linux-ext4 - [PATCH 1/3] ext4: Properly initialize the buffer

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Date:	Thu,  7 May 2009 16:09:28 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	cmm@...ibm.com, tytso@....edu, sandeen@...hat.com
Cc:	linux-ext4@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH 1/3] ext4: Properly initialize the buffer_head state

These buffer_heads are allocated on stack and are
used only to make get_blocks calls. So we can set the
b_state to 0

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
 fs/ext4/extents.c |    1 +
 fs/ext4/inode.c   |    2 +-
 fs/mpage.c        |    2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index e963870..10b3028 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3141,6 +3141,7 @@ long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len)
 			ret = PTR_ERR(handle);
 			break;
 		}
+		map_bh.b_state = 0;
 		ret = ext4_get_blocks_wrap(handle, inode, block,
 					  max_blocks, &map_bh,
 					  EXT4_CREATE_UNINITIALIZED_EXT, 0, 0);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 43884e3..c3cd00f 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2104,7 +2104,7 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd)
 	if ((mpd->b_state  & (1 << BH_Mapped)) &&
 	    !(mpd->b_state & (1 << BH_Delay)))
 		return 0;
-	new.b_state = mpd->b_state;
+	new.b_state = 0;
 	new.b_blocknr = 0;
 	new.b_size = mpd->b_size;
 	next = mpd->b_blocknr;
diff --git a/fs/mpage.c b/fs/mpage.c
index 680ba60..cd98409 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -412,7 +412,7 @@ int mpage_readpage(struct page *page, get_block_t get_block)
 	struct buffer_head map_bh;
 	unsigned long first_logical_block = 0;
 
-	clear_buffer_mapped(&map_bh);
+	map_bh.b_state = 0;
 	bio = do_mpage_readpage(bio, page, 1, &last_block_in_bio,
 			&map_bh, &first_logical_block, get_block);
 	if (bio)
-- 
1.6.3.rc4

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