From: Eric Biggers <ebiggers@google.com>
Date: Thu, 22 Jun 2017 11:32:45 -0700
Subject: [PATCH] dm: constify argument arrays
Git-commit: 5916a22b83041b07d63191fe06206ae0fff6ec7a
Patch-mainline: v4.14-rc1
References: bsc#1104967,FATE#325924
The arrays of 'struct dm_arg' are never modified by the device-mapper
core, so constify them so that they are placed in .rodata.
(Exception: the args array in dm-raid cannot be constified because it is
allocated on the stack and modified.)
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/md/dm-cache-target.c | 4 ++--
drivers/md/dm-crypt.c | 2 +-
drivers/md/dm-flakey.c | 4 ++--
drivers/md/dm-integrity.c | 2 +-
drivers/md/dm-mpath.c | 10 +++++-----
drivers/md/dm-switch.c | 2 +-
drivers/md/dm-table.c | 7 ++++---
drivers/md/dm-thin.c | 2 +-
drivers/md/dm-verity-target.c | 2 +-
include/linux/device-mapper.h | 4 ++--
10 files changed, 20 insertions(+), 19 deletions(-)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index c5ea03fc7ee1..b0a5503a2fd3 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2306,7 +2306,7 @@ static void init_features(struct cache_features *cf)
static int parse_features(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 2, "Invalid number of cache feature arguments"},
};
@@ -2348,7 +2348,7 @@ static int parse_features(struct cache_args *ca, struct dm_arg_set *as,
static int parse_policy(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 1024, "Invalid number of policy arguments"},
};
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index cdf6b1e12460..abf16559ed49 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -2533,7 +2533,7 @@ static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **ar
{
struct crypt_config *cc = ti->private;
struct dm_arg_set as;
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 6, "Invalid number of feature args"},
};
unsigned int opt_params, val;
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index e2c7234931bc..d8bb371e63d7 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -51,7 +51,7 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
unsigned argc;
const char *arg_name;
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 6, "Invalid number of feature args"},
{1, UINT_MAX, "Invalid corrupt bio byte"},
{0, 255, "Invalid corrupt value to write into bio byte (0-255)"},
@@ -178,7 +178,7 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
*/
static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, UINT_MAX, "Invalid up interval"},
{0, UINT_MAX, "Invalid down interval"},
};
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index 47fd409b2e2a..293a19652d55 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -2780,7 +2780,7 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
int r;
unsigned extra_args;
struct dm_arg_set as;
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 9, "Invalid number of feature args"},
};
unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 7406ededf875..bf280a99fa81 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -702,7 +702,7 @@ static int parse_path_selector(struct dm_arg_set *as, struct priority_group *pg,
struct path_selector_type *pst;
unsigned ps_argc;
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 1024, "invalid number of path selector args"},
};
@@ -826,7 +826,7 @@ static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps
static struct priority_group *parse_priority_group(struct dm_arg_set *as,
struct multipath *m)
{
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{1, 1024, "invalid number of paths"},
{0, 1024, "invalid number of selector args"}
};
@@ -902,7 +902,7 @@ static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
int ret;
struct dm_target *ti = m->ti;
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 1024, "invalid number of hardware handler args"},
};
@@ -954,7 +954,7 @@ static int parse_features(struct dm_arg_set *as, struct multipath *m)
struct dm_target *ti = m->ti;
const char *arg_name;
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 8, "invalid number of feature args"},
{1, 50, "pg_init_retries must be between 1 and 50"},
{0, 60000, "pg_init_delay_msecs must be between 0 and 60000"},
@@ -1023,7 +1023,7 @@ static int parse_features(struct dm_arg_set *as, struct multipath *m)
static int multipath_ctr(struct dm_target *ti, unsigned argc, char **argv)
{
/* target arguments */
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 1024, "invalid number of priority groups"},
{0, 1024, "invalid initial priority group number"},
};
diff --git a/drivers/md/dm-switch.c b/drivers/md/dm-switch.c
index 871c18fe000d..83a371d54412 100644
--- a/drivers/md/dm-switch.c
+++ b/drivers/md/dm-switch.c
@@ -251,7 +251,7 @@ static void switch_dtr(struct dm_target *ti)
*/
static int switch_ctr(struct dm_target *ti, unsigned argc, char **argv)
{
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{1, (KMALLOC_MAX_SIZE - sizeof(struct switch_ctx)) / sizeof(struct switch_path), "Invalid number of paths"},
{1, UINT_MAX, "Invalid region size"},
{0, 0, "Invalid number of optional args"},
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 28a4071cdf85..ef7b8f201f73 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -806,7 +806,8 @@ int dm_table_add_target(struct dm_table *t, const char *type,
/*
* Target argument parsing helpers.
*/
-static int validate_next_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
+static int validate_next_arg(const struct dm_arg *arg,
+ struct dm_arg_set *arg_set,
unsigned *value, char **error, unsigned grouped)
{
const char *arg_str = dm_shift_arg(arg_set);
@@ -824,14 +825,14 @@ static int validate_next_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
return 0;
}
-int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
+int dm_read_arg(const struct dm_arg *arg, struct dm_arg_set *arg_set,
unsigned *value, char **error)
{
return validate_next_arg(arg, arg_set, value, error, 0);
}
EXPORT_SYMBOL(dm_read_arg);
-int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set,
+int dm_read_arg_group(const struct dm_arg *arg, struct dm_arg_set *arg_set,
unsigned *value, char **error)
{
return validate_next_arg(arg, arg_set, value, error, 1);
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 9dec2f8cc739..9736621c2963 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -3041,7 +3041,7 @@ static int parse_pool_features(struct dm_arg_set *as, struct pool_features *pf,
unsigned argc;
const char *arg_name;
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, 4, "Invalid number of pool feature arguments"},
};
diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index b46705ebf01f..79f18d4d7f02 100644
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -839,7 +839,7 @@ static int verity_parse_opt_args(struct dm_arg_set *as, struct dm_verity *v)
struct dm_target *ti = v->ti;
const char *arg_name;
- static struct dm_arg _args[] = {
+ static const struct dm_arg _args[] = {
{0, DM_VERITY_OPTS_MAX, "Invalid number of feature args"},
};
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 4f2b3b2076c4..3b5fdf308148 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -387,7 +387,7 @@ struct dm_arg {
* Validate the next argument, either returning it as *value or, if invalid,
* returning -EINVAL and setting *error.
*/
-int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
+int dm_read_arg(const struct dm_arg *arg, struct dm_arg_set *arg_set,
unsigned *value, char **error);
/*
@@ -395,7 +395,7 @@ int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
* arg->min and arg->max further arguments. Either return the size as
* *num_args or, if invalid, return -EINVAL and set *error.
*/
-int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set,
+int dm_read_arg_group(const struct dm_arg *arg, struct dm_arg_set *arg_set,
unsigned *num_args, char **error);
/*
--
2.16.4