1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * alloc.h 5 * 6 * Function prototypes 7 * 8 * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License as published by the Free Software Foundation; either 13 * version 2 of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this program; if not, write to the 22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23 * Boston, MA 021110-1307, USA. 24 */ 25 26 #ifndef OCFS2_ALLOC_H 27 #define OCFS2_ALLOC_H 28 29 struct ocfs2_alloc_context; 30 int ocfs2_insert_extent(struct ocfs2_super *osb, 31 struct ocfs2_journal_handle *handle, 32 struct inode *inode, 33 struct buffer_head *fe_bh, 34 u64 blkno, 35 u32 new_clusters, 36 struct ocfs2_alloc_context *meta_ac); 37 int ocfs2_num_free_extents(struct ocfs2_super *osb, 38 struct inode *inode, 39 struct ocfs2_dinode *fe); 40 /* how many new metadata chunks would an allocation need at maximum? */ 41 static inline int ocfs2_extend_meta_needed(struct ocfs2_dinode *fe) 42 { 43 /* 44 * Rather than do all the work of determining how much we need 45 * (involves a ton of reads and locks), just ask for the 46 * maximal limit. That's a tree depth shift. So, one block for 47 * level of the tree (current l_tree_depth), one block for the 48 * new tree_depth==0 extent_block, and one block at the new 49 * top-of-the tree. 50 */ 51 return le16_to_cpu(fe->id2.i_list.l_tree_depth) + 2; 52 } 53 54 int ocfs2_truncate_log_init(struct ocfs2_super *osb); 55 void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb); 56 void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb, 57 int cancel); 58 int ocfs2_flush_truncate_log(struct ocfs2_super *osb); 59 int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb, 60 int slot_num, 61 struct ocfs2_dinode **tl_copy); 62 int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb, 63 struct ocfs2_dinode *tl_copy); 64 65 struct ocfs2_truncate_context { 66 struct inode *tc_ext_alloc_inode; 67 struct buffer_head *tc_ext_alloc_bh; 68 int tc_ext_alloc_locked; /* is it cluster locked? */ 69 /* these get destroyed once it's passed to ocfs2_commit_truncate. */ 70 struct buffer_head *tc_last_eb_bh; 71 }; 72 73 int ocfs2_prepare_truncate(struct ocfs2_super *osb, 74 struct inode *inode, 75 struct buffer_head *fe_bh, 76 struct ocfs2_truncate_context **tc); 77 int ocfs2_commit_truncate(struct ocfs2_super *osb, 78 struct inode *inode, 79 struct buffer_head *fe_bh, 80 struct ocfs2_truncate_context *tc); 81 82 #endif /* OCFS2_ALLOC_H */ 83