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drbd: Do not send two barriers without any writes between them 

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2010-06-22 11:26:48 +02:00
parent 11b58e73a3
commit b9b98716f8
1 changed files with 7 additions and 2 deletions
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9
drivers/block/drbd/drbd_main.c
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@ -344,7 +344,7 @@ bail:
static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
{
struct drbd_tl_epoch *b, *tmp, **pn;
struct list_head *le, *tle;
struct list_head *le, *tle, carry_reads;
struct drbd_request *req;
int rv, n_writes, n_reads;
@ -353,6 +353,7 @@ static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
while (b) {
n_writes = 0;
n_reads = 0;
INIT_LIST_HEAD(&carry_reads);
list_for_each_safe(le, tle, &b->requests) {
req = list_entry(le, struct drbd_request, tl_requests);
rv = _req_mod(req, what);
@ -362,7 +363,7 @@ static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
}
tmp = b->next;
if (n_writes + n_reads) {
if (n_writes) {
if (what == resend) {
b->n_writes = n_writes;
if (b->w.cb == NULL) {
@ -375,6 +376,8 @@ static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
}
pn = &b->next;
} else {
if (n_reads)
list_add(&carry_reads, &b->requests);
/* there could still be requests on that ring list,
* in case local io is still pending */
list_del(&b->requests);
@ -389,6 +392,7 @@ static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
/* recycle, but reinit! */
D_ASSERT(tmp == NULL);
INIT_LIST_HEAD(&b->requests);
list_splice(&carry_reads, &b->requests);
INIT_LIST_HEAD(&b->w.list);
b->w.cb = NULL;
b->br_number = net_random();
@ -401,6 +405,7 @@ static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
kfree(b);
}
b = tmp;
list_splice(&carry_reads, &b->requests);
}
}