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   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 /*
  33  * xfs_attr_leaf.c
  34  *
  35  * GROT: figure out how to recover gracefully when bmap returns ENOSPC.
  36  */
  37
  38 #include "xfs.h"
  39
  40 #include "xfs_macros.h"
  41 #include "xfs_types.h"
  42 #include "xfs_inum.h"
  43 #include "xfs_log.h"
  44 #include "xfs_trans.h"
  45 #include "xfs_sb.h"
  46 #include "xfs_ag.h"
  47 #include "xfs_dir.h"
  48 #include "xfs_dir2.h"
  49 #include "xfs_dmapi.h"
  50 #include "xfs_mount.h"
  51 #include "xfs_alloc_btree.h"
  52 #include "xfs_bmap_btree.h"
  53 #include "xfs_ialloc_btree.h"
  54 #include "xfs_alloc.h"
  55 #include "xfs_btree.h"
  56 #include "xfs_attr_sf.h"
  57 #include "xfs_dir_sf.h"
  58 #include "xfs_dir2_sf.h"
  59 #include "xfs_dinode.h"
  60 #include "xfs_inode_item.h"
  61 #include "xfs_inode.h"
  62 #include "xfs_bmap.h"
  63 #include "xfs_da_btree.h"
  64 #include "xfs_attr.h"
  65 #include "xfs_attr_leaf.h"
  66 #include "xfs_error.h"
  67 #include "xfs_bit.h"
  68
  69 /*
  70  * xfs_attr_leaf.c
  71  *
  72  * Routines to implement leaf blocks of attributes as Btrees of hashed names.
  73  */
  74
  75 /*========================================================================
  76  * Function prototypes for the kernel.
  77  *========================================================================*/
  78
  79 /*
  80  * Routines used for growing the Btree.
  81  */
  82 STATIC int xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t which_block,
  83                                     xfs_dabuf_t **bpp);
  84 STATIC int xfs_attr_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args,
  85                                               int freemap_index);
  86 STATIC void xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer);
  87 STATIC void xfs_attr_leaf_rebalance(xfs_da_state_t *state,
  88                                                    xfs_da_state_blk_t *blk1,
  89                                                    xfs_da_state_blk_t *blk2);
  90 STATIC int xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
  91                                            xfs_da_state_blk_t *leaf_blk_1,
  92                                            xfs_da_state_blk_t *leaf_blk_2,
  93                                            int *number_entries_in_blk1,
  94                                            int *number_usedbytes_in_blk1);
  95
  96 /*
  97  * Routines used for shrinking the Btree.
  98  */
  99 STATIC int xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp,
 100                                   xfs_dabuf_t *bp, int level);
 101 STATIC int xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp,
 102                                   xfs_dabuf_t *bp);
 103 STATIC int xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp,
 104                                    xfs_dablk_t blkno, int blkcnt);
 105
 106 /*
 107  * Utility routines.
 108  */
 109 STATIC void xfs_attr_leaf_moveents(xfs_attr_leafblock_t *src_leaf,
 110                                          int src_start,
 111                                          xfs_attr_leafblock_t *dst_leaf,
 112                                          int dst_start, int move_count,
 113                                          xfs_mount_t *mp);
 114 STATIC int xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index);
 115 STATIC int xfs_attr_put_listent(xfs_attr_list_context_t *context,
 116                              attrnames_t *, char *name, int namelen,
 117                              int valuelen);
 118
 119
 120 /*========================================================================
 121  * External routines when dirsize < XFS_LITINO(mp).
 122  *========================================================================*/
 123
 124 /*
 125  * Create the initial contents of a shortform attribute list.
 126  */
 127 int
 128 xfs_attr_shortform_create(xfs_da_args_t *args)
 129 {
 130         xfs_attr_sf_hdr_t *hdr;
 131         xfs_inode_t *dp;
 132         xfs_ifork_t *ifp;
 133
 134         dp = args->dp;
 135         ASSERT(dp != NULL);
 136         ifp = dp->i_afp;
 137         ASSERT(ifp != NULL);
 138         ASSERT(ifp->if_bytes == 0);
 139         if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) {
 140                 ifp->if_flags &= ~XFS_IFEXTENTS;        /* just in case */
 141                 dp->i_d.di_aformat = XFS_DINODE_FMT_LOCAL;
 142                 ifp->if_flags |= XFS_IFINLINE;
 143         } else {
 144                 ASSERT(ifp->if_flags & XFS_IFINLINE);
 145         }
 146         xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK);
 147         hdr = (xfs_attr_sf_hdr_t *)ifp->if_u1.if_data;
 148         hdr->count = 0;
 149         INT_SET(hdr->totsize, ARCH_CONVERT, sizeof(*hdr));
 150         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
 151         return(0);
 152 }
 153
 154 /*
 155  * Add a name/value pair to the shortform attribute list.
 156  * Overflow from the inode has already been checked for.
 157  */
 158 int
 159 xfs_attr_shortform_add(xfs_da_args_t *args)
 160 {
 161         xfs_attr_shortform_t *sf;
 162         xfs_attr_sf_entry_t *sfe;
 163         int i, offset, size;
 164         xfs_inode_t *dp;
 165         xfs_ifork_t *ifp;
 166
 167         dp = args->dp;
 168         ifp = dp->i_afp;
 169         ASSERT(ifp->if_flags & XFS_IFINLINE);
 170         sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
 171         sfe = &sf->list[0];
 172         for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
 173                                 sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
 174                 if (sfe->namelen != args->namelen)
 175                         continue;
 176                 if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
 177                         continue;
 178                 if (((args->flags & ATTR_SECURE) != 0) !=
 179                     ((sfe->flags & XFS_ATTR_SECURE) != 0))
 180                         continue;
 181                 if (((args->flags & ATTR_ROOT) != 0) !=
 182                     ((sfe->flags & XFS_ATTR_ROOT) != 0))
 183                         continue;
 184                 return(XFS_ERROR(EEXIST));
 185         }
 186
 187         offset = (char *)sfe - (char *)sf;
 188         size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
 189         xfs_idata_realloc(dp, size, XFS_ATTR_FORK);
 190         sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
 191         sfe = (xfs_attr_sf_entry_t *)((char *)sf + offset);
 192
 193         sfe->namelen = args->namelen;
 194         INT_SET(sfe->valuelen, ARCH_CONVERT, args->valuelen);
 195         sfe->flags = (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE :
 196                         ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0);
 197         memcpy(sfe->nameval, args->name, args->namelen);
 198         memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen);
 199         INT_MOD(sf->hdr.count, ARCH_CONVERT, 1);
 200         INT_MOD(sf->hdr.totsize, ARCH_CONVERT, size);
 201         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
 202
 203         return(0);
 204 }
 205
 206 /*
 207  * Remove a name from the shortform attribute list structure.
 208  */
 209 int
 210 xfs_attr_shortform_remove(xfs_da_args_t *args)
 211 {
 212         xfs_attr_shortform_t *sf;
 213         xfs_attr_sf_entry_t *sfe;
 214         int base, size=0, end, totsize, i;
 215         xfs_inode_t *dp;
 216
 217         /*
 218          * Remove the attribute.
 219          */
 220         dp = args->dp;
 221         base = sizeof(xfs_attr_sf_hdr_t);
 222         sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
 223         sfe = &sf->list[0];
 224         for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
 225                                 sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
 226                                         base += size, i++) {
 227                 size = XFS_ATTR_SF_ENTSIZE(sfe);
 228                 if (sfe->namelen != args->namelen)
 229                         continue;
 230                 if (memcmp(sfe->nameval, args->name, args->namelen) != 0)
 231                         continue;
 232                 if (((args->flags & ATTR_SECURE) != 0) !=
 233                     ((sfe->flags & XFS_ATTR_SECURE) != 0))
 234                         continue;
 235                 if (((args->flags & ATTR_ROOT) != 0) !=
 236                     ((sfe->flags & XFS_ATTR_ROOT) != 0))
 237                         continue;
 238                 break;
 239         }
 240         if (i == INT_GET(sf->hdr.count, ARCH_CONVERT))
 241                 return(XFS_ERROR(ENOATTR));
 242
 243         end = base + size;
 244         totsize = INT_GET(sf->hdr.totsize, ARCH_CONVERT);
 245         if (end != totsize) {
 246                 memmove(&((char *)sf)[base], &((char *)sf)[end],
 247                                                         totsize - end);
 248         }
 249         INT_MOD(sf->hdr.count, ARCH_CONVERT, -1);
 250         INT_MOD(sf->hdr.totsize, ARCH_CONVERT, -size);
 251         xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
 252         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
 253
 254         return(0);
 255 }
 256
 257 /*
 258  * Look up a name in a shortform attribute list structure.
 259  */
 260 /*ARGSUSED*/
 261 int
 262 xfs_attr_shortform_lookup(xfs_da_args_t *args)
 263 {
 264         xfs_attr_shortform_t *sf;
 265         xfs_attr_sf_entry_t *sfe;
 266         int i;
 267         xfs_ifork_t *ifp;
 268
 269         ifp = args->dp->i_afp;
 270         ASSERT(ifp->if_flags & XFS_IFINLINE);
 271         sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
 272         sfe = &sf->list[0];
 273         for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
 274                                 sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
 275                 if (sfe->namelen != args->namelen)
 276                         continue;
 277                 if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
 278                         continue;
 279                 if (((args->flags & ATTR_SECURE) != 0) !=
 280                     ((sfe->flags & XFS_ATTR_SECURE) != 0))
 281                         continue;
 282                 if (((args->flags & ATTR_ROOT) != 0) !=
 283                     ((sfe->flags & XFS_ATTR_ROOT) != 0))
 284                         continue;
 285                 return(XFS_ERROR(EEXIST));
 286         }
 287         return(XFS_ERROR(ENOATTR));
 288 }
 289
 290 /*
 291  * Look up a name in a shortform attribute list structure.
 292  */
 293 /*ARGSUSED*/
 294 int
 295 xfs_attr_shortform_getvalue(xfs_da_args_t *args)
 296 {
 297         xfs_attr_shortform_t *sf;
 298         xfs_attr_sf_entry_t *sfe;
 299         int i;
 300
 301         ASSERT(args->dp->i_d.di_aformat == XFS_IFINLINE);
 302         sf = (xfs_attr_shortform_t *)args->dp->i_afp->if_u1.if_data;
 303         sfe = &sf->list[0];
 304         for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
 305                                 sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
 306                 if (sfe->namelen != args->namelen)
 307                         continue;
 308                 if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
 309                         continue;
 310                 if (((args->flags & ATTR_SECURE) != 0) !=
 311                     ((sfe->flags & XFS_ATTR_SECURE) != 0))
 312                         continue;
 313                 if (((args->flags & ATTR_ROOT) != 0) !=
 314                     ((sfe->flags & XFS_ATTR_ROOT) != 0))
 315                         continue;
 316                 if (args->flags & ATTR_KERNOVAL) {
 317                         args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
 318                         return(XFS_ERROR(EEXIST));
 319                 }
 320                 if (args->valuelen < INT_GET(sfe->valuelen, ARCH_CONVERT)) {
 321                         args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
 322                         return(XFS_ERROR(ERANGE));
 323                 }
 324                 args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
 325                 memcpy(args->value, &sfe->nameval[args->namelen],
 326                                                     args->valuelen);
 327                 return(XFS_ERROR(EEXIST));
 328         }
 329         return(XFS_ERROR(ENOATTR));
 330 }
 331
 332 /*
 333  * Convert from using the shortform to the leaf.
 334  */
 335 int
 336 xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
 337 {
 338         xfs_inode_t *dp;
 339         xfs_attr_shortform_t *sf;
 340         xfs_attr_sf_entry_t *sfe;
 341         xfs_da_args_t nargs;
 342         char *tmpbuffer;
 343         int error, i, size;
 344         xfs_dablk_t blkno;
 345         xfs_dabuf_t *bp;
 346         xfs_ifork_t *ifp;
 347
 348         dp = args->dp;
 349         ifp = dp->i_afp;
 350         sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
 351         size = INT_GET(sf->hdr.totsize, ARCH_CONVERT);
 352         tmpbuffer = kmem_alloc(size, KM_SLEEP);
 353         ASSERT(tmpbuffer != NULL);
 354         memcpy(tmpbuffer, ifp->if_u1.if_data, size);
 355         sf = (xfs_attr_shortform_t *)tmpbuffer;
 356
 357         xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
 358         bp = NULL;
 359         error = xfs_da_grow_inode(args, &blkno);
 360         if (error) {
 361                 /*
 362                  * If we hit an IO error middle of the transaction inside
 363                  * grow_inode(), we may have inconsistent data. Bail out.
 364                  */
 365                 if (error == EIO)
 366                         goto out;
 367                 xfs_idata_realloc(dp, size, XFS_ATTR_FORK);     /* try to put */
 368                 memcpy(ifp->if_u1.if_data, tmpbuffer, size);    /* it back */
 369                 goto out;
 370         }
 371
 372         ASSERT(blkno == 0);
 373         error = xfs_attr_leaf_create(args, blkno, &bp);
 374         if (error) {
 375                 error = xfs_da_shrink_inode(args, 0, bp);
 376                 bp = NULL;
 377                 if (error)
 378                         goto out;
 379                 xfs_idata_realloc(dp, size, XFS_ATTR_FORK);     /* try to put */
 380                 memcpy(ifp->if_u1.if_data, tmpbuffer, size);    /* it back */
 381                 goto out;
 382         }
 383
 384         memset((char *)&nargs, 0, sizeof(nargs));
 385         nargs.dp = dp;
 386         nargs.firstblock = args->firstblock;
 387         nargs.flist = args->flist;
 388         nargs.total = args->total;
 389         nargs.whichfork = XFS_ATTR_FORK;
 390         nargs.trans = args->trans;
 391         nargs.oknoent = 1;
 392
 393         sfe = &sf->list[0];
 394         for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
 395                 nargs.name = (char *)sfe->nameval;
 396                 nargs.namelen = sfe->namelen;
 397                 nargs.value = (char *)&sfe->nameval[nargs.namelen];
 398                 nargs.valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
 399                 nargs.hashval = xfs_da_hashname((char *)sfe->nameval,
 400                                                 sfe->namelen);
 401                 nargs.flags = (sfe->flags & XFS_ATTR_SECURE) ? ATTR_SECURE :
 402                                 ((sfe->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0);
 403                 error = xfs_attr_leaf_lookup_int(bp, &nargs); /* set a->index */
 404                 ASSERT(error == ENOATTR);
 405                 error = xfs_attr_leaf_add(bp, &nargs);
 406                 ASSERT(error != ENOSPC);
 407                 if (error)
 408                         goto out;
 409                 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
 410         }
 411         error = 0;
 412
 413 out:
 414         if(bp)
 415                 xfs_da_buf_done(bp);
 416         kmem_free(tmpbuffer, size);
 417         return(error);
 418 }
 419
 420 STATIC int
 421 xfs_attr_shortform_compare(const void *a, const void *b)
 422 {
 423         xfs_attr_sf_sort_t *sa, *sb;
 424
 425         sa = (xfs_attr_sf_sort_t *)a;
 426         sb = (xfs_attr_sf_sort_t *)b;
 427         if (INT_GET(sa->hash, ARCH_CONVERT)
 428                                 < INT_GET(sb->hash, ARCH_CONVERT)) {
 429                 return(-1);
 430         } else if (INT_GET(sa->hash, ARCH_CONVERT)
 431                                 > INT_GET(sb->hash, ARCH_CONVERT)) {
 432                 return(1);
 433         } else {
 434                 return(sa->entno - sb->entno);
 435         }
 436 }
 437
 438 /*
 439  * Copy out entries of shortform attribute lists for attr_list().
 440  * Shortform atrtribute lists are not stored in hashval sorted order.
 441  * If the output buffer is not large enough to hold them all, then we
 442  * we have to calculate each entries' hashvalue and sort them before
 443  * we can begin returning them to the user.
 444  */
 445 /*ARGSUSED*/
 446 int
 447 xfs_attr_shortform_list(xfs_attr_list_context_t *context)
 448 {
 449         attrlist_cursor_kern_t *cursor;
 450         xfs_attr_sf_sort_t *sbuf, *sbp;
 451         xfs_attr_shortform_t *sf;
 452         xfs_attr_sf_entry_t *sfe;
 453         xfs_inode_t *dp;
 454         int sbsize, nsbuf, count, i;
 455
 456         ASSERT(context != NULL);
 457         dp = context->dp;
 458         ASSERT(dp != NULL);
 459         ASSERT(dp->i_afp != NULL);
 460         sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
 461         ASSERT(sf != NULL);
 462         if (!sf->hdr.count)
 463                 return(0);
 464         cursor = context->cursor;
 465         ASSERT(cursor != NULL);
 466
 467         xfs_attr_trace_l_c("sf start", context);
 468
 469         /*
 470          * If the buffer is large enough, do not bother with sorting.
 471          * Note the generous fudge factor of 16 overhead bytes per entry.
 472          */
 473         if ((dp->i_afp->if_bytes + INT_GET(sf->hdr.count, ARCH_CONVERT) * 16)
 474                                                         < context->bufsize) {
 475                 for (i = 0, sfe = &sf->list[0];
 476                                 i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
 477                         attrnames_t     *namesp;
 478
 479                         if (((context->flags & ATTR_SECURE) != 0) !=
 480                             ((sfe->flags & XFS_ATTR_SECURE) != 0) &&
 481                             !(context->flags & ATTR_KERNORMALS)) {
 482                                 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
 483                                 continue;
 484                         }
 485                         if (((context->flags & ATTR_ROOT) != 0) !=
 486                             ((sfe->flags & XFS_ATTR_ROOT) != 0) &&
 487                             !(context->flags & ATTR_KERNROOTLS)) {
 488                                 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
 489                                 continue;
 490                         }
 491                         namesp = (sfe->flags & XFS_ATTR_SECURE) ? &attr_secure:
 492                                 ((sfe->flags & XFS_ATTR_ROOT) ? &attr_trusted :
 493                                   &attr_user);
 494                         if (context->flags & ATTR_KERNOVAL) {
 495                                 ASSERT(context->flags & ATTR_KERNAMELS);
 496                                 context->count += namesp->attr_namelen +
 497                                         INT_GET(sfe->namelen, ARCH_CONVERT) + 1;
 498                         }
 499                         else {
 500                                 if (xfs_attr_put_listent(context, namesp,
 501                                                    (char *)sfe->nameval,
 502                                                    (int)sfe->namelen,
 503                                                    (int)INT_GET(sfe->valuelen,
 504                                                                 ARCH_CONVERT)))
 505                                         break;
 506                         }
 507                         sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
 508                 }
 509                 xfs_attr_trace_l_c("sf big-gulp", context);
 510                 return(0);
 511         }
 512
 513         /*
 514          * It didn't all fit, so we have to sort everything on hashval.
 515          */
 516         sbsize = INT_GET(sf->hdr.count, ARCH_CONVERT) * sizeof(*sbuf);
 517         sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP);
 518
 519         /*
 520          * Scan the attribute list for the rest of the entries, storing
 521          * the relevant info from only those that match into a buffer.
 522          */
 523         nsbuf = 0;
 524         for (i = 0, sfe = &sf->list[0];
 525                         i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
 526                 if (unlikely(
 527                     ((char *)sfe < (char *)sf) ||
 528                     ((char *)sfe >= ((char *)sf + dp->i_afp->if_bytes)))) {
 529                         XFS_CORRUPTION_ERROR("xfs_attr_shortform_list",
 530                                              XFS_ERRLEVEL_LOW,
 531                                              context->dp->i_mount, sfe);
 532                         xfs_attr_trace_l_c("sf corrupted", context);
 533                         kmem_free(sbuf, sbsize);
 534                         return XFS_ERROR(EFSCORRUPTED);
 535                 }
 536                 if (((context->flags & ATTR_SECURE) != 0) !=
 537                     ((sfe->flags & XFS_ATTR_SECURE) != 0) &&
 538                     !(context->flags & ATTR_KERNORMALS)) {
 539                         sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
 540                         continue;
 541                 }
 542                 if (((context->flags & ATTR_ROOT) != 0) !=
 543                     ((sfe->flags & XFS_ATTR_ROOT) != 0) &&
 544                     !(context->flags & ATTR_KERNROOTLS)) {
 545                         sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
 546                         continue;
 547                 }
 548                 sbp->entno = i;
 549                 INT_SET(sbp->hash, ARCH_CONVERT,
 550                         xfs_da_hashname((char *)sfe->nameval, sfe->namelen));
 551                 sbp->name = (char *)sfe->nameval;
 552                 sbp->namelen = sfe->namelen;
 553                 /* These are bytes, and both on-disk, don't endian-flip */
 554                 sbp->valuelen = sfe->valuelen;
 555                 sbp->flags = sfe->flags;
 556                 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
 557                 sbp++;
 558                 nsbuf++;
 559         }
 560
 561         /*
 562          * Sort the entries on hash then entno.
 563          */
 564         qsort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare);
 565
 566         /*
 567          * Re-find our place IN THE SORTED LIST.
 568          */
 569         count = 0;
 570         cursor->initted = 1;
 571         cursor->blkno = 0;
 572         for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) {
 573                 if (INT_GET(sbp->hash, ARCH_CONVERT) == cursor->hashval) {
 574                         if (cursor->offset == count) {
 575                                 break;
 576                         }
 577                         count++;
 578                 } else if (INT_GET(sbp->hash, ARCH_CONVERT) > cursor->hashval) {
 579                         break;
 580                 }
 581         }
 582         if (i == nsbuf) {
 583                 kmem_free(sbuf, sbsize);
 584                 xfs_attr_trace_l_c("blk end", context);
 585                 return(0);
 586         }
 587
 588         /*
 589          * Loop putting entries into the user buffer.
 590          */
 591         for ( ; i < nsbuf; i++, sbp++) {
 592                 attrnames_t     *namesp;
 593
 594                 namesp = (sbp->flags & XFS_ATTR_SECURE) ? &attr_secure :
 595                         ((sbp->flags & XFS_ATTR_ROOT) ? &attr_trusted :
 596                           &attr_user);
 597
 598                 if (cursor->hashval != INT_GET(sbp->hash, ARCH_CONVERT)) {
 599                         cursor->hashval = INT_GET(sbp->hash, ARCH_CONVERT);
 600                         cursor->offset = 0;
 601                 }
 602                 if (context->flags & ATTR_KERNOVAL) {
 603                         ASSERT(context->flags & ATTR_KERNAMELS);
 604                         context->count += namesp->attr_namelen +
 605                                                 sbp->namelen + 1;
 606                 } else {
 607                         if (xfs_attr_put_listent(context, namesp,
 608                                         sbp->name, sbp->namelen,
 609                                         INT_GET(sbp->valuelen, ARCH_CONVERT)))
 610                                 break;
 611                 }
 612                 cursor->offset++;
 613         }
 614
 615         kmem_free(sbuf, sbsize);
 616         xfs_attr_trace_l_c("sf E-O-F", context);
 617         return(0);
 618 }
 619
 620 /*
 621  * Check a leaf attribute block to see if all the entries would fit into
 622  * a shortform attribute list.
 623  */
 624 int
 625 xfs_attr_shortform_allfit(xfs_dabuf_t *bp, xfs_inode_t *dp)
 626 {
 627         xfs_attr_leafblock_t *leaf;
 628         xfs_attr_leaf_entry_t *entry;
 629         xfs_attr_leaf_name_local_t *name_loc;
 630         int bytes, i;
 631
 632         leaf = bp->data;
 633         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
 634                                                 == XFS_ATTR_LEAF_MAGIC);
 635
 636         entry = &leaf->entries[0];
 637         bytes = sizeof(struct xfs_attr_sf_hdr);
 638         for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
 639                 if (entry->flags & XFS_ATTR_INCOMPLETE)
 640                         continue;               /* don't copy partial entries */
 641                 if (!(entry->flags & XFS_ATTR_LOCAL))
 642                         return(0);
 643                 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
 644                 if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX)
 645                         return(0);
 646                 if (INT_GET(name_loc->valuelen, ARCH_CONVERT) >= XFS_ATTR_SF_ENTSIZE_MAX)
 647                         return(0);
 648                 bytes += sizeof(struct xfs_attr_sf_entry)-1
 649                                 + name_loc->namelen
 650                                 + INT_GET(name_loc->valuelen, ARCH_CONVERT);
 651         }
 652         return( bytes < XFS_IFORK_ASIZE(dp) );
 653 }
 654
 655 /*
 656  * Convert a leaf attribute list to shortform attribute list
 657  */
 658 int
 659 xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args)
 660 {
 661         xfs_attr_leafblock_t *leaf;
 662         xfs_attr_leaf_entry_t *entry;
 663         xfs_attr_leaf_name_local_t *name_loc;
 664         xfs_da_args_t nargs;
 665         xfs_inode_t *dp;
 666         char *tmpbuffer;
 667         int error, i;
 668
 669         dp = args->dp;
 670         tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP);
 671         ASSERT(tmpbuffer != NULL);
 672
 673         ASSERT(bp != NULL);
 674         memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount));
 675         leaf = (xfs_attr_leafblock_t *)tmpbuffer;
 676         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
 677                                                 == XFS_ATTR_LEAF_MAGIC);
 678         memset(bp->data, 0, XFS_LBSIZE(dp->i_mount));
 679
 680         /*
 681          * Clean out the prior contents of the attribute list.
 682          */
 683         error = xfs_da_shrink_inode(args, 0, bp);
 684         if (error)
 685                 goto out;
 686         error = xfs_attr_shortform_create(args);
 687         if (error)
 688                 goto out;
 689
 690         /*
 691          * Copy the attributes
 692          */
 693         memset((char *)&nargs, 0, sizeof(nargs));
 694         nargs.dp = dp;
 695         nargs.firstblock = args->firstblock;
 696         nargs.flist = args->flist;
 697         nargs.total = args->total;
 698         nargs.whichfork = XFS_ATTR_FORK;
 699         nargs.trans = args->trans;
 700         nargs.oknoent = 1;
 701         entry = &leaf->entries[0];
 702         for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
 703                 if (entry->flags & XFS_ATTR_INCOMPLETE)
 704                         continue;       /* don't copy partial entries */
 705                 if (!entry->nameidx)
 706                         continue;
 707                 ASSERT(entry->flags & XFS_ATTR_LOCAL);
 708                 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
 709                 nargs.name = (char *)name_loc->nameval;
 710                 nargs.namelen = name_loc->namelen;
 711                 nargs.value = (char *)&name_loc->nameval[nargs.namelen];
 712                 nargs.valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT);
 713                 nargs.hashval = INT_GET(entry->hashval, ARCH_CONVERT);
 714                 nargs.flags = (entry->flags & XFS_ATTR_SECURE) ? ATTR_SECURE :
 715                               ((entry->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0);
 716                 xfs_attr_shortform_add(&nargs);
 717         }
 718         error = 0;
 719
 720 out:
 721         kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount));
 722         return(error);
 723 }
 724
 725 /*
 726  * Convert from using a single leaf to a root node and a leaf.
 727  */
 728 int
 729 xfs_attr_leaf_to_node(xfs_da_args_t *args)
 730 {
 731         xfs_attr_leafblock_t *leaf;
 732         xfs_da_intnode_t *node;
 733         xfs_inode_t *dp;
 734         xfs_dabuf_t *bp1, *bp2;
 735         xfs_dablk_t blkno;
 736         int error;
 737
 738         dp = args->dp;
 739         bp1 = bp2 = NULL;
 740         error = xfs_da_grow_inode(args, &blkno);
 741         if (error)
 742                 goto out;
 743         error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1,
 744                                              XFS_ATTR_FORK);
 745         if (error)
 746                 goto out;
 747         ASSERT(bp1 != NULL);
 748         bp2 = NULL;
 749         error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp2,
 750                                             XFS_ATTR_FORK);
 751         if (error)
 752                 goto out;
 753         ASSERT(bp2 != NULL);
 754         memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount));
 755         xfs_da_buf_done(bp1);
 756         bp1 = NULL;
 757         xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1);
 758
 759         /*
 760          * Set up the new root node.
 761          */
 762         error = xfs_da_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK);
 763         if (error)
 764                 goto out;
 765         node = bp1->data;
 766         leaf = bp2->data;
 767         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
 768                                                 == XFS_ATTR_LEAF_MAGIC);
 769         /* both on-disk, don't endian-flip twice */
 770         node->btree[0].hashval =
 771                 leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval;
 772         INT_SET(node->btree[0].before, ARCH_CONVERT, blkno);
 773         INT_SET(node->hdr.count, ARCH_CONVERT, 1);
 774         xfs_da_log_buf(args->trans, bp1, 0, XFS_LBSIZE(dp->i_mount) - 1);
 775         error = 0;
 776 out:
 777         if (bp1)
 778                 xfs_da_buf_done(bp1);
 779         if (bp2)
 780                 xfs_da_buf_done(bp2);
 781         return(error);
 782 }
 783
 784
 785 /*========================================================================
 786  * Routines used for growing the Btree.
 787  *========================================================================*/
 788
 789 /*
 790  * Create the initial contents of a leaf attribute list
 791  * or a leaf in a node attribute list.
 792  */
 793 STATIC int
 794 xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp)
 795 {
 796         xfs_attr_leafblock_t *leaf;
 797         xfs_attr_leaf_hdr_t *hdr;
 798         xfs_inode_t *dp;
 799         xfs_dabuf_t *bp;
 800         int error;
 801
 802         dp = args->dp;
 803         ASSERT(dp != NULL);
 804         error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp,
 805                                             XFS_ATTR_FORK);
 806         if (error)
 807                 return(error);
 808         ASSERT(bp != NULL);
 809         leaf = bp->data;
 810         memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount));
 811         hdr = &leaf->hdr;
 812         INT_SET(hdr->info.magic, ARCH_CONVERT, XFS_ATTR_LEAF_MAGIC);
 813         INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount));
 814         if (!hdr->firstused) {
 815                 INT_SET(hdr->firstused, ARCH_CONVERT,
 816                         XFS_LBSIZE(dp->i_mount) - XFS_ATTR_LEAF_NAME_ALIGN);
 817         }
 818
 819         INT_SET(hdr->freemap[0].base, ARCH_CONVERT,
 820                                                 sizeof(xfs_attr_leaf_hdr_t));
 821         INT_SET(hdr->freemap[0].size, ARCH_CONVERT,
 822                                           INT_GET(hdr->firstused, ARCH_CONVERT)
 823                                         - INT_GET(hdr->freemap[0].base,
 824                                                                 ARCH_CONVERT));
 825
 826         xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1);
 827
 828         *bpp = bp;
 829         return(0);
 830 }
 831
 832 /*
 833  * Split the leaf node, rebalance, then add the new entry.
 834  */
 835 int
 836 xfs_attr_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
 837                                    xfs_da_state_blk_t *newblk)
 838 {
 839         xfs_dablk_t blkno;
 840         int error;
 841
 842         /*
 843          * Allocate space for a new leaf node.
 844          */
 845         ASSERT(oldblk->magic == XFS_ATTR_LEAF_MAGIC);
 846         error = xfs_da_grow_inode(state->args, &blkno);
 847         if (error)
 848                 return(error);
 849         error = xfs_attr_leaf_create(state->args, blkno, &newblk->bp);
 850         if (error)
 851                 return(error);
 852         newblk->blkno = blkno;
 853         newblk->magic = XFS_ATTR_LEAF_MAGIC;
 854
 855         /*
 856          * Rebalance the entries across the two leaves.
 857          * NOTE: rebalance() currently depends on the 2nd block being empty.
 858          */
 859         xfs_attr_leaf_rebalance(state, oldblk, newblk);
 860         error = xfs_da_blk_link(state, oldblk, newblk);
 861         if (error)
 862                 return(error);
 863
 864         /*
 865          * Save info on "old" attribute for "atomic rename" ops, leaf_add()
 866          * modifies the index/blkno/rmtblk/rmtblkcnt fields to show the
 867          * "new" attrs info.  Will need the "old" info to remove it later.
 868          *
 869          * Insert the "new" entry in the correct block.
 870          */
 871         if (state->inleaf)
 872                 error = xfs_attr_leaf_add(oldblk->bp, state->args);
 873         else
 874                 error = xfs_attr_leaf_add(newblk->bp, state->args);
 875
 876         /*
 877          * Update last hashval in each block since we added the name.
 878          */
 879         oldblk->hashval = xfs_attr_leaf_lasthash(oldblk->bp, NULL);
 880         newblk->hashval = xfs_attr_leaf_lasthash(newblk->bp, NULL);
 881         return(error);
 882 }
 883
 884 /*
 885  * Add a name to the leaf attribute list structure.
 886  */
 887 int
 888 xfs_attr_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args)
 889 {
 890         xfs_attr_leafblock_t *leaf;
 891         xfs_attr_leaf_hdr_t *hdr;
 892         xfs_attr_leaf_map_t *map;
 893         int tablesize, entsize, sum, tmp, i;
 894
 895         leaf = bp->data;
 896         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
 897                                                 == XFS_ATTR_LEAF_MAGIC);
 898         ASSERT((args->index >= 0)
 899                 && (args->index <= INT_GET(leaf->hdr.count, ARCH_CONVERT)));
 900         hdr = &leaf->hdr;
 901         entsize = xfs_attr_leaf_newentsize(args,
 902                            args->trans->t_mountp->m_sb.sb_blocksize, NULL);
 903
 904         /*
 905          * Search through freemap for first-fit on new name length.
 906          * (may need to figure in size of entry struct too)
 907          */
 908         tablesize = (INT_GET(hdr->count, ARCH_CONVERT) + 1)
 909                                         * sizeof(xfs_attr_leaf_entry_t)
 910                                         + sizeof(xfs_attr_leaf_hdr_t);
 911         map = &hdr->freemap[XFS_ATTR_LEAF_MAPSIZE-1];
 912         for (sum = 0, i = XFS_ATTR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {
 913                 if (tablesize > INT_GET(hdr->firstused, ARCH_CONVERT)) {
 914                         sum += INT_GET(map->size, ARCH_CONVERT);
 915                         continue;
 916                 }
 917                 if (!map->size)
 918                         continue;       /* no space in this map */
 919                 tmp = entsize;
 920                 if (INT_GET(map->base, ARCH_CONVERT)
 921                                 < INT_GET(hdr->firstused, ARCH_CONVERT))
 922                         tmp += sizeof(xfs_attr_leaf_entry_t);
 923                 if (INT_GET(map->size, ARCH_CONVERT) >= tmp) {
 924                         tmp = xfs_attr_leaf_add_work(bp, args, i);
 925                         return(tmp);
 926                 }
 927                 sum += INT_GET(map->size, ARCH_CONVERT);
 928         }
 929
 930         /*
 931          * If there are no holes in the address space of the block,
 932          * and we don't have enough freespace, then compaction will do us
 933          * no good and we should just give up.
 934          */
 935         if (!hdr->holes && (sum < entsize))
 936                 return(XFS_ERROR(ENOSPC));
 937
 938         /*
 939          * Compact the entries to coalesce free space.
 940          * This may change the hdr->count via dropping INCOMPLETE entries.
 941          */
 942         xfs_attr_leaf_compact(args->trans, bp);
 943
 944         /*
 945          * After compaction, the block is guaranteed to have only one
 946          * free region, in freemap[0].  If it is not big enough, give up.
 947          */
 948         if (INT_GET(hdr->freemap[0].size, ARCH_CONVERT)
 949                                 < (entsize + sizeof(xfs_attr_leaf_entry_t)))
 950                 return(XFS_ERROR(ENOSPC));
 951
 952         return(xfs_attr_leaf_add_work(bp, args, 0));
 953 }
 954
 955 /*
 956  * Add a name to a leaf attribute list structure.
 957  */
 958 STATIC int
 959 xfs_attr_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int mapindex)
 960 {
 961         xfs_attr_leafblock_t *leaf;
 962         xfs_attr_leaf_hdr_t *hdr;
 963         xfs_attr_leaf_entry_t *entry;
 964         xfs_attr_leaf_name_local_t *name_loc;
 965         xfs_attr_leaf_name_remote_t *name_rmt;
 966         xfs_attr_leaf_map_t *map;
 967         xfs_mount_t *mp;
 968         int tmp, i;
 969
 970         leaf = bp->data;
 971         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
 972                                                 == XFS_ATTR_LEAF_MAGIC);
 973         hdr = &leaf->hdr;
 974         ASSERT((mapindex >= 0) && (mapindex < XFS_ATTR_LEAF_MAPSIZE));
 975         ASSERT((args->index >= 0)
 976                 && (args->index <= INT_GET(hdr->count, ARCH_CONVERT)));
 977
 978         /*
 979          * Force open some space in the entry array and fill it in.
 980          */
 981         entry = &leaf->entries[args->index];
 982         if (args->index < INT_GET(hdr->count, ARCH_CONVERT)) {
 983                 tmp  = INT_GET(hdr->count, ARCH_CONVERT) - args->index;
 984                 tmp *= sizeof(xfs_attr_leaf_entry_t);
 985                 memmove((char *)(entry+1), (char *)entry, tmp);
 986                 xfs_da_log_buf(args->trans, bp,
 987                     XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
 988         }
 989         INT_MOD(hdr->count, ARCH_CONVERT, 1);
 990
 991         /*
 992          * Allocate space for the new string (at the end of the run).
 993          */
 994         map = &hdr->freemap[mapindex];
 995         mp = args->trans->t_mountp;
 996         ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
 997         ASSERT((INT_GET(map->base, ARCH_CONVERT) & 0x3) == 0);
 998         ASSERT(INT_GET(map->size, ARCH_CONVERT)
 999                                 >= xfs_attr_leaf_newentsize(args,
1000                                              mp->m_sb.sb_blocksize, NULL));
1001         ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
1002         ASSERT((INT_GET(map->size, ARCH_CONVERT) & 0x3) == 0);
1003         INT_MOD(map->size, ARCH_CONVERT,
1004                 -xfs_attr_leaf_newentsize(args, mp->m_sb.sb_blocksize, &tmp));
1005         INT_SET(entry->nameidx, ARCH_CONVERT,
1006                                         INT_GET(map->base, ARCH_CONVERT)
1007                                       + INT_GET(map->size, ARCH_CONVERT));
1008         INT_SET(entry->hashval, ARCH_CONVERT, args->hashval);
1009         entry->flags = tmp ? XFS_ATTR_LOCAL : 0;
1010         entry->flags |= (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE :
1011                         ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0);
1012         if (args->rename) {
1013                 entry->flags |= XFS_ATTR_INCOMPLETE;
1014                 if ((args->blkno2 == args->blkno) &&
1015                     (args->index2 <= args->index)) {
1016                         args->index2++;
1017                 }
1018         }
1019         xfs_da_log_buf(args->trans, bp,
1020                           XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
1021         ASSERT((args->index == 0) || (INT_GET(entry->hashval, ARCH_CONVERT)
1022                                                 >= INT_GET((entry-1)->hashval,
1023                                                             ARCH_CONVERT)));
1024         ASSERT((args->index == INT_GET(hdr->count, ARCH_CONVERT)-1) ||
1025                (INT_GET(entry->hashval, ARCH_CONVERT)
1026                             <= (INT_GET((entry+1)->hashval, ARCH_CONVERT))));
1027
1028         /*
1029          * Copy the attribute name and value into the new space.
1030          *
1031          * For "remote" attribute values, simply note that we need to
1032          * allocate space for the "remote" value.  We can't actually
1033          * allocate the extents in this transaction, and we can't decide
1034          * which blocks they should be as we might allocate more blocks
1035          * as part of this transaction (a split operation for example).
1036          */
1037         if (entry->flags & XFS_ATTR_LOCAL) {
1038                 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
1039                 name_loc->namelen = args->namelen;
1040                 INT_SET(name_loc->valuelen, ARCH_CONVERT, args->valuelen);
1041                 memcpy((char *)name_loc->nameval, args->name, args->namelen);
1042                 memcpy((char *)&name_loc->nameval[args->namelen], args->value,
1043                                    INT_GET(name_loc->valuelen, ARCH_CONVERT));
1044         } else {
1045                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
1046                 name_rmt->namelen = args->namelen;
1047                 memcpy((char *)name_rmt->name, args->name, args->namelen);
1048                 entry->flags |= XFS_ATTR_INCOMPLETE;
1049                 /* just in case */
1050                 name_rmt->valuelen = 0;
1051                 name_rmt->valueblk = 0;
1052                 args->rmtblkno = 1;
1053                 args->rmtblkcnt = XFS_B_TO_FSB(mp, args->valuelen);
1054         }
1055         xfs_da_log_buf(args->trans, bp,
1056              XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
1057                                    xfs_attr_leaf_entsize(leaf, args->index)));
1058
1059         /*
1060          * Update the control info for this leaf node
1061          */
1062         if (INT_GET(entry->nameidx, ARCH_CONVERT)
1063                                 < INT_GET(hdr->firstused, ARCH_CONVERT)) {
1064                 /* both on-disk, don't endian-flip twice */
1065                 hdr->firstused = entry->nameidx;
1066         }
1067         ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT)
1068                                 >= ((INT_GET(hdr->count, ARCH_CONVERT)
1069                                         * sizeof(*entry))+sizeof(*hdr)));
1070         tmp = (INT_GET(hdr->count, ARCH_CONVERT)-1)
1071                                         * sizeof(xfs_attr_leaf_entry_t)
1072                                         + sizeof(xfs_attr_leaf_hdr_t);
1073         map = &hdr->freemap[0];
1074         for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
1075                 if (INT_GET(map->base, ARCH_CONVERT) == tmp) {
1076                         INT_MOD(map->base, ARCH_CONVERT,
1077                                         sizeof(xfs_attr_leaf_entry_t));
1078                         INT_MOD(map->size, ARCH_CONVERT,
1079                                         -sizeof(xfs_attr_leaf_entry_t));
1080                 }
1081         }
1082         INT_MOD(hdr->usedbytes, ARCH_CONVERT,
1083                                 xfs_attr_leaf_entsize(leaf, args->index));
1084         xfs_da_log_buf(args->trans, bp,
1085                 XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
1086         return(0);
1087 }
1088
1089 /*
1090  * Garbage collect a leaf attribute list block by copying it to a new buffer.
1091  */
1092 STATIC void
1093 xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp)
1094 {
1095         xfs_attr_leafblock_t *leaf_s, *leaf_d;
1096         xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
1097         xfs_mount_t *mp;
1098         char *tmpbuffer;
1099
1100         mp = trans->t_mountp;
1101         tmpbuffer = kmem_alloc(XFS_LBSIZE(mp), KM_SLEEP);
1102         ASSERT(tmpbuffer != NULL);
1103         memcpy(tmpbuffer, bp->data, XFS_LBSIZE(mp));
1104         memset(bp->data, 0, XFS_LBSIZE(mp));
1105
1106         /*
1107          * Copy basic information
1108          */
1109         leaf_s = (xfs_attr_leafblock_t *)tmpbuffer;
1110         leaf_d = bp->data;
1111         hdr_s = &leaf_s->hdr;
1112         hdr_d = &leaf_d->hdr;
1113         hdr_d->info = hdr_s->info;      /* struct copy */
1114         INT_SET(hdr_d->firstused, ARCH_CONVERT, XFS_LBSIZE(mp));
1115         /* handle truncation gracefully */
1116         if (!hdr_d->firstused) {
1117                 INT_SET(hdr_d->firstused, ARCH_CONVERT,
1118                                 XFS_LBSIZE(mp) - XFS_ATTR_LEAF_NAME_ALIGN);
1119         }
1120         hdr_d->usedbytes = 0;
1121         hdr_d->count = 0;
1122         hdr_d->holes = 0;
1123         INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT,
1124                                         sizeof(xfs_attr_leaf_hdr_t));
1125         INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT,
1126                                 INT_GET(hdr_d->firstused, ARCH_CONVERT)
1127                               - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
1128
1129         /*
1130          * Copy all entry's in the same (sorted) order,
1131          * but allocate name/value pairs packed and in sequence.
1132          */
1133         xfs_attr_leaf_moveents(leaf_s, 0, leaf_d, 0,
1134                                 (int)INT_GET(hdr_s->count, ARCH_CONVERT), mp);
1135
1136         xfs_da_log_buf(trans, bp, 0, XFS_LBSIZE(mp) - 1);
1137
1138         kmem_free(tmpbuffer, XFS_LBSIZE(mp));
1139 }
1140
1141 /*
1142  * Redistribute the attribute list entries between two leaf nodes,
1143  * taking into account the size of the new entry.
1144  *
1145  * NOTE: if new block is empty, then it will get the upper half of the
1146  * old block.  At present, all (one) callers pass in an empty second block.
1147  *
1148  * This code adjusts the args->index/blkno and args->index2/blkno2 fields
1149  * to match what it is doing in splitting the attribute leaf block.  Those
1150  * values are used in "atomic rename" operations on attributes.  Note that
1151  * the "new" and "old" values can end up in different blocks.
1152  */
1153 STATIC void
1154 xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
1155                                        xfs_da_state_blk_t *blk2)
1156 {
1157         xfs_da_args_t *args;
1158         xfs_da_state_blk_t *tmp_blk;
1159         xfs_attr_leafblock_t *leaf1, *leaf2;
1160         xfs_attr_leaf_hdr_t *hdr1, *hdr2;
1161         int count, totallen, max, space, swap;
1162
1163         /*
1164          * Set up environment.
1165          */
1166         ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC);
1167         ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC);
1168         leaf1 = blk1->bp->data;
1169         leaf2 = blk2->bp->data;
1170         ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT)
1171                                                 == XFS_ATTR_LEAF_MAGIC);
1172         ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
1173                                                 == XFS_ATTR_LEAF_MAGIC);
1174         args = state->args;
1175
1176         /*
1177          * Check ordering of blocks, reverse if it makes things simpler.
1178          *
1179          * NOTE: Given that all (current) callers pass in an empty
1180          * second block, this code should never set "swap".
1181          */
1182         swap = 0;
1183         if (xfs_attr_leaf_order(blk1->bp, blk2->bp)) {
1184                 tmp_blk = blk1;
1185                 blk1 = blk2;
1186                 blk2 = tmp_blk;
1187                 leaf1 = blk1->bp->data;
1188                 leaf2 = blk2->bp->data;
1189                 swap = 1;
1190         }
1191         hdr1 = &leaf1->hdr;
1192         hdr2 = &leaf2->hdr;
1193
1194         /*
1195          * Examine entries until we reduce the absolute difference in
1196          * byte usage between the two blocks to a minimum.  Then get
1197          * the direction to copy and the number of elements to move.
1198          *
1199          * "inleaf" is true if the new entry should be inserted into blk1.
1200          * If "swap" is also true, then reverse the sense of "inleaf".
1201          */
1202         state->inleaf = xfs_attr_leaf_figure_balance(state, blk1, blk2,
1203                                                             &count, &totallen);
1204         if (swap)
1205                 state->inleaf = !state->inleaf;
1206
1207         /*
1208          * Move any entries required from leaf to leaf:
1209          */
1210         if (count < INT_GET(hdr1->count, ARCH_CONVERT)) {
1211                 /*
1212                  * Figure the total bytes to be added to the destination leaf.
1213                  */
1214                 /* number entries being moved */
1215                 count = INT_GET(hdr1->count, ARCH_CONVERT) - count;
1216                 space  = INT_GET(hdr1->usedbytes, ARCH_CONVERT) - totallen;
1217                 space += count * sizeof(xfs_attr_leaf_entry_t);
1218
1219                 /*
1220                  * leaf2 is the destination, compact it if it looks tight.
1221                  */
1222                 max  = INT_GET(hdr2->firstused, ARCH_CONVERT)
1223                                                 - sizeof(xfs_attr_leaf_hdr_t);
1224                 max -= INT_GET(hdr2->count, ARCH_CONVERT)
1225                                         * sizeof(xfs_attr_leaf_entry_t);
1226                 if (space > max) {
1227                         xfs_attr_leaf_compact(args->trans, blk2->bp);
1228                 }
1229
1230                 /*
1231                  * Move high entries from leaf1 to low end of leaf2.
1232                  */
1233                 xfs_attr_leaf_moveents(leaf1,
1234                                 INT_GET(hdr1->count, ARCH_CONVERT)-count,
1235                                 leaf2, 0, count, state->mp);
1236
1237                 xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
1238                 xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);
1239         } else if (count > INT_GET(hdr1->count, ARCH_CONVERT)) {
1240                 /*
1241                  * I assert that since all callers pass in an empty
1242                  * second buffer, this code should never execute.
1243                  */
1244
1245                 /*
1246                  * Figure the total bytes to be added to the destination leaf.
1247                  */
1248                 /* number entries being moved */
1249                 count -= INT_GET(hdr1->count, ARCH_CONVERT);
1250                 space  = totallen - INT_GET(hdr1->usedbytes, ARCH_CONVERT);
1251                 space += count * sizeof(xfs_attr_leaf_entry_t);
1252
1253                 /*
1254                  * leaf1 is the destination, compact it if it looks tight.
1255                  */
1256                 max  = INT_GET(hdr1->firstused, ARCH_CONVERT)
1257                                                 - sizeof(xfs_attr_leaf_hdr_t);
1258                 max -= INT_GET(hdr1->count, ARCH_CONVERT)
1259                                         * sizeof(xfs_attr_leaf_entry_t);
1260                 if (space > max) {
1261                         xfs_attr_leaf_compact(args->trans, blk1->bp);
1262                 }
1263
1264                 /*
1265                  * Move low entries from leaf2 to high end of leaf1.
1266                  */
1267                 xfs_attr_leaf_moveents(leaf2, 0, leaf1,
1268                                 (int)INT_GET(hdr1->count, ARCH_CONVERT), count,
1269                                 state->mp);
1270
1271                 xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
1272                 xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);
1273         }
1274
1275         /*
1276          * Copy out last hashval in each block for B-tree code.
1277          */
1278         blk1->hashval =
1279             INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count,
1280                                     ARCH_CONVERT)-1].hashval, ARCH_CONVERT);
1281         blk2->hashval =
1282             INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count,
1283                                     ARCH_CONVERT)-1].hashval, ARCH_CONVERT);
1284
1285         /*
1286          * Adjust the expected index for insertion.
1287          * NOTE: this code depends on the (current) situation that the
1288          * second block was originally empty.
1289          *
1290          * If the insertion point moved to the 2nd block, we must adjust
1291          * the index.  We must also track the entry just following the
1292          * new entry for use in an "atomic rename" operation, that entry
1293          * is always the "old" entry and the "new" entry is what we are
1294          * inserting.  The index/blkno fields refer to the "old" entry,
1295          * while the index2/blkno2 fields refer to the "new" entry.
1296          */
1297         if (blk1->index > INT_GET(leaf1->hdr.count, ARCH_CONVERT)) {
1298                 ASSERT(state->inleaf == 0);
1299                 blk2->index = blk1->index
1300                                 - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
1301                 args->index = args->index2 = blk2->index;
1302                 args->blkno = args->blkno2 = blk2->blkno;
1303         } else if (blk1->index == INT_GET(leaf1->hdr.count, ARCH_CONVERT)) {
1304                 if (state->inleaf) {
1305                         args->index = blk1->index;
1306                         args->blkno = blk1->blkno;
1307                         args->index2 = 0;
1308                         args->blkno2 = blk2->blkno;
1309                 } else {
1310                         blk2->index = blk1->index
1311                                     - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
1312                         args->index = args->index2 = blk2->index;
1313                         args->blkno = args->blkno2 = blk2->blkno;
1314                 }
1315         } else {
1316                 ASSERT(state->inleaf == 1);
1317                 args->index = args->index2 = blk1->index;
1318                 args->blkno = args->blkno2 = blk1->blkno;
1319         }
1320 }
1321
1322 /*
1323  * Examine entries until we reduce the absolute difference in
1324  * byte usage between the two blocks to a minimum.
1325  * GROT: Is this really necessary?  With other than a 512 byte blocksize,
1326  * GROT: there will always be enough room in either block for a new entry.
1327  * GROT: Do a double-split for this case?
1328  */
1329 STATIC int
1330 xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
1331                                     xfs_da_state_blk_t *blk1,
1332                                     xfs_da_state_blk_t *blk2,
1333                                     int *countarg, int *usedbytesarg)
1334 {
1335         xfs_attr_leafblock_t *leaf1, *leaf2;
1336         xfs_attr_leaf_hdr_t *hdr1, *hdr2;
1337         xfs_attr_leaf_entry_t *entry;
1338         int count, max, index, totallen, half;
1339         int lastdelta, foundit, tmp;
1340
1341         /*
1342          * Set up environment.
1343          */
1344         leaf1 = blk1->bp->data;
1345         leaf2 = blk2->bp->data;
1346         hdr1 = &leaf1->hdr;
1347         hdr2 = &leaf2->hdr;
1348         foundit = 0;
1349         totallen = 0;
1350
1351         /*
1352          * Examine entries until we reduce the absolute difference in
1353          * byte usage between the two blocks to a minimum.
1354          */
1355         max = INT_GET(hdr1->count, ARCH_CONVERT)
1356                         + INT_GET(hdr2->count, ARCH_CONVERT);
1357         half  = (max+1) * sizeof(*entry);
1358         half += INT_GET(hdr1->usedbytes, ARCH_CONVERT)
1359                                 + INT_GET(hdr2->usedbytes, ARCH_CONVERT)
1360                                 + xfs_attr_leaf_newentsize(state->args,
1361                                                      state->blocksize, NULL);
1362         half /= 2;
1363         lastdelta = state->blocksize;
1364         entry = &leaf1->entries[0];
1365         for (count = index = 0; count < max; entry++, index++, count++) {
1366
1367 #define XFS_ATTR_ABS(A) (((A) < 0) ? -(A) : (A))
1368                 /*
1369                  * The new entry is in the first block, account for it.
1370                  */
1371                 if (count == blk1->index) {
1372                         tmp = totallen + sizeof(*entry) +
1373                                 xfs_attr_leaf_newentsize(state->args,
1374                                                          state->blocksize,
1375                                                          NULL);
1376                         if (XFS_ATTR_ABS(half - tmp) > lastdelta)
1377                                 break;
1378                         lastdelta = XFS_ATTR_ABS(half - tmp);
1379                         totallen = tmp;
1380                         foundit = 1;
1381                 }
1382
1383                 /*
1384                  * Wrap around into the second block if necessary.
1385                  */
1386                 if (count == INT_GET(hdr1->count, ARCH_CONVERT)) {
1387                         leaf1 = leaf2;
1388                         entry = &leaf1->entries[0];
1389                         index = 0;
1390                 }
1391
1392                 /*
1393                  * Figure out if next leaf entry would be too much.
1394                  */
1395                 tmp = totallen + sizeof(*entry) + xfs_attr_leaf_entsize(leaf1,
1396                                                                         index);
1397                 if (XFS_ATTR_ABS(half - tmp) > lastdelta)
1398                         break;
1399                 lastdelta = XFS_ATTR_ABS(half - tmp);
1400                 totallen = tmp;
1401 #undef XFS_ATTR_ABS
1402         }
1403
1404         /*
1405          * Calculate the number of usedbytes that will end up in lower block.
1406          * If new entry not in lower block, fix up the count.
1407          */
1408         totallen -= count * sizeof(*entry);
1409         if (foundit) {
1410                 totallen -= sizeof(*entry) +
1411                                 xfs_attr_leaf_newentsize(state->args,
1412                                                          state->blocksize,
1413                                                          NULL);
1414         }
1415
1416         *countarg = count;
1417         *usedbytesarg = totallen;
1418         return(foundit);
1419 }
1420
1421 /*========================================================================
1422  * Routines used for shrinking the Btree.
1423  *========================================================================*/
1424
1425 /*
1426  * Check a leaf block and its neighbors to see if the block should be
1427  * collapsed into one or the other neighbor.  Always keep the block
1428  * with the smaller block number.
1429  * If the current block is over 50% full, don't try to join it, return 0.
1430  * If the block is empty, fill in the state structure and return 2.
1431  * If it can be collapsed, fill in the state structure and return 1.
1432  * If nothing can be done, return 0.
1433  *
1434  * GROT: allow for INCOMPLETE entries in calculation.
1435  */
1436 int
1437 xfs_attr_leaf_toosmall(xfs_da_state_t *state, int *action)
1438 {
1439         xfs_attr_leafblock_t *leaf;
1440         xfs_da_state_blk_t *blk;
1441         xfs_da_blkinfo_t *info;
1442         int count, bytes, forward, error, retval, i;
1443         xfs_dablk_t blkno;
1444         xfs_dabuf_t *bp;
1445
1446         /*
1447          * Check for the degenerate case of the block being over 50% full.
1448          * If so, it's not worth even looking to see if we might be able
1449          * to coalesce with a sibling.
1450          */
1451         blk = &state->path.blk[ state->path.active-1 ];
1452         info = blk->bp->data;
1453         ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC);
1454         leaf = (xfs_attr_leafblock_t *)info;
1455         count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
1456         bytes = sizeof(xfs_attr_leaf_hdr_t) +
1457                 count * sizeof(xfs_attr_leaf_entry_t) +
1458                 INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
1459         if (bytes > (state->blocksize >> 1)) {
1460                 *action = 0;    /* blk over 50%, don't try to join */
1461                 return(0);
1462         }
1463
1464         /*
1465          * Check for the degenerate case of the block being empty.
1466          * If the block is empty, we'll simply delete it, no need to
1467          * coalesce it with a sibling block.  We choose (aribtrarily)
1468          * to merge with the forward block unless it is NULL.
1469          */
1470         if (count == 0) {
1471                 /*
1472                  * Make altpath point to the block we want to keep and
1473                  * path point to the block we want to drop (this one).
1474                  */
1475                 forward = info->forw;
1476                 memcpy(&state->altpath, &state->path, sizeof(state->path));
1477                 error = xfs_da_path_shift(state, &state->altpath, forward,
1478                                                  0, &retval);
1479                 if (error)
1480                         return(error);
1481                 if (retval) {
1482                         *action = 0;
1483                 } else {
1484                         *action = 2;
1485                 }
1486                 return(0);
1487         }
1488
1489         /*
1490          * Examine each sibling block to see if we can coalesce with
1491          * at least 25% free space to spare.  We need to figure out
1492          * whether to merge with the forward or the backward block.
1493          * We prefer coalescing with the lower numbered sibling so as
1494          * to shrink an attribute list over time.
1495          */
1496         /* start with smaller blk num */
1497         forward = (INT_GET(info->forw, ARCH_CONVERT)
1498                                         < INT_GET(info->back, ARCH_CONVERT));
1499         for (i = 0; i < 2; forward = !forward, i++) {
1500                 if (forward)
1501                         blkno = INT_GET(info->forw, ARCH_CONVERT);
1502                 else
1503                         blkno = INT_GET(info->back, ARCH_CONVERT);
1504                 if (blkno == 0)
1505                         continue;
1506                 error = xfs_da_read_buf(state->args->trans, state->args->dp,
1507                                         blkno, -1, &bp, XFS_ATTR_FORK);
1508                 if (error)
1509                         return(error);
1510                 ASSERT(bp != NULL);
1511
1512                 leaf = (xfs_attr_leafblock_t *)info;
1513                 count  = INT_GET(leaf->hdr.count, ARCH_CONVERT);
1514                 bytes  = state->blocksize - (state->blocksize>>2);
1515                 bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
1516                 leaf = bp->data;
1517                 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1518                                                 == XFS_ATTR_LEAF_MAGIC);
1519                 count += INT_GET(leaf->hdr.count, ARCH_CONVERT);
1520                 bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
1521                 bytes -= count * sizeof(xfs_attr_leaf_entry_t);
1522                 bytes -= sizeof(xfs_attr_leaf_hdr_t);
1523                 xfs_da_brelse(state->args->trans, bp);
1524                 if (bytes >= 0)
1525                         break;  /* fits with at least 25% to spare */
1526         }
1527         if (i >= 2) {
1528                 *action = 0;
1529                 return(0);
1530         }
1531
1532         /*
1533          * Make altpath point to the block we want to keep (the lower
1534          * numbered block) and path point to the block we want to drop.
1535          */
1536         memcpy(&state->altpath, &state->path, sizeof(state->path));
1537         if (blkno < blk->blkno) {
1538                 error = xfs_da_path_shift(state, &state->altpath, forward,
1539                                                  0, &retval);
1540         } else {
1541                 error = xfs_da_path_shift(state, &state->path, forward,
1542                                                  0, &retval);
1543         }
1544         if (error)
1545                 return(error);
1546         if (retval) {
1547                 *action = 0;
1548         } else {
1549                 *action = 1;
1550         }
1551         return(0);
1552 }
1553
1554 /*
1555  * Remove a name from the leaf attribute list structure.
1556  *
1557  * Return 1 if leaf is less than 37% full, 0 if >= 37% full.
1558  * If two leaves are 37% full, when combined they will leave 25% free.
1559  */
1560 int
1561 xfs_attr_leaf_remove(xfs_dabuf_t *bp, xfs_da_args_t *args)
1562 {
1563         xfs_attr_leafblock_t *leaf;
1564         xfs_attr_leaf_hdr_t *hdr;
1565         xfs_attr_leaf_map_t *map;
1566         xfs_attr_leaf_entry_t *entry;
1567         int before, after, smallest, entsize;
1568         int tablesize, tmp, i;
1569         xfs_mount_t *mp;
1570
1571         leaf = bp->data;
1572         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1573                                                 == XFS_ATTR_LEAF_MAGIC);
1574         hdr = &leaf->hdr;
1575         mp = args->trans->t_mountp;
1576         ASSERT((INT_GET(hdr->count, ARCH_CONVERT) > 0)
1577                 && (INT_GET(hdr->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)));
1578         ASSERT((args->index >= 0)
1579                 && (args->index < INT_GET(hdr->count, ARCH_CONVERT)));
1580         ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT)
1581                                 >= ((INT_GET(hdr->count, ARCH_CONVERT)
1582                                         * sizeof(*entry))+sizeof(*hdr)));
1583         entry = &leaf->entries[args->index];
1584         ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT)
1585                                 >= INT_GET(hdr->firstused, ARCH_CONVERT));
1586         ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp));
1587
1588         /*
1589          * Scan through free region table:
1590          *    check for adjacency of free'd entry with an existing one,
1591          *    find smallest free region in case we need to replace it,
1592          *    adjust any map that borders the entry table,
1593          */
1594         tablesize = INT_GET(hdr->count, ARCH_CONVERT)
1595                                         * sizeof(xfs_attr_leaf_entry_t)
1596                                         + sizeof(xfs_attr_leaf_hdr_t);
1597         map = &hdr->freemap[0];
1598         tmp = INT_GET(map->size, ARCH_CONVERT);
1599         before = after = -1;
1600         smallest = XFS_ATTR_LEAF_MAPSIZE - 1;
1601         entsize = xfs_attr_leaf_entsize(leaf, args->index);
1602         for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
1603                 ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
1604                 ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
1605                 if (INT_GET(map->base, ARCH_CONVERT) == tablesize) {
1606                         INT_MOD(map->base, ARCH_CONVERT,
1607                                         -sizeof(xfs_attr_leaf_entry_t));
1608                         INT_MOD(map->size, ARCH_CONVERT,
1609                                         sizeof(xfs_attr_leaf_entry_t));
1610                 }
1611
1612                 if ((INT_GET(map->base, ARCH_CONVERT)
1613                                         + INT_GET(map->size, ARCH_CONVERT))
1614                                 == INT_GET(entry->nameidx, ARCH_CONVERT)) {
1615                         before = i;
1616                 } else if (INT_GET(map->base, ARCH_CONVERT)
1617                         == (INT_GET(entry->nameidx, ARCH_CONVERT) + entsize)) {
1618                         after = i;
1619                 } else if (INT_GET(map->size, ARCH_CONVERT) < tmp) {
1620                         tmp = INT_GET(map->size, ARCH_CONVERT);
1621                         smallest = i;
1622                 }
1623         }
1624
1625         /*
1626          * Coalesce adjacent freemap regions,
1627          * or replace the smallest region.
1628          */
1629         if ((before >= 0) || (after >= 0)) {
1630                 if ((before >= 0) && (after >= 0)) {
1631                         map = &hdr->freemap[before];
1632                         INT_MOD(map->size, ARCH_CONVERT, entsize);
1633                         INT_MOD(map->size, ARCH_CONVERT,
1634                                 INT_GET(hdr->freemap[after].size,
1635                                                         ARCH_CONVERT));
1636                         hdr->freemap[after].base = 0;
1637                         hdr->freemap[after].size = 0;
1638                 } else if (before >= 0) {
1639                         map = &hdr->freemap[before];
1640                         INT_MOD(map->size, ARCH_CONVERT, entsize);
1641                 } else {
1642                         map = &hdr->freemap[after];
1643                         /* both on-disk, don't endian flip twice */
1644                         map->base = entry->nameidx;
1645                         INT_MOD(map->size, ARCH_CONVERT, entsize);
1646                 }
1647         } else {
1648                 /*
1649                  * Replace smallest region (if it is smaller than free'd entry)
1650                  */
1651                 map = &hdr->freemap[smallest];
1652                 if (INT_GET(map->size, ARCH_CONVERT) < entsize) {
1653                         INT_SET(map->base, ARCH_CONVERT,
1654                                         INT_GET(entry->nameidx, ARCH_CONVERT));
1655                         INT_SET(map->size, ARCH_CONVERT, entsize);
1656                 }
1657         }
1658
1659         /*
1660          * Did we remove the first entry?
1661          */
1662         if (INT_GET(entry->nameidx, ARCH_CONVERT)
1663                                 == INT_GET(hdr->firstused, ARCH_CONVERT))
1664                 smallest = 1;
1665         else
1666                 smallest = 0;
1667
1668         /*
1669          * Compress the remaining entries and zero out the removed stuff.
1670          */
1671         memset(XFS_ATTR_LEAF_NAME(leaf, args->index), 0, entsize);
1672         INT_MOD(hdr->usedbytes, ARCH_CONVERT, -entsize);
1673         xfs_da_log_buf(args->trans, bp,
1674              XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
1675                                    entsize));
1676
1677         tmp = (INT_GET(hdr->count, ARCH_CONVERT) - args->index)
1678                                         * sizeof(xfs_attr_leaf_entry_t);
1679         memmove((char *)entry, (char *)(entry+1), tmp);
1680         INT_MOD(hdr->count, ARCH_CONVERT, -1);
1681         xfs_da_log_buf(args->trans, bp,
1682             XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
1683         entry = &leaf->entries[INT_GET(hdr->count, ARCH_CONVERT)];
1684         memset((char *)entry, 0, sizeof(xfs_attr_leaf_entry_t));
1685
1686         /*
1687          * If we removed the first entry, re-find the first used byte
1688          * in the name area.  Note that if the entry was the "firstused",
1689          * then we don't have a "hole" in our block resulting from
1690          * removing the name.
1691          */
1692         if (smallest) {
1693                 tmp = XFS_LBSIZE(mp);
1694                 entry = &leaf->entries[0];
1695                 for (i = INT_GET(hdr->count, ARCH_CONVERT)-1;
1696                                                 i >= 0; entry++, i--) {
1697                         ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT)
1698                                 >= INT_GET(hdr->firstused, ARCH_CONVERT));
1699                         ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT)
1700                                                         < XFS_LBSIZE(mp));
1701                         if (INT_GET(entry->nameidx, ARCH_CONVERT) < tmp)
1702                                 tmp = INT_GET(entry->nameidx, ARCH_CONVERT);
1703                 }
1704                 INT_SET(hdr->firstused, ARCH_CONVERT, tmp);
1705                 if (!hdr->firstused) {
1706                         INT_SET(hdr->firstused, ARCH_CONVERT,
1707                                         tmp - XFS_ATTR_LEAF_NAME_ALIGN);
1708                 }
1709         } else {
1710                 hdr->holes = 1;         /* mark as needing compaction */
1711         }
1712         xfs_da_log_buf(args->trans, bp,
1713                           XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
1714
1715         /*
1716          * Check if leaf is less than 50% full, caller may want to
1717          * "join" the leaf with a sibling if so.
1718          */
1719         tmp  = sizeof(xfs_attr_leaf_hdr_t);
1720         tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT)
1721                                         * sizeof(xfs_attr_leaf_entry_t);
1722         tmp += INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
1723         return(tmp < mp->m_attr_magicpct); /* leaf is < 37% full */
1724 }
1725
1726 /*
1727  * Move all the attribute list entries from drop_leaf into save_leaf.
1728  */
1729 void
1730 xfs_attr_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
1731                                        xfs_da_state_blk_t *save_blk)
1732 {
1733         xfs_attr_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf;
1734         xfs_attr_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr;
1735         xfs_mount_t *mp;
1736         char *tmpbuffer;
1737
1738         /*
1739          * Set up environment.
1740          */
1741         mp = state->mp;
1742         ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC);
1743         ASSERT(save_blk->magic == XFS_ATTR_LEAF_MAGIC);
1744         drop_leaf = drop_blk->bp->data;
1745         save_leaf = save_blk->bp->data;
1746         ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT)
1747                                                 == XFS_ATTR_LEAF_MAGIC);
1748         ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT)
1749                                                 == XFS_ATTR_LEAF_MAGIC);
1750         drop_hdr = &drop_leaf->hdr;
1751         save_hdr = &save_leaf->hdr;
1752
1753         /*
1754          * Save last hashval from dying block for later Btree fixup.
1755          */
1756         drop_blk->hashval =
1757                 INT_GET(drop_leaf->entries[INT_GET(drop_leaf->hdr.count,
1758                                                 ARCH_CONVERT)-1].hashval,
1759                                                                 ARCH_CONVERT);
1760
1761         /*
1762          * Check if we need a temp buffer, or can we do it in place.
1763          * Note that we don't check "leaf" for holes because we will
1764          * always be dropping it, toosmall() decided that for us already.
1765          */
1766         if (save_hdr->holes == 0) {
1767                 /*
1768                  * dest leaf has no holes, so we add there.  May need
1769                  * to make some room in the entry array.
1770                  */
1771                 if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
1772                         xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, 0,
1773                              (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
1774                 } else {
1775                         xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf,
1776                                   INT_GET(save_hdr->count, ARCH_CONVERT),
1777                                   (int)INT_GET(drop_hdr->count, ARCH_CONVERT),
1778                                   mp);
1779                 }
1780         } else {
1781                 /*
1782                  * Destination has holes, so we make a temporary copy
1783                  * of the leaf and add them both to that.
1784                  */
1785                 tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP);
1786                 ASSERT(tmpbuffer != NULL);
1787                 memset(tmpbuffer, 0, state->blocksize);
1788                 tmp_leaf = (xfs_attr_leafblock_t *)tmpbuffer;
1789                 tmp_hdr = &tmp_leaf->hdr;
1790                 tmp_hdr->info = save_hdr->info; /* struct copy */
1791                 tmp_hdr->count = 0;
1792                 INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize);
1793                 if (!tmp_hdr->firstused) {
1794                         INT_SET(tmp_hdr->firstused, ARCH_CONVERT,
1795                                 state->blocksize - XFS_ATTR_LEAF_NAME_ALIGN);
1796                 }
1797                 tmp_hdr->usedbytes = 0;
1798                 if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
1799                         xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, 0,
1800                                 (int)INT_GET(drop_hdr->count, ARCH_CONVERT),
1801                                 mp);
1802                         xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf,
1803                                   INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
1804                                  (int)INT_GET(save_hdr->count, ARCH_CONVERT),
1805                                  mp);
1806                 } else {
1807                         xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, 0,
1808                                 (int)INT_GET(save_hdr->count, ARCH_CONVERT),
1809                                 mp);
1810                         xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf,
1811                                 INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
1812                                 (int)INT_GET(drop_hdr->count, ARCH_CONVERT),
1813                                 mp);
1814                 }
1815                 memcpy((char *)save_leaf, (char *)tmp_leaf, state->blocksize);
1816                 kmem_free(tmpbuffer, state->blocksize);
1817         }
1818
1819         xfs_da_log_buf(state->args->trans, save_blk->bp, 0,
1820                                            state->blocksize - 1);
1821
1822         /*
1823          * Copy out last hashval in each block for B-tree code.
1824          */
1825         save_blk->hashval =
1826                 INT_GET(save_leaf->entries[INT_GET(save_leaf->hdr.count,
1827                                                 ARCH_CONVERT)-1].hashval,
1828                                                                 ARCH_CONVERT);
1829 }
1830
1831 /*========================================================================
1832  * Routines used for finding things in the Btree.
1833  *========================================================================*/
1834
1835 /*
1836  * Look up a name in a leaf attribute list structure.
1837  * This is the internal routine, it uses the caller's buffer.
1838  *
1839  * Note that duplicate keys are allowed, but only check within the
1840  * current leaf node.  The Btree code must check in adjacent leaf nodes.
1841  *
1842  * Return in args->index the index into the entry[] array of either
1843  * the found entry, or where the entry should have been (insert before
1844  * that entry).
1845  *
1846  * Don't change the args->value unless we find the attribute.
1847  */
1848 int
1849 xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args)
1850 {
1851         xfs_attr_leafblock_t *leaf;
1852         xfs_attr_leaf_entry_t *entry;
1853         xfs_attr_leaf_name_local_t *name_loc;
1854         xfs_attr_leaf_name_remote_t *name_rmt;
1855         int probe, span;
1856         xfs_dahash_t hashval;
1857
1858         leaf = bp->data;
1859         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1860                                                 == XFS_ATTR_LEAF_MAGIC);
1861         ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT)
1862                                         < (XFS_LBSIZE(args->dp->i_mount)/8));
1863
1864         /*
1865          * Binary search.  (note: small blocks will skip this loop)
1866          */
1867         hashval = args->hashval;
1868         probe = span = INT_GET(leaf->hdr.count, ARCH_CONVERT) / 2;
1869         for (entry = &leaf->entries[probe]; span > 4;
1870                    entry = &leaf->entries[probe]) {
1871                 span /= 2;
1872                 if (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)
1873                         probe += span;
1874                 else if (INT_GET(entry->hashval, ARCH_CONVERT) > hashval)
1875                         probe -= span;
1876                 else
1877                         break;
1878         }
1879         ASSERT((probe >= 0) &&
1880                (!leaf->hdr.count
1881                || (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))));
1882         ASSERT((span <= 4) || (INT_GET(entry->hashval, ARCH_CONVERT)
1883                                                         == hashval));
1884
1885         /*
1886          * Since we may have duplicate hashval's, find the first matching
1887          * hashval in the leaf.
1888          */
1889         while ((probe > 0) && (INT_GET(entry->hashval, ARCH_CONVERT)
1890                                                         >= hashval)) {
1891                 entry--;
1892                 probe--;
1893         }
1894         while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))
1895                 && (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)) {
1896                 entry++;
1897                 probe++;
1898         }
1899         if ((probe == INT_GET(leaf->hdr.count, ARCH_CONVERT))
1900                     || (INT_GET(entry->hashval, ARCH_CONVERT) != hashval)) {
1901                 args->index = probe;
1902                 return(XFS_ERROR(ENOATTR));
1903         }
1904
1905         /*
1906          * Duplicate keys may be present, so search all of them for a match.
1907          */
1908         for (  ; (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))
1909                         && (INT_GET(entry->hashval, ARCH_CONVERT) == hashval);
1910                         entry++, probe++) {
1911 /*
1912  * GROT: Add code to remove incomplete entries.
1913  */
1914                 /*
1915                  * If we are looking for INCOMPLETE entries, show only those.
1916                  * If we are looking for complete entries, show only those.
1917                  */
1918                 if ((args->flags & XFS_ATTR_INCOMPLETE) !=
1919                     (entry->flags & XFS_ATTR_INCOMPLETE)) {
1920                         continue;
1921                 }
1922                 if (entry->flags & XFS_ATTR_LOCAL) {
1923                         name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, probe);
1924                         if (name_loc->namelen != args->namelen)
1925                                 continue;
1926                         if (memcmp(args->name, (char *)name_loc->nameval,
1927                                              args->namelen) != 0)
1928                                 continue;
1929                         if (((args->flags & ATTR_SECURE) != 0) !=
1930                             ((entry->flags & XFS_ATTR_SECURE) != 0))
1931                                 continue;
1932                         if (((args->flags & ATTR_ROOT) != 0) !=
1933                             ((entry->flags & XFS_ATTR_ROOT) != 0))
1934                                 continue;
1935                         args->index = probe;
1936                         return(XFS_ERROR(EEXIST));
1937                 } else {
1938                         name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, probe);
1939                         if (name_rmt->namelen != args->namelen)
1940                                 continue;
1941                         if (memcmp(args->name, (char *)name_rmt->name,
1942                                              args->namelen) != 0)
1943                                 continue;
1944                         if (((args->flags & ATTR_SECURE) != 0) !=
1945                             ((entry->flags & XFS_ATTR_SECURE) != 0))
1946                                 continue;
1947                         if (((args->flags & ATTR_ROOT) != 0) !=
1948                             ((entry->flags & XFS_ATTR_ROOT) != 0))
1949                                 continue;
1950                         args->index = probe;
1951                         args->rmtblkno
1952                                   = INT_GET(name_rmt->valueblk, ARCH_CONVERT);
1953                         args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount,
1954                                                    INT_GET(name_rmt->valuelen,
1955                                                                 ARCH_CONVERT));
1956                         return(XFS_ERROR(EEXIST));
1957                 }
1958         }
1959         args->index = probe;
1960         return(XFS_ERROR(ENOATTR));
1961 }
1962
1963 /*
1964  * Get the value associated with an attribute name from a leaf attribute
1965  * list structure.
1966  */
1967 int
1968 xfs_attr_leaf_getvalue(xfs_dabuf_t *bp, xfs_da_args_t *args)
1969 {
1970         int valuelen;
1971         xfs_attr_leafblock_t *leaf;
1972         xfs_attr_leaf_entry_t *entry;
1973         xfs_attr_leaf_name_local_t *name_loc;
1974         xfs_attr_leaf_name_remote_t *name_rmt;
1975
1976         leaf = bp->data;
1977         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1978                                                 == XFS_ATTR_LEAF_MAGIC);
1979         ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT)
1980                                         < (XFS_LBSIZE(args->dp->i_mount)/8));
1981         ASSERT(args->index < ((int)INT_GET(leaf->hdr.count, ARCH_CONVERT)));
1982
1983         entry = &leaf->entries[args->index];
1984         if (entry->flags & XFS_ATTR_LOCAL) {
1985                 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
1986                 ASSERT(name_loc->namelen == args->namelen);
1987                 ASSERT(memcmp(args->name, name_loc->nameval, args->namelen) == 0);
1988                 valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT);
1989                 if (args->flags & ATTR_KERNOVAL) {
1990                         args->valuelen = valuelen;
1991                         return(0);
1992                 }
1993                 if (args->valuelen < valuelen) {
1994                         args->valuelen = valuelen;
1995                         return(XFS_ERROR(ERANGE));
1996                 }
1997                 args->valuelen = valuelen;
1998                 memcpy(args->value, &name_loc->nameval[args->namelen], valuelen);
1999         } else {
2000                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2001                 ASSERT(name_rmt->namelen == args->namelen);
2002                 ASSERT(memcmp(args->name, name_rmt->name, args->namelen) == 0);
2003                 valuelen = INT_GET(name_rmt->valuelen, ARCH_CONVERT);
2004                 args->rmtblkno = INT_GET(name_rmt->valueblk, ARCH_CONVERT);
2005                 args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount, valuelen);
2006                 if (args->flags & ATTR_KERNOVAL) {
2007                         args->valuelen = valuelen;
2008                         return(0);
2009                 }
2010                 if (args->valuelen < valuelen) {
2011                         args->valuelen = valuelen;
2012                         return(XFS_ERROR(ERANGE));
2013                 }
2014                 args->valuelen = valuelen;
2015         }
2016         return(0);
2017 }
2018
2019 /*========================================================================
2020  * Utility routines.
2021  *========================================================================*/
2022
2023 /*
2024  * Move the indicated entries from one leaf to another.
2025  * NOTE: this routine modifies both source and destination leaves.
2026  */
2027 /*ARGSUSED*/
2028 STATIC void
2029 xfs_attr_leaf_moveents(xfs_attr_leafblock_t *leaf_s, int start_s,
2030                         xfs_attr_leafblock_t *leaf_d, int start_d,
2031                         int count, xfs_mount_t *mp)
2032 {
2033         xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
2034         xfs_attr_leaf_entry_t *entry_s, *entry_d;
2035         int desti, tmp, i;
2036
2037         /*
2038          * Check for nothing to do.
2039          */
2040         if (count == 0)
2041                 return;
2042
2043         /*
2044          * Set up environment.
2045          */
2046         ASSERT(INT_GET(leaf_s->hdr.info.magic, ARCH_CONVERT)
2047                                                 == XFS_ATTR_LEAF_MAGIC);
2048         ASSERT(INT_GET(leaf_d->hdr.info.magic, ARCH_CONVERT)
2049                                                 == XFS_ATTR_LEAF_MAGIC);
2050         hdr_s = &leaf_s->hdr;
2051         hdr_d = &leaf_d->hdr;
2052         ASSERT((INT_GET(hdr_s->count, ARCH_CONVERT) > 0)
2053                                 && (INT_GET(hdr_s->count, ARCH_CONVERT)
2054                                                 < (XFS_LBSIZE(mp)/8)));
2055         ASSERT(INT_GET(hdr_s->firstused, ARCH_CONVERT) >=
2056                 ((INT_GET(hdr_s->count, ARCH_CONVERT)
2057                                         * sizeof(*entry_s))+sizeof(*hdr_s)));
2058         ASSERT(INT_GET(hdr_d->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8));
2059         ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >=
2060                 ((INT_GET(hdr_d->count, ARCH_CONVERT)
2061                                         * sizeof(*entry_d))+sizeof(*hdr_d)));
2062
2063         ASSERT(start_s < INT_GET(hdr_s->count, ARCH_CONVERT));
2064         ASSERT(start_d <= INT_GET(hdr_d->count, ARCH_CONVERT));
2065         ASSERT(count <= INT_GET(hdr_s->count, ARCH_CONVERT));
2066
2067         /*
2068          * Move the entries in the destination leaf up to make a hole?
2069          */
2070         if (start_d < INT_GET(hdr_d->count, ARCH_CONVERT)) {
2071                 tmp  = INT_GET(hdr_d->count, ARCH_CONVERT) - start_d;
2072                 tmp *= sizeof(xfs_attr_leaf_entry_t);
2073                 entry_s = &leaf_d->entries[start_d];
2074                 entry_d = &leaf_d->entries[start_d + count];
2075                 memmove((char *)entry_d, (char *)entry_s, tmp);
2076         }
2077
2078         /*
2079          * Copy all entry's in the same (sorted) order,
2080          * but allocate attribute info packed and in sequence.
2081          */
2082         entry_s = &leaf_s->entries[start_s];
2083         entry_d = &leaf_d->entries[start_d];
2084         desti = start_d;
2085         for (i = 0; i < count; entry_s++, entry_d++, desti++, i++) {
2086                 ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT)
2087                                 >= INT_GET(hdr_s->firstused, ARCH_CONVERT));
2088                 tmp = xfs_attr_leaf_entsize(leaf_s, start_s + i);
2089 #ifdef GROT
2090                 /*
2091                  * Code to drop INCOMPLETE entries.  Difficult to use as we
2092                  * may also need to change the insertion index.  Code turned
2093                  * off for 6.2, should be revisited later.
2094                  */
2095                 if (entry_s->flags & XFS_ATTR_INCOMPLETE) { /* skip partials? */
2096                         memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);
2097                         INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp);
2098                         INT_MOD(hdr_s->count, ARCH_CONVERT, -1);
2099                         entry_d--;      /* to compensate for ++ in loop hdr */
2100                         desti--;
2101                         if ((start_s + i) < offset)
2102                                 result++;       /* insertion index adjustment */
2103                 } else {
2104 #endif /* GROT */
2105                         INT_MOD(hdr_d->firstused, ARCH_CONVERT, -tmp);
2106                         /* both on-disk, don't endian flip twice */
2107                         entry_d->hashval = entry_s->hashval;
2108                         /* both on-disk, don't endian flip twice */
2109                         entry_d->nameidx = hdr_d->firstused;
2110                         entry_d->flags = entry_s->flags;
2111                         ASSERT(INT_GET(entry_d->nameidx, ARCH_CONVERT) + tmp
2112                                                         <= XFS_LBSIZE(mp));
2113                         memmove(XFS_ATTR_LEAF_NAME(leaf_d, desti),
2114                                 XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), tmp);
2115                         ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) + tmp
2116                                                         <= XFS_LBSIZE(mp));
2117                         memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);
2118                         INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp);
2119                         INT_MOD(hdr_d->usedbytes, ARCH_CONVERT, tmp);
2120                         INT_MOD(hdr_s->count, ARCH_CONVERT, -1);
2121                         INT_MOD(hdr_d->count, ARCH_CONVERT, 1);
2122                         tmp = INT_GET(hdr_d->count, ARCH_CONVERT)
2123                                                 * sizeof(xfs_attr_leaf_entry_t)
2124                                                 + sizeof(xfs_attr_leaf_hdr_t);
2125                         ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= tmp);
2126 #ifdef GROT
2127                 }
2128 #endif /* GROT */
2129         }
2130
2131         /*
2132          * Zero out the entries we just copied.
2133          */
2134         if (start_s == INT_GET(hdr_s->count, ARCH_CONVERT)) {
2135                 tmp = count * sizeof(xfs_attr_leaf_entry_t);
2136                 entry_s = &leaf_s->entries[start_s];
2137                 ASSERT(((char *)entry_s + tmp) <=
2138                        ((char *)leaf_s + XFS_LBSIZE(mp)));
2139                 memset((char *)entry_s, 0, tmp);
2140         } else {
2141                 /*
2142                  * Move the remaining entries down to fill the hole,
2143                  * then zero the entries at the top.
2144                  */
2145                 tmp  = INT_GET(hdr_s->count, ARCH_CONVERT) - count;
2146                 tmp *= sizeof(xfs_attr_leaf_entry_t);
2147                 entry_s = &leaf_s->entries[start_s + count];
2148                 entry_d = &leaf_s->entries[start_s];
2149                 memmove((char *)entry_d, (char *)entry_s, tmp);
2150
2151                 tmp = count * sizeof(xfs_attr_leaf_entry_t);
2152                 entry_s = &leaf_s->entries[INT_GET(hdr_s->count,
2153                                                         ARCH_CONVERT)];
2154                 ASSERT(((char *)entry_s + tmp) <=
2155                        ((char *)leaf_s + XFS_LBSIZE(mp)));
2156                 memset((char *)entry_s, 0, tmp);
2157         }
2158
2159         /*
2160          * Fill in the freemap information
2161          */
2162         INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT,
2163                                         sizeof(xfs_attr_leaf_hdr_t));
2164         INT_MOD(hdr_d->freemap[0].base, ARCH_CONVERT,
2165                                 INT_GET(hdr_d->count, ARCH_CONVERT)
2166                                         * sizeof(xfs_attr_leaf_entry_t));
2167         INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT,
2168                                 INT_GET(hdr_d->firstused, ARCH_CONVERT)
2169                               - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
2170         hdr_d->freemap[1].base = 0;
2171         hdr_d->freemap[2].base = 0;
2172         hdr_d->freemap[1].size = 0;
2173         hdr_d->freemap[2].size = 0;
2174         hdr_s->holes = 1;       /* leaf may not be compact */
2175 }
2176
2177 /*
2178  * Compare two leaf blocks "order".
2179  * Return 0 unless leaf2 should go before leaf1.
2180  */
2181 int
2182 xfs_attr_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp)
2183 {
2184         xfs_attr_leafblock_t *leaf1, *leaf2;
2185
2186         leaf1 = leaf1_bp->data;
2187         leaf2 = leaf2_bp->data;
2188         ASSERT((INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT)
2189                                                 == XFS_ATTR_LEAF_MAGIC) &&
2190                (INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
2191                                                 == XFS_ATTR_LEAF_MAGIC));
2192         if (   (INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0)
2193             && (INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0)
2194             && (   (INT_GET(leaf2->entries[ 0 ].hashval, ARCH_CONVERT) <
2195                       INT_GET(leaf1->entries[ 0 ].hashval, ARCH_CONVERT))
2196                 || (INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count,
2197                                 ARCH_CONVERT)-1].hashval, ARCH_CONVERT) <
2198                       INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count,
2199                                 ARCH_CONVERT)-1].hashval, ARCH_CONVERT))) ) {
2200                 return(1);
2201         }
2202         return(0);
2203 }
2204
2205 /*
2206  * Pick up the last hashvalue from a leaf block.
2207  */
2208 xfs_dahash_t
2209 xfs_attr_leaf_lasthash(xfs_dabuf_t *bp, int *count)
2210 {
2211         xfs_attr_leafblock_t *leaf;
2212
2213         leaf = bp->data;
2214         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2215                                                 == XFS_ATTR_LEAF_MAGIC);
2216         if (count)
2217                 *count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
2218         if (!leaf->hdr.count)
2219                 return(0);
2220         return(INT_GET(leaf->entries[INT_GET(leaf->hdr.count,
2221                                 ARCH_CONVERT)-1].hashval, ARCH_CONVERT));
2222 }
2223
2224 /*
2225  * Calculate the number of bytes used to store the indicated attribute
2226  * (whether local or remote only calculate bytes in this block).
2227  */
2228 STATIC int
2229 xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index)
2230 {
2231         xfs_attr_leaf_name_local_t *name_loc;
2232         xfs_attr_leaf_name_remote_t *name_rmt;
2233         int size;
2234
2235         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2236                                                 == XFS_ATTR_LEAF_MAGIC);
2237         if (leaf->entries[index].flags & XFS_ATTR_LOCAL) {
2238                 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, index);
2239                 size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(name_loc->namelen,
2240                                                    INT_GET(name_loc->valuelen,
2241                                                                 ARCH_CONVERT));
2242         } else {
2243                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, index);
2244                 size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(name_rmt->namelen);
2245         }
2246         return(size);
2247 }
2248
2249 /*
2250  * Calculate the number of bytes that would be required to store the new
2251  * attribute (whether local or remote only calculate bytes in this block).
2252  * This routine decides as a side effect whether the attribute will be
2253  * a "local" or a "remote" attribute.
2254  */
2255 int
2256 xfs_attr_leaf_newentsize(xfs_da_args_t *args, int blocksize, int *local)
2257 {
2258         int size;
2259
2260         size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(args->namelen, args->valuelen);
2261         if (size < XFS_ATTR_LEAF_ENTSIZE_LOCAL_MAX(blocksize)) {
2262                 if (local) {
2263                         *local = 1;
2264                 }
2265         } else {
2266                 size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(args->namelen);
2267                 if (local) {
2268                         *local = 0;
2269                 }
2270         }
2271         return(size);
2272 }
2273
2274 /*
2275  * Copy out attribute list entries for attr_list(), for leaf attribute lists.
2276  */
2277 int
2278 xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context)
2279 {
2280         attrlist_cursor_kern_t *cursor;
2281         xfs_attr_leafblock_t *leaf;
2282         xfs_attr_leaf_entry_t *entry;
2283         xfs_attr_leaf_name_local_t *name_loc;
2284         xfs_attr_leaf_name_remote_t *name_rmt;
2285         int retval, i;
2286
2287         ASSERT(bp != NULL);
2288         leaf = bp->data;
2289         cursor = context->cursor;
2290         cursor->initted = 1;
2291
2292         xfs_attr_trace_l_cl("blk start", context, leaf);
2293
2294         /*
2295          * Re-find our place in the leaf block if this is a new syscall.
2296          */
2297         if (context->resynch) {
2298                 entry = &leaf->entries[0];
2299                 for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT);
2300                                                         entry++, i++) {
2301                         if (INT_GET(entry->hashval, ARCH_CONVERT)
2302                                                         == cursor->hashval) {
2303                                 if (cursor->offset == context->dupcnt) {
2304                                         context->dupcnt = 0;
2305                                         break;
2306                                 }
2307                                 context->dupcnt++;
2308                         } else if (INT_GET(entry->hashval, ARCH_CONVERT)
2309                                                         > cursor->hashval) {
2310                                 context->dupcnt = 0;
2311                                 break;
2312                         }
2313                 }
2314                 if (i == INT_GET(leaf->hdr.count, ARCH_CONVERT)) {
2315                         xfs_attr_trace_l_c("not found", context);
2316                         return(0);
2317                 }
2318         } else {
2319                 entry = &leaf->entries[0];
2320                 i = 0;
2321         }
2322         context->resynch = 0;
2323
2324         /*
2325          * We have found our place, start copying out the new attributes.
2326          */
2327         retval = 0;
2328         for (  ; (i < INT_GET(leaf->hdr.count, ARCH_CONVERT))
2329              && (retval == 0); entry++, i++) {
2330                 attrnames_t     *namesp;
2331
2332                 if (INT_GET(entry->hashval, ARCH_CONVERT) != cursor->hashval) {
2333                         cursor->hashval = INT_GET(entry->hashval, ARCH_CONVERT);
2334                         cursor->offset = 0;
2335                 }
2336
2337                 if (entry->flags & XFS_ATTR_INCOMPLETE)
2338                         continue;               /* skip incomplete entries */
2339                 if (((context->flags & ATTR_SECURE) != 0) !=
2340                     ((entry->flags & XFS_ATTR_SECURE) != 0) &&
2341                     !(context->flags & ATTR_KERNORMALS))
2342                         continue;               /* skip non-matching entries */
2343                 if (((context->flags & ATTR_ROOT) != 0) !=
2344                     ((entry->flags & XFS_ATTR_ROOT) != 0) &&
2345                     !(context->flags & ATTR_KERNROOTLS))
2346                         continue;               /* skip non-matching entries */
2347
2348                 namesp = (entry->flags & XFS_ATTR_SECURE) ? &attr_secure :
2349                         ((entry->flags & XFS_ATTR_ROOT) ? &attr_trusted :
2350                           &attr_user);
2351
2352                 if (entry->flags & XFS_ATTR_LOCAL) {
2353                         name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
2354                         if (context->flags & ATTR_KERNOVAL) {
2355                                 ASSERT(context->flags & ATTR_KERNAMELS);
2356                                 context->count += namesp->attr_namelen +
2357                                                 (int)name_loc->namelen + 1;
2358                         } else {
2359                                 retval = xfs_attr_put_listent(context, namesp,
2360                                         (char *)name_loc->nameval,
2361                                         (int)name_loc->namelen,
2362                                         (int)INT_GET(name_loc->valuelen,
2363                                                                 ARCH_CONVERT));
2364                         }
2365                 } else {
2366                         name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
2367                         if (context->flags & ATTR_KERNOVAL) {
2368                                 ASSERT(context->flags & ATTR_KERNAMELS);
2369                                 context->count += namesp->attr_namelen +
2370                                                 (int)name_rmt->namelen + 1;
2371                         } else {
2372                                 retval = xfs_attr_put_listent(context, namesp,
2373                                         (char *)name_rmt->name,
2374                                         (int)name_rmt->namelen,
2375                                         (int)INT_GET(name_rmt->valuelen,
2376                                                                 ARCH_CONVERT));
2377                         }
2378                 }
2379                 if (retval == 0) {
2380                         cursor->offset++;
2381                 }
2382         }
2383         xfs_attr_trace_l_cl("blk end", context, leaf);
2384         return(retval);
2385 }
2386
2387 #define ATTR_ENTBASESIZE                /* minimum bytes used by an attr */ \
2388         (((struct attrlist_ent *) 0)->a_name - (char *) 0)
2389 #define ATTR_ENTSIZE(namelen)           /* actual bytes used by an attr */ \
2390         ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
2391          & ~(sizeof(u_int32_t)-1))
2392
2393 /*
2394  * Format an attribute and copy it out to the user's buffer.
2395  * Take care to check values and protect against them changing later,
2396  * we may be reading them directly out of a user buffer.
2397  */
2398 /*ARGSUSED*/
2399 STATIC int
2400 xfs_attr_put_listent(xfs_attr_list_context_t *context,
2401                      attrnames_t *namesp, char *name, int namelen, int valuelen)
2402 {
2403         attrlist_ent_t *aep;
2404         int arraytop;
2405
2406         ASSERT(!(context->flags & ATTR_KERNOVAL));
2407         if (context->flags & ATTR_KERNAMELS) {
2408                 char *offset;
2409
2410                 ASSERT(context->count >= 0);
2411
2412                 arraytop = context->count + namesp->attr_namelen + namelen + 1;
2413                 if (arraytop > context->firstu) {
2414                         context->count = -1;    /* insufficient space */
2415                         return(1);
2416                 }
2417                 offset = (char *)context->alist + context->count;
2418                 strncpy(offset, namesp->attr_name, namesp->attr_namelen);
2419                 offset += namesp->attr_namelen;
2420                 strncpy(offset, name, namelen);                 /* real name */
2421                 offset += namelen;
2422                 *offset = '\0';
2423                 context->count += namesp->attr_namelen + namelen + 1;
2424                 return(0);
2425         }
2426
2427         ASSERT(context->count >= 0);
2428         ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
2429         ASSERT(context->firstu >= sizeof(*context->alist));
2430         ASSERT(context->firstu <= context->bufsize);
2431
2432         arraytop = sizeof(*context->alist) +
2433                         context->count * sizeof(context->alist->al_offset[0]);
2434         context->firstu -= ATTR_ENTSIZE(namelen);
2435         if (context->firstu < arraytop) {
2436                 xfs_attr_trace_l_c("buffer full", context);
2437                 context->alist->al_more = 1;
2438                 return(1);
2439         }
2440
2441         aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]);
2442         aep->a_valuelen = valuelen;
2443         memcpy(aep->a_name, name, namelen);
2444         aep->a_name[ namelen ] = 0;
2445         context->alist->al_offset[ context->count++ ] = context->firstu;
2446         context->alist->al_count = context->count;
2447         xfs_attr_trace_l_c("add", context);
2448         return(0);
2449 }
2450
2451 /*========================================================================
2452  * Manage the INCOMPLETE flag in a leaf entry
2453  *========================================================================*/
2454
2455 /*
2456  * Clear the INCOMPLETE flag on an entry in a leaf block.
2457  */
2458 int
2459 xfs_attr_leaf_clearflag(xfs_da_args_t *args)
2460 {
2461         xfs_attr_leafblock_t *leaf;
2462         xfs_attr_leaf_entry_t *entry;
2463         xfs_attr_leaf_name_remote_t *name_rmt;
2464         xfs_dabuf_t *bp;
2465         int error;
2466 #ifdef DEBUG
2467         xfs_attr_leaf_name_local_t *name_loc;
2468         int namelen;
2469         char *name;
2470 #endif /* DEBUG */
2471
2472         /*
2473          * Set up the operation.
2474          */
2475         error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
2476                                              XFS_ATTR_FORK);
2477         if (error) {
2478                 return(error);
2479         }
2480         ASSERT(bp != NULL);
2481
2482         leaf = bp->data;
2483         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2484                                                 == XFS_ATTR_LEAF_MAGIC);
2485         ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT));
2486         ASSERT(args->index >= 0);
2487         entry = &leaf->entries[ args->index ];
2488         ASSERT(entry->flags & XFS_ATTR_INCOMPLETE);
2489
2490 #ifdef DEBUG
2491         if (entry->flags & XFS_ATTR_LOCAL) {
2492                 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
2493                 namelen = name_loc->namelen;
2494                 name = (char *)name_loc->nameval;
2495         } else {
2496                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2497                 namelen = name_rmt->namelen;
2498                 name = (char *)name_rmt->name;
2499         }
2500         ASSERT(INT_GET(entry->hashval, ARCH_CONVERT) == args->hashval);
2501         ASSERT(namelen == args->namelen);
2502         ASSERT(memcmp(name, args->name, namelen) == 0);
2503 #endif /* DEBUG */
2504
2505         entry->flags &= ~XFS_ATTR_INCOMPLETE;
2506         xfs_da_log_buf(args->trans, bp,
2507                          XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
2508
2509         if (args->rmtblkno) {
2510                 ASSERT((entry->flags & XFS_ATTR_LOCAL) == 0);
2511                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2512                 INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno);
2513                 INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen);
2514                 xfs_da_log_buf(args->trans, bp,
2515                          XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
2516         }
2517         xfs_da_buf_done(bp);
2518
2519         /*
2520          * Commit the flag value change and start the next trans in series.
2521          */
2522         error = xfs_attr_rolltrans(&args->trans, args->dp);
2523
2524         return(error);
2525 }
2526
2527 /*
2528  * Set the INCOMPLETE flag on an entry in a leaf block.
2529  */
2530 int
2531 xfs_attr_leaf_setflag(xfs_da_args_t *args)
2532 {
2533         xfs_attr_leafblock_t *leaf;
2534         xfs_attr_leaf_entry_t *entry;
2535         xfs_attr_leaf_name_remote_t *name_rmt;
2536         xfs_dabuf_t *bp;
2537         int error;
2538
2539         /*
2540          * Set up the operation.
2541          */
2542         error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
2543                                              XFS_ATTR_FORK);
2544         if (error) {
2545                 return(error);
2546         }
2547         ASSERT(bp != NULL);
2548
2549         leaf = bp->data;
2550         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2551                                                 == XFS_ATTR_LEAF_MAGIC);
2552         ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT));
2553         ASSERT(args->index >= 0);
2554         entry = &leaf->entries[ args->index ];
2555
2556         ASSERT((entry->flags & XFS_ATTR_INCOMPLETE) == 0);
2557         entry->flags |= XFS_ATTR_INCOMPLETE;
2558         xfs_da_log_buf(args->trans, bp,
2559                         XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
2560         if ((entry->flags & XFS_ATTR_LOCAL) == 0) {
2561                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2562                 name_rmt->valueblk = 0;
2563                 name_rmt->valuelen = 0;
2564                 xfs_da_log_buf(args->trans, bp,
2565                          XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
2566         }
2567         xfs_da_buf_done(bp);
2568
2569         /*
2570          * Commit the flag value change and start the next trans in series.
2571          */
2572         error = xfs_attr_rolltrans(&args->trans, args->dp);
2573
2574         return(error);
2575 }
2576
2577 /*
2578  * In a single transaction, clear the INCOMPLETE flag on the leaf entry
2579  * given by args->blkno/index and set the INCOMPLETE flag on the leaf
2580  * entry given by args->blkno2/index2.
2581  *
2582  * Note that they could be in different blocks, or in the same block.
2583  */
2584 int
2585 xfs_attr_leaf_flipflags(xfs_da_args_t *args)
2586 {
2587         xfs_attr_leafblock_t *leaf1, *leaf2;
2588         xfs_attr_leaf_entry_t *entry1, *entry2;
2589         xfs_attr_leaf_name_remote_t *name_rmt;
2590         xfs_dabuf_t *bp1, *bp2;
2591         int error;
2592 #ifdef DEBUG
2593         xfs_attr_leaf_name_local_t *name_loc;
2594         int namelen1, namelen2;
2595         char *name1, *name2;
2596 #endif /* DEBUG */
2597
2598         /*
2599          * Read the block containing the "old" attr
2600          */
2601         error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp1,
2602                                              XFS_ATTR_FORK);
2603         if (error) {
2604                 return(error);
2605         }
2606         ASSERT(bp1 != NULL);
2607
2608         /*
2609          * Read the block containing the "new" attr, if it is different
2610          */
2611         if (args->blkno2 != args->blkno) {
2612                 error = xfs_da_read_buf(args->trans, args->dp, args->blkno2,
2613                                         -1, &bp2, XFS_ATTR_FORK);
2614                 if (error) {
2615                         return(error);
2616                 }
2617                 ASSERT(bp2 != NULL);
2618         } else {
2619                 bp2 = bp1;
2620         }
2621
2622         leaf1 = bp1->data;
2623         ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT)
2624                                                 == XFS_ATTR_LEAF_MAGIC);
2625         ASSERT(args->index < INT_GET(leaf1->hdr.count, ARCH_CONVERT));
2626         ASSERT(args->index >= 0);
2627         entry1 = &leaf1->entries[ args->index ];
2628
2629         leaf2 = bp2->data;
2630         ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
2631                                                 == XFS_ATTR_LEAF_MAGIC);
2632         ASSERT(args->index2 < INT_GET(leaf2->hdr.count, ARCH_CONVERT));
2633         ASSERT(args->index2 >= 0);
2634         entry2 = &leaf2->entries[ args->index2 ];
2635
2636 #ifdef DEBUG
2637         if (entry1->flags & XFS_ATTR_LOCAL) {
2638                 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf1, args->index);
2639                 namelen1 = name_loc->namelen;
2640                 name1 = (char *)name_loc->nameval;
2641         } else {
2642                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);
2643                 namelen1 = name_rmt->namelen;
2644                 name1 = (char *)name_rmt->name;
2645         }
2646         if (entry2->flags & XFS_ATTR_LOCAL) {
2647                 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf2, args->index2);
2648                 namelen2 = name_loc->namelen;
2649                 name2 = (char *)name_loc->nameval;
2650         } else {
2651                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
2652                 namelen2 = name_rmt->namelen;
2653                 name2 = (char *)name_rmt->name;
2654         }
2655         ASSERT(INT_GET(entry1->hashval, ARCH_CONVERT) == INT_GET(entry2->hashval, ARCH_CONVERT));
2656         ASSERT(namelen1 == namelen2);
2657         ASSERT(memcmp(name1, name2, namelen1) == 0);
2658 #endif /* DEBUG */
2659
2660         ASSERT(entry1->flags & XFS_ATTR_INCOMPLETE);
2661         ASSERT((entry2->flags & XFS_ATTR_INCOMPLETE) == 0);
2662
2663         entry1->flags &= ~XFS_ATTR_INCOMPLETE;
2664         xfs_da_log_buf(args->trans, bp1,
2665                           XFS_DA_LOGRANGE(leaf1, entry1, sizeof(*entry1)));
2666         if (args->rmtblkno) {
2667                 ASSERT((entry1->flags & XFS_ATTR_LOCAL) == 0);
2668                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);
2669                 INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno);
2670                 INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen);
2671                 xfs_da_log_buf(args->trans, bp1,
2672                          XFS_DA_LOGRANGE(leaf1, name_rmt, sizeof(*name_rmt)));
2673         }
2674
2675         entry2->flags |= XFS_ATTR_INCOMPLETE;
2676         xfs_da_log_buf(args->trans, bp2,
2677                           XFS_DA_LOGRANGE(leaf2, entry2, sizeof(*entry2)));
2678         if ((entry2->flags & XFS_ATTR_LOCAL) == 0) {
2679                 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
2680                 name_rmt->valueblk = 0;
2681                 name_rmt->valuelen = 0;
2682                 xfs_da_log_buf(args->trans, bp2,
2683                          XFS_DA_LOGRANGE(leaf2, name_rmt, sizeof(*name_rmt)));
2684         }
2685         xfs_da_buf_done(bp1);
2686         if (bp1 != bp2)
2687                 xfs_da_buf_done(bp2);
2688
2689         /*
2690          * Commit the flag value change and start the next trans in series.
2691          */
2692         error = xfs_attr_rolltrans(&args->trans, args->dp);
2693
2694         return(error);
2695 }
2696
2697 /*========================================================================
2698  * Indiscriminately delete the entire attribute fork
2699  *========================================================================*/
2700
2701 /*
2702  * Recurse (gasp!) through the attribute nodes until we find leaves.
2703  * We're doing a depth-first traversal in order to invalidate everything.
2704  */
2705 int
2706 xfs_attr_root_inactive(xfs_trans_t **trans, xfs_inode_t *dp)
2707 {
2708         xfs_da_blkinfo_t *info;
2709         xfs_daddr_t blkno;
2710         xfs_dabuf_t *bp;
2711         int error;
2712
2713         /*
2714          * Read block 0 to see what we have to work with.
2715          * We only get here if we have extents, since we remove
2716          * the extents in reverse order the extent containing
2717          * block 0 must still be there.
2718          */
2719         error = xfs_da_read_buf(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK);
2720         if (error)
2721                 return(error);
2722         blkno = xfs_da_blkno(bp);
2723
2724         /*
2725          * Invalidate the tree, even if the "tree" is only a single leaf block.
2726          * This is a depth-first traversal!
2727          */
2728         info = bp->data;
2729         if (INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) {
2730                 error = xfs_attr_node_inactive(trans, dp, bp, 1);
2731         } else if (INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC) {
2732                 error = xfs_attr_leaf_inactive(trans, dp, bp);
2733         } else {
2734                 error = XFS_ERROR(EIO);
2735                 xfs_da_brelse(*trans, bp);
2736         }
2737         if (error)
2738                 return(error);
2739
2740         /*
2741          * Invalidate the incore copy of the root block.
2742          */
2743         error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK);
2744         if (error)
2745                 return(error);
2746         xfs_da_binval(*trans, bp);      /* remove from cache */
2747         /*
2748          * Commit the invalidate and start the next transaction.
2749          */
2750         error = xfs_attr_rolltrans(trans, dp);
2751
2752         return (error);
2753 }
2754
2755 /*
2756  * Recurse (gasp!) through the attribute nodes until we find leaves.
2757  * We're doing a depth-first traversal in order to invalidate everything.
2758  */
2759 STATIC int
2760 xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp,
2761                                    int level)
2762 {
2763         xfs_da_blkinfo_t *info;
2764         xfs_da_intnode_t *node;
2765         xfs_dablk_t child_fsb;
2766         xfs_daddr_t parent_blkno, child_blkno;
2767         int error, count, i;
2768         xfs_dabuf_t *child_bp;
2769
2770         /*
2771          * Since this code is recursive (gasp!) we must protect ourselves.
2772          */
2773         if (level > XFS_DA_NODE_MAXDEPTH) {
2774                 xfs_da_brelse(*trans, bp);      /* no locks for later trans */
2775                 return(XFS_ERROR(EIO));
2776         }
2777
2778         node = bp->data;
2779         ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT)
2780                                                 == XFS_DA_NODE_MAGIC);
2781         parent_blkno = xfs_da_blkno(bp);        /* save for re-read later */
2782         count = INT_GET(node->hdr.count, ARCH_CONVERT);
2783         if (!count) {
2784                 xfs_da_brelse(*trans, bp);
2785                 return(0);
2786         }
2787         child_fsb = INT_GET(node->btree[0].before, ARCH_CONVERT);
2788         xfs_da_brelse(*trans, bp);      /* no locks for later trans */
2789
2790         /*
2791          * If this is the node level just above the leaves, simply loop
2792          * over the leaves removing all of them.  If this is higher up
2793          * in the tree, recurse downward.
2794          */
2795         for (i = 0; i < count; i++) {
2796                 /*
2797                  * Read the subsidiary block to see what we have to work with.
2798                  * Don't do this in a transaction.  This is a depth-first
2799                  * traversal of the tree so we may deal with many blocks
2800                  * before we come back to this one.
2801                  */
2802                 error = xfs_da_read_buf(*trans, dp, child_fsb, -2, &child_bp,
2803                                                 XFS_ATTR_FORK);
2804                 if (error)
2805                         return(error);
2806                 if (child_bp) {
2807                                                 /* save for re-read later */
2808                         child_blkno = xfs_da_blkno(child_bp);
2809
2810                         /*
2811                          * Invalidate the subtree, however we have to.
2812                          */
2813                         info = child_bp->data;
2814                         if (INT_GET(info->magic, ARCH_CONVERT)
2815                                                         == XFS_DA_NODE_MAGIC) {
2816                                 error = xfs_attr_node_inactive(trans, dp,
2817                                                 child_bp, level+1);
2818                         } else if (INT_GET(info->magic, ARCH_CONVERT)
2819                                                 == XFS_ATTR_LEAF_MAGIC) {
2820                                 error = xfs_attr_leaf_inactive(trans, dp,
2821                                                 child_bp);
2822                         } else {
2823                                 error = XFS_ERROR(EIO);
2824                                 xfs_da_brelse(*trans, child_bp);
2825                         }
2826                         if (error)
2827                                 return(error);
2828
2829                         /*
2830                          * Remove the subsidiary block from the cache
2831                          * and from the log.
2832                          */
2833                         error = xfs_da_get_buf(*trans, dp, 0, child_blkno,
2834                                 &child_bp, XFS_ATTR_FORK);
2835                         if (error)
2836                                 return(error);
2837                         xfs_da_binval(*trans, child_bp);
2838                 }
2839
2840                 /*
2841                  * If we're not done, re-read the parent to get the next
2842                  * child block number.
2843                  */
2844                 if ((i+1) < count) {
2845                         error = xfs_da_read_buf(*trans, dp, 0, parent_blkno,
2846                                 &bp, XFS_ATTR_FORK);
2847                         if (error)
2848                                 return(error);
2849                         child_fsb = INT_GET(node->btree[i+1].before, ARCH_CONVERT);
2850                         xfs_da_brelse(*trans, bp);
2851                 }
2852                 /*
2853                  * Atomically commit the whole invalidate stuff.
2854                  */
2855                 if ((error = xfs_attr_rolltrans(trans, dp)))
2856                         return (error);
2857         }
2858
2859         return(0);
2860 }
2861
2862 /*
2863  * Invalidate all of the "remote" value regions pointed to by a particular
2864  * leaf block.
2865  * Note that we must release the lock on the buffer so that we are not
2866  * caught holding something that the logging code wants to flush to disk.
2867  */
2868 STATIC int
2869 xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp)
2870 {
2871         xfs_attr_leafblock_t *leaf;
2872         xfs_attr_leaf_entry_t *entry;
2873         xfs_attr_leaf_name_remote_t *name_rmt;
2874         xfs_attr_inactive_list_t *list, *lp;
2875         int error, count, size, tmp, i;
2876
2877         leaf = bp->data;
2878         ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2879                                                 == XFS_ATTR_LEAF_MAGIC);
2880
2881         /*
2882          * Count the number of "remote" value extents.
2883          */
2884         count = 0;
2885         entry = &leaf->entries[0];
2886         for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
2887                 if (   INT_GET(entry->nameidx, ARCH_CONVERT)
2888                     && ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
2889                         name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
2890                         if (name_rmt->valueblk)
2891                                 count++;
2892                 }
2893         }
2894
2895         /*
2896          * If there are no "remote" values, we're done.
2897          */
2898         if (count == 0) {
2899                 xfs_da_brelse(*trans, bp);
2900                 return(0);
2901         }
2902
2903         /*
2904          * Allocate storage for a list of all the "remote" value extents.
2905          */
2906         size = count * sizeof(xfs_attr_inactive_list_t);
2907         list = (xfs_attr_inactive_list_t *)kmem_alloc(size, KM_SLEEP);
2908
2909         /*
2910          * Identify each of the "remote" value extents.
2911          */
2912         lp = list;
2913         entry = &leaf->entries[0];
2914         for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
2915                 if (   INT_GET(entry->nameidx, ARCH_CONVERT)
2916                     && ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
2917                         name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
2918                         if (name_rmt->valueblk) {
2919                                 /* both on-disk, don't endian flip twice */
2920                                 lp->valueblk = name_rmt->valueblk;
2921                                 INT_SET(lp->valuelen, ARCH_CONVERT,
2922                                                 XFS_B_TO_FSB(dp->i_mount,
2923                                                     INT_GET(name_rmt->valuelen,
2924                                                               ARCH_CONVERT)));
2925                                 lp++;
2926                         }
2927                 }
2928         }
2929         xfs_da_brelse(*trans, bp);      /* unlock for trans. in freextent() */
2930
2931         /*
2932          * Invalidate each of the "remote" value extents.
2933          */
2934         error = 0;
2935         for (lp = list, i = 0; i < count; i++, lp++) {
2936                 tmp = xfs_attr_leaf_freextent(trans, dp,
2937                                                      INT_GET(lp->valueblk,
2938                                                                 ARCH_CONVERT),
2939                                                      INT_GET(lp->valuelen,
2940                                                                 ARCH_CONVERT));
2941                 if (error == 0)
2942                         error = tmp;    /* save only the 1st errno */
2943         }
2944
2945         kmem_free((xfs_caddr_t)list, size);
2946         return(error);
2947 }
2948
2949 /*
2950  * Look at all the extents for this logical region,
2951  * invalidate any buffers that are incore/in transactions.
2952  */
2953 STATIC int
2954 xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp,
2955                                     xfs_dablk_t blkno, int blkcnt)
2956 {
2957         xfs_bmbt_irec_t map;
2958         xfs_dablk_t tblkno;
2959         int tblkcnt, dblkcnt, nmap, error;
2960         xfs_daddr_t dblkno;
2961         xfs_buf_t *bp;
2962
2963         /*
2964          * Roll through the "value", invalidating the attribute value's
2965          * blocks.
2966          */
2967         tblkno = blkno;
2968         tblkcnt = blkcnt;
2969         while (tblkcnt > 0) {
2970                 /*
2971                  * Try to remember where we decided to put the value.
2972                  */
2973                 nmap = 1;
2974                 error = xfs_bmapi(*trans, dp, (xfs_fileoff_t)tblkno, tblkcnt,
2975                                         XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2976                                         NULL, 0, &map, &nmap, NULL);
2977                 if (error) {
2978                         return(error);
2979                 }
2980                 ASSERT(nmap == 1);
2981                 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
2982
2983                 /*
2984                  * If it's a hole, these are already unmapped
2985                  * so there's nothing to invalidate.
2986                  */
2987                 if (map.br_startblock != HOLESTARTBLOCK) {
2988
2989                         dblkno = XFS_FSB_TO_DADDR(dp->i_mount,
2990                                                   map.br_startblock);
2991                         dblkcnt = XFS_FSB_TO_BB(dp->i_mount,
2992                                                 map.br_blockcount);
2993                         bp = xfs_trans_get_buf(*trans,
2994                                         dp->i_mount->m_ddev_targp,
2995                                         dblkno, dblkcnt, XFS_BUF_LOCK);
2996                         xfs_trans_binval(*trans, bp);
2997                         /*
2998                          * Roll to next transaction.
2999                          */
3000                         if ((error = xfs_attr_rolltrans(trans, dp)))
3001                                 return (error);
3002                 }
3003
3004                 tblkno += map.br_blockcount;
3005                 tblkcnt -= map.br_blockcount;
3006         }
3007
3008         return(0);
3009 }
3010
3011
3012 /*
3013  * Roll from one trans in the sequence of PERMANENT transactions to the next.
3014  */
3015 int
3016 xfs_attr_rolltrans(xfs_trans_t **transp, xfs_inode_t *dp)
3017 {
3018         xfs_trans_t *trans;
3019         unsigned int logres, count;
3020         int     error;
3021
3022         /*
3023          * Ensure that the inode is always logged.
3024          */
3025         trans = *transp;
3026         xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
3027
3028         /*
3029          * Copy the critical parameters from one trans to the next.
3030          */
3031         logres = trans->t_log_res;
3032         count = trans->t_log_count;
3033         *transp = xfs_trans_dup(trans);
3034
3035         /*
3036          * Commit the current transaction.
3037          * If this commit failed, then it'd just unlock those items that
3038          * are not marked ihold. That also means that a filesystem shutdown
3039          * is in progress. The caller takes the responsibility to cancel
3040          * the duplicate transaction that gets returned.
3041          */
3042         if ((error = xfs_trans_commit(trans, 0, NULL)))
3043                 return (error);
3044
3045         trans = *transp;
3046
3047         /*
3048          * Reserve space in the log for th next transaction.
3049          * This also pushes items in the "AIL", the list of logged items,
3050          * out to disk if they are taking up space at the tail of the log
3051          * that we want to use.  This requires that either nothing be locked
3052          * across this call, or that anything that is locked be logged in
3053          * the prior and the next transactions.
3054          */
3055         error = xfs_trans_reserve(trans, 0, logres, 0,
3056                                   XFS_TRANS_PERM_LOG_RES, count);
3057         /*
3058          *  Ensure that the inode is in the new transaction and locked.
3059          */
3060         if (!error) {
3061                 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
3062                 xfs_trans_ihold(trans, dp);
3063         }
3064         return (error);
3065
3066 }