Introduce dax_recovery_write() operation. The function is used to
recover a dax range that contains poison. Typical use case is when
a user process receives a SIGBUS with si_code BUS_MCEERR_AR
indicating poison(s) in a dax range, in response, the user process
issues a pwrite() to the page-aligned dax range, thus clears the
poison and puts valid data in the range.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jane Chu <jane.chu@xxxxxxxxxx>
---
drivers/dax/super.c | 9 +++++++++
drivers/md/dm-linear.c | 10 ++++++++++
drivers/md/dm-log-writes.c | 10 ++++++++++
drivers/md/dm-stripe.c | 10 ++++++++++
drivers/md/dm.c | 20 ++++++++++++++++++++
drivers/nvdimm/pmem.c | 7 +++++++
fs/dax.c | 13 ++++++++++++-
include/linux/dax.h | 13 +++++++++++++
include/linux/device-mapper.h | 9 +++++++++
9 files changed, 100 insertions(+), 1 deletion(-)
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 5405eb553430..50a08b2ec247 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -195,6 +195,15 @@ int dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
}
EXPORT_SYMBOL_GPL(dax_zero_page_range);
+size_t dax_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *iter)
+{
+ if (!dax_dev->ops->recovery_write)
+ return 0;
+ return dax_dev->ops->recovery_write(dax_dev, pgoff, addr, bytes, iter);
+}
+EXPORT_SYMBOL_GPL(dax_recovery_write);
+
#ifdef CONFIG_ARCH_HAS_PMEM_API
void arch_wb_cache_pmem(void *addr, size_t size);
void dax_flush(struct dax_device *dax_dev, void *addr, size_t size)
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 13e263299c9c..cdf48bc8c5b0 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -188,9 +188,18 @@ static int linear_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
return dax_zero_page_range(dax_dev, pgoff, nr_pages);
}
+static size_t linear_dax_recovery_write(struct dm_target *ti, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *i)
+{
+ struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff);
+
+ return dax_recovery_write(dax_dev, pgoff, addr, bytes, i);
+}
+
#else
#define linear_dax_direct_access NULL
#define linear_dax_zero_page_range NULL
+#define linear_dax_recovery_write NULL
#endif
static struct target_type linear_target = {
@@ -208,6 +217,7 @@ static struct target_type linear_target = {
.iterate_devices = linear_iterate_devices,
.direct_access = linear_dax_direct_access,
.dax_zero_page_range = linear_dax_zero_page_range,
+ .dax_recovery_write = linear_dax_recovery_write,
};
int __init dm_linear_init(void)
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 06bdbed65eb1..22739dccdd17 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -905,9 +905,18 @@ static int log_writes_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
return dax_zero_page_range(dax_dev, pgoff, nr_pages << PAGE_SHIFT);
}
+static size_t log_writes_dax_recovery_write(struct dm_target *ti,
+ pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i)
+{
+ struct dax_device *dax_dev = log_writes_dax_pgoff(ti, &pgoff);
+
+ return dax_recovery_write(dax_dev, pgoff, addr, bytes, i);
+}
+
#else
#define log_writes_dax_direct_access NULL
#define log_writes_dax_zero_page_range NULL
+#define log_writes_dax_recovery_write NULL
#endif
static struct target_type log_writes_target = {
@@ -925,6 +934,7 @@ static struct target_type log_writes_target = {
.io_hints = log_writes_io_hints,
.direct_access = log_writes_dax_direct_access,
.dax_zero_page_range = log_writes_dax_zero_page_range,
+ .dax_recovery_write = log_writes_dax_recovery_write,
};
static int __init dm_log_writes_init(void)
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 77d72900e997..baa085cc67bd 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -331,9 +331,18 @@ static int stripe_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
return dax_zero_page_range(dax_dev, pgoff, nr_pages);
}
+static size_t stripe_dax_recovery_write(struct dm_target *ti, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *i)
+{
+ struct dax_device *dax_dev = stripe_dax_pgoff(ti, &pgoff);
+
+ return dax_recovery_write(dax_dev, pgoff, addr, bytes, i);
+}
+
#else
#define stripe_dax_direct_access NULL
#define stripe_dax_zero_page_range NULL
+#define stripe_dax_recovery_write NULL
#endif
/*
@@ -470,6 +479,7 @@ static struct target_type stripe_target = {
.io_hints = stripe_io_hints,
.direct_access = stripe_dax_direct_access,
.dax_zero_page_range = stripe_dax_zero_page_range,
+ .dax_recovery_write = stripe_dax_recovery_write,
};
int __init dm_stripe_init(void)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 8258676a352f..5374c8aba2d6 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1147,6 +1147,25 @@ static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
return ret;
}
+static size_t dm_dax_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *i)
+{
+ struct mapped_device *md = dax_get_private(dax_dev);
+ sector_t sector = pgoff * PAGE_SECTORS;
+ struct dm_target *ti;
+ int srcu_idx;
+ long ret = 0;
+
+ ti = dm_dax_get_live_target(md, sector, &srcu_idx);
+ if (!ti || !ti->type->dax_recovery_write)
+ goto out;
+
+ ret = ti->type->dax_recovery_write(ti, pgoff, addr, bytes, i);
+out:
+ dm_put_live_table(md, srcu_idx);
+ return ret;
+}
+
/*
* A target may call dm_accept_partial_bio only from the map routine. It is
* allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_* zone management
@@ -3151,6 +3170,7 @@ static const struct block_device_operations dm_rq_blk_dops = {
static const struct dax_operations dm_dax_ops = {
.direct_access = dm_dax_direct_access,
.zero_page_range = dm_dax_zero_page_range,
+ .recovery_write = dm_dax_recovery_write,
};
/*
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 47f34c50f944..e5e288135af7 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -287,9 +287,16 @@ static long pmem_dax_direct_access(struct dax_device *dax_dev,
return __pmem_direct_access(pmem, pgoff, nr_pages, mode, kaddr, pfn);
}
+static size_t pmem_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *i)
+{
+ return 0;
+}
+
static const struct dax_operations pmem_dax_ops = {
.direct_access = pmem_dax_direct_access,
.zero_page_range = pmem_dax_zero_page_range,
+ .recovery_write = pmem_recovery_write,
};
static ssize_t write_cache_show(struct device *dev,
diff --git a/fs/dax.c b/fs/dax.c
index ef3103107104..a1e4b45cbf55 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1240,6 +1240,7 @@ static loff_t dax_iomap_iter(const struct iomap_iter *iomi,
const size_t size = ALIGN(length + offset, PAGE_SIZE);
pgoff_t pgoff = dax_iomap_pgoff(iomap, pos);
ssize_t map_len;
+ bool recovery = false;
void *kaddr;
if (fatal_signal_pending(current)) {
@@ -1249,6 +1250,13 @@ static loff_t dax_iomap_iter(const struct iomap_iter *iomi,
map_len = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size),
DAX_ACCESS, &kaddr, NULL);
+ if (map_len == -EIO && iov_iter_rw(iter) == WRITE) {
+ map_len = dax_direct_access(dax_dev, pgoff,
+ PHYS_PFN(size), DAX_RECOVERY_WRITE,
+ &kaddr, NULL);
+ if (map_len > 0)
+ recovery = true;
+ }
if (map_len < 0) {
ret = map_len;
break;
@@ -1260,7 +1268,10 @@ static loff_t dax_iomap_iter(const struct iomap_iter *iomi,
if (map_len > end - pos)
map_len = end - pos;
- if (iov_iter_rw(iter) == WRITE)
+ if (recovery)
+ xfer = dax_recovery_write(dax_dev, pgoff, kaddr,
+ map_len, iter);
+ else if (iov_iter_rw(iter) == WRITE)
xfer = dax_copy_from_iter(dax_dev, pgoff, kaddr,
map_len, iter);
else
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 3f1339bce3c0..e7b81634c52a 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -35,6 +35,12 @@ struct dax_operations {
sector_t, sector_t);
/* zero_page_range: required operation. Zero page range */
int (*zero_page_range)(struct dax_device *, pgoff_t, size_t);
+ /*
+ * recovery_write: recover a poisoned range by DAX device driver
+ * capable of clearing poison.
+ */
+ size_t (*recovery_write)(struct dax_device *dax_dev, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *iter);
};
#if IS_ENABLED(CONFIG_DAX)
@@ -45,6 +51,8 @@ void dax_write_cache(struct dax_device *dax_dev, bool wc);
bool dax_write_cache_enabled(struct dax_device *dax_dev);
bool dax_synchronous(struct dax_device *dax_dev);
void set_dax_synchronous(struct dax_device *dax_dev);
+size_t dax_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *i);
/*
* Check if given mapping is supported by the file / underlying device.
*/
@@ -92,6 +100,11 @@ static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
{
return !(vma->vm_flags & VM_SYNC);
}
+static inline size_t dax_recovery_write(struct dax_device *dax_dev,
+ pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i)
+{
+ return 0;
+}
#endif
void set_dax_nocache(struct dax_device *dax_dev);
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index acdedda0d12b..47a01c7cffdf 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -152,6 +152,14 @@ typedef long (*dm_dax_direct_access_fn) (struct dm_target *ti, pgoff_t pgoff,
typedef int (*dm_dax_zero_page_range_fn)(struct dm_target *ti, pgoff_t pgoff,
size_t nr_pages);
+/*
+ * Returns:
+ * != 0 : number of bytes transferred
+ * 0 : recovery write failed
+ */
+typedef size_t (*dm_dax_recovery_write_fn)(struct dm_target *ti, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *i);
+
void dm_error(const char *message);
struct dm_dev {
@@ -201,6 +209,7 @@ struct target_type {
dm_io_hints_fn io_hints;
dm_dax_direct_access_fn direct_access;
dm_dax_zero_page_range_fn dax_zero_page_range;
+ dm_dax_recovery_write_fn dax_recovery_write;
/* For internal device-mapper use. */
struct list_head list;
--
2.18.4
