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revised flags and comments

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This commit is contained in:
Alasdair Kergon 2001-10-05 13:03:03 +00:00
parent b82172a98a
commit f09fdc28fa
1 changed files with 31 additions and 48 deletions
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79
lib/metadata/metadata.h
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@ -20,33 +20,29 @@
/* Various flags */
/* Note that the bits no longer necessarily correspond to LVM1 disk format */
/* Status bits */
#define ST_ACTIVE 0x01 /* PV VG LV */
#define ST_EXPORTED_VG 0x02 /* VG */ /* And PV too perhaps? */
#define ST_EXTENDABLE_VG 0x04 /* VG */
#define ST_ALLOCATED_PV 0x08 /* PV */
#define ST_SPINDOWN_LV 0x10 /* LV */
#define ACTIVE 0x00000001 /* PV VG LV */
#define EXPORTED_VG 0x00000002 /* VG */ /* And PV too perhaps? */
#define EXTENDABLE_VG 0x00000004 /* VG */
#define ALLOCATED_PV 0x00000008 /* PV */
/* Access bits */
#define AC_READ 0x01 /* LV VG */
#define AC_WRITE 0x02 /* LV VG */
#define AC_CLUSTERED 0x04 /* VG */
#define AC_SHARED 0x08 /* VG */
#define SPINDOWN_LV 0x00000010 /* LV */
#define BADBLOCK_ON 0x00000020 /* LV */
/* LV Flags */
#define LV_ALLOC_STRICT 0x01 /* LV */
#define LV_ALLOC_CONTIGUOUS 0x02 /* LV */
#define LV_SNAPSHOT 0x04 /* LV */
#define LV_SNAPSHOT_ORG 0x08 /* LV */
#define LV_BADBLOCK_ON 0x10 /* LV */
#define LVM_READ 0x00000100 /* LV VG */
#define LVM_WRITE 0x00000200 /* LV VG */
#define CLUSTERED 0x00000400 /* VG */
#define SHARED 0x00000800 /* VG */
#define ALLOC_STRICT 0x00001000 /* LV */
#define ALLOC_CONTIGUOUS 0x00002000 /* LV */
#define SNAPSHOT 0x00004000 /* LV */
#define SNAPSHOT_ORG 0x00008000 /* LV */
#define EXPORTED_TAG "PV_EXP" /* Identifier of exported PV */
#define IMPORTED_TAG "PV_IMP" /* Identifier of imported PV */
struct id {
uint8_t uuid[ID_LEN];
};
@ -54,7 +50,7 @@ struct id {
struct physical_volume {
struct id *id;
struct device *dev;
char *vg_name;
char *vg_name; /* VG component of name only - not full path */
char *exported;
uint32_t status;
@ -75,11 +71,9 @@ struct pe_specifier {
struct logical_volume {
/* disk */
struct id *id;
char *name;
char *name; /* LV component of name only - not full path */
uint32_t status;
uint32_t access;
uint32_t flags;
uint32_t open;
uint64_t size;
@ -91,10 +85,9 @@ struct logical_volume {
struct volume_group {
struct id *id;
char *name;
char *name; /* VG component of name only - not full path */
uint32_t status;
uint32_t access;
uint64_t extent_size;
uint32_t extent_count;
@ -124,7 +117,7 @@ struct pv_list {
/* ownership of returned objects passes */
struct io_space {
/* Returns list of names of all vgs */
/* Returns list of names of all vgs - vg component only, not full path*/
struct name_list *(*get_vgs)(struct io_space *is);
/* Returns list of fully-populated pv structures */
@ -135,43 +128,33 @@ struct io_space {
const char *pv_name);
/* Write a PV structure to disk. */
/* Fails if the PV is in a VG ie vg_name filled on the disk or in *pv */
/* Fails if the PV is in a VG ie pv->vg_name must be null */
int (*pv_write)(struct io_space *is, struct physical_volume *pv);
/* vg_name may contain slash(es) - if not, this function adds prefix */
/* Default prefix is '/dev/' but can be changed from config file? */
/* (via a prefix_set() ?) */
/* if vg_name doesn't contain any slash, this function adds prefix */
struct volume_group *(*vg_read)(struct io_space *is,
const char *vg_name);
/* Write out complete VG metadata. */
/* Ensure (& impose?) consistency before writing anything.
/* Ensure *internal* consistency before writing anything.
* eg. PEs can't refer to PVs not part of the VG
* Order write sequence to aid recovery if process is aborted
* (eg flush entire set of changes to each disk in turn?)
* If overwriting existing VG data, needs to check for any PVs
* removed from the VG and update those PVs too. If those PVs
* are no longer in use, blank out vg_name on them. Otherwise
* set vg_name to something temporary and unique - this must be
* a vgsplit with another vg_write() about to follow (or set a new
* status flag?)
* OR Should all consistency checks on the *_write*
* functions here be handled by a wrapper around them, so that they
* *are* capable of leaving the system in an unusable state?
* OR Should vgsplit set flags to modify vg_write behaviour,
* even specifying the new vg_name to insert?
* (eg flush entire set of changes to each disk in turn)
* It is the responsibility of the caller to ensure external
* consistency, eg by calling pv_write() if removing PVs from a VG
* or calling vg_write() a second time if splitting a VG into two.
* vg_write() must not read or write from any PVs not included
* in the volume_group structure it is handed.
*/
int (*vg_write)(struct io_space *is, struct volume_group *vg);
void (*destroy)(struct io_space *is);
/* Current volume group prefix. */
char *prefix = '/dev/';
struct dev_filter *filter;
void *private;
/* Something here to allow repair tools & --force options to */
/* set flags to override certain consistency checks */
/* eg. in _write functions to allow restoration of metadata */
/* & in _read functions to allow "gaps" and specify which of */
/* conflicting copies of metadata to use (device restriction?) */
};
/* FIXME: Move to other files */
@ -205,7 +188,7 @@ int lv_add(struct volume_group *vg, struct logical_volume *lv);
/* Remove an LV from a given VG */
int lv_remove(struct volume_group *vg, struct logical_volume *lv);
/* Return the VG that contains a given LV (based on path given in lv_name) */
/* ? Return the VG that contains a given LV (based on path given in lv_name) */
/* (or environment var?) */
struct volume_group *vg_find(const char *lv_name);