usr/src/uts/common/fs/zfs/zfs_sa.c

   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 http://www.opensolaris.org/os/licensing.
  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) 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #include <sys/zfs_context.h>
  26 #include <sys/vnode.h>
  27 #include <sys/sa.h>
  28 #include <sys/zfs_acl.h>
  29 #include <sys/zfs_sa.h>
  30 #include <sys/dmu_objset.h>
  31 #include <sys/sa_impl.h>
  32
  33 /*
  34  * ZPL attribute registration table.
  35  * Order of attributes doesn't matter
  36  * a unique value will be assigned for each
  37  * attribute that is file system specific
  38  *
  39  * This is just the set of ZPL attributes that this
  40  * version of ZFS deals with natively.  The file system
  41  * could have other attributes stored in files, but they will be
  42  * ignored.  The SA framework will preserve them, just that
  43  * this version of ZFS won't change or delete them.
  44  */
  45
  46 sa_attr_reg_t zfs_attr_table[ZPL_END+1] = {
  47         {"ZPL_ATIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 0},
  48         {"ZPL_MTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 1},
  49         {"ZPL_CTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 2},
  50         {"ZPL_CRTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 3},
  51         {"ZPL_GEN", sizeof (uint64_t), SA_UINT64_ARRAY, 4},
  52         {"ZPL_MODE", sizeof (uint64_t), SA_UINT64_ARRAY, 5},
  53         {"ZPL_SIZE", sizeof (uint64_t), SA_UINT64_ARRAY, 6},
  54         {"ZPL_PARENT", sizeof (uint64_t), SA_UINT64_ARRAY, 7},
  55         {"ZPL_LINKS", sizeof (uint64_t), SA_UINT64_ARRAY, 8},
  56         {"ZPL_XATTR", sizeof (uint64_t), SA_UINT64_ARRAY, 9},
  57         {"ZPL_RDEV", sizeof (uint64_t), SA_UINT64_ARRAY, 10},
  58         {"ZPL_FLAGS", sizeof (uint64_t), SA_UINT64_ARRAY, 11},
  59         {"ZPL_UID", sizeof (uint64_t), SA_UINT64_ARRAY, 12},
  60         {"ZPL_GID", sizeof (uint64_t), SA_UINT64_ARRAY, 13},
  61         {"ZPL_PAD", sizeof (uint64_t) * 4, SA_UINT64_ARRAY, 14},
  62         {"ZPL_ZNODE_ACL", 88, SA_UINT8_ARRAY, 15},
  63         {"ZPL_DACL_COUNT", sizeof (uint64_t), SA_UINT64_ARRAY, 0},
  64         {"ZPL_SYMLINK", 0, SA_UINT8_ARRAY, 0},
  65         {"ZPL_SCANSTAMP", 32, SA_UINT8_ARRAY, 0},
  66         {"ZPL_DACL_ACES", 0, SA_ACL, 0},
  67         {"ZPL_PROJID", sizeof (uint64_t), SA_UINT64_ARRAY, 0},
  68         {NULL, 0, 0, 0}
  69 };
  70
  71 #ifdef _KERNEL
  72
  73 int
  74 zfs_sa_readlink(znode_t *zp, uio_t *uio)
  75 {
  76         dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
  77         size_t bufsz;
  78         int error;
  79
  80         bufsz = zp->z_size;
  81         if (bufsz + ZFS_OLD_ZNODE_PHYS_SIZE <= db->db_size) {
  82                 error = uiomove((caddr_t)db->db_data +
  83                     ZFS_OLD_ZNODE_PHYS_SIZE,
  84                     MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio);
  85         } else {
  86                 dmu_buf_t *dbp;
  87                 if ((error = dmu_buf_hold(zp->z_zfsvfs->z_os, zp->z_id,
  88                     0, FTAG, &dbp, DMU_READ_NO_PREFETCH)) == 0) {
  89                         error = uiomove(dbp->db_data,
  90                             MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio);
  91                         dmu_buf_rele(dbp, FTAG);
  92                 }
  93         }
  94         return (error);
  95 }
  96
  97 void
  98 zfs_sa_symlink(znode_t *zp, char *link, int len, dmu_tx_t *tx)
  99 {
 100         dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
 101
 102         if (ZFS_OLD_ZNODE_PHYS_SIZE + len <= dmu_bonus_max()) {
 103                 VERIFY0(dmu_set_bonus(db, len + ZFS_OLD_ZNODE_PHYS_SIZE, tx));
 104                 if (len) {
 105                         bcopy(link, (caddr_t)db->db_data +
 106                             ZFS_OLD_ZNODE_PHYS_SIZE, len);
 107                 }
 108         } else {
 109                 dmu_buf_t *dbp;
 110
 111                 zfs_grow_blocksize(zp, len, tx);
 112                 VERIFY(0 == dmu_buf_hold(zp->z_zfsvfs->z_os,
 113                     zp->z_id, 0, FTAG, &dbp, DMU_READ_NO_PREFETCH));
 114
 115                 dmu_buf_will_dirty(dbp, tx);
 116
 117                 ASSERT3U(len, <=, dbp->db_size);
 118                 bcopy(link, dbp->db_data, len);
 119                 dmu_buf_rele(dbp, FTAG);
 120         }
 121 }
 122
 123 void
 124 zfs_sa_get_scanstamp(znode_t *zp, xvattr_t *xvap)
 125 {
 126         zfsvfs_t *zfsvfs = zp->z_zfsvfs;
 127         xoptattr_t *xoap;
 128
 129         ASSERT(MUTEX_HELD(&zp->z_lock));
 130         VERIFY((xoap = xva_getxoptattr(xvap)) != NULL);
 131         if (zp->z_is_sa) {
 132                 if (sa_lookup(zp->z_sa_hdl, SA_ZPL_SCANSTAMP(zfsvfs),
 133                     &xoap->xoa_av_scanstamp,
 134                     sizeof (xoap->xoa_av_scanstamp)) != 0)
 135                         return;
 136         } else {
 137                 dmu_object_info_t doi;
 138                 dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
 139                 int len;
 140
 141                 if (!(zp->z_pflags & ZFS_BONUS_SCANSTAMP))
 142                         return;
 143
 144                 sa_object_info(zp->z_sa_hdl, &doi);
 145                 len = sizeof (xoap->xoa_av_scanstamp) +
 146                     ZFS_OLD_ZNODE_PHYS_SIZE;
 147
 148                 if (len <= doi.doi_bonus_size) {
 149                         (void) memcpy(xoap->xoa_av_scanstamp,
 150                             (caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
 151                             sizeof (xoap->xoa_av_scanstamp));
 152                 }
 153         }
 154         XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
 155 }
 156
 157 void
 158 zfs_sa_set_scanstamp(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
 159 {
 160         zfsvfs_t *zfsvfs = zp->z_zfsvfs;
 161         xoptattr_t *xoap;
 162
 163         ASSERT(MUTEX_HELD(&zp->z_lock));
 164         VERIFY((xoap = xva_getxoptattr(xvap)) != NULL);
 165         if (zp->z_is_sa)
 166                 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SCANSTAMP(zfsvfs),
 167                     &xoap->xoa_av_scanstamp,
 168                     sizeof (xoap->xoa_av_scanstamp), tx));
 169         else {
 170                 dmu_object_info_t doi;
 171                 dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
 172                 int len;
 173
 174                 sa_object_info(zp->z_sa_hdl, &doi);
 175                 len = sizeof (xoap->xoa_av_scanstamp) +
 176                     ZFS_OLD_ZNODE_PHYS_SIZE;
 177                 if (len > doi.doi_bonus_size)
 178                         VERIFY(dmu_set_bonus(db, len, tx) == 0);
 179                 (void) memcpy((caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
 180                     xoap->xoa_av_scanstamp, sizeof (xoap->xoa_av_scanstamp));
 181
 182                 zp->z_pflags |= ZFS_BONUS_SCANSTAMP;
 183                 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
 184                     &zp->z_pflags, sizeof (uint64_t), tx));
 185         }
 186 }
 187
 188 /*
 189  * I'm not convinced we should do any of this upgrade.
 190  * since the SA code can read both old/new znode formats
 191  * with probably little to no performance difference.
 192  *
 193  * All new files will be created with the new format.
 194  */
 195
 196 void
 197 zfs_sa_upgrade(sa_handle_t *hdl, dmu_tx_t *tx)
 198 {
 199         dmu_buf_t *db = sa_get_db(hdl);
 200         znode_t *zp = sa_get_userdata(hdl);
 201         zfsvfs_t *zfsvfs = zp->z_zfsvfs;
 202         sa_bulk_attr_t bulk[22];
 203         int count = 0;
 204         sa_bulk_attr_t sa_attrs[20] = { 0 };
 205         zfs_acl_locator_cb_t locate = { 0 };
 206         uint64_t uid, gid, mode, rdev, xattr, parent;
 207         uint64_t crtime[2], mtime[2], ctime[2];
 208         zfs_acl_phys_t znode_acl;
 209         char scanstamp[AV_SCANSTAMP_SZ];
 210         boolean_t drop_lock = B_FALSE;
 211
 212         /*
 213          * No upgrade if ACL isn't cached
 214          * since we won't know which locks are held
 215          * and ready the ACL would require special "locked"
 216          * interfaces that would be messy
 217          */
 218         if (zp->z_acl_cached == NULL || ZTOV(zp)->v_type == VLNK)
 219                 return;
 220
 221         /*
 222          * If the z_lock is held and we aren't the owner
 223          * the just return since we don't want to deadlock
 224          * trying to update the status of z_is_sa.  This
 225          * file can then be upgraded at a later time.
 226          *
 227          * Otherwise, we know we are doing the
 228          * sa_update() that caused us to enter this function.
 229          */
 230         if (mutex_owner(&zp->z_lock) != curthread) {
 231                 if (mutex_tryenter(&zp->z_lock) == 0)
 232                         return;
 233                 else
 234                         drop_lock = B_TRUE;
 235         }
 236
 237         /* First do a bulk query of the attributes that aren't cached */
 238         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
 239         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
 240         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &crtime, 16);
 241         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
 242         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8);
 243         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_XATTR(zfsvfs), NULL, &xattr, 8);
 244         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_RDEV(zfsvfs), NULL, &rdev, 8);
 245         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, &uid, 8);
 246         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, &gid, 8);
 247         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
 248             &znode_acl, 88);
 249
 250         if (sa_bulk_lookup_locked(hdl, bulk, count) != 0)
 251                 goto done;
 252
 253         if (dmu_objset_projectquota_enabled(hdl->sa_os) &&
 254             !(zp->z_pflags & ZFS_PROJID)) {
 255                 zp->z_pflags |= ZFS_PROJID;
 256                 zp->z_projid = ZFS_DEFAULT_PROJID;
 257         }
 258
 259         /*
 260          * While the order here doesn't matter its best to try and organize
 261          * it is such a way to pick up an already existing layout number
 262          */
 263         count = 0;
 264         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
 265         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_SIZE(zfsvfs), NULL,
 266             &zp->z_size, 8);
 267         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_GEN(zfsvfs),
 268             NULL, &zp->z_gen, 8);
 269         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_UID(zfsvfs), NULL, &uid, 8);
 270         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_GID(zfsvfs), NULL, &gid, 8);
 271         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_PARENT(zfsvfs),
 272             NULL, &parent, 8);
 273         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_FLAGS(zfsvfs), NULL,
 274             &zp->z_pflags, 8);
 275         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_ATIME(zfsvfs), NULL,
 276             zp->z_atime, 16);
 277         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_MTIME(zfsvfs), NULL,
 278             &mtime, 16);
 279         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_CTIME(zfsvfs), NULL,
 280             &ctime, 16);
 281         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_CRTIME(zfsvfs), NULL,
 282             &crtime, 16);
 283         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_LINKS(zfsvfs), NULL,
 284             &zp->z_links, 8);
 285         if (dmu_objset_projectquota_enabled(hdl->sa_os))
 286                 SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_PROJID(zfsvfs), NULL,
 287                     &zp->z_projid, 8);
 288         if (zp->z_vnode->v_type == VBLK || zp->z_vnode->v_type == VCHR)
 289                 SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_RDEV(zfsvfs), NULL,
 290                     &rdev, 8);
 291         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
 292             &zp->z_acl_cached->z_acl_count, 8);
 293
 294         if (zp->z_acl_cached->z_version < ZFS_ACL_VERSION_FUID)
 295                 zfs_acl_xform(zp, zp->z_acl_cached, CRED());
 296
 297         locate.cb_aclp = zp->z_acl_cached;
 298         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_DACL_ACES(zfsvfs),
 299             zfs_acl_data_locator, &locate, zp->z_acl_cached->z_acl_bytes);
 300
 301         if (xattr)
 302                 SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_XATTR(zfsvfs),
 303                     NULL, &xattr, 8);
 304
 305         /* if scanstamp then add scanstamp */
 306
 307         if (zp->z_pflags & ZFS_BONUS_SCANSTAMP) {
 308                 bcopy((caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
 309                     scanstamp, AV_SCANSTAMP_SZ);
 310                 SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_SCANSTAMP(zfsvfs),
 311                     NULL, scanstamp, AV_SCANSTAMP_SZ);
 312                 zp->z_pflags &= ~ZFS_BONUS_SCANSTAMP;
 313         }
 314
 315         VERIFY(dmu_set_bonustype(db, DMU_OT_SA, tx) == 0);
 316         VERIFY(sa_replace_all_by_template_locked(hdl, sa_attrs,
 317             count, tx) == 0);
 318         if (znode_acl.z_acl_extern_obj)
 319                 VERIFY(0 == dmu_object_free(zfsvfs->z_os,
 320                     znode_acl.z_acl_extern_obj, tx));
 321
 322         zp->z_is_sa = B_TRUE;
 323 done:
 324         if (drop_lock)
 325                 mutex_exit(&zp->z_lock);
 326 }
 327
 328 void
 329 zfs_sa_upgrade_txholds(dmu_tx_t *tx, znode_t *zp)
 330 {
 331         if (!zp->z_zfsvfs->z_use_sa || zp->z_is_sa)
 332                 return;
 333
 334
 335         dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
 336
 337         if (zfs_external_acl(zp)) {
 338                 dmu_tx_hold_free(tx, zfs_external_acl(zp), 0,
 339                     DMU_OBJECT_END);
 340         }
 341 }
 342
 343 #endif