1 files changed, 44 insertions, 2 deletions

diff --git a/fs/smb/client/dir.c b/fs/smb/client/dir.c
index 47710aa13822..fc67a6441c96 100644
--- a/fs/smb/client/dir.c
+++ b/fs/smb/client/dir.c
@@ -322,13 +322,14 @@ retry_open:
 		list_for_each_entry(parent_cfid, &tcon->cfids->entries, entry) {
 			if (parent_cfid->dentry == direntry->d_parent) {
 				cifs_dbg(FYI, "found a parent cached file handle\n");
-				if (parent_cfid->has_lease && parent_cfid->time) {
+				if (is_valid_cached_dir(parent_cfid)) {
 					lease_flags
 						|= SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE;
 					memcpy(fid->parent_lease_key,
 					       parent_cfid->fid.lease_key,
 					       SMB2_LEASE_KEY_SIZE);
 					parent_cfid->dirents.is_valid = false;
+					parent_cfid->dirents.is_failed = true;
 				}
 				break;
 			}
@@ -677,6 +678,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 	const char *full_path;
 	void *page;
 	int retry_count = 0;
+	struct cached_fid *cfid = NULL;
 
 	xid = get_xid();
 
@@ -716,6 +718,28 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 		cifs_dbg(FYI, "non-NULL inode in lookup\n");
 	} else {
 		cifs_dbg(FYI, "NULL inode in lookup\n");
+
+		/*
+		 * We can only rely on negative dentries having the same
+		 * spelling as the cached dirent if case insensitivity is
+		 * forced on mount.
+		 *
+		 * XXX: if servers correctly announce Case Sensitivity Search
+		 * on GetInfo of FileFSAttributeInformation, then we can take
+		 * correct action even if case insensitive is not forced on
+		 * mount.
+		 */
+		if (pTcon->nocase && !open_cached_dir_by_dentry(pTcon, direntry->d_parent, &cfid)) {
+			/*
+			 * dentry is negative and parent is fully cached:
+			 * we can assume file does not exist
+			 */
+			if (cfid->dirents.is_valid) {
+				close_cached_dir(cfid);
+				goto out;
+			}
+			close_cached_dir(cfid);
+		}
 	}
 	cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
 		 full_path, d_inode(direntry));
@@ -749,6 +773,8 @@ again:
 		}
 		newInode = ERR_PTR(rc);
 	}
+
+out:
 	free_dentry_path(page);
 	cifs_put_tlink(tlink);
 	free_xid(xid);
@@ -759,7 +785,8 @@ static int
 cifs_d_revalidate(struct inode *dir, const struct qstr *name,
 		  struct dentry *direntry, unsigned int flags)
 {
-	struct inode *inode;
+	struct inode *inode = NULL;
+	struct cached_fid *cfid;
 	int rc;
 
 	if (flags & LOOKUP_RCU)
@@ -806,6 +833,21 @@ cifs_d_revalidate(struct inode *dir, const struct qstr *name,
 
 			return 1;
 		}
+	} else {
+		struct cifs_sb_info *cifs_sb = CIFS_SB(dir->i_sb);
+		struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+
+		if (!open_cached_dir_by_dentry(tcon, direntry->d_parent, &cfid)) {
+			/*
+			 * dentry is negative and parent is fully cached:
+			 * we can assume file does not exist
+			 */
+			if (cfid->dirents.is_valid) {
+				close_cached_dir(cfid);
+				return 1;
+			}
+			close_cached_dir(cfid);
+		}
 	}
 
 	/*