config: add support for loading profiles

This patch adds --profile arg to lvm cmds and adds config/profile_dir
configuration setting to select the directory where profiles are stored
By default it's /etc/lvm/profile.

The profiles are added by using new "add_profile" fn and then loaded
using the "load_profile" fn. All profiles are stored in a cmd context
within the new "struct profile_params":

struct profile_params {
  const char *dir;
  struct profile *global_profile;
  struct dm_list profiles_to_load;
  struct dm_list profiles;
};

...where "dir" is the directory with profiles, "global_profile" is
the profile that is set globally via the --profile arg (IOW, not
set per VG/LV basis based on metadata record) and the "profiles"
is the list with loaded profiles.

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/mm/memlock.c b/lib/mm/memlock.c
index 08876b0e6..fda3bb81b 100644
--- a/lib/mm/memlock.c
+++ b/lib/mm/memlock.c
@@ -406,6 +406,13 @@ static void _unlock_mem_if_possible(struct cmd_context *cmd)
 
 void critical_section_inc(struct cmd_context *cmd, const char *reason)
 {
+	/*
+	 * Profiles are loaded on-demand so make sure that before
+	 * entering the critical section all needed profiles are
+	 * loaded to avoid the disk access later.
+	 */
+	load_pending_profiles(cmd);
+
 	if (!_critical_section) {
 		_critical_section = 1;
 		log_debug_mem("Entering critical section (%s).", reason);