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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 */ |