238 lines
7.5 KiB
C
238 lines
7.5 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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struct ocfs2_suballoc_result;
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typedef int (group_search_t)(struct inode *,
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struct buffer_head *,
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u32, /* bits_wanted */
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u32, /* min_bits */
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u64, /* max_block */
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struct ocfs2_suballoc_result *);
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/* found bits */
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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_alloc_slot; /* which slot are we allocating from? */
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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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/* these are used by the chain search */
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u16 ac_chain;
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int ac_disable_chain_relink;
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group_search_t *ac_group_search;
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u64 ac_last_group;
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u64 ac_max_block; /* Highest block number to allocate. 0 is
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is the same as ~0 - unlimited */
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int ac_find_loc_only; /* hack for reflink operation ordering */
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struct ocfs2_suballoc_result *ac_find_loc_priv; /* */
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struct ocfs2_alloc_reservation *ac_resv;
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};
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void ocfs2_init_steal_slots(struct ocfs2_super *osb);
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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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/*
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* Please note that the caller must make sure that root_el is the root
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* of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
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* the result may be wrong.
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*/
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int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
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struct ocfs2_extent_list *root_el,
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struct ocfs2_alloc_context **ac);
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int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
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int blocks,
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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_alloc_context **ac);
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int ocfs2_reserve_clusters(struct ocfs2_super *osb,
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u32 bits_wanted,
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struct ocfs2_alloc_context **ac);
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int ocfs2_alloc_dinode_update_counts(struct inode *inode,
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handle_t *handle,
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struct buffer_head *di_bh,
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u32 num_bits,
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u16 chain);
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void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
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struct buffer_head *di_bh,
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u32 num_bits,
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u16 chain);
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int ocfs2_block_group_set_bits(handle_t *handle,
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struct inode *alloc_inode,
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struct ocfs2_group_desc *bg,
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struct buffer_head *group_bh,
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unsigned int bit_off,
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unsigned int num_bits);
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int ocfs2_claim_metadata(handle_t *handle,
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struct ocfs2_alloc_context *ac,
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u32 bits_wanted,
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u64 *suballoc_loc,
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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(handle_t *handle,
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struct inode *dir,
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struct buffer_head *parent_fe_bh,
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struct ocfs2_alloc_context *ac,
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u64 *suballoc_loc,
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u16 *suballoc_bit,
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u64 *fe_blkno);
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int ocfs2_claim_clusters(handle_t *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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/*
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* Use this variant of ocfs2_claim_clusters to specify a maxiumum
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* number of clusters smaller than the allocation reserved.
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*/
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int __ocfs2_claim_clusters(handle_t *handle,
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struct ocfs2_alloc_context *ac,
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u32 min_clusters,
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u32 max_clusters,
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u32 *cluster_start,
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u32 *num_clusters);
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int ocfs2_free_suballoc_bits(handle_t *handle,
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struct inode *alloc_inode,
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struct buffer_head *alloc_bh,
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unsigned int start_bit,
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u64 bg_blkno,
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unsigned int count);
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int ocfs2_free_dinode(handle_t *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_clusters(handle_t *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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int ocfs2_release_clusters(handle_t *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 u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit)
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{
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u64 group = block - (u64) bit;
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return group;
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}
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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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void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac);
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/* given a cluster offset, calculate which block group it belongs to
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* and return that block offset. */
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u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster);
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/*
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* By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it
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* finds a problem. A caller that wants to check a group descriptor
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* without going readonly should read the block with ocfs2_read_block[s]()
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* and then checking it with this function. This is only resize, really.
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* Everyone else should be using ocfs2_read_group_descriptor().
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*/
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int ocfs2_check_group_descriptor(struct super_block *sb,
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struct ocfs2_dinode *di,
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struct buffer_head *bh);
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/*
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* Read a group descriptor block into *bh. If *bh is NULL, a bh will be
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* allocated. This is a cached read. The descriptor will be validated with
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* ocfs2_validate_group_descriptor().
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*/
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int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
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u64 gd_blkno, struct buffer_head **bh);
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int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et,
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u32 clusters_to_add, u32 extents_to_split,
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struct ocfs2_alloc_context **data_ac,
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struct ocfs2_alloc_context **meta_ac);
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int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res);
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/*
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* The following two interfaces are for ocfs2_create_inode_in_orphan().
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*/
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int ocfs2_find_new_inode_loc(struct inode *dir,
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struct buffer_head *parent_fe_bh,
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struct ocfs2_alloc_context *ac,
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u64 *fe_blkno);
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int ocfs2_claim_new_inode_at_loc(handle_t *handle,
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struct inode *dir,
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struct ocfs2_alloc_context *ac,
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u64 *suballoc_loc,
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u16 *suballoc_bit,
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u64 di_blkno);
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#endif /* _CHAINALLOC_H_ */
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