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/*
Copyright (c) 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 _LEASES_H
#define _LEASES_H
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "common-utils.h"
#include "glusterfs.h"
#include "xlator.h"
#include "call-stub.h"
#include "logging.h"
#include "client_t.h"
#include "lkowner.h"
#include "locking.h"
#include "upcall-utils.h"
#include "timer-wheel.h"
#include "leases-mem-types.h"
#include "leases-messages.h"
/* The time period for which a client lease lock will be stored after its been
* recalled for the first time. */
#define RECALL_LEASE_LK_TIMEOUT "60"
#define DATA_MODIFY_FOP 0x0001
#define BLOCKING_FOP 0x0002
#define BLOCK_FOP 0x0001
#define WIND_FOP 0x0002
#define EXIT_IF_LEASES_OFF(this, label) do { \
if (!is_leases_enabled(this)) \
goto label; \
} while (0)
#define GET_LEASE_ID(xdata, lease_id, client_uid) do { \
int ret_val = -1; \
ret_val = dict_get_bin (xdata, "lease-id", (void **)&lease_id); \
if (ret_val) { \
ret_val = 0; \
gf_msg_debug ("leases", 0, "Lease id is not set for client:%s", client_uid); \
} \
} while (0)
#define GET_FLAGS(fop, fd_flags) \
do { \
if ((fd_flags & (O_WRONLY | O_RDWR)) && fop == GF_FOP_OPEN) \
fop_flags = DATA_MODIFY_FOP; \
\
if (fop == GF_FOP_UNLINK || fop == GF_FOP_RENAME || \
fop == GF_FOP_TRUNCATE || fop == GF_FOP_FTRUNCATE || \
fop == GF_FOP_FLUSH || fop == GF_FOP_FSYNC || \
fop == GF_FOP_WRITE || fop == GF_FOP_FALLOCATE || \
fop == GF_FOP_DISCARD || fop == GF_FOP_ZEROFILL || \
fop == GF_FOP_SETATTR || fop == GF_FOP_FSETATTR || \
fop == GF_FOP_LINK) \
fop_flags = DATA_MODIFY_FOP; \
\
if (!(fd_flags & (O_NONBLOCK | O_NDELAY))) \
fop_flags |= BLOCKING_FOP; \
\
} while (0) \
#define GET_FLAGS_LK(cmd, l_type, fd_flags) \
do { \
/* TODO: handle F_RESLK_LCK and other glusterfs_lk_recovery_cmds_t */ \
if ((cmd == F_SETLKW || cmd == F_SETLKW64 || \
cmd == F_SETLK || cmd == F_SETLK64) && \
l_type == F_WRLCK) \
fop_flags = DATA_MODIFY_FOP; \
\
if (fd_flags & (O_NONBLOCK | O_NDELAY) && \
(cmd == F_SETLKW || cmd == F_SETLKW64)) \
fop_flags |= BLOCKING_FOP; \
\
} while (0) \
#define LEASE_BLOCK_FOP(inode, fop_name, frame, this, params ...) \
do { \
call_stub_t *__stub = NULL; \
fop_stub_t *blk_fop = NULL; \
lease_inode_ctx_t *lease_ctx = NULL; \
\
__stub = fop_##fop_name##_stub (frame, default_##fop_name##_resume, \
params); \
if (!__stub) { \
gf_msg (this->name, GF_LOG_WARNING, ENOMEM, \
LEASE_MSG_NO_MEM, \
"Unable to create stub"); \
ret = -ENOMEM; \
goto __out; \
} \
\
blk_fop = GF_CALLOC (1, sizeof (*blk_fop), \
gf_leases_mt_fop_stub_t); \
if (!blk_fop) { \
gf_msg (this->name, GF_LOG_WARNING, ENOMEM, \
LEASE_MSG_NO_MEM, \
"Unable to create lease fop stub"); \
ret = -ENOMEM; \
goto __out; \
} \
\
lease_ctx = lease_ctx_get (inode, this); \
if (!lease_ctx) { \
gf_msg (this->name, GF_LOG_WARNING, ENOMEM, \
LEASE_MSG_NO_MEM, \
"Unable to create/get inode ctx"); \
ret = -ENOMEM; \
goto __out; \
} \
\
blk_fop->stub = __stub; \
pthread_mutex_lock (&lease_ctx->lock); \
{ \
/*TODO: If the lease is unlocked btw check lease conflict and \
* by now, then this fop shouldn't be add to the blocked fop \
* list, can use generation number for the same?*/ \
list_add_tail (&blk_fop->list, &lease_ctx->blocked_list); \
} \
pthread_mutex_unlock (&lease_ctx->lock); \
\
__out: \
if (ret < 0) { \
gf_msg (this->name, GF_LOG_WARNING, ENOMEM, LEASE_MSG_NO_MEM, \
"Unable to create stub for blocking the fop:%s (%s)", \
gf_fop_list[frame->root->op], strerror(ENOMEM)); \
if (__stub != NULL) { \
call_stub_destroy (__stub); \
} \
GF_FREE (blk_fop); \
goto err; \
} \
} while (0) \
struct _leases_private {
gf_boolean_t leases_enabled;
int32_t recall_lease_timeout;
struct list_head client_list;
struct list_head recall_list;
struct tvec_base *timer_wheel; /* timer wheel where the recall request
is qued and waits for unlock/expiry */
gf_boolean_t fini;
pthread_t recall_thr;
gf_boolean_t inited_recall_thr;
pthread_mutex_t mutex;
pthread_cond_t cond;
};
typedef struct _leases_private leases_private_t;
struct _lease_client {
char *client_uid;
struct list_head client_list;
struct list_head inode_list;
};
typedef struct _lease_client lease_client_t;
struct _lease_inode {
inode_t *inode;
struct list_head list; /* This can be part of both inode_list and recall_list */
};
typedef struct _lease_inode lease_inode_t;
struct _lease_fd_ctx {
char *client_uid;
char lease_id[LEASE_ID_SIZE];
};
typedef struct _lease_fd_ctx lease_fd_ctx_t;
struct _lease_inode_ctx {
struct list_head lease_id_list; /* clients that have taken leases */
int lease_type_cnt[GF_LEASE_MAX_TYPE+1];
int lease_type; /* Types of leases acquired */
uint64_t lease_cnt; /* Total number of leases on this inode */
uint64_t openfd_cnt; /* number of fds open */
gf_boolean_t recall_in_progress; /* if lease recall is sent on this inode */
struct list_head blocked_list; /* List of fops blocked until the
lease recall is complete */
inode_t *inode; /* this represents the inode on which the
lock was taken, required mainly during
disconnect cleanup */
struct gf_tw_timer_list *timer;
pthread_mutex_t lock;
};
typedef struct _lease_inode_ctx lease_inode_ctx_t;
struct _lease_id_entry {
struct list_head lease_id_list;
char lease_id[LEASE_ID_SIZE];
char *client_uid; /* uid of the client that has
taken the lease */
int lease_type_cnt[GF_LEASE_MAX_TYPE+1]; /* count of each lease type */
int lease_type; /* Union of all the leases taken
under the given lease id */
uint64_t lease_cnt; /* Number of leases taken under the
given lease id */
time_t recall_time; /* time @ which recall was sent */
};
typedef struct _lease_id_entry lease_id_entry_t;
/* Required? as stub itself will have list */
struct __fop_stub {
struct list_head list;
call_stub_t *stub;
};
typedef struct __fop_stub fop_stub_t;
struct __lease_timer_data {
inode_t *inode;
xlator_t *this;
};
typedef struct __lease_timer_data lease_timer_data_t;
gf_boolean_t
is_leases_enabled (xlator_t *this);
int32_t
get_recall_lease_timeout (xlator_t *this);
lease_inode_ctx_t *
lease_ctx_get (inode_t *inode, xlator_t *this);
int
process_lease_req (call_frame_t *frame, xlator_t *this,
inode_t *inode, struct gf_lease *lease);
int
check_lease_conflict (call_frame_t *frame, inode_t *inode,
const char *lease_id, uint32_t fop_flags);
int
cleanup_client_leases (xlator_t *this, const char *client_uid);
void *
expired_recall_cleanup (void *data);
#endif /* _LEASES_H */
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