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authorMike Snitzer <snitzer@redhat.com>2011-08-02 15:32:04 +0400
committerAlasdair G Kergon <agk@redhat.com>2011-08-02 15:32:04 +0400
commit498f0103ea13123e007660def9072a0b7dd1c599 (patch)
tree3940ca8e50f13c3ed3a79c1939bacbc841ecb179 /drivers/md/dm-table.c
parenta6e50b409d3f9e0833e69c3c9cca822e8fa4adbb (diff)
downloadlinux-498f0103ea13123e007660def9072a0b7dd1c599.tar.xz
dm table: share target argument parsing functions
Move multipath target argument parsing code into dm-table so other targets can share it. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-table.c')
-rw-r--r--drivers/md/dm-table.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 03516c7f5be1..259ce99302fc 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;