[PATCH 5/9] nfsd: allow admin-revoked state to appear in /proc/fs/nfsd/clients/*/states

[NeilBrown <neilb@suse.de>]

Change the "show" functions to show some content even if a file cannot
be found.
This is primarily useful for debugging - to ensure states are being
removed eventually.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 fs/nfsd/nfs4state.c | 81 +++++++++++++++++++++++----------------------
 1 file changed, 41 insertions(+), 40 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index a2b3320a6ba8..8debd148840f 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2680,17 +2680,10 @@ static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
 	struct nfs4_stateowner *oo;
 	unsigned int access, deny;
 
-	if (st->sc_type != NFS4_OPEN_STID && st->sc_type != NFS4_LOCK_STID)
-		return 0; /* XXX: or SEQ_SKIP? */
 	ols = openlockstateid(st);
 	oo = ols->st_stateowner;
 	nf = st->sc_file;
 
-	spin_lock(&nf->fi_lock);
-	file = find_any_file_locked(nf);
-	if (!file)
-		goto out;
-
 	seq_printf(s, "- ");
 	nfs4_show_stateid(s, &st->sc_stateid);
 	seq_printf(s, ": { type: open, ");
@@ -2705,14 +2698,19 @@ static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
 		deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
 		deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
 
-	nfs4_show_superblock(s, file);
-	seq_printf(s, ", ");
-	nfs4_show_fname(s, file);
-	seq_printf(s, ", ");
+	spin_lock(&nf->fi_lock);
+	file = find_any_file_locked(nf);
+	if (file) {
+		nfs4_show_superblock(s, file);
+		seq_puts(s, ", ");
+		nfs4_show_fname(s, file);
+		seq_puts(s, ", ");
+	}
+	spin_unlock(&nf->fi_lock);
 	nfs4_show_owner(s, oo);
+	if (st->sc_status & NFS4_STID_ADMIN_REVOKED)
+		seq_puts(s, ", admin-revoked");
 	seq_printf(s, " }\n");
-out:
-	spin_unlock(&nf->fi_lock);
 	return 0;
 }
 
@@ -2726,30 +2724,31 @@ static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
 	ols = openlockstateid(st);
 	oo = ols->st_stateowner;
 	nf = st->sc_file;
-	spin_lock(&nf->fi_lock);
-	file = find_any_file_locked(nf);
-	if (!file)
-		goto out;
 
 	seq_printf(s, "- ");
 	nfs4_show_stateid(s, &st->sc_stateid);
 	seq_printf(s, ": { type: lock, ");
 
-	/*
-	 * Note: a lock stateid isn't really the same thing as a lock,
-	 * it's the locking state held by one owner on a file, and there
-	 * may be multiple (or no) lock ranges associated with it.
-	 * (Same for the matter is true of open stateids.)
-	 */
+	spin_lock(&nf->fi_lock);
+	file = find_any_file_locked(nf);
+	if (file) {
+		/*
+		 * Note: a lock stateid isn't really the same thing as a lock,
+		 * it's the locking state held by one owner on a file, and there
+		 * may be multiple (or no) lock ranges associated with it.
+		 * (Same for the matter is true of open stateids.)
+		 */
 
-	nfs4_show_superblock(s, file);
-	/* XXX: open stateid? */
-	seq_printf(s, ", ");
-	nfs4_show_fname(s, file);
-	seq_printf(s, ", ");
+		nfs4_show_superblock(s, file);
+		/* XXX: open stateid? */
+		seq_puts(s, ", ");
+		nfs4_show_fname(s, file);
+		seq_puts(s, ", ");
+	}
 	nfs4_show_owner(s, oo);
+	if (st->sc_status & NFS4_STID_ADMIN_REVOKED)
+		seq_puts(s, ", admin-revoked");
 	seq_printf(s, " }\n");
-out:
 	spin_unlock(&nf->fi_lock);
 	return 0;
 }
@@ -2762,27 +2761,29 @@ static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
 
 	ds = delegstateid(st);
 	nf = st->sc_file;
-	spin_lock(&nf->fi_lock);
-	file = nf->fi_deleg_file;
-	if (!file)
-		goto out;
 
 	seq_printf(s, "- ");
 	nfs4_show_stateid(s, &st->sc_stateid);
 	seq_printf(s, ": { type: deleg, ");
 
 	/* Kinda dead code as long as we only support read delegs: */
-	seq_printf(s, "access: %s, ",
-		ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
+	seq_printf(s, "access: %s",
+		   ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
 
 	/* XXX: lease time, whether it's being recalled. */
 
-	nfs4_show_superblock(s, file);
-	seq_printf(s, ", ");
-	nfs4_show_fname(s, file);
-	seq_printf(s, " }\n");
-out:
+	spin_lock(&nf->fi_lock);
+	file = nf->fi_deleg_file;
+	if (file) {
+		seq_puts(s, ", ");
+		nfs4_show_superblock(s, file);
+		seq_puts(s, ", ");
+		nfs4_show_fname(s, file);
+	}
 	spin_unlock(&nf->fi_lock);
+	if (st->sc_status & NFS4_STID_ADMIN_REVOKED)
+		seq_puts(s, ", admin-revoked");
+	seq_puts(s, " }\n");
 	return 0;
 }
 
-- 
2.42.0