[PATCH 6/6] nfs: Enable swap over NFS

Peter Zijlstra
2006-08-25T15:43:27Z

Now that NFS can handle swap cache pages, add a swapfile method to allow
swapping over NFS.

NOTE: this dummy method is obviously not enough to make it safe.
A more complete version of the nfs_swapfile() function will be present
in the next VM deadlock avoidance patches.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
fs/nfs/file.c | 6 ++++++
1 file changed, 6 insertions(+)

Index: linux-2.6/fs/nfs/file.c
===================================================================
--- linux-2.6.orig/fs/nfs/file.c
+++ linux-2.6/fs/nfs/file.c
@@ -315,6 +315,11 @@ static int nfs_release_page(struct page
return !nfs_wb_page(page_file_mapping(page)->host, page);
}

+static int nfs_swapfile(struct address_space *mapping, int enable)
+{
+ return 0;
+}
+
const struct address_space_operations nfs_file_aops = {
.readpage = nfs_readpage,
.readpages = nfs_readpages,
@@ -328,6 +333,7 @@ const struct address_space_operations nf
#ifdef CONFIG_NFS_DIRECTIO
.direct_IO = nfs_direct_IO,
#endif
+ .swapfile = nfs_swapfile,
};

/*