linux-kernel - Re: Subject: [PATCH 01/16] Squashfs: inode operations

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Date:	Wed, 22 Oct 2008 19:13:21 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Phillip Lougher <phillip@...gher.demon.co.uk>
cc:	akpm@...ux-foundation.org, linux-embedded@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	tim.bird@...sony.com
Subject: Re: Subject: [PATCH 01/16] Squashfs: inode operations

On Fri, 17 Oct 2008, Phillip Lougher wrote:
> --- /dev/null
> +++ b/fs/squashfs/inode.c

> +	case SQUASHFS_BLKDEV_TYPE:
> +	case SQUASHFS_CHRDEV_TYPE: {
> +		struct squashfs_dev_inode *inodep = &id.dev;
> +		unsigned int rdev;
> +
> +		if (!squashfs_read_metadata(s, inodep, block, offset,
> +				sizeof(*inodep), &next_block, &next_offset))
> +			goto failed_read;
> +
> +		i->i_nlink = le32_to_cpu(inodep->nlink);
> +		i->i_mode |= (type == SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : S_IFBLK;
> +		rdev = le32_to_cpu(inodep->rdev);
> +		init_special_inode(i, le16_to_cpu(i->i_mode),
                                      ^^^^^^^^^^^
> +					new_decode_dev(rdev));
> +
> +		TRACE("Device inode %x:%x, rdev %x\n",
> +				SQUASHFS_INODE_BLK(inode), offset, rdev);
> +		break;
> +	}
> +	case SQUASHFS_FIFO_TYPE:
> +	case SQUASHFS_SOCKET_TYPE: {
> +		struct squashfs_ipc_inode *inodep = &id.ipc;
> +
> +		if (!squashfs_read_metadata(s, inodep, block, offset,
> +				sizeof(*inodep), &next_block, &next_offset))
> +			goto failed_read;
> +
> +		i->i_nlink = le32_to_cpu(inodep->nlink);
> +		i->i_mode |= (type == SQUASHFS_FIFO_TYPE) ? S_IFIFO : S_IFSOCK;
> +		init_special_inode(i, le16_to_cpu(i->i_mode), 0);
                                      ^^^^^^^^^^^
> +		break;

Sparse with endian checking (make C=2 CHECKFLAGS="-D__CHECK_ENDIAN__") complains
about these:

| fs/squashfs/inode.c:306:25: warning: cast to restricted __le16
| fs/squashfs/inode.c:324:25: warning: cast to restricted __le16

and it seems to be right, as inode.i_mode is not __le16. I think the le16_to_cpu()
should be removed.

BTW, there are also a few sparse warnings about different signednesses, so you
probably want to run sparse yourself, too.

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
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E-mail:   Geert.Uytterhoeven@...ycom.com
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