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_dir.h"
  26 #include "xfs_dir2.h"
  27 #include "xfs_dmapi.h"
  28 #include "xfs_mount.h"
  29 #include "xfs_da_btree.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_dir_sf.h"
  32 #include "xfs_dir2_sf.h"
  33 #include "xfs_attr_sf.h"
  34 #include "xfs_dinode.h"
  35 #include "xfs_inode.h"
  36 #include "xfs_inode_item.h"
  37 #include "xfs_dir_leaf.h"
  38 #include "xfs_error.h"
  39 #include "xfs_dir2_data.h"
  40 #include "xfs_dir2_leaf.h"
  41 #include "xfs_dir2_block.h"
  42 #include "xfs_dir2_trace.h"
  43
  44 /*
  45  * Prototypes for internal functions.
  46  */
  47 static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
  48                                      xfs_dir2_sf_entry_t *sfep,
  49                                      xfs_dir2_data_aoff_t offset,
  50                                      int new_isize);
  51 static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
  52                                      int new_isize);
  53 static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
  54                                     xfs_dir2_sf_entry_t **sfepp,
  55                                     xfs_dir2_data_aoff_t *offsetp);
  56 #ifdef DEBUG
  57 static void xfs_dir2_sf_check(xfs_da_args_t *args);
  58 #else
  59 #define xfs_dir2_sf_check(args)
  60 #endif /* DEBUG */
  61 #if XFS_BIG_INUMS
  62 static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
  63 static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
  64 #endif /* XFS_BIG_INUMS */
  65
  66 /*
  67  * Given a block directory (dp/block), calculate its size as a shortform (sf)
  68  * directory and a header for the sf directory, if it will fit it the
  69  * space currently present in the inode.  If it won't fit, the output
  70  * size is too big (but not accurate).
  71  */
  72 int                                             /* size for sf form */
  73 xfs_dir2_block_sfsize(
  74         xfs_inode_t             *dp,            /* incore inode pointer */
  75         xfs_dir2_block_t        *block,         /* block directory data */
  76         xfs_dir2_sf_hdr_t       *sfhp)          /* output: header for sf form */
  77 {
  78         xfs_dir2_dataptr_t      addr;           /* data entry address */
  79         xfs_dir2_leaf_entry_t   *blp;           /* leaf area of the block */
  80         xfs_dir2_block_tail_t   *btp;           /* tail area of the block */
  81         int                     count;          /* shortform entry count */
  82         xfs_dir2_data_entry_t   *dep;           /* data entry in the block */
  83         int                     i;              /* block entry index */
  84         int                     i8count;        /* count of big-inode entries */
  85         int                     isdot;          /* entry is "." */
  86         int                     isdotdot;       /* entry is ".." */
  87         xfs_mount_t             *mp;            /* mount structure pointer */
  88         int                     namelen;        /* total name bytes */
  89         xfs_ino_t               parent = 0;     /* parent inode number */
  90         int                     size=0;         /* total computed size */
  91
  92         mp = dp->i_mount;
  93
  94         count = i8count = namelen = 0;
  95         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
  96         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
  97
  98         /*
  99          * Iterate over the block's data entries by using the leaf pointers.
 100          */
 101         for (i = 0; i < be32_to_cpu(btp->count); i++) {
 102                 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
 103                         continue;
 104                 /*
 105                  * Calculate the pointer to the entry at hand.
 106                  */
 107                 dep = (xfs_dir2_data_entry_t *)
 108                       ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr));
 109                 /*
 110                  * Detect . and .., so we can special-case them.
 111                  * . is not included in sf directories.
 112                  * .. is included by just the parent inode number.
 113                  */
 114                 isdot = dep->namelen == 1 && dep->name[0] == '.';
 115                 isdotdot =
 116                         dep->namelen == 2 &&
 117                         dep->name[0] == '.' && dep->name[1] == '.';
 118 #if XFS_BIG_INUMS
 119                 if (!isdot)
 120                         i8count += INT_GET(dep->inumber, ARCH_CONVERT) > XFS_DIR2_MAX_SHORT_INUM;
 121 #endif
 122                 if (!isdot && !isdotdot) {
 123                         count++;
 124                         namelen += dep->namelen;
 125                 } else if (isdotdot)
 126                         parent = INT_GET(dep->inumber, ARCH_CONVERT);
 127                 /*
 128                  * Calculate the new size, see if we should give up yet.
 129                  */
 130                 size = XFS_DIR2_SF_HDR_SIZE(i8count) +          /* header */
 131                        count +                                  /* namelen */
 132                        count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
 133                        namelen +                                /* name */
 134                        (i8count ?                               /* inumber */
 135                                 (uint)sizeof(xfs_dir2_ino8_t) * count :
 136                                 (uint)sizeof(xfs_dir2_ino4_t) * count);
 137                 if (size > XFS_IFORK_DSIZE(dp))
 138                         return size;            /* size value is a failure */
 139         }
 140         /*
 141          * Create the output header, if it worked.
 142          */
 143         sfhp->count = count;
 144         sfhp->i8count = i8count;
 145         XFS_DIR2_SF_PUT_INUMBER((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent);
 146         return size;
 147 }
 148
 149 /*
 150  * Convert a block format directory to shortform.
 151  * Caller has already checked that it will fit, and built us a header.
 152  */
 153 int                                             /* error */
 154 xfs_dir2_block_to_sf(
 155         xfs_da_args_t           *args,          /* operation arguments */
 156         xfs_dabuf_t             *bp,            /* block buffer */
 157         int                     size,           /* shortform directory size */
 158         xfs_dir2_sf_hdr_t       *sfhp)          /* shortform directory hdr */
 159 {
 160         xfs_dir2_block_t        *block;         /* block structure */
 161         xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
 162         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
 163         xfs_inode_t             *dp;            /* incore directory inode */
 164         xfs_dir2_data_unused_t  *dup;           /* unused data pointer */
 165         char                    *endptr;        /* end of data entries */
 166         int                     error;          /* error return value */
 167         int                     logflags;       /* inode logging flags */
 168         xfs_mount_t             *mp;            /* filesystem mount point */
 169         char                    *ptr;           /* current data pointer */
 170         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 171         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 172         xfs_ino_t               temp;
 173
 174         xfs_dir2_trace_args_sb("block_to_sf", args, size, bp);
 175         dp = args->dp;
 176         mp = dp->i_mount;
 177
 178         /*
 179          * Make a copy of the block data, so we can shrink the inode
 180          * and add local data.
 181          */
 182         block = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
 183         memcpy(block, bp->data, mp->m_dirblksize);
 184         logflags = XFS_ILOG_CORE;
 185         if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
 186                 ASSERT(error != ENOSPC);
 187                 goto out;
 188         }
 189         /*
 190          * The buffer is now unconditionally gone, whether
 191          * xfs_dir2_shrink_inode worked or not.
 192          *
 193          * Convert the inode to local format.
 194          */
 195         dp->i_df.if_flags &= ~XFS_IFEXTENTS;
 196         dp->i_df.if_flags |= XFS_IFINLINE;
 197         dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 198         ASSERT(dp->i_df.if_bytes == 0);
 199         xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 200         logflags |= XFS_ILOG_DDATA;
 201         /*
 202          * Copy the header into the newly allocate local space.
 203          */
 204         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 205         memcpy(sfp, sfhp, XFS_DIR2_SF_HDR_SIZE(sfhp->i8count));
 206         dp->i_d.di_size = size;
 207         /*
 208          * Set up to loop over the block's entries.
 209          */
 210         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 211         ptr = (char *)block->u;
 212         endptr = (char *)XFS_DIR2_BLOCK_LEAF_P(btp);
 213         sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 214         /*
 215          * Loop over the active and unused entries.
 216          * Stop when we reach the leaf/tail portion of the block.
 217          */
 218         while (ptr < endptr) {
 219                 /*
 220                  * If it's unused, just skip over it.
 221                  */
 222                 dup = (xfs_dir2_data_unused_t *)ptr;
 223                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 224                         ptr += be16_to_cpu(dup->length);
 225                         continue;
 226                 }
 227                 dep = (xfs_dir2_data_entry_t *)ptr;
 228                 /*
 229                  * Skip .
 230                  */
 231                 if (dep->namelen == 1 && dep->name[0] == '.')
 232                         ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) == dp->i_ino);
 233                 /*
 234                  * Skip .., but make sure the inode number is right.
 235                  */
 236                 else if (dep->namelen == 2 &&
 237                          dep->name[0] == '.' && dep->name[1] == '.')
 238                         ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) ==
 239                                XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent));
 240                 /*
 241                  * Normal entry, copy it into shortform.
 242                  */
 243                 else {
 244                         sfep->namelen = dep->namelen;
 245                         XFS_DIR2_SF_PUT_OFFSET(sfep,
 246                                 (xfs_dir2_data_aoff_t)
 247                                 ((char *)dep - (char *)block));
 248                         memcpy(sfep->name, dep->name, dep->namelen);
 249                         temp=INT_GET(dep->inumber, ARCH_CONVERT);
 250                         XFS_DIR2_SF_PUT_INUMBER(sfp, &temp,
 251                                 XFS_DIR2_SF_INUMBERP(sfep));
 252                         sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
 253                 }
 254                 ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen);
 255         }
 256         ASSERT((char *)sfep - (char *)sfp == size);
 257         xfs_dir2_sf_check(args);
 258 out:
 259         xfs_trans_log_inode(args->trans, dp, logflags);
 260         kmem_free(block, mp->m_dirblksize);
 261         return error;
 262 }
 263
 264 /*
 265  * Add a name to a shortform directory.
 266  * There are two algorithms, "easy" and "hard" which we decide on
 267  * before changing anything.
 268  * Convert to block form if necessary, if the new entry won't fit.
 269  */
 270 int                                             /* error */
 271 xfs_dir2_sf_addname(
 272         xfs_da_args_t           *args)          /* operation arguments */
 273 {
 274         int                     add_entsize;    /* size of the new entry */
 275         xfs_inode_t             *dp;            /* incore directory inode */
 276         int                     error;          /* error return value */
 277         int                     incr_isize;     /* total change in size */
 278         int                     new_isize;      /* di_size after adding name */
 279         int                     objchange;      /* changing to 8-byte inodes */
 280         xfs_dir2_data_aoff_t    offset = 0;     /* offset for new entry */
 281         int                     old_isize;      /* di_size before adding name */
 282         int                     pick;           /* which algorithm to use */
 283         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 284         xfs_dir2_sf_entry_t     *sfep = NULL;   /* shortform entry */
 285
 286         xfs_dir2_trace_args("sf_addname", args);
 287         ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
 288         dp = args->dp;
 289         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 290         /*
 291          * Make sure the shortform value has some of its header.
 292          */
 293         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 294                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 295                 return XFS_ERROR(EIO);
 296         }
 297         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 298         ASSERT(dp->i_df.if_u1.if_data != NULL);
 299         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 300         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
 301         /*
 302          * Compute entry (and change in) size.
 303          */
 304         add_entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen);
 305         incr_isize = add_entsize;
 306         objchange = 0;
 307 #if XFS_BIG_INUMS
 308         /*
 309          * Do we have to change to 8 byte inodes?
 310          */
 311         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
 312                 /*
 313                  * Yes, adjust the entry size and the total size.
 314                  */
 315                 add_entsize +=
 316                         (uint)sizeof(xfs_dir2_ino8_t) -
 317                         (uint)sizeof(xfs_dir2_ino4_t);
 318                 incr_isize +=
 319                         (sfp->hdr.count + 2) *
 320                         ((uint)sizeof(xfs_dir2_ino8_t) -
 321                          (uint)sizeof(xfs_dir2_ino4_t));
 322                 objchange = 1;
 323         }
 324 #endif
 325         old_isize = (int)dp->i_d.di_size;
 326         new_isize = old_isize + incr_isize;
 327         /*
 328          * Won't fit as shortform any more (due to size),
 329          * or the pick routine says it won't (due to offset values).
 330          */
 331         if (new_isize > XFS_IFORK_DSIZE(dp) ||
 332             (pick =
 333              xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
 334                 /*
 335                  * Just checking or no space reservation, it doesn't fit.
 336                  */
 337                 if (args->justcheck || args->total == 0)
 338                         return XFS_ERROR(ENOSPC);
 339                 /*
 340                  * Convert to block form then add the name.
 341                  */
 342                 error = xfs_dir2_sf_to_block(args);
 343                 if (error)
 344                         return error;
 345                 return xfs_dir2_block_addname(args);
 346         }
 347         /*
 348          * Just checking, it fits.
 349          */
 350         if (args->justcheck)
 351                 return 0;
 352         /*
 353          * Do it the easy way - just add it at the end.
 354          */
 355         if (pick == 1)
 356                 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
 357         /*
 358          * Do it the hard way - look for a place to insert the new entry.
 359          * Convert to 8 byte inode numbers first if necessary.
 360          */
 361         else {
 362                 ASSERT(pick == 2);
 363 #if XFS_BIG_INUMS
 364                 if (objchange)
 365                         xfs_dir2_sf_toino8(args);
 366 #endif
 367                 xfs_dir2_sf_addname_hard(args, objchange, new_isize);
 368         }
 369         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 370         return 0;
 371 }
 372
 373 /*
 374  * Add the new entry the "easy" way.
 375  * This is copying the old directory and adding the new entry at the end.
 376  * Since it's sorted by "offset" we need room after the last offset
 377  * that's already there, and then room to convert to a block directory.
 378  * This is already checked by the pick routine.
 379  */
 380 static void
 381 xfs_dir2_sf_addname_easy(
 382         xfs_da_args_t           *args,          /* operation arguments */
 383         xfs_dir2_sf_entry_t     *sfep,          /* pointer to new entry */
 384         xfs_dir2_data_aoff_t    offset,         /* offset to use for new ent */
 385         int                     new_isize)      /* new directory size */
 386 {
 387         int                     byteoff;        /* byte offset in sf dir */
 388         xfs_inode_t             *dp;            /* incore directory inode */
 389         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 390
 391         dp = args->dp;
 392
 393         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 394         byteoff = (int)((char *)sfep - (char *)sfp);
 395         /*
 396          * Grow the in-inode space.
 397          */
 398         xfs_idata_realloc(dp, XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen),
 399                 XFS_DATA_FORK);
 400         /*
 401          * Need to set up again due to realloc of the inode data.
 402          */
 403         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 404         sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
 405         /*
 406          * Fill in the new entry.
 407          */
 408         sfep->namelen = args->namelen;
 409         XFS_DIR2_SF_PUT_OFFSET(sfep, offset);
 410         memcpy(sfep->name, args->name, sfep->namelen);
 411         XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber,
 412                 XFS_DIR2_SF_INUMBERP(sfep));
 413         /*
 414          * Update the header and inode.
 415          */
 416         sfp->hdr.count++;
 417 #if XFS_BIG_INUMS
 418         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
 419                 sfp->hdr.i8count++;
 420 #endif
 421         dp->i_d.di_size = new_isize;
 422         xfs_dir2_sf_check(args);
 423 }
 424
 425 /*
 426  * Add the new entry the "hard" way.
 427  * The caller has already converted to 8 byte inode numbers if necessary,
 428  * in which case we need to leave the i8count at 1.
 429  * Find a hole that the new entry will fit into, and copy
 430  * the first part of the entries, the new entry, and the last part of
 431  * the entries.
 432  */
 433 /* ARGSUSED */
 434 static void
 435 xfs_dir2_sf_addname_hard(
 436         xfs_da_args_t           *args,          /* operation arguments */
 437         int                     objchange,      /* changing inode number size */
 438         int                     new_isize)      /* new directory size */
 439 {
 440         int                     add_datasize;   /* data size need for new ent */
 441         char                    *buf;           /* buffer for old */
 442         xfs_inode_t             *dp;            /* incore directory inode */
 443         int                     eof;            /* reached end of old dir */
 444         int                     nbytes;         /* temp for byte copies */
 445         xfs_dir2_data_aoff_t    new_offset;     /* next offset value */
 446         xfs_dir2_data_aoff_t    offset;         /* current offset value */
 447         int                     old_isize;      /* previous di_size */
 448         xfs_dir2_sf_entry_t     *oldsfep;       /* entry in original dir */
 449         xfs_dir2_sf_t           *oldsfp;        /* original shortform dir */
 450         xfs_dir2_sf_entry_t     *sfep;          /* entry in new dir */
 451         xfs_dir2_sf_t           *sfp;           /* new shortform dir */
 452
 453         /*
 454          * Copy the old directory to the stack buffer.
 455          */
 456         dp = args->dp;
 457
 458         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 459         old_isize = (int)dp->i_d.di_size;
 460         buf = kmem_alloc(old_isize, KM_SLEEP);
 461         oldsfp = (xfs_dir2_sf_t *)buf;
 462         memcpy(oldsfp, sfp, old_isize);
 463         /*
 464          * Loop over the old directory finding the place we're going
 465          * to insert the new entry.
 466          * If it's going to end up at the end then oldsfep will point there.
 467          */
 468         for (offset = XFS_DIR2_DATA_FIRST_OFFSET,
 469               oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp),
 470               add_datasize = XFS_DIR2_DATA_ENTSIZE(args->namelen),
 471               eof = (char *)oldsfep == &buf[old_isize];
 472              !eof;
 473              offset = new_offset + XFS_DIR2_DATA_ENTSIZE(oldsfep->namelen),
 474               oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep),
 475               eof = (char *)oldsfep == &buf[old_isize]) {
 476                 new_offset = XFS_DIR2_SF_GET_OFFSET(oldsfep);
 477                 if (offset + add_datasize <= new_offset)
 478                         break;
 479         }
 480         /*
 481          * Get rid of the old directory, then allocate space for
 482          * the new one.  We do this so xfs_idata_realloc won't copy
 483          * the data.
 484          */
 485         xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
 486         xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
 487         /*
 488          * Reset the pointer since the buffer was reallocated.
 489          */
 490         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 491         /*
 492          * Copy the first part of the directory, including the header.
 493          */
 494         nbytes = (int)((char *)oldsfep - (char *)oldsfp);
 495         memcpy(sfp, oldsfp, nbytes);
 496         sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
 497         /*
 498          * Fill in the new entry, and update the header counts.
 499          */
 500         sfep->namelen = args->namelen;
 501         XFS_DIR2_SF_PUT_OFFSET(sfep, offset);
 502         memcpy(sfep->name, args->name, sfep->namelen);
 503         XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber,
 504                 XFS_DIR2_SF_INUMBERP(sfep));
 505         sfp->hdr.count++;
 506 #if XFS_BIG_INUMS
 507         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
 508                 sfp->hdr.i8count++;
 509 #endif
 510         /*
 511          * If there's more left to copy, do that.
 512          */
 513         if (!eof) {
 514                 sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
 515                 memcpy(sfep, oldsfep, old_isize - nbytes);
 516         }
 517         kmem_free(buf, old_isize);
 518         dp->i_d.di_size = new_isize;
 519         xfs_dir2_sf_check(args);
 520 }
 521
 522 /*
 523  * Decide if the new entry will fit at all.
 524  * If it will fit, pick between adding the new entry to the end (easy)
 525  * or somewhere else (hard).
 526  * Return 0 (won't fit), 1 (easy), 2 (hard).
 527  */
 528 /*ARGSUSED*/
 529 static int                                      /* pick result */
 530 xfs_dir2_sf_addname_pick(
 531         xfs_da_args_t           *args,          /* operation arguments */
 532         int                     objchange,      /* inode # size changes */
 533         xfs_dir2_sf_entry_t     **sfepp,        /* out(1): new entry ptr */
 534         xfs_dir2_data_aoff_t    *offsetp)       /* out(1): new offset */
 535 {
 536         xfs_inode_t             *dp;            /* incore directory inode */
 537         int                     holefit;        /* found hole it will fit in */
 538         int                     i;              /* entry number */
 539         xfs_mount_t             *mp;            /* filesystem mount point */
 540         xfs_dir2_data_aoff_t    offset;         /* data block offset */
 541         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 542         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 543         int                     size;           /* entry's data size */
 544         int                     used;           /* data bytes used */
 545
 546         dp = args->dp;
 547         mp = dp->i_mount;
 548
 549         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 550         size = XFS_DIR2_DATA_ENTSIZE(args->namelen);
 551         offset = XFS_DIR2_DATA_FIRST_OFFSET;
 552         sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 553         holefit = 0;
 554         /*
 555          * Loop over sf entries.
 556          * Keep track of data offset and whether we've seen a place
 557          * to insert the new entry.
 558          */
 559         for (i = 0; i < sfp->hdr.count; i++) {
 560                 if (!holefit)
 561                         holefit = offset + size <= XFS_DIR2_SF_GET_OFFSET(sfep);
 562                 offset = XFS_DIR2_SF_GET_OFFSET(sfep) +
 563                          XFS_DIR2_DATA_ENTSIZE(sfep->namelen);
 564                 sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
 565         }
 566         /*
 567          * Calculate data bytes used excluding the new entry, if this
 568          * was a data block (block form directory).
 569          */
 570         used = offset +
 571                (sfp->hdr.count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 572                (uint)sizeof(xfs_dir2_block_tail_t);
 573         /*
 574          * If it won't fit in a block form then we can't insert it,
 575          * we'll go back, convert to block, then try the insert and convert
 576          * to leaf.
 577          */
 578         if (used + (holefit ? 0 : size) > mp->m_dirblksize)
 579                 return 0;
 580         /*
 581          * If changing the inode number size, do it the hard way.
 582          */
 583 #if XFS_BIG_INUMS
 584         if (objchange) {
 585                 return 2;
 586         }
 587 #else
 588         ASSERT(objchange == 0);
 589 #endif
 590         /*
 591          * If it won't fit at the end then do it the hard way (use the hole).
 592          */
 593         if (used + size > mp->m_dirblksize)
 594                 return 2;
 595         /*
 596          * Do it the easy way.
 597          */
 598         *sfepp = sfep;
 599         *offsetp = offset;
 600         return 1;
 601 }
 602
 603 #ifdef DEBUG
 604 /*
 605  * Check consistency of shortform directory, assert if bad.
 606  */
 607 static void
 608 xfs_dir2_sf_check(
 609         xfs_da_args_t           *args)          /* operation arguments */
 610 {
 611         xfs_inode_t             *dp;            /* incore directory inode */
 612         int                     i;              /* entry number */
 613         int                     i8count;        /* number of big inode#s */
 614         xfs_ino_t               ino;            /* entry inode number */
 615         int                     offset;         /* data offset */
 616         xfs_dir2_sf_entry_t     *sfep;          /* shortform dir entry */
 617         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 618
 619         dp = args->dp;
 620
 621         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 622         offset = XFS_DIR2_DATA_FIRST_OFFSET;
 623         ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
 624         i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 625
 626         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 627              i < sfp->hdr.count;
 628              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
 629                 ASSERT(XFS_DIR2_SF_GET_OFFSET(sfep) >= offset);
 630                 ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep));
 631                 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 632                 offset =
 633                         XFS_DIR2_SF_GET_OFFSET(sfep) +
 634                         XFS_DIR2_DATA_ENTSIZE(sfep->namelen);
 635         }
 636         ASSERT(i8count == sfp->hdr.i8count);
 637         ASSERT(XFS_BIG_INUMS || i8count == 0);
 638         ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
 639         ASSERT(offset +
 640                (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 641                (uint)sizeof(xfs_dir2_block_tail_t) <=
 642                dp->i_mount->m_dirblksize);
 643 }
 644 #endif  /* DEBUG */
 645
 646 /*
 647  * Create a new (shortform) directory.
 648  */
 649 int                                     /* error, always 0 */
 650 xfs_dir2_sf_create(
 651         xfs_da_args_t   *args,          /* operation arguments */
 652         xfs_ino_t       pino)           /* parent inode number */
 653 {
 654         xfs_inode_t     *dp;            /* incore directory inode */
 655         int             i8count;        /* parent inode is an 8-byte number */
 656         xfs_dir2_sf_t   *sfp;           /* shortform structure */
 657         int             size;           /* directory size */
 658
 659         xfs_dir2_trace_args_i("sf_create", args, pino);
 660         dp = args->dp;
 661
 662         ASSERT(dp != NULL);
 663         ASSERT(dp->i_d.di_size == 0);
 664         /*
 665          * If it's currently a zero-length extent file,
 666          * convert it to local format.
 667          */
 668         if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
 669                 dp->i_df.if_flags &= ~XFS_IFEXTENTS;    /* just in case */
 670                 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 671                 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
 672                 dp->i_df.if_flags |= XFS_IFINLINE;
 673         }
 674         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 675         ASSERT(dp->i_df.if_bytes == 0);
 676         i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
 677         size = XFS_DIR2_SF_HDR_SIZE(i8count);
 678         /*
 679          * Make a buffer for the data.
 680          */
 681         xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 682         /*
 683          * Fill in the header,
 684          */
 685         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 686         sfp->hdr.i8count = i8count;
 687         /*
 688          * Now can put in the inode number, since i8count is set.
 689          */
 690         XFS_DIR2_SF_PUT_INUMBER(sfp, &pino, &sfp->hdr.parent);
 691         sfp->hdr.count = 0;
 692         dp->i_d.di_size = size;
 693         xfs_dir2_sf_check(args);
 694         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 695         return 0;
 696 }
 697
 698 int                                             /* error */
 699 xfs_dir2_sf_getdents(
 700         xfs_inode_t             *dp,            /* incore directory inode */
 701         uio_t                   *uio,           /* caller's buffer control */
 702         int                     *eofp,          /* eof reached? (out) */
 703         xfs_dirent_t            *dbp,           /* caller's buffer */
 704         xfs_dir2_put_t          put)            /* abi's formatting function */
 705 {
 706         int                     error;          /* error return value */
 707         int                     i;              /* shortform entry number */
 708         xfs_mount_t             *mp;            /* filesystem mount point */
 709         xfs_dir2_dataptr_t      off;            /* current entry's offset */
 710         xfs_dir2_put_args_t     p;              /* arg package for put rtn */
 711         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 712         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 713         xfs_off_t                       dir_offset;
 714
 715         mp = dp->i_mount;
 716
 717         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 718         /*
 719          * Give up if the directory is way too short.
 720          */
 721         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 722                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 723                 return XFS_ERROR(EIO);
 724         }
 725
 726         dir_offset = uio->uio_offset;
 727
 728         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 729         ASSERT(dp->i_df.if_u1.if_data != NULL);
 730
 731         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 732
 733         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
 734
 735         /*
 736          * If the block number in the offset is out of range, we're done.
 737          */
 738         if (XFS_DIR2_DATAPTR_TO_DB(mp, dir_offset) > mp->m_dirdatablk) {
 739                 *eofp = 1;
 740                 return 0;
 741         }
 742
 743         /*
 744          * Set up putargs structure.
 745          */
 746         p.dbp = dbp;
 747         p.put = put;
 748         p.uio = uio;
 749         /*
 750          * Put . entry unless we're starting past it.
 751          */
 752         if (dir_offset <=
 753                     XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 754                                                XFS_DIR2_DATA_DOT_OFFSET)) {
 755                 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, 0,
 756                                                 XFS_DIR2_DATA_DOTDOT_OFFSET);
 757                 p.ino = dp->i_ino;
 758 #if XFS_BIG_INUMS
 759                 p.ino += mp->m_inoadd;
 760 #endif
 761                 p.name = ".";
 762                 p.namelen = 1;
 763
 764                 error = p.put(&p);
 765
 766                 if (!p.done) {
 767                         uio->uio_offset =
 768                                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 769                                                 XFS_DIR2_DATA_DOT_OFFSET);
 770                         return error;
 771                 }
 772         }
 773
 774         /*
 775          * Put .. entry unless we're starting past it.
 776          */
 777         if (dir_offset <=
 778                     XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 779                                                XFS_DIR2_DATA_DOTDOT_OFFSET)) {
 780                 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 781                                                 XFS_DIR2_DATA_FIRST_OFFSET);
 782                 p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
 783 #if XFS_BIG_INUMS
 784                 p.ino += mp->m_inoadd;
 785 #endif
 786                 p.name = "..";
 787                 p.namelen = 2;
 788
 789                 error = p.put(&p);
 790
 791                 if (!p.done) {
 792                         uio->uio_offset =
 793                                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 794                                         XFS_DIR2_DATA_DOTDOT_OFFSET);
 795                         return error;
 796                 }
 797         }
 798
 799         /*
 800          * Loop while there are more entries and put'ing works.
 801          */
 802         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 803                      i < sfp->hdr.count;
 804                              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
 805
 806                 off = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 807                                 XFS_DIR2_SF_GET_OFFSET(sfep));
 808
 809                 if (dir_offset > off)
 810                         continue;
 811
 812                 p.namelen = sfep->namelen;
 813
 814                 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 815                         XFS_DIR2_SF_GET_OFFSET(sfep) +
 816                         XFS_DIR2_DATA_ENTSIZE(p.namelen));
 817
 818                 p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep));
 819 #if XFS_BIG_INUMS
 820                 p.ino += mp->m_inoadd;
 821 #endif
 822                 p.name = (char *)sfep->name;
 823
 824                 error = p.put(&p);
 825
 826                 if (!p.done) {
 827                         uio->uio_offset = off;
 828                         return error;
 829                 }
 830         }
 831
 832         /*
 833          * They all fit.
 834          */
 835         *eofp = 1;
 836
 837         uio->uio_offset =
 838                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk + 1, 0);
 839
 840         return 0;
 841 }
 842
 843 /*
 844  * Lookup an entry in a shortform directory.
 845  * Returns EEXIST if found, ENOENT if not found.
 846  */
 847 int                                             /* error */
 848 xfs_dir2_sf_lookup(
 849         xfs_da_args_t           *args)          /* operation arguments */
 850 {
 851         xfs_inode_t             *dp;            /* incore directory inode */
 852         int                     i;              /* entry index */
 853         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 854         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 855
 856         xfs_dir2_trace_args("sf_lookup", args);
 857         xfs_dir2_sf_check(args);
 858         dp = args->dp;
 859
 860         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 861         /*
 862          * Bail out if the directory is way too short.
 863          */
 864         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 865                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 866                 return XFS_ERROR(EIO);
 867         }
 868         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 869         ASSERT(dp->i_df.if_u1.if_data != NULL);
 870         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 871         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
 872         /*
 873          * Special case for .
 874          */
 875         if (args->namelen == 1 && args->name[0] == '.') {
 876                 args->inumber = dp->i_ino;
 877                 return XFS_ERROR(EEXIST);
 878         }
 879         /*
 880          * Special case for ..
 881          */
 882         if (args->namelen == 2 &&
 883             args->name[0] == '.' && args->name[1] == '.') {
 884                 args->inumber = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
 885                 return XFS_ERROR(EEXIST);
 886         }
 887         /*
 888          * Loop over all the entries trying to match ours.
 889          */
 890         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 891              i < sfp->hdr.count;
 892              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
 893                 if (sfep->namelen == args->namelen &&
 894                     sfep->name[0] == args->name[0] &&
 895                     memcmp(args->name, sfep->name, args->namelen) == 0) {
 896                         args->inumber =
 897                                 XFS_DIR2_SF_GET_INUMBER(sfp,
 898                                         XFS_DIR2_SF_INUMBERP(sfep));
 899                         return XFS_ERROR(EEXIST);
 900                 }
 901         }
 902         /*
 903          * Didn't find it.
 904          */
 905         ASSERT(args->oknoent);
 906         return XFS_ERROR(ENOENT);
 907 }
 908
 909 /*
 910  * Remove an entry from a shortform directory.
 911  */
 912 int                                             /* error */
 913 xfs_dir2_sf_removename(
 914         xfs_da_args_t           *args)
 915 {
 916         int                     byteoff;        /* offset of removed entry */
 917         xfs_inode_t             *dp;            /* incore directory inode */
 918         int                     entsize;        /* this entry's size */
 919         int                     i;              /* shortform entry index */
 920         int                     newsize;        /* new inode size */
 921         int                     oldsize;        /* old inode size */
 922         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 923         xfs_dir2_sf_t           *sfp;           /* shortform structure */
 924
 925         xfs_dir2_trace_args("sf_removename", args);
 926         dp = args->dp;
 927
 928         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 929         oldsize = (int)dp->i_d.di_size;
 930         /*
 931          * Bail out if the directory is way too short.
 932          */
 933         if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 934                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 935                 return XFS_ERROR(EIO);
 936         }
 937         ASSERT(dp->i_df.if_bytes == oldsize);
 938         ASSERT(dp->i_df.if_u1.if_data != NULL);
 939         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 940         ASSERT(oldsize >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
 941         /*
 942          * Loop over the old directory entries.
 943          * Find the one we're deleting.
 944          */
 945         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
 946              i < sfp->hdr.count;
 947              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
 948                 if (sfep->namelen == args->namelen &&
 949                     sfep->name[0] == args->name[0] &&
 950                     memcmp(sfep->name, args->name, args->namelen) == 0) {
 951                         ASSERT(XFS_DIR2_SF_GET_INUMBER(sfp,
 952                                         XFS_DIR2_SF_INUMBERP(sfep)) ==
 953                                 args->inumber);
 954                         break;
 955                 }
 956         }
 957         /*
 958          * Didn't find it.
 959          */
 960         if (i == sfp->hdr.count) {
 961                 return XFS_ERROR(ENOENT);
 962         }
 963         /*
 964          * Calculate sizes.
 965          */
 966         byteoff = (int)((char *)sfep - (char *)sfp);
 967         entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen);
 968         newsize = oldsize - entsize;
 969         /*
 970          * Copy the part if any after the removed entry, sliding it down.
 971          */
 972         if (byteoff + entsize < oldsize)
 973                 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
 974                         oldsize - (byteoff + entsize));
 975         /*
 976          * Fix up the header and file size.
 977          */
 978         sfp->hdr.count--;
 979         dp->i_d.di_size = newsize;
 980         /*
 981          * Reallocate, making it smaller.
 982          */
 983         xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
 984         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 985 #if XFS_BIG_INUMS
 986         /*
 987          * Are we changing inode number size?
 988          */
 989         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
 990                 if (sfp->hdr.i8count == 1)
 991                         xfs_dir2_sf_toino4(args);
 992                 else
 993                         sfp->hdr.i8count--;
 994         }
 995 #endif
 996         xfs_dir2_sf_check(args);
 997         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 998         return 0;
 999 }
1000
1001 /*
1002  * Replace the inode number of an entry in a shortform directory.
1003  */
1004 int                                             /* error */
1005 xfs_dir2_sf_replace(
1006         xfs_da_args_t           *args)          /* operation arguments */
1007 {
1008         xfs_inode_t             *dp;            /* incore directory inode */
1009         int                     i;              /* entry index */
1010 #if XFS_BIG_INUMS || defined(DEBUG)
1011         xfs_ino_t               ino=0;          /* entry old inode number */
1012 #endif
1013 #if XFS_BIG_INUMS
1014         int                     i8elevated;     /* sf_toino8 set i8count=1 */
1015 #endif
1016         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
1017         xfs_dir2_sf_t           *sfp;           /* shortform structure */
1018
1019         xfs_dir2_trace_args("sf_replace", args);
1020         dp = args->dp;
1021
1022         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1023         /*
1024          * Bail out if the shortform directory is way too small.
1025          */
1026         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1027                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
1028                 return XFS_ERROR(EIO);
1029         }
1030         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1031         ASSERT(dp->i_df.if_u1.if_data != NULL);
1032         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1033         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
1034 #if XFS_BIG_INUMS
1035         /*
1036          * New inode number is large, and need to convert to 8-byte inodes.
1037          */
1038         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
1039                 int     error;                  /* error return value */
1040                 int     newsize;                /* new inode size */
1041
1042                 newsize =
1043                         dp->i_df.if_bytes +
1044                         (sfp->hdr.count + 1) *
1045                         ((uint)sizeof(xfs_dir2_ino8_t) -
1046                          (uint)sizeof(xfs_dir2_ino4_t));
1047                 /*
1048                  * Won't fit as shortform, convert to block then do replace.
1049                  */
1050                 if (newsize > XFS_IFORK_DSIZE(dp)) {
1051                         error = xfs_dir2_sf_to_block(args);
1052                         if (error) {
1053                                 return error;
1054                         }
1055                         return xfs_dir2_block_replace(args);
1056                 }
1057                 /*
1058                  * Still fits, convert to 8-byte now.
1059                  */
1060                 xfs_dir2_sf_toino8(args);
1061                 i8elevated = 1;
1062                 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1063         } else
1064                 i8elevated = 0;
1065 #endif
1066         ASSERT(args->namelen != 1 || args->name[0] != '.');
1067         /*
1068          * Replace ..'s entry.
1069          */
1070         if (args->namelen == 2 &&
1071             args->name[0] == '.' && args->name[1] == '.') {
1072 #if XFS_BIG_INUMS || defined(DEBUG)
1073                 ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
1074                 ASSERT(args->inumber != ino);
1075 #endif
1076                 XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, &sfp->hdr.parent);
1077         }
1078         /*
1079          * Normal entry, look for the name.
1080          */
1081         else {
1082                 for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
1083                      i < sfp->hdr.count;
1084                      i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
1085                         if (sfep->namelen == args->namelen &&
1086                             sfep->name[0] == args->name[0] &&
1087                             memcmp(args->name, sfep->name, args->namelen) == 0) {
1088 #if XFS_BIG_INUMS || defined(DEBUG)
1089                                 ino = XFS_DIR2_SF_GET_INUMBER(sfp,
1090                                         XFS_DIR2_SF_INUMBERP(sfep));
1091                                 ASSERT(args->inumber != ino);
1092 #endif
1093                                 XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber,
1094                                         XFS_DIR2_SF_INUMBERP(sfep));
1095                                 break;
1096                         }
1097                 }
1098                 /*
1099                  * Didn't find it.
1100                  */
1101                 if (i == sfp->hdr.count) {
1102                         ASSERT(args->oknoent);
1103 #if XFS_BIG_INUMS
1104                         if (i8elevated)
1105                                 xfs_dir2_sf_toino4(args);
1106 #endif
1107                         return XFS_ERROR(ENOENT);
1108                 }
1109         }
1110 #if XFS_BIG_INUMS
1111         /*
1112          * See if the old number was large, the new number is small.
1113          */
1114         if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1115             args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1116                 /*
1117                  * And the old count was one, so need to convert to small.
1118                  */
1119                 if (sfp->hdr.i8count == 1)
1120                         xfs_dir2_sf_toino4(args);
1121                 else
1122                         sfp->hdr.i8count--;
1123         }
1124         /*
1125          * See if the old number was small, the new number is large.
1126          */
1127         if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1128             args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1129                 /*
1130                  * add to the i8count unless we just converted to 8-byte
1131                  * inodes (which does an implied i8count = 1)
1132                  */
1133                 ASSERT(sfp->hdr.i8count != 0);
1134                 if (!i8elevated)
1135                         sfp->hdr.i8count++;
1136         }
1137 #endif
1138         xfs_dir2_sf_check(args);
1139         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1140         return 0;
1141 }
1142
1143 #if XFS_BIG_INUMS
1144 /*
1145  * Convert from 8-byte inode numbers to 4-byte inode numbers.
1146  * The last 8-byte inode number is gone, but the count is still 1.
1147  */
1148 static void
1149 xfs_dir2_sf_toino4(
1150         xfs_da_args_t           *args)          /* operation arguments */
1151 {
1152         char                    *buf;           /* old dir's buffer */
1153         xfs_inode_t             *dp;            /* incore directory inode */
1154         int                     i;              /* entry index */
1155         xfs_ino_t               ino;            /* entry inode number */
1156         int                     newsize;        /* new inode size */
1157         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1158         xfs_dir2_sf_t           *oldsfp;        /* old sf directory */
1159         int                     oldsize;        /* old inode size */
1160         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1161         xfs_dir2_sf_t           *sfp;           /* new sf directory */
1162
1163         xfs_dir2_trace_args("sf_toino4", args);
1164         dp = args->dp;
1165
1166         /*
1167          * Copy the old directory to the buffer.
1168          * Then nuke it from the inode, and add the new buffer to the inode.
1169          * Don't want xfs_idata_realloc copying the data here.
1170          */
1171         oldsize = dp->i_df.if_bytes;
1172         buf = kmem_alloc(oldsize, KM_SLEEP);
1173         oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1174         ASSERT(oldsfp->hdr.i8count == 1);
1175         memcpy(buf, oldsfp, oldsize);
1176         /*
1177          * Compute the new inode size.
1178          */
1179         newsize =
1180                 oldsize -
1181                 (oldsfp->hdr.count + 1) *
1182                 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1183         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1184         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1185         /*
1186          * Reset our pointers, the data has moved.
1187          */
1188         oldsfp = (xfs_dir2_sf_t *)buf;
1189         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1190         /*
1191          * Fill in the new header.
1192          */
1193         sfp->hdr.count = oldsfp->hdr.count;
1194         sfp->hdr.i8count = 0;
1195         ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent);
1196         XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent);
1197         /*
1198          * Copy the entries field by field.
1199          */
1200         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp),
1201                     oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp);
1202              i < sfp->hdr.count;
1203              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep),
1204                   oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) {
1205                 sfep->namelen = oldsfep->namelen;
1206                 sfep->offset = oldsfep->offset;
1207                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1208                 ino = XFS_DIR2_SF_GET_INUMBER(oldsfp,
1209                         XFS_DIR2_SF_INUMBERP(oldsfep));
1210                 XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep));
1211         }
1212         /*
1213          * Clean up the inode.
1214          */
1215         kmem_free(buf, oldsize);
1216         dp->i_d.di_size = newsize;
1217         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1218 }
1219
1220 /*
1221  * Convert from 4-byte inode numbers to 8-byte inode numbers.
1222  * The new 8-byte inode number is not there yet, we leave with the
1223  * count 1 but no corresponding entry.
1224  */
1225 static void
1226 xfs_dir2_sf_toino8(
1227         xfs_da_args_t           *args)          /* operation arguments */
1228 {
1229         char                    *buf;           /* old dir's buffer */
1230         xfs_inode_t             *dp;            /* incore directory inode */
1231         int                     i;              /* entry index */
1232         xfs_ino_t               ino;            /* entry inode number */
1233         int                     newsize;        /* new inode size */
1234         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1235         xfs_dir2_sf_t           *oldsfp;        /* old sf directory */
1236         int                     oldsize;        /* old inode size */
1237         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1238         xfs_dir2_sf_t           *sfp;           /* new sf directory */
1239
1240         xfs_dir2_trace_args("sf_toino8", args);
1241         dp = args->dp;
1242
1243         /*
1244          * Copy the old directory to the buffer.
1245          * Then nuke it from the inode, and add the new buffer to the inode.
1246          * Don't want xfs_idata_realloc copying the data here.
1247          */
1248         oldsize = dp->i_df.if_bytes;
1249         buf = kmem_alloc(oldsize, KM_SLEEP);
1250         oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1251         ASSERT(oldsfp->hdr.i8count == 0);
1252         memcpy(buf, oldsfp, oldsize);
1253         /*
1254          * Compute the new inode size.
1255          */
1256         newsize =
1257                 oldsize +
1258                 (oldsfp->hdr.count + 1) *
1259                 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1260         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1261         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1262         /*
1263          * Reset our pointers, the data has moved.
1264          */
1265         oldsfp = (xfs_dir2_sf_t *)buf;
1266         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1267         /*
1268          * Fill in the new header.
1269          */
1270         sfp->hdr.count = oldsfp->hdr.count;
1271         sfp->hdr.i8count = 1;
1272         ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent);
1273         XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent);
1274         /*
1275          * Copy the entries field by field.
1276          */
1277         for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp),
1278                     oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp);
1279              i < sfp->hdr.count;
1280              i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep),
1281                   oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) {
1282                 sfep->namelen = oldsfep->namelen;
1283                 sfep->offset = oldsfep->offset;
1284                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1285                 ino = XFS_DIR2_SF_GET_INUMBER(oldsfp,
1286                         XFS_DIR2_SF_INUMBERP(oldsfep));
1287                 XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep));
1288         }
1289         /*
1290          * Clean up the inode.
1291          */
1292         kmem_free(buf, oldsize);
1293         dp->i_d.di_size = newsize;
1294         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1295 }
1296 #endif  /* XFS_BIG_INUMS */