module/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_DXATTR", 0, SA_UINT8_ARRAY, 0},
  68         {"ZPL_PROJID", sizeof (uint64_t), SA_UINT64_ARRAY, 0},
  69         {NULL, 0, 0, 0}
  70 };
  71
  72 #ifdef _KERNEL
  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(ZTOZSB(zp)->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                 VERIFY0(dmu_buf_hold(ZTOZSB(zp)->z_os, zp->z_id, 0, FTAG, &dbp,
 113                     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 = ZTOZSB(zp);
 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 = ZTOZSB(zp);
 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 int
 189 zfs_sa_get_xattr(znode_t *zp)
 190 {
 191         zfsvfs_t *zfsvfs = ZTOZSB(zp);
 192         char *obj;
 193         int size;
 194         int error;
 195
 196         ASSERT(RW_LOCK_HELD(&zp->z_xattr_lock));
 197         ASSERT(!zp->z_xattr_cached);
 198         ASSERT(zp->z_is_sa);
 199
 200         error = sa_size(zp->z_sa_hdl, SA_ZPL_DXATTR(zfsvfs), &size);
 201         if (error) {
 202                 if (error == ENOENT)
 203                         return nvlist_alloc(&zp->z_xattr_cached,
 204                             NV_UNIQUE_NAME, KM_SLEEP);
 205                 else
 206                         return (error);
 207         }
 208
 209         obj = vmem_alloc(size, KM_SLEEP);
 210
 211         error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DXATTR(zfsvfs), obj, size);
 212         if (error == 0)
 213                 error = nvlist_unpack(obj, size, &zp->z_xattr_cached, KM_SLEEP);
 214
 215         vmem_free(obj, size);
 216
 217         return (error);
 218 }
 219
 220 int
 221 zfs_sa_set_xattr(znode_t *zp)
 222 {
 223         zfsvfs_t *zfsvfs = ZTOZSB(zp);
 224         dmu_tx_t *tx;
 225         char *obj;
 226         size_t size;
 227         int error;
 228
 229         ASSERT(RW_WRITE_HELD(&zp->z_xattr_lock));
 230         ASSERT(zp->z_xattr_cached);
 231         ASSERT(zp->z_is_sa);
 232
 233         error = nvlist_size(zp->z_xattr_cached, &size, NV_ENCODE_XDR);
 234         if ((error == 0) && (size > SA_ATTR_MAX_LEN))
 235                 error = SET_ERROR(EFBIG);
 236         if (error)
 237                 goto out;
 238
 239         obj = vmem_alloc(size, KM_SLEEP);
 240
 241         error = nvlist_pack(zp->z_xattr_cached, &obj, &size,
 242             NV_ENCODE_XDR, KM_SLEEP);
 243         if (error)
 244                 goto out_free;
 245
 246         tx = dmu_tx_create(zfsvfs->z_os);
 247         dmu_tx_hold_sa_create(tx, size);
 248         dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
 249
 250         error = dmu_tx_assign(tx, TXG_WAIT);
 251         if (error) {
 252                 dmu_tx_abort(tx);
 253         } else {
 254                 int count = 0;
 255                 sa_bulk_attr_t bulk[2];
 256                 uint64_t ctime[2];
 257
 258                 zfs_tstamp_update_setup(zp, STATE_CHANGED, NULL, ctime);
 259                 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DXATTR(zfsvfs),
 260                     NULL, obj, size);
 261                 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
 262                     NULL, &ctime, 16);
 263                 VERIFY0(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
 264
 265                 dmu_tx_commit(tx);
 266         }
 267 out_free:
 268         vmem_free(obj, size);
 269 out:
 270         return (error);
 271 }
 272
 273 /*
 274  * I'm not convinced we should do any of this upgrade.
 275  * since the SA code can read both old/new znode formats
 276  * with probably little to no performance difference.
 277  *
 278  * All new files will be created with the new format.
 279  */
 280
 281 void
 282 zfs_sa_upgrade(sa_handle_t *hdl, dmu_tx_t *tx)
 283 {
 284         dmu_buf_t *db = sa_get_db(hdl);
 285         znode_t *zp = sa_get_userdata(hdl);
 286         zfsvfs_t *zfsvfs = ZTOZSB(zp);
 287         int count = 0;
 288         sa_bulk_attr_t *bulk, *sa_attrs;
 289         zfs_acl_locator_cb_t locate = { 0 };
 290         uint64_t uid, gid, mode, rdev, xattr, parent, tmp_gen;
 291         uint64_t crtime[2], mtime[2], ctime[2], atime[2];
 292         uint64_t links;
 293         zfs_acl_phys_t znode_acl;
 294         char scanstamp[AV_SCANSTAMP_SZ];
 295         boolean_t drop_lock = B_FALSE;
 296
 297         /*
 298          * No upgrade if ACL isn't cached
 299          * since we won't know which locks are held
 300          * and ready the ACL would require special "locked"
 301          * interfaces that would be messy
 302          */
 303         if (zp->z_acl_cached == NULL || S_ISLNK(ZTOI(zp)->i_mode))
 304                 return;
 305
 306         /*
 307          * If the z_lock is held and we aren't the owner
 308          * the just return since we don't want to deadlock
 309          * trying to update the status of z_is_sa.  This
 310          * file can then be upgraded at a later time.
 311          *
 312          * Otherwise, we know we are doing the
 313          * sa_update() that caused us to enter this function.
 314          */
 315         if (MUTEX_NOT_HELD(&zp->z_lock)) {
 316                 if (mutex_tryenter(&zp->z_lock) == 0)
 317                         return;
 318                 else
 319                         drop_lock = B_TRUE;
 320         }
 321
 322         /* First do a bulk query of the attributes that aren't cached */
 323         bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * ZPL_END, KM_SLEEP);
 324         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
 325         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
 326         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
 327         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &crtime, 16);
 328         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
 329         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8);
 330         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_XATTR(zfsvfs), NULL, &xattr, 8);
 331         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_RDEV(zfsvfs), NULL, &rdev, 8);
 332         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, &uid, 8);
 333         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, &gid, 8);
 334         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &tmp_gen, 8);
 335         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
 336             &znode_acl, 88);
 337
 338         if (sa_bulk_lookup_locked(hdl, bulk, count) != 0)
 339                 goto done;
 340
 341         if (dmu_objset_projectquota_enabled(hdl->sa_os) &&
 342             !(zp->z_pflags & ZFS_PROJID)) {
 343                 zp->z_pflags |= ZFS_PROJID;
 344                 zp->z_projid = ZFS_DEFAULT_PROJID;
 345         }
 346
 347         /*
 348          * While the order here doesn't matter its best to try and organize
 349          * it is such a way to pick up an already existing layout number
 350          */
 351         count = 0;
 352         sa_attrs = kmem_zalloc(sizeof (sa_bulk_attr_t) * ZPL_END, KM_SLEEP);
 353         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
 354         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_SIZE(zfsvfs), NULL,
 355             &zp->z_size, 8);
 356         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_GEN(zfsvfs),
 357             NULL, &tmp_gen, 8);
 358         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_UID(zfsvfs), NULL, &uid, 8);
 359         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_GID(zfsvfs), NULL, &gid, 8);
 360         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_PARENT(zfsvfs),
 361             NULL, &parent, 8);
 362         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_FLAGS(zfsvfs), NULL,
 363             &zp->z_pflags, 8);
 364         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_ATIME(zfsvfs), NULL,
 365             &atime, 16);
 366         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_MTIME(zfsvfs), NULL,
 367             &mtime, 16);
 368         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_CTIME(zfsvfs), NULL,
 369             &ctime, 16);
 370         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_CRTIME(zfsvfs), NULL,
 371             &crtime, 16);
 372         links = ZTOI(zp)->i_nlink;
 373         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_LINKS(zfsvfs), NULL,
 374             &links, 8);
 375         if (dmu_objset_projectquota_enabled(hdl->sa_os))
 376                 SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_PROJID(zfsvfs), NULL,
 377                     &zp->z_projid, 8);
 378         if (S_ISBLK(ZTOI(zp)->i_mode) || S_ISCHR(ZTOI(zp)->i_mode))
 379                 SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_RDEV(zfsvfs), NULL,
 380                     &rdev, 8);
 381         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
 382             &zp->z_acl_cached->z_acl_count, 8);
 383
 384         if (zp->z_acl_cached->z_version < ZFS_ACL_VERSION_FUID)
 385                 zfs_acl_xform(zp, zp->z_acl_cached, CRED());
 386
 387         locate.cb_aclp = zp->z_acl_cached;
 388         SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_DACL_ACES(zfsvfs),
 389             zfs_acl_data_locator, &locate, zp->z_acl_cached->z_acl_bytes);
 390
 391         if (xattr)
 392                 SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_XATTR(zfsvfs),
 393                     NULL, &xattr, 8);
 394
 395         /* if scanstamp then add scanstamp */
 396
 397         if (zp->z_pflags & ZFS_BONUS_SCANSTAMP) {
 398                 bcopy((caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
 399                     scanstamp, AV_SCANSTAMP_SZ);
 400                 SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_SCANSTAMP(zfsvfs),
 401                     NULL, scanstamp, AV_SCANSTAMP_SZ);
 402                 zp->z_pflags &= ~ZFS_BONUS_SCANSTAMP;
 403         }
 404
 405         VERIFY(dmu_set_bonustype(db, DMU_OT_SA, tx) == 0);
 406         VERIFY(sa_replace_all_by_template_locked(hdl, sa_attrs,
 407             count, tx) == 0);
 408         if (znode_acl.z_acl_extern_obj)
 409                 VERIFY(0 == dmu_object_free(zfsvfs->z_os,
 410                     znode_acl.z_acl_extern_obj, tx));
 411
 412         zp->z_is_sa = B_TRUE;
 413         kmem_free(sa_attrs, sizeof (sa_bulk_attr_t) * ZPL_END);
 414 done:
 415         kmem_free(bulk, sizeof (sa_bulk_attr_t) * ZPL_END);
 416         if (drop_lock)
 417                 mutex_exit(&zp->z_lock);
 418 }
 419
 420 void
 421 zfs_sa_upgrade_txholds(dmu_tx_t *tx, znode_t *zp)
 422 {
 423         if (!ZTOZSB(zp)->z_use_sa || zp->z_is_sa)
 424                 return;
 425
 426
 427         dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
 428
 429         if (zfs_external_acl(zp)) {
 430                 dmu_tx_hold_free(tx, zfs_external_acl(zp), 0,
 431                     DMU_OBJECT_END);
 432         }
 433 }
 434
 435 EXPORT_SYMBOL(zfs_attr_table);
 436 EXPORT_SYMBOL(zfs_sa_readlink);
 437 EXPORT_SYMBOL(zfs_sa_symlink);
 438 EXPORT_SYMBOL(zfs_sa_get_scanstamp);
 439 EXPORT_SYMBOL(zfs_sa_set_scanstamp);
 440 EXPORT_SYMBOL(zfs_sa_get_xattr);
 441 EXPORT_SYMBOL(zfs_sa_set_xattr);
 442 EXPORT_SYMBOL(zfs_sa_upgrade);
 443 EXPORT_SYMBOL(zfs_sa_upgrade_txholds);
 444
 445 #endif