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dlm: replace usage of found with dedicated list iterator variable

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To move the list iterator variable into the list_for_each_entry_*()
macro in the future it should be avoided to use the list iterator
variable after the loop body.

To *never* use the list iterator variable after the loop it was
concluded to use a separate iterator variable instead of a
found boolean [1].

This removes the need to use a found variable and simply checking if
the variable was set, can determine if the break/goto was hit.

Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Jakob Koschel 2022-04-06 14:05:31 -04:00 committed by David Teigland
parent c490b3afaa
commit dc1acd5c94
3 changed files with 56 additions and 60 deletions
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53
fs/dlm/lock.c
View file

@ -1885,7 +1885,7 @@ static void del_timeout(struct dlm_lkb *lkb)
void dlm_scan_timeout(struct dlm_ls *ls)
{
struct dlm_rsb *r;
struct dlm_lkb *lkb;
struct dlm_lkb *lkb = NULL, *iter;
int do_cancel, do_warn;
s64 wait_us;
@ -1896,27 +1896,28 @@ void dlm_scan_timeout(struct dlm_ls *ls)
do_cancel = 0;
do_warn = 0;
mutex_lock(&ls->ls_timeout_mutex);
list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list) {
list_for_each_entry(iter, &ls->ls_timeout, lkb_time_list) {
wait_us = ktime_to_us(ktime_sub(ktime_get(),
lkb->lkb_timestamp));
iter->lkb_timestamp));
if ((lkb->lkb_exflags & DLM_LKF_TIMEOUT) &&
wait_us >= (lkb->lkb_timeout_cs * 10000))
if ((iter->lkb_exflags & DLM_LKF_TIMEOUT) &&
wait_us >= (iter->lkb_timeout_cs * 10000))
do_cancel = 1;
if ((lkb->lkb_flags & DLM_IFL_WATCH_TIMEWARN) &&
if ((iter->lkb_flags & DLM_IFL_WATCH_TIMEWARN) &&
wait_us >= dlm_config.ci_timewarn_cs * 10000)
do_warn = 1;
if (!do_cancel && !do_warn)
continue;
hold_lkb(lkb);
hold_lkb(iter);
lkb = iter;
break;
}
mutex_unlock(&ls->ls_timeout_mutex);
if (!do_cancel && !do_warn)
if (!lkb)
break;
r = lkb->lkb_resource;
@ -5292,21 +5293,18 @@ void dlm_recover_waiters_pre(struct dlm_ls *ls)
static struct dlm_lkb *find_resend_waiter(struct dlm_ls *ls)
{
struct dlm_lkb *lkb;
int found = 0;
struct dlm_lkb *lkb = NULL, *iter;
mutex_lock(&ls->ls_waiters_mutex);
list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
if (lkb->lkb_flags & DLM_IFL_RESEND) {
hold_lkb(lkb);
found = 1;
list_for_each_entry(iter, &ls->ls_waiters, lkb_wait_reply) {
if (iter->lkb_flags & DLM_IFL_RESEND) {
hold_lkb(iter);
lkb = iter;
break;
}
}
mutex_unlock(&ls->ls_waiters_mutex);
if (!found)
lkb = NULL;
return lkb;
}
@ -5964,37 +5962,36 @@ int dlm_user_adopt_orphan(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
int mode, uint32_t flags, void *name, unsigned int namelen,
unsigned long timeout_cs, uint32_t *lkid)
{
struct dlm_lkb *lkb;
struct dlm_lkb *lkb = NULL, *iter;
struct dlm_user_args *ua;
int found_other_mode = 0;
int found = 0;
int rv = 0;
mutex_lock(&ls->ls_orphans_mutex);
list_for_each_entry(lkb, &ls->ls_orphans, lkb_ownqueue) {
if (lkb->lkb_resource->res_length != namelen)
list_for_each_entry(iter, &ls->ls_orphans, lkb_ownqueue) {
if (iter->lkb_resource->res_length != namelen)
continue;
if (memcmp(lkb->lkb_resource->res_name, name, namelen))
if (memcmp(iter->lkb_resource->res_name, name, namelen))
continue;
if (lkb->lkb_grmode != mode) {
if (iter->lkb_grmode != mode) {
found_other_mode = 1;
continue;
}
found = 1;
list_del_init(&lkb->lkb_ownqueue);
lkb->lkb_flags &= ~DLM_IFL_ORPHAN;
*lkid = lkb->lkb_id;
lkb = iter;
list_del_init(&iter->lkb_ownqueue);
iter->lkb_flags &= ~DLM_IFL_ORPHAN;
*lkid = iter->lkb_id;
break;
}
mutex_unlock(&ls->ls_orphans_mutex);
if (!found && found_other_mode) {
if (!lkb && found_other_mode) {
rv = -EAGAIN;
goto out;
}
if (!found) {
if (!lkb) {
rv = -ENOENT;
goto out;
}

24
fs/dlm/plock.c
View file

@ -407,9 +407,9 @@ static ssize_t dev_read(struct file *file, char __user *u, size_t count,
static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
loff_t *ppos)
{
struct plock_op *op = NULL, *iter;
struct dlm_plock_info info;
struct plock_op *op;
int found = 0, do_callback = 0;
int do_callback = 0;
if (count != sizeof(info))
return -EINVAL;
@ -421,23 +421,23 @@ static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
return -EINVAL;
spin_lock(&ops_lock);
list_for_each_entry(op, &recv_list, list) {
if (op->info.fsid == info.fsid &&
op->info.number == info.number &&
op->info.owner == info.owner) {
list_del_init(&op->list);
memcpy(&op->info, &info, sizeof(info));
if (op->data)
list_for_each_entry(iter, &recv_list, list) {
if (iter->info.fsid == info.fsid &&
iter->info.number == info.number &&
iter->info.owner == info.owner) {
list_del_init(&iter->list);
memcpy(&iter->info, &info, sizeof(info));
if (iter->data)
do_callback = 1;
else
op->done = 1;
found = 1;
iter->done = 1;
op = iter;
break;
}
}
spin_unlock(&ops_lock);
if (found) {
if (op) {
if (do_callback)
dlm_plock_callback(op);
else

39
fs/dlm/recover.c
View file

@ -732,10 +732,9 @@ void dlm_recovered_lock(struct dlm_rsb *r)
static void recover_lvb(struct dlm_rsb *r)
{
struct dlm_lkb *lkb, *high_lkb = NULL;
struct dlm_lkb *big_lkb = NULL, *iter, *high_lkb = NULL;
uint32_t high_seq = 0;
int lock_lvb_exists = 0;
int big_lock_exists = 0;
int lvblen = r->res_ls->ls_lvblen;
if (!rsb_flag(r, RSB_NEW_MASTER2) &&
@ -751,37 +750,37 @@ static void recover_lvb(struct dlm_rsb *r)
/* we are the new master, so figure out if VALNOTVALID should
be set, and set the rsb lvb from the best lkb available. */
list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
list_for_each_entry(iter, &r->res_grantqueue, lkb_statequeue) {
if (!(iter->lkb_exflags & DLM_LKF_VALBLK))
continue;
lock_lvb_exists = 1;
if (lkb->lkb_grmode > DLM_LOCK_CR) {
big_lock_exists = 1;
if (iter->lkb_grmode > DLM_LOCK_CR) {
big_lkb = iter;
goto setflag;
}
if (((int)lkb->lkb_lvbseq - (int)high_seq) >= 0) {
high_lkb = lkb;
high_seq = lkb->lkb_lvbseq;
if (((int)iter->lkb_lvbseq - (int)high_seq) >= 0) {
high_lkb = iter;
high_seq = iter->lkb_lvbseq;
}
}
list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
list_for_each_entry(iter, &r->res_convertqueue, lkb_statequeue) {
if (!(iter->lkb_exflags & DLM_LKF_VALBLK))
continue;
lock_lvb_exists = 1;
if (lkb->lkb_grmode > DLM_LOCK_CR) {
big_lock_exists = 1;
if (iter->lkb_grmode > DLM_LOCK_CR) {
big_lkb = iter;
goto setflag;
}
if (((int)lkb->lkb_lvbseq - (int)high_seq) >= 0) {
high_lkb = lkb;
high_seq = lkb->lkb_lvbseq;
if (((int)iter->lkb_lvbseq - (int)high_seq) >= 0) {
high_lkb = iter;
high_seq = iter->lkb_lvbseq;
}
}
@ -790,7 +789,7 @@ static void recover_lvb(struct dlm_rsb *r)
goto out;
/* lvb is invalidated if only NL/CR locks remain */
if (!big_lock_exists)
if (!big_lkb)
rsb_set_flag(r, RSB_VALNOTVALID);
if (!r->res_lvbptr) {
@ -799,9 +798,9 @@ static void recover_lvb(struct dlm_rsb *r)
goto out;
}
if (big_lock_exists) {
r->res_lvbseq = lkb->lkb_lvbseq;
memcpy(r->res_lvbptr, lkb->lkb_lvbptr, lvblen);
if (big_lkb) {
r->res_lvbseq = big_lkb->lkb_lvbseq;
memcpy(r->res_lvbptr, big_lkb->lkb_lvbptr, lvblen);
} else if (high_lkb) {
r->res_lvbseq = high_lkb->lkb_lvbseq;
memcpy(r->res_lvbptr, high_lkb->lkb_lvbptr, lvblen);