mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-19 12:55:38 +00:00
6b8fed9e79
By using find_mount_fsroot we ensure that we return a valid path to the final user, by ensuring that even if we return a bind mount, the pathname of btrfs used was the same from the original mount. This for a case when bind mounts and normal mount -o subvol=/path are mixed. Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
702 lines
16 KiB
C
702 lines
16 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <getopt.h>
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#include <limits.h>
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#include "kerncompat.h"
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#include "ioctl.h"
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#include "common/utils.h"
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#include "kernel-shared/ctree.h"
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#include "common/send-utils.h"
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#include "kernel-shared/disk-io.h"
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#include "cmds/commands.h"
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#include "btrfs-list.h"
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#include "common/help.h"
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static const char * const inspect_cmd_group_usage[] = {
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"btrfs inspect-internal <command> <args>",
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NULL
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};
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static int __ino_to_path_fd(u64 inum, int fd, const char *prepend)
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{
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int ret;
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int i;
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struct btrfs_ioctl_ino_path_args ipa;
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struct btrfs_data_container fspath[PATH_MAX];
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memset(fspath, 0, sizeof(*fspath));
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ipa.inum = inum;
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ipa.size = PATH_MAX;
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ipa.fspath = ptr_to_u64(fspath);
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ret = ioctl(fd, BTRFS_IOC_INO_PATHS, &ipa);
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if (ret < 0) {
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error("ino paths ioctl: %m");
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goto out;
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}
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pr_verbose(1,
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"ioctl ret=%d, bytes_left=%lu, bytes_missing=%lu cnt=%d, missed=%d\n",
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ret, (unsigned long)fspath->bytes_left,
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(unsigned long)fspath->bytes_missing, fspath->elem_cnt,
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fspath->elem_missed);
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for (i = 0; i < fspath->elem_cnt; ++i) {
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u64 ptr;
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char *str;
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ptr = (u64)(unsigned long)fspath->val;
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ptr += fspath->val[i];
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str = (char *)(unsigned long)ptr;
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if (prepend)
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printf("%s/%s\n", prepend, str);
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else
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printf("%s\n", str);
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}
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out:
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return !!ret;
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}
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static const char * const cmd_inspect_inode_resolve_usage[] = {
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"btrfs inspect-internal inode-resolve [-v] <inode> <path>",
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"Get file system paths for the given inode",
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"",
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"-v deprecated, alias for global -v option",
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HELPINFO_INSERT_GLOBALS,
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HELPINFO_INSERT_VERBOSE,
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NULL
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};
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static int cmd_inspect_inode_resolve(const struct cmd_struct *cmd,
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int argc, char **argv)
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{
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int fd;
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int ret;
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DIR *dirstream = NULL;
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optind = 0;
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while (1) {
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int c = getopt(argc, argv, "v");
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if (c < 0)
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break;
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switch (c) {
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case 'v':
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bconf_be_verbose();
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break;
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default:
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usage_unknown_option(cmd, argv);
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}
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}
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if (check_argc_exact(argc - optind, 2))
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return 1;
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fd = btrfs_open_dir(argv[optind + 1], &dirstream, 1);
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if (fd < 0)
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return 1;
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ret = __ino_to_path_fd(arg_strtou64(argv[optind]), fd, argv[optind+1]);
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close_file_or_dir(fd, dirstream);
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return !!ret;
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}
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static DEFINE_SIMPLE_COMMAND(inspect_inode_resolve, "inode-resolve");
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static const char * const cmd_inspect_logical_resolve_usage[] = {
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"btrfs inspect-internal logical-resolve [-Pvo] [-s bufsize] <logical> <path>",
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"Get file system paths for the given logical address",
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"",
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"-P skip the path resolving and print the inodes instead",
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"-o ignore offsets when matching references (requires v2 ioctl",
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" support in the kernel 4.15+)",
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"-s bufsize set inode container's size. This is used to increase inode",
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" container's size in case it is not enough to read all the ",
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" resolved results. The max value one can set is 64k with the",
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" v1 ioctl. Sizes over 64k will use the v2 ioctl (kernel 4.15+)",
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"-v deprecated, alias for global -v option",
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HELPINFO_INSERT_GLOBALS,
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HELPINFO_INSERT_VERBOSE,
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NULL
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};
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static int cmd_inspect_logical_resolve(const struct cmd_struct *cmd,
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int argc, char **argv)
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{
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int ret;
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int fd;
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int i;
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int getpath = 1;
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int bytes_left;
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struct btrfs_ioctl_logical_ino_args loi = { 0 };
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struct btrfs_data_container *inodes;
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u64 size = SZ_64K;
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char full_path[PATH_MAX];
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char *path_ptr;
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DIR *dirstream = NULL;
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u64 flags = 0;
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unsigned long request = BTRFS_IOC_LOGICAL_INO;
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optind = 0;
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while (1) {
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int c = getopt(argc, argv, "Pvos:");
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if (c < 0)
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break;
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switch (c) {
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case 'P':
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getpath = 0;
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break;
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case 'v':
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bconf_be_verbose();
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break;
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case 'o':
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flags |= BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
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break;
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case 's':
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size = arg_strtou64(optarg);
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break;
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default:
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usage_unknown_option(cmd, argv);
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}
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}
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if (check_argc_exact(argc - optind, 2))
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return 1;
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size = min(size, (u64)SZ_16M);
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inodes = malloc(size);
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if (!inodes)
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return 1;
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if (size > SZ_64K || flags != 0)
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request = BTRFS_IOC_LOGICAL_INO_V2;
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memset(inodes, 0, sizeof(*inodes));
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loi.logical = arg_strtou64(argv[optind]);
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loi.size = size;
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loi.flags = flags;
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loi.inodes = ptr_to_u64(inodes);
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fd = btrfs_open_dir(argv[optind + 1], &dirstream, 1);
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if (fd < 0) {
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ret = 12;
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goto out;
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}
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ret = ioctl(fd, request, &loi);
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if (ret < 0) {
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error("logical ino ioctl: %m");
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goto out;
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}
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pr_verbose(1,
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"ioctl ret=%d, total_size=%llu, bytes_left=%lu, bytes_missing=%lu, cnt=%d, missed=%d\n",
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ret, size, (unsigned long)inodes->bytes_left,
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(unsigned long)inodes->bytes_missing, inodes->elem_cnt,
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inodes->elem_missed);
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bytes_left = sizeof(full_path);
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ret = snprintf(full_path, bytes_left, "%s/", argv[optind+1]);
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path_ptr = full_path + ret;
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bytes_left -= ret + 1;
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if (bytes_left < 0) {
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error("path buffer too small: %d bytes", bytes_left);
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goto out;
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}
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ret = 0;
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for (i = 0; i < inodes->elem_cnt; i += 3) {
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u64 inum = inodes->val[i];
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u64 offset = inodes->val[i+1];
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u64 root = inodes->val[i+2];
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int path_fd;
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char *name;
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DIR *dirs = NULL;
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if (getpath) {
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char mount_path[PATH_MAX];
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name = btrfs_list_path_for_root(fd, root);
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if (IS_ERR(name)) {
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ret = PTR_ERR(name);
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goto out;
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}
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if (!name) {
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path_ptr[-1] = '\0';
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path_fd = fd;
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strncpy(mount_path, full_path, PATH_MAX);
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} else {
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char *mounted = NULL;
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char subvol[PATH_MAX];
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char subvolid[PATH_MAX];
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/*
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* btrfs_list_path_for_root returns the full
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* path to the subvolume pointed by root, but the
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* subvolume can be mounted in a directory name
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* different from the subvolume name. In this
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* case we need to find the correct mount point
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* using same subvolume path and subvol id found
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* before.
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*/
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snprintf(subvol, PATH_MAX, "/%s", name);
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snprintf(subvolid, PATH_MAX, "%llu", root);
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ret = find_mount_fsroot(subvol, subvolid, &mounted);
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if (ret) {
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error("failed to parse mountinfo");
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goto out;
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}
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if (!mounted) {
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printf(
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"inode %llu subvol %s could not be accessed: not mounted\n",
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inum, name);
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continue;
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}
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strncpy(mount_path, mounted, PATH_MAX);
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free(mounted);
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path_fd = btrfs_open_dir(mount_path, &dirs, 1);
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if (path_fd < 0) {
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ret = -ENOENT;
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goto out;
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}
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}
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ret = __ino_to_path_fd(inum, path_fd, mount_path);
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if (path_fd != fd)
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close_file_or_dir(path_fd, dirs);
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} else {
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printf("inode %llu offset %llu root %llu\n", inum,
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offset, root);
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}
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}
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out:
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close_file_or_dir(fd, dirstream);
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free(inodes);
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return !!ret;
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}
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static DEFINE_SIMPLE_COMMAND(inspect_logical_resolve, "logical-resolve");
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static const char * const cmd_inspect_subvolid_resolve_usage[] = {
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"btrfs inspect-internal subvolid-resolve <subvolid> <path>",
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"Get file system paths for the given subvolume ID.",
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NULL
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};
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static int cmd_inspect_subvolid_resolve(const struct cmd_struct *cmd,
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int argc, char **argv)
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{
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int ret;
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int fd = -1;
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u64 subvol_id;
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char path[PATH_MAX];
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DIR *dirstream = NULL;
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clean_args_no_options(cmd, argc, argv);
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if (check_argc_exact(argc - optind, 2))
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return 1;
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fd = btrfs_open_dir(argv[optind + 1], &dirstream, 1);
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if (fd < 0) {
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ret = -ENOENT;
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goto out;
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}
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subvol_id = arg_strtou64(argv[optind]);
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ret = btrfs_subvolid_resolve(fd, path, sizeof(path), subvol_id);
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if (ret) {
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error("resolving subvolid %llu error %d",
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(unsigned long long)subvol_id, ret);
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goto out;
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}
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path[PATH_MAX - 1] = '\0';
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printf("%s\n", path);
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out:
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close_file_or_dir(fd, dirstream);
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return !!ret;
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}
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static DEFINE_SIMPLE_COMMAND(inspect_subvolid_resolve, "subvolid-resolve");
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static const char* const cmd_inspect_rootid_usage[] = {
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"btrfs inspect-internal rootid <path>",
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"Get tree ID of the containing subvolume of path.",
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NULL
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};
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static int cmd_inspect_rootid(const struct cmd_struct *cmd,
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int argc, char **argv)
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{
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int ret;
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int fd = -1;
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u64 rootid;
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DIR *dirstream = NULL;
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clean_args_no_options(cmd, argc, argv);
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if (check_argc_exact(argc - optind, 1))
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return 1;
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fd = btrfs_open_file_or_dir(argv[optind], &dirstream, 1);
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if (fd < 0) {
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ret = -ENOENT;
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goto out;
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}
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ret = lookup_path_rootid(fd, &rootid);
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if (ret) {
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errno = -ret;
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error("failed to lookup root id: %m");
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goto out;
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}
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printf("%llu\n", (unsigned long long)rootid);
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out:
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close_file_or_dir(fd, dirstream);
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return !!ret;
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}
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static DEFINE_SIMPLE_COMMAND(inspect_rootid, "rootid");
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static const char* const cmd_inspect_min_dev_size_usage[] = {
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"btrfs inspect-internal min-dev-size [options] <path>",
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"Get the minimum size the device can be shrunk to. The",
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"device id 1 is used by default.",
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"",
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"--id DEVID specify the device id to query",
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NULL
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};
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struct dev_extent_elem {
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u64 start;
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/* inclusive end */
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u64 end;
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struct list_head list;
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};
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static int add_dev_extent(struct list_head *list,
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const u64 start, const u64 end,
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const int append)
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{
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struct dev_extent_elem *e;
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e = malloc(sizeof(*e));
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if (!e)
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return -ENOMEM;
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e->start = start;
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e->end = end;
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if (append)
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list_add_tail(&e->list, list);
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else
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list_add(&e->list, list);
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return 0;
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}
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static void free_dev_extent_list(struct list_head *list)
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{
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while (!list_empty(list)) {
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struct dev_extent_elem *e;
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e = list_first_entry(list, struct dev_extent_elem, list);
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list_del(&e->list);
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free(e);
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}
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}
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static int hole_includes_sb_mirror(const u64 start, const u64 end)
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{
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int i;
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int ret = 0;
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for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
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u64 bytenr = btrfs_sb_offset(i);
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if (bytenr >= start && bytenr <= end) {
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ret = 1;
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break;
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}
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}
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return ret;
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}
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static void adjust_dev_min_size(struct list_head *extents,
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struct list_head *holes,
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u64 *min_size)
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{
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/*
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* If relocation of the block group of a device extent must happen (see
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* below) scratch space is used for the relocation. So track here the
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* size of the largest device extent that has to be relocated. We track
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* only the largest and not the sum of the sizes of all relocated block
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* groups because after each block group is relocated the running
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* transaction is committed so that pinned space is released.
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*/
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u64 scratch_space = 0;
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/*
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* List of device extents is sorted by descending order of the extent's
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* end offset. If some extent goes beyond the computed minimum size,
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* which initially matches the sum of the lengths of all extents,
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* we need to check if the extent can be relocated to an hole in the
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* device between [0, *min_size[ (which is what the resize ioctl does).
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*/
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while (!list_empty(extents)) {
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struct dev_extent_elem *e;
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struct dev_extent_elem *h;
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int found = 0;
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u64 extent_len;
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u64 hole_len = 0;
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e = list_first_entry(extents, struct dev_extent_elem, list);
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if (e->end <= *min_size)
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break;
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/*
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* Our extent goes beyond the computed *min_size. See if we can
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* find a hole large enough to relocate it to. If not we must stop
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* and set *min_size to the end of the extent.
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*/
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extent_len = e->end - e->start + 1;
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list_for_each_entry(h, holes, list) {
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hole_len = h->end - h->start + 1;
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if (hole_len >= extent_len) {
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found = 1;
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break;
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}
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}
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if (!found) {
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*min_size = e->end + 1;
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break;
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}
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/*
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* If the hole found contains the location for a superblock
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* mirror, we are pessimistic and require allocating one
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* more extent of the same size. This is because the block
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* group could be in the worst case used by a single extent
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* with a size >= (block_group.length - superblock.size).
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*/
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if (hole_includes_sb_mirror(h->start,
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h->start + extent_len - 1))
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*min_size += extent_len;
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if (hole_len > extent_len) {
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h->start += extent_len;
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} else {
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list_del(&h->list);
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free(h);
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}
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list_del(&e->list);
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free(e);
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if (extent_len > scratch_space)
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scratch_space = extent_len;
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}
|
|
|
|
if (scratch_space) {
|
|
*min_size += scratch_space;
|
|
/*
|
|
* Chunk allocation requires inserting/updating items in the
|
|
* chunk tree, so often this can lead to the need of allocating
|
|
* a new system chunk too, which has a maximum size of 32Mb.
|
|
*/
|
|
*min_size += SZ_32M;
|
|
}
|
|
}
|
|
|
|
static int print_min_dev_size(int fd, u64 devid)
|
|
{
|
|
int ret = 1;
|
|
/*
|
|
* Device allocations starts at 1Mb or at the value passed through the
|
|
* mount option alloc_start if it's bigger than 1Mb. The alloc_start
|
|
* option is used for debugging and testing only, and recently the
|
|
* possibility of deprecating/removing it has been discussed, so we
|
|
* ignore it here.
|
|
*/
|
|
u64 min_size = SZ_1M;
|
|
struct btrfs_ioctl_search_args args;
|
|
struct btrfs_ioctl_search_key *sk = &args.key;
|
|
u64 last_pos = (u64)-1;
|
|
LIST_HEAD(extents);
|
|
LIST_HEAD(holes);
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
sk->tree_id = BTRFS_DEV_TREE_OBJECTID;
|
|
sk->min_objectid = devid;
|
|
sk->max_objectid = devid;
|
|
sk->max_type = BTRFS_DEV_EXTENT_KEY;
|
|
sk->min_type = BTRFS_DEV_EXTENT_KEY;
|
|
sk->min_offset = 0;
|
|
sk->max_offset = (u64)-1;
|
|
sk->min_transid = 0;
|
|
sk->max_transid = (u64)-1;
|
|
sk->nr_items = 4096;
|
|
|
|
while (1) {
|
|
int i;
|
|
struct btrfs_ioctl_search_header *sh;
|
|
unsigned long off = 0;
|
|
|
|
ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
|
|
if (ret < 0) {
|
|
error("tree search ioctl: %m");
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (sk->nr_items == 0)
|
|
break;
|
|
|
|
for (i = 0; i < sk->nr_items; i++) {
|
|
struct btrfs_dev_extent *extent;
|
|
u64 len;
|
|
|
|
sh = (struct btrfs_ioctl_search_header *)(args.buf +
|
|
off);
|
|
off += sizeof(*sh);
|
|
extent = (struct btrfs_dev_extent *)(args.buf + off);
|
|
off += btrfs_search_header_len(sh);
|
|
|
|
sk->min_objectid = btrfs_search_header_objectid(sh);
|
|
sk->min_type = btrfs_search_header_type(sh);
|
|
sk->min_offset = btrfs_search_header_offset(sh) + 1;
|
|
|
|
if (btrfs_search_header_objectid(sh) != devid ||
|
|
btrfs_search_header_type(sh) != BTRFS_DEV_EXTENT_KEY)
|
|
continue;
|
|
|
|
len = btrfs_stack_dev_extent_length(extent);
|
|
min_size += len;
|
|
ret = add_dev_extent(&extents,
|
|
btrfs_search_header_offset(sh),
|
|
btrfs_search_header_offset(sh) + len - 1, 0);
|
|
|
|
if (!ret && last_pos != (u64)-1 &&
|
|
last_pos != btrfs_search_header_offset(sh))
|
|
ret = add_dev_extent(&holes, last_pos,
|
|
btrfs_search_header_offset(sh) - 1, 1);
|
|
if (ret) {
|
|
errno = -ret;
|
|
error("add device extent: %m");
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
last_pos = btrfs_search_header_offset(sh) + len;
|
|
}
|
|
|
|
if (sk->min_type != BTRFS_DEV_EXTENT_KEY ||
|
|
sk->min_objectid != devid)
|
|
break;
|
|
}
|
|
|
|
adjust_dev_min_size(&extents, &holes, &min_size);
|
|
printf("%llu bytes (%s)\n", min_size, pretty_size(min_size));
|
|
ret = 0;
|
|
out:
|
|
free_dev_extent_list(&extents);
|
|
free_dev_extent_list(&holes);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int cmd_inspect_min_dev_size(const struct cmd_struct *cmd,
|
|
int argc, char **argv)
|
|
{
|
|
int ret;
|
|
int fd = -1;
|
|
DIR *dirstream = NULL;
|
|
u64 devid = 1;
|
|
|
|
optind = 0;
|
|
while (1) {
|
|
int c;
|
|
enum { GETOPT_VAL_DEVID = 256 };
|
|
static const struct option long_options[] = {
|
|
{ "id", required_argument, NULL, GETOPT_VAL_DEVID },
|
|
{NULL, 0, NULL, 0}
|
|
};
|
|
|
|
c = getopt_long(argc, argv, "", long_options, NULL);
|
|
if (c < 0)
|
|
break;
|
|
|
|
switch (c) {
|
|
case GETOPT_VAL_DEVID:
|
|
devid = arg_strtou64(optarg);
|
|
break;
|
|
default:
|
|
usage_unknown_option(cmd, argv);
|
|
}
|
|
}
|
|
if (check_argc_exact(argc - optind, 1))
|
|
return 1;
|
|
|
|
fd = btrfs_open_dir(argv[optind], &dirstream, 1);
|
|
if (fd < 0) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
ret = print_min_dev_size(fd, devid);
|
|
close_file_or_dir(fd, dirstream);
|
|
out:
|
|
return !!ret;
|
|
}
|
|
static DEFINE_SIMPLE_COMMAND(inspect_min_dev_size, "min-dev-size");
|
|
|
|
static const char inspect_cmd_group_info[] =
|
|
"query various internal information";
|
|
|
|
static const struct cmd_group inspect_cmd_group = {
|
|
inspect_cmd_group_usage, inspect_cmd_group_info, {
|
|
&cmd_struct_inspect_inode_resolve,
|
|
&cmd_struct_inspect_logical_resolve,
|
|
&cmd_struct_inspect_subvolid_resolve,
|
|
&cmd_struct_inspect_rootid,
|
|
&cmd_struct_inspect_min_dev_size,
|
|
&cmd_struct_inspect_dump_tree,
|
|
&cmd_struct_inspect_dump_super,
|
|
&cmd_struct_inspect_tree_stats,
|
|
NULL
|
|
}
|
|
};
|
|
|
|
DEFINE_GROUP_COMMAND(inspect, "inspect-internal");
|