NFS: Don't write enable new pages while an invalidation is proceeding

nfs_vm_page_mkwrite() should wait until the page cache invalidation
is finished. This is the second patch in a 2 patch series to deprecate
the NFS client's reliance on nfs_release_page() in the context of
nfs_invalidate_mapping().

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 41963ff..e679d24 100644 (file)
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -623,6 +623,9 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
        /* make sure the cache has finished storing the page */
        nfs_fscache_wait_on_page_write(NFS_I(inode), page);
 
+       wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
+                       nfs_wait_bit_killable, TASK_KILLABLE);
+
        lock_page(page);
        mapping = page_file_mapping(page);
        if (mapping != inode->i_mapping)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 8edb7d0..d42dff6 100644 (file)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1035,6 +1035,7 @@ static int nfs_invalidate_mapping(struct inode *inode, struct address_space *map
 
        if (mapping->nrpages != 0) {
                if (S_ISREG(inode->i_mode)) {
+                       unmap_mapping_range(mapping, 0, 0, 0);
                        ret = nfs_sync_mapping(mapping);
                        if (ret < 0)
                                return ret;