diff options
| author | Jane Chu <jane.chu@oracle.com> | 2022-04-22 16:45:06 -0600 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-05-16 13:37:59 -0700 |
| commit | 047218ec904da19c45c4a70274fc3f818a1fcba1 (patch) | |
| tree | 6602586a5cbfa59b34a6699c920a0d4e7ad7dac8 /drivers/dax | |
| parent | e511c4a3d2a1f64aafc1f5df37a2ffcf7ef91b55 (diff) | |
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/dax')
| -rw-r--r-- | drivers/dax/super.c | 9 |
1 files changed, 9 insertions, 0 deletions
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) |