fs/xfs/libxfs/xfs_dir2_sf.c

   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_format.h"
   9 #include "xfs_log_format.h"
  10 #include "xfs_trans_resv.h"
  11 #include "xfs_mount.h"
  12 #include "xfs_da_format.h"
  13 #include "xfs_da_btree.h"
  14 #include "xfs_inode.h"
  15 #include "xfs_trans.h"
  16 #include "xfs_inode_item.h"
  17 #include "xfs_error.h"
  18 #include "xfs_dir2.h"
  19 #include "xfs_dir2_priv.h"
  20 #include "xfs_trace.h"
  21
  22 /*
  23  * Prototypes for internal functions.
  24  */
  25 static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
  26                                      xfs_dir2_sf_entry_t *sfep,
  27                                      xfs_dir2_data_aoff_t offset,
  28                                      int new_isize);
  29 static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
  30                                      int new_isize);
  31 static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
  32                                     xfs_dir2_sf_entry_t **sfepp,
  33                                     xfs_dir2_data_aoff_t *offsetp);
  34 #ifdef DEBUG
  35 static void xfs_dir2_sf_check(xfs_da_args_t *args);
  36 #else
  37 #define xfs_dir2_sf_check(args)
  38 #endif /* DEBUG */
  39
  40 static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
  41 static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
  42
  43 /*
  44  * Given a block directory (dp/block), calculate its size as a shortform (sf)
  45  * directory and a header for the sf directory, if it will fit it the
  46  * space currently present in the inode.  If it won't fit, the output
  47  * size is too big (but not accurate).
  48  */
  49 int                                             /* size for sf form */
  50 xfs_dir2_block_sfsize(
  51         xfs_inode_t             *dp,            /* incore inode pointer */
  52         xfs_dir2_data_hdr_t     *hdr,           /* block directory data */
  53         xfs_dir2_sf_hdr_t       *sfhp)          /* output: header for sf form */
  54 {
  55         xfs_dir2_dataptr_t      addr;           /* data entry address */
  56         xfs_dir2_leaf_entry_t   *blp;           /* leaf area of the block */
  57         xfs_dir2_block_tail_t   *btp;           /* tail area of the block */
  58         int                     count;          /* shortform entry count */
  59         xfs_dir2_data_entry_t   *dep;           /* data entry in the block */
  60         int                     i;              /* block entry index */
  61         int                     i8count;        /* count of big-inode entries */
  62         int                     isdot;          /* entry is "." */
  63         int                     isdotdot;       /* entry is ".." */
  64         xfs_mount_t             *mp;            /* mount structure pointer */
  65         int                     namelen;        /* total name bytes */
  66         xfs_ino_t               parent = 0;     /* parent inode number */
  67         int                     size=0;         /* total computed size */
  68         int                     has_ftype;
  69         struct xfs_da_geometry  *geo;
  70
  71         mp = dp->i_mount;
  72         geo = mp->m_dir_geo;
  73
  74         /*
  75          * if there is a filetype field, add the extra byte to the namelen
  76          * for each entry that we see.
  77          */
  78         has_ftype = xfs_sb_version_hasftype(&mp->m_sb) ? 1 : 0;
  79
  80         count = i8count = namelen = 0;
  81         btp = xfs_dir2_block_tail_p(geo, hdr);
  82         blp = xfs_dir2_block_leaf_p(btp);
  83
  84         /*
  85          * Iterate over the block's data entries by using the leaf pointers.
  86          */
  87         for (i = 0; i < be32_to_cpu(btp->count); i++) {
  88                 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
  89                         continue;
  90                 /*
  91                  * Calculate the pointer to the entry at hand.
  92                  */
  93                 dep = (xfs_dir2_data_entry_t *)((char *)hdr +
  94                                 xfs_dir2_dataptr_to_off(geo, addr));
  95                 /*
  96                  * Detect . and .., so we can special-case them.
  97                  * . is not included in sf directories.
  98                  * .. is included by just the parent inode number.
  99                  */
 100                 isdot = dep->namelen == 1 && dep->name[0] == '.';
 101                 isdotdot =
 102                         dep->namelen == 2 &&
 103                         dep->name[0] == '.' && dep->name[1] == '.';
 104
 105                 if (!isdot)
 106                         i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
 107
 108                 /* take into account the file type field */
 109                 if (!isdot && !isdotdot) {
 110                         count++;
 111                         namelen += dep->namelen + has_ftype;
 112                 } else if (isdotdot)
 113                         parent = be64_to_cpu(dep->inumber);
 114                 /*
 115                  * Calculate the new size, see if we should give up yet.
 116                  */
 117                 size = xfs_dir2_sf_hdr_size(i8count) +  /* header */
 118                        count * 3 * sizeof(u8) +         /* namelen + offset */
 119                        namelen +                        /* name */
 120                        (i8count ?                       /* inumber */
 121                                 count * XFS_INO64_SIZE :
 122                                 count * XFS_INO32_SIZE);
 123                 if (size > XFS_IFORK_DSIZE(dp))
 124                         return size;            /* size value is a failure */
 125         }
 126         /*
 127          * Create the output header, if it worked.
 128          */
 129         sfhp->count = count;
 130         sfhp->i8count = i8count;
 131         dp->d_ops->sf_put_parent_ino(sfhp, parent);
 132         return size;
 133 }
 134
 135 /*
 136  * Convert a block format directory to shortform.
 137  * Caller has already checked that it will fit, and built us a header.
 138  */
 139 int                                             /* error */
 140 xfs_dir2_block_to_sf(
 141         xfs_da_args_t           *args,          /* operation arguments */
 142         struct xfs_buf          *bp,
 143         int                     size,           /* shortform directory size */
 144         xfs_dir2_sf_hdr_t       *sfhp)          /* shortform directory hdr */
 145 {
 146         xfs_dir2_data_hdr_t     *hdr;           /* block header */
 147         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
 148         xfs_inode_t             *dp;            /* incore directory inode */
 149         xfs_dir2_data_unused_t  *dup;           /* unused data pointer */
 150         char                    *endptr;        /* end of data entries */
 151         int                     error;          /* error return value */
 152         int                     logflags;       /* inode logging flags */
 153         xfs_mount_t             *mp;            /* filesystem mount point */
 154         char                    *ptr;           /* current data pointer */
 155         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 156         xfs_dir2_sf_hdr_t       *sfp;           /* shortform directory header */
 157         xfs_dir2_sf_hdr_t       *dst;           /* temporary data buffer */
 158
 159         trace_xfs_dir2_block_to_sf(args);
 160
 161         dp = args->dp;
 162         mp = dp->i_mount;
 163
 164         /*
 165          * allocate a temporary destination buffer the size of the inode
 166          * to format the data into. Once we have formatted the data, we
 167          * can free the block and copy the formatted data into the inode literal
 168          * area.
 169          */
 170         dst = kmem_alloc(mp->m_sb.sb_inodesize, KM_SLEEP);
 171         hdr = bp->b_addr;
 172
 173         /*
 174          * Copy the header into the newly allocate local space.
 175          */
 176         sfp = (xfs_dir2_sf_hdr_t *)dst;
 177         memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
 178
 179         /*
 180          * Set up to loop over the block's entries.
 181          */
 182         ptr = (char *)dp->d_ops->data_entry_p(hdr);
 183         endptr = xfs_dir3_data_endp(args->geo, hdr);
 184         sfep = xfs_dir2_sf_firstentry(sfp);
 185         /*
 186          * Loop over the active and unused entries.
 187          * Stop when we reach the leaf/tail portion of the block.
 188          */
 189         while (ptr < endptr) {
 190                 /*
 191                  * If it's unused, just skip over it.
 192                  */
 193                 dup = (xfs_dir2_data_unused_t *)ptr;
 194                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 195                         ptr += be16_to_cpu(dup->length);
 196                         continue;
 197                 }
 198                 dep = (xfs_dir2_data_entry_t *)ptr;
 199                 /*
 200                  * Skip .
 201                  */
 202                 if (dep->namelen == 1 && dep->name[0] == '.')
 203                         ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
 204                 /*
 205                  * Skip .., but make sure the inode number is right.
 206                  */
 207                 else if (dep->namelen == 2 &&
 208                          dep->name[0] == '.' && dep->name[1] == '.')
 209                         ASSERT(be64_to_cpu(dep->inumber) ==
 210                                dp->d_ops->sf_get_parent_ino(sfp));
 211                 /*
 212                  * Normal entry, copy it into shortform.
 213                  */
 214                 else {
 215                         sfep->namelen = dep->namelen;
 216                         xfs_dir2_sf_put_offset(sfep,
 217                                 (xfs_dir2_data_aoff_t)
 218                                 ((char *)dep - (char *)hdr));
 219                         memcpy(sfep->name, dep->name, dep->namelen);
 220                         dp->d_ops->sf_put_ino(sfp, sfep,
 221                                               be64_to_cpu(dep->inumber));
 222                         dp->d_ops->sf_put_ftype(sfep,
 223                                         dp->d_ops->data_get_ftype(dep));
 224
 225                         sfep = dp->d_ops->sf_nextentry(sfp, sfep);
 226                 }
 227                 ptr += dp->d_ops->data_entsize(dep->namelen);
 228         }
 229         ASSERT((char *)sfep - (char *)sfp == size);
 230
 231         /* now we are done with the block, we can shrink the inode */
 232         logflags = XFS_ILOG_CORE;
 233         error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp);
 234         if (error) {
 235                 ASSERT(error != -ENOSPC);
 236                 goto out;
 237         }
 238
 239         /*
 240          * The buffer is now unconditionally gone, whether
 241          * xfs_dir2_shrink_inode worked or not.
 242          *
 243          * Convert the inode to local format and copy the data in.
 244          */
 245         ASSERT(dp->i_df.if_bytes == 0);
 246         xfs_init_local_fork(dp, XFS_DATA_FORK, dst, size);
 247         dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 248         dp->i_d.di_size = size;
 249
 250         logflags |= XFS_ILOG_DDATA;
 251         xfs_dir2_sf_check(args);
 252 out:
 253         xfs_trans_log_inode(args->trans, dp, logflags);
 254         kmem_free(dst);
 255         return error;
 256 }
 257
 258 /*
 259  * Add a name to a shortform directory.
 260  * There are two algorithms, "easy" and "hard" which we decide on
 261  * before changing anything.
 262  * Convert to block form if necessary, if the new entry won't fit.
 263  */
 264 int                                             /* error */
 265 xfs_dir2_sf_addname(
 266         xfs_da_args_t           *args)          /* operation arguments */
 267 {
 268         xfs_inode_t             *dp;            /* incore directory inode */
 269         int                     error;          /* error return value */
 270         int                     incr_isize;     /* total change in size */
 271         int                     new_isize;      /* di_size after adding name */
 272         int                     objchange;      /* changing to 8-byte inodes */
 273         xfs_dir2_data_aoff_t    offset = 0;     /* offset for new entry */
 274         int                     pick;           /* which algorithm to use */
 275         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 276         xfs_dir2_sf_entry_t     *sfep = NULL;   /* shortform entry */
 277
 278         trace_xfs_dir2_sf_addname(args);
 279
 280         ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
 281         dp = args->dp;
 282         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 283         /*
 284          * Make sure the shortform value has some of its header.
 285          */
 286         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 287                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 288                 return -EIO;
 289         }
 290         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 291         ASSERT(dp->i_df.if_u1.if_data != NULL);
 292         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 293         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 294         /*
 295          * Compute entry (and change in) size.
 296          */
 297         incr_isize = dp->d_ops->sf_entsize(sfp, args->namelen);
 298         objchange = 0;
 299
 300         /*
 301          * Do we have to change to 8 byte inodes?
 302          */
 303         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
 304                 /*
 305                  * Yes, adjust the inode size.  old count + (parent + new)
 306                  */
 307                 incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
 308                 objchange = 1;
 309         }
 310
 311         new_isize = (int)dp->i_d.di_size + incr_isize;
 312         /*
 313          * Won't fit as shortform any more (due to size),
 314          * or the pick routine says it won't (due to offset values).
 315          */
 316         if (new_isize > XFS_IFORK_DSIZE(dp) ||
 317             (pick =
 318              xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
 319                 /*
 320                  * Just checking or no space reservation, it doesn't fit.
 321                  */
 322                 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
 323                         return -ENOSPC;
 324                 /*
 325                  * Convert to block form then add the name.
 326                  */
 327                 error = xfs_dir2_sf_to_block(args);
 328                 if (error)
 329                         return error;
 330                 return xfs_dir2_block_addname(args);
 331         }
 332         /*
 333          * Just checking, it fits.
 334          */
 335         if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 336                 return 0;
 337         /*
 338          * Do it the easy way - just add it at the end.
 339          */
 340         if (pick == 1)
 341                 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
 342         /*
 343          * Do it the hard way - look for a place to insert the new entry.
 344          * Convert to 8 byte inode numbers first if necessary.
 345          */
 346         else {
 347                 ASSERT(pick == 2);
 348                 if (objchange)
 349                         xfs_dir2_sf_toino8(args);
 350                 xfs_dir2_sf_addname_hard(args, objchange, new_isize);
 351         }
 352         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 353         return 0;
 354 }
 355
 356 /*
 357  * Add the new entry the "easy" way.
 358  * This is copying the old directory and adding the new entry at the end.
 359  * Since it's sorted by "offset" we need room after the last offset
 360  * that's already there, and then room to convert to a block directory.
 361  * This is already checked by the pick routine.
 362  */
 363 static void
 364 xfs_dir2_sf_addname_easy(
 365         xfs_da_args_t           *args,          /* operation arguments */
 366         xfs_dir2_sf_entry_t     *sfep,          /* pointer to new entry */
 367         xfs_dir2_data_aoff_t    offset,         /* offset to use for new ent */
 368         int                     new_isize)      /* new directory size */
 369 {
 370         int                     byteoff;        /* byte offset in sf dir */
 371         xfs_inode_t             *dp;            /* incore directory inode */
 372         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 373
 374         dp = args->dp;
 375
 376         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 377         byteoff = (int)((char *)sfep - (char *)sfp);
 378         /*
 379          * Grow the in-inode space.
 380          */
 381         xfs_idata_realloc(dp, dp->d_ops->sf_entsize(sfp, args->namelen),
 382                           XFS_DATA_FORK);
 383         /*
 384          * Need to set up again due to realloc of the inode data.
 385          */
 386         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 387         sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
 388         /*
 389          * Fill in the new entry.
 390          */
 391         sfep->namelen = args->namelen;
 392         xfs_dir2_sf_put_offset(sfep, offset);
 393         memcpy(sfep->name, args->name, sfep->namelen);
 394         dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
 395         dp->d_ops->sf_put_ftype(sfep, args->filetype);
 396
 397         /*
 398          * Update the header and inode.
 399          */
 400         sfp->count++;
 401         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
 402                 sfp->i8count++;
 403         dp->i_d.di_size = new_isize;
 404         xfs_dir2_sf_check(args);
 405 }
 406
 407 /*
 408  * Add the new entry the "hard" way.
 409  * The caller has already converted to 8 byte inode numbers if necessary,
 410  * in which case we need to leave the i8count at 1.
 411  * Find a hole that the new entry will fit into, and copy
 412  * the first part of the entries, the new entry, and the last part of
 413  * the entries.
 414  */
 415 /* ARGSUSED */
 416 static void
 417 xfs_dir2_sf_addname_hard(
 418         xfs_da_args_t           *args,          /* operation arguments */
 419         int                     objchange,      /* changing inode number size */
 420         int                     new_isize)      /* new directory size */
 421 {
 422         int                     add_datasize;   /* data size need for new ent */
 423         char                    *buf;           /* buffer for old */
 424         xfs_inode_t             *dp;            /* incore directory inode */
 425         int                     eof;            /* reached end of old dir */
 426         int                     nbytes;         /* temp for byte copies */
 427         xfs_dir2_data_aoff_t    new_offset;     /* next offset value */
 428         xfs_dir2_data_aoff_t    offset;         /* current offset value */
 429         int                     old_isize;      /* previous di_size */
 430         xfs_dir2_sf_entry_t     *oldsfep;       /* entry in original dir */
 431         xfs_dir2_sf_hdr_t       *oldsfp;        /* original shortform dir */
 432         xfs_dir2_sf_entry_t     *sfep;          /* entry in new dir */
 433         xfs_dir2_sf_hdr_t       *sfp;           /* new shortform dir */
 434
 435         /*
 436          * Copy the old directory to the stack buffer.
 437          */
 438         dp = args->dp;
 439
 440         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 441         old_isize = (int)dp->i_d.di_size;
 442         buf = kmem_alloc(old_isize, KM_SLEEP);
 443         oldsfp = (xfs_dir2_sf_hdr_t *)buf;
 444         memcpy(oldsfp, sfp, old_isize);
 445         /*
 446          * Loop over the old directory finding the place we're going
 447          * to insert the new entry.
 448          * If it's going to end up at the end then oldsfep will point there.
 449          */
 450         for (offset = dp->d_ops->data_first_offset,
 451               oldsfep = xfs_dir2_sf_firstentry(oldsfp),
 452               add_datasize = dp->d_ops->data_entsize(args->namelen),
 453               eof = (char *)oldsfep == &buf[old_isize];
 454              !eof;
 455              offset = new_offset + dp->d_ops->data_entsize(oldsfep->namelen),
 456               oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep),
 457               eof = (char *)oldsfep == &buf[old_isize]) {
 458                 new_offset = xfs_dir2_sf_get_offset(oldsfep);
 459                 if (offset + add_datasize <= new_offset)
 460                         break;
 461         }
 462         /*
 463          * Get rid of the old directory, then allocate space for
 464          * the new one.  We do this so xfs_idata_realloc won't copy
 465          * the data.
 466          */
 467         xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
 468         xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
 469         /*
 470          * Reset the pointer since the buffer was reallocated.
 471          */
 472         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 473         /*
 474          * Copy the first part of the directory, including the header.
 475          */
 476         nbytes = (int)((char *)oldsfep - (char *)oldsfp);
 477         memcpy(sfp, oldsfp, nbytes);
 478         sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
 479         /*
 480          * Fill in the new entry, and update the header counts.
 481          */
 482         sfep->namelen = args->namelen;
 483         xfs_dir2_sf_put_offset(sfep, offset);
 484         memcpy(sfep->name, args->name, sfep->namelen);
 485         dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
 486         dp->d_ops->sf_put_ftype(sfep, args->filetype);
 487         sfp->count++;
 488         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
 489                 sfp->i8count++;
 490         /*
 491          * If there's more left to copy, do that.
 492          */
 493         if (!eof) {
 494                 sfep = dp->d_ops->sf_nextentry(sfp, sfep);
 495                 memcpy(sfep, oldsfep, old_isize - nbytes);
 496         }
 497         kmem_free(buf);
 498         dp->i_d.di_size = new_isize;
 499         xfs_dir2_sf_check(args);
 500 }
 501
 502 /*
 503  * Decide if the new entry will fit at all.
 504  * If it will fit, pick between adding the new entry to the end (easy)
 505  * or somewhere else (hard).
 506  * Return 0 (won't fit), 1 (easy), 2 (hard).
 507  */
 508 /*ARGSUSED*/
 509 static int                                      /* pick result */
 510 xfs_dir2_sf_addname_pick(
 511         xfs_da_args_t           *args,          /* operation arguments */
 512         int                     objchange,      /* inode # size changes */
 513         xfs_dir2_sf_entry_t     **sfepp,        /* out(1): new entry ptr */
 514         xfs_dir2_data_aoff_t    *offsetp)       /* out(1): new offset */
 515 {
 516         xfs_inode_t             *dp;            /* incore directory inode */
 517         int                     holefit;        /* found hole it will fit in */
 518         int                     i;              /* entry number */
 519         xfs_dir2_data_aoff_t    offset;         /* data block offset */
 520         xfs_dir2_sf_entry_t     *sfep;          /* shortform entry */
 521         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 522         int                     size;           /* entry's data size */
 523         int                     used;           /* data bytes used */
 524
 525         dp = args->dp;
 526
 527         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 528         size = dp->d_ops->data_entsize(args->namelen);
 529         offset = dp->d_ops->data_first_offset;
 530         sfep = xfs_dir2_sf_firstentry(sfp);
 531         holefit = 0;
 532         /*
 533          * Loop over sf entries.
 534          * Keep track of data offset and whether we've seen a place
 535          * to insert the new entry.
 536          */
 537         for (i = 0; i < sfp->count; i++) {
 538                 if (!holefit)
 539                         holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
 540                 offset = xfs_dir2_sf_get_offset(sfep) +
 541                          dp->d_ops->data_entsize(sfep->namelen);
 542                 sfep = dp->d_ops->sf_nextentry(sfp, sfep);
 543         }
 544         /*
 545          * Calculate data bytes used excluding the new entry, if this
 546          * was a data block (block form directory).
 547          */
 548         used = offset +
 549                (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 550                (uint)sizeof(xfs_dir2_block_tail_t);
 551         /*
 552          * If it won't fit in a block form then we can't insert it,
 553          * we'll go back, convert to block, then try the insert and convert
 554          * to leaf.
 555          */
 556         if (used + (holefit ? 0 : size) > args->geo->blksize)
 557                 return 0;
 558         /*
 559          * If changing the inode number size, do it the hard way.
 560          */
 561         if (objchange)
 562                 return 2;
 563         /*
 564          * If it won't fit at the end then do it the hard way (use the hole).
 565          */
 566         if (used + size > args->geo->blksize)
 567                 return 2;
 568         /*
 569          * Do it the easy way.
 570          */
 571         *sfepp = sfep;
 572         *offsetp = offset;
 573         return 1;
 574 }
 575
 576 #ifdef DEBUG
 577 /*
 578  * Check consistency of shortform directory, assert if bad.
 579  */
 580 static void
 581 xfs_dir2_sf_check(
 582         xfs_da_args_t           *args)          /* operation arguments */
 583 {
 584         xfs_inode_t             *dp;            /* incore directory inode */
 585         int                     i;              /* entry number */
 586         int                     i8count;        /* number of big inode#s */
 587         xfs_ino_t               ino;            /* entry inode number */
 588         int                     offset;         /* data offset */
 589         xfs_dir2_sf_entry_t     *sfep;          /* shortform dir entry */
 590         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 591
 592         dp = args->dp;
 593
 594         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 595         offset = dp->d_ops->data_first_offset;
 596         ino = dp->d_ops->sf_get_parent_ino(sfp);
 597         i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 598
 599         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
 600              i < sfp->count;
 601              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 602                 ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
 603                 ino = dp->d_ops->sf_get_ino(sfp, sfep);
 604                 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 605                 offset =
 606                         xfs_dir2_sf_get_offset(sfep) +
 607                         dp->d_ops->data_entsize(sfep->namelen);
 608                 ASSERT(dp->d_ops->sf_get_ftype(sfep) < XFS_DIR3_FT_MAX);
 609         }
 610         ASSERT(i8count == sfp->i8count);
 611         ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
 612         ASSERT(offset +
 613                (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 614                (uint)sizeof(xfs_dir2_block_tail_t) <= args->geo->blksize);
 615 }
 616 #endif  /* DEBUG */
 617
 618 /* Verify the consistency of an inline directory. */
 619 xfs_failaddr_t
 620 xfs_dir2_sf_verify(
 621         struct xfs_inode                *ip)
 622 {
 623         struct xfs_mount                *mp = ip->i_mount;
 624         struct xfs_dir2_sf_hdr          *sfp;
 625         struct xfs_dir2_sf_entry        *sfep;
 626         struct xfs_dir2_sf_entry        *next_sfep;
 627         char                            *endp;
 628         const struct xfs_dir_ops        *dops;
 629         struct xfs_ifork                *ifp;
 630         xfs_ino_t                       ino;
 631         int                             i;
 632         int                             i8count;
 633         int                             offset;
 634         int                             size;
 635         int                             error;
 636         uint8_t                         filetype;
 637
 638         ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_LOCAL);
 639         /*
 640          * xfs_iread calls us before xfs_setup_inode sets up ip->d_ops,
 641          * so we can only trust the mountpoint to have the right pointer.
 642          */
 643         dops = xfs_dir_get_ops(mp, NULL);
 644
 645         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
 646         sfp = (struct xfs_dir2_sf_hdr *)ifp->if_u1.if_data;
 647         size = ifp->if_bytes;
 648
 649         /*
 650          * Give up if the directory is way too short.
 651          */
 652         if (size <= offsetof(struct xfs_dir2_sf_hdr, parent) ||
 653             size < xfs_dir2_sf_hdr_size(sfp->i8count))
 654                 return __this_address;
 655
 656         endp = (char *)sfp + size;
 657
 658         /* Check .. entry */
 659         ino = dops->sf_get_parent_ino(sfp);
 660         i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
 661         error = xfs_dir_ino_validate(mp, ino);
 662         if (error)
 663                 return __this_address;
 664         offset = dops->data_first_offset;
 665
 666         /* Check all reported entries */
 667         sfep = xfs_dir2_sf_firstentry(sfp);
 668         for (i = 0; i < sfp->count; i++) {
 669                 /*
 670                  * struct xfs_dir2_sf_entry has a variable length.
 671                  * Check the fixed-offset parts of the structure are
 672                  * within the data buffer.
 673                  */
 674                 if (((char *)sfep + sizeof(*sfep)) >= endp)
 675                         return __this_address;
 676
 677                 /* Don't allow names with known bad length. */
 678                 if (sfep->namelen == 0)
 679                         return __this_address;
 680
 681                 /*
 682                  * Check that the variable-length part of the structure is
 683                  * within the data buffer.  The next entry starts after the
 684                  * name component, so nextentry is an acceptable test.
 685                  */
 686                 next_sfep = dops->sf_nextentry(sfp, sfep);
 687                 if (endp < (char *)next_sfep)
 688                         return __this_address;
 689
 690                 /* Check that the offsets always increase. */
 691                 if (xfs_dir2_sf_get_offset(sfep) < offset)
 692                         return __this_address;
 693
 694                 /* Check the inode number. */
 695                 ino = dops->sf_get_ino(sfp, sfep);
 696                 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
 697                 error = xfs_dir_ino_validate(mp, ino);
 698                 if (error)
 699                         return __this_address;
 700
 701                 /* Check the file type. */
 702                 filetype = dops->sf_get_ftype(sfep);
 703                 if (filetype >= XFS_DIR3_FT_MAX)
 704                         return __this_address;
 705
 706                 offset = xfs_dir2_sf_get_offset(sfep) +
 707                                 dops->data_entsize(sfep->namelen);
 708
 709                 sfep = next_sfep;
 710         }
 711         if (i8count != sfp->i8count)
 712                 return __this_address;
 713         if ((void *)sfep != (void *)endp)
 714                 return __this_address;
 715
 716         /* Make sure this whole thing ought to be in local format. */
 717         if (offset + (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
 718             (uint)sizeof(xfs_dir2_block_tail_t) > mp->m_dir_geo->blksize)
 719                 return __this_address;
 720
 721         return NULL;
 722 }
 723
 724 /*
 725  * Create a new (shortform) directory.
 726  */
 727 int                                     /* error, always 0 */
 728 xfs_dir2_sf_create(
 729         xfs_da_args_t   *args,          /* operation arguments */
 730         xfs_ino_t       pino)           /* parent inode number */
 731 {
 732         xfs_inode_t     *dp;            /* incore directory inode */
 733         int             i8count;        /* parent inode is an 8-byte number */
 734         xfs_dir2_sf_hdr_t *sfp;         /* shortform structure */
 735         int             size;           /* directory size */
 736
 737         trace_xfs_dir2_sf_create(args);
 738
 739         dp = args->dp;
 740
 741         ASSERT(dp != NULL);
 742         ASSERT(dp->i_d.di_size == 0);
 743         /*
 744          * If it's currently a zero-length extent file,
 745          * convert it to local format.
 746          */
 747         if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
 748                 dp->i_df.if_flags &= ~XFS_IFEXTENTS;    /* just in case */
 749                 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
 750                 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
 751                 dp->i_df.if_flags |= XFS_IFINLINE;
 752         }
 753         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 754         ASSERT(dp->i_df.if_bytes == 0);
 755         i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
 756         size = xfs_dir2_sf_hdr_size(i8count);
 757         /*
 758          * Make a buffer for the data.
 759          */
 760         xfs_idata_realloc(dp, size, XFS_DATA_FORK);
 761         /*
 762          * Fill in the header,
 763          */
 764         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 765         sfp->i8count = i8count;
 766         /*
 767          * Now can put in the inode number, since i8count is set.
 768          */
 769         dp->d_ops->sf_put_parent_ino(sfp, pino);
 770         sfp->count = 0;
 771         dp->i_d.di_size = size;
 772         xfs_dir2_sf_check(args);
 773         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 774         return 0;
 775 }
 776
 777 /*
 778  * Lookup an entry in a shortform directory.
 779  * Returns EEXIST if found, ENOENT if not found.
 780  */
 781 int                                             /* error */
 782 xfs_dir2_sf_lookup(
 783         xfs_da_args_t           *args)          /* operation arguments */
 784 {
 785         xfs_inode_t             *dp;            /* incore directory inode */
 786         int                     i;              /* entry index */
 787         int                     error;
 788         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 789         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 790         enum xfs_dacmp          cmp;            /* comparison result */
 791         xfs_dir2_sf_entry_t     *ci_sfep;       /* case-insens. entry */
 792
 793         trace_xfs_dir2_sf_lookup(args);
 794
 795         xfs_dir2_sf_check(args);
 796         dp = args->dp;
 797
 798         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 799         /*
 800          * Bail out if the directory is way too short.
 801          */
 802         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 803                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 804                 return -EIO;
 805         }
 806         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 807         ASSERT(dp->i_df.if_u1.if_data != NULL);
 808         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 809         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 810         /*
 811          * Special case for .
 812          */
 813         if (args->namelen == 1 && args->name[0] == '.') {
 814                 args->inumber = dp->i_ino;
 815                 args->cmpresult = XFS_CMP_EXACT;
 816                 args->filetype = XFS_DIR3_FT_DIR;
 817                 return -EEXIST;
 818         }
 819         /*
 820          * Special case for ..
 821          */
 822         if (args->namelen == 2 &&
 823             args->name[0] == '.' && args->name[1] == '.') {
 824                 args->inumber = dp->d_ops->sf_get_parent_ino(sfp);
 825                 args->cmpresult = XFS_CMP_EXACT;
 826                 args->filetype = XFS_DIR3_FT_DIR;
 827                 return -EEXIST;
 828         }
 829         /*
 830          * Loop over all the entries trying to match ours.
 831          */
 832         ci_sfep = NULL;
 833         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 834              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 835                 /*
 836                  * Compare name and if it's an exact match, return the inode
 837                  * number. If it's the first case-insensitive match, store the
 838                  * inode number and continue looking for an exact match.
 839                  */
 840                 cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
 841                                                                 sfep->namelen);
 842                 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
 843                         args->cmpresult = cmp;
 844                         args->inumber = dp->d_ops->sf_get_ino(sfp, sfep);
 845                         args->filetype = dp->d_ops->sf_get_ftype(sfep);
 846                         if (cmp == XFS_CMP_EXACT)
 847                                 return -EEXIST;
 848                         ci_sfep = sfep;
 849                 }
 850         }
 851         ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 852         /*
 853          * Here, we can only be doing a lookup (not a rename or replace).
 854          * If a case-insensitive match was not found, return -ENOENT.
 855          */
 856         if (!ci_sfep)
 857                 return -ENOENT;
 858         /* otherwise process the CI match as required by the caller */
 859         error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
 860         return error;
 861 }
 862
 863 /*
 864  * Remove an entry from a shortform directory.
 865  */
 866 int                                             /* error */
 867 xfs_dir2_sf_removename(
 868         xfs_da_args_t           *args)
 869 {
 870         int                     byteoff;        /* offset of removed entry */
 871         xfs_inode_t             *dp;            /* incore directory inode */
 872         int                     entsize;        /* this entry's size */
 873         int                     i;              /* shortform entry index */
 874         int                     newsize;        /* new inode size */
 875         int                     oldsize;        /* old inode size */
 876         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 877         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 878
 879         trace_xfs_dir2_sf_removename(args);
 880
 881         dp = args->dp;
 882
 883         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 884         oldsize = (int)dp->i_d.di_size;
 885         /*
 886          * Bail out if the directory is way too short.
 887          */
 888         if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 889                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 890                 return -EIO;
 891         }
 892         ASSERT(dp->i_df.if_bytes == oldsize);
 893         ASSERT(dp->i_df.if_u1.if_data != NULL);
 894         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 895         ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
 896         /*
 897          * Loop over the old directory entries.
 898          * Find the one we're deleting.
 899          */
 900         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
 901              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
 902                 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
 903                                                                 XFS_CMP_EXACT) {
 904                         ASSERT(dp->d_ops->sf_get_ino(sfp, sfep) ==
 905                                args->inumber);
 906                         break;
 907                 }
 908         }
 909         /*
 910          * Didn't find it.
 911          */
 912         if (i == sfp->count)
 913                 return -ENOENT;
 914         /*
 915          * Calculate sizes.
 916          */
 917         byteoff = (int)((char *)sfep - (char *)sfp);
 918         entsize = dp->d_ops->sf_entsize(sfp, args->namelen);
 919         newsize = oldsize - entsize;
 920         /*
 921          * Copy the part if any after the removed entry, sliding it down.
 922          */
 923         if (byteoff + entsize < oldsize)
 924                 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
 925                         oldsize - (byteoff + entsize));
 926         /*
 927          * Fix up the header and file size.
 928          */
 929         sfp->count--;
 930         dp->i_d.di_size = newsize;
 931         /*
 932          * Reallocate, making it smaller.
 933          */
 934         xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
 935         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 936         /*
 937          * Are we changing inode number size?
 938          */
 939         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
 940                 if (sfp->i8count == 1)
 941                         xfs_dir2_sf_toino4(args);
 942                 else
 943                         sfp->i8count--;
 944         }
 945         xfs_dir2_sf_check(args);
 946         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
 947         return 0;
 948 }
 949
 950 /*
 951  * Replace the inode number of an entry in a shortform directory.
 952  */
 953 int                                             /* error */
 954 xfs_dir2_sf_replace(
 955         xfs_da_args_t           *args)          /* operation arguments */
 956 {
 957         xfs_inode_t             *dp;            /* incore directory inode */
 958         int                     i;              /* entry index */
 959         xfs_ino_t               ino=0;          /* entry old inode number */
 960         int                     i8elevated;     /* sf_toino8 set i8count=1 */
 961         xfs_dir2_sf_entry_t     *sfep;          /* shortform directory entry */
 962         xfs_dir2_sf_hdr_t       *sfp;           /* shortform structure */
 963
 964         trace_xfs_dir2_sf_replace(args);
 965
 966         dp = args->dp;
 967
 968         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
 969         /*
 970          * Bail out if the shortform directory is way too small.
 971          */
 972         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
 973                 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
 974                 return -EIO;
 975         }
 976         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
 977         ASSERT(dp->i_df.if_u1.if_data != NULL);
 978         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 979         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 980
 981         /*
 982          * New inode number is large, and need to convert to 8-byte inodes.
 983          */
 984         if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
 985                 int     error;                  /* error return value */
 986                 int     newsize;                /* new inode size */
 987
 988                 newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
 989                 /*
 990                  * Won't fit as shortform, convert to block then do replace.
 991                  */
 992                 if (newsize > XFS_IFORK_DSIZE(dp)) {
 993                         error = xfs_dir2_sf_to_block(args);
 994                         if (error) {
 995                                 return error;
 996                         }
 997                         return xfs_dir2_block_replace(args);
 998                 }
 999                 /*
1000                  * Still fits, convert to 8-byte now.
1001                  */
1002                 xfs_dir2_sf_toino8(args);
1003                 i8elevated = 1;
1004                 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1005         } else
1006                 i8elevated = 0;
1007
1008         ASSERT(args->namelen != 1 || args->name[0] != '.');
1009         /*
1010          * Replace ..'s entry.
1011          */
1012         if (args->namelen == 2 &&
1013             args->name[0] == '.' && args->name[1] == '.') {
1014                 ino = dp->d_ops->sf_get_parent_ino(sfp);
1015                 ASSERT(args->inumber != ino);
1016                 dp->d_ops->sf_put_parent_ino(sfp, args->inumber);
1017         }
1018         /*
1019          * Normal entry, look for the name.
1020          */
1021         else {
1022                 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
1023                      i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
1024                         if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1025                                                                 XFS_CMP_EXACT) {
1026                                 ino = dp->d_ops->sf_get_ino(sfp, sfep);
1027                                 ASSERT(args->inumber != ino);
1028                                 dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
1029                                 dp->d_ops->sf_put_ftype(sfep, args->filetype);
1030                                 break;
1031                         }
1032                 }
1033                 /*
1034                  * Didn't find it.
1035                  */
1036                 if (i == sfp->count) {
1037                         ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1038                         if (i8elevated)
1039                                 xfs_dir2_sf_toino4(args);
1040                         return -ENOENT;
1041                 }
1042         }
1043         /*
1044          * See if the old number was large, the new number is small.
1045          */
1046         if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1047             args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1048                 /*
1049                  * And the old count was one, so need to convert to small.
1050                  */
1051                 if (sfp->i8count == 1)
1052                         xfs_dir2_sf_toino4(args);
1053                 else
1054                         sfp->i8count--;
1055         }
1056         /*
1057          * See if the old number was small, the new number is large.
1058          */
1059         if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1060             args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1061                 /*
1062                  * add to the i8count unless we just converted to 8-byte
1063                  * inodes (which does an implied i8count = 1)
1064                  */
1065                 ASSERT(sfp->i8count != 0);
1066                 if (!i8elevated)
1067                         sfp->i8count++;
1068         }
1069         xfs_dir2_sf_check(args);
1070         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1071         return 0;
1072 }
1073
1074 /*
1075  * Convert from 8-byte inode numbers to 4-byte inode numbers.
1076  * The last 8-byte inode number is gone, but the count is still 1.
1077  */
1078 static void
1079 xfs_dir2_sf_toino4(
1080         xfs_da_args_t           *args)          /* operation arguments */
1081 {
1082         char                    *buf;           /* old dir's buffer */
1083         xfs_inode_t             *dp;            /* incore directory inode */
1084         int                     i;              /* entry index */
1085         int                     newsize;        /* new inode size */
1086         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1087         xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
1088         int                     oldsize;        /* old inode size */
1089         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1090         xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
1091
1092         trace_xfs_dir2_sf_toino4(args);
1093
1094         dp = args->dp;
1095
1096         /*
1097          * Copy the old directory to the buffer.
1098          * Then nuke it from the inode, and add the new buffer to the inode.
1099          * Don't want xfs_idata_realloc copying the data here.
1100          */
1101         oldsize = dp->i_df.if_bytes;
1102         buf = kmem_alloc(oldsize, KM_SLEEP);
1103         oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1104         ASSERT(oldsfp->i8count == 1);
1105         memcpy(buf, oldsfp, oldsize);
1106         /*
1107          * Compute the new inode size.
1108          */
1109         newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
1110         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1111         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1112         /*
1113          * Reset our pointers, the data has moved.
1114          */
1115         oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1116         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1117         /*
1118          * Fill in the new header.
1119          */
1120         sfp->count = oldsfp->count;
1121         sfp->i8count = 0;
1122         dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1123         /*
1124          * Copy the entries field by field.
1125          */
1126         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1127                     oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1128              i < sfp->count;
1129              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1130                   oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1131                 sfep->namelen = oldsfep->namelen;
1132                 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1133                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1134                 dp->d_ops->sf_put_ino(sfp, sfep,
1135                                       dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1136                 dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1137         }
1138         /*
1139          * Clean up the inode.
1140          */
1141         kmem_free(buf);
1142         dp->i_d.di_size = newsize;
1143         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1144 }
1145
1146 /*
1147  * Convert existing entries from 4-byte inode numbers to 8-byte inode numbers.
1148  * The new entry w/ an 8-byte inode number is not there yet; we leave with
1149  * i8count set to 1, but no corresponding 8-byte entry.
1150  */
1151 static void
1152 xfs_dir2_sf_toino8(
1153         xfs_da_args_t           *args)          /* operation arguments */
1154 {
1155         char                    *buf;           /* old dir's buffer */
1156         xfs_inode_t             *dp;            /* incore directory inode */
1157         int                     i;              /* entry index */
1158         int                     newsize;        /* new inode size */
1159         xfs_dir2_sf_entry_t     *oldsfep;       /* old sf entry */
1160         xfs_dir2_sf_hdr_t       *oldsfp;        /* old sf directory */
1161         int                     oldsize;        /* old inode size */
1162         xfs_dir2_sf_entry_t     *sfep;          /* new sf entry */
1163         xfs_dir2_sf_hdr_t       *sfp;           /* new sf directory */
1164
1165         trace_xfs_dir2_sf_toino8(args);
1166
1167         dp = args->dp;
1168
1169         /*
1170          * Copy the old directory to the buffer.
1171          * Then nuke it from the inode, and add the new buffer to the inode.
1172          * Don't want xfs_idata_realloc copying the data here.
1173          */
1174         oldsize = dp->i_df.if_bytes;
1175         buf = kmem_alloc(oldsize, KM_SLEEP);
1176         oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1177         ASSERT(oldsfp->i8count == 0);
1178         memcpy(buf, oldsfp, oldsize);
1179         /*
1180          * Compute the new inode size (nb: entry count + 1 for parent)
1181          */
1182         newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
1183         xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1184         xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1185         /*
1186          * Reset our pointers, the data has moved.
1187          */
1188         oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1189         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1190         /*
1191          * Fill in the new header.
1192          */
1193         sfp->count = oldsfp->count;
1194         sfp->i8count = 1;
1195         dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1196         /*
1197          * Copy the entries field by field.
1198          */
1199         for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1200                     oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1201              i < sfp->count;
1202              i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1203                   oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1204                 sfep->namelen = oldsfep->namelen;
1205                 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1206                 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1207                 dp->d_ops->sf_put_ino(sfp, sfep,
1208                                       dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1209                 dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1210         }
1211         /*
1212          * Clean up the inode.
1213          */
1214         kmem_free(buf);
1215         dp->i_d.di_size = newsize;
1216         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1217 }