master - Use lv_is_active instead of lv_info()

[Marian Csontos <mcsontos@redhat.com>]

On 10/17/2012 03:43 PM, Zdenek Kabelac wrote:
> Gitweb:        http://git.fedorahosted.org/git/?p=lvm2.git;a=commitdiff;h=bf2741376d47411994d4065863acab8e405ff5c7
> Commit:        bf2741376d47411994d4065863acab8e405ff5c7
> Parent:        e431b19bac29cf8fc21530118eb283b6ae703cbb
> Author:        Zdenek Kabelac<zkabelac@redhat.com>
> AuthorDate:    Tue Jan 31 23:42:53 2012 +0100
> Committer:     Zdenek Kabelac<zkabelac@redhat.com>
> CommitterDate: Wed Oct 17 15:42:31 2012 +0200
>
> Use lv_is_active instead of lv_info()
>
> Usage of lv_is_active makes it more obvious what is being checked.
> ---
>   WHATS_NEW               |    1 +
>   lib/metadata/lv_manip.c |    5 ++---
>   lib/metadata/mirror.c   |    9 +++------
>   lib/report/report.c     |    3 +--
>   4 files changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/WHATS_NEW b/WHATS_NEW
> index 370c7e5..8ba9f2d 100644
> --- a/WHATS_NEW
> +++ b/WHATS_NEW
> @@ -1,5 +1,6 @@
>   Version 2.02.99 -
>   ===================================
> +  Use lv_is_active() instead of lv_info() call.
>     Cleanup some log_error message and use log_warn instead.
>
>   Version 2.02.98 - 15th October 2012
> diff --git a/lib/metadata/lv_manip.c b/lib/metadata/lv_manip.c
> index d2aca00..32a207d 100644
> --- a/lib/metadata/lv_manip.c
> +++ b/lib/metadata/lv_manip.c
> @@ -4218,7 +4218,6 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg, struct l
>   	struct logical_volume *pool_lv;
>   	struct lv_list *lvl;
>   	int origin_active = 0;
> -	struct lvinfo info;
>
>   	if (new_lv_name&&  find_lv_in_vg(vg, new_lv_name)) {
>   		log_error("Logical volume \"%s\" already exists in "
> @@ -4350,12 +4349,12 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg, struct l
>   				log_warn("WARNING: See global/mirror_segtype_default in lvm.conf.");
>   			}
>

> -			if (!lv_info(cmd, org, 0,&info, 0, 0)) {
> +			if (!lv_is_active(org)) {
>   				log_error("Check for existence of active snapshot "
>   					  "origin '%s' failed.", org->name);
>   				return NULL;
>   			}
> -			origin_active = info.exists;
> +			origin_active = 1;

Zdenku, I think this fragment is not equivalent to the original and 
leads to regression: one can not make a snapshot of an inactive LV.

This is a regression, and it was already fixed once:

https://bugzilla.redhat.com/show_bug.cgi?id=805300

I am not 100% sure this is the cause - I see different error message, 
but this was fine in 2.02.98, it was fine in 10ba799a, and was failing 
in a820a686.

The reproducer is:

#!/bin/bash

VG=vg
lvcreate -L 300M $VG -n origin
lvchange -an $VG/origin
lvcreate -s /dev/$VG/origin -c 32 -n snap_of_inactive -L 100M
    One or more specified logical volume(s) not      found.

If you are sure this is correct, I will open a new BZ

-- Marian

>
>   			if (vg_is_clustered(vg)&&
>   			!lv_is_active_exclusive_locally(org)) {
> diff --git a/lib/metadata/mirror.c b/lib/metadata/mirror.c
> index c4683df..084c93a 100644
> --- a/lib/metadata/mirror.c
> +++ b/lib/metadata/mirror.c
> @@ -282,7 +282,6 @@ static int _init_mirror_log(struct cmd_context *cmd,
>   			    struct dm_list *tags, int remove_on_failure)
>   {
>   	struct str_list *sl;
> -	struct lvinfo info;
>   	uint64_t orig_status = log_lv->status;
>   	int was_active = 0;
>
> @@ -298,14 +297,13 @@ static int _init_mirror_log(struct cmd_context *cmd,
>   	}
>
>   	/* If the LV is active, deactivate it first. */
> -	if (lv_info(cmd, log_lv, 0,&info, 0, 0)&&  info.exists) {
> -		(void)deactivate_lv(cmd, log_lv);
> +	if (lv_is_active(log_lv)) {
>   		/*
>   		 * FIXME: workaround to fail early
>   		 * Ensure that log is really deactivated because deactivate_lv
>   		 * on cluster do not fail if there is log_lv with different UUID.
>   		 */
> -		if (lv_info(cmd, log_lv, 0,&info, 0, 0)&&  info.exists) {
> +		if (!deactivate_lv(cmd, log_lv)) {
>   			log_error("Aborting. Unable to deactivate mirror log.");
>   			goto revert_new_lv;
>   		}
> @@ -1714,7 +1712,6 @@ int remove_mirror_log(struct cmd_context *cmd,
>   		      int force)
>   {
>   	percent_t sync_percent;
> -	struct lvinfo info;
>   	struct volume_group *vg = lv->vg;
>
>   	/* Unimplemented features */
> @@ -1724,7 +1721,7 @@ int remove_mirror_log(struct cmd_context *cmd,
>   	}
>
>   	/* Had disk log, switch to core. */
> -	if (lv_info(cmd, lv, 0,&info, 0, 0)&&  info.exists) {
> +	if (lv_is_active(lv)) {
>   		if (!lv_mirror_percent(cmd, lv, 0,&sync_percent,
>   				       NULL)) {
>   			log_error("Unable to determine mirror sync status.");
> diff --git a/lib/report/report.c b/lib/report/report.c
> index eeca282..b1e2bc1 100644
> --- a/lib/report/report.c
> +++ b/lib/report/report.c
> @@ -830,7 +830,6 @@ static int _snpercent_disp(struct dm_report *rh __attribute__((unused)), struct
>   			   const void *data, void *private __attribute__((unused)))
>   {
>   	const struct logical_volume *lv = (const struct logical_volume *) data;
> -	struct lvinfo info;
>   	percent_t snap_percent;
>   	uint64_t *sortval;
>   	char *repstr;
> @@ -847,7 +846,7 @@ static int _snpercent_disp(struct dm_report *rh __attribute__((unused)), struct
>   	}
>
>   	if ((!lv_is_cow(lv)&&  !lv_is_merging_origin(lv)) ||
> -	    !lv_info(lv->vg->cmd, lv, 0,&info, 0, 0) || !info.exists) {
> +	    !lv_is_active(lv)) {
>   		*sortval = UINT64_C(0);
>   		dm_report_field_set_value(field, "", sortval);
>   		return 1;
>
> --
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