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authorAruna Balakrishnaiah <aruna@linux.vnet.ibm.com>2013-08-16 22:57:51 +0200
committerTony Luck <tony.luck@intel.com>2013-08-19 20:53:45 +0200
commitf8c62f34fe868f5bcca88a32e4a5c52b67de661d (patch)
tree450799c8e36e38739004d263babc2b69514b82c6 /drivers/firmware/efi
parenterst: Read and write to the 'compressed' flag of pstore (diff)
downloadlinux-f8c62f34fe868f5bcca88a32e4a5c52b67de661d.tar.xz
linux-f8c62f34fe868f5bcca88a32e4a5c52b67de661d.zip
efi-pstore: Read and write to the 'compressed' flag of pstore
In pstore write, Efi will add a character 'C'(compressed) or D'(decompressed) in its header while writing to persistent store. In pstore read, read the header and update the 'compressed' flag accordingly. Signed-off-by: Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'drivers/firmware/efi')
-rw-r--r--drivers/firmware/efi/efi-pstore.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
index 9a5425f3f885..5002d50e3781 100644
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -35,6 +35,7 @@ struct pstore_read_data {
enum pstore_type_id *type;
int *count;
struct timespec *timespec;
+ bool *compressed;
char **buf;
};
@@ -42,7 +43,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
{
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
struct pstore_read_data *cb_data = data;
- char name[DUMP_NAME_LEN];
+ char name[DUMP_NAME_LEN], data_type;
int i;
int cnt;
unsigned int part;
@@ -54,12 +55,23 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
for (i = 0; i < DUMP_NAME_LEN; i++)
name[i] = entry->var.VariableName[i];
- if (sscanf(name, "dump-type%u-%u-%d-%lu",
+ if (sscanf(name, "dump-type%u-%u-%d-%lu-%c",
+ cb_data->type, &part, &cnt, &time, &data_type) == 5) {
+ *cb_data->id = part;
+ *cb_data->count = cnt;
+ cb_data->timespec->tv_sec = time;
+ cb_data->timespec->tv_nsec = 0;
+ if (data_type == 'C')
+ *cb_data->compressed = true;
+ else
+ *cb_data->compressed = false;
+ } else if (sscanf(name, "dump-type%u-%u-%d-%lu",
cb_data->type, &part, &cnt, &time) == 4) {
*cb_data->id = part;
*cb_data->count = cnt;
cb_data->timespec->tv_sec = time;
cb_data->timespec->tv_nsec = 0;
+ *cb_data->compressed = false;
} else if (sscanf(name, "dump-type%u-%u-%lu",
cb_data->type, &part, &time) == 3) {
/*
@@ -71,6 +83,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
*cb_data->count = 0;
cb_data->timespec->tv_sec = time;
cb_data->timespec->tv_nsec = 0;
+ *cb_data->compressed = false;
} else
return 0;
@@ -96,6 +109,7 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
data.type = type;
data.count = count;
data.timespec = timespec;
+ data.compressed = compressed;
data.buf = buf;
return __efivar_entry_iter(efi_pstore_read_func, &efivar_sysfs_list, &data,
@@ -112,8 +126,8 @@ static int efi_pstore_write(enum pstore_type_id type,
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
int i, ret = 0;
- sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count,
- get_seconds());
+ sprintf(name, "dump-type%u-%u-%d-%lu-%c", type, part, count,
+ get_seconds(), compressed ? 'C' : 'D');
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = name[i];