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authorJane Chu <jane.chu@oracle.com>2022-04-22 16:45:06 -0600
committerDan Williams <dan.j.williams@intel.com>2022-05-16 13:37:59 -0700
commit047218ec904da19c45c4a70274fc3f818a1fcba1 (patch)
tree6602586a5cbfa59b34a6699c920a0d4e7ad7dac8 /drivers/md
parente511c4a3d2a1f64aafc1f5df37a2ffcf7ef91b55 (diff)
downloadlinux-047218ec904da19c45c4a70274fc3f818a1fcba1.tar.bz2
dax: add .recovery_write dax_operation
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@lst.de> Signed-off-by: Jane Chu <jane.chu@oracle.com> Link: https://lore.kernel.org/r/20220422224508.440670-6-jane.chu@oracle.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-linear.c10
-rw-r--r--drivers/md/dm-log-writes.c10
-rw-r--r--drivers/md/dm-stripe.c10
-rw-r--r--drivers/md/dm.c20
4 files changed, 50 insertions, 0 deletions
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 9c452641c3d5..3fe76ab20069 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
@@ -3147,6 +3166,7 @@ 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,
};
/*