| 1 | /* $Id: kFsCache.h 2853 2016-08-31 20:56:48Z bird $ */
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| 2 | /** @file
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| 3 | * kFsCache.c - NT directory content cache.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2016 knut st. osmundsen <bird-kBuild-spamx@anduin.net>
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| 8 | *
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a
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| 10 | * copy of this software and associated documentation files (the "Software"),
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| 11 | * to deal in the Software without restriction, including without limitation
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the
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| 14 | * Software is furnished to do so, subject to the following conditions:
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| 15 | *
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| 16 | * The above copyright notice and this permission notice shall be included
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| 17 | * in all copies or substantial portions of the Software.
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| 18 | *
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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| 22 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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| 23 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 24 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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| 25 | * IN THE SOFTWARE.
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| 26 | *
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| 27 | * Alternatively, the content of this file may be used under the terms of the
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| 28 | * GPL version 2 or later, or LGPL version 2.1 or later.
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| 29 | */
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| 30 |
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| 31 | #ifndef ___lib_nt_kFsCache_h___
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| 32 | #define ___lib_nt_kFsCache_h___
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| 33 |
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| 34 |
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| 35 | #include <k/kHlp.h>
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| 36 | #include "ntstat.h"
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| 37 | #ifndef NDEBUG
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| 38 | # include <stdarg.h>
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| 39 | #endif
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| 40 |
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| 41 |
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| 42 | /** @def KFSCACHE_CFG_UTF16
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| 43 | * Whether to compile in the UTF-16 names support. */
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| 44 | #define KFSCACHE_CFG_UTF16 1
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| 45 | /** @def KFSCACHE_CFG_SHORT_NAMES
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| 46 | * Whether to compile in the short name support. */
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| 47 | #define KFSCACHE_CFG_SHORT_NAMES 1
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| 48 | /** @def KFSCACHE_CFG_PATH_HASH_TAB_SIZE
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| 49 | * Size of the path hash table. */
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| 50 | #define KFSCACHE_CFG_PATH_HASH_TAB_SIZE 16381
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| 51 | /** The max length paths we consider. */
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| 52 | #define KFSCACHE_CFG_MAX_PATH 1024
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| 53 | /** The max ANSI name length. */
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| 54 | #define KFSCACHE_CFG_MAX_ANSI_NAME (256*3 + 16)
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| 55 | /** The max UTF-16 name length. */
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| 56 | #define KFSCACHE_CFG_MAX_UTF16_NAME (256*2 + 16)
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| 57 |
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| 58 |
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| 59 |
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| 60 | /** Special KFSOBJ::uCacheGen number indicating that it does not apply. */
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| 61 | #define KFSOBJ_CACHE_GEN_IGNORE KU32_MAX
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| 62 |
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| 63 |
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| 64 | /** @name KFSOBJ_TYPE_XXX - KFSOBJ::bObjType
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| 65 | * @{ */
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| 66 | /** Directory, type KFSDIR. */
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| 67 | #define KFSOBJ_TYPE_DIR KU8_C(0x01)
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| 68 | /** Regular file - type KFSOBJ. */
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| 69 | #define KFSOBJ_TYPE_FILE KU8_C(0x02)
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| 70 | /** Other file - type KFSOBJ. */
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| 71 | #define KFSOBJ_TYPE_OTHER KU8_C(0x03)
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| 72 | /** Caching of a negative result - type KFSOBJ.
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| 73 | * @remarks We will allocate enough space for the largest cache node, so this
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| 74 | * can metamorph into any other object should it actually turn up. */
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| 75 | #define KFSOBJ_TYPE_MISSING KU8_C(0x04)
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| 76 | ///** Invalidated entry flag. */
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| 77 | //#define KFSOBJ_TYPE_F_INVALID KU8_C(0x20)
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| 78 | /** @} */
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| 79 |
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| 80 | /** @name KFSOBJ_F_XXX - KFSOBJ::fFlags
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| 81 | * @{ */
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| 82 | /** Whether the file system update the modified timestamp of directories
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| 83 | * when something is removed from it or added to it.
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| 84 | * @remarks They say NTFS is the only windows filesystem doing this. */
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| 85 | #define KFSOBJ_F_WORKING_DIR_MTIME KU32_C(0x00000001)
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| 86 | /** NTFS file system volume. */
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| 87 | #define KFSOBJ_F_NTFS KU32_C(0x80000000)
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| 88 | /** @} */
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| 89 |
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| 90 |
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| 91 | #define IS_ALPHA(ch) ( ((ch) >= 'A' && (ch) <= 'Z') || ((ch) >= 'a' && (ch) <= 'z') )
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| 92 | #define IS_SLASH(ch) ((ch) == '\\' || (ch) == '/')
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| 93 |
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| 94 |
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| 95 |
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| 96 |
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| 97 | /** Pointer to a core object. */
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| 98 | typedef struct KFSOBJ *PKFSOBJ;
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| 99 | /** Pointer to a directory object. */
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| 100 | typedef struct KFSDIR *PKFSDIR;
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| 101 | /** Pointer to a directory hash table entry. */
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| 102 | typedef struct KFSOBJHASH *PKFSOBJHASH;
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| 103 |
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| 104 |
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| 105 | /**
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| 106 | * Directory hash table entry.
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| 107 | *
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| 108 | * There can be two of these per directory entry when the short name differs
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| 109 | * from the long name.
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| 110 | */
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| 111 | typedef struct KFSOBJHASH
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| 112 | {
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| 113 | /** Pointer to the next entry with the same hash. */
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| 114 | PKFSOBJHASH pNext;
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| 115 | /** Pointer to the object. */
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| 116 | PKFSOBJ pObj;
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| 117 | } KFSOBJHASH;
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| 118 |
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| 119 |
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| 120 | /**
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| 121 | * Base cache node.
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| 122 | */
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| 123 | typedef struct KFSOBJ
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| 124 | {
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| 125 | /** Magic value (KFSOBJ_MAGIC). */
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| 126 | KU32 u32Magic;
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| 127 | /** Number of references. */
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| 128 | KU32 volatile cRefs;
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| 129 | /** The cache generation, see KFSOBJ_CACHE_GEN_IGNORE. */
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| 130 | KU32 uCacheGen;
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| 131 | /** The object type, KFSOBJ_TYPE_XXX. */
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| 132 | KU8 bObjType;
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| 133 | /** Set if the Stats member is valid, clear if not. */
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| 134 | KBOOL fHaveStats;
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| 135 | /** Unused flags. */
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| 136 | KBOOL abUnused[2];
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| 137 | /** Flags, KFSOBJ_F_XXX. */
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| 138 | KU32 fFlags;
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| 139 |
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| 140 | /** Pointer to the parent (directory).
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| 141 | * This is only NULL for a root. */
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| 142 | PKFSDIR pParent;
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| 143 |
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| 144 | /** The directory name. (Allocated after the structure.) */
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| 145 | const char *pszName;
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| 146 | /** The length of pszName. */
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| 147 | KU16 cchName;
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| 148 | /** The length of the parent path (up to where pszName starts).
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| 149 | * @note This is valuable when constructing an absolute path to this node by
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| 150 | * means of the parent pointer (no need for recursion). */
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| 151 | KU16 cchParent;
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| 152 | #ifdef KFSCACHE_CFG_UTF16
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| 153 | /** The length of pwszName (in wchar_t's). */
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| 154 | KU16 cwcName;
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| 155 | /** The length of the parent UTF-16 path (in wchar_t's).
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| 156 | * @note This is valuable when constructing an absolute path to this node by
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| 157 | * means of the parent pointer (no need for recursion). */
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| 158 | KU16 cwcParent;
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| 159 | /** The UTF-16 object name. (Allocated after the structure.) */
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| 160 | const wchar_t *pwszName;
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| 161 | #endif
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| 162 |
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| 163 | #ifdef KFSCACHE_CFG_SHORT_NAMES
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| 164 | /** The short object name. (Allocated after the structure, could be same
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| 165 | * as pszName.) */
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| 166 | const char *pszShortName;
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| 167 | /** The length of pszShortName. */
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| 168 | KU16 cchShortName;
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| 169 | /** The length of the short parent path (up to where pszShortName starts). */
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| 170 | KU16 cchShortParent;
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| 171 | # ifdef KFSCACHE_CFG_UTF16
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| 172 | /** The length of pwszShortName (in wchar_t's). */
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| 173 | KU16 cwcShortName;
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| 174 | /** The length of the short parent UTF-16 path (in wchar_t's). */
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| 175 | KU16 cwcShortParent;
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| 176 | /** The UTF-16 short object name. (Allocated after the structure, possibly
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| 177 | * same as pwszName.) */
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| 178 | const wchar_t *pwszShortName;
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| 179 | # endif
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| 180 | #endif
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| 181 |
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| 182 | /** Stats - only valid when fHaveStats is set. */
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| 183 | BirdStat_T Stats;
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| 184 | } KFSOBJ;
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| 185 |
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| 186 | /** The magic for a KFSOBJ structure (Thelonious Sphere Monk). */
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| 187 | #define KFSOBJ_MAGIC KU32_C(0x19171010)
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| 188 |
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| 189 |
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| 190 | /**
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| 191 | * Directory node in the cache.
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| 192 | */
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| 193 | typedef struct KFSDIR
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| 194 | {
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| 195 | /** The core object information. */
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| 196 | KFSOBJ Obj;
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| 197 |
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| 198 | /** Child objects. */
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| 199 | PKFSOBJ *papChildren;
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| 200 | /** The number of child objects. */
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| 201 | KU32 cChildren;
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| 202 |
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| 203 | /** The size of the hash table.
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| 204 | * @remarks The hash table is optional and only used when there are a lot of
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| 205 | * entries in the directory. */
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| 206 | KU32 cHashTab;
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| 207 | /** Pointer to the hash table.
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| 208 | * @todo this isn't quite there yet, structure wise. sigh. */
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| 209 | PKFSOBJHASH paHashTab;
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| 210 |
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| 211 | /** Handle to the directory (we generally keep it open). */
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| 212 | HANDLE hDir;
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| 213 | /** The device number we queried/inherited when opening it. */
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| 214 | KU64 uDevNo;
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| 215 |
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| 216 | /** Set if populated. */
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| 217 | KBOOL fPopulated;
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| 218 | } KFSDIR;
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| 219 |
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| 220 |
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| 221 | /**
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| 222 | * Lookup errors.
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| 223 | */
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| 224 | typedef enum KFSLOOKUPERROR
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| 225 | {
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| 226 | /** Lookup was a success. */
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| 227 | KFSLOOKUPERROR_SUCCESS = 0,
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| 228 | /** A path component was not found. */
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| 229 | KFSLOOKUPERROR_PATH_COMP_NOT_FOUND,
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| 230 | /** A path component is not a directory. */
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| 231 | KFSLOOKUPERROR_PATH_COMP_NOT_DIR,
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| 232 | /** The final path entry is not a directory (trailing slash). */
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| 233 | KFSLOOKUPERROR_NOT_DIR,
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| 234 | /** Not found. */
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| 235 | KFSLOOKUPERROR_NOT_FOUND,
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| 236 | /** The path is too long. */
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| 237 | KFSLOOKUPERROR_PATH_TOO_LONG,
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| 238 | /** Unsupported path type. */
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| 239 | KFSLOOKUPERROR_UNSUPPORTED,
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| 240 | /** We're out of memory. */
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| 241 | KFSLOOKUPERROR_OUT_OF_MEMORY,
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| 242 |
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| 243 | /** Error opening directory. */
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| 244 | KFSLOOKUPERROR_DIR_OPEN_ERROR,
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| 245 | /** Error reading directory. */
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| 246 | KFSLOOKUPERROR_DIR_READ_ERROR,
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| 247 | /** UTF-16 to ANSI conversion error. */
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| 248 | KFSLOOKUPERROR_ANSI_CONVERSION_ERROR,
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| 249 | /** ANSI to UTF-16 conversion error. */
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| 250 | KFSLOOKUPERROR_UTF16_CONVERSION_ERROR,
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| 251 | /** Internal error. */
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| 252 | KFSLOOKUPERROR_INTERNAL_ERROR
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| 253 | } KFSLOOKUPERROR;
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| 254 |
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| 255 |
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| 256 | /** Pointer to an ANSI path hash table entry. */
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| 257 | typedef struct KFSHASHA *PKFSHASHA;
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| 258 | /**
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| 259 | * ANSI file system path hash table entry.
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| 260 | * The path hash table allows us to skip parsing and walking a path.
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| 261 | */
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| 262 | typedef struct KFSHASHA
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| 263 | {
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| 264 | /** Next entry with the same hash table slot. */
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| 265 | PKFSHASHA pNext;
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| 266 | /** Path hash value. */
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| 267 | KU32 uHashPath;
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| 268 | /** The path length. */
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| 269 | KU32 cchPath;
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| 270 | /** The cache generation ID. */
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| 271 | KU32 uCacheGen;
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| 272 | /** The lookup error (when pFsObj is NULL). */
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| 273 | KFSLOOKUPERROR enmError;
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| 274 | /** The path. (Allocated after the structure.) */
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| 275 | const char *pszPath;
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| 276 | /** Pointer to the matching FS object.
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| 277 | * This is NULL for negative path entries? */
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| 278 | PKFSOBJ pFsObj;
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| 279 | } KFSHASHA;
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| 280 |
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| 281 |
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| 282 | #ifdef KFSCACHE_CFG_UTF16
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| 283 | /** Pointer to an UTF-16 path hash table entry. */
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| 284 | typedef struct KFSHASHW *PKFSHASHW;
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| 285 | /**
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| 286 | * UTF-16 file system path hash table entry. The path hash table allows us
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| 287 | * to skip parsing and walking a path.
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| 288 | */
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| 289 | typedef struct KFSHASHW
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| 290 | {
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| 291 | /** Next entry with the same hash table slot. */
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| 292 | PKFSHASHW pNext;
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| 293 | /** Path hash value. */
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| 294 | KU32 uHashPath;
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| 295 | /** The path length (in wchar_t units). */
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| 296 | KU32 cwcPath;
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| 297 | /** The cache generation ID. */
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| 298 | KU32 uCacheGen;
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| 299 | /** The lookup error (when pFsObj is NULL). */
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| 300 | KFSLOOKUPERROR enmError;
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| 301 | /** The path. (Allocated after the structure.) */
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| 302 | const wchar_t *pwszPath;
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| 303 | /** Pointer to the matching FS object.
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| 304 | * This is NULL for negative path entries? */
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| 305 | PKFSOBJ pFsObj;
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| 306 | } KFSHASHW;
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| 307 | #endif
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| 308 |
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| 309 |
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| 310 | /** @name KFSCACHE_F_XXX
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| 311 | * @{ */
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| 312 | /** Whether to cache missing directory entries (KFSOBJ_TYPE_MISSING). */
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| 313 | #define KFSCACHE_F_MISSING_OBJECTS KU32_C(0x00000001)
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| 314 | /** Whether to cache missing paths. */
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| 315 | #define KFSCACHE_F_MISSING_PATHS KU32_C(0x00000002)
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| 316 | /** @} */
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| 317 |
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| 318 |
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| 319 | /** Pointer to a cache. */
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| 320 | typedef struct KFSCACHE *PKFSCACHE;
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| 321 | /**
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| 322 | * Directory cache instance.
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| 323 | */
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| 324 | typedef struct KFSCACHE
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| 325 | {
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| 326 | /** Magic value (KFSCACHE_MAGIC). */
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| 327 | KU32 u32Magic;
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| 328 | /** Cache flags. */
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| 329 | KU32 fFlags;
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| 330 |
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| 331 | /** The current cache generation for objects that already exists. */
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| 332 | KU32 uGeneration;
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| 333 | /** The current cache generation for missing objects, negative results, ++. */
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| 334 | KU32 uGenerationMissing;
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| 335 |
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| 336 | /** Number of cache objects. */
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| 337 | KSIZE cObjects;
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| 338 | /** Memory occupied by the cache object structures. */
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| 339 | KSIZE cbObjects;
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| 340 | /** Number of lookups. */
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| 341 | KSIZE cLookups;
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| 342 | /** Number of hits in the path hash tables. */
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| 343 | KSIZE cPathHashHits;
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| 344 | /** Number of hits walking the file system hierarchy. */
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| 345 | KSIZE cWalkHits;
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| 346 |
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| 347 | /** The root directory. */
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| 348 | KFSDIR RootDir;
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| 349 |
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| 350 | /** File system hash table for ANSI filename strings. */
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| 351 | PKFSHASHA apAnsiPaths[KFSCACHE_CFG_PATH_HASH_TAB_SIZE];
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| 352 | /** Number of paths in the apAnsiPaths hash table. */
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| 353 | KSIZE cAnsiPaths;
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| 354 | /** Number of collisions in the apAnsiPaths hash table. */
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| 355 | KSIZE cAnsiPathCollisions;
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| 356 | /** Amount of memory used by the path entries. */
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| 357 | KSIZE cbAnsiPaths;
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| 358 |
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| 359 | #ifdef KFSCACHE_CFG_UTF16
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| 360 | /** Number of paths in the apUtf16Paths hash table. */
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| 361 | KSIZE cUtf16Paths;
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| 362 | /** Number of collisions in the apUtf16Paths hash table. */
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| 363 | KSIZE cUtf16PathCollisions;
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| 364 | /** Amount of memory used by the UTF-16 path entries. */
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| 365 | KSIZE cbUtf16Paths;
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| 366 | /** File system hash table for UTF-16 filename strings. */
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| 367 | PKFSHASHW apUtf16Paths[KFSCACHE_CFG_PATH_HASH_TAB_SIZE];
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| 368 | #endif
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| 369 | } KFSCACHE;
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| 370 |
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| 371 | /** Magic value for KFSCACHE::u32Magic (Jon Batiste). */
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| 372 | #define KFSCACHE_MAGIC KU32_C(0x19861111)
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| 373 |
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| 374 |
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| 375 | /** @def KW_LOG
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| 376 | * Generic logging.
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| 377 | * @param a Argument list for kFsCacheDbgPrintf */
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| 378 | #ifdef NDEBUG
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| 379 | # define KFSCACHE_LOG(a) do { } while (0)
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| 380 | #else
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| 381 | # define KFSCACHE_LOG(a) kFsCacheDbgPrintf a
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| 382 | void kFsCacheDbgPrintfV(const char *pszFormat, va_list va);
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| 383 | void kFsCacheDbgPrintf(const char *pszFormat, ...);
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| 384 | #endif
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| 385 |
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| 386 |
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| 387 | KBOOL kFsCacheDirAddChild(PKFSCACHE pCache, PKFSDIR pParent, PKFSOBJ pChild, KFSLOOKUPERROR *penmError);
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| 388 | PKFSOBJ kFsCacheCreateObject(PKFSCACHE pCache, PKFSDIR pParent,
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| 389 | char const *pszName, KU16 cchName, wchar_t const *pwszName, KU16 cwcName,
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| 390 | #ifdef KFSCACHE_CFG_SHORT_NAMES
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| 391 | char const *pszShortName, KU16 cchShortName, wchar_t const *pwszShortName, KU16 cwcShortName,
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| 392 | #endif
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| 393 | KU8 bObjType, KFSLOOKUPERROR *penmError);
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| 394 | PKFSOBJ kFsCacheCreateObjectW(PKFSCACHE pCache, PKFSDIR pParent, wchar_t const *pwszName, KU32 cwcName,
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| 395 | #ifdef KFSCACHE_CFG_SHORT_NAMES
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| 396 | wchar_t const *pwszShortName, KU32 cwcShortName,
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| 397 | #endif
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| 398 | KU8 bObjType, KFSLOOKUPERROR *penmError);
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| 399 | PKFSOBJ kFsCacheLookupA(PKFSCACHE pCache, const char *pszPath, KFSLOOKUPERROR *penmError);
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| 400 | PKFSOBJ kFsCacheLookupW(PKFSCACHE pCache, const wchar_t *pwszPath, KFSLOOKUPERROR *penmError);
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| 401 |
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| 402 | KU32 kFsCacheObjRelease(PKFSCACHE pCache, PKFSOBJ pObj);
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| 403 | KU32 kFsCacheObjRetain(PKFSOBJ pObj);
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| 404 |
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| 405 | PKFSCACHE kFsCacheCreate(KU32 fFlags);
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| 406 | void kFsCacheDestroy(PKFSCACHE);
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| 407 |
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| 408 | #endif
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