1/* 2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18#include "xfs.h" 19#include "xfs_fs.h" 20#include "xfs_types.h" 21#include "xfs_bit.h" 22#include "xfs_log.h" 23#include "xfs_inum.h" 24#include "xfs_trans.h" 25#include "xfs_sb.h" 26#include "xfs_ag.h" 27#include "xfs_dir.h" 28#include "xfs_dir2.h" 29#include "xfs_dmapi.h" 30#include "xfs_mount.h" 31#include "xfs_da_btree.h" 32#include "xfs_bmap_btree.h" 33#include "xfs_alloc_btree.h" 34#include "xfs_dir_sf.h" 35#include "xfs_dir2_sf.h" 36#include "xfs_attr_sf.h" 37#include "xfs_dinode.h" 38#include "xfs_inode.h" 39#include "xfs_inode_item.h" 40#include "xfs_bmap.h" 41#include "xfs_dir_leaf.h" 42#include "xfs_dir2_data.h" 43#include "xfs_dir2_leaf.h" 44#include "xfs_dir2_block.h" 45#include "xfs_dir2_node.h" 46#include "xfs_dir2_trace.h" 47#include "xfs_error.h" 48 49/* 50 * Declarations for interface routines. 51 */ 52static void xfs_dir2_mount(xfs_mount_t *mp); 53static int xfs_dir2_isempty(xfs_inode_t *dp); 54static int xfs_dir2_init(xfs_trans_t *tp, xfs_inode_t *dp, 55 xfs_inode_t *pdp); 56static int xfs_dir2_createname(xfs_trans_t *tp, xfs_inode_t *dp, 57 char *name, int namelen, xfs_ino_t inum, 58 xfs_fsblock_t *first, 59 xfs_bmap_free_t *flist, xfs_extlen_t total); 60static int xfs_dir2_lookup(xfs_trans_t *tp, xfs_inode_t *dp, char *name, 61 int namelen, xfs_ino_t *inum); 62static int xfs_dir2_removename(xfs_trans_t *tp, xfs_inode_t *dp, 63 char *name, int namelen, xfs_ino_t ino, 64 xfs_fsblock_t *first, 65 xfs_bmap_free_t *flist, xfs_extlen_t total); 66static int xfs_dir2_getdents(xfs_trans_t *tp, xfs_inode_t *dp, uio_t *uio, 67 int *eofp); 68static int xfs_dir2_replace(xfs_trans_t *tp, xfs_inode_t *dp, char *name, 69 int namelen, xfs_ino_t inum, 70 xfs_fsblock_t *first, xfs_bmap_free_t *flist, 71 xfs_extlen_t total); 72static int xfs_dir2_canenter(xfs_trans_t *tp, xfs_inode_t *dp, char *name, 73 int namelen); 74static int xfs_dir2_shortform_validate_ondisk(xfs_mount_t *mp, 75 xfs_dinode_t *dip); 76 77/* 78 * Utility routine declarations. 79 */ 80static int xfs_dir2_put_dirent64_direct(xfs_dir2_put_args_t *pa); 81static int xfs_dir2_put_dirent64_uio(xfs_dir2_put_args_t *pa); 82 83/* 84 * Directory operations vector. 85 */ 86xfs_dirops_t xfsv2_dirops = { 87 .xd_mount = xfs_dir2_mount, 88 .xd_isempty = xfs_dir2_isempty, 89 .xd_init = xfs_dir2_init, 90 .xd_createname = xfs_dir2_createname, 91 .xd_lookup = xfs_dir2_lookup, 92 .xd_removename = xfs_dir2_removename, 93 .xd_getdents = xfs_dir2_getdents, 94 .xd_replace = xfs_dir2_replace, 95 .xd_canenter = xfs_dir2_canenter, 96 .xd_shortform_validate_ondisk = xfs_dir2_shortform_validate_ondisk, 97 .xd_shortform_to_single = xfs_dir2_sf_to_block, 98}; 99 100/* 101 * Interface routines. 102 */ 103 104/* 105 * Initialize directory-related fields in the mount structure. 106 */ 107static void 108xfs_dir2_mount( 109 xfs_mount_t *mp) /* filesystem mount point */ 110{ 111 mp->m_dirversion = 2; 112 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <= 113 XFS_MAX_BLOCKSIZE); 114 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog); 115 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog; 116 mp->m_dirdatablk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_DATA_FIRSTDB(mp)); 117 mp->m_dirleafblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_LEAF_FIRSTDB(mp)); 118 mp->m_dirfreeblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_FREE_FIRSTDB(mp)); 119 mp->m_attr_node_ents = 120 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) / 121 (uint)sizeof(xfs_da_node_entry_t); 122 mp->m_dir_node_ents = 123 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) / 124 (uint)sizeof(xfs_da_node_entry_t); 125 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100; 126} 127 128/* 129 * Return 1 if directory contains only "." and "..". 130 */ 131static int /* return code */ 132xfs_dir2_isempty( 133 xfs_inode_t *dp) /* incore inode structure */ 134{ 135 xfs_dir2_sf_t *sfp; /* shortform directory structure */ 136 137 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); 138 /* 139 * Might happen during shutdown. 140 */ 141 if (dp->i_d.di_size == 0) { 142 return 1; 143 } 144 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp)) 145 return 0; 146 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; 147 return !sfp->hdr.count; 148} 149 150/* 151 * Initialize a directory with its "." and ".." entries. 152 */ 153static int /* error */ 154xfs_dir2_init( 155 xfs_trans_t *tp, /* transaction pointer */ 156 xfs_inode_t *dp, /* incore directory inode */ 157 xfs_inode_t *pdp) /* incore parent directory inode */ 158{ 159 xfs_da_args_t args; /* operation arguments */ 160 int error; /* error return value */ 161 162 memset((char *)&args, 0, sizeof(args)); 163 args.dp = dp; 164 args.trans = tp; 165 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); 166 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino))) { 167 return error; 168 } 169 return xfs_dir2_sf_create(&args, pdp->i_ino); 170} 171 172/* 173 Enter a name in a directory. 174 */ 175static int /* error */ 176xfs_dir2_createname( 177 xfs_trans_t *tp, /* transaction pointer */ 178 xfs_inode_t *dp, /* incore directory inode */ 179 char *name, /* new entry name */ 180 int namelen, /* new entry name length */ 181 xfs_ino_t inum, /* new entry inode number */ 182 xfs_fsblock_t *first, /* bmap's firstblock */ 183 xfs_bmap_free_t *flist, /* bmap's freeblock list */ 184 xfs_extlen_t total) /* bmap's total block count */ 185{ 186 xfs_da_args_t args; /* operation arguments */ 187 int rval; /* return value */ 188 int v; /* type-checking value */ 189 190 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); 191 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) { 192 return rval; 193 } 194 XFS_STATS_INC(xs_dir_create); 195 /* 196 * Fill in the arg structure for this request. 197 */ 198 args.name = name; 199 args.namelen = namelen; 200 args.hashval = xfs_da_hashname(name, namelen); 201 args.inumber = inum; 202 args.dp = dp; 203 args.firstblock = first; 204 args.flist = flist; 205 args.total = total; 206 args.whichfork = XFS_DATA_FORK; 207 args.trans = tp; 208 args.justcheck = 0; 209 args.addname = args.oknoent = 1; 210 /* 211 * Decide on what work routines to call based on the inode size. 212 */ 213 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) 214 rval = xfs_dir2_sf_addname(&args); 215 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { 216 return rval; 217 } else if (v) 218 rval = xfs_dir2_block_addname(&args); 219 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { 220 return rval; 221 } else if (v) 222 rval = xfs_dir2_leaf_addname(&args); 223 else 224 rval = xfs_dir2_node_addname(&args); 225 return rval; 226} 227 228/* 229 * Lookup a name in a directory, give back the inode number. 230 */ 231static int /* error */ 232xfs_dir2_lookup( 233 xfs_trans_t *tp, /* transaction pointer */ 234 xfs_inode_t *dp, /* incore directory inode */ 235 char *name, /* lookup name */ 236 int namelen, /* lookup name length */ 237 xfs_ino_t *inum) /* out: inode number */ 238{ 239 xfs_da_args_t args; /* operation arguments */ 240 int rval; /* return value */ 241 int v; /* type-checking value */ 242 243 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); 244 XFS_STATS_INC(xs_dir_lookup); 245 246 /* 247 * Fill in the arg structure for this request. 248 */ 249 args.name = name; 250 args.namelen = namelen; 251 args.hashval = xfs_da_hashname(name, namelen); 252 args.inumber = 0; 253 args.dp = dp; 254 args.firstblock = NULL; 255 args.flist = NULL; 256 args.total = 0; 257 args.whichfork = XFS_DATA_FORK; 258 args.trans = tp; 259 args.justcheck = args.addname = 0; 260 args.oknoent = 1; 261 /* 262 * Decide on what work routines to call based on the inode size. 263 */ 264 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) 265 rval = xfs_dir2_sf_lookup(&args); 266 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { 267 return rval; 268 } else if (v) 269 rval = xfs_dir2_block_lookup(&args); 270 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { 271 return rval; 272 } else if (v) 273 rval = xfs_dir2_leaf_lookup(&args); 274 else 275 rval = xfs_dir2_node_lookup(&args); 276 if (rval == EEXIST) 277 rval = 0; 278 if (rval == 0) 279 *inum = args.inumber; 280 return rval; 281} 282 283/* 284 * Remove an entry from a directory. 285 */ 286static int /* error */ 287xfs_dir2_removename( 288 xfs_trans_t *tp, /* transaction pointer */ 289 xfs_inode_t *dp, /* incore directory inode */ 290 char *name, /* name of entry to remove */ 291 int namelen, /* name length of entry to remove */ 292 xfs_ino_t ino, /* inode number of entry to remove */ 293 xfs_fsblock_t *first, /* bmap's firstblock */ 294 xfs_bmap_free_t *flist, /* bmap's freeblock list */ 295 xfs_extlen_t total) /* bmap's total block count */ 296{ 297 xfs_da_args_t args; /* operation arguments */ 298 int rval; /* return value */ 299 int v; /* type-checking value */ 300 301 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); 302 XFS_STATS_INC(xs_dir_remove); 303 /* 304 * Fill in the arg structure for this request. 305 */ 306 args.name = name; 307 args.namelen = namelen; 308 args.hashval = xfs_da_hashname(name, namelen); 309 args.inumber = ino; 310 args.dp = dp; 311 args.firstblock = first; 312 args.flist = flist; 313 args.total = total; 314 args.whichfork = XFS_DATA_FORK; 315 args.trans = tp; 316 args.justcheck = args.addname = args.oknoent = 0; 317 /* 318 * Decide on what work routines to call based on the inode size. 319 */ 320 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) 321 rval = xfs_dir2_sf_removename(&args); 322 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { 323 return rval; 324 } else if (v) 325 rval = xfs_dir2_block_removename(&args); 326 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { 327 return rval; 328 } else if (v) 329 rval = xfs_dir2_leaf_removename(&args); 330 else 331 rval = xfs_dir2_node_removename(&args); 332 return rval; 333} 334 335/* 336 * Read a directory. 337 */ 338static int /* error */ 339xfs_dir2_getdents( 340 xfs_trans_t *tp, /* transaction pointer */ 341 xfs_inode_t *dp, /* incore directory inode */ 342 uio_t *uio, /* caller's buffer control */ 343 int *eofp) /* out: eof reached */ 344{ 345 int alignment; /* alignment required for ABI */ 346 xfs_dirent_t *dbp; /* malloc'ed buffer */ 347 xfs_dir2_put_t put; /* entry formatting routine */ 348 int rval; /* return value */ 349 int v; /* type-checking value */ 350 351 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); 352 XFS_STATS_INC(xs_dir_getdents); 353 /* 354 * If our caller has given us a single contiguous aligned memory buffer, 355 * just work directly within that buffer. If it's in user memory, 356 * lock it down first. 357 */ 358 alignment = sizeof(xfs_off_t) - 1; 359 if ((uio->uio_iovcnt == 1) && 360 (((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) && 361 ((uio->uio_iov[0].iov_len & alignment) == 0)) { 362 dbp = NULL; 363 put = xfs_dir2_put_dirent64_direct; 364 } else { 365 dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP); 366 put = xfs_dir2_put_dirent64_uio; 367 } 368 369 *eofp = 0; 370 /* 371 * Decide on what work routines to call based on the inode size. 372 */ 373 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) 374 rval = xfs_dir2_sf_getdents(dp, uio, eofp, dbp, put); 375 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { 376 ; 377 } else if (v) 378 rval = xfs_dir2_block_getdents(tp, dp, uio, eofp, dbp, put); 379 else 380 rval = xfs_dir2_leaf_getdents(tp, dp, uio, eofp, dbp, put); 381 if (dbp != NULL) 382 kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN); 383 return rval; 384} 385 386/* 387 * Replace the inode number of a directory entry. 388 */ 389static int /* error */ 390xfs_dir2_replace( 391 xfs_trans_t *tp, /* transaction pointer */ 392 xfs_inode_t *dp, /* incore directory inode */ 393 char *name, /* name of entry to replace */ 394 int namelen, /* name length of entry to replace */ 395 xfs_ino_t inum, /* new inode number */ 396 xfs_fsblock_t *first, /* bmap's firstblock */ 397 xfs_bmap_free_t *flist, /* bmap's freeblock list */ 398 xfs_extlen_t total) /* bmap's total block count */ 399{ 400 xfs_da_args_t args; /* operation arguments */ 401 int rval; /* return value */ 402 int v; /* type-checking value */ 403 404 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); 405 406 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) { 407 return rval; 408 } 409 /* 410 * Fill in the arg structure for this request. 411 */ 412 args.name = name; 413 args.namelen = namelen; 414 args.hashval = xfs_da_hashname(name, namelen); 415 args.inumber = inum; 416 args.dp = dp; 417 args.firstblock = first; 418 args.flist = flist; 419 args.total = total; 420 args.whichfork = XFS_DATA_FORK; 421 args.trans = tp; 422 args.justcheck = args.addname = args.oknoent = 0; 423 /* 424 * Decide on what work routines to call based on the inode size. 425 */ 426 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) 427 rval = xfs_dir2_sf_replace(&args); 428 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { 429 return rval; 430 } else if (v) 431 rval = xfs_dir2_block_replace(&args); 432 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { 433 return rval; 434 } else if (v) 435 rval = xfs_dir2_leaf_replace(&args); 436 else 437 rval = xfs_dir2_node_replace(&args); 438 return rval; 439} 440 441/* 442 * See if this entry can be added to the directory without allocating space. 443 */ 444static int /* error */ 445xfs_dir2_canenter( 446 xfs_trans_t *tp, /* transaction pointer */ 447 xfs_inode_t *dp, /* incore directory inode */ 448 char *name, /* name of entry to add */ 449 int namelen) /* name length of entry to add */ 450{ 451 xfs_da_args_t args; /* operation arguments */ 452 int rval; /* return value */ 453 int v; /* type-checking value */ 454 455 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); 456 /* 457 * Fill in the arg structure for this request. 458 */ 459 args.name = name; 460 args.namelen = namelen; 461 args.hashval = xfs_da_hashname(name, namelen); 462 args.inumber = 0; 463 args.dp = dp; 464 args.firstblock = NULL; 465 args.flist = NULL; 466 args.total = 0; 467 args.whichfork = XFS_DATA_FORK; 468 args.trans = tp; 469 args.justcheck = args.addname = args.oknoent = 1; 470 /* 471 * Decide on what work routines to call based on the inode size. 472 */ 473 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) 474 rval = xfs_dir2_sf_addname(&args); 475 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { 476 return rval; 477 } else if (v) 478 rval = xfs_dir2_block_addname(&args); 479 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { 480 return rval; 481 } else if (v) 482 rval = xfs_dir2_leaf_addname(&args); 483 else 484 rval = xfs_dir2_node_addname(&args); 485 return rval; 486} 487 488/* 489 * Dummy routine for shortform inode validation. 490 * Can't really do this. 491 */ 492/* ARGSUSED */ 493static int /* error */ 494xfs_dir2_shortform_validate_ondisk( 495 xfs_mount_t *mp, /* filesystem mount point */ 496 xfs_dinode_t *dip) /* ondisk inode */ 497{ 498 return 0; 499} 500 501/* 502 * Utility routines. 503 */ 504 505/* 506 * Add a block to the directory. 507 * This routine is for data and free blocks, not leaf/node blocks 508 * which are handled by xfs_da_grow_inode. 509 */ 510int /* error */ 511xfs_dir2_grow_inode( 512 xfs_da_args_t *args, /* operation arguments */ 513 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */ 514 xfs_dir2_db_t *dbp) /* out: block number added */ 515{ 516 xfs_fileoff_t bno; /* directory offset of new block */ 517 int count; /* count of filesystem blocks */ 518 xfs_inode_t *dp; /* incore directory inode */ 519 int error; /* error return value */ 520 int got; /* blocks actually mapped */ 521 int i; /* temp mapping index */ 522 xfs_bmbt_irec_t map; /* single structure for bmap */ 523 int mapi; /* mapping index */ 524 xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */ 525 xfs_mount_t *mp; /* filesystem mount point */ 526 int nmap; /* number of bmap entries */ 527 xfs_trans_t *tp; /* transaction pointer */ 528 529 xfs_dir2_trace_args_s("grow_inode", args, space); 530 dp = args->dp; 531 tp = args->trans; 532 mp = dp->i_mount; 533 /* 534 * Set lowest possible block in the space requested. 535 */ 536 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE); 537 count = mp->m_dirblkfsbs; 538 /* 539 * Find the first hole for our block. 540 */ 541 if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK))) { 542 return error; 543 } 544 nmap = 1; 545 ASSERT(args->firstblock != NULL); 546 /* 547 * Try mapping the new block contiguously (one extent). 548 */ 549 if ((error = xfs_bmapi(tp, dp, bno, count, 550 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG, 551 args->firstblock, args->total, &map, &nmap, 552 args->flist, NULL))) { 553 return error; 554 } 555 ASSERT(nmap <= 1); 556 /* 557 * Got it in 1. 558 */ 559 if (nmap == 1) { 560 mapp = ↦ 561 mapi = 1; 562 } 563 /* 564 * Didn't work and this is a multiple-fsb directory block. 565 * Try again with contiguous flag turned on. 566 */ 567 else if (nmap == 0 && count > 1) { 568 xfs_fileoff_t b; /* current file offset */ 569 570 /* 571 * Space for maximum number of mappings. 572 */ 573 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP); 574 /* 575 * Iterate until we get to the end of our block. 576 */ 577 for (b = bno, mapi = 0; b < bno + count; ) { 578 int c; /* current fsb count */ 579 580 /* 581 * Can't map more than MAX_NMAP at once. 582 */ 583 nmap = MIN(XFS_BMAP_MAX_NMAP, count); 584 c = (int)(bno + count - b); 585 if ((error = xfs_bmapi(tp, dp, b, c, 586 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA, 587 args->firstblock, args->total, 588 &mapp[mapi], &nmap, args->flist, 589 NULL))) { 590 kmem_free(mapp, sizeof(*mapp) * count); 591 return error; 592 } 593 if (nmap < 1) 594 break; 595 /* 596 * Add this bunch into our table, go to the next offset. 597 */ 598 mapi += nmap; 599 b = mapp[mapi - 1].br_startoff + 600 mapp[mapi - 1].br_blockcount; 601 } 602 } 603 /* 604 * Didn't work. 605 */ 606 else { 607 mapi = 0; 608 mapp = NULL; 609 } 610 /* 611 * See how many fsb's we got. 612 */ 613 for (i = 0, got = 0; i < mapi; i++) 614 got += mapp[i].br_blockcount; 615 /* 616 * Didn't get enough fsb's, or the first/last block's are wrong. 617 */ 618 if (got != count || mapp[0].br_startoff != bno || 619 mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount != 620 bno + count) { 621 if (mapp != &map) 622 kmem_free(mapp, sizeof(*mapp) * count); 623 return XFS_ERROR(ENOSPC); 624 } 625 /* 626 * Done with the temporary mapping table. 627 */ 628 if (mapp != &map) 629 kmem_free(mapp, sizeof(*mapp) * count); 630 *dbp = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)bno); 631 /* 632 * Update file's size if this is the data space and it grew. 633 */ 634 if (space == XFS_DIR2_DATA_SPACE) { 635 xfs_fsize_t size; /* directory file (data) size */ 636 637 size = XFS_FSB_TO_B(mp, bno + count); 638 if (size > dp->i_d.di_size) { 639 dp->i_d.di_size = size; 640 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); 641 } 642 } 643 return 0; 644} 645 646/* 647 * See if the directory is a single-block form directory. 648 */ 649int /* error */ 650xfs_dir2_isblock( 651 xfs_trans_t *tp, /* transaction pointer */ 652 xfs_inode_t *dp, /* incore directory inode */ 653 int *vp) /* out: 1 is block, 0 is not block */ 654{ 655 xfs_fileoff_t last; /* last file offset */ 656 xfs_mount_t *mp; /* filesystem mount point */ 657 int rval; /* return value */ 658 659 mp = dp->i_mount; 660 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) { 661 return rval; 662 } 663 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize; 664 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize); 665 *vp = rval; 666 return 0; 667} 668 669/* 670 * See if the directory is a single-leaf form directory. 671 */ 672int /* error */ 673xfs_dir2_isleaf( 674 xfs_trans_t *tp, /* transaction pointer */ 675 xfs_inode_t *dp, /* incore directory inode */ 676 int *vp) /* out: 1 is leaf, 0 is not leaf */ 677{ 678 xfs_fileoff_t last; /* last file offset */ 679 xfs_mount_t *mp; /* filesystem mount point */ 680 int rval; /* return value */ 681 682 mp = dp->i_mount; 683 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) { 684 return rval; 685 } 686 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog); 687 return 0; 688} 689 690/* 691 * Getdents put routine for 64-bit ABI, direct form. 692 */ 693static int /* error */ 694xfs_dir2_put_dirent64_direct( 695 xfs_dir2_put_args_t *pa) /* argument bundle */ 696{ 697 struct dirent *idbp, dtmp; /* dirent pointer */ 698 iovec_t *iovp; /* io vector */ 699 int namelen; /* entry name length */ 700 int reclen; /* entry total length */ 701 uio_t *uio; /* I/O control */ 702 703 namelen = pa->namelen; 704 705 dtmp.d_namlen = namelen; 706 dtmp.d_reclen = GENERIC_DIRSIZ(&dtmp); 707 reclen = dtmp.d_reclen; 708 709 uio = pa->uio; 710 /* 711 * Won't fit in the remaining space. 712 */ 713 if (reclen > uio->uio_resid) { 714 pa->done = 0; 715 return 0; 716 } 717 iovp = uio->uio_iov; 718 idbp = (struct dirent *)iovp->iov_base; 719 iovp->iov_base = (char *)idbp + reclen; 720 iovp->iov_len -= reclen; 721 uio->uio_resid -= reclen; 722 idbp->d_reclen = reclen; 723 idbp->d_fileno = pa->ino; 724 idbp->d_type = DT_UNKNOWN; 725 idbp->d_namlen = namelen; 726 memcpy(idbp->d_name, pa->name, namelen); 727 idbp->d_name[namelen] = '\0'; 728 pa->done = 1; 729 return 0; 730} 731 732/* 733 * Getdents put routine for 64-bit ABI, uio form. 734 */ 735static int /* error */ 736xfs_dir2_put_dirent64_uio( 737 xfs_dir2_put_args_t *pa) /* argument bundle */ 738{ 739 struct dirent *idbp, dtmp; /* dirent pointer */ 740 int namelen; /* entry name length */ 741 int reclen; /* entry total length */ 742 int rval; /* return value */ 743 uio_t *uio; /* I/O control */ 744 745 namelen = pa->namelen; 746 747 dtmp.d_namlen = namelen; 748 dtmp.d_reclen = GENERIC_DIRSIZ(&dtmp); 749 reclen = dtmp.d_reclen; 750 751 uio = pa->uio; 752 /* 753 * Won't fit in the remaining space. 754 */ 755 if (reclen > uio->uio_resid) { 756 pa->done = 0; 757 return 0; 758 } 759 idbp = &dtmp; 760 idbp->d_reclen = reclen; 761 idbp->d_fileno = pa->ino; 762 idbp->d_type = DT_UNKNOWN; 763 idbp->d_namlen = namelen; 764 memcpy(idbp->d_name, pa->name, namelen); 765 idbp->d_name[namelen] = '\0'; 766 rval = uio_read((caddr_t)idbp, reclen, uio); 767 pa->done = (rval == 0); 768 return rval; 769} 770 771/* 772 * Remove the given block from the directory. 773 * This routine is used for data and free blocks, leaf/node are done 774 * by xfs_da_shrink_inode. 775 */ 776int 777xfs_dir2_shrink_inode( 778 xfs_da_args_t *args, /* operation arguments */ 779 xfs_dir2_db_t db, /* directory block number */ 780 xfs_dabuf_t *bp) /* block's buffer */ 781{ 782 xfs_fileoff_t bno; /* directory file offset */ 783 xfs_dablk_t da; /* directory file offset */ 784 int done; /* bunmap is finished */ 785 xfs_inode_t *dp; /* incore directory inode */ 786 int error; /* error return value */ 787 xfs_mount_t *mp; /* filesystem mount point */ 788 xfs_trans_t *tp; /* transaction pointer */ 789 790 xfs_dir2_trace_args_db("shrink_inode", args, db, bp); 791 dp = args->dp; 792 mp = dp->i_mount; 793 tp = args->trans; 794 da = XFS_DIR2_DB_TO_DA(mp, db); 795 /* 796 * Unmap the fsblock(s). 797 */ 798 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs, 799 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist, 800 NULL, &done))) { 801 /* 802 * ENOSPC actually can happen if we're in a removename with 803 * no space reservation, and the resulting block removal 804 * would cause a bmap btree split or conversion from extents 805 * to btree. This can only happen for un-fragmented 806 * directory blocks, since you need to be punching out 807 * the middle of an extent. 808 * In this case we need to leave the block in the file, 809 * and not binval it. 810 * So the block has to be in a consistent empty state 811 * and appropriately logged. 812 * We don't free up the buffer, the caller can tell it 813 * hasn't happened since it got an error back. 814 */ 815 return error; 816 } 817 ASSERT(done); 818 /* 819 * Invalidate the buffer from the transaction. 820 */ 821 xfs_da_binval(tp, bp); 822 /* 823 * If it's not a data block, we're done. 824 */ 825 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp)) 826 return 0; 827 /* 828 * If the block isn't the last one in the directory, we're done. 829 */ 830 if (dp->i_d.di_size > XFS_DIR2_DB_OFF_TO_BYTE(mp, db + 1, 0)) 831 return 0; 832 bno = da; 833 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) { 834 /* 835 * This can't really happen unless there's kernel corruption. 836 */ 837 return error; 838 } 839 if (db == mp->m_dirdatablk) 840 ASSERT(bno == 0); 841 else 842 ASSERT(bno > 0); 843 /* 844 * Set the size to the new last block. 845 */ 846 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno); 847 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); 848 return 0; 849} 850 851 852