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| author | Jane Chu <jane.chu@oracle.com> | 2022-04-23 00:45:06 +0200 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-05-16 22:37:59 +0200 |
| commit | 047218ec904da19c45c4a70274fc3f818a1fcba1 (patch) | |
| tree | 6602586a5cbfa59b34a6699c920a0d4e7ad7dac8 /drivers/md/dm-linear.c | |
| parent | dax: introduce DAX_RECOVERY_WRITE dax access mode (diff) | |
| download | linux-047218ec904da19c45c4a70274fc3f818a1fcba1.tar.xz linux-047218ec904da19c45c4a70274fc3f818a1fcba1.zip | |
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/dm-linear.c')
| -rw-r--r-- | drivers/md/dm-linear.c | 10 |
1 files changed, 10 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) |