nfs: move nfs4 lock retry attempt loop to a separate function

This also consolidates the waiting logic into a single function,
instead of having it spread across two like it is now.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 22 insertions, 27 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ffadf6be3668..a74c4167b5b0 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5530,22 +5530,6 @@ int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4
         return err;
 }
 
-#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
-#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
-
-/* 
- * sleep, with exponential backoff, and retry the LOCK operation. 
- */
-static unsigned long
-nfs4_set_lock_task_retry(unsigned long timeout)
-{
-        freezable_schedule_timeout_interruptible(timeout);
-        timeout <<= 1;
-        if (timeout > NFS4_LOCK_MAXTIMEOUT)
-                return NFS4_LOCK_MAXTIMEOUT;
-        return timeout;
-}
-
 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
 {
         struct inode *inode = state->inode;
@@ -6178,12 +6162,32 @@ static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *
         return err;
 }
 
+#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
+#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
+
+static int
+nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+        int             status = -ERESTARTSYS;
+        unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
+
+        while(!signalled()) {
+                status = nfs4_proc_setlk(state, cmd, request);
+                if ((status != -EAGAIN) || IS_SETLK(cmd))
+                        break;
+                freezable_schedule_timeout_interruptible(timeout);
+                timeout *= 2;
+                timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
+                status = -ERESTARTSYS;
+        }
+        return status;
+}
+
 static int
 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
 {
         struct nfs_open_context *ctx;
         struct nfs4_state *state;
-        unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
         int status;
 
         /* verify open state */
@@ -6233,16 +6237,7 @@ nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
         if (status != 0)
                 return status;
 
-        do {
-                status = nfs4_proc_setlk(state, cmd, request);
-                if ((status != -EAGAIN) || IS_SETLK(cmd))
-                        break;
-                timeout = nfs4_set_lock_task_retry(timeout);
-                status = -ERESTARTSYS;
-                if (signalled())
-                        break;
-        } while(status < 0);
-        return status;
+        return nfs4_retry_setlk(state, cmd, request);
 }
 
 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)