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linux/fs/ocfs2/dlm/dlmcommon.h
Joel Becker d24fbcda0c ocfs2: Negotiate locking protocol versions. 
Currently, when ocfs2 nodes connect via TCP, they advertise their
compatibility level.  If the versions do not match, two nodes cannot speak
to each other and they disconnect. As a result, this provides no forward or
backwards compatibility.

This patch implements a simple protocol negotiation at the dlm level by
introducing a major/minor version number scheme for entities that
communicate.  Specifically, o2dlm has a major/minor version for interaction
with o2dlm on other nodes, and ocfs2 itself has a major/minor version for
interacting with the filesystem on other nodes.

This will allow rolling upgrades of ocfs2 clusters when changes to the
locking or network protocols can be done in a backwards compatible manner.
In those cases, only the minor number is changed and the negotatied protocol
minor is returned from dlm join. In the far less likely event that a
required protocol change makes backwards compatibility impossible, we simply
bump the major number.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
2008-02-06 16:11:29 -08:00

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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* dlmcommon.h
*
* Copyright (C) 2004 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*
*/
#ifndef DLMCOMMON_H
#define DLMCOMMON_H
#include <linux/kref.h>
#define DLM_HB_NODE_DOWN_PRI (0xf000000)
#define DLM_HB_NODE_UP_PRI (0x8000000)
#define DLM_LOCKID_NAME_MAX 32
#define DLM_DOMAIN_NAME_MAX_LEN 255
#define DLM_LOCK_RES_OWNER_UNKNOWN O2NM_MAX_NODES
#define DLM_THREAD_SHUFFLE_INTERVAL 5 // flush everything every 5 passes
#define DLM_THREAD_MS 200 // flush at least every 200 ms
#define DLM_HASH_SIZE_DEFAULT (1 << 14)
#if DLM_HASH_SIZE_DEFAULT < PAGE_SIZE
# define DLM_HASH_PAGES 1
#else
# define DLM_HASH_PAGES (DLM_HASH_SIZE_DEFAULT / PAGE_SIZE)
#endif
#define DLM_BUCKETS_PER_PAGE (PAGE_SIZE / sizeof(struct hlist_head))
#define DLM_HASH_BUCKETS (DLM_HASH_PAGES * DLM_BUCKETS_PER_PAGE)
/* Intended to make it easier for us to switch out hash functions */
#define dlm_lockid_hash(_n, _l) full_name_hash(_n, _l)
enum dlm_ast_type {
DLM_AST = 0,
DLM_BAST,
DLM_ASTUNLOCK
};
#define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
#define DLM_RECOVERY_LOCK_NAME "$RECOVERY"
#define DLM_RECOVERY_LOCK_NAME_LEN 9
static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
{
if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
return 1;
return 0;
}
#define DLM_RECO_STATE_ACTIVE 0x0001
#define DLM_RECO_STATE_FINALIZE 0x0002
struct dlm_recovery_ctxt
{
struct list_head resources;
struct list_head received;
struct list_head node_data;
u8 new_master;
u8 dead_node;
u16 state;
unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
wait_queue_head_t event;
};
enum dlm_ctxt_state {
DLM_CTXT_NEW = 0,
DLM_CTXT_JOINED,
DLM_CTXT_IN_SHUTDOWN,
DLM_CTXT_LEAVING,
};
struct dlm_ctxt
{
struct list_head list;
struct hlist_head **lockres_hash;
struct list_head dirty_list;
struct list_head purge_list;
struct list_head pending_asts;
struct list_head pending_basts;
unsigned int purge_count;
spinlock_t spinlock;
spinlock_t ast_lock;
char *name;
u8 node_num;
u32 key;
u8 joining_node;
wait_queue_head_t dlm_join_events;
unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
struct dlm_recovery_ctxt reco;
spinlock_t master_lock;
struct list_head master_list;
struct list_head mle_hb_events;
/* these give a really vague idea of the system load */
atomic_t local_resources;
atomic_t remote_resources;
atomic_t unknown_resources;
/* NOTE: Next three are protected by dlm_domain_lock */
struct kref dlm_refs;
enum dlm_ctxt_state dlm_state;
unsigned int num_joins;
struct o2hb_callback_func dlm_hb_up;
struct o2hb_callback_func dlm_hb_down;
struct task_struct *dlm_thread_task;
struct task_struct *dlm_reco_thread_task;
struct workqueue_struct *dlm_worker;
wait_queue_head_t dlm_thread_wq;
wait_queue_head_t dlm_reco_thread_wq;
wait_queue_head_t ast_wq;
wait_queue_head_t migration_wq;
struct work_struct dispatched_work;
struct list_head work_list;
spinlock_t work_lock;
struct list_head dlm_domain_handlers;
struct list_head dlm_eviction_callbacks;
/* The filesystem specifies this at domain registration. We
* cache it here to know what to tell other nodes. */
struct dlm_protocol_version fs_locking_proto;
/* This is the inter-dlm communication version */
struct dlm_protocol_version dlm_locking_proto;
};
static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
{
return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE);
}
/* these keventd work queue items are for less-frequently
* called functions that cannot be directly called from the
* net message handlers for some reason, usually because
* they need to send net messages of their own. */
void dlm_dispatch_work(struct work_struct *work);
struct dlm_lock_resource;
struct dlm_work_item;
typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
struct dlm_request_all_locks_priv
{
u8 reco_master;
u8 dead_node;
};
struct dlm_mig_lockres_priv
{
struct dlm_lock_resource *lockres;
u8 real_master;
};
struct dlm_assert_master_priv
{
struct dlm_lock_resource *lockres;
u8 request_from;
u32 flags;
unsigned ignore_higher:1;
};
struct dlm_deref_lockres_priv
{
struct dlm_lock_resource *deref_res;
u8 deref_node;
};
struct dlm_work_item
{
struct list_head list;
dlm_workfunc_t *func;
struct dlm_ctxt *dlm;
void *data;
union {
struct dlm_request_all_locks_priv ral;
struct dlm_mig_lockres_priv ml;
struct dlm_assert_master_priv am;
struct dlm_deref_lockres_priv dl;
} u;
};
static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
struct dlm_work_item *i,
dlm_workfunc_t *f, void *data)
{
memset(i, 0, sizeof(*i));
i->func = f;
INIT_LIST_HEAD(&i->list);
i->data = data;
i->dlm = dlm; /* must have already done a dlm_grab on this! */
}
static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
u8 node)
{
assert_spin_locked(&dlm->spinlock);
dlm->joining_node = node;
wake_up(&dlm->dlm_join_events);
}
#define DLM_LOCK_RES_UNINITED 0x00000001
#define DLM_LOCK_RES_RECOVERING 0x00000002
#define DLM_LOCK_RES_READY 0x00000004
#define DLM_LOCK_RES_DIRTY 0x00000008
#define DLM_LOCK_RES_IN_PROGRESS 0x00000010
#define DLM_LOCK_RES_MIGRATING 0x00000020
#define DLM_LOCK_RES_DROPPING_REF 0x00000040
#define DLM_LOCK_RES_BLOCK_DIRTY 0x00001000
#define DLM_LOCK_RES_SETREF_INPROG 0x00002000
/* max milliseconds to wait to sync up a network failure with a node death */
#define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
#define DLM_PURGE_INTERVAL_MS (8 * 1000)
struct dlm_lock_resource
{
/* WARNING: Please see the comment in dlm_init_lockres before
* adding fields here. */
struct hlist_node hash_node;
struct qstr lockname;
struct kref refs;
/*
* Please keep granted, converting, and blocked in this order,
* as some funcs want to iterate over all lists.
*
* All four lists are protected by the hash's reference.
*/
struct list_head granted;
struct list_head converting;
struct list_head blocked;
struct list_head purge;
/*
* These two lists require you to hold an additional reference
* while they are on the list.
*/
struct list_head dirty;
struct list_head recovering; // dlm_recovery_ctxt.resources list
/* unused lock resources have their last_used stamped and are
* put on a list for the dlm thread to run. */
unsigned long last_used;
unsigned migration_pending:1;
atomic_t asts_reserved;
spinlock_t spinlock;
wait_queue_head_t wq;
u8 owner; //node which owns the lock resource, or unknown
u16 state;
char lvb[DLM_LVB_LEN];
unsigned int inflight_locks;
unsigned long refmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
};
struct dlm_migratable_lock
{
__be64 cookie;
/* these 3 are just padding for the in-memory structure, but
* list and flags are actually used when sent over the wire */
__be16 pad1;
u8 list; // 0=granted, 1=converting, 2=blocked
u8 flags;
s8 type;
s8 convert_type;
s8 highest_blocked;
u8 node;
}; // 16 bytes
struct dlm_lock
{
struct dlm_migratable_lock ml;
struct list_head list;
struct list_head ast_list;
struct list_head bast_list;
struct dlm_lock_resource *lockres;
spinlock_t spinlock;
struct kref lock_refs;
// ast and bast must be callable while holding a spinlock!
dlm_astlockfunc_t *ast;
dlm_bastlockfunc_t *bast;
void *astdata;
struct dlm_lockstatus *lksb;
unsigned ast_pending:1,
bast_pending:1,
convert_pending:1,
lock_pending:1,
cancel_pending:1,
unlock_pending:1,
lksb_kernel_allocated:1;
};
#define DLM_LKSB_UNUSED1 0x01
#define DLM_LKSB_PUT_LVB 0x02
#define DLM_LKSB_GET_LVB 0x04
#define DLM_LKSB_UNUSED2 0x08
#define DLM_LKSB_UNUSED3 0x10
#define DLM_LKSB_UNUSED4 0x20
#define DLM_LKSB_UNUSED5 0x40
#define DLM_LKSB_UNUSED6 0x80
enum dlm_lockres_list {
DLM_GRANTED_LIST = 0,
DLM_CONVERTING_LIST,
DLM_BLOCKED_LIST
};
static inline int dlm_lvb_is_empty(char *lvb)
{
int i;
for (i=0; i<DLM_LVB_LEN; i++)
if (lvb[i])
return 0;
return 1;
}
static inline struct list_head *
dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
{
struct list_head *ret = NULL;
if (idx == DLM_GRANTED_LIST)
ret = &res->granted;
else if (idx == DLM_CONVERTING_LIST)
ret = &res->converting;
else if (idx == DLM_BLOCKED_LIST)
ret = &res->blocked;
else
BUG();
return ret;
}
struct dlm_node_iter
{
unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
int curnode;
};
enum {
DLM_MASTER_REQUEST_MSG = 500,
DLM_UNUSED_MSG1, /* 501 */
DLM_ASSERT_MASTER_MSG, /* 502 */
DLM_CREATE_LOCK_MSG, /* 503 */
DLM_CONVERT_LOCK_MSG, /* 504 */
DLM_PROXY_AST_MSG, /* 505 */
DLM_UNLOCK_LOCK_MSG, /* 506 */
DLM_DEREF_LOCKRES_MSG, /* 507 */
DLM_MIGRATE_REQUEST_MSG, /* 508 */
DLM_MIG_LOCKRES_MSG, /* 509 */
DLM_QUERY_JOIN_MSG, /* 510 */
DLM_ASSERT_JOINED_MSG, /* 511 */
DLM_CANCEL_JOIN_MSG, /* 512 */
DLM_EXIT_DOMAIN_MSG, /* 513 */
DLM_MASTER_REQUERY_MSG, /* 514 */
DLM_LOCK_REQUEST_MSG, /* 515 */
DLM_RECO_DATA_DONE_MSG, /* 516 */
DLM_BEGIN_RECO_MSG, /* 517 */
DLM_FINALIZE_RECO_MSG /* 518 */
};
struct dlm_reco_node_data
{
int state;
u8 node_num;
struct list_head list;
};
enum {
DLM_RECO_NODE_DATA_DEAD = -1,
DLM_RECO_NODE_DATA_INIT = 0,
DLM_RECO_NODE_DATA_REQUESTING,
DLM_RECO_NODE_DATA_REQUESTED,
DLM_RECO_NODE_DATA_RECEIVING,
DLM_RECO_NODE_DATA_DONE,
DLM_RECO_NODE_DATA_FINALIZE_SENT,
};
enum {
DLM_MASTER_RESP_NO = 0,
DLM_MASTER_RESP_YES,
DLM_MASTER_RESP_MAYBE,
DLM_MASTER_RESP_ERROR
};
struct dlm_master_request
{
u8 node_idx;
u8 namelen;
__be16 pad1;
__be32 flags;
u8 name[O2NM_MAX_NAME_LEN];
};
#define DLM_ASSERT_RESPONSE_REASSERT 0x00000001
#define DLM_ASSERT_RESPONSE_MASTERY_REF 0x00000002
#define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
#define DLM_ASSERT_MASTER_REQUERY 0x00000002
#define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
struct dlm_assert_master
{
u8 node_idx;
u8 namelen;
__be16 pad1;
__be32 flags;
u8 name[O2NM_MAX_NAME_LEN];
};
#define DLM_MIGRATE_RESPONSE_MASTERY_REF 0x00000001
struct dlm_migrate_request
{
u8 master;
u8 new_master;
u8 namelen;
u8 pad1;
__be32 pad2;
u8 name[O2NM_MAX_NAME_LEN];
};
struct dlm_master_requery
{
u8 pad1;
u8 pad2;
u8 node_idx;
u8 namelen;
__be32 pad3;
u8 name[O2NM_MAX_NAME_LEN];
};
#define DLM_MRES_RECOVERY 0x01
#define DLM_MRES_MIGRATION 0x02
#define DLM_MRES_ALL_DONE 0x04
/*
* We would like to get one whole lockres into a single network
* message whenever possible. Generally speaking, there will be
* at most one dlm_lock on a lockres for each node in the cluster,
* plus (infrequently) any additional locks coming in from userdlm.
*
* struct _dlm_lockres_page
* {
* dlm_migratable_lockres mres;
* dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
* u8 pad[DLM_MIG_LOCKRES_RESERVED];
* };
*
* from ../cluster/tcp.h
* NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
* (roughly 4080 bytes)
* and sizeof(dlm_migratable_lockres) = 112 bytes
* and sizeof(dlm_migratable_lock) = 16 bytes
*
* Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
* DLM_MIG_LOCKRES_RESERVED=128 means we have this:
*
* (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
* sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
* NET_MAX_PAYLOAD_BYTES
* (240 * 16) + 112 + 128 = 4080
*
* So a lockres would need more than 240 locks before it would
* use more than one network packet to recover. Not too bad.
*/
#define DLM_MAX_MIGRATABLE_LOCKS 240
struct dlm_migratable_lockres
{
u8 master;
u8 lockname_len;
u8 num_locks; // locks sent in this structure
u8 flags;
__be32 total_locks; // locks to be sent for this migration cookie
__be64 mig_cookie; // cookie for this lockres migration
// or zero if not needed
// 16 bytes
u8 lockname[DLM_LOCKID_NAME_MAX];
// 48 bytes
u8 lvb[DLM_LVB_LEN];
// 112 bytes
struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112
};
#define DLM_MIG_LOCKRES_MAX_LEN \
(sizeof(struct dlm_migratable_lockres) + \
(sizeof(struct dlm_migratable_lock) * \
DLM_MAX_MIGRATABLE_LOCKS) )
/* from above, 128 bytes
* for some undetermined future use */
#define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \
DLM_MIG_LOCKRES_MAX_LEN)
struct dlm_create_lock
{
__be64 cookie;
__be32 flags;
u8 pad1;
u8 node_idx;
s8 requested_type;
u8 namelen;
u8 name[O2NM_MAX_NAME_LEN];
};
struct dlm_convert_lock
{
__be64 cookie;
__be32 flags;
u8 pad1;
u8 node_idx;
s8 requested_type;
u8 namelen;
u8 name[O2NM_MAX_NAME_LEN];
s8 lvb[0];
};
#define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
struct dlm_unlock_lock
{
__be64 cookie;
__be32 flags;
__be16 pad1;
u8 node_idx;
u8 namelen;
u8 name[O2NM_MAX_NAME_LEN];
s8 lvb[0];
};
#define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
struct dlm_proxy_ast
{
__be64 cookie;
__be32 flags;
u8 node_idx;
u8 type;
u8 blocked_type;
u8 namelen;
u8 name[O2NM_MAX_NAME_LEN];
s8 lvb[0];
};
#define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
#define DLM_MOD_KEY (0x666c6172)
enum dlm_query_join_response_code {
JOIN_DISALLOW = 0,
JOIN_OK,
JOIN_OK_NO_MAP,
JOIN_PROTOCOL_MISMATCH,
};
union dlm_query_join_response {
u32 intval;
struct {
u8 code; /* Response code. dlm_minor and fs_minor
are only valid if this is JOIN_OK */
u8 dlm_minor; /* The minor version of the protocol the
dlm is speaking. */
u8 fs_minor; /* The minor version of the protocol the
filesystem is speaking. */
u8 reserved;
} packet;
};
struct dlm_lock_request
{
u8 node_idx;
u8 dead_node;
__be16 pad1;
__be32 pad2;
};
struct dlm_reco_data_done
{
u8 node_idx;
u8 dead_node;
__be16 pad1;
__be32 pad2;
/* unused for now */
/* eventually we can use this to attempt
* lvb recovery based on each node's info */
u8 reco_lvb[DLM_LVB_LEN];
};
struct dlm_begin_reco
{
u8 node_idx;
u8 dead_node;
__be16 pad1;
__be32 pad2;
};
#define BITS_PER_BYTE 8
#define BITS_TO_BYTES(bits) (((bits)+BITS_PER_BYTE-1)/BITS_PER_BYTE)
struct dlm_query_join_request
{
u8 node_idx;
u8 pad1[2];
u8 name_len;
struct dlm_protocol_version dlm_proto;
struct dlm_protocol_version fs_proto;
u8 domain[O2NM_MAX_NAME_LEN];
u8 node_map[BITS_TO_BYTES(O2NM_MAX_NODES)];
};
struct dlm_assert_joined
{
u8 node_idx;
u8 pad1[2];
u8 name_len;
u8 domain[O2NM_MAX_NAME_LEN];
};
struct dlm_cancel_join
{
u8 node_idx;
u8 pad1[2];
u8 name_len;
u8 domain[O2NM_MAX_NAME_LEN];
};
struct dlm_exit_domain
{
u8 node_idx;
u8 pad1[3];
};
struct dlm_finalize_reco
{
u8 node_idx;
u8 dead_node;
u8 flags;
u8 pad1;
__be32 pad2;
};
struct dlm_deref_lockres
{
u32 pad1;
u16 pad2;
u8 node_idx;
u8 namelen;
u8 name[O2NM_MAX_NAME_LEN];
};
static inline enum dlm_status
__dlm_lockres_state_to_status(struct dlm_lock_resource *res)
{
enum dlm_status status = DLM_NORMAL;
assert_spin_locked(&res->spinlock);
if (res->state & DLM_LOCK_RES_RECOVERING)
status = DLM_RECOVERING;
else if (res->state & DLM_LOCK_RES_MIGRATING)
status = DLM_MIGRATING;
else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
status = DLM_FORWARD;
return status;
}
static inline u8 dlm_get_lock_cookie_node(u64 cookie)
{
u8 ret;
cookie >>= 56;
ret = (u8)(cookie & 0xffULL);
return ret;
}
static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
{
unsigned long long ret;
ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
return ret;
}
struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
struct dlm_lockstatus *lksb);
void dlm_lock_get(struct dlm_lock *lock);
void dlm_lock_put(struct dlm_lock *lock);
void dlm_lock_attach_lockres(struct dlm_lock *lock,
struct dlm_lock_resource *res);
int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
void dlm_revert_pending_convert(struct dlm_lock_resource *res,
struct dlm_lock *lock);
void dlm_revert_pending_lock(struct dlm_lock_resource *res,
struct dlm_lock *lock);
int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
struct dlm_lock *lock);
void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
struct dlm_lock *lock);
int dlm_launch_thread(struct dlm_ctxt *dlm);
void dlm_complete_thread(struct dlm_ctxt *dlm);
int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
int dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout);
void dlm_put(struct dlm_ctxt *dlm);
struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res);
void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res);
static inline void dlm_lockres_get(struct dlm_lock_resource *res)
{
/* This is called on every lookup, so it might be worth
* inlining. */
kref_get(&res->refs);
}
void dlm_lockres_put(struct dlm_lock_resource *res);
void __dlm_unhash_lockres(struct dlm_lock_resource *res);
void __dlm_insert_lockres(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res);
struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm,
const char *name,
unsigned int len,
unsigned int hash);
struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
const char *name,
unsigned int len,
unsigned int hash);
struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
const char *name,
unsigned int len);
int dlm_is_host_down(int errno);
void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
u8 owner);
struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
const char *lockid,
int namelen,
int flags);
struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
const char *name,
unsigned int namelen);
#define dlm_lockres_set_refmap_bit(bit,res) \
__dlm_lockres_set_refmap_bit(bit,res,__FILE__,__LINE__)
#define dlm_lockres_clear_refmap_bit(bit,res) \
__dlm_lockres_clear_refmap_bit(bit,res,__FILE__,__LINE__)
static inline void __dlm_lockres_set_refmap_bit(int bit,
struct dlm_lock_resource *res,
const char *file,
int line)
{
//printk("%s:%d:%.*s: setting bit %d\n", file, line,
// res->lockname.len, res->lockname.name, bit);
set_bit(bit, res->refmap);
}
static inline void __dlm_lockres_clear_refmap_bit(int bit,
struct dlm_lock_resource *res,
const char *file,
int line)
{
//printk("%s:%d:%.*s: clearing bit %d\n", file, line,
// res->lockname.len, res->lockname.name, bit);
clear_bit(bit, res->refmap);
}
void __dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
const char *file,
int line);
void __dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
int new_lockres,
const char *file,
int line);
#define dlm_lockres_drop_inflight_ref(d,r) \
__dlm_lockres_drop_inflight_ref(d,r,__FILE__,__LINE__)
#define dlm_lockres_grab_inflight_ref(d,r) \
__dlm_lockres_grab_inflight_ref(d,r,0,__FILE__,__LINE__)
#define dlm_lockres_grab_inflight_ref_new(d,r) \
__dlm_lockres_grab_inflight_ref(d,r,1,__FILE__,__LINE__)
void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
void dlm_do_local_ast(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
struct dlm_lock *lock);
int dlm_do_remote_ast(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
struct dlm_lock *lock);
void dlm_do_local_bast(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
struct dlm_lock *lock,
int blocked_type);
int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
struct dlm_lock *lock,
int msg_type,
int blocked_type, int flags);
static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
struct dlm_lock *lock,
int blocked_type)
{
return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
blocked_type, 0);
}
static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
struct dlm_lock *lock,
int flags)
{
return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
0, flags);
}
void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
int dlm_nm_init(struct dlm_ctxt *dlm);
int dlm_heartbeat_init(struct dlm_ctxt *dlm);
void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
int dlm_finish_migration(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
u8 old_master);
void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res);
void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
void dlm_assert_master_post_handler(int status, void *data, void *ret_data);
int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
u8 nodenum, u8 *real_master);
int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
int ignore_higher,
u8 request_from,
u32 flags);
int dlm_send_one_lockres(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
struct dlm_migratable_lockres *mres,
u8 send_to,
u8 flags);
void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res);
/* will exit holding res->spinlock, but may drop in function */
void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
/* will exit holding res->spinlock, but may drop in function */
static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
{
__dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
DLM_LOCK_RES_RECOVERING|
DLM_LOCK_RES_MIGRATING));
}
int dlm_init_mle_cache(void);
void dlm_destroy_mle_cache(void);
void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
int dlm_drop_lockres_ref(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res);
void dlm_clean_master_list(struct dlm_ctxt *dlm,
u8 dead_node);
int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
int __dlm_lockres_has_locks(struct dlm_lock_resource *res);
int __dlm_lockres_unused(struct dlm_lock_resource *res);
static inline const char * dlm_lock_mode_name(int mode)
{
switch (mode) {
case LKM_EXMODE:
return "EX";
case LKM_PRMODE:
return "PR";
case LKM_NLMODE:
return "NL";
}
return "UNKNOWN";
}
static inline int dlm_lock_compatible(int existing, int request)
{
/* NO_LOCK compatible with all */
if (request == LKM_NLMODE ||
existing == LKM_NLMODE)
return 1;
/* EX incompatible with all non-NO_LOCK */
if (request == LKM_EXMODE)
return 0;
/* request must be PR, which is compatible with PR */
if (existing == LKM_PRMODE)
return 1;
return 0;
}
static inline int dlm_lock_on_list(struct list_head *head,
struct dlm_lock *lock)
{
struct list_head *iter;
struct dlm_lock *tmplock;
list_for_each(iter, head) {
tmplock = list_entry(iter, struct dlm_lock, list);
if (tmplock == lock)
return 1;
}
return 0;
}
static inline enum dlm_status dlm_err_to_dlm_status(int err)
{
enum dlm_status ret;
if (err == -ENOMEM)
ret = DLM_SYSERR;
else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
ret = DLM_NOLOCKMGR;
else if (err == -EINVAL)
ret = DLM_BADPARAM;
else if (err == -ENAMETOOLONG)
ret = DLM_IVBUFLEN;
else
ret = DLM_BADARGS;
return ret;
}
static inline void dlm_node_iter_init(unsigned long *map,
struct dlm_node_iter *iter)
{
memcpy(iter->node_map, map, sizeof(iter->node_map));
iter->curnode = -1;
}
static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
{
int bit;
bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
if (bit >= O2NM_MAX_NODES) {
iter->curnode = O2NM_MAX_NODES;
return -ENOENT;
}
iter->curnode = bit;
return bit;
}
#endif /* DLMCOMMON_H */
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