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libnvdimm/pfn_dev: Add page size and struct page size to pfn superblock 

This is needed so that pmem probe don't wrongly initialize a namespace
which doesn't have enough space reserved for holding struct pages
with the current kernel.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/20190905154603.10349-5-aneesh.kumar@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Aneesh Kumar K.V 2019-09-05 21:16:00 +05:30 committed by Dan Williams
parent e96f0bf2ec
commit edbb52c244
2 changed files with 28 additions and 2 deletions
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5
drivers/nvdimm/pfn.h
View File

@ -29,7 +29,10 @@ struct nd_pfn_sb {
/* minor-version-2 record the base alignment of the mapping */ /* minor-version-2 record the base alignment of the mapping */
__le32 align; __le32 align;
/* minor-version-3 guarantee the padding and flags are zero */ /* minor-version-3 guarantee the padding and flags are zero */
u8 padding[4000]; /* minor-version-4 record the page size and struct page size */
__le32 page_size;
__le16 page_struct_size;
u8 padding[3994];
__le64 checksum; __le64 checksum;
}; };

25
drivers/nvdimm/pfn_devs.c
View File

@ -460,6 +460,11 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
if (__le16_to_cpu(pfn_sb->version_minor) < 2) if (__le16_to_cpu(pfn_sb->version_minor) < 2)
pfn_sb->align = 0; pfn_sb->align = 0;
if (__le16_to_cpu(pfn_sb->version_minor) < 4) {
pfn_sb->page_struct_size = cpu_to_le16(64);
pfn_sb->page_size = cpu_to_le32(PAGE_SIZE);
}
switch (le32_to_cpu(pfn_sb->mode)) { switch (le32_to_cpu(pfn_sb->mode)) {
case PFN_MODE_RAM: case PFN_MODE_RAM:
case PFN_MODE_PMEM: case PFN_MODE_PMEM:
@ -475,6 +480,22 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
align = 1UL << ilog2(offset); align = 1UL << ilog2(offset);
mode = le32_to_cpu(pfn_sb->mode); mode = le32_to_cpu(pfn_sb->mode);
if ((le32_to_cpu(pfn_sb->page_size) > PAGE_SIZE) &&
(mode == PFN_MODE_PMEM)) {
dev_err(&nd_pfn->dev,
"init failed, page size mismatch %d\n",
le32_to_cpu(pfn_sb->page_size));
return -EOPNOTSUPP;
}
if ((le16_to_cpu(pfn_sb->page_struct_size) < sizeof(struct page)) &&
(mode == PFN_MODE_PMEM)) {
dev_err(&nd_pfn->dev,
"init failed, struct page size mismatch %d\n",
le16_to_cpu(pfn_sb->page_struct_size));
return -EOPNOTSUPP;
}
if (!nd_pfn->uuid) { if (!nd_pfn->uuid) {
/* /*
* When probing a namepace via nd_pfn_probe() the uuid * When probing a namepace via nd_pfn_probe() the uuid
@ -730,8 +751,10 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
memcpy(pfn_sb->uuid, nd_pfn->uuid, 16); memcpy(pfn_sb->uuid, nd_pfn->uuid, 16);
memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16); memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16);
pfn_sb->version_major = cpu_to_le16(1); pfn_sb->version_major = cpu_to_le16(1);
pfn_sb->version_minor = cpu_to_le16(3); pfn_sb->version_minor = cpu_to_le16(4);
pfn_sb->align = cpu_to_le32(nd_pfn->align); pfn_sb->align = cpu_to_le32(nd_pfn->align);
pfn_sb->page_struct_size = cpu_to_le16(MAX_STRUCT_PAGE_SIZE);
pfn_sb->page_size = cpu_to_le32(PAGE_SIZE);
checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb); checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
pfn_sb->checksum = cpu_to_le64(checksum); pfn_sb->checksum = cpu_to_le64(checksum);