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dax: enable dax in the presence of known media errors (badblocks)

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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.

Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
[vishal: fix a conflict with system RAM collision patches]
[vishal: add a 'size' parameter to ->direct_access]
[vishal: fix a conflict with DAX alignment check patches]
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
This commit is contained in:
Dan Williams
2016-02-24 14:02:11 -08:00
committed by Vishal Verma
parent 8b3db9798c
commit 0a70bd4305
6 changed files with 15 additions and 18 deletions
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13
fs/block_dev.c
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@@ -29,7 +29,6 @@
#include <linux/log2.h>
#include <linux/cleancache.h>
#include <linux/dax.h>
#include <linux/badblocks.h>
#include <asm/uaccess.h>
#include "internal.h"
@@ -501,7 +500,7 @@ long bdev_direct_access(struct block_device *bdev, struct blk_dax_ctl *dax)
sector += get_start_sect(bdev);
if (sector % (PAGE_SIZE / 512))
return -EINVAL;
avail = ops->direct_access(bdev, sector, &dax->addr, &dax->pfn);
avail = ops->direct_access(bdev, sector, &dax->addr, &dax->pfn, size);
if (!avail)
return -ERANGE;
if (avail > 0 && avail & ~PAGE_MASK)
@@ -561,7 +560,6 @@ EXPORT_SYMBOL_GPL(bdev_dax_supported);
*/
bool bdev_dax_capable(struct block_device *bdev)
{
struct gendisk *disk = bdev->bd_disk;
struct blk_dax_ctl dax = {
.size = PAGE_SIZE,
};
@@ -577,15 +575,6 @@ bool bdev_dax_capable(struct block_device *bdev)
if (bdev_direct_access(bdev, &dax) < 0)
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;
}