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    SubjectRe: [PATCH] dm writecache: skip writecache_wait when using pmem mode


    On Fri, 12 Jun 2020, Huaisheng Ye wrote:

    > From: Huaisheng Ye <yehs1@lenovo.com>
    >
    > The array bio_in_progress is only used with ssd mode. So skip
    > writecache_wait_for_ios in writecache_discard when pmem mode.
    >
    > Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>

    Acked-by: Mikulas Patocka <mpatocka@redhat.com>

    > ---
    > drivers/md/dm-writecache.c | 6 ++++--
    > 1 file changed, 4 insertions(+), 2 deletions(-)
    >
    > diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
    > index 66f3a3b..4367cc7 100644
    > --- a/drivers/md/dm-writecache.c
    > +++ b/drivers/md/dm-writecache.c
    > @@ -849,8 +849,10 @@ static void writecache_discard(struct dm_writecache *wc, sector_t start, sector_
    >
    > if (likely(!e->write_in_progress)) {
    > if (!discarded_something) {
    > - writecache_wait_for_ios(wc, READ);
    > - writecache_wait_for_ios(wc, WRITE);
    > + if (!WC_MODE_PMEM(wc)) {
    > + writecache_wait_for_ios(wc, READ);
    > + writecache_wait_for_ios(wc, WRITE);
    > + }
    > discarded_something = true;
    > }
    > writecache_free_entry(wc, e);
    > --
    > 1.8.3.1
    >

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