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dm verity: separate function for parsing opt args

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Move optional argument parsing into a separate function to make it
easier to add more of them without making verity_ctr even longer.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Sami Tolvanen 2015-11-05 02:02:32 +00:00 committed by Mike Snitzer
parent 6dbeda3469
commit 753c1fd028
1 changed files with 43 additions and 28 deletions
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71
drivers/md/dm-verity.c
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@ -34,6 +34,8 @@
#define DM_VERITY_OPT_LOGGING "ignore_corruption"
#define DM_VERITY_OPT_RESTART "restart_on_corruption"
#define DM_VERITY_OPTS_MAX 1
static unsigned dm_verity_prefetch_cluster = DM_VERITY_DEFAULT_PREFETCH_SIZE;
module_param_named(prefetch_cluster, dm_verity_prefetch_cluster, uint, S_IRUGO | S_IWUSR);
@ -721,6 +723,44 @@ static void verity_dtr(struct dm_target *ti)
kfree(v);
}
static int verity_parse_opt_args(struct dm_arg_set *as, struct dm_verity *v)
{
int r;
unsigned argc;
struct dm_target *ti = v->ti;
const char *arg_name;
static struct dm_arg _args[] = {
{0, DM_VERITY_OPTS_MAX, "Invalid number of feature args"},
};
r = dm_read_arg_group(_args, as, &argc, &ti->error);
if (r)
return -EINVAL;
if (!argc)
return 0;
do {
arg_name = dm_shift_arg(as);
argc--;
if (!strcasecmp(arg_name, DM_VERITY_OPT_LOGGING)) {
v->mode = DM_VERITY_MODE_LOGGING;
continue;
} else if (!strcasecmp(arg_name, DM_VERITY_OPT_RESTART)) {
v->mode = DM_VERITY_MODE_RESTART;
continue;
}
ti->error = "Unrecognized verity feature request";
return -EINVAL;
} while (argc && !r);
return r;
}
/*
* Target parameters:
* <version> The current format is version 1.
@ -739,18 +779,13 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv)
{
struct dm_verity *v;
struct dm_arg_set as;
const char *opt_string;
unsigned int num, opt_params;
unsigned int num;
unsigned long long num_ll;
int r;
int i;
sector_t hash_position;
char dummy;
static struct dm_arg _args[] = {
{0, 1, "Invalid number of feature args"},
};
v = kzalloc(sizeof(struct dm_verity), GFP_KERNEL);
if (!v) {
ti->error = "Cannot allocate verity structure";
@ -895,29 +930,9 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv)
as.argc = argc;
as.argv = argv;
r = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
if (r)
r = verity_parse_opt_args(&as, v);
if (r < 0)
goto bad;
while (opt_params) {
opt_params--;
opt_string = dm_shift_arg(&as);
if (!opt_string) {
ti->error = "Not enough feature arguments";
r = -EINVAL;
goto bad;
}
if (!strcasecmp(opt_string, DM_VERITY_OPT_LOGGING))
v->mode = DM_VERITY_MODE_LOGGING;
else if (!strcasecmp(opt_string, DM_VERITY_OPT_RESTART))
v->mode = DM_VERITY_MODE_RESTART;
else {
ti->error = "Invalid feature arguments";
r = -EINVAL;
goto bad;
}
}
}
v->hash_per_block_bits =