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Date: Wed, 16 Nov 2011 10:59:34 +0800
From: Chen Gong <gong.chen@...ux.intel.com>
To: Kees Cook <keescook@...omium.org>
CC: linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
Matthew Garrett <mjg@...hat.com>
Subject: Re: [PATCH] pstore: pass reason to backend write callback
δΊ 2011/11/15 7:29, Kees Cook ει:
> 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@...omium.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;
> }
We ever talked about it here: https://lkml.org/lkml/2011/9/20/468.
Matthew's patch is good enough if pstore_write can be cleaned.
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