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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [ocfs2/] [alloc.h] - Blame information for rev 62

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1 62 marcus.erl
/* -*- 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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                        u8 flags,
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                        struct ocfs2_alloc_context *meta_ac);
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struct ocfs2_cached_dealloc_ctxt;
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int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *di_bh,
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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, struct buffer_head *di_bh,
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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_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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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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#endif /* OCFS2_ALLOC_H */

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