mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-10 16:37:07 +00:00
e4df433b8a
As btrfs is specific to Linux, %m can be used instead of strerror(errno) in format strings. This has some size reduction benefits for embedded systems. glibc, musl, and uclibc-ng all support %m as a modifier to printf. A quick glance at the BIONIC libc source indicates that it has support for %m as well. BSDs and Windows do not but I do believe them to be beyond the scope of btrfs-progs. Compiled sizes on Ubuntu 16.04: Before: 3916512 btrfs 233688 libbtrfs.so.0.1 4899 bcp 2367672 btrfs-convert 2208488 btrfs-corrupt-block 13302 btrfs-debugfs 2152160 btrfs-debug-tree 2136024 btrfs-find-root 2287592 btrfs-image 2144600 btrfs-map-logical 2130760 btrfs-select-super 2152608 btrfstune 2131760 btrfs-zero-log 2277752 mkfs.btrfs 9166 show-blocks After: 3908744 btrfs 233256 libbtrfs.so.0.1 4899 bcp 2366560 btrfs-convert 2207432 btrfs-corrupt-block 13302 btrfs-debugfs 2151104 btrfs-debug-tree 2134968 btrfs-find-root 2281864 btrfs-image 2143536 btrfs-map-logical 2129704 btrfs-select-super 2151552 btrfstune 2130696 btrfs-zero-log 2276272 mkfs.btrfs 9166 show-blocks Total savings: 23928 (24 kilo)bytes Signed-off-by: Rosen Penev <rosenp@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
1713 lines
45 KiB
C
1713 lines
45 KiB
C
/*
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* Copyright (C) 2007 Oracle. 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 <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <uuid/uuid.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 "volumes.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 "print-tree.h"
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#include "rbtree-utils.h"
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/* specified errno for check_tree_block */
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#define BTRFS_BAD_BYTENR (-1)
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#define BTRFS_BAD_FSID (-2)
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#define BTRFS_BAD_LEVEL (-3)
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#define BTRFS_BAD_NRITEMS (-4)
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/* Calculate max possible nritems for a leaf/node */
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static u32 max_nritems(u8 level, u32 nodesize)
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{
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if (level == 0)
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return ((nodesize - sizeof(struct btrfs_header)) /
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sizeof(struct btrfs_item));
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return ((nodesize - sizeof(struct btrfs_header)) /
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sizeof(struct btrfs_key_ptr));
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}
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static int check_tree_block(struct btrfs_fs_info *fs_info,
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struct extent_buffer *buf)
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{
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struct btrfs_fs_devices *fs_devices;
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u32 nodesize = fs_info->nodesize;
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int ret = BTRFS_BAD_FSID;
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if (buf->start != btrfs_header_bytenr(buf))
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return BTRFS_BAD_BYTENR;
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if (btrfs_header_level(buf) >= BTRFS_MAX_LEVEL)
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return BTRFS_BAD_LEVEL;
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if (btrfs_header_nritems(buf) > max_nritems(btrfs_header_level(buf),
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nodesize))
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return BTRFS_BAD_NRITEMS;
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/* Only leaf can be empty */
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if (btrfs_header_nritems(buf) == 0 &&
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btrfs_header_level(buf) != 0)
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return BTRFS_BAD_NRITEMS;
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fs_devices = fs_info->fs_devices;
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while (fs_devices) {
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if (fs_info->ignore_fsid_mismatch ||
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!memcmp_extent_buffer(buf, fs_devices->fsid,
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btrfs_header_fsid(),
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BTRFS_FSID_SIZE)) {
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ret = 0;
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break;
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}
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fs_devices = fs_devices->seed;
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}
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return ret;
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}
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static void print_tree_block_error(struct btrfs_fs_info *fs_info,
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struct extent_buffer *eb,
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int err)
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{
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char fs_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
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char found_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
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u8 buf[BTRFS_UUID_SIZE];
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switch (err) {
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case BTRFS_BAD_FSID:
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read_extent_buffer(eb, buf, btrfs_header_fsid(),
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BTRFS_UUID_SIZE);
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uuid_unparse(buf, found_uuid);
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uuid_unparse(fs_info->fsid, fs_uuid);
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fprintf(stderr, "fsid mismatch, want=%s, have=%s\n",
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fs_uuid, found_uuid);
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break;
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case BTRFS_BAD_BYTENR:
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fprintf(stderr, "bytenr mismatch, want=%llu, have=%llu\n",
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eb->start, btrfs_header_bytenr(eb));
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break;
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case BTRFS_BAD_LEVEL:
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fprintf(stderr, "bad level, %u > %u\n",
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btrfs_header_level(eb), BTRFS_MAX_LEVEL);
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break;
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case BTRFS_BAD_NRITEMS:
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fprintf(stderr, "invalid nr_items: %u\n",
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btrfs_header_nritems(eb));
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break;
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}
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}
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u32 btrfs_csum_data(char *data, u32 seed, size_t len)
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{
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return crc32c(seed, data, len);
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}
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void btrfs_csum_final(u32 crc, u8 *result)
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{
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put_unaligned_le32(~crc, result);
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}
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static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
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int verify, int silent)
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{
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u8 result[BTRFS_CSUM_SIZE];
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u32 len;
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u32 crc = ~(u32)0;
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len = buf->len - BTRFS_CSUM_SIZE;
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crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
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btrfs_csum_final(crc, result);
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if (verify) {
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if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
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if (!silent)
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printk("checksum verify failed on %llu found %08X wanted %08X\n",
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(unsigned long long)buf->start,
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*((u32 *)result),
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*((u32*)(char *)buf->data));
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return 1;
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}
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} else {
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write_extent_buffer(buf, result, 0, csum_size);
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}
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return 0;
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}
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int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify)
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{
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return __csum_tree_block_size(buf, csum_size, verify, 0);
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}
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int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size)
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{
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return __csum_tree_block_size(buf, csum_size, 1, 1);
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}
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int csum_tree_block(struct btrfs_fs_info *fs_info,
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struct extent_buffer *buf, int verify)
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{
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u16 csum_size =
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btrfs_super_csum_size(fs_info->super_copy);
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if (verify && fs_info->suppress_check_block_errors)
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return verify_tree_block_csum_silent(buf, csum_size);
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return csum_tree_block_size(buf, csum_size, verify);
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}
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struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
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u64 bytenr, u32 blocksize)
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{
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return find_extent_buffer(&fs_info->extent_cache,
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bytenr, blocksize);
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}
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struct extent_buffer* btrfs_find_create_tree_block(
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struct btrfs_fs_info *fs_info, u64 bytenr)
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{
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return alloc_extent_buffer(&fs_info->extent_cache, bytenr,
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fs_info->nodesize);
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}
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void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
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u64 parent_transid)
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{
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struct extent_buffer *eb;
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u64 length;
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struct btrfs_multi_bio *multi = NULL;
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struct btrfs_device *device;
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eb = btrfs_find_tree_block(fs_info, bytenr, fs_info->nodesize);
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if (!(eb && btrfs_buffer_uptodate(eb, parent_transid)) &&
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!btrfs_map_block(fs_info, READ, bytenr, &length, &multi, 0,
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NULL)) {
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device = multi->stripes[0].dev;
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device->total_ios++;
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readahead(device->fd, multi->stripes[0].physical,
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fs_info->nodesize);
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}
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free_extent_buffer(eb);
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kfree(multi);
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}
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static int verify_parent_transid(struct extent_io_tree *io_tree,
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struct extent_buffer *eb, u64 parent_transid,
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int ignore)
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{
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int ret;
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if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
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return 0;
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if (extent_buffer_uptodate(eb) &&
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btrfs_header_generation(eb) == parent_transid) {
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ret = 0;
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goto out;
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}
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printk("parent transid verify failed on %llu wanted %llu found %llu\n",
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(unsigned long long)eb->start,
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(unsigned long long)parent_transid,
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(unsigned long long)btrfs_header_generation(eb));
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if (ignore) {
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eb->flags |= EXTENT_BAD_TRANSID;
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printk("Ignoring transid failure\n");
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return 0;
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}
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ret = 1;
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out:
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clear_extent_buffer_uptodate(eb);
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return ret;
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}
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int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
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{
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unsigned long offset = 0;
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struct btrfs_multi_bio *multi = NULL;
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struct btrfs_device *device;
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int ret = 0;
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u64 read_len;
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unsigned long bytes_left = eb->len;
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while (bytes_left) {
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read_len = bytes_left;
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device = NULL;
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if (!info->on_restoring &&
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eb->start != BTRFS_SUPER_INFO_OFFSET) {
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ret = btrfs_map_block(info, READ, eb->start + offset,
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&read_len, &multi, mirror, NULL);
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if (ret) {
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printk("Couldn't map the block %Lu\n", eb->start + offset);
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kfree(multi);
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return -EIO;
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}
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device = multi->stripes[0].dev;
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if (device->fd <= 0) {
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kfree(multi);
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return -EIO;
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}
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eb->fd = device->fd;
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device->total_ios++;
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eb->dev_bytenr = multi->stripes[0].physical;
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kfree(multi);
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multi = NULL;
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} else {
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/* special case for restore metadump */
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list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
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if (device->devid == 1)
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break;
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}
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eb->fd = device->fd;
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eb->dev_bytenr = eb->start;
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device->total_ios++;
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}
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if (read_len > bytes_left)
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read_len = bytes_left;
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ret = read_extent_from_disk(eb, offset, read_len);
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if (ret)
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return -EIO;
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offset += read_len;
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bytes_left -= read_len;
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}
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return 0;
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}
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struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
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u64 parent_transid)
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{
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int ret;
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struct extent_buffer *eb;
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u64 best_transid = 0;
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u32 sectorsize = fs_info->sectorsize;
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int mirror_num = 0;
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int good_mirror = 0;
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int num_copies;
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int ignore = 0;
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/*
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* Don't even try to create tree block for unaligned tree block
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* bytenr.
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* Such unaligned tree block will free overlapping extent buffer,
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* causing use-after-free bugs for fuzzed images.
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*/
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if (bytenr < sectorsize || !IS_ALIGNED(bytenr, sectorsize)) {
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error("tree block bytenr %llu is not aligned to sectorsize %u",
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bytenr, sectorsize);
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return ERR_PTR(-EIO);
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}
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eb = btrfs_find_create_tree_block(fs_info, bytenr);
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if (!eb)
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return ERR_PTR(-ENOMEM);
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if (btrfs_buffer_uptodate(eb, parent_transid))
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return eb;
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while (1) {
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ret = read_whole_eb(fs_info, eb, mirror_num);
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if (ret == 0 && csum_tree_block(fs_info, eb, 1) == 0 &&
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check_tree_block(fs_info, eb) == 0 &&
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verify_parent_transid(eb->tree, eb, parent_transid, ignore)
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== 0) {
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if (eb->flags & EXTENT_BAD_TRANSID &&
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list_empty(&eb->recow)) {
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list_add_tail(&eb->recow,
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&fs_info->recow_ebs);
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eb->refs++;
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}
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btrfs_set_buffer_uptodate(eb);
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return eb;
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}
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if (ignore) {
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if (check_tree_block(fs_info, eb)) {
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if (!fs_info->suppress_check_block_errors)
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print_tree_block_error(fs_info, eb,
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check_tree_block(fs_info, eb));
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} else {
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if (!fs_info->suppress_check_block_errors)
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fprintf(stderr, "Csum didn't match\n");
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}
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ret = -EIO;
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break;
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}
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num_copies = btrfs_num_copies(fs_info, eb->start, eb->len);
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if (num_copies == 1) {
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ignore = 1;
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continue;
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}
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if (btrfs_header_generation(eb) > best_transid && mirror_num) {
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best_transid = btrfs_header_generation(eb);
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good_mirror = mirror_num;
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}
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mirror_num++;
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if (mirror_num > num_copies) {
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mirror_num = good_mirror;
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ignore = 1;
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continue;
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}
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}
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free_extent_buffer(eb);
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return ERR_PTR(ret);
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}
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int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
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u64 *len, int mirror)
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{
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u64 offset = 0;
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struct btrfs_multi_bio *multi = NULL;
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struct btrfs_device *device;
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int ret = 0;
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u64 max_len = *len;
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ret = btrfs_map_block(fs_info, READ, logical, len, &multi, mirror,
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NULL);
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if (ret) {
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fprintf(stderr, "Couldn't map the block %llu\n",
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logical + offset);
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goto err;
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}
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device = multi->stripes[0].dev;
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if (device->fd <= 0)
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goto err;
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if (*len > max_len)
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*len = max_len;
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ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
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if (ret != *len)
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ret = -EIO;
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else
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ret = 0;
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err:
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kfree(multi);
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return ret;
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}
|
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|
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int write_and_map_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb)
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{
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int ret;
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int dev_nr;
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u64 length;
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u64 *raid_map = NULL;
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struct btrfs_multi_bio *multi = NULL;
|
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dev_nr = 0;
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length = eb->len;
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ret = btrfs_map_block(fs_info, WRITE, eb->start, &length,
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&multi, 0, &raid_map);
|
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|
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if (raid_map) {
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ret = write_raid56_with_parity(fs_info, eb, multi,
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length, raid_map);
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BUG_ON(ret);
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} else while (dev_nr < multi->num_stripes) {
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BUG_ON(ret);
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eb->fd = multi->stripes[dev_nr].dev->fd;
|
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eb->dev_bytenr = multi->stripes[dev_nr].physical;
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multi->stripes[dev_nr].dev->total_ios++;
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dev_nr++;
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ret = write_extent_to_disk(eb);
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BUG_ON(ret);
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}
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kfree(raid_map);
|
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kfree(multi);
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return 0;
|
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}
|
|
|
|
int write_tree_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct extent_buffer *eb)
|
|
{
|
|
if (check_tree_block(fs_info, eb)) {
|
|
print_tree_block_error(fs_info, eb,
|
|
check_tree_block(fs_info, eb));
|
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BUG();
|
|
}
|
|
|
|
if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
|
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BUG();
|
|
|
|
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
|
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csum_tree_block(fs_info, eb, 0);
|
|
|
|
return write_and_map_eb(fs_info, eb);
|
|
}
|
|
|
|
void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
|
|
u64 objectid)
|
|
{
|
|
root->node = NULL;
|
|
root->commit_root = NULL;
|
|
root->ref_cows = 0;
|
|
root->track_dirty = 0;
|
|
|
|
root->fs_info = fs_info;
|
|
root->objectid = objectid;
|
|
root->last_trans = 0;
|
|
root->last_inode_alloc = 0;
|
|
|
|
INIT_LIST_HEAD(&root->dirty_list);
|
|
INIT_LIST_HEAD(&root->orphan_data_extents);
|
|
memset(&root->root_key, 0, sizeof(root->root_key));
|
|
memset(&root->root_item, 0, sizeof(root->root_item));
|
|
root->root_key.objectid = objectid;
|
|
}
|
|
|
|
static int find_and_setup_root(struct btrfs_root *tree_root,
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 objectid, struct btrfs_root *root)
|
|
{
|
|
int ret;
|
|
u64 generation;
|
|
|
|
btrfs_setup_root(root, fs_info, objectid);
|
|
ret = btrfs_find_last_root(tree_root, objectid,
|
|
&root->root_item, &root->root_key);
|
|
if (ret)
|
|
return ret;
|
|
|
|
generation = btrfs_root_generation(&root->root_item);
|
|
root->node = read_tree_block(fs_info,
|
|
btrfs_root_bytenr(&root->root_item), generation);
|
|
if (!extent_buffer_uptodate(root->node))
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int find_and_setup_log_root(struct btrfs_root *tree_root,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_super_block *disk_super)
|
|
{
|
|
u64 blocknr = btrfs_super_log_root(disk_super);
|
|
struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
|
|
|
|
if (!log_root)
|
|
return -ENOMEM;
|
|
|
|
if (blocknr == 0) {
|
|
free(log_root);
|
|
return 0;
|
|
}
|
|
|
|
btrfs_setup_root(log_root, fs_info,
|
|
BTRFS_TREE_LOG_OBJECTID);
|
|
|
|
log_root->node = read_tree_block(fs_info, blocknr,
|
|
btrfs_super_generation(disk_super) + 1);
|
|
|
|
fs_info->log_root_tree = log_root;
|
|
|
|
if (!extent_buffer_uptodate(log_root->node)) {
|
|
free_extent_buffer(log_root->node);
|
|
free(log_root);
|
|
fs_info->log_root_tree = NULL;
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_free_fs_root(struct btrfs_root *root)
|
|
{
|
|
if (root->node)
|
|
free_extent_buffer(root->node);
|
|
if (root->commit_root)
|
|
free_extent_buffer(root->commit_root);
|
|
kfree(root);
|
|
return 0;
|
|
}
|
|
|
|
static void __free_fs_root(struct rb_node *node)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
root = container_of(node, struct btrfs_root, rb_node);
|
|
btrfs_free_fs_root(root);
|
|
}
|
|
|
|
FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
|
|
|
|
struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_key *location)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *l;
|
|
u64 generation;
|
|
int ret = 0;
|
|
|
|
root = calloc(1, sizeof(*root));
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (location->offset == (u64)-1) {
|
|
ret = find_and_setup_root(tree_root, fs_info,
|
|
location->objectid, root);
|
|
if (ret) {
|
|
free(root);
|
|
return ERR_PTR(ret);
|
|
}
|
|
goto insert;
|
|
}
|
|
|
|
btrfs_setup_root(root, fs_info,
|
|
location->objectid);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
free(root);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
|
|
if (ret != 0) {
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
l = path->nodes[0];
|
|
read_extent_buffer(l, &root->root_item,
|
|
btrfs_item_ptr_offset(l, path->slots[0]),
|
|
sizeof(root->root_item));
|
|
memcpy(&root->root_key, location, sizeof(*location));
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
if (ret) {
|
|
free(root);
|
|
return ERR_PTR(ret);
|
|
}
|
|
generation = btrfs_root_generation(&root->root_item);
|
|
root->node = read_tree_block(fs_info,
|
|
btrfs_root_bytenr(&root->root_item), generation);
|
|
if (!extent_buffer_uptodate(root->node)) {
|
|
free(root);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
insert:
|
|
root->ref_cows = 1;
|
|
return root;
|
|
}
|
|
|
|
static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
|
|
void *data)
|
|
{
|
|
u64 objectid = *((u64 *)data);
|
|
struct btrfs_root *root;
|
|
|
|
root = rb_entry(node, struct btrfs_root, rb_node);
|
|
if (objectid > root->objectid)
|
|
return 1;
|
|
else if (objectid < root->objectid)
|
|
return -1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
|
|
struct rb_node *node2)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
root = rb_entry(node2, struct btrfs_root, rb_node);
|
|
return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
|
|
}
|
|
|
|
struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_key *location)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct rb_node *node;
|
|
int ret;
|
|
u64 objectid = location->objectid;
|
|
|
|
if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
|
|
return fs_info->tree_root;
|
|
if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
|
|
return fs_info->extent_root;
|
|
if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
|
|
return fs_info->chunk_root;
|
|
if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
|
|
return fs_info->dev_root;
|
|
if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
|
|
return fs_info->csum_root;
|
|
if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
|
|
return fs_info->quota_enabled ? fs_info->quota_root :
|
|
ERR_PTR(-ENOENT);
|
|
|
|
BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
|
|
location->offset != (u64)-1);
|
|
|
|
node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
|
|
btrfs_fs_roots_compare_objectids, NULL);
|
|
if (node)
|
|
return container_of(node, struct btrfs_root, rb_node);
|
|
|
|
root = btrfs_read_fs_root_no_cache(fs_info, location);
|
|
if (IS_ERR(root))
|
|
return root;
|
|
|
|
ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
|
|
btrfs_fs_roots_compare_roots);
|
|
BUG_ON(ret);
|
|
return root;
|
|
}
|
|
|
|
void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
|
|
{
|
|
if (fs_info->quota_root)
|
|
free(fs_info->quota_root);
|
|
|
|
free(fs_info->tree_root);
|
|
free(fs_info->extent_root);
|
|
free(fs_info->chunk_root);
|
|
free(fs_info->dev_root);
|
|
free(fs_info->csum_root);
|
|
free(fs_info->free_space_root);
|
|
free(fs_info->super_copy);
|
|
free(fs_info->log_root_tree);
|
|
free(fs_info);
|
|
}
|
|
|
|
struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
|
|
{
|
|
struct btrfs_fs_info *fs_info;
|
|
|
|
fs_info = calloc(1, sizeof(struct btrfs_fs_info));
|
|
if (!fs_info)
|
|
return NULL;
|
|
|
|
fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
|
|
fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
|
|
fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
|
|
fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
|
|
fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
|
|
fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
|
|
fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
|
|
fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
|
|
|
|
if (!fs_info->tree_root || !fs_info->extent_root ||
|
|
!fs_info->chunk_root || !fs_info->dev_root ||
|
|
!fs_info->csum_root || !fs_info->quota_root ||
|
|
!fs_info->free_space_root || !fs_info->super_copy)
|
|
goto free_all;
|
|
|
|
extent_io_tree_init(&fs_info->extent_cache);
|
|
extent_io_tree_init(&fs_info->free_space_cache);
|
|
extent_io_tree_init(&fs_info->block_group_cache);
|
|
extent_io_tree_init(&fs_info->pinned_extents);
|
|
extent_io_tree_init(&fs_info->pending_del);
|
|
extent_io_tree_init(&fs_info->extent_ins);
|
|
fs_info->excluded_extents = NULL;
|
|
|
|
fs_info->fs_root_tree = RB_ROOT;
|
|
cache_tree_init(&fs_info->mapping_tree.cache_tree);
|
|
|
|
mutex_init(&fs_info->fs_mutex);
|
|
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
|
|
INIT_LIST_HEAD(&fs_info->space_info);
|
|
INIT_LIST_HEAD(&fs_info->recow_ebs);
|
|
|
|
if (!writable)
|
|
fs_info->readonly = 1;
|
|
|
|
fs_info->super_bytenr = sb_bytenr;
|
|
fs_info->data_alloc_profile = (u64)-1;
|
|
fs_info->metadata_alloc_profile = (u64)-1;
|
|
fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
|
|
return fs_info;
|
|
free_all:
|
|
btrfs_free_fs_info(fs_info);
|
|
return NULL;
|
|
}
|
|
|
|
int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
|
|
unsigned int flags)
|
|
{
|
|
u64 features;
|
|
|
|
features = btrfs_super_incompat_flags(sb) &
|
|
~BTRFS_FEATURE_INCOMPAT_SUPP;
|
|
if (features) {
|
|
printk("couldn't open because of unsupported "
|
|
"option features (%Lx).\n",
|
|
(unsigned long long)features);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
features = btrfs_super_incompat_flags(sb);
|
|
if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
|
|
features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
|
|
btrfs_set_super_incompat_flags(sb, features);
|
|
}
|
|
|
|
features = btrfs_super_compat_ro_flags(sb);
|
|
if (flags & OPEN_CTREE_WRITES) {
|
|
if (flags & OPEN_CTREE_INVALIDATE_FST) {
|
|
/* Clear the FREE_SPACE_TREE_VALID bit on disk... */
|
|
features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID;
|
|
btrfs_set_super_compat_ro_flags(sb, features);
|
|
/* ... and ignore the free space tree bit. */
|
|
features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE;
|
|
}
|
|
if (features & ~BTRFS_FEATURE_COMPAT_RO_SUPP) {
|
|
printk("couldn't open RDWR because of unsupported "
|
|
"option features (%Lx).\n",
|
|
(unsigned long long)features);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int find_best_backup_root(struct btrfs_super_block *super)
|
|
{
|
|
struct btrfs_root_backup *backup;
|
|
u64 orig_gen = btrfs_super_generation(super);
|
|
u64 gen = 0;
|
|
int best_index = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
|
|
backup = super->super_roots + i;
|
|
if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
|
|
btrfs_backup_tree_root_gen(backup) > gen) {
|
|
best_index = i;
|
|
gen = btrfs_backup_tree_root_gen(backup);
|
|
}
|
|
}
|
|
return best_index;
|
|
}
|
|
|
|
static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
|
|
unsigned flags,
|
|
struct btrfs_root *info_root,
|
|
u64 objectid, char *str)
|
|
{
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
int ret;
|
|
|
|
ret = find_and_setup_root(root, fs_info, objectid, info_root);
|
|
if (ret) {
|
|
printk("Couldn't setup %s tree\n", str);
|
|
if (!(flags & OPEN_CTREE_PARTIAL))
|
|
return -EIO;
|
|
/*
|
|
* Need a blank node here just so we don't screw up in the
|
|
* million of places that assume a root has a valid ->node
|
|
*/
|
|
info_root->node =
|
|
btrfs_find_create_tree_block(fs_info, 0);
|
|
if (!info_root->node)
|
|
return -ENOMEM;
|
|
clear_extent_buffer_uptodate(info_root->node);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
|
|
unsigned flags)
|
|
{
|
|
struct btrfs_super_block *sb = fs_info->super_copy;
|
|
struct btrfs_root *root;
|
|
struct btrfs_key key;
|
|
u64 generation;
|
|
int ret;
|
|
|
|
root = fs_info->tree_root;
|
|
btrfs_setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
|
|
generation = btrfs_super_generation(sb);
|
|
|
|
if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
|
|
root_tree_bytenr = btrfs_super_root(sb);
|
|
} else if (flags & OPEN_CTREE_BACKUP_ROOT) {
|
|
struct btrfs_root_backup *backup;
|
|
int index = find_best_backup_root(sb);
|
|
if (index >= BTRFS_NUM_BACKUP_ROOTS) {
|
|
fprintf(stderr, "Invalid backup root number\n");
|
|
return -EIO;
|
|
}
|
|
backup = fs_info->super_copy->super_roots + index;
|
|
root_tree_bytenr = btrfs_backup_tree_root(backup);
|
|
generation = btrfs_backup_tree_root_gen(backup);
|
|
}
|
|
|
|
root->node = read_tree_block(fs_info, root_tree_bytenr, generation);
|
|
if (!extent_buffer_uptodate(root->node)) {
|
|
fprintf(stderr, "Couldn't read tree root\n");
|
|
return -EIO;
|
|
}
|
|
|
|
ret = setup_root_or_create_block(fs_info, flags, fs_info->extent_root,
|
|
BTRFS_EXTENT_TREE_OBJECTID, "extent");
|
|
if (ret)
|
|
return ret;
|
|
fs_info->extent_root->track_dirty = 1;
|
|
|
|
ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
|
|
fs_info->dev_root);
|
|
if (ret) {
|
|
printk("Couldn't setup device tree\n");
|
|
return -EIO;
|
|
}
|
|
fs_info->dev_root->track_dirty = 1;
|
|
|
|
ret = setup_root_or_create_block(fs_info, flags, fs_info->csum_root,
|
|
BTRFS_CSUM_TREE_OBJECTID, "csum");
|
|
if (ret)
|
|
return ret;
|
|
fs_info->csum_root->track_dirty = 1;
|
|
|
|
ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
|
|
fs_info->quota_root);
|
|
if (ret) {
|
|
free(fs_info->quota_root);
|
|
fs_info->quota_root = NULL;
|
|
} else {
|
|
fs_info->quota_enabled = 1;
|
|
}
|
|
|
|
if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
|
|
ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
|
|
fs_info->free_space_root);
|
|
if (ret) {
|
|
printk("Couldn't read free space tree\n");
|
|
return -EIO;
|
|
}
|
|
fs_info->free_space_root->track_dirty = 1;
|
|
}
|
|
|
|
ret = find_and_setup_log_root(root, fs_info, sb);
|
|
if (ret) {
|
|
printk("Couldn't setup log root tree\n");
|
|
if (!(flags & OPEN_CTREE_PARTIAL))
|
|
return -EIO;
|
|
}
|
|
|
|
fs_info->generation = generation;
|
|
fs_info->last_trans_committed = generation;
|
|
if (extent_buffer_uptodate(fs_info->extent_root->node) &&
|
|
!(flags & OPEN_CTREE_NO_BLOCK_GROUPS)) {
|
|
ret = btrfs_read_block_groups(fs_info->tree_root);
|
|
/*
|
|
* If we don't find any blockgroups (ENOENT) we're either
|
|
* restoring or creating the filesystem, where it's expected,
|
|
* anything else is error
|
|
*/
|
|
if (ret != -ENOENT)
|
|
return -EIO;
|
|
}
|
|
|
|
key.objectid = BTRFS_FS_TREE_OBJECTID;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
|
|
|
|
if (IS_ERR(fs_info->fs_root))
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
if (fs_info->free_space_root)
|
|
free_extent_buffer(fs_info->free_space_root->node);
|
|
if (fs_info->quota_root)
|
|
free_extent_buffer(fs_info->quota_root->node);
|
|
if (fs_info->csum_root)
|
|
free_extent_buffer(fs_info->csum_root->node);
|
|
if (fs_info->dev_root)
|
|
free_extent_buffer(fs_info->dev_root->node);
|
|
if (fs_info->extent_root)
|
|
free_extent_buffer(fs_info->extent_root->node);
|
|
if (fs_info->tree_root)
|
|
free_extent_buffer(fs_info->tree_root->node);
|
|
if (fs_info->log_root_tree)
|
|
free_extent_buffer(fs_info->log_root_tree->node);
|
|
if (fs_info->chunk_root)
|
|
free_extent_buffer(fs_info->chunk_root->node);
|
|
}
|
|
|
|
static void free_map_lookup(struct cache_extent *ce)
|
|
{
|
|
struct map_lookup *map;
|
|
|
|
map = container_of(ce, struct map_lookup, ce);
|
|
kfree(map);
|
|
}
|
|
|
|
FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
|
|
|
|
void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
|
|
{
|
|
while (!list_empty(&fs_info->recow_ebs)) {
|
|
struct extent_buffer *eb;
|
|
eb = list_first_entry(&fs_info->recow_ebs,
|
|
struct extent_buffer, recow);
|
|
list_del_init(&eb->recow);
|
|
free_extent_buffer(eb);
|
|
}
|
|
free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
|
|
extent_io_tree_cleanup(&fs_info->extent_cache);
|
|
extent_io_tree_cleanup(&fs_info->free_space_cache);
|
|
extent_io_tree_cleanup(&fs_info->block_group_cache);
|
|
extent_io_tree_cleanup(&fs_info->pinned_extents);
|
|
extent_io_tree_cleanup(&fs_info->pending_del);
|
|
extent_io_tree_cleanup(&fs_info->extent_ins);
|
|
}
|
|
|
|
int btrfs_scan_fs_devices(int fd, const char *path,
|
|
struct btrfs_fs_devices **fs_devices,
|
|
u64 sb_bytenr, unsigned sbflags,
|
|
int skip_devices)
|
|
{
|
|
u64 total_devs;
|
|
u64 dev_size;
|
|
off_t seek_ret;
|
|
int ret;
|
|
if (!sb_bytenr)
|
|
sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
|
|
|
|
seek_ret = lseek(fd, 0, SEEK_END);
|
|
if (seek_ret < 0)
|
|
return -errno;
|
|
|
|
dev_size = seek_ret;
|
|
lseek(fd, 0, SEEK_SET);
|
|
if (sb_bytenr > dev_size) {
|
|
error("superblock bytenr %llu is larger than device size %llu",
|
|
(unsigned long long)sb_bytenr,
|
|
(unsigned long long)dev_size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = btrfs_scan_one_device(fd, path, fs_devices,
|
|
&total_devs, sb_bytenr, sbflags);
|
|
if (ret) {
|
|
fprintf(stderr, "No valid Btrfs found on %s\n", path);
|
|
return ret;
|
|
}
|
|
|
|
if (!skip_devices && total_devs != 1) {
|
|
ret = btrfs_scan_devices();
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
|
|
u64 chunk_root_bytenr)
|
|
{
|
|
struct btrfs_super_block *sb = fs_info->super_copy;
|
|
u64 generation;
|
|
int ret;
|
|
|
|
btrfs_setup_root(fs_info->chunk_root, fs_info,
|
|
BTRFS_CHUNK_TREE_OBJECTID);
|
|
|
|
ret = btrfs_read_sys_array(fs_info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
generation = btrfs_super_chunk_root_generation(sb);
|
|
|
|
if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
|
|
fs_info->sectorsize)) {
|
|
warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
|
|
chunk_root_bytenr, fs_info->sectorsize);
|
|
chunk_root_bytenr = 0;
|
|
}
|
|
|
|
if (!chunk_root_bytenr)
|
|
chunk_root_bytenr = btrfs_super_chunk_root(sb);
|
|
else
|
|
generation = 0;
|
|
|
|
fs_info->chunk_root->node = read_tree_block(fs_info,
|
|
chunk_root_bytenr,
|
|
generation);
|
|
if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
|
|
if (fs_info->ignore_chunk_tree_error) {
|
|
warning("cannot read chunk root, continue anyway");
|
|
fs_info->chunk_root = NULL;
|
|
return 0;
|
|
} else {
|
|
error("cannot read chunk root");
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
|
|
ret = btrfs_read_chunk_tree(fs_info);
|
|
if (ret) {
|
|
fprintf(stderr, "Couldn't read chunk tree\n");
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
|
|
u64 sb_bytenr,
|
|
u64 root_tree_bytenr,
|
|
u64 chunk_root_bytenr,
|
|
unsigned flags)
|
|
{
|
|
struct btrfs_fs_info *fs_info;
|
|
struct btrfs_super_block *disk_super;
|
|
struct btrfs_fs_devices *fs_devices = NULL;
|
|
struct extent_buffer *eb;
|
|
int ret;
|
|
int oflags;
|
|
unsigned sbflags = SBREAD_DEFAULT;
|
|
|
|
if (sb_bytenr == 0)
|
|
sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
|
|
|
|
/* try to drop all the caches */
|
|
if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
|
|
fprintf(stderr, "Warning, could not drop caches\n");
|
|
|
|
fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
|
|
if (!fs_info) {
|
|
fprintf(stderr, "Failed to allocate memory for fs_info\n");
|
|
return NULL;
|
|
}
|
|
if (flags & OPEN_CTREE_RESTORE)
|
|
fs_info->on_restoring = 1;
|
|
if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
|
|
fs_info->suppress_check_block_errors = 1;
|
|
if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
|
|
fs_info->ignore_fsid_mismatch = 1;
|
|
if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
|
|
fs_info->ignore_chunk_tree_error = 1;
|
|
|
|
if ((flags & OPEN_CTREE_RECOVER_SUPER)
|
|
&& (flags & OPEN_CTREE_FS_PARTIAL)) {
|
|
fprintf(stderr,
|
|
"cannot open a partially created filesystem for recovery");
|
|
goto out;
|
|
}
|
|
|
|
if (flags & OPEN_CTREE_FS_PARTIAL)
|
|
sbflags = SBREAD_PARTIAL;
|
|
|
|
ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
|
|
(flags & OPEN_CTREE_NO_DEVICES));
|
|
if (ret)
|
|
goto out;
|
|
|
|
fs_info->fs_devices = fs_devices;
|
|
if (flags & OPEN_CTREE_WRITES)
|
|
oflags = O_RDWR;
|
|
else
|
|
oflags = O_RDONLY;
|
|
|
|
if (flags & OPEN_CTREE_EXCLUSIVE)
|
|
oflags |= O_EXCL;
|
|
|
|
ret = btrfs_open_devices(fs_devices, oflags);
|
|
if (ret)
|
|
goto out;
|
|
|
|
disk_super = fs_info->super_copy;
|
|
if (flags & OPEN_CTREE_RECOVER_SUPER)
|
|
ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
|
|
sb_bytenr, SBREAD_RECOVER);
|
|
else
|
|
ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
|
|
sbflags);
|
|
if (ret) {
|
|
printk("No valid btrfs found\n");
|
|
goto out_devices;
|
|
}
|
|
|
|
if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
|
|
!fs_info->ignore_fsid_mismatch) {
|
|
fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
|
|
goto out_devices;
|
|
}
|
|
|
|
memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
|
|
fs_info->sectorsize = btrfs_super_sectorsize(disk_super);
|
|
fs_info->nodesize = btrfs_super_nodesize(disk_super);
|
|
fs_info->stripesize = btrfs_super_stripesize(disk_super);
|
|
|
|
ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
|
|
if (ret)
|
|
goto out_devices;
|
|
|
|
ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
|
|
if (ret)
|
|
goto out_chunk;
|
|
|
|
/* Chunk tree root is unable to read, return directly */
|
|
if (!fs_info->chunk_root)
|
|
return fs_info;
|
|
|
|
eb = fs_info->chunk_root->node;
|
|
read_extent_buffer(eb, fs_info->chunk_tree_uuid,
|
|
btrfs_header_chunk_tree_uuid(eb),
|
|
BTRFS_UUID_SIZE);
|
|
|
|
ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
|
|
if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
|
|
!fs_info->ignore_chunk_tree_error)
|
|
goto out_chunk;
|
|
|
|
return fs_info;
|
|
|
|
out_chunk:
|
|
btrfs_release_all_roots(fs_info);
|
|
btrfs_cleanup_all_caches(fs_info);
|
|
out_devices:
|
|
btrfs_close_devices(fs_devices);
|
|
out:
|
|
btrfs_free_fs_info(fs_info);
|
|
return NULL;
|
|
}
|
|
|
|
struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
|
|
u64 sb_bytenr, u64 root_tree_bytenr,
|
|
u64 chunk_root_bytenr,
|
|
unsigned flags)
|
|
{
|
|
int fp;
|
|
int ret;
|
|
struct btrfs_fs_info *info;
|
|
int oflags = O_RDWR;
|
|
struct stat st;
|
|
|
|
ret = stat(filename, &st);
|
|
if (ret < 0) {
|
|
error("cannot stat '%s': %m", filename);
|
|
return NULL;
|
|
}
|
|
if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
|
|
error("not a regular file or block device: %s", filename);
|
|
return NULL;
|
|
}
|
|
|
|
if (!(flags & OPEN_CTREE_WRITES))
|
|
oflags = O_RDONLY;
|
|
|
|
fp = open(filename, oflags);
|
|
if (fp < 0) {
|
|
error("cannot open '%s': %m", filename);
|
|
return NULL;
|
|
}
|
|
info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
|
|
chunk_root_bytenr, flags);
|
|
close(fp);
|
|
return info;
|
|
}
|
|
|
|
struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
|
|
unsigned flags)
|
|
{
|
|
struct btrfs_fs_info *info;
|
|
|
|
/* This flags may not return fs_info with any valid root */
|
|
BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
|
|
info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
|
|
if (!info)
|
|
return NULL;
|
|
if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
|
|
return info->chunk_root;
|
|
return info->fs_root;
|
|
}
|
|
|
|
struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
|
|
unsigned flags)
|
|
{
|
|
struct btrfs_fs_info *info;
|
|
|
|
/* This flags may not return fs_info with any valid root */
|
|
if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR) {
|
|
error("invalid open_ctree flags: 0x%llx",
|
|
(unsigned long long)flags);
|
|
return NULL;
|
|
}
|
|
info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
|
|
if (!info)
|
|
return NULL;
|
|
if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
|
|
return info->chunk_root;
|
|
return info->fs_root;
|
|
}
|
|
|
|
/*
|
|
* Check if the super is valid:
|
|
* - nodesize/sectorsize - minimum, maximum, alignment
|
|
* - tree block starts - alignment
|
|
* - number of devices - something sane
|
|
* - sys array size - maximum
|
|
*/
|
|
static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
|
|
{
|
|
u8 result[BTRFS_CSUM_SIZE];
|
|
u32 crc;
|
|
u16 csum_type;
|
|
int csum_size;
|
|
|
|
if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
|
|
if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
|
|
if (!(sbflags & SBREAD_PARTIAL)) {
|
|
error("superblock magic doesn't match");
|
|
return -EIO;
|
|
}
|
|
}
|
|
}
|
|
|
|
csum_type = btrfs_super_csum_type(sb);
|
|
if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
|
|
error("unsupported checksum algorithm %u", csum_type);
|
|
return -EIO;
|
|
}
|
|
csum_size = btrfs_csum_sizes[csum_type];
|
|
|
|
crc = ~(u32)0;
|
|
crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
|
|
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
|
|
btrfs_csum_final(crc, result);
|
|
|
|
if (memcmp(result, sb->csum, csum_size)) {
|
|
error("superblock checksum mismatch");
|
|
return -EIO;
|
|
}
|
|
if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
error("tree_root level too big: %d >= %d",
|
|
btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
|
|
goto error_out;
|
|
}
|
|
if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
error("chunk_root level too big: %d >= %d",
|
|
btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
|
|
goto error_out;
|
|
}
|
|
if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
error("log_root level too big: %d >= %d",
|
|
btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
|
|
goto error_out;
|
|
}
|
|
|
|
if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
|
|
error("tree_root block unaligned: %llu", btrfs_super_root(sb));
|
|
goto error_out;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
|
|
error("chunk_root block unaligned: %llu",
|
|
btrfs_super_chunk_root(sb));
|
|
goto error_out;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
|
|
error("log_root block unaligned: %llu",
|
|
btrfs_super_log_root(sb));
|
|
goto error_out;
|
|
}
|
|
if (btrfs_super_nodesize(sb) < 4096) {
|
|
error("nodesize too small: %u < 4096",
|
|
btrfs_super_nodesize(sb));
|
|
goto error_out;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
|
|
error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
|
|
goto error_out;
|
|
}
|
|
if (btrfs_super_sectorsize(sb) < 4096) {
|
|
error("sectorsize too small: %u < 4096",
|
|
btrfs_super_sectorsize(sb));
|
|
goto error_out;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
|
|
error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
|
|
goto error_out;
|
|
}
|
|
if (btrfs_super_total_bytes(sb) == 0) {
|
|
error("invalid total_bytes 0");
|
|
goto error_out;
|
|
}
|
|
if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
|
|
error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
|
|
goto error_out;
|
|
}
|
|
if ((btrfs_super_stripesize(sb) != 4096)
|
|
&& (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
|
|
error("invalid stripesize %u", btrfs_super_stripesize(sb));
|
|
goto error_out;
|
|
}
|
|
|
|
if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
|
|
char fsid[BTRFS_UUID_UNPARSED_SIZE];
|
|
char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
|
|
|
|
uuid_unparse(sb->fsid, fsid);
|
|
uuid_unparse(sb->dev_item.fsid, dev_fsid);
|
|
error("dev_item UUID does not match fsid: %s != %s",
|
|
dev_fsid, fsid);
|
|
goto error_out;
|
|
}
|
|
|
|
/*
|
|
* Hint to catch really bogus numbers, bitflips or so
|
|
*/
|
|
if (btrfs_super_num_devices(sb) > (1UL << 31)) {
|
|
warning("suspicious number of devices: %llu",
|
|
btrfs_super_num_devices(sb));
|
|
}
|
|
|
|
if (btrfs_super_num_devices(sb) == 0) {
|
|
error("number of devices is 0");
|
|
goto error_out;
|
|
}
|
|
|
|
/*
|
|
* Obvious sys_chunk_array corruptions, it must hold at least one key
|
|
* and one chunk
|
|
*/
|
|
if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
|
|
error("system chunk array too big %u > %u",
|
|
btrfs_super_sys_array_size(sb),
|
|
BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
|
|
goto error_out;
|
|
}
|
|
if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
|
|
+ sizeof(struct btrfs_chunk)) {
|
|
error("system chunk array too small %u < %zu",
|
|
btrfs_super_sys_array_size(sb),
|
|
sizeof(struct btrfs_disk_key) +
|
|
sizeof(struct btrfs_chunk));
|
|
goto error_out;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error_out:
|
|
error("superblock checksum matches but it has invalid members");
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* btrfs_read_dev_super - read a valid superblock from a block device
|
|
* @fd: file descriptor of the device
|
|
* @sb: buffer where the superblock is going to be read in
|
|
* @sb_bytenr: offset of the particular superblock copy we want
|
|
* @sbflags: flags controlling how the superblock is read
|
|
*
|
|
* This function is used by various btrfs comands to obtain a valid superblock.
|
|
*
|
|
* It's mode of operation is controlled by the @sb_bytenr and @sbdflags
|
|
* parameters. If SBREAD_RECOVER flag is set and @sb_bytenr is
|
|
* BTRFS_SUPER_INFO_OFFSET then the function reads all 3 superblock copies and
|
|
* returns the newest one. If SBREAD_RECOVER is not set then only a single
|
|
* copy is read, which one is decided by @sb_bytenr. If @sb_bytenr !=
|
|
* BTRFS_SUPER_INFO_OFFSET then the @sbflags is effectively ignored and only a
|
|
* single copy is read.
|
|
*/
|
|
int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
|
|
unsigned sbflags)
|
|
{
|
|
u8 fsid[BTRFS_FSID_SIZE];
|
|
int fsid_is_initialized = 0;
|
|
char tmp[BTRFS_SUPER_INFO_SIZE];
|
|
struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
|
|
int i;
|
|
int ret;
|
|
int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
|
|
u64 transid = 0;
|
|
u64 bytenr;
|
|
|
|
if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
|
|
ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
|
|
/* real error */
|
|
if (ret < 0)
|
|
return -errno;
|
|
|
|
/* Not large enough sb, return -ENOENT instead of normal -EIO */
|
|
if (ret < BTRFS_SUPER_INFO_SIZE)
|
|
return -ENOENT;
|
|
|
|
if (btrfs_super_bytenr(buf) != sb_bytenr)
|
|
return -EIO;
|
|
|
|
ret = check_super(buf, sbflags);
|
|
if (ret < 0)
|
|
return ret;
|
|
memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* we would like to check all the supers, but that would make
|
|
* a btrfs mount succeed after a mkfs from a different FS.
|
|
* So, we need to add a special mount option to scan for
|
|
* later supers, using BTRFS_SUPER_MIRROR_MAX instead
|
|
*/
|
|
|
|
for (i = 0; i < max_super; i++) {
|
|
bytenr = btrfs_sb_offset(i);
|
|
ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
|
|
if (ret < BTRFS_SUPER_INFO_SIZE)
|
|
break;
|
|
|
|
if (btrfs_super_bytenr(buf) != bytenr )
|
|
continue;
|
|
/* if magic is NULL, the device was removed */
|
|
if (btrfs_super_magic(buf) == 0 && i == 0)
|
|
break;
|
|
if (check_super(buf, sbflags))
|
|
continue;
|
|
|
|
if (!fsid_is_initialized) {
|
|
memcpy(fsid, buf->fsid, sizeof(fsid));
|
|
fsid_is_initialized = 1;
|
|
} else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
|
|
/*
|
|
* the superblocks (the original one and
|
|
* its backups) contain data of different
|
|
* filesystems -> the super cannot be trusted
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
if (btrfs_super_generation(buf) > transid) {
|
|
memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
|
|
transid = btrfs_super_generation(buf);
|
|
}
|
|
}
|
|
|
|
return transid > 0 ? 0 : -1;
|
|
}
|
|
|
|
static int write_dev_supers(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_super_block *sb,
|
|
struct btrfs_device *device)
|
|
{
|
|
u64 bytenr;
|
|
u32 crc;
|
|
int i, ret;
|
|
|
|
if (fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
|
|
btrfs_set_super_bytenr(sb, fs_info->super_bytenr);
|
|
crc = ~(u32)0;
|
|
crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
|
|
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
|
|
btrfs_csum_final(crc, &sb->csum[0]);
|
|
|
|
/*
|
|
* super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
|
|
* zero filled, we can use it directly
|
|
*/
|
|
ret = pwrite64(device->fd, fs_info->super_copy,
|
|
BTRFS_SUPER_INFO_SIZE,
|
|
fs_info->super_bytenr);
|
|
if (ret != BTRFS_SUPER_INFO_SIZE)
|
|
goto write_err;
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
|
|
bytenr = btrfs_sb_offset(i);
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
|
|
break;
|
|
|
|
btrfs_set_super_bytenr(sb, bytenr);
|
|
|
|
crc = ~(u32)0;
|
|
crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
|
|
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
|
|
btrfs_csum_final(crc, &sb->csum[0]);
|
|
|
|
/*
|
|
* super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
|
|
* zero filled, we can use it directly
|
|
*/
|
|
ret = pwrite64(device->fd, fs_info->super_copy,
|
|
BTRFS_SUPER_INFO_SIZE, bytenr);
|
|
if (ret != BTRFS_SUPER_INFO_SIZE)
|
|
goto write_err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
write_err:
|
|
if (ret > 0)
|
|
fprintf(stderr, "WARNING: failed to write all sb data\n");
|
|
else
|
|
fprintf(stderr, "WARNING: failed to write sb: %m\n");
|
|
return ret;
|
|
}
|
|
|
|
int write_all_supers(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct list_head *head = &fs_info->fs_devices->devices;
|
|
struct btrfs_device *dev;
|
|
struct btrfs_super_block *sb;
|
|
struct btrfs_dev_item *dev_item;
|
|
int ret;
|
|
u64 flags;
|
|
|
|
sb = fs_info->super_copy;
|
|
dev_item = &sb->dev_item;
|
|
list_for_each_entry(dev, head, dev_list) {
|
|
if (!dev->writeable)
|
|
continue;
|
|
|
|
btrfs_set_stack_device_generation(dev_item, 0);
|
|
btrfs_set_stack_device_type(dev_item, dev->type);
|
|
btrfs_set_stack_device_id(dev_item, dev->devid);
|
|
btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
|
|
btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
|
|
btrfs_set_stack_device_io_align(dev_item, dev->io_align);
|
|
btrfs_set_stack_device_io_width(dev_item, dev->io_width);
|
|
btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
|
|
memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
|
|
memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
|
|
|
|
flags = btrfs_super_flags(sb);
|
|
btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
|
|
|
|
ret = write_dev_supers(fs_info, sb, dev);
|
|
BUG_ON(ret);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int write_ctree_super(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *chunk_root = fs_info->chunk_root;
|
|
|
|
if (fs_info->readonly)
|
|
return 0;
|
|
|
|
btrfs_set_super_generation(fs_info->super_copy,
|
|
trans->transid);
|
|
btrfs_set_super_root(fs_info->super_copy,
|
|
tree_root->node->start);
|
|
btrfs_set_super_root_level(fs_info->super_copy,
|
|
btrfs_header_level(tree_root->node));
|
|
btrfs_set_super_chunk_root(fs_info->super_copy,
|
|
chunk_root->node->start);
|
|
btrfs_set_super_chunk_root_level(fs_info->super_copy,
|
|
btrfs_header_level(chunk_root->node));
|
|
btrfs_set_super_chunk_root_generation(fs_info->super_copy,
|
|
btrfs_header_generation(chunk_root->node));
|
|
|
|
ret = write_all_supers(fs_info);
|
|
if (ret)
|
|
fprintf(stderr, "failed to write new super block err %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret;
|
|
int err = 0;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
|
|
if (fs_info->last_trans_committed !=
|
|
fs_info->generation) {
|
|
BUG_ON(!root);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
goto skip_commit;
|
|
}
|
|
btrfs_commit_transaction(trans, root);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
BUG_ON(IS_ERR(trans));
|
|
ret = commit_tree_roots(trans, fs_info);
|
|
BUG_ON(ret);
|
|
ret = __commit_transaction(trans, root);
|
|
BUG_ON(ret);
|
|
write_ctree_super(trans, fs_info);
|
|
kfree(trans);
|
|
}
|
|
|
|
if (fs_info->finalize_on_close) {
|
|
btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
|
|
root->fs_info->finalize_on_close = 0;
|
|
ret = write_all_supers(fs_info);
|
|
if (ret)
|
|
fprintf(stderr,
|
|
"failed to write new super block err %d\n", ret);
|
|
}
|
|
|
|
skip_commit:
|
|
btrfs_free_block_groups(fs_info);
|
|
|
|
free_fs_roots_tree(&fs_info->fs_root_tree);
|
|
|
|
btrfs_release_all_roots(fs_info);
|
|
ret = btrfs_close_devices(fs_info->fs_devices);
|
|
btrfs_cleanup_all_caches(fs_info);
|
|
btrfs_free_fs_info(fs_info);
|
|
if (!err)
|
|
err = ret;
|
|
return err;
|
|
}
|
|
|
|
int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
struct extent_buffer *eb)
|
|
{
|
|
return clear_extent_buffer_dirty(eb);
|
|
}
|
|
|
|
void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
|
|
{
|
|
set_extent_buffer_dirty(eb);
|
|
}
|
|
|
|
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
|
|
{
|
|
int ret;
|
|
|
|
ret = extent_buffer_uptodate(buf);
|
|
if (!ret)
|
|
return ret;
|
|
|
|
ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
|
|
return !ret;
|
|
}
|
|
|
|
int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
|
|
{
|
|
return set_extent_buffer_uptodate(eb);
|
|
}
|