linux-kernel - Re: [PATCH 13/30] IGET: Stop EXT4 from using iget() and read

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Message-ID: <20071002122652.GE25647@atrey.karlin.mff.cuni.cz>
Date:	Tue, 2 Oct 2007 14:26:52 +0200
From:	Jan Kara <jack@...e.cz>
To:	David Howells <dhowells@...hat.com>
Cc:	hch@...radead.org, viro@....linux.org.uk, torvalds@...l.org,
	akpm@...l.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 13/30] IGET: Stop EXT4 from using iget() and read_inode()

> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index 427f830..8bb63f2 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -682,9 +682,14 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
>  	 * is a valid orphan (no e2fsck run on fs).  Orphans also include
>  	 * inodes that were being truncated, so we can't check i_nlink==0.
>  	 */
> -	if (!ext4_test_bit(bit, bitmap_bh->b_data) ||
> -			!(inode = iget(sb, ino)) || is_bad_inode(inode) ||
> -			NEXT_ORPHAN(inode) > max_ino) {
> +	if (ext4_test_bit(bit, bitmap_bh->b_data))
> +		goto out;
> +
> +	inode = ext4_iget(sb, ino);
> +	if (IS_ERR(inode))
> +		goto out;
> +
> +	if (NEXT_ORPHAN(inode) > max_ino) {
>  		ext4_warning(sb, __FUNCTION__,
>  			     "bad orphan inode %lu!  e2fsck was run?", ino);
>  		printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n",
  Same comments as for ext3 - I think you reversed ext4_test_bit() test
and also the warning won't be issued in some cases which is wrong.

> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 5fdb862..af98d07 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -1044,17 +1044,11 @@ static struct dentry *ext4_lookup(struct inode * dir, struct dentry *dentry, str
>  		if (!ext4_valid_inum(dir->i_sb, ino)) {
>  			ext4_error(dir->i_sb, "ext4_lookup",
>  				   "bad inode number: %lu", ino);
> -			inode = NULL;
> -		} else
> -			inode = iget(dir->i_sb, ino);
> -
> -		if (!inode)
>  			return ERR_PTR(-EACCES);
  -EIO more appropriate here?

										Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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