From fefc1d97fa4b5e016bbe15447dc3edcd9e1bcb9f Mon Sep 17 00:00:00 2001 From: Pankaj Gupta Date: Fri, 5 Jul 2019 19:33:24 +0530 Subject: libnvdimm: add dax_dev sync flag 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 Signed-off-by: Dan Williams --- drivers/nvdimm/pmem.c | 5 ++++- drivers/nvdimm/region_devs.c | 7 +++++++ 2 files changed, 11 insertions(+), 1 deletion(-) (limited to 'drivers/nvdimm') diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 223da63d1bd7..8be868e2a18b 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -376,6 +376,7 @@ static int pmem_attach_disk(struct device *dev, struct gendisk *disk; void *addr; int rc; + unsigned long flags = 0UL; pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); if (!pmem) @@ -474,7 +475,9 @@ static int pmem_attach_disk(struct device *dev, nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_res); disk->bb = &pmem->bb; - dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops); + if (is_nvdimm_sync(nd_region)) + flags = DAXDEV_F_SYNC; + dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops, flags); if (!dax_dev) { put_disk(disk); return -ENOMEM; diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index eca2e62af134..56f2227f192a 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -1211,6 +1211,13 @@ int nvdimm_has_cache(struct nd_region *nd_region) } EXPORT_SYMBOL_GPL(nvdimm_has_cache); +bool is_nvdimm_sync(struct nd_region *nd_region) +{ + return is_nd_pmem(&nd_region->dev) && + !test_bit(ND_REGION_ASYNC, &nd_region->flags); +} +EXPORT_SYMBOL_GPL(is_nvdimm_sync); + struct conflict_context { struct nd_region *nd_region; resource_size_t start, size; -- cgit v1.2.3-59-g8ed1b