Messages in this thread Patch in this message | | | From | Seiji Aguchi <> | Subject | [RESEND][PATCH v4 7/7] Add a format check for an existing variable name at erasing time | Date | Thu, 1 Nov 2012 23:03:04 +0000 |
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[Issue]
a format of variable name has been updated to type, id, count and ctime to support holding multiple logs.
Format of current variable name dump-type0-1-2-12345678
type:0 id:1 count:2 ctime:12345678
On the other hand, if an old variable name before being updated remains, users can't erase it via /dev/pstore.
Format of old variable name dump-type0-1-12345678
type:0 id:1 ctime:12345678
[Solution]
This patch add a format check for the old variable name in a erase callback to make it erasable.
Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> --- drivers/firmware/efivars.c | 20 ++++++++++++++++++-- 1 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c index bf7a6f9..6e51c1e 100644 --- a/drivers/firmware/efivars.c +++ b/drivers/firmware/efivars.c @@ -773,6 +773,8 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, { char name[DUMP_NAME_LEN]; efi_char16_t efi_name[DUMP_NAME_LEN]; + char name_old[DUMP_NAME_LEN]; + efi_char16_t efi_name_old[DUMP_NAME_LEN]; efi_guid_t vendor = LINUX_EFI_CRASH_GUID; struct efivars *efivars = psi->data; struct efivar_entry *entry, *found = NULL; @@ -796,8 +798,22 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, if (efi_guidcmp(entry->var.VendorGuid, vendor)) continue; if (utf16_strncmp(entry->var.VariableName, efi_name, - utf16_strlen(efi_name))) - continue; + utf16_strlen(efi_name))) { + /* + * Check if an old format, + * which doesn't support holding + * multiple logs, remains. + */ + sprintf(name_old, "dump-type%u-%u-%lu", type, + (unsigned int)id, time.tv_sec); + + for (i = 0; i < DUMP_NAME_LEN; i++) + efi_name_old[i] = name_old[i]; + + if (utf16_strncmp(entry->var.VariableName, efi_name_old, + utf16_strlen(efi_name_old))) + continue; + } /* found */ found = entry; -- 1.7.1
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