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-rw-r--r--drivers/md/dm-crypt.c7
-rw-r--r--drivers/md/dm-mpath.c152
-rw-r--r--drivers/md/dm-table.c57
-rw-r--r--include/linux/device-mapper.h43
4 files changed, 147 insertions, 112 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index f5406766ece..b79e7472a9b 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -30,7 +30,6 @@
#include <linux/device-mapper.h>
#define DM_MSG_PREFIX "crypt"
-#define MESG_STR(x) x, sizeof(x)
/*
* context holding the current state of a multi-part conversion
@@ -1770,12 +1769,12 @@ static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
if (argc < 2)
goto error;
- if (!strnicmp(argv[0], MESG_STR("key"))) {
+ if (!strcasecmp(argv[0], "key")) {
if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
DMWARN("not suspended during key manipulation.");
return -EINVAL;
}
- if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) {
+ if (argc == 3 && !strcasecmp(argv[1], "set")) {
ret = crypt_set_key(cc, argv[2]);
if (ret)
return ret;
@@ -1783,7 +1782,7 @@ static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
ret = cc->iv_gen_ops->init(cc);
return ret;
}
- if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) {
+ if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
ret = cc->iv_gen_ops->wipe(cc);
if (ret)
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index adf851a081b..5e0090ef418 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -22,7 +22,6 @@
#include <linux/atomic.h>
#define DM_MSG_PREFIX "multipath"
-#define MESG_STR(x) x, sizeof(x)
#define DM_PG_INIT_DELAY_MSECS 2000
#define DM_PG_INIT_DELAY_DEFAULT ((unsigned) -1)
@@ -505,80 +504,29 @@ static void trigger_event(struct work_struct *work)
* <#paths> <#per-path selector args>
* [<path> [<arg>]* ]+ ]+
*---------------------------------------------------------------*/
-struct param {
- unsigned min;
- unsigned max;
- char *error;
-};
-
-static int read_param(struct param *param, char *str, unsigned *v, char **error)
-{
- if (!str ||
- (sscanf(str, "%u", v) != 1) ||
- (*v < param->min) ||
- (*v > param->max)) {
- *error = param->error;
- return -EINVAL;
- }
-
- return 0;
-}
-
-struct arg_set {
- unsigned argc;
- char **argv;
-};
-
-static char *shift(struct arg_set *as)
-{
- char *r;
-
- if (as->argc) {
- as->argc--;
- r = *as->argv;
- as->argv++;
- return r;
- }
-
- return NULL;
-}
-
-static void consume(struct arg_set *as, unsigned n)
-{
- BUG_ON (as->argc < n);
- as->argc -= n;
- as->argv += n;
-}
-
-static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
+static int parse_path_selector(struct dm_arg_set *as, struct priority_group *pg,
struct dm_target *ti)
{
int r;
struct path_selector_type *pst;
unsigned ps_argc;
- static struct param _params[] = {
+ static struct dm_arg _args[] = {
{0, 1024, "invalid number of path selector args"},
};
- pst = dm_get_path_selector(shift(as));
+ pst = dm_get_path_selector(dm_shift_arg(as));
if (!pst) {
ti->error = "unknown path selector type";
return -EINVAL;
}
- r = read_param(_params, shift(as), &ps_argc, &ti->error);
+ r = dm_read_arg_group(_args, as, &ps_argc, &ti->error);
if (r) {
dm_put_path_selector(pst);
return -EINVAL;
}
- if (ps_argc > as->argc) {
- dm_put_path_selector(pst);
- ti->error = "not enough arguments for path selector";
- return -EINVAL;
- }
-
r = pst->create(&pg->ps, ps_argc, as->argv);
if (r) {
dm_put_path_selector(pst);
@@ -587,12 +535,12 @@ static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
}
pg->ps.type = pst;
- consume(as, ps_argc);
+ dm_consume_args(as, ps_argc);
return 0;
}
-static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
+static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps,
struct dm_target *ti)
{
int r;
@@ -609,7 +557,7 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
if (!p)
return ERR_PTR(-ENOMEM);
- r = dm_get_device(ti, shift(as), dm_table_get_mode(ti->table),
+ r = dm_get_device(ti, dm_shift_arg(as), dm_table_get_mode(ti->table),
&p->path.dev);
if (r) {
ti->error = "error getting device";
@@ -660,16 +608,16 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
return ERR_PTR(r);
}
-static struct priority_group *parse_priority_group(struct arg_set *as,
+static struct priority_group *parse_priority_group(struct dm_arg_set *as,
struct multipath *m)
{
- static struct param _params[] = {
+ static struct dm_arg _args[] = {
{1, 1024, "invalid number of paths"},
{0, 1024, "invalid number of selector args"}
};
int r;
- unsigned i, nr_selector_args, nr_params;
+ unsigned i, nr_selector_args, nr_args;
struct priority_group *pg;
struct dm_target *ti = m->ti;
@@ -693,26 +641,26 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
/*
* read the paths
*/
- r = read_param(_params, shift(as), &pg->nr_pgpaths, &ti->error);
+ r = dm_read_arg(_args, as, &pg->nr_pgpaths, &ti->error);
if (r)
goto bad;
- r = read_param(_params + 1, shift(as), &nr_selector_args, &ti->error);
+ r = dm_read_arg(_args + 1, as, &nr_selector_args, &ti->error);
if (r)
goto bad;
- nr_params = 1 + nr_selector_args;
+ nr_args = 1 + nr_selector_args;
for (i = 0; i < pg->nr_pgpaths; i++) {
struct pgpath *pgpath;
- struct arg_set path_args;
+ struct dm_arg_set path_args;
- if (as->argc < nr_params) {
+ if (as->argc < nr_args) {
ti->error = "not enough path parameters";
r = -EINVAL;
goto bad;
}
- path_args.argc = nr_params;
+ path_args.argc = nr_args;
path_args.argv = as->argv;
pgpath = parse_path(&path_args, &pg->ps, ti);
@@ -723,7 +671,7 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
pgpath->pg = pg;
list_add_tail(&pgpath->list, &pg->pgpaths);
- consume(as, nr_params);
+ dm_consume_args(as, nr_args);
}
return pg;
@@ -733,28 +681,23 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
return ERR_PTR(r);
}
-static int parse_hw_handler(struct arg_set *as, struct multipath *m)
+static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
{
unsigned hw_argc;
int ret;
struct dm_target *ti = m->ti;
- static struct param _params[] = {
+ static struct dm_arg _args[] = {
{0, 1024, "invalid number of hardware handler args"},
};
- if (read_param(_params, shift(as), &hw_argc, &ti->error))
+ if (dm_read_arg_group(_args, as, &hw_argc, &ti->error))
return -EINVAL;
if (!hw_argc)
return 0;
- if (hw_argc > as->argc) {
- ti->error = "not enough arguments for hardware handler";
- return -EINVAL;
- }
-
- m->hw_handler_name = kstrdup(shift(as), GFP_KERNEL);
+ m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL);
request_module("scsi_dh_%s", m->hw_handler_name);
if (scsi_dh_handler_exist(m->hw_handler_name) == 0) {
ti->error = "unknown hardware handler type";
@@ -778,7 +721,7 @@ static int parse_hw_handler(struct arg_set *as, struct multipath *m)
for (i = 0, p+=j+1; i <= hw_argc - 2; i++, p+=j+1)
j = sprintf(p, "%s", as->argv[i]);
}
- consume(as, hw_argc - 1);
+ dm_consume_args(as, hw_argc - 1);
return 0;
fail:
@@ -787,52 +730,45 @@ fail:
return ret;
}
-static int parse_features(struct arg_set *as, struct multipath *m)
+static int parse_features(struct dm_arg_set *as, struct multipath *m)
{
int r;
unsigned argc;
struct dm_target *ti = m->ti;
- const char *param_name;
+ const char *arg_name;
- static struct param _params[] = {
+ static struct dm_arg _args[] = {
{0, 5, "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"},
};
- r = read_param(_params, shift(as), &argc, &ti->error);
+ r = dm_read_arg_group(_args, as, &argc, &ti->error);
if (r)
return -EINVAL;
if (!argc)
return 0;
- if (argc > as->argc) {
- ti->error = "not enough arguments for features";
- return -EINVAL;
- }
-
do {
- param_name = shift(as);
+ arg_name = dm_shift_arg(as);
argc--;
- if (!strnicmp(param_name, MESG_STR("queue_if_no_path"))) {
+ if (!strcasecmp(arg_name, "queue_if_no_path")) {
r = queue_if_no_path(m, 1, 0);
continue;
}
- if (!strnicmp(param_name, MESG_STR("pg_init_retries")) &&
+ if (!strcasecmp(arg_name, "pg_init_retries") &&
(argc >= 1)) {
- r = read_param(_params + 1, shift(as),
- &m->pg_init_retries, &ti->error);
+ r = dm_read_arg(_args + 1, as, &m->pg_init_retries, &ti->error);
argc--;
continue;
}
- if (!strnicmp(param_name, MESG_STR("pg_init_delay_msecs")) &&
+ if (!strcasecmp(arg_name, "pg_init_delay_msecs") &&
(argc >= 1)) {
- r = read_param(_params + 2, shift(as),
- &m->pg_init_delay_msecs, &ti->error);
+ r = dm_read_arg(_args + 2, as, &m->pg_init_delay_msecs, &ti->error);
argc--;
continue;
}
@@ -847,15 +783,15 @@ static int parse_features(struct arg_set *as, struct multipath *m)
static int multipath_ctr(struct dm_target *ti, unsigned int argc,
char **argv)
{
- /* target parameters */
- static struct param _params[] = {
+ /* target arguments */
+ static struct dm_arg _args[] = {
{0, 1024, "invalid number of priority groups"},
{0, 1024, "invalid initial priority group number"},
};
int r;
struct multipath *m;
- struct arg_set as;
+ struct dm_arg_set as;
unsigned pg_count = 0;
unsigned next_pg_num;
@@ -876,11 +812,11 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
if (r)
goto bad;
- r = read_param(_params, shift(&as), &m->nr_priority_groups, &ti->error);
+ r = dm_read_arg(_args, &as, &m->nr_priority_groups, &ti->error);
if (r)
goto bad;
- r = read_param(_params + 1, shift(&as), &next_pg_num, &ti->error);
+ r = dm_read_arg(_args + 1, &as, &next_pg_num, &ti->error);
if (r)
goto bad;
@@ -1510,10 +1446,10 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
}
if (argc == 1) {
- if (!strnicmp(argv[0], MESG_STR("queue_if_no_path"))) {
+ if (!strcasecmp(argv[0], "queue_if_no_path")) {
r = queue_if_no_path(m, 1, 0);
goto out;
- } else if (!strnicmp(argv[0], MESG_STR("fail_if_no_path"))) {
+ } else if (!strcasecmp(argv[0], "fail_if_no_path")) {
r = queue_if_no_path(m, 0, 0);
goto out;
}
@@ -1524,18 +1460,18 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
goto out;
}
- if (!strnicmp(argv[0], MESG_STR("disable_group"))) {
+ if (!strcasecmp(argv[0], "disable_group")) {
r = bypass_pg_num(m, argv[1], 1);
goto out;
- } else if (!strnicmp(argv[0], MESG_STR("enable_group"))) {
+ } else if (!strcasecmp(argv[0], "enable_group")) {
r = bypass_pg_num(m, argv[1], 0);
goto out;
- } else if (!strnicmp(argv[0], MESG_STR("switch_group"))) {
+ } else if (!strcasecmp(argv[0], "switch_group")) {
r = switch_pg_num(m, argv[1]);
goto out;
- } else if (!strnicmp(argv[0], MESG_STR("reinstate_path")))
+ } else if (!strcasecmp(argv[0], "reinstate_path"))
action = reinstate_path;
- else if (!strnicmp(argv[0], MESG_STR("fail_path")))
+ else if (!strcasecmp(argv[0], "fail_path"))
action = fail_path;
else {
DMWARN("Unrecognised multipath message received.");
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 03516c7f5be..259ce99302f 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -797,6 +797,63 @@ int dm_table_add_target(struct dm_table *t, const char *type,
return r;
}
+/*
+ * Target argument parsing helpers.
+ */
+static int validate_next_arg(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);
+
+ if (!arg_str ||
+ (sscanf(arg_str, "%u", value) != 1) ||
+ (*value < arg->min) ||
+ (*value > arg->max) ||
+ (grouped && arg_set->argc < *value)) {
+ *error = arg->error;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int dm_read_arg(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,
+ unsigned *value, char **error)
+{
+ return validate_next_arg(arg, arg_set, value, error, 1);
+}
+EXPORT_SYMBOL(dm_read_arg_group);
+
+const char *dm_shift_arg(struct dm_arg_set *as)
+{
+ char *r;
+
+ if (as->argc) {
+ as->argc--;
+ r = *as->argv;
+ as->argv++;
+ return r;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(dm_shift_arg);
+
+void dm_consume_args(struct dm_arg_set *as, unsigned num_args)
+{
+ BUG_ON(as->argc < num_args);
+ as->argc -= num_args;
+ as->argv += num_args;
+}
+EXPORT_SYMBOL(dm_consume_args);
+
static int dm_table_set_type(struct dm_table *t)
{
unsigned i;
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 4427e045405..3fa1f3d90ce 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -208,6 +208,49 @@ struct dm_target_callbacks {
int dm_register_target(struct target_type *t);
void dm_unregister_target(struct target_type *t);
+/*
+ * Target argument parsing.
+ */
+struct dm_arg_set {
+ unsigned argc;
+ char **argv;
+};
+
+/*
+ * The minimum and maximum value of a numeric argument, together with
+ * the error message to use if the number is found to be outside that range.
+ */
+struct dm_arg {
+ unsigned min;
+ unsigned max;
+ char *error;
+};
+
+/*
+ * 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,
+ unsigned *value, char **error);
+
+/*
+ * Process the next argument as the start of a group containing between
+ * 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,
+ unsigned *num_args, char **error);
+
+/*
+ * Return the current argument and shift to the next.
+ */
+const char *dm_shift_arg(struct dm_arg_set *as);
+
+/*
+ * Move through num_args arguments.
+ */
+void dm_consume_args(struct dm_arg_set *as, unsigned num_args);
+
/*-----------------------------------------------------------------
* Functions for creating and manipulating mapped devices.
* Drop the reference with dm_put when you finish with the object.
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-27 05:35:44 +0000