pnfs: align layoutget requests on page boundaries

Signed-off-by: Benny Halevy <bhalevy@panasas.com>

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index c2f09e9..2357ee3 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -850,6 +850,7 @@ pnfs_update_layout(struct inode *ino,
                .offset = pos,
                .length = count,
        };
+       unsigned pg_offset;
        struct nfs_inode *nfsi = NFS_I(ino);
        struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
        struct pnfs_layout_hdr *lo;
@@ -899,6 +900,13 @@ pnfs_update_layout(struct inode *ino,
                spin_unlock(&clp->cl_lock);
        }
 
+       pg_offset = arg.offset & ~PAGE_CACHE_MASK;
+       if (pg_offset) {
+               arg.offset -= pg_offset;
+               arg.length += pg_offset;
+       }
+       arg.length = PAGE_CACHE_ALIGN(arg.length);
+
        lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
        if (!lseg && first) {
                spin_lock(&clp->cl_lock);