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light: track incompatible changes of /mars/ symlink tree layout

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In future, any incompatible changes to the symlink tree must be
recognizable by the userspace tools by means of a version number.
This commit is contained in:
Thomas Schoebel-Theuer 2013-04-11 14:19:18 +02:00
parent bd458a93c5
commit cc0b41ca79
1 changed files with 29 additions and 2 deletions
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31
kernel/sy_old/mars_light.c
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@ -4,6 +4,16 @@
#define MARS_DEBUGGING
//#define IO_DEBUGGING
/* This MUST be updated whenever INCOMPATIBLE changes are made to the
* symlink tree in /mars/ .
*
* Just adding a new symlink is usually not "incompatible", if
* other tools like marsadm just ignore it.
*
* "incompatible" means that something may BREAK.
*/
#define SYMLINK_TREE_VERSION "0.1"
// disable this only for debugging!
#define RUN_PEERS
#define RUN_DATA
@ -128,9 +138,8 @@ EXPORT_SYMBOL_GPL(mars_reset_emergency);
#define IS_JAMMED() (mars_emergency_mode > 3)
static
void _make_alivelink(const char *name, loff_t val)
void _make_alivelink_str(const char *name, const char *src)
{
char *src = path_make("%lld", val);
char *dst = path_make("/mars/%s-%s", name, my_id());
if (!src || !dst) {
MARS_ERR("cannot make alivelink paths\n");
@ -140,6 +149,13 @@ void _make_alivelink(const char *name, loff_t val)
mars_symlink(src, dst, NULL, 0);
err:
brick_string_free(dst);
}
static
void _make_alivelink(const char *name, loff_t val)
{
char *src = path_make("%lld", val);
_make_alivelink_str(name, src);
brick_string_free(src);
}
@ -3516,6 +3532,7 @@ enum {
CL_IPS,
CL_PEERS,
CL_ALIVE,
CL_TREE,
CL_EMERGENCY,
CL_REST_SPACE,
// resource definitions
@ -3628,6 +3645,14 @@ static const struct light_class light_classes[] = {
.cl_type = 'l',
.cl_father = CL_ROOT,
},
/* Show version indication for symlink tree.
*/
[CL_TREE] = {
.cl_name = "tree-",
.cl_len = 5,
.cl_type = 'l',
.cl_father = CL_ROOT,
},
/* Indicate whether filesystem is full
*/
[CL_EMERGENCY] = {
@ -4102,7 +4127,9 @@ static int light_thread(void *data)
_global.global_power.button = false;
mars_net_is_alive = false;
}
_make_alivelink("alive", _global.global_power.button ? 1 : 0);
_make_alivelink_str("tree", SYMLINK_TREE_VERSION);
compute_emergency_mode();