Add fsetxattr(), fremovexattr(), open_by_handle_at(), and "virtiofsd demo"

Mostly assorted fixes, a new FDGET operation (get a copy of the
target file descriptor via pidfd_getfd()) and a new "FD" flag that
means we have to do that on direct tag reference.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

2 files changed, 28 insertions, 10 deletions

diff --git a/common/gluten.h b/common/gluten.h
index 1414d9e..d06362a 100644
--- a/common/gluten.h
+++ b/common/gluten.h
@@ -21,10 +21,10 @@
 
 extern struct seccomp_data anonymous_seccomp_data;
 
-#define HEADER_SIZE		65536
-#define INST_SIZE		65536
-#define RO_DATA_SIZE		65536
-#define DATA_SIZE		65536
+#define HEADER_SIZE		(1 << 20)
+#define INST_SIZE		(1 << 20)
+#define RO_DATA_SIZE		(1 << 20)
+#define DATA_SIZE		(1 << 20)
 
 #define INST_MAX		256
 #define OFFSET_MAX                                       \
@@ -67,13 +67,14 @@ enum op_type {
 	OP_CALL,
 	OP_COPY,
 	OP_FD,
+	OP_FDGET,
 	OP_RETURN,
 	OP_LOAD,
 	OP_STORE,
 	OP_IOVLOAD,
 	OP_BITWISE,
 	OP_CMP,
-	OP_RESOLVEDFD,
+	OP_RESOLVEFD,
 };
 
 /**
@@ -199,6 +200,11 @@ struct op_fd {
 	struct gluten_offset desc;	/* struct fd_desc */
 };
 
+struct op_fdget {
+	struct gluten_offset src;
+	struct gluten_offset dst;
+};
+
 struct op_load {
 	struct gluten_offset src;
 	struct gluten_offset dst;
@@ -261,14 +267,23 @@ struct op_bitwise {
 	struct gluten_offset desc;	/* struct bitwise_desc */
 };
 
+enum resolvefd_type {
+	RESOLVEFD_PATH,
+	RESOLVEFD_MOUNT,
+	RESOLVEFD_MAX = RESOLVEFD_MOUNT,
+};
+
+extern const char *resolvefd_type_str[RESOLVEFD_MAX + 1];
+
 struct resolvefd_desc {
-        struct gluten_offset fd;
-        struct gluten_offset path;
-        size_t path_max;
+	struct gluten_offset fd;
+	struct gluten_offset path;
+	enum resolvefd_type type;
+	size_t path_max;
 };
 
 struct op_resolvefd {
-	struct gluten_offset desc;
+	struct gluten_offset desc;	/* struct resolvefd_desc */
 };
 
 struct op_copy {
@@ -284,6 +299,7 @@ struct op {
 		struct op_call call;
 		struct op_return ret;
 		struct op_fd fd;
+		struct op_fdget fdget;
 		struct op_load load;
 		struct op_store store;
 		struct op_iovload iovload;
diff --git a/common/util.c b/common/util.c
index 94aeea3..3164126 100644
--- a/common/util.c
+++ b/common/util.c
@@ -54,11 +54,13 @@ const char *context_spec_type_name[CONTEXT_SPEC_TYPE_MAX + 1] = {
 const char *bitwise_type_str[BITWISE_MAX + 1] = { "&", "|" };
 
 const char *cmp_type_str[CMP_MAX + 1] = {
-        "EQ", "NE", "GT", "GE", "LT", "LE",
+	"EQ", "NE", "GT", "GE", "LT", "LE",
 };
 
 const char *metadata_type_str[METADATA_MAX + 1] = { "uid", "gid", "pid" };
 
+const char *resolvefd_type_str[RESOLVEFD_MAX + 1] = { "path", "mount" };
+
 const char *syscall_name(long nr) {
 	struct call **set, *call;