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zfs_replay.c

/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#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(zfsvfs_t *zfsvfs, lr_t *lr, boolean_t byteswap)
{
      return (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))
            bcopy(scanstamp, xoap->xoa_av_scanstamp, AV_SCANSTAMP_SZ);
}

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(zfsvfs_t *zfsvfs,
    lr_acl_create_t *lracl, boolean_t byteswap)
{
      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;
      int error;

      if (byteswap) {
            byteswap_uint64_array(lracl, sizeof (*lracl));
            txtype = (int)lr->lr_common.lrc_txtype;
            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, B_FALSE)) != 0)
            return (error);

      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, lr->lr_foid);

      /*
       * All forms of zfs create (create, mkdir, mkxattrdir, symlink)
       * eventually end up in zfs_mknode(), which assigns the object's
       * creation time and generation number.  The generic VOP_CREATE()
       * doesn't have either concept, so we smuggle the values inside
       * the vattr's otherwise unused va_ctime and va_nblocks fields.
       */
      ZFS_TIME_DECODE(&xva.xva_vattr.va_ctime, lr->lr_crtime);
      xva.xva_vattr.va_nblocks = lr->lr_gen;

      error = dmu_object_info(zfsvfs->z_os, lr->lr_foid, NULL);
      if (error != ENOENT)
            goto bail;

      if (lr->lr_common.lrc_txtype & TX_CI)
            vflg |= FIGNORECASE;
      switch ((int)lr->lr_common.lrc_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 = ENOTSUP;
      }

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

      VN_RELE(ZTOV(dzp));

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

      return (error);
}

static int
zfs_replay_create(zfsvfs_t *zfsvfs, lr_create_t *lr, boolean_t byteswap)
{
      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;

      if (byteswap) {
            byteswap_uint64_array(lr, sizeof (*lr));
            txtype = (int)lr->lr_common.lrc_txtype;
            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, B_FALSE)) != 0)
            return (error);

      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, lr->lr_foid);

      /*
       * All forms of zfs create (create, mkdir, mkxattrdir, symlink)
       * eventually end up in zfs_mknode(), which assigns the object's
       * creation time and generation number.  The generic VOP_CREATE()
       * doesn't have either concept, so we smuggle the values inside
       * the vattr's otherwise unused va_ctime and va_nblocks fields.
       */
      ZFS_TIME_DECODE(&xva.xva_vattr.va_ctime, lr->lr_crtime);
      xva.xva_vattr.va_nblocks = lr->lr_gen;

      error = dmu_object_info(zfsvfs->z_os, lr->lr_foid, NULL);
      if (error != ENOENT)
            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 ((int)lr->lr_common.lrc_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:
            name = (char *)(lr + 1);
            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 = 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(zfsvfs_t *zfsvfs, lr_remove_t *lr, boolean_t byteswap)
{
      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, B_FALSE)) != 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 = ENOTSUP;
      }

      VN_RELE(ZTOV(dzp));

      return (error);
}

static int
zfs_replay_link(zfsvfs_t *zfsvfs, lr_link_t *lr, boolean_t byteswap)
{
      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, B_FALSE)) != 0)
            return (error);

      if ((error = zfs_zget(zfsvfs, lr->lr_link_obj, &zp, B_FALSE)) != 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(zfsvfs_t *zfsvfs, lr_rename_t *lr, boolean_t byteswap)
{
      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, B_FALSE)) != 0)
            return (error);

      if ((error = zfs_zget(zfsvfs, lr->lr_tdoid, &tdzp, B_FALSE)) != 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(zfsvfs_t *zfsvfs, lr_write_t *lr, boolean_t byteswap)
{
      char *data = (char *)(lr + 1);      /* data follows lr_write_t */
      znode_t     *zp;
      int error;
      ssize_t resid;

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

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

      error = vn_rdwr(UIO_WRITE, ZTOV(zp), data, lr->lr_length,
          lr->lr_offset, UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, &resid);

      VN_RELE(ZTOV(zp));

      return (error);
}

static int
zfs_replay_truncate(zfsvfs_t *zfsvfs, lr_truncate_t *lr, boolean_t byteswap)
{
      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, B_FALSE)) != 0) {
            /*
             * As we can log truncates out of order, it's possible the
             * file has been removed. In this case just drop the truncate
             * and return success.
             */
            if (error == ENOENT)
                  error = 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(zfsvfs_t *zfsvfs, lr_setattr_t *lr, boolean_t byteswap)
{
      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, B_FALSE)) != 0) {
            /*
             * As we can log setattrs out of order, it's possible the
             * file has been removed. In this case just drop the setattr
             * and return success.
             */
            if (error == ENOENT)
                  error = 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(zfsvfs_t *zfsvfs, lr_acl_v0_t *lr, boolean_t byteswap)
{
      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, B_FALSE)) != 0) {
            /*
             * As we can log acls out of order, it's possible the
             * file has been removed. In this case just drop the acl
             * and return success.
             */
            if (error == ENOENT)
                  error = 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(zfsvfs_t *zfsvfs, lr_acl_t *lr, boolean_t byteswap)
{
      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, B_FALSE)) != 0) {
            /*
             * As we can log acls out of order, it's possible the
             * file has been removed. In this case just drop the acl
             * and return success.
             */
            if (error == ENOENT)
                  error = 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 */
};

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