Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Network block device - make block devices work over TCP |
| 3 | * |
| 4 | * Note that you can not swap over this thing, yet. Seems to work but |
| 5 | * deadlocks sometimes - you can not swap over TCP in general. |
| 6 | * |
Pavel Machek | a253129 | 2010-07-18 14:27:13 +0200 | [diff] [blame] | 7 | * Copyright 1997-2000, 2008 Pavel Machek <pavel@ucw.cz> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Parts copyright 2001 Steven Whitehouse <steve@chygwyn.com> |
| 9 | * |
Pavel Machek | dbf492d | 2006-06-25 05:47:42 -0700 | [diff] [blame] | 10 | * This file is released under GPLv2 or later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
Pavel Machek | dbf492d | 2006-06-25 05:47:42 -0700 | [diff] [blame] | 12 | * (part of code stolen from loop.c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | */ |
| 14 | |
| 15 | #include <linux/major.h> |
| 16 | |
| 17 | #include <linux/blkdev.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/fs.h> |
| 22 | #include <linux/bio.h> |
| 23 | #include <linux/stat.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/file.h> |
| 26 | #include <linux/ioctl.h> |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 27 | #include <linux/mutex.h> |
Herbert Xu | 4b2f026 | 2006-01-06 00:09:47 -0800 | [diff] [blame] | 28 | #include <linux/compiler.h> |
| 29 | #include <linux/err.h> |
| 30 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 31 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <net/sock.h> |
Trond Myklebust | 91cf45f | 2007-11-12 18:10:39 -0800 | [diff] [blame] | 33 | #include <linux/net.h> |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 34 | #include <linux/kthread.h> |
Markus Pargmann | b9c495b | 2015-04-02 10:11:37 +0200 | [diff] [blame] | 35 | #include <linux/types.h> |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 36 | #include <linux/debugfs.h> |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 37 | #include <linux/blk-mq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/uaccess.h> |
| 40 | #include <asm/types.h> |
| 41 | |
| 42 | #include <linux/nbd.h> |
| 43 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 44 | struct nbd_sock { |
| 45 | struct socket *sock; |
| 46 | struct mutex tx_lock; |
| 47 | }; |
| 48 | |
Josef Bacik | 9b4a6ba | 2016-09-08 12:33:39 -0700 | [diff] [blame] | 49 | #define NBD_TIMEDOUT 0 |
| 50 | #define NBD_DISCONNECT_REQUESTED 1 |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 51 | #define NBD_DISCONNECTED 2 |
| 52 | #define NBD_RUNNING 3 |
Josef Bacik | 9b4a6ba | 2016-09-08 12:33:39 -0700 | [diff] [blame] | 53 | |
Markus Pargmann | 13e71d6 | 2015-04-02 10:11:35 +0200 | [diff] [blame] | 54 | struct nbd_device { |
Markus Pargmann | 22d109c | 2015-08-17 08:20:09 +0200 | [diff] [blame] | 55 | u32 flags; |
Josef Bacik | 9b4a6ba | 2016-09-08 12:33:39 -0700 | [diff] [blame] | 56 | unsigned long runtime_flags; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 57 | struct nbd_sock **socks; |
Markus Pargmann | 13e71d6 | 2015-04-02 10:11:35 +0200 | [diff] [blame] | 58 | int magic; |
| 59 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 60 | struct blk_mq_tag_set tag_set; |
Markus Pargmann | 13e71d6 | 2015-04-02 10:11:35 +0200 | [diff] [blame] | 61 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 62 | struct mutex config_lock; |
Markus Pargmann | 13e71d6 | 2015-04-02 10:11:35 +0200 | [diff] [blame] | 63 | struct gendisk *disk; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 64 | int num_connections; |
| 65 | atomic_t recv_threads; |
| 66 | wait_queue_head_t recv_wq; |
Markus Pargmann | 13e71d6 | 2015-04-02 10:11:35 +0200 | [diff] [blame] | 67 | int blksize; |
Markus Pargmann | b9c495b | 2015-04-02 10:11:37 +0200 | [diff] [blame] | 68 | loff_t bytesize; |
Markus Pargmann | 7e2893a | 2015-08-17 08:20:00 +0200 | [diff] [blame] | 69 | |
Markus Pargmann | 7e2893a | 2015-08-17 08:20:00 +0200 | [diff] [blame] | 70 | struct task_struct *task_recv; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 71 | struct task_struct *task_setup; |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 72 | |
| 73 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
| 74 | struct dentry *dbg_dir; |
| 75 | #endif |
Markus Pargmann | 13e71d6 | 2015-04-02 10:11:35 +0200 | [diff] [blame] | 76 | }; |
| 77 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 78 | struct nbd_cmd { |
| 79 | struct nbd_device *nbd; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 80 | struct completion send_complete; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 81 | }; |
| 82 | |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 83 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
| 84 | static struct dentry *nbd_dbg_dir; |
| 85 | #endif |
| 86 | |
| 87 | #define nbd_name(nbd) ((nbd)->disk->disk_name) |
| 88 | |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 89 | #define NBD_MAGIC 0x68797548 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Ingo van Lil | 9c7a416 | 2006-07-01 04:36:36 -0700 | [diff] [blame] | 91 | static unsigned int nbds_max = 16; |
Paul Clements | 20a8143 | 2008-02-08 04:21:51 -0800 | [diff] [blame] | 92 | static struct nbd_device *nbd_dev; |
Laurent Vivier | d71a6d7 | 2008-04-29 01:02:51 -0700 | [diff] [blame] | 93 | static int max_part; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Markus Pargmann | d18509f | 2015-04-02 10:11:38 +0200 | [diff] [blame] | 95 | static inline struct device *nbd_to_dev(struct nbd_device *nbd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
Markus Pargmann | d18509f | 2015-04-02 10:11:38 +0200 | [diff] [blame] | 97 | return disk_to_dev(nbd->disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Markus Pargmann | 37091fd | 2015-07-27 07:36:49 +0200 | [diff] [blame] | 100 | static bool nbd_is_connected(struct nbd_device *nbd) |
| 101 | { |
| 102 | return !!nbd->task_recv; |
| 103 | } |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | static const char *nbdcmd_to_ascii(int cmd) |
| 106 | { |
| 107 | switch (cmd) { |
| 108 | case NBD_CMD_READ: return "read"; |
| 109 | case NBD_CMD_WRITE: return "write"; |
| 110 | case NBD_CMD_DISC: return "disconnect"; |
Alex Bligh | 75f187a | 2013-02-27 17:05:23 -0800 | [diff] [blame] | 111 | case NBD_CMD_FLUSH: return "flush"; |
Paul Clements | a336d29 | 2012-10-04 17:16:18 -0700 | [diff] [blame] | 112 | case NBD_CMD_TRIM: return "trim/discard"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
| 114 | return "invalid"; |
| 115 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Markus Pargmann | 37091fd | 2015-07-27 07:36:49 +0200 | [diff] [blame] | 117 | static int nbd_size_clear(struct nbd_device *nbd, struct block_device *bdev) |
| 118 | { |
| 119 | bdev->bd_inode->i_size = 0; |
| 120 | set_capacity(nbd->disk, 0); |
| 121 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | static void nbd_size_update(struct nbd_device *nbd, struct block_device *bdev) |
| 127 | { |
| 128 | if (!nbd_is_connected(nbd)) |
| 129 | return; |
| 130 | |
| 131 | bdev->bd_inode->i_size = nbd->bytesize; |
| 132 | set_capacity(nbd->disk, nbd->bytesize >> 9); |
| 133 | kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE); |
| 134 | } |
| 135 | |
| 136 | static int nbd_size_set(struct nbd_device *nbd, struct block_device *bdev, |
| 137 | int blocksize, int nr_blocks) |
| 138 | { |
| 139 | int ret; |
| 140 | |
| 141 | ret = set_blocksize(bdev, blocksize); |
| 142 | if (ret) |
| 143 | return ret; |
| 144 | |
| 145 | nbd->blksize = blocksize; |
| 146 | nbd->bytesize = (loff_t)blocksize * (loff_t)nr_blocks; |
| 147 | |
| 148 | nbd_size_update(nbd, bdev); |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 153 | static void nbd_end_request(struct nbd_cmd *cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 155 | struct nbd_device *nbd = cmd->nbd; |
| 156 | struct request *req = blk_mq_rq_from_pdu(cmd); |
Kiyoshi Ueda | 097c94a | 2007-12-11 17:44:06 -0500 | [diff] [blame] | 157 | int error = req->errors ? -EIO : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 159 | dev_dbg(nbd_to_dev(nbd), "request %p: %s\n", cmd, |
Markus Pargmann | d18509f | 2015-04-02 10:11:38 +0200 | [diff] [blame] | 160 | error ? "failed" : "done"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 162 | blk_mq_complete_request(req, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
| 164 | |
Markus Pargmann | e018e75 | 2015-04-02 10:11:39 +0200 | [diff] [blame] | 165 | /* |
| 166 | * Forcibly shutdown the socket causing all listeners to error |
| 167 | */ |
Markus Pargmann | 36e47be | 2015-08-17 08:20:01 +0200 | [diff] [blame] | 168 | static void sock_shutdown(struct nbd_device *nbd) |
Paul Clements | 7fdfd40 | 2007-10-16 23:27:37 -0700 | [diff] [blame] | 169 | { |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 170 | int i; |
Josef Bacik | c261189 | 2016-09-08 12:33:38 -0700 | [diff] [blame] | 171 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 172 | if (nbd->num_connections == 0) |
Markus Pargmann | 260bbce | 2015-08-17 08:20:02 +0200 | [diff] [blame] | 173 | return; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 174 | if (test_and_set_bit(NBD_DISCONNECTED, &nbd->runtime_flags)) |
| 175 | return; |
| 176 | |
| 177 | for (i = 0; i < nbd->num_connections; i++) { |
| 178 | struct nbd_sock *nsock = nbd->socks[i]; |
| 179 | mutex_lock(&nsock->tx_lock); |
| 180 | kernel_sock_shutdown(nsock->sock, SHUT_RDWR); |
| 181 | mutex_unlock(&nsock->tx_lock); |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 182 | } |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 183 | dev_warn(disk_to_dev(nbd->disk), "shutting down sockets\n"); |
Paul Clements | 7fdfd40 | 2007-10-16 23:27:37 -0700 | [diff] [blame] | 184 | } |
| 185 | |
Josef Bacik | 0eadf37 | 2016-09-08 12:33:40 -0700 | [diff] [blame] | 186 | static enum blk_eh_timer_return nbd_xmit_timeout(struct request *req, |
| 187 | bool reserved) |
Paul Clements | 7fdfd40 | 2007-10-16 23:27:37 -0700 | [diff] [blame] | 188 | { |
Josef Bacik | 0eadf37 | 2016-09-08 12:33:40 -0700 | [diff] [blame] | 189 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req); |
| 190 | struct nbd_device *nbd = cmd->nbd; |
Paul Clements | 7fdfd40 | 2007-10-16 23:27:37 -0700 | [diff] [blame] | 191 | |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 192 | dev_err(nbd_to_dev(nbd), "Connection timed out, shutting down connection\n"); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 193 | set_bit(NBD_TIMEDOUT, &nbd->runtime_flags); |
| 194 | req->errors++; |
| 195 | |
| 196 | /* |
| 197 | * If our disconnect packet times out then we're already holding the |
| 198 | * config_lock and could deadlock here, so just set an error and return, |
| 199 | * we'll handle shutting everything down later. |
| 200 | */ |
| 201 | if (req->cmd_type == REQ_TYPE_DRV_PRIV) |
| 202 | return BLK_EH_HANDLED; |
| 203 | mutex_lock(&nbd->config_lock); |
| 204 | sock_shutdown(nbd); |
| 205 | mutex_unlock(&nbd->config_lock); |
Josef Bacik | 0eadf37 | 2016-09-08 12:33:40 -0700 | [diff] [blame] | 206 | return BLK_EH_HANDLED; |
Paul Clements | 7fdfd40 | 2007-10-16 23:27:37 -0700 | [diff] [blame] | 207 | } |
| 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | /* |
| 210 | * Send or receive packet. |
| 211 | */ |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 212 | static int sock_xmit(struct nbd_device *nbd, int index, int send, void *buf, |
| 213 | int size, int msg_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 215 | struct socket *sock = nbd->socks[index]->sock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | int result; |
| 217 | struct msghdr msg; |
| 218 | struct kvec iov; |
Mel Gorman | 7f338fe | 2012-07-31 16:44:32 -0700 | [diff] [blame] | 219 | unsigned long pflags = current->flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
Mike Snitzer | ffc41cf | 2008-04-02 13:04:47 -0700 | [diff] [blame] | 221 | if (unlikely(!sock)) { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 222 | dev_err(disk_to_dev(nbd->disk), |
WANG Cong | 7f1b90f | 2011-08-19 14:48:22 +0200 | [diff] [blame] | 223 | "Attempted %s on closed socket in sock_xmit\n", |
| 224 | (send ? "send" : "recv")); |
Mike Snitzer | ffc41cf | 2008-04-02 13:04:47 -0700 | [diff] [blame] | 225 | return -EINVAL; |
| 226 | } |
| 227 | |
Mel Gorman | 7f338fe | 2012-07-31 16:44:32 -0700 | [diff] [blame] | 228 | current->flags |= PF_MEMALLOC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | do { |
Mel Gorman | 7f338fe | 2012-07-31 16:44:32 -0700 | [diff] [blame] | 230 | sock->sk->sk_allocation = GFP_NOIO | __GFP_MEMALLOC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | iov.iov_base = buf; |
| 232 | iov.iov_len = size; |
| 233 | msg.msg_name = NULL; |
| 234 | msg.msg_namelen = 0; |
| 235 | msg.msg_control = NULL; |
| 236 | msg.msg_controllen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | msg.msg_flags = msg_flags | MSG_NOSIGNAL; |
| 238 | |
Markus Pargmann | 7e2893a | 2015-08-17 08:20:00 +0200 | [diff] [blame] | 239 | if (send) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | result = kernel_sendmsg(sock, &msg, &iov, 1, size); |
Markus Pargmann | 7e2893a | 2015-08-17 08:20:00 +0200 | [diff] [blame] | 241 | else |
Namhyung Kim | 35fbf5b | 2011-05-28 14:44:46 +0200 | [diff] [blame] | 242 | result = kernel_recvmsg(sock, &msg, &iov, 1, size, |
| 243 | msg.msg_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | if (result <= 0) { |
| 246 | if (result == 0) |
| 247 | result = -EPIPE; /* short read */ |
| 248 | break; |
| 249 | } |
| 250 | size -= result; |
| 251 | buf += result; |
| 252 | } while (size > 0); |
| 253 | |
Mel Gorman | 7f338fe | 2012-07-31 16:44:32 -0700 | [diff] [blame] | 254 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
| 256 | return result; |
| 257 | } |
| 258 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 259 | static inline int sock_send_bvec(struct nbd_device *nbd, int index, |
| 260 | struct bio_vec *bvec, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | { |
| 262 | int result; |
| 263 | void *kaddr = kmap(bvec->bv_page); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 264 | result = sock_xmit(nbd, index, 1, kaddr + bvec->bv_offset, |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 265 | bvec->bv_len, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | kunmap(bvec->bv_page); |
| 267 | return result; |
| 268 | } |
| 269 | |
Paul Clements | 7fdfd40 | 2007-10-16 23:27:37 -0700 | [diff] [blame] | 270 | /* always call with the tx_lock held */ |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 271 | static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | { |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 273 | struct request *req = blk_mq_rq_from_pdu(cmd); |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 274 | int result, flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | struct nbd_request request; |
Tejun Heo | 1011c1b | 2009-05-07 22:24:45 +0900 | [diff] [blame] | 276 | unsigned long size = blk_rq_bytes(req); |
Jens Axboe | 429a787 | 2016-11-17 12:30:37 -0700 | [diff] [blame] | 277 | struct bio *bio; |
Christoph Hellwig | 9dc6c80 | 2015-04-17 22:37:21 +0200 | [diff] [blame] | 278 | u32 type; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 279 | u32 tag = blk_mq_unique_tag(req); |
Christoph Hellwig | 9dc6c80 | 2015-04-17 22:37:21 +0200 | [diff] [blame] | 280 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 281 | if (req_op(req) == REQ_OP_DISCARD) |
Christoph Hellwig | 9dc6c80 | 2015-04-17 22:37:21 +0200 | [diff] [blame] | 282 | type = NBD_CMD_TRIM; |
Mike Christie | 3a5e02c | 2016-06-05 14:32:23 -0500 | [diff] [blame] | 283 | else if (req_op(req) == REQ_OP_FLUSH) |
Christoph Hellwig | 9dc6c80 | 2015-04-17 22:37:21 +0200 | [diff] [blame] | 284 | type = NBD_CMD_FLUSH; |
| 285 | else if (rq_data_dir(req) == WRITE) |
| 286 | type = NBD_CMD_WRITE; |
| 287 | else |
| 288 | type = NBD_CMD_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
Hani Benhabiles | 04cfac4 | 2014-06-06 14:38:30 -0700 | [diff] [blame] | 290 | memset(&request, 0, sizeof(request)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | request.magic = htonl(NBD_REQUEST_MAGIC); |
Christoph Hellwig | 9dc6c80 | 2015-04-17 22:37:21 +0200 | [diff] [blame] | 292 | request.type = htonl(type); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 293 | if (type != NBD_CMD_FLUSH) { |
Alex Bligh | 75f187a | 2013-02-27 17:05:23 -0800 | [diff] [blame] | 294 | request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9); |
| 295 | request.len = htonl(size); |
| 296 | } |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 297 | memcpy(request.handle, &tag, sizeof(tag)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Markus Pargmann | d18509f | 2015-04-02 10:11:38 +0200 | [diff] [blame] | 299 | dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n", |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 300 | cmd, nbdcmd_to_ascii(type), |
Markus Pargmann | d18509f | 2015-04-02 10:11:38 +0200 | [diff] [blame] | 301 | (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req)); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 302 | result = sock_xmit(nbd, index, 1, &request, sizeof(request), |
Christoph Hellwig | 9dc6c80 | 2015-04-17 22:37:21 +0200 | [diff] [blame] | 303 | (type == NBD_CMD_WRITE) ? MSG_MORE : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | if (result <= 0) { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 305 | dev_err(disk_to_dev(nbd->disk), |
WANG Cong | 7f1b90f | 2011-08-19 14:48:22 +0200 | [diff] [blame] | 306 | "Send control failed (result %d)\n", result); |
Markus Pargmann | dab5313 | 2015-04-02 10:11:40 +0200 | [diff] [blame] | 307 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | } |
| 309 | |
Jens Axboe | 429a787 | 2016-11-17 12:30:37 -0700 | [diff] [blame] | 310 | if (type != NBD_CMD_WRITE) |
| 311 | return 0; |
| 312 | |
| 313 | flags = 0; |
| 314 | bio = req->bio; |
| 315 | while (bio) { |
| 316 | struct bio *next = bio->bi_next; |
| 317 | struct bvec_iter iter; |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 318 | struct bio_vec bvec; |
Jens Axboe | 429a787 | 2016-11-17 12:30:37 -0700 | [diff] [blame] | 319 | |
| 320 | bio_for_each_segment(bvec, bio, iter) { |
| 321 | bool is_last = !next && bio_iter_last(bvec, iter); |
| 322 | |
| 323 | if (is_last) |
Jens Axboe | 6c92e69 | 2007-08-16 13:43:12 +0200 | [diff] [blame] | 324 | flags = MSG_MORE; |
Markus Pargmann | d18509f | 2015-04-02 10:11:38 +0200 | [diff] [blame] | 325 | dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n", |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 326 | cmd, bvec.bv_len); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 327 | result = sock_send_bvec(nbd, index, &bvec, flags); |
Jens Axboe | 6c92e69 | 2007-08-16 13:43:12 +0200 | [diff] [blame] | 328 | if (result <= 0) { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 329 | dev_err(disk_to_dev(nbd->disk), |
WANG Cong | 7f1b90f | 2011-08-19 14:48:22 +0200 | [diff] [blame] | 330 | "Send data failed (result %d)\n", |
| 331 | result); |
Markus Pargmann | dab5313 | 2015-04-02 10:11:40 +0200 | [diff] [blame] | 332 | return -EIO; |
Jens Axboe | 6c92e69 | 2007-08-16 13:43:12 +0200 | [diff] [blame] | 333 | } |
Jens Axboe | 429a787 | 2016-11-17 12:30:37 -0700 | [diff] [blame] | 334 | /* |
| 335 | * The completion might already have come in, |
| 336 | * so break for the last one instead of letting |
| 337 | * the iterator do it. This prevents use-after-free |
| 338 | * of the bio. |
| 339 | */ |
| 340 | if (is_last) |
| 341 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | } |
Jens Axboe | 429a787 | 2016-11-17 12:30:37 -0700 | [diff] [blame] | 343 | bio = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
| 347 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 348 | static inline int sock_recv_bvec(struct nbd_device *nbd, int index, |
| 349 | struct bio_vec *bvec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | { |
| 351 | int result; |
| 352 | void *kaddr = kmap(bvec->bv_page); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 353 | result = sock_xmit(nbd, index, 0, kaddr + bvec->bv_offset, |
| 354 | bvec->bv_len, MSG_WAITALL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | kunmap(bvec->bv_page); |
| 356 | return result; |
| 357 | } |
| 358 | |
| 359 | /* NULL returned = something went wrong, inform userspace */ |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 360 | static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd, int index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | { |
| 362 | int result; |
| 363 | struct nbd_reply reply; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 364 | struct nbd_cmd *cmd; |
| 365 | struct request *req = NULL; |
| 366 | u16 hwq; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 367 | u32 tag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | reply.magic = 0; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 370 | result = sock_xmit(nbd, index, 0, &reply, sizeof(reply), MSG_WAITALL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | if (result <= 0) { |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 372 | if (!test_bit(NBD_DISCONNECTED, &nbd->runtime_flags) && |
| 373 | !test_bit(NBD_DISCONNECT_REQUESTED, &nbd->runtime_flags)) |
| 374 | dev_err(disk_to_dev(nbd->disk), |
| 375 | "Receive control failed (result %d)\n", result); |
Markus Pargmann | 1939183 | 2015-08-17 08:20:03 +0200 | [diff] [blame] | 376 | return ERR_PTR(result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
Michal Feix | e4b57e0 | 2006-07-30 03:03:31 -0700 | [diff] [blame] | 378 | |
| 379 | if (ntohl(reply.magic) != NBD_REPLY_MAGIC) { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 380 | dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n", |
Michal Feix | e4b57e0 | 2006-07-30 03:03:31 -0700 | [diff] [blame] | 381 | (unsigned long)ntohl(reply.magic)); |
Markus Pargmann | 1939183 | 2015-08-17 08:20:03 +0200 | [diff] [blame] | 382 | return ERR_PTR(-EPROTO); |
Michal Feix | e4b57e0 | 2006-07-30 03:03:31 -0700 | [diff] [blame] | 383 | } |
| 384 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 385 | memcpy(&tag, reply.handle, sizeof(u32)); |
Herbert Xu | 4b2f026 | 2006-01-06 00:09:47 -0800 | [diff] [blame] | 386 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 387 | hwq = blk_mq_unique_tag_to_hwq(tag); |
| 388 | if (hwq < nbd->tag_set.nr_hw_queues) |
| 389 | req = blk_mq_tag_to_rq(nbd->tag_set.tags[hwq], |
| 390 | blk_mq_unique_tag_to_tag(tag)); |
| 391 | if (!req || !blk_mq_request_started(req)) { |
| 392 | dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%d) %p\n", |
| 393 | tag, req); |
| 394 | return ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 396 | cmd = blk_mq_rq_to_pdu(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | if (ntohl(reply.error)) { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 398 | dev_err(disk_to_dev(nbd->disk), "Other side returned error (%d)\n", |
WANG Cong | 7f1b90f | 2011-08-19 14:48:22 +0200 | [diff] [blame] | 399 | ntohl(reply.error)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | req->errors++; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 401 | return cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | } |
| 403 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 404 | dev_dbg(nbd_to_dev(nbd), "request %p: got reply\n", cmd); |
Christoph Hellwig | 9dc6c80 | 2015-04-17 22:37:21 +0200 | [diff] [blame] | 405 | if (rq_data_dir(req) != WRITE) { |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 406 | struct req_iterator iter; |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 407 | struct bio_vec bvec; |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 408 | |
| 409 | rq_for_each_segment(bvec, req, iter) { |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 410 | result = sock_recv_bvec(nbd, index, &bvec); |
Jens Axboe | 6c92e69 | 2007-08-16 13:43:12 +0200 | [diff] [blame] | 411 | if (result <= 0) { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 412 | dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n", |
WANG Cong | 7f1b90f | 2011-08-19 14:48:22 +0200 | [diff] [blame] | 413 | result); |
Jens Axboe | 6c92e69 | 2007-08-16 13:43:12 +0200 | [diff] [blame] | 414 | req->errors++; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 415 | return cmd; |
Jens Axboe | 6c92e69 | 2007-08-16 13:43:12 +0200 | [diff] [blame] | 416 | } |
Markus Pargmann | d18509f | 2015-04-02 10:11:38 +0200 | [diff] [blame] | 417 | dev_dbg(nbd_to_dev(nbd), "request %p: got %d bytes data\n", |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 418 | cmd, bvec.bv_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 420 | } else { |
| 421 | /* See the comment in nbd_queue_rq. */ |
| 422 | wait_for_completion(&cmd->send_complete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 424 | return cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | } |
| 426 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 427 | static ssize_t pid_show(struct device *dev, |
| 428 | struct device_attribute *attr, char *buf) |
Paul Clements | 6b39bb6 | 2006-12-06 20:40:53 -0800 | [diff] [blame] | 429 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 430 | struct gendisk *disk = dev_to_disk(dev); |
Markus Pargmann | 6521d39 | 2015-08-17 08:20:05 +0200 | [diff] [blame] | 431 | struct nbd_device *nbd = (struct nbd_device *)disk->private_data; |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 432 | |
Markus Pargmann | 6521d39 | 2015-08-17 08:20:05 +0200 | [diff] [blame] | 433 | return sprintf(buf, "%d\n", task_pid_nr(nbd->task_recv)); |
Paul Clements | 6b39bb6 | 2006-12-06 20:40:53 -0800 | [diff] [blame] | 434 | } |
| 435 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 436 | static struct device_attribute pid_attr = { |
Parag Warudkar | 01e8ef1 | 2008-10-18 20:28:50 -0700 | [diff] [blame] | 437 | .attr = { .name = "pid", .mode = S_IRUGO}, |
Paul Clements | 6b39bb6 | 2006-12-06 20:40:53 -0800 | [diff] [blame] | 438 | .show = pid_show, |
| 439 | }; |
| 440 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 441 | struct recv_thread_args { |
| 442 | struct work_struct work; |
| 443 | struct nbd_device *nbd; |
| 444 | int index; |
| 445 | }; |
| 446 | |
| 447 | static void recv_work(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | { |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 449 | struct recv_thread_args *args = container_of(work, |
| 450 | struct recv_thread_args, |
| 451 | work); |
| 452 | struct nbd_device *nbd = args->nbd; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 453 | struct nbd_cmd *cmd; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 454 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 456 | BUG_ON(nbd->magic != NBD_MAGIC); |
Markus Pargmann | 1939183 | 2015-08-17 08:20:03 +0200 | [diff] [blame] | 457 | while (1) { |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 458 | cmd = nbd_read_stat(nbd, args->index); |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 459 | if (IS_ERR(cmd)) { |
| 460 | ret = PTR_ERR(cmd); |
Markus Pargmann | 1939183 | 2015-08-17 08:20:03 +0200 | [diff] [blame] | 461 | break; |
| 462 | } |
| 463 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 464 | nbd_end_request(cmd); |
Markus Pargmann | 1939183 | 2015-08-17 08:20:03 +0200 | [diff] [blame] | 465 | } |
Paul Clements | 6b39bb6 | 2006-12-06 20:40:53 -0800 | [diff] [blame] | 466 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 467 | /* |
| 468 | * We got an error, shut everybody down if this wasn't the result of a |
| 469 | * disconnect request. |
| 470 | */ |
| 471 | if (ret && !test_bit(NBD_DISCONNECT_REQUESTED, &nbd->runtime_flags)) |
| 472 | sock_shutdown(nbd); |
| 473 | atomic_dec(&nbd->recv_threads); |
| 474 | wake_up(&nbd->recv_wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
| 476 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 477 | static void nbd_clear_req(struct request *req, void *data, bool reserved) |
| 478 | { |
| 479 | struct nbd_cmd *cmd; |
| 480 | |
| 481 | if (!blk_mq_request_started(req)) |
| 482 | return; |
| 483 | cmd = blk_mq_rq_to_pdu(req); |
| 484 | req->errors++; |
| 485 | nbd_end_request(cmd); |
| 486 | } |
| 487 | |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 488 | static void nbd_clear_que(struct nbd_device *nbd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 490 | BUG_ON(nbd->magic != NBD_MAGIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 492 | blk_mq_tagset_busy_iter(&nbd->tag_set, nbd_clear_req, NULL); |
Markus Pargmann | e78273c | 2015-08-17 08:20:04 +0200 | [diff] [blame] | 493 | dev_dbg(disk_to_dev(nbd->disk), "queue cleared\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | |
Paul Clements | 7fdfd40 | 2007-10-16 23:27:37 -0700 | [diff] [blame] | 496 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 497 | static void nbd_handle_cmd(struct nbd_cmd *cmd, int index) |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 498 | { |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 499 | struct request *req = blk_mq_rq_from_pdu(cmd); |
| 500 | struct nbd_device *nbd = cmd->nbd; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 501 | struct nbd_sock *nsock; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 502 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 503 | if (index >= nbd->num_connections) { |
| 504 | dev_err(disk_to_dev(nbd->disk), |
| 505 | "Attempted send on invalid socket\n"); |
| 506 | goto error_out; |
| 507 | } |
| 508 | |
| 509 | if (test_bit(NBD_DISCONNECTED, &nbd->runtime_flags)) { |
| 510 | dev_err(disk_to_dev(nbd->disk), |
| 511 | "Attempted send on closed socket\n"); |
| 512 | goto error_out; |
| 513 | } |
| 514 | |
| 515 | if (req->cmd_type != REQ_TYPE_FS && |
| 516 | req->cmd_type != REQ_TYPE_DRV_PRIV) |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 517 | goto error_out; |
| 518 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 519 | if (req->cmd_type == REQ_TYPE_FS && |
| 520 | rq_data_dir(req) == WRITE && |
Christoph Hellwig | 9dc6c80 | 2015-04-17 22:37:21 +0200 | [diff] [blame] | 521 | (nbd->flags & NBD_FLAG_READ_ONLY)) { |
| 522 | dev_err(disk_to_dev(nbd->disk), |
| 523 | "Write on read-only\n"); |
| 524 | goto error_out; |
Alex Bligh | 75f187a | 2013-02-27 17:05:23 -0800 | [diff] [blame] | 525 | } |
| 526 | |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 527 | req->errors = 0; |
| 528 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 529 | nsock = nbd->socks[index]; |
| 530 | mutex_lock(&nsock->tx_lock); |
| 531 | if (unlikely(!nsock->sock)) { |
| 532 | mutex_unlock(&nsock->tx_lock); |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 533 | dev_err(disk_to_dev(nbd->disk), |
WANG Cong | 7f1b90f | 2011-08-19 14:48:22 +0200 | [diff] [blame] | 534 | "Attempted send on closed socket\n"); |
Pavel Machek | 15746fc | 2009-04-02 16:58:42 -0700 | [diff] [blame] | 535 | goto error_out; |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 536 | } |
| 537 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 538 | if (nbd_send_cmd(nbd, cmd, index) != 0) { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 539 | dev_err(disk_to_dev(nbd->disk), "Request send failed\n"); |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 540 | req->errors++; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 541 | nbd_end_request(cmd); |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 542 | } |
| 543 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 544 | mutex_unlock(&nsock->tx_lock); |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 545 | |
| 546 | return; |
| 547 | |
| 548 | error_out: |
| 549 | req->errors++; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 550 | nbd_end_request(cmd); |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 553 | static int nbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
| 554 | const struct blk_mq_queue_data *bd) |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 555 | { |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 556 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
Laurent Vivier | 48cf606 | 2008-04-29 01:02:46 -0700 | [diff] [blame] | 557 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 558 | /* |
| 559 | * Since we look at the bio's to send the request over the network we |
| 560 | * need to make sure the completion work doesn't mark this request done |
| 561 | * before we are done doing our send. This keeps us from dereferencing |
| 562 | * freed data if we have particularly fast completions (ie we get the |
| 563 | * completion before we exit sock_xmit on the last bvec) or in the case |
| 564 | * that the server is misbehaving (or there was an error) before we're |
| 565 | * done sending everything over the wire. |
| 566 | */ |
| 567 | init_completion(&cmd->send_complete); |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 568 | blk_mq_start_request(bd->rq); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 569 | nbd_handle_cmd(cmd, hctx->queue_num); |
| 570 | complete(&cmd->send_complete); |
| 571 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 572 | return BLK_MQ_RQ_QUEUE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 575 | static int nbd_add_socket(struct nbd_device *nbd, struct socket *sock) |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 576 | { |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 577 | struct nbd_sock **socks; |
| 578 | struct nbd_sock *nsock; |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 579 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 580 | if (!nbd->task_setup) |
| 581 | nbd->task_setup = current; |
| 582 | if (nbd->task_setup != current) { |
| 583 | dev_err(disk_to_dev(nbd->disk), |
| 584 | "Device being setup by another task"); |
| 585 | return -EINVAL; |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 586 | } |
| 587 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 588 | socks = krealloc(nbd->socks, (nbd->num_connections + 1) * |
| 589 | sizeof(struct nbd_sock *), GFP_KERNEL); |
| 590 | if (!socks) |
| 591 | return -ENOMEM; |
| 592 | nsock = kzalloc(sizeof(struct nbd_sock), GFP_KERNEL); |
| 593 | if (!nsock) |
| 594 | return -ENOMEM; |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 595 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 596 | nbd->socks = socks; |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 597 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 598 | mutex_init(&nsock->tx_lock); |
| 599 | nsock->sock = sock; |
| 600 | socks[nbd->num_connections++] = nsock; |
| 601 | |
| 602 | return 0; |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 603 | } |
| 604 | |
Markus Pargmann | 0e4f0f6 | 2015-10-29 12:04:51 +0100 | [diff] [blame] | 605 | /* Reset all properties of an NBD device */ |
| 606 | static void nbd_reset(struct nbd_device *nbd) |
| 607 | { |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 608 | int i; |
| 609 | |
| 610 | for (i = 0; i < nbd->num_connections; i++) |
| 611 | kfree(nbd->socks[i]); |
| 612 | kfree(nbd->socks); |
| 613 | nbd->socks = NULL; |
Josef Bacik | 9b4a6ba | 2016-09-08 12:33:39 -0700 | [diff] [blame] | 614 | nbd->runtime_flags = 0; |
Markus Pargmann | 0e4f0f6 | 2015-10-29 12:04:51 +0100 | [diff] [blame] | 615 | nbd->blksize = 1024; |
| 616 | nbd->bytesize = 0; |
| 617 | set_capacity(nbd->disk, 0); |
| 618 | nbd->flags = 0; |
Josef Bacik | 0eadf37 | 2016-09-08 12:33:40 -0700 | [diff] [blame] | 619 | nbd->tag_set.timeout = 0; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 620 | nbd->num_connections = 0; |
| 621 | nbd->task_setup = NULL; |
Markus Pargmann | 0e4f0f6 | 2015-10-29 12:04:51 +0100 | [diff] [blame] | 622 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); |
Markus Pargmann | 0e4f0f6 | 2015-10-29 12:04:51 +0100 | [diff] [blame] | 623 | } |
| 624 | |
| 625 | static void nbd_bdev_reset(struct block_device *bdev) |
| 626 | { |
| 627 | set_device_ro(bdev, false); |
| 628 | bdev->bd_inode->i_size = 0; |
| 629 | if (max_part > 0) { |
| 630 | blkdev_reread_part(bdev); |
| 631 | bdev->bd_invalidated = 1; |
| 632 | } |
| 633 | } |
| 634 | |
Markus Pargmann | d02cf53 | 2015-10-29 12:06:15 +0100 | [diff] [blame] | 635 | static void nbd_parse_flags(struct nbd_device *nbd, struct block_device *bdev) |
| 636 | { |
| 637 | if (nbd->flags & NBD_FLAG_READ_ONLY) |
| 638 | set_device_ro(bdev, true); |
| 639 | if (nbd->flags & NBD_FLAG_SEND_TRIM) |
| 640 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); |
| 641 | if (nbd->flags & NBD_FLAG_SEND_FLUSH) |
Jens Axboe | aafb1ee | 2016-03-30 10:10:53 -0600 | [diff] [blame] | 642 | blk_queue_write_cache(nbd->disk->queue, true, false); |
Markus Pargmann | d02cf53 | 2015-10-29 12:06:15 +0100 | [diff] [blame] | 643 | else |
Jens Axboe | aafb1ee | 2016-03-30 10:10:53 -0600 | [diff] [blame] | 644 | blk_queue_write_cache(nbd->disk->queue, false, false); |
Markus Pargmann | d02cf53 | 2015-10-29 12:06:15 +0100 | [diff] [blame] | 645 | } |
| 646 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 647 | static void send_disconnects(struct nbd_device *nbd) |
| 648 | { |
| 649 | struct nbd_request request = {}; |
| 650 | int i, ret; |
| 651 | |
| 652 | request.magic = htonl(NBD_REQUEST_MAGIC); |
| 653 | request.type = htonl(NBD_CMD_DISC); |
| 654 | |
| 655 | for (i = 0; i < nbd->num_connections; i++) { |
| 656 | ret = sock_xmit(nbd, i, 1, &request, sizeof(request), 0); |
| 657 | if (ret <= 0) |
| 658 | dev_err(disk_to_dev(nbd->disk), |
| 659 | "Send disconnect failed %d\n", ret); |
| 660 | } |
| 661 | } |
| 662 | |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 663 | static int nbd_dev_dbg_init(struct nbd_device *nbd); |
| 664 | static void nbd_dev_dbg_close(struct nbd_device *nbd); |
| 665 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 666 | /* Must be called with config_lock held */ |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 667 | static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 668 | unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | switch (cmd) { |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 671 | case NBD_DISCONNECT: { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 672 | dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n"); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 673 | if (!nbd->socks) |
Paolo Bonzini | 3a2d63f8 | 2013-02-27 17:05:25 -0800 | [diff] [blame] | 674 | return -EINVAL; |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 675 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 676 | mutex_unlock(&nbd->config_lock); |
Paolo Bonzini | 3a2d63f8 | 2013-02-27 17:05:25 -0800 | [diff] [blame] | 677 | fsync_bdev(bdev); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 678 | mutex_lock(&nbd->config_lock); |
Paolo Bonzini | 3a2d63f8 | 2013-02-27 17:05:25 -0800 | [diff] [blame] | 679 | |
| 680 | /* Check again after getting mutex back. */ |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 681 | if (!nbd->socks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | return -EINVAL; |
Paolo Bonzini | 3a2d63f8 | 2013-02-27 17:05:25 -0800 | [diff] [blame] | 683 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 684 | if (!test_and_set_bit(NBD_DISCONNECT_REQUESTED, |
| 685 | &nbd->runtime_flags)) |
| 686 | send_disconnects(nbd); |
Paul Clements | c378f70 | 2013-07-03 15:09:04 -0700 | [diff] [blame] | 687 | return 0; |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 688 | } |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 689 | |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 690 | case NBD_CLEAR_SOCK: |
| 691 | sock_shutdown(nbd); |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 692 | nbd_clear_que(nbd); |
Paolo Bonzini | 3a2d63f8 | 2013-02-27 17:05:25 -0800 | [diff] [blame] | 693 | kill_bdev(bdev); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 694 | nbd_bdev_reset(bdev); |
| 695 | /* |
| 696 | * We want to give the run thread a chance to wait for everybody |
| 697 | * to clean up and then do it's own cleanup. |
| 698 | */ |
| 699 | if (!test_bit(NBD_RUNNING, &nbd->runtime_flags)) { |
| 700 | int i; |
| 701 | |
| 702 | for (i = 0; i < nbd->num_connections; i++) |
| 703 | kfree(nbd->socks[i]); |
| 704 | kfree(nbd->socks); |
| 705 | nbd->socks = NULL; |
| 706 | nbd->num_connections = 0; |
| 707 | } |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 708 | return 0; |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 709 | |
| 710 | case NBD_SET_SOCK: { |
Al Viro | e251157 | 2014-03-05 20:41:36 -0500 | [diff] [blame] | 711 | int err; |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 712 | struct socket *sock = sockfd_lookup(arg, &err); |
| 713 | |
| 714 | if (!sock) |
| 715 | return err; |
| 716 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 717 | err = nbd_add_socket(nbd, sock); |
Markus Pargmann | 23272a67 | 2015-10-29 11:51:16 +0100 | [diff] [blame] | 718 | if (!err && max_part) |
| 719 | bdev->bd_invalidated = 1; |
| 720 | |
| 721 | return err; |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 722 | } |
| 723 | |
Markus Pargmann | 37091fd | 2015-07-27 07:36:49 +0200 | [diff] [blame] | 724 | case NBD_SET_BLKSIZE: { |
Arnd Bergmann | 5e454c6 | 2016-03-05 00:49:31 +0100 | [diff] [blame] | 725 | loff_t bsize = div_s64(nbd->bytesize, arg); |
Markus Pargmann | 37091fd | 2015-07-27 07:36:49 +0200 | [diff] [blame] | 726 | |
| 727 | return nbd_size_set(nbd, bdev, arg, bsize); |
| 728 | } |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | case NBD_SET_SIZE: |
Markus Pargmann | 37091fd | 2015-07-27 07:36:49 +0200 | [diff] [blame] | 731 | return nbd_size_set(nbd, bdev, nbd->blksize, |
| 732 | arg / nbd->blksize); |
| 733 | |
| 734 | case NBD_SET_SIZE_BLOCKS: |
| 735 | return nbd_size_set(nbd, bdev, nbd->blksize, arg); |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 736 | |
Paul Clements | 7fdfd40 | 2007-10-16 23:27:37 -0700 | [diff] [blame] | 737 | case NBD_SET_TIMEOUT: |
Josef Bacik | 0eadf37 | 2016-09-08 12:33:40 -0700 | [diff] [blame] | 738 | nbd->tag_set.timeout = arg * HZ; |
Paul Clements | 7fdfd40 | 2007-10-16 23:27:37 -0700 | [diff] [blame] | 739 | return 0; |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 740 | |
Paul Clements | 2f01250 | 2012-10-04 17:16:15 -0700 | [diff] [blame] | 741 | case NBD_SET_FLAGS: |
| 742 | nbd->flags = arg; |
| 743 | return 0; |
| 744 | |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 745 | case NBD_DO_IT: { |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 746 | struct recv_thread_args *args; |
| 747 | int num_connections = nbd->num_connections; |
| 748 | int error, i; |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 749 | |
Markus Pargmann | 6521d39 | 2015-08-17 08:20:05 +0200 | [diff] [blame] | 750 | if (nbd->task_recv) |
Pavel Machek | c91192d | 2009-01-15 13:51:03 -0800 | [diff] [blame] | 751 | return -EBUSY; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 752 | if (!nbd->socks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | return -EINVAL; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 754 | if (num_connections > 1 && |
| 755 | !(nbd->flags & NBD_FLAG_CAN_MULTI_CONN)) { |
| 756 | dev_err(disk_to_dev(nbd->disk), "server does not support multiple connections per device.\n"); |
| 757 | goto out_err; |
| 758 | } |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 759 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 760 | set_bit(NBD_RUNNING, &nbd->runtime_flags); |
| 761 | blk_mq_update_nr_hw_queues(&nbd->tag_set, nbd->num_connections); |
| 762 | args = kcalloc(num_connections, sizeof(*args), GFP_KERNEL); |
| 763 | if (!args) |
| 764 | goto out_err; |
Vegard Nossum | 9724096 | 2016-05-27 12:59:35 +0200 | [diff] [blame] | 765 | nbd->task_recv = current; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 766 | mutex_unlock(&nbd->config_lock); |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 767 | |
Markus Pargmann | d02cf53 | 2015-10-29 12:06:15 +0100 | [diff] [blame] | 768 | nbd_parse_flags(nbd, bdev); |
Paul Clements | a336d29 | 2012-10-04 17:16:18 -0700 | [diff] [blame] | 769 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 770 | error = device_create_file(disk_to_dev(nbd->disk), &pid_attr); |
| 771 | if (error) { |
| 772 | dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n"); |
| 773 | goto out_recv; |
| 774 | } |
| 775 | |
| 776 | nbd_size_update(nbd, bdev); |
| 777 | |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 778 | nbd_dev_dbg_init(nbd); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 779 | for (i = 0; i < num_connections; i++) { |
| 780 | sk_set_memalloc(nbd->socks[i]->sock->sk); |
| 781 | atomic_inc(&nbd->recv_threads); |
| 782 | INIT_WORK(&args[i].work, recv_work); |
| 783 | args[i].nbd = nbd; |
| 784 | args[i].index = i; |
| 785 | queue_work(system_long_wq, &args[i].work); |
| 786 | } |
| 787 | wait_event_interruptible(nbd->recv_wq, |
| 788 | atomic_read(&nbd->recv_threads) == 0); |
| 789 | for (i = 0; i < num_connections; i++) |
| 790 | flush_work(&args[i].work); |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 791 | nbd_dev_dbg_close(nbd); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 792 | nbd_size_clear(nbd, bdev); |
| 793 | device_remove_file(disk_to_dev(nbd->disk), &pid_attr); |
| 794 | out_recv: |
| 795 | mutex_lock(&nbd->config_lock); |
Vegard Nossum | 9724096 | 2016-05-27 12:59:35 +0200 | [diff] [blame] | 796 | nbd->task_recv = NULL; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 797 | out_err: |
Markus Pargmann | 36e47be | 2015-08-17 08:20:01 +0200 | [diff] [blame] | 798 | sock_shutdown(nbd); |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 799 | nbd_clear_que(nbd); |
Paolo Bonzini | 3a2d63f8 | 2013-02-27 17:05:25 -0800 | [diff] [blame] | 800 | kill_bdev(bdev); |
Markus Pargmann | 0e4f0f6 | 2015-10-29 12:04:51 +0100 | [diff] [blame] | 801 | nbd_bdev_reset(bdev); |
| 802 | |
Josef Bacik | 9b4a6ba | 2016-09-08 12:33:39 -0700 | [diff] [blame] | 803 | /* user requested, ignore socket errors */ |
| 804 | if (test_bit(NBD_DISCONNECT_REQUESTED, &nbd->runtime_flags)) |
Markus Pargmann | 1f7b5cf | 2015-10-29 12:01:34 +0100 | [diff] [blame] | 805 | error = 0; |
Josef Bacik | 9b4a6ba | 2016-09-08 12:33:39 -0700 | [diff] [blame] | 806 | if (test_bit(NBD_TIMEDOUT, &nbd->runtime_flags)) |
Markus Pargmann | 1f7b5cf | 2015-10-29 12:01:34 +0100 | [diff] [blame] | 807 | error = -ETIMEDOUT; |
| 808 | |
Markus Pargmann | 0e4f0f6 | 2015-10-29 12:04:51 +0100 | [diff] [blame] | 809 | nbd_reset(nbd); |
Markus Pargmann | 1939183 | 2015-08-17 08:20:03 +0200 | [diff] [blame] | 810 | return error; |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 811 | } |
| 812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | case NBD_CLEAR_QUE: |
Herbert Xu | 4b2f026 | 2006-01-06 00:09:47 -0800 | [diff] [blame] | 814 | /* |
| 815 | * This is for compatibility only. The queue is always cleared |
| 816 | * by NBD_DO_IT or NBD_CLEAR_SOCK. |
| 817 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | return 0; |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 819 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | case NBD_PRINT_DEBUG: |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 821 | /* |
| 822 | * For compatibility only, we no longer keep a list of |
| 823 | * outstanding requests. |
| 824 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | return 0; |
| 826 | } |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 827 | return -ENOTTY; |
| 828 | } |
| 829 | |
| 830 | static int nbd_ioctl(struct block_device *bdev, fmode_t mode, |
| 831 | unsigned int cmd, unsigned long arg) |
| 832 | { |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 833 | struct nbd_device *nbd = bdev->bd_disk->private_data; |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 834 | int error; |
| 835 | |
| 836 | if (!capable(CAP_SYS_ADMIN)) |
| 837 | return -EPERM; |
| 838 | |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 839 | BUG_ON(nbd->magic != NBD_MAGIC); |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 840 | |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 841 | mutex_lock(&nbd->config_lock); |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 842 | error = __nbd_ioctl(bdev, nbd, cmd, arg); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 843 | mutex_unlock(&nbd->config_lock); |
Pavel Machek | 1a2ad21 | 2009-04-02 16:58:41 -0700 | [diff] [blame] | 844 | |
| 845 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
| 847 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 848 | static const struct block_device_operations nbd_fops = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | { |
| 850 | .owner = THIS_MODULE, |
Arnd Bergmann | 8a6cfeb | 2010-07-08 10:18:46 +0200 | [diff] [blame] | 851 | .ioctl = nbd_ioctl, |
Al Viro | 263a3df | 2016-01-07 10:04:37 -0500 | [diff] [blame] | 852 | .compat_ioctl = nbd_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | }; |
| 854 | |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 855 | #if IS_ENABLED(CONFIG_DEBUG_FS) |
| 856 | |
| 857 | static int nbd_dbg_tasks_show(struct seq_file *s, void *unused) |
| 858 | { |
| 859 | struct nbd_device *nbd = s->private; |
| 860 | |
| 861 | if (nbd->task_recv) |
| 862 | seq_printf(s, "recv: %d\n", task_pid_nr(nbd->task_recv)); |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 863 | |
| 864 | return 0; |
| 865 | } |
| 866 | |
| 867 | static int nbd_dbg_tasks_open(struct inode *inode, struct file *file) |
| 868 | { |
| 869 | return single_open(file, nbd_dbg_tasks_show, inode->i_private); |
| 870 | } |
| 871 | |
| 872 | static const struct file_operations nbd_dbg_tasks_ops = { |
| 873 | .open = nbd_dbg_tasks_open, |
| 874 | .read = seq_read, |
| 875 | .llseek = seq_lseek, |
| 876 | .release = single_release, |
| 877 | }; |
| 878 | |
| 879 | static int nbd_dbg_flags_show(struct seq_file *s, void *unused) |
| 880 | { |
| 881 | struct nbd_device *nbd = s->private; |
| 882 | u32 flags = nbd->flags; |
| 883 | |
| 884 | seq_printf(s, "Hex: 0x%08x\n\n", flags); |
| 885 | |
| 886 | seq_puts(s, "Known flags:\n"); |
| 887 | |
| 888 | if (flags & NBD_FLAG_HAS_FLAGS) |
| 889 | seq_puts(s, "NBD_FLAG_HAS_FLAGS\n"); |
| 890 | if (flags & NBD_FLAG_READ_ONLY) |
| 891 | seq_puts(s, "NBD_FLAG_READ_ONLY\n"); |
| 892 | if (flags & NBD_FLAG_SEND_FLUSH) |
| 893 | seq_puts(s, "NBD_FLAG_SEND_FLUSH\n"); |
| 894 | if (flags & NBD_FLAG_SEND_TRIM) |
| 895 | seq_puts(s, "NBD_FLAG_SEND_TRIM\n"); |
| 896 | |
| 897 | return 0; |
| 898 | } |
| 899 | |
| 900 | static int nbd_dbg_flags_open(struct inode *inode, struct file *file) |
| 901 | { |
| 902 | return single_open(file, nbd_dbg_flags_show, inode->i_private); |
| 903 | } |
| 904 | |
| 905 | static const struct file_operations nbd_dbg_flags_ops = { |
| 906 | .open = nbd_dbg_flags_open, |
| 907 | .read = seq_read, |
| 908 | .llseek = seq_lseek, |
| 909 | .release = single_release, |
| 910 | }; |
| 911 | |
| 912 | static int nbd_dev_dbg_init(struct nbd_device *nbd) |
| 913 | { |
| 914 | struct dentry *dir; |
Markus Pargmann | 27ea43f | 2015-10-24 21:15:34 +0200 | [diff] [blame] | 915 | |
| 916 | if (!nbd_dbg_dir) |
| 917 | return -EIO; |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 918 | |
| 919 | dir = debugfs_create_dir(nbd_name(nbd), nbd_dbg_dir); |
Markus Pargmann | 27ea43f | 2015-10-24 21:15:34 +0200 | [diff] [blame] | 920 | if (!dir) { |
| 921 | dev_err(nbd_to_dev(nbd), "Failed to create debugfs dir for '%s'\n", |
| 922 | nbd_name(nbd)); |
| 923 | return -EIO; |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 924 | } |
| 925 | nbd->dbg_dir = dir; |
| 926 | |
Markus Pargmann | 27ea43f | 2015-10-24 21:15:34 +0200 | [diff] [blame] | 927 | debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_ops); |
| 928 | debugfs_create_u64("size_bytes", 0444, dir, &nbd->bytesize); |
Josef Bacik | 0eadf37 | 2016-09-08 12:33:40 -0700 | [diff] [blame] | 929 | debugfs_create_u32("timeout", 0444, dir, &nbd->tag_set.timeout); |
Markus Pargmann | 27ea43f | 2015-10-24 21:15:34 +0200 | [diff] [blame] | 930 | debugfs_create_u32("blocksize", 0444, dir, &nbd->blksize); |
Josef Bacik | d366a0f | 2016-06-08 10:32:10 -0400 | [diff] [blame] | 931 | debugfs_create_file("flags", 0444, dir, nbd, &nbd_dbg_flags_ops); |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 932 | |
| 933 | return 0; |
| 934 | } |
| 935 | |
| 936 | static void nbd_dev_dbg_close(struct nbd_device *nbd) |
| 937 | { |
| 938 | debugfs_remove_recursive(nbd->dbg_dir); |
| 939 | } |
| 940 | |
| 941 | static int nbd_dbg_init(void) |
| 942 | { |
| 943 | struct dentry *dbg_dir; |
| 944 | |
| 945 | dbg_dir = debugfs_create_dir("nbd", NULL); |
Markus Pargmann | 27ea43f | 2015-10-24 21:15:34 +0200 | [diff] [blame] | 946 | if (!dbg_dir) |
| 947 | return -EIO; |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 948 | |
| 949 | nbd_dbg_dir = dbg_dir; |
| 950 | |
| 951 | return 0; |
| 952 | } |
| 953 | |
| 954 | static void nbd_dbg_close(void) |
| 955 | { |
| 956 | debugfs_remove_recursive(nbd_dbg_dir); |
| 957 | } |
| 958 | |
| 959 | #else /* IS_ENABLED(CONFIG_DEBUG_FS) */ |
| 960 | |
| 961 | static int nbd_dev_dbg_init(struct nbd_device *nbd) |
| 962 | { |
| 963 | return 0; |
| 964 | } |
| 965 | |
| 966 | static void nbd_dev_dbg_close(struct nbd_device *nbd) |
| 967 | { |
| 968 | } |
| 969 | |
| 970 | static int nbd_dbg_init(void) |
| 971 | { |
| 972 | return 0; |
| 973 | } |
| 974 | |
| 975 | static void nbd_dbg_close(void) |
| 976 | { |
| 977 | } |
| 978 | |
| 979 | #endif |
| 980 | |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 981 | static int nbd_init_request(void *data, struct request *rq, |
| 982 | unsigned int hctx_idx, unsigned int request_idx, |
| 983 | unsigned int numa_node) |
| 984 | { |
| 985 | struct nbd_cmd *cmd = blk_mq_rq_to_pdu(rq); |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 986 | cmd->nbd = data; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 987 | return 0; |
| 988 | } |
| 989 | |
| 990 | static struct blk_mq_ops nbd_mq_ops = { |
| 991 | .queue_rq = nbd_queue_rq, |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 992 | .init_request = nbd_init_request, |
Josef Bacik | 0eadf37 | 2016-09-08 12:33:40 -0700 | [diff] [blame] | 993 | .timeout = nbd_xmit_timeout, |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 994 | }; |
| 995 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | /* |
| 997 | * And here should be modules and kernel interface |
| 998 | * (Just smiley confuses emacs :-) |
| 999 | */ |
| 1000 | |
| 1001 | static int __init nbd_init(void) |
| 1002 | { |
| 1003 | int err = -ENOMEM; |
| 1004 | int i; |
Laurent Vivier | d71a6d7 | 2008-04-29 01:02:51 -0700 | [diff] [blame] | 1005 | int part_shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
Adrian Bunk | 5b7b18c | 2006-03-25 03:07:04 -0800 | [diff] [blame] | 1007 | BUILD_BUG_ON(sizeof(struct nbd_request) != 28); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | |
Laurent Vivier | d71a6d7 | 2008-04-29 01:02:51 -0700 | [diff] [blame] | 1009 | if (max_part < 0) { |
WANG Cong | 7742ce4 | 2011-08-19 14:48:28 +0200 | [diff] [blame] | 1010 | printk(KERN_ERR "nbd: max_part must be >= 0\n"); |
Laurent Vivier | d71a6d7 | 2008-04-29 01:02:51 -0700 | [diff] [blame] | 1011 | return -EINVAL; |
| 1012 | } |
| 1013 | |
| 1014 | part_shift = 0; |
Namhyung Kim | 5988ce2 | 2011-05-28 14:44:46 +0200 | [diff] [blame] | 1015 | if (max_part > 0) { |
Laurent Vivier | d71a6d7 | 2008-04-29 01:02:51 -0700 | [diff] [blame] | 1016 | part_shift = fls(max_part); |
| 1017 | |
Namhyung Kim | 5988ce2 | 2011-05-28 14:44:46 +0200 | [diff] [blame] | 1018 | /* |
| 1019 | * Adjust max_part according to part_shift as it is exported |
| 1020 | * to user space so that user can know the max number of |
| 1021 | * partition kernel should be able to manage. |
| 1022 | * |
| 1023 | * Note that -1 is required because partition 0 is reserved |
| 1024 | * for the whole disk. |
| 1025 | */ |
| 1026 | max_part = (1UL << part_shift) - 1; |
| 1027 | } |
| 1028 | |
Namhyung Kim | 3b27108 | 2011-05-28 14:44:46 +0200 | [diff] [blame] | 1029 | if ((1UL << part_shift) > DISK_MAX_PARTS) |
| 1030 | return -EINVAL; |
| 1031 | |
| 1032 | if (nbds_max > 1UL << (MINORBITS - part_shift)) |
| 1033 | return -EINVAL; |
| 1034 | |
Sudip Mukherjee | ff6b809 | 2015-01-27 18:08:22 +0530 | [diff] [blame] | 1035 | nbd_dev = kcalloc(nbds_max, sizeof(*nbd_dev), GFP_KERNEL); |
| 1036 | if (!nbd_dev) |
| 1037 | return -ENOMEM; |
| 1038 | |
Lars Marowsky-Bree | 40be0c2 | 2005-05-01 08:59:07 -0700 | [diff] [blame] | 1039 | for (i = 0; i < nbds_max; i++) { |
Laurent Vivier | d71a6d7 | 2008-04-29 01:02:51 -0700 | [diff] [blame] | 1040 | struct gendisk *disk = alloc_disk(1 << part_shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | if (!disk) |
| 1042 | goto out; |
| 1043 | nbd_dev[i].disk = disk; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 1044 | |
| 1045 | nbd_dev[i].tag_set.ops = &nbd_mq_ops; |
| 1046 | nbd_dev[i].tag_set.nr_hw_queues = 1; |
| 1047 | nbd_dev[i].tag_set.queue_depth = 128; |
| 1048 | nbd_dev[i].tag_set.numa_node = NUMA_NO_NODE; |
| 1049 | nbd_dev[i].tag_set.cmd_size = sizeof(struct nbd_cmd); |
| 1050 | nbd_dev[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE | |
Josef Bacik | 005043a | 2016-09-21 16:55:31 -0400 | [diff] [blame] | 1051 | BLK_MQ_F_SG_MERGE | BLK_MQ_F_BLOCKING; |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 1052 | nbd_dev[i].tag_set.driver_data = &nbd_dev[i]; |
| 1053 | |
| 1054 | err = blk_mq_alloc_tag_set(&nbd_dev[i].tag_set); |
| 1055 | if (err) { |
| 1056 | put_disk(disk); |
| 1057 | goto out; |
| 1058 | } |
| 1059 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | /* |
| 1061 | * The new linux 2.5 block layer implementation requires |
| 1062 | * every gendisk to have its very own request_queue struct. |
| 1063 | * These structs are big so we dynamically allocate them. |
| 1064 | */ |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 1065 | disk->queue = blk_mq_init_queue(&nbd_dev[i].tag_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | if (!disk->queue) { |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 1067 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | put_disk(disk); |
| 1069 | goto out; |
| 1070 | } |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 1071 | |
Jens Axboe | 31dcfab | 2008-10-31 10:06:37 +0100 | [diff] [blame] | 1072 | /* |
| 1073 | * Tell the block layer that we are not a rotational device |
| 1074 | */ |
| 1075 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, disk->queue); |
Mike Snitzer | b277da0 | 2014-10-04 10:55:32 -0600 | [diff] [blame] | 1076 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, disk->queue); |
Paul Clements | a336d29 | 2012-10-04 17:16:18 -0700 | [diff] [blame] | 1077 | disk->queue->limits.discard_granularity = 512; |
Jens Axboe | 2bb4cd5 | 2015-07-14 08:15:12 -0600 | [diff] [blame] | 1078 | blk_queue_max_discard_sectors(disk->queue, UINT_MAX); |
Paul Clements | a336d29 | 2012-10-04 17:16:18 -0700 | [diff] [blame] | 1079 | disk->queue->limits.discard_zeroes_data = 0; |
Michal Belczyk | 078be02 | 2013-04-30 15:28:28 -0700 | [diff] [blame] | 1080 | blk_queue_max_hw_sectors(disk->queue, 65536); |
| 1081 | disk->queue->limits.max_sectors = 256; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | } |
| 1083 | |
| 1084 | if (register_blkdev(NBD_MAJOR, "nbd")) { |
| 1085 | err = -EIO; |
| 1086 | goto out; |
| 1087 | } |
| 1088 | |
| 1089 | printk(KERN_INFO "nbd: registered device at major %d\n", NBD_MAJOR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 1091 | nbd_dbg_init(); |
| 1092 | |
Lars Marowsky-Bree | 40be0c2 | 2005-05-01 08:59:07 -0700 | [diff] [blame] | 1093 | for (i = 0; i < nbds_max; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | struct gendisk *disk = nbd_dev[i].disk; |
Wanlong Gao | f450716 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 1095 | nbd_dev[i].magic = NBD_MAGIC; |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 1096 | mutex_init(&nbd_dev[i].config_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | disk->major = NBD_MAJOR; |
Laurent Vivier | d71a6d7 | 2008-04-29 01:02:51 -0700 | [diff] [blame] | 1098 | disk->first_minor = i << part_shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | disk->fops = &nbd_fops; |
| 1100 | disk->private_data = &nbd_dev[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | sprintf(disk->disk_name, "nbd%d", i); |
Josef Bacik | 9561a7a | 2016-11-22 14:04:40 -0500 | [diff] [blame^] | 1102 | init_waitqueue_head(&nbd_dev[i].recv_wq); |
Markus Pargmann | 0e4f0f6 | 2015-10-29 12:04:51 +0100 | [diff] [blame] | 1103 | nbd_reset(&nbd_dev[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | add_disk(disk); |
| 1105 | } |
| 1106 | |
| 1107 | return 0; |
| 1108 | out: |
| 1109 | while (i--) { |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 1110 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | blk_cleanup_queue(nbd_dev[i].disk->queue); |
| 1112 | put_disk(nbd_dev[i].disk); |
| 1113 | } |
Sven Wegener | f3944d6 | 2008-08-20 14:09:07 -0700 | [diff] [blame] | 1114 | kfree(nbd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | return err; |
| 1116 | } |
| 1117 | |
| 1118 | static void __exit nbd_cleanup(void) |
| 1119 | { |
| 1120 | int i; |
Markus Pargmann | 30d53d9 | 2015-08-17 08:20:06 +0200 | [diff] [blame] | 1121 | |
| 1122 | nbd_dbg_close(); |
| 1123 | |
Lars Marowsky-Bree | 40be0c2 | 2005-05-01 08:59:07 -0700 | [diff] [blame] | 1124 | for (i = 0; i < nbds_max; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | struct gendisk *disk = nbd_dev[i].disk; |
Lars Marowsky-Bree | 40be0c2 | 2005-05-01 08:59:07 -0700 | [diff] [blame] | 1126 | nbd_dev[i].magic = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | if (disk) { |
| 1128 | del_gendisk(disk); |
| 1129 | blk_cleanup_queue(disk->queue); |
Josef Bacik | fd8383f | 2016-09-08 12:33:37 -0700 | [diff] [blame] | 1130 | blk_mq_free_tag_set(&nbd_dev[i].tag_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | put_disk(disk); |
| 1132 | } |
| 1133 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | unregister_blkdev(NBD_MAJOR, "nbd"); |
Sven Wegener | f3944d6 | 2008-08-20 14:09:07 -0700 | [diff] [blame] | 1135 | kfree(nbd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | printk(KERN_INFO "nbd: unregistered device at major %d\n", NBD_MAJOR); |
| 1137 | } |
| 1138 | |
| 1139 | module_init(nbd_init); |
| 1140 | module_exit(nbd_cleanup); |
| 1141 | |
| 1142 | MODULE_DESCRIPTION("Network Block Device"); |
| 1143 | MODULE_LICENSE("GPL"); |
| 1144 | |
Lars Marowsky-Bree | 40be0c2 | 2005-05-01 08:59:07 -0700 | [diff] [blame] | 1145 | module_param(nbds_max, int, 0444); |
Laurent Vivier | d71a6d7 | 2008-04-29 01:02:51 -0700 | [diff] [blame] | 1146 | MODULE_PARM_DESC(nbds_max, "number of network block devices to initialize (default: 16)"); |
| 1147 | module_param(max_part, int, 0444); |
| 1148 | MODULE_PARM_DESC(max_part, "number of partitions per device (default: 0)"); |