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libnvdimm: add dax_dev sync flag

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This patch adds 'DAXDEV_SYNC' flag which is set
for nd_region doing synchronous flush. This later
is used to disable MAP_SYNC functionality for
ext4 & xfs filesystem for devices don't support
synchronous flush.

Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Pankaj Gupta
2019-07-05 19:33:24 +05:30
committed by Dan Williams
parent 6e84200c0a
commit fefc1d97fa
8 changed files with 56 additions and 7 deletions
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3
drivers/md/dm.c
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@@ -1991,7 +1991,8 @@ static struct mapped_device *alloc_dev(int minor)
sprintf(md->disk->disk_name, "dm-%d", minor);
if (IS_ENABLED(CONFIG_DAX_DRIVER)) {
md->dax_dev = alloc_dax(md, md->disk->disk_name, &dm_dax_ops);
md->dax_dev = alloc_dax(md, md->disk->disk_name,
&dm_dax_ops, 0);
if (!md->dax_dev)
goto bad;
}