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> |
| 19 | |
| 20 | #include <asm/ioctls.h> |
| 21 | #include <linux/fs.h> |
| 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> |
| 29 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 30 | static struct vfsmount *rpc_mount __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | static int rpc_mount_count; |
| 32 | |
| 33 | static struct file_system_type rpc_pipe_fs_type; |
| 34 | |
| 35 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 36 | static struct kmem_cache *rpc_inode_cachep __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #define RPC_UPCALL_TIMEOUT (30*HZ) |
| 39 | |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 40 | static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head, |
| 41 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) |
Trond Myklebust | b3eb67a | 2005-11-25 17:10:11 -0500 | [diff] [blame] | 42 | { |
| 43 | struct rpc_pipe_msg *msg; |
Trond Myklebust | b3eb67a | 2005-11-25 17:10:11 -0500 | [diff] [blame] | 44 | |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 45 | if (list_empty(head)) |
| 46 | return; |
| 47 | do { |
Trond Myklebust | b3eb67a | 2005-11-25 17:10:11 -0500 | [diff] [blame] | 48 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 49 | list_del(&msg->list); |
Trond Myklebust | b3eb67a | 2005-11-25 17:10:11 -0500 | [diff] [blame] | 50 | msg->errno = err; |
| 51 | destroy_msg(msg); |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 52 | } while (!list_empty(head)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | wake_up(&rpci->waitq); |
| 54 | } |
| 55 | |
| 56 | static void |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 57 | rpc_timeout_upcall_queue(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | { |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 59 | LIST_HEAD(free_list); |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 60 | struct rpc_inode *rpci = |
| 61 | container_of(work, struct rpc_inode, queue_timeout.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | struct inode *inode = &rpci->vfs_inode; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 63 | void (*destroy_msg)(struct rpc_pipe_msg *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 65 | spin_lock(&inode->i_lock); |
| 66 | if (rpci->ops == NULL) { |
| 67 | spin_unlock(&inode->i_lock); |
| 68 | return; |
| 69 | } |
| 70 | destroy_msg = rpci->ops->destroy_msg; |
| 71 | if (rpci->nreaders == 0) { |
| 72 | list_splice_init(&rpci->pipe, &free_list); |
| 73 | rpci->pipelen = 0; |
| 74 | } |
| 75 | spin_unlock(&inode->i_lock); |
| 76 | rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 79 | /** |
| 80 | * rpc_queue_upcall |
| 81 | * @inode: inode of upcall pipe on which to queue given message |
| 82 | * @msg: message to queue |
| 83 | * |
| 84 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. |
| 85 | * A userspace process may then later read the upcall by performing a |
| 86 | * read on an open file for this inode. It is up to the caller to |
| 87 | * initialize the fields of @msg (other than @msg->list) appropriately. |
| 88 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | int |
| 90 | rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) |
| 91 | { |
| 92 | struct rpc_inode *rpci = RPC_I(inode); |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 93 | int res = -EPIPE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 95 | spin_lock(&inode->i_lock); |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 96 | if (rpci->ops == NULL) |
| 97 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | if (rpci->nreaders) { |
| 99 | list_add_tail(&msg->list, &rpci->pipe); |
| 100 | rpci->pipelen += msg->len; |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 101 | res = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
| 103 | if (list_empty(&rpci->pipe)) |
Trond Myklebust | 24c5d9d | 2006-03-20 13:44:08 -0500 | [diff] [blame] | 104 | queue_delayed_work(rpciod_workqueue, |
| 105 | &rpci->queue_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | RPC_UPCALL_TIMEOUT); |
| 107 | list_add_tail(&msg->list, &rpci->pipe); |
| 108 | rpci->pipelen += msg->len; |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 109 | res = 0; |
| 110 | } |
| 111 | out: |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 112 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | wake_up(&rpci->waitq); |
| 114 | return res; |
| 115 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 116 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 118 | static inline void |
| 119 | rpc_inode_setowner(struct inode *inode, void *private) |
| 120 | { |
| 121 | RPC_I(inode)->private = private; |
| 122 | } |
| 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | static void |
| 125 | rpc_close_pipes(struct inode *inode) |
| 126 | { |
| 127 | struct rpc_inode *rpci = RPC_I(inode); |
Trond Myklebust | b693ba4 | 2009-08-09 15:14:15 -0400 | [diff] [blame] | 128 | const struct rpc_pipe_ops *ops; |
\"J. Bruce Fields\ | e712804 | 2008-12-23 16:09:47 -0500 | [diff] [blame] | 129 | int need_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 131 | mutex_lock(&inode->i_mutex); |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 132 | ops = rpci->ops; |
| 133 | if (ops != NULL) { |
| 134 | LIST_HEAD(free_list); |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 135 | spin_lock(&inode->i_lock); |
\"J. Bruce Fields\ | e712804 | 2008-12-23 16:09:47 -0500 | [diff] [blame] | 136 | need_release = rpci->nreaders != 0 || rpci->nwriters != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | rpci->nreaders = 0; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 138 | list_splice_init(&rpci->in_upcall, &free_list); |
| 139 | list_splice_init(&rpci->pipe, &free_list); |
| 140 | rpci->pipelen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | rpci->ops = NULL; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 142 | spin_unlock(&inode->i_lock); |
| 143 | rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); |
| 144 | rpci->nwriters = 0; |
\"J. Bruce Fields\ | e712804 | 2008-12-23 16:09:47 -0500 | [diff] [blame] | 145 | if (need_release && ops->release_pipe) |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 146 | ops->release_pipe(inode); |
Trond Myklebust | 4011cd9 | 2007-08-07 15:33:01 -0400 | [diff] [blame] | 147 | cancel_delayed_work_sync(&rpci->queue_timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 149 | rpc_inode_setowner(inode, NULL); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 150 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | } |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | static struct inode * |
| 154 | rpc_alloc_inode(struct super_block *sb) |
| 155 | { |
| 156 | struct rpc_inode *rpci; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 157 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | if (!rpci) |
| 159 | return NULL; |
| 160 | return &rpci->vfs_inode; |
| 161 | } |
| 162 | |
| 163 | static void |
| 164 | rpc_destroy_inode(struct inode *inode) |
| 165 | { |
| 166 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
| 167 | } |
| 168 | |
| 169 | static int |
| 170 | rpc_pipe_open(struct inode *inode, struct file *filp) |
| 171 | { |
| 172 | struct rpc_inode *rpci = RPC_I(inode); |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 173 | int first_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | int res = -ENXIO; |
| 175 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 176 | mutex_lock(&inode->i_mutex); |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 177 | if (rpci->ops == NULL) |
| 178 | goto out; |
| 179 | first_open = rpci->nreaders == 0 && rpci->nwriters == 0; |
| 180 | if (first_open && rpci->ops->open_pipe) { |
| 181 | res = rpci->ops->open_pipe(inode); |
| 182 | if (res) |
| 183 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | } |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 185 | if (filp->f_mode & FMODE_READ) |
| 186 | rpci->nreaders++; |
| 187 | if (filp->f_mode & FMODE_WRITE) |
| 188 | rpci->nwriters++; |
| 189 | res = 0; |
| 190 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 191 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | return res; |
| 193 | } |
| 194 | |
| 195 | static int |
| 196 | rpc_pipe_release(struct inode *inode, struct file *filp) |
| 197 | { |
Trond Myklebust | 969b7f2 | 2006-01-03 09:55:36 +0100 | [diff] [blame] | 198 | struct rpc_inode *rpci = RPC_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | struct rpc_pipe_msg *msg; |
\"J. Bruce Fields\ | e712804 | 2008-12-23 16:09:47 -0500 | [diff] [blame] | 200 | int last_close; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 202 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | if (rpci->ops == NULL) |
| 204 | goto out; |
| 205 | msg = (struct rpc_pipe_msg *)filp->private_data; |
| 206 | if (msg != NULL) { |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 207 | spin_lock(&inode->i_lock); |
Trond Myklebust | 48e4918 | 2005-12-19 17:11:22 -0500 | [diff] [blame] | 208 | msg->errno = -EAGAIN; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 209 | list_del(&msg->list); |
| 210 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | rpci->ops->destroy_msg(msg); |
| 212 | } |
| 213 | if (filp->f_mode & FMODE_WRITE) |
| 214 | rpci->nwriters --; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 215 | if (filp->f_mode & FMODE_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | rpci->nreaders --; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 217 | if (rpci->nreaders == 0) { |
| 218 | LIST_HEAD(free_list); |
| 219 | spin_lock(&inode->i_lock); |
| 220 | list_splice_init(&rpci->pipe, &free_list); |
| 221 | rpci->pipelen = 0; |
| 222 | spin_unlock(&inode->i_lock); |
| 223 | rpc_purge_list(rpci, &free_list, |
| 224 | rpci->ops->destroy_msg, -EAGAIN); |
| 225 | } |
| 226 | } |
\"J. Bruce Fields\ | e712804 | 2008-12-23 16:09:47 -0500 | [diff] [blame] | 227 | last_close = rpci->nwriters == 0 && rpci->nreaders == 0; |
| 228 | if (last_close && rpci->ops->release_pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | rpci->ops->release_pipe(inode); |
| 230 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 231 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | static ssize_t |
| 236 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) |
| 237 | { |
Josef Sipek | 303b46b | 2006-12-08 02:37:42 -0800 | [diff] [blame] | 238 | struct inode *inode = filp->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | struct rpc_inode *rpci = RPC_I(inode); |
| 240 | struct rpc_pipe_msg *msg; |
| 241 | int res = 0; |
| 242 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 243 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | if (rpci->ops == NULL) { |
| 245 | res = -EPIPE; |
| 246 | goto out_unlock; |
| 247 | } |
| 248 | msg = filp->private_data; |
| 249 | if (msg == NULL) { |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 250 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | if (!list_empty(&rpci->pipe)) { |
| 252 | msg = list_entry(rpci->pipe.next, |
| 253 | struct rpc_pipe_msg, |
| 254 | list); |
| 255 | list_move(&msg->list, &rpci->in_upcall); |
| 256 | rpci->pipelen -= msg->len; |
| 257 | filp->private_data = msg; |
| 258 | msg->copied = 0; |
| 259 | } |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 260 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | if (msg == NULL) |
| 262 | goto out_unlock; |
| 263 | } |
| 264 | /* NOTE: it is up to the callback to update msg->copied */ |
| 265 | res = rpci->ops->upcall(filp, msg, buf, len); |
| 266 | if (res < 0 || msg->len == msg->copied) { |
| 267 | filp->private_data = NULL; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 268 | spin_lock(&inode->i_lock); |
| 269 | list_del(&msg->list); |
| 270 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | rpci->ops->destroy_msg(msg); |
| 272 | } |
| 273 | out_unlock: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 274 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | return res; |
| 276 | } |
| 277 | |
| 278 | static ssize_t |
| 279 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) |
| 280 | { |
Josef Sipek | 303b46b | 2006-12-08 02:37:42 -0800 | [diff] [blame] | 281 | struct inode *inode = filp->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | struct rpc_inode *rpci = RPC_I(inode); |
| 283 | int res; |
| 284 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 285 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | res = -EPIPE; |
| 287 | if (rpci->ops != NULL) |
| 288 | res = rpci->ops->downcall(filp, buf, len); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 289 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | return res; |
| 291 | } |
| 292 | |
| 293 | static unsigned int |
| 294 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) |
| 295 | { |
| 296 | struct rpc_inode *rpci; |
| 297 | unsigned int mask = 0; |
| 298 | |
Josef Sipek | 303b46b | 2006-12-08 02:37:42 -0800 | [diff] [blame] | 299 | rpci = RPC_I(filp->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | poll_wait(filp, &rpci->waitq, wait); |
| 301 | |
| 302 | mask = POLLOUT | POLLWRNORM; |
| 303 | if (rpci->ops == NULL) |
| 304 | mask |= POLLERR | POLLHUP; |
J. Bruce Fields | eda4f9b | 2007-11-06 13:05:36 -0500 | [diff] [blame] | 305 | if (filp->private_data || !list_empty(&rpci->pipe)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | mask |= POLLIN | POLLRDNORM; |
| 307 | return mask; |
| 308 | } |
| 309 | |
| 310 | static int |
| 311 | rpc_pipe_ioctl(struct inode *ino, struct file *filp, |
| 312 | unsigned int cmd, unsigned long arg) |
| 313 | { |
Josef Sipek | 303b46b | 2006-12-08 02:37:42 -0800 | [diff] [blame] | 314 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | int len; |
| 316 | |
| 317 | switch (cmd) { |
| 318 | case FIONREAD: |
| 319 | if (rpci->ops == NULL) |
| 320 | return -EPIPE; |
| 321 | len = rpci->pipelen; |
| 322 | if (filp->private_data) { |
| 323 | struct rpc_pipe_msg *msg; |
| 324 | msg = (struct rpc_pipe_msg *)filp->private_data; |
| 325 | len += msg->len - msg->copied; |
| 326 | } |
| 327 | return put_user(len, (int __user *)arg); |
| 328 | default: |
| 329 | return -EINVAL; |
| 330 | } |
| 331 | } |
| 332 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 333 | static const struct file_operations rpc_pipe_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | .owner = THIS_MODULE, |
| 335 | .llseek = no_llseek, |
| 336 | .read = rpc_pipe_read, |
| 337 | .write = rpc_pipe_write, |
| 338 | .poll = rpc_pipe_poll, |
| 339 | .ioctl = rpc_pipe_ioctl, |
| 340 | .open = rpc_pipe_open, |
| 341 | .release = rpc_pipe_release, |
| 342 | }; |
| 343 | |
| 344 | static int |
| 345 | rpc_show_info(struct seq_file *m, void *v) |
| 346 | { |
| 347 | struct rpc_clnt *clnt = m->private; |
| 348 | |
| 349 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); |
| 350 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, |
| 351 | clnt->cl_prog, clnt->cl_vers); |
Chuck Lever | e7f7865 | 2006-08-22 20:06:19 -0400 | [diff] [blame] | 352 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
| 353 | 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] | 354 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | static int |
| 359 | rpc_info_open(struct inode *inode, struct file *file) |
| 360 | { |
| 361 | struct rpc_clnt *clnt; |
| 362 | int ret = single_open(file, rpc_show_info, NULL); |
| 363 | |
| 364 | if (!ret) { |
| 365 | struct seq_file *m = file->private_data; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 366 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | clnt = RPC_I(inode)->private; |
| 368 | if (clnt) { |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 369 | kref_get(&clnt->cl_kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | m->private = clnt; |
| 371 | } else { |
| 372 | single_release(inode, file); |
| 373 | ret = -EINVAL; |
| 374 | } |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 375 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
| 377 | return ret; |
| 378 | } |
| 379 | |
| 380 | static int |
| 381 | rpc_info_release(struct inode *inode, struct file *file) |
| 382 | { |
| 383 | struct seq_file *m = file->private_data; |
| 384 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; |
| 385 | |
| 386 | if (clnt) |
| 387 | rpc_release_client(clnt); |
| 388 | return single_release(inode, file); |
| 389 | } |
| 390 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 391 | static const struct file_operations rpc_info_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | .owner = THIS_MODULE, |
| 393 | .open = rpc_info_open, |
| 394 | .read = seq_read, |
| 395 | .llseek = seq_lseek, |
| 396 | .release = rpc_info_release, |
| 397 | }; |
| 398 | |
| 399 | |
| 400 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | * Description of fs contents. |
| 402 | */ |
| 403 | struct rpc_filelist { |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 404 | const char *name; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 405 | const struct file_operations *i_fop; |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 406 | umode_t mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | }; |
| 408 | |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 409 | struct vfsmount *rpc_get_mount(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | { |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 411 | int err; |
| 412 | |
Trond Myklebust | 1f5ce9e | 2006-06-09 09:34:16 -0400 | [diff] [blame] | 413 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count); |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 414 | if (err != 0) |
| 415 | return ERR_PTR(err); |
| 416 | return rpc_mount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 419 | void rpc_put_mount(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | { |
| 421 | simple_release_fs(&rpc_mount, &rpc_mount_count); |
| 422 | } |
| 423 | |
Trond Myklebust | 62e1761 | 2007-06-08 14:14:46 -0400 | [diff] [blame] | 424 | static int rpc_delete_dentry(struct dentry *dentry) |
| 425 | { |
| 426 | return 1; |
| 427 | } |
| 428 | |
Al Viro | 3ba13d1 | 2009-02-20 06:02:22 +0000 | [diff] [blame] | 429 | static const struct dentry_operations rpc_dentry_operations = { |
Trond Myklebust | 62e1761 | 2007-06-08 14:14:46 -0400 | [diff] [blame] | 430 | .d_delete = rpc_delete_dentry, |
| 431 | }; |
| 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | static struct inode * |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 434 | rpc_get_inode(struct super_block *sb, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | { |
| 436 | struct inode *inode = new_inode(sb); |
| 437 | if (!inode) |
| 438 | return NULL; |
| 439 | inode->i_mode = mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 441 | switch(mode & S_IFMT) { |
| 442 | case S_IFDIR: |
| 443 | inode->i_fop = &simple_dir_operations; |
| 444 | inode->i_op = &simple_dir_inode_operations; |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 445 | inc_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | default: |
| 447 | break; |
| 448 | } |
| 449 | return inode; |
| 450 | } |
| 451 | |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 452 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
| 453 | umode_t mode, |
| 454 | const struct file_operations *i_fop, |
| 455 | void *private) |
| 456 | { |
| 457 | struct inode *inode; |
| 458 | |
| 459 | BUG_ON(!d_unhashed(dentry)); |
| 460 | inode = rpc_get_inode(dir->i_sb, mode); |
| 461 | if (!inode) |
| 462 | goto out_err; |
| 463 | inode->i_ino = iunique(dir->i_sb, 100); |
| 464 | if (i_fop) |
| 465 | inode->i_fop = i_fop; |
| 466 | if (private) |
| 467 | rpc_inode_setowner(inode, private); |
| 468 | d_add(dentry, inode); |
| 469 | return 0; |
| 470 | out_err: |
| 471 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", |
| 472 | __FILE__, __func__, dentry->d_name.name); |
| 473 | dput(dentry); |
| 474 | return -ENOMEM; |
| 475 | } |
| 476 | |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 477 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
| 478 | umode_t mode, |
| 479 | const struct file_operations *i_fop, |
| 480 | void *private) |
| 481 | { |
| 482 | int err; |
| 483 | |
| 484 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); |
| 485 | if (err) |
| 486 | return err; |
| 487 | fsnotify_create(dir, dentry); |
| 488 | return 0; |
| 489 | } |
| 490 | |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 491 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
| 492 | umode_t mode, |
| 493 | const struct file_operations *i_fop, |
| 494 | void *private) |
| 495 | { |
| 496 | int err; |
| 497 | |
| 498 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); |
| 499 | if (err) |
| 500 | return err; |
| 501 | inc_nlink(dir); |
| 502 | fsnotify_mkdir(dir, dentry); |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, |
| 507 | umode_t mode, |
| 508 | const struct file_operations *i_fop, |
| 509 | void *private, |
| 510 | const struct rpc_pipe_ops *ops, |
| 511 | int flags) |
| 512 | { |
| 513 | struct rpc_inode *rpci; |
| 514 | int err; |
| 515 | |
| 516 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); |
| 517 | if (err) |
| 518 | return err; |
| 519 | rpci = RPC_I(dentry->d_inode); |
| 520 | rpci->nkern_readwriters = 1; |
| 521 | rpci->private = private; |
| 522 | rpci->flags = flags; |
| 523 | rpci->ops = ops; |
| 524 | fsnotify_create(dir, dentry); |
| 525 | return 0; |
| 526 | } |
| 527 | |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 528 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
| 529 | { |
| 530 | int ret; |
| 531 | |
| 532 | dget(dentry); |
| 533 | ret = simple_rmdir(dir, dentry); |
| 534 | d_delete(dentry); |
| 535 | dput(dentry); |
| 536 | return ret; |
| 537 | } |
| 538 | |
Trond Myklebust | 810d90b | 2009-08-09 15:14:18 -0400 | [diff] [blame] | 539 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
| 540 | { |
| 541 | int ret; |
| 542 | |
| 543 | dget(dentry); |
| 544 | ret = simple_unlink(dir, dentry); |
| 545 | d_delete(dentry); |
| 546 | dput(dentry); |
| 547 | return ret; |
| 548 | } |
| 549 | |
| 550 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) |
| 551 | { |
| 552 | struct inode *inode = dentry->d_inode; |
| 553 | struct rpc_inode *rpci = RPC_I(inode); |
| 554 | |
| 555 | rpci->nkern_readwriters--; |
| 556 | if (rpci->nkern_readwriters != 0) |
| 557 | return 0; |
| 558 | rpc_close_pipes(inode); |
| 559 | return __rpc_unlink(dir, dentry); |
| 560 | } |
| 561 | |
Trond Myklebust | cfeaa4a | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 562 | static struct dentry *__rpc_lookup_create(struct dentry *parent, |
| 563 | struct qstr *name) |
| 564 | { |
| 565 | struct dentry *dentry; |
| 566 | |
| 567 | dentry = d_lookup(parent, name); |
| 568 | if (!dentry) { |
| 569 | dentry = d_alloc(parent, name); |
| 570 | if (!dentry) { |
| 571 | dentry = ERR_PTR(-ENOMEM); |
| 572 | goto out_err; |
| 573 | } |
| 574 | } |
| 575 | if (!dentry->d_inode) |
| 576 | dentry->d_op = &rpc_dentry_operations; |
| 577 | out_err: |
| 578 | return dentry; |
| 579 | } |
| 580 | |
| 581 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
| 582 | struct qstr *name) |
| 583 | { |
| 584 | struct dentry *dentry; |
| 585 | |
| 586 | dentry = __rpc_lookup_create(parent, name); |
| 587 | if (dentry->d_inode == NULL) |
| 588 | return dentry; |
| 589 | dput(dentry); |
| 590 | return ERR_PTR(-EEXIST); |
| 591 | } |
| 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | /* |
| 594 | * FIXME: This probably has races. |
| 595 | */ |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 596 | static void __rpc_depopulate(struct dentry *parent, |
| 597 | const struct rpc_filelist *files, |
| 598 | int start, int eof) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | { |
| 600 | struct inode *dir = parent->d_inode; |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 601 | struct dentry *dentry; |
| 602 | struct qstr name; |
| 603 | int i; |
| 604 | |
| 605 | for (i = start; i < eof; i++) { |
| 606 | name.name = files[i].name; |
| 607 | name.len = strlen(files[i].name); |
| 608 | name.hash = full_name_hash(name.name, name.len); |
| 609 | dentry = d_lookup(parent, &name); |
| 610 | |
| 611 | if (dentry == NULL) |
| 612 | continue; |
| 613 | if (dentry->d_inode == NULL) |
| 614 | goto next; |
| 615 | switch (dentry->d_inode->i_mode & S_IFMT) { |
| 616 | default: |
| 617 | BUG(); |
| 618 | case S_IFREG: |
| 619 | __rpc_unlink(dir, dentry); |
| 620 | break; |
| 621 | case S_IFDIR: |
| 622 | __rpc_rmdir(dir, dentry); |
| 623 | } |
| 624 | next: |
| 625 | dput(dentry); |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | static void rpc_depopulate(struct dentry *parent, |
| 630 | const struct rpc_filelist *files, |
| 631 | int start, int eof) |
| 632 | { |
| 633 | struct inode *dir = parent->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 635 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 636 | __rpc_depopulate(parent, files, start, eof); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 637 | mutex_unlock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | } |
| 639 | |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 640 | static int rpc_populate(struct dentry *parent, |
| 641 | const struct rpc_filelist *files, |
| 642 | int start, int eof, |
| 643 | void *private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | { |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 645 | struct inode *dir = parent->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | struct dentry *dentry; |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 647 | int i, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 649 | mutex_lock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | for (i = start; i < eof; i++) { |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 651 | struct qstr q; |
| 652 | |
| 653 | q.name = files[i].name; |
| 654 | q.len = strlen(files[i].name); |
| 655 | q.hash = full_name_hash(q.name, q.len); |
| 656 | dentry = __rpc_lookup_create_exclusive(parent, &q); |
| 657 | err = PTR_ERR(dentry); |
| 658 | if (IS_ERR(dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | goto out_bad; |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 660 | switch (files[i].mode & S_IFMT) { |
| 661 | default: |
| 662 | BUG(); |
| 663 | case S_IFREG: |
| 664 | err = __rpc_create(dir, dentry, |
| 665 | files[i].mode, |
| 666 | files[i].i_fop, |
| 667 | private); |
| 668 | break; |
| 669 | case S_IFDIR: |
| 670 | err = __rpc_mkdir(dir, dentry, |
| 671 | files[i].mode, |
| 672 | NULL, |
| 673 | private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | } |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 675 | if (err != 0) |
| 676 | goto out_bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | } |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 678 | mutex_unlock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | return 0; |
| 680 | out_bad: |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 681 | __rpc_depopulate(parent, files, start, eof); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 682 | mutex_unlock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 684 | __FILE__, __func__, parent->d_name.name); |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 685 | return err; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 686 | } |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 687 | |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame^] | 688 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
| 689 | struct qstr *name, umode_t mode, void *private, |
| 690 | int (*populate)(struct dentry *, void *), void *args_populate) |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 691 | { |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 692 | struct dentry *dentry; |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 693 | struct inode *dir = parent->d_inode; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 694 | int error; |
| 695 | |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 696 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| 697 | dentry = __rpc_lookup_create_exclusive(parent, name); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 698 | if (IS_ERR(dentry)) |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 699 | goto out; |
| 700 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 701 | if (error != 0) |
| 702 | goto out_err; |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame^] | 703 | if (populate != NULL) { |
| 704 | error = populate(dentry, args_populate); |
| 705 | if (error) |
| 706 | goto err_rmdir; |
| 707 | } |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 708 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 709 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | 5c3e985 | 2006-07-29 17:37:40 -0400 | [diff] [blame] | 710 | return dentry; |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 711 | err_rmdir: |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 712 | __rpc_rmdir(dir, dentry); |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 713 | out_err: |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 714 | dentry = ERR_PTR(error); |
| 715 | goto out; |
| 716 | } |
| 717 | |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame^] | 718 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
| 719 | void (*depopulate)(struct dentry *)) |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 720 | { |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 721 | struct dentry *parent; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 722 | struct inode *dir; |
| 723 | int error; |
| 724 | |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 725 | parent = dget_parent(dentry); |
| 726 | dir = parent->d_inode; |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 727 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame^] | 728 | if (depopulate != NULL) |
| 729 | depopulate(dentry); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 730 | error = __rpc_rmdir(dir, dentry); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 731 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 732 | dput(parent); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 733 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 736 | /** |
| 737 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication |
| 738 | * @parent: dentry of directory to create new "pipe" in |
| 739 | * @name: name of pipe |
| 740 | * @private: private data to associate with the pipe, for the caller's use |
| 741 | * @ops: operations defining the behavior of the pipe: upcall, downcall, |
\"J. Bruce Fields\ | c381060 | 2008-12-23 16:08:32 -0500 | [diff] [blame] | 742 | * release_pipe, open_pipe, and destroy_msg. |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 743 | * @flags: rpc_inode flags |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 744 | * |
| 745 | * Data is made available for userspace to read by calls to |
| 746 | * rpc_queue_upcall(). The actual reads will result in calls to |
| 747 | * @ops->upcall, which will be called with the file pointer, |
| 748 | * message, and userspace buffer to copy to. |
| 749 | * |
| 750 | * Writes can come at any time, and do not necessarily have to be |
| 751 | * responses to upcalls. They will result in calls to @msg->downcall. |
| 752 | * |
| 753 | * The @private argument passed here will be available to all these methods |
| 754 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. |
| 755 | */ |
Trond Myklebust | b693ba4 | 2009-08-09 15:14:15 -0400 | [diff] [blame] | 756 | struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, |
| 757 | void *private, const struct rpc_pipe_ops *ops, |
| 758 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | struct dentry *dentry; |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 761 | struct inode *dir = parent->d_inode; |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 762 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
Trond Myklebust | cfeaa4a | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 763 | struct qstr q; |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 764 | int err; |
Trond Myklebust | 7364af6 | 2009-08-09 15:14:16 -0400 | [diff] [blame] | 765 | |
| 766 | if (ops->upcall == NULL) |
| 767 | umode &= ~S_IRUGO; |
| 768 | if (ops->downcall == NULL) |
| 769 | umode &= ~S_IWUGO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Trond Myklebust | cfeaa4a | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 771 | q.name = name; |
| 772 | q.len = strlen(name); |
| 773 | q.hash = full_name_hash(q.name, q.len), |
| 774 | |
| 775 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| 776 | dentry = __rpc_lookup_create(parent, &q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | if (IS_ERR(dentry)) |
Trond Myklebust | cfeaa4a | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 778 | goto out; |
Trond Myklebust | 34f3089 | 2007-06-07 18:28:02 -0400 | [diff] [blame] | 779 | if (dentry->d_inode) { |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 780 | struct rpc_inode *rpci = RPC_I(dentry->d_inode); |
Trond Myklebust | 34f3089 | 2007-06-07 18:28:02 -0400 | [diff] [blame] | 781 | if (rpci->private != private || |
| 782 | rpci->ops != ops || |
| 783 | rpci->flags != flags) { |
| 784 | dput (dentry); |
Trond Myklebust | 810d90b | 2009-08-09 15:14:18 -0400 | [diff] [blame] | 785 | err = -EBUSY; |
| 786 | goto out_err; |
Trond Myklebust | 34f3089 | 2007-06-07 18:28:02 -0400 | [diff] [blame] | 787 | } |
Trond Myklebust | 03a1256 | 2007-06-08 14:14:53 -0400 | [diff] [blame] | 788 | rpci->nkern_readwriters++; |
Trond Myklebust | 34f3089 | 2007-06-07 18:28:02 -0400 | [diff] [blame] | 789 | goto out; |
| 790 | } |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 791 | |
| 792 | err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, |
Trond Myklebust | 810d90b | 2009-08-09 15:14:18 -0400 | [diff] [blame] | 793 | private, ops, flags); |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 794 | if (err) |
| 795 | goto out_err; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 796 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 797 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | 5c3e985 | 2006-07-29 17:37:40 -0400 | [diff] [blame] | 798 | return dentry; |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 799 | out_err: |
| 800 | dentry = ERR_PTR(err); |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 801 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 802 | __FILE__, __func__, parent->d_name.name, name, |
Trond Myklebust | 7589806 | 2009-08-09 15:14:17 -0400 | [diff] [blame] | 803 | err); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 804 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 806 | EXPORT_SYMBOL_GPL(rpc_mkpipe); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
J. Bruce Fields | 93a44a7 | 2007-11-06 13:06:03 -0500 | [diff] [blame] | 808 | /** |
| 809 | * rpc_unlink - remove a pipe |
| 810 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe |
| 811 | * |
| 812 | * After this call, lookups will no longer find the pipe, and any |
| 813 | * attempts to read or write using preexisting opens of the pipe will |
| 814 | * return -EPIPE. |
| 815 | */ |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 816 | int |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 817 | rpc_unlink(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | { |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 819 | struct dentry *parent; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 820 | struct inode *dir; |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 821 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 823 | parent = dget_parent(dentry); |
| 824 | dir = parent->d_inode; |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 825 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
Trond Myklebust | 810d90b | 2009-08-09 15:14:18 -0400 | [diff] [blame] | 826 | error = __rpc_rmpipe(dir, dentry); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 827 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 828 | dput(parent); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 829 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 831 | EXPORT_SYMBOL_GPL(rpc_unlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame^] | 833 | enum { |
| 834 | RPCAUTH_info, |
| 835 | RPCAUTH_EOF |
| 836 | }; |
| 837 | |
| 838 | static const struct rpc_filelist authfiles[] = { |
| 839 | [RPCAUTH_info] = { |
| 840 | .name = "info", |
| 841 | .i_fop = &rpc_info_operations, |
| 842 | .mode = S_IFREG | S_IRUSR, |
| 843 | }, |
| 844 | }; |
| 845 | |
| 846 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) |
| 847 | { |
| 848 | return rpc_populate(dentry, |
| 849 | authfiles, RPCAUTH_info, RPCAUTH_EOF, |
| 850 | private); |
| 851 | } |
| 852 | |
| 853 | static void rpc_clntdir_depopulate(struct dentry *dentry) |
| 854 | { |
| 855 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); |
| 856 | } |
| 857 | |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 858 | /** |
| 859 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs |
| 860 | * @path: path from the rpc_pipefs root to the new directory |
| 861 | * @rpc_client: rpc client to associate with this directory |
| 862 | * |
| 863 | * This creates a directory at the given @path associated with |
| 864 | * @rpc_clnt, which will contain a file named "info" with some basic |
| 865 | * information about the client, together with any "pipes" that may |
| 866 | * later be created using rpc_mkpipe(). |
| 867 | */ |
Trond Myklebust | 23ac658 | 2009-08-09 15:14:25 -0400 | [diff] [blame] | 868 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame^] | 869 | struct qstr *name, |
| 870 | struct rpc_clnt *rpc_client) |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 871 | { |
Trond Myklebust | e57aed7 | 2009-08-09 15:14:26 -0400 | [diff] [blame^] | 872 | return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, |
| 873 | rpc_clntdir_populate, rpc_client); |
| 874 | } |
| 875 | |
| 876 | /** |
| 877 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() |
| 878 | * @dentry: directory to remove |
| 879 | */ |
| 880 | int rpc_remove_client_dir(struct dentry *dentry) |
| 881 | { |
| 882 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
Trond Myklebust | 7d59d1e | 2009-08-09 15:14:23 -0400 | [diff] [blame] | 883 | } |
| 884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | /* |
| 886 | * populate the filesystem |
| 887 | */ |
| 888 | static struct super_operations s_ops = { |
| 889 | .alloc_inode = rpc_alloc_inode, |
| 890 | .destroy_inode = rpc_destroy_inode, |
| 891 | .statfs = simple_statfs, |
| 892 | }; |
| 893 | |
| 894 | #define RPCAUTH_GSSMAGIC 0x67596969 |
| 895 | |
Trond Myklebust | bb15674 | 2009-08-09 15:14:21 -0400 | [diff] [blame] | 896 | /* |
| 897 | * We have a single directory with 1 node in it. |
| 898 | */ |
| 899 | enum { |
| 900 | RPCAUTH_lockd, |
| 901 | RPCAUTH_mount, |
| 902 | RPCAUTH_nfs, |
| 903 | RPCAUTH_portmap, |
| 904 | RPCAUTH_statd, |
| 905 | RPCAUTH_nfsd4_cb, |
| 906 | RPCAUTH_RootEOF |
| 907 | }; |
| 908 | |
| 909 | static const struct rpc_filelist files[] = { |
| 910 | [RPCAUTH_lockd] = { |
| 911 | .name = "lockd", |
| 912 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 913 | }, |
| 914 | [RPCAUTH_mount] = { |
| 915 | .name = "mount", |
| 916 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 917 | }, |
| 918 | [RPCAUTH_nfs] = { |
| 919 | .name = "nfs", |
| 920 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 921 | }, |
| 922 | [RPCAUTH_portmap] = { |
| 923 | .name = "portmap", |
| 924 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 925 | }, |
| 926 | [RPCAUTH_statd] = { |
| 927 | .name = "statd", |
| 928 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 929 | }, |
| 930 | [RPCAUTH_nfsd4_cb] = { |
| 931 | .name = "nfsd4_cb", |
| 932 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 933 | }, |
| 934 | }; |
| 935 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | static int |
| 937 | rpc_fill_super(struct super_block *sb, void *data, int silent) |
| 938 | { |
| 939 | struct inode *inode; |
| 940 | struct dentry *root; |
| 941 | |
| 942 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 943 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 944 | sb->s_magic = RPCAUTH_GSSMAGIC; |
| 945 | sb->s_op = &s_ops; |
| 946 | sb->s_time_gran = 1; |
| 947 | |
| 948 | inode = rpc_get_inode(sb, S_IFDIR | 0755); |
| 949 | if (!inode) |
| 950 | return -ENOMEM; |
| 951 | root = d_alloc_root(inode); |
| 952 | if (!root) { |
| 953 | iput(inode); |
| 954 | return -ENOMEM; |
| 955 | } |
Trond Myklebust | ac6fece | 2009-08-09 15:14:20 -0400 | [diff] [blame] | 956 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | goto out; |
| 958 | sb->s_root = root; |
| 959 | return 0; |
| 960 | out: |
| 961 | d_genocide(root); |
| 962 | dput(root); |
| 963 | return -ENOMEM; |
| 964 | } |
| 965 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 966 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | rpc_get_sb(struct file_system_type *fs_type, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 968 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 970 | return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | } |
| 972 | |
| 973 | static struct file_system_type rpc_pipe_fs_type = { |
| 974 | .owner = THIS_MODULE, |
| 975 | .name = "rpc_pipefs", |
| 976 | .get_sb = rpc_get_sb, |
| 977 | .kill_sb = kill_litter_super, |
| 978 | }; |
| 979 | |
| 980 | static void |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 981 | init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | { |
| 983 | struct rpc_inode *rpci = (struct rpc_inode *) foo; |
| 984 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 985 | inode_init_once(&rpci->vfs_inode); |
| 986 | rpci->private = NULL; |
| 987 | rpci->nreaders = 0; |
| 988 | rpci->nwriters = 0; |
| 989 | INIT_LIST_HEAD(&rpci->in_upcall); |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 990 | INIT_LIST_HEAD(&rpci->in_downcall); |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 991 | INIT_LIST_HEAD(&rpci->pipe); |
| 992 | rpci->pipelen = 0; |
| 993 | init_waitqueue_head(&rpci->waitq); |
| 994 | INIT_DELAYED_WORK(&rpci->queue_timeout, |
| 995 | rpc_timeout_upcall_queue); |
| 996 | rpci->ops = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | } |
| 998 | |
| 999 | int register_rpc_pipefs(void) |
| 1000 | { |
Akinobu Mita | 5bd5f58 | 2007-05-09 02:34:51 -0700 | [diff] [blame] | 1001 | int err; |
| 1002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 1004 | sizeof(struct rpc_inode), |
| 1005 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
| 1006 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1007 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | if (!rpc_inode_cachep) |
| 1009 | return -ENOMEM; |
Akinobu Mita | 5bd5f58 | 2007-05-09 02:34:51 -0700 | [diff] [blame] | 1010 | err = register_filesystem(&rpc_pipe_fs_type); |
| 1011 | if (err) { |
| 1012 | kmem_cache_destroy(rpc_inode_cachep); |
| 1013 | return err; |
| 1014 | } |
| 1015 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | return 0; |
| 1017 | } |
| 1018 | |
| 1019 | void unregister_rpc_pipefs(void) |
| 1020 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1021 | kmem_cache_destroy(rpc_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | unregister_filesystem(&rpc_pipe_fs_type); |
| 1023 | } |