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| author |   Mikulas Patocka <mpatocka@redhat.com> | 2020-08-24 11:09:47 -0400 |
|---|---|---|
| committer |   Mike Snitzer <snitzer@redhat.com> | 2020-09-01 16:41:55 -0400 |
| commit | f9e040efcc28309e5c592f7e79085a9a52e31f58 (patch) | |
| tree | ba83029d03adc0f497d2330e1e73b1693874f007 /drivers/md | |
| parent | Linux 5.9-rc3 (diff) | |
| download | wireguard-linux-f9e040efcc28309e5c592f7e79085a9a52e31f58.tar.xz wireguard-linux-f9e040efcc28309e5c592f7e79085a9a52e31f58.zip | |
dm writecache: handle DAX to partitions on persistent memory correctly
The function dax_direct_access doesn't take partitions into account,
it always maps pages from the beginning of the device. Therefore,
persistent_memory_claim() must get the partition offset using
get_start_sect() and add it to the page offsets passed to
dax_direct_access().
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: 48debafe4f2f ("dm: add writecache target")
Cc: stable@vger.kernel.org # 4.18+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-writecache.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c index 86dbe0c8b45c..6271d1e741cf 100644 --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -231,6 +231,7 @@ static int persistent_memory_claim(struct dm_writecache *wc) pfn_t pfn; int id; struct page **pages; + sector_t offset; wc->memory_vmapped = false; @@ -245,9 +246,16 @@ 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; @@ -269,7 +277,7 @@ 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; |