Currently pmem_do_write() is written with assumption that all I/O is
sector aligned. Soon I want to use this function in zero_page_range()
where range passed in does not have to be sector aligned.
Modify this function to be able to deal with an arbitrary range. Which
is specified by pmem_off and len.
Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
---
drivers/nvdimm/pmem.c | 30 ++++++++++++++++++++++--------
1 file changed, 22 insertions(+), 8 deletions(-)
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 9ad07cb8c9fc..281fe04d25fd 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -154,15 +154,23 @@ static blk_status_t pmem_do_read(struct pmem_device *pmem,
static blk_status_t pmem_do_write(struct pmem_device *pmem,
struct page *page, unsigned int page_off,
- sector_t sector, unsigned int len)
+ u64 pmem_off, unsigned int len)
{
blk_status_t rc = BLK_STS_OK;
bool bad_pmem = false;
- phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
- void *pmem_addr = pmem->virt_addr + pmem_off;
-
- if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
- bad_pmem = true;
+ phys_addr_t pmem_real_off = pmem_off + pmem->data_offset;
+ void *pmem_addr = pmem->virt_addr + pmem_real_off;
+ sector_t sector_start, sector_end;
+ unsigned nr_sectors;
+
+ sector_start = DIV_ROUND_UP(pmem_off, SECTOR_SIZE);
+ sector_end = (pmem_off + len) >> SECTOR_SHIFT;
+ if (sector_end > sector_start) {
+ nr_sectors = sector_end - sector_start;
+ if (unlikely(is_bad_pmem(&pmem->bb, sector_start,
+ nr_sectors << SECTOR_SHIFT)))
+ bad_pmem = true;
+ }
/*
* Note that we write the data both before and after
@@ -181,7 +189,13 @@ static blk_status_t pmem_do_write(struct pmem_device *pmem,
flush_dcache_page(page);
write_pmem(pmem_addr, page, page_off, len);
if (unlikely(bad_pmem)) {
- rc = pmem_clear_poison(pmem, pmem_off, len);
+ /*
+ * Pass sector aligned offset and length. That seems
+ * to work as of now. Other finer grained alignment
+ * cases can be addressed later if need be.
+ */
+ rc = pmem_clear_poison(pmem, ALIGN(pmem_real_off, SECTOR_SIZE),
+ nr_sectors << SECTOR_SHIFT);
write_pmem(pmem_addr, page, page_off, len);
}
@@ -195,7 +209,7 @@ static blk_status_t pmem_do_bvec(struct pmem_device *pmem, struct page *page,
if (!op_is_write(op))
return pmem_do_read(pmem, page, off, sector, len);
- return pmem_do_write(pmem, page, off, sector, len);
+ return pmem_do_write(pmem, page, off, sector << SECTOR_SHIFT, len);
}
static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
--
2.20.1
--
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