2005-04-16 16:20:36 -06:00
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/*
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* linux/fs/nfs/unlink.c
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*
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* nfs sillydelete handling
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*
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* NOTE: we rely on holding the BKL for list manipulation protection.
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*/
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/dcache.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfs_fs.h>
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struct nfs_unlinkdata {
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struct nfs_unlinkdata *next;
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struct dentry *dir, *dentry;
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struct qstr name;
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struct rpc_task task;
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struct rpc_cred *cred;
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unsigned int count;
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};
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static struct nfs_unlinkdata *nfs_deletes;
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static RPC_WAITQ(nfs_delete_queue, "nfs_delete_queue");
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/**
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* nfs_detach_unlinkdata - Remove asynchronous unlink from global list
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* @data: pointer to descriptor
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*/
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static inline void
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nfs_detach_unlinkdata(struct nfs_unlinkdata *data)
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{
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struct nfs_unlinkdata **q;
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for (q = &nfs_deletes; *q != NULL; q = &((*q)->next)) {
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if (*q == data) {
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*q = data->next;
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break;
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}
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}
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}
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/**
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* nfs_put_unlinkdata - release data from a sillydelete operation.
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* @data: pointer to unlink structure.
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*/
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static void
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nfs_put_unlinkdata(struct nfs_unlinkdata *data)
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{
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if (--data->count == 0) {
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nfs_detach_unlinkdata(data);
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2005-11-07 02:01:34 -07:00
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kfree(data->name.name);
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2005-04-16 16:20:36 -06:00
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kfree(data);
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}
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}
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#define NAME_ALLOC_LEN(len) ((len+16) & ~15)
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/**
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* nfs_copy_dname - copy dentry name to data structure
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* @dentry: pointer to dentry
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* @data: nfs_unlinkdata
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*/
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static inline void
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nfs_copy_dname(struct dentry *dentry, struct nfs_unlinkdata *data)
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{
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char *str;
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int len = dentry->d_name.len;
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str = kmalloc(NAME_ALLOC_LEN(len), GFP_KERNEL);
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if (!str)
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return;
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memcpy(str, dentry->d_name.name, len);
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if (!data->name.len) {
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data->name.len = len;
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data->name.name = str;
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} else
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kfree(str);
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}
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/**
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* nfs_async_unlink_init - Initialize the RPC info
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* @task: rpc_task of the sillydelete
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*
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* We delay initializing RPC info until after the call to dentry_iput()
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* in order to minimize races against rename().
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*/
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static void
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nfs_async_unlink_init(struct rpc_task *task)
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{
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struct nfs_unlinkdata *data = (struct nfs_unlinkdata *)task->tk_calldata;
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struct dentry *dir = data->dir;
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struct rpc_message msg = {
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.rpc_cred = data->cred,
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};
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int status = -ENOENT;
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if (!data->name.len)
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goto out_err;
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status = NFS_PROTO(dir->d_inode)->unlink_setup(&msg, dir, &data->name);
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if (status < 0)
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goto out_err;
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nfs_begin_data_update(dir->d_inode);
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rpc_call_setup(task, &msg, 0);
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return;
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out_err:
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rpc_exit(task, status);
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}
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/**
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* nfs_async_unlink_done - Sillydelete post-processing
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* @task: rpc_task of the sillydelete
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*
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* Do the directory attribute update.
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*/
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2006-01-03 01:55:04 -07:00
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static void nfs_async_unlink_done(struct rpc_task *task, void *calldata)
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2005-04-16 16:20:36 -06:00
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{
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2006-01-03 01:55:04 -07:00
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struct nfs_unlinkdata *data = calldata;
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2005-04-16 16:20:36 -06:00
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struct dentry *dir = data->dir;
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struct inode *dir_i;
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if (!dir)
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return;
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dir_i = dir->d_inode;
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nfs_end_data_update(dir_i);
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if (NFS_PROTO(dir_i)->unlink_done(dir, task))
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return;
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put_rpccred(data->cred);
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data->cred = NULL;
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dput(dir);
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}
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/**
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* nfs_async_unlink_release - Release the sillydelete data.
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* @task: rpc_task of the sillydelete
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*
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* We need to call nfs_put_unlinkdata as a 'tk_release' task since the
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* rpc_task would be freed too.
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*/
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2006-01-03 01:55:04 -07:00
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static void nfs_async_unlink_release(void *calldata)
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2005-04-16 16:20:36 -06:00
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{
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2006-01-03 01:55:04 -07:00
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struct nfs_unlinkdata *data = calldata;
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2005-04-16 16:20:36 -06:00
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nfs_put_unlinkdata(data);
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}
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2006-01-03 01:55:04 -07:00
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static const struct rpc_call_ops nfs_unlink_ops = {
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.rpc_call_done = nfs_async_unlink_done,
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.rpc_release = nfs_async_unlink_release,
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};
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2005-04-16 16:20:36 -06:00
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/**
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* nfs_async_unlink - asynchronous unlinking of a file
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* @dentry: dentry to unlink
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*/
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int
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nfs_async_unlink(struct dentry *dentry)
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{
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struct dentry *dir = dentry->d_parent;
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struct nfs_unlinkdata *data;
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struct rpc_task *task;
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struct rpc_clnt *clnt = NFS_CLIENT(dir->d_inode);
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int status = -ENOMEM;
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data = kmalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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goto out;
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memset(data, 0, sizeof(*data));
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data->cred = rpcauth_lookupcred(clnt->cl_auth, 0);
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if (IS_ERR(data->cred)) {
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status = PTR_ERR(data->cred);
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goto out_free;
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}
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data->dir = dget(dir);
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data->dentry = dentry;
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data->next = nfs_deletes;
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nfs_deletes = data;
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data->count = 1;
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task = &data->task;
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2006-01-03 01:55:04 -07:00
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rpc_init_task(task, clnt, RPC_TASK_ASYNC, &nfs_unlink_ops, data);
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2005-04-16 16:20:36 -06:00
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task->tk_action = nfs_async_unlink_init;
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spin_lock(&dentry->d_lock);
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dentry->d_flags |= DCACHE_NFSFS_RENAMED;
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spin_unlock(&dentry->d_lock);
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rpc_sleep_on(&nfs_delete_queue, task, NULL, NULL);
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status = 0;
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out:
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return status;
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out_free:
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kfree(data);
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return status;
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}
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/**
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* nfs_complete_unlink - Initialize completion of the sillydelete
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* @dentry: dentry to delete
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*
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* Since we're most likely to be called by dentry_iput(), we
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* only use the dentry to find the sillydelete. We then copy the name
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* into the qstr.
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*/
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void
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nfs_complete_unlink(struct dentry *dentry)
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{
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struct nfs_unlinkdata *data;
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for(data = nfs_deletes; data != NULL; data = data->next) {
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if (dentry == data->dentry)
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break;
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}
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if (!data)
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return;
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data->count++;
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nfs_copy_dname(dentry, data);
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spin_lock(&dentry->d_lock);
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dentry->d_flags &= ~DCACHE_NFSFS_RENAMED;
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spin_unlock(&dentry->d_lock);
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rpc_wake_up_task(&data->task);
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nfs_put_unlinkdata(data);
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}
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