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author | Vishal Verma <vishal.l.verma@intel.com> | 2015-07-29 20:58:08 (GMT) |
---|---|---|
committer | Dan Williams <dan.j.williams@intel.com> | 2015-08-14 17:43:04 (GMT) |
commit | ab45e7632717b811e0786e46ca5ad279cb731b66 (patch) | |
tree | 84a669c9fb6c9889ba7b17976acf5b50c08bbd54 /drivers/nvdimm | |
parent | fbde1414acc0440024083bf0c391b259bcfc4826 (diff) | |
download | linux-ab45e7632717b811e0786e46ca5ad279cb731b66.tar.xz |
libnvdimm, btt: consolidate arena validation
Use arena_is_valid as a common routine for checking the validity of an
info block from both discover_arenas, and nd_btt_probe.
As a result, don't check for validity of the BTT's UUID, and lbasize.
The checksum in the BTT info block guarantees self-consistency, and when
we're called from nd_btt_probe, we don't have a valid uuid or lbasize
available to check against.
Also cleanup to return a bool instead of an int.
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r-- | drivers/nvdimm/btt.c | 28 | ||||
-rw-r--r-- | drivers/nvdimm/btt.h | 3 | ||||
-rw-r--r-- | drivers/nvdimm/btt_devs.c | 42 |
3 files changed, 37 insertions, 36 deletions
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c index 87e6a96..6567746 100644 --- a/drivers/nvdimm/btt.c +++ b/drivers/nvdimm/btt.c @@ -583,32 +583,6 @@ static void free_arenas(struct btt *btt) } /* - * This function checks if the metadata layout is valid and error free - */ -static int arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super) -{ - u64 checksum; - - if (memcmp(super->uuid, nd_btt->uuid, 16)) - return 0; - - checksum = le64_to_cpu(super->checksum); - super->checksum = 0; - if (checksum != nd_btt_sb_checksum(super)) - return 0; - super->checksum = cpu_to_le64(checksum); - - if (nd_btt->lbasize != le32_to_cpu(super->external_lbasize)) - return 0; - - /* TODO: figure out action for this */ - if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0) - dev_info(&nd_btt->dev, "Found arena with an error flag\n"); - - return 1; -} - -/* * This function reads an existing valid btt superblock and * populates the corresponding arena_info struct */ @@ -665,7 +639,7 @@ static int discover_arenas(struct btt *btt) if (ret) goto out; - if (!arena_is_valid(btt->nd_btt, super)) { + if (!nd_btt_arena_is_valid(btt->nd_btt, super)) { if (remaining == btt->rawsize) { btt->init_state = INIT_NOTFOUND; dev_info(to_dev(arena), "No existing arenas\n"); diff --git a/drivers/nvdimm/btt.h b/drivers/nvdimm/btt.h index 75b0d80..b2f8651 100644 --- a/drivers/nvdimm/btt.h +++ b/drivers/nvdimm/btt.h @@ -182,4 +182,7 @@ struct btt { int init_state; int num_arenas; }; + +bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super); + #endif diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c index 6ac8c0f..18e0663 100644 --- a/drivers/nvdimm/btt_devs.c +++ b/drivers/nvdimm/btt_devs.c @@ -342,6 +342,38 @@ struct device *nd_btt_create(struct nd_region *nd_region) return dev; } +/** + * 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. + * + * 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) +{ + u64 checksum; + + if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0) + return false; + + checksum = le64_to_cpu(super->checksum); + super->checksum = 0; + if (checksum != nd_btt_sb_checksum(super)) + return false; + super->checksum = cpu_to_le64(checksum); + + /* TODO: figure out action for this */ + if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0) + dev_info(&nd_btt->dev, "Found arena with an error flag\n"); + + return true; +} +EXPORT_SYMBOL(nd_btt_arena_is_valid); + /* * nd_btt_sb_checksum: compute checksum for btt info block * @@ -364,8 +396,6 @@ EXPORT_SYMBOL(nd_btt_sb_checksum); static int __nd_btt_probe(struct nd_btt *nd_btt, struct nd_namespace_common *ndns, struct btt_sb *btt_sb) { - u64 checksum; - if (!btt_sb || !ndns || !nd_btt) return -ENODEV; @@ -375,14 +405,8 @@ static int __nd_btt_probe(struct nd_btt *nd_btt, if (nvdimm_namespace_capacity(ndns) < SZ_16M) return -ENXIO; - if (memcmp(btt_sb->signature, BTT_SIG, BTT_SIG_LEN) != 0) - return -ENODEV; - - checksum = le64_to_cpu(btt_sb->checksum); - btt_sb->checksum = 0; - if (checksum != nd_btt_sb_checksum(btt_sb)) + if (!nd_btt_arena_is_valid(nd_btt, btt_sb)) return -ENODEV; - btt_sb->checksum = cpu_to_le64(checksum); nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize); nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL); |