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/*
Copyright (c) 2013 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.
*/
#include <sys/stat.h>
#include <sys/types.h>
#define LEADER_XATTR "user.nsr.leader"
#define SECOND_CHILD(xl) (xl->children->next->xlator)
#define RECONCILER_PATH NSR_SCRIPT_PREFIX"/reconciler.py"
#define CHANGELOG_ENTRY_SIZE 128
enum {
gf_mt_nsr_private_t = gf_common_mt_end + 1,
gf_mt_nsr_fd_ctx_t,
gf_mt_nsr_inode_ctx_t,
gf_mt_nsr_dirty_t,
gf_mt_nsr_end
};
typedef enum nsr_recon_notify_ev_id_t {
NSR_RECON_SET_LEADER = 1,
NSR_RECON_ADD_CHILD = 2
} nsr_recon_notify_ev_id_t;
typedef struct _nsr_recon_notify_ev_s {
nsr_recon_notify_ev_id_t id;
uint32_t index; /* in case of add */
struct list_head list;
} nsr_recon_notify_ev_t;
typedef struct {
/*
* This is a hack to allow a non-leader to accept requests while the
* leader is down, and it only works for n=2. The way it works is that
* "config_leader" indicates the state from our options (via init or
* reconfigure) but "leader" is what the fop code actually looks at. If
* config_leader is true, then leader will *always* be true as well,
* giving that brick precedence. If config_leader is false, then
* leader will only be true if there is no connection to the other
* brick (tracked in nsr_notify).
*
* TBD: implement real leader election
*/
gf_boolean_t config_leader;
gf_boolean_t leader;
uint8_t up_children;
uint8_t n_children;
char *vol_file;
uint32_t current_term;
uint32_t kid_state;
gf_lock_t dirty_lock;
struct list_head dirty_fds;
uint32_t index;
gf_lock_t index_lock;
double quorum_pct;
int term_fd;
long term_total;
long term_read;
/*
* This is a super-duper hack, but it will do for now. The reason it's
* a hack is that we pass this to dict_set_static_bin, so we don't have
* to mess around with allocating and freeing it on every single IPC
* request, but it's totally not thread-safe. On the other hand, there
* should only be one reconciliation thread running and calling these
* functions at a time, so maybe that doesn't matter.
*
* TBD: re-evaluate how to manage this
*/
char term_buf[CHANGELOG_ENTRY_SIZE];
gf_boolean_t child_up; /* To maintain the state of *
* the translator */
} nsr_private_t;
typedef struct {
call_stub_t *stub;
call_stub_t *qstub;
uint32_t call_count;
uint32_t successful_acks;
uint32_t successful_op_ret;
fd_t *fd;
struct list_head qlinks;
} nsr_local_t;
/*
* This should match whatever changelog returns on the pre-op for us to pass
* when we're ready for our post-op.
*/
typedef uint32_t log_id_t;
typedef struct {
struct list_head links;
log_id_t id;
} nsr_dirty_list_t;
typedef struct {
fd_t *fd;
struct list_head dirty_list;
struct list_head fd_list;
} nsr_fd_ctx_t;
typedef struct {
gf_lock_t lock;
uint32_t active;
struct list_head aqueue;
uint32_t pending;
struct list_head pqueue;
} nsr_inode_ctx_t;
void nsr_start_reconciler (xlator_t *this);
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