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063c4561f5
Provide an internal interface for the removal of arbitrary file regions. ocfs2_remove_inode_range() takes a byte range within a file and will remove existing extents within that range. Partial clusters will be zeroed so that any read from within the region will return zeros. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
143 lines
5.1 KiB
C
143 lines
5.1 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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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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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_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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