linux-kernel - Re: [PATCH 36/49] ext4: Add EXT4_IOC

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Date:	Fri, 25 Jan 2008 23:15:00 -0500
From:	Theodore Tso <tytso@....edu>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 36/49] ext4: Add EXT4_IOC_MIGRATE ioctl

On Thu, Jan 24, 2008 at 11:25:32AM +0530, Aneesh Kumar K.V wrote:
> +static int free_ext_idx(handle_t *handle, struct inode *inode,
> +					struct ext4_extent_idx *ix)
> +{
> +	int i, retval = 0;
> +	ext4_fsblk_t block;
> +	struct buffer_head *bh;
> +	struct ext4_extent_header *eh;
> +
> +	block = idx_pblock(ix);
> +	bh = sb_bread(inode->i_sb, block);
> +	if (!bh)
> +		return -EIO;
> +
> +	eh = (struct ext4_extent_header *)bh->b_data;
> +	if (eh->eh_depth == 0) {
> +		brelse(bh);
> +		ext4_free_blocks(handle, inode, block, 1);
> +	} else {
> +		ix = EXT_FIRST_INDEX(eh);
> +		for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
> +			retval = free_ext_idx(handle, inode, ix);
> +			if (retval)
> +				return retval;
> +		}
> +	}
> +	return retval;
> +}

Aneesh, looks like if eh->eh_depth is != 0, bh gets leaked.  This is
how I plan to fix it up:

+static int free_ext_idx(handle_t *handle, struct inode *inode,
+					struct ext4_extent_idx *ix)
+{
+	int i, retval = 0;
+	ext4_fsblk_t block;
+	struct buffer_head *bh;
+	struct ext4_extent_header *eh;
+
+	block = idx_pblock(ix);
+	bh = sb_bread(inode->i_sb, block);
+	if (!bh)
+		return -EIO;
+
+	eh = (struct ext4_extent_header *)bh->b_data;
+	if (eh->eh_depth == 0)
+		ext4_free_blocks(handle, inode, block, 1);
+	else {
+		ix = EXT_FIRST_INDEX(eh);
+		for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
+			retval = free_ext_idx(handle, inode, ix);
+			if (retval)
+				break;
+		}
+	}
+	put_bh(bh);
+	return retval;
+}

						- Ted
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