db94535db7
Signed-off-by: Chris Mason <chris.mason@oracle.com>
681 lines
18 KiB
C
681 lines
18 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/fs.h>
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#include <linux/blkdev.h>
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#include <linux/crc32c.h>
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#include <linux/scatterlist.h>
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#include <linux/swap.h>
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#include <linux/radix-tree.h>
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#include <linux/writeback.h>
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#include <linux/buffer_head.h> // for block_sync_page
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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 "btrfs_inode.h"
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#include "print-tree.h"
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#if 0
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static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
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{
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if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) {
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printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n",
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(unsigned long long)extent_buffer_blocknr(buf),
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(unsigned long long)btrfs_header_blocknr(buf));
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return 1;
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}
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return 0;
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}
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#endif
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struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
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u64 bytenr, u32 blocksize)
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{
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struct inode *btree_inode = root->fs_info->btree_inode;
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struct extent_buffer *eb;
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eb = find_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
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bytenr, blocksize, GFP_NOFS);
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if (eb)
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eb->alloc_addr = (unsigned long)__builtin_return_address(0);
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return eb;
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}
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struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
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u64 bytenr, u32 blocksize)
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{
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struct inode *btree_inode = root->fs_info->btree_inode;
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struct extent_buffer *eb;
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eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
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bytenr, blocksize, GFP_NOFS);
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eb->alloc_addr = (unsigned long)__builtin_return_address(0);
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return eb;
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}
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struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
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size_t page_offset, u64 start, u64 end,
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int create)
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{
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struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
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struct extent_map *em;
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int ret;
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again:
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em = lookup_extent_mapping(em_tree, start, end);
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if (em) {
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goto out;
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}
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em = alloc_extent_map(GFP_NOFS);
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if (!em) {
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em = ERR_PTR(-ENOMEM);
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goto out;
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}
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em->start = 0;
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em->end = (i_size_read(inode) & ~((u64)PAGE_CACHE_SIZE -1)) - 1;
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em->block_start = 0;
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em->block_end = em->end;
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em->bdev = inode->i_sb->s_bdev;
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ret = add_extent_mapping(em_tree, em);
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if (ret == -EEXIST) {
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free_extent_map(em);
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em = NULL;
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goto again;
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} else if (ret) {
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em = ERR_PTR(ret);
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}
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out:
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return em;
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}
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static int btree_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct extent_map_tree *tree;
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tree = &BTRFS_I(page->mapping->host)->extent_tree;
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return extent_write_full_page(tree, page, btree_get_extent, wbc);
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}
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int btree_readpage(struct file *file, struct page *page)
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{
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struct extent_map_tree *tree;
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tree = &BTRFS_I(page->mapping->host)->extent_tree;
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return extent_read_full_page(tree, page, btree_get_extent);
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}
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static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
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{
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struct extent_map_tree *tree;
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int ret;
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BUG_ON(page->private != 1);
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tree = &BTRFS_I(page->mapping->host)->extent_tree;
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ret = try_release_extent_mapping(tree, page);
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if (ret == 1) {
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ClearPagePrivate(page);
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set_page_private(page, 0);
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page_cache_release(page);
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}
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return ret;
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}
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static void btree_invalidatepage(struct page *page, unsigned long offset)
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{
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struct extent_map_tree *tree;
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tree = &BTRFS_I(page->mapping->host)->extent_tree;
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extent_invalidatepage(tree, page, offset);
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btree_releasepage(page, GFP_NOFS);
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}
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int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
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char *result)
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{
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return 0;
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#if 0
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u32 crc;
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crc = crc32c(0, data, len);
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memcpy(result, &crc, BTRFS_CRC32_SIZE);
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return 0;
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#endif
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}
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#if 0
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static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
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int verify)
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{
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return 0;
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char result[BTRFS_CRC32_SIZE];
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int ret;
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struct btrfs_node *node;
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ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE,
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bh->b_size - BTRFS_CSUM_SIZE, result);
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if (ret)
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return ret;
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if (verify) {
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if (memcmp(bh->b_data, result, BTRFS_CRC32_SIZE)) {
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printk("btrfs: %s checksum verify failed on %llu\n",
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root->fs_info->sb->s_id,
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(unsigned long long)bh_blocknr(bh));
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return 1;
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}
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} else {
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node = btrfs_buffer_node(bh);
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memcpy(node->header.csum, result, BTRFS_CRC32_SIZE);
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}
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return 0;
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}
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#endif
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#if 0
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static int btree_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct buffer_head *bh;
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struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
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struct buffer_head *head;
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if (!page_has_buffers(page)) {
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create_empty_buffers(page, root->fs_info->sb->s_blocksize,
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(1 << BH_Dirty)|(1 << BH_Uptodate));
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}
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head = page_buffers(page);
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bh = head;
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do {
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if (buffer_dirty(bh))
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csum_tree_block(root, bh, 0);
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bh = bh->b_this_page;
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} while (bh != head);
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return block_write_full_page(page, btree_get_block, wbc);
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}
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#endif
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static struct address_space_operations btree_aops = {
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.readpage = btree_readpage,
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.writepage = btree_writepage,
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.releasepage = btree_releasepage,
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.invalidatepage = btree_invalidatepage,
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.sync_page = block_sync_page,
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};
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int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
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{
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struct extent_buffer *buf = NULL;
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struct inode *btree_inode = root->fs_info->btree_inode;
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int ret = 0;
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buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
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if (!buf)
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return 0;
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read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
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buf, 0);
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free_extent_buffer(buf);
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return ret;
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}
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struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
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u32 blocksize)
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{
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struct extent_buffer *buf = NULL;
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struct inode *btree_inode = root->fs_info->btree_inode;
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buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
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if (!buf)
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return NULL;
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read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
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buf, 1);
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buf->alloc_addr = (unsigned long)__builtin_return_address(0);
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return buf;
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}
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int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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struct extent_buffer *buf)
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{
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struct inode *btree_inode = root->fs_info->btree_inode;
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clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
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return 0;
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}
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int wait_on_tree_block_writeback(struct btrfs_root *root,
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struct extent_buffer *buf)
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{
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struct inode *btree_inode = root->fs_info->btree_inode;
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wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree,
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buf);
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return 0;
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}
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int set_tree_block_dirty(struct btrfs_root *root, struct extent_buffer *buf)
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{
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struct inode *btree_inode = root->fs_info->btree_inode;
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set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
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return 0;
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}
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static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
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struct btrfs_root *root,
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struct btrfs_fs_info *fs_info,
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u64 objectid)
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{
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root->node = NULL;
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root->inode = NULL;
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root->commit_root = NULL;
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root->sectorsize = sectorsize;
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root->nodesize = nodesize;
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root->leafsize = leafsize;
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root->ref_cows = 0;
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root->fs_info = fs_info;
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root->objectid = objectid;
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root->last_trans = 0;
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root->highest_inode = 0;
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root->last_inode_alloc = 0;
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root->name = NULL;
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memset(&root->root_key, 0, sizeof(root->root_key));
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memset(&root->root_item, 0, sizeof(root->root_item));
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memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
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memset(&root->root_kobj, 0, sizeof(root->root_kobj));
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init_completion(&root->kobj_unregister);
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init_rwsem(&root->snap_sem);
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root->defrag_running = 0;
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root->defrag_level = 0;
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root->root_key.objectid = objectid;
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return 0;
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}
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static int find_and_setup_root(struct btrfs_root *tree_root,
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struct btrfs_fs_info *fs_info,
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u64 objectid,
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struct btrfs_root *root)
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{
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int ret;
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u32 blocksize;
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__setup_root(tree_root->nodesize, tree_root->leafsize,
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tree_root->sectorsize, root, fs_info, objectid);
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ret = btrfs_find_last_root(tree_root, objectid,
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&root->root_item, &root->root_key);
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BUG_ON(ret);
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blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
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root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
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blocksize);
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BUG_ON(!root->node);
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return 0;
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}
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struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
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struct btrfs_key *location)
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{
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struct btrfs_root *root;
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struct btrfs_root *tree_root = fs_info->tree_root;
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struct btrfs_path *path;
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struct extent_buffer *l;
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u64 highest_inode;
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u32 blocksize;
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int ret = 0;
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root = kzalloc(sizeof(*root), GFP_NOFS);
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if (!root)
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return ERR_PTR(-ENOMEM);
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if (location->offset == (u64)-1) {
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ret = find_and_setup_root(tree_root, fs_info,
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location->objectid, root);
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if (ret) {
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kfree(root);
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return ERR_PTR(ret);
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}
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goto insert;
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}
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__setup_root(tree_root->nodesize, tree_root->leafsize,
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tree_root->sectorsize, root, fs_info,
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location->objectid);
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path = btrfs_alloc_path();
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BUG_ON(!path);
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ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
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if (ret != 0) {
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if (ret > 0)
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ret = -ENOENT;
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goto out;
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}
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l = path->nodes[0];
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read_extent_buffer(l, &root->root_item,
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btrfs_item_ptr_offset(l, path->slots[0]),
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sizeof(root->root_item));
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ret = 0;
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out:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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if (ret) {
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kfree(root);
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return ERR_PTR(ret);
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}
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blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
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root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
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blocksize);
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BUG_ON(!root->node);
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insert:
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root->ref_cows = 1;
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ret = btrfs_find_highest_inode(root, &highest_inode);
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if (ret == 0) {
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root->highest_inode = highest_inode;
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root->last_inode_alloc = highest_inode;
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}
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return root;
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}
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struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
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struct btrfs_key *location,
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const char *name, int namelen)
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{
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struct btrfs_root *root;
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int ret;
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root = radix_tree_lookup(&fs_info->fs_roots_radix,
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(unsigned long)location->objectid);
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if (root)
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return root;
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root = btrfs_read_fs_root_no_radix(fs_info, location);
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if (IS_ERR(root))
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return root;
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ret = radix_tree_insert(&fs_info->fs_roots_radix,
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(unsigned long)root->root_key.objectid,
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root);
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if (ret) {
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free_extent_buffer(root->node);
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kfree(root);
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return ERR_PTR(ret);
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}
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ret = btrfs_set_root_name(root, name, namelen);
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if (ret) {
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free_extent_buffer(root->node);
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kfree(root);
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return ERR_PTR(ret);
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}
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ret = btrfs_sysfs_add_root(root);
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if (ret) {
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free_extent_buffer(root->node);
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kfree(root->name);
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kfree(root);
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return ERR_PTR(ret);
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}
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ret = btrfs_find_dead_roots(fs_info->tree_root,
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root->root_key.objectid, root);
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BUG_ON(ret);
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return root;
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}
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struct btrfs_root *open_ctree(struct super_block *sb)
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{
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u32 sectorsize;
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u32 nodesize;
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u32 leafsize;
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u32 blocksize;
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struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
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GFP_NOFS);
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int ret;
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int err = -EIO;
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struct btrfs_super_block *disk_super;
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if (!extent_root || !tree_root || !fs_info) {
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err = -ENOMEM;
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goto fail;
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}
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INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
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INIT_LIST_HEAD(&fs_info->trans_list);
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INIT_LIST_HEAD(&fs_info->dead_roots);
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memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
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init_completion(&fs_info->kobj_unregister);
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sb_set_blocksize(sb, 4096);
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fs_info->running_transaction = NULL;
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fs_info->last_trans_committed = 0;
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fs_info->tree_root = tree_root;
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fs_info->extent_root = extent_root;
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fs_info->sb = sb;
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fs_info->btree_inode = new_inode(sb);
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fs_info->btree_inode->i_ino = 1;
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fs_info->btree_inode->i_nlink = 1;
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fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
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fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
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extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
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fs_info->btree_inode->i_mapping,
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GFP_NOFS);
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extent_map_tree_init(&fs_info->free_space_cache,
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fs_info->btree_inode->i_mapping, GFP_NOFS);
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extent_map_tree_init(&fs_info->block_group_cache,
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fs_info->btree_inode->i_mapping, GFP_NOFS);
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extent_map_tree_init(&fs_info->pinned_extents,
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fs_info->btree_inode->i_mapping, GFP_NOFS);
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extent_map_tree_init(&fs_info->pending_del,
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fs_info->btree_inode->i_mapping, GFP_NOFS);
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extent_map_tree_init(&fs_info->extent_ins,
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fs_info->btree_inode->i_mapping, GFP_NOFS);
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fs_info->do_barriers = 1;
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fs_info->closing = 0;
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|
|
INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
|
|
BTRFS_I(fs_info->btree_inode)->root = tree_root;
|
|
memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
|
|
sizeof(struct btrfs_key));
|
|
insert_inode_hash(fs_info->btree_inode);
|
|
mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
|
|
|
|
mutex_init(&fs_info->trans_mutex);
|
|
mutex_init(&fs_info->fs_mutex);
|
|
|
|
__setup_root(512, 512, 512, tree_root,
|
|
fs_info, BTRFS_ROOT_TREE_OBJECTID);
|
|
|
|
fs_info->sb_buffer = read_tree_block(tree_root,
|
|
BTRFS_SUPER_INFO_OFFSET,
|
|
512);
|
|
|
|
if (!fs_info->sb_buffer)
|
|
goto fail_iput;
|
|
|
|
read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
|
|
sizeof(fs_info->super_copy));
|
|
|
|
read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
|
|
(unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
|
|
BTRFS_FSID_SIZE);
|
|
disk_super = &fs_info->super_copy;
|
|
if (!btrfs_super_root(disk_super))
|
|
goto fail_sb_buffer;
|
|
|
|
nodesize = btrfs_super_nodesize(disk_super);
|
|
leafsize = btrfs_super_leafsize(disk_super);
|
|
sectorsize = btrfs_super_sectorsize(disk_super);
|
|
tree_root->nodesize = nodesize;
|
|
tree_root->leafsize = leafsize;
|
|
tree_root->sectorsize = sectorsize;
|
|
|
|
i_size_write(fs_info->btree_inode,
|
|
btrfs_super_total_bytes(disk_super));
|
|
|
|
|
|
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
|
|
sizeof(disk_super->magic))) {
|
|
printk("btrfs: valid FS not found on %s\n", sb->s_id);
|
|
goto fail_sb_buffer;
|
|
}
|
|
blocksize = btrfs_level_size(tree_root,
|
|
btrfs_super_root_level(disk_super));
|
|
tree_root->node = read_tree_block(tree_root,
|
|
btrfs_super_root(disk_super),
|
|
blocksize);
|
|
if (!tree_root->node)
|
|
goto fail_sb_buffer;
|
|
|
|
#if 0
|
|
btrfs_print_leaf(tree_root, tree_root->node);
|
|
err = -EIO;
|
|
goto fail_tree_root;
|
|
#endif
|
|
mutex_lock(&fs_info->fs_mutex);
|
|
|
|
ret = find_and_setup_root(tree_root, fs_info,
|
|
BTRFS_EXTENT_TREE_OBJECTID, extent_root);
|
|
if (ret) {
|
|
mutex_unlock(&fs_info->fs_mutex);
|
|
goto fail_tree_root;
|
|
}
|
|
|
|
btrfs_read_block_groups(extent_root);
|
|
|
|
fs_info->generation = btrfs_super_generation(disk_super) + 1;
|
|
mutex_unlock(&fs_info->fs_mutex);
|
|
return tree_root;
|
|
|
|
fail_tree_root:
|
|
free_extent_buffer(tree_root->node);
|
|
fail_sb_buffer:
|
|
free_extent_buffer(fs_info->sb_buffer);
|
|
fail_iput:
|
|
iput(fs_info->btree_inode);
|
|
fail:
|
|
kfree(extent_root);
|
|
kfree(tree_root);
|
|
kfree(fs_info);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root)
|
|
{
|
|
int ret;
|
|
struct extent_buffer *super = root->fs_info->sb_buffer;
|
|
struct inode *btree_inode = root->fs_info->btree_inode;
|
|
|
|
set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
|
|
ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
|
|
super->start, super->len);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
|
|
{
|
|
radix_tree_delete(&fs_info->fs_roots_radix,
|
|
(unsigned long)root->root_key.objectid);
|
|
btrfs_sysfs_del_root(root);
|
|
if (root->inode)
|
|
iput(root->inode);
|
|
if (root->node)
|
|
free_extent_buffer(root->node);
|
|
if (root->commit_root)
|
|
free_extent_buffer(root->commit_root);
|
|
if (root->name)
|
|
kfree(root->name);
|
|
kfree(root);
|
|
return 0;
|
|
}
|
|
|
|
static int del_fs_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *gang[8];
|
|
int i;
|
|
|
|
while(1) {
|
|
ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
|
|
(void **)gang, 0,
|
|
ARRAY_SIZE(gang));
|
|
if (!ret)
|
|
break;
|
|
for (i = 0; i < ret; i++)
|
|
btrfs_free_fs_root(fs_info, gang[i]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int close_ctree(struct btrfs_root *root)
|
|
{
|
|
int ret;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
fs_info->closing = 1;
|
|
btrfs_transaction_flush_work(root);
|
|
mutex_lock(&fs_info->fs_mutex);
|
|
btrfs_defrag_dirty_roots(root->fs_info);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
/* run commit again to drop the original snapshot */
|
|
trans = btrfs_start_transaction(root, 1);
|
|
btrfs_commit_transaction(trans, root);
|
|
ret = btrfs_write_and_wait_transaction(NULL, root);
|
|
BUG_ON(ret);
|
|
write_ctree_super(NULL, root);
|
|
mutex_unlock(&fs_info->fs_mutex);
|
|
|
|
if (fs_info->extent_root->node)
|
|
free_extent_buffer(fs_info->extent_root->node);
|
|
|
|
if (fs_info->tree_root->node)
|
|
free_extent_buffer(fs_info->tree_root->node);
|
|
|
|
free_extent_buffer(fs_info->sb_buffer);
|
|
|
|
btrfs_free_block_groups(root->fs_info);
|
|
del_fs_roots(fs_info);
|
|
truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
|
|
iput(fs_info->btree_inode);
|
|
kfree(fs_info->extent_root);
|
|
kfree(fs_info->tree_root);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_buffer_uptodate(struct extent_buffer *buf)
|
|
{
|
|
struct inode *btree_inode = buf->first_page->mapping->host;
|
|
return extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, buf);
|
|
}
|
|
|
|
int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
|
|
{
|
|
struct inode *btree_inode = buf->first_page->mapping->host;
|
|
return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree,
|
|
buf);
|
|
}
|
|
|
|
void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
|
|
u64 transid = btrfs_header_generation(buf);
|
|
struct inode *btree_inode = root->fs_info->btree_inode;
|
|
|
|
if (transid != root->fs_info->generation) {
|
|
printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
|
|
(unsigned long long)buf->start,
|
|
transid, root->fs_info->generation);
|
|
WARN_ON(1);
|
|
}
|
|
set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
|
|
}
|
|
|
|
void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
|
|
{
|
|
balance_dirty_pages_ratelimited_nr(
|
|
root->fs_info->btree_inode->i_mapping, nr);
|
|
}
|