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/*

 * linux/fs/nfs/callback_proc.c

 *

 * Copyright (C) 2004 Trond Myklebust

 *

 * NFSv4 callback procedures

 */

#include <linux/nfs4.h>

#include <linux/nfs_fs.h>

#include "nfs4_fs.h"

#include "callback.h"

#include "delegation.h"

#include "internal.h"

#define NFSDBG_FACILITY NFSDBG_CALLBACK

__be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)

{

        struct nfs_client *clp;

        struct nfs_delegation *delegation;

        struct nfs_inode *nfsi;

        struct inode *inode;

        res->bitmap[0] = res->bitmap[1] = 0;

        res->status = htonl(NFS4ERR_BADHANDLE);

        clp = nfs_find_client(args->addr, 4);

        if (clp == NULL)

                goto out;

        inode = nfs_delegation_find_inode(clp, &args->fh);

        if (inode == NULL)

                goto out_putclient;

        nfsi = NFS_I(inode);

        down_read(&nfsi->rwsem);

        delegation = nfsi->delegation;

        if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)

                goto out_iput;

        res->size = i_size_read(inode);

        res->change_attr = delegation->change_attr;

        if (nfsi->npages != 0)

                res->change_attr++;

        res->ctime = inode->i_ctime;

        res->mtime = inode->i_mtime;

        res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &

                args->bitmap[0];

        res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &

                args->bitmap[1];

        res->status = 0;

out_iput:

        up_read(&nfsi->rwsem);

        iput(inode);

out_putclient:

        nfs_put_client(clp);

out:

        dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));

        return res->status;

}

__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)

{

        struct nfs_client *clp;

        struct inode *inode;

        __be32 res;

        res = htonl(NFS4ERR_BADHANDLE);

        clp = nfs_find_client(args->addr, 4);

        if (clp == NULL)

                goto out;

        inode = nfs_delegation_find_inode(clp, &args->fh);

        if (inode == NULL)

                goto out_putclient;

        /* Set up a helper thread to actually return the delegation */

        switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {

                case 0:

                        res = 0;

                        break;

                case -ENOENT:

                        res = htonl(NFS4ERR_BAD_STATEID);

                        break;

                default:

                        res = htonl(NFS4ERR_RESOURCE);

        }

        iput(inode);

out_putclient:

        nfs_put_client(clp);

out:

        dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));

        return res;

}