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authorDave Young <hidave.darkstar@gmail.com>2008-03-19 20:01:01 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-03-19 21:53:36 -0400
commit08ca0db8aa2db4ddcf487d46d85dc8ffb22162cc (patch)
tree3cb882dd0bc473bcb397752c9894d35ec0a918d7 /fs/isofs/compress.c
parenta6b91919e0881a0d0a4ae5211d5c879a8c7ca92b (diff)
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>
Diffstat (limited to 'fs/isofs/compress.c')
-rw-r--r--fs/isofs/compress.c11
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)
72 offset = index & ~zisofs_block_page_mask; 72 offset = index & ~zisofs_block_page_mask;
73 blockindex = offset >> zisofs_block_page_shift; 73 blockindex = offset >> zisofs_block_page_shift;
74 maxpage = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 74 maxpage = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
75
76 /*
77 * If this page is wholly outside i_size we just return zero;
78 * do_generic_file_read() will handle this for us
79 */
80 if (page->index >= maxpage) {
81 SetPageUptodate(page);
82 unlock_page(page);
83 return 0;
84 }
85
75 maxpage = min(zisofs_block_pages, maxpage-offset); 86 maxpage = min(zisofs_block_pages, maxpage-offset);
76 87
77 for ( i = 0 ; i < maxpage ; i++, offset++ ) { 88 for ( i = 0 ; i < maxpage ; i++, offset++ ) {