548 lines
15 KiB
C
548 lines
15 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/bio.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.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 "print-tree.h"
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#define MAX_CSUM_ITEMS(r,size) ((((BTRFS_LEAF_DATA_SIZE(r) - \
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sizeof(struct btrfs_item) * 2) / \
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size) - 1))
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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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BUG_ON(!path);
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file_key.objectid = objectid;
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file_key.offset = pos;
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btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
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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);
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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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struct btrfs_csum_item *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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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 =
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btrfs_super_csum_size(&root->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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btrfs_set_key_type(&file_key, 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 (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
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goto fail;
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csum_offset = (bytenr - found_key.offset) >>
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root->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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}
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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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btrfs_set_key_type(&file_key, 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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int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
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struct bio *bio, u32 *dst)
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{
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u32 sum;
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struct bio_vec *bvec = bio->bi_io_vec;
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int bio_index = 0;
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u64 offset;
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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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u32 diff;
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u16 csum_size =
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btrfs_super_csum_size(&root->fs_info->super_copy);
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int ret;
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struct btrfs_path *path;
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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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path = btrfs_alloc_path();
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if (bio->bi_size > PAGE_CACHE_SIZE * 8)
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path->reada = 2;
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WARN_ON(bio->bi_vcnt <= 0);
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disk_bytenr = (u64)bio->bi_sector << 9;
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while(bio_index < bio->bi_vcnt) {
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offset = page_offset(bvec->bv_page) + bvec->bv_offset;
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ret = btrfs_find_ordered_sum(inode, offset, disk_bytenr, &sum);
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if (ret == 0)
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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(root, path);
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item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
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path, disk_bytenr, 0);
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if (IS_ERR(item)) {
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ret = PTR_ERR(item);
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if (ret == -ENOENT || ret == -EFBIG)
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ret = 0;
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sum = 0;
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printk("no csum found for inode %lu start "
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"%llu\n", inode->i_ino,
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(unsigned long long)offset);
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item = NULL;
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btrfs_release_path(root, 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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root->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 / root->sectorsize;
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diff = diff * csum_size;
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read_extent_buffer(path->nodes[0], &sum,
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((unsigned long)item) + diff,
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csum_size);
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found:
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if (dst)
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*dst++ = sum;
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else
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set_state_private(io_tree, offset, sum);
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disk_bytenr += bvec->bv_len;
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bio_index++;
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bvec++;
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}
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btrfs_free_path(path);
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return 0;
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}
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int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
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struct bio *bio, u64 file_start, int contig)
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{
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struct btrfs_ordered_sum *sums;
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struct btrfs_sector_sum *sector_sum;
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struct btrfs_ordered_extent *ordered;
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char *data;
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struct bio_vec *bvec = bio->bi_io_vec;
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int bio_index = 0;
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unsigned long total_bytes = 0;
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unsigned long this_sum_bytes = 0;
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u64 offset;
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u64 disk_bytenr;
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WARN_ON(bio->bi_vcnt <= 0);
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sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
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if (!sums)
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return -ENOMEM;
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sector_sum = sums->sums;
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disk_bytenr = (u64)bio->bi_sector << 9;
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sums->len = bio->bi_size;
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INIT_LIST_HEAD(&sums->list);
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if (contig)
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offset = file_start;
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else
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offset = page_offset(bvec->bv_page) + bvec->bv_offset;
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ordered = btrfs_lookup_ordered_extent(inode, offset);
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BUG_ON(!ordered);
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sums->bytenr = ordered->start;
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while(bio_index < bio->bi_vcnt) {
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if (!contig)
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offset = page_offset(bvec->bv_page) + bvec->bv_offset;
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if (!contig && (offset >= ordered->file_offset + ordered->len ||
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offset < ordered->file_offset)) {
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unsigned long bytes_left;
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sums->len = this_sum_bytes;
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this_sum_bytes = 0;
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btrfs_add_ordered_sum(inode, ordered, sums);
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btrfs_put_ordered_extent(ordered);
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bytes_left = bio->bi_size - total_bytes;
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sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
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GFP_NOFS);
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BUG_ON(!sums);
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sector_sum = sums->sums;
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sums->len = bytes_left;
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ordered = btrfs_lookup_ordered_extent(inode, offset);
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BUG_ON(!ordered);
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sums->bytenr = ordered->start;
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}
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data = kmap_atomic(bvec->bv_page, KM_USER0);
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sector_sum->sum = ~(u32)0;
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sector_sum->sum = btrfs_csum_data(root,
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data + bvec->bv_offset,
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sector_sum->sum,
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bvec->bv_len);
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kunmap_atomic(data, KM_USER0);
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btrfs_csum_final(sector_sum->sum,
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(char *)§or_sum->sum);
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sector_sum->bytenr = disk_bytenr;
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sector_sum++;
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bio_index++;
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total_bytes += bvec->bv_len;
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this_sum_bytes += bvec->bv_len;
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disk_bytenr += bvec->bv_len;
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offset += bvec->bv_len;
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bvec++;
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}
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this_sum_bytes = 0;
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btrfs_add_ordered_sum(inode, ordered, sums);
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btrfs_put_ordered_extent(ordered);
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return 0;
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}
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int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_ordered_sum *sums)
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{
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u64 bytenr;
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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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u64 next_offset;
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u64 total_bytes = 0;
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int found_next;
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struct btrfs_path *path;
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struct btrfs_csum_item *item;
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struct btrfs_csum_item *item_end;
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struct extent_buffer *leaf = NULL;
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u64 csum_offset;
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struct btrfs_sector_sum *sector_sum;
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u32 nritems;
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u32 ins_size;
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char *eb_map;
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char *eb_token;
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unsigned long map_len;
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unsigned long map_start;
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u16 csum_size =
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btrfs_super_csum_size(&root->fs_info->super_copy);
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path = btrfs_alloc_path();
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BUG_ON(!path);
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sector_sum = sums->sums;
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again:
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next_offset = (u64)-1;
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found_next = 0;
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file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
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file_key.offset = sector_sum->bytenr;
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bytenr = sector_sum->bytenr;
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btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
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item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1);
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if (!IS_ERR(item)) {
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leaf = path->nodes[0];
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ret = 0;
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goto found;
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}
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ret = PTR_ERR(item);
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if (ret == -EFBIG) {
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u32 item_size;
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/* we found one, but it isn't big enough yet */
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leaf = path->nodes[0];
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item_size = btrfs_item_size_nr(leaf, path->slots[0]);
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if ((item_size / csum_size) >=
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MAX_CSUM_ITEMS(root, csum_size)) {
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/* already at max size, make a new one */
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goto insert;
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}
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} else {
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int slot = path->slots[0] + 1;
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/* we didn't find a csum item, insert one */
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nritems = btrfs_header_nritems(path->nodes[0]);
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if (path->slots[0] >= nritems - 1) {
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ret = btrfs_next_leaf(root, path);
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if (ret == 1)
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found_next = 1;
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if (ret != 0)
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goto insert;
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slot = 0;
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}
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btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
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if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
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found_key.type != BTRFS_EXTENT_CSUM_KEY) {
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found_next = 1;
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goto insert;
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}
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next_offset = found_key.offset;
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found_next = 1;
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goto insert;
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}
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/*
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* at this point, we know the tree has an item, but it isn't big
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* enough yet to put our csum in. Grow it
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*/
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btrfs_release_path(root, path);
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ret = btrfs_search_slot(trans, root, &file_key, path,
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csum_size, 1);
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if (ret < 0)
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goto fail_unlock;
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if (ret == 0) {
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BUG();
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}
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if (path->slots[0] == 0) {
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goto insert;
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}
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path->slots[0]--;
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leaf = path->nodes[0];
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btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
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csum_offset = (bytenr - found_key.offset) >>
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root->fs_info->sb->s_blocksize_bits;
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if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY ||
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found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
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csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
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goto insert;
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}
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if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) /
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csum_size) {
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u32 diff = (csum_offset + 1) * csum_size;
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diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
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if (diff != csum_size)
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goto insert;
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ret = btrfs_extend_item(trans, root, path, diff);
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BUG_ON(ret);
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goto csum;
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}
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insert:
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btrfs_release_path(root, path);
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csum_offset = 0;
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if (found_next) {
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u64 tmp = total_bytes + root->sectorsize;
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u64 next_sector = sector_sum->bytenr;
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struct btrfs_sector_sum *next = sector_sum + 1;
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while(tmp < sums->len) {
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if (next_sector + root->sectorsize != next->bytenr)
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break;
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tmp += root->sectorsize;
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next_sector = next->bytenr;
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next++;
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}
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tmp = min(tmp, next_offset - file_key.offset);
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tmp >>= root->fs_info->sb->s_blocksize_bits;
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tmp = max((u64)1, tmp);
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tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
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ins_size = csum_size * tmp;
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} else {
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ins_size = csum_size;
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}
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ret = btrfs_insert_empty_item(trans, root, path, &file_key,
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ins_size);
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if (ret < 0)
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goto fail_unlock;
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if (ret != 0) {
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WARN_ON(1);
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goto fail_unlock;
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}
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csum:
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leaf = path->nodes[0];
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item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
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ret = 0;
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item = (struct btrfs_csum_item *)((unsigned char *)item +
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csum_offset * csum_size);
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found:
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item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
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item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
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btrfs_item_size_nr(leaf, path->slots[0]));
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|
eb_token = NULL;
|
|
cond_resched();
|
|
next_sector:
|
|
|
|
if (!eb_token ||
|
|
(unsigned long)item + csum_size >= map_start + map_len) {
|
|
int err;
|
|
|
|
if (eb_token)
|
|
unmap_extent_buffer(leaf, eb_token, KM_USER1);
|
|
eb_token = NULL;
|
|
err = map_private_extent_buffer(leaf, (unsigned long)item,
|
|
csum_size,
|
|
&eb_token, &eb_map,
|
|
&map_start, &map_len, KM_USER1);
|
|
if (err)
|
|
eb_token = NULL;
|
|
}
|
|
if (eb_token) {
|
|
memcpy(eb_token + ((unsigned long)item & (PAGE_CACHE_SIZE - 1)),
|
|
§or_sum->sum, csum_size);
|
|
} else {
|
|
write_extent_buffer(leaf, §or_sum->sum,
|
|
(unsigned long)item, csum_size);
|
|
}
|
|
|
|
total_bytes += root->sectorsize;
|
|
sector_sum++;
|
|
if (total_bytes < sums->len) {
|
|
item = (struct btrfs_csum_item *)((char *)item +
|
|
csum_size);
|
|
if (item < item_end && bytenr + PAGE_CACHE_SIZE ==
|
|
sector_sum->bytenr) {
|
|
bytenr = sector_sum->bytenr;
|
|
goto next_sector;
|
|
}
|
|
}
|
|
if (eb_token) {
|
|
unmap_extent_buffer(leaf, eb_token, KM_USER1);
|
|
eb_token = NULL;
|
|
}
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
cond_resched();
|
|
if (total_bytes < sums->len) {
|
|
btrfs_release_path(root, path);
|
|
goto again;
|
|
}
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
|
|
fail_unlock:
|
|
goto out;
|
|
}
|
|
|
|
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct btrfs_path *path,
|
|
u64 isize)
|
|
{
|
|
struct btrfs_key key;
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
int slot = path->slots[0];
|
|
int ret;
|
|
u32 new_item_size;
|
|
u64 new_item_span;
|
|
u64 blocks;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
if (isize <= key.offset)
|
|
return 0;
|
|
new_item_span = isize - key.offset;
|
|
blocks = (new_item_span + root->sectorsize - 1) >>
|
|
root->fs_info->sb->s_blocksize_bits;
|
|
new_item_size = blocks *
|
|
btrfs_super_csum_size(&root->fs_info->super_copy);
|
|
if (new_item_size >= btrfs_item_size_nr(leaf, slot))
|
|
return 0;
|
|
ret = btrfs_truncate_item(trans, root, path, new_item_size, 1);
|
|
BUG_ON(ret);
|
|
return ret;
|
|
}
|