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lvm2/lib/vgcache/vgcache.h

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Add internal cache holding a 'hint' list of the PVs belonging to each VG. A substantial speed-up - particularly in readline mode. If the hints turn out to be wrong, the relevant parts get thrown away. vgscan destroys it totally. In both cases it then rebuilds itself as required.
2001-12-13 03:07:29 +03:00
/*
* Copyright (C) 2001 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*
*/
#ifndef _LVM_VGCACHE_H
#define _LVM_VGCACHE_H
o split the uuid -> device map out from vgcache o roll vgcache back to agk's implementation, we'll revisit this as part of the cluster integration. o change the extra_info field in a label to be a void *
2002-01-15 13:24:48 +03:00
#include <sys/types.h>
#include <asm/page.h>
o Non-caching implementation of new vgcache interface.
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#include "dev-cache.h"
o split the uuid -> device map out from vgcache o roll vgcache back to agk's implementation, we'll revisit this as part of the cluster integration. o change the extra_info field in a label to be a void *
2002-01-15 13:24:48 +03:00
#include "list.h"
o Use new LCK_HOLD flag to indicate whether lock should be held on return from lock_vol() - otherwise it now attempts to acquire the lock and then immediately releases it. o Extend the id field in struct logical_volume to hold VG uuid + LV uuid for format1. This unique lvid can be used directly when calling lock_vol(). o Add the VG uuid to vgcache to make VG uuid lookups possible. (Another step towards using them instead of VG names internally.)
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#include "uuid.h"
#include "toolcontext.h"
Add internal cache holding a 'hint' list of the PVs belonging to each VG. A substantial speed-up - particularly in readline mode. If the hints turn out to be wrong, the relevant parts get thrown away. vgscan destroys it totally. In both cases it then rebuilds itself as required.
2001-12-13 03:07:29 +03:00
o split the uuid -> device map out from vgcache o roll vgcache back to agk's implementation, we'll revisit this as part of the cluster integration. o change the extra_info field in a label to be a void *
2002-01-15 13:24:48 +03:00
struct vgname_entry {
struct list pvdevs;
char *vgname;
o Use new LCK_HOLD flag to indicate whether lock should be held on return from lock_vol() - otherwise it now attempts to acquire the lock and then immediately releases it. o Extend the id field in struct logical_volume to hold VG uuid + LV uuid for format1. This unique lvid can be used directly when calling lock_vol(). o Add the VG uuid to vgcache to make VG uuid lookups possible. (Another step towards using them instead of VG names internally.)
2002-03-05 23:03:09 +03:00
char vgid[ID_LEN + 1];
Merge with text format branch. Lots of changes/very little testing so far => there'll be bugs! Use 'vgcreate -M text' to create a volume group with its metadata stored in text files. Text format metadata changes should be reasonably atomic, with a (basic) automatic recovery mechanism if the system crashes while a change is in progress. Add a metadata section to lvm.conf to specify multiple directories if you want (recommended) to keep multiple copies of the metadata (eg on different filesystems). e.g. metadata { dirs = ["/etc/lvm/metadata1","/usr/local/lvm/metadata2"] } Plenty of refinements still in the pipeline.
2002-04-24 22:20:51 +04:00
struct format_type *fmt;
o split the uuid -> device map out from vgcache o roll vgcache back to agk's implementation, we'll revisit this as part of the cluster integration. o change the extra_info field in a label to be a void *
2002-01-15 13:24:48 +03:00
};
Add internal cache holding a 'hint' list of the PVs belonging to each VG. A substantial speed-up - particularly in readline mode. If the hints turn out to be wrong, the relevant parts get thrown away. vgscan destroys it totally. In both cases it then rebuilds itself as required.
2001-12-13 03:07:29 +03:00
o split the uuid -> device map out from vgcache o roll vgcache back to agk's implementation, we'll revisit this as part of the cluster integration. o change the extra_info field in a label to be a void *
2002-01-15 13:24:48 +03:00
struct pvdev_list {
struct list list;
struct device *dev;
};
Add internal cache holding a 'hint' list of the PVs belonging to each VG. A substantial speed-up - particularly in readline mode. If the hints turn out to be wrong, the relevant parts get thrown away. vgscan destroys it totally. In both cases it then rebuilds itself as required.
2001-12-13 03:07:29 +03:00
o split the uuid -> device map out from vgcache o roll vgcache back to agk's implementation, we'll revisit this as part of the cluster integration. o change the extra_info field in a label to be a void *
2002-01-15 13:24:48 +03:00
int vgcache_init();
void vgcache_destroy();
Add internal cache holding a 'hint' list of the PVs belonging to each VG. A substantial speed-up - particularly in readline mode. If the hints turn out to be wrong, the relevant parts get thrown away. vgscan destroys it totally. In both cases it then rebuilds itself as required.
2001-12-13 03:07:29 +03:00
o split the uuid -> device map out from vgcache o roll vgcache back to agk's implementation, we'll revisit this as part of the cluster integration. o change the extra_info field in a label to be a void *
2002-01-15 13:24:48 +03:00
/* Return list of PVs in named VG */
struct list *vgcache_find(const char *vg_name);
Merge with text format branch. Lots of changes/very little testing so far => there'll be bugs! Use 'vgcreate -M text' to create a volume group with its metadata stored in text files. Text format metadata changes should be reasonably atomic, with a (basic) automatic recovery mechanism if the system crashes while a change is in progress. Add a metadata section to lvm.conf to specify multiple directories if you want (recommended) to keep multiple copies of the metadata (eg on different filesystems). e.g. metadata { dirs = ["/etc/lvm/metadata1","/usr/local/lvm/metadata2"] } Plenty of refinements still in the pipeline.
2002-04-24 22:20:51 +04:00
struct format_type *vgcache_find_format(const char *vg_name);
o Use new LCK_HOLD flag to indicate whether lock should be held on return from lock_vol() - otherwise it now attempts to acquire the lock and then immediately releases it. o Extend the id field in struct logical_volume to hold VG uuid + LV uuid for format1. This unique lvid can be used directly when calling lock_vol(). o Add the VG uuid to vgcache to make VG uuid lookups possible. (Another step towards using them instead of VG names internally.)
2002-03-05 23:03:09 +03:00
struct list *vgcache_find_by_vgid(const char *vgid);
/* FIXME Temporary function */
char *vgname_from_vgid(struct cmd_context *cmd, struct id *vgid);
Add internal cache holding a 'hint' list of the PVs belonging to each VG. A substantial speed-up - particularly in readline mode. If the hints turn out to be wrong, the relevant parts get thrown away. vgscan destroys it totally. In both cases it then rebuilds itself as required.
2001-12-13 03:07:29 +03:00
o split the uuid -> device map out from vgcache o roll vgcache back to agk's implementation, we'll revisit this as part of the cluster integration. o change the extra_info field in a label to be a void *
2002-01-15 13:24:48 +03:00
/* Add/delete a device */
Merge with text format branch. Lots of changes/very little testing so far => there'll be bugs! Use 'vgcreate -M text' to create a volume group with its metadata stored in text files. Text format metadata changes should be reasonably atomic, with a (basic) automatic recovery mechanism if the system crashes while a change is in progress. Add a metadata section to lvm.conf to specify multiple directories if you want (recommended) to keep multiple copies of the metadata (eg on different filesystems). e.g. metadata { dirs = ["/etc/lvm/metadata1","/usr/local/lvm/metadata2"] } Plenty of refinements still in the pipeline.
2002-04-24 22:20:51 +04:00
int vgcache_add(const char *vg_name, const char *vgid, struct device *dev,
struct format_type *fmt);
o split the uuid -> device map out from vgcache o roll vgcache back to agk's implementation, we'll revisit this as part of the cluster integration. o change the extra_info field in a label to be a void *
2002-01-15 13:24:48 +03:00
void vgcache_del(const char *vg_name);
Add internal cache holding a 'hint' list of the PVs belonging to each VG. A substantial speed-up - particularly in readline mode. If the hints turn out to be wrong, the relevant parts get thrown away. vgscan destroys it totally. In both cases it then rebuilds itself as required.
2001-12-13 03:07:29 +03:00
#endif
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