149 lines
5.5 KiB
C
149 lines
5.5 KiB
C
/*
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* index.h - Defines for NTFS kernel index handling. Part of the Linux-NTFS
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* project.
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*
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* Copyright (c) 2004 Anton Altaparmakov
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_NTFS_INDEX_H
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#define _LINUX_NTFS_INDEX_H
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#include <linux/fs.h>
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#include "types.h"
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#include "layout.h"
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#include "inode.h"
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#include "attrib.h"
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#include "mft.h"
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#include "aops.h"
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/**
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* @idx_ni: index inode containing the @entry described by this context
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* @entry: index entry (points into @ir or @ia)
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* @data: index entry data (points into @entry)
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* @data_len: length in bytes of @data
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* @is_in_root: 'true' if @entry is in @ir and 'false' if it is in @ia
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* @ir: index root if @is_in_root and NULL otherwise
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* @actx: attribute search context if @is_in_root and NULL otherwise
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* @base_ni: base inode if @is_in_root and NULL otherwise
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* @ia: index block if @is_in_root is 'false' and NULL otherwise
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* @page: page if @is_in_root is 'false' and NULL otherwise
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*
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* @idx_ni is the index inode this context belongs to.
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*
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* @entry is the index entry described by this context. @data and @data_len
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* are the index entry data and its length in bytes, respectively. @data
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* simply points into @entry. This is probably what the user is interested in.
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*
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* If @is_in_root is 'true', @entry is in the index root attribute @ir described
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* by the attribute search context @actx and the base inode @base_ni. @ia and
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* @page are NULL in this case.
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*
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* If @is_in_root is 'false', @entry is in the index allocation attribute and @ia
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* and @page point to the index allocation block and the mapped, locked page it
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* is in, respectively. @ir, @actx and @base_ni are NULL in this case.
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*
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* To obtain a context call ntfs_index_ctx_get().
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*
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* We use this context to allow ntfs_index_lookup() to return the found index
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* @entry and its @data without having to allocate a buffer and copy the @entry
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* and/or its @data into it.
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*
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* When finished with the @entry and its @data, call ntfs_index_ctx_put() to
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* free the context and other associated resources.
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*
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* If the index entry was modified, call flush_dcache_index_entry_page()
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* immediately after the modification and either ntfs_index_entry_mark_dirty()
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* or ntfs_index_entry_write() before the call to ntfs_index_ctx_put() to
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* ensure that the changes are written to disk.
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*/
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typedef struct {
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ntfs_inode *idx_ni;
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INDEX_ENTRY *entry;
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void *data;
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u16 data_len;
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bool is_in_root;
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INDEX_ROOT *ir;
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ntfs_attr_search_ctx *actx;
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ntfs_inode *base_ni;
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INDEX_ALLOCATION *ia;
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struct page *page;
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} ntfs_index_context;
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extern ntfs_index_context *ntfs_index_ctx_get(ntfs_inode *idx_ni);
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extern void ntfs_index_ctx_put(ntfs_index_context *ictx);
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extern int ntfs_index_lookup(const void *key, const int key_len,
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ntfs_index_context *ictx);
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#ifdef NTFS_RW
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/**
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* ntfs_index_entry_flush_dcache_page - flush_dcache_page() for index entries
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* @ictx: ntfs index context describing the index entry
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*
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* Call flush_dcache_page() for the page in which an index entry resides.
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*
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* This must be called every time an index entry is modified, just after the
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* modification.
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*
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* If the index entry is in the index root attribute, simply flush the page
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* containing the mft record containing the index root attribute.
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*
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* If the index entry is in an index block belonging to the index allocation
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* attribute, simply flush the page cache page containing the index block.
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*/
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static inline void ntfs_index_entry_flush_dcache_page(ntfs_index_context *ictx)
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{
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if (ictx->is_in_root)
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flush_dcache_mft_record_page(ictx->actx->ntfs_ino);
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else
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flush_dcache_page(ictx->page);
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}
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/**
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* ntfs_index_entry_mark_dirty - mark an index entry dirty
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* @ictx: ntfs index context describing the index entry
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*
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* Mark the index entry described by the index entry context @ictx dirty.
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*
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* If the index entry is in the index root attribute, simply mark the mft
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* record containing the index root attribute dirty. This ensures the mft
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* record, and hence the index root attribute, will be written out to disk
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* later.
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*
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* If the index entry is in an index block belonging to the index allocation
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* attribute, mark the buffers belonging to the index record as well as the
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* page cache page the index block is in dirty. This automatically marks the
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* VFS inode of the ntfs index inode to which the index entry belongs dirty,
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* too (I_DIRTY_PAGES) and this in turn ensures the page buffers, and hence the
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* dirty index block, will be written out to disk later.
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*/
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static inline void ntfs_index_entry_mark_dirty(ntfs_index_context *ictx)
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{
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if (ictx->is_in_root)
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mark_mft_record_dirty(ictx->actx->ntfs_ino);
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else
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mark_ntfs_record_dirty(ictx->page,
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(u8*)ictx->ia - (u8*)page_address(ictx->page));
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}
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#endif /* NTFS_RW */
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#endif /* _LINUX_NTFS_INDEX_H */
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