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authorAnton Altaparmakov <aia21@cam.ac.uk>2007-11-03 07:38:59 +0000
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-03 12:27:21 -0700
commitebab89909e0dc716282d5e7f6e73a3155fe66d4a (patch)
tree8cee9ff6f9e0a08c6f08853e38e563514e92a99e /fs/ntfs/compress.c
parent74521c28e550c4ec265cda14114bd9b908e9de34 (diff)
downloadlinux-ebab89909e0dc716282d5e7f6e73a3155fe66d4a.tar.bz2
NTFS: Fix read regression.
The regression was caused by: commit[a32ea1e1f925399e0d81ca3f7394a44a6dafa12c] Fix read/truncate race This causes ntfs_readpage() to be called for a zero i_size inode, which failed when the file was compressed and non-resident. Thanks a lot to Mike Galbraith for reporting the issue and tracking down the commit that caused the regression. Looking into it I found three bugs which the patch fixes. Signed-off-by: Anton Altaparmakov <aia21@cantab.net> Tested-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ntfs/compress.c')
-rw-r--r--fs/ntfs/compress.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/ntfs/compress.c b/fs/ntfs/compress.c
index d98daf59e0b6..d1619d05eb23 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++) {