be7dd42376
be_destroy is documented to recursively destroy a boot environment. In the
case of snapshots, one would take this to mean that these are also
recursively destroyed. However, this was previously not the case.
be_destroy would descend into the be_destroy callback and attempt to
zfs_iter_children on the top-level snapshot, which is bogus.
Our alternative approach is to take note of the snapshot name and iterate
through all of fs children of the BE to try destruction in the children.
The -o option is also fixed to work properly with deep BEs. If the BE was
created with `bectl create -e otherDeepBE newDeepBE`, for instance, then a
recursive snapshot of otherDeepBE would have been taken for construction of
newDeepBE but a subsequent destroy with BE_DESTROY_ORIGIN set would only
clean up the snapshot at the root of otherDeepBE: ${BEROOT}/otherDeepBE@...
The most recent iteration instead pretends not to know how these things
work, verifies that the origin is another BE and then passes that back
through be_destroy to DTRT when snapshots and deep BEs may be in play.
MFC after: 1 week
134 lines
5.1 KiB
C
134 lines
5.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in>
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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 REGENTS 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 REGENTS 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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#ifndef _LIBBE_H
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#define _LIBBE_H
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#include <libnvpair.h>
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#include <stdbool.h>
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#define BE_MAXPATHLEN 512
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typedef struct libbe_handle libbe_handle_t;
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typedef enum be_error {
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BE_ERR_SUCCESS = 0, /* No error */
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BE_ERR_INVALIDNAME, /* invalid boot env name */
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BE_ERR_EXISTS, /* boot env name already taken */
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BE_ERR_NOENT, /* boot env doesn't exist */
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BE_ERR_PERMS, /* insufficient permissions */
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BE_ERR_DESTROYACT, /* cannot destroy active boot env */
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BE_ERR_DESTROYMNT, /* destroying a mounted be requires force */
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BE_ERR_BADPATH, /* path not suitable for operation */
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BE_ERR_PATHBUSY, /* requested path is busy */
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BE_ERR_PATHLEN, /* provided name exceeds maximum length limit */
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BE_ERR_BADMOUNT, /* mountpoint is not '/' */
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BE_ERR_NOORIGIN, /* could not open snapshot's origin */
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BE_ERR_MOUNTED, /* boot environment is already mounted */
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BE_ERR_NOMOUNT, /* boot environment is not mounted */
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BE_ERR_ZFSOPEN, /* calling zfs_open() failed */
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BE_ERR_ZFSCLONE, /* error when calling zfs_clone to create be */
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BE_ERR_IO, /* error when doing some I/O operation */
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BE_ERR_NOPOOL, /* operation not supported on this pool */
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BE_ERR_NOMEM, /* insufficient memory */
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BE_ERR_UNKNOWN, /* unknown error */
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BE_ERR_INVORIGIN, /* invalid origin */
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} be_error_t;
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/* Library handling functions: be.c */
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libbe_handle_t *libbe_init(const char *root);
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void libbe_close(libbe_handle_t *);
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/* Bootenv information functions: be_info.c */
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const char *be_active_name(libbe_handle_t *);
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const char *be_active_path(libbe_handle_t *);
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const char *be_nextboot_name(libbe_handle_t *);
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const char *be_nextboot_path(libbe_handle_t *);
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const char *be_root_path(libbe_handle_t *);
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int be_get_bootenv_props(libbe_handle_t *, nvlist_t *);
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int be_get_dataset_props(libbe_handle_t *, const char *, nvlist_t *);
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int be_get_dataset_snapshots(libbe_handle_t *, const char *, nvlist_t *);
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int be_prop_list_alloc(nvlist_t **be_list);
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void be_prop_list_free(nvlist_t *be_list);
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int be_activate(libbe_handle_t *, const char *, bool);
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/* Bootenv creation functions */
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int be_create(libbe_handle_t *, const char *);
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int be_create_from_existing(libbe_handle_t *, const char *, const char *);
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int be_create_from_existing_snap(libbe_handle_t *, const char *, const char *);
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int be_snapshot(libbe_handle_t *, const char *, const char *, bool, char *);
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/* Bootenv manipulation functions */
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int be_rename(libbe_handle_t *, const char *, const char *);
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/* Bootenv removal functions */
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typedef enum {
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BE_DESTROY_FORCE = 1 << 0,
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BE_DESTROY_ORIGIN = 1 << 1,
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} be_destroy_opt_t;
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int be_destroy(libbe_handle_t *, const char *, int);
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/* Bootenv mounting functions: be_access.c */
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typedef enum {
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BE_MNT_FORCE = 1 << 0,
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BE_MNT_DEEP = 1 << 1,
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} be_mount_opt_t;
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int be_mount(libbe_handle_t *, char *, char *, int, char *);
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int be_unmount(libbe_handle_t *, char *, int);
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int be_mounted_at(libbe_handle_t *, const char *path, nvlist_t *);
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/* Error related functions: be_error.c */
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int libbe_errno(libbe_handle_t *);
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const char *libbe_error_description(libbe_handle_t *);
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void libbe_print_on_error(libbe_handle_t *, bool);
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/* Utility Functions */
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int be_root_concat(libbe_handle_t *, const char *, char *);
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int be_validate_name(libbe_handle_t * __unused, const char *);
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int be_validate_snap(libbe_handle_t *, const char *);
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int be_exists(libbe_handle_t *, char *);
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int be_export(libbe_handle_t *, const char *, int fd);
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int be_import(libbe_handle_t *, const char *, int fd);
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#if SOON
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int be_add_child(libbe_handle_t *, const char *, bool);
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#endif
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void be_nicenum(uint64_t num, char *buf, size_t buflen);
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#endif /* _LIBBE_H */
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