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/*
Copyright (c) 2006-2012, 2015-2016 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 __POSIX_LOCKS_H__
#define __POSIX_LOCKS_H__
#include "compat-errno.h"
#include "stack.h"
#include "call-stub.h"
#include "locks-mem-types.h"
#include "client_t.h"
#include "lkowner.h"
typedef enum {
MLK_NONE,
MLK_FILE_BASED,
MLK_FORCED,
MLK_OPTIMAL
} mlk_mode_t; /* defines different mandatory locking modes*/
struct __pl_fd;
struct __posix_lock {
struct list_head list;
short fl_type;
off_t fl_start;
off_t fl_end;
uint32_t lk_flags;
short blocked; /* waiting to acquire */
struct gf_flock user_flock; /* the flock supplied by the user */
xlator_t *this; /* required for blocked locks */
unsigned long fd_num;
fd_t *fd;
call_frame_t *frame;
struct timeval blkd_time; /*time at which lock was queued into blkd list*/
struct timeval granted_time; /*time at which lock was queued into active list*/
/* These two together serve to uniquely identify each process
across nodes */
void *client; /* to identify client node */
/* This field uniquely identifies the client the lock belongs to. As
* lock migration is handled by rebalance, the client_t object will be
* overwritten by rebalance and can't be deemed as the owner of the
* lock on destination. Hence, the below field is migrated from
* source to destination by lock_migration_info_t and updated on the
* destination. So that on client-server disconnection, server can
* cleanup the locks proper;y. */
char *client_uid;
gf_lkowner_t owner;
pid_t client_pid; /* pid of client process */
int blocking;
};
typedef struct __posix_lock posix_lock_t;
struct __pl_inode_lock {
struct list_head list;
struct list_head blocked_locks; /* list_head pointing to blocked_inodelks */
int ref;
short fl_type;
off_t fl_start;
off_t fl_end;
const char *volume;
struct gf_flock user_flock; /* the flock supplied by the user */
xlator_t *this; /* required for blocked locks */
struct __pl_inode *pl_inode;
call_frame_t *frame;
struct timeval blkd_time; /*time at which lock was queued into blkd list*/
struct timeval granted_time; /*time at which lock was queued into active list*/
/* These two together serve to uniquely identify each process
across nodes */
void *client; /* to identify client node */
gf_lkowner_t owner;
pid_t client_pid; /* pid of client process */
char *connection_id; /* stores the client connection id */
struct list_head client_list; /* list of all locks from a client */
};
typedef struct __pl_inode_lock pl_inode_lock_t;
struct _pl_rw_req {
struct list_head list;
call_stub_t *stub;
posix_lock_t region;
};
typedef struct _pl_rw_req pl_rw_req_t;
struct _pl_dom_list {
struct list_head inode_list; /* list_head back to pl_inode_t */
const char *domain;
struct list_head entrylk_list; /* List of entry locks */
struct list_head blocked_entrylks; /* List of all blocked entrylks */
struct list_head inodelk_list; /* List of inode locks */
struct list_head blocked_inodelks; /* List of all blocked inodelks */
};
typedef struct _pl_dom_list pl_dom_list_t;
struct __entry_lock {
struct list_head domain_list; /* list_head back to pl_dom_list_t */
struct list_head blocked_locks; /* list_head back to blocked_entrylks */
int ref;
call_frame_t *frame;
xlator_t *this;
struct __pl_inode *pinode;
const char *volume;
const char *basename;
entrylk_type type;
struct timeval blkd_time; /*time at which lock was queued into blkd list*/
struct timeval granted_time; /*time at which lock was queued into active list*/
void *client;
gf_lkowner_t owner;
pid_t client_pid; /* pid of client process */
char *connection_id; /* stores the client connection id */
struct list_head client_list; /* list of all locks from a client */
};
typedef struct __entry_lock pl_entry_lock_t;
/* The "simulated" inode. This contains a list of all the locks associated
with this file */
struct __pl_inode {
pthread_mutex_t mutex;
struct list_head dom_list; /* list of domains */
struct list_head ext_list; /* list of fcntl locks */
struct list_head rw_list; /* list of waiting r/w requests */
struct list_head reservelk_list; /* list of reservelks */
struct list_head blocked_reservelks; /* list of blocked reservelks */
struct list_head blocked_calls; /* List of blocked lock calls while a reserve is held*/
struct list_head metalk_list; /* Meta lock list */
/* This is to store the incoming lock
requests while meta lock is enabled */
struct list_head queued_locks;
int mandatory; /* if mandatory locking is enabled */
inode_t *refkeeper; /* hold refs on an inode while locks are
held to prevent pruning */
uuid_t gfid; /* placeholder for gfid of the inode */
inode_t *inode; /* pointer to be used for ref and unref
of inode_t as long as there are
locks on it */
gf_boolean_t migrated;
};
typedef struct __pl_inode pl_inode_t;
struct __pl_metalk {
pthread_mutex_t mutex;
/* For pl_inode meta lock list */
struct list_head list;
/* For pl_ctx_t list */
struct list_head client_list;
char *client_uid;
pl_inode_t *pl_inode;
int ref;
};
typedef struct __pl_metalk pl_meta_lock_t;
typedef struct {
mlk_mode_t mandatory_mode; /* holds current mandatory locking mode */
gf_boolean_t trace; /* trace lock requests in and out */
char *brickname;
gf_boolean_t monkey_unlocking;
uint32_t revocation_secs;
gf_boolean_t revocation_clear_all;
uint32_t revocation_max_blocked;
} posix_locks_private_t;
typedef struct {
gf_boolean_t entrylk_count_req;
gf_boolean_t inodelk_count_req;
gf_boolean_t posixlk_count_req;
gf_boolean_t parent_entrylk_req;
data_t *inodelk_dom_count_req;
dict_t *xdata;
loc_t loc[2];
fd_t *fd;
off_t offset;
glusterfs_fop_t op;
} pl_local_t;
typedef struct {
struct list_head locks_list;
} pl_fdctx_t;
struct _locker {
struct list_head lockers;
char *volume;
inode_t *inode;
gf_lkowner_t owner;
};
typedef struct _locks_ctx {
pthread_mutex_t lock;
struct list_head inodelk_lockers;
struct list_head entrylk_lockers;
struct list_head metalk_list;
} pl_ctx_t;
pl_ctx_t *
pl_ctx_get (client_t *client, xlator_t *xlator);
int
pl_inodelk_client_cleanup (xlator_t *this, pl_ctx_t *ctx);
int
pl_entrylk_client_cleanup (xlator_t *this, pl_ctx_t *ctx);
#endif /* __POSIX_LOCKS_H__ */
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