X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=fs%2Fnfsd%2Fnfsctl.c;h=161afdcb8f7d911b81035e3a76f20a5aad05635e;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=9c9399258afd06bf7ef26ac036a1c1014793dbe5;hpb=a2c21200f1c81b08cb55e417b68150bba439b646;p=linux-2.6.git

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 9c9399258..161afdcb8 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -80,101 +80,31 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 	[NFSD_Leasetime] = write_leasetime,
 };
 
-/* an argresp is stored in an allocated page and holds the 
- * size of the argument or response, along with its content
- */
-struct argresp {
-	ssize_t size;
-	char data[0];
-};
-
-/*
- * transaction based IO methods.
- * The file expects a single write which triggers the transaction, and then
- * possibly a read which collects the result - which is stored in a 
- * file-local buffer.
- */
-static ssize_t TA_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
+static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 {
 	ino_t ino =  file->f_dentry->d_inode->i_ino;
-	struct argresp *ar;
-	ssize_t rv = 0;
+	char *data;
+	ssize_t rv;
 
 	if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino])
 		return -EINVAL;
-	if (file->private_data) 
-		return -EINVAL; /* only one write allowed per open */
-	if (size > PAGE_SIZE - sizeof(struct argresp))
-		return -EFBIG;
 
-	ar = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	if (!ar)
-		return -ENOMEM;
-	ar->size = 0;
-	down(&file->f_dentry->d_inode->i_sem);
-	if (file->private_data)
-		rv = -EINVAL;
-	else
-		file->private_data = ar;
-	up(&file->f_dentry->d_inode->i_sem);
-	if (rv) {
-		kfree(ar);
-		return rv;
-	}
-	if (copy_from_user(ar->data, buf, size))
-		return -EFAULT;
-	
-	rv =  write_op[ino](file, ar->data, size);
+	data = simple_transaction_get(file, buf, size);
+	if (IS_ERR(data))
+		return PTR_ERR(data);
+
+	rv =  write_op[ino](file, data, size);
 	if (rv>0) {
-		ar->size = rv;
+		simple_transaction_set(file, rv);
 		rv = size;
 	}
 	return rv;
 }
 
-
-static ssize_t TA_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
-{
-	struct argresp *ar;
-	ssize_t rv = 0;
-	
-	if (file->private_data == NULL)
-		rv = TA_write(file, buf, 0, pos);
-	if (rv < 0)
-		return rv;
-
-	ar = file->private_data;
-	if (!ar)
-		return 0;
-	if (*pos >= ar->size)
-		return 0;
-	if (*pos + size > ar->size)
-		size = ar->size - *pos;
-	if (copy_to_user(buf, ar->data + *pos, size))
-		return -EFAULT;
-	*pos += size;
-	return size;
-}
-
-static int TA_open(struct inode *inode, struct file *file)
-{
-	file->private_data = NULL;
-	return 0;
-}
-
-static int TA_release(struct inode *inode, struct file *file)
-{
-	void *p = file->private_data;
-	file->private_data = NULL;
-	kfree(p);
-	return 0;
-}
-
 static struct file_operations transaction_ops = {
-	.write		= TA_write,
-	.read		= TA_read,
-	.open		= TA_open,
-	.release	= TA_release,
+	.write		= nfsctl_transaction_write,
+	.read		= simple_transaction_read,
+	.release	= simple_transaction_release,
 };
 
 extern struct seq_operations nfs_exports_op;
@@ -366,7 +296,7 @@ static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 	if (len)
 		return len;
 	
-	mesg = buf; len = PAGE_SIZE-sizeof(struct argresp);
+	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 	mesg[-1] = '\n';
 	return mesg - buf;