GFS2: Fix typo in gfs_page_mkwrite()

There is a typo in gfs2_page_mkwrite()

gfs2_write_alloc_required() expects pos to be the offset in bytes. However,
instead of the page index being shifted by by PAGE_CACHE_SHIFT, it was shifted
by (PAGE_CACHE_SIZE - inode->i_blkbits).  This patch simply shifts the page
index by the proper amount.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index 289c5f54ba53..93fe41b67f97 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -342,7 +342,7 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
         struct gfs2_inode *ip = GFS2_I(inode);
         struct gfs2_sbd *sdp = GFS2_SB(inode);
         unsigned long last_index;
-        u64 pos = page->index << (PAGE_CACHE_SIZE - inode->i_blkbits);
+        u64 pos = page->index << PAGE_CACHE_SHIFT;
         unsigned int data_blocks, ind_blocks, rblocks;
         int alloc_required = 0;
         struct gfs2_holder gh;