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> |
| 17 | #include <linux/dnotify.h> |
| 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 | |
| 79 | int |
| 80 | rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) |
| 81 | { |
| 82 | struct rpc_inode *rpci = RPC_I(inode); |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 83 | int res = -EPIPE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 85 | spin_lock(&inode->i_lock); |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 86 | if (rpci->ops == NULL) |
| 87 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | if (rpci->nreaders) { |
| 89 | list_add_tail(&msg->list, &rpci->pipe); |
| 90 | rpci->pipelen += msg->len; |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 91 | res = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
| 93 | if (list_empty(&rpci->pipe)) |
Trond Myklebust | 24c5d9d | 2006-03-20 13:44:08 -0500 | [diff] [blame] | 94 | queue_delayed_work(rpciod_workqueue, |
| 95 | &rpci->queue_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | RPC_UPCALL_TIMEOUT); |
| 97 | list_add_tail(&msg->list, &rpci->pipe); |
| 98 | rpci->pipelen += msg->len; |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 99 | res = 0; |
| 100 | } |
| 101 | out: |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 102 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | wake_up(&rpci->waitq); |
| 104 | return res; |
| 105 | } |
| 106 | |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 107 | static inline void |
| 108 | rpc_inode_setowner(struct inode *inode, void *private) |
| 109 | { |
| 110 | RPC_I(inode)->private = private; |
| 111 | } |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | static void |
| 114 | rpc_close_pipes(struct inode *inode) |
| 115 | { |
| 116 | struct rpc_inode *rpci = RPC_I(inode); |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 117 | struct rpc_pipe_ops *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 119 | mutex_lock(&inode->i_mutex); |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 120 | ops = rpci->ops; |
| 121 | if (ops != NULL) { |
| 122 | LIST_HEAD(free_list); |
| 123 | |
| 124 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | rpci->nreaders = 0; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 126 | list_splice_init(&rpci->in_upcall, &free_list); |
| 127 | list_splice_init(&rpci->pipe, &free_list); |
| 128 | rpci->pipelen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | rpci->ops = NULL; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 130 | spin_unlock(&inode->i_lock); |
| 131 | rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); |
| 132 | rpci->nwriters = 0; |
| 133 | if (ops->release_pipe) |
| 134 | ops->release_pipe(inode); |
| 135 | cancel_delayed_work(&rpci->queue_timeout); |
Trond Myklebust | 24c5d9d | 2006-03-20 13:44:08 -0500 | [diff] [blame] | 136 | flush_workqueue(rpciod_workqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
Trond Myklebust | 6070fe6 | 2005-10-27 22:12:46 -0400 | [diff] [blame] | 138 | rpc_inode_setowner(inode, NULL); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 139 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | static struct inode * |
| 143 | rpc_alloc_inode(struct super_block *sb) |
| 144 | { |
| 145 | struct rpc_inode *rpci; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 146 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (!rpci) |
| 148 | return NULL; |
| 149 | return &rpci->vfs_inode; |
| 150 | } |
| 151 | |
| 152 | static void |
| 153 | rpc_destroy_inode(struct inode *inode) |
| 154 | { |
| 155 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
| 156 | } |
| 157 | |
| 158 | static int |
| 159 | rpc_pipe_open(struct inode *inode, struct file *filp) |
| 160 | { |
| 161 | struct rpc_inode *rpci = RPC_I(inode); |
| 162 | int res = -ENXIO; |
| 163 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 164 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | if (rpci->ops != NULL) { |
| 166 | if (filp->f_mode & FMODE_READ) |
| 167 | rpci->nreaders ++; |
| 168 | if (filp->f_mode & FMODE_WRITE) |
| 169 | rpci->nwriters ++; |
| 170 | res = 0; |
| 171 | } |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 172 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | return res; |
| 174 | } |
| 175 | |
| 176 | static int |
| 177 | rpc_pipe_release(struct inode *inode, struct file *filp) |
| 178 | { |
Trond Myklebust | 969b7f2 | 2006-01-03 09:55:36 +0100 | [diff] [blame] | 179 | struct rpc_inode *rpci = RPC_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | struct rpc_pipe_msg *msg; |
| 181 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 182 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | if (rpci->ops == NULL) |
| 184 | goto out; |
| 185 | msg = (struct rpc_pipe_msg *)filp->private_data; |
| 186 | if (msg != NULL) { |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 187 | spin_lock(&inode->i_lock); |
Trond Myklebust | 48e4918 | 2005-12-19 17:11:22 -0500 | [diff] [blame] | 188 | msg->errno = -EAGAIN; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 189 | list_del(&msg->list); |
| 190 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | rpci->ops->destroy_msg(msg); |
| 192 | } |
| 193 | if (filp->f_mode & FMODE_WRITE) |
| 194 | rpci->nwriters --; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 195 | if (filp->f_mode & FMODE_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | rpci->nreaders --; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 197 | if (rpci->nreaders == 0) { |
| 198 | LIST_HEAD(free_list); |
| 199 | spin_lock(&inode->i_lock); |
| 200 | list_splice_init(&rpci->pipe, &free_list); |
| 201 | rpci->pipelen = 0; |
| 202 | spin_unlock(&inode->i_lock); |
| 203 | rpc_purge_list(rpci, &free_list, |
| 204 | rpci->ops->destroy_msg, -EAGAIN); |
| 205 | } |
| 206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | if (rpci->ops->release_pipe) |
| 208 | rpci->ops->release_pipe(inode); |
| 209 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 210 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static ssize_t |
| 215 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) |
| 216 | { |
Josef Sipek | 303b46b | 2006-12-08 02:37:42 -0800 | [diff] [blame] | 217 | struct inode *inode = filp->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | struct rpc_inode *rpci = RPC_I(inode); |
| 219 | struct rpc_pipe_msg *msg; |
| 220 | int res = 0; |
| 221 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 222 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | if (rpci->ops == NULL) { |
| 224 | res = -EPIPE; |
| 225 | goto out_unlock; |
| 226 | } |
| 227 | msg = filp->private_data; |
| 228 | if (msg == NULL) { |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 229 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | if (!list_empty(&rpci->pipe)) { |
| 231 | msg = list_entry(rpci->pipe.next, |
| 232 | struct rpc_pipe_msg, |
| 233 | list); |
| 234 | list_move(&msg->list, &rpci->in_upcall); |
| 235 | rpci->pipelen -= msg->len; |
| 236 | filp->private_data = msg; |
| 237 | msg->copied = 0; |
| 238 | } |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 239 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | if (msg == NULL) |
| 241 | goto out_unlock; |
| 242 | } |
| 243 | /* NOTE: it is up to the callback to update msg->copied */ |
| 244 | res = rpci->ops->upcall(filp, msg, buf, len); |
| 245 | if (res < 0 || msg->len == msg->copied) { |
| 246 | filp->private_data = NULL; |
Trond Myklebust | 9842ef3 | 2006-02-01 12:18:44 -0500 | [diff] [blame] | 247 | spin_lock(&inode->i_lock); |
| 248 | list_del(&msg->list); |
| 249 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | rpci->ops->destroy_msg(msg); |
| 251 | } |
| 252 | out_unlock: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 253 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | return res; |
| 255 | } |
| 256 | |
| 257 | static ssize_t |
| 258 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) |
| 259 | { |
Josef Sipek | 303b46b | 2006-12-08 02:37:42 -0800 | [diff] [blame] | 260 | struct inode *inode = filp->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | struct rpc_inode *rpci = RPC_I(inode); |
| 262 | int res; |
| 263 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 264 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | res = -EPIPE; |
| 266 | if (rpci->ops != NULL) |
| 267 | res = rpci->ops->downcall(filp, buf, len); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 268 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | return res; |
| 270 | } |
| 271 | |
| 272 | static unsigned int |
| 273 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) |
| 274 | { |
| 275 | struct rpc_inode *rpci; |
| 276 | unsigned int mask = 0; |
| 277 | |
Josef Sipek | 303b46b | 2006-12-08 02:37:42 -0800 | [diff] [blame] | 278 | rpci = RPC_I(filp->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | poll_wait(filp, &rpci->waitq, wait); |
| 280 | |
| 281 | mask = POLLOUT | POLLWRNORM; |
| 282 | if (rpci->ops == NULL) |
| 283 | mask |= POLLERR | POLLHUP; |
| 284 | if (!list_empty(&rpci->pipe)) |
| 285 | mask |= POLLIN | POLLRDNORM; |
| 286 | return mask; |
| 287 | } |
| 288 | |
| 289 | static int |
| 290 | rpc_pipe_ioctl(struct inode *ino, struct file *filp, |
| 291 | unsigned int cmd, unsigned long arg) |
| 292 | { |
Josef Sipek | 303b46b | 2006-12-08 02:37:42 -0800 | [diff] [blame] | 293 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | int len; |
| 295 | |
| 296 | switch (cmd) { |
| 297 | case FIONREAD: |
| 298 | if (rpci->ops == NULL) |
| 299 | return -EPIPE; |
| 300 | len = rpci->pipelen; |
| 301 | if (filp->private_data) { |
| 302 | struct rpc_pipe_msg *msg; |
| 303 | msg = (struct rpc_pipe_msg *)filp->private_data; |
| 304 | len += msg->len - msg->copied; |
| 305 | } |
| 306 | return put_user(len, (int __user *)arg); |
| 307 | default: |
| 308 | return -EINVAL; |
| 309 | } |
| 310 | } |
| 311 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 312 | static const struct file_operations rpc_pipe_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | .owner = THIS_MODULE, |
| 314 | .llseek = no_llseek, |
| 315 | .read = rpc_pipe_read, |
| 316 | .write = rpc_pipe_write, |
| 317 | .poll = rpc_pipe_poll, |
| 318 | .ioctl = rpc_pipe_ioctl, |
| 319 | .open = rpc_pipe_open, |
| 320 | .release = rpc_pipe_release, |
| 321 | }; |
| 322 | |
| 323 | static int |
| 324 | rpc_show_info(struct seq_file *m, void *v) |
| 325 | { |
| 326 | struct rpc_clnt *clnt = m->private; |
| 327 | |
| 328 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); |
| 329 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, |
| 330 | clnt->cl_prog, clnt->cl_vers); |
Chuck Lever | e7f7865 | 2006-08-22 20:06:19 -0400 | [diff] [blame] | 331 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
| 332 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | static int |
| 337 | rpc_info_open(struct inode *inode, struct file *file) |
| 338 | { |
| 339 | struct rpc_clnt *clnt; |
| 340 | int ret = single_open(file, rpc_show_info, NULL); |
| 341 | |
| 342 | if (!ret) { |
| 343 | struct seq_file *m = file->private_data; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 344 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | clnt = RPC_I(inode)->private; |
| 346 | if (clnt) { |
| 347 | atomic_inc(&clnt->cl_users); |
| 348 | m->private = clnt; |
| 349 | } else { |
| 350 | single_release(inode, file); |
| 351 | ret = -EINVAL; |
| 352 | } |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 353 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
| 355 | return ret; |
| 356 | } |
| 357 | |
| 358 | static int |
| 359 | rpc_info_release(struct inode *inode, struct file *file) |
| 360 | { |
| 361 | struct seq_file *m = file->private_data; |
| 362 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; |
| 363 | |
| 364 | if (clnt) |
| 365 | rpc_release_client(clnt); |
| 366 | return single_release(inode, file); |
| 367 | } |
| 368 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 369 | static const struct file_operations rpc_info_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | .owner = THIS_MODULE, |
| 371 | .open = rpc_info_open, |
| 372 | .read = seq_read, |
| 373 | .llseek = seq_lseek, |
| 374 | .release = rpc_info_release, |
| 375 | }; |
| 376 | |
| 377 | |
| 378 | /* |
| 379 | * We have a single directory with 1 node in it. |
| 380 | */ |
| 381 | enum { |
| 382 | RPCAUTH_Root = 1, |
| 383 | RPCAUTH_lockd, |
| 384 | RPCAUTH_mount, |
| 385 | RPCAUTH_nfs, |
| 386 | RPCAUTH_portmap, |
| 387 | RPCAUTH_statd, |
| 388 | RPCAUTH_RootEOF |
| 389 | }; |
| 390 | |
| 391 | /* |
| 392 | * Description of fs contents. |
| 393 | */ |
| 394 | struct rpc_filelist { |
| 395 | char *name; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 396 | const struct file_operations *i_fop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | int mode; |
| 398 | }; |
| 399 | |
| 400 | static struct rpc_filelist files[] = { |
| 401 | [RPCAUTH_lockd] = { |
| 402 | .name = "lockd", |
| 403 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 404 | }, |
| 405 | [RPCAUTH_mount] = { |
| 406 | .name = "mount", |
| 407 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 408 | }, |
| 409 | [RPCAUTH_nfs] = { |
| 410 | .name = "nfs", |
| 411 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 412 | }, |
| 413 | [RPCAUTH_portmap] = { |
| 414 | .name = "portmap", |
| 415 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 416 | }, |
| 417 | [RPCAUTH_statd] = { |
| 418 | .name = "statd", |
| 419 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 420 | }, |
| 421 | }; |
| 422 | |
| 423 | enum { |
| 424 | RPCAUTH_info = 2, |
| 425 | RPCAUTH_EOF |
| 426 | }; |
| 427 | |
| 428 | static struct rpc_filelist authfiles[] = { |
| 429 | [RPCAUTH_info] = { |
| 430 | .name = "info", |
| 431 | .i_fop = &rpc_info_operations, |
| 432 | .mode = S_IFREG | S_IRUSR, |
| 433 | }, |
| 434 | }; |
| 435 | |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 436 | struct vfsmount *rpc_get_mount(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | { |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 438 | int err; |
| 439 | |
Trond Myklebust | 1f5ce9e | 2006-06-09 09:34:16 -0400 | [diff] [blame] | 440 | 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] | 441 | if (err != 0) |
| 442 | return ERR_PTR(err); |
| 443 | return rpc_mount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | } |
| 445 | |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 446 | void rpc_put_mount(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | { |
| 448 | simple_release_fs(&rpc_mount, &rpc_mount_count); |
| 449 | } |
| 450 | |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 451 | static int |
| 452 | rpc_lookup_parent(char *path, struct nameidata *nd) |
| 453 | { |
| 454 | if (path[0] == '\0') |
| 455 | return -ENOENT; |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 456 | nd->mnt = rpc_get_mount(); |
| 457 | if (IS_ERR(nd->mnt)) { |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 458 | printk(KERN_WARNING "%s: %s failed to mount " |
| 459 | "pseudofilesystem \n", __FILE__, __FUNCTION__); |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 460 | return PTR_ERR(nd->mnt); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 461 | } |
Trond Myklebust | 5428154 | 2006-03-20 13:44:49 -0500 | [diff] [blame] | 462 | mntget(nd->mnt); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 463 | nd->dentry = dget(rpc_mount->mnt_root); |
| 464 | nd->last_type = LAST_ROOT; |
| 465 | nd->flags = LOOKUP_PARENT; |
| 466 | nd->depth = 0; |
| 467 | |
| 468 | if (path_walk(path, nd)) { |
| 469 | printk(KERN_WARNING "%s: %s failed to find path %s\n", |
| 470 | __FILE__, __FUNCTION__, path); |
| 471 | rpc_put_mount(); |
| 472 | return -ENOENT; |
| 473 | } |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | static void |
| 478 | rpc_release_path(struct nameidata *nd) |
| 479 | { |
| 480 | path_release(nd); |
| 481 | rpc_put_mount(); |
| 482 | } |
| 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | static struct inode * |
| 485 | rpc_get_inode(struct super_block *sb, int mode) |
| 486 | { |
| 487 | struct inode *inode = new_inode(sb); |
| 488 | if (!inode) |
| 489 | return NULL; |
| 490 | inode->i_mode = mode; |
| 491 | inode->i_uid = inode->i_gid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | inode->i_blocks = 0; |
| 493 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 494 | switch(mode & S_IFMT) { |
| 495 | case S_IFDIR: |
| 496 | inode->i_fop = &simple_dir_operations; |
| 497 | inode->i_op = &simple_dir_inode_operations; |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 498 | inc_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | default: |
| 500 | break; |
| 501 | } |
| 502 | return inode; |
| 503 | } |
| 504 | |
| 505 | /* |
| 506 | * FIXME: This probably has races. |
| 507 | */ |
| 508 | static void |
| 509 | rpc_depopulate(struct dentry *parent) |
| 510 | { |
| 511 | struct inode *dir = parent->d_inode; |
| 512 | struct list_head *pos, *next; |
| 513 | struct dentry *dentry, *dvec[10]; |
| 514 | int n = 0; |
| 515 | |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 516 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | repeat: |
| 518 | spin_lock(&dcache_lock); |
| 519 | list_for_each_safe(pos, next, &parent->d_subdirs) { |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 520 | dentry = list_entry(pos, struct dentry, d_u.d_child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | spin_lock(&dentry->d_lock); |
| 522 | if (!d_unhashed(dentry)) { |
| 523 | dget_locked(dentry); |
| 524 | __d_drop(dentry); |
| 525 | spin_unlock(&dentry->d_lock); |
| 526 | dvec[n++] = dentry; |
| 527 | if (n == ARRAY_SIZE(dvec)) |
| 528 | break; |
| 529 | } else |
| 530 | spin_unlock(&dentry->d_lock); |
| 531 | } |
| 532 | spin_unlock(&dcache_lock); |
| 533 | if (n) { |
| 534 | do { |
| 535 | dentry = dvec[--n]; |
| 536 | if (dentry->d_inode) { |
| 537 | rpc_close_pipes(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | simple_unlink(dir, dentry); |
| 539 | } |
Trond Myklebust | 68adb0a | 2006-08-10 17:51:46 -0400 | [diff] [blame] | 540 | inode_dir_notify(dir, DN_DELETE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | dput(dentry); |
| 542 | } while (n); |
| 543 | goto repeat; |
| 544 | } |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 545 | mutex_unlock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | static int |
| 549 | rpc_populate(struct dentry *parent, |
| 550 | struct rpc_filelist *files, |
| 551 | int start, int eof) |
| 552 | { |
| 553 | struct inode *inode, *dir = parent->d_inode; |
| 554 | void *private = RPC_I(dir)->private; |
| 555 | struct dentry *dentry; |
| 556 | int mode, i; |
| 557 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 558 | mutex_lock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | for (i = start; i < eof; i++) { |
| 560 | dentry = d_alloc_name(parent, files[i].name); |
| 561 | if (!dentry) |
| 562 | goto out_bad; |
| 563 | mode = files[i].mode; |
| 564 | inode = rpc_get_inode(dir->i_sb, mode); |
| 565 | if (!inode) { |
| 566 | dput(dentry); |
| 567 | goto out_bad; |
| 568 | } |
| 569 | inode->i_ino = i; |
| 570 | if (files[i].i_fop) |
| 571 | inode->i_fop = files[i].i_fop; |
| 572 | if (private) |
| 573 | rpc_inode_setowner(inode, private); |
| 574 | if (S_ISDIR(mode)) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 575 | inc_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | d_add(dentry, inode); |
| 577 | } |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 578 | mutex_unlock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | return 0; |
| 580 | out_bad: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 581 | mutex_unlock(&dir->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
| 583 | __FILE__, __FUNCTION__, parent->d_name.name); |
| 584 | return -ENOMEM; |
| 585 | } |
| 586 | |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 587 | static int |
| 588 | __rpc_mkdir(struct inode *dir, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
| 590 | struct inode *inode; |
| 591 | |
Trond Myklebust | 1d21632 | 2007-02-02 15:56:06 -0800 | [diff] [blame] | 592 | inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | if (!inode) |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 594 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | inode->i_ino = iunique(dir->i_sb, 100); |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 596 | d_instantiate(dentry, inode); |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 597 | inc_nlink(dir); |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 598 | inode_dir_notify(dir, DN_CREATE); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 599 | return 0; |
| 600 | out_err: |
| 601 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", |
| 602 | __FILE__, __FUNCTION__, dentry->d_name.name); |
| 603 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
| 605 | |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 606 | static int |
| 607 | __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | { |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 609 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 611 | shrink_dcache_parent(dentry); |
Trond Myklebust | 68adb0a | 2006-08-10 17:51:46 -0400 | [diff] [blame] | 612 | if (d_unhashed(dentry)) |
| 613 | return 0; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 614 | if ((error = simple_rmdir(dir, dentry)) != 0) |
| 615 | return error; |
| 616 | if (!error) { |
| 617 | inode_dir_notify(dir, DN_DELETE); |
| 618 | d_drop(dentry); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 619 | } |
| 620 | return 0; |
| 621 | } |
Christoph Hellwig | 278c995 | 2005-07-24 23:53:01 +0100 | [diff] [blame] | 622 | |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 623 | static struct dentry * |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 624 | rpc_lookup_create(struct dentry *parent, const char *name, int len) |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 625 | { |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 626 | struct inode *dir = parent->d_inode; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 627 | struct dentry *dentry; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 628 | |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 629 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 630 | dentry = lookup_one_len(name, parent, len); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 631 | if (IS_ERR(dentry)) |
| 632 | goto out_err; |
| 633 | if (dentry->d_inode) { |
| 634 | dput(dentry); |
| 635 | dentry = ERR_PTR(-EEXIST); |
| 636 | goto out_err; |
| 637 | } |
| 638 | return dentry; |
| 639 | out_err: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 640 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 641 | return dentry; |
| 642 | } |
| 643 | |
| 644 | static struct dentry * |
| 645 | rpc_lookup_negative(char *path, struct nameidata *nd) |
| 646 | { |
| 647 | struct dentry *dentry; |
| 648 | int error; |
| 649 | |
| 650 | if ((error = rpc_lookup_parent(path, nd)) != 0) |
| 651 | return ERR_PTR(error); |
| 652 | dentry = rpc_lookup_create(nd->dentry, nd->last.name, nd->last.len); |
| 653 | if (IS_ERR(dentry)) |
| 654 | rpc_release_path(nd); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 655 | return dentry; |
| 656 | } |
| 657 | |
| 658 | |
| 659 | struct dentry * |
| 660 | rpc_mkdir(char *path, struct rpc_clnt *rpc_client) |
| 661 | { |
| 662 | struct nameidata nd; |
| 663 | struct dentry *dentry; |
| 664 | struct inode *dir; |
| 665 | int error; |
| 666 | |
| 667 | dentry = rpc_lookup_negative(path, &nd); |
| 668 | if (IS_ERR(dentry)) |
| 669 | return dentry; |
| 670 | dir = nd.dentry->d_inode; |
| 671 | if ((error = __rpc_mkdir(dir, dentry)) != 0) |
| 672 | goto err_dput; |
| 673 | RPC_I(dentry->d_inode)->private = rpc_client; |
| 674 | error = rpc_populate(dentry, authfiles, |
| 675 | RPCAUTH_info, RPCAUTH_EOF); |
| 676 | if (error) |
| 677 | goto err_depopulate; |
Trond Myklebust | 5c3e985 | 2006-07-29 17:37:40 -0400 | [diff] [blame] | 678 | dget(dentry); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 679 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 680 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 681 | rpc_release_path(&nd); |
Trond Myklebust | 5c3e985 | 2006-07-29 17:37:40 -0400 | [diff] [blame] | 682 | return dentry; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 683 | err_depopulate: |
| 684 | rpc_depopulate(dentry); |
| 685 | __rpc_rmdir(dir, dentry); |
| 686 | err_dput: |
| 687 | dput(dentry); |
| 688 | printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", |
| 689 | __FILE__, __FUNCTION__, path, error); |
| 690 | dentry = ERR_PTR(error); |
| 691 | goto out; |
| 692 | } |
| 693 | |
| 694 | int |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 695 | rpc_rmdir(struct dentry *dentry) |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 696 | { |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 697 | struct dentry *parent; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 698 | struct inode *dir; |
| 699 | int error; |
| 700 | |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 701 | parent = dget_parent(dentry); |
| 702 | dir = parent->d_inode; |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 703 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 704 | rpc_depopulate(dentry); |
| 705 | error = __rpc_rmdir(dir, dentry); |
| 706 | dput(dentry); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 707 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | dff02cc | 2006-07-31 14:17:18 -0700 | [diff] [blame] | 708 | dput(parent); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 709 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | } |
| 711 | |
| 712 | struct dentry * |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 713 | rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct rpc_pipe_ops *ops, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | struct dentry *dentry; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 716 | struct inode *dir, *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | struct rpc_inode *rpci; |
| 718 | |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 719 | dentry = rpc_lookup_create(parent, name, strlen(name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | if (IS_ERR(dentry)) |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 721 | return dentry; |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 722 | dir = parent->d_inode; |
Steve Dickson | a53a3c5 | 2006-09-06 11:51:21 -0400 | [diff] [blame] | 723 | inode = rpc_get_inode(dir->i_sb, S_IFIFO | S_IRUSR | S_IWUSR); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 724 | if (!inode) |
| 725 | goto err_dput; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | inode->i_ino = iunique(dir->i_sb, 100); |
| 727 | inode->i_fop = &rpc_pipe_fops; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 728 | d_instantiate(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | rpci = RPC_I(inode); |
| 730 | rpci->private = private; |
| 731 | rpci->flags = flags; |
| 732 | rpci->ops = ops; |
| 733 | inode_dir_notify(dir, DN_CREATE); |
Trond Myklebust | 5c3e985 | 2006-07-29 17:37:40 -0400 | [diff] [blame] | 734 | dget(dentry); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 735 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 736 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | 5c3e985 | 2006-07-29 17:37:40 -0400 | [diff] [blame] | 737 | return dentry; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 738 | err_dput: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | dput(dentry); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 740 | dentry = ERR_PTR(-ENOMEM); |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 741 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
| 742 | __FILE__, __FUNCTION__, parent->d_name.name, name, |
| 743 | -ENOMEM); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 744 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | } |
| 746 | |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 747 | int |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 748 | rpc_unlink(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | { |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 750 | struct dentry *parent; |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 751 | struct inode *dir; |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 752 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 754 | parent = dget_parent(dentry); |
| 755 | dir = parent->d_inode; |
Arjan van de Ven | c6573c2 | 2006-07-03 00:25:16 -0700 | [diff] [blame] | 756 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
Trond Myklebust | 68adb0a | 2006-08-10 17:51:46 -0400 | [diff] [blame] | 757 | if (!d_unhashed(dentry)) { |
| 758 | d_drop(dentry); |
| 759 | if (dentry->d_inode) { |
| 760 | rpc_close_pipes(dentry->d_inode); |
| 761 | error = simple_unlink(dir, dentry); |
| 762 | } |
| 763 | inode_dir_notify(dir, DN_DELETE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 765 | dput(dentry); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 766 | mutex_unlock(&dir->i_mutex); |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 767 | dput(parent); |
Trond Myklebust | f134585 | 2005-09-23 11:08:25 -0400 | [diff] [blame] | 768 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | /* |
| 772 | * populate the filesystem |
| 773 | */ |
| 774 | static struct super_operations s_ops = { |
| 775 | .alloc_inode = rpc_alloc_inode, |
| 776 | .destroy_inode = rpc_destroy_inode, |
| 777 | .statfs = simple_statfs, |
| 778 | }; |
| 779 | |
| 780 | #define RPCAUTH_GSSMAGIC 0x67596969 |
| 781 | |
| 782 | static int |
| 783 | rpc_fill_super(struct super_block *sb, void *data, int silent) |
| 784 | { |
| 785 | struct inode *inode; |
| 786 | struct dentry *root; |
| 787 | |
| 788 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 789 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 790 | sb->s_magic = RPCAUTH_GSSMAGIC; |
| 791 | sb->s_op = &s_ops; |
| 792 | sb->s_time_gran = 1; |
| 793 | |
| 794 | inode = rpc_get_inode(sb, S_IFDIR | 0755); |
| 795 | if (!inode) |
| 796 | return -ENOMEM; |
| 797 | root = d_alloc_root(inode); |
| 798 | if (!root) { |
| 799 | iput(inode); |
| 800 | return -ENOMEM; |
| 801 | } |
| 802 | if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) |
| 803 | goto out; |
| 804 | sb->s_root = root; |
| 805 | return 0; |
| 806 | out: |
| 807 | d_genocide(root); |
| 808 | dput(root); |
| 809 | return -ENOMEM; |
| 810 | } |
| 811 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 812 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | rpc_get_sb(struct file_system_type *fs_type, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 814 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 816 | return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
| 818 | |
| 819 | static struct file_system_type rpc_pipe_fs_type = { |
| 820 | .owner = THIS_MODULE, |
| 821 | .name = "rpc_pipefs", |
| 822 | .get_sb = rpc_get_sb, |
| 823 | .kill_sb = kill_litter_super, |
| 824 | }; |
| 825 | |
| 826 | static void |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 827 | init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | { |
| 829 | struct rpc_inode *rpci = (struct rpc_inode *) foo; |
| 830 | |
Christoph Lameter | 50953fe | 2007-05-06 14:50:16 -0700 | [diff] [blame] | 831 | if (flags & SLAB_CTOR_CONSTRUCTOR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | inode_init_once(&rpci->vfs_inode); |
| 833 | rpci->private = NULL; |
| 834 | rpci->nreaders = 0; |
| 835 | rpci->nwriters = 0; |
| 836 | INIT_LIST_HEAD(&rpci->in_upcall); |
| 837 | INIT_LIST_HEAD(&rpci->pipe); |
| 838 | rpci->pipelen = 0; |
| 839 | init_waitqueue_head(&rpci->waitq); |
David Howells | 52bad64 | 2006-11-22 14:54:01 +0000 | [diff] [blame] | 840 | INIT_DELAYED_WORK(&rpci->queue_timeout, |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 841 | rpc_timeout_upcall_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | rpci->ops = NULL; |
| 843 | } |
| 844 | } |
| 845 | |
| 846 | int register_rpc_pipefs(void) |
| 847 | { |
Akinobu Mita | 5bd5f58 | 2007-05-09 02:34:51 -0700 | [diff] [blame] | 848 | int err; |
| 849 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 851 | sizeof(struct rpc_inode), |
| 852 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
| 853 | SLAB_MEM_SPREAD), |
| 854 | init_once, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | if (!rpc_inode_cachep) |
| 856 | return -ENOMEM; |
Akinobu Mita | 5bd5f58 | 2007-05-09 02:34:51 -0700 | [diff] [blame] | 857 | err = register_filesystem(&rpc_pipe_fs_type); |
| 858 | if (err) { |
| 859 | kmem_cache_destroy(rpc_inode_cachep); |
| 860 | return err; |
| 861 | } |
| 862 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | return 0; |
| 864 | } |
| 865 | |
| 866 | void unregister_rpc_pipefs(void) |
| 867 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 868 | kmem_cache_destroy(rpc_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | unregister_filesystem(&rpc_pipe_fs_type); |
| 870 | } |