[PATCH 07/15] gfs2: use page_offset in gfs2_page_mkwrite

Christoph Hellwig
2019-07-01T21:55:44Z

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 <hch@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