| Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 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 */ |