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![Filipe Manana](/assets/img/avatar_default.png)
Getting the end offset for a file extent item requires a bit of code since the extent can be either inline or regular/prealloc. There are some places all over the code base that open code this logic and in another patch later in this series it will be needed again. Therefore encapsulate this logic in a helper function and use it. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
1116 lines
31 KiB
C
1116 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 embedded in btrfs_io_bio.
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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 btrfs_super_csum_size() used to return checksum. If
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* NULL, the checksum is returned in 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_io_bio *btrfs_bio = btrfs_io_bio(bio);
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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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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:
|
|
csum += count * csum_size;
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nblocks -= count;
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|
next:
|
|
while (count > 0) {
|
|
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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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;
|
|
LIST_HEAD(tmplist);
|
|
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) &&
|
|
IS_ALIGNED(end + 1, fs_info->sectorsize));
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
if (search_commit) {
|
|
path->skip_locking = 1;
|
|
path->reada = READA_FORWARD;
|
|
path->search_commit_root = 1;
|
|
}
|
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|
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key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key.offset = start;
|
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key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret > 0 && path->slots[0] > 0) {
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
|
|
if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
|
|
key.type == BTRFS_EXTENT_CSUM_KEY) {
|
|
offset = (start - key.offset) >>
|
|
fs_info->sb->s_blocksize_bits;
|
|
if (offset * csum_size <
|
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btrfs_item_size_nr(leaf, path->slots[0] - 1))
|
|
path->slots[0]--;
|
|
}
|
|
}
|
|
|
|
while (start <= end) {
|
|
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;
|
|
}
|
|
|
|
crypto_shash_init(shash);
|
|
data = kmap_atomic(bvec.bv_page);
|
|
crypto_shash_update(shash, data + bvec.bv_offset
|
|
+ (i * fs_info->sectorsize),
|
|
fs_info->sectorsize);
|
|
kunmap_atomic(data);
|
|
crypto_shash_final(shash, (char *)(sums->sums + index));
|
|
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 fail_unlock;
|
|
|
|
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 == 1)
|
|
found_next = 1;
|
|
if (ret != 0)
|
|
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 an item, but it isn't big
|
|
* enough yet to put our csum in. Grow it
|
|
*/
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot(trans, root, &file_key, path,
|
|
csum_size, 1);
|
|
if (ret < 0)
|
|
goto fail_unlock;
|
|
|
|
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;
|
|
}
|
|
|
|
if (csum_offset == btrfs_item_size_nr(leaf, path->slots[0]) /
|
|
csum_size) {
|
|
int extend_nr;
|
|
u64 tmp;
|
|
u32 diff;
|
|
u32 free_space;
|
|
|
|
if (btrfs_leaf_free_space(leaf) <
|
|
sizeof(struct btrfs_item) + csum_size * 2)
|
|
goto insert;
|
|
|
|
free_space = btrfs_leaf_free_space(leaf) -
|
|
sizeof(struct btrfs_item) - csum_size;
|
|
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(free_space, 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 fail_unlock;
|
|
if (WARN_ON(ret != 0))
|
|
goto fail_unlock;
|
|
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;
|
|
|
|
fail_unlock:
|
|
goto out;
|
|
}
|
|
|
|
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;
|
|
}
|