Without casting page->index to a guaranteed 64-bit type the value might be treated as 32-bit on 32-bit platforms and thus get truncated.
Signed-off-by: Christoph Hellwig <h...@lst.de> --- fs/gfs2/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 1cb0c3afd3dc..282a4aaab900 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -424,7 +424,7 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf) struct gfs2_sbd *sdp = GFS2_SB(inode); struct gfs2_alloc_parms ap = { .aflags = 0, }; unsigned long last_index; - u64 pos = page->index << PAGE_SHIFT; + u64 pos = page_offset(page); unsigned int data_blocks, ind_blocks, rblocks; struct gfs2_holder gh; loff_t size; -- 2.20.1