90578cbd71
We already had a safety check in place that we don't end up descending to the original subvolume again, but we also should avoid descending in the newly created one. This is particularly important if we make a snapshot below its source, like we do in "systemd-nspawn --ephemeral -D /". Closes https://bugs.freedesktop.org/show_bug.cgi?id=90803
89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#pragma once
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#include <stdbool.h>
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#include <sys/types.h>
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#include "time-util.h"
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typedef struct BtrfsSubvolInfo {
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uint64_t subvol_id;
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usec_t otime;
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sd_id128_t uuid;
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sd_id128_t parent_uuid;
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bool read_only;
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} BtrfsSubvolInfo;
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typedef struct BtrfsQuotaInfo {
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uint64_t referenced;
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uint64_t exclusive;
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uint64_t referenced_max;
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uint64_t exclusive_max;
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} BtrfsQuotaInfo;
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typedef enum BtrfsSnapshotFlags {
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BTRFS_SNAPSHOT_FALLBACK_COPY = 1,
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BTRFS_SNAPSHOT_READ_ONLY = 2,
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BTRFS_SNAPSHOT_RECURSIVE = 4,
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} BtrfsSnapshotFlags;
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int btrfs_is_filesystem(int fd);
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int btrfs_is_subvol(int fd);
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int btrfs_subvol_make(const char *path);
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int btrfs_subvol_make_label(const char *path);
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int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlags flags);
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int btrfs_subvol_snapshot(const char *old_path, const char *new_path, BtrfsSnapshotFlags flags);
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int btrfs_subvol_set_read_only_fd(int fd, bool b);
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int btrfs_subvol_set_read_only(const char *path, bool b);
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int btrfs_subvol_get_read_only_fd(int fd);
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int btrfs_subvol_get_id(int fd, const char *subvolume, uint64_t *ret);
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int btrfs_subvol_get_id_fd(int fd, uint64_t *ret);
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int btrfs_subvol_get_info_fd(int fd, BtrfsSubvolInfo *info);
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int btrfs_subvol_get_quota_fd(int fd, BtrfsQuotaInfo *quota);
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int btrfs_reflink(int infd, int outfd);
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int btrfs_clone_range(int infd, uint64_t in_offset, int ofd, uint64_t out_offset, uint64_t sz);
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int btrfs_get_block_device_fd(int fd, dev_t *dev);
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int btrfs_get_block_device(const char *path, dev_t *dev);
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int btrfs_defrag_fd(int fd);
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int btrfs_defrag(const char *p);
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int btrfs_quota_enable_fd(int fd, bool b);
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int btrfs_quota_enable(const char *path, bool b);
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int btrfs_quota_limit_fd(int fd, uint64_t referenced_max);
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int btrfs_quota_limit(const char *path, uint64_t referenced_max);
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int btrfs_resize_loopback_fd(int fd, uint64_t size, bool grow_only);
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int btrfs_resize_loopback(const char *path, uint64_t size, bool grow_only);
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int btrfs_subvol_remove(const char *path, bool recursive);
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int btrfs_subvol_remove_fd(int fd, const char *subvolume, bool recursive);
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