Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 3 | * Copyright (c) 2013 Red Hat, Inc. |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it would be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | #ifndef __XFS_DIR2_FORMAT_H__ |
| 20 | #define __XFS_DIR2_FORMAT_H__ |
| 21 | |
| 22 | /* |
| 23 | * Directory version 2. |
| 24 | * |
| 25 | * There are 4 possible formats: |
| 26 | * - shortform - embedded into the inode |
| 27 | * - single block - data with embedded leaf at the end |
| 28 | * - multiple data blocks, single leaf+freeindex block |
| 29 | * - data blocks, node and leaf blocks (btree), freeindex blocks |
| 30 | * |
| 31 | * Note: many node blocks structures and constants are shared with the attr |
| 32 | * code and defined in xfs_da_btree.h. |
| 33 | */ |
| 34 | |
| 35 | #define XFS_DIR2_BLOCK_MAGIC 0x58443242 /* XD2B: single block dirs */ |
| 36 | #define XFS_DIR2_DATA_MAGIC 0x58443244 /* XD2D: multiblock dirs */ |
| 37 | #define XFS_DIR2_FREE_MAGIC 0x58443246 /* XD2F: free index blocks */ |
| 38 | |
| 39 | /* |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 40 | * Directory Version 3 With CRCs. |
| 41 | * |
| 42 | * The tree formats are the same as for version 2 directories. The difference |
| 43 | * is in the block header and dirent formats. In many cases the v3 structures |
| 44 | * use v2 definitions as they are no different and this makes code sharing much |
| 45 | * easier. |
| 46 | * |
| 47 | * Also, the xfs_dir3_*() functions handle both v2 and v3 formats - if the |
| 48 | * format is v2 then they switch to the existing v2 code, or the format is v3 |
| 49 | * they implement the v3 functionality. This means the existing dir2 is a mix of |
| 50 | * xfs_dir2/xfs_dir3 calls and functions. The xfs_dir3 functions are called |
| 51 | * where there is a difference in the formats, otherwise the code is unchanged. |
| 52 | * |
| 53 | * Where it is possible, the code decides what to do based on the magic numbers |
| 54 | * in the blocks rather than feature bits in the superblock. This means the code |
| 55 | * is as independent of the external XFS code as possible as doesn't require |
| 56 | * passing struct xfs_mount pointers into places where it isn't really |
| 57 | * necessary. |
| 58 | * |
| 59 | * Version 3 includes: |
| 60 | * |
| 61 | * - a larger block header for CRC and identification purposes and so the |
| 62 | * offsets of all the structures inside the blocks are different. |
| 63 | * |
| 64 | * - new magic numbers to be able to detect the v2/v3 types on the fly. |
| 65 | */ |
| 66 | |
| 67 | #define XFS_DIR3_BLOCK_MAGIC 0x58444233 /* XDB3: single block dirs */ |
| 68 | #define XFS_DIR3_DATA_MAGIC 0x58444433 /* XDD3: multiblock dirs */ |
Dave Chinner | cbc8adf | 2013-04-03 16:11:21 +1100 | [diff] [blame] | 69 | #define XFS_DIR3_FREE_MAGIC 0x58444633 /* XDF3: free index blocks */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 70 | |
| 71 | /* |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 72 | * Dirents in version 3 directories have a file type field. Additions to this |
| 73 | * list are an on-disk format change, requiring feature bits. Valid values |
| 74 | * are as follows: |
| 75 | */ |
| 76 | #define XFS_DIR3_FT_UNKNOWN 0 |
| 77 | #define XFS_DIR3_FT_REG_FILE 1 |
| 78 | #define XFS_DIR3_FT_DIR 2 |
| 79 | #define XFS_DIR3_FT_CHRDEV 3 |
| 80 | #define XFS_DIR3_FT_BLKDEV 4 |
| 81 | #define XFS_DIR3_FT_FIFO 5 |
| 82 | #define XFS_DIR3_FT_SOCK 6 |
| 83 | #define XFS_DIR3_FT_SYMLINK 7 |
| 84 | #define XFS_DIR3_FT_WHT 8 |
| 85 | |
| 86 | #define XFS_DIR3_FT_MAX 9 |
| 87 | |
| 88 | /* |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 89 | * Byte offset in data block and shortform entry. |
| 90 | */ |
| 91 | typedef __uint16_t xfs_dir2_data_off_t; |
| 92 | #define NULLDATAOFF 0xffffU |
| 93 | typedef uint xfs_dir2_data_aoff_t; /* argument form */ |
| 94 | |
| 95 | /* |
| 96 | * Normalized offset (in a data block) of the entry, really xfs_dir2_data_off_t. |
| 97 | * Only need 16 bits, this is the byte offset into the single block form. |
| 98 | */ |
| 99 | typedef struct { __uint8_t i[2]; } __arch_pack xfs_dir2_sf_off_t; |
| 100 | |
| 101 | /* |
| 102 | * Offset in data space of a data entry. |
| 103 | */ |
| 104 | typedef __uint32_t xfs_dir2_dataptr_t; |
| 105 | #define XFS_DIR2_MAX_DATAPTR ((xfs_dir2_dataptr_t)0xffffffff) |
| 106 | #define XFS_DIR2_NULL_DATAPTR ((xfs_dir2_dataptr_t)0) |
| 107 | |
| 108 | /* |
| 109 | * Byte offset in a directory. |
| 110 | */ |
| 111 | typedef xfs_off_t xfs_dir2_off_t; |
| 112 | |
| 113 | /* |
| 114 | * Directory block number (logical dirblk in file) |
| 115 | */ |
| 116 | typedef __uint32_t xfs_dir2_db_t; |
| 117 | |
| 118 | /* |
| 119 | * Inode number stored as 8 8-bit values. |
| 120 | */ |
| 121 | typedef struct { __uint8_t i[8]; } xfs_dir2_ino8_t; |
| 122 | |
| 123 | /* |
| 124 | * Inode number stored as 4 8-bit values. |
| 125 | * Works a lot of the time, when all the inode numbers in a directory |
| 126 | * fit in 32 bits. |
| 127 | */ |
| 128 | typedef struct { __uint8_t i[4]; } xfs_dir2_ino4_t; |
| 129 | |
| 130 | typedef union { |
| 131 | xfs_dir2_ino8_t i8; |
| 132 | xfs_dir2_ino4_t i4; |
| 133 | } xfs_dir2_inou_t; |
| 134 | #define XFS_DIR2_MAX_SHORT_INUM ((xfs_ino_t)0xffffffffULL) |
| 135 | |
| 136 | /* |
| 137 | * Directory layout when stored internal to an inode. |
| 138 | * |
| 139 | * Small directories are packed as tightly as possible so as to fit into the |
| 140 | * literal area of the inode. These "shortform" directories consist of a |
| 141 | * single xfs_dir2_sf_hdr header followed by zero or more xfs_dir2_sf_entry |
| 142 | * structures. Due the different inode number storage size and the variable |
| 143 | * length name field in the xfs_dir2_sf_entry all these structure are |
| 144 | * variable length, and the accessors in this file should be used to iterate |
| 145 | * over them. |
| 146 | */ |
| 147 | typedef struct xfs_dir2_sf_hdr { |
| 148 | __uint8_t count; /* count of entries */ |
| 149 | __uint8_t i8count; /* count of 8-byte inode #s */ |
| 150 | xfs_dir2_inou_t parent; /* parent dir inode number */ |
| 151 | } __arch_pack xfs_dir2_sf_hdr_t; |
| 152 | |
| 153 | typedef struct xfs_dir2_sf_entry { |
| 154 | __u8 namelen; /* actual name length */ |
| 155 | xfs_dir2_sf_off_t offset; /* saved offset */ |
| 156 | __u8 name[]; /* name, variable size */ |
| 157 | /* |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 158 | * A single byte containing the file type field follows the inode |
| 159 | * number for version 3 directory entries. |
| 160 | * |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 161 | * A xfs_dir2_ino8_t or xfs_dir2_ino4_t follows here, at a |
| 162 | * variable offset after the name. |
| 163 | */ |
| 164 | } __arch_pack xfs_dir2_sf_entry_t; |
| 165 | |
| 166 | static inline int xfs_dir2_sf_hdr_size(int i8count) |
| 167 | { |
| 168 | return sizeof(struct xfs_dir2_sf_hdr) - |
| 169 | (i8count == 0) * |
| 170 | (sizeof(xfs_dir2_ino8_t) - sizeof(xfs_dir2_ino4_t)); |
| 171 | } |
| 172 | |
| 173 | static inline xfs_dir2_data_aoff_t |
| 174 | xfs_dir2_sf_get_offset(xfs_dir2_sf_entry_t *sfep) |
| 175 | { |
| 176 | return get_unaligned_be16(&sfep->offset.i); |
| 177 | } |
| 178 | |
| 179 | static inline void |
| 180 | xfs_dir2_sf_put_offset(xfs_dir2_sf_entry_t *sfep, xfs_dir2_data_aoff_t off) |
| 181 | { |
| 182 | put_unaligned_be16(off, &sfep->offset.i); |
| 183 | } |
| 184 | |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 185 | static inline struct xfs_dir2_sf_entry * |
| 186 | xfs_dir2_sf_firstentry(struct xfs_dir2_sf_hdr *hdr) |
| 187 | { |
| 188 | return (struct xfs_dir2_sf_entry *) |
| 189 | ((char *)hdr + xfs_dir2_sf_hdr_size(hdr->i8count)); |
| 190 | } |
| 191 | |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 192 | static inline int |
| 193 | xfs_dir3_sf_entsize( |
| 194 | struct xfs_mount *mp, |
| 195 | struct xfs_dir2_sf_hdr *hdr, |
| 196 | int len) |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 197 | { |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 198 | int count = sizeof(struct xfs_dir2_sf_entry); /* namelen + offset */ |
| 199 | |
| 200 | count += len; /* name */ |
| 201 | count += hdr->i8count ? sizeof(xfs_dir2_ino8_t) : |
| 202 | sizeof(xfs_dir2_ino4_t); /* ino # */ |
| 203 | if (xfs_sb_version_hasftype(&mp->m_sb)) |
| 204 | count += sizeof(__uint8_t); /* file type */ |
| 205 | return count; |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 206 | } |
| 207 | |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 208 | static inline struct xfs_dir2_sf_entry * |
| 209 | xfs_dir3_sf_nextentry( |
| 210 | struct xfs_mount *mp, |
| 211 | struct xfs_dir2_sf_hdr *hdr, |
| 212 | struct xfs_dir2_sf_entry *sfep) |
| 213 | { |
| 214 | return (struct xfs_dir2_sf_entry *) |
| 215 | ((char *)sfep + xfs_dir3_sf_entsize(mp, hdr, sfep->namelen)); |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * in dir3 shortform directories, the file type field is stored at a variable |
| 220 | * offset after the inode number. Because it's only a single byte, endian |
| 221 | * conversion is not necessary. |
| 222 | */ |
| 223 | static inline __uint8_t * |
| 224 | xfs_dir3_sfe_ftypep( |
| 225 | struct xfs_dir2_sf_hdr *hdr, |
| 226 | struct xfs_dir2_sf_entry *sfep) |
| 227 | { |
| 228 | return (__uint8_t *)&sfep->name[sfep->namelen]; |
| 229 | } |
| 230 | |
| 231 | static inline __uint8_t |
| 232 | xfs_dir3_sfe_get_ftype( |
| 233 | struct xfs_mount *mp, |
| 234 | struct xfs_dir2_sf_hdr *hdr, |
| 235 | struct xfs_dir2_sf_entry *sfep) |
| 236 | { |
| 237 | __uint8_t *ftp; |
| 238 | |
| 239 | if (!xfs_sb_version_hasftype(&mp->m_sb)) |
| 240 | return XFS_DIR3_FT_UNKNOWN; |
| 241 | |
| 242 | ftp = xfs_dir3_sfe_ftypep(hdr, sfep); |
| 243 | if (*ftp >= XFS_DIR3_FT_MAX) |
| 244 | return XFS_DIR3_FT_UNKNOWN; |
| 245 | return *ftp; |
| 246 | } |
| 247 | |
| 248 | static inline void |
| 249 | xfs_dir3_sfe_put_ftype( |
| 250 | struct xfs_mount *mp, |
| 251 | struct xfs_dir2_sf_hdr *hdr, |
| 252 | struct xfs_dir2_sf_entry *sfep, |
| 253 | __uint8_t ftype) |
| 254 | { |
| 255 | __uint8_t *ftp; |
| 256 | |
| 257 | ASSERT(ftype < XFS_DIR3_FT_MAX); |
| 258 | |
| 259 | if (!xfs_sb_version_hasftype(&mp->m_sb)) |
| 260 | return; |
| 261 | ftp = xfs_dir3_sfe_ftypep(hdr, sfep); |
| 262 | *ftp = ftype; |
| 263 | } |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 264 | |
| 265 | /* |
| 266 | * Data block structures. |
| 267 | * |
| 268 | * A pure data block looks like the following drawing on disk: |
| 269 | * |
| 270 | * +-------------------------------------------------+ |
| 271 | * | xfs_dir2_data_hdr_t | |
| 272 | * +-------------------------------------------------+ |
| 273 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | |
| 274 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | |
| 275 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | |
| 276 | * | ... | |
| 277 | * +-------------------------------------------------+ |
| 278 | * | unused space | |
| 279 | * +-------------------------------------------------+ |
| 280 | * |
| 281 | * As all the entries are variable size structures the accessors below should |
| 282 | * be used to iterate over them. |
| 283 | * |
| 284 | * In addition to the pure data blocks for the data and node formats, |
| 285 | * most structures are also used for the combined data/freespace "block" |
| 286 | * format below. |
| 287 | */ |
| 288 | |
| 289 | #define XFS_DIR2_DATA_ALIGN_LOG 3 /* i.e., 8 bytes */ |
| 290 | #define XFS_DIR2_DATA_ALIGN (1 << XFS_DIR2_DATA_ALIGN_LOG) |
| 291 | #define XFS_DIR2_DATA_FREE_TAG 0xffff |
| 292 | #define XFS_DIR2_DATA_FD_COUNT 3 |
| 293 | |
| 294 | /* |
| 295 | * Directory address space divided into sections, |
| 296 | * spaces separated by 32GB. |
| 297 | */ |
| 298 | #define XFS_DIR2_SPACE_SIZE (1ULL << (32 + XFS_DIR2_DATA_ALIGN_LOG)) |
| 299 | #define XFS_DIR2_DATA_SPACE 0 |
| 300 | #define XFS_DIR2_DATA_OFFSET (XFS_DIR2_DATA_SPACE * XFS_DIR2_SPACE_SIZE) |
| 301 | #define XFS_DIR2_DATA_FIRSTDB(mp) \ |
| 302 | xfs_dir2_byte_to_db(mp, XFS_DIR2_DATA_OFFSET) |
| 303 | |
| 304 | /* |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 305 | * Describe a free area in the data block. |
| 306 | * |
| 307 | * The freespace will be formatted as a xfs_dir2_data_unused_t. |
| 308 | */ |
| 309 | typedef struct xfs_dir2_data_free { |
| 310 | __be16 offset; /* start of freespace */ |
| 311 | __be16 length; /* length of freespace */ |
| 312 | } xfs_dir2_data_free_t; |
| 313 | |
| 314 | /* |
| 315 | * Header for the data blocks. |
| 316 | * |
| 317 | * The code knows that XFS_DIR2_DATA_FD_COUNT is 3. |
| 318 | */ |
| 319 | typedef struct xfs_dir2_data_hdr { |
| 320 | __be32 magic; /* XFS_DIR2_DATA_MAGIC or */ |
| 321 | /* XFS_DIR2_BLOCK_MAGIC */ |
| 322 | xfs_dir2_data_free_t bestfree[XFS_DIR2_DATA_FD_COUNT]; |
| 323 | } xfs_dir2_data_hdr_t; |
| 324 | |
| 325 | /* |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 326 | * define a structure for all the verification fields we are adding to the |
| 327 | * directory block structures. This will be used in several structures. |
| 328 | * The magic number must be the first entry to align with all the dir2 |
| 329 | * structures so we determine how to decode them just by the magic number. |
| 330 | */ |
| 331 | struct xfs_dir3_blk_hdr { |
| 332 | __be32 magic; /* magic number */ |
| 333 | __be32 crc; /* CRC of block */ |
| 334 | __be64 blkno; /* first block of the buffer */ |
| 335 | __be64 lsn; /* sequence number of last write */ |
| 336 | uuid_t uuid; /* filesystem we belong to */ |
| 337 | __be64 owner; /* inode that owns the block */ |
| 338 | }; |
| 339 | |
| 340 | struct xfs_dir3_data_hdr { |
| 341 | struct xfs_dir3_blk_hdr hdr; |
| 342 | xfs_dir2_data_free_t best_free[XFS_DIR2_DATA_FD_COUNT]; |
Dave Chinner | 5170711 | 2013-06-12 12:19:07 +1000 | [diff] [blame] | 343 | __be32 pad; /* 64 bit alignment */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 344 | }; |
| 345 | |
| 346 | #define XFS_DIR3_DATA_CRC_OFF offsetof(struct xfs_dir3_data_hdr, hdr.crc) |
| 347 | |
| 348 | static inline struct xfs_dir2_data_free * |
| 349 | xfs_dir3_data_bestfree_p(struct xfs_dir2_data_hdr *hdr) |
| 350 | { |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 351 | if (hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
| 352 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) { |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 353 | struct xfs_dir3_data_hdr *hdr3 = (struct xfs_dir3_data_hdr *)hdr; |
| 354 | return hdr3->best_free; |
| 355 | } |
| 356 | return hdr->bestfree; |
| 357 | } |
| 358 | |
| 359 | /* |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 360 | * Active entry in a data block. |
| 361 | * |
| 362 | * Aligned to 8 bytes. After the variable length name field there is a |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 363 | * 2 byte tag field, which can be accessed using xfs_dir3_data_entry_tag_p. |
| 364 | * |
| 365 | * For dir3 structures, there is file type field between the name and the tag. |
| 366 | * This can only be manipulated by helper functions. It is packed hard against |
| 367 | * the end of the name so any padding for rounding is between the file type and |
| 368 | * the tag. |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 369 | */ |
| 370 | typedef struct xfs_dir2_data_entry { |
| 371 | __be64 inumber; /* inode number */ |
| 372 | __u8 namelen; /* name length */ |
| 373 | __u8 name[]; /* name bytes, no null */ |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 374 | /* __u8 filetype; */ /* type of inode we point to */ |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 375 | /* __be16 tag; */ /* starting offset of us */ |
| 376 | } xfs_dir2_data_entry_t; |
| 377 | |
| 378 | /* |
| 379 | * Unused entry in a data block. |
| 380 | * |
| 381 | * Aligned to 8 bytes. Tag appears as the last 2 bytes and must be accessed |
| 382 | * using xfs_dir2_data_unused_tag_p. |
| 383 | */ |
| 384 | typedef struct xfs_dir2_data_unused { |
| 385 | __be16 freetag; /* XFS_DIR2_DATA_FREE_TAG */ |
| 386 | __be16 length; /* total free length */ |
| 387 | /* variable offset */ |
| 388 | __be16 tag; /* starting offset of us */ |
| 389 | } xfs_dir2_data_unused_t; |
| 390 | |
| 391 | /* |
| 392 | * Size of a data entry. |
| 393 | */ |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 394 | static inline int |
| 395 | __xfs_dir3_data_entsize( |
| 396 | bool ftype, |
| 397 | int n) |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 398 | { |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 399 | int size = offsetof(struct xfs_dir2_data_entry, name[0]); |
| 400 | |
| 401 | size += n; |
| 402 | size += sizeof(xfs_dir2_data_off_t); |
| 403 | if (ftype) |
| 404 | size += sizeof(__uint8_t); |
| 405 | return roundup(size, XFS_DIR2_DATA_ALIGN); |
| 406 | } |
| 407 | static inline int |
| 408 | xfs_dir3_data_entsize( |
| 409 | struct xfs_mount *mp, |
| 410 | int n) |
| 411 | { |
| 412 | bool ftype = xfs_sb_version_hasftype(&mp->m_sb) ? true : false; |
| 413 | return __xfs_dir3_data_entsize(ftype, n); |
| 414 | } |
| 415 | |
| 416 | static inline __uint8_t |
| 417 | xfs_dir3_dirent_get_ftype( |
| 418 | struct xfs_mount *mp, |
| 419 | struct xfs_dir2_data_entry *dep) |
| 420 | { |
| 421 | if (xfs_sb_version_hasftype(&mp->m_sb)) { |
| 422 | __uint8_t type = dep->name[dep->namelen]; |
| 423 | |
| 424 | ASSERT(type < XFS_DIR3_FT_MAX); |
| 425 | if (type < XFS_DIR3_FT_MAX) |
| 426 | return type; |
| 427 | |
| 428 | } |
| 429 | return XFS_DIR3_FT_UNKNOWN; |
| 430 | } |
| 431 | |
| 432 | static inline void |
| 433 | xfs_dir3_dirent_put_ftype( |
| 434 | struct xfs_mount *mp, |
| 435 | struct xfs_dir2_data_entry *dep, |
| 436 | __uint8_t type) |
| 437 | { |
| 438 | ASSERT(type < XFS_DIR3_FT_MAX); |
| 439 | ASSERT(dep->namelen != 0); |
| 440 | |
| 441 | if (xfs_sb_version_hasftype(&mp->m_sb)) |
| 442 | dep->name[dep->namelen] = type; |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | /* |
| 446 | * Pointer to an entry's tag word. |
| 447 | */ |
| 448 | static inline __be16 * |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 449 | xfs_dir3_data_entry_tag_p( |
| 450 | struct xfs_mount *mp, |
| 451 | struct xfs_dir2_data_entry *dep) |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 452 | { |
| 453 | return (__be16 *)((char *)dep + |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 454 | xfs_dir3_data_entsize(mp, dep->namelen) - sizeof(__be16)); |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | /* |
| 458 | * Pointer to a freespace's tag word. |
| 459 | */ |
| 460 | static inline __be16 * |
| 461 | xfs_dir2_data_unused_tag_p(struct xfs_dir2_data_unused *dup) |
| 462 | { |
| 463 | return (__be16 *)((char *)dup + |
| 464 | be16_to_cpu(dup->length) - sizeof(__be16)); |
| 465 | } |
| 466 | |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 467 | static inline size_t |
| 468 | xfs_dir3_data_hdr_size(bool dir3) |
| 469 | { |
| 470 | if (dir3) |
| 471 | return sizeof(struct xfs_dir3_data_hdr); |
| 472 | return sizeof(struct xfs_dir2_data_hdr); |
| 473 | } |
| 474 | |
| 475 | static inline size_t |
| 476 | xfs_dir3_data_entry_offset(struct xfs_dir2_data_hdr *hdr) |
| 477 | { |
| 478 | bool dir3 = hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
| 479 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC); |
| 480 | return xfs_dir3_data_hdr_size(dir3); |
| 481 | } |
| 482 | |
| 483 | static inline struct xfs_dir2_data_entry * |
| 484 | xfs_dir3_data_entry_p(struct xfs_dir2_data_hdr *hdr) |
| 485 | { |
| 486 | return (struct xfs_dir2_data_entry *) |
| 487 | ((char *)hdr + xfs_dir3_data_entry_offset(hdr)); |
| 488 | } |
| 489 | |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 490 | static inline struct xfs_dir2_data_unused * |
| 491 | xfs_dir3_data_unused_p(struct xfs_dir2_data_hdr *hdr) |
| 492 | { |
| 493 | return (struct xfs_dir2_data_unused *) |
| 494 | ((char *)hdr + xfs_dir3_data_entry_offset(hdr)); |
| 495 | } |
| 496 | |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 497 | /* |
| 498 | * Offsets of . and .. in data space (always block 0) |
Dave Chinner | 6b2647a | 2013-04-03 16:11:24 +1100 | [diff] [blame] | 499 | * |
| 500 | * The macros are used for shortform directories as they have no headers to read |
| 501 | * the magic number out of. Shortform directories need to know the size of the |
| 502 | * data block header because the sfe embeds the block offset of the entry into |
| 503 | * it so that it doesn't change when format conversion occurs. Bad Things Happen |
| 504 | * if we don't follow this rule. |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 505 | * |
| 506 | * XXX: there is scope for significant optimisation of the logic here. Right |
| 507 | * now we are checking for "dir3 format" over and over again. Ideally we should |
| 508 | * only do it once for each operation. |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 509 | */ |
Dave Chinner | 6b2647a | 2013-04-03 16:11:24 +1100 | [diff] [blame] | 510 | #define XFS_DIR3_DATA_DOT_OFFSET(mp) \ |
| 511 | xfs_dir3_data_hdr_size(xfs_sb_version_hascrc(&(mp)->m_sb)) |
| 512 | #define XFS_DIR3_DATA_DOTDOT_OFFSET(mp) \ |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 513 | (XFS_DIR3_DATA_DOT_OFFSET(mp) + xfs_dir3_data_entsize(mp, 1)) |
Dave Chinner | 6b2647a | 2013-04-03 16:11:24 +1100 | [diff] [blame] | 514 | #define XFS_DIR3_DATA_FIRST_OFFSET(mp) \ |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 515 | (XFS_DIR3_DATA_DOTDOT_OFFSET(mp) + xfs_dir3_data_entsize(mp, 2)) |
Dave Chinner | 6b2647a | 2013-04-03 16:11:24 +1100 | [diff] [blame] | 516 | |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 517 | static inline xfs_dir2_data_aoff_t |
| 518 | xfs_dir3_data_dot_offset(struct xfs_dir2_data_hdr *hdr) |
| 519 | { |
| 520 | return xfs_dir3_data_entry_offset(hdr); |
| 521 | } |
| 522 | |
| 523 | static inline xfs_dir2_data_aoff_t |
| 524 | xfs_dir3_data_dotdot_offset(struct xfs_dir2_data_hdr *hdr) |
| 525 | { |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 526 | bool dir3 = hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
| 527 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC); |
| 528 | return xfs_dir3_data_dot_offset(hdr) + |
| 529 | __xfs_dir3_data_entsize(dir3, 1); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | static inline xfs_dir2_data_aoff_t |
| 533 | xfs_dir3_data_first_offset(struct xfs_dir2_data_hdr *hdr) |
| 534 | { |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 535 | bool dir3 = hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
| 536 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC); |
| 537 | return xfs_dir3_data_dotdot_offset(hdr) + |
| 538 | __xfs_dir3_data_entsize(dir3, 2); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | /* |
| 542 | * location of . and .. in data space (always block 0) |
| 543 | */ |
| 544 | static inline struct xfs_dir2_data_entry * |
| 545 | xfs_dir3_data_dot_entry_p(struct xfs_dir2_data_hdr *hdr) |
| 546 | { |
| 547 | return (struct xfs_dir2_data_entry *) |
| 548 | ((char *)hdr + xfs_dir3_data_dot_offset(hdr)); |
| 549 | } |
| 550 | |
| 551 | static inline struct xfs_dir2_data_entry * |
| 552 | xfs_dir3_data_dotdot_entry_p(struct xfs_dir2_data_hdr *hdr) |
| 553 | { |
| 554 | return (struct xfs_dir2_data_entry *) |
| 555 | ((char *)hdr + xfs_dir3_data_dotdot_offset(hdr)); |
| 556 | } |
| 557 | |
| 558 | static inline struct xfs_dir2_data_entry * |
| 559 | xfs_dir3_data_first_entry_p(struct xfs_dir2_data_hdr *hdr) |
| 560 | { |
| 561 | return (struct xfs_dir2_data_entry *) |
| 562 | ((char *)hdr + xfs_dir3_data_first_offset(hdr)); |
| 563 | } |
| 564 | |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 565 | /* |
| 566 | * Leaf block structures. |
| 567 | * |
| 568 | * A pure leaf block looks like the following drawing on disk: |
| 569 | * |
| 570 | * +---------------------------+ |
| 571 | * | xfs_dir2_leaf_hdr_t | |
| 572 | * +---------------------------+ |
| 573 | * | xfs_dir2_leaf_entry_t | |
| 574 | * | xfs_dir2_leaf_entry_t | |
| 575 | * | xfs_dir2_leaf_entry_t | |
| 576 | * | xfs_dir2_leaf_entry_t | |
| 577 | * | ... | |
| 578 | * +---------------------------+ |
| 579 | * | xfs_dir2_data_off_t | |
| 580 | * | xfs_dir2_data_off_t | |
| 581 | * | xfs_dir2_data_off_t | |
| 582 | * | ... | |
| 583 | * +---------------------------+ |
| 584 | * | xfs_dir2_leaf_tail_t | |
| 585 | * +---------------------------+ |
| 586 | * |
| 587 | * The xfs_dir2_data_off_t members (bests) and tail are at the end of the block |
| 588 | * for single-leaf (magic = XFS_DIR2_LEAF1_MAGIC) blocks only, but not present |
| 589 | * for directories with separate leaf nodes and free space blocks |
| 590 | * (magic = XFS_DIR2_LEAFN_MAGIC). |
| 591 | * |
| 592 | * As all the entries are variable size structures the accessors below should |
| 593 | * be used to iterate over them. |
| 594 | */ |
| 595 | |
| 596 | /* |
| 597 | * Offset of the leaf/node space. First block in this space |
| 598 | * is the btree root. |
| 599 | */ |
| 600 | #define XFS_DIR2_LEAF_SPACE 1 |
| 601 | #define XFS_DIR2_LEAF_OFFSET (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE) |
| 602 | #define XFS_DIR2_LEAF_FIRSTDB(mp) \ |
| 603 | xfs_dir2_byte_to_db(mp, XFS_DIR2_LEAF_OFFSET) |
| 604 | |
| 605 | /* |
| 606 | * Leaf block header. |
| 607 | */ |
| 608 | typedef struct xfs_dir2_leaf_hdr { |
| 609 | xfs_da_blkinfo_t info; /* header for da routines */ |
| 610 | __be16 count; /* count of entries */ |
| 611 | __be16 stale; /* count of stale entries */ |
| 612 | } xfs_dir2_leaf_hdr_t; |
| 613 | |
Dave Chinner | 24df33b | 2013-04-12 07:30:21 +1000 | [diff] [blame] | 614 | struct xfs_dir3_leaf_hdr { |
| 615 | struct xfs_da3_blkinfo info; /* header for da routines */ |
| 616 | __be16 count; /* count of entries */ |
| 617 | __be16 stale; /* count of stale entries */ |
Dave Chinner | 5170711 | 2013-06-12 12:19:07 +1000 | [diff] [blame] | 618 | __be32 pad; /* 64 bit alignment */ |
Dave Chinner | 24df33b | 2013-04-12 07:30:21 +1000 | [diff] [blame] | 619 | }; |
| 620 | |
| 621 | struct xfs_dir3_icleaf_hdr { |
| 622 | __uint32_t forw; |
| 623 | __uint32_t back; |
| 624 | __uint16_t magic; |
| 625 | __uint16_t count; |
| 626 | __uint16_t stale; |
| 627 | }; |
| 628 | |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 629 | /* |
| 630 | * Leaf block entry. |
| 631 | */ |
| 632 | typedef struct xfs_dir2_leaf_entry { |
| 633 | __be32 hashval; /* hash value of name */ |
| 634 | __be32 address; /* address of data entry */ |
| 635 | } xfs_dir2_leaf_entry_t; |
| 636 | |
| 637 | /* |
| 638 | * Leaf block tail. |
| 639 | */ |
| 640 | typedef struct xfs_dir2_leaf_tail { |
| 641 | __be32 bestcount; |
| 642 | } xfs_dir2_leaf_tail_t; |
| 643 | |
| 644 | /* |
| 645 | * Leaf block. |
| 646 | */ |
| 647 | typedef struct xfs_dir2_leaf { |
Dave Chinner | 24df33b | 2013-04-12 07:30:21 +1000 | [diff] [blame] | 648 | xfs_dir2_leaf_hdr_t hdr; /* leaf header */ |
| 649 | xfs_dir2_leaf_entry_t __ents[]; /* entries */ |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 650 | } xfs_dir2_leaf_t; |
| 651 | |
Dave Chinner | 24df33b | 2013-04-12 07:30:21 +1000 | [diff] [blame] | 652 | struct xfs_dir3_leaf { |
| 653 | struct xfs_dir3_leaf_hdr hdr; /* leaf header */ |
| 654 | struct xfs_dir2_leaf_entry __ents[]; /* entries */ |
| 655 | }; |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 656 | |
Dave Chinner | 24df33b | 2013-04-12 07:30:21 +1000 | [diff] [blame] | 657 | #define XFS_DIR3_LEAF_CRC_OFF offsetof(struct xfs_dir3_leaf_hdr, info.crc) |
| 658 | |
Dave Chinner | d386b32 | 2013-08-12 20:49:31 +1000 | [diff] [blame] | 659 | extern void xfs_dir3_leaf_hdr_from_disk(struct xfs_dir3_icleaf_hdr *to, |
| 660 | struct xfs_dir2_leaf *from); |
| 661 | |
Dave Chinner | 24df33b | 2013-04-12 07:30:21 +1000 | [diff] [blame] | 662 | static inline int |
| 663 | xfs_dir3_leaf_hdr_size(struct xfs_dir2_leaf *lp) |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 664 | { |
Dave Chinner | 24df33b | 2013-04-12 07:30:21 +1000 | [diff] [blame] | 665 | if (lp->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) || |
| 666 | lp->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)) |
| 667 | return sizeof(struct xfs_dir3_leaf_hdr); |
| 668 | return sizeof(struct xfs_dir2_leaf_hdr); |
| 669 | } |
| 670 | |
| 671 | static inline int |
| 672 | xfs_dir3_max_leaf_ents(struct xfs_mount *mp, struct xfs_dir2_leaf *lp) |
| 673 | { |
| 674 | return (mp->m_dirblksize - xfs_dir3_leaf_hdr_size(lp)) / |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 675 | (uint)sizeof(struct xfs_dir2_leaf_entry); |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * Get address of the bestcount field in the single-leaf block. |
| 680 | */ |
Dave Chinner | 24df33b | 2013-04-12 07:30:21 +1000 | [diff] [blame] | 681 | static inline struct xfs_dir2_leaf_entry * |
| 682 | xfs_dir3_leaf_ents_p(struct xfs_dir2_leaf *lp) |
| 683 | { |
| 684 | if (lp->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) || |
| 685 | lp->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)) { |
| 686 | struct xfs_dir3_leaf *lp3 = (struct xfs_dir3_leaf *)lp; |
| 687 | return lp3->__ents; |
| 688 | } |
| 689 | return lp->__ents; |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * Get address of the bestcount field in the single-leaf block. |
| 694 | */ |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 695 | static inline struct xfs_dir2_leaf_tail * |
| 696 | xfs_dir2_leaf_tail_p(struct xfs_mount *mp, struct xfs_dir2_leaf *lp) |
| 697 | { |
| 698 | return (struct xfs_dir2_leaf_tail *) |
| 699 | ((char *)lp + mp->m_dirblksize - |
| 700 | sizeof(struct xfs_dir2_leaf_tail)); |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * Get address of the bests array in the single-leaf block. |
| 705 | */ |
| 706 | static inline __be16 * |
| 707 | xfs_dir2_leaf_bests_p(struct xfs_dir2_leaf_tail *ltp) |
| 708 | { |
| 709 | return (__be16 *)ltp - be32_to_cpu(ltp->bestcount); |
| 710 | } |
| 711 | |
| 712 | /* |
Dave Chinner | 24df33b | 2013-04-12 07:30:21 +1000 | [diff] [blame] | 713 | * DB blocks here are logical directory block numbers, not filesystem blocks. |
| 714 | */ |
| 715 | |
| 716 | /* |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 717 | * Convert dataptr to byte in file space |
| 718 | */ |
| 719 | static inline xfs_dir2_off_t |
| 720 | xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) |
| 721 | { |
| 722 | return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG; |
| 723 | } |
| 724 | |
| 725 | /* |
| 726 | * Convert byte in file space to dataptr. It had better be aligned. |
| 727 | */ |
| 728 | static inline xfs_dir2_dataptr_t |
| 729 | xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by) |
| 730 | { |
| 731 | return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG); |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * Convert byte in space to (DB) block |
| 736 | */ |
| 737 | static inline xfs_dir2_db_t |
| 738 | xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by) |
| 739 | { |
| 740 | return (xfs_dir2_db_t) |
| 741 | (by >> (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)); |
| 742 | } |
| 743 | |
| 744 | /* |
| 745 | * Convert dataptr to a block number |
| 746 | */ |
| 747 | static inline xfs_dir2_db_t |
| 748 | xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) |
| 749 | { |
| 750 | return xfs_dir2_byte_to_db(mp, xfs_dir2_dataptr_to_byte(mp, dp)); |
| 751 | } |
| 752 | |
| 753 | /* |
| 754 | * Convert byte in space to offset in a block |
| 755 | */ |
| 756 | static inline xfs_dir2_data_aoff_t |
| 757 | xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by) |
| 758 | { |
| 759 | return (xfs_dir2_data_aoff_t)(by & |
| 760 | ((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) - 1)); |
| 761 | } |
| 762 | |
| 763 | /* |
| 764 | * Convert dataptr to a byte offset in a block |
| 765 | */ |
| 766 | static inline xfs_dir2_data_aoff_t |
| 767 | xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) |
| 768 | { |
| 769 | return xfs_dir2_byte_to_off(mp, xfs_dir2_dataptr_to_byte(mp, dp)); |
| 770 | } |
| 771 | |
| 772 | /* |
| 773 | * Convert block and offset to byte in space |
| 774 | */ |
| 775 | static inline xfs_dir2_off_t |
| 776 | xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db, |
| 777 | xfs_dir2_data_aoff_t o) |
| 778 | { |
| 779 | return ((xfs_dir2_off_t)db << |
| 780 | (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) + o; |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * Convert block (DB) to block (dablk) |
| 785 | */ |
| 786 | static inline xfs_dablk_t |
| 787 | xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db) |
| 788 | { |
| 789 | return (xfs_dablk_t)(db << mp->m_sb.sb_dirblklog); |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * Convert byte in space to (DA) block |
| 794 | */ |
| 795 | static inline xfs_dablk_t |
| 796 | xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by) |
| 797 | { |
| 798 | return xfs_dir2_db_to_da(mp, xfs_dir2_byte_to_db(mp, by)); |
| 799 | } |
| 800 | |
| 801 | /* |
| 802 | * Convert block and offset to dataptr |
| 803 | */ |
| 804 | static inline xfs_dir2_dataptr_t |
| 805 | xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db, |
| 806 | xfs_dir2_data_aoff_t o) |
| 807 | { |
| 808 | return xfs_dir2_byte_to_dataptr(mp, xfs_dir2_db_off_to_byte(mp, db, o)); |
| 809 | } |
| 810 | |
| 811 | /* |
| 812 | * Convert block (dablk) to block (DB) |
| 813 | */ |
| 814 | static inline xfs_dir2_db_t |
| 815 | xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da) |
| 816 | { |
| 817 | return (xfs_dir2_db_t)(da >> mp->m_sb.sb_dirblklog); |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * Convert block (dablk) to byte offset in space |
| 822 | */ |
| 823 | static inline xfs_dir2_off_t |
| 824 | xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da) |
| 825 | { |
| 826 | return xfs_dir2_db_off_to_byte(mp, xfs_dir2_da_to_db(mp, da), 0); |
| 827 | } |
| 828 | |
| 829 | /* |
| 830 | * Free space block defintions for the node format. |
| 831 | */ |
| 832 | |
| 833 | /* |
| 834 | * Offset of the freespace index. |
| 835 | */ |
| 836 | #define XFS_DIR2_FREE_SPACE 2 |
| 837 | #define XFS_DIR2_FREE_OFFSET (XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE) |
| 838 | #define XFS_DIR2_FREE_FIRSTDB(mp) \ |
| 839 | xfs_dir2_byte_to_db(mp, XFS_DIR2_FREE_OFFSET) |
| 840 | |
| 841 | typedef struct xfs_dir2_free_hdr { |
| 842 | __be32 magic; /* XFS_DIR2_FREE_MAGIC */ |
| 843 | __be32 firstdb; /* db of first entry */ |
| 844 | __be32 nvalid; /* count of valid entries */ |
| 845 | __be32 nused; /* count of used entries */ |
| 846 | } xfs_dir2_free_hdr_t; |
| 847 | |
| 848 | typedef struct xfs_dir2_free { |
| 849 | xfs_dir2_free_hdr_t hdr; /* block header */ |
Christoph Hellwig | a00b774 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 850 | __be16 bests[]; /* best free counts */ |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 851 | /* unused entries are -1 */ |
| 852 | } xfs_dir2_free_t; |
| 853 | |
Dave Chinner | cbc8adf | 2013-04-03 16:11:21 +1100 | [diff] [blame] | 854 | struct xfs_dir3_free_hdr { |
| 855 | struct xfs_dir3_blk_hdr hdr; |
| 856 | __be32 firstdb; /* db of first entry */ |
| 857 | __be32 nvalid; /* count of valid entries */ |
| 858 | __be32 nused; /* count of used entries */ |
Dave Chinner | 5170711 | 2013-06-12 12:19:07 +1000 | [diff] [blame] | 859 | __be32 pad; /* 64 bit alignment */ |
Dave Chinner | cbc8adf | 2013-04-03 16:11:21 +1100 | [diff] [blame] | 860 | }; |
| 861 | |
| 862 | struct xfs_dir3_free { |
| 863 | struct xfs_dir3_free_hdr hdr; |
| 864 | __be16 bests[]; /* best free counts */ |
| 865 | /* unused entries are -1 */ |
| 866 | }; |
| 867 | |
| 868 | #define XFS_DIR3_FREE_CRC_OFF offsetof(struct xfs_dir3_free, hdr.hdr.crc) |
| 869 | |
| 870 | /* |
| 871 | * In core version of the free block header, abstracted away from on-disk format |
| 872 | * differences. Use this in the code, and convert to/from the disk version using |
| 873 | * xfs_dir3_free_hdr_from_disk/xfs_dir3_free_hdr_to_disk. |
| 874 | */ |
| 875 | struct xfs_dir3_icfree_hdr { |
| 876 | __uint32_t magic; |
| 877 | __uint32_t firstdb; |
| 878 | __uint32_t nvalid; |
| 879 | __uint32_t nused; |
| 880 | |
| 881 | }; |
| 882 | |
| 883 | void xfs_dir3_free_hdr_from_disk(struct xfs_dir3_icfree_hdr *to, |
| 884 | struct xfs_dir2_free *from); |
| 885 | |
| 886 | static inline int |
| 887 | xfs_dir3_free_hdr_size(struct xfs_mount *mp) |
Christoph Hellwig | a00b774 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 888 | { |
Dave Chinner | cbc8adf | 2013-04-03 16:11:21 +1100 | [diff] [blame] | 889 | if (xfs_sb_version_hascrc(&mp->m_sb)) |
| 890 | return sizeof(struct xfs_dir3_free_hdr); |
| 891 | return sizeof(struct xfs_dir2_free_hdr); |
| 892 | } |
| 893 | |
| 894 | static inline int |
| 895 | xfs_dir3_free_max_bests(struct xfs_mount *mp) |
| 896 | { |
| 897 | return (mp->m_dirblksize - xfs_dir3_free_hdr_size(mp)) / |
Christoph Hellwig | a00b774 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 898 | sizeof(xfs_dir2_data_off_t); |
| 899 | } |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 900 | |
Dave Chinner | cbc8adf | 2013-04-03 16:11:21 +1100 | [diff] [blame] | 901 | static inline __be16 * |
| 902 | xfs_dir3_free_bests_p(struct xfs_mount *mp, struct xfs_dir2_free *free) |
| 903 | { |
| 904 | return (__be16 *)((char *)free + xfs_dir3_free_hdr_size(mp)); |
| 905 | } |
| 906 | |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 907 | /* |
| 908 | * Convert data space db to the corresponding free db. |
| 909 | */ |
| 910 | static inline xfs_dir2_db_t |
| 911 | xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db) |
| 912 | { |
Dave Chinner | cbc8adf | 2013-04-03 16:11:21 +1100 | [diff] [blame] | 913 | return XFS_DIR2_FREE_FIRSTDB(mp) + db / xfs_dir3_free_max_bests(mp); |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 914 | } |
| 915 | |
| 916 | /* |
| 917 | * Convert data space db to the corresponding index in a free db. |
| 918 | */ |
| 919 | static inline int |
| 920 | xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db) |
| 921 | { |
Dave Chinner | cbc8adf | 2013-04-03 16:11:21 +1100 | [diff] [blame] | 922 | return db % xfs_dir3_free_max_bests(mp); |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 923 | } |
| 924 | |
| 925 | /* |
| 926 | * Single block format. |
| 927 | * |
| 928 | * The single block format looks like the following drawing on disk: |
| 929 | * |
| 930 | * +-------------------------------------------------+ |
| 931 | * | xfs_dir2_data_hdr_t | |
| 932 | * +-------------------------------------------------+ |
| 933 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | |
| 934 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | |
| 935 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t : |
| 936 | * | ... | |
| 937 | * +-------------------------------------------------+ |
| 938 | * | unused space | |
| 939 | * +-------------------------------------------------+ |
| 940 | * | ... | |
| 941 | * | xfs_dir2_leaf_entry_t | |
| 942 | * | xfs_dir2_leaf_entry_t | |
| 943 | * +-------------------------------------------------+ |
| 944 | * | xfs_dir2_block_tail_t | |
| 945 | * +-------------------------------------------------+ |
| 946 | * |
| 947 | * As all the entries are variable size structures the accessors below should |
| 948 | * be used to iterate over them. |
| 949 | */ |
| 950 | |
| 951 | typedef struct xfs_dir2_block_tail { |
| 952 | __be32 count; /* count of leaf entries */ |
| 953 | __be32 stale; /* count of stale lf entries */ |
| 954 | } xfs_dir2_block_tail_t; |
| 955 | |
| 956 | /* |
| 957 | * Pointer to the leaf header embedded in a data block (1-block format) |
| 958 | */ |
| 959 | static inline struct xfs_dir2_block_tail * |
| 960 | xfs_dir2_block_tail_p(struct xfs_mount *mp, struct xfs_dir2_data_hdr *hdr) |
| 961 | { |
| 962 | return ((struct xfs_dir2_block_tail *) |
| 963 | ((char *)hdr + mp->m_dirblksize)) - 1; |
| 964 | } |
| 965 | |
| 966 | /* |
| 967 | * Pointer to the leaf entries embedded in a data block (1-block format) |
| 968 | */ |
| 969 | static inline struct xfs_dir2_leaf_entry * |
| 970 | xfs_dir2_block_leaf_p(struct xfs_dir2_block_tail *btp) |
| 971 | { |
| 972 | return ((struct xfs_dir2_leaf_entry *)btp) - be32_to_cpu(btp->count); |
| 973 | } |
| 974 | |
| 975 | #endif /* __XFS_DIR2_FORMAT_H__ */ |