437 | sk_set_memalloc(nbd->sock->sk); |
6521d39a | 438 | |
f4507164 | 439 | ret = device_create_file(disk_to_dev(nbd->disk), &pid_attr); |
84963048 | 440 | if (ret) { |
f4507164 | 441 | dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n"); |
84963048 WC |
442 | return ret; |
443 | } | |
6b39bb65 | 444 | |
37091fdd MP |
445 | nbd_size_update(nbd, bdev); |
446 | ||
19391830 | 447 | while (1) { |
fd8383fd JB |
448 | cmd = nbd_read_stat(nbd); |
449 | if (IS_ERR(cmd)) { | |
450 | ret = PTR_ERR(cmd); | |
19391830 MP |
451 | break; |
452 | } | |
453 | ||
fd8383fd | 454 | nbd_end_request(cmd); |
19391830 | 455 | } |
6b39bb65 | 456 | |
37091fdd MP |
457 | nbd_size_clear(nbd, bdev); |
458 | ||
6521d39a | 459 | device_remove_file(disk_to_dev(nbd->disk), &pid_attr); |
7e2893a1 | 460 | return ret; |
1da177e4 LT |
461 | } |
462 | ||
fd8383fd | 463 | static void nbd_clear_req(struct request *req, void *data, bool reserved) |
1da177e4 | 464 | { |
fd8383fd | 465 | struct nbd_cmd *cmd; |
1da177e4 | 466 | |
fd8383fd JB |
467 | if (!blk_mq_request_started(req)) |
468 | return; | |
469 | cmd = blk_mq_rq_to_pdu(req); | |
470 | req->errors++; | |
471 | nbd_end_request(cmd); | |
472 | } | |
473 | ||
474 | static void nbd_clear_que(struct nbd_device *nbd) | |
475 | { | |
f4507164 | 476 | BUG_ON(nbd->magic != NBD_MAGIC); |
1da177e4 | 477 | |
4b2f0260 | 478 | /* |
f4507164 | 479 | * Because we have set nbd->sock to NULL under the tx_lock, all |
fd8383fd | 480 | * modifications to the list must have completed by now. |
4b2f0260 | 481 | */ |
f4507164 | 482 | BUG_ON(nbd->sock); |
4b2f0260 | 483 | |
fd8383fd | 484 | blk_mq_tagset_busy_iter(&nbd->tag_set, nbd_clear_req, NULL); |
e78273c8 | 485 | dev_dbg(disk_to_dev(nbd->disk), "queue cleared\n"); |
1da177e4 LT |
486 | } |
487 | ||
7fdfd406 | 488 | |
fd8383fd | 489 | static void nbd_handle_cmd(struct nbd_cmd *cmd) |
48cf6061 | 490 | { |
fd8383fd JB |
491 | struct request *req = blk_mq_rq_from_pdu(cmd); |
492 | struct nbd_device *nbd = cmd->nbd; | |
493 | ||
33659ebb | 494 | if (req->cmd_type != REQ_TYPE_FS) |
48cf6061 LV |
495 | goto error_out; |
496 | ||
9dc6c806 CH |
497 | if (rq_data_dir(req) == WRITE && |
498 | (nbd->flags & NBD_FLAG_READ_ONLY)) { | |
499 | dev_err(disk_to_dev(nbd->disk), | |
500 | "Write on read-only\n"); | |
501 | goto error_out; | |
75f187ab AB |
502 | } |
503 | ||
48cf6061 LV |
504 | req->errors = 0; |
505 | ||
f4507164 | 506 | mutex_lock(&nbd->tx_lock); |
fd8383fd | 507 | nbd->task_send = current; |
f4507164 WG |
508 | if (unlikely(!nbd->sock)) { |
509 | mutex_unlock(&nbd->tx_lock); | |
510 | dev_err(disk_to_dev(nbd->disk), | |
7f1b90f9 | 511 | "Attempted send on closed socket\n"); |
15746fca | 512 | goto error_out; |
48cf6061 LV |
513 | } |
514 | ||
fd8383fd | 515 | if (nbd->xmit_timeout && !atomic_read(&nbd->outstanding_cmds)) |
7e2893a1 MP |
516 | mod_timer(&nbd->timeout_timer, jiffies + nbd->xmit_timeout); |
517 | ||
fd8383fd JB |
518 | atomic_inc(&nbd->outstanding_cmds); |
519 | if (nbd_send_cmd(nbd, cmd) != 0) { | |
f4507164 | 520 | dev_err(disk_to_dev(nbd->disk), "Request send failed\n"); |
48cf6061 | 521 | req->errors++; |
fd8383fd | 522 | nbd_end_request(cmd); |
48cf6061 LV |
523 | } |
524 | ||
fd8383fd | 525 | nbd->task_send = NULL; |
f4507164 | 526 | mutex_unlock(&nbd->tx_lock); |
48cf6061 LV |
527 | |
528 | return; | |
529 | ||
530 | error_out: | |
531 | req->errors++; | |
fd8383fd | 532 | nbd_end_request(cmd); |
48cf6061 LV |
533 | } |
534 | ||
fd8383fd JB |
535 | static int nbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
536 | const struct blk_mq_queue_data *bd) | |
1da177e4 | 537 | { |
fd8383fd | 538 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
1da177e4 | 539 | |
fd8383fd JB |
540 | blk_mq_start_request(bd->rq); |
541 | nbd_handle_cmd(cmd); | |
542 | return BLK_MQ_RQ_QUEUE_OK; | |
1da177e4 LT |
543 | } |
544 | ||
23272a67 MP |
545 | static int nbd_set_socket(struct nbd_device *nbd, struct socket *sock) |
546 | { | |
547 | int ret = 0; | |
548 | ||
549 | spin_lock_irq(&nbd->sock_lock); | |
550 | ||
551 | if (nbd->sock) { | |
552 | ret = -EBUSY; | |
553 | goto out; | |
554 | } | |
555 | ||
556 | nbd->sock = sock; | |
557 | ||
558 | out: | |
559 | spin_unlock_irq(&nbd->sock_lock); | |
560 | ||
561 | return ret; | |
562 | } | |
563 | ||
0e4f0f6f MP |
564 | /* Reset all properties of an NBD device */ |
565 | static void nbd_reset(struct nbd_device *nbd) | |
566 | { | |
9b4a6ba9 | 567 | nbd->runtime_flags = 0; |
0e4f0f6f MP |
568 | nbd->blksize = 1024; |
569 | nbd->bytesize = 0; | |
570 | set_capacity(nbd->disk, 0); | |
571 | nbd->flags = 0; | |
572 | nbd->xmit_timeout = 0; | |
573 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); | |
574 | del_timer_sync(&nbd->timeout_timer); | |
575 | } | |
576 | ||
577 | static void nbd_bdev_reset(struct block_device *bdev) | |
578 | { | |
579 | set_device_ro(bdev, false); | |
580 | bdev->bd_inode->i_size = 0; | |
581 | if (max_part > 0) { | |
582 | blkdev_reread_part(bdev); | |
583 | bdev->bd_invalidated = 1; | |
584 | } | |
585 | } | |
586 | ||
d02cf531 MP |
587 | static void nbd_parse_flags(struct nbd_device *nbd, struct block_device *bdev) |
588 | { | |
589 | if (nbd->flags & NBD_FLAG_READ_ONLY) | |
590 | set_device_ro(bdev, true); | |
591 | if (nbd->flags & NBD_FLAG_SEND_TRIM) | |
592 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); | |
593 | if (nbd->flags & NBD_FLAG_SEND_FLUSH) | |
aafb1eec | 594 | blk_queue_write_cache(nbd->disk->queue, true, false); |
d02cf531 | 595 | else |
aafb1eec | 596 | blk_queue_write_cache(nbd->disk->queue, false, false); |
d02cf531 MP |
597 | } |
598 | ||
30d53d9c MP |
599 | static int nbd_dev_dbg_init(struct nbd_device *nbd); |
600 | static void nbd_dev_dbg_close(struct nbd_device *nbd); | |
601 | ||
1a2ad211 | 602 | /* Must be called with tx_lock held */ |
1da177e4 | 603 | |
f4507164 | 604 | static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, |
1a2ad211 PM |
605 | unsigned int cmd, unsigned long arg) |
606 | { | |
1da177e4 | 607 | switch (cmd) { |
1a2ad211 | 608 | case NBD_DISCONNECT: { |
fd8383fd | 609 | struct request *sreq; |
1a2ad211 | 610 | |
f4507164 | 611 | dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n"); |
3a2d63f8 PB |
612 | if (!nbd->sock) |
613 | return -EINVAL; | |
1a2ad211 | 614 | |
fd8383fd JB |
615 | sreq = blk_mq_alloc_request(bdev_get_queue(bdev), WRITE, 0); |
616 | if (!sreq) | |
617 | return -ENOMEM; | |
618 | ||
3a2d63f8 PB |
619 | mutex_unlock(&nbd->tx_lock); |
620 | fsync_bdev(bdev); | |
621 | mutex_lock(&nbd->tx_lock); | |
fd8383fd | 622 | sreq->cmd_type = REQ_TYPE_DRV_PRIV; |
3a2d63f8 PB |
623 | |
624 | /* Check again after getting mutex back. */ | |
fd8383fd JB |
625 | if (!nbd->sock) { |
626 | blk_mq_free_request(sreq); | |
1da177e4 | 627 | return -EINVAL; |
fd8383fd | 628 | } |
3a2d63f8 | 629 | |
9b4a6ba9 | 630 | set_bit(NBD_DISCONNECT_REQUESTED, &nbd->runtime_flags); |
c378f70a | 631 | |
fd8383fd JB |
632 | nbd_send_cmd(nbd, blk_mq_rq_to_pdu(sreq)); |
633 | blk_mq_free_request(sreq); | |
c378f70a | 634 | return 0; |
1a2ad211 | 635 | } |
1da177e4 | 636 | |
23272a67 MP |
637 | case NBD_CLEAR_SOCK: |
638 | sock_shutdown(nbd); | |
f4507164 | 639 | nbd_clear_que(nbd); |
3a2d63f8 | 640 | kill_bdev(bdev); |
1a2ad211 | 641 | return 0; |
1a2ad211 PM |
642 | |
643 | case NBD_SET_SOCK: { | |
e2511578 | 644 | int err; |
23272a67 MP |
645 | struct socket *sock = sockfd_lookup(arg, &err); |
646 | ||
647 | if (!sock) | |
648 | return err; | |
649 | ||
650 | err = nbd_set_socket(nbd, sock); | |
651 | if (!err && max_part) | |
652 | bdev->bd_invalidated = 1; | |
653 | ||
654 | return err; | |
1a2ad211 PM |
655 | } |
656 | ||
37091fdd | 657 | case NBD_SET_BLKSIZE: { |
5e454c67 | 658 | loff_t bsize = div_s64(nbd->bytesize, arg); |
37091fdd MP |
659 | |
660 | return nbd_size_set(nbd, bdev, arg, bsize); | |
661 | } | |
1a2ad211 | 662 | |
1da177e4 | 663 | case NBD_SET_SIZE: |
37091fdd MP |
664 | return nbd_size_set(nbd, bdev, nbd->blksize, |
665 | arg / nbd->blksize); | |
666 | ||
667 | case NBD_SET_SIZE_BLOCKS: | |
668 | return nbd_size_set(nbd, bdev, nbd->blksize, arg); | |
1a2ad211 | 669 | |
7fdfd406 | 670 | case NBD_SET_TIMEOUT: |
f4507164 | 671 | nbd->xmit_timeout = arg * HZ; |
7e2893a1 MP |
672 | if (arg) |
673 | mod_timer(&nbd->timeout_timer, | |
674 | jiffies + nbd->xmit_timeout); | |
675 | else | |
676 | del_timer_sync(&nbd->timeout_timer); | |
677 | ||
7fdfd406 | 678 | return 0; |
1a2ad211 | 679 | |
2f012508 PC |
680 | case NBD_SET_FLAGS: |
681 | nbd->flags = arg; | |
682 | return 0; | |
683 | ||
1a2ad211 | 684 | case NBD_DO_IT: { |
1a2ad211 PM |
685 | int error; |
686 | ||
6521d39a | 687 | if (nbd->task_recv) |
c91192d6 | 688 | return -EBUSY; |
e2511578 | 689 | if (!nbd->sock) |
1da177e4 | 690 | return -EINVAL; |
1a2ad211 | 691 | |
97240963 VN |
692 | /* We have to claim the device under the lock */ |
693 | nbd->task_recv = current; | |
f4507164 | 694 | mutex_unlock(&nbd->tx_lock); |
1a2ad211 | 695 | |
d02cf531 | 696 | nbd_parse_flags(nbd, bdev); |
a336d298 | 697 | |
30d53d9c | 698 | nbd_dev_dbg_init(nbd); |
37091fdd | 699 | error = nbd_thread_recv(nbd, bdev); |
30d53d9c | 700 | nbd_dev_dbg_close(nbd); |
1a2ad211 | 701 | |
f4507164 | 702 | mutex_lock(&nbd->tx_lock); |
97240963 | 703 | nbd->task_recv = NULL; |
19391830 | 704 | |
36e47bee | 705 | sock_shutdown(nbd); |
f4507164 | 706 | nbd_clear_que(nbd); |
3a2d63f8 | 707 | kill_bdev(bdev); |
0e4f0f6f MP |
708 | nbd_bdev_reset(bdev); |
709 | ||
9b4a6ba9 JB |
710 | /* user requested, ignore socket errors */ |
711 | if (test_bit(NBD_DISCONNECT_REQUESTED, &nbd->runtime_flags)) | |
1f7b5cf1 | 712 | error = 0; |
9b4a6ba9 | 713 | if (test_bit(NBD_TIMEDOUT, &nbd->runtime_flags)) |
1f7b5cf1 MP |
714 | error = -ETIMEDOUT; |
715 | ||
0e4f0f6f MP |
716 | nbd_reset(nbd); |
717 | ||
19391830 | 718 | return error; |
1a2ad211 PM |
719 | } |
720 | ||
1da177e4 | 721 | case NBD_CLEAR_QUE: |
4b2f0260 HX |
722 | /* |
723 | * This is for compatibility only. The queue is always cleared | |
724 | * by NBD_DO_IT or NBD_CLEAR_SOCK. | |
725 | */ | |
1da177e4 | 726 | return 0; |
1a2ad211 | 727 | |
1da177e4 | 728 | case NBD_PRINT_DEBUG: |
fd8383fd JB |
729 | /* |
730 | * For compatibility only, we no longer keep a list of | |
731 | * outstanding requests. | |
732 | */ | |
1da177e4 LT |
733 | return 0; |
734 | } | |
1a2ad211 PM |
735 | return -ENOTTY; |
736 | } | |
737 | ||
738 | static int nbd_ioctl(struct block_device *bdev, fmode_t mode, | |
739 | unsigned int cmd, unsigned long arg) | |
740 | { | |
f4507164 | 741 | struct nbd_device *nbd = bdev->bd_disk->private_data; |
1a2ad211 PM |
742 | int error; |
743 | ||
744 | if (!capable(CAP_SYS_ADMIN)) | |
745 | return -EPERM; | |
746 | ||
f4507164 | 747 | BUG_ON(nbd->magic != NBD_MAGIC); |
1a2ad211 | 748 | |
f4507164 WG |
749 | mutex_lock(&nbd->tx_lock); |
750 | error = __nbd_ioctl(bdev, nbd, cmd, arg); | |
751 | mutex_unlock(&nbd->tx_lock); | |
1a2ad211 PM |
752 | |
753 | return error; | |
1da177e4 LT |
754 | } |
755 | ||
83d5cde4 | 756 | static const struct block_device_operations nbd_fops = |
1da177e4 LT |
757 | { |
758 | .owner = THIS_MODULE, | |
8a6cfeb6 | 759 | .ioctl = nbd_ioctl, |
263a3df1 | 760 | .compat_ioctl = nbd_ioctl, |
1da177e4 LT |
761 | }; |
762 | ||
30d53d9c MP |
763 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
764 | ||
765 | static int nbd_dbg_tasks_show(struct seq_file *s, void *unused) | |
766 | { | |
767 | struct nbd_device *nbd = s->private; | |
768 | ||
769 | if (nbd->task_recv) | |
770 | seq_printf(s, "recv: %d\n", task_pid_nr(nbd->task_recv)); | |
771 | if (nbd->task_send) | |
772 | seq_printf(s, "send: %d\n", task_pid_nr(nbd->task_send)); | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | static int nbd_dbg_tasks_open(struct inode *inode, struct file *file) | |
778 | { | |
779 | return single_open(file, nbd_dbg_tasks_show, inode->i_private); | |
780 | } | |
781 | ||
782 | static const struct file_operations nbd_dbg_tasks_ops = { | |
783 | .open = nbd_dbg_tasks_open, | |
784 | .read = seq_read, | |
785 | .llseek = seq_lseek, | |
786 | .release = single_release, | |
787 | }; | |
788 | ||
789 | static int nbd_dbg_flags_show(struct seq_file *s, void *unused) | |
790 | { | |
791 | struct nbd_device *nbd = s->private; | |
792 | u32 flags = nbd->flags; | |
793 | ||
794 | seq_printf(s, "Hex: 0x%08x\n\n", flags); | |
795 | ||
796 | seq_puts(s, "Known flags:\n"); | |
797 | ||
798 | if (flags & NBD_FLAG_HAS_FLAGS) | |
799 | seq_puts(s, "NBD_FLAG_HAS_FLAGS\n"); | |
800 | if (flags & NBD_FLAG_READ_ONLY) | |
801 | seq_puts(s, "NBD_FLAG_READ_ONLY\n"); | |
802 | if (flags & NBD_FLAG_SEND_FLUSH) | |
803 | seq_puts(s, "NBD_FLAG_SEND_FLUSH\n"); | |
804 | if (flags & NBD_FLAG_SEND_TRIM) | |
805 | seq_puts(s, "NBD_FLAG_SEND_TRIM\n"); | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
810 | static int nbd_dbg_flags_open(struct inode *inode, struct file *file) | |
811 | { | |
812 | return single_open(file, nbd_dbg_flags_show, inode->i_private); | |
813 | } | |
814 | ||
815 | static const struct file_operations nbd_dbg_flags_ops = { | |
816 | .open = nbd_dbg_flags_open, | |
817 | .read = seq_read, | |
818 | .llseek = seq_lseek, | |
819 | .release = single_release, | |
820 | }; | |
821 | ||
822 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
823 | { | |
824 | struct dentry *dir; | |
27ea43fe MP |
825 | |
826 | if (!nbd_dbg_dir) | |
827 | return -EIO; | |
30d53d9c MP |
828 | |
829 | dir = debugfs_create_dir(nbd_name(nbd), nbd_dbg_dir); | |
27ea43fe MP |
830 | if (!dir) { |
831 | dev_err(nbd_to_dev(nbd), "Failed to create debugfs dir for '%s'\n", | |
832 | nbd_name(nbd)); | |
833 | return -EIO; | |
30d53d9c MP |
834 | } |
835 | nbd->dbg_dir = dir; | |
836 | ||
27ea43fe MP |
837 | debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_ops); |
838 | debugfs_create_u64("size_bytes", 0444, dir, &nbd->bytesize); | |
839 | debugfs_create_u32("timeout", 0444, dir, &nbd->xmit_timeout); | |
840 | debugfs_create_u32("blocksize", 0444, dir, &nbd->blksize); | |
d366a0ff | 841 | debugfs_create_file("flags", 0444, dir, nbd, &nbd_dbg_flags_ops); |
30d53d9c MP |
842 | |
843 | return 0; | |
844 | } | |
845 | ||
846 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
847 | { | |
848 | debugfs_remove_recursive(nbd->dbg_dir); | |
849 | } | |
850 | ||
851 | static int nbd_dbg_init(void) | |
852 | { | |
853 | struct dentry *dbg_dir; | |
854 | ||
855 | dbg_dir = debugfs_create_dir("nbd", NULL); | |
27ea43fe MP |
856 | if (!dbg_dir) |
857 | return -EIO; | |
30d53d9c MP |
858 | |
859 | nbd_dbg_dir = dbg_dir; | |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
864 | static void nbd_dbg_close(void) | |
865 | { | |
866 | debugfs_remove_recursive(nbd_dbg_dir); | |
867 | } | |
868 | ||
869 | #else /* IS_ENABLED(CONFIG_DEBUG_FS) */ | |
870 | ||
871 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
872 | { | |
873 | return 0; | |
874 | } | |
875 | ||
876 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
877 | { | |
878 | } | |
879 | ||
880 | static int nbd_dbg_init(void) | |
881 | { | |
882 | return 0; | |
883 | } | |
884 | ||
885 | static void nbd_dbg_close(void) | |
886 | { | |
887 | } | |
888 | ||
889 | #endif | |
890 | ||
fd8383fd JB |
891 | static int nbd_init_request(void *data, struct request *rq, |
892 | unsigned int hctx_idx, unsigned int request_idx, | |
893 | unsigned int numa_node) | |
894 | { | |
895 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
896 | ||
897 | cmd->nbd = data; | |
898 | INIT_LIST_HEAD(&cmd->list); | |
899 | return 0; | |
900 | } | |
901 | ||
902 | static struct blk_mq_ops nbd_mq_ops = { | |
903 | .queue_rq = nbd_queue_rq, | |
904 | .map_queue = blk_mq_map_queue, | |
905 | .init_request = nbd_init_request, | |
906 | }; | |
907 | ||
1da177e4 LT |
908 | /* |
909 | * And here should be modules and kernel interface | |
910 | * (Just smiley confuses emacs :-) | |
911 | */ | |
912 | ||
913 | static int __init nbd_init(void) | |
914 | { | |
915 | int err = -ENOMEM; | |
916 | int i; | |
d71a6d73 | 917 | int part_shift; |
1da177e4 | 918 | |
5b7b18cc | 919 | BUILD_BUG_ON(sizeof(struct nbd_request) != 28); |
1da177e4 | 920 | |
d71a6d73 | 921 | if (max_part < 0) { |
7742ce4a | 922 | printk(KERN_ERR "nbd: max_part must be >= 0\n"); |
d71a6d73 LV |
923 | return -EINVAL; |
924 | } | |
925 | ||
926 | part_shift = 0; | |
5988ce23 | 927 | if (max_part > 0) { |
d71a6d73 LV |
928 | part_shift = fls(max_part); |
929 | ||
5988ce23 NK |
930 | /* |
931 | * Adjust max_part according to part_shift as it is exported | |
932 | * to user space so that user can know the max number of | |
933 | * partition kernel should be able to manage. | |
934 | * | |
935 | * Note that -1 is required because partition 0 is reserved | |
936 | * for the whole disk. | |
937 | */ | |
938 | max_part = (1UL << part_shift) - 1; | |
939 | } | |
940 | ||
3b271082 NK |
941 | if ((1UL << part_shift) > DISK_MAX_PARTS) |
942 | return -EINVAL; | |
943 | ||
944 | if (nbds_max > 1UL << (MINORBITS - part_shift)) | |
945 | return -EINVAL; | |
946 | ||
ff6b8090 SM |
947 | nbd_dev = kcalloc(nbds_max, sizeof(*nbd_dev), GFP_KERNEL); |
948 | if (!nbd_dev) | |
949 | return -ENOMEM; | |
950 | ||
40be0c28 | 951 | for (i = 0; i < nbds_max; i++) { |
d71a6d73 | 952 | struct gendisk *disk = alloc_disk(1 << part_shift); |
1da177e4 LT |
953 | if (!disk) |
954 | goto out; | |
955 | nbd_dev[i].disk = disk; | |
fd8383fd JB |
956 | |
957 | nbd_dev[i].tag_set.ops = &nbd_mq_ops; | |
958 | nbd_dev[i].tag_set.nr_hw_queues = 1; | |
959 | nbd_dev[i].tag_set.queue_depth = 128; | |
960 | nbd_dev[i].tag_set.numa_node = NUMA_NO_NODE; | |
961 | nbd_dev[i].tag_set.cmd_size = sizeof(struct nbd_cmd); | |
962 | nbd_dev[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE | | |
963 | BLK_MQ_F_SG_MERGE; | |
964 | nbd_dev[i].tag_set.driver_data = &nbd_dev[i]; | |
965 | ||
966 | err = blk_mq_alloc_tag_set(&nbd_dev[i].tag_set); | |
967 | if (err) { | |
968 | put_disk(disk); | |
969 | goto out; | |
970 | } | |
971 | ||
1da177e4 LT |
972 | /* |
973 | * The new linux 2.5 block layer implementation requires | |
974 | * every gendisk to have its very own request_queue struct. | |
975 | * These structs are big so we dynamically allocate them. | |
976 | */ | |
fd8383fd | 977 | disk->queue = blk_mq_init_queue(&nbd_dev[i].tag_set); |
1da177e4 | 978 | if (!disk->queue) { |
fd8383fd | 979 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
1da177e4 LT |
980 | put_disk(disk); |
981 | goto out; | |
982 | } | |
fd8383fd | 983 | |
31dcfab0 JA |
984 | /* |
985 | * Tell the block layer that we are not a rotational device | |
986 | */ | |
987 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, disk->queue); | |
b277da0a | 988 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, disk->queue); |
a336d298 | 989 | disk->queue->limits.discard_granularity = 512; |
2bb4cd5c | 990 | blk_queue_max_discard_sectors(disk->queue, UINT_MAX); |
a336d298 | 991 | disk->queue->limits.discard_zeroes_data = 0; |
078be02b MB |
992 | blk_queue_max_hw_sectors(disk->queue, 65536); |
993 | disk->queue->limits.max_sectors = 256; | |
1da177e4 LT |
994 | } |
995 | ||
996 | if (register_blkdev(NBD_MAJOR, "nbd")) { | |
997 | err = -EIO; | |
998 | goto out; | |
999 | } | |
1000 | ||
1001 | printk(KERN_INFO "nbd: registered device at major %d\n", NBD_MAJOR); | |
1da177e4 | 1002 | |
30d53d9c MP |
1003 | nbd_dbg_init(); |
1004 | ||
40be0c28 | 1005 | for (i = 0; i < nbds_max; i++) { |
1da177e4 | 1006 | struct gendisk *disk = nbd_dev[i].disk; |
f4507164 | 1007 | nbd_dev[i].magic = NBD_MAGIC; |
23272a67 | 1008 | spin_lock_init(&nbd_dev[i].sock_lock); |
82d4dc5a | 1009 | mutex_init(&nbd_dev[i].tx_lock); |
7e2893a1 MP |
1010 | init_timer(&nbd_dev[i].timeout_timer); |
1011 | nbd_dev[i].timeout_timer.function = nbd_xmit_timeout; | |
1012 | nbd_dev[i].timeout_timer.data = (unsigned long)&nbd_dev[i]; | |
fd8383fd | 1013 | atomic_set(&nbd_dev[i].outstanding_cmds, 0); |
1da177e4 | 1014 | disk->major = NBD_MAJOR; |
d71a6d73 | 1015 | disk->first_minor = i << part_shift; |
1da177e4 LT |
1016 | disk->fops = &nbd_fops; |
1017 | disk->private_data = &nbd_dev[i]; | |
1da177e4 | 1018 | sprintf(disk->disk_name, "nbd%d", i); |
0e4f0f6f | 1019 | nbd_reset(&nbd_dev[i]); |
1da177e4 LT |
1020 | add_disk(disk); |
1021 | } | |
1022 | ||
1023 | return 0; | |
1024 | out: | |
1025 | while (i--) { | |
fd8383fd | 1026 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
1da177e4 LT |
1027 | blk_cleanup_queue(nbd_dev[i].disk->queue); |
1028 | put_disk(nbd_dev[i].disk); | |
1029 | } | |
f3944d61 | 1030 | kfree(nbd_dev); |
1da177e4 LT |
1031 | return err; |
1032 | } | |
1033 | ||
1034 | static void __exit nbd_cleanup(void) | |
1035 | { | |
1036 | int i; | |
30d53d9c MP |
1037 | |
1038 | nbd_dbg_close(); | |
1039 | ||
40be0c28 | 1040 | for (i = 0; i < nbds_max; i++) { |
1da177e4 | 1041 | struct gendisk *disk = nbd_dev[i].disk; |
40be0c28 | 1042 | nbd_dev[i].magic = 0; |
1da177e4 LT |
1043 | if (disk) { |
1044 | del_gendisk(disk); | |
1045 | blk_cleanup_queue(disk->queue); | |
fd8383fd | 1046 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
1da177e4 LT |
1047 | put_disk(disk); |
1048 | } | |
1049 | } | |
1da177e4 | 1050 | unregister_blkdev(NBD_MAJOR, "nbd"); |
f3944d61 | 1051 | kfree(nbd_dev); |
1da177e4 LT |
1052 | printk(KERN_INFO "nbd: unregistered device at major %d\n", NBD_MAJOR); |
1053 | } | |
1054 | ||
1055 | module_init(nbd_init); | |
1056 | module_exit(nbd_cleanup); | |
1057 | ||
1058 | MODULE_DESCRIPTION("Network Block Device"); | |
1059 | MODULE_LICENSE("GPL"); | |
1060 | ||
40be0c28 | 1061 | module_param(nbds_max, int, 0444); |
d71a6d73 LV |
1062 | MODULE_PARM_DESC(nbds_max, "number of network block devices to initialize (default: 16)"); |
1063 | module_param(max_part, int, 0444); | |
1064 | MODULE_PARM_DESC(max_part, "number of partitions per device (default: 0)"); |