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| author | Jane Chu <jane.chu@oracle.com> | 2022-04-23 01:45:06 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-05-16 23:37:59 +0300 |
| commit | 047218ec904da19c45c4a70274fc3f818a1fcba1 (patch) | |
| tree | 6602586a5cbfa59b34a6699c920a0d4e7ad7dac8 /drivers/nvdimm/pmem.c | |
| parent | e511c4a3d2a1f64aafc1f5df37a2ffcf7ef91b55 (diff) | |
| download | linux-047218ec904da19c45c4a70274fc3f818a1fcba1.tar.xz | |
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/pmem.c')
| -rw-r--r-- | drivers/nvdimm/pmem.c | 7 |
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, |