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zfs_log.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.
 */

#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/file.h>
#include <sys/vfs.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_dir.h>
#include <sys/zil.h>
#include <sys/zil_impl.h>
#include <sys/byteorder.h>
#include <sys/policy.h>
#include <sys/stat.h>
#include <sys/acl.h>
#include <sys/dmu.h>
#include <sys/spa.h>
#include <sys/zfs_fuid.h>

/*
 * All the functions in this file are used to construct the log entries
 * to record transactions. They allocate * an intent log transaction
 * structure (itx_t) and save within it all the information necessary to
 * possibly replay the transaction. The itx is then assigned a sequence
 * number and inserted in the in-memory list anchored in the zilog.
 */

int
zfs_log_create_txtype(zil_create_t type, vsecattr_t *vsecp, vattr_t *vap)
{
      int isxvattr = (vap->va_mask & AT_XVATTR);
      switch (type) {
      case Z_FILE:
            if (vsecp == NULL && !isxvattr)
                  return (TX_CREATE);
            if (vsecp && isxvattr)
#ifdef TODO
                  return (TX_CREATE_ACL_ATTR);
#else
                  panic("%s:%u: unsupported condition", __func__, __LINE__);
#endif
            if (vsecp)
                  return (TX_CREATE_ACL);
            else
                  return (TX_CREATE_ATTR);
            /*NOTREACHED*/
      case Z_DIR:
            if (vsecp == NULL && !isxvattr)
                  return (TX_MKDIR);
            if (vsecp && isxvattr)
#ifdef TODO
                  return (TX_MKDIR_ACL_ATTR);
#else
                  panic("%s:%u: unsupported condition", __func__, __LINE__);
#endif
            if (vsecp)
                  return (TX_MKDIR_ACL);
            else
                  return (TX_MKDIR_ATTR);
      case Z_XATTRDIR:
            return (TX_MKXATTR);
      }
      ASSERT(0);
      return (TX_MAX_TYPE);
}

/*
 * build up the log data necessary for logging xvattr_t
 * First lr_attr_t is initialized.  following the lr_attr_t
 * is the mapsize and attribute bitmap copied from the xvattr_t.
 * Following the bitmap and bitmapsize two 64 bit words are reserved
 * for the create time which may be set.  Following the create time
 * records a single 64 bit integer which has the bits to set on
 * replay for the xvattr.
 */
static void
zfs_log_xvattr(lr_attr_t *lrattr, xvattr_t *xvap)
{
      uint32_t    *bitmap;
      uint64_t    *attrs;
      uint64_t    *crtime;
      xoptattr_t  *xoap;
      void        *scanstamp;
      int         i;

      xoap = xva_getxoptattr(xvap);
      ASSERT(xoap);

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

      /* Now pack the attributes up in a single uint64_t */
      attrs = (uint64_t *)bitmap;
      crtime = attrs + 1;
      scanstamp = (caddr_t)(crtime + 2);
      *attrs = 0;
      if (XVA_ISSET_REQ(xvap, XAT_READONLY))
            *attrs |= (xoap->xoa_readonly == 0) ? 0 :
                XAT0_READONLY;
      if (XVA_ISSET_REQ(xvap, XAT_HIDDEN))
            *attrs |= (xoap->xoa_hidden == 0) ? 0 :
                XAT0_HIDDEN;
      if (XVA_ISSET_REQ(xvap, XAT_SYSTEM))
            *attrs |= (xoap->xoa_system == 0) ? 0 :
                XAT0_SYSTEM;
      if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE))
            *attrs |= (xoap->xoa_archive == 0) ? 0 :
                XAT0_ARCHIVE;
      if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE))
            *attrs |= (xoap->xoa_immutable == 0) ? 0 :
                XAT0_IMMUTABLE;
      if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK))
            *attrs |= (xoap->xoa_nounlink == 0) ? 0 :
                XAT0_NOUNLINK;
      if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY))
            *attrs |= (xoap->xoa_appendonly == 0) ? 0 :
                XAT0_APPENDONLY;
      if (XVA_ISSET_REQ(xvap, XAT_OPAQUE))
            *attrs |= (xoap->xoa_opaque == 0) ? 0 :
                XAT0_APPENDONLY;
      if (XVA_ISSET_REQ(xvap, XAT_NODUMP))
            *attrs |= (xoap->xoa_nodump == 0) ? 0 :
                XAT0_NODUMP;
      if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED))
            *attrs |= (xoap->xoa_av_quarantined == 0) ? 0 :
                XAT0_AV_QUARANTINED;
      if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED))
            *attrs |= (xoap->xoa_av_modified == 0) ? 0 :
                XAT0_AV_MODIFIED;
      if (XVA_ISSET_REQ(xvap, XAT_CREATETIME))
            ZFS_TIME_ENCODE(&xoap->xoa_createtime, crtime);
      if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
            bcopy(xoap->xoa_av_scanstamp, scanstamp, AV_SCANSTAMP_SZ);
}

static void *
zfs_log_fuid_ids(zfs_fuid_info_t *fuidp, void *start)
{
      zfs_fuid_t *zfuid;
      uint64_t *fuidloc = start;

      /* First copy in the ACE FUIDs */
      for (zfuid = list_head(&fuidp->z_fuids); zfuid;
          zfuid = list_next(&fuidp->z_fuids, zfuid)) {
            *fuidloc++ = zfuid->z_logfuid;
      }
      return (fuidloc);
}


static void *
zfs_log_fuid_domains(zfs_fuid_info_t *fuidp, void *start)
{
      zfs_fuid_domain_t *zdomain;

      /* now copy in the domain info, if any */
      if (fuidp->z_domain_str_sz != 0) {
            for (zdomain = list_head(&fuidp->z_domains); zdomain;
                zdomain = list_next(&fuidp->z_domains, zdomain)) {
                  bcopy((void *)zdomain->z_domain, start,
                      strlen(zdomain->z_domain) + 1);
                  start = (caddr_t)start +
                      strlen(zdomain->z_domain) + 1;
            }
      }
      return (start);
}

/*
 * zfs_log_create() is used to handle TX_CREATE, TX_CREATE_ATTR, TX_MKDIR,
 * TX_MKDIR_ATTR and TX_MKXATTR
 * transactions.
 *
 * TX_CREATE and TX_MKDIR are standard creates, but they may have FUID
 * domain information appended prior to the name.  In this case the
 * uid/gid in the log record will be a log centric FUID.
 *
 * TX_CREATE_ACL_ATTR and TX_MKDIR_ACL_ATTR handle special creates that
 * may contain attributes, ACL and optional fuid information.
 *
 * TX_CREATE_ACL and TX_MKDIR_ACL handle special creates that specify
 * and ACL and normal users/groups in the ACEs.
 *
 * There may be an optional xvattr attribute information similar
 * to zfs_log_setattr.
 *
 * Also, after the file name "domain" strings may be appended.
 */
void
zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
    znode_t *dzp, znode_t *zp, char *name, vsecattr_t *vsecp,
    zfs_fuid_info_t *fuidp, vattr_t *vap)
{
      itx_t *itx;
      uint64_t seq;
      lr_create_t *lr;
      lr_acl_create_t *lracl;
      size_t aclsize;
      size_t xvatsize = 0;
      size_t txsize;
      xvattr_t *xvap = (xvattr_t *)vap;
      void *end;
      size_t lrsize;
      size_t namesize = strlen(name) + 1;
      size_t fuidsz = 0;

      if (zilog == NULL)
            return;

      /*
       * If we have FUIDs present then add in space for
       * domains and ACE fuid's if any.
       */
      if (fuidp) {
            fuidsz += fuidp->z_domain_str_sz;
            fuidsz += fuidp->z_fuid_cnt * sizeof (uint64_t);
      }

      if (vap->va_mask & AT_XVATTR)
            xvatsize = ZIL_XVAT_SIZE(xvap->xva_mapsize);

      if ((int)txtype == TX_CREATE_ATTR || (int)txtype == TX_MKDIR_ATTR ||
          (int)txtype == TX_CREATE || (int)txtype == TX_MKDIR ||
          (int)txtype == TX_MKXATTR) {
            txsize = sizeof (*lr) + namesize + fuidsz + xvatsize;
            lrsize = sizeof (*lr);
      } else {
            aclsize = (vsecp) ? vsecp->vsa_aclentsz : 0;
            txsize =
                sizeof (lr_acl_create_t) + namesize + fuidsz +
                ZIL_ACE_LENGTH(aclsize) + xvatsize;
            lrsize = sizeof (lr_acl_create_t);
      }

      itx = zil_itx_create(txtype, txsize);

      lr = (lr_create_t *)&itx->itx_lr;
      lr->lr_doid = dzp->z_id;
      lr->lr_foid = zp->z_id;
      lr->lr_mode = zp->z_phys->zp_mode;
      if (!IS_EPHEMERAL(zp->z_phys->zp_uid)) {
            lr->lr_uid = (uint64_t)zp->z_phys->zp_uid;
      } else {
            lr->lr_uid = fuidp->z_fuid_owner;
      }
      if (!IS_EPHEMERAL(zp->z_phys->zp_gid)) {
            lr->lr_gid = (uint64_t)zp->z_phys->zp_gid;
      } else {
            lr->lr_gid = fuidp->z_fuid_group;
      }
      lr->lr_gen = zp->z_phys->zp_gen;
      lr->lr_crtime[0] = zp->z_phys->zp_crtime[0];
      lr->lr_crtime[1] = zp->z_phys->zp_crtime[1];
      lr->lr_rdev = zp->z_phys->zp_rdev;

      /*
       * Fill in xvattr info if any
       */
      if (vap->va_mask & AT_XVATTR) {
            zfs_log_xvattr((lr_attr_t *)((caddr_t)lr + lrsize), xvap);
            end = (caddr_t)lr + lrsize + xvatsize;
      } else {
            end = (caddr_t)lr + lrsize;
      }

      /* Now fill in any ACL info */

      if (vsecp) {
            lracl = (lr_acl_create_t *)&itx->itx_lr;
            lracl->lr_aclcnt = vsecp->vsa_aclcnt;
            lracl->lr_acl_bytes = aclsize;
            lracl->lr_domcnt = fuidp ? fuidp->z_domain_cnt : 0;
            lracl->lr_fuidcnt  = fuidp ? fuidp->z_fuid_cnt : 0;
            if (vsecp->vsa_aclflags & VSA_ACE_ACLFLAGS)
                  lracl->lr_acl_flags = (uint64_t)vsecp->vsa_aclflags;
            else
                  lracl->lr_acl_flags = 0;

            bcopy(vsecp->vsa_aclentp, end, aclsize);
            end = (caddr_t)end + ZIL_ACE_LENGTH(aclsize);
      }

      /* drop in FUID info */
      if (fuidp) {
            end = zfs_log_fuid_ids(fuidp, end);
            end = zfs_log_fuid_domains(fuidp, end);
      }
      /*
       * Now place file name in log record
       */
      bcopy(name, end, namesize);

      seq = zil_itx_assign(zilog, itx, tx);
      dzp->z_last_itx = seq;
      zp->z_last_itx = seq;
}

/*
 * zfs_log_remove() handles both TX_REMOVE and TX_RMDIR transactions.
 */
void
zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
      znode_t *dzp, char *name)
{
      itx_t *itx;
      uint64_t seq;
      lr_remove_t *lr;
      size_t namesize = strlen(name) + 1;

      if (zilog == NULL)
            return;

      itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
      lr = (lr_remove_t *)&itx->itx_lr;
      lr->lr_doid = dzp->z_id;
      bcopy(name, (char *)(lr + 1), namesize);

      seq = zil_itx_assign(zilog, itx, tx);
      dzp->z_last_itx = seq;
}

/*
 * zfs_log_link() handles TX_LINK transactions.
 */
void
zfs_log_link(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
      znode_t *dzp, znode_t *zp, char *name)
{
      itx_t *itx;
      uint64_t seq;
      lr_link_t *lr;
      size_t namesize = strlen(name) + 1;

      if (zilog == NULL)
            return;

      itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
      lr = (lr_link_t *)&itx->itx_lr;
      lr->lr_doid = dzp->z_id;
      lr->lr_link_obj = zp->z_id;
      bcopy(name, (char *)(lr + 1), namesize);

      seq = zil_itx_assign(zilog, itx, tx);
      dzp->z_last_itx = seq;
      zp->z_last_itx = seq;
}

/*
 * zfs_log_symlink() handles TX_SYMLINK transactions.
 */
void
zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
    znode_t *dzp, znode_t *zp, char *name, char *link)
{
      itx_t *itx;
      uint64_t seq;
      lr_create_t *lr;
      size_t namesize = strlen(name) + 1;
      size_t linksize = strlen(link) + 1;

      if (zilog == NULL)
            return;

      itx = zil_itx_create(txtype, sizeof (*lr) + namesize + linksize);
      lr = (lr_create_t *)&itx->itx_lr;
      lr->lr_doid = dzp->z_id;
      lr->lr_foid = zp->z_id;
      lr->lr_mode = zp->z_phys->zp_mode;
      lr->lr_uid = zp->z_phys->zp_uid;
      lr->lr_gid = zp->z_phys->zp_gid;
      lr->lr_gen = zp->z_phys->zp_gen;
      lr->lr_crtime[0] = zp->z_phys->zp_crtime[0];
      lr->lr_crtime[1] = zp->z_phys->zp_crtime[1];
      bcopy(name, (char *)(lr + 1), namesize);
      bcopy(link, (char *)(lr + 1) + namesize, linksize);

      seq = zil_itx_assign(zilog, itx, tx);
      dzp->z_last_itx = seq;
      zp->z_last_itx = seq;
}

/*
 * zfs_log_rename() handles TX_RENAME transactions.
 */
void
zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
      znode_t *sdzp, char *sname, znode_t *tdzp, char *dname, znode_t *szp)
{
      itx_t *itx;
      uint64_t seq;
      lr_rename_t *lr;
      size_t snamesize = strlen(sname) + 1;
      size_t dnamesize = strlen(dname) + 1;

      if (zilog == NULL)
            return;

      itx = zil_itx_create(txtype, sizeof (*lr) + snamesize + dnamesize);
      lr = (lr_rename_t *)&itx->itx_lr;
      lr->lr_sdoid = sdzp->z_id;
      lr->lr_tdoid = tdzp->z_id;
      bcopy(sname, (char *)(lr + 1), snamesize);
      bcopy(dname, (char *)(lr + 1) + snamesize, dnamesize);

      seq = zil_itx_assign(zilog, itx, tx);
      sdzp->z_last_itx = seq;
      tdzp->z_last_itx = seq;
      szp->z_last_itx = seq;
}

/*
 * zfs_log_write() handles TX_WRITE transactions.
 */
ssize_t zfs_immediate_write_sz = 32768;

#define     ZIL_MAX_LOG_DATA (SPA_MAXBLOCKSIZE - sizeof (zil_trailer_t) - \
    sizeof (lr_write_t))

void
zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype,
      znode_t *zp, offset_t off, ssize_t resid, int ioflag)
{
      itx_wr_state_t write_state;
      boolean_t slogging;
      uintptr_t fsync_cnt;

      if (zilog == NULL || zp->z_unlinked)
            return;

      /*
       * Writes are handled in three different ways:
       *
       * WR_INDIRECT:
       *    In this mode, if we need to commit the write later, then the block
       *    is immediately written into the file system (using dmu_sync),
       *    and a pointer to the block is put into the log record.
       *    When the txg commits the block is linked in.
       *    This saves additionally writing the data into the log record.
       *    There are a few requirements for this to occur:
       *    - write is greater than zfs_immediate_write_sz
       *    - not using slogs (as slogs are assumed to always be faster
       *      than writing into the main pool)
       *    - the write occupies only one block
       * WR_COPIED:
       *    If we know we'll immediately be committing the
       *    transaction (FSYNC or FDSYNC), the we allocate a larger
       *    log record here for the data and copy the data in.
       * WR_NEED_COPY:
       *    Otherwise we don't allocate a buffer, and *if* we need to
       *    flush the write later then a buffer is allocated and
       *    we retrieve the data using the dmu.
       */
      slogging = spa_has_slogs(zilog->zl_spa);
      if (resid > zfs_immediate_write_sz && !slogging && resid <= zp->z_blksz)
            write_state = WR_INDIRECT;
      else if (ioflag & (FSYNC | FDSYNC))
            write_state = WR_COPIED;
      else
            write_state = WR_NEED_COPY;

      if ((fsync_cnt = (uintptr_t)tsd_get(zfs_fsyncer_key)) != 0) {
            (void) tsd_set(zfs_fsyncer_key, (void *)(fsync_cnt - 1));
      }

      while (resid) {
            itx_t *itx;
            lr_write_t *lr;
            ssize_t len;

            /*
             * If the write would overflow the largest block then split it.
             */
            if (write_state != WR_INDIRECT && resid > ZIL_MAX_LOG_DATA)
                  len = SPA_MAXBLOCKSIZE >> 1;
            else
                  len = resid;

            itx = zil_itx_create(txtype, sizeof (*lr) +
                (write_state == WR_COPIED ? len : 0));
            lr = (lr_write_t *)&itx->itx_lr;
            if (write_state == WR_COPIED && dmu_read(zp->z_zfsvfs->z_os,
                zp->z_id, off, len, lr + 1) != 0) {
                  kmem_free(itx, offsetof(itx_t, itx_lr) +
                      itx->itx_lr.lrc_reclen);
                  itx = zil_itx_create(txtype, sizeof (*lr));
                  lr = (lr_write_t *)&itx->itx_lr;
                  write_state = WR_NEED_COPY;
            }

            itx->itx_wr_state = write_state;
            if (write_state == WR_NEED_COPY)
                  itx->itx_sod += len;
            lr->lr_foid = zp->z_id;
            lr->lr_offset = off;
            lr->lr_length = len;
            lr->lr_blkoff = 0;
            BP_ZERO(&lr->lr_blkptr);

            itx->itx_private = zp->z_zfsvfs;

            if ((zp->z_sync_cnt != 0) || (fsync_cnt != 0) ||
                (ioflag & (FSYNC | FDSYNC)))
                  itx->itx_sync = B_TRUE;
            else
                  itx->itx_sync = B_FALSE;

            zp->z_last_itx = zil_itx_assign(zilog, itx, tx);

            off += len;
            resid -= len;
      }
}

/*
 * zfs_log_truncate() handles TX_TRUNCATE transactions.
 */
void
zfs_log_truncate(zilog_t *zilog, dmu_tx_t *tx, int txtype,
      znode_t *zp, uint64_t off, uint64_t len)
{
      itx_t *itx;
      uint64_t seq;
      lr_truncate_t *lr;

      if (zilog == NULL || zp->z_unlinked)
            return;

      itx = zil_itx_create(txtype, sizeof (*lr));
      lr = (lr_truncate_t *)&itx->itx_lr;
      lr->lr_foid = zp->z_id;
      lr->lr_offset = off;
      lr->lr_length = len;

      itx->itx_sync = (zp->z_sync_cnt != 0);
      seq = zil_itx_assign(zilog, itx, tx);
      zp->z_last_itx = seq;
}

/*
 * zfs_log_setattr() handles TX_SETATTR transactions.
 */
void
zfs_log_setattr(zilog_t *zilog, dmu_tx_t *tx, int txtype,
      znode_t *zp, vattr_t *vap, uint_t mask_applied, zfs_fuid_info_t *fuidp)
{
      itx_t       *itx;
      uint64_t    seq;
      lr_setattr_t      *lr;
      xvattr_t    *xvap = (xvattr_t *)vap;
      size_t            recsize = sizeof (lr_setattr_t);
      void        *start;


      if (zilog == NULL || zp->z_unlinked)
            return;

      /*
       * If XVATTR set, then log record size needs to allow
       * for lr_attr_t + xvattr mask, mapsize and create time
       * plus actual attribute values
       */
      if (vap->va_mask & AT_XVATTR)
            recsize = sizeof (*lr) + ZIL_XVAT_SIZE(xvap->xva_mapsize);

      if (fuidp)
            recsize += fuidp->z_domain_str_sz;

      itx = zil_itx_create(txtype, recsize);
      lr = (lr_setattr_t *)&itx->itx_lr;
      lr->lr_foid = zp->z_id;
      lr->lr_mask = (uint64_t)mask_applied;
      lr->lr_mode = (uint64_t)vap->va_mode;
      if ((mask_applied & AT_UID) && IS_EPHEMERAL(vap->va_uid))
            lr->lr_uid = fuidp->z_fuid_owner;
      else
            lr->lr_uid = (uint64_t)vap->va_uid;

      if ((mask_applied & AT_GID) && IS_EPHEMERAL(vap->va_gid))
            lr->lr_gid = fuidp->z_fuid_group;
      else
            lr->lr_gid = (uint64_t)vap->va_gid;

      lr->lr_size = (uint64_t)vap->va_size;
      ZFS_TIME_ENCODE(&vap->va_atime, lr->lr_atime);
      ZFS_TIME_ENCODE(&vap->va_mtime, lr->lr_mtime);
      start = (lr_setattr_t *)(lr + 1);
      if (vap->va_mask & AT_XVATTR) {
            zfs_log_xvattr((lr_attr_t *)start, xvap);
            start = (caddr_t)start + ZIL_XVAT_SIZE(xvap->xva_mapsize);
      }

      /*
       * Now stick on domain information if any on end
       */

      if (fuidp)
            (void) zfs_log_fuid_domains(fuidp, start);

      itx->itx_sync = (zp->z_sync_cnt != 0);
      seq = zil_itx_assign(zilog, itx, tx);
      zp->z_last_itx = seq;
}

/*
 * zfs_log_acl() handles TX_ACL transactions.
 */
void
zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, znode_t *zp,
    vsecattr_t *vsecp, zfs_fuid_info_t *fuidp)
{
      itx_t *itx;
      uint64_t seq;
      lr_acl_v0_t *lrv0;
      lr_acl_t *lr;
      int txtype;
      int lrsize;
      size_t txsize;
      size_t aclbytes = vsecp->vsa_aclentsz;

      if (zilog == NULL || zp->z_unlinked)
            return;

      txtype = (zp->z_zfsvfs->z_version < ZPL_VERSION_FUID) ?
          TX_ACL_V0 : TX_ACL;

      if (txtype == TX_ACL)
            lrsize = sizeof (*lr);
      else
            lrsize = sizeof (*lrv0);

      txsize = lrsize +
          ((txtype == TX_ACL) ? ZIL_ACE_LENGTH(aclbytes) : aclbytes) +
          (fuidp ? fuidp->z_domain_str_sz : 0) +
          sizeof (uint64_t) * (fuidp ? fuidp->z_fuid_cnt : 0);

      itx = zil_itx_create(txtype, txsize);

      lr = (lr_acl_t *)&itx->itx_lr;
      lr->lr_foid = zp->z_id;
      if (txtype == TX_ACL) {
            lr->lr_acl_bytes = aclbytes;
            lr->lr_domcnt = fuidp ? fuidp->z_domain_cnt : 0;
            lr->lr_fuidcnt = fuidp ? fuidp->z_fuid_cnt : 0;
            if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS)
                  lr->lr_acl_flags = (uint64_t)vsecp->vsa_aclflags;
            else
                  lr->lr_acl_flags = 0;
      }
      lr->lr_aclcnt = (uint64_t)vsecp->vsa_aclcnt;

      if (txtype == TX_ACL_V0) {
            lrv0 = (lr_acl_v0_t *)lr;
            bcopy(vsecp->vsa_aclentp, (ace_t *)(lrv0 + 1), aclbytes);
      } else {
            void *start = (ace_t *)(lr + 1);

            bcopy(vsecp->vsa_aclentp, start, aclbytes);

            start = (caddr_t)start + ZIL_ACE_LENGTH(aclbytes);

            if (fuidp) {
                  start = zfs_log_fuid_ids(fuidp, start);
                  (void) zfs_log_fuid_domains(fuidp, start);
            }
      }

      itx->itx_sync = (zp->z_sync_cnt != 0);
      seq = zil_itx_assign(zilog, itx, tx);
      zp->z_last_itx = seq;
}

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