[PATCH V4 05/21] metadump: Add initialization and release functions

[Chandan Babu R <chandan.babu@xxxxxxxxxx>]

Move metadump initialization and release functionality into corresponding
functions. There are no functional changes made in this commit.

Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Signed-off-by: Chandan Babu R <chandan.babu@xxxxxxxxxx>
---
 db/metadump.c | 88 ++++++++++++++++++++++++++++++---------------------
 1 file changed, 52 insertions(+), 36 deletions(-)

diff --git a/db/metadump.c b/db/metadump.c
index da91000c..8d921500 100644
--- a/db/metadump.c
+++ b/db/metadump.c
@@ -2665,6 +2665,54 @@ done:
 	return !write_buf(iocur_top);
 }
 
+static int
+init_metadump(void)
+{
+	metadump.metablock = (xfs_metablock_t *)calloc(BBSIZE + 1, BBSIZE);
+	if (metadump.metablock == NULL) {
+		print_warning("memory allocation failure");
+		return -1;
+	}
+	metadump.metablock->mb_blocklog = BBSHIFT;
+	metadump.metablock->mb_magic = cpu_to_be32(XFS_MD_MAGIC);
+
+	/* Set flags about state of metadump */
+	metadump.metablock->mb_info = XFS_METADUMP_INFO_FLAGS;
+	if (metadump.obfuscate)
+		metadump.metablock->mb_info |= XFS_METADUMP_OBFUSCATED;
+	if (!metadump.zero_stale_data)
+		metadump.metablock->mb_info |= XFS_METADUMP_FULLBLOCKS;
+	if (metadump.dirty_log)
+		metadump.metablock->mb_info |= XFS_METADUMP_DIRTYLOG;
+
+	metadump.block_index = (__be64 *)((char *)metadump.metablock +
+				sizeof(xfs_metablock_t));
+	metadump.block_buffer = (char *)(metadump.metablock) + BBSIZE;
+	metadump.num_indices = (BBSIZE - sizeof(xfs_metablock_t)) / sizeof(__be64);
+
+	/*
+	 * A metadump block can hold at most num_indices of BBSIZE sectors;
+	 * do not try to dump a filesystem with a sector size which does not
+	 * fit within num_indices (i.e. within a single metablock).
+	 */
+	if (mp->m_sb.sb_sectsize > metadump.num_indices * BBSIZE) {
+		print_warning("Cannot dump filesystem with sector size %u",
+			      mp->m_sb.sb_sectsize);
+		free(metadump.metablock);
+		return -1;
+	}
+
+	metadump.cur_index = 0;
+
+	return 0;
+}
+
+static void
+release_metadump(void)
+{
+	free(metadump.metablock);
+}
+
 static int
 metadump_f(
 	int 		argc,
@@ -2757,48 +2805,16 @@ metadump_f(
 		pop_cur();
 	}
 
-	metadump.metablock = (xfs_metablock_t *)calloc(BBSIZE + 1, BBSIZE);
-	if (metadump.metablock == NULL) {
-		print_warning("memory allocation failure");
-		return -1;
-	}
-	metadump.metablock->mb_blocklog = BBSHIFT;
-	metadump.metablock->mb_magic = cpu_to_be32(XFS_MD_MAGIC);
-
-	/* Set flags about state of metadump */
-	metadump.metablock->mb_info = XFS_METADUMP_INFO_FLAGS;
-	if (metadump.obfuscate)
-		metadump.metablock->mb_info |= XFS_METADUMP_OBFUSCATED;
-	if (!metadump.zero_stale_data)
-		metadump.metablock->mb_info |= XFS_METADUMP_FULLBLOCKS;
-	if (metadump.dirty_log)
-		metadump.metablock->mb_info |= XFS_METADUMP_DIRTYLOG;
-
-	metadump.block_index = (__be64 *)((char *)metadump.metablock +
-					sizeof(xfs_metablock_t));
-	metadump.block_buffer = (char *)metadump.metablock + BBSIZE;
-	metadump.num_indices = (BBSIZE - sizeof(xfs_metablock_t)) /
-		sizeof(__be64);
-
-	/*
-	 * A metadump block can hold at most num_indices of BBSIZE sectors;
-	 * do not try to dump a filesystem with a sector size which does not
-	 * fit within num_indices (i.e. within a single metablock).
-	 */
-	if (mp->m_sb.sb_sectsize > metadump.num_indices * BBSIZE) {
-		print_warning("Cannot dump filesystem with sector size %u",
-			      mp->m_sb.sb_sectsize);
-		free(metadump.metablock);
+	ret = init_metadump();
+	if (ret)
 		return 0;
-	}
 
 	start_iocur_sp = iocur_sp;
 
 	if (strcmp(argv[optind], "-") == 0) {
 		if (isatty(fileno(stdout))) {
 			print_warning("cannot write to a terminal");
-			free(metadump.metablock);
-			return 0;
+			goto out;
 		}
 		/*
 		 * Redirect stdout to stderr for the duration of the
@@ -2875,7 +2891,7 @@ metadump_f(
 	while (iocur_sp > start_iocur_sp)
 		pop_cur();
 out:
-	free(metadump.metablock);
+	release_metadump();
 
 	return 0;
 }
-- 
2.39.1