mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-22 17:35:59 +03:00
4dc5d4ac7e
error reading dev and no pvid on dev were both returning 0. make it easier for callers to know which, if they care. return 1 if the device could be read, regardless of whether a pvid was found or not. set has_pvid=1 if a pvid is found and 0 if no pvid is found.
137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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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_LABEL_H
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#define _LVM_LABEL_H
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#include "lib/uuid/uuid.h"
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#include "lib/device/device.h"
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#include "lib/device/bcache.h"
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#define LABEL_ID "LABELONE"
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#define LABEL_SIZE SECTOR_SIZE /* Think very carefully before changing this */
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#define LABEL_SCAN_SECTORS 4L
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#define LABEL_SCAN_SIZE (LABEL_SCAN_SECTORS << SECTOR_SHIFT)
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struct labeller;
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struct dev_filter;
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struct cmd_context;
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struct logical_volume;
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/* On disk - 32 bytes */
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struct label_header {
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int8_t id[8]; /* LABELONE */
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uint64_t sector_xl; /* Sector number of this label */
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uint32_t crc_xl; /* From next field to end of sector */
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uint32_t offset_xl; /* Offset from start of struct to contents */
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int8_t type[8]; /* LVM2 001 */
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} __attribute__ ((packed));
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/* In core */
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struct label {
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char type[8];
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uint64_t sector;
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struct labeller *labeller;
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struct device *dev;
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void *info;
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};
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struct labeller;
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struct label_ops {
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/*
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* Is the device labelled with this format ?
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*/
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int (*can_handle) (struct labeller * l, void *buf, uint64_t sector);
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/*
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* Write a label to a volume.
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*/
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int (*write) (struct label * label, void *buf);
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/*
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* Read a label from a volume.
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*/
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int (*read) (struct cmd_context *cmd, struct labeller * l, struct device * dev,
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void *label_buf, uint64_t label_sector, int *is_duplicate);
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/*
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* Populate label_type etc.
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*/
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int (*initialise_label) (struct labeller * l, struct label * label);
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/*
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* Destroy a previously read label.
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*/
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void (*destroy_label) (struct labeller * l, struct label * label);
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/*
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* Destructor.
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*/
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void (*destroy) (struct labeller * l);
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};
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struct labeller {
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struct label_ops *ops;
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const struct format_type *fmt;
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};
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int label_init(void);
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void label_exit(void);
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int label_register_handler(struct labeller *handler);
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struct labeller *label_get_handler(const char *name);
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int label_remove(struct device *dev);
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int label_write(struct device *dev, struct label *label);
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struct label *label_create(struct labeller *labeller);
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void label_destroy(struct label *label);
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extern struct bcache *scan_bcache;
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int label_scan(struct cmd_context *cmd);
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int label_scan_devs(struct cmd_context *cmd, struct dev_filter *f, struct dm_list *devs);
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int label_scan_devs_cached(struct cmd_context *cmd, struct dev_filter *f, struct dm_list *devs);
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int label_scan_devs_rw(struct cmd_context *cmd, struct dev_filter *f, struct dm_list *devs);
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int label_scan_devs_excl(struct cmd_context *cmd, struct dev_filter *f, struct dm_list *devs);
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int label_scan_dev(struct device *dev);
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void label_scan_invalidate(struct device *dev);
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void label_scan_invalidate_lv(struct cmd_context *cmd, struct logical_volume *lv);
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void label_scan_drop(struct cmd_context *cmd);
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void label_scan_destroy(struct cmd_context *cmd);
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int label_scan_setup_bcache(void);
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int label_scan_open(struct device *dev);
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int label_scan_open_excl(struct device *dev);
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int label_scan_open_rw(struct device *dev);
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int label_scan_reopen_rw(struct device *dev);
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int label_read_pvid(struct device *dev, int *has_pvid);
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int label_scan_for_pvid(struct cmd_context *cmd, char *pvid, struct device **dev_out);
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/*
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* Wrappers around bcache equivalents.
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* (these make it easier to disable bcache and revert to direct rw if needed)
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*/
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bool dev_read_bytes(struct device *dev, uint64_t start, size_t len, void *data);
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bool dev_write_bytes(struct device *dev, uint64_t start, size_t len, void *data);
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bool dev_write_zeros(struct device *dev, uint64_t start, size_t len);
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bool dev_set_bytes(struct device *dev, uint64_t start, size_t len, uint8_t val);
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bool dev_invalidate_bytes(struct device *dev, uint64_t start, size_t len);
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void dev_set_last_byte(struct device *dev, uint64_t offset);
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void dev_unset_last_byte(struct device *dev);
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#endif
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