[PATCH v2 3/5] dax: enable dax in the presence of known media errors (badblocks)
From: Vishal Verma <vishal.l.verma@intel.com>
Date: 2016-03-30 01:59:48
Also in:
linux-fsdevel, linux-mm, linux-xfs, lkml, nvdimm
Subsystem:
block layer, libnvdimm pmem: persistent memory driver, libnvdimm: non-volatile memory device subsystem, the rest · Maintainers:
Jens Axboe, Dan Williams, Vishal Verma, Dave Jiang, Ira Weiny, Linus Torvalds
From: Dan Williams <redacted> 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 <redacted> --- 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; }
--
2.5.5
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