linux-ext4 - [PATCH] ext4:Fix credits computing for indirect mapped files.

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Date:	Fri, 25 Mar 2011 21:10:05 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	tytso@....edu
Cc:	linux-ext4@...r.kernel.org, Yongqiang Yang <xiaoqiangnk@...il.com>
Subject: [PATCH] ext4:Fix credits computing for indirect mapped files.

Either the first block or the last one could be not aligned with
block boundary, 1 block is needed to fix it.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
---
 fs/ext4/inode.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 67e7a3c..7193f23 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5380,11 +5380,11 @@ static int ext4_indirect_trans_blocks(struct inode *inode, int nrblocks,
 	if (chunk) {
 		/*
 		 * With N contiguous data blocks, it need at most
-		 * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) indirect blocks
+		 * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) + 1 indirect blocks
 		 * 2 dindirect blocks
 		 * 1 tindirect block
 		 */
-		indirects = nrblocks / EXT4_ADDR_PER_BLOCK(inode->i_sb);
+		indirects = nrblocks / EXT4_ADDR_PER_BLOCK(inode->i_sb) + 1;
 		return indirects + 3;
 	}
 	/*
-- 
1.7.4

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