mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-16 11:25:31 +00:00
e9b5ff23ea
After Patch: remove BTRFS_SCAN_PROC scan method There isn't any consumer for btrfs_scan_block_devices() so delete it. Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.cz>
2814 lines
65 KiB
C
2814 lines
65 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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* Copyright (C) 2008 Morey Roof. All rights reserved.
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*
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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 <string.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <uuid/uuid.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <mntent.h>
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#include <ctype.h>
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#include <linux/loop.h>
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#include <linux/major.h>
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#include <linux/kdev_t.h>
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#include <limits.h>
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#include <blkid/blkid.h>
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#include <sys/vfs.h>
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#include "kerncompat.h"
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#include "radix-tree.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "crc32c.h"
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#include "utils.h"
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#include "volumes.h"
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#include "ioctl.h"
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#ifndef BLKDISCARD
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#define BLKDISCARD _IO(0x12,119)
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#endif
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static int btrfs_scan_done = 0;
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static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
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void fixup_argv0(char **argv, const char *token)
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{
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int len = strlen(argv0_buf);
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snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
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argv[0] = argv0_buf;
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}
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void set_argv0(char **argv)
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{
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strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
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argv0_buf[sizeof(argv0_buf) - 1] = 0;
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}
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int check_argc_exact(int nargs, int expected)
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{
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if (nargs < expected)
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fprintf(stderr, "%s: too few arguments\n", argv0_buf);
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if (nargs > expected)
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fprintf(stderr, "%s: too many arguments\n", argv0_buf);
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return nargs != expected;
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}
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int check_argc_min(int nargs, int expected)
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{
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if (nargs < expected) {
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fprintf(stderr, "%s: too few arguments\n", argv0_buf);
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return 1;
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}
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return 0;
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}
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int check_argc_max(int nargs, int expected)
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{
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if (nargs > expected) {
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fprintf(stderr, "%s: too many arguments\n", argv0_buf);
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return 1;
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}
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return 0;
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}
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/*
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* Discard the given range in one go
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*/
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static int discard_range(int fd, u64 start, u64 len)
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{
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u64 range[2] = { start, len };
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if (ioctl(fd, BLKDISCARD, &range) < 0)
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return errno;
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return 0;
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}
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/*
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* Discard blocks in the given range in 1G chunks, the process is interruptible
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*/
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static int discard_blocks(int fd, u64 start, u64 len)
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{
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while (len > 0) {
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/* 1G granularity */
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u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
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int ret;
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ret = discard_range(fd, start, chunk_size);
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if (ret)
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return ret;
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len -= chunk_size;
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start += chunk_size;
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}
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return 0;
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}
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static u64 reference_root_table[] = {
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[1] = BTRFS_ROOT_TREE_OBJECTID,
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[2] = BTRFS_EXTENT_TREE_OBJECTID,
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[3] = BTRFS_CHUNK_TREE_OBJECTID,
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[4] = BTRFS_DEV_TREE_OBJECTID,
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[5] = BTRFS_FS_TREE_OBJECTID,
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[6] = BTRFS_CSUM_TREE_OBJECTID,
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};
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int test_uuid_unique(char *fs_uuid)
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{
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int unique = 1;
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blkid_dev_iterate iter = NULL;
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blkid_dev dev = NULL;
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blkid_cache cache = NULL;
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if (blkid_get_cache(&cache, 0) < 0) {
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printf("ERROR: lblkid cache get failed\n");
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return 1;
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}
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blkid_probe_all(cache);
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iter = blkid_dev_iterate_begin(cache);
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blkid_dev_set_search(iter, "UUID", fs_uuid);
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while (blkid_dev_next(iter, &dev) == 0) {
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dev = blkid_verify(cache, dev);
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if (dev) {
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unique = 0;
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break;
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}
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}
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blkid_dev_iterate_end(iter);
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blkid_put_cache(cache);
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return unique;
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}
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int make_btrfs(int fd, const char *device, const char *label, char *fs_uuid,
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u64 blocks[7], u64 num_bytes, u32 nodesize,
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u32 sectorsize, u32 stripesize, u64 features)
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{
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struct btrfs_super_block super;
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struct extent_buffer *buf = NULL;
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struct btrfs_root_item root_item;
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struct btrfs_disk_key disk_key;
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struct btrfs_extent_item *extent_item;
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struct btrfs_inode_item *inode_item;
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struct btrfs_chunk *chunk;
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struct btrfs_dev_item *dev_item;
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struct btrfs_dev_extent *dev_extent;
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u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
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u8 *ptr;
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int i;
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int ret;
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u32 itemoff;
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u32 nritems = 0;
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u64 first_free;
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u64 ref_root;
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u32 array_size;
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u32 item_size;
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int skinny_metadata = !!(features &
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BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
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first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
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first_free &= ~((u64)sectorsize - 1);
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memset(&super, 0, sizeof(super));
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num_bytes = (num_bytes / sectorsize) * sectorsize;
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if (fs_uuid) {
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if (uuid_parse(fs_uuid, super.fsid) != 0) {
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fprintf(stderr, "could not parse UUID: %s\n", fs_uuid);
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ret = -EINVAL;
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goto out;
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}
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if (!test_uuid_unique(fs_uuid)) {
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fprintf(stderr, "non-unique UUID: %s\n", fs_uuid);
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ret = -EBUSY;
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goto out;
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}
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} else {
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uuid_generate(super.fsid);
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}
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uuid_generate(super.dev_item.uuid);
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uuid_generate(chunk_tree_uuid);
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btrfs_set_super_bytenr(&super, blocks[0]);
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btrfs_set_super_num_devices(&super, 1);
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btrfs_set_super_magic(&super, BTRFS_MAGIC);
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btrfs_set_super_generation(&super, 1);
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btrfs_set_super_root(&super, blocks[1]);
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btrfs_set_super_chunk_root(&super, blocks[3]);
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btrfs_set_super_total_bytes(&super, num_bytes);
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btrfs_set_super_bytes_used(&super, 6 * nodesize);
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btrfs_set_super_sectorsize(&super, sectorsize);
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btrfs_set_super_leafsize(&super, nodesize);
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btrfs_set_super_nodesize(&super, nodesize);
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btrfs_set_super_stripesize(&super, stripesize);
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btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
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btrfs_set_super_chunk_root_generation(&super, 1);
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btrfs_set_super_cache_generation(&super, -1);
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btrfs_set_super_incompat_flags(&super, features);
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if (label)
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strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
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buf = malloc(sizeof(*buf) + max(sectorsize, nodesize));
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/* create the tree of root objects */
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memset(buf->data, 0, nodesize);
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buf->len = nodesize;
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btrfs_set_header_bytenr(buf, blocks[1]);
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btrfs_set_header_nritems(buf, 4);
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btrfs_set_header_generation(buf, 1);
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btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
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btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
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write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
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BTRFS_FSID_SIZE);
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write_extent_buffer(buf, chunk_tree_uuid,
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btrfs_header_chunk_tree_uuid(buf),
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BTRFS_UUID_SIZE);
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/* create the items for the root tree */
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memset(&root_item, 0, sizeof(root_item));
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inode_item = &root_item.inode;
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btrfs_set_stack_inode_generation(inode_item, 1);
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btrfs_set_stack_inode_size(inode_item, 3);
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btrfs_set_stack_inode_nlink(inode_item, 1);
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btrfs_set_stack_inode_nbytes(inode_item, nodesize);
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btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
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btrfs_set_root_refs(&root_item, 1);
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btrfs_set_root_used(&root_item, nodesize);
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btrfs_set_root_generation(&root_item, 1);
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memset(&disk_key, 0, sizeof(disk_key));
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btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
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btrfs_set_disk_key_offset(&disk_key, 0);
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nritems = 0;
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itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) - sizeof(root_item);
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btrfs_set_root_bytenr(&root_item, blocks[2]);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(nritems),
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sizeof(root_item));
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write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
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nritems), sizeof(root_item));
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nritems++;
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itemoff = itemoff - sizeof(root_item);
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btrfs_set_root_bytenr(&root_item, blocks[4]);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(nritems),
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sizeof(root_item));
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write_extent_buffer(buf, &root_item,
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btrfs_item_ptr_offset(buf, nritems),
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sizeof(root_item));
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nritems++;
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itemoff = itemoff - sizeof(root_item);
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btrfs_set_root_bytenr(&root_item, blocks[5]);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(nritems),
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sizeof(root_item));
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write_extent_buffer(buf, &root_item,
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btrfs_item_ptr_offset(buf, nritems),
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sizeof(root_item));
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nritems++;
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itemoff = itemoff - sizeof(root_item);
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btrfs_set_root_bytenr(&root_item, blocks[6]);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(nritems),
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sizeof(root_item));
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write_extent_buffer(buf, &root_item,
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btrfs_item_ptr_offset(buf, nritems),
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sizeof(root_item));
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nritems++;
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csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
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ret = pwrite(fd, buf->data, nodesize, blocks[1]);
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if (ret != nodesize) {
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ret = (ret < 0 ? -errno : -EIO);
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goto out;
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}
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/* create the items for the extent tree */
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memset(buf->data + sizeof(struct btrfs_header), 0,
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nodesize - sizeof(struct btrfs_header));
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nritems = 0;
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itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize);
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for (i = 1; i < 7; i++) {
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item_size = sizeof(struct btrfs_extent_item);
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if (!skinny_metadata)
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item_size += sizeof(struct btrfs_tree_block_info);
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BUG_ON(blocks[i] < first_free);
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BUG_ON(blocks[i] < blocks[i - 1]);
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/* create extent item */
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itemoff -= item_size;
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btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
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if (skinny_metadata) {
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btrfs_set_disk_key_type(&disk_key,
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BTRFS_METADATA_ITEM_KEY);
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btrfs_set_disk_key_offset(&disk_key, 0);
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} else {
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btrfs_set_disk_key_type(&disk_key,
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BTRFS_EXTENT_ITEM_KEY);
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btrfs_set_disk_key_offset(&disk_key, nodesize);
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}
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
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itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(nritems),
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item_size);
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extent_item = btrfs_item_ptr(buf, nritems,
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struct btrfs_extent_item);
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btrfs_set_extent_refs(buf, extent_item, 1);
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btrfs_set_extent_generation(buf, extent_item, 1);
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btrfs_set_extent_flags(buf, extent_item,
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BTRFS_EXTENT_FLAG_TREE_BLOCK);
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nritems++;
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/* create extent ref */
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ref_root = reference_root_table[i];
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btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
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btrfs_set_disk_key_offset(&disk_key, ref_root);
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btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
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itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
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nritems++;
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}
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btrfs_set_header_bytenr(buf, blocks[2]);
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btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
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btrfs_set_header_nritems(buf, nritems);
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csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
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ret = pwrite(fd, buf->data, nodesize, blocks[2]);
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if (ret != nodesize) {
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ret = (ret < 0 ? -errno : -EIO);
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goto out;
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}
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/* create the chunk tree */
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memset(buf->data + sizeof(struct btrfs_header), 0,
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nodesize - sizeof(struct btrfs_header));
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nritems = 0;
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item_size = sizeof(*dev_item);
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itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) - item_size;
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/* first device 1 (there is no device 0) */
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
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btrfs_set_disk_key_offset(&disk_key, 1);
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btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
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dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
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btrfs_set_device_id(buf, dev_item, 1);
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btrfs_set_device_generation(buf, dev_item, 0);
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btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
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btrfs_set_device_bytes_used(buf, dev_item,
|
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BTRFS_MKFS_SYSTEM_GROUP_SIZE);
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btrfs_set_device_io_align(buf, dev_item, sectorsize);
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btrfs_set_device_io_width(buf, dev_item, sectorsize);
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btrfs_set_device_sector_size(buf, dev_item, sectorsize);
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btrfs_set_device_type(buf, dev_item, 0);
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write_extent_buffer(buf, super.dev_item.uuid,
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(unsigned long)btrfs_device_uuid(dev_item),
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BTRFS_UUID_SIZE);
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write_extent_buffer(buf, super.fsid,
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(unsigned long)btrfs_device_fsid(dev_item),
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BTRFS_UUID_SIZE);
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read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
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sizeof(*dev_item));
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nritems++;
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item_size = btrfs_chunk_item_size(1);
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itemoff = itemoff - item_size;
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|
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/* then we have chunk 0 */
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
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btrfs_set_disk_key_offset(&disk_key, 0);
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btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
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btrfs_set_item_key(buf, &disk_key, nritems);
|
|
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
|
|
btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
|
|
|
|
chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
|
|
btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
|
|
btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
|
|
btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
|
|
btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
|
|
btrfs_set_chunk_io_align(buf, chunk, sectorsize);
|
|
btrfs_set_chunk_io_width(buf, chunk, sectorsize);
|
|
btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
|
|
btrfs_set_chunk_num_stripes(buf, chunk, 1);
|
|
btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
|
|
btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
|
|
nritems++;
|
|
|
|
write_extent_buffer(buf, super.dev_item.uuid,
|
|
(unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
|
|
BTRFS_UUID_SIZE);
|
|
|
|
/* copy the key for the chunk to the system array */
|
|
ptr = super.sys_chunk_array;
|
|
array_size = sizeof(disk_key);
|
|
|
|
memcpy(ptr, &disk_key, sizeof(disk_key));
|
|
ptr += sizeof(disk_key);
|
|
|
|
/* copy the chunk to the system array */
|
|
read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
|
|
array_size += item_size;
|
|
ptr += item_size;
|
|
btrfs_set_super_sys_array_size(&super, array_size);
|
|
|
|
btrfs_set_header_bytenr(buf, blocks[3]);
|
|
btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
|
|
btrfs_set_header_nritems(buf, nritems);
|
|
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
|
|
ret = pwrite(fd, buf->data, nodesize, blocks[3]);
|
|
if (ret != nodesize) {
|
|
ret = (ret < 0 ? -errno : -EIO);
|
|
goto out;
|
|
}
|
|
|
|
/* create the device tree */
|
|
memset(buf->data + sizeof(struct btrfs_header), 0,
|
|
nodesize - sizeof(struct btrfs_header));
|
|
nritems = 0;
|
|
itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) -
|
|
sizeof(struct btrfs_dev_extent);
|
|
|
|
btrfs_set_disk_key_objectid(&disk_key, 1);
|
|
btrfs_set_disk_key_offset(&disk_key, 0);
|
|
btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
|
|
btrfs_set_item_key(buf, &disk_key, nritems);
|
|
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
|
|
btrfs_set_item_size(buf, btrfs_item_nr(nritems),
|
|
sizeof(struct btrfs_dev_extent));
|
|
dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
|
|
btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
|
|
BTRFS_CHUNK_TREE_OBJECTID);
|
|
btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
|
|
BTRFS_FIRST_CHUNK_TREE_OBJECTID);
|
|
btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
|
|
|
|
write_extent_buffer(buf, chunk_tree_uuid,
|
|
(unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
|
|
BTRFS_UUID_SIZE);
|
|
|
|
btrfs_set_dev_extent_length(buf, dev_extent,
|
|
BTRFS_MKFS_SYSTEM_GROUP_SIZE);
|
|
nritems++;
|
|
|
|
btrfs_set_header_bytenr(buf, blocks[4]);
|
|
btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
|
|
btrfs_set_header_nritems(buf, nritems);
|
|
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
|
|
ret = pwrite(fd, buf->data, nodesize, blocks[4]);
|
|
if (ret != nodesize) {
|
|
ret = (ret < 0 ? -errno : -EIO);
|
|
goto out;
|
|
}
|
|
|
|
/* create the FS root */
|
|
memset(buf->data + sizeof(struct btrfs_header), 0,
|
|
nodesize - sizeof(struct btrfs_header));
|
|
btrfs_set_header_bytenr(buf, blocks[5]);
|
|
btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
|
|
btrfs_set_header_nritems(buf, 0);
|
|
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
|
|
ret = pwrite(fd, buf->data, nodesize, blocks[5]);
|
|
if (ret != nodesize) {
|
|
ret = (ret < 0 ? -errno : -EIO);
|
|
goto out;
|
|
}
|
|
/* finally create the csum root */
|
|
memset(buf->data + sizeof(struct btrfs_header), 0,
|
|
nodesize - sizeof(struct btrfs_header));
|
|
btrfs_set_header_bytenr(buf, blocks[6]);
|
|
btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
|
|
btrfs_set_header_nritems(buf, 0);
|
|
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
|
|
ret = pwrite(fd, buf->data, nodesize, blocks[6]);
|
|
if (ret != nodesize) {
|
|
ret = (ret < 0 ? -errno : -EIO);
|
|
goto out;
|
|
}
|
|
|
|
/* and write out the super block */
|
|
BUG_ON(sizeof(super) > sectorsize);
|
|
memset(buf->data, 0, sectorsize);
|
|
memcpy(buf->data, &super, sizeof(super));
|
|
buf->len = sectorsize;
|
|
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
|
|
ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
|
|
if (ret != sectorsize) {
|
|
ret = (ret < 0 ? -errno : -EIO);
|
|
goto out;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
free(buf);
|
|
return ret;
|
|
}
|
|
|
|
static const struct btrfs_fs_feature {
|
|
const char *name;
|
|
u64 flag;
|
|
const char *desc;
|
|
} mkfs_features[] = {
|
|
{ "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
|
|
"mixed data and metadata block groups" },
|
|
{ "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
|
|
"increased hardlink limit per file to 65536" },
|
|
{ "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
|
|
"raid56 extended format" },
|
|
{ "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
|
|
"reduced-size metadata extent refs" },
|
|
{ "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
|
|
"no explicit hole extents for files" },
|
|
/* Keep this one last */
|
|
{ "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
|
|
};
|
|
|
|
static int parse_one_fs_feature(const char *name, u64 *flags)
|
|
{
|
|
int i;
|
|
int found = 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
|
|
if (name[0] == '^' &&
|
|
!strcmp(mkfs_features[i].name, name + 1)) {
|
|
*flags &= ~ mkfs_features[i].flag;
|
|
found = 1;
|
|
} else if (!strcmp(mkfs_features[i].name, name)) {
|
|
*flags |= mkfs_features[i].flag;
|
|
found = 1;
|
|
}
|
|
}
|
|
|
|
return !found;
|
|
}
|
|
|
|
void btrfs_process_fs_features(u64 flags)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
|
|
if (flags & mkfs_features[i].flag) {
|
|
printf("Turning ON incompat feature '%s': %s\n",
|
|
mkfs_features[i].name,
|
|
mkfs_features[i].desc);
|
|
}
|
|
}
|
|
}
|
|
|
|
void btrfs_list_all_fs_features(u64 mask_disallowed)
|
|
{
|
|
int i;
|
|
|
|
fprintf(stderr, "Filesystem features available:\n");
|
|
for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
|
|
char *is_default = "";
|
|
|
|
if (mkfs_features[i].flag & mask_disallowed)
|
|
continue;
|
|
if (mkfs_features[i].flag & BTRFS_MKFS_DEFAULT_FEATURES)
|
|
is_default = ", default";
|
|
fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
|
|
mkfs_features[i].name,
|
|
mkfs_features[i].desc,
|
|
mkfs_features[i].flag,
|
|
is_default);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return NULL if all features were parsed fine, otherwise return the name of
|
|
* the first unparsed.
|
|
*/
|
|
char* btrfs_parse_fs_features(char *namelist, u64 *flags)
|
|
{
|
|
char *this_char;
|
|
char *save_ptr = NULL; /* Satisfy static checkers */
|
|
|
|
for (this_char = strtok_r(namelist, ",", &save_ptr);
|
|
this_char != NULL;
|
|
this_char = strtok_r(NULL, ",", &save_ptr)) {
|
|
if (parse_one_fs_feature(this_char, flags))
|
|
return this_char;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
u64 btrfs_device_size(int fd, struct stat *st)
|
|
{
|
|
u64 size;
|
|
if (S_ISREG(st->st_mode)) {
|
|
return st->st_size;
|
|
}
|
|
if (!S_ISBLK(st->st_mode)) {
|
|
return 0;
|
|
}
|
|
if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
|
|
return size;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int zero_blocks(int fd, off_t start, size_t len)
|
|
{
|
|
char *buf = malloc(len);
|
|
int ret = 0;
|
|
ssize_t written;
|
|
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
memset(buf, 0, len);
|
|
written = pwrite(fd, buf, len, start);
|
|
if (written != len)
|
|
ret = -EIO;
|
|
free(buf);
|
|
return ret;
|
|
}
|
|
|
|
#define ZERO_DEV_BYTES (2 * 1024 * 1024)
|
|
|
|
/* don't write outside the device by clamping the region to the device size */
|
|
static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
|
|
{
|
|
off_t end = max(start, start + len);
|
|
|
|
#ifdef __sparc__
|
|
/* and don't overwrite the disk labels on sparc */
|
|
start = max(start, 1024);
|
|
end = max(end, 1024);
|
|
#endif
|
|
|
|
start = min_t(u64, start, dev_size);
|
|
end = min_t(u64, end, dev_size);
|
|
|
|
return zero_blocks(fd, start, end - start);
|
|
}
|
|
|
|
int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, int fd, char *path,
|
|
u64 block_count, u32 io_width, u32 io_align,
|
|
u32 sectorsize)
|
|
{
|
|
struct btrfs_super_block *disk_super;
|
|
struct btrfs_super_block *super = root->fs_info->super_copy;
|
|
struct btrfs_device *device;
|
|
struct btrfs_dev_item *dev_item;
|
|
char *buf;
|
|
u64 total_bytes;
|
|
u64 num_devs;
|
|
int ret;
|
|
|
|
device = kzalloc(sizeof(*device), GFP_NOFS);
|
|
if (!device)
|
|
return -ENOMEM;
|
|
buf = kmalloc(sectorsize, GFP_NOFS);
|
|
if (!buf) {
|
|
kfree(device);
|
|
return -ENOMEM;
|
|
}
|
|
BUG_ON(sizeof(*disk_super) > sectorsize);
|
|
memset(buf, 0, sectorsize);
|
|
|
|
disk_super = (struct btrfs_super_block *)buf;
|
|
dev_item = &disk_super->dev_item;
|
|
|
|
uuid_generate(device->uuid);
|
|
device->devid = 0;
|
|
device->type = 0;
|
|
device->io_width = io_width;
|
|
device->io_align = io_align;
|
|
device->sector_size = sectorsize;
|
|
device->fd = fd;
|
|
device->writeable = 1;
|
|
device->total_bytes = block_count;
|
|
device->bytes_used = 0;
|
|
device->total_ios = 0;
|
|
device->dev_root = root->fs_info->dev_root;
|
|
|
|
ret = btrfs_add_device(trans, root, device);
|
|
BUG_ON(ret);
|
|
|
|
total_bytes = btrfs_super_total_bytes(super) + block_count;
|
|
btrfs_set_super_total_bytes(super, total_bytes);
|
|
|
|
num_devs = btrfs_super_num_devices(super) + 1;
|
|
btrfs_set_super_num_devices(super, num_devs);
|
|
|
|
memcpy(disk_super, super, sizeof(*disk_super));
|
|
|
|
printf("adding device %s id %llu\n", path,
|
|
(unsigned long long)device->devid);
|
|
|
|
btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
|
|
btrfs_set_stack_device_id(dev_item, device->devid);
|
|
btrfs_set_stack_device_type(dev_item, device->type);
|
|
btrfs_set_stack_device_io_align(dev_item, device->io_align);
|
|
btrfs_set_stack_device_io_width(dev_item, device->io_width);
|
|
btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
|
|
btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
|
|
btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
|
|
memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
|
|
|
|
ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
|
|
BUG_ON(ret != sectorsize);
|
|
|
|
kfree(buf);
|
|
list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
|
|
device->fs_devices = root->fs_info->fs_devices;
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_wipe_existing_sb(int fd)
|
|
{
|
|
const char *off = NULL;
|
|
size_t len = 0;
|
|
loff_t offset;
|
|
char buf[BUFSIZ];
|
|
int rc = 0;
|
|
blkid_probe pr = NULL;
|
|
|
|
pr = blkid_new_probe();
|
|
if (!pr)
|
|
return;
|
|
|
|
if (blkid_probe_set_device(pr, fd, 0, 0))
|
|
goto out;
|
|
|
|
rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
|
|
if (!rc)
|
|
rc = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
|
|
|
|
if (rc || len == 0 || off == NULL)
|
|
goto out;
|
|
|
|
offset = strtoll(off, NULL, 10);
|
|
if (len > sizeof(buf))
|
|
len = sizeof(buf);
|
|
|
|
memset(buf, 0, len);
|
|
rc = pwrite(fd, buf, len, offset);
|
|
fsync(fd);
|
|
|
|
out:
|
|
blkid_free_probe(pr);
|
|
return;
|
|
}
|
|
|
|
int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
|
|
u64 max_block_count, int *mixed, int discard)
|
|
{
|
|
u64 block_count;
|
|
struct stat st;
|
|
int i, ret;
|
|
|
|
ret = fstat(fd, &st);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "unable to stat %s\n", file);
|
|
return 1;
|
|
}
|
|
|
|
block_count = btrfs_device_size(fd, &st);
|
|
if (block_count == 0) {
|
|
fprintf(stderr, "unable to find %s size\n", file);
|
|
return 1;
|
|
}
|
|
if (max_block_count)
|
|
block_count = min(block_count, max_block_count);
|
|
|
|
if (block_count < BTRFS_MKFS_SMALL_VOLUME_SIZE && !(*mixed))
|
|
*mixed = 1;
|
|
|
|
if (discard) {
|
|
/*
|
|
* We intentionally ignore errors from the discard ioctl. It
|
|
* is not necessary for the mkfs functionality but just an
|
|
* optimization.
|
|
*/
|
|
if (discard_range(fd, 0, 0) == 0) {
|
|
printf("Performing full device TRIM (%s) ...\n",
|
|
pretty_size(block_count));
|
|
discard_blocks(fd, 0, block_count);
|
|
}
|
|
}
|
|
|
|
ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
|
|
for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
|
|
ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
|
|
BTRFS_SUPER_INFO_SIZE, block_count);
|
|
if (!ret && zero_end)
|
|
ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
|
|
ZERO_DEV_BYTES, block_count);
|
|
|
|
if (ret < 0) {
|
|
fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
|
|
file, strerror(-ret));
|
|
return 1;
|
|
}
|
|
|
|
btrfs_wipe_existing_sb(fd);
|
|
|
|
*block_count_ret = block_count;
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 objectid)
|
|
{
|
|
int ret;
|
|
struct btrfs_inode_item inode_item;
|
|
time_t now = time(NULL);
|
|
|
|
memset(&inode_item, 0, sizeof(inode_item));
|
|
btrfs_set_stack_inode_generation(&inode_item, trans->transid);
|
|
btrfs_set_stack_inode_size(&inode_item, 0);
|
|
btrfs_set_stack_inode_nlink(&inode_item, 1);
|
|
btrfs_set_stack_inode_nbytes(&inode_item, root->nodesize);
|
|
btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
|
|
btrfs_set_stack_timespec_sec(&inode_item.atime, now);
|
|
btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
|
|
btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
|
|
btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
|
|
btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
|
|
btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
|
|
btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
|
|
btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
|
|
|
|
if (root->fs_info->tree_root == root)
|
|
btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
|
|
|
|
ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
|
|
if (ret)
|
|
goto error;
|
|
|
|
ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
|
|
if (ret)
|
|
goto error;
|
|
|
|
btrfs_set_root_dirid(&root->root_item, objectid);
|
|
ret = 0;
|
|
error:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* checks if a path is a block device node
|
|
* Returns negative errno on failure, otherwise
|
|
* returns 1 for blockdev, 0 for not-blockdev
|
|
*/
|
|
int is_block_device(const char *path)
|
|
{
|
|
struct stat statbuf;
|
|
|
|
if (stat(path, &statbuf) < 0)
|
|
return -errno;
|
|
|
|
return S_ISBLK(statbuf.st_mode);
|
|
}
|
|
|
|
/*
|
|
* check if given path is a mount point
|
|
* return 1 if yes. 0 if no. -1 for error
|
|
*/
|
|
int is_mount_point(const char *path)
|
|
{
|
|
FILE *f;
|
|
struct mntent *mnt;
|
|
int ret = 0;
|
|
|
|
f = setmntent("/proc/self/mounts", "r");
|
|
if (f == NULL)
|
|
return -1;
|
|
|
|
while ((mnt = getmntent(f)) != NULL) {
|
|
if (strcmp(mnt->mnt_dir, path))
|
|
continue;
|
|
ret = 1;
|
|
break;
|
|
}
|
|
endmntent(f);
|
|
return ret;
|
|
}
|
|
|
|
static int is_reg_file(const char *path)
|
|
{
|
|
struct stat statbuf;
|
|
|
|
if (stat(path, &statbuf) < 0)
|
|
return -errno;
|
|
return S_ISREG(statbuf.st_mode);
|
|
}
|
|
|
|
/*
|
|
* This function checks if the given input parameter is
|
|
* an uuid or a path
|
|
* return <0 : some error in the given input
|
|
* return BTRFS_ARG_UNKNOWN: unknown input
|
|
* return BTRFS_ARG_UUID: given input is uuid
|
|
* return BTRFS_ARG_MNTPOINT: given input is path
|
|
* return BTRFS_ARG_REG: given input is regular file
|
|
*/
|
|
int check_arg_type(const char *input)
|
|
{
|
|
uuid_t uuid;
|
|
char path[PATH_MAX];
|
|
|
|
if (!input)
|
|
return -EINVAL;
|
|
|
|
if (realpath(input, path)) {
|
|
if (is_block_device(path) == 1)
|
|
return BTRFS_ARG_BLKDEV;
|
|
|
|
if (is_mount_point(path) == 1)
|
|
return BTRFS_ARG_MNTPOINT;
|
|
|
|
if (is_reg_file(path))
|
|
return BTRFS_ARG_REG;
|
|
|
|
return BTRFS_ARG_UNKNOWN;
|
|
}
|
|
|
|
if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
|
|
!uuid_parse(input, uuid))
|
|
return BTRFS_ARG_UUID;
|
|
|
|
return BTRFS_ARG_UNKNOWN;
|
|
}
|
|
|
|
/*
|
|
* Find the mount point for a mounted device.
|
|
* On success, returns 0 with mountpoint in *mp.
|
|
* On failure, returns -errno (not mounted yields -EINVAL)
|
|
* Is noisy on failures, expects to be given a mounted device.
|
|
*/
|
|
int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
|
|
{
|
|
int ret;
|
|
int fd = -1;
|
|
|
|
ret = is_block_device(dev);
|
|
if (ret <= 0) {
|
|
if (!ret) {
|
|
fprintf(stderr, "%s is not a block device\n", dev);
|
|
ret = -EINVAL;
|
|
} else {
|
|
fprintf(stderr, "Could not check %s: %s\n",
|
|
dev, strerror(-ret));
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
fd = open(dev, O_RDONLY);
|
|
if (fd < 0) {
|
|
ret = -errno;
|
|
fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
|
|
goto out;
|
|
}
|
|
|
|
ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
|
|
if (!ret) {
|
|
ret = -EINVAL;
|
|
} else { /* mounted, all good */
|
|
ret = 0;
|
|
}
|
|
out:
|
|
if (fd != -1)
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Given a pathname, return a filehandle to:
|
|
* the original pathname or,
|
|
* if the pathname is a mounted btrfs device, to its mountpoint.
|
|
*
|
|
* On error, return -1, errno should be set.
|
|
*/
|
|
int open_path_or_dev_mnt(const char *path, DIR **dirstream)
|
|
{
|
|
char mp[BTRFS_PATH_NAME_MAX + 1];
|
|
int fdmnt;
|
|
|
|
if (is_block_device(path)) {
|
|
int ret;
|
|
|
|
ret = get_btrfs_mount(path, mp, sizeof(mp));
|
|
if (ret < 0) {
|
|
/* not a mounted btrfs dev */
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
fdmnt = open_file_or_dir(mp, dirstream);
|
|
} else {
|
|
fdmnt = open_file_or_dir(path, dirstream);
|
|
}
|
|
|
|
return fdmnt;
|
|
}
|
|
|
|
/* checks if a device is a loop device */
|
|
static int is_loop_device (const char* device) {
|
|
struct stat statbuf;
|
|
|
|
if(stat(device, &statbuf) < 0)
|
|
return -errno;
|
|
|
|
return (S_ISBLK(statbuf.st_mode) &&
|
|
MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
|
|
}
|
|
|
|
|
|
/* Takes a loop device path (e.g. /dev/loop0) and returns
|
|
* the associated file (e.g. /images/my_btrfs.img) */
|
|
static int resolve_loop_device(const char* loop_dev, char* loop_file,
|
|
int max_len)
|
|
{
|
|
int ret;
|
|
FILE *f;
|
|
char fmt[20];
|
|
char p[PATH_MAX];
|
|
char real_loop_dev[PATH_MAX];
|
|
|
|
if (!realpath(loop_dev, real_loop_dev))
|
|
return -errno;
|
|
snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
|
|
if (!(f = fopen(p, "r")))
|
|
return -errno;
|
|
|
|
snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
|
|
ret = fscanf(f, fmt, loop_file);
|
|
fclose(f);
|
|
if (ret == EOF)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Checks whether a and b are identical or device
|
|
* files associated with the same block device
|
|
*/
|
|
static int is_same_blk_file(const char* a, const char* b)
|
|
{
|
|
struct stat st_buf_a, st_buf_b;
|
|
char real_a[PATH_MAX];
|
|
char real_b[PATH_MAX];
|
|
|
|
if (!realpath(a, real_a))
|
|
strncpy_null(real_a, a);
|
|
|
|
if (!realpath(b, real_b))
|
|
strncpy_null(real_b, b);
|
|
|
|
/* Identical path? */
|
|
if (strcmp(real_a, real_b) == 0)
|
|
return 1;
|
|
|
|
if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
|
|
if (errno == ENOENT)
|
|
return 0;
|
|
return -errno;
|
|
}
|
|
|
|
/* Same blockdevice? */
|
|
if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
|
|
st_buf_a.st_rdev == st_buf_b.st_rdev) {
|
|
return 1;
|
|
}
|
|
|
|
/* Hardlink? */
|
|
if (st_buf_a.st_dev == st_buf_b.st_dev &&
|
|
st_buf_a.st_ino == st_buf_b.st_ino) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* checks if a and b are identical or device
|
|
* files associated with the same block device or
|
|
* if one file is a loop device that uses the other
|
|
* file.
|
|
*/
|
|
static int is_same_loop_file(const char* a, const char* b)
|
|
{
|
|
char res_a[PATH_MAX];
|
|
char res_b[PATH_MAX];
|
|
const char* final_a = NULL;
|
|
const char* final_b = NULL;
|
|
int ret;
|
|
|
|
/* Resolve a if it is a loop device */
|
|
if((ret = is_loop_device(a)) < 0) {
|
|
if (ret == -ENOENT)
|
|
return 0;
|
|
return ret;
|
|
} else if (ret) {
|
|
ret = resolve_loop_device(a, res_a, sizeof(res_a));
|
|
if (ret < 0) {
|
|
if (errno != EPERM)
|
|
return ret;
|
|
} else {
|
|
final_a = res_a;
|
|
}
|
|
} else {
|
|
final_a = a;
|
|
}
|
|
|
|
/* Resolve b if it is a loop device */
|
|
if ((ret = is_loop_device(b)) < 0) {
|
|
if (ret == -ENOENT)
|
|
return 0;
|
|
return ret;
|
|
} else if (ret) {
|
|
ret = resolve_loop_device(b, res_b, sizeof(res_b));
|
|
if (ret < 0) {
|
|
if (errno != EPERM)
|
|
return ret;
|
|
} else {
|
|
final_b = res_b;
|
|
}
|
|
} else {
|
|
final_b = b;
|
|
}
|
|
|
|
return is_same_blk_file(final_a, final_b);
|
|
}
|
|
|
|
/* Checks if a file exists and is a block or regular file*/
|
|
static int is_existing_blk_or_reg_file(const char* filename)
|
|
{
|
|
struct stat st_buf;
|
|
|
|
if(stat(filename, &st_buf) < 0) {
|
|
if(errno == ENOENT)
|
|
return 0;
|
|
else
|
|
return -errno;
|
|
}
|
|
|
|
return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
|
|
}
|
|
|
|
/* Checks if a file is used (directly or indirectly via a loop device)
|
|
* by a device in fs_devices
|
|
*/
|
|
static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
|
|
const char* file)
|
|
{
|
|
int ret;
|
|
struct list_head *head;
|
|
struct list_head *cur;
|
|
struct btrfs_device *device;
|
|
|
|
head = &fs_devices->devices;
|
|
list_for_each(cur, head) {
|
|
device = list_entry(cur, struct btrfs_device, dev_list);
|
|
|
|
if((ret = is_same_loop_file(device->name, file)))
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Resolve a pathname to a device mapper node to /dev/mapper/<name>
|
|
* Returns NULL on invalid input or malloc failure; Other failures
|
|
* will be handled by the caller using the input pathame.
|
|
*/
|
|
char *canonicalize_dm_name(const char *ptname)
|
|
{
|
|
FILE *f;
|
|
size_t sz;
|
|
char path[PATH_MAX], name[PATH_MAX], *res = NULL;
|
|
|
|
if (!ptname || !*ptname)
|
|
return NULL;
|
|
|
|
snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
|
|
if (!(f = fopen(path, "r")))
|
|
return NULL;
|
|
|
|
/* read <name>\n from sysfs */
|
|
if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
|
|
name[sz - 1] = '\0';
|
|
snprintf(path, sizeof(path), "/dev/mapper/%s", name);
|
|
|
|
if (access(path, F_OK) == 0)
|
|
res = strdup(path);
|
|
}
|
|
fclose(f);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
|
|
* to a device mapper pathname.
|
|
* Returns NULL on invalid input or malloc failure; Other failures
|
|
* will be handled by the caller using the input pathame.
|
|
*/
|
|
char *canonicalize_path(const char *path)
|
|
{
|
|
char *canonical, *p;
|
|
|
|
if (!path || !*path)
|
|
return NULL;
|
|
|
|
canonical = realpath(path, NULL);
|
|
if (!canonical)
|
|
return strdup(path);
|
|
p = strrchr(canonical, '/');
|
|
if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
|
|
char *dm = canonicalize_dm_name(p + 1);
|
|
|
|
if (dm) {
|
|
free(canonical);
|
|
return dm;
|
|
}
|
|
}
|
|
return canonical;
|
|
}
|
|
|
|
/*
|
|
* returns 1 if the device was mounted, < 0 on error or 0 if everything
|
|
* is safe to continue.
|
|
*/
|
|
int check_mounted(const char* file)
|
|
{
|
|
int fd;
|
|
int ret;
|
|
|
|
fd = open(file, O_RDONLY);
|
|
if (fd < 0) {
|
|
fprintf (stderr, "check_mounted(): Could not open %s\n", file);
|
|
return -errno;
|
|
}
|
|
|
|
ret = check_mounted_where(fd, file, NULL, 0, NULL);
|
|
close(fd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int check_mounted_where(int fd, const char *file, char *where, int size,
|
|
struct btrfs_fs_devices **fs_dev_ret)
|
|
{
|
|
int ret;
|
|
u64 total_devs = 1;
|
|
int is_btrfs;
|
|
struct btrfs_fs_devices *fs_devices_mnt = NULL;
|
|
FILE *f;
|
|
struct mntent *mnt;
|
|
|
|
/* scan the initial device */
|
|
ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
|
|
&total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
|
|
is_btrfs = (ret >= 0);
|
|
|
|
/* scan other devices */
|
|
if (is_btrfs && total_devs > 1) {
|
|
ret = btrfs_scan_lblkid();
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* iterate over the list of currently mountes filesystems */
|
|
if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
|
|
return -errno;
|
|
|
|
while ((mnt = getmntent (f)) != NULL) {
|
|
if(is_btrfs) {
|
|
if(strcmp(mnt->mnt_type, "btrfs") != 0)
|
|
continue;
|
|
|
|
ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
|
|
} else {
|
|
/* ignore entries in the mount table that are not
|
|
associated with a file*/
|
|
if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
|
|
goto out_mntloop_err;
|
|
else if(!ret)
|
|
continue;
|
|
|
|
ret = is_same_loop_file(file, mnt->mnt_fsname);
|
|
}
|
|
|
|
if(ret < 0)
|
|
goto out_mntloop_err;
|
|
else if(ret)
|
|
break;
|
|
}
|
|
|
|
/* Did we find an entry in mnt table? */
|
|
if (mnt && size && where) {
|
|
strncpy(where, mnt->mnt_dir, size);
|
|
where[size-1] = 0;
|
|
}
|
|
if (fs_dev_ret)
|
|
*fs_dev_ret = fs_devices_mnt;
|
|
|
|
ret = (mnt != NULL);
|
|
|
|
out_mntloop_err:
|
|
endmntent (f);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct pending_dir {
|
|
struct list_head list;
|
|
char name[PATH_MAX];
|
|
};
|
|
|
|
int btrfs_register_one_device(const char *fname)
|
|
{
|
|
struct btrfs_ioctl_vol_args args;
|
|
int fd;
|
|
int ret;
|
|
int e;
|
|
|
|
fd = open("/dev/btrfs-control", O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "failed to open /dev/btrfs-control "
|
|
"skipping device registration: %s\n",
|
|
strerror(errno));
|
|
return -errno;
|
|
}
|
|
strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
|
|
args.name[BTRFS_PATH_NAME_MAX-1] = 0;
|
|
ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
|
|
e = errno;
|
|
if (ret < 0) {
|
|
fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
|
|
fname, strerror(e));
|
|
ret = -e;
|
|
}
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Register all devices in the fs_uuid list created in the user
|
|
* space. Ensure btrfs_scan_lblkid() is called before this func.
|
|
*/
|
|
int btrfs_register_all_devices(void)
|
|
{
|
|
int err;
|
|
struct btrfs_fs_devices *fs_devices;
|
|
struct btrfs_device *device;
|
|
struct list_head *all_uuids;
|
|
|
|
all_uuids = btrfs_scanned_uuids();
|
|
|
|
list_for_each_entry(fs_devices, all_uuids, list) {
|
|
list_for_each_entry(device, &fs_devices->devices, dev_list) {
|
|
if (strlen(device->name) != 0) {
|
|
err = btrfs_register_one_device(device->name);
|
|
if (err < 0)
|
|
return err;
|
|
if (err > 0)
|
|
return -err;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
|
|
int super_offset)
|
|
{
|
|
struct btrfs_super_block *disk_super;
|
|
char *buf;
|
|
int ret = 0;
|
|
|
|
buf = malloc(BTRFS_SUPER_INFO_SIZE);
|
|
if (!buf) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
|
|
if (ret != BTRFS_SUPER_INFO_SIZE)
|
|
goto brelse;
|
|
|
|
ret = 0;
|
|
disk_super = (struct btrfs_super_block *)buf;
|
|
if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
|
|
goto brelse;
|
|
|
|
if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
|
|
BTRFS_FSID_SIZE))
|
|
ret = 1;
|
|
brelse:
|
|
free(buf);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static const char* unit_suffix_binary[] =
|
|
{ "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
|
|
static const char* unit_suffix_decimal[] =
|
|
{ "B", "kB", "MB", "GB", "TB", "PB", "EB"};
|
|
|
|
int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
|
|
{
|
|
int num_divs;
|
|
float fraction;
|
|
u64 base = 0;
|
|
int mult = 0;
|
|
const char** suffix = NULL;
|
|
u64 last_size;
|
|
|
|
if (str_size == 0)
|
|
return 0;
|
|
|
|
if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
|
|
snprintf(str, str_size, "%llu", size);
|
|
return 0;
|
|
}
|
|
|
|
if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
|
|
base = 1024;
|
|
mult = 1024;
|
|
suffix = unit_suffix_binary;
|
|
} else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
|
|
base = 1000;
|
|
mult = 1000;
|
|
suffix = unit_suffix_decimal;
|
|
}
|
|
|
|
/* Unknown mode */
|
|
if (!base) {
|
|
fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
|
|
unit_mode);
|
|
assert(0);
|
|
return -1;
|
|
}
|
|
|
|
num_divs = 0;
|
|
last_size = size;
|
|
switch (unit_mode & UNITS_MODE_MASK) {
|
|
case UNITS_TBYTES: base *= mult; num_divs++;
|
|
case UNITS_GBYTES: base *= mult; num_divs++;
|
|
case UNITS_MBYTES: base *= mult; num_divs++;
|
|
case UNITS_KBYTES: num_divs++;
|
|
break;
|
|
case UNITS_BYTES:
|
|
base = 1;
|
|
num_divs = 0;
|
|
break;
|
|
default:
|
|
while (size >= mult) {
|
|
last_size = size;
|
|
size /= mult;
|
|
num_divs++;
|
|
}
|
|
}
|
|
|
|
if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
|
|
str[0] = '\0';
|
|
printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
|
|
num_divs);
|
|
assert(0);
|
|
return -1;
|
|
}
|
|
fraction = (float)last_size / base;
|
|
|
|
return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
|
|
}
|
|
|
|
/*
|
|
* __strncpy__null - strncpy with null termination
|
|
* @dest: the target array
|
|
* @src: the source string
|
|
* @n: maximum bytes to copy (size of *dest)
|
|
*
|
|
* Like strncpy, but ensures destination is null-terminated.
|
|
*
|
|
* Copies the string pointed to by src, including the terminating null
|
|
* byte ('\0'), to the buffer pointed to by dest, up to a maximum
|
|
* of n bytes. Then ensure that dest is null-terminated.
|
|
*/
|
|
char *__strncpy__null(char *dest, const char *src, size_t n)
|
|
{
|
|
strncpy(dest, src, n);
|
|
if (n > 0)
|
|
dest[n - 1] = '\0';
|
|
return dest;
|
|
}
|
|
|
|
/*
|
|
* Checks to make sure that the label matches our requirements.
|
|
* Returns:
|
|
0 if everything is safe and usable
|
|
-1 if the label is too long
|
|
*/
|
|
static int check_label(const char *input)
|
|
{
|
|
int len = strlen(input);
|
|
|
|
if (len > BTRFS_LABEL_SIZE - 1) {
|
|
fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
|
|
input, BTRFS_LABEL_SIZE - 1);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_label_unmounted(const char *dev, const char *label)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root;
|
|
int ret;
|
|
|
|
ret = check_mounted(dev);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
|
|
return -1;
|
|
}
|
|
if (ret > 0) {
|
|
fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
|
|
dev);
|
|
return -1;
|
|
}
|
|
|
|
/* Open the super_block at the default location
|
|
* and as read-write.
|
|
*/
|
|
root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
|
|
if (!root) /* errors are printed by open_ctree() */
|
|
return -1;
|
|
|
|
trans = btrfs_start_transaction(root, 1);
|
|
snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
|
|
label);
|
|
btrfs_commit_transaction(trans, root);
|
|
|
|
/* Now we close it since we are done. */
|
|
close_ctree(root);
|
|
return 0;
|
|
}
|
|
|
|
static int set_label_mounted(const char *mount_path, const char *label)
|
|
{
|
|
int fd;
|
|
|
|
fd = open(mount_path, O_RDONLY | O_NOATIME);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
|
|
return -1;
|
|
}
|
|
|
|
if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
|
|
fprintf(stderr, "ERROR: unable to set label %s\n",
|
|
strerror(errno));
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
static int get_label_unmounted(const char *dev, char *label)
|
|
{
|
|
struct btrfs_root *root;
|
|
int ret;
|
|
|
|
ret = check_mounted(dev);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
|
|
return -1;
|
|
}
|
|
if (ret > 0) {
|
|
fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
|
|
dev);
|
|
return -1;
|
|
}
|
|
|
|
/* Open the super_block at the default location
|
|
* and as read-only.
|
|
*/
|
|
root = open_ctree(dev, 0, 0);
|
|
if(!root)
|
|
return -1;
|
|
|
|
memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
|
|
|
|
/* Now we close it since we are done. */
|
|
close_ctree(root);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If a partition is mounted, try to get the filesystem label via its
|
|
* mounted path rather than device. Return the corresponding error
|
|
* the user specified the device path.
|
|
*/
|
|
int get_label_mounted(const char *mount_path, char *labelp)
|
|
{
|
|
char label[BTRFS_LABEL_SIZE];
|
|
int fd;
|
|
|
|
fd = open(mount_path, O_RDONLY | O_NOATIME);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
|
|
return -1;
|
|
}
|
|
|
|
memset(label, '\0', sizeof(label));
|
|
if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
|
|
fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
strncpy(labelp, label, sizeof(label));
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
int get_label(const char *btrfs_dev, char *label)
|
|
{
|
|
int ret;
|
|
|
|
ret = is_existing_blk_or_reg_file(btrfs_dev);
|
|
if (!ret)
|
|
ret = get_label_mounted(btrfs_dev, label);
|
|
else if (ret > 0)
|
|
ret = get_label_unmounted(btrfs_dev, label);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int set_label(const char *btrfs_dev, const char *label)
|
|
{
|
|
int ret;
|
|
|
|
if (check_label(label))
|
|
return -1;
|
|
|
|
ret = is_existing_blk_or_reg_file(btrfs_dev);
|
|
if (!ret)
|
|
ret = set_label_mounted(btrfs_dev, label);
|
|
else if (ret > 0)
|
|
ret = set_label_unmounted(btrfs_dev, label);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Unsafe subvolume check.
|
|
*
|
|
* This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
|
|
* btrfs mount point.
|
|
* Must use together with other reliable method like btrfs ioctl.
|
|
*/
|
|
static int __is_subvol(const char *path)
|
|
{
|
|
struct stat st;
|
|
int ret;
|
|
|
|
ret = lstat(path, &st);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return st.st_ino == BTRFS_FIRST_FREE_OBJECTID;
|
|
}
|
|
|
|
/*
|
|
* A not-so-good version fls64. No fascinating optimization since
|
|
* no one except parse_size use it
|
|
*/
|
|
static int fls64(u64 x)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i <64; i++)
|
|
if (x << i & (1ULL << 63))
|
|
return 64 - i;
|
|
return 64 - i;
|
|
}
|
|
|
|
u64 parse_size(char *s)
|
|
{
|
|
char c;
|
|
char *endptr;
|
|
u64 mult = 1;
|
|
u64 ret;
|
|
|
|
if (!s) {
|
|
fprintf(stderr, "ERROR: Size value is empty\n");
|
|
exit(1);
|
|
}
|
|
if (s[0] == '-') {
|
|
fprintf(stderr,
|
|
"ERROR: Size value '%s' is less equal than 0\n", s);
|
|
exit(1);
|
|
}
|
|
ret = strtoull(s, &endptr, 10);
|
|
if (endptr == s) {
|
|
fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
|
|
exit(1);
|
|
}
|
|
if (endptr[0] && endptr[1]) {
|
|
fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
|
|
endptr[1]);
|
|
exit(1);
|
|
}
|
|
/*
|
|
* strtoll returns LLONG_MAX when overflow, if this happens,
|
|
* need to call strtoull to get the real size
|
|
*/
|
|
if (errno == ERANGE && ret == ULLONG_MAX) {
|
|
fprintf(stderr,
|
|
"ERROR: Size value '%s' is too large for u64\n", s);
|
|
exit(1);
|
|
}
|
|
if (endptr[0]) {
|
|
c = tolower(endptr[0]);
|
|
switch (c) {
|
|
case 'e':
|
|
mult *= 1024;
|
|
/* fallthrough */
|
|
case 'p':
|
|
mult *= 1024;
|
|
/* fallthrough */
|
|
case 't':
|
|
mult *= 1024;
|
|
/* fallthrough */
|
|
case 'g':
|
|
mult *= 1024;
|
|
/* fallthrough */
|
|
case 'm':
|
|
mult *= 1024;
|
|
/* fallthrough */
|
|
case 'k':
|
|
mult *= 1024;
|
|
/* fallthrough */
|
|
case 'b':
|
|
break;
|
|
default:
|
|
fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
|
|
c);
|
|
exit(1);
|
|
}
|
|
}
|
|
/* Check whether ret * mult overflow */
|
|
if (fls64(ret) + fls64(mult) - 1 > 64) {
|
|
fprintf(stderr,
|
|
"ERROR: Size value '%s' is too large for u64\n", s);
|
|
exit(1);
|
|
}
|
|
ret *= mult;
|
|
return ret;
|
|
}
|
|
|
|
u64 parse_qgroupid(const char *p)
|
|
{
|
|
char *s = strchr(p, '/');
|
|
const char *ptr_src_end = p + strlen(p);
|
|
char *ptr_parse_end = NULL;
|
|
u64 level;
|
|
u64 id;
|
|
int fd;
|
|
int ret = 0;
|
|
|
|
if (p[0] == '/')
|
|
goto path;
|
|
|
|
/* Numeric format like '0/257' is the primary case */
|
|
if (!s) {
|
|
id = strtoull(p, &ptr_parse_end, 10);
|
|
if (ptr_parse_end != ptr_src_end)
|
|
goto path;
|
|
return id;
|
|
}
|
|
level = strtoull(p, &ptr_parse_end, 10);
|
|
if (ptr_parse_end != s)
|
|
goto path;
|
|
|
|
id = strtoull(s + 1, &ptr_parse_end, 10);
|
|
if (ptr_parse_end != ptr_src_end)
|
|
goto path;
|
|
|
|
return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
|
|
|
|
path:
|
|
/* Path format like subv at 'my_subvol' is the fallback case */
|
|
ret = __is_subvol(p);
|
|
if (ret < 0 || !ret)
|
|
goto err;
|
|
fd = open(p, O_RDONLY);
|
|
if (fd < 0)
|
|
goto err;
|
|
ret = lookup_ino_rootid(fd, &id);
|
|
close(fd);
|
|
if (ret < 0)
|
|
goto err;
|
|
return id;
|
|
|
|
err:
|
|
fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
|
|
exit(-1);
|
|
}
|
|
|
|
int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
|
|
{
|
|
int ret;
|
|
struct stat st;
|
|
int fd;
|
|
|
|
ret = stat(fname, &st);
|
|
if (ret < 0) {
|
|
return -1;
|
|
}
|
|
if (S_ISDIR(st.st_mode)) {
|
|
*dirstream = opendir(fname);
|
|
if (!*dirstream)
|
|
return -1;
|
|
fd = dirfd(*dirstream);
|
|
} else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
|
|
fd = open(fname, open_flags);
|
|
} else {
|
|
/*
|
|
* we set this on purpose, in case the caller output
|
|
* strerror(errno) as success
|
|
*/
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
if (fd < 0) {
|
|
fd = -1;
|
|
if (*dirstream)
|
|
closedir(*dirstream);
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
int open_file_or_dir(const char *fname, DIR **dirstream)
|
|
{
|
|
return open_file_or_dir3(fname, dirstream, O_RDWR);
|
|
}
|
|
|
|
void close_file_or_dir(int fd, DIR *dirstream)
|
|
{
|
|
if (dirstream)
|
|
closedir(dirstream);
|
|
else if (fd >= 0)
|
|
close(fd);
|
|
}
|
|
|
|
int get_device_info(int fd, u64 devid,
|
|
struct btrfs_ioctl_dev_info_args *di_args)
|
|
{
|
|
int ret;
|
|
|
|
di_args->devid = devid;
|
|
memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
|
|
|
|
ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
|
|
return ret ? -errno : 0;
|
|
}
|
|
|
|
static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
|
|
int nr_items)
|
|
{
|
|
struct btrfs_dev_item *dev_item;
|
|
char *buf = search_args->buf;
|
|
|
|
buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
|
|
+ sizeof(struct btrfs_dev_item));
|
|
buf += sizeof(struct btrfs_ioctl_search_header);
|
|
|
|
dev_item = (struct btrfs_dev_item *)buf;
|
|
|
|
return btrfs_stack_device_id(dev_item);
|
|
}
|
|
|
|
static int search_chunk_tree_for_fs_info(int fd,
|
|
struct btrfs_ioctl_fs_info_args *fi_args)
|
|
{
|
|
int ret;
|
|
int max_items;
|
|
u64 start_devid = 1;
|
|
struct btrfs_ioctl_search_args search_args;
|
|
struct btrfs_ioctl_search_key *search_key = &search_args.key;
|
|
|
|
fi_args->num_devices = 0;
|
|
|
|
max_items = BTRFS_SEARCH_ARGS_BUFSIZE
|
|
/ (sizeof(struct btrfs_ioctl_search_header)
|
|
+ sizeof(struct btrfs_dev_item));
|
|
|
|
search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
|
|
search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
|
|
search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
|
|
search_key->min_type = BTRFS_DEV_ITEM_KEY;
|
|
search_key->max_type = BTRFS_DEV_ITEM_KEY;
|
|
search_key->min_transid = 0;
|
|
search_key->max_transid = (u64)-1;
|
|
search_key->nr_items = max_items;
|
|
search_key->max_offset = (u64)-1;
|
|
|
|
again:
|
|
search_key->min_offset = start_devid;
|
|
|
|
ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
|
|
if (ret < 0)
|
|
return -errno;
|
|
|
|
fi_args->num_devices += (u64)search_key->nr_items;
|
|
|
|
if (search_key->nr_items == max_items) {
|
|
start_devid = find_max_device_id(&search_args,
|
|
search_key->nr_items) + 1;
|
|
goto again;
|
|
}
|
|
|
|
/* get the lastest max_id to stay consistent with the num_devices */
|
|
if (search_key->nr_items == 0)
|
|
/*
|
|
* last tree_search returns an empty buf, use the devid of
|
|
* the last dev_item of the previous tree_search
|
|
*/
|
|
fi_args->max_id = start_devid - 1;
|
|
else
|
|
fi_args->max_id = find_max_device_id(&search_args,
|
|
search_key->nr_items);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* For a given path, fill in the ioctl fs_ and info_ args.
|
|
* If the path is a btrfs mountpoint, fill info for all devices.
|
|
* If the path is a btrfs device, fill in only that device.
|
|
*
|
|
* The path provided must be either on a mounted btrfs fs,
|
|
* or be a mounted btrfs device.
|
|
*
|
|
* Returns 0 on success, or a negative errno.
|
|
*/
|
|
int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
|
|
struct btrfs_ioctl_dev_info_args **di_ret)
|
|
{
|
|
int fd = -1;
|
|
int ret = 0;
|
|
int ndevs = 0;
|
|
int i = 0;
|
|
int replacing = 0;
|
|
struct btrfs_fs_devices *fs_devices_mnt = NULL;
|
|
struct btrfs_ioctl_dev_info_args *di_args;
|
|
struct btrfs_ioctl_dev_info_args tmp;
|
|
char mp[BTRFS_PATH_NAME_MAX + 1];
|
|
DIR *dirstream = NULL;
|
|
|
|
memset(fi_args, 0, sizeof(*fi_args));
|
|
|
|
if (is_block_device(path)) {
|
|
struct btrfs_super_block *disk_super;
|
|
char buf[BTRFS_SUPER_INFO_SIZE];
|
|
u64 devid;
|
|
|
|
/* Ensure it's mounted, then set path to the mountpoint */
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0) {
|
|
ret = -errno;
|
|
fprintf(stderr, "Couldn't open %s: %s\n",
|
|
path, strerror(errno));
|
|
goto out;
|
|
}
|
|
ret = check_mounted_where(fd, path, mp, sizeof(mp),
|
|
&fs_devices_mnt);
|
|
if (!ret) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
path = mp;
|
|
/* Only fill in this one device */
|
|
fi_args->num_devices = 1;
|
|
|
|
disk_super = (struct btrfs_super_block *)buf;
|
|
ret = btrfs_read_dev_super(fd, disk_super,
|
|
BTRFS_SUPER_INFO_OFFSET, 0);
|
|
if (ret < 0) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
devid = btrfs_stack_device_id(&disk_super->dev_item);
|
|
|
|
fi_args->max_id = devid;
|
|
i = devid;
|
|
|
|
memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
|
|
close(fd);
|
|
}
|
|
|
|
/* at this point path must not be for a block device */
|
|
fd = open_file_or_dir(path, &dirstream);
|
|
if (fd < 0) {
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
|
|
/* fill in fi_args if not just a single device */
|
|
if (fi_args->num_devices != 1) {
|
|
ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
|
|
if (ret < 0) {
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The fs_args->num_devices does not include seed devices
|
|
*/
|
|
ret = search_chunk_tree_for_fs_info(fd, fi_args);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* search_chunk_tree_for_fs_info() will lacks the devid 0
|
|
* so manual probe for it here.
|
|
*/
|
|
ret = get_device_info(fd, 0, &tmp);
|
|
if (!ret) {
|
|
fi_args->num_devices++;
|
|
ndevs++;
|
|
replacing = 1;
|
|
if (i == 0)
|
|
i++;
|
|
}
|
|
}
|
|
|
|
if (!fi_args->num_devices)
|
|
goto out;
|
|
|
|
di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
|
|
if (!di_args) {
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
|
|
if (replacing)
|
|
memcpy(di_args, &tmp, sizeof(tmp));
|
|
for (; i <= fi_args->max_id; ++i) {
|
|
ret = get_device_info(fd, i, &di_args[ndevs]);
|
|
if (ret == -ENODEV)
|
|
continue;
|
|
if (ret)
|
|
goto out;
|
|
ndevs++;
|
|
}
|
|
|
|
/*
|
|
* only when the only dev we wanted to find is not there then
|
|
* let any error be returned
|
|
*/
|
|
if (fi_args->num_devices != 1) {
|
|
BUG_ON(ndevs == 0);
|
|
ret = 0;
|
|
}
|
|
|
|
out:
|
|
close_file_or_dir(fd, dirstream);
|
|
return ret;
|
|
}
|
|
|
|
#define isoctal(c) (((c) & ~7) == '0')
|
|
|
|
static inline void translate(char *f, char *t)
|
|
{
|
|
while (*f != '\0') {
|
|
if (*f == '\\' &&
|
|
isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
|
|
*t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
|
|
f += 4;
|
|
} else
|
|
*t++ = *f++;
|
|
}
|
|
*t = '\0';
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Checks if the swap device.
|
|
* Returns 1 if swap device, < 0 on error or 0 if not swap device.
|
|
*/
|
|
static int is_swap_device(const char *file)
|
|
{
|
|
FILE *f;
|
|
struct stat st_buf;
|
|
dev_t dev;
|
|
ino_t ino = 0;
|
|
char tmp[PATH_MAX];
|
|
char buf[PATH_MAX];
|
|
char *cp;
|
|
int ret = 0;
|
|
|
|
if (stat(file, &st_buf) < 0)
|
|
return -errno;
|
|
if (S_ISBLK(st_buf.st_mode))
|
|
dev = st_buf.st_rdev;
|
|
else if (S_ISREG(st_buf.st_mode)) {
|
|
dev = st_buf.st_dev;
|
|
ino = st_buf.st_ino;
|
|
} else
|
|
return 0;
|
|
|
|
if ((f = fopen("/proc/swaps", "r")) == NULL)
|
|
return 0;
|
|
|
|
/* skip the first line */
|
|
if (fgets(tmp, sizeof(tmp), f) == NULL)
|
|
goto out;
|
|
|
|
while (fgets(tmp, sizeof(tmp), f) != NULL) {
|
|
if ((cp = strchr(tmp, ' ')) != NULL)
|
|
*cp = '\0';
|
|
if ((cp = strchr(tmp, '\t')) != NULL)
|
|
*cp = '\0';
|
|
translate(tmp, buf);
|
|
if (stat(buf, &st_buf) != 0)
|
|
continue;
|
|
if (S_ISBLK(st_buf.st_mode)) {
|
|
if (dev == st_buf.st_rdev) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
} else if (S_ISREG(st_buf.st_mode)) {
|
|
if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
fclose(f);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check for existing filesystem or partition table on device.
|
|
* Returns:
|
|
* 1 for existing fs or partition
|
|
* 0 for nothing found
|
|
* -1 for internal error
|
|
*/
|
|
static int
|
|
check_overwrite(
|
|
char *device)
|
|
{
|
|
const char *type;
|
|
blkid_probe pr = NULL;
|
|
int ret;
|
|
blkid_loff_t size;
|
|
|
|
if (!device || !*device)
|
|
return 0;
|
|
|
|
ret = -1; /* will reset on success of all setup calls */
|
|
|
|
pr = blkid_new_probe_from_filename(device);
|
|
if (!pr)
|
|
goto out;
|
|
|
|
size = blkid_probe_get_size(pr);
|
|
if (size < 0)
|
|
goto out;
|
|
|
|
/* nothing to overwrite on a 0-length device */
|
|
if (size == 0) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
ret = blkid_probe_enable_partitions(pr, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = blkid_do_fullprobe(pr);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Blkid returns 1 for nothing found and 0 when it finds a signature,
|
|
* but we want the exact opposite, so reverse the return value here.
|
|
*
|
|
* In addition print some useful diagnostics about what actually is
|
|
* on the device.
|
|
*/
|
|
if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
|
|
fprintf(stderr,
|
|
"%s appears to contain an existing "
|
|
"filesystem (%s).\n", device, type);
|
|
} else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
|
|
fprintf(stderr,
|
|
"%s appears to contain a partition "
|
|
"table (%s).\n", device, type);
|
|
} else {
|
|
fprintf(stderr,
|
|
"%s appears to contain something weird "
|
|
"according to blkid\n", device);
|
|
}
|
|
ret = 1;
|
|
|
|
out:
|
|
if (pr)
|
|
blkid_free_probe(pr);
|
|
if (ret == -1)
|
|
fprintf(stderr,
|
|
"probe of %s failed, cannot detect "
|
|
"existing filesystem.\n", device);
|
|
return ret;
|
|
}
|
|
|
|
static int group_profile_devs_min(u64 flag)
|
|
{
|
|
switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
|
|
case 0: /* single */
|
|
case BTRFS_BLOCK_GROUP_DUP:
|
|
return 1;
|
|
case BTRFS_BLOCK_GROUP_RAID0:
|
|
case BTRFS_BLOCK_GROUP_RAID1:
|
|
case BTRFS_BLOCK_GROUP_RAID5:
|
|
return 2;
|
|
case BTRFS_BLOCK_GROUP_RAID6:
|
|
return 3;
|
|
case BTRFS_BLOCK_GROUP_RAID10:
|
|
return 4;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
|
|
u64 dev_cnt, int mixed, char *estr)
|
|
{
|
|
size_t sz = 100;
|
|
u64 allowed = 0;
|
|
|
|
switch (dev_cnt) {
|
|
default:
|
|
case 4:
|
|
allowed |= BTRFS_BLOCK_GROUP_RAID10;
|
|
case 3:
|
|
allowed |= BTRFS_BLOCK_GROUP_RAID6;
|
|
case 2:
|
|
allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
|
|
BTRFS_BLOCK_GROUP_RAID5;
|
|
break;
|
|
case 1:
|
|
allowed |= BTRFS_BLOCK_GROUP_DUP;
|
|
}
|
|
|
|
if (dev_cnt > 1 &&
|
|
((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
|
|
snprintf(estr, sz,
|
|
"DUP is not allowed when FS has multiple devices\n");
|
|
return 1;
|
|
}
|
|
if (metadata_profile & ~allowed) {
|
|
snprintf(estr, sz,
|
|
"unable to create FS with metadata profile %s "
|
|
"(have %llu devices but %d devices are required)\n",
|
|
btrfs_group_profile_str(metadata_profile), dev_cnt,
|
|
group_profile_devs_min(metadata_profile));
|
|
return 1;
|
|
}
|
|
if (data_profile & ~allowed) {
|
|
snprintf(estr, sz,
|
|
"unable to create FS with data profile %s "
|
|
"(have %llu devices but %d devices are required)\n",
|
|
btrfs_group_profile_str(data_profile), dev_cnt,
|
|
group_profile_devs_min(data_profile));
|
|
return 1;
|
|
}
|
|
|
|
if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
|
|
snprintf(estr, sz,
|
|
"dup for data is allowed only in mixed mode");
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Check if disk is suitable for btrfs
|
|
* returns:
|
|
* 1: something is wrong, estr provides the error
|
|
* 0: all is fine
|
|
*/
|
|
int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
|
|
{
|
|
int ret, fd;
|
|
size_t sz = 100;
|
|
struct stat st;
|
|
|
|
ret = is_swap_device(file);
|
|
if (ret < 0) {
|
|
snprintf(estr, sz, "error checking %s status: %s\n", file,
|
|
strerror(-ret));
|
|
return 1;
|
|
}
|
|
if (ret == 1) {
|
|
snprintf(estr, sz, "%s is a swap device\n", file);
|
|
return 1;
|
|
}
|
|
if (!force_overwrite) {
|
|
if (check_overwrite(file)) {
|
|
snprintf(estr, sz, "Use the -f option to force overwrite.\n");
|
|
return 1;
|
|
}
|
|
}
|
|
ret = check_mounted(file);
|
|
if (ret < 0) {
|
|
snprintf(estr, sz, "error checking %s mount status\n",
|
|
file);
|
|
return 1;
|
|
}
|
|
if (ret == 1) {
|
|
snprintf(estr, sz, "%s is mounted\n", file);
|
|
return 1;
|
|
}
|
|
/* check if the device is busy */
|
|
fd = open(file, O_RDWR|O_EXCL);
|
|
if (fd < 0) {
|
|
snprintf(estr, sz, "unable to open %s: %s\n", file,
|
|
strerror(errno));
|
|
return 1;
|
|
}
|
|
if (fstat(fd, &st)) {
|
|
snprintf(estr, sz, "unable to stat %s: %s\n", file,
|
|
strerror(errno));
|
|
close(fd);
|
|
return 1;
|
|
}
|
|
if (!S_ISBLK(st.st_mode)) {
|
|
fprintf(stderr, "'%s' is not a block device\n", file);
|
|
close(fd);
|
|
return 1;
|
|
}
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_scan_lblkid()
|
|
{
|
|
int fd = -1;
|
|
int ret;
|
|
u64 num_devices;
|
|
struct btrfs_fs_devices *tmp_devices;
|
|
blkid_dev_iterate iter = NULL;
|
|
blkid_dev dev = NULL;
|
|
blkid_cache cache = NULL;
|
|
char path[PATH_MAX];
|
|
|
|
if (btrfs_scan_done)
|
|
return 0;
|
|
|
|
if (blkid_get_cache(&cache, 0) < 0) {
|
|
printf("ERROR: lblkid cache get failed\n");
|
|
return 1;
|
|
}
|
|
blkid_probe_all(cache);
|
|
iter = blkid_dev_iterate_begin(cache);
|
|
blkid_dev_set_search(iter, "TYPE", "btrfs");
|
|
while (blkid_dev_next(iter, &dev) == 0) {
|
|
dev = blkid_verify(cache, dev);
|
|
if (!dev)
|
|
continue;
|
|
/* if we are here its definitely a btrfs disk*/
|
|
strncpy_null(path, blkid_dev_devname(dev));
|
|
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0) {
|
|
printf("ERROR: could not open %s\n", path);
|
|
continue;
|
|
}
|
|
ret = btrfs_scan_one_device(fd, path, &tmp_devices,
|
|
&num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
|
|
if (ret) {
|
|
printf("ERROR: could not scan %s\n", path);
|
|
close (fd);
|
|
continue;
|
|
}
|
|
|
|
close(fd);
|
|
}
|
|
blkid_dev_iterate_end(iter);
|
|
blkid_put_cache(cache);
|
|
|
|
btrfs_scan_done = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int is_vol_small(char *file)
|
|
{
|
|
int fd = -1;
|
|
int e;
|
|
struct stat st;
|
|
u64 size;
|
|
|
|
fd = open(file, O_RDONLY);
|
|
if (fd < 0)
|
|
return -errno;
|
|
if (fstat(fd, &st) < 0) {
|
|
e = -errno;
|
|
close(fd);
|
|
return e;
|
|
}
|
|
size = btrfs_device_size(fd, &st);
|
|
if (size == 0) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
|
|
close(fd);
|
|
return 1;
|
|
} else {
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This reads a line from the stdin and only returns non-zero if the
|
|
* first whitespace delimited token is a case insensitive match with yes
|
|
* or y.
|
|
*/
|
|
int ask_user(char *question)
|
|
{
|
|
char buf[30] = {0,};
|
|
char *saveptr = NULL;
|
|
char *answer;
|
|
|
|
printf("%s [y/N]: ", question);
|
|
|
|
return fgets(buf, sizeof(buf) - 1, stdin) &&
|
|
(answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
|
|
(!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
|
|
}
|
|
|
|
/*
|
|
* For a given:
|
|
* - file or directory return the containing tree root id
|
|
* - subvolume return its own tree id
|
|
* - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
|
|
* undefined and function returns -1
|
|
*/
|
|
int lookup_ino_rootid(int fd, u64 *rootid)
|
|
{
|
|
struct btrfs_ioctl_ino_lookup_args args;
|
|
int ret;
|
|
int e;
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
args.treeid = 0;
|
|
args.objectid = BTRFS_FIRST_FREE_OBJECTID;
|
|
|
|
ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
|
|
e = errno;
|
|
if (ret) {
|
|
fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
|
|
strerror(e));
|
|
return ret;
|
|
}
|
|
|
|
*rootid = args.treeid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* return 0 if a btrfs mount point is found
|
|
* return 1 if a mount point is found but not btrfs
|
|
* return <0 if something goes wrong
|
|
*/
|
|
int find_mount_root(const char *path, char **mount_root)
|
|
{
|
|
FILE *mnttab;
|
|
int fd;
|
|
struct mntent *ent;
|
|
int len;
|
|
int ret;
|
|
int not_btrfs = 1;
|
|
int longest_matchlen = 0;
|
|
char *longest_match = NULL;
|
|
|
|
fd = open(path, O_RDONLY | O_NOATIME);
|
|
if (fd < 0)
|
|
return -errno;
|
|
close(fd);
|
|
|
|
mnttab = setmntent("/proc/self/mounts", "r");
|
|
if (!mnttab)
|
|
return -errno;
|
|
|
|
while ((ent = getmntent(mnttab))) {
|
|
len = strlen(ent->mnt_dir);
|
|
if (strncmp(ent->mnt_dir, path, len) == 0) {
|
|
/* match found and use the latest match */
|
|
if (longest_matchlen <= len) {
|
|
free(longest_match);
|
|
longest_matchlen = len;
|
|
longest_match = strdup(ent->mnt_dir);
|
|
not_btrfs = strcmp(ent->mnt_type, "btrfs");
|
|
}
|
|
}
|
|
}
|
|
endmntent(mnttab);
|
|
|
|
if (!longest_match)
|
|
return -ENOENT;
|
|
if (not_btrfs) {
|
|
free(longest_match);
|
|
return 1;
|
|
}
|
|
|
|
ret = 0;
|
|
*mount_root = realpath(longest_match, NULL);
|
|
if (!*mount_root)
|
|
ret = -errno;
|
|
|
|
free(longest_match);
|
|
return ret;
|
|
}
|
|
|
|
int test_minimum_size(const char *file, u32 nodesize)
|
|
{
|
|
int fd;
|
|
struct stat statbuf;
|
|
|
|
fd = open(file, O_RDONLY);
|
|
if (fd < 0)
|
|
return -errno;
|
|
if (stat(file, &statbuf) < 0) {
|
|
close(fd);
|
|
return -errno;
|
|
}
|
|
if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
|
|
close(fd);
|
|
return 1;
|
|
}
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* test if name is a correct subvolume name
|
|
* this function return
|
|
* 0-> name is not a correct subvolume name
|
|
* 1-> name is a correct subvolume name
|
|
*/
|
|
int test_issubvolname(const char *name)
|
|
{
|
|
return name[0] != '\0' && !strchr(name, '/') &&
|
|
strcmp(name, ".") && strcmp(name, "..");
|
|
}
|
|
|
|
/*
|
|
* test if path is a directory
|
|
* this function return
|
|
* 0-> path exists but it is not a directory
|
|
* 1-> path exists and it is a directory
|
|
* -1 -> path is unaccessible
|
|
*/
|
|
int test_isdir(const char *path)
|
|
{
|
|
struct stat st;
|
|
int ret;
|
|
|
|
ret = stat(path, &st);
|
|
if(ret < 0 )
|
|
return -1;
|
|
|
|
return S_ISDIR(st.st_mode);
|
|
}
|
|
|
|
void units_set_mode(unsigned *units, unsigned mode)
|
|
{
|
|
unsigned base = *units & UNITS_MODE_MASK;
|
|
|
|
*units = base | mode;
|
|
}
|
|
|
|
void units_set_base(unsigned *units, unsigned base)
|
|
{
|
|
unsigned mode = *units & ~UNITS_MODE_MASK;
|
|
|
|
*units = base | mode;
|
|
}
|
|
|
|
int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
|
|
{
|
|
int level;
|
|
|
|
for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
|
|
if (!path->nodes[level])
|
|
break;
|
|
if (path->slots[level] + 1 >=
|
|
btrfs_header_nritems(path->nodes[level]))
|
|
continue;
|
|
if (level == 0)
|
|
btrfs_item_key_to_cpu(path->nodes[level], key,
|
|
path->slots[level] + 1);
|
|
else
|
|
btrfs_node_key_to_cpu(path->nodes[level], key,
|
|
path->slots[level] + 1);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
char* btrfs_group_type_str(u64 flag)
|
|
{
|
|
u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
|
|
BTRFS_SPACE_INFO_GLOBAL_RSV;
|
|
|
|
switch (flag & mask) {
|
|
case BTRFS_BLOCK_GROUP_DATA:
|
|
return "Data";
|
|
case BTRFS_BLOCK_GROUP_SYSTEM:
|
|
return "System";
|
|
case BTRFS_BLOCK_GROUP_METADATA:
|
|
return "Metadata";
|
|
case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
|
|
return "Data+Metadata";
|
|
case BTRFS_SPACE_INFO_GLOBAL_RSV:
|
|
return "GlobalReserve";
|
|
default:
|
|
return "unknown";
|
|
}
|
|
}
|
|
|
|
char* btrfs_group_profile_str(u64 flag)
|
|
{
|
|
switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
|
|
case 0:
|
|
return "single";
|
|
case BTRFS_BLOCK_GROUP_RAID0:
|
|
return "RAID0";
|
|
case BTRFS_BLOCK_GROUP_RAID1:
|
|
return "RAID1";
|
|
case BTRFS_BLOCK_GROUP_RAID5:
|
|
return "RAID5";
|
|
case BTRFS_BLOCK_GROUP_RAID6:
|
|
return "RAID6";
|
|
case BTRFS_BLOCK_GROUP_DUP:
|
|
return "DUP";
|
|
case BTRFS_BLOCK_GROUP_RAID10:
|
|
return "RAID10";
|
|
default:
|
|
return "unknown";
|
|
}
|
|
}
|
|
|
|
u64 disk_size(char *path)
|
|
{
|
|
struct statfs sfs;
|
|
|
|
if (statfs(path, &sfs) < 0)
|
|
return 0;
|
|
else
|
|
return sfs.f_bsize * sfs.f_blocks;
|
|
}
|
|
|
|
u64 get_partition_size(char *dev)
|
|
{
|
|
u64 result;
|
|
int fd = open(dev, O_RDONLY);
|
|
|
|
if (fd < 0)
|
|
return 0;
|
|
if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
close(fd);
|
|
|
|
return result;
|
|
}
|
|
|
|
int btrfs_tree_search2_ioctl_supported(int fd)
|
|
{
|
|
struct btrfs_ioctl_search_args_v2 *args2;
|
|
struct btrfs_ioctl_search_key *sk;
|
|
int args2_size = 1024;
|
|
char args2_buf[args2_size];
|
|
int ret;
|
|
static int v2_supported = -1;
|
|
|
|
if (v2_supported != -1)
|
|
return v2_supported;
|
|
|
|
args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
|
|
sk = &(args2->key);
|
|
|
|
/*
|
|
* Search for the extent tree item in the root tree.
|
|
*/
|
|
sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
|
|
sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
|
|
sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
|
|
sk->min_type = BTRFS_ROOT_ITEM_KEY;
|
|
sk->max_type = BTRFS_ROOT_ITEM_KEY;
|
|
sk->min_offset = 0;
|
|
sk->max_offset = (u64)-1;
|
|
sk->min_transid = 0;
|
|
sk->max_transid = (u64)-1;
|
|
sk->nr_items = 1;
|
|
args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
|
|
ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
|
|
if (ret == -EOPNOTSUPP)
|
|
v2_supported = 0;
|
|
else if (ret == 0)
|
|
v2_supported = 1;
|
|
else
|
|
return ret;
|
|
|
|
return v2_supported;
|
|
}
|
|
|
|
int btrfs_check_nodesize(u32 nodesize, u32 sectorsize)
|
|
{
|
|
if (nodesize < sectorsize) {
|
|
fprintf(stderr,
|
|
"ERROR: Illegal nodesize %u (smaller than %u)\n",
|
|
nodesize, sectorsize);
|
|
return -1;
|
|
} else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
|
|
fprintf(stderr,
|
|
"ERROR: Illegal nodesize %u (larger than %u)\n",
|
|
nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
|
|
return -1;
|
|
} else if (nodesize & (sectorsize - 1)) {
|
|
fprintf(stderr,
|
|
"ERROR: Illegal nodesize %u (not aligned to %u)\n",
|
|
nodesize, sectorsize);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|