[PATCH] 9P: always use cached inode to fill in v9fs_vfs_getattr

[Julio Montes]

BugLink: https://bugs.launchpad.net/ubuntu/+source/linux-kvm/+bug/1777137

So that if in cache=none mode, we don't have to lookup server that
might not support open-unlink-fstat operation.

fixes https://github.com/01org/cc-oci-runtime/issues/47
fixes https://github.com/01org/cc-oci-runtime/issues/1062

Signed-off-by: Peng Tao <bergwolf at gmail.com>
Acked-by: Julio Montes <julio.montes at intel.com>
---
 fs/9p/vfs_inode.c      | 2 +-
 fs/9p/vfs_inode_dotl.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index bdabb2765d1b..30395e05e5f9 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1068,7 +1068,7 @@ v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
 
 	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 	v9ses = v9fs_dentry2v9ses(dentry);
-	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
+	if (!d_really_is_negative(dentry) || v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 		generic_fillattr(d_inode(dentry), stat);
 		return 0;
 	}
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 7f6ae21a27b3..5d7e970a6e88 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -481,7 +481,7 @@ v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
 
 	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 	v9ses = v9fs_dentry2v9ses(dentry);
-	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
+	if (!d_really_is_negative(dentry) || v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 		generic_fillattr(d_inode(dentry), stat);
 		return 0;
 	}
-- 
2.13.6