fs/ntfs/attrib.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * attrib.h - Defines for attribute handling in NTFS Linux kernel driver.
   4  *            Part of the Linux-NTFS project.
   5  *
   6  * Copyright (c) 2001-2005 Anton Altaparmakov
   7  * Copyright (c) 2002 Richard Russon
   8  */
   9
  10 #ifndef _LINUX_NTFS_ATTRIB_H
  11 #define _LINUX_NTFS_ATTRIB_H
  12
  13 #include "endian.h"
  14 #include "types.h"
  15 #include "layout.h"
  16 #include "inode.h"
  17 #include "runlist.h"
  18 #include "volume.h"
  19
  20 /**
  21  * ntfs_attr_search_ctx - used in attribute search functions
  22  * @mrec:       buffer containing mft record to search
  23  * @attr:       attribute record in @mrec where to begin/continue search
  24  * @is_first:   if true ntfs_attr_lookup() begins search with @attr, else after
  25  *
  26  * Structure must be initialized to zero before the first call to one of the
  27  * attribute search functions. Initialize @mrec to point to the mft record to
  28  * search, and @attr to point to the first attribute within @mrec (not necessary
  29  * if calling the _first() functions), and set @is_first to 'true' (not necessary
  30  * if calling the _first() functions).
  31  *
  32  * If @is_first is 'true', the search begins with @attr. If @is_first is 'false',
  33  * the search begins after @attr. This is so that, after the first call to one
  34  * of the search attribute functions, we can call the function again, without
  35  * any modification of the search context, to automagically get the next
  36  * matching attribute.
  37  */
  38 typedef struct {
  39         MFT_RECORD *mrec;
  40         ATTR_RECORD *attr;
  41         bool is_first;
  42         ntfs_inode *ntfs_ino;
  43         ATTR_LIST_ENTRY *al_entry;
  44         ntfs_inode *base_ntfs_ino;
  45         MFT_RECORD *base_mrec;
  46         ATTR_RECORD *base_attr;
  47 } ntfs_attr_search_ctx;
  48
  49 extern int ntfs_map_runlist_nolock(ntfs_inode *ni, VCN vcn,
  50                 ntfs_attr_search_ctx *ctx);
  51 extern int ntfs_map_runlist(ntfs_inode *ni, VCN vcn);
  52
  53 extern LCN ntfs_attr_vcn_to_lcn_nolock(ntfs_inode *ni, const VCN vcn,
  54                 const bool write_locked);
  55
  56 extern runlist_element *ntfs_attr_find_vcn_nolock(ntfs_inode *ni,
  57                 const VCN vcn, ntfs_attr_search_ctx *ctx);
  58
  59 int ntfs_attr_lookup(const ATTR_TYPE type, const ntfschar *name,
  60                 const u32 name_len, const IGNORE_CASE_BOOL ic,
  61                 const VCN lowest_vcn, const u8 *val, const u32 val_len,
  62                 ntfs_attr_search_ctx *ctx);
  63
  64 extern int load_attribute_list(ntfs_volume *vol, runlist *rl, u8 *al_start,
  65                 const s64 size, const s64 initialized_size);
  66
  67 static inline s64 ntfs_attr_size(const ATTR_RECORD *a)
  68 {
  69         if (!a->non_resident)
  70                 return (s64)le32_to_cpu(a->data.resident.value_length);
  71         return sle64_to_cpu(a->data.non_resident.data_size);
  72 }
  73
  74 extern void ntfs_attr_reinit_search_ctx(ntfs_attr_search_ctx *ctx);
  75 extern ntfs_attr_search_ctx *ntfs_attr_get_search_ctx(ntfs_inode *ni,
  76                 MFT_RECORD *mrec);
  77 extern void ntfs_attr_put_search_ctx(ntfs_attr_search_ctx *ctx);
  78
  79 #ifdef NTFS_RW
  80
  81 extern int ntfs_attr_size_bounds_check(const ntfs_volume *vol,
  82                 const ATTR_TYPE type, const s64 size);
  83 extern int ntfs_attr_can_be_non_resident(const ntfs_volume *vol,
  84                 const ATTR_TYPE type);
  85 extern int ntfs_attr_can_be_resident(const ntfs_volume *vol,
  86                 const ATTR_TYPE type);
  87
  88 extern int ntfs_attr_record_resize(MFT_RECORD *m, ATTR_RECORD *a, u32 new_size);
  89 extern int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,
  90                 const u32 new_size);
  91
  92 extern int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size);
  93
  94 extern s64 ntfs_attr_extend_allocation(ntfs_inode *ni, s64 new_alloc_size,
  95                 const s64 new_data_size, const s64 data_start);
  96
  97 extern int ntfs_attr_set(ntfs_inode *ni, const s64 ofs, const s64 cnt,
  98                 const u8 val);
  99
 100 #endif /* NTFS_RW */
 101
 102 #endif /* _LINUX_NTFS_ATTRIB_H */