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authorDan Williams <dan.j.williams@intel.com>2016-06-23 17:50:39 -0700
committerDan Williams <dan.j.williams@intel.com>2016-06-23 17:50:39 -0700
commit1ee6667cd8d183b2fed12f97285f184431d2caf9 (patch)
tree4982412cb9ffb7dfa82586d43f81b6c31bbf4831 /drivers/nvdimm
parent33688abb2802ff3a230bd2441f765477b94cc89e (diff)
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libnvdimm, pfn, dax: fix initialization vs autodetect for mode + alignment
The updated ndctl unit tests discovered that if a pfn configuration with a 4K alignment is read from the namespace, that alignment will be ignored in favor of the default 2M alignment. The result is that the configuration will fail initialization with a message like: dax6.1: bad offset: 0x22000 dax disabled align: 0x200000 Fix this by allowing the alignment read from the info block to override the default which is 2M not 0 in the autodetect path. This also fixes a similar problem with the mode and alignment settings silently being overwritten by the kernel when userspace has changed it. We now will either overwrite the info block if userspace changes the uuid or fail and warn if a live setting disagrees with the info block. Cc: <stable@vger.kernel.org> Cc: Micah Parrish <micah.parrish@hpe.com> Cc: Toshi Kani <toshi.kani@hpe.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r--drivers/nvdimm/pfn_devs.c51
1 files changed, 40 insertions, 11 deletions
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index f7718ec685fa..cea8350fbc7e 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -344,6 +344,8 @@ struct device *nd_pfn_create(struct nd_region *nd_region)
int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
{
u64 checksum, offset;
+ unsigned long align;
+ enum nd_pfn_mode mode;
struct nd_namespace_io *nsio;
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
struct nd_namespace_common *ndns = nd_pfn->ndns;
@@ -386,22 +388,50 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
return -ENXIO;
}
+ align = le32_to_cpu(pfn_sb->align);
+ offset = le64_to_cpu(pfn_sb->dataoff);
+ if (align == 0)
+ align = 1UL << ilog2(offset);
+ mode = le32_to_cpu(pfn_sb->mode);
+
if (!nd_pfn->uuid) {
- /* from probe we allocate */
+ /*
+ * When probing a namepace via nd_pfn_probe() the uuid
+ * is NULL (see: nd_pfn_devinit()) we init settings from
+ * pfn_sb
+ */
nd_pfn->uuid = kmemdup(pfn_sb->uuid, 16, GFP_KERNEL);
if (!nd_pfn->uuid)
return -ENOMEM;
+ nd_pfn->align = align;
+ nd_pfn->mode = mode;
} else {
- /* from init we validate */
+ /*
+ * When probing a pfn / dax instance we validate the
+ * live settings against the pfn_sb
+ */
if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0)
return -ENODEV;
+
+ /*
+ * If the uuid validates, but other settings mismatch
+ * return EINVAL because userspace has managed to change
+ * the configuration without specifying new
+ * identification.
+ */
+ if (nd_pfn->align != align || nd_pfn->mode != mode) {
+ dev_err(&nd_pfn->dev,
+ "init failed, settings mismatch\n");
+ dev_dbg(&nd_pfn->dev, "align: %lx:%lx mode: %d:%d\n",
+ nd_pfn->align, align, nd_pfn->mode,
+ mode);
+ return -EINVAL;
+ }
}
- if (nd_pfn->align == 0)
- nd_pfn->align = le32_to_cpu(pfn_sb->align);
- if (nd_pfn->align > nvdimm_namespace_capacity(ndns)) {
+ if (align > nvdimm_namespace_capacity(ndns)) {
dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n",
- nd_pfn->align, nvdimm_namespace_capacity(ndns));
+ align, nvdimm_namespace_capacity(ndns));
return -EINVAL;
}
@@ -411,7 +441,6 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
* namespace has changed since the pfn superblock was
* established.
*/
- offset = le64_to_cpu(pfn_sb->dataoff);
nsio = to_nd_namespace_io(&ndns->dev);
if (offset >= resource_size(&nsio->res)) {
dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
@@ -419,10 +448,11 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
return -EBUSY;
}
- if ((nd_pfn->align && !IS_ALIGNED(offset, nd_pfn->align))
+ if ((align && !IS_ALIGNED(offset, align))
|| !IS_ALIGNED(offset, PAGE_SIZE)) {
- dev_err(&nd_pfn->dev, "bad offset: %#llx dax disabled\n",
- offset);
+ dev_err(&nd_pfn->dev,
+ "bad offset: %#llx dax disabled align: %#lx\n",
+ offset, align);
return -ENXIO;
}
@@ -502,7 +532,6 @@ static struct vmem_altmap *__nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
res->start += start_pad;
res->end -= end_trunc;
- nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode);
if (nd_pfn->mode == PFN_MODE_RAM) {
if (offset < SZ_8K)
return ERR_PTR(-EINVAL);