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dax: add .recovery_write dax_operation

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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>
This commit is contained in:
Jane Chu
2022-04-22 16:45:06 -06:00
committed by Dan Williams
parent e511c4a3d2
commit 047218ec90
9 changed files with 100 additions and 1 deletions
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13
include/linux/dax.h
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@@ -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);