[Libguestfs] [PATCH libnbd v2 1/5] generator: Change Closure so it describes single callbacks.
Richard W.M. Jones
rjones at redhat.com
Wed Jul 24 16:54:39 UTC 2019
In preparation for closure lifetimes, split up the Closure so it no
longer describes a list of closures, but a single callback.
This changes the API because functions which take 2 or more closures
now pass a separate user_data for each one.
---
docs/libnbd.pod | 3 +-
examples/strict-structured-reads.c | 2 +-
generator/generator | 760 ++++++++++++----------------
generator/states-reply-simple.c | 2 +-
generator/states-reply-structured.c | 8 +-
lib/internal.h | 3 +-
lib/rw.c | 32 +-
7 files changed, 364 insertions(+), 446 deletions(-)
diff --git a/docs/libnbd.pod b/docs/libnbd.pod
index 5608e63..631bb3b 100644
--- a/docs/libnbd.pod
+++ b/docs/libnbd.pod
@@ -487,8 +487,7 @@ C<nbd_set_debug_callback>, C<nbd_pread_callback>). Libnbd can call
these functions while processing.
Callbacks have an opaque C<void *user_data> pointer. This is passed
-as the first parameter to the callback. libnbd functions that take
-two callback pointers share the same opaque data for both calls.
+as the first parameter to the callback.
The callbacks are invoked at a point where the libnbd lock is held; as
such, it is unsafe for the callback to call any C<nbd_*> APIs on the
diff --git a/examples/strict-structured-reads.c b/examples/strict-structured-reads.c
index 92eb3e6..a50f662 100644
--- a/examples/strict-structured-reads.c
+++ b/examples/strict-structured-reads.c
@@ -225,7 +225,7 @@ main (int argc, char *argv[])
*d = (struct data) { .offset = offset, .count = maxsize, .flags = flags,
.remaining = r, };
if (nbd_aio_pread_structured_callback (nbd, buf, sizeof buf, offset,
- read_chunk, read_verify, d,
+ read_chunk, d, read_verify, d,
flags) == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
diff --git a/generator/generator b/generator/generator
index fdacd71..3b57713 100755
--- a/generator/generator
+++ b/generator/generator
@@ -849,10 +849,10 @@ and arg =
written by the function *)
| BytesPersistIn of string * string (* same as above, but buffer persists *)
| BytesPersistOut of string * string
-| Closure of bool * closure list (* void *opaque + one or more closures
- flag if true means callbacks persist
- in the handle, false means they only
- exist during the function call *)
+| Closure of bool * closure (* function pointer + void *opaque
+ flag if true means callbacks persist
+ in the handle, false means they only
+ exist during the function call *)
| Flags of string (* NBD_CMD_FLAG_* flags *)
| Int of string (* small int *)
| Int64 of string (* 64 bit signed int *)
@@ -921,8 +921,8 @@ Return the state of the debug flag on this handle.";
"set_debug_callback", {
default_call with
args = [ Closure (true,
- [{ cbname="debug_fn";
- cbargs=[String "context"; String "msg"] }]) ];
+ { cbname="debug_fn";
+ cbargs=[String "context"; String "msg"] }) ];
ret = RErr;
shortdesc = "set the debug callback";
longdesc = "\
@@ -1351,10 +1351,10 @@ protocol extensions).";
default_call with
args = [ BytesOut ("buf", "count"); UInt64 "offset";
Closure (false,
- [{ cbname="chunk";
- cbargs=[BytesIn ("subbuf", "count");
- UInt64 "offset"; Int "status";
- Mutable (Int "error")] }]);
+ { cbname="chunk";
+ cbargs=[BytesIn ("subbuf", "count");
+ UInt64 "offset"; Int "status";
+ Mutable (Int "error")] });
Flags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
@@ -1542,12 +1542,12 @@ punching a hole.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure (false,
- [{ cbname="extent";
- cbargs=[String "metacontext";
- UInt64 "offset";
- ArrayAndLen (UInt32 "entries",
- "nr_entries");
- Mutable (Int "error")]} ]);
+ { cbname="extent";
+ cbargs=[String "metacontext";
+ UInt64 "offset";
+ ArrayAndLen (UInt32 "entries",
+ "nr_entries");
+ Mutable (Int "error")]} );
Flags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
@@ -1726,8 +1726,8 @@ C<nbd_pread>.";
default_call with
args = [ BytesPersistOut ("buf", "count"); UInt64 "offset";
Closure (true,
- [{ cbname="callback";
- cbargs=[Int64 "cookie"; Mutable (Int "error")] } ]);
+ { cbname="callback";
+ cbargs=[Int64 "cookie"; Mutable (Int "error")] } );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1756,11 +1756,11 @@ cause a deadlock.";
default_call with
args = [ BytesPersistOut ("buf", "count"); UInt64 "offset";
Closure (true,
- [{ cbname="chunk";
- cbargs=[BytesIn ("subbuf", "count");
- UInt64 "offset";
- Int "status";
- Mutable (Int "error");]} ]);
+ { cbname="chunk";
+ cbargs=[BytesIn ("subbuf", "count");
+ UInt64 "offset";
+ Int "status";
+ Mutable (Int "error");]} );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1778,14 +1778,15 @@ documented in C<nbd_pread_structured>.";
default_call with
args = [ BytesPersistOut ("buf", "count"); UInt64 "offset";
Closure (true,
- [{ cbname="chunk";
- cbargs=[BytesIn ("subbuf", "count");
- UInt64 "offset";
- Int "status";
- Mutable (Int "error"); ]};
- { cbname="callback";
- cbargs=[Int64 "cookie";
- Mutable (Int "error"); ]} ]);
+ { cbname="chunk";
+ cbargs=[BytesIn ("subbuf", "count");
+ UInt64 "offset";
+ Int "status";
+ Mutable (Int "error"); ]});
+ Closure (true,
+ { cbname="callback";
+ cbargs=[Int64 "cookie";
+ Mutable (Int "error"); ]} );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1829,8 +1830,8 @@ C<nbd_pwrite>.";
default_call with
args = [ BytesPersistIn ("buf", "count"); UInt64 "offset";
Closure (true,
- [{ cbname="callback";
- cbargs=[Int64 "cookie"; Mutable (Int "error")]} ]);
+ { cbname="callback";
+ cbargs=[Int64 "cookie"; Mutable (Int "error")]} );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1894,8 +1895,8 @@ Parameters behave as documented in C<nbd_flush>.";
"aio_flush_callback", {
default_call with
args = [ Closure (true,
- [{ cbname="callback";
- cbargs=[Int64 "cookie"; Mutable (Int "error")]} ]);
+ { cbname="callback";
+ cbargs=[Int64 "cookie"; Mutable (Int "error")]} );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1937,8 +1938,8 @@ Parameters behave as documented in C<nbd_trim>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure (true,
- [{ cbname="callback";
- cbargs=[Int64 "cookie"; Mutable (Int "error")]} ]);
+ { cbname="callback";
+ cbargs=[Int64 "cookie"; Mutable (Int "error")]} );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1980,8 +1981,8 @@ Parameters behave as documented in C<nbd_cache>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure (true,
- [{ cbname="callback";
- cbargs=[Int64 "cookie"; Mutable (Int "error")]} ]);
+ { cbname="callback";
+ cbargs=[Int64 "cookie"; Mutable (Int "error")]} );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -2023,8 +2024,8 @@ Parameters behave as documented in C<nbd_zero>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure (true,
- [{ cbname="callback";
- cbargs=[Int64 "cookie"; Mutable (Int "error")]} ]);
+ { cbname="callback";
+ cbargs=[Int64 "cookie"; Mutable (Int "error")]} );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -2052,11 +2053,11 @@ cause a deadlock.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure (true,
- [{ cbname="extent";
- cbargs=[String "metacontext"; UInt64 "offset";
- ArrayAndLen (UInt32 "entries",
- "nr_entries");
- Mutable (Int "error")] } ]);
+ { cbname="extent";
+ cbargs=[String "metacontext"; UInt64 "offset";
+ ArrayAndLen (UInt32 "entries",
+ "nr_entries");
+ Mutable (Int "error")] } );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -2073,13 +2074,14 @@ Parameters behave as documented in C<nbd_block_status>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure (true,
- [{ cbname="extent";
- cbargs=[String "metacontext"; UInt64 "offset";
- ArrayAndLen (UInt32 "entries",
- "nr_entries");
- Mutable (Int "error")]};
- { cbname="callback";
- cbargs=[Int64 "cookie"; Mutable (Int "error")]} ]);
+ { cbname="extent";
+ cbargs=[String "metacontext"; UInt64 "offset";
+ ArrayAndLen (UInt32 "entries",
+ "nr_entries");
+ Mutable (Int "error")]});
+ Closure (true,
+ { cbname="callback";
+ cbargs=[Int64 "cookie"; Mutable (Int "error")]} );
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -3137,20 +3139,6 @@ let () =
name
) handle_calls;
- (* Closure also must appear only once, but can be anywhere. *)
- List.iter (
- fun (name, { args }) ->
- let rec loop = function
- | [] -> ()
- | Closure _ :: xs ->
- if List.exists (function Closure _ -> true | _ -> false) xs then
- failwithf "%s: Closure must appear only once" name
- | x :: xs ->
- loop xs
- in
- loop args
- ) handle_calls;
-
(* !may_set_error is incompatible with permitted_states != [] because
* an incorrect state will result in set_error being called by the
* generated wrapper.
@@ -3186,8 +3174,7 @@ let rec name_of_arg = function
| BytesOut (n, len) -> [n; len]
| BytesPersistIn (n, len) -> [n; len]
| BytesPersistOut (n, len) -> [n; len]
-| Closure (_, closures) ->
- List.map (fun { cbname } -> cbname) closures @ ["user_data"]
+| Closure (_, { cbname }) -> [cbname; sprintf "%s_user_data" cbname ]
| Flags n -> [n]
| Int n -> [n]
| Int64 n -> [n]
@@ -3241,19 +3228,16 @@ let rec print_arg_list ?(handle = false) ?(user_data = false)
pr "%s, " n;
if types then pr "size_t ";
pr "%s" len
- | Closure (_, cls) ->
- List.iter (
- fun { cbname; cbargs } ->
- if types then (
- pr "int (*%s) " cbname;
- print_arg_list ~user_data:true cbargs;
- )
- else
- pr "%s" cbname;
- pr ", "
- ) cls;
+ | Closure (_, { cbname; cbargs }) ->
+ if types then (
+ pr "int (*%s) " cbname;
+ print_arg_list ~user_data:true cbargs;
+ )
+ else
+ pr "%s" cbname;
+ pr ", ";
if types then pr "void *";
- pr "user_data"
+ pr "%s_user_data" cbname
| Flags n ->
if types then pr "uint32_t ";
pr "%s" n
@@ -3811,154 +3795,140 @@ let print_python_binding name { args; ret } =
*)
List.iter (
function
- | Closure (persistent, cls) ->
- pr "struct %s_user_data {\n" name;
- List.iter (
- fun { cbname } ->
- pr " PyObject *%s;\n" cbname
- ) cls;
- pr "};\n";
- pr "\n";
-
+ | Closure (persistent, { cbname; cbargs }) ->
(* Persistent closures need an explicit function to decrement
* the closure refcounts and free the user_data struct.
*)
if persistent then (
pr "static void\n";
- pr "free_%s_user_data (void *vp)\n" name;
+ pr "free_%s_%s_user_data (void *vp)\n" name cbname;
pr "{\n";
- pr " struct %s_user_data *user_data = vp;\n" name;
+ pr " PyObject *user_data = vp;\n";
pr "\n";
- List.iter (
- fun { cbname } ->
- pr " Py_DECREF (user_data->%s);\n" cbname
- ) cls;
- pr " free (user_data);\n";
+ pr " Py_DECREF (user_data);\n";
pr "}\n";
pr "\n";
);
+ pr "/* Wrapper for %s callback of %s. */\n" cbname name;
+ pr "static int\n";
+ pr "%s_%s_wrapper " name cbname;
+ C.print_arg_list ~user_data:true cbargs;
+ pr "\n";
+ pr "{\n";
+ pr " int ret;\n";
+ pr " PyGILState_STATE py_save = PyGILState_UNLOCKED;\n";
+ pr " PyObject *py_args, *py_ret;\n";
List.iter (
- fun { cbname; cbargs } ->
- pr "static int\n";
- pr "%s_%s_wrapper " name cbname;
- C.print_arg_list ~user_data:true cbargs;
- pr "\n";
- pr "{\n";
- pr " int ret;\n";
- pr " PyGILState_STATE py_save = PyGILState_UNLOCKED;\n";
- pr " PyObject *py_args, *py_ret;\n";
- List.iter (
- function
- | ArrayAndLen (UInt32 n, len) ->
- pr " PyObject *py_%s = PyList_New (%s);\n" n len;
- pr " for (size_t i = 0; i < %s; ++i)\n" len;
- pr " PyList_SET_ITEM (py_%s, i, PyLong_FromUnsignedLong (%s[i]));\n" n n
- | BytesIn _
- | Int _
- | Int64 _ -> ()
- | Mutable (Int n) ->
- pr " PyObject *py_%s_modname = PyUnicode_FromString (\"ctypes\");\n" n;
- pr " if (!py_%s_modname) { PyErr_PrintEx (0); return -1; }\n" n;
- pr " PyObject *py_%s_mod = PyImport_Import (py_%s_modname);\n" n n;
- pr " Py_DECREF (py_%s_modname);\n" n;
- pr " if (!py_%s_mod) { PyErr_PrintEx (0); return -1; }\n" n;
- pr " PyObject *py_%s = PyObject_CallMethod (py_%s_mod, \"c_int\", \"i\", *%s);\n" n n n;
- pr " if (!py_%s) { PyErr_PrintEx (0); return -1; }\n" n;
- | String n
- | UInt64 n -> ()
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt _ | UInt32 _ -> assert false
- ) cbargs;
- pr "\n";
+ function
+ | ArrayAndLen (UInt32 n, len) ->
+ pr " PyObject *py_%s = PyList_New (%s);\n" n len;
+ pr " for (size_t i = 0; i < %s; ++i)\n" len;
+ pr " PyList_SET_ITEM (py_%s, i, PyLong_FromUnsignedLong (%s[i]));\n" n n
+ | BytesIn _
+ | Int _
+ | Int64 _ -> ()
+ | Mutable (Int n) ->
+ pr " PyObject *py_%s_modname = PyUnicode_FromString (\"ctypes\");\n" n;
+ pr " if (!py_%s_modname) { PyErr_PrintEx (0); return -1; }\n" n;
+ pr " PyObject *py_%s_mod = PyImport_Import (py_%s_modname);\n" n n;
+ pr " Py_DECREF (py_%s_modname);\n" n;
+ pr " if (!py_%s_mod) { PyErr_PrintEx (0); return -1; }\n" n;
+ pr " PyObject *py_%s = PyObject_CallMethod (py_%s_mod, \"c_int\", \"i\", *%s);\n" n n n;
+ pr " if (!py_%s) { PyErr_PrintEx (0); return -1; }\n" n;
+ | String n
+ | UInt64 n -> ()
+ (* The following not yet implemented for callbacks XXX *)
+ | ArrayAndLen _ | Bool _ | BytesOut _
+ | BytesPersistIn _ | BytesPersistOut _
+ | Closure _
+ | Flags _ | Mutable _
+ | Path _ | SockAddrAndLen _ | StringList _
+ | UInt _ | UInt32 _ -> assert false
+ ) cbargs;
+ pr "\n";
- pr " py_args = Py_BuildValue (\"(\"";
- List.iter (
- function
- | ArrayAndLen (UInt32 n, len) -> pr " \"O\""
- | BytesIn (n, len) -> pr " \"y#\""
- | Int n -> pr " \"i\""
- | Int64 n -> pr " \"L\""
- | Mutable (Int n) -> pr " \"O\""
- | String n -> pr " \"s\""
- | UInt64 n -> pr " \"K\""
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt _ | UInt32 _ -> assert false
- ) cbargs;
- pr " \")\"";
- List.iter (
- function
- | ArrayAndLen (UInt32 n, _) -> pr ", py_%s" n
- | BytesIn (n, len) -> pr ", %s, (int) %s" n len
- | Mutable (Int n) -> pr ", py_%s" n
- | Int n | Int64 n
- | String n
- | UInt64 n -> pr ", %s" n
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt _ | UInt32 _ -> assert false
- ) cbargs;
- pr ");\n";
- pr " Py_INCREF (py_args);\n";
- pr "\n";
- pr " if (PyEval_ThreadsInitialized ())\n";
- pr " py_save = PyGILState_Ensure ();\n";
- pr "\n";
- pr " py_ret = PyObject_CallObject (((struct %s_user_data *)user_data)->%s, py_args);\n" name cbname;
- pr "\n";
- pr " if (PyEval_ThreadsInitialized ())\n";
- pr " PyGILState_Release (py_save);\n";
- pr "\n";
- pr " Py_DECREF (py_args);\n";
- pr "\n";
- pr " if (py_ret != NULL) {\n";
- pr " ret = 0;\n";
- pr " Py_DECREF (py_ret); /* return value is discarded */\n";
- pr " }\n";
- pr " else {\n";
- pr " ret = -1;\n";
- pr " PyErr_PrintEx (0); /* print exception */\n";
- pr " };\n";
- pr "\n";
- List.iter (
- function
- | ArrayAndLen (UInt32 n, _) ->
- pr " Py_DECREF (py_%s);\n" n
- | Mutable (Int n) ->
- pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value\");\n" n n;
- pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n;
- pr " Py_DECREF (py_%s_ret);\n" n;
- pr " Py_DECREF (py_%s);\n" n
- | BytesIn _
- | Int _ | Int64 _
- | String _
- | UInt64 _ -> ()
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt _ | UInt32 _ -> assert false
- ) cbargs;
- pr " return ret;\n";
- pr "}\n";
- pr "\n"
- ) cls
+ pr " py_args = Py_BuildValue (\"(\"";
+ List.iter (
+ function
+ | ArrayAndLen (UInt32 n, len) -> pr " \"O\""
+ | BytesIn (n, len) -> pr " \"y#\""
+ | Int n -> pr " \"i\""
+ | Int64 n -> pr " \"L\""
+ | Mutable (Int n) -> pr " \"O\""
+ | String n -> pr " \"s\""
+ | UInt64 n -> pr " \"K\""
+ (* The following not yet implemented for callbacks XXX *)
+ | ArrayAndLen _ | Bool _ | BytesOut _
+ | BytesPersistIn _ | BytesPersistOut _
+ | Closure _
+ | Flags _ | Mutable _
+ | Path _ | SockAddrAndLen _ | StringList _
+ | UInt _ | UInt32 _ -> assert false
+ ) cbargs;
+ pr " \")\"";
+ List.iter (
+ function
+ | ArrayAndLen (UInt32 n, _) -> pr ", py_%s" n
+ | BytesIn (n, len) -> pr ", %s, (int) %s" n len
+ | Mutable (Int n) -> pr ", py_%s" n
+ | Int n | Int64 n
+ | String n
+ | UInt64 n -> pr ", %s" n
+ (* The following not yet implemented for callbacks XXX *)
+ | ArrayAndLen _ | Bool _ | BytesOut _
+ | BytesPersistIn _ | BytesPersistOut _
+ | Closure _
+ | Flags _ | Mutable _
+ | Path _ | SockAddrAndLen _ | StringList _
+ | UInt _ | UInt32 _ -> assert false
+ ) cbargs;
+ pr ");\n";
+ pr " Py_INCREF (py_args);\n";
+ pr "\n";
+ pr " if (PyEval_ThreadsInitialized ())\n";
+ pr " py_save = PyGILState_Ensure ();\n";
+ pr "\n";
+ pr " py_ret = PyObject_CallObject ((PyObject *)user_data, py_args);\n";
+ pr "\n";
+ pr " if (PyEval_ThreadsInitialized ())\n";
+ pr " PyGILState_Release (py_save);\n";
+ pr "\n";
+ pr " Py_DECREF (py_args);\n";
+ pr "\n";
+ pr " if (py_ret != NULL) {\n";
+ pr " ret = 0;\n";
+ pr " Py_DECREF (py_ret); /* return value is discarded */\n";
+ pr " }\n";
+ pr " else {\n";
+ pr " ret = -1;\n";
+ pr " PyErr_PrintEx (0); /* print exception */\n";
+ pr " };\n";
+ pr "\n";
+ List.iter (
+ function
+ | ArrayAndLen (UInt32 n, _) ->
+ pr " Py_DECREF (py_%s);\n" n
+ | Mutable (Int n) ->
+ pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value\");\n" n n;
+ pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n;
+ pr " Py_DECREF (py_%s_ret);\n" n;
+ pr " Py_DECREF (py_%s);\n" n
+ | BytesIn _
+ | Int _ | Int64 _
+ | String _
+ | UInt64 _ -> ()
+ (* The following not yet implemented for callbacks XXX *)
+ | ArrayAndLen _ | Bool _ | BytesOut _
+ | BytesPersistIn _ | BytesPersistOut _
+ | Closure _
+ | Flags _ | Mutable _
+ | Path _ | SockAddrAndLen _ | StringList _
+ | UInt _ | UInt32 _ -> assert false
+ ) cbargs;
+ pr " return ret;\n";
+ pr "}\n";
+ pr "\n"
| _ -> ()
) args;
@@ -3996,11 +3966,8 @@ let print_python_binding name { args; ret } =
pr " PyObject *%s; /* PyCapsule pointing to struct py_aio_buffer */\n"
n;
pr " struct py_aio_buffer *%s_buf;\n" n
- | Closure (false, cls) ->
- pr " struct %s_user_data _user_data;\n" name;
- pr " struct %s_user_data *user_data = &_user_data;\n" name
- | Closure (true, cls) ->
- pr " struct %s_user_data *user_data;\n" name
+ | Closure (_, { cbname }) ->
+ pr " PyObject *%s_user_data;\n" cbname
| Flags n ->
pr " uint32_t %s_u32;\n" n;
pr " unsigned int %s; /* really uint32_t */\n" n
@@ -4031,19 +3998,6 @@ let print_python_binding name { args; ret } =
) args;
pr "\n";
- (* Allocate the persistent closure user_data. *)
- List.iter (
- function
- | Closure (false, _) -> ()
- | Closure (true, cls) ->
- pr " user_data = malloc (sizeof *user_data);\n";
- pr " if (user_data == NULL) {\n";
- pr " PyErr_NoMemory ();\n";
- pr " return NULL;\n";
- pr " }\n"
- | _ -> ()
- ) args;
-
(* Parse the Python parameters. *)
pr " if (!PyArg_ParseTuple (args, (char *) \"O\"";
List.iter (
@@ -4054,7 +4008,7 @@ let print_python_binding name { args; ret } =
| BytesPersistIn (n, _) -> pr " \"O\""
| BytesOut (_, count) -> pr " \"n\""
| BytesPersistOut (_, count) -> pr " \"O\""
- | Closure (_, cls) -> List.iter (fun _ -> pr " \"O\"") cls
+ | Closure _ -> pr " \"O\""
| Flags n -> pr " \"I\""
| Int n -> pr " \"i\""
| Int64 n -> pr " \"L\""
@@ -4078,8 +4032,7 @@ let print_python_binding name { args; ret } =
| BytesIn (n, _) | BytesPersistIn (n, _)
| BytesPersistOut (n, _) -> pr ", &%s" n
| BytesOut (_, count) -> pr ", &%s" count
- | Closure (_, cls) ->
- List.iter (fun { cbname } -> pr ", &user_data->%s" cbname) cls
+ | Closure (_, { cbname }) -> pr ", &%s_user_data" cbname
| Flags n -> pr ", &%s" n
| Int n -> pr ", &%s" n
| Int64 n -> pr ", &%s" n
@@ -4101,11 +4054,8 @@ let print_python_binding name { args; ret } =
List.iter (
function
| Closure (false, _) -> ()
- | Closure (true, cls) ->
- List.iter (
- fun { cbname } ->
- pr " Py_INCREF (user_data->%s);\n" cbname
- ) cls
+ | Closure (true, { cbname }) ->
+ pr " Py_INCREF (%s_user_data);\n" cbname
| _ -> ()
) args;
@@ -4136,15 +4086,12 @@ let print_python_binding name { args; ret } =
pr " %s = malloc (%s);\n" n count
| BytesPersistIn (n, _) | BytesPersistOut (n, _) ->
pr " %s_buf = nbd_internal_py_get_aio_buffer (%s);\n" n n
- | Closure (_, cls) ->
- List.iter (
- fun { cbname } ->
- pr " if (!PyCallable_Check (user_data->%s)) {\n" cbname;
- pr " PyErr_SetString (PyExc_TypeError,\n";
- pr " \"callback parameter %s is not callable\");\n" cbname;
- pr " return NULL;\n";
- pr " }\n"
- ) cls
+ | Closure (_, { cbname }) ->
+ pr " if (!PyCallable_Check (%s_user_data)) {\n" cbname;
+ pr " PyErr_SetString (PyExc_TypeError,\n";
+ pr " \"callback parameter %s is not callable\");\n" cbname;
+ pr " return NULL;\n";
+ pr " }\n"
| Flags n -> pr " %s_u32 = %s;\n" n n
| Int _ -> ()
| Int64 n -> pr " %s_i64 = %s;\n" n n
@@ -4175,12 +4122,9 @@ let print_python_binding name { args; ret } =
| BytesOut (n, count) -> pr ", %s, %s" n count
| BytesPersistIn (n, _)
| BytesPersistOut (n, _) -> pr ", %s_buf->data, %s_buf->len" n n
- | Closure (_, cls) ->
- List.iter (
- fun { cbname } ->
- pr ", %s_%s_wrapper" name cbname
- ) cls;
- pr ", user_data"
+ | Closure (_, { cbname }) ->
+ pr ", %s_%s_wrapper" name cbname;
+ pr ", %s_user_data" cbname
| Flags n -> pr ", %s_u32" n
| Int n -> pr ", %s" n
| Int64 n -> pr ", %s_i64" n
@@ -4257,9 +4201,10 @@ let print_python_binding name { args; ret } =
| BytesIn (n, _) -> pr " PyBuffer_Release (&%s);\n" n
| BytesPersistIn _ | BytesOut _ | BytesPersistOut _ -> ()
| Closure (false, _) -> ()
- | Closure (true, _) ->
+ | Closure (true, { cbname }) ->
pr " /* This ensures the callback data is freed eventually. */\n";
- pr " nbd_add_close_callback (h, free_%s_user_data, user_data);\n" name
+ pr " nbd_add_close_callback (h, free_%s_%s_user_data, %s_user_data);\n"
+ name cbname cbname
| Flags _ -> ()
| Int _ -> ()
| Int64 _ -> ()
@@ -4406,8 +4351,7 @@ class NBD (object):
| BytesIn (n, _) | BytesPersistIn (n, _) -> [n, None]
| BytesPersistOut (n, _) -> [n, None]
| BytesOut (_, count) -> [count, None]
- | Closure (_, cls) ->
- List.map (fun { cbname } -> cbname, None) cls
+ | Closure (_, { cbname }) -> [cbname, None]
| Flags n -> [n, Some "0"]
| Int n -> [n, None]
| Int64 n -> [n, None]
@@ -4471,7 +4415,6 @@ end = struct
type ocaml_arg =
| OCamlHandle (* The NBD handle (NBD.t) *)
| OCamlFlags of string (* Optional ?flags parameter *)
- | OCamlClosure of bool * closure (* Single closure parameter *)
| OCamlArg of arg (* Other arg (string = name). *)
let args_to_ocaml_args args =
@@ -4483,8 +4426,6 @@ let args_to_ocaml_args args =
let args =
List.map (
function
- | Closure (persistent, cls) ->
- List.map (fun cl -> OCamlClosure (persistent, cl)) cls
| a -> [OCamlArg a]
) args in
let args = List.flatten args in
@@ -4502,10 +4443,6 @@ let rec ocaml_fundecl_to_string args ret =
and ocaml_arg_to_string = function
| OCamlHandle -> "t"
| OCamlFlags n -> sprintf "?%s:int32 list" n
- | OCamlClosure (_, { cbargs }) ->
- sprintf "(%s)"
- (ocaml_fundecl_to_string (List.map (fun a -> OCamlArg a) cbargs)
- RErr)
| OCamlArg (ArrayAndLen (t, _)) ->
sprintf "%s array" (ocaml_arg_to_string (OCamlArg t))
| OCamlArg (Bool _) -> "bool"
@@ -4513,7 +4450,10 @@ and ocaml_arg_to_string = function
| OCamlArg (BytesPersistIn _) -> "Buffer.t"
| OCamlArg (BytesOut _) -> "bytes"
| OCamlArg (BytesPersistOut _) -> "Buffer.t"
- | OCamlArg (Closure _) -> assert false (* see above *)
+ | OCamlArg (Closure (_, { cbargs })) ->
+ sprintf "(%s)"
+ (ocaml_fundecl_to_string (List.map (fun a -> OCamlArg a) cbargs)
+ RErr)
| OCamlArg (Flags _) -> assert false (* see above *)
| OCamlArg (Int _) -> "int"
| OCamlArg (Int64 _) -> "int64"
@@ -4538,7 +4478,6 @@ and ocaml_ret_to_string = function
let rec name_of_ocaml_arg = function
| OCamlHandle -> "h"
| OCamlFlags n -> n
- | OCamlClosure (_, { cbname }) -> cbname
| OCamlArg a ->
match a with
| ArrayAndLen (arg, n) -> name_of_ocaml_arg (OCamlArg arg)
@@ -4547,7 +4486,7 @@ let rec name_of_ocaml_arg = function
| BytesOut (n, len) -> n
| BytesPersistIn (n, len) -> n
| BytesPersistOut (n, len) -> n
- | Closure (_, closures) -> assert false
+ | Closure (_, { cbname }) -> cbname
| Flags n -> n
| Int n -> n
| Int64 n -> n
@@ -4705,42 +4644,31 @@ let print_ocaml_binding (name, { args; ret }) =
(* Functions with a callback parameter require special handling. *)
List.iter (
function
- | Closure (persistent, cls) ->
- pr "struct %s_user_data {\n" name;
- List.iter (fun { cbname } -> pr " value %s;\n" cbname) cls;
- pr "};\n";
- pr "\n";
-
+ | Closure (persistent, { cbname; cbargs }) ->
(* Persistent closures need an explicit function to remove
* the global root and free the user_data struct.
*)
if persistent then (
pr "static void\n";
- pr "free_%s_user_data (void *vp)\n" name;
+ pr "free_%s_%s_user_data (void *vp)\n" name cbname;
pr "{\n";
- pr " struct %s_user_data *user_data = vp;\n" name;
+ pr " value *user_data = vp;\n";
pr "\n";
- List.iter (
- fun { cbname } ->
- pr " caml_remove_generational_global_root (&user_data->%s);\n"
- cbname
- ) cls;
+ pr " caml_remove_generational_global_root (user_data);\n";
pr " free (user_data);\n";
pr "}\n";
pr "\n"
);
- List.iter (
- fun { cbname; cbargs } ->
- let argnames =
- List.map (
- function
- | ArrayAndLen (UInt32 n, _) | BytesIn (n, _)
+ let argnames =
+ List.map (
+ function
+ | ArrayAndLen (UInt32 n, _) | BytesIn (n, _)
| Int n | Int64 n
| Mutable (Int n) | String n | UInt64 n ->
- n ^ "v"
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
+ n ^ "v"
+ (* The following not yet implemented for callbacks XXX *)
+ | ArrayAndLen _ | Bool _ | BytesOut _
| BytesPersistIn _ | BytesPersistOut _
| Closure _
| Flags _ | Path _ | Mutable _
@@ -4748,105 +4676,105 @@ let print_ocaml_binding (name, { args; ret }) =
| UInt _ | UInt32 _ -> assert false
) cbargs in
- pr "static int\n";
- pr "%s_%s_wrapper_locked " name cbname;
- C.print_arg_list ~user_data:true cbargs;
- pr "\n";
- pr "{\n";
- pr " CAMLparam0 ();\n";
- assert (List.length argnames <= 5);
- pr " CAMLlocal%d (%s);\n" (List.length argnames)
- (String.concat ", " argnames);
- pr " CAMLlocal2 (fnv, rv);\n";
- pr " value args[%d];\n" (List.length argnames);
- pr "\n";
+ pr "/* Wrapper for %s callback of %s. */\n" cbname name;
+ pr "static int\n";
+ pr "%s_%s_wrapper_locked " name cbname;
+ C.print_arg_list ~user_data:true cbargs;
+ pr "\n";
+ pr "{\n";
+ pr " CAMLparam0 ();\n";
+ assert (List.length argnames <= 5);
+ pr " CAMLlocal%d (%s);\n" (List.length argnames)
+ (String.concat ", " argnames);
+ pr " CAMLlocal2 (fnv, rv);\n";
+ pr " value args[%d];\n" (List.length argnames);
+ pr "\n";
- List.iter (
- function
- | ArrayAndLen (UInt32 n, count) ->
- pr " %sv = nbd_internal_ocaml_alloc_int32_array (%s, %s);\n"
- n n count;
- | BytesIn (n, len) ->
- pr " %sv = caml_alloc_string (%s);\n" n len;
- pr " memcpy (String_val (%sv), %s, %s);\n" n n len
- | Int n ->
- pr " %sv = Val_int (%s);\n" n n
- | Int64 n ->
- pr " %sv = caml_copy_int64 (%s);\n" n n
- | String n ->
- pr " %sv = caml_copy_string (%s);\n" n n
- | UInt64 n ->
- pr " %sv = caml_copy_int64 (%s);\n" n n
- | Mutable (Int n) ->
- pr " %sv = caml_alloc_tuple (1);\n" n;
- pr " Store_field (%sv, 0, Val_int (*%s));\n" n n
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt _ | UInt32 _ -> assert false
- ) cbargs;
+ List.iter (
+ function
+ | ArrayAndLen (UInt32 n, count) ->
+ pr " %sv = nbd_internal_ocaml_alloc_int32_array (%s, %s);\n"
+ n n count;
+ | BytesIn (n, len) ->
+ pr " %sv = caml_alloc_string (%s);\n" n len;
+ pr " memcpy (String_val (%sv), %s, %s);\n" n n len
+ | Int n ->
+ pr " %sv = Val_int (%s);\n" n n
+ | Int64 n ->
+ pr " %sv = caml_copy_int64 (%s);\n" n n
+ | String n ->
+ pr " %sv = caml_copy_string (%s);\n" n n
+ | UInt64 n ->
+ pr " %sv = caml_copy_int64 (%s);\n" n n
+ | Mutable (Int n) ->
+ pr " %sv = caml_alloc_tuple (1);\n" n;
+ pr " Store_field (%sv, 0, Val_int (*%s));\n" n n
+ (* The following not yet implemented for callbacks XXX *)
+ | ArrayAndLen _ | Bool _ | BytesOut _
+ | BytesPersistIn _ | BytesPersistOut _
+ | Closure _
+ | Flags _ | Mutable _
+ | Path _ | SockAddrAndLen _ | StringList _
+ | UInt _ | UInt32 _ -> assert false
+ ) cbargs;
- List.iteri (fun i n -> pr " args[%d] = %s;\n" i n) argnames;
+ List.iteri (fun i n -> pr " args[%d] = %s;\n" i n) argnames;
- pr " fnv = ((struct %s_user_data *)user_data)->%s;\n" name cbname;
+ pr " fnv = * (value *) user_data;\n";
- pr " rv = caml_callbackN_exn (fnv, %d, args);\n"
- (List.length argnames);
+ pr " rv = caml_callbackN_exn (fnv, %d, args);\n"
+ (List.length argnames);
- List.iter (
- function
- | ArrayAndLen (UInt32 n, count) -> ()
- | BytesIn (n, len) -> ()
- | Int n -> ()
- | Int64 n -> ()
- | String n -> ()
- | UInt64 n -> ()
- | Mutable (Int n) ->
- pr " *%s = Int_val (Field (%sv, 0));\n" n n
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt _ | UInt32 _ -> assert false
- ) cbargs;
+ List.iter (
+ function
+ | ArrayAndLen (UInt32 n, count) -> ()
+ | BytesIn (n, len) -> ()
+ | Int n -> ()
+ | Int64 n -> ()
+ | String n -> ()
+ | UInt64 n -> ()
+ | Mutable (Int n) ->
+ pr " *%s = Int_val (Field (%sv, 0));\n" n n
+ (* The following not yet implemented for callbacks XXX *)
+ | ArrayAndLen _ | Bool _ | BytesOut _
+ | BytesPersistIn _ | BytesPersistOut _
+ | Closure _
+ | Flags _ | Mutable _
+ | Path _ | SockAddrAndLen _ | StringList _
+ | UInt _ | UInt32 _ -> assert false
+ ) cbargs;
- pr " if (Is_exception_result (rv)) {\n";
- pr " /* XXX This is not really an error as callbacks can return\n";
- pr " * an error indication. But perhaps we should direct this\n";
- pr " * to a more suitable place or formalize what exception\n";
- pr " * means error versus unexpected failure.\n";
- pr " */\n";
- pr " fprintf (stderr,\n";
- pr " \"libnbd: uncaught OCaml exception: %%s\\n\",\n";
- pr " caml_format_exception (Extract_exception (rv)));\n";
- pr " CAMLreturnT (int, -1);\n";
- pr " }\n";
+ pr " if (Is_exception_result (rv)) {\n";
+ pr " /* XXX This is not really an error as callbacks can return\n";
+ pr " * an error indication. But perhaps we should direct this\n";
+ pr " * to a more suitable place or formalize what exception\n";
+ pr " * means error versus unexpected failure.\n";
+ pr " */\n";
+ pr " fprintf (stderr,\n";
+ pr " \"libnbd: uncaught OCaml exception: %%s\\n\",\n";
+ pr " caml_format_exception (Extract_exception (rv)));\n";
+ pr " CAMLreturnT (int, -1);\n";
+ pr " }\n";
- pr "\n";
- pr " CAMLreturnT (int, 0);\n";
- pr "}\n";
- pr "\n";
- pr "static int\n";
- pr "%s_%s_wrapper " name cbname;
- C.print_arg_list ~user_data:true cbargs;
- pr "\n";
- pr "{\n";
- pr " int ret;\n";
- pr "\n";
- pr " caml_leave_blocking_section ();\n";
- pr " ret = %s_%s_wrapper_locked " name cbname;
- C.print_arg_list ~user_data:true ~types:false cbargs;
- pr ";\n";
- pr " caml_enter_blocking_section ();\n";
- pr " return ret;\n";
- pr "}\n";
- pr "\n"
- ) cls
+ pr "\n";
+ pr " CAMLreturnT (int, 0);\n";
+ pr "}\n";
+ pr "\n";
+ pr "static int\n";
+ pr "%s_%s_wrapper " name cbname;
+ C.print_arg_list ~user_data:true cbargs;
+ pr "\n";
+ pr "{\n";
+ pr " int ret;\n";
+ pr "\n";
+ pr " caml_leave_blocking_section ();\n";
+ pr " ret = %s_%s_wrapper_locked " name cbname;
+ C.print_arg_list ~user_data:true ~types:false cbargs;
+ pr ";\n";
+ pr " caml_enter_blocking_section ();\n";
+ pr " return ret;\n";
+ pr "}\n";
+ pr "\n"
| _ -> ()
) args;
@@ -4889,32 +4817,6 @@ let print_ocaml_binding (name, { args; ret }) =
pr " CAMLlocal1 (rv);\n";
pr "\n";
- (* Set up user_data for closures. *)
- let has_closures =
- try
- let cl = List.find (function Closure _ -> true | _ -> false) args in
- match cl with
- | Closure (b, _) -> Some b
- | _ -> assert false
- with
- Not_found -> None in
- (match has_closures with
- | None -> ()
- | Some false ->
- pr " /* This is safe because we only call this while this stack\n";
- pr " * frame is live.\n";
- pr " */\n";
- pr " struct %s_user_data _user_data;\n" name;
- pr " struct %s_user_data *user_data = &_user_data;\n" name
- | Some true ->
- pr " /* The function may save a reference to the closure, so we\n";
- pr " * must treat it as a possible GC root.\n";
- pr " */\n";
- pr " struct %s_user_data *user_data;\n" name;
- pr " user_data = malloc (sizeof *user_data);\n";
- pr " if (user_data == NULL) caml_raise_out_of_memory ();\n"
- );
-
List.iter (
function
| OCamlHandle ->
@@ -4927,14 +4829,6 @@ let print_ocaml_binding (name, { args; ret }) =
pr " %s = Flags_val (Field (%sv, 0));\n" n n;
pr " else /* None */\n";
pr " %s = 0;\n" n
- | OCamlClosure (false, { cbname }) ->
- pr " user_data->%s = %sv;\n" cbname cbname;
- pr " const void *%s = %s_%s_wrapper;\n" cbname name cbname
- | OCamlClosure (true, { cbname }) ->
- pr " user_data->%s = %sv;\n" cbname cbname;
- pr " caml_register_generational_global_root (&user_data->%s);\n"
- cbname;
- pr " const void *%s = %s_%s_wrapper;\n" cbname name cbname
| OCamlArg (ArrayAndLen (t, _)) -> (* XXX *) ()
| OCamlArg (Bool n) ->
pr " bool %s = Bool_val (%sv);\n" n n
@@ -4952,7 +4846,26 @@ let print_ocaml_binding (name, { args; ret }) =
pr " struct nbd_buffer %s_buf = NBD_buffer_val (%sv);\n" n n;
pr " void *%s = %s_buf.data;\n" n n;
pr " size_t %s = %s_buf.len;\n" count n
- | OCamlArg (Closure _) -> assert false (* see above *)
+ | OCamlArg (Closure (false, { cbname })) ->
+ pr " /* This is safe because we only call this while this stack\n";
+ pr " * frame is live.\n";
+ pr " */\n";
+ pr " CAMLlocal1 (_%s_user_data);\n" cbname;
+ pr " value *%s_user_data = &_%s_user_data;\n" cbname cbname;
+ pr " _%s_user_data = %sv;\n" cbname cbname;
+ pr " const void *%s = %s_%s_wrapper;\n" cbname name cbname
+ | OCamlArg (Closure (true, { cbname })) ->
+ pr " /* The function may save a reference to the closure, so we\n";
+ pr " * must treat it as a possible GC root.\n";
+ pr " */\n";
+ pr " value *%s_user_data;\n" cbname;
+ pr " %s_user_data = malloc (sizeof (value));\n" cbname;
+ pr " if (%s_user_data == NULL) caml_raise_out_of_memory ();\n" cbname;
+ pr " caml_register_generational_global_root (%s_user_data);\n" cbname;
+ pr " *%s_user_data = %sv;\n" cbname cbname;
+ pr " const void *%s = %s_%s_wrapper;\n" cbname name cbname;
+ pr " nbd_add_close_callback (h, free_%s_%s_user_data, %s_user_data);\n"
+ name cbname cbname
| OCamlArg (Flags _) -> assert false (* see above *)
| OCamlArg (Int n) ->
pr " int %s = Int_val (%sv);\n" n n
@@ -4975,12 +4888,6 @@ let print_ocaml_binding (name, { args; ret }) =
pr " uint64_t %s = Int64_val (%sv);\n" n n
) oargs;
- (match has_closures with
- | None | Some false -> ()
- | Some true ->
- pr " nbd_add_close_callback (h, free_%s_user_data, user_data);\n" name
- );
-
let errcode =
match ret with
| RBool | RErr | RFd | RInt | RInt64 -> pr " int r;\n"; "-1"
@@ -5014,7 +4921,6 @@ let print_ocaml_binding (name, { args; ret }) =
| OCamlArg (StringList n) -> pr " free (%s);\n" n
| OCamlHandle
| OCamlFlags _
- | OCamlClosure _
| OCamlArg (ArrayAndLen _)
| OCamlArg (Bool _)
| OCamlArg (BytesIn _)
diff --git a/generator/states-reply-simple.c b/generator/states-reply-simple.c
index f1770fc..94875aa 100644
--- a/generator/states-reply-simple.c
+++ b/generator/states-reply-simple.c
@@ -64,7 +64,7 @@
int error = 0;
assert (cmd->error == 0);
- if (cmd->cb.fn.read (cmd->cb.user_data, cmd->data, cmd->count,
+ if (cmd->cb.fn.read (cmd->cb.fn_user_data, cmd->data, cmd->count,
cmd->offset, LIBNBD_READ_DATA, &error) == -1)
cmd->error = error ? error : EPROTO;
}
diff --git a/generator/states-reply-structured.c b/generator/states-reply-structured.c
index 25987ed..f60232e 100644
--- a/generator/states-reply-structured.c
+++ b/generator/states-reply-structured.c
@@ -298,7 +298,7 @@
* current error rather than any earlier one. If the callback fails
* without setting errno, then use the server's error below.
*/
- if (cmd->cb.fn.read (cmd->cb.user_data,
+ if (cmd->cb.fn.read (cmd->cb.fn_user_data,
cmd->data + (offset - cmd->offset),
0, offset, LIBNBD_READ_ERROR, &scratch) == -1)
if (cmd->error == 0)
@@ -385,7 +385,7 @@
if (cmd->cb.fn.read) {
int error = cmd->error;
- if (cmd->cb.fn.read (cmd->cb.user_data,
+ if (cmd->cb.fn.read (cmd->cb.fn_user_data,
cmd->data + (offset - cmd->offset),
length - sizeof offset, offset,
LIBNBD_READ_DATA, &error) == -1)
@@ -447,7 +447,7 @@
if (cmd->cb.fn.read) {
int error = cmd->error;
- if (cmd->cb.fn.read (cmd->cb.user_data,
+ if (cmd->cb.fn.read (cmd->cb.fn_user_data,
cmd->data + offset, length,
cmd->offset + offset,
LIBNBD_READ_HOLE, &error) == -1)
@@ -499,7 +499,7 @@
/* Call the caller's extent function. */
int error = cmd->error;
- if (cmd->cb.fn.extent (cmd->cb.user_data,
+ if (cmd->cb.fn.extent (cmd->cb.fn_user_data,
meta_context->name, cmd->offset,
&h->bs_entries[1], (length-4) / 4, &error) == -1)
if (cmd->error == 0)
diff --git a/lib/internal.h b/lib/internal.h
index 3f2d3f8..b2a65bc 100644
--- a/lib/internal.h
+++ b/lib/internal.h
@@ -269,8 +269,9 @@ struct command_cb {
extent_fn extent;
read_fn read;
} fn;
+ void *fn_user_data; /* associated with one of the fn callbacks above */
callback_fn callback;
- void *user_data;
+ void *user_data; /* associated with the callback function */
};
struct command {
diff --git a/lib/rw.c b/lib/rw.c
index 680b81a..7999a86 100644
--- a/lib/rw.c
+++ b/lib/rw.c
@@ -280,18 +280,24 @@ nbd_unlocked_aio_pread_structured (struct nbd_handle *h, void *buf,
uint32_t flags)
{
return nbd_unlocked_aio_pread_structured_callback (h, buf, count, offset,
- read, NULL, user_data,
+ read, user_data,
+ NULL, NULL,
flags);
}
int64_t
nbd_unlocked_aio_pread_structured_callback (struct nbd_handle *h, void *buf,
size_t count, uint64_t offset,
- read_fn read, callback_fn callback,
- void *user_data, uint32_t flags)
+ read_fn read,
+ void *read_user_data,
+ callback_fn callback,
+ void *callback_user_data,
+ uint32_t flags)
{
- struct command_cb cb = { .fn.read = read, .callback = callback,
- .user_data = user_data, };
+ struct command_cb cb = { .fn.read = read,
+ .fn_user_data = read_user_data,
+ .callback = callback,
+ .user_data = callback_user_data, };
if ((flags & ~LIBNBD_CMD_FLAG_DF) != 0) {
set_error (EINVAL, "invalid flag: %" PRIu32, flags);
@@ -493,18 +499,24 @@ nbd_unlocked_aio_block_status (struct nbd_handle *h,
uint32_t flags)
{
return nbd_unlocked_aio_block_status_callback (h, count, offset,
- extent, NULL, user_data,
+ extent, user_data,
+ NULL, NULL,
flags);
}
int64_t
nbd_unlocked_aio_block_status_callback (struct nbd_handle *h,
uint64_t count, uint64_t offset,
- extent_fn extent, callback_fn callback,
- void *user_data, uint32_t flags)
+ extent_fn extent,
+ void *extent_user_data,
+ callback_fn callback,
+ void *callback_user_data,
+ uint32_t flags)
{
- struct command_cb cb = { .fn.extent = extent, .callback = callback,
- .user_data = user_data, };
+ struct command_cb cb = { .fn.extent = extent,
+ .fn_user_data = extent_user_data,
+ .callback = callback,
+ .user_data = callback_user_data };
if (!h->structured_replies) {
set_error (ENOTSUP, "server does not support structured replies");
--
2.22.0
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