Showing error 1669

User: Jiri Slaby
Error type: Invalid Pointer Dereference
Error type description: A pointer which is invalid is being dereferenced
File location: fs/xfs/xfs_dir2_sf.c
Line in file: 209
Project: Linux Kernel
Project version: 2.6.28
Tools: Smatch (1.59)
Entered: 2013-09-10 07:54:05 UTC

Source: 

   1/*
   2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#include "xfs.h"
  19#include "xfs_fs.h"
  20#include "xfs_types.h"
  21#include "xfs_log.h"
  22#include "xfs_inum.h"
  23#include "xfs_trans.h"
  24#include "xfs_sb.h"
  25#include "xfs_ag.h"
  26#include "xfs_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_dir2_sf.h"
  32#include "xfs_attr_sf.h"
  33#include "xfs_dinode.h"
  34#include "xfs_inode.h"
  35#include "xfs_inode_item.h"
  36#include "xfs_error.h"
  37#include "xfs_dir2_data.h"
  38#include "xfs_dir2_leaf.h"
  39#include "xfs_dir2_block.h"
  40#include "xfs_dir2_trace.h"
  41
  42/*
  43 * Prototypes for internal functions.
  44 */
  45static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
  46                                     xfs_dir2_sf_entry_t *sfep,
  47                                     xfs_dir2_data_aoff_t offset,
  48                                     int new_isize);
  49static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
  50                                     int new_isize);
  51static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
  52                                    xfs_dir2_sf_entry_t **sfepp,
  53                                    xfs_dir2_data_aoff_t *offsetp);
  54#ifdef DEBUG
  55static void xfs_dir2_sf_check(xfs_da_args_t *args);
  56#else
  57#define        xfs_dir2_sf_check(args)
  58#endif /* DEBUG */
  59#if XFS_BIG_INUMS
  60static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
  61static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
  62#endif /* XFS_BIG_INUMS */
  63
  64/*
  65 * Given a block directory (dp/block), calculate its size as a shortform (sf)
  66 * directory and a header for the sf directory, if it will fit it the
  67 * space currently present in the inode.  If it won't fit, the output
  68 * size is too big (but not accurate).
  69 */
  70int                                                /* size for sf form */
  71xfs_dir2_block_sfsize(
  72        xfs_inode_t                *dp,                /* incore inode pointer */
  73        xfs_dir2_block_t        *block,                /* block directory data */
  74        xfs_dir2_sf_hdr_t        *sfhp)                /* output: header for sf form */
  75{
  76        xfs_dir2_dataptr_t        addr;                /* data entry address */
  77        xfs_dir2_leaf_entry_t        *blp;                /* leaf area of the block */
  78        xfs_dir2_block_tail_t        *btp;                /* tail area of the block */
  79        int                        count;                /* shortform entry count */
  80        xfs_dir2_data_entry_t        *dep;                /* data entry in the block */
  81        int                        i;                /* block entry index */
  82        int                        i8count;        /* count of big-inode entries */
  83        int                        isdot;                /* entry is "." */
  84        int                        isdotdot;        /* entry is ".." */
  85        xfs_mount_t                *mp;                /* mount structure pointer */
  86        int                        namelen;        /* total name bytes */
  87        xfs_ino_t                parent = 0;        /* parent inode number */
  88        int                        size=0;                /* total computed size */
  89
  90        mp = dp->i_mount;
  91
  92        count = i8count = namelen = 0;
  93        btp = xfs_dir2_block_tail_p(mp, block);
  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 *)
 106                      ((char *)block + xfs_dir2_dataptr_to_off(mp, 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#if XFS_BIG_INUMS
 117                if (!isdot)
 118                        i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
 119#endif
 120                if (!isdot && !isdotdot) {
 121                        count++;
 122                        namelen += dep->namelen;
 123                } else if (isdotdot)
 124                        parent = be64_to_cpu(dep->inumber);
 125                /*
 126                 * Calculate the new size, see if we should give up yet.
 127                 */
 128                size = xfs_dir2_sf_hdr_size(i8count) +                /* header */
 129                       count +                                        /* namelen */
 130                       count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
 131                       namelen +                                /* name */
 132                       (i8count ?                                /* inumber */
 133                                (uint)sizeof(xfs_dir2_ino8_t) * count :
 134                                (uint)sizeof(xfs_dir2_ino4_t) * count);
 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        xfs_dir2_sf_put_inumber((xfs_dir2_sf_t *)sfhp, &parent, &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 */
 151int                                                /* error */
 152xfs_dir2_block_to_sf(
 153        xfs_da_args_t                *args,                /* operation arguments */
 154        xfs_dabuf_t                *bp,                /* block buffer */
 155        int                        size,                /* shortform directory size */
 156        xfs_dir2_sf_hdr_t        *sfhp)                /* shortform directory hdr */
 157{
 158        xfs_dir2_block_t        *block;                /* block structure */
 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_t                *sfp;                /* shortform structure */
 170        xfs_ino_t               temp;
 171
 172        xfs_dir2_trace_args_sb("block_to_sf", args, size, bp);
 173        dp = args->dp;
 174        mp = dp->i_mount;
 175
 176        /*
 177         * Make a copy of the block data, so we can shrink the inode
 178         * and add local data.
 179         */
 180        block = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
 181        memcpy(block, bp->data, mp->m_dirblksize);
 182        logflags = XFS_ILOG_CORE;
 183        if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
 184                ASSERT(error != ENOSPC);
 185                goto out;
 186        }
 187        /*
 188         * The buffer is now unconditionally gone, whether
 189         * xfs_dir2_shrink_inode worked or not.
 190         *
 191         * Convert the inode to local format.
 192         */
 193        dp->i_df.if_flags &= ~XFS_IFEXTENTS;
 194        dp->i_df.if_flags |= XFS_IFINLINE;
 195        dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 196        ASSERT(dp->i_df.if_bytes == 0);
 197        xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 198        logflags |= XFS_ILOG_DDATA;
 199        /*
 200         * Copy the header into the newly allocate local space.
 201         */
 202        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 203        memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
 204        dp->i_d.di_size = size;
 205        /*
 206         * Set up to loop over the block's entries.
 207         */
 208        btp = xfs_dir2_block_tail_p(mp, block);
 209        ptr = (char *)block->u;
 210        endptr = (char *)xfs_dir2_block_leaf_p(btp);
 211        sfep = xfs_dir2_sf_firstentry(sfp);
 212        /*
 213         * Loop over the active and unused entries.
 214         * Stop when we reach the leaf/tail portion of the block.
 215         */
 216        while (ptr < endptr) {
 217                /*
 218                 * If it's unused, just skip over it.
 219                 */
 220                dup = (xfs_dir2_data_unused_t *)ptr;
 221                if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 222                        ptr += be16_to_cpu(dup->length);
 223                        continue;
 224                }
 225                dep = (xfs_dir2_data_entry_t *)ptr;
 226                /*
 227                 * Skip .
 228                 */
 229                if (dep->namelen == 1 && dep->name[0] == '.')
 230                        ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
 231                /*
 232                 * Skip .., but make sure the inode number is right.
 233                 */
 234                else if (dep->namelen == 2 &&
 235                         dep->name[0] == '.' && dep->name[1] == '.')
 236                        ASSERT(be64_to_cpu(dep->inumber) ==
 237                               xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));
 238                /*
 239                 * Normal entry, copy it into shortform.
 240                 */
 241                else {
 242                        sfep->namelen = dep->namelen;
 243                        xfs_dir2_sf_put_offset(sfep,
 244                                (xfs_dir2_data_aoff_t)
 245                                ((char *)dep - (char *)block));
 246                        memcpy(sfep->name, dep->name, dep->namelen);
 247                        temp = be64_to_cpu(dep->inumber);
 248                        xfs_dir2_sf_put_inumber(sfp, &temp,
 249                                xfs_dir2_sf_inumberp(sfep));
 250                        sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 251                }
 252                ptr += xfs_dir2_data_entsize(dep->namelen);
 253        }
 254        ASSERT((char *)sfep - (char *)sfp == size);
 255        xfs_dir2_sf_check(args);
 256out:
 257        xfs_trans_log_inode(args->trans, dp, logflags);
 258        kmem_free(block);
 259        return error;
 260}
 261
 262/*
 263 * Add a name to a shortform directory.
 264 * There are two algorithms, "easy" and "hard" which we decide on
 265 * before changing anything.
 266 * Convert to block form if necessary, if the new entry won't fit.
 267 */
 268int                                                /* error */
 269xfs_dir2_sf_addname(
 270        xfs_da_args_t                *args)                /* operation arguments */
 271{
 272        int                        add_entsize;        /* size of the new entry */
 273        xfs_inode_t                *dp;                /* incore directory inode */
 274        int                        error;                /* error return value */
 275        int                        incr_isize;        /* total change in size */
 276        int                        new_isize;        /* di_size after adding name */
 277        int                        objchange;        /* changing to 8-byte inodes */
 278        xfs_dir2_data_aoff_t        offset = 0;        /* offset for new entry */
 279        int                        old_isize;        /* di_size before adding name */
 280        int                        pick;                /* which algorithm to use */
 281        xfs_dir2_sf_t                *sfp;                /* shortform structure */
 282        xfs_dir2_sf_entry_t        *sfep = NULL;        /* shortform entry */
 283
 284        xfs_dir2_trace_args("sf_addname", args);
 285        ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
 286        dp = args->dp;
 287        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 288        /*
 289         * Make sure the shortform value has some of its header.
 290         */
 291        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 292                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 293                return XFS_ERROR(EIO);
 294        }
 295        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 296        ASSERT(dp->i_df.if_u1.if_data != NULL);
 297        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 298        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
 299        /*
 300         * Compute entry (and change in) size.
 301         */
 302        add_entsize = xfs_dir2_sf_entsize_byname(sfp, args->namelen);
 303        incr_isize = add_entsize;
 304        objchange = 0;
 305#if XFS_BIG_INUMS
 306        /*
 307         * Do we have to change to 8 byte inodes?
 308         */
 309        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
 310                /*
 311                 * Yes, adjust the entry size and the total size.
 312                 */
 313                add_entsize +=
 314                        (uint)sizeof(xfs_dir2_ino8_t) -
 315                        (uint)sizeof(xfs_dir2_ino4_t);
 316                incr_isize +=
 317                        (sfp->hdr.count + 2) *
 318                        ((uint)sizeof(xfs_dir2_ino8_t) -
 319                         (uint)sizeof(xfs_dir2_ino4_t));
 320                objchange = 1;
 321        }
 322#endif
 323        old_isize = (int)dp->i_d.di_size;
 324        new_isize = old_isize + incr_isize;
 325        /*
 326         * Won't fit as shortform any more (due to size),
 327         * or the pick routine says it won't (due to offset values).
 328         */
 329        if (new_isize > XFS_IFORK_DSIZE(dp) ||
 330            (pick =
 331             xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
 332                /*
 333                 * Just checking or no space reservation, it doesn't fit.
 334                 */
 335                if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
 336                        return XFS_ERROR(ENOSPC);
 337                /*
 338                 * Convert to block form then add the name.
 339                 */
 340                error = xfs_dir2_sf_to_block(args);
 341                if (error)
 342                        return error;
 343                return xfs_dir2_block_addname(args);
 344        }
 345        /*
 346         * Just checking, it fits.
 347         */
 348        if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 349                return 0;
 350        /*
 351         * Do it the easy way - just add it at the end.
 352         */
 353        if (pick == 1)
 354                xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
 355        /*
 356         * Do it the hard way - look for a place to insert the new entry.
 357         * Convert to 8 byte inode numbers first if necessary.
 358         */
 359        else {
 360                ASSERT(pick == 2);
 361#if XFS_BIG_INUMS
 362                if (objchange)
 363                        xfs_dir2_sf_toino8(args);
 364#endif
 365                xfs_dir2_sf_addname_hard(args, objchange, new_isize);
 366        }
 367        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 368        return 0;
 369}
 370
 371/*
 372 * Add the new entry the "easy" way.
 373 * This is copying the old directory and adding the new entry at the end.
 374 * Since it's sorted by "offset" we need room after the last offset
 375 * that's already there, and then room to convert to a block directory.
 376 * This is already checked by the pick routine.
 377 */
 378static void
 379xfs_dir2_sf_addname_easy(
 380        xfs_da_args_t                *args,                /* operation arguments */
 381        xfs_dir2_sf_entry_t        *sfep,                /* pointer to new entry */
 382        xfs_dir2_data_aoff_t        offset,                /* offset to use for new ent */
 383        int                        new_isize)        /* new directory size */
 384{
 385        int                        byteoff;        /* byte offset in sf dir */
 386        xfs_inode_t                *dp;                /* incore directory inode */
 387        xfs_dir2_sf_t                *sfp;                /* shortform structure */
 388
 389        dp = args->dp;
 390
 391        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 392        byteoff = (int)((char *)sfep - (char *)sfp);
 393        /*
 394         * Grow the in-inode space.
 395         */
 396        xfs_idata_realloc(dp, xfs_dir2_sf_entsize_byname(sfp, args->namelen),
 397                XFS_DATA_FORK);
 398        /*
 399         * Need to set up again due to realloc of the inode data.
 400         */
 401        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 402        sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
 403        /*
 404         * Fill in the new entry.
 405         */
 406        sfep->namelen = args->namelen;
 407        xfs_dir2_sf_put_offset(sfep, offset);
 408        memcpy(sfep->name, args->name, sfep->namelen);
 409        xfs_dir2_sf_put_inumber(sfp, &args->inumber,
 410                xfs_dir2_sf_inumberp(sfep));
 411        /*
 412         * Update the header and inode.
 413         */
 414        sfp->hdr.count++;
 415#if XFS_BIG_INUMS
 416        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
 417                sfp->hdr.i8count++;
 418#endif
 419        dp->i_d.di_size = new_isize;
 420        xfs_dir2_sf_check(args);
 421}
 422
 423/*
 424 * Add the new entry the "hard" way.
 425 * The caller has already converted to 8 byte inode numbers if necessary,
 426 * in which case we need to leave the i8count at 1.
 427 * Find a hole that the new entry will fit into, and copy
 428 * the first part of the entries, the new entry, and the last part of
 429 * the entries.
 430 */
 431/* ARGSUSED */
 432static void
 433xfs_dir2_sf_addname_hard(
 434        xfs_da_args_t                *args,                /* operation arguments */
 435        int                        objchange,        /* changing inode number size */
 436        int                        new_isize)        /* new directory size */
 437{
 438        int                        add_datasize;        /* data size need for new ent */
 439        char                        *buf;                /* buffer for old */
 440        xfs_inode_t                *dp;                /* incore directory inode */
 441        int                        eof;                /* reached end of old dir */
 442        int                        nbytes;                /* temp for byte copies */
 443        xfs_dir2_data_aoff_t        new_offset;        /* next offset value */
 444        xfs_dir2_data_aoff_t        offset;                /* current offset value */
 445        int                        old_isize;        /* previous di_size */
 446        xfs_dir2_sf_entry_t        *oldsfep;        /* entry in original dir */
 447        xfs_dir2_sf_t                *oldsfp;        /* original shortform dir */
 448        xfs_dir2_sf_entry_t        *sfep;                /* entry in new dir */
 449        xfs_dir2_sf_t                *sfp;                /* new shortform dir */
 450
 451        /*
 452         * Copy the old directory to the stack buffer.
 453         */
 454        dp = args->dp;
 455
 456        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 457        old_isize = (int)dp->i_d.di_size;
 458        buf = kmem_alloc(old_isize, KM_SLEEP);
 459        oldsfp = (xfs_dir2_sf_t *)buf;
 460        memcpy(oldsfp, sfp, old_isize);
 461        /*
 462         * Loop over the old directory finding the place we're going
 463         * to insert the new entry.
 464         * If it's going to end up at the end then oldsfep will point there.
 465         */
 466        for (offset = XFS_DIR2_DATA_FIRST_OFFSET,
 467              oldsfep = xfs_dir2_sf_firstentry(oldsfp),
 468              add_datasize = xfs_dir2_data_entsize(args->namelen),
 469              eof = (char *)oldsfep == &buf[old_isize];
 470             !eof;
 471             offset = new_offset + xfs_dir2_data_entsize(oldsfep->namelen),
 472              oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep),
 473              eof = (char *)oldsfep == &buf[old_isize]) {
 474                new_offset = xfs_dir2_sf_get_offset(oldsfep);
 475                if (offset + add_datasize <= new_offset)
 476                        break;
 477        }
 478        /*
 479         * Get rid of the old directory, then allocate space for
 480         * the new one.  We do this so xfs_idata_realloc won't copy
 481         * the data.
 482         */
 483        xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
 484        xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
 485        /*
 486         * Reset the pointer since the buffer was reallocated.
 487         */
 488        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 489        /*
 490         * Copy the first part of the directory, including the header.
 491         */
 492        nbytes = (int)((char *)oldsfep - (char *)oldsfp);
 493        memcpy(sfp, oldsfp, nbytes);
 494        sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
 495        /*
 496         * Fill in the new entry, and update the header counts.
 497         */
 498        sfep->namelen = args->namelen;
 499        xfs_dir2_sf_put_offset(sfep, offset);
 500        memcpy(sfep->name, args->name, sfep->namelen);
 501        xfs_dir2_sf_put_inumber(sfp, &args->inumber,
 502                xfs_dir2_sf_inumberp(sfep));
 503        sfp->hdr.count++;
 504#if XFS_BIG_INUMS
 505        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
 506                sfp->hdr.i8count++;
 507#endif
 508        /*
 509         * If there's more left to copy, do that.
 510         */
 511        if (!eof) {
 512                sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 513                memcpy(sfep, oldsfep, old_isize - nbytes);
 514        }
 515        kmem_free(buf);
 516        dp->i_d.di_size = new_isize;
 517        xfs_dir2_sf_check(args);
 518}
 519
 520/*
 521 * Decide if the new entry will fit at all.
 522 * If it will fit, pick between adding the new entry to the end (easy)
 523 * or somewhere else (hard).
 524 * Return 0 (won't fit), 1 (easy), 2 (hard).
 525 */
 526/*ARGSUSED*/
 527static int                                        /* pick result */
 528xfs_dir2_sf_addname_pick(
 529        xfs_da_args_t                *args,                /* operation arguments */
 530        int                        objchange,        /* inode # size changes */
 531        xfs_dir2_sf_entry_t        **sfepp,        /* out(1): new entry ptr */
 532        xfs_dir2_data_aoff_t        *offsetp)        /* out(1): new offset */
 533{
 534        xfs_inode_t                *dp;                /* incore directory inode */
 535        int                        holefit;        /* found hole it will fit in */
 536        int                        i;                /* entry number */
 537        xfs_mount_t                *mp;                /* filesystem mount point */
 538        xfs_dir2_data_aoff_t        offset;                /* data block offset */
 539        xfs_dir2_sf_entry_t        *sfep;                /* shortform entry */
 540        xfs_dir2_sf_t                *sfp;                /* shortform structure */
 541        int                        size;                /* entry's data size */
 542        int                        used;                /* data bytes used */
 543
 544        dp = args->dp;
 545        mp = dp->i_mount;
 546
 547        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 548        size = xfs_dir2_data_entsize(args->namelen);
 549        offset = XFS_DIR2_DATA_FIRST_OFFSET;
 550        sfep = xfs_dir2_sf_firstentry(sfp);
 551        holefit = 0;
 552        /*
 553         * Loop over sf entries.
 554         * Keep track of data offset and whether we've seen a place
 555         * to insert the new entry.
 556         */
 557        for (i = 0; i < sfp->hdr.count; i++) {
 558                if (!holefit)
 559                        holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
 560                offset = xfs_dir2_sf_get_offset(sfep) +
 561                         xfs_dir2_data_entsize(sfep->namelen);
 562                sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 563        }
 564        /*
 565         * Calculate data bytes used excluding the new entry, if this
 566         * was a data block (block form directory).
 567         */
 568        used = offset +
 569               (sfp->hdr.count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 570               (uint)sizeof(xfs_dir2_block_tail_t);
 571        /*
 572         * If it won't fit in a block form then we can't insert it,
 573         * we'll go back, convert to block, then try the insert and convert
 574         * to leaf.
 575         */
 576        if (used + (holefit ? 0 : size) > mp->m_dirblksize)
 577                return 0;
 578        /*
 579         * If changing the inode number size, do it the hard way.
 580         */
 581#if XFS_BIG_INUMS
 582        if (objchange) {
 583                return 2;
 584        }
 585#else
 586        ASSERT(objchange == 0);
 587#endif
 588        /*
 589         * If it won't fit at the end then do it the hard way (use the hole).
 590         */
 591        if (used + size > mp->m_dirblksize)
 592                return 2;
 593        /*
 594         * Do it the easy way.
 595         */
 596        *sfepp = sfep;
 597        *offsetp = offset;
 598        return 1;
 599}
 600
 601#ifdef DEBUG
 602/*
 603 * Check consistency of shortform directory, assert if bad.
 604 */
 605static void
 606xfs_dir2_sf_check(
 607        xfs_da_args_t                *args)                /* operation arguments */
 608{
 609        xfs_inode_t                *dp;                /* incore directory inode */
 610        int                        i;                /* entry number */
 611        int                        i8count;        /* number of big inode#s */
 612        xfs_ino_t                ino;                /* entry inode number */
 613        int                        offset;                /* data offset */
 614        xfs_dir2_sf_entry_t        *sfep;                /* shortform dir entry */
 615        xfs_dir2_sf_t                *sfp;                /* shortform structure */
 616
 617        dp = args->dp;
 618
 619        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 620        offset = XFS_DIR2_DATA_FIRST_OFFSET;
 621        ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
 622        i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 623
 624        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
 625             i < sfp->hdr.count;
 626             i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
 627                ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
 628                ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));
 629                i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 630                offset =
 631                        xfs_dir2_sf_get_offset(sfep) +
 632                        xfs_dir2_data_entsize(sfep->namelen);
 633        }
 634        ASSERT(i8count == sfp->hdr.i8count);
 635        ASSERT(XFS_BIG_INUMS || i8count == 0);
 636        ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
 637        ASSERT(offset +
 638               (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 639               (uint)sizeof(xfs_dir2_block_tail_t) <=
 640               dp->i_mount->m_dirblksize);
 641}
 642#endif        /* DEBUG */
 643
 644/*
 645 * Create a new (shortform) directory.
 646 */
 647int                                        /* error, always 0 */
 648xfs_dir2_sf_create(
 649        xfs_da_args_t        *args,                /* operation arguments */
 650        xfs_ino_t        pino)                /* parent inode number */
 651{
 652        xfs_inode_t        *dp;                /* incore directory inode */
 653        int                i8count;        /* parent inode is an 8-byte number */
 654        xfs_dir2_sf_t        *sfp;                /* shortform structure */
 655        int                size;                /* directory size */
 656
 657        xfs_dir2_trace_args_i("sf_create", args, pino);
 658        dp = args->dp;
 659
 660        ASSERT(dp != NULL);
 661        ASSERT(dp->i_d.di_size == 0);
 662        /*
 663         * If it's currently a zero-length extent file,
 664         * convert it to local format.
 665         */
 666        if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
 667                dp->i_df.if_flags &= ~XFS_IFEXTENTS;        /* just in case */
 668                dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 669                xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
 670                dp->i_df.if_flags |= XFS_IFINLINE;
 671        }
 672        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 673        ASSERT(dp->i_df.if_bytes == 0);
 674        i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
 675        size = xfs_dir2_sf_hdr_size(i8count);
 676        /*
 677         * Make a buffer for the data.
 678         */
 679        xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 680        /*
 681         * Fill in the header,
 682         */
 683        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 684        sfp->hdr.i8count = i8count;
 685        /*
 686         * Now can put in the inode number, since i8count is set.
 687         */
 688        xfs_dir2_sf_put_inumber(sfp, &pino, &sfp->hdr.parent);
 689        sfp->hdr.count = 0;
 690        dp->i_d.di_size = size;
 691        xfs_dir2_sf_check(args);
 692        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 693        return 0;
 694}
 695
 696int                                                /* error */
 697xfs_dir2_sf_getdents(
 698        xfs_inode_t                *dp,                /* incore directory inode */
 699        void                        *dirent,
 700        xfs_off_t                *offset,
 701        filldir_t                filldir)
 702{
 703        int                        i;                /* shortform entry number */
 704        xfs_mount_t                *mp;                /* filesystem mount point */
 705        xfs_dir2_dataptr_t        off;                /* current entry's offset */
 706        xfs_dir2_sf_entry_t        *sfep;                /* shortform directory entry */
 707        xfs_dir2_sf_t                *sfp;                /* shortform structure */
 708        xfs_dir2_dataptr_t        dot_offset;
 709        xfs_dir2_dataptr_t        dotdot_offset;
 710        xfs_ino_t                ino;
 711
 712        mp = dp->i_mount;
 713
 714        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 715        /*
 716         * Give up if the directory is way too short.
 717         */
 718        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 719                ASSERT(XFS_FORCED_SHUTDOWN(mp));
 720                return XFS_ERROR(EIO);
 721        }
 722
 723        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 724        ASSERT(dp->i_df.if_u1.if_data != NULL);
 725
 726        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 727
 728        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
 729
 730        /*
 731         * If the block number in the offset is out of range, we're done.
 732         */
 733        if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk)
 734                return 0;
 735
 736        /*
 737         * Precalculate offsets for . and .. as we will always need them.
 738         *
 739         * XXX(hch): the second argument is sometimes 0 and sometimes
 740         * mp->m_dirdatablk.
 741         */
 742        dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 743                                             XFS_DIR2_DATA_DOT_OFFSET);
 744        dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 745                                                XFS_DIR2_DATA_DOTDOT_OFFSET);
 746
 747        /*
 748         * Put . entry unless we're starting past it.
 749         */
 750        if (*offset <= dot_offset) {
 751                ino = dp->i_ino;
 752#if XFS_BIG_INUMS
 753                ino += mp->m_inoadd;
 754#endif
 755                if (filldir(dirent, ".", 1, dot_offset, ino, DT_DIR)) {
 756                        *offset = dot_offset;
 757                        return 0;
 758                }
 759        }
 760
 761        /*
 762         * Put .. entry unless we're starting past it.
 763         */
 764        if (*offset <= dotdot_offset) {
 765                ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
 766#if XFS_BIG_INUMS
 767                ino += mp->m_inoadd;
 768#endif
 769                if (filldir(dirent, "..", 2, dotdot_offset, ino, DT_DIR)) {
 770                        *offset = dotdot_offset;
 771                        return 0;
 772                }
 773        }
 774
 775        /*
 776         * Loop while there are more entries and put'ing works.
 777         */
 778        sfep = xfs_dir2_sf_firstentry(sfp);
 779        for (i = 0; i < sfp->hdr.count; i++) {
 780                off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 781                                xfs_dir2_sf_get_offset(sfep));
 782
 783                if (*offset > off) {
 784                        sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 785                        continue;
 786                }
 787
 788                ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));
 789#if XFS_BIG_INUMS
 790                ino += mp->m_inoadd;
 791#endif
 792
 793                if (filldir(dirent, sfep->name, sfep->namelen,
 794                                            off, ino, DT_UNKNOWN)) {
 795                        *offset = off;
 796                        return 0;
 797                }
 798                sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 799        }
 800
 801        *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0);
 802        return 0;
 803}
 804
 805/*
 806 * Lookup an entry in a shortform directory.
 807 * Returns EEXIST if found, ENOENT if not found.
 808 */
 809int                                                /* error */
 810xfs_dir2_sf_lookup(
 811        xfs_da_args_t                *args)                /* operation arguments */
 812{
 813        xfs_inode_t                *dp;                /* incore directory inode */
 814        int                        i;                /* entry index */
 815        int                        error;
 816        xfs_dir2_sf_entry_t        *sfep;                /* shortform directory entry */
 817        xfs_dir2_sf_t                *sfp;                /* shortform structure */
 818        enum xfs_dacmp                cmp;                /* comparison result */
 819        xfs_dir2_sf_entry_t        *ci_sfep;        /* case-insens. entry */
 820
 821        xfs_dir2_trace_args("sf_lookup", args);
 822        xfs_dir2_sf_check(args);
 823        dp = args->dp;
 824
 825        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 826        /*
 827         * Bail out if the directory is way too short.
 828         */
 829        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 830                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 831                return XFS_ERROR(EIO);
 832        }
 833        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 834        ASSERT(dp->i_df.if_u1.if_data != NULL);
 835        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 836        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
 837        /*
 838         * Special case for .
 839         */
 840        if (args->namelen == 1 && args->name[0] == '.') {
 841                args->inumber = dp->i_ino;
 842                args->cmpresult = XFS_CMP_EXACT;
 843                return XFS_ERROR(EEXIST);
 844        }
 845        /*
 846         * Special case for ..
 847         */
 848        if (args->namelen == 2 &&
 849            args->name[0] == '.' && args->name[1] == '.') {
 850                args->inumber = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
 851                args->cmpresult = XFS_CMP_EXACT;
 852                return XFS_ERROR(EEXIST);
 853        }
 854        /*
 855         * Loop over all the entries trying to match ours.
 856         */
 857        ci_sfep = NULL;
 858        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->hdr.count;
 859                                i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
 860                /*
 861                 * Compare name and if it's an exact match, return the inode
 862                 * number. If it's the first case-insensitive match, store the
 863                 * inode number and continue looking for an exact match.
 864                 */
 865                cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
 866                                                                sfep->namelen);
 867                if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
 868                        args->cmpresult = cmp;
 869                        args->inumber = xfs_dir2_sf_get_inumber(sfp,
 870                                                xfs_dir2_sf_inumberp(sfep));
 871                        if (cmp == XFS_CMP_EXACT)
 872                                return XFS_ERROR(EEXIST);
 873                        ci_sfep = sfep;
 874                }
 875        }
 876        ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 877        /*
 878         * Here, we can only be doing a lookup (not a rename or replace).
 879         * If a case-insensitive match was not found, return ENOENT.
 880         */
 881        if (!ci_sfep)
 882                return XFS_ERROR(ENOENT);
 883        /* otherwise process the CI match as required by the caller */
 884        error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
 885        return XFS_ERROR(error);
 886}
 887
 888/*
 889 * Remove an entry from a shortform directory.
 890 */
 891int                                                /* error */
 892xfs_dir2_sf_removename(
 893        xfs_da_args_t                *args)
 894{
 895        int                        byteoff;        /* offset of removed entry */
 896        xfs_inode_t                *dp;                /* incore directory inode */
 897        int                        entsize;        /* this entry's size */
 898        int                        i;                /* shortform entry index */
 899        int                        newsize;        /* new inode size */
 900        int                        oldsize;        /* old inode size */
 901        xfs_dir2_sf_entry_t        *sfep;                /* shortform directory entry */
 902        xfs_dir2_sf_t                *sfp;                /* shortform structure */
 903
 904        xfs_dir2_trace_args("sf_removename", args);
 905        dp = args->dp;
 906
 907        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 908        oldsize = (int)dp->i_d.di_size;
 909        /*
 910         * Bail out if the directory is way too short.
 911         */
 912        if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 913                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 914                return XFS_ERROR(EIO);
 915        }
 916        ASSERT(dp->i_df.if_bytes == oldsize);
 917        ASSERT(dp->i_df.if_u1.if_data != NULL);
 918        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 919        ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
 920        /*
 921         * Loop over the old directory entries.
 922         * Find the one we're deleting.
 923         */
 924        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->hdr.count;
 925                                i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
 926                if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
 927                                                                XFS_CMP_EXACT) {
 928                        ASSERT(xfs_dir2_sf_get_inumber(sfp,
 929                                                xfs_dir2_sf_inumberp(sfep)) ==
 930                                                                args->inumber);
 931                        break;
 932                }
 933        }
 934        /*
 935         * Didn't find it.
 936         */
 937        if (i == sfp->hdr.count)
 938                return XFS_ERROR(ENOENT);
 939        /*
 940         * Calculate sizes.
 941         */
 942        byteoff = (int)((char *)sfep - (char *)sfp);
 943        entsize = xfs_dir2_sf_entsize_byname(sfp, args->namelen);
 944        newsize = oldsize - entsize;
 945        /*
 946         * Copy the part if any after the removed entry, sliding it down.
 947         */
 948        if (byteoff + entsize < oldsize)
 949                memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
 950                        oldsize - (byteoff + entsize));
 951        /*
 952         * Fix up the header and file size.
 953         */
 954        sfp->hdr.count--;
 955        dp->i_d.di_size = newsize;
 956        /*
 957         * Reallocate, making it smaller.
 958         */
 959        xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
 960        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 961#if XFS_BIG_INUMS
 962        /*
 963         * Are we changing inode number size?
 964         */
 965        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
 966                if (sfp->hdr.i8count == 1)
 967                        xfs_dir2_sf_toino4(args);
 968                else
 969                        sfp->hdr.i8count--;
 970        }
 971#endif
 972        xfs_dir2_sf_check(args);
 973        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 974        return 0;
 975}
 976
 977/*
 978 * Replace the inode number of an entry in a shortform directory.
 979 */
 980int                                                /* error */
 981xfs_dir2_sf_replace(
 982        xfs_da_args_t                *args)                /* operation arguments */
 983{
 984        xfs_inode_t                *dp;                /* incore directory inode */
 985        int                        i;                /* entry index */
 986#if XFS_BIG_INUMS || defined(DEBUG)
 987        xfs_ino_t                ino=0;                /* entry old inode number */
 988#endif
 989#if XFS_BIG_INUMS
 990        int                        i8elevated;        /* sf_toino8 set i8count=1 */
 991#endif
 992        xfs_dir2_sf_entry_t        *sfep;                /* shortform directory entry */
 993        xfs_dir2_sf_t                *sfp;                /* shortform structure */
 994
 995        xfs_dir2_trace_args("sf_replace", args);
 996        dp = args->dp;
 997
 998        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 999        /*
1000         * Bail out if the shortform directory is way too small.
1001         */
1002        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1003                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
1004                return XFS_ERROR(EIO);
1005        }
1006        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1007        ASSERT(dp->i_df.if_u1.if_data != NULL);
1008        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1009        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
1010#if XFS_BIG_INUMS
1011        /*
1012         * New inode number is large, and need to convert to 8-byte inodes.
1013         */
1014        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
1015                int        error;                        /* error return value */
1016                int        newsize;                /* new inode size */
1017
1018                newsize =
1019                        dp->i_df.if_bytes +
1020                        (sfp->hdr.count + 1) *
1021                        ((uint)sizeof(xfs_dir2_ino8_t) -
1022                         (uint)sizeof(xfs_dir2_ino4_t));
1023                /*
1024                 * Won't fit as shortform, convert to block then do replace.
1025                 */
1026                if (newsize > XFS_IFORK_DSIZE(dp)) {
1027                        error = xfs_dir2_sf_to_block(args);
1028                        if (error) {
1029                                return error;
1030                        }
1031                        return xfs_dir2_block_replace(args);
1032                }
1033                /*
1034                 * Still fits, convert to 8-byte now.
1035                 */
1036                xfs_dir2_sf_toino8(args);
1037                i8elevated = 1;
1038                sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1039        } else
1040                i8elevated = 0;
1041#endif
1042        ASSERT(args->namelen != 1 || args->name[0] != '.');
1043        /*
1044         * Replace ..'s entry.
1045         */
1046        if (args->namelen == 2 &&
1047            args->name[0] == '.' && args->name[1] == '.') {
1048#if XFS_BIG_INUMS || defined(DEBUG)
1049                ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
1050                ASSERT(args->inumber != ino);
1051#endif
1052                xfs_dir2_sf_put_inumber(sfp, &args->inumber, &sfp->hdr.parent);
1053        }
1054        /*
1055         * Normal entry, look for the name.
1056         */
1057        else {
1058                for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
1059                                i < sfp->hdr.count;
1060                                i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
1061                        if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1062                                                                XFS_CMP_EXACT) {
1063#if XFS_BIG_INUMS || defined(DEBUG)
1064                                ino = xfs_dir2_sf_get_inumber(sfp,
1065                                        xfs_dir2_sf_inumberp(sfep));
1066                                ASSERT(args->inumber != ino);
1067#endif
1068                                xfs_dir2_sf_put_inumber(sfp, &args->inumber,
1069                                        xfs_dir2_sf_inumberp(sfep));
1070                                break;
1071                        }
1072                }
1073                /*
1074                 * Didn't find it.
1075                 */
1076                if (i == sfp->hdr.count) {
1077                        ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1078#if XFS_BIG_INUMS
1079                        if (i8elevated)
1080                                xfs_dir2_sf_toino4(args);
1081#endif
1082                        return XFS_ERROR(ENOENT);
1083                }
1084        }
1085#if XFS_BIG_INUMS
1086        /*
1087         * See if the old number was large, the new number is small.
1088         */
1089        if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1090            args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1091                /*
1092                 * And the old count was one, so need to convert to small.
1093                 */
1094                if (sfp->hdr.i8count == 1)
1095                        xfs_dir2_sf_toino4(args);
1096                else
1097                        sfp->hdr.i8count--;
1098        }
1099        /*
1100         * See if the old number was small, the new number is large.
1101         */
1102        if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1103            args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1104                /*
1105                 * add to the i8count unless we just converted to 8-byte
1106                 * inodes (which does an implied i8count = 1)
1107                 */
1108                ASSERT(sfp->hdr.i8count != 0);
1109                if (!i8elevated)
1110                        sfp->hdr.i8count++;
1111        }
1112#endif
1113        xfs_dir2_sf_check(args);
1114        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1115        return 0;
1116}
1117
1118#if XFS_BIG_INUMS
1119/*
1120 * Convert from 8-byte inode numbers to 4-byte inode numbers.
1121 * The last 8-byte inode number is gone, but the count is still 1.
1122 */
1123static void
1124xfs_dir2_sf_toino4(
1125        xfs_da_args_t                *args)                /* operation arguments */
1126{
1127        char                        *buf;                /* old dir's buffer */
1128        xfs_inode_t                *dp;                /* incore directory inode */
1129        int                        i;                /* entry index */
1130        xfs_ino_t                ino;                /* entry inode number */
1131        int                        newsize;        /* new inode size */
1132        xfs_dir2_sf_entry_t        *oldsfep;        /* old sf entry */
1133        xfs_dir2_sf_t                *oldsfp;        /* old sf directory */
1134        int                        oldsize;        /* old inode size */
1135        xfs_dir2_sf_entry_t        *sfep;                /* new sf entry */
1136        xfs_dir2_sf_t                *sfp;                /* new sf directory */
1137
1138        xfs_dir2_trace_args("sf_toino4", args);
1139        dp = args->dp;
1140
1141        /*
1142         * Copy the old directory to the buffer.
1143         * Then nuke it from the inode, and add the new buffer to the inode.
1144         * Don't want xfs_idata_realloc copying the data here.
1145         */
1146        oldsize = dp->i_df.if_bytes;
1147        buf = kmem_alloc(oldsize, KM_SLEEP);
1148        oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1149        ASSERT(oldsfp->hdr.i8count == 1);
1150        memcpy(buf, oldsfp, oldsize);
1151        /*
1152         * Compute the new inode size.
1153         */
1154        newsize =
1155                oldsize -
1156                (oldsfp->hdr.count + 1) *
1157                ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1158        xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1159        xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1160        /*
1161         * Reset our pointers, the data has moved.
1162         */
1163        oldsfp = (xfs_dir2_sf_t *)buf;
1164        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1165        /*
1166         * Fill in the new header.
1167         */
1168        sfp->hdr.count = oldsfp->hdr.count;
1169        sfp->hdr.i8count = 0;
1170        ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
1171        xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
1172        /*
1173         * Copy the entries field by field.
1174         */
1175        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1176                    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1177             i < sfp->hdr.count;
1178             i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1179                  oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1180                sfep->namelen = oldsfep->namelen;
1181                sfep->offset = oldsfep->offset;
1182                memcpy(sfep->name, oldsfep->name, sfep->namelen);
1183                ino = xfs_dir2_sf_get_inumber(oldsfp,
1184                        xfs_dir2_sf_inumberp(oldsfep));
1185                xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
1186        }
1187        /*
1188         * Clean up the inode.
1189         */
1190        kmem_free(buf);
1191        dp->i_d.di_size = newsize;
1192        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1193}
1194
1195/*
1196 * Convert from 4-byte inode numbers to 8-byte inode numbers.
1197 * The new 8-byte inode number is not there yet, we leave with the
1198 * count 1 but no corresponding entry.
1199 */
1200static void
1201xfs_dir2_sf_toino8(
1202        xfs_da_args_t                *args)                /* operation arguments */
1203{
1204        char                        *buf;                /* old dir's buffer */
1205        xfs_inode_t                *dp;                /* incore directory inode */
1206        int                        i;                /* entry index */
1207        xfs_ino_t                ino;                /* entry inode number */
1208        int                        newsize;        /* new inode size */
1209        xfs_dir2_sf_entry_t        *oldsfep;        /* old sf entry */
1210        xfs_dir2_sf_t                *oldsfp;        /* old sf directory */
1211        int                        oldsize;        /* old inode size */
1212        xfs_dir2_sf_entry_t        *sfep;                /* new sf entry */
1213        xfs_dir2_sf_t                *sfp;                /* new sf directory */
1214
1215        xfs_dir2_trace_args("sf_toino8", args);
1216        dp = args->dp;
1217
1218        /*
1219         * Copy the old directory to the buffer.
1220         * Then nuke it from the inode, and add the new buffer to the inode.
1221         * Don't want xfs_idata_realloc copying the data here.
1222         */
1223        oldsize = dp->i_df.if_bytes;
1224        buf = kmem_alloc(oldsize, KM_SLEEP);
1225        oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1226        ASSERT(oldsfp->hdr.i8count == 0);
1227        memcpy(buf, oldsfp, oldsize);
1228        /*
1229         * Compute the new inode size.
1230         */
1231        newsize =
1232                oldsize +
1233                (oldsfp->hdr.count + 1) *
1234                ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1235        xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1236        xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1237        /*
1238         * Reset our pointers, the data has moved.
1239         */
1240        oldsfp = (xfs_dir2_sf_t *)buf;
1241        sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1242        /*
1243         * Fill in the new header.
1244         */
1245        sfp->hdr.count = oldsfp->hdr.count;
1246        sfp->hdr.i8count = 1;
1247        ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
1248        xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
1249        /*
1250         * Copy the entries field by field.
1251         */
1252        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1253                    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1254             i < sfp->hdr.count;
1255             i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1256                  oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1257                sfep->namelen = oldsfep->namelen;
1258                sfep->offset = oldsfep->offset;
1259                memcpy(sfep->name, oldsfep->name, sfep->namelen);
1260                ino = xfs_dir2_sf_get_inumber(oldsfp,
1261                        xfs_dir2_sf_inumberp(oldsfep));
1262                xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
1263        }
1264        /*
1265         * Clean up the inode.
1266         */
1267        kmem_free(buf);
1268        dp->i_d.di_size = newsize;
1269        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1270}
1271#endif        /* XFS_BIG_INUMS */
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