zfs_log.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License (the "License").
    6  * You may not use this file except in compliance with the License.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or https://opensource.org/licenses/CDDL-1.0.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   13  * When distributing Covered Code, include this CDDL HEADER in each
   14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   15  * If applicable, add the following below this CDDL HEADER, with the
   16  * fields enclosed by brackets "[]" replaced with your own identifying
   17  * information: Portions Copyright [yyyy] [name of copyright owner]
   18  *
   19  * CDDL HEADER END
   20  */
   21 /*
   22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
   23  * Copyright (c) 2015, 2018 by Delphix. All rights reserved.
   24  */
   25 
   26 
   27 #include <sys/types.h>
   28 #include <sys/param.h>
   29 #include <sys/sysmacros.h>
   30 #include <sys/cmn_err.h>
   31 #include <sys/kmem.h>
   32 #include <sys/thread.h>
   33 #include <sys/file.h>
   34 #include <sys/vfs.h>
   35 #include <sys/zfs_znode.h>
   36 #include <sys/zfs_dir.h>
   37 #include <sys/zil.h>
   38 #include <sys/zil_impl.h>
   39 #include <sys/byteorder.h>
   40 #include <sys/policy.h>
   41 #include <sys/stat.h>
   42 #include <sys/acl.h>
   43 #include <sys/dmu.h>
   44 #include <sys/dbuf.h>
   45 #include <sys/spa.h>
   46 #include <sys/zfs_fuid.h>
   47 #include <sys/dsl_dataset.h>
   48 
   49 /*
   50  * These zfs_log_* functions must be called within a dmu tx, in one
   51  * of 2 contexts depending on zilog->z_replay:
   52  *
   53  * Non replay mode
   54  * ---------------
   55  * We need to record the transaction so that if it is committed to
   56  * the Intent Log then it can be replayed.  An intent log transaction
   57  * structure (itx_t) is allocated and all the information necessary to
   58  * possibly replay the transaction is saved in it. The itx is then assigned
   59  * a sequence number and inserted in the in-memory list anchored in the zilog.
   60  *
   61  * Replay mode
   62  * -----------
   63  * We need to mark the intent log record as replayed in the log header.
   64  * This is done in the same transaction as the replay so that they
   65  * commit atomically.
   66  */
   67 
   68 int
   69 zfs_log_create_txtype(zil_create_t type, vsecattr_t *vsecp, vattr_t *vap)
   70 {
   71         int isxvattr = (vap->va_mask & ATTR_XVATTR);
   72         switch (type) {
   73         case Z_FILE:
   74                 if (vsecp == NULL && !isxvattr)
   75                         return (TX_CREATE);
   76                 if (vsecp && isxvattr)
   77                         return (TX_CREATE_ACL_ATTR);
   78                 if (vsecp)
   79                         return (TX_CREATE_ACL);
   80                 else
   81                         return (TX_CREATE_ATTR);
   82         case Z_DIR:
   83                 if (vsecp == NULL && !isxvattr)
   84                         return (TX_MKDIR);
   85                 if (vsecp && isxvattr)
   86                         return (TX_MKDIR_ACL_ATTR);
   87                 if (vsecp)
   88                         return (TX_MKDIR_ACL);
   89                 else
   90                         return (TX_MKDIR_ATTR);
   91         case Z_XATTRDIR:
   92                 return (TX_MKXATTR);
   93         }
   94         ASSERT(0);
   95         return (TX_MAX_TYPE);
   96 }
   97 
   98 /*
   99  * build up the log data necessary for logging xvattr_t
  100  * First lr_attr_t is initialized.  following the lr_attr_t
  101  * is the mapsize and attribute bitmap copied from the xvattr_t.
  102  * Following the bitmap and bitmapsize two 64 bit words are reserved
  103  * for the create time which may be set.  Following the create time
  104  * records a single 64 bit integer which has the bits to set on
  105  * replay for the xvattr.
  106  */
  107 static void
  108 zfs_log_xvattr(lr_attr_t *lrattr, xvattr_t *xvap)
  109 {
  110         xoptattr_t *xoap;
  111 
  112         xoap = xva_getxoptattr(xvap);
  113         ASSERT(xoap);
  114 
  115         lrattr->lr_attr_masksize = xvap->xva_mapsize;
  116         uint32_t *bitmap = &lrattr->lr_attr_bitmap;
  117         for (int i = 0; i != xvap->xva_mapsize; i++, bitmap++)
  118                 *bitmap = xvap->xva_reqattrmap[i];
  119 
  120         lr_attr_end_t *end = (lr_attr_end_t *)bitmap;
  121         end->lr_attr_attrs = 0;
  122         end->lr_attr_crtime[0] = 0;
  123         end->lr_attr_crtime[1] = 0;
  124         memset(end->lr_attr_scanstamp, 0, AV_SCANSTAMP_SZ);
  125 
  126         if (XVA_ISSET_REQ(xvap, XAT_READONLY))
  127                 end->lr_attr_attrs |= (xoap->xoa_readonly == 0) ? 0 :
  128                     XAT0_READONLY;
  129         if (XVA_ISSET_REQ(xvap, XAT_HIDDEN))
  130                 end->lr_attr_attrs |= (xoap->xoa_hidden == 0) ? 0 :
  131                     XAT0_HIDDEN;
  132         if (XVA_ISSET_REQ(xvap, XAT_SYSTEM))
  133                 end->lr_attr_attrs |= (xoap->xoa_system == 0) ? 0 :
  134                     XAT0_SYSTEM;
  135         if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE))
  136                 end->lr_attr_attrs |= (xoap->xoa_archive == 0) ? 0 :
  137                     XAT0_ARCHIVE;
  138         if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE))
  139                 end->lr_attr_attrs |= (xoap->xoa_immutable == 0) ? 0 :
  140                     XAT0_IMMUTABLE;
  141         if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK))
  142                 end->lr_attr_attrs |= (xoap->xoa_nounlink == 0) ? 0 :
  143                     XAT0_NOUNLINK;
  144         if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY))
  145                 end->lr_attr_attrs |= (xoap->xoa_appendonly == 0) ? 0 :
  146                     XAT0_APPENDONLY;
  147         if (XVA_ISSET_REQ(xvap, XAT_OPAQUE))
  148                 end->lr_attr_attrs |= (xoap->xoa_opaque == 0) ? 0 :
  149                     XAT0_APPENDONLY;
  150         if (XVA_ISSET_REQ(xvap, XAT_NODUMP))
  151                 end->lr_attr_attrs |= (xoap->xoa_nodump == 0) ? 0 :
  152                     XAT0_NODUMP;
  153         if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED))
  154                 end->lr_attr_attrs |= (xoap->xoa_av_quarantined == 0) ? 0 :
  155                     XAT0_AV_QUARANTINED;
  156         if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED))
  157                 end->lr_attr_attrs |= (xoap->xoa_av_modified == 0) ? 0 :
  158                     XAT0_AV_MODIFIED;
  159         if (XVA_ISSET_REQ(xvap, XAT_CREATETIME))
  160                 ZFS_TIME_ENCODE(&xoap->xoa_createtime, end->lr_attr_crtime);
  161         if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
  162                 ASSERT(!XVA_ISSET_REQ(xvap, XAT_PROJID));
  163 
  164                 memcpy(end->lr_attr_scanstamp, xoap->xoa_av_scanstamp,
  165                     AV_SCANSTAMP_SZ);
  166         } else if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
  167                 /*
  168                  * XAT_PROJID and XAT_AV_SCANSTAMP will never be valid
  169                  * at the same time, so we can share the same space.
  170                  */
  171                 memcpy(end->lr_attr_scanstamp, &xoap->xoa_projid,
  172                     sizeof (uint64_t));
  173         }
  174         if (XVA_ISSET_REQ(xvap, XAT_REPARSE))
  175                 end->lr_attr_attrs |= (xoap->xoa_reparse == 0) ? 0 :
  176                     XAT0_REPARSE;
  177         if (XVA_ISSET_REQ(xvap, XAT_OFFLINE))
  178                 end->lr_attr_attrs |= (xoap->xoa_offline == 0) ? 0 :
  179                     XAT0_OFFLINE;
  180         if (XVA_ISSET_REQ(xvap, XAT_SPARSE))
  181                 end->lr_attr_attrs |= (xoap->xoa_sparse == 0) ? 0 :
  182                     XAT0_SPARSE;
  183         if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT))
  184                 end->lr_attr_attrs |= (xoap->xoa_projinherit == 0) ? 0 :
  185                     XAT0_PROJINHERIT;
  186 }
  187 
  188 static void *
  189 zfs_log_fuid_ids(zfs_fuid_info_t *fuidp, void *start)
  190 {
  191         zfs_fuid_t *zfuid;
  192         uint64_t *fuidloc = start;
  193 
  194         /* First copy in the ACE FUIDs */
  195         for (zfuid = list_head(&fuidp->z_fuids); zfuid;
  196             zfuid = list_next(&fuidp->z_fuids, zfuid)) {
  197                 *fuidloc++ = zfuid->z_logfuid;
  198         }
  199         return (fuidloc);
  200 }
  201 
  202 
  203 static void *
  204 zfs_log_fuid_domains(zfs_fuid_info_t *fuidp, void *start)
  205 {
  206         zfs_fuid_domain_t *zdomain;
  207 
  208         /* now copy in the domain info, if any */
  209         if (fuidp->z_domain_str_sz != 0) {
  210                 for (zdomain = list_head(&fuidp->z_domains); zdomain;
  211                     zdomain = list_next(&fuidp->z_domains, zdomain)) {
  212                         memcpy(start, zdomain->z_domain,
  213                             strlen(zdomain->z_domain) + 1);
  214                         start = (caddr_t)start +
  215                             strlen(zdomain->z_domain) + 1;
  216                 }
  217         }
  218         return (start);
  219 }
  220 
  221 /*
  222  * If zp is an xattr node, check whether the xattr owner is unlinked.
  223  * We don't want to log anything if the owner is unlinked.
  224  */
  225 static int
  226 zfs_xattr_owner_unlinked(znode_t *zp)
  227 {
  228         int unlinked = 0;
  229         znode_t *dzp;
  230 #ifdef __FreeBSD__
  231         znode_t *tzp = zp;
  232 
  233         /*
  234          * zrele drops the vnode lock which violates the VOP locking contract
  235          * on FreeBSD. See comment at the top of zfs_replay.c for more detail.
  236          */
  237         /*
  238          * if zp is XATTR node, keep walking up via z_xattr_parent until we
  239          * get the owner
  240          */
  241         while (tzp->z_pflags & ZFS_XATTR) {
  242                 ASSERT3U(zp->z_xattr_parent, !=, 0);
  243                 if (zfs_zget(ZTOZSB(tzp), tzp->z_xattr_parent, &dzp) != 0) {
  244                         unlinked = 1;
  245                         break;
  246                 }
  247 
  248                 if (tzp != zp)
  249                         zrele(tzp);
  250                 tzp = dzp;
  251                 unlinked = tzp->z_unlinked;
  252         }
  253         if (tzp != zp)
  254                 zrele(tzp);
  255 #else
  256         zhold(zp);
  257         /*
  258          * if zp is XATTR node, keep walking up via z_xattr_parent until we
  259          * get the owner
  260          */
  261         while (zp->z_pflags & ZFS_XATTR) {
  262                 ASSERT3U(zp->z_xattr_parent, !=, 0);
  263                 if (zfs_zget(ZTOZSB(zp), zp->z_xattr_parent, &dzp) != 0) {
  264                         unlinked = 1;
  265                         break;
  266                 }
  267 
  268                 zrele(zp);
  269                 zp = dzp;
  270                 unlinked = zp->z_unlinked;
  271         }
  272         zrele(zp);
  273 #endif
  274         return (unlinked);
  275 }
  276 
  277 /*
  278  * Handles TX_CREATE, TX_CREATE_ATTR, TX_MKDIR, TX_MKDIR_ATTR and
  279  * TK_MKXATTR transactions.
  280  *
  281  * TX_CREATE and TX_MKDIR are standard creates, but they may have FUID
  282  * domain information appended prior to the name.  In this case the
  283  * uid/gid in the log record will be a log centric FUID.
  284  *
  285  * TX_CREATE_ACL_ATTR and TX_MKDIR_ACL_ATTR handle special creates that
  286  * may contain attributes, ACL and optional fuid information.
  287  *
  288  * TX_CREATE_ACL and TX_MKDIR_ACL handle special creates that specify
  289  * and ACL and normal users/groups in the ACEs.
  290  *
  291  * There may be an optional xvattr attribute information similar
  292  * to zfs_log_setattr.
  293  *
  294  * Also, after the file name "domain" strings may be appended.
  295  */
  296 void
  297 zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
  298     znode_t *dzp, znode_t *zp, const char *name, vsecattr_t *vsecp,
  299     zfs_fuid_info_t *fuidp, vattr_t *vap)
  300 {
  301         itx_t *itx;
  302         lr_create_t *lr;
  303         lr_acl_create_t *lracl;
  304         size_t aclsize = 0;
  305         size_t xvatsize = 0;
  306         size_t txsize;
  307         xvattr_t *xvap = (xvattr_t *)vap;
  308         void *end;
  309         size_t lrsize;
  310         size_t namesize = strlen(name) + 1;
  311         size_t fuidsz = 0;
  312 
  313         if (zil_replaying(zilog, tx) || zfs_xattr_owner_unlinked(dzp))
  314                 return;
  315 
  316         /*
  317          * If we have FUIDs present then add in space for
  318          * domains and ACE fuid's if any.
  319          */
  320         if (fuidp) {
  321                 fuidsz += fuidp->z_domain_str_sz;
  322                 fuidsz += fuidp->z_fuid_cnt * sizeof (uint64_t);
  323         }
  324 
  325         if (vap->va_mask & ATTR_XVATTR)
  326                 xvatsize = ZIL_XVAT_SIZE(xvap->xva_mapsize);
  327 
  328         if ((int)txtype == TX_CREATE_ATTR || (int)txtype == TX_MKDIR_ATTR ||
  329             (int)txtype == TX_CREATE || (int)txtype == TX_MKDIR ||
  330             (int)txtype == TX_MKXATTR) {
  331                 txsize = sizeof (*lr) + namesize + fuidsz + xvatsize;
  332                 lrsize = sizeof (*lr);
  333         } else {
  334                 txsize =
  335                     sizeof (lr_acl_create_t) + namesize + fuidsz +
  336                     ZIL_ACE_LENGTH(aclsize) + xvatsize;
  337                 lrsize = sizeof (lr_acl_create_t);
  338         }
  339 
  340         itx = zil_itx_create(txtype, txsize);
  341 
  342         lr = (lr_create_t *)&itx->itx_lr;
  343         lr->lr_doid = dzp->z_id;
  344         lr->lr_foid = zp->z_id;
  345         /* Store dnode slot count in 8 bits above object id. */
  346         LR_FOID_SET_SLOTS(lr->lr_foid, zp->z_dnodesize >> DNODE_SHIFT);
  347         lr->lr_mode = zp->z_mode;
  348         if (!IS_EPHEMERAL(KUID_TO_SUID(ZTOUID(zp)))) {
  349                 lr->lr_uid = (uint64_t)KUID_TO_SUID(ZTOUID(zp));
  350         } else {
  351                 lr->lr_uid = fuidp->z_fuid_owner;
  352         }
  353         if (!IS_EPHEMERAL(KGID_TO_SGID(ZTOGID(zp)))) {
  354                 lr->lr_gid = (uint64_t)KGID_TO_SGID(ZTOGID(zp));
  355         } else {
  356                 lr->lr_gid = fuidp->z_fuid_group;
  357         }
  358         (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &lr->lr_gen,
  359             sizeof (uint64_t));
  360         (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
  361             lr->lr_crtime, sizeof (uint64_t) * 2);
  362 
  363         if (sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(ZTOZSB(zp)), &lr->lr_rdev,
  364             sizeof (lr->lr_rdev)) != 0)
  365                 lr->lr_rdev = 0;
  366 
  367         /*
  368          * Fill in xvattr info if any
  369          */
  370         if (vap->va_mask & ATTR_XVATTR) {
  371                 zfs_log_xvattr((lr_attr_t *)((caddr_t)lr + lrsize), xvap);
  372                 end = (caddr_t)lr + lrsize + xvatsize;
  373         } else {
  374                 end = (caddr_t)lr + lrsize;
  375         }
  376 
  377         /* Now fill in any ACL info */
  378 
  379         if (vsecp) {
  380                 lracl = (lr_acl_create_t *)&itx->itx_lr;
  381                 lracl->lr_aclcnt = vsecp->vsa_aclcnt;
  382                 lracl->lr_acl_bytes = aclsize;
  383                 lracl->lr_domcnt = fuidp ? fuidp->z_domain_cnt : 0;
  384                 lracl->lr_fuidcnt  = fuidp ? fuidp->z_fuid_cnt : 0;
  385                 if (vsecp->vsa_aclflags & VSA_ACE_ACLFLAGS)
  386                         lracl->lr_acl_flags = (uint64_t)vsecp->vsa_aclflags;
  387                 else
  388                         lracl->lr_acl_flags = 0;
  389 
  390                 memcpy(end, vsecp->vsa_aclentp, aclsize);
  391                 end = (caddr_t)end + ZIL_ACE_LENGTH(aclsize);
  392         }
  393 
  394         /* drop in FUID info */
  395         if (fuidp) {
  396                 end = zfs_log_fuid_ids(fuidp, end);
  397                 end = zfs_log_fuid_domains(fuidp, end);
  398         }
  399         /*
  400          * Now place file name in log record
  401          */
  402         memcpy(end, name, namesize);
  403 
  404         zil_itx_assign(zilog, itx, tx);
  405 }
  406 
  407 /*
  408  * Handles both TX_REMOVE and TX_RMDIR transactions.
  409  */
  410 void
  411 zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
  412     znode_t *dzp, const char *name, uint64_t foid, boolean_t unlinked)
  413 {
  414         itx_t *itx;
  415         lr_remove_t *lr;
  416         size_t namesize = strlen(name) + 1;
  417 
  418         if (zil_replaying(zilog, tx) || zfs_xattr_owner_unlinked(dzp))
  419                 return;
  420 
  421         itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
  422         lr = (lr_remove_t *)&itx->itx_lr;
  423         lr->lr_doid = dzp->z_id;
  424         memcpy(lr + 1, name, namesize);
  425 
  426         itx->itx_oid = foid;
  427 
  428         /*
  429          * Object ids can be re-instantiated in the next txg so
  430          * remove any async transactions to avoid future leaks.
  431          * This can happen if a fsync occurs on the re-instantiated
  432          * object for a WR_INDIRECT or WR_NEED_COPY write, which gets
  433          * the new file data and flushes a write record for the old object.
  434          */
  435         if (unlinked) {
  436                 ASSERT((txtype & ~TX_CI) == TX_REMOVE);
  437                 zil_remove_async(zilog, foid);
  438         }
  439         zil_itx_assign(zilog, itx, tx);
  440 }
  441 
  442 /*
  443  * Handles TX_LINK transactions.
  444  */
  445 void
  446 zfs_log_link(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
  447     znode_t *dzp, znode_t *zp, const char *name)
  448 {
  449         itx_t *itx;
  450         lr_link_t *lr;
  451         size_t namesize = strlen(name) + 1;
  452 
  453         if (zil_replaying(zilog, tx))
  454                 return;
  455 
  456         itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
  457         lr = (lr_link_t *)&itx->itx_lr;
  458         lr->lr_doid = dzp->z_id;
  459         lr->lr_link_obj = zp->z_id;
  460         memcpy(lr + 1, name, namesize);
  461 
  462         zil_itx_assign(zilog, itx, tx);
  463 }
  464 
  465 /*
  466  * Handles TX_SYMLINK transactions.
  467  */
  468 void
  469 zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
  470     znode_t *dzp, znode_t *zp, const char *name, const char *link)
  471 {
  472         itx_t *itx;
  473         lr_create_t *lr;
  474         size_t namesize = strlen(name) + 1;
  475         size_t linksize = strlen(link) + 1;
  476 
  477         if (zil_replaying(zilog, tx))
  478                 return;
  479 
  480         itx = zil_itx_create(txtype, sizeof (*lr) + namesize + linksize);
  481         lr = (lr_create_t *)&itx->itx_lr;
  482         lr->lr_doid = dzp->z_id;
  483         lr->lr_foid = zp->z_id;
  484         lr->lr_uid = KUID_TO_SUID(ZTOUID(zp));
  485         lr->lr_gid = KGID_TO_SGID(ZTOGID(zp));
  486         lr->lr_mode = zp->z_mode;
  487         (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &lr->lr_gen,
  488             sizeof (uint64_t));
  489         (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
  490             lr->lr_crtime, sizeof (uint64_t) * 2);
  491         memcpy((char *)(lr + 1), name, namesize);
  492         memcpy((char *)(lr + 1) + namesize, link, linksize);
  493 
  494         zil_itx_assign(zilog, itx, tx);
  495 }
  496 
  497 static void
  498 do_zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, znode_t *sdzp,
  499     const char *sname, znode_t *tdzp, const char *dname, znode_t *szp)
  500 {
  501         itx_t *itx;
  502         lr_rename_t *lr;
  503         size_t snamesize = strlen(sname) + 1;
  504         size_t dnamesize = strlen(dname) + 1;
  505 
  506         if (zil_replaying(zilog, tx))
  507                 return;
  508 
  509         itx = zil_itx_create(txtype, sizeof (*lr) + snamesize + dnamesize);
  510         lr = (lr_rename_t *)&itx->itx_lr;
  511         lr->lr_sdoid = sdzp->z_id;
  512         lr->lr_tdoid = tdzp->z_id;
  513         memcpy((char *)(lr + 1), sname, snamesize);
  514         memcpy((char *)(lr + 1) + snamesize, dname, dnamesize);
  515         itx->itx_oid = szp->z_id;
  516 
  517         zil_itx_assign(zilog, itx, tx);
  518 }
  519 
  520 /*
  521  * Handles TX_RENAME transactions.
  522  */
  523 void
  524 zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, znode_t *sdzp,
  525     const char *sname, znode_t *tdzp, const char *dname, znode_t *szp)
  526 {
  527         txtype |= TX_RENAME;
  528         do_zfs_log_rename(zilog, tx, txtype, sdzp, sname, tdzp, dname, szp);
  529 }
  530 
  531 /*
  532  * Handles TX_RENAME_EXCHANGE transactions.
  533  */
  534 void
  535 zfs_log_rename_exchange(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
  536     znode_t *sdzp, const char *sname, znode_t *tdzp, const char *dname,
  537     znode_t *szp)
  538 {
  539         txtype |= TX_RENAME_EXCHANGE;
  540         do_zfs_log_rename(zilog, tx, txtype, sdzp, sname, tdzp, dname, szp);
  541 }
  542 
  543 /*
  544  * Handles TX_RENAME_WHITEOUT transactions.
  545  *
  546  * Unfortunately we cannot reuse do_zfs_log_rename because we we need to call
  547  * zfs_mknode() on replay which requires stashing bits as with TX_CREATE.
  548  */
  549 void
  550 zfs_log_rename_whiteout(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
  551     znode_t *sdzp, const char *sname, znode_t *tdzp, const char *dname,
  552     znode_t *szp, znode_t *wzp)
  553 {
  554         itx_t *itx;
  555         lr_rename_whiteout_t *lr;
  556         size_t snamesize = strlen(sname) + 1;
  557         size_t dnamesize = strlen(dname) + 1;
  558 
  559         if (zil_replaying(zilog, tx))
  560                 return;
  561 
  562         txtype |= TX_RENAME_WHITEOUT;
  563         itx = zil_itx_create(txtype, sizeof (*lr) + snamesize + dnamesize);
  564         lr = (lr_rename_whiteout_t *)&itx->itx_lr;
  565         lr->lr_rename.lr_sdoid = sdzp->z_id;
  566         lr->lr_rename.lr_tdoid = tdzp->z_id;
  567 
  568         /*
  569          * RENAME_WHITEOUT will create an entry at the source znode, so we need
  570          * to store the same data that the equivalent call to zfs_log_create()
  571          * would.
  572          */
  573         lr->lr_wfoid = wzp->z_id;
  574         LR_FOID_SET_SLOTS(lr->lr_wfoid, wzp->z_dnodesize >> DNODE_SHIFT);
  575         (void) sa_lookup(wzp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(wzp)), &lr->lr_wgen,
  576             sizeof (uint64_t));
  577         (void) sa_lookup(wzp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(wzp)),
  578             lr->lr_wcrtime, sizeof (uint64_t) * 2);
  579         lr->lr_wmode = wzp->z_mode;
  580         lr->lr_wuid = (uint64_t)KUID_TO_SUID(ZTOUID(wzp));
  581         lr->lr_wgid = (uint64_t)KGID_TO_SGID(ZTOGID(wzp));
  582 
  583         /*
  584          * This rdev will always be makdevice(0, 0) but because the ZIL log and
  585          * replay code needs to be platform independent (and there is no
  586          * platform independent makdev()) we need to copy the one created
  587          * during the rename operation.
  588          */
  589         (void) sa_lookup(wzp->z_sa_hdl, SA_ZPL_RDEV(ZTOZSB(wzp)), &lr->lr_wrdev,
  590             sizeof (lr->lr_wrdev));
  591 
  592         memcpy((char *)(lr + 1), sname, snamesize);
  593         memcpy((char *)(lr + 1) + snamesize, dname, dnamesize);
  594         itx->itx_oid = szp->z_id;
  595 
  596         zil_itx_assign(zilog, itx, tx);
  597 }
  598 
  599 /*
  600  * zfs_log_write() handles TX_WRITE transactions. The specified callback is
  601  * called as soon as the write is on stable storage (be it via a DMU sync or a
  602  * ZIL commit).
  603  */
  604 static int64_t zfs_immediate_write_sz = 32768;
  605 
  606 void
  607 zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype,
  608     znode_t *zp, offset_t off, ssize_t resid, int ioflag,
  609     zil_callback_t callback, void *callback_data)
  610 {
  611         dmu_buf_impl_t *db = (dmu_buf_impl_t *)sa_get_db(zp->z_sa_hdl);
  612         uint32_t blocksize = zp->z_blksz;
  613         itx_wr_state_t write_state;
  614         uintptr_t fsync_cnt;
  615         uint64_t gen = 0;
  616         ssize_t size = resid;
  617 
  618         if (zil_replaying(zilog, tx) || zp->z_unlinked ||
  619             zfs_xattr_owner_unlinked(zp)) {
  620                 if (callback != NULL)
  621                         callback(callback_data);
  622                 return;
  623         }
  624 
  625         if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
  626                 write_state = WR_INDIRECT;
  627         else if (!spa_has_slogs(zilog->zl_spa) &&
  628             resid >= zfs_immediate_write_sz)
  629                 write_state = WR_INDIRECT;
  630         else if (ioflag & (O_SYNC | O_DSYNC))
  631                 write_state = WR_COPIED;
  632         else
  633                 write_state = WR_NEED_COPY;
  634 
  635         if ((fsync_cnt = (uintptr_t)tsd_get(zfs_fsyncer_key)) != 0) {
  636                 (void) tsd_set(zfs_fsyncer_key, (void *)(fsync_cnt - 1));
  637         }
  638 
  639         (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &gen,
  640             sizeof (gen));
  641 
  642         while (resid) {
  643                 itx_t *itx;
  644                 lr_write_t *lr;
  645                 itx_wr_state_t wr_state = write_state;
  646                 ssize_t len = resid;
  647 
  648                 /*
  649                  * A WR_COPIED record must fit entirely in one log block.
  650                  * Large writes can use WR_NEED_COPY, which the ZIL will
  651                  * split into multiple records across several log blocks
  652                  * if necessary.
  653                  */
  654                 if (wr_state == WR_COPIED &&
  655                     resid > zil_max_copied_data(zilog))
  656                         wr_state = WR_NEED_COPY;
  657                 else if (wr_state == WR_INDIRECT)
  658                         len = MIN(blocksize - P2PHASE(off, blocksize), resid);
  659 
  660                 itx = zil_itx_create(txtype, sizeof (*lr) +
  661                     (wr_state == WR_COPIED ? len : 0));
  662                 lr = (lr_write_t *)&itx->itx_lr;
  663 
  664                 /*
  665                  * For WR_COPIED records, copy the data into the lr_write_t.
  666                  */
  667                 if (wr_state == WR_COPIED) {
  668                         int err;
  669                         DB_DNODE_ENTER(db);
  670                         err = dmu_read_by_dnode(DB_DNODE(db), off, len, lr + 1,
  671                             DMU_READ_NO_PREFETCH);
  672                         if (err != 0) {
  673                                 zil_itx_destroy(itx);
  674                                 itx = zil_itx_create(txtype, sizeof (*lr));
  675                                 lr = (lr_write_t *)&itx->itx_lr;
  676                                 wr_state = WR_NEED_COPY;
  677                         }
  678                         DB_DNODE_EXIT(db);
  679                 }
  680 
  681                 itx->itx_wr_state = wr_state;
  682                 lr->lr_foid = zp->z_id;
  683                 lr->lr_offset = off;
  684                 lr->lr_length = len;
  685                 lr->lr_blkoff = 0;
  686                 BP_ZERO(&lr->lr_blkptr);
  687 
  688                 itx->itx_private = ZTOZSB(zp);
  689                 itx->itx_gen = gen;
  690 
  691                 if (!(ioflag & (O_SYNC | O_DSYNC)) && (zp->z_sync_cnt == 0) &&
  692                     (fsync_cnt == 0))
  693                         itx->itx_sync = B_FALSE;
  694 
  695                 itx->itx_callback = callback;
  696                 itx->itx_callback_data = callback_data;
  697                 zil_itx_assign(zilog, itx, tx);
  698 
  699                 off += len;
  700                 resid -= len;
  701         }
  702 
  703         if (write_state == WR_COPIED || write_state == WR_NEED_COPY) {
  704                 dsl_pool_wrlog_count(zilog->zl_dmu_pool, size, tx->tx_txg);
  705         }
  706 }
  707 
  708 /*
  709  * Handles TX_TRUNCATE transactions.
  710  */
  711 void
  712 zfs_log_truncate(zilog_t *zilog, dmu_tx_t *tx, int txtype,
  713     znode_t *zp, uint64_t off, uint64_t len)
  714 {
  715         itx_t *itx;
  716         lr_truncate_t *lr;
  717 
  718         if (zil_replaying(zilog, tx) || zp->z_unlinked ||
  719             zfs_xattr_owner_unlinked(zp))
  720                 return;
  721 
  722         itx = zil_itx_create(txtype, sizeof (*lr));
  723         lr = (lr_truncate_t *)&itx->itx_lr;
  724         lr->lr_foid = zp->z_id;
  725         lr->lr_offset = off;
  726         lr->lr_length = len;
  727 
  728         itx->itx_sync = (zp->z_sync_cnt != 0);
  729         zil_itx_assign(zilog, itx, tx);
  730 }
  731 
  732 /*
  733  * Handles TX_SETATTR transactions.
  734  */
  735 void
  736 zfs_log_setattr(zilog_t *zilog, dmu_tx_t *tx, int txtype,
  737     znode_t *zp, vattr_t *vap, uint_t mask_applied, zfs_fuid_info_t *fuidp)
  738 {
  739         itx_t           *itx;
  740         lr_setattr_t    *lr;
  741         xvattr_t        *xvap = (xvattr_t *)vap;
  742         size_t          recsize = sizeof (lr_setattr_t);
  743         void            *start;
  744 
  745         if (zil_replaying(zilog, tx) || zp->z_unlinked)
  746                 return;
  747 
  748         /*
  749          * If XVATTR set, then log record size needs to allow
  750          * for lr_attr_t + xvattr mask, mapsize and create time
  751          * plus actual attribute values
  752          */
  753         if (vap->va_mask & ATTR_XVATTR)
  754                 recsize = sizeof (*lr) + ZIL_XVAT_SIZE(xvap->xva_mapsize);
  755 
  756         if (fuidp)
  757                 recsize += fuidp->z_domain_str_sz;
  758 
  759         itx = zil_itx_create(txtype, recsize);
  760         lr = (lr_setattr_t *)&itx->itx_lr;
  761         lr->lr_foid = zp->z_id;
  762         lr->lr_mask = (uint64_t)mask_applied;
  763         lr->lr_mode = (uint64_t)vap->va_mode;
  764         if ((mask_applied & ATTR_UID) && IS_EPHEMERAL(vap->va_uid))
  765                 lr->lr_uid = fuidp->z_fuid_owner;
  766         else
  767                 lr->lr_uid = (uint64_t)vap->va_uid;
  768 
  769         if ((mask_applied & ATTR_GID) && IS_EPHEMERAL(vap->va_gid))
  770                 lr->lr_gid = fuidp->z_fuid_group;
  771         else
  772                 lr->lr_gid = (uint64_t)vap->va_gid;
  773 
  774         lr->lr_size = (uint64_t)vap->va_size;
  775         ZFS_TIME_ENCODE(&vap->va_atime, lr->lr_atime);
  776         ZFS_TIME_ENCODE(&vap->va_mtime, lr->lr_mtime);
  777         start = (lr_setattr_t *)(lr + 1);
  778         if (vap->va_mask & ATTR_XVATTR) {
  779                 zfs_log_xvattr((lr_attr_t *)start, xvap);
  780                 start = (caddr_t)start + ZIL_XVAT_SIZE(xvap->xva_mapsize);
  781         }
  782 
  783         /*
  784          * Now stick on domain information if any on end
  785          */
  786 
  787         if (fuidp)
  788                 (void) zfs_log_fuid_domains(fuidp, start);
  789 
  790         itx->itx_sync = (zp->z_sync_cnt != 0);
  791         zil_itx_assign(zilog, itx, tx);
  792 }
  793 
  794 /*
  795  * Handles TX_SETSAXATTR transactions.
  796  */
  797 void
  798 zfs_log_setsaxattr(zilog_t *zilog, dmu_tx_t *tx, int txtype,
  799     znode_t *zp, const char *name, const void *value, size_t size)
  800 {
  801         itx_t           *itx;
  802         lr_setsaxattr_t *lr;
  803         size_t          recsize = sizeof (lr_setsaxattr_t);
  804         void            *xattrstart;
  805         int             namelen;
  806 
  807         if (zil_replaying(zilog, tx) || zp->z_unlinked)
  808                 return;
  809 
  810         namelen = strlen(name) + 1;
  811         recsize += (namelen + size);
  812         itx = zil_itx_create(txtype, recsize);
  813         lr = (lr_setsaxattr_t *)&itx->itx_lr;
  814         lr->lr_foid = zp->z_id;
  815         xattrstart = (char *)(lr + 1);
  816         memcpy(xattrstart, name, namelen);
  817         if (value != NULL) {
  818                 memcpy((char *)xattrstart + namelen, value, size);
  819                 lr->lr_size = size;
  820         } else {
  821                 lr->lr_size = 0;
  822         }
  823 
  824         itx->itx_sync = (zp->z_sync_cnt != 0);
  825         zil_itx_assign(zilog, itx, tx);
  826 }
  827 
  828 /*
  829  * Handles TX_ACL transactions.
  830  */
  831 void
  832 zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, znode_t *zp,
  833     vsecattr_t *vsecp, zfs_fuid_info_t *fuidp)
  834 {
  835         itx_t *itx;
  836         lr_acl_v0_t *lrv0;
  837         lr_acl_t *lr;
  838         int txtype;
  839         int lrsize;
  840         size_t txsize;
  841         size_t aclbytes = vsecp->vsa_aclentsz;
  842 
  843         if (zil_replaying(zilog, tx) || zp->z_unlinked)
  844                 return;
  845 
  846         txtype = (ZTOZSB(zp)->z_version < ZPL_VERSION_FUID) ?
  847             TX_ACL_V0 : TX_ACL;
  848 
  849         if (txtype == TX_ACL)
  850                 lrsize = sizeof (*lr);
  851         else
  852                 lrsize = sizeof (*lrv0);
  853 
  854         txsize = lrsize +
  855             ((txtype == TX_ACL) ? ZIL_ACE_LENGTH(aclbytes) : aclbytes) +
  856             (fuidp ? fuidp->z_domain_str_sz : 0) +
  857             sizeof (uint64_t) * (fuidp ? fuidp->z_fuid_cnt : 0);
  858 
  859         itx = zil_itx_create(txtype, txsize);
  860 
  861         lr = (lr_acl_t *)&itx->itx_lr;
  862         lr->lr_foid = zp->z_id;
  863         if (txtype == TX_ACL) {
  864                 lr->lr_acl_bytes = aclbytes;
  865                 lr->lr_domcnt = fuidp ? fuidp->z_domain_cnt : 0;
  866                 lr->lr_fuidcnt = fuidp ? fuidp->z_fuid_cnt : 0;
  867                 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS)
  868                         lr->lr_acl_flags = (uint64_t)vsecp->vsa_aclflags;
  869                 else
  870                         lr->lr_acl_flags = 0;
  871         }
  872         lr->lr_aclcnt = (uint64_t)vsecp->vsa_aclcnt;
  873 
  874         if (txtype == TX_ACL_V0) {
  875                 lrv0 = (lr_acl_v0_t *)lr;
  876                 memcpy(lrv0 + 1, vsecp->vsa_aclentp, aclbytes);
  877         } else {
  878                 void *start = (ace_t *)(lr + 1);
  879 
  880                 memcpy(start, vsecp->vsa_aclentp, aclbytes);
  881 
  882                 start = (caddr_t)start + ZIL_ACE_LENGTH(aclbytes);
  883 
  884                 if (fuidp) {
  885                         start = zfs_log_fuid_ids(fuidp, start);
  886                         (void) zfs_log_fuid_domains(fuidp, start);
  887                 }
  888         }
  889 
  890         itx->itx_sync = (zp->z_sync_cnt != 0);
  891         zil_itx_assign(zilog, itx, tx);
  892 }
  893 
  894 ZFS_MODULE_PARAM(zfs, zfs_, immediate_write_sz, S64, ZMOD_RW,
  895         "Largest data block to write to zil");
Cache object: f931ea1ad319eec41b12d544b80d9500
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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/zfs/zfs_log.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/zfs/zfs_log.c
