mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-25 07:32:22 +00:00
74556aa757
Extent fixes
188 lines
4.4 KiB
C
188 lines
4.4 KiB
C
#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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static int allocated_blocks = 0;
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static int check_tree_block(struct ctree_root *root, struct tree_buffer *buf)
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{
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if (buf->blocknr != buf->node.header.blocknr)
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BUG();
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if (root->node && buf->node.header.parentid != root->node->node.header.parentid)
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BUG();
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return 0;
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}
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struct tree_buffer *alloc_tree_block(struct ctree_root *root, u64 blocknr)
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{
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struct tree_buffer *buf;
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int ret;
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buf = malloc(sizeof(struct tree_buffer));
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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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buf->count = 1;
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radix_tree_preload(GFP_KERNEL);
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ret = radix_tree_insert(&root->cache_radix, blocknr, buf);
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radix_tree_preload_end();
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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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struct tree_buffer *find_tree_block(struct ctree_root *root, u64 blocknr)
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{
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struct tree_buffer *buf;
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buf = radix_tree_lookup(&root->cache_radix, blocknr);
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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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}
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return buf;
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}
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struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr)
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{
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loff_t offset = blocknr * CTREE_BLOCKSIZE;
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struct tree_buffer *buf;
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int ret;
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buf = radix_tree_lookup(&root->cache_radix, blocknr);
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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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return NULL;
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ret = pread(root->fp, &buf->node, CTREE_BLOCKSIZE, offset);
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if (ret != CTREE_BLOCKSIZE) {
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free(buf);
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return NULL;
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}
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}
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if (check_tree_block(root, buf))
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BUG();
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return buf;
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}
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int write_tree_block(struct ctree_root *root, struct tree_buffer *buf)
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{
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u64 blocknr = buf->blocknr;
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loff_t offset = blocknr * CTREE_BLOCKSIZE;
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int ret;
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if (buf->blocknr != buf->node.header.blocknr)
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BUG();
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ret = pwrite(root->fp, &buf->node, CTREE_BLOCKSIZE, offset);
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if (ret != CTREE_BLOCKSIZE)
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return ret;
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return 0;
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}
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static int __setup_root(struct ctree_root *root, struct ctree_root *extent_root,
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struct ctree_root_info *info, int fp)
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{
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root->fp = fp;
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root->node = NULL;
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root->node = read_tree_block(root, info->tree_root);
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root->extent_root = extent_root;
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return 0;
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}
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struct ctree_root *open_ctree(char *filename, struct ctree_super_block *super)
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{
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struct ctree_root *root = malloc(sizeof(struct ctree_root));
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struct ctree_root *extent_root = malloc(sizeof(struct ctree_root));
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int fp;
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int ret;
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fp = open(filename, O_CREAT | O_RDWR);
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if (fp < 0) {
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free(root);
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return NULL;
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}
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INIT_RADIX_TREE(&root->cache_radix, GFP_KERNEL);
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INIT_RADIX_TREE(&extent_root->cache_radix, GFP_KERNEL);
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ret = pread(fp, super, sizeof(struct ctree_super_block),
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CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
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if (ret == 0 || super->root_info.tree_root == 0) {
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printf("making new FS!\n");
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ret = mkfs(fp);
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if (ret)
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return NULL;
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ret = pread(fp, super, sizeof(struct ctree_super_block),
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CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
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if (ret != sizeof(struct ctree_super_block))
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return NULL;
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}
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BUG_ON(ret < 0);
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__setup_root(root, extent_root, &super->root_info, fp);
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__setup_root(extent_root, extent_root, &super->extent_info, fp);
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return root;
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}
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static int __update_root(struct ctree_root *root, struct ctree_root_info *info)
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{
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info->tree_root = root->node->blocknr;
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return 0;
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}
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int write_ctree_super(struct ctree_root *root, struct ctree_super_block *s)
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{
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int ret;
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__update_root(root, &s->root_info);
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__update_root(root->extent_root, &s->extent_info);
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ret = pwrite(root->fp, s, sizeof(*s), CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
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if (ret != sizeof(*s)) {
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fprintf(stderr, "failed to write new super block err %d\n", ret);
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return ret;
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}
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return 0;
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}
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int close_ctree(struct ctree_root *root)
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{
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close(root->fp);
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if (root->node)
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tree_block_release(root, root->node);
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if (root->extent_root->node)
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tree_block_release(root->extent_root, root->extent_root->node);
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free(root);
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printf("on close %d blocks are allocated\n", allocated_blocks);
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return 0;
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}
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void tree_block_release(struct ctree_root *root, struct tree_buffer *buf)
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{
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buf->count--;
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if (buf->count < 0)
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BUG();
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if (buf->count == 0) {
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if (!radix_tree_lookup(&root->cache_radix, buf->blocknr))
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BUG();
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radix_tree_delete(&root->cache_radix, buf->blocknr);
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memset(buf, 0, sizeof(*buf));
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free(buf);
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BUG_ON(allocated_blocks == 0);
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allocated_blocks--;
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}
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}
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