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SubjectRe: [Linux-NTFS-Dev] 2.6.23 regression: second access of empty ntfs file leads to D state hang
Date
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@gmx.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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