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cf1b05e7dd
used to be a few mis-ordered memory accesses (release and access in the next block). Fix that set_flag could have sometimes corrupted the flags being modified. A few issues with metadata tracking are sorted out as well now, and there are only a few problems remaining before we can integrate lvmetad, mostly on the client side: - metadata areas need to be tracked in lvmetad (most likely to be addressed through an extension of metadata, meaning no special support in lvmetad would be needed) - non-udev scanning code needs to be taught about telling lvmetad about device disappearance (pvscan most importantly) - this last item also needs to mesh with metadata inconsistencies and suddenly-incomplete volume groups (aux disable_dev in tests); udev-based scanning should address this separately and more elegantly
83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/*
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* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LVM_LVMETAD_CLIENT_H
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#define _LVM_LVMETAD_CLIENT_H
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#include "daemon-client.h"
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#include "metadata-exported.h"
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/* Different types of replies we may get from lvmetad. */
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typedef struct {
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daemon_reply r;
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const char **uuids; /* NULL terminated array */
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} lvmetad_uuidlist;
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typedef struct {
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daemon_reply r;
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struct dm_config_tree *cft;
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} lvmetad_vg;
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static inline daemon_handle lvmetad_open();
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static inline void lvmetad_close(daemon_handle h);
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/* Get a list of VG UUIDs that match a given VG name. */
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lvmetad_uuidlist lvmetad_lookup_vgname(daemon_handle h, const char *name);
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/* Get the metadata of a single VG, identified by UUID. */
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lvmetad_vg lvmetad_get_vg(daemon_handle h, const char *uuid);
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/*
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* Add and remove PVs on demand. Udev-driven systems will use this interface
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* instead of scanning.
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*/
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daemon_reply lvmetad_add_pv(daemon_handle h, const char *pv_uuid, const char *mda_content);
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daemon_reply lvmetad_remove_pv(daemon_handle h, const char *pv_uuid);
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/* Trigger a full disk scan, throwing away all caches. XXX do we eventually want
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* this? Probalby not yet, anyway.
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* daemon_reply lvmetad_rescan(daemon_handle h);
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*/
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/*
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* Update the version of metadata of a volume group. The VG has to be locked for
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* writing for this, and the VG metadata here has to match whatever has been
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* written to the disk (under this lock). This initially avoids the requirement
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* for lvmetad to write to disk (in later revisions, lvmetad_supersede_vg may
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* also do the writing, or we probably add another function to do that).
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*/
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daemon_reply lvmetad_supersede_vg(daemon_handle h, struct volume_group *vg);
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/* Implementation of inline functions */
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static inline daemon_handle lvmetad_open(const char *socket)
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{
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/* TODO configurable */
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daemon_info lvmetad_info = {
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.path = "lvmetad",
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.socket = socket ?: "/var/run/lvm/lvmetad.socket",
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.autostart = 1
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};
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return daemon_open(lvmetad_info);
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}
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static inline void lvmetad_close(daemon_handle h)
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{
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return daemon_close(h);
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}
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#endif
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