summaryrefslogtreecommitdiffstats
path: root/include/grub/zfs/zil.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/grub/zfs/zil.h')
-rw-r--r--include/grub/zfs/zil.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/include/grub/zfs/zil.h b/include/grub/zfs/zil.h
new file mode 100644
index 0000000..45d16f4
--- /dev/null
+++ b/include/grub/zfs/zil.h
@@ -0,0 +1,56 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
+ *
+ * GRUB is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_ZIL_H
+#define _SYS_ZIL_H
+
+/*
+ * Intent log format:
+ *
+ * Each objset has its own intent log. The log header (zil_header_t)
+ * for objset N's intent log is kept in the Nth object of the SPA's
+ * intent_log objset. The log header points to a chain of log blocks,
+ * each of which contains log records (i.e., transactions) followed by
+ * a log block trailer (zil_trailer_t). The format of a log record
+ * depends on the record (or transaction) type, but all records begin
+ * with a common structure that defines the type, length, and txg.
+ */
+
+/*
+ * Intent log header - this on disk structure holds fields to manage
+ * the log. All fields are 64 bit to easily handle cross architectures.
+ */
+typedef struct zil_header {
+ grub_uint64_t zh_claim_txg; /* txg in which log blocks were claimed */
+ grub_uint64_t zh_replay_seq; /* highest replayed sequence number */
+ blkptr_t zh_log; /* log chain */
+ grub_uint64_t zh_claim_seq; /* highest claimed sequence number */
+ grub_uint64_t zh_flags; /* header flags */
+ grub_uint64_t zh_pad[4];
+} zil_header_t;
+
+/*
+ * zh_flags bit settings
+ */
+#define ZIL_REPLAY_NEEDED 0x1 /* replay needed - internal only */
+
+#endif /* _SYS_ZIL_H */