[PATCH] cifs: drop the lease for cached directories on rmdir or rename

[Ronnie Sahlberg <lsahlber@redhat.com>]

When we delete or rename a directory we must also drop any cached lease we have
on the directory.

Fixes: a350d6e73f5e ("cifs: enable caching of directories for which a lease
is held")
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 fs/cifs/cached_dir.c | 21 +++++++++++++++++++++
 fs/cifs/cached_dir.h |  4 ++++
 fs/cifs/smb2inode.c  |  2 ++
 3 files changed, 27 insertions(+)

diff --git a/fs/cifs/cached_dir.c b/fs/cifs/cached_dir.c
index ffc924296e59..6e689c4c8d1b 100644
--- a/fs/cifs/cached_dir.c
+++ b/fs/cifs/cached_dir.c
@@ -340,6 +340,27 @@ smb2_close_cached_fid(struct kref *ref)
 	free_cached_dir(cfid);
 }
 
+void drop_cached_dir_by_name(const unsigned int xid, struct cifs_tcon *tcon,
+			     const char *name, struct cifs_sb_info *cifs_sb)
+{
+	struct cached_fid *cfid = NULL;
+	int rc;
+
+	rc = open_cached_dir(xid, tcon, name, cifs_sb, true, &cfid);
+	if (rc) {
+		cifs_dbg(FYI, "no cached dir found for rmdir(%s)\n", name);
+		return;
+	}
+	spin_lock(&cfid->cfids->cfid_list_lock);
+	if (cfid->has_lease) {
+		cfid->has_lease = false;
+		kref_put(&cfid->refcount, smb2_close_cached_fid);
+	}
+	spin_unlock(&cfid->cfids->cfid_list_lock);
+	close_cached_dir(cfid);
+}
+
+
 void close_cached_dir(struct cached_fid *cfid)
 {
 	kref_put(&cfid->refcount, smb2_close_cached_fid);
diff --git a/fs/cifs/cached_dir.h b/fs/cifs/cached_dir.h
index e536304ca2ce..2f4e764c9ca9 100644
--- a/fs/cifs/cached_dir.h
+++ b/fs/cifs/cached_dir.h
@@ -69,6 +69,10 @@ extern int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
 				     struct dentry *dentry,
 				     struct cached_fid **cfid);
 extern void close_cached_dir(struct cached_fid *cfid);
+extern void drop_cached_dir_by_name(const unsigned int xid,
+				    struct cifs_tcon *tcon,
+				    const char *name,
+				    struct cifs_sb_info *cifs_sb);
 extern void close_all_cached_dirs(struct cifs_sb_info *cifs_sb);
 extern void invalidate_all_cached_dirs(struct cifs_tcon *tcon);
 extern int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16]);
diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
index a6640e6ea58b..68e08c85fbb8 100644
--- a/fs/cifs/smb2inode.c
+++ b/fs/cifs/smb2inode.c
@@ -655,6 +655,7 @@ int
 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 	   struct cifs_sb_info *cifs_sb)
 {
+	drop_cached_dir_by_name(xid, tcon, name, cifs_sb);
 	return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 				CREATE_NOT_FILE, ACL_NO_MODE,
 				NULL, SMB2_OP_RMDIR, NULL, NULL, NULL);
@@ -698,6 +699,7 @@ smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 {
 	struct cifsFileInfo *cfile;
 
+	drop_cached_dir_by_name(xid, tcon, from_name, cifs_sb);
 	cifs_get_writable_path(tcon, from_name, FIND_WR_WITH_DELETE, &cfile);
 
 	return smb2_set_path_attr(xid, tcon, from_name, to_name,
-- 
2.35.3