[PATCH 2/6] 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, and call them for the ADMIN_REVOKED versions of state id.
This use primarily useful for debugging - to ensure states are being
removed eventually.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 fs/nfsd/nfs4state.c | 78 ++++++++++++++++++++++-----------------------
 1 file changed, 38 insertions(+), 40 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index f3ba53a16105..e15d35c57991 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2679,17 +2679,10 @@ 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, ");
@@ -2704,14 +2697,17 @@ 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);
 	seq_printf(s, " }\n");
-out:
-	spin_unlock(&nf->fi_lock);
 	return 0;
 }
 
@@ -2725,30 +2721,29 @@ 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);
 	seq_printf(s, " }\n");
-out:
 	spin_unlock(&nf->fi_lock);
 	return 0;
 }
@@ -2761,27 +2756,27 @@ 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);
+	seq_puts(s, " }\n");
 	return 0;
 }
 
@@ -2813,10 +2808,13 @@ static int states_show(struct seq_file *s, void *v)
 
 	switch (st->sc_type) {
 	case NFS4_OPEN_STID:
+	case NFS4_ADMIN_REVOKED_STID:
 		return nfs4_show_open(s, st);
 	case NFS4_LOCK_STID:
+	case NFS4_ADMIN_REVOKED_LOCK_STID:
 		return nfs4_show_lock(s, st);
 	case NFS4_DELEG_STID:
+	case NFS4_ADMIN_REVOKED_DELEG_STID:
 		return nfs4_show_deleg(s, st);
 	case NFS4_LAYOUT_STID:
 		return nfs4_show_layout(s, st);
-- 
2.42.0