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dlm: implement LSFL_SOFTIRQ_SAFE

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When a lockspace user allows it, run callback functions directly from
softirq context, instead of queueing callbacks to be run from the
dlm_callback workqueue context.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2024-06-03 17:55:56 -04:00 committed by David Teigland
parent f328a26eeb
commit 68bde2a67a
5 changed files with 125 additions and 83 deletions
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145
fs/dlm/ast.c
View File

@ -18,35 +18,52 @@
#include "user.h"
#include "ast.h"
static void dlm_run_callback(uint32_t ls_id, uint32_t lkb_id, int8_t mode,
uint32_t flags, uint8_t sb_flags, int sb_status,
struct dlm_lksb *lksb,
void (*astfn)(void *astparam),
void (*bastfn)(void *astparam, int mode),
void *astparam, const char *res_name,
size_t res_length)
{
if (flags & DLM_CB_BAST) {
trace_dlm_bast(ls_id, lkb_id, mode, res_name, res_length);
bastfn(astparam, mode);
} else if (flags & DLM_CB_CAST) {
trace_dlm_ast(ls_id, lkb_id, sb_status, sb_flags, res_name,
res_length);
lksb->sb_status = sb_status;
lksb->sb_flags = sb_flags;
astfn(astparam);
}
}
static void dlm_do_callback(struct dlm_callback *cb)
{
dlm_run_callback(cb->ls_id, cb->lkb_id, cb->mode, cb->flags,
cb->sb_flags, cb->sb_status, cb->lkb_lksb,
cb->astfn, cb->bastfn, cb->astparam,
cb->res_name, cb->res_length);
dlm_free_cb(cb);
}
static void dlm_callback_work(struct work_struct *work)
{
struct dlm_callback *cb = container_of(work, struct dlm_callback, work);
if (cb->flags & DLM_CB_BAST) {
trace_dlm_bast(cb->ls_id, cb->lkb_id, cb->mode, cb->res_name,
cb->res_length);
cb->bastfn(cb->astparam, cb->mode);
} else if (cb->flags & DLM_CB_CAST) {
trace_dlm_ast(cb->ls_id, cb->lkb_id, cb->sb_status,
cb->sb_flags, cb->res_name, cb->res_length);
cb->lkb_lksb->sb_status = cb->sb_status;
cb->lkb_lksb->sb_flags = cb->sb_flags;
cb->astfn(cb->astparam);
}
dlm_free_cb(cb);
dlm_do_callback(cb);
}
int dlm_queue_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
int status, uint32_t sbflags,
struct dlm_callback **cb)
bool dlm_may_skip_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
int status, uint32_t sbflags, int *copy_lvb)
{
struct dlm_rsb *rsb = lkb->lkb_resource;
int rv = DLM_ENQUEUE_CALLBACK_SUCCESS;
struct dlm_ls *ls = rsb->res_ls;
int copy_lvb = 0;
int prev_mode;
if (copy_lvb)
*copy_lvb = 0;
if (flags & DLM_CB_BAST) {
/* if cb is a bast, it should be skipped if the blocking mode is
* compatible with the last granted mode
@ -56,7 +73,7 @@ int dlm_queue_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
log_debug(ls, "skip %x bast mode %d for cast mode %d",
lkb->lkb_id, mode,
lkb->lkb_last_cast_cb_mode);
goto out;
return true;
}
}
@ -74,7 +91,7 @@ int dlm_queue_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
(prev_mode > mode && prev_mode > DLM_LOCK_PR)) {
log_debug(ls, "skip %x add bast mode %d for bast mode %d",
lkb->lkb_id, mode, prev_mode);
goto out;
return true;
}
}
@ -85,8 +102,10 @@ int dlm_queue_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
prev_mode = lkb->lkb_last_cast_cb_mode;
if (!status && lkb->lkb_lksb->sb_lvbptr &&
dlm_lvb_operations[prev_mode + 1][mode + 1])
copy_lvb = 1;
dlm_lvb_operations[prev_mode + 1][mode + 1]) {
if (copy_lvb)
*copy_lvb = 1;
}
}
lkb->lkb_last_cast_cb_mode = mode;
@ -96,11 +115,19 @@ int dlm_queue_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
lkb->lkb_last_cb_mode = mode;
lkb->lkb_last_cb_flags = flags;
return false;
}
int dlm_get_cb(struct dlm_lkb *lkb, uint32_t flags, int mode,
int status, uint32_t sbflags,
struct dlm_callback **cb)
{
struct dlm_rsb *rsb = lkb->lkb_resource;
struct dlm_ls *ls = rsb->res_ls;
*cb = dlm_allocate_cb();
if (!*cb) {
rv = DLM_ENQUEUE_CALLBACK_FAILURE;
goto out;
}
if (WARN_ON_ONCE(!*cb))
return -ENOMEM;
/* for tracing */
(*cb)->lkb_id = lkb->lkb_id;
@ -112,19 +139,34 @@ int dlm_queue_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
(*cb)->mode = mode;
(*cb)->sb_status = status;
(*cb)->sb_flags = (sbflags & 0x000000FF);
(*cb)->copy_lvb = copy_lvb;
(*cb)->lkb_lksb = lkb->lkb_lksb;
rv = DLM_ENQUEUE_CALLBACK_NEED_SCHED;
return 0;
}
out:
static int dlm_get_queue_cb(struct dlm_lkb *lkb, uint32_t flags, int mode,
int status, uint32_t sbflags,
struct dlm_callback **cb)
{
int rv;
rv = dlm_get_cb(lkb, flags, mode, status, sbflags, cb);
if (rv)
return rv;
(*cb)->astfn = lkb->lkb_astfn;
(*cb)->bastfn = lkb->lkb_bastfn;
(*cb)->astparam = lkb->lkb_astparam;
INIT_WORK(&(*cb)->work, dlm_callback_work);
return 0;
}
void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,
uint32_t sbflags)
{
struct dlm_ls *ls = lkb->lkb_resource->res_ls;
struct dlm_rsb *rsb = lkb->lkb_resource;
struct dlm_ls *ls = rsb->res_ls;
struct dlm_callback *cb;
int rv;
@ -133,35 +175,34 @@ void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,
return;
}
rv = dlm_queue_lkb_callback(lkb, flags, mode, status, sbflags,
&cb);
switch (rv) {
case DLM_ENQUEUE_CALLBACK_NEED_SCHED:
cb->astfn = lkb->lkb_astfn;
cb->bastfn = lkb->lkb_bastfn;
cb->astparam = lkb->lkb_astparam;
INIT_WORK(&cb->work, dlm_callback_work);
if (dlm_may_skip_callback(lkb, flags, mode, status, sbflags, NULL))
return;
spin_lock_bh(&ls->ls_cb_lock);
if (test_bit(LSFL_CB_DELAY, &ls->ls_flags))
if (test_bit(LSFL_CB_DELAY, &ls->ls_flags)) {
rv = dlm_get_queue_cb(lkb, flags, mode, status, sbflags, &cb);
if (!rv)
list_add(&cb->list, &ls->ls_cb_delay);
else
} else {
if (test_bit(LSFL_SOFTIRQ, &ls->ls_flags)) {
dlm_run_callback(ls->ls_global_id, lkb->lkb_id, mode, flags,
sbflags, status, lkb->lkb_lksb,
lkb->lkb_astfn, lkb->lkb_bastfn,
lkb->lkb_astparam, rsb->res_name,
rsb->res_length);
} else {
rv = dlm_get_queue_cb(lkb, flags, mode, status, sbflags, &cb);
if (!rv)
queue_work(ls->ls_callback_wq, &cb->work);
spin_unlock_bh(&ls->ls_cb_lock);
break;
case DLM_ENQUEUE_CALLBACK_SUCCESS:
break;
case DLM_ENQUEUE_CALLBACK_FAILURE:
fallthrough;
default:
WARN_ON_ONCE(1);
break;
}
}
spin_unlock_bh(&ls->ls_cb_lock);
}
int dlm_callback_start(struct dlm_ls *ls)
{
if (!test_bit(LSFL_FS, &ls->ls_flags))
if (!test_bit(LSFL_FS, &ls->ls_flags) ||
test_bit(LSFL_SOFTIRQ, &ls->ls_flags))
return 0;
ls->ls_callback_wq = alloc_ordered_workqueue("dlm_callback",
@ -207,7 +248,11 @@ void dlm_callback_resume(struct dlm_ls *ls)
spin_lock_bh(&ls->ls_cb_lock);
list_for_each_entry_safe(cb, safe, &ls->ls_cb_delay, list) {
list_del(&cb->list);
if (test_bit(LSFL_SOFTIRQ, &ls->ls_flags))
dlm_do_callback(cb);
else
queue_work(ls->ls_callback_wq, &cb->work);
count++;
if (count == MAX_CB_QUEUE)
break;

7
fs/dlm/ast.h
View File

@ -11,10 +11,9 @@
#ifndef __ASTD_DOT_H__
#define __ASTD_DOT_H__
#define DLM_ENQUEUE_CALLBACK_NEED_SCHED 1
#define DLM_ENQUEUE_CALLBACK_SUCCESS 0
#define DLM_ENQUEUE_CALLBACK_FAILURE -1
int dlm_queue_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
bool dlm_may_skip_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
int status, uint32_t sbflags, int *copy_lvb);
int dlm_get_cb(struct dlm_lkb *lkb, uint32_t flags, int mode,
int status, uint32_t sbflags,
struct dlm_callback **cb);
void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,

1
fs/dlm/dlm_internal.h
View File

@ -699,6 +699,7 @@ struct dlm_ls {
#define LSFL_NODIR 10
#define LSFL_RECV_MSG_BLOCKED 11
#define LSFL_FS 12
#define LSFL_SOFTIRQ 13
#define DLM_PROC_FLAGS_CLOSING 1
#define DLM_PROC_FLAGS_COMPAT 2

3
fs/dlm/lockspace.c
View File

@ -407,6 +407,9 @@ static int new_lockspace(const char *name, const char *cluster,
ls->ls_ops_arg = ops_arg;
}
if (flags & DLM_LSFL_SOFTIRQ)
set_bit(LSFL_SOFTIRQ, &ls->ls_flags);
/* ls_exflags are forced to match among nodes, and we don't
* need to require all nodes to have some flags set
*/

22
fs/dlm/user.c
View File

@ -182,7 +182,7 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode,
struct dlm_user_args *ua;
struct dlm_user_proc *proc;
struct dlm_callback *cb;
int rv;
int rv, copy_lvb;
if (test_bit(DLM_DFL_ORPHAN_BIT, &lkb->lkb_dflags) ||
test_bit(DLM_IFL_DEAD_BIT, &lkb->lkb_iflags))
@ -213,12 +213,14 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode,
spin_lock_bh(&proc->asts_spin);
rv = dlm_queue_lkb_callback(lkb, flags, mode, status, sbflags, &cb);
switch (rv) {
case DLM_ENQUEUE_CALLBACK_NEED_SCHED:
if (!dlm_may_skip_callback(lkb, flags, mode, status, sbflags,
&copy_lvb)) {
rv = dlm_get_cb(lkb, flags, mode, status, sbflags, &cb);
if (!rv) {
cb->copy_lvb = copy_lvb;
cb->ua = *ua;
cb->lkb_lksb = &cb->ua.lksb;
if (cb->copy_lvb) {
if (copy_lvb) {
memcpy(cb->lvbptr, ua->lksb.sb_lvbptr,
DLM_USER_LVB_LEN);
cb->lkb_lksb->sb_lvbptr = cb->lvbptr;
@ -226,15 +228,7 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode,
list_add_tail(&cb->list, &proc->asts);
wake_up_interruptible(&proc->wait);
break;
case DLM_ENQUEUE_CALLBACK_SUCCESS:
break;
case DLM_ENQUEUE_CALLBACK_FAILURE:
fallthrough;
default:
spin_unlock_bh(&proc->asts_spin);
WARN_ON_ONCE(1);
goto out;
}
}
spin_unlock_bh(&proc->asts_spin);