/*
 * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysmacros.h>
#include <sys/cmn_err.h>
#include <sys/kmem.h>
#include <sys/thread.h>
#include <sys/file.h>
#include <sys/fcntl.h>
#include <sys/vfs.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_dir.h>
#include <sys/zfs_acl.h>
#include <sys/zfs_fuid.h>
#include <sys/spa.h>
#include <sys/zil.h>
#include <sys/byteorder.h>
#include <sys/stat.h>
#include <sys/mode.h>
#include <sys/acl.h>
#include <sys/atomic.h>
#include <sys/cred.h>

/*
 * Functions to replay ZFS intent log (ZIL) records
 * The functions are called through a function vector (zfs_replay_vector)
 * which is indexed by the transaction type.
 */

static void
zfs_init_vattr(vattr_t *vap, uint64_t mask, uint64_t mode,
    uint64_t uid, uint64_t gid, uint64_t rdev, uint64_t nodeid)
{
        bzero(vap, sizeof (*vap));
        vap->va_mask = (uint_t)mask;
        vap->va_type = IFTOVT(mode);
        vap->va_mode = mode & MODEMASK;
        vap->va_uid = (uid_t)(IS_EPHEMERAL(uid)) ? -1 : uid;
        vap->va_gid = (gid_t)(IS_EPHEMERAL(gid)) ? -1 : gid;
        vap->va_rdev = zfs_cmpldev(rdev);
        vap->va_nodeid = nodeid;
}

/* ARGSUSED */
static int
zfs_replay_error(void *arg1, void *arg2, boolean_t byteswap)
{
        return (SET_ERROR(ENOTSUP));
}

static void
zfs_replay_xvattr(lr_attr_t *lrattr, xvattr_t *xvap)
{
        xoptattr_t *xoap = NULL;
        uint64_t *attrs;
        uint64_t *crtime;
        uint32_t *bitmap;
        void *scanstamp;
        int i;

        xvap->xva_vattr.va_mask |= AT_XVATTR;
        if ((xoap = xva_getxoptattr(xvap)) == NULL) {
                xvap->xva_vattr.va_mask &= ~AT_XVATTR; /* shouldn't happen */
                return;
        }

        ASSERT(lrattr->lr_attr_masksize == xvap->xva_mapsize);

        bitmap = &lrattr->lr_attr_bitmap;
        for (i = 0; i != lrattr->lr_attr_masksize; i++, bitmap++)
                xvap->xva_reqattrmap[i] = *bitmap;

        attrs = (uint64_t *)(lrattr + lrattr->lr_attr_masksize - 1);
        crtime = attrs + 1;
        scanstamp = (caddr_t)(crtime + 2);

        if (XVA_ISSET_REQ(xvap, XAT_HIDDEN))
                xoap->xoa_hidden = ((*attrs & XAT0_HIDDEN) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_SYSTEM))
                xoap->xoa_system = ((*attrs & XAT0_SYSTEM) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE))
                xoap->xoa_archive = ((*attrs & XAT0_ARCHIVE) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_READONLY))
                xoap->xoa_readonly = ((*attrs & XAT0_READONLY) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE))
                xoap->xoa_immutable = ((*attrs & XAT0_IMMUTABLE) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK))
                xoap->xoa_nounlink = ((*attrs & XAT0_NOUNLINK) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY))
                xoap->xoa_appendonly = ((*attrs & XAT0_APPENDONLY) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_NODUMP))
                xoap->xoa_nodump = ((*attrs & XAT0_NODUMP) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_OPAQUE))
                xoap->xoa_opaque = ((*attrs & XAT0_OPAQUE) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED))
                xoap->xoa_av_modified = ((*attrs & XAT0_AV_MODIFIED) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED))
                xoap->xoa_av_quarantined =
                    ((*attrs & XAT0_AV_QUARANTINED) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_CREATETIME))
                ZFS_TIME_DECODE(&xoap->xoa_createtime, crtime);
        if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
                ASSERT(!XVA_ISSET_REQ(xvap, XAT_PROJID));

                bcopy(scanstamp, xoap->xoa_av_scanstamp, AV_SCANSTAMP_SZ);
        } else if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
                /*
                 * XAT_PROJID and XAT_AV_SCANSTAMP will never be valid
                 * at the same time, so we can share the same space.
                 */
                bcopy(scanstamp, &xoap->xoa_projid, sizeof (uint64_t));
        }
        if (XVA_ISSET_REQ(xvap, XAT_REPARSE))
                xoap->xoa_reparse = ((*attrs & XAT0_REPARSE) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_OFFLINE))
                xoap->xoa_offline = ((*attrs & XAT0_OFFLINE) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_SPARSE))
                xoap->xoa_sparse = ((*attrs & XAT0_SPARSE) != 0);
        if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT))
                xoap->xoa_projinherit = ((*attrs & XAT0_PROJINHERIT) != 0);
}

static int
zfs_replay_domain_cnt(uint64_t uid, uint64_t gid)
{
        uint64_t uid_idx;
        uint64_t gid_idx;
        int domcnt = 0;

        uid_idx = FUID_INDEX(uid);
        gid_idx = FUID_INDEX(gid);
        if (uid_idx)
                domcnt++;
        if (gid_idx > 0 && gid_idx != uid_idx)
                domcnt++;

        return (domcnt);
}

static void *
zfs_replay_fuid_domain_common(zfs_fuid_info_t *fuid_infop, void *start,
    int domcnt)
{
        int i;

        for (i = 0; i != domcnt; i++) {
                fuid_infop->z_domain_table[i] = start;
                start = (caddr_t)start + strlen(start) + 1;
        }

        return (start);
}

/*
 * Set the uid/gid in the fuid_info structure.
 */
static void
zfs_replay_fuid_ugid(zfs_fuid_info_t *fuid_infop, uint64_t uid, uint64_t gid)
{
        /*
         * If owner or group are log specific FUIDs then slurp up
         * domain information and build zfs_fuid_info_t
         */
        if (IS_EPHEMERAL(uid))
                fuid_infop->z_fuid_owner = uid;

        if (IS_EPHEMERAL(gid))
                fuid_infop->z_fuid_group = gid;
}

/*
 * Load fuid domains into fuid_info_t
 */
static zfs_fuid_info_t *
zfs_replay_fuid_domain(void *buf, void **end, uint64_t uid, uint64_t gid)
{
        int domcnt;

        zfs_fuid_info_t *fuid_infop;

        fuid_infop = zfs_fuid_info_alloc();

        domcnt = zfs_replay_domain_cnt(uid, gid);

        if (domcnt == 0)
                return (fuid_infop);

        fuid_infop->z_domain_table =
            kmem_zalloc(domcnt * sizeof (char **), KM_SLEEP);

        zfs_replay_fuid_ugid(fuid_infop, uid, gid);

        fuid_infop->z_domain_cnt = domcnt;
        *end = zfs_replay_fuid_domain_common(fuid_infop, buf, domcnt);
        return (fuid_infop);
}

/*
 * load zfs_fuid_t's and fuid_domains into fuid_info_t
 */
static zfs_fuid_info_t *
zfs_replay_fuids(void *start, void **end, int idcnt, int domcnt, uint64_t uid,
    uint64_t gid)
{
        uint64_t *log_fuid = (uint64_t *)start;
        zfs_fuid_info_t *fuid_infop;
        int i;

        fuid_infop = zfs_fuid_info_alloc();
        fuid_infop->z_domain_cnt = domcnt;

        fuid_infop->z_domain_table =
            kmem_zalloc(domcnt * sizeof (char **), KM_SLEEP);

        for (i = 0; i != idcnt; i++) {
                zfs_fuid_t *zfuid;

                zfuid = kmem_alloc(sizeof (zfs_fuid_t), KM_SLEEP);
                zfuid->z_logfuid = *log_fuid;
                zfuid->z_id = -1;
                zfuid->z_domidx = 0;
                list_insert_tail(&fuid_infop->z_fuids, zfuid);
                log_fuid++;
        }

        zfs_replay_fuid_ugid(fuid_infop, uid, gid);

        *end = zfs_replay_fuid_domain_common(fuid_infop, log_fuid, domcnt);
        return (fuid_infop);
}

static void
zfs_replay_swap_attrs(lr_attr_t *lrattr)
{
        /* swap the lr_attr structure */
        byteswap_uint32_array(lrattr, sizeof (*lrattr));
        /* swap the bitmap */
        byteswap_uint32_array(lrattr + 1, (lrattr->lr_attr_masksize - 1) *
            sizeof (uint32_t));
        /* swap the attributes, create time + 64 bit word for attributes */
        byteswap_uint64_array((caddr_t)(lrattr + 1) + (sizeof (uint32_t) *
            (lrattr->lr_attr_masksize - 1)), 3 * sizeof (uint64_t));
}

/*
 * Replay file create with optional ACL, xvattr information as well
 * as option FUID information.
 */
static int
zfs_replay_create_acl(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_acl_create_t *lracl = arg2;
        char *name = NULL;              /* location determined later */
        lr_create_t *lr = (lr_create_t *)lracl;
        znode_t *dzp;
        vnode_t *vp = NULL;
        xvattr_t xva;
        int vflg = 0;
        vsecattr_t vsec = { 0 };
        lr_attr_t *lrattr;
        void *aclstart;
        void *fuidstart;
        size_t xvatlen = 0;
        uint64_t txtype;
        uint64_t objid;
        uint64_t dnodesize;
        int error;

        txtype = (lr->lr_common.lrc_txtype & ~TX_CI);
        if (byteswap) {
                byteswap_uint64_array(lracl, sizeof (*lracl));
                if (txtype == TX_CREATE_ACL_ATTR ||
                    txtype == TX_MKDIR_ACL_ATTR) {
                        lrattr = (lr_attr_t *)(caddr_t)(lracl + 1);
                        zfs_replay_swap_attrs(lrattr);
                        xvatlen = ZIL_XVAT_SIZE(lrattr->lr_attr_masksize);
                }

                aclstart = (caddr_t)(lracl + 1) + xvatlen;
                zfs_ace_byteswap(aclstart, lracl->lr_acl_bytes, B_FALSE);
                /* swap fuids */
                if (lracl->lr_fuidcnt) {
                        byteswap_uint64_array((caddr_t)aclstart +
                            ZIL_ACE_LENGTH(lracl->lr_acl_bytes),
                            lracl->lr_fuidcnt * sizeof (uint64_t));
                }
        }

        if ((error = zfs_zget(zfsvfs, lr->lr_doid, &dzp)) != 0)
                return (error);

        objid = LR_FOID_GET_OBJ(lr->lr_foid);
        dnodesize = LR_FOID_GET_SLOTS(lr->lr_foid) << DNODE_SHIFT;

        xva_init(&xva);
        zfs_init_vattr(&xva.xva_vattr, AT_TYPE | AT_MODE | AT_UID | AT_GID,
            lr->lr_mode, lr->lr_uid, lr->lr_gid, lr->lr_rdev, objid);

        /*
         * All forms of zfs create (create, mkdir, mkxattrdir, symlink)
         * eventually end up in zfs_mknode(), which assigns the object's
         * creation time, generation number, and dnode size. The generic
         * zfs_create() has no concept of these attributes, so we smuggle
         * the values inside the vattr's otherwise unused va_ctime,
         * va_nblocks, and va_fsid fields.
         */
        ZFS_TIME_DECODE(&xva.xva_vattr.va_ctime, lr->lr_crtime);
        xva.xva_vattr.va_nblocks = lr->lr_gen;
        xva.xva_vattr.va_fsid = dnodesize;

        error = dnode_try_claim(zfsvfs->z_os, objid, dnodesize >> DNODE_SHIFT);
        if (error)
                goto bail;

        if (lr->lr_common.lrc_txtype & TX_CI)
                vflg |= FIGNORECASE;
        switch (txtype) {
        case TX_CREATE_ACL:
                aclstart = (caddr_t)(lracl + 1);
                fuidstart = (caddr_t)aclstart +
                    ZIL_ACE_LENGTH(lracl->lr_acl_bytes);
                zfsvfs->z_fuid_replay = zfs_replay_fuids(fuidstart,
                    (void *)&name, lracl->lr_fuidcnt, lracl->lr_domcnt,
                    lr->lr_uid, lr->lr_gid);
                /*FALLTHROUGH*/
        case TX_CREATE_ACL_ATTR:
                if (name == NULL) {
                        lrattr = (lr_attr_t *)(caddr_t)(lracl + 1);
                        xvatlen = ZIL_XVAT_SIZE(lrattr->lr_attr_masksize);
                        xva.xva_vattr.va_mask |= AT_XVATTR;
                        zfs_replay_xvattr(lrattr, &xva);
                }
                vsec.vsa_mask = VSA_ACE | VSA_ACE_ACLFLAGS;
                vsec.vsa_aclentp = (caddr_t)(lracl + 1) + xvatlen;
                vsec.vsa_aclcnt = lracl->lr_aclcnt;
                vsec.vsa_aclentsz = lracl->lr_acl_bytes;
                vsec.vsa_aclflags = lracl->lr_acl_flags;
                if (zfsvfs->z_fuid_replay == NULL) {
                        fuidstart = (caddr_t)(lracl + 1) + xvatlen +
                            ZIL_ACE_LENGTH(lracl->lr_acl_bytes);
                        zfsvfs->z_fuid_replay =
                            zfs_replay_fuids(fuidstart,
                            (void *)&name, lracl->lr_fuidcnt, lracl->lr_domcnt,
                            lr->lr_uid, lr->lr_gid);
                }

                error = VOP_CREATE(ZTOV(dzp), name, &xva.xva_vattr,
                    0, 0, &vp, kcred, vflg, NULL, &vsec);
                break;
        case TX_MKDIR_ACL:
                aclstart = (caddr_t)(lracl + 1);
                fuidstart = (caddr_t)aclstart +
                    ZIL_ACE_LENGTH(lracl->lr_acl_bytes);
                zfsvfs->z_fuid_replay = zfs_replay_fuids(fuidstart,
                    (void *)&name, lracl->lr_fuidcnt, lracl->lr_domcnt,
                    lr->lr_uid, lr->lr_gid);
                /*FALLTHROUGH*/
        case TX_MKDIR_ACL_ATTR:
                if (name == NULL) {
                        lrattr = (lr_attr_t *)(caddr_t)(lracl + 1);
                        xvatlen = ZIL_XVAT_SIZE(lrattr->lr_attr_masksize);
                        zfs_replay_xvattr(lrattr, &xva);
                }
                vsec.vsa_mask = VSA_ACE | VSA_ACE_ACLFLAGS;
                vsec.vsa_aclentp = (caddr_t)(lracl + 1) + xvatlen;
                vsec.vsa_aclcnt = lracl->lr_aclcnt;
                vsec.vsa_aclentsz = lracl->lr_acl_bytes;
                vsec.vsa_aclflags = lracl->lr_acl_flags;
                if (zfsvfs->z_fuid_replay == NULL) {
                        fuidstart = (caddr_t)(lracl + 1) + xvatlen +
                            ZIL_ACE_LENGTH(lracl->lr_acl_bytes);
                        zfsvfs->z_fuid_replay =
                            zfs_replay_fuids(fuidstart,
                            (void *)&name, lracl->lr_fuidcnt, lracl->lr_domcnt,
                            lr->lr_uid, lr->lr_gid);
                }
                error = VOP_MKDIR(ZTOV(dzp), name, &xva.xva_vattr,
                    &vp, kcred, NULL, vflg, &vsec);
                break;
        default:
                error = SET_ERROR(ENOTSUP);
        }

bail:
        if (error == 0 && vp != NULL)
                VN_RELE(vp);

        VN_RELE(ZTOV(dzp));

        if (zfsvfs->z_fuid_replay)
                zfs_fuid_info_free(zfsvfs->z_fuid_replay);
        zfsvfs->z_fuid_replay = NULL;

        return (error);
}

static int
zfs_replay_create(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_create_t *lr = arg2;
        char *name = NULL;              /* location determined later */
        char *link;                     /* symlink content follows name */
        znode_t *dzp;
        vnode_t *vp = NULL;
        xvattr_t xva;
        int vflg = 0;
        size_t lrsize = sizeof (lr_create_t);
        lr_attr_t *lrattr;
        void *start;
        size_t xvatlen;
        uint64_t txtype;
        int error;

        txtype = (lr->lr_common.lrc_txtype & ~TX_CI);
        if (byteswap) {
                byteswap_uint64_array(lr, sizeof (*lr));
                if (txtype == TX_CREATE_ATTR || txtype == TX_MKDIR_ATTR)
                        zfs_replay_swap_attrs((lr_attr_t *)(lr + 1));
        }


        if ((error = zfs_zget(zfsvfs, lr->lr_doid, &dzp)) != 0)
                return (error);

        uint64_t objid = LR_FOID_GET_OBJ(lr->lr_foid);
        int dnodesize = LR_FOID_GET_SLOTS(lr->lr_foid) << DNODE_SHIFT;

        xva_init(&xva);
        zfs_init_vattr(&xva.xva_vattr, AT_TYPE | AT_MODE | AT_UID | AT_GID,
            lr->lr_mode, lr->lr_uid, lr->lr_gid, lr->lr_rdev, objid);

        /*
         * All forms of zfs create (create, mkdir, mkxattrdir, symlink)
         * eventually end up in zfs_mknode(), which assigns the object's
         * creation time, generation number, and dnode slot count. The
         * generic zfs_create() has no concept of these attributes, so
         * we smuggle the values inside the vattr's otherwise unused
         * va_ctime, va_nblocks and va_fsid fields.
         */
        ZFS_TIME_DECODE(&xva.xva_vattr.va_ctime, lr->lr_crtime);
        xva.xva_vattr.va_nblocks = lr->lr_gen;
        xva.xva_vattr.va_fsid = dnodesize;

        error = dnode_try_claim(zfsvfs->z_os, objid, dnodesize >> DNODE_SHIFT);
        if (error)
                goto out;

        if (lr->lr_common.lrc_txtype & TX_CI)
                vflg |= FIGNORECASE;

        /*
         * Symlinks don't have fuid info, and CIFS never creates
         * symlinks.
         *
         * The _ATTR versions will grab the fuid info in their subcases.
         */
        if ((int)lr->lr_common.lrc_txtype != TX_SYMLINK &&
            (int)lr->lr_common.lrc_txtype != TX_MKDIR_ATTR &&
            (int)lr->lr_common.lrc_txtype != TX_CREATE_ATTR) {
                start = (lr + 1);
                zfsvfs->z_fuid_replay =
                    zfs_replay_fuid_domain(start, &start,
                    lr->lr_uid, lr->lr_gid);
        }

        switch (txtype) {
        case TX_CREATE_ATTR:
                lrattr = (lr_attr_t *)(caddr_t)(lr + 1);
                xvatlen = ZIL_XVAT_SIZE(lrattr->lr_attr_masksize);
                zfs_replay_xvattr((lr_attr_t *)((caddr_t)lr + lrsize), &xva);
                start = (caddr_t)(lr + 1) + xvatlen;
                zfsvfs->z_fuid_replay =
                    zfs_replay_fuid_domain(start, &start,
                    lr->lr_uid, lr->lr_gid);
                name = (char *)start;

                /*FALLTHROUGH*/
        case TX_CREATE:
                if (name == NULL)
                        name = (char *)start;

                error = VOP_CREATE(ZTOV(dzp), name, &xva.xva_vattr,
                    0, 0, &vp, kcred, vflg, NULL, NULL);
                break;
        case TX_MKDIR_ATTR:
                lrattr = (lr_attr_t *)(caddr_t)(lr + 1);
                xvatlen = ZIL_XVAT_SIZE(lrattr->lr_attr_masksize);
                zfs_replay_xvattr((lr_attr_t *)((caddr_t)lr + lrsize), &xva);
                start = (caddr_t)(lr + 1) + xvatlen;
                zfsvfs->z_fuid_replay =
                    zfs_replay_fuid_domain(start, &start,
                    lr->lr_uid, lr->lr_gid);
                name = (char *)start;

                /*FALLTHROUGH*/
        case TX_MKDIR:
                if (name == NULL)
                        name = (char *)(lr + 1);

                error = VOP_MKDIR(ZTOV(dzp), name, &xva.xva_vattr,
                    &vp, kcred, NULL, vflg, NULL);
                break;
        case TX_MKXATTR:
                error = zfs_make_xattrdir(dzp, &xva.xva_vattr, &vp, kcred);
                break;
        case TX_SYMLINK:
                name = (char *)(lr + 1);
                link = name + strlen(name) + 1;
                error = VOP_SYMLINK(ZTOV(dzp), name, &xva.xva_vattr,
                    link, kcred, NULL, vflg);
                break;
        default:
                error = SET_ERROR(ENOTSUP);
        }

out:
        if (error == 0 && vp != NULL)
                VN_RELE(vp);

        VN_RELE(ZTOV(dzp));

        if (zfsvfs->z_fuid_replay)
                zfs_fuid_info_free(zfsvfs->z_fuid_replay);
        zfsvfs->z_fuid_replay = NULL;
        return (error);
}

static int
zfs_replay_remove(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_remove_t *lr = arg2;
        char *name = (char *)(lr + 1);  /* name follows lr_remove_t */
        znode_t *dzp;
        int error;
        int vflg = 0;

        if (byteswap)
                byteswap_uint64_array(lr, sizeof (*lr));

        if ((error = zfs_zget(zfsvfs, lr->lr_doid, &dzp)) != 0)
                return (error);

        if (lr->lr_common.lrc_txtype & TX_CI)
                vflg |= FIGNORECASE;

        switch ((int)lr->lr_common.lrc_txtype) {
        case TX_REMOVE:
                error = VOP_REMOVE(ZTOV(dzp), name, kcred, NULL, vflg);
                break;
        case TX_RMDIR:
                error = VOP_RMDIR(ZTOV(dzp), name, NULL, kcred, NULL, vflg);
                break;
        default:
                error = SET_ERROR(ENOTSUP);
        }

        VN_RELE(ZTOV(dzp));

        return (error);
}

static int
zfs_replay_link(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_link_t *lr = arg2;
        char *name = (char *)(lr + 1);  /* name follows lr_link_t */
        znode_t *dzp, *zp;
        int error;
        int vflg = 0;

        if (byteswap)
                byteswap_uint64_array(lr, sizeof (*lr));

        if ((error = zfs_zget(zfsvfs, lr->lr_doid, &dzp)) != 0)
                return (error);

        if ((error = zfs_zget(zfsvfs, lr->lr_link_obj, &zp)) != 0) {
                VN_RELE(ZTOV(dzp));
                return (error);
        }

        if (lr->lr_common.lrc_txtype & TX_CI)
                vflg |= FIGNORECASE;

        error = VOP_LINK(ZTOV(dzp), ZTOV(zp), name, kcred, NULL, vflg);

        VN_RELE(ZTOV(zp));
        VN_RELE(ZTOV(dzp));

        return (error);
}

static int
zfs_replay_rename(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_rename_t *lr = arg2;
        char *sname = (char *)(lr + 1); /* sname and tname follow lr_rename_t */
        char *tname = sname + strlen(sname) + 1;
        znode_t *sdzp, *tdzp;
        int error;
        int vflg = 0;

        if (byteswap)
                byteswap_uint64_array(lr, sizeof (*lr));

        if ((error = zfs_zget(zfsvfs, lr->lr_sdoid, &sdzp)) != 0)
                return (error);

        if ((error = zfs_zget(zfsvfs, lr->lr_tdoid, &tdzp)) != 0) {
                VN_RELE(ZTOV(sdzp));
                return (error);
        }

        if (lr->lr_common.lrc_txtype & TX_CI)
                vflg |= FIGNORECASE;

        error = VOP_RENAME(ZTOV(sdzp), sname, ZTOV(tdzp), tname, kcred,
            NULL, vflg);

        VN_RELE(ZTOV(tdzp));
        VN_RELE(ZTOV(sdzp));

        return (error);
}

static int
zfs_replay_write(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_write_t *lr = arg2;
        char *data = (char *)(lr + 1);  /* data follows lr_write_t */
        znode_t *zp;
        int error;
        ssize_t resid;
        uint64_t eod, offset, length;

        if (byteswap)
                byteswap_uint64_array(lr, sizeof (*lr));

        if ((error = zfs_zget(zfsvfs, lr->lr_foid, &zp)) != 0) {
                /*
                 * As we can log writes out of order, it's possible the
                 * file has been removed. In this case just drop the write
                 * and return success.
                 */
                if (error == ENOENT)
                        error = 0;
                return (error);
        }

        offset = lr->lr_offset;
        length = lr->lr_length;
        eod = offset + length;  /* end of data for this write */

        /*
         * This may be a write from a dmu_sync() for a whole block,
         * and may extend beyond the current end of the file.
         * We can't just replay what was written for this TX_WRITE as
         * a future TX_WRITE2 may extend the eof and the data for that
         * write needs to be there. So we write the whole block and
         * reduce the eof. This needs to be done within the single dmu
         * transaction created within vn_rdwr -> zfs_write. So a possible
         * new end of file is passed through in zfsvfs->z_replay_eof
         */

        zfsvfs->z_replay_eof = 0; /* 0 means don't change end of file */

        /* If it's a dmu_sync() block, write the whole block */
        if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
                uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
                if (length < blocksize) {
                        offset -= offset % blocksize;
                        length = blocksize;
                }
                if (zp->z_size < eod)
                        zfsvfs->z_replay_eof = eod;
        }

        error = vn_rdwr(UIO_WRITE, ZTOV(zp), data, length, offset,
            UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, &resid);

        VN_RELE(ZTOV(zp));
        zfsvfs->z_replay_eof = 0;       /* safety */

        return (error);
}

/*
 * TX_WRITE2 are only generated when dmu_sync() returns EALREADY
 * meaning the pool block is already being synced. So now that we always write
 * out full blocks, all we have to do is expand the eof if
 * the file is grown.
 */
static int
zfs_replay_write2(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_write_t *lr = arg2;
        znode_t *zp;
        int error;
        uint64_t end;

        if (byteswap)
                byteswap_uint64_array(lr, sizeof (*lr));

        if ((error = zfs_zget(zfsvfs, lr->lr_foid, &zp)) != 0)
                return (error);

top:
        end = lr->lr_offset + lr->lr_length;
        if (end > zp->z_size) {
                dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);

                zp->z_size = end;
                dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
                error = dmu_tx_assign(tx, TXG_WAIT);
                if (error) {
                        VN_RELE(ZTOV(zp));
                        if (error == ERESTART) {
                                dmu_tx_wait(tx);
                                dmu_tx_abort(tx);
                                goto top;
                        }
                        dmu_tx_abort(tx);
                        return (error);
                }
                (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
                    (void *)&zp->z_size, sizeof (uint64_t), tx);

                /* Ensure the replayed seq is updated */
                (void) zil_replaying(zfsvfs->z_log, tx);

                dmu_tx_commit(tx);
        }

        VN_RELE(ZTOV(zp));

        return (error);
}

static int
zfs_replay_truncate(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_truncate_t *lr = arg2;
        znode_t *zp;
        flock64_t fl;
        int error;

        if (byteswap)
                byteswap_uint64_array(lr, sizeof (*lr));

        if ((error = zfs_zget(zfsvfs, lr->lr_foid, &zp)) != 0)
                return (error);

        bzero(&fl, sizeof (fl));
        fl.l_type = F_WRLCK;
        fl.l_whence = 0;
        fl.l_start = lr->lr_offset;
        fl.l_len = lr->lr_length;

        error = VOP_SPACE(ZTOV(zp), F_FREESP, &fl, FWRITE | FOFFMAX,
            lr->lr_offset, kcred, NULL);

        VN_RELE(ZTOV(zp));

        return (error);
}

static int
zfs_replay_setattr(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_setattr_t *lr = arg2;
        znode_t *zp;
        xvattr_t xva;
        vattr_t *vap = &xva.xva_vattr;
        int error;
        void *start;

        xva_init(&xva);
        if (byteswap) {
                byteswap_uint64_array(lr, sizeof (*lr));

                if ((lr->lr_mask & AT_XVATTR) &&
                    zfsvfs->z_version >= ZPL_VERSION_INITIAL)
                        zfs_replay_swap_attrs((lr_attr_t *)(lr + 1));
        }

        if ((error = zfs_zget(zfsvfs, lr->lr_foid, &zp)) != 0)
                return (error);

        zfs_init_vattr(vap, lr->lr_mask, lr->lr_mode,
            lr->lr_uid, lr->lr_gid, 0, lr->lr_foid);

        vap->va_size = lr->lr_size;
        ZFS_TIME_DECODE(&vap->va_atime, lr->lr_atime);
        ZFS_TIME_DECODE(&vap->va_mtime, lr->lr_mtime);

        /*
         * Fill in xvattr_t portions if necessary.
         */

        start = (lr_setattr_t *)(lr + 1);
        if (vap->va_mask & AT_XVATTR) {
                zfs_replay_xvattr((lr_attr_t *)start, &xva);
                start = (caddr_t)start +
                    ZIL_XVAT_SIZE(((lr_attr_t *)start)->lr_attr_masksize);
        } else
                xva.xva_vattr.va_mask &= ~AT_XVATTR;

        zfsvfs->z_fuid_replay = zfs_replay_fuid_domain(start, &start,
            lr->lr_uid, lr->lr_gid);

        error = VOP_SETATTR(ZTOV(zp), vap, 0, kcred, NULL);

        zfs_fuid_info_free(zfsvfs->z_fuid_replay);
        zfsvfs->z_fuid_replay = NULL;
        VN_RELE(ZTOV(zp));

        return (error);
}

static int
zfs_replay_acl_v0(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_acl_v0_t *lr = arg2;
        ace_t *ace = (ace_t *)(lr + 1); /* ace array follows lr_acl_t */
        vsecattr_t vsa;
        znode_t *zp;
        int error;

        if (byteswap) {
                byteswap_uint64_array(lr, sizeof (*lr));
                zfs_oldace_byteswap(ace, lr->lr_aclcnt);
        }

        if ((error = zfs_zget(zfsvfs, lr->lr_foid, &zp)) != 0)
                return (error);

        bzero(&vsa, sizeof (vsa));
        vsa.vsa_mask = VSA_ACE | VSA_ACECNT;
        vsa.vsa_aclcnt = lr->lr_aclcnt;
        vsa.vsa_aclentsz = sizeof (ace_t) * vsa.vsa_aclcnt;
        vsa.vsa_aclflags = 0;
        vsa.vsa_aclentp = ace;

        error = VOP_SETSECATTR(ZTOV(zp), &vsa, 0, kcred, NULL);

        VN_RELE(ZTOV(zp));

        return (error);
}

/*
 * Replaying ACLs is complicated by FUID support.
 * The log record may contain some optional data
 * to be used for replaying FUID's.  These pieces
 * are the actual FUIDs that were created initially.
 * The FUID table index may no longer be valid and
 * during zfs_create() a new index may be assigned.
 * Because of this the log will contain the original
 * doman+rid in order to create a new FUID.
 *
 * The individual ACEs may contain an ephemeral uid/gid which is no
 * longer valid and will need to be replaced with an actual FUID.
 *
 */
static int
zfs_replay_acl(void *arg1, void *arg2, boolean_t byteswap)
{
        zfsvfs_t *zfsvfs = arg1;
        lr_acl_t *lr = arg2;
        ace_t *ace = (ace_t *)(lr + 1);
        vsecattr_t vsa;
        znode_t *zp;
        int error;

        if (byteswap) {
                byteswap_uint64_array(lr, sizeof (*lr));
                zfs_ace_byteswap(ace, lr->lr_acl_bytes, B_FALSE);
                if (lr->lr_fuidcnt) {
                        byteswap_uint64_array((caddr_t)ace +
                            ZIL_ACE_LENGTH(lr->lr_acl_bytes),
                            lr->lr_fuidcnt * sizeof (uint64_t));
                }
        }

        if ((error = zfs_zget(zfsvfs, lr->lr_foid, &zp)) != 0)
                return (error);

        bzero(&vsa, sizeof (vsa));
        vsa.vsa_mask = VSA_ACE | VSA_ACECNT | VSA_ACE_ACLFLAGS;
        vsa.vsa_aclcnt = lr->lr_aclcnt;
        vsa.vsa_aclentp = ace;
        vsa.vsa_aclentsz = lr->lr_acl_bytes;
        vsa.vsa_aclflags = lr->lr_acl_flags;

        if (lr->lr_fuidcnt) {
                void *fuidstart = (caddr_t)ace +
                    ZIL_ACE_LENGTH(lr->lr_acl_bytes);

                zfsvfs->z_fuid_replay =
                    zfs_replay_fuids(fuidstart, &fuidstart,
                    lr->lr_fuidcnt, lr->lr_domcnt, 0, 0);
        }

        error = VOP_SETSECATTR(ZTOV(zp), &vsa, 0, kcred, NULL);

        if (zfsvfs->z_fuid_replay)
                zfs_fuid_info_free(zfsvfs->z_fuid_replay);

        zfsvfs->z_fuid_replay = NULL;
        VN_RELE(ZTOV(zp));

        return (error);
}

/*
 * Callback vectors for replaying records
 */
zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE] = {
        zfs_replay_error,       /* 0 no such transaction type */
        zfs_replay_create,      /* TX_CREATE */
        zfs_replay_create,      /* TX_MKDIR */
        zfs_replay_create,      /* TX_MKXATTR */
        zfs_replay_create,      /* TX_SYMLINK */
        zfs_replay_remove,      /* TX_REMOVE */
        zfs_replay_remove,      /* TX_RMDIR */
        zfs_replay_link,        /* TX_LINK */
        zfs_replay_rename,      /* TX_RENAME */
        zfs_replay_write,       /* TX_WRITE */
        zfs_replay_truncate,    /* TX_TRUNCATE */
        zfs_replay_setattr,     /* TX_SETATTR */
        zfs_replay_acl_v0,      /* TX_ACL_V0 */
        zfs_replay_acl,         /* TX_ACL */
        zfs_replay_create_acl,  /* TX_CREATE_ACL */
        zfs_replay_create,      /* TX_CREATE_ATTR */
        zfs_replay_create_acl,  /* TX_CREATE_ACL_ATTR */
        zfs_replay_create_acl,  /* TX_MKDIR_ACL */
        zfs_replay_create,      /* TX_MKDIR_ATTR */
        zfs_replay_create_acl,  /* TX_MKDIR_ACL_ATTR */
        zfs_replay_write2,      /* TX_WRITE2 */
};