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| author | NeilBrown <neilb@suse.com> | 2017-01-30 17:17:00 +1100 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2017-02-06 17:29:22 -0500 |
| commit | b880092109323d1cc608c420fa712d3e19508e13 (patch) | |
| tree | 72b71f8ba1a047c2302cfabd3d6383471ddf145b /fs/nfsd | |
| parent | 32ddd944a056c786f6acdd95ed29e994adc613a2 (diff) | |
| download | linux-stable-b880092109323d1cc608c420fa712d3e19508e13.tar.gz linux-stable-b880092109323d1cc608c420fa712d3e19508e13.tar.bz2 linux-stable-b880092109323d1cc608c420fa712d3e19508e13.zip | |
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.c | 10 |
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); |