-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- 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 <http://www.gnu.org/licenses/>.
-***/
-
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <linux/btrfs_tree.h>
+#include <linux/fs.h>
+#include <linux/loop.h>
+#include <linux/magic.h>
+#include <stddef.h>
+#include <stdio.h>
#include <stdlib.h>
-#include <sys/vfs.h>
-#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/sysmacros.h>
+#include <unistd.h>
-#ifdef HAVE_LINUX_BTRFS_H
-#include <linux/btrfs.h>
-#endif
-
-#include "missing.h"
-#include "util.h"
-#include "path-util.h"
-#include "macro.h"
+#include "alloc-util.h"
+#include "blockdev-util.h"
+#include "btrfs-util.h"
+#include "chattr-util.h"
#include "copy.h"
-#include "selinux-util.h"
-#include "smack-util.h"
+#include "fd-util.h"
#include "fileio.h"
-#include "btrfs-ctree.h"
-#include "btrfs-util.h"
+#include "fs-util.h"
+#include "io-util.h"
+#include "macro.h"
+#include "path-util.h"
+#include "rm-rf.h"
+#include "smack-util.h"
+#include "sparse-endian.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "time-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
return 0;
}
-static int open_parent(const char *path, int flags) {
- _cleanup_free_ char *parent = NULL;
- int r, fd;
-
- assert(path);
-
- r = path_get_parent(path, &parent);
- if (r < 0)
- return r;
-
- 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;
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(int fd) {
+int btrfs_is_subvol_fd(int fd) {
struct stat st;
assert(fd >= 0);
if (fstat(fd, &st) < 0)
return -errno;
- if (!S_ISDIR(st.st_mode) || st.st_ino != 256)
+ if (!btrfs_might_be_subvol(&st))
return 0;
- return btrfs_is_filesystem(fd);
+ return fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
}
-int btrfs_subvol_make(const char *path) {
+int btrfs_is_subvol(const char *path) {
+ _cleanup_close_ int fd = -EBADF;
+
+ 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_fd(int fd, const char *subvolume) {
struct btrfs_ioctl_vol_args args = {};
- _cleanup_close_ int fd = -1;
- const char *subvolume;
+ _cleanup_close_ int real_fd = -EBADF;
int r;
- assert(path);
+ assert(subvolume);
- r = extract_subvolume_name(path, &subvolume);
+ r = validate_subvolume_name(subvolume);
if (r < 0)
return r;
- fd = open_parent(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ /* If an O_PATH fd was specified, let's convert here to a proper one, as btrfs ioctl's can't deal
+ * with O_PATH. */
+ fd = fd_reopen_condition(fd, O_RDONLY|O_CLOEXEC|O_DIRECTORY, O_PATH|O_DIRECTORY, &real_fd);
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;
+ return RET_NERRNO(ioctl(fd, BTRFS_IOC_SUBVOL_CREATE, &args));
}
-int btrfs_subvol_make_label(const char *path) {
+int btrfs_subvol_make(const char *path) {
+ _cleanup_close_ int fd = -EBADF;
+ const char *subvolume;
int r;
assert(path);
- r = mac_selinux_create_file_prepare(path, S_IFDIR);
+ r = extract_subvolume_name(path, &subvolume);
if (r < 0)
return r;
+ fd = open_parent(path, O_CLOEXEC, 0);
+ if (fd < 0)
+ return fd;
+
+ return btrfs_subvol_make_fd(fd, subvolume);
+}
+
+int btrfs_subvol_make_fallback(const char *path, mode_t mode) {
+ mode_t old, combined;
+ int r;
+
+ assert(path);
+
+ /* Let's work like mkdir(), i.e. take the specified mode, and mask it with the current umask. */
+ old = umask(~mode);
+ combined = old | ~mode;
+ if (combined != ~mode)
+ umask(combined);
r = btrfs_subvol_make(path);
- mac_selinux_create_file_clear();
+ umask(old);
- if (r < 0)
+ if (r >= 0)
+ return 1; /* subvol worked */
+ if (r != -ENOTTY)
return r;
- return mac_smack_fix(path, false, false);
+ if (mkdir(path, mode) < 0)
+ return -errno;
+
+ return 0; /* plain directory */
}
int btrfs_subvol_set_read_only_fd(int fd, bool b) {
if (fstat(fd, &st) < 0)
return -errno;
- if (!S_ISDIR(st.st_mode) || st.st_ino != 256)
+ if (!btrfs_might_be_subvol(&st))
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;
-
+ nflags = UPDATE_FLAG(flags, BTRFS_SUBVOL_RDONLY, b);
if (flags == nflags)
return 0;
- if (ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &nflags) < 0)
- return -errno;
-
- return 0;
+ return RET_NERRNO(ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &nflags));
}
int btrfs_subvol_set_read_only(const char *path, bool b) {
- _cleanup_close_ int fd = -1;
+ _cleanup_close_ int fd = -EBADF;
fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
if (fstat(fd, &st) < 0)
return -errno;
- if (!S_ISDIR(st.st_mode) || st.st_ino != 256)
+ if (!btrfs_might_be_subvol(&st))
return -EINVAL;
if (ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags) < 0)
}
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;
+ /* Make sure we invoke the ioctl on a regular file, so that no device driver accidentally gets it. */
- r = ioctl(outfd, BTRFS_IOC_CLONE, infd);
+ r = fd_verify_regular(outfd);
if (r < 0)
- return -errno;
+ return r;
- return 0;
+ return RET_NERRNO(ioctl(outfd, BTRFS_IOC_CLONE, infd));
}
int btrfs_clone_range(int infd, uint64_t in_offset, int outfd, uint64_t out_offset, uint64_t sz) {
.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);
+ r = fd_verify_regular(outfd);
if (r < 0)
- return -errno;
+ return r;
- return 0;
+ return RET_NERRNO(ioctl(outfd, BTRFS_IOC_CLONE_RANGE, &args));
}
int btrfs_get_block_device_fd(int fd, dev_t *dev) {
struct btrfs_ioctl_fs_info_args fsi = {};
+ _cleanup_close_ int regfd = -EBADF;
uint64_t id;
int r;
assert(fd >= 0);
assert(dev);
- r = btrfs_is_filesystem(fd);
+ fd = fd_reopen_condition(fd, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY, O_PATH, ®fd);
+ if (fd < 0)
+ return fd;
+
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
if (r < 0)
return r;
if (!r)
return -errno;
/* We won't do this for btrfs RAID */
- if (fsi.num_devices != 1)
+ if (fsi.num_devices != 1) {
+ *dev = 0;
return 0;
+ }
for (id = 1; id <= fsi.max_id; id++) {
struct btrfs_ioctl_dev_info_args di = {
return -errno;
}
+ /* For the root fs — when no initrd is involved — btrfs returns /dev/root on any kernels from
+ * the past few years. That sucks, as we have no API to determine the actual root then. let's
+ * return an recognizable error for this case, so that the caller can maybe print a nice
+ * message about this.
+ *
+ * https://bugzilla.kernel.org/show_bug.cgi?id=89721 */
+ if (path_equal((char*) di.path, "/dev/root"))
+ return -EUCLEAN;
+
if (stat((char*) di.path, &st) < 0)
return -errno;
if (!S_ISBLK(st.st_mode))
- return -ENODEV;
+ return -ENOTBLK;
if (major(st.st_rdev) == 0)
return -ENODEV;
}
int btrfs_get_block_device(const char *path, dev_t *dev) {
- _cleanup_close_ int fd = -1;
+ _cleanup_close_ int fd = -EBADF;
assert(path);
assert(dev);
assert(fd >= 0);
assert(ret);
- r = btrfs_is_filesystem(fd);
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
if (r < 0)
return r;
if (!r)
return 0;
}
+int btrfs_subvol_get_id(int fd, const char *subvol, uint64_t *ret) {
+ _cleanup_close_ int subvol_fd = -EBADF;
+
+ 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);
* comparing. This call increases the counter by one, dealing
* with the overflow between the overflows */
- if (args->key.min_offset < (uint64_t) -1) {
+ if (args->key.min_offset < UINT64_MAX) {
args->key.min_offset++;
return true;
}
- if (args->key.min_type < (uint8_t) -1) {
+ if (args->key.min_type < UINT8_MAX) {
args->key.min_type++;
args->key.min_offset = 0;
return true;
}
- if (args->key.min_objectid < (uint64_t) -1) {
+ if (args->key.min_objectid < UINT64_MAX) {
args->key.min_objectid++;
args->key.min_offset = 0;
args->key.min_type = 0;
}
static int btrfs_ioctl_search_args_compare(const struct btrfs_ioctl_search_args *args) {
+ int r;
+
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;
+ r = CMP(args->key.min_objectid, args->key.max_objectid);
+ if (r != 0)
+ return r;
- if (args->key.min_offset < args->key.max_offset)
- return -1;
- if (args->key.min_offset > args->key.max_offset)
- return 1;
+ r = CMP(args->key.min_type, args->key.max_type);
+ if (r != 0)
+ return r;
- return 0;
+ return CMP(args->key.min_offset, args->key.max_offset);
}
#define FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) \
#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, BtrfsSubvolInfo *ret) {
+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,
.key.max_type = BTRFS_ROOT_ITEM_KEY,
.key.min_offset = 0,
- .key.max_offset = (uint64_t) -1,
+ .key.max_offset = UINT64_MAX,
/* No restrictions on the other components */
.key.min_transid = 0,
- .key.max_transid = (uint64_t) -1,
+ .key.max_transid = UINT64_MAX,
};
- uint64_t subvol_id;
bool found = false;
int r;
assert(fd >= 0);
assert(ret);
- r = btrfs_subvol_get_id_fd(fd, &subvol_id);
- if (r < 0)
- return r;
+ if (subvol_id == 0) {
+ r = btrfs_subvol_get_id_fd(fd, &subvol_id);
+ if (r < 0)
+ return r;
+ } else {
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
+ if (r < 0)
+ return r;
+ if (!r)
+ return -ENOTTY;
+ }
args.key.min_objectid = args.key.max_objectid = subvol_id;
(usec_t) le32toh(ri->otime.nsec) / NSEC_PER_USEC;
ret->subvol_id = subvol_id;
- ret->read_only = !!(le64toh(ri->flags) & BTRFS_ROOT_SUBVOL_RDONLY);
+ 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));
}
finish:
- if (!found)
- return -ENODATA;
-
- return 0;
+ return found ? 0 : -ENODATA;
}
-int btrfs_subvol_get_quota_fd(int fd, BtrfsQuotaInfo *ret) {
+int btrfs_qgroup_get_quota_fd(int fd, uint64_t qgroupid, BtrfsQuotaInfo *ret) {
struct btrfs_ioctl_search_args args = {
/* Tree of quota items */
/* No restrictions on the other components */
.key.min_transid = 0,
- .key.max_transid = (uint64_t) -1,
+ .key.max_transid = UINT64_MAX,
};
- uint64_t subvol_id;
bool found_info = false, found_limit = false;
int r;
assert(fd >= 0);
assert(ret);
- r = btrfs_subvol_get_id_fd(fd, &subvol_id);
- if (r < 0)
- return r;
+ if (qgroupid == 0) {
+ r = btrfs_subvol_get_id_fd(fd, &qgroupid);
+ if (r < 0)
+ return r;
+ } else {
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
+ if (r < 0)
+ return r;
+ if (!r)
+ return -ENOTTY;
+ }
- args.key.min_offset = args.key.max_offset = subvol_id;
+ 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 (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;
if (sh->objectid != 0)
continue;
- if (sh->offset != subvol_id)
+ if (sh->offset != qgroupid)
continue;
if (sh->type == BTRFS_QGROUP_INFO_KEY) {
} else if (sh->type == BTRFS_QGROUP_LIMIT_KEY) {
const struct btrfs_qgroup_limit_item *qli = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
- ret->referenced_max = le64toh(qli->max_rfer);
- ret->exclusive_max = le64toh(qli->max_excl);
+ if (le64toh(qli->flags) & BTRFS_QGROUP_LIMIT_MAX_RFER)
+ ret->referenced_max = le64toh(qli->max_rfer);
+ else
+ ret->referenced_max = UINT64_MAX;
- if (ret->referenced_max == 0)
- ret->referenced_max = (uint64_t) -1;
- if (ret->exclusive_max == 0)
- ret->exclusive_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_MAX;
found_limit = true;
}
return -ENODATA;
if (!found_info) {
- ret->referenced = (uint64_t) -1;
- ret->exclusive = (uint64_t) -1;
+ ret->referenced = UINT64_MAX;
+ ret->exclusive = UINT64_MAX;
}
if (!found_limit) {
- ret->referenced_max = (uint64_t) -1;
- ret->exclusive_max = (uint64_t) -1;
+ ret->referenced_max = UINT64_MAX;
+ ret->exclusive_max = UINT64_MAX;
}
return 0;
}
-int btrfs_defrag_fd(int fd) {
- struct stat st;
+int btrfs_qgroup_get_quota(const char *path, uint64_t qgroupid, BtrfsQuotaInfo *ret) {
+ _cleanup_close_ int fd = -EBADF;
+
+ 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_MAX, lowest_qgroupid = 0;
+ _cleanup_free_ uint64_t *qgroups = NULL;
+ int r, n;
assert(fd >= 0);
+ assert(ret);
- if (fstat(fd, &st) < 0)
- return -errno;
+ /* 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 distinguished 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;
+ }
- if (!S_ISREG(st.st_mode))
+ r = btrfs_qgroupid_split(subvol_id, &level, NULL);
+ if (r < 0)
+ return r;
+ if (level != 0) /* Input must be a leaf qgroup */
return -EINVAL;
- if (ioctl(fd, BTRFS_IOC_DEFRAG, NULL) < 0)
+ n = btrfs_qgroup_find_parents(fd, subvol_id, &qgroups);
+ if (n < 0)
+ return n;
+
+ for (int 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_MAX || level < lowest) {
+ lowest_qgroupid = qgroups[i];
+ lowest = level;
+ }
+ }
+
+ if (lowest == UINT64_MAX) {
+ /* 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 = -EBADF;
+
+ fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fd < 0)
return -errno;
- return 0;
+ return btrfs_subvol_get_subtree_quota_fd(fd, subvol_id, ret);
+}
+
+int btrfs_defrag_fd(int fd) {
+ int r;
+
+ assert(fd >= 0);
+
+ r = fd_verify_regular(fd);
+ if (r < 0)
+ return r;
+
+ return RET_NERRNO(ioctl(fd, BTRFS_IOC_DEFRAG, NULL));
}
int btrfs_defrag(const char *p) {
- _cleanup_close_ int fd = -1;
+ _cleanup_close_ int fd = -EBADF;
fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
assert(fd >= 0);
- r = btrfs_is_filesystem(fd);
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
if (r < 0)
return r;
if (!r)
return -ENOTTY;
- if (ioctl(fd, BTRFS_IOC_QUOTA_CTL, &args) < 0)
- return -errno;
-
- return 0;
+ return RET_NERRNO(ioctl(fd, BTRFS_IOC_QUOTA_CTL, &args));
}
int btrfs_quota_enable(const char *path, bool b) {
- _cleanup_close_ int fd = -1;
+ _cleanup_close_ int fd = -EBADF;
fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
return btrfs_quota_enable_fd(fd, b);
}
-int btrfs_quota_limit_fd(int fd, uint64_t referenced_max) {
+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 == (uint64_t) -1 ? 0 :
- referenced_max == 0 ? 1 : referenced_max,
+ .lim.max_rfer = referenced_max,
.lim.flags = BTRFS_QGROUP_LIMIT_MAX_RFER,
};
int r;
assert(fd >= 0);
- r = btrfs_is_filesystem(fd);
- if (r < 0)
- return r;
- if (!r)
- return -ENOTTY;
+ if (qgroupid == 0) {
+ r = btrfs_subvol_get_id_fd(fd, &qgroupid);
+ if (r < 0)
+ return r;
+ } else {
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
+ if (r < 0)
+ return r;
+ if (!r)
+ return -ENOTTY;
+ }
- if (ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args) < 0)
- return -errno;
+ args.qgroupid = qgroupid;
+
+ for (unsigned 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_quota_limit(const char *path, uint64_t referenced_max) {
- _cleanup_close_ int fd = -1;
+int btrfs_qgroup_set_limit(const char *path, uint64_t qgroupid, uint64_t referenced_max) {
+ _cleanup_close_ int fd = -EBADF;
fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
return -errno;
- return btrfs_quota_limit_fd(fd, referenced_max);
+ return btrfs_qgroup_set_limit_fd(fd, qgroupid, 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 btrfs_subvol_set_subtree_quota_limit_fd(int fd, uint64_t subvol_id, uint64_t referenced_max) {
+ uint64_t qgroupid;
int r;
- /* btrfs cannot handle file systems < 16M, hence use this as minimum */
- if (new_size < 16*1024*1024)
- new_size = 16*1024*1024;
+ assert(fd >= 0);
- r = btrfs_get_block_device_fd(fd, &dev);
+ r = btrfs_subvol_find_subtree_qgroup(fd, subvol_id, &qgroupid);
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;
+ return btrfs_qgroup_set_limit_fd(fd, qgroupid, referenced_max);
+}
- backing_fd = open(backing, O_RDWR|O_CLOEXEC|O_NOCTTY);
- if (backing_fd < 0)
- return -errno;
+int btrfs_subvol_set_subtree_quota_limit(const char *path, uint64_t subvol_id, uint64_t referenced_max) {
+ _cleanup_close_ int fd = -EBADF;
- if (fstat(backing_fd, &st) < 0)
+ fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fd < 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;
+ return btrfs_subvol_set_subtree_quota_limit_fd(fd, subvol_id, referenced_max);
+}
- 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;
+int btrfs_qgroupid_make(uint64_t level, uint64_t id, uint64_t *ret) {
+ assert(ret);
- if (snprintf(args.name, sizeof(args.name), "%" PRIu64, new_size) >= (int) sizeof(args.name))
+ if (level >= (UINT64_C(1) << (64 - BTRFS_QGROUP_LEVEL_SHIFT)))
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 (id >= (UINT64_C(1) << BTRFS_QGROUP_LEVEL_SHIFT))
+ return -EINVAL;
- if (ftruncate(backing_fd, new_size) < 0)
- return -errno;
+ *ret = (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
+ return 0;
+}
- if (ioctl(loop_fd, LOOP_SET_CAPACITY, 0) < 0)
- return -errno;
+int btrfs_qgroupid_split(uint64_t qgroupid, uint64_t *level, uint64_t *id) {
+ assert(level || id);
- 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;
- }
+ if (level)
+ *level = qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
- /* Make sure the free disk space is correctly updated for both file systems */
- (void) fsync(fd);
- (void) fsync(backing_fd);
+ if (id)
+ *id = qgroupid & ((UINT64_C(1) << BTRFS_QGROUP_LEVEL_SHIFT) - 1);
- return 1;
+ return 0;
}
-int btrfs_resize_loopback(const char *p, uint64_t new_size, bool grow_only) {
- _cleanup_close_ int fd = -1;
+static int qgroup_create_or_destroy(int fd, bool b, uint64_t qgroupid) {
- fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC);
- if (fd < 0)
- return -errno;
+ struct btrfs_ioctl_qgroup_create_args args = {
+ .create = b,
+ .qgroupid = qgroupid,
+ };
+ int r;
- return btrfs_resize_loopback_fd(fd, new_size, grow_only);
-}
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ENOTTY;
-static int subvol_remove_children(int fd, const char *subvolume, uint64_t subvol_id, bool recursive) {
- struct btrfs_ioctl_search_args args = {
- .key.tree_id = BTRFS_ROOT_TREE_OBJECTID,
+ for (unsigned c = 0;; c++) {
+ if (ioctl(fd, BTRFS_IOC_QGROUP_CREATE, &args) < 0) {
- .key.min_objectid = BTRFS_FIRST_FREE_OBJECTID,
+ /* On old kernels if quota is not enabled, we get EINVAL. On newer kernels we get
+ * ENOTCONN. Let's always convert this to ENOTCONN to make this recognizable
+ * everywhere the same way. */
+
+ if (IN_SET(errno, EINVAL, ENOTCONN))
+ return -ENOTCONN;
+
+ 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 n, r;
+
+ /* Destroys the specified qgroup, but unassigns it from all
+ * its parents first. Also, it recursively destroys all
+ * qgroups it is assigned 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 (int 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);
+
+ return RET_NERRNO(ioctl(fd, BTRFS_IOC_QUOTA_RESCAN, &args));
+}
+
+int btrfs_quota_scan_wait(int fd) {
+ assert(fd >= 0);
+
+ return RET_NERRNO(ioctl(fd, BTRFS_IOC_QUOTA_RESCAN_WAIT));
+}
+
+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,
+ };
+ int r;
+
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ENOTTY;
+
+ for (unsigned 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,
+ .key.max_transid = UINT64_MAX,
};
struct btrfs_ioctl_vol_args vol_args = {};
- _cleanup_close_ int subvol_fd = -1;
+ _cleanup_close_ int subvol_fd = -EBADF;
struct stat st;
+ bool made_writable = false;
int r;
assert(fd >= 0);
if (!S_ISDIR(st.st_mode))
return -EINVAL;
- /* 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)
- return 0;
- if (!recursive || errno != ENOTEMPTY)
- return -errno;
-
- /* OK, the subvolume is not empty, let's look for child
- * subvolumes, and remove them, first */
- subvol_fd = openat(fd, subvolume, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ subvol_fd = openat(fd, subvolume, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (subvol_fd < 0)
return -errno;
+ /* Let's check if this is actually a subvolume. Note that this is mostly redundant, as BTRFS_IOC_SNAP_DESTROY
+ * would fail anyway if it is not. However, it's a good thing to check this ahead of time so that we can return
+ * ENOTTY unconditionally in this case. This is different from the ioctl() which will return EPERM/EACCES if we
+ * don't have the privileges to remove subvolumes, regardless if the specified directory is actually a
+ * subvolume or not. In order to make it easy for callers to cover the "this is not a btrfs subvolume" case
+ * let's prefer ENOTTY over EPERM/EACCES though. */
+ r = btrfs_is_subvol_fd(subvol_fd);
+ if (r < 0)
+ return r;
+ if (r == 0) /* Not a btrfs subvolume */
+ return -ENOTTY;
+
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) {
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 (!p)
return -ENOMEM;
- zero(ino_args);
- ino_args.treeid = subvol_id;
- ino_args.objectid = htole64(ref->dirid);
+ struct btrfs_ioctl_ino_lookup_args ino_args = {
+ .treeid = subvol_id,
+ .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, recursive);
+ r = subvol_remove_children(subvol_fd, p, sh->objectid, flags);
else {
- _cleanup_close_ int child_fd = -1;
+ _cleanup_close_ int child_fd = -EBADF;
/* 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);
+ 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, recursive);
+ r = subvol_remove_children(child_fd, p, sh->objectid, flags);
}
if (r < 0)
return r;
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, bool recursive) {
- _cleanup_close_ int fd = -1;
+int btrfs_subvol_remove(const char *path, BtrfsRemoveFlags flags) {
+ _cleanup_close_ int fd = -EBADF;
const char *subvolume;
int r;
if (r < 0)
return r;
- fd = open_parent(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ fd = open_parent(path, O_CLOEXEC, 0);
if (fd < 0)
return fd;
- return subvol_remove_children(fd, subvolume, 0, recursive);
+ return subvol_remove_children(fd, subvolume, 0, flags);
}
-int btrfs_subvol_remove_fd(int fd, const char *subvolume, bool recursive) {
- return subvol_remove_children(fd, subvolume, 0, recursive);
+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_MAX,
+ };
+
+ int r;
+
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
+ 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;
+ 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 (int i = 0; i < n_old_qgroups; i++) {
+ uint64_t id;
+
+ 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 (int 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 subvol_id, BtrfsSnapshotFlags flags) {
+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.max_type = BTRFS_ROOT_BACKREF_KEY,
.key.min_transid = 0,
- .key.max_transid = (uint64_t) -1,
+ .key.max_transid = UINT64_MAX,
};
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 = -EBADF;
+ uint64_t new_subvol_id;
int r;
- _cleanup_close_ int subvolume_fd = -1;
assert(old_fd >= 0);
assert(new_fd >= 0);
assert(subvolume);
strncpy(vol_args.name, subvolume, sizeof(vol_args.name)-1);
- vol_args.fd = old_fd;
if (ioctl(new_fd, BTRFS_IOC_SNAP_CREATE_V2, &vol_args) < 0)
return -errno;
- if (!(flags & BTRFS_SNAPSHOT_RECURSIVE))
+ if (!(flags & BTRFS_SNAPSHOT_RECURSIVE) &&
+ !(flags & BTRFS_SNAPSHOT_QUOTA))
return 0;
- if (subvol_id == 0) {
- r = btrfs_subvol_get_id_fd(old_fd, &subvol_id);
+ if (old_subvol_id == 0) {
+ r = btrfs_subvol_get_id_fd(old_fd, &old_subvol_id);
if (r < 0)
return r;
}
- args.key.min_offset = args.key.max_offset = subvol_id;
+ 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;
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;
+ _cleanup_close_ int old_child_fd = -EBADF, new_child_fd = -EBADF;
btrfs_ioctl_search_args_set(&args, sh);
if (sh->type != BTRFS_ROOT_BACKREF_KEY)
continue;
- if (sh->offset != subvol_id)
+
+ /* Avoid finding the source subvolume a second
+ * time */
+ if (sh->offset != old_subvol_id)
continue;
- ref = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
+ /* 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 = subvol_id;
- ino_args.objectid = htole64(ref->dirid);
+ struct btrfs_ioctl_ino_lookup_args ino_args = {
+ .treeid = old_subvol_id,
+ .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);
+ c = path_join(ino_args.name, p);
if (!c)
return -ENOMEM;
- old_child_fd = openat(old_fd, c, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ 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, NULL);
+ np = path_join(subvolume, ino_args.name);
if (!np)
return -ENOMEM;
- new_child_fd = openat(new_fd, np, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ new_child_fd = openat(new_fd, np, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (new_child_fd < 0)
return -errno;
* into place. */
if (subvolume_fd < 0) {
- subvolume_fd = openat(new_fd, subvolume, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ subvolume_fd = openat(new_fd, subvolume, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (subvolume_fd < 0)
return -errno;
}
}
/* When btrfs clones the subvolumes, child
- * subvolumes appear as directories. Remove
+ * 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) {
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;
+int btrfs_subvol_snapshot_fd_full(
+ int old_fd,
+ const char *new_path,
+ BtrfsSnapshotFlags flags,
+ copy_progress_path_t progress_path,
+ copy_progress_bytes_t progress_bytes,
+ void *userdata) {
+
+ _cleanup_close_ int new_fd = -EBADF;
const char *subvolume;
int r;
assert(old_fd >= 0);
assert(new_path);
- r = btrfs_is_subvol(old_fd);
+ 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 < 0)
- return r;
+ if (ERRNO_IS_NOT_SUPPORTED(r) && (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 -errno;
- r = copy_directory_fd(old_fd, new_path, true);
- if (r < 0) {
- btrfs_subvol_remove(new_path, false);
+ plain_directory = true;
+ } else if (r < 0)
return r;
- }
+
+ r = copy_directory_fd_full(
+ old_fd, new_path,
+ COPY_MERGE_EMPTY|
+ COPY_REFLINK|
+ COPY_SAME_MOUNT|
+ COPY_HARDLINKS|
+ COPY_ALL_XATTRS|
+ (FLAGS_SET(flags, BTRFS_SNAPSHOT_SIGINT) ? COPY_SIGINT : 0)|
+ (FLAGS_SET(flags, BTRFS_SNAPSHOT_SIGTERM) ? COPY_SIGTERM : 0),
+ progress_path,
+ progress_bytes,
+ userdata);
+ if (r < 0)
+ goto fallback_fail;
if (flags & BTRFS_SNAPSHOT_READ_ONLY) {
- r = btrfs_subvol_set_read_only(new_path, true);
- if (r < 0) {
- btrfs_subvol_remove(new_path, false);
- return r;
+
+ 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, NULL);
+ } 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);
+ new_fd = open_parent(new_path, O_CLOEXEC, 0);
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;
+int btrfs_subvol_snapshot_full(
+ const char *old_path,
+ const char *new_path,
+ BtrfsSnapshotFlags flags,
+ copy_progress_path_t progress_path,
+ copy_progress_bytes_t progress_bytes,
+ void *userdata) {
+
+ _cleanup_close_ int old_fd = -EBADF;
assert(old_path);
assert(new_path);
if (old_fd < 0)
return -errno;
- return btrfs_subvol_snapshot_fd(old_fd, new_path, flags);
+ return btrfs_subvol_snapshot_fd_full(old_fd, new_path, flags, progress_path, progress_bytes, userdata);
+}
+
+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_MAX,
+
+ .key.min_transid = 0,
+ .key.max_transid = UINT64_MAX,
+ };
+
+ _cleanup_free_ uint64_t *items = NULL;
+ size_t n_items = 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 = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
+ 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_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 = TAKE_PTR(items);
+
+ 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;
+ _cleanup_close_ int real_fd = -EBADF;
+ 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.
+ */
+
+ /* Turn this into a proper fd, if it is currently O_PATH */
+ fd = fd_reopen_condition(fd, O_RDONLY|O_CLOEXEC, O_PATH, &real_fd);
+ if (fd < 0)
+ return fd;
+
+ 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;
+
+ /* Determine the lowest qgroup that the parent
+ * subvolume is assigned to. */
+
+ for (int 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 (int 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 = -EBADF;
+
+ 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_MAX,
+
+ .key.min_transid = 0,
+ .key.max_transid = UINT64_MAX,
+ };
+ 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 = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
+ 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;
}
projects / thirdparty / systemd.git / blobdiff