linux/fs/xfs/libxfs/xfs_dir2_sf.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   4 * All Rights Reserved.
   5 */
   6#include "xfs.h"
   7#include "xfs_fs.h"
   8#include "xfs_shared.h"
   9#include "xfs_format.h"
  10#include "xfs_log_format.h"
  11#include "xfs_trans_resv.h"
  12#include "xfs_mount.h"
  13#include "xfs_inode.h"
  14#include "xfs_trans.h"
  15#include "xfs_dir2.h"
  16#include "xfs_dir2_priv.h"
  17#include "xfs_trace.h"
  18
  19/*
  20 * Prototypes for internal functions.
  21 */
  22static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
  23                                     xfs_dir2_sf_entry_t *sfep,
  24                                     xfs_dir2_data_aoff_t offset,
  25                                     int new_isize);
  26static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
  27                                     int new_isize);
  28static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
  29                                    xfs_dir2_sf_entry_t **sfepp,
  30                                    xfs_dir2_data_aoff_t *offsetp);
  31#ifdef DEBUG
  32static void xfs_dir2_sf_check(xfs_da_args_t *args);
  33#else
  34#define xfs_dir2_sf_check(args)
  35#endif /* DEBUG */
  36
  37static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
  38static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
  39
  40/*
  41 * Given a block directory (dp/block), calculate its size as a shortform (sf)
  42 * directory and a header for the sf directory, if it will fit it the
  43 * space currently present in the inode.  If it won't fit, the output
  44 * size is too big (but not accurate).
  45 */
  46int                                             /* size for sf form */
  47xfs_dir2_block_sfsize(
  48        xfs_inode_t             *dp,            /* incore inode pointer */
  49        xfs_dir2_data_hdr_t     *hdr,           /* block directory data */
  50        xfs_dir2_sf_hdr_t       *sfhp)          /* output: header for sf form */
  51{
  52        xfs_dir2_dataptr_t      addr;           /* data entry address */
  53        xfs_dir2_leaf_entry_t   *blp;           /* leaf area of the block */
  54        xfs_dir2_block_tail_t   *btp;           /* tail area of the block */
  55        int                     count;          /* shortform entry count */
  56        xfs_dir2_data_entry_t   *dep;           /* data entry in the block */
  57        int                     i;              /* block entry index */
  58        int                     i8count;        /* count of big-inode entries */
  59        int                     isdot;          /* entry is "." */
  60        int                     isdotdot;       /* entry is ".." */
  61        xfs_mount_t             *mp;            /* mount structure pointer */
  62        int                     namelen;        /* total name bytes */
  63        xfs_ino_t               parent = 0;     /* parent inode number */
  64        int                     size=0;         /* total computed size */
  65        int                     has_ftype;
  66        struct xfs_da_geometry  *geo;
  67
  68        mp = dp->i_mount;
  69        geo = mp->m_dir_geo;
  70
  71        /*
  72         * if there is a filetype field, add the extra byte to the namelen
  73         * for each entry that we see.
  74         */
  75        has_ftype = xfs_sb_version_hasftype(&mp->m_sb) ? 1 : 0;
  76
  77        count = i8count = namelen = 0;
  78        btp = xfs_dir2_block_tail_p(geo, hdr);
  79        blp = xfs_dir2_block_leaf_p(btp);
  80
  81        /*
  82         * Iterate over the block's data entries by using the leaf pointers.
  83         */
  84        for (i = 0; i < be32_to_cpu(btp->count); i++) {
  85                if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
  86                        continue;
  87                /*
  88                 * Calculate the pointer to the entry at hand.
  89                 */
  90                dep = (xfs_dir2_data_entry_t *)((char *)hdr +
  91                                xfs_dir2_dataptr_to_off(geo, addr));
  92                /*
  93                 * Detect . and .., so we can special-case them.
  94                 * . is not included in sf directories.
  95                 * .. is included by just the parent inode number.
  96                 */
  97                isdot = dep->namelen == 1 && dep->name[0] == '.';
  98                isdotdot =
  99                        dep->namelen == 2 &&
 100                        dep->name[0] == '.' && dep->name[1] == '.';
 101
 102                if (!isdot)
 103                        i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
 104
 105                /* take into account the file type field */
 106                if (!isdot && !isdotdot) {
 107                        count++;
 108                        namelen += dep->namelen + has_ftype;
 109                } else if (isdotdot)
 110                        parent = be64_to_cpu(dep->inumber);
 111                /*
 112                 * Calculate the new size, see if we should give up yet.
 113                 */
 114                size = xfs_dir2_sf_hdr_size(i8count) +  /* header */
 115                       count * 3 * sizeof(u8) +         /* namelen + offset */
 116                       namelen +                        /* name */
 117                       (i8count ?                       /* inumber */
 118                                count * XFS_INO64_SIZE :
 119                                count * XFS_INO32_SIZE);
 120                if (size > XFS_IFORK_DSIZE(dp))
 121                        return size;            /* size value is a failure */
 122        }
 123        /*
 124         * Create the output header, if it worked.
 125         */
 126        sfhp->count = count;
 127        sfhp->i8count = i8count;
 128        dp->d_ops->sf_put_parent_ino(sfhp, parent);
 129        return size;
 130}
 131
 132/*
 133 * Convert a block format directory to shortform.
 134 * Caller has already checked that it will fit, and built us a header.
 135 */
 136int                                             /* error */
 137xfs_dir2_block_to_sf(
 138        xfs_da_args_t           *args,          /* operation arguments */
 139        struct xfs_buf          *bp,
 140        int                     size,           /* shortform directory size */
 141        xfs_dir2_sf_hdr_t       *sfhp)          /* shortform directory hdr */
 142{
 143        xfs_dir2_data_hdr_t     *hdr;           /* block header */
 144        xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
 145        xfs_inode_t             *dp;            /* incore directory inode */
 146        xfs_dir2_data_unused_t  *dup;           /* unused data pointer */
 147        char                    *endptr;        /* end of data entries */
 148        int                     error;          /* error return value */
 149        int                     logflags;       /* inode logging flags */
 150        xfs_mount_t             *mp;            /* filesystem mount point */
 151        char                    *ptr;           /* current data pointer */
 152        xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 153        xfs_dir2_sf_hdr_t       *sfp;           /* shortform directory header */
 154        xfs_dir2_sf_hdr_t       *dst;           /* temporary data buffer */
 155
 156        trace_xfs_dir2_block_to_sf(args);
 157
 158        dp = args->dp;
 159        mp = dp->i_mount;
 160
 161        /*
 162         * allocate a temporary destination buffer the size of the inode
 163         * to format the data into. Once we have formatted the data, we
 164         * can free the block and copy the formatted data into the inode literal
 165         * area.
 166         */
 167        dst = kmem_alloc(mp->m_sb.sb_inodesize, 0);
 168        hdr = bp->b_addr;
 169
 170        /*
 171         * Copy the header into the newly allocate local space.
 172         */
 173        sfp = (xfs_dir2_sf_hdr_t *)dst;
 174        memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
 175
 176        /*
 177         * Set up to loop over the block's entries.
 178         */
 179        ptr = (char *)dp->d_ops->data_entry_p(hdr);
 180        endptr = xfs_dir3_data_endp(args->geo, hdr);
 181        sfep = xfs_dir2_sf_firstentry(sfp);
 182        /*
 183         * Loop over the active and unused entries.
 184         * Stop when we reach the leaf/tail portion of the block.
 185         */
 186        while (ptr < endptr) {
 187                /*
 188                 * If it's unused, just skip over it.
 189                 */
 190                dup = (xfs_dir2_data_unused_t *)ptr;
 191                if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 192                        ptr += be16_to_cpu(dup->length);
 193                        continue;
 194                }
 195                dep = (xfs_dir2_data_entry_t *)ptr;
 196                /*
 197                 * Skip .
 198                 */
 199                if (dep->namelen == 1 && dep->name[0] == '.')
 200                        ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
 201                /*
 202                 * Skip .., but make sure the inode number is right.
 203                 */
 204                else if (dep->namelen == 2 &&
 205                         dep->name[0] == '.' && dep->name[1] == '.')
 206                        ASSERT(be64_to_cpu(dep->inumber) ==
 207                               dp->d_ops->sf_get_parent_ino(sfp));
 208                /*
 209                 * Normal entry, copy it into shortform.
 210                 */
 211                else {
 212                        sfep->namelen = dep->namelen;
 213                        xfs_dir2_sf_put_offset(sfep,
 214                                (xfs_dir2_data_aoff_t)
 215                                ((char *)dep - (char *)hdr));
 216                        memcpy(sfep->name, dep->name, dep->namelen);
 217                        dp->d_ops->sf_put_ino(sfp, sfep,
 218                                              be64_to_cpu(dep->inumber));
 219                        dp->d_ops->sf_put_ftype(sfep,
 220                                        dp->d_ops->data_get_ftype(dep));
 221
 222                        sfep = dp->d_ops->sf_nextentry(sfp, sfep);
 223                }
 224                ptr += dp->d_ops->data_entsize(dep->namelen);
 225        }
 226        ASSERT((char *)sfep - (char *)sfp == size);
 227
 228        /* now we are done with the block, we can shrink the inode */
 229        logflags = XFS_ILOG_CORE;
 230        error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp);
 231        if (error) {
 232                ASSERT(error != -ENOSPC);
 233                goto out;
 234        }
 235
 236        /*
 237         * The buffer is now unconditionally gone, whether
 238         * xfs_dir2_shrink_inode worked or not.
 239         *
 240         * Convert the inode to local format and copy the data in.
 241         */
 242        ASSERT(dp->i_df.if_bytes == 0);
 243        xfs_init_local_fork(dp, XFS_DATA_FORK, dst, size);
 244        dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 245        dp->i_d.di_size = size;
 246
 247        logflags |= XFS_ILOG_DDATA;
 248        xfs_dir2_sf_check(args);
 249out:
 250        xfs_trans_log_inode(args->trans, dp, logflags);
 251        kmem_free(dst);
 252        return error;
 253}
 254
 255/*
 256 * Add a name to a shortform directory.
 257 * There are two algorithms, "easy" and "hard" which we decide on
 258 * before changing anything.
 259 * Convert to block form if necessary, if the new entry won't fit.
 260 */
 261int                                             /* error */
 262xfs_dir2_sf_addname(
 263        xfs_da_args_t           *args)          /* operation arguments */
 264{
 265        xfs_inode_t             *dp;            /* incore directory inode */
 266        int                     error;          /* error return value */
 267        int                     incr_isize;     /* total change in size */
 268        int                     new_isize;      /* di_size after adding name */
 269        int                     objchange;      /* changing to 8-byte inodes */
 270        xfs_dir2_data_aoff_t    offset = 0;     /* offset for new entry */
 271        int                     pick;           /* which algorithm to use */
 272        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 273        xfs_dir2_sf_entry_t     *sfep = NULL;   /* shortform entry */
 274
 275        trace_xfs_dir2_sf_addname(args);
 276
 277        ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
 278        dp = args->dp;
 279        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 280        /*
 281         * Make sure the shortform value has some of its header.
 282         */
 283        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 284                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 285                return -EIO;
 286        }
 287        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 288        ASSERT(dp->i_df.if_u1.if_data != NULL);
 289        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 290        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 291        /*
 292         * Compute entry (and change in) size.
 293         */
 294        incr_isize = dp->d_ops->sf_entsize(sfp, args->namelen);
 295        objchange = 0;
 296
 297        /*
 298         * Do we have to change to 8 byte inodes?
 299         */
 300        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
 301                /*
 302                 * Yes, adjust the inode size.  old count + (parent + new)
 303                 */
 304                incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
 305                objchange = 1;
 306        }
 307
 308        new_isize = (int)dp->i_d.di_size + incr_isize;
 309        /*
 310         * Won't fit as shortform any more (due to size),
 311         * or the pick routine says it won't (due to offset values).
 312         */
 313        if (new_isize > XFS_IFORK_DSIZE(dp) ||
 314            (pick =
 315             xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
 316                /*
 317                 * Just checking or no space reservation, it doesn't fit.
 318                 */
 319                if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
 320                        return -ENOSPC;
 321                /*
 322                 * Convert to block form then add the name.
 323                 */
 324                error = xfs_dir2_sf_to_block(args);
 325                if (error)
 326                        return error;
 327                return xfs_dir2_block_addname(args);
 328        }
 329        /*
 330         * Just checking, it fits.
 331         */
 332        if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 333                return 0;
 334        /*
 335         * Do it the easy way - just add it at the end.
 336         */
 337        if (pick == 1)
 338                xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
 339        /*
 340         * Do it the hard way - look for a place to insert the new entry.
 341         * Convert to 8 byte inode numbers first if necessary.
 342         */
 343        else {
 344                ASSERT(pick == 2);
 345                if (objchange)
 346                        xfs_dir2_sf_toino8(args);
 347                xfs_dir2_sf_addname_hard(args, objchange, new_isize);
 348        }
 349        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 350        return 0;
 351}
 352
 353/*
 354 * Add the new entry the "easy" way.
 355 * This is copying the old directory and adding the new entry at the end.
 356 * Since it's sorted by "offset" we need room after the last offset
 357 * that's already there, and then room to convert to a block directory.
 358 * This is already checked by the pick routine.
 359 */
 360static void
 361xfs_dir2_sf_addname_easy(
 362        xfs_da_args_t           *args,          /* operation arguments */
 363        xfs_dir2_sf_entry_t     *sfep,          /* pointer to new entry */
 364        xfs_dir2_data_aoff_t    offset,         /* offset to use for new ent */
 365        int                     new_isize)      /* new directory size */
 366{
 367        int                     byteoff;        /* byte offset in sf dir */
 368        xfs_inode_t             *dp;            /* incore directory inode */
 369        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 370
 371        dp = args->dp;
 372
 373        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 374        byteoff = (int)((char *)sfep - (char *)sfp);
 375        /*
 376         * Grow the in-inode space.
 377         */
 378        xfs_idata_realloc(dp, dp->d_ops->sf_entsize(sfp, args->namelen),
 379                          XFS_DATA_FORK);
 380        /*
 381         * Need to set up again due to realloc of the inode data.
 382         */
 383        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 384        sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
 385        /*
 386         * Fill in the new entry.
 387         */
 388        sfep->namelen = args->namelen;
 389        xfs_dir2_sf_put_offset(sfep, offset);
 390        memcpy(sfep->name, args->name, sfep->namelen);
 391        dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
 392        dp->d_ops->sf_put_ftype(sfep, args->filetype);
 393
 394        /*
 395         * Update the header and inode.
 396         */
 397        sfp->count++;
 398        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
 399                sfp->i8count++;
 400        dp->i_d.di_size = new_isize;
 401        xfs_dir2_sf_check(args);
 402}
 403
 404/*
 405 * Add the new entry the "hard" way.
 406 * The caller has already converted to 8 byte inode numbers if necessary,
 407 * in which case we need to leave the i8count at 1.
 408 * Find a hole that the new entry will fit into, and copy
 409 * the first part of the entries, the new entry, and the last part of
 410 * the entries.
 411 */
 412/* ARGSUSED */
 413static void
 414xfs_dir2_sf_addname_hard(
 415        xfs_da_args_t           *args,          /* operation arguments */
 416        int                     objchange,      /* changing inode number size */
 417        int                     new_isize)      /* new directory size */
 418{
 419        int                     add_datasize;   /* data size need for new ent */
 420        char                    *buf;           /* buffer for old */
 421        xfs_inode_t             *dp;            /* incore directory inode */
 422        int                     eof;            /* reached end of old dir */
 423        int                     nbytes;         /* temp for byte copies */
 424        xfs_dir2_data_aoff_t    new_offset;     /* next offset value */
 425        xfs_dir2_data_aoff_t    offset;         /* current offset value */
 426        int                     old_isize;      /* previous di_size */
 427        xfs_dir2_sf_entry_t     *oldsfep;       /* entry in original dir */
 428        xfs_dir2_sf_hdr_t       *oldsfp;        /* original shortform dir */
 429        xfs_dir2_sf_entry_t     *sfep;          /* entry in new dir */
 430        xfs_dir2_sf_hdr_t       *sfp;           /* new shortform dir */
 431
 432        /*
 433         * Copy the old directory to the stack buffer.
 434         */
 435        dp = args->dp;
 436
 437        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 438        old_isize = (int)dp->i_d.di_size;
 439        buf = kmem_alloc(old_isize, 0);
 440        oldsfp = (xfs_dir2_sf_hdr_t *)buf;
 441        memcpy(oldsfp, sfp, old_isize);
 442        /*
 443         * Loop over the old directory finding the place we're going
 444         * to insert the new entry.
 445         * If it's going to end up at the end then oldsfep will point there.
 446         */
 447        for (offset = dp->d_ops->data_first_offset,
 448              oldsfep = xfs_dir2_sf_firstentry(oldsfp),
 449              add_datasize = dp->d_ops->data_entsize(args->namelen),
 450              eof = (char *)oldsfep == &buf[old_isize];
 451             !eof;
 452             offset = new_offset + dp->d_ops->data_entsize(oldsfep->namelen),
 453              oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep),
 454              eof = (char *)oldsfep == &buf[old_isize]) {
 455                new_offset = xfs_dir2_sf_get_offset(oldsfep);
 456                if (offset + add_datasize <= new_offset)
 457                        break;
 458        }
 459        /*
 460         * Get rid of the old directory, then allocate space for
 461         * the new one.  We do this so xfs_idata_realloc won't copy
 462         * the data.
 463         */
 464        xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
 465        xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
 466        /*
 467         * Reset the pointer since the buffer was reallocated.
 468         */
 469        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 470        /*
 471         * Copy the first part of the directory, including the header.
 472         */
 473        nbytes = (int)((char *)oldsfep - (char *)oldsfp);
 474        memcpy(sfp, oldsfp, nbytes);
 475        sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
 476        /*
 477         * Fill in the new entry, and update the header counts.
 478         */
 479        sfep->namelen = args->namelen;
 480        xfs_dir2_sf_put_offset(sfep, offset);
 481        memcpy(sfep->name, args->name, sfep->namelen);
 482        dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
 483        dp->d_ops->sf_put_ftype(sfep, args->filetype);
 484        sfp->count++;
 485        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
 486                sfp->i8count++;
 487        /*
 488         * If there's more left to copy, do that.
 489         */
 490        if (!eof) {
 491                sfep = dp->d_ops->sf_nextentry(sfp, sfep);
 492                memcpy(sfep, oldsfep, old_isize - nbytes);
 493        }
 494        kmem_free(buf);
 495        dp->i_d.di_size = new_isize;
 496        xfs_dir2_sf_check(args);
 497}
 498
 499/*
 500 * Decide if the new entry will fit at all.
 501 * If it will fit, pick between adding the new entry to the end (easy)
 502 * or somewhere else (hard).
 503 * Return 0 (won't fit), 1 (easy), 2 (hard).
 504 */
 505/*ARGSUSED*/
 506static int                                      /* pick result */
 507xfs_dir2_sf_addname_pick(
 508        xfs_da_args_t           *args,          /* operation arguments */
 509        int                     objchange,      /* inode # size changes */
 510        xfs_dir2_sf_entry_t     **sfepp,        /* out(1): new entry ptr */
 511        xfs_dir2_data_aoff_t    *offsetp)       /* out(1): new offset */
 512{
 513        xfs_inode_t             *dp;            /* incore directory inode */
 514        int                     holefit;        /* found hole it will fit in */
 515        int                     i;              /* entry number */
 516        xfs_dir2_data_aoff_t    offset;         /* data block offset */
 517        xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 518        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 519        int                     size;           /* entry's data size */
 520        int                     used;           /* data bytes used */
 521
 522        dp = args->dp;
 523
 524        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 525        size = dp->d_ops->data_entsize(args->namelen);
 526        offset = dp->d_ops->data_first_offset;
 527        sfep = xfs_dir2_sf_firstentry(sfp);
 528        holefit = 0;
 529        /*
 530         * Loop over sf entries.
 531         * Keep track of data offset and whether we've seen a place
 532         * to insert the new entry.
 533         */
 534        for (i = 0; i < sfp->count; i++) {
 535                if (!holefit)
 536                        holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
 537                offset = xfs_dir2_sf_get_offset(sfep) +
 538                         dp->d_ops->data_entsize(sfep->namelen);
 539                sfep = dp->d_ops->sf_nextentry(sfp, sfep);
 540        }
 541        /*
 542         * Calculate data bytes used excluding the new entry, if this
 543         * was a data block (block form directory).
 544         */
 545        used = offset +
 546               (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 547               (uint)sizeof(xfs_dir2_block_tail_t);
 548        /*
 549         * If it won't fit in a block form then we can't insert it,
 550         * we'll go back, convert to block, then try the insert and convert
 551         * to leaf.
 552         */
 553        if (used + (holefit ? 0 : size) > args->geo->blksize)
 554                return 0;
 555        /*
 556         * If changing the inode number size, do it the hard way.
 557         */
 558        if (objchange)
 559                return 2;
 560        /*
 561         * If it won't fit at the end then do it the hard way (use the hole).
 562         */
 563        if (used + size > args->geo->blksize)
 564                return 2;
 565        /*
 566         * Do it the easy way.
 567         */
 568        *sfepp = sfep;
 569        *offsetp = offset;
 570        return 1;
 571}
 572
 573#ifdef DEBUG
 574/*
 575 * Check consistency of shortform directory, assert if bad.
 576 */
 577static void
 578xfs_dir2_sf_check(
 579        xfs_da_args_t           *args)          /* operation arguments */
 580{
 581        xfs_inode_t             *dp;            /* incore directory inode */
 582        int                     i;              /* entry number */
 583        int                     i8count;        /* number of big inode#s */
 584        xfs_ino_t               ino;            /* entry inode number */
 585        int                     offset;         /* data offset */
 586        xfs_dir2_sf_entry_t     *sfep;          /* shortform dir entry */
 587        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 588
 589        dp = args->dp;
 590
 591        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 592        offset = dp->d_ops->data_first_offset;
 593        ino = dp->d_ops->sf_get_parent_ino(sfp);
 594        i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 595
 596        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
 597             i < sfp->count;
 598             i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 599                ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
 600                ino = dp->d_ops->sf_get_ino(sfp, sfep);
 601                i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 602                offset =
 603                        xfs_dir2_sf_get_offset(sfep) +
 604                        dp->d_ops->data_entsize(sfep->namelen);
 605                ASSERT(dp->d_ops->sf_get_ftype(sfep) < XFS_DIR3_FT_MAX);
 606        }
 607        ASSERT(i8count == sfp->i8count);
 608        ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
 609        ASSERT(offset +
 610               (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 611               (uint)sizeof(xfs_dir2_block_tail_t) <= args->geo->blksize);
 612}
 613#endif  /* DEBUG */
 614
 615/* Verify the consistency of an inline directory. */
 616xfs_failaddr_t
 617xfs_dir2_sf_verify(
 618        struct xfs_inode                *ip)
 619{
 620        struct xfs_mount                *mp = ip->i_mount;
 621        struct xfs_dir2_sf_hdr          *sfp;
 622        struct xfs_dir2_sf_entry        *sfep;
 623        struct xfs_dir2_sf_entry        *next_sfep;
 624        char                            *endp;
 625        const struct xfs_dir_ops        *dops;
 626        struct xfs_ifork                *ifp;
 627        xfs_ino_t                       ino;
 628        int                             i;
 629        int                             i8count;
 630        int                             offset;
 631        int                             size;
 632        int                             error;
 633        uint8_t                         filetype;
 634
 635        ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_LOCAL);
 636        /*
 637         * xfs_iread calls us before xfs_setup_inode sets up ip->d_ops,
 638         * so we can only trust the mountpoint to have the right pointer.
 639         */
 640        dops = xfs_dir_get_ops(mp, NULL);
 641
 642        ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
 643        sfp = (struct xfs_dir2_sf_hdr *)ifp->if_u1.if_data;
 644        size = ifp->if_bytes;
 645
 646        /*
 647         * Give up if the directory is way too short.
 648         */
 649        if (size <= offsetof(struct xfs_dir2_sf_hdr, parent) ||
 650            size < xfs_dir2_sf_hdr_size(sfp->i8count))
 651                return __this_address;
 652
 653        endp = (char *)sfp + size;
 654
 655        /* Check .. entry */
 656        ino = dops->sf_get_parent_ino(sfp);
 657        i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 658        error = xfs_dir_ino_validate(mp, ino);
 659        if (error)
 660                return __this_address;
 661        offset = dops->data_first_offset;
 662
 663        /* Check all reported entries */
 664        sfep = xfs_dir2_sf_firstentry(sfp);
 665        for (i = 0; i < sfp->count; i++) {
 666                /*
 667                 * struct xfs_dir2_sf_entry has a variable length.
 668                 * Check the fixed-offset parts of the structure are
 669                 * within the data buffer.
 670                 */
 671                if (((char *)sfep + sizeof(*sfep)) >= endp)
 672                        return __this_address;
 673
 674                /* Don't allow names with known bad length. */
 675                if (sfep->namelen == 0)
 676                        return __this_address;
 677
 678                /*
 679                 * Check that the variable-length part of the structure is
 680                 * within the data buffer.  The next entry starts after the
 681                 * name component, so nextentry is an acceptable test.
 682                 */
 683                next_sfep = dops->sf_nextentry(sfp, sfep);
 684                if (endp < (char *)next_sfep)
 685                        return __this_address;
 686
 687                /* Check that the offsets always increase. */
 688                if (xfs_dir2_sf_get_offset(sfep) < offset)
 689                        return __this_address;
 690
 691                /* Check the inode number. */
 692                ino = dops->sf_get_ino(sfp, sfep);
 693                i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 694                error = xfs_dir_ino_validate(mp, ino);
 695                if (error)
 696                        return __this_address;
 697
 698                /* Check the file type. */
 699                filetype = dops->sf_get_ftype(sfep);
 700                if (filetype >= XFS_DIR3_FT_MAX)
 701                        return __this_address;
 702
 703                offset = xfs_dir2_sf_get_offset(sfep) +
 704                                dops->data_entsize(sfep->namelen);
 705
 706                sfep = next_sfep;
 707        }
 708        if (i8count != sfp->i8count)
 709                return __this_address;
 710        if ((void *)sfep != (void *)endp)
 711                return __this_address;
 712
 713        /* Make sure this whole thing ought to be in local format. */
 714        if (offset + (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 715            (uint)sizeof(xfs_dir2_block_tail_t) > mp->m_dir_geo->blksize)
 716                return __this_address;
 717
 718        return NULL;
 719}
 720
 721/*
 722 * Create a new (shortform) directory.
 723 */
 724int                                     /* error, always 0 */
 725xfs_dir2_sf_create(
 726        xfs_da_args_t   *args,          /* operation arguments */
 727        xfs_ino_t       pino)           /* parent inode number */
 728{
 729        xfs_inode_t     *dp;            /* incore directory inode */
 730        int             i8count;        /* parent inode is an 8-byte number */
 731        xfs_dir2_sf_hdr_t *sfp;         /* shortform structure */
 732        int             size;           /* directory size */
 733
 734        trace_xfs_dir2_sf_create(args);
 735
 736        dp = args->dp;
 737
 738        ASSERT(dp != NULL);
 739        ASSERT(dp->i_d.di_size == 0);
 740        /*
 741         * If it's currently a zero-length extent file,
 742         * convert it to local format.
 743         */
 744        if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
 745                dp->i_df.if_flags &= ~XFS_IFEXTENTS;    /* just in case */
 746                dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 747                xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
 748                dp->i_df.if_flags |= XFS_IFINLINE;
 749        }
 750        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 751        ASSERT(dp->i_df.if_bytes == 0);
 752        i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
 753        size = xfs_dir2_sf_hdr_size(i8count);
 754        /*
 755         * Make a buffer for the data.
 756         */
 757        xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 758        /*
 759         * Fill in the header,
 760         */
 761        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 762        sfp->i8count = i8count;
 763        /*
 764         * Now can put in the inode number, since i8count is set.
 765         */
 766        dp->d_ops->sf_put_parent_ino(sfp, pino);
 767        sfp->count = 0;
 768        dp->i_d.di_size = size;
 769        xfs_dir2_sf_check(args);
 770        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 771        return 0;
 772}
 773
 774/*
 775 * Lookup an entry in a shortform directory.
 776 * Returns EEXIST if found, ENOENT if not found.
 777 */
 778int                                             /* error */
 779xfs_dir2_sf_lookup(
 780        xfs_da_args_t           *args)          /* operation arguments */
 781{
 782        xfs_inode_t             *dp;            /* incore directory inode */
 783        int                     i;              /* entry index */
 784        int                     error;
 785        xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 786        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 787        enum xfs_dacmp          cmp;            /* comparison result */
 788        xfs_dir2_sf_entry_t     *ci_sfep;       /* case-insens. entry */
 789
 790        trace_xfs_dir2_sf_lookup(args);
 791
 792        xfs_dir2_sf_check(args);
 793        dp = args->dp;
 794
 795        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 796        /*
 797         * Bail out if the directory is way too short.
 798         */
 799        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 800                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 801                return -EIO;
 802        }
 803        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 804        ASSERT(dp->i_df.if_u1.if_data != NULL);
 805        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 806        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 807        /*
 808         * Special case for .
 809         */
 810        if (args->namelen == 1 && args->name[0] == '.') {
 811                args->inumber = dp->i_ino;
 812                args->cmpresult = XFS_CMP_EXACT;
 813                args->filetype = XFS_DIR3_FT_DIR;
 814                return -EEXIST;
 815        }
 816        /*
 817         * Special case for ..
 818         */
 819        if (args->namelen == 2 &&
 820            args->name[0] == '.' && args->name[1] == '.') {
 821                args->inumber = dp->d_ops->sf_get_parent_ino(sfp);
 822                args->cmpresult = XFS_CMP_EXACT;
 823                args->filetype = XFS_DIR3_FT_DIR;
 824                return -EEXIST;
 825        }
 826        /*
 827         * Loop over all the entries trying to match ours.
 828         */
 829        ci_sfep = NULL;
 830        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 831             i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 832                /*
 833                 * Compare name and if it's an exact match, return the inode
 834                 * number. If it's the first case-insensitive match, store the
 835                 * inode number and continue looking for an exact match.
 836                 */
 837                cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
 838                                                                sfep->namelen);
 839                if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
 840                        args->cmpresult = cmp;
 841                        args->inumber = dp->d_ops->sf_get_ino(sfp, sfep);
 842                        args->filetype = dp->d_ops->sf_get_ftype(sfep);
 843                        if (cmp == XFS_CMP_EXACT)
 844                                return -EEXIST;
 845                        ci_sfep = sfep;
 846                }
 847        }
 848        ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 849        /*
 850         * Here, we can only be doing a lookup (not a rename or replace).
 851         * If a case-insensitive match was not found, return -ENOENT.
 852         */
 853        if (!ci_sfep)
 854                return -ENOENT;
 855        /* otherwise process the CI match as required by the caller */
 856        error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
 857        return error;
 858}
 859
 860/*
 861 * Remove an entry from a shortform directory.
 862 */
 863int                                             /* error */
 864xfs_dir2_sf_removename(
 865        xfs_da_args_t           *args)
 866{
 867        int                     byteoff;        /* offset of removed entry */
 868        xfs_inode_t             *dp;            /* incore directory inode */
 869        int                     entsize;        /* this entry's size */
 870        int                     i;              /* shortform entry index */
 871        int                     newsize;        /* new inode size */
 872        int                     oldsize;        /* old inode size */
 873        xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 874        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 875
 876        trace_xfs_dir2_sf_removename(args);
 877
 878        dp = args->dp;
 879
 880        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 881        oldsize = (int)dp->i_d.di_size;
 882        /*
 883         * Bail out if the directory is way too short.
 884         */
 885        if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 886                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 887                return -EIO;
 888        }
 889        ASSERT(dp->i_df.if_bytes == oldsize);
 890        ASSERT(dp->i_df.if_u1.if_data != NULL);
 891        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 892        ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
 893        /*
 894         * Loop over the old directory entries.
 895         * Find the one we're deleting.
 896         */
 897        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 898             i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 899                if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
 900                                                                XFS_CMP_EXACT) {
 901                        ASSERT(dp->d_ops->sf_get_ino(sfp, sfep) ==
 902                               args->inumber);
 903                        break;
 904                }
 905        }
 906        /*
 907         * Didn't find it.
 908         */
 909        if (i == sfp->count)
 910                return -ENOENT;
 911        /*
 912         * Calculate sizes.
 913         */
 914        byteoff = (int)((char *)sfep - (char *)sfp);
 915        entsize = dp->d_ops->sf_entsize(sfp, args->namelen);
 916        newsize = oldsize - entsize;
 917        /*
 918         * Copy the part if any after the removed entry, sliding it down.
 919         */
 920        if (byteoff + entsize < oldsize)
 921                memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
 922                        oldsize - (byteoff + entsize));
 923        /*
 924         * Fix up the header and file size.
 925         */
 926        sfp->count--;
 927        dp->i_d.di_size = newsize;
 928        /*
 929         * Reallocate, making it smaller.
 930         */
 931        xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
 932        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 933        /*
 934         * Are we changing inode number size?
 935         */
 936        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
 937                if (sfp->i8count == 1)
 938                        xfs_dir2_sf_toino4(args);
 939                else
 940                        sfp->i8count--;
 941        }
 942        xfs_dir2_sf_check(args);
 943        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 944        return 0;
 945}
 946
 947/*
 948 * Replace the inode number of an entry in a shortform directory.
 949 */
 950int                                             /* error */
 951xfs_dir2_sf_replace(
 952        xfs_da_args_t           *args)          /* operation arguments */
 953{
 954        xfs_inode_t             *dp;            /* incore directory inode */
 955        int                     i;              /* entry index */
 956        xfs_ino_t               ino=0;          /* entry old inode number */
 957        int                     i8elevated;     /* sf_toino8 set i8count=1 */
 958        xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 959        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 960
 961        trace_xfs_dir2_sf_replace(args);
 962
 963        dp = args->dp;
 964
 965        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 966        /*
 967         * Bail out if the shortform directory is way too small.
 968         */
 969        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 970                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 971                return -EIO;
 972        }
 973        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 974        ASSERT(dp->i_df.if_u1.if_data != NULL);
 975        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 976        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 977
 978        /*
 979         * New inode number is large, and need to convert to 8-byte inodes.
 980         */
 981        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
 982                int     error;                  /* error return value */
 983                int     newsize;                /* new inode size */
 984
 985                newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
 986                /*
 987                 * Won't fit as shortform, convert to block then do replace.
 988                 */
 989                if (newsize > XFS_IFORK_DSIZE(dp)) {
 990                        error = xfs_dir2_sf_to_block(args);
 991                        if (error) {
 992                                return error;
 993                        }
 994                        return xfs_dir2_block_replace(args);
 995                }
 996                /*
 997                 * Still fits, convert to 8-byte now.
 998                 */
 999                xfs_dir2_sf_toino8(args);
1000                i8elevated = 1;
1001                sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1002        } else
1003                i8elevated = 0;
1004
1005        ASSERT(args->namelen != 1 || args->name[0] != '.');
1006        /*
1007         * Replace ..'s entry.
1008         */
1009        if (args->namelen == 2 &&
1010            args->name[0] == '.' && args->name[1] == '.') {
1011                ino = dp->d_ops->sf_get_parent_ino(sfp);
1012                ASSERT(args->inumber != ino);
1013                dp->d_ops->sf_put_parent_ino(sfp, args->inumber);
1014        }
1015        /*
1016         * Normal entry, look for the name.
1017         */
1018        else {
1019                for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
1020                     i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
1021                        if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1022                                                                XFS_CMP_EXACT) {
1023                                ino = dp->d_ops->sf_get_ino(sfp, sfep);
1024                                ASSERT(args->inumber != ino);
1025                                dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
1026                                dp->d_ops->sf_put_ftype(sfep, args->filetype);
1027                                break;
1028                        }
1029                }
1030                /*
1031                 * Didn't find it.
1032                 */
1033                if (i == sfp->count) {
1034                        ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1035                        if (i8elevated)
1036                                xfs_dir2_sf_toino4(args);
1037                        return -ENOENT;
1038                }
1039        }
1040        /*
1041         * See if the old number was large, the new number is small.
1042         */
1043        if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1044            args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1045                /*
1046                 * And the old count was one, so need to convert to small.
1047                 */
1048                if (sfp->i8count == 1)
1049                        xfs_dir2_sf_toino4(args);
1050                else
1051                        sfp->i8count--;
1052        }
1053        /*
1054         * See if the old number was small, the new number is large.
1055         */
1056        if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1057            args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1058                /*
1059                 * add to the i8count unless we just converted to 8-byte
1060                 * inodes (which does an implied i8count = 1)
1061                 */
1062                ASSERT(sfp->i8count != 0);
1063                if (!i8elevated)
1064                        sfp->i8count++;
1065        }
1066        xfs_dir2_sf_check(args);
1067        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1068        return 0;
1069}
1070
1071/*
1072 * Convert from 8-byte inode numbers to 4-byte inode numbers.
1073 * The last 8-byte inode number is gone, but the count is still 1.
1074 */
1075static void
1076xfs_dir2_sf_toino4(
1077        xfs_da_args_t           *args)          /* operation arguments */
1078{
1079        char                    *buf;           /* old dir's buffer */
1080        xfs_inode_t             *dp;            /* incore directory inode */
1081        int                     i;              /* entry index */
1082        int                     newsize;        /* new inode size */
1083        xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1084        xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
1085        int                     oldsize;        /* old inode size */
1086        xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1087        xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
1088
1089        trace_xfs_dir2_sf_toino4(args);
1090
1091        dp = args->dp;
1092
1093        /*
1094         * Copy the old directory to the buffer.
1095         * Then nuke it from the inode, and add the new buffer to the inode.
1096         * Don't want xfs_idata_realloc copying the data here.
1097         */
1098        oldsize = dp->i_df.if_bytes;
1099        buf = kmem_alloc(oldsize, 0);
1100        oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1101        ASSERT(oldsfp->i8count == 1);
1102        memcpy(buf, oldsfp, oldsize);
1103        /*
1104         * Compute the new inode size.
1105         */
1106        newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
1107        xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1108        xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1109        /*
1110         * Reset our pointers, the data has moved.
1111         */
1112        oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1113        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1114        /*
1115         * Fill in the new header.
1116         */
1117        sfp->count = oldsfp->count;
1118        sfp->i8count = 0;
1119        dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1120        /*
1121         * Copy the entries field by field.
1122         */
1123        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1124                    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1125             i < sfp->count;
1126             i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1127                  oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1128                sfep->namelen = oldsfep->namelen;
1129                memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1130                memcpy(sfep->name, oldsfep->name, sfep->namelen);
1131                dp->d_ops->sf_put_ino(sfp, sfep,
1132                                      dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1133                dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1134        }
1135        /*
1136         * Clean up the inode.
1137         */
1138        kmem_free(buf);
1139        dp->i_d.di_size = newsize;
1140        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1141}
1142
1143/*
1144 * Convert existing entries from 4-byte inode numbers to 8-byte inode numbers.
1145 * The new entry w/ an 8-byte inode number is not there yet; we leave with
1146 * i8count set to 1, but no corresponding 8-byte entry.
1147 */
1148static void
1149xfs_dir2_sf_toino8(
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        int                     newsize;        /* new inode size */
1156        xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1157        xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
1158        int                     oldsize;        /* old inode size */
1159        xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1160        xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
1161
1162        trace_xfs_dir2_sf_toino8(args);
1163
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, 0);
1173        oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1174        ASSERT(oldsfp->i8count == 0);
1175        memcpy(buf, oldsfp, oldsize);
1176        /*
1177         * Compute the new inode size (nb: entry count + 1 for parent)
1178         */
1179        newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
1180        xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1181        xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1182        /*
1183         * Reset our pointers, the data has moved.
1184         */
1185        oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1186        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1187        /*
1188         * Fill in the new header.
1189         */
1190        sfp->count = oldsfp->count;
1191        sfp->i8count = 1;
1192        dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1193        /*
1194         * Copy the entries field by field.
1195         */
1196        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1197                    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1198             i < sfp->count;
1199             i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1200                  oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1201                sfep->namelen = oldsfep->namelen;
1202                memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1203                memcpy(sfep->name, oldsfep->name, sfep->namelen);
1204                dp->d_ops->sf_put_ino(sfp, sfep,
1205                                      dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1206                dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1207        }
1208        /*
1209         * Clean up the inode.
1210         */
1211        kmem_free(buf);
1212        dp->i_d.di_size = newsize;
1213        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1214}
1215