Vishal Verma <[email protected]> writes: > From: Dan Williams <[email protected]> > > 1/ If a mapping overlaps a bad sector fail the request. > > 2/ Do not opportunistically report more dax-capable capacity than is > requested when errors present. > > [vishal: fix a conflict with system RAM collision patches] > Signed-off-by: Dan Williams <[email protected]>
Reviewed-by: Jeff Moyer <[email protected]> > --- > block/ioctl.c | 9 --------- > drivers/nvdimm/pmem.c | 8 ++++++++ > 2 files changed, 8 insertions(+), 9 deletions(-) > > diff --git a/block/ioctl.c b/block/ioctl.c > index d8996bb..cd7f392 100644 > --- a/block/ioctl.c > +++ b/block/ioctl.c > @@ -423,15 +423,6 @@ bool blkdev_dax_capable(struct block_device *bdev) > || (bdev->bd_part->nr_sects % (PAGE_SIZE / 512))) > return false; > > - /* > - * If the device has known bad blocks, force all I/O through the > - * driver / page cache. > - * > - * TODO: support finer grained dax error handling > - */ > - if (disk->bb && disk->bb->count) > - return false; > - > return true; > } > #endif > diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c > index da10554..eac5f93 100644 > --- a/drivers/nvdimm/pmem.c > +++ b/drivers/nvdimm/pmem.c > @@ -174,9 +174,17 @@ static long pmem_direct_access(struct block_device *bdev, > struct pmem_device *pmem = bdev->bd_disk->private_data; > resource_size_t offset = sector * 512 + pmem->data_offset; > > + if (unlikely(is_bad_pmem(&pmem->bb, sector, dax->size))) > + return -EIO; > dax->addr = pmem->virt_addr + offset; > dax->pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); > > + /* > + * If badblocks are present, limit known good range to the > + * requested range. > + */ > + if (unlikely(pmem->bb.count)) > + return dax->size; > return pmem->size - pmem->pfn_pad - offset; > }
