Finally... Import the latest open-source ZFS version - (SPA) 28.

Few new things available from now on:

- Data deduplication.
- Triple parity RAIDZ (RAIDZ3).
- zfs diff.
- zpool split.
- Snapshot holds.
- zpool import -F. Allows to rewind corrupted pool to earlier
  transaction group.
- Possibility to import pool in read-only mode.

MFC after:	1 month

1 files changed, 334 insertions, 0 deletions

diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_sa.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_sa.c
new file mode 100644
index 0000000..d141e43
--- /dev/null
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_sa.c
@@ -0,0 +1,334 @@
+/*
+ * 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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/vnode.h>
+#include <sys/sa.h>
+#include <sys/zfs_acl.h>
+#include <sys/zfs_sa.h>
+
+/*
+ * ZPL attribute registration table.
+ * Order of attributes doesn't matter
+ * a unique value will be assigned for each
+ * attribute that is file system specific
+ *
+ * This is just the set of ZPL attributes that this
+ * version of ZFS deals with natively.  The file system
+ * could have other attributes stored in files, but they will be
+ * ignored.  The SA framework will preserve them, just that
+ * this version of ZFS won't change or delete them.
+ */
+
+sa_attr_reg_t zfs_attr_table[ZPL_END+1] = {
+	{"ZPL_ATIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 0},
+	{"ZPL_MTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 1},
+	{"ZPL_CTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 2},
+	{"ZPL_CRTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 3},
+	{"ZPL_GEN", sizeof (uint64_t), SA_UINT64_ARRAY, 4},
+	{"ZPL_MODE", sizeof (uint64_t), SA_UINT64_ARRAY, 5},
+	{"ZPL_SIZE", sizeof (uint64_t), SA_UINT64_ARRAY, 6},
+	{"ZPL_PARENT", sizeof (uint64_t), SA_UINT64_ARRAY, 7},
+	{"ZPL_LINKS", sizeof (uint64_t), SA_UINT64_ARRAY, 8},
+	{"ZPL_XATTR", sizeof (uint64_t), SA_UINT64_ARRAY, 9},
+	{"ZPL_RDEV", sizeof (uint64_t), SA_UINT64_ARRAY, 10},
+	{"ZPL_FLAGS", sizeof (uint64_t), SA_UINT64_ARRAY, 11},
+	{"ZPL_UID", sizeof (uint64_t), SA_UINT64_ARRAY, 12},
+	{"ZPL_GID", sizeof (uint64_t), SA_UINT64_ARRAY, 13},
+	{"ZPL_PAD", sizeof (uint64_t) * 4, SA_UINT64_ARRAY, 14},
+	{"ZPL_ZNODE_ACL", 88, SA_UINT8_ARRAY, 15},
+	{"ZPL_DACL_COUNT", sizeof (uint64_t), SA_UINT64_ARRAY, 0},
+	{"ZPL_SYMLINK", 0, SA_UINT8_ARRAY, 0},
+	{"ZPL_SCANSTAMP", 32, SA_UINT8_ARRAY, 0},
+	{"ZPL_DACL_ACES", 0, SA_ACL, 0},
+	{NULL, 0, 0, 0}
+};
+
+#ifdef _KERNEL
+
+int
+zfs_sa_readlink(znode_t *zp, uio_t *uio)
+{
+	dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
+	size_t bufsz;
+	int error;
+
+	bufsz = zp->z_size;
+	if (bufsz + ZFS_OLD_ZNODE_PHYS_SIZE <= db->db_size) {
+		error = uiomove((caddr_t)db->db_data +
+		    ZFS_OLD_ZNODE_PHYS_SIZE,
+		    MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio);
+	} else {
+		dmu_buf_t *dbp;
+		if ((error = dmu_buf_hold(zp->z_zfsvfs->z_os, zp->z_id,
+		    0, FTAG, &dbp, DMU_READ_NO_PREFETCH)) == 0) {
+			error = uiomove(dbp->db_data,
+			    MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio);
+			dmu_buf_rele(dbp, FTAG);
+		}
+	}
+	return (error);
+}
+
+void
+zfs_sa_symlink(znode_t *zp, char *link, int len, dmu_tx_t *tx)
+{
+	dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
+
+	if (ZFS_OLD_ZNODE_PHYS_SIZE + len <= dmu_bonus_max()) {
+		VERIFY(dmu_set_bonus(db,
+		    len + ZFS_OLD_ZNODE_PHYS_SIZE, tx) == 0);
+		if (len) {
+			bcopy(link, (caddr_t)db->db_data +
+			    ZFS_OLD_ZNODE_PHYS_SIZE, len);
+		}
+	} else {
+		dmu_buf_t *dbp;
+
+		zfs_grow_blocksize(zp, len, tx);
+		VERIFY(0 == dmu_buf_hold(zp->z_zfsvfs->z_os,
+		    zp->z_id, 0, FTAG, &dbp, DMU_READ_NO_PREFETCH));
+
+		dmu_buf_will_dirty(dbp, tx);
+
+		ASSERT3U(len, <=, dbp->db_size);
+		bcopy(link, dbp->db_data, len);
+		dmu_buf_rele(dbp, FTAG);
+	}
+}
+
+void
+zfs_sa_get_scanstamp(znode_t *zp, xvattr_t *xvap)
+{
+	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+	xoptattr_t *xoap;
+
+	ASSERT(MUTEX_HELD(&zp->z_lock));
+	VERIFY((xoap = xva_getxoptattr(xvap)) != NULL);
+	if (zp->z_is_sa) {
+		if (sa_lookup(zp->z_sa_hdl, SA_ZPL_SCANSTAMP(zfsvfs),
+		    &xoap->xoa_av_scanstamp,
+		    sizeof (xoap->xoa_av_scanstamp)) != 0)
+			return;
+	} else {
+		dmu_object_info_t doi;
+		dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
+		int len;
+
+		if (!(zp->z_pflags & ZFS_BONUS_SCANSTAMP))
+			return;
+
+		sa_object_info(zp->z_sa_hdl, &doi);
+		len = sizeof (xoap->xoa_av_scanstamp) +
+		    ZFS_OLD_ZNODE_PHYS_SIZE;
+
+		if (len <= doi.doi_bonus_size) {
+			(void) memcpy(xoap->xoa_av_scanstamp,
+			    (caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
+			    sizeof (xoap->xoa_av_scanstamp));
+		}
+	}
+	XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
+}
+
+void
+zfs_sa_set_scanstamp(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
+{
+	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+	xoptattr_t *xoap;
+
+	ASSERT(MUTEX_HELD(&zp->z_lock));
+	VERIFY((xoap = xva_getxoptattr(xvap)) != NULL);
+	if (zp->z_is_sa)
+		VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SCANSTAMP(zfsvfs),
+		    &xoap->xoa_av_scanstamp,
+		    sizeof (xoap->xoa_av_scanstamp), tx));
+	else {
+		dmu_object_info_t doi;
+		dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
+		int len;
+
+		sa_object_info(zp->z_sa_hdl, &doi);
+		len = sizeof (xoap->xoa_av_scanstamp) +
+		    ZFS_OLD_ZNODE_PHYS_SIZE;
+		if (len > doi.doi_bonus_size)
+			VERIFY(dmu_set_bonus(db, len, tx) == 0);
+		(void) memcpy((caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
+		    xoap->xoa_av_scanstamp, sizeof (xoap->xoa_av_scanstamp));
+
+		zp->z_pflags |= ZFS_BONUS_SCANSTAMP;
+		VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
+		    &zp->z_pflags, sizeof (uint64_t), tx));
+	}
+}
+
+/*
+ * I'm not convinced we should do any of this upgrade.
+ * since the SA code can read both old/new znode formats
+ * with probably little to know performance difference.
+ *
+ * All new files will be created with the new format.
+ */
+
+void
+zfs_sa_upgrade(sa_handle_t *hdl, dmu_tx_t *tx)
+{
+	dmu_buf_t *db = sa_get_db(hdl);
+	znode_t *zp = sa_get_userdata(hdl);
+	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+	sa_bulk_attr_t bulk[20];
+	int count = 0;
+	sa_bulk_attr_t sa_attrs[20] = { 0 };
+	zfs_acl_locator_cb_t locate = { 0 };
+	uint64_t uid, gid, mode, rdev, xattr, parent;
+	uint64_t crtime[2], mtime[2], ctime[2];
+	zfs_acl_phys_t znode_acl;
+	char scanstamp[AV_SCANSTAMP_SZ];
+	boolean_t drop_lock = B_FALSE;
+
+	/*
+	 * No upgrade if ACL isn't cached
+	 * since we won't know which locks are held
+	 * and ready the ACL would require special "locked"
+	 * interfaces that would be messy
+	 */
+	if (zp->z_acl_cached == NULL || ZTOV(zp)->v_type == VLNK)
+		return;
+
+	/*
+	 * If the z_lock is held and we aren't the owner
+	 * the just return since we don't want to deadlock
+	 * trying to update the status of z_is_sa.  This
+	 * file can then be upgraded at a later time.
+	 *
+	 * Otherwise, we know we are doing the
+	 * sa_update() that caused us to enter this function.
+	 */
+	if (mutex_owner(&zp->z_lock) != curthread) {
+		if (mutex_tryenter(&zp->z_lock) == 0)
+			return;
+		else
+			drop_lock = B_TRUE;
+	}
+
+	/* First do a bulk query of the attributes that aren't cached */
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &crtime, 16);
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8);
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_XATTR(zfsvfs), NULL, &xattr, 8);
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_RDEV(zfsvfs), NULL, &rdev, 8);
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, &uid, 8);
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, &gid, 8);
+	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
+	    &znode_acl, 88);
+
+	if (sa_bulk_lookup_locked(hdl, bulk, count) != 0)
+		goto done;
+
+
+	/*
+	 * While the order here doesn't matter its best to try and organize
+	 * it is such a way to pick up an already existing layout number
+	 */
+	count = 0;
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_SIZE(zfsvfs), NULL,
+	    &zp->z_size, 8);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_GEN(zfsvfs),
+	    NULL, &zp->z_gen, 8);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_UID(zfsvfs), NULL, &uid, 8);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_GID(zfsvfs), NULL, &gid, 8);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_PARENT(zfsvfs),
+	    NULL, &parent, 8);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_FLAGS(zfsvfs), NULL,
+	    &zp->z_pflags, 8);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_ATIME(zfsvfs), NULL,
+	    zp->z_atime, 16);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_MTIME(zfsvfs), NULL,
+	    &mtime, 16);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_CTIME(zfsvfs), NULL,
+	    &ctime, 16);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_CRTIME(zfsvfs), NULL,
+	    &crtime, 16);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_LINKS(zfsvfs), NULL,
+	    &zp->z_links, 8);
+	if (zp->z_vnode->v_type == VBLK || zp->z_vnode->v_type == VCHR)
+		SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_RDEV(zfsvfs), NULL,
+		    &rdev, 8);
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
+	    &zp->z_acl_cached->z_acl_count, 8);
+
+	if (zp->z_acl_cached->z_version < ZFS_ACL_VERSION_FUID)
+		zfs_acl_xform(zp, zp->z_acl_cached, CRED());
+
+	locate.cb_aclp = zp->z_acl_cached;
+	SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_DACL_ACES(zfsvfs),
+	    zfs_acl_data_locator, &locate, zp->z_acl_cached->z_acl_bytes);
+
+	if (xattr)
+		SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_XATTR(zfsvfs),
+		    NULL, &xattr, 8);
+
+	/* if scanstamp then add scanstamp */
+
+	if (zp->z_pflags & ZFS_BONUS_SCANSTAMP) {
+		bcopy((caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
+		    scanstamp, AV_SCANSTAMP_SZ);
+		SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_SCANSTAMP(zfsvfs),
+		    NULL, scanstamp, AV_SCANSTAMP_SZ);
+		zp->z_pflags &= ~ZFS_BONUS_SCANSTAMP;
+	}
+
+	VERIFY(dmu_set_bonustype(db, DMU_OT_SA, tx) == 0);
+	VERIFY(sa_replace_all_by_template_locked(hdl, sa_attrs,
+	    count, tx) == 0);
+	if (znode_acl.z_acl_extern_obj)
+		VERIFY(0 == dmu_object_free(zfsvfs->z_os,
+		    znode_acl.z_acl_extern_obj, tx));
+
+	zp->z_is_sa = B_TRUE;
+done:
+	if (drop_lock)
+		mutex_exit(&zp->z_lock);
+}
+
+void
+zfs_sa_upgrade_txholds(dmu_tx_t *tx, znode_t *zp)
+{
+	if (!zp->z_zfsvfs->z_use_sa || zp->z_is_sa)
+		return;
+
+
+	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
+
+	if (zfs_external_acl(zp)) {
+		dmu_tx_hold_free(tx, zfs_external_acl(zp), 0,
+		    DMU_OBJECT_END);
+	}
+}
+
+#endif