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Commit d2f3a7f9 authored by Jeff Layton's avatar Jeff Layton Committed by Anna Schumaker
Browse files

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: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent 1ea67dbd

fs/nfs/nfs4proc.c

+22 −27
Original line number Diff line number Diff line
@@ -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)