Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sunrpc/rpc_pipe.c |
| 3 | * |
| 4 | * Userland/kernel interface for rpcauth_gss. |
| 5 | * Code shamelessly plagiarized from fs/nfsd/nfsctl.c |
Rolf Eike Beer | d51fe1b | 2005-09-02 08:59:25 +0200 | [diff] [blame] | 6 | * and fs/sysfs/inode.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> |
| 9 | * |
| 10 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/module.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/pagemap.h> |
| 15 | #include <linux/mount.h> |
| 16 | #include <linux/namei.h> |
Trond Myklebust | 50e437d | 2007-06-07 22:44:34 -0400 | [diff] [blame] | 17 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
Trond Myklebust | 2446ab6 | 2012-03-01 17:00:56 -0500 | [diff] [blame] | 19 | #include <linux/rcupdate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | #include <asm/ioctls.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/poll.h> |
| 23 | #include <linux/wait.h> |
| 24 | #include <linux/seq_file.h> |
| 25 | |
| 26 | #include <linux/sunrpc/clnt.h> |
| 27 | #include <linux/workqueue.h> |
| 28 | #include <linux/sunrpc/rpc_pipe_fs.h> |
Trond Myklebust | 8854e82 | 2009-08-09 15:14:30 -0400 | [diff] [blame] | 29 | #include <linux/sunrpc/cache.h> |
Stanislav Kinsbursky | 021c68d | 2011-12-26 15:39:04 +0300 | [diff] [blame] | 30 | #include <linux/nsproxy.h> |
Stanislav Kinsbursky | 2d00131 | 2011-12-26 15:39:13 +0300 | [diff] [blame] | 31 | #include <linux/notifier.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Stanislav Kinsbursky | 021c68d | 2011-12-26 15:39:04 +0300 | [diff] [blame] | 33 | #include "netns.h" |
Stanislav Kinsbursky | 2d00131 | 2011-12-26 15:39:13 +0300 | [diff] [blame] | 34 | #include "sunrpc.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Stanislav Kinsbursky | efc46bf | 2011-12-26 15:39:47 +0300 | [diff] [blame] | 36 | #define RPCDBG_FACILITY RPCDBG_DEBUG |
| 37 | |
| 38 | #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | static struct file_system_type rpc_pipe_fs_type; |
| 41 | |
| 42 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 43 | static struct kmem_cache *rpc_inode_cachep __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | #define RPC_UPCALL_TIMEOUT (30*HZ) |
| 46 | |
Stanislav Kinsbursky | 2d00131 | 2011-12-26 15:39:13 +0300 | [diff] [blame] | 47 | static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); |
| 48 | |
| 49 | int rpc_pipefs_notifier_register(struct notifier_block *nb) |
| 50 | { |
| 51 | return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); |
| 52 | } |
| 53 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); |
| 54 | |
| 55 | void rpc_pipefs_notifier_unregister(struct notifier_block *nb) |
| 56 | { |
| 57 | blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); |
| 58 | } |
| 59 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); |
| 60 | |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 61 | static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head, |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 62 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) |
Trond Myklebust | b3eb67a | 2005-11-25 17:10:11 -0500 | [diff] [blame] | 63 | { |
| 64 | struct rpc_pipe_msg *msg; |
Trond Myklebust | b3eb67a | 2005-11-25 17:10:11 -0500 | [diff] [blame] | 65 | |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 66 | if (list_empty(head)) |
| 67 | return; |
| 68 | do { |
Trond Myklebust | b3eb67a | 2005-11-25 17:10:11 -0500 | [diff] [blame] | 69 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
Trond Myklebust | 5a67657 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 70 | list_del_init(&msg->list); |
Trond Myklebust | b3eb67a | 2005-11-25 17:10:11 -0500 | [diff] [blame] | 71 | msg->errno = err; |
| 72 | destroy_msg(msg); |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 73 | } while (!list_empty(head)); |
Jeff Layton | 92123e0 | 2012-06-11 10:03:42 -0400 | [diff] [blame] | 74 | |
| 75 | if (waitq) |
| 76 | wake_up(waitq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | static void |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 80 | rpc_timeout_upcall_queue(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 82 | LIST_HEAD(free_list); |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 83 | struct rpc_pipe *pipe = |
| 84 | container_of(work, struct rpc_pipe, queue_timeout.work); |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 85 | void (*destroy_msg)(struct rpc_pipe_msg *); |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 86 | struct dentry *dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 88 | spin_lock(&pipe->lock); |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 89 | destroy_msg = pipe->ops->destroy_msg; |
| 90 | if (pipe->nreaders == 0) { |
| 91 | list_splice_init(&pipe->pipe, &free_list); |
| 92 | pipe->pipelen = 0; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 93 | } |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 94 | dentry = dget(pipe->dentry); |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 95 | spin_unlock(&pipe->lock); |
Jeff Layton | 92123e0 | 2012-06-11 10:03:42 -0400 | [diff] [blame] | 96 | rpc_purge_list(dentry ? &RPC_I(dentry->d_inode)->waitq : NULL, |
| 97 | &free_list, destroy_msg, -ETIMEDOUT); |
| 98 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
Peng Tao | c122515 | 2011-09-22 21:50:10 -0400 | [diff] [blame] | 101 | ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, |
| 102 | char __user *dst, size_t buflen) |
| 103 | { |
| 104 | char *data = (char *)msg->data + msg->copied; |
| 105 | size_t mlen = min(msg->len - msg->copied, buflen); |
| 106 | unsigned long left; |
| 107 | |
| 108 | left = copy_to_user(dst, data, mlen); |
| 109 | if (left == mlen) { |
| 110 | msg->errno = -EFAULT; |
| 111 | return -EFAULT; |
| 112 | } |
| 113 | |
| 114 | mlen -= left; |
| 115 | msg->copied += mlen; |
| 116 | msg->errno = 0; |
| 117 | return mlen; |
| 118 | } |
| 119 | EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); |
| 120 | |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 121 | /** |
Ben Hutchings | 1a5778a | 2010-02-14 22:35:47 -0800 | [diff] [blame] | 122 | * rpc_queue_upcall - queue an upcall message to userspace |
Randy Dunlap | bda1460 | 2012-05-13 10:35:40 -0700 | [diff] [blame] | 123 | * @pipe: upcall pipe on which to queue given message |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 124 | * @msg: message to queue |
| 125 | * |
| 126 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. |
| 127 | * A userspace process may then later read the upcall by performing a |
| 128 | * read on an open file for this inode. It is up to the caller to |
| 129 | * initialize the fields of @msg (other than @msg->list) appropriately. |
| 130 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | int |
Stanislav Kinsbursky | d706ed1 | 2011-12-26 15:43:49 +0300 | [diff] [blame] | 132 | rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | { |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 134 | int res = -EPIPE; |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 135 | struct dentry *dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 137 | spin_lock(&pipe->lock); |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 138 | if (pipe->nreaders) { |
| 139 | list_add_tail(&msg->list, &pipe->pipe); |
| 140 | pipe->pipelen += msg->len; |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 141 | res = 0; |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 142 | } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
| 143 | if (list_empty(&pipe->pipe)) |
Trond Myklebust | 24c5d9d | 2006-03-20 13:44:08 -0500 | [diff] [blame] | 144 | queue_delayed_work(rpciod_workqueue, |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 145 | &pipe->queue_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | RPC_UPCALL_TIMEOUT); |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 147 | list_add_tail(&msg->list, &pipe->pipe); |
| 148 | pipe->pipelen += msg->len; |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 149 | res = 0; |
| 150 | } |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 151 | dentry = dget(pipe->dentry); |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 152 | spin_unlock(&pipe->lock); |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 153 | if (dentry) { |
| 154 | wake_up(&RPC_I(dentry->d_inode)->waitq); |
| 155 | dput(dentry); |
| 156 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | return res; |
| 158 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 159 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 161 | static inline void |
| 162 | rpc_inode_setowner(struct inode *inode, void *private) |
| 163 | { |
| 164 | RPC_I(inode)->private = private; |
| 165 | } |
| 166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | static void |
| 168 | rpc_close_pipes(struct inode *inode) |
| 169 | { |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 170 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
\"J. Bruce Fields\ | e712804 | 2008-12-23 16:09:47 -0500 | [diff] [blame] | 171 | int need_release; |
Stanislav Kinsbursky | ad6b134 | 2012-01-10 16:12:38 +0400 | [diff] [blame] | 172 | LIST_HEAD(free_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 174 | mutex_lock(&inode->i_mutex); |
Stanislav Kinsbursky | ad6b134 | 2012-01-10 16:12:38 +0400 | [diff] [blame] | 175 | spin_lock(&pipe->lock); |
| 176 | need_release = pipe->nreaders != 0 || pipe->nwriters != 0; |
| 177 | pipe->nreaders = 0; |
| 178 | list_splice_init(&pipe->in_upcall, &free_list); |
| 179 | list_splice_init(&pipe->pipe, &free_list); |
| 180 | pipe->pipelen = 0; |
| 181 | pipe->dentry = NULL; |
| 182 | spin_unlock(&pipe->lock); |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 183 | rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE); |
Stanislav Kinsbursky | ad6b134 | 2012-01-10 16:12:38 +0400 | [diff] [blame] | 184 | pipe->nwriters = 0; |
| 185 | if (need_release && pipe->ops->release_pipe) |
| 186 | pipe->ops->release_pipe(inode); |
| 187 | cancel_delayed_work_sync(&pipe->queue_timeout); |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 188 | rpc_inode_setowner(inode, NULL); |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 189 | RPC_I(inode)->pipe = NULL; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 190 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | static struct inode * |
| 194 | rpc_alloc_inode(struct super_block *sb) |
| 195 | { |
| 196 | struct rpc_inode *rpci; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 197 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | if (!rpci) |
| 199 | return NULL; |
| 200 | return &rpci->vfs_inode; |
| 201 | } |
| 202 | |
| 203 | static void |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 204 | rpc_i_callback(struct rcu_head *head) |
| 205 | { |
| 206 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 207 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
| 208 | } |
| 209 | |
| 210 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | rpc_destroy_inode(struct inode *inode) |
| 212 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 213 | call_rcu(&inode->i_rcu, rpc_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | static int |
| 217 | rpc_pipe_open(struct inode *inode, struct file *filp) |
| 218 | { |
Trond Myklebust | abfdbd5 | 2013-05-15 11:28:54 -0700 | [diff] [blame] | 219 | struct net *net = inode->i_sb->s_fs_info; |
| 220 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 221 | struct rpc_pipe *pipe; |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 222 | int first_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | int res = -ENXIO; |
| 224 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 225 | mutex_lock(&inode->i_mutex); |
Trond Myklebust | abfdbd5 | 2013-05-15 11:28:54 -0700 | [diff] [blame] | 226 | sn->gssd_running = 1; |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 227 | pipe = RPC_I(inode)->pipe; |
| 228 | if (pipe == NULL) |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 229 | goto out; |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 230 | first_open = pipe->nreaders == 0 && pipe->nwriters == 0; |
| 231 | if (first_open && pipe->ops->open_pipe) { |
| 232 | res = pipe->ops->open_pipe(inode); |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 233 | if (res) |
| 234 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 236 | if (filp->f_mode & FMODE_READ) |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 237 | pipe->nreaders++; |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 238 | if (filp->f_mode & FMODE_WRITE) |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 239 | pipe->nwriters++; |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 240 | res = 0; |
| 241 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 242 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | return res; |
| 244 | } |
| 245 | |
| 246 | static int |
| 247 | rpc_pipe_release(struct inode *inode, struct file *filp) |
| 248 | { |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 249 | struct rpc_pipe *pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | struct rpc_pipe_msg *msg; |
\"J. Bruce Fields\ | e712804 | 2008-12-23 16:09:47 -0500 | [diff] [blame] | 251 | int last_close; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 253 | mutex_lock(&inode->i_mutex); |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 254 | pipe = RPC_I(inode)->pipe; |
| 255 | if (pipe == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | goto out; |
Joe Perches | 655b5bb | 2010-09-04 18:52:53 -0700 | [diff] [blame] | 257 | msg = filp->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | if (msg != NULL) { |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 259 | spin_lock(&pipe->lock); |
Trond Myklebust | 48e4918 | 2005-12-19 17:11:22 -0500 | [diff] [blame] | 260 | msg->errno = -EAGAIN; |
Trond Myklebust | 5a67657 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 261 | list_del_init(&msg->list); |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 262 | spin_unlock(&pipe->lock); |
| 263 | pipe->ops->destroy_msg(msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } |
| 265 | if (filp->f_mode & FMODE_WRITE) |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 266 | pipe->nwriters --; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 267 | if (filp->f_mode & FMODE_READ) { |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 268 | pipe->nreaders --; |
| 269 | if (pipe->nreaders == 0) { |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 270 | LIST_HEAD(free_list); |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 271 | spin_lock(&pipe->lock); |
| 272 | list_splice_init(&pipe->pipe, &free_list); |
| 273 | pipe->pipelen = 0; |
| 274 | spin_unlock(&pipe->lock); |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 275 | rpc_purge_list(&RPC_I(inode)->waitq, &free_list, |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 276 | pipe->ops->destroy_msg, -EAGAIN); |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 277 | } |
| 278 | } |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 279 | last_close = pipe->nwriters == 0 && pipe->nreaders == 0; |
| 280 | if (last_close && pipe->ops->release_pipe) |
| 281 | pipe->ops->release_pipe(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 283 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static ssize_t |
| 288 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) |
| 289 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 290 | struct inode *inode = file_inode(filp); |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 291 | struct rpc_pipe *pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | struct rpc_pipe_msg *msg; |
| 293 | int res = 0; |
| 294 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 295 | mutex_lock(&inode->i_mutex); |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 296 | pipe = RPC_I(inode)->pipe; |
| 297 | if (pipe == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | res = -EPIPE; |
| 299 | goto out_unlock; |
| 300 | } |
| 301 | msg = filp->private_data; |
| 302 | if (msg == NULL) { |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 303 | spin_lock(&pipe->lock); |
| 304 | if (!list_empty(&pipe->pipe)) { |
| 305 | msg = list_entry(pipe->pipe.next, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | struct rpc_pipe_msg, |
| 307 | list); |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 308 | list_move(&msg->list, &pipe->in_upcall); |
| 309 | pipe->pipelen -= msg->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | filp->private_data = msg; |
| 311 | msg->copied = 0; |
| 312 | } |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 313 | spin_unlock(&pipe->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | if (msg == NULL) |
| 315 | goto out_unlock; |
| 316 | } |
| 317 | /* NOTE: it is up to the callback to update msg->copied */ |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 318 | res = pipe->ops->upcall(filp, msg, buf, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | if (res < 0 || msg->len == msg->copied) { |
| 320 | filp->private_data = NULL; |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 321 | spin_lock(&pipe->lock); |
Trond Myklebust | 5a67657 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 322 | list_del_init(&msg->list); |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 323 | spin_unlock(&pipe->lock); |
| 324 | pipe->ops->destroy_msg(msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
| 326 | out_unlock: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 327 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | return res; |
| 329 | } |
| 330 | |
| 331 | static ssize_t |
| 332 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) |
| 333 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 334 | struct inode *inode = file_inode(filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | int res; |
| 336 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 337 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | res = -EPIPE; |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 339 | if (RPC_I(inode)->pipe != NULL) |
| 340 | res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 341 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | return res; |
| 343 | } |
| 344 | |
| 345 | static unsigned int |
| 346 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) |
| 347 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 348 | struct inode *inode = file_inode(filp); |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 349 | struct rpc_inode *rpci = RPC_I(inode); |
| 350 | unsigned int mask = POLLOUT | POLLWRNORM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | poll_wait(filp, &rpci->waitq, wait); |
| 353 | |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 354 | mutex_lock(&inode->i_mutex); |
| 355 | if (rpci->pipe == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | mask |= POLLERR | POLLHUP; |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 357 | else if (filp->private_data || !list_empty(&rpci->pipe->pipe)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | mask |= POLLIN | POLLRDNORM; |
Stanislav Kinsbursky | 591ad7f | 2012-02-27 22:05:54 +0400 | [diff] [blame] | 359 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | return mask; |
| 361 | } |
| 362 | |
Arnd Bergmann | a6f8dbc | 2010-10-04 21:18:23 +0200 | [diff] [blame] | 363 | static long |
| 364 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 366 | struct inode *inode = file_inode(filp); |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 367 | struct rpc_pipe *pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | int len; |
| 369 | |
| 370 | switch (cmd) { |
| 371 | case FIONREAD: |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 372 | mutex_lock(&inode->i_mutex); |
| 373 | pipe = RPC_I(inode)->pipe; |
| 374 | if (pipe == NULL) { |
| 375 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | return -EPIPE; |
Arnd Bergmann | a6f8dbc | 2010-10-04 21:18:23 +0200 | [diff] [blame] | 377 | } |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 378 | spin_lock(&pipe->lock); |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 379 | len = pipe->pipelen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | if (filp->private_data) { |
| 381 | struct rpc_pipe_msg *msg; |
Joe Perches | 655b5bb | 2010-09-04 18:52:53 -0700 | [diff] [blame] | 382 | msg = filp->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | len += msg->len - msg->copied; |
| 384 | } |
Stanislav Kinsbursky | d0fe13b | 2011-12-26 15:43:41 +0300 | [diff] [blame] | 385 | spin_unlock(&pipe->lock); |
Stanislav Kinsbursky | 2c9030e | 2012-02-27 22:05:45 +0400 | [diff] [blame] | 386 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | return put_user(len, (int __user *)arg); |
| 388 | default: |
| 389 | return -EINVAL; |
| 390 | } |
| 391 | } |
| 392 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 393 | static const struct file_operations rpc_pipe_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | .owner = THIS_MODULE, |
| 395 | .llseek = no_llseek, |
| 396 | .read = rpc_pipe_read, |
| 397 | .write = rpc_pipe_write, |
| 398 | .poll = rpc_pipe_poll, |
Frederic Weisbecker | 674b604 | 2010-05-19 15:08:17 +0200 | [diff] [blame] | 399 | .unlocked_ioctl = rpc_pipe_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | .open = rpc_pipe_open, |
| 401 | .release = rpc_pipe_release, |
| 402 | }; |
| 403 | |
| 404 | static int |
| 405 | rpc_show_info(struct seq_file *m, void *v) |
| 406 | { |
| 407 | struct rpc_clnt *clnt = m->private; |
| 408 | |
Trond Myklebust | 2446ab6 | 2012-03-01 17:00:56 -0500 | [diff] [blame] | 409 | rcu_read_lock(); |
Trond Myklebust | 4e0038b | 2012-03-01 17:01:05 -0500 | [diff] [blame] | 410 | seq_printf(m, "RPC server: %s\n", |
| 411 | rcu_dereference(clnt->cl_xprt)->servername); |
Trond Myklebust | 55909f2 | 2013-08-23 11:48:15 -0400 | [diff] [blame] | 412 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | clnt->cl_prog, clnt->cl_vers); |
Chuck Lever | e7f7865 | 2006-08-22 20:06:19 -0400 | [diff] [blame] | 414 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
| 415 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); |
J. Bruce Fields | bf19aac | 2007-09-26 14:38:09 -0400 | [diff] [blame] | 416 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
Trond Myklebust | 2446ab6 | 2012-03-01 17:00:56 -0500 | [diff] [blame] | 417 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | static int |
| 422 | rpc_info_open(struct inode *inode, struct file *file) |
| 423 | { |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 424 | struct rpc_clnt *clnt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | int ret = single_open(file, rpc_show_info, NULL); |
| 426 | |
| 427 | if (!ret) { |
| 428 | struct seq_file *m = file->private_data; |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 429 | |
| 430 | spin_lock(&file->f_path.dentry->d_lock); |
| 431 | if (!d_unhashed(file->f_path.dentry)) |
| 432 | clnt = RPC_I(inode)->private; |
| 433 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { |
| 434 | spin_unlock(&file->f_path.dentry->d_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | m->private = clnt; |
| 436 | } else { |
Trond Myklebust | 006abe8 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 437 | spin_unlock(&file->f_path.dentry->d_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | single_release(inode, file); |
| 439 | ret = -EINVAL; |
| 440 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
| 442 | return ret; |
| 443 | } |
| 444 | |
| 445 | static int |
| 446 | rpc_info_release(struct inode *inode, struct file *file) |
| 447 | { |
| 448 | struct seq_file *m = file->private_data; |
| 449 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; |
| 450 | |
| 451 | if (clnt) |
| 452 | rpc_release_client(clnt); |
| 453 | return single_release(inode, file); |
| 454 | } |
| 455 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 456 | static const struct file_operations rpc_info_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | .owner = THIS_MODULE, |
| 458 | .open = rpc_info_open, |
| 459 | .read = seq_read, |
| 460 | .llseek = seq_lseek, |
| 461 | .release = rpc_info_release, |
| 462 | }; |
| 463 | |
| 464 | |
| 465 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | * Description of fs contents. |
| 467 | */ |
| 468 | struct rpc_filelist { |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 469 | const char *name; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 470 | const struct file_operations *i_fop; |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 471 | umode_t mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | }; |
| 473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | static struct inode * |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 475 | rpc_get_inode(struct super_block *sb, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | { |
| 477 | struct inode *inode = new_inode(sb); |
| 478 | if (!inode) |
| 479 | return NULL; |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 480 | inode->i_ino = get_next_ino(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | inode->i_mode = mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
Joe Perches | 89f0e4f | 2011-07-01 09:43:12 +0000 | [diff] [blame] | 483 | switch (mode & S_IFMT) { |
| 484 | case S_IFDIR: |
| 485 | inode->i_fop = &simple_dir_operations; |
Jeff Layton | 275448e | 2013-07-16 09:16:45 -0400 | [diff] [blame] | 486 | inode->i_op = &simple_dir_inode_operations; |
Joe Perches | 89f0e4f | 2011-07-01 09:43:12 +0000 | [diff] [blame] | 487 | inc_nlink(inode); |
| 488 | default: |
| 489 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | } |
| 491 | return inode; |
| 492 | } |
| 493 | |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 494 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
| 495 | umode_t mode, |
| 496 | const struct file_operations *i_fop, |
| 497 | void *private) |
| 498 | { |
| 499 | struct inode *inode; |
| 500 | |
Trond Myklebust | beb0f0a | 2010-12-20 21:19:26 +0000 | [diff] [blame] | 501 | d_drop(dentry); |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 502 | inode = rpc_get_inode(dir->i_sb, mode); |
| 503 | if (!inode) |
| 504 | goto out_err; |
| 505 | inode->i_ino = iunique(dir->i_sb, 100); |
| 506 | if (i_fop) |
| 507 | inode->i_fop = i_fop; |
| 508 | if (private) |
| 509 | rpc_inode_setowner(inode, private); |
| 510 | d_add(dentry, inode); |
| 511 | return 0; |
| 512 | out_err: |
Al Viro | 1e903ed | 2013-09-16 10:57:41 -0400 | [diff] [blame] | 513 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n", |
| 514 | __FILE__, __func__, dentry); |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 515 | dput(dentry); |
| 516 | return -ENOMEM; |
| 517 | } |
| 518 | |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 519 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
| 520 | umode_t mode, |
| 521 | const struct file_operations *i_fop, |
| 522 | void *private) |
| 523 | { |
| 524 | int err; |
| 525 | |
| 526 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); |
| 527 | if (err) |
| 528 | return err; |
| 529 | fsnotify_create(dir, dentry); |
| 530 | return 0; |
| 531 | } |
| 532 | |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 533 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
| 534 | umode_t mode, |
| 535 | const struct file_operations *i_fop, |
| 536 | void *private) |
| 537 | { |
| 538 | int err; |
| 539 | |
| 540 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); |
| 541 | if (err) |
| 542 | return err; |
| 543 | inc_nlink(dir); |
| 544 | fsnotify_mkdir(dir, dentry); |
| 545 | return 0; |
| 546 | } |
| 547 | |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 548 | static void |
| 549 | init_pipe(struct rpc_pipe *pipe) |
| 550 | { |
| 551 | pipe->nreaders = 0; |
| 552 | pipe->nwriters = 0; |
| 553 | INIT_LIST_HEAD(&pipe->in_upcall); |
| 554 | INIT_LIST_HEAD(&pipe->in_downcall); |
| 555 | INIT_LIST_HEAD(&pipe->pipe); |
| 556 | pipe->pipelen = 0; |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 557 | INIT_DELAYED_WORK(&pipe->queue_timeout, |
| 558 | rpc_timeout_upcall_queue); |
| 559 | pipe->ops = NULL; |
| 560 | spin_lock_init(&pipe->lock); |
Stanislav Kinsbursky | c239d83 | 2011-12-26 15:44:06 +0300 | [diff] [blame] | 561 | pipe->dentry = NULL; |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 562 | } |
| 563 | |
Stanislav Kinsbursky | c239d83 | 2011-12-26 15:44:06 +0300 | [diff] [blame] | 564 | void rpc_destroy_pipe_data(struct rpc_pipe *pipe) |
| 565 | { |
| 566 | kfree(pipe); |
| 567 | } |
| 568 | EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); |
| 569 | |
| 570 | struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 571 | { |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 572 | struct rpc_pipe *pipe; |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 573 | |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 574 | pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); |
| 575 | if (!pipe) |
Stanislav Kinsbursky | c239d83 | 2011-12-26 15:44:06 +0300 | [diff] [blame] | 576 | return ERR_PTR(-ENOMEM); |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 577 | init_pipe(pipe); |
Stanislav Kinsbursky | c239d83 | 2011-12-26 15:44:06 +0300 | [diff] [blame] | 578 | pipe->ops = ops; |
| 579 | pipe->flags = flags; |
| 580 | return pipe; |
| 581 | } |
| 582 | EXPORT_SYMBOL_GPL(rpc_mkpipe_data); |
| 583 | |
| 584 | static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, |
| 585 | umode_t mode, |
| 586 | const struct file_operations *i_fop, |
| 587 | void *private, |
| 588 | struct rpc_pipe *pipe) |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 589 | { |
| 590 | struct rpc_inode *rpci; |
| 591 | int err; |
| 592 | |
| 593 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); |
| 594 | if (err) |
| 595 | return err; |
| 596 | rpci = RPC_I(dentry->d_inode); |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 597 | rpci->private = private; |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 598 | rpci->pipe = pipe; |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 599 | fsnotify_create(dir, dentry); |
| 600 | return 0; |
| 601 | } |
| 602 | |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 603 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
| 604 | { |
| 605 | int ret; |
| 606 | |
| 607 | dget(dentry); |
| 608 | ret = simple_rmdir(dir, dentry); |
| 609 | d_delete(dentry); |
| 610 | dput(dentry); |
| 611 | return ret; |
| 612 | } |
| 613 | |
Stanislav Kinsbursky | eee1732 | 2012-01-10 16:13:19 +0400 | [diff] [blame] | 614 | int rpc_rmdir(struct dentry *dentry) |
| 615 | { |
| 616 | struct dentry *parent; |
| 617 | struct inode *dir; |
| 618 | int error; |
| 619 | |
| 620 | parent = dget_parent(dentry); |
| 621 | dir = parent->d_inode; |
| 622 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| 623 | error = __rpc_rmdir(dir, dentry); |
| 624 | mutex_unlock(&dir->i_mutex); |
| 625 | dput(parent); |
| 626 | return error; |
| 627 | } |
| 628 | EXPORT_SYMBOL_GPL(rpc_rmdir); |
| 629 | |
Trond Myklebust | 810d90b | 2009-08-09 15:14:18 -0400 | [diff] [blame] | 630 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
| 631 | { |
| 632 | int ret; |
| 633 | |
| 634 | dget(dentry); |
| 635 | ret = simple_unlink(dir, dentry); |
| 636 | d_delete(dentry); |
| 637 | dput(dentry); |
| 638 | return ret; |
| 639 | } |
| 640 | |
| 641 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) |
| 642 | { |
| 643 | struct inode *inode = dentry->d_inode; |
Trond Myklebust | 810d90b | 2009-08-09 15:14:18 -0400 | [diff] [blame] | 644 | |
Trond Myklebust | 810d90b | 2009-08-09 15:14:18 -0400 | [diff] [blame] | 645 | rpc_close_pipes(inode); |
| 646 | return __rpc_unlink(dir, dentry); |
| 647 | } |
| 648 | |
Trond Myklebust | cfeaa4a | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 649 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
Al Viro | d3db90b | 2013-07-14 17:09:57 +0400 | [diff] [blame] | 650 | const char *name) |
Trond Myklebust | cfeaa4a | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 651 | { |
Al Viro | d3db90b | 2013-07-14 17:09:57 +0400 | [diff] [blame] | 652 | struct qstr q = QSTR_INIT(name, strlen(name)); |
| 653 | struct dentry *dentry = d_hash_and_lookup(parent, &q); |
Stanislav Kinsbursky | 5bff038 | 2011-11-08 15:09:19 +0300 | [diff] [blame] | 654 | if (!dentry) { |
Al Viro | d3db90b | 2013-07-14 17:09:57 +0400 | [diff] [blame] | 655 | dentry = d_alloc(parent, &q); |
Stanislav Kinsbursky | 5bff038 | 2011-11-08 15:09:19 +0300 | [diff] [blame] | 656 | if (!dentry) |
| 657 | return ERR_PTR(-ENOMEM); |
| 658 | } |
Jeff Layton | 76fa666 | 2013-07-02 13:00:52 -0400 | [diff] [blame] | 659 | if (dentry->d_inode == NULL) |
Dan Carpenter | f1f0abe | 2010-03-21 12:10:34 -0400 | [diff] [blame] | 660 | return dentry; |
Trond Myklebust | cfeaa4a | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 661 | dput(dentry); |
| 662 | return ERR_PTR(-EEXIST); |
| 663 | } |
| 664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | /* |
| 666 | * FIXME: This probably has races. |
| 667 | */ |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 668 | static void __rpc_depopulate(struct dentry *parent, |
| 669 | const struct rpc_filelist *files, |
| 670 | int start, int eof) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | { |
| 672 | struct inode *dir = parent->d_inode; |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 673 | struct dentry *dentry; |
| 674 | struct qstr name; |
| 675 | int i; |
| 676 | |
| 677 | for (i = start; i < eof; i++) { |
| 678 | name.name = files[i].name; |
| 679 | name.len = strlen(files[i].name); |
Al Viro | d3db90b | 2013-07-14 17:09:57 +0400 | [diff] [blame] | 680 | dentry = d_hash_and_lookup(parent, &name); |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 681 | |
| 682 | if (dentry == NULL) |
| 683 | continue; |
| 684 | if (dentry->d_inode == NULL) |
| 685 | goto next; |
| 686 | switch (dentry->d_inode->i_mode & S_IFMT) { |
| 687 | default: |
| 688 | BUG(); |
| 689 | case S_IFREG: |
| 690 | __rpc_unlink(dir, dentry); |
| 691 | break; |
| 692 | case S_IFDIR: |
| 693 | __rpc_rmdir(dir, dentry); |
| 694 | } |
| 695 | next: |
| 696 | dput(dentry); |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | static void rpc_depopulate(struct dentry *parent, |
| 701 | const struct rpc_filelist *files, |
| 702 | int start, int eof) |
| 703 | { |
| 704 | struct inode *dir = parent->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 706 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 707 | __rpc_depopulate(parent, files, start, eof); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 708 | mutex_unlock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
| 710 | |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 711 | static int rpc_populate(struct dentry *parent, |
| 712 | const struct rpc_filelist *files, |
| 713 | int start, int eof, |
| 714 | void *private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | { |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 716 | struct inode *dir = parent->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | struct dentry *dentry; |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 718 | int i, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 720 | mutex_lock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | for (i = start; i < eof; i++) { |
Al Viro | d3db90b | 2013-07-14 17:09:57 +0400 | [diff] [blame] | 722 | dentry = __rpc_lookup_create_exclusive(parent, files[i].name); |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 723 | err = PTR_ERR(dentry); |
| 724 | if (IS_ERR(dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | goto out_bad; |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 726 | switch (files[i].mode & S_IFMT) { |
| 727 | default: |
| 728 | BUG(); |
| 729 | case S_IFREG: |
| 730 | err = __rpc_create(dir, dentry, |
| 731 | files[i].mode, |
| 732 | files[i].i_fop, |
| 733 | private); |
| 734 | break; |
| 735 | case S_IFDIR: |
| 736 | err = __rpc_mkdir(dir, dentry, |
| 737 | files[i].mode, |
| 738 | NULL, |
| 739 | private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | } |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 741 | if (err != 0) |
| 742 | goto out_bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 744 | mutex_unlock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | return 0; |
| 746 | out_bad: |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 747 | __rpc_depopulate(parent, files, start, eof); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 748 | mutex_unlock(&dir->i_mutex); |
Al Viro | 1e903ed | 2013-09-16 10:57:41 -0400 | [diff] [blame] | 749 | printk(KERN_WARNING "%s: %s failed to populate directory %pd\n", |
| 750 | __FILE__, __func__, parent); |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 751 | return err; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 752 | } |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 753 | |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 754 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
Al Viro | a95e691 | 2013-07-14 16:43:54 +0400 | [diff] [blame] | 755 | const char *name, umode_t mode, void *private, |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 756 | int (*populate)(struct dentry *, void *), void *args_populate) |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 757 | { |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 758 | struct dentry *dentry; |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 759 | struct inode *dir = parent->d_inode; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 760 | int error; |
| 761 | |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 762 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| 763 | dentry = __rpc_lookup_create_exclusive(parent, name); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 764 | if (IS_ERR(dentry)) |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 765 | goto out; |
| 766 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 767 | if (error != 0) |
| 768 | goto out_err; |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 769 | if (populate != NULL) { |
| 770 | error = populate(dentry, args_populate); |
| 771 | if (error) |
| 772 | goto err_rmdir; |
| 773 | } |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 774 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 775 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | 5c3e985 | 2006-07-29 17:37:40 -0400 | [diff] [blame] | 776 | return dentry; |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 777 | err_rmdir: |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 778 | __rpc_rmdir(dir, dentry); |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 779 | out_err: |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 780 | dentry = ERR_PTR(error); |
| 781 | goto out; |
| 782 | } |
| 783 | |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 784 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
| 785 | void (*depopulate)(struct dentry *)) |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 786 | { |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 787 | struct dentry *parent; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 788 | struct inode *dir; |
| 789 | int error; |
| 790 | |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 791 | parent = dget_parent(dentry); |
| 792 | dir = parent->d_inode; |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 793 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 794 | if (depopulate != NULL) |
| 795 | depopulate(dentry); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 796 | error = __rpc_rmdir(dir, dentry); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 797 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 798 | dput(parent); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 799 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | } |
| 801 | |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 802 | /** |
| 803 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication |
| 804 | * @parent: dentry of directory to create new "pipe" in |
| 805 | * @name: name of pipe |
| 806 | * @private: private data to associate with the pipe, for the caller's use |
Randy Dunlap | bda1460 | 2012-05-13 10:35:40 -0700 | [diff] [blame] | 807 | * @pipe: &rpc_pipe containing input parameters |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 808 | * |
| 809 | * Data is made available for userspace to read by calls to |
| 810 | * rpc_queue_upcall(). The actual reads will result in calls to |
| 811 | * @ops->upcall, which will be called with the file pointer, |
| 812 | * message, and userspace buffer to copy to. |
| 813 | * |
| 814 | * Writes can come at any time, and do not necessarily have to be |
| 815 | * responses to upcalls. They will result in calls to @msg->downcall. |
| 816 | * |
| 817 | * The @private argument passed here will be available to all these methods |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 818 | * from the file pointer, via RPC_I(file_inode(file))->private. |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 819 | */ |
Stanislav Kinsbursky | c239d83 | 2011-12-26 15:44:06 +0300 | [diff] [blame] | 820 | struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, |
| 821 | void *private, struct rpc_pipe *pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | struct dentry *dentry; |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 824 | struct inode *dir = parent->d_inode; |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 825 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 826 | int err; |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 827 | |
Stanislav Kinsbursky | c239d83 | 2011-12-26 15:44:06 +0300 | [diff] [blame] | 828 | if (pipe->ops->upcall == NULL) |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 829 | umode &= ~S_IRUGO; |
Stanislav Kinsbursky | c239d83 | 2011-12-26 15:44:06 +0300 | [diff] [blame] | 830 | if (pipe->ops->downcall == NULL) |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 831 | umode &= ~S_IWUGO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
Trond Myklebust | cfeaa4a | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 833 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
Al Viro | d3db90b | 2013-07-14 17:09:57 +0400 | [diff] [blame] | 834 | dentry = __rpc_lookup_create_exclusive(parent, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | if (IS_ERR(dentry)) |
Trond Myklebust | cfeaa4a | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 836 | goto out; |
Stanislav Kinsbursky | c239d83 | 2011-12-26 15:44:06 +0300 | [diff] [blame] | 837 | err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, |
| 838 | private, pipe); |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 839 | if (err) |
| 840 | goto out_err; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 841 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 842 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | 5c3e985 | 2006-07-29 17:37:40 -0400 | [diff] [blame] | 843 | return dentry; |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 844 | out_err: |
| 845 | dentry = ERR_PTR(err); |
Al Viro | 1e903ed | 2013-09-16 10:57:41 -0400 | [diff] [blame] | 846 | printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n", |
| 847 | __FILE__, __func__, parent, name, |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 848 | err); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 849 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | } |
Stanislav Kinsbursky | c239d83 | 2011-12-26 15:44:06 +0300 | [diff] [blame] | 851 | EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 853 | /** |
| 854 | * rpc_unlink - remove a pipe |
| 855 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe |
| 856 | * |
| 857 | * After this call, lookups will no longer find the pipe, and any |
| 858 | * attempts to read or write using preexisting opens of the pipe will |
| 859 | * return -EPIPE. |
| 860 | */ |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 861 | int |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 862 | rpc_unlink(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | { |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 864 | struct dentry *parent; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 865 | struct inode *dir; |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 866 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 868 | parent = dget_parent(dentry); |
| 869 | dir = parent->d_inode; |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 870 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
Trond Myklebust | 810d90b | 2009-08-09 15:14:18 -0400 | [diff] [blame] | 871 | error = __rpc_rmpipe(dir, dentry); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 872 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 873 | dput(parent); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 874 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 876 | EXPORT_SYMBOL_GPL(rpc_unlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
Trond Myklebust | 6739ffb | 2013-08-26 15:38:11 -0400 | [diff] [blame] | 878 | /** |
| 879 | * rpc_init_pipe_dir_head - initialise a struct rpc_pipe_dir_head |
| 880 | * @pdh: pointer to struct rpc_pipe_dir_head |
| 881 | */ |
| 882 | void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh) |
| 883 | { |
| 884 | INIT_LIST_HEAD(&pdh->pdh_entries); |
| 885 | pdh->pdh_dentry = NULL; |
| 886 | } |
| 887 | EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head); |
| 888 | |
| 889 | /** |
| 890 | * rpc_init_pipe_dir_object - initialise a struct rpc_pipe_dir_object |
| 891 | * @pdo: pointer to struct rpc_pipe_dir_object |
| 892 | * @pdo_ops: pointer to const struct rpc_pipe_dir_object_ops |
| 893 | * @pdo_data: pointer to caller-defined data |
| 894 | */ |
| 895 | void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo, |
| 896 | const struct rpc_pipe_dir_object_ops *pdo_ops, |
| 897 | void *pdo_data) |
| 898 | { |
| 899 | INIT_LIST_HEAD(&pdo->pdo_head); |
| 900 | pdo->pdo_ops = pdo_ops; |
| 901 | pdo->pdo_data = pdo_data; |
| 902 | } |
| 903 | EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object); |
| 904 | |
| 905 | static int |
| 906 | rpc_add_pipe_dir_object_locked(struct net *net, |
| 907 | struct rpc_pipe_dir_head *pdh, |
| 908 | struct rpc_pipe_dir_object *pdo) |
| 909 | { |
| 910 | int ret = 0; |
| 911 | |
| 912 | if (pdh->pdh_dentry) |
| 913 | ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo); |
| 914 | if (ret == 0) |
| 915 | list_add_tail(&pdo->pdo_head, &pdh->pdh_entries); |
| 916 | return ret; |
| 917 | } |
| 918 | |
| 919 | static void |
| 920 | rpc_remove_pipe_dir_object_locked(struct net *net, |
| 921 | struct rpc_pipe_dir_head *pdh, |
| 922 | struct rpc_pipe_dir_object *pdo) |
| 923 | { |
| 924 | if (pdh->pdh_dentry) |
| 925 | pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo); |
| 926 | list_del_init(&pdo->pdo_head); |
| 927 | } |
| 928 | |
| 929 | /** |
| 930 | * rpc_add_pipe_dir_object - associate a rpc_pipe_dir_object to a directory |
| 931 | * @net: pointer to struct net |
| 932 | * @pdh: pointer to struct rpc_pipe_dir_head |
| 933 | * @pdo: pointer to struct rpc_pipe_dir_object |
| 934 | * |
| 935 | */ |
| 936 | int |
| 937 | rpc_add_pipe_dir_object(struct net *net, |
| 938 | struct rpc_pipe_dir_head *pdh, |
| 939 | struct rpc_pipe_dir_object *pdo) |
| 940 | { |
| 941 | int ret = 0; |
| 942 | |
| 943 | if (list_empty(&pdo->pdo_head)) { |
| 944 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 945 | |
| 946 | mutex_lock(&sn->pipefs_sb_lock); |
| 947 | ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo); |
| 948 | mutex_unlock(&sn->pipefs_sb_lock); |
| 949 | } |
| 950 | return ret; |
| 951 | } |
| 952 | EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object); |
| 953 | |
| 954 | /** |
| 955 | * rpc_remove_pipe_dir_object - remove a rpc_pipe_dir_object from a directory |
| 956 | * @net: pointer to struct net |
| 957 | * @pdh: pointer to struct rpc_pipe_dir_head |
| 958 | * @pdo: pointer to struct rpc_pipe_dir_object |
| 959 | * |
| 960 | */ |
| 961 | void |
| 962 | rpc_remove_pipe_dir_object(struct net *net, |
| 963 | struct rpc_pipe_dir_head *pdh, |
| 964 | struct rpc_pipe_dir_object *pdo) |
| 965 | { |
| 966 | if (!list_empty(&pdo->pdo_head)) { |
| 967 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 968 | |
| 969 | mutex_lock(&sn->pipefs_sb_lock); |
| 970 | rpc_remove_pipe_dir_object_locked(net, pdh, pdo); |
| 971 | mutex_unlock(&sn->pipefs_sb_lock); |
| 972 | } |
| 973 | } |
| 974 | EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object); |
| 975 | |
Trond Myklebust | 298fc35 | 2013-08-27 16:27:04 -0400 | [diff] [blame] | 976 | /** |
| 977 | * rpc_find_or_alloc_pipe_dir_object |
| 978 | * @net: pointer to struct net |
| 979 | * @pdh: pointer to struct rpc_pipe_dir_head |
| 980 | * @match: match struct rpc_pipe_dir_object to data |
| 981 | * @alloc: allocate a new struct rpc_pipe_dir_object |
| 982 | * @data: user defined data for match() and alloc() |
| 983 | * |
| 984 | */ |
| 985 | struct rpc_pipe_dir_object * |
| 986 | rpc_find_or_alloc_pipe_dir_object(struct net *net, |
| 987 | struct rpc_pipe_dir_head *pdh, |
| 988 | int (*match)(struct rpc_pipe_dir_object *, void *), |
| 989 | struct rpc_pipe_dir_object *(*alloc)(void *), |
| 990 | void *data) |
| 991 | { |
| 992 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 993 | struct rpc_pipe_dir_object *pdo; |
| 994 | |
| 995 | mutex_lock(&sn->pipefs_sb_lock); |
| 996 | list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) { |
| 997 | if (!match(pdo, data)) |
| 998 | continue; |
| 999 | goto out; |
| 1000 | } |
| 1001 | pdo = alloc(data); |
| 1002 | if (!pdo) |
| 1003 | goto out; |
| 1004 | rpc_add_pipe_dir_object_locked(net, pdh, pdo); |
| 1005 | out: |
| 1006 | mutex_unlock(&sn->pipefs_sb_lock); |
| 1007 | return pdo; |
| 1008 | } |
| 1009 | EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object); |
| 1010 | |
Trond Myklebust | 6739ffb | 2013-08-26 15:38:11 -0400 | [diff] [blame] | 1011 | static void |
| 1012 | rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) |
| 1013 | { |
| 1014 | struct rpc_pipe_dir_object *pdo; |
| 1015 | struct dentry *dir = pdh->pdh_dentry; |
| 1016 | |
| 1017 | list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) |
| 1018 | pdo->pdo_ops->create(dir, pdo); |
| 1019 | } |
| 1020 | |
| 1021 | static void |
| 1022 | rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) |
| 1023 | { |
| 1024 | struct rpc_pipe_dir_object *pdo; |
| 1025 | struct dentry *dir = pdh->pdh_dentry; |
| 1026 | |
| 1027 | list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) |
| 1028 | pdo->pdo_ops->destroy(dir, pdo); |
| 1029 | } |
| 1030 | |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 1031 | enum { |
| 1032 | RPCAUTH_info, |
| 1033 | RPCAUTH_EOF |
| 1034 | }; |
| 1035 | |
| 1036 | static const struct rpc_filelist authfiles[] = { |
| 1037 | [RPCAUTH_info] = { |
| 1038 | .name = "info", |
| 1039 | .i_fop = &rpc_info_operations, |
| 1040 | .mode = S_IFREG | S_IRUSR, |
| 1041 | }, |
| 1042 | }; |
| 1043 | |
| 1044 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) |
| 1045 | { |
| 1046 | return rpc_populate(dentry, |
| 1047 | authfiles, RPCAUTH_info, RPCAUTH_EOF, |
| 1048 | private); |
| 1049 | } |
| 1050 | |
| 1051 | static void rpc_clntdir_depopulate(struct dentry *dentry) |
| 1052 | { |
| 1053 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); |
| 1054 | } |
| 1055 | |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 1056 | /** |
| 1057 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs |
Al Viro | a95e691 | 2013-07-14 16:43:54 +0400 | [diff] [blame] | 1058 | * @dentry: the parent of new directory |
| 1059 | * @name: the name of new directory |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 1060 | * @rpc_client: rpc client to associate with this directory |
| 1061 | * |
| 1062 | * This creates a directory at the given @path associated with |
| 1063 | * @rpc_clnt, which will contain a file named "info" with some basic |
| 1064 | * information about the client, together with any "pipes" that may |
| 1065 | * later be created using rpc_mkpipe(). |
| 1066 | */ |
Trond Myklebust | 23ac658 | 2009-08-09 15:14:25 -0400 | [diff] [blame] | 1067 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
Al Viro | a95e691 | 2013-07-14 16:43:54 +0400 | [diff] [blame] | 1068 | const char *name, |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 1069 | struct rpc_clnt *rpc_client) |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 1070 | { |
Trond Myklebust | 6739ffb | 2013-08-26 15:38:11 -0400 | [diff] [blame] | 1071 | struct dentry *ret; |
| 1072 | |
| 1073 | ret = rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 1074 | rpc_clntdir_populate, rpc_client); |
Trond Myklebust | 6739ffb | 2013-08-26 15:38:11 -0400 | [diff] [blame] | 1075 | if (!IS_ERR(ret)) { |
| 1076 | rpc_client->cl_pipedir_objects.pdh_dentry = ret; |
| 1077 | rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects); |
| 1078 | } |
| 1079 | return ret; |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | /** |
| 1083 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() |
Trond Myklebust | 6739ffb | 2013-08-26 15:38:11 -0400 | [diff] [blame] | 1084 | * @rpc_client: rpc_client for the pipe |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 1085 | */ |
Trond Myklebust | c36dcfe1 | 2013-08-26 17:44:26 -0400 | [diff] [blame] | 1086 | int rpc_remove_client_dir(struct rpc_clnt *rpc_client) |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 1087 | { |
Trond Myklebust | c36dcfe1 | 2013-08-26 17:44:26 -0400 | [diff] [blame] | 1088 | struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry; |
| 1089 | |
| 1090 | if (dentry == NULL) |
| 1091 | return 0; |
| 1092 | rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects); |
| 1093 | rpc_client->cl_pipedir_objects.pdh_dentry = NULL; |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame] | 1094 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 1095 | } |
| 1096 | |
Trond Myklebust | 8854e82 | 2009-08-09 15:14:30 -0400 | [diff] [blame] | 1097 | static const struct rpc_filelist cache_pipefs_files[3] = { |
| 1098 | [0] = { |
| 1099 | .name = "channel", |
| 1100 | .i_fop = &cache_file_operations_pipefs, |
Trond Myklebust | 96c61cb | 2009-08-19 18:12:21 -0400 | [diff] [blame] | 1101 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
Trond Myklebust | 8854e82 | 2009-08-09 15:14:30 -0400 | [diff] [blame] | 1102 | }, |
| 1103 | [1] = { |
| 1104 | .name = "content", |
| 1105 | .i_fop = &content_file_operations_pipefs, |
| 1106 | .mode = S_IFREG|S_IRUSR, |
| 1107 | }, |
| 1108 | [2] = { |
| 1109 | .name = "flush", |
| 1110 | .i_fop = &cache_flush_operations_pipefs, |
| 1111 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
| 1112 | }, |
| 1113 | }; |
| 1114 | |
| 1115 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) |
| 1116 | { |
| 1117 | return rpc_populate(dentry, |
| 1118 | cache_pipefs_files, 0, 3, |
| 1119 | private); |
| 1120 | } |
| 1121 | |
| 1122 | static void rpc_cachedir_depopulate(struct dentry *dentry) |
| 1123 | { |
| 1124 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); |
| 1125 | } |
| 1126 | |
Al Viro | a95e691 | 2013-07-14 16:43:54 +0400 | [diff] [blame] | 1127 | struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name, |
Al Viro | 64f1426 | 2011-07-25 00:35:13 -0400 | [diff] [blame] | 1128 | umode_t umode, struct cache_detail *cd) |
Trond Myklebust | 8854e82 | 2009-08-09 15:14:30 -0400 | [diff] [blame] | 1129 | { |
| 1130 | return rpc_mkdir_populate(parent, name, umode, NULL, |
| 1131 | rpc_cachedir_populate, cd); |
| 1132 | } |
| 1133 | |
| 1134 | void rpc_remove_cache_dir(struct dentry *dentry) |
| 1135 | { |
| 1136 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); |
| 1137 | } |
| 1138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | /* |
| 1140 | * populate the filesystem |
| 1141 | */ |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1142 | static const struct super_operations s_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | .alloc_inode = rpc_alloc_inode, |
| 1144 | .destroy_inode = rpc_destroy_inode, |
| 1145 | .statfs = simple_statfs, |
| 1146 | }; |
| 1147 | |
| 1148 | #define RPCAUTH_GSSMAGIC 0x67596969 |
| 1149 | |
Trond Myklebust | bb15674 | 2009-08-09 15:14:21 -0400 | [diff] [blame] | 1150 | /* |
| 1151 | * We have a single directory with 1 node in it. |
| 1152 | */ |
| 1153 | enum { |
| 1154 | RPCAUTH_lockd, |
| 1155 | RPCAUTH_mount, |
| 1156 | RPCAUTH_nfs, |
| 1157 | RPCAUTH_portmap, |
| 1158 | RPCAUTH_statd, |
| 1159 | RPCAUTH_nfsd4_cb, |
Trond Myklebust | e571cbf | 2009-08-19 18:12:27 -0400 | [diff] [blame] | 1160 | RPCAUTH_cache, |
Jeff Layton | b3537c3 | 2012-03-21 09:52:04 -0400 | [diff] [blame] | 1161 | RPCAUTH_nfsd, |
Trond Myklebust | bb15674 | 2009-08-09 15:14:21 -0400 | [diff] [blame] | 1162 | RPCAUTH_RootEOF |
| 1163 | }; |
| 1164 | |
| 1165 | static const struct rpc_filelist files[] = { |
| 1166 | [RPCAUTH_lockd] = { |
| 1167 | .name = "lockd", |
| 1168 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 1169 | }, |
| 1170 | [RPCAUTH_mount] = { |
| 1171 | .name = "mount", |
| 1172 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 1173 | }, |
| 1174 | [RPCAUTH_nfs] = { |
| 1175 | .name = "nfs", |
| 1176 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 1177 | }, |
| 1178 | [RPCAUTH_portmap] = { |
| 1179 | .name = "portmap", |
| 1180 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 1181 | }, |
| 1182 | [RPCAUTH_statd] = { |
| 1183 | .name = "statd", |
| 1184 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 1185 | }, |
| 1186 | [RPCAUTH_nfsd4_cb] = { |
| 1187 | .name = "nfsd4_cb", |
| 1188 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 1189 | }, |
Trond Myklebust | e571cbf | 2009-08-19 18:12:27 -0400 | [diff] [blame] | 1190 | [RPCAUTH_cache] = { |
| 1191 | .name = "cache", |
| 1192 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 1193 | }, |
Jeff Layton | b3537c3 | 2012-03-21 09:52:04 -0400 | [diff] [blame] | 1194 | [RPCAUTH_nfsd] = { |
| 1195 | .name = "nfsd", |
| 1196 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 1197 | }, |
Trond Myklebust | bb15674 | 2009-08-09 15:14:21 -0400 | [diff] [blame] | 1198 | }; |
| 1199 | |
Stanislav Kinsbursky | 432eb1a | 2011-12-26 15:39:22 +0300 | [diff] [blame] | 1200 | /* |
| 1201 | * This call can be used only in RPC pipefs mount notification hooks. |
| 1202 | */ |
| 1203 | struct dentry *rpc_d_lookup_sb(const struct super_block *sb, |
| 1204 | const unsigned char *dir_name) |
| 1205 | { |
Linus Torvalds | 26fe575 | 2012-05-10 13:14:12 -0700 | [diff] [blame] | 1206 | struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name)); |
Al Viro | d3db90b | 2013-07-14 17:09:57 +0400 | [diff] [blame] | 1207 | return d_hash_and_lookup(sb->s_root, &dir); |
Stanislav Kinsbursky | 432eb1a | 2011-12-26 15:39:22 +0300 | [diff] [blame] | 1208 | } |
| 1209 | EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); |
| 1210 | |
Stanislav Kinsbursky | c21a588 | 2011-12-26 15:39:39 +0300 | [diff] [blame] | 1211 | void rpc_pipefs_init_net(struct net *net) |
| 1212 | { |
| 1213 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1214 | |
| 1215 | mutex_init(&sn->pipefs_sb_lock); |
Trond Myklebust | abfdbd5 | 2013-05-15 11:28:54 -0700 | [diff] [blame] | 1216 | sn->gssd_running = 1; |
Trond Myklebust | 2aed8b4 | 2013-05-15 10:27:32 -0700 | [diff] [blame] | 1217 | sn->pipe_version = -1; |
Stanislav Kinsbursky | c21a588 | 2011-12-26 15:39:39 +0300 | [diff] [blame] | 1218 | } |
| 1219 | |
| 1220 | /* |
| 1221 | * This call will be used for per network namespace operations calls. |
| 1222 | * Note: Function will be returned with pipefs_sb_lock taken if superblock was |
| 1223 | * found. This lock have to be released by rpc_put_sb_net() when all operations |
| 1224 | * will be completed. |
| 1225 | */ |
| 1226 | struct super_block *rpc_get_sb_net(const struct net *net) |
| 1227 | { |
| 1228 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1229 | |
| 1230 | mutex_lock(&sn->pipefs_sb_lock); |
| 1231 | if (sn->pipefs_sb) |
| 1232 | return sn->pipefs_sb; |
| 1233 | mutex_unlock(&sn->pipefs_sb_lock); |
| 1234 | return NULL; |
| 1235 | } |
| 1236 | EXPORT_SYMBOL_GPL(rpc_get_sb_net); |
| 1237 | |
| 1238 | void rpc_put_sb_net(const struct net *net) |
| 1239 | { |
| 1240 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1241 | |
Weston Andros Adamson | 749386e | 2012-10-23 10:43:37 -0400 | [diff] [blame] | 1242 | WARN_ON(sn->pipefs_sb == NULL); |
Stanislav Kinsbursky | c21a588 | 2011-12-26 15:39:39 +0300 | [diff] [blame] | 1243 | mutex_unlock(&sn->pipefs_sb_lock); |
| 1244 | } |
| 1245 | EXPORT_SYMBOL_GPL(rpc_put_sb_net); |
| 1246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | static int |
| 1248 | rpc_fill_super(struct super_block *sb, void *data, int silent) |
| 1249 | { |
| 1250 | struct inode *inode; |
| 1251 | struct dentry *root; |
Stanislav Kinsbursky | 38b0da7 | 2011-12-26 15:38:56 +0300 | [diff] [blame] | 1252 | struct net *net = data; |
Stanislav Kinsbursky | 90c4e82 | 2011-12-26 15:39:30 +0300 | [diff] [blame] | 1253 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
Stanislav Kinsbursky | 2d00131 | 2011-12-26 15:39:13 +0300 | [diff] [blame] | 1254 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | |
| 1256 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 1257 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 1258 | sb->s_magic = RPCAUTH_GSSMAGIC; |
| 1259 | sb->s_op = &s_ops; |
Al Viro | b26d4cd | 2013-10-25 18:47:37 -0400 | [diff] [blame] | 1260 | sb->s_d_op = &simple_dentry_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | sb->s_time_gran = 1; |
| 1262 | |
Jeff Layton | 7e450b4 | 2012-05-16 13:04:26 -0400 | [diff] [blame] | 1263 | inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 1264 | sb->s_root = root = d_make_root(inode); |
| 1265 | if (!root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | return -ENOMEM; |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 1267 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
Al Viro | fc7bed8 | 2010-01-25 18:30:38 -0500 | [diff] [blame] | 1268 | return -ENOMEM; |
Chuck Lever | d8af9bc1 | 2012-09-14 17:23:34 -0400 | [diff] [blame] | 1269 | dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", |
| 1270 | net, NET_NAME(net)); |
Stanislav Kinsbursky | 3848160 | 2013-06-24 11:52:38 +0400 | [diff] [blame] | 1271 | mutex_lock(&sn->pipefs_sb_lock); |
Stanislav Kinsbursky | 37629b5 | 2012-04-20 18:19:56 +0400 | [diff] [blame] | 1272 | sn->pipefs_sb = sb; |
Stanislav Kinsbursky | 2d00131 | 2011-12-26 15:39:13 +0300 | [diff] [blame] | 1273 | err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
| 1274 | RPC_PIPEFS_MOUNT, |
| 1275 | sb); |
| 1276 | if (err) |
| 1277 | goto err_depopulate; |
Stanislav Kinsbursky | 021c68d | 2011-12-26 15:39:04 +0300 | [diff] [blame] | 1278 | sb->s_fs_info = get_net(net); |
Stanislav Kinsbursky | 3848160 | 2013-06-24 11:52:38 +0400 | [diff] [blame] | 1279 | mutex_unlock(&sn->pipefs_sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | return 0; |
Stanislav Kinsbursky | 2d00131 | 2011-12-26 15:39:13 +0300 | [diff] [blame] | 1281 | |
| 1282 | err_depopulate: |
| 1283 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
| 1284 | RPC_PIPEFS_UMOUNT, |
| 1285 | sb); |
Stanislav Kinsbursky | 37629b5 | 2012-04-20 18:19:56 +0400 | [diff] [blame] | 1286 | sn->pipefs_sb = NULL; |
Stanislav Kinsbursky | 2d00131 | 2011-12-26 15:39:13 +0300 | [diff] [blame] | 1287 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); |
Stanislav Kinsbursky | 3848160 | 2013-06-24 11:52:38 +0400 | [diff] [blame] | 1288 | mutex_unlock(&sn->pipefs_sb_lock); |
Stanislav Kinsbursky | 2d00131 | 2011-12-26 15:39:13 +0300 | [diff] [blame] | 1289 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | } |
| 1291 | |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1292 | static struct dentry * |
| 1293 | rpc_mount(struct file_system_type *fs_type, |
| 1294 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | { |
Stanislav Kinsbursky | 38b0da7 | 2011-12-26 15:38:56 +0300 | [diff] [blame] | 1296 | return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | } |
| 1298 | |
Trond Myklebust | 09acfea | 2012-03-11 15:22:54 -0400 | [diff] [blame] | 1299 | static void rpc_kill_sb(struct super_block *sb) |
Stanislav Kinsbursky | 021c68d | 2011-12-26 15:39:04 +0300 | [diff] [blame] | 1300 | { |
| 1301 | struct net *net = sb->s_fs_info; |
Stanislav Kinsbursky | 90c4e82 | 2011-12-26 15:39:30 +0300 | [diff] [blame] | 1302 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
Stanislav Kinsbursky | 021c68d | 2011-12-26 15:39:04 +0300 | [diff] [blame] | 1303 | |
Stanislav Kinsbursky | c21a588 | 2011-12-26 15:39:39 +0300 | [diff] [blame] | 1304 | mutex_lock(&sn->pipefs_sb_lock); |
Trond Myklebust | 642fe4d | 2012-11-08 10:01:26 -0500 | [diff] [blame] | 1305 | if (sn->pipefs_sb != sb) { |
| 1306 | mutex_unlock(&sn->pipefs_sb_lock); |
| 1307 | goto out; |
| 1308 | } |
Stanislav Kinsbursky | 90c4e82 | 2011-12-26 15:39:30 +0300 | [diff] [blame] | 1309 | sn->pipefs_sb = NULL; |
Chuck Lever | d8af9bc1 | 2012-09-14 17:23:34 -0400 | [diff] [blame] | 1310 | dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", |
| 1311 | net, NET_NAME(net)); |
Stanislav Kinsbursky | 2d00131 | 2011-12-26 15:39:13 +0300 | [diff] [blame] | 1312 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
| 1313 | RPC_PIPEFS_UMOUNT, |
| 1314 | sb); |
Stanislav Kinsbursky | adb6fa7 | 2013-06-26 10:15:14 +0400 | [diff] [blame] | 1315 | mutex_unlock(&sn->pipefs_sb_lock); |
Trond Myklebust | 642fe4d | 2012-11-08 10:01:26 -0500 | [diff] [blame] | 1316 | put_net(net); |
| 1317 | out: |
Stanislav Kinsbursky | 021c68d | 2011-12-26 15:39:04 +0300 | [diff] [blame] | 1318 | kill_litter_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | } |
| 1320 | |
| 1321 | static struct file_system_type rpc_pipe_fs_type = { |
| 1322 | .owner = THIS_MODULE, |
| 1323 | .name = "rpc_pipefs", |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1324 | .mount = rpc_mount, |
Stanislav Kinsbursky | 021c68d | 2011-12-26 15:39:04 +0300 | [diff] [blame] | 1325 | .kill_sb = rpc_kill_sb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 1327 | MODULE_ALIAS_FS("rpc_pipefs"); |
Eric W. Biederman | fa7614dd | 2013-03-12 18:27:41 -0700 | [diff] [blame] | 1328 | MODULE_ALIAS("rpc_pipefs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | |
| 1330 | static void |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1331 | init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | { |
| 1333 | struct rpc_inode *rpci = (struct rpc_inode *) foo; |
| 1334 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 1335 | inode_init_once(&rpci->vfs_inode); |
| 1336 | rpci->private = NULL; |
Stanislav Kinsbursky | ba9e097 | 2011-12-26 15:43:32 +0300 | [diff] [blame] | 1337 | rpci->pipe = NULL; |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 1338 | init_waitqueue_head(&rpci->waitq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | } |
| 1340 | |
| 1341 | int register_rpc_pipefs(void) |
| 1342 | { |
Akinobu Mita | 5bd5f58 | 2007-05-09 02:34:51 -0700 | [diff] [blame] | 1343 | int err; |
| 1344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 1346 | sizeof(struct rpc_inode), |
| 1347 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
| 1348 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1349 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | if (!rpc_inode_cachep) |
| 1351 | return -ENOMEM; |
Stanislav Kinsbursky | 80df9d2 | 2012-01-11 19:18:17 +0400 | [diff] [blame] | 1352 | err = rpc_clients_notifier_register(); |
| 1353 | if (err) |
| 1354 | goto err_notifier; |
Akinobu Mita | 5bd5f58 | 2007-05-09 02:34:51 -0700 | [diff] [blame] | 1355 | err = register_filesystem(&rpc_pipe_fs_type); |
Stanislav Kinsbursky | 80df9d2 | 2012-01-11 19:18:17 +0400 | [diff] [blame] | 1356 | if (err) |
| 1357 | goto err_register; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | return 0; |
Stanislav Kinsbursky | 80df9d2 | 2012-01-11 19:18:17 +0400 | [diff] [blame] | 1359 | |
| 1360 | err_register: |
| 1361 | rpc_clients_notifier_unregister(); |
| 1362 | err_notifier: |
| 1363 | kmem_cache_destroy(rpc_inode_cachep); |
| 1364 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | } |
| 1366 | |
| 1367 | void unregister_rpc_pipefs(void) |
| 1368 | { |
Stanislav Kinsbursky | 80df9d2 | 2012-01-11 19:18:17 +0400 | [diff] [blame] | 1369 | rpc_clients_notifier_unregister(); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1370 | kmem_cache_destroy(rpc_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | unregister_filesystem(&rpc_pipe_fs_type); |
| 1372 | } |