1 files changed, 348 insertions, 0 deletions

diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/zfs_log.c b/sys/contrib/opensolaris/uts/common/fs/zfs/zfs_log.c
new file mode 100644
index 000000000000..06cb95a2d7ee
--- /dev/null
+++ b/sys/contrib/opensolaris/uts/common/fs/zfs/zfs_log.c
@@ -0,0 +1,348 @@
+/*
+ * 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 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#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/byteorder.h>
+#include <sys/stat.h>
+#include <sys/acl.h>
+#include <sys/dmu.h>
+#include <sys/spa.h>
+
+/*
+ * All the functions in this file are used to construct the log entries
+ * to record transactions. They allocate * a 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.
+ */
+
+/*
+ * zfs_log_create() is used to handle TX_CREATE, TX_MKDIR and TX_MKXATTR
+ * transactions.
+ */
+void
+zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, int txtype,
+	znode_t *dzp, znode_t *zp, char *name)
+{
+	itx_t *itx;
+	uint64_t seq;
+	lr_create_t *lr;
+	size_t namesize = strlen(name) + 1;
+
+	if (zilog == NULL)
+		return;
+
+	itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
+	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];
+	lr->lr_rdev = zp->z_phys->zp_rdev;
+	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_remove() handles both TX_REMOVE and TX_RMDIR transactions.
+ */
+void
+zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, int 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, int 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, int 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, int 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;
+
+void
+zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype,
+	znode_t *zp, offset_t off, ssize_t len, int ioflag)
+{
+	itx_t *itx;
+	uint64_t seq;
+	lr_write_t *lr;
+	itx_wr_state_t write_state;
+	int err;
+
+	if (zilog == NULL || zp->z_unlinked)
+		return;
+
+	/*
+	 * Writes are handled in three different ways:
+	 *
+	 * WR_INDIRECT:
+	 *    If the write is greater than zfs_immediate_write_sz then
+	 *    later *if* we need to log the write then dmu_sync() is used
+	 *    to immediately write the block and it's block pointer is put
+	 *    in the log record.
+	 * WR_COPIED:
+	 *    If we know we'll immediately be committing the
+	 *    transaction (FDSYNC (O_DSYNC)), 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.
+	 */
+	if (len > zfs_immediate_write_sz)
+		write_state = WR_INDIRECT;
+	else if (ioflag & IO_SYNC)
+		write_state = WR_COPIED;
+	else
+		write_state = WR_NEED_COPY;
+
+	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) {
+		err = dmu_read(zp->z_zfsvfs->z_os, zp->z_id, off, len, lr + 1);
+		if (err) {
+			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;
+	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;
+
+	itx->itx_sync = (zp->z_sync_cnt != 0);
+	seq = zil_itx_assign(zilog, itx, tx);
+	zp->z_last_itx = seq;
+}
+
+/*
+ * 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)
+{
+	itx_t *itx;
+	uint64_t seq;
+	lr_setattr_t *lr;
+
+	if (zilog == NULL || zp->z_unlinked)
+		return;
+
+	itx = zil_itx_create(txtype, sizeof (*lr));
+	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;
+	lr->lr_uid = (uint64_t)vap->va_uid;
+	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);
+
+	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, int txtype,
+	znode_t *zp, int aclcnt, ace_t *z_ace)
+{
+	itx_t *itx;
+	uint64_t seq;
+	lr_acl_t *lr;
+
+	if (zilog == NULL || zp->z_unlinked)
+		return;
+
+	itx = zil_itx_create(txtype, sizeof (*lr) + aclcnt * sizeof (ace_t));
+	lr = (lr_acl_t *)&itx->itx_lr;
+	lr->lr_foid = zp->z_id;
+	lr->lr_aclcnt = (uint64_t)aclcnt;
+	bcopy(z_ace, (ace_t *)(lr + 1), aclcnt * sizeof (ace_t));
+
+	itx->itx_sync = (zp->z_sync_cnt != 0);
+	seq = zil_itx_assign(zilog, itx, tx);
+	zp->z_last_itx = seq;
+}