linux-ext4 - [PATCH -V5] Fix sub-block zeroing for buffered writes intounwritten extents

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Date:	Tue, 12 May 2009 20:46:46 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Theodore Tso <tytso@....edu>
Cc:	cmm@...ibm.com, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: [PATCH -V5] Fix sub-block zeroing for buffered writes
	intounwritten extents


ext3: Fix sub-block zeroing for writes into preallocated extents

From: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

We need to mark the buffer_head mapping preallocated space as new
during write_begin. Otherwise we don't zero out the page cache content
properly for a partial write. This will cause file corruption with
preallocation.

Now that we mark the buffer_head new we also need to have a valid
buffer_head blocknr so that unmap_underlying_metadata unmap the
right block.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
 fs/ext4/extents.c |    2 ++
 fs/ext4/inode.c   |    8 ++++++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index e403321..c3768cd 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2875,6 +2875,8 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
 				if (allocated > max_blocks)
 					allocated = max_blocks;
 				set_buffer_unwritten(bh_result);
+				bh_result->b_bdev    = inode->i_sb->s_bdev;
+				bh_result->b_blocknr = newblock;
 				goto out2;
 			}
 
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e91f978..498cf8b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2323,6 +2323,14 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
 		set_buffer_delay(bh_result);
 	} else if (ret > 0) {
 		bh_result->b_size = (ret << inode->i_blkbits);
+		/*
+		 * With sub-block writes into unwritten extents
+		 * we also need to mark the buffer as new so that
+		 * the unwritten parts of the buffer gets correctly zeroed.
+		 */
+		if (buffer_unwritten(bh_result)) {
+			set_buffer_new(bh_result);
+		}
 		ret = 0;
 	}
 
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