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| author | Dan Williams <dan.j.williams@intel.com> | 2016-01-06 12:03:42 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-01-09 22:42:31 -0800 |
| commit | 57f7f317abdd07954cb116280c88d18378afb33e (patch) | |
| tree | 8f39a9ea74d7babfbccfd0bcafc01e0e284499f4 /block | |
| parent | e10624f8c09710b3b0740ea3847627ea02f55c39 (diff) | |
| download | linux-stable-57f7f317abdd07954cb116280c88d18378afb33e.tar.gz linux-stable-57f7f317abdd07954cb116280c88d18378afb33e.tar.bz2 linux-stable-57f7f317abdd07954cb116280c88d18378afb33e.zip | |
pmem, dax: disable dax in the presence of bad blocks
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 <dan.j.williams@intel.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/ioctl.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/block/ioctl.c b/block/ioctl.c index 7a964d842913..2c84683aada5 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -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; } |