mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-21 13:34:40 +03:00
db98a6e362
If udev info is missing for a device, (which would indicate if it's an MD component), then do an end-of-device read to check if a PV is an MD component. (This is skipped when using hints since we already know devs in hints are good.) A new config setting md_component_checks can be used to disable the additional end-of-device MD checks, or to always enable end-of-device MD checks. When both hints and udev info are disabled/unavailable, the end of PVs will now be scanned by default. If md devices with end-of-device superblocks are not being used, the extra I/O overhead can be avoided by setting md_component_checks="start".
162 lines
5.2 KiB
C
162 lines
5.2 KiB
C
/*
|
|
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
|
|
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This file is part of LVM2.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU Lesser General Public License v.2.1.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef _LVM_DEVICE_H
|
|
#define _LVM_DEVICE_H
|
|
|
|
#include "lib/uuid/uuid.h"
|
|
|
|
#include <fcntl.h>
|
|
|
|
#define DEV_REGULAR 0x00000002 /* Regular file? */
|
|
#define DEV_ALLOCED 0x00000004 /* malloc used */
|
|
#define DEV_OPENED_RW 0x00000008 /* Opened RW */
|
|
#define DEV_OPENED_EXCL 0x00000010 /* Opened EXCL */
|
|
#define DEV_O_DIRECT 0x00000020 /* Use O_DIRECT */
|
|
#define DEV_O_DIRECT_TESTED 0x00000040 /* DEV_O_DIRECT is reliable */
|
|
#define DEV_OPEN_FAILURE 0x00000080 /* Has last open failed? */
|
|
#define DEV_USED_FOR_LV 0x00000100 /* Is device used for an LV */
|
|
#define DEV_ASSUMED_FOR_LV 0x00000200 /* Is device assumed for an LV */
|
|
#define DEV_NOT_O_NOATIME 0x00000400 /* Don't use O_NOATIME */
|
|
#define DEV_IN_BCACHE 0x00000800 /* dev fd is open and used in bcache */
|
|
#define DEV_BCACHE_EXCL 0x00001000 /* bcache_fd should be open EXCL */
|
|
#define DEV_FILTER_AFTER_SCAN 0x00002000 /* apply filter after bcache has data */
|
|
#define DEV_FILTER_OUT_SCAN 0x00004000 /* filtered out during label scan */
|
|
#define DEV_BCACHE_WRITE 0x00008000 /* bcache_fd is open with RDWR */
|
|
#define DEV_SCAN_FOUND_LABEL 0x00010000 /* label scan read dev and found label */
|
|
#define DEV_IS_MD_COMPONENT 0x00020000 /* device is an md component */
|
|
#define DEV_UDEV_INFO_MISSING 0x00040000 /* we have no udev info for this device */
|
|
|
|
/*
|
|
* Support for external device info.
|
|
* Any new external device info source needs to be
|
|
* registered using EXT_REGISTER macro in dev-ext.c.
|
|
*/
|
|
typedef enum dev_ext_e {
|
|
DEV_EXT_NONE,
|
|
DEV_EXT_UDEV,
|
|
DEV_EXT_NUM
|
|
} dev_ext_t;
|
|
|
|
struct dev_ext {
|
|
int enabled;
|
|
dev_ext_t src;
|
|
void *handle;
|
|
};
|
|
|
|
/*
|
|
* All devices in LVM will be represented by one of these.
|
|
* pointer comparisons are valid.
|
|
*/
|
|
struct device {
|
|
struct dm_list aliases; /* struct dm_str_list */
|
|
dev_t dev;
|
|
|
|
/* private */
|
|
int fd;
|
|
int open_count;
|
|
int phys_block_size;
|
|
int block_size;
|
|
int read_ahead;
|
|
int bcache_fd;
|
|
uint32_t flags;
|
|
unsigned size_seqno;
|
|
uint64_t size;
|
|
uint64_t end;
|
|
struct dev_ext ext;
|
|
const char *duplicate_prefer_reason;
|
|
|
|
const char *vgid; /* if device is an LV */
|
|
const char *lvid; /* if device is an LV */
|
|
|
|
char pvid[ID_LEN + 1]; /* if device is a PV */
|
|
char _padding[7];
|
|
};
|
|
|
|
/*
|
|
* All I/O is annotated with the reason it is performed.
|
|
*/
|
|
typedef enum dev_io_reason {
|
|
DEV_IO_SIGNATURES = 0, /* Scanning device signatures */
|
|
DEV_IO_LABEL, /* LVM PV disk label */
|
|
DEV_IO_MDA_HEADER, /* Text format metadata area header */
|
|
DEV_IO_MDA_CONTENT, /* Text format metadata area content */
|
|
DEV_IO_MDA_EXTRA_HEADER, /* Header of any extra metadata areas on device */
|
|
DEV_IO_MDA_EXTRA_CONTENT, /* Content of any extra metadata areas on device */
|
|
DEV_IO_FMT1, /* Original LVM1 metadata format */
|
|
DEV_IO_POOL, /* Pool metadata format */
|
|
DEV_IO_LV, /* Content written to an LV */
|
|
DEV_IO_LOG /* Logging messages */
|
|
} dev_io_reason_t;
|
|
|
|
struct device_list {
|
|
struct dm_list list;
|
|
struct device *dev;
|
|
};
|
|
|
|
struct device_area {
|
|
struct device *dev;
|
|
uint64_t start; /* Bytes */
|
|
uint64_t size; /* Bytes */
|
|
};
|
|
|
|
/*
|
|
* Support for external device info.
|
|
*/
|
|
const char *dev_ext_name(struct device *dev);
|
|
int dev_ext_enable(struct device *dev, dev_ext_t src);
|
|
int dev_ext_disable(struct device *dev);
|
|
struct dev_ext *dev_ext_get(struct device *dev);
|
|
int dev_ext_release(struct device *dev);
|
|
|
|
/*
|
|
* Increment current dev_size_seqno.
|
|
* This is used to control lifetime
|
|
* of cached device size.
|
|
*/
|
|
void dev_size_seqno_inc(void);
|
|
|
|
/*
|
|
* All io should use these routines.
|
|
*/
|
|
int dev_get_block_size(struct device *dev, unsigned int *phys_block_size, unsigned int *block_size);
|
|
int dev_get_size(struct device *dev, uint64_t *size);
|
|
int dev_get_read_ahead(struct device *dev, uint32_t *read_ahead);
|
|
int dev_discard_blocks(struct device *dev, uint64_t offset_bytes, uint64_t size_bytes);
|
|
|
|
/* Use quiet version if device number could change e.g. when opening LV */
|
|
int dev_open(struct device *dev);
|
|
int dev_open_quiet(struct device *dev);
|
|
int dev_open_flags(struct device *dev, int flags, int direct, int quiet);
|
|
int dev_open_readonly(struct device *dev);
|
|
int dev_open_readonly_buffered(struct device *dev);
|
|
int dev_open_readonly_quiet(struct device *dev);
|
|
int dev_close(struct device *dev);
|
|
int dev_close_immediate(struct device *dev);
|
|
|
|
int dev_fd(struct device *dev);
|
|
const char *dev_name(const struct device *dev);
|
|
|
|
void dev_flush(struct device *dev);
|
|
|
|
struct device *dev_create_file(const char *filename, struct device *dev,
|
|
struct dm_str_list *alias, int use_malloc);
|
|
void dev_destroy_file(struct device *dev);
|
|
|
|
/* Return a valid device name from the alias list; NULL otherwise */
|
|
const char *dev_name_confirmed(struct device *dev, int quiet);
|
|
|
|
#endif
|