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dlm: async freeing of lockspace resources

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This patch handles freeing of lockspace resources asynchronously besides
the release_lockspace() context. The release_lockspace() context is
sometimes called in a time critical context, e.g. umount syscall. Most
every user space init system will timeout if it takes too long. To
reduce the potential waiting time we deregister in release_lockspace()
the lockspace from the DLM subsystem and do the actual releasing of
lockspace resource in a worker of a workqueue following recommendation
of:

https://lore.kernel.org/all/49925af7-78a8-a3dd-bce6-cfc02e1a9236@I-love.SAKURA.ne.jp/T/#u

as flushing of system workqueues are not allowed. The most time to
release the DLM resources are spent to release the data structures
"ls->ls_lkbxa" and "ls->ls_rsbtbl" as they iterate over each entries and
those data structures can contain millions of entries. This patch handles
for now only freeing of those data structures as those operations are
the most reason why release_lockspace() blocking of being returned.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2024-08-02 13:26:43 -04:00 committed by David Teigland
parent 8a4cf500f1
commit 94e180d625
3 changed files with 58 additions and 33 deletions
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4
fs/dlm/dlm_internal.h
View File

@ -660,6 +660,8 @@ struct dlm_ls {
const struct dlm_lockspace_ops *ls_ops;
void *ls_ops_arg;
struct work_struct ls_free_work;
int ls_namelen;
char ls_name[DLM_LOCKSPACE_LEN + 1];
};
@ -803,6 +805,8 @@ static inline void dlm_set_sbflags_val(struct dlm_lkb *lkb, uint32_t val)
__DLM_SBF_MAX_BIT);
}
extern struct workqueue_struct *dlm_wq;
int dlm_plock_init(void);
void dlm_plock_exit(void);

77
fs/dlm/lockspace.c
View File

@ -315,6 +315,44 @@ static int threads_start(void)
return error;
}
static int lkb_idr_free(struct dlm_lkb *lkb)
{
if (lkb->lkb_lvbptr && test_bit(DLM_IFL_MSTCPY_BIT, &lkb->lkb_iflags))
dlm_free_lvb(lkb->lkb_lvbptr);
dlm_free_lkb(lkb);
return 0;
}
static void rhash_free_rsb(void *ptr, void *arg)
{
struct dlm_rsb *rsb = ptr;
dlm_free_rsb(rsb);
}
static void free_lockspace(struct work_struct *work)
{
struct dlm_ls *ls = container_of(work, struct dlm_ls, ls_free_work);
struct dlm_lkb *lkb;
unsigned long id;
/*
* Free all lkb's in xa
*/
xa_for_each(&ls->ls_lkbxa, id, lkb) {
lkb_idr_free(lkb);
}
xa_destroy(&ls->ls_lkbxa);
/*
* Free all rsb's on rsbtbl
*/
rhashtable_free_and_destroy(&ls->ls_rsbtbl, rhash_free_rsb, NULL);
kfree(ls);
}
static int new_lockspace(const char *name, const char *cluster,
uint32_t flags, int lvblen,
const struct dlm_lockspace_ops *ops, void *ops_arg,
@ -445,6 +483,8 @@ static int new_lockspace(const char *name, const char *cluster,
spin_lock_init(&ls->ls_cb_lock);
INIT_LIST_HEAD(&ls->ls_cb_delay);
INIT_WORK(&ls->ls_free_work, free_lockspace);
ls->ls_recoverd_task = NULL;
mutex_init(&ls->ls_recoverd_active);
spin_lock_init(&ls->ls_recover_lock);
@ -627,15 +667,6 @@ int dlm_new_user_lockspace(const char *name, const char *cluster,
ops_arg, ops_result, lockspace);
}
static int lkb_idr_free(struct dlm_lkb *lkb)
{
if (lkb->lkb_lvbptr && test_bit(DLM_IFL_MSTCPY_BIT, &lkb->lkb_iflags))
dlm_free_lvb(lkb->lkb_lvbptr);
dlm_free_lkb(lkb);
return 0;
}
/* NOTE: We check the lkbxa here rather than the resource table.
This is because there may be LKBs queued as ASTs that have been unlinked
from their RSBs and are pending deletion once the AST has been delivered */
@ -667,17 +698,8 @@ static int lockspace_busy(struct dlm_ls *ls, int force)
return rv;
}
static void rhash_free_rsb(void *ptr, void *arg)
{
struct dlm_rsb *rsb = ptr;
dlm_free_rsb(rsb);
}
static int release_lockspace(struct dlm_ls *ls, int force)
{
struct dlm_lkb *lkb;
unsigned long id;
int busy, rv;
busy = lockspace_busy(ls, force);
@ -735,19 +757,6 @@ static int release_lockspace(struct dlm_ls *ls, int force)
xa_destroy(&ls->ls_recover_xa);
kfree(ls->ls_recover_buf);
/*
* Free all lkb's in xa
*/
xa_for_each(&ls->ls_lkbxa, id, lkb) {
lkb_idr_free(lkb);
}
xa_destroy(&ls->ls_lkbxa);
/*
* Free all rsb's on rsbtbl
*/
rhashtable_free_and_destroy(&ls->ls_rsbtbl, rhash_free_rsb, NULL);
/*
* Free structures on any other lists
*/
@ -757,9 +766,11 @@ static int release_lockspace(struct dlm_ls *ls, int force)
dlm_clear_members(ls);
dlm_clear_members_gone(ls);
kfree(ls->ls_node_array);
log_rinfo(ls, "release_lockspace final free");
kfree(ls);
log_rinfo(ls, "%s final free", __func__);
/* delayed free of data structures see free_lockspace() */
queue_work(dlm_wq, &ls->ls_free_work);
module_put(THIS_MODULE);
return 0;
}

10
fs/dlm/main.c
View File

@ -22,6 +22,8 @@
#define CREATE_TRACE_POINTS
#include <trace/events/dlm.h>
struct workqueue_struct *dlm_wq;
static int __init init_dlm(void)
{
int error;
@ -50,10 +52,16 @@ static int __init init_dlm(void)
if (error)
goto out_user;
dlm_wq = alloc_workqueue("dlm_wq", 0, 0);
if (!dlm_wq)
goto out_plock;
printk("DLM installed\n");
return 0;
out_plock:
dlm_plock_exit();
out_user:
dlm_user_exit();
out_debug:
@ -70,6 +78,8 @@ static int __init init_dlm(void)
static void __exit exit_dlm(void)
{
/* be sure every pending work e.g. freeing is done */
destroy_workqueue(dlm_wq);
dlm_plock_exit();
dlm_user_exit();
dlm_config_exit();