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authorNeilBrown <neilb@suse.com>2017-01-30 17:17:00 +1100
committerJ. Bruce Fields <bfields@redhat.com>2017-02-06 17:29:22 -0500
commitb880092109323d1cc608c420fa712d3e19508e13 (patch)
tree72b71f8ba1a047c2302cfabd3d6383471ddf145b /fs/nfsd
parent32ddd944a056c786f6acdd95ed29e994adc613a2 (diff)
downloadlinux-b880092109323d1cc608c420fa712d3e19508e13.tar.bz2
NFSDv4: use export cache flushtime for changeid on V4ROOT objects.
If you change the set of filesystems that are exported, then the contents of various directories in the NFSv4 pseudo-root is likely to change. However the change-id of those directories is currently tied to the underlying directory, so the client may not see the changes in a timely fashion. This patch changes the change-id number to be derived from the "flush_time" of the export cache. Whenever any changes are made to the set of exported filesystems, this flush_time is updated. The result is that clients see changes to the set of exported filesystems much more quickly, often immediately. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4xdr.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 3cc190755958..7e4df80456ff 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1966,9 +1966,13 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
DECODE_TAIL;
}
-static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
+static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
+ struct svc_export *exp)
{
- if (IS_I_VERSION(inode)) {
+ if (exp->ex_flags & NFSEXP_V4ROOT) {
+ *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
+ *p++ = 0;
+ } else if (IS_I_VERSION(inode)) {
p = xdr_encode_hyper(p, inode->i_version);
} else {
*p++ = cpu_to_be32(stat->ctime.tv_sec);
@@ -2493,7 +2497,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
- p = encode_change(p, &stat, d_inode(dentry));
+ p = encode_change(p, &stat, d_inode(dentry), exp);
}
if (bmval0 & FATTR4_WORD0_SIZE) {
p = xdr_reserve_space(xdr, 8);