From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18020 invoked by alias); 14 Apr 2010 13:09:19 -0000 Received: (qmail 17832 invoked by uid 9796); 14 Apr 2010 13:09:19 -0000 Date: Wed, 14 Apr 2010 13:09:00 -0000 Message-ID: <20100414130919.17802.qmail@sourceware.org> From: prajnoha@sourceware.org To: lvm-devel@redhat.com, lvm2-cvs@sourceware.org Subject: LVM2 ./WHATS_NEW lib/format_text/archiver.c li ... Mailing-List: contact lvm2-cvs-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: lvm2-cvs-owner@sourceware.org X-SW-Source: 2010-04/txt/msg00083.txt.bz2 CVSROOT: /cvs/lvm2 Module name: LVM2 Changes by: prajnoha@sourceware.org 2010-04-14 13:09:17 Modified files: . : WHATS_NEW lib/format_text: archiver.c format-text.c lib/metadata : metadata-exported.h metadata.c Log message: Do not reset position in metadata ring buffer on vgrename and vgcfgrestore. We should write metadata into next position in the ring buffer while calling vgrename and vgcfgrestore. At this code level (_vg_write_raw), we were not able to determine if this is a rename or not. If yes, then accompanying VG structure passed here has a new name set, not the old one. When looking for a location where to put metadata next, we were given a NULL value because of failed VG name comparison (in _find_vg_rlocn) between the name in existing metadata and metadata we're just about to write. This resets the position in the ring buffer, overwriting any existing metadata (and also incorrectly updates the cache to "orphan" afterwards). This patch just adds old_name item in struct volume_group that we can check and use if necessary and detect renames at lower layers as well. The same applies for vgcfgrestore, but here we're using a special value of old_name, an empty string, to disable the check with existing metadata totally. Patches: http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW.diff?cvsroot=lvm2&r1=1.1519&r2=1.1520 http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/lib/format_text/archiver.c.diff?cvsroot=lvm2&r1=1.29&r2=1.30 http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/lib/format_text/format-text.c.diff?cvsroot=lvm2&r1=1.120&r2=1.121 http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/lib/metadata/metadata-exported.h.diff?cvsroot=lvm2&r1=1.141&r2=1.142 http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/lib/metadata/metadata.c.diff?cvsroot=lvm2&r1=1.336&r2=1.337 --- LVM2/WHATS_NEW 2010/04/14 13:03:06 1.1519 +++ LVM2/WHATS_NEW 2010/04/14 13:09:16 1.1520 @@ -1,5 +1,6 @@ Version 2.02.63 - ================================ + Do not reset position in metadata ring buffer on vgrename and vgcfgrestore. Allow VGs with active LVs to be renamed. Use UUIDs instead of names while processing event handlers. Only pass visible LVs to tools in cmdline VG name/tag expansions without -a. --- LVM2/lib/format_text/archiver.c 2009/09/14 19:44:16 1.29 +++ LVM2/lib/format_text/archiver.c 2010/04/14 13:09:16 1.30 @@ -306,6 +306,12 @@ return 0; } + /* + * Setting vg->old_name to a blank value will explicitly + * disable any attempt to check VG name in existing metadata. + */ + vg->old_name = dm_pool_strdup(vg->vgmem, ""); + /* Add any metadata areas on the PVs */ dm_list_iterate_items(pvl, &vg->pvs) { pv = pvl->pv; --- LVM2/lib/format_text/format-text.c 2010/03/16 17:30:01 1.120 +++ LVM2/lib/format_text/format-text.c 2010/04/14 13:09:16 1.121 @@ -380,6 +380,17 @@ } else *precommitted = 0; + /* Do not check non-existent metadata. */ + if (!rlocn->offset && !rlocn->size) + return NULL; + + /* + * Don't try to check existing metadata + * if given vgname is an empty string. + */ + if (!*vgname) + return rlocn; + /* FIXME Loop through rlocns two-at-a-time. List null-terminated. */ /* FIXME Ignore if checksum incorrect!!! */ if (!dev_read(dev_area->dev, dev_area->start + rlocn->offset, @@ -387,9 +398,11 @@ goto_bad; if (!strncmp(vgnamebuf, vgname, len = strlen(vgname)) && - (isspace(vgnamebuf[len]) || vgnamebuf[len] == '{')) { + (isspace(vgnamebuf[len]) || vgnamebuf[len] == '{')) return rlocn; - } + else + log_debug("Volume group name found in metadata does " + "not match expected name %s.", vgname); bad: if ((info = info_from_pvid(dev_area->dev->pvid, 0))) @@ -542,7 +555,8 @@ if (!(mdah = _raw_read_mda_header(fid->fmt, &mdac->area))) goto_out; - rlocn = _find_vg_rlocn(&mdac->area, mdah, vg->name, &noprecommit); + rlocn = _find_vg_rlocn(&mdac->area, mdah, + vg->old_name ? vg->old_name : vg->name, &noprecommit); mdac->rlocn.offset = _next_rlocn_offset(rlocn, mdah); if (!fidtc->raw_metadata_buf && @@ -647,7 +661,9 @@ if (!(mdah = _raw_read_mda_header(fid->fmt, &mdac->area))) goto_out; - if (!(rlocn = _find_vg_rlocn(&mdac->area, mdah, vg->name, &noprecommit))) { + if (!(rlocn = _find_vg_rlocn(&mdac->area, mdah, + vg->old_name ? vg->old_name : vg->name, + &noprecommit))) { mdah->raw_locns[0].offset = 0; mdah->raw_locns[0].size = 0; mdah->raw_locns[0].checksum = 0; --- LVM2/lib/metadata/metadata-exported.h 2010/04/13 17:26:36 1.141 +++ LVM2/lib/metadata/metadata-exported.h 2010/04/14 13:09:17 1.142 @@ -227,6 +227,7 @@ struct id id; char *name; + char *old_name; /* Set during vgrename and vgcfgrestore */ char *system_id; uint32_t extent_size; --- LVM2/lib/metadata/metadata.c 2010/04/13 17:26:36 1.336 +++ LVM2/lib/metadata/metadata.c 2010/04/14 13:09:17 1.337 @@ -457,6 +457,8 @@ struct dm_pool *mem = vg->vgmem; struct pv_list *pvl; + vg->old_name = vg->name; + if (!(vg->name = dm_pool_strdup(mem, new_name))) { log_error("vg->name allocation failed for '%s'", new_name); return 0; @@ -2428,11 +2430,15 @@ } } - /* - * Instruct remote nodes to upgrade cached metadata. - */ - if (cache_updated) + if (cache_updated) { + /* Instruct remote nodes to upgrade cached metadata. */ remote_commit_cached_metadata(vg); + /* + * We need to clear old_name after a successful commit. + * The volume_group structure could be reused later. + */ + vg->old_name = NULL; + } /* If update failed, remove any cached precommitted metadata. */ if (!cache_updated && !drop_cached_metadata(vg))