linux/fs/xfs/xfs_dir2_sf.c
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   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_trans.h"
  23#include "xfs_sb.h"
  24#include "xfs_ag.h"
  25#include "xfs_mount.h"
  26#include "xfs_da_btree.h"
  27#include "xfs_bmap_btree.h"
  28#include "xfs_dinode.h"
  29#include "xfs_inode.h"
  30#include "xfs_inode_item.h"
  31#include "xfs_error.h"
  32#include "xfs_dir2.h"
  33#include "xfs_dir2_format.h"
  34#include "xfs_dir2_priv.h"
  35#include "xfs_trace.h"
  36
  37/*
  38 * Prototypes for internal functions.
  39 */
  40static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
  41                                     xfs_dir2_sf_entry_t *sfep,
  42                                     xfs_dir2_data_aoff_t offset,
  43                                     int new_isize);
  44static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
  45                                     int new_isize);
  46static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
  47                                    xfs_dir2_sf_entry_t **sfepp,
  48                                    xfs_dir2_data_aoff_t *offsetp);
  49#ifdef DEBUG
  50static void xfs_dir2_sf_check(xfs_da_args_t *args);
  51#else
  52#define xfs_dir2_sf_check(args)
  53#endif /* DEBUG */
  54#if XFS_BIG_INUMS
  55static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
  56static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
  57#endif /* XFS_BIG_INUMS */
  58
  59/*
  60 * Inode numbers in short-form directories can come in two versions,
  61 * either 4 bytes or 8 bytes wide.  These helpers deal with the
  62 * two forms transparently by looking at the headers i8count field.
  63 *
  64 * For 64-bit inode number the most significant byte must be zero.
  65 */
  66static xfs_ino_t
  67xfs_dir2_sf_get_ino(
  68        struct xfs_dir2_sf_hdr  *hdr,
  69        xfs_dir2_inou_t         *from)
  70{
  71        if (hdr->i8count)
  72                return get_unaligned_be64(&from->i8.i) & 0x00ffffffffffffffULL;
  73        else
  74                return get_unaligned_be32(&from->i4.i);
  75}
  76
  77static void
  78xfs_dir2_sf_put_ino(
  79        struct xfs_dir2_sf_hdr  *hdr,
  80        xfs_dir2_inou_t         *to,
  81        xfs_ino_t               ino)
  82{
  83        ASSERT((ino & 0xff00000000000000ULL) == 0);
  84
  85        if (hdr->i8count)
  86                put_unaligned_be64(ino, &to->i8.i);
  87        else
  88                put_unaligned_be32(ino, &to->i4.i);
  89}
  90
  91xfs_ino_t
  92xfs_dir2_sf_get_parent_ino(
  93        struct xfs_dir2_sf_hdr  *hdr)
  94{
  95        return xfs_dir2_sf_get_ino(hdr, &hdr->parent);
  96}
  97
  98static void
  99xfs_dir2_sf_put_parent_ino(
 100        struct xfs_dir2_sf_hdr  *hdr,
 101        xfs_ino_t               ino)
 102{
 103        xfs_dir2_sf_put_ino(hdr, &hdr->parent, ino);
 104}
 105
 106/*
 107 * In short-form directory entries the inode numbers are stored at variable
 108 * offset behind the entry name.  The inode numbers may only be accessed
 109 * through the helpers below.
 110 */
 111static xfs_dir2_inou_t *
 112xfs_dir2_sfe_inop(
 113        struct xfs_dir2_sf_entry *sfep)
 114{
 115        return (xfs_dir2_inou_t *)&sfep->name[sfep->namelen];
 116}
 117
 118xfs_ino_t
 119xfs_dir2_sfe_get_ino(
 120        struct xfs_dir2_sf_hdr  *hdr,
 121        struct xfs_dir2_sf_entry *sfep)
 122{
 123        return xfs_dir2_sf_get_ino(hdr, xfs_dir2_sfe_inop(sfep));
 124}
 125
 126static void
 127xfs_dir2_sfe_put_ino(
 128        struct xfs_dir2_sf_hdr  *hdr,
 129        struct xfs_dir2_sf_entry *sfep,
 130        xfs_ino_t               ino)
 131{
 132        xfs_dir2_sf_put_ino(hdr, xfs_dir2_sfe_inop(sfep), ino);
 133}
 134
 135/*
 136 * Given a block directory (dp/block), calculate its size as a shortform (sf)
 137 * directory and a header for the sf directory, if it will fit it the
 138 * space currently present in the inode.  If it won't fit, the output
 139 * size is too big (but not accurate).
 140 */
 141int                                             /* size for sf form */
 142xfs_dir2_block_sfsize(
 143        xfs_inode_t             *dp,            /* incore inode pointer */
 144        xfs_dir2_data_hdr_t     *hdr,           /* block directory data */
 145        xfs_dir2_sf_hdr_t       *sfhp)          /* output: header for sf form */
 146{
 147        xfs_dir2_dataptr_t      addr;           /* data entry address */
 148        xfs_dir2_leaf_entry_t   *blp;           /* leaf area of the block */
 149        xfs_dir2_block_tail_t   *btp;           /* tail area of the block */
 150        int                     count;          /* shortform entry count */
 151        xfs_dir2_data_entry_t   *dep;           /* data entry in the block */
 152        int                     i;              /* block entry index */
 153        int                     i8count;        /* count of big-inode entries */
 154        int                     isdot;          /* entry is "." */
 155        int                     isdotdot;       /* entry is ".." */
 156        xfs_mount_t             *mp;            /* mount structure pointer */
 157        int                     namelen;        /* total name bytes */
 158        xfs_ino_t               parent = 0;     /* parent inode number */
 159        int                     size=0;         /* total computed size */
 160
 161        mp = dp->i_mount;
 162
 163        count = i8count = namelen = 0;
 164        btp = xfs_dir2_block_tail_p(mp, hdr);
 165        blp = xfs_dir2_block_leaf_p(btp);
 166
 167        /*
 168         * Iterate over the block's data entries by using the leaf pointers.
 169         */
 170        for (i = 0; i < be32_to_cpu(btp->count); i++) {
 171                if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
 172                        continue;
 173                /*
 174                 * Calculate the pointer to the entry at hand.
 175                 */
 176                dep = (xfs_dir2_data_entry_t *)
 177                      ((char *)hdr + xfs_dir2_dataptr_to_off(mp, addr));
 178                /*
 179                 * Detect . and .., so we can special-case them.
 180                 * . is not included in sf directories.
 181                 * .. is included by just the parent inode number.
 182                 */
 183                isdot = dep->namelen == 1 && dep->name[0] == '.';
 184                isdotdot =
 185                        dep->namelen == 2 &&
 186                        dep->name[0] == '.' && dep->name[1] == '.';
 187#if XFS_BIG_INUMS
 188                if (!isdot)
 189                        i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
 190#endif
 191                if (!isdot && !isdotdot) {
 192                        count++;
 193                        namelen += dep->namelen;
 194                } else if (isdotdot)
 195                        parent = be64_to_cpu(dep->inumber);
 196                /*
 197                 * Calculate the new size, see if we should give up yet.
 198                 */
 199                size = xfs_dir2_sf_hdr_size(i8count) +          /* header */
 200                       count +                                  /* namelen */
 201                       count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
 202                       namelen +                                /* name */
 203                       (i8count ?                               /* inumber */
 204                                (uint)sizeof(xfs_dir2_ino8_t) * count :
 205                                (uint)sizeof(xfs_dir2_ino4_t) * count);
 206                if (size > XFS_IFORK_DSIZE(dp))
 207                        return size;            /* size value is a failure */
 208        }
 209        /*
 210         * Create the output header, if it worked.
 211         */
 212        sfhp->count = count;
 213        sfhp->i8count = i8count;
 214        xfs_dir2_sf_put_parent_ino(sfhp, parent);
 215        return size;
 216}
 217
 218/*
 219 * Convert a block format directory to shortform.
 220 * Caller has already checked that it will fit, and built us a header.
 221 */
 222int                                             /* error */
 223xfs_dir2_block_to_sf(
 224        xfs_da_args_t           *args,          /* operation arguments */
 225        struct xfs_buf          *bp,
 226        int                     size,           /* shortform directory size */
 227        xfs_dir2_sf_hdr_t       *sfhp)          /* shortform directory hdr */
 228{
 229        xfs_dir2_data_hdr_t     *hdr;           /* block header */
 230        xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
 231        xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
 232        xfs_inode_t             *dp;            /* incore directory inode */
 233        xfs_dir2_data_unused_t  *dup;           /* unused data pointer */
 234        char                    *endptr;        /* end of data entries */
 235        int                     error;          /* error return value */
 236        int                     logflags;       /* inode logging flags */
 237        xfs_mount_t             *mp;            /* filesystem mount point */
 238        char                    *ptr;           /* current data pointer */
 239        xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 240        xfs_dir2_sf_hdr_t       *sfp;           /* shortform directory header */
 241
 242        trace_xfs_dir2_block_to_sf(args);
 243
 244        dp = args->dp;
 245        mp = dp->i_mount;
 246
 247        /*
 248         * Make a copy of the block data, so we can shrink the inode
 249         * and add local data.
 250         */
 251        hdr = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
 252        memcpy(hdr, bp->b_addr, mp->m_dirblksize);
 253        logflags = XFS_ILOG_CORE;
 254        if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
 255                ASSERT(error != ENOSPC);
 256                goto out;
 257        }
 258
 259        /*
 260         * The buffer is now unconditionally gone, whether
 261         * xfs_dir2_shrink_inode worked or not.
 262         *
 263         * Convert the inode to local format.
 264         */
 265        dp->i_df.if_flags &= ~XFS_IFEXTENTS;
 266        dp->i_df.if_flags |= XFS_IFINLINE;
 267        dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 268        ASSERT(dp->i_df.if_bytes == 0);
 269        xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 270        logflags |= XFS_ILOG_DDATA;
 271        /*
 272         * Copy the header into the newly allocate local space.
 273         */
 274        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 275        memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
 276        dp->i_d.di_size = size;
 277        /*
 278         * Set up to loop over the block's entries.
 279         */
 280        btp = xfs_dir2_block_tail_p(mp, hdr);
 281        ptr = (char *)(hdr + 1);
 282        endptr = (char *)xfs_dir2_block_leaf_p(btp);
 283        sfep = xfs_dir2_sf_firstentry(sfp);
 284        /*
 285         * Loop over the active and unused entries.
 286         * Stop when we reach the leaf/tail portion of the block.
 287         */
 288        while (ptr < endptr) {
 289                /*
 290                 * If it's unused, just skip over it.
 291                 */
 292                dup = (xfs_dir2_data_unused_t *)ptr;
 293                if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 294                        ptr += be16_to_cpu(dup->length);
 295                        continue;
 296                }
 297                dep = (xfs_dir2_data_entry_t *)ptr;
 298                /*
 299                 * Skip .
 300                 */
 301                if (dep->namelen == 1 && dep->name[0] == '.')
 302                        ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
 303                /*
 304                 * Skip .., but make sure the inode number is right.
 305                 */
 306                else if (dep->namelen == 2 &&
 307                         dep->name[0] == '.' && dep->name[1] == '.')
 308                        ASSERT(be64_to_cpu(dep->inumber) ==
 309                               xfs_dir2_sf_get_parent_ino(sfp));
 310                /*
 311                 * Normal entry, copy it into shortform.
 312                 */
 313                else {
 314                        sfep->namelen = dep->namelen;
 315                        xfs_dir2_sf_put_offset(sfep,
 316                                (xfs_dir2_data_aoff_t)
 317                                ((char *)dep - (char *)hdr));
 318                        memcpy(sfep->name, dep->name, dep->namelen);
 319                        xfs_dir2_sfe_put_ino(sfp, sfep,
 320                                             be64_to_cpu(dep->inumber));
 321
 322                        sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 323                }
 324                ptr += xfs_dir2_data_entsize(dep->namelen);
 325        }
 326        ASSERT((char *)sfep - (char *)sfp == size);
 327        xfs_dir2_sf_check(args);
 328out:
 329        xfs_trans_log_inode(args->trans, dp, logflags);
 330        kmem_free(hdr);
 331        return error;
 332}
 333
 334/*
 335 * Add a name to a shortform directory.
 336 * There are two algorithms, "easy" and "hard" which we decide on
 337 * before changing anything.
 338 * Convert to block form if necessary, if the new entry won't fit.
 339 */
 340int                                             /* error */
 341xfs_dir2_sf_addname(
 342        xfs_da_args_t           *args)          /* operation arguments */
 343{
 344        int                     add_entsize;    /* size of the new entry */
 345        xfs_inode_t             *dp;            /* incore directory inode */
 346        int                     error;          /* error return value */
 347        int                     incr_isize;     /* total change in size */
 348        int                     new_isize;      /* di_size after adding name */
 349        int                     objchange;      /* changing to 8-byte inodes */
 350        xfs_dir2_data_aoff_t    offset = 0;     /* offset for new entry */
 351        int                     old_isize;      /* di_size before adding name */
 352        int                     pick;           /* which algorithm to use */
 353        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 354        xfs_dir2_sf_entry_t     *sfep = NULL;   /* shortform entry */
 355
 356        trace_xfs_dir2_sf_addname(args);
 357
 358        ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
 359        dp = args->dp;
 360        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 361        /*
 362         * Make sure the shortform value has some of its header.
 363         */
 364        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 365                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 366                return XFS_ERROR(EIO);
 367        }
 368        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 369        ASSERT(dp->i_df.if_u1.if_data != NULL);
 370        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 371        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 372        /*
 373         * Compute entry (and change in) size.
 374         */
 375        add_entsize = xfs_dir2_sf_entsize(sfp, args->namelen);
 376        incr_isize = add_entsize;
 377        objchange = 0;
 378#if XFS_BIG_INUMS
 379        /*
 380         * Do we have to change to 8 byte inodes?
 381         */
 382        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
 383                /*
 384                 * Yes, adjust the entry size and the total size.
 385                 */
 386                add_entsize +=
 387                        (uint)sizeof(xfs_dir2_ino8_t) -
 388                        (uint)sizeof(xfs_dir2_ino4_t);
 389                incr_isize +=
 390                        (sfp->count + 2) *
 391                        ((uint)sizeof(xfs_dir2_ino8_t) -
 392                         (uint)sizeof(xfs_dir2_ino4_t));
 393                objchange = 1;
 394        }
 395#endif
 396        old_isize = (int)dp->i_d.di_size;
 397        new_isize = old_isize + incr_isize;
 398        /*
 399         * Won't fit as shortform any more (due to size),
 400         * or the pick routine says it won't (due to offset values).
 401         */
 402        if (new_isize > XFS_IFORK_DSIZE(dp) ||
 403            (pick =
 404             xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
 405                /*
 406                 * Just checking or no space reservation, it doesn't fit.
 407                 */
 408                if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
 409                        return XFS_ERROR(ENOSPC);
 410                /*
 411                 * Convert to block form then add the name.
 412                 */
 413                error = xfs_dir2_sf_to_block(args);
 414                if (error)
 415                        return error;
 416                return xfs_dir2_block_addname(args);
 417        }
 418        /*
 419         * Just checking, it fits.
 420         */
 421        if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 422                return 0;
 423        /*
 424         * Do it the easy way - just add it at the end.
 425         */
 426        if (pick == 1)
 427                xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
 428        /*
 429         * Do it the hard way - look for a place to insert the new entry.
 430         * Convert to 8 byte inode numbers first if necessary.
 431         */
 432        else {
 433                ASSERT(pick == 2);
 434#if XFS_BIG_INUMS
 435                if (objchange)
 436                        xfs_dir2_sf_toino8(args);
 437#endif
 438                xfs_dir2_sf_addname_hard(args, objchange, new_isize);
 439        }
 440        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 441        return 0;
 442}
 443
 444/*
 445 * Add the new entry the "easy" way.
 446 * This is copying the old directory and adding the new entry at the end.
 447 * Since it's sorted by "offset" we need room after the last offset
 448 * that's already there, and then room to convert to a block directory.
 449 * This is already checked by the pick routine.
 450 */
 451static void
 452xfs_dir2_sf_addname_easy(
 453        xfs_da_args_t           *args,          /* operation arguments */
 454        xfs_dir2_sf_entry_t     *sfep,          /* pointer to new entry */
 455        xfs_dir2_data_aoff_t    offset,         /* offset to use for new ent */
 456        int                     new_isize)      /* new directory size */
 457{
 458        int                     byteoff;        /* byte offset in sf dir */
 459        xfs_inode_t             *dp;            /* incore directory inode */
 460        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 461
 462        dp = args->dp;
 463
 464        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 465        byteoff = (int)((char *)sfep - (char *)sfp);
 466        /*
 467         * Grow the in-inode space.
 468         */
 469        xfs_idata_realloc(dp, xfs_dir2_sf_entsize(sfp, args->namelen),
 470                XFS_DATA_FORK);
 471        /*
 472         * Need to set up again due to realloc of the inode data.
 473         */
 474        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 475        sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
 476        /*
 477         * Fill in the new entry.
 478         */
 479        sfep->namelen = args->namelen;
 480        xfs_dir2_sf_put_offset(sfep, offset);
 481        memcpy(sfep->name, args->name, sfep->namelen);
 482        xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
 483        /*
 484         * Update the header and inode.
 485         */
 486        sfp->count++;
 487#if XFS_BIG_INUMS
 488        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
 489                sfp->i8count++;
 490#endif
 491        dp->i_d.di_size = new_isize;
 492        xfs_dir2_sf_check(args);
 493}
 494
 495/*
 496 * Add the new entry the "hard" way.
 497 * The caller has already converted to 8 byte inode numbers if necessary,
 498 * in which case we need to leave the i8count at 1.
 499 * Find a hole that the new entry will fit into, and copy
 500 * the first part of the entries, the new entry, and the last part of
 501 * the entries.
 502 */
 503/* ARGSUSED */
 504static void
 505xfs_dir2_sf_addname_hard(
 506        xfs_da_args_t           *args,          /* operation arguments */
 507        int                     objchange,      /* changing inode number size */
 508        int                     new_isize)      /* new directory size */
 509{
 510        int                     add_datasize;   /* data size need for new ent */
 511        char                    *buf;           /* buffer for old */
 512        xfs_inode_t             *dp;            /* incore directory inode */
 513        int                     eof;            /* reached end of old dir */
 514        int                     nbytes;         /* temp for byte copies */
 515        xfs_dir2_data_aoff_t    new_offset;     /* next offset value */
 516        xfs_dir2_data_aoff_t    offset;         /* current offset value */
 517        int                     old_isize;      /* previous di_size */
 518        xfs_dir2_sf_entry_t     *oldsfep;       /* entry in original dir */
 519        xfs_dir2_sf_hdr_t       *oldsfp;        /* original shortform dir */
 520        xfs_dir2_sf_entry_t     *sfep;          /* entry in new dir */
 521        xfs_dir2_sf_hdr_t       *sfp;           /* new shortform dir */
 522
 523        /*
 524         * Copy the old directory to the stack buffer.
 525         */
 526        dp = args->dp;
 527
 528        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 529        old_isize = (int)dp->i_d.di_size;
 530        buf = kmem_alloc(old_isize, KM_SLEEP);
 531        oldsfp = (xfs_dir2_sf_hdr_t *)buf;
 532        memcpy(oldsfp, sfp, old_isize);
 533        /*
 534         * Loop over the old directory finding the place we're going
 535         * to insert the new entry.
 536         * If it's going to end up at the end then oldsfep will point there.
 537         */
 538        for (offset = XFS_DIR2_DATA_FIRST_OFFSET,
 539              oldsfep = xfs_dir2_sf_firstentry(oldsfp),
 540              add_datasize = xfs_dir2_data_entsize(args->namelen),
 541              eof = (char *)oldsfep == &buf[old_isize];
 542             !eof;
 543             offset = new_offset + xfs_dir2_data_entsize(oldsfep->namelen),
 544              oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep),
 545              eof = (char *)oldsfep == &buf[old_isize]) {
 546                new_offset = xfs_dir2_sf_get_offset(oldsfep);
 547                if (offset + add_datasize <= new_offset)
 548                        break;
 549        }
 550        /*
 551         * Get rid of the old directory, then allocate space for
 552         * the new one.  We do this so xfs_idata_realloc won't copy
 553         * the data.
 554         */
 555        xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
 556        xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
 557        /*
 558         * Reset the pointer since the buffer was reallocated.
 559         */
 560        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 561        /*
 562         * Copy the first part of the directory, including the header.
 563         */
 564        nbytes = (int)((char *)oldsfep - (char *)oldsfp);
 565        memcpy(sfp, oldsfp, nbytes);
 566        sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
 567        /*
 568         * Fill in the new entry, and update the header counts.
 569         */
 570        sfep->namelen = args->namelen;
 571        xfs_dir2_sf_put_offset(sfep, offset);
 572        memcpy(sfep->name, args->name, sfep->namelen);
 573        xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
 574        sfp->count++;
 575#if XFS_BIG_INUMS
 576        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
 577                sfp->i8count++;
 578#endif
 579        /*
 580         * If there's more left to copy, do that.
 581         */
 582        if (!eof) {
 583                sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 584                memcpy(sfep, oldsfep, old_isize - nbytes);
 585        }
 586        kmem_free(buf);
 587        dp->i_d.di_size = new_isize;
 588        xfs_dir2_sf_check(args);
 589}
 590
 591/*
 592 * Decide if the new entry will fit at all.
 593 * If it will fit, pick between adding the new entry to the end (easy)
 594 * or somewhere else (hard).
 595 * Return 0 (won't fit), 1 (easy), 2 (hard).
 596 */
 597/*ARGSUSED*/
 598static int                                      /* pick result */
 599xfs_dir2_sf_addname_pick(
 600        xfs_da_args_t           *args,          /* operation arguments */
 601        int                     objchange,      /* inode # size changes */
 602        xfs_dir2_sf_entry_t     **sfepp,        /* out(1): new entry ptr */
 603        xfs_dir2_data_aoff_t    *offsetp)       /* out(1): new offset */
 604{
 605        xfs_inode_t             *dp;            /* incore directory inode */
 606        int                     holefit;        /* found hole it will fit in */
 607        int                     i;              /* entry number */
 608        xfs_mount_t             *mp;            /* filesystem mount point */
 609        xfs_dir2_data_aoff_t    offset;         /* data block offset */
 610        xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 611        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 612        int                     size;           /* entry's data size */
 613        int                     used;           /* data bytes used */
 614
 615        dp = args->dp;
 616        mp = dp->i_mount;
 617
 618        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 619        size = xfs_dir2_data_entsize(args->namelen);
 620        offset = XFS_DIR2_DATA_FIRST_OFFSET;
 621        sfep = xfs_dir2_sf_firstentry(sfp);
 622        holefit = 0;
 623        /*
 624         * Loop over sf entries.
 625         * Keep track of data offset and whether we've seen a place
 626         * to insert the new entry.
 627         */
 628        for (i = 0; i < sfp->count; i++) {
 629                if (!holefit)
 630                        holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
 631                offset = xfs_dir2_sf_get_offset(sfep) +
 632                         xfs_dir2_data_entsize(sfep->namelen);
 633                sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 634        }
 635        /*
 636         * Calculate data bytes used excluding the new entry, if this
 637         * was a data block (block form directory).
 638         */
 639        used = offset +
 640               (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 641               (uint)sizeof(xfs_dir2_block_tail_t);
 642        /*
 643         * If it won't fit in a block form then we can't insert it,
 644         * we'll go back, convert to block, then try the insert and convert
 645         * to leaf.
 646         */
 647        if (used + (holefit ? 0 : size) > mp->m_dirblksize)
 648                return 0;
 649        /*
 650         * If changing the inode number size, do it the hard way.
 651         */
 652#if XFS_BIG_INUMS
 653        if (objchange) {
 654                return 2;
 655        }
 656#else
 657        ASSERT(objchange == 0);
 658#endif
 659        /*
 660         * If it won't fit at the end then do it the hard way (use the hole).
 661         */
 662        if (used + size > mp->m_dirblksize)
 663                return 2;
 664        /*
 665         * Do it the easy way.
 666         */
 667        *sfepp = sfep;
 668        *offsetp = offset;
 669        return 1;
 670}
 671
 672#ifdef DEBUG
 673/*
 674 * Check consistency of shortform directory, assert if bad.
 675 */
 676static void
 677xfs_dir2_sf_check(
 678        xfs_da_args_t           *args)          /* operation arguments */
 679{
 680        xfs_inode_t             *dp;            /* incore directory inode */
 681        int                     i;              /* entry number */
 682        int                     i8count;        /* number of big inode#s */
 683        xfs_ino_t               ino;            /* entry inode number */
 684        int                     offset;         /* data offset */
 685        xfs_dir2_sf_entry_t     *sfep;          /* shortform dir entry */
 686        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 687
 688        dp = args->dp;
 689
 690        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 691        offset = XFS_DIR2_DATA_FIRST_OFFSET;
 692        ino = xfs_dir2_sf_get_parent_ino(sfp);
 693        i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 694
 695        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
 696             i < sfp->count;
 697             i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
 698                ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
 699                ino = xfs_dir2_sfe_get_ino(sfp, sfep);
 700                i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 701                offset =
 702                        xfs_dir2_sf_get_offset(sfep) +
 703                        xfs_dir2_data_entsize(sfep->namelen);
 704        }
 705        ASSERT(i8count == sfp->i8count);
 706        ASSERT(XFS_BIG_INUMS || i8count == 0);
 707        ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
 708        ASSERT(offset +
 709               (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 710               (uint)sizeof(xfs_dir2_block_tail_t) <=
 711               dp->i_mount->m_dirblksize);
 712}
 713#endif  /* DEBUG */
 714
 715/*
 716 * Create a new (shortform) directory.
 717 */
 718int                                     /* error, always 0 */
 719xfs_dir2_sf_create(
 720        xfs_da_args_t   *args,          /* operation arguments */
 721        xfs_ino_t       pino)           /* parent inode number */
 722{
 723        xfs_inode_t     *dp;            /* incore directory inode */
 724        int             i8count;        /* parent inode is an 8-byte number */
 725        xfs_dir2_sf_hdr_t *sfp;         /* shortform structure */
 726        int             size;           /* directory size */
 727
 728        trace_xfs_dir2_sf_create(args);
 729
 730        dp = args->dp;
 731
 732        ASSERT(dp != NULL);
 733        ASSERT(dp->i_d.di_size == 0);
 734        /*
 735         * If it's currently a zero-length extent file,
 736         * convert it to local format.
 737         */
 738        if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
 739                dp->i_df.if_flags &= ~XFS_IFEXTENTS;    /* just in case */
 740                dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 741                xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
 742                dp->i_df.if_flags |= XFS_IFINLINE;
 743        }
 744        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 745        ASSERT(dp->i_df.if_bytes == 0);
 746        i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
 747        size = xfs_dir2_sf_hdr_size(i8count);
 748        /*
 749         * Make a buffer for the data.
 750         */
 751        xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 752        /*
 753         * Fill in the header,
 754         */
 755        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 756        sfp->i8count = i8count;
 757        /*
 758         * Now can put in the inode number, since i8count is set.
 759         */
 760        xfs_dir2_sf_put_parent_ino(sfp, pino);
 761        sfp->count = 0;
 762        dp->i_d.di_size = size;
 763        xfs_dir2_sf_check(args);
 764        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 765        return 0;
 766}
 767
 768int                                             /* error */
 769xfs_dir2_sf_getdents(
 770        xfs_inode_t             *dp,            /* incore directory inode */
 771        void                    *dirent,
 772        xfs_off_t               *offset,
 773        filldir_t               filldir)
 774{
 775        int                     i;              /* shortform entry number */
 776        xfs_mount_t             *mp;            /* filesystem mount point */
 777        xfs_dir2_dataptr_t      off;            /* current entry's offset */
 778        xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 779        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 780        xfs_dir2_dataptr_t      dot_offset;
 781        xfs_dir2_dataptr_t      dotdot_offset;
 782        xfs_ino_t               ino;
 783
 784        mp = dp->i_mount;
 785
 786        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 787        /*
 788         * Give up if the directory is way too short.
 789         */
 790        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 791                ASSERT(XFS_FORCED_SHUTDOWN(mp));
 792                return XFS_ERROR(EIO);
 793        }
 794
 795        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 796        ASSERT(dp->i_df.if_u1.if_data != NULL);
 797
 798        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 799
 800        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 801
 802        /*
 803         * If the block number in the offset is out of range, we're done.
 804         */
 805        if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk)
 806                return 0;
 807
 808        /*
 809         * Precalculate offsets for . and .. as we will always need them.
 810         *
 811         * XXX(hch): the second argument is sometimes 0 and sometimes
 812         * mp->m_dirdatablk.
 813         */
 814        dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 815                                             XFS_DIR2_DATA_DOT_OFFSET);
 816        dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 817                                                XFS_DIR2_DATA_DOTDOT_OFFSET);
 818
 819        /*
 820         * Put . entry unless we're starting past it.
 821         */
 822        if (*offset <= dot_offset) {
 823                if (filldir(dirent, ".", 1, dot_offset & 0x7fffffff, dp->i_ino, DT_DIR)) {
 824                        *offset = dot_offset & 0x7fffffff;
 825                        return 0;
 826                }
 827        }
 828
 829        /*
 830         * Put .. entry unless we're starting past it.
 831         */
 832        if (*offset <= dotdot_offset) {
 833                ino = xfs_dir2_sf_get_parent_ino(sfp);
 834                if (filldir(dirent, "..", 2, dotdot_offset & 0x7fffffff, ino, DT_DIR)) {
 835                        *offset = dotdot_offset & 0x7fffffff;
 836                        return 0;
 837                }
 838        }
 839
 840        /*
 841         * Loop while there are more entries and put'ing works.
 842         */
 843        sfep = xfs_dir2_sf_firstentry(sfp);
 844        for (i = 0; i < sfp->count; i++) {
 845                off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 846                                xfs_dir2_sf_get_offset(sfep));
 847
 848                if (*offset > off) {
 849                        sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 850                        continue;
 851                }
 852
 853                ino = xfs_dir2_sfe_get_ino(sfp, sfep);
 854                if (filldir(dirent, (char *)sfep->name, sfep->namelen,
 855                            off & 0x7fffffff, ino, DT_UNKNOWN)) {
 856                        *offset = off & 0x7fffffff;
 857                        return 0;
 858                }
 859                sfep = xfs_dir2_sf_nextentry(sfp, sfep);
 860        }
 861
 862        *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0) &
 863                        0x7fffffff;
 864        return 0;
 865}
 866
 867/*
 868 * Lookup an entry in a shortform directory.
 869 * Returns EEXIST if found, ENOENT if not found.
 870 */
 871int                                             /* error */
 872xfs_dir2_sf_lookup(
 873        xfs_da_args_t           *args)          /* operation arguments */
 874{
 875        xfs_inode_t             *dp;            /* incore directory inode */
 876        int                     i;              /* entry index */
 877        int                     error;
 878        xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 879        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 880        enum xfs_dacmp          cmp;            /* comparison result */
 881        xfs_dir2_sf_entry_t     *ci_sfep;       /* case-insens. entry */
 882
 883        trace_xfs_dir2_sf_lookup(args);
 884
 885        xfs_dir2_sf_check(args);
 886        dp = args->dp;
 887
 888        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 889        /*
 890         * Bail out if the directory is way too short.
 891         */
 892        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 893                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 894                return XFS_ERROR(EIO);
 895        }
 896        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 897        ASSERT(dp->i_df.if_u1.if_data != NULL);
 898        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 899        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 900        /*
 901         * Special case for .
 902         */
 903        if (args->namelen == 1 && args->name[0] == '.') {
 904                args->inumber = dp->i_ino;
 905                args->cmpresult = XFS_CMP_EXACT;
 906                return XFS_ERROR(EEXIST);
 907        }
 908        /*
 909         * Special case for ..
 910         */
 911        if (args->namelen == 2 &&
 912            args->name[0] == '.' && args->name[1] == '.') {
 913                args->inumber = xfs_dir2_sf_get_parent_ino(sfp);
 914                args->cmpresult = XFS_CMP_EXACT;
 915                return XFS_ERROR(EEXIST);
 916        }
 917        /*
 918         * Loop over all the entries trying to match ours.
 919         */
 920        ci_sfep = NULL;
 921        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 922                                i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
 923                /*
 924                 * Compare name and if it's an exact match, return the inode
 925                 * number. If it's the first case-insensitive match, store the
 926                 * inode number and continue looking for an exact match.
 927                 */
 928                cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
 929                                                                sfep->namelen);
 930                if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
 931                        args->cmpresult = cmp;
 932                        args->inumber = xfs_dir2_sfe_get_ino(sfp, sfep);
 933                        if (cmp == XFS_CMP_EXACT)
 934                                return XFS_ERROR(EEXIST);
 935                        ci_sfep = sfep;
 936                }
 937        }
 938        ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 939        /*
 940         * Here, we can only be doing a lookup (not a rename or replace).
 941         * If a case-insensitive match was not found, return ENOENT.
 942         */
 943        if (!ci_sfep)
 944                return XFS_ERROR(ENOENT);
 945        /* otherwise process the CI match as required by the caller */
 946        error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
 947        return XFS_ERROR(error);
 948}
 949
 950/*
 951 * Remove an entry from a shortform directory.
 952 */
 953int                                             /* error */
 954xfs_dir2_sf_removename(
 955        xfs_da_args_t           *args)
 956{
 957        int                     byteoff;        /* offset of removed entry */
 958        xfs_inode_t             *dp;            /* incore directory inode */
 959        int                     entsize;        /* this entry's size */
 960        int                     i;              /* shortform entry index */
 961        int                     newsize;        /* new inode size */
 962        int                     oldsize;        /* old inode size */
 963        xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 964        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 965
 966        trace_xfs_dir2_sf_removename(args);
 967
 968        dp = args->dp;
 969
 970        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 971        oldsize = (int)dp->i_d.di_size;
 972        /*
 973         * Bail out if the directory is way too short.
 974         */
 975        if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 976                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 977                return XFS_ERROR(EIO);
 978        }
 979        ASSERT(dp->i_df.if_bytes == oldsize);
 980        ASSERT(dp->i_df.if_u1.if_data != NULL);
 981        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 982        ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
 983        /*
 984         * Loop over the old directory entries.
 985         * Find the one we're deleting.
 986         */
 987        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 988                                i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
 989                if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
 990                                                                XFS_CMP_EXACT) {
 991                        ASSERT(xfs_dir2_sfe_get_ino(sfp, sfep) ==
 992                               args->inumber);
 993                        break;
 994                }
 995        }
 996        /*
 997         * Didn't find it.
 998         */
 999        if (i == sfp->count)
1000                return XFS_ERROR(ENOENT);
1001        /*
1002         * Calculate sizes.
1003         */
1004        byteoff = (int)((char *)sfep - (char *)sfp);
1005        entsize = xfs_dir2_sf_entsize(sfp, args->namelen);
1006        newsize = oldsize - entsize;
1007        /*
1008         * Copy the part if any after the removed entry, sliding it down.
1009         */
1010        if (byteoff + entsize < oldsize)
1011                memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
1012                        oldsize - (byteoff + entsize));
1013        /*
1014         * Fix up the header and file size.
1015         */
1016        sfp->count--;
1017        dp->i_d.di_size = newsize;
1018        /*
1019         * Reallocate, making it smaller.
1020         */
1021        xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
1022        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1023#if XFS_BIG_INUMS
1024        /*
1025         * Are we changing inode number size?
1026         */
1027        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1028                if (sfp->i8count == 1)
1029                        xfs_dir2_sf_toino4(args);
1030                else
1031                        sfp->i8count--;
1032        }
1033#endif
1034        xfs_dir2_sf_check(args);
1035        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1036        return 0;
1037}
1038
1039/*
1040 * Replace the inode number of an entry in a shortform directory.
1041 */
1042int                                             /* error */
1043xfs_dir2_sf_replace(
1044        xfs_da_args_t           *args)          /* operation arguments */
1045{
1046        xfs_inode_t             *dp;            /* incore directory inode */
1047        int                     i;              /* entry index */
1048#if XFS_BIG_INUMS || defined(DEBUG)
1049        xfs_ino_t               ino=0;          /* entry old inode number */
1050#endif
1051#if XFS_BIG_INUMS
1052        int                     i8elevated;     /* sf_toino8 set i8count=1 */
1053#endif
1054        xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
1055        xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
1056
1057        trace_xfs_dir2_sf_replace(args);
1058
1059        dp = args->dp;
1060
1061        ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1062        /*
1063         * Bail out if the shortform directory is way too small.
1064         */
1065        if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1066                ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
1067                return XFS_ERROR(EIO);
1068        }
1069        ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1070        ASSERT(dp->i_df.if_u1.if_data != NULL);
1071        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1072        ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
1073#if XFS_BIG_INUMS
1074        /*
1075         * New inode number is large, and need to convert to 8-byte inodes.
1076         */
1077        if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
1078                int     error;                  /* error return value */
1079                int     newsize;                /* new inode size */
1080
1081                newsize =
1082                        dp->i_df.if_bytes +
1083                        (sfp->count + 1) *
1084                        ((uint)sizeof(xfs_dir2_ino8_t) -
1085                         (uint)sizeof(xfs_dir2_ino4_t));
1086                /*
1087                 * Won't fit as shortform, convert to block then do replace.
1088                 */
1089                if (newsize > XFS_IFORK_DSIZE(dp)) {
1090                        error = xfs_dir2_sf_to_block(args);
1091                        if (error) {
1092                                return error;
1093                        }
1094                        return xfs_dir2_block_replace(args);
1095                }
1096                /*
1097                 * Still fits, convert to 8-byte now.
1098                 */
1099                xfs_dir2_sf_toino8(args);
1100                i8elevated = 1;
1101                sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1102        } else
1103                i8elevated = 0;
1104#endif
1105        ASSERT(args->namelen != 1 || args->name[0] != '.');
1106        /*
1107         * Replace ..'s entry.
1108         */
1109        if (args->namelen == 2 &&
1110            args->name[0] == '.' && args->name[1] == '.') {
1111#if XFS_BIG_INUMS || defined(DEBUG)
1112                ino = xfs_dir2_sf_get_parent_ino(sfp);
1113                ASSERT(args->inumber != ino);
1114#endif
1115                xfs_dir2_sf_put_parent_ino(sfp, args->inumber);
1116        }
1117        /*
1118         * Normal entry, look for the name.
1119         */
1120        else {
1121                for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
1122                                i < sfp->count;
1123                                i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
1124                        if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1125                                                                XFS_CMP_EXACT) {
1126#if XFS_BIG_INUMS || defined(DEBUG)
1127                                ino = xfs_dir2_sfe_get_ino(sfp, sfep);
1128                                ASSERT(args->inumber != ino);
1129#endif
1130                                xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
1131                                break;
1132                        }
1133                }
1134                /*
1135                 * Didn't find it.
1136                 */
1137                if (i == sfp->count) {
1138                        ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1139#if XFS_BIG_INUMS
1140                        if (i8elevated)
1141                                xfs_dir2_sf_toino4(args);
1142#endif
1143                        return XFS_ERROR(ENOENT);
1144                }
1145        }
1146#if XFS_BIG_INUMS
1147        /*
1148         * See if the old number was large, the new number is small.
1149         */
1150        if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1151            args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1152                /*
1153                 * And the old count was one, so need to convert to small.
1154                 */
1155                if (sfp->i8count == 1)
1156                        xfs_dir2_sf_toino4(args);
1157                else
1158                        sfp->i8count--;
1159        }
1160        /*
1161         * See if the old number was small, the new number is large.
1162         */
1163        if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1164            args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1165                /*
1166                 * add to the i8count unless we just converted to 8-byte
1167                 * inodes (which does an implied i8count = 1)
1168                 */
1169                ASSERT(sfp->i8count != 0);
1170                if (!i8elevated)
1171                        sfp->i8count++;
1172        }
1173#endif
1174        xfs_dir2_sf_check(args);
1175        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1176        return 0;
1177}
1178
1179#if XFS_BIG_INUMS
1180/*
1181 * Convert from 8-byte inode numbers to 4-byte inode numbers.
1182 * The last 8-byte inode number is gone, but the count is still 1.
1183 */
1184static void
1185xfs_dir2_sf_toino4(
1186        xfs_da_args_t           *args)          /* operation arguments */
1187{
1188        char                    *buf;           /* old dir's buffer */
1189        xfs_inode_t             *dp;            /* incore directory inode */
1190        int                     i;              /* entry index */
1191        int                     newsize;        /* new inode size */
1192        xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1193        xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
1194        int                     oldsize;        /* old inode size */
1195        xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1196        xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
1197
1198        trace_xfs_dir2_sf_toino4(args);
1199
1200        dp = args->dp;
1201
1202        /*
1203         * Copy the old directory to the buffer.
1204         * Then nuke it from the inode, and add the new buffer to the inode.
1205         * Don't want xfs_idata_realloc copying the data here.
1206         */
1207        oldsize = dp->i_df.if_bytes;
1208        buf = kmem_alloc(oldsize, KM_SLEEP);
1209        oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1210        ASSERT(oldsfp->i8count == 1);
1211        memcpy(buf, oldsfp, oldsize);
1212        /*
1213         * Compute the new inode size.
1214         */
1215        newsize =
1216                oldsize -
1217                (oldsfp->count + 1) *
1218                ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1219        xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1220        xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1221        /*
1222         * Reset our pointers, the data has moved.
1223         */
1224        oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1225        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1226        /*
1227         * Fill in the new header.
1228         */
1229        sfp->count = oldsfp->count;
1230        sfp->i8count = 0;
1231        xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
1232        /*
1233         * Copy the entries field by field.
1234         */
1235        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1236                    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1237             i < sfp->count;
1238             i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1239                  oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1240                sfep->namelen = oldsfep->namelen;
1241                sfep->offset = oldsfep->offset;
1242                memcpy(sfep->name, oldsfep->name, sfep->namelen);
1243                xfs_dir2_sfe_put_ino(sfp, sfep,
1244                        xfs_dir2_sfe_get_ino(oldsfp, oldsfep));
1245        }
1246        /*
1247         * Clean up the inode.
1248         */
1249        kmem_free(buf);
1250        dp->i_d.di_size = newsize;
1251        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1252}
1253
1254/*
1255 * Convert from 4-byte inode numbers to 8-byte inode numbers.
1256 * The new 8-byte inode number is not there yet, we leave with the
1257 * count 1 but no corresponding entry.
1258 */
1259static void
1260xfs_dir2_sf_toino8(
1261        xfs_da_args_t           *args)          /* operation arguments */
1262{
1263        char                    *buf;           /* old dir's buffer */
1264        xfs_inode_t             *dp;            /* incore directory inode */
1265        int                     i;              /* entry index */
1266        int                     newsize;        /* new inode size */
1267        xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1268        xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
1269        int                     oldsize;        /* old inode size */
1270        xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1271        xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
1272
1273        trace_xfs_dir2_sf_toino8(args);
1274
1275        dp = args->dp;
1276
1277        /*
1278         * Copy the old directory to the buffer.
1279         * Then nuke it from the inode, and add the new buffer to the inode.
1280         * Don't want xfs_idata_realloc copying the data here.
1281         */
1282        oldsize = dp->i_df.if_bytes;
1283        buf = kmem_alloc(oldsize, KM_SLEEP);
1284        oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1285        ASSERT(oldsfp->i8count == 0);
1286        memcpy(buf, oldsfp, oldsize);
1287        /*
1288         * Compute the new inode size.
1289         */
1290        newsize =
1291                oldsize +
1292                (oldsfp->count + 1) *
1293                ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1294        xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1295        xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1296        /*
1297         * Reset our pointers, the data has moved.
1298         */
1299        oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1300        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1301        /*
1302         * Fill in the new header.
1303         */
1304        sfp->count = oldsfp->count;
1305        sfp->i8count = 1;
1306        xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
1307        /*
1308         * Copy the entries field by field.
1309         */
1310        for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1311                    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1312             i < sfp->count;
1313             i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1314                  oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1315                sfep->namelen = oldsfep->namelen;
1316                sfep->offset = oldsfep->offset;
1317                memcpy(sfep->name, oldsfep->name, sfep->namelen);
1318                xfs_dir2_sfe_put_ino(sfp, sfep,
1319                        xfs_dir2_sfe_get_ino(oldsfp, oldsfep));
1320        }
1321        /*
1322         * Clean up the inode.
1323         */
1324        kmem_free(buf);
1325        dp->i_d.di_size = newsize;
1326        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1327}
1328#endif  /* XFS_BIG_INUMS */
1329
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