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| author | Dave Young <hidave.darkstar@gmail.com> | 2008-03-20 03:01:01 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-03-20 04:53:36 +0300 |
| commit | 08ca0db8aa2db4ddcf487d46d85dc8ffb22162cc (patch) | |
| tree | 3cb882dd0bc473bcb397752c9894d35ec0a918d7 | |
| parent | a6b91919e0881a0d0a4ae5211d5c879a8c7ca92b (diff) | |
| download | linux-08ca0db8aa2db4ddcf487d46d85dc8ffb22162cc.tar.xz | |
zisofs: fix readpage() outside i_size
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>
| -rw-r--r-- | fs/isofs/compress.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c index 37dbd6404787..defb932eee9a 100644 --- a/fs/isofs/compress.c +++ b/fs/isofs/compress.c @@ -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++ ) { |