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The checkpoints are another way of keeping the state of ZFS. During the rewind, the pool has to be exported. This makes checkpoints unusable when using ZFS as root. Add the option to rewind the ZFS checkpoint at the boot time. If checkpoint exists, a new option for rewinding a checkpoint will appear in the bootloader menu. We fully support boot environments. If the rewind option is selected, the boot loader will show a list of boot environments that existed before the checkpoint. Reviewed by: tsoome, allanjude, kevans (ok with high-level overview) Differential Revision: https://reviews.freebsd.org/D24920
134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/*-
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* Copyright (c) 2012 Andriy Gapon <avg@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <zfsimpl.h>
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#ifdef LOADER_GELI_SUPPORT
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#include <crypto/intake.h>
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#endif
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#ifndef _BOOT_LIBZFS_H_
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#define _BOOT_LIBZFS_H_
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#define ZFS_MAXNAMELEN 256
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/*
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* ZFS fully-qualified device descriptor.
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*/
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struct zfs_devdesc {
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struct devdesc dd; /* Must be first. */
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uint64_t pool_guid;
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uint64_t root_guid;
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};
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/* nvp implementation version */
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#define NV_VERSION 0
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/* nvlist persistent unique name flags, stored in nvl_nvflags */
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#define NV_UNIQUE_NAME 0x1
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#define NV_UNIQUE_NAME_TYPE 0x2
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#define NV_ALIGN4(x) (((x) + 3) & ~3)
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/*
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* nvlist header.
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* nvlist has 4 bytes header followed by version and flags, then nvpairs
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* and the list is terminated by double zero.
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*/
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typedef struct {
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char nvh_encoding;
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char nvh_endian;
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char nvh_reserved1;
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char nvh_reserved2;
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} nvs_header_t;
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typedef struct {
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nvs_header_t nv_header;
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size_t nv_asize;
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size_t nv_size;
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uint8_t *nv_data;
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uint8_t *nv_idx;
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} nvlist_t;
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/*
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* nvpair header.
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* nvpair has encoded and decoded size
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* name string (size and data)
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* data type and number of elements
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* data
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*/
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typedef struct {
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unsigned encoded_size;
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unsigned decoded_size;
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} nvp_header_t;
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/*
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* nvlist stream head.
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*/
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typedef struct {
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unsigned nvl_version;
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unsigned nvl_nvflag;
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nvp_header_t nvl_pair;
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} nvs_data_t;
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typedef struct {
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unsigned nv_size;
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uint8_t nv_data[]; /* NV_ALIGN4(string) */
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} nv_string_t;
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typedef struct {
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unsigned nv_type; /* data_type_t */
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unsigned nv_nelem; /* number of elements */
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uint8_t nv_data[]; /* data stream */
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} nv_pair_data_t;
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nvlist_t *nvlist_create(int);
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void nvlist_destroy(nvlist_t *);
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nvlist_t *nvlist_import(const uint8_t *, char, char);
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int nvlist_remove(nvlist_t *, const char *, data_type_t);
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void nvlist_print(nvlist_t *, unsigned int);
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int nvlist_find(const nvlist_t *, const char *, data_type_t,
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int *, void *, int *);
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int nvlist_next(nvlist_t *);
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int zfs_parsedev(struct zfs_devdesc *dev, const char *devspec,
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const char **path);
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char *zfs_fmtdev(void *vdev);
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int zfs_nextboot(void *vdev, char *buf, size_t size);
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int zfs_probe_dev(const char *devname, uint64_t *pool_guid);
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int zfs_list(const char *name);
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uint64_t ldi_get_size(void *);
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void init_zfs_boot_options(const char *currdev);
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int zfs_bootenv(const char *name);
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int zfs_belist_add(const char *name, uint64_t __unused);
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int zfs_set_env(void);
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extern struct devsw zfs_dev;
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extern struct fs_ops zfs_fsops;
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#endif /*_BOOT_LIBZFS_H_*/
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