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| author | Dan Williams <dan.j.williams@intel.com> | 2016-07-19 16:17:58 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-08-23 22:58:52 -0700 |
| commit | 9d2d01a031a945075d4609b1c4d3c73f10ba61e7 (patch) | |
| tree | 45743da7f0fdffa1c1f43920d0cf5cf94737af6b /drivers/dax | |
| parent | 9dc1e4927bfabaf654738c9ecca3a4926a0aaeb5 (diff) | |
| download | linux-9d2d01a031a945075d4609b1c4d3c73f10ba61e7.tar.gz linux-9d2d01a031a945075d4609b1c4d3c73f10ba61e7.tar.bz2 linux-9d2d01a031a945075d4609b1c4d3c73f10ba61e7.zip | |
dax: check resource alignment at dax region/device create
All the extents of a dax-device must match the alignment of the region.
Otherwise, we are unable to guarantee fault semantics of a given page
size. The region must be self-consistent itself as well.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
| -rw-r--r-- | drivers/dax/dax.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c index 0a7899d5c65c..03bb54f7f58f 100644 --- a/drivers/dax/dax.c +++ b/drivers/dax/dax.c @@ -206,8 +206,11 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id, { struct dax_region *dax_region; - dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL); + if (!IS_ALIGNED(res->start, align) + || !IS_ALIGNED(resource_size(res), align)) + return NULL; + dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL); if (!dax_region) return NULL; @@ -560,15 +563,29 @@ int devm_create_dax_dev(struct dax_region *dax_region, struct resource *res, { struct device *parent = dax_region->dev; struct dax_dev *dax_dev; + int rc = 0, minor, i; struct device *dev; struct cdev *cdev; - int rc, minor; dev_t dev_t; dax_dev = kzalloc(sizeof(*dax_dev) + sizeof(*res) * count, GFP_KERNEL); if (!dax_dev) return -ENOMEM; + for (i = 0; i < count; i++) { + if (!IS_ALIGNED(res[i].start, dax_region->align) + || !IS_ALIGNED(resource_size(&res[i]), + dax_region->align)) { + rc = -EINVAL; + break; + } + dax_dev->res[i].start = res[i].start; + dax_dev->res[i].end = res[i].end; + } + + if (i < count) + goto err_id; + dax_dev->id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL); if (dax_dev->id < 0) { rc = dax_dev->id; @@ -601,7 +618,6 @@ int devm_create_dax_dev(struct dax_region *dax_region, struct resource *res, goto err_cdev; /* from here on we're committed to teardown via dax_dev_release() */ - memcpy(dax_dev->res, res, sizeof(*res) * count); dax_dev->num_resources = count; dax_dev->alive = true; dax_dev->region = dax_region; |