linux-ext4 - [PATCH 1/2] dumpe2fs: dump blocks count used by super and GDT

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Message-Id: <1321405328-5298-1-git-send-email-xiaoqiangnk@gmail.com>
Date:	Wed, 16 Nov 2011 09:02:07 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	tytso@....edu
Cc:	linux-ext4@...r.kernel.org, Yongqiang Yang <xiaoqiangnk@...il.com>
Subject: [PATCH 1/2] dumpe2fs: dump blocks count used by super and GDT

Blocks count used by super and GDT is dumped so that users
can know how many blocks are taken up by super and GDT.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
---
 misc/dumpe2fs.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/misc/dumpe2fs.c b/misc/dumpe2fs.c
index 5b114e9..2f9e87b 100644
--- a/misc/dumpe2fs.c
+++ b/misc/dumpe2fs.c
@@ -489,6 +489,32 @@ static void parse_extended_opts(const char *opts, blk64_t *superblock,
 	free(buf);
 }
 
+void print_super_gdt_blocks_count (ext2_filsys fs) {
+	blk64_t gdt_blks = 0, super_blks = 0;
+	blk64_t	super_blk, old_desc_blk, new_desc_blk;
+	blk64_t old_desc_blocks;
+	unsigned int grp;
+
+	if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
+		old_desc_blocks = fs->super->s_first_meta_bg;
+	else
+		old_desc_blocks = fs->desc_blocks;
+
+	for (grp = 0; grp < fs->group_desc_count; grp++) {
+		ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
+					  &old_desc_blk, &new_desc_blk, 0);
+		if (old_desc_blk)
+			gdt_blks += old_desc_blocks + 
+				    fs->super->s_reserved_gdt_blocks;
+		else if (new_desc_blk)
+			gdt_blks++;
+		super_blks += ((grp == 0) || super_blk);
+	}
+	printf("\nSuper blocks:             %llu\n", super_blks);
+	printf("GDT   blocks:             %llu\n", gdt_blks);
+}
+
+
 int main (int argc, char ** argv)
 {
 	errcode_t	retval;
@@ -588,6 +614,12 @@ int main (int argc, char ** argv)
 		     EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
 		    (fs->super->s_journal_inum != 0))
 			print_inline_journal_information(fs);
+
+		/*
+		 * Print block used by super and group descriptors.
+		 */
+		print_super_gdt_blocks_count(fs);
+
 		list_bad_blocks(fs, 0);
 		if (header_only) {
 			ext2fs_close (fs);
-- 
1.7.5.1

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