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f057f6cdf6
This is the big patch that I've been working on for some time now. There are many reasons for wanting to make this change such as: o Reducing overhead by eliminating duplicated fields between structures o Simplifcation of the code (reduces the code size by a fair bit) o The locking interface is now the DLM interface itself as proposed some time ago. o Fewer lookups of glocks when processing replies from the DLM o Fewer memory allocations/deallocations for each glock o Scope to do further optimisations in the future (but this patch is more than big enough for now!) Please note that (a) this patch relates to the lock_dlm module and not the DLM itself, that is still a separate module; and (b) that we retain the ability to build GFS2 as a standalone single node filesystem with out requiring the DLM. This patch needs a lot of testing, hence my keeping it I restarted my -git tree after the last merge window. That way, this has the maximum exposure before its merged. This is (modulo a few minor bug fixes) the same patch that I've been posting on and off the the last three months and its passed a number of different tests so far. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
264 lines
7.1 KiB
C
264 lines
7.1 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 __GLOCK_DOT_H__
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#define __GLOCK_DOT_H__
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#include <linux/sched.h>
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#include <linux/parser.h>
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#include "incore.h"
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/* Options for hostdata parser */
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enum {
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Opt_jid,
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Opt_id,
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Opt_first,
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Opt_nodir,
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Opt_err,
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};
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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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#define GL_ASYNC 0x00000040
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#define GL_EXACT 0x00000080
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#define GL_SKIP 0x00000100
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#define GL_ATIME 0x00000200
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#define GL_NOCACHE 0x00000400
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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_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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*/
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#define LM_OUT_ST_MASK 0x00000003
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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_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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#define GLR_TRYFAILED 13
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struct lm_lockops {
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const char *lm_proto_name;
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int (*lm_mount) (struct gfs2_sbd *sdp, const char *fsname);
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void (*lm_unmount) (struct gfs2_sbd *sdp);
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void (*lm_withdraw) (struct gfs2_sbd *sdp);
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void (*lm_put_lock) (struct kmem_cache *cachep, void *gl);
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unsigned int (*lm_lock) (struct gfs2_glock *gl,
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unsigned int req_state, unsigned int flags);
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void (*lm_cancel) (struct gfs2_glock *gl);
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const match_table_t *lm_tokens;
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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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#define GL_ASYNC 0x00000040
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#define GL_EXACT 0x00000080
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#define GL_SKIP 0x00000100
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#define GL_NOCACHE 0x00000400
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#define GLR_TRYFAILED 13
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static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
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{
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struct gfs2_holder *gh;
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struct pid *pid;
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/* Look in glock's list of holders for one with current task as owner */
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spin_lock(&gl->gl_spin);
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pid = task_pid(current);
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list_for_each_entry(gh, &gl->gl_holders, gh_list) {
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if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
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break;
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if (gh->gh_owner_pid == pid)
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goto out;
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}
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gh = NULL;
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out:
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spin_unlock(&gl->gl_spin);
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return gh;
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}
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static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
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{
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return gl->gl_state == LM_ST_EXCLUSIVE;
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}
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static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
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{
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return gl->gl_state == LM_ST_DEFERRED;
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}
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static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
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{
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return gl->gl_state == LM_ST_SHARED;
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}
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static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
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{
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int ret;
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spin_lock(&gl->gl_spin);
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ret = test_bit(GLF_DEMOTE, &gl->gl_flags);
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spin_unlock(&gl->gl_spin);
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return ret;
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}
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int gfs2_glock_get(struct gfs2_sbd *sdp,
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u64 number, const struct gfs2_glock_operations *glops,
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int create, struct gfs2_glock **glp);
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int gfs2_glock_put(struct gfs2_glock *gl);
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void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
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struct gfs2_holder *gh);
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void gfs2_holder_reinit(unsigned int state, unsigned flags,
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struct gfs2_holder *gh);
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void gfs2_holder_uninit(struct gfs2_holder *gh);
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int gfs2_glock_nq(struct gfs2_holder *gh);
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int gfs2_glock_poll(struct gfs2_holder *gh);
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int gfs2_glock_wait(struct gfs2_holder *gh);
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void gfs2_glock_dq(struct gfs2_holder *gh);
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void gfs2_glock_dq_wait(struct gfs2_holder *gh);
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void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
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int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
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u64 number, const struct gfs2_glock_operations *glops,
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unsigned int state, int flags, struct gfs2_holder *gh);
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int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
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void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
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void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
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void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...);
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/**
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* gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
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* @gl: the glock
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* @state: the state we're requesting
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* @flags: the modifier flags
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* @gh: the holder structure
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*
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* Returns: 0, GLR_*, or errno
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*/
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static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
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unsigned int state, int flags,
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struct gfs2_holder *gh)
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{
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int error;
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gfs2_holder_init(gl, state, flags, gh);
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error = gfs2_glock_nq(gh);
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if (error)
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gfs2_holder_uninit(gh);
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return error;
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}
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/* Lock Value Block functions */
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int gfs2_lvb_hold(struct gfs2_glock *gl);
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void gfs2_lvb_unhold(struct gfs2_glock *gl);
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void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
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void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
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void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
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void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
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void gfs2_glock_finish_truncate(struct gfs2_inode *ip);
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void gfs2_glock_thaw(struct gfs2_sbd *sdp);
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int __init gfs2_glock_init(void);
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void gfs2_glock_exit(void);
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int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
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void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
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int gfs2_register_debugfs(void);
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void gfs2_unregister_debugfs(void);
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extern const struct lm_lockops gfs2_dlm_ops;
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#endif /* __GLOCK_DOT_H__ */
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