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/*
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.
*/
#ifndef _SYNCOP_H
#define _SYNCOP_H
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "xlator.h"
#include <sys/time.h>
#include <pthread.h>
#include <ucontext.h>
#define SYNCENV_PROC_MAX 16
#define SYNCENV_PROC_MIN 2
#define SYNCPROC_IDLE_TIME 600
struct synctask;
struct syncproc;
struct syncenv;
typedef int (*synctask_cbk_t) (int ret, call_frame_t *frame, void *opaque);
typedef int (*synctask_fn_t) (void *opaque);
typedef enum {
SYNCTASK_INIT = 0,
SYNCTASK_RUN,
SYNCTASK_SUSPEND,
SYNCTASK_WAIT,
SYNCTASK_DONE,
} synctask_state_t;
/* for one sequential execution of @syncfn */
struct synctask {
struct list_head all_tasks;
struct syncenv *env;
xlator_t *xl;
call_frame_t *frame;
call_frame_t *opframe;
synctask_cbk_t synccbk;
synctask_fn_t syncfn;
synctask_state_t state;
void *opaque;
void *stack;
int woken;
int slept;
int ret;
uid_t uid;
gid_t gid;
ucontext_t ctx;
struct syncproc *proc;
pthread_mutex_t mutex; /* for synchronous spawning of synctask */
pthread_cond_t cond;
int done;
struct list_head waitq; /* can wait only "once" at a time */
};
struct syncproc {
pthread_t processor;
ucontext_t sched;
struct syncenv *env;
struct synctask *current;
};
/* hosts the scheduler thread and framework for executing synctasks */
struct syncenv {
struct syncproc proc[SYNCENV_PROC_MAX];
int procs;
struct list_head runq;
int runcount;
struct list_head waitq;
int waitcount;
pthread_mutex_t mutex;
pthread_cond_t cond;
size_t stacksize;
};
struct synclock {
pthread_mutex_t guard; /* guard the remaining members, pair @cond */
pthread_cond_t cond; /* waiting non-synctasks */
struct list_head waitq; /* waiting synctasks */
gf_boolean_t lock; /* _gf_true or _gf_false, lock status */
struct synctask *owner; /* NULL if current owner is not a synctask */
};
typedef struct synclock synclock_t;
struct syncbarrier {
pthread_mutex_t guard; /* guard the remaining members, pair @cond */
pthread_cond_t cond; /* waiting non-synctasks */
struct list_head waitq; /* waiting synctasks */
int count; /* count the number of wakes */
};
typedef struct syncbarrier syncbarrier_t;
struct syncargs {
int op_ret;
int op_errno;
struct iatt iatt1;
struct iatt iatt2;
dict_t *xattr;
gf_dirent_t entries;
struct statvfs statvfs_buf;
struct iovec *vector;
int count;
struct iobref *iobref;
char *buffer;
dict_t *xdata;
struct gf_flock flock;
/* some more _cbk needs */
uuid_t uuid;
char *errstr;
dict_t *dict;
pthread_mutex_t lock_dict;
syncbarrier_t barrier;
/* do not touch */
struct synctask *task;
pthread_mutex_t mutex;
pthread_cond_t cond;
int done;
};
#define __yawn(args) do { \
args->task = synctask_get (); \
if (args->task) \
break; \
pthread_mutex_init (&args->mutex, NULL); \
pthread_cond_init (&args->cond, NULL); \
args->done = 0; \
} while (0)
#define __wake(args) do { \
if (args->task) { \
synctask_wake (args->task); \
} else { \
pthread_mutex_lock (&args->mutex); \
{ \
args->done = 1; \
pthread_cond_signal (&args->cond); \
} \
pthread_mutex_unlock (&args->mutex); \
} \
} while (0)
#define __yield(args) do { \
if (args->task) { \
synctask_yield (args->task); \
} else { \
pthread_mutex_lock (&args->mutex); \
{ \
while (!args->done) \
pthread_cond_wait (&args->cond, \
&args->mutex); \
} \
pthread_mutex_unlock (&args->mutex); \
pthread_mutex_destroy (&args->mutex); \
pthread_cond_destroy (&args->cond); \
} \
} while (0)
#define SYNCOP(subvol, stb, cbk, op, params ...) do { \
struct synctask *task = NULL; \
call_frame_t *frame = NULL; \
\
task = synctask_get (); \
stb->task = task; \
if (task) \
frame = task->opframe; \
else \
frame = syncop_create_frame (THIS); \
\
if (task) { \
frame->root->uid = task->uid; \
frame->root->gid = task->gid; \
} \
\
__yawn (stb); \
\
STACK_WIND_COOKIE (frame, cbk, (void *)stb, subvol, \
op, params); \
\
__yield (stb); \
if (task) \
STACK_RESET (frame->root); \
else \
STACK_DESTROY (frame->root); \
} while (0)
#define SYNCENV_DEFAULT_STACKSIZE (2 * 1024 * 1024)
struct syncenv * syncenv_new ();
void syncenv_destroy (struct syncenv *);
void syncenv_scale (struct syncenv *env);
int synctask_new (struct syncenv *, synctask_fn_t, synctask_cbk_t, call_frame_t* frame, void *);
void synctask_wake (struct synctask *task);
void synctask_yield (struct synctask *task);
void synctask_waitfor (struct synctask *task, int count);
#define synctask_barrier_init(args) syncbarrier_init (&args->barrier)
#define synctask_barrier_wait(args, n) syncbarrier_wait (&args->barrier, n)
#define synctask_barrier_wake(args) syncbarrier_wake (&args->barrier)
int synctask_setid (struct synctask *task, uid_t uid, gid_t gid);
#define SYNCTASK_SETID(uid, gid) synctask_setid (synctask_get(), uid, gid);
static inline call_frame_t *
syncop_create_frame (xlator_t *this)
{
call_frame_t *frame = NULL;
frame = create_frame (this, this->ctx->pool);
if (!frame)
return NULL;
frame->root->pid = getpid();
frame->root->uid = geteuid ();
frame->root->gid = getegid ();
frame->root->ngrps = getgroups (GF_MAX_AUX_GROUPS, frame->root->groups);
return frame;
}
int synclock_init (synclock_t *lock);
int synclock_destory (synclock_t *lock);
int synclock_lock (synclock_t *lock);
int synclock_trylock (synclock_t *lock);
int synclock_unlock (synclock_t *lock);
int syncbarrier_init (syncbarrier_t *barrier);
int syncbarrier_wait (syncbarrier_t *barrier, int waitfor);
int syncbarrier_wake (syncbarrier_t *barrier);
int syncbarrier_destroy (syncbarrier_t *barrier);
int syncop_lookup (xlator_t *subvol, loc_t *loc, dict_t *xattr_req,
/* out */
struct iatt *iatt, dict_t **xattr_rsp, struct iatt *parent);
int syncop_readdirp (xlator_t *subvol, fd_t *fd, size_t size, off_t off,
dict_t *dict,
/* out */
gf_dirent_t *entries);
int syncop_readdir (xlator_t *subvol, fd_t *fd, size_t size, off_t off,
gf_dirent_t *entries);
int syncop_opendir (xlator_t *subvol, loc_t *loc, fd_t *fd);
int syncop_setattr (xlator_t *subvol, loc_t *loc, struct iatt *iatt, int valid,
/* out */
struct iatt *preop, struct iatt *postop);
int syncop_fsetattr (xlator_t *subvol, fd_t *fd, struct iatt *iatt, int valid,
/* out */
struct iatt *preop, struct iatt *postop);
int syncop_statfs (xlator_t *subvol, loc_t *loc, struct statvfs *buf);
int syncop_setxattr (xlator_t *subvol, loc_t *loc, dict_t *dict, int32_t flags);
int syncop_fsetxattr (xlator_t *subvol, fd_t *fd, dict_t *dict, int32_t flags);
int syncop_listxattr (xlator_t *subvol, loc_t *loc, dict_t **dict);
int syncop_getxattr (xlator_t *xl, loc_t *loc, dict_t **dict, const char *key);
int syncop_fgetxattr (xlator_t *xl, fd_t *fd, dict_t **dict, const char *key);
int syncop_removexattr (xlator_t *subvol, loc_t *loc, const char *name);
int syncop_fremovexattr (xlator_t *subvol, fd_t *fd, const char *name);
int syncop_create (xlator_t *subvol, loc_t *loc, int32_t flags, mode_t mode,
fd_t *fd, dict_t *dict, struct iatt *iatt);
int syncop_open (xlator_t *subvol, loc_t *loc, int32_t flags, fd_t *fd);
int syncop_close (fd_t *fd);
int syncop_write (xlator_t *subvol, fd_t *fd, const char *buf, int size,
off_t offset, struct iobref *iobref, uint32_t flags);
int syncop_writev (xlator_t *subvol, fd_t *fd, const struct iovec *vector,
int32_t count, off_t offset, struct iobref *iobref,
uint32_t flags);
int syncop_readv (xlator_t *subvol, fd_t *fd, size_t size, off_t off,
uint32_t flags,
/* out */
struct iovec **vector, int *count, struct iobref **iobref);
int syncop_ftruncate (xlator_t *subvol, fd_t *fd, off_t offset);
int syncop_truncate (xlator_t *subvol, loc_t *loc, off_t offset);
int syncop_unlink (xlator_t *subvol, loc_t *loc);
int syncop_rmdir (xlator_t *subvol, loc_t *loc);
int syncop_fsync (xlator_t *subvol, fd_t *fd, int dataonly);
int syncop_flush (xlator_t *subvol, fd_t *fd);
int syncop_fstat (xlator_t *subvol, fd_t *fd, struct iatt *stbuf);
int syncop_stat (xlator_t *subvol, loc_t *loc, struct iatt *stbuf);
int syncop_symlink (xlator_t *subvol, loc_t *loc, const char *newpath,
dict_t *dict, struct iatt *iatt);
int syncop_readlink (xlator_t *subvol, loc_t *loc, char **buffer, size_t size);
int syncop_mknod (xlator_t *subvol, loc_t *loc, mode_t mode, dev_t rdev,
dict_t *dict, struct iatt *iatt);
int syncop_mkdir (xlator_t *subvol, loc_t *loc, mode_t mode, dict_t *dict,
struct iatt *iatt);
int syncop_link (xlator_t *subvol, loc_t *oldloc, loc_t *newloc);
int syncop_fsyncdir (xlator_t *subvol, fd_t *fd, int datasync);
int syncop_access (xlator_t *subvol, loc_t *loc, int32_t mask);
int syncop_rename (xlator_t *subvol, loc_t *oldloc, loc_t *newloc);
int syncop_lk (xlator_t *subvol, fd_t *fd, int cmd, struct gf_flock *flock);
#endif /* _SYNCOP_H */
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