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Subject[PATCH 04/18] ocfs2: Create the lock status block union.
Date
Wrap the lock status block (lksb) in a union.  Later we will add a union
element for the fs/dlm lksb. Create accessors for the status and lvb
fields.

Other than a debugging function, dlmglue.c does not directly reference
the o2dlm locking path anymore.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
---
fs/ocfs2/dlmglue.c | 23 +++++++++++++----------
fs/ocfs2/ocfs2.h | 5 +++--
fs/ocfs2/stackglue.c | 29 ++++++++++++++++++++++-------
fs/ocfs2/stackglue.h | 11 +++++++++--
4 files changed, 47 insertions(+), 21 deletions(-)
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 12a5213..0053945 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -112,7 +112,8 @@ static void ocfs2_dump_meta_lvb_info(u64 level,
unsigned int line,
struct ocfs2_lock_res *lockres)
{
- struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
+ struct ocfs2_meta_lvb *lvb =
+ (struct ocfs2_meta_lvb *)ocfs2_dlm_lvb(&lockres->l_lksb);

mlog(level, "LVB information for %s (called from %s:%u):\n",
lockres->l_name, function, line);
@@ -799,14 +800,14 @@ static void ocfs2_blocking_ast(void *opaque, int level)
static void ocfs2_locking_ast(void *opaque)
{
struct ocfs2_lock_res *lockres = opaque;
- struct dlm_lockstatus *lksb = &lockres->l_lksb;
unsigned long flags;

spin_lock_irqsave(&lockres->l_lock, flags);

- if (lksb->status != DLM_NORMAL) {
- mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n",
- lockres->l_name, lksb->status);
+ if (ocfs2_dlm_lock_status(&lockres->l_lksb)) {
+ mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n",
+ lockres->l_name,
+ ocfs2_dlm_lock_status(&lockres->l_lksb));
spin_unlock_irqrestore(&lockres->l_lock, flags);
return;
}
@@ -1634,7 +1635,7 @@ static void __ocfs2_stuff_meta_lvb(struct inode *inode)

mlog_entry_void();

- lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
+ lvb = (struct ocfs2_meta_lvb *)ocfs2_dlm_lvb(&lockres->l_lksb);

/*
* Invalidate the LVB of a deleted inode - this way other
@@ -1686,7 +1687,7 @@ static void ocfs2_refresh_inode_from_lvb(struct inode *inode)

mlog_meta_lvb(0, lockres);

- lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
+ lvb = (struct ocfs2_meta_lvb *)ocfs2_dlm_lvb(&lockres->l_lksb);

/* We're safe here without the lockres lock... */
spin_lock(&oi->ip_lock);
@@ -1721,7 +1722,8 @@ static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
struct ocfs2_lock_res *lockres)
{
- struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
+ struct ocfs2_meta_lvb *lvb =
+ (struct ocfs2_meta_lvb *)ocfs2_dlm_lvb(&lockres->l_lksb);

if (lvb->lvb_version == OCFS2_LVB_VERSION
&& be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
@@ -2379,7 +2381,7 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
lockres->l_blocking);

/* Dump the raw LVB */
- lvb = lockres->l_lksb.lvb;
+ lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
for(i = 0; i < DLM_LVB_LEN; i++)
seq_printf(m, "0x%x\t", lvb[i]);

@@ -2692,7 +2694,8 @@ static int ocfs2_drop_lock(struct ocfs2_super *osb,
if (ret) {
ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
- dlm_print_one_lock(lockres->l_lksb.lockid);
+ /* XXX Need to abstract this */
+ dlm_print_one_lock(lockres->l_lksb.lksb_o2dlm.lockid);
BUG();
}
mlog(0, "lock %s, successfull return from ocfs2_dlm_unlock\n",
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index f78e9ed..6d7c6d2 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -40,7 +40,8 @@
#include "cluster/heartbeat.h"
#include "cluster/tcp.h"

-#include "dlm/dlmapi.h"
+/* For union ocfs2_dlm_lksb */
+#include "stackglue.h"

#include "ocfs2_fs.h"
#include "ocfs2_lockid.h"
@@ -120,7 +121,7 @@ struct ocfs2_lock_res {
int l_level;
unsigned int l_ro_holders;
unsigned int l_ex_holders;
- struct dlm_lockstatus l_lksb;
+ union ocfs2_dlm_lksb l_lksb;

/* used from AST/BAST funcs. */
enum ocfs2_ast_action l_action;
diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
index 0aec2fc..eb88854 100644
--- a/fs/ocfs2/stackglue.c
+++ b/fs/ocfs2/stackglue.c
@@ -199,7 +199,7 @@ static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)

int ocfs2_dlm_lock(struct dlm_ctxt *dlm,
int mode,
- struct dlm_lockstatus *lksb,
+ union ocfs2_dlm_lksb *lksb,
u32 flags,
void *name,
unsigned int namelen,
@@ -212,15 +212,16 @@ int ocfs2_dlm_lock(struct dlm_ctxt *dlm,

BUG_ON(lproto == NULL);

- status = dlmlock(dlm, o2dlm_mode, lksb, o2dlm_flags, name, namelen,
- o2dlm_lock_ast_wrapper, astarg,
- o2dlm_blocking_ast_wrapper);
+ status = dlmlock(dlm, o2dlm_mode, &lksb->lksb_o2dlm, o2dlm_flags,
+ name, namelen,
+ o2dlm_lock_ast_wrapper, astarg,
+ o2dlm_blocking_ast_wrapper);
ret = dlm_status_to_errno(status);
return ret;
}

int ocfs2_dlm_unlock(struct dlm_ctxt *dlm,
- struct dlm_lockstatus *lksb,
+ union ocfs2_dlm_lksb *lksb,
u32 flags,
void *astarg)
{
@@ -230,12 +231,26 @@ int ocfs2_dlm_unlock(struct dlm_ctxt *dlm,

BUG_ON(lproto == NULL);

- status = dlmunlock(dlm, lksb, o2dlm_flags,
- o2dlm_unlock_ast_wrapper, astarg);
+ status = dlmunlock(dlm, &lksb->lksb_o2dlm, o2dlm_flags,
+ o2dlm_unlock_ast_wrapper, astarg);
ret = dlm_status_to_errno(status);
return ret;
}

+int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb)
+{
+ return dlm_status_to_errno(lksb->lksb_o2dlm.status);
+}
+
+/*
+ * Why don't we cast to ocfs2_meta_lvb? The "clean" answer is that we
+ * don't cast at the glue level. The real answer is that the header
+ * ordering is nigh impossible.
+ */
+void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb)
+{
+ return (void *)(lksb->lksb_o2dlm.lvb);
+}

void o2cb_get_stack(struct ocfs2_locking_protocol *proto)
{
diff --git a/fs/ocfs2/stackglue.h b/fs/ocfs2/stackglue.h
index 8ebcfba..3c91e24 100644
--- a/fs/ocfs2/stackglue.h
+++ b/fs/ocfs2/stackglue.h
@@ -40,18 +40,25 @@ struct ocfs2_locking_protocol {
void (*lp_unlock_ast)(void *astarg, int error);
};

+union ocfs2_dlm_lksb {
+ struct dlm_lockstatus lksb_o2dlm;
+};
+
int ocfs2_dlm_lock(struct dlm_ctxt *dlm,
int mode,
- struct dlm_lockstatus *lksb,
+ union ocfs2_dlm_lksb *lksb,
u32 flags,
void *name,
unsigned int namelen,
void *astarg);
int ocfs2_dlm_unlock(struct dlm_ctxt *dlm,
- struct dlm_lockstatus *lksb,
+ union ocfs2_dlm_lksb *lksb,
u32 flags,
void *astarg);

+int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb);
+void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb);
+
void o2cb_get_stack(struct ocfs2_locking_protocol *proto);
void o2cb_put_stack(void);

--
1.5.3.8


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