fs: dlm: store lkb distributed flags into own value

This patch stores lkb distributed flags value in an separate value
instead of sharing internal and distributed flags in lkb->lkb_flags value.
This has the advantage to not mask/write back flag values in
receive_flags() functionality. The dlm debug_fs does not provide the
distributed flags anymore, those can be added in future.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

7 files changed, 27 insertions, 32 deletions

diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
index 39805aea33367..28b7b5288bd45 100644
--- a/fs/dlm/ast.c
+++ b/fs/dlm/ast.c
@@ -139,7 +139,7 @@ void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,
 	struct dlm_ls *ls = lkb->lkb_resource->res_ls;
 	int rv;
 
-	if (lkb->lkb_flags & DLM_IFL_USER) {
+	if (lkb->lkb_dflags & DLM_DFL_USER) {
 		dlm_user_add_ast(lkb, flags, mode, status, sbflags);
 		return;
 	}
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 8a0e1b1f74ada..65cfb58eaa6b1 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -170,7 +170,7 @@ static void print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
 	u64 xid = 0;
 	u64 us;
 
-	if (lkb->lkb_flags & DLM_IFL_USER) {
+	if (lkb->lkb_dflags & DLM_DFL_USER) {
 		if (lkb->lkb_ua)
 			xid = lkb->lkb_ua->xid;
 	}
@@ -230,7 +230,7 @@ static void print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
 {
 	u64 xid = 0;
 
-	if (lkb->lkb_flags & DLM_IFL_USER) {
+	if (lkb->lkb_dflags & DLM_DFL_USER) {
 		if (lkb->lkb_ua)
 			xid = lkb->lkb_ua->xid;
 	}
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index 3bdb2f4e132ea..748bb483da1c2 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -206,16 +206,10 @@ struct dlm_args {
 
 #define DLM_IFL_CB_PENDING_BIT	0
 
-/* least significant 2 bytes are message changed, they are full transmitted
- * but at receive side only the 2 bytes LSB will be set.
- *
- * Even wireshark dlm dissector does only evaluate the lower bytes and note
- * that they may not be used on transceiver side, we assume the higher bytes
- * are for internal use or reserved so long they are not parsed on receiver
- * side.
- */
-#define DLM_IFL_USER		0x00000001
-#define DLM_IFL_ORPHAN		0x00000002
+/* lkb_dflags */
+
+#define DLM_DFL_USER		0x00000001
+#define DLM_DFL_ORPHAN		0x00000002
 
 #define DLM_CB_CAST		0x00000001
 #define DLM_CB_BAST		0x00000002
@@ -240,6 +234,7 @@ struct dlm_lkb {
 	uint32_t		lkb_exflags;	/* external flags from caller */
 	uint32_t		lkb_sbflags;	/* lksb flags */
 	uint32_t		lkb_flags;	/* internal flags */
+	uint32_t		lkb_dflags;	/* distributed flags */
 	unsigned long		lkb_iflags;	/* internal flags */
 	uint32_t		lkb_lvbseq;	/* lvb sequence number */
 
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 74dd297e08571..21c7abd7ef77b 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -3675,8 +3675,7 @@ static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms)
 {
 	lkb->lkb_exflags = le32_to_cpu(ms->m_exflags);
 	lkb->lkb_sbflags = le32_to_cpu(ms->m_sbflags);
-	lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |
-			  (le32_to_cpu(ms->m_flags) & 0x0000FFFF);
+	lkb->lkb_dflags = le32_to_cpu(ms->m_flags);
 }
 
 static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms,
@@ -3686,8 +3685,7 @@ static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms,
 		return;
 
 	lkb->lkb_sbflags = le32_to_cpu(ms->m_sbflags);
-	lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |
-			 (le32_to_cpu(ms->m_flags) & 0x0000FFFF);
+	lkb->lkb_dflags = le32_to_cpu(ms->m_flags);
 }
 
 static int receive_extralen(struct dlm_message *ms)
@@ -3788,8 +3786,8 @@ static int validate_message(struct dlm_lkb *lkb, struct dlm_message *ms)
 	int error = 0;
 
 	/* currently mixing of user/kernel locks are not supported */
-	if (ms->m_flags & cpu_to_le32(DLM_IFL_USER) &&
-	    ~lkb->lkb_flags & DLM_IFL_USER) {
+	if (ms->m_flags & cpu_to_le32(DLM_DFL_USER) &&
+	    ~lkb->lkb_dflags & DLM_DFL_USER) {
 		log_error(lkb->lkb_resource->res_ls,
 			  "got user dlm message for a kernel lock");
 		error = -EINVAL;
@@ -5347,7 +5345,7 @@ static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 	lkb->lkb_ownpid = le32_to_cpu(rl->rl_ownpid);
 	lkb->lkb_remid = le32_to_cpu(rl->rl_lkid);
 	lkb->lkb_exflags = le32_to_cpu(rl->rl_exflags);
-	lkb->lkb_flags = le32_to_cpu(rl->rl_flags) & 0x0000FFFF;
+	lkb->lkb_dflags = le32_to_cpu(rl->rl_flags);
 	lkb->lkb_flags |= DLM_IFL_MSTCPY;
 	lkb->lkb_lvbseq = le32_to_cpu(rl->rl_lvbseq);
 	lkb->lkb_rqmode = rl->rl_rqmode;
@@ -5573,9 +5571,9 @@ int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua,
 	}
 
 	/* After ua is attached to lkb it will be freed by dlm_free_lkb().
-	   When DLM_IFL_USER is set, the dlm knows that this is a userspace
+	   When DLM_DFL_USER is set, the dlm knows that this is a userspace
 	   lock and that lkb_astparam is the dlm_user_args structure. */
-	lkb->lkb_flags |= DLM_IFL_USER;
+	lkb->lkb_dflags |= DLM_DFL_USER;
 	error = request_lock(ls, lkb, name, namelen, &args);
 
 	switch (error) {
@@ -5690,7 +5688,7 @@ int dlm_user_adopt_orphan(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
 
 		lkb = iter;
 		list_del_init(&iter->lkb_ownqueue);
-		iter->lkb_flags &= ~DLM_IFL_ORPHAN;
+		iter->lkb_dflags &= ~DLM_DFL_ORPHAN;
 		*lkid = iter->lkb_id;
 		break;
 	}
@@ -5934,7 +5932,7 @@ static struct dlm_lkb *del_proc_lock(struct dlm_ls *ls,
 	list_del_init(&lkb->lkb_ownqueue);
 
 	if (lkb->lkb_exflags & DLM_LKF_PERSISTENT)
-		lkb->lkb_flags |= DLM_IFL_ORPHAN;
+		lkb->lkb_dflags |= DLM_DFL_ORPHAN;
 	else
 		lkb->lkb_flags |= DLM_IFL_DEAD;
  out:
@@ -6085,7 +6083,7 @@ int dlm_user_purge(struct dlm_ls *ls, struct dlm_user_proc *proc,
 
 /* debug functionality */
 int dlm_debug_add_lkb(struct dlm_ls *ls, uint32_t lkb_id, char *name, int len,
-		      int lkb_nodeid, unsigned int lkb_flags, int lkb_status)
+		      int lkb_nodeid, unsigned int lkb_dflags, int lkb_status)
 {
 	struct dlm_lksb *lksb;
 	struct dlm_lkb *lkb;
@@ -6093,7 +6091,7 @@ int dlm_debug_add_lkb(struct dlm_ls *ls, uint32_t lkb_id, char *name, int len,
 	int error;
 
 	/* we currently can't set a valid user lock */
-	if (lkb_flags & DLM_IFL_USER)
+	if (lkb_dflags & DLM_DFL_USER)
 		return -EOPNOTSUPP;
 
 	lksb = kzalloc(sizeof(*lksb), GFP_NOFS);
@@ -6106,11 +6104,11 @@ int dlm_debug_add_lkb(struct dlm_ls *ls, uint32_t lkb_id, char *name, int len,
 		return error;
 	}
 
-	lkb->lkb_flags = lkb_flags;
+	lkb->lkb_dflags = lkb_dflags;
 	lkb->lkb_nodeid = lkb_nodeid;
 	lkb->lkb_lksb = lksb;
 	/* user specific pointer, just don't have it NULL for kernel locks */
-	if (~lkb_flags & DLM_IFL_USER)
+	if (~lkb_dflags & DLM_DFL_USER)
 		lkb->lkb_astparam = (void *)0xDEADBEEF;
 
 	error = find_rsb(ls, name, len, 0, R_REQUEST, &r);
diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
index cdbaa452fc05a..c1a832e8a72b4 100644
--- a/fs/dlm/memory.c
+++ b/fs/dlm/memory.c
@@ -118,7 +118,7 @@ struct dlm_lkb *dlm_allocate_lkb(struct dlm_ls *ls)
 
 void dlm_free_lkb(struct dlm_lkb *lkb)
 {
-	if (lkb->lkb_flags & DLM_IFL_USER) {
+	if (lkb->lkb_dflags & DLM_DFL_USER) {
 		struct dlm_user_args *ua;
 		ua = lkb->lkb_ua;
 		if (ua) {
diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
index b76d52e2f6bdd..005ee85218c53 100644
--- a/fs/dlm/rcom.c
+++ b/fs/dlm/rcom.c
@@ -415,7 +415,7 @@ static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
 	rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
 	rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
 	rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
-	rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
+	rl->rl_flags = cpu_to_le32(lkb->lkb_dflags);
 	rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
 	rl->rl_rqmode = lkb->lkb_rqmode;
 	rl->rl_grmode = lkb->lkb_grmode;
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 0951ca5754e2a..dd4b9c8f226cc 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -183,7 +183,8 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode,
 	struct dlm_user_proc *proc;
 	int rv;
 
-	if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD))
+	if (lkb->lkb_dflags & DLM_DFL_ORPHAN ||
+	    lkb->lkb_flags & DLM_IFL_DEAD)
 		return;
 
 	ls = lkb->lkb_resource->res_ls;
@@ -195,7 +196,8 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode,
 	   for cases where a completion ast is received for an operation that
 	   began before clear_proc_locks did its cancel/unlock. */
 
-	if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD))
+	if (lkb->lkb_dflags & DLM_DFL_ORPHAN ||
+	    lkb->lkb_flags & DLM_IFL_DEAD)
 		goto out;
 
 	DLM_ASSERT(lkb->lkb_ua, dlm_print_lkb(lkb););