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dm: constify argument arrays

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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>
This commit is contained in:
Eric Biggers 2017-06-22 11:32:45 -07:00 committed by Mike Snitzer
parent 3f2e539359
commit 5916a22b83
10 changed files with 20 additions and 19 deletions
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4
drivers/md/dm-cache-target.c
View File

@ -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"},
};

2
drivers/md/dm-crypt.c
View File

@ -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;

4
drivers/md/dm-flakey.c
View File

@ -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"},
};

2
drivers/md/dm-integrity.c
View File

@ -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;

10
drivers/md/dm-mpath.c
View File

@ -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"},
};

2
drivers/md/dm-switch.c
View File

@ -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"},

7
drivers/md/dm-table.c
View File

@ -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);

2
drivers/md/dm-thin.c
View File

@ -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"},
};

2
drivers/md/dm-verity-target.c
View File

@ -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"},
};

4
include/linux/device-mapper.h
View File

@ -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);
/*