231 lines
7.9 KiB
C
231 lines
7.9 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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/*
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* For xattr tree leaf, we limit the leaf byte size to be 64K.
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*/
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#define OCFS2_MAX_XATTR_TREE_LEAF_SIZE 65536
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/*
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* ocfs2_extent_tree and ocfs2_extent_tree_operations are used to abstract
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* the b-tree operations in ocfs2. Now all the b-tree operations are not
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* limited to ocfs2_dinode only. Any data which need to allocate clusters
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* to store can use b-tree. And it only needs to implement its ocfs2_extent_tree
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* and operation.
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*
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* ocfs2_extent_tree becomes the first-class object for extent tree
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* manipulation. Callers of the alloc.c code need to fill it via one of
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* the ocfs2_init_*_extent_tree() operations below.
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*
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* ocfs2_extent_tree contains info for the root of the b-tree, it must have a
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* root ocfs2_extent_list and a root_bh so that they can be used in the b-tree
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* functions.
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* ocfs2_extent_tree_operations abstract the normal operations we do for
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* the root of extent b-tree.
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*/
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struct ocfs2_extent_tree_operations;
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struct ocfs2_extent_tree {
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struct ocfs2_extent_tree_operations *et_ops;
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struct buffer_head *et_root_bh;
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struct ocfs2_extent_list *et_root_el;
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void *et_object;
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unsigned int et_max_leaf_clusters;
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};
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/*
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* ocfs2_init_*_extent_tree() will fill an ocfs2_extent_tree from the
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* specified object buffer.
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*/
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void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
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struct inode *inode,
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struct buffer_head *bh);
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void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
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struct inode *inode,
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struct buffer_head *bh);
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void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
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struct inode *inode,
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struct buffer_head *bh,
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struct ocfs2_xattr_value_root *xv);
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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 ocfs2_extent_tree *et,
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u32 cpos,
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u64 start_blk,
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u32 new_clusters,
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u8 flags,
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struct ocfs2_alloc_context *meta_ac);
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enum ocfs2_alloc_restarted {
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RESTART_NONE = 0,
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RESTART_TRANS,
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RESTART_META
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};
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int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
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struct inode *inode,
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u32 *logical_offset,
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u32 clusters_to_add,
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int mark_unwritten,
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struct ocfs2_extent_tree *et,
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handle_t *handle,
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struct ocfs2_alloc_context *data_ac,
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struct ocfs2_alloc_context *meta_ac,
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enum ocfs2_alloc_restarted *reason_ret);
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struct ocfs2_cached_dealloc_ctxt;
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int ocfs2_mark_extent_written(struct inode *inode,
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struct ocfs2_extent_tree *et,
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handle_t *handle, u32 cpos, u32 len, u32 phys,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc);
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int ocfs2_remove_extent(struct inode *inode,
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struct ocfs2_extent_tree *et,
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u32 cpos, u32 len, handle_t *handle,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc);
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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_extent_tree *et);
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/*
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* how many new metadata chunks would an allocation need at maximum?
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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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static inline int ocfs2_extend_meta_needed(struct ocfs2_extent_list *root_el)
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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(root_el->l_tree_depth) + 2;
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}
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void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di);
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void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di);
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int ocfs2_convert_inline_data_to_extents(struct inode *inode,
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struct buffer_head *di_bh);
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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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int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb);
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int ocfs2_truncate_log_append(struct ocfs2_super *osb,
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handle_t *handle,
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u64 start_blk,
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unsigned int num_clusters);
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int __ocfs2_flush_truncate_log(struct ocfs2_super *osb);
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/*
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* Process local structure which describes the block unlinks done
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* during an operation. This is populated via
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* ocfs2_cache_block_dealloc().
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*
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* ocfs2_run_deallocs() should be called after the potentially
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* de-allocating routines. No journal handles should be open, and most
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* locks should have been dropped.
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*/
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struct ocfs2_cached_dealloc_ctxt {
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struct ocfs2_per_slot_free_list *c_first_suballocator;
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};
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static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c)
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{
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c->c_first_suballocator = NULL;
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}
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int ocfs2_run_deallocs(struct ocfs2_super *osb,
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struct ocfs2_cached_dealloc_ctxt *ctxt);
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struct ocfs2_truncate_context {
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struct ocfs2_cached_dealloc_ctxt tc_dealloc;
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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_zero_range_for_truncate(struct inode *inode, handle_t *handle,
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u64 range_start, u64 range_end);
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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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int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
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unsigned int start, unsigned int end, int trunc);
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int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
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u32 cpos, struct buffer_head **leaf_bh);
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int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster);
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/*
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* Helper function to look at the # of clusters in an extent record.
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*/
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static inline unsigned int ocfs2_rec_clusters(struct ocfs2_extent_list *el,
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struct ocfs2_extent_rec *rec)
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{
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/*
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* Cluster count in extent records is slightly different
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* between interior nodes and leaf nodes. This is to support
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* unwritten extents which need a flags field in leaf node
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* records, thus shrinking the available space for a clusters
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* field.
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*/
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if (el->l_tree_depth)
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return le32_to_cpu(rec->e_int_clusters);
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else
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return le16_to_cpu(rec->e_leaf_clusters);
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}
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/*
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* This is only valid for leaf nodes, which are the only ones that can
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* have empty extents anyway.
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*/
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static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec)
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{
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return !rec->e_leaf_clusters;
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}
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#endif /* OCFS2_ALLOC_H */
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