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214 lines
8.3 KiB
C
214 lines
8.3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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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#include "config-util.h"
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#include <stdint.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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enum activation_change;
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typedef int (*activation_handler) (struct cmd_context *cmd,
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const char *vgname, const char *vgid,
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int partial, int changed,
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enum activation_change activate);
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#ifdef LVMETAD_SUPPORT
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/*
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* lvmetad_connect: connect to lvmetad
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* lvmetad_disconnect: disconnect from lvmetad
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* lvmetad_make_unused: disconnect from lvmetad and refresh cmd filter
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* lvmetad_used: check if lvmetad is being used (i.e. is connected)
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*/
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int lvmetad_connect(struct cmd_context *cmd);
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void lvmetad_disconnect(void);
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void lvmetad_make_unused(struct cmd_context *cmd);
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int lvmetad_used(void);
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/*
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* Configure the socket that lvmetad_init will use to connect to the daemon.
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*/
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void lvmetad_set_socket(const char *);
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/*
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* Check if lvmetad socket is present (either the one set by lvmetad_set_socket
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* or the default one if not set).
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*/
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int lvmetad_socket_present(void);
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/*
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* Check if lvmetad pidfile is present, indicating that the lvmetad
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* process is running or not.
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*/
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int lvmetad_pidfile_present(void);
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/*
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* Set the "lvmetad validity token" (currently only consists of the lvmetad
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* filter. See lvm.conf.
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*/
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void lvmetad_set_token(const struct dm_config_value *filter);
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/*
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* Release allocated token.
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*/
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void lvmetad_release_token(void);
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// FIXME What's described here doesn't appear to be implemented yet.
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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_pending(struct volume_group *vg);
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int lvmetad_vg_update_finish(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_pending(struct volume_group *vg);
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int lvmetad_vg_remove_finish(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 cmd_context *cmd, const struct id *pvid, struct device *dev,
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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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struct dm_list *found_vgnames,
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struct dm_list *changed_vgnames);
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/*
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* Inform the daemon that the device no longer exists.
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*/
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int lvmetad_pv_gone(dev_t devno, const char *pv_name);
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int lvmetad_pv_gone_by_dev(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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* Request a list of vgid/vgname pairs for all VGs known to lvmetad.
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* Does not do vg_lookup's on each VG, and does not populate lvmcache.
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*/
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int lvmetad_get_vgnameids(struct cmd_context *cmd, struct dm_list *vgnameids);
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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).
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*/
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int lvmetad_pvscan_single(struct cmd_context *cmd, struct device *dev,
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struct dm_list *found_vgnames,
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struct dm_list *changed_vgnames);
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int lvmetad_pvscan_all_devs(struct cmd_context *cmd, int do_wait);
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int lvmetad_vg_clear_outdated_pvs(struct volume_group *vg);
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void lvmetad_validate_global_cache(struct cmd_context *cmd, int force);
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int lvmetad_token_matches(struct cmd_context *cmd);
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int lvmetad_vg_is_foreign(struct cmd_context *cmd, const char *vgname, const char *vgid);
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int lvmetad_is_disabled(struct cmd_context *cmd, const char **reason);
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void lvmetad_set_disabled(struct cmd_context *cmd, const char *reason);
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void lvmetad_clear_disabled(struct cmd_context *cmd);
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# else /* LVMETAD_SUPPORT */
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static inline int lvmetad_connect(struct cmd_context *cmd) {return 0;}
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static inline void lvmetad_disconnect(void) {}
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static inline void lvmetad_make_unused(struct cmd_context *cmd) {}
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static inline int lvmetad_used(void) {return 0;}
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static inline void lvmetad_set_socket(const char *thing) {}
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static inline int lvmetad_socket_present(void) {return 0;}
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static inline int lvmetad_pidfile_present(void) {return 0;}
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static inline void lvmetad_set_token(const struct dm_config_value *filter) {}
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static inline void lvmetad_release_token(void) {}
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static inline int lvmetad_vg_update_pending(struct volume_group *vg) {return 1;}
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static inline int lvmetad_vg_update_finish(struct volume_group *vg) {return 1;}
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static inline int lvmetad_vg_remove_pending(struct volume_group *vg) {return 1;}
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static inline int lvmetad_vg_remove_finish(struct volume_group *vg) {return 1;}
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static inline int lvmetad_pv_found(struct cmd_context *cmd, const struct id *pvid, struct device *dev,
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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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struct dm_list *found_vgnames,
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struct dm_list *changed_vgnames) {return 1;}
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static inline int lvmetad_pv_gone(dev_t devno, const char *pv_name) {return 1;}
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static inline int lvmetad_pv_gone_by_dev(struct device *dev) {return 1;}
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static inline int lvmetad_pv_list_to_lvmcache(struct cmd_context *cmd) {return 1;}
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static inline int lvmetad_pv_lookup(struct cmd_context *cmd, struct id pvid, int *found) {return 0;}
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static inline int lvmetad_pv_lookup_by_dev(struct cmd_context *cmd, struct device *dev, int *found) {return 0;}
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static inline int lvmetad_vg_list_to_lvmcache(struct cmd_context *cmd) {return 1;}
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static inline int lvmetad_get_vgnameids(struct cmd_context *cmd, struct dm_list *vgnameids) {return 0;}
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static inline struct volume_group *lvmetad_vg_lookup(struct cmd_context *cmd,
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const char *vgname, const char *vgid) {return NULL;}
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static inline int lvmetad_pvscan_single(struct cmd_context *cmd, struct device *dev,
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struct dm_list *found_vgnames,
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struct dm_list *changed_vgnames) {return 0;}
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static inline int lvmetad_pvscan_all_devs(struct cmd_context *cmd, int do_wait) {return 0;}
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static inline int lvmetad_vg_clear_outdated_pvs(struct volume_group *vg) {return 0;}
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static inline void lvmetad_validate_global_cache(struct cmd_context *cmd, int force) {}
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static inline int lvmetad_token_matches(struct cmd_context *cmd) {return 1;}
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static inline int lvmetad_vg_is_foreign(struct cmd_context *cmd, const char *vgname, const char *vgid) {return 0;}
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static inline int lvmetad_is_disabled(struct cmd_context *cmd, const char **reason) {return 0;}
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static inline void lvmetad_set_disabled(struct cmd_context *cmd, const char *reason) {}
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static inline void lvmetad_clear_disabled(struct cmd_context *cmd) {}
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# endif /* LVMETAD_SUPPORT */
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#endif
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