fs/nfs/nfs4_srv_readdir.c

	nfs4_srv_readdir.c revision f3b585ce799a83688c5532c430f6133f098431c2
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/cred.h>
#include <sys/buf.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/errno.h>
#include <sys/sysmacros.h>
#include <sys/statvfs.h>
#include <sys/kmem.h>
#include <sys/dirent.h>
#include <rpc/types.h>
#include <rpc/auth.h>
#include <rpc/rpcsec_gss.h>
#include <rpc/svc.h>
#include <sys/strsubr.h>
#include <sys/strsun.h>
#include <sys/sdt.h>

#include <nfs/nfs.h>
#include <nfs/export.h>
#include <nfs/nfs4.h>


/*
 * RFS4_MINLEN_ENTRY4: XDR-encoded size of smallest possible dirent.
 *  This is used to return NFS4ERR_TOOSMALL when clients specify
 *  maxcount that isn't large enough to hold the smallest possible
 *  XDR encoded dirent.
 *
 *      sizeof cookie (8 bytes) +
 *      sizeof name_len (4 bytes) +
 *      sizeof smallest (padded) name (4 bytes) +
 *      sizeof bitmap4_len (12 bytes) +   NOTE: we always encode len=2 bm4
 *      sizeof attrlist4_len (4 bytes) +
 *      sizeof next boolean (4 bytes)
 *
 * RFS4_MINLEN_RDDIR4: XDR-encoded size of READDIR op reply containing
 * the smallest possible entry4 (assumes no attrs requested).
 *  sizeof nfsstat4 (4 bytes) +
 *  sizeof verifier4 (8 bytes) +
 *  sizeof entsecond_to_ry4list bool (4 bytes) +
 *  sizeof entry4   (36 bytes) +
 *  sizeof eof bool  (4 bytes)
 *
 * RFS4_MINLEN_RDDIR_BUF: minimum length of buffer server will provide to
 *  VOP_READDIR.  Its value is the size of the maximum possible dirent
 *  for solaris.  The DIRENT64_RECLEN macro returns the size of dirent
 *  required for a given name length.  MAXNAMELEN is the maximum
 *  filename length allowed in Solaris.  The first two DIRENT64_RECLEN()
 *  macros are to allow for . and .. entries -- just a minor tweak to try
 *  and guarantee that buffer we give to VOP_READDIR will be large enough
 *  to hold ., .., and the largest possible solaris dirent64.
 */
#define RFS4_MINLEN_ENTRY4 36
#define RFS4_MINLEN_RDDIR4 (4 + NFS4_VERIFIER_SIZE + 4 + RFS4_MINLEN_ENTRY4 + 4)
#define RFS4_MINLEN_RDDIR_BUF \
    (DIRENT64_RECLEN(1) + DIRENT64_RECLEN(2) + DIRENT64_RECLEN(MAXNAMELEN))


#ifdef  nextdp
#undef nextdp
#endif
#define nextdp(dp)  ((struct dirent64 *)((char *)(dp) + (dp)->d_reclen))

verifier4   Readdir4verf = 0x0;

static nfs_ftype4 vt_to_nf4[] = {
    0, NF4REG, NF4DIR, NF4BLK, NF4CHR, NF4LNK, NF4FIFO, 0, 0, NF4SOCK, 0
};


int
nfs4_readdir_getvp(vnode_t *dvp, char *d_name, vnode_t **vpp,
        struct exportinfo **exi, struct svc_req *req,
        struct compound_state *cs, int expseudo)
{
    int error;
    int ismntpt;
    fid_t fid;
    vnode_t *vp, *pre_tvp;
    nfsstat4 status;
    struct exportinfo *newexi, *saveexi;
    cred_t *scr;

    *vpp = vp = NULL;

    if (error = VOP_LOOKUP(dvp, d_name, &vp, NULL, 0, NULL, cs->cr,
        NULL, NULL, NULL))
        return (error);

    /* Is this object mounted upon? */
    ismntpt = vn_ismntpt(vp);
    /*
     * Nothing more to do if object is not a mount point or
     * a possible LOFS shadow of an LOFS mount (which won't
     * have v_vfsmountedhere set)
     */
    if (ismntpt == 0 && dvp->v_vfsp == vp->v_vfsp && expseudo == 0) {
        *vpp = vp;
        return (0);
    }

    if (ismntpt) {
        /*
         * Something is mounted here. Traverse and manage the
         * namespace
         */
        pre_tvp = vp;
        VN_HOLD(pre_tvp);

        if ((error = traverse(&vp)) != 0) {
            VN_RELE(pre_tvp);
            return (error);
        }
    }

    bzero(&fid, sizeof (fid));
    fid.fid_len = MAXFIDSZ;

    /*
     * If VOP_FID not supported by underlying fs (mntfs, procfs,
     * etc.), then return attrs for stub instead of VROOT object.
     * If it fails for any other reason, then return the error.
     */
    if (error = VOP_FID(vp, &fid, NULL)) {
        if (ismntpt == 0) {
            VN_RELE(vp);
            return (error);
        }

        if (error != ENOSYS && error != ENOTSUP) {
            VN_RELE(vp);
            VN_RELE(pre_tvp);
            return (error);
        }
        /* go back to vnode that is "under" mount */
        VN_RELE(vp);
        *vpp = pre_tvp;
        return (0);
    }

    newexi = checkexport4(&vp->v_vfsp->vfs_fsid, &fid, vp);
    if (newexi == NULL) {
        if (ismntpt == 0) {
            *vpp = vp;
        } else {
            VN_RELE(vp);
            *vpp = pre_tvp;
        }
        return (0);
    }

    if (ismntpt)
        VN_RELE(pre_tvp);

    /* Save the exi and present the new one to checkauth4() */
    saveexi = cs->exi;
    cs->exi = newexi;

    /* Get the right cred like lookup does */
    scr = cs->cr;
    cs->cr = crdup(cs->basecr);

    status = call_checkauth4(cs, req);

    crfree(cs->cr);
    cs->cr = scr;
    cs->exi = saveexi;

    /* Reset what call_checkauth4() may have set */
    *cs->statusp = NFS4_OK;

    if (status != NFS4_OK) {
        VN_RELE(vp);
        if (status == NFS4ERR_DELAY)
            status = NFS4ERR_ACCESS;
        return (status);
    }
    *vpp = vp;
    *exi = newexi;

    return (0);
}

/* This is the set of pathconf data for vfs */
typedef struct {
    uint64_t maxfilesize;
    uint32_t maxlink;
    uint32_t maxname;
} rfs4_pc_encode_t;


static int
rfs4_get_pc_encode(vnode_t *vp, rfs4_pc_encode_t *pce, bitmap4 ar, cred_t *cr)
{
    int error;
    ulong_t pc_val;

    pce->maxfilesize = 0;
    pce->maxlink = 0;
    pce->maxname = 0;

    if (ar & FATTR4_MAXFILESIZE_MASK) {
        /* Maximum File Size */
        if (error = VOP_PATHCONF(vp, _PC_FILESIZEBITS, &pc_val, cr,
            NULL))
            return (error);

        if (pc_val >= (sizeof (uint64_t) * 8))
            pce->maxfilesize = UINT64_MAX;
        else
            pce->maxfilesize = ((1LL << pc_val) - 1);
    }

    if (ar & FATTR4_MAXLINK_MASK) {
        /* Maximum Link Count */
        if (error = VOP_PATHCONF(vp, _PC_LINK_MAX, &pc_val, cr, NULL))
            return (error);

        pce->maxlink = pc_val;
    }

    if (ar & FATTR4_MAXNAME_MASK) {
        /* Maximum Name Length */
        if (error = VOP_PATHCONF(vp, _PC_NAME_MAX, &pc_val, cr, NULL))
            return (error);

        pce->maxname = pc_val;
    }

    return (0);
}

/* This is the set of statvfs data that is ready for encoding */
typedef struct {
    uint64_t space_avail;
    uint64_t space_free;
    uint64_t space_total;
    u_longlong_t fa;
    u_longlong_t ff;
    u_longlong_t ft;
} rfs4_sb_encode_t;

static int
rfs4_get_sb_encode(vfs_t *vfsp, rfs4_sb_encode_t *psbe)
{
    int error;
    struct statvfs64 sb;

    /* Grab the per filesystem info */
    if (error = VFS_STATVFS(vfsp, &sb)) {
        return (error);
    }

    /* Calculate space available */
    if (sb.f_bavail != (fsblkcnt64_t)-1) {
        psbe->space_avail =
            (fattr4_space_avail) sb.f_frsize *
            (fattr4_space_avail) sb.f_bavail;
    } else {
        psbe->space_avail =
            (fattr4_space_avail) sb.f_bavail;
    }

    /* Calculate space free */
    if (sb.f_bfree != (fsblkcnt64_t)-1) {
        psbe->space_free =
            (fattr4_space_free) sb.f_frsize *
            (fattr4_space_free) sb.f_bfree;
    } else {
        psbe->space_free =
            (fattr4_space_free) sb.f_bfree;
    }

    /* Calculate space total */
    if (sb.f_blocks != (fsblkcnt64_t)-1) {
        psbe->space_total =
            (fattr4_space_total) sb.f_frsize *
            (fattr4_space_total) sb.f_blocks;
    } else {
        psbe->space_total =
            (fattr4_space_total) sb.f_blocks;
    }

    /* For use later on attr encode */
    psbe->fa = sb.f_favail;
    psbe->ff = sb.f_ffree;
    psbe->ft = sb.f_files;

    return (0);
}

/*
 * Macros to handle if we have don't have enough space for the requested
 * attributes and this is the first entry and the
 * requested attributes are more than the minimal useful
 * set, reset the attributes to the minimal set and
 * retry the encoding. If the client has asked for both
 * mounted_on_fileid and fileid, prefer mounted_on_fileid.
 */
#define MINIMAL_RD_ATTRS                        \
    (FATTR4_MOUNTED_ON_FILEID_MASK|                 \
    FATTR4_FILEID_MASK|                     \
    FATTR4_RDATTR_ERROR_MASK)

#define MINIMIZE_ATTR_MASK(m) {                     \
    if ((m) & FATTR4_MOUNTED_ON_FILEID_MASK)            \
        (m) &= FATTR4_RDATTR_ERROR_MASK|FATTR4_MOUNTED_ON_FILEID_MASK;\
    else                                \
        (m) &= FATTR4_RDATTR_ERROR_MASK|FATTR4_FILEID_MASK;     \
}

#define IS_MIN_ATTR_MASK(m) (((m) & ~MINIMAL_RD_ATTRS) == 0)
/*
 * If readdir only needs to return FILEID, we can take it from the
 * dirent struct and save doing the lookup.
 */
/* ARGSUSED */
void
rfs4_op_readdir(nfs_argop4 *argop, nfs_resop4 *resop,
    struct svc_req *req, struct compound_state *cs)
{
    READDIR4args *args = &argop->nfs_argop4_u.opreaddir;
    READDIR4res *resp = &resop->nfs_resop4_u.opreaddir;
    struct exportinfo *newexi = NULL;
    int error;
    mblk_t *mp;
    uint_t mpcount;
    int alloc_err = 0;
    vnode_t *dvp = cs->vp;
    vnode_t *vp;
    vattr_t va;
    struct dirent64 *dp;
    rfs4_sb_encode_t dsbe, sbe;
    int vfs_different;
    int rddir_data_len, rddir_result_size;
    caddr_t rddir_data;
    offset_t rddir_next_offset;
    int dircount;
    int no_space;
    int iseofdir;
    uint_t eof;
    struct iovec iov;
    struct uio uio;
    int tsize;
    int check_visible;
    int expseudo = 0;

    uint32_t *ptr, *ptr_redzone;
    uint32_t *beginning_ptr;
    uint32_t *lastentry_ptr;
    uint32_t *attrmask_ptr;
    uint32_t *attr_offset_ptr;
    uint32_t attr_length;
    uint32_t rndup;
    uint32_t namelen;
    uint32_t rddirattr_error = 0;
    int nents;
    bitmap4 ar = args->attr_request & NFS4_SRV_RDDIR_SUPPORTED_ATTRS;
    bitmap4 ae;
    rfs4_pc_encode_t dpce, pce;
    ulong_t pc_val;
    uint64_t maxread;
    uint64_t maxwrite;
    uint_t true = TRUE;
    uint_t false = FALSE;
    uid_t lastuid;
    gid_t lastgid;
    int lu_set, lg_set;
    utf8string owner, group;
    int owner_error, group_error;

    DTRACE_NFSV4_2(op__readdir__start, struct compound_state *, cs,
        READDIR4args *, args);

    lu_set = lg_set = 0;
    owner.utf8string_len = group.utf8string_len = 0;
    owner.utf8string_val = group.utf8string_val = NULL;

    resp->mblk = NULL;

    /* Maximum read and write size */
    maxread = maxwrite = rfs4_tsize(req);

    if (dvp == NULL) {
        *cs->statusp = resp->status = NFS4ERR_NOFILEHANDLE;
        goto out;
    }

    /*
     * If there is an unshared filesystem mounted on this vnode,
     * do not allow readdir in this directory.
     */
    if (vn_ismntpt(dvp)) {
        *cs->statusp = resp->status = NFS4ERR_ACCESS;
        goto out;
    }

    if (dvp->v_type != VDIR) {
        *cs->statusp = resp->status = NFS4ERR_NOTDIR;
        goto out;
    }

    if (args->maxcount <= RFS4_MINLEN_RDDIR4) {
        *cs->statusp = resp->status = NFS4ERR_TOOSMALL;
        goto out;
    }

    /*
     * If write-only attrs are requested, then fail the readdir op
     */
    if (args->attr_request &
        (FATTR4_TIME_MODIFY_SET_MASK | FATTR4_TIME_ACCESS_SET_MASK)) {
        *cs->statusp = resp->status = NFS4ERR_INVAL;
        goto out;
    }

    error = VOP_ACCESS(dvp, VREAD, 0, cs->cr, NULL);
    if (error) {
        *cs->statusp = resp->status = puterrno4(error);
        goto out;
    }

    if (args->cookieverf != Readdir4verf) {
        *cs->statusp = resp->status = NFS4ERR_NOT_SAME;
        goto out;
    }

    /* Is there pseudo-fs work that is needed for this readdir? */
    check_visible = PSEUDO(cs->exi) ||
        ! is_exported_sec(cs->nfsflavor, cs->exi) ||
        cs->access & CS_ACCESS_LIMITED;

    /* Check the requested attributes and only do the work if needed */

    if (ar & (FATTR4_MAXFILESIZE_MASK |
        FATTR4_MAXLINK_MASK |
        FATTR4_MAXNAME_MASK)) {
        if (error = rfs4_get_pc_encode(cs->vp, &dpce, ar, cs->cr)) {
            *cs->statusp = resp->status = puterrno4(error);
            goto out;
        }
        pce = dpce;
    }

    /* If there is statvfs data requested, pick it up once */
    if (ar &
        (FATTR4_FILES_AVAIL_MASK |
        FATTR4_FILES_FREE_MASK |
        FATTR4_FILES_TOTAL_MASK |
        FATTR4_FILES_AVAIL_MASK |
        FATTR4_FILES_FREE_MASK |
        FATTR4_FILES_TOTAL_MASK)) {
        if (error = rfs4_get_sb_encode(dvp->v_vfsp, &dsbe)) {
            *cs->statusp = resp->status = puterrno4(error);
            goto out;
        }
        sbe = dsbe;
    }

    /*
     * Max transfer size of the server is the absolute limite.
     * If the client has decided to max out with something really
     * tiny, then return toosmall.  Otherwise, move forward and
     * see if a single entry can be encoded.
     */
    tsize = rfs4_tsize(req);
    if (args->maxcount > tsize)
        args->maxcount = tsize;
    else if (args->maxcount < RFS4_MINLEN_RDDIR_BUF) {
        if (args->maxcount < RFS4_MINLEN_ENTRY4) {
            *cs->statusp = resp->status = NFS4ERR_TOOSMALL;
            goto out;
        }
    }

    /*
     * How large should the mblk be for outgoing encoding.
     */
    if (args->maxcount < MAXBSIZE)
        mpcount = MAXBSIZE;
    else
        mpcount = args->maxcount;

    /*
     * mp will contain the data to be sent out in the readdir reply.
     * It will be freed after the reply has been sent.
     * Let's roundup the data to a BYTES_PER_XDR_UNIX multiple,
     * so that the call to xdrmblk_putmblk() never fails.
     */
    mp = allocb(RNDUP(mpcount), BPRI_MED);

    if (mp == NULL) {
        /*
         * The allocation of the client's requested size has
         * failed.  It may be that the size is too large for
         * current system utilization; step down to a "common"
         * size and wait for the allocation to occur.
         */
        if (mpcount > MAXBSIZE)
            args->maxcount = mpcount = MAXBSIZE;
        mp = allocb_wait(RNDUP(mpcount), BPRI_MED,
                STR_NOSIG, &alloc_err);
    }

    ASSERT(mp != NULL);
    ASSERT(alloc_err == 0);

    resp->mblk = mp;

    ptr = beginning_ptr = (uint32_t *)mp->b_datap->db_base;

    /*
     * The "redzone" at the end of the encoding buffer is used
     * to deal with xdr encoding length.  Instead of checking
     * each encoding of an attribute value before it is done,
     * make the assumption that it will fit into the buffer and
     * check occasionally.
     *
     * The largest block of attributes that are encoded without
     * checking the redzone is 18 * BYTES_PER_XDR_UNIT (72 bytes)
     * "round" to 128 as the redzone size.
     */
    if (args->maxcount < (mpcount - 128))
        ptr_redzone =
            (uint32_t *)(((char *)ptr) + RNDUP(args->maxcount));
    else
        ptr_redzone =
            (uint32_t *)((((char *)ptr) + RNDUP(mpcount)) - 128);

    /*
     * Set the dircount; this will be used as the size for the
     * readdir of the underlying filesystem.  First make sure
     * that it is large enough to do a reasonable readdir (client
     * may have short changed us - it is an advisory number);
     * then make sure that it isn't too large.
     * After all of that, if maxcount is "small" then just use
     * that for the dircount number.
     */
    dircount = (args->dircount < MAXBSIZE) ? MAXBSIZE : args->dircount;
    dircount = (dircount > tsize) ? tsize : dircount;
    if (dircount > args->maxcount)
        dircount = args->maxcount;
    if (args->maxcount <= MAXBSIZE) {
        if (args->maxcount < RFS4_MINLEN_RDDIR_BUF)
            dircount = RFS4_MINLEN_RDDIR_BUF;
        else
            dircount = args->maxcount;
    }

    /* number of entries fully encoded in outgoing buffer */
    nents = 0;

    /* ENCODE READDIR4res.cookieverf */
    IXDR_PUT_HYPER(ptr, Readdir4verf);

    rddir_data_len = dircount;
    rddir_data = kmem_alloc(rddir_data_len, KM_NOSLEEP);
    if (rddir_data == NULL) {
        /* The allocation failed; downsize and wait for it this time */
        if (rddir_data_len > MAXBSIZE)
            rddir_data_len = dircount = MAXBSIZE;
        rddir_data = kmem_alloc(rddir_data_len, KM_SLEEP);
    }

    rddir_next_offset = (offset_t)args->cookie;

readagain:

    no_space = FALSE;
    iseofdir = FALSE;

    vp = NULL;

    /* Move on to reading the directory contents */
    iov.iov_base = rddir_data;
    iov.iov_len = rddir_data_len;
    uio.uio_iov = &iov;
    uio.uio_iovcnt = 1;
    uio.uio_segflg = UIO_SYSSPACE;
    uio.uio_extflg = UIO_COPY_CACHED;
    uio.uio_loffset = rddir_next_offset;
    uio.uio_resid = rddir_data_len;

    (void) VOP_RWLOCK(dvp, V_WRITELOCK_FALSE, NULL);

    error = VOP_READDIR(dvp, &uio, cs->cr, &iseofdir, NULL, 0);

    VOP_RWUNLOCK(dvp, V_WRITELOCK_FALSE, NULL);

    if (error) {
        kmem_free((caddr_t)rddir_data, rddir_data_len);
        freeb(resp->mblk);
        resp->mblk = NULL;
        resp->data_len = 0;
        *cs->statusp = resp->status = puterrno4(error);
        goto out;
    }


    rddir_result_size = rddir_data_len - uio.uio_resid;

    /* Reading at the end of the directory */
    if (iseofdir && (rddir_result_size == 0)) {
        /* encode the BOOLEAN marking no further entries */
        IXDR_PUT_U_INT32(ptr, false);
        /* encode the BOOLEAN signifying end of directory */
        IXDR_PUT_U_INT32(ptr, true);
        resp->data_len = (char *)ptr - (char *)beginning_ptr;
        resp->mblk->b_wptr += resp->data_len;
        kmem_free((caddr_t)rddir_data, rddir_data_len);
        *cs->statusp = resp->status = NFS4_OK;
        goto out;
    }

    lastentry_ptr = ptr;
    no_space = 0;
    for (dp = (struct dirent64 *)rddir_data;
            !no_space && rddir_result_size > 0; dp = nextdp(dp)) {

        /* reset expseudo */
        expseudo = 0;

        if (vp) {
            VN_RELE(vp);
            vp = NULL;
        }

        if (newexi)
            newexi = NULL;

        rddir_result_size -= dp->d_reclen;

        /* skip "." and ".." entries */
        if (dp->d_ino == 0 || NFS_IS_DOTNAME(dp->d_name)) {
            rddir_next_offset = dp->d_off;
            continue;
        }

        if (check_visible &&
            !nfs_visible_inode(cs->exi, dp->d_ino, &expseudo)) {
            rddir_next_offset = dp->d_off;
            continue;
        }

        /*
         * Only if the client requested attributes...
         * If the VOP_LOOKUP fails ENOENT, then skip this entry
         * for the readdir response.  If there was another error,
         * then set the rddirattr_error and the error will be
         * encoded later in the "attributes" section.
         */
        ae = ar;
        if (ar != 0) {
            error = nfs4_readdir_getvp(dvp, dp->d_name,
                        &vp, &newexi, req, cs,
                        expseudo);
            if (error == ENOENT) {
                rddir_next_offset = dp->d_off;
                continue;
            }

            rddirattr_error = error;

            /*
             * The vp obtained from above may be from a
             * different filesystem mount and the vfs-like
             * attributes should be obtained from that
             * different vfs; only do this if appropriate.
             */
            if (vp &&
                (vfs_different = (dvp->v_vfsp != vp->v_vfsp))) {
                if (ar & (FATTR4_FILES_AVAIL_MASK |
                    FATTR4_FILES_FREE_MASK |
                    FATTR4_FILES_TOTAL_MASK |
                    FATTR4_FILES_AVAIL_MASK |
                    FATTR4_FILES_FREE_MASK |
                    FATTR4_FILES_TOTAL_MASK)) {
                    if (error =
                    rfs4_get_sb_encode(dvp->v_vfsp, &sbe)) {
                        /* Remove attrs from encode */
                        ae &= ~(FATTR4_FILES_AVAIL_MASK |
                        FATTR4_FILES_FREE_MASK |
                        FATTR4_FILES_TOTAL_MASK |
                        FATTR4_FILES_AVAIL_MASK |
                        FATTR4_FILES_FREE_MASK |
                        FATTR4_FILES_TOTAL_MASK);
                        rddirattr_error = error;
                    }
                }
                if (ar & (FATTR4_MAXFILESIZE_MASK |
                    FATTR4_MAXLINK_MASK |
                    FATTR4_MAXNAME_MASK)) {
                    if (error =
                    rfs4_get_pc_encode(cs->vp,
                            &pce, ar, cs->cr)) {
                        ar &= ~(FATTR4_MAXFILESIZE_MASK |
                            FATTR4_MAXLINK_MASK |
                            FATTR4_MAXNAME_MASK);
                        rddirattr_error = error;
                    }
                }
            }
        }

reencode_attrs:
        /* encode the BOOLEAN for the existence of the next entry */
        IXDR_PUT_U_INT32(ptr, true);
        /* encode the COOKIE for the entry */
        IXDR_PUT_U_HYPER(ptr, dp->d_off);

        /* Calculate the dirent name length */
        namelen = strlen(dp->d_name);

        rndup = RNDUP(namelen) / BYTES_PER_XDR_UNIT;

        /* room for LENGTH + string ? */
        if ((ptr + (1 + rndup)) > ptr_redzone) {
            no_space = TRUE;
            continue;
        }

        /* encode the LENGTH of the name */
        IXDR_PUT_U_INT32(ptr, namelen);
        /* encode the RNDUP FILL first */
        ptr[rndup - 1] = 0;
        /* encode the NAME of the entry */
        bcopy(dp->d_name, (char *)ptr, namelen);
        /* now bump the ptr after... */
        ptr += rndup;

        /*
         * Keep checking on the dircount to see if we have
         * reached the limit; from the RFC, dircount is to be
         * the XDR encoded limit of the cookie plus name.
         * So the count is the name, XDR_UNIT of length for
         * that name and 2 * XDR_UNIT bytes of cookie;
         * However, use the regular DIRENT64 to match most
         * client's APIs.
         */
        dircount -= DIRENT64_RECLEN(namelen);
        if (nents != 0 && dircount < 0) {
            no_space = TRUE;
            continue;
        }

        /*
         * Attributes requested?
         * Gather up the attribute info and the previous VOP_LOOKUP()
         * succeeded; if an error occurs on the VOP_GETATTR() then
         * return just the error (again if it is requested).
         * Note that the previous VOP_LOOKUP() could have failed
         * itself which leaves this code without anything for
         * a VOP_GETATTR().
         * Also note that the readdir_attr_error is left in the
         * encoding mask if requested and so is the mounted_on_fileid.
         */
        if (ae != 0) {
            if (!vp) {
                ae = ar & (FATTR4_RDATTR_ERROR_MASK |
                    FATTR4_MOUNTED_ON_FILEID_MASK);
            } else {
                va.va_mask = AT_ALL;
                rddirattr_error =
                    VOP_GETATTR(vp, &va, 0, cs->cr, NULL);
                if (rddirattr_error)
                    ae = ar & (FATTR4_RDATTR_ERROR_MASK |
                        FATTR4_MOUNTED_ON_FILEID_MASK);
            }
        }

        /* START OF ATTRIBUTE ENCODING */

        /* encode the LENGTH of the BITMAP4 array */
        IXDR_PUT_U_INT32(ptr, 2);
        /* encode the BITMAP4 */
        attrmask_ptr = ptr;
        IXDR_PUT_HYPER(ptr, ae);
        attr_offset_ptr = ptr;
        /* encode the default LENGTH of the attributes for entry */
        IXDR_PUT_U_INT32(ptr, 0);

        if (ptr > ptr_redzone) {
            no_space = TRUE;
            continue;
        }

        /* Check if any of the first 32 attributes are being encoded */
        if (ae & 0xffffffff00000000) {
            /*
             * Redzone check is done at the end of this section.
             * This particular section will encode a maximum of
             * 18 * BYTES_PER_XDR_UNIT of data
             */
            if (ae &
                (FATTR4_SUPPORTED_ATTRS_MASK |
                FATTR4_TYPE_MASK |
                FATTR4_FH_EXPIRE_TYPE_MASK |
                FATTR4_CHANGE_MASK |
                FATTR4_SIZE_MASK |
                FATTR4_LINK_SUPPORT_MASK |
                FATTR4_SYMLINK_SUPPORT_MASK |
                FATTR4_NAMED_ATTR_MASK |
                FATTR4_FSID_MASK |
                FATTR4_UNIQUE_HANDLES_MASK |
                FATTR4_LEASE_TIME_MASK |
                FATTR4_RDATTR_ERROR_MASK)) {

                if (ae & FATTR4_SUPPORTED_ATTRS_MASK) {
                    IXDR_PUT_INT32(ptr, 2);
                    IXDR_PUT_HYPER(ptr,
                            rfs4_supported_attrs);
                }
                if (ae & FATTR4_TYPE_MASK) {
                    uint_t ftype = vt_to_nf4[va.va_type];
                    if (dvp->v_flag & V_XATTRDIR) {
                        if (va.va_type == VDIR)
                            ftype = NF4ATTRDIR;
                        else
                            ftype = NF4NAMEDATTR;
                    }
                    IXDR_PUT_U_INT32(ptr, ftype);
                }
                if (ae & FATTR4_FH_EXPIRE_TYPE_MASK) {
                    uint_t expire_type = FH4_PERSISTENT;
                    IXDR_PUT_U_INT32(ptr, expire_type);
                }
                if (ae & FATTR4_CHANGE_MASK) {
                    u_longlong_t change;
                    NFS4_SET_FATTR4_CHANGE(change,
                            va.va_ctime);
                    IXDR_PUT_HYPER(ptr, change);
                }
                if (ae & FATTR4_SIZE_MASK) {
                    u_longlong_t size = va.va_size;
                    IXDR_PUT_HYPER(ptr, size);
                }
                if (ae & FATTR4_LINK_SUPPORT_MASK) {
                    IXDR_PUT_U_INT32(ptr, true);
                }
                if (ae & FATTR4_SYMLINK_SUPPORT_MASK) {
                    IXDR_PUT_U_INT32(ptr, true);
                }
                if (ae & FATTR4_NAMED_ATTR_MASK) {
                    uint_t isit;
                    pc_val = FALSE;

                    if (!(vp->v_vfsp->vfs_flag &
                        VFS_XATTR)) {
                        isit = FALSE;
                    } else {
                        (void) VOP_PATHCONF(vp,
                            _PC_XATTR_EXISTS,
                            &pc_val, cs->cr, NULL);
                    }
                    isit = (pc_val ? TRUE : FALSE);
                    IXDR_PUT_U_INT32(ptr, isit);
                }
                if (ae & FATTR4_FSID_MASK) {
                    u_longlong_t major, minor;
                    struct exportinfo *exi;

                    exi = newexi ? newexi : cs->exi;
                    if (exi->exi_volatile_dev) {
                        int *pmaj = (int *)&major;

                        pmaj[0] = exi->exi_fsid.val[0];
                        pmaj[1] = exi->exi_fsid.val[1];
                        minor = 0;
                    } else {
                        major = getmajor(va.va_fsid);
                        minor = getminor(va.va_fsid);
                    }
                    IXDR_PUT_HYPER(ptr, major);
                    IXDR_PUT_HYPER(ptr, minor);
                }
                if (ae & FATTR4_UNIQUE_HANDLES_MASK) {
                    IXDR_PUT_U_INT32(ptr, false);
                }
                if (ae & FATTR4_LEASE_TIME_MASK) {
                    uint_t lt = rfs4_lease_time;
                    IXDR_PUT_U_INT32(ptr, lt);
                }
                if (ae & FATTR4_RDATTR_ERROR_MASK) {
                    rddirattr_error =
                        (rddirattr_error == 0 ?
                        0 : puterrno4(rddirattr_error));
                    IXDR_PUT_U_INT32(ptr, rddirattr_error);
                }

                /* Check the redzone boundary */
                if (ptr > ptr_redzone) {
                    if (nents || IS_MIN_ATTR_MASK(ar)) {
                        no_space = TRUE;
                        continue;
                    }
                    MINIMIZE_ATTR_MASK(ar);
                    ae = ar;
                    ptr = lastentry_ptr;
                    goto reencode_attrs;
                }
            }
            /*
             * Redzone check is done at the end of this section.
             * This particular section will encode a maximum of
             * 4 * BYTES_PER_XDR_UNIT of data.
             * NOTE: that if ACLs are supported that the
             * redzone calculations will need to change.
             */
            if (ae &
                (FATTR4_ACL_MASK |
                FATTR4_ACLSUPPORT_MASK |
                FATTR4_ARCHIVE_MASK |
                FATTR4_CANSETTIME_MASK |
                FATTR4_CASE_INSENSITIVE_MASK |
                FATTR4_CASE_PRESERVING_MASK |
                FATTR4_CHOWN_RESTRICTED_MASK)) {

                if (ae & FATTR4_ACL_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_ACLSUPPORT_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_ARCHIVE_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_CANSETTIME_MASK) {
                    IXDR_PUT_U_INT32(ptr, true);
                }
                if (ae & FATTR4_CASE_INSENSITIVE_MASK) {
                    IXDR_PUT_U_INT32(ptr, false);
                }
                if (ae & FATTR4_CASE_PRESERVING_MASK) {
                    IXDR_PUT_U_INT32(ptr, true);
                }
                if (ae & FATTR4_CHOWN_RESTRICTED_MASK) {
                    uint_t isit;
                    pc_val = FALSE;
                    (void) VOP_PATHCONF(vp,
                            _PC_CHOWN_RESTRICTED,
                            &pc_val, cs->cr, NULL);
                    isit = (pc_val ? TRUE : FALSE);
                    IXDR_PUT_U_INT32(ptr, isit);
                }
                /* Check the redzone boundary */
                if (ptr > ptr_redzone) {
                    if (nents || IS_MIN_ATTR_MASK(ar)) {
                        no_space = TRUE;
                        continue;
                    }
                    MINIMIZE_ATTR_MASK(ar);
                    ae = ar;
                    ptr = lastentry_ptr;
                    goto reencode_attrs;
                }
            }
            /*
             * Redzone check is done before the filehandle
             * is encoded.
             */
            if (ae &
                (FATTR4_FILEHANDLE_MASK |
                FATTR4_FILEID_MASK)) {

                if (ae & FATTR4_FILEHANDLE_MASK) {
                    struct {
                        uint_t len;
                        char *val;
                        char fh[NFS_FH4_LEN];
                    } fh;
                    fh.len = 0;
                    fh.val = fh.fh;
                    (void) makefh4((nfs_fh4 *)&fh, vp,
                        (newexi ? newexi : cs->exi));

                    if (!xdr_inline_encode_nfs_fh4(
                        &ptr, ptr_redzone,
                        (nfs_fh4_fmt_t *)fh.val)) {
                        if (nents ||
                            IS_MIN_ATTR_MASK(ar)) {
                            no_space = TRUE;
                            continue;
                        }
                        MINIMIZE_ATTR_MASK(ar);
                        ae = ar;
                        ptr = lastentry_ptr;
                        goto reencode_attrs;
                    }
                }
                if (ae & FATTR4_FILEID_MASK) {
                    IXDR_PUT_HYPER(ptr, va.va_nodeid);
                }
                /* Check the redzone boundary */
                if (ptr > ptr_redzone) {
                    if (nents || IS_MIN_ATTR_MASK(ar)) {
                        no_space = TRUE;
                        continue;
                    }
                    MINIMIZE_ATTR_MASK(ar);
                    ae = ar;
                    ptr = lastentry_ptr;
                    goto reencode_attrs;
                }
            }
            /*
             * Redzone check is done at the end of this section.
             * This particular section will encode a maximum of
             * 15 * BYTES_PER_XDR_UNIT of data.
             */
            if (ae &
                (FATTR4_FILES_AVAIL_MASK |
                FATTR4_FILES_FREE_MASK |
                FATTR4_FILES_TOTAL_MASK |
                FATTR4_FS_LOCATIONS_MASK |
                FATTR4_HIDDEN_MASK |
                FATTR4_HOMOGENEOUS_MASK |
                FATTR4_MAXFILESIZE_MASK |
                FATTR4_MAXLINK_MASK |
                FATTR4_MAXNAME_MASK |
                FATTR4_MAXREAD_MASK |
                FATTR4_MAXWRITE_MASK)) {

                if (ae & FATTR4_FILES_AVAIL_MASK) {
                    IXDR_PUT_HYPER(ptr, sbe.fa);
                }
                if (ae & FATTR4_FILES_FREE_MASK) {
                    IXDR_PUT_HYPER(ptr, sbe.ff);
                }
                if (ae & FATTR4_FILES_TOTAL_MASK) {
                    IXDR_PUT_HYPER(ptr, sbe.ft);
                }
                if (ae & FATTR4_FS_LOCATIONS_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_HIDDEN_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_HOMOGENEOUS_MASK) {
                    IXDR_PUT_U_INT32(ptr, true);
                }
                if (ae & FATTR4_MAXFILESIZE_MASK) {
                    IXDR_PUT_HYPER(ptr, pce.maxfilesize);
                }
                if (ae & FATTR4_MAXLINK_MASK) {
                    IXDR_PUT_U_INT32(ptr, pce.maxlink);
                }
                if (ae & FATTR4_MAXNAME_MASK) {
                    IXDR_PUT_U_INT32(ptr, pce.maxname);
                }
                if (ae & FATTR4_MAXREAD_MASK) {
                    IXDR_PUT_HYPER(ptr, maxread);
                }
                if (ae & FATTR4_MAXWRITE_MASK) {
                    IXDR_PUT_HYPER(ptr, maxwrite);
                }
                /* Check the redzone boundary */
                if (ptr > ptr_redzone) {
                    if (nents || IS_MIN_ATTR_MASK(ar)) {
                        no_space = TRUE;
                        continue;
                    }
                    MINIMIZE_ATTR_MASK(ar);
                    ae = ar;
                    ptr = lastentry_ptr;
                    goto reencode_attrs;
                }
            }
        }
        if (ae & 0x00000000ffffffff) {
            /*
             * Redzone check is done at the end of this section.
             * This particular section will encode a maximum of
             * 3 * BYTES_PER_XDR_UNIT of data.
             */
            if (ae &
                (FATTR4_MIMETYPE_MASK |
                FATTR4_MODE_MASK |
                FATTR4_NO_TRUNC_MASK |
                FATTR4_NUMLINKS_MASK)) {

                if (ae & FATTR4_MIMETYPE_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_MODE_MASK) {
                    uint_t m = va.va_mode;
                    IXDR_PUT_U_INT32(ptr, m);
                }
                if (ae & FATTR4_NO_TRUNC_MASK) {
                    IXDR_PUT_U_INT32(ptr, true);
                }
                if (ae & FATTR4_NUMLINKS_MASK) {
                    IXDR_PUT_U_INT32(ptr, va.va_nlink);
                }
                /* Check the redzone boundary */
                if (ptr > ptr_redzone) {
                    if (nents || IS_MIN_ATTR_MASK(ar)) {
                        no_space = TRUE;
                        continue;
                    }
                    MINIMIZE_ATTR_MASK(ar);
                    ae = ar;
                    ptr = lastentry_ptr;
                    goto reencode_attrs;
                }
            }
            /*
             * Redzone check is done before the encoding of the
             * owner string since the length is indeterminate.
             */
            if (ae & FATTR4_OWNER_MASK) {
                if (!lu_set) {
                    owner_error = nfs_idmap_uid_str(va.va_uid,
                                &owner, TRUE);
                    if (!owner_error) {
                        lu_set = TRUE;
                        lastuid = va.va_uid;
                    }
                } else {
                    if (va.va_uid != lastuid) {
                    if (owner.utf8string_len != 0) {
                        kmem_free(owner.utf8string_val,
                        owner.utf8string_len);
                        owner.utf8string_len = 0;
                        owner.utf8string_val = NULL;
                    }
                    owner_error = nfs_idmap_uid_str(
                            va.va_uid,
                            &owner, TRUE);
                    if (!owner_error) {
                        lastuid = va.va_uid;
                    } else {
                        lu_set = FALSE;
                    }
                    }
                }
                if (!owner_error) {
                    if ((ptr +
                        (owner.utf8string_len /
                        BYTES_PER_XDR_UNIT)
                        + 2) > ptr_redzone) {
                        if (nents ||
                            IS_MIN_ATTR_MASK(ar)) {
                            no_space = TRUE;
                            continue;
                        }
                        MINIMIZE_ATTR_MASK(ar);
                        ae = ar;
                        ptr = lastentry_ptr;
                        goto reencode_attrs;
                    }
                    /* encode the LENGTH of owner string */
                    IXDR_PUT_U_INT32(ptr,
                            owner.utf8string_len);
                    /* encode the RNDUP FILL first */
                    rndup = RNDUP(owner.utf8string_len) /
                        BYTES_PER_XDR_UNIT;
                    ptr[rndup - 1] = 0;
                    /* encode the OWNER */
                    bcopy(owner.utf8string_val, ptr,
                        owner.utf8string_len);
                    ptr += rndup;
                }
            }
            /*
             * Redzone check is done before the encoding of the
             * group string since the length is indeterminate.
             */
            if (ae & FATTR4_OWNER_GROUP_MASK) {
                if (!lg_set) {
                    group_error =
                        nfs_idmap_gid_str(va.va_gid,
                            &group, TRUE);
                    if (!group_error) {
                        lg_set = TRUE;
                        lastgid = va.va_gid;
                    }
                } else {
                    if (va.va_gid != lastgid) {
                    if (group.utf8string_len != 0) {
                        kmem_free(group.utf8string_val,
                        group.utf8string_len);
                        group.utf8string_len = 0;
                        group.utf8string_val = NULL;
                    }
                    group_error =
                        nfs_idmap_gid_str(va.va_gid,
                                &group, TRUE);
                    if (!group_error)
                        lastgid = va.va_gid;
                    else
                        lg_set = FALSE;
                    }
                }
                if (!group_error) {
                    if ((ptr +
                        (group.utf8string_len /
                        BYTES_PER_XDR_UNIT)
                        + 2) > ptr_redzone) {
                        if (nents ||
                            IS_MIN_ATTR_MASK(ar)) {
                            no_space = TRUE;
                            continue;
                        }
                        MINIMIZE_ATTR_MASK(ar);
                        ae = ar;
                        ptr = lastentry_ptr;
                        goto reencode_attrs;
                    }
                    /* encode the LENGTH of owner string */
                    IXDR_PUT_U_INT32(ptr,
                            group.utf8string_len);
                    /* encode the RNDUP FILL first */
                    rndup = RNDUP(group.utf8string_len) /
                        BYTES_PER_XDR_UNIT;
                    ptr[rndup - 1] = 0;
                    /* encode the OWNER */
                    bcopy(group.utf8string_val, ptr,
                        group.utf8string_len);
                    ptr += rndup;
                }
            }
            if (ae &
                (FATTR4_QUOTA_AVAIL_HARD_MASK |
                FATTR4_QUOTA_AVAIL_SOFT_MASK |
                FATTR4_QUOTA_USED_MASK)) {
                if (ae & FATTR4_QUOTA_AVAIL_HARD_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_QUOTA_AVAIL_SOFT_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_QUOTA_USED_MASK) {
                    ASSERT(0);
                }
            }
            /*
             * Redzone check is done at the end of this section.
             * This particular section will encode a maximum of
             * 10 * BYTES_PER_XDR_UNIT of data.
             */
            if (ae &
                (FATTR4_RAWDEV_MASK |
                FATTR4_SPACE_AVAIL_MASK |
                FATTR4_SPACE_FREE_MASK |
                FATTR4_SPACE_TOTAL_MASK |
                FATTR4_SPACE_USED_MASK |
                FATTR4_SYSTEM_MASK)) {

                if (ae & FATTR4_RAWDEV_MASK) {
                    fattr4_rawdev rd;
                    rd.specdata1 =
                        (uint32)getmajor(va.va_rdev);
                    rd.specdata2 =
                        (uint32)getminor(va.va_rdev);
                    IXDR_PUT_U_INT32(ptr, rd.specdata1);
                    IXDR_PUT_U_INT32(ptr, rd.specdata2);
                }
                if (ae & FATTR4_SPACE_AVAIL_MASK) {
                    IXDR_PUT_HYPER(ptr, sbe.space_avail);
                }
                if (ae & FATTR4_SPACE_FREE_MASK) {
                    IXDR_PUT_HYPER(ptr, sbe.space_free);
                }
                if (ae & FATTR4_SPACE_TOTAL_MASK) {
                    IXDR_PUT_HYPER(ptr, sbe.space_total);
                }
                if (ae & FATTR4_SPACE_USED_MASK) {
                    u_longlong_t su;
                    su = (fattr4_space_used) DEV_BSIZE *
                        (fattr4_space_used) va.va_nblocks;
                    IXDR_PUT_HYPER(ptr, su);
                }
                if (ae & FATTR4_SYSTEM_MASK) {
                    ASSERT(0);
                }
                /* Check the redzone boundary */
                if (ptr > ptr_redzone) {
                    if (nents || IS_MIN_ATTR_MASK(ar)) {
                        no_space = TRUE;
                        continue;
                    }
                    MINIMIZE_ATTR_MASK(ar);
                    ae = ar;
                    ptr = lastentry_ptr;
                    goto reencode_attrs;
                }
            }
            /*
             * Redzone check is done at the end of this section.
             * This particular section will encode a maximum of
             * 14 * BYTES_PER_XDR_UNIT of data.
             */
            if (ae &
                (FATTR4_TIME_ACCESS_MASK |
                FATTR4_TIME_ACCESS_SET_MASK |
                FATTR4_TIME_BACKUP_MASK |
                FATTR4_TIME_CREATE_MASK |
                FATTR4_TIME_DELTA_MASK |
                FATTR4_TIME_METADATA_MASK |
                FATTR4_TIME_MODIFY_MASK |
                FATTR4_TIME_MODIFY_SET_MASK |
                FATTR4_MOUNTED_ON_FILEID_MASK)) {

                if (ae & FATTR4_TIME_ACCESS_MASK) {
                    u_longlong_t sec =
                        (u_longlong_t)va.va_atime.tv_sec;
                    uint_t nsec =
                        (uint_t)va.va_atime.tv_nsec;
                    IXDR_PUT_HYPER(ptr, sec);
                    IXDR_PUT_INT32(ptr, nsec);
                }
                if (ae & FATTR4_TIME_ACCESS_SET_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_TIME_BACKUP_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_TIME_CREATE_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_TIME_DELTA_MASK) {
                    u_longlong_t sec = 0;
                    uint_t nsec = 1000;
                    IXDR_PUT_HYPER(ptr, sec);
                    IXDR_PUT_INT32(ptr, nsec);
                }
                if (ae & FATTR4_TIME_METADATA_MASK) {
                    u_longlong_t sec =
                        (u_longlong_t)va.va_ctime.tv_sec;
                    uint_t nsec =
                        (uint_t)va.va_ctime.tv_nsec;
                    IXDR_PUT_HYPER(ptr, sec);
                    IXDR_PUT_INT32(ptr, nsec);
                }
                if (ae & FATTR4_TIME_MODIFY_MASK) {
                    u_longlong_t sec =
                        (u_longlong_t)va.va_mtime.tv_sec;
                    uint_t nsec =
                        (uint_t)va.va_mtime.tv_nsec;
                    IXDR_PUT_HYPER(ptr, sec);
                    IXDR_PUT_INT32(ptr, nsec);
                }
                if (ae & FATTR4_TIME_MODIFY_SET_MASK) {
                    ASSERT(0);
                }
                if (ae & FATTR4_MOUNTED_ON_FILEID_MASK) {
                    IXDR_PUT_HYPER(ptr, dp->d_ino);
                }
                /* Check the redzone boundary */
                if (ptr > ptr_redzone) {
                    if (nents || IS_MIN_ATTR_MASK(ar)) {
                        no_space = TRUE;
                        continue;
                    }
                    MINIMIZE_ATTR_MASK(ar);
                    ae = ar;
                    ptr = lastentry_ptr;
                    goto reencode_attrs;
                }
            }
        }

        /* Reset to directory's vfs info when encoding complete */
        if (vfs_different) {
            dsbe = sbe;
            dpce = pce;
            vfs_different = 0;
        }

        /* "go back" and encode the attributes' length */
        attr_length =
            (char *)ptr -
            (char *)attr_offset_ptr -
            BYTES_PER_XDR_UNIT;
        IXDR_PUT_U_INT32(attr_offset_ptr, attr_length);

        /*
         * If there was trouble obtaining a mapping for either
         * the owner or group attributes, then remove them from
         * bitmap4 for this entry and reset the bitmap value
         * in the data stream.
         */
        if (owner_error || group_error) {
            if (owner_error)
                ae &= ~FATTR4_OWNER_MASK;
            if (group_error)
                ae &= ~FATTR4_OWNER_GROUP_MASK;
            IXDR_PUT_HYPER(attrmask_ptr, ae);
        }

        /* END OF ATTRIBUTE ENCODING */

        lastentry_ptr = ptr;
        nents++;
        rddir_next_offset = dp->d_off;
    }

    /*
     * Check for the case that another VOP_READDIR() has to be done.
     * - no space encoding error
     * - no entry successfully encoded
     * - still more directory to read
     */
    if (!no_space && nents == 0 && !iseofdir)
        goto readagain;

    *cs->statusp = resp->status = NFS4_OK;

    /*
     * If no_space is set then we terminated prematurely,
     * rewind to the last entry and this can never be EOF.
     */
    if (no_space) {
        ptr = lastentry_ptr;
        eof = FALSE; /* ended encoded prematurely */
    } else {
        eof = (iseofdir ? TRUE : FALSE);
    }

    /*
     * If we have entries, always return them, otherwise only error
     * if we ran out of space.
     */
    if (nents || !no_space) {
        ASSERT(ptr != NULL);
        /* encode the BOOLEAN marking no further entries */
        IXDR_PUT_U_INT32(ptr, false);
        /* encode the BOOLEAN signifying end of directory */
        IXDR_PUT_U_INT32(ptr, eof);

        resp->data_len = (char *)ptr - (char *)beginning_ptr;
        resp->mblk->b_wptr += resp->data_len;
    } else {
        freeb(mp);
        resp->mblk = NULL;
        resp->data_len = 0;
        *cs->statusp = resp->status = NFS4ERR_TOOSMALL;
    }

    kmem_free((caddr_t)rddir_data, rddir_data_len);
    if (vp)
        VN_RELE(vp);
    if (owner.utf8string_len != 0)
        kmem_free(owner.utf8string_val, owner.utf8string_len);
    if (group.utf8string_len != 0)
        kmem_free(group.utf8string_val, group.utf8string_len);

out:
    DTRACE_NFSV4_2(op__readdir__done, struct compound_state *, cs,
        READDIR4res *, resp);
}