fs/xfs/libxfs/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_format.h"
  21 #include "xfs_log_format.h"
  22 #include "xfs_trans_resv.h"
  23 #include "xfs_mount.h"
  24 #include "xfs_da_format.h"
  25 #include "xfs_da_btree.h"
  26 #include "xfs_inode.h"
  27 #include "xfs_trans.h"
  28 #include "xfs_inode_item.h"
  29 #include "xfs_error.h"
  30 #include "xfs_dir2.h"
  31 #include "xfs_dir2_priv.h"
  32 #include "xfs_trace.h"
  33
  34 /*
  35  * Prototypes for internal functions.
  36  */
  37 static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
  38                                      xfs_dir2_sf_entry_t *sfep,
  39                                      xfs_dir2_data_aoff_t offset,
  40                                      int new_isize);
  41 static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
  42                                      int new_isize);
  43 static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
  44                                     xfs_dir2_sf_entry_t **sfepp,
  45                                     xfs_dir2_data_aoff_t *offsetp);
  46 #ifdef DEBUG
  47 static void xfs_dir2_sf_check(xfs_da_args_t *args);
  48 #else
  49 #define xfs_dir2_sf_check(args)
  50 #endif /* DEBUG */
  51
  52 static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
  53 static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
  54
  55 /*
  56  * Given a block directory (dp/block), calculate its size as a shortform (sf)
  57  * directory and a header for the sf directory, if it will fit it the
  58  * space currently present in the inode.  If it won't fit, the output
  59  * size is too big (but not accurate).
  60  */
  61 int                                             /* size for sf form */
  62 xfs_dir2_block_sfsize(
  63         xfs_inode_t             *dp,            /* incore inode pointer */
  64         xfs_dir2_data_hdr_t     *hdr,           /* block directory data */
  65         xfs_dir2_sf_hdr_t       *sfhp)          /* output: header for sf form */
  66 {
  67         xfs_dir2_dataptr_t      addr;           /* data entry address */
  68         xfs_dir2_leaf_entry_t   *blp;           /* leaf area of the block */
  69         xfs_dir2_block_tail_t   *btp;           /* tail area of the block */
  70         int                     count;          /* shortform entry count */
  71         xfs_dir2_data_entry_t   *dep;           /* data entry in the block */
  72         int                     i;              /* block entry index */
  73         int                     i8count;        /* count of big-inode entries */
  74         int                     isdot;          /* entry is "." */
  75         int                     isdotdot;       /* entry is ".." */
  76         xfs_mount_t             *mp;            /* mount structure pointer */
  77         int                     namelen;        /* total name bytes */
  78         xfs_ino_t               parent = 0;     /* parent inode number */
  79         int                     size=0;         /* total computed size */
  80         int                     has_ftype;
  81         struct xfs_da_geometry  *geo;
  82
  83         mp = dp->i_mount;
  84         geo = mp->m_dir_geo;
  85
  86         /*
  87          * if there is a filetype field, add the extra byte to the namelen
  88          * for each entry that we see.
  89          */
  90         has_ftype = xfs_sb_version_hasftype(&mp->m_sb) ? 1 : 0;
  91
  92         count = i8count = namelen = 0;
  93         btp = xfs_dir2_block_tail_p(geo, hdr);
  94         blp = xfs_dir2_block_leaf_p(btp);
  95
  96         /*
  97          * Iterate over the block's data entries by using the leaf pointers.
  98          */
  99         for (i = 0; i < be32_to_cpu(btp->count); i++) {
 100                 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
 101                         continue;
 102                 /*
 103                  * Calculate the pointer to the entry at hand.
 104                  */
 105                 dep = (xfs_dir2_data_entry_t *)((char *)hdr +
 106                                 xfs_dir2_dataptr_to_off(geo, addr));
 107                 /*
 108                  * Detect . and .., so we can special-case them.
 109                  * . is not included in sf directories.
 110                  * .. is included by just the parent inode number.
 111                  */
 112                 isdot = dep->namelen == 1 && dep->name[0] == '.';
 113                 isdotdot =
 114                         dep->namelen == 2 &&
 115                         dep->name[0] == '.' && dep->name[1] == '.';
 116
 117                 if (!isdot)
 118                         i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
 119
 120                 /* take into account the file type field */
 121                 if (!isdot && !isdotdot) {
 122                         count++;
 123                         namelen += dep->namelen + has_ftype;
 124                 } else if (isdotdot)
 125                         parent = be64_to_cpu(dep->inumber);
 126                 /*
 127                  * Calculate the new size, see if we should give up yet.
 128                  */
 129                 size = xfs_dir2_sf_hdr_size(i8count) +  /* header */
 130                        count * 3 * sizeof(u8) +         /* namelen + offset */
 131                        namelen +                        /* name */
 132                        (i8count ?                       /* inumber */
 133                                 count * XFS_INO64_SIZE :
 134                                 count * XFS_INO32_SIZE);
 135                 if (size > XFS_IFORK_DSIZE(dp))
 136                         return size;            /* size value is a failure */
 137         }
 138         /*
 139          * Create the output header, if it worked.
 140          */
 141         sfhp->count = count;
 142         sfhp->i8count = i8count;
 143         dp->d_ops->sf_put_parent_ino(sfhp, parent);
 144         return size;
 145 }
 146
 147 /*
 148  * Convert a block format directory to shortform.
 149  * Caller has already checked that it will fit, and built us a header.
 150  */
 151 int                                             /* error */
 152 xfs_dir2_block_to_sf(
 153         xfs_da_args_t           *args,          /* operation arguments */
 154         struct xfs_buf          *bp,
 155         int                     size,           /* shortform directory size */
 156         xfs_dir2_sf_hdr_t       *sfhp)          /* shortform directory hdr */
 157 {
 158         xfs_dir2_data_hdr_t     *hdr;           /* block header */
 159         xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
 160         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
 161         xfs_inode_t             *dp;            /* incore directory inode */
 162         xfs_dir2_data_unused_t  *dup;           /* unused data pointer */
 163         char                    *endptr;        /* end of data entries */
 164         int                     error;          /* error return value */
 165         int                     logflags;       /* inode logging flags */
 166         xfs_mount_t             *mp;            /* filesystem mount point */
 167         char                    *ptr;           /* current data pointer */
 168         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 169         xfs_dir2_sf_hdr_t       *sfp;           /* shortform directory header */
 170         xfs_dir2_sf_hdr_t       *dst;           /* temporary data buffer */
 171
 172         trace_xfs_dir2_block_to_sf(args);
 173
 174         dp = args->dp;
 175         mp = dp->i_mount;
 176
 177         /*
 178          * allocate a temporary destination buffer the size of the inode
 179          * to format the data into. Once we have formatted the data, we
 180          * can free the block and copy the formatted data into the inode literal
 181          * area.
 182          */
 183         dst = kmem_alloc(mp->m_sb.sb_inodesize, KM_SLEEP);
 184         hdr = bp->b_addr;
 185
 186         /*
 187          * Copy the header into the newly allocate local space.
 188          */
 189         sfp = (xfs_dir2_sf_hdr_t *)dst;
 190         memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
 191
 192         /*
 193          * Set up to loop over the block's entries.
 194          */
 195         btp = xfs_dir2_block_tail_p(args->geo, hdr);
 196         ptr = (char *)dp->d_ops->data_entry_p(hdr);
 197         endptr = (char *)xfs_dir2_block_leaf_p(btp);
 198         sfep = xfs_dir2_sf_firstentry(sfp);
 199         /*
 200          * Loop over the active and unused entries.
 201          * Stop when we reach the leaf/tail portion of the block.
 202          */
 203         while (ptr < endptr) {
 204                 /*
 205                  * If it's unused, just skip over it.
 206                  */
 207                 dup = (xfs_dir2_data_unused_t *)ptr;
 208                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 209                         ptr += be16_to_cpu(dup->length);
 210                         continue;
 211                 }
 212                 dep = (xfs_dir2_data_entry_t *)ptr;
 213                 /*
 214                  * Skip .
 215                  */
 216                 if (dep->namelen == 1 && dep->name[0] == '.')
 217                         ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
 218                 /*
 219                  * Skip .., but make sure the inode number is right.
 220                  */
 221                 else if (dep->namelen == 2 &&
 222                          dep->name[0] == '.' && dep->name[1] == '.')
 223                         ASSERT(be64_to_cpu(dep->inumber) ==
 224                                dp->d_ops->sf_get_parent_ino(sfp));
 225                 /*
 226                  * Normal entry, copy it into shortform.
 227                  */
 228                 else {
 229                         sfep->namelen = dep->namelen;
 230                         xfs_dir2_sf_put_offset(sfep,
 231                                 (xfs_dir2_data_aoff_t)
 232                                 ((char *)dep - (char *)hdr));
 233                         memcpy(sfep->name, dep->name, dep->namelen);
 234                         dp->d_ops->sf_put_ino(sfp, sfep,
 235                                               be64_to_cpu(dep->inumber));
 236                         dp->d_ops->sf_put_ftype(sfep,
 237                                         dp->d_ops->data_get_ftype(dep));
 238
 239                         sfep = dp->d_ops->sf_nextentry(sfp, sfep);
 240                 }
 241                 ptr += dp->d_ops->data_entsize(dep->namelen);
 242         }
 243         ASSERT((char *)sfep - (char *)sfp == size);
 244
 245         /* now we are done with the block, we can shrink the inode */
 246         logflags = XFS_ILOG_CORE;
 247         error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp);
 248         if (error) {
 249                 ASSERT(error != -ENOSPC);
 250                 goto out;
 251         }
 252
 253         /*
 254          * The buffer is now unconditionally gone, whether
 255          * xfs_dir2_shrink_inode worked or not.
 256          *
 257          * Convert the inode to local format and copy the data in.
 258          */
 259         ASSERT(dp->i_df.if_bytes == 0);
 260         xfs_init_local_fork(dp, XFS_DATA_FORK, dst, size);
 261         dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 262         dp->i_d.di_size = size;
 263
 264         logflags |= XFS_ILOG_DDATA;
 265         xfs_dir2_sf_check(args);
 266 out:
 267         xfs_trans_log_inode(args->trans, dp, logflags);
 268         kmem_free(dst);
 269         return error;
 270 }
 271
 272 /*
 273  * Add a name to a shortform directory.
 274  * There are two algorithms, "easy" and "hard" which we decide on
 275  * before changing anything.
 276  * Convert to block form if necessary, if the new entry won't fit.
 277  */
 278 int                                             /* error */
 279 xfs_dir2_sf_addname(
 280         xfs_da_args_t           *args)          /* operation arguments */
 281 {
 282         xfs_inode_t             *dp;            /* incore directory inode */
 283         int                     error;          /* error return value */
 284         int                     incr_isize;     /* total change in size */
 285         int                     new_isize;      /* di_size after adding name */
 286         int                     objchange;      /* changing to 8-byte inodes */
 287         xfs_dir2_data_aoff_t    offset = 0;     /* offset for new entry */
 288         int                     pick;           /* which algorithm to use */
 289         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 290         xfs_dir2_sf_entry_t     *sfep = NULL;   /* shortform entry */
 291
 292         trace_xfs_dir2_sf_addname(args);
 293
 294         ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
 295         dp = args->dp;
 296         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 297         /*
 298          * Make sure the shortform value has some of its header.
 299          */
 300         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 301                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 302                 return -EIO;
 303         }
 304         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 305         ASSERT(dp->i_df.if_u1.if_data != NULL);
 306         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 307         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 308         /*
 309          * Compute entry (and change in) size.
 310          */
 311         incr_isize = dp->d_ops->sf_entsize(sfp, args->namelen);
 312         objchange = 0;
 313
 314         /*
 315          * Do we have to change to 8 byte inodes?
 316          */
 317         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
 318                 /*
 319                  * Yes, adjust the inode size.  old count + (parent + new)
 320                  */
 321                 incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
 322                 objchange = 1;
 323         }
 324
 325         new_isize = (int)dp->i_d.di_size + incr_isize;
 326         /*
 327          * Won't fit as shortform any more (due to size),
 328          * or the pick routine says it won't (due to offset values).
 329          */
 330         if (new_isize > XFS_IFORK_DSIZE(dp) ||
 331             (pick =
 332              xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
 333                 /*
 334                  * Just checking or no space reservation, it doesn't fit.
 335                  */
 336                 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
 337                         return -ENOSPC;
 338                 /*
 339                  * Convert to block form then add the name.
 340                  */
 341                 error = xfs_dir2_sf_to_block(args);
 342                 if (error)
 343                         return error;
 344                 return xfs_dir2_block_addname(args);
 345         }
 346         /*
 347          * Just checking, it fits.
 348          */
 349         if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 350                 return 0;
 351         /*
 352          * Do it the easy way - just add it at the end.
 353          */
 354         if (pick == 1)
 355                 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
 356         /*
 357          * Do it the hard way - look for a place to insert the new entry.
 358          * Convert to 8 byte inode numbers first if necessary.
 359          */
 360         else {
 361                 ASSERT(pick == 2);
 362                 if (objchange)
 363                         xfs_dir2_sf_toino8(args);
 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_hdr_t       *sfp;           /* shortform structure */
 387
 388         dp = args->dp;
 389
 390         sfp = (xfs_dir2_sf_hdr_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, dp->d_ops->sf_entsize(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_hdr_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         dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
 409         dp->d_ops->sf_put_ftype(sfep, args->filetype);
 410
 411         /*
 412          * Update the header and inode.
 413          */
 414         sfp->count++;
 415         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
 416                 sfp->i8count++;
 417         dp->i_d.di_size = new_isize;
 418         xfs_dir2_sf_check(args);
 419 }
 420
 421 /*
 422  * Add the new entry the "hard" way.
 423  * The caller has already converted to 8 byte inode numbers if necessary,
 424  * in which case we need to leave the i8count at 1.
 425  * Find a hole that the new entry will fit into, and copy
 426  * the first part of the entries, the new entry, and the last part of
 427  * the entries.
 428  */
 429 /* ARGSUSED */
 430 static void
 431 xfs_dir2_sf_addname_hard(
 432         xfs_da_args_t           *args,          /* operation arguments */
 433         int                     objchange,      /* changing inode number size */
 434         int                     new_isize)      /* new directory size */
 435 {
 436         int                     add_datasize;   /* data size need for new ent */
 437         char                    *buf;           /* buffer for old */
 438         xfs_inode_t             *dp;            /* incore directory inode */
 439         int                     eof;            /* reached end of old dir */
 440         int                     nbytes;         /* temp for byte copies */
 441         xfs_dir2_data_aoff_t    new_offset;     /* next offset value */
 442         xfs_dir2_data_aoff_t    offset;         /* current offset value */
 443         int                     old_isize;      /* previous di_size */
 444         xfs_dir2_sf_entry_t     *oldsfep;       /* entry in original dir */
 445         xfs_dir2_sf_hdr_t       *oldsfp;        /* original shortform dir */
 446         xfs_dir2_sf_entry_t     *sfep;          /* entry in new dir */
 447         xfs_dir2_sf_hdr_t       *sfp;           /* new shortform dir */
 448
 449         /*
 450          * Copy the old directory to the stack buffer.
 451          */
 452         dp = args->dp;
 453
 454         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 455         old_isize = (int)dp->i_d.di_size;
 456         buf = kmem_alloc(old_isize, KM_SLEEP);
 457         oldsfp = (xfs_dir2_sf_hdr_t *)buf;
 458         memcpy(oldsfp, sfp, old_isize);
 459         /*
 460          * Loop over the old directory finding the place we're going
 461          * to insert the new entry.
 462          * If it's going to end up at the end then oldsfep will point there.
 463          */
 464         for (offset = dp->d_ops->data_first_offset,
 465               oldsfep = xfs_dir2_sf_firstentry(oldsfp),
 466               add_datasize = dp->d_ops->data_entsize(args->namelen),
 467               eof = (char *)oldsfep == &buf[old_isize];
 468              !eof;
 469              offset = new_offset + dp->d_ops->data_entsize(oldsfep->namelen),
 470               oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep),
 471               eof = (char *)oldsfep == &buf[old_isize]) {
 472                 new_offset = xfs_dir2_sf_get_offset(oldsfep);
 473                 if (offset + add_datasize <= new_offset)
 474                         break;
 475         }
 476         /*
 477          * Get rid of the old directory, then allocate space for
 478          * the new one.  We do this so xfs_idata_realloc won't copy
 479          * the data.
 480          */
 481         xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
 482         xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
 483         /*
 484          * Reset the pointer since the buffer was reallocated.
 485          */
 486         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 487         /*
 488          * Copy the first part of the directory, including the header.
 489          */
 490         nbytes = (int)((char *)oldsfep - (char *)oldsfp);
 491         memcpy(sfp, oldsfp, nbytes);
 492         sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
 493         /*
 494          * Fill in the new entry, and update the header counts.
 495          */
 496         sfep->namelen = args->namelen;
 497         xfs_dir2_sf_put_offset(sfep, offset);
 498         memcpy(sfep->name, args->name, sfep->namelen);
 499         dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
 500         dp->d_ops->sf_put_ftype(sfep, args->filetype);
 501         sfp->count++;
 502         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
 503                 sfp->i8count++;
 504         /*
 505          * If there's more left to copy, do that.
 506          */
 507         if (!eof) {
 508                 sfep = dp->d_ops->sf_nextentry(sfp, sfep);
 509                 memcpy(sfep, oldsfep, old_isize - nbytes);
 510         }
 511         kmem_free(buf);
 512         dp->i_d.di_size = new_isize;
 513         xfs_dir2_sf_check(args);
 514 }
 515
 516 /*
 517  * Decide if the new entry will fit at all.
 518  * If it will fit, pick between adding the new entry to the end (easy)
 519  * or somewhere else (hard).
 520  * Return 0 (won't fit), 1 (easy), 2 (hard).
 521  */
 522 /*ARGSUSED*/
 523 static int                                      /* pick result */
 524 xfs_dir2_sf_addname_pick(
 525         xfs_da_args_t           *args,          /* operation arguments */
 526         int                     objchange,      /* inode # size changes */
 527         xfs_dir2_sf_entry_t     **sfepp,        /* out(1): new entry ptr */
 528         xfs_dir2_data_aoff_t    *offsetp)       /* out(1): new offset */
 529 {
 530         xfs_inode_t             *dp;            /* incore directory inode */
 531         int                     holefit;        /* found hole it will fit in */
 532         int                     i;              /* entry number */
 533         xfs_dir2_data_aoff_t    offset;         /* data block offset */
 534         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 535         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 536         int                     size;           /* entry's data size */
 537         int                     used;           /* data bytes used */
 538
 539         dp = args->dp;
 540
 541         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 542         size = dp->d_ops->data_entsize(args->namelen);
 543         offset = dp->d_ops->data_first_offset;
 544         sfep = xfs_dir2_sf_firstentry(sfp);
 545         holefit = 0;
 546         /*
 547          * Loop over sf entries.
 548          * Keep track of data offset and whether we've seen a place
 549          * to insert the new entry.
 550          */
 551         for (i = 0; i < sfp->count; i++) {
 552                 if (!holefit)
 553                         holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
 554                 offset = xfs_dir2_sf_get_offset(sfep) +
 555                          dp->d_ops->data_entsize(sfep->namelen);
 556                 sfep = dp->d_ops->sf_nextentry(sfp, sfep);
 557         }
 558         /*
 559          * Calculate data bytes used excluding the new entry, if this
 560          * was a data block (block form directory).
 561          */
 562         used = offset +
 563                (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 564                (uint)sizeof(xfs_dir2_block_tail_t);
 565         /*
 566          * If it won't fit in a block form then we can't insert it,
 567          * we'll go back, convert to block, then try the insert and convert
 568          * to leaf.
 569          */
 570         if (used + (holefit ? 0 : size) > args->geo->blksize)
 571                 return 0;
 572         /*
 573          * If changing the inode number size, do it the hard way.
 574          */
 575         if (objchange)
 576                 return 2;
 577         /*
 578          * If it won't fit at the end then do it the hard way (use the hole).
 579          */
 580         if (used + size > args->geo->blksize)
 581                 return 2;
 582         /*
 583          * Do it the easy way.
 584          */
 585         *sfepp = sfep;
 586         *offsetp = offset;
 587         return 1;
 588 }
 589
 590 #ifdef DEBUG
 591 /*
 592  * Check consistency of shortform directory, assert if bad.
 593  */
 594 static void
 595 xfs_dir2_sf_check(
 596         xfs_da_args_t           *args)          /* operation arguments */
 597 {
 598         xfs_inode_t             *dp;            /* incore directory inode */
 599         int                     i;              /* entry number */
 600         int                     i8count;        /* number of big inode#s */
 601         xfs_ino_t               ino;            /* entry inode number */
 602         int                     offset;         /* data offset */
 603         xfs_dir2_sf_entry_t     *sfep;          /* shortform dir entry */
 604         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 605
 606         dp = args->dp;
 607
 608         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 609         offset = dp->d_ops->data_first_offset;
 610         ino = dp->d_ops->sf_get_parent_ino(sfp);
 611         i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 612
 613         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
 614              i < sfp->count;
 615              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 616                 ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
 617                 ino = dp->d_ops->sf_get_ino(sfp, sfep);
 618                 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 619                 offset =
 620                         xfs_dir2_sf_get_offset(sfep) +
 621                         dp->d_ops->data_entsize(sfep->namelen);
 622                 ASSERT(dp->d_ops->sf_get_ftype(sfep) < XFS_DIR3_FT_MAX);
 623         }
 624         ASSERT(i8count == sfp->i8count);
 625         ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
 626         ASSERT(offset +
 627                (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 628                (uint)sizeof(xfs_dir2_block_tail_t) <= args->geo->blksize);
 629 }
 630 #endif  /* DEBUG */
 631
 632 /*
 633  * Create a new (shortform) directory.
 634  */
 635 int                                     /* error, always 0 */
 636 xfs_dir2_sf_create(
 637         xfs_da_args_t   *args,          /* operation arguments */
 638         xfs_ino_t       pino)           /* parent inode number */
 639 {
 640         xfs_inode_t     *dp;            /* incore directory inode */
 641         int             i8count;        /* parent inode is an 8-byte number */
 642         xfs_dir2_sf_hdr_t *sfp;         /* shortform structure */
 643         int             size;           /* directory size */
 644
 645         trace_xfs_dir2_sf_create(args);
 646
 647         dp = args->dp;
 648
 649         ASSERT(dp != NULL);
 650         ASSERT(dp->i_d.di_size == 0);
 651         /*
 652          * If it's currently a zero-length extent file,
 653          * convert it to local format.
 654          */
 655         if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
 656                 dp->i_df.if_flags &= ~XFS_IFEXTENTS;    /* just in case */
 657                 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 658                 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
 659                 dp->i_df.if_flags |= XFS_IFINLINE;
 660         }
 661         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 662         ASSERT(dp->i_df.if_bytes == 0);
 663         i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
 664         size = xfs_dir2_sf_hdr_size(i8count);
 665         /*
 666          * Make a buffer for the data.
 667          */
 668         xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 669         /*
 670          * Fill in the header,
 671          */
 672         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 673         sfp->i8count = i8count;
 674         /*
 675          * Now can put in the inode number, since i8count is set.
 676          */
 677         dp->d_ops->sf_put_parent_ino(sfp, pino);
 678         sfp->count = 0;
 679         dp->i_d.di_size = size;
 680         xfs_dir2_sf_check(args);
 681         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 682         return 0;
 683 }
 684
 685 /*
 686  * Lookup an entry in a shortform directory.
 687  * Returns EEXIST if found, ENOENT if not found.
 688  */
 689 int                                             /* error */
 690 xfs_dir2_sf_lookup(
 691         xfs_da_args_t           *args)          /* operation arguments */
 692 {
 693         xfs_inode_t             *dp;            /* incore directory inode */
 694         int                     i;              /* entry index */
 695         int                     error;
 696         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 697         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 698         enum xfs_dacmp          cmp;            /* comparison result */
 699         xfs_dir2_sf_entry_t     *ci_sfep;       /* case-insens. entry */
 700
 701         trace_xfs_dir2_sf_lookup(args);
 702
 703         xfs_dir2_sf_check(args);
 704         dp = args->dp;
 705
 706         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 707         /*
 708          * Bail out if the directory is way too short.
 709          */
 710         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 711                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 712                 return -EIO;
 713         }
 714         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 715         ASSERT(dp->i_df.if_u1.if_data != NULL);
 716         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 717         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 718         /*
 719          * Special case for .
 720          */
 721         if (args->namelen == 1 && args->name[0] == '.') {
 722                 args->inumber = dp->i_ino;
 723                 args->cmpresult = XFS_CMP_EXACT;
 724                 args->filetype = XFS_DIR3_FT_DIR;
 725                 return -EEXIST;
 726         }
 727         /*
 728          * Special case for ..
 729          */
 730         if (args->namelen == 2 &&
 731             args->name[0] == '.' && args->name[1] == '.') {
 732                 args->inumber = dp->d_ops->sf_get_parent_ino(sfp);
 733                 args->cmpresult = XFS_CMP_EXACT;
 734                 args->filetype = XFS_DIR3_FT_DIR;
 735                 return -EEXIST;
 736         }
 737         /*
 738          * Loop over all the entries trying to match ours.
 739          */
 740         ci_sfep = NULL;
 741         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 742              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 743                 /*
 744                  * Compare name and if it's an exact match, return the inode
 745                  * number. If it's the first case-insensitive match, store the
 746                  * inode number and continue looking for an exact match.
 747                  */
 748                 cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
 749                                                                 sfep->namelen);
 750                 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
 751                         args->cmpresult = cmp;
 752                         args->inumber = dp->d_ops->sf_get_ino(sfp, sfep);
 753                         args->filetype = dp->d_ops->sf_get_ftype(sfep);
 754                         if (cmp == XFS_CMP_EXACT)
 755                                 return -EEXIST;
 756                         ci_sfep = sfep;
 757                 }
 758         }
 759         ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 760         /*
 761          * Here, we can only be doing a lookup (not a rename or replace).
 762          * If a case-insensitive match was not found, return -ENOENT.
 763          */
 764         if (!ci_sfep)
 765                 return -ENOENT;
 766         /* otherwise process the CI match as required by the caller */
 767         error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
 768         return error;
 769 }
 770
 771 /*
 772  * Remove an entry from a shortform directory.
 773  */
 774 int                                             /* error */
 775 xfs_dir2_sf_removename(
 776         xfs_da_args_t           *args)
 777 {
 778         int                     byteoff;        /* offset of removed entry */
 779         xfs_inode_t             *dp;            /* incore directory inode */
 780         int                     entsize;        /* this entry's size */
 781         int                     i;              /* shortform entry index */
 782         int                     newsize;        /* new inode size */
 783         int                     oldsize;        /* old inode size */
 784         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 785         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 786
 787         trace_xfs_dir2_sf_removename(args);
 788
 789         dp = args->dp;
 790
 791         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 792         oldsize = (int)dp->i_d.di_size;
 793         /*
 794          * Bail out if the directory is way too short.
 795          */
 796         if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 797                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 798                 return -EIO;
 799         }
 800         ASSERT(dp->i_df.if_bytes == oldsize);
 801         ASSERT(dp->i_df.if_u1.if_data != NULL);
 802         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 803         ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
 804         /*
 805          * Loop over the old directory entries.
 806          * Find the one we're deleting.
 807          */
 808         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 809              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 810                 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
 811                                                                 XFS_CMP_EXACT) {
 812                         ASSERT(dp->d_ops->sf_get_ino(sfp, sfep) ==
 813                                args->inumber);
 814                         break;
 815                 }
 816         }
 817         /*
 818          * Didn't find it.
 819          */
 820         if (i == sfp->count)
 821                 return -ENOENT;
 822         /*
 823          * Calculate sizes.
 824          */
 825         byteoff = (int)((char *)sfep - (char *)sfp);
 826         entsize = dp->d_ops->sf_entsize(sfp, args->namelen);
 827         newsize = oldsize - entsize;
 828         /*
 829          * Copy the part if any after the removed entry, sliding it down.
 830          */
 831         if (byteoff + entsize < oldsize)
 832                 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
 833                         oldsize - (byteoff + entsize));
 834         /*
 835          * Fix up the header and file size.
 836          */
 837         sfp->count--;
 838         dp->i_d.di_size = newsize;
 839         /*
 840          * Reallocate, making it smaller.
 841          */
 842         xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
 843         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 844         /*
 845          * Are we changing inode number size?
 846          */
 847         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
 848                 if (sfp->i8count == 1)
 849                         xfs_dir2_sf_toino4(args);
 850                 else
 851                         sfp->i8count--;
 852         }
 853         xfs_dir2_sf_check(args);
 854         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 855         return 0;
 856 }
 857
 858 /*
 859  * Replace the inode number of an entry in a shortform directory.
 860  */
 861 int                                             /* error */
 862 xfs_dir2_sf_replace(
 863         xfs_da_args_t           *args)          /* operation arguments */
 864 {
 865         xfs_inode_t             *dp;            /* incore directory inode */
 866         int                     i;              /* entry index */
 867         xfs_ino_t               ino=0;          /* entry old inode number */
 868         int                     i8elevated;     /* sf_toino8 set i8count=1 */
 869         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 870         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 871
 872         trace_xfs_dir2_sf_replace(args);
 873
 874         dp = args->dp;
 875
 876         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 877         /*
 878          * Bail out if the shortform directory is way too small.
 879          */
 880         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 881                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 882                 return -EIO;
 883         }
 884         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 885         ASSERT(dp->i_df.if_u1.if_data != NULL);
 886         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 887         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 888
 889         /*
 890          * New inode number is large, and need to convert to 8-byte inodes.
 891          */
 892         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
 893                 int     error;                  /* error return value */
 894                 int     newsize;                /* new inode size */
 895
 896                 newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
 897                 /*
 898                  * Won't fit as shortform, convert to block then do replace.
 899                  */
 900                 if (newsize > XFS_IFORK_DSIZE(dp)) {
 901                         error = xfs_dir2_sf_to_block(args);
 902                         if (error) {
 903                                 return error;
 904                         }
 905                         return xfs_dir2_block_replace(args);
 906                 }
 907                 /*
 908                  * Still fits, convert to 8-byte now.
 909                  */
 910                 xfs_dir2_sf_toino8(args);
 911                 i8elevated = 1;
 912                 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 913         } else
 914                 i8elevated = 0;
 915
 916         ASSERT(args->namelen != 1 || args->name[0] != '.');
 917         /*
 918          * Replace ..'s entry.
 919          */
 920         if (args->namelen == 2 &&
 921             args->name[0] == '.' && args->name[1] == '.') {
 922                 ino = dp->d_ops->sf_get_parent_ino(sfp);
 923                 ASSERT(args->inumber != ino);
 924                 dp->d_ops->sf_put_parent_ino(sfp, args->inumber);
 925         }
 926         /*
 927          * Normal entry, look for the name.
 928          */
 929         else {
 930                 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 931                      i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 932                         if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
 933                                                                 XFS_CMP_EXACT) {
 934                                 ino = dp->d_ops->sf_get_ino(sfp, sfep);
 935                                 ASSERT(args->inumber != ino);
 936                                 dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
 937                                 dp->d_ops->sf_put_ftype(sfep, args->filetype);
 938                                 break;
 939                         }
 940                 }
 941                 /*
 942                  * Didn't find it.
 943                  */
 944                 if (i == sfp->count) {
 945                         ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 946                         if (i8elevated)
 947                                 xfs_dir2_sf_toino4(args);
 948                         return -ENOENT;
 949                 }
 950         }
 951         /*
 952          * See if the old number was large, the new number is small.
 953          */
 954         if (ino > XFS_DIR2_MAX_SHORT_INUM &&
 955             args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
 956                 /*
 957                  * And the old count was one, so need to convert to small.
 958                  */
 959                 if (sfp->i8count == 1)
 960                         xfs_dir2_sf_toino4(args);
 961                 else
 962                         sfp->i8count--;
 963         }
 964         /*
 965          * See if the old number was small, the new number is large.
 966          */
 967         if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
 968             args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
 969                 /*
 970                  * add to the i8count unless we just converted to 8-byte
 971                  * inodes (which does an implied i8count = 1)
 972                  */
 973                 ASSERT(sfp->i8count != 0);
 974                 if (!i8elevated)
 975                         sfp->i8count++;
 976         }
 977         xfs_dir2_sf_check(args);
 978         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
 979         return 0;
 980 }
 981
 982 /*
 983  * Convert from 8-byte inode numbers to 4-byte inode numbers.
 984  * The last 8-byte inode number is gone, but the count is still 1.
 985  */
 986 static void
 987 xfs_dir2_sf_toino4(
 988         xfs_da_args_t           *args)          /* operation arguments */
 989 {
 990         char                    *buf;           /* old dir's buffer */
 991         xfs_inode_t             *dp;            /* incore directory inode */
 992         int                     i;              /* entry index */
 993         int                     newsize;        /* new inode size */
 994         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
 995         xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
 996         int                     oldsize;        /* old inode size */
 997         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
 998         xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
 999
1000         trace_xfs_dir2_sf_toino4(args);
1001
1002         dp = args->dp;
1003
1004         /*
1005          * Copy the old directory to the buffer.
1006          * Then nuke it from the inode, and add the new buffer to the inode.
1007          * Don't want xfs_idata_realloc copying the data here.
1008          */
1009         oldsize = dp->i_df.if_bytes;
1010         buf = kmem_alloc(oldsize, KM_SLEEP);
1011         oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1012         ASSERT(oldsfp->i8count == 1);
1013         memcpy(buf, oldsfp, oldsize);
1014         /*
1015          * Compute the new inode size.
1016          */
1017         newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
1018         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1019         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1020         /*
1021          * Reset our pointers, the data has moved.
1022          */
1023         oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1024         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1025         /*
1026          * Fill in the new header.
1027          */
1028         sfp->count = oldsfp->count;
1029         sfp->i8count = 0;
1030         dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1031         /*
1032          * Copy the entries field by field.
1033          */
1034         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1035                     oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1036              i < sfp->count;
1037              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1038                   oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1039                 sfep->namelen = oldsfep->namelen;
1040                 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1041                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1042                 dp->d_ops->sf_put_ino(sfp, sfep,
1043                                       dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1044                 dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1045         }
1046         /*
1047          * Clean up the inode.
1048          */
1049         kmem_free(buf);
1050         dp->i_d.di_size = newsize;
1051         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1052 }
1053
1054 /*
1055  * Convert existing entries from 4-byte inode numbers to 8-byte inode numbers.
1056  * The new entry w/ an 8-byte inode number is not there yet; we leave with
1057  * i8count set to 1, but no corresponding 8-byte entry.
1058  */
1059 static void
1060 xfs_dir2_sf_toino8(
1061         xfs_da_args_t           *args)          /* operation arguments */
1062 {
1063         char                    *buf;           /* old dir's buffer */
1064         xfs_inode_t             *dp;            /* incore directory inode */
1065         int                     i;              /* entry index */
1066         int                     newsize;        /* new inode size */
1067         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1068         xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
1069         int                     oldsize;        /* old inode size */
1070         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1071         xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
1072
1073         trace_xfs_dir2_sf_toino8(args);
1074
1075         dp = args->dp;
1076
1077         /*
1078          * Copy the old directory to the buffer.
1079          * Then nuke it from the inode, and add the new buffer to the inode.
1080          * Don't want xfs_idata_realloc copying the data here.
1081          */
1082         oldsize = dp->i_df.if_bytes;
1083         buf = kmem_alloc(oldsize, KM_SLEEP);
1084         oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1085         ASSERT(oldsfp->i8count == 0);
1086         memcpy(buf, oldsfp, oldsize);
1087         /*
1088          * Compute the new inode size (nb: entry count + 1 for parent)
1089          */
1090         newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
1091         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1092         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1093         /*
1094          * Reset our pointers, the data has moved.
1095          */
1096         oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1097         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1098         /*
1099          * Fill in the new header.
1100          */
1101         sfp->count = oldsfp->count;
1102         sfp->i8count = 1;
1103         dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1104         /*
1105          * Copy the entries field by field.
1106          */
1107         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1108                     oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1109              i < sfp->count;
1110              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1111                   oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1112                 sfep->namelen = oldsfep->namelen;
1113                 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1114                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1115                 dp->d_ops->sf_put_ino(sfp, sfep,
1116                                       dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1117                 dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1118         }
1119         /*
1120          * Clean up the inode.
1121          */
1122         kmem_free(buf);
1123         dp->i_d.di_size = newsize;
1124         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1125 }