2007-02-02 14:18:22 +00:00
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#define _XOPEN_SOURCE 500
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "kerncompat.h"
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#include "radix-tree.h"
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#include "ctree.h"
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#include "disk-io.h"
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2007-03-16 20:20:31 +00:00
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#include "transaction.h"
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2007-02-02 14:18:22 +00:00
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static int allocated_blocks = 0;
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2007-03-01 23:59:40 +00:00
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int cache_max = 10000;
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2007-02-02 14:18:22 +00:00
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2007-03-13 14:46:10 +00:00
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static int check_tree_block(struct btrfs_root *root, struct btrfs_buffer *buf)
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2007-02-02 14:18:22 +00:00
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{
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2007-03-12 16:01:18 +00:00
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if (buf->blocknr != btrfs_header_blocknr(&buf->node.header))
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2007-02-23 13:38:36 +00:00
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BUG();
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2007-03-12 16:01:18 +00:00
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if (root->node && btrfs_header_parentid(&buf->node.header) !=
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btrfs_header_parentid(&root->node->node.header))
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2007-02-23 13:38:36 +00:00
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BUG();
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return 0;
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2007-02-02 14:18:22 +00:00
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}
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2007-03-13 14:46:10 +00:00
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static int free_some_buffers(struct btrfs_root *root)
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2007-03-01 23:59:40 +00:00
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{
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struct list_head *node, *next;
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2007-03-13 14:46:10 +00:00
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struct btrfs_buffer *b;
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2007-03-20 18:38:32 +00:00
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if (root->fs_info->cache_size < cache_max)
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2007-03-01 23:59:40 +00:00
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return 0;
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2007-03-20 18:38:32 +00:00
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list_for_each_safe(node, next, &root->fs_info->cache) {
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2007-03-13 14:46:10 +00:00
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b = list_entry(node, struct btrfs_buffer, cache);
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2007-03-01 23:59:40 +00:00
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if (b->count == 1) {
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BUG_ON(!list_empty(&b->dirty));
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list_del_init(&b->cache);
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2007-03-13 14:46:10 +00:00
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btrfs_block_release(root, b);
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2007-03-20 18:38:32 +00:00
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if (root->fs_info->cache_size < cache_max)
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2007-03-02 15:06:43 +00:00
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break;
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2007-03-01 23:59:40 +00:00
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}
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}
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return 0;
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}
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2007-03-13 14:46:10 +00:00
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struct btrfs_buffer *alloc_tree_block(struct btrfs_root *root, u64 blocknr)
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2007-02-02 14:18:22 +00:00
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{
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2007-03-13 14:46:10 +00:00
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struct btrfs_buffer *buf;
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2007-02-02 14:18:22 +00:00
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int ret;
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2007-03-14 18:14:43 +00:00
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buf = malloc(sizeof(struct btrfs_buffer) + root->blocksize);
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2007-02-02 14:18:22 +00:00
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if (!buf)
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return buf;
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allocated_blocks++;
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buf->blocknr = blocknr;
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2007-03-01 23:59:40 +00:00
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buf->count = 2;
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INIT_LIST_HEAD(&buf->dirty);
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free_some_buffers(root);
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2007-02-02 14:18:22 +00:00
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radix_tree_preload(GFP_KERNEL);
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2007-03-20 18:38:32 +00:00
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ret = radix_tree_insert(&root->fs_info->cache_radix, blocknr, buf);
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2007-02-02 14:18:22 +00:00
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radix_tree_preload_end();
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2007-03-20 18:38:32 +00:00
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list_add_tail(&buf->cache, &root->fs_info->cache);
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root->fs_info->cache_size++;
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2007-02-02 14:18:22 +00:00
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if (ret) {
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free(buf);
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return NULL;
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}
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return buf;
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}
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2007-03-13 14:46:10 +00:00
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struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 blocknr)
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2007-02-02 14:18:22 +00:00
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{
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2007-03-13 14:46:10 +00:00
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struct btrfs_buffer *buf;
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2007-03-20 18:38:32 +00:00
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buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr);
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2007-02-23 13:38:36 +00:00
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if (buf) {
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buf->count++;
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} else {
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buf = alloc_tree_block(root, blocknr);
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if (!buf) {
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BUG();
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return NULL;
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}
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2007-02-02 14:18:22 +00:00
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}
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return buf;
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}
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2007-03-13 14:46:10 +00:00
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struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr)
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2007-02-02 14:18:22 +00:00
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{
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2007-03-14 18:14:43 +00:00
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loff_t offset = blocknr * root->blocksize;
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2007-03-13 14:46:10 +00:00
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struct btrfs_buffer *buf;
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2007-02-02 14:18:22 +00:00
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int ret;
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2007-03-20 18:38:32 +00:00
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buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr);
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2007-02-02 14:18:22 +00:00
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if (buf) {
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buf->count++;
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2007-02-23 13:38:36 +00:00
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} else {
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buf = alloc_tree_block(root, blocknr);
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if (!buf)
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return NULL;
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2007-03-20 18:38:32 +00:00
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ret = pread(root->fs_info->fp, &buf->node, root->blocksize,
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offset);
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2007-03-14 18:14:43 +00:00
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if (ret != root->blocksize) {
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2007-02-23 13:38:36 +00:00
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free(buf);
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return NULL;
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}
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2007-02-02 14:18:22 +00:00
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}
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2007-02-23 13:38:36 +00:00
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if (check_tree_block(root, buf))
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2007-02-21 22:04:57 +00:00
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BUG();
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2007-02-02 14:18:22 +00:00
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return buf;
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}
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2007-03-16 20:20:31 +00:00
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int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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struct btrfs_buffer *buf)
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2007-03-01 23:59:40 +00:00
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{
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if (!list_empty(&buf->dirty))
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return 0;
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2007-03-20 18:38:32 +00:00
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list_add_tail(&buf->dirty, &root->fs_info->trans);
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2007-03-01 23:59:40 +00:00
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buf->count++;
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return 0;
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}
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2007-03-16 20:20:31 +00:00
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int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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struct btrfs_buffer *buf)
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2007-03-01 23:59:40 +00:00
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{
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if (!list_empty(&buf->dirty)) {
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list_del_init(&buf->dirty);
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2007-03-13 14:46:10 +00:00
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btrfs_block_release(root, buf);
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2007-03-01 23:59:40 +00:00
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}
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return 0;
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}
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2007-03-16 20:20:31 +00:00
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int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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struct btrfs_buffer *buf)
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2007-02-02 14:18:22 +00:00
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{
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u64 blocknr = buf->blocknr;
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2007-03-14 18:14:43 +00:00
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loff_t offset = blocknr * root->blocksize;
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2007-02-02 14:18:22 +00:00
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int ret;
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2007-03-12 16:01:18 +00:00
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if (buf->blocknr != btrfs_header_blocknr(&buf->node.header))
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2007-02-02 14:18:22 +00:00
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BUG();
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2007-03-20 18:38:32 +00:00
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ret = pwrite(root->fs_info->fp, &buf->node, root->blocksize, offset);
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2007-03-14 18:14:43 +00:00
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if (ret != root->blocksize)
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2007-02-02 14:18:22 +00:00
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return ret;
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return 0;
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}
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2007-03-16 20:20:31 +00:00
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static int __commit_transaction(struct btrfs_trans_handle *trans, struct
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btrfs_root *root)
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2007-03-01 23:59:40 +00:00
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{
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2007-03-13 14:46:10 +00:00
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struct btrfs_buffer *b;
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2007-03-01 23:59:40 +00:00
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int ret = 0;
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int wret;
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2007-03-20 18:38:32 +00:00
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while(!list_empty(&root->fs_info->trans)) {
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b = list_entry(root->fs_info->trans.next, struct btrfs_buffer,
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dirty);
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2007-03-01 23:59:40 +00:00
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list_del_init(&b->dirty);
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2007-03-16 20:20:31 +00:00
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wret = write_tree_block(trans, root, b);
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2007-03-01 23:59:40 +00:00
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if (wret)
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ret = wret;
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2007-03-13 14:46:10 +00:00
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btrfs_block_release(root, b);
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2007-03-01 23:59:40 +00:00
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}
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return ret;
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}
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2007-03-20 18:38:32 +00:00
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static int commit_tree_roots(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info)
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2007-03-13 20:47:54 +00:00
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{
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int ret;
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u64 old_extent_block;
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2007-03-20 18:38:32 +00:00
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struct btrfs_root *tree_root = fs_info->tree_root;
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struct btrfs_root *extent_root = fs_info->extent_root;
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struct btrfs_root *inode_root = fs_info->inode_root;
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btrfs_set_root_blocknr(&inode_root->root_item,
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inode_root->node->blocknr);
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ret = btrfs_update_root(trans, tree_root,
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&inode_root->root_key,
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&inode_root->root_item);
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BUG_ON(ret);
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2007-03-13 20:47:54 +00:00
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while(1) {
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old_extent_block = btrfs_root_blocknr(&extent_root->root_item);
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if (old_extent_block == extent_root->node->blocknr)
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break;
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btrfs_set_root_blocknr(&extent_root->root_item,
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extent_root->node->blocknr);
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2007-03-16 20:20:31 +00:00
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ret = btrfs_update_root(trans, tree_root,
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2007-03-13 20:47:54 +00:00
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&extent_root->root_key,
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&extent_root->root_item);
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BUG_ON(ret);
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}
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return 0;
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}
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2007-03-16 20:20:31 +00:00
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int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct
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btrfs_root *root, struct btrfs_super_block *s)
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2007-03-01 23:59:40 +00:00
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{
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2007-03-07 01:08:01 +00:00
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int ret = 0;
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2007-03-13 20:47:54 +00:00
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struct btrfs_buffer *snap = root->commit_root;
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struct btrfs_key snap_key;
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2007-03-07 01:08:01 +00:00
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2007-03-13 20:47:54 +00:00
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if (root->commit_root == root->node)
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return 0;
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memcpy(&snap_key, &root->root_key, sizeof(snap_key));
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root->root_key.offset++;
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btrfs_set_root_blocknr(&root->root_item, root->node->blocknr);
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2007-03-20 18:38:32 +00:00
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ret = btrfs_insert_root(trans, root->fs_info->tree_root,
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&root->root_key, &root->root_item);
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BUG_ON(ret);
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ret = commit_tree_roots(trans, root->fs_info);
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2007-03-13 20:47:54 +00:00
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BUG_ON(ret);
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2007-03-20 18:38:32 +00:00
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ret = __commit_transaction(trans, root);
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2007-03-13 20:47:54 +00:00
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BUG_ON(ret);
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2007-03-16 20:20:31 +00:00
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write_ctree_super(trans, root, s);
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2007-03-20 18:38:32 +00:00
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btrfs_finish_extent_commit(trans, root->fs_info->extent_root);
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btrfs_finish_extent_commit(trans, root->fs_info->tree_root);
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2007-03-13 20:47:54 +00:00
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root->commit_root = root->node;
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root->node->count++;
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2007-03-16 20:20:31 +00:00
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ret = btrfs_drop_snapshot(trans, root, snap);
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2007-03-13 20:47:54 +00:00
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BUG_ON(ret);
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2007-03-20 18:38:32 +00:00
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ret = btrfs_del_root(trans, root->fs_info->tree_root, &snap_key);
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2007-03-13 20:47:54 +00:00
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BUG_ON(ret);
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2007-03-20 19:57:25 +00:00
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root->fs_info->generation = root->root_key.offset + 1;
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2007-03-13 20:47:54 +00:00
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2007-03-01 23:59:40 +00:00
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return ret;
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}
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2007-03-14 18:14:43 +00:00
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static int __setup_root(struct btrfs_super_block *super,
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2007-03-20 18:38:32 +00:00
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struct btrfs_root *root,
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struct btrfs_fs_info *fs_info,
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u64 objectid, int fp)
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2007-02-20 21:40:44 +00:00
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{
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2007-02-21 22:04:57 +00:00
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root->node = NULL;
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2007-03-07 01:08:01 +00:00
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root->commit_root = NULL;
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2007-03-14 18:14:43 +00:00
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root->blocksize = btrfs_super_blocksize(super);
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root->ref_cows = 0;
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2007-03-20 18:38:32 +00:00
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root->fs_info = fs_info;
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2007-03-13 20:47:54 +00:00
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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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return 0;
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}
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2007-03-14 18:14:43 +00:00
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static int find_and_setup_root(struct btrfs_super_block *super,
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2007-03-20 18:38:32 +00:00
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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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2007-03-14 18:14:43 +00:00
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struct btrfs_root *root, int fp)
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2007-03-13 20:47:54 +00:00
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{
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int ret;
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2007-03-20 18:38:32 +00:00
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__setup_root(super, root, fs_info, objectid, fp);
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2007-03-13 20:47:54 +00:00
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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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root->node = read_tree_block(root,
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btrfs_root_blocknr(&root->root_item));
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BUG_ON(!root->node);
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2007-02-20 21:40:44 +00:00
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return 0;
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}
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2007-03-13 14:46:10 +00:00
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struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *super)
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2007-03-21 15:12:56 +00:00
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{
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int fp;
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fp = open(filename, O_CREAT | O_RDWR, 0600);
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if (fp < 0) {
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return NULL;
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}
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return open_ctree_fd(fp, super);
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}
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struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
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2007-02-02 14:18:22 +00:00
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{
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2007-03-13 14:46:10 +00:00
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struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
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struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
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2007-03-13 20:47:54 +00:00
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struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
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2007-03-20 18:38:32 +00:00
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struct btrfs_root *inode_root = malloc(sizeof(struct btrfs_root));
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struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
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2007-02-02 14:18:22 +00:00
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int ret;
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2007-03-20 18:38:32 +00:00
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INIT_RADIX_TREE(&fs_info->cache_radix, GFP_KERNEL);
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INIT_RADIX_TREE(&fs_info->pinned_radix, GFP_KERNEL);
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INIT_LIST_HEAD(&fs_info->trans);
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INIT_LIST_HEAD(&fs_info->cache);
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fs_info->cache_size = 0;
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fs_info->fp = fp;
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fs_info->running_transaction = NULL;
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fs_info->fs_root = root;
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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->inode_root = inode_root;
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fs_info->last_inode_alloc = 0;
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fs_info->last_inode_alloc_dirid = 0;
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2007-03-21 00:35:03 +00:00
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fs_info->disk_super = super;
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2007-03-20 18:38:32 +00:00
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memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
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memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
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2007-03-13 20:47:54 +00:00
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2007-03-13 14:46:10 +00:00
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ret = pread(fp, super, sizeof(struct btrfs_super_block),
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2007-03-14 18:14:43 +00:00
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BTRFS_SUPER_INFO_OFFSET);
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2007-03-13 20:47:54 +00:00
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if (ret == 0 || btrfs_super_root(super) == 0) {
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2007-03-21 00:35:03 +00:00
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BUG();
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return NULL;
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2007-02-20 21:40:44 +00:00
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}
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BUG_ON(ret < 0);
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2007-03-13 20:47:54 +00:00
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2007-03-20 18:38:32 +00:00
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__setup_root(super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID, fp);
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2007-03-13 20:47:54 +00:00
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tree_root->node = read_tree_block(tree_root, btrfs_super_root(super));
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BUG_ON(!tree_root->node);
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2007-03-20 18:38:32 +00:00
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ret = find_and_setup_root(super, tree_root, fs_info,
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BTRFS_EXTENT_TREE_OBJECTID, extent_root, fp);
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2007-03-13 20:47:54 +00:00
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BUG_ON(ret);
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2007-03-20 18:38:32 +00:00
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ret = find_and_setup_root(super, tree_root, fs_info,
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BTRFS_INODE_MAP_OBJECTID, inode_root, fp);
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BUG_ON(ret);
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ret = find_and_setup_root(super, tree_root, fs_info,
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BTRFS_FS_TREE_OBJECTID, root, fp);
|
2007-03-13 20:47:54 +00:00
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BUG_ON(ret);
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|
|
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2007-03-07 01:08:01 +00:00
|
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root->commit_root = root->node;
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root->node->count++;
|
2007-03-13 20:47:54 +00:00
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root->ref_cows = 1;
|
2007-03-20 19:57:25 +00:00
|
|
|
root->fs_info->generation = root->root_key.offset + 1;
|
2007-02-02 14:18:22 +00:00
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|
return root;
|
|
|
|
}
|
|
|
|
|
2007-03-16 20:20:31 +00:00
|
|
|
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
|
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*root, struct btrfs_super_block *s)
|
2007-02-02 14:18:22 +00:00
|
|
|
{
|
|
|
|
int ret;
|
2007-03-20 18:38:32 +00:00
|
|
|
btrfs_set_super_root(s, root->fs_info->tree_root->node->blocknr);
|
|
|
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ret = pwrite(root->fs_info->fp, s, sizeof(*s),
|
2007-03-14 18:14:43 +00:00
|
|
|
BTRFS_SUPER_INFO_OFFSET);
|
2007-02-21 22:04:57 +00:00
|
|
|
if (ret != sizeof(*s)) {
|
|
|
|
fprintf(stderr, "failed to write new super block err %d\n", ret);
|
2007-02-02 14:18:22 +00:00
|
|
|
return ret;
|
2007-02-21 22:04:57 +00:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-03-13 14:46:10 +00:00
|
|
|
static int drop_cache(struct btrfs_root *root)
|
2007-03-01 23:59:40 +00:00
|
|
|
{
|
2007-03-20 18:38:32 +00:00
|
|
|
while(!list_empty(&root->fs_info->cache)) {
|
|
|
|
struct btrfs_buffer *b = list_entry(root->fs_info->cache.next,
|
|
|
|
struct btrfs_buffer,
|
|
|
|
cache);
|
2007-03-01 23:59:40 +00:00
|
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|
list_del_init(&b->cache);
|
2007-03-13 14:46:10 +00:00
|
|
|
btrfs_block_release(root, b);
|
2007-03-01 23:59:40 +00:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2007-03-13 14:46:10 +00:00
|
|
|
int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s)
|
2007-02-21 22:04:57 +00:00
|
|
|
{
|
2007-03-13 20:47:54 +00:00
|
|
|
int ret;
|
2007-03-16 20:20:31 +00:00
|
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
|
2007-03-20 18:38:32 +00:00
|
|
|
trans = root->fs_info->running_transaction;
|
2007-03-16 20:20:31 +00:00
|
|
|
btrfs_commit_transaction(trans, root, s);
|
2007-03-20 18:38:32 +00:00
|
|
|
ret = commit_tree_roots(trans, root->fs_info);
|
|
|
|
BUG_ON(ret);
|
|
|
|
ret = __commit_transaction(trans, root);
|
2007-03-13 20:47:54 +00:00
|
|
|
BUG_ON(ret);
|
2007-03-16 20:20:31 +00:00
|
|
|
write_ctree_super(trans, root, s);
|
2007-03-01 23:59:40 +00:00
|
|
|
drop_cache(root);
|
2007-03-20 18:38:32 +00:00
|
|
|
BUG_ON(!list_empty(&root->fs_info->trans));
|
2007-03-01 23:59:40 +00:00
|
|
|
|
2007-03-20 18:38:32 +00:00
|
|
|
close(root->fs_info->fp);
|
2007-02-21 22:04:57 +00:00
|
|
|
if (root->node)
|
2007-03-13 14:46:10 +00:00
|
|
|
btrfs_block_release(root, root->node);
|
2007-03-20 18:38:32 +00:00
|
|
|
if (root->fs_info->extent_root->node)
|
|
|
|
btrfs_block_release(root->fs_info->extent_root,
|
|
|
|
root->fs_info->extent_root->node);
|
|
|
|
if (root->fs_info->inode_root->node)
|
|
|
|
btrfs_block_release(root->fs_info->inode_root,
|
|
|
|
root->fs_info->inode_root->node);
|
|
|
|
if (root->fs_info->tree_root->node)
|
|
|
|
btrfs_block_release(root->fs_info->tree_root,
|
|
|
|
root->fs_info->tree_root->node);
|
2007-03-13 14:46:10 +00:00
|
|
|
btrfs_block_release(root, root->commit_root);
|
2007-02-21 22:04:57 +00:00
|
|
|
free(root);
|
|
|
|
printf("on close %d blocks are allocated\n", allocated_blocks);
|
2007-02-02 14:18:22 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-03-13 14:46:10 +00:00
|
|
|
void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf)
|
2007-02-02 14:18:22 +00:00
|
|
|
{
|
|
|
|
buf->count--;
|
2007-02-21 22:04:57 +00:00
|
|
|
if (buf->count < 0)
|
|
|
|
BUG();
|
2007-02-02 14:18:22 +00:00
|
|
|
if (buf->count == 0) {
|
2007-03-02 21:08:05 +00:00
|
|
|
BUG_ON(!list_empty(&buf->cache));
|
|
|
|
BUG_ON(!list_empty(&buf->dirty));
|
2007-03-20 18:38:32 +00:00
|
|
|
if (!radix_tree_lookup(&root->fs_info->cache_radix,
|
|
|
|
buf->blocknr))
|
2007-02-02 14:18:22 +00:00
|
|
|
BUG();
|
2007-03-20 18:38:32 +00:00
|
|
|
radix_tree_delete(&root->fs_info->cache_radix, buf->blocknr);
|
2007-02-02 14:18:22 +00:00
|
|
|
memset(buf, 0, sizeof(*buf));
|
|
|
|
free(buf);
|
|
|
|
BUG_ON(allocated_blocks == 0);
|
|
|
|
allocated_blocks--;
|
2007-03-20 18:38:32 +00:00
|
|
|
BUG_ON(root->fs_info->cache_size == 0);
|
|
|
|
root->fs_info->cache_size--;
|
2007-02-02 14:18:22 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|