reactos/drivers/fs/ntfs/linux-ntfs/attrib.h

   1 /*
   2  * attrib.h - Defines for attribute handling in NTFS Linux kernel driver.
   3  *            Part of the Linux-NTFS project.
   4  *
   5  * Copyright (c) 2001-2003 Anton Altaparmakov
   6  * Copyright (c) 2002 Richard Russon
   7  *
   8  * This program/include file is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as published
  10  * by the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program/include file is distributed in the hope that it will be
  14  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program (in the main directory of the Linux-NTFS
  20  * distribution in the file COPYING); if not, write to the Free Software
  21  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #ifndef _LINUX_NTFS_ATTRIB_H
  25 #define _LINUX_NTFS_ATTRIB_H
  26
  27 #include <linux/fs.h>
  28
  29 #include "endian.h"
  30 #include "types.h"
  31 #include "layout.h"
  32
  33 static inline void init_run_list(run_list *rl)
  34 {
  35         rl->rl = NULL;
  36         init_rwsem(&rl->lock);
  37 }
  38
  39 typedef enum {
  40         LCN_HOLE                = -1,   /* Keep this as highest value or die! */
  41         LCN_RL_NOT_MAPPED       = -2,
  42         LCN_ENOENT              = -3,
  43         LCN_EINVAL              = -4,
  44 } LCN_SPECIAL_VALUES;
  45
  46 /**
  47  * attr_search_context - used in attribute search functions
  48  * @mrec:       buffer containing mft record to search
  49  * @attr:       attribute record in @mrec where to begin/continue search
  50  * @is_first:   if true lookup_attr() begins search with @attr, else after @attr
  51  *
  52  * Structure must be initialized to zero before the first call to one of the
  53  * attribute search functions. Initialize @mrec to point to the mft record to
  54  * search, and @attr to point to the first attribute within @mrec (not necessary
  55  * if calling the _first() functions), and set @is_first to TRUE (not necessary
  56  * if calling the _first() functions).
  57  *
  58  * If @is_first is TRUE, the search begins with @attr. If @is_first is FALSE,
  59  * the search begins after @attr. This is so that, after the first call to one
  60  * of the search attribute functions, we can call the function again, without
  61  * any modification of the search context, to automagically get the next
  62  * matching attribute.
  63  */
  64 typedef struct {
  65         MFT_RECORD *mrec;
  66         ATTR_RECORD *attr;
  67         BOOL is_first;
  68         ntfs_inode *ntfs_ino;
  69         ATTR_LIST_ENTRY *al_entry;
  70         ntfs_inode *base_ntfs_ino;
  71         MFT_RECORD *base_mrec;
  72         ATTR_RECORD *base_attr;
  73 } attr_search_context;
  74
  75 extern run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
  76                 const ATTR_RECORD *attr, run_list_element *old_rl);
  77
  78 extern int map_run_list(ntfs_inode *ni, VCN vcn);
  79
  80 extern LCN vcn_to_lcn(const run_list_element *rl, const VCN vcn);
  81
  82 extern BOOL find_attr(const ATTR_TYPES type, const uchar_t *name,
  83                 const u32 name_len, const IGNORE_CASE_BOOL ic, const u8 *val,
  84                 const u32 val_len, attr_search_context *ctx);
  85
  86 BOOL lookup_attr(const ATTR_TYPES type, const uchar_t *name, const u32 name_len,
  87                 const IGNORE_CASE_BOOL ic, const VCN lowest_vcn, const u8 *val,
  88                 const u32 val_len, attr_search_context *ctx);
  89
  90 extern int load_attribute_list(ntfs_volume *vol, run_list *rl, u8 *al_start,
  91                 const s64 size, const s64 initialized_size);
  92
  93 static inline s64 attribute_value_length(const ATTR_RECORD *a)
  94 {
  95         if (!a->non_resident)
  96                 return (s64)le32_to_cpu(a->data.resident.value_length);
  97         return sle64_to_cpu(a->data.non_resident.data_size);
  98 }
  99
 100 extern void reinit_attr_search_ctx(attr_search_context *ctx);
 101 extern attr_search_context *get_attr_search_ctx(ntfs_inode *ni,
 102                 MFT_RECORD *mrec);
 103 extern void put_attr_search_ctx(attr_search_context *ctx);
 104
 105 #endif /* _LINUX_NTFS_ATTRIB_H */
 106