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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/nvdimm
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/nvdimm')
-rw-r--r--drivers/nvdimm/pmem.c7
1 files changed, 7 insertions, 0 deletions
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,