SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/gfs2/eattr.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License v.2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/xattr.h>
  16 #include <linux/gfs2_ondisk.h>
  17 #include <asm/uaccess.h>
  18
  19 #include "gfs2.h"
  20 #include "lm_interface.h"
  21 #include "incore.h"
  22 #include "acl.h"
  23 #include "eaops.h"
  24 #include "eattr.h"
  25 #include "glock.h"
  26 #include "inode.h"
  27 #include "meta_io.h"
  28 #include "quota.h"
  29 #include "rgrp.h"
  30 #include "trans.h"
  31 #include "util.h"
  32
  33 /**
  34  * ea_calc_size - returns the acutal number of bytes the request will take up
  35  *                (not counting any unstuffed data blocks)
  36  * @sdp:
  37  * @er:
  38  * @size:
  39  *
  40  * Returns: 1 if the EA should be stuffed
  41  */
  42
  43 static int ea_calc_size(struct gfs2_sbd *sdp, struct gfs2_ea_request *er,
  44                         unsigned int *size)
  45 {
  46         *size = GFS2_EAREQ_SIZE_STUFFED(er);
  47         if (*size <= sdp->sd_jbsize)
  48                 return 1;
  49
  50         *size = GFS2_EAREQ_SIZE_UNSTUFFED(sdp, er);
  51
  52         return 0;
  53 }
  54
  55 static int ea_check_size(struct gfs2_sbd *sdp, struct gfs2_ea_request *er)
  56 {
  57         unsigned int size;
  58
  59         if (er->er_data_len > GFS2_EA_MAX_DATA_LEN)
  60                 return -ERANGE;
  61
  62         ea_calc_size(sdp, er, &size);
  63
  64         /* This can only happen with 512 byte blocks */
  65         if (size > sdp->sd_jbsize)
  66                 return -ERANGE;
  67
  68         return 0;
  69 }
  70
  71 typedef int (*ea_call_t) (struct gfs2_inode *ip,
  72                           struct buffer_head *bh,
  73                           struct gfs2_ea_header *ea,
  74                           struct gfs2_ea_header *prev,
  75                           void *private);
  76
  77 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  78                         ea_call_t ea_call, void *data)
  79 {
  80         struct gfs2_ea_header *ea, *prev = NULL;
  81         int error = 0;
  82
  83         if (gfs2_metatype_check(ip->i_sbd, bh, GFS2_METATYPE_EA))
  84                 return -EIO;
  85
  86         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  87                 if (!GFS2_EA_REC_LEN(ea))
  88                         goto fail;
  89                 if (!(bh->b_data <= (char *)ea &&
  90                       (char *)GFS2_EA2NEXT(ea) <=
  91                       bh->b_data + bh->b_size))
  92                         goto fail;
  93                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  94                         goto fail;
  95
  96                 error = ea_call(ip, bh, ea, prev, data);
  97                 if (error)
  98                         return error;
  99
 100                 if (GFS2_EA_IS_LAST(ea)) {
 101                         if ((char *)GFS2_EA2NEXT(ea) !=
 102                             bh->b_data + bh->b_size)
 103                                 goto fail;
 104                         break;
 105                 }
 106         }
 107
 108         return error;
 109
 110  fail:
 111         gfs2_consist_inode(ip);
 112         return -EIO;
 113 }
 114
 115 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 116 {
 117         struct buffer_head *bh, *eabh;
 118         uint64_t *eablk, *end;
 119         int error;
 120
 121         error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr,
 122                                DIO_START | DIO_WAIT, &bh);
 123         if (error)
 124                 return error;
 125
 126         if (!(ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT)) {
 127                 error = ea_foreach_i(ip, bh, ea_call, data);
 128                 goto out;
 129         }
 130
 131         if (gfs2_metatype_check(ip->i_sbd, bh, GFS2_METATYPE_IN)) {
 132                 error = -EIO;
 133                 goto out;
 134         }
 135
 136         eablk = (uint64_t *)(bh->b_data + sizeof(struct gfs2_meta_header));
 137         end = eablk + ip->i_sbd->sd_inptrs;
 138
 139         for (; eablk < end; eablk++) {
 140                 uint64_t bn;
 141
 142                 if (!*eablk)
 143                         break;
 144                 bn = be64_to_cpu(*eablk);
 145
 146                 error = gfs2_meta_read(ip->i_gl, bn, DIO_START | DIO_WAIT,
 147                                        &eabh);
 148                 if (error)
 149                         break;
 150                 error = ea_foreach_i(ip, eabh, ea_call, data);
 151                 brelse(eabh);
 152                 if (error)
 153                         break;
 154         }
 155  out:
 156         brelse(bh);
 157
 158         return error;
 159 }
 160
 161 struct ea_find {
 162         struct gfs2_ea_request *ef_er;
 163         struct gfs2_ea_location *ef_el;
 164 };
 165
 166 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 167                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 168                      void *private)
 169 {
 170         struct ea_find *ef = private;
 171         struct gfs2_ea_request *er = ef->ef_er;
 172
 173         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 174                 return 0;
 175
 176         if (ea->ea_type == er->er_type) {
 177                 if (ea->ea_name_len == er->er_name_len &&
 178                     !memcmp(GFS2_EA2NAME(ea), er->er_name, ea->ea_name_len)) {
 179                         struct gfs2_ea_location *el = ef->ef_el;
 180                         get_bh(bh);
 181                         el->el_bh = bh;
 182                         el->el_ea = ea;
 183                         el->el_prev = prev;
 184                         return 1;
 185                 }
 186         }
 187
 188 #if 0
 189         else if ((ip->i_di.di_flags & GFS2_DIF_EA_PACKED) &&
 190                  er->er_type == GFS2_EATYPE_SYS)
 191                 return 1;
 192 #endif
 193
 194         return 0;
 195 }
 196
 197 int gfs2_ea_find(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 198                  struct gfs2_ea_location *el)
 199 {
 200         struct ea_find ef;
 201         int error;
 202
 203         ef.ef_er = er;
 204         ef.ef_el = el;
 205
 206         memset(el, 0, sizeof(struct gfs2_ea_location));
 207
 208         error = ea_foreach(ip, ea_find_i, &ef);
 209         if (error > 0)
 210                 return 0;
 211
 212         return error;
 213 }
 214
 215 /**
 216  * ea_dealloc_unstuffed -
 217  * @ip:
 218  * @bh:
 219  * @ea:
 220  * @prev:
 221  * @private:
 222  *
 223  * Take advantage of the fact that all unstuffed blocks are
 224  * allocated from the same RG.  But watch, this may not always
 225  * be true.
 226  *
 227  * Returns: errno
 228  */
 229
 230 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 231                                 struct gfs2_ea_header *ea,
 232                                 struct gfs2_ea_header *prev, void *private)
 233 {
 234         int *leave = private;
 235         struct gfs2_sbd *sdp = ip->i_sbd;
 236         struct gfs2_rgrpd *rgd;
 237         struct gfs2_holder rg_gh;
 238         struct buffer_head *dibh;
 239         uint64_t *dataptrs, bn = 0;
 240         uint64_t bstart = 0;
 241         unsigned int blen = 0;
 242         unsigned int blks = 0;
 243         unsigned int x;
 244         int error;
 245
 246         if (GFS2_EA_IS_STUFFED(ea))
 247                 return 0;
 248
 249         dataptrs = GFS2_EA2DATAPTRS(ea);
 250         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++)
 251                 if (*dataptrs) {
 252                         blks++;
 253                         bn = be64_to_cpu(*dataptrs);
 254                 }
 255         if (!blks)
 256                 return 0;
 257
 258         rgd = gfs2_blk2rgrpd(sdp, bn);
 259         if (!rgd) {
 260                 gfs2_consist_inode(ip);
 261                 return -EIO;
 262         }
 263
 264         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 265         if (error)
 266                 return error;
 267
 268         error = gfs2_trans_begin(sdp, rgd->rd_ri.ri_length +
 269                                  RES_DINODE + RES_EATTR + RES_STATFS +
 270                                  RES_QUOTA, blks);
 271         if (error)
 272                 goto out_gunlock;
 273
 274         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 275
 276         dataptrs = GFS2_EA2DATAPTRS(ea);
 277         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 278                 if (!*dataptrs)
 279                         break;
 280                 bn = be64_to_cpu(*dataptrs);
 281
 282                 if (bstart + blen == bn)
 283                         blen++;
 284                 else {
 285                         if (bstart)
 286                                 gfs2_free_meta(ip, bstart, blen);
 287                         bstart = bn;
 288                         blen = 1;
 289                 }
 290
 291                 *dataptrs = 0;
 292                 if (!ip->i_di.di_blocks)
 293                         gfs2_consist_inode(ip);
 294                 ip->i_di.di_blocks--;
 295         }
 296         if (bstart)
 297                 gfs2_free_meta(ip, bstart, blen);
 298
 299         if (prev && !leave) {
 300                 uint32_t len;
 301
 302                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 303                 prev->ea_rec_len = cpu_to_be32(len);
 304
 305                 if (GFS2_EA_IS_LAST(ea))
 306                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 307         } else {
 308                 ea->ea_type = GFS2_EATYPE_UNUSED;
 309                 ea->ea_num_ptrs = 0;
 310         }
 311
 312         error = gfs2_meta_inode_buffer(ip, &dibh);
 313         if (!error) {
 314                 ip->i_di.di_ctime = get_seconds();
 315                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 316                 gfs2_dinode_out(&ip->i_di, dibh->b_data);
 317                 brelse(dibh);
 318         }
 319
 320         gfs2_trans_end(sdp);
 321
 322  out_gunlock:
 323         gfs2_glock_dq_uninit(&rg_gh);
 324
 325         return error;
 326 }
 327
 328 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 329                                struct gfs2_ea_header *ea,
 330                                struct gfs2_ea_header *prev, int leave)
 331 {
 332         struct gfs2_alloc *al;
 333         int error;
 334
 335         al = gfs2_alloc_get(ip);
 336
 337         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 338         if (error)
 339                 goto out_alloc;
 340
 341         error = gfs2_rindex_hold(ip->i_sbd, &al->al_ri_gh);
 342         if (error)
 343                 goto out_quota;
 344
 345         error = ea_dealloc_unstuffed(ip,
 346                                      bh, ea, prev,
 347                                      (leave) ? &error : NULL);
 348
 349         gfs2_glock_dq_uninit(&al->al_ri_gh);
 350
 351  out_quota:
 352         gfs2_quota_unhold(ip);
 353
 354  out_alloc:
 355         gfs2_alloc_put(ip);
 356
 357         return error;
 358 }
 359
 360 struct ea_list {
 361         struct gfs2_ea_request *ei_er;
 362         unsigned int ei_size;
 363 };
 364
 365 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 366                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 367                      void *private)
 368 {
 369         struct ea_list *ei = private;
 370         struct gfs2_ea_request *er = ei->ei_er;
 371         unsigned int ea_size = gfs2_ea_strlen(ea);
 372
 373         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 374                 return 0;
 375
 376         if (er->er_data_len) {
 377                 char *prefix;
 378                 unsigned int l;
 379                 char c = 0;
 380
 381                 if (ei->ei_size + ea_size > er->er_data_len)
 382                         return -ERANGE;
 383
 384                 switch (ea->ea_type) {
 385                 case GFS2_EATYPE_USR:
 386                         prefix = "user.";
 387                         l = 5;
 388                         break;
 389                 case GFS2_EATYPE_SYS:
 390                         prefix = "system.";
 391                         l = 7;
 392                         break;
 393                 case GFS2_EATYPE_SECURITY:
 394                         prefix = "security.";
 395                         l = 9;
 396                         break;
 397                 default:
 398                         /* FIXME: Needs looking at again */
 399                         break;
 400                 }
 401
 402                 memcpy(er->er_data + ei->ei_size, prefix, l);
 403                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 404                        ea->ea_name_len);
 405                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 406         }
 407
 408         ei->ei_size += ea_size;
 409
 410         return 0;
 411 }
 412
 413 /**
 414  * gfs2_ea_list -
 415  * @ip:
 416  * @er:
 417  *
 418  * Returns: actual size of data on success, -errno on error
 419  */
 420
 421 int gfs2_ea_list(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 422 {
 423         struct gfs2_holder i_gh;
 424         int error;
 425
 426         if (!er->er_data || !er->er_data_len) {
 427                 er->er_data = NULL;
 428                 er->er_data_len = 0;
 429         }
 430
 431         error = gfs2_glock_nq_init(ip->i_gl,
 432                                   LM_ST_SHARED, LM_FLAG_ANY,
 433                                   &i_gh);
 434         if (error)
 435                 return error;
 436
 437         if (ip->i_di.di_eattr) {
 438                 struct ea_list ei = { .ei_er = er, .ei_size = 0 };
 439
 440                 error = ea_foreach(ip, ea_list_i, &ei);
 441                 if (!error)
 442                         error = ei.ei_size;
 443         }
 444
 445         gfs2_glock_dq_uninit(&i_gh);
 446
 447         return error;
 448 }
 449
 450 /**
 451  * ea_get_unstuffed - actually copies the unstuffed data into the
 452  *                    request buffer
 453  * @ip:
 454  * @ea:
 455  * @data:
 456  *
 457  * Returns: errno
 458  */
 459
 460 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 461                             char *data)
 462 {
 463         struct gfs2_sbd *sdp = ip->i_sbd;
 464         struct buffer_head **bh;
 465         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 466         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 467         uint64_t *dataptrs = GFS2_EA2DATAPTRS(ea);
 468         unsigned int x;
 469         int error = 0;
 470
 471         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_KERNEL);
 472         if (!bh)
 473                 return -ENOMEM;
 474
 475         for (x = 0; x < nptrs; x++) {
 476                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs),
 477                                        DIO_START, bh + x);
 478                 if (error) {
 479                         while (x--)
 480                                 brelse(bh[x]);
 481                         goto out;
 482                 }
 483                 dataptrs++;
 484         }
 485
 486         for (x = 0; x < nptrs; x++) {
 487                 error = gfs2_meta_reread(sdp, bh[x], DIO_WAIT);
 488                 if (error) {
 489                         for (; x < nptrs; x++)
 490                                 brelse(bh[x]);
 491                         goto out;
 492                 }
 493                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 494                         for (; x < nptrs; x++)
 495                                 brelse(bh[x]);
 496                         error = -EIO;
 497                         goto out;
 498                 }
 499
 500                 memcpy(data,
 501                        bh[x]->b_data + sizeof(struct gfs2_meta_header),
 502                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 503
 504                 amount -= sdp->sd_jbsize;
 505                 data += sdp->sd_jbsize;
 506
 507                 brelse(bh[x]);
 508         }
 509
 510  out:
 511         kfree(bh);
 512
 513         return error;
 514 }
 515
 516 int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 517                      char *data)
 518 {
 519         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 520                 memcpy(data,
 521                        GFS2_EA2DATA(el->el_ea),
 522                        GFS2_EA_DATA_LEN(el->el_ea));
 523                 return 0;
 524         } else
 525                 return ea_get_unstuffed(ip, el->el_ea, data);
 526 }
 527
 528 /**
 529  * gfs2_ea_get_i -
 530  * @ip:
 531  * @er:
 532  *
 533  * Returns: actual size of data on success, -errno on error
 534  */
 535
 536 int gfs2_ea_get_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 537 {
 538         struct gfs2_ea_location el;
 539         int error;
 540
 541         if (!ip->i_di.di_eattr)
 542                 return -ENODATA;
 543
 544         error = gfs2_ea_find(ip, er, &el);
 545         if (error)
 546                 return error;
 547         if (!el.el_ea)
 548                 return -ENODATA;
 549
 550         if (er->er_data_len) {
 551                 if (GFS2_EA_DATA_LEN(el.el_ea) > er->er_data_len)
 552                         error =  -ERANGE;
 553                 else
 554                         error = gfs2_ea_get_copy(ip, &el, er->er_data);
 555         }
 556         if (!error)
 557                 error = GFS2_EA_DATA_LEN(el.el_ea);
 558
 559         brelse(el.el_bh);
 560
 561         return error;
 562 }
 563
 564 /**
 565  * gfs2_ea_get -
 566  * @ip:
 567  * @er:
 568  *
 569  * Returns: actual size of data on success, -errno on error
 570  */
 571
 572 int gfs2_ea_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 573 {
 574         struct gfs2_holder i_gh;
 575         int error;
 576
 577         if (!er->er_name_len ||
 578             er->er_name_len > GFS2_EA_MAX_NAME_LEN)
 579                 return -EINVAL;
 580         if (!er->er_data || !er->er_data_len) {
 581                 er->er_data = NULL;
 582                 er->er_data_len = 0;
 583         }
 584
 585         error = gfs2_glock_nq_init(ip->i_gl,
 586                                   LM_ST_SHARED, LM_FLAG_ANY,
 587                                   &i_gh);
 588         if (error)
 589                 return error;
 590
 591         error = gfs2_ea_ops[er->er_type]->eo_get(ip, er);
 592
 593         gfs2_glock_dq_uninit(&i_gh);
 594
 595         return error;
 596 }
 597
 598 /**
 599  * ea_alloc_blk - allocates a new block for extended attributes.
 600  * @ip: A pointer to the inode that's getting extended attributes
 601  * @bhp:
 602  *
 603  * Returns: errno
 604  */
 605
 606 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 607 {
 608         struct gfs2_sbd *sdp = ip->i_sbd;
 609         struct gfs2_ea_header *ea;
 610         uint64_t block;
 611
 612         block = gfs2_alloc_meta(ip);
 613
 614         *bhp = gfs2_meta_new(ip->i_gl, block);
 615         gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 616         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 617         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 618
 619         ea = GFS2_EA_BH2FIRST(*bhp);
 620         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 621         ea->ea_type = GFS2_EATYPE_UNUSED;
 622         ea->ea_flags = GFS2_EAFLAG_LAST;
 623         ea->ea_num_ptrs = 0;
 624
 625         ip->i_di.di_blocks++;
 626
 627         return 0;
 628 }
 629
 630 /**
 631  * ea_write - writes the request info to an ea, creating new blocks if
 632  *            necessary
 633  * @ip:  inode that is being modified
 634  * @ea:  the location of the new ea in a block
 635  * @er: the write request
 636  *
 637  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 638  *
 639  * returns : errno
 640  */
 641
 642 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 643                     struct gfs2_ea_request *er)
 644 {
 645         struct gfs2_sbd *sdp = ip->i_sbd;
 646
 647         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 648         ea->ea_name_len = er->er_name_len;
 649         ea->ea_type = er->er_type;
 650         ea->__pad = 0;
 651
 652         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 653
 654         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 655                 ea->ea_num_ptrs = 0;
 656                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 657         } else {
 658                 uint64_t *dataptr = GFS2_EA2DATAPTRS(ea);
 659                 const char *data = er->er_data;
 660                 unsigned int data_len = er->er_data_len;
 661                 unsigned int copy;
 662                 unsigned int x;
 663
 664                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 665                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 666                         struct buffer_head *bh;
 667                         uint64_t block;
 668                         int mh_size = sizeof(struct gfs2_meta_header);
 669
 670                         block = gfs2_alloc_meta(ip);
 671
 672                         bh = gfs2_meta_new(ip->i_gl, block);
 673                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 674                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 675
 676                         ip->i_di.di_blocks++;
 677
 678                         copy = (data_len > sdp->sd_jbsize) ? sdp->sd_jbsize :
 679                                                              data_len;
 680                         memcpy(bh->b_data + mh_size, data, copy);
 681                         if (copy < sdp->sd_jbsize)
 682                                 memset(bh->b_data + mh_size + copy, 0,
 683                                        sdp->sd_jbsize - copy);
 684
 685                         *dataptr++ = cpu_to_be64((uint64_t)bh->b_blocknr);
 686                         data += copy;
 687                         data_len -= copy;
 688
 689                         brelse(bh);
 690                 }
 691
 692                 gfs2_assert_withdraw(sdp, !data_len);
 693         }
 694
 695         return 0;
 696 }
 697
 698 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 699                                    struct gfs2_ea_request *er,
 700                                    void *private);
 701
 702 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 703                              unsigned int blks,
 704                              ea_skeleton_call_t skeleton_call,
 705                              void *private)
 706 {
 707         struct gfs2_alloc *al;
 708         struct buffer_head *dibh;
 709         int error;
 710
 711         al = gfs2_alloc_get(ip);
 712
 713         error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 714         if (error)
 715                 goto out;
 716
 717         error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
 718         if (error)
 719                 goto out_gunlock_q;
 720
 721         al->al_requested = blks;
 722
 723         error = gfs2_inplace_reserve(ip);
 724         if (error)
 725                 goto out_gunlock_q;
 726
 727         error = gfs2_trans_begin(ip->i_sbd,
 728                                  blks + al->al_rgd->rd_ri.ri_length +
 729                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 730         if (error)
 731                 goto out_ipres;
 732
 733         error = skeleton_call(ip, er, private);
 734         if (error)
 735                 goto out_end_trans;
 736
 737         error = gfs2_meta_inode_buffer(ip, &dibh);
 738         if (!error) {
 739                 if (er->er_flags & GFS2_ERF_MODE) {
 740                         gfs2_assert_withdraw(ip->i_sbd,
 741                                             (ip->i_di.di_mode & S_IFMT) ==
 742                                             (er->er_mode & S_IFMT));
 743                         ip->i_di.di_mode = er->er_mode;
 744                 }
 745                 ip->i_di.di_ctime = get_seconds();
 746                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 747                 gfs2_dinode_out(&ip->i_di, dibh->b_data);
 748                 brelse(dibh);
 749         }
 750
 751  out_end_trans:
 752         gfs2_trans_end(ip->i_sbd);
 753
 754  out_ipres:
 755         gfs2_inplace_release(ip);
 756
 757  out_gunlock_q:
 758         gfs2_quota_unlock(ip);
 759
 760  out:
 761         gfs2_alloc_put(ip);
 762
 763         return error;
 764 }
 765
 766 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 767                      void *private)
 768 {
 769         struct buffer_head *bh;
 770         int error;
 771
 772         error = ea_alloc_blk(ip, &bh);
 773         if (error)
 774                 return error;
 775
 776         ip->i_di.di_eattr = bh->b_blocknr;
 777         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 778
 779         brelse(bh);
 780
 781         return error;
 782 }
 783
 784 /**
 785  * ea_init - initializes a new eattr block
 786  * @ip:
 787  * @er:
 788  *
 789  * Returns: errno
 790  */
 791
 792 static int ea_init(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 793 {
 794         unsigned int jbsize = ip->i_sbd->sd_jbsize;
 795         unsigned int blks = 1;
 796
 797         if (GFS2_EAREQ_SIZE_STUFFED(er) > jbsize)
 798                 blks += DIV_ROUND_UP(er->er_data_len, jbsize);
 799
 800         return ea_alloc_skeleton(ip, er, blks, ea_init_i, NULL);
 801 }
 802
 803 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 804 {
 805         uint32_t ea_size = GFS2_EA_SIZE(ea);
 806         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 807                                      ea_size);
 808         uint32_t new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 809         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 810
 811         ea->ea_rec_len = cpu_to_be32(ea_size);
 812         ea->ea_flags ^= last;
 813
 814         new->ea_rec_len = cpu_to_be32(new_size);
 815         new->ea_flags = last;
 816
 817         return new;
 818 }
 819
 820 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 821                                   struct gfs2_ea_location *el)
 822 {
 823         struct gfs2_ea_header *ea = el->el_ea;
 824         struct gfs2_ea_header *prev = el->el_prev;
 825         uint32_t len;
 826
 827         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 828
 829         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 830                 ea->ea_type = GFS2_EATYPE_UNUSED;
 831                 return;
 832         } else if (GFS2_EA2NEXT(prev) != ea) {
 833                 prev = GFS2_EA2NEXT(prev);
 834                 gfs2_assert_withdraw(ip->i_sbd, GFS2_EA2NEXT(prev) == ea);
 835         }
 836
 837         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 838         prev->ea_rec_len = cpu_to_be32(len);
 839
 840         if (GFS2_EA_IS_LAST(ea))
 841                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 842 }
 843
 844 struct ea_set {
 845         int ea_split;
 846
 847         struct gfs2_ea_request *es_er;
 848         struct gfs2_ea_location *es_el;
 849
 850         struct buffer_head *es_bh;
 851         struct gfs2_ea_header *es_ea;
 852 };
 853
 854 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 855                                  struct gfs2_ea_header *ea, struct ea_set *es)
 856 {
 857         struct gfs2_ea_request *er = es->es_er;
 858         struct buffer_head *dibh;
 859         int error;
 860
 861         error = gfs2_trans_begin(ip->i_sbd, RES_DINODE + 2 * RES_EATTR, 0);
 862         if (error)
 863                 return error;
 864
 865         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 866
 867         if (es->ea_split)
 868                 ea = ea_split_ea(ea);
 869
 870         ea_write(ip, ea, er);
 871
 872         if (es->es_el)
 873                 ea_set_remove_stuffed(ip, es->es_el);
 874
 875         error = gfs2_meta_inode_buffer(ip, &dibh);
 876         if (error)
 877                 goto out;
 878
 879         if (er->er_flags & GFS2_ERF_MODE) {
 880                 gfs2_assert_withdraw(ip->i_sbd,
 881                         (ip->i_di.di_mode & S_IFMT) == (er->er_mode & S_IFMT));
 882                 ip->i_di.di_mode = er->er_mode;
 883         }
 884         ip->i_di.di_ctime = get_seconds();
 885         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 886         gfs2_dinode_out(&ip->i_di, dibh->b_data);
 887         brelse(dibh);
 888  out:
 889         gfs2_trans_end(ip->i_sbd);
 890
 891         return error;
 892 }
 893
 894 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 895                                struct gfs2_ea_request *er, void *private)
 896 {
 897         struct ea_set *es = private;
 898         struct gfs2_ea_header *ea = es->es_ea;
 899         int error;
 900
 901         gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 902
 903         if (es->ea_split)
 904                 ea = ea_split_ea(ea);
 905
 906         error = ea_write(ip, ea, er);
 907         if (error)
 908                 return error;
 909
 910         if (es->es_el)
 911                 ea_set_remove_stuffed(ip, es->es_el);
 912
 913         return 0;
 914 }
 915
 916 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 917                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 918                          void *private)
 919 {
 920         struct ea_set *es = private;
 921         unsigned int size;
 922         int stuffed;
 923         int error;
 924
 925         stuffed = ea_calc_size(ip->i_sbd, es->es_er, &size);
 926
 927         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 928                 if (GFS2_EA_REC_LEN(ea) < size)
 929                         return 0;
 930                 if (!GFS2_EA_IS_STUFFED(ea)) {
 931                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 932                         if (error)
 933                                 return error;
 934                 }
 935                 es->ea_split = 0;
 936         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 937                 es->ea_split = 1;
 938         else
 939                 return 0;
 940
 941         if (stuffed) {
 942                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 943                 if (error)
 944                         return error;
 945         } else {
 946                 unsigned int blks;
 947
 948                 es->es_bh = bh;
 949                 es->es_ea = ea;
 950                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 951                                         ip->i_sbd->sd_jbsize);
 952
 953                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 954                                           ea_set_simple_alloc, es);
 955                 if (error)
 956                         return error;
 957         }
 958
 959         return 1;
 960 }
 961
 962 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 963                         void *private)
 964 {
 965         struct gfs2_sbd *sdp = ip->i_sbd;
 966         struct buffer_head *indbh, *newbh;
 967         uint64_t *eablk;
 968         int error;
 969         int mh_size = sizeof(struct gfs2_meta_header);
 970
 971         if (ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT) {
 972                 uint64_t *end;
 973
 974                 error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr,
 975                                        DIO_START | DIO_WAIT, &indbh);
 976                 if (error)
 977                         return error;
 978
 979                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 980                         error = -EIO;
 981                         goto out;
 982                 }
 983
 984                 eablk = (uint64_t *)(indbh->b_data + mh_size);
 985                 end = eablk + sdp->sd_inptrs;
 986
 987                 for (; eablk < end; eablk++)
 988                         if (!*eablk)
 989                                 break;
 990
 991                 if (eablk == end) {
 992                         error = -ENOSPC;
 993                         goto out;
 994                 }
 995
 996                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 997         } else {
 998                 uint64_t blk;
 999
1000                 blk = gfs2_alloc_meta(ip);
1001
1002                 indbh = gfs2_meta_new(ip->i_gl, blk);
1003                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1004                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1005                 gfs2_buffer_clear_tail(indbh, mh_size);
1006
1007                 eablk = (uint64_t *)(indbh->b_data + mh_size);
1008                 *eablk = cpu_to_be64(ip->i_di.di_eattr);
1009                 ip->i_di.di_eattr = blk;
1010                 ip->i_di.di_flags |= GFS2_DIF_EA_INDIRECT;
1011                 ip->i_di.di_blocks++;
1012
1013                 eablk++;
1014         }
1015
1016         error = ea_alloc_blk(ip, &newbh);
1017         if (error)
1018                 goto out;
1019
1020         *eablk = cpu_to_be64((uint64_t)newbh->b_blocknr);
1021         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1022         brelse(newbh);
1023         if (error)
1024                 goto out;
1025
1026         if (private)
1027                 ea_set_remove_stuffed(ip, (struct gfs2_ea_location *)private);
1028
1029  out:
1030         brelse(indbh);
1031
1032         return error;
1033 }
1034
1035 static int ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
1036                     struct gfs2_ea_location *el)
1037 {
1038         struct ea_set es;
1039         unsigned int blks = 2;
1040         int error;
1041
1042         memset(&es, 0, sizeof(struct ea_set));
1043         es.es_er = er;
1044         es.es_el = el;
1045
1046         error = ea_foreach(ip, ea_set_simple, &es);
1047         if (error > 0)
1048                 return 0;
1049         if (error)
1050                 return error;
1051
1052         if (!(ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT))
1053                 blks++;
1054         if (GFS2_EAREQ_SIZE_STUFFED(er) > ip->i_sbd->sd_jbsize)
1055                 blks += DIV_ROUND_UP(er->er_data_len, ip->i_sbd->sd_jbsize);
1056
1057         return ea_alloc_skeleton(ip, er, blks, ea_set_block, el);
1058 }
1059
1060 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1061                                    struct gfs2_ea_location *el)
1062 {
1063         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1064                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1065                 gfs2_assert_withdraw(ip->i_sbd,
1066                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1067         }
1068
1069         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev,0);
1070 }
1071
1072 int gfs2_ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1073 {
1074         struct gfs2_ea_location el;
1075         int error;
1076
1077         if (!ip->i_di.di_eattr) {
1078                 if (er->er_flags & XATTR_REPLACE)
1079                         return -ENODATA;
1080                 return ea_init(ip, er);
1081         }
1082
1083         error = gfs2_ea_find(ip, er, &el);
1084         if (error)
1085                 return error;
1086
1087         if (el.el_ea) {
1088                 if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) {
1089                         brelse(el.el_bh);
1090                         return -EPERM;
1091                 }
1092
1093                 error = -EEXIST;
1094                 if (!(er->er_flags & XATTR_CREATE)) {
1095                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1096                         error = ea_set_i(ip, er, &el);
1097                         if (!error && unstuffed)
1098                                 ea_set_remove_unstuffed(ip, &el);
1099                 }
1100
1101                 brelse(el.el_bh);
1102         } else {
1103                 error = -ENODATA;
1104                 if (!(er->er_flags & XATTR_REPLACE))
1105                         error = ea_set_i(ip, er, NULL);
1106         }
1107
1108         return error;
1109 }
1110
1111 int gfs2_ea_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1112 {
1113         struct gfs2_holder i_gh;
1114         int error;
1115
1116         if (!er->er_name_len ||
1117             er->er_name_len > GFS2_EA_MAX_NAME_LEN)
1118                 return -EINVAL;
1119         if (!er->er_data || !er->er_data_len) {
1120                 er->er_data = NULL;
1121                 er->er_data_len = 0;
1122         }
1123         error = ea_check_size(ip->i_sbd, er);
1124         if (error)
1125                 return error;
1126
1127         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1128         if (error)
1129                 return error;
1130
1131         if (IS_IMMUTABLE(ip->i_vnode))
1132                 error = -EPERM;
1133         else
1134                 error = gfs2_ea_ops[er->er_type]->eo_set(ip, er);
1135
1136         gfs2_glock_dq_uninit(&i_gh);
1137
1138         return error;
1139 }
1140
1141 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1142 {
1143         struct gfs2_ea_header *ea = el->el_ea;
1144         struct gfs2_ea_header *prev = el->el_prev;
1145         struct buffer_head *dibh;
1146         int error;
1147
1148         error = gfs2_trans_begin(ip->i_sbd, RES_DINODE + RES_EATTR, 0);
1149         if (error)
1150                 return error;
1151
1152         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1153
1154         if (prev) {
1155                 uint32_t len;
1156
1157                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1158                 prev->ea_rec_len = cpu_to_be32(len);
1159
1160                 if (GFS2_EA_IS_LAST(ea))
1161                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1162         } else
1163                 ea->ea_type = GFS2_EATYPE_UNUSED;
1164
1165         error = gfs2_meta_inode_buffer(ip, &dibh);
1166         if (!error) {
1167                 ip->i_di.di_ctime = get_seconds();
1168                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1169                 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1170                 brelse(dibh);
1171         }
1172
1173         gfs2_trans_end(ip->i_sbd);
1174
1175         return error;
1176 }
1177
1178 int gfs2_ea_remove_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1179 {
1180         struct gfs2_ea_location el;
1181         int error;
1182
1183         if (!ip->i_di.di_eattr)
1184                 return -ENODATA;
1185
1186         error = gfs2_ea_find(ip, er, &el);
1187         if (error)
1188                 return error;
1189         if (!el.el_ea)
1190                 return -ENODATA;
1191
1192         if (GFS2_EA_IS_STUFFED(el.el_ea))
1193                 error = ea_remove_stuffed(ip, &el);
1194         else
1195                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev,
1196                                             0);
1197
1198         brelse(el.el_bh);
1199
1200         return error;
1201 }
1202
1203 /**
1204  * gfs2_ea_remove - sets (or creates or replaces) an extended attribute
1205  * @ip: pointer to the inode of the target file
1206  * @er: request information
1207  *
1208  * Returns: errno
1209  */
1210
1211 int gfs2_ea_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1212 {
1213         struct gfs2_holder i_gh;
1214         int error;
1215
1216         if (!er->er_name_len || er->er_name_len > GFS2_EA_MAX_NAME_LEN)
1217                 return -EINVAL;
1218
1219         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1220         if (error)
1221                 return error;
1222
1223         if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode))
1224                 error = -EPERM;
1225         else
1226                 error = gfs2_ea_ops[er->er_type]->eo_remove(ip, er);
1227
1228         gfs2_glock_dq_uninit(&i_gh);
1229
1230         return error;
1231 }
1232
1233 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1234                                   struct gfs2_ea_header *ea, char *data)
1235 {
1236         struct gfs2_sbd *sdp = ip->i_sbd;
1237         struct buffer_head **bh;
1238         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1239         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1240         uint64_t *dataptrs = GFS2_EA2DATAPTRS(ea);
1241         unsigned int x;
1242         int error;
1243
1244         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_KERNEL);
1245         if (!bh)
1246                 return -ENOMEM;
1247
1248         error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1249         if (error)
1250                 goto out;
1251
1252         for (x = 0; x < nptrs; x++) {
1253                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs),
1254                                        DIO_START, bh + x);
1255                 if (error) {
1256                         while (x--)
1257                                 brelse(bh[x]);
1258                         goto fail;
1259                 }
1260                 dataptrs++;
1261         }
1262
1263         for (x = 0; x < nptrs; x++) {
1264                 error = gfs2_meta_reread(sdp, bh[x], DIO_WAIT);
1265                 if (error) {
1266                         for (; x < nptrs; x++)
1267                                 brelse(bh[x]);
1268                         goto fail;
1269                 }
1270                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1271                         for (; x < nptrs; x++)
1272                                 brelse(bh[x]);
1273                         error = -EIO;
1274                         goto fail;
1275                 }
1276
1277                 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1278
1279                 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header),
1280                        data,
1281                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1282
1283                 amount -= sdp->sd_jbsize;
1284                 data += sdp->sd_jbsize;
1285
1286                 brelse(bh[x]);
1287         }
1288
1289  out:
1290         kfree(bh);
1291
1292         return error;
1293
1294  fail:
1295         gfs2_trans_end(sdp);
1296         kfree(bh);
1297
1298         return error;
1299 }
1300
1301 int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
1302                       struct iattr *attr, char *data)
1303 {
1304         struct buffer_head *dibh;
1305         int error;
1306
1307         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
1308                 error = gfs2_trans_begin(ip->i_sbd, RES_DINODE + RES_EATTR, 0);
1309                 if (error)
1310                         return error;
1311
1312                 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1313                 memcpy(GFS2_EA2DATA(el->el_ea),
1314                        data,
1315                        GFS2_EA_DATA_LEN(el->el_ea));
1316         } else
1317                 error = ea_acl_chmod_unstuffed(ip, el->el_ea, data);
1318
1319         if (error)
1320                 return error;
1321
1322         error = gfs2_meta_inode_buffer(ip, &dibh);
1323         if (!error) {
1324                 error = inode_setattr(ip->i_vnode, attr);
1325                 gfs2_assert_warn(ip->i_sbd, !error);
1326                 gfs2_inode_attr_out(ip);
1327                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1328                 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1329                 brelse(dibh);
1330         }
1331
1332         gfs2_trans_end(ip->i_sbd);
1333
1334         return error;
1335 }
1336
1337 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1338 {
1339         struct gfs2_sbd *sdp = ip->i_sbd;
1340         struct gfs2_rgrp_list rlist;
1341         struct buffer_head *indbh, *dibh;
1342         uint64_t *eablk, *end;
1343         unsigned int rg_blocks = 0;
1344         uint64_t bstart = 0;
1345         unsigned int blen = 0;
1346         unsigned int blks = 0;
1347         unsigned int x;
1348         int error;
1349
1350         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1351
1352         error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr,
1353                                DIO_START | DIO_WAIT, &indbh);
1354         if (error)
1355                 return error;
1356
1357         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1358                 error = -EIO;
1359                 goto out;
1360         }
1361
1362         eablk = (uint64_t *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1363         end = eablk + sdp->sd_inptrs;
1364
1365         for (; eablk < end; eablk++) {
1366                 uint64_t bn;
1367
1368                 if (!*eablk)
1369                         break;
1370                 bn = be64_to_cpu(*eablk);
1371
1372                 if (bstart + blen == bn)
1373                         blen++;
1374                 else {
1375                         if (bstart)
1376                                 gfs2_rlist_add(sdp, &rlist, bstart);
1377                         bstart = bn;
1378                         blen = 1;
1379                 }
1380                 blks++;
1381         }
1382         if (bstart)
1383                 gfs2_rlist_add(sdp, &rlist, bstart);
1384         else
1385                 goto out;
1386
1387         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);
1388
1389         for (x = 0; x < rlist.rl_rgrps; x++) {
1390                 struct gfs2_rgrpd *rgd;
1391                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1392                 rg_blocks += rgd->rd_ri.ri_length;
1393         }
1394
1395         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1396         if (error)
1397                 goto out_rlist_free;
1398
1399         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
1400                                  RES_INDIRECT + RES_STATFS +
1401                                  RES_QUOTA, blks);
1402         if (error)
1403                 goto out_gunlock;
1404
1405         gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1406
1407         eablk = (uint64_t *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1408         bstart = 0;
1409         blen = 0;
1410
1411         for (; eablk < end; eablk++) {
1412                 uint64_t bn;
1413
1414                 if (!*eablk)
1415                         break;
1416                 bn = be64_to_cpu(*eablk);
1417
1418                 if (bstart + blen == bn)
1419                         blen++;
1420                 else {
1421                         if (bstart)
1422                                 gfs2_free_meta(ip, bstart, blen);
1423                         bstart = bn;
1424                         blen = 1;
1425                 }
1426
1427                 *eablk = 0;
1428                 if (!ip->i_di.di_blocks)
1429                         gfs2_consist_inode(ip);
1430                 ip->i_di.di_blocks--;
1431         }
1432         if (bstart)
1433                 gfs2_free_meta(ip, bstart, blen);
1434
1435         ip->i_di.di_flags &= ~GFS2_DIF_EA_INDIRECT;
1436
1437         error = gfs2_meta_inode_buffer(ip, &dibh);
1438         if (!error) {
1439                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1440                 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1441                 brelse(dibh);
1442         }
1443
1444         gfs2_trans_end(sdp);
1445
1446  out_gunlock:
1447         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1448
1449  out_rlist_free:
1450         gfs2_rlist_free(&rlist);
1451
1452  out:
1453         brelse(indbh);
1454
1455         return error;
1456 }
1457
1458 static int ea_dealloc_block(struct gfs2_inode *ip)
1459 {
1460         struct gfs2_sbd *sdp = ip->i_sbd;
1461         struct gfs2_alloc *al = &ip->i_alloc;
1462         struct gfs2_rgrpd *rgd;
1463         struct buffer_head *dibh;
1464         int error;
1465
1466         rgd = gfs2_blk2rgrpd(sdp, ip->i_di.di_eattr);
1467         if (!rgd) {
1468                 gfs2_consist_inode(ip);
1469                 return -EIO;
1470         }
1471
1472         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1473                                    &al->al_rgd_gh);
1474         if (error)
1475                 return error;
1476
1477         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE +
1478                                  RES_STATFS + RES_QUOTA, 1);
1479         if (error)
1480                 goto out_gunlock;
1481
1482         gfs2_free_meta(ip, ip->i_di.di_eattr, 1);
1483
1484         ip->i_di.di_eattr = 0;
1485         if (!ip->i_di.di_blocks)
1486                 gfs2_consist_inode(ip);
1487         ip->i_di.di_blocks--;
1488
1489         error = gfs2_meta_inode_buffer(ip, &dibh);
1490         if (!error) {
1491                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1492                 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1493                 brelse(dibh);
1494         }
1495
1496         gfs2_trans_end(sdp);
1497
1498  out_gunlock:
1499         gfs2_glock_dq_uninit(&al->al_rgd_gh);
1500
1501         return error;
1502 }
1503
1504 /**
1505  * gfs2_ea_dealloc - deallocate the extended attribute fork
1506  * @ip: the inode
1507  *
1508  * Returns: errno
1509  */
1510
1511 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1512 {
1513         struct gfs2_alloc *al;
1514         int error;
1515
1516         al = gfs2_alloc_get(ip);
1517
1518         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1519         if (error)
1520                 goto out_alloc;
1521
1522         error = gfs2_rindex_hold(ip->i_sbd, &al->al_ri_gh);
1523         if (error)
1524                 goto out_quota;
1525
1526         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1527         if (error)
1528                 goto out_rindex;
1529
1530         if (ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT) {
1531                 error = ea_dealloc_indirect(ip);
1532                 if (error)
1533                         goto out_rindex;
1534         }
1535
1536         error = ea_dealloc_block(ip);
1537
1538  out_rindex:
1539         gfs2_glock_dq_uninit(&al->al_ri_gh);
1540
1541  out_quota:
1542         gfs2_quota_unhold(ip);
1543
1544  out_alloc:
1545         gfs2_alloc_put(ip);
1546
1547         return error;
1548 }
1549