File bug-1164718_26-pvscan-fix-activation-of-incompl... of Package lvm2

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File bug-1164718_26-pvscan-fix-activation-of-incomplete-VGs.patch of Package lvm2 (Revision 28b680bd18b6885a911f51f5c5303cab)

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From 6b12930860a993624d6325aec2e9c561f4412aa9 Mon Sep 17 00:00:00 2001
From: David Teigland <teigland@redhat.com>
Date: Tue, 3 Sep 2019 15:14:08 -0500
Subject: [PATCH] pvscan: fix activation of incomplete VGs

For a long time there has been a bug in the activation
done by the initial pvscan (which scans all devs to
initialize the lvmetad cache.)  It was attempting to
activate all VGs, even those that were not complete.

lvmetad tells pvscan when a VG is complete, and pvscan
needs to use this information to decide which VGs to
activate.

When there are problems that prevent lvmetad from being
used (e.g. lvmetad is disabled or not running), pvscan
activation cannot use lvmetad to determine when a VG
is complete, so it now checks if devices are present
for all PVs in the VG before activating.

(The recent commit "pvscan: avoid redundant activation"
could make this bug more apparent because redundant
activations can cover up the effect of activating an
incomplete VG and missing some LV activations.)
---
 lib/cache/lvmetad.c   | 15 ++++++++----
 lib/cache/lvmetad.h   |  2 +-
 tools/lvmcmdline.c    |  2 +-
 tools/lvscan.c        |  2 +-
 tools/pvscan.c        | 65 ++++++++++++++++++++++++++++++++++++++++++++++-----
 tools/vgcfgrestore.c  |  2 +-
 tools/vgimport.c      |  2 +-
 tools/vgimportclone.c |  2 +-
 tools/vgscan.c        |  2 +-
 9 files changed, 77 insertions(+), 17 deletions(-)

diff --git a/lib/cache/lvmetad.c b/lib/cache/lvmetad.c
index d7e798d..d242260 100644
--- a/lib/cache/lvmetad.c
+++ b/lib/cache/lvmetad.c
@@ -1702,6 +1702,13 @@ int lvmetad_pv_found(struct cmd_context *cmd, const struct id *pvid, struct devi
 		changed = daemon_reply_int(reply, "changed", 0);
 	}
 
+	if (vg && vg->system_id && vg->system_id[0] &&
+	    cmd->system_id && cmd->system_id[0] &&
+	    strcmp(vg->system_id, cmd->system_id)) {
+		log_debug_lvmetad("Ignore foreign VG %s on %s", vg->name , dev_name(dev));
+		goto out;
+	}
+
 	/*
 	 * If lvmetad now sees all PVs in the VG, it returned the
 	 * "complete" status string.  Add this VG name to the list
@@ -1732,7 +1739,7 @@ int lvmetad_pv_found(struct cmd_context *cmd, const struct id *pvid, struct devi
 				log_error("str_list_add failed");
 		}
 	}
-
+out:
 	daemon_reply_destroy(reply);
 
 	return result;
@@ -2333,7 +2340,7 @@ bad:
  * generally revert disk scanning and not use lvmetad.
  */
 
-int lvmetad_pvscan_all_devs(struct cmd_context *cmd, int do_wait)
+int lvmetad_pvscan_all_devs(struct cmd_context *cmd, int do_wait, struct dm_list *found_vgnames)
 {
 	struct device_list *devl, *devl2;
 	struct dm_list scan_devs;
@@ -2415,7 +2422,7 @@ int lvmetad_pvscan_all_devs(struct cmd_context *cmd, int do_wait)
 
 		dm_list_del(&devl->list);
 
-		ret = lvmetad_pvscan_single(cmd, devl->dev, NULL, NULL);
+		ret = lvmetad_pvscan_single(cmd, devl->dev, found_vgnames, NULL);
 
 		label_scan_invalidate(devl->dev);
 
@@ -2758,7 +2765,7 @@ void lvmetad_validate_global_cache(struct cmd_context *cmd, int force)
 	 * we rescanned for the token, and the time we acquired the global
 	 * lock.)
 	 */
-	if (!lvmetad_pvscan_all_devs(cmd, 1)) {
+	if (!lvmetad_pvscan_all_devs(cmd, 1, NULL)) {
 		log_warn("WARNING: Not using lvmetad because cache update failed.");
 		lvmetad_make_unused(cmd);
 		return;
diff --git a/lib/cache/lvmetad.h b/lib/cache/lvmetad.h
index 73c2645..55ce16a 100644
--- a/lib/cache/lvmetad.h
+++ b/lib/cache/lvmetad.h
@@ -151,7 +151,7 @@ int lvmetad_pvscan_single(struct cmd_context *cmd, struct device *dev,
 			  struct dm_list *found_vgnames,
 			  struct dm_list *changed_vgnames);
 
-int lvmetad_pvscan_all_devs(struct cmd_context *cmd, int do_wait);
+int lvmetad_pvscan_all_devs(struct cmd_context *cmd, int do_wait, struct dm_list *found_vgnames);
 
 int lvmetad_vg_clear_outdated_pvs(struct volume_group *vg);
 void lvmetad_validate_global_cache(struct cmd_context *cmd, int force);
diff --git a/tools/lvmcmdline.c b/tools/lvmcmdline.c
index 0840c65..6a1ab11 100644
--- a/tools/lvmcmdline.c
+++ b/tools/lvmcmdline.c
@@ -2980,7 +2980,7 @@ int lvm_run_command(struct cmd_context *cmd, int argc, char **argv)
 	 */
 	if (lvmetad_used() && !_cmd_no_lvmetad_autoscan(cmd)) {
 		if (cmd->include_foreign_vgs || !lvmetad_token_matches(cmd)) {
-			if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, cmd->include_foreign_vgs ? 1 : 0)) {
+			if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, cmd->include_foreign_vgs ? 1 : 0, NULL)) {
 				log_warn("WARNING: Not using lvmetad because cache update failed.");
 				lvmetad_make_unused(cmd);
 			}
diff --git a/tools/lvscan.c b/tools/lvscan.c
index c38208a..34e9f31 100644
--- a/tools/lvscan.c
+++ b/tools/lvscan.c
@@ -103,7 +103,7 @@ int lvscan(struct cmd_context *cmd, int argc, char **argv)
 
 	/* Needed because this command has NO_LVMETAD_AUTOSCAN. */
 	if (lvmetad_used() && (!lvmetad_token_matches(cmd) || lvmetad_is_disabled(cmd, &reason))) {
-		if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, 0)) {
+		if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, 0, NULL)) {
 			log_warn("WARNING: Not using lvmetad because cache update failed.");
 			lvmetad_make_unused(cmd);
 		}
diff --git a/tools/pvscan.c b/tools/pvscan.c
index c21845c..2e7a864 100644
--- a/tools/pvscan.c
+++ b/tools/pvscan.c
@@ -38,6 +38,7 @@ struct pvscan_params {
 
 struct pvscan_aa_params {
 	int refresh_all;
+	int all_vgs;
 	unsigned int activate_errors;
 	struct dm_list changed_vgnames;
 };
@@ -223,6 +224,28 @@ void online_vg_file_remove(const char *vgname)
 	unlink(path);
 }
 
+static void _online_files_remove(const char *dirpath)
+{
+	char path[PATH_MAX];
+	DIR *dir;
+	struct dirent *de;
+
+	if (!(dir = opendir(dirpath)))
+		return;
+
+	while ((de = readdir(dir))) {
+		if (de->d_name[0] == '.')
+			continue;
+
+		memset(path, 0, sizeof(path));
+		snprintf(path, sizeof(path), "%s/%s", dirpath, de->d_name);
+		if (unlink(path))
+			log_sys_debug("unlink", path);
+	}
+	if (closedir(dir))
+		log_sys_debug("closedir", dirpath);
+}
+
 /*
  * pvscan --cache does not perform any lvmlockd locking, and
  * pvscan --cache -aay skips autoactivation in lockd VGs.
@@ -271,6 +294,8 @@ static int _pvscan_autoactivate_single(struct cmd_context *cmd, const char *vg_n
 				       struct volume_group *vg, struct processing_handle *handle)
 {
 	struct pvscan_aa_params *pp = (struct pvscan_aa_params *)handle->custom_handle;
+	struct pv_list *pvl;
+	int incomplete = 0;
 
 	if (vg_is_clustered(vg))
 		return ECMD_PROCESSED;
@@ -281,6 +306,24 @@ static int _pvscan_autoactivate_single(struct cmd_context *cmd, const char *vg_n
 	if (is_lockd_type(vg->lock_type))
 		return ECMD_PROCESSED;
 
+	/*
+	 * This all_vgs case only happens in fallback cases when there's some
+	 * problem preventing the use of lvmetad.  When lvmetad can be properly
+	 * used, the found_vgnames list should have the names of complete VGs
+	 * that should be activated.
+	 */
+	if (pp->all_vgs) {
+		dm_list_iterate_items(pvl, &vg->pvs) {
+			if (!pvl->pv->dev)
+				incomplete++;
+		}
+
+		if (incomplete) {
+			log_print("pvscan[%d] VG %s incomplete (need %d).", getpid(), vg->name, incomplete);
+			return ECMD_PROCESSED;
+		}
+	}
+
 	log_debug("pvscan autoactivating VG %s.", vg_name);
 
 #if 0
@@ -377,6 +420,7 @@ static int _pvscan_autoactivate(struct cmd_context *cmd, struct pvscan_aa_params
 	if (all_vgs) {
 		cmd->cname->flags |= ALL_VGS_IS_DEFAULT;
 		pp->refresh_all = 1;
+		pp->all_vgs = 1;
 	}
 
 	ret = process_each_vg(cmd, 0, NULL, NULL, vgnames, 0, 0, handle, _pvscan_autoactivate_single);
@@ -463,17 +507,23 @@ static int _pvscan_cache(struct cmd_context *cmd, int argc, char **argv)
 	 * Scan all devices when no args are given.
 	 */
 	if (!argc && !devno_args) {
+		_online_files_remove(_vgs_online_dir);
+
 		log_verbose("Scanning all devices.");
 
-		if (!lvmetad_pvscan_all_devs(cmd, 1)) {
+		if (!lvmetad_pvscan_all_devs(cmd, 1, &found_vgnames)) {
 			log_warn("WARNING: Not using lvmetad because cache update failed.");
 			lvmetad_make_unused(cmd);
+			all_vgs = 1;
 		}
 		if (lvmetad_used() && lvmetad_is_disabled(cmd, &reason)) {
 			log_warn("WARNING: Not using lvmetad because %s.", reason);
 			lvmetad_make_unused(cmd);
+			all_vgs = 1;
 		}
-		all_vgs = 1;
+
+		if (!all_vgs && do_activate)
+			log_print("pvscan[%d] activating all complete VGs (no args)", getpid());
 		goto activate;
 	}
 
@@ -485,7 +535,7 @@ static int _pvscan_cache(struct cmd_context *cmd, int argc, char **argv)
 	 * never scan any devices other than those specified.
 	 */
 	if (!lvmetad_token_matches(cmd)) {
-		if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, 0)) {
+		if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, 0, &found_vgnames)) {
 			log_warn("WARNING: Not updating lvmetad because cache update failed.");
 			ret = ECMD_FAILED;
 			goto out;
@@ -493,9 +543,12 @@ static int _pvscan_cache(struct cmd_context *cmd, int argc, char **argv)
 		if (lvmetad_used() && lvmetad_is_disabled(cmd, &reason)) {
 			log_warn("WARNING: Not using lvmetad because %s.", reason);
 			lvmetad_make_unused(cmd);
+			all_vgs = 1;
+			log_print("pvscan[%d] activating all directly (lvmetad disabled from scan) %s", getpid(), dev_arg ?: "");
 		}
-		log_print("pvscan[%d] activating all directly (lvmetad token) %s", getpid(), dev_arg ?: "");
-		all_vgs = 1;
+
+		if (!all_vgs)
+			log_print("pvscan[%d] activating all complete VGs for init", getpid());
 		goto activate;
 	}
 
@@ -807,7 +860,7 @@ int pvscan(struct cmd_context *cmd, int argc, char **argv)
 
 	/* Needed because this command has NO_LVMETAD_AUTOSCAN. */
 	if (lvmetad_used() && (!lvmetad_token_matches(cmd) || lvmetad_is_disabled(cmd, &reason))) {
-		if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, 0)) {
+		if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, 0, NULL)) {
 			log_warn("WARNING: Not using lvmetad because cache update failed.");
 			lvmetad_make_unused(cmd);
 		}
diff --git a/tools/vgcfgrestore.c b/tools/vgcfgrestore.c
index 48a2fa4..e7f9848 100644
--- a/tools/vgcfgrestore.c
+++ b/tools/vgcfgrestore.c
@@ -177,7 +177,7 @@ rescan:
 		}
 		if (!refresh_filters(cmd))
 			stack;
-		if (!lvmetad_pvscan_all_devs(cmd, 1)) {
+		if (!lvmetad_pvscan_all_devs(cmd, 1, NULL)) {
 			log_warn("WARNING: Failed to scan devices.");
 			log_warn("WARNING: Update lvmetad with pvscan --cache.");
 			goto out;
diff --git a/tools/vgimport.c b/tools/vgimport.c
index ea50198..d4455ec 100644
--- a/tools/vgimport.c
+++ b/tools/vgimport.c
@@ -96,7 +96,7 @@ int vgimport(struct cmd_context *cmd, int argc, char **argv)
 	 * import it.
 	 */
 	if (lvmetad_used()) {
-		if (!lvmetad_pvscan_all_devs(cmd, 1)) {
+		if (!lvmetad_pvscan_all_devs(cmd, 1, NULL)) {
 			log_warn("WARNING: Not using lvmetad because cache update failed.");
 			lvmetad_make_unused(cmd);
 		}
diff --git a/tools/vgimportclone.c b/tools/vgimportclone.c
index c4c5d4c..ac3766b 100644
--- a/tools/vgimportclone.c
+++ b/tools/vgimportclone.c
@@ -377,7 +377,7 @@ out:
 		if (!refresh_filters(cmd))
 			stack;
 
-		if (!lvmetad_pvscan_all_devs(cmd, 1)) {
+		if (!lvmetad_pvscan_all_devs(cmd, 1, NULL)) {
 			log_warn("WARNING: Failed to scan devices.");
 			log_warn("WARNING: Update lvmetad with pvscan --cache.");
 		}
diff --git a/tools/vgscan.c b/tools/vgscan.c
index f9fa382..a1ef264 100644
--- a/tools/vgscan.c
+++ b/tools/vgscan.c
@@ -101,7 +101,7 @@ int vgscan(struct cmd_context *cmd, int argc, char **argv)
 		log_verbose("Ignoring vgscan --cache command because lvmetad is not in use.");
 
 	if (lvmetad_used() && (arg_is_set(cmd, cache_long_ARG) || !lvmetad_token_matches(cmd) || lvmetad_is_disabled(cmd, &reason))) {
-		if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, arg_is_set(cmd, cache_long_ARG))) {
+		if (lvmetad_used() && !lvmetad_pvscan_all_devs(cmd, arg_is_set(cmd, cache_long_ARG), NULL)) {
 			log_warn("WARNING: Not using lvmetad because cache update failed.");
 			lvmetad_make_unused(cmd);
 		}
-- 
1.8.3.1

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File bug-1164718_26-pvscan-fix-activation-of-incomplete-VGs.patch of Package lvm2 (Revision 28b680bd18b6885a911f51f5c5303cab)

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