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Commit 15bb3afe authored by Peng Tao's avatar Peng Tao Committed by Trond Myklebust
Browse files

nfs4: add nfs4_check_delegation 



Signed-off-by: default avatarPeng Tao <tao.peng@primarydata.com>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 0b0bc6ea

fs/nfs/delegation.c

+25 −9
Original line number Diff line number Diff line
@@ -41,14 +41,8 @@ void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) 
	set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags);

}



/**

 * nfs_have_delegation - check if inode has a delegation

 * @inode: inode to check

 * @flags: delegation types to check for

 *

 * Returns one if inode has the indicated delegation, otherwise zero.

 */

int nfs4_have_delegation(struct inode *inode, fmode_t flags)

static int

nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark)

{

	struct nfs_delegation *delegation;

	int ret = 0;
@@ -58,12 +52,34 @@ int nfs4_have_delegation(struct inode *inode, fmode_t flags) 
	delegation = rcu_dereference(NFS_I(inode)->delegation);

	if (delegation != NULL && (delegation->type & flags) == flags &&

	    !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) {

		if (mark)

			nfs_mark_delegation_referenced(delegation);

		ret = 1;

	}

	rcu_read_unlock();

	return ret;

}

/**

 * nfs_have_delegation - check if inode has a delegation, mark it

 * NFS_DELEGATION_REFERENCED if there is one.

 * @inode: inode to check

 * @flags: delegation types to check for

 *

 * Returns one if inode has the indicated delegation, otherwise zero.

 */

int nfs4_have_delegation(struct inode *inode, fmode_t flags)

{

	return nfs4_do_check_delegation(inode, flags, true);

}



/*

 * nfs4_check_delegation - check if inode has a delegation, do not mark

 * NFS_DELEGATION_REFERENCED if it has one.

 */

int nfs4_check_delegation(struct inode *inode, fmode_t flags)

{

	return nfs4_do_check_delegation(inode, flags, false);

}



static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)

{

fs/nfs/delegation.h

+1 −0
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, fmode_ 


void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);

int nfs4_have_delegation(struct inode *inode, fmode_t flags);

int nfs4_check_delegation(struct inode *inode, fmode_t flags);



#endif