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- /*
- * index.h - Defines for NTFS index handling. Part of the Linux-NTFS project.
- *
- * Copyright (c) 2004 Anton Altaparmakov
- * Copyright (c) 2005 Yura Pakhuchiy
- *
- * This program/include file is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program/include file is distributed in the hope that it will be
- * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program (in the main directory of the Linux-NTFS
- * distribution in the file COPYING); if not, write to the Free Software
- * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
- #ifndef _NTFS_INDEX_H
- #define _NTFS_INDEX_H
-
- #include "attrib.h"
- #include "types.h"
- #include "layout.h"
- #include "inode.h"
- #include "mft.h"
-
- /**
- * @ni: inode containing the @entry described by this context
- * @name: name of the index described by this context
- * @name_len: length of the index name
- * @entry: index entry (points into @ir or @ia)
- * @data: index entry data (points into @entry)
- * @data_len: length in bytes of @data
- * @is_in_root: TRUE if @entry is in @ir and FALSE if it is in @ia
- * @ir: index root if @is_in_root and NULL otherwise
- * @actx: attribute search context if @is_in_root and NULL otherwise
- * @ia: index block if @is_in_root is FALSE and NULL otherwise
- * @ia_na: opened INDEX_ALLOCATION attribute
- * @ia_vcn: VCN from which @ia where read from
- * @ia_dirty: TRUE if index block was changed
- * @block_size: index block size
- *
- * @ni is the inode this context belongs to.
- *
- * @entry is the index entry described by this context. @data and @data_len
- * are the index entry data and its length in bytes, respectively. @data
- * simply points into @entry. This is probably what the user is interested in.
- *
- * If @is_in_root is TRUE, @entry is in the index root attribute @ir described
- * by the attribute search context @actx and inode @ni. @ia, @ia_vcn and
- * @ia_dirty are undefined in this case.
- *
- * If @is_in_root is FALSE, @entry is in the index allocation attribute and @ia
- * and @ia_vcn point to the index allocation block and VCN where it's placed,
- * respectively. @ir and @actx are NULL in this case. @ia_na is opened
- * INDEX_ALLOCATION attribute. @ia_dirty is TRUE if index block was changed and
- * FALSE otherwise.
- *
- * To obtain a context call ntfs_index_ctx_get().
- *
- * When finished with the @entry and its @data, call ntfs_index_ctx_put() to
- * free the context and other associated resources.
- *
- * If the index entry was modified, call ntfs_index_entry_mark_dirty() before
- * the call to ntfs_index_ctx_put() to ensure that the changes are written
- * to disk.
- */
- typedef struct {
- ntfs_inode *ni;
- ntfschar *name;
- u32 name_len;
- INDEX_ENTRY *entry;
- void *data;
- u16 data_len;
- BOOL is_in_root;
- INDEX_ROOT *ir;
- ntfs_attr_search_ctx *actx;
- INDEX_ALLOCATION *ia;
- ntfs_attr *ia_na;
- VCN ia_vcn;
- BOOL ia_dirty;
- u32 block_size;
- } ntfs_index_context;
-
- extern ntfs_index_context *ntfs_index_ctx_get(ntfs_inode *ni,
- ntfschar *name, u32 name_len);
- extern void ntfs_index_ctx_put(ntfs_index_context *ictx);
- extern void ntfs_index_ctx_reinit(ntfs_index_context *ictx);
-
- extern int ntfs_index_lookup(const void *key, const int key_len,
- ntfs_index_context *ictx);
-
- extern int ntfs_index_add_filename(ntfs_inode *ni, FILE_NAME_ATTR *fn,
- MFT_REF mref);
- extern int ntfs_index_rm(ntfs_index_context *ictx);
-
- /**
- * ntfs_index_entry_mark_dirty - mark an index entry dirty
- * @ictx: ntfs index context describing the index entry
- *
- * Mark the index entry described by the index entry context @ictx dirty.
- *
- * If the index entry is in the index root attribute, simply mark the inode
- * containing the index root attribute dirty. This ensures the mftrecord, and
- * hence the index root attribute, will be written out to disk later.
- *
- * If the index entry is in an index block belonging to the index allocation
- * attribute, set ia_dirty to TRUE, thus index block will be updated during
- * ntfs_index_ctx_put.
- */
- static inline void ntfs_index_entry_mark_dirty(ntfs_index_context *ictx)
- {
- if (ictx->is_in_root)
- ntfs_inode_mark_dirty(ictx->actx->ntfs_ino);
- else
- ictx->ia_dirty = TRUE;
- }
-
- #endif /* _NTFS_INDEX_H */
-