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ocfs2: Remove data locks

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The meta lock now covers both meta data and data, so this just removes the
now-redundant data lock.

Combining locks saves us a round of lock mastery per inode and one less lock
to ping between nodes during read/write.

We don't lose much - since meta locks were always held before a data lock
(and at the same level) ordered writeout mode (the default) ensured that
flushing for the meta data lock also pushed out data anyways.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh
2007-10-18 15:23:46 -07:00
parent f1f540688e
commit c934a92d05
9 changed files with 22 additions and 214 deletions
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104
fs/ocfs2/dlmglue.c
View File

@@ -232,12 +232,6 @@ static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
};
static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
.get_osb = ocfs2_get_inode_osb,
.downconvert_worker = ocfs2_data_convert_worker,
.flags = 0,
};
static struct ocfs2_lock_res_ops ocfs2_super_lops = {
.flags = LOCK_TYPE_REQUIRES_REFRESH,
};
@@ -261,7 +255,6 @@ static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = {
static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
{
return lockres->l_type == OCFS2_LOCK_TYPE_META ||
lockres->l_type == OCFS2_LOCK_TYPE_DATA ||
lockres->l_type == OCFS2_LOCK_TYPE_RW ||
lockres->l_type == OCFS2_LOCK_TYPE_OPEN;
}
@@ -405,9 +398,6 @@ void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
case OCFS2_LOCK_TYPE_META:
ops = &ocfs2_inode_meta_lops;
break;
case OCFS2_LOCK_TYPE_DATA:
ops = &ocfs2_inode_data_lops;
break;
case OCFS2_LOCK_TYPE_OPEN:
ops = &ocfs2_inode_open_lops;
break;
@@ -1154,12 +1144,6 @@ int ocfs2_create_new_inode_locks(struct inode *inode)
goto bail;
}
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1);
if (ret) {
mlog_errno(ret);
goto bail;
}
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0);
if (ret) {
mlog_errno(ret);
@@ -1312,67 +1296,6 @@ out:
mlog_exit_void();
}
int ocfs2_data_lock_full(struct inode *inode,
int write,
int arg_flags)
{
int status = 0, level;
struct ocfs2_lock_res *lockres;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
BUG_ON(!inode);
mlog_entry_void();
mlog(0, "inode %llu take %s DATA lock\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
write ? "EXMODE" : "PRMODE");
/* We'll allow faking a readonly data lock for
* rodevices. */
if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) {
if (write) {
status = -EROFS;
mlog_errno(status);
}
goto out;
}
if (ocfs2_mount_local(osb))
goto out;
lockres = &OCFS2_I(inode)->ip_data_lockres;
level = write ? LKM_EXMODE : LKM_PRMODE;
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level,
0, arg_flags);
if (status < 0 && status != -EAGAIN)
mlog_errno(status);
out:
mlog_exit(status);
return status;
}
/* see ocfs2_meta_lock_with_page() */
int ocfs2_data_lock_with_page(struct inode *inode,
int write,
struct page *page)
{
int ret;
ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK);
if (ret == -EAGAIN) {
unlock_page(page);
if (ocfs2_data_lock(inode, write) == 0)
ocfs2_data_unlock(inode, write);
ret = AOP_TRUNCATED_PAGE;
}
return ret;
}
static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres)
{
@@ -1404,26 +1327,6 @@ static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
mlog_exit_void();
}
void ocfs2_data_unlock(struct inode *inode,
int write)
{
int level = write ? LKM_EXMODE : LKM_PRMODE;
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog_entry_void();
mlog(0, "inode %llu drop %s DATA lock\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
write ? "EXMODE" : "PRMODE");
if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
!ocfs2_mount_local(osb))
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
mlog_exit_void();
}
#define OCFS2_SEC_BITS 34
#define OCFS2_SEC_SHIFT (64 - 34)
#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
@@ -2591,13 +2494,6 @@ int ocfs2_drop_inode_locks(struct inode *inode)
status = err;
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
&OCFS2_I(inode)->ip_data_lockres);
if (err < 0)
mlog_errno(err);
if (err < 0 && !status)
status = err;
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
&OCFS2_I(inode)->ip_meta_lockres);
if (err < 0)