/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see .
***/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#if HAVE_LINUX_BTRFS_H
#include
#endif
#include "alloc-util.h"
#include "btrfs-ctree.h"
#include "btrfs-util.h"
#include "chattr-util.h"
#include "copy.h"
#include "fd-util.h"
#include "fileio.h"
#include "io-util.h"
#include "macro.h"
#include "missing.h"
#include "path-util.h"
#include "rm-rf.h"
#include "selinux-util.h"
#include "smack-util.h"
#include "sparse-endian.h"
#include "stat-util.h"
#include "string-util.h"
#include "time-util.h"
#include "util.h"
/* WARNING: Be careful with file system ioctls! When we get an fd, we
* need to make sure it either refers to only a regular file or
* directory, or that it is located on btrfs, before invoking any
* btrfs ioctls. The ioctl numbers are reused by some device drivers
* (such as DRM), and hence might have bad effects when invoked on
* device nodes (that reference drivers) rather than fds to normal
* files or directories. */
static int validate_subvolume_name(const char *name) {
if (!filename_is_valid(name))
return -EINVAL;
if (strlen(name) > BTRFS_SUBVOL_NAME_MAX)
return -E2BIG;
return 0;
}
static int open_parent(const char *path, int flags) {
_cleanup_free_ char *parent = NULL;
int fd;
assert(path);
parent = dirname_malloc(path);
if (!parent)
return -ENOMEM;
fd = open(parent, flags);
if (fd < 0)
return -errno;
return fd;
}
static int extract_subvolume_name(const char *path, const char **subvolume) {
const char *fn;
int r;
assert(path);
assert(subvolume);
fn = basename(path);
r = validate_subvolume_name(fn);
if (r < 0)
return r;
*subvolume = fn;
return 0;
}
int btrfs_is_filesystem(int fd) {
struct statfs sfs;
assert(fd >= 0);
if (fstatfs(fd, &sfs) < 0)
return -errno;
return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC);
}
int btrfs_is_subvol_fd(int fd) {
struct stat st;
assert(fd >= 0);
/* On btrfs subvolumes always have the inode 256 */
if (fstat(fd, &st) < 0)
return -errno;
if (!S_ISDIR(st.st_mode) || st.st_ino != 256)
return 0;
return btrfs_is_filesystem(fd);
}
int btrfs_is_subvol(const char *path) {
_cleanup_close_ int fd = -1;
assert(path);
fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
return -errno;
return btrfs_is_subvol_fd(fd);
}
int btrfs_subvol_make(const char *path) {
struct btrfs_ioctl_vol_args args = {};
_cleanup_close_ int fd = -1;
const char *subvolume;
int r;
assert(path);
r = extract_subvolume_name(path, &subvolume);
if (r < 0)
return r;
fd = open_parent(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
return fd;
strncpy(args.name, subvolume, sizeof(args.name)-1);
if (ioctl(fd, BTRFS_IOC_SUBVOL_CREATE, &args) < 0)
return -errno;
return 0;
}
int btrfs_subvol_make_label(const char *path) {
int r;
assert(path);
r = mac_selinux_create_file_prepare(path, S_IFDIR);
if (r < 0)
return r;
r = btrfs_subvol_make(path);
mac_selinux_create_file_clear();
if (r < 0)
return r;
return mac_smack_fix(path, false, false);
}
int btrfs_subvol_set_read_only_fd(int fd, bool b) {
uint64_t flags, nflags;
struct stat st;
assert(fd >= 0);
if (fstat(fd, &st) < 0)
return -errno;
if (!S_ISDIR(st.st_mode) || st.st_ino != 256)
return -EINVAL;
if (ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags) < 0)
return -errno;
if (b)
nflags = flags | BTRFS_SUBVOL_RDONLY;
else
nflags = flags & ~BTRFS_SUBVOL_RDONLY;
if (flags == nflags)
return 0;
if (ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &nflags) < 0)
return -errno;
return 0;
}
int btrfs_subvol_set_read_only(const char *path, bool b) {
_cleanup_close_ int fd = -1;
fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
return -errno;
return btrfs_subvol_set_read_only_fd(fd, b);
}
int btrfs_subvol_get_read_only_fd(int fd) {
uint64_t flags;
struct stat st;
assert(fd >= 0);
if (fstat(fd, &st) < 0)
return -errno;
if (!S_ISDIR(st.st_mode) || st.st_ino != 256)
return -EINVAL;
if (ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags) < 0)
return -errno;
return !!(flags & BTRFS_SUBVOL_RDONLY);
}
int btrfs_reflink(int infd, int outfd) {
struct stat st;
int r;
assert(infd >= 0);
assert(outfd >= 0);
/* Make sure we invoke the ioctl on a regular file, so that no
* device driver accidentally gets it. */
if (fstat(outfd, &st) < 0)
return -errno;
if (!S_ISREG(st.st_mode))
return -EINVAL;
r = ioctl(outfd, BTRFS_IOC_CLONE, infd);
if (r < 0)
return -errno;
return 0;
}
int btrfs_clone_range(int infd, uint64_t in_offset, int outfd, uint64_t out_offset, uint64_t sz) {
struct btrfs_ioctl_clone_range_args args = {
.src_fd = infd,
.src_offset = in_offset,
.src_length = sz,
.dest_offset = out_offset,
};
struct stat st;
int r;
assert(infd >= 0);
assert(outfd >= 0);
assert(sz > 0);
if (fstat(outfd, &st) < 0)
return -errno;
if (!S_ISREG(st.st_mode))
return -EINVAL;
r = ioctl(outfd, BTRFS_IOC_CLONE_RANGE, &args);
if (r < 0)
return -errno;
return 0;
}
int btrfs_get_block_device_fd(int fd, dev_t *dev) {
struct btrfs_ioctl_fs_info_args fsi = {};
uint64_t id;
int r;
assert(fd >= 0);
assert(dev);
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0)
return -errno;
/* We won't do this for btrfs RAID */
if (fsi.num_devices != 1)
return 0;
for (id = 1; id <= fsi.max_id; id++) {
struct btrfs_ioctl_dev_info_args di = {
.devid = id,
};
struct stat st;
if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) {
if (errno == ENODEV)
continue;
return -errno;
}
if (stat((char*) di.path, &st) < 0)
return -errno;
if (!S_ISBLK(st.st_mode))
return -ENODEV;
if (major(st.st_rdev) == 0)
return -ENODEV;
*dev = st.st_rdev;
return 1;
}
return -ENODEV;
}
int btrfs_get_block_device(const char *path, dev_t *dev) {
_cleanup_close_ int fd = -1;
assert(path);
assert(dev);
fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0)
return -errno;
return btrfs_get_block_device_fd(fd, dev);
}
int btrfs_subvol_get_id_fd(int fd, uint64_t *ret) {
struct btrfs_ioctl_ino_lookup_args args = {
.objectid = BTRFS_FIRST_FREE_OBJECTID
};
int r;
assert(fd >= 0);
assert(ret);
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
if (ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args) < 0)
return -errno;
*ret = args.treeid;
return 0;
}
int btrfs_subvol_get_id(int fd, const char *subvol, uint64_t *ret) {
_cleanup_close_ int subvol_fd = -1;
assert(fd >= 0);
assert(ret);
subvol_fd = openat(fd, subvol, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (subvol_fd < 0)
return -errno;
return btrfs_subvol_get_id_fd(subvol_fd, ret);
}
static bool btrfs_ioctl_search_args_inc(struct btrfs_ioctl_search_args *args) {
assert(args);
/* the objectid, type, offset together make up the btrfs key,
* which is considered a single 136byte integer when
* comparing. This call increases the counter by one, dealing
* with the overflow between the overflows */
if (args->key.min_offset < (uint64_t) -1) {
args->key.min_offset++;
return true;
}
if (args->key.min_type < (uint8_t) -1) {
args->key.min_type++;
args->key.min_offset = 0;
return true;
}
if (args->key.min_objectid < (uint64_t) -1) {
args->key.min_objectid++;
args->key.min_offset = 0;
args->key.min_type = 0;
return true;
}
return 0;
}
static void btrfs_ioctl_search_args_set(struct btrfs_ioctl_search_args *args, const struct btrfs_ioctl_search_header *h) {
assert(args);
assert(h);
args->key.min_objectid = h->objectid;
args->key.min_type = h->type;
args->key.min_offset = h->offset;
}
static int btrfs_ioctl_search_args_compare(const struct btrfs_ioctl_search_args *args) {
assert(args);
/* Compare min and max */
if (args->key.min_objectid < args->key.max_objectid)
return -1;
if (args->key.min_objectid > args->key.max_objectid)
return 1;
if (args->key.min_type < args->key.max_type)
return -1;
if (args->key.min_type > args->key.max_type)
return 1;
if (args->key.min_offset < args->key.max_offset)
return -1;
if (args->key.min_offset > args->key.max_offset)
return 1;
return 0;
}
#define FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) \
for ((i) = 0, \
(sh) = (const struct btrfs_ioctl_search_header*) (args).buf; \
(i) < (args).key.nr_items; \
(i)++, \
(sh) = (const struct btrfs_ioctl_search_header*) ((uint8_t*) (sh) + sizeof(struct btrfs_ioctl_search_header) + (sh)->len))
#define BTRFS_IOCTL_SEARCH_HEADER_BODY(sh) \
((void*) ((uint8_t*) sh + sizeof(struct btrfs_ioctl_search_header)))
int btrfs_subvol_get_info_fd(int fd, uint64_t subvol_id, BtrfsSubvolInfo *ret) {
struct btrfs_ioctl_search_args args = {
/* Tree of tree roots */
.key.tree_id = BTRFS_ROOT_TREE_OBJECTID,
/* Look precisely for the subvolume items */
.key.min_type = BTRFS_ROOT_ITEM_KEY,
.key.max_type = BTRFS_ROOT_ITEM_KEY,
.key.min_offset = 0,
.key.max_offset = (uint64_t) -1,
/* No restrictions on the other components */
.key.min_transid = 0,
.key.max_transid = (uint64_t) -1,
};
bool found = false;
int r;
assert(fd >= 0);
assert(ret);
if (subvol_id == 0) {
r = btrfs_subvol_get_id_fd(fd, &subvol_id);
if (r < 0)
return r;
} else {
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
}
args.key.min_objectid = args.key.max_objectid = subvol_id;
while (btrfs_ioctl_search_args_compare(&args) <= 0) {
const struct btrfs_ioctl_search_header *sh;
unsigned i;
args.key.nr_items = 256;
if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)
return -errno;
if (args.key.nr_items <= 0)
break;
FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {
const struct btrfs_root_item *ri;
/* Make sure we start the next search at least from this entry */
btrfs_ioctl_search_args_set(&args, sh);
if (sh->objectid != subvol_id)
continue;
if (sh->type != BTRFS_ROOT_ITEM_KEY)
continue;
/* Older versions of the struct lacked the otime setting */
if (sh->len < offsetof(struct btrfs_root_item, otime) + sizeof(struct btrfs_timespec))
continue;
ri = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
ret->otime = (usec_t) le64toh(ri->otime.sec) * USEC_PER_SEC +
(usec_t) le32toh(ri->otime.nsec) / NSEC_PER_USEC;
ret->subvol_id = subvol_id;
ret->read_only = !!(le64toh(ri->flags) & BTRFS_ROOT_SUBVOL_RDONLY);
assert_cc(sizeof(ri->uuid) == sizeof(ret->uuid));
memcpy(&ret->uuid, ri->uuid, sizeof(ret->uuid));
memcpy(&ret->parent_uuid, ri->parent_uuid, sizeof(ret->parent_uuid));
found = true;
goto finish;
}
/* Increase search key by one, to read the next item, if we can. */
if (!btrfs_ioctl_search_args_inc(&args))
break;
}
finish:
if (!found)
return -ENODATA;
return 0;
}
int btrfs_qgroup_get_quota_fd(int fd, uint64_t qgroupid, BtrfsQuotaInfo *ret) {
struct btrfs_ioctl_search_args args = {
/* Tree of quota items */
.key.tree_id = BTRFS_QUOTA_TREE_OBJECTID,
/* The object ID is always 0 */
.key.min_objectid = 0,
.key.max_objectid = 0,
/* Look precisely for the quota items */
.key.min_type = BTRFS_QGROUP_STATUS_KEY,
.key.max_type = BTRFS_QGROUP_LIMIT_KEY,
/* No restrictions on the other components */
.key.min_transid = 0,
.key.max_transid = (uint64_t) -1,
};
bool found_info = false, found_limit = false;
int r;
assert(fd >= 0);
assert(ret);
if (qgroupid == 0) {
r = btrfs_subvol_get_id_fd(fd, &qgroupid);
if (r < 0)
return r;
} else {
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
}
args.key.min_offset = args.key.max_offset = qgroupid;
while (btrfs_ioctl_search_args_compare(&args) <= 0) {
const struct btrfs_ioctl_search_header *sh;
unsigned i;
args.key.nr_items = 256;
if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0) {
if (errno == ENOENT) /* quota tree is missing: quota disabled */
break;
return -errno;
}
if (args.key.nr_items <= 0)
break;
FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {
/* Make sure we start the next search at least from this entry */
btrfs_ioctl_search_args_set(&args, sh);
if (sh->objectid != 0)
continue;
if (sh->offset != qgroupid)
continue;
if (sh->type == BTRFS_QGROUP_INFO_KEY) {
const struct btrfs_qgroup_info_item *qii = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
ret->referenced = le64toh(qii->rfer);
ret->exclusive = le64toh(qii->excl);
found_info = true;
} else if (sh->type == BTRFS_QGROUP_LIMIT_KEY) {
const struct btrfs_qgroup_limit_item *qli = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
if (le64toh(qli->flags) & BTRFS_QGROUP_LIMIT_MAX_RFER)
ret->referenced_max = le64toh(qli->max_rfer);
else
ret->referenced_max = (uint64_t) -1;
if (le64toh(qli->flags) & BTRFS_QGROUP_LIMIT_MAX_EXCL)
ret->exclusive_max = le64toh(qli->max_excl);
else
ret->exclusive_max = (uint64_t) -1;
found_limit = true;
}
if (found_info && found_limit)
goto finish;
}
/* Increase search key by one, to read the next item, if we can. */
if (!btrfs_ioctl_search_args_inc(&args))
break;
}
finish:
if (!found_limit && !found_info)
return -ENODATA;
if (!found_info) {
ret->referenced = (uint64_t) -1;
ret->exclusive = (uint64_t) -1;
}
if (!found_limit) {
ret->referenced_max = (uint64_t) -1;
ret->exclusive_max = (uint64_t) -1;
}
return 0;
}
int btrfs_qgroup_get_quota(const char *path, uint64_t qgroupid, BtrfsQuotaInfo *ret) {
_cleanup_close_ int fd = -1;
fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
return -errno;
return btrfs_qgroup_get_quota_fd(fd, qgroupid, ret);
}
int btrfs_subvol_find_subtree_qgroup(int fd, uint64_t subvol_id, uint64_t *ret) {
uint64_t level, lowest = (uint64_t) -1, lowest_qgroupid = 0;
_cleanup_free_ uint64_t *qgroups = NULL;
int r, n, i;
assert(fd >= 0);
assert(ret);
/* This finds the "subtree" qgroup for a specific
* subvolume. This only works for subvolumes that have been
* prepared with btrfs_subvol_auto_qgroup_fd() with
* insert_intermediary_qgroup=true (or equivalent). For others
* it will return the leaf qgroup instead. The two cases may
* be distuingished via the return value, which is 1 in case
* an appropriate "subtree" qgroup was found, and 0
* otherwise. */
if (subvol_id == 0) {
r = btrfs_subvol_get_id_fd(fd, &subvol_id);
if (r < 0)
return r;
}
r = btrfs_qgroupid_split(subvol_id, &level, NULL);
if (r < 0)
return r;
if (level != 0) /* Input must be a leaf qgroup */
return -EINVAL;
n = btrfs_qgroup_find_parents(fd, subvol_id, &qgroups);
if (n < 0)
return n;
for (i = 0; i < n; i++) {
uint64_t id;
r = btrfs_qgroupid_split(qgroups[i], &level, &id);
if (r < 0)
return r;
if (id != subvol_id)
continue;
if (lowest == (uint64_t) -1 || level < lowest) {
lowest_qgroupid = qgroups[i];
lowest = level;
}
}
if (lowest == (uint64_t) -1) {
/* No suitable higher-level qgroup found, let's return
* the leaf qgroup instead, and indicate that with the
* return value. */
*ret = subvol_id;
return 0;
}
*ret = lowest_qgroupid;
return 1;
}
int btrfs_subvol_get_subtree_quota_fd(int fd, uint64_t subvol_id, BtrfsQuotaInfo *ret) {
uint64_t qgroupid;
int r;
assert(fd >= 0);
assert(ret);
/* This determines the quota data of the qgroup with the
* lowest level, that shares the id part with the specified
* subvolume. This is useful for determining the quota data
* for entire subvolume subtrees, as long as the subtrees have
* been set up with btrfs_qgroup_subvol_auto_fd() or in a
* compatible way */
r = btrfs_subvol_find_subtree_qgroup(fd, subvol_id, &qgroupid);
if (r < 0)
return r;
return btrfs_qgroup_get_quota_fd(fd, qgroupid, ret);
}
int btrfs_subvol_get_subtree_quota(const char *path, uint64_t subvol_id, BtrfsQuotaInfo *ret) {
_cleanup_close_ int fd = -1;
fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
return -errno;
return btrfs_subvol_get_subtree_quota_fd(fd, subvol_id, ret);
}
int btrfs_defrag_fd(int fd) {
struct stat st;
assert(fd >= 0);
if (fstat(fd, &st) < 0)
return -errno;
if (!S_ISREG(st.st_mode))
return -EINVAL;
if (ioctl(fd, BTRFS_IOC_DEFRAG, NULL) < 0)
return -errno;
return 0;
}
int btrfs_defrag(const char *p) {
_cleanup_close_ int fd = -1;
fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
return -errno;
return btrfs_defrag_fd(fd);
}
int btrfs_quota_enable_fd(int fd, bool b) {
struct btrfs_ioctl_quota_ctl_args args = {
.cmd = b ? BTRFS_QUOTA_CTL_ENABLE : BTRFS_QUOTA_CTL_DISABLE,
};
int r;
assert(fd >= 0);
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
if (ioctl(fd, BTRFS_IOC_QUOTA_CTL, &args) < 0)
return -errno;
return 0;
}
int btrfs_quota_enable(const char *path, bool b) {
_cleanup_close_ int fd = -1;
fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
return -errno;
return btrfs_quota_enable_fd(fd, b);
}
int btrfs_qgroup_set_limit_fd(int fd, uint64_t qgroupid, uint64_t referenced_max) {
struct btrfs_ioctl_qgroup_limit_args args = {
.lim.max_rfer = referenced_max,
.lim.flags = BTRFS_QGROUP_LIMIT_MAX_RFER,
};
unsigned c;
int r;
assert(fd >= 0);
if (qgroupid == 0) {
r = btrfs_subvol_get_id_fd(fd, &qgroupid);
if (r < 0)
return r;
} else {
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
}
args.qgroupid = qgroupid;
for (c = 0;; c++) {
if (ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args) < 0) {
if (errno == EBUSY && c < 10) {
(void) btrfs_quota_scan_wait(fd);
continue;
}
return -errno;
}
break;
}
return 0;
}
int btrfs_qgroup_set_limit(const char *path, uint64_t qgroupid, uint64_t referenced_max) {
_cleanup_close_ int fd = -1;
fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
return -errno;
return btrfs_qgroup_set_limit_fd(fd, qgroupid, referenced_max);
}
int btrfs_subvol_set_subtree_quota_limit_fd(int fd, uint64_t subvol_id, uint64_t referenced_max) {
uint64_t qgroupid;
int r;
assert(fd >= 0);
r = btrfs_subvol_find_subtree_qgroup(fd, subvol_id, &qgroupid);
if (r < 0)
return r;
return btrfs_qgroup_set_limit_fd(fd, qgroupid, referenced_max);
}
int btrfs_subvol_set_subtree_quota_limit(const char *path, uint64_t subvol_id, uint64_t referenced_max) {
_cleanup_close_ int fd = -1;
fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
return -errno;
return btrfs_subvol_set_subtree_quota_limit_fd(fd, subvol_id, referenced_max);
}
int btrfs_resize_loopback_fd(int fd, uint64_t new_size, bool grow_only) {
struct btrfs_ioctl_vol_args args = {};
_cleanup_free_ char *p = NULL, *loop = NULL, *backing = NULL;
_cleanup_close_ int loop_fd = -1, backing_fd = -1;
struct stat st;
dev_t dev = 0;
int r;
/* In contrast to btrfs quota ioctls ftruncate() cannot make sense of "infinity" or file sizes > 2^31 */
if (!FILE_SIZE_VALID(new_size))
return -EINVAL;
/* btrfs cannot handle file systems < 16M, hence use this as minimum */
if (new_size < 16*1024*1024)
new_size = 16*1024*1024;
r = btrfs_get_block_device_fd(fd, &dev);
if (r < 0)
return r;
if (r == 0)
return -ENODEV;
if (asprintf(&p, "/sys/dev/block/%u:%u/loop/backing_file", major(dev), minor(dev)) < 0)
return -ENOMEM;
r = read_one_line_file(p, &backing);
if (r == -ENOENT)
return -ENODEV;
if (r < 0)
return r;
if (isempty(backing) || !path_is_absolute(backing))
return -ENODEV;
backing_fd = open(backing, O_RDWR|O_CLOEXEC|O_NOCTTY);
if (backing_fd < 0)
return -errno;
if (fstat(backing_fd, &st) < 0)
return -errno;
if (!S_ISREG(st.st_mode))
return -ENODEV;
if (new_size == (uint64_t) st.st_size)
return 0;
if (grow_only && new_size < (uint64_t) st.st_size)
return -EINVAL;
if (asprintf(&loop, "/dev/block/%u:%u", major(dev), minor(dev)) < 0)
return -ENOMEM;
loop_fd = open(loop, O_RDWR|O_CLOEXEC|O_NOCTTY);
if (loop_fd < 0)
return -errno;
if (snprintf(args.name, sizeof(args.name), "%" PRIu64, new_size) >= (int) sizeof(args.name))
return -EINVAL;
if (new_size < (uint64_t) st.st_size) {
/* Decrease size: first decrease btrfs size, then shorten loopback */
if (ioctl(fd, BTRFS_IOC_RESIZE, &args) < 0)
return -errno;
}
if (ftruncate(backing_fd, new_size) < 0)
return -errno;
if (ioctl(loop_fd, LOOP_SET_CAPACITY, 0) < 0)
return -errno;
if (new_size > (uint64_t) st.st_size) {
/* Increase size: first enlarge loopback, then increase btrfs size */
if (ioctl(fd, BTRFS_IOC_RESIZE, &args) < 0)
return -errno;
}
/* Make sure the free disk space is correctly updated for both file systems */
(void) fsync(fd);
(void) fsync(backing_fd);
return 1;
}
int btrfs_resize_loopback(const char *p, uint64_t new_size, bool grow_only) {
_cleanup_close_ int fd = -1;
fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0)
return -errno;
return btrfs_resize_loopback_fd(fd, new_size, grow_only);
}
int btrfs_qgroupid_make(uint64_t level, uint64_t id, uint64_t *ret) {
assert(ret);
if (level >= (UINT64_C(1) << (64 - BTRFS_QGROUP_LEVEL_SHIFT)))
return -EINVAL;
if (id >= (UINT64_C(1) << BTRFS_QGROUP_LEVEL_SHIFT))
return -EINVAL;
*ret = (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
return 0;
}
int btrfs_qgroupid_split(uint64_t qgroupid, uint64_t *level, uint64_t *id) {
assert(level || id);
if (level)
*level = qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
if (id)
*id = qgroupid & ((UINT64_C(1) << BTRFS_QGROUP_LEVEL_SHIFT) - 1);
return 0;
}
static int qgroup_create_or_destroy(int fd, bool b, uint64_t qgroupid) {
struct btrfs_ioctl_qgroup_create_args args = {
.create = b,
.qgroupid = qgroupid,
};
unsigned c;
int r;
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (r == 0)
return -ENOTTY;
for (c = 0;; c++) {
if (ioctl(fd, BTRFS_IOC_QGROUP_CREATE, &args) < 0) {
/* If quota is not enabled, we get EINVAL. Turn this into a recognizable error */
if (errno == EINVAL)
return -ENOPROTOOPT;
if (errno == EBUSY && c < 10) {
(void) btrfs_quota_scan_wait(fd);
continue;
}
return -errno;
}
break;
}
return 0;
}
int btrfs_qgroup_create(int fd, uint64_t qgroupid) {
return qgroup_create_or_destroy(fd, true, qgroupid);
}
int btrfs_qgroup_destroy(int fd, uint64_t qgroupid) {
return qgroup_create_or_destroy(fd, false, qgroupid);
}
int btrfs_qgroup_destroy_recursive(int fd, uint64_t qgroupid) {
_cleanup_free_ uint64_t *qgroups = NULL;
uint64_t subvol_id;
int i, n, r;
/* Destroys the specified qgroup, but unassigns it from all
* its parents first. Also, it recursively destroys all
* qgroups it is assgined to that have the same id part of the
* qgroupid as the specified group. */
r = btrfs_qgroupid_split(qgroupid, NULL, &subvol_id);
if (r < 0)
return r;
n = btrfs_qgroup_find_parents(fd, qgroupid, &qgroups);
if (n < 0)
return n;
for (i = 0; i < n; i++) {
uint64_t id;
r = btrfs_qgroupid_split(qgroups[i], NULL, &id);
if (r < 0)
return r;
r = btrfs_qgroup_unassign(fd, qgroupid, qgroups[i]);
if (r < 0)
return r;
if (id != subvol_id)
continue;
/* The parent qgroupid shares the same id part with
* us? If so, destroy it too. */
(void) btrfs_qgroup_destroy_recursive(fd, qgroups[i]);
}
return btrfs_qgroup_destroy(fd, qgroupid);
}
int btrfs_quota_scan_start(int fd) {
struct btrfs_ioctl_quota_rescan_args args = {};
assert(fd >= 0);
if (ioctl(fd, BTRFS_IOC_QUOTA_RESCAN, &args) < 0)
return -errno;
return 0;
}
int btrfs_quota_scan_wait(int fd) {
assert(fd >= 0);
if (ioctl(fd, BTRFS_IOC_QUOTA_RESCAN_WAIT) < 0)
return -errno;
return 0;
}
int btrfs_quota_scan_ongoing(int fd) {
struct btrfs_ioctl_quota_rescan_args args = {};
assert(fd >= 0);
if (ioctl(fd, BTRFS_IOC_QUOTA_RESCAN_STATUS, &args) < 0)
return -errno;
return !!args.flags;
}
static int qgroup_assign_or_unassign(int fd, bool b, uint64_t child, uint64_t parent) {
struct btrfs_ioctl_qgroup_assign_args args = {
.assign = b,
.src = child,
.dst = parent,
};
unsigned c;
int r;
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (r == 0)
return -ENOTTY;
for (c = 0;; c++) {
r = ioctl(fd, BTRFS_IOC_QGROUP_ASSIGN, &args);
if (r < 0) {
if (errno == EBUSY && c < 10) {
(void) btrfs_quota_scan_wait(fd);
continue;
}
return -errno;
}
if (r == 0)
return 0;
/* If the return value is > 0, we need to request a rescan */
(void) btrfs_quota_scan_start(fd);
return 1;
}
}
int btrfs_qgroup_assign(int fd, uint64_t child, uint64_t parent) {
return qgroup_assign_or_unassign(fd, true, child, parent);
}
int btrfs_qgroup_unassign(int fd, uint64_t child, uint64_t parent) {
return qgroup_assign_or_unassign(fd, false, child, parent);
}
static int subvol_remove_children(int fd, const char *subvolume, uint64_t subvol_id, BtrfsRemoveFlags flags) {
struct btrfs_ioctl_search_args args = {
.key.tree_id = BTRFS_ROOT_TREE_OBJECTID,
.key.min_objectid = BTRFS_FIRST_FREE_OBJECTID,
.key.max_objectid = BTRFS_LAST_FREE_OBJECTID,
.key.min_type = BTRFS_ROOT_BACKREF_KEY,
.key.max_type = BTRFS_ROOT_BACKREF_KEY,
.key.min_transid = 0,
.key.max_transid = (uint64_t) -1,
};
struct btrfs_ioctl_vol_args vol_args = {};
_cleanup_close_ int subvol_fd = -1;
struct stat st;
bool made_writable = false;
int r;
assert(fd >= 0);
assert(subvolume);
if (fstat(fd, &st) < 0)
return -errno;
if (!S_ISDIR(st.st_mode))
return -EINVAL;
subvol_fd = openat(fd, subvolume, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (subvol_fd < 0)
return -errno;
if (subvol_id == 0) {
r = btrfs_subvol_get_id_fd(subvol_fd, &subvol_id);
if (r < 0)
return r;
}
/* First, try to remove the subvolume. If it happens to be
* already empty, this will just work. */
strncpy(vol_args.name, subvolume, sizeof(vol_args.name)-1);
if (ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &vol_args) >= 0) {
(void) btrfs_qgroup_destroy_recursive(fd, subvol_id); /* for the leaf subvolumes, the qgroup id is identical to the subvol id */
return 0;
}
if (!(flags & BTRFS_REMOVE_RECURSIVE) || errno != ENOTEMPTY)
return -errno;
/* OK, the subvolume is not empty, let's look for child
* subvolumes, and remove them, first */
args.key.min_offset = args.key.max_offset = subvol_id;
while (btrfs_ioctl_search_args_compare(&args) <= 0) {
const struct btrfs_ioctl_search_header *sh;
unsigned i;
args.key.nr_items = 256;
if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)
return -errno;
if (args.key.nr_items <= 0)
break;
FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {
_cleanup_free_ char *p = NULL;
const struct btrfs_root_ref *ref;
struct btrfs_ioctl_ino_lookup_args ino_args;
btrfs_ioctl_search_args_set(&args, sh);
if (sh->type != BTRFS_ROOT_BACKREF_KEY)
continue;
if (sh->offset != subvol_id)
continue;
ref = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
p = strndup((char*) ref + sizeof(struct btrfs_root_ref), le64toh(ref->name_len));
if (!p)
return -ENOMEM;
zero(ino_args);
ino_args.treeid = subvol_id;
ino_args.objectid = htole64(ref->dirid);
if (ioctl(fd, BTRFS_IOC_INO_LOOKUP, &ino_args) < 0)
return -errno;
if (!made_writable) {
r = btrfs_subvol_set_read_only_fd(subvol_fd, false);
if (r < 0)
return r;
made_writable = true;
}
if (isempty(ino_args.name))
/* Subvolume is in the top-level
* directory of the subvolume. */
r = subvol_remove_children(subvol_fd, p, sh->objectid, flags);
else {
_cleanup_close_ int child_fd = -1;
/* Subvolume is somewhere further down,
* hence we need to open the
* containing directory first */
child_fd = openat(subvol_fd, ino_args.name, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (child_fd < 0)
return -errno;
r = subvol_remove_children(child_fd, p, sh->objectid, flags);
}
if (r < 0)
return r;
}
/* Increase search key by one, to read the next item, if we can. */
if (!btrfs_ioctl_search_args_inc(&args))
break;
}
/* OK, the child subvolumes should all be gone now, let's try
* again to remove the subvolume */
if (ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &vol_args) < 0)
return -errno;
(void) btrfs_qgroup_destroy_recursive(fd, subvol_id);
return 0;
}
int btrfs_subvol_remove(const char *path, BtrfsRemoveFlags flags) {
_cleanup_close_ int fd = -1;
const char *subvolume;
int r;
assert(path);
r = extract_subvolume_name(path, &subvolume);
if (r < 0)
return r;
fd = open_parent(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
return fd;
return subvol_remove_children(fd, subvolume, 0, flags);
}
int btrfs_subvol_remove_fd(int fd, const char *subvolume, BtrfsRemoveFlags flags) {
return subvol_remove_children(fd, subvolume, 0, flags);
}
int btrfs_qgroup_copy_limits(int fd, uint64_t old_qgroupid, uint64_t new_qgroupid) {
struct btrfs_ioctl_search_args args = {
/* Tree of quota items */
.key.tree_id = BTRFS_QUOTA_TREE_OBJECTID,
/* The object ID is always 0 */
.key.min_objectid = 0,
.key.max_objectid = 0,
/* Look precisely for the quota items */
.key.min_type = BTRFS_QGROUP_LIMIT_KEY,
.key.max_type = BTRFS_QGROUP_LIMIT_KEY,
/* For our qgroup */
.key.min_offset = old_qgroupid,
.key.max_offset = old_qgroupid,
/* No restrictions on the other components */
.key.min_transid = 0,
.key.max_transid = (uint64_t) -1,
};
int r;
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
while (btrfs_ioctl_search_args_compare(&args) <= 0) {
const struct btrfs_ioctl_search_header *sh;
unsigned i;
args.key.nr_items = 256;
if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0) {
if (errno == ENOENT) /* quota tree missing: quota is not enabled, hence nothing to copy */
break;
return -errno;
}
if (args.key.nr_items <= 0)
break;
FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {
const struct btrfs_qgroup_limit_item *qli = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
struct btrfs_ioctl_qgroup_limit_args qargs;
unsigned c;
/* Make sure we start the next search at least from this entry */
btrfs_ioctl_search_args_set(&args, sh);
if (sh->objectid != 0)
continue;
if (sh->type != BTRFS_QGROUP_LIMIT_KEY)
continue;
if (sh->offset != old_qgroupid)
continue;
/* We found the entry, now copy things over. */
qargs = (struct btrfs_ioctl_qgroup_limit_args) {
.qgroupid = new_qgroupid,
.lim.max_rfer = le64toh(qli->max_rfer),
.lim.max_excl = le64toh(qli->max_excl),
.lim.rsv_rfer = le64toh(qli->rsv_rfer),
.lim.rsv_excl = le64toh(qli->rsv_excl),
.lim.flags = le64toh(qli->flags) & (BTRFS_QGROUP_LIMIT_MAX_RFER|
BTRFS_QGROUP_LIMIT_MAX_EXCL|
BTRFS_QGROUP_LIMIT_RSV_RFER|
BTRFS_QGROUP_LIMIT_RSV_EXCL),
};
for (c = 0;; c++) {
if (ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &qargs) < 0) {
if (errno == EBUSY && c < 10) {
(void) btrfs_quota_scan_wait(fd);
continue;
}
return -errno;
}
break;
}
return 1;
}
/* Increase search key by one, to read the next item, if we can. */
if (!btrfs_ioctl_search_args_inc(&args))
break;
}
return 0;
}
static int copy_quota_hierarchy(int fd, uint64_t old_subvol_id, uint64_t new_subvol_id) {
_cleanup_free_ uint64_t *old_qgroups = NULL, *old_parent_qgroups = NULL;
bool copy_from_parent = false, insert_intermediary_qgroup = false;
int n_old_qgroups, n_old_parent_qgroups, r, i;
uint64_t old_parent_id;
assert(fd >= 0);
/* Copies a reduced form of quota information from the old to
* the new subvolume. */
n_old_qgroups = btrfs_qgroup_find_parents(fd, old_subvol_id, &old_qgroups);
if (n_old_qgroups <= 0) /* Nothing to copy */
return n_old_qgroups;
r = btrfs_subvol_get_parent(fd, old_subvol_id, &old_parent_id);
if (r == -ENXIO)
/* We have no parent, hence nothing to copy. */
n_old_parent_qgroups = 0;
else if (r < 0)
return r;
else {
n_old_parent_qgroups = btrfs_qgroup_find_parents(fd, old_parent_id, &old_parent_qgroups);
if (n_old_parent_qgroups < 0)
return n_old_parent_qgroups;
}
for (i = 0; i < n_old_qgroups; i++) {
uint64_t id;
int j;
r = btrfs_qgroupid_split(old_qgroups[i], NULL, &id);
if (r < 0)
return r;
if (id == old_subvol_id) {
/* The old subvolume was member of a qgroup
* that had the same id, but a different level
* as it self. Let's set up something similar
* in the destination. */
insert_intermediary_qgroup = true;
break;
}
for (j = 0; j < n_old_parent_qgroups; j++)
if (old_parent_qgroups[j] == old_qgroups[i]) {
/* The old subvolume shared a common
* parent qgroup with its parent
* subvolume. Let's set up something
* similar in the destination. */
copy_from_parent = true;
}
}
if (!insert_intermediary_qgroup && !copy_from_parent)
return 0;
return btrfs_subvol_auto_qgroup_fd(fd, new_subvol_id, insert_intermediary_qgroup);
}
static int copy_subtree_quota_limits(int fd, uint64_t old_subvol, uint64_t new_subvol) {
uint64_t old_subtree_qgroup, new_subtree_qgroup;
bool changed;
int r;
/* First copy the leaf limits */
r = btrfs_qgroup_copy_limits(fd, old_subvol, new_subvol);
if (r < 0)
return r;
changed = r > 0;
/* Then, try to copy the subtree limits, if there are any. */
r = btrfs_subvol_find_subtree_qgroup(fd, old_subvol, &old_subtree_qgroup);
if (r < 0)
return r;
if (r == 0)
return changed;
r = btrfs_subvol_find_subtree_qgroup(fd, new_subvol, &new_subtree_qgroup);
if (r < 0)
return r;
if (r == 0)
return changed;
r = btrfs_qgroup_copy_limits(fd, old_subtree_qgroup, new_subtree_qgroup);
if (r != 0)
return r;
return changed;
}
static int subvol_snapshot_children(int old_fd, int new_fd, const char *subvolume, uint64_t old_subvol_id, BtrfsSnapshotFlags flags) {
struct btrfs_ioctl_search_args args = {
.key.tree_id = BTRFS_ROOT_TREE_OBJECTID,
.key.min_objectid = BTRFS_FIRST_FREE_OBJECTID,
.key.max_objectid = BTRFS_LAST_FREE_OBJECTID,
.key.min_type = BTRFS_ROOT_BACKREF_KEY,
.key.max_type = BTRFS_ROOT_BACKREF_KEY,
.key.min_transid = 0,
.key.max_transid = (uint64_t) -1,
};
struct btrfs_ioctl_vol_args_v2 vol_args = {
.flags = flags & BTRFS_SNAPSHOT_READ_ONLY ? BTRFS_SUBVOL_RDONLY : 0,
.fd = old_fd,
};
_cleanup_close_ int subvolume_fd = -1;
uint64_t new_subvol_id;
int r;
assert(old_fd >= 0);
assert(new_fd >= 0);
assert(subvolume);
strncpy(vol_args.name, subvolume, sizeof(vol_args.name)-1);
if (ioctl(new_fd, BTRFS_IOC_SNAP_CREATE_V2, &vol_args) < 0)
return -errno;
if (!(flags & BTRFS_SNAPSHOT_RECURSIVE) &&
!(flags & BTRFS_SNAPSHOT_QUOTA))
return 0;
if (old_subvol_id == 0) {
r = btrfs_subvol_get_id_fd(old_fd, &old_subvol_id);
if (r < 0)
return r;
}
r = btrfs_subvol_get_id(new_fd, vol_args.name, &new_subvol_id);
if (r < 0)
return r;
if (flags & BTRFS_SNAPSHOT_QUOTA)
(void) copy_quota_hierarchy(new_fd, old_subvol_id, new_subvol_id);
if (!(flags & BTRFS_SNAPSHOT_RECURSIVE)) {
if (flags & BTRFS_SNAPSHOT_QUOTA)
(void) copy_subtree_quota_limits(new_fd, old_subvol_id, new_subvol_id);
return 0;
}
args.key.min_offset = args.key.max_offset = old_subvol_id;
while (btrfs_ioctl_search_args_compare(&args) <= 0) {
const struct btrfs_ioctl_search_header *sh;
unsigned i;
args.key.nr_items = 256;
if (ioctl(old_fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)
return -errno;
if (args.key.nr_items <= 0)
break;
FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {
_cleanup_free_ char *p = NULL, *c = NULL, *np = NULL;
struct btrfs_ioctl_ino_lookup_args ino_args;
const struct btrfs_root_ref *ref;
_cleanup_close_ int old_child_fd = -1, new_child_fd = -1;
btrfs_ioctl_search_args_set(&args, sh);
if (sh->type != BTRFS_ROOT_BACKREF_KEY)
continue;
/* Avoid finding the source subvolume a second
* time */
if (sh->offset != old_subvol_id)
continue;
/* Avoid running into loops if the new
* subvolume is below the old one. */
if (sh->objectid == new_subvol_id)
continue;
ref = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
p = strndup((char*) ref + sizeof(struct btrfs_root_ref), le64toh(ref->name_len));
if (!p)
return -ENOMEM;
zero(ino_args);
ino_args.treeid = old_subvol_id;
ino_args.objectid = htole64(ref->dirid);
if (ioctl(old_fd, BTRFS_IOC_INO_LOOKUP, &ino_args) < 0)
return -errno;
/* The kernel returns an empty name if the
* subvolume is in the top-level directory,
* and otherwise appends a slash, so that we
* can just concatenate easily here, without
* adding a slash. */
c = strappend(ino_args.name, p);
if (!c)
return -ENOMEM;
old_child_fd = openat(old_fd, c, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (old_child_fd < 0)
return -errno;
np = strjoin(subvolume, "/", ino_args.name);
if (!np)
return -ENOMEM;
new_child_fd = openat(new_fd, np, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (new_child_fd < 0)
return -errno;
if (flags & BTRFS_SNAPSHOT_READ_ONLY) {
/* If the snapshot is read-only we
* need to mark it writable
* temporarily, to put the subsnapshot
* into place. */
if (subvolume_fd < 0) {
subvolume_fd = openat(new_fd, subvolume, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (subvolume_fd < 0)
return -errno;
}
r = btrfs_subvol_set_read_only_fd(subvolume_fd, false);
if (r < 0)
return r;
}
/* When btrfs clones the subvolumes, child
* subvolumes appear as empty directories. Remove
* them, so that we can create a new snapshot
* in their place */
if (unlinkat(new_child_fd, p, AT_REMOVEDIR) < 0) {
int k = -errno;
if (flags & BTRFS_SNAPSHOT_READ_ONLY)
(void) btrfs_subvol_set_read_only_fd(subvolume_fd, true);
return k;
}
r = subvol_snapshot_children(old_child_fd, new_child_fd, p, sh->objectid, flags & ~BTRFS_SNAPSHOT_FALLBACK_COPY);
/* Restore the readonly flag */
if (flags & BTRFS_SNAPSHOT_READ_ONLY) {
int k;
k = btrfs_subvol_set_read_only_fd(subvolume_fd, true);
if (r >= 0 && k < 0)
return k;
}
if (r < 0)
return r;
}
/* Increase search key by one, to read the next item, if we can. */
if (!btrfs_ioctl_search_args_inc(&args))
break;
}
if (flags & BTRFS_SNAPSHOT_QUOTA)
(void) copy_subtree_quota_limits(new_fd, old_subvol_id, new_subvol_id);
return 0;
}
int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlags flags) {
_cleanup_close_ int new_fd = -1;
const char *subvolume;
int r;
assert(old_fd >= 0);
assert(new_path);
r = btrfs_is_subvol_fd(old_fd);
if (r < 0)
return r;
if (r == 0) {
bool plain_directory = false;
/* If the source isn't a proper subvolume, fail unless fallback is requested */
if (!(flags & BTRFS_SNAPSHOT_FALLBACK_COPY))
return -EISDIR;
r = btrfs_subvol_make(new_path);
if (r == -ENOTTY && (flags & BTRFS_SNAPSHOT_FALLBACK_DIRECTORY)) {
/* If the destination doesn't support subvolumes, then use a plain directory, if that's requested. */
if (mkdir(new_path, 0755) < 0)
return r;
plain_directory = true;
} else if (r < 0)
return r;
r = copy_directory_fd(old_fd, new_path, COPY_MERGE|COPY_REFLINK);
if (r < 0)
goto fallback_fail;
if (flags & BTRFS_SNAPSHOT_READ_ONLY) {
if (plain_directory) {
/* Plain directories have no recursive read-only flag, but something pretty close to
* it: the IMMUTABLE bit. Let's use this here, if this is requested. */
if (flags & BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE)
(void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL);
} else {
r = btrfs_subvol_set_read_only(new_path, true);
if (r < 0)
goto fallback_fail;
}
}
return 0;
fallback_fail:
(void) rm_rf(new_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
return r;
}
r = extract_subvolume_name(new_path, &subvolume);
if (r < 0)
return r;
new_fd = open_parent(new_path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (new_fd < 0)
return new_fd;
return subvol_snapshot_children(old_fd, new_fd, subvolume, 0, flags);
}
int btrfs_subvol_snapshot(const char *old_path, const char *new_path, BtrfsSnapshotFlags flags) {
_cleanup_close_ int old_fd = -1;
assert(old_path);
assert(new_path);
old_fd = open(old_path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (old_fd < 0)
return -errno;
return btrfs_subvol_snapshot_fd(old_fd, new_path, flags);
}
int btrfs_qgroup_find_parents(int fd, uint64_t qgroupid, uint64_t **ret) {
struct btrfs_ioctl_search_args args = {
/* Tree of quota items */
.key.tree_id = BTRFS_QUOTA_TREE_OBJECTID,
/* Look precisely for the quota relation items */
.key.min_type = BTRFS_QGROUP_RELATION_KEY,
.key.max_type = BTRFS_QGROUP_RELATION_KEY,
/* No restrictions on the other components */
.key.min_offset = 0,
.key.max_offset = (uint64_t) -1,
.key.min_transid = 0,
.key.max_transid = (uint64_t) -1,
};
_cleanup_free_ uint64_t *items = NULL;
size_t n_items = 0, n_allocated = 0;
int r;
assert(fd >= 0);
assert(ret);
if (qgroupid == 0) {
r = btrfs_subvol_get_id_fd(fd, &qgroupid);
if (r < 0)
return r;
} else {
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
}
args.key.min_objectid = args.key.max_objectid = qgroupid;
while (btrfs_ioctl_search_args_compare(&args) <= 0) {
const struct btrfs_ioctl_search_header *sh;
unsigned i;
args.key.nr_items = 256;
if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0) {
if (errno == ENOENT) /* quota tree missing: quota is disabled */
break;
return -errno;
}
if (args.key.nr_items <= 0)
break;
FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {
/* Make sure we start the next search at least from this entry */
btrfs_ioctl_search_args_set(&args, sh);
if (sh->type != BTRFS_QGROUP_RELATION_KEY)
continue;
if (sh->offset < sh->objectid)
continue;
if (sh->objectid != qgroupid)
continue;
if (!GREEDY_REALLOC(items, n_allocated, n_items+1))
return -ENOMEM;
items[n_items++] = sh->offset;
}
/* Increase search key by one, to read the next item, if we can. */
if (!btrfs_ioctl_search_args_inc(&args))
break;
}
if (n_items <= 0) {
*ret = NULL;
return 0;
}
*ret = items;
items = NULL;
return (int) n_items;
}
int btrfs_subvol_auto_qgroup_fd(int fd, uint64_t subvol_id, bool insert_intermediary_qgroup) {
_cleanup_free_ uint64_t *qgroups = NULL;
uint64_t parent_subvol;
bool changed = false;
int n = 0, r;
assert(fd >= 0);
/*
* Sets up the specified subvolume's qgroup automatically in
* one of two ways:
*
* If insert_intermediary_qgroup is false, the subvolume's
* leaf qgroup will be assigned to the same parent qgroups as
* the subvolume's parent subvolume.
*
* If insert_intermediary_qgroup is true a new intermediary
* higher-level qgroup is created, with a higher level number,
* but reusing the id of the subvolume. The level number is
* picked as one smaller than the lowest level qgroup the
* parent subvolume is a member of. If the parent subvolume's
* leaf qgroup is assigned to no higher-level qgroup a new
* qgroup of level 255 is created instead. Either way, the new
* qgroup is then assigned to the parent's higher-level
* qgroup, and the subvolume itself is assigned to it.
*
* If the subvolume is already assigned to a higher level
* qgroup, no operation is executed.
*
* Effectively this means: regardless if
* insert_intermediary_qgroup is true or not, after this
* function is invoked the subvolume will be accounted within
* the same qgroups as the parent. However, if it is true, it
* will also get its own higher-level qgroup, which may in
* turn be used by subvolumes created beneath this subvolume
* later on.
*
* This hence defines a simple default qgroup setup for
* subvolumes, as long as this function is invoked on each
* created subvolume: each subvolume is always accounting
* together with its immediate parents. Optionally, if
* insert_intermediary_qgroup is true, it will also get a
* qgroup that then includes all its own child subvolumes.
*/
if (subvol_id == 0) {
r = btrfs_is_subvol_fd(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
r = btrfs_subvol_get_id_fd(fd, &subvol_id);
if (r < 0)
return r;
}
n = btrfs_qgroup_find_parents(fd, subvol_id, &qgroups);
if (n < 0)
return n;
if (n > 0) /* already parent qgroups set up, let's bail */
return 0;
qgroups = mfree(qgroups);
r = btrfs_subvol_get_parent(fd, subvol_id, &parent_subvol);
if (r == -ENXIO)
/* No parent, hence no qgroup memberships */
n = 0;
else if (r < 0)
return r;
else {
n = btrfs_qgroup_find_parents(fd, parent_subvol, &qgroups);
if (n < 0)
return n;
}
if (insert_intermediary_qgroup) {
uint64_t lowest = 256, new_qgroupid;
bool created = false;
int i;
/* Determine the lowest qgroup that the parent
* subvolume is assigned to. */
for (i = 0; i < n; i++) {
uint64_t level;
r = btrfs_qgroupid_split(qgroups[i], &level, NULL);
if (r < 0)
return r;
if (level < lowest)
lowest = level;
}
if (lowest <= 1) /* There are no levels left we could use insert an intermediary qgroup at */
return -EBUSY;
r = btrfs_qgroupid_make(lowest - 1, subvol_id, &new_qgroupid);
if (r < 0)
return r;
/* Create the new intermediary group, unless it already exists */
r = btrfs_qgroup_create(fd, new_qgroupid);
if (r < 0 && r != -EEXIST)
return r;
if (r >= 0)
changed = created = true;
for (i = 0; i < n; i++) {
r = btrfs_qgroup_assign(fd, new_qgroupid, qgroups[i]);
if (r < 0 && r != -EEXIST) {
if (created)
(void) btrfs_qgroup_destroy_recursive(fd, new_qgroupid);
return r;
}
if (r >= 0)
changed = true;
}
r = btrfs_qgroup_assign(fd, subvol_id, new_qgroupid);
if (r < 0 && r != -EEXIST) {
if (created)
(void) btrfs_qgroup_destroy_recursive(fd, new_qgroupid);
return r;
}
if (r >= 0)
changed = true;
} else {
int i;
/* Assign our subvolume to all the same qgroups as the parent */
for (i = 0; i < n; i++) {
r = btrfs_qgroup_assign(fd, subvol_id, qgroups[i]);
if (r < 0 && r != -EEXIST)
return r;
if (r >= 0)
changed = true;
}
}
return changed;
}
int btrfs_subvol_auto_qgroup(const char *path, uint64_t subvol_id, bool create_intermediary_qgroup) {
_cleanup_close_ int fd = -1;
fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
return -errno;
return btrfs_subvol_auto_qgroup_fd(fd, subvol_id, create_intermediary_qgroup);
}
int btrfs_subvol_get_parent(int fd, uint64_t subvol_id, uint64_t *ret) {
struct btrfs_ioctl_search_args args = {
/* Tree of tree roots */
.key.tree_id = BTRFS_ROOT_TREE_OBJECTID,
/* Look precisely for the subvolume items */
.key.min_type = BTRFS_ROOT_BACKREF_KEY,
.key.max_type = BTRFS_ROOT_BACKREF_KEY,
/* No restrictions on the other components */
.key.min_offset = 0,
.key.max_offset = (uint64_t) -1,
.key.min_transid = 0,
.key.max_transid = (uint64_t) -1,
};
int r;
assert(fd >= 0);
assert(ret);
if (subvol_id == 0) {
r = btrfs_subvol_get_id_fd(fd, &subvol_id);
if (r < 0)
return r;
} else {
r = btrfs_is_filesystem(fd);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
}
args.key.min_objectid = args.key.max_objectid = subvol_id;
while (btrfs_ioctl_search_args_compare(&args) <= 0) {
const struct btrfs_ioctl_search_header *sh;
unsigned i;
args.key.nr_items = 256;
if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)
return negative_errno();
if (args.key.nr_items <= 0)
break;
FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {
if (sh->type != BTRFS_ROOT_BACKREF_KEY)
continue;
if (sh->objectid != subvol_id)
continue;
*ret = sh->offset;
return 0;
}
}
return -ENXIO;
}