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archives: Preserve format type in file.

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format_text processes both lvm2 on-disk metadata and metadata read
from other sources such as backup files.  Add original_fmt field
to retain the format type of the original metadata.
Before this patch, /etc/lvm/archives would contain backups of
lvm1 metadata with format = "lvm2" unless the source was lvm1 on-disk
metadata.
This commit is contained in:
Alasdair G Kergon 2015-03-04 00:30:26 +00:00
parent 2477495922
commit 4e6f3e5162
4 changed files with 17 additions and 3 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.117 -
====================================
Preserve original format type field when processing backup files.
Implement status action for lvm2-monitor initscript to display monitored LVs.
Allow lvchange -p to change kernel state only if metadata state differs.
Fix incorrect persistent .cache after report with label fields only (2.02.106).

9
lib/format_text/export.c
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@ -393,6 +393,7 @@ static int _out_tags(struct formatter *f, struct dm_list *tagsl)
static int _print_vg(struct formatter *f, struct volume_group *vg)
{
char buffer[4096];
const struct format_type *fmt = NULL;
if (!id_write_format(&vg->id, buffer, sizeof(buffer)))
return_0;
@ -401,8 +402,12 @@ static int _print_vg(struct formatter *f, struct volume_group *vg)
outf(f, "seqno = %u", vg->seqno);
if (vg->fid && vg->fid->fmt)
outfc(f, "# informational", "format = \"%s\"", vg->fid->fmt->name);
if (vg->original_fmt)
fmt = vg->original_fmt;
else if (vg->fid)
fmt = vg->fid->fmt;
if (fmt)
outfc(f, "# informational", "format = \"%s\"", fmt->name);
if (!_print_flag_config(f, vg->status, VG_FLAGS))
return_0;

9
lib/format_text/import_vsn1.c
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@ -733,7 +733,7 @@ static struct volume_group *_read_vg(struct format_instance *fid,
{
const struct dm_config_node *vgn;
const struct dm_config_value *cv;
const char *str;
const char *str, *format_str;
struct volume_group *vg;
struct dm_hash_table *pv_hash = NULL, *lv_hash = NULL;
unsigned scan_done_once = use_cached_pvs;
@ -775,6 +775,13 @@ static struct volume_group *_read_vg(struct format_instance *fid,
vgn = vgn->child;
/* A backup file might be a backup of a different format */
if (dm_config_get_str(vgn, "format", &format_str) &&
!(vg->original_fmt = get_format_by_name(fid->fmt->cmd, format_str))) {
log_error("Unrecognised format %s for volume group %s.", format_str, vg->name);
goto bad;
}
if (dm_config_get_str(vgn, "system_id", &str))
strncpy(system_id, str, NAME_LEN);

1
lib/metadata/vg.h
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@ -44,6 +44,7 @@ struct volume_group {
struct cmd_context *cmd;
struct dm_pool *vgmem;
struct format_instance *fid;
const struct format_type *original_fmt; /* Set when processing backup files */
struct lvmcache_vginfo *vginfo;
struct dm_list *cmd_vgs;/* List of wanted/locked and opened VGs */
uint32_t cmd_missing_vgs;/* Flag marks missing VG */