dlm: record full callback state
Change how callbacks are recorded for locks. Previously, information
about multiple callbacks was combined into a couple of variables that
indicated what the end result should be. In some situations, we
could not tell from this combined state what the exact sequence of
callbacks were, and would end up either delivering the callbacks in
the wrong order, or suppress redundant callbacks incorrectly. This
new approach records all the data for each callback, leaving no
uncertainty about what needs to be delivered.
Signed-off-by: David Teigland <teigland@redhat.com>
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index f632b58..b942049 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -192,11 +192,6 @@
* lkb is a process copy, the nodeid specifies the lock master.
*/
-/* lkb_ast_type */
-
-#define AST_COMP 1
-#define AST_BAST 2
-
/* lkb_status */
#define DLM_LKSTS_WAITING 1
@@ -217,6 +212,20 @@
#define DLM_IFL_USER 0x00000001
#define DLM_IFL_ORPHAN 0x00000002
+#define DLM_CALLBACKS_SIZE 6
+
+#define DLM_CB_CAST 0x00000001
+#define DLM_CB_BAST 0x00000002
+#define DLM_CB_SKIP 0x00000004
+
+struct dlm_callback {
+ uint64_t seq;
+ uint32_t flags; /* DLM_CBF_ */
+ int sb_status; /* copy to lksb status */
+ uint8_t sb_flags; /* copy to lksb flags */
+ int8_t mode; /* rq mode of bast, gr mode of cast */
+};
+
struct dlm_lkb {
struct dlm_rsb *lkb_resource; /* the rsb */
struct kref lkb_ref;
@@ -236,13 +245,6 @@
int8_t lkb_wait_type; /* type of reply waiting for */
int8_t lkb_wait_count;
- int8_t lkb_ast_type; /* type of ast queued for */
- int8_t lkb_ast_first; /* type of first ast queued */
-
- int8_t lkb_bastmode; /* req mode of queued bast */
- int8_t lkb_castmode; /* gr mode of queued cast */
- int8_t lkb_bastmode_done; /* last delivered bastmode */
- int8_t lkb_castmode_done; /* last delivered castmode */
struct list_head lkb_idtbl_list; /* lockspace lkbtbl */
struct list_head lkb_statequeue; /* rsb g/c/w list */
@@ -251,10 +253,15 @@
struct list_head lkb_astqueue; /* need ast to be sent */
struct list_head lkb_ownqueue; /* list of locks for a process */
struct list_head lkb_time_list;
- ktime_t lkb_time_bast; /* for debugging */
ktime_t lkb_timestamp;
unsigned long lkb_timeout_cs;
+ struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE];
+ struct dlm_callback lkb_last_cast;
+ struct dlm_callback lkb_last_bast;
+ ktime_t lkb_last_cast_time; /* for debugging */
+ ktime_t lkb_last_bast_time; /* for debugging */
+
char *lkb_lvbptr;
struct dlm_lksb *lkb_lksb; /* caller's status block */
void (*lkb_astfn) (void *astparam);
@@ -544,8 +551,6 @@
(dlm_user_proc) on the struct file,
the process's locks point back to it*/
struct dlm_lksb lksb;
- int old_mode;
- int update_user_lvb;
struct dlm_lksb __user *user_lksb;
void __user *castparam;
void __user *castaddr;