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Document return codes.

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This commit is contained in:
Alasdair Kergon 2002-02-11 17:42:02 +00:00
parent 6d52fb460b
commit a62ee8ad27
2 changed files with 17 additions and 4 deletions
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11
lib/activate/activate.c
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@ -62,6 +62,11 @@ static int _query(struct logical_volume *lv, int (*fn)(const char *))
return fn(buffer); return fn(buffer);
} }
/*
* These three functions return the number of LVs in the state,
* or -1 on error.
*/
int lv_active(struct logical_volume *lv) int lv_active(struct logical_volume *lv)
{ {
return _query(lv, device_active); return _query(lv, device_active);
@ -77,6 +82,10 @@ int lv_open_count(struct logical_volume *lv)
return _query(lv, device_open_count); return _query(lv, device_open_count);
} }
/*
* Returns 1 if info structure populated, else 0 on failure.
*/
int lv_info(struct logical_volume *lv, struct dm_info *info) int lv_info(struct logical_volume *lv, struct dm_info *info)
{ {
char buffer[128]; char buffer[128];
@ -84,7 +93,7 @@ int lv_info(struct logical_volume *lv, struct dm_info *info)
if (!build_dm_name(buffer, sizeof(buffer), "", if (!build_dm_name(buffer, sizeof(buffer), "",
lv->vg->name, lv->name)) { lv->vg->name, lv->name)) {
stack; stack;
return -1; return 0;
} }
return device_info(buffer, info); return device_info(buffer, info);

10
lib/activate/activate.h
View File

@ -13,11 +13,15 @@ int driver_version(char *version, size_t size);
int library_version(char *version, size_t size); int library_version(char *version, size_t size);
/* /*
* Status functions. * Status functions. Return count (0 upwards) or else -1 on error.
*/ */
int lv_active(struct logical_volume *lv); int lv_active(struct logical_volume *lv);
int lv_suspended(struct logical_volume *lv); int lv_suspended(struct logical_volume *lv);
int lv_open_count(struct logical_volume *lv); int lv_open_count(struct logical_volume *lv);
/*
* Returns 1 if info structure has been populated, else 0.
*/
int lv_info(struct logical_volume *lv, struct dm_info *info); int lv_info(struct logical_volume *lv, struct dm_info *info);
/* /*
@ -42,12 +46,12 @@ int lv_update_write_access(struct logical_volume *lv);
/* /*
* Activate all LVs in the VG. Ignore any that are already * Activate all LVs in the VG. Ignore any that are already
* active. Return number activated. * active. Return number actually activated.
*/ */
int activate_lvs_in_vg(struct volume_group *vg); int activate_lvs_in_vg(struct volume_group *vg);
/* /*
* Deactivate all LVs in the VG * Deactivate all LVs in the VG. Return number actually deactivated.
*/ */
int deactivate_lvs_in_vg(struct volume_group *vg); int deactivate_lvs_in_vg(struct volume_group *vg);