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pmem, dax: disable dax in the presence of bad blocks

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Longer term teach dax to punch "error" holes in mapping requests and
deliver SIGBUS to applications that consume a bad pmem page.  For now,
simply disable the dax performance optimization in the presence of known
errors.

Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2016-01-06 12:03:42 -08:00
commit 57f7f317ab
2 changed files with 11 additions and 0 deletions
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10
block/ioctl.c
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@ -4,6 +4,7 @@
#include <linux/gfp.h>
#include <linux/blkpg.h>
#include <linux/hdreg.h>
#include <linux/badblocks.h>
#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/blktrace_api.h>
@ -422,6 +423,15 @@ 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;
}