[PATCH v3 1/5] libnvdimm: nd_region flush callback support
This patch adds functionality to perform flush from guest
to host over VIRTIO. We are registering a callback based
on 'nd_region' type. virtio_pmem driver requires this special
flush function. For rest of the region types we are registering
existing flush function. Report error returned by host fsync
failure to userspace.
This also handles asynchronous flush requests from the block layer
by creating a child bio and chaining it with parent bio.
Signed-off-by: Pankaj Gupta
---
drivers/acpi/nfit/core.c | 4 ++--
drivers/nvdimm/claim.c | 6 --
drivers/nvdimm/nd.h | 1 +
drivers/nvdimm/pmem.c| 12
drivers/nvdimm/region_devs.c | 38 --
include/linux/libnvdimm.h| 5 -
6 files changed, 55 insertions(+), 11 deletions(-)
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index b072cfc..f154852 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2234,7 +2234,7 @@ static void write_blk_ctl(struct nfit_blk *nfit_blk,
unsigned int bw,
offset = to_interleave_offset(offset, mmio);
writeq(cmd, mmio->addr.base + offset);
- nvdimm_flush(nfit_blk->nd_region);
+ nvdimm_flush(nfit_blk->nd_region, NULL, false);
if (nfit_blk->dimm_flags & NFIT_BLK_DCR_LATCH)
readq(mmio->addr.base + offset);
@@ -2283,7 +2283,7 @@ static int acpi_nfit_blk_single_io(struct nfit_blk
*nfit_blk,
}
if (rw)
- nvdimm_flush(nfit_blk->nd_region);
+ nvdimm_flush(nfit_blk->nd_region, NULL, false);
rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
return rc;
diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c
index fb667bf..a1dfa06 100644
--- a/drivers/nvdimm/claim.c
+++ b/drivers/nvdimm/claim.c
@@ -263,7 +263,7 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
sector_t sector = offset >> 9;
- int rc = 0;
+ int rc = 0, ret = 0;
if (unlikely(!size))
return 0;
@@ -301,7 +301,9 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
}
memcpy_flushcache(nsio->addr + offset, buf, size);
- nvdimm_flush(to_nd_region(ndns->dev.parent));
+ ret = nvdimm_flush(to_nd_region(ndns->dev.parent), NULL, false);
+ if (ret)
+ rc = ret;
return rc;
}
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 98317e7..d53a2d1 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -160,6 +160,7 @@ struct nd_region {
struct nd_interleave_set *nd_set;
struct nd_percpu_lane __percpu *lane;
struct nd_mapping mapping[0];
+ int (*flush)(struct nd_region *nd_region);
};
struct nd_blk_region {
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 6071e29..5d6a4a1 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -192,6 +192,7 @@ static blk_status_t pmem_do_bvec(struct pmem_device *pmem,
struct page *page,
static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
{
+ int ret = 0;
blk_status_t rc = 0;
bool do_acct;
unsigned long start;
@@ -201,7 +202,7 @@ static blk_qc_t pmem_make_request(struct request_queue *q,
struct bio *bio)
struct nd_region *nd_region = to_region(pmem);
if (bio->bi_opf & REQ_PREFLUSH)
- nvdimm_flush(nd_region);
+ ret = nvdimm_flush(nd_region, bio, true);
do_acct = nd_iostat_start(bio, &start);
bio_for_each_segment(bvec, bio, iter) {
@@ -216,7 +217,10 @@ static blk_qc_t pmem_make_request(struct request_queue *q,
struct bio *bio)
nd_iostat_end(bio, start);
if (bio->bi_opf & REQ_FUA)
- nvdimm_flush(nd_region);
+ ret = nvdimm_flush(nd_region, bio, true);
+
+ if (ret)
+ bio->bi_status = errno_to_blk_status(ret);
bio_endio(bio);
return BLK_QC_T_NONE;
@@ -528,14 +532,14 @@ static int nd_pmem_remove(struct device *dev)
sysfs_put(pmem->bb_state);
pmem->bb_state = NULL;
}
- nvdimm_flush(to_nd_region(dev->parent));
+ nvdimm_flush(to_nd_region(dev->parent), NULL, false);
return 0;
}
static void nd_pmem_shutdown(struct device *dev)
{
- nvdimm_flush(to_nd_region(dev->parent));
+ nvdimm_flush(to_nd_region(dev->parent), NULL, false);
}
static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index fa37afc..5508727 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -290,7 +290,9 @@ static ssize_t deep_flush_store(struct device *dev, struct
device_attribute *att
return rc;
[PATCH v3 1/5] libnvdimm: nd_region flush callback support
This patch adds functionality to perform flush from guest
to host over VIRTIO. We are registering a callback based
on 'nd_region' type. virtio_pmem driver requires this special
flush function. For rest of the region types we are registering
existing flush function. Report error returned by host fsync
failure to userspace.
This also handles asynchronous flush requests from the block layer
by creating a child bio and chaining it with parent bio.
Signed-off-by: Pankaj Gupta
---
drivers/acpi/nfit/core.c | 4 ++--
drivers/nvdimm/claim.c | 6 --
drivers/nvdimm/nd.h | 1 +
drivers/nvdimm/pmem.c| 12
drivers/nvdimm/region_devs.c | 38 --
include/linux/libnvdimm.h| 5 -
6 files changed, 55 insertions(+), 11 deletions(-)
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index b072cfc..f154852 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2234,7 +2234,7 @@ static void write_blk_ctl(struct nfit_blk *nfit_blk,
unsigned int bw,
offset = to_interleave_offset(offset, mmio);
writeq(cmd, mmio->addr.base + offset);
- nvdimm_flush(nfit_blk->nd_region);
+ nvdimm_flush(nfit_blk->nd_region, NULL, false);
if (nfit_blk->dimm_flags & NFIT_BLK_DCR_LATCH)
readq(mmio->addr.base + offset);
@@ -2283,7 +2283,7 @@ static int acpi_nfit_blk_single_io(struct nfit_blk
*nfit_blk,
}
if (rw)
- nvdimm_flush(nfit_blk->nd_region);
+ nvdimm_flush(nfit_blk->nd_region, NULL, false);
rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
return rc;
diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c
index fb667bf..a1dfa06 100644
--- a/drivers/nvdimm/claim.c
+++ b/drivers/nvdimm/claim.c
@@ -263,7 +263,7 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
sector_t sector = offset >> 9;
- int rc = 0;
+ int rc = 0, ret = 0;
if (unlikely(!size))
return 0;
@@ -301,7 +301,9 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
}
memcpy_flushcache(nsio->addr + offset, buf, size);
- nvdimm_flush(to_nd_region(ndns->dev.parent));
+ ret = nvdimm_flush(to_nd_region(ndns->dev.parent), NULL, false);
+ if (ret)
+ rc = ret;
return rc;
}
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 98317e7..d53a2d1 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -160,6 +160,7 @@ struct nd_region {
struct nd_interleave_set *nd_set;
struct nd_percpu_lane __percpu *lane;
struct nd_mapping mapping[0];
+ int (*flush)(struct nd_region *nd_region);
};
struct nd_blk_region {
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 6071e29..5d6a4a1 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -192,6 +192,7 @@ static blk_status_t pmem_do_bvec(struct pmem_device *pmem,
struct page *page,
static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
{
+ int ret = 0;
blk_status_t rc = 0;
bool do_acct;
unsigned long start;
@@ -201,7 +202,7 @@ static blk_qc_t pmem_make_request(struct request_queue *q,
struct bio *bio)
struct nd_region *nd_region = to_region(pmem);
if (bio->bi_opf & REQ_PREFLUSH)
- nvdimm_flush(nd_region);
+ ret = nvdimm_flush(nd_region, bio, true);
do_acct = nd_iostat_start(bio, &start);
bio_for_each_segment(bvec, bio, iter) {
@@ -216,7 +217,10 @@ static blk_qc_t pmem_make_request(struct request_queue *q,
struct bio *bio)
nd_iostat_end(bio, start);
if (bio->bi_opf & REQ_FUA)
- nvdimm_flush(nd_region);
+ ret = nvdimm_flush(nd_region, bio, true);
+
+ if (ret)
+ bio->bi_status = errno_to_blk_status(ret);
bio_endio(bio);
return BLK_QC_T_NONE;
@@ -528,14 +532,14 @@ static int nd_pmem_remove(struct device *dev)
sysfs_put(pmem->bb_state);
pmem->bb_state = NULL;
}
- nvdimm_flush(to_nd_region(dev->parent));
+ nvdimm_flush(to_nd_region(dev->parent), NULL, false);
return 0;
}
static void nd_pmem_shutdown(struct device *dev)
{
- nvdimm_flush(to_nd_region(dev->parent));
+ nvdimm_flush(to_nd_region(dev->parent), NULL, false);
}
static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index fa37afc..5508727 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -290,7 +290,9 @@ static ssize_t deep_flush_store(struct device *dev, struct
device_attribute *att
return rc;
