2 * linux/fs/nfs/unlink.c
4 * nfs sillydelete handling
6 * NOTE: we rely on holding the BKL for list manipulation protection.
9 #include <linux/slab.h>
10 #include <linux/string.h>
11 #include <linux/dcache.h>
12 #include <linux/sunrpc/sched.h>
13 #include <linux/sunrpc/clnt.h>
14 #include <linux/nfs_fs.h>
17 struct nfs_unlinkdata {
18 struct nfs_unlinkdata *next;
19 struct dentry *dir, *dentry;
22 struct rpc_cred *cred;
26 static struct nfs_unlinkdata *nfs_deletes;
27 static RPC_WAITQ(nfs_delete_queue, "nfs_delete_queue");
30 * nfs_detach_unlinkdata - Remove asynchronous unlink from global list
31 * @data: pointer to descriptor
34 nfs_detach_unlinkdata(struct nfs_unlinkdata *data)
36 struct nfs_unlinkdata **q;
38 for (q = &nfs_deletes; *q != NULL; q = &((*q)->next)) {
47 * nfs_put_unlinkdata - release data from a sillydelete operation.
48 * @data: pointer to unlink structure.
51 nfs_put_unlinkdata(struct nfs_unlinkdata *data)
53 if (--data->count == 0) {
54 nfs_detach_unlinkdata(data);
55 if (data->name.name != NULL)
56 kfree(data->name.name);
61 #define NAME_ALLOC_LEN(len) ((len+16) & ~15)
63 * nfs_copy_dname - copy dentry name to data structure
64 * @dentry: pointer to dentry
65 * @data: nfs_unlinkdata
68 nfs_copy_dname(struct dentry *dentry, struct nfs_unlinkdata *data)
71 int len = dentry->d_name.len;
73 str = kmalloc(NAME_ALLOC_LEN(len), GFP_KERNEL);
76 memcpy(str, dentry->d_name.name, len);
77 if (!data->name.len) {
79 data->name.name = str;
85 * nfs_async_unlink_init - Initialize the RPC info
86 * @task: rpc_task of the sillydelete
88 * We delay initializing RPC info until after the call to dentry_iput()
89 * in order to minimize races against rename().
92 nfs_async_unlink_init(struct rpc_task *task)
94 struct nfs_unlinkdata *data = (struct nfs_unlinkdata *)task->tk_calldata;
95 struct dentry *dir = data->dir;
96 struct rpc_message msg;
102 memset(&msg, 0, sizeof(msg));
103 msg.rpc_cred = data->cred;
104 status = NFS_PROTO(dir->d_inode)->unlink_setup(&msg, dir, &data->name);
107 rpc_call_setup(task, &msg, 0);
110 rpc_exit(task, status);
114 * nfs_async_unlink_done - Sillydelete post-processing
115 * @task: rpc_task of the sillydelete
117 * Do the directory attribute update.
120 nfs_async_unlink_done(struct rpc_task *task)
122 struct nfs_unlinkdata *data = (struct nfs_unlinkdata *)task->tk_calldata;
123 struct dentry *dir = data->dir;
126 if (nfs_async_handle_jukebox(task))
130 dir_i = dir->d_inode;
131 nfs_zap_caches(dir_i);
132 NFS_PROTO(dir_i)->unlink_done(dir, &task->tk_msg);
133 put_rpccred(data->cred);
139 * nfs_async_unlink_release - Release the sillydelete data.
140 * @task: rpc_task of the sillydelete
142 * We need to call nfs_put_unlinkdata as a 'tk_release' task since the
143 * rpc_task would be freed too.
146 nfs_async_unlink_release(struct rpc_task *task)
148 struct nfs_unlinkdata *data = (struct nfs_unlinkdata *)task->tk_calldata;
149 nfs_put_unlinkdata(data);
153 * nfs_async_unlink - asynchronous unlinking of a file
154 * @dir: directory in which the file resides.
155 * @name: name of the file to unlink.
158 nfs_async_unlink(struct dentry *dentry)
160 struct dentry *dir = dentry->d_parent;
161 struct nfs_unlinkdata *data;
162 struct rpc_task *task;
163 struct rpc_clnt *clnt = NFS_CLIENT(dir->d_inode);
164 int status = -ENOMEM;
166 data = kmalloc(sizeof(*data), GFP_KERNEL);
169 memset(data, 0, sizeof(*data));
171 data->dir = dget(dir);
172 data->dentry = dentry;
174 data->next = nfs_deletes;
179 rpc_init_task(task, clnt, nfs_async_unlink_done , RPC_TASK_ASYNC);
180 task->tk_calldata = data;
181 task->tk_action = nfs_async_unlink_init;
182 task->tk_release = nfs_async_unlink_release;
184 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
185 data->cred = rpcauth_lookupcred(clnt->cl_auth, 0);
187 rpc_sleep_on(&nfs_delete_queue, task, NULL, NULL);
194 * nfs_complete_remove - Initialize completion of the sillydelete
195 * @dentry: dentry to delete
197 * Since we're most likely to be called by dentry_iput(), we
198 * only use the dentry to find the sillydelete. We then copy the name
202 nfs_complete_unlink(struct dentry *dentry)
204 struct nfs_unlinkdata *data;
206 for(data = nfs_deletes; data != NULL; data = data->next) {
207 if (dentry == data->dentry)
213 nfs_copy_dname(dentry, data);
214 dentry->d_flags &= ~DCACHE_NFSFS_RENAMED;
215 if (data->task.tk_rpcwait == &nfs_delete_queue)
216 rpc_wake_up_task(&data->task);
217 nfs_put_unlinkdata(data);