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libntfs/source/attrib.h

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/*
* attrib.h - Exports for attribute handling. Originated from the Linux-NTFS project.
*
* Copyright (c) 2000-2004 Anton Altaparmakov
* Copyright (c) 2004-2005 Yura Pakhuchiy
* Copyright (c) 2006-2007 Szabolcs Szakacsits
*
* 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 NTFS-3G
* 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_ATTRIB_H
#define _NTFS_ATTRIB_H
/* Forward declarations */
typedef struct _ntfs_attr ntfs_attr;
typedef struct _ntfs_attr_search_ctx ntfs_attr_search_ctx;
#include "types.h"
#include "inode.h"
#include "unistr.h"
#include "runlist.h"
#include "volume.h"
#include "debug.h"
#include "logging.h"
extern ntfschar AT_UNNAMED[];
extern ntfschar STREAM_SDS[];
/* The little endian Unicode string $TXF_DATA as a global constant. */
extern ntfschar TXF_DATA[10];
/**
* enum ntfs_lcn_special_values - special return values for ntfs_*_vcn_to_lcn()
*
* Special return values for ntfs_rl_vcn_to_lcn() and ntfs_attr_vcn_to_lcn().
*
* TODO: Describe them.
*/
typedef enum {
LCN_HOLE = -1, /* Keep this as highest value or die! */
LCN_RL_NOT_MAPPED = -2,
LCN_ENOENT = -3,
LCN_EINVAL = -4,
LCN_EIO = -5,
} ntfs_lcn_special_values;
/**
* struct ntfs_attr_search_ctx - search context used in attribute search functions
* @mrec: buffer containing mft record to search
* @attr: attribute record in @mrec where to begin/continue search
* @is_first: if true lookup_attr() begins search with @attr, else after @attr
*
* Structure must be initialized to zero before the first call to one of the
* attribute search functions. Initialize @mrec to point to the mft record to
* search, and @attr to point to the first attribute within @mrec (not necessary
* if calling the _first() functions), and set @is_first to TRUE (not necessary
* if calling the _first() functions).
*
* If @is_first is TRUE, the search begins with @attr. If @is_first is FALSE,
* the search begins after @attr. This is so that, after the first call to one
* of the search attribute functions, we can call the function again, without
* any modification of the search context, to automagically get the next
* matching attribute.
*/
struct _ntfs_attr_search_ctx {
MFT_RECORD *mrec;
ATTR_RECORD *attr;
BOOL is_first;
ntfs_inode *ntfs_ino;
ATTR_LIST_ENTRY *al_entry;
ntfs_inode *base_ntfs_ino;
MFT_RECORD *base_mrec;
ATTR_RECORD *base_attr;
};
extern void ntfs_attr_reinit_search_ctx(ntfs_attr_search_ctx *ctx);
extern ntfs_attr_search_ctx *ntfs_attr_get_search_ctx(ntfs_inode *ni,
MFT_RECORD *mrec);
extern void ntfs_attr_put_search_ctx(ntfs_attr_search_ctx *ctx);
extern int ntfs_attr_lookup(const ATTR_TYPES type, const ntfschar *name,
const u32 name_len, const IGNORE_CASE_BOOL ic,
const VCN lowest_vcn, const u8 *val, const u32 val_len,
ntfs_attr_search_ctx *ctx);
extern int ntfs_attr_position(const ATTR_TYPES type, ntfs_attr_search_ctx *ctx);
extern ATTR_DEF *ntfs_attr_find_in_attrdef(const ntfs_volume *vol,
const ATTR_TYPES type);
/**
* ntfs_attrs_walk - syntactic sugar for walking all attributes in an inode
* @ctx: initialised attribute search context
*
* Syntactic sugar for walking attributes in an inode.
*
* Return 0 on success and -1 on error with errno set to the error code from
* ntfs_attr_lookup().
*
* Example: When you want to enumerate all attributes in an open ntfs inode
* @ni, you can simply do:
*
* int err;
* ntfs_attr_search_ctx *ctx = ntfs_attr_get_search_ctx(ni, NULL);
* if (!ctx)
* // Error code is in errno. Handle this case.
* while (!(err = ntfs_attrs_walk(ctx))) {
* ATTR_RECORD *attr = ctx->attr;
* // attr now contains the next attribute. Do whatever you want
* // with it and then just continue with the while loop.
* }
* if (err && errno != ENOENT)
* // Ooops. An error occurred! You should handle this case.
* // Now finished with all attributes in the inode.
*/
static __inline__ int ntfs_attrs_walk(ntfs_attr_search_ctx *ctx)
{
return ntfs_attr_lookup(AT_UNUSED, NULL, 0, CASE_SENSITIVE, 0,
NULL, 0, ctx);
}
/**
* struct ntfs_attr - ntfs in memory non-resident attribute structure
* @rl: if not NULL, the decompressed runlist
* @ni: base ntfs inode to which this attribute belongs
* @type: attribute type
* @name: Unicode name of the attribute
* @name_len: length of @name in Unicode characters
* @state: NTFS attribute specific flags describing this attribute
* @allocated_size: copy from the attribute record
* @data_size: copy from the attribute record
* @initialized_size: copy from the attribute record
* @compressed_size: copy from the attribute record
* @compression_block_size: size of a compression block (cb)
* @compression_block_size_bits: log2 of the size of a cb
* @compression_block_clusters: number of clusters per cb
*
* This structure exists purely to provide a mechanism of caching the runlist
* of an attribute. If you want to operate on a particular attribute extent,
* you should not be using this structure at all. If you want to work with a
* resident attribute, you should not be using this structure at all. As a
* fail-safe check make sure to test NAttrNonResident() and if it is false, you
* know you shouldn't be using this structure.
*
* If you want to work on a resident attribute or on a specific attribute
* extent, you should use ntfs_lookup_attr() to retrieve the attribute (extent)
* record, edit that, and then write back the mft record (or set the
* corresponding ntfs inode dirty for delayed write back).
*
* @rl is the decompressed runlist of the attribute described by this
* structure. Obviously this only makes sense if the attribute is not resident,
* i.e. NAttrNonResident() is true. If the runlist hasn't been decompressed yet
* @rl is NULL, so be prepared to cope with @rl == NULL.
*
* @ni is the base ntfs inode of the attribute described by this structure.
*
* @type is the attribute type (see layout.h for the definition of ATTR_TYPES),
* @name and @name_len are the little endian Unicode name and the name length
* in Unicode characters of the attribute, respectively.
*
* @state contains NTFS attribute specific flags describing this attribute
* structure. See ntfs_attr_state_bits above.
*/
struct _ntfs_attr {
runlist_element *rl;
ntfs_inode *ni;
ATTR_TYPES type;
ATTR_FLAGS data_flags;
ntfschar *name;
u32 name_len;
unsigned long state;
s64 allocated_size;
s64 data_size;
s64 initialized_size;
s64 compressed_size;
u32 compression_block_size;
u8 compression_block_size_bits;
u8 compression_block_clusters;
s8 unused_runs; /* pre-reserved entries available */
};
/**
* enum ntfs_attr_state_bits - bits for the state field in the ntfs_attr
* structure
*/
typedef enum {
NA_Initialized, /* 1: structure is initialized. */
NA_NonResident, /* 1: Attribute is not resident. */
NA_BeingNonResident, /* 1: Attribute is being made not resident. */
NA_FullyMapped, /* 1: Attribute has been fully mapped */
NA_ComprClosing, /* 1: Compressed attribute is being closed */
} ntfs_attr_state_bits;
#define test_nattr_flag(na, flag) test_bit(NA_##flag, (na)->state)
#define set_nattr_flag(na, flag) set_bit(NA_##flag, (na)->state)
#define clear_nattr_flag(na, flag) clear_bit(NA_##flag, (na)->state)
#define NAttrInitialized(na) test_nattr_flag(na, Initialized)
#define NAttrSetInitialized(na) set_nattr_flag(na, Initialized)
#define NAttrClearInitialized(na) clear_nattr_flag(na, Initialized)
#define NAttrNonResident(na) test_nattr_flag(na, NonResident)
#define NAttrSetNonResident(na) set_nattr_flag(na, NonResident)
#define NAttrClearNonResident(na) clear_nattr_flag(na, NonResident)
#define NAttrBeingNonResident(na) test_nattr_flag(na, BeingNonResident)
#define NAttrSetBeingNonResident(na) set_nattr_flag(na, BeingNonResident)
#define NAttrClearBeingNonResident(na) clear_nattr_flag(na, BeingNonResident)
#define NAttrFullyMapped(na) test_nattr_flag(na, FullyMapped)
#define NAttrSetFullyMapped(na) set_nattr_flag(na, FullyMapped)
#define NAttrClearFullyMapped(na) clear_nattr_flag(na, FullyMapped)
#define NAttrComprClosing(na) test_nattr_flag(na, ComprClosing)
#define NAttrSetComprClosing(na) set_nattr_flag(na, ComprClosing)
#define NAttrClearComprClosing(na) clear_nattr_flag(na, ComprClosing)
#define GenNAttrIno(func_name, flag) \
extern int NAttr##func_name(ntfs_attr *na); \
extern void NAttrSet##func_name(ntfs_attr *na); \
extern void NAttrClear##func_name(ntfs_attr *na);
GenNAttrIno(Compressed, FILE_ATTR_COMPRESSED)
GenNAttrIno(Encrypted, FILE_ATTR_ENCRYPTED)
GenNAttrIno(Sparse, FILE_ATTR_SPARSE_FILE)
#undef GenNAttrIno
/**
* union attr_val - Union of all known attribute values
*
* For convenience. Used in the attr structure.
*/
typedef union {
u8 _default; /* Unnamed u8 to serve as default when just using
a_val without specifying any of the below. */
STANDARD_INFORMATION std_inf;
ATTR_LIST_ENTRY al_entry;
FILE_NAME_ATTR filename;
OBJECT_ID_ATTR obj_id;
SECURITY_DESCRIPTOR_ATTR sec_desc;
VOLUME_NAME vol_name;
VOLUME_INFORMATION vol_inf;
DATA_ATTR data;
INDEX_ROOT index_root;
INDEX_BLOCK index_blk;
BITMAP_ATTR bmp;
REPARSE_POINT reparse;
EA_INFORMATION ea_inf;
EA_ATTR ea;
PROPERTY_SET property_set;
LOGGED_UTILITY_STREAM logged_util_stream;
EFS_ATTR_HEADER efs;
} attr_val;
extern void ntfs_attr_init(ntfs_attr *na, const BOOL non_resident,
const ATTR_FLAGS data_flags, const BOOL encrypted,
const BOOL sparse,
const s64 allocated_size, const s64 data_size,
const s64 initialized_size, const s64 compressed_size,
const u8 compression_unit);
/* warning : in the following "name" has to be freeable */
/* or one of constants AT_UNNAMED, NTFS_INDEX_I30 or STREAM_SDS */
extern ntfs_attr *ntfs_attr_open(ntfs_inode *ni, const ATTR_TYPES type,
ntfschar *name, u32 name_len);
extern void ntfs_attr_close(ntfs_attr *na);
extern s64 ntfs_attr_pread(ntfs_attr *na, const s64 pos, s64 count,
void *b);
extern s64 ntfs_attr_pwrite(ntfs_attr *na, const s64 pos, s64 count,
const void *b);
extern int ntfs_attr_pclose(ntfs_attr *na);
extern void *ntfs_attr_readall(ntfs_inode *ni, const ATTR_TYPES type,
ntfschar *name, u32 name_len, s64 *data_size);
extern s64 ntfs_attr_mst_pread(ntfs_attr *na, const s64 pos,
const s64 bk_cnt, const u32 bk_size, void *dst);
extern s64 ntfs_attr_mst_pwrite(ntfs_attr *na, const s64 pos,
s64 bk_cnt, const u32 bk_size, void *src);
extern int ntfs_attr_map_runlist(ntfs_attr *na, VCN vcn);
extern int ntfs_attr_map_whole_runlist(ntfs_attr *na);
extern LCN ntfs_attr_vcn_to_lcn(ntfs_attr *na, const VCN vcn);
extern runlist_element *ntfs_attr_find_vcn(ntfs_attr *na, const VCN vcn);
extern int ntfs_attr_size_bounds_check(const ntfs_volume *vol,
const ATTR_TYPES type, const s64 size);
extern int ntfs_attr_can_be_resident(const ntfs_volume *vol,
const ATTR_TYPES type);
int ntfs_attr_make_non_resident(ntfs_attr *na,
ntfs_attr_search_ctx *ctx);
int ntfs_attr_force_non_resident(ntfs_attr *na);
extern int ntfs_make_room_for_attr(MFT_RECORD *m, u8 *pos, u32 size);
extern int ntfs_resident_attr_record_add(ntfs_inode *ni, ATTR_TYPES type,
ntfschar *name, u8 name_len, u8 *val, u32 size,
ATTR_FLAGS flags);
extern int ntfs_non_resident_attr_record_add(ntfs_inode *ni, ATTR_TYPES type,
ntfschar *name, u8 name_len, VCN lowest_vcn, int dataruns_size,
ATTR_FLAGS flags);
extern int ntfs_attr_record_rm(ntfs_attr_search_ctx *ctx);
extern int ntfs_attr_add(ntfs_inode *ni, ATTR_TYPES type,
ntfschar *name, u8 name_len, u8 *val, s64 size);
extern int ntfs_attr_set_flags(ntfs_inode *ni, ATTR_TYPES type,
ntfschar *name, u8 name_len, ATTR_FLAGS flags, ATTR_FLAGS mask);
extern int ntfs_attr_rm(ntfs_attr *na);
extern int ntfs_attr_record_resize(MFT_RECORD *m, ATTR_RECORD *a, u32 new_size);
extern int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,
const u32 new_size);
extern int ntfs_attr_record_move_to(ntfs_attr_search_ctx *ctx, ntfs_inode *ni);
extern int ntfs_attr_record_move_away(ntfs_attr_search_ctx *ctx, int extra);
extern int ntfs_attr_update_mapping_pairs(ntfs_attr *na, VCN from_vcn);
extern int ntfs_attr_truncate(ntfs_attr *na, const s64 newsize);
/**
* get_attribute_value_length - return the length of the value of an attribute
* @a: pointer to a buffer containing the attribute record
*
* Return the byte size of the attribute value of the attribute @a (as it
* would be after eventual decompression and filling in of holes if sparse).
* If we return 0, check errno. If errno is 0 the actual length was 0,
* otherwise errno describes the error.
*
* FIXME: Describe possible errnos.
*/
extern s64 ntfs_get_attribute_value_length(const ATTR_RECORD *a);
/**
* get_attribute_value - return the attribute value of an attribute
* @vol: volume on which the attribute is present
* @a: attribute to get the value of
* @b: destination buffer for the attribute value
*
* Make a copy of the attribute value of the attribute @a into the destination
* buffer @b. Note, that the size of @b has to be at least equal to the value
* returned by get_attribute_value_length(@a).
*
* Return number of bytes copied. If this is zero check errno. If errno is 0
* then nothing was read due to a zero-length attribute value, otherwise
* errno describes the error.
*/
extern s64 ntfs_get_attribute_value(const ntfs_volume *vol,
const ATTR_RECORD *a, u8 *b);
extern void ntfs_attr_name_free(char **name);
extern char *ntfs_attr_name_get(const ntfschar *uname, const int uname_len);
extern int ntfs_attr_exist(ntfs_inode *ni, const ATTR_TYPES type,
ntfschar *name, u32 name_len);
extern int ntfs_attr_remove(ntfs_inode *ni, const ATTR_TYPES type,
ntfschar *name, u32 name_len);
extern s64 ntfs_attr_get_free_bits(ntfs_attr *na);
#endif /* defined _NTFS_ATTRIB_H */
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