Add a new field to pstore_info that passes information about kmesg dump
maximum reason.
This allows a finer control of what kmesg dumps are stored on pstore
device.
Those clients that do not explicitly set this field (keep it equal to 0),
get the default behavior: dump only Oops and Panics, and dump everything
if printk.always_kmsg_dump is provided.
Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
---
fs/pstore/platform.c | 4 +++-
include/linux/pstore.h | 3 +++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 408277ee3cdb..75bf8a43f92a 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -602,8 +602,10 @@ int pstore_register(struct pstore_info *psi)
if (pstore_is_mounted())
pstore_get_records(0);
- if (psi->flags & PSTORE_FLAGS_DMESG)
+ if (psi->flags & PSTORE_FLAGS_DMESG) {
+ pstore_dumper.max_reason = psinfo->max_reason;
pstore_register_kmsg();
+ }
if (psi->flags & PSTORE_FLAGS_CONSOLE)
pstore_register_console();
if (psi->flags & PSTORE_FLAGS_FTRACE)
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index e779441e6d26..45ae424bfeb5 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -97,6 +97,8 @@ struct pstore_record {
* @read_mutex: serializes @open, @read, @close, and @erase callbacks
* @flags: bitfield of frontends the backend can accept writes for
* @data: backend-private pointer passed back during callbacks
+ * @max_reason: Used when PSTORE_FLAGS_DMESG is set. Contains the
+ * kmsg_dump_reason enum value.
*
* Callbacks:
*
@@ -180,6 +182,7 @@ struct pstore_info {
int flags;
void *data;
+ int max_reason;
int (*open)(struct pstore_info *psi);
int (*close)(struct pstore_info *psi);
--
2.25.1
