[Ocfs2-devel] [PATCH 24/42] ocfs2: Add new refcount tree lock resource.
Tao Ma
tao.ma at oracle.com
Thu Mar 26 16:02:30 PDT 2009
refcount tree lock resource is used to protect refcount
tree read/write among multiple nodes.
Signed-off-by: Tao Ma <tao.ma at oracle.com>
---
fs/ocfs2/dlmglue.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++
fs/ocfs2/dlmglue.h | 4 +++
fs/ocfs2/ocfs2_lockid.h | 5 +++
fs/ocfs2/refcounttree.h | 14 +++++++++
4 files changed, 91 insertions(+), 0 deletions(-)
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 68cb674..cc0a65e 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -53,6 +53,7 @@
#include "super.h"
#include "uptodate.h"
#include "quota.h"
+#include "refcounttree.h"
#include "buffer_head_io.h"
@@ -107,6 +108,11 @@ 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. */
@@ -267,6 +273,12 @@ 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 ||
@@ -648,6 +660,16 @@ 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)
+{
+ ocfs2_lock_res_init_once(lockres);
+ ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno,
+ 0, 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();
@@ -3495,6 +3517,24 @@ 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_REF_ITEM(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_REF_ITEM(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;
@@ -3606,6 +3646,34 @@ bail:
return status;
}
+int ocfs2_refcount_lock(struct ocfs2_lock_res *lockres, int ex)
+{
+ int status;
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+ 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_lock_res *lockres, int ex)
+{
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+ 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.
diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
index 3f8d998..20fe528 100644
--- a/fs/ocfs2/dlmglue.h
+++ b/fs/ocfs2/dlmglue.h
@@ -85,6 +85,8 @@ 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);
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);
@@ -121,6 +123,8 @@ 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);
+int ocfs2_refcount_lock(struct ocfs2_lock_res *lockres, int ex);
+void ocfs2_refcount_unlock(struct ocfs2_lock_res *lockres, int ex);
void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
diff --git a/fs/ocfs2/ocfs2_lockid.h b/fs/ocfs2/ocfs2_lockid.h
index eb6f50c..aafed05 100644
--- a/fs/ocfs2/ocfs2_lockid.h
+++ b/fs/ocfs2/ocfs2_lockid.h
@@ -47,6 +47,7 @@ enum ocfs2_lock_type {
OCFS2_LOCK_TYPE_OPEN,
OCFS2_LOCK_TYPE_FLOCK,
OCFS2_LOCK_TYPE_QINFO,
+ OCFS2_LOCK_TYPE_REFCOUNT,
OCFS2_NUM_LOCK_TYPES
};
@@ -81,6 +82,9 @@ static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
case OCFS2_LOCK_TYPE_QINFO:
c = 'Q';
break;
+ case OCFS2_LOCK_TYPE_REFCOUNT:
+ c = 'T';
+ break;
default:
c = '\0';
}
@@ -100,6 +104,7 @@ static char *ocfs2_lock_type_strings[] = {
[OCFS2_LOCK_TYPE_OPEN] = "Open",
[OCFS2_LOCK_TYPE_FLOCK] = "Flock",
[OCFS2_LOCK_TYPE_QINFO] = "Quota",
+ [OCFS2_LOCK_TYPE_REFCOUNT] = "Refcount",
};
static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
diff --git a/fs/ocfs2/refcounttree.h b/fs/ocfs2/refcounttree.h
index d38f996..0364989 100644
--- a/fs/ocfs2/refcounttree.h
+++ b/fs/ocfs2/refcounttree.h
@@ -17,6 +17,20 @@
#ifndef OCFS2_REFCOUNTTREE_H
#define OCFS2_REFCOUNTTREE_H
+struct ocfs2_refcount_tree {
+ struct rb_node rf_node;
+ u64 rf_blkno;
+ struct rw_semaphore rf_sem;
+ struct ocfs2_lock_res rf_lockres;
+ struct ocfs2_caching_info rf_ci;
+};
+
+static inline struct ocfs2_refcount_tree *
+OCFS2_REF_ITEM(struct ocfs2_lock_res *res)
+{
+ return container_of(res, struct ocfs2_refcount_tree, rf_lockres);
+}
+
int ocfs2_create_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
int ocfs2_set_refcount_tree(struct inode *inode,
struct buffer_head *di_bh,
--
1.6.2.rc2.16.gf474c
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