int grow_machine_directory(void) {
char buf[FORMAT_BYTES_MAX];
struct statvfs a, b;
uint64_t old_size, new_size, max_add;
int r;
/* Ensure the disk space data is accurate */
sync_path("/var/lib/machines");
sync_path("/var/lib/machines.raw");
if (statvfs("/var/lib/machines.raw", &a) < 0)
return -errno;
if (statvfs("/var/lib/machines", &b) < 0)
return -errno;
/* Don't grow if not enough disk space is available on the host */
if (((uint64_t) a.f_bavail * (uint64_t) a.f_bsize) <= VAR_LIB_MACHINES_FREE_MIN)
return 0;
/* Don't grow if at least 1/3th of the fs is still free */
if (b.f_bavail > b.f_blocks / 3)
return 0;
/* Calculate how much we are willing to add at most */
max_add = ((uint64_t) a.f_bavail * (uint64_t) a.f_bsize) - VAR_LIB_MACHINES_FREE_MIN;
/* Calculate the old size */
old_size = (uint64_t) b.f_blocks * (uint64_t) b.f_bsize;
/* Calculate the new size as three times the size of what is used right now */
new_size = ((uint64_t) b.f_blocks - (uint64_t) b.f_bavail) * (uint64_t) b.f_bsize * 3;
/* Always, grow at least to the start size */
if (new_size < VAR_LIB_MACHINES_SIZE_START)
new_size = VAR_LIB_MACHINES_SIZE_START;
/* If the new size is smaller than the old size, don't grow */
if (new_size < old_size)
return 0;
/* Ensure we never add more than the maximum */
if (new_size > old_size + max_add)
new_size = old_size + max_add;
r = btrfs_resize_loopback("/var/lib/machines", new_size, true);
if (r <= 0)
return r;
/* Also bump the quota, of both the subvolume leaf qgroup, as
* well as of any subtree quota group by the same id but a
* higher level, if it exists. */
(void) btrfs_qgroup_set_limit("/var/lib/machines", 0, new_size);
(void) btrfs_subvol_set_subtree_quota_limit("/var/lib/machines", 0, new_size);
log_info("Grew /var/lib/machines btrfs loopback file system to %s.", format_bytes(buf, sizeof(buf), new_size));
return 1;
}
int main(int argc, char *argv[]) {
BtrfsQuotaInfo quota;
int r, fd;
fd = open("/", O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
log_error_errno(errno, "Failed to open root directory: %m");
else {
char ts[FORMAT_TIMESTAMP_MAX], bs[FORMAT_BYTES_MAX];
BtrfsSubvolInfo info;
r = btrfs_subvol_get_info_fd(fd, 0, &info);
if (r < 0)
log_error_errno(r, "Failed to get subvolume info: %m");
else {
log_info("otime: %s", format_timestamp(ts, sizeof(ts), info.otime));
log_info("read-only (search): %s", yes_no(info.read_only));
}
r = btrfs_qgroup_get_quota_fd(fd, 0, "a);
if (r < 0)
log_error_errno(r, "Failed to get quota info: %m");
else {
log_info("referenced: %s", strna(format_bytes(bs, sizeof(bs), quota.referenced)));
log_info("exclusive: %s", strna(format_bytes(bs, sizeof(bs), quota.exclusive)));
log_info("referenced_max: %s", strna(format_bytes(bs, sizeof(bs), quota.referenced_max)));
log_info("exclusive_max: %s", strna(format_bytes(bs, sizeof(bs), quota.exclusive_max)));
}
r = btrfs_subvol_get_read_only_fd(fd);
if (r < 0)
log_error_errno(r, "Failed to get read only flag: %m");
else
log_info("read-only (ioctl): %s", yes_no(r));
safe_close(fd);
}
r = btrfs_subvol_make("/xxxtest");
if (r < 0)
log_error_errno(r, "Failed to make subvolume: %m");
r = write_string_file("/xxxtest/afile", "ljsadhfljasdkfhlkjdsfha", WRITE_STRING_FILE_CREATE);
if (r < 0)
log_error_errno(r, "Failed to write file: %m");
r = btrfs_subvol_snapshot("/xxxtest", "/xxxtest2", 0);
if (r < 0)
log_error_errno(r, "Failed to make snapshot: %m");
r = btrfs_subvol_snapshot("/xxxtest", "/xxxtest3", BTRFS_SNAPSHOT_READ_ONLY);
if (r < 0)
log_error_errno(r, "Failed to make snapshot: %m");
r = btrfs_subvol_remove("/xxxtest", BTRFS_REMOVE_QUOTA);
if (r < 0)
log_error_errno(r, "Failed to remove subvolume: %m");
r = btrfs_subvol_remove("/xxxtest2", BTRFS_REMOVE_QUOTA);
if (r < 0)
log_error_errno(r, "Failed to remove subvolume: %m");
r = btrfs_subvol_remove("/xxxtest3", BTRFS_REMOVE_QUOTA);
if (r < 0)
log_error_errno(r, "Failed to remove subvolume: %m");
r = btrfs_subvol_snapshot("/etc", "/etc2", BTRFS_SNAPSHOT_READ_ONLY|BTRFS_SNAPSHOT_FALLBACK_COPY);
if (r < 0)
log_error_errno(r, "Failed to make snapshot: %m");
r = btrfs_subvol_remove("/etc2", BTRFS_REMOVE_QUOTA);
if (r < 0)
log_error_errno(r, "Failed to remove subvolume: %m");
r = btrfs_subvol_make("/xxxrectest");
if (r < 0)
log_error_errno(r, "Failed to make subvolume: %m");
r = btrfs_subvol_make("/xxxrectest/xxxrectest2");
if (r < 0)
log_error_errno(r, "Failed to make subvolume: %m");
r = btrfs_subvol_make("/xxxrectest/xxxrectest3");
if (r < 0)
log_error_errno(r, "Failed to make subvolume: %m");
r = btrfs_subvol_make("/xxxrectest/xxxrectest3/sub");
if (r < 0)
log_error_errno(r, "Failed to make subvolume: %m");
if (mkdir("/xxxrectest/dir", 0755) < 0)
log_error_errno(errno, "Failed to make directory: %m");
r = btrfs_subvol_make("/xxxrectest/dir/xxxrectest4");
if (r < 0)
log_error_errno(r, "Failed to make subvolume: %m");
if (mkdir("/xxxrectest/dir/xxxrectest4/dir", 0755) < 0)
log_error_errno(errno, "Failed to make directory: %m");
r = btrfs_subvol_make("/xxxrectest/dir/xxxrectest4/dir/xxxrectest5");
if (r < 0)
log_error_errno(r, "Failed to make subvolume: %m");
if (mkdir("/xxxrectest/mnt", 0755) < 0)
log_error_errno(errno, "Failed to make directory: %m");
r = btrfs_subvol_snapshot("/xxxrectest", "/xxxrectest2", BTRFS_SNAPSHOT_RECURSIVE);
if (r < 0)
log_error_errno(r, "Failed to snapshot subvolume: %m");
r = btrfs_subvol_remove("/xxxrectest", BTRFS_REMOVE_QUOTA|BTRFS_REMOVE_RECURSIVE);
if (r < 0)
log_error_errno(r, "Failed to recursively remove subvolume: %m");
r = btrfs_subvol_remove("/xxxrectest2", BTRFS_REMOVE_QUOTA|BTRFS_REMOVE_RECURSIVE);
if (r < 0)
log_error_errno(r, "Failed to recursively remove subvolume: %m");
r = btrfs_subvol_make("/xxxquotatest");
if (r < 0)
log_error_errno(r, "Failed to make subvolume: %m");
r = btrfs_subvol_auto_qgroup("/xxxquotatest", 0, true);
if (r < 0)
log_error_errno(r, "Failed to set up auto qgroup: %m");
r = btrfs_subvol_make("/xxxquotatest/beneath");
if (r < 0)
log_error_errno(r, "Failed to make subvolume: %m");
r = btrfs_subvol_auto_qgroup("/xxxquotatest/beneath", 0, false);
if (r < 0)
log_error_errno(r, "Failed to set up auto qgroup: %m");
r = btrfs_qgroup_set_limit("/xxxquotatest/beneath", 0, 4ULL * 1024 * 1024 * 1024);
if (r < 0)
log_error_errno(r, "Failed to set up quota limit: %m");
r = btrfs_subvol_set_subtree_quota_limit("/xxxquotatest", 0, 5ULL * 1024 * 1024 * 1024);
if (r < 0)
log_error_errno(r, "Failed to set up quota limit: %m");
r = btrfs_subvol_snapshot("/xxxquotatest", "/xxxquotatest2", BTRFS_SNAPSHOT_RECURSIVE|BTRFS_SNAPSHOT_QUOTA);
if (r < 0)
log_error_errno(r, "Failed to setup snapshot: %m");
r = btrfs_qgroup_get_quota("/xxxquotatest2/beneath", 0, "a);
if (r < 0)
log_error_errno(r, "Failed to query quota: %m");
assert_se(quota.referenced_max == 4ULL * 1024 * 1024 * 1024);
r = btrfs_subvol_get_subtree_quota("/xxxquotatest2", 0, "a);
if (r < 0)
log_error_errno(r, "Failed to query quota: %m");
assert_se(quota.referenced_max == 5ULL * 1024 * 1024 * 1024);
r = btrfs_subvol_remove("/xxxquotatest", BTRFS_REMOVE_QUOTA|BTRFS_REMOVE_RECURSIVE);
if (r < 0)
log_error_errno(r, "Failed remove subvolume: %m");
r = btrfs_subvol_remove("/xxxquotatest2", BTRFS_REMOVE_QUOTA|BTRFS_REMOVE_RECURSIVE);
if (r < 0)
log_error_errno(r, "Failed remove subvolume: %m");
return 0;
}
