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dcd0538ff4
Introduce tree rotations into the b-tree code. This will allow ocfs2 to support sparse files. Much of the added code is designed to be generic (in the ocfs2 sense) so that it can later be re-used to implement large extended attributes. This patch only adds the rotation code and does minimal updates to callers of the extent api. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* alloc.h
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*
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* Function prototypes
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*
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* Copyright (C) 2002, 2004 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 as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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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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#ifndef OCFS2_ALLOC_H
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#define OCFS2_ALLOC_H
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struct ocfs2_alloc_context;
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int ocfs2_insert_extent(struct ocfs2_super *osb,
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handle_t *handle,
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struct inode *inode,
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struct buffer_head *fe_bh,
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u32 cpos,
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u64 start_blk,
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u32 new_clusters,
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struct ocfs2_alloc_context *meta_ac);
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int ocfs2_num_free_extents(struct ocfs2_super *osb,
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struct inode *inode,
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struct ocfs2_dinode *fe);
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/* how many new metadata chunks would an allocation need at maximum? */
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static inline int ocfs2_extend_meta_needed(struct ocfs2_dinode *fe)
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{
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/*
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* Rather than do all the work of determining how much we need
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* (involves a ton of reads and locks), just ask for the
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* maximal limit. That's a tree depth shift. So, one block for
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* level of the tree (current l_tree_depth), one block for the
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* new tree_depth==0 extent_block, and one block at the new
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* top-of-the tree.
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*/
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return le16_to_cpu(fe->id2.i_list.l_tree_depth) + 2;
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}
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int ocfs2_truncate_log_init(struct ocfs2_super *osb);
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void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb);
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void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
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int cancel);
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int ocfs2_flush_truncate_log(struct ocfs2_super *osb);
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int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
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int slot_num,
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struct ocfs2_dinode **tl_copy);
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int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
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struct ocfs2_dinode *tl_copy);
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struct ocfs2_truncate_context {
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struct inode *tc_ext_alloc_inode;
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struct buffer_head *tc_ext_alloc_bh;
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int tc_ext_alloc_locked; /* is it cluster locked? */
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/* these get destroyed once it's passed to ocfs2_commit_truncate. */
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struct buffer_head *tc_last_eb_bh;
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};
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int ocfs2_prepare_truncate(struct ocfs2_super *osb,
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struct inode *inode,
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struct buffer_head *fe_bh,
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struct ocfs2_truncate_context **tc);
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int ocfs2_commit_truncate(struct ocfs2_super *osb,
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struct inode *inode,
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struct buffer_head *fe_bh,
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struct ocfs2_truncate_context *tc);
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#endif /* OCFS2_ALLOC_H */
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