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-rw-r--r--drivers/md/dm-writecache.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index ed2f711c24c4..4e414b06192e 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -224,6 +224,7 @@ static int persistent_memory_claim(struct dm_writecache *wc)
pfn_t pfn;
int id;
struct page **pages;
+ sector_t offset;
wc->memory_vmapped = false;
@@ -242,9 +243,16 @@ static int persistent_memory_claim(struct dm_writecache *wc)
goto err1;
}
+ offset = get_start_sect(wc->ssd_dev->bdev);
+ if (offset & (PAGE_SIZE / 512 - 1)) {
+ r = -EINVAL;
+ goto err1;
+ }
+ offset >>= PAGE_SHIFT - 9;
+
id = dax_read_lock();
- da = dax_direct_access(wc->ssd_dev->dax_dev, 0, p, &wc->memory_map, &pfn);
+ da = dax_direct_access(wc->ssd_dev->dax_dev, offset, p, &wc->memory_map, &pfn);
if (da < 0) {
wc->memory_map = NULL;
r = da;
@@ -266,7 +274,7 @@ static int persistent_memory_claim(struct dm_writecache *wc)
i = 0;
do {
long daa;
- daa = dax_direct_access(wc->ssd_dev->dax_dev, i, p - i,
+ daa = dax_direct_access(wc->ssd_dev->dax_dev, offset + i, p - i,
NULL, &pfn);
if (daa <= 0) {
r = daa ? daa : -EINVAL;