1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * Copyright (c) 2013 Red Hat, Inc. 5 * All Rights Reserved. 6 */ 7 #include "xfs.h" 8 #include "xfs_fs.h" 9 #include "xfs_shared.h" 10 #include "xfs_format.h" 11 #include "xfs_log_format.h" 12 #include "xfs_trans_resv.h" 13 #include "xfs_sb.h" 14 #include "xfs_mount.h" 15 #include "xfs_da_format.h" 16 #include "xfs_da_btree.h" 17 #include "xfs_inode.h" 18 #include "xfs_trans.h" 19 #include "xfs_bmap_btree.h" 20 #include "xfs_bmap.h" 21 #include "xfs_attr_sf.h" 22 #include "xfs_attr.h" 23 #include "xfs_attr_remote.h" 24 #include "xfs_attr_leaf.h" 25 #include "xfs_error.h" 26 #include "xfs_trace.h" 27 #include "xfs_buf_item.h" 28 #include "xfs_dir2.h" 29 #include "xfs_log.h" 30 #include "xfs_ag.h" 31 32 33 /* 34 * xfs_attr_leaf.c 35 * 36 * Routines to implement leaf blocks of attributes as Btrees of hashed names. 37 */ 38 39 /*======================================================================== 40 * Function prototypes for the kernel. 41 *========================================================================*/ 42 43 /* 44 * Routines used for growing the Btree. 45 */ 46 STATIC int xfs_attr3_leaf_create(struct xfs_da_args *args, 47 xfs_dablk_t which_block, struct xfs_buf **bpp); 48 STATIC int xfs_attr3_leaf_add_work(struct xfs_buf *leaf_buffer, 49 struct xfs_attr3_icleaf_hdr *ichdr, 50 struct xfs_da_args *args, int freemap_index); 51 STATIC void xfs_attr3_leaf_compact(struct xfs_da_args *args, 52 struct xfs_attr3_icleaf_hdr *ichdr, 53 struct xfs_buf *leaf_buffer); 54 STATIC void xfs_attr3_leaf_rebalance(xfs_da_state_t *state, 55 xfs_da_state_blk_t *blk1, 56 xfs_da_state_blk_t *blk2); 57 STATIC int xfs_attr3_leaf_figure_balance(xfs_da_state_t *state, 58 xfs_da_state_blk_t *leaf_blk_1, 59 struct xfs_attr3_icleaf_hdr *ichdr1, 60 xfs_da_state_blk_t *leaf_blk_2, 61 struct xfs_attr3_icleaf_hdr *ichdr2, 62 int *number_entries_in_blk1, 63 int *number_usedbytes_in_blk1); 64 65 /* 66 * Utility routines. 67 */ 68 STATIC void xfs_attr3_leaf_moveents(struct xfs_da_args *args, 69 struct xfs_attr_leafblock *src_leaf, 70 struct xfs_attr3_icleaf_hdr *src_ichdr, int src_start, 71 struct xfs_attr_leafblock *dst_leaf, 72 struct xfs_attr3_icleaf_hdr *dst_ichdr, int dst_start, 73 int move_count); 74 STATIC int xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index); 75 76 /* 77 * attr3 block 'firstused' conversion helpers. 78 * 79 * firstused refers to the offset of the first used byte of the nameval region 80 * of an attr leaf block. The region starts at the tail of the block and expands 81 * backwards towards the middle. As such, firstused is initialized to the block 82 * size for an empty leaf block and is reduced from there. 83 * 84 * The attr3 block size is pegged to the fsb size and the maximum fsb is 64k. 85 * The in-core firstused field is 32-bit and thus supports the maximum fsb size. 86 * The on-disk field is only 16-bit, however, and overflows at 64k. Since this 87 * only occurs at exactly 64k, we use zero as a magic on-disk value to represent 88 * the attr block size. The following helpers manage the conversion between the 89 * in-core and on-disk formats. 90 */ 91 92 static void 93 xfs_attr3_leaf_firstused_from_disk( 94 struct xfs_da_geometry *geo, 95 struct xfs_attr3_icleaf_hdr *to, 96 struct xfs_attr_leafblock *from) 97 { 98 struct xfs_attr3_leaf_hdr *hdr3; 99 100 if (from->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC)) { 101 hdr3 = (struct xfs_attr3_leaf_hdr *) from; 102 to->firstused = be16_to_cpu(hdr3->firstused); 103 } else { 104 to->firstused = be16_to_cpu(from->hdr.firstused); 105 } 106 107 /* 108 * Convert from the magic fsb size value to actual blocksize. This 109 * should only occur for empty blocks when the block size overflows 110 * 16-bits. 111 */ 112 if (to->firstused == XFS_ATTR3_LEAF_NULLOFF) { 113 ASSERT(!to->count && !to->usedbytes); 114 ASSERT(geo->blksize > USHRT_MAX); 115 to->firstused = geo->blksize; 116 } 117 } 118 119 static void 120 xfs_attr3_leaf_firstused_to_disk( 121 struct xfs_da_geometry *geo, 122 struct xfs_attr_leafblock *to, 123 struct xfs_attr3_icleaf_hdr *from) 124 { 125 struct xfs_attr3_leaf_hdr *hdr3; 126 uint32_t firstused; 127 128 /* magic value should only be seen on disk */ 129 ASSERT(from->firstused != XFS_ATTR3_LEAF_NULLOFF); 130 131 /* 132 * Scale down the 32-bit in-core firstused value to the 16-bit on-disk 133 * value. This only overflows at the max supported value of 64k. Use the 134 * magic on-disk value to represent block size in this case. 135 */ 136 firstused = from->firstused; 137 if (firstused > USHRT_MAX) { 138 ASSERT(from->firstused == geo->blksize); 139 firstused = XFS_ATTR3_LEAF_NULLOFF; 140 } 141 142 if (from->magic == XFS_ATTR3_LEAF_MAGIC) { 143 hdr3 = (struct xfs_attr3_leaf_hdr *) to; 144 hdr3->firstused = cpu_to_be16(firstused); 145 } else { 146 to->hdr.firstused = cpu_to_be16(firstused); 147 } 148 } 149 150 void 151 xfs_attr3_leaf_hdr_from_disk( 152 struct xfs_da_geometry *geo, 153 struct xfs_attr3_icleaf_hdr *to, 154 struct xfs_attr_leafblock *from) 155 { 156 int i; 157 158 ASSERT(from->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC) || 159 from->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC)); 160 161 if (from->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC)) { 162 struct xfs_attr3_leaf_hdr *hdr3 = (struct xfs_attr3_leaf_hdr *)from; 163 164 to->forw = be32_to_cpu(hdr3->info.hdr.forw); 165 to->back = be32_to_cpu(hdr3->info.hdr.back); 166 to->magic = be16_to_cpu(hdr3->info.hdr.magic); 167 to->count = be16_to_cpu(hdr3->count); 168 to->usedbytes = be16_to_cpu(hdr3->usedbytes); 169 xfs_attr3_leaf_firstused_from_disk(geo, to, from); 170 to->holes = hdr3->holes; 171 172 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) { 173 to->freemap[i].base = be16_to_cpu(hdr3->freemap[i].base); 174 to->freemap[i].size = be16_to_cpu(hdr3->freemap[i].size); 175 } 176 return; 177 } 178 to->forw = be32_to_cpu(from->hdr.info.forw); 179 to->back = be32_to_cpu(from->hdr.info.back); 180 to->magic = be16_to_cpu(from->hdr.info.magic); 181 to->count = be16_to_cpu(from->hdr.count); 182 to->usedbytes = be16_to_cpu(from->hdr.usedbytes); 183 xfs_attr3_leaf_firstused_from_disk(geo, to, from); 184 to->holes = from->hdr.holes; 185 186 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) { 187 to->freemap[i].base = be16_to_cpu(from->hdr.freemap[i].base); 188 to->freemap[i].size = be16_to_cpu(from->hdr.freemap[i].size); 189 } 190 } 191 192 void 193 xfs_attr3_leaf_hdr_to_disk( 194 struct xfs_da_geometry *geo, 195 struct xfs_attr_leafblock *to, 196 struct xfs_attr3_icleaf_hdr *from) 197 { 198 int i; 199 200 ASSERT(from->magic == XFS_ATTR_LEAF_MAGIC || 201 from->magic == XFS_ATTR3_LEAF_MAGIC); 202 203 if (from->magic == XFS_ATTR3_LEAF_MAGIC) { 204 struct xfs_attr3_leaf_hdr *hdr3 = (struct xfs_attr3_leaf_hdr *)to; 205 206 hdr3->info.hdr.forw = cpu_to_be32(from->forw); 207 hdr3->info.hdr.back = cpu_to_be32(from->back); 208 hdr3->info.hdr.magic = cpu_to_be16(from->magic); 209 hdr3->count = cpu_to_be16(from->count); 210 hdr3->usedbytes = cpu_to_be16(from->usedbytes); 211 xfs_attr3_leaf_firstused_to_disk(geo, to, from); 212 hdr3->holes = from->holes; 213 hdr3->pad1 = 0; 214 215 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) { 216 hdr3->freemap[i].base = cpu_to_be16(from->freemap[i].base); 217 hdr3->freemap[i].size = cpu_to_be16(from->freemap[i].size); 218 } 219 return; 220 } 221 to->hdr.info.forw = cpu_to_be32(from->forw); 222 to->hdr.info.back = cpu_to_be32(from->back); 223 to->hdr.info.magic = cpu_to_be16(from->magic); 224 to->hdr.count = cpu_to_be16(from->count); 225 to->hdr.usedbytes = cpu_to_be16(from->usedbytes); 226 xfs_attr3_leaf_firstused_to_disk(geo, to, from); 227 to->hdr.holes = from->holes; 228 to->hdr.pad1 = 0; 229 230 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) { 231 to->hdr.freemap[i].base = cpu_to_be16(from->freemap[i].base); 232 to->hdr.freemap[i].size = cpu_to_be16(from->freemap[i].size); 233 } 234 } 235 236 static xfs_failaddr_t 237 xfs_attr3_leaf_verify_entry( 238 struct xfs_mount *mp, 239 char *buf_end, 240 struct xfs_attr_leafblock *leaf, 241 struct xfs_attr3_icleaf_hdr *leafhdr, 242 struct xfs_attr_leaf_entry *ent, 243 int idx, 244 __u32 *last_hashval) 245 { 246 struct xfs_attr_leaf_name_local *lentry; 247 struct xfs_attr_leaf_name_remote *rentry; 248 char *name_end; 249 unsigned int nameidx; 250 unsigned int namesize; 251 __u32 hashval; 252 253 /* hash order check */ 254 hashval = be32_to_cpu(ent->hashval); 255 if (hashval < *last_hashval) 256 return __this_address; 257 *last_hashval = hashval; 258 259 nameidx = be16_to_cpu(ent->nameidx); 260 if (nameidx < leafhdr->firstused || nameidx >= mp->m_attr_geo->blksize) 261 return __this_address; 262 263 /* 264 * Check the name information. The namelen fields are u8 so we can't 265 * possibly exceed the maximum name length of 255 bytes. 266 */ 267 if (ent->flags & XFS_ATTR_LOCAL) { 268 lentry = xfs_attr3_leaf_name_local(leaf, idx); 269 namesize = xfs_attr_leaf_entsize_local(lentry->namelen, 270 be16_to_cpu(lentry->valuelen)); 271 name_end = (char *)lentry + namesize; 272 if (lentry->namelen == 0) 273 return __this_address; 274 } else { 275 rentry = xfs_attr3_leaf_name_remote(leaf, idx); 276 namesize = xfs_attr_leaf_entsize_remote(rentry->namelen); 277 name_end = (char *)rentry + namesize; 278 if (rentry->namelen == 0) 279 return __this_address; 280 if (!(ent->flags & XFS_ATTR_INCOMPLETE) && 281 rentry->valueblk == 0) 282 return __this_address; 283 } 284 285 if (name_end > buf_end) 286 return __this_address; 287 288 return NULL; 289 } 290 291 static xfs_failaddr_t 292 xfs_attr3_leaf_verify( 293 struct xfs_buf *bp) 294 { 295 struct xfs_attr3_icleaf_hdr ichdr; 296 struct xfs_mount *mp = bp->b_mount; 297 struct xfs_attr_leafblock *leaf = bp->b_addr; 298 struct xfs_attr_leaf_entry *entries; 299 struct xfs_attr_leaf_entry *ent; 300 char *buf_end; 301 uint32_t end; /* must be 32bit - see below */ 302 __u32 last_hashval = 0; 303 int i; 304 xfs_failaddr_t fa; 305 306 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf); 307 308 fa = xfs_da3_blkinfo_verify(bp, bp->b_addr); 309 if (fa) 310 return fa; 311 312 /* 313 * firstused is the block offset of the first name info structure. 314 * Make sure it doesn't go off the block or crash into the header. 315 */ 316 if (ichdr.firstused > mp->m_attr_geo->blksize) 317 return __this_address; 318 if (ichdr.firstused < xfs_attr3_leaf_hdr_size(leaf)) 319 return __this_address; 320 321 /* Make sure the entries array doesn't crash into the name info. */ 322 entries = xfs_attr3_leaf_entryp(bp->b_addr); 323 if ((char *)&entries[ichdr.count] > 324 (char *)bp->b_addr + ichdr.firstused) 325 return __this_address; 326 327 /* 328 * NOTE: This verifier historically failed empty leaf buffers because 329 * we expect the fork to be in another format. Empty attr fork format 330 * conversions are possible during xattr set, however, and format 331 * conversion is not atomic with the xattr set that triggers it. We 332 * cannot assume leaf blocks are non-empty until that is addressed. 333 */ 334 buf_end = (char *)bp->b_addr + mp->m_attr_geo->blksize; 335 for (i = 0, ent = entries; i < ichdr.count; ent++, i++) { 336 fa = xfs_attr3_leaf_verify_entry(mp, buf_end, leaf, &ichdr, 337 ent, i, &last_hashval); 338 if (fa) 339 return fa; 340 } 341 342 /* 343 * Quickly check the freemap information. Attribute data has to be 344 * aligned to 4-byte boundaries, and likewise for the free space. 345 * 346 * Note that for 64k block size filesystems, the freemap entries cannot 347 * overflow as they are only be16 fields. However, when checking end 348 * pointer of the freemap, we have to be careful to detect overflows and 349 * so use uint32_t for those checks. 350 */ 351 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) { 352 if (ichdr.freemap[i].base > mp->m_attr_geo->blksize) 353 return __this_address; 354 if (ichdr.freemap[i].base & 0x3) 355 return __this_address; 356 if (ichdr.freemap[i].size > mp->m_attr_geo->blksize) 357 return __this_address; 358 if (ichdr.freemap[i].size & 0x3) 359 return __this_address; 360 361 /* be care of 16 bit overflows here */ 362 end = (uint32_t)ichdr.freemap[i].base + ichdr.freemap[i].size; 363 if (end < ichdr.freemap[i].base) 364 return __this_address; 365 if (end > mp->m_attr_geo->blksize) 366 return __this_address; 367 } 368 369 return NULL; 370 } 371 372 static void 373 xfs_attr3_leaf_write_verify( 374 struct xfs_buf *bp) 375 { 376 struct xfs_mount *mp = bp->b_mount; 377 struct xfs_buf_log_item *bip = bp->b_log_item; 378 struct xfs_attr3_leaf_hdr *hdr3 = bp->b_addr; 379 xfs_failaddr_t fa; 380 381 fa = xfs_attr3_leaf_verify(bp); 382 if (fa) { 383 xfs_verifier_error(bp, -EFSCORRUPTED, fa); 384 return; 385 } 386 387 if (!xfs_has_crc(mp)) 388 return; 389 390 if (bip) 391 hdr3->info.lsn = cpu_to_be64(bip->bli_item.li_lsn); 392 393 xfs_buf_update_cksum(bp, XFS_ATTR3_LEAF_CRC_OFF); 394 } 395 396 /* 397 * leaf/node format detection on trees is sketchy, so a node read can be done on 398 * leaf level blocks when detection identifies the tree as a node format tree 399 * incorrectly. In this case, we need to swap the verifier to match the correct 400 * format of the block being read. 401 */ 402 static void 403 xfs_attr3_leaf_read_verify( 404 struct xfs_buf *bp) 405 { 406 struct xfs_mount *mp = bp->b_mount; 407 xfs_failaddr_t fa; 408 409 if (xfs_has_crc(mp) && 410 !xfs_buf_verify_cksum(bp, XFS_ATTR3_LEAF_CRC_OFF)) 411 xfs_verifier_error(bp, -EFSBADCRC, __this_address); 412 else { 413 fa = xfs_attr3_leaf_verify(bp); 414 if (fa) 415 xfs_verifier_error(bp, -EFSCORRUPTED, fa); 416 } 417 } 418 419 const struct xfs_buf_ops xfs_attr3_leaf_buf_ops = { 420 .name = "xfs_attr3_leaf", 421 .magic16 = { cpu_to_be16(XFS_ATTR_LEAF_MAGIC), 422 cpu_to_be16(XFS_ATTR3_LEAF_MAGIC) }, 423 .verify_read = xfs_attr3_leaf_read_verify, 424 .verify_write = xfs_attr3_leaf_write_verify, 425 .verify_struct = xfs_attr3_leaf_verify, 426 }; 427 428 int 429 xfs_attr3_leaf_read( 430 struct xfs_trans *tp, 431 struct xfs_inode *dp, 432 xfs_dablk_t bno, 433 struct xfs_buf **bpp) 434 { 435 int err; 436 437 err = xfs_da_read_buf(tp, dp, bno, 0, bpp, XFS_ATTR_FORK, 438 &xfs_attr3_leaf_buf_ops); 439 if (!err && tp && *bpp) 440 xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_ATTR_LEAF_BUF); 441 return err; 442 } 443 444 /*======================================================================== 445 * Namespace helper routines 446 *========================================================================*/ 447 448 static bool 449 xfs_attr_match( 450 struct xfs_da_args *args, 451 uint8_t namelen, 452 unsigned char *name, 453 int flags) 454 { 455 if (args->namelen != namelen) 456 return false; 457 if (memcmp(args->name, name, namelen) != 0) 458 return false; 459 /* 460 * If we are looking for incomplete entries, show only those, else only 461 * show complete entries. 462 */ 463 if (args->attr_filter != 464 (flags & (XFS_ATTR_NSP_ONDISK_MASK | XFS_ATTR_INCOMPLETE))) 465 return false; 466 return true; 467 } 468 469 static int 470 xfs_attr_copy_value( 471 struct xfs_da_args *args, 472 unsigned char *value, 473 int valuelen) 474 { 475 /* 476 * No copy if all we have to do is get the length 477 */ 478 if (!args->valuelen) { 479 args->valuelen = valuelen; 480 return 0; 481 } 482 483 /* 484 * No copy if the length of the existing buffer is too small 485 */ 486 if (args->valuelen < valuelen) { 487 args->valuelen = valuelen; 488 return -ERANGE; 489 } 490 491 if (!args->value) { 492 args->value = kvmalloc(valuelen, GFP_KERNEL | __GFP_NOLOCKDEP); 493 if (!args->value) 494 return -ENOMEM; 495 } 496 args->valuelen = valuelen; 497 498 /* remote block xattr requires IO for copy-in */ 499 if (args->rmtblkno) 500 return xfs_attr_rmtval_get(args); 501 502 /* 503 * This is to prevent a GCC warning because the remote xattr case 504 * doesn't have a value to pass in. In that case, we never reach here, 505 * but GCC can't work that out and so throws a "passing NULL to 506 * memcpy" warning. 507 */ 508 if (!value) 509 return -EINVAL; 510 memcpy(args->value, value, valuelen); 511 return 0; 512 } 513 514 /*======================================================================== 515 * External routines when attribute fork size < XFS_LITINO(mp). 516 *========================================================================*/ 517 518 /* 519 * Query whether the total requested number of attr fork bytes of extended 520 * attribute space will be able to fit inline. 521 * 522 * Returns zero if not, else the i_forkoff fork offset to be used in the 523 * literal area for attribute data once the new bytes have been added. 524 * 525 * i_forkoff must be 8 byte aligned, hence is stored as a >>3 value; 526 * special case for dev/uuid inodes, they have fixed size data forks. 527 */ 528 int 529 xfs_attr_shortform_bytesfit( 530 struct xfs_inode *dp, 531 int bytes) 532 { 533 struct xfs_mount *mp = dp->i_mount; 534 int64_t dsize; 535 int minforkoff; 536 int maxforkoff; 537 int offset; 538 539 /* 540 * Check if the new size could fit at all first: 541 */ 542 if (bytes > XFS_LITINO(mp)) 543 return 0; 544 545 /* rounded down */ 546 offset = (XFS_LITINO(mp) - bytes) >> 3; 547 548 if (dp->i_df.if_format == XFS_DINODE_FMT_DEV) { 549 minforkoff = roundup(sizeof(xfs_dev_t), 8) >> 3; 550 return (offset >= minforkoff) ? minforkoff : 0; 551 } 552 553 /* 554 * If the requested numbers of bytes is smaller or equal to the 555 * current attribute fork size we can always proceed. 556 * 557 * Note that if_bytes in the data fork might actually be larger than 558 * the current data fork size is due to delalloc extents. In that 559 * case either the extent count will go down when they are converted 560 * to real extents, or the delalloc conversion will take care of the 561 * literal area rebalancing. 562 */ 563 if (bytes <= XFS_IFORK_ASIZE(dp)) 564 return dp->i_forkoff; 565 566 /* 567 * For attr2 we can try to move the forkoff if there is space in the 568 * literal area, but for the old format we are done if there is no 569 * space in the fixed attribute fork. 570 */ 571 if (!xfs_has_attr2(mp)) 572 return 0; 573 574 dsize = dp->i_df.if_bytes; 575 576 switch (dp->i_df.if_format) { 577 case XFS_DINODE_FMT_EXTENTS: 578 /* 579 * If there is no attr fork and the data fork is extents, 580 * determine if creating the default attr fork will result 581 * in the extents form migrating to btree. If so, the 582 * minimum offset only needs to be the space required for 583 * the btree root. 584 */ 585 if (!dp->i_forkoff && dp->i_df.if_bytes > 586 xfs_default_attroffset(dp)) 587 dsize = XFS_BMDR_SPACE_CALC(MINDBTPTRS); 588 break; 589 case XFS_DINODE_FMT_BTREE: 590 /* 591 * If we have a data btree then keep forkoff if we have one, 592 * otherwise we are adding a new attr, so then we set 593 * minforkoff to where the btree root can finish so we have 594 * plenty of room for attrs 595 */ 596 if (dp->i_forkoff) { 597 if (offset < dp->i_forkoff) 598 return 0; 599 return dp->i_forkoff; 600 } 601 dsize = XFS_BMAP_BROOT_SPACE(mp, dp->i_df.if_broot); 602 break; 603 } 604 605 /* 606 * A data fork btree root must have space for at least 607 * MINDBTPTRS key/ptr pairs if the data fork is small or empty. 608 */ 609 minforkoff = max_t(int64_t, dsize, XFS_BMDR_SPACE_CALC(MINDBTPTRS)); 610 minforkoff = roundup(minforkoff, 8) >> 3; 611 612 /* attr fork btree root can have at least this many key/ptr pairs */ 613 maxforkoff = XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(MINABTPTRS); 614 maxforkoff = maxforkoff >> 3; /* rounded down */ 615 616 if (offset >= maxforkoff) 617 return maxforkoff; 618 if (offset >= minforkoff) 619 return offset; 620 return 0; 621 } 622 623 /* 624 * Switch on the ATTR2 superblock bit (implies also FEATURES2) unless: 625 * - noattr2 mount option is set, 626 * - on-disk version bit says it is already set, or 627 * - the attr2 mount option is not set to enable automatic upgrade from attr1. 628 */ 629 STATIC void 630 xfs_sbversion_add_attr2( 631 struct xfs_mount *mp, 632 struct xfs_trans *tp) 633 { 634 if (xfs_has_noattr2(mp)) 635 return; 636 if (mp->m_sb.sb_features2 & XFS_SB_VERSION2_ATTR2BIT) 637 return; 638 if (!xfs_has_attr2(mp)) 639 return; 640 641 spin_lock(&mp->m_sb_lock); 642 xfs_add_attr2(mp); 643 spin_unlock(&mp->m_sb_lock); 644 xfs_log_sb(tp); 645 } 646 647 /* 648 * Create the initial contents of a shortform attribute list. 649 */ 650 void 651 xfs_attr_shortform_create( 652 struct xfs_da_args *args) 653 { 654 struct xfs_inode *dp = args->dp; 655 struct xfs_ifork *ifp = dp->i_afp; 656 struct xfs_attr_sf_hdr *hdr; 657 658 trace_xfs_attr_sf_create(args); 659 660 ASSERT(ifp->if_bytes == 0); 661 if (ifp->if_format == XFS_DINODE_FMT_EXTENTS) 662 ifp->if_format = XFS_DINODE_FMT_LOCAL; 663 xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK); 664 hdr = (struct xfs_attr_sf_hdr *)ifp->if_u1.if_data; 665 memset(hdr, 0, sizeof(*hdr)); 666 hdr->totsize = cpu_to_be16(sizeof(*hdr)); 667 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA); 668 } 669 670 /* 671 * Return -EEXIST if attr is found, or -ENOATTR if not 672 * args: args containing attribute name and namelen 673 * sfep: If not null, pointer will be set to the last attr entry found on 674 -EEXIST. On -ENOATTR pointer is left at the last entry in the list 675 * basep: If not null, pointer is set to the byte offset of the entry in the 676 * list on -EEXIST. On -ENOATTR, pointer is left at the byte offset of 677 * the last entry in the list 678 */ 679 int 680 xfs_attr_sf_findname( 681 struct xfs_da_args *args, 682 struct xfs_attr_sf_entry **sfep, 683 unsigned int *basep) 684 { 685 struct xfs_attr_shortform *sf; 686 struct xfs_attr_sf_entry *sfe; 687 unsigned int base = sizeof(struct xfs_attr_sf_hdr); 688 int size = 0; 689 int end; 690 int i; 691 692 sf = (struct xfs_attr_shortform *)args->dp->i_afp->if_u1.if_data; 693 sfe = &sf->list[0]; 694 end = sf->hdr.count; 695 for (i = 0; i < end; sfe = xfs_attr_sf_nextentry(sfe), 696 base += size, i++) { 697 size = xfs_attr_sf_entsize(sfe); 698 if (!xfs_attr_match(args, sfe->namelen, sfe->nameval, 699 sfe->flags)) 700 continue; 701 break; 702 } 703 704 if (sfep != NULL) 705 *sfep = sfe; 706 707 if (basep != NULL) 708 *basep = base; 709 710 if (i == end) 711 return -ENOATTR; 712 return -EEXIST; 713 } 714 715 /* 716 * Add a name/value pair to the shortform attribute list. 717 * Overflow from the inode has already been checked for. 718 */ 719 void 720 xfs_attr_shortform_add( 721 struct xfs_da_args *args, 722 int forkoff) 723 { 724 struct xfs_attr_shortform *sf; 725 struct xfs_attr_sf_entry *sfe; 726 int offset, size; 727 struct xfs_mount *mp; 728 struct xfs_inode *dp; 729 struct xfs_ifork *ifp; 730 731 trace_xfs_attr_sf_add(args); 732 733 dp = args->dp; 734 mp = dp->i_mount; 735 dp->i_forkoff = forkoff; 736 737 ifp = dp->i_afp; 738 ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL); 739 sf = (struct xfs_attr_shortform *)ifp->if_u1.if_data; 740 if (xfs_attr_sf_findname(args, &sfe, NULL) == -EEXIST) 741 ASSERT(0); 742 743 offset = (char *)sfe - (char *)sf; 744 size = xfs_attr_sf_entsize_byname(args->namelen, args->valuelen); 745 xfs_idata_realloc(dp, size, XFS_ATTR_FORK); 746 sf = (struct xfs_attr_shortform *)ifp->if_u1.if_data; 747 sfe = (struct xfs_attr_sf_entry *)((char *)sf + offset); 748 749 sfe->namelen = args->namelen; 750 sfe->valuelen = args->valuelen; 751 sfe->flags = args->attr_filter; 752 memcpy(sfe->nameval, args->name, args->namelen); 753 memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen); 754 sf->hdr.count++; 755 be16_add_cpu(&sf->hdr.totsize, size); 756 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA); 757 758 xfs_sbversion_add_attr2(mp, args->trans); 759 } 760 761 /* 762 * After the last attribute is removed revert to original inode format, 763 * making all literal area available to the data fork once more. 764 */ 765 void 766 xfs_attr_fork_remove( 767 struct xfs_inode *ip, 768 struct xfs_trans *tp) 769 { 770 ASSERT(ip->i_afp->if_nextents == 0); 771 772 xfs_idestroy_fork(ip->i_afp); 773 kmem_cache_free(xfs_ifork_zone, ip->i_afp); 774 ip->i_afp = NULL; 775 ip->i_forkoff = 0; 776 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 777 } 778 779 /* 780 * Remove an attribute from the shortform attribute list structure. 781 */ 782 int 783 xfs_attr_sf_removename( 784 struct xfs_da_args *args) 785 { 786 struct xfs_attr_shortform *sf; 787 struct xfs_attr_sf_entry *sfe; 788 int size = 0, end, totsize; 789 unsigned int base; 790 struct xfs_mount *mp; 791 struct xfs_inode *dp; 792 int error; 793 794 trace_xfs_attr_sf_remove(args); 795 796 dp = args->dp; 797 mp = dp->i_mount; 798 sf = (struct xfs_attr_shortform *)dp->i_afp->if_u1.if_data; 799 800 error = xfs_attr_sf_findname(args, &sfe, &base); 801 if (error != -EEXIST) 802 return error; 803 size = xfs_attr_sf_entsize(sfe); 804 805 /* 806 * Fix up the attribute fork data, covering the hole 807 */ 808 end = base + size; 809 totsize = be16_to_cpu(sf->hdr.totsize); 810 if (end != totsize) 811 memmove(&((char *)sf)[base], &((char *)sf)[end], totsize - end); 812 sf->hdr.count--; 813 be16_add_cpu(&sf->hdr.totsize, -size); 814 815 /* 816 * Fix up the start offset of the attribute fork 817 */ 818 totsize -= size; 819 if (totsize == sizeof(xfs_attr_sf_hdr_t) && xfs_has_attr2(mp) && 820 (dp->i_df.if_format != XFS_DINODE_FMT_BTREE) && 821 !(args->op_flags & XFS_DA_OP_ADDNAME)) { 822 xfs_attr_fork_remove(dp, args->trans); 823 } else { 824 xfs_idata_realloc(dp, -size, XFS_ATTR_FORK); 825 dp->i_forkoff = xfs_attr_shortform_bytesfit(dp, totsize); 826 ASSERT(dp->i_forkoff); 827 ASSERT(totsize > sizeof(xfs_attr_sf_hdr_t) || 828 (args->op_flags & XFS_DA_OP_ADDNAME) || 829 !xfs_has_attr2(mp) || 830 dp->i_df.if_format == XFS_DINODE_FMT_BTREE); 831 xfs_trans_log_inode(args->trans, dp, 832 XFS_ILOG_CORE | XFS_ILOG_ADATA); 833 } 834 835 xfs_sbversion_add_attr2(mp, args->trans); 836 837 return 0; 838 } 839 840 /* 841 * Look up a name in a shortform attribute list structure. 842 */ 843 /*ARGSUSED*/ 844 int 845 xfs_attr_shortform_lookup(xfs_da_args_t *args) 846 { 847 struct xfs_attr_shortform *sf; 848 struct xfs_attr_sf_entry *sfe; 849 int i; 850 struct xfs_ifork *ifp; 851 852 trace_xfs_attr_sf_lookup(args); 853 854 ifp = args->dp->i_afp; 855 ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL); 856 sf = (struct xfs_attr_shortform *)ifp->if_u1.if_data; 857 sfe = &sf->list[0]; 858 for (i = 0; i < sf->hdr.count; 859 sfe = xfs_attr_sf_nextentry(sfe), i++) { 860 if (xfs_attr_match(args, sfe->namelen, sfe->nameval, 861 sfe->flags)) 862 return -EEXIST; 863 } 864 return -ENOATTR; 865 } 866 867 /* 868 * Retrieve the attribute value and length. 869 * 870 * If args->valuelen is zero, only the length needs to be returned. Unlike a 871 * lookup, we only return an error if the attribute does not exist or we can't 872 * retrieve the value. 873 */ 874 int 875 xfs_attr_shortform_getvalue( 876 struct xfs_da_args *args) 877 { 878 struct xfs_attr_shortform *sf; 879 struct xfs_attr_sf_entry *sfe; 880 int i; 881 882 ASSERT(args->dp->i_afp->if_format == XFS_DINODE_FMT_LOCAL); 883 sf = (struct xfs_attr_shortform *)args->dp->i_afp->if_u1.if_data; 884 sfe = &sf->list[0]; 885 for (i = 0; i < sf->hdr.count; 886 sfe = xfs_attr_sf_nextentry(sfe), i++) { 887 if (xfs_attr_match(args, sfe->namelen, sfe->nameval, 888 sfe->flags)) 889 return xfs_attr_copy_value(args, 890 &sfe->nameval[args->namelen], sfe->valuelen); 891 } 892 return -ENOATTR; 893 } 894 895 /* 896 * Convert from using the shortform to the leaf. On success, return the 897 * buffer so that we can keep it locked until we're totally done with it. 898 */ 899 int 900 xfs_attr_shortform_to_leaf( 901 struct xfs_da_args *args, 902 struct xfs_buf **leaf_bp) 903 { 904 struct xfs_inode *dp; 905 struct xfs_attr_shortform *sf; 906 struct xfs_attr_sf_entry *sfe; 907 struct xfs_da_args nargs; 908 char *tmpbuffer; 909 int error, i, size; 910 xfs_dablk_t blkno; 911 struct xfs_buf *bp; 912 struct xfs_ifork *ifp; 913 914 trace_xfs_attr_sf_to_leaf(args); 915 916 dp = args->dp; 917 ifp = dp->i_afp; 918 sf = (struct xfs_attr_shortform *)ifp->if_u1.if_data; 919 size = be16_to_cpu(sf->hdr.totsize); 920 tmpbuffer = kmem_alloc(size, 0); 921 ASSERT(tmpbuffer != NULL); 922 memcpy(tmpbuffer, ifp->if_u1.if_data, size); 923 sf = (struct xfs_attr_shortform *)tmpbuffer; 924 925 xfs_idata_realloc(dp, -size, XFS_ATTR_FORK); 926 xfs_bmap_local_to_extents_empty(args->trans, dp, XFS_ATTR_FORK); 927 928 bp = NULL; 929 error = xfs_da_grow_inode(args, &blkno); 930 if (error) 931 goto out; 932 933 ASSERT(blkno == 0); 934 error = xfs_attr3_leaf_create(args, blkno, &bp); 935 if (error) 936 goto out; 937 938 memset((char *)&nargs, 0, sizeof(nargs)); 939 nargs.dp = dp; 940 nargs.geo = args->geo; 941 nargs.total = args->total; 942 nargs.whichfork = XFS_ATTR_FORK; 943 nargs.trans = args->trans; 944 nargs.op_flags = XFS_DA_OP_OKNOENT; 945 946 sfe = &sf->list[0]; 947 for (i = 0; i < sf->hdr.count; i++) { 948 nargs.name = sfe->nameval; 949 nargs.namelen = sfe->namelen; 950 nargs.value = &sfe->nameval[nargs.namelen]; 951 nargs.valuelen = sfe->valuelen; 952 nargs.hashval = xfs_da_hashname(sfe->nameval, 953 sfe->namelen); 954 nargs.attr_filter = sfe->flags & XFS_ATTR_NSP_ONDISK_MASK; 955 error = xfs_attr3_leaf_lookup_int(bp, &nargs); /* set a->index */ 956 ASSERT(error == -ENOATTR); 957 error = xfs_attr3_leaf_add(bp, &nargs); 958 ASSERT(error != -ENOSPC); 959 if (error) 960 goto out; 961 sfe = xfs_attr_sf_nextentry(sfe); 962 } 963 error = 0; 964 *leaf_bp = bp; 965 out: 966 kmem_free(tmpbuffer); 967 return error; 968 } 969 970 /* 971 * Check a leaf attribute block to see if all the entries would fit into 972 * a shortform attribute list. 973 */ 974 int 975 xfs_attr_shortform_allfit( 976 struct xfs_buf *bp, 977 struct xfs_inode *dp) 978 { 979 struct xfs_attr_leafblock *leaf; 980 struct xfs_attr_leaf_entry *entry; 981 xfs_attr_leaf_name_local_t *name_loc; 982 struct xfs_attr3_icleaf_hdr leafhdr; 983 int bytes; 984 int i; 985 struct xfs_mount *mp = bp->b_mount; 986 987 leaf = bp->b_addr; 988 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf); 989 entry = xfs_attr3_leaf_entryp(leaf); 990 991 bytes = sizeof(struct xfs_attr_sf_hdr); 992 for (i = 0; i < leafhdr.count; entry++, i++) { 993 if (entry->flags & XFS_ATTR_INCOMPLETE) 994 continue; /* don't copy partial entries */ 995 if (!(entry->flags & XFS_ATTR_LOCAL)) 996 return 0; 997 name_loc = xfs_attr3_leaf_name_local(leaf, i); 998 if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX) 999 return 0; 1000 if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX) 1001 return 0; 1002 bytes += xfs_attr_sf_entsize_byname(name_loc->namelen, 1003 be16_to_cpu(name_loc->valuelen)); 1004 } 1005 if (xfs_has_attr2(dp->i_mount) && 1006 (dp->i_df.if_format != XFS_DINODE_FMT_BTREE) && 1007 (bytes == sizeof(struct xfs_attr_sf_hdr))) 1008 return -1; 1009 return xfs_attr_shortform_bytesfit(dp, bytes); 1010 } 1011 1012 /* Verify the consistency of an inline attribute fork. */ 1013 xfs_failaddr_t 1014 xfs_attr_shortform_verify( 1015 struct xfs_inode *ip) 1016 { 1017 struct xfs_attr_shortform *sfp; 1018 struct xfs_attr_sf_entry *sfep; 1019 struct xfs_attr_sf_entry *next_sfep; 1020 char *endp; 1021 struct xfs_ifork *ifp; 1022 int i; 1023 int64_t size; 1024 1025 ASSERT(ip->i_afp->if_format == XFS_DINODE_FMT_LOCAL); 1026 ifp = XFS_IFORK_PTR(ip, XFS_ATTR_FORK); 1027 sfp = (struct xfs_attr_shortform *)ifp->if_u1.if_data; 1028 size = ifp->if_bytes; 1029 1030 /* 1031 * Give up if the attribute is way too short. 1032 */ 1033 if (size < sizeof(struct xfs_attr_sf_hdr)) 1034 return __this_address; 1035 1036 endp = (char *)sfp + size; 1037 1038 /* Check all reported entries */ 1039 sfep = &sfp->list[0]; 1040 for (i = 0; i < sfp->hdr.count; i++) { 1041 /* 1042 * struct xfs_attr_sf_entry has a variable length. 1043 * Check the fixed-offset parts of the structure are 1044 * within the data buffer. 1045 * xfs_attr_sf_entry is defined with a 1-byte variable 1046 * array at the end, so we must subtract that off. 1047 */ 1048 if (((char *)sfep + sizeof(*sfep)) >= endp) 1049 return __this_address; 1050 1051 /* Don't allow names with known bad length. */ 1052 if (sfep->namelen == 0) 1053 return __this_address; 1054 1055 /* 1056 * Check that the variable-length part of the structure is 1057 * within the data buffer. The next entry starts after the 1058 * name component, so nextentry is an acceptable test. 1059 */ 1060 next_sfep = xfs_attr_sf_nextentry(sfep); 1061 if ((char *)next_sfep > endp) 1062 return __this_address; 1063 1064 /* 1065 * Check for unknown flags. Short form doesn't support 1066 * the incomplete or local bits, so we can use the namespace 1067 * mask here. 1068 */ 1069 if (sfep->flags & ~XFS_ATTR_NSP_ONDISK_MASK) 1070 return __this_address; 1071 1072 /* 1073 * Check for invalid namespace combinations. We only allow 1074 * one namespace flag per xattr, so we can just count the 1075 * bits (i.e. hweight) here. 1076 */ 1077 if (hweight8(sfep->flags & XFS_ATTR_NSP_ONDISK_MASK) > 1) 1078 return __this_address; 1079 1080 sfep = next_sfep; 1081 } 1082 if ((void *)sfep != (void *)endp) 1083 return __this_address; 1084 1085 return NULL; 1086 } 1087 1088 /* 1089 * Convert a leaf attribute list to shortform attribute list 1090 */ 1091 int 1092 xfs_attr3_leaf_to_shortform( 1093 struct xfs_buf *bp, 1094 struct xfs_da_args *args, 1095 int forkoff) 1096 { 1097 struct xfs_attr_leafblock *leaf; 1098 struct xfs_attr3_icleaf_hdr ichdr; 1099 struct xfs_attr_leaf_entry *entry; 1100 struct xfs_attr_leaf_name_local *name_loc; 1101 struct xfs_da_args nargs; 1102 struct xfs_inode *dp = args->dp; 1103 char *tmpbuffer; 1104 int error; 1105 int i; 1106 1107 trace_xfs_attr_leaf_to_sf(args); 1108 1109 tmpbuffer = kmem_alloc(args->geo->blksize, 0); 1110 if (!tmpbuffer) 1111 return -ENOMEM; 1112 1113 memcpy(tmpbuffer, bp->b_addr, args->geo->blksize); 1114 1115 leaf = (xfs_attr_leafblock_t *)tmpbuffer; 1116 xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf); 1117 entry = xfs_attr3_leaf_entryp(leaf); 1118 1119 /* XXX (dgc): buffer is about to be marked stale - why zero it? */ 1120 memset(bp->b_addr, 0, args->geo->blksize); 1121 1122 /* 1123 * Clean out the prior contents of the attribute list. 1124 */ 1125 error = xfs_da_shrink_inode(args, 0, bp); 1126 if (error) 1127 goto out; 1128 1129 if (forkoff == -1) { 1130 ASSERT(xfs_has_attr2(dp->i_mount)); 1131 ASSERT(dp->i_df.if_format != XFS_DINODE_FMT_BTREE); 1132 xfs_attr_fork_remove(dp, args->trans); 1133 goto out; 1134 } 1135 1136 xfs_attr_shortform_create(args); 1137 1138 /* 1139 * Copy the attributes 1140 */ 1141 memset((char *)&nargs, 0, sizeof(nargs)); 1142 nargs.geo = args->geo; 1143 nargs.dp = dp; 1144 nargs.total = args->total; 1145 nargs.whichfork = XFS_ATTR_FORK; 1146 nargs.trans = args->trans; 1147 nargs.op_flags = XFS_DA_OP_OKNOENT; 1148 1149 for (i = 0; i < ichdr.count; entry++, i++) { 1150 if (entry->flags & XFS_ATTR_INCOMPLETE) 1151 continue; /* don't copy partial entries */ 1152 if (!entry->nameidx) 1153 continue; 1154 ASSERT(entry->flags & XFS_ATTR_LOCAL); 1155 name_loc = xfs_attr3_leaf_name_local(leaf, i); 1156 nargs.name = name_loc->nameval; 1157 nargs.namelen = name_loc->namelen; 1158 nargs.value = &name_loc->nameval[nargs.namelen]; 1159 nargs.valuelen = be16_to_cpu(name_loc->valuelen); 1160 nargs.hashval = be32_to_cpu(entry->hashval); 1161 nargs.attr_filter = entry->flags & XFS_ATTR_NSP_ONDISK_MASK; 1162 xfs_attr_shortform_add(&nargs, forkoff); 1163 } 1164 error = 0; 1165 1166 out: 1167 kmem_free(tmpbuffer); 1168 return error; 1169 } 1170 1171 /* 1172 * Convert from using a single leaf to a root node and a leaf. 1173 */ 1174 int 1175 xfs_attr3_leaf_to_node( 1176 struct xfs_da_args *args) 1177 { 1178 struct xfs_attr_leafblock *leaf; 1179 struct xfs_attr3_icleaf_hdr icleafhdr; 1180 struct xfs_attr_leaf_entry *entries; 1181 struct xfs_da3_icnode_hdr icnodehdr; 1182 struct xfs_da_intnode *node; 1183 struct xfs_inode *dp = args->dp; 1184 struct xfs_mount *mp = dp->i_mount; 1185 struct xfs_buf *bp1 = NULL; 1186 struct xfs_buf *bp2 = NULL; 1187 xfs_dablk_t blkno; 1188 int error; 1189 1190 trace_xfs_attr_leaf_to_node(args); 1191 1192 error = xfs_da_grow_inode(args, &blkno); 1193 if (error) 1194 goto out; 1195 error = xfs_attr3_leaf_read(args->trans, dp, 0, &bp1); 1196 if (error) 1197 goto out; 1198 1199 error = xfs_da_get_buf(args->trans, dp, blkno, &bp2, XFS_ATTR_FORK); 1200 if (error) 1201 goto out; 1202 1203 /* copy leaf to new buffer, update identifiers */ 1204 xfs_trans_buf_set_type(args->trans, bp2, XFS_BLFT_ATTR_LEAF_BUF); 1205 bp2->b_ops = bp1->b_ops; 1206 memcpy(bp2->b_addr, bp1->b_addr, args->geo->blksize); 1207 if (xfs_has_crc(mp)) { 1208 struct xfs_da3_blkinfo *hdr3 = bp2->b_addr; 1209 hdr3->blkno = cpu_to_be64(xfs_buf_daddr(bp2)); 1210 } 1211 xfs_trans_log_buf(args->trans, bp2, 0, args->geo->blksize - 1); 1212 1213 /* 1214 * Set up the new root node. 1215 */ 1216 error = xfs_da3_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK); 1217 if (error) 1218 goto out; 1219 node = bp1->b_addr; 1220 xfs_da3_node_hdr_from_disk(mp, &icnodehdr, node); 1221 1222 leaf = bp2->b_addr; 1223 xfs_attr3_leaf_hdr_from_disk(args->geo, &icleafhdr, leaf); 1224 entries = xfs_attr3_leaf_entryp(leaf); 1225 1226 /* both on-disk, don't endian-flip twice */ 1227 icnodehdr.btree[0].hashval = entries[icleafhdr.count - 1].hashval; 1228 icnodehdr.btree[0].before = cpu_to_be32(blkno); 1229 icnodehdr.count = 1; 1230 xfs_da3_node_hdr_to_disk(dp->i_mount, node, &icnodehdr); 1231 xfs_trans_log_buf(args->trans, bp1, 0, args->geo->blksize - 1); 1232 error = 0; 1233 out: 1234 return error; 1235 } 1236 1237 /*======================================================================== 1238 * Routines used for growing the Btree. 1239 *========================================================================*/ 1240 1241 /* 1242 * Create the initial contents of a leaf attribute list 1243 * or a leaf in a node attribute list. 1244 */ 1245 STATIC int 1246 xfs_attr3_leaf_create( 1247 struct xfs_da_args *args, 1248 xfs_dablk_t blkno, 1249 struct xfs_buf **bpp) 1250 { 1251 struct xfs_attr_leafblock *leaf; 1252 struct xfs_attr3_icleaf_hdr ichdr; 1253 struct xfs_inode *dp = args->dp; 1254 struct xfs_mount *mp = dp->i_mount; 1255 struct xfs_buf *bp; 1256 int error; 1257 1258 trace_xfs_attr_leaf_create(args); 1259 1260 error = xfs_da_get_buf(args->trans, args->dp, blkno, &bp, 1261 XFS_ATTR_FORK); 1262 if (error) 1263 return error; 1264 bp->b_ops = &xfs_attr3_leaf_buf_ops; 1265 xfs_trans_buf_set_type(args->trans, bp, XFS_BLFT_ATTR_LEAF_BUF); 1266 leaf = bp->b_addr; 1267 memset(leaf, 0, args->geo->blksize); 1268 1269 memset(&ichdr, 0, sizeof(ichdr)); 1270 ichdr.firstused = args->geo->blksize; 1271 1272 if (xfs_has_crc(mp)) { 1273 struct xfs_da3_blkinfo *hdr3 = bp->b_addr; 1274 1275 ichdr.magic = XFS_ATTR3_LEAF_MAGIC; 1276 1277 hdr3->blkno = cpu_to_be64(xfs_buf_daddr(bp)); 1278 hdr3->owner = cpu_to_be64(dp->i_ino); 1279 uuid_copy(&hdr3->uuid, &mp->m_sb.sb_meta_uuid); 1280 1281 ichdr.freemap[0].base = sizeof(struct xfs_attr3_leaf_hdr); 1282 } else { 1283 ichdr.magic = XFS_ATTR_LEAF_MAGIC; 1284 ichdr.freemap[0].base = sizeof(struct xfs_attr_leaf_hdr); 1285 } 1286 ichdr.freemap[0].size = ichdr.firstused - ichdr.freemap[0].base; 1287 1288 xfs_attr3_leaf_hdr_to_disk(args->geo, leaf, &ichdr); 1289 xfs_trans_log_buf(args->trans, bp, 0, args->geo->blksize - 1); 1290 1291 *bpp = bp; 1292 return 0; 1293 } 1294 1295 /* 1296 * Split the leaf node, rebalance, then add the new entry. 1297 */ 1298 int 1299 xfs_attr3_leaf_split( 1300 struct xfs_da_state *state, 1301 struct xfs_da_state_blk *oldblk, 1302 struct xfs_da_state_blk *newblk) 1303 { 1304 xfs_dablk_t blkno; 1305 int error; 1306 1307 trace_xfs_attr_leaf_split(state->args); 1308 1309 /* 1310 * Allocate space for a new leaf node. 1311 */ 1312 ASSERT(oldblk->magic == XFS_ATTR_LEAF_MAGIC); 1313 error = xfs_da_grow_inode(state->args, &blkno); 1314 if (error) 1315 return error; 1316 error = xfs_attr3_leaf_create(state->args, blkno, &newblk->bp); 1317 if (error) 1318 return error; 1319 newblk->blkno = blkno; 1320 newblk->magic = XFS_ATTR_LEAF_MAGIC; 1321 1322 /* 1323 * Rebalance the entries across the two leaves. 1324 * NOTE: rebalance() currently depends on the 2nd block being empty. 1325 */ 1326 xfs_attr3_leaf_rebalance(state, oldblk, newblk); 1327 error = xfs_da3_blk_link(state, oldblk, newblk); 1328 if (error) 1329 return error; 1330 1331 /* 1332 * Save info on "old" attribute for "atomic rename" ops, leaf_add() 1333 * modifies the index/blkno/rmtblk/rmtblkcnt fields to show the 1334 * "new" attrs info. Will need the "old" info to remove it later. 1335 * 1336 * Insert the "new" entry in the correct block. 1337 */ 1338 if (state->inleaf) { 1339 trace_xfs_attr_leaf_add_old(state->args); 1340 error = xfs_attr3_leaf_add(oldblk->bp, state->args); 1341 } else { 1342 trace_xfs_attr_leaf_add_new(state->args); 1343 error = xfs_attr3_leaf_add(newblk->bp, state->args); 1344 } 1345 1346 /* 1347 * Update last hashval in each block since we added the name. 1348 */ 1349 oldblk->hashval = xfs_attr_leaf_lasthash(oldblk->bp, NULL); 1350 newblk->hashval = xfs_attr_leaf_lasthash(newblk->bp, NULL); 1351 return error; 1352 } 1353 1354 /* 1355 * Add a name to the leaf attribute list structure. 1356 */ 1357 int 1358 xfs_attr3_leaf_add( 1359 struct xfs_buf *bp, 1360 struct xfs_da_args *args) 1361 { 1362 struct xfs_attr_leafblock *leaf; 1363 struct xfs_attr3_icleaf_hdr ichdr; 1364 int tablesize; 1365 int entsize; 1366 int sum; 1367 int tmp; 1368 int i; 1369 1370 trace_xfs_attr_leaf_add(args); 1371 1372 leaf = bp->b_addr; 1373 xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf); 1374 ASSERT(args->index >= 0 && args->index <= ichdr.count); 1375 entsize = xfs_attr_leaf_newentsize(args, NULL); 1376 1377 /* 1378 * Search through freemap for first-fit on new name length. 1379 * (may need to figure in size of entry struct too) 1380 */ 1381 tablesize = (ichdr.count + 1) * sizeof(xfs_attr_leaf_entry_t) 1382 + xfs_attr3_leaf_hdr_size(leaf); 1383 for (sum = 0, i = XFS_ATTR_LEAF_MAPSIZE - 1; i >= 0; i--) { 1384 if (tablesize > ichdr.firstused) { 1385 sum += ichdr.freemap[i].size; 1386 continue; 1387 } 1388 if (!ichdr.freemap[i].size) 1389 continue; /* no space in this map */ 1390 tmp = entsize; 1391 if (ichdr.freemap[i].base < ichdr.firstused) 1392 tmp += sizeof(xfs_attr_leaf_entry_t); 1393 if (ichdr.freemap[i].size >= tmp) { 1394 tmp = xfs_attr3_leaf_add_work(bp, &ichdr, args, i); 1395 goto out_log_hdr; 1396 } 1397 sum += ichdr.freemap[i].size; 1398 } 1399 1400 /* 1401 * If there are no holes in the address space of the block, 1402 * and we don't have enough freespace, then compaction will do us 1403 * no good and we should just give up. 1404 */ 1405 if (!ichdr.holes && sum < entsize) 1406 return -ENOSPC; 1407 1408 /* 1409 * Compact the entries to coalesce free space. 1410 * This may change the hdr->count via dropping INCOMPLETE entries. 1411 */ 1412 xfs_attr3_leaf_compact(args, &ichdr, bp); 1413 1414 /* 1415 * After compaction, the block is guaranteed to have only one 1416 * free region, in freemap[0]. If it is not big enough, give up. 1417 */ 1418 if (ichdr.freemap[0].size < (entsize + sizeof(xfs_attr_leaf_entry_t))) { 1419 tmp = -ENOSPC; 1420 goto out_log_hdr; 1421 } 1422 1423 tmp = xfs_attr3_leaf_add_work(bp, &ichdr, args, 0); 1424 1425 out_log_hdr: 1426 xfs_attr3_leaf_hdr_to_disk(args->geo, leaf, &ichdr); 1427 xfs_trans_log_buf(args->trans, bp, 1428 XFS_DA_LOGRANGE(leaf, &leaf->hdr, 1429 xfs_attr3_leaf_hdr_size(leaf))); 1430 return tmp; 1431 } 1432 1433 /* 1434 * Add a name to a leaf attribute list structure. 1435 */ 1436 STATIC int 1437 xfs_attr3_leaf_add_work( 1438 struct xfs_buf *bp, 1439 struct xfs_attr3_icleaf_hdr *ichdr, 1440 struct xfs_da_args *args, 1441 int mapindex) 1442 { 1443 struct xfs_attr_leafblock *leaf; 1444 struct xfs_attr_leaf_entry *entry; 1445 struct xfs_attr_leaf_name_local *name_loc; 1446 struct xfs_attr_leaf_name_remote *name_rmt; 1447 struct xfs_mount *mp; 1448 int tmp; 1449 int i; 1450 1451 trace_xfs_attr_leaf_add_work(args); 1452 1453 leaf = bp->b_addr; 1454 ASSERT(mapindex >= 0 && mapindex < XFS_ATTR_LEAF_MAPSIZE); 1455 ASSERT(args->index >= 0 && args->index <= ichdr->count); 1456 1457 /* 1458 * Force open some space in the entry array and fill it in. 1459 */ 1460 entry = &xfs_attr3_leaf_entryp(leaf)[args->index]; 1461 if (args->index < ichdr->count) { 1462 tmp = ichdr->count - args->index; 1463 tmp *= sizeof(xfs_attr_leaf_entry_t); 1464 memmove(entry + 1, entry, tmp); 1465 xfs_trans_log_buf(args->trans, bp, 1466 XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry))); 1467 } 1468 ichdr->count++; 1469 1470 /* 1471 * Allocate space for the new string (at the end of the run). 1472 */ 1473 mp = args->trans->t_mountp; 1474 ASSERT(ichdr->freemap[mapindex].base < args->geo->blksize); 1475 ASSERT((ichdr->freemap[mapindex].base & 0x3) == 0); 1476 ASSERT(ichdr->freemap[mapindex].size >= 1477 xfs_attr_leaf_newentsize(args, NULL)); 1478 ASSERT(ichdr->freemap[mapindex].size < args->geo->blksize); 1479 ASSERT((ichdr->freemap[mapindex].size & 0x3) == 0); 1480 1481 ichdr->freemap[mapindex].size -= xfs_attr_leaf_newentsize(args, &tmp); 1482 1483 entry->nameidx = cpu_to_be16(ichdr->freemap[mapindex].base + 1484 ichdr->freemap[mapindex].size); 1485 entry->hashval = cpu_to_be32(args->hashval); 1486 entry->flags = args->attr_filter; 1487 if (tmp) 1488 entry->flags |= XFS_ATTR_LOCAL; 1489 if (args->op_flags & XFS_DA_OP_RENAME) { 1490 entry->flags |= XFS_ATTR_INCOMPLETE; 1491 if ((args->blkno2 == args->blkno) && 1492 (args->index2 <= args->index)) { 1493 args->index2++; 1494 } 1495 } 1496 xfs_trans_log_buf(args->trans, bp, 1497 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); 1498 ASSERT((args->index == 0) || 1499 (be32_to_cpu(entry->hashval) >= be32_to_cpu((entry-1)->hashval))); 1500 ASSERT((args->index == ichdr->count - 1) || 1501 (be32_to_cpu(entry->hashval) <= be32_to_cpu((entry+1)->hashval))); 1502 1503 /* 1504 * For "remote" attribute values, simply note that we need to 1505 * allocate space for the "remote" value. We can't actually 1506 * allocate the extents in this transaction, and we can't decide 1507 * which blocks they should be as we might allocate more blocks 1508 * as part of this transaction (a split operation for example). 1509 */ 1510 if (entry->flags & XFS_ATTR_LOCAL) { 1511 name_loc = xfs_attr3_leaf_name_local(leaf, args->index); 1512 name_loc->namelen = args->namelen; 1513 name_loc->valuelen = cpu_to_be16(args->valuelen); 1514 memcpy((char *)name_loc->nameval, args->name, args->namelen); 1515 memcpy((char *)&name_loc->nameval[args->namelen], args->value, 1516 be16_to_cpu(name_loc->valuelen)); 1517 } else { 1518 name_rmt = xfs_attr3_leaf_name_remote(leaf, args->index); 1519 name_rmt->namelen = args->namelen; 1520 memcpy((char *)name_rmt->name, args->name, args->namelen); 1521 entry->flags |= XFS_ATTR_INCOMPLETE; 1522 /* just in case */ 1523 name_rmt->valuelen = 0; 1524 name_rmt->valueblk = 0; 1525 args->rmtblkno = 1; 1526 args->rmtblkcnt = xfs_attr3_rmt_blocks(mp, args->valuelen); 1527 args->rmtvaluelen = args->valuelen; 1528 } 1529 xfs_trans_log_buf(args->trans, bp, 1530 XFS_DA_LOGRANGE(leaf, xfs_attr3_leaf_name(leaf, args->index), 1531 xfs_attr_leaf_entsize(leaf, args->index))); 1532 1533 /* 1534 * Update the control info for this leaf node 1535 */ 1536 if (be16_to_cpu(entry->nameidx) < ichdr->firstused) 1537 ichdr->firstused = be16_to_cpu(entry->nameidx); 1538 1539 ASSERT(ichdr->firstused >= ichdr->count * sizeof(xfs_attr_leaf_entry_t) 1540 + xfs_attr3_leaf_hdr_size(leaf)); 1541 tmp = (ichdr->count - 1) * sizeof(xfs_attr_leaf_entry_t) 1542 + xfs_attr3_leaf_hdr_size(leaf); 1543 1544 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) { 1545 if (ichdr->freemap[i].base == tmp) { 1546 ichdr->freemap[i].base += sizeof(xfs_attr_leaf_entry_t); 1547 ichdr->freemap[i].size -= 1548 min_t(uint16_t, ichdr->freemap[i].size, 1549 sizeof(xfs_attr_leaf_entry_t)); 1550 } 1551 } 1552 ichdr->usedbytes += xfs_attr_leaf_entsize(leaf, args->index); 1553 return 0; 1554 } 1555 1556 /* 1557 * Garbage collect a leaf attribute list block by copying it to a new buffer. 1558 */ 1559 STATIC void 1560 xfs_attr3_leaf_compact( 1561 struct xfs_da_args *args, 1562 struct xfs_attr3_icleaf_hdr *ichdr_dst, 1563 struct xfs_buf *bp) 1564 { 1565 struct xfs_attr_leafblock *leaf_src; 1566 struct xfs_attr_leafblock *leaf_dst; 1567 struct xfs_attr3_icleaf_hdr ichdr_src; 1568 struct xfs_trans *trans = args->trans; 1569 char *tmpbuffer; 1570 1571 trace_xfs_attr_leaf_compact(args); 1572 1573 tmpbuffer = kmem_alloc(args->geo->blksize, 0); 1574 memcpy(tmpbuffer, bp->b_addr, args->geo->blksize); 1575 memset(bp->b_addr, 0, args->geo->blksize); 1576 leaf_src = (xfs_attr_leafblock_t *)tmpbuffer; 1577 leaf_dst = bp->b_addr; 1578 1579 /* 1580 * Copy the on-disk header back into the destination buffer to ensure 1581 * all the information in the header that is not part of the incore 1582 * header structure is preserved. 1583 */ 1584 memcpy(bp->b_addr, tmpbuffer, xfs_attr3_leaf_hdr_size(leaf_src)); 1585 1586 /* Initialise the incore headers */ 1587 ichdr_src = *ichdr_dst; /* struct copy */ 1588 ichdr_dst->firstused = args->geo->blksize; 1589 ichdr_dst->usedbytes = 0; 1590 ichdr_dst->count = 0; 1591 ichdr_dst->holes = 0; 1592 ichdr_dst->freemap[0].base = xfs_attr3_leaf_hdr_size(leaf_src); 1593 ichdr_dst->freemap[0].size = ichdr_dst->firstused - 1594 ichdr_dst->freemap[0].base; 1595 1596 /* write the header back to initialise the underlying buffer */ 1597 xfs_attr3_leaf_hdr_to_disk(args->geo, leaf_dst, ichdr_dst); 1598 1599 /* 1600 * Copy all entry's in the same (sorted) order, 1601 * but allocate name/value pairs packed and in sequence. 1602 */ 1603 xfs_attr3_leaf_moveents(args, leaf_src, &ichdr_src, 0, 1604 leaf_dst, ichdr_dst, 0, ichdr_src.count); 1605 /* 1606 * this logs the entire buffer, but the caller must write the header 1607 * back to the buffer when it is finished modifying it. 1608 */ 1609 xfs_trans_log_buf(trans, bp, 0, args->geo->blksize - 1); 1610 1611 kmem_free(tmpbuffer); 1612 } 1613 1614 /* 1615 * Compare two leaf blocks "order". 1616 * Return 0 unless leaf2 should go before leaf1. 1617 */ 1618 static int 1619 xfs_attr3_leaf_order( 1620 struct xfs_buf *leaf1_bp, 1621 struct xfs_attr3_icleaf_hdr *leaf1hdr, 1622 struct xfs_buf *leaf2_bp, 1623 struct xfs_attr3_icleaf_hdr *leaf2hdr) 1624 { 1625 struct xfs_attr_leaf_entry *entries1; 1626 struct xfs_attr_leaf_entry *entries2; 1627 1628 entries1 = xfs_attr3_leaf_entryp(leaf1_bp->b_addr); 1629 entries2 = xfs_attr3_leaf_entryp(leaf2_bp->b_addr); 1630 if (leaf1hdr->count > 0 && leaf2hdr->count > 0 && 1631 ((be32_to_cpu(entries2[0].hashval) < 1632 be32_to_cpu(entries1[0].hashval)) || 1633 (be32_to_cpu(entries2[leaf2hdr->count - 1].hashval) < 1634 be32_to_cpu(entries1[leaf1hdr->count - 1].hashval)))) { 1635 return 1; 1636 } 1637 return 0; 1638 } 1639 1640 int 1641 xfs_attr_leaf_order( 1642 struct xfs_buf *leaf1_bp, 1643 struct xfs_buf *leaf2_bp) 1644 { 1645 struct xfs_attr3_icleaf_hdr ichdr1; 1646 struct xfs_attr3_icleaf_hdr ichdr2; 1647 struct xfs_mount *mp = leaf1_bp->b_mount; 1648 1649 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr1, leaf1_bp->b_addr); 1650 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr2, leaf2_bp->b_addr); 1651 return xfs_attr3_leaf_order(leaf1_bp, &ichdr1, leaf2_bp, &ichdr2); 1652 } 1653 1654 /* 1655 * Redistribute the attribute list entries between two leaf nodes, 1656 * taking into account the size of the new entry. 1657 * 1658 * NOTE: if new block is empty, then it will get the upper half of the 1659 * old block. At present, all (one) callers pass in an empty second block. 1660 * 1661 * This code adjusts the args->index/blkno and args->index2/blkno2 fields 1662 * to match what it is doing in splitting the attribute leaf block. Those 1663 * values are used in "atomic rename" operations on attributes. Note that 1664 * the "new" and "old" values can end up in different blocks. 1665 */ 1666 STATIC void 1667 xfs_attr3_leaf_rebalance( 1668 struct xfs_da_state *state, 1669 struct xfs_da_state_blk *blk1, 1670 struct xfs_da_state_blk *blk2) 1671 { 1672 struct xfs_da_args *args; 1673 struct xfs_attr_leafblock *leaf1; 1674 struct xfs_attr_leafblock *leaf2; 1675 struct xfs_attr3_icleaf_hdr ichdr1; 1676 struct xfs_attr3_icleaf_hdr ichdr2; 1677 struct xfs_attr_leaf_entry *entries1; 1678 struct xfs_attr_leaf_entry *entries2; 1679 int count; 1680 int totallen; 1681 int max; 1682 int space; 1683 int swap; 1684 1685 /* 1686 * Set up environment. 1687 */ 1688 ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC); 1689 ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC); 1690 leaf1 = blk1->bp->b_addr; 1691 leaf2 = blk2->bp->b_addr; 1692 xfs_attr3_leaf_hdr_from_disk(state->args->geo, &ichdr1, leaf1); 1693 xfs_attr3_leaf_hdr_from_disk(state->args->geo, &ichdr2, leaf2); 1694 ASSERT(ichdr2.count == 0); 1695 args = state->args; 1696 1697 trace_xfs_attr_leaf_rebalance(args); 1698 1699 /* 1700 * Check ordering of blocks, reverse if it makes things simpler. 1701 * 1702 * NOTE: Given that all (current) callers pass in an empty 1703 * second block, this code should never set "swap". 1704 */ 1705 swap = 0; 1706 if (xfs_attr3_leaf_order(blk1->bp, &ichdr1, blk2->bp, &ichdr2)) { 1707 swap(blk1, blk2); 1708 1709 /* swap structures rather than reconverting them */ 1710 swap(ichdr1, ichdr2); 1711 1712 leaf1 = blk1->bp->b_addr; 1713 leaf2 = blk2->bp->b_addr; 1714 swap = 1; 1715 } 1716 1717 /* 1718 * Examine entries until we reduce the absolute difference in 1719 * byte usage between the two blocks to a minimum. Then get 1720 * the direction to copy and the number of elements to move. 1721 * 1722 * "inleaf" is true if the new entry should be inserted into blk1. 1723 * If "swap" is also true, then reverse the sense of "inleaf". 1724 */ 1725 state->inleaf = xfs_attr3_leaf_figure_balance(state, blk1, &ichdr1, 1726 blk2, &ichdr2, 1727 &count, &totallen); 1728 if (swap) 1729 state->inleaf = !state->inleaf; 1730 1731 /* 1732 * Move any entries required from leaf to leaf: 1733 */ 1734 if (count < ichdr1.count) { 1735 /* 1736 * Figure the total bytes to be added to the destination leaf. 1737 */ 1738 /* number entries being moved */ 1739 count = ichdr1.count - count; 1740 space = ichdr1.usedbytes - totallen; 1741 space += count * sizeof(xfs_attr_leaf_entry_t); 1742 1743 /* 1744 * leaf2 is the destination, compact it if it looks tight. 1745 */ 1746 max = ichdr2.firstused - xfs_attr3_leaf_hdr_size(leaf1); 1747 max -= ichdr2.count * sizeof(xfs_attr_leaf_entry_t); 1748 if (space > max) 1749 xfs_attr3_leaf_compact(args, &ichdr2, blk2->bp); 1750 1751 /* 1752 * Move high entries from leaf1 to low end of leaf2. 1753 */ 1754 xfs_attr3_leaf_moveents(args, leaf1, &ichdr1, 1755 ichdr1.count - count, leaf2, &ichdr2, 0, count); 1756 1757 } else if (count > ichdr1.count) { 1758 /* 1759 * I assert that since all callers pass in an empty 1760 * second buffer, this code should never execute. 1761 */ 1762 ASSERT(0); 1763 1764 /* 1765 * Figure the total bytes to be added to the destination leaf. 1766 */ 1767 /* number entries being moved */ 1768 count -= ichdr1.count; 1769 space = totallen - ichdr1.usedbytes; 1770 space += count * sizeof(xfs_attr_leaf_entry_t); 1771 1772 /* 1773 * leaf1 is the destination, compact it if it looks tight. 1774 */ 1775 max = ichdr1.firstused - xfs_attr3_leaf_hdr_size(leaf1); 1776 max -= ichdr1.count * sizeof(xfs_attr_leaf_entry_t); 1777 if (space > max) 1778 xfs_attr3_leaf_compact(args, &ichdr1, blk1->bp); 1779 1780 /* 1781 * Move low entries from leaf2 to high end of leaf1. 1782 */ 1783 xfs_attr3_leaf_moveents(args, leaf2, &ichdr2, 0, leaf1, &ichdr1, 1784 ichdr1.count, count); 1785 } 1786 1787 xfs_attr3_leaf_hdr_to_disk(state->args->geo, leaf1, &ichdr1); 1788 xfs_attr3_leaf_hdr_to_disk(state->args->geo, leaf2, &ichdr2); 1789 xfs_trans_log_buf(args->trans, blk1->bp, 0, args->geo->blksize - 1); 1790 xfs_trans_log_buf(args->trans, blk2->bp, 0, args->geo->blksize - 1); 1791 1792 /* 1793 * Copy out last hashval in each block for B-tree code. 1794 */ 1795 entries1 = xfs_attr3_leaf_entryp(leaf1); 1796 entries2 = xfs_attr3_leaf_entryp(leaf2); 1797 blk1->hashval = be32_to_cpu(entries1[ichdr1.count - 1].hashval); 1798 blk2->hashval = be32_to_cpu(entries2[ichdr2.count - 1].hashval); 1799 1800 /* 1801 * Adjust the expected index for insertion. 1802 * NOTE: this code depends on the (current) situation that the 1803 * second block was originally empty. 1804 * 1805 * If the insertion point moved to the 2nd block, we must adjust 1806 * the index. We must also track the entry just following the 1807 * new entry for use in an "atomic rename" operation, that entry 1808 * is always the "old" entry and the "new" entry is what we are 1809 * inserting. The index/blkno fields refer to the "old" entry, 1810 * while the index2/blkno2 fields refer to the "new" entry. 1811 */ 1812 if (blk1->index > ichdr1.count) { 1813 ASSERT(state->inleaf == 0); 1814 blk2->index = blk1->index - ichdr1.count; 1815 args->index = args->index2 = blk2->index; 1816 args->blkno = args->blkno2 = blk2->blkno; 1817 } else if (blk1->index == ichdr1.count) { 1818 if (state->inleaf) { 1819 args->index = blk1->index; 1820 args->blkno = blk1->blkno; 1821 args->index2 = 0; 1822 args->blkno2 = blk2->blkno; 1823 } else { 1824 /* 1825 * On a double leaf split, the original attr location 1826 * is already stored in blkno2/index2, so don't 1827 * overwrite it overwise we corrupt the tree. 1828 */ 1829 blk2->index = blk1->index - ichdr1.count; 1830 args->index = blk2->index; 1831 args->blkno = blk2->blkno; 1832 if (!state->extravalid) { 1833 /* 1834 * set the new attr location to match the old 1835 * one and let the higher level split code 1836 * decide where in the leaf to place it. 1837 */ 1838 args->index2 = blk2->index; 1839 args->blkno2 = blk2->blkno; 1840 } 1841 } 1842 } else { 1843 ASSERT(state->inleaf == 1); 1844 args->index = args->index2 = blk1->index; 1845 args->blkno = args->blkno2 = blk1->blkno; 1846 } 1847 } 1848 1849 /* 1850 * Examine entries until we reduce the absolute difference in 1851 * byte usage between the two blocks to a minimum. 1852 * GROT: Is this really necessary? With other than a 512 byte blocksize, 1853 * GROT: there will always be enough room in either block for a new entry. 1854 * GROT: Do a double-split for this case? 1855 */ 1856 STATIC int 1857 xfs_attr3_leaf_figure_balance( 1858 struct xfs_da_state *state, 1859 struct xfs_da_state_blk *blk1, 1860 struct xfs_attr3_icleaf_hdr *ichdr1, 1861 struct xfs_da_state_blk *blk2, 1862 struct xfs_attr3_icleaf_hdr *ichdr2, 1863 int *countarg, 1864 int *usedbytesarg) 1865 { 1866 struct xfs_attr_leafblock *leaf1 = blk1->bp->b_addr; 1867 struct xfs_attr_leafblock *leaf2 = blk2->bp->b_addr; 1868 struct xfs_attr_leaf_entry *entry; 1869 int count; 1870 int max; 1871 int index; 1872 int totallen = 0; 1873 int half; 1874 int lastdelta; 1875 int foundit = 0; 1876 int tmp; 1877 1878 /* 1879 * Examine entries until we reduce the absolute difference in 1880 * byte usage between the two blocks to a minimum. 1881 */ 1882 max = ichdr1->count + ichdr2->count; 1883 half = (max + 1) * sizeof(*entry); 1884 half += ichdr1->usedbytes + ichdr2->usedbytes + 1885 xfs_attr_leaf_newentsize(state->args, NULL); 1886 half /= 2; 1887 lastdelta = state->args->geo->blksize; 1888 entry = xfs_attr3_leaf_entryp(leaf1); 1889 for (count = index = 0; count < max; entry++, index++, count++) { 1890 1891 #define XFS_ATTR_ABS(A) (((A) < 0) ? -(A) : (A)) 1892 /* 1893 * The new entry is in the first block, account for it. 1894 */ 1895 if (count == blk1->index) { 1896 tmp = totallen + sizeof(*entry) + 1897 xfs_attr_leaf_newentsize(state->args, NULL); 1898 if (XFS_ATTR_ABS(half - tmp) > lastdelta) 1899 break; 1900 lastdelta = XFS_ATTR_ABS(half - tmp); 1901 totallen = tmp; 1902 foundit = 1; 1903 } 1904 1905 /* 1906 * Wrap around into the second block if necessary. 1907 */ 1908 if (count == ichdr1->count) { 1909 leaf1 = leaf2; 1910 entry = xfs_attr3_leaf_entryp(leaf1); 1911 index = 0; 1912 } 1913 1914 /* 1915 * Figure out if next leaf entry would be too much. 1916 */ 1917 tmp = totallen + sizeof(*entry) + xfs_attr_leaf_entsize(leaf1, 1918 index); 1919 if (XFS_ATTR_ABS(half - tmp) > lastdelta) 1920 break; 1921 lastdelta = XFS_ATTR_ABS(half - tmp); 1922 totallen = tmp; 1923 #undef XFS_ATTR_ABS 1924 } 1925 1926 /* 1927 * Calculate the number of usedbytes that will end up in lower block. 1928 * If new entry not in lower block, fix up the count. 1929 */ 1930 totallen -= count * sizeof(*entry); 1931 if (foundit) { 1932 totallen -= sizeof(*entry) + 1933 xfs_attr_leaf_newentsize(state->args, NULL); 1934 } 1935 1936 *countarg = count; 1937 *usedbytesarg = totallen; 1938 return foundit; 1939 } 1940 1941 /*======================================================================== 1942 * Routines used for shrinking the Btree. 1943 *========================================================================*/ 1944 1945 /* 1946 * Check a leaf block and its neighbors to see if the block should be 1947 * collapsed into one or the other neighbor. Always keep the block 1948 * with the smaller block number. 1949 * If the current block is over 50% full, don't try to join it, return 0. 1950 * If the block is empty, fill in the state structure and return 2. 1951 * If it can be collapsed, fill in the state structure and return 1. 1952 * If nothing can be done, return 0. 1953 * 1954 * GROT: allow for INCOMPLETE entries in calculation. 1955 */ 1956 int 1957 xfs_attr3_leaf_toosmall( 1958 struct xfs_da_state *state, 1959 int *action) 1960 { 1961 struct xfs_attr_leafblock *leaf; 1962 struct xfs_da_state_blk *blk; 1963 struct xfs_attr3_icleaf_hdr ichdr; 1964 struct xfs_buf *bp; 1965 xfs_dablk_t blkno; 1966 int bytes; 1967 int forward; 1968 int error; 1969 int retval; 1970 int i; 1971 1972 trace_xfs_attr_leaf_toosmall(state->args); 1973 1974 /* 1975 * Check for the degenerate case of the block being over 50% full. 1976 * If so, it's not worth even looking to see if we might be able 1977 * to coalesce with a sibling. 1978 */ 1979 blk = &state->path.blk[ state->path.active-1 ]; 1980 leaf = blk->bp->b_addr; 1981 xfs_attr3_leaf_hdr_from_disk(state->args->geo, &ichdr, leaf); 1982 bytes = xfs_attr3_leaf_hdr_size(leaf) + 1983 ichdr.count * sizeof(xfs_attr_leaf_entry_t) + 1984 ichdr.usedbytes; 1985 if (bytes > (state->args->geo->blksize >> 1)) { 1986 *action = 0; /* blk over 50%, don't try to join */ 1987 return 0; 1988 } 1989 1990 /* 1991 * Check for the degenerate case of the block being empty. 1992 * If the block is empty, we'll simply delete it, no need to 1993 * coalesce it with a sibling block. We choose (arbitrarily) 1994 * to merge with the forward block unless it is NULL. 1995 */ 1996 if (ichdr.count == 0) { 1997 /* 1998 * Make altpath point to the block we want to keep and 1999 * path point to the block we want to drop (this one). 2000 */ 2001 forward = (ichdr.forw != 0); 2002 memcpy(&state->altpath, &state->path, sizeof(state->path)); 2003 error = xfs_da3_path_shift(state, &state->altpath, forward, 2004 0, &retval); 2005 if (error) 2006 return error; 2007 if (retval) { 2008 *action = 0; 2009 } else { 2010 *action = 2; 2011 } 2012 return 0; 2013 } 2014 2015 /* 2016 * Examine each sibling block to see if we can coalesce with 2017 * at least 25% free space to spare. We need to figure out 2018 * whether to merge with the forward or the backward block. 2019 * We prefer coalescing with the lower numbered sibling so as 2020 * to shrink an attribute list over time. 2021 */ 2022 /* start with smaller blk num */ 2023 forward = ichdr.forw < ichdr.back; 2024 for (i = 0; i < 2; forward = !forward, i++) { 2025 struct xfs_attr3_icleaf_hdr ichdr2; 2026 if (forward) 2027 blkno = ichdr.forw; 2028 else 2029 blkno = ichdr.back; 2030 if (blkno == 0) 2031 continue; 2032 error = xfs_attr3_leaf_read(state->args->trans, state->args->dp, 2033 blkno, &bp); 2034 if (error) 2035 return error; 2036 2037 xfs_attr3_leaf_hdr_from_disk(state->args->geo, &ichdr2, bp->b_addr); 2038 2039 bytes = state->args->geo->blksize - 2040 (state->args->geo->blksize >> 2) - 2041 ichdr.usedbytes - ichdr2.usedbytes - 2042 ((ichdr.count + ichdr2.count) * 2043 sizeof(xfs_attr_leaf_entry_t)) - 2044 xfs_attr3_leaf_hdr_size(leaf); 2045 2046 xfs_trans_brelse(state->args->trans, bp); 2047 if (bytes >= 0) 2048 break; /* fits with at least 25% to spare */ 2049 } 2050 if (i >= 2) { 2051 *action = 0; 2052 return 0; 2053 } 2054 2055 /* 2056 * Make altpath point to the block we want to keep (the lower 2057 * numbered block) and path point to the block we want to drop. 2058 */ 2059 memcpy(&state->altpath, &state->path, sizeof(state->path)); 2060 if (blkno < blk->blkno) { 2061 error = xfs_da3_path_shift(state, &state->altpath, forward, 2062 0, &retval); 2063 } else { 2064 error = xfs_da3_path_shift(state, &state->path, forward, 2065 0, &retval); 2066 } 2067 if (error) 2068 return error; 2069 if (retval) { 2070 *action = 0; 2071 } else { 2072 *action = 1; 2073 } 2074 return 0; 2075 } 2076 2077 /* 2078 * Remove a name from the leaf attribute list structure. 2079 * 2080 * Return 1 if leaf is less than 37% full, 0 if >= 37% full. 2081 * If two leaves are 37% full, when combined they will leave 25% free. 2082 */ 2083 int 2084 xfs_attr3_leaf_remove( 2085 struct xfs_buf *bp, 2086 struct xfs_da_args *args) 2087 { 2088 struct xfs_attr_leafblock *leaf; 2089 struct xfs_attr3_icleaf_hdr ichdr; 2090 struct xfs_attr_leaf_entry *entry; 2091 int before; 2092 int after; 2093 int smallest; 2094 int entsize; 2095 int tablesize; 2096 int tmp; 2097 int i; 2098 2099 trace_xfs_attr_leaf_remove(args); 2100 2101 leaf = bp->b_addr; 2102 xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf); 2103 2104 ASSERT(ichdr.count > 0 && ichdr.count < args->geo->blksize / 8); 2105 ASSERT(args->index >= 0 && args->index < ichdr.count); 2106 ASSERT(ichdr.firstused >= ichdr.count * sizeof(*entry) + 2107 xfs_attr3_leaf_hdr_size(leaf)); 2108 2109 entry = &xfs_attr3_leaf_entryp(leaf)[args->index]; 2110 2111 ASSERT(be16_to_cpu(entry->nameidx) >= ichdr.firstused); 2112 ASSERT(be16_to_cpu(entry->nameidx) < args->geo->blksize); 2113 2114 /* 2115 * Scan through free region table: 2116 * check for adjacency of free'd entry with an existing one, 2117 * find smallest free region in case we need to replace it, 2118 * adjust any map that borders the entry table, 2119 */ 2120 tablesize = ichdr.count * sizeof(xfs_attr_leaf_entry_t) 2121 + xfs_attr3_leaf_hdr_size(leaf); 2122 tmp = ichdr.freemap[0].size; 2123 before = after = -1; 2124 smallest = XFS_ATTR_LEAF_MAPSIZE - 1; 2125 entsize = xfs_attr_leaf_entsize(leaf, args->index); 2126 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) { 2127 ASSERT(ichdr.freemap[i].base < args->geo->blksize); 2128 ASSERT(ichdr.freemap[i].size < args->geo->blksize); 2129 if (ichdr.freemap[i].base == tablesize) { 2130 ichdr.freemap[i].base -= sizeof(xfs_attr_leaf_entry_t); 2131 ichdr.freemap[i].size += sizeof(xfs_attr_leaf_entry_t); 2132 } 2133 2134 if (ichdr.freemap[i].base + ichdr.freemap[i].size == 2135 be16_to_cpu(entry->nameidx)) { 2136 before = i; 2137 } else if (ichdr.freemap[i].base == 2138 (be16_to_cpu(entry->nameidx) + entsize)) { 2139 after = i; 2140 } else if (ichdr.freemap[i].size < tmp) { 2141 tmp = ichdr.freemap[i].size; 2142 smallest = i; 2143 } 2144 } 2145 2146 /* 2147 * Coalesce adjacent freemap regions, 2148 * or replace the smallest region. 2149 */ 2150 if ((before >= 0) || (after >= 0)) { 2151 if ((before >= 0) && (after >= 0)) { 2152 ichdr.freemap[before].size += entsize; 2153 ichdr.freemap[before].size += ichdr.freemap[after].size; 2154 ichdr.freemap[after].base = 0; 2155 ichdr.freemap[after].size = 0; 2156 } else if (before >= 0) { 2157 ichdr.freemap[before].size += entsize; 2158 } else { 2159 ichdr.freemap[after].base = be16_to_cpu(entry->nameidx); 2160 ichdr.freemap[after].size += entsize; 2161 } 2162 } else { 2163 /* 2164 * Replace smallest region (if it is smaller than free'd entry) 2165 */ 2166 if (ichdr.freemap[smallest].size < entsize) { 2167 ichdr.freemap[smallest].base = be16_to_cpu(entry->nameidx); 2168 ichdr.freemap[smallest].size = entsize; 2169 } 2170 } 2171 2172 /* 2173 * Did we remove the first entry? 2174 */ 2175 if (be16_to_cpu(entry->nameidx) == ichdr.firstused) 2176 smallest = 1; 2177 else 2178 smallest = 0; 2179 2180 /* 2181 * Compress the remaining entries and zero out the removed stuff. 2182 */ 2183 memset(xfs_attr3_leaf_name(leaf, args->index), 0, entsize); 2184 ichdr.usedbytes -= entsize; 2185 xfs_trans_log_buf(args->trans, bp, 2186 XFS_DA_LOGRANGE(leaf, xfs_attr3_leaf_name(leaf, args->index), 2187 entsize)); 2188 2189 tmp = (ichdr.count - args->index) * sizeof(xfs_attr_leaf_entry_t); 2190 memmove(entry, entry + 1, tmp); 2191 ichdr.count--; 2192 xfs_trans_log_buf(args->trans, bp, 2193 XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(xfs_attr_leaf_entry_t))); 2194 2195 entry = &xfs_attr3_leaf_entryp(leaf)[ichdr.count]; 2196 memset(entry, 0, sizeof(xfs_attr_leaf_entry_t)); 2197 2198 /* 2199 * If we removed the first entry, re-find the first used byte 2200 * in the name area. Note that if the entry was the "firstused", 2201 * then we don't have a "hole" in our block resulting from 2202 * removing the name. 2203 */ 2204 if (smallest) { 2205 tmp = args->geo->blksize; 2206 entry = xfs_attr3_leaf_entryp(leaf); 2207 for (i = ichdr.count - 1; i >= 0; entry++, i--) { 2208 ASSERT(be16_to_cpu(entry->nameidx) >= ichdr.firstused); 2209 ASSERT(be16_to_cpu(entry->nameidx) < args->geo->blksize); 2210 2211 if (be16_to_cpu(entry->nameidx) < tmp) 2212 tmp = be16_to_cpu(entry->nameidx); 2213 } 2214 ichdr.firstused = tmp; 2215 ASSERT(ichdr.firstused != 0); 2216 } else { 2217 ichdr.holes = 1; /* mark as needing compaction */ 2218 } 2219 xfs_attr3_leaf_hdr_to_disk(args->geo, leaf, &ichdr); 2220 xfs_trans_log_buf(args->trans, bp, 2221 XFS_DA_LOGRANGE(leaf, &leaf->hdr, 2222 xfs_attr3_leaf_hdr_size(leaf))); 2223 2224 /* 2225 * Check if leaf is less than 50% full, caller may want to 2226 * "join" the leaf with a sibling if so. 2227 */ 2228 tmp = ichdr.usedbytes + xfs_attr3_leaf_hdr_size(leaf) + 2229 ichdr.count * sizeof(xfs_attr_leaf_entry_t); 2230 2231 return tmp < args->geo->magicpct; /* leaf is < 37% full */ 2232 } 2233 2234 /* 2235 * Move all the attribute list entries from drop_leaf into save_leaf. 2236 */ 2237 void 2238 xfs_attr3_leaf_unbalance( 2239 struct xfs_da_state *state, 2240 struct xfs_da_state_blk *drop_blk, 2241 struct xfs_da_state_blk *save_blk) 2242 { 2243 struct xfs_attr_leafblock *drop_leaf = drop_blk->bp->b_addr; 2244 struct xfs_attr_leafblock *save_leaf = save_blk->bp->b_addr; 2245 struct xfs_attr3_icleaf_hdr drophdr; 2246 struct xfs_attr3_icleaf_hdr savehdr; 2247 struct xfs_attr_leaf_entry *entry; 2248 2249 trace_xfs_attr_leaf_unbalance(state->args); 2250 2251 drop_leaf = drop_blk->bp->b_addr; 2252 save_leaf = save_blk->bp->b_addr; 2253 xfs_attr3_leaf_hdr_from_disk(state->args->geo, &drophdr, drop_leaf); 2254 xfs_attr3_leaf_hdr_from_disk(state->args->geo, &savehdr, save_leaf); 2255 entry = xfs_attr3_leaf_entryp(drop_leaf); 2256 2257 /* 2258 * Save last hashval from dying block for later Btree fixup. 2259 */ 2260 drop_blk->hashval = be32_to_cpu(entry[drophdr.count - 1].hashval); 2261 2262 /* 2263 * Check if we need a temp buffer, or can we do it in place. 2264 * Note that we don't check "leaf" for holes because we will 2265 * always be dropping it, toosmall() decided that for us already. 2266 */ 2267 if (savehdr.holes == 0) { 2268 /* 2269 * dest leaf has no holes, so we add there. May need 2270 * to make some room in the entry array. 2271 */ 2272 if (xfs_attr3_leaf_order(save_blk->bp, &savehdr, 2273 drop_blk->bp, &drophdr)) { 2274 xfs_attr3_leaf_moveents(state->args, 2275 drop_leaf, &drophdr, 0, 2276 save_leaf, &savehdr, 0, 2277 drophdr.count); 2278 } else { 2279 xfs_attr3_leaf_moveents(state->args, 2280 drop_leaf, &drophdr, 0, 2281 save_leaf, &savehdr, 2282 savehdr.count, drophdr.count); 2283 } 2284 } else { 2285 /* 2286 * Destination has holes, so we make a temporary copy 2287 * of the leaf and add them both to that. 2288 */ 2289 struct xfs_attr_leafblock *tmp_leaf; 2290 struct xfs_attr3_icleaf_hdr tmphdr; 2291 2292 tmp_leaf = kmem_zalloc(state->args->geo->blksize, 0); 2293 2294 /* 2295 * Copy the header into the temp leaf so that all the stuff 2296 * not in the incore header is present and gets copied back in 2297 * once we've moved all the entries. 2298 */ 2299 memcpy(tmp_leaf, save_leaf, xfs_attr3_leaf_hdr_size(save_leaf)); 2300 2301 memset(&tmphdr, 0, sizeof(tmphdr)); 2302 tmphdr.magic = savehdr.magic; 2303 tmphdr.forw = savehdr.forw; 2304 tmphdr.back = savehdr.back; 2305 tmphdr.firstused = state->args->geo->blksize; 2306 2307 /* write the header to the temp buffer to initialise it */ 2308 xfs_attr3_leaf_hdr_to_disk(state->args->geo, tmp_leaf, &tmphdr); 2309 2310 if (xfs_attr3_leaf_order(save_blk->bp, &savehdr, 2311 drop_blk->bp, &drophdr)) { 2312 xfs_attr3_leaf_moveents(state->args, 2313 drop_leaf, &drophdr, 0, 2314 tmp_leaf, &tmphdr, 0, 2315 drophdr.count); 2316 xfs_attr3_leaf_moveents(state->args, 2317 save_leaf, &savehdr, 0, 2318 tmp_leaf, &tmphdr, tmphdr.count, 2319 savehdr.count); 2320 } else { 2321 xfs_attr3_leaf_moveents(state->args, 2322 save_leaf, &savehdr, 0, 2323 tmp_leaf, &tmphdr, 0, 2324 savehdr.count); 2325 xfs_attr3_leaf_moveents(state->args, 2326 drop_leaf, &drophdr, 0, 2327 tmp_leaf, &tmphdr, tmphdr.count, 2328 drophdr.count); 2329 } 2330 memcpy(save_leaf, tmp_leaf, state->args->geo->blksize); 2331 savehdr = tmphdr; /* struct copy */ 2332 kmem_free(tmp_leaf); 2333 } 2334 2335 xfs_attr3_leaf_hdr_to_disk(state->args->geo, save_leaf, &savehdr); 2336 xfs_trans_log_buf(state->args->trans, save_blk->bp, 0, 2337 state->args->geo->blksize - 1); 2338 2339 /* 2340 * Copy out last hashval in each block for B-tree code. 2341 */ 2342 entry = xfs_attr3_leaf_entryp(save_leaf); 2343 save_blk->hashval = be32_to_cpu(entry[savehdr.count - 1].hashval); 2344 } 2345 2346 /*======================================================================== 2347 * Routines used for finding things in the Btree. 2348 *========================================================================*/ 2349 2350 /* 2351 * Look up a name in a leaf attribute list structure. 2352 * This is the internal routine, it uses the caller's buffer. 2353 * 2354 * Note that duplicate keys are allowed, but only check within the 2355 * current leaf node. The Btree code must check in adjacent leaf nodes. 2356 * 2357 * Return in args->index the index into the entry[] array of either 2358 * the found entry, or where the entry should have been (insert before 2359 * that entry). 2360 * 2361 * Don't change the args->value unless we find the attribute. 2362 */ 2363 int 2364 xfs_attr3_leaf_lookup_int( 2365 struct xfs_buf *bp, 2366 struct xfs_da_args *args) 2367 { 2368 struct xfs_attr_leafblock *leaf; 2369 struct xfs_attr3_icleaf_hdr ichdr; 2370 struct xfs_attr_leaf_entry *entry; 2371 struct xfs_attr_leaf_entry *entries; 2372 struct xfs_attr_leaf_name_local *name_loc; 2373 struct xfs_attr_leaf_name_remote *name_rmt; 2374 xfs_dahash_t hashval; 2375 int probe; 2376 int span; 2377 2378 trace_xfs_attr_leaf_lookup(args); 2379 2380 leaf = bp->b_addr; 2381 xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf); 2382 entries = xfs_attr3_leaf_entryp(leaf); 2383 if (ichdr.count >= args->geo->blksize / 8) { 2384 xfs_buf_mark_corrupt(bp); 2385 return -EFSCORRUPTED; 2386 } 2387 2388 /* 2389 * Binary search. (note: small blocks will skip this loop) 2390 */ 2391 hashval = args->hashval; 2392 probe = span = ichdr.count / 2; 2393 for (entry = &entries[probe]; span > 4; entry = &entries[probe]) { 2394 span /= 2; 2395 if (be32_to_cpu(entry->hashval) < hashval) 2396 probe += span; 2397 else if (be32_to_cpu(entry->hashval) > hashval) 2398 probe -= span; 2399 else 2400 break; 2401 } 2402 if (!(probe >= 0 && (!ichdr.count || probe < ichdr.count))) { 2403 xfs_buf_mark_corrupt(bp); 2404 return -EFSCORRUPTED; 2405 } 2406 if (!(span <= 4 || be32_to_cpu(entry->hashval) == hashval)) { 2407 xfs_buf_mark_corrupt(bp); 2408 return -EFSCORRUPTED; 2409 } 2410 2411 /* 2412 * Since we may have duplicate hashval's, find the first matching 2413 * hashval in the leaf. 2414 */ 2415 while (probe > 0 && be32_to_cpu(entry->hashval) >= hashval) { 2416 entry--; 2417 probe--; 2418 } 2419 while (probe < ichdr.count && 2420 be32_to_cpu(entry->hashval) < hashval) { 2421 entry++; 2422 probe++; 2423 } 2424 if (probe == ichdr.count || be32_to_cpu(entry->hashval) != hashval) { 2425 args->index = probe; 2426 return -ENOATTR; 2427 } 2428 2429 /* 2430 * Duplicate keys may be present, so search all of them for a match. 2431 */ 2432 for (; probe < ichdr.count && (be32_to_cpu(entry->hashval) == hashval); 2433 entry++, probe++) { 2434 /* 2435 * GROT: Add code to remove incomplete entries. 2436 */ 2437 if (entry->flags & XFS_ATTR_LOCAL) { 2438 name_loc = xfs_attr3_leaf_name_local(leaf, probe); 2439 if (!xfs_attr_match(args, name_loc->namelen, 2440 name_loc->nameval, entry->flags)) 2441 continue; 2442 args->index = probe; 2443 return -EEXIST; 2444 } else { 2445 name_rmt = xfs_attr3_leaf_name_remote(leaf, probe); 2446 if (!xfs_attr_match(args, name_rmt->namelen, 2447 name_rmt->name, entry->flags)) 2448 continue; 2449 args->index = probe; 2450 args->rmtvaluelen = be32_to_cpu(name_rmt->valuelen); 2451 args->rmtblkno = be32_to_cpu(name_rmt->valueblk); 2452 args->rmtblkcnt = xfs_attr3_rmt_blocks( 2453 args->dp->i_mount, 2454 args->rmtvaluelen); 2455 return -EEXIST; 2456 } 2457 } 2458 args->index = probe; 2459 return -ENOATTR; 2460 } 2461 2462 /* 2463 * Get the value associated with an attribute name from a leaf attribute 2464 * list structure. 2465 * 2466 * If args->valuelen is zero, only the length needs to be returned. Unlike a 2467 * lookup, we only return an error if the attribute does not exist or we can't 2468 * retrieve the value. 2469 */ 2470 int 2471 xfs_attr3_leaf_getvalue( 2472 struct xfs_buf *bp, 2473 struct xfs_da_args *args) 2474 { 2475 struct xfs_attr_leafblock *leaf; 2476 struct xfs_attr3_icleaf_hdr ichdr; 2477 struct xfs_attr_leaf_entry *entry; 2478 struct xfs_attr_leaf_name_local *name_loc; 2479 struct xfs_attr_leaf_name_remote *name_rmt; 2480 2481 leaf = bp->b_addr; 2482 xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf); 2483 ASSERT(ichdr.count < args->geo->blksize / 8); 2484 ASSERT(args->index < ichdr.count); 2485 2486 entry = &xfs_attr3_leaf_entryp(leaf)[args->index]; 2487 if (entry->flags & XFS_ATTR_LOCAL) { 2488 name_loc = xfs_attr3_leaf_name_local(leaf, args->index); 2489 ASSERT(name_loc->namelen == args->namelen); 2490 ASSERT(memcmp(args->name, name_loc->nameval, args->namelen) == 0); 2491 return xfs_attr_copy_value(args, 2492 &name_loc->nameval[args->namelen], 2493 be16_to_cpu(name_loc->valuelen)); 2494 } 2495 2496 name_rmt = xfs_attr3_leaf_name_remote(leaf, args->index); 2497 ASSERT(name_rmt->namelen == args->namelen); 2498 ASSERT(memcmp(args->name, name_rmt->name, args->namelen) == 0); 2499 args->rmtvaluelen = be32_to_cpu(name_rmt->valuelen); 2500 args->rmtblkno = be32_to_cpu(name_rmt->valueblk); 2501 args->rmtblkcnt = xfs_attr3_rmt_blocks(args->dp->i_mount, 2502 args->rmtvaluelen); 2503 return xfs_attr_copy_value(args, NULL, args->rmtvaluelen); 2504 } 2505 2506 /*======================================================================== 2507 * Utility routines. 2508 *========================================================================*/ 2509 2510 /* 2511 * Move the indicated entries from one leaf to another. 2512 * NOTE: this routine modifies both source and destination leaves. 2513 */ 2514 /*ARGSUSED*/ 2515 STATIC void 2516 xfs_attr3_leaf_moveents( 2517 struct xfs_da_args *args, 2518 struct xfs_attr_leafblock *leaf_s, 2519 struct xfs_attr3_icleaf_hdr *ichdr_s, 2520 int start_s, 2521 struct xfs_attr_leafblock *leaf_d, 2522 struct xfs_attr3_icleaf_hdr *ichdr_d, 2523 int start_d, 2524 int count) 2525 { 2526 struct xfs_attr_leaf_entry *entry_s; 2527 struct xfs_attr_leaf_entry *entry_d; 2528 int desti; 2529 int tmp; 2530 int i; 2531 2532 /* 2533 * Check for nothing to do. 2534 */ 2535 if (count == 0) 2536 return; 2537 2538 /* 2539 * Set up environment. 2540 */ 2541 ASSERT(ichdr_s->magic == XFS_ATTR_LEAF_MAGIC || 2542 ichdr_s->magic == XFS_ATTR3_LEAF_MAGIC); 2543 ASSERT(ichdr_s->magic == ichdr_d->magic); 2544 ASSERT(ichdr_s->count > 0 && ichdr_s->count < args->geo->blksize / 8); 2545 ASSERT(ichdr_s->firstused >= (ichdr_s->count * sizeof(*entry_s)) 2546 + xfs_attr3_leaf_hdr_size(leaf_s)); 2547 ASSERT(ichdr_d->count < args->geo->blksize / 8); 2548 ASSERT(ichdr_d->firstused >= (ichdr_d->count * sizeof(*entry_d)) 2549 + xfs_attr3_leaf_hdr_size(leaf_d)); 2550 2551 ASSERT(start_s < ichdr_s->count); 2552 ASSERT(start_d <= ichdr_d->count); 2553 ASSERT(count <= ichdr_s->count); 2554 2555 2556 /* 2557 * Move the entries in the destination leaf up to make a hole? 2558 */ 2559 if (start_d < ichdr_d->count) { 2560 tmp = ichdr_d->count - start_d; 2561 tmp *= sizeof(xfs_attr_leaf_entry_t); 2562 entry_s = &xfs_attr3_leaf_entryp(leaf_d)[start_d]; 2563 entry_d = &xfs_attr3_leaf_entryp(leaf_d)[start_d + count]; 2564 memmove(entry_d, entry_s, tmp); 2565 } 2566 2567 /* 2568 * Copy all entry's in the same (sorted) order, 2569 * but allocate attribute info packed and in sequence. 2570 */ 2571 entry_s = &xfs_attr3_leaf_entryp(leaf_s)[start_s]; 2572 entry_d = &xfs_attr3_leaf_entryp(leaf_d)[start_d]; 2573 desti = start_d; 2574 for (i = 0; i < count; entry_s++, entry_d++, desti++, i++) { 2575 ASSERT(be16_to_cpu(entry_s->nameidx) >= ichdr_s->firstused); 2576 tmp = xfs_attr_leaf_entsize(leaf_s, start_s + i); 2577 #ifdef GROT 2578 /* 2579 * Code to drop INCOMPLETE entries. Difficult to use as we 2580 * may also need to change the insertion index. Code turned 2581 * off for 6.2, should be revisited later. 2582 */ 2583 if (entry_s->flags & XFS_ATTR_INCOMPLETE) { /* skip partials? */ 2584 memset(xfs_attr3_leaf_name(leaf_s, start_s + i), 0, tmp); 2585 ichdr_s->usedbytes -= tmp; 2586 ichdr_s->count -= 1; 2587 entry_d--; /* to compensate for ++ in loop hdr */ 2588 desti--; 2589 if ((start_s + i) < offset) 2590 result++; /* insertion index adjustment */ 2591 } else { 2592 #endif /* GROT */ 2593 ichdr_d->firstused -= tmp; 2594 /* both on-disk, don't endian flip twice */ 2595 entry_d->hashval = entry_s->hashval; 2596 entry_d->nameidx = cpu_to_be16(ichdr_d->firstused); 2597 entry_d->flags = entry_s->flags; 2598 ASSERT(be16_to_cpu(entry_d->nameidx) + tmp 2599 <= args->geo->blksize); 2600 memmove(xfs_attr3_leaf_name(leaf_d, desti), 2601 xfs_attr3_leaf_name(leaf_s, start_s + i), tmp); 2602 ASSERT(be16_to_cpu(entry_s->nameidx) + tmp 2603 <= args->geo->blksize); 2604 memset(xfs_attr3_leaf_name(leaf_s, start_s + i), 0, tmp); 2605 ichdr_s->usedbytes -= tmp; 2606 ichdr_d->usedbytes += tmp; 2607 ichdr_s->count -= 1; 2608 ichdr_d->count += 1; 2609 tmp = ichdr_d->count * sizeof(xfs_attr_leaf_entry_t) 2610 + xfs_attr3_leaf_hdr_size(leaf_d); 2611 ASSERT(ichdr_d->firstused >= tmp); 2612 #ifdef GROT 2613 } 2614 #endif /* GROT */ 2615 } 2616 2617 /* 2618 * Zero out the entries we just copied. 2619 */ 2620 if (start_s == ichdr_s->count) { 2621 tmp = count * sizeof(xfs_attr_leaf_entry_t); 2622 entry_s = &xfs_attr3_leaf_entryp(leaf_s)[start_s]; 2623 ASSERT(((char *)entry_s + tmp) <= 2624 ((char *)leaf_s + args->geo->blksize)); 2625 memset(entry_s, 0, tmp); 2626 } else { 2627 /* 2628 * Move the remaining entries down to fill the hole, 2629 * then zero the entries at the top. 2630 */ 2631 tmp = (ichdr_s->count - count) * sizeof(xfs_attr_leaf_entry_t); 2632 entry_s = &xfs_attr3_leaf_entryp(leaf_s)[start_s + count]; 2633 entry_d = &xfs_attr3_leaf_entryp(leaf_s)[start_s]; 2634 memmove(entry_d, entry_s, tmp); 2635 2636 tmp = count * sizeof(xfs_attr_leaf_entry_t); 2637 entry_s = &xfs_attr3_leaf_entryp(leaf_s)[ichdr_s->count]; 2638 ASSERT(((char *)entry_s + tmp) <= 2639 ((char *)leaf_s + args->geo->blksize)); 2640 memset(entry_s, 0, tmp); 2641 } 2642 2643 /* 2644 * Fill in the freemap information 2645 */ 2646 ichdr_d->freemap[0].base = xfs_attr3_leaf_hdr_size(leaf_d); 2647 ichdr_d->freemap[0].base += ichdr_d->count * sizeof(xfs_attr_leaf_entry_t); 2648 ichdr_d->freemap[0].size = ichdr_d->firstused - ichdr_d->freemap[0].base; 2649 ichdr_d->freemap[1].base = 0; 2650 ichdr_d->freemap[2].base = 0; 2651 ichdr_d->freemap[1].size = 0; 2652 ichdr_d->freemap[2].size = 0; 2653 ichdr_s->holes = 1; /* leaf may not be compact */ 2654 } 2655 2656 /* 2657 * Pick up the last hashvalue from a leaf block. 2658 */ 2659 xfs_dahash_t 2660 xfs_attr_leaf_lasthash( 2661 struct xfs_buf *bp, 2662 int *count) 2663 { 2664 struct xfs_attr3_icleaf_hdr ichdr; 2665 struct xfs_attr_leaf_entry *entries; 2666 struct xfs_mount *mp = bp->b_mount; 2667 2668 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, bp->b_addr); 2669 entries = xfs_attr3_leaf_entryp(bp->b_addr); 2670 if (count) 2671 *count = ichdr.count; 2672 if (!ichdr.count) 2673 return 0; 2674 return be32_to_cpu(entries[ichdr.count - 1].hashval); 2675 } 2676 2677 /* 2678 * Calculate the number of bytes used to store the indicated attribute 2679 * (whether local or remote only calculate bytes in this block). 2680 */ 2681 STATIC int 2682 xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index) 2683 { 2684 struct xfs_attr_leaf_entry *entries; 2685 xfs_attr_leaf_name_local_t *name_loc; 2686 xfs_attr_leaf_name_remote_t *name_rmt; 2687 int size; 2688 2689 entries = xfs_attr3_leaf_entryp(leaf); 2690 if (entries[index].flags & XFS_ATTR_LOCAL) { 2691 name_loc = xfs_attr3_leaf_name_local(leaf, index); 2692 size = xfs_attr_leaf_entsize_local(name_loc->namelen, 2693 be16_to_cpu(name_loc->valuelen)); 2694 } else { 2695 name_rmt = xfs_attr3_leaf_name_remote(leaf, index); 2696 size = xfs_attr_leaf_entsize_remote(name_rmt->namelen); 2697 } 2698 return size; 2699 } 2700 2701 /* 2702 * Calculate the number of bytes that would be required to store the new 2703 * attribute (whether local or remote only calculate bytes in this block). 2704 * This routine decides as a side effect whether the attribute will be 2705 * a "local" or a "remote" attribute. 2706 */ 2707 int 2708 xfs_attr_leaf_newentsize( 2709 struct xfs_da_args *args, 2710 int *local) 2711 { 2712 int size; 2713 2714 size = xfs_attr_leaf_entsize_local(args->namelen, args->valuelen); 2715 if (size < xfs_attr_leaf_entsize_local_max(args->geo->blksize)) { 2716 if (local) 2717 *local = 1; 2718 return size; 2719 } 2720 if (local) 2721 *local = 0; 2722 return xfs_attr_leaf_entsize_remote(args->namelen); 2723 } 2724 2725 2726 /*======================================================================== 2727 * Manage the INCOMPLETE flag in a leaf entry 2728 *========================================================================*/ 2729 2730 /* 2731 * Clear the INCOMPLETE flag on an entry in a leaf block. 2732 */ 2733 int 2734 xfs_attr3_leaf_clearflag( 2735 struct xfs_da_args *args) 2736 { 2737 struct xfs_attr_leafblock *leaf; 2738 struct xfs_attr_leaf_entry *entry; 2739 struct xfs_attr_leaf_name_remote *name_rmt; 2740 struct xfs_buf *bp; 2741 int error; 2742 #ifdef DEBUG 2743 struct xfs_attr3_icleaf_hdr ichdr; 2744 xfs_attr_leaf_name_local_t *name_loc; 2745 int namelen; 2746 char *name; 2747 #endif /* DEBUG */ 2748 2749 trace_xfs_attr_leaf_clearflag(args); 2750 /* 2751 * Set up the operation. 2752 */ 2753 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp); 2754 if (error) 2755 return error; 2756 2757 leaf = bp->b_addr; 2758 entry = &xfs_attr3_leaf_entryp(leaf)[args->index]; 2759 ASSERT(entry->flags & XFS_ATTR_INCOMPLETE); 2760 2761 #ifdef DEBUG 2762 xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf); 2763 ASSERT(args->index < ichdr.count); 2764 ASSERT(args->index >= 0); 2765 2766 if (entry->flags & XFS_ATTR_LOCAL) { 2767 name_loc = xfs_attr3_leaf_name_local(leaf, args->index); 2768 namelen = name_loc->namelen; 2769 name = (char *)name_loc->nameval; 2770 } else { 2771 name_rmt = xfs_attr3_leaf_name_remote(leaf, args->index); 2772 namelen = name_rmt->namelen; 2773 name = (char *)name_rmt->name; 2774 } 2775 ASSERT(be32_to_cpu(entry->hashval) == args->hashval); 2776 ASSERT(namelen == args->namelen); 2777 ASSERT(memcmp(name, args->name, namelen) == 0); 2778 #endif /* DEBUG */ 2779 2780 entry->flags &= ~XFS_ATTR_INCOMPLETE; 2781 xfs_trans_log_buf(args->trans, bp, 2782 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); 2783 2784 if (args->rmtblkno) { 2785 ASSERT((entry->flags & XFS_ATTR_LOCAL) == 0); 2786 name_rmt = xfs_attr3_leaf_name_remote(leaf, args->index); 2787 name_rmt->valueblk = cpu_to_be32(args->rmtblkno); 2788 name_rmt->valuelen = cpu_to_be32(args->rmtvaluelen); 2789 xfs_trans_log_buf(args->trans, bp, 2790 XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt))); 2791 } 2792 2793 return 0; 2794 } 2795 2796 /* 2797 * Set the INCOMPLETE flag on an entry in a leaf block. 2798 */ 2799 int 2800 xfs_attr3_leaf_setflag( 2801 struct xfs_da_args *args) 2802 { 2803 struct xfs_attr_leafblock *leaf; 2804 struct xfs_attr_leaf_entry *entry; 2805 struct xfs_attr_leaf_name_remote *name_rmt; 2806 struct xfs_buf *bp; 2807 int error; 2808 #ifdef DEBUG 2809 struct xfs_attr3_icleaf_hdr ichdr; 2810 #endif 2811 2812 trace_xfs_attr_leaf_setflag(args); 2813 2814 /* 2815 * Set up the operation. 2816 */ 2817 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp); 2818 if (error) 2819 return error; 2820 2821 leaf = bp->b_addr; 2822 #ifdef DEBUG 2823 xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf); 2824 ASSERT(args->index < ichdr.count); 2825 ASSERT(args->index >= 0); 2826 #endif 2827 entry = &xfs_attr3_leaf_entryp(leaf)[args->index]; 2828 2829 ASSERT((entry->flags & XFS_ATTR_INCOMPLETE) == 0); 2830 entry->flags |= XFS_ATTR_INCOMPLETE; 2831 xfs_trans_log_buf(args->trans, bp, 2832 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); 2833 if ((entry->flags & XFS_ATTR_LOCAL) == 0) { 2834 name_rmt = xfs_attr3_leaf_name_remote(leaf, args->index); 2835 name_rmt->valueblk = 0; 2836 name_rmt->valuelen = 0; 2837 xfs_trans_log_buf(args->trans, bp, 2838 XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt))); 2839 } 2840 2841 return 0; 2842 } 2843 2844 /* 2845 * In a single transaction, clear the INCOMPLETE flag on the leaf entry 2846 * given by args->blkno/index and set the INCOMPLETE flag on the leaf 2847 * entry given by args->blkno2/index2. 2848 * 2849 * Note that they could be in different blocks, or in the same block. 2850 */ 2851 int 2852 xfs_attr3_leaf_flipflags( 2853 struct xfs_da_args *args) 2854 { 2855 struct xfs_attr_leafblock *leaf1; 2856 struct xfs_attr_leafblock *leaf2; 2857 struct xfs_attr_leaf_entry *entry1; 2858 struct xfs_attr_leaf_entry *entry2; 2859 struct xfs_attr_leaf_name_remote *name_rmt; 2860 struct xfs_buf *bp1; 2861 struct xfs_buf *bp2; 2862 int error; 2863 #ifdef DEBUG 2864 struct xfs_attr3_icleaf_hdr ichdr1; 2865 struct xfs_attr3_icleaf_hdr ichdr2; 2866 xfs_attr_leaf_name_local_t *name_loc; 2867 int namelen1, namelen2; 2868 char *name1, *name2; 2869 #endif /* DEBUG */ 2870 2871 trace_xfs_attr_leaf_flipflags(args); 2872 2873 /* 2874 * Read the block containing the "old" attr 2875 */ 2876 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp1); 2877 if (error) 2878 return error; 2879 2880 /* 2881 * Read the block containing the "new" attr, if it is different 2882 */ 2883 if (args->blkno2 != args->blkno) { 2884 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno2, 2885 &bp2); 2886 if (error) 2887 return error; 2888 } else { 2889 bp2 = bp1; 2890 } 2891 2892 leaf1 = bp1->b_addr; 2893 entry1 = &xfs_attr3_leaf_entryp(leaf1)[args->index]; 2894 2895 leaf2 = bp2->b_addr; 2896 entry2 = &xfs_attr3_leaf_entryp(leaf2)[args->index2]; 2897 2898 #ifdef DEBUG 2899 xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr1, leaf1); 2900 ASSERT(args->index < ichdr1.count); 2901 ASSERT(args->index >= 0); 2902 2903 xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr2, leaf2); 2904 ASSERT(args->index2 < ichdr2.count); 2905 ASSERT(args->index2 >= 0); 2906 2907 if (entry1->flags & XFS_ATTR_LOCAL) { 2908 name_loc = xfs_attr3_leaf_name_local(leaf1, args->index); 2909 namelen1 = name_loc->namelen; 2910 name1 = (char *)name_loc->nameval; 2911 } else { 2912 name_rmt = xfs_attr3_leaf_name_remote(leaf1, args->index); 2913 namelen1 = name_rmt->namelen; 2914 name1 = (char *)name_rmt->name; 2915 } 2916 if (entry2->flags & XFS_ATTR_LOCAL) { 2917 name_loc = xfs_attr3_leaf_name_local(leaf2, args->index2); 2918 namelen2 = name_loc->namelen; 2919 name2 = (char *)name_loc->nameval; 2920 } else { 2921 name_rmt = xfs_attr3_leaf_name_remote(leaf2, args->index2); 2922 namelen2 = name_rmt->namelen; 2923 name2 = (char *)name_rmt->name; 2924 } 2925 ASSERT(be32_to_cpu(entry1->hashval) == be32_to_cpu(entry2->hashval)); 2926 ASSERT(namelen1 == namelen2); 2927 ASSERT(memcmp(name1, name2, namelen1) == 0); 2928 #endif /* DEBUG */ 2929 2930 ASSERT(entry1->flags & XFS_ATTR_INCOMPLETE); 2931 ASSERT((entry2->flags & XFS_ATTR_INCOMPLETE) == 0); 2932 2933 entry1->flags &= ~XFS_ATTR_INCOMPLETE; 2934 xfs_trans_log_buf(args->trans, bp1, 2935 XFS_DA_LOGRANGE(leaf1, entry1, sizeof(*entry1))); 2936 if (args->rmtblkno) { 2937 ASSERT((entry1->flags & XFS_ATTR_LOCAL) == 0); 2938 name_rmt = xfs_attr3_leaf_name_remote(leaf1, args->index); 2939 name_rmt->valueblk = cpu_to_be32(args->rmtblkno); 2940 name_rmt->valuelen = cpu_to_be32(args->rmtvaluelen); 2941 xfs_trans_log_buf(args->trans, bp1, 2942 XFS_DA_LOGRANGE(leaf1, name_rmt, sizeof(*name_rmt))); 2943 } 2944 2945 entry2->flags |= XFS_ATTR_INCOMPLETE; 2946 xfs_trans_log_buf(args->trans, bp2, 2947 XFS_DA_LOGRANGE(leaf2, entry2, sizeof(*entry2))); 2948 if ((entry2->flags & XFS_ATTR_LOCAL) == 0) { 2949 name_rmt = xfs_attr3_leaf_name_remote(leaf2, args->index2); 2950 name_rmt->valueblk = 0; 2951 name_rmt->valuelen = 0; 2952 xfs_trans_log_buf(args->trans, bp2, 2953 XFS_DA_LOGRANGE(leaf2, name_rmt, sizeof(*name_rmt))); 2954 } 2955 2956 return 0; 2957 } 2958