forked from Mirrors/btrfs-progs
108 lines
2.7 KiB
C
108 lines
2.7 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 <stdio.h>
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#include <stdlib.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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#include "transaction.h"
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/*
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* walks the btree of allocated inodes and find a hole.
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*/
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int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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u64 dirid, u64 *objectid)
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{
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struct btrfs_path path;
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struct btrfs_key key;
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int ret;
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u64 hole_size = 0;
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int slot = 0;
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u64 last_ino = 0;
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int start_found;
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struct btrfs_leaf *l;
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struct btrfs_key search_key;
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u64 search_start = dirid;
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if (root->fs_info->last_inode_alloc_dirid == dirid)
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search_start = root->fs_info->last_inode_alloc;
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if (search_start < BTRFS_FIRST_FREE_OBJECTID)
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search_start = BTRFS_FIRST_FREE_OBJECTID;
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search_key.objectid = search_start;
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search_key.flags = 0;
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search_key.offset = 0;
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btrfs_init_path(&path);
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start_found = 0;
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ret = btrfs_search_slot(trans, root, &search_key, &path, 0, 0);
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if (ret < 0)
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goto error;
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if (path.slots[0] > 0)
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path.slots[0]--;
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while (1) {
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l = &path.nodes[0]->leaf;
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slot = path.slots[0];
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if (slot >= btrfs_header_nritems(&l->header)) {
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ret = btrfs_next_leaf(root, &path);
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if (ret == 0)
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continue;
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if (ret < 0)
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goto error;
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if (!start_found) {
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*objectid = search_start;
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start_found = 1;
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goto found;
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}
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*objectid = last_ino > search_start ?
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last_ino : search_start;
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goto found;
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}
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btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
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if (key.objectid >= search_start) {
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if (start_found) {
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if (last_ino < search_start)
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last_ino = search_start;
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hole_size = key.objectid - last_ino;
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if (hole_size > 0) {
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*objectid = last_ino;
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goto found;
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}
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}
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}
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start_found = 1;
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last_ino = key.objectid + 1;
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path.slots[0]++;
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}
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// FIXME -ENOSPC
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found:
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root->fs_info->last_inode_alloc = *objectid;
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root->fs_info->last_inode_alloc_dirid = dirid;
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btrfs_release_path(root, &path);
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BUG_ON(*objectid < search_start);
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return 0;
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error:
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btrfs_release_path(root, &path);
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return ret;
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}
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