Commit | Line | Data |
---|---|---|
eb1fe3bf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Network block device - make block devices work over TCP | |
4 | * | |
5 | * Note that you can not swap over this thing, yet. Seems to work but | |
6 | * deadlocks sometimes - you can not swap over TCP in general. | |
7 | * | |
a2531293 | 8 | * Copyright 1997-2000, 2008 Pavel Machek <pavel@ucw.cz> |
1da177e4 LT |
9 | * Parts copyright 2001 Steven Whitehouse <steve@chygwyn.com> |
10 | * | |
dbf492d6 | 11 | * (part of code stolen from loop.c) |
1da177e4 LT |
12 | */ |
13 | ||
bc9da6dd YK |
14 | #define pr_fmt(fmt) "nbd: " fmt |
15 | ||
1da177e4 LT |
16 | #include <linux/major.h> |
17 | ||
18 | #include <linux/blkdev.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/sched.h> | |
f1083048 | 22 | #include <linux/sched/mm.h> |
1da177e4 LT |
23 | #include <linux/fs.h> |
24 | #include <linux/bio.h> | |
25 | #include <linux/stat.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/file.h> | |
28 | #include <linux/ioctl.h> | |
2a48fc0a | 29 | #include <linux/mutex.h> |
4b2f0260 | 30 | #include <linux/compiler.h> |
8454d685 | 31 | #include <linux/completion.h> |
4b2f0260 HX |
32 | #include <linux/err.h> |
33 | #include <linux/kernel.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 | 35 | #include <net/sock.h> |
91cf45f0 | 36 | #include <linux/net.h> |
48cf6061 | 37 | #include <linux/kthread.h> |
b9c495bb | 38 | #include <linux/types.h> |
30d53d9c | 39 | #include <linux/debugfs.h> |
fd8383fd | 40 | #include <linux/blk-mq.h> |
1da177e4 | 41 | |
7c0f6ba6 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
43 | #include <asm/types.h> |
44 | ||
45 | #include <linux/nbd.h> | |
e46c7287 JB |
46 | #include <linux/nbd-netlink.h> |
47 | #include <net/genetlink.h> | |
1da177e4 | 48 | |
ea106722 MM |
49 | #define CREATE_TRACE_POINTS |
50 | #include <trace/events/nbd.h> | |
51 | ||
b0d9111a JB |
52 | static DEFINE_IDR(nbd_index_idr); |
53 | static DEFINE_MUTEX(nbd_index_mutex); | |
68c9417b | 54 | static struct workqueue_struct *nbd_del_wq; |
47d902b9 | 55 | static int nbd_total_devices = 0; |
b0d9111a | 56 | |
9561a7ad JB |
57 | struct nbd_sock { |
58 | struct socket *sock; | |
59 | struct mutex tx_lock; | |
9dd5d3ab JB |
60 | struct request *pending; |
61 | int sent; | |
f3733247 JB |
62 | bool dead; |
63 | int fallback_index; | |
799f9a38 | 64 | int cookie; |
9561a7ad JB |
65 | }; |
66 | ||
5ea8d108 JB |
67 | struct recv_thread_args { |
68 | struct work_struct work; | |
69 | struct nbd_device *nbd; | |
70 | int index; | |
71 | }; | |
72 | ||
799f9a38 JB |
73 | struct link_dead_args { |
74 | struct work_struct work; | |
75 | int index; | |
76 | }; | |
77 | ||
ec76a7b9 XL |
78 | #define NBD_RT_TIMEDOUT 0 |
79 | #define NBD_RT_DISCONNECT_REQUESTED 1 | |
80 | #define NBD_RT_DISCONNECTED 2 | |
81 | #define NBD_RT_HAS_PID_FILE 3 | |
82 | #define NBD_RT_HAS_CONFIG_REF 4 | |
83 | #define NBD_RT_BOUND 5 | |
c9a2f90f | 84 | #define NBD_RT_DISCONNECT_ON_CLOSE 6 |
6497ef8d | 85 | #define NBD_RT_HAS_BACKEND_FILE 7 |
9b4a6ba9 | 86 | |
8454d685 XL |
87 | #define NBD_DESTROY_ON_DISCONNECT 0 |
88 | #define NBD_DISCONNECT_REQUESTED 1 | |
89 | ||
5ea8d108 | 90 | struct nbd_config { |
22d109c1 | 91 | u32 flags; |
9b4a6ba9 | 92 | unsigned long runtime_flags; |
560bc4b3 | 93 | u64 dead_conn_timeout; |
13e71d69 | 94 | |
5ea8d108 | 95 | struct nbd_sock **socks; |
9561a7ad | 96 | int num_connections; |
560bc4b3 JB |
97 | atomic_t live_connections; |
98 | wait_queue_head_t conn_wait; | |
5ea8d108 | 99 | |
9561a7ad JB |
100 | atomic_t recv_threads; |
101 | wait_queue_head_t recv_wq; | |
41e76c6a | 102 | unsigned int blksize_bits; |
b9c495bb | 103 | loff_t bytesize; |
30d53d9c MP |
104 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
105 | struct dentry *dbg_dir; | |
106 | #endif | |
13e71d69 MP |
107 | }; |
108 | ||
41e76c6a ND |
109 | static inline unsigned int nbd_blksize(struct nbd_config *config) |
110 | { | |
111 | return 1u << config->blksize_bits; | |
112 | } | |
113 | ||
5ea8d108 JB |
114 | struct nbd_device { |
115 | struct blk_mq_tag_set tag_set; | |
116 | ||
e46c7287 | 117 | int index; |
5ea8d108 | 118 | refcount_t config_refs; |
c6a4759e | 119 | refcount_t refs; |
5ea8d108 JB |
120 | struct nbd_config *config; |
121 | struct mutex config_lock; | |
122 | struct gendisk *disk; | |
e9e006f5 | 123 | struct workqueue_struct *recv_workq; |
68c9417b | 124 | struct work_struct remove_work; |
5ea8d108 | 125 | |
c6a4759e | 126 | struct list_head list; |
5ea8d108 | 127 | struct task_struct *task_setup; |
8454d685 | 128 | |
8454d685 | 129 | unsigned long flags; |
0c98057b | 130 | pid_t pid; /* pid of nbd-client, if attached */ |
6497ef8d PKK |
131 | |
132 | char *backend; | |
5ea8d108 JB |
133 | }; |
134 | ||
d7d94d48 | 135 | #define NBD_CMD_REQUEUED 1 |
4e6eef5d YK |
136 | /* |
137 | * This flag will be set if nbd_queue_rq() succeed, and will be checked and | |
138 | * cleared in completion. Both setting and clearing of the flag are protected | |
139 | * by cmd->lock. | |
140 | */ | |
141 | #define NBD_CMD_INFLIGHT 2 | |
d7d94d48 | 142 | |
fd8383fd JB |
143 | struct nbd_cmd { |
144 | struct nbd_device *nbd; | |
8f3ea359 | 145 | struct mutex lock; |
f3733247 | 146 | int index; |
799f9a38 | 147 | int cookie; |
2da22da5 | 148 | int retries; |
2a842aca | 149 | blk_status_t status; |
d7d94d48 | 150 | unsigned long flags; |
8f3ea359 | 151 | u32 cmd_cookie; |
fd8383fd JB |
152 | }; |
153 | ||
30d53d9c MP |
154 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
155 | static struct dentry *nbd_dbg_dir; | |
156 | #endif | |
157 | ||
158 | #define nbd_name(nbd) ((nbd)->disk->disk_name) | |
159 | ||
41e76c6a | 160 | #define NBD_DEF_BLKSIZE_BITS 10 |
553768d1 | 161 | |
9c7a4169 | 162 | static unsigned int nbds_max = 16; |
7a8362a0 | 163 | static int max_part = 16; |
b0d9111a | 164 | static int part_shift; |
1da177e4 | 165 | |
9442b739 JB |
166 | static int nbd_dev_dbg_init(struct nbd_device *nbd); |
167 | static void nbd_dev_dbg_close(struct nbd_device *nbd); | |
5ea8d108 | 168 | static void nbd_config_put(struct nbd_device *nbd); |
e46c7287 | 169 | static void nbd_connect_reply(struct genl_info *info, int index); |
47d902b9 | 170 | static int nbd_genl_status(struct sk_buff *skb, struct genl_info *info); |
799f9a38 | 171 | static void nbd_dead_link_work(struct work_struct *work); |
08ba91ee | 172 | static void nbd_disconnect_and_put(struct nbd_device *nbd); |
9442b739 | 173 | |
d18509f5 | 174 | static inline struct device *nbd_to_dev(struct nbd_device *nbd) |
1da177e4 | 175 | { |
d18509f5 | 176 | return disk_to_dev(nbd->disk); |
1da177e4 LT |
177 | } |
178 | ||
d7d94d48 JB |
179 | static void nbd_requeue_cmd(struct nbd_cmd *cmd) |
180 | { | |
181 | struct request *req = blk_mq_rq_from_pdu(cmd); | |
182 | ||
183 | if (!test_and_set_bit(NBD_CMD_REQUEUED, &cmd->flags)) | |
184 | blk_mq_requeue_request(req, true); | |
185 | } | |
186 | ||
8f3ea359 JB |
187 | #define NBD_COOKIE_BITS 32 |
188 | ||
189 | static u64 nbd_cmd_handle(struct nbd_cmd *cmd) | |
190 | { | |
191 | struct request *req = blk_mq_rq_from_pdu(cmd); | |
192 | u32 tag = blk_mq_unique_tag(req); | |
193 | u64 cookie = cmd->cmd_cookie; | |
194 | ||
195 | return (cookie << NBD_COOKIE_BITS) | tag; | |
196 | } | |
197 | ||
198 | static u32 nbd_handle_to_tag(u64 handle) | |
199 | { | |
200 | return (u32)handle; | |
201 | } | |
202 | ||
203 | static u32 nbd_handle_to_cookie(u64 handle) | |
204 | { | |
205 | return (u32)(handle >> NBD_COOKIE_BITS); | |
206 | } | |
207 | ||
1da177e4 LT |
208 | static const char *nbdcmd_to_ascii(int cmd) |
209 | { | |
210 | switch (cmd) { | |
211 | case NBD_CMD_READ: return "read"; | |
212 | case NBD_CMD_WRITE: return "write"; | |
213 | case NBD_CMD_DISC: return "disconnect"; | |
75f187ab | 214 | case NBD_CMD_FLUSH: return "flush"; |
a336d298 | 215 | case NBD_CMD_TRIM: return "trim/discard"; |
1da177e4 LT |
216 | } |
217 | return "invalid"; | |
218 | } | |
1da177e4 | 219 | |
5ea8d108 JB |
220 | static ssize_t pid_show(struct device *dev, |
221 | struct device_attribute *attr, char *buf) | |
222 | { | |
223 | struct gendisk *disk = dev_to_disk(dev); | |
224 | struct nbd_device *nbd = (struct nbd_device *)disk->private_data; | |
225 | ||
0c98057b | 226 | return sprintf(buf, "%d\n", nbd->pid); |
5ea8d108 JB |
227 | } |
228 | ||
dfbde552 | 229 | static const struct device_attribute pid_attr = { |
5657a819 | 230 | .attr = { .name = "pid", .mode = 0444}, |
5ea8d108 JB |
231 | .show = pid_show, |
232 | }; | |
233 | ||
6497ef8d PKK |
234 | static ssize_t backend_show(struct device *dev, |
235 | struct device_attribute *attr, char *buf) | |
236 | { | |
237 | struct gendisk *disk = dev_to_disk(dev); | |
238 | struct nbd_device *nbd = (struct nbd_device *)disk->private_data; | |
239 | ||
240 | return sprintf(buf, "%s\n", nbd->backend ?: ""); | |
241 | } | |
242 | ||
243 | static const struct device_attribute backend_attr = { | |
244 | .attr = { .name = "backend", .mode = 0444}, | |
245 | .show = backend_show, | |
246 | }; | |
247 | ||
c6a4759e JB |
248 | static void nbd_dev_remove(struct nbd_device *nbd) |
249 | { | |
250 | struct gendisk *disk = nbd->disk; | |
8364da47 | 251 | |
327b501b | 252 | del_gendisk(disk); |
8b9ab626 | 253 | put_disk(disk); |
327b501b | 254 | blk_mq_free_tag_set(&nbd->tag_set); |
8454d685 XL |
255 | |
256 | /* | |
3f74e064 CH |
257 | * Remove from idr after del_gendisk() completes, so if the same ID is |
258 | * reused, the following add_disk() will succeed. | |
8454d685 | 259 | */ |
3f74e064 | 260 | mutex_lock(&nbd_index_mutex); |
68c9417b | 261 | idr_remove(&nbd_index_idr, nbd->index); |
68c9417b | 262 | mutex_unlock(&nbd_index_mutex); |
e2daec48 | 263 | destroy_workqueue(nbd->recv_workq); |
c6a4759e JB |
264 | kfree(nbd); |
265 | } | |
266 | ||
3f74e064 | 267 | static void nbd_dev_remove_work(struct work_struct *work) |
68c9417b | 268 | { |
3f74e064 | 269 | nbd_dev_remove(container_of(work, struct nbd_device, remove_work)); |
68c9417b HT |
270 | } |
271 | ||
c6a4759e JB |
272 | static void nbd_put(struct nbd_device *nbd) |
273 | { | |
3f74e064 CH |
274 | if (!refcount_dec_and_test(&nbd->refs)) |
275 | return; | |
276 | ||
277 | /* Call del_gendisk() asynchrounously to prevent deadlock */ | |
278 | if (test_bit(NBD_DESTROY_ON_DISCONNECT, &nbd->flags)) | |
279 | queue_work(nbd_del_wq, &nbd->remove_work); | |
280 | else | |
c6a4759e | 281 | nbd_dev_remove(nbd); |
c6a4759e JB |
282 | } |
283 | ||
799f9a38 JB |
284 | static int nbd_disconnected(struct nbd_config *config) |
285 | { | |
ec76a7b9 XL |
286 | return test_bit(NBD_RT_DISCONNECTED, &config->runtime_flags) || |
287 | test_bit(NBD_RT_DISCONNECT_REQUESTED, &config->runtime_flags); | |
799f9a38 JB |
288 | } |
289 | ||
290 | static void nbd_mark_nsock_dead(struct nbd_device *nbd, struct nbd_sock *nsock, | |
291 | int notify) | |
f3733247 | 292 | { |
799f9a38 JB |
293 | if (!nsock->dead && notify && !nbd_disconnected(nbd->config)) { |
294 | struct link_dead_args *args; | |
295 | args = kmalloc(sizeof(struct link_dead_args), GFP_NOIO); | |
296 | if (args) { | |
297 | INIT_WORK(&args->work, nbd_dead_link_work); | |
298 | args->index = nbd->index; | |
299 | queue_work(system_wq, &args->work); | |
300 | } | |
301 | } | |
560bc4b3 | 302 | if (!nsock->dead) { |
f3733247 | 303 | kernel_sock_shutdown(nsock->sock, SHUT_RDWR); |
5e3c3a7e | 304 | if (atomic_dec_return(&nbd->config->live_connections) == 0) { |
ec76a7b9 | 305 | if (test_and_clear_bit(NBD_RT_DISCONNECT_REQUESTED, |
5e3c3a7e | 306 | &nbd->config->runtime_flags)) { |
ec76a7b9 | 307 | set_bit(NBD_RT_DISCONNECTED, |
5e3c3a7e KV |
308 | &nbd->config->runtime_flags); |
309 | dev_info(nbd_to_dev(nbd), | |
310 | "Disconnected due to user request.\n"); | |
311 | } | |
312 | } | |
560bc4b3 | 313 | } |
f3733247 JB |
314 | nsock->dead = true; |
315 | nsock->pending = NULL; | |
316 | nsock->sent = 0; | |
317 | } | |
318 | ||
dcbddf54 | 319 | static int nbd_set_size(struct nbd_device *nbd, loff_t bytesize, |
2dc691cc | 320 | loff_t blksize) |
37091fdd | 321 | { |
dcbddf54 | 322 | if (!blksize) |
41e76c6a | 323 | blksize = 1u << NBD_DEF_BLKSIZE_BITS; |
c4318d6c XY |
324 | |
325 | if (blk_validate_block_size(blksize)) | |
dcbddf54 CH |
326 | return -EINVAL; |
327 | ||
2dc691cc | 328 | nbd->config->bytesize = bytesize; |
41e76c6a | 329 | nbd->config->blksize_bits = __ffs(blksize); |
2dc691cc | 330 | |
0c98057b | 331 | if (!nbd->pid) |
dcbddf54 | 332 | return 0; |
9e2b1967 | 333 | |
2dc691cc CH |
334 | if (nbd->config->flags & NBD_FLAG_SEND_TRIM) { |
335 | nbd->disk->queue->limits.discard_granularity = blksize; | |
6df133a1 JB |
336 | blk_queue_max_discard_sectors(nbd->disk->queue, UINT_MAX); |
337 | } | |
2dc691cc CH |
338 | blk_queue_logical_block_size(nbd->disk->queue, blksize); |
339 | blk_queue_physical_block_size(nbd->disk->queue, blksize); | |
92f93c3a | 340 | |
1aba169e JT |
341 | if (max_part) |
342 | set_bit(GD_NEED_PART_SCAN, &nbd->disk->state); | |
2ebcabf3 CH |
343 | if (!set_capacity_and_notify(nbd->disk, bytesize >> 9)) |
344 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); | |
dcbddf54 | 345 | return 0; |
37091fdd MP |
346 | } |
347 | ||
1e388ae0 | 348 | static void nbd_complete_rq(struct request *req) |
1da177e4 | 349 | { |
1e388ae0 | 350 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req); |
1da177e4 | 351 | |
ee57a05c | 352 | dev_dbg(nbd_to_dev(cmd->nbd), "request %p: %s\n", req, |
1e388ae0 | 353 | cmd->status ? "failed" : "done"); |
1da177e4 | 354 | |
1e388ae0 | 355 | blk_mq_end_request(req, cmd->status); |
1da177e4 LT |
356 | } |
357 | ||
e018e757 MP |
358 | /* |
359 | * Forcibly shutdown the socket causing all listeners to error | |
360 | */ | |
36e47bee | 361 | static void sock_shutdown(struct nbd_device *nbd) |
7fdfd406 | 362 | { |
5ea8d108 | 363 | struct nbd_config *config = nbd->config; |
9561a7ad | 364 | int i; |
23272a67 | 365 | |
5ea8d108 | 366 | if (config->num_connections == 0) |
9561a7ad | 367 | return; |
ec76a7b9 | 368 | if (test_and_set_bit(NBD_RT_DISCONNECTED, &config->runtime_flags)) |
260bbce4 | 369 | return; |
23272a67 | 370 | |
5ea8d108 JB |
371 | for (i = 0; i < config->num_connections; i++) { |
372 | struct nbd_sock *nsock = config->socks[i]; | |
9561a7ad | 373 | mutex_lock(&nsock->tx_lock); |
799f9a38 | 374 | nbd_mark_nsock_dead(nbd, nsock, 0); |
9561a7ad JB |
375 | mutex_unlock(&nsock->tx_lock); |
376 | } | |
377 | dev_warn(disk_to_dev(nbd->disk), "shutting down sockets\n"); | |
7fdfd406 PC |
378 | } |
379 | ||
00514677 MC |
380 | static u32 req_to_nbd_cmd_type(struct request *req) |
381 | { | |
382 | switch (req_op(req)) { | |
383 | case REQ_OP_DISCARD: | |
384 | return NBD_CMD_TRIM; | |
385 | case REQ_OP_FLUSH: | |
386 | return NBD_CMD_FLUSH; | |
387 | case REQ_OP_WRITE: | |
388 | return NBD_CMD_WRITE; | |
389 | case REQ_OP_READ: | |
390 | return NBD_CMD_READ; | |
391 | default: | |
392 | return U32_MAX; | |
393 | } | |
394 | } | |
395 | ||
9bdb4833 | 396 | static enum blk_eh_timer_return nbd_xmit_timeout(struct request *req) |
7fdfd406 | 397 | { |
0eadf37a JB |
398 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req); |
399 | struct nbd_device *nbd = cmd->nbd; | |
5ea8d108 JB |
400 | struct nbd_config *config; |
401 | ||
de6346ec JB |
402 | if (!mutex_trylock(&cmd->lock)) |
403 | return BLK_EH_RESET_TIMER; | |
404 | ||
2895f183 | 405 | if (!test_bit(NBD_CMD_INFLIGHT, &cmd->flags)) { |
07175cb1 YK |
406 | mutex_unlock(&cmd->lock); |
407 | return BLK_EH_DONE; | |
408 | } | |
409 | ||
5ea8d108 | 410 | if (!refcount_inc_not_zero(&nbd->config_refs)) { |
2a842aca | 411 | cmd->status = BLK_STS_TIMEOUT; |
2895f183 | 412 | __clear_bit(NBD_CMD_INFLIGHT, &cmd->flags); |
de6346ec | 413 | mutex_unlock(&cmd->lock); |
e5eab017 | 414 | goto done; |
5ea8d108 | 415 | } |
5ea8d108 | 416 | config = nbd->config; |
dcc909d9 | 417 | |
d970958b HP |
418 | if (config->num_connections > 1 || |
419 | (config->num_connections == 1 && nbd->tag_set.timeout)) { | |
f3733247 | 420 | dev_err_ratelimited(nbd_to_dev(nbd), |
5e3c3a7e KV |
421 | "Connection timed out, retrying (%d/%d alive)\n", |
422 | atomic_read(&config->live_connections), | |
423 | config->num_connections); | |
f3733247 JB |
424 | /* |
425 | * Hooray we have more connections, requeue this IO, the submit | |
d970958b HP |
426 | * path will put it on a real connection. Or if only one |
427 | * connection is configured, the submit path will wait util | |
428 | * a new connection is reconfigured or util dead timeout. | |
f3733247 | 429 | */ |
d970958b | 430 | if (config->socks) { |
5ea8d108 | 431 | if (cmd->index < config->num_connections) { |
f3733247 | 432 | struct nbd_sock *nsock = |
5ea8d108 | 433 | config->socks[cmd->index]; |
f3733247 | 434 | mutex_lock(&nsock->tx_lock); |
799f9a38 JB |
435 | /* We can have multiple outstanding requests, so |
436 | * we don't want to mark the nsock dead if we've | |
437 | * already reconnected with a new socket, so | |
438 | * only mark it dead if its the same socket we | |
439 | * were sent out on. | |
440 | */ | |
441 | if (cmd->cookie == nsock->cookie) | |
442 | nbd_mark_nsock_dead(nbd, nsock, 1); | |
f3733247 JB |
443 | mutex_unlock(&nsock->tx_lock); |
444 | } | |
8f3ea359 | 445 | mutex_unlock(&cmd->lock); |
d7d94d48 | 446 | nbd_requeue_cmd(cmd); |
5ea8d108 | 447 | nbd_config_put(nbd); |
6600593c | 448 | return BLK_EH_DONE; |
f3733247 | 449 | } |
f3733247 | 450 | } |
2da22da5 MC |
451 | |
452 | if (!nbd->tag_set.timeout) { | |
453 | /* | |
454 | * Userspace sets timeout=0 to disable socket disconnection, | |
455 | * so just warn and reset the timer. | |
456 | */ | |
2c272542 | 457 | struct nbd_sock *nsock = config->socks[cmd->index]; |
2da22da5 MC |
458 | cmd->retries++; |
459 | dev_info(nbd_to_dev(nbd), "Possible stuck request %p: control (%s@%llu,%uB). Runtime %u seconds\n", | |
460 | req, nbdcmd_to_ascii(req_to_nbd_cmd_type(req)), | |
461 | (unsigned long long)blk_rq_pos(req) << 9, | |
462 | blk_rq_bytes(req), (req->timeout / HZ) * cmd->retries); | |
463 | ||
2c272542 HP |
464 | mutex_lock(&nsock->tx_lock); |
465 | if (cmd->cookie != nsock->cookie) { | |
466 | nbd_requeue_cmd(cmd); | |
467 | mutex_unlock(&nsock->tx_lock); | |
468 | mutex_unlock(&cmd->lock); | |
469 | nbd_config_put(nbd); | |
470 | return BLK_EH_DONE; | |
471 | } | |
472 | mutex_unlock(&nsock->tx_lock); | |
2da22da5 MC |
473 | mutex_unlock(&cmd->lock); |
474 | nbd_config_put(nbd); | |
475 | return BLK_EH_RESET_TIMER; | |
476 | } | |
477 | ||
478 | dev_err_ratelimited(nbd_to_dev(nbd), "Connection timed out\n"); | |
ec76a7b9 | 479 | set_bit(NBD_RT_TIMEDOUT, &config->runtime_flags); |
2a842aca | 480 | cmd->status = BLK_STS_IOERR; |
2895f183 | 481 | __clear_bit(NBD_CMD_INFLIGHT, &cmd->flags); |
8f3ea359 | 482 | mutex_unlock(&cmd->lock); |
9561a7ad | 483 | sock_shutdown(nbd); |
5ea8d108 | 484 | nbd_config_put(nbd); |
e5eab017 CH |
485 | done: |
486 | blk_mq_complete_request(req); | |
487 | return BLK_EH_DONE; | |
7fdfd406 PC |
488 | } |
489 | ||
1da177e4 | 490 | /* |
f52c0e08 YK |
491 | * Send or receive packet. Return a positive value on success and |
492 | * negtive value on failue, and never return 0. | |
1da177e4 | 493 | */ |
c9f2b6ae | 494 | static int sock_xmit(struct nbd_device *nbd, int index, int send, |
9dd5d3ab | 495 | struct iov_iter *iter, int msg_flags, int *sent) |
1da177e4 | 496 | { |
5ea8d108 JB |
497 | struct nbd_config *config = nbd->config; |
498 | struct socket *sock = config->socks[index]->sock; | |
1da177e4 LT |
499 | int result; |
500 | struct msghdr msg; | |
f1083048 | 501 | unsigned int noreclaim_flag; |
1da177e4 | 502 | |
ffc41cf8 | 503 | if (unlikely(!sock)) { |
a897b666 | 504 | dev_err_ratelimited(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
505 | "Attempted %s on closed socket in sock_xmit\n", |
506 | (send ? "send" : "recv")); | |
ffc41cf8 MS |
507 | return -EINVAL; |
508 | } | |
509 | ||
c9f2b6ae | 510 | msg.msg_iter = *iter; |
c1696cab | 511 | |
f1083048 | 512 | noreclaim_flag = memalloc_noreclaim_save(); |
1da177e4 | 513 | do { |
7f338fe4 | 514 | sock->sk->sk_allocation = GFP_NOIO | __GFP_MEMALLOC; |
1da177e4 LT |
515 | msg.msg_name = NULL; |
516 | msg.msg_namelen = 0; | |
517 | msg.msg_control = NULL; | |
518 | msg.msg_controllen = 0; | |
1da177e4 LT |
519 | msg.msg_flags = msg_flags | MSG_NOSIGNAL; |
520 | ||
7e2893a1 | 521 | if (send) |
c1696cab | 522 | result = sock_sendmsg(sock, &msg); |
7e2893a1 | 523 | else |
c1696cab | 524 | result = sock_recvmsg(sock, &msg, msg.msg_flags); |
1da177e4 | 525 | |
1da177e4 LT |
526 | if (result <= 0) { |
527 | if (result == 0) | |
528 | result = -EPIPE; /* short read */ | |
529 | break; | |
530 | } | |
9dd5d3ab JB |
531 | if (sent) |
532 | *sent += result; | |
c1696cab | 533 | } while (msg_data_left(&msg)); |
1da177e4 | 534 | |
f1083048 | 535 | memalloc_noreclaim_restore(noreclaim_flag); |
1da177e4 LT |
536 | |
537 | return result; | |
538 | } | |
539 | ||
32e67a3a JB |
540 | /* |
541 | * Different settings for sk->sk_sndtimeo can result in different return values | |
542 | * if there is a signal pending when we enter sendmsg, because reasons? | |
543 | */ | |
544 | static inline int was_interrupted(int result) | |
545 | { | |
546 | return result == -ERESTARTSYS || result == -EINTR; | |
547 | } | |
548 | ||
7fdfd406 | 549 | /* always call with the tx_lock held */ |
9561a7ad | 550 | static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index) |
1da177e4 | 551 | { |
fd8383fd | 552 | struct request *req = blk_mq_rq_from_pdu(cmd); |
5ea8d108 JB |
553 | struct nbd_config *config = nbd->config; |
554 | struct nbd_sock *nsock = config->socks[index]; | |
d61b7f97 | 555 | int result; |
c9f2b6ae AV |
556 | struct nbd_request request = {.magic = htonl(NBD_REQUEST_MAGIC)}; |
557 | struct kvec iov = {.iov_base = &request, .iov_len = sizeof(request)}; | |
558 | struct iov_iter from; | |
1011c1b9 | 559 | unsigned long size = blk_rq_bytes(req); |
429a787b | 560 | struct bio *bio; |
8f3ea359 | 561 | u64 handle; |
9dc6c806 | 562 | u32 type; |
685c9b24 | 563 | u32 nbd_cmd_flags = 0; |
9dd5d3ab | 564 | int sent = nsock->sent, skip = 0; |
9dc6c806 | 565 | |
de4eda9d | 566 | iov_iter_kvec(&from, ITER_SOURCE, &iov, 1, sizeof(request)); |
c9f2b6ae | 567 | |
00514677 MC |
568 | type = req_to_nbd_cmd_type(req); |
569 | if (type == U32_MAX) | |
aebf526b | 570 | return -EIO; |
1da177e4 | 571 | |
09fc54cc | 572 | if (rq_data_dir(req) == WRITE && |
5ea8d108 | 573 | (config->flags & NBD_FLAG_READ_ONLY)) { |
09fc54cc CH |
574 | dev_err_ratelimited(disk_to_dev(nbd->disk), |
575 | "Write on read-only\n"); | |
576 | return -EIO; | |
577 | } | |
578 | ||
685c9b24 SM |
579 | if (req->cmd_flags & REQ_FUA) |
580 | nbd_cmd_flags |= NBD_CMD_FLAG_FUA; | |
581 | ||
9dd5d3ab JB |
582 | /* We did a partial send previously, and we at least sent the whole |
583 | * request struct, so just go and send the rest of the pages in the | |
584 | * request. | |
585 | */ | |
586 | if (sent) { | |
587 | if (sent >= sizeof(request)) { | |
588 | skip = sent - sizeof(request); | |
2abd2de7 AH |
589 | |
590 | /* initialize handle for tracing purposes */ | |
591 | handle = nbd_cmd_handle(cmd); | |
592 | ||
9dd5d3ab JB |
593 | goto send_pages; |
594 | } | |
595 | iov_iter_advance(&from, sent); | |
8f3ea359 JB |
596 | } else { |
597 | cmd->cmd_cookie++; | |
9dd5d3ab | 598 | } |
f3733247 | 599 | cmd->index = index; |
799f9a38 | 600 | cmd->cookie = nsock->cookie; |
2da22da5 | 601 | cmd->retries = 0; |
685c9b24 | 602 | request.type = htonl(type | nbd_cmd_flags); |
9561a7ad | 603 | if (type != NBD_CMD_FLUSH) { |
75f187ab AB |
604 | request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9); |
605 | request.len = htonl(size); | |
606 | } | |
8f3ea359 JB |
607 | handle = nbd_cmd_handle(cmd); |
608 | memcpy(request.handle, &handle, sizeof(handle)); | |
1da177e4 | 609 | |
ea106722 MM |
610 | trace_nbd_send_request(&request, nbd->index, blk_mq_rq_from_pdu(cmd)); |
611 | ||
d18509f5 | 612 | dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n", |
ee57a05c | 613 | req, nbdcmd_to_ascii(type), |
d18509f5 | 614 | (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req)); |
c9f2b6ae | 615 | result = sock_xmit(nbd, index, 1, &from, |
9dd5d3ab | 616 | (type == NBD_CMD_WRITE) ? MSG_MORE : 0, &sent); |
2abd2de7 | 617 | trace_nbd_header_sent(req, handle); |
f52c0e08 | 618 | if (result < 0) { |
32e67a3a | 619 | if (was_interrupted(result)) { |
9dd5d3ab JB |
620 | /* If we havne't sent anything we can just return BUSY, |
621 | * however if we have sent something we need to make | |
622 | * sure we only allow this req to be sent until we are | |
623 | * completely done. | |
624 | */ | |
625 | if (sent) { | |
626 | nsock->pending = req; | |
627 | nsock->sent = sent; | |
628 | } | |
d7d94d48 | 629 | set_bit(NBD_CMD_REQUEUED, &cmd->flags); |
fc17b653 | 630 | return BLK_STS_RESOURCE; |
9dd5d3ab | 631 | } |
a897b666 | 632 | dev_err_ratelimited(disk_to_dev(nbd->disk), |
7f1b90f9 | 633 | "Send control failed (result %d)\n", result); |
f3733247 | 634 | return -EAGAIN; |
1da177e4 | 635 | } |
9dd5d3ab | 636 | send_pages: |
429a787b | 637 | if (type != NBD_CMD_WRITE) |
9dd5d3ab | 638 | goto out; |
429a787b | 639 | |
429a787b JA |
640 | bio = req->bio; |
641 | while (bio) { | |
642 | struct bio *next = bio->bi_next; | |
643 | struct bvec_iter iter; | |
7988613b | 644 | struct bio_vec bvec; |
429a787b JA |
645 | |
646 | bio_for_each_segment(bvec, bio, iter) { | |
647 | bool is_last = !next && bio_iter_last(bvec, iter); | |
d61b7f97 | 648 | int flags = is_last ? 0 : MSG_MORE; |
429a787b | 649 | |
d18509f5 | 650 | dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n", |
ee57a05c | 651 | req, bvec.bv_len); |
de4eda9d | 652 | iov_iter_bvec(&from, ITER_SOURCE, &bvec, 1, bvec.bv_len); |
9dd5d3ab JB |
653 | if (skip) { |
654 | if (skip >= iov_iter_count(&from)) { | |
655 | skip -= iov_iter_count(&from); | |
656 | continue; | |
657 | } | |
658 | iov_iter_advance(&from, skip); | |
659 | skip = 0; | |
660 | } | |
661 | result = sock_xmit(nbd, index, 1, &from, flags, &sent); | |
f52c0e08 | 662 | if (result < 0) { |
32e67a3a | 663 | if (was_interrupted(result)) { |
9dd5d3ab JB |
664 | /* We've already sent the header, we |
665 | * have no choice but to set pending and | |
666 | * return BUSY. | |
667 | */ | |
668 | nsock->pending = req; | |
669 | nsock->sent = sent; | |
d7d94d48 | 670 | set_bit(NBD_CMD_REQUEUED, &cmd->flags); |
fc17b653 | 671 | return BLK_STS_RESOURCE; |
9dd5d3ab | 672 | } |
f4507164 | 673 | dev_err(disk_to_dev(nbd->disk), |
7f1b90f9 WC |
674 | "Send data failed (result %d)\n", |
675 | result); | |
f3733247 | 676 | return -EAGAIN; |
6c92e699 | 677 | } |
429a787b JA |
678 | /* |
679 | * The completion might already have come in, | |
680 | * so break for the last one instead of letting | |
681 | * the iterator do it. This prevents use-after-free | |
682 | * of the bio. | |
683 | */ | |
684 | if (is_last) | |
685 | break; | |
1da177e4 | 686 | } |
429a787b | 687 | bio = next; |
1da177e4 | 688 | } |
9dd5d3ab | 689 | out: |
2abd2de7 | 690 | trace_nbd_payload_sent(req, handle); |
9dd5d3ab JB |
691 | nsock->pending = NULL; |
692 | nsock->sent = 0; | |
1da177e4 | 693 | return 0; |
1da177e4 LT |
694 | } |
695 | ||
3fe1db62 YK |
696 | static int nbd_read_reply(struct nbd_device *nbd, int index, |
697 | struct nbd_reply *reply) | |
1da177e4 | 698 | { |
3fe1db62 | 699 | struct kvec iov = {.iov_base = reply, .iov_len = sizeof(*reply)}; |
c9f2b6ae | 700 | struct iov_iter to; |
3fe1db62 | 701 | int result; |
1da177e4 | 702 | |
3fe1db62 | 703 | reply->magic = 0; |
de4eda9d | 704 | iov_iter_kvec(&to, ITER_DEST, &iov, 1, sizeof(*reply)); |
9dd5d3ab | 705 | result = sock_xmit(nbd, index, 0, &to, MSG_WAITALL, NULL); |
f52c0e08 | 706 | if (result < 0) { |
3fe1db62 | 707 | if (!nbd_disconnected(nbd->config)) |
9561a7ad JB |
708 | dev_err(disk_to_dev(nbd->disk), |
709 | "Receive control failed (result %d)\n", result); | |
3fe1db62 | 710 | return result; |
1da177e4 | 711 | } |
e4b57e08 | 712 | |
3fe1db62 | 713 | if (ntohl(reply->magic) != NBD_REPLY_MAGIC) { |
f4507164 | 714 | dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n", |
3fe1db62 YK |
715 | (unsigned long)ntohl(reply->magic)); |
716 | return -EPROTO; | |
e4b57e08 MF |
717 | } |
718 | ||
3fe1db62 YK |
719 | return 0; |
720 | } | |
721 | ||
722 | /* NULL returned = something went wrong, inform userspace */ | |
723 | static struct nbd_cmd *nbd_handle_reply(struct nbd_device *nbd, int index, | |
724 | struct nbd_reply *reply) | |
725 | { | |
726 | int result; | |
727 | struct nbd_cmd *cmd; | |
728 | struct request *req = NULL; | |
729 | u64 handle; | |
730 | u16 hwq; | |
731 | u32 tag; | |
732 | int ret = 0; | |
733 | ||
734 | memcpy(&handle, reply->handle, sizeof(handle)); | |
8f3ea359 | 735 | tag = nbd_handle_to_tag(handle); |
fd8383fd JB |
736 | hwq = blk_mq_unique_tag_to_hwq(tag); |
737 | if (hwq < nbd->tag_set.nr_hw_queues) | |
738 | req = blk_mq_tag_to_rq(nbd->tag_set.tags[hwq], | |
739 | blk_mq_unique_tag_to_tag(tag)); | |
740 | if (!req || !blk_mq_request_started(req)) { | |
741 | dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%d) %p\n", | |
742 | tag, req); | |
743 | return ERR_PTR(-ENOENT); | |
1da177e4 | 744 | } |
2abd2de7 | 745 | trace_nbd_header_received(req, handle); |
fd8383fd | 746 | cmd = blk_mq_rq_to_pdu(req); |
8f3ea359 JB |
747 | |
748 | mutex_lock(&cmd->lock); | |
2895f183 | 749 | if (!test_bit(NBD_CMD_INFLIGHT, &cmd->flags)) { |
4e6eef5d YK |
750 | dev_err(disk_to_dev(nbd->disk), "Suspicious reply %d (status %u flags %lu)", |
751 | tag, cmd->status, cmd->flags); | |
752 | ret = -ENOENT; | |
753 | goto out; | |
754 | } | |
fcf3d633 YK |
755 | if (cmd->index != index) { |
756 | dev_err(disk_to_dev(nbd->disk), "Unexpected reply %d from different sock %d (expected %d)", | |
757 | tag, index, cmd->index); | |
494dbee3 YK |
758 | ret = -ENOENT; |
759 | goto out; | |
fcf3d633 | 760 | } |
8f3ea359 JB |
761 | if (cmd->cmd_cookie != nbd_handle_to_cookie(handle)) { |
762 | dev_err(disk_to_dev(nbd->disk), "Double reply on req %p, cmd_cookie %u, handle cookie %u\n", | |
763 | req, cmd->cmd_cookie, nbd_handle_to_cookie(handle)); | |
764 | ret = -ENOENT; | |
765 | goto out; | |
766 | } | |
7ce23e8e JB |
767 | if (cmd->status != BLK_STS_OK) { |
768 | dev_err(disk_to_dev(nbd->disk), "Command already handled %p\n", | |
769 | req); | |
770 | ret = -ENOENT; | |
771 | goto out; | |
772 | } | |
8f3ea359 JB |
773 | if (test_bit(NBD_CMD_REQUEUED, &cmd->flags)) { |
774 | dev_err(disk_to_dev(nbd->disk), "Raced with timeout on req %p\n", | |
775 | req); | |
776 | ret = -ENOENT; | |
777 | goto out; | |
778 | } | |
3fe1db62 | 779 | if (ntohl(reply->error)) { |
f4507164 | 780 | dev_err(disk_to_dev(nbd->disk), "Other side returned error (%d)\n", |
3fe1db62 | 781 | ntohl(reply->error)); |
2a842aca | 782 | cmd->status = BLK_STS_IOERR; |
8f3ea359 | 783 | goto out; |
1da177e4 LT |
784 | } |
785 | ||
ee57a05c | 786 | dev_dbg(nbd_to_dev(nbd), "request %p: got reply\n", req); |
9dc6c806 | 787 | if (rq_data_dir(req) != WRITE) { |
5705f702 | 788 | struct req_iterator iter; |
7988613b | 789 | struct bio_vec bvec; |
3fe1db62 | 790 | struct iov_iter to; |
5705f702 N |
791 | |
792 | rq_for_each_segment(bvec, req, iter) { | |
de4eda9d | 793 | iov_iter_bvec(&to, ITER_DEST, &bvec, 1, bvec.bv_len); |
9dd5d3ab | 794 | result = sock_xmit(nbd, index, 0, &to, MSG_WAITALL, NULL); |
f52c0e08 | 795 | if (result < 0) { |
f4507164 | 796 | dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n", |
7f1b90f9 | 797 | result); |
f3733247 | 798 | /* |
d970958b | 799 | * If we've disconnected, we need to make sure we |
f3733247 JB |
800 | * complete this request, otherwise error out |
801 | * and let the timeout stuff handle resubmitting | |
802 | * this request onto another connection. | |
803 | */ | |
3fe1db62 | 804 | if (nbd_disconnected(nbd->config)) { |
2a842aca | 805 | cmd->status = BLK_STS_IOERR; |
8f3ea359 | 806 | goto out; |
f3733247 | 807 | } |
8f3ea359 JB |
808 | ret = -EIO; |
809 | goto out; | |
6c92e699 | 810 | } |
d18509f5 | 811 | dev_dbg(nbd_to_dev(nbd), "request %p: got %d bytes data\n", |
ee57a05c | 812 | req, bvec.bv_len); |
1da177e4 LT |
813 | } |
814 | } | |
8f3ea359 | 815 | out: |
2abd2de7 | 816 | trace_nbd_payload_received(req, handle); |
8f3ea359 JB |
817 | mutex_unlock(&cmd->lock); |
818 | return ret ? ERR_PTR(ret) : cmd; | |
1da177e4 LT |
819 | } |
820 | ||
9561a7ad | 821 | static void recv_work(struct work_struct *work) |
1da177e4 | 822 | { |
9561a7ad JB |
823 | struct recv_thread_args *args = container_of(work, |
824 | struct recv_thread_args, | |
825 | work); | |
826 | struct nbd_device *nbd = args->nbd; | |
5ea8d108 | 827 | struct nbd_config *config = nbd->config; |
8663b210 | 828 | struct request_queue *q = nbd->disk->queue; |
3fe1db62 | 829 | struct nbd_sock *nsock; |
fd8383fd | 830 | struct nbd_cmd *cmd; |
15f73f5b | 831 | struct request *rq; |
1da177e4 | 832 | |
19391830 | 833 | while (1) { |
3fe1db62 | 834 | struct nbd_reply reply; |
f3733247 | 835 | |
3fe1db62 YK |
836 | if (nbd_read_reply(nbd, args->index, &reply)) |
837 | break; | |
838 | ||
8663b210 YK |
839 | /* |
840 | * Grab .q_usage_counter so request pool won't go away, then no | |
841 | * request use-after-free is possible during nbd_handle_reply(). | |
842 | * If queue is frozen, there won't be any inflight requests, we | |
843 | * needn't to handle the incoming garbage message. | |
844 | */ | |
845 | if (!percpu_ref_tryget(&q->q_usage_counter)) { | |
846 | dev_err(disk_to_dev(nbd->disk), "%s: no io inflight\n", | |
847 | __func__); | |
848 | break; | |
849 | } | |
850 | ||
3fe1db62 | 851 | cmd = nbd_handle_reply(nbd, args->index, &reply); |
8663b210 YK |
852 | if (IS_ERR(cmd)) { |
853 | percpu_ref_put(&q->q_usage_counter); | |
19391830 MP |
854 | break; |
855 | } | |
856 | ||
15f73f5b | 857 | rq = blk_mq_rq_from_pdu(cmd); |
2895f183 YK |
858 | if (likely(!blk_should_fake_timeout(rq->q))) { |
859 | bool complete; | |
860 | ||
861 | mutex_lock(&cmd->lock); | |
862 | complete = __test_and_clear_bit(NBD_CMD_INFLIGHT, | |
863 | &cmd->flags); | |
864 | mutex_unlock(&cmd->lock); | |
865 | if (complete) | |
866 | blk_mq_complete_request(rq); | |
867 | } | |
8663b210 | 868 | percpu_ref_put(&q->q_usage_counter); |
19391830 | 869 | } |
3fe1db62 YK |
870 | |
871 | nsock = config->socks[args->index]; | |
872 | mutex_lock(&nsock->tx_lock); | |
873 | nbd_mark_nsock_dead(nbd, nsock, 1); | |
874 | mutex_unlock(&nsock->tx_lock); | |
875 | ||
87aac3a8 | 876 | nbd_config_put(nbd); |
5ea8d108 JB |
877 | atomic_dec(&config->recv_threads); |
878 | wake_up(&config->recv_wq); | |
5ea8d108 | 879 | kfree(args); |
1da177e4 LT |
880 | } |
881 | ||
2dd6532e | 882 | static bool nbd_clear_req(struct request *req, void *data) |
1da177e4 | 883 | { |
d250bf4e | 884 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req); |
1da177e4 | 885 | |
cddce011 XY |
886 | /* don't abort one completed request */ |
887 | if (blk_mq_request_completed(req)) | |
888 | return true; | |
889 | ||
de6346ec | 890 | mutex_lock(&cmd->lock); |
07175cb1 YK |
891 | if (!__test_and_clear_bit(NBD_CMD_INFLIGHT, &cmd->flags)) { |
892 | mutex_unlock(&cmd->lock); | |
893 | return true; | |
894 | } | |
2a842aca | 895 | cmd->status = BLK_STS_IOERR; |
de6346ec JB |
896 | mutex_unlock(&cmd->lock); |
897 | ||
08e0029a | 898 | blk_mq_complete_request(req); |
7baa8572 | 899 | return true; |
fd8383fd JB |
900 | } |
901 | ||
902 | static void nbd_clear_que(struct nbd_device *nbd) | |
903 | { | |
b52c2e92 | 904 | blk_mq_quiesce_queue(nbd->disk->queue); |
fd8383fd | 905 | blk_mq_tagset_busy_iter(&nbd->tag_set, nbd_clear_req, NULL); |
b52c2e92 | 906 | blk_mq_unquiesce_queue(nbd->disk->queue); |
e78273c8 | 907 | dev_dbg(disk_to_dev(nbd->disk), "queue cleared\n"); |
1da177e4 LT |
908 | } |
909 | ||
f3733247 JB |
910 | static int find_fallback(struct nbd_device *nbd, int index) |
911 | { | |
5ea8d108 | 912 | struct nbd_config *config = nbd->config; |
f3733247 | 913 | int new_index = -1; |
5ea8d108 | 914 | struct nbd_sock *nsock = config->socks[index]; |
f3733247 JB |
915 | int fallback = nsock->fallback_index; |
916 | ||
ec76a7b9 | 917 | if (test_bit(NBD_RT_DISCONNECTED, &config->runtime_flags)) |
f3733247 JB |
918 | return new_index; |
919 | ||
5ea8d108 | 920 | if (config->num_connections <= 1) { |
f3733247 | 921 | dev_err_ratelimited(disk_to_dev(nbd->disk), |
d970958b | 922 | "Dead connection, failed to find a fallback\n"); |
f3733247 JB |
923 | return new_index; |
924 | } | |
925 | ||
5ea8d108 JB |
926 | if (fallback >= 0 && fallback < config->num_connections && |
927 | !config->socks[fallback]->dead) | |
f3733247 JB |
928 | return fallback; |
929 | ||
930 | if (nsock->fallback_index < 0 || | |
5ea8d108 JB |
931 | nsock->fallback_index >= config->num_connections || |
932 | config->socks[nsock->fallback_index]->dead) { | |
f3733247 | 933 | int i; |
5ea8d108 | 934 | for (i = 0; i < config->num_connections; i++) { |
f3733247 JB |
935 | if (i == index) |
936 | continue; | |
5ea8d108 | 937 | if (!config->socks[i]->dead) { |
f3733247 JB |
938 | new_index = i; |
939 | break; | |
940 | } | |
941 | } | |
942 | nsock->fallback_index = new_index; | |
943 | if (new_index < 0) { | |
944 | dev_err_ratelimited(disk_to_dev(nbd->disk), | |
945 | "Dead connection, failed to find a fallback\n"); | |
946 | return new_index; | |
947 | } | |
948 | } | |
949 | new_index = nsock->fallback_index; | |
950 | return new_index; | |
951 | } | |
7fdfd406 | 952 | |
560bc4b3 JB |
953 | static int wait_for_reconnect(struct nbd_device *nbd) |
954 | { | |
955 | struct nbd_config *config = nbd->config; | |
956 | if (!config->dead_conn_timeout) | |
957 | return 0; | |
491bf8f2 XY |
958 | |
959 | if (!wait_event_timeout(config->conn_wait, | |
960 | test_bit(NBD_RT_DISCONNECTED, | |
961 | &config->runtime_flags) || | |
962 | atomic_read(&config->live_connections) > 0, | |
963 | config->dead_conn_timeout)) | |
560bc4b3 | 964 | return 0; |
491bf8f2 XY |
965 | |
966 | return !test_bit(NBD_RT_DISCONNECTED, &config->runtime_flags); | |
560bc4b3 JB |
967 | } |
968 | ||
9dd5d3ab | 969 | static int nbd_handle_cmd(struct nbd_cmd *cmd, int index) |
48cf6061 | 970 | { |
fd8383fd JB |
971 | struct request *req = blk_mq_rq_from_pdu(cmd); |
972 | struct nbd_device *nbd = cmd->nbd; | |
5ea8d108 | 973 | struct nbd_config *config; |
9561a7ad | 974 | struct nbd_sock *nsock; |
9dd5d3ab | 975 | int ret; |
fd8383fd | 976 | |
5ea8d108 JB |
977 | if (!refcount_inc_not_zero(&nbd->config_refs)) { |
978 | dev_err_ratelimited(disk_to_dev(nbd->disk), | |
979 | "Socks array is empty\n"); | |
980 | return -EINVAL; | |
981 | } | |
982 | config = nbd->config; | |
983 | ||
984 | if (index >= config->num_connections) { | |
a897b666 JB |
985 | dev_err_ratelimited(disk_to_dev(nbd->disk), |
986 | "Attempted send on invalid socket\n"); | |
5ea8d108 | 987 | nbd_config_put(nbd); |
9dd5d3ab | 988 | return -EINVAL; |
9561a7ad | 989 | } |
2a842aca | 990 | cmd->status = BLK_STS_OK; |
f3733247 | 991 | again: |
5ea8d108 | 992 | nsock = config->socks[index]; |
9561a7ad | 993 | mutex_lock(&nsock->tx_lock); |
f3733247 | 994 | if (nsock->dead) { |
560bc4b3 | 995 | int old_index = index; |
f3733247 | 996 | index = find_fallback(nbd, index); |
560bc4b3 | 997 | mutex_unlock(&nsock->tx_lock); |
5ea8d108 | 998 | if (index < 0) { |
560bc4b3 JB |
999 | if (wait_for_reconnect(nbd)) { |
1000 | index = old_index; | |
1001 | goto again; | |
1002 | } | |
1003 | /* All the sockets should already be down at this point, | |
1004 | * we just want to make sure that DISCONNECTED is set so | |
1005 | * any requests that come in that were queue'ed waiting | |
1006 | * for the reconnect timer don't trigger the timer again | |
1007 | * and instead just error out. | |
1008 | */ | |
1009 | sock_shutdown(nbd); | |
1010 | nbd_config_put(nbd); | |
1011 | return -EIO; | |
5ea8d108 | 1012 | } |
f3733247 | 1013 | goto again; |
48cf6061 LV |
1014 | } |
1015 | ||
9dd5d3ab JB |
1016 | /* Handle the case that we have a pending request that was partially |
1017 | * transmitted that _has_ to be serviced first. We need to call requeue | |
1018 | * here so that it gets put _after_ the request that is already on the | |
1019 | * dispatch list. | |
1020 | */ | |
6a468d59 | 1021 | blk_mq_start_request(req); |
9dd5d3ab | 1022 | if (unlikely(nsock->pending && nsock->pending != req)) { |
d7d94d48 | 1023 | nbd_requeue_cmd(cmd); |
9dd5d3ab JB |
1024 | ret = 0; |
1025 | goto out; | |
48cf6061 | 1026 | } |
f3733247 JB |
1027 | /* |
1028 | * Some failures are related to the link going down, so anything that | |
1029 | * returns EAGAIN can be retried on a different socket. | |
1030 | */ | |
9dd5d3ab | 1031 | ret = nbd_send_cmd(nbd, cmd, index); |
4e6eef5d YK |
1032 | /* |
1033 | * Access to this flag is protected by cmd->lock, thus it's safe to set | |
1034 | * the flag after nbd_send_cmd() succeed to send request to server. | |
1035 | */ | |
1036 | if (!ret) | |
1037 | __set_bit(NBD_CMD_INFLIGHT, &cmd->flags); | |
1038 | else if (ret == -EAGAIN) { | |
f3733247 | 1039 | dev_err_ratelimited(disk_to_dev(nbd->disk), |
6a468d59 | 1040 | "Request send failed, requeueing\n"); |
799f9a38 | 1041 | nbd_mark_nsock_dead(nbd, nsock, 1); |
d7d94d48 | 1042 | nbd_requeue_cmd(cmd); |
6a468d59 | 1043 | ret = 0; |
f3733247 | 1044 | } |
9dd5d3ab | 1045 | out: |
9561a7ad | 1046 | mutex_unlock(&nsock->tx_lock); |
5ea8d108 | 1047 | nbd_config_put(nbd); |
9dd5d3ab | 1048 | return ret; |
48cf6061 LV |
1049 | } |
1050 | ||
fc17b653 | 1051 | static blk_status_t nbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
fd8383fd | 1052 | const struct blk_mq_queue_data *bd) |
1da177e4 | 1053 | { |
fd8383fd | 1054 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
9dd5d3ab | 1055 | int ret; |
1da177e4 | 1056 | |
9561a7ad JB |
1057 | /* |
1058 | * Since we look at the bio's to send the request over the network we | |
1059 | * need to make sure the completion work doesn't mark this request done | |
1060 | * before we are done doing our send. This keeps us from dereferencing | |
1061 | * freed data if we have particularly fast completions (ie we get the | |
1062 | * completion before we exit sock_xmit on the last bvec) or in the case | |
1063 | * that the server is misbehaving (or there was an error) before we're | |
1064 | * done sending everything over the wire. | |
1065 | */ | |
8f3ea359 | 1066 | mutex_lock(&cmd->lock); |
d7d94d48 | 1067 | clear_bit(NBD_CMD_REQUEUED, &cmd->flags); |
9dd5d3ab JB |
1068 | |
1069 | /* We can be called directly from the user space process, which means we | |
1070 | * could possibly have signals pending so our sendmsg will fail. In | |
1071 | * this case we need to return that we are busy, otherwise error out as | |
1072 | * appropriate. | |
1073 | */ | |
1074 | ret = nbd_handle_cmd(cmd, hctx->queue_num); | |
6e60a3bb JB |
1075 | if (ret < 0) |
1076 | ret = BLK_STS_IOERR; | |
1077 | else if (!ret) | |
1078 | ret = BLK_STS_OK; | |
8f3ea359 | 1079 | mutex_unlock(&cmd->lock); |
9561a7ad | 1080 | |
6e60a3bb | 1081 | return ret; |
1da177e4 LT |
1082 | } |
1083 | ||
cf1b2326 MC |
1084 | static struct socket *nbd_get_socket(struct nbd_device *nbd, unsigned long fd, |
1085 | int *err) | |
1086 | { | |
1087 | struct socket *sock; | |
1088 | ||
1089 | *err = 0; | |
1090 | sock = sockfd_lookup(fd, err); | |
1091 | if (!sock) | |
1092 | return NULL; | |
1093 | ||
1094 | if (sock->ops->shutdown == sock_no_shutdown) { | |
1095 | dev_err(disk_to_dev(nbd->disk), "Unsupported socket: shutdown callout must be supported.\n"); | |
1096 | *err = -EINVAL; | |
dff10bbe | 1097 | sockfd_put(sock); |
cf1b2326 MC |
1098 | return NULL; |
1099 | } | |
1100 | ||
1101 | return sock; | |
1102 | } | |
1103 | ||
e46c7287 JB |
1104 | static int nbd_add_socket(struct nbd_device *nbd, unsigned long arg, |
1105 | bool netlink) | |
23272a67 | 1106 | { |
5ea8d108 | 1107 | struct nbd_config *config = nbd->config; |
9442b739 | 1108 | struct socket *sock; |
9561a7ad JB |
1109 | struct nbd_sock **socks; |
1110 | struct nbd_sock *nsock; | |
9442b739 JB |
1111 | int err; |
1112 | ||
cf1b2326 | 1113 | sock = nbd_get_socket(nbd, arg, &err); |
9442b739 JB |
1114 | if (!sock) |
1115 | return err; | |
23272a67 | 1116 | |
b98e762e JB |
1117 | /* |
1118 | * We need to make sure we don't get any errant requests while we're | |
1119 | * reallocating the ->socks array. | |
1120 | */ | |
1121 | blk_mq_freeze_queue(nbd->disk->queue); | |
1122 | ||
e46c7287 | 1123 | if (!netlink && !nbd->task_setup && |
ec76a7b9 | 1124 | !test_bit(NBD_RT_BOUND, &config->runtime_flags)) |
9561a7ad | 1125 | nbd->task_setup = current; |
e46c7287 JB |
1126 | |
1127 | if (!netlink && | |
1128 | (nbd->task_setup != current || | |
ec76a7b9 | 1129 | test_bit(NBD_RT_BOUND, &config->runtime_flags))) { |
9561a7ad JB |
1130 | dev_err(disk_to_dev(nbd->disk), |
1131 | "Device being setup by another task"); | |
579dd91a ZB |
1132 | err = -EBUSY; |
1133 | goto put_socket; | |
1134 | } | |
1135 | ||
1136 | nsock = kzalloc(sizeof(*nsock), GFP_KERNEL); | |
1137 | if (!nsock) { | |
1138 | err = -ENOMEM; | |
1139 | goto put_socket; | |
23272a67 MP |
1140 | } |
1141 | ||
5ea8d108 | 1142 | socks = krealloc(config->socks, (config->num_connections + 1) * |
9561a7ad | 1143 | sizeof(struct nbd_sock *), GFP_KERNEL); |
9b1355d5 | 1144 | if (!socks) { |
579dd91a ZB |
1145 | kfree(nsock); |
1146 | err = -ENOMEM; | |
1147 | goto put_socket; | |
9b1355d5 | 1148 | } |
03bf73c3 NE |
1149 | |
1150 | config->socks = socks; | |
1151 | ||
f3733247 JB |
1152 | nsock->fallback_index = -1; |
1153 | nsock->dead = false; | |
9561a7ad JB |
1154 | mutex_init(&nsock->tx_lock); |
1155 | nsock->sock = sock; | |
9dd5d3ab JB |
1156 | nsock->pending = NULL; |
1157 | nsock->sent = 0; | |
799f9a38 | 1158 | nsock->cookie = 0; |
5ea8d108 | 1159 | socks[config->num_connections++] = nsock; |
560bc4b3 | 1160 | atomic_inc(&config->live_connections); |
b98e762e | 1161 | blk_mq_unfreeze_queue(nbd->disk->queue); |
23272a67 | 1162 | |
9561a7ad | 1163 | return 0; |
579dd91a ZB |
1164 | |
1165 | put_socket: | |
b98e762e | 1166 | blk_mq_unfreeze_queue(nbd->disk->queue); |
579dd91a ZB |
1167 | sockfd_put(sock); |
1168 | return err; | |
23272a67 MP |
1169 | } |
1170 | ||
b7aa3d39 JB |
1171 | static int nbd_reconnect_socket(struct nbd_device *nbd, unsigned long arg) |
1172 | { | |
1173 | struct nbd_config *config = nbd->config; | |
1174 | struct socket *sock, *old; | |
1175 | struct recv_thread_args *args; | |
1176 | int i; | |
1177 | int err; | |
1178 | ||
cf1b2326 | 1179 | sock = nbd_get_socket(nbd, arg, &err); |
b7aa3d39 JB |
1180 | if (!sock) |
1181 | return err; | |
1182 | ||
1183 | args = kzalloc(sizeof(*args), GFP_KERNEL); | |
1184 | if (!args) { | |
1185 | sockfd_put(sock); | |
1186 | return -ENOMEM; | |
1187 | } | |
1188 | ||
1189 | for (i = 0; i < config->num_connections; i++) { | |
1190 | struct nbd_sock *nsock = config->socks[i]; | |
1191 | ||
1192 | if (!nsock->dead) | |
1193 | continue; | |
1194 | ||
1195 | mutex_lock(&nsock->tx_lock); | |
1196 | if (!nsock->dead) { | |
1197 | mutex_unlock(&nsock->tx_lock); | |
1198 | continue; | |
1199 | } | |
1200 | sk_set_memalloc(sock->sk); | |
a7ee8cf1 JB |
1201 | if (nbd->tag_set.timeout) |
1202 | sock->sk->sk_sndtimeo = nbd->tag_set.timeout; | |
b7aa3d39 JB |
1203 | atomic_inc(&config->recv_threads); |
1204 | refcount_inc(&nbd->config_refs); | |
1205 | old = nsock->sock; | |
1206 | nsock->fallback_index = -1; | |
1207 | nsock->sock = sock; | |
1208 | nsock->dead = false; | |
1209 | INIT_WORK(&args->work, recv_work); | |
1210 | args->index = i; | |
1211 | args->nbd = nbd; | |
799f9a38 | 1212 | nsock->cookie++; |
b7aa3d39 JB |
1213 | mutex_unlock(&nsock->tx_lock); |
1214 | sockfd_put(old); | |
1215 | ||
ec76a7b9 | 1216 | clear_bit(NBD_RT_DISCONNECTED, &config->runtime_flags); |
7a362ea9 | 1217 | |
b7aa3d39 JB |
1218 | /* We take the tx_mutex in an error path in the recv_work, so we |
1219 | * need to queue_work outside of the tx_mutex. | |
1220 | */ | |
e9e006f5 | 1221 | queue_work(nbd->recv_workq, &args->work); |
560bc4b3 JB |
1222 | |
1223 | atomic_inc(&config->live_connections); | |
1224 | wake_up(&config->conn_wait); | |
b7aa3d39 JB |
1225 | return 0; |
1226 | } | |
1227 | sockfd_put(sock); | |
1228 | kfree(args); | |
1229 | return -ENOSPC; | |
1230 | } | |
1231 | ||
2a852a69 | 1232 | static void nbd_bdev_reset(struct nbd_device *nbd) |
0e4f0f6f | 1233 | { |
dbdc1be3 | 1234 | if (disk_openers(nbd->disk) > 1) |
abbbdf12 | 1235 | return; |
2a852a69 | 1236 | set_capacity(nbd->disk, 0); |
0e4f0f6f MP |
1237 | } |
1238 | ||
29eaadc0 | 1239 | static void nbd_parse_flags(struct nbd_device *nbd) |
d02cf531 | 1240 | { |
5ea8d108 JB |
1241 | struct nbd_config *config = nbd->config; |
1242 | if (config->flags & NBD_FLAG_READ_ONLY) | |
29eaadc0 JB |
1243 | set_disk_ro(nbd->disk, true); |
1244 | else | |
1245 | set_disk_ro(nbd->disk, false); | |
685c9b24 SM |
1246 | if (config->flags & NBD_FLAG_SEND_FLUSH) { |
1247 | if (config->flags & NBD_FLAG_SEND_FUA) | |
1248 | blk_queue_write_cache(nbd->disk->queue, true, true); | |
1249 | else | |
1250 | blk_queue_write_cache(nbd->disk->queue, true, false); | |
1251 | } | |
d02cf531 | 1252 | else |
aafb1eec | 1253 | blk_queue_write_cache(nbd->disk->queue, false, false); |
d02cf531 MP |
1254 | } |
1255 | ||
9561a7ad JB |
1256 | static void send_disconnects(struct nbd_device *nbd) |
1257 | { | |
5ea8d108 | 1258 | struct nbd_config *config = nbd->config; |
c9f2b6ae AV |
1259 | struct nbd_request request = { |
1260 | .magic = htonl(NBD_REQUEST_MAGIC), | |
1261 | .type = htonl(NBD_CMD_DISC), | |
1262 | }; | |
1263 | struct kvec iov = {.iov_base = &request, .iov_len = sizeof(request)}; | |
1264 | struct iov_iter from; | |
9561a7ad JB |
1265 | int i, ret; |
1266 | ||
5ea8d108 | 1267 | for (i = 0; i < config->num_connections; i++) { |
b4b2aecc JB |
1268 | struct nbd_sock *nsock = config->socks[i]; |
1269 | ||
de4eda9d | 1270 | iov_iter_kvec(&from, ITER_SOURCE, &iov, 1, sizeof(request)); |
b4b2aecc | 1271 | mutex_lock(&nsock->tx_lock); |
9dd5d3ab | 1272 | ret = sock_xmit(nbd, i, 1, &from, 0, NULL); |
f52c0e08 | 1273 | if (ret < 0) |
9561a7ad JB |
1274 | dev_err(disk_to_dev(nbd->disk), |
1275 | "Send disconnect failed %d\n", ret); | |
b4b2aecc | 1276 | mutex_unlock(&nsock->tx_lock); |
9561a7ad JB |
1277 | } |
1278 | } | |
1279 | ||
29eaadc0 | 1280 | static int nbd_disconnect(struct nbd_device *nbd) |
9442b739 | 1281 | { |
5ea8d108 | 1282 | struct nbd_config *config = nbd->config; |
30d53d9c | 1283 | |
5ea8d108 | 1284 | dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n"); |
ec76a7b9 | 1285 | set_bit(NBD_RT_DISCONNECT_REQUESTED, &config->runtime_flags); |
8454d685 | 1286 | set_bit(NBD_DISCONNECT_REQUESTED, &nbd->flags); |
2e13456f | 1287 | send_disconnects(nbd); |
9442b739 JB |
1288 | return 0; |
1289 | } | |
1290 | ||
29eaadc0 | 1291 | static void nbd_clear_sock(struct nbd_device *nbd) |
1a2ad211 | 1292 | { |
9442b739 JB |
1293 | sock_shutdown(nbd); |
1294 | nbd_clear_que(nbd); | |
5ea8d108 | 1295 | nbd->task_setup = NULL; |
5ea8d108 JB |
1296 | } |
1297 | ||
1298 | static void nbd_config_put(struct nbd_device *nbd) | |
1299 | { | |
1300 | if (refcount_dec_and_mutex_lock(&nbd->config_refs, | |
1301 | &nbd->config_lock)) { | |
5ea8d108 | 1302 | struct nbd_config *config = nbd->config; |
5ea8d108 | 1303 | nbd_dev_dbg_close(nbd); |
435c2acb XY |
1304 | invalidate_disk(nbd->disk); |
1305 | if (nbd->config->bytesize) | |
1306 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); | |
ec76a7b9 | 1307 | if (test_and_clear_bit(NBD_RT_HAS_PID_FILE, |
5ea8d108 JB |
1308 | &config->runtime_flags)) |
1309 | device_remove_file(disk_to_dev(nbd->disk), &pid_attr); | |
0c98057b | 1310 | nbd->pid = 0; |
6497ef8d PKK |
1311 | if (test_and_clear_bit(NBD_RT_HAS_BACKEND_FILE, |
1312 | &config->runtime_flags)) { | |
1313 | device_remove_file(disk_to_dev(nbd->disk), &backend_attr); | |
1314 | kfree(nbd->backend); | |
1315 | nbd->backend = NULL; | |
1316 | } | |
29eaadc0 | 1317 | nbd_clear_sock(nbd); |
5ea8d108 JB |
1318 | if (config->num_connections) { |
1319 | int i; | |
1320 | for (i = 0; i < config->num_connections; i++) { | |
1321 | sockfd_put(config->socks[i]->sock); | |
1322 | kfree(config->socks[i]); | |
1323 | } | |
1324 | kfree(config->socks); | |
1325 | } | |
fa976532 | 1326 | kfree(nbd->config); |
af622b86 ID |
1327 | nbd->config = NULL; |
1328 | ||
1329 | nbd->tag_set.timeout = 0; | |
6df133a1 | 1330 | nbd->disk->queue->limits.discard_granularity = 0; |
70200574 | 1331 | blk_queue_max_discard_sectors(nbd->disk->queue, 0); |
a2c97909 | 1332 | |
5ea8d108 | 1333 | mutex_unlock(&nbd->config_lock); |
c6a4759e | 1334 | nbd_put(nbd); |
5ea8d108 JB |
1335 | module_put(THIS_MODULE); |
1336 | } | |
9442b739 JB |
1337 | } |
1338 | ||
e46c7287 | 1339 | static int nbd_start_device(struct nbd_device *nbd) |
9442b739 | 1340 | { |
5ea8d108 JB |
1341 | struct nbd_config *config = nbd->config; |
1342 | int num_connections = config->num_connections; | |
9442b739 | 1343 | int error = 0, i; |
1a2ad211 | 1344 | |
0c98057b | 1345 | if (nbd->pid) |
9442b739 | 1346 | return -EBUSY; |
5ea8d108 | 1347 | if (!config->socks) |
9442b739 JB |
1348 | return -EINVAL; |
1349 | if (num_connections > 1 && | |
5ea8d108 | 1350 | !(config->flags & NBD_FLAG_CAN_MULTI_CONN)) { |
9442b739 | 1351 | dev_err(disk_to_dev(nbd->disk), "server does not support multiple connections per device.\n"); |
5ea8d108 | 1352 | return -EINVAL; |
9442b739 | 1353 | } |
23272a67 | 1354 | |
5ea8d108 | 1355 | blk_mq_update_nr_hw_queues(&nbd->tag_set, config->num_connections); |
0c98057b | 1356 | nbd->pid = task_pid_nr(current); |
23272a67 | 1357 | |
29eaadc0 | 1358 | nbd_parse_flags(nbd); |
23272a67 | 1359 | |
9442b739 JB |
1360 | error = device_create_file(disk_to_dev(nbd->disk), &pid_attr); |
1361 | if (error) { | |
6497ef8d | 1362 | dev_err(disk_to_dev(nbd->disk), "device_create_file failed for pid!\n"); |
5ea8d108 | 1363 | return error; |
1a2ad211 | 1364 | } |
ec76a7b9 | 1365 | set_bit(NBD_RT_HAS_PID_FILE, &config->runtime_flags); |
37091fdd | 1366 | |
9442b739 JB |
1367 | nbd_dev_dbg_init(nbd); |
1368 | for (i = 0; i < num_connections; i++) { | |
5ea8d108 JB |
1369 | struct recv_thread_args *args; |
1370 | ||
1371 | args = kzalloc(sizeof(*args), GFP_KERNEL); | |
1372 | if (!args) { | |
1373 | sock_shutdown(nbd); | |
5c0dd228 SK |
1374 | /* |
1375 | * If num_connections is m (2 < m), | |
1376 | * and NO.1 ~ NO.n(1 < n < m) kzallocs are successful. | |
1377 | * But NO.(n + 1) failed. We still have n recv threads. | |
1378 | * So, add flush_workqueue here to prevent recv threads | |
1379 | * dropping the last config_refs and trying to destroy | |
1380 | * the workqueue from inside the workqueue. | |
1381 | */ | |
1382 | if (i) | |
1383 | flush_workqueue(nbd->recv_workq); | |
5ea8d108 JB |
1384 | return -ENOMEM; |
1385 | } | |
1386 | sk_set_memalloc(config->socks[i]->sock->sk); | |
a7ee8cf1 JB |
1387 | if (nbd->tag_set.timeout) |
1388 | config->socks[i]->sock->sk->sk_sndtimeo = | |
1389 | nbd->tag_set.timeout; | |
5ea8d108 JB |
1390 | atomic_inc(&config->recv_threads); |
1391 | refcount_inc(&nbd->config_refs); | |
1392 | INIT_WORK(&args->work, recv_work); | |
1393 | args->nbd = nbd; | |
1394 | args->index = i; | |
e9e006f5 | 1395 | queue_work(nbd->recv_workq, &args->work); |
37091fdd | 1396 | } |
41e76c6a | 1397 | return nbd_set_size(nbd, config->bytesize, nbd_blksize(config)); |
e46c7287 JB |
1398 | } |
1399 | ||
2a852a69 | 1400 | static int nbd_start_device_ioctl(struct nbd_device *nbd) |
e46c7287 JB |
1401 | { |
1402 | struct nbd_config *config = nbd->config; | |
1403 | int ret; | |
1404 | ||
1405 | ret = nbd_start_device(nbd); | |
1406 | if (ret) | |
1407 | return ret; | |
1408 | ||
e46c7287 | 1409 | if (max_part) |
38430f08 | 1410 | set_bit(GD_NEED_PART_SCAN, &nbd->disk->state); |
e46c7287 JB |
1411 | mutex_unlock(&nbd->config_lock); |
1412 | ret = wait_event_interruptible(config->recv_wq, | |
5ea8d108 | 1413 | atomic_read(&config->recv_threads) == 0); |
1de7c3cf | 1414 | if (ret) { |
5ea8d108 | 1415 | sock_shutdown(nbd); |
1de7c3cf SY |
1416 | nbd_clear_que(nbd); |
1417 | } | |
1c05839a | 1418 | |
1de7c3cf | 1419 | flush_workqueue(nbd->recv_workq); |
9442b739 | 1420 | mutex_lock(&nbd->config_lock); |
2a852a69 | 1421 | nbd_bdev_reset(nbd); |
9442b739 | 1422 | /* user requested, ignore socket errors */ |
ec76a7b9 | 1423 | if (test_bit(NBD_RT_DISCONNECT_REQUESTED, &config->runtime_flags)) |
e46c7287 | 1424 | ret = 0; |
ec76a7b9 | 1425 | if (test_bit(NBD_RT_TIMEDOUT, &config->runtime_flags)) |
e46c7287 JB |
1426 | ret = -ETIMEDOUT; |
1427 | return ret; | |
9442b739 JB |
1428 | } |
1429 | ||
29eaadc0 JB |
1430 | static void nbd_clear_sock_ioctl(struct nbd_device *nbd, |
1431 | struct block_device *bdev) | |
1432 | { | |
09dadb59 | 1433 | nbd_clear_sock(nbd); |
2b5c8f00 | 1434 | __invalidate_device(bdev, true); |
2a852a69 | 1435 | nbd_bdev_reset(nbd); |
ec76a7b9 | 1436 | if (test_and_clear_bit(NBD_RT_HAS_CONFIG_REF, |
e46c7287 JB |
1437 | &nbd->config->runtime_flags)) |
1438 | nbd_config_put(nbd); | |
29eaadc0 JB |
1439 | } |
1440 | ||
55313e92 MC |
1441 | static void nbd_set_cmd_timeout(struct nbd_device *nbd, u64 timeout) |
1442 | { | |
1443 | nbd->tag_set.timeout = timeout * HZ; | |
2da22da5 MC |
1444 | if (timeout) |
1445 | blk_queue_rq_timeout(nbd->disk->queue, timeout * HZ); | |
acb19e17 HP |
1446 | else |
1447 | blk_queue_rq_timeout(nbd->disk->queue, 30 * HZ); | |
55313e92 MC |
1448 | } |
1449 | ||
9442b739 JB |
1450 | /* Must be called with config_lock held */ |
1451 | static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, | |
1452 | unsigned int cmd, unsigned long arg) | |
1453 | { | |
5ea8d108 | 1454 | struct nbd_config *config = nbd->config; |
fad7cd33 | 1455 | loff_t bytesize; |
5ea8d108 | 1456 | |
9442b739 JB |
1457 | switch (cmd) { |
1458 | case NBD_DISCONNECT: | |
29eaadc0 | 1459 | return nbd_disconnect(nbd); |
9442b739 | 1460 | case NBD_CLEAR_SOCK: |
29eaadc0 JB |
1461 | nbd_clear_sock_ioctl(nbd, bdev); |
1462 | return 0; | |
9442b739 | 1463 | case NBD_SET_SOCK: |
e46c7287 | 1464 | return nbd_add_socket(nbd, arg, false); |
9442b739 | 1465 | case NBD_SET_BLKSIZE: |
dcbddf54 | 1466 | return nbd_set_size(nbd, config->bytesize, arg); |
1da177e4 | 1467 | case NBD_SET_SIZE: |
41e76c6a | 1468 | return nbd_set_size(nbd, arg, nbd_blksize(config)); |
37091fdd | 1469 | case NBD_SET_SIZE_BLOCKS: |
41e76c6a | 1470 | if (check_shl_overflow(arg, config->blksize_bits, &bytesize)) |
fad7cd33 | 1471 | return -EINVAL; |
41e76c6a | 1472 | return nbd_set_size(nbd, bytesize, nbd_blksize(config)); |
7fdfd406 | 1473 | case NBD_SET_TIMEOUT: |
2da22da5 | 1474 | nbd_set_cmd_timeout(nbd, arg); |
7fdfd406 | 1475 | return 0; |
1a2ad211 | 1476 | |
2f012508 | 1477 | case NBD_SET_FLAGS: |
5ea8d108 | 1478 | config->flags = arg; |
2f012508 | 1479 | return 0; |
9442b739 | 1480 | case NBD_DO_IT: |
2a852a69 | 1481 | return nbd_start_device_ioctl(nbd); |
1da177e4 | 1482 | case NBD_CLEAR_QUE: |
4b2f0260 HX |
1483 | /* |
1484 | * This is for compatibility only. The queue is always cleared | |
1485 | * by NBD_DO_IT or NBD_CLEAR_SOCK. | |
1486 | */ | |
1da177e4 LT |
1487 | return 0; |
1488 | case NBD_PRINT_DEBUG: | |
fd8383fd JB |
1489 | /* |
1490 | * For compatibility only, we no longer keep a list of | |
1491 | * outstanding requests. | |
1492 | */ | |
1da177e4 LT |
1493 | return 0; |
1494 | } | |
1a2ad211 PM |
1495 | return -ENOTTY; |
1496 | } | |
1497 | ||
1498 | static int nbd_ioctl(struct block_device *bdev, fmode_t mode, | |
1499 | unsigned int cmd, unsigned long arg) | |
1500 | { | |
f4507164 | 1501 | struct nbd_device *nbd = bdev->bd_disk->private_data; |
e46c7287 JB |
1502 | struct nbd_config *config = nbd->config; |
1503 | int error = -EINVAL; | |
1a2ad211 PM |
1504 | |
1505 | if (!capable(CAP_SYS_ADMIN)) | |
1506 | return -EPERM; | |
1507 | ||
1dae69be JB |
1508 | /* The block layer will pass back some non-nbd ioctls in case we have |
1509 | * special handling for them, but we don't so just return an error. | |
1510 | */ | |
1511 | if (_IOC_TYPE(cmd) != 0xab) | |
1512 | return -EINVAL; | |
1513 | ||
9561a7ad | 1514 | mutex_lock(&nbd->config_lock); |
e46c7287 JB |
1515 | |
1516 | /* Don't allow ioctl operations on a nbd device that was created with | |
1517 | * netlink, unless it's DISCONNECT or CLEAR_SOCK, which are fine. | |
1518 | */ | |
ec76a7b9 | 1519 | if (!test_bit(NBD_RT_BOUND, &config->runtime_flags) || |
e46c7287 JB |
1520 | (cmd == NBD_DISCONNECT || cmd == NBD_CLEAR_SOCK)) |
1521 | error = __nbd_ioctl(bdev, nbd, cmd, arg); | |
1522 | else | |
1523 | dev_err(nbd_to_dev(nbd), "Cannot use ioctl interface on a netlink controlled device.\n"); | |
9561a7ad | 1524 | mutex_unlock(&nbd->config_lock); |
1a2ad211 | 1525 | return error; |
1da177e4 LT |
1526 | } |
1527 | ||
5ea8d108 JB |
1528 | static struct nbd_config *nbd_alloc_config(void) |
1529 | { | |
1530 | struct nbd_config *config; | |
1531 | ||
c55b2b98 YK |
1532 | if (!try_module_get(THIS_MODULE)) |
1533 | return ERR_PTR(-ENODEV); | |
1534 | ||
5ea8d108 | 1535 | config = kzalloc(sizeof(struct nbd_config), GFP_NOFS); |
c55b2b98 YK |
1536 | if (!config) { |
1537 | module_put(THIS_MODULE); | |
1538 | return ERR_PTR(-ENOMEM); | |
1539 | } | |
1540 | ||
5ea8d108 JB |
1541 | atomic_set(&config->recv_threads, 0); |
1542 | init_waitqueue_head(&config->recv_wq); | |
560bc4b3 | 1543 | init_waitqueue_head(&config->conn_wait); |
41e76c6a | 1544 | config->blksize_bits = NBD_DEF_BLKSIZE_BITS; |
560bc4b3 | 1545 | atomic_set(&config->live_connections, 0); |
5ea8d108 JB |
1546 | return config; |
1547 | } | |
1548 | ||
1549 | static int nbd_open(struct block_device *bdev, fmode_t mode) | |
1550 | { | |
1551 | struct nbd_device *nbd; | |
1552 | int ret = 0; | |
1553 | ||
1554 | mutex_lock(&nbd_index_mutex); | |
1555 | nbd = bdev->bd_disk->private_data; | |
1556 | if (!nbd) { | |
1557 | ret = -ENXIO; | |
1558 | goto out; | |
1559 | } | |
c6a4759e JB |
1560 | if (!refcount_inc_not_zero(&nbd->refs)) { |
1561 | ret = -ENXIO; | |
1562 | goto out; | |
1563 | } | |
5ea8d108 JB |
1564 | if (!refcount_inc_not_zero(&nbd->config_refs)) { |
1565 | struct nbd_config *config; | |
1566 | ||
1567 | mutex_lock(&nbd->config_lock); | |
1568 | if (refcount_inc_not_zero(&nbd->config_refs)) { | |
1569 | mutex_unlock(&nbd->config_lock); | |
1570 | goto out; | |
1571 | } | |
c55b2b98 YK |
1572 | config = nbd_alloc_config(); |
1573 | if (IS_ERR(config)) { | |
1574 | ret = PTR_ERR(config); | |
5ea8d108 JB |
1575 | mutex_unlock(&nbd->config_lock); |
1576 | goto out; | |
1577 | } | |
c55b2b98 | 1578 | nbd->config = config; |
5ea8d108 | 1579 | refcount_set(&nbd->config_refs, 1); |
c6a4759e | 1580 | refcount_inc(&nbd->refs); |
5ea8d108 | 1581 | mutex_unlock(&nbd->config_lock); |
1aba169e JT |
1582 | if (max_part) |
1583 | set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state); | |
fe1f9e66 | 1584 | } else if (nbd_disconnected(nbd->config)) { |
1aba169e JT |
1585 | if (max_part) |
1586 | set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state); | |
5ea8d108 JB |
1587 | } |
1588 | out: | |
1589 | mutex_unlock(&nbd_index_mutex); | |
1590 | return ret; | |
1591 | } | |
1592 | ||
1593 | static void nbd_release(struct gendisk *disk, fmode_t mode) | |
1594 | { | |
1595 | struct nbd_device *nbd = disk->private_data; | |
08ba91ee | 1596 | |
ec76a7b9 | 1597 | if (test_bit(NBD_RT_DISCONNECT_ON_CLOSE, &nbd->config->runtime_flags) && |
dbdc1be3 | 1598 | disk_openers(disk) == 0) |
08ba91ee DRK |
1599 | nbd_disconnect_and_put(nbd); |
1600 | ||
5ea8d108 | 1601 | nbd_config_put(nbd); |
c6a4759e | 1602 | nbd_put(nbd); |
5ea8d108 JB |
1603 | } |
1604 | ||
83d5cde4 | 1605 | static const struct block_device_operations nbd_fops = |
1da177e4 LT |
1606 | { |
1607 | .owner = THIS_MODULE, | |
5ea8d108 JB |
1608 | .open = nbd_open, |
1609 | .release = nbd_release, | |
8a6cfeb6 | 1610 | .ioctl = nbd_ioctl, |
263a3df1 | 1611 | .compat_ioctl = nbd_ioctl, |
1da177e4 LT |
1612 | }; |
1613 | ||
30d53d9c MP |
1614 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
1615 | ||
1616 | static int nbd_dbg_tasks_show(struct seq_file *s, void *unused) | |
1617 | { | |
1618 | struct nbd_device *nbd = s->private; | |
1619 | ||
0c98057b YB |
1620 | if (nbd->pid) |
1621 | seq_printf(s, "recv: %d\n", nbd->pid); | |
30d53d9c MP |
1622 | |
1623 | return 0; | |
1624 | } | |
1625 | ||
a2d52a6c | 1626 | DEFINE_SHOW_ATTRIBUTE(nbd_dbg_tasks); |
30d53d9c MP |
1627 | |
1628 | static int nbd_dbg_flags_show(struct seq_file *s, void *unused) | |
1629 | { | |
1630 | struct nbd_device *nbd = s->private; | |
5ea8d108 | 1631 | u32 flags = nbd->config->flags; |
30d53d9c MP |
1632 | |
1633 | seq_printf(s, "Hex: 0x%08x\n\n", flags); | |
1634 | ||
1635 | seq_puts(s, "Known flags:\n"); | |
1636 | ||
1637 | if (flags & NBD_FLAG_HAS_FLAGS) | |
1638 | seq_puts(s, "NBD_FLAG_HAS_FLAGS\n"); | |
1639 | if (flags & NBD_FLAG_READ_ONLY) | |
1640 | seq_puts(s, "NBD_FLAG_READ_ONLY\n"); | |
1641 | if (flags & NBD_FLAG_SEND_FLUSH) | |
1642 | seq_puts(s, "NBD_FLAG_SEND_FLUSH\n"); | |
685c9b24 SM |
1643 | if (flags & NBD_FLAG_SEND_FUA) |
1644 | seq_puts(s, "NBD_FLAG_SEND_FUA\n"); | |
30d53d9c MP |
1645 | if (flags & NBD_FLAG_SEND_TRIM) |
1646 | seq_puts(s, "NBD_FLAG_SEND_TRIM\n"); | |
1647 | ||
1648 | return 0; | |
1649 | } | |
1650 | ||
a2d52a6c | 1651 | DEFINE_SHOW_ATTRIBUTE(nbd_dbg_flags); |
30d53d9c MP |
1652 | |
1653 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
1654 | { | |
1655 | struct dentry *dir; | |
5ea8d108 | 1656 | struct nbd_config *config = nbd->config; |
27ea43fe MP |
1657 | |
1658 | if (!nbd_dbg_dir) | |
1659 | return -EIO; | |
30d53d9c MP |
1660 | |
1661 | dir = debugfs_create_dir(nbd_name(nbd), nbd_dbg_dir); | |
27ea43fe MP |
1662 | if (!dir) { |
1663 | dev_err(nbd_to_dev(nbd), "Failed to create debugfs dir for '%s'\n", | |
1664 | nbd_name(nbd)); | |
1665 | return -EIO; | |
30d53d9c | 1666 | } |
5ea8d108 | 1667 | config->dbg_dir = dir; |
30d53d9c | 1668 | |
a2d52a6c | 1669 | debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_fops); |
5ea8d108 | 1670 | debugfs_create_u64("size_bytes", 0444, dir, &config->bytesize); |
0eadf37a | 1671 | debugfs_create_u32("timeout", 0444, dir, &nbd->tag_set.timeout); |
41e76c6a | 1672 | debugfs_create_u32("blocksize_bits", 0444, dir, &config->blksize_bits); |
a2d52a6c | 1673 | debugfs_create_file("flags", 0444, dir, nbd, &nbd_dbg_flags_fops); |
30d53d9c MP |
1674 | |
1675 | return 0; | |
1676 | } | |
1677 | ||
1678 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
1679 | { | |
5ea8d108 | 1680 | debugfs_remove_recursive(nbd->config->dbg_dir); |
30d53d9c MP |
1681 | } |
1682 | ||
1683 | static int nbd_dbg_init(void) | |
1684 | { | |
1685 | struct dentry *dbg_dir; | |
1686 | ||
1687 | dbg_dir = debugfs_create_dir("nbd", NULL); | |
27ea43fe MP |
1688 | if (!dbg_dir) |
1689 | return -EIO; | |
30d53d9c MP |
1690 | |
1691 | nbd_dbg_dir = dbg_dir; | |
1692 | ||
1693 | return 0; | |
1694 | } | |
1695 | ||
1696 | static void nbd_dbg_close(void) | |
1697 | { | |
1698 | debugfs_remove_recursive(nbd_dbg_dir); | |
1699 | } | |
1700 | ||
1701 | #else /* IS_ENABLED(CONFIG_DEBUG_FS) */ | |
1702 | ||
1703 | static int nbd_dev_dbg_init(struct nbd_device *nbd) | |
1704 | { | |
1705 | return 0; | |
1706 | } | |
1707 | ||
1708 | static void nbd_dev_dbg_close(struct nbd_device *nbd) | |
1709 | { | |
1710 | } | |
1711 | ||
1712 | static int nbd_dbg_init(void) | |
1713 | { | |
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | static void nbd_dbg_close(void) | |
1718 | { | |
1719 | } | |
1720 | ||
1721 | #endif | |
1722 | ||
d6296d39 CH |
1723 | static int nbd_init_request(struct blk_mq_tag_set *set, struct request *rq, |
1724 | unsigned int hctx_idx, unsigned int numa_node) | |
fd8383fd JB |
1725 | { |
1726 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
d6296d39 | 1727 | cmd->nbd = set->driver_data; |
d7d94d48 | 1728 | cmd->flags = 0; |
8f3ea359 | 1729 | mutex_init(&cmd->lock); |
fd8383fd JB |
1730 | return 0; |
1731 | } | |
1732 | ||
f363b089 | 1733 | static const struct blk_mq_ops nbd_mq_ops = { |
fd8383fd | 1734 | .queue_rq = nbd_queue_rq, |
1e388ae0 | 1735 | .complete = nbd_complete_rq, |
fd8383fd | 1736 | .init_request = nbd_init_request, |
0eadf37a | 1737 | .timeout = nbd_xmit_timeout, |
fd8383fd JB |
1738 | }; |
1739 | ||
6e4df4c6 | 1740 | static struct nbd_device *nbd_dev_add(int index, unsigned int refs) |
b0d9111a JB |
1741 | { |
1742 | struct nbd_device *nbd; | |
1743 | struct gendisk *disk; | |
b0d9111a JB |
1744 | int err = -ENOMEM; |
1745 | ||
1746 | nbd = kzalloc(sizeof(struct nbd_device), GFP_KERNEL); | |
1747 | if (!nbd) | |
1748 | goto out; | |
1749 | ||
4af5f2e0 CH |
1750 | nbd->tag_set.ops = &nbd_mq_ops; |
1751 | nbd->tag_set.nr_hw_queues = 1; | |
1752 | nbd->tag_set.queue_depth = 128; | |
1753 | nbd->tag_set.numa_node = NUMA_NO_NODE; | |
1754 | nbd->tag_set.cmd_size = sizeof(struct nbd_cmd); | |
1755 | nbd->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | | |
1756 | BLK_MQ_F_BLOCKING; | |
1757 | nbd->tag_set.driver_data = nbd; | |
68c9417b | 1758 | INIT_WORK(&nbd->remove_work, nbd_dev_remove_work); |
6497ef8d | 1759 | nbd->backend = NULL; |
4af5f2e0 CH |
1760 | |
1761 | err = blk_mq_alloc_tag_set(&nbd->tag_set); | |
1762 | if (err) | |
b0d9111a JB |
1763 | goto out_free_nbd; |
1764 | ||
6e4df4c6 | 1765 | mutex_lock(&nbd_index_mutex); |
b0d9111a JB |
1766 | if (index >= 0) { |
1767 | err = idr_alloc(&nbd_index_idr, nbd, index, index + 1, | |
1768 | GFP_KERNEL); | |
1769 | if (err == -ENOSPC) | |
1770 | err = -EEXIST; | |
1771 | } else { | |
1772 | err = idr_alloc(&nbd_index_idr, nbd, 0, 0, GFP_KERNEL); | |
1773 | if (err >= 0) | |
1774 | index = err; | |
1775 | } | |
b190300d | 1776 | nbd->index = index; |
6e4df4c6 | 1777 | mutex_unlock(&nbd_index_mutex); |
b0d9111a | 1778 | if (err < 0) |
4af5f2e0 | 1779 | goto out_free_tags; |
b0d9111a | 1780 | |
4af5f2e0 CH |
1781 | disk = blk_mq_alloc_disk(&nbd->tag_set, NULL); |
1782 | if (IS_ERR(disk)) { | |
1783 | err = PTR_ERR(disk); | |
b0d9111a | 1784 | goto out_free_idr; |
b0d9111a | 1785 | } |
4af5f2e0 | 1786 | nbd->disk = disk; |
b0d9111a | 1787 | |
e2daec48 YB |
1788 | nbd->recv_workq = alloc_workqueue("nbd%d-recv", |
1789 | WQ_MEM_RECLAIM | WQ_HIGHPRI | | |
1790 | WQ_UNBOUND, 0, nbd->index); | |
1791 | if (!nbd->recv_workq) { | |
1792 | dev_err(disk_to_dev(nbd->disk), "Could not allocate knbd recv work queue.\n"); | |
1793 | err = -ENOMEM; | |
1794 | goto out_err_disk; | |
1795 | } | |
1796 | ||
b0d9111a JB |
1797 | /* |
1798 | * Tell the block layer that we are not a rotational device | |
1799 | */ | |
8b904b5b BVA |
1800 | blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue); |
1801 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, disk->queue); | |
6df133a1 JB |
1802 | disk->queue->limits.discard_granularity = 0; |
1803 | blk_queue_max_discard_sectors(disk->queue, 0); | |
ebb16d0d | 1804 | blk_queue_max_segment_size(disk->queue, UINT_MAX); |
1cc1f17a | 1805 | blk_queue_max_segments(disk->queue, USHRT_MAX); |
b0d9111a JB |
1806 | blk_queue_max_hw_sectors(disk->queue, 65536); |
1807 | disk->queue->limits.max_sectors = 256; | |
1808 | ||
b0d9111a | 1809 | mutex_init(&nbd->config_lock); |
5ea8d108 | 1810 | refcount_set(&nbd->config_refs, 0); |
75b7f62a TH |
1811 | /* |
1812 | * Start out with a zero references to keep other threads from using | |
1813 | * this device until it is fully initialized. | |
1814 | */ | |
1815 | refcount_set(&nbd->refs, 0); | |
c6a4759e | 1816 | INIT_LIST_HEAD(&nbd->list); |
b0d9111a | 1817 | disk->major = NBD_MAJOR; |
7198bfc2 | 1818 | disk->first_minor = index << part_shift; |
4af5f2e0 | 1819 | disk->minors = 1 << part_shift; |
b0d9111a JB |
1820 | disk->fops = &nbd_fops; |
1821 | disk->private_data = nbd; | |
1822 | sprintf(disk->disk_name, "nbd%d", index); | |
e1654f41 LC |
1823 | err = add_disk(disk); |
1824 | if (err) | |
e2daec48 | 1825 | goto out_free_work; |
75b7f62a TH |
1826 | |
1827 | /* | |
1828 | * Now publish the device. | |
1829 | */ | |
1830 | refcount_set(&nbd->refs, refs); | |
47d902b9 | 1831 | nbd_total_devices++; |
7bdc00cf | 1832 | return nbd; |
b0d9111a | 1833 | |
e2daec48 YB |
1834 | out_free_work: |
1835 | destroy_workqueue(nbd->recv_workq); | |
e1654f41 | 1836 | out_err_disk: |
8b9ab626 | 1837 | put_disk(disk); |
b0d9111a | 1838 | out_free_idr: |
93f63bc4 | 1839 | mutex_lock(&nbd_index_mutex); |
b0d9111a | 1840 | idr_remove(&nbd_index_idr, index); |
93f63bc4 | 1841 | mutex_unlock(&nbd_index_mutex); |
4af5f2e0 CH |
1842 | out_free_tags: |
1843 | blk_mq_free_tag_set(&nbd->tag_set); | |
b0d9111a JB |
1844 | out_free_nbd: |
1845 | kfree(nbd); | |
1846 | out: | |
7bdc00cf | 1847 | return ERR_PTR(err); |
b0d9111a JB |
1848 | } |
1849 | ||
438cd318 | 1850 | static struct nbd_device *nbd_find_get_unused(void) |
e46c7287 | 1851 | { |
409e0ff1 CH |
1852 | struct nbd_device *nbd; |
1853 | int id; | |
e46c7287 | 1854 | |
409e0ff1 CH |
1855 | lockdep_assert_held(&nbd_index_mutex); |
1856 | ||
438cd318 CH |
1857 | idr_for_each_entry(&nbd_index_idr, nbd, id) { |
1858 | if (refcount_read(&nbd->config_refs) || | |
1859 | test_bit(NBD_DESTROY_ON_DISCONNECT, &nbd->flags)) | |
1860 | continue; | |
1861 | if (refcount_inc_not_zero(&nbd->refs)) | |
409e0ff1 | 1862 | return nbd; |
e46c7287 | 1863 | } |
409e0ff1 CH |
1864 | |
1865 | return NULL; | |
e46c7287 JB |
1866 | } |
1867 | ||
1868 | /* Netlink interface. */ | |
a86c4120 | 1869 | static const struct nla_policy nbd_attr_policy[NBD_ATTR_MAX + 1] = { |
e46c7287 JB |
1870 | [NBD_ATTR_INDEX] = { .type = NLA_U32 }, |
1871 | [NBD_ATTR_SIZE_BYTES] = { .type = NLA_U64 }, | |
1872 | [NBD_ATTR_BLOCK_SIZE_BYTES] = { .type = NLA_U64 }, | |
1873 | [NBD_ATTR_TIMEOUT] = { .type = NLA_U64 }, | |
1874 | [NBD_ATTR_SERVER_FLAGS] = { .type = NLA_U64 }, | |
1875 | [NBD_ATTR_CLIENT_FLAGS] = { .type = NLA_U64 }, | |
1876 | [NBD_ATTR_SOCKETS] = { .type = NLA_NESTED}, | |
560bc4b3 | 1877 | [NBD_ATTR_DEAD_CONN_TIMEOUT] = { .type = NLA_U64 }, |
47d902b9 | 1878 | [NBD_ATTR_DEVICE_LIST] = { .type = NLA_NESTED}, |
6497ef8d | 1879 | [NBD_ATTR_BACKEND_IDENTIFIER] = { .type = NLA_STRING}, |
e46c7287 JB |
1880 | }; |
1881 | ||
a86c4120 | 1882 | static const struct nla_policy nbd_sock_policy[NBD_SOCK_MAX + 1] = { |
e46c7287 JB |
1883 | [NBD_SOCK_FD] = { .type = NLA_U32 }, |
1884 | }; | |
1885 | ||
47d902b9 JB |
1886 | /* We don't use this right now since we don't parse the incoming list, but we |
1887 | * still want it here so userspace knows what to expect. | |
1888 | */ | |
a86c4120 | 1889 | static const struct nla_policy __attribute__((unused)) |
47d902b9 JB |
1890 | nbd_device_policy[NBD_DEVICE_ATTR_MAX + 1] = { |
1891 | [NBD_DEVICE_INDEX] = { .type = NLA_U32 }, | |
1892 | [NBD_DEVICE_CONNECTED] = { .type = NLA_U8 }, | |
1893 | }; | |
1894 | ||
4ddeaae8 MC |
1895 | static int nbd_genl_size_set(struct genl_info *info, struct nbd_device *nbd) |
1896 | { | |
1897 | struct nbd_config *config = nbd->config; | |
41e76c6a | 1898 | u64 bsize = nbd_blksize(config); |
4ddeaae8 MC |
1899 | u64 bytes = config->bytesize; |
1900 | ||
1901 | if (info->attrs[NBD_ATTR_SIZE_BYTES]) | |
1902 | bytes = nla_get_u64(info->attrs[NBD_ATTR_SIZE_BYTES]); | |
1903 | ||
dcbddf54 | 1904 | if (info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]) |
4ddeaae8 | 1905 | bsize = nla_get_u64(info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]); |
4ddeaae8 | 1906 | |
41e76c6a | 1907 | if (bytes != config->bytesize || bsize != nbd_blksize(config)) |
dcbddf54 | 1908 | return nbd_set_size(nbd, bytes, bsize); |
4ddeaae8 MC |
1909 | return 0; |
1910 | } | |
1911 | ||
e46c7287 JB |
1912 | static int nbd_genl_connect(struct sk_buff *skb, struct genl_info *info) |
1913 | { | |
409e0ff1 | 1914 | struct nbd_device *nbd; |
e46c7287 JB |
1915 | struct nbd_config *config; |
1916 | int index = -1; | |
1917 | int ret; | |
a2c97909 | 1918 | bool put_dev = false; |
e46c7287 JB |
1919 | |
1920 | if (!netlink_capable(skb, CAP_SYS_ADMIN)) | |
1921 | return -EPERM; | |
1922 | ||
858f1bf6 | 1923 | if (info->attrs[NBD_ATTR_INDEX]) { |
e46c7287 | 1924 | index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]); |
858f1bf6 ZW |
1925 | |
1926 | /* | |
1927 | * Too big first_minor can cause duplicate creation of | |
1928 | * sysfs files/links, since index << part_shift might overflow, or | |
1929 | * MKDEV() expect that the max bits of first_minor is 20. | |
1930 | */ | |
1931 | if (index < 0 || index > MINORMASK >> part_shift) { | |
1243172d | 1932 | pr_err("illegal input index %d\n", index); |
858f1bf6 ZW |
1933 | return -EINVAL; |
1934 | } | |
1935 | } | |
e46c7287 | 1936 | if (!info->attrs[NBD_ATTR_SOCKETS]) { |
1243172d | 1937 | pr_err("must specify at least one socket\n"); |
e46c7287 JB |
1938 | return -EINVAL; |
1939 | } | |
1940 | if (!info->attrs[NBD_ATTR_SIZE_BYTES]) { | |
1243172d | 1941 | pr_err("must specify a size in bytes for the device\n"); |
e46c7287 JB |
1942 | return -EINVAL; |
1943 | } | |
1944 | again: | |
1945 | mutex_lock(&nbd_index_mutex); | |
1946 | if (index == -1) { | |
438cd318 | 1947 | nbd = nbd_find_get_unused(); |
e46c7287 JB |
1948 | } else { |
1949 | nbd = idr_find(&nbd_index_idr, index); | |
7ee656c3 CH |
1950 | if (nbd) { |
1951 | if ((test_bit(NBD_DESTROY_ON_DISCONNECT, &nbd->flags) && | |
1952 | test_bit(NBD_DISCONNECT_REQUESTED, &nbd->flags)) || | |
1953 | !refcount_inc_not_zero(&nbd->refs)) { | |
e6a76272 | 1954 | mutex_unlock(&nbd_index_mutex); |
bc9da6dd | 1955 | pr_err("device at index %d is going down\n", |
7ee656c3 CH |
1956 | index); |
1957 | return -EINVAL; | |
e6a76272 | 1958 | } |
e6a76272 | 1959 | } |
e46c7287 | 1960 | } |
7ee656c3 | 1961 | mutex_unlock(&nbd_index_mutex); |
8454d685 | 1962 | |
7ee656c3 | 1963 | if (!nbd) { |
6e4df4c6 CH |
1964 | nbd = nbd_dev_add(index, 2); |
1965 | if (IS_ERR(nbd)) { | |
bc9da6dd | 1966 | pr_err("failed to add new device\n"); |
6e4df4c6 CH |
1967 | return PTR_ERR(nbd); |
1968 | } | |
e46c7287 JB |
1969 | } |
1970 | ||
1971 | mutex_lock(&nbd->config_lock); | |
1972 | if (refcount_read(&nbd->config_refs)) { | |
1973 | mutex_unlock(&nbd->config_lock); | |
c6a4759e | 1974 | nbd_put(nbd); |
e46c7287 JB |
1975 | if (index == -1) |
1976 | goto again; | |
1243172d | 1977 | pr_err("nbd%d already in use\n", index); |
e46c7287 JB |
1978 | return -EBUSY; |
1979 | } | |
1980 | if (WARN_ON(nbd->config)) { | |
1981 | mutex_unlock(&nbd->config_lock); | |
c6a4759e | 1982 | nbd_put(nbd); |
e46c7287 JB |
1983 | return -EINVAL; |
1984 | } | |
c55b2b98 YK |
1985 | config = nbd_alloc_config(); |
1986 | if (IS_ERR(config)) { | |
e46c7287 | 1987 | mutex_unlock(&nbd->config_lock); |
c6a4759e | 1988 | nbd_put(nbd); |
1243172d | 1989 | pr_err("couldn't allocate config\n"); |
c55b2b98 | 1990 | return PTR_ERR(config); |
e46c7287 | 1991 | } |
c55b2b98 | 1992 | nbd->config = config; |
e46c7287 | 1993 | refcount_set(&nbd->config_refs, 1); |
ec76a7b9 | 1994 | set_bit(NBD_RT_BOUND, &config->runtime_flags); |
e46c7287 | 1995 | |
4ddeaae8 MC |
1996 | ret = nbd_genl_size_set(info, nbd); |
1997 | if (ret) | |
1998 | goto out; | |
1999 | ||
55313e92 MC |
2000 | if (info->attrs[NBD_ATTR_TIMEOUT]) |
2001 | nbd_set_cmd_timeout(nbd, | |
2002 | nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT])); | |
560bc4b3 JB |
2003 | if (info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]) { |
2004 | config->dead_conn_timeout = | |
2005 | nla_get_u64(info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]); | |
2006 | config->dead_conn_timeout *= HZ; | |
2007 | } | |
e46c7287 JB |
2008 | if (info->attrs[NBD_ATTR_SERVER_FLAGS]) |
2009 | config->flags = | |
2010 | nla_get_u64(info->attrs[NBD_ATTR_SERVER_FLAGS]); | |
a2c97909 JB |
2011 | if (info->attrs[NBD_ATTR_CLIENT_FLAGS]) { |
2012 | u64 flags = nla_get_u64(info->attrs[NBD_ATTR_CLIENT_FLAGS]); | |
2013 | if (flags & NBD_CFLAG_DESTROY_ON_DISCONNECT) { | |
c9a2f90f JB |
2014 | /* |
2015 | * We have 1 ref to keep the device around, and then 1 | |
2016 | * ref for our current operation here, which will be | |
2017 | * inherited by the config. If we already have | |
2018 | * DESTROY_ON_DISCONNECT set then we know we don't have | |
2019 | * that extra ref already held so we don't need the | |
2020 | * put_dev. | |
2021 | */ | |
2022 | if (!test_and_set_bit(NBD_DESTROY_ON_DISCONNECT, | |
2023 | &nbd->flags)) | |
2024 | put_dev = true; | |
8454d685 | 2025 | } else { |
c9a2f90f JB |
2026 | if (test_and_clear_bit(NBD_DESTROY_ON_DISCONNECT, |
2027 | &nbd->flags)) | |
2028 | refcount_inc(&nbd->refs); | |
a2c97909 | 2029 | } |
08ba91ee | 2030 | if (flags & NBD_CFLAG_DISCONNECT_ON_CLOSE) { |
ec76a7b9 | 2031 | set_bit(NBD_RT_DISCONNECT_ON_CLOSE, |
08ba91ee DRK |
2032 | &config->runtime_flags); |
2033 | } | |
a2c97909 JB |
2034 | } |
2035 | ||
e46c7287 JB |
2036 | if (info->attrs[NBD_ATTR_SOCKETS]) { |
2037 | struct nlattr *attr; | |
2038 | int rem, fd; | |
2039 | ||
2040 | nla_for_each_nested(attr, info->attrs[NBD_ATTR_SOCKETS], | |
2041 | rem) { | |
2042 | struct nlattr *socks[NBD_SOCK_MAX+1]; | |
2043 | ||
2044 | if (nla_type(attr) != NBD_SOCK_ITEM) { | |
1243172d | 2045 | pr_err("socks must be embedded in a SOCK_ITEM attr\n"); |
e46c7287 JB |
2046 | ret = -EINVAL; |
2047 | goto out; | |
2048 | } | |
8cb08174 JB |
2049 | ret = nla_parse_nested_deprecated(socks, NBD_SOCK_MAX, |
2050 | attr, | |
2051 | nbd_sock_policy, | |
2052 | info->extack); | |
e46c7287 | 2053 | if (ret != 0) { |
1243172d | 2054 | pr_err("error processing sock list\n"); |
e46c7287 JB |
2055 | ret = -EINVAL; |
2056 | goto out; | |
2057 | } | |
2058 | if (!socks[NBD_SOCK_FD]) | |
2059 | continue; | |
2060 | fd = (int)nla_get_u32(socks[NBD_SOCK_FD]); | |
2061 | ret = nbd_add_socket(nbd, fd, true); | |
2062 | if (ret) | |
2063 | goto out; | |
2064 | } | |
2065 | } | |
2066 | ret = nbd_start_device(nbd); | |
6497ef8d PKK |
2067 | if (ret) |
2068 | goto out; | |
2069 | if (info->attrs[NBD_ATTR_BACKEND_IDENTIFIER]) { | |
2070 | nbd->backend = nla_strdup(info->attrs[NBD_ATTR_BACKEND_IDENTIFIER], | |
2071 | GFP_KERNEL); | |
2072 | if (!nbd->backend) { | |
2073 | ret = -ENOMEM; | |
2074 | goto out; | |
2075 | } | |
2076 | } | |
2077 | ret = device_create_file(disk_to_dev(nbd->disk), &backend_attr); | |
2078 | if (ret) { | |
2079 | dev_err(disk_to_dev(nbd->disk), | |
2080 | "device_create_file failed for backend!\n"); | |
2081 | goto out; | |
2082 | } | |
2083 | set_bit(NBD_RT_HAS_BACKEND_FILE, &config->runtime_flags); | |
e46c7287 JB |
2084 | out: |
2085 | mutex_unlock(&nbd->config_lock); | |
2086 | if (!ret) { | |
ec76a7b9 | 2087 | set_bit(NBD_RT_HAS_CONFIG_REF, &config->runtime_flags); |
e46c7287 JB |
2088 | refcount_inc(&nbd->config_refs); |
2089 | nbd_connect_reply(info, nbd->index); | |
2090 | } | |
2091 | nbd_config_put(nbd); | |
a2c97909 JB |
2092 | if (put_dev) |
2093 | nbd_put(nbd); | |
e46c7287 JB |
2094 | return ret; |
2095 | } | |
2096 | ||
08ba91ee DRK |
2097 | static void nbd_disconnect_and_put(struct nbd_device *nbd) |
2098 | { | |
2099 | mutex_lock(&nbd->config_lock); | |
2100 | nbd_disconnect(nbd); | |
cddce011 | 2101 | sock_shutdown(nbd); |
491bf8f2 | 2102 | wake_up(&nbd->config->conn_wait); |
e9e006f5 | 2103 | /* |
e2daec48 | 2104 | * Make sure recv thread has finished, we can safely call nbd_clear_que() |
cddce011 | 2105 | * to cancel the inflight I/Os. |
e9e006f5 | 2106 | */ |
e2daec48 | 2107 | flush_workqueue(nbd->recv_workq); |
cddce011 XY |
2108 | nbd_clear_que(nbd); |
2109 | nbd->task_setup = NULL; | |
2110 | mutex_unlock(&nbd->config_lock); | |
2111 | ||
ec76a7b9 | 2112 | if (test_and_clear_bit(NBD_RT_HAS_CONFIG_REF, |
08ba91ee DRK |
2113 | &nbd->config->runtime_flags)) |
2114 | nbd_config_put(nbd); | |
2115 | } | |
2116 | ||
e46c7287 JB |
2117 | static int nbd_genl_disconnect(struct sk_buff *skb, struct genl_info *info) |
2118 | { | |
2119 | struct nbd_device *nbd; | |
2120 | int index; | |
2121 | ||
2122 | if (!netlink_capable(skb, CAP_SYS_ADMIN)) | |
2123 | return -EPERM; | |
2124 | ||
2125 | if (!info->attrs[NBD_ATTR_INDEX]) { | |
1243172d | 2126 | pr_err("must specify an index to disconnect\n"); |
e46c7287 JB |
2127 | return -EINVAL; |
2128 | } | |
2129 | index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]); | |
2130 | mutex_lock(&nbd_index_mutex); | |
2131 | nbd = idr_find(&nbd_index_idr, index); | |
e46c7287 | 2132 | if (!nbd) { |
c6a4759e | 2133 | mutex_unlock(&nbd_index_mutex); |
1243172d | 2134 | pr_err("couldn't find device at index %d\n", index); |
e46c7287 JB |
2135 | return -EINVAL; |
2136 | } | |
c6a4759e JB |
2137 | if (!refcount_inc_not_zero(&nbd->refs)) { |
2138 | mutex_unlock(&nbd_index_mutex); | |
1243172d | 2139 | pr_err("device at index %d is going down\n", index); |
c6a4759e JB |
2140 | return -EINVAL; |
2141 | } | |
2142 | mutex_unlock(&nbd_index_mutex); | |
bedf78c4 SK |
2143 | if (!refcount_inc_not_zero(&nbd->config_refs)) |
2144 | goto put_nbd; | |
08ba91ee | 2145 | nbd_disconnect_and_put(nbd); |
e46c7287 | 2146 | nbd_config_put(nbd); |
bedf78c4 | 2147 | put_nbd: |
c6a4759e | 2148 | nbd_put(nbd); |
e46c7287 JB |
2149 | return 0; |
2150 | } | |
2151 | ||
b7aa3d39 JB |
2152 | static int nbd_genl_reconfigure(struct sk_buff *skb, struct genl_info *info) |
2153 | { | |
2154 | struct nbd_device *nbd = NULL; | |
2155 | struct nbd_config *config; | |
2156 | int index; | |
08ba91ee | 2157 | int ret = 0; |
a2c97909 | 2158 | bool put_dev = false; |
b7aa3d39 JB |
2159 | |
2160 | if (!netlink_capable(skb, CAP_SYS_ADMIN)) | |
2161 | return -EPERM; | |
2162 | ||
2163 | if (!info->attrs[NBD_ATTR_INDEX]) { | |
1243172d | 2164 | pr_err("must specify a device to reconfigure\n"); |
b7aa3d39 JB |
2165 | return -EINVAL; |
2166 | } | |
2167 | index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]); | |
2168 | mutex_lock(&nbd_index_mutex); | |
2169 | nbd = idr_find(&nbd_index_idr, index); | |
b7aa3d39 | 2170 | if (!nbd) { |
c6a4759e | 2171 | mutex_unlock(&nbd_index_mutex); |
1243172d | 2172 | pr_err("couldn't find a device at index %d\n", index); |
b7aa3d39 JB |
2173 | return -EINVAL; |
2174 | } | |
6497ef8d PKK |
2175 | if (nbd->backend) { |
2176 | if (info->attrs[NBD_ATTR_BACKEND_IDENTIFIER]) { | |
2177 | if (nla_strcmp(info->attrs[NBD_ATTR_BACKEND_IDENTIFIER], | |
2178 | nbd->backend)) { | |
2179 | mutex_unlock(&nbd_index_mutex); | |
2180 | dev_err(nbd_to_dev(nbd), | |
2181 | "backend image doesn't match with %s\n", | |
2182 | nbd->backend); | |
2183 | return -EINVAL; | |
2184 | } | |
2185 | } else { | |
2186 | mutex_unlock(&nbd_index_mutex); | |
2187 | dev_err(nbd_to_dev(nbd), "must specify backend\n"); | |
2188 | return -EINVAL; | |
2189 | } | |
2190 | } | |
c6a4759e JB |
2191 | if (!refcount_inc_not_zero(&nbd->refs)) { |
2192 | mutex_unlock(&nbd_index_mutex); | |
1243172d | 2193 | pr_err("device at index %d is going down\n", index); |
c6a4759e JB |
2194 | return -EINVAL; |
2195 | } | |
2196 | mutex_unlock(&nbd_index_mutex); | |
b7aa3d39 JB |
2197 | |
2198 | if (!refcount_inc_not_zero(&nbd->config_refs)) { | |
2199 | dev_err(nbd_to_dev(nbd), | |
2200 | "not configured, cannot reconfigure\n"); | |
c6a4759e | 2201 | nbd_put(nbd); |
b7aa3d39 JB |
2202 | return -EINVAL; |
2203 | } | |
2204 | ||
2205 | mutex_lock(&nbd->config_lock); | |
2206 | config = nbd->config; | |
ec76a7b9 | 2207 | if (!test_bit(NBD_RT_BOUND, &config->runtime_flags) || |
0c98057b | 2208 | !nbd->pid) { |
b7aa3d39 JB |
2209 | dev_err(nbd_to_dev(nbd), |
2210 | "not configured, cannot reconfigure\n"); | |
08ba91ee | 2211 | ret = -EINVAL; |
b7aa3d39 JB |
2212 | goto out; |
2213 | } | |
2214 | ||
4ddeaae8 MC |
2215 | ret = nbd_genl_size_set(info, nbd); |
2216 | if (ret) | |
2217 | goto out; | |
2218 | ||
55313e92 MC |
2219 | if (info->attrs[NBD_ATTR_TIMEOUT]) |
2220 | nbd_set_cmd_timeout(nbd, | |
2221 | nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT])); | |
560bc4b3 JB |
2222 | if (info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]) { |
2223 | config->dead_conn_timeout = | |
2224 | nla_get_u64(info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]); | |
2225 | config->dead_conn_timeout *= HZ; | |
2226 | } | |
a2c97909 JB |
2227 | if (info->attrs[NBD_ATTR_CLIENT_FLAGS]) { |
2228 | u64 flags = nla_get_u64(info->attrs[NBD_ATTR_CLIENT_FLAGS]); | |
2229 | if (flags & NBD_CFLAG_DESTROY_ON_DISCONNECT) { | |
c9a2f90f JB |
2230 | if (!test_and_set_bit(NBD_DESTROY_ON_DISCONNECT, |
2231 | &nbd->flags)) | |
a2c97909 JB |
2232 | put_dev = true; |
2233 | } else { | |
c9a2f90f JB |
2234 | if (test_and_clear_bit(NBD_DESTROY_ON_DISCONNECT, |
2235 | &nbd->flags)) | |
a2c97909 JB |
2236 | refcount_inc(&nbd->refs); |
2237 | } | |
08ba91ee DRK |
2238 | |
2239 | if (flags & NBD_CFLAG_DISCONNECT_ON_CLOSE) { | |
ec76a7b9 | 2240 | set_bit(NBD_RT_DISCONNECT_ON_CLOSE, |
08ba91ee DRK |
2241 | &config->runtime_flags); |
2242 | } else { | |
ec76a7b9 | 2243 | clear_bit(NBD_RT_DISCONNECT_ON_CLOSE, |
08ba91ee DRK |
2244 | &config->runtime_flags); |
2245 | } | |
a2c97909 | 2246 | } |
b7aa3d39 JB |
2247 | |
2248 | if (info->attrs[NBD_ATTR_SOCKETS]) { | |
2249 | struct nlattr *attr; | |
2250 | int rem, fd; | |
2251 | ||
2252 | nla_for_each_nested(attr, info->attrs[NBD_ATTR_SOCKETS], | |
2253 | rem) { | |
2254 | struct nlattr *socks[NBD_SOCK_MAX+1]; | |
2255 | ||
2256 | if (nla_type(attr) != NBD_SOCK_ITEM) { | |
1243172d | 2257 | pr_err("socks must be embedded in a SOCK_ITEM attr\n"); |
b7aa3d39 JB |
2258 | ret = -EINVAL; |
2259 | goto out; | |
2260 | } | |
8cb08174 JB |
2261 | ret = nla_parse_nested_deprecated(socks, NBD_SOCK_MAX, |
2262 | attr, | |
2263 | nbd_sock_policy, | |
2264 | info->extack); | |
b7aa3d39 | 2265 | if (ret != 0) { |
1243172d | 2266 | pr_err("error processing sock list\n"); |
b7aa3d39 JB |
2267 | ret = -EINVAL; |
2268 | goto out; | |
2269 | } | |
2270 | if (!socks[NBD_SOCK_FD]) | |
2271 | continue; | |
2272 | fd = (int)nla_get_u32(socks[NBD_SOCK_FD]); | |
2273 | ret = nbd_reconnect_socket(nbd, fd); | |
2274 | if (ret) { | |
2275 | if (ret == -ENOSPC) | |
2276 | ret = 0; | |
2277 | goto out; | |
2278 | } | |
2279 | dev_info(nbd_to_dev(nbd), "reconnected socket\n"); | |
2280 | } | |
2281 | } | |
2282 | out: | |
2283 | mutex_unlock(&nbd->config_lock); | |
2284 | nbd_config_put(nbd); | |
c6a4759e | 2285 | nbd_put(nbd); |
a2c97909 JB |
2286 | if (put_dev) |
2287 | nbd_put(nbd); | |
b7aa3d39 JB |
2288 | return ret; |
2289 | } | |
2290 | ||
66a9b928 | 2291 | static const struct genl_small_ops nbd_connect_genl_ops[] = { |
e46c7287 JB |
2292 | { |
2293 | .cmd = NBD_CMD_CONNECT, | |
ef6243ac | 2294 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
e46c7287 JB |
2295 | .doit = nbd_genl_connect, |
2296 | }, | |
2297 | { | |
2298 | .cmd = NBD_CMD_DISCONNECT, | |
ef6243ac | 2299 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
e46c7287 JB |
2300 | .doit = nbd_genl_disconnect, |
2301 | }, | |
b7aa3d39 JB |
2302 | { |
2303 | .cmd = NBD_CMD_RECONFIGURE, | |
ef6243ac | 2304 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
b7aa3d39 JB |
2305 | .doit = nbd_genl_reconfigure, |
2306 | }, | |
47d902b9 JB |
2307 | { |
2308 | .cmd = NBD_CMD_STATUS, | |
ef6243ac | 2309 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
47d902b9 JB |
2310 | .doit = nbd_genl_status, |
2311 | }, | |
e46c7287 JB |
2312 | }; |
2313 | ||
799f9a38 JB |
2314 | static const struct genl_multicast_group nbd_mcast_grps[] = { |
2315 | { .name = NBD_GENL_MCAST_GROUP_NAME, }, | |
2316 | }; | |
2317 | ||
e46c7287 JB |
2318 | static struct genl_family nbd_genl_family __ro_after_init = { |
2319 | .hdrsize = 0, | |
2320 | .name = NBD_GENL_FAMILY_NAME, | |
2321 | .version = NBD_GENL_VERSION, | |
2322 | .module = THIS_MODULE, | |
66a9b928 JK |
2323 | .small_ops = nbd_connect_genl_ops, |
2324 | .n_small_ops = ARRAY_SIZE(nbd_connect_genl_ops), | |
9c5d03d3 | 2325 | .resv_start_op = NBD_CMD_STATUS + 1, |
e46c7287 | 2326 | .maxattr = NBD_ATTR_MAX, |
3b0f31f2 | 2327 | .policy = nbd_attr_policy, |
799f9a38 JB |
2328 | .mcgrps = nbd_mcast_grps, |
2329 | .n_mcgrps = ARRAY_SIZE(nbd_mcast_grps), | |
e46c7287 JB |
2330 | }; |
2331 | ||
47d902b9 JB |
2332 | static int populate_nbd_status(struct nbd_device *nbd, struct sk_buff *reply) |
2333 | { | |
2334 | struct nlattr *dev_opt; | |
2335 | u8 connected = 0; | |
2336 | int ret; | |
2337 | ||
2338 | /* This is a little racey, but for status it's ok. The | |
2339 | * reason we don't take a ref here is because we can't | |
2340 | * take a ref in the index == -1 case as we would need | |
2341 | * to put under the nbd_index_mutex, which could | |
2342 | * deadlock if we are configured to remove ourselves | |
2343 | * once we're disconnected. | |
2344 | */ | |
2345 | if (refcount_read(&nbd->config_refs)) | |
2346 | connected = 1; | |
ae0be8de | 2347 | dev_opt = nla_nest_start_noflag(reply, NBD_DEVICE_ITEM); |
47d902b9 JB |
2348 | if (!dev_opt) |
2349 | return -EMSGSIZE; | |
2350 | ret = nla_put_u32(reply, NBD_DEVICE_INDEX, nbd->index); | |
2351 | if (ret) | |
2352 | return -EMSGSIZE; | |
2353 | ret = nla_put_u8(reply, NBD_DEVICE_CONNECTED, | |
2354 | connected); | |
2355 | if (ret) | |
2356 | return -EMSGSIZE; | |
2357 | nla_nest_end(reply, dev_opt); | |
2358 | return 0; | |
2359 | } | |
2360 | ||
2361 | static int status_cb(int id, void *ptr, void *data) | |
2362 | { | |
2363 | struct nbd_device *nbd = ptr; | |
2364 | return populate_nbd_status(nbd, (struct sk_buff *)data); | |
2365 | } | |
2366 | ||
2367 | static int nbd_genl_status(struct sk_buff *skb, struct genl_info *info) | |
2368 | { | |
2369 | struct nlattr *dev_list; | |
2370 | struct sk_buff *reply; | |
2371 | void *reply_head; | |
2372 | size_t msg_size; | |
2373 | int index = -1; | |
2374 | int ret = -ENOMEM; | |
2375 | ||
2376 | if (info->attrs[NBD_ATTR_INDEX]) | |
2377 | index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]); | |
2378 | ||
2379 | mutex_lock(&nbd_index_mutex); | |
2380 | ||
2381 | msg_size = nla_total_size(nla_attr_size(sizeof(u32)) + | |
2382 | nla_attr_size(sizeof(u8))); | |
2383 | msg_size *= (index == -1) ? nbd_total_devices : 1; | |
2384 | ||
2385 | reply = genlmsg_new(msg_size, GFP_KERNEL); | |
2386 | if (!reply) | |
2387 | goto out; | |
2388 | reply_head = genlmsg_put_reply(reply, info, &nbd_genl_family, 0, | |
2389 | NBD_CMD_STATUS); | |
2390 | if (!reply_head) { | |
2391 | nlmsg_free(reply); | |
2392 | goto out; | |
2393 | } | |
2394 | ||
ae0be8de | 2395 | dev_list = nla_nest_start_noflag(reply, NBD_ATTR_DEVICE_LIST); |
47d902b9 JB |
2396 | if (index == -1) { |
2397 | ret = idr_for_each(&nbd_index_idr, &status_cb, reply); | |
2398 | if (ret) { | |
2399 | nlmsg_free(reply); | |
2400 | goto out; | |
2401 | } | |
2402 | } else { | |
2403 | struct nbd_device *nbd; | |
2404 | nbd = idr_find(&nbd_index_idr, index); | |
2405 | if (nbd) { | |
2406 | ret = populate_nbd_status(nbd, reply); | |
2407 | if (ret) { | |
2408 | nlmsg_free(reply); | |
2409 | goto out; | |
2410 | } | |
2411 | } | |
2412 | } | |
2413 | nla_nest_end(reply, dev_list); | |
2414 | genlmsg_end(reply, reply_head); | |
cd46eb89 | 2415 | ret = genlmsg_reply(reply, info); |
47d902b9 JB |
2416 | out: |
2417 | mutex_unlock(&nbd_index_mutex); | |
2418 | return ret; | |
2419 | } | |
2420 | ||
e46c7287 JB |
2421 | static void nbd_connect_reply(struct genl_info *info, int index) |
2422 | { | |
2423 | struct sk_buff *skb; | |
2424 | void *msg_head; | |
2425 | int ret; | |
2426 | ||
2427 | skb = genlmsg_new(nla_total_size(sizeof(u32)), GFP_KERNEL); | |
2428 | if (!skb) | |
2429 | return; | |
2430 | msg_head = genlmsg_put_reply(skb, info, &nbd_genl_family, 0, | |
2431 | NBD_CMD_CONNECT); | |
2432 | if (!msg_head) { | |
2433 | nlmsg_free(skb); | |
2434 | return; | |
2435 | } | |
2436 | ret = nla_put_u32(skb, NBD_ATTR_INDEX, index); | |
2437 | if (ret) { | |
2438 | nlmsg_free(skb); | |
2439 | return; | |
2440 | } | |
2441 | genlmsg_end(skb, msg_head); | |
2442 | genlmsg_reply(skb, info); | |
2443 | } | |
1da177e4 | 2444 | |
799f9a38 JB |
2445 | static void nbd_mcast_index(int index) |
2446 | { | |
2447 | struct sk_buff *skb; | |
2448 | void *msg_head; | |
2449 | int ret; | |
2450 | ||
2451 | skb = genlmsg_new(nla_total_size(sizeof(u32)), GFP_KERNEL); | |
2452 | if (!skb) | |
2453 | return; | |
2454 | msg_head = genlmsg_put(skb, 0, 0, &nbd_genl_family, 0, | |
2455 | NBD_CMD_LINK_DEAD); | |
2456 | if (!msg_head) { | |
2457 | nlmsg_free(skb); | |
2458 | return; | |
2459 | } | |
2460 | ret = nla_put_u32(skb, NBD_ATTR_INDEX, index); | |
2461 | if (ret) { | |
2462 | nlmsg_free(skb); | |
2463 | return; | |
2464 | } | |
2465 | genlmsg_end(skb, msg_head); | |
2466 | genlmsg_multicast(&nbd_genl_family, skb, 0, 0, GFP_KERNEL); | |
2467 | } | |
2468 | ||
2469 | static void nbd_dead_link_work(struct work_struct *work) | |
2470 | { | |
2471 | struct link_dead_args *args = container_of(work, struct link_dead_args, | |
2472 | work); | |
2473 | nbd_mcast_index(args->index); | |
2474 | kfree(args); | |
2475 | } | |
2476 | ||
1da177e4 LT |
2477 | static int __init nbd_init(void) |
2478 | { | |
1da177e4 LT |
2479 | int i; |
2480 | ||
5b7b18cc | 2481 | BUILD_BUG_ON(sizeof(struct nbd_request) != 28); |
1da177e4 | 2482 | |
d71a6d73 | 2483 | if (max_part < 0) { |
1243172d | 2484 | pr_err("max_part must be >= 0\n"); |
d71a6d73 LV |
2485 | return -EINVAL; |
2486 | } | |
2487 | ||
2488 | part_shift = 0; | |
5988ce23 | 2489 | if (max_part > 0) { |
d71a6d73 LV |
2490 | part_shift = fls(max_part); |
2491 | ||
5988ce23 NK |
2492 | /* |
2493 | * Adjust max_part according to part_shift as it is exported | |
2494 | * to user space so that user can know the max number of | |
2495 | * partition kernel should be able to manage. | |
2496 | * | |
2497 | * Note that -1 is required because partition 0 is reserved | |
2498 | * for the whole disk. | |
2499 | */ | |
2500 | max_part = (1UL << part_shift) - 1; | |
2501 | } | |
2502 | ||
3b271082 NK |
2503 | if ((1UL << part_shift) > DISK_MAX_PARTS) |
2504 | return -EINVAL; | |
2505 | ||
2506 | if (nbds_max > 1UL << (MINORBITS - part_shift)) | |
2507 | return -EINVAL; | |
2508 | ||
e9e006f5 | 2509 | if (register_blkdev(NBD_MAJOR, "nbd")) |
b0d9111a | 2510 | return -EIO; |
1da177e4 | 2511 | |
68c9417b HT |
2512 | nbd_del_wq = alloc_workqueue("nbd-del", WQ_UNBOUND, 0); |
2513 | if (!nbd_del_wq) { | |
2514 | unregister_blkdev(NBD_MAJOR, "nbd"); | |
2515 | return -ENOMEM; | |
2516 | } | |
2517 | ||
e46c7287 | 2518 | if (genl_register_family(&nbd_genl_family)) { |
68c9417b | 2519 | destroy_workqueue(nbd_del_wq); |
e46c7287 | 2520 | unregister_blkdev(NBD_MAJOR, "nbd"); |
e46c7287 JB |
2521 | return -EINVAL; |
2522 | } | |
30d53d9c MP |
2523 | nbd_dbg_init(); |
2524 | ||
b0d9111a | 2525 | for (i = 0; i < nbds_max; i++) |
6e4df4c6 | 2526 | nbd_dev_add(i, 1); |
b0d9111a JB |
2527 | return 0; |
2528 | } | |
1da177e4 | 2529 | |
b0d9111a JB |
2530 | static int nbd_exit_cb(int id, void *ptr, void *data) |
2531 | { | |
c6a4759e | 2532 | struct list_head *list = (struct list_head *)data; |
b0d9111a | 2533 | struct nbd_device *nbd = ptr; |
c6a4759e | 2534 | |
68c9417b HT |
2535 | /* Skip nbd that is being removed asynchronously */ |
2536 | if (refcount_read(&nbd->refs)) | |
2537 | list_add_tail(&nbd->list, list); | |
2538 | ||
1da177e4 | 2539 | return 0; |
1da177e4 LT |
2540 | } |
2541 | ||
2542 | static void __exit nbd_cleanup(void) | |
2543 | { | |
c6a4759e JB |
2544 | struct nbd_device *nbd; |
2545 | LIST_HEAD(del_list); | |
2546 | ||
06c4da89 YK |
2547 | /* |
2548 | * Unregister netlink interface prior to waiting | |
2549 | * for the completion of netlink commands. | |
2550 | */ | |
2551 | genl_unregister_family(&nbd_genl_family); | |
2552 | ||
30d53d9c MP |
2553 | nbd_dbg_close(); |
2554 | ||
c6a4759e JB |
2555 | mutex_lock(&nbd_index_mutex); |
2556 | idr_for_each(&nbd_index_idr, &nbd_exit_cb, &del_list); | |
2557 | mutex_unlock(&nbd_index_mutex); | |
2558 | ||
60ae36ad JB |
2559 | while (!list_empty(&del_list)) { |
2560 | nbd = list_first_entry(&del_list, struct nbd_device, list); | |
2561 | list_del_init(&nbd->list); | |
c55b2b98 | 2562 | if (refcount_read(&nbd->config_refs)) |
1243172d | 2563 | pr_err("possibly leaking nbd_config (ref %d)\n", |
c55b2b98 | 2564 | refcount_read(&nbd->config_refs)); |
60ae36ad | 2565 | if (refcount_read(&nbd->refs) != 1) |
1243172d | 2566 | pr_err("possibly leaking a device\n"); |
c6a4759e | 2567 | nbd_put(nbd); |
c6a4759e JB |
2568 | } |
2569 | ||
68c9417b HT |
2570 | /* Also wait for nbd_dev_remove_work() completes */ |
2571 | destroy_workqueue(nbd_del_wq); | |
2572 | ||
b0d9111a | 2573 | idr_destroy(&nbd_index_idr); |
1da177e4 | 2574 | unregister_blkdev(NBD_MAJOR, "nbd"); |
1da177e4 LT |
2575 | } |
2576 | ||
2577 | module_init(nbd_init); | |
2578 | module_exit(nbd_cleanup); | |
2579 | ||
2580 | MODULE_DESCRIPTION("Network Block Device"); | |
2581 | MODULE_LICENSE("GPL"); | |
2582 | ||
40be0c28 | 2583 | module_param(nbds_max, int, 0444); |
d71a6d73 LV |
2584 | MODULE_PARM_DESC(nbds_max, "number of network block devices to initialize (default: 16)"); |
2585 | module_param(max_part, int, 0444); | |
7a8362a0 | 2586 | MODULE_PARM_DESC(max_part, "number of partitions per device (default: 16)"); |