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zisofs: fix readpage() outside i_size

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A read request outside i_size will be handled in do_generic_file_read().  So
we just return 0 to avoid getting -EIO as normal reading, let
do_generic_file_read do the rest.

At the same time we need unlock the page to avoid system stuck.

Fixes http://bugzilla.kernel.org/show_bug.cgi?id=10227

Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Acked-by: Jan Kara <jack@suse.cz>
Report-by: Christian Perle <chris@linuxinfotag.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Young 2008-03-19 17:01:01 -07:00 committed by Linus Torvalds
parent a6b91919e0
commit 08ca0db8aa
1 changed files with 11 additions and 0 deletions
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11
fs/isofs/compress.c
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@ -72,6 +72,17 @@ static int zisofs_readpage(struct file *file, struct page *page)
offset = index & ~zisofs_block_page_mask;
blockindex = offset >> zisofs_block_page_shift;
maxpage = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
/*
* If this page is wholly outside i_size we just return zero;
* do_generic_file_read() will handle this for us
*/
if (page->index >= maxpage) {
SetPageUptodate(page);
unlock_page(page);
return 0;
}
maxpage = min(zisofs_block_pages, maxpage-offset);
for ( i = 0 ; i < maxpage ; i++, offset++ ) {