diff options
| -rw-r--r-- | drivers/nvdimm/btt.c | 2 | ||||
| -rw-r--r-- | drivers/nvdimm/btt_devs.c | 15 | ||||
| -rw-r--r-- | drivers/nvdimm/namespace_devs.c | 20 | ||||
| -rw-r--r-- | drivers/nvdimm/nd.h | 1 |
4 files changed, 37 insertions, 1 deletions
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c index 6567746aa315..19588291550b 100644 --- a/drivers/nvdimm/btt.c +++ b/drivers/nvdimm/btt.c @@ -733,6 +733,7 @@ static int btt_arena_write_layout(struct arena_info *arena) int ret; struct btt_sb *super; struct nd_btt *nd_btt = arena->nd_btt; + const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev); ret = btt_map_init(arena); if (ret) @@ -748,6 +749,7 @@ static int btt_arena_write_layout(struct arena_info *arena) strncpy(super->signature, BTT_SIG, BTT_SIG_LEN); memcpy(super->uuid, nd_btt->uuid, 16); + memcpy(super->parent_uuid, parent_uuid, 16); super->flags = cpu_to_le32(arena->flags); super->version_major = cpu_to_le16(arena->version_major); super->version_minor = cpu_to_le16(arena->version_minor); diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c index 18e0663e922c..242ae1c550ad 100644 --- a/drivers/nvdimm/btt_devs.c +++ b/drivers/nvdimm/btt_devs.c @@ -342,24 +342,37 @@ struct device *nd_btt_create(struct nd_region *nd_region) return dev; } +static bool uuid_is_null(u8 *uuid) +{ + static const u8 null_uuid[16]; + + return (memcmp(uuid, null_uuid, 16) == 0); +} + /** * nd_btt_arena_is_valid - check if the metadata layout is valid * @nd_btt: device with BTT geometry and backing device info * @super: pointer to the arena's info block being tested * * Check consistency of the btt info block with itself by validating - * the checksum. + * the checksum, and with the parent namespace by verifying the + * parent_uuid contained in the info block with the one supplied in. * * Returns: * false for an invalid info block, true for a valid one */ bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super) { + const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev); u64 checksum; if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0) return false; + if (!uuid_is_null(super->parent_uuid)) + if (memcmp(super->parent_uuid, parent_uuid, 16) != 0) + return false; + checksum = le64_to_cpu(super->checksum); super->checksum = 0; if (checksum != nd_btt_sb_checksum(super)) diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index fef0dd80d4ad..b18ffea9d85b 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -100,6 +100,26 @@ const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns, } EXPORT_SYMBOL(nvdimm_namespace_disk_name); +const u8 *nd_dev_to_uuid(struct device *dev) +{ + static const u8 null_uuid[16]; + + if (!dev) + return null_uuid; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + return nspm->uuid; + } else if (is_namespace_blk(dev)) { + struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); + + return nsblk->uuid; + } else + return null_uuid; +} +EXPORT_SYMBOL(nd_dev_to_uuid); + static ssize_t nstype_show(struct device *dev, struct device_attribute *attr, char *buf) { diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h index 835263e47bb8..f9615824947b 100644 --- a/drivers/nvdimm/nd.h +++ b/drivers/nvdimm/nd.h @@ -217,4 +217,5 @@ static inline bool nd_iostat_start(struct bio *bio, unsigned long *start) } void nd_iostat_end(struct bio *bio, unsigned long start); resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk); +const u8 *nd_dev_to_uuid(struct device *dev); #endif /* __ND_H__ */ |