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Message-Id: <1488837332-71582-16-git-send-email-keescook@chromium.org>
Date: Mon, 6 Mar 2017 13:55:29 -0800
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
Nobuhiro Iwamatsu <nobuhiro.iwamatsu.kw@...achi.com>,
Qiuxu Zhuo <qiuxu.zhuo@...el.com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Anton Vorontsov <anton@...msg.org>,
Colin Cross <ccross@...roid.com>,
Tony Luck <tony.luck@...el.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Len Brown <lenb@...nel.org>,
Matt Fleming <matt@...eblueprint.co.uk>,
Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>,
Daniel Axtens <dja@...ens.net>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Geliang Tang <geliangtang@....com>,
linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
linux-efi@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH 15/18] pstore: Replace arguments for erase() API
This removes the argument list for the erase() callback and replaces it
with a pointer to the backend record details to be removed.
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/acpi/apei/erst.c | 8 +++-----
drivers/firmware/efi/efi-pstore.c | 26 +++++++++++---------------
fs/pstore/inode.c | 12 +++++-------
fs/pstore/ram.c | 15 +++++++--------
include/linux/pstore.h | 16 +++++-----------
5 files changed, 31 insertions(+), 46 deletions(-)
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index 440588d189e7..7207e5fc9d3d 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -927,8 +927,7 @@ static int erst_open_pstore(struct pstore_info *psi);
static int erst_close_pstore(struct pstore_info *psi);
static ssize_t erst_reader(struct pstore_record *record);
static int erst_writer(struct pstore_record *record);
-static int erst_clearer(enum pstore_type_id type, u64 id, int count,
- struct timespec time, struct pstore_info *psi);
+static int erst_clearer(struct pstore_record *record);
static struct pstore_info erst_info = {
.owner = THIS_MODULE,
@@ -1100,10 +1099,9 @@ static int erst_writer(struct pstore_record *record)
return ret;
}
-static int erst_clearer(enum pstore_type_id type, u64 id, int count,
- struct timespec time, struct pstore_info *psi)
+static int erst_clearer(struct pstore_record *record)
{
- return erst_clear(id);
+ return erst_clear(record->id);
}
static int __init erst_init(void)
diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
index f81e3ec6f1c0..93d8cdbe7ef4 100644
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -266,10 +266,7 @@ static int efi_pstore_write(struct pstore_record *record)
};
struct pstore_erase_data {
- u64 id;
- enum pstore_type_id type;
- int count;
- struct timespec time;
+ struct pstore_record *record;
efi_char16_t *name;
};
@@ -295,8 +292,9 @@ static int efi_pstore_erase_func(struct efivar_entry *entry, void *data)
* Check if an old format, which doesn't support
* holding multiple logs, remains.
*/
- sprintf(name_old, "dump-type%u-%u-%lu", ed->type,
- (unsigned int)ed->id, ed->time.tv_sec);
+ snprintf(name_old, sizeof(name_old), "dump-type%u-%u-%lu",
+ ed->record->type, (unsigned int)ed->record->id,
+ ed->record->time.tv_sec);
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name_old[i] = name_old[i];
@@ -321,8 +319,7 @@ static int efi_pstore_erase_func(struct efivar_entry *entry, void *data)
return 1;
}
-static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
- struct timespec time, struct pstore_info *psi)
+static int efi_pstore_erase(struct pstore_record *record)
{
struct pstore_erase_data edata;
struct efivar_entry *entry = NULL;
@@ -331,17 +328,16 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
int found, i;
unsigned int part;
- do_div(id, 1000);
- part = do_div(id, 100);
- sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count, time.tv_sec);
+ do_div(record->id, 1000);
+ part = do_div(record->id, 100);
+ snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lu",
+ record->type, record->part, record->count,
+ record->time.tv_sec);
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = name[i];
- edata.id = part;
- edata.type = type;
- edata.count = count;
- edata.time = time;
+ edata.record = record;
edata.name = efi_name;
if (efivar_entry_iter_begin())
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 0ea281b457fa..06504b69575b 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -210,14 +210,12 @@ static int pstore_unlink(struct inode *dir, struct dentry *dentry)
if (err)
return err;
- if (record->psi->erase) {
- mutex_lock(&record->psi->read_mutex);
- record->psi->erase(record->type, record->id, record->count,
- d_inode(dentry)->i_ctime, record->psi);
- mutex_unlock(&record->psi->read_mutex);
- } else {
+ if (!record->psi->erase)
return -EPERM;
- }
+
+ mutex_lock(&record->psi->read_mutex);
+ record->psi->erase(record);
+ mutex_unlock(&record->psi->read_mutex);
return simple_unlink(dir, dentry);
}
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index ca6e2a814e37..a18575fe32e9 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -469,25 +469,24 @@ static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type,
return -EINVAL;
}
-static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
- struct timespec time, struct pstore_info *psi)
+static int ramoops_pstore_erase(struct pstore_record *record)
{
- struct ramoops_context *cxt = psi->data;
+ struct ramoops_context *cxt = record->psi->data;
struct persistent_ram_zone *prz;
- switch (type) {
+ switch (record->type) {
case PSTORE_TYPE_DMESG:
- if (id >= cxt->max_dump_cnt)
+ if (record->id >= cxt->max_dump_cnt)
return -EINVAL;
- prz = cxt->dprzs[id];
+ prz = cxt->dprzs[record->id];
break;
case PSTORE_TYPE_CONSOLE:
prz = cxt->cprz;
break;
case PSTORE_TYPE_FTRACE:
- if (id >= cxt->max_ftrace_cnt)
+ if (record->id >= cxt->max_ftrace_cnt)
return -EINVAL;
- prz = cxt->fprzs[id];
+ prz = cxt->fprzs[record->id];
break;
case PSTORE_TYPE_PMSG:
prz = cxt->mprz;
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index c672de41e9b5..a4b2c21a512e 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -177,15 +177,11 @@ struct pstore_record {
*
* @erase:
* Delete a record from backend storage. Different backends
- * identify records differently, so all possible methods of
- * identification are included to help the backend locate the
- * record to remove.
+ * identify records differently, so entire original record is
+ * passed back to assist in identification of what the backend
+ * should remove from storage.
*
- * @type: in: pstore record type to write
- * @id: in: per-type unique identifier for the record
- * @count: in: Oops count
- * @time: in: timestamp for the record
- * @psi: in: pointer to the struct pstore_info for the backend
+ * @record: pointer to record metadata.
*
* Returns 0 on success, and non-zero on error.
*
@@ -215,9 +211,7 @@ struct pstore_info {
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, const char __user *buf,
bool compressed, size_t size, struct pstore_info *psi);
- int (*erase)(enum pstore_type_id type, u64 id,
- int count, struct timespec time,
- struct pstore_info *psi);
+ int (*erase)(struct pstore_record *record);
};
/* Supported frontends */
--
2.7.4
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