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9c159ea320
Add 3rd daemon return state "unknown" for lookups that are carried out successfully but don't find the item requested. Avoid issuing error messages when it's expected that a device that's being looked up in lvmetad might not be there.
128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/*
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* Copyright (C) 2012 Red Hat, Inc.
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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_METAD_H
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#define _LVM_METAD_H
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struct volume_group;
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struct cmd_context;
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struct dm_config_tree;
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#ifdef LVMETAD_SUPPORT
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/*
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* Initialise the communication with lvmetad. Normally called by
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* lvmcache_init. Sets up a global handle for our process.
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*/
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void lvmetad_init(void);
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/*
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* Override the use of lvmetad for retrieving scan results and metadata.
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*/
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void lvmetad_set_active(int);
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/*
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* Check whether lvmetad is active (where active means both that it is running
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* and that we have a working connection with it).
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*/
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int lvmetad_active(void);
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/*
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* Send a new version of VG metadata to lvmetad. This is normally called after
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* vg_write but before vg_commit. After vg_commit, lvmetad_vg_commit is called
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* to seal the transaction. The result of lvmetad_vg_update is that the new
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* metadata is stored tentatively in lvmetad, but it is not used until
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* lvmetad_vg_commit. The request is validated immediately and lvmetad_vg_commit
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* only constitutes a pointer update.
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*/
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int lvmetad_vg_update(struct volume_group *vg);
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/*
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* Inform lvmetad that a VG has been removed. This is not entirely safe, but is
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* only needed during vgremove, which does not wipe PV labels and therefore
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* cannot mark the PVs as gone.
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*/
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int lvmetad_vg_remove(struct volume_group *vg);
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/*
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* Notify lvmetad that a PV has been found. It is not an error if the PV is
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* already marked as present in lvmetad. If a non-NULL vg pointer is supplied,
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* it is taken to represent the metadata read from the MDA(s) present on that
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* PV. It *is* an error if: the VG is already known to lvmetad, the sequence
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* number on the cached and on the discovered PV match but the metadata content
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* does not.
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*/
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int lvmetad_pv_found(struct id pvid, struct device *device,
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const struct format_type *fmt, uint64_t label_sector,
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struct volume_group *vg);
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/*
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* Inform the daemon that the device no longer exists. We do not support
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* multiple device names, so this needs a unique and stable name, the same as
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* provided to lvmetad_pv_found.
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*/
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int lvmetad_pv_gone(struct device *dev);
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/*
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* Request a list of all PVs available to lvmetad. If requested, this will also
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* read labels off all the PVs to populate lvmcache.
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*/
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int lvmetad_pv_list_to_lvmcache(struct cmd_context *cmd);
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/*
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* Lookup an individual PV.
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* If found is not NULL, it is set according to whether or not the PV is found,
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* otherwise if the PV is not found an error is returned.
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*/
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int lvmetad_pv_lookup(struct cmd_context *cmd, struct id pvid, int *found);
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int lvmetad_pv_lookup_by_dev(struct cmd_context *cmd, struct device *dev, int *found);
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/*
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* Request a list of all VGs available to lvmetad and use it to fill in
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* lvmcache..
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*/
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int lvmetad_vg_list_to_lvmcache(struct cmd_context *cmd);
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/*
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* Find a VG by its ID or its name in the lvmetad cache. Gives NULL if the VG is
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* not found.
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*/
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struct volume_group *lvmetad_vg_lookup(struct cmd_context *cmd,
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const char *vgname, const char *vgid);
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/*
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* Scan a single device and update lvmetad with the result(s). If the device
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* node does not exist, it must be supplied in a major:minor format.
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*/
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int pvscan_lvmetad_single(struct cmd_context *cmd, const char *pv_name);
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# else /* LVMETAD_SUPPORT */
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# define lvmetad_init() do { } while (0)
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# define lvmetad_set_active(a) do { } while (0)
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# define lvmetad_active() (0)
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# define lvmetad_vg_update(vg) (1)
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# define lvmetad_vg_remove(vg) (1)
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# define lvmetad_pv_found(pvid, device, fmt, label_sector, vg) (1)
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# define lvmetad_pv_gone(dev) (1)
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# define lvmetad_pv_list_to_lvmcache(cmd) (1)
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# define lvmetad_pv_lookup(cmd, pvid, found) (0)
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# define lvmetad_pv_lookup_by_dev(cmd, dev, found) (0)
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# define lvmetad_vg_list_to_lvmcache(cmd) (1)
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# define lvmetad_vg_lookup(cmd, vgname, vgid) (NULL)
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# define pvscan_lvmetad(cmd, argc, argv) (0)
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# endif /* LVMETAD_SUPPORT */
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#endif
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