NFS: Fix page cache revalidation

Fix up a bug in the handling of NFS_INO_REVAL_PAGECACHE: make sure that
nfs_update_inode() clears it when we're sure we're not racing with other
updates.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 4f12c57..eddd0e9 100644 (file)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1406,18 +1406,12 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat
        nfs_wcc_update_inode(inode, fattr);
 
        if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
-                       nfsi->change_attr != fattr->change_attr) {
-               nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
-               if (!data_unstable)
-                       nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
-       }
+                       nfsi->change_attr != fattr->change_attr)
+               nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
 
        /* Verify a few of the more important attributes */
-       if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
-               nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
-               if (!data_unstable)
-                       nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
-       }
+       if (!timespec_equal(&inode->i_mtime, &fattr->mtime))
+               nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
 
        cur_size = i_size_read(inode);
        new_isize = nfs_size_to_loff_t(fattr->size);
@@ -1459,7 +1453,6 @@ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
        if ((fattr->valid & NFS_ATTR_FATTR) == 0)
                return 0;
        spin_lock(&inode->i_lock);
-       nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
        if (time_after(fattr->time_start, nfsi->last_updated))
                status = nfs_update_inode(inode, fattr);
        else
@@ -1484,7 +1477,7 @@ int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 
        spin_lock(&inode->i_lock);
        if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
-               nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
+               nfsi->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
                goto out;
        }
        status = nfs_update_inode(inode, fattr);
@@ -1534,7 +1527,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
        /* Are we racing with known updates of the metadata on the server? */
        data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
        if (data_stable)
-               nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
+               nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATIME);
 
        /* Do atomic weak cache consistency updates */
        nfs_wcc_update_inode(inode, fattr);