Merge with Linux 2.5.74.

[linux-2.6/linux-mips.git] / fs / nfsd / nfs4proc.c

/*
 *  fs/nfsd/nfs4proc.c
 *
 *  Server-side procedures for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *  Andy Adamson   <andros@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Note: some routines in this file are just trivial wrappers
 * (e.g. nfsd4_lookup()) defined solely for the sake of consistent
 * naming.  Since all such routines have been declared "inline",
 * there shouldn't be any associated overhead.  At some point in
 * the future, I might inline these "by hand" to clean up a
 * little.
 */

#include <linux/param.h>
#include <linux/major.h>
#include <linux/slab.h>

#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfs4.h>
#include <linux/nfsd/state.h>
#include <linux/nfsd/xdr4.h>

#define NFSDDBG_FACILITY                NFSDDBG_PROC

/* Note: The organization of the OPEN code seems a little strange; it
 * has been superfluously split into three routines, one of which is named
 * nfsd4_process_open2() even though there is no nfsd4_process_open1()!
 * This is because the code has been organized in anticipation of a
 * subsequent patch which will implement more of the NFSv4 state model.
 */
static int
do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
        struct svc_fh resfh;
        int accmode, status;

        fh_init(&resfh, NFS4_FHSIZE);
        open->op_truncate = 0;

        if (open->op_create) {
                /*
                 * Note: create modes (UNCHECKED,GUARDED...) are the same
                 * in NFSv4 as in v3.
                 */
                status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
                                        open->op_fname.len, &open->op_iattr,
                                        &resfh, open->op_createmode,
                                        (u32 *)open->op_verf, &open->op_truncate);
        }
        else {
                status = nfsd_lookup(rqstp, current_fh,
                                     open->op_fname.data, open->op_fname.len, &resfh);
                fh_unlock(current_fh);
        }

        if (!status) {
                set_change_info(&open->op_cinfo, current_fh);
                fh_dup2(current_fh, &resfh);

                accmode = MAY_NOP;
                if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
                        accmode = MAY_READ;
                if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE)
                        accmode |= (MAY_WRITE | MAY_TRUNC);
                status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
        }

        fh_put(&resfh);
        return status;
}

static inline int
nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
        int status;
        dprintk("NFSD: nfsd4_open filename %.*s\n",open->op_fname.len, open->op_fname.data);

        /* This check required by spec. */
        if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
                return nfserr_inval;

        /* check seqid for replay. set nfs4_owner */
        status = nfsd4_process_open1(open);
        if (status)
                return status;
        /*
         * This block of code will (1) set CURRENT_FH to the file being opened,
         * creating it if necessary, (2) set open->op_cinfo, 
         * (3) set open->op_truncate if the file is to be truncated 
         * after opening, (4) do permission checking.
         */
        status = do_open_lookup(rqstp, current_fh, open);
        if (status)
                return status;

        /*
         * nfsd4_process_open2() does the actual opening of the file.  If
         * successful, it (1) truncates the file if open->op_truncate was
         * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
         */
        status = nfsd4_process_open2(rqstp, current_fh, open);
        if (status)
                return status;
        return 0;
}

/*
 * filehandle-manipulating ops.
 */
static inline int
nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
{
        if (!current_fh->fh_dentry)
                return nfserr_nofilehandle;

        *getfh = current_fh;
        return nfs_ok;
}

static inline int
nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
{
        fh_put(current_fh);
        current_fh->fh_handle.fh_size = putfh->pf_fhlen;
        memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
        return fh_verify(rqstp, current_fh, 0, MAY_NOP);
}

static inline int
nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
{
        fh_put(current_fh);
        return exp_pseudoroot(rqstp->rq_client, current_fh,
                              &rqstp->rq_chandle);
}

static inline int
nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
{
        if (!save_fh->fh_dentry)
                return nfserr_nofilehandle;

        fh_dup2(current_fh, save_fh);
        return nfs_ok;
}

static inline int
nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
{
        if (!current_fh->fh_dentry)
                return nfserr_nofilehandle;

        fh_dup2(save_fh, current_fh);
        return nfs_ok;
}

/*
 * misc nfsv4 ops
 */
static inline int
nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
{
        if (access->ac_req_access & ~NFS3_ACCESS_FULL)
                return nfserr_inval;

        access->ac_resp_access = access->ac_req_access;
        return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
}

static inline int
nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
{
        u32 *p = (u32 *)commit->co_verf;
        *p++ = nfssvc_boot.tv_sec;
        *p++ = nfssvc_boot.tv_usec;

        return nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
}

static inline int
nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
{
        struct svc_fh resfh;
        int status;
        dev_t rdev;

        fh_init(&resfh, NFS4_FHSIZE);

        status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
        if (status)
                return status;

        switch (create->cr_type) {
        case NF4LNK:
                /* ugh! we have to null-terminate the linktext, or
                 * vfs_symlink() will choke.  it is always safe to
                 * null-terminate by brute force, since at worst we
                 * will overwrite the first byte of the create namelen
                 * in the XDR buffer, which has already been extracted
                 * during XDR decode.
                 */
                create->cr_linkname[create->cr_linklen] = 0;

                status = nfsd_symlink(rqstp, current_fh, create->cr_name,
                                      create->cr_namelen, create->cr_linkname,
                                      create->cr_linklen, &resfh, &create->cr_iattr);
                break;

        case NF4BLK:
                rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
                if (MAJOR(rdev) != create->cr_specdata1 ||
                    MINOR(rdev) != create->cr_specdata2)
                        return nfserr_inval;
                status = nfsd_create(rqstp, current_fh, create->cr_name,
                                     create->cr_namelen, &create->cr_iattr,
                                     S_IFBLK, rdev, &resfh);
                break;

        case NF4CHR:
                rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
                if (MAJOR(rdev) != create->cr_specdata1 ||
                    MINOR(rdev) != create->cr_specdata2)
                        return nfserr_inval;
                status = nfsd_create(rqstp, current_fh, create->cr_name,
                                     create->cr_namelen, &create->cr_iattr,
                                     S_IFCHR, rdev, &resfh);
                break;

        case NF4SOCK:
                status = nfsd_create(rqstp, current_fh, create->cr_name,
                                     create->cr_namelen, &create->cr_iattr,
                                     S_IFSOCK, 0, &resfh);
                break;

        case NF4FIFO:
                status = nfsd_create(rqstp, current_fh, create->cr_name,
                                     create->cr_namelen, &create->cr_iattr,
                                     S_IFIFO, 0, &resfh);
                break;

        case NF4DIR:
                create->cr_iattr.ia_valid &= ~ATTR_SIZE;
                status = nfsd_create(rqstp, current_fh, create->cr_name,
                                     create->cr_namelen, &create->cr_iattr,
                                     S_IFDIR, 0, &resfh);
                break;

        default:
                BUG();
        }

        if (!status) {
                fh_unlock(current_fh);
                set_change_info(&create->cr_cinfo, current_fh);
                fh_dup2(current_fh, &resfh);
        }

        fh_put(&resfh);
        return status;
}

static inline int
nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
{
        int status;

        status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
        if (status)
                return status;

        if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
                return nfserr_inval;

        getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
        getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;

        getattr->ga_fhp = current_fh;
        return nfs_ok;
}

static inline int
nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
           struct svc_fh *save_fh, struct nfsd4_link *link)
{
        int status;

        status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
        if (!status)
                set_change_info(&link->li_cinfo, current_fh);
        return status;
}

static inline int
nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
{
        /*
         * XXX: We currently violate the spec in one small respect
         * here.  If LOOKUPP is done at the root of the pseudofs,
         * the spec requires us to return NFSERR_NOENT.  Personally,
         * I think that leaving the filehandle unchanged is more
         * logical, but this is an academic question anyway, since
         * no clients actually use LOOKUPP.
         */
        return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
}

static inline int
nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
{
        return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
}

static inline int
nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
{
        struct nfs4_stateid *stp;
        int status;

        /* no need to check permission - this will be done in nfsd_read() */

        if (read->rd_offset >= OFFSET_MAX)
                return nfserr_inval;

        nfsd4_lock_state();
        status = nfs_ok;
        /* For stateid -1, we don't check share reservations.  */
        if (ONE_STATEID(&read->rd_stateid)) {
                dprintk("NFSD: nfsd4_read: -1 stateid...\n");
                goto out;
        }
        /*
        * For stateid 0, the client doesn't have to have the file open, but
        * we still check for share reservation conflicts. 
        */
        if (ZERO_STATEID(&read->rd_stateid)) {
                dprintk("NFSD: nfsd4_read: zero stateid...\n");
                if ((status = nfs4_share_conflict(current_fh, NFS4_SHARE_DENY_READ))) {
                        dprintk("NFSD: nfsd4_read: conflicting share reservation!\n");
                        goto out;
                }
                status = nfs_ok;
                goto out;
        }
        /* check stateid */
        if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid, 
                                        CHECK_FH, &stp))) {
                dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
                goto out;
        }
        status = nfserr_openmode;
        if (!(stp->st_share_access & NFS4_SHARE_ACCESS_READ)) {
                dprintk("NFSD: nfsd4_read: file not opened for read!\n");
                goto out;
        }
        status = nfs_ok;
out:
        nfsd4_unlock_state();
        read->rd_rqstp = rqstp;
        read->rd_fhp = current_fh;
        return status;
}

static inline int
nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
{
        /* no need to check permission - this will be done in nfsd_readdir() */

        if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
                return nfserr_inval;

        readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
        readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;

        if (readdir->rd_cookie > ~(u32)0)
                return nfserr_bad_cookie;

        readdir->rd_rqstp = rqstp;
        readdir->rd_fhp = current_fh;
        return nfs_ok;
}

static inline int
nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
{
        readlink->rl_rqstp = rqstp;
        readlink->rl_fhp = current_fh;
        return nfs_ok;
}

static inline int
nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
{
        int status;

        status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
        if (!status) {
                fh_unlock(current_fh);
                set_change_info(&remove->rm_cinfo, current_fh);
        }
        return status;
}

static inline int
nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
             struct svc_fh *save_fh, struct nfsd4_rename *rename)
{
        int status;

        status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
                             rename->rn_snamelen, current_fh,
                             rename->rn_tname, rename->rn_tnamelen);
        if (!status) {
                set_change_info(&rename->rn_sinfo, current_fh);
                set_change_info(&rename->rn_tinfo, save_fh);
        }
        return status;
}

static inline int
nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
{
        struct nfs4_stateid *stp;
        int status = nfs_ok;

        if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {

                status = nfserr_bad_stateid;
                if (ZERO_STATEID(&setattr->sa_stateid) || ONE_STATEID(&setattr->sa_stateid)) {
                        dprintk("NFSD: nfsd4_setattr: magic stateid!\n");
                        return status;
                }

                nfsd4_lock_state();
                if ((status = nfs4_preprocess_stateid_op(current_fh, 
                                                &setattr->sa_stateid, 
                                                CHECK_FH, &stp))) {
                        dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
                        goto out;
                }
                status = nfserr_openmode;
                if (!(stp->st_share_access & NFS4_SHARE_ACCESS_WRITE)) {
                        dprintk("NFSD: nfsd4_setattr: not opened for write!\n");
                        goto out;
                }
                nfsd4_unlock_state();
        }
        return (nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr, 0, (time_t)0));
out:
        nfsd4_unlock_state();
        return status;
}

static inline int
nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
{
        struct nfs4_stateid *stp;
        stateid_t *stateid = &write->wr_stateid;
        u32 *p;
        int status = nfs_ok;

        /* no need to check permission - this will be done in nfsd_write() */

        if (write->wr_offset >= OFFSET_MAX)
                return nfserr_inval;

        nfsd4_lock_state();
        if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
                dprintk("NFSD: nfsd4_write: zero stateid...\n");
                if ((status = nfs4_share_conflict(current_fh, NFS4_SHARE_DENY_WRITE))) {
                        dprintk("NFSD: nfsd4_write: conflicting share reservation!\n");
                        goto out;
                }
                goto zero_stateid;
        }
        if ((status = nfs4_preprocess_stateid_op(current_fh, stateid, 
                                        CHECK_FH, &stp))) {
                dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
                goto out;
        }

        status = nfserr_openmode;
        if (!(stp->st_share_access & NFS4_SHARE_ACCESS_WRITE)) {
                dprintk("NFSD: nfsd4_write: file not open for write!\n");
                goto out;
        }

zero_stateid:
        nfsd4_unlock_state();
        write->wr_bytes_written = write->wr_buflen;
        write->wr_how_written = write->wr_stable_how;
        p = (u32 *)write->wr_verifier;
        *p++ = nfssvc_boot.tv_sec;
        *p++ = nfssvc_boot.tv_usec;

        return (nfsd_write(rqstp, current_fh, write->wr_offset,
                          write->wr_vec, write->wr_vlen, write->wr_buflen,
                          &write->wr_how_written));
out:
        nfsd4_unlock_state();
        return status;
}

/* This routine never returns NFS_OK!  If there are no other errors, it
 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 */
static int
nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
{
        u32 *buf, *p;
        int count;
        int status;

        status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
        if (status)
                return status;

        if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
            || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
                return nfserr_notsupp;
        if (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
                return nfserr_inval;
        if (verify->ve_attrlen & 3)
                return nfserr_inval;

        /* count in words:
         *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
         */
        count = 4 + (verify->ve_attrlen >> 2);
        buf = kmalloc(count << 2, GFP_KERNEL);
        if (!buf)
                return nfserr_resource;

        status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
                                    current_fh->fh_dentry, buf,
                                    &count, verify->ve_bmval);

        /* this means that nfsd4_encode_fattr() ran out of space */
        if (status == nfserr_resource && count == 0)
                status = nfserr_not_same;
        if (status)
                goto out_kfree;

        p = buf + 3;
        status = nfserr_not_same;
        if (ntohl(*p++) != verify->ve_attrlen)
                goto out_kfree;
        if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
                status = nfserr_same;

out_kfree:
        kfree(buf);
        return status;
}

/*
 * NULL call.
 */
static int
nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
        return nfs_ok;
}


/*
 * COMPOUND call.
 */
static int
nfsd4_proc_compound(struct svc_rqst *rqstp,
                    struct nfsd4_compoundargs *args,
                    struct nfsd4_compoundres *resp)
{
        struct nfsd4_op *op;
        struct svc_fh   current_fh;
        struct svc_fh   save_fh;
        int             slack_space;    /* in words, not bytes! */
        int             status;

        fh_init(&current_fh, NFS4_FHSIZE);
        fh_init(&save_fh, NFS4_FHSIZE);

        resp->xbuf = &rqstp->rq_res;
        resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
        resp->tagp = resp->p;
        /* reserve space for: taglen, tag, and opcnt */
        resp->p += 2 + XDR_QUADLEN(args->taglen);
        resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
        resp->taglen = args->taglen;
        resp->tag = args->tag;
        resp->opcnt = 0;
        resp->rqstp = rqstp;

        /*
         * According to RFC3010, this takes precedence over all other errors.
         */
        status = nfserr_minor_vers_mismatch;
        if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
                goto out;

        status = nfs_ok;
        while (!status && resp->opcnt < args->opcnt) {
                op = &args->ops[resp->opcnt++];

                /*
                 * The XDR decode routines may have pre-set op->status;
                 * for example, if there is a miscellaneous XDR error
                 * it will be set to nfserr_bad_xdr.
                 */
                if (op->status)
                        goto encode_op;

                /* We must be able to encode a successful response to
                 * this operation, with enough room left over to encode a
                 * failed response to the next operation.  If we don't
                 * have enough room, fail with ERR_RESOURCE.
                 */
/* FIXME - is slack_space *really* words, or bytes??? - neilb */
                slack_space = (char *)resp->end - (char *)resp->p;
                if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
                        BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
                        op->status = nfserr_resource;
                        goto encode_op;
                }

                switch (op->opnum) {
                case OP_ACCESS:
                        op->status = nfsd4_access(rqstp, &current_fh, &op->u.access);
                        break;
                case OP_CLOSE:
                        op->status = nfsd4_close(rqstp, &current_fh, &op->u.close);
                        break;
                case OP_COMMIT:
                        op->status = nfsd4_commit(rqstp, &current_fh, &op->u.commit);
                        break;
                case OP_CREATE:
                        op->status = nfsd4_create(rqstp, &current_fh, &op->u.create);
                        break;
                case OP_GETATTR:
                        op->status = nfsd4_getattr(rqstp, &current_fh, &op->u.getattr);
                        break;
                case OP_GETFH:
                        op->status = nfsd4_getfh(&current_fh, &op->u.getfh);
                        break;
                case OP_LINK:
                        op->status = nfsd4_link(rqstp, &current_fh, &save_fh, &op->u.link);
                        break;
                case OP_LOOKUP:
                        op->status = nfsd4_lookup(rqstp, &current_fh, &op->u.lookup);
                        break;
                case OP_LOOKUPP:
                        op->status = nfsd4_lookupp(rqstp, &current_fh);
                        break;
                case OP_NVERIFY:
                        op->status = nfsd4_verify(rqstp, &current_fh, &op->u.nverify);
                        if (op->status == nfserr_not_same)
                                op->status = nfs_ok;
                        break;
                case OP_OPEN:
                        op->status = nfsd4_open(rqstp, &current_fh, &op->u.open);
                        break;
                case OP_OPEN_CONFIRM:
                        op->status = nfsd4_open_confirm(rqstp, &current_fh, &op->u.open_confirm);
                        break;
                case OP_OPEN_DOWNGRADE:
                        op->status = nfsd4_open_downgrade(rqstp, &current_fh, &op->u.open_downgrade);
                        break;
                case OP_PUTFH:
                        op->status = nfsd4_putfh(rqstp, &current_fh, &op->u.putfh);
                        break;
                case OP_PUTROOTFH:
                        op->status = nfsd4_putrootfh(rqstp, &current_fh);
                        break;
                case OP_READ:
                        op->status = nfsd4_read(rqstp, &current_fh, &op->u.read);
                        break;
                case OP_READDIR:
                        op->status = nfsd4_readdir(rqstp, &current_fh, &op->u.readdir);
                        break;
                case OP_READLINK:
                        op->status = nfsd4_readlink(rqstp, &current_fh, &op->u.readlink);
                        break;
                case OP_REMOVE:
                        op->status = nfsd4_remove(rqstp, &current_fh, &op->u.remove);
                        break;
                case OP_RENAME:
                        op->status = nfsd4_rename(rqstp, &current_fh, &save_fh, &op->u.rename);
                        break;
                case OP_RENEW:
                        op->status = nfsd4_renew(&op->u.renew);
                        break;
                case OP_RESTOREFH:
                        op->status = nfsd4_restorefh(&current_fh, &save_fh);
                        break;
                case OP_SAVEFH:
                        op->status = nfsd4_savefh(&current_fh, &save_fh);
                        break;
                case OP_SETATTR:
                        op->status = nfsd4_setattr(rqstp, &current_fh, &op->u.setattr);
                        break;
                case OP_SETCLIENTID:
                        op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
                        break;
                case OP_SETCLIENTID_CONFIRM:
                        op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
                        break;
                case OP_VERIFY:
                        op->status = nfsd4_verify(rqstp, &current_fh, &op->u.verify);
                        if (op->status == nfserr_same)
                                op->status = nfs_ok;
                        break;
                case OP_WRITE:
                        op->status = nfsd4_write(rqstp, &current_fh, &op->u.write);
                        break;
                default:
                        BUG_ON(op->status == nfs_ok);
                        break;
                }

encode_op:
                nfsd4_encode_operation(resp, op);
                status = op->status;
        }

out:
        if (args->ops != args->iops) {
                kfree(args->ops);
                args->ops = args->iops;
        }
        if (args->tmpp) {
                kfree(args->tmpp);
                args->tmpp = NULL;
        }
        while (args->to_free) {
                struct tmpbuf *tb = args->to_free;
                args->to_free = tb->next;
                kfree(tb->buf);
                kfree(tb);
        }
        fh_put(&current_fh);
        fh_put(&save_fh);
        return status;
}

#define nfs4svc_decode_voidargs         NULL
#define nfs4svc_release_void            NULL
#define nfsd4_voidres                   nfsd4_voidargs
#define nfs4svc_release_compound        NULL
struct nfsd4_voidargs { int dummy; };

#define PROC(name, argt, rest, relt, cache, respsize)   \
 { (svc_procfunc) nfsd4_proc_##name,            \
   (kxdrproc_t) nfs4svc_decode_##argt##args,    \
   (kxdrproc_t) nfs4svc_encode_##rest##res,     \
   (kxdrproc_t) nfs4svc_release_##relt,         \
   sizeof(struct nfsd4_##argt##args),           \
   sizeof(struct nfsd4_##rest##res),            \
   0,                                           \
   cache,                                       \
   respsize,                                    \
 }

/*
 * TODO: At the present time, the NFSv4 server does not do XID caching
 * of requests.  Implementing XID caching would not be a serious problem,
 * although it would require a mild change in interfaces since one
 * doesn't know whether an NFSv4 request is idempotent until after the
 * XDR decode.  However, XID caching totally confuses pynfs (Peter
 * Astrand's regression testsuite for NFSv4 servers), which reuses
 * XID's liberally, so I've left it unimplemented until pynfs generates
 * better XID's.
 */
static struct svc_procedure             nfsd_procedures4[2] = {
  PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
  PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
};

struct svc_version      nfsd_version4 = {
                .vs_vers        = 4,
                .vs_nproc       = 2,
                .vs_proc        = nfsd_procedures4,
                .vs_dispatch    = nfsd_dispatch,
                .vs_xdrsize     = NFS4_SVC_XDRSIZE,
};

/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */