linux-ext4 - [PATCH 3/4] ext4: use ext4_get_group

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Message-ID: <20080217061352.GJ3390@APFDCB5C>
Date:	Sun, 17 Feb 2008 15:13:53 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Tweedie <sct@...hat.com>, adilger@...sterfs.com,
	Mingming Cao <cmm@...ibm.com>, Theodore Tso <tytso@....EDU>
Subject: [PATCH 3/4] ext4: use ext4_get_group_desc()

Use ext4_get_group_desc()

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Stephen Tweedie <sct@...hat.com>
Cc: adilger@...sterfs.com
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mingming Cao <cmm@...ibm.com>
Cc: Theodore Tso <tytso@....EDU>
---
 fs/ext4/inode.c |   20 +++-----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

Index: 2.6-rc/fs/ext4/inode.c
===================================================================
--- 2.6-rc.orig/fs/ext4/inode.c
+++ 2.6-rc/fs/ext4/inode.c
@@ -2455,12 +2455,10 @@ out_stop:
 static ext4_fsblk_t ext4_get_inode_block(struct super_block *sb,
 		unsigned long ino, struct ext4_iloc *iloc)
 {
-	unsigned long desc, group_desc;
 	ext4_group_t block_group;
 	unsigned long offset;
 	ext4_fsblk_t block;
-	struct buffer_head *bh;
-	struct ext4_group_desc * gdp;
+	struct ext4_group_desc *gdp;
 
 	if (!ext4_valid_inum(sb, ino)) {
 		/*
@@ -2472,22 +2470,10 @@ static ext4_fsblk_t ext4_get_inode_block
 	}
 
 	block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
-	if (block_group >= EXT4_SB(sb)->s_groups_count) {
-		ext4_error(sb,"ext4_get_inode_block","group >= groups count");
+	gdp = ext4_get_group_desc(sb, block_group, NULL);
+	if (!gdp)
 		return 0;
-	}
-	smp_rmb();
-	group_desc = block_group >> EXT4_DESC_PER_BLOCK_BITS(sb);
-	desc = block_group & (EXT4_DESC_PER_BLOCK(sb) - 1);
-	bh = EXT4_SB(sb)->s_group_desc[group_desc];
-	if (!bh) {
-		ext4_error (sb, "ext4_get_inode_block",
-			    "Descriptor not loaded");
-		return 0;
-	}
 
-	gdp = (struct ext4_group_desc *)((__u8 *)bh->b_data +
-		desc * EXT4_DESC_SIZE(sb));
 	/*
 	 * Figure out the offset within the block group inode table
 	 */
-
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