metadump: Define metadump ops for v2 format

This commit adds functionality to dump metadata from an XFS filesystem in
newly introduced v2 format.

Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

1 files changed, 71 insertions, 3 deletions

diff --git a/db/metadump.c b/db/metadump.c
index bc203893c6..81023cf178 100644
--- a/db/metadump.c
+++ b/db/metadump.c
@@ -2737,6 +2737,70 @@ static struct metadump_ops metadump1_ops = {
 };
 
 static int
+init_metadump_v2(void)
+{
+	struct xfs_metadump_header	xmh = {0};
+	uint32_t			compat_flags = 0;
+
+	xmh.xmh_magic = cpu_to_be32(XFS_MD_MAGIC_V2);
+	xmh.xmh_version = cpu_to_be32(2);
+
+	if (metadump.obfuscate)
+		compat_flags |= XFS_MD2_COMPAT_OBFUSCATED;
+	if (!metadump.zero_stale_data)
+		compat_flags |= XFS_MD2_COMPAT_FULLBLOCKS;
+	if (metadump.dirty_log)
+		compat_flags |= XFS_MD2_COMPAT_DIRTYLOG;
+
+	xmh.xmh_compat_flags = cpu_to_be32(compat_flags);
+
+	if (fwrite(&xmh, sizeof(xmh), 1, metadump.outf) != 1) {
+		print_warning("error writing to target file");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+write_metadump_v2(
+	enum typnm		type,
+	const char		*data,
+	xfs_daddr_t		off,
+	int			len)
+{
+	struct xfs_meta_extent	xme;
+	uint64_t		addr;
+
+	addr = off;
+	if (type == TYP_LOG &&
+	    mp->m_logdev_targp->bt_bdev != mp->m_ddev_targp->bt_bdev)
+		addr |= XME_ADDR_LOG_DEVICE;
+	else
+		addr |= XME_ADDR_DATA_DEVICE;
+
+	xme.xme_addr = cpu_to_be64(addr);
+	xme.xme_len = cpu_to_be32(len);
+
+	if (fwrite(&xme, sizeof(xme), 1, metadump.outf) != 1) {
+		print_warning("error writing to target file");
+		return -EIO;
+	}
+
+	if (fwrite(data, len << BBSHIFT, 1, metadump.outf) != 1) {
+		print_warning("error writing to target file");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static struct metadump_ops metadump2_ops = {
+	.init	= init_metadump_v2,
+	.write	= write_metadump_v2,
+};
+
+static int
 metadump_f(
 	int 		argc,
 	char 		**argv)
@@ -2872,7 +2936,10 @@ metadump_f(
 		}
 	}
 
-	metadump.mdops = &metadump1_ops;
+	if (metadump.version == 1)
+		metadump.mdops = &metadump1_ops;
+	else
+		metadump.mdops = &metadump2_ops;
 
 	ret = metadump.mdops->init();
 	if (ret)
@@ -2896,7 +2963,7 @@ metadump_f(
 		exitcode = !copy_log();
 
 	/* write the remaining index */
-	if (!exitcode)
+	if (!exitcode && metadump.mdops->finish_dump)
 		exitcode = metadump.mdops->finish_dump() < 0;
 
 	if (metadump.progress_since_warning)
@@ -2916,7 +2983,8 @@ metadump_f(
 	while (iocur_sp > start_iocur_sp)
 		pop_cur();
 
-	metadump.mdops->release();
+	if (metadump.mdops->release)
+		metadump.mdops->release();
 
 out:
 	return 0;