/usr/include/glusterfs/stack.h is in glusterfs-common 3.4.2-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 | /*
Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
/*
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 <sys/time.h>
#include "xlator.h"
#include "dict.h"
#include "list.h"
#include "common-utils.h"
#include "globals.h"
#include "lkowner.h"
#define NFS_PID 1
#define LOW_PRIO_PROC_PID -1
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 mem_pool *frame_mem_pool;
struct mem_pool *stack_mem_pool;
};
struct _call_frame_t {
call_stack_t *root; /* stack root */
call_frame_t *parent; /* previous BP */
call_frame_t *next;
call_frame_t *prev; /* maintenance 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 */
gf_boolean_t complete;
glusterfs_fop_t op;
struct timeval begin; /* when this frame was created */
struct timeval end; /* when this frame completed */
const char *wind_from;
const char *wind_to;
const char *unwind_from;
const char *unwind_to;
};
#define SMALL_GROUP_COUNT 128
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;
gf_lock_t stack_lock;
void *trans;
uint64_t unique;
void *state; /* pointer to request state */
uid_t uid;
gid_t gid;
pid_t pid;
uint16_t ngrps;
uint32_t groups_small[SMALL_GROUP_COUNT];
uint32_t *groups_large;
uint32_t *groups;
gf_lkowner_t lk_owner;
glusterfs_ctx_t *ctx;
call_frame_t frames;
int32_t op;
int8_t type;
struct timeval tv;
};
#define frame_set_uid_gid(frm, u, g) \
do { \
if (frm) { \
(frm)->root->uid = u; \
(frm)->root->gid = g; \
(frm)->root->ngrps = 0; \
} \
} while (0); \
struct xlator_fops;
void
gf_latency_begin (call_frame_t *frame, void *fn);
void
gf_latency_end (call_frame_t *frame);
static inline void
FRAME_DESTROY (call_frame_t *frame)
{
void *local = NULL;
if (frame->next)
frame->next->prev = frame->prev;
if (frame->prev)
frame->prev->next = frame->next;
if (frame->local) {
local = frame->local;
frame->local = NULL;
}
LOCK_DESTROY (&frame->lock);
mem_put (frame);
if (local)
mem_put (local);
}
static inline void
STACK_DESTROY (call_stack_t *stack)
{
void *local = NULL;
LOCK (&stack->pool->lock);
{
list_del_init (&stack->all_frames);
stack->pool->cnt--;
}
UNLOCK (&stack->pool->lock);
if (stack->frames.local) {
local = stack->frames.local;
stack->frames.local = NULL;
}
LOCK_DESTROY (&stack->frames.lock);
LOCK_DESTROY (&stack->stack_lock);
while (stack->frames.next) {
FRAME_DESTROY (stack->frames.next);
}
GF_FREE (stack->groups_large);
mem_put (stack);
if (local)
mem_put (local);
}
static inline void
STACK_RESET (call_stack_t *stack)
{
void *local = NULL;
if (stack->frames.local) {
local = stack->frames.local;
stack->frames.local = NULL;
}
while (stack->frames.next) {
FRAME_DESTROY (stack->frames.next);
}
if (local)
mem_put (local);
}
#define cbk(x) cbk_##x
#define FRAME_SU_DO(frm, local_type) \
do { \
local_type *__local = (frm)->local; \
__local->uid = frm->root->uid; \
__local->gid = frm->root->gid; \
frm->root->uid = 0; \
frm->root->gid = 0; \
} while (0); \
#define FRAME_SU_UNDO(frm, local_type) \
do { \
local_type *__local = (frm)->local; \
frm->root->uid = __local->uid; \
frm->root->gid = __local->gid; \
} while (0); \
/* make a call */
#define STACK_WIND(frame, rfn, obj, fn, params ...) \
do { \
call_frame_t *_new = NULL; \
xlator_t *old_THIS = NULL; \
\
_new = mem_get0 (frame->root->pool->frame_mem_pool); \
if (!_new) { \
gf_log ("stack", GF_LOG_ERROR, "alloc failed"); \
break; \
} \
typeof(fn##_cbk) tmp_cbk = rfn; \
_new->root = frame->root; \
_new->this = obj; \
_new->ret = (ret_fn_t) tmp_cbk; \
_new->parent = frame; \
_new->cookie = _new; \
_new->wind_from = __FUNCTION__; \
_new->wind_to = #fn; \
_new->unwind_to = #rfn; \
\
LOCK_INIT (&_new->lock); \
LOCK(&frame->root->stack_lock); \
{ \
_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; \
frame->ref_count++; \
} \
UNLOCK(&frame->root->stack_lock); \
old_THIS = THIS; \
THIS = obj; \
if (frame->this->ctx->measure_latency) \
gf_latency_begin (_new, fn); \
fn (_new, obj, params); \
THIS = old_THIS; \
} while (0)
/* make a call without switching frames */
#define STACK_WIND_TAIL(frame, obj, fn, params ...) \
do { \
xlator_t *old_THIS = NULL; \
\
frame->this = obj; \
frame->wind_to = #fn; \
old_THIS = THIS; \
THIS = obj; \
fn (frame, 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 = mem_get0 (frame->root->pool->frame_mem_pool); \
if (!_new) { \
gf_log ("stack", GF_LOG_ERROR, "alloc failed"); \
break; \
} \
typeof(fn##_cbk) tmp_cbk = rfn; \
_new->root = frame->root; \
_new->this = obj; \
_new->ret = (ret_fn_t) tmp_cbk; \
_new->parent = frame; \
_new->cookie = cky; \
_new->wind_from = __FUNCTION__; \
_new->wind_to = #fn; \
_new->unwind_to = #rfn; \
LOCK_INIT (&_new->lock); \
LOCK(&frame->root->stack_lock); \
{ \
frame->ref_count++; \
_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; \
} \
UNLOCK(&frame->root->stack_lock); \
fn##_cbk = rfn; \
old_THIS = THIS; \
THIS = obj; \
if (obj->ctx->measure_latency) \
gf_latency_begin (_new, fn); \
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; \
if (!frame) { \
gf_log ("stack", GF_LOG_CRITICAL, "!frame"); \
break; \
} \
fn = frame->ret; \
_parent = frame->parent; \
LOCK(&frame->root->stack_lock); \
{ \
_parent->ref_count--; \
} \
UNLOCK(&frame->root->stack_lock); \
old_THIS = THIS; \
THIS = _parent->this; \
frame->complete = _gf_true; \
frame->unwind_from = __FUNCTION__; \
if (frame->this->ctx->measure_latency) \
gf_latency_end (frame); \
fn (_parent, frame->cookie, _parent->this, params); \
THIS = old_THIS; \
} while (0)
/* return from function in type-safe way */
#define STACK_UNWIND_STRICT(op, frame, params ...) \
do { \
fop_##op##_cbk_t fn = NULL; \
call_frame_t *_parent = NULL; \
xlator_t *old_THIS = NULL; \
\
if (!frame) { \
gf_log ("stack", GF_LOG_CRITICAL, "!frame"); \
break; \
} \
fn = (fop_##op##_cbk_t )frame->ret; \
_parent = frame->parent; \
LOCK(&frame->root->stack_lock); \
{ \
_parent->ref_count--; \
} \
UNLOCK(&frame->root->stack_lock); \
old_THIS = THIS; \
THIS = _parent->this; \
frame->complete = _gf_true; \
frame->unwind_from = __FUNCTION__; \
if (frame->this->ctx->measure_latency) \
gf_latency_end (frame); \
fn (_parent, frame->cookie, _parent->this, params); \
THIS = old_THIS; \
} while (0)
static inline int
call_stack_alloc_groups (call_stack_t *stack, int ngrps)
{
if (ngrps <= SMALL_GROUP_COUNT) {
stack->groups = stack->groups_small;
} else {
stack->groups_large = GF_CALLOC (sizeof (gid_t), ngrps,
gf_common_mt_groups_t);
if (!stack->groups_large)
return -1;
stack->groups = stack->groups_large;
}
stack->ngrps = ngrps;
return 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 = mem_get0 (frame->root->pool->stack_mem_pool);
if (newstack == NULL) {
return NULL;
}
oldstack = frame->root;
newstack->uid = oldstack->uid;
newstack->gid = oldstack->gid;
newstack->pid = oldstack->pid;
newstack->ngrps = oldstack->ngrps;
newstack->op = oldstack->op;
newstack->type = oldstack->type;
if (call_stack_alloc_groups (newstack, oldstack->ngrps) != 0) {
mem_put (newstack);
return NULL;
}
memcpy (newstack->groups, oldstack->groups,
sizeof (gid_t) * oldstack->ngrps);
newstack->unique = oldstack->unique;
newstack->frames.this = frame->this;
newstack->frames.root = newstack;
newstack->pool = oldstack->pool;
newstack->lk_owner = oldstack->lk_owner;
newstack->ctx = oldstack->ctx;
if (newstack->ctx->measure_latency) {
if (gettimeofday (&newstack->tv, NULL) == -1)
gf_log ("stack", GF_LOG_ERROR, "gettimeofday () failed."
" (%s)", strerror (errno));
memcpy (&newstack->frames.begin, &newstack->tv,
sizeof (newstack->tv));
}
LOCK_INIT (&newstack->frames.lock);
LOCK_INIT (&newstack->stack_lock);
LOCK (&oldstack->pool->lock);
{
list_add (&newstack->all_frames, &oldstack->all_frames);
newstack->pool->cnt++;
}
UNLOCK (&oldstack->pool->lock);
return &newstack->frames;
}
void gf_proc_dump_pending_frames(call_pool_t *call_pool);
void gf_proc_dump_pending_frames_to_dict (call_pool_t *call_pool,
dict_t *dict);
call_frame_t *create_frame (xlator_t *xl, call_pool_t *pool);
gf_boolean_t __is_fuse_call (call_frame_t *frame);
#endif /* _STACK_H */
|