NFS: Don't fail an O_DIRECT read/write if get_user_pages() returns pages
There is no need to fail the entire O_DIRECT read/write just because
get_user_pages() returned fewer pages than we requested.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 4c97e55..f1b153a 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -295,9 +295,14 @@
break;
}
if ((unsigned)result < data->npages) {
- nfs_direct_release_pages(data->pagevec, result);
- nfs_readdata_release(data);
- break;
+ bytes = result * PAGE_SIZE;
+ if (bytes <= pgbase) {
+ nfs_direct_release_pages(data->pagevec, result);
+ nfs_readdata_release(data);
+ break;
+ }
+ bytes -= pgbase;
+ data->npages = result;
}
get_dreq(dreq);
@@ -630,9 +635,14 @@
break;
}
if ((unsigned)result < data->npages) {
- nfs_direct_release_pages(data->pagevec, result);
- nfs_writedata_release(data);
- break;
+ bytes = result * PAGE_SIZE;
+ if (bytes <= pgbase) {
+ nfs_direct_release_pages(data->pagevec, result);
+ nfs_writedata_release(data);
+ break;
+ }
+ bytes -= pgbase;
+ data->npages = result;
}
get_dreq(dreq);