root/fs/nfs/callback_proc.c

DEFINITIONS

1. nfs4_callback_getattr
2. nfs4_callback_recall

/*
 * 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"

#ifdef NFS_DEBUG
#define NFSDBG_FACILITY NFSDBG_CALLBACK
#endif
 
__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;

        dprintk("NFS: GETATTR callback request from %s\n",
                rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));

        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", __func__, 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;

        dprintk("NFS: RECALL callback request from %s\n",
                rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));

        do {
                struct nfs_client *prev = clp;

                inode = nfs_delegation_find_inode(clp, &args->fh);
                if (inode != NULL) {
                        /* 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:
                                        if (res != 0)
                                                res = htonl(NFS4ERR_BAD_STATEID);
                                        break;
                                default:
                                        res = htonl(NFS4ERR_RESOURCE);
                        }
                        iput(inode);
                }
                clp = nfs_find_client_next(prev);
                nfs_put_client(prev);
        } while (clp != NULL);
out:
        dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
        return res;
}