| Directory: | cvmfs/ |
|---|---|
| File: | cvmfs/directory_entry.h |
| Date: | 2025-06-22 02:36:02 |
| Exec | Total | Coverage | |
|---|---|---|---|
| Lines: | 124 | 135 | 91.9% |
| Branches: | 22 | 38 | 57.9% |
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /** | ||
| 2 | * This file is part of the CernVM File System. | ||
| 3 | * | ||
| 4 | * Data wrappers for single dentries. In addition to the normal file meta data | ||
| 5 | * it manages bookkeeping data specific to cvmfs such as the associated catalog. | ||
| 6 | */ | ||
| 7 | |||
| 8 | #ifndef CVMFS_DIRECTORY_ENTRY_H_ | ||
| 9 | #define CVMFS_DIRECTORY_ENTRY_H_ | ||
| 10 | |||
| 11 | #include <sys/types.h> | ||
| 12 | |||
| 13 | #include <cassert> | ||
| 14 | #include <cstring> | ||
| 15 | #include <string> | ||
| 16 | #include <vector> | ||
| 17 | |||
| 18 | #include "bigvector.h" | ||
| 19 | #include "compression/compression.h" | ||
| 20 | #include "crypto/hash.h" | ||
| 21 | #include "shortstring.h" | ||
| 22 | #include "util/platform.h" | ||
| 23 | |||
| 24 | namespace publish { | ||
| 25 | class SyncItem; | ||
| 26 | class SyncItemNative; | ||
| 27 | class SyncItemTar; | ||
| 28 | class SyncItemDummyDir; | ||
| 29 | class SyncItemDummyCatalog; | ||
| 30 | } // namespace publish | ||
| 31 | namespace swissknife { | ||
| 32 | class CommandMigrate; | ||
| 33 | class IngestSQL; | ||
| 34 | } | ||
| 35 | |||
| 36 | namespace catalog { | ||
| 37 | |||
| 38 | // Create DirectoryEntries for unit test purposes. | ||
| 39 | class DirectoryEntryTestFactory; | ||
| 40 | |||
| 41 | class MockCatalogManager; | ||
| 42 | class Catalog; | ||
| 43 | class WritableCatalogManager; | ||
| 44 | |||
| 45 | template<class CatalogMgrT> | ||
| 46 | class CatalogBalancer; | ||
| 47 | typedef uint64_t inode_t; | ||
| 48 | |||
| 49 | enum SpecialDirents { | ||
| 50 | kDirentNormal = 0, | ||
| 51 | kDirentNegative, | ||
| 52 | }; | ||
| 53 | |||
| 54 | /** | ||
| 55 | * Wrapper around struct dirent. Only contains file system related meta data | ||
| 56 | * for a directory entry. | ||
| 57 | * TODO(jblomer): separation to DirectoryEntry not quite clear: this one also | ||
| 58 | * contains hash, compression algorithm and external flag | ||
| 59 | */ | ||
| 60 | class DirectoryEntryBase { | ||
| 61 | // For testing the catalog balancing | ||
| 62 | friend class CatalogBalancer<MockCatalogManager>; | ||
| 63 | // Create .cvmfscatalog and .cvmfsautocatalog files | ||
| 64 | friend class CatalogBalancer<WritableCatalogManager>; | ||
| 65 | // Simplify creation of DirectoryEntry objects for write back | ||
| 66 | friend class publish::SyncItem; | ||
| 67 | friend class publish::SyncItemNative; | ||
| 68 | friend class publish::SyncItemTar; | ||
| 69 | friend class publish::SyncItemDummyDir; | ||
| 70 | friend class publish::SyncItemDummyCatalog; | ||
| 71 | friend class swissknife::IngestSQL; //TODO(vvolkl): can probably avoided with new setters | ||
| 72 | // Simplify file system like _touch_ of DirectoryEntry objects | ||
| 73 | friend class SqlDirentTouch; | ||
| 74 | // Allow creation of virtual directories and files | ||
| 75 | friend class VirtualCatalog; | ||
| 76 | |||
| 77 | public: | ||
| 78 | static const inode_t kInvalidInode = 0; | ||
| 79 | |||
| 80 | /** | ||
| 81 | * Used in the swissknife for sanity checks and catalog migration. If | ||
| 82 | * anything is added, also adjust PrintDifferences in swissknife::CommandDiff | ||
| 83 | * and CommandCheck::CompareEntries | ||
| 84 | */ | ||
| 85 | struct Difference { | ||
| 86 | static const unsigned int kIdentical = 0x00000; | ||
| 87 | static const unsigned int kName = 0x00001; | ||
| 88 | static const unsigned int kLinkcount = 0x00002; | ||
| 89 | static const unsigned int kSize = 0x00004; | ||
| 90 | static const unsigned int kMode = 0x00008; | ||
| 91 | static const unsigned int kMtime = 0x00010; | ||
| 92 | static const unsigned int kSymlink = 0x00020; | ||
| 93 | static const unsigned int kChecksum = 0x00040; | ||
| 94 | static const unsigned int kHardlinkGroup = 0x00080; | ||
| 95 | static const unsigned int kNestedCatalogTransitionFlags = 0x00100; | ||
| 96 | static const unsigned int kChunkedFileFlag = 0x00200; | ||
| 97 | static const unsigned int kHasXattrsFlag = 0x00400; | ||
| 98 | static const unsigned int kExternalFileFlag = 0x00800; | ||
| 99 | static const unsigned int kBindMountpointFlag = 0x01000; | ||
| 100 | static const unsigned int kHiddenFlag = 0x02000; | ||
| 101 | static const unsigned int kDirectIoFlag = 0x04000; | ||
| 102 | static const unsigned int kUid = 0x08000; | ||
| 103 | static const unsigned int kGid = 0x10000; | ||
| 104 | }; | ||
| 105 | typedef unsigned int Differences; | ||
| 106 | |||
| 107 | /** | ||
| 108 | * Zero-constructed DirectoryEntry objects are unusable as such. | ||
| 109 | */ | ||
| 110 | 59096939 | inline DirectoryEntryBase() | |
| 111 | 59096939 | : inode_(kInvalidInode) | |
| 112 | 59096939 | , mode_(0) | |
| 113 | 59096939 | , uid_(0) | |
| 114 | 59096939 | , gid_(0) | |
| 115 | 59096939 | , size_(0) | |
| 116 | 59096939 | , mtime_(0) | |
| 117 | 59096939 | , mtime_ns_(-1) | |
| 118 | 59096939 | , linkcount_(1) // generally a normal file has linkcount 1 -> default | |
| 119 | 59096939 | , has_xattrs_(false) | |
| 120 | 59096939 | , is_external_file_(false) | |
| 121 | 59096939 | , is_direct_io_(false) | |
| 122 |
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59096939 | , compression_algorithm_(zlib::kZlibDefault) { } |
| 123 | |||
| 124 | 41941 | inline bool IsRegular() const { return S_ISREG(mode_); } | |
| 125 | 46952 | inline bool IsLink() const { return S_ISLNK(mode_); } | |
| 126 | 44820 | inline bool IsDirectory() const { return S_ISDIR(mode_); } | |
| 127 | 15953 | inline bool IsFifo() const { return S_ISFIFO(mode_); } | |
| 128 | 15757 | inline bool IsSocket() const { return S_ISSOCK(mode_); } | |
| 129 | 41784 | inline bool IsCharDev() const { return S_ISCHR(mode_); } | |
| 130 | 41784 | inline bool IsBlockDev() const { return S_ISBLK(mode_); } | |
| 131 | 15953 | inline bool IsSpecial() const { | |
| 132 |
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15953 | return IsFifo() || IsSocket() || IsCharDev() || IsBlockDev(); |
| 133 | } | ||
| 134 | 24691 | inline bool IsExternalFile() const { return is_external_file_; } | |
| 135 | 11522 | inline bool IsDirectIo() const { return is_direct_io_; } | |
| 136 | 29520 | inline bool HasXattrs() const { return has_xattrs_; } | |
| 137 | 24744 | inline bool HasMtimeNs() const { return mtime_ns_ >= 0; } | |
| 138 | |||
| 139 | 17473 | inline inode_t inode() const { return inode_; } | |
| 140 | 10981 | inline uint32_t linkcount() const { return linkcount_; } | |
| 141 | 60567 | inline NameString name() const { return name_; } | |
| 142 | 2666 | inline LinkString symlink() const { return symlink_; } | |
| 143 | 2252 | inline time_t mtime() const { return mtime_; } | |
| 144 | 2156 | inline int32_t mtime_ns() const { return mtime_ns_; } | |
| 145 | 2252 | inline unsigned int mode() const { return mode_; } | |
| 146 | 3709 | inline uid_t uid() const { return uid_; } | |
| 147 | 3709 | inline gid_t gid() const { return gid_; } | |
| 148 | 7835 | inline shash::Any checksum() const { return checksum_; } | |
| 149 | 31955 | inline const shash::Any *checksum_ptr() const { return &checksum_; } | |
| 150 | ✗ | inline shash::Algorithms hash_algorithm() const { | |
| 151 | ✗ | return checksum_.algorithm; | |
| 152 | } | ||
| 153 | 24803 | inline uint64_t size() const { | |
| 154 |
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24803 | if (IsLink()) |
| 155 | 306 | return symlink().GetLength(); | |
| 156 |
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24497 | if (IsBlockDev() || IsCharDev()) |
| 157 | ✗ | return 0; | |
| 158 | 24497 | return size_; | |
| 159 | } | ||
| 160 | 1530 | inline dev_t rdev() const { | |
| 161 |
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1530 | if (IsBlockDev() || IsCharDev()) |
| 162 | ✗ | return size_; | |
| 163 | 1530 | return 1; | |
| 164 | } | ||
| 165 | 20194 | inline std::string GetFullPath(const std::string &parent_directory) const { | |
| 166 | 20194 | std::string file_path = parent_directory + "/"; | |
| 167 |
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20194 | file_path.append(name().GetChars(), name().GetLength()); |
| 168 | 20194 | return file_path; | |
| 169 | } | ||
| 170 | |||
| 171 | 1257 | inline void set_inode(const inode_t inode) { inode_ = inode; } | |
| 172 | 8682 | inline void set_linkcount(const uint32_t linkcount) { | |
| 173 |
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8682 | assert(linkcount > 0); |
| 174 | 8682 | linkcount_ = linkcount; | |
| 175 | 8682 | } | |
| 176 | ✗ | inline void set_symlink(const LinkString &symlink) { symlink_ = symlink; } | |
| 177 | 14127 | inline void set_has_xattrs(const bool has_xattrs) { | |
| 178 | 14127 | has_xattrs_ = has_xattrs; | |
| 179 | 14127 | } | |
| 180 | |||
| 181 | 9366 | inline zlib::Algorithms compression_algorithm() const { | |
| 182 | 9366 | return compression_algorithm_; | |
| 183 | } | ||
| 184 | |||
| 185 | /** | ||
| 186 | * Converts to a stat struct as required by many Fuse callbacks. | ||
| 187 | * @return the struct stat for this DirectoryEntry | ||
| 188 | */ | ||
| 189 | 1434 | inline struct stat GetStatStructure() const { | |
| 190 | struct stat s; | ||
| 191 | 1434 | memset(&s, 0, sizeof(s)); | |
| 192 | 1434 | s.st_dev = 1; | |
| 193 | 1434 | s.st_ino = inode_; | |
| 194 | 1434 | s.st_mode = mode_; | |
| 195 | 1434 | s.st_nlink = linkcount(); | |
| 196 | 1434 | s.st_uid = uid(); | |
| 197 | 1434 | s.st_gid = gid(); | |
| 198 | 1434 | s.st_rdev = rdev(); | |
| 199 | 1434 | s.st_size = static_cast<off_t>(size()); | |
| 200 | 1434 | s.st_blksize = 4096; // will be ignored by Fuse | |
| 201 | 1434 | s.st_blocks = static_cast<blkcnt_t>(1 + size() / 512); | |
| 202 | 1434 | s.st_atime = mtime_; | |
| 203 | 1434 | s.st_mtime = mtime_; | |
| 204 | 1434 | s.st_ctime = mtime_; | |
| 205 |
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1434 | if (HasMtimeNs()) { |
| 206 | #ifdef __APPLE__ | ||
| 207 | s.st_atimespec.tv_nsec = mtime_ns_; | ||
| 208 | s.st_mtimespec.tv_nsec = mtime_ns_; | ||
| 209 | s.st_ctimespec.tv_nsec = mtime_ns_; | ||
| 210 | #else | ||
| 211 | ✗ | s.st_atim.tv_nsec = mtime_ns_; | |
| 212 | ✗ | s.st_mtim.tv_nsec = mtime_ns_; | |
| 213 | ✗ | s.st_ctim.tv_nsec = mtime_ns_; | |
| 214 | #endif | ||
| 215 | } | ||
| 216 | 1434 | return s; | |
| 217 | } | ||
| 218 | |||
| 219 | Differences CompareTo(const DirectoryEntryBase &other) const; | ||
| 220 | inline bool operator==(const DirectoryEntryBase &other) const { | ||
| 221 | return CompareTo(other) == Difference::kIdentical; | ||
| 222 | } | ||
| 223 | inline bool operator!=(const DirectoryEntryBase &other) const { | ||
| 224 | return !(*this == other); | ||
| 225 | } | ||
| 226 | |||
| 227 | protected: | ||
| 228 | // Inodes are generated based on the rowid of the entry in the file catalog. | ||
| 229 | inode_t inode_; | ||
| 230 | |||
| 231 | // Data from struct stat | ||
| 232 | NameString name_; | ||
| 233 | unsigned int mode_; | ||
| 234 | uid_t uid_; | ||
| 235 | gid_t gid_; | ||
| 236 | uint64_t size_; | ||
| 237 | time_t mtime_; | ||
| 238 | // nanosecond part of the mtime. Only valid if non-negative | ||
| 239 | int32_t mtime_ns_; | ||
| 240 | LinkString symlink_; | ||
| 241 | uint32_t linkcount_; | ||
| 242 | // In order to save memory, we only indicate if a directory entry has custom | ||
| 243 | // extended attributes. Another call to the file catalog is necessary to | ||
| 244 | // get them. | ||
| 245 | bool has_xattrs_; | ||
| 246 | |||
| 247 | // The cryptographic hash is not part of the file system intrinsics, though | ||
| 248 | // it can be computed just using the file contents. We therefore put it in | ||
| 249 | // this base class. | ||
| 250 | shash::Any checksum_; | ||
| 251 | |||
| 252 | bool is_external_file_; | ||
| 253 | bool is_direct_io_; | ||
| 254 | |||
| 255 | // The compression algorithm | ||
| 256 | zlib::Algorithms compression_algorithm_; | ||
| 257 | }; | ||
| 258 | |||
| 259 | |||
| 260 | /** | ||
| 261 | * In addition to the file system meta-data covered by DirectoryEntryBase, | ||
| 262 | * DirectoryEntries contain cvmfs-specific meta data. Currently these are the | ||
| 263 | * following things: | ||
| 264 | * - Pointer to the originating catalog | ||
| 265 | * - Markers for nested catalog transition points (mountpoint and root entry) | ||
| 266 | * - Transient marker storing the time of caching (Fuse page caches). | ||
| 267 | * This is required to invalidate caches after a catalog update | ||
| 268 | * - Hardlink group used to emulate hardlinks in cvmfs | ||
| 269 | */ | ||
| 270 | class DirectoryEntry : public DirectoryEntryBase { | ||
| 271 | // Simplify creation of DirectoryEntry objects | ||
| 272 | friend class SqlLookup; | ||
| 273 | // Simplify write of DirectoryEntry objects in database | ||
| 274 | friend class SqlDirentWrite; | ||
| 275 | // For fixing DirectoryEntry glitches | ||
| 276 | friend class swissknife::CommandMigrate; | ||
| 277 | // TODO(rmeusel): remove this dependency | ||
| 278 | friend class WritableCatalogManager; | ||
| 279 | // Create DirectoryEntries for unit test purposes. | ||
| 280 | friend class DirectoryEntryTestFactory; | ||
| 281 | |||
| 282 | public: | ||
| 283 | /** | ||
| 284 | * This is _kind of_ a copy constructor allowing us to create | ||
| 285 | * DirectoryEntries directly from DirectoryEntryBase objects. We make it | ||
| 286 | * explicit, to disallow black magic from happening. It uses the copy | ||
| 287 | * constructor of DirectoryEntryBase and initializes the additional fields of | ||
| 288 | * DirectoryEntry. | ||
| 289 | */ | ||
| 290 | 9547 | inline explicit DirectoryEntry(const DirectoryEntryBase &base) | |
| 291 | 9547 | : DirectoryEntryBase(base) | |
| 292 | 9547 | , hardlink_group_(0) | |
| 293 | 9547 | , is_nested_catalog_root_(false) | |
| 294 | 9547 | , is_nested_catalog_mountpoint_(false) | |
| 295 | 9547 | , is_bind_mountpoint_(false) | |
| 296 | 9547 | , is_chunked_file_(false) | |
| 297 | 9547 | , is_hidden_(false) | |
| 298 | 9547 | , is_negative_(false) { } | |
| 299 | |||
| 300 | 59094204 | inline DirectoryEntry() | |
| 301 | 118188408 | : hardlink_group_(0) | |
| 302 | 59094204 | , is_nested_catalog_root_(false) | |
| 303 | 59094204 | , is_nested_catalog_mountpoint_(false) | |
| 304 | 59094204 | , is_bind_mountpoint_(false) | |
| 305 | 59094204 | , is_chunked_file_(false) | |
| 306 | 59094204 | , is_hidden_(false) | |
| 307 | 59094204 | , is_negative_(false) { } | |
| 308 | |||
| 309 | 2717 | inline explicit DirectoryEntry(SpecialDirents special_type) | |
| 310 | 5434 | : hardlink_group_(0) | |
| 311 | 2717 | , is_nested_catalog_root_(false) | |
| 312 | 2717 | , is_nested_catalog_mountpoint_(false) | |
| 313 | 2717 | , is_bind_mountpoint_(false) | |
| 314 | 2717 | , is_chunked_file_(false) | |
| 315 | 2717 | , is_hidden_(false) | |
| 316 | 2717 | , is_negative_(true) { | |
| 317 |
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2717 | assert(special_type == kDirentNegative); |
| 318 | 2717 | } | |
| 319 | |||
| 320 | 675 | inline SpecialDirents GetSpecial() const { | |
| 321 |
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675 | return is_negative_ ? kDirentNegative : kDirentNormal; |
| 322 | } | ||
| 323 | |||
| 324 | Differences CompareTo(const DirectoryEntry &other) const; | ||
| 325 | inline bool operator==(const DirectoryEntry &other) const { | ||
| 326 | return CompareTo(other) == Difference::kIdentical; | ||
| 327 | } | ||
| 328 | inline bool operator!=(const DirectoryEntry &other) const { | ||
| 329 | return !(*this == other); | ||
| 330 | } | ||
| 331 | |||
| 332 | 2713 | inline bool IsNegative() const { return is_negative_; } | |
| 333 | 36057 | inline bool IsNestedCatalogRoot() const { return is_nested_catalog_root_; } | |
| 334 | 31772 | inline bool IsNestedCatalogMountpoint() const { | |
| 335 | 31772 | return is_nested_catalog_mountpoint_; | |
| 336 | } | ||
| 337 | 23299 | inline bool IsBindMountpoint() const { return is_bind_mountpoint_; } | |
| 338 | 52145 | inline bool IsChunkedFile() const { return is_chunked_file_; } | |
| 339 | 28361 | inline bool IsHidden() const { return is_hidden_; } | |
| 340 | 2156 | inline uint32_t hardlink_group() const { return hardlink_group_; } | |
| 341 | |||
| 342 | 140 | inline void set_hardlink_group(const uint32_t group) { | |
| 343 | 140 | hardlink_group_ = group; | |
| 344 | 140 | } | |
| 345 | 1331 | inline void set_is_nested_catalog_mountpoint(const bool val) { | |
| 346 | 1331 | is_nested_catalog_mountpoint_ = val; | |
| 347 | 1331 | } | |
| 348 | 1252 | inline void set_is_nested_catalog_root(const bool val) { | |
| 349 | 1252 | is_nested_catalog_root_ = val; | |
| 350 | 1252 | } | |
| 351 | ✗ | inline void set_is_bind_mountpoint(const bool val) { | |
| 352 | ✗ | is_bind_mountpoint_ = val; | |
| 353 | } | ||
| 354 | 680 | inline void set_is_chunked_file(const bool val) { is_chunked_file_ = val; } | |
| 355 | ✗ | inline void set_is_hidden(const bool val) { is_hidden_ = val; } | |
| 356 | |||
| 357 | private: | ||
| 358 | /** | ||
| 359 | * Hardlink handling is emulated in CVMFS. Since inodes are allocated on | ||
| 360 | * demand we save hardlink relationships using the same hardlink_group. | ||
| 361 | */ | ||
| 362 | uint32_t hardlink_group_; | ||
| 363 | |||
| 364 | // TODO(jblomer): transform into bitfield to save memory | ||
| 365 | bool is_nested_catalog_root_; | ||
| 366 | bool is_nested_catalog_mountpoint_; | ||
| 367 | bool is_bind_mountpoint_; | ||
| 368 | bool is_chunked_file_; | ||
| 369 | bool is_hidden_; | ||
| 370 | bool is_negative_; | ||
| 371 | }; | ||
| 372 | |||
| 373 | |||
| 374 | /** | ||
| 375 | * Saves memory for large directory listings. | ||
| 376 | */ | ||
| 377 | struct StatEntry { | ||
| 378 | NameString name; | ||
| 379 | struct stat info; | ||
| 380 | |||
| 381 | 117 | StatEntry() { memset(&info, 0, sizeof(info)); } | |
| 382 | StatEntry(const NameString &n, const struct stat &i) : name(n), info(i) { } | ||
| 383 | }; | ||
| 384 | |||
| 385 | |||
| 386 | typedef std::vector<DirectoryEntry> DirectoryEntryList; | ||
| 387 | typedef std::vector<DirectoryEntryBase> DirectoryEntryBaseList; | ||
| 388 | // TODO(jblomer): use mmap for large listings | ||
| 389 | typedef BigVector<StatEntry> StatEntryList; | ||
| 390 | |||
| 391 | } // namespace catalog | ||
| 392 | |||
| 393 | #endif // CVMFS_DIRECTORY_ENTRY_H_ | ||
| 394 |