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_dir2.h"
  26 #include "xfs_dmapi.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_da_btree.h"
  29 #include "xfs_bmap_btree.h"
  30 #include "xfs_dir2_sf.h"
  31 #include "xfs_attr_sf.h"
  32 #include "xfs_dinode.h"
  33 #include "xfs_inode.h"
  34 #include "xfs_inode_item.h"
  35 #include "xfs_error.h"
  36 #include "xfs_dir2_data.h"
  37 #include "xfs_dir2_leaf.h"
  38 #include "xfs_dir2_block.h"
  39 #include "xfs_dir2_trace.h"
  40
  41 /*
  42  * Prototypes for internal functions.
  43  */
  44 static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
  45                                      xfs_dir2_sf_entry_t *sfep,
  46                                      xfs_dir2_data_aoff_t offset,
  47                                      int new_isize);
  48 static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
  49                                      int new_isize);
  50 static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
  51                                     xfs_dir2_sf_entry_t **sfepp,
  52                                     xfs_dir2_data_aoff_t *offsetp);
  53 #ifdef DEBUG
  54 static void xfs_dir2_sf_check(xfs_da_args_t *args);
  55 #else
  56 #define xfs_dir2_sf_check(args)
  57 #endif /* DEBUG */
  58 #if XFS_BIG_INUMS
  59 static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
  60 static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
  61 #endif /* XFS_BIG_INUMS */
  62
  63 /*
  64  * Given a block directory (dp/block), calculate its size as a shortform (sf)
  65  * directory and a header for the sf directory, if it will fit it the
  66  * space currently present in the inode.  If it won't fit, the output
  67  * size is too big (but not accurate).
  68  */
  69 int                                             /* size for sf form */
  70 xfs_dir2_block_sfsize(
  71         xfs_inode_t             *dp,            /* incore inode pointer */
  72         xfs_dir2_block_t        *block,         /* block directory data */
  73         xfs_dir2_sf_hdr_t       *sfhp)          /* output: header for sf form */
  74 {
  75         xfs_dir2_dataptr_t      addr;           /* data entry address */
  76         xfs_dir2_leaf_entry_t   *blp;           /* leaf area of the block */
  77         xfs_dir2_block_tail_t   *btp;           /* tail area of the block */
  78         int                     count;          /* shortform entry count */
  79         xfs_dir2_data_entry_t   *dep;           /* data entry in the block */
  80         int                     i;              /* block entry index */
  81         int                     i8count;        /* count of big-inode entries */
  82         int                     isdot;          /* entry is "." */
  83         int                     isdotdot;       /* entry is ".." */
  84         xfs_mount_t             *mp;            /* mount structure pointer */
  85         int                     namelen;        /* total name bytes */
  86         xfs_ino_t               parent = 0;     /* parent inode number */
  87         int                     size=0;         /* total computed size */
  88
  89         mp = dp->i_mount;
  90
  91         count = i8count = namelen = 0;
  92         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
  93         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
  94
  95         /*
  96          * Iterate over the block's data entries by using the leaf pointers.
  97          */
  98         for (i = 0; i < be32_to_cpu(btp->count); i++) {
  99                 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
 100                         continue;
 101                 /*
 102                  * Calculate the pointer to the entry at hand.
 103                  */
 104                 dep = (xfs_dir2_data_entry_t *)
 105                       ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr));
 106                 /*
 107                  * Detect . and .., so we can special-case them.
 108                  * . is not included in sf directories.
 109                  * .. is included by just the parent inode number.
 110                  */
 111                 isdot = dep->namelen == 1 && dep->name[0] == '.';
 112                 isdotdot =
 113                         dep->namelen == 2 &&
 114                         dep->name[0] == '.' && dep->name[1] == '.';
 115 #if XFS_BIG_INUMS
 116                 if (!isdot)
 117                         i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
 118 #endif
 119                 if (!isdot && !isdotdot) {
 120                         count++;
 121                         namelen += dep->namelen;
 122                 } else if (isdotdot)
 123                         parent = be64_to_cpu(dep->inumber);
 124                 /*
 125                  * Calculate the new size, see if we should give up yet.
 126                  */
 127                 size = XFS_DIR2_SF_HDR_SIZE(i8count) +          /* header */
 128                        count +                                  /* namelen */
 129                        count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
 130                        namelen +                                /* name */
 131                        (i8count ?                               /* inumber */
 132                                 (uint)sizeof(xfs_dir2_ino8_t) * count :
 133                                 (uint)sizeof(xfs_dir2_ino4_t) * count);
 134                 if (size > XFS_IFORK_DSIZE(dp))
 135                         return size;            /* size value is a failure */
 136         }
 137         /*
 138          * Create the output header, if it worked.
 139          */
 140         sfhp->count = count;
 141         sfhp->i8count = i8count;
 142         XFS_DIR2_SF_PUT_INUMBER((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent);
 143         return size;
 144 }
 145
 146 /*
 147  * Convert a block format directory to shortform.
 148  * Caller has already checked that it will fit, and built us a header.
 149  */
 150 int                                             /* error */
 151 xfs_dir2_block_to_sf(
 152         xfs_da_args_t           *args,          /* operation arguments */
 153         xfs_dabuf_t             *bp,            /* block buffer */
 154         int                     size,           /* shortform directory size */
 155         xfs_dir2_sf_hdr_t       *sfhp)          /* shortform directory hdr */
 156 {
 157         xfs_dir2_block_t        *block;         /* block structure */
 158         xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
 159         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
 160         xfs_inode_t             *dp;            /* incore directory inode */
 161         xfs_dir2_data_unused_t  *dup;           /* unused data pointer */
 162         char                    *endptr;        /* end of data entries */
 163         int                     error;          /* error return value */
 164         int                     logflags;       /* inode logging flags */
 165         xfs_mount_t             *mp;            /* filesystem mount point */
 166         char                    *ptr;           /* current data pointer */
 167         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 168         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 169         xfs_ino_t               temp;
 170
 171         xfs_dir2_trace_args_sb("block_to_sf", args, size, bp);
 172         dp = args->dp;
 173         mp = dp->i_mount;
 174
 175         /*
 176          * Make a copy of the block data, so we can shrink the inode
 177          * and add local data.
 178          */
 179         block = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
 180         memcpy(block, bp->data, mp->m_dirblksize);
 181         logflags = XFS_ILOG_CORE;
 182         if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
 183                 ASSERT(error != ENOSPC);
 184                 goto out;
 185         }
 186         /*
 187          * The buffer is now unconditionally gone, whether
 188          * xfs_dir2_shrink_inode worked or not.
 189          *
 190          * Convert the inode to local format.
 191          */
 192         dp->i_df.if_flags &= ~XFS_IFEXTENTS;
 193         dp->i_df.if_flags |= XFS_IFINLINE;
 194         dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 195         ASSERT(dp->i_df.if_bytes == 0);
 196         xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 197         logflags |= XFS_ILOG_DDATA;
 198         /*
 199          * Copy the header into the newly allocate local space.
 200          */
 201         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 202         memcpy(sfp, sfhp, XFS_DIR2_SF_HDR_SIZE(sfhp->i8count));
 203         dp->i_d.di_size = size;
 204         /*
 205          * Set up to loop over the block's entries.
 206          */
 207         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 208         ptr = (char *)block->u;
 209         endptr = (char *)XFS_DIR2_BLOCK_LEAF_P(btp);
 210         sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 211         /*
 212          * Loop over the active and unused entries.
 213          * Stop when we reach the leaf/tail portion of the block.
 214          */
 215         while (ptr < endptr) {
 216                 /*
 217                  * If it's unused, just skip over it.
 218                  */
 219                 dup = (xfs_dir2_data_unused_t *)ptr;
 220                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 221                         ptr += be16_to_cpu(dup->length);
 222                         continue;
 223                 }
 224                 dep = (xfs_dir2_data_entry_t *)ptr;
 225                 /*
 226                  * Skip .
 227                  */
 228                 if (dep->namelen == 1 && dep->name[0] == '.')
 229                         ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
 230                 /*
 231                  * Skip .., but make sure the inode number is right.
 232                  */
 233                 else if (dep->namelen == 2 &&
 234                          dep->name[0] == '.' && dep->name[1] == '.')
 235                         ASSERT(be64_to_cpu(dep->inumber) ==
 236                                XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent));
 237                 /*
 238                  * Normal entry, copy it into shortform.
 239                  */
 240                 else {
 241                         sfep->namelen = dep->namelen;
 242                         XFS_DIR2_SF_PUT_OFFSET(sfep,
 243                                 (xfs_dir2_data_aoff_t)
 244                                 ((char *)dep - (char *)block));
 245                         memcpy(sfep->name, dep->name, dep->namelen);
 246                         temp = be64_to_cpu(dep->inumber);
 247                         XFS_DIR2_SF_PUT_INUMBER(sfp, &temp,
 248                                 XFS_DIR2_SF_INUMBERP(sfep));
 249                         sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
 250                 }
 251                 ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen);
 252         }
 253         ASSERT((char *)sfep - (char *)sfp == size);
 254         xfs_dir2_sf_check(args);
 255 out:
 256         xfs_trans_log_inode(args->trans, dp, logflags);
 257         kmem_free(block, mp->m_dirblksize);
 258         return error;
 259 }
 260
 261 /*
 262  * Add a name to a shortform directory.
 263  * There are two algorithms, "easy" and "hard" which we decide on
 264  * before changing anything.
 265  * Convert to block form if necessary, if the new entry won't fit.
 266  */
 267 int                                             /* error */
 268 xfs_dir2_sf_addname(
 269         xfs_da_args_t           *args)          /* operation arguments */
 270 {
 271         int                     add_entsize;    /* size of the new entry */
 272         xfs_inode_t             *dp;            /* incore directory inode */
 273         int                     error;          /* error return value */
 274         int                     incr_isize;     /* total change in size */
 275         int                     new_isize;      /* di_size after adding name */
 276         int                     objchange;      /* changing to 8-byte inodes */
 277         xfs_dir2_data_aoff_t    offset = 0;     /* offset for new entry */
 278         int                     old_isize;      /* di_size before adding name */
 279         int                     pick;           /* which algorithm to use */
 280         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 281         xfs_dir2_sf_entry_t     *sfep = NULL;   /* shortform entry */
 282
 283         xfs_dir2_trace_args("sf_addname", args);
 284         ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
 285         dp = args->dp;
 286         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 287         /*
 288          * Make sure the shortform value has some of its header.
 289          */
 290         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 291                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 292                 return XFS_ERROR(EIO);
 293         }
 294         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 295         ASSERT(dp->i_df.if_u1.if_data != NULL);
 296         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 297         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
 298         /*
 299          * Compute entry (and change in) size.
 300          */
 301         add_entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen);
 302         incr_isize = add_entsize;
 303         objchange = 0;
 304 #if XFS_BIG_INUMS
 305         /*
 306          * Do we have to change to 8 byte inodes?
 307          */
 308         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
 309                 /*
 310                  * Yes, adjust the entry size and the total size.
 311                  */
 312                 add_entsize +=
 313                         (uint)sizeof(xfs_dir2_ino8_t) -
 314                         (uint)sizeof(xfs_dir2_ino4_t);
 315                 incr_isize +=
 316                         (sfp->hdr.count + 2) *
 317                         ((uint)sizeof(xfs_dir2_ino8_t) -
 318                          (uint)sizeof(xfs_dir2_ino4_t));
 319                 objchange = 1;
 320         }
 321 #endif
 322         old_isize = (int)dp->i_d.di_size;
 323         new_isize = old_isize + incr_isize;
 324         /*
 325          * Won't fit as shortform any more (due to size),
 326          * or the pick routine says it won't (due to offset values).
 327          */
 328         if (new_isize > XFS_IFORK_DSIZE(dp) ||
 329             (pick =
 330              xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
 331                 /*
 332                  * Just checking or no space reservation, it doesn't fit.
 333                  */
 334                 if (args->justcheck || args->total == 0)
 335                         return XFS_ERROR(ENOSPC);
 336                 /*
 337                  * Convert to block form then add the name.
 338                  */
 339                 error = xfs_dir2_sf_to_block(args);
 340                 if (error)
 341                         return error;
 342                 return xfs_dir2_block_addname(args);
 343         }
 344         /*
 345          * Just checking, it fits.
 346          */
 347         if (args->justcheck)
 348                 return 0;
 349         /*
 350          * Do it the easy way - just add it at the end.
 351          */
 352         if (pick == 1)
 353                 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
 354         /*
 355          * Do it the hard way - look for a place to insert the new entry.
 356          * Convert to 8 byte inode numbers first if necessary.
 357          */
 358         else {
 359                 ASSERT(pick == 2);
 360 #if XFS_BIG_INUMS
 361                 if (objchange)
 362                         xfs_dir2_sf_toino8(args);
 363 #endif
 364                 xfs_dir2_sf_addname_hard(args, objchange, new_isize);
 365         }
 366         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 367         return 0;
 368 }
 369
 370 /*
 371  * Add the new entry the "easy" way.
 372  * This is copying the old directory and adding the new entry at the end.
 373  * Since it's sorted by "offset" we need room after the last offset
 374  * that's already there, and then room to convert to a block directory.
 375  * This is already checked by the pick routine.
 376  */
 377 static void
 378 xfs_dir2_sf_addname_easy(
 379         xfs_da_args_t           *args,          /* operation arguments */
 380         xfs_dir2_sf_entry_t     *sfep,          /* pointer to new entry */
 381         xfs_dir2_data_aoff_t    offset,         /* offset to use for new ent */
 382         int                     new_isize)      /* new directory size */
 383 {
 384         int                     byteoff;        /* byte offset in sf dir */
 385         xfs_inode_t             *dp;            /* incore directory inode */
 386         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 387
 388         dp = args->dp;
 389
 390         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 391         byteoff = (int)((char *)sfep - (char *)sfp);
 392         /*
 393          * Grow the in-inode space.
 394          */
 395         xfs_idata_realloc(dp, XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen),
 396                 XFS_DATA_FORK);
 397         /*
 398          * Need to set up again due to realloc of the inode data.
 399          */
 400         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 401         sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
 402         /*
 403          * Fill in the new entry.
 404          */
 405         sfep->namelen = args->namelen;
 406         XFS_DIR2_SF_PUT_OFFSET(sfep, offset);
 407         memcpy(sfep->name, args->name, sfep->namelen);
 408         XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber,
 409                 XFS_DIR2_SF_INUMBERP(sfep));
 410         /*
 411          * Update the header and inode.
 412          */
 413         sfp->hdr.count++;
 414 #if XFS_BIG_INUMS
 415         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
 416                 sfp->hdr.i8count++;
 417 #endif
 418         dp->i_d.di_size = new_isize;
 419         xfs_dir2_sf_check(args);
 420 }
 421
 422 /*
 423  * Add the new entry the "hard" way.
 424  * The caller has already converted to 8 byte inode numbers if necessary,
 425  * in which case we need to leave the i8count at 1.
 426  * Find a hole that the new entry will fit into, and copy
 427  * the first part of the entries, the new entry, and the last part of
 428  * the entries.
 429  */
 430 /* ARGSUSED */
 431 static void
 432 xfs_dir2_sf_addname_hard(
 433         xfs_da_args_t           *args,          /* operation arguments */
 434         int                     objchange,      /* changing inode number size */
 435         int                     new_isize)      /* new directory size */
 436 {
 437         int                     add_datasize;   /* data size need for new ent */
 438         char                    *buf;           /* buffer for old */
 439         xfs_inode_t             *dp;            /* incore directory inode */
 440         int                     eof;            /* reached end of old dir */
 441         int                     nbytes;         /* temp for byte copies */
 442         xfs_dir2_data_aoff_t    new_offset;     /* next offset value */
 443         xfs_dir2_data_aoff_t    offset;         /* current offset value */
 444         int                     old_isize;      /* previous di_size */
 445         xfs_dir2_sf_entry_t     *oldsfep;       /* entry in original dir */
 446         xfs_dir2_sf_t           *oldsfp;        /* original shortform dir */
 447         xfs_dir2_sf_entry_t     *sfep;          /* entry in new dir */
 448         xfs_dir2_sf_t           *sfp;           /* new shortform dir */
 449
 450         /*
 451          * Copy the old directory to the stack buffer.
 452          */
 453         dp = args->dp;
 454
 455         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 456         old_isize = (int)dp->i_d.di_size;
 457         buf = kmem_alloc(old_isize, KM_SLEEP);
 458         oldsfp = (xfs_dir2_sf_t *)buf;
 459         memcpy(oldsfp, sfp, old_isize);
 460         /*
 461          * Loop over the old directory finding the place we're going
 462          * to insert the new entry.
 463          * If it's going to end up at the end then oldsfep will point there.
 464          */
 465         for (offset = XFS_DIR2_DATA_FIRST_OFFSET,
 466               oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp),
 467               add_datasize = XFS_DIR2_DATA_ENTSIZE(args->namelen),
 468               eof = (char *)oldsfep == &buf[old_isize];
 469              !eof;
 470              offset = new_offset + XFS_DIR2_DATA_ENTSIZE(oldsfep->namelen),
 471               oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep),
 472               eof = (char *)oldsfep == &buf[old_isize]) {
 473                 new_offset = XFS_DIR2_SF_GET_OFFSET(oldsfep);
 474                 if (offset + add_datasize <= new_offset)
 475                         break;
 476         }
 477         /*
 478          * Get rid of the old directory, then allocate space for
 479          * the new one.  We do this so xfs_idata_realloc won't copy
 480          * the data.
 481          */
 482         xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
 483         xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
 484         /*
 485          * Reset the pointer since the buffer was reallocated.
 486          */
 487         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 488         /*
 489          * Copy the first part of the directory, including the header.
 490          */
 491         nbytes = (int)((char *)oldsfep - (char *)oldsfp);
 492         memcpy(sfp, oldsfp, nbytes);
 493         sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
 494         /*
 495          * Fill in the new entry, and update the header counts.
 496          */
 497         sfep->namelen = args->namelen;
 498         XFS_DIR2_SF_PUT_OFFSET(sfep, offset);
 499         memcpy(sfep->name, args->name, sfep->namelen);
 500         XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber,
 501                 XFS_DIR2_SF_INUMBERP(sfep));
 502         sfp->hdr.count++;
 503 #if XFS_BIG_INUMS
 504         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
 505                 sfp->hdr.i8count++;
 506 #endif
 507         /*
 508          * If there's more left to copy, do that.
 509          */
 510         if (!eof) {
 511                 sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
 512                 memcpy(sfep, oldsfep, old_isize - nbytes);
 513         }
 514         kmem_free(buf, old_isize);
 515         dp->i_d.di_size = new_isize;
 516         xfs_dir2_sf_check(args);
 517 }
 518
 519 /*
 520  * Decide if the new entry will fit at all.
 521  * If it will fit, pick between adding the new entry to the end (easy)
 522  * or somewhere else (hard).
 523  * Return 0 (won't fit), 1 (easy), 2 (hard).
 524  */
 525 /*ARGSUSED*/
 526 static int                                      /* pick result */
 527 xfs_dir2_sf_addname_pick(
 528         xfs_da_args_t           *args,          /* operation arguments */
 529         int                     objchange,      /* inode # size changes */
 530         xfs_dir2_sf_entry_t     **sfepp,        /* out(1): new entry ptr */
 531         xfs_dir2_data_aoff_t    *offsetp)       /* out(1): new offset */
 532 {
 533         xfs_inode_t             *dp;            /* incore directory inode */
 534         int                     holefit;        /* found hole it will fit in */
 535         int                     i;              /* entry number */
 536         xfs_mount_t             *mp;            /* filesystem mount point */
 537         xfs_dir2_data_aoff_t    offset;         /* data block offset */
 538         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 539         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 540         int                     size;           /* entry's data size */
 541         int                     used;           /* data bytes used */
 542
 543         dp = args->dp;
 544         mp = dp->i_mount;
 545
 546         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 547         size = XFS_DIR2_DATA_ENTSIZE(args->namelen);
 548         offset = XFS_DIR2_DATA_FIRST_OFFSET;
 549         sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 550         holefit = 0;
 551         /*
 552          * Loop over sf entries.
 553          * Keep track of data offset and whether we've seen a place
 554          * to insert the new entry.
 555          */
 556         for (i = 0; i < sfp->hdr.count; i++) {
 557                 if (!holefit)
 558                         holefit = offset + size <= XFS_DIR2_SF_GET_OFFSET(sfep);
 559                 offset = XFS_DIR2_SF_GET_OFFSET(sfep) +
 560                          XFS_DIR2_DATA_ENTSIZE(sfep->namelen);
 561                 sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
 562         }
 563         /*
 564          * Calculate data bytes used excluding the new entry, if this
 565          * was a data block (block form directory).
 566          */
 567         used = offset +
 568                (sfp->hdr.count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 569                (uint)sizeof(xfs_dir2_block_tail_t);
 570         /*
 571          * If it won't fit in a block form then we can't insert it,
 572          * we'll go back, convert to block, then try the insert and convert
 573          * to leaf.
 574          */
 575         if (used + (holefit ? 0 : size) > mp->m_dirblksize)
 576                 return 0;
 577         /*
 578          * If changing the inode number size, do it the hard way.
 579          */
 580 #if XFS_BIG_INUMS
 581         if (objchange) {
 582                 return 2;
 583         }
 584 #else
 585         ASSERT(objchange == 0);
 586 #endif
 587         /*
 588          * If it won't fit at the end then do it the hard way (use the hole).
 589          */
 590         if (used + size > mp->m_dirblksize)
 591                 return 2;
 592         /*
 593          * Do it the easy way.
 594          */
 595         *sfepp = sfep;
 596         *offsetp = offset;
 597         return 1;
 598 }
 599
 600 #ifdef DEBUG
 601 /*
 602  * Check consistency of shortform directory, assert if bad.
 603  */
 604 static void
 605 xfs_dir2_sf_check(
 606         xfs_da_args_t           *args)          /* operation arguments */
 607 {
 608         xfs_inode_t             *dp;            /* incore directory inode */
 609         int                     i;              /* entry number */
 610         int                     i8count;        /* number of big inode#s */
 611         xfs_ino_t               ino;            /* entry inode number */
 612         int                     offset;         /* data offset */
 613         xfs_dir2_sf_entry_t     *sfep;          /* shortform dir entry */
 614         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 615
 616         dp = args->dp;
 617
 618         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 619         offset = XFS_DIR2_DATA_FIRST_OFFSET;
 620         ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
 621         i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 622
 623         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 624              i < sfp->hdr.count;
 625              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
 626                 ASSERT(XFS_DIR2_SF_GET_OFFSET(sfep) >= offset);
 627                 ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep));
 628                 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 629                 offset =
 630                         XFS_DIR2_SF_GET_OFFSET(sfep) +
 631                         XFS_DIR2_DATA_ENTSIZE(sfep->namelen);
 632         }
 633         ASSERT(i8count == sfp->hdr.i8count);
 634         ASSERT(XFS_BIG_INUMS || i8count == 0);
 635         ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
 636         ASSERT(offset +
 637                (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 638                (uint)sizeof(xfs_dir2_block_tail_t) <=
 639                dp->i_mount->m_dirblksize);
 640 }
 641 #endif  /* DEBUG */
 642
 643 /*
 644  * Create a new (shortform) directory.
 645  */
 646 int                                     /* error, always 0 */
 647 xfs_dir2_sf_create(
 648         xfs_da_args_t   *args,          /* operation arguments */
 649         xfs_ino_t       pino)           /* parent inode number */
 650 {
 651         xfs_inode_t     *dp;            /* incore directory inode */
 652         int             i8count;        /* parent inode is an 8-byte number */
 653         xfs_dir2_sf_t   *sfp;           /* shortform structure */
 654         int             size;           /* directory size */
 655
 656         xfs_dir2_trace_args_i("sf_create", args, pino);
 657         dp = args->dp;
 658
 659         ASSERT(dp != NULL);
 660         ASSERT(dp->i_d.di_size == 0);
 661         /*
 662          * If it's currently a zero-length extent file,
 663          * convert it to local format.
 664          */
 665         if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
 666                 dp->i_df.if_flags &= ~XFS_IFEXTENTS;    /* just in case */
 667                 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 668                 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
 669                 dp->i_df.if_flags |= XFS_IFINLINE;
 670         }
 671         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 672         ASSERT(dp->i_df.if_bytes == 0);
 673         i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
 674         size = XFS_DIR2_SF_HDR_SIZE(i8count);
 675         /*
 676          * Make a buffer for the data.
 677          */
 678         xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 679         /*
 680          * Fill in the header,
 681          */
 682         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 683         sfp->hdr.i8count = i8count;
 684         /*
 685          * Now can put in the inode number, since i8count is set.
 686          */
 687         XFS_DIR2_SF_PUT_INUMBER(sfp, &pino, &sfp->hdr.parent);
 688         sfp->hdr.count = 0;
 689         dp->i_d.di_size = size;
 690         xfs_dir2_sf_check(args);
 691         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 692         return 0;
 693 }
 694
 695 int                                             /* error */
 696 xfs_dir2_sf_getdents(
 697         xfs_inode_t             *dp,            /* incore directory inode */
 698         uio_t                   *uio,           /* caller's buffer control */
 699         int                     *eofp,          /* eof reached? (out) */
 700         xfs_dirent_t            *dbp,           /* caller's buffer */
 701         xfs_dir2_put_t          put)            /* abi's formatting function */
 702 {
 703         int                     error;          /* error return value */
 704         int                     i;              /* shortform entry number */
 705         xfs_mount_t             *mp;            /* filesystem mount point */
 706         xfs_dir2_dataptr_t      off;            /* current entry's offset */
 707         xfs_dir2_put_args_t     p;              /* arg package for put rtn */
 708         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 709         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 710         xfs_off_t                       dir_offset;
 711
 712         mp = dp->i_mount;
 713
 714         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 715         /*
 716          * Give up if the directory is way too short.
 717          */
 718         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 719                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 720                 return XFS_ERROR(EIO);
 721         }
 722
 723         dir_offset = uio->uio_offset;
 724
 725         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 726         ASSERT(dp->i_df.if_u1.if_data != NULL);
 727
 728         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 729
 730         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
 731
 732         /*
 733          * If the block number in the offset is out of range, we're done.
 734          */
 735         if (XFS_DIR2_DATAPTR_TO_DB(mp, dir_offset) > mp->m_dirdatablk) {
 736                 *eofp = 1;
 737                 return 0;
 738         }
 739
 740         /*
 741          * Set up putargs structure.
 742          */
 743         p.dbp = dbp;
 744         p.put = put;
 745         p.uio = uio;
 746         /*
 747          * Put . entry unless we're starting past it.
 748          */
 749         if (dir_offset <=
 750                     XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 751                                                XFS_DIR2_DATA_DOT_OFFSET)) {
 752                 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, 0,
 753                                                 XFS_DIR2_DATA_DOTDOT_OFFSET);
 754                 p.ino = dp->i_ino;
 755 #if XFS_BIG_INUMS
 756                 p.ino += mp->m_inoadd;
 757 #endif
 758                 p.name = ".";
 759                 p.namelen = 1;
 760
 761                 error = p.put(&p);
 762
 763                 if (!p.done) {
 764                         uio->uio_offset =
 765                                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 766                                                 XFS_DIR2_DATA_DOT_OFFSET);
 767                         return error;
 768                 }
 769         }
 770
 771         /*
 772          * Put .. entry unless we're starting past it.
 773          */
 774         if (dir_offset <=
 775                     XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 776                                                XFS_DIR2_DATA_DOTDOT_OFFSET)) {
 777                 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 778                                                 XFS_DIR2_DATA_FIRST_OFFSET);
 779                 p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
 780 #if XFS_BIG_INUMS
 781                 p.ino += mp->m_inoadd;
 782 #endif
 783                 p.name = "..";
 784                 p.namelen = 2;
 785
 786                 error = p.put(&p);
 787
 788                 if (!p.done) {
 789                         uio->uio_offset =
 790                                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 791                                         XFS_DIR2_DATA_DOTDOT_OFFSET);
 792                         return error;
 793                 }
 794         }
 795
 796         /*
 797          * Loop while there are more entries and put'ing works.
 798          */
 799         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 800                      i < sfp->hdr.count;
 801                              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
 802
 803                 off = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 804                                 XFS_DIR2_SF_GET_OFFSET(sfep));
 805
 806                 if (dir_offset > off)
 807                         continue;
 808
 809                 p.namelen = sfep->namelen;
 810
 811                 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 812                         XFS_DIR2_SF_GET_OFFSET(sfep) +
 813                         XFS_DIR2_DATA_ENTSIZE(p.namelen));
 814
 815                 p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep));
 816 #if XFS_BIG_INUMS
 817                 p.ino += mp->m_inoadd;
 818 #endif
 819                 p.name = (char *)sfep->name;
 820
 821                 error = p.put(&p);
 822
 823                 if (!p.done) {
 824                         uio->uio_offset = off;
 825                         return error;
 826                 }
 827         }
 828
 829         /*
 830          * They all fit.
 831          */
 832         *eofp = 1;
 833
 834         uio->uio_offset =
 835                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk + 1, 0);
 836
 837         return 0;
 838 }
 839
 840 /*
 841  * Lookup an entry in a shortform directory.
 842  * Returns EEXIST if found, ENOENT if not found.
 843  */
 844 int                                             /* error */
 845 xfs_dir2_sf_lookup(
 846         xfs_da_args_t           *args)          /* operation arguments */
 847 {
 848         xfs_inode_t             *dp;            /* incore directory inode */
 849         int                     i;              /* entry index */
 850         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 851         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 852
 853         xfs_dir2_trace_args("sf_lookup", args);
 854         xfs_dir2_sf_check(args);
 855         dp = args->dp;
 856
 857         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 858         /*
 859          * Bail out if the directory is way too short.
 860          */
 861         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 862                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 863                 return XFS_ERROR(EIO);
 864         }
 865         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 866         ASSERT(dp->i_df.if_u1.if_data != NULL);
 867         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 868         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
 869         /*
 870          * Special case for .
 871          */
 872         if (args->namelen == 1 && args->name[0] == '.') {
 873                 args->inumber = dp->i_ino;
 874                 return XFS_ERROR(EEXIST);
 875         }
 876         /*
 877          * Special case for ..
 878          */
 879         if (args->namelen == 2 &&
 880             args->name[0] == '.' && args->name[1] == '.') {
 881                 args->inumber = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
 882                 return XFS_ERROR(EEXIST);
 883         }
 884         /*
 885          * Loop over all the entries trying to match ours.
 886          */
 887         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 888              i < sfp->hdr.count;
 889              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
 890                 if (sfep->namelen == args->namelen &&
 891                     sfep->name[0] == args->name[0] &&
 892                     memcmp(args->name, sfep->name, args->namelen) == 0) {
 893                         args->inumber =
 894                                 XFS_DIR2_SF_GET_INUMBER(sfp,
 895                                         XFS_DIR2_SF_INUMBERP(sfep));
 896                         return XFS_ERROR(EEXIST);
 897                 }
 898         }
 899         /*
 900          * Didn't find it.
 901          */
 902         ASSERT(args->oknoent);
 903         return XFS_ERROR(ENOENT);
 904 }
 905
 906 /*
 907  * Remove an entry from a shortform directory.
 908  */
 909 int                                             /* error */
 910 xfs_dir2_sf_removename(
 911         xfs_da_args_t           *args)
 912 {
 913         int                     byteoff;        /* offset of removed entry */
 914         xfs_inode_t             *dp;            /* incore directory inode */
 915         int                     entsize;        /* this entry's size */
 916         int                     i;              /* shortform entry index */
 917         int                     newsize;        /* new inode size */
 918         int                     oldsize;        /* old inode size */
 919         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 920         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 921
 922         xfs_dir2_trace_args("sf_removename", args);
 923         dp = args->dp;
 924
 925         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 926         oldsize = (int)dp->i_d.di_size;
 927         /*
 928          * Bail out if the directory is way too short.
 929          */
 930         if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 931                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 932                 return XFS_ERROR(EIO);
 933         }
 934         ASSERT(dp->i_df.if_bytes == oldsize);
 935         ASSERT(dp->i_df.if_u1.if_data != NULL);
 936         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 937         ASSERT(oldsize >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
 938         /*
 939          * Loop over the old directory entries.
 940          * Find the one we're deleting.
 941          */
 942         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 943              i < sfp->hdr.count;
 944              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
 945                 if (sfep->namelen == args->namelen &&
 946                     sfep->name[0] == args->name[0] &&
 947                     memcmp(sfep->name, args->name, args->namelen) == 0) {
 948                         ASSERT(XFS_DIR2_SF_GET_INUMBER(sfp,
 949                                         XFS_DIR2_SF_INUMBERP(sfep)) ==
 950                                 args->inumber);
 951                         break;
 952                 }
 953         }
 954         /*
 955          * Didn't find it.
 956          */
 957         if (i == sfp->hdr.count) {
 958                 return XFS_ERROR(ENOENT);
 959         }
 960         /*
 961          * Calculate sizes.
 962          */
 963         byteoff = (int)((char *)sfep - (char *)sfp);
 964         entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen);
 965         newsize = oldsize - entsize;
 966         /*
 967          * Copy the part if any after the removed entry, sliding it down.
 968          */
 969         if (byteoff + entsize < oldsize)
 970                 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
 971                         oldsize - (byteoff + entsize));
 972         /*
 973          * Fix up the header and file size.
 974          */
 975         sfp->hdr.count--;
 976         dp->i_d.di_size = newsize;
 977         /*
 978          * Reallocate, making it smaller.
 979          */
 980         xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
 981         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 982 #if XFS_BIG_INUMS
 983         /*
 984          * Are we changing inode number size?
 985          */
 986         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
 987                 if (sfp->hdr.i8count == 1)
 988                         xfs_dir2_sf_toino4(args);
 989                 else
 990                         sfp->hdr.i8count--;
 991         }
 992 #endif
 993         xfs_dir2_sf_check(args);
 994         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 995         return 0;
 996 }
 997
 998 /*
 999  * Replace the inode number of an entry in a shortform directory.
1000  */
1001 int                                             /* error */
1002 xfs_dir2_sf_replace(
1003         xfs_da_args_t           *args)          /* operation arguments */
1004 {
1005         xfs_inode_t             *dp;            /* incore directory inode */
1006         int                     i;              /* entry index */
1007 #if XFS_BIG_INUMS || defined(DEBUG)
1008         xfs_ino_t               ino=0;          /* entry old inode number */
1009 #endif
1010 #if XFS_BIG_INUMS
1011         int                     i8elevated;     /* sf_toino8 set i8count=1 */
1012 #endif
1013         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
1014         xfs_dir2_sf_t           *sfp;           /* shortform structure */
1015
1016         xfs_dir2_trace_args("sf_replace", args);
1017         dp = args->dp;
1018
1019         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1020         /*
1021          * Bail out if the shortform directory is way too small.
1022          */
1023         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1024                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
1025                 return XFS_ERROR(EIO);
1026         }
1027         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1028         ASSERT(dp->i_df.if_u1.if_data != NULL);
1029         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1030         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
1031 #if XFS_BIG_INUMS
1032         /*
1033          * New inode number is large, and need to convert to 8-byte inodes.
1034          */
1035         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
1036                 int     error;                  /* error return value */
1037                 int     newsize;                /* new inode size */
1038
1039                 newsize =
1040                         dp->i_df.if_bytes +
1041                         (sfp->hdr.count + 1) *
1042                         ((uint)sizeof(xfs_dir2_ino8_t) -
1043                          (uint)sizeof(xfs_dir2_ino4_t));
1044                 /*
1045                  * Won't fit as shortform, convert to block then do replace.
1046                  */
1047                 if (newsize > XFS_IFORK_DSIZE(dp)) {
1048                         error = xfs_dir2_sf_to_block(args);
1049                         if (error) {
1050                                 return error;
1051                         }
1052                         return xfs_dir2_block_replace(args);
1053                 }
1054                 /*
1055                  * Still fits, convert to 8-byte now.
1056                  */
1057                 xfs_dir2_sf_toino8(args);
1058                 i8elevated = 1;
1059                 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1060         } else
1061                 i8elevated = 0;
1062 #endif
1063         ASSERT(args->namelen != 1 || args->name[0] != '.');
1064         /*
1065          * Replace ..'s entry.
1066          */
1067         if (args->namelen == 2 &&
1068             args->name[0] == '.' && args->name[1] == '.') {
1069 #if XFS_BIG_INUMS || defined(DEBUG)
1070                 ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
1071                 ASSERT(args->inumber != ino);
1072 #endif
1073                 XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, &sfp->hdr.parent);
1074         }
1075         /*
1076          * Normal entry, look for the name.
1077          */
1078         else {
1079                 for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
1080                      i < sfp->hdr.count;
1081                      i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
1082                         if (sfep->namelen == args->namelen &&
1083                             sfep->name[0] == args->name[0] &&
1084                             memcmp(args->name, sfep->name, args->namelen) == 0) {
1085 #if XFS_BIG_INUMS || defined(DEBUG)
1086                                 ino = XFS_DIR2_SF_GET_INUMBER(sfp,
1087                                         XFS_DIR2_SF_INUMBERP(sfep));
1088                                 ASSERT(args->inumber != ino);
1089 #endif
1090                                 XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber,
1091                                         XFS_DIR2_SF_INUMBERP(sfep));
1092                                 break;
1093                         }
1094                 }
1095                 /*
1096                  * Didn't find it.
1097                  */
1098                 if (i == sfp->hdr.count) {
1099                         ASSERT(args->oknoent);
1100 #if XFS_BIG_INUMS
1101                         if (i8elevated)
1102                                 xfs_dir2_sf_toino4(args);
1103 #endif
1104                         return XFS_ERROR(ENOENT);
1105                 }
1106         }
1107 #if XFS_BIG_INUMS
1108         /*
1109          * See if the old number was large, the new number is small.
1110          */
1111         if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1112             args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1113                 /*
1114                  * And the old count was one, so need to convert to small.
1115                  */
1116                 if (sfp->hdr.i8count == 1)
1117                         xfs_dir2_sf_toino4(args);
1118                 else
1119                         sfp->hdr.i8count--;
1120         }
1121         /*
1122          * See if the old number was small, the new number is large.
1123          */
1124         if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1125             args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1126                 /*
1127                  * add to the i8count unless we just converted to 8-byte
1128                  * inodes (which does an implied i8count = 1)
1129                  */
1130                 ASSERT(sfp->hdr.i8count != 0);
1131                 if (!i8elevated)
1132                         sfp->hdr.i8count++;
1133         }
1134 #endif
1135         xfs_dir2_sf_check(args);
1136         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1137         return 0;
1138 }
1139
1140 #if XFS_BIG_INUMS
1141 /*
1142  * Convert from 8-byte inode numbers to 4-byte inode numbers.
1143  * The last 8-byte inode number is gone, but the count is still 1.
1144  */
1145 static void
1146 xfs_dir2_sf_toino4(
1147         xfs_da_args_t           *args)          /* operation arguments */
1148 {
1149         char                    *buf;           /* old dir's buffer */
1150         xfs_inode_t             *dp;            /* incore directory inode */
1151         int                     i;              /* entry index */
1152         xfs_ino_t               ino;            /* entry inode number */
1153         int                     newsize;        /* new inode size */
1154         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1155         xfs_dir2_sf_t           *oldsfp;        /* old sf directory */
1156         int                     oldsize;        /* old inode size */
1157         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1158         xfs_dir2_sf_t           *sfp;           /* new sf directory */
1159
1160         xfs_dir2_trace_args("sf_toino4", args);
1161         dp = args->dp;
1162
1163         /*
1164          * Copy the old directory to the buffer.
1165          * Then nuke it from the inode, and add the new buffer to the inode.
1166          * Don't want xfs_idata_realloc copying the data here.
1167          */
1168         oldsize = dp->i_df.if_bytes;
1169         buf = kmem_alloc(oldsize, KM_SLEEP);
1170         oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1171         ASSERT(oldsfp->hdr.i8count == 1);
1172         memcpy(buf, oldsfp, oldsize);
1173         /*
1174          * Compute the new inode size.
1175          */
1176         newsize =
1177                 oldsize -
1178                 (oldsfp->hdr.count + 1) *
1179                 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1180         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1181         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1182         /*
1183          * Reset our pointers, the data has moved.
1184          */
1185         oldsfp = (xfs_dir2_sf_t *)buf;
1186         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1187         /*
1188          * Fill in the new header.
1189          */
1190         sfp->hdr.count = oldsfp->hdr.count;
1191         sfp->hdr.i8count = 0;
1192         ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent);
1193         XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent);
1194         /*
1195          * Copy the entries field by field.
1196          */
1197         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp),
1198                     oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp);
1199              i < sfp->hdr.count;
1200              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep),
1201                   oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) {
1202                 sfep->namelen = oldsfep->namelen;
1203                 sfep->offset = oldsfep->offset;
1204                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1205                 ino = XFS_DIR2_SF_GET_INUMBER(oldsfp,
1206                         XFS_DIR2_SF_INUMBERP(oldsfep));
1207                 XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep));
1208         }
1209         /*
1210          * Clean up the inode.
1211          */
1212         kmem_free(buf, oldsize);
1213         dp->i_d.di_size = newsize;
1214         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1215 }
1216
1217 /*
1218  * Convert from 4-byte inode numbers to 8-byte inode numbers.
1219  * The new 8-byte inode number is not there yet, we leave with the
1220  * count 1 but no corresponding entry.
1221  */
1222 static void
1223 xfs_dir2_sf_toino8(
1224         xfs_da_args_t           *args)          /* operation arguments */
1225 {
1226         char                    *buf;           /* old dir's buffer */
1227         xfs_inode_t             *dp;            /* incore directory inode */
1228         int                     i;              /* entry index */
1229         xfs_ino_t               ino;            /* entry inode number */
1230         int                     newsize;        /* new inode size */
1231         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1232         xfs_dir2_sf_t           *oldsfp;        /* old sf directory */
1233         int                     oldsize;        /* old inode size */
1234         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1235         xfs_dir2_sf_t           *sfp;           /* new sf directory */
1236
1237         xfs_dir2_trace_args("sf_toino8", args);
1238         dp = args->dp;
1239
1240         /*
1241          * Copy the old directory to the buffer.
1242          * Then nuke it from the inode, and add the new buffer to the inode.
1243          * Don't want xfs_idata_realloc copying the data here.
1244          */
1245         oldsize = dp->i_df.if_bytes;
1246         buf = kmem_alloc(oldsize, KM_SLEEP);
1247         oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1248         ASSERT(oldsfp->hdr.i8count == 0);
1249         memcpy(buf, oldsfp, oldsize);
1250         /*
1251          * Compute the new inode size.
1252          */
1253         newsize =
1254                 oldsize +
1255                 (oldsfp->hdr.count + 1) *
1256                 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1257         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1258         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1259         /*
1260          * Reset our pointers, the data has moved.
1261          */
1262         oldsfp = (xfs_dir2_sf_t *)buf;
1263         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1264         /*
1265          * Fill in the new header.
1266          */
1267         sfp->hdr.count = oldsfp->hdr.count;
1268         sfp->hdr.i8count = 1;
1269         ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent);
1270         XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent);
1271         /*
1272          * Copy the entries field by field.
1273          */
1274         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp),
1275                     oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp);
1276              i < sfp->hdr.count;
1277              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep),
1278                   oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) {
1279                 sfep->namelen = oldsfep->namelen;
1280                 sfep->offset = oldsfep->offset;
1281                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1282                 ino = XFS_DIR2_SF_GET_INUMBER(oldsfp,
1283                         XFS_DIR2_SF_INUMBERP(oldsfep));
1284                 XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep));
1285         }
1286         /*
1287          * Clean up the inode.
1288          */
1289         kmem_free(buf, oldsize);
1290         dp->i_d.di_size = newsize;
1291         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1292 }
1293 #endif  /* XFS_BIG_INUMS */