Pstore fs expects that backends provide a uniqued id which could avoid
pstore making entries as duplication or denominating entries the same
name. So I combine the timestamp, part and count into id.
Signed-off-by: Madper Xie <cxie@xxxxxxxxxx>
---
drivers/firmware/efi/efi-pstore.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
index 5002d50..0de9179 100644
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -39,6 +39,17 @@ struct pstore_read_data {
char **buf;
};
+static u64 efi_generate_id(unsigned long timestamp, unsigned int part, int count)
+{
+ char id_str[64];
+ u64 id = 0;
+
+ sprintf(id_str, "%lu%u%d", timestamp, part, count);
+ if (kstrtoull(id_str, 10, &id))
+ pr_warn("efi-pstore: failed to generate id\n");
+ return id;
+}
+
static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
{
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
@@ -57,17 +68,18 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
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->id = efi_generate_id(time, part, cnt);
*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->id = efi_generate_id(time, part, cnt);
*cb_data->count = cnt;
cb_data->timespec->tv_sec = time;
cb_data->timespec->tv_nsec = 0;
@@ -79,7 +91,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
* which doesn't support holding
* multiple logs, remains.
*/
- *cb_data->id = part;
+ *cb_data->id = efi_generate_id(time, part, 0);
*cb_data->count = 0;
cb_data->timespec->tv_sec = time;
cb_data->timespec->tv_nsec = 0;
@@ -125,9 +137,11 @@ static int efi_pstore_write(enum pstore_type_id type,
efi_char16_t efi_name[DUMP_NAME_LEN];
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
int i, ret = 0;
+ unsigned long timestamp;
+ timestamp = get_seconds();
sprintf(name, "dump-type%u-%u-%d-%lu-%c", type, part, count,
- get_seconds(), compressed ? 'C' : 'D');
+ timestamp, compressed ? 'C' : 'D');
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = name[i];
--
1.8.4.2
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