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Subject[PATCH] pstore: pass reason to backend write callback
This allows a backend to filter on the dmesg reason as well as the pstore
reason. When ramoops is switched to pstore, this is needed since it has
no interest in storing non-crash dmesg details.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/acpi/apei/erst.c | 6 ++++--
drivers/firmware/efivars.c | 8 +++++---
fs/pstore/platform.c | 9 +++++----
include/linux/pstore.h | 12 +++++++++---
4 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index b8b97d6..76d0f84 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -934,7 +934,8 @@ static int erst_close_pstore(struct pstore_info *psi);
static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
struct timespec *time, char **buf,
struct pstore_info *psi);
-static int erst_writer(enum pstore_type_id type, u64 *id, unsigned int part,
+static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,
+ u64 *id, unsigned int part,
size_t size, struct pstore_info *psi);
static int erst_clearer(enum pstore_type_id type, u64 id,
struct pstore_info *psi);
@@ -1051,7 +1052,8 @@ out:
return (rc < 0) ? rc : (len - sizeof(*rcd));
}

-static int erst_writer(enum pstore_type_id type, u64 *id, unsigned int part,
+static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,
+ u64 *id, unsigned int part,
size_t size, struct pstore_info *psi)
{
struct cper_pstore_record *rcd = (struct cper_pstore_record *)
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index a54a6b9..0a53a05 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -495,7 +495,8 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
return 0;
}

-static int efi_pstore_write(enum pstore_type_id type, u64 *id,
+static int efi_pstore_write(enum pstore_type_id type,
+ enum kmsg_dump_reason reason, u64 *id,
unsigned int part, size_t size, struct pstore_info *psi)
{
char name[DUMP_NAME_LEN];
@@ -565,7 +566,7 @@ static int efi_pstore_write(enum pstore_type_id type, u64 *id,
static int efi_pstore_erase(enum pstore_type_id type, u64 id,
struct pstore_info *psi)
{
- efi_pstore_write(type, &id, (unsigned int)id, 0, psi);
+ efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi);

return 0;
}
@@ -586,7 +587,8 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
return -1;
}

-static int efi_pstore_write(enum pstore_type_id type, u64 *id,
+static int efi_pstore_write(enum pstore_type_id type,
+ enum kmsg_dump_reason reason, u64 *id,
unsigned int part, size_t size, struct pstore_info *psi)
{
return 0;
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index c09cbb4..2454dbe 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -122,7 +122,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
memcpy(dst, s1 + s1_start, l1_cpy);
memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);

- ret = psinfo->write(PSTORE_TYPE_DMESG, &id, part,
+ ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,
hsize + l1_cpy + l2_cpy, psinfo);
if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())
pstore_new_entry = 1;
@@ -244,7 +244,8 @@ static void pstore_timefunc(unsigned long dummy)
* Call platform driver to write a record to the
* persistent store.
*/
-int pstore_write(enum pstore_type_id type, char *buf, size_t size)
+int pstore_write(enum pstore_type_id type, enum kmsg_dump_reason reason,
+ char *buf, size_t size)
{
u64 id;
int ret;
@@ -258,10 +259,10 @@ int pstore_write(enum pstore_type_id type, char *buf, size_t size)

spin_lock_irqsave(&psinfo->buf_lock, flags);
memcpy(psinfo->buf, buf, size);
- ret = psinfo->write(type, &id, 0, size, psinfo);
+ ret = psinfo->write(type, reason, &id, 0, size, psinfo);
spin_unlock_irqrestore(&psinfo->buf_lock, flags);
if (ret == 0 && pstore_is_mounted())
- pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id, buf,
+ pstore_mkfile(type, psinfo->name, id, buf,
size, CURRENT_TIME, psinfo);

return 0;
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index 781cf43..dabf5eb 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -22,6 +22,9 @@
#ifndef _LINUX_PSTORE_H
#define _LINUX_PSTORE_H

+#include <linux/time.h>
+#include <linux/kmsg_dump.h>
+
/* types */
enum pstore_type_id {
PSTORE_TYPE_DMESG = 0,
@@ -40,7 +43,8 @@ struct pstore_info {
ssize_t (*read)(u64 *id, enum pstore_type_id *type,
struct timespec *time, char **buf,
struct pstore_info *psi);
- int (*write)(enum pstore_type_id type, u64 *id,
+ int (*write)(enum pstore_type_id type,
+ enum kmsg_dump_reason reason, u64 *id,
unsigned int part, size_t size, struct pstore_info *psi);
int (*erase)(enum pstore_type_id type, u64 id,
struct pstore_info *psi);
@@ -49,7 +53,8 @@ struct pstore_info {

#ifdef CONFIG_PSTORE
extern int pstore_register(struct pstore_info *);
-extern int pstore_write(enum pstore_type_id type, char *buf, size_t size);
+extern int pstore_write(enum pstore_type_id type, enum kmsg_dump_reason reason,
+ char *buf, size_t size);
#else
static inline int
pstore_register(struct pstore_info *psi)
@@ -57,7 +62,8 @@ pstore_register(struct pstore_info *psi)
return -ENODEV;
}
static inline int
-pstore_write(enum pstore_type_id type, char *buf, size_t size)
+pstore_write(enum pstore_type_id type, enum kmsg_dump_reason reason,
+ char *buf, size_t size)
{
return -ENODEV;
}
--
1.7.0.4


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