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Date: Tue, 14 May 2019 20:24:19 +0530 From: Pankaj Gupta <pagupta@...hat.com> To: linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-acpi@...r.kernel.org, qemu-devel@...gnu.org, linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org Cc: dan.j.williams@...el.com, zwisler@...nel.org, vishal.l.verma@...el.com, dave.jiang@...el.com, mst@...hat.com, jasowang@...hat.com, willy@...radead.org, rjw@...ysocki.net, hch@...radead.org, lenb@...nel.org, jack@...e.cz, tytso@....edu, adilger.kernel@...ger.ca, darrick.wong@...cle.com, lcapitulino@...hat.com, kwolf@...hat.com, imammedo@...hat.com, jmoyer@...hat.com, nilal@...hat.com, riel@...riel.com, stefanha@...hat.com, aarcange@...hat.com, david@...hat.com, david@...morbit.com, cohuck@...hat.com, xiaoguangrong.eric@...il.com, pbonzini@...hat.com, kilobyte@...band.pl, yuval.shaia@...cle.com, jstaron@...gle.com, pagupta@...hat.com Subject: [PATCH v9 4/7] dm: enable synchronous dax This patch sets dax device 'DAXDEV_SYNC' flag if all the target devices of device mapper support synchrononous DAX. If device mapper consists of both synchronous and asynchronous dax devices, we don't set 'DAXDEV_SYNC' flag. Signed-off-by: Pankaj Gupta <pagupta@...hat.com> --- drivers/md/dm-table.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index cde3b49b2a91..1cce626ff576 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -886,10 +886,17 @@ static int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, return bdev_dax_supported(dev->bdev, PAGE_SIZE); } +static int device_synchronous(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data) +{ + return dax_synchronous(dev->dax_dev); +} + static bool dm_table_supports_dax(struct dm_table *t) { struct dm_target *ti; unsigned i; + bool dax_sync = true; /* Ensure that all targets support DAX. */ for (i = 0; i < dm_table_get_num_targets(t); i++) { @@ -901,7 +908,14 @@ static bool dm_table_supports_dax(struct dm_table *t) if (!ti->type->iterate_devices || !ti->type->iterate_devices(ti, device_supports_dax, NULL)) return false; + + /* Check devices support synchronous DAX */ + if (dax_sync && + !ti->type->iterate_devices(ti, device_synchronous, NULL)) + dax_sync = false; } + if (dax_sync) + set_dax_synchronous(t->md->dax_dev); return true; } -- 2.20.1
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