[DLM] add lock timeouts and warnings [2/6]
New features: lock timeouts and time warnings. If the DLM_LKF_TIMEOUT
flag is set, then the request/conversion will be canceled after waiting
the specified number of centiseconds (specified per lock). This feature
is only available for locks requested through libdlm (can be enabled for
kernel dlm users if there's a use for it.)
If the new DLM_LSFL_TIMEWARN flag is set when creating the lockspace, then
a warning message will be sent to userspace (using genetlink) after a
request/conversion has been waiting for a given number of centiseconds
(configurable per node). The time warnings will be used in the future
to do deadlock detection in userspace.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index 30994d6..65a5fc0 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -213,8 +213,10 @@
#define DLM_IFL_OVERLAP_UNLOCK 0x00080000
#define DLM_IFL_OVERLAP_CANCEL 0x00100000
#define DLM_IFL_ENDOFLIFE 0x00200000
+#define DLM_IFL_WATCH_TIMEWARN 0x00400000
#define DLM_IFL_USER 0x00000001
#define DLM_IFL_ORPHAN 0x00000002
+#define DLM_IFL_TIMEOUT_CANCEL 0x00000004
struct dlm_lkb {
struct dlm_rsb *lkb_resource; /* the rsb */
@@ -243,6 +245,9 @@
struct list_head lkb_wait_reply; /* waiting for remote reply */
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;
+ unsigned long lkb_timestamp;
+ unsigned long lkb_timeout_cs;
char *lkb_lvbptr;
struct dlm_lksb *lkb_lksb; /* caller's status block */
@@ -447,6 +452,9 @@
struct mutex ls_orphans_mutex;
struct list_head ls_orphans;
+ struct mutex ls_timeout_mutex;
+ struct list_head ls_timeout;
+
struct list_head ls_nodes; /* current nodes in ls */
struct list_head ls_nodes_gone; /* dead node list, recovery */
int ls_num_nodes; /* number of nodes in ls */
@@ -472,6 +480,7 @@
struct task_struct *ls_recoverd_task;
struct mutex ls_recoverd_active;
spinlock_t ls_recover_lock;
+ unsigned long ls_recover_begin; /* jiffies timestamp */
uint32_t ls_recover_status; /* DLM_RS_ */
uint64_t ls_recover_seq;
struct dlm_recover *ls_recover_args;
@@ -501,6 +510,7 @@
#define LSFL_RCOM_READY 3
#define LSFL_RCOM_WAIT 4
#define LSFL_UEVENT_WAIT 5
+#define LSFL_TIMEWARN 6
/* much of this is just saving user space pointers associated with the
lock that we pass back to the user lib with an ast */