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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 /include/linux/device-mapper.h
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 'include/linux/device-mapper.h')
-rw-r--r--include/linux/device-mapper.h43
1 files changed, 43 insertions, 0 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 4427e0454051..3fa1f3d90ce0 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.