forked from luck/tmp_suning_uos_patched
883d4cae4a
Record the most recently used allocation group on the allocation context, so that subsequent allocations can attempt to optimize for contiguousness. Local alloc especially should benefit from this as the current chain search tends to let it spew across the disk. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
135 lines
4.2 KiB
C
135 lines
4.2 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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* suballoc.h
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*
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* Defines sub allocator api
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*
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* Copyright (C) 2003, 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 _CHAINALLOC_H_
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#define _CHAINALLOC_H_
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typedef int (group_search_t)(struct inode *,
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struct buffer_head *,
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u32,
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u32,
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u16 *,
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u16 *);
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struct ocfs2_alloc_context {
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struct inode *ac_inode; /* which bitmap are we allocating from? */
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struct buffer_head *ac_bh; /* file entry bh */
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u32 ac_bits_wanted;
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u32 ac_bits_given;
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#define OCFS2_AC_USE_LOCAL 1
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#define OCFS2_AC_USE_MAIN 2
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#define OCFS2_AC_USE_INODE 3
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#define OCFS2_AC_USE_META 4
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u32 ac_which;
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struct ocfs2_journal_handle *ac_handle;
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/* these are used by the chain search */
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u16 ac_chain;
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int ac_allow_chain_relink;
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group_search_t *ac_group_search;
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u64 ac_last_group;
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};
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void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac);
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static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac)
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{
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return ac->ac_bits_wanted - ac->ac_bits_given;
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}
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int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
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struct ocfs2_journal_handle *handle,
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struct ocfs2_dinode *fe,
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struct ocfs2_alloc_context **ac);
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int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
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struct ocfs2_journal_handle *handle,
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struct ocfs2_alloc_context **ac);
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int ocfs2_reserve_clusters(struct ocfs2_super *osb,
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struct ocfs2_journal_handle *handle,
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u32 bits_wanted,
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struct ocfs2_alloc_context **ac);
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int ocfs2_claim_metadata(struct ocfs2_super *osb,
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struct ocfs2_journal_handle *handle,
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struct ocfs2_alloc_context *ac,
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u32 bits_wanted,
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u16 *suballoc_bit_start,
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u32 *num_bits,
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u64 *blkno_start);
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int ocfs2_claim_new_inode(struct ocfs2_super *osb,
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struct ocfs2_journal_handle *handle,
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struct ocfs2_alloc_context *ac,
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u16 *suballoc_bit,
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u64 *fe_blkno);
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int ocfs2_claim_clusters(struct ocfs2_super *osb,
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struct ocfs2_journal_handle *handle,
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struct ocfs2_alloc_context *ac,
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u32 min_clusters,
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u32 *cluster_start,
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u32 *num_clusters);
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int ocfs2_free_dinode(struct ocfs2_journal_handle *handle,
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struct inode *inode_alloc_inode,
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struct buffer_head *inode_alloc_bh,
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struct ocfs2_dinode *di);
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int ocfs2_free_extent_block(struct ocfs2_journal_handle *handle,
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struct inode *eb_alloc_inode,
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struct buffer_head *eb_alloc_bh,
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struct ocfs2_extent_block *eb);
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int ocfs2_free_clusters(struct ocfs2_journal_handle *handle,
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struct inode *bitmap_inode,
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struct buffer_head *bitmap_bh,
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u64 start_blk,
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unsigned int num_clusters);
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static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb,
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u64 bg_blkno)
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{
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/* This should work for all block group descriptors as only
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* the 1st group descriptor of the cluster bitmap is
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* different. */
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if (bg_blkno == osb->first_cluster_group_blkno)
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return 0;
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/* the rest of the block groups are located at the beginning
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* of their 1st cluster, so a direct translation just
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* works. */
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return ocfs2_blocks_to_clusters(osb->sb, bg_blkno);
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}
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static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
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{
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno;
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}
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/* This is for local alloc ONLY. Others should use the task-specific
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* apis above. */
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int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
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struct ocfs2_alloc_context *ac);
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#endif /* _CHAINALLOC_H_ */
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