[PATCH 03/11] cachefiles: set default tag name if it's unspecified

[David Howells <dhowells@redhat.com>]

From: Jeffle Xu <jefflexu@linux.alibaba.com>

fscache_acquire_cache() requires a non-empty name, while 'tag <name>'
command is optional for cachefilesd.

Thus set default tag name if it's unspecified to avoid the regression of
cachefilesd. The logic is the same with that before rewritten.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---

 fs/cachefiles/daemon.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index 40a792421fc1..7ac04ee2c0a0 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -703,6 +703,17 @@ static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
 		return -EBUSY;
 	}
 
+	/* Make sure we have copies of the tag string */
+	if (!cache->tag) {
+		/*
+		 * The tag string is released by the fops->release()
+		 * function, so we don't release it on error here
+		 */
+		cache->tag = kstrdup("CacheFiles", GFP_KERNEL);
+		if (!cache->tag)
+			return -ENOMEM;
+	}
+
 	return cachefiles_add_cache(cache);
 }