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kernel-fxtec-pro1x/fs/ocfs2/dlm/dlmcommon.h
Wengang Wang d9ef75221a ocfs2:dlm: avoid dlm->ast_lock lockres->spinlock dependency break 
Currently we process a dirty lockres with the lockres->spinlock taken. While
during the process, we may need to lock on dlm->ast_lock. This breaks the
dependency of dlm->ast_lock(lock first) and lockres->spinlock(lock second).

This patch fixes the problem.
Since we can't release lockres->spinlock, we have to take dlm->ast_lock
just before taking the lockres->spinlock and release it after lockres->spinlock
is released. And use __dlm_queue_bast()/__dlm_queue_ast(), the nolock version,
in dlm_shuffle_lists(). There are no too many locks on a lockres, so there is no
performance harm.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-05-18 16:41:34 -07:00

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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 << 17)
#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_mle_type {
DLM_MLE_BLOCK,
DLM_MLE_MASTER,
DLM_MLE_MIGRATION,
DLM_MLE_NUM_TYPES
};
struct dlm_master_list_entry {
struct hlist_node master_hash_node;
struct list_head hb_events;
struct dlm_ctxt *dlm;
spinlock_t spinlock;
wait_queue_head_t wq;
atomic_t woken;
struct kref mle_refs;
int inuse;
unsigned long maybe_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
unsigned long vote_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
unsigned long response_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
u8 master;
u8 new_master;
enum dlm_mle_type type;
struct o2hb_callback_func mle_hb_up;
struct o2hb_callback_func mle_hb_down;
struct dlm_lock_resource *mleres;
unsigned char mname[DLM_LOCKID_NAME_MAX];
unsigned int mnamelen;
unsigned int mnamehash;
};
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;
struct list_head tracking_list;
unsigned int purge_count;
spinlock_t spinlock;
spinlock_t ast_lock;
spinlock_t track_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 hlist_head **master_hash;
struct list_head mle_hb_events;
/* these give a really vague idea of the system load */
atomic_t mle_tot_count[DLM_MLE_NUM_TYPES];
atomic_t mle_cur_count[DLM_MLE_NUM_TYPES];
atomic_t res_tot_count;
atomic_t res_cur_count;
struct dlm_debug_ctxt *dlm_debug_ctxt;
struct dentry *dlm_debugfs_subroot;
/* 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);
}
static inline struct hlist_head *dlm_master_hash(struct dlm_ctxt *dlm,
unsigned i)
{
return dlm->master_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;
u8 extra_ref;
};
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
/* Added during init and removed during release */
struct list_head tracking; /* dlm->tracking_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;
struct dlm_ctxt *dlm;
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,
};
struct dlm_query_join_packet {
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;
};
union dlm_query_join_response {
u32 intval;
struct dlm_query_join_packet 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);
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_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));
}
void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
/* create/destroy slab caches */
int dlm_init_master_caches(void);
void dlm_destroy_master_caches(void);
int dlm_init_lock_cache(void);
void dlm_destroy_lock_cache(void);
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;
}
static inline void dlm_set_lockres_owner(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
u8 owner)
{
assert_spin_locked(&res->spinlock);
res->owner = owner;
}
static inline void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
u8 owner)
{
assert_spin_locked(&res->spinlock);
if (owner != res->owner)
dlm_set_lockres_owner(dlm, res, owner);
}
#endif /* DLMCOMMON_H */
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