fs/xfs/xfs_dir2_sf.c

   1 /*
   2  * Copyright (c) 2000-2003,2005 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_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_da_btree.h"
  28 #include "xfs_bmap_btree.h"
  29 #include "xfs_dinode.h"
  30 #include "xfs_inode.h"
  31 #include "xfs_inode_item.h"
  32 #include "xfs_error.h"
  33 #include "xfs_dir2.h"
  34 #include "xfs_dir2_format.h"
  35 #include "xfs_dir2_priv.h"
  36 #include "xfs_trace.h"
  37
  38 /*
  39  * Prototypes for internal functions.
  40  */
  41 static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
  42                                      xfs_dir2_sf_entry_t *sfep,
  43                                      xfs_dir2_data_aoff_t offset,
  44                                      int new_isize);
  45 static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
  46                                      int new_isize);
  47 static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
  48                                     xfs_dir2_sf_entry_t **sfepp,
  49                                     xfs_dir2_data_aoff_t *offsetp);
  50 #ifdef DEBUG
  51 static void xfs_dir2_sf_check(xfs_da_args_t *args);
  52 #else
  53 #define xfs_dir2_sf_check(args)
  54 #endif /* DEBUG */
  55 #if XFS_BIG_INUMS
  56 static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
  57 static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
  58 #endif /* XFS_BIG_INUMS */
  59
  60 /*
  61  * Inode numbers in short-form directories can come in two versions,
  62  * either 4 bytes or 8 bytes wide.  These helpers deal with the
  63  * two forms transparently by looking at the headers i8count field.
  64  *
  65  * For 64-bit inode number the most significant byte must be zero.
  66  */
  67 static xfs_ino_t
  68 xfs_dir2_sf_get_ino(
  69         struct xfs_dir2_sf_hdr  *hdr,
  70         xfs_dir2_inou_t         *from)
  71 {
  72         if (hdr->i8count)
  73                 return get_unaligned_be64(&from->i8.i) & 0x00ffffffffffffffULL;
  74         else
  75                 return get_unaligned_be32(&from->i4.i);
  76 }
  77
  78 static void
  79 xfs_dir2_sf_put_ino(
  80         struct xfs_dir2_sf_hdr  *hdr,
  81         xfs_dir2_inou_t         *to,
  82         xfs_ino_t               ino)
  83 {
  84         ASSERT((ino & 0xff00000000000000ULL) == 0);
  85
  86         if (hdr->i8count)
  87                 put_unaligned_be64(ino, &to->i8.i);
  88         else
  89                 put_unaligned_be32(ino, &to->i4.i);
  90 }
  91
  92 xfs_ino_t
  93 xfs_dir2_sf_get_parent_ino(
  94         struct xfs_dir2_sf_hdr  *hdr)
  95 {
  96         return xfs_dir2_sf_get_ino(hdr, &hdr->parent);
  97 }
  98
  99 static void
 100 xfs_dir2_sf_put_parent_ino(
 101         struct xfs_dir2_sf_hdr  *hdr,
 102         xfs_ino_t               ino)
 103 {
 104         xfs_dir2_sf_put_ino(hdr, &hdr->parent, ino);
 105 }
 106
 107 /*
 108  * In short-form directory entries the inode numbers are stored at variable
 109  * offset behind the entry name.  The inode numbers may only be accessed
 110  * through the helpers below.
 111  */
 112 static xfs_dir2_inou_t *
 113 xfs_dir2_sfe_inop(
 114         struct xfs_dir2_sf_entry *sfep)
 115 {
 116         return (xfs_dir2_inou_t *)&sfep->name[sfep->namelen];
 117 }
 118
 119 xfs_ino_t
 120 xfs_dir2_sfe_get_ino(
 121         struct xfs_dir2_sf_hdr  *hdr,
 122         struct xfs_dir2_sf_entry *sfep)
 123 {
 124         return xfs_dir2_sf_get_ino(hdr, xfs_dir2_sfe_inop(sfep));
 125 }
 126
 127 static void
 128 xfs_dir2_sfe_put_ino(
 129         struct xfs_dir2_sf_hdr  *hdr,
 130         struct xfs_dir2_sf_entry *sfep,
 131         xfs_ino_t               ino)
 132 {
 133         xfs_dir2_sf_put_ino(hdr, xfs_dir2_sfe_inop(sfep), ino);
 134 }
 135
 136 /*
 137  * Given a block directory (dp/block), calculate its size as a shortform (sf)
 138  * directory and a header for the sf directory, if it will fit it the
 139  * space currently present in the inode.  If it won't fit, the output
 140  * size is too big (but not accurate).
 141  */
 142 int                                             /* size for sf form */
 143 xfs_dir2_block_sfsize(
 144         xfs_inode_t             *dp,            /* incore inode pointer */
 145         xfs_dir2_data_hdr_t     *hdr,           /* block directory data */
 146         xfs_dir2_sf_hdr_t       *sfhp)          /* output: header for sf form */
 147 {
 148         xfs_dir2_dataptr_t      addr;           /* data entry address */
 149         xfs_dir2_leaf_entry_t   *blp;           /* leaf area of the block */
 150         xfs_dir2_block_tail_t   *btp;           /* tail area of the block */
 151         int                     count;          /* shortform entry count */
 152         xfs_dir2_data_entry_t   *dep;           /* data entry in the block */
 153         int                     i;              /* block entry index */
 154         int                     i8count;        /* count of big-inode entries */
 155         int                     isdot;          /* entry is "." */
 156         int                     isdotdot;       /* entry is ".." */
 157         xfs_mount_t             *mp;            /* mount structure pointer */
 158         int                     namelen;        /* total name bytes */
 159         xfs_ino_t               parent = 0;     /* parent inode number */
 160         int                     size=0;         /* total computed size */
 161
 162         mp = dp->i_mount;
 163
 164         count = i8count = namelen = 0;
 165         btp = xfs_dir2_block_tail_p(mp, hdr);
 166         blp = xfs_dir2_block_leaf_p(btp);
 167
 168         /*
 169          * Iterate over the block's data entries by using the leaf pointers.
 170          */
 171         for (i = 0; i < be32_to_cpu(btp->count); i++) {
 172                 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
 173                         continue;
 174                 /*
 175                  * Calculate the pointer to the entry at hand.
 176                  */
 177                 dep = (xfs_dir2_data_entry_t *)
 178                       ((char *)hdr + xfs_dir2_dataptr_to_off(mp, addr));
 179                 /*
 180                  * Detect . and .., so we can special-case them.
 181                  * . is not included in sf directories.
 182                  * .. is included by just the parent inode number.
 183                  */
 184                 isdot = dep->namelen == 1 && dep->name[0] == '.';
 185                 isdotdot =
 186                         dep->namelen == 2 &&
 187                         dep->name[0] == '.' && dep->name[1] == '.';
 188 #if XFS_BIG_INUMS
 189                 if (!isdot)
 190                         i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
 191 #endif
 192                 if (!isdot && !isdotdot) {
 193                         count++;
 194                         namelen += dep->namelen;
 195                 } else if (isdotdot)
 196                         parent = be64_to_cpu(dep->inumber);
 197                 /*
 198                  * Calculate the new size, see if we should give up yet.
 199                  */
 200                 size = xfs_dir2_sf_hdr_size(i8count) +          /* header */
 201                        count +                                  /* namelen */
 202                        count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
 203                        namelen +                                /* name */
 204                        (i8count ?                               /* inumber */
 205                                 (uint)sizeof(xfs_dir2_ino8_t) * count :
 206                                 (uint)sizeof(xfs_dir2_ino4_t) * count);
 207                 if (size > XFS_IFORK_DSIZE(dp))
 208                         return size;            /* size value is a failure */
 209         }
 210         /*
 211          * Create the output header, if it worked.
 212          */
 213         sfhp->count = count;
 214         sfhp->i8count = i8count;
 215         xfs_dir2_sf_put_parent_ino(sfhp, parent);
 216         return size;
 217 }
 218
 219 /*
 220  * Convert a block format directory to shortform.
 221  * Caller has already checked that it will fit, and built us a header.
 222  */
 223 int                                             /* error */
 224 xfs_dir2_block_to_sf(
 225         xfs_da_args_t           *args,          /* operation arguments */
 226         xfs_dabuf_t             *bp,            /* block buffer */
 227         int                     size,           /* shortform directory size */
 228         xfs_dir2_sf_hdr_t       *sfhp)          /* shortform directory hdr */
 229 {
 230         xfs_dir2_data_hdr_t     *hdr;           /* block header */
 231         xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
 232         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
 233         xfs_inode_t             *dp;            /* incore directory inode */
 234         xfs_dir2_data_unused_t  *dup;           /* unused data pointer */
 235         char                    *endptr;        /* end of data entries */
 236         int                     error;          /* error return value */
 237         int                     logflags;       /* inode logging flags */
 238         xfs_mount_t             *mp;            /* filesystem mount point */
 239         char                    *ptr;           /* current data pointer */
 240         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 241         xfs_dir2_sf_hdr_t       *sfp;           /* shortform directory header */
 242
 243         trace_xfs_dir2_block_to_sf(args);
 244
 245         dp = args->dp;
 246         mp = dp->i_mount;
 247
 248         /*
 249          * Make a copy of the block data, so we can shrink the inode
 250          * and add local data.
 251          */
 252         hdr = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
 253         memcpy(hdr, bp->data, mp->m_dirblksize);
 254         logflags = XFS_ILOG_CORE;
 255         if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
 256                 ASSERT(error != ENOSPC);
 257                 goto out;
 258         }
 259
 260         /*
 261          * The buffer is now unconditionally gone, whether
 262          * xfs_dir2_shrink_inode worked or not.
 263          *
 264          * Convert the inode to local format.
 265          */
 266         dp->i_df.if_flags &= ~XFS_IFEXTENTS;
 267         dp->i_df.if_flags |= XFS_IFINLINE;
 268         dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 269         ASSERT(dp->i_df.if_bytes == 0);
 270         xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 271         logflags |= XFS_ILOG_DDATA;
 272         /*
 273          * Copy the header into the newly allocate local space.
 274          */
 275         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 276         memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
 277         dp->i_d.di_size = size;
 278         /*
 279          * Set up to loop over the block's entries.
 280          */
 281         btp = xfs_dir2_block_tail_p(mp, hdr);
 282         ptr = (char *)(hdr + 1);
 283         endptr = (char *)xfs_dir2_block_leaf_p(btp);
 284         sfep = xfs_dir2_sf_firstentry(sfp);
 285         /*
 286          * Loop over the active and unused entries.
 287          * Stop when we reach the leaf/tail portion of the block.
 288          */
 289         while (ptr < endptr) {
 290                 /*
 291                  * If it's unused, just skip over it.
 292                  */
 293                 dup = (xfs_dir2_data_unused_t *)ptr;
 294                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 295                         ptr += be16_to_cpu(dup->length);
 296                         continue;
 297                 }
 298                 dep = (xfs_dir2_data_entry_t *)ptr;
 299                 /*
 300                  * Skip .
 301                  */
 302                 if (dep->namelen == 1 && dep->name[0] == '.')
 303                         ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
 304                 /*
 305                  * Skip .., but make sure the inode number is right.
 306                  */
 307                 else if (dep->namelen == 2 &&
 308                          dep->name[0] == '.' && dep->name[1] == '.')
 309                         ASSERT(be64_to_cpu(dep->inumber) ==
 310                                xfs_dir2_sf_get_parent_ino(sfp));
 311                 /*
 312                  * Normal entry, copy it into shortform.
 313                  */
 314                 else {
 315                         sfep->namelen = dep->namelen;
 316                         xfs_dir2_sf_put_offset(sfep,
 317                                 (xfs_dir2_data_aoff_t)
 318                                 ((char *)dep - (char *)hdr));
 319                         memcpy(sfep->name, dep->name, dep->namelen);
 320                         xfs_dir2_sfe_put_ino(sfp, sfep,
 321                                              be64_to_cpu(dep->inumber));
 322
 323                         sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 324                 }
 325                 ptr += xfs_dir2_data_entsize(dep->namelen);
 326         }
 327         ASSERT((char *)sfep - (char *)sfp == size);
 328         xfs_dir2_sf_check(args);
 329 out:
 330         xfs_trans_log_inode(args->trans, dp, logflags);
 331         kmem_free(hdr);
 332         return error;
 333 }
 334
 335 /*
 336  * Add a name to a shortform directory.
 337  * There are two algorithms, "easy" and "hard" which we decide on
 338  * before changing anything.
 339  * Convert to block form if necessary, if the new entry won't fit.
 340  */
 341 int                                             /* error */
 342 xfs_dir2_sf_addname(
 343         xfs_da_args_t           *args)          /* operation arguments */
 344 {
 345         int                     add_entsize;    /* size of the new entry */
 346         xfs_inode_t             *dp;            /* incore directory inode */
 347         int                     error;          /* error return value */
 348         int                     incr_isize;     /* total change in size */
 349         int                     new_isize;      /* di_size after adding name */
 350         int                     objchange;      /* changing to 8-byte inodes */
 351         xfs_dir2_data_aoff_t    offset = 0;     /* offset for new entry */
 352         int                     old_isize;      /* di_size before adding name */
 353         int                     pick;           /* which algorithm to use */
 354         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 355         xfs_dir2_sf_entry_t     *sfep = NULL;   /* shortform entry */
 356
 357         trace_xfs_dir2_sf_addname(args);
 358
 359         ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
 360         dp = args->dp;
 361         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 362         /*
 363          * Make sure the shortform value has some of its header.
 364          */
 365         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 366                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 367                 return XFS_ERROR(EIO);
 368         }
 369         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 370         ASSERT(dp->i_df.if_u1.if_data != NULL);
 371         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 372         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 373         /*
 374          * Compute entry (and change in) size.
 375          */
 376         add_entsize = xfs_dir2_sf_entsize(sfp, args->namelen);
 377         incr_isize = add_entsize;
 378         objchange = 0;
 379 #if XFS_BIG_INUMS
 380         /*
 381          * Do we have to change to 8 byte inodes?
 382          */
 383         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
 384                 /*
 385                  * Yes, adjust the entry size and the total size.
 386                  */
 387                 add_entsize +=
 388                         (uint)sizeof(xfs_dir2_ino8_t) -
 389                         (uint)sizeof(xfs_dir2_ino4_t);
 390                 incr_isize +=
 391                         (sfp->count + 2) *
 392                         ((uint)sizeof(xfs_dir2_ino8_t) -
 393                          (uint)sizeof(xfs_dir2_ino4_t));
 394                 objchange = 1;
 395         }
 396 #endif
 397         old_isize = (int)dp->i_d.di_size;
 398         new_isize = old_isize + incr_isize;
 399         /*
 400          * Won't fit as shortform any more (due to size),
 401          * or the pick routine says it won't (due to offset values).
 402          */
 403         if (new_isize > XFS_IFORK_DSIZE(dp) ||
 404             (pick =
 405              xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
 406                 /*
 407                  * Just checking or no space reservation, it doesn't fit.
 408                  */
 409                 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
 410                         return XFS_ERROR(ENOSPC);
 411                 /*
 412                  * Convert to block form then add the name.
 413                  */
 414                 error = xfs_dir2_sf_to_block(args);
 415                 if (error)
 416                         return error;
 417                 return xfs_dir2_block_addname(args);
 418         }
 419         /*
 420          * Just checking, it fits.
 421          */
 422         if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 423                 return 0;
 424         /*
 425          * Do it the easy way - just add it at the end.
 426          */
 427         if (pick == 1)
 428                 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
 429         /*
 430          * Do it the hard way - look for a place to insert the new entry.
 431          * Convert to 8 byte inode numbers first if necessary.
 432          */
 433         else {
 434                 ASSERT(pick == 2);
 435 #if XFS_BIG_INUMS
 436                 if (objchange)
 437                         xfs_dir2_sf_toino8(args);
 438 #endif
 439                 xfs_dir2_sf_addname_hard(args, objchange, new_isize);
 440         }
 441         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 442         return 0;
 443 }
 444
 445 /*
 446  * Add the new entry the "easy" way.
 447  * This is copying the old directory and adding the new entry at the end.
 448  * Since it's sorted by "offset" we need room after the last offset
 449  * that's already there, and then room to convert to a block directory.
 450  * This is already checked by the pick routine.
 451  */
 452 static void
 453 xfs_dir2_sf_addname_easy(
 454         xfs_da_args_t           *args,          /* operation arguments */
 455         xfs_dir2_sf_entry_t     *sfep,          /* pointer to new entry */
 456         xfs_dir2_data_aoff_t    offset,         /* offset to use for new ent */
 457         int                     new_isize)      /* new directory size */
 458 {
 459         int                     byteoff;        /* byte offset in sf dir */
 460         xfs_inode_t             *dp;            /* incore directory inode */
 461         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 462
 463         dp = args->dp;
 464
 465         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 466         byteoff = (int)((char *)sfep - (char *)sfp);
 467         /*
 468          * Grow the in-inode space.
 469          */
 470         xfs_idata_realloc(dp, xfs_dir2_sf_entsize(sfp, args->namelen),
 471                 XFS_DATA_FORK);
 472         /*
 473          * Need to set up again due to realloc of the inode data.
 474          */
 475         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 476         sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
 477         /*
 478          * Fill in the new entry.
 479          */
 480         sfep->namelen = args->namelen;
 481         xfs_dir2_sf_put_offset(sfep, offset);
 482         memcpy(sfep->name, args->name, sfep->namelen);
 483         xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
 484         /*
 485          * Update the header and inode.
 486          */
 487         sfp->count++;
 488 #if XFS_BIG_INUMS
 489         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
 490                 sfp->i8count++;
 491 #endif
 492         dp->i_d.di_size = new_isize;
 493         xfs_dir2_sf_check(args);
 494 }
 495
 496 /*
 497  * Add the new entry the "hard" way.
 498  * The caller has already converted to 8 byte inode numbers if necessary,
 499  * in which case we need to leave the i8count at 1.
 500  * Find a hole that the new entry will fit into, and copy
 501  * the first part of the entries, the new entry, and the last part of
 502  * the entries.
 503  */
 504 /* ARGSUSED */
 505 static void
 506 xfs_dir2_sf_addname_hard(
 507         xfs_da_args_t           *args,          /* operation arguments */
 508         int                     objchange,      /* changing inode number size */
 509         int                     new_isize)      /* new directory size */
 510 {
 511         int                     add_datasize;   /* data size need for new ent */
 512         char                    *buf;           /* buffer for old */
 513         xfs_inode_t             *dp;            /* incore directory inode */
 514         int                     eof;            /* reached end of old dir */
 515         int                     nbytes;         /* temp for byte copies */
 516         xfs_dir2_data_aoff_t    new_offset;     /* next offset value */
 517         xfs_dir2_data_aoff_t    offset;         /* current offset value */
 518         int                     old_isize;      /* previous di_size */
 519         xfs_dir2_sf_entry_t     *oldsfep;       /* entry in original dir */
 520         xfs_dir2_sf_hdr_t       *oldsfp;        /* original shortform dir */
 521         xfs_dir2_sf_entry_t     *sfep;          /* entry in new dir */
 522         xfs_dir2_sf_hdr_t       *sfp;           /* new shortform dir */
 523
 524         /*
 525          * Copy the old directory to the stack buffer.
 526          */
 527         dp = args->dp;
 528
 529         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 530         old_isize = (int)dp->i_d.di_size;
 531         buf = kmem_alloc(old_isize, KM_SLEEP);
 532         oldsfp = (xfs_dir2_sf_hdr_t *)buf;
 533         memcpy(oldsfp, sfp, old_isize);
 534         /*
 535          * Loop over the old directory finding the place we're going
 536          * to insert the new entry.
 537          * If it's going to end up at the end then oldsfep will point there.
 538          */
 539         for (offset = XFS_DIR2_DATA_FIRST_OFFSET,
 540               oldsfep = xfs_dir2_sf_firstentry(oldsfp),
 541               add_datasize = xfs_dir2_data_entsize(args->namelen),
 542               eof = (char *)oldsfep == &buf[old_isize];
 543              !eof;
 544              offset = new_offset + xfs_dir2_data_entsize(oldsfep->namelen),
 545               oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep),
 546               eof = (char *)oldsfep == &buf[old_isize]) {
 547                 new_offset = xfs_dir2_sf_get_offset(oldsfep);
 548                 if (offset + add_datasize <= new_offset)
 549                         break;
 550         }
 551         /*
 552          * Get rid of the old directory, then allocate space for
 553          * the new one.  We do this so xfs_idata_realloc won't copy
 554          * the data.
 555          */
 556         xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
 557         xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
 558         /*
 559          * Reset the pointer since the buffer was reallocated.
 560          */
 561         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 562         /*
 563          * Copy the first part of the directory, including the header.
 564          */
 565         nbytes = (int)((char *)oldsfep - (char *)oldsfp);
 566         memcpy(sfp, oldsfp, nbytes);
 567         sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
 568         /*
 569          * Fill in the new entry, and update the header counts.
 570          */
 571         sfep->namelen = args->namelen;
 572         xfs_dir2_sf_put_offset(sfep, offset);
 573         memcpy(sfep->name, args->name, sfep->namelen);
 574         xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
 575         sfp->count++;
 576 #if XFS_BIG_INUMS
 577         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
 578                 sfp->i8count++;
 579 #endif
 580         /*
 581          * If there's more left to copy, do that.
 582          */
 583         if (!eof) {
 584                 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 585                 memcpy(sfep, oldsfep, old_isize - nbytes);
 586         }
 587         kmem_free(buf);
 588         dp->i_d.di_size = new_isize;
 589         xfs_dir2_sf_check(args);
 590 }
 591
 592 /*
 593  * Decide if the new entry will fit at all.
 594  * If it will fit, pick between adding the new entry to the end (easy)
 595  * or somewhere else (hard).
 596  * Return 0 (won't fit), 1 (easy), 2 (hard).
 597  */
 598 /*ARGSUSED*/
 599 static int                                      /* pick result */
 600 xfs_dir2_sf_addname_pick(
 601         xfs_da_args_t           *args,          /* operation arguments */
 602         int                     objchange,      /* inode # size changes */
 603         xfs_dir2_sf_entry_t     **sfepp,        /* out(1): new entry ptr */
 604         xfs_dir2_data_aoff_t    *offsetp)       /* out(1): new offset */
 605 {
 606         xfs_inode_t             *dp;            /* incore directory inode */
 607         int                     holefit;        /* found hole it will fit in */
 608         int                     i;              /* entry number */
 609         xfs_mount_t             *mp;            /* filesystem mount point */
 610         xfs_dir2_data_aoff_t    offset;         /* data block offset */
 611         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 612         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 613         int                     size;           /* entry's data size */
 614         int                     used;           /* data bytes used */
 615
 616         dp = args->dp;
 617         mp = dp->i_mount;
 618
 619         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 620         size = xfs_dir2_data_entsize(args->namelen);
 621         offset = XFS_DIR2_DATA_FIRST_OFFSET;
 622         sfep = xfs_dir2_sf_firstentry(sfp);
 623         holefit = 0;
 624         /*
 625          * Loop over sf entries.
 626          * Keep track of data offset and whether we've seen a place
 627          * to insert the new entry.
 628          */
 629         for (i = 0; i < sfp->count; i++) {
 630                 if (!holefit)
 631                         holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
 632                 offset = xfs_dir2_sf_get_offset(sfep) +
 633                          xfs_dir2_data_entsize(sfep->namelen);
 634                 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 635         }
 636         /*
 637          * Calculate data bytes used excluding the new entry, if this
 638          * was a data block (block form directory).
 639          */
 640         used = offset +
 641                (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 642                (uint)sizeof(xfs_dir2_block_tail_t);
 643         /*
 644          * If it won't fit in a block form then we can't insert it,
 645          * we'll go back, convert to block, then try the insert and convert
 646          * to leaf.
 647          */
 648         if (used + (holefit ? 0 : size) > mp->m_dirblksize)
 649                 return 0;
 650         /*
 651          * If changing the inode number size, do it the hard way.
 652          */
 653 #if XFS_BIG_INUMS
 654         if (objchange) {
 655                 return 2;
 656         }
 657 #else
 658         ASSERT(objchange == 0);
 659 #endif
 660         /*
 661          * If it won't fit at the end then do it the hard way (use the hole).
 662          */
 663         if (used + size > mp->m_dirblksize)
 664                 return 2;
 665         /*
 666          * Do it the easy way.
 667          */
 668         *sfepp = sfep;
 669         *offsetp = offset;
 670         return 1;
 671 }
 672
 673 #ifdef DEBUG
 674 /*
 675  * Check consistency of shortform directory, assert if bad.
 676  */
 677 static void
 678 xfs_dir2_sf_check(
 679         xfs_da_args_t           *args)          /* operation arguments */
 680 {
 681         xfs_inode_t             *dp;            /* incore directory inode */
 682         int                     i;              /* entry number */
 683         int                     i8count;        /* number of big inode#s */
 684         xfs_ino_t               ino;            /* entry inode number */
 685         int                     offset;         /* data offset */
 686         xfs_dir2_sf_entry_t     *sfep;          /* shortform dir entry */
 687         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 688
 689         dp = args->dp;
 690
 691         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 692         offset = XFS_DIR2_DATA_FIRST_OFFSET;
 693         ino = xfs_dir2_sf_get_parent_ino(sfp);
 694         i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 695
 696         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
 697              i < sfp->count;
 698              i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
 699                 ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
 700                 ino = xfs_dir2_sfe_get_ino(sfp, sfep);
 701                 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 702                 offset =
 703                         xfs_dir2_sf_get_offset(sfep) +
 704                         xfs_dir2_data_entsize(sfep->namelen);
 705         }
 706         ASSERT(i8count == sfp->i8count);
 707         ASSERT(XFS_BIG_INUMS || i8count == 0);
 708         ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
 709         ASSERT(offset +
 710                (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 711                (uint)sizeof(xfs_dir2_block_tail_t) <=
 712                dp->i_mount->m_dirblksize);
 713 }
 714 #endif  /* DEBUG */
 715
 716 /*
 717  * Create a new (shortform) directory.
 718  */
 719 int                                     /* error, always 0 */
 720 xfs_dir2_sf_create(
 721         xfs_da_args_t   *args,          /* operation arguments */
 722         xfs_ino_t       pino)           /* parent inode number */
 723 {
 724         xfs_inode_t     *dp;            /* incore directory inode */
 725         int             i8count;        /* parent inode is an 8-byte number */
 726         xfs_dir2_sf_hdr_t *sfp;         /* shortform structure */
 727         int             size;           /* directory size */
 728
 729         trace_xfs_dir2_sf_create(args);
 730
 731         dp = args->dp;
 732
 733         ASSERT(dp != NULL);
 734         ASSERT(dp->i_d.di_size == 0);
 735         /*
 736          * If it's currently a zero-length extent file,
 737          * convert it to local format.
 738          */
 739         if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
 740                 dp->i_df.if_flags &= ~XFS_IFEXTENTS;    /* just in case */
 741                 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 742                 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
 743                 dp->i_df.if_flags |= XFS_IFINLINE;
 744         }
 745         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 746         ASSERT(dp->i_df.if_bytes == 0);
 747         i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
 748         size = xfs_dir2_sf_hdr_size(i8count);
 749         /*
 750          * Make a buffer for the data.
 751          */
 752         xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 753         /*
 754          * Fill in the header,
 755          */
 756         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 757         sfp->i8count = i8count;
 758         /*
 759          * Now can put in the inode number, since i8count is set.
 760          */
 761         xfs_dir2_sf_put_parent_ino(sfp, pino);
 762         sfp->count = 0;
 763         dp->i_d.di_size = size;
 764         xfs_dir2_sf_check(args);
 765         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 766         return 0;
 767 }
 768
 769 int                                             /* error */
 770 xfs_dir2_sf_getdents(
 771         xfs_inode_t             *dp,            /* incore directory inode */
 772         void                    *dirent,
 773         xfs_off_t               *offset,
 774         filldir_t               filldir)
 775 {
 776         int                     i;              /* shortform entry number */
 777         xfs_mount_t             *mp;            /* filesystem mount point */
 778         xfs_dir2_dataptr_t      off;            /* current entry's offset */
 779         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 780         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 781         xfs_dir2_dataptr_t      dot_offset;
 782         xfs_dir2_dataptr_t      dotdot_offset;
 783         xfs_ino_t               ino;
 784
 785         mp = dp->i_mount;
 786
 787         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 788         /*
 789          * Give up if the directory is way too short.
 790          */
 791         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 792                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 793                 return XFS_ERROR(EIO);
 794         }
 795
 796         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 797         ASSERT(dp->i_df.if_u1.if_data != NULL);
 798
 799         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 800
 801         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 802
 803         /*
 804          * If the block number in the offset is out of range, we're done.
 805          */
 806         if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk)
 807                 return 0;
 808
 809         /*
 810          * Precalculate offsets for . and .. as we will always need them.
 811          *
 812          * XXX(hch): the second argument is sometimes 0 and sometimes
 813          * mp->m_dirdatablk.
 814          */
 815         dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 816                                              XFS_DIR2_DATA_DOT_OFFSET);
 817         dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 818                                                 XFS_DIR2_DATA_DOTDOT_OFFSET);
 819
 820         /*
 821          * Put . entry unless we're starting past it.
 822          */
 823         if (*offset <= dot_offset) {
 824                 if (filldir(dirent, ".", 1, dot_offset & 0x7fffffff, dp->i_ino, DT_DIR)) {
 825                         *offset = dot_offset & 0x7fffffff;
 826                         return 0;
 827                 }
 828         }
 829
 830         /*
 831          * Put .. entry unless we're starting past it.
 832          */
 833         if (*offset <= dotdot_offset) {
 834                 ino = xfs_dir2_sf_get_parent_ino(sfp);
 835                 if (filldir(dirent, "..", 2, dotdot_offset & 0x7fffffff, ino, DT_DIR)) {
 836                         *offset = dotdot_offset & 0x7fffffff;
 837                         return 0;
 838                 }
 839         }
 840
 841         /*
 842          * Loop while there are more entries and put'ing works.
 843          */
 844         sfep = xfs_dir2_sf_firstentry(sfp);
 845         for (i = 0; i < sfp->count; i++) {
 846                 off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 847                                 xfs_dir2_sf_get_offset(sfep));
 848
 849                 if (*offset > off) {
 850                         sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 851                         continue;
 852                 }
 853
 854                 ino = xfs_dir2_sfe_get_ino(sfp, sfep);
 855                 if (filldir(dirent, (char *)sfep->name, sfep->namelen,
 856                             off & 0x7fffffff, ino, DT_UNKNOWN)) {
 857                         *offset = off & 0x7fffffff;
 858                         return 0;
 859                 }
 860                 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 861         }
 862
 863         *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0) &
 864                         0x7fffffff;
 865         return 0;
 866 }
 867
 868 /*
 869  * Lookup an entry in a shortform directory.
 870  * Returns EEXIST if found, ENOENT if not found.
 871  */
 872 int                                             /* error */
 873 xfs_dir2_sf_lookup(
 874         xfs_da_args_t           *args)          /* operation arguments */
 875 {
 876         xfs_inode_t             *dp;            /* incore directory inode */
 877         int                     i;              /* entry index */
 878         int                     error;
 879         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 880         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 881         enum xfs_dacmp          cmp;            /* comparison result */
 882         xfs_dir2_sf_entry_t     *ci_sfep;       /* case-insens. entry */
 883
 884         trace_xfs_dir2_sf_lookup(args);
 885
 886         xfs_dir2_sf_check(args);
 887         dp = args->dp;
 888
 889         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 890         /*
 891          * Bail out if the directory is way too short.
 892          */
 893         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 894                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 895                 return XFS_ERROR(EIO);
 896         }
 897         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 898         ASSERT(dp->i_df.if_u1.if_data != NULL);
 899         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 900         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 901         /*
 902          * Special case for .
 903          */
 904         if (args->namelen == 1 && args->name[0] == '.') {
 905                 args->inumber = dp->i_ino;
 906                 args->cmpresult = XFS_CMP_EXACT;
 907                 return XFS_ERROR(EEXIST);
 908         }
 909         /*
 910          * Special case for ..
 911          */
 912         if (args->namelen == 2 &&
 913             args->name[0] == '.' && args->name[1] == '.') {
 914                 args->inumber = xfs_dir2_sf_get_parent_ino(sfp);
 915                 args->cmpresult = XFS_CMP_EXACT;
 916                 return XFS_ERROR(EEXIST);
 917         }
 918         /*
 919          * Loop over all the entries trying to match ours.
 920          */
 921         ci_sfep = NULL;
 922         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 923                                 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
 924                 /*
 925                  * Compare name and if it's an exact match, return the inode
 926                  * number. If it's the first case-insensitive match, store the
 927                  * inode number and continue looking for an exact match.
 928                  */
 929                 cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
 930                                                                 sfep->namelen);
 931                 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
 932                         args->cmpresult = cmp;
 933                         args->inumber = xfs_dir2_sfe_get_ino(sfp, sfep);
 934                         if (cmp == XFS_CMP_EXACT)
 935                                 return XFS_ERROR(EEXIST);
 936                         ci_sfep = sfep;
 937                 }
 938         }
 939         ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 940         /*
 941          * Here, we can only be doing a lookup (not a rename or replace).
 942          * If a case-insensitive match was not found, return ENOENT.
 943          */
 944         if (!ci_sfep)
 945                 return XFS_ERROR(ENOENT);
 946         /* otherwise process the CI match as required by the caller */
 947         error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
 948         return XFS_ERROR(error);
 949 }
 950
 951 /*
 952  * Remove an entry from a shortform directory.
 953  */
 954 int                                             /* error */
 955 xfs_dir2_sf_removename(
 956         xfs_da_args_t           *args)
 957 {
 958         int                     byteoff;        /* offset of removed entry */
 959         xfs_inode_t             *dp;            /* incore directory inode */
 960         int                     entsize;        /* this entry's size */
 961         int                     i;              /* shortform entry index */
 962         int                     newsize;        /* new inode size */
 963         int                     oldsize;        /* old inode size */
 964         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 965         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 966
 967         trace_xfs_dir2_sf_removename(args);
 968
 969         dp = args->dp;
 970
 971         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 972         oldsize = (int)dp->i_d.di_size;
 973         /*
 974          * Bail out if the directory is way too short.
 975          */
 976         if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 977                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 978                 return XFS_ERROR(EIO);
 979         }
 980         ASSERT(dp->i_df.if_bytes == oldsize);
 981         ASSERT(dp->i_df.if_u1.if_data != NULL);
 982         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 983         ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
 984         /*
 985          * Loop over the old directory entries.
 986          * Find the one we're deleting.
 987          */
 988         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 989                                 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
 990                 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
 991                                                                 XFS_CMP_EXACT) {
 992                         ASSERT(xfs_dir2_sfe_get_ino(sfp, sfep) ==
 993                                args->inumber);
 994                         break;
 995                 }
 996         }
 997         /*
 998          * Didn't find it.
 999          */
1000         if (i == sfp->count)
1001                 return XFS_ERROR(ENOENT);
1002         /*
1003          * Calculate sizes.
1004          */
1005         byteoff = (int)((char *)sfep - (char *)sfp);
1006         entsize = xfs_dir2_sf_entsize(sfp, args->namelen);
1007         newsize = oldsize - entsize;
1008         /*
1009          * Copy the part if any after the removed entry, sliding it down.
1010          */
1011         if (byteoff + entsize < oldsize)
1012                 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
1013                         oldsize - (byteoff + entsize));
1014         /*
1015          * Fix up the header and file size.
1016          */
1017         sfp->count--;
1018         dp->i_d.di_size = newsize;
1019         /*
1020          * Reallocate, making it smaller.
1021          */
1022         xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
1023         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1024 #if XFS_BIG_INUMS
1025         /*
1026          * Are we changing inode number size?
1027          */
1028         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1029                 if (sfp->i8count == 1)
1030                         xfs_dir2_sf_toino4(args);
1031                 else
1032                         sfp->i8count--;
1033         }
1034 #endif
1035         xfs_dir2_sf_check(args);
1036         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1037         return 0;
1038 }
1039
1040 /*
1041  * Replace the inode number of an entry in a shortform directory.
1042  */
1043 int                                             /* error */
1044 xfs_dir2_sf_replace(
1045         xfs_da_args_t           *args)          /* operation arguments */
1046 {
1047         xfs_inode_t             *dp;            /* incore directory inode */
1048         int                     i;              /* entry index */
1049 #if XFS_BIG_INUMS || defined(DEBUG)
1050         xfs_ino_t               ino=0;          /* entry old inode number */
1051 #endif
1052 #if XFS_BIG_INUMS
1053         int                     i8elevated;     /* sf_toino8 set i8count=1 */
1054 #endif
1055         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
1056         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
1057
1058         trace_xfs_dir2_sf_replace(args);
1059
1060         dp = args->dp;
1061
1062         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1063         /*
1064          * Bail out if the shortform directory is way too small.
1065          */
1066         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1067                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
1068                 return XFS_ERROR(EIO);
1069         }
1070         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1071         ASSERT(dp->i_df.if_u1.if_data != NULL);
1072         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1073         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
1074 #if XFS_BIG_INUMS
1075         /*
1076          * New inode number is large, and need to convert to 8-byte inodes.
1077          */
1078         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
1079                 int     error;                  /* error return value */
1080                 int     newsize;                /* new inode size */
1081
1082                 newsize =
1083                         dp->i_df.if_bytes +
1084                         (sfp->count + 1) *
1085                         ((uint)sizeof(xfs_dir2_ino8_t) -
1086                          (uint)sizeof(xfs_dir2_ino4_t));
1087                 /*
1088                  * Won't fit as shortform, convert to block then do replace.
1089                  */
1090                 if (newsize > XFS_IFORK_DSIZE(dp)) {
1091                         error = xfs_dir2_sf_to_block(args);
1092                         if (error) {
1093                                 return error;
1094                         }
1095                         return xfs_dir2_block_replace(args);
1096                 }
1097                 /*
1098                  * Still fits, convert to 8-byte now.
1099                  */
1100                 xfs_dir2_sf_toino8(args);
1101                 i8elevated = 1;
1102                 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1103         } else
1104                 i8elevated = 0;
1105 #endif
1106         ASSERT(args->namelen != 1 || args->name[0] != '.');
1107         /*
1108          * Replace ..'s entry.
1109          */
1110         if (args->namelen == 2 &&
1111             args->name[0] == '.' && args->name[1] == '.') {
1112 #if XFS_BIG_INUMS || defined(DEBUG)
1113                 ino = xfs_dir2_sf_get_parent_ino(sfp);
1114                 ASSERT(args->inumber != ino);
1115 #endif
1116                 xfs_dir2_sf_put_parent_ino(sfp, args->inumber);
1117         }
1118         /*
1119          * Normal entry, look for the name.
1120          */
1121         else {
1122                 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
1123                                 i < sfp->count;
1124                                 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
1125                         if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1126                                                                 XFS_CMP_EXACT) {
1127 #if XFS_BIG_INUMS || defined(DEBUG)
1128                                 ino = xfs_dir2_sfe_get_ino(sfp, sfep);
1129                                 ASSERT(args->inumber != ino);
1130 #endif
1131                                 xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
1132                                 break;
1133                         }
1134                 }
1135                 /*
1136                  * Didn't find it.
1137                  */
1138                 if (i == sfp->count) {
1139                         ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1140 #if XFS_BIG_INUMS
1141                         if (i8elevated)
1142                                 xfs_dir2_sf_toino4(args);
1143 #endif
1144                         return XFS_ERROR(ENOENT);
1145                 }
1146         }
1147 #if XFS_BIG_INUMS
1148         /*
1149          * See if the old number was large, the new number is small.
1150          */
1151         if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1152             args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1153                 /*
1154                  * And the old count was one, so need to convert to small.
1155                  */
1156                 if (sfp->i8count == 1)
1157                         xfs_dir2_sf_toino4(args);
1158                 else
1159                         sfp->i8count--;
1160         }
1161         /*
1162          * See if the old number was small, the new number is large.
1163          */
1164         if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1165             args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1166                 /*
1167                  * add to the i8count unless we just converted to 8-byte
1168                  * inodes (which does an implied i8count = 1)
1169                  */
1170                 ASSERT(sfp->i8count != 0);
1171                 if (!i8elevated)
1172                         sfp->i8count++;
1173         }
1174 #endif
1175         xfs_dir2_sf_check(args);
1176         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1177         return 0;
1178 }
1179
1180 #if XFS_BIG_INUMS
1181 /*
1182  * Convert from 8-byte inode numbers to 4-byte inode numbers.
1183  * The last 8-byte inode number is gone, but the count is still 1.
1184  */
1185 static void
1186 xfs_dir2_sf_toino4(
1187         xfs_da_args_t           *args)          /* operation arguments */
1188 {
1189         char                    *buf;           /* old dir's buffer */
1190         xfs_inode_t             *dp;            /* incore directory inode */
1191         int                     i;              /* entry index */
1192         int                     newsize;        /* new inode size */
1193         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1194         xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
1195         int                     oldsize;        /* old inode size */
1196         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1197         xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
1198
1199         trace_xfs_dir2_sf_toino4(args);
1200
1201         dp = args->dp;
1202
1203         /*
1204          * Copy the old directory to the buffer.
1205          * Then nuke it from the inode, and add the new buffer to the inode.
1206          * Don't want xfs_idata_realloc copying the data here.
1207          */
1208         oldsize = dp->i_df.if_bytes;
1209         buf = kmem_alloc(oldsize, KM_SLEEP);
1210         oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1211         ASSERT(oldsfp->i8count == 1);
1212         memcpy(buf, oldsfp, oldsize);
1213         /*
1214          * Compute the new inode size.
1215          */
1216         newsize =
1217                 oldsize -
1218                 (oldsfp->count + 1) *
1219                 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1220         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1221         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1222         /*
1223          * Reset our pointers, the data has moved.
1224          */
1225         oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1226         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1227         /*
1228          * Fill in the new header.
1229          */
1230         sfp->count = oldsfp->count;
1231         sfp->i8count = 0;
1232         xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
1233         /*
1234          * Copy the entries field by field.
1235          */
1236         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1237                     oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1238              i < sfp->count;
1239              i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1240                   oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1241                 sfep->namelen = oldsfep->namelen;
1242                 sfep->offset = oldsfep->offset;
1243                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1244                 xfs_dir2_sfe_put_ino(sfp, sfep,
1245                         xfs_dir2_sfe_get_ino(oldsfp, oldsfep));
1246         }
1247         /*
1248          * Clean up the inode.
1249          */
1250         kmem_free(buf);
1251         dp->i_d.di_size = newsize;
1252         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1253 }
1254
1255 /*
1256  * Convert from 4-byte inode numbers to 8-byte inode numbers.
1257  * The new 8-byte inode number is not there yet, we leave with the
1258  * count 1 but no corresponding entry.
1259  */
1260 static void
1261 xfs_dir2_sf_toino8(
1262         xfs_da_args_t           *args)          /* operation arguments */
1263 {
1264         char                    *buf;           /* old dir's buffer */
1265         xfs_inode_t             *dp;            /* incore directory inode */
1266         int                     i;              /* entry index */
1267         int                     newsize;        /* new inode size */
1268         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1269         xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
1270         int                     oldsize;        /* old inode size */
1271         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1272         xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
1273
1274         trace_xfs_dir2_sf_toino8(args);
1275
1276         dp = args->dp;
1277
1278         /*
1279          * Copy the old directory to the buffer.
1280          * Then nuke it from the inode, and add the new buffer to the inode.
1281          * Don't want xfs_idata_realloc copying the data here.
1282          */
1283         oldsize = dp->i_df.if_bytes;
1284         buf = kmem_alloc(oldsize, KM_SLEEP);
1285         oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1286         ASSERT(oldsfp->i8count == 0);
1287         memcpy(buf, oldsfp, oldsize);
1288         /*
1289          * Compute the new inode size.
1290          */
1291         newsize =
1292                 oldsize +
1293                 (oldsfp->count + 1) *
1294                 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1295         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1296         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1297         /*
1298          * Reset our pointers, the data has moved.
1299          */
1300         oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1301         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1302         /*
1303          * Fill in the new header.
1304          */
1305         sfp->count = oldsfp->count;
1306         sfp->i8count = 1;
1307         xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
1308         /*
1309          * Copy the entries field by field.
1310          */
1311         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1312                     oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1313              i < sfp->count;
1314              i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1315                   oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1316                 sfep->namelen = oldsfep->namelen;
1317                 sfep->offset = oldsfep->offset;
1318                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1319                 xfs_dir2_sfe_put_ino(sfp, sfep,
1320                         xfs_dir2_sfe_get_ino(oldsfp, oldsfep));
1321         }
1322         /*
1323          * Clean up the inode.
1324          */
1325         kmem_free(buf);
1326         dp->i_d.di_size = newsize;
1327         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1328 }
1329 #endif  /* XFS_BIG_INUMS */