Cache the underlying filesystem capabilities at connection time.

This change alters the Samba connection code to cache the filesystem
capabilities when a new client connects. This can be used to enable
filesystem specific optimisations is a general manner.
(This used to be commit de3c5b808a941ac8e9ebe7169536d8290067eef5)

2 files changed, 19 insertions, 0 deletions

diff --git a/source3/include/smb.h b/source3/include/smb.h
index 1222c9a73a..63ae51ecd4 100644
--- a/source3/include/smb.h
+++ b/source3/include/smb.h
@@ -658,10 +658,14 @@ typedef struct connection_struct {
 	int num_files_open;
 	unsigned int num_smb_operations; /* Count of smb operations on this tree. */
 
+	/* Semantics requested by the client or forced by the server config. */
 	bool case_sensitive;
 	bool case_preserve;
 	bool short_case_preserve;
 
+	/* Semantics provided by the underlying filesystem. */
+	int fs_capabilities;
+
 	name_compare_entry *hide_list; /* Per-share list of files to return as hidden. */
 	name_compare_entry *veto_list; /* Per-share list of files to veto (never show). */
 	name_compare_entry *veto_oplock_list; /* Per-share list of files to refuse oplocks on. */       
diff --git a/source3/smbd/service.c b/source3/smbd/service.c
index ed43528c76..8e69a3b381 100644
--- a/source3/smbd/service.c
+++ b/source3/smbd/service.c
@@ -1165,6 +1165,21 @@ static connection_struct *make_connection_snum(int snum, user_struct *vuser,
 	}
 #endif
 
+	/* Figure out the characteristics of the underlying filesystem. This
+	 * assumes that all the filesystem mounted withing a share path have
+	 * the same characteristics, which is likely but not guaranteed.
+	 */
+	{
+		vfs_statvfs_struct svfs;
+
+		conn->fs_capabilities =
+		    FILE_CASE_SENSITIVE_SEARCH | FILE_CASE_PRESERVED_NAMES;
+
+		if (SMB_VFS_STATVFS(conn, conn->connectpath, &svfs) == 0) {
+			conn->fs_capabilities = svfs.FsCapabilities;
+		}
+	}
+
 	/*
 	 * Print out the 'connected as' stuff here as we need
 	 * to know the effective uid and gid we will be using