forked from Minki/linux
918cdf4423
The label 'fail_unlock' is pointless, all it does is to jump to the label 'out', so just remove it. Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
1125 lines
31 KiB
C
1125 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#include <linux/bio.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/sched/mm.h>
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#include <crypto/hash.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 "volumes.h"
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#include "print-tree.h"
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#include "compression.h"
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#define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \
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sizeof(struct btrfs_item) * 2) / \
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size) - 1))
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#define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \
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PAGE_SIZE))
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/**
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* @inode - the inode we want to update the disk_i_size for
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* @new_i_size - the i_size we want to set to, 0 if we use i_size
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*
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* With NO_HOLES set this simply sets the disk_is_size to whatever i_size_read()
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* returns as it is perfectly fine with a file that has holes without hole file
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* extent items.
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*
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* However without NO_HOLES we need to only return the area that is contiguous
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* from the 0 offset of the file. Otherwise we could end up adjust i_size up
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* to an extent that has a gap in between.
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*
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* Finally new_i_size should only be set in the case of truncate where we're not
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* ready to use i_size_read() as the limiter yet.
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*/
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void btrfs_inode_safe_disk_i_size_write(struct inode *inode, u64 new_i_size)
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{
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struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
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u64 start, end, i_size;
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int ret;
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i_size = new_i_size ?: i_size_read(inode);
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if (btrfs_fs_incompat(fs_info, NO_HOLES)) {
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BTRFS_I(inode)->disk_i_size = i_size;
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return;
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}
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spin_lock(&BTRFS_I(inode)->lock);
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ret = find_contiguous_extent_bit(&BTRFS_I(inode)->file_extent_tree, 0,
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&start, &end, EXTENT_DIRTY);
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if (!ret && start == 0)
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i_size = min(i_size, end + 1);
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else
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i_size = 0;
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BTRFS_I(inode)->disk_i_size = i_size;
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spin_unlock(&BTRFS_I(inode)->lock);
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}
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/**
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* @inode - the inode we're modifying
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* @start - the start file offset of the file extent we've inserted
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* @len - the logical length of the file extent item
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*
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* Call when we are inserting a new file extent where there was none before.
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* Does not need to call this in the case where we're replacing an existing file
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* extent, however if not sure it's fine to call this multiple times.
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*
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* The start and len must match the file extent item, so thus must be sectorsize
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* aligned.
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*/
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int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
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u64 len)
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{
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if (len == 0)
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return 0;
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ASSERT(IS_ALIGNED(start + len, inode->root->fs_info->sectorsize));
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if (btrfs_fs_incompat(inode->root->fs_info, NO_HOLES))
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return 0;
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return set_extent_bits(&inode->file_extent_tree, start, start + len - 1,
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EXTENT_DIRTY);
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}
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/**
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* @inode - the inode we're modifying
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* @start - the start file offset of the file extent we've inserted
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* @len - the logical length of the file extent item
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*
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* Called when we drop a file extent, for example when we truncate. Doesn't
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* need to be called for cases where we're replacing a file extent, like when
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* we've COWed a file extent.
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*
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* The start and len must match the file extent item, so thus must be sectorsize
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* aligned.
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*/
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int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
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u64 len)
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{
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if (len == 0)
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return 0;
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ASSERT(IS_ALIGNED(start + len, inode->root->fs_info->sectorsize) ||
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len == (u64)-1);
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if (btrfs_fs_incompat(inode->root->fs_info, NO_HOLES))
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return 0;
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return clear_extent_bit(&inode->file_extent_tree, start,
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start + len - 1, EXTENT_DIRTY, 0, 0, NULL);
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}
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static inline u32 max_ordered_sum_bytes(struct btrfs_fs_info *fs_info,
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u16 csum_size)
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{
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u32 ncsums = (PAGE_SIZE - sizeof(struct btrfs_ordered_sum)) / csum_size;
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return ncsums * fs_info->sectorsize;
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}
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int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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u64 objectid, u64 pos,
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u64 disk_offset, u64 disk_num_bytes,
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u64 num_bytes, u64 offset, u64 ram_bytes,
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u8 compression, u8 encryption, u16 other_encoding)
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{
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int ret = 0;
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struct btrfs_file_extent_item *item;
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struct btrfs_key file_key;
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struct btrfs_path *path;
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struct extent_buffer *leaf;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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file_key.objectid = objectid;
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file_key.offset = pos;
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file_key.type = BTRFS_EXTENT_DATA_KEY;
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path->leave_spinning = 1;
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ret = btrfs_insert_empty_item(trans, root, path, &file_key,
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sizeof(*item));
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if (ret < 0)
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goto out;
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BUG_ON(ret); /* Can't happen */
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leaf = path->nodes[0];
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item = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_file_extent_item);
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btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset);
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btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
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btrfs_set_file_extent_offset(leaf, item, offset);
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btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
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btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes);
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btrfs_set_file_extent_generation(leaf, item, trans->transid);
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btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
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btrfs_set_file_extent_compression(leaf, item, compression);
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btrfs_set_file_extent_encryption(leaf, item, encryption);
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btrfs_set_file_extent_other_encoding(leaf, item, other_encoding);
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btrfs_mark_buffer_dirty(leaf);
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out:
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btrfs_free_path(path);
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return ret;
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}
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static struct btrfs_csum_item *
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btrfs_lookup_csum(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path,
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u64 bytenr, int cow)
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{
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struct btrfs_fs_info *fs_info = root->fs_info;
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int ret;
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struct btrfs_key file_key;
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struct btrfs_key found_key;
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struct btrfs_csum_item *item;
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struct extent_buffer *leaf;
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u64 csum_offset = 0;
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u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
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int csums_in_item;
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file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
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file_key.offset = bytenr;
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file_key.type = BTRFS_EXTENT_CSUM_KEY;
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ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
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if (ret < 0)
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goto fail;
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leaf = path->nodes[0];
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if (ret > 0) {
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ret = 1;
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if (path->slots[0] == 0)
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goto fail;
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path->slots[0]--;
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btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
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if (found_key.type != BTRFS_EXTENT_CSUM_KEY)
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goto fail;
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csum_offset = (bytenr - found_key.offset) >>
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fs_info->sb->s_blocksize_bits;
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csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
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csums_in_item /= csum_size;
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if (csum_offset == csums_in_item) {
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ret = -EFBIG;
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goto fail;
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} else if (csum_offset > csums_in_item) {
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goto fail;
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}
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}
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item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
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item = (struct btrfs_csum_item *)((unsigned char *)item +
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csum_offset * csum_size);
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return item;
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fail:
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if (ret > 0)
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ret = -ENOENT;
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return ERR_PTR(ret);
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}
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int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, u64 objectid,
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u64 offset, int mod)
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{
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int ret;
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struct btrfs_key file_key;
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int ins_len = mod < 0 ? -1 : 0;
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int cow = mod != 0;
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file_key.objectid = objectid;
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file_key.offset = offset;
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file_key.type = BTRFS_EXTENT_DATA_KEY;
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ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
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return ret;
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}
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/**
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* btrfs_lookup_bio_sums - Look up checksums for a bio.
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* @inode: inode that the bio is for.
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* @bio: bio to look up.
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* @offset: Unless (u64)-1, look up checksums for this offset in the file.
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* If (u64)-1, use the page offsets from the bio instead.
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* @dst: Buffer of size nblocks * btrfs_super_csum_size() used to return
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* checksum (nblocks = bio->bi_iter.bi_size / fs_info->sectorsize). If
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* NULL, the checksum buffer is allocated and returned in
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* btrfs_io_bio(bio)->csum instead.
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*
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* Return: BLK_STS_RESOURCE if allocating memory fails, BLK_STS_OK otherwise.
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*/
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blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio,
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u64 offset, u8 *dst)
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{
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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struct bio_vec bvec;
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struct bvec_iter iter;
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struct btrfs_csum_item *item = NULL;
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struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
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struct btrfs_path *path;
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const bool page_offsets = (offset == (u64)-1);
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u8 *csum;
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u64 item_start_offset = 0;
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u64 item_last_offset = 0;
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u64 disk_bytenr;
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u64 page_bytes_left;
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u32 diff;
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int nblocks;
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int count = 0;
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u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
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path = btrfs_alloc_path();
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if (!path)
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return BLK_STS_RESOURCE;
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nblocks = bio->bi_iter.bi_size >> inode->i_sb->s_blocksize_bits;
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if (!dst) {
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struct btrfs_io_bio *btrfs_bio = btrfs_io_bio(bio);
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if (nblocks * csum_size > BTRFS_BIO_INLINE_CSUM_SIZE) {
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btrfs_bio->csum = kmalloc_array(nblocks, csum_size,
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GFP_NOFS);
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if (!btrfs_bio->csum) {
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btrfs_free_path(path);
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return BLK_STS_RESOURCE;
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}
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} else {
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btrfs_bio->csum = btrfs_bio->csum_inline;
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}
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csum = btrfs_bio->csum;
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} else {
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csum = dst;
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}
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if (bio->bi_iter.bi_size > PAGE_SIZE * 8)
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path->reada = READA_FORWARD;
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/*
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* the free space stuff is only read when it hasn't been
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* updated in the current transaction. So, we can safely
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* read from the commit root and sidestep a nasty deadlock
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* between reading the free space cache and updating the csum tree.
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*/
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if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
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path->search_commit_root = 1;
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path->skip_locking = 1;
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}
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disk_bytenr = (u64)bio->bi_iter.bi_sector << 9;
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bio_for_each_segment(bvec, bio, iter) {
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page_bytes_left = bvec.bv_len;
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if (count)
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goto next;
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if (page_offsets)
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offset = page_offset(bvec.bv_page) + bvec.bv_offset;
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count = btrfs_find_ordered_sum(inode, offset, disk_bytenr,
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csum, nblocks);
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if (count)
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goto found;
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if (!item || disk_bytenr < item_start_offset ||
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disk_bytenr >= item_last_offset) {
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struct btrfs_key found_key;
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u32 item_size;
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if (item)
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btrfs_release_path(path);
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item = btrfs_lookup_csum(NULL, fs_info->csum_root,
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path, disk_bytenr, 0);
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if (IS_ERR(item)) {
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count = 1;
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memset(csum, 0, csum_size);
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if (BTRFS_I(inode)->root->root_key.objectid ==
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BTRFS_DATA_RELOC_TREE_OBJECTID) {
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set_extent_bits(io_tree, offset,
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offset + fs_info->sectorsize - 1,
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EXTENT_NODATASUM);
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} else {
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btrfs_info_rl(fs_info,
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"no csum found for inode %llu start %llu",
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btrfs_ino(BTRFS_I(inode)), offset);
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}
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item = NULL;
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btrfs_release_path(path);
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goto found;
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}
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btrfs_item_key_to_cpu(path->nodes[0], &found_key,
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path->slots[0]);
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item_start_offset = found_key.offset;
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item_size = btrfs_item_size_nr(path->nodes[0],
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path->slots[0]);
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item_last_offset = item_start_offset +
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(item_size / csum_size) *
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fs_info->sectorsize;
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item = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_csum_item);
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}
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/*
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* this byte range must be able to fit inside
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* a single leaf so it will also fit inside a u32
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*/
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diff = disk_bytenr - item_start_offset;
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diff = diff / fs_info->sectorsize;
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diff = diff * csum_size;
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count = min_t(int, nblocks, (item_last_offset - disk_bytenr) >>
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inode->i_sb->s_blocksize_bits);
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read_extent_buffer(path->nodes[0], csum,
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((unsigned long)item) + diff,
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csum_size * count);
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found:
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csum += count * csum_size;
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nblocks -= count;
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next:
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while (count > 0) {
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count--;
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disk_bytenr += fs_info->sectorsize;
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offset += fs_info->sectorsize;
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page_bytes_left -= fs_info->sectorsize;
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if (!page_bytes_left)
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break; /* move to next bio */
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}
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}
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|
|
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WARN_ON_ONCE(count);
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btrfs_free_path(path);
|
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return BLK_STS_OK;
|
|
}
|
|
|
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int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
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struct list_head *list, int search_commit)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
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struct btrfs_key key;
|
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struct btrfs_path *path;
|
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struct extent_buffer *leaf;
|
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struct btrfs_ordered_sum *sums;
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struct btrfs_csum_item *item;
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LIST_HEAD(tmplist);
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|
unsigned long offset;
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int ret;
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|
size_t size;
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u64 csum_end;
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u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
|
|
|
|
ASSERT(IS_ALIGNED(start, fs_info->sectorsize) &&
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IS_ALIGNED(end + 1, fs_info->sectorsize));
|
|
|
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path = btrfs_alloc_path();
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|
if (!path)
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|
return -ENOMEM;
|
|
|
|
if (search_commit) {
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path->skip_locking = 1;
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|
path->reada = READA_FORWARD;
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path->search_commit_root = 1;
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}
|
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|
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key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
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key.offset = start;
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key.type = BTRFS_EXTENT_CSUM_KEY;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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|
if (ret < 0)
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goto fail;
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|
if (ret > 0 && path->slots[0] > 0) {
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leaf = path->nodes[0];
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btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
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if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
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key.type == BTRFS_EXTENT_CSUM_KEY) {
|
|
offset = (start - key.offset) >>
|
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fs_info->sb->s_blocksize_bits;
|
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if (offset * csum_size <
|
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btrfs_item_size_nr(leaf, path->slots[0] - 1))
|
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path->slots[0]--;
|
|
}
|
|
}
|
|
|
|
while (start <= end) {
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|
leaf = path->nodes[0];
|
|
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret > 0)
|
|
break;
|
|
leaf = path->nodes[0];
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
key.type != BTRFS_EXTENT_CSUM_KEY ||
|
|
key.offset > end)
|
|
break;
|
|
|
|
if (key.offset > start)
|
|
start = key.offset;
|
|
|
|
size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
csum_end = key.offset + (size / csum_size) * fs_info->sectorsize;
|
|
if (csum_end <= start) {
|
|
path->slots[0]++;
|
|
continue;
|
|
}
|
|
|
|
csum_end = min(csum_end, end + 1);
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_csum_item);
|
|
while (start < csum_end) {
|
|
size = min_t(size_t, csum_end - start,
|
|
max_ordered_sum_bytes(fs_info, csum_size));
|
|
sums = kzalloc(btrfs_ordered_sum_size(fs_info, size),
|
|
GFP_NOFS);
|
|
if (!sums) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
sums->bytenr = start;
|
|
sums->len = (int)size;
|
|
|
|
offset = (start - key.offset) >>
|
|
fs_info->sb->s_blocksize_bits;
|
|
offset *= csum_size;
|
|
size >>= fs_info->sb->s_blocksize_bits;
|
|
|
|
read_extent_buffer(path->nodes[0],
|
|
sums->sums,
|
|
((unsigned long)item) + offset,
|
|
csum_size * size);
|
|
|
|
start += fs_info->sectorsize * size;
|
|
list_add_tail(&sums->list, &tmplist);
|
|
}
|
|
path->slots[0]++;
|
|
}
|
|
ret = 0;
|
|
fail:
|
|
while (ret < 0 && !list_empty(&tmplist)) {
|
|
sums = list_entry(tmplist.next, struct btrfs_ordered_sum, list);
|
|
list_del(&sums->list);
|
|
kfree(sums);
|
|
}
|
|
list_splice_tail(&tmplist, list);
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* btrfs_csum_one_bio - Calculates checksums of the data contained inside a bio
|
|
* @inode: Owner of the data inside the bio
|
|
* @bio: Contains the data to be checksummed
|
|
* @file_start: offset in file this bio begins to describe
|
|
* @contig: Boolean. If true/1 means all bio vecs in this bio are
|
|
* contiguous and they begin at @file_start in the file. False/0
|
|
* means this bio can contains potentially discontigous bio vecs
|
|
* so the logical offset of each should be calculated separately.
|
|
*/
|
|
blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
|
|
u64 file_start, int contig)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
|
|
struct btrfs_ordered_sum *sums;
|
|
struct btrfs_ordered_extent *ordered = NULL;
|
|
char *data;
|
|
struct bvec_iter iter;
|
|
struct bio_vec bvec;
|
|
int index;
|
|
int nr_sectors;
|
|
unsigned long total_bytes = 0;
|
|
unsigned long this_sum_bytes = 0;
|
|
int i;
|
|
u64 offset;
|
|
unsigned nofs_flag;
|
|
const u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
sums = kvzalloc(btrfs_ordered_sum_size(fs_info, bio->bi_iter.bi_size),
|
|
GFP_KERNEL);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
|
|
if (!sums)
|
|
return BLK_STS_RESOURCE;
|
|
|
|
sums->len = bio->bi_iter.bi_size;
|
|
INIT_LIST_HEAD(&sums->list);
|
|
|
|
if (contig)
|
|
offset = file_start;
|
|
else
|
|
offset = 0; /* shut up gcc */
|
|
|
|
sums->bytenr = (u64)bio->bi_iter.bi_sector << 9;
|
|
index = 0;
|
|
|
|
shash->tfm = fs_info->csum_shash;
|
|
|
|
bio_for_each_segment(bvec, bio, iter) {
|
|
if (!contig)
|
|
offset = page_offset(bvec.bv_page) + bvec.bv_offset;
|
|
|
|
if (!ordered) {
|
|
ordered = btrfs_lookup_ordered_extent(inode, offset);
|
|
BUG_ON(!ordered); /* Logic error */
|
|
}
|
|
|
|
nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info,
|
|
bvec.bv_len + fs_info->sectorsize
|
|
- 1);
|
|
|
|
for (i = 0; i < nr_sectors; i++) {
|
|
if (offset >= ordered->file_offset + ordered->num_bytes ||
|
|
offset < ordered->file_offset) {
|
|
unsigned long bytes_left;
|
|
|
|
sums->len = this_sum_bytes;
|
|
this_sum_bytes = 0;
|
|
btrfs_add_ordered_sum(ordered, sums);
|
|
btrfs_put_ordered_extent(ordered);
|
|
|
|
bytes_left = bio->bi_iter.bi_size - total_bytes;
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
sums = kvzalloc(btrfs_ordered_sum_size(fs_info,
|
|
bytes_left), GFP_KERNEL);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
BUG_ON(!sums); /* -ENOMEM */
|
|
sums->len = bytes_left;
|
|
ordered = btrfs_lookup_ordered_extent(inode,
|
|
offset);
|
|
ASSERT(ordered); /* Logic error */
|
|
sums->bytenr = ((u64)bio->bi_iter.bi_sector << 9)
|
|
+ total_bytes;
|
|
index = 0;
|
|
}
|
|
|
|
data = kmap_atomic(bvec.bv_page);
|
|
crypto_shash_digest(shash, data + bvec.bv_offset
|
|
+ (i * fs_info->sectorsize),
|
|
fs_info->sectorsize,
|
|
sums->sums + index);
|
|
kunmap_atomic(data);
|
|
index += csum_size;
|
|
offset += fs_info->sectorsize;
|
|
this_sum_bytes += fs_info->sectorsize;
|
|
total_bytes += fs_info->sectorsize;
|
|
}
|
|
|
|
}
|
|
this_sum_bytes = 0;
|
|
btrfs_add_ordered_sum(ordered, sums);
|
|
btrfs_put_ordered_extent(ordered);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* helper function for csum removal, this expects the
|
|
* key to describe the csum pointed to by the path, and it expects
|
|
* the csum to overlap the range [bytenr, len]
|
|
*
|
|
* The csum should not be entirely contained in the range and the
|
|
* range should not be entirely contained in the csum.
|
|
*
|
|
* This calls btrfs_truncate_item with the correct args based on the
|
|
* overlap, and fixes up the key as required.
|
|
*/
|
|
static noinline void truncate_one_csum(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *key,
|
|
u64 bytenr, u64 len)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
|
|
u64 csum_end;
|
|
u64 end_byte = bytenr + len;
|
|
u32 blocksize_bits = fs_info->sb->s_blocksize_bits;
|
|
|
|
leaf = path->nodes[0];
|
|
csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
|
|
csum_end <<= fs_info->sb->s_blocksize_bits;
|
|
csum_end += key->offset;
|
|
|
|
if (key->offset < bytenr && csum_end <= end_byte) {
|
|
/*
|
|
* [ bytenr - len ]
|
|
* [ ]
|
|
* [csum ]
|
|
* A simple truncate off the end of the item
|
|
*/
|
|
u32 new_size = (bytenr - key->offset) >> blocksize_bits;
|
|
new_size *= csum_size;
|
|
btrfs_truncate_item(path, new_size, 1);
|
|
} else if (key->offset >= bytenr && csum_end > end_byte &&
|
|
end_byte > key->offset) {
|
|
/*
|
|
* [ bytenr - len ]
|
|
* [ ]
|
|
* [csum ]
|
|
* we need to truncate from the beginning of the csum
|
|
*/
|
|
u32 new_size = (csum_end - end_byte) >> blocksize_bits;
|
|
new_size *= csum_size;
|
|
|
|
btrfs_truncate_item(path, new_size, 0);
|
|
|
|
key->offset = end_byte;
|
|
btrfs_set_item_key_safe(fs_info, path, key);
|
|
} else {
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* deletes the csum items from the csum tree for a given
|
|
* range of bytes.
|
|
*/
|
|
int btrfs_del_csums(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 bytenr, u64 len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
u64 end_byte = bytenr + len;
|
|
u64 csum_end;
|
|
struct extent_buffer *leaf;
|
|
int ret;
|
|
u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
|
|
int blocksize_bits = fs_info->sb->s_blocksize_bits;
|
|
|
|
ASSERT(root == fs_info->csum_root ||
|
|
root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
while (1) {
|
|
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key.offset = end_byte - 1;
|
|
key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0) {
|
|
if (path->slots[0] == 0)
|
|
break;
|
|
path->slots[0]--;
|
|
} else if (ret < 0) {
|
|
break;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
|
|
if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
key.type != BTRFS_EXTENT_CSUM_KEY) {
|
|
break;
|
|
}
|
|
|
|
if (key.offset >= end_byte)
|
|
break;
|
|
|
|
csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
|
|
csum_end <<= blocksize_bits;
|
|
csum_end += key.offset;
|
|
|
|
/* this csum ends before we start, we're done */
|
|
if (csum_end <= bytenr)
|
|
break;
|
|
|
|
/* delete the entire item, it is inside our range */
|
|
if (key.offset >= bytenr && csum_end <= end_byte) {
|
|
int del_nr = 1;
|
|
|
|
/*
|
|
* Check how many csum items preceding this one in this
|
|
* leaf correspond to our range and then delete them all
|
|
* at once.
|
|
*/
|
|
if (key.offset > bytenr && path->slots[0] > 0) {
|
|
int slot = path->slots[0] - 1;
|
|
|
|
while (slot >= 0) {
|
|
struct btrfs_key pk;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &pk, slot);
|
|
if (pk.offset < bytenr ||
|
|
pk.type != BTRFS_EXTENT_CSUM_KEY ||
|
|
pk.objectid !=
|
|
BTRFS_EXTENT_CSUM_OBJECTID)
|
|
break;
|
|
path->slots[0] = slot;
|
|
del_nr++;
|
|
key.offset = pk.offset;
|
|
slot--;
|
|
}
|
|
}
|
|
ret = btrfs_del_items(trans, root, path,
|
|
path->slots[0], del_nr);
|
|
if (ret)
|
|
goto out;
|
|
if (key.offset == bytenr)
|
|
break;
|
|
} else if (key.offset < bytenr && csum_end > end_byte) {
|
|
unsigned long offset;
|
|
unsigned long shift_len;
|
|
unsigned long item_offset;
|
|
/*
|
|
* [ bytenr - len ]
|
|
* [csum ]
|
|
*
|
|
* Our bytes are in the middle of the csum,
|
|
* we need to split this item and insert a new one.
|
|
*
|
|
* But we can't drop the path because the
|
|
* csum could change, get removed, extended etc.
|
|
*
|
|
* The trick here is the max size of a csum item leaves
|
|
* enough room in the tree block for a single
|
|
* item header. So, we split the item in place,
|
|
* adding a new header pointing to the existing
|
|
* bytes. Then we loop around again and we have
|
|
* a nicely formed csum item that we can neatly
|
|
* truncate.
|
|
*/
|
|
offset = (bytenr - key.offset) >> blocksize_bits;
|
|
offset *= csum_size;
|
|
|
|
shift_len = (len >> blocksize_bits) * csum_size;
|
|
|
|
item_offset = btrfs_item_ptr_offset(leaf,
|
|
path->slots[0]);
|
|
|
|
memzero_extent_buffer(leaf, item_offset + offset,
|
|
shift_len);
|
|
key.offset = bytenr;
|
|
|
|
/*
|
|
* btrfs_split_item returns -EAGAIN when the
|
|
* item changed size or key
|
|
*/
|
|
ret = btrfs_split_item(trans, root, path, &key, offset);
|
|
if (ret && ret != -EAGAIN) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
key.offset = end_byte - 1;
|
|
} else {
|
|
truncate_one_csum(fs_info, path, &key, bytenr, len);
|
|
if (key.offset < bytenr)
|
|
break;
|
|
}
|
|
btrfs_release_path(path);
|
|
}
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_ordered_sum *sums)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_key file_key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_path *path;
|
|
struct btrfs_csum_item *item;
|
|
struct btrfs_csum_item *item_end;
|
|
struct extent_buffer *leaf = NULL;
|
|
u64 next_offset;
|
|
u64 total_bytes = 0;
|
|
u64 csum_offset;
|
|
u64 bytenr;
|
|
u32 nritems;
|
|
u32 ins_size;
|
|
int index = 0;
|
|
int found_next;
|
|
int ret;
|
|
u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
again:
|
|
next_offset = (u64)-1;
|
|
found_next = 0;
|
|
bytenr = sums->bytenr + total_bytes;
|
|
file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
file_key.offset = bytenr;
|
|
file_key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
|
|
item = btrfs_lookup_csum(trans, root, path, bytenr, 1);
|
|
if (!IS_ERR(item)) {
|
|
ret = 0;
|
|
leaf = path->nodes[0];
|
|
item_end = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_csum_item);
|
|
item_end = (struct btrfs_csum_item *)((char *)item_end +
|
|
btrfs_item_size_nr(leaf, path->slots[0]));
|
|
goto found;
|
|
}
|
|
ret = PTR_ERR(item);
|
|
if (ret != -EFBIG && ret != -ENOENT)
|
|
goto out;
|
|
|
|
if (ret == -EFBIG) {
|
|
u32 item_size;
|
|
/* we found one, but it isn't big enough yet */
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
if ((item_size / csum_size) >=
|
|
MAX_CSUM_ITEMS(fs_info, csum_size)) {
|
|
/* already at max size, make a new one */
|
|
goto insert;
|
|
}
|
|
} else {
|
|
int slot = path->slots[0] + 1;
|
|
/* we didn't find a csum item, insert one */
|
|
nritems = btrfs_header_nritems(path->nodes[0]);
|
|
if (!nritems || (path->slots[0] >= nritems - 1)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0) {
|
|
goto out;
|
|
} else if (ret > 0) {
|
|
found_next = 1;
|
|
goto insert;
|
|
}
|
|
slot = path->slots[0];
|
|
}
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
|
|
if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
found_key.type != BTRFS_EXTENT_CSUM_KEY) {
|
|
found_next = 1;
|
|
goto insert;
|
|
}
|
|
next_offset = found_key.offset;
|
|
found_next = 1;
|
|
goto insert;
|
|
}
|
|
|
|
/*
|
|
* At this point, we know the tree has a checksum item that ends at an
|
|
* offset matching the start of the checksum range we want to insert.
|
|
* We try to extend that item as much as possible and then add as many
|
|
* checksums to it as they fit.
|
|
*
|
|
* First check if the leaf has enough free space for at least one
|
|
* checksum. If it has go directly to the item extension code, otherwise
|
|
* release the path and do a search for insertion before the extension.
|
|
*/
|
|
if (btrfs_leaf_free_space(leaf) >= csum_size) {
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
csum_offset = (bytenr - found_key.offset) >>
|
|
fs_info->sb->s_blocksize_bits;
|
|
goto extend_csum;
|
|
}
|
|
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot(trans, root, &file_key, path,
|
|
csum_size, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
if (path->slots[0] == 0)
|
|
goto insert;
|
|
path->slots[0]--;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
csum_offset = (bytenr - found_key.offset) >>
|
|
fs_info->sb->s_blocksize_bits;
|
|
|
|
if (found_key.type != BTRFS_EXTENT_CSUM_KEY ||
|
|
found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
csum_offset >= MAX_CSUM_ITEMS(fs_info, csum_size)) {
|
|
goto insert;
|
|
}
|
|
|
|
extend_csum:
|
|
if (csum_offset == btrfs_item_size_nr(leaf, path->slots[0]) /
|
|
csum_size) {
|
|
int extend_nr;
|
|
u64 tmp;
|
|
u32 diff;
|
|
|
|
tmp = sums->len - total_bytes;
|
|
tmp >>= fs_info->sb->s_blocksize_bits;
|
|
WARN_ON(tmp < 1);
|
|
|
|
extend_nr = max_t(int, 1, (int)tmp);
|
|
diff = (csum_offset + extend_nr) * csum_size;
|
|
diff = min(diff,
|
|
MAX_CSUM_ITEMS(fs_info, csum_size) * csum_size);
|
|
|
|
diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
|
|
diff = min_t(u32, btrfs_leaf_free_space(leaf), diff);
|
|
diff /= csum_size;
|
|
diff *= csum_size;
|
|
|
|
btrfs_extend_item(path, diff);
|
|
ret = 0;
|
|
goto csum;
|
|
}
|
|
|
|
insert:
|
|
btrfs_release_path(path);
|
|
csum_offset = 0;
|
|
if (found_next) {
|
|
u64 tmp;
|
|
|
|
tmp = sums->len - total_bytes;
|
|
tmp >>= fs_info->sb->s_blocksize_bits;
|
|
tmp = min(tmp, (next_offset - file_key.offset) >>
|
|
fs_info->sb->s_blocksize_bits);
|
|
|
|
tmp = max_t(u64, 1, tmp);
|
|
tmp = min_t(u64, tmp, MAX_CSUM_ITEMS(fs_info, csum_size));
|
|
ins_size = csum_size * tmp;
|
|
} else {
|
|
ins_size = csum_size;
|
|
}
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
|
|
ins_size);
|
|
path->leave_spinning = 0;
|
|
if (ret < 0)
|
|
goto out;
|
|
if (WARN_ON(ret != 0))
|
|
goto out;
|
|
leaf = path->nodes[0];
|
|
csum:
|
|
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
|
|
item_end = (struct btrfs_csum_item *)((unsigned char *)item +
|
|
btrfs_item_size_nr(leaf, path->slots[0]));
|
|
item = (struct btrfs_csum_item *)((unsigned char *)item +
|
|
csum_offset * csum_size);
|
|
found:
|
|
ins_size = (u32)(sums->len - total_bytes) >>
|
|
fs_info->sb->s_blocksize_bits;
|
|
ins_size *= csum_size;
|
|
ins_size = min_t(u32, (unsigned long)item_end - (unsigned long)item,
|
|
ins_size);
|
|
write_extent_buffer(leaf, sums->sums + index, (unsigned long)item,
|
|
ins_size);
|
|
|
|
index += ins_size;
|
|
ins_size /= csum_size;
|
|
total_bytes += ins_size * fs_info->sectorsize;
|
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
if (total_bytes < sums->len) {
|
|
btrfs_release_path(path);
|
|
cond_resched();
|
|
goto again;
|
|
}
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
|
|
const struct btrfs_path *path,
|
|
struct btrfs_file_extent_item *fi,
|
|
const bool new_inline,
|
|
struct extent_map *em)
|
|
{
|
|
struct btrfs_fs_info *fs_info = inode->root->fs_info;
|
|
struct btrfs_root *root = inode->root;
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
const int slot = path->slots[0];
|
|
struct btrfs_key key;
|
|
u64 extent_start, extent_end;
|
|
u64 bytenr;
|
|
u8 type = btrfs_file_extent_type(leaf, fi);
|
|
int compress_type = btrfs_file_extent_compression(leaf, fi);
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
extent_start = key.offset;
|
|
extent_end = btrfs_file_extent_end(path);
|
|
em->ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
|
|
if (type == BTRFS_FILE_EXTENT_REG ||
|
|
type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
em->start = extent_start;
|
|
em->len = extent_end - extent_start;
|
|
em->orig_start = extent_start -
|
|
btrfs_file_extent_offset(leaf, fi);
|
|
em->orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi);
|
|
bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
|
|
if (bytenr == 0) {
|
|
em->block_start = EXTENT_MAP_HOLE;
|
|
return;
|
|
}
|
|
if (compress_type != BTRFS_COMPRESS_NONE) {
|
|
set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
|
|
em->compress_type = compress_type;
|
|
em->block_start = bytenr;
|
|
em->block_len = em->orig_block_len;
|
|
} else {
|
|
bytenr += btrfs_file_extent_offset(leaf, fi);
|
|
em->block_start = bytenr;
|
|
em->block_len = em->len;
|
|
if (type == BTRFS_FILE_EXTENT_PREALLOC)
|
|
set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
|
|
}
|
|
} else if (type == BTRFS_FILE_EXTENT_INLINE) {
|
|
em->block_start = EXTENT_MAP_INLINE;
|
|
em->start = extent_start;
|
|
em->len = extent_end - extent_start;
|
|
/*
|
|
* Initialize orig_start and block_len with the same values
|
|
* as in inode.c:btrfs_get_extent().
|
|
*/
|
|
em->orig_start = EXTENT_MAP_HOLE;
|
|
em->block_len = (u64)-1;
|
|
if (!new_inline && compress_type != BTRFS_COMPRESS_NONE) {
|
|
set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
|
|
em->compress_type = compress_type;
|
|
}
|
|
} else {
|
|
btrfs_err(fs_info,
|
|
"unknown file extent item type %d, inode %llu, offset %llu, "
|
|
"root %llu", type, btrfs_ino(inode), extent_start,
|
|
root->root_key.objectid);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns the end offset (non inclusive) of the file extent item the given path
|
|
* points to. If it points to an inline extent, the returned offset is rounded
|
|
* up to the sector size.
|
|
*/
|
|
u64 btrfs_file_extent_end(const struct btrfs_path *path)
|
|
{
|
|
const struct extent_buffer *leaf = path->nodes[0];
|
|
const int slot = path->slots[0];
|
|
struct btrfs_file_extent_item *fi;
|
|
struct btrfs_key key;
|
|
u64 end;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
ASSERT(key.type == BTRFS_EXTENT_DATA_KEY);
|
|
fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
|
|
|
|
if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_INLINE) {
|
|
end = btrfs_file_extent_ram_bytes(leaf, fi);
|
|
end = ALIGN(key.offset + end, leaf->fs_info->sectorsize);
|
|
} else {
|
|
end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
|
|
}
|
|
|
|
return end;
|
|
}
|