linux-kernel - Re: [Linux-NTFS-Dev] 2.6.23 regression: second access of empty ntfs file leads to D state hang

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Date:	Sat, 3 Nov 2007 07:27:03 +0000
From:	Anton Altaparmakov <aia21@....ac.uk>
To:	Mike Galbraith <efault@....de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	ntfs-dev <linux-ntfs-dev@...ts.sourceforge.net>,
	Neil Brown <neilb@...e.de>
Subject: Re: [Linux-NTFS-Dev] 2.6.23 regression: second access of empty ntfs file leads to D	state hang

Great, thanks!  I will submit it to Linus.

Best regards,

	Anton

On 3 Nov 2007, at 04:56, Mike Galbraith wrote:

> On Fri, 2007-11-02 at 19:22 +0000, Anton Altaparmakov wrote:
>
>> Would you be able to test it in your setup?  Thanks a lot in advance!
>
> Modulo uninitialized vi, works fine.  I moved it up, and all is well.
> Thanks.
>
> Tested-by:  Mike Galbraith <efault@....de>
>
> diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
> index cfdc790..ad87cb0 100644
> --- a/fs/ntfs/aops.c
> +++ b/fs/ntfs/aops.c
> @@ -405,6 +405,15 @@ static int ntfs_readpage(struct file *file,  
> struct page *page)
>
> retry_readpage:
> 	BUG_ON(!PageLocked(page));
> +	vi = page->mapping->host;
> +	i_size = i_size_read(vi);
> +	/* Is the page fully outside i_size? (truncate in progress) */
> +	if (unlikely(page->index >= (i_size + PAGE_CACHE_SIZE - 1) >>
> +			PAGE_CACHE_SHIFT)) {
> +		zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
> +		ntfs_debug("Read outside i_size - truncated?");
> +		goto done;
> +	}
> 	/*
> 	 * This can potentially happen because we clear PageUptodate() during
> 	 * ntfs_writepage() of MstProtected() attributes.
> @@ -413,7 +422,6 @@ retry_readpage:
> 		unlock_page(page);
> 		return 0;
> 	}
> -	vi = page->mapping->host;
> 	ni = NTFS_I(vi);
> 	/*
> 	 * Only $DATA attributes can be encrypted and only unnamed $DATA
> diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c
> index 92dabdc..50d3b0c 100644
> --- a/fs/ntfs/attrib.c
> +++ b/fs/ntfs/attrib.c
> @@ -179,10 +179,7 @@ int ntfs_map_runlist_nolock(ntfs_inode *ni, VCN  
> vcn, ntfs_attr_search_ctx *ctx)
> 	 * ntfs_mapping_pairs_decompress() fails.
> 	 */
> 	end_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn) + 1;
> -	if (!a->data.non_resident.lowest_vcn && end_vcn == 1)
> -		end_vcn = sle64_to_cpu(a->data.non_resident.allocated_size) >>
> -				ni->vol->cluster_size_bits;
> -	if (unlikely(vcn >= end_vcn)) {
> +	if (unlikely(vcn && vcn >= end_vcn)) {
> 		err = -ENOENT;
> 		goto err_out;
> 	}
> diff --git a/fs/ntfs/compress.c b/fs/ntfs/compress.c
> index d98daf5..d1619d0 100644
> --- a/fs/ntfs/compress.c
> +++ b/fs/ntfs/compress.c
> @@ -561,6 +561,16 @@ int ntfs_read_compressed_block(struct page *page)
> 	read_unlock_irqrestore(&ni->size_lock, flags);
> 	max_page = ((i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
> 			offset;
> +	/* Is the page fully outside i_size? (truncate in progress) */
> +	if (xpage >= max_page) {
> +		kfree(bhs);
> +		kfree(pages);
> +		zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
> +		ntfs_debug("Compressed read outside i_size - truncated?");
> +		SetPageUptodate(page);
> +		unlock_page(page);
> +		return 0;
> +	}
> 	if (nr_pages < max_page)
> 		max_page = nr_pages;
> 	for (i = 0; i < max_page; i++, offset++) {

-- 
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer, http://www.linux-ntfs.org/

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