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Date: Tue, 29 Mar 2016 19:59:48 -0600 From: Vishal Verma <vishal.l.verma@...el.com> To: linux-nvdimm@...ts.01.org Cc: Dan Williams <dan.j.williams@...el.com>, linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org, xfs@....sgi.com, linux-ext4@...r.kernel.org, linux-mm@...ck.org, Matthew Wilcox <matthew.r.wilcox@...el.com>, Ross Zwisler <ross.zwisler@...ux.intel.com>, Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>, Jens Axboe <axboe@...com>, Al Viro <viro@...iv.linux.org.uk>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, Christoph Hellwig <hch@...radead.org> Subject: [PATCH v2 3/5] dax: enable dax in the presence of known media errors (badblocks) From: Dan Williams <dan.j.williams@...el.com> 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 <dan.j.williams@...el.com> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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