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Commit 9d1e9232 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: Some NFSv4 servers have broken behaviour for the change attribute 



The Linux NFSv4 server violates RFC3530 in that the change attribute is not
guaranteed to be updated for every change to the inode. Our optimisation
for checking whether or not the inode metadata has changed or not is broken
too. Grr....

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 1de3fc12

fs/nfs/inode.c

+9 −13
Original line number Diff line number Diff line
@@ -1414,9 +1414,8 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat 
	/* Do atomic weak cache consistency updates */

	nfs_wcc_update_inode(inode, fattr);



	if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0) {

		if (nfsi->change_attr == fattr->change_attr)

			goto out;

	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;
@@ -1444,7 +1443,6 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat 
	if (inode->i_nlink != fattr->nlink)

		nfsi->cache_validity |= NFS_INO_INVALID_ATTR;



out:

	if (!timespec_equal(&inode->i_atime, &fattr->atime))

		nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
@@ -1612,15 +1610,13 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 
 		inode->i_blksize = fattr->du.nfs2.blocksize;

 	}



	if ((fattr->valid & NFS_ATTR_FATTR_V4)) {

		if (nfsi->change_attr != fattr->change_attr) {

	if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&

			nfsi->change_attr != fattr->change_attr) {

		dprintk("NFS: change_attr change on server for file %s/%ld\n",

				inode->i_sb->s_id, inode->i_ino);

		nfsi->change_attr = fattr->change_attr;

		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;

		nfsi->cache_change_attribute = jiffies;

		} else

			invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA);

	}



	/* Update attrtimeo value if we're out of the unstable period */