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ocfs2: Add new refcount tree lock resource in dlmglue. 

refcount tree lock resource is used to protect refcount
tree read/write among multiple nodes.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Tao Ma 2009-08-18 11:19:58 +08:00 committed by Joel Becker
parent a433848132
commit 8dec98edfe
4 changed files with 127 additions and 0 deletions
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80
fs/ocfs2/dlmglue.c
View File

@ -53,6 +53,7 @@
#include "super.h"
#include "uptodate.h"
#include "quota.h"
#include "refcounttree.h"
#include "buffer_head_io.h"
@ -110,6 +111,11 @@ static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres);
static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
int new_level);
static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
int blocking);
#define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
/* This aids in debugging situations where a bad LVB might be involved. */
@ -278,6 +284,12 @@ static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = {
.flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB,
};
static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = {
.check_downconvert = ocfs2_check_refcount_downconvert,
.downconvert_worker = ocfs2_refcount_convert_worker,
.flags = 0,
};
static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
{
return lockres->l_type == OCFS2_LOCK_TYPE_META ||
@ -306,6 +318,12 @@ static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_re
return (struct ocfs2_mem_dqinfo *)lockres->l_priv;
}
static inline struct ocfs2_refcount_tree *
ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res)
{
return container_of(res, struct ocfs2_refcount_tree, rf_lockres);
}
static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
{
if (lockres->l_ops->get_osb)
@ -693,6 +711,17 @@ void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
info);
}
void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
struct ocfs2_super *osb, u64 ref_blkno,
unsigned int generation)
{
ocfs2_lock_res_init_once(lockres);
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno,
generation, lockres->l_name);
ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT,
&ocfs2_refcount_block_lops, osb);
}
void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
{
mlog_entry_void();
@ -3648,6 +3677,26 @@ static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
return UNBLOCK_CONTINUE_POST;
}
static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
int new_level)
{
struct ocfs2_refcount_tree *tree =
ocfs2_lock_res_refcount_tree(lockres);
return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level);
}
static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
int blocking)
{
struct ocfs2_refcount_tree *tree =
ocfs2_lock_res_refcount_tree(lockres);
ocfs2_metadata_cache_purge(&tree->rf_ci);
return UNBLOCK_CONTINUE;
}
static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres)
{
struct ocfs2_qinfo_lvb *lvb;
@ -3760,6 +3809,37 @@ bail:
return status;
}
int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex)
{
int status;
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
struct ocfs2_super *osb = lockres->l_priv;
if (ocfs2_is_hard_readonly(osb))
return -EROFS;
if (ocfs2_mount_local(osb))
return 0;
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
if (status < 0)
mlog_errno(status);
return status;
}
void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex)
{
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
struct ocfs2_super *osb = lockres->l_priv;
if (!ocfs2_mount_local(osb))
ocfs2_cluster_unlock(osb, lockres, level);
}
/*
* This is the filesystem locking protocol. It provides the lock handling
* hooks for the underlying DLM. It has a maximum version number.

6
fs/ocfs2/dlmglue.h
View File

@ -101,6 +101,9 @@ void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
struct ocfs2_mem_dqinfo;
void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
struct ocfs2_mem_dqinfo *info);
void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
struct ocfs2_super *osb, u64 ref_blkno,
unsigned int generation);
void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
int ocfs2_create_new_inode_locks(struct inode *inode);
int ocfs2_drop_inode_locks(struct inode *inode);
@ -148,6 +151,9 @@ int ocfs2_file_lock(struct file *file, int ex, int trylock);
void ocfs2_file_unlock(struct file *file);
int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex);
void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex);
struct ocfs2_refcount_tree;
int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex);
void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex);
void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);

5
fs/ocfs2/ocfs2_lockid.h
View File

@ -49,6 +49,7 @@ enum ocfs2_lock_type {
OCFS2_LOCK_TYPE_QINFO,
OCFS2_LOCK_TYPE_NFS_SYNC,
OCFS2_LOCK_TYPE_ORPHAN_SCAN,
OCFS2_LOCK_TYPE_REFCOUNT,
OCFS2_NUM_LOCK_TYPES
};
@ -89,6 +90,9 @@ static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
case OCFS2_LOCK_TYPE_ORPHAN_SCAN:
c = 'P';
break;
case OCFS2_LOCK_TYPE_REFCOUNT:
c = 'T';
break;
default:
c = '\0';
}
@ -110,6 +114,7 @@ static char *ocfs2_lock_type_strings[] = {
[OCFS2_LOCK_TYPE_QINFO] = "Quota",
[OCFS2_LOCK_TYPE_NFS_SYNC] = "NFSSync",
[OCFS2_LOCK_TYPE_ORPHAN_SCAN] = "OrphanScan",
[OCFS2_LOCK_TYPE_REFCOUNT] = "Refcount",
};
static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)

36
fs/ocfs2/refcounttree.h Normal file
View File

@ -0,0 +1,36 @@
/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* refcounttree.h
*
* Copyright (C) 2009 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 version 2 as published by the Free Software Foundation.
*
* 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.
*/
#ifndef OCFS2_REFCOUNTTREE_H
#define OCFS2_REFCOUNTTREE_H
struct ocfs2_refcount_tree {
struct rb_node rf_node;
u64 rf_blkno;
u32 rf_generation;
struct rw_semaphore rf_sem;
struct ocfs2_lock_res rf_lockres;
struct kref rf_getcnt;
int rf_removed;
/* the following 4 fields are used by caching_info. */
struct ocfs2_caching_info rf_ci;
spinlock_t rf_lock;
struct mutex rf_io_mutex;
struct super_block *rf_sb;
};
#endif /* OCFS2_REFCOUNTTREE_H */