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liblvm: add lv_rename_update

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Support lv_rename without directly updating metatata.
It can save some metadata commits in some cases,
i.e. when LVs are offline.
This commit is contained in:
Zdenek Kabelac 2012-09-27 09:48:25 +02:00
parent 739092e64a
commit 21c401006c
3 changed files with 19 additions and 3 deletions
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1
WHATS_NEW
View File

@ -1,5 +1,6 @@
Version 2.02.98 - Version 2.02.98 -
================================= =================================
Add internal lv_rename_update() to rename LV without updating mda.
Ensure descriptors 0,1,2 are always available. Ensure descriptors 0,1,2 are always available.
Use /proc/self/fd for closing openned descriptors. Use /proc/self/fd for closing openned descriptors.
Add missing pkg init with --enable-testing in configure.in (2.02.71). Add missing pkg init with --enable-testing in configure.in (2.02.71).

19
lib/metadata/lv_manip.c
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@ -2938,8 +2938,8 @@ int for_each_sub_lv(struct cmd_context *cmd, struct logical_volume *lv,
* Core of LV renaming routine. * Core of LV renaming routine.
* VG must be locked by caller. * VG must be locked by caller.
*/ */
int lv_rename(struct cmd_context *cmd, struct logical_volume *lv, int lv_rename_update(struct cmd_context *cmd, struct logical_volume *lv,
const char *new_name) const char *new_name, int update_mda)
{ {
struct volume_group *vg = lv->vg; struct volume_group *vg = lv->vg;
struct lv_names lv_names; struct lv_names lv_names;
@ -2964,7 +2964,7 @@ int lv_rename(struct cmd_context *cmd, struct logical_volume *lv,
return 0; return 0;
} }
if (!archive(vg)) if (update_mda && !archive(vg))
return 0; return 0;
/* rename sub LVs */ /* rename sub LVs */
@ -2986,6 +2986,9 @@ int lv_rename(struct cmd_context *cmd, struct logical_volume *lv,
if (lv_is_cow(lv) && lv_is_virtual_origin(lvl2.lv = origin_from_cow(lv))) if (lv_is_cow(lv) && lv_is_virtual_origin(lvl2.lv = origin_from_cow(lv)))
dm_list_add_h(&lvs_changed, &lvl2.list); dm_list_add_h(&lvs_changed, &lvl2.list);
if (!update_mda)
return 1;
log_verbose("Writing out updated volume group"); log_verbose("Writing out updated volume group");
if (!vg_write(vg)) if (!vg_write(vg))
return 0; return 0;
@ -3009,6 +3012,16 @@ out:
return r; return r;
} }
/*
* Core of LV renaming routine.
* VG must be locked by caller.
*/
int lv_rename(struct cmd_context *cmd, struct logical_volume *lv,
const char *new_name)
{
return lv_rename_update(cmd, lv, new_name, 1);
}
char *generate_lv_name(struct volume_group *vg, const char *format, char *generate_lv_name(struct volume_group *vg, const char *format,
char *buffer, size_t len) char *buffer, size_t len)
{ {

2
lib/metadata/metadata-exported.h
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@ -560,6 +560,8 @@ int lv_remove_with_dependencies(struct cmd_context *cmd, struct logical_volume *
int lv_rename(struct cmd_context *cmd, struct logical_volume *lv, int lv_rename(struct cmd_context *cmd, struct logical_volume *lv,
const char *new_name); const char *new_name);
int lv_rename_update(struct cmd_context *cmd, struct logical_volume *lv,
const char *new_name, int update_mda);
uint64_t extents_from_size(struct cmd_context *cmd, uint64_t size, uint64_t extents_from_size(struct cmd_context *cmd, uint64_t size,
uint32_t extent_size); uint32_t extent_size);