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- /*
- * attrib.h - Exports for attribute handling. Part of the Linux-NTFS project.
- *
- * Copyright (c) 2000-2004 Anton Altaparmakov
- * Copyright (c) 2004-2005 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_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"
-
- extern ntfschar AT_UNNAMED[];
-
- /**
- * 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;
-
- /**
- * 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 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);
- }
-
- /**
- * 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;
- 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;
- };
-
- /**
- * 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. */
- } 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 GenNAttrIno(flag) \
- static inline int NAttr##flag(ntfs_attr *na) \
- { \
- if (na->type == AT_DATA && na->name == AT_UNNAMED) \
- return NIno##flag(na->ni); \
- return 0; \
- } \
- static inline void NAttrSet##flag(ntfs_attr *na) \
- { \
- if (na->type == AT_DATA && na->name == AT_UNNAMED) \
- NInoSet##flag(na->ni); \
- else \
- Dprintf("%s(): BUG! Should be called only for " \
- "unnamed data attribute.\n", \
- __FUNCTION__); \
- } \
- static inline void NAttrClear##flag(ntfs_attr *na) \
- { \
- if (na->type == AT_DATA && na->name == AT_UNNAMED) \
- NInoClear##flag(na->ni); \
- }
-
- GenNAttrIno(Compressed)
- GenNAttrIno(Encrypted)
- GenNAttrIno(Sparse)
-
- /*
- * 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 BOOL compressed, 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);
-
- 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 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_non_resident(const ntfs_volume *vol,
- const ATTR_TYPES type);
- extern int ntfs_attr_can_be_resident(const ntfs_volume *vol,
- const ATTR_TYPES type);
-
- 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_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 newsize);
-
- 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);
-
- extern int ntfs_attr_truncate(ntfs_attr *na, const s64 newsize);
-
- // FIXME / TODO: Above here the file is cleaned up. (AIA)
- /**
- * 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.
- */
- 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.
- */
- s64 ntfs_get_attribute_value(const ntfs_volume *vol, const ATTR_RECORD *a,
- u8 *b);
-
- #endif /* defined _NTFS_ATTRIB_H */
-
-