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dlm: use workqueue for callbacks

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Instead of creating our own kthread (dlm_astd) to deliver
callbacks for all lockspaces, use a per-lockspace workqueue
to deliver the callbacks.  This eliminates complications and
slowdowns from many lockspaces sharing the same thread.

Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
David Teigland
2011-04-05 13:16:24 -05:00
parent 883ba74f43
commit 23e8e1aaac
7 changed files with 185 additions and 218 deletions
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43
fs/dlm/lockspace.c
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@@ -15,7 +15,6 @@
#include "lockspace.h"
#include "member.h"
#include "recoverd.h"
#include "ast.h"
#include "dir.h"
#include "lowcomms.h"
#include "config.h"
@@ -24,6 +23,7 @@
#include "recover.h"
#include "requestqueue.h"
#include "user.h"
#include "ast.h"
static int ls_count;
static struct mutex ls_lock;
@@ -359,17 +359,10 @@ static int threads_start(void)
{
int error;
/* Thread which process lock requests for all lockspace's */
error = dlm_astd_start();
if (error) {
log_print("cannot start dlm_astd thread %d", error);
goto fail;
}
error = dlm_scand_start();
if (error) {
log_print("cannot start dlm_scand thread %d", error);
goto astd_fail;
goto fail;
}
/* Thread for sending/receiving messages for all lockspace's */
@@ -383,8 +376,6 @@ static int threads_start(void)
scand_fail:
dlm_scand_stop();
astd_fail:
dlm_astd_stop();
fail:
return error;
}
@@ -393,7 +384,6 @@ static void threads_stop(void)
{
dlm_scand_stop();
dlm_lowcomms_stop();
dlm_astd_stop();
}
static int new_lockspace(const char *name, int namelen, void **lockspace,
@@ -514,6 +504,9 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
init_completion(&ls->ls_members_done);
ls->ls_members_result = -1;
mutex_init(&ls->ls_cb_mutex);
INIT_LIST_HEAD(&ls->ls_cb_delay);
ls->ls_recoverd_task = NULL;
mutex_init(&ls->ls_recoverd_active);
spin_lock_init(&ls->ls_recover_lock);
@@ -547,18 +540,26 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
list_add(&ls->ls_list, &lslist);
spin_unlock(&lslist_lock);
if (flags & DLM_LSFL_FS) {
error = dlm_callback_start(ls);
if (error) {
log_error(ls, "can't start dlm_callback %d", error);
goto out_delist;
}
}
/* needs to find ls in lslist */
error = dlm_recoverd_start(ls);
if (error) {
log_error(ls, "can't start dlm_recoverd %d", error);
goto out_delist;
goto out_callback;
}
ls->ls_kobj.kset = dlm_kset;
error = kobject_init_and_add(&ls->ls_kobj, &dlm_ktype, NULL,
"%s", ls->ls_name);
if (error)
goto out_stop;
goto out_recoverd;
kobject_uevent(&ls->ls_kobj, KOBJ_ADD);
/* let kobject handle freeing of ls if there's an error */
@@ -572,7 +573,7 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
error = do_uevent(ls, 1);
if (error)
goto out_stop;
goto out_recoverd;
wait_for_completion(&ls->ls_members_done);
error = ls->ls_members_result;
@@ -589,8 +590,10 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
do_uevent(ls, 0);
dlm_clear_members(ls);
kfree(ls->ls_node_array);
out_stop:
out_recoverd:
dlm_recoverd_stop(ls);
out_callback:
dlm_callback_stop(ls);
out_delist:
spin_lock(&lslist_lock);
list_del(&ls->ls_list);
@@ -652,8 +655,6 @@ static int lkb_idr_free(int id, void *p, void *data)
{
struct dlm_lkb *lkb = p;
dlm_del_ast(lkb);
if (lkb->lkb_lvbptr && lkb->lkb_flags & DLM_IFL_MSTCPY)
dlm_free_lvb(lkb->lkb_lvbptr);
@@ -717,12 +718,12 @@ static int release_lockspace(struct dlm_ls *ls, int force)
dlm_recoverd_stop(ls);
dlm_callback_stop(ls);
remove_lockspace(ls);
dlm_delete_debug_file(ls);
dlm_astd_suspend();
kfree(ls->ls_recover_buf);
/*
@@ -740,8 +741,6 @@ static int release_lockspace(struct dlm_ls *ls, int force)
idr_remove_all(&ls->ls_lkbidr);
idr_destroy(&ls->ls_lkbidr);
dlm_astd_resume();
/*
* Free all rsb's on rsbtbl[] lists
*/