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format: format_text: add pv_needs_rewrite to format_handler and implemention for format_text

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This commit is contained in:
Peter Rajnoha 2016-02-12 13:53:06 +01:00
parent 08de88535e
commit 9b9f1ae772
2 changed files with 31 additions and 0 deletions
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22
lib/format_text/format-text.c
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@ -1439,6 +1439,27 @@ static int _text_pv_write(const struct format_type *fmt, struct physical_volume
return 1;
}
static int _text_pv_needs_rewrite(const struct format_type *fmt, struct physical_volume *pv,
int *needs_rewrite)
{
struct lvmcache_info *info;
uint32_t ext_vsn;
*needs_rewrite = 0;
if (!(info = lvmcache_info_from_pvid((const char *)&pv->id, 0))) {
log_error("Failed to find cached info for PV %s.", pv_dev_name(pv));
return 0;
}
ext_vsn = lvmcache_ext_version(info);
if (ext_vsn < PV_HEADER_EXTENSION_VSN)
*needs_rewrite = 1;
return 1;
}
static int _add_raw(struct dm_list *raw_list, struct device_area *dev_area)
{
struct raw_list *rl;
@ -2384,6 +2405,7 @@ static struct format_handler _text_handler = {
.pv_remove_metadata_area = _text_pv_remove_metadata_area,
.pv_resize = _text_pv_resize,
.pv_write = _text_pv_write,
.pv_needs_rewrite = _text_pv_needs_rewrite,
.vg_setup = _text_vg_setup,
.lv_setup = _text_lv_setup,
.create_instance = _text_create_text_instance,

9
lib/metadata/metadata.h
View File

@ -302,6 +302,15 @@ struct format_handler {
int (*pv_write) (const struct format_type * fmt,
struct physical_volume * pv);
/*
* Check if PV needs rewriting. This is used to check whether there are any
* format-specific changes before actually writing the PV (by calling pv_write).
* With this, we can call pv_write conditionally only if it's really needed.
*/
int (*pv_needs_rewrite) (const struct format_type *fmt,
struct physical_volume *pv,
int *needs_rewrite);
/*
* Tweak an already filled out a lv eg, check there
* aren't too many extents.