274 lines
6.9 KiB
C
274 lines
6.9 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#ifndef __LM_INTERFACE_DOT_H__
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#define __LM_INTERFACE_DOT_H__
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typedef void (*lm_callback_t) (void *ptr, unsigned int type, void *data);
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/*
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* lm_mount() flags
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*
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* LM_MFLAG_SPECTATOR
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* GFS is asking to join the filesystem's lockspace, but it doesn't want to
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* modify the filesystem. The lock module shouldn't assign a journal to the FS
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* mount. It shouldn't send recovery callbacks to the FS mount. If the node
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* dies or withdraws, all locks can be wiped immediately.
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*/
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#define LM_MFLAG_SPECTATOR 0x00000001
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/*
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* lm_lockstruct flags
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*
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* LM_LSFLAG_LOCAL
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* The lock_nolock module returns LM_LSFLAG_LOCAL to GFS, indicating that GFS
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* can make single-node optimizations.
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*/
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#define LM_LSFLAG_LOCAL 0x00000001
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/*
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* lm_lockname types
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*/
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#define LM_TYPE_RESERVED 0x00
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#define LM_TYPE_NONDISK 0x01
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#define LM_TYPE_INODE 0x02
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#define LM_TYPE_RGRP 0x03
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#define LM_TYPE_META 0x04
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#define LM_TYPE_IOPEN 0x05
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#define LM_TYPE_FLOCK 0x06
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#define LM_TYPE_PLOCK 0x07
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#define LM_TYPE_QUOTA 0x08
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#define LM_TYPE_JOURNAL 0x09
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/*
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* lm_lock() states
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*
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* SHARED is compatible with SHARED, not with DEFERRED or EX.
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* DEFERRED is compatible with DEFERRED, not with SHARED or EX.
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*/
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#define LM_ST_UNLOCKED 0
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#define LM_ST_EXCLUSIVE 1
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#define LM_ST_DEFERRED 2
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#define LM_ST_SHARED 3
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/*
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* lm_lock() flags
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*
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* LM_FLAG_TRY
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* Don't wait to acquire the lock if it can't be granted immediately.
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*
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* LM_FLAG_TRY_1CB
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* Send one blocking callback if TRY is set and the lock is not granted.
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*
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* LM_FLAG_NOEXP
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* GFS sets this flag on lock requests it makes while doing journal recovery.
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* These special requests should not be blocked due to the recovery like
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* ordinary locks would be.
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*
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* LM_FLAG_ANY
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* A SHARED request may also be granted in DEFERRED, or a DEFERRED request may
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* also be granted in SHARED. The preferred state is whichever is compatible
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* with other granted locks, or the specified state if no other locks exist.
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*
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* LM_FLAG_PRIORITY
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* Override fairness considerations. Suppose a lock is held in a shared state
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* and there is a pending request for the deferred state. A shared lock
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* request with the priority flag would be allowed to bypass the deferred
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* request and directly join the other shared lock. A shared lock request
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* without the priority flag might be forced to wait until the deferred
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* requested had acquired and released the lock.
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*/
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#define LM_FLAG_TRY 0x00000001
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#define LM_FLAG_TRY_1CB 0x00000002
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#define LM_FLAG_NOEXP 0x00000004
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#define LM_FLAG_ANY 0x00000008
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#define LM_FLAG_PRIORITY 0x00000010
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/*
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* lm_lock() and lm_async_cb return flags
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*
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* LM_OUT_ST_MASK
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* Masks the lower two bits of lock state in the returned value.
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*
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* LM_OUT_CACHEABLE
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* The lock hasn't been released so GFS can continue to cache data for it.
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*
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* LM_OUT_CANCELED
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* The lock request was canceled.
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*
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* LM_OUT_ASYNC
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* The result of the request will be returned in an LM_CB_ASYNC callback.
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*/
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#define LM_OUT_ST_MASK 0x00000003
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#define LM_OUT_CACHEABLE 0x00000004
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#define LM_OUT_CANCELED 0x00000008
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#define LM_OUT_ASYNC 0x00000080
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#define LM_OUT_ERROR 0x00000100
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/*
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* lm_callback_t types
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*
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* LM_CB_NEED_E LM_CB_NEED_D LM_CB_NEED_S
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* Blocking callback, a remote node is requesting the given lock in
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* EXCLUSIVE, DEFERRED, or SHARED.
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*
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* LM_CB_NEED_RECOVERY
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* The given journal needs to be recovered.
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*
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* LM_CB_DROPLOCKS
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* Reduce the number of cached locks.
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*
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* LM_CB_ASYNC
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* The given lock has been granted.
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*/
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#define LM_CB_NEED_E 257
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#define LM_CB_NEED_D 258
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#define LM_CB_NEED_S 259
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#define LM_CB_NEED_RECOVERY 260
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#define LM_CB_DROPLOCKS 261
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#define LM_CB_ASYNC 262
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/*
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* lm_recovery_done() messages
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*/
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#define LM_RD_GAVEUP 308
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#define LM_RD_SUCCESS 309
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struct lm_lockname {
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u64 ln_number;
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unsigned int ln_type;
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};
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#define lm_name_equal(name1, name2) \
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(((name1)->ln_number == (name2)->ln_number) && \
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((name1)->ln_type == (name2)->ln_type)) \
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struct lm_async_cb {
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struct lm_lockname lc_name;
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int lc_ret;
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};
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struct lm_lockstruct;
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struct lm_lockops {
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const char *lm_proto_name;
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/*
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* Mount/Unmount
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*/
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int (*lm_mount) (char *table_name, char *host_data,
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lm_callback_t cb, void *cb_data,
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unsigned int min_lvb_size, int flags,
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struct lm_lockstruct *lockstruct,
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struct kobject *fskobj);
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void (*lm_others_may_mount) (void *lockspace);
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void (*lm_unmount) (void *lockspace);
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void (*lm_withdraw) (void *lockspace);
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/*
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* Lock oriented operations
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*/
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int (*lm_get_lock) (void *lockspace, struct lm_lockname *name, void **lockp);
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void (*lm_put_lock) (void *lock);
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unsigned int (*lm_lock) (void *lock, unsigned int cur_state,
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unsigned int req_state, unsigned int flags);
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unsigned int (*lm_unlock) (void *lock, unsigned int cur_state);
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void (*lm_cancel) (void *lock);
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int (*lm_hold_lvb) (void *lock, char **lvbp);
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void (*lm_unhold_lvb) (void *lock, char *lvb);
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/*
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* Posix Lock oriented operations
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*/
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int (*lm_plock_get) (void *lockspace, struct lm_lockname *name,
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struct file *file, struct file_lock *fl);
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int (*lm_plock) (void *lockspace, struct lm_lockname *name,
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struct file *file, int cmd, struct file_lock *fl);
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int (*lm_punlock) (void *lockspace, struct lm_lockname *name,
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struct file *file, struct file_lock *fl);
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/*
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* Client oriented operations
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*/
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void (*lm_recovery_done) (void *lockspace, unsigned int jid,
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unsigned int message);
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struct module *lm_owner;
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};
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/*
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* lm_mount() return values
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*
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* ls_jid - the journal ID this node should use
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* ls_first - this node is the first to mount the file system
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* ls_lvb_size - size in bytes of lock value blocks
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* ls_lockspace - lock module's context for this file system
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* ls_ops - lock module's functions
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* ls_flags - lock module features
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*/
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struct lm_lockstruct {
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unsigned int ls_jid;
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unsigned int ls_first;
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unsigned int ls_lvb_size;
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void *ls_lockspace;
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const struct lm_lockops *ls_ops;
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int ls_flags;
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};
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/*
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* Lock module bottom interface. A lock module makes itself available to GFS
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* with these functions.
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*/
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int gfs2_register_lockproto(const struct lm_lockops *proto);
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void gfs2_unregister_lockproto(const struct lm_lockops *proto);
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/*
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* Lock module top interface. GFS calls these functions when mounting or
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* unmounting a file system.
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*/
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int gfs2_mount_lockproto(char *proto_name, char *table_name, char *host_data,
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lm_callback_t cb, void *cb_data,
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unsigned int min_lvb_size, int flags,
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struct lm_lockstruct *lockstruct,
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struct kobject *fskobj);
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void gfs2_unmount_lockproto(struct lm_lockstruct *lockstruct);
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void gfs2_withdraw_lockproto(struct lm_lockstruct *lockstruct);
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#endif /* __LM_INTERFACE_DOT_H__ */
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