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authorArnd Bergmann <arnd@arndb.de>2010-10-04 23:18:23 +0400
committerArnd Bergmann <arnd@arndb.de>2010-10-19 13:29:59 +0400
commita6f8dbc654c3dddc5ac98cf59a88447a90e99ece (patch)
treeef4244528cd4a975bca2d00ac1b5e5430a1eac45 /net/sunrpc/rpc_pipe.c
parent1fa4f3b57cf0c525027ea61011312de139b04f9b (diff)
downloadlinux-a6f8dbc654c3dddc5ac98cf59a88447a90e99ece.tar.xz
sunrpc: remove the big kernel lock
The sunrpc cache_ioctl function does not need the big kernel lock because it uses its own queue_lock already. rpc_pipe_ioctl apparently should be using i_lock like the other operations on the pipe file descriptor do. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'net/sunrpc/rpc_pipe.c')
-rw-r--r--net/sunrpc/rpc_pipe.c26
1 files changed, 9 insertions, 17 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 95ccbcf45d3e..1e97d8610291 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -27,7 +27,6 @@
#include <linux/workqueue.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/sunrpc/cache.h>
-#include <linux/smp_lock.h>
static struct vfsmount *rpc_mount __read_mostly;
static int rpc_mount_count;
@@ -309,40 +308,33 @@ rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
return mask;
}
-static int
-rpc_pipe_ioctl_unlocked(struct file *filp, unsigned int cmd, unsigned long arg)
+static long
+rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
- struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct rpc_inode *rpci = RPC_I(inode);
int len;
switch (cmd) {
case FIONREAD:
- if (rpci->ops == NULL)
+ spin_lock(&inode->i_lock);
+ if (rpci->ops == NULL) {
+ spin_unlock(&inode->i_lock);
return -EPIPE;
+ }
len = rpci->pipelen;
if (filp->private_data) {
struct rpc_pipe_msg *msg;
msg = (struct rpc_pipe_msg *)filp->private_data;
len += msg->len - msg->copied;
}
+ spin_unlock(&inode->i_lock);
return put_user(len, (int __user *)arg);
default:
return -EINVAL;
}
}
-static long
-rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
- long ret;
-
- lock_kernel();
- ret = rpc_pipe_ioctl_unlocked(filp, cmd, arg);
- unlock_kernel();
-
- return ret;
-}
-
static const struct file_operations rpc_pipe_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,