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/*
Copyright (c) 2006-2009 Z RESEARCH, Inc. <http://www.zresearch.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
/*
This file defines MACROS and static inlines used to emulate a function
call over asynchronous communication with remote server
*/
#ifndef _STACK_H
#define _STACK_H
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
struct _call_stack_t;
typedef struct _call_stack_t call_stack_t;
struct _call_frame_t;
typedef struct _call_frame_t call_frame_t;
struct _call_pool_t;
typedef struct _call_pool_t call_pool_t;
#include "xlator.h"
#include "dict.h"
#include "list.h"
#include "common-utils.h"
#include "globals.h"
typedef int32_t (*ret_fn_t) (call_frame_t *frame,
call_frame_t *prev_frame,
xlator_t *this,
int32_t op_ret,
int32_t op_errno,
...);
struct _call_pool_t {
union {
struct list_head all_frames;
struct {
call_stack_t *next_call;
call_stack_t *prev_call;
} all_stacks;
};
int64_t cnt;
gf_lock_t lock;
};
struct _call_frame_t {
call_stack_t *root; /* stack root */
call_frame_t *parent; /* previous BP */
call_frame_t *next;
call_frame_t *prev; /* maintainence list */
void *local; /* local variables */
xlator_t *this; /* implicit object */
ret_fn_t ret; /* op_return address */
int32_t ref_count;
gf_lock_t lock;
void *cookie; /* unique cookie */
};
struct _call_stack_t {
union {
struct list_head all_frames;
struct {
call_stack_t *next_call;
call_stack_t *prev_call;
};
};
call_pool_t *pool;
void *trans;
uint64_t unique;
void *state; /* pointer to request state */
uid_t uid;
gid_t gid;
pid_t pid;
call_frame_t frames;
int32_t op;
int8_t type;
};
static inline void
FRAME_DESTROY (call_frame_t *frame)
{
if (frame->next)
frame->next->prev = frame->prev;
if (frame->prev)
frame->prev->next = frame->next;
if (frame->local)
FREE (frame->local);
LOCK_DESTROY (&frame->lock);
FREE (frame);
}
static inline void
STACK_DESTROY (call_stack_t *stack)
{
LOCK (&stack->pool->lock);
{
list_del_init (&stack->all_frames);
stack->pool->cnt--;
}
UNLOCK (&stack->pool->lock);
if (stack->frames.local)
FREE (stack->frames.local);
LOCK_DESTROY (&stack->frames.lock);
while (stack->frames.next) {
FRAME_DESTROY (stack->frames.next);
}
FREE (stack);
}
#define cbk(x) cbk_##x
/* make a call */
#define STACK_WIND(frame, rfn, obj, fn, params ...) \
do { \
call_frame_t *_new = NULL; \
xlator_t *old_THIS = NULL; \
\
_new = CALLOC (1, sizeof (call_frame_t)); \
ERR_ABORT (_new); \
typeof(fn##_cbk) tmp_cbk = rfn; \
_new->root = frame->root; \
_new->next = frame->root->frames.next; \
_new->prev = &frame->root->frames; \
if (frame->root->frames.next) \
frame->root->frames.next->prev = _new; \
frame->root->frames.next = _new; \
_new->this = obj; \
_new->ret = (ret_fn_t) tmp_cbk; \
_new->parent = frame; \
_new->cookie = _new; \
LOCK_INIT (&_new->lock); \
frame->ref_count++; \
\
old_THIS = THIS; \
THIS = obj; \
fn (_new, obj, params); \
THIS = old_THIS; \
} while (0)
/* make a call with a cookie */
#define STACK_WIND_COOKIE(frame, rfn, cky, obj, fn, params ...) \
do { \
call_frame_t *_new = NULL; \
xlator_t *old_THIS = NULL; \
\
_new = CALLOC (1, sizeof (call_frame_t)); \
ERR_ABORT (_new); \
typeof(fn##_cbk) tmp_cbk = rfn; \
_new->root = frame->root; \
_new->next = frame->root->frames.next; \
_new->prev = &frame->root->frames; \
if (frame->root->frames.next) \
frame->root->frames.next->prev = _new; \
frame->root->frames.next = _new; \
_new->this = obj; \
_new->ret = (ret_fn_t) tmp_cbk; \
_new->parent = frame; \
_new->cookie = cky; \
LOCK_INIT (&_new->lock); \
frame->ref_count++; \
fn##_cbk = rfn; \
\
old_THIS = THIS; \
THIS = obj; \
fn (_new, obj, params); \
THIS = old_THIS; \
} while (0)
/* return from function */
#define STACK_UNWIND(frame, params ...) \
do { \
ret_fn_t fn = NULL; \
call_frame_t *_parent = NULL; \
xlator_t *old_THIS = NULL; \
\
fn = frame->ret; \
_parent = frame->parent; \
_parent->ref_count--; \
old_THIS = THIS; \
THIS = _parent->this; \
fn (_parent, frame->cookie, _parent->this, params); \
THIS = old_THIS; \
} while (0)
static inline call_frame_t *
copy_frame (call_frame_t *frame)
{
call_stack_t *newstack = NULL;
call_stack_t *oldstack = NULL;
if (!frame) {
return NULL;
}
newstack = (void *) CALLOC (1, sizeof (*newstack));
if (newstack == NULL) {
return NULL;
}
oldstack = frame->root;
newstack->uid = oldstack->uid;
newstack->gid = oldstack->gid;
newstack->pid = oldstack->pid;
newstack->unique = oldstack->unique;
newstack->frames.this = frame->this;
newstack->frames.root = newstack;
newstack->pool = oldstack->pool;
LOCK_INIT (&newstack->frames.lock);
LOCK (&oldstack->pool->lock);
{
list_add (&newstack->all_frames, &oldstack->all_frames);
newstack->pool->cnt++;
}
UNLOCK (&oldstack->pool->lock);
return &newstack->frames;
}
static inline call_frame_t *
create_frame (xlator_t *xl, call_pool_t *pool)
{
call_stack_t *stack = NULL;
if (!xl || !pool) {
return NULL;
}
stack = CALLOC (1, sizeof (*stack));
if (!stack)
return NULL;
stack->pool = pool;
stack->frames.root = stack;
stack->frames.this = xl;
LOCK (&pool->lock);
{
list_add (&stack->all_frames, &pool->all_frames);
pool->cnt++;
}
UNLOCK (&pool->lock);
LOCK_INIT (&stack->frames.lock);
return &stack->frames;
}
#endif /* _STACK_H */
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